This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2010-124668, filed on May 31, 2010, the entire contents of which are incorporated herein by reference.
Embodiments describe herein relate generally to a cutter device and a printer.
A cutter includes an elongated fixed blade and a disc-shaped rotary blade, which cuts paper by moving the rotary blade along the fixed blade.
In such a cutter, the rotary blade is rotated while being moved along the fixed blade, so that the load required for the rotary blade to cut an object to be cut (or friction between the object and the blade) is reduced, thereby allowing the object to be smoothly cut.
However, in the above-described cutter, the rotation of the rotary blade is driven by a sliding resistance (or friction) between the fixed blade and the rotary blade or sliding resistance between the rotary blade and the paper, which is caused by moving the rotary blade along the fixed blade. In this case, fiber clumps produced in the paper cutting process and abrasion of the blade edge portion may affect the cutting process. Due to such problems, the rotary blade may have difficulty in rotating to cut the paper smoothly.
According to one embodiment, a cutter includes a carriage, a rotary blade mounted on the carriage, the rotary blade including a second blade edge on an outer circumferential part of the rotary blade, and a fixed blade including a first blade edge. The cutter further includes a moving mechanism configured to move the carriage along the first blade edge of the fixed blade; and a rotation driving mechanism configured to drive the rotary blade to rotate in conjunction with the movement of the carriage, in a cutting direction.
Embodiments will now be described in detail with reference to the drawings. Same components may be included in a plurality of embodiments to be described below. Therefore, the same reference numerals are allocated to the same components and duplicate descriptions are omitted.
A first embodiment will be described referring to
As shown in
The printing unit 4 includes a thermal head 11 and a platen roller 12. The thermal head 11 and the platen roller 12 are placed to face each other and a paper conveyance path 7 is formed therebetween, along which the paper 2 is conveyed. The thermal head 11 is configured to be biased toward the platen roller 12 by means of a biasing member such as a coil spring (not illustrated in the drawing). An ink ribbon 13 is configured to be suspended with tension by the thermal head 11. The ink ribbon 13 is supported by two ribbon cores 14 and 15 with both ends of the ink ribbon 13 wound around the two ribbon cores, respectively. An unused part of the ink ribbon 13 is wound around the ribbon core 14 while a used part thereof is wound around the ribbon core 15. The platen roller 12 is connected to a motor used as a driving source (not illustrated) so that the motor drives the platen roller 12 to rotate. The rotation of the platen roller 12 causes the paper 2 to be conveyed while being inserted between the platen roller 12 and the thermal head 11. As such, the printing unit 4 including the platen roller 12 and the thermal head 11 also functions as a conveying unit.
As shown in
In the configuration of printer 1 above, the paper 2, being inserted between the thermal head 11 and the platen roller 12, is conveyed by the rotation of the platen roller 12, while the thermal head 11 performs printing on the paper 2. The ink applied on the ink ribbon 13 may be melted by heating an appropriate heating element from a plurality of heating elements of the thermal head 11. The melted ink transfers onto the paper 2 and thus is printed on the paper 2. Once printing is completed, paper 2 is cut by the cutter 5 and then is discharged through a paper outlet 6a formed in the case 6. The above operation may be performed by controlling the printing unit 4 and the cutter 5 by a control unit (not illustrated in the drawings).
In the following, the cutter 5 will be described in detail.
As illustrated in
The fixed blade 21 has an elongated plate shape extending along a widthwise direction of the cutter 5. Formed in an edge portion in a thickness direction of the fixed blade 21 is the first blade edge 21a. The first blade edge 21a is formed linearly (specifically in a straight line) along the width direction of the cutter 5. In other words, the first blade edge 21a is formed in a straight line along the paper width direction which is perpendicular to the paper conveying direction (i.e., the direction indicated by the arrow a in the drawings). The first blade edge 21a is disposed to face the paper conveyance path 7. Further, the fixed blade 21 includes two surfaces 21b and 21c, which face outward in opposite directions. Specifically, the surface 21b of the fixed blade 21 is configured to guide the rotary blade 22. The fixed blade 21 is made of, e.g., metal.
As shown in
A portion 22e of the rotary blade 22, which includes a part of the second blade edge 22b, overlaps with the fixed blade 21 (in the direction of the rotation axis 22c of the rotary blade 22) to be in contact with the fixed blade 21. Specifically, the rotary blade 22 includes two surfaces 22f and 22g, which face outwards in opposite directions. Further, the surface 22f of the rotary blade 22 is configured to be in contact with the surface 21b and the first blade edge 21a of the fixed blade 21. The rotary blade 22 is made of, for example, metal.
The rotary blade 22 cuts the paper 2 in cooperation with the fixed blade 21 by rotating in the direction of arrow e, illustrated in
As shown in
The first frame member 31 may be formed of resin or metal and the like. The first frame member 31 includes a blade accommodation part 31a configured to accommodate a part of the rotary blade 22, as shown in
The second frame member 32 includes a connecting part (not shown) into which the other end of the axis member 33 is fitted. The second frame member 32 is fastened to the first frame member 31 by means of screws. Formed in the second frame member 32 are convex portions 32a configured to slide in a second guide member 42 (to be described later) of the moving mechanism 24, as presented in
As shown in
A flange 38a (used as an engaging part) configured to engage with the other surface 22g of the rotary blade 22 is formed to protrude on an outer circumferential part of the bearing 38.
As presented in
The moving mechanism 24 is configured to move the carriage 23 mounting the rotary blade 22 therein along the first blade edge 21a of the fixed blade 21. As shown in
The first and the second guide members 41 and 42 are configured to be displaced with respect to the fixed blade 21. Specifically, the second guide member 42 being screwed to the first guide member 41, the first guide member 41 is screwed to the case 6. Further, the first and the second guide members 41 and 42 are configured to support the carriage 23, with the carriage 23 being interposed therebetween.
The first guide member 41 is disposed along the width direction of the cutter 5. The first guide member 41 is constituted by connecting a first plate 41a and a second plate 41b to each other to form an approximately āLā shape when viewed from the side. The first plate 41a is fitted into the fitting part 31c of the carriage 23. The second plate 41b is disposed approximately parallel with the surface 22f of the rotary blade 22. A first paper insert hole 41c for inserting the paper 2 therethrough is provided in the first guide member 41. In the present embodiment, the first guide member 41 is disposed along the first blade edge 21a and functions as a fixed member whose position is determined with respect to the first blade edge 21a.
The second guide member 42 is disposed along the width direction of the cutter 5. The second guide member 42 is formed in an approximately flat plate shape. A rectangular second paper insert hole 42a for inserting the paper 2 therethrough is formed in the second guide member 42. At one edge of the paper insert hole 42a, a bent part 42b is provided to guide the paper 2.
As presented in
In the moving mechanism 24, rotation of the rotating axis 43a of the motor 43 causes the endless belt 44 to turn around, thereby moving the carriage 23 along the first blade edge 21a of the fixed blade 21. At this time, the moving mechanism 24 causes the carriage 23 to move in one direction along the first blade edge 21a of the fixed blade 21 (e.g., direction of an arrow d in
As shown in
The rotary member 51 performs the conversion of the movement of the carriage 23 (i.e., linear movement in the present embodiment) into the rotation of the rotary blade 22 in the cutting direction. In this embodiment, the rotary member 51 may be a ball bearing having a cylindrical shape. The ball bearing may have a well-known structure where a plurality of balls is disposed between a ring member formed in the inner circumferential side and another ring member formed in the outer circumferential side. The rotary member 51 is inserted into a through hole 31e formed in the first frame member 31, as shown in
While the rotary blade 22 moves along the first blade edge 21a together with the carriage 23, the rotary member 51 rotates by friction between the rotary member 51 and the second plate 41b of the first guide member 41, to thereby drive the rotary blade 22 to rotate. Specifically, while the carriage 23 moves in a direction along the first blade edge 21a of the fixed blade 21 (direction of an arrow d in
In the above configuration, the rotary blade 22 moves along the first blade edge 21a of the fixed blade 21 together with the carriage 23 by the driving of the motor 43, during which the rotary member 51 converts the movement of the carriage 23 to the rotational motion of the rotary blade 22 in the cutting direction. In this manner, the rotary blade 22 cuts the paper 2 in cooperation with the fixed blade 21. As a result, the cutter 5 according to the present embodiment cuts the paper 2 with the rotary blade 22 and the fixed blade 21 by rotating the rotary blade 22, which is driven by the movement of the carriage 23, in the course of moving the carriage 23 along the first blade edge 21a, the carriage 23 rotatably supporting the rotary blade 22 and the first blade edge 21a provided along the longitudinal direction of the fixed blade 21.
As explained above, the cutter 5 in the present embodiment includes the rotary member 51 as the converting part configured to convert the movement of the carriage 23 into the rotational motion of the rotary blade 22 in the cutting direction. Thus, according to the cutter 5 in the embodiment, the rotary blade 22 moving along the first blade edge 21a of the fixed blade 21 is driven to rotate by the rotary member 51, thereby suppressing any malfunction in rotation of the rotary blade 22 and enabling a smooth cutting of the paper 2. By rotating the rotary blade 22 in this manner, the load (or resistance) required for cutting the paper 2 is reduced, so that the paper 2 can be more smoothly cut, compared with a configuration without the function of rotating the rotary blade 22 with the rotary member 51. Furthermore, by rotating the rotary blade 22 with the rotary member 51, the entire part of the second blade edge 22b of the rotary blade 22 is evenly used in paper cutting, which results in extending the life of the rotary blade 22 compared with a configuration without rotating the rotary blade 22 with the rotary member 51.
Further, the cutter 5 according to the present embodiment includes the axis member 33 provided in the carriage 23, the two surfaces 22f and 22g provided in the rotary blade 22, facing outward in opposite directions. Further, the cutter 5 includes the coil spring 34 provided in the carriage 23, which acts as the biasing member configured to apply biasing force to the rotary blade 22 against the fixed blade 21 to thereby keep the surface 22f in contact with the fixed blade 21, and the first guide member 41 extending along the first blade edge 21a, which acts as the fixed member whose position is determined with respect to the fixed blade 21. The axis member 33 is connected to the center part of the rotary blade 22 and thus rotatably supports the rotary blade 22. The rotary member 51 (used as the converting part) is mounted in the carriage 23 and is interposed between the surface 22f of the rotary blade 22 and the first guide member 41 used as the fixed member. Accordingly, the rotary member 51 controls the rotary blade 22 not to tilt along the contact part between the rotary blade 22 and the fixed blade 21, which enables quality cutting of the paper 2. As such, the rotary member 51 acts as a tilt control member which restrains the tilting of the rotary blade 22.
Further, the rotary member 51 used as the converting part in the present embodiment is a ball bearing. Therefore, the rotary member (converting part) can be easily implemented.
The following is a description of a second embodiment with reference to
The present embodiment may use basically the same configuration as the first embodiment, but differs from the first embodiment in using a rotary member 151 as the converting part.
The rotary member 151 in this embodiment is a spherical body as shown in
In accordance with the cutter 5 in the present embodiment as described above, the rotary blade 22 moving along the first blade edge 21a of the fixed blade 21 is forcibly driven to rotate by the rotary member 151, thereby suppressing any malfunction in rotation of the rotary blade 22 and enabling quality cutting of the paper 2, in the same manner as in the first embodiment.
In relation to the above configuration, according to the first embodiment, a condition may be caused between a part of the rotary member 51 and the rotary blade 22 along the diameter direction of the rotary blade 22 wherein the rotary blade 22 spins too fast and slips due to the relatively large contact between the rotary member 51 and the rotary blade 22. In contrast, the present embodiment employs a spherical body as the rotary member 151. With this configuration, contact between the rotary member 151 and the rotary blade 22 becomes relatively smaller, which prevents the above-discussed condition between the rotary member 151 and the rotary blade 22.
As explained above, in accordance with the cutter 5 of the first and the second embodiments, the paper 2 can be smoothly cut by suppressing any malfunction in rotation of the rotary blade 22.
In some embodiments, the fixed member may be installed separately from the first guide member 41.
In some other embodiments, a plurality of teeth may be formed on the rotary member 51 and the fixed member to engage with each other. Also, such tooth-engagement structure may be employed in the rotary member 51 and the rotary blade 22 to engage with each other.
Further, in some embodiments, the object to be cut may be a film, cloth tape, and so on.
While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the invention. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the invention.
Number | Date | Country | Kind |
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2010-124668 | May 2010 | JP | national |