JP2007313673A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer having good operability capable of obviating the need of an operation for centering of a print roll. <P>SOLUTION: This printer comprises a first guide 11 to be in contact with a first end face of a print roll, a second guide 12 provided at the side of a tip portion 10F of an unwinding shaft 10 to be in contact with a second end face of the print roll, a first engagement member 16 attached to the unwinding shaft 10 movably in the axial direction Y to be engaged with the first guide 11, a second engagement member 17 attached to the unwinding shaft 10 movably in the axial direction Y to be engaged with the second guide 12, and a transmission means 14 for synchronously moving both of the engagement members 16, 17 in the opposing directions, respectively. The unwinding shaft 10 can be inserted to the print roll until the first end face of the print roll is brought into contact with the first guide 11 while the print roll is not engaged with the second engagement member 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printer for loading a printing roll, and more particularly to a holder for the printing roll.

  In recent years, labels attached to products and the like have become various and diverse, and the widths of labels have also increased. For this reason, a plurality of types of labels can be loaded into one label printer, and the label roll is centered by adjusting the guide according to the change in the label width every time the label width changes. By performing centering, high-speed and high-precision printing becomes possible.

The following Patent Document 1 is known as an apparatus that enables such adjustment.
JP 11-139638 (Abstract, 0028)

  In the apparatus of Patent Document 1, it is necessary to perform centering by rotating the operation knob after loading the label roll, and the operation for centering is troublesome.

  Accordingly, an object of the present invention is to provide a printer with good operability that does not particularly require an operation for centering a printing roll.

  In order to achieve the above-mentioned object, the present invention provides an unwinding shaft for detachably holding printing paper from a printing roll wound in a hollow cylindrical shape at the center, and a printing unwound from the unwinding shaft. A printer having a printing unit for printing on a sheet, the printer being provided movably in the axial direction of the unwinding shaft on the proximal end side of the unwinding shaft, and contacting a first end surface of the printing roll A first guide, a second guide that is detachably provided on a distal end side of the unwinding shaft, and is attached to be movable in the axial direction of the unwinding shaft; A first engagement member that engages with the first guide; a second engagement member that is attached to be movable in the axial direction of the unwinding shaft and that engages with the second guide; and the first and second members. Transmission means for moving the combined member in synchronization with each other in opposite directions, and the printing Wherein the Lumpur is possible inserting the printing roll to the first end surface of the printing roll without engaging the second engagement member is in contact with the first guide to the unwinding shaft.

  When loading a wide print roll, the print roll is pushed inward toward the base end while inserting the print roll through the unwinding shaft and bringing the print roll into contact with the first guide. At the time of the insertion, the printing roll does not engage with the second engagement member, and moves the first engagement member toward the base end side via the first guide. At the same time, the second engagement member moves toward the distal end side in synchronization with the movement of the first engagement member toward the proximal end side. After the printing roll is inserted, when the second guide is inserted through the unwinding shaft, the second guide is engaged with the second engaging member that has moved to the tip end side, and the second engaging member together with the second guide is based on the second guide. Move toward the end. At the same time, in synchronization with the movement of the second engagement member, the first engagement member moves to the distal end side.

  On the other hand, when loading a narrow print roll, the print roll is inserted into the unwinding shaft and brought into contact with the first guide. During the insertion, the print roll does not engage with the second engagement member. After the printing roll is inserted, when the second guide is inserted through the unwinding shaft, the second guide engages with the second engaging member, and the second engaging member moves toward the base end side together with the second guide. To do. At the same time, in synchronization with the movement of the second engagement member, the first engagement member moves to the distal end side.

In this manner, the two engaging members move in opposite directions in synchronization with each other, and the guides are engaged with the engaging members, so that the print roll is centered, and high speed and high accuracy are achieved. Printing is possible.
In addition, since the second engagement member engages with the second guide without engaging with the print roll, centering is performed only by pushing the print roll together with the second guide. Accordingly, there is no need to perform any centering operation during the printing roll loading operation.

  The transmission means in the present invention moves both the engaging members in a direction away from each other when the first guide is pushed toward the base end side, and the second engaging member is moved to the base end portion via the second guide. When pushed in, the engagement members are moved in directions approaching each other.

In the present invention, the transmission means is accommodated in the unwinding shaft, and the second engaging member is placed in the notch portion of the unwinding shaft formed by notching a part of a cylindrical shape. It is preferable to project so as not to engage with the circumference and to engage with the second guide.
According to this aspect, the second engaging member is not engaged with the normal cylindrical paper tube by projecting the second engaging member by cutting out a part of the unwinding shaft, and the second Engage with the guide.

In the present invention, in the vicinity of the second engagement member, it protrudes in the radial direction from the second engagement member, and comes into contact with the inner periphery of the print roll so that the print roll engages with the second engagement member. It is preferable to further include an engagement preventing part for preventing the above.
According to this aspect, even a printing roll having an inner diameter larger than the outer diameter of the unwinding shaft can be inserted without being engaged with the second engagement member. Therefore, it is easy to load a printing roll having a large inner diameter.

In the present invention, first and second attachments that are larger than the outer diameter of the unwinding shaft and invade and contact the hollow portion of the printing roll are provided on the first and second guides, respectively. It is preferable that the attachment can be retracted outward from the contact end face of each guide and can be fixed in a state of projecting from each guide toward the print roll.
According to this aspect, it is possible to hold the print rolls having different inner diameters using the attachment.

In the present invention, the first and second attachments, each of which includes a plurality of radially provided claws, enters and contacts the hollow portion of the printing roll and decreases in diameter in the direction of entry, are the first and second attachments, respectively. It is preferable that the first attachment and the second attachment are provided in a second guide and can be arranged so as to wrap in the axial direction.
According to this aspect, it is possible to hold printing rolls having different inner diameters, and it is possible to hold even a printing roll having a very narrow width.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 7 show a first embodiment.

Schematic configuration:
As shown in FIG. 1A, the label printer 1 includes a printing roll Lr, a damper 20, a transport unit 30, a label sensor 40, a printing unit 50, and a ribbon supply unit 60.

  The printing roll Lr is formed by, for example, winding a strip-shaped printing paper L around a paper tube Lc. As shown in FIG. 1 (b), the printing paper L is composed of a number of labels L1 coated with an adhesive on the back surface and a strip-shaped mount L2 on which the labels L1 are temporarily attached. Adjacent labels L1 are temporarily attached to the mount L2 with a slight interval Δ therebetween.

  As shown in FIG. 1A, the printing roll Lr is configured such that the paper tube Lc is fitted on the outer periphery of a bobbin (unwinding shaft) 10 that is rotatably provided with respect to the plate frame 70 of the label printer 1. The label printer 1 is loaded.

  The printing paper L unwound from the printing roll Lr is guided to the transport unit 30 via the damper 20. The conveyance unit 30 sends the printing paper L to the printing unit 50.

  A label sensor 40 is provided between the conveyance unit 30 and the printing unit 50. The label sensor 40 is composed of, for example, an optical sensor, and detects the front end Lf and the rear end Lb of the label L1 shown in FIG.

  In FIG. 2, the label sensor 40 includes a light projecting unit 41 and a light receiving unit 42. The light emitted from the light projecting unit 41 passes through the printing paper L and is detected by the light receiving unit 42. The label sensor 40 detects the end portions Lf and Lb of the label L1 shown in FIG. 1B based on the change in the amount of transmitted light detected by the light receiving unit.

  The printing unit 50 shown in FIG. 1A includes a print head 51 and a platen roller 52, and the print paper L is supplied between the print head 51 and the platen roller 52. The printing paper L is conveyed at a predetermined speed in the printing unit 50 by a platen roller 52 that is rotationally driven by a motor (not shown).

  On the other hand, a ribbon supply unit 60 for supplying the ink ribbon 62 is provided above the print head 51 shown in FIG. The ribbon supply unit 60 includes an unwinding roller 63 on which a ribbon roll 61 is loaded and a winding roller 64. The ink ribbon 62 is unwound from the ribbon roll 61 loaded on the unwinding roller 63 and supplied to the printing unit 50. The ink ribbon 62 is supplied in the printing unit 50 so as to be in close contact with the upper surface of the label L1.

  Due to the heat generated by the print head 51, a predetermined portion of the ink ribbon 62 is thermally transferred to the print surface Ls of the label L1, whereby printing is performed on the print surface Ls of the label L1. The printing position on the printing surface Ls is determined based on the front end Lf of the label L1 detected by the label sensor 40.

  The printed printing paper L is discharged from the label printer 1 to the outside of the label printer 1. On the other hand, the printed ink ribbon 62 is taken up by the take-up roller 64.

Transport unit 30:
As shown in FIG. 2, the transport unit 30 includes a transport belt 31 that is in close contact with the lower surface of the print paper L, and a pressing belt 32 that is in close contact with the upper surface of the print paper L. Both belts 31 and 32 are endless flat belts, respectively, and the printing paper L is sandwiched between the belts 31 and 32 and conveyed in the conveyance direction X.

  The conveyance belt 31 is disposed between a drive pulley (drive belt wheel) 33 provided on the downstream side in the conveyance direction X of the printing paper L and a driven pulley (driven belt wheel) 34 provided on the upstream side. It is wound. The drive pulley 33 is rotated by the motor (not shown). The driven pulley 34 is provided so as to be rotatable with respect to the plate-like frame 70 of FIG.

  On the other hand, the pressing belt 32 in FIG. 2 is wound between a pressing roller 35 provided on the upstream side along the conveyance direction X of the printing paper L and an auxiliary roller 36 provided on the downstream side. The pressing roller 35 and the auxiliary roller 36 are provided so as to be rotatable with respect to the plate-like frame 70 (FIG. 1A). As shown in FIG. 2, the pressing roller 35 is provided between the drive pulley 33 and the driven pulley 34, and circumscribes the driven pulley 34 via a pair of belts 31 and 32 and the printing paper L. ing.

  When the drive pulley 33 is driven to rotate in the forward direction indicated by the arrow in FIG. 2 by the motor, the contact surface of the transport belt 31 with the print paper L moves in the transport direction X, and the label of the pressing belt 32 The contact surface on the L1 side moves in the transport direction X, and the printing paper L is sent out toward the printing unit 50.

Next, the main part of the present invention will be described.
As shown in FIG. 3, the bobbin 10 is formed in a substantially cylindrical shape, and is provided so as to be rotatable about a rotation shaft 18 protruding from the fixing member 19. The fixing member 19 is fixed to the back side of the plate-like frame 70 in FIG.

First and second guides 11 and 12:
As shown in FIG. 3, a first guide 11 is slidably attached to the bobbin 10, while a second guide 12 is detachably provided. The first and second guides 11 and 12 are formed in a substantially disc shape, and first and second sliding holes 11h and 12h that slide and fit into the outer periphery of the bobbin 10 at the center of the disc. Is provided.

The first guide 11 has the first sliding hole 11h fitted in the bobbin 10, and is attached to the base end 10D side of the bobbin 10 so as to be movable in the axial direction Y of the bobbin 10. On the other hand, as shown in FIG. 5, the second guide 12 is movable in the axial direction Y of the bobbin 10 on the tip portion 10 </ b> F side of the bobbin 10, with the second sliding hole 12 h fitted in the bobbin 10. In addition, the bobbin 10 can be extracted from the tip.
Although not shown in the figure, the second guide 12 is provided with a fastening means for fixing the second guide 12 to the bobbin 10.

  As shown in FIGS. 6C and 7C, when the printing roll Lr is set, the contact end surface 11G (FIG. 3) of the first guide 11 is placed on the first end surface LA which is one end surface of the printing roll Lr. At the same time, the contact end surface 12G (FIG. 5) of the second guide 12 contacts the second end surface LB, which is the other end surface of the print roll Lr, and the print roll Lr is held.

Bobbin 10:
As shown in FIG. 3, the bobbin 10 is provided with a cutout portion 10 c formed by cutting out a part of a cylindrical shape.

Transmission means 14;
As shown in FIG. 4A, the bobbin 10 accommodates a transmission means 14 for centering. The transmission means 14 includes a pinion 10P and a pair of racks 10A and 10B. The pinion 10 </ b> P is provided to be rotatable about the center in the axial direction Y of the bobbin 10. The racks 10A and 10B are slidably provided in the bobbin 10 along the axial direction Y. The first and second racks 10A and 10B are engaged with the side surfaces of the pinion 10P.
Therefore, the racks 10A and 10B and the pinion 10P constitute the transmission means 14 that always moves the racks 10A and 10B at equal distances from the pinion 10P in the opposite directions around the pinion 10P.

  A first sliding plate 11s is fixed to an end portion of the first rack 10A on the base end portion 10D side (back direction Y1). As shown in FIG. 3, the first sliding plate 11 s is slidably provided on the notch 10 c provided on the bobbin 10. A first engagement member 16 that is engaged with the back surface side of the first guide 11 protrudes from the first sliding plate 11s. The first guide 11 is attached to the bobbin 10 via the first engagement member 16.

  On the other hand, a second sliding plate 12s is fixed to the end of the second rack 10B on the side of the front end portion 10F (front side Y2). As shown in FIG. 5, the second sliding plate 12 s is slidably provided on the notch 10 c provided on the bobbin 10. The second sliding plate 12s is provided with a second engagement member 17 that engages with an engagement portion 12d provided on the contact end surface 12G side of the second guide 12 and an engagement prevention portion 13 that will be described later. Yes.

  The engaging members 16 and 17 are provided at approximately the same distance from the center O of the notch 10c. As described above, since the racks 10A and 10B and the pinion 10P constitute the transmission means 14 for centering, the engaging members 16 and 17 always move at equal distances around the rotation center O of the pinion 10P.

As shown in FIG. 6A, the first guide 11 is fitted and attached to the bobbin 10 in advance. When the printing roll Lr is set on the bobbin 10 and pushed in toward the back direction Y1, the first engagement member 16 is pushed toward the back direction Y1 by the first guide 11 shown in FIG. With the movement of the first guide 11, the first rack 10A in FIG. 4A moves in the back direction Y1, and the pinion 10P is rotated. By rotation of the pinion 10P, the second rack 10B is moved in the front direction Y2, and as shown in FIG. 6B, the second engagement member 17 is moved in the front direction Y2.
As described above, when the first guide 11 is pushed into the base end portion 10D, the engaging members 16 and 17 are moved in directions away from each other.

On the other hand, when the second guide 12 shown in FIG. 7B is fitted into the bobbin 10 and pushed in the depth direction Y1, the second engaging member 17 shown in FIG. Is pushed toward the back direction Y1. As the second engagement member 17 moves, the second rack 10B moves in the back direction Y1, the pinion 10P rotates in the reverse direction, and the first rack 10A moves in the front direction Y2.
Therefore, as shown in FIGS. 6C and 7C, when the second guide 12 is pushed into the proximal end portion 10D, the first guide 11 is moved toward the distal end portion 10F, and both engaging members 16 are engaged. , 17 are moved toward each other to center the printing roll Lr.

Engagement prevention part 13;
Here, when the inner diameter of the printing roll Lr is substantially the same as that of the bobbin 10 shown in FIG. 3, the printing roll Lr is guided by the cylindrical outer peripheral surface of the bobbin 10, and the inner side of the printing roll Lr. The second engagement member 17 does not contact the circumference Li. However, when the inner diameter of the printing roll Lr is larger than the outer diameter of the cylindrical bobbin 10, the first end surface LA of the paper tube in the printing roll Lr comes into contact with the second engagement member 17 and the second engagement. There is a possibility that the member 17 is pushed in the back direction Y1 and the printing roll Lr cannot be set normally. Therefore, an engagement preventing portion 13 and a guide protrusion 10u described below are provided.

  As shown in FIG. 4B and FIG. 5, the engagement preventing portion 13 protrudes in the radial direction D of the bobbin 10 from the second engagement member 17 in the vicinity of the second engagement member 17. The engagement preventing portion 13 is formed so that the side surface thereof is substantially triangular.

  On the other hand, a guide protrusion 10u is protruded from the tip 10F of the notch 10c of the bobbin 10. As shown in FIG.4 (b), the height H of the engagement prevention part 13 and the guide protrusion 10u is set to the substantially same height.

  When the printing roll Lr in FIG. 5 is inserted into the bobbin 10, first, the guide protrusion 10u hits the inner periphery Li of the printing roll Lr, and the upper surface of the guide protrusion 10u shown in FIG. 4B is the inner periphery of the printing roll Lr. To guide you. When the printing roll Lr is further pushed in the back direction Y1, the inner circumference Li on the first end face LA side of the printing roll Lr is guided to the inclined surface 13a of the engagement preventing portion 13, and the inner circumference Li is guided by the engagement preventing portion. It is guided by 13 triangular apexes 13b and moved in the back direction Y1.

  Thus, since the engagement preventing portion 13 is provided so as to protrude in the radial direction D of the bobbin 10 with respect to the second engagement member 17, the print roll Lr is engaged with the second engagement member 17. The printing roll Lr can be inserted into the bobbin 10.

Loading the printing roll Lr:
For wide printing roll Lr;
As shown in FIG. 6A, when loading the wide printing roll Lr, the printing roll Lr is fitted into the bobbin 10 in which the first guide 11 is fitted, and as shown in FIG. The printing roll Lr is pushed in toward the base end portion 10D of the tenth.

  When the first guide 11 is pushed in the back direction Y1 by being pushed by the printing roll Lr, the first engaging member 16 is moved in the axial direction Y by the transmission means 14 in FIG. On the other hand, in synchronization with the movement of the first engagement member 16, the second engagement member 17 shown in FIG. 6B moves toward the front end portion 10F in the front direction Y2.

Thereafter, when the second guide 12 shown in FIG. 5 is fitted into the bobbin 10, the engaging portion 12 d of the second guide 12 is engaged with the second engaging member 17. By pushing the second guide 12 in the back direction Y1, the second engagement member 17 moves toward the back direction Y1, and the second engagement member 17 is moved by the transmission means 14 in FIG. Synchronously, the first engagement member 16 moves in the front direction Y2 toward the distal end portion 10F side of the bobbin 10.
Therefore, the printing roll Lr is centered in the axial direction Y of the bobbin 10 as shown in FIG.

For narrow printing roll Lr;
As shown in FIG. 7A, when loading a narrow print roll Lr, the print roll Lr is inserted into the bobbin 10 and the print roll Lr is pushed in the back direction Y1.

  After the printing roll Lr is inserted, when the second guide 12 is inserted into the bobbin 10 as shown in FIG. 7B, the engaging portion 12d of the second guide 12 is inserted into the second engaging member 17 shown in FIG. Engage. As shown in FIG. 7B, when the second guide 12 is pushed toward the back direction Y1, the second engagement member 17 shown in FIG. 4A moves in the back direction Y1 together with the second guide 12. .

  Synchronously with the movement of the second engagement member 17 in the back direction Y1, the first engagement member 16 moves in the front direction Y2, and as shown in FIG. 7C, the print roll Lr is moved to the bobbin. 10 centered in the axial direction Y.

Thus, since the two engaging members 16 and 17 are moved in synchronization with each other and the guides 11 and 12 are engaged with the engaging members 16 and 17, the printing roll Lr is moved to the bobbin 10. Centered above. Therefore, high-speed and high-precision printing is possible.
Further, when the printing roll Lr is loaded, since the second engaging member 17 is engaged with the second guide 12 without being engaged with the printing roll Lr, centering is performed only by pushing the printing roll Lr together with the second guide 12. The Accordingly, it is not necessary to perform any centering operation when the printing roll Lr is loaded.

8 to 11 show the second embodiment.
As shown in FIG. 8, the bobbin 10 is formed in a substantially cylindrical shape.
As shown in FIGS. 8 and 9A, the first and second guides 11 and 12 are mounted with the first and second attachments 11A and 12A. The attachments 11A and 12A are each provided with a plurality of (several or many) claws 15 radially in the radial direction of the attachments 11A and 12A.

As shown in FIG. 11 (a), each of the claws 15 has a substantially triangular (tapered) side shape so that the diameter of each claw 15 decreases in the direction of approaching each other.
On the other hand, on the outer periphery of the bobbin 10, a plurality of guide grooves 10 h that guide the claw 15 along the axial direction Y are formed for each claw 15.

  A bobbin 10 shown in FIG. 8 houses a transmission means 14 for centering both guides 11 and 12. The transmission means 14 has a rack and a pinion as in the first embodiment, and the engagement members 16 and 17 are fixed to each rack. The engaging members 16 and 17 are provided so as to be movable in the axial direction Y along the guide groove 10h. When the attachments 11A and 12A are engaged with the engaging members 16 and 17, respectively, Centering of both guides 11 and 12 is performed.

  As shown in FIG. 10, springs S are built in the guides 11 and 12, and the attachments 11A and 12A are urged toward the contact with the print roll Lr by the spring force of the springs S. ing.

  When the inner circumference Li of the printing roll Lr is substantially equal to the outer diameter of the bobbin 10, the claw 15 in FIG. 9A is retracted inward of the guides 11 and 12, and the end faces LA and LB of the printing roll Lr are The print rolls Lr are held by the guides 11 and 12 in contact with the contact end faces 11G and 12G of the guides 11 and 12, respectively.

  On the other hand, when the inner circumference Li of the printing roll Lr is larger than the outer diameter of the bobbin 10, the claw 15 is fixed in a protruding state as shown by a two-dot chain line in FIG. The The claw 15 is automatically aligned by entering the inner circumference (hollow part) Li of the printing roll Lr, and the printing roll Lr is held.

Lock mechanism:
As shown in FIG. 10, each attachment 11 </ b> A, 12 </ b> A is formed with a sliding convex portion SB that slides in a concave guide portion GB formed in the guide 11, 12. On the other hand, in the guides 11 and 12, there is provided a stopper plate SP that fits between the guide part GB and the sliding convex part SB and can fix the attachments 11A and 12A in a protruding state. The stopper plate SP is provided with a fixing knob 15 a provided on the outer periphery of the guides 11 and 12.

  When the claw 15 is fixed in the protruding state, the fixing button 15a is moved in the circumferential direction of the guides 11 and 12, as indicated by a two-dot chain line in FIG. Due to the movement of the fixed button 15a, the stopper plate SP rotates in the guides 11 and 12 and enters between the guide part GB and the sliding convex part SB. Thus, when the stopper plate SP enters between the guide portion GB and the sliding projection SB, the attachments 11A and 12A are fixed, and the claw 15 is fixed in the protruding state.

Placement of the nails 15:
Here, as shown in FIG. 11B, when the guides 11 and 12 are brought close to each other, the claw 15 of the first attachment 11A and the claw 15 of the second attachment 12A are adjacent to each other. It arrange | positions so that it may enter between the nail | claws 15 and it may mutually wrap in the axial direction Y of the bobbin 10. FIG.
Therefore, it is possible to hold the printing roll Lr having different inner diameters, and it is also possible to hold the printing roll Lr having a very narrow width.

  Other configurations are the same as those in the first embodiment, and the same reference numerals are given to the same or corresponding portions, and detailed description thereof is omitted.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the first and second guides do not necessarily have a disc shape. Further, the first and second guides may be reduced in weight by forming ribs or holes.
In the above-described embodiment, the centering mechanism using a rack and a pinion is illustrated as an example of the transmission means. However, as the transmission means, a mechanism for moving the first and second engaging members in synchronization with each other in opposite directions. If it is.
Accordingly, such changes and modifications are to be construed as within the scope of the invention as defined by the claims.

  This apparatus can be used in a printer that performs printing on printing paper.

1A is a schematic side view showing a printer according to a first embodiment of the present invention, and FIG. 1B is a schematic plan view showing an example of printing paper used in the printer. It is a schematic side view showing the conveyance unit and the vicinity of the printing unit. It is a schematic perspective view which shows the holding structure of a printing roll. (A) is a schematic plan view which shows a transmission means, (b) is a schematic side view which shows the front-end | tip part of an unwinding axis | shaft. It is a schematic perspective view which shows an unwinding axis | shaft and a 2nd guide. It is a schematic perspective view which shows the centering method of a wide printing roll. It is a schematic perspective view which shows the centering method of a narrow printing roll. It is a schematic perspective view which shows the holding structure of the printing roll concerning Example 2 of this invention. (A) is a schematic perspective view which shows the protrusion state of an attachment, (b) is a schematic perspective view which shows the retracted state of an attachment. It is a schematic perspective view which shows the guide of the state which removed the back plate. It is a schematic perspective view which shows holding | maintenance operation | movement of a 1st and 2nd guide.

Explanation of symbols

1: Label printer 10: Bobbin (unwinding shaft)
10c: Notch portion 10D: Base end portion of unwinding shaft 11: First guide 12: Second guide 11A: First attachment 12A: First attachment 13: Engagement prevention portion 14: Transmission means 15: Claw 16: First Engagement member 17: Second engagement member 50: Printing portion L: Printing paper LA: First end surface of printing roll LB: Second end surface of printing roll Li: Inner circumference (hollow portion)
Lr: Print roll Y: Axial direction

Claims (6)

A printer comprising an unwinding shaft that can unwind printing paper from a printing roll wound in a hollow cylindrical shape at the center, and a printing unit that performs printing on the printing paper unwound from the unwinding shaft Because
A first guide that is provided movably in the axial direction of the unwinding shaft on the proximal end side of the unwinding shaft, and that contacts the first end surface of the printing roll;
A second guide that is detachably provided on a tip end side of the unwinding shaft and contacts a second end surface of the printing roll;
A first engagement member that is movably attached in the axial direction of the unwinding shaft and engages with the first guide;
A second engagement member attached to be movable in the axial direction of the unwinding shaft and engaged with the second guide;
Transmission means for moving the first and second engaging members synchronously in opposite directions;
The print roll can be inserted into the unwinding shaft until the first end surface of the print roll comes into contact with the first guide without the print roll engaging with the second engagement member. Printer.   2. The transmission device according to claim 1, wherein when the first guide is pushed toward the proximal end side, both the engaging members are moved away from each other, and the second engaging member is moved through the second guide. A printer that moves the engaging members in a direction approaching each other when pushed into the end side. In Claim 1 or 2, the transmission means is accommodated in the unwinding shaft,
The second engaging member engages with the second guide so that the second engaging member does not engage with the inner periphery of the printing roll in a notch portion of the unwinding shaft formed by cutting out a part of a cylindrical shape. So that the printer is protruding.   4. The print roll according to claim 1, wherein the print roll protrudes more radially than the second engagement member in the vicinity of the second engagement member and contacts the inner circumference of the print roll. A printer further comprising an engagement preventing portion for preventing engagement with a member.   5. The first and second attachments according to claim 1, wherein the first and second attachments having a diameter larger than an outer diameter of the unwinding shaft and entering and contacting the hollow portion of the printing roll are respectively the first and second attachments. A printer provided on a guide, wherein each attachment can be retracted outward from a contact end face of each guide, and can be fixed in a state of protruding from each guide toward a print roll.   5. The first and second elements according to claim 1, comprising a plurality of radially provided claws, entering and contacting the hollow portion of the printing roll and having a diameter that decreases in the direction of entry. A printer in which attachments are provided on the first and second guides, respectively, and the first attachment and the second attachment can be arranged by being wrapped in the axial direction.

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