Patent Grant
11981008
This application is a 35 U.S.C. 371 National Phase Entry Application from PCT/JP2020/000686, filed Jan. 10, 2020, which claims priority to Japanese Patent Application Nos. 2019-005955, filed Jan. 17, 2019, and 2019-005956, filed Jan. 17, 2019, the disclosures of which are incorporated herein in their entirety by reference, and priority is claimed to each of the foregoing.
The present invention relates to a stapler.
As for a stapler configured to bind a sheet bundle, suggested is a technology having a so-called boosting mechanism so as to reduce a required load (for example, refer to PTL 1). In a configuration of the boosting mechanism of the related art, a rate of decrease in load (boosting rate) is kept constant over an entire stroke of a handle. For this reason, an operating amount of the handle increases and a size of the device in a height direction increases.
In contrast, suggested is a stapler having a so-called variable boosting mechanism configured to enable a rate of decrease in load to vary, according to a load required for an operation, thereby suppressing an increase in operating amount of a handle (for example, refer to PTL 2).
In addition, a stapler configured to bind a sheet bundle by causing a pair of leg portions of a staple to penetrate through a sheet bundle and inwardly bending the leg portions is widely used (for example, refer to PTL 2). The stapler has, main constitutional components, a handle arm, a driver arm, a magazine, a clincher arm, and the like. The handle arm, the driver arm and the magazine are rotatably supported via a shaft portion by bearing parts provided to the clincher arm, for example.
In the stapler, grease, which is lubricant, may be applied to shaft holes of the bearing parts and the shaft portion so as to reduce the friction during rotation (sliding) between the shaft portion and the other components such as the handle arm and the like.
In the stapler having the variable boosting mechanism, since a shaft hole portion provided on the handle-side so as to change the boosting rate has a closed long hole shape and the shaft hole portion and the shaft are engaged in a state where the handle is in a standby position, a configuration where a magazine is opened by rotating the handle cannot be implemented. For this reason, a configuration of sliding the magazine toward the front of the staples is provided. As a result, the number of components increases, and the device increases in size.
In addition, the stapler having the variable boosting mechanism uses staples that are larger in size than staples called JIS No. 10 needle. On the other hand, it is desired a stapler that can use staples called JIS 10 needle to increase the number of staples to be accommodated and can be operated in the same manner as the conventional stapler.
When an amount of grease applied to the bearing part and the shaft portion is small or when the amount of applied grease is reduced as the stapler is repeatedly used, the friction (sliding resistance) between the shaft portion and another component increases, so that poor sliding may be caused. Even if it is tried to increase the amount of grease to be applied, since a diameter of the shaft hole of the bearing part and a diameter of the shaft portion are designed to be substantially the same in the stapler of the related art, the grease that can be applied to the bearing part is limited to a certain amount.
An object of the present invention is to provide a stapler where a variable boosting mechanism is provided, a magazine can be opened by rotating a handle and the number of staples called JIS No. 10 needle to be accommodated is increased.
Another object of the present invention is to provide a stapler capable of suppressing poor sliding with another component in a bearing part.
According to the present invention, provided is a stapler including: a clincher unit having a clincher part configured to bend leg portions of a staple and provided on one end portion-side; a magazine unit having a magazine in which a staple bundle consisting of staples connected to each other is loaded, and supported on the other end portion-side of the clincher unit to be rotatable about a fulcrum shaft portion as a fulcrum with respect to the clincher unit; a driver unit having a driver configured to strike out a staple from the magazine and provided on one end portion-side, the other end portion-side of the driver unit being supported to be rotatable about the fulcrum shaft portion as a fulcrum with respect to the clincher unit; a handle unit connected to the driver unit by a transmission shaft portion provided between the fulcrum shaft portion and the driver, and configured to move the driver unit toward the clincher unit for opening and closing; a camshaft portion provided to any one of the clincher unit and the handle unit; a cam groove portion provided to the other of the clincher unit and the handle unit, configured to permit the camshaft portion to enter, and having one open end portion in a direction, in which the clincher unit and the handle unit separate from each other, to enable the camshaft portion to be inserted/pulled out; and a guide portion configured to restrict a movement path of the handle unit with respect to the clincher unit in operations of opening and closing the handle unit and the driver unit with respect to the clincher unit and the magazine unit.
The cam groove portion configured to change a boosting rate has one open end portion in the direction in which the clincher unit and the handle unit separate from each other. Therefore, in operations of opening and closing the handle unit with respect to the clincher unit, the camshaft portion can be inserted/pulled out with respect to the cam groove portion. In addition, in operations of opening and closing the handle unit and the driver unit with respect to the clincher unit and the magazine, the movement path of the handle unit with respect to the clincher unit is restricted, and in an operation of closing the handle unit, the cam groove portion can be guided to the camshaft portion.
In addition, provided is a stapler including: a clincher unit having a clincher part configured to bend leg portions of a staple and provided on one end portion-side; a magazine unit having a magazine in which a staple bundle consisting of staples connected to each other is loaded, and supported on the other end portion-side of the clincher unit to be rotatable about a fulcrum shaft portion as a fulcrum with respect to the clincher unit; a driver unit having a driver configured to strike out a staple from the magazine and provided on one end portion-side, the other end portion-side of the driver unit being supported to be rotatable about the fulcrum shaft portion as a fulcrum with respect to the clincher unit; and a handle unit connected to the driver unit by a transmission shaft portion provided between the fulcrum shaft portion and the driver, and configured to move the driver unit toward the clincher unit for opening and closing; wherein the magazine unit has a pusher provided to be movable along a length direction of the magazine, a pusher spring for pressing the pusher toward a magazine front wall part of the magazine, and a pusher band having one end portion attached to the pusher and the other end portion attached to the driver unit, and configured to connect the pusher and the driver unit, and wherein in a state where the pusher is retreated by the pusher band and is moved to a most retreat position in an operation of opening the handle unit and the driver unit with respect to the clincher unit and the magazine unit, a length between an inner surface-side of the magazine front wall part and the pusher is 75 mm or longer, a length of the magazine is 90 mm or longer and 100 mm or shorter, a length of the pusher band is 51 mm or longer and 61 mm or shorter, a length from the fulcrum shaft portion to an attachment position of the pusher band to the driver unit is 41 mm or longer and 50 mm or shorter, and an entire length of the stapler is 105 mm or longer and 125 mm or shorter.
A length of a staple bundle where staples called JIS No. 10 needle are connected is about 25 mm, and three staple bundles can be loaded in the magazine.
In the stapler having a variable boosting mechanism, the staple bundle can be loaded by opening the magazine in a similar operation to the stapler of the related art for rotating a handle.
In the stapler large enough to be held and operated with a hand, the three staple bundles consisting of connected staples of JIS No. 10 needles can be loaded, so that it is possible to reduce the frequency to replace the staple bundle.
Hereinafter, a first embodiment of the present invention will be described in detail with reference to
<Configuration Example of Stapler>
First, a staple 10 is described with reference to
The staple 10 is of a standard called JIS No. 10 needle and has a thickness of about 0.5 mm, and the staple bundle 11 obtained by connecting a series of 50 standard staples has a length L of about 25 mm.
A stapler 1A, which will be described later, is a stapler that uses the staple 10 called JIS No. 10 needle and can be held and operated with a hand, has a boosting mechanism for reducing a load necessary for an operation of binding a sheet bundle, and further has a configuration called a variable boosting mechanism by which a rate of decrease in load is switched so that a load is adjusted according to the operation in each process of the operation of binding the sheet bundle.
The stapler 1A is a stapler having the variable boosting mechanism and a size that can be held and operated with a hand, and enabling staples to be loaded by opening and closing a handle unit.
The stapler 1A is also a stapler having the variable boosting mechanism and a size that can be held and operated with a hand, and enabling three staple bundles of JIS No. 10 needles to be loaded.
The stapler 1A includes a clincher unit 2, a magazine unit 3, a driver unit 4, and a handle unit 5.
The clincher unit 2 has a clincher arm 20, and a clincher arm cover 21 configured to cover the clincher arm 20.
The clincher arm 20 is formed into a predetermined shape by bending a plate-shaped metal material by, for example, punching and bending such as pressing. The clincher arm 20 has a clincher part 20a configured to bend the leg portions 10b of the staple 10 and provided on a bottom surface part 20b of a tip end-side, which is one end portion-side in an extension direction of the clincher arm 20. A groove portion of the clincher part 20a for bending the leg portions 10b of the staple 10 into a predetermined shape is formed integrally with the bottom surface part 20b of the clincher arm 20.
The clincher arm 20 has a pair of sidewall parts 20c formed by bending both side parts on a rear end-side, which is the other end portion-side in the extension direction of the clincher arm 20, in a substantially vertical direction with respect to the bottom surface part 20b.
The clincher arm 20 has fulcrum pin support portions 20d penetrating through the pair of sidewall parts 20c, in which a fulcrum pin 22 that is a fulcrum shaft portion is inserted, and provided on the other end portion-side. The fulcrum pin support portions 20d are formed as hole portions penetrating through the pair of sidewall parts 20c. The clincher arm 20 also has camshaft support portions 20e penetrating through the pair of sidewall parts 20c, in which a camshaft 23 that is a camshaft portion is inserted, and provided between the clincher part 20a and the fulcrum pin support portions 20d. The camshaft support portions 20e are formed as hole portions penetrating through the pair of sidewall parts 20c.
The clincher arm 20 also has restriction convex portions 20f configured to restrict the handle unit 5 from opening with respect to the clincher unit 2 and provided between the clincher part 20a and the camshaft support portions 20e. The restriction convex portions 20f are each constituted by providing a convex portion having a predetermined shape on an outer surface of each of the pair of sidewall parts 20c. The clincher arm 20 also has guide convex portions 20g configured to guide opening and closing of the handle unit 5 and provided between the fulcrum pin support portions 20d and the camshaft support portions 20e. The guide convex portions 20g are an example of the guide portion, and are each constituted by providing a convex portion having a circular column shape on the outer surface of each of the pair of sidewall parts 20c.
The clincher arm cover 21 is made of resin and has a shape covering the bottom surface part 20b and the pair of sidewall parts 20c of the clincher arm 20.
The magazine unit 3 has a magazine 30 in which the staples 10 are loaded, a pusher 31 configured to press the staples 10 loaded in the magazine 30 in a wire width direction orthogonal to the crown portion 10a, a pusher guide 32 configured to guide movement of the pusher 31, a pusher spring 33 for urging the pusher 31, a pusher band 34 configured to move the pusher 31 by opening and closing of the handle unit 5, and a magazine return spring 35 for urging the magazine unit 3 away from the clincher unit 2.
The magazine 30 is formed into a predetermined shape by bending a plate-shaped metal material by, for example, punching and bending such as pressing, and has a space which the staples 10 can be loaded therein and has an opened top surface. Specifically, the magazine 30 has a pair of magazine sidewall parts 30a formed by bending both side parts of the magazine bottom surface part in a substantially vertical direction toward one direction, and erected from both side parts of the magazine bottom surface part.
The magazine 30 is configured such that an inner width of the facing magazine sidewall parts 30a is substantially the same as an outer width of the crown portion 10a of the staple 10 to the extent that the staple bundle 11 can be inserted, the staples 10 can be loaded between the facing magazine sidewall parts 30a and positions of the loaded staples 10 in a width direction are restricted.
The magazine 30 has a magazine front wall part 30b formed by bending inwardly tip ends of the pair of magazine sidewall parts 30a, which are one end portions in a length direction of the magazine 30, in such an aspect of blocking tip ends of the facing magazine sidewall parts 30a, and a lower portion of the magazine front wall part 30b is provided with an opening portion 30c having a size through which the staple 10 separated into one piece can pass.
The magazine 30 has fulcrum pin support portions 30d penetrating through the pair of magazine sidewall parts 30a, in which the fulcrum pin 22 is inserted, and provided on a rear end-side, which is one end portion-side in the length direction of the magazine 30. The fulcrum pin support portions 30d are formed as hole portions penetrating through the pair of magazine sidewall parts 30a.
The pusher 31 is made of a resin material such as plastic, and has pressing portions 31a for pressing against the staple 10, a pusher spring engaging portion 31b to which the pusher spring 33 is engaged, and a band engaging portion (not shown) to which the pusher band 34 is engaged. The pressing portions 31a have such a shape of protruding forward from both left and right sides on a tip end-side of the pusher 31 facing the magazine front wall part 30b, and are configured to press against the two leg portions 10b of the staple 10. The pusher spring engaging portion 31b is constituted by providing an inner side of one side surface of the pusher 31 with a projection to which one end portion of the pusher spring 33 is hooked.
The pusher guide 32 is made of a resin material such as plastic, and extends in the length direction of the magazine 30. A width of the pusher guide 32 in the width direction is made smaller than an inner width of the crown portion 10a of the staple 10, so that a space in which the leg portions 10b of the staple 10 can be inserted is provided between the pusher guide 32 and the magazine sidewall parts 30a.
The pusher guide 32 has a staple guide portion 32a configured to press the staple 10 separated into one piece against the magazine front wall part 30b. The staple guide portion 32a has a width slightly smaller than the inner width of the crown portion 10a of the staple 10, and is provided integrally with the tip end-side of the pusher guide 32 with facing the magazine front wall part 30b of the magazine 30.
The pusher guide 32 has a pusher spring guide portion 32b configured to guide the pusher spring 33, and a pusher spring engaging portion 32c to which the pusher spring 33 is engaged. The pusher spring guide portion 32b is constituted by providing a bottom surface-side of the pusher guide 32 with a convex portion for folding the pusher spring 33 into a U-shape on the tip end-side of the pusher guide 32. The pusher spring engaging portion 32c is constituted by providing one inner surface of the rear end-side of the pusher guide 32 with a projection to which the other end portion of the pusher spring 33 is hooked.
The pusher guide 32 also has a restriction portion 32d configured to restrict the magazine unit 3 from opening with respect to the clincher unit 2. The restriction portion 32d is constituted by providing a convex portion, which protrudes from the magazine bottom surface part toward the clincher unit 2 when the pusher guide 32 is attached to the magazine 30, with a long hole which the camshaft 23 can be inserted therein and has a shape extending along the moving direction of the magazine unit 3 with respect to the clincher unit 2.
The pusher spring 33 is constituted by a tension coil spring. The pusher spring 33 is engaged at one end portion with the pusher spring engaging portion 31b of the pusher 31. The pusher spring 33 is folded into a U-shape at an intermediate portion by the pusher spring guide portion 32b on the tip end-side of the pusher guide 32. The pusher spring 33 is also engaged at the other end portion with the pusher spring engaging portion 32c of the pusher guide 32. Thereby, the pusher spring 33 is extended during an operation of moving the pusher 31 toward the rear end-side of the magazine 30, and the pusher 31 is pressed toward the tip end of the magazine 30 by the contraction force of the pusher spring 33.
The pusher band 34 is made of a tape-shaped resin material, and is attached at one end portion to the pusher 31.
The magazine return spring 35 is constituted by a compression coil spring, and is attached between the magazine unit 3 and the clincher unit 2.
In the magazine unit 3, the pusher 31 and the pusher spring 33 are incorporated to the pusher guide 32 as described above, and the pusher guide 32 having the pusher 31 and the pusher spring 33 incorporated thereto is attached to an inner side of the magazine 30.
In the magazine unit 3, movement of the pusher 31 is guided by the pusher guide 32. In a state where the pusher 31 is retreated due to an operation of loading or taking out the staple bundle 11 with respect to the magazine 30, the staples 10 loaded in the magazine 30 are guided by the pusher guide 32, and particularly, the staples 10 whose remaining number is small are prevented from falling down. In addition, the staple 10 that is separated into one piece and struck out is guided by the staple guide portion 32a of the pusher guide 32.
The fulcrum pin 22 inserted in the fulcrum pin support portions 20d of the clincher arm 20 is inserted into the fulcrum pin support portions 30d of the magazine 30, so that the magazine unit 3 is attached to the clincher unit 2. Also, the camshaft 23 inserted in the camshaft support portions 20e of the clincher arm 20 is inserted into the restriction portion 32d protruding from the magazine bottom surface part of the magazine 30. The magazine return spring 35 is attached with being compressed by a predetermined amount between the magazine bottom surface part of the magazine 30 and the bottom surface part 20b of the clincher arm 20.
Thereby, the magazine unit 3 can rotate about the fulcrum pin 22 as a fulcrum axis with respect to the clincher unit 2. When the magazine unit 3 rotates toward the clincher unit 2, the magazine return spring 35 is compressed. In an operation where the magazine unit 3 rotates away from the clincher unit 2 as the compressed magazine return spring 35 is restored, a rotatable range of the magazine unit 3 is restricted by the restriction portion 32d in which the camshaft 23 is inserted, and a predetermined space is secured between the magazine 30 and the clincher part 20a.
The driver unit 4 has a driver arm 40, the driver arm return spring 41, a driver 42, and a staple cover 43.
The driver arm 40 is formed into a predetermined shape by bending a plate-shaped metal material by, for example, punching and bending such as pressing. The driver arm 40 has a pair of sidewall parts 40b formed by bending both side parts of a top surface part 40a in a substantially vertical direction with respect to the top surface part 40a.
The driver 42 configured to separate the staples 10 loaded in the magazine 30 into one staple and to strike out the same is attached to the top surface part 40a on a tip end-side of the driver arm 40, which is one end portion-side in an extension direction of the driver arm 40. The driver 42 has substantially the same width as an outer width of the crown portion 10a of the staple 10, and has substantially the same plate thickness as the wire width of the staple 10.
The driver arm 40 also has fulcrum pin support portions 40c penetrating through the pair of sidewall parts 40b, in which the fulcrum pin 22 is inserted, and provided on a rear end-side that is the other end portion-side in the extension direction of the driver arm 40. The fulcrum pin support portions 40c are formed as hole portions penetrating through the pair of sidewall parts 40b.
The driver arm 40 also has boosting pin support portions 40d, in which a boosting pin 6 that is the transmission shaft portion is inserted, provided between the fulcrum pin support portions 40c and the driver 42. The boosting pin support portions 40d are formed as hole portions penetrating through the pair of sidewall parts 40b.
The staple cover 43 is formed into a predetermined shape by bending a plate-shaped metal material by, for example, punching and bending such as pressing. The staple cover 43 has a magazine/driver engaging portion 43a configured to engage with the driver 42 and the magazine front wall part 30b of the magazine 30 and provided on a top surface part 43b on a tip end-side, which is one end portion-side in an extension direction of the staple cover 43. The staple cover 43 also has a pair of sidewall parts 43c formed by bending both side parts of the top surface part 43b in a substantially vertical direction with respect to the top surface part 43b.
The staple cover 43 has fulcrum pin support portions 43d configured to support the fulcrum pin 22 and provided on a rear end-side that is the other end portion-side in the extension direction of the staple cover 43. The fulcrum pin support portions 43d are constituted by concave portions provided to the pair of sidewall parts 43c. The staple cover 43 also has an opening portion 43e, through which the pusher band 34 passes, provided between the magazine/driver engaging portion 43a and the fulcrum pin support portions 43d. The staple cover 43 also has a mounting portion 43f configured to engage with the pusher band 34 and the driver arm return spring 41 and provided between the magazine/driver engaging portion 43a and the opening portion 43e.
The driver arm return spring 41 is constituted by a compression coil spring and is engaged at one end portion with the mounting portion 43f provided on the top surface part 40a of the driver arm 40, so that it is attached between the top surface part 40a and the top surface part 43b of the staple cover 43.
The fulcrum pin 22 inserted in the fulcrum pin support portions 20d of the clincher arm 20 and the fulcrum pin support portions 30d of the magazine 30 is inserted into the fulcrum pin support portions 40c of the driver arm 40, so that the driver unit 4 is attached to the clincher unit 2. The magazine/driver engaging portion 43a of the staple cover 43 is engaged to the driver 42 and the fulcrum pin support portions 43d of the staple cover 43 are supported by the fulcrum pin 22. The driver arm return spring 41 is attached with being compressed by a predetermined amount between the top surface part 40a of the driver arm 40 and the top surface part 43b of the staple cover 43. Also, one end portion of the pusher band 34 is attached to the pusher 31, and the other end portion of the pusher band 34 is attached to the mounting portion 43f through the opening portion 43e.
Thereby, the driver unit 4 can rotate about the fulcrum pin 22 as a fulcrum axis with respect to the clincher unit 2 and the magazine unit 3. When the driver unit 4 rotates away from the magazine unit 3, the pusher band 34 pulls the pusher 31, so that the pusher 31 is guided by the pusher guide 32 and is moved to the rear end-side of the magazine 30. Thereby, a space in which the staples 10 can be loaded is formed between the inner surface-side of the magazine front wall part 30b and the pusher 31.
When the driver unit 4 rotates toward the magazine unit 3, the pusher 31 is moved toward the tip end-side of the magazine 30 by the pusher spring 33. In a case where the staples 10 are loaded in the magazine 30, the staples 10 are pressed against the magazine front wall part 30b by the pusher 31.
When the driver unit 4 rotates toward the magazine unit 3, the magazine/driver engaging portion 43a is engaged to the magazine front wall part 30b of the magazine 30. When the driver unit 4 further rotates toward the magazine unit 3, the driver 42 protrudes into the magazine 30 along the inner surface-side of the magazine front wall part 30b and the driver arm return spring 41 is compressed.
In the operation in which the driver unit 4 rotates away from the magazine unit 3 as the compressed driver arm return spring 41 is restored, the driver 42 is retreated from the magazine 30. A range of the drive 4 that can rotate as the compressed driver arm return spring 41 is restored is restricted as the driver 42 is engaged to the magazine/driver engaging portion 43a.
The handle unit 5 has a handle arm 50, and a handle arm cover 51. The handle arm 50 is formed into a predetermined shape by bending a plate-shaped metal material by, for example, punching and bending such as pressing.
The handle arm 50 has a pair of sidewall parts 50b formed by bending both side parts of a top surface part 50a in a substantially vertical direction with respect to the top surface part 50a. The handle arm 50 has boosting pin support portions 50c penetrating through the pair of sidewall parts 50b, in which the boosting pin 6 is inserted, and provided on a rear end-side that is the other end portion-side in an extension direction of the handle arm 50. The boosting pin support portions 50c are formed as hole portions penetrating through the pair of sidewall parts 50b.
The handle arm 50 also has cam groove portions 50d penetrating through the pair of sidewall parts 50b, in which the camshaft 23 is inserted, and provided on the rear end-side. The cam groove portions 50d are constituted by groove portions penetrating through the pair of sidewall parts 50b and each having an open end portion on the clincher unit 2-side, which is one end portion along a direction in which the clincher unit 2 and the handle unit 5 separate from each other.
The handle arm 50 also has restriction concave portions 50e in which the restriction convex portions 20f of the clincher arm 20 are inserted. The restriction concave portions 50e are constituted by rectangular openings penetrating through the pair of sidewall parts 50b and long along the moving direction of the handle unit 5 with respect to the clincher unit 2.
The handle arm cover 51 is made of resin, and has a shape covering the top surface part 50a and the pair of sidewall parts 50b of the handle arm 50. The handle arm cover 51 has guide concave portions 51a in which the guide convex portions 20g of the clincher arm 20 are inserted. The guide concave portions 51a are an example of the guide portion, and are constituted by providing an inner surface of the handle arm cover 51 with groove portions for guiding the handle unit 5 in an operation of opening and closing the handle unit 5 with respect to the clincher unit 2. Note that, the groove portion forming the guide concave portion may be provided on the handle arm 50.
The handle arm 50 can be regarded as a rotation operation when the handle arm 50 is moved, due to a shape of the cam groove portion 50d that is guided by the camshaft 23 and a locus on which the boosting pin 6 can move. A virtual fulcrum axis when displacement of the handle arm 50 is regarded as a rotation operation is formed on the rear end-side of the handle arm 50. The handle arm 50 is displaced by a rotation operation about the virtual fulcrum axis as a fulcrum, thereby pressing against the driver arm 40 via the boosting pin 6.
In the handle arm 50, a contact angle between the cam groove portion 50d and the camshaft 23 is changed according to the rotation operation of the handle arm 50. Thereby, a direction in which the cam groove portion 50d is guided by the camshaft 23 is changed and the virtual fulcrum axis of the rotation operation of the handle arm 50 is moved.
For this reason, for the cam groove portion 50d, sections in which the contact angle with the camshaft 23 is made different according to portions to which the camshaft 23 changing due to the rotation operation of the handle arm 50 is contacted are set. In the present example, the cam groove portion 50d has a predetermined groove shape where two sections of a first section 50d(1) and a second section 50d(2) are combined.
The handle arm 50 and the driver arm 40 are rotatably connected at the rear end-side of the handle arm 50 and at the rear end-side of the driver arm 40 by the boosting pin 6.
The boosting pin 6, which is a connecting portion of the handle arm 50 and the driver arm 40, is provided in front of the fulcrum pin 22 for supporting the rear end-side of the driver arm 40 to the clincher arm 20, and a locus on which the boosting pin 6 can move is an arc whose center is the fulcrum pin 22.
Thereby, in the handle arm 50, the tip end-side of the handle unit 5 becomes a force point to which force is applied by the user, the boosting pin 6, which is a connecting portion with the driver arm 40, becomes an action point of force to the driver arm 40, and the virtual fulcrum axis becomes a fulcrum of the rotation operation.
In the driver arm 40, the boosting pin 6, which is a connecting portion with the handle arm 50, becomes a force point to which force is applied by the handle arm 50, the driver 42 becomes an action point of force to the staple 10, and the fulcrum pin 22 becomes a fulcrum of the rotation operation.
The handle unit 5 connected to the driver unit 4 by the boosting pin 6 causes the driver unit 4 to move toward and away from the clincher unit 2 for opening and closing. The handle unit 5 and the driver unit 4 implement a boosting mechanism for reducing a load applied to the handle arm 50 by ratios of distances between the force points and action points and the fulcrums in the handle arm 50 and the driver arm 40.
In the handle arm 50, the contact angle between the cam groove portion 50d and the camshaft 23 is changed according to the rotation operation of the handle arm 50, thereby changing a direction in which the cam groove portion 50d is guided by the camshaft 23 and moving the virtual fulcrum axis of the rotation operation of the handle arm 50. Thereby, a variable boosting mechanism for changing a rate of decrease in load applied to the handle arm 50 is implemented.
In the present example, the load that is applied to the handle unit 5 is changed in an operation of sandwiching a sheet bundle between the clincher part 20a of the clincher unit 2 and the magazine 30 of the magazine unit and in an operation of causing the staple 10 to penetrate through and to bind the sheet bundle.
<Example of Operational Effects of Stapler>
From a standby state shown in
In an operation in which the handle unit 5, the driver unit 4 and the magazine unit 3 are moved from the standby state shown in
From the state where the sheet bundle is sandwiched between the clincher part 20a of the clincher unit 2 and the magazine 30 of the magazine unit 3, when the force of further pressing the tip end-side of the handle arm cover 51 of the handle unit 5 toward the clincher unit 2 is applied, the movement of the magazine unit 3 is restricted by the sheet bundle, and the driver unit 4 is moved toward the magazine unit 3.
When the driver unit 4 is moved toward the magazine unit 3, the driver 42 protrudes into the magazine 30 along the inner surface-side of the magazine front wall part 30b. Thereby, one staple 10 at the most tip of the staple bundle 11 loaded in the magazine 30 is separated from the staple bundle 11 and is struck out from the magazine 30. The pair of leg portions 10b of the staple 10 struck out from the magazine 30 is caused to penetrate through the sheet bundle and is inwardly bent by the clincher part 20a, so that the sheet bundle is bound.
In an operation in which the handle unit 5 and the driver unit 4 are moved from the state shown in
Thereby, in the operation of sandwiching the sheet bundle between the clincher part 20a of the clincher unit 2 and the magazine 30 of the magazine unit 3, a moving amount of the handle arm 50 and a moving amount of the driver arm 40 are close to each other. For this reason, the rate of decrease in load is reduced but an increase in operating amount of the handle unit 5 is suppressed. Therefore, in the standby state shown in
On the other hand, in the operation of causing the staple 10 to penetrate through and to bind the sheet bundle, the moving amount of the handle arm 50 increases with respect to the moving amount of the driver arm 40, but the rate of decrease in load increases, so that the load applied to the handle arm 50 is reduced.
In the operation of sandwiching the sheet bundle between the clincher part 20a of the clincher unit 2 and the magazine 30 of the magazine unit 3, the load that is applied to the handle unit 5 is a reaction force to the force of pressing the magazine return spring 35. For this reason, even when the rate of decrease in load is reduced, a load that is applied to an operator is not so high. On the other hand, in the operation of binding the sheet bundle, since the leg portions 10b of the staple 10 are caused to penetrate through the sheet bundle and the leg portions 10b are bent, the load that is applied to the handle unit 5 increases. Therefore, in the operation of causing the staple 10 to penetrate through and to bind the sheet bundle, the rate of decrease in load is increased to reduce the load that is applied to the handle arm 50, thereby reducing the load on the operator.
From the standby state shown in
When the tip end-side of the handle unit 5 is moved away from the clincher unit 2, the driver unit 4 connected to the handle unit 5 by the boosting pin 6 is moved away from the magazine unit 3 by the rotation operation about the fulcrum pin 22 as a fulcrum. When the driver unit 4 is moved away from the magazine unit 3, the pusher band 34 pulls the pusher 31, so that the pusher 31 is guided by the pusher guide 32 and is moved toward the rear end-side of the magazine 30, as shown in
When the handle unit 5 and the driver unit 4 are moved from a state shown in
As shown in
As shown in
When the driver unit 4 is moved in the direction of erecting with respect to the clincher unit 2 and the magazine unit 3, the pusher 31 is moved toward the tip end-side of the magazine 30 by the pusher spring 33.
As shown in
When the handle unit 5 is moved toward the clincher unit 2 and the magazine unit 3, the driver unit 4 connected to the handle unit 5 by the boosting pin 6 is moved toward the clincher unit 2 and the magazine unit 3 by the rotation operation about the fulcrum pin 22 as a fulcrum.
When the driver unit 4 is moved toward the clincher unit 2 and the magazine unit 3, the pusher 31 is moved toward the tip end-side of the magazine 30 by the pusher spring 33. In a case where the staples 10 are loaded in the magazine 30, the staples 10 are pressed against the magazine front wall part 30b by the pusher 31.
When the handle unit 5 is further moved toward the clincher unit 2, the guide concave portions 51a of the handle unit 5 are guided by the guide convex portions 20g of the clincher unit 2, so that the handle unit 5 is moved toward the clincher unit 2 and the magazine unit 3 in the state where the movement path of the handle unit 5 is restricted. Thereby, the cam groove portions 50d of the handle unit 5 enter the camshaft 23. In addition, the restriction concave portions 50e of the handle unit 5 are fitted with the restriction convex portions 20f of the clincher unit 2.
The stapler 1A having the variable boosting mechanism has a configuration of changing the contact angle between the cam groove portion 50d and the camshaft 23 according to the rotation operation of the handle arm 50, thereby moving the virtual fulcrum axis of the rotation operation of the handle arm 50. The cam groove portions 50d are each constituted by the groove portion having an open end portion on the clincher unit 2-side, so that when the handle unit 5 is moved away from the clincher unit 2, the cam groove portions 50d separate from the camshaft 23. Therefore, the handle unit 5 and the driver unit 4 can be opened with respect to the clincher unit 2 and the magazine unit 3.
In the meantime, the handle unit 5 has a configuration where the handle arm 50 is connected to the driver arm 40 of the driver unit 4 by the boosting pin 6 and can rotate about the boosting pin 6 as a fulcrum with respect to the driver unit 4.
For this reason, during the operation of moving the handle unit 5 toward the clincher unit 2 from the state where the handle unit 5 and the driver unit 4 are opened with respect to the clincher unit 2 and the magazine unit 3, if a direction of the handle unit 5 is not set, it is difficult to put the cam groove portions 50d of the handle unit 5 into the camshaft 23.
Therefore, the guide concave portions 51a provided to the handle unit 5 are caused to be guided by the guide convex portions 20g provided to the clincher unit 2, so that the movement path of the handle unit 5 can be restricted. Thereby, during the operation of moving the handle unit 5 toward the clincher unit 2 and the magazine unit 3, the cam groove portions 50d of the handle unit 5 can be put into the camshaft 23. Therefore, according to the stapler 1A having the variable boosting mechanism, the top surface-side of the magazine 30 is opened in the operation of opening and closing the handle unit 5, so that the staple bundle 11 can be loaded. Therefore, it is not necessary to provide a mechanism for sliding the magazine, for example, so that it is possible to simplify the structure and to save the cost.
A length L of the staple bundle 11 where the staples 10 called JIS No. 10 needle are connected to each other is about 25 mm. For this reason, in order to load the three staple bundles 11 in the magazine 30, it is necessary to secure a length of 75 mm or longer between the inner surface-side of the magazine front wall part 30b and the pusher 31 in a state where the pusher 31 is moved to the most retreat position, as shown in
Therefore, as shown in
In addition, as shown in
In addition, a ratio (L1:L2) of the length L1 of the magazine 30 and the length L2 of the pusher band 34 is set to 10:5.7 to 6.1. Further, a ratio (L1:L3) of the length L1 of the magazine 30 and the length L3 from the fulcrum pin 22 to the attachment position of the pusher band 34 to the driver unit 4 is set to 10:4.6 to 5.0.
In order to make the stapler 1A large enough to be held and operated with a hand, a length L4 of the stapler 1A is set to 105 mm or longer and 125 mm or shorter. The length of the stapler 1A is a length from the tip end of the clincher arm cover 21 of the clincher unit 2 to the rear end of the handle arm cover 51 of the handle unit 5, in the stapler 1A in the standby state, as shown in
Thereby, in the stapler 1A large enough to be held and operated with a hand, the three staple bundles 11 of JIS No. 10 needle can be loaded in the magazine 30. Therefore, it is possible to reduce the frequency to load the staple bundle 11. Further, even when the moving amount of the pusher 31 in the operation of opening and closing the handle unit 5 is equal to or greater than a length of the three staple bundles 11 of JIS No. 10 needle, the movement of the pusher 31 in the operation of opening and closing the handle unit 5 is not hindered.
In the stapler 1A large enough to be held and operated with a hand where the three staple bundles 11 of JIS No. 10 needle can be loaded in the magazine 30, the variable boosting mechanism is provided, so that the rate of decrease in load can be switched so that a load is adjusted according to the operation in each process of the operation of binding the sheet bundle. In addition, the variable boosting mechanism is provided, so that it is possible to reduce a size between the clincher unit 2 and the handle unit 5, as compared to a stapler where the boosting mechanism is provided but the variable boosting mechanism is not provided. Further, it is possible to load the staple bundle 11 in the magazine 30 by opening and closing the handle unit 5.
Further, the stapler 1A is usually used in such an aspect that a thumb is put on the tip end-side of the stapler 1A, which is a striking-side of the staple 10. On the other hand, in actual use circumstances, contrary to normal, in many cases, the stapler 1A is used in a reverse holding aspect that the stapler 1A is gripped with the rear end-side of the stapler 1A facing up and the striking-side of the staple 10 facing down and the thumb is touched on the rear end-side of the handle unit 5. Therefore, as shown in
In the below, a second embodiment of the present invention is described in detail with reference to
[Configuration Example of Stapler 1100A]
As shown in
Note that, in the present embodiment, the clincher unit 1010-side is referred to as a lower side of the stapler 1100A, and the handle unit 1050-side opposite to the lower side is referred to as an upper side of the stapler 1100A. Also, the driver 1044-side provided to the driver unit 1040 is referred to as a front side of the stapler 1100A, and an opposite side is referred to as a rear side of the stapler 1100A.
[Configuration Example of Clincher Unit 1010]
The clincher unit 1010 has a clincher arm 1012 configured to bend inwardly the leg portions of the staple penetrating through the sheet bundle, and a clincher cover 1014 for protecting the clincher arm 1012.
As shown in
At the rear of the center of the base part 1120, an opening portion 1120a that can be fitted with a convex portion 1142 (which will be described later) formed on the clincher cover 1014 is formed.
The bearing parts 1122 and 1124 are formed at rear end portions with shaft holes 1122c and 1124c for supporting the fulcrum pin 1062. The bearing parts 1122 and 1124 are formed with support portions 1122d and 1124d for rotatably supporting the handle cover 1054 slightly in front of the shaft holes 1122c and 1124c. The support portions 1122d and 1124d are formed to annularly protrude from outer surfaces of the bearing parts 1122 and 1124. The bearing parts 1122 and 1124 are formed at the substantially central portions with shaft holes 1122a and 1124a (refer to
The clincher arm 1012 also has a clincher groove portion 1126, and a remover 1128.
As shown in
The remover 1128 is provided at the rear end portion of the base part 1120, and protrudes outward from the rear end-side of the clincher cover 1014. The remover 1128 is tapered rearward, as seen from a side, and is configured to be inserted between the crown portion of the staple and the sheet bundle to remove the staple from the sheet bundle.
As shown in
[Configuration Example of Magazine Unit 1020]
The magazine unit 1020 has a pusher spring 1024, a pusher guide 1026, a pusher 1028 and a pusher band 1030, in addition to a magazine 1022 in which the staples are loaded.
As shown in
Rear end portions of sidewall parts 1222 and 1224 constituting the magazine 1022 are formed with shaft holes 1222a and 1224a. In the shaft holes 1222a and 1224a, the fulcrum pin 1062 supported by the bearing parts 1122 and 1124 of the clincher arm 1012 is inserted. Thereby, the magazine 1022 can rotate relative to the clincher arm 1012 about the fulcrum pin 1062 as a fulcrum of the clincher arm 1012.
As shown in
As shown in
As shown in
As shown in
By the above configuration, the pusher 1028 is pressed toward the striking-out opening 1200 by the pusher spring 1024, thereby urging the staples loaded in the magazine 1022 toward the striking-out opening 1200 and moving the staples toward the striking-out opening 1200.
As shown in
As shown in
As shown in
[Configuration Example of Driver Unit 1040]
The driver unit 1040 has a driver arm 1042 configured to be displaced in a rotation operation by receiving force from the handle unit 1050 at the boosting pin 1064, and a driver 1044 configured to press the leading staple loaded in the magazine 1022 by rotation of the driver arm 1042 and to cause the staple to penetrate through the sheet bundle.
The driver arm 1042 is arranged between an inner surface of the clincher arm 1012 and an outer surface of the magazine 1022, and is rotatably attached to the bearing parts 1122 and 1124 of the clincher arm 1012.
As shown in
As shown in
As shown in
[Configuration Example of Handle Unit 1050]
The handle unit 1050 has a handle arm 1052 configured to press the driver arm 1042, and a handle cover 1054 for protecting the handle arm 1052.
As shown in
The boosting pin 1064 is inserted in rear parts of the side surface parts 1522 and 1524 of the handle arm 1052, so that the handle arm 1052 is rotatably supported via the boosting pin 1064 by the driver arm 1042. The boosting pin 1064 is provided in front of the fulcrum pin 1062.
A downwardly protruding portion from the rear part of the side surface part 1522 is formed with a cam groove (guide portion) 1056 that can slide on the camshaft 1060 of the clincher arm 1012. The cam groove 1056 is opened on a lower end-side. Thereby, in the opening operation of the handle unit 1050, the cam groove 1056 of the handle arm 1052 separates from the camshaft 1060, so that the upper side of the magazine 1022 is opened and the staples can be thus loaded from the upper side of the magazine 1022. Note that, although not shown in
As shown in
A groove-shaped guide portion 1540 configured to slidably engage to the support portion 1122d of the clincher arm 1012 is formed on an inner side of a side surface of the rear part of the handle cover 1054. Note that, in
[Description of Variable Boosting Mechanism]
Subsequently, the variable boosting mechanism of the stapler 1100A according to the present embodiment is described with reference to
In the present embodiment, the handle arm 1052 can be regarded as a rotation operation when the handle arm 1052 is moved, due to a locus on which the boosting pin 1064 can move as the force is applied to the front end-side of the handle unit 1050 and a shape of the cam groove portion 1056 guided by the camshaft 1060. In the case of this condition, a fulcrum axis O that is a virtual rotation fulcrum when displacement of the handle arm 1052 is regarded as a rotation operation is formed on the rear end-side of the handle arm 1052. The handle arm 1052 is displaced in the rotation operation about the fulcrum axis O (shown with ‘+’ in
In the handle arm 1052, based on a pressing operation on the handle unit 1050, a contact angle between the cam groove 1056 and the camshaft 1060 is changed according to the rotation operation of the handle arm 1052, thereby changing a contact direction with the cam groove 1056 and the camshaft 1060 to move the fulcrum axis O of the rotation operation of the handle arm 1052.
As a means for moving the fulcrum axis O, for the cam groove 1056, three sections are set according to the contact angle with the camshaft 1060 during the rotation operation of the handle arm 1052. More specifically, the cam groove 1056 has a predetermined long hole shape where three sections of a first section 1056(1001), a second section 1056(1002) and a third section 1056(1003) are combined.
The first section 1056(1001) of the cam groove 1056 is a section that is in contact with the camshaft 1060 when the stapler 1100A is in the standby state, is positioned at a lower end portion of the cam groove 1056, and is inclined in a direction in which the contact angle with the camshaft 1060 is substantially orthogonal to the horizontal direction.
The second section 1056(1002) of the cam groove 1056 is a section that is in contact with the camshaft 1060 when the stapler 1100A is switched from the standby state to a boosting state and is continuous to an upper side of the first section 1056(1001), and the contact angle with the camshaft 1060 is slightly inclined in the horizontal direction with respect to the first section 1056(1001).
The third section 1056(1003) of the cam groove 1056 is a section that is in contact with the camshaft 1060 when a clinch operation of the stapler 1100A is completed and is continuous to an upper side of the second section 1056(1002), and the contact angle with the camshaft 1060 is further inclined in the horizontal direction than the second section 1056(1002).
The boosting pin 1064 is provided in front of the fulcrum pin 1062 for supporting the driver arm 1042. The locus on which the boosting pin 1064 can move is an arc whose center is the fulcrum pin 1062.
By the above configuration, as shown in
Also, in the stapler 1100A, the boosting pin 1064, which is a connecting portion of the driver arm 1042 and the handle arm 1052, becomes a force point E3 to which force is applied by the handle arm 1052, the driver 1044 becomes an action point E4 of force to the staple, and the fulcrum pin 1062 becomes a fulcrum of the rotation operation.
The handle unit 1050 and the driver unit 1040 implement a variable boosting mechanism for reducing a load F applied to the handle arm 1052 by ratios of distances between the force points and action points and the fulcrums in the handle arm 1052 and the driver arm 1042. The rate D(%) of decrease in load F applied to the handle arm 1052 is obtained by the following equation (1).
Here, as shown in
Also, in the driver unit 1040, a length from the boosting pin 1064 becoming the force point E3 at which force is applied to the driver arm 1042 to the fulcrum pin 1062 becoming a rotation fulcrum of the driver arm 1042 is denoted as L13, and a length from the driver 44 becoming the action point E4 to the fulcrum pin 1062 is denoted as L14.
In the equation (1), when a ratio of the length L12 from the boosting pin 1064 becoming the action point E2 to the fulcrum axis O to the length L11 from the force point E1 to the fulcrum axis O is reduced, the rate of decrease in load F that is applied to the handle arm 1052 increases.
In the stapler 1100A of the present embodiment, the cam groove 1056 is configured to have a long hole shape having the three sections, so that the fulcrum axis O of the handle arm 1052 is moved from the vicinity of the fulcrum pin 1062 toward the boosting pin 1064 according to the position of the handle arm 1052 in the operation of binding the sheet bundle. Thereby, in the first section 1056(1001) in which the operation of sandwiching the sheet bundle between the clincher arm 1012 and the magazine unit 1020 is performed, a moving amount of the handle arm 1052 and a moving amount of the driver arm 1042 are close to each other. For this reason, the rate of decrease in load is reduced but an increase in operating amount of the handle unit 1052 is suppressed. On the other hand, in the second section 1056(1002) and the third section 1056(1003) in which the operation of causing the staple to penetrate through and to bind the sheet bundle is performed, the moving amount of the handle arm 1052 increases, but the rate of decrease in load increases, so that the load applied to the handle arm 1052 is reduced. In this way, in a desired process of the operation of binding the sheet bundle, the load F that is applied to the handle arm 1052 is stepwise reduced so that the load F is adjusted according to the operation, thereby reducing the load F in a step where the staple penetrates through the sheet bundle.
[Holding Portion 1123a]
When the variable boosting mechanism is adopted for the stapler 1100A as described above, the cam groove 1056 of the handle arm 1052 slides with contacting the camshaft 1060 each time the binding processing is performed, so that a surface pressure between the cam groove 1056 and the camshaft 1060 increases and a high load is applied to the bearing part 1122. Here, in the stapler of the related art, since the diameter of the camshaft 1060 and the diameter of the shaft hole 1122a are selected to be substantially the same, an amount of grease that can be applied into a gap between the camshaft 1060 and the shaft hole 1122a may be limited to a certain amount. For this reason, when the amount of greases is reduced as the stapler 1100A is repeatedly used, the poor sliding is caused on the cam groove 1056.
Therefore, in the present embodiment, at the periphery of the shaft hole 1122a, the holding portion 1123a for storing grease for reducing friction between the cam groove 1056 and the camshaft 1060 is provided to suppress occurrence of poor sliding between the cam groove 1056 and the camshaft 1060.
The holding portion 1123a is a part of the periphery of the shaft hole 1122a, and is provided on an opposite side to a direction H1 in which the camshaft 1060 is abutted against the shaft hole 1122a by the cam groove 1056 by the load upon sliding of the handle arm 1052. Thereby, since an area of the shaft hole 1122a on the side against which the camshaft 1060 is abutted can be secured, the grease can be stored near the shaft hole 1122a without affecting the surface pressure between the camshaft 1060 and the shaft hole 1122a. In addition, the holding portion 1123a is formed to have a concave shape cut into a substantially semicircular shape from a peripheral edge portion of the shaft hole 1122a toward the clincher groove portion 1126 (front) in a radial direction, as seen from above.
Note that, the size of the holding portion 1123a can be arbitrarily designed according to an amount of grease to be held. Also, the shape of the holding portion 1123a is not limited to the semicircular shape, as seen from above, and may be, for example, a rectangular shape. In addition, a configuration where only one of the holding portions 1123a and 1125a is provided may be possible or two may be provided. Further, although the holding portion 1123a is formed by recessing at least a part of the outer surface of the bearing part 1122, the holding portion 1123a may also be formed to penetrate through the bearing part 1122 in the thickness direction (right and left direction).
[Example of Operations of Stapler 1100A]
As shown in
In the standby state, a sheet bundle (not shown) is placed on the clincher arm 1012 by the operator.
When the handle cover 1054 is pushed in the standby state by the operator, the cam groove 1056 is guided by the camshaft 1060, so that the handle arm 1052 and the handle cover 1054 are displaced by the rotation operation about the fulcrum axis O as a fulcrum formed near the fulcrum pin 1062, and the contact portion of the cam groove 1056 with the camshaft 1060 is moved.
When the handle arm 1052 is rotated as a result of pushing the handle cover 1054, the position of the boosting pin 1064 is accordingly displaced. Thereby, the driver arm 1042 connected to the handle arm 1052 via the boosting pin 1064 is pressed, so that both the driver arm 1042 and the magazine unit 1020 are rotated about the fulcrum pin 1062 as a fulcrum.
As the magazine unit 1020 is rotated, the sheet bundle (not shown) consisting of a predetermined number of sheets is sandwiched between the clincher unit 1010 and the magazine 1022. Also, as shown in
In the second section 1056(1002) of the cam groove 1056, the contact angle with the camshaft 1060 changes smaller by rotation of the handle arm 1052, as compared to the first section 1056(1001). Thereby, the fulcrum axis O of the handle arm 1052 is moved from the vicinity of the fulcrum pin 1062 toward the boosting pin 1064.
When the fulcrum axis O of the handle arm 1052 is moved from the vicinity of the fulcrum pin 1062 toward the boosting pin 1064, the length L11 from the force point E1 to the fulcrum axis O and the length L12 from the boosting pin 1064 becoming the action point E2 to the fulcrum axis O are reduced (refer to
When the handle cover 1054 is further pressed from the state where the sheet bundle is sandwiched, the driver arm 1042 is pressed due to displacement of the boosting pin 1064 by the rotation operation of the handle arm 1052. At this time, the driver arm 1042 rotates about the fulcrum pin 1062 as a fulcrum in a state where the rotation of the magazine 1022 is restricted. The rotation of the driver arm 1042 presses the connection staple against the driver 1044, so that one staple is separated. The staple separated into one piece is struck out from the striking-out opening 1200 and penetrates through a sheet bundle P (not shown).
Continuously, when the handle cover 1054 is further pressed and the handle arm 1052 is thus rotated to a position in which the staple penetrates through the sheet bundle, the cam groove 1056 of the handle arm 1052 is contacted to the camshaft 1060 in the third section 1056(1003), as shown in
When the fulcrum axis O of the handle arm 1052 is moved toward the boosting pin 1064, the length L11 from the force point E1 to the fulcrum axis O and the length L12 from the boosting pin 1064 becoming the action point E2 to the fulcrum axis O are further reduced (refer to
Continuously, when the handle cover 1054 is further pressed by the operator, the driver arm 1042 is pressed by displacement of the boosting pin 1064 due to the rotation operation of the handle arm 1052, and the driver arm 1042 further rotates about the fulcrum pin 1062 as a fulcrum in a state where the rotation of the magazine 1022 is restricted. When the tip end portions of the leg portions of the staple accordingly protrude from the backside of the sheet bundle, the leg portions are inwardly bent by the clincher groove portion 1126, so that the sheet bundle is bound by the staple.
In this state, the third section 1056(1003) of the cam groove 1056 is guided by the camshaft 1060 and thus rotates about the fulcrum axis O as a fulcrum formed closer to the boosting pin 1064 than the midpoint between the fulcrum pin 1062 and the boosting pin 1064. Here, the third section 1056(1003) of the cam groove 1056 has a center of the arc matched with the fulcrum axis O, so that when the third section 1056(1003) is guided by the camshaft 1060, the fulcrum axis O is not moved.
Thereby, the length L11 from the force point E1 to the fulcrum axis O and the length L12 from the boosting pin 1064 becoming the action point E2 to the fulcrum axis O do not change. Therefore, from the equation (1), the rate of decrease in load F that is applied to the handle arm 1052 is constant and the load F reduced to the desired value is maintained.
As described above, according to the present embodiment, since the holding portion 1123a for storing the grease is provided at the periphery of the shaft hole 1122a, the grease can be supplied to the shaft hole 1122a and the camshaft 1060. For this reason, even when the number of binding times increases, since the grease is supplied from the holding portion 1123a to the camshaft 1060 and the like all the time, it is possible to prevent the poor sliding between the cam groove 1056 of the handle arm 1052 and the camshaft 1060, and to smoothly maintain the sliding of the cam groove 1056. Thereby, it is possible to increase the number of durability even in the stapler 1100A having the variable boosting mechanism where the high load is applied to the camshaft 1060 and the like.
Subsequently, a holding portion 1123b that is a first modified embodiment of the holding portion 1123a for storing the grease is described. Note that, since a stapler 1100B according to the first modified embodiment has a configuration and a function similar to the stapler 1100A of the above embodiment, the common configurations are denoted with the same reference signs and the detailed descriptions are omitted or simplified.
The holding portion 1123b is formed by cutting the peripheral edge portion of the shaft hole 1122a in the outer surface, which faces the cam groove 1056 of the handle arm 1052, of the bearing part 1122 into a step shape over the entire circumference of the shaft hole. An inner diameter D3 of the holding portion 1123b is selected to be substantially the same as the diameter D1 of the shaft hole 1122a, and an outer diameter D4 of the holding portion 1123b is selected to be slightly greater than the diameter D1 of the shaft hole 1122a. In this way, the holding portion 1123b is configured as an annular groove (concave portion), as seen from above, which does not penetrate through the bearing part 1122 in the thickness direction.
Note that, the depth of the holding portion 1123b in the thickness direction, and the outer diameter D4 of the holding portion 1123b can be arbitrarily set according to the amount of grease to be stored. Also, the outer shape of the holding portion 1123b is an annular shape of a true circle but may also be an annular shape of an ellipse or a rectangular shape. Further, although the example where the holding portion 1123b is provided over the entire circumference of the shaft hole 1122a has been described, the holding portion 1123b may be provided on a circumferential portion of the shaft hole 1122a
As described above, according to the first modified embodiment, like the above embodiment, since the holding portion 1123b for storing the grease is provided, the grease can be supplied to the shaft hole 1122a and the camshaft 1060 all the time. Thereby, it is possible to prevent the poor sliding between the cam groove 1056 of the handle arm 1052 and the camshaft 1060, and to smoothly maintain the sliding of the handle arm 1052 having the cam groove 1056. As a result, it is possible to increase the number of durability even in the stapler 1100B having the variable boosting mechanism where the high load is applied to the camshaft 1060 and the like.
Subsequently, a holding portion 1123c that is a second modified embodiment of the holding portion 1123a for storing the grease is described. Note that, since a stapler 1100C according to the second modified embodiment has a configuration and a function similar to the stapler 1100A of the above embodiment, the common configurations are denoted with the same reference signs and the detailed descriptions are omitted or simplified.
The holding portion 1123c is provided at a part of the periphery of the shaft hole 1122a, and is formed by enlarging an opposite side to the direction H1, in which the cam groove 1056 of the shaft hole 1122a is abutted, toward the clincher groove portion 1126 (front) in the radial direction. More specifically, the holding portion 1123c is constituted by a hole portion excluding the shaft hole 1122a (camshaft 1060) from an elliptical hole having a long side D5 and a short side D6 and including the shaft hole 1122a.
As described above, according to the second modified embodiment, like the above embodiment, since the holding portion 1123c for storing the grease is provided, the grease can be supplied to the shaft hole 1122a and the camshaft 1060 all the time. Thereby, it is possible to prevent the poor sliding between the cam groove 1056 of the handle arm 1052 and the camshaft 1060, and to smoothly maintain the sliding of the handle arm 1052 having the cam groove 1056. As a result, it is possible to increase the number of durability even in the stapler 1100C having the variable boosting mechanism where the high load is applied to the camshaft 1060 and the like.
Subsequently, a holding portion 1123d that is a third modified embodiment of the holding portion 1123a for storing the grease is described. Note that, since a stapler 1100D according to the third modified embodiment has a configuration and a function similar to the stapler 1100A of the above embodiment, the common configurations are denoted with the same reference signs and the detailed descriptions are omitted or simplified.
The holding portion 1123d is provided at a portion of the periphery of the shaft hole 1122a, and is constituted by a hole portion formed by enlarging an opposite side to the direction H1, in which the cam groove 1056 of the shaft hole 1122a is abutted, toward the clincher groove portion 1126 (front) in the radial direction. More specifically, in a case where a diameter D7 of the holding portion 1123d is set greater than the diameter D1 of the shaft hole 1122a and an edge portion 1123de of the holding portion 1123d in the direction H1 and an edge portion 1122ae of the shaft hole 1122a in the direction H1 are overlapped, the holding portion 1123d is constituted by a hole portion excluding the shaft hole 1122a.
As described above, according to the third modified embodiment, like the above embodiment, since the holding portion 1123d for storing the grease is provided, the grease can be supplied to the shaft hole 1122a and the camshaft 1060 all the time. Thereby, it is possible to prevent the poor sliding between the cam groove 1056 of the handle arm 1052 and the camshaft 1060, and to smoothly maintain the sliding of the cam groove 1056. As a result, it is possible to increase the number of durability even in the stapler 1100D having the variable boosting mechanism where the high load is applied to the camshaft 1060 and the like.
Note that, the technical scope of the present invention is not limited to the above embodiments, and includes a variety of changes made to the above embodiments without departing from the gist of the present invention. For example, in order to prevent the poor sliding between the cam groove 1056 of the handle arm 1052 and the camshaft 1060, the holding portion 1123a is provided at the periphery of the shaft hole 1122a of the bearing part 1122. However, the present invention is not limited thereto. For example, the shaft holes 1122c and 1124c and the like of the bearing part 1122 may be provided with the holding portions for storing grease to prevent poor sliding between the fulcrum pin 1062 and the handle cover 1054 and the like. In the above embodiments, as the means for implementing the variable boosting mechanism, the cam groove 1056 is constituted by the three sections of the first section 1056(1001), the second section 1056(1002) and the third section 1056(1003). However, the present invention is not limited thereto. For example, the cam groove 1056 may also be constituted by two sections of the first section 1056(1001) and the second section 1056(1002). In this case, for example, the third section 1056(1003) is constituted as the second section 1056(1002)
The present specification describes at least the following inventions.
(1) A stapler including:
a clincher unit having a clincher part configured to bend leg portions of a staple and provided on one end portion-side;
a magazine unit having a magazine in which a staple bundle consisting of staples connected to each other is loaded, and supported on the other end portion-side of the clincher unit to be rotatable about a fulcrum shaft portion as a fulcrum with respect to the clincher unit
a driver unit having a driver configured to strike out a staple from the magazine and provided on one end portion-side, the other end portion-side of the driver unit being supported to be rotatable about the fulcrum shaft portion as a fulcrum with respect to the clincher unit;
a handle unit connected to the driver unit by a transmission shaft portion provided between the fulcrum shaft portion and the driver, and configured to move the driver unit toward the clincher unit for opening and closing;
a camshaft portion provided to any one of the clincher unit and the handle unit;
a cam groove portion provided to the other of the clincher unit and the handle unit, configured to permit the camshaft portion to enter, and having one open end portion in a direction, in which the clincher unit and the handle unit separate from each other, to enable the camshaft portion to be inserted/pulled out; and
a guide portion configured to restrict a movement path of the handle unit with respect to the clincher unit in operations of opening and closing the handle unit and the driver unit with respect to the clincher unit and the magazine unit.
(2) The stapler according to the above (1), wherein in an operation of opening the handle unit and the driver unit with respect to the clincher unit and the magazine unit, the camshaft portion separates from the cam groove portion, and
wherein in an operation of closing the handle unit and the driver unit with respect to the clincher unit and the magazine unit, the movement path of the handle unit with respect to the clincher unit is restricted by the guide portion and the camshaft portion enters the cam groove portion.
(3) The stapler according to the above (1) or (2), wherein the guide portion has a guide convex portion provided to any one of the clincher unit and the handle unit and a guide concave portion provided to the other of the clincher unit and the handle unit and configured to permit the guide convex portion to enter.
(4) A stapler including:
a clincher unit having a clincher part configured to bend leg portions of a staple and provided on one end portion-side;
a magazine unit having a magazine in which a staple bundle consisting of staples connected to each other is loaded, and supported on the other end portion-side of the clincher unit to be rotatable about a fulcrum shaft portion as a fulcrum with respect to the clincher unit;
a driver unit having a driver configured to strike out a staple from the magazine and provided on one end portion-side, the other end portion-side of the driver unit being supported to be rotatable about the fulcrum shaft portion as a fulcrum with respect to the clincher unit; and
a handle unit connected to the driver unit by a transmission shaft portion provided between the fulcrum shaft portion and the driver, and configured to move the driver unit toward the clincher unit for opening and closing;
wherein the magazine unit has:
a pusher provided to be movable along a length direction of the magazine.
a pusher spring for pressing the pusher toward a magazine front wall part of the magazine, and
a pusher band having one end portion attached to the pusher and the other end portion attached to the driver unit, and configured to connect the pusher and the driver unit, and
wherein in a state where the pusher is retreated by the pusher band and is moved to a most retreat position in an operation of opening the handle unit and the driver unit with respect to the clincher unit and the magazine unit,
a length between an inner surface-side of the magazine front wall part and the pusher is 75 mm or longer,
a length of the magazine is 90 mm or longer and 100 mm or shorter,
a length of the pusher band is 51 mm or longer and 61 mm or shorter,
a length from the fulcrum shaft portion to an attachment position of the pusher band to the driver unit is 41 mm or longer and 50 mm or shorter, and
an entire length of the stapler is 105 mm or longer and 125 mm or shorter.
(5) The stapler according to the above (4), further comprising:
a camshaft portion provided to any one of the clincher unit and the handle unit; and
a cam groove portion provided to the other of the clincher unit and the handle unit, configured to permit the camshaft portion to enter, and having one open end portion in a direction, in which the clincher unit and the handle unit separate from each other, to enable the camshaft portion to be inserted/pulled out.
(6) The stapler according to the above (4) or (5), wherein a ratio of the length of the magazine 30 and the length of the pusher band is 10:5.7 to 6.1, and
wherein a ratio of the length of the magazine 30 and the length from the fulcrum shaft portion to the attachment position of the pusher band to the driver unit is 10:4.6 to 5.0.
(7) A stapler including:
an operating member configured to be displaced by receiving force from an operator;
a clincher unit having a clincher groove configured to bend leg portions of a staple and provided at a front end portion; and
a shaft portion supported in a hole portion provided to the clincher unit, and configured to support the operating member,
wherein the hole portion has a holding portion for storing lubricant for reducing friction between the shaft portion and the operating member.
(8) The stapler according to the above (7), wherein the holding portion is provided at at least a portion of a periphery of the hole portion.
(9) The stapler according to the above (8), wherein the holding portion is provided to have a concave portion shape in a radial direction of the hole portion.
(10) The stapler according to the above (8) or (9), wherein the holding portion is provided in an opposite direction to a direction in which the shaft portion is abutted by a load of the operating member.
(11) The stapler according to one of the above (7) to (10), further including:
a driver unit having a driver connected to the operating member via a connecting portion and configured to separate staples loaded in the loading part into one staple and to strike out the same, and configured to be displaced in a rotation operation by receiving force of the operating member at the connecting portion; and
a magazine unit in which staples are loaded,
wherein the clincher unit is configured to rotatably support the driver unit and the magazine unit at a rear end portion,
wherein the operating member has a guide portion that is slidably engaged with the shaft portion, and
wherein a length from a force receiving portion to a fulcrum axis of a rotation operation, and a length from a force acting portion to the fulcrum axis are changed by moving the fulcrum axis according to an operation on the operating member, thereby changing a rate of decrease in load that is applied to the operating member.
(12) The stapler according to the above (8), wherein the holding portion is provided to have a step shape on a peripheral surface of the hole portion.
(13) The stapler according to the above (8), wherein the holding portion is provided by enlarging a circumferential portion of the hole portion in a radial direction.
The subject application is based on Japanese Patent Application Nos. 2019-005955 filed on Jan. 17, 2019 and 2019-005956 filed on Jan. 17, 2019, the contents of which are incorporated herein for reference.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-005955 | Jan 2019 | JP | national |
| 2019-005956 | Jan 2019 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/000686 | 1/10/2020 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2020/149235 | 7/23/2020 | WO | A |
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| Entry |
|---|
| Extended European Search Report for European Application No. 20741634.8 dated Jan. 16, 2023. (pp. 1-15). |
| Japanese Office Action dated Aug. 30, 2022, issued by the Japanese Patent Office in the corresponding Japanese Patent Application No. 2019-005956. (with English machine translation) (5 pages). |
| Indian Search Report dated Jan. 9, 2023, issued by the Indian Patent Office in the corresponding Indian Patent Application No. 202117032159. (7 pages). |
| International Search Report and Written Opinion issued in Application No. PCT/JP2020/000686 dated Mar. 24, 2020, 9 pages. |
| Indian Office Action dated Jan. 9, 2023, issued by the Indian Patent Office in the corresponding Indian Patent Application No. 202117032159. (7 pages). |
| Dec. 7, 2023—(CN) First Office Action—App 202080009620.5. |
| Number | Date | Country | |
|---|---|---|---|
| 20220111503 A1 | Apr 2022 | US |
