JPH0324368Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a thermal transfer recording device suitable for field-sequential color recording.

(B) Prior Art In general, in a thermal transfer recording device that performs recording by melting an ink layer on an ink sheet with a thermal head and transferring it to recording paper, particularly when using a roll recording paper as the recording paper, Appropriate back tension is required for the recording paper in order to prevent the recording paper from meandering and from sagging, which causes deterioration in recording quality.

In addition, in a thermal transfer recording device that performs color recording using an ink sheet having multiple color ink layers, for example, yellow, magenta, cyan, and black ink layers in this order, thermal transfer recording using one ink layer is completed. It is necessary to return the recording paper to the recording position each time.

Therefore, when performing color recording using a roll of recording paper, it is necessary to apply an appropriate back tension to the recording paper and to rewind the roll of recording paper after recording one color. .

Figure 3 shows “Technical Research Report of the Institute of Electronics and Communication Engineers,”
79-84 of EMC83-46, "Regarding thermal transfer color printers" is a schematic diagram showing a conventional example. The ink sheet 51 fed out from the ink sheet roll 50 passes through a guide roller 52 between the platen 53 and the thermal head 54, passes through a guide roller 55, and is wound onto a take-up roll 56. The ink sheet 51 has yellow, magenta, cyan, and black ink layers in this order.

On the other hand, the recording paper 58 fed out from the recording paper roll 57 passes through guide rollers 59 and 52 and passes between the platen 53 and the thermal head 54 while overlapping the ink sheet 51. Further, a rubber roller 60 is pressed against the outer periphery of the recording paper roll 57.

When the thermal head 54 is driven in accordance with the recording signal while feeding the ink sheet 51 and recording paper 58 by rotating the platen 53 counterclockwise, yellow transfer recording is performed on the recording paper 58. I can do it. After the recording is completed, the platen 53 is rotated clockwise and the rubber roller 60 is rotated counterclockwise to rewind the recording paper 58 to the initial position and perform magenta transfer recording. Furthermore, by performing cyan and black transfer recording in the same manner, multicolor recording can be performed.

(C) Problems to be solved by the invention By the way, in the above-mentioned configuration in which the recording paper is rewound by the rotation of the rubber roller that is pressed against the outer periphery of the recording paper roll, the pressing force of the rubber roller against the recording paper roll is weak. , the recording paper roll cannot be rotated, and therefore the recording paper cannot be rewound, and the recording paper becomes slack, making it difficult to apply appropriate back tension to the recording paper during subsequent transfer recording operations. Can not.

The present invention reliably rewinds the recording paper and applies appropriate back tension to the recording paper.

(d) Means for Solving the Problems The thermal transfer recording device of the present invention includes a conveyance roller that feeds the recording paper fed out from the recording paper roll, a drive motor that drives the conveyance roller in forward and reverse rotation, and a drive motor that drives the conveyance roller in forward and reverse rotation. a rotating plate that rotates at a faster speed than the conveyance roller when the motor reverses; a holder for holding the recording paper provided coaxially with the rotating plate;
a friction plate that is inserted between the rotary plate and the holder and transmits the rotational force of the rotary plate to the holder; and a braking means that applies braking force to the rotary plate when the drive motor rotates forward. It is characterized by:

(E) Function The present invention applies braking force to the normal rotation of the recording paper roll during recording operation, thereby constantly applying back tension to the recording paper being fed out from the recording paper roll, and also reducing the winding of the recording paper. When unwinding, a tension force is applied to the recording paper and the recording paper is rewound.

(F) Embodiment FIGS. 1 and 2 are a side sectional view and a partial front sectional view, respectively, showing an embodiment of the present invention. The ink sheet 2 pulled out from the ink sheet roll 1 has yellow, magenta, cyan, and black ink layers in sequence, passes through a guide roller 3, passes between a thermal head 4 and a platen 5, and is then further After passing through the gap between the feed roller 6 and the pressure roller 7, the sheet passes through a guide roller 8 and is wound onto a take-up roll 9. The thermal head 4 can be moved toward and away from the platen 5 by a solenoid (not shown).

The drive motor 10 is capable of forward and reverse rotation, and has a belt 13 stretched between a pulley 11 provided coaxially therewith and a pulley 12 interlocked with the platen 5.
The platen 5 is driven to rotate in forward and reverse directions, and the conveying roller 34 is driven to rotate in forward and reverse directions by a belt (not shown). Further, the drive motor 10 is rotated in the forward direction (counterclockwise direction) by a belt and clutch (not shown).
The feeding roller 6 is rotationally driven.

The rotating plate 15 formed integrally with the gear part 14 is
It is rotatably supported by a shaft 17 implanted in the side plate 16a of the recording device. Further, a drive gear 20 and a one-way clutch 21 are connected to both ends of the shaft 19, which is rotatably supported by a bearing 18 fixed to the side plate 16a.
The pulleys 22 are fixed to each other through the gear portion 14.
A transmission gear 23 is disposed between the drive gear 20 and the drive gear 20 . Note that the one-way clutch 21 transmits only the clockwise rotation of the pulley 22 to the shaft 19.

A belt 24 is stretched between the pulleys 11 and 12, and the clockwise rotation (reverse rotation) of the drive motor 10 is controlled by the belt 24, one-way clutch 21,
It is transmitted to the gear portion 14 via the shaft 19, drive gear 20, and transmission gear 23, and the rotary plate 15 is rotationally driven in the clockwise direction.

Here, when the drive motor 10 is driven in reverse, by adjusting the gear portion 14, the drive gear 20, etc.,
The rotation speed of the rotary plate 15 is set higher than that of the platen 5 and the conveyance roller 34.

Friction ring 2 made of rubber, felt, etc. on the end surface
The friction plate 26 provided with the friction ring 25 is rotatably supported on the shaft 17 in such a manner that the friction ring 25 is brought into contact with the rotary plate 15. The holder 27 is inserted into the shaft 17, and a long hole 27b provided in the base 27a is a pin 26b implanted in the base 26a of the friction plate 26.
by engaging with the friction plate 26,
Furthermore, it can move forward and backward in the direction of the shaft 17. Also,
A spring 28 disposed between the friction plate 26 and the holder 27 presses the friction plate 26 against the rotary plate 15 and urges the holder 27 to the right. on the other hand,
A holder 29 is fixed to the side plate 16b, and a recording paper roll 31 having a hollow axis 30 is sandwiched between the holders 27 and 29. Note that the shaft center 30 has a notch 30a at its end, and this notch 30a engages with the protrusion 27c of the holder 27. By moving the holder 27 backward to the left against the action of the spring 28, the recording paper roll can be easily loaded and unloaded.

The recording paper 32 fed out from the recording paper roll 31 held between the holders 27 and 29 is guided between the thermal head 4 and the platen 5 through the guide rollers 33 and 3, and is guided between the thermal head 4 and the platen 5. As the ink sheet rotates, the ink sheet moves together with the ink sheet 2, and is discharged through the contact between the conveyance roller 34 and the pressure roller 35.

The braking means 36 includes a lever 39 rotated clockwise by a spring 38 about a shaft 37, and a brake piece 40 made of rubber or the like fixed to the tip of the lever.
The brake piece 40 is in contact with the outer peripheral surface of the rotating plate 15. Since the contact position of the brake piece 40 is on the right side of the line connecting the center of the rotary plate 15 (i.e., the shaft 17) and the shaft 37, the brake piece 40 contacts the rotary plate 15.
When rotates counterclockwise, the brake piece 40 bites into the rotary plate 15 and applies a braking force to the rotation of the rotary plate 15.

In such a configuration, the ink sheet 2 and the recording paper 32 are placed at predetermined positions (FIG. 1),
When the drive motor 10 is driven in the forward rotation direction (counterclockwise), the platen 5 and the conveyance roller 34 are rotated, respectively, and the ink sheet 2 and the recording paper 32 are rotated.
is fed out from the ink sheet roll 1 and the recording paper roll 31. Note that the forward rotation driving force of the drive motor 10 is not transmitted to the shaft 19 by the one-way clutch 21, and the rotating plate 15 does not rotate clockwise. At this time, by selectively driving the elements of the thermal head 4 to generate heat in accordance with the signals, transfer recording can be performed using, for example, a yellow ink layer on the ink sheet 2.

This feeding operation of the recording paper 32 causes the holder 27 and the friction plate 26 that engages with the holder 27 to
rotates counterclockwise together with the recording paper roll 31. Further, although the friction plate 26 is intended to rotate the rotating plate 15 via the friction ring 25, the rotating plate 15
is prevented from rotating in the counterclockwise direction by a braking means 36 having a brake piece 40 that comes into contact with its outer peripheral surface. Therefore, the friction ring 25 of the friction plate 26
Sliding friction is generated between the holder 27 and the rotary plate 15, and this sliding friction applies a brake to the counterclockwise rotation of the holder 27, and applies an appropriate back tension to the recording paper 32 that is fed out from the recording paper roll 31. I will be joining.

Next, when the above-described transfer recording with the yellow ink layer is completed and transfer recording with the magenta ink layer is to be performed, it is necessary to rewind the recording paper 32.

First, the thermal head 4 is separated from the platen 5 by a solenoid (not shown). When the drive motor 10 is driven in the reverse direction (clockwise), the platen 5 is rotated clockwise, and the belt 24, pulley 22, one-way clutch 21,
The rotational driving force of the drive motor 10 is transmitted to the gear portion 14 via the shaft 19, the drive gear 20, and the transmission gear 23, and the rotary plate 15 is rotated clockwise. The rotational driving force of the rotary plate 15 is transmitted to the friction plate 26 and the holder 27 by the friction ring 25, and the recording paper roll 31 is rotated clockwise.

At this time, the rotational speed of the rotary plate 15 is set to be higher than that of the platen 5 and the conveyance roller 34. Therefore, the recording paper roll 31 rewinds the recording paper 32 in a stretched state, and the recording paper 32 is not sagged.

Note that the ink sheet 2 is not rewound because the feed roller 6 is prevented from rotating by a one-way clutch (not shown).

Thereafter, the thermal head 4 is brought into contact with the platen 5, and the magenta ink layer is transferred and recorded by the operations described above, and then the cyan and black ink layers are transferred and recorded in the same manner, thereby achieving multicolor transfer. Recording can be done.

(G) Effects of the invention According to the invention, during transfer recording, an appropriate back tension is applied to the recording paper, and when rewinding the recording paper, it is ensured that the recording paper is not rewound properly and sag. can be prevented, therefore,
It is possible to improve the recording quality and to stably convey the recording paper.

[Brief explanation of the drawing]

1 and 2 are a side sectional view and a main part front sectional view showing an embodiment of the present invention, and FIG. 3 is a schematic side view showing a conventional example. 1... Ink sheet roll, 5... Platen,
10... Drive motor, 15... Rotating plate, 25...
Friction ring, 26...Friction plate, 27...Holder, 31...Recording paper roll, 36...Braking means.

Claims (1)

[Scope of utility model registration request] A conveyance roller that feeds the recording paper unwound from the recording paper roll, a drive motor that drives the conveyance roller in forward and reverse rotation, a rotary plate that rotates at a faster speed than the conveyance roller when the drive motor reverses, and the rotation a holder for holding the recording paper provided coaxially with the plate; a friction plate disposed between the rotary plate and the holder to transmit the rotational force of the rotary plate to the holder; and the drive A thermal transfer recording device comprising: a braking means for applying a braking force to the rotary plate during forward rotation of the motor.