JPH0730350Y2 - Transcription plate making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field This invention is drawn between a thermal head and a platen roller that are urged by an urging member and pressed against each other, and pulled out from a base paper roll that is arranged in parallel with the thermal head and the platen roller. The present invention relates to a copy-making plate making apparatus that sandwiches and conveys a raw paper sheet, and in this conveyed state, punches the raw paper sheet by a heating element portion of a thermal head.

(2) Prior Art When the base paper roll is replaced by the above-mentioned copy-making plate making apparatus, the pressure of the thermal head and the platen roller is released, but after the replacement, the plate is made with the pressure released by forgetting the return of the pressure. However, the base paper was jammed, and as a result, it was necessary to stop the drive of the apparatus and investigate the cause of the jam.

(3) Purpose This invention eliminates the drawbacks of the above-mentioned conventional ones, and even when forgetting to restore the pressure of the thermal head and the platen roller, it is possible to restore the pressure based on the pressure when performing plate making. It is an object of the present invention to provide a transcription plate making apparatus capable of reliably preventing a jam of a base paper.

(4) Configuration In order to achieve the above-mentioned object, the transcription plate making apparatus of the present invention comprises:
A covering cover displaceably provided at an open position and a closed position above the base paper roll, and a thermal head and a platen roller against the biasing force of the biasing member when the cover is at the open position. A pressure adjusting member provided so as to be displaceable between a first position where the pressure can be released and a second position where the pressure cannot be released. When the pressure adjusting member is in the first position, the cover is opened. When it is displaced from the position to the closed position, it is displaced in conjunction with the first position to the second position.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a platen roller, and its outer layer portion 1a is made of a non-adhesive elastic body such as silicon rubber or silicon fluoride rubber. Platen roller 1 is thermal head 2
The head is rotatably supported by a bearing or the like (not shown) so that the contact portion with the heating element portion 2a on the head 2 is on the heating element portion 2a. The thermal head 2 is fixed to one end of a bracket 3 rotatably installed via a pivot, and a spring 4 for urging the thermal head 2 toward the platen roller 1 is provided at the other end of the bracket 3 as a machine frame. Installed between.

Reference numeral 5 is a base paper, which is sandwiched between the thermal head 2 and the platen roller 1 which are pressed against each other by a spring 4 and conveyed, and is perforated by a heating element portion 2a of the thermal head 2 in the conveyed state.

A feed roller 11 and a pressure roller 12 are disposed on the discharge side of the platen roller 1 and the thermal head 2 of the base paper 5 via a pair of upper and lower guide plates 7 and 8. 9 is a cutter. Reference numeral 21 is a pressure adjusting lever for adjusting the pressure of the thermal head 2 against the platen roller 1 against the biasing force of the spring 4, and the first position indicated by a chain line capable of releasing the pressure and the solid line not releasing the pressure are shown. The second position is pivotable about the pivot 22.

An arcuate projection piece 23 is fixed near the pivot 22 of the pressure adjusting lever 21, and a lower edge portion of the projection piece 23 is formed into a tapered pressing portion 24. The thermal head 2 on the opposite side of the bracket 3 is provided with a downward piece 26, and the downward piece 26 is provided with an opening 27 into which the projecting piece 23 can be inserted by swinging the pressure adjusting lever 21.
Moreover, the lower edge portion of the opening 27 receives the pressing force of the pressing portion 24 of the inserted protruding piece 23.

Reference numeral 30 is a document reading device as a cover, which is a guide roller 31.
Guided by the thermal head 2 and platen roller 1
And a closed position that covers the base paper roll take-out opening above the base paper roll 32 juxtaposed with each other as shown by a chain line, and the base paper roll take-out opening is opened as shown by a solid line to open the base paper roll 32 from here. It can be moved to the open position where it can be taken out.

When the document reading device 30 is in the closed position, the document reading device 30 can engage with the upper end portion 21a of the pressure adjusting lever 21 in the second position to disable the swinging of the pressure adjusting lever 21 toward the first position. When in the open position, the pressure adjusting lever 21 moves from the second position to the first position.
It is possible to swing to the position and not to engage with the upper end portion 21a of the pressure adjusting lever 21 that has swung to the first position.

In the above structure, in order to release the pressure of the thermal head 2 on the platen roller 1 for replacing the base paper roll 32, first, the original reading device 30 is moved to the left in FIG. After setting the opened open position, the pressure adjusting lever 21 is swung from the second position to the first position. By this swinging, the lower edge portion of the opening 27 of the downward piece 26 is pushed by the pressing portion 24 of the protruding piece 23 of the pressure adjusting lever 21 inserted in the opening, and the thermal head 2 is bracketed by the pressing. 3 is rotated about the pivot axis of the thermal head 2 against the biasing force of the spring 4, and the platen roller 1 of the thermal head 2 is rotated.
The pressure on is released. After releasing this pressure, the base paper roll
32 is taken out from the opened opening for taking out the base paper roll.

After taking out the base paper roll 32, in order to re-apply the pressure to the platen roller 1 by the thermal head 2, the pressure adjusting lever
21 is swung from the first position to the second position, and the pressing of the protrusion 23 of the pressure adjusting lever 21 to the lower edge of the opening 27 is released. As a result, the thermal head 2 again receives the biasing force of the spring 4, and the platen roller 1 is pressed. When the original reading device 30 is moved to the right in FIG. 1 to the closed position where the opening for taking out the raw paper roll is closed, the upper end 21a of the pressure adjusting lever 21 can be engaged with the reading device 30. As a result, there is no chance of deviatingly swinging to the first position side, and the locked state is achieved. Further, in the above case, even if the pressure adjusting lever 21 is forgotten to be swung from the first position to the second position, when the document reading device 30 is moved to the right, the end portion 30a thereof has the upper end portion 21a of the lever 21. The lever 21 is reliably swung to the second position and the pressure on the platen roller 1 is automatically restored.

FIG. 2 shows another embodiment of the present invention. In this embodiment, the document reading device 30 is vertically swingable, and when the pressure on the platen roller 1 is automatically returned, the reading device 30 The lower end of the pressure adjusting lever 21
This is basically different from the above-described embodiment in that the pressure adjusting lever 21 can be reliably swung to the second position indicated by the solid line by pressing. Since the configuration of the other parts is the same as that of the above-mentioned embodiment, the same parts are designated by the same reference numerals, and their operation and description will be omitted.

(5) Effects Since the invention adjusts the pressure adjusting member to the covering cover as described above, even if the pressure of the thermal head and the platen roller is forgotten to be restored, the covering cover is set to the closed position to reduce the pressure. It has an excellent effect that it can be restored to the original state and that the jam of the base paper at the time of plate making can be surely prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a front view showing another embodiment. 1 ... Platen roller, 2 ... Thermal head 4 ... Spring, 5 ... Base paper 21 ... Pressure adjusting lever, 30 ... Original reading device

Claims (1)

[Scope of utility model registration request] 1. A base paper drawn from a base paper roll arranged in parallel with the thermal head and the platen roller is sandwiched and conveyed between a thermal head and a platen roller which are urged by a urging member to come into pressure contact with each other. In the transcription plate making apparatus for punching the base paper by the heating element of the thermal head in the state, the covering cover provided displaceably between the position where the upper part of the base paper roll is opened and the position where the upper part is closed, and the cover is opened. At one time, a pressure adjusting member provided so as to be displaceable between a first position where the pressure of the thermal head and the platen roller can be released and a second position where the pressure cannot be released against the urging force of the urging member. The pressure adjusting member is
When the cover is in the position, when the cover is displaced from the open position to the closed position, the cover is displaced in conjunction with the first position to the second position.