JP2013215984A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer which can cause rolled paper to approach a central portion so as to fix the rolled paper to a support shaft.SOLUTION: A printer is provided with a bearing type rolled paper holder which rotatably supports both ends of a support shaft 31 inserted into rolled paper 4. The rolled paper holder has a pair of lock members 10A, 10B which are slidably attached to the support shaft 31, and the lock members 10A, 10B are moved in the opposite directions along the support shaft 31 by a lock member guide mechanism. When the lock members 10A, 10B are attached to both sides of the rolled paper 4 and are allowed to approach the rolled paper 4 from the both sides, tip portions of rolled paper fixing sections 11A, 11B are inserted into a shaft hole 42 of the rolled paper 4, and outer peripheral faces of the rolled paper fixing sections 11A, 11B are diagonally pressed against opening edges of the shaft hole 42. In the condition, the lock members 10A, 10B are positioned in a direction of a shaft line L by a lock member positioning mechanism 50 so that the rolled paper 4 is fixed to the support shaft 31.

Description

  The present invention relates to a printer that loads roll paper and performs printing on a recording paper drawn from the roll paper.

  2. Description of the Related Art Conventionally, printers are used in which roll paper obtained by winding a long recording paper in a roll shape is loaded into a roll paper holder, and the recording paper is pulled out from the roll paper for printing. Some roll paper holders have a bearing system that rotatably supports the roll paper by pivotally supporting both ends of a support shaft inserted into the roll paper core. This type of roll paper holder is configured so that the roll paper can be positioned by shifting it to one end of the support shaft, or the roll paper can be positioned by being centered by the center of the support shaft. By positioning the roll paper, it is possible to suppress the shift of the recording paper conveyance position. Thereby, printing accuracy can be raised and the trouble at the time of conveyance can be suppressed.

  In Patent Document 1, a pair of guide plates are arranged on both sides in the width direction of the roll paper, and the guide paper is moved in a reverse direction along the support shaft by a rack and pinion mechanism to move the roll paper. A printer having a paper holder (roll paper holder) that can be positioned in the center is disclosed.

JP 2007-45127 A

  Here, in the printer that pulls out the recording paper from the roll paper and performs printing, there is a case where the operation of winding the drawn recording paper back on the roll paper is necessary. For example, it is desirable that the recording paper can be wound on a roll paper when the recording paper is greatly bent due to reverse feeding or the like. However, since the roll paper is rotatable with respect to the support shaft in the printer of Patent Document 1, the roll paper cannot be forcibly rotated via the support shaft, and the recording paper is wound around the roll paper. I can't.

  In addition, when a wide recording paper is used, the weight of the roll paper may increase. When printing with such a roll paper loaded, in order to feed the recording paper in a balanced manner, the center of the roll paper is required. It is desirable to position the roll paper with a reference. Further, in order to wind the recording paper around the heavy roll paper, it is necessary to ensure that the roll paper can be fixed to the support shaft.

  In view of the above, an object of the present invention is to provide a printer in which roll paper can be positioned on a support shaft while being center-aligned, and the roll paper can be securely fixed to the support shaft.

In order to solve the above problems, the present invention is a printer that transports a recording paper drawn from a roll paper loaded in a roll paper holder along a transport path via a print head and prints on the recording paper. And
The roll paper holder is
A support shaft inserted through a shaft hole formed in the roll paper;
Support means for rotatably supporting the support shaft;
A pair of locking members attached to both sides of the support shaft in the width direction of the roll paper;
Lock member guide means for moving the pair of lock members in the opposite direction along the support shaft;
Lock member positioning means for positioning the pair of lock members in the axial direction of the support shaft;
Each lock member includes a roll paper fixing portion that protrudes toward the roll paper side and is arranged coaxially with respect to the support shaft.
The roll paper fixing portion is characterized in that the front end portion is thinner than the opening diameter of the shaft hole and the rear end portion is thicker than the opening diameter of the shaft hole.

  In the present invention, since the roll paper can be guided from both sides by the pair of lock members that move in the opposite directions along the support shaft, the roll paper can be positioned with reference to the center. At this time, the roll paper fixing portions of both lock members are inserted from both ends of the shaft hole of the roll paper, and both lock members are brought close to each other until the outer peripheral surface of the roll paper fixing portion is strongly pressed against the opening edge of the shaft hole. be able to. Accordingly, each lock member can be pressed strongly against the roll paper from both sides to form a state in which they are integrally rotated. In this state, the lock member is positioned in the axial direction of the support shaft so that the roll paper can be moved from both sides by the lock member. It can be pressed and fixed to the support shaft. Therefore, the recording paper can be taken up by rotating the support shaft. Further, the recording paper can be fed out from the center of the support shaft, and the recording paper can be taken up near the center of the support shaft.

  In the present invention, the outer peripheral surface of the roll paper fixing portion is preferably a conical surface. If it does in this way, since the outer peripheral surface of a roll paper fixing | fixed part will contact | abut diagonally with respect to the opening edge of the shaft hole of roll paper, pressing force can be concentrated and roll paper can be pinched with strong force. Therefore, the roll paper can be strongly fixed to the support shaft.

  In this case, it is desirable that grooves or protrusions extending radially in the radial direction of the support shaft are formed on the outer peripheral surface of the roll paper fixing portion. In this way, irregularities are formed in the portion of the roll paper fixing portion that contacts the opening edge of the shaft hole of the roll paper, and the pressing force is concentrated on the convex portion (the portion between the grooves or the ridge). Join in. Accordingly, the pressing force can be further concentrated, and the fixing force of the roll paper to the support shaft can be further increased.

  Further, in the present invention, the lock member positioning means is mounted on the outer periphery of the support shaft and divided into a plurality of parts in the circumferential direction, and the outer cylinder mounted on the outer periphery of the inner divided cylinder. Each of the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the inner divided cylindrical body is provided with a tapered thread surface whose diameter decreases toward one end side in the axial direction of both cylindrical bodies. The outer cylinder is attached so as not to be relatively movable in the axial direction relative to one of the pair of locking members, and the inclination of the thread surface of the outer cylinder and the inner divided cylinder is determined by the inner division. It is desirable that the outer cylinder and the one lock member are set so as to move in a direction approaching the other lock member when the outer cylinder is rotated to tighten the cylinder. Thus, if a taper screw mechanism is constituted between the inner divided cylinder and the outer cylinder, the outer cylinder can be moved in the axial direction when the inner divided cylinder is tightened. Therefore, when both lock members are fixed to the support shaft, both lock members can be brought closer together, and the roll paper can be sandwiched more strongly.

  According to the present invention, since the roll paper can be guided from both sides by the pair of lock members that move in the opposite directions along the support shaft, the roll paper can be positioned with reference to the center. At this time, the roll paper fixing portions of both lock members are inserted from both ends of the shaft hole of the roll paper, and both lock members are brought close to each other until the outer peripheral surface of the roll paper fixing portion is strongly pressed against the opening edge of the shaft hole. be able to. Accordingly, each lock member can be pressed strongly against the roll paper from both sides to form a state in which they are integrally rotated. In this state, the lock member is positioned in the axial direction of the support shaft so that the roll paper can be moved from both sides by the lock member. It can be pressed and fixed to the support shaft. Therefore, the recording paper can be taken up by rotating the support shaft. Further, the recording paper can be fed out from the center of the support shaft, and the recording paper can be taken up near the center of the support shaft.

1 is a schematic longitudinal sectional view showing a main part of a printer to which the present invention is applied. It is a side view which shows the structure of the principal part of a roll paper holder. It is a longitudinal cross-sectional view of a support shaft and a lock member. It is the longitudinal cross-sectional view and front view of a lock member and a lock member positioning mechanism. It is a side view of the roll paper fixing | fixed part and roll paper of a modification.

  Hereinafter, an embodiment of a printer to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a schematic longitudinal sectional view showing a main part of a printer to which the present invention is applied. The printer 1 is an ink jet printer, and includes a main body frame 2 that supports each mechanism portion of the printer 1 and a roll paper holder 3 disposed on the rear end side of the main body frame 2. The roll paper holder 3 is loaded with a roll paper 4 obtained by winding a long recording paper P in a roll shape. In the printer 1, a transport path 5 for transporting the recording paper P fed from the roll paper 4 in the roll paper holder toward the front of the printer is configured. The printer 1 includes a recording paper transport mechanism 6 for transporting the recording paper P along the transport path 5 and a printing mechanism 7 for printing on the recording paper P transported along the transport path 5. . The printed recording paper P is discharged from a recording paper discharge port 8 provided on the front end side of the main body frame 2. The printing mechanism 7 includes an inkjet head 7a (printing head) and a platen 7b, and a printing position A on the conveyance path 5 is defined by these.

(Roll paper holder)
FIG. 2 is a side view showing the configuration of the main part of the roll paper holder. 3 is a longitudinal sectional view of the support shaft and the locking member, and FIG. 4 is a longitudinal sectional view and a front view of the locking member and the locking member positioning mechanism. The roll paper 4 of this example includes a cylindrical winding core 41, and the recording paper P is wound around the outer periphery of the winding core 41. A shaft hole 42 is formed in the winding core 41. The roll paper holder 3 includes a support shaft 31 inserted through the shaft hole 42 of the roll paper 4 and a support frame 32 (support means) that rotatably supports both ends of the support shaft 31. The support frame 32 is fixed to the main body frame 2 of the printer 1. The support shaft 31 can be attached to and detached from the support frame 32. When the support shaft 31 is set on the support frame 32, a support shaft drive mechanism 33 for rotating the support shaft 31 in the forward and reverse directions is configured at the end of the support shaft 31. The support shaft drive mechanism 33 is, for example, connected to a drive motor 33a, a drive force transmission mechanism 33b for transmitting the rotation of the drive motor 33a to the support shaft 31, and a drive force transmission path by the drive force transmission mechanism 33b. A clutch mechanism 33c for switching to the disconnected state is provided.

  As shown in FIG. 2, the roll paper holder 3 includes a pair of lock members 10 </ b> A and 10 </ b> B that are slidably attached to the support shaft 31 in the direction of the axis L, and the lock members 10 </ b> A and 10 </ b> B along the support shaft 31. The lock member guide mechanism 20 (lock member guide means: see FIG. 3) for moving in the opposite direction and the lock member positioning mechanism 50 for positioning the lock members 10A and 10B on the support shaft 31 in the direction of the axis L thereof. (Lock member positioning means).

  As shown in FIG. 3, the lock members 10 </ b> A and 10 </ b> B are provided with roll paper fixing portions 11 </ b> A and 11 </ b> B projecting conically on one end side and shaft holes 12 </ b> A and 12 </ b> B passing through the centers thereof. Two guide grooves 31 a and 31 b extending in the direction of the axis L are formed on the outer peripheral surface of the support shaft 31. On the other hand, two guide protrusions 13A and 14A are formed inside the shaft hole 12A, and two guide protrusions 13B and 14B are formed inside the shaft hole 12B. When the support shaft 31 is inserted through the shaft hole 12A of the lock member 10A, the guide projection 13A is fitted into the guide groove 31a, and the guide projection 14A is fitted into the guide groove 31b. When the support shaft 31 is inserted into the shaft hole 12B of the lock member 10B, the guide protrusion 13B is fitted into the guide groove 31a, and the guide protrusion 14B is fitted into the guide groove 31b. Thus, the lock members 10A and 10B are slidable in the direction of the axis L with respect to the support shaft 31, and are attached so as not to be rotatable relative to the axis L.

  The lock members 10 </ b> A and 10 </ b> B are attached to positions on both sides of the support shaft 31 in the width direction of the roll paper 4. The lock member 10 </ b> A can be attached to and detached from the support shaft 31. When the roll paper 4 is mounted on the support shaft 31, the lock member 10A is removed from the support shaft 31, the support shaft 31 is inserted into the shaft hole 42 of the roll paper 4, and then the lock member 10A is opposite to the lock member 10B. The support shaft 31 is inserted from the side. Thereby, the lock members 10 </ b> A and 10 </ b> B are attached to both sides in the width direction of the roll paper 4. The lock member 10B can be attached to and detached from the support shaft 31, and the lock member 10B can be detached and the roll paper 4 can be attached.

  As shown in FIG. 2, the leading end of the roll paper fixing portion 11 </ b> A protrudes toward one end face of the roll paper 4, and the leading end of the roll paper fixing portion 11 </ b> B protrudes toward the other end face of the roll paper 4. . The roll paper fixing portions 11A and 11B are mounted coaxially on the support shaft 31, the outer diameter (dimension D1 shown in FIG. 2) of the front end portion is smaller than the inner diameter D of the shaft hole 42, and the rear end portion. Is larger than the inner diameter D of the shaft hole 42. When the lock members 10A and 10B are slid in the opposite direction along the support shaft 31 and approach the roll paper 4 from both sides, the leading end of the roll paper fixing portion 11A is inserted from the opening on one end side of the shaft hole 42 of the roll paper 4 Is done. Further, the leading end of the roll paper fixing portion 11B is inserted from the opening on the other end side of the shaft hole 42. When the lock members 10A and 10B are further brought closer, the outer peripheral surface (conical surface) of the roll paper fixing portion 11A hits the edge of the opening on one end side of the shaft hole 42, and the outer peripheral surface (conical surface) of the roll paper fixing portion 11B. Surface) abuts against the edge of the opening on the other end side of the shaft hole 42. When the lock members 10A and 10B are pressed against the roll paper 4 from both sides, the outer peripheral surfaces of the roll paper fixing portions 11A and 11B are strongly pressed by the corners of the opening edges on one end side and the other end side of the shaft hole 42. . Thereby, the roll paper 4 cannot be rotated with respect to the lock members 10A and 10B.

  The support shaft 31 incorporates the lock member guide mechanism 20 therein. As shown in FIG. 3, the lock member guide mechanism 20 includes a pair of rack gears 21A and 21B arranged in parallel with their tooth surfaces facing each other, and a pinion gear 22 arranged between the rack gears 21A and 21B. The rack gears 21A and 21B extend in the direction of the axis L of the support shaft 31 and mesh with the pinion gear 22 from both sides. Inside the support shaft 31, guide grooves (not shown) for holding the rack gears 21A, 21B so as to be movable in the direction of the axis L are formed. When the pinion gear 22 is rotated, the rack gears 21A and 21B are translated in the reverse direction along the guide grooves.

  The rack gear 21A is formed with a guide protrusion 23A that protrudes into the guide groove 31a. The rack gear 21B is formed with a guide protrusion 23B that protrudes into the guide groove 31b. In this example, when the lock members 10A and 10B are attached to the support shaft 31, the guide protrusion 23A engages with the guide protrusion 13A of the lock member 10A, and the guide protrusion 23B engages with the guide protrusion 14B of the lock member 10B. Accordingly, when any of the lock members 10A and 10B is moved in the direction of the axis L, the rack gear 21A or 21B engaged therewith moves and the pinion gear 22 rotates. Accordingly, the other rack gear and the lock member engaged therewith move in the opposite direction by the same dimension. In this example, the pinion gear 22 is arranged at the center position of the support shaft 31 in the axis L direction. Therefore, the roll paper 4 sandwiched between the lock members 10 </ b> A and 10 </ b> B is positioned so that the center in the width direction coincides with the center in the axis L direction of the support shaft 31.

  As described above, since the lock members 10A and 10B move in conjunction with the lock member guide mechanism 20, the other of the lock members 10A and 10B is also positioned by positioning one of the lock members 10A and 10B with respect to the support shaft 31 in the axis L direction. The The lock member positioning mechanism 50 is a mechanism for positioning the lock member 10 </ b> B in the direction of the axis L with respect to the support shaft 31. The lock member positioning mechanism 50 includes an inner divided cylinder 51 attached to the outer periphery of the support shaft 31 and an outer cylinder 52 attached to the outer periphery of the inner divided cylinder 51. The outer cylinder 52 is attached to the end surface 15 facing the opposite side of the tip of the roll paper fixing portion 11B in the lock member 10B. An engagement groove 16 extending in the circumferential direction is formed on the end surface 15 of the lock member 10B. On the other hand, an engagement protrusion 53 is formed on the end surface 52a of the outer cylindrical body 52 facing the end surface 15 of the lock member 10B in the axis L direction. When the engagement groove 16 and the engagement protrusion 53 are engaged, the outer cylindrical body 52 is coaxially attached to the lock member 10B. Since the engagement groove 16 and the engagement protrusion 53 have an L-shaped cross section, the outer cylindrical body 52 and the lock member 10 </ b> B move integrally along the support shaft 31 in the axis L direction. Further, since the engagement protrusion 53 can slide in the engagement groove 16 in the circumferential direction, the outer cylindrical body 52 and the lock member 10B are relatively rotatable.

  As shown in FIG. 4, the inner divided cylinder 51 is constituted by two divided cylinders 51 </ b> A and 51 </ b> B that are mounted with a gap in the circumferential direction along the outer peripheral surface of the support shaft 31. In addition, you may comprise the inner side division | segmentation cylinder 51 by three or more division | segmentation cylinders. The lock member positioning mechanism 50 includes a taper screw mechanism configured between the inner divided cylinder 51 and the outer cylinder 52. That is, the outer peripheral surface of the inner divided cylindrical body 51 is a screw surface 54 on which a helical thread is formed. The thread surface 54 is a tapered thread surface whose diameter increases toward one end side in the axis L direction. On the other hand, the inner peripheral surface of the outer cylindrical body 52 is a tapered thread surface 55 having the same inclination as the thread surface 54. The screw surface 55 is formed with a spiral thread groove that is screwed into the thread of the screw surface 54.

  The inclination of the threaded surface 54 of the inner divided cylindrical body 51 and the threaded surface 55 of the outer cylindrical body 52 is increased toward the end surface 52a side of the outer cylindrical body 52 (that is, the end side connected to the lock member 10B). The diameters of the surfaces 54 and 55 are set to increase. In this way, when the outer cylinder 52 is turned in the circumferential direction and the inner divided cylinder 51 is tightened, the outer cylinder 52 moves toward the other lock member 10A together with the lock member 10B. That is, the lock member positioning mechanism 50 can position the lock members 10A and 10B in the direction of the axis L with respect to the support shaft 31 via the outer cylindrical body 52 and the inner divided cylindrical body 51, and at the start of fixing (at the start of tightening). Both lock members can be brought closer to each other.

  As described above, the printer 1 of this example supports the roll paper 4 by disposing the roll paper 4 between the pair of lock members 10 </ b> A and 10 </ b> B that move in the reverse direction in conjunction with the support shaft 31. It can be positioned on the axis 31 with a central reference. At this time, the roll paper fixing portions 11A and 11B of both lock members are inserted from both ends of the shaft hole 42 of the roll paper 4 so that the outer peripheral surfaces of the roll paper fixing portions 11A and 11B are strong at the opening edge of the shaft hole 42. Both locking members can be brought close to each other until they are pressed against each other. Therefore, the lock members 10A and 10B can be pressed strongly against the roll paper 4 from both sides to form a state in which they are integrally rotated. In this state, the roll paper 4 can be fixed to the support shaft 31 via the lock members 10A and 10B by positioning the lock members 10A and 10B in the direction of the axis L with respect to the support shaft 31. Therefore, the recording paper P can be taken up by rotating the support shaft 31. Further, the recording paper P can be fed out from the center of the support shaft 31, and the recording paper P can be taken up near the center of the support shaft 31.

  In this example, the outer peripheral surfaces of the roll paper fixing portions 11 </ b> A and 11 </ b> B are conical surfaces and abut against the opening edge of the shaft hole 42 of the roll paper 4 obliquely. In this way, by pressing the corners of the winding core 41 obliquely with respect to the conical surface, the pressing force can be concentrated and the roll paper 4 can be sandwiched with a strong force. Therefore, the roll paper 4 can be strongly fixed to the support shaft 31.

  Furthermore, in this example, since the taper screw mechanism is formed between the inner divided cylinder 51 and the outer cylinder 52 constituting the lock member positioning mechanism 50, the outer cylinder is tightened when the inner divided cylinder 51 is tightened. The body 52 can be moved in the direction of the axis L. Therefore, when both lock members are fixed to the support shaft 31, both lock members can be brought closer to each other, and the fixing force can be increased by sandwiching the roll paper 4 more strongly.

  The lock member guide mechanism 20 includes a pair of rack gears 21A and 21B arranged in parallel along the axis L direction of the support shaft 31 and a pinion gear arranged so that the pair of rack gears 21A and 21B mesh from both sides. The lock and pinion mechanism includes a lock member 10A that moves in conjunction with the rack gear 21A, and a lock member 10B that moves in conjunction with the rack gear 21B. Thereby, both lock members can be moved in the reverse direction around the pinion gear 22, and the roll paper 4 can be centered.

(Modification example)
(1) FIG. 5 is a side view of a modified roll paper fixing unit and roll paper. In the above embodiment, the outer peripheral surfaces of the roll paper fixing portions 11A and 11B that press the roll paper 4 from both sides are flat conical surfaces, but the protrusions extending radially in the radial direction as shown in FIG. The strip 17 may be formed. In this case, since the irregularities are formed on the outer peripheral surfaces of the roll paper fixing portions 11A and 11B that are in contact with the opening edge of the shaft hole 42 of the roll paper 4, the pressing force is concentrated on the convex portions (ridge portions 17). Join in. Accordingly, the pressing force can be further concentrated, and the fixing force of the roll paper 4 to the support shaft 31 can be further increased. In addition, the same effect is acquired even if it forms a groove | channel instead of forming the protrusion 17 in the outer peripheral surface of roll paper fixing | fixed part 11A, 11B. Alternatively, the fixing force of the roll paper 4 can be increased by forming the outer peripheral surfaces of the roll paper fixing portions 11A and 11B with a material having a high friction coefficient such as rubber.

(2) In the above embodiment, the roll paper fixing portions 11A and 11B are conical, but other tapered shapes may also be used. For example, a shape in which the inclination changes from the front end side toward the rear end side, or a step shape in which the inclination changes stepwise may be provided on the outer peripheral surface.

DESCRIPTION OF SYMBOLS 1 ... Printer, 2 ... Main body frame, 3 ... Roll paper holder, 4 ... Roll paper, 5 ... Conveyance path, 6 ... Recording paper conveyance mechanism, 7 ... Printing mechanism, 7a ... Inkjet head (printing head), 7b ... Platen, 8 ... Recording paper discharge port, 10A ... Lock member, 10B ... Lock member, 11A ... Roll paper fixing part, 11B ... Roll paper fixing part, 12A ... Shaft hole, 12B ... Shaft hole, 13A ... Guide protrusion, 13B ... Guide protrusion , 14A ... guide projection, 14B ... guide projection, 15 ... end face, 16 ... engagement groove, 17 ... ridge, 20 ... lock member guide mechanism (lock member guide means), 21A ... rack gear, 21B ... rack gear, 22 ... Pinion gear, 23A ... guide protrusion, 23B ... guide protrusion, 31 ... support shaft, 31a ... guide groove, 31b ... guide groove, 32 ... support frame (support means), 33 Support shaft drive mechanism, 33a ... drive motor, 33b ... drive force transmission mechanism, 33c ... clutch mechanism, 41 ... winding core, 42 ... shaft hole, 50 ... lock member positioning mechanism (lock member positioning means), 51 ... inner divided cylinder 51A ... split cylinder, 51B ... split cylinder, 52 ... outer cylinder, 52a ... end face, 53 ... engagement projection, 54 ... thread face, 55 ... thread face, A ... printing position, D ... inside diameter, D1 ... outer diameter, D2 ... outer diameter, L ... axis, P ... recording paper

Claims (4)

A printer that prints on the recording paper by transporting the recording paper drawn from the roll paper loaded in the roll paper holder along a transport path via the print head,
The roll paper holder is
A support shaft inserted through a shaft hole formed in the roll paper;
Support means for rotatably supporting the support shaft;
A pair of locking members attached to both sides of the support shaft in the width direction of the roll paper;
Lock member guide means for moving the pair of lock members in the opposite direction along the support shaft;
Lock member positioning means for positioning the pair of lock members in the axial direction of the support shaft;
Each lock member includes a roll paper fixing portion that protrudes toward the roll paper side and is arranged coaxially with respect to the support shaft.
The roll paper fixing portion has a front end portion thinner than the opening diameter of the shaft hole and a rear end portion thicker than the opening diameter of the shaft hole. In claim 1,
The printer according to claim 1, wherein an outer peripheral surface of the roll paper fixing portion is a conical surface. In claim 1 or 2,
A printer characterized in that grooves or protrusions extending radially in the radial direction of the support shaft are formed on the outer peripheral surface of the roll paper fixing portion. In any one of claims 1 to 3,
The lock member positioning means includes
An inner divided cylinder mounted on the outer periphery of the support shaft and divided into a plurality of parts in the circumferential direction;
An outer cylinder mounted on the outer periphery of the inner divided cylinder,
Each of the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the inner divided cylindrical body is provided with a tapered thread surface whose diameter decreases toward one end side in the axial direction of both cylindrical bodies,
The outer cylinder is
It is attached to one of the pair of lock members so as not to move relative to the axial direction,
The inclination of the threaded surface of the outer cylinder and the inner divided cylinder is such that when the outer cylinder is turned to tighten the inner divided cylinder, the outer cylinder and the one locking member are locked to the other. A printer configured to move in a direction approaching a member.

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