JP2018171706A - Cutter blade driving mechanism, cutter and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter blade movement mechanism capable of accurately returning a cutter blade cutting a medium at an advanced position to a retreated position.SOLUTION: A transmission mechanism 34 transmitting rotation of a driving motor 31 to a driving gear 32 includes: a cutter blade returning gear 50 engaging with the driving gear 32; a composite gear 40 transmitted with the rotation of the driving motor 31; and a transmission gear 51 engaging with the composite gear 40 and the cutter blade returning gear 50. A first cutter blade 21 is moved to an advanced position 21A while an intermittent tooth portion 43a of the composite gear 40 and the transmission gear 51 are engaging with each other. When it is in a state where engagement between the intermittent tooth portion 43a and the transmission gear 51 is released and a composite gear side protrusion portion 44b of the composite gear 40 is brought into contact with a cutter blade returning protrusion portion 50b of the cutter blade returning gear 50, the cutter blade returning gear 50 is associatively rotated with the composite gear 40, the driving gear 32 is rotated in an opposite direction, and the first cutter blade 21 is returned to a retreated position 21B.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a cutter driving mechanism and a cutter for cutting a sheet-like medium by moving a cutter blade forward and backward. The present invention also relates to a printer equipped with such a cutter.

  A printer equipped with a cutter is described in Patent Document 1. The cutter of the same document includes a cutter blade driving mechanism for moving the cutter blade back and forth between an advance position for cutting the recording paper and a retract position separated from the advance position. The cutter blade drive mechanism includes a drive motor, two cutter drive gears to which the drive force from the drive motor is transmitted, and a guide for guiding the movable blade in the forward / backward direction. The two cutter driving gears are arranged in an orthogonal direction orthogonal to the advancing / retreating direction of the movable blade in a state where their rotation axes are oriented in a direction orthogonal to the moving surface of the movable blade. The two cutter driving gears mesh with each other and rotate synchronously. Each cutter drive gear is provided with a drive pin at a position off the center of its end face. A long hole extending in the orthogonal direction is formed in the movable blade, and a driving pin of each cutter driving gear is inserted into the long hole.

  When the two cutter driving gears are rotated by the driving force of the driving motor, each driving pin moves in the forward and backward direction while moving in the orthogonal direction in the elongated hole. Therefore, each drive pin contacts the opening edge of the elongated hole and moves the movable blade in the forward and backward direction. While each cutter drive gear makes one rotation, the movable blade reciprocates once between a forward position overlapping the fixed blade and a retracted position where a gap is formed between the fixed blade. In the cutter blade moving mechanism described in Patent Document 1, the drive motor stops after the movable blade is returned from the forward movement position to the backward movement position.

JP-A-10-217182

  In the cutter blade moving mechanism of Patent Document 1, if there is a variation in the stop position of the drive motor, the movable blade is displaced from the retracted position by the variation. Here, if the movable blade returned to the retracted position is positioned closer to the advanced position than the retracted position, for example, when the movable blade arranged at the retracted position is covered with a cover, the movable blade The cutting edge may be exposed from the cover and become dangerous. Therefore, in such a cutter, it is necessary to ensure a large stroke of the movable blade so that the movable blade is located in the range covered by the cover even when the stop position of the drive motor varies. However, when the stroke of the movable blade is increased, the size of the apparatus is increased.

  The subject of this invention is providing the cutter blade moving mechanism and cutter which can return the cutter blade which cut | disconnected the medium in the advance position to a retracted position correctly in view of such a point. Moreover, it is providing the printer which mounts such a cutter.

  In order to solve the above problems, the present invention provides a drive gear in a cutter blade drive mechanism that reciprocates a cutter blade between a forward position for cutting a sheet-like medium and a backward position separated from the forward position. A rotation / linear motion conversion mechanism for converting rotation of the drive gear into linear motion and moving the cutter blade back and forth, a drive motor, and a transmission mechanism for transmitting the rotation of the drive motor to the drive gear; Has a cutter blade return gear that meshes with the drive gear, an intermittent gear that transmits the rotation of the drive motor, and a transmission gear that transmits the rotation of the intermittent gear to the cutter blade return gear. The cutter blade returning gear includes a protrusion at a position spaced radially from the rotating shaft, and the intermittent gear can contact the protrusion at a position spaced radially from the rotating shaft. The cutter blade includes an abutment portion, and the cutter blade moves from the retracted position to the advanced position by rotation of a predetermined rotation angle of the drive gear in the first rotation direction, and is opposite to the first rotation direction of the drive gear. It moves from the advance position to the retreat position by the rotation of the specified rotation angle in the second rotation direction.

  According to the present invention, the intermittent gear to which the rotation of the drive motor is transmitted includes the abutting portion that can abut on the projection for returning the cutter blade. Therefore, while the contact between the contact portion of the intermittent gear and the protrusion of the cutter blade return gear is maintained, the drive gear is rotated in the second rotation direction by rotating the cutter blade return gear with the intermittent gear. Can be made. Here, the rotation angle at which the drive gear rotates in the second direction is set to a desired rotation angle by setting a period during which the contact between the contact portion of the intermittent gear and the projection of the cutter blade returning gear is maintained. can do. Therefore, while the contact portion of the intermittent gear is in contact with the projection of the cutter blade returning gear, the drive gear can be rotated by a specified rotation angle, and then the drive gear can be stopped. As a result, the cutter blade can be stopped at the retracted position without stopping the drive motor, so that the cutter blade involved in the deviation of the stop position of the drive motor can be accurately disposed at the retracted position.

  In the present invention, in order to accurately reciprocate the cutter blade between the front side position and the rear side position, while the tooth portion of the intermittent gear meshes with the transmission gear, the intermittent gear is rotated. The drive gear is rotated in the first rotation direction by the specified rotation angle, and the engagement portion of the intermittent gear is disengaged between the toothed portion of the intermittent gear and the transmission gear. When contacting the projection of the blade returning gear, it is preferable that the drive gear is rotated in the second rotational direction by the specified rotational angle by rotating the intermittent blade with the cutter blade returning gear.

  In the present invention, it is desirable that the protrusion is provided on the outer peripheral side of the tooth portion in the intermittent gear. In this way, the cutter blade can be moved from the advanced position to the retracted position at a higher speed than the speed at which the cutter blade is moved from the retracted position to the advanced position.

  In the present invention, the rotation / linear motion conversion mechanism may be a rack and pinion mechanism. According to the rack and pinion mechanism, the rotation angle of the drive gear corresponds to the movement distance of the movable blade, so that the cutter blade can be moved more accurately than when a link mechanism is used for the rotation / linear motion conversion mechanism. Can do.

  In the present invention, an urging member that urges the cutter blade from the advanced position toward the retracted position may be provided. In this way, the movement of the cutter blade from the forward position to the backward position can be assisted by the biasing force of the biasing member.

  In the present invention, the drive gear may also serve as the transmission gear. That is, a configuration in which the teeth of the intermittent gear are engaged with the drive gear and the rotation of the intermittent gear is transmitted to the cutter blade return gear via the drive gear may be employed. In this way, it is not necessary to provide a transmission gear in addition to the drive gear.

  Next, the cutter of the present invention includes the cutter blade driving mechanism, a first cutter blade that moves between the forward position and the backward position by the cutter blade driving mechanism, and the forward position to the forward position. And a second cutter blade capable of contacting the first cutter blade facing.

  According to the present invention, the first cutter blade can be accurately moved between the forward movement position and the backward movement position, so that it is not necessary to ensure a larger stroke than necessary. Therefore, it becomes easy to reduce the size of the cutter.

  Next, the printer of the present invention includes the cutter, the print head, a transport mechanism that transports a sheet-like medium along a transport path 16 that passes through a print position by the print head and a cutting position by the cutter, It is characterized by having.

  According to the present invention, since it is easy to reduce the size of the cutter, it is easy to reduce the size of the printer on which the cutter is mounted.

1 is a perspective view of a printer according to an embodiment of the present invention. It is a schematic sectional drawing of the printer of FIG. It is a perspective view of a cutter. It is a side view of a cutter. It is explanatory drawing of the cutting operation of the recording paper by a cutter. It is explanatory drawing of the cutting operation of the recording paper by a cutter. It is explanatory drawing of the cutting operation of the recording paper by a cutter. It is explanatory drawing of the cutting operation of the recording paper by a cutter. It is explanatory drawing of the cutting operation of the recording paper by a cutter.

  A printer according to an embodiment of the present invention will be described below with reference to the drawings.

(overall structure)
FIG. 1A is a perspective view of a printer according to an embodiment of the present invention, and FIG. 1B is a perspective view with the exterior of the printer of FIG. 1 removed. FIG. 2 is a schematic sectional view of the printer of FIG. The printer 1 of this example is a roll paper printer that performs printing on a long recording paper 3 fed out from the roll paper 2. As shown in FIG. 1, the printer 1 includes a printer case 4 having a rectangular parallelepiped shape as a whole. A discharge port 5 for discharging the recording paper 3 is provided in the front portion of the upper surface of the printer case 4. The discharge port 5 extends in the width direction of the printer 1. Hereinafter, directions orthogonal to each other will be described as a printer width direction X, a printer longitudinal direction Y, and a printer vertical direction Z.

  The printer case 4 includes a box-shaped case body 6 and an opening / closing door 8 that covers the case body 6 from above. The case main body 6 includes a roll paper storage unit 7 (see FIG. 2) inside, and the open / close door 8 blocks the roll paper slot 7a of the roll paper storage unit 7 from above (above the printer vertical direction Z). To do.

  The open / close door 8 is provided at the rear Y2 of the discharge port 5 (rear Y2 in the front-rear direction Y of the printer). An opening / closing button 9 is provided on one side X <b> 1 of the opening / closing door 8 in the printer width direction X. A power switch 10 is provided behind the open / close button 9 Y2. When the open / close button 9 is operated, the lock of the open / close door 8 can be released. When the lock is released, the open / close door 8 can be rotated around the rotation axis extending in the printer width direction X at the rear end portion. As shown in FIG. 1, the opening / closing door 8 closes the roll paper storage unit 7 in a flat position, and the roll paper storage unit 7 is opened in an upright position as shown by a dotted line in FIG. 2. Move between the open positions 8B.

  As shown in FIG. 2, a print head 14 and a cutter 15 are mounted inside the printer case 4. Further, inside the printer case 4, a conveyance path 16 for the recording paper 3 from the roll paper storage unit 7 to the discharge port 5 via the printing position A by the print head 14 and the cutting position B by the cutter 15 is provided. ing.

  The print head 14 is a thermal head. The printing position A is defined by a platen roller 17 that faces the print head 14. A rotational driving force of the transport motor 18 is transmitted to the platen roller 17. The platen roller 17 and the transport motor 18 constitute a transport mechanism that transports the recording paper 3 along the transport path 16.

  The printer 1 drives the transport motor 18 to transport the recording paper 3 set along the transport path 16 at a constant speed by the platen roller 17. In addition, the printer 1 drives the print head 14 to print on the recording paper 3 conveyed through the printing position A. Further, the printer 1 drives the cutter 15 to cut the recording paper portion of the recording paper 3 that has been printed.

(cutter)
FIG. 3 is a perspective view of the cutter 15. FIG. 4 is a side view of the cutter 15. In FIG. 4, these are described so that the intermittent tooth portion of the compound gear, the compound gear side protrusion and cam, and the cutter blade return protrusion of the cutter blade return gear can be clearly understood. As shown in FIG. 1B and FIG. 3, the cutter 15 includes a first cutter blade 21 and a second cutter blade 22 that cuts the recording paper 3 together with the first cutter blade 21. Moreover, the cutter 15 is provided with the 1st cutter blade moving mechanism 24 which moves the 1st cutter blade 21 along the preset movement surface 23 (refer FIG. 2). The moving surface 23 is a surface that intersects the conveyance path 16 at the cutting position B, and is orthogonal to the printer vertical direction Z below the discharge port 5. As shown in FIG. 4, the first cutter blade moving mechanism 24 reciprocates the first cutter blade 21 between an advance position 21A for cutting the recording paper 3 and a retract position 21B spaced from the advance position 21A.

  Further, the cutter 15 rubs the second cutter blade 22 against the first cutter blade 21 to cut the recording paper 3 and a separation position 22B away from the first cutter blade 21 (moving surface 23). A second cutter blade moving mechanism 25 that swings between the first and second cutter blades.

  The cutter 15 cuts the recording paper 3 on the conveyance path 16 by moving the first cutter blade 21 from the retreat position 21B to the advance position 21A in a state where the second cutter blade 22 is disposed at the rubbing position 22A. Cut at B.

(First cutter blade and second cutter blade)
As shown in FIG. 3, the first cutter blade 21 has its blade edge 21 a facing forward Y <b> 1 (front Y <b> 1 in the printer longitudinal direction Y). The 1st cutter blade 21 is plate shape and is provided with the plane shape of right-and-left object. The first cutter blade 21 is provided with a V-shaped blade portion 21b whose center in the printer width direction X is retracted rearward Y2 on the front side thereof. Moreover, the 1st cutter blade 21 is provided with a pair of riding-up part 21c which protrudes ahead Y1 on the both sides of the printer width direction X of the blade part 21b. Each riding portion 21c extends to a position where it overlaps with both end portions (the riding portion 22c) of the second cutter blade 22 in the printer width direction X when viewed from the printer vertical direction Z. A rear portion of the first cutter blade 21 is supported by a rack member 27. Further, the cutter 15 blade and the rack member 27 are supported by the door side frame 28 (see FIG. 1B) so as to be movable in the longitudinal direction Y of the printer.

  The second cutter blade 22 has its cutting edge 22a facing backward Y2. The 2nd cutter blade 22 is plate shape, and is provided with the rectangular planar shape long in the printer width direction X as a whole. The second cutter blade 22 is a raised portion 21c on which the riding portion 21c of the first cutter blade 21 can be rubbed from above at both end portions in the printer width direction X on the rear side (the side facing the first cutter 21). Is provided. The blade portion 22b of the second cutter blade 22 extends linearly in the printer width direction X between the raised portions 21c. The second cutter blade 22 is mounted on the support frame 29.

(First cutter blade movement mechanism)
As shown in FIG. 3, the first cutter blade moving mechanism 24 converts the rotation of the drive motor 31, which is a drive source, the drive gear 32, and the drive gear 32 into a direct motion and moves the first cutter blade 21 to the moving surface. A rotation / linear motion conversion mechanism 33 that moves forward and backward along the line 23 and a transmission mechanism 34 that transmits the rotation of the drive motor 31 to the drive gear 32. Further, the first cutter blade moving mechanism 24 has a biasing member that biases the first cutter blade 21 from the forward position 21A side to the backward position 21B. The biasing member is a coil spring 35.

  The rotation / linear motion conversion mechanism 33 is a rack and pinion mechanism. That is, the rotation / linear motion conversion mechanism 33 includes a pinion 37 that is disposed coaxially with the drive gear 32 and rotates integrally with the drive gear 32, and a rack 27 a provided on the rack member 27 that supports the first cutter blade 21. The pinion 37 meshes with the rack 27a. The drive motor 31 is a DC motor and is rotationally driven in one direction. Here, the rotation / linear motion conversion mechanism 33 moves the first cutter blade 21 from the retreat position 21B to the advance position 21A by rotating the drive gear 32 by a specified rotation angle in the first rotation direction R1 (see FIG. 4). Let Further, the rotation / linear motion conversion mechanism 33 advances the first cutter blade 21 by rotating the drive gear 32 by a specified rotation angle in a second rotation direction R2 (see FIG. 4) opposite to the first rotation direction R1. The position 21A is moved to the retracted position 21B.

  The transmission mechanism 34 is located on the downstream side of the compound gear 40, the upstream transmission mechanism 41 positioned upstream of the compound gear 40 in the rotation transmission path of the drive motor 31, and the compound gear 40. A downstream transmission mechanism 42 is provided. The first cutter blade 21 reciprocates once between the forward movement position 21A and the backward movement position 21B while the compound gear 40 makes one rotation in one direction by driving of the drive motor 31.

  The compound gear 40 is disposed below the moving surface 23 of the first cutter blade 21 with its rotation axis directed in the printer width direction X. As shown in FIG. 4, the compound gear 40 includes an intermittent gear portion 43 having an intermittent tooth portion (tooth portion) 43 a formed in a predetermined angle range, and the intermittent gear portion 43 having a larger diameter than the intermittent gear portion 43. A large-diameter gear portion 44 formed coaxially is provided. The large-diameter gear portion 44 is located on the X1 side (outside) of the intermittent gear portion 43 in the printer width direction X.

  The large-diameter gear portion 44 is provided with a tooth portion 44a on the entire outer periphery thereof. Further, the large-diameter gear portion 44 includes a compound gear side protrusion (contact portion) 44 b that protrudes in the printer width direction X toward the intermittent gear portion 43 on the end face on the intermittent gear portion 43 side. The compound gear side protrusion 44b is provided on the outer peripheral side of the intermittent gear portion 43a of the intermittent gear portion 43 at an angular position different from that of the intermittent gear portion 43a. The compound gear side protrusion 44b has a dimension extending in the circumferential direction and extending over a predetermined angular range.

  Further, the compound gear 40 includes a cam 44c. The cam 44 c is formed integrally with the intermittent tooth portion 43 a and the large diameter gear portion 44. The cam 44c and the compound gear side protrusion 44b of the large diameter gear portion 44 are provided at different angular positions.

  The upstream transmission mechanism 41 includes a pinion 46 attached to the rotation shaft of the drive motor 31, a worm 47 to which the rotation of the pinion 46 is transmitted, and a clutch mechanism 48 provided between the worm 47 and the pinion 38. . The drive motor 31 is arranged with its rotation axis directed in the printer vertical direction Z. The worm 47 is arranged with its rotation axis directed in the up-down direction Z of the printer. The worm 47 meshes with the tooth portion 44 a of the large-diameter gear portion 44 in the compound gear 40. The clutch mechanism 48 cuts the transmission path between the worm 47 and the pinion 38 when a large rotational force is input from the downstream side to the upstream side of the transmission path. Thereby, the clutch mechanism 48 prevents the first cutter blade moving mechanism 24 from being damaged.

  The downstream transmission mechanism 42 includes a cutter blade return gear 50 that meshes with the drive gear 32 and a transmission gear 51 that transmits the rotation of the composite gear 40 to the cutter blade return gear 50. The drive gear 32, the cutter blade returning gear 50, and the transmission gear 51 are disposed above the intermittent gear portion 43 of the compound gear 40. Further, the drive gear 32, the cutter blade returning gear 50, and the transmission gear 51 are arranged in this order from the front Y1 to the rear Y2. The rotation axis of the drive gear 32 is located in front Y1 of the rotation axis of the compound gear 40, and the rotation axis of the transmission gear 51 is located in the printer rear Y2 from the rotation axis of the compound gear 40.

  The transmission gear 51 can mesh with the intermittent tooth portion 43a of the compound gear 40 (intermittent gear portion 43). The cutter blade returning gear 50 is an intermittent gear. The intermittent tooth portion 50 a of the cutter blade returning gear 50 meshes with both the drive gear 32 and the transmission gear 51. The cutter blade returning gear 50 can also be a normal gear provided with teeth on the entire circumference.

  The cutter blade return gear 50 includes a cutter blade return protrusion 50b at a position spaced radially from the rotation axis thereof. The cutter blade returning projection 50b has a fan shape that spreads outward in the circumferential direction. The essential part of the fan shape coincides with the rotation axis of the cutter blade returning gear 50.

  The cutter blade returning projection 50b can abut on the compound gear side projection 44b of the compound gear 40. That is, the circular movement path along which the cutter blade return projection 50b moves while the cutter blade return gear 50 makes one rotation, and the composite gear side projection 44b of the composite gear 40 while the composite gear 40 makes one rotation. It partially overlaps the moving circular movement path. Thus, during one rotation of the compound gear 40, the compound gear side protrusion 44b of the compound gear 40 abuts the cutter blade returning protrusion 50b for a predetermined period of time, thereby combining the cutter blade returning protrusion 50b. The gear 40 is moved in the rotation direction D1. The period in which the compound gear side protrusion 44b of the compound gear 40 abuts the cutter blade return protrusion 50b is a period in which the meshing of the transmission gear 51 and the intermittent gear 43a of the compound gear 40 is released. While the gear 51 and the intermittent tooth portion 43a of the compound gear 40 are engaged, the compound gear side protrusion 44b of the compound gear 40 and the cutter blade returning protrusion 50b do not contact each other.

  Here, during the period when the compound gear 40 to which the rotation of the drive motor 31 is transmitted is rotated once and the intermittent gear portion 43a of the compound gear 40 and the transmission gear 51 are engaged, the rotation of the compound gear 40 is performed. Is transmitted from the transmission gear 51 to the drive gear 32 via the cutter blade returning gear 50. As a result, the drive gear 32 rotates by a specified rotation angle in the first rotation direction R1. As a result, the first cutter blade 21 moves from the retreat position 21B to the advance position 21A.

  On the other hand, while the compound gear 40 to which the rotation of the drive motor 31 has been transmitted is rotated once, the compound gear 40 of the compound gear 40 is disengaged between the intermittent gear 43a of the compound gear 40 and the transmission gear 51. During the period in which the gear side protrusion 44b and the cutter blade return protrusion 50b of the cutter blade return gear 50 are in contact with each other, the rotation of the composite gear 40 causes the compound gear side protrusion 44b and the cutter blade return protrusion to rotate. It is transmitted to the cutter blade returning gear 50 via 50b. As a result, the compound gear 40 rotates the cutter blade returning gear 50, and the cutter blade returning gear 50 rotates in the direction opposite to that in the case where the rotation of the compound gear 40 is transmitted via the transmission gear 51. . As a result, the drive gear 32 rotates in the second rotation direction R2 by a specified rotation angle during the period in which the compound gear side protrusion 44b and the cutter blade return protrusion 50b are in contact with each other. Accordingly, the first cutter blade 21 returns from the advance position 21A to the retract position 21B.

  The pair of coil springs 35 extend in the front-rear direction Y of the printer at positions spaced apart in the printer width direction X. Each coil spring 35 has a front end portion attached to the rack member 27 and a rear end portion attached to the door side frame 28. Each coil spring 35 expands and accumulates an urging force as the first cutter blade 21 moves from the retreat position 21B to the advance position 21A. Therefore, the first cutter blade moving mechanism 24 moves the first cutter blade 21 from the retracted position 21B to the advanced position 21A against the biasing force of each coil spring 35. Further, each coil spring 35 is configured so that when the first cutter blade moving mechanism 24 moves the first cutter blade 21 from the advance position 21A to the retract position 21B, the first cutter blade 21 moves backward by the accumulated biasing force. Assist the movement to the position 21B.

  Here, the platen roller 17, the upstream transmission mechanism 41 (the transmission gear 51 and the cutter blade return gear 50) of the first cutter blade moving mechanism 24, the drive gear 32, the rack member 27, the first cutter blade 21, and the coil spring. 35 is supported by the door side frame 28. Accordingly, the platen roller 17, the upstream transmission mechanism 41, the drive gear 32, the rack member 27, the first cutter blade 21, and the coil spring 35 rotate together with the opening / closing door 8 to open the case body when the opening / closing door 8 is opened. 6 apart.

(Second cutter blade movement mechanism)
As shown in FIG. 4, the second cutter blade 22 faces the retracted position 21 </ b> B of the first cutter blade 21 (toward the printer rear Y <b> 2) at the rubbing position 22 </ b> A that can be in rubbing contact with the first cutter blade 21. The inclined posture is inclined in a direction approaching the moving surface 23 of the first cutter blade 21. In the inclined posture, the cutting edge 22 a of the second cutter blade 22 is on the moving surface 23. The second cutter blade moving mechanism 25 moves the second cutter blade 22 from the rubbing position 22A to the separation position 22B by displacing the blade edge 21a downward from the moving surface 23 rather than the inclined posture.

  The second cutter blade moving mechanism 25 is configured below the moving surface 23 of the first cutter blade 21. As shown in FIGS. 3 and 4, the second cutter blade moving mechanism 25 includes a support mechanism 55 that supports the second cutter blade 22 so as to be swingable about a predetermined rotation axis, and a first cutter blade moving mechanism 24. A link mechanism 56 that swings the second cutter blade 22 in synchronization with the movement of the first cutter blade 21 is provided.

  The support mechanism 55 rubs the second cutter blade 22 by urging the support frame 29, the support frame 29 on which the second cutter blade 22 is mounted, the support shaft 58 that supports the support frame 29 in a swingable manner. A biasing member 59 that biases the position 22A is provided. In this example, the urging member 59 is a coil spring.

  As shown in FIG. 3, the support frame 29 extends in the printer width direction X to support the second cutter blade 22 from below, and the end of the cutter support portion 61 on one X1 side in the printer width direction X. A link frame portion 62 extends downward from the portion. The link frame portion 62 includes a front frame portion 62a extending downward, an intermediate frame portion 62b extending from the lower end portion of the front frame portion 62a to the rear Y2, and a rear frame portion 62c extending upward from the rear end portion of the intermediate frame portion 62b. . A cam follower portion 29a capable of contacting the cam 44c of the compound gear 40 is provided at the upper end portion of the rear frame portion 62c.

  The support shaft 58 passes through the front upper end portion of the front frame portion 62a in the printer width direction X. The support shaft 58 is the rotation axis of the second cutter blade 22, and the center line of the support shaft 58 is the swing center line (rotation center line) of the second cutter blade 22. The urging member 59 is an upper end portion of the front frame portion 62a, and urges a front end portion located on the opposite side of the blade edge 21a of the second cutter blade 22 with the support shaft 58 interposed therebetween.

  The cam follower portion 29 a of the support frame 29 and the cam 44 c of the compound gear 40 constitute a link mechanism 56. During the period when the compound gear 40 makes one rotation and the cam follower portion 29a and the cam 44c of the compound gear 40 are not in frictional contact, the supporting frame 29 is rotated around the support shaft 58 by the biasing member 59 in FIG. It is urged counterclockwise S1 indicated by an arrow in FIG. When the support frame 29 is biased counterclockwise S1, the raised portion 21c of the second cutter blade 22 abuts on the raised portion 21c of the first cutter blade 21 from below. Accordingly, the second cutter blade 22 is disposed at the rubbing position 22A in an inclined posture. Further, in a state where the second cutter blade 22 is disposed at the rubbing position 22 </ b> A, the second cutter blade 22 is pressed against the first cutter blade 21 by the urging force of the urging member 59.

  On the other hand, when the composite gear 40 rotates and the cam follower portion 29a of the support frame 29 and the cam 44c of the composite gear 40 rub against each other, the rear frame portion 62c moves downward against the urging force of the urging member 59. Displace. As a result, the support frame 29 rotates about the support shaft 58 in the clockwise direction S2 indicated by an arrow in FIGS. As a result, the second cutter blade 22 is disposed at a separation position 22 </ b> B where the blade edge 21 a is spaced downward from the moving surface 23 and does not rub against the first cutter blade 21. The second cutter blade 22 is disposed at the separation position 22B during the period in which the cam follower portion 29a and the cam 44c of the composite gear 40 are in frictional contact with each other.

  Here, the second cutter blade moving mechanism 25 moves the second cutter blade 22 to the rubbing position 22A before the first cutter blade moving mechanism 24 moves the first cutter blade 21 from the retracted position 21B to the advanced position 21A. Deploy. Further, the second cutter blade moving mechanism 25 arranges the second cutter blade 22 in the separation position 22B before the first cutter blade moving mechanism 24 moves the first cutter blade 21 from the advance position 21A to the retract position 21B. .

(Cutting operation)
Next, the cutting operation of the recording paper 3 by the cutter 15 will be described with reference to FIGS. FIG. 5 shows the standby state of the cutter 15. FIG. 6 shows a state immediately before the first cutter blade 21 starts moving. FIG. 7 shows a state in which the first cutter blade 21 has reached the advance position 21A. FIG. 8 shows the state of the cutter 15 immediately after cutting the recording paper 3. FIG. 9 shows a state where the first cutter blade 21 has reached the retracted position 21B. (A) of each figure is a top view of the cutter 15, (b) of each figure is the longitudinal cross-sectional view which cut | disconnected the cutter 15 in the surface which passes the pinion 37 of the rotation linear motion conversion mechanism 33, (C) is a side view of the cutter 15, and (d) in each figure is a partially enlarged view around the compound gear 40. In (c) and (d) of each figure, these are described so that the positions of the intermittent tooth portion 43a, the compound gear side protrusion 44b, the cutter blade return protrusion 50b, the cam 44c and the cam follower portion 29a can be clearly understood. doing.

  First, when the printer 1 is in a power-off state, or when the printer 1 is in a standby state waiting for supply of print data, the cutter 15 is in a standby state. In the standby state, as shown in FIG. 5A, the first cutter blade 21 is disposed at the retracted position 21B. As shown in FIG. 5B, the pinion 37 that is coaxial with the drive gear 32 meshes with the front end portion of the rack 27 a of the rack member 27. As shown in FIGS. 5C and 5D, the intermittent tooth portion 43 a of the compound gear 40 is disposed at an angular position that is separated from the transmission gear 51 and is not meshed with the transmission gear 51. The cutter blade return projection 50b of the cutter blade return gear 50 is located away from the movement path of the composite gear side projection 44b of the composite gear 40, and the composite gear side projection 44b is connected to the cutter blade return projection 50b. Are not in contact. On the other hand, the cam follower portion 29a of the support frame 29 that supports the second cutter blade 22 is in contact with the cam 44c of the compound gear 40 as shown in FIG. As a result, the rear frame portion 62 c of the support frame 29 is pushed downward against the urging force of the coil spring 35, and the second cutter blade 22 is disposed at a separation position 22 </ b> B that is separated from the first cutter blade 21. .

  When print data is supplied from an external device, the printer 1 drives the conveyance motor 18 to rotate the platen roller 17 and conveys the recording paper 3 set along the conveyance path 16 at a constant speed. In addition, the printer 1 drives the print head 14 to print on the recording paper 3 conveyed at the printing position A. When printing is completed, the printer 1 drives the drive motor 31 to rotate in the same direction for a specified drive time. Accordingly, the cutter 15 is operated to cut the recording paper portion of the recording paper 3 that has been printed.

  When the drive motor 31 is driven, the compound gear 40 starts to rotate in the rotation direction D1 (clockwise). Immediately after the rotation of the compound gear 40, the contact between the cam follower portion 29a of the support frame 29 and the cam 44c of the compound gear 40 is released. Accordingly, the support frame 29 is rotated counterclockwise S1 around the support shaft 58 by the urging force of the urging member 59 (see FIG. 6C). As a result, the second cutter blade 22 moves to a rubbing position 22 </ b> A that can be in rubbing contact with the first cutter blade 21.

  Thereafter, when the compound gear 40 further rotates, as shown in FIG. 6, the intermittent tooth portion 43 a of the compound gear 40 meshes with the transmission gear 51 after a predetermined time has elapsed since the drive start time of the drive motor 31. In this example, the intermittent tooth portion 43a meshes with the transmission gear 51 after rotating around the rotation axis of the compound gear 40 by 90 ° or more. When the intermittent tooth portion 43a of the compound gear 40 and the transmission gear 51 are engaged with each other, the transmission gear 51 rotates counterclockwise as shown in FIG. 6 (d). Further, the cutter blade returning gear 50 meshed with the transmission gear 51 rotates clockwise. Then, the drive gear 32 meshed with the cutter blade return gear 50 rotates in the first counterclockwise rotation direction R1. While the intermittent gear portion 43a of the compound gear 40 is engaged with the transmission gear 51, the drive gear 32 rotates by a specified rotation angle in the first rotation direction R1.

  The rotation of the drive gear 32 at the specified rotation angle in the first rotation direction R1 is converted by the rotation / linear motion conversion mechanism 33 into the linear motion of the first cutter blade 21 toward the front Y1. Accordingly, the first cutter blade 21 moves by a specified distance from the retreat position 21B toward the advance position 21A. Thereby, the first cutter blade 21 passes through the cutting position B of the conveyance path 16 while rubbing the blade portion 21b against the blade portion 22b of the second cutter blade 22, and reaches the advance position 21A. As a result, the recording paper 3 arranged at the cutting position B is cut.

  When the first cutter blade 21 reaches the forward movement position 21A, the meshing of the compound gear 40, the intermittent tooth portion 43a, and the transmission gear 51 is released as shown in FIG. As a result, the rotation of the compound gear 40 is not transmitted to the drive gear 32, so that the first cutter blade 21 stops its movement at the advance position 21A. In a state where the first cutter blade 21 is disposed at the forward movement position 21 </ b> A, the drive gear 32 meshes with the rear end portion of the rack 27 a of the rack member 27. In addition, while the 1st cutter blade 21 moves to the advance position 21A, the coil spring 35 expand | extends and accumulate | stores urging | biasing force.

  Here, as shown in FIGS. 7C and 7D, in the cutter blade return gear 50 that transmits the rotation of the transmission gear 51 to the drive gear 32, the first cutter blade 21 advances from the retracted position 21B. While moving to the position 21A (while the compound gear 40, the intermittent tooth portion 43a and the transmission gear 51 are engaged), the cutter blade returning projection 50b is moved to the compound gear side projection 44b of the compound gear 40. It is located on the route.

  Thereafter, when the compound gear 40 further rotates, as shown in FIG. 8, the cam 44c of the compound gear 40 and the cam follower portion 29a of the support frame 29 that supports the second cutter blade 22 rub against each other. As a result, as shown in FIG. 8C, the rear frame portion 62c of the support frame 29 is pushed downward, and the support frame 29 swings around the support shaft 58 clockwise S2. As a result, the second cutter blade 22 moves to a separation position 22 </ b> B that is separated from the first cutter blade 21.

  And after the 2nd cutter blade 22 is arrange | positioned in the separation position 22B, the compound-gear side protrusion 44b of the compound gear 40 contact | abuts to the cutter blade return protrusion 50b of the cutter blade return gear 50. FIG. At the time when the compound gear side protrusion 44b and the cutter blade return protrusion 50b come into contact with each other, the meshing between the intermittent gear 43a of the compound gear 40 and the transmission gear 51 is released. Accordingly, the cutter blade returning gear 50 is rotatable, and the cutter blade returning gear 50 is moved along with the compound gear 40 during the period in which the contact between the compound gear side protrusion 44b and the cutter blade returning protrusion 50b is maintained. Turn around. As a result, the cutter blade returning gear 50 rotates counterclockwise as shown in FIG. 8D to rotate the drive gear 32 in the second clockwise rotation direction R2. The drive gear 32 rotates in the second rotation direction R2 by a specified rotation angle while the contact between the compound gear side protrusion 44b and the cutter blade return protrusion 50b is maintained.

  The rotation of the drive gear 32 at the specified rotation angle in the second rotation direction R2 is converted by the rotation / linear motion conversion mechanism 33 into the linear motion of the first cutter blade 21 toward the printer rear Y2. Accordingly, the first cutter blade 21 moves by a specified distance from the advance position 21A toward the retract position 21B. Moreover, when the 1st cutter blade 21 moves to the retreat position 21B, the urging | biasing force of the coil spring 35 assists the movement.

  Thereafter, the composite gear 40 further rotates, and the cutter blade return projection 50b of the cutter blade return gear 50 deviates from the movement path of the composite gear side projection 44b of the composite gear 40 as shown in FIG. Is released, the contact between the compound gear side projection 44b and the cutter blade return projection 50b is released. Thereby, since the counterclockwise rotation of the cutter blade returning gear 50 is stopped, the rotation of the drive gear 32 in the second rotation direction R2 is also stopped. As a result, the first cutter blade 21 stops moving at the retracted position 21B. In a state where the first cutter blade 21 is disposed at the retracted position 21 </ b> B, the drive gear 32 meshes with the front end portion of the rack 27 a of the rack member 27.

  Thereafter, the drive motor 31 stops. That is, after the first cutter blade 21 is disposed at the retracted position 21B, the drive time of the drive motor 31 reaches the specified drive time, and the drive motor 31 stops. Thereby, the cutter 15 returns to the standby state shown in FIG.

  In the standby state shown in FIG. 5, the intermittent tooth portion 43 a of the compound gear 40 is disposed at an angular position away from the transmission gear 51 and is not meshed with the transmission gear 51. The cutter blade return projection 50b of the cutter blade return gear 50 is located away from the movement path of the composite gear side projection 44b of the composite gear 40, and the composite gear side projection 44b is connected to the cutter blade return projection 50b. Are not in contact. On the other hand, the cam follower portion 29 a of the support frame 29 that supports the second cutter blade 22 is in contact with the cam 44 c of the compound gear 40. As a result, the rear frame portion 62 c of the support frame 29 is pushed downward against the urging force of the coil spring 35, and the second cutter blade 22 is disposed at a separation position 22 </ b> B that is separated from the first cutter blade 21. .

  Here, when the printer 1 is in the standby state, the platen roller 17, the first cutter blade 21, the rack member 27, and the drive gear are opened when the opening / closing door 8 is opened and placed in the open position 8B for loading the roll paper 2. 32, the upstream transmission mechanism 41 (the cutter blade return gear 50 and the transmission gear 51) and the coil spring 35 move together with the open / close door 8, but the intermittent tooth portion 43a of the compound gear 40 does not mesh with the transmission gear 51 in the standby state. In position. Accordingly, the opening operation for opening the door 8 is not hindered by the engagement of the transmission gear 51 and the intermittent tooth portion 43a of the compound gear 40.

  Further, in the standby state, the intermittent gear portion 43a of the composite gear 40 is in a position where it does not mesh with the transmission gear 51, and the composite gear side projection 44b is in a position where it does not contact the cutter blade return projection 50b. Therefore, during the closing operation of moving the open / close door 8 from the open position 8B to the blocking position 8A, the transmission gear 51 and the intermittent tooth portion 43a of the composite gear 40 do not collide, and the cutter blade return protrusion 50b and the composite gear side protrusion. The part 44b does not collide. Furthermore, since the 2nd cutter blade 22 is arrange | positioned in the separation position 22B, the blade part 22b of the 2nd cutter blade 22 is located below rather than the moving surface 23 of the 1st cutter blade 21. FIG. Therefore, even when the open / close door 8 is disposed at the open position 8B, the blade portion 22b of the second cutter blade 22 does not protrude upward from the case body 6 and is safe.

(Function and effect)
In this example, when the compound gear side protrusion 44b of the compound gear 40 to which the rotation of the drive motor 31 is transmitted contacts the cutter blade return protrusion 50b of the cutter blade return gear 50, the contact is maintained. During this period, the cutter blade returning gear 50 is rotated with the compound gear 40 to rotate the drive gear 32 by the specified rotation angle in the second rotation direction R2. Thereby, the 1st cutter blade 21 moves from the advance position 21A to the retreat position 21B. Therefore, the first cutter blade 21 can be stopped at the retracted position 21B without stopping the drive motor 31. Therefore, the 1st cutter blade 21 concerned with the shift | offset | difference of the stop position of the drive motor 31 can be arrange | positioned correctly in the reverse position 21B.

  Further, in this example, during the period in which the intermittent tooth portion 43a of the compound gear 40 and the transmission gear 51 are engaged, the drive gear 32 rotates by a specified rotation angle in the first rotation direction R1, thereby the first cutter blade. 21 moves from the retreat position 21B to the advance position 21A. Thus, in this example, the 1st cutter blade 21 can be accurately moved between the forward movement position 21A and the backward movement position 21B. Therefore, it is not necessary to ensure the stroke of the first cutter blade 21 larger than necessary. Therefore, the cutter 15 can be reduced in size.

  Further, in this example, the cutter blade returning projection 50b is provided on the outer peripheral side of the intermittent gear 43a in the composite gear 40. Thereby, the circumferential speed at which the cutter blade returning projection 50b moves is faster than the circumferential speed of the intermittent tooth portion 43a. Accordingly, the first cutter blade moving mechanism 24 moves the first cutter blade 21 from the advance position 21A to the retract position 21B at a higher speed than the speed at which the first cutter blade 21 is moved from the retract position 21B to the advance position 21A. Can be returned to.

  In this example, a rack and pinion mechanism is employed as the rotation / linear motion conversion mechanism 33 that moves the first cutter blade 21. According to the rack and pinion mechanism, the rotation angle of the drive gear 32 and the movement distance of the first cutter blade 21 can be made to correspond to each other. Therefore, compared to the case where a link mechanism is used for the rotation / linear motion conversion mechanism 33, One cutter blade 21 can be moved accurately.

(Modification)
In the present invention, the drive gear 32 may also serve as the transmission gear 51. That is, the intermittent gear 43 a of the compound gear 40 may be engaged with the drive gear 32. In this way, since the transmission gear 51 can be omitted, the number of parts can be reduced.

1..Printer, 2..Roll paper, 3 .... Recording paper (medium), 4 .... Printer case, 5 .... Discharge port, 6 .... Case body, 7 .... Roll paper storage, 7a ... Roll Paper slot, 8 ·· Opening / closing door, 8A ·· Opening / closing door closing position, 8B ·· Opening / closing door opening position, 9 ·· Opening / closing button, 10 ·· Power switch, 14 ·· Print head, 15 ·· Cutter , 16 ·· Conveying path, 17 ·· Platen roller, 18 ·· Conveying motor, 21 ·· First cutter blade, 21a ·· Cutting edge of the first cutter blade, 21b ·· Blade portion of the first cutter blade, 21c ·・ Climbing part of the first cutter blade, 21A ・ ・ Advance position of the first cutter blade, 21B ・ ・ Retraction position of the first cutter blade, 22 ・ ・ Second cutter blade, 22a ・ ・ Cutting edge of the second cutter blade, 22b ..Blade part of the second cutter blade, 22c Riding portion of the utter blade, 22A..Rubbing position of the second cutter blade, 22B..Separation position of the second cutter blade, 23..Moving surface of the first cutter blade, 24..First cutter blade moving mechanism. , 25 ·· second cutter blade moving mechanism, 27 ·· rack member, 27a ·· rack, 28 ·· door side frame, 29 ·· support frame, 29a ·· cam follower part, 31 ·· drive motor, 32 · · Drive gears, 33 · · Rotational linear motion conversion mechanism, 34 · · Transmission mechanism, 35 · · Coil spring (biasing member), 37 · · Pinion of rotational linear motion conversion mechanism, 38 · · Pinion, 40 · · Compound gear (Intermittent gear), 41 ··· upstream transmission mechanism, 42 ··· downstream transmission mechanism, 43 ·· intermittent gear portion, 43a ··· intermittent tooth portion (tooth portion), 44 · · large gear portion, 44a ··· Tooth part of large-diameter gear part, 44b..Composite gear Projection (contact part), 44c ·· cam, 46 · · pinion, 47 · · worm, 48 · · clutch mechanism, 50 · · cutter blade return gear, 50a · · intermittent tooth portion of cutter blade return gear , 50b ··· Projector for returning cutter blade, ··· Transmission gear, 55 ·· Support mechanism, 56 ·· Link mechanism, 58 ·· Support shaft, 59 ·· Energizing member, 61 ·· Cutter support of support frame Part, 62 ... Link frame part of support frame, 62a ... Front frame part, 62b ... Intermediate frame part, 62c ... Rear frame part, A ... Printing position, B ... Cutting position, F1 ... With Urging force of the urging member, F2... Recording paper cutting load, R1... First rotation direction, R2 .. second rotation direction, X... Printer width direction, X1. Longitudinal direction, Y1 ... pudding Front of the printer front and rear, Y2 ··· rear of the printer front and rear, Z · ·

Claims (6)

In the cutter blade drive mechanism for reciprocating the cutter blade between the advance position for cutting the sheet-like medium and the retract position separated from the advance position,
A drive gear, a rotation / linear motion conversion mechanism for converting rotation of the drive gear into linear motion and moving the cutter blade back and forth, a drive motor, and a transmission mechanism for transmitting the rotation of the drive motor to the drive gear;
The transmission mechanism includes a cutter blade return gear that rotates together with the drive gear, and a transmission gear that transmits the rotation of the drive motor,
The cutter blade returning gear includes a protrusion at a position spaced radially from the rotation axis thereof,
It is a structure in which the movement of the cutter blade is regulated by the movement of the abutting portion that can abut against the protrusion,
The cutter blade is moved from the retracted position to the advanced position by rotation of the drive gear in a first rotational direction in the first rotational direction, and in a second rotational direction opposite to the first rotational direction of the drive gear. The cutter blade drive mechanism moves from the advance position to the retract position by rotation of the specified rotation angle. In claim 1,
The cutter blade drive mechanism, wherein the rotation / linear motion conversion mechanism is a rack and pinion mechanism. In claim 1 or 2,
A cutter blade drive mechanism comprising a biasing member that biases the cutter blade from the forward movement position toward the backward movement position. In any one of claims 1 to 3,
The cutter blade drive mechanism, wherein the drive gear also serves as the transmission gear. The cutter blade drive mechanism according to any one of claims 1 to 4,
A first cutter blade that moves between the forward position and the backward position by the cutter blade drive mechanism;
And a second cutter blade capable of contacting the first cutter blade from the retracted position toward the advanced position. A cutter according to claim 5;
A print head;
A transport mechanism for transporting a sheet-like medium along a transport path passing through a printing position by the print head and a cutting position by the cutter;
A printer comprising:

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