JPS61116570A - Thermal transfer recorder - Google Patents

Abstract

PURPOSE:To reduce the number of motors, by a construction wherein an ink sheet payout roll and an ink sheet take-up roll are connected to a single motor through respective one-way clutches, and the rolls are selectively rotated in accordance with the rotating direction of the motor. CONSTITUTION:The one-way clutch 16 connected with the payout roll 1 does not transmit the drive force of the motor 15 when the motor 15 is rotated in the direction of an arrow (b), but it transmit the drive force when the motor 15 is rotated in the opposite direction (-b). Similarly, the one-way clutch 17 connected with the take-up roll 9 trnasmits the drive force of the motor 15 to the roll 9 only when the motor 15 is rotated in the direction of the arrow (b).

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a thermal transfer recorder used in facsimiles, printers, etc. 1! This invention relates to a device 2 in which an ink sheet supply roll and an ink sheet take-up roll in an apparatus can be driven by one motor.

<Prior Art> Conventionally, this type of thermal transfer recording device conveys an ink sheet 2 and a recording material 4 by a platen roller 7 driven by a motor 11, and also generates heat by a heating element 5, as shown in FIGS. 3 and 4. A predetermined recorded image is thermally transferred onto the recording material 4, and after the transfer, the recording material 4 is canted from the trailing edge of the recorded image by a cutter 10, and the cut end of the recording material 4 is rewound to the vicinity of the heating element 5. Furthermore, at this time, the ink sheet 2 is also conveyed and rewound together with the recording material 4 by the supply roll 1.
The winding roll 9 and the winding roll 9 can be driven by motors 12 and 13 at appropriate times.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional device, motors must be provided for driving the supply roll and for driving the take-up roll, and a large number of motors are required, as well as a control circuit for controlling the motors. In addition, a large power source for driving the motor is required, which results in an increase in the size of the device as a whole and increases the cost.

The present invention relates to a completely new thermal transfer recording && device developed to solve the above-mentioned conventional problems.

<Means for Solving the Problems> Next, one means of the apparatus according to the present invention for solving the above problems will be described.

FIG. 1 is a schematic explanatory diagram of an apparatus according to the present invention, in which an ink sheet 2 wound around a supply roll L&:S and a recording material (paper, plastic sheet, etc.) 4 wound around a recording material roll 3 are shown. The thermal head 6 is configured to closely pass between a platen roller 7 and a thermal head 6 having a heating element 5 that can generate heat according to the recorded image information.At this time, the ink is The ink on the sheet 2 is peeled and welded onto the recording material 4, and the recorded image is thermally transferred. After thermal transfer, the ink sheet 2 and recording material 4 are separated by a separation roller 8, one of the separated ink sheets 2 is taken up by a take-up roll 9, and the other recording material 4 is taken up by a cutter 10 at the trailing edge of the recorded image. It is cut from the paper and discharged from a predetermined part. Furthermore, after cutting, record material 4
The recording material 4 and the ink sheet 2 are rewound so that the cut ends of the recording material 4 and the ink sheet 2 are near the heating element 5, and the next thermal transfer standby state is established.

In driving the above device, the driving force to the platen roller 7 is transmitted by the motor 14 through a reduction system, and the driving force to the supply roll 1 and the take-up roll 9 is transmitted by a motor that can be driven together with the driving of the motor 14. 15 through one-way clutches 16 and 17, and further through a reduction system and a slip clutch that slips when a load greater than the window is applied.

Here, a one-way clutch 16 connected to the supply roll l
When the motor 15 rotates in the direction indicated by the arrow, the driving force of the motor 15 is not transmitted to the supply roll 1, and the drive force is rotated in the -b direction (
The one-way clutch 17 connected to the take-up roll 9 is connected to the motor 15.
This is a unidirectional craft that transmits the driving force to the take-up roll 9 when it rotates in the b direction, but not when it rotates in the -x direction.

Note that if the winding speed of the ink sheet 2 is slow relative to the recording material 4, the ink sheet 2 will sag and wrinkles will occur.
In order to avoid the inconvenience of poor transfer, the ink sheet 2 needs to be operated so as to be wound up at the same speed as the recording material 4 is supplied and rewound. However, the speed at which the supply roll l and the take-up roll 9 wind up the ink sheet 2 is as follows.
If the rotation of the motor 15 is constant, the roll diameter changes depending on the amount of the ink sheet 2 to be wound, and the winding speed also changes. Therefore, in order to prevent the sheet from sagging due to the speed change, the supply roll is ! And the ink sheet winding speed of the winding roll 9 is adjusted to the platen roller 7.
The rotation speed of the motor 15 is set so that it is always faster than the conveyance speed of the ink sheet 2 and recording material 4, and the rotation speed faster than the conveyance speed of the platen roller is absorbed by sliding with the spec latch. This is to prevent the ink sheet 2 from sagging by applying tensile strength to the ink sheet 2 due to sliding.

Operation> Next, the operation of the apparatus configured as described above will be explained with reference to the timing chart of FIG.

When recording is started, the motor 14 rotates in the direction of arrow a, and the ink sheet 2 and recording material 4 are transported forward, and a predetermined image is recorded on the recording material 4 by the heating element 5 of the thermal head 6. At the same time, the motor 15 also rotates in the direction of the arrow C, and its driving force is transmitted to the take-up roll 9 via the one-way clutch 17, and as the roll 9 rotates in the direction of the arrow C, the ink sheet 2 is taken up. It will be done. At this time, since the winding speed transmitted to the winding roll 9 is faster than the conveying speed of the ink sheet 2 by the platen roller 7, slippage occurs due to the slip clutch, and front tension is applied to the ink sheet 2 due to the slippage. In addition, when the motor 15 rotates in the direction indicated by the arrow, the supply roll 1 does not rotate because the driving force is cut off by the one-way clutch 16, and when the ink sheet 2 is supplied in this state, it slips into the spec latch. Since this occurs, the ink sheet 2 is applied with a bank tensile run.

Therefore, there is no slack in the entire ink sheet 2.

Next, when recording for one sheet is completed, the recording material 4 is conveyed in the same manner as described above until the trailing edge of the recorded image passes the cut position of the cutter 10, and the ink sheet 2 is also wound up on the winding roll 9 at the same speed. .

After the recording material 4 is cut from the rear edge of the recorded image, the motor 1
4 reversely rotates in the -a direction, and the recording material 4 and ink sheet 2 are folded back so that the cut end of the recording material 4 comes near the position of the heating element 5. This is the position where the recording material 4 was cut. Since nothing is recorded in the area from the cutting tip to the heating element 5, the purpose is to eliminate the gold-white portion at the tip when recording next time.

At the same time as the motor 14 reversely rotates in the -a direction, the motor 15 also reversely rotates in the -b direction, and the driving force to the take-up roll 9 is interrupted by the one-way clutch 17, contrary to when it rotates in the above-mentioned direction. The recording material 4 is transmitted to the supply roll 1 via the one-way clutch 16 and the ink sheet 2 is also rewound as the roll 1 rotates in the direction of arrow d.
It is wound up at the same speed. At this time, in the same way as when the motor 15 rotates in the direction b, the bank tension and front tension run are applied to the ink sheet 2 by the slipping of the respective slip clutches, so that the ink sheet 2 is prevented from sagging.

<Effects of the Invention> As described above, the present invention connects a supply roll and a take-up roll of an ink sheet to one motor via a one-way clutch, and rotates the supply roll and take-up roll according to the rotational direction of the motor. Because it is configured to provide driving force, the number of motors can be reduced compared to conventional equipment, and the number of motor control circuits can also be reduced accordingly, making the entire equipment smaller and reducing costs. It has the characteristics that it can also be used for various purposes.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the device according to the present invention, FIG. 2 is a timing chart showing the operation of the device accompanying motor drive,
FIGS. 3 and 4 are explanatory diagrams of a prior art device and its timing chart. 1 is a supply roll, 2 is an ink sheet, 3 is a recording material roll, 4 is a recording material, 5 is a heating element, 6 is a thermal head, 7 is a platen roller, 8 is a separation roller, 9 is a winding roll, 10 is a cutter , 11-15 are motors, 16.17
is a one-way clutch.

Claims (1)

[Claims] In this device, a recording material and an ink sheet attached to a supply roll are transported by a platen roller, and the ink on the ink sheet is thermally transferred to the recording material based on predetermined information, and the ink sheet after the transfer is wound up with a take-up roll. There,
The supply roll and the take-up roll are each connected to one motor via a one-way clutch, and the driving force is transmitted to one of the supply roll and the take-up roll depending on the rotational direction of the motor. A thermal transfer recording device featuring: