The present invention relates to a slotter that cuts off a one side corner portion of a rectangular corrugated sheet to form a joint margin of one side of the corrugated sheet.
As illustrated in
A flap cutter knife mounted on the slotter cuts off corner potions at one of the ends of the longitudinal direction to form a joint margin 5 on the one side. In succession, the joint margin 5 is pasted and the corrugated sheet is bent at the ruled lines 3a-3d, so that the joint margin 5 is glued to the other side of the sheet. Consequently, the corrugated sheet 1 is formed into a tube to serve as a cardboard box.
The slots 4 and the joint margin 5 are formed by a slotter included in a case former. The slotter includes a number of swivels arranged in the longitudinal direction of the corrugated sheet 1 each of which swivels has a slotter knife, so that a number of slots 4 are formed on the corrugated sheet 1. An example of a part of the slotter which part forms the joint margin 5 will now be described with reference to
A slotter 100 shown in
Furthermore, a scraper 120 is disposed inside the recess 114 and removes slotted chips clogging the recess 114. One upper slotter knife 110 positioning at the front end in the rotating direction includes a cutting blade 122 positioning at the rear end in the rotating direction and projecting exterior. The cutting blade 122 cuts the bottom (in
The slotter 100 is placed according to the position where the joint margin 5 is to be formed. A corrugated sheet 1 is feed into a space between the upper and lower swivels 106 or 108 in the direction that the arrows in
A creaser, which is disposed at the same position of the slotter 100 as the width-direction position of the corrugated sheet 1 and which does not appear in the drawings, forms the ruled line 3d. Additional non-illustrated swivels are arranged around the rotation axes 102 and 104 in parallel with the slotter 100 in the direction perpendicular to the direction that the corrugated sheet 1 travels. These additional swivels form slots 4 and creasers mounted on other axis form the ruled lines 3a-3c.
As illustrated in
As illustrated in
As a solution, Patent Literature 1 (Japanese Laid-Open Publication No. SHO 60-107327) discloses a slotter of
Upon the slotter cutting the corrugated sheet 1, the slotted chip 7 is stuffed into a recess 114, but the presence of the connecting point 9 causes the flap chip 8 to moves below the lower swivel 108 together with the slotted chip 7, so that the flap chip 8 can be correctly treated together with the slotted chip 7.
Then the flap chip 8 together with the slotted chip 7 is completely detached from the corrugated sheet 1 and is removed from the lower swivel 108 by the scraper 120. This configuration solves the above inconvenience. The nick 124 may be formed on a portion of a receiving blade 116 of the recess 114 formed on the lower swivel 108.
Since the nick 124 of the slotter of Patent Literature 1 is formed by directly processing the upper slotter knife 110 or the recess 114, the position of the nick 124 is fixed. However, the joint margin 5 has a shape and a size varying with corrugated sheet. The connecting point 9 is required to be outer side from the detaching line c of the joint margin 5, and therefore the position of the connecting point 9 depends on the position of the detaching line c of the joint margin 5.
Accordingly, when a corrugated sheet is small in size, with some shapes and some sizes of joint margins 5, the connecting point 9 cannot be formed. If the connecting point 9 cannot be formed, the above inconvenience is occurred. The absence of a discontiguous portion between the slot 4 and the detaching line c causes the flap chip 8 to separate from the slotted chip 7 and to be scattered around the slotter. The flap chips 8 are scattered and adhered to joint margins after being pasted or to corrugated sheets being under the printing part in the case former to cause problems of inferior gluing of the joint margin or chip intrusion.
For the above, scattering of flap chips has conventionally needed to be mitigated by slowing the travel speed (i.e. the producing speed) of corrugated sheets in the case former.
With the foregoing problems in view, the object of the present invention to surely form a connecting point between a slotted chip and a flap chip which are generated when a slotter of a case former forms a joint margin of a corrugated board and also to prevent the flap chip from scattering, so that inferior gluing of the joint margin and intrusion of the flap chip into the corrugated sheets.
To attain the object, there is provided a method for cutting a corrugated sheet by a slotter that includes: a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess, respectively fitted to the inner cutting blade and the outer cutting blade; and a nick formed on at least one of the outer cutting blade of the slotter knife and the outer receiving blade of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of the corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected at a connection, the method comprising: separating a portion having the nick from a main body of the slotter knife or a main body of the second swivel such that a distance along the circumference direction of the first or second swivel between the nick and a tip of the flap cutter knife is adjustable, and disposing the nick in vicinity of the tip of the flap cutter knife.
In the method of the present invention, the first swivel having the slotter knife or the second swivel having the recess to receive the cutting blades of the slotter knife has the portion having the nick and the remaining portion, which are separated from each other, so that the distance along the circumference direction of the first or second swivel between the nick and the tip of the flap cutter knife is adjustable. With this configuration, even when the sizes and the shapes of a corrugated sheet and a joint margin vary, the nick can always be positioned in the vicinity of the tip of the flap cutter knife. Thereby, the connection between the slotter chip and the flap chip can be surely formed regardless of the shapes of the joint margin. Accordingly, flap chips are prevented from scattering, so that the problems of inferior gluing of joint margins and of intrusion of chips into corrugated sheet caused by the flap chips can be solved.
A slotter that the above method can directly adopt includes: a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess, respectively fitted to the inner cutting blade and the outer cutting blade; and a nick formed on at least one of the outer cutting blade of the slotter knife and the outer receiving blade of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected, wherein a portion having the nick is separated from a main body of the slotter knife or a main body of the second swivel, and a distance along the circumference direction of the first or second swivel between the nick and a tip of the flap cutter knife is adjustable.
With this configuration of the slotter, even when the sizes and the shapes of a corrugated sheet and a joint margin vary, the nick can always be positioned in the vicinity of the tip of the flap cutter knife. Thereby, a connection between the slotter chip and the flap chip can be surely formed regardless of the shapes of the joint margin.
The slotter may further include a plurality of the nicks that form a plurality of connections between the slotted chip and the flap chip. When a number of nicks are provided, the slotter chip and the flap chip can be connected at a number of connections, so that the slotter chip can be surely connected to the flap chip. This configuration is effective for a large-size corrugated sheet from which a large-area of a flap chip is to be removed.
The slotter may further include a crimping knife, at the same point in the axis direction of the first swivel as the flap cutter knife is disposed, that crimps the flap chip in the width direction of the flap chip.
This configuration can provide the flap chip to a crimping line, so that the falling flap chip can escape from being caught in narrow potions. Consequently, slotter chips can be surely removed. This is particularly effective for a large-size corrugated sheet from which a large-area of a flap chip is to be removed.
There is provided a slotter knife included in a slotter that includes: a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; the slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess respectively fitted to the inner cutting blade and the outer cutting blade; and a nick formed on the outer cutting blade of the slotter knife, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected at a connection, wherein a portion having the nick is separated from the main body of the slotter knife, and the portion is attachable to the main body of the slotter knife and has an adjustable distance along the circumference direction of the first swivel from a tip of the flap cutter knife.
The configuration of the slotter knife of the present invention, when the slotter knife is mounted on a slotter, always makes it possible to arrange the nick in the vicinity of the tip of the flap cutter knife even if the sizes and the shapes of a corrugate sheet and a joint margin vary. Thereby, a connection formed between a slotter chip and a flap chip can always be arranged in the vicinity of the joint margin, so that the connection can be surely formed regardless of the shapes of the joint margin.
There are provided a first swivel and a second swivel included in a slotter including: the first swivel and the second swivel that rotates in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blades and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having receiving blades, on the both sides of the recess, each fitted to one of the inner cutting blade and the outer cutting blade; and a nick formed on one of the receiving blades of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected at a connection, wherein a portion having the nick is separated from the main body of the second swivel, and the portion is attachable to the main body of the second swivel and has an adjustable distance along the circumference direction of the second swivel from a tip of the flap cutter knife.
The configuration of the swivels of the present invention, when the swivels are mounted on a slotter, always makes it possible to arrange the nick in the vicinity of the tip of the flap cutter knife even if the sizes and the shapes of a corrugate sheet and a joint margin vary. Thereby, a connection formed between a slotter chip and a flap chip can always be arranged in the vicinity of the joint margin, so that the connection can be surely formed regardless of the shapes of the joint margin.
According to the method for cutting a corrugated sheet by a slotter, the slotter includes a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess, respectively fitted to the inner cutting blades and the outer cutting blade; and a nick formed on at least one of the outer cutting blade of the slotter knife and the outer receiving blade of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected, wherein a portion having the nick is separated from a main body of the slotter knife or a main body of the second swivel such that distance along the circumference direction between the nick and a tip of the flap cutter knife is adjustable. With this configuration, even when the sizes and the shapes of a corrugated sheet and a joint margin vary, the nick can always be positioned in the vicinity of the tip of the flap cutter knife. Thereby, a connection between the slotter chip and the flap chip can be surely formed regardless of the shapes of the joint margin. Accordingly, flap chips are prevented from scattering, so that inferior gluing of joint margins and intrusion of chips into corrugated sheet caused by the flap chips can be avoided.
The slotter of the present invention includes: a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess, respectively fitted to the cutting blades; and a nick formed on at least one of the outer cutting blade of the slotter knife and the outer receiving blade of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected, wherein a portion having the nick is separated from a main body of the slotter knife or a main body of the second swivel, and a distance along the circumference direction of the first or second swivel between the nick and a tip of the flap cutter knife is adjustable. This configuration of the slotter ensures the same effects as the above method for cutting.
The slotter knife of the present invention is included in a slotter that includes: a first swivel and a second swivel that rotate in respective different directions and that are vertically disposed; the slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having an inner receiving blade and an outer receiving blade, on the both sides of the recess, respectively fitted to the cutting blades; and a nick formed on the outer cutting blade of the slotter knife, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected at a connection, wherein a portion having the nick is separated from the main body of the slotter knife, and the portion is attachable to the main body of the slotter knife and has an adjustable distance along the circumference direction of the first swivel from a tip of the flap cutter knife. This configuration of the slotter knife ensures the same effects as the above method for cutting.
The swivels of the present invention are included in a slotter that includes: the first swivel and the second swivel that rotate
in respective different directions and that are vertically disposed; a slotter knife disposed on the first swivel and having an inner cutting blade and an outer cutting blade on the both sides of the outer circumference; a flap cutter knife disposed on the first swivel perpendicularly to the slotter knife; a recess disposed on the outer circumference of the second swivel and having receiving blades, on the both sides of the recess, each fitted to one of the cutting blades; and a nick formed on one of the receiving blades of the recess, the slotter knife and the flap cutter knife removing a corner portion of one end of a corrugated sheet placed between the first swivel and the second swivel such that a resultant slotted chip and a resultant flap chip are connected at a connection, wherein a portion having the nick is separated from the main body of the second swivel, and the portion is attachable to the main body of the second swivel and has an adjustable distance along the circumference direction of the second swivel from a tip of the flap cutter knife. This configuration of the swivels ensures the same effects as the above method for cutting.
Hereinafter, the present invention will now be detailed with reference to the accompanying drawings illustrating various embodiments. Dimension, material, shape, and relative position of the components described in embodiments should by no means be limited to those of the description unless specified.
The first embodiment of the present invention will now be described with reference to
Referring to
On the sliding member 26, a number of screw holes 31 are arranged in parallel along the sliding direction of the sliding member 26, so that selecting one screw hole 31 determines the fixed position of the division 14 relative to the sliding member 26.
With this configuration, the sliding member 26 and the division 14 are placed in such a position that the distance L between the flap cutter knife 30 and the nick 18 is minimized, and are then coupled via the bolt 32. The division 14 accommodated in the recess 13 having an L-shaped cross section and being included in the slotter knife body 12.
Next, the sliding member 26 is slid along the slotter knife body 12 and is positioned such that a detaching line c to be formed conforms to the sizes and the shapes of a corrugated sheet to be cut and a joint margin. After the positioning, the sliding member 26 is fixed to the slotter knife body 12.
Thereby, a connecting point 9 between the slotted chip 7 and flap chip 8 can be formed in the vicinity of the detaching line c. Advantageously, even if it seems to be difficult to form the connecting point 9 because the flap chip 8 has a small area, the connecting point 9 can be surely formed. Accordingly, with regard to a small-size corrugated sheet and the like, it is possible to prevent the flap chips 8 from scattering, thereby avoiding inadequate gluing of the joint margin 5 and also avoiding intrusion of flap chips 8 into fabricated corrugated sheet 1.
The shape of the nick 18 can be properly selected from various candidates such as a triangular pyramid and a circular concave.
Besides, coupling the sliding member 26 and the division 14 allows the cut-off knife 16 of the slotter knife body 12 and the flap cutter knife 30 to have only a small gap, so that the flap chip 8 is prevented from being left uncut. Since the sliding member 26 in which the flap cutter knife 30 is partially embedded and the division 14 having the nick 18 are integrated, the distance L can be maintained and the gap between the cut-off knife 16 on the slotter knife body 12 and the flap cutter knife 30 can be freely changed.
Next, the second embodiment of the present invention will now be described with reference to
With this configuration, the division 14 is positioned relatively to the slotter knife body 12 such that the distance L (see
In this embodiment, since the division 14 is not coupled to the sliding member 26, the distance between the nick 18 and the flap cutter knife 30 can be freely changed. In addition, separation between the division 14 and the sliding member 26 can lighten the weight of the sliding member 26, abating power that a driving device requires to slide the sliding member 26.
Description will now be made in relation of examples of the configuration of the division 14 of the present invention with reference to
In this embodiment, the slotter knife body 12, which has a thickness t1 larger than the thickness t2 of the division 14, is allowed to have an increased strength of the slotter knife body 12.
Next, the slotter knife of a third embodiment of the present invention will now be described with reference to
Next, the slotter knife of a fourth embodiment of the present invention will now be described with reference to
Even when the sizes and shapes of the corrugated sheet 1 and the joint margin 5 vary, the presence of a number of connection points 9 surely connects the slotted chip 7 and the flap chip 8 and more firmly connects the slotted chip 7 and flap chip 8. Thereby, it is possible to prevent the flap chip 8 from separating from the slotted chip 7 and also from scattering.
The crimping lines 42 causes the flap chip 8 to be easily bend at the crimping lines 42, so that the flap chip 8 falls without being caught in narrow portions.
Next, a fifth embodiment of the lower swivel will now be described with reference to
The other side wall of the recess 54, one of the side walls of the division 60a, and one of the side walls of the division 60b serve as receiving blades 56 to receive the cutting blade of the slotter knife. The outer circumference 58 of the lower swivel 52 serves as a face that receives the flap cutter knife.
With this configuration, the divisions 60a and 60b are circularly moved inside the recess 54 relatively to each other around the circumference of the lower swivel 52 and are positioned such that a nick 62 comes close to the tip of the flap cutter knife mounted to the upper swivel. Then, the divisions 60a and 60b at the positions determined as the above are fixed to the lower swivel 52 by means of coupler, such as bolts.
Since this configuration can dispose the connecting point 9 formed by the nick 62 in the vicinity of the detaching line C between the flap chip 8 and the joint margin 5, at least one connecting point 9 can be surely formed even when the sizes and the shapes of the corrugated sheet 1 and the joint margin 5 vary. Accordingly, scattering of the flap chips 8 can be avoided, so that inferior gluing of the joint margin 5 and intrusion of flap chips 8 into corrugated sheets can be surly avoided.
The present invention can avoid scattering of flap chips in a slotter of a case former, and can consequently avoid inferior gluing of the joint margin 5 and intrusion of flap chips 8 into corrugated sheets.
Number | Date | Country | Kind |
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2009-161665 | Jul 2009 | JP | national |
This application is a National Stage of PCT international application Ser. No. PCT/JP2010/060469 filed on Jun. 21, 2010 which is based upon and claims the benefit of priority from Japanese Patent Application No. 2009-161665 filed on Jul. 8, 2009.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2010/060469 | 6/21/2010 | WO | 00 | 12/29/2011 |