JPH0535289U - Thermal transfer printer - Google Patents

Abstract

(57) [Abstract] [Purpose] In a thermal transfer printer including a printer main body and a rotary frame, it is possible to prevent the thermal head from being damaged by accidentally opening the rotary frame during printing. [Structure] The printer body 11 includes a thermal head 13
However, a platen roller 14 is attached to the rotating frame 12. At the time of printing, the latch lever 15 and the latch roller 16 are engaged with each other, and the thermal head 13 is pressed against the platen roller 14 by the pressing cam 19. A lock lever 23 is fixed to a shaft 24 of the latch lever 15. At the time of printing, since the lock lever 23 and the lock cam 21 lock the engagement between the latch lever 15 and the latch roller 16, even if the pull lever 17 is pulled, the rotating frame 12
Does not open.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermal transfer printer.

[0002]

[Prior Art]

 4 and 5 are cross-sectional views showing the structure of a conventional thermal transfer printer described in Japanese Utility Model Laid-Open No. 63-41551. The thermal transfer printer shown in FIG. 4 comprises a printer body 1 and a rotating frame 2 rotatably attached to the printer body 1. A thermal head 3 is attached to the printer body 1, and a platen roller 4 is attached to the rotating frame 2. Further, a latch lever 5 is attached to the printer body 1, and a latch roller 6 is attached to the rotating frame 2. As a result, the latch lever 5 and the latch roller 6 are engaged with each other, and the printer body 1 and the rotating frame 2 are integrated as shown in the figure. Then, the thermal head 3 presses the platen roller 4 to perform thermal transfer printing.

FIG. 5 shows a state in which the rotating frame 2 is rotated upward and the upper portion of the printer body 1 is opened. When the pull lever 7 is pulled up while the latch lever 5 and the latch roller 6 shown in FIG. 4 are engaged with each other, the engagement between the latch lever 5 and the latch roller 6 is released, and the rotating frame 2 is moved as shown in FIG. Rotate upwards. Other detailed description is omitted here.

[0004]

[Problems to be solved by the device]

 In the conventional thermal transfer printer described above, even when printing is performed, pulling up the pull lever 7 disengages the latch lever 5 and the latch roller 6 and the rotating frame 2 opens. Therefore, the thermal head 3 and the platen roller 4 may be separated from each other, and the expensive thermal head 3 may be damaged.

[0005]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the conventional technology, the present invention has a rotating frame that is rotatably attached to a printer body, and the rotating frame is rotated upward with respect to the printer body. At this time, in the thermal transfer printer in which the platen roller attached to the rotating frame and the thermal head attached to the printer main body are separated, the latch rollers attached to both sides of the rotating frame and the printer main body A latch lever rotatably mounted at a position facing the latch roller, a lock lever fixed coaxially with the latch lever, a pressing cam for pressing the thermal head against the platen roller, It is fixed at a position that is coaxial with the pressure cam and faces the lock lever, and the pressure cam pushes the thermal head. When the pressing cam does not press the thermal head, it works in cooperation with the lock lever to lock the engagement between the latch lever and the latch roller. In addition, the present invention provides a thermal transfer printer comprising a lock cam that unlocks the engagement between the latch lever and the latch roller.

[0006]

【Example】

 The thermal transfer printer of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing the construction of an embodiment of the thermal transfer printer of the present invention, and FIGS. 2 and 3 are partial perspective views for explaining the thermal transfer printer of the present invention.

First, the overall configuration of the thermal transfer printer of the present invention will be described with reference to FIG. A rotating frame 12 is attached to the printer body 11 so as to be rotatable around a shaft 11a. A thermal head 13 is attached to the printer body 11, and a platen roller 14 is attached to the rotating frame 12. Further, latch levers 15 are attached to both sides of the printer body 11 so as to be rotatable around a shaft 15a, and latch rollers 16 are provided on both sides of the rotating frame 12 at positions facing the latch levers 15. It is installed. Then, by engaging the latch lever 15 and the latch roller 16 with each other, the rotary frame 12 is fixed to the printer body 11, and the thermal head 13 is pressed against the platen roller 14 to perform printing.

The latch lever 15 is biased by a spring 18, and when the pull lever 17 is pulled, the latch lever 15 rotates about a shaft 15a, and the engagement between the latch lever 15 and the latch roller 16 is released. The rotating frame 12 can be opened as shown. When the rotating frame 12 is rotated upward, the thermal head 13 and the platen roller 14 are separated.

Further, a part that is the gist of the present invention will be described with reference to FIGS. 2 and 3. 2 shows a state where the latch lever 15 and the latch roller 16 are engaged, and FIG. 3 shows a state where the latch lever 15 and the latch roller 16 are disengaged. In FIG. 2, the thermal head 13 (not shown here) is pressed against the platen roller 14 (not shown here) by the pressing cam 19 via the pressing member 20. Both the pressing cam 19 and the lock cam 21 are fixed to the cam shaft 22, and are rotatable by a bearing (not shown). The lock lever 23 is fixed at a position facing the lock cam 22 of the shaft 24 of the latch lever 15.

FIG. 2 shows a state in which the thermal head 13 is pressed against the platen roller 14 (printing). At this time, the rotation position of the lock cam 21 is a position where it abuts on the lock lever 23. For this reason, the lock lever 23 and the latch lever 15 cannot rotate in the direction in which the latch roller 16 is disengaged. That is, the lock lever 23 and the lock cam 21 lock the engagement between the latch lever 15 and the latch roller 16. FIG. 3 shows the thermal head 13 separated from the platen roller 14. At this time, the rotation position of the lock cam 21 is a position where it does not contact the lock lever 23. Therefore, the lock lever 23 and the latch lever 15 can rotate in the direction in which the latch roller 16 is released. That is, the lock lever 23 and the lock cam 21 unlock the engagement between the latch lever 15 and the latch roller 16. Therefore, in the thermal transfer printer of the present invention, the rotating frame 12 does not open even if the pull lever 17 is accidentally pulled during printing, and the rotating frame 12 can be opened only during non-printing.

[0011]

[Effect of the device]

 As described in detail above, since the thermal transfer printer of the present invention is configured as described above, the rotating frame is automatically locked to the printer body during printing, and therefore the rotating frame may be opened during printing. It does not damage the thermal head. Also, because the latch roller is locked to the latch lever by directly interlocking with the pressing mechanism that presses the thermal head against the platen roller, the locking operation is reliable, and it can be realized with a simple component structure. It is extremely effective.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a thermal transfer printer of the present invention.

FIG. 2 is a partial perspective view illustrating a thermal transfer printer of the present invention.

FIG. 3 is a partial perspective view illustrating a thermal transfer printer of the present invention.

FIG. 4 is a sectional view showing a conventional thermal transfer printer.

FIG. 5 is a cross-sectional view showing a conventional thermal transfer printer.

[Explanation of symbols]

 11 Printer Main Body 12 Rotating Frame 13 Thermal Head 14 Platen Roller 15 Latch Lever 16 Latch Roller 19 Press Cam 21 Lock Cam 23 Lock Lever

Claims (1)

[Scope of utility model registration request] 1. A platen roller having a rotating frame rotatably attached to a printer body and attached to the rotating frame when the rotating frame is rotated upward with respect to the printer body. In a thermal transfer printer in which a thermal head attached to the printer main body and a thermal head attached to the printer main body are separated from each other, latch rollers mounted on both sides of the rotary frame, and rotatably mounted at a position facing the latch roller of the printer main body. Latch lever, a lock lever fixed coaxially with the latch lever, a pressing cam for pressing the thermal head against the platen roller, and a position coaxial with the pressing cam and facing the lock lever. It is fixed, and when the pressure cam is pressing the thermal head, it cooperates with the lock lever. Lock the engagement between the latch roller and the latch lever, when the pressure cam is not pressing the thermal head,
A thermal transfer printer comprising: a lock cam that cooperates with the lock lever to unlock the engagement between the latch lever and the latch roller.