JP2019209555A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of improving maintenance workability. A printer includes a thermal head that prints on a print medium, a platen roller that is provided at a position facing the thermal head and that conveys the print medium, and a biasing unit that biases the thermal head toward the platen roller. A printing unit having a thermal head and a biasing unit, a cover that houses the printing unit, an engaging unit that holds the printing unit in the position where the printing unit is housed, and a thermal head that resists the biasing force of the biasing unit. The engaging portion engages with the printing unit at the moved position, and the engagement margin of the engaging portion with respect to the printing unit decreases in association with the operation of the thermal head moving forward and backward with respect to the platen roller. And a holding mechanism that adjusts so. [Selection diagram] Figure 2

Description

  The present invention relates to a printer.

  Patent Document 1 discloses a thermal transfer type printer that heats an ink ribbon and transfers ink on the ink ribbon onto a print medium for printing.

  The printer includes a main body whose upper portion is opened, an upper lid portion that covers the upper portion of the main body, and a printing unit that is disposed between the main body and the upper lid portion. In a state where the printing unit is fitted to the upper lid portion, the printing unit is held on the upper lid portion by the elastic member. For example, when performing maintenance work to replace the ink ribbon, the upper lid is swung to open the upper part of the main body, and after releasing the holding of the printing unit by the elastic member, the printing unit is swung to be exposed from the upper lid. It is supposed to let you.

JP 2009-179010 A

  In the printer of Patent Document 1, since it takes time to release the holding of the printing unit by the elastic member during maintenance work, workability is not good.

  An object of the present invention is to provide a printer capable of improving maintenance workability.

  According to an aspect of the present invention, a thermal head that performs printing on a printing medium, a platen roller that is provided at a position facing the thermal head, and that conveys the printing medium, and the thermal head is attached to the platen roller. An urging portion for urging, a printing unit having the thermal head and the urging portion, a cover for accommodating the printing unit, an engaging portion for holding the printing unit in a position for accommodating the printing unit, At the position where the thermal head moves against the urging force of the urging portion, the engaging portion engages with the print unit, and the thermal head is moved by the urging force of the urging portion. And a holding mechanism for releasing the engagement of the engaging portion with respect to the print unit.

  According to the present invention, maintenance workability in the printer can be improved.

FIG. 1 is a perspective view of a printer 100 according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of the printer 100 according to the embodiment of the present invention. FIG. 3 is a schematic configuration diagram illustrating a state where the cover 11 is opened. FIG. 4 is a schematic configuration diagram showing a state in which the partition member 25 is opened. FIG. 5A is a schematic configuration diagram showing the holding mechanism 50. FIG. 5B is a schematic configuration diagram showing the operation of the holding mechanism 50.

  Hereinafter, a printer 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  The printer 100 is a thermal transfer type printer that performs printing by heating the ink ribbon R and transferring the ink of the ink ribbon R to the printing medium M. The printing medium M is, for example, a continuous label body in which a plurality of labels are temporarily attached to a belt-like mount at predetermined intervals.

  As shown in FIGS. 1 and 2, the printer 100 includes a housing 10 and a cover 11 that covers an opening of the housing 10.

  As shown in FIG. 2, the print medium M is held on the medium supply shaft 12 while being wound in a roll shape. As the printing medium M, a label without a mount or a fanfold type medium can be used.

  The cover 11 is supported by a support shaft 13 provided in the housing 10 so that the end on one end side thereof is swingable. The cover 11 swings around the support shaft 13 as a fulcrum, thereby closing the opening of the housing 10 (see FIG. 2) and the opening position of opening the opening of the housing 10 (FIGS. 3 and 3). 4).

  The housing 10 is provided with a lock mechanism (not shown) that maintains the cover 11 in a closed state. The lock mechanism is released by operating the lever 14 shown in FIG.

  A discharge port 16 through which the print medium M printed by the print unit 15 shown in FIG. 2 is discharged from the printer 100 is formed between the end of the cover 11 on the other end side and the housing 10.

  A cutter 17 facing the discharge port 16 is attached to the cover 11. The cutter 17 cuts the printed print medium M discharged from the discharge port 16. Various other units can be attached to the cover 11 instead of the cutter 17.

  The cover 11 is provided with an operation unit 19 for operating the printer 100. The operation unit 19 includes various operation buttons, a display, a short-range wireless communication module, an LED, and the like. The display may be a touch panel.

  As shown in FIG. 2, a printer unit 30 for printing on the print medium M is accommodated in the printer 100.

  The printing unit 30 includes a main body 31 that is supported at one end by a support shaft 13 in a swingable manner, and a thermal head 32 that is attached to the main body 31.

  The thermal head 32, together with the platen roller 20 provided on the housing 10 side, constitutes the printing unit 15 that performs printing on the printing medium M.

  The printing unit 30 also includes a ribbon supply shaft 33 that holds the ink ribbon R supplied to the printing unit 15 in a roll shape, a ribbon take-up shaft 34 that winds up the used ink ribbon R, an ink ribbon R, and printing. A partition member 25 that partitions the medium M, a guide shaft 36 (see FIG. 4) that defines a transport path of the ink ribbon R from the ribbon supply shaft 33 to the printing unit 15, and a ribbon take-up shaft 34 from the printing unit 15. And a guide shaft 37 that defines the transport path of the ink ribbon R to the head. The ribbon supply shaft 33 is detachably attached to the partition member 25.

  The print medium M is supplied from the medium supply shaft 12 to the print unit 15 and is sandwiched between the thermal head 32 and the platen roller 20 together with the ink ribbon R.

  When the print medium M and the ink ribbon R are sandwiched between the thermal head 32 and the platen roller 20, that is, when the print unit 30 is in the print position, the heating element of the thermal head 32 is energized. The ink on the ink ribbon R is transferred to the print medium M by the heat of the heating element, and printing on the print medium M is performed.

  When the platen roller 20 is rotated forward by a platen drive motor (not shown), the printing medium M and the ink ribbon R are conveyed downstream in the conveying direction, and the printing medium M is discharged from the discharge port 16 to the outside of the printer 100. Discharged.

  The ribbon supply shaft 33 and the ribbon take-up shaft 34 are also rotationally driven by gears (not shown) by drive motors (not shown).

  The printing unit 30 swings with the cover 11 with the support shaft 13 as a fulcrum with respect to the housing 10, so that the printing medium M is held in the housing 10 and the print medium M is sandwiched between the thermal head 32 and the platen roller 20. The printing position (see FIG. 2) and the non-printing position (see FIG. 3) where the thermal head 32 is separated from the platen roller 20 are switched. Further, the printing unit 30 swings with respect to the cover 11 with the support shaft 13 as a fulcrum, so that the main body portion 31 is accommodated in the cover 11 (see FIGS. 2 and 3) and a part of the main body portion 31. Is switched to the exposure position where the cover 11 is exposed (see FIG. 4).

  The partition member 25 is swingably supported with respect to the main body 31 by the swing shaft 26. The partition member 25 swings with respect to the main body 31 with the swing shaft 26 as a fulcrum, thereby closing the print unit 30 (see FIG. 3) and opening the print unit 30 (see FIG. 4). ) And can be switched to.

  Both ends of the ribbon supply shaft 33 are supported by the two support portions 28 with respect to the partition member 25 so as to be rotatable and detachable.

  The rocking shaft 26 is provided with a locking portion 27 that protrudes from the center portion thereof. The cover 11 is provided with a locked portion 18 with which the locking portion 27 engages.

  When printing by the printer 100 is performed, as shown in FIG. 2, the cover 11 is in a closed state in which the opening of the housing 10 is closed.

  When performing maintenance or the like of the printer 100, the cover 11 is swung from the closed position shown in FIG. 2 to the open position shown in FIG. Thereby, the opening part of the housing | casing 10 is open | released and the maintenance operation | work of the setting of the printing medium M to the printer 100 and each part in the housing | casing 10 can be performed.

  When the partition member 25 is swung from the closed position shown in FIG. 3 to the open position shown in FIG. 4, the roll-shaped ink ribbon R held by the ribbon supply shaft 33 and the ribbon supply shaft 33 is transferred to the ribbon take-up shaft 34. And is exposed to the discharge port 16 side of the print medium M.

  Due to the operating force that swings the partition member 25 from the closed position to the open position, the locking portion 27 and the locked portion 18 of the swing shaft 26 are elastically deformed, and the engagement therebetween is released. When the engagement between the locking portion 27 of the swing shaft 26 and the locked portion 18 is released, the printing unit 30 itself swings toward the housing 10 to a predetermined exposure position. The predetermined exposure position is a position where a swing restricting portion (not shown) provided in the vicinity of the support shaft 13 in the housing 10 and the main body portion 31 abut.

  The positioning of the print unit 30 by the swing restricting portion is such that when the print unit 30 is swung toward the housing 10 with an operation force equal to or greater than a predetermined torque, the swing restricting portion is elastically deformed and the main body 31 is swung. It is canceled after overcoming the dynamic regulation department.

  In this way, the partition member 25 and the printing unit 30 are switched from the state shown in FIG. 3 to the state shown in FIG. As a result, the ribbon supply shaft 33 and the ribbon take-up shaft 34 are arranged at a ribbon replacement position that can be detached from the printer 100, and the ink ribbon R can be replaced.

  When the partition member 25 is swung from the open position shown in FIG. 4 toward the cover 11, the partition member 25 is switched to the closed position shown in FIG. 3, and the locking portion 27 of the swing shaft 26 is locked. The portions 18 are elastically deformed to engage with each other. When the locking portion 27 of the swing shaft 26 and the locked portion 18 are engaged, the printing unit 30 is held at the storage position in which the printing unit 30 is accommodated in the cover 11.

  Note that the engaging portion between the locking portion 27 of the swing shaft 26 and the locked portion 18 has a small moment arm with respect to the swing fulcrum of the printing unit 30 (the axis of the swing shaft 26), and thus the partition member 25. The engagement is easily released by an operating force that swings from the closed position to the open position.

  On the other hand, it is preferable that the printing unit 30 is securely held with respect to the cover 11 in order to stabilize the operation during the printing operation. Therefore, the printer 100 includes a locked portion 35 provided on the swing end side of the printing unit 30 and a hook 51 with which the locked portion 35 is engaged. In a state where the cover 11 is in the closed position (see FIG. 2) or the open position (see FIG. 3), the locked portion 35 on the swing end side and the hook 51 are engaged with each other, so that the print unit 30 is covered with the cover 11. It is securely held in a storage position that fits inside.

  As shown in FIG. 1, inside the cover 11, a pair of hooks 51 are disposed on the discharge port 16 side. A pair of locked portions 35 that engage with the respective hooks 51 are arranged on the swing end side of the printing unit 30. The two sets of hooks 51 and the locked portion 35 are provided on both side portions that are separated from each other in the axial direction of the support shaft 13 that is a fulcrum for the cover 11 to swing. As a result, the printing unit 30 in the housing position within the cover 11 is held at two locations separated in the oscillation axis direction at the oscillation end away from the support shaft 13, thereby maintaining a stable posture.

  As shown in FIGS. 5A and 5B, the hook 51 is attached to the inside of the cover 11. The locked portion 35 is provided in the main body portion 31 of the printing unit 30. 5A and 5B are illustrated with a part of the printer 100 omitted for simplification of description.

  The hook 51 includes a base end portion 52 that is fixed to the cover 11, a spring portion 53 that extends from the base end portion 52 toward the opening of the cover 11, and a locking portion that bends in a hook shape from the tip of the spring portion 53. 54. The hook 51 is usually formed from a resin material (elastic material) used for industrial products.

  As shown in FIG. 5A, the hook 51 is engaged with the locked portion 35 in a free state in which the spring portion 53 is hardly elastically deformed. As a result, the printing unit 30 is held in the storage position (see FIGS. 2 and 3) stored in the cover 11.

  On the other hand, the hook 51 is elastically deformed so that the spring portion 53 bends as shown in FIG. 5B, thereby reducing the engagement margin S with which the locking portion 54 is engaged with the locked portion 35. The engagement with the stop 35 is released. As a result, the printing unit 30 can be switched from an accommodation position (see FIGS. 2 and 3) accommodated in the cover 11 to an exposure position (see FIG. 4) exposed from the cover 11.

  The printer 100 includes a holding mechanism 50 that releases the engagement of the hook 51 with the locked portion 35 in conjunction with the opening operation of the cover 11. When the operator performs an operation to open the cover 11, the holding mechanism 50 is operated as will be described later, whereby the printing unit 30 can be easily switched from the accommodation position in the cover 11 to the exposure position. It becomes like this.

  The holding mechanism 50 includes a head bracket 61, a spring 59, a push arm 55, and a guide unit 38 that are provided in the printing unit 30.

  The head bracket 61 is slidably supported on the main body 31 via a guide member (not shown). The head bracket 61 has a mounting seat 63 to which the thermal head 32 is attached and a recess 62 that engages with the outer periphery of the bearing portion 21 of the platen roller 20. The thermal head 32 is supported by the head bracket 61 so as to advance and retreat at a predetermined position with respect to the platen roller 20.

  The coiled spring 59 is compressed and disposed between the main body 31 and the head bracket 61. As shown in FIG. 5A, in a state where the cover 11 is in the closed position, the spring 59 biases the thermal head 32 in a direction in which the thermal head 32 is pressed against the platen roller 20 via the print medium M.

  The push arm 55 is attached to the head bracket 61. The push arm 55 includes an annular fitting portion 56 that is rotatably fitted to the shaft portion 64 of the head bracket 61, and an arm portion 57 that extends from the fitting portion 56 in the radial direction of the shaft portion 64. . The push arm 55 is usually formed from a resin material (elastic material) used for industrial products.

  The guide portion 38 is formed in a convex shape that protrudes from the main body portion 31 to face the push arm 55. The guide portions 38 are arranged at intervals in the locked portions 35. A gap into which the arm portion 57 of the push arm 55 is inserted is formed between the guide portion 38 and the locked portion 35. The guide portion 38 causes the push portion 55 to pivot about the shaft portion 64 by sliding the arm portion 57 and guides the tip portion 57 a of the arm portion 57 toward the tip portion 51 a of the hook 51.

  Next, the operation of the holding mechanism 50 will be described with reference to FIGS. 5A and 5B. 5A and 5B, the cover 11 is switched from the closed position to the open position, and the holding mechanism 50 operates so as to release the engagement of the hook 51 with the locked portion 35.

  In the state shown in FIG. 5A, the cover 11 is in the closed position and the print unit 30 is in the print position. The head bracket 61 moves into the cover 11 by compressing the spring 59 when the thermal head 32 contacts the platen roller 20. As a result, the push arm 55 is in a retracted position away from the hook 51, and the engaged state in which the engagement allowance S reaches the maximum value is maintained. Thereby, the printing unit 30 is reliably held at the printing position, and the operation of the printer 100 is smoothly performed.

  When the operator operates the lever 14 (see FIG. 1) to release the holding of the cover 11 by the lock mechanism (not shown), the cover 11 swings with respect to the housing 10 as shown by an arrow A in FIG. Then, the closed position shown in FIG. 5A is switched to the open position shown in FIG. 5B. At this time, the head bracket 61 moves in a direction protruding from the cover 11 toward the housing 10 by the biasing force of the spring 59 as indicated by an arrow B in FIG. 5B. At the same time, the push arm 55 rotates with the shaft portion 64 as a fulcrum while the arm portion 57 is slidably contacted with the guide portion 38, and the distal end portion 57 a of the arm portion 57 pushes the distal end portion 51 a of the hook 51. The engagement of the hook 51 with respect to is released. This eliminates the need for the operator to release the engagement with the locked portion 35 with the hook 51.

  5B, when the hook 51 is disengaged from the print unit 30, the print unit 30 is moved into the cover 11 by the engagement between the locking portion 27 of the swing shaft 26 and the locked portion 18. Is held in the storage position.

  For example, when the ink ribbon R is exchanged, as shown in FIG. 3, the operator starts the partition member 25 from the state in which the cover 11 is in the open position and the print unit 30 is in the accommodation position in which the print unit 30 is accommodated in the cover 11. Oscillate in the opening direction (downward). Thereby, the latching | locking part 27 of the rocking | fluctuation shaft 26 and the to-be-latched part 18 are elastically deformed, and both engagement is cancelled | released. As a result, the printing unit 30 is switched to the exposure position where a part of the printing unit 30 is exposed from the cover 11 as shown in FIG. In this state, the ribbon supply shaft 33 and the ribbon take-up shaft 34 are disposed at a ribbon replacement position that can be detached from the printer 100, and the ink ribbon R is replaced.

  As described above, when the cover 11 is switched from the closed position to the open position, the hook 51 releases the engagement with the print unit 30 in conjunction with the movement of the thermal head 32 by the urging force of the spring 59. The printing unit 30 is automatically switched from the storage position to the exposure position. When the cover 11 is switched from the open position to the closed position, the hook 51 is engaged with the print unit 30 in conjunction with the movement of the thermal head 32 against the urging force of the spring 59. The printing unit 30 is automatically switched from the exposure position to the accommodation position.

  Next, the effect of this embodiment will be described.

  (1) According to the present embodiment, the thermal head 32 that performs printing on the printing medium M, the platen roller 20 that is provided at a position facing the thermal head 32 and conveys the printing medium, and the thermal head 32 is attached to the platen roller 20. A spring 59 (biasing portion) that urges toward the printer, a printing unit 30 having the thermal head 32 and the spring 59, a cover 11 that houses the printing unit 30, and a position in which the printing unit 30 is housed in the cover. The hook 51 engages with the print unit 30 at a position where the hook 51 (engagement portion) and the thermal head 32 move against the urging force of the spring 59, and the thermal head 32 is moved to the platen by the urging force of the spring 59. The hook 51 is engaged with the printing unit 30 in conjunction with the movement in the direction toward the roller 20. Comprises a holding mechanism 50 for releasing, the printer 100 is provided.

  With this configuration, in the printer 100, the printing unit 30 accommodated in the cover 11 is reliably held via the hook 51, and the printing operation can be stabilized. The hook 51 is disengaged from the printing unit 30 by the operation of the thermal head 32 moving forward and backward by the urging force of the spring 59, so that it is not necessary to operate the hook 51 by hand. The printing unit 30 is switched to the exposure position where it is exposed from the cover 11. Therefore, in the printer 100, the printing operation is stabilized and the maintenance workability is improved.

  (2) The holding mechanism 50 is configured to reduce the engagement margin S of the hook 51 with respect to the print unit 30 in conjunction with the movement of the thermal head 32 in the direction toward the platen roller 20 by the urging force of the spring 59. did.

  With this configuration, in the printer 100, when the cover 11 is switched from the closed position to the open position, the holding mechanism 50 switches to the temporary holding state in which the engagement margin S of the hook 51 with respect to the print unit 30 is reduced. Is possible. In this case, when the operator applies an operation force of a predetermined torque or more to the print unit 30 with the cover 11 switched from the closed position to the open position, the hook 51 is elastically deformed, and the hook 51 and the print unit 30 are moved. The engagement is released.

  (3) Further, according to the present embodiment, the head bracket 61 that is movably provided with respect to the printing unit 30 and supports the thermal head 32, and the push arm 55 that moves together with the head bracket 61 and drives the hook 51. A printer 100 is provided.

  With this configuration, in the printer 100, the push arm 55 that moves together with the head bracket 61 by the urging force of the spring 59 drives the hook 51. Thus, the movement of the head bracket 61 automatically adjusts the engagement margin of the hook 51 with respect to the printing unit 30.

  (4) According to the present embodiment, when the cover 11 opens the opening of the housing 10, the printer 100 that pushes the hook 51 to release the engagement of the hook 51 with the print unit 30 when the cover 11 opens the opening of the housing 10. Provided.

  With this configuration, in the printer 100, when the cover 11 is switched from the closed position to the open position, the head bracket 61 is moved by the urging force of the spring 59, and the push arm 55 that moves together with the head bracket 61 is hooked. 51 is driven in the release direction. In this way, the engagement of the hook 51 with the locked portion 35 is automatically adjusted by opening and closing the cover 11.

  (5) The holding mechanism 50 includes a guide portion 38 that guides the push arm 55 toward the hook 51.

  With this configuration, in the printer 100, when the cover 11 is switched from the closed position to the open position, the push arm 55 is guided by the guide portion 38 toward the hook 51 and hooks to the locked portion 35. The engagement allowance of 51 is automatically adjusted.

  (6) The push arm 55 includes a fitting portion 56 that is rotatably fitted to the shaft portion 64 of the head bracket 61, and an arm portion 57 that extends from the fitting portion 56 in the radial direction of the shaft portion 64. Have.

  With this configuration, in the printer 100, when the cover 11 is switched from the closed position to the open position, the push arm 55 is guided by the guide portion 38 while rotating around the shaft portion 64 as a fulcrum, and the hook 51. The engagement margin of the hook 51 with respect to the locked portion 35 is automatically adjusted.

  (7) Further, the hooks 51 are disposed at a plurality of locations separated from each other in the axial direction of the support shaft 13 (fulcrum) on which the printing unit 30 swings.

  In this way, the spacing between the hooks 51 is sufficiently provided in the axial direction of the support shaft 13 in which the cover 11 rotates, so that the printing unit 30 in the closed position is maintained in a stable posture.

  The embodiment of the present invention has been described above, but the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

DESCRIPTION OF SYMBOLS 100 Printer 10 Case 11 Cover 12 Medium supply shaft 13 Support shaft (fulcrum)
DESCRIPTION OF SYMBOLS 14 Lever 15 Printing part 16 Ejection port 17 Cutter 18 Locked part 19 Operation unit 20 Platen roller 21 Bearing part 25 Partition member 26 Oscillating shaft 27 Locking part 28 Support part 30 Printing unit 31 Main body part 32 Thermal head 33 Ribbon supply Shaft 34 Ribbon take-up shaft 35 Locked portion 36 Guide shaft 37 Guide shaft 38 Guide portion 50 Holding mechanism 51 Hook (engagement portion)
51a Front end portion 52 Base end portion 53 Spring portion 54 Locking portion 55 Push arm (linkage portion)
56 Fitting part 57 Arm part 57a Tip part 59 Spring (biasing part)
61 Head bracket 62 Recessed part 63 Mounting seat 64 Shaft part M Printing medium R Ink ribbon

According to an aspect of the present invention, a thermal head that performs printing on a printing medium, a platen roller that is provided at a position facing the thermal head, and that conveys the printing medium, and the thermal head is attached to the platen roller. An urging portion for urging, a printing unit having the thermal head and the urging portion, a cover for accommodating the printing unit, an engaging portion for holding the printing unit in a position for accommodating the printing unit, At the position where the thermal head moves against the urging force of the urging portion, the engaging portion engages with the printing unit, and the thermal head moves in conjunction with the movement of the platen roller. And a holding mechanism that adjusts the engagement portion of the engagement portion with respect to the print unit to be small .

(1) According to the present embodiment, the thermal head 32 that performs printing on the printing medium M, the platen roller 20 that is provided at a position facing the thermal head 32 and conveys the printing medium, and the thermal head 32 is attached to the platen roller 20. A spring 59 (biasing portion) that urges toward the printer, a printing unit 30 having the thermal head 32 and the spring 59, a cover 11 that houses the printing unit 30, and a position in which the printing unit 30 is housed in the cover. The hook 51 engages with the print unit 30 at a position where the hook 51 (engagement portion) and the thermal head 32 move against the urging force of the spring 59, and the thermal head 32 moves to the platen by the urging force of the spring 59. The hook 51 is engaged with the printing unit 30 in conjunction with the movement in the direction toward the roller 20. Comprises a holding mechanism 50 to be adjusted to S is reduced, the printer 100 is provided.

With this configuration, in the printer 100, the printing unit 30 accommodated in the cover 11 is reliably held via the hook 51, and the printing operation can be stabilized. When the cover 11 is switched from the closed position to the open position, the holding mechanism 50 can be switched to a temporary holding state in which the engagement margin S of the hook 51 with respect to the print unit 30 is reduced. In this case, if the operator applies an operation force of a predetermined torque or more to the print unit 30 with the cover 11 switched from the closed position to the open position, the hook 51 is elastically deformed, and the hook 51 and the print unit 30 are moved. The engagement is released, and it is not necessary to hold and operate the hook 51 by hand, and the printing unit 30 is switched to the exposed position where it is exposed from the cover 11. Therefore, in the printer 100, the printing operation is stabilized and the maintenance workability is improved.

(2) Further , according to the present embodiment, the holding mechanism that releases the engagement of the hook 51 with the print unit 30 in conjunction with the movement of the thermal head 32 in the direction toward the platen roller 20 by the biasing force of the spring 59. 50 is provided.

With this configuration, in the printer 100, the hook 51 is disengaged from the printing unit 30 by the operation in which the thermal head 32 advances and retreats with respect to the platen roller 20 by the biasing force of the spring 59. For this reason, it is not necessary to operate by holding the hook 51 by hand, and the printing unit 30 is switched to the exposure position where it is exposed from the cover 11. Therefore, in the printer 100, maintenance workability is improved.

(4) According to this embodiment, when the cover 11 opens the opening of the housing 10, the push arm 55 pushes the hook 51 so that the engagement allowance of the hook 51 with respect to the print unit 30 is reduced. A printer 100 is provided that adjusts or disengages .

With this configuration, in the printer 100, when the cover 11 is switched from the closed position to the open position, the head bracket 61 is moved by the urging force of the spring 59, and the push arm 55 that moves together with the head bracket 61 is hooked. 51 is driven in the release direction. In this way, the engagement margin S of the hook 51 with respect to the locked portion 35 is reduced by the operation of opening the cover 11, and it is automatically adjusted so that the engagement with the locked portion 35 is eventually released .

Claims (7)

A thermal head for printing on a print medium;
A platen roller that is provided at a position facing the thermal head and conveys the print medium;
A biasing portion that biases the thermal head toward the platen roller;
A printing unit having the thermal head and the urging portion;
A cover for accommodating the printing unit;
An engaging portion for holding the printing unit in a position to be accommodated in the cover;
The engagement portion engages with the print unit at a position where the thermal head moves against the urging force of the urging portion, and the thermal head moves by the urging force of the urging portion. A holding mechanism that interlocks and releases the engagement of the engagement portion with the print unit,
Printer. The printer according to claim 1,
The holding mechanism adjusts an engagement margin of the engagement portion with respect to the print unit in conjunction with an operation in which the thermal head advances and retreats with respect to the platen roller.
Printer. The printer according to claim 1 or 2,
A head bracket that is movably provided with respect to the printing unit and supports the thermal head;
A linkage portion that moves together with the head bracket to drive the engagement portion;
Printer. The printer according to claim 3,
A housing for accommodating the printing medium and the platen roller;
When the cover opens the opening of the housing, the linkage portion pushes the engagement portion to release the engagement of the engagement portion with the print unit;
Printer. The printer according to claim 3 or 4,
A guide portion that guides the linkage portion toward the engagement portion;
Printer. The printer according to claim 5,
The linkage part is
An annular fitting portion that is rotatably fitted to a shaft portion provided in the head bracket;
An arm portion extending in a radial direction of the shaft portion from the fitting portion,
Printer. A printer according to any one of claims 1 to 6,
The engaging portions are arranged at a plurality of locations separated from each other in the axial direction of a fulcrum on which the printing unit swings.
Printer.

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