Printer

Abstract

To provide a printer capable of moving a slitter part and rotationally driving a rotary blade by one motor.SOLUTION: A printer 1 includes; a motor 55; a slide screw shaft 57 rotated around an axis by rotation of the motor 55; a slide nut 59 which is engaged with the slide screw shaft 57 in a posture in which the rotation around the axis is regulated, moves in an advancing direction along the slide screw shaft 57 by the rotation of the slide screw shaft 57 in one direction to advance to a predetermined position, and after the advance is stopped by abutting on a predetermined member at a predetermined position, the slide nut rotates around the axis integrally with the rotation of the slide screw shaft 57; and a slitter part 25 having a pair of rotary blades 71, which moves along the slide screw shaft 57 integrally with the slide nut 59, and which is rotationally driven by the rotation of the slide nut 59 around the shaft, and cuts a paper sheet passing in a carrying direction orthogonal to an axial direction along the carrying direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a printer.

Background Art

[0002] There is a printer having a slitter function that, without preparing a plurality of paper types, cuts the paper after printing on a paper with a large width dimension to adjust it to a desired small width dimension in order to obtain a printed output with different width dimensions.

[0003] For example, the printer described in Patent Document 1 includes a slitter unit (14) having a frame (40) and a rotary blade (driving side round blade (27) and driven side round blade (21)) disposed on the frame (40). The frame (40) is moved to a desired position by a pulse motor (50), and the paper is cut by the rotary blade that rotates by the rotation of the motor 32.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The printer described in Patent Document 1 includes two motors, a motor for moving the frame of the slitter unit in the width direction and a motor for driving the rotary blade. Since the motors are expensive, there is a need to reduce the number of motors used.

[0006] An object of the present invention is to provide a printer that enables the movement of the slitter unit and the rotational drive of the rotary blade with one motor.

Means for Solving the Problems

[0007] To achieve the above object, the printer of the present invention includes a motor, a round bar member having a male thread formed on its outer peripheral surface, a sliding screw shaft that rotates around an axis by the rotation of the motor, a female thread formed on the inner peripheral surface, and the sliding screw shaft is screwed into the sliding screw shaft in a posture where the rotation around the axis is restricted. When the sliding screw shaft rotates in one direction, it moves in the advancing direction along the sliding screw shaft to reach a predetermined position, and after the advancement is stopped by hitting a predetermined member at the predetermined position, a sliding nut that rotates around the axis integrally with the rotation of the sliding screw shaft, and a member that moves along the sliding screw shaft integrally with the sliding nut and is rotationally driven by the rotation of the sliding nut around the axis, and a slitter unit having a set of rotary blades including a driving rotary blade and a driven rotary blade that cut a sheet passing in the conveyance direction orthogonal to the axial direction along the conveyance direction.

Advantages of the Invention

[0008] By the rotation of the motor, the sliding nut advances to a predetermined position, and at the same time, the slitter unit also moves. When the sliding nut reaches the predetermined position, a set of rotary blades is rotationally driven on the spot, and the passing sheet can be cut. In this way, with one motor, it becomes possible to move the slitter unit and rotationally drive the rotary blades.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the printer according to the present invention will be described with reference to the drawings.

[0011] <Overall Configuration> FIG. 1 is a perspective view showing the appearance of the printer 1, and FIG. 2 is a cross-sectional view taken along a vertical plane passing through the center in the width direction W of the printer 1 and along the front-rear direction L.

[0012] As shown in FIG. 1, the printer 1 is integrally formed in a rectangular parallelepiped shape and includes a main body 3 and a dustbin 5. In the present embodiment, as shown in FIG. 1, the left-right direction (width direction) W, the front-rear direction (length direction) L, and the up-down direction (height direction) H are defined.

[0013] The main body 3 is formed by covering the outside of a metal frame with a metal exterior cover 7, a resin upper front case 9, and a lower front case 11. Inside the main body 3, as shown in FIG. 2, there are formed a roll paper storage chamber 13 for storing a roll paper 12, a single-sheet paper storage chamber 15 for storing single-sheet papers 14, and a ribbon storage chamber 17 for storing an ink ribbon unit 16.

[0014] The roll paper storage chamber 13 stores a roll paper 12 in which a long strip-shaped paper 12A is wound in a roll shape. The roll paper 12 can be replaced by pulling it out from the exterior cover 7 to the main body 3, then flipping up the upper front part of the main body 3 provided with the upper front case 9, and removing the dustbin 5.

[0015] As shown in Fig. 2, the single-sheet paper storage chamber 15 is provided at the lowermost part of the printer 1 and is disposed below the roll paper storage chamber 13. The single-sheet paper storage chamber 15 stores single-sheet papers 14 that have been cut to a predetermined size in the thickness direction in a stacked manner and supplies the paper 14A.

[0016] The single-sheet paper storage chamber 15 is covered by the lower front case 11, and by hanging a finger on the finger hook portion 11a formed on the upper part of the lower front case 11 and pulling it forward in the front-rear direction L, it is provided so as to be independently pulled forward from the main body portion 3. The single-sheet paper storage chamber 15 is open at the top when pulled forward, and the single-sheet paper 14 stored inside can be taken in and out from this open top.

[0017] The upper front case 9 is disposed at the upper front part of the main body portion 3. The upper front case 9 is disposed opposite to the cutter unit 19 and the slitter unit 21 disposed at the upper front part of the main body portion 3 and covers the cutter unit 19 and the slitter unit 21.

[0018] On the front surface of the upper front case 9, a discharge port 23 for discharging the papers 12A, 14A conveyed from the inside of the main body portion 3 to the outside is formed. The discharge port 23 is formed with a dimension longer than the width of the papers 12A, 14A. A recess 23A is formed in the discharge port 23 so that a portion 29 of the slitter portion 25 described later is exposed. The exposed portion 29 is movable in the left-right direction within the recess 23A. When the paper is not slit, the exposed portion 29 comes to the left end of the recess 23A, and when the paper is slit, the exposed portion 29 comes to the right end of the recess 23A.

[0019] In addition to these roll paper storage chamber 13, single-sheet paper storage chamber 15, and ribbon storage chamber 17, the main body portion 3 is provided with a power source, a paper conveyance unit, a ribbon conveyance unit, a cutter unit 19, a slitter unit 21, a control unit, and the like.

[0020] The dustbin 5 is detachably provided on the main body 3 so as to close the front opening of the main body 3. As shown in FIG. 1, the dustbin 5 is engaged with the main body 3 in a closed state to maintain the closed state, and can be disengaged by pulling forward and removed from the main body 3. Further, when the dustbin 5 is pressed against the rear R from the state of being removed from the main body 3, the dustbin 5 is engaged with and attached to the main body 3 and maintained in the attached state.

[0021] The dustbin 5 is formed in a box shape with an open upper end and having an internal space 5a. The opening 5b at the upper end of the dustbin 5 faces the cutter unit 19.

[0022] When the cutter unit 19 cuts off the margins of the sheets 12A, 14A as strip-shaped pieces of paper elongated in the width direction W of the sheets 12A, 14A, the pieces of paper fall and are accommodated in the internal space 5a of the dustbin 5 through the opening 5b.

[0023] The main body 3 is provided with an ink ribbon section IR for transporting the ink ribbon T of the ink ribbon unit 16 accommodated in the ribbon accommodation chamber 17. The ink ribbon T is a belt-shaped sheet in which the ink regions of yellow Y, magenta M, and cyan C, and the overcoat OP region are repeatedly arranged alternately in the longitudinal direction. The ink ribbon unit 16 can be replaced by pulling out the main body 3 from the exterior cover 7.

[0024] The main body 3 is provided with a transport mechanism 31 for transporting the sheet 12A from the roll paper accommodation chamber 13 along the transport path CP and for transporting the sheet 14A from the single-sheet paper accommodation chamber 15 along the transport path CP. The transport path CP is the path of the dashed-dotted line shown in FIG. 2. In the present embodiment, the transport direction from the paper supply positions (roll paper accommodation chamber 13 and single-sheet paper accommodation chamber 15) to the discharge port 23 is defined as the forward direction, and the reverse is defined as the reverse direction. The sheets 12A, 14A are transported forward and backward along the transport path CP by the transport mechanism 31 and finally discharged from the discharge port 23.

[0025] The conveyance path CP has a roll paper feeding path P1, a sheet-fed paper feeding path P2, a paper feeding path P3, a reversing path P4, a printing path P5, and a paper discharging path P6. The conveyance mechanism 31 includes a roll paper feeding roller 33, a sheet-fed paper feeding roller 35, a sheet-fed paper supply roller 37, a grip roller 39, a platen roller 41, a reversing roller 43, a cutter unit roller 45, and a slitter unit roller 47 along the conveyance path CP.

[0026] The roll paper feeding roller 33 conveys the paper 12A extending from the roll paper 12 to the grip roller 39 while sandwiching the paper 12A. The sheet-fed paper feeding roller 35 contacts the topmost stacked sheet-fed paper 14 and feeds out the sheet-fed paper 14 by rotation. The sheet-fed paper supply roller 37 is disposed near the sheet-fed paper feeding roller 35 and conveys the fed paper 14A to the grip roller 39 via the paper feeding path P3. The grip roller 39 advances the papers 12A and 14A forward while sandwiching them and conveys them to the printing path P5. During printing, the grip roller 39 advances the papers 12A and 14A in the reverse direction. Also, when printing on both sides of the paper 14A (sheet-fed paper), the paper 14A is advanced to the reversing path P4. The platen roller 41 is disposed at a position facing a thermal head described later and supports the papers 12A and 14A against which the ink ribbon is pressed.

[0027] The reversing roller 43 is driven when printing on both sides of the paper 14A (sheet-fed paper). When printing on the back side, the paper 14A is conveyed by the grip roller 39 to the reversing path RP of the conveyance path CP, and then advanced to the paper feeding path P3 by the reversing roller 43.

[0028] The cutter unit roller 45 is provided in the cutter unit 19 and advances the papers 12A and 14A to a predetermined position and holds them so as not to shift during cutting when cutting the margins of the papers 12A and 14A or when separating the paper 12A from the roll paper 12.

[0029] The slitter unit roller 47 is provided in the slitter unit 21 and advances the sheets 12A and 14A toward the discharge port 23. As will be described later, when slitting the sheets 12A and 14A, the slitter unit 25 is moved to the conveyance path to discharge the sheets 12A and 14A while cutting them.

[0030] A thermal head 49 is disposed at a position facing the platen roller 41. The thermal head 49 is disposed on the side opposite to the transfer surface of the ink ribbon T stretched by the guide portion 51, presses the ink ribbon T stretched by the guide portion and fed out in synchronization with the sheets 12A and 14A against the sheets 12A and 14A being conveyed along the conveyance path CP, and transfers the ink on the transfer surface to the sheets 12A and 14A by heat to perform printing.

[0031] <Slitter unit> FIG. 3 is a perspective view of the slitter unit 21 removed from the main body 3, FIG. 4 is a front view of the slitter unit 21, FIG. 5 is a sectional view taken along line V-V shown in FIG. 4, FIG. 6 is a sectional view taken along line VI-VI shown in FIG. 4, FIG. 7 is a sectional view taken along line VII-VII shown in FIG. 4, and FIG. 8 is a perspective view of the slide nut.

[0032] The slitter unit 21 includes a unit frame body 53, a slitter unit roller 47, a motor 55, a ball screw shaft 57, a slide nut 59, and a slitter unit 25.

[0033] The unit frame body 53 is a metal frame body. The slitter unit roller 47, the motor 55, the ball screw shaft 57, the slide nut 59, and the slitter unit 25 are attached to the unit frame body 53, and the slitter unit 21 can be removed from the main body 3 by removing the unit frame body 53 from the main body 3.

[0034] The slitter unit roller 47 has a driving roller 47A and a driven roller 47B. When the slitter unit 21 is attached to the main body 3, the sheets 12A and 14A conveyed by the cutter unit roller 45 are sandwiched between the driving roller 47A and the driven roller 47B and advanced toward the discharge port 23.

[0035] The motor 55 is fixed to the unit frame 53 with its output shaft extending in the left - right direction W. As shown in FIG. 5, a pinion gear 61 is fixed to the output shaft of the motor 55 and rotates along with the rotation of the output shaft of the motor 55.

[0036] The ball screw shaft 57 is a round bar member having a male thread formed on its outer peripheral surface. It is fixed to the unit frame 53 in a posture extending in the left - right direction W parallel to the output shaft of the motor 55. The left end 57A of the ball screw shaft 57 is fixed to the unit frame 53 via a bearing 63, and the right end 57B is fixed to the unit frame 53 via a bearing 64. The bearings 63 and 64 have outer rings 63A and 64A fixed to the unit frame 53 and inner rings 63B and 64B fixed to the ball screw shaft 57. Thus, the ball screw shaft 57 is rotatably held around an axis extending in the left - right direction.

[0037] As shown in FIGS. 4 and 5, a drive gear 65 is fixed to the left - end 57A side of the ball screw shaft 57. The drive gear 65 transmits the rotation of the pinion gear 61 to the ball screw shaft 57 via an idler gear 67. Thus, the ball screw shaft 57 rotates in the same direction as the output shaft of the motor 55.

[0038] As shown in FIG. 8, the ball nut 59 is cylindrical with a female thread formed on its inner peripheral surface. A gear 59A is provided on the outer periphery of the ball nut 59, and the remaining part is a smooth surface 59B. A torsion spring (elastic member) 69 is wound around the smooth surface 59B. The tip 59C of the ball nut 59 is tapered.

[0039] The sliding nut 59 is screwed onto the ball screw shaft 57 in a posture where rotation around the axis is restricted due to the load caused by the friction of the contact between the driving rotary blade and the driven rotary blade, which will be described later (see Fig. 6). When the ball screw shaft 57 rotates clockwise (in one direction) as shown in Fig. 5, the sliding nut 59 moves in the advancing direction (right direction) along the ball screw shaft 57, and when it rotates counterclockwise (in the opposite direction), it moves in the retracting direction (left direction) along the ball screw shaft 57. The sliding nut 59 is housed within the slitter section 25, and as the sliding nut 59 moves, the slitter section 25 is configured to move along the ball screw shaft 57.

[0040] When the sliding nut 59 moves in the advancing direction and reaches a predetermined position, the tip 59C abuts against the end face of the inner ring 64B of the bearing 64 (a predetermined member), thereby stopping the advancement. After the advancement is stopped, when a torque exceeding the load caused by the friction of the contact between the driving rotary blade 71A and the driven rotary blade 71B is applied from the ball screw shaft 57, it rotates about the axis in the clockwise direction integrally with the rotation of the ball screw shaft 57.

[0041] The slitter section 25 has a set of rotary blades 71 composed of a driving rotary blade 71A and a driven rotary blade 71B, an idle gear 73, and a case 75.

[0042] The driving rotary blade 71A is integrated with the driving gear 77. The gear 59A of the sliding nut 59, the idle gear 73, and the driving gear 77 form a gear train, and when the sliding nut 59 rotates, the driving rotary blade 71A rotates clockwise. The driven rotary blade 71B is in contact with a part of the driving rotary blade 71A in a state biased by a spring (not shown), and rotates together with the driving rotary blade 71A when the driving rotary blade 71A rotates.

[0043] The case 75 has a storage section 75A, a first paper passage section 75B, and a second paper passage section 75C.

[0044] The storage portion 75A is formed with a hole 75D through which the sliding screw shaft 57 passes, and houses a sliding nut 59, a pair of rotary blades 71, and an idle gear 73. One end 69A of a torsion spring 69 wound around the sliding nut 59 is fixed within the storage portion 75A. When the sliding nut 59 rotates clockwise (in one direction), it stores energy and biases counterclockwise (in the opposite direction).

[0045] As shown in FIG. 6, in the first paper passage portion 75B, the portion where the driving rotary blade 71A and the driven rotary blade 71B of the pair of rotary blades 71 are in contact is exposed, and the paper portions (papers 12A´, 14A´) whose width dimensions have been adjusted by being cut by the pair of rotary blades 71 can pass along the conveyance path CP (paper discharge path P6).

[0046] In the second paper passage portion 75C, the unnecessary portions (papers 12A″, 14A″) of the papers 12A, 14A cut by the pair of rotary blades 71 are pushed down by the clockwise rotation of the driving rotary blade 71A during cutting and are discharged in a state of hanging down more than the papers 12A´, 14A´, and it has an inclined surface inclined toward the discharge port 23.

[0047] The slitter portion 25 is slidably fitted into a groove portion 53A (see FIG. 11) formed in the unit frame body 53 by a protrusion portion 76 (see FIGS. 9 and 10) provided on the lower surface of the case 75. Thereby, the slitter portion 25 moves along the sliding screw shaft 57 as the sliding nut 59 moves.

[0048] Next, the operation of the slitter unit 21 when slitting the papers 12A, 14A will be described with reference to FIGS. 9 to 11. FIG. 9 is a cross-sectional view along the sliding screw shaft in a state where the slitter portion is in the standby position, FIG. 10 is a cross-sectional view along the sliding screw shaft in a state where the slitter portion is in the cutting position, and FIG. 11 is a perspective view showing a state where the paper is discharged while being cut by the slitter portion.

[0049] When the sheets 12A and 14A are not slit, the slitter unit 25 is located at the standby position (the state shown in FIG. 9), and the sheets 12A and 14A are discharged from the discharge port 23 by the slitter unit roller 47.

[0050] When the sheets 12A and 14A are to be slit, the motor 55 rotates according to a command from the control unit, and the ball screw shaft 57 rotates. As a result, the ball nut 59 moves in the advancing direction together with the slitter unit 25. Then, when the ball nut 59 advances to a predetermined position, the tip portion 59C abuts against the end face of the inner ring 64B of the bearing 64 and starts to rotate integrally with the rotation of the ball screw shaft 57 (the state shown in FIG. 10). As a result, the driving rotary blade 71A and the driven rotary blade 71B rotate. In this state, when the sheets 12A and 14A are advanced by the slitter unit roller 47, as shown in FIG. 11, the sheets 12A and 14A are cut by the driving rotary blade 71A and the driven rotary blade 71B, adjusted to sheets having a desired width dimension, and then discharged from the discharge port 23. From the discharge port 23, unnecessary portions (sheets 12A″ and 14A″) are also discharged together with the sheets 12A and 14A (sheets 12A′ and 14A′) whose width dimensions have been adjusted. In the present embodiment, the width dimension of the sheets 12A and 14A is 8 inches (about 20.32 centimeters), and the sheets 12A′ and 14A′ cut by the slitter unit have a width dimension of 7 inches (about 17.78 centimeters).

[0051] When the paper discharge is completed, the motor 55 rotates in the reverse direction according to a command from the control unit. Then, the ball screw shaft 57 starts to rotate in the opposite direction, and the ball nut 59 is rotated in the opposite direction. At this time, the rotation of the ball nut 59 in the opposite direction is assisted by the torque in the opposite direction by the torsion spring 69. When the ball nut 59 rotates in the opposite direction, the ball nut 59 is separated from the bearing 64 and advances in the retracting direction. As a result, the slitter unit 25 returns to the standby position.

[0052] [Operation of the Printer] The operation of the printer 1 will be described below.

[0053] The printer 1 includes a motor 55, a round bar member having a male thread formed on its outer peripheral surface, a slide screw shaft 57 that rotates around the axis by the rotation of the motor 55, a female thread formed on the inner peripheral surface, and is screwed onto the slide screw shaft 57 in a posture where the rotation around the axis is restricted. When the slide screw shaft 57 moves in the advancing direction along the slide screw shaft 57 by the rotation in one direction and advances to a predetermined position and stops advancing by hitting a predetermined member at the predetermined position, a slide nut 59 that rotates around the axis integrally with the rotation of the slide screw shaft 57, and a drive rotary blade 71A and a driven rotary blade 71B that move along the slide screw shaft 57 integrally with the slide nut 59 and are rotationally driven by the rotation of the slide nut 59 around the axis, and a slitter unit 25 having a set of rotary blades 71 for cutting the paper passing in the conveyance direction orthogonal to the axial direction along the conveyance direction. It is characterized by including these components.

[0054] Due to the rotation of the motor, the slide nut advances to a predetermined position, and at the same time, the slitter unit also moves. When the slide nut reaches the predetermined position, the set of rotary blades is rotationally driven on the spot, and the passing paper can be cut. In this way, it becomes possible to move the slitter unit and rotationally drive the rotary blades with one motor.

[0055] The rotation of the slide nut 59 around the axis is restricted by the load due to the friction of the contact between the drive rotary blade 71A and the driven rotary blade 71B. When the advancement of the slide nut 59 stops by hitting the predetermined member at the predetermined position, a torque exceeding the load is applied to the slide nut 59 from the slide screw shaft 57, and the slide nut 59 may be configured to rotate around the axis. Since the load by the drive rotary blade and the driven rotary blade is used to restrict the rotation of the slide nut 59, there is no need to provide a separate member.

[0056] The sliding screw shaft 57 is supported by the inner ring 64B of a bearing 64 whose outer ring 64A is fixed to a frame body (unit frame body 53), and is rotatably held. The sliding nut 59 may be configured to be stopped from advancing by abutting against the end face of the inner ring 64B of the bearing 64 provided as a predetermined member at a predetermined position. In this way, by using the bearing that supports the sliding screw shaft, the linear motion of the sliding nut can be switched to a rotational motion.

[0057] Rotation of the sliding nut 59 about its axis is transmitted to the driving rotary blade 71A via a gear train (the gear 59A of the sliding nut 59, the idler gear 73, and the driving gear 77). The sliding nut 59 may be provided with an elastic member 69 that biases it in a direction opposite to one direction. The elastic member 69 may be a torsion spring wound around the outer peripheral surface (smooth surface 59B) of the sliding nut 59, with one end 69A fixed to the frame body (the housing portion 75A of the case 75).

[0058] It is possible that the gear train that transmits the rotation of the sliding nut to the driving rotary blade becomes strongly engaged and stuck. Therefore, by providing an elastic member (torsion spring) that applies torque for rotating in the opposite direction, even if sticking occurs, the sticking can be eliminated and the sliding nut can be moved in the retracting direction.

[0059] As described above, the embodiments of the present invention have been specifically described, but the present invention is not limited to these embodiments, and it goes without saying that changes can be made within the scope of the technical idea of the present invention.

[0060] For example, in the above embodiment, a torsion spring was wound around the sliding nut to bias it in the opposite direction, but of course, other means such as a one-way clutch may be used.

[0061] In the above-described embodiment, the linear motion of the slide nut is switched to rotational motion by the slide nut hitting against the inner ring of the bearing. However, of course, any means may be used as long as the linear motion of the slide nut can be stopped.

Explanation of Signs

[0062] 1 Printer 3 Main body 5 Dustbin 7 Exterior cover 9 Upper front case 11 Lower front case 13 Roll paper storage chamber 15 Sheet paper storage chamber 17 Ribbon storage chamber 19 Cutter unit 21 Slitter unit 23 Discharge port 25 Slitter part 31 Conveyor mechanism 33 Roll paper feed roller 35 Sheet paper feed roller 37 Sheet paper supply roller 39 Grip roller 41 Platen roller 43 Reverse roller 45 Cutter part roller 47 Slitter part roller 49 Thermal head 51 Guide part 53 Unit frame 55 Motor 57 Ball screw shaft 59 Slide nut 61 Pinion gear 63,64 Bearing 65 Driving gear 67 Idler gear 69 Torsion spring 71 Set of rotary blades 71A Driving rotary blade 71B Driven rotary blade 73 Idler gear 75 Case 77 Driving Gear CP Conveyor Path T Ink Ribbon IR Ink Ribbon Unit H Height Direction L Front - Rear Direction W Width Direction

Claims

1. A motor, A round bar member having a male thread formed on its outer peripheral surface, and a sliding screw shaft that rotates around an axis by the rotation of the motor, A female thread is formed on the inner peripheral surface, and it is screwed onto the sliding screw shaft in a posture where the rotation around the axis is restricted. By the rotation of the sliding screw shaft in one direction, it moves in the advancing direction along the sliding screw shaft and advances to a predetermined position. After the advancement is stopped by hitting a predetermined member at the predetermined position, a sliding nut that rotates around the axis integrally with the rotation of the sliding screw shaft, A slitter unit having a set of rotary blades including a driving rotary blade and a driven rotary blade that move along the sliding screw shaft integrally with the sliding nut, are rotationally driven by the rotation of the sliding nut around the axis, and cut a sheet passing in the conveyance direction orthogonal to the axial direction along the conveyance direction, A printer characterized by comprising the above.

2. The rotation of the sliding nut around the axis is restricted by the load due to the friction of the contact between the driving rotary blade and the driven rotary blade, When the advancement of the sliding nut is stopped by hitting the predetermined member at the predetermined position, a torque exceeding the load is applied to the sliding nut from the sliding screw shaft, causing the sliding nut to rotate around the axis The printer according to claim 1, characterized by the above.

3. The sliding screw shaft is supported by the inner ring of a bearing whose outer ring is fixed to a frame body and is rotatably held, The sliding nut is stopped from advancing by hitting the end face of the inner ring of the bearing provided as the predetermined member at the predetermined position The printer according to claim 1 or 2, characterized by the above.

4. The rotation of the sliding nut around the axis is transmitted to the driving rotary blade via a gear train, The sliding nut is provided with an elastic member that biases in the direction opposite to the one direction The printer according to claim 3, characterized by the above.

5. The elastic member is a torsion spring wound around the outer peripheral surface of the sliding nut and having one end fixed to a frame body The printer according to claim 4, characterized by the above.

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