JPS6147281A - Thermal transfer recording apparatus - Google Patents

Abstract

PURPOSE:To prevent the adsorption and involving of an ink sheet by image receiving paper, by providing a means for preventing the reversion of the ink sheet when the pressing force of a thermal head to a platen roll is released and a means for preventing the supply of the ink sheet. CONSTITUTION:When the printing of image receiving paper 10 corresponding to one sheet is finished, a control signal S3 is outputted to a drive circuit 106 from a control circuit 106 before a platen roll 12 is separated from an ink sheet 20, to drive a solenoid apparatus 102 and a plunger is engaged with the recessed part of an engagement member 100. Constant tension is imparted to the ink sheet 20 by the action of a wind-up roller 24 apt to rotate to the direction shown by the arrow F2 and that of a supply roller 22 of which the rotation in the direction shown by the arrow F3 is stopped. Therefore, when a thermal head 28 is moved downwardly after the completion of printing to release the grasping pressure with the platen roll 12, the ink sheet 20 is prevented from being electrostatically adsorbed by and wound around the surface of the image receiving paper 10 set to the outer periphery of the platen roller 10.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a thermal transfer recording apparatus K that performs recording by thermally transferring ink on an ink sheet to a predetermined image receiving paper. In particular, this invention relates to improvements in ink sheet supply means.

[Background of the invention]

As a conventional thermal transfer recording device, there is one shown in FIG. 2, for example. Further, other parts of the apparatus shown in FIG. 2 except for the platen roll portion are shown in FIG. 3. In these FIGS. 2g2 and 3, a recording paper (hereinafter simply referred to as "image receiving paper") 10 on which predetermined recording is performed is wound around a platen roll 12. As shown in FIG. In detail,
An L-shaped cutout 14 is formed along the longitudinal direction in a part of the circumferential surface of the platen roll 12, and a rod-shaped holding member 16 is provided in this part. This holding member 1
One end of the image receiving paper 10 is held between the paper 6 and the cut surface of the cut section 14, and is further wound around the curved surface of the platen roll 12. A rotary drive motor 18 is connected to the shaft of the platen roll 12, and the platen roll 12 is thereby rotated in the direction of the arrow F1.

Next, the ink sheet 20 is placed close to the platen roll 12.
is located. This ink sheet 20 is wound up from a supply roller 22 to a take-up roller 24 . That is, a motor 26 for rotational driving is connected to the shaft of the take-up roller 24, which causes the take-up roller 24 to rotate in the direction of the arrow F2, and the ink sheet 20 is fed to the supply roller 22. is adapted to rotate in the direction of arrow F3.

A thermal head 28 is provided between the supply roller 22 and the take-up roller 24 at a position facing the platen roll 12 with the ink sheet 20 sandwiched therebetween. The thermal head 28 is movable up and down. When this thermal head 28 is urged upward to apply a pressing force to the image-receiving paper set on the platen roll via the ink sheet and an appropriate drive signal is input, a large number of heat-generating elements are controlled to generate heat. Correspondingly, a portion of the ink on the ink sheet 20 is transferred onto the image receiving paper 10, and predetermined printing is performed.

The drive circuit 30.32 of said motor 18.26 is connected to a control circuit 34. Further, the signal processing circuit 36 that supplies head drive signals to the thermal head 28 is also connected to the control circuit 6.
Connected to 4.

Next, the operation of the above-mentioned conventional example will be described. First, the image receiving paper 10 is set on the platen roll 12, and the platen roll 12 is rotated to the print start position. This operation is performed by operating the drive circuit 60 in accordance with the control signal S1 of the control circuit 64 and rotating the motor 18. At this time, the thermal head 28 is moved downward and separated from the platen roll 12. After the platen roll 12 has stopped, the thermal head 28 moves upward L, and the ink sheet 20 is sandwiched and pressed between the f-printer head 28 and the image receiving paper 10 of the platen roll 12.

Next, a head drive signal VD corresponding to printing for a predetermined one digit, which is obtained by processing the video signal vS from the outside by the signal processing circuit 36, is input to the thermal head 28. For this reason,
The heating element included in the thermal head 28 generates heat in response to the head drive signal VD, and as a result, the ink applied to the ink sheet 20 is thermally transferred to the image receiving paper 10, and printing for one digit is performed. As in, when recording or printing of -digits is completed,
A control signal S1 is outputted to the drive circuit 30 by the control circuit 64, the motor 18 rotates, and the platen roll 12 rotates. The platen roll 12 moves the position of the next printing line on the image receiving paper 100 to the thermal head 2 according to the rotation of the motor 18.
Rotate to face 8. At this time, the ink sheet 20 is affected by friction due to being sandwiched between the platen roll 12 and the thermal head 28 and by the control circuit 3.
The drive circuit 32 based on the control signal S2 output from the
The winding torque generated by the motor 26 which is driven by the motor 26 acts accordingly. Therefore, the amount of movement of the ink sheet 20 is the same as the amount of movement of the image receiving paper 10 due to the rotation of the platen roll 12.
moves. That is, the same amount of ink sheets 20 as the amount of movement of the image-receiving paper 10 is taken up by the take-up roller 24, and the same amount of ink sheets 20 is supplied from the supply roller 22.

Through the above operations, when the feeding and positioning of the receiver paper 10 and the feeding of the ink sheet 20 for printing the next line are completed, the head drive signal V is sent to the thermal head 28 again.
D is input and the next line is printed. These operations are repeated until printing for one sheet of image receiving paper 10 is completed.

When printing for 1001 sheets of receiving paper is completed, the control circuit 64
The output of the control signal S2 is stopped, and the rotation of the motor 26 is stopped. Therefore, the winding of the ink sheet 20 by the winding roller 24 is also stopped.

Next, the image-receiving paper 10 on which printing has been completed and the next new image-receiving paper 1
0, the thermal head 28 moves downward away from the platen roll 12, and the motor 18 is driven by the drive circuit 30 to rotate.

In this case, since the ink sheet 20 was in close contact with the image receiving paper 10, static electricity often occurs on the surface of the image receiving paper 100 and the surface of the ink sheet 200 on which printing has been completed. This static electricity causes the ink sheet 20 to be attracted to the surface of the image receiving paper 10. And in the adsorption state -
1: As described above, when the platen roll 12 is rotated to replace the image receiving paper, the ink sheet 20 is transferred to the supply roller 22.
Alternatively, it is pulled out from the take-up υ roller and wound around the image receiving paper 10 on the platen roll. Therefore, there are problems in that it is difficult to replace the image receiving paper 10 and the ink sheet 20 is damaged.

[Purpose of the invention]

The present invention has been made in view of the above problems, and when the platen roll rotates when replacing the image receiving paper in a state where the pressing force of the thermal head against the platen roll has been released, the ink sheet is removed from the image receiving paper. It is an object of the present invention to provide a thermal transfer recording device which is prevented from being attracted to and caught in the heat-sensitive transfer recording device.

[Summary of the invention]

According to the present invention, the take-up roller is provided with a means for preventing the ink sheet from returning when the pressing force of the thermal head against the platen roll is released, and the supply roller is further provided with a means for preventing the ink sheet from being supplied. A means is provided to prevent ink from being drawn into the platen due to static electricity.

〔Example〕

Hereinafter, a thermal transfer recording apparatus according to the present invention will be explained in detail based on an embodiment shown in FIG. Components similar to those in the conventional example shown in FIGS. 2 and 6 will be denoted by the same reference numerals, and explanations thereof will be omitted, and only the different structures will be explained below.

At the axial end of the supply roller 22, a gear-shaped locking member 100 is arranged at the center of the shaft.

A solenoid device 102 is disposed near the locking member 100, and a plunger of the solenoid device 102 projects when energized and engages with a recess around the locking member 100. .

The control circuit 104 to which the drive circuits 30 and 32 of the motors 18 and 2 are connected is also connected to the drive circuit 106 of the solenoid device f102 described above.

Next, the overall operation of the above embodiment will be explained.

First, when printing is performed on the image-receiving paper 10, the image-receiving paper 10 is set on the platen roll 12, and the platen roll 12 is rotated to the printing start position, as described above. This operation is performed by rotation of the motor 18. After the platen roll 12 stops rotating, the thermal head 28 moves, and the ink sheet 20 is sandwiched and pressed between the image receiving paper 10 of the platen roll 12 and the thermal head 28.

Thereafter, when printing for one sheet of image receiving paper 10 is completed by the same operation as in the conventional example, before the platen roll 12 is separated from the ink sheet 20, the control circuit 106 sends a control signal S.
6 is output to the drive circuit 10 (5 is output to the solenoid device 10
2 is driven, and the plunger engages with the recess of the locking member 100. On the other hand, since the rotation of the motor 26 is not stopped,
A certain tension is applied to the shrink sheet 20 by the action of the take-up roller 24, which is about to rotate in the direction of arrow F2, and the supply roller 22, whose rotation in the direction of arrow F6 is stopped.

For this reason, when the thermal head 28 is moved downward to release the clamping pressure with the platen roll 12 after printing is completed, the ink sheet 20 is moved to the platen roll 12 by static electricity.
The image-receiving paper 100 set on the outer periphery of the image-receiving paper 100 is not adsorbed and wrapped around the surface.

The platen roll 12 released from the pressure by the thermal head 28 is rotated by the motor 18, and the holding member 16 is rotated by the motor 18.
When the holding member 16 is rotated to a position where it can be operated, the holding member 16 is released from the platen roll 12, and the image receiving paper 10 on which printing has been completed is removed.

In the above embodiment, when the pressure of the thermal head 28 on the platen roll 12 is released, the motor 26
is driven to apply rotational force to the take-up roller 24, but this has the disadvantage that the take-up roller 24 rotates in the opposite direction and the ink sheet 20 is pulled out from the take-up roller 24 side and wound around the platen roll 12. This is to prevent this from happening.

Therefore, it is not necessary to apply rotational force to the take-up roller 24. It is not necessary to do so; it is sufficient to prevent a reverse rotation furnace.

Therefore, for example, the motor 26 may be blunted by a brake means so as to apply a frictional force to the extent that the take-up roller 24 does not rotate in the reverse direction.

Further, in the embodiment, the thermal head is moved up and down to generate and release the pressing force against the platen, but it may be configured to control the movement of the platen up and down.

〔Effect of the invention〕

As explained above, according to the thermal transfer recording device according to the present invention, after printing is completed, the pressing force of the thermal head on the platen roll or the pressing force of the platen roll on the thermal head is released, and the printed image receiving paper is released. Platen roll I
When removing O, even if the platen roll is rotated, the ink sheet will not stick to the surface of the image receiving paper set around the platen roll and be rolled up, which prevents wastage or damage to the ink sheet and protects the equipment. This has the effect of allowing smooth operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a thermal transfer recording device according to the present invention, a part of which includes a circuit block, and FIG. 2 is a perspective view of an example of a conventional heat-sensitive recording device, a part of which includes a circuit block. , FIG. 6 is a partially omitted perspective view of the apparatus shown in FIG. 2. [Explanation of symbols of main parts] 10... Receiving paper, 12... Platen roll, 18° 26... Motor, 20... Ink sheet, 22...
- Supply roller, 24... Winding roller, 28... Thermal head, 30.32, 106... Pivoting circuit, 10
0... Engagement member, 102... Solenoid device, 10
4...Control circuit.

Claims (1)

[Scope of Claims] An ink sheet is sandwiched between a platen having an image-receiving paper set on its outer periphery and a thermal head, and the platen is rotated while a pressing force is generated, and the ink sheet is pre-wound around a supply roller. In a thermal transfer recording device configured to wind up an ink sheet with a take-up roller, when the pressing force from the platen and the thermal head is released, the supply roller acts so as not to feed the ink sheet. A thermal transfer recording device comprising: a prohibition means; and a reversal prohibition means that acts to prevent the take-up roller from reversing.