JPH01257076A - Thermal transfer recorder and thermal transfer recording method - Google Patents

Abstract

PURPOSE:To prevent a thermal transfer medium from being rubbed with a medium to be recorded by a method wherein tension is gently applied to the thermal transfer medium by driving a first drive source so as to make the thermal transfer medium be slightly loosened at an instance when tension is applied to the thermal transfer medium. CONSTITUTION:Though tension is applied to an ink sheet 10 between a platen roller 6 and a winding axis 16, the platen roller 6 is rotated by driving 8 motor for a slight time just before application of tension, and the ink sheet 10 is loosened. Therefore, when tension is applied to the ink sheet 10 by driving a motor 23, tension comes to be gently applied thereto. Then, since the ink sheet 10 does never slide on a recording sheet 4, no streak of ink adheres to the recording sheet 4. Further, even though the motor 23 is driven after the platen roller 6 has been stopped, the ink sheet 10 is never wound by an established torque value of a torque limiter.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a thermal transfer recording device and a thermal transfer recording method used as output devices such as printers, word processors, and facsimiles.

<Prior Art> In recent years, various devices have been developed and put into practical use as output devices such as facsimiles, and among them is a thermal transfer recording device. This uses an ink sheet with a base film coated with thermal transfer ink, the ink coated surface of the ink sheet is overlapped with the recording sheet, and heat is applied from the base film side of the ink sheet by the recording head in accordance with the image signal. However, it melts or lowers the viscosity of the ink and transfers it onto the recording sort, and is widely used today because it is small and lightweight and has excellent low noise properties.

In the thermal transfer recording device, a structure for conveying a recording sheet or an ink sheet is disclosed, for example, in Japanese Patent Application Laid-open No. 59-5
As disclosed in Japanese Patent No. 0762, a single motor may be configured to transport the recording sheet, take up and rewind the ink sheet, or a motor for transporting the recording sheet and a motor for winding the ink sheet may be used. A motor, a rewind motor, etc. were provided separately, and each motor was configured to drive the film.

Further, the drive source for driving the discharge roller is either shared with the drive source for conveying the recording sheet, or an independent drive source is provided.

<Problems to be Solved by the Invention> However, when the motor that winds up the ink sheet drives other cutters, ejection rollers, etc., there is a mode in which tension is applied only to the ink sheet, even though the recording sheet and the ink sheet are not conveyed. may occur. In this case, the moment tension is applied to the ink sheet, the ink sheet and the recording sheet rub against each other, resulting in image stains such as black streaks on the recorded image.

The present invention solves the above problems and provides a thermal transfer recording device and a thermal transfer recording method that can prevent image stains such as black streaks from occurring on a recording medium at the moment tension is applied to the thermal transfer medium.

Means for Solving the Problems> Means in the following embodiments for solving the problems described above include, in a thermal transfer recording apparatus, a conveying means for conveying the thermal transfer medium and the recording medium; a first drive source for driving the conveying means; a winding means for winding up the thermal transfer medium; a tensioning means for applying tension to the thermal transfer medium; and driving the winding and tensioning means. and a control means for slightly operating the first drive source in synchronization with the operation of the second drive source when only the second drive source is driven. It becomes a feature.

Further, in the thermal transfer recording method, the thermal transfer medium and the recording medium are transported by a first drive source, the thermal transfer medium is wound up by a second drive source, and only the second drive source is driven. In some cases, the first driving source is slightly driven so that the thermal transfer medium and the recording medium are slightly transported in the direction in which the thermal transfer medium is wound up.

<Operation> According to the above means, at the moment when tension is applied to the thermal transfer medium,
A first driving source drives the thermal transfer medium to loosen it slightly. Therefore, the tension is gently applied to the thermal transfer medium, thereby preventing the thermal transfer medium from rubbing against the recording medium.

<Embodiment> Next, an embodiment of a full-line thermal transfer recording apparatus to which the above-mentioned means is applied will be described with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view of the thermal transfer recording apparatus, and FIG. 2 is an explanatory view of the drive system. Further, FIG. 3 is a sectional view of Ei in FIG. 2, FIG. 4 is a sectional view of Rollo, FIG. 5 is a sectional view of Harbor, and FIG. 6 is a sectional view taken along line 2-2.

Note that FIG. 1 shows only the recording section, and does not show the input section for recording information.

In FIG. 1, A is the main body of the device. Reference numeral 1 designates a first casing that houses each component that will be described later, and numeral 2 designates a second casing that is rotatably supported on a shaft 3 provided in the first casing 1 and functions as a lid.

4 is a recording medium, and typically a plastic sheet or the like (hereinafter referred to as a "recording sheet") is used as a plain paper sheet. A recording sheet roll 4a obtained by winding the recording sheet 4 into a roll is stored in a holder 5. The leading edge of the recording sheet 4 pulled out from the recording sheet roll 4a passes through the upper part of the guide part 5a formed at the end of the holder 5, passes over the upper part of the platen roller 6, and is connected to the fixed blade 7a constituting the cutter 7. It passes between the movable blade 7b, is guided by a pair of upper and lower guides 8, is held between a pair of discharge rollers 9 constituted by a pair of rollers 9a and 9b, and is discharged to the outside of the apparatus main body. .

The cutter 7 includes a fixed blade 7a and a movable blade 7b driven by a drive system E, which will be described later, and is provided on the ejection path of the recording sheet 4. The movable blade 7b has a rotation center 7
Arrow e in FIG. 1 with point d in the center.

It is configured to cut the recording sheet 4 by rotating in the f direction and engaging with the fixed blade 7a.

10 is a thermal transfer medium, for example, a base film is a sheet-shaped resin film such as polyethylene terephthalate, and a thermal transfer ink that is melted or reduced in viscosity by heating is applied onto the base film (hereinafter referred to as "
(referred to as "ink sheet"). The ink sheet roll loa is placed on the ink sheet 10 with the ink surface facing outward.
The ink sheet roll 10a is formed above the holder 5, and is removably attached to an ink sheet 1-shaft 11 driven by a drive system C, which will be described later. The recording sheet 4 is pulled out as the recording progresses, and after recording is finished and the recording sheet 4 is cut by a cutter 7, it can be rewound by a predetermined amount.

The leading edge of the ink sheet IO pulled out from the ink sheet roll 10a is guided by the guide roller 12, and the ink surface is brought into contact with the recording sheet 4 at the platen roller 6 and overlapped, separated from the recording sheet 4 by the separation shaft 13, and then guided. It passes through a roller 14 and is wound up by a take-up roller 15.

The take-up roller 15 is detachably attached to a take-up shaft 16 driven by a drive system to be described later, and takes up the ink sort 10 in synchronization with the progress of recording, and when the recording is completed, the recording is completed. After the sheet 4 is cut by the canter 7, the ink sheet 10 can be rewound by a predetermined amount.

It is necessary to always apply a constant tension to the ink sheet 10 when winding or unwinding the ink sheet 10, and further transporting it as recording progresses. The reason for this is that since the ink sheet 10 is formed of an extremely thin film, if the ink sheet 10 is conveyed without applying tension, wrinkles will occur in the ink sheet 10, which will have an adverse effect on image formation.

Reference numeral 17 denotes a recording head, on the surface of which a plurality of heating elements that individually generate heat in response to image signals are arranged, and are provided along the platen roller 6 to face each other. Further, the recording hand 17 is fixed to a lever 18 by adhesive or the like, and the lever 18 is swingably supported on a shaft 19a of the bracket eye 9 via an elongated hole 18b provided in an end portion 18a. Furthermore, a compression spring 21 is provided between the back surface of the recording head 17 and the frame 20, and the recording head 17 is biased toward the platen roller 6 by this compression spring 21.

That is, the recording sheet 4 and the ink sheet 10 are interposed between the recording head 17 and the platen roller 6, and the ink sheet 10 is pressed against the recording sheet 4 by being biased by a compression spring 21. In this state, the heating element generates heat in an image pattern to melt or lower the viscosity of the thermal transfer ink at ink seam 0 and transfer it onto the recording sheet 4.

The platen roller 6 is driven by the stamping motor 22 via a power transmission member (not shown) such as a gear train, an endless belt, or an endless chino.
When the platen roller 6 rotates in directions a and b, the platen roller 6 rotates in the directions of arrows a and b in FIG. This is the direction of rotation during execution, and the rotation in the direction of arrow A refers to the direction of rotation when rewinding the recording sheet 4 and ink sheet 10. It rotates only when

As the platen roller 6 rotates, the recording sheet 4 and the ink sheet 10 are conveyed simultaneously.

In addition, the ink sheet shaft 11, the take-up shaft 16, and the discharge roller 9
a. Furthermore, the cutter 7 is configured to be driven by a stepping motor 23.

Next, each drive system C of the ink sheet shaft 11, take-up shaft 16, cutter 7, and discharge roller 9a by the motor 23,
D, E, and F will be explained with reference to FIGS. 2 to 6.

FIG. 2 is a transmission diagram of the drive system by the motor 23. In FIG. 2, C is the drive system of the ink sheet shaft 11, D is the drive system of the take-up shaft 16, and E is the drive system of the canter 7.
F is a drive system of the discharge roller 9a.

First, the drive system C of the ink sheet shaft 11 will be explained with reference to FIGS. 2 and 3.

An output gear 23b is fixed to a shaft 23a of a motor 23 fixed to a predetermined position of the frame 20. A gear 24a, which is a first-stage reduction gear, meshes with the output gear 23b. A gear 24b is formed integrally with the gear 24a, and a gear 25, which is a second stage reduction gear, meshes with the gear 24b. By meshing these output gear 23b and gears 24a, 24b, and 25, the remoter 2
This is to reduce the rotation speed of No. 3 and transmit it to each section described later. Also, the gears 24a, 24b and the gear 25 are connected to the frame 20.
It is rotatably supported on shafts 26 and 27 which are fixed by caulking or the like.

30 is a transmission gear that meshes with the gear 25, and is connected to the frame 2.
The transmission gear 30 is rotatably supported by a shaft 31 which is fixed to the transmission gear 30, and a one-way clutch 32 made of a spring flanch is attached to the boss 30a of the transmission gear 30.

A gear 33 is rotatably supported on the shaft 31.

The boss 33a of the gear 33 is the same as the boss 30 of the transmission gear 30.
The one-way clutch 32 is formed to have the same dimensions as a.
is provided across the boss 30a and the boss 33a, and is configured to transmit only the rotation of the transmission gear 30 in a specific direction (the direction indicated by the arrow in FIG. 2) to the gear 33.

A clutch gear 34 meshes with the gear 33, and is rotatably supported by a shaft portion 35a of a stepped shaft 35 fixed to the frame 20, and a boss 34a of the gear 34 has the same outer diameter as the stepped shaft 35. formed to the dimensions. Further, a one-way clutch 36 is provided on the outer diameter of the stepped shaft 35 so as to straddle the boss 34a.
The one-way clutch 36 functions as a brake to prevent rotation of the gear 34 in a specific direction (direction of arrow C in FIG. 2).

A gear 37 meshes with the gear 34. The gear 37 is integrally formed with a torque limiter 40 fixed to a shaft 39 rotatably supported by a bearing 38.

Further, a gear 41 is fixed to the shaft 39, and the gear 41 meshes with a gear 42 fixed to the ink sheet shaft 11. Here, the torque limiter 40 transmits a constant torque of the rotational force transmitted from the motor 23 to the shaft 39 regardless of its rotational speed, and this transmitted torque is determined according to the gear ratio between the gear 41 and the gear 42. The increased or decreased amount is transmitted to the ink sheet shaft 11, and the ink sheet l
This is used to unwind O.

The drive of the ink sheet shaft 11 configured as described above is as follows.
When the motor 23 rotates in the direction of the arrow a in the second rotation, this rotation is not transmitted from the gear 30 to the gear 33 due to the action of the one-way clutch 32, and therefore the ink sheet shaft 11 is not driven. Further, when the motor 23 rotates in the direction indicated by the arrow, this rotation is transmitted to the gear 33 by the action of the one-way clutch 32, and the rotation is transmitted to the gear 33 by the action of the one-way clutch 32. The torque is transmitted to a gear 42 via a torque limiter 40, and the ink sheet shaft 11 is rotated. At this time, a tension corresponding to the setting value of the torque limiter 40 is applied to the ink sheet 10.

That is, when the ink sheet 10 is conveyed by the rotation of the platen roller 6 in the direction of the arrow a in FIG. 1 as recording progresses, the ink sheet 10 is
is rolled out. At this time, a rotational force in the direction of arrow C is applied to the ink sheet shaft 11 by the platen roller 6 via the ink sheet O.

This rotation in the direction of arrow C is caused by gear 42. The torque is transmitted to the torque limiter 40 via the gear 41, and further transmitted to the clutch gear 34 via the gear 37. The rotation of the clutch gear 34 in the direction of arrow C is prevented by the braking action of the one-way clutch 36 fixed to the stepped shaft 35. Therefore, a torque corresponding to the setting value of the torque limiter 40 is applied to the ink sheet shaft 11, and the ink is Similarly, a tension corresponding to the setting value of the torque limiter 40 is applied to the ink sheet 10 between the sheet shaft 11 and the platen roller 6.

This tension prevents the ink sheet IO from wrinkles.

After the recording is finished, the recording sheet 4 is cut by the cutter 7, and then the recording sheet 4 is cut by the platen roller 6.
When the ink sheet 10 and the ink sheet 10 are returned to the initial position while being superimposed, the rotation in the direction of the arrow described above is transmitted to the ink sheet shaft 11, and this rotation allows the ink sheet 10 to be rewound while applying tension. I can do it.

Here, the set torque value of the torque limiter 40 is set to be smaller than the conveyance force with which the ink sheet O is conveyed by the platen roller 6 when performing image recording, and the ink sheet shaft 11 The rotation is set to be faster than the conveying speed when returning the recording sheet 4 and ink sheet 10 to their initial states after image recording is completed and the recording sheet 4 is cut by the cutter 7.

Since the drive system C of the ink sheet shaft 11 is configured as described above, when performing image recording, the ink sheet 10 is sequentially fed out from the ink sheet roll 10a by the conveying force of the platen roller 6, and at this time, torque is applied to the ink sheet 10. By applying a tension corresponding to the set value of the limiter 40, wrinkles are prevented from forming. Furthermore, when image recording is completed and the recording sheet 4 and ink sheet 10 are returned to their initial states, tension can be applied to the ink sheet 10 through the torque limiter 40 by the rotation of the motor 23 to perform rewinding. .

Next, the drive system of the winding shaft 16 will be explained with reference to FIGS. 2 and 4.

Gear 51 is connected to gear 25 which is the second stage reduction gear mentioned above.
are meshing. This gear 51 is rotatably supported on a shaft 52 fixed to the frame 20, and furthermore, the gear 51 is
A gear 71 for branching into the drive system of the cutter 7, which will be described later, is engaged via a one-way clutch 72.

53 is an intermediate gear that meshes with the gear 51, and the frame 2
It is rotatably supported on a shaft 54 which is fixed at zero.

Further, 55 is a gear that meshes with the gear 53, and the frame 2
It is rotatably supported on a shaft 56 which is fixed at zero.

A gear 57 is rotatably supported on the shaft 56 in the same manner as the gear 55, and a one-way clutch 58 is attached to the boss 55a of the gear 55 so as to straddle the boss 57a of the gear 57. One-way clutch 58 is configured to transmit rotation of gear 55 in a specific direction (direction of arrow a in FIG. 2) to gear 57.

A gear 59 is meshed with the gear 57. The gear 59 is rotatably supported on a shaft 60 fixed to the frame 20. A gear 64 is meshed with the gear 59 and is integrally formed with a torque limiter 63 fixed to a shaft 62 rotatably supported by a bearing 61. A gear 65 is fixed to the shaft 62, and a gear 66 fixed to the winding shaft 16 meshes with the gear 65.

In the above configuration, when the motor 23 rotates in the direction of arrow a, this rotation is transmitted from the gear 55 to the gear 57 via the one-way clutch 58, and the rotation of the gear 57 is transmitted to the winding shaft via the torque limiter 63. 16. At this time, a constant torque is transmitted from the torque limiter 63 to the shaft 62 regardless of the rotational speed of the gear 59, and the torque is increased or decreased according to the gear ratio of the gear 65 and the gear 66 and transmitted to the winding shaft 16. Ru. This transmitted torque applies tension to the ink sheet 10 between the platen roller 6 and the take-up shaft 16, and the ink sheets 1 and o are taken up on the take-up shaft 16 as recording progresses.

Further, when the motor 23 rotates in the direction indicated by the arrow, the rotation of the gear 55 is not transmitted to the gear 57 due to the action of the one-way clutch 58, and therefore the winding shaft 16 is not driven.

The set torque value of the torque limiter 63 is set to be smaller than the restraining force of the ink sheet 10 generated between the platen roller 6 and the recording head 17 when no recording is performed. Further, the winding speed of the ink seam O by the winding shaft 16 is configured to be higher than the transport speed at which the platen roller 6 transports the recording sheet 4 and the ink sheet 10 during image recording. .

Due to this speed difference, tension is applied to the ink sheet 10 between the platen roller 6 and the take-up shaft 16.

Since the drive system of the take-up shaft 16 is configured as described above, when recording starts, the motor 23 starts rotating in the direction of arrow a, and takes up the ink sheet 10 while applying tension according to the setting value of the torque limiter 63 to the ink sheet 10. It can be wound around the shaft 16. Furthermore, when the ink sheet 10 and the recording sheet 4 are returned to their initial positions by the platen roller 6 after recording, not much tension is applied to the ink sheet 10, but since the amount of return is small, this has an adverse effect on the formation of a recorded image. There is no effect on

Next, the drive system of the cutter 7 will be explained with reference to FIGS. 2 and 5.

A gear 71 is rotatably supported on the shaft 52.

Also, the boss 51a of the gear 51 has a boss 71 of the gear 71.
A one-way clutch 72 is installed across the gear 51, and the one-way clutch 72 transmits the rotation of the gear 51 in a specific direction (the direction indicated by the arrow in FIG. 2) to the gear 71. There is.

A gear 73 meshes with the gear 71, and is rotatably supported by a shaft portion 74a of a stepped shaft 74 fixed to the frame 20. The boss 73a of the gear 73 is configured to have the same diameter as the outer diameter of the stepped shaft 74, and a one-way clutch 75 is attached to the outer diameter of the stepped shaft 74 so as to straddle the boss 73a of the gear 73. ing. The one-way clutch 75 has a function as a brake against rotation of the gear 73 in a specific direction (direction of arrow d in FIG. 2).

A shaft portion 73b is integrally formed on the surface of the gear 73, and a link 76 is rotatably supported on the shaft portion 73b.

77 is a link formed in a substantially dogleg shape, and is connected to the frame 2.
It is rotatably supported approximately at the center of a shaft 78 which is fixed to the shaft 78 . The link 77 has an end 77a that is rotatably connected to the end 76a of the link 76 via a pin 79, and the other end 77b of the link 77 is connected to the end 76a of the link 76 so as to be rotatable through the pin 79. It is rotatably supported by a shaft 80 fixed to the side end 7c.

Here, the shaft 78 is provided on an extension of 7d, which is the rotation center of the movable blade 7b.

In the above configuration, when the motor 23 rotates in the direction of arrow a, the rotation of the gear 51 is not transmitted to the gear 71 due to the action of the one-way clutch 72, and therefore the cutter 7 is not driven. Further, when the motor 23 rotates in the direction indicated by the arrow, the rotation of the gear 51 is transmitted to the gear 71 by the action of the one-way cruncher 2, causing the gear 73 to rotate. The link 76 rotates as the gear 73 rotates, and the rotation of the link 76 is further transmitted to the link 77. The link 77 rotates in the directions of arrows e and f around a shaft 78, that is, the center of rotation of the movable blade 7b of the cutter 7, and converts this rotation into movement of the movable blade 7b via the shaft 80, so that the recording sheet is This is for cutting No. 4.

Since the drive system E of the cutter 7 is configured as described above, the recording sheet 4 can be cut by driving the movable blade 7b constituting the cutter 7 as the motor 23 rotates in the direction indicated by the arrow.

Next, the drive system F of the discharge roller pair 9 is shown in FIGS. 2 and 6.
This will be explained using figures.

The paper ejection roller pair 9 rotates by applying a driving force only to the ejection roller 9b side, and the ejection roller 9b is rotatably supported by a bearing 92 fixed to the main body of the apparatus. A stepped portion 9b+ is provided at the end of the discharge roller pair 9b, and the large diameter of the boss 90a of the gear 90 rotatably supported around the stepped portion 9b and the stepped portion 9b+ is are equally constructed.

A one-way clutch 91 is engaged across the large diameter portion of the boss 90a and the stepped portion 9b, and only when the gear 90 rotates in the direction of the arrow a in FIG. It is configured to transmit rotational force.

Since the gear 90 meshes with the gear 55 described above,
When the motor 23 rotates in the direction of arrow a of 212I, the discharge roller 9b also rotates in the direction of arrow a;
When the discharge roller 9b rotates in the direction indicated by the arrow in FIG. 2, the discharge roller 9b does not rotate.

Next, a control system for controlling the recording apparatus configured as described above will be explained using the block diagram shown in FIG.

In FIG. 7, 85 is a host device such as a word processor, which is used to manually input recording information such as image information or recording start information. Recorded information from the host device 85 is manually input to the control unit 87 via the interface 86 . The control unit 87 includes a CPU 87a such as a microprocessor, a ROM 87b storing control programs and various data for the CPU 87a, and a CPU 87a.
In addition to being used as a work area of The signals are transmitted to the motors 22 and 23 via drivers 88, respectively.

At the same time, a control signal corresponding to the image signal is sent from the control section 87 to the recording head 17 via the head driver 89, which causes the heating elements of the recording head 17 to selectively generate heat to form a recorded image on the recording sheet 4. is configured to do so.

FIG. 8 is a timing chart for driving the recording apparatus configured as described above, in which one cycle of recording is divided into six stages, and the operation of each operating section in each stage is shown.

FIG. 9 is a flowchart when recording is performed using the recording apparatus of this embodiment.

The case of recording using the recording apparatus of the embodiment described above will be explained with reference to FIGS. 8 and 9.

First, in the first stage "standby", the rotation of the motor 22 and the motor 23 is stopped.

In step S1, recording data such as image information and recording start information is transferred from the host device 85 to the control unit 87, and the process moves to step S2.

In steps S2 to S5, the motor 22 and the motor 23 simultaneously start rotating in the direction of arrow a in FIG. This rotation of the motor 22 causes the platen roller 6 to rotate in the direction of arrow a, thereby conveying the recording sheet 4 and the ink sheet 10. Further, the rotation of the motor 23 causes the discharge roller pair 92 and the take-up shaft 16 to rotate in the direction of arrow a, and while applying tension to the ink sheet 10 between the platen roller 6 and the take-up shaft 16, the ink sheet 10 is moved around the take-up shaft. Wind up to 16. At this time, tension according to the setting value of the torque limiter 40 is applied to the ink sheet 10 between the platen roller 6 and the ink sheet shaft 11 6 Furthermore, the recording head 17 generates heat in accordance with the image signal, and the ink sheet 10 The applied thermal transfer ink is melted or made to have a low viscosity and transferred onto the recording sheet 4 in an image pattern.

At this time, the operation of each operating section is as shown in the second stage in FIG.
This corresponds to "Record".

Next, in step S5, it is determined whether or not recording has ended, and if it has not ended, the process returns to step S4, and if it has ended, the process moves to step S6. In step S6, the recording sheet 4 is driven by the motor 22 and the motor 23.
The trailing edge of the image is conveyed to the canter 7. This action is the 8th
This corresponds to the third stage "recording sheet rear end conveyance" in the figure.

Next, step S7. In S8, the motor 23 is rotated in the direction indicated by the arrow in FIG. 2, and the movable blade 7b is operated by the drive system of the cutter 7 to cut the recording sheet 4.

This operation only applies to the fourth step of FIG. 8, ``cutting''.

During cutting, the rotation of the motor 23 in the direction indicated by the arrow also drives the drive system C of the ink sheet shaft 11, and this drive causes tension to be applied to the ink sheet 10 between the platen roller 6 and the ink sheet shaft 11. However, since the platen roller 6 is stopped, the torque limiter 40
The ink seam 0 will not be rewound due to the set torque value. However, if the ink sheet 10 slips between the recording paper 4 and the recording head 17 at the moment tension is applied to the ink sheet 10, the ink from the ink sheet IO rising on the recording sheet 4 may adhere as streaks within the spray mold 1. be. Therefore, in this embodiment, almost at the same time as the motor 23 rotates in the direction of the arrow in the figure, the control section 87 rotates the motor 22°2.
3 and the motor 22 is driven in the direction of the arrow within several hundred ns to several hundred μs, which is the time to issue commands in sequence (S7
). The drive time δ1 at this time is set so that the platen roller 6 rotates by an amount corresponding to the width of the streak within the several m1. As a result, the ink sheet 10 is slightly loosened at the moment when tension is applied to the ink sheet 10, and the tension applied to the ink sheet 1O becomes gentle, so that the ink streaks are not attached to the recording sheet 4.

Note that the driving time δ is intended to moderate the tension applied to the ink sheet 10, and does not need to be influenced by the width of the ink streaks as in this embodiment. Furthermore, since the drive time δ1 is a very short time, it does not matter which of the motors 22 and 23 is driven first.

Next, in step S9, the motor 22 is driven in the b direction,
As the motor 23 is driven, the cut ends of the ink sheet 10 and recording sheet 4 are rewound to the position of the recording head 17. At this time, the platen roller 6 and the ink sheet shaft 11
Tension is applied to the ink sheet 10 between the
The ink sheet IO is smoothly rewound without wrinkles or the like. This operation corresponds to the fifth step of "rewinding the recording sheet" in FIG.

Note that even when the recording sheet 4 is being rewound (when the motor 23 is rotating in the direction of the arrow in FIG. There is no problem in starting rewinding after cutting the sheet 4.

Moreover, the movement of the movable blade 7b applies tension when rewinding the ink sheet 10. Therefore, while the cutting edge of the recording sheet 4 is rewound from the cutting position by the cutter 7 to the recording position by the recording head 17, the motor 22
．． It is preferable to control the drive of 23.

Next, in step SIO, it is determined whether the leading edge of the recording sheet 4 has been rewound to the position of the recording head 17, and if it has been rewound, the motor 22 is slightly driven in the direction a in step Sll and then stopped. Then, in step S12, the motor 23 is driven in the direction of arrow a in FIG. End (S1
3. 514).

In step S12, the drive system of the take-up shaft 16 is also driven, and tension is applied to the ink sheet 10 between the platen roller 6 and the take-up shaft 16, but immediately before the tension is applied, The motor 22 is driven slightly (time δ2) to slightly rotate the platen roller 6 in the direction of arrow a in FIG. If tension is applied, it will be applied gently. Therefore, step S7. As with S8, ink sheet 1
Since the zero does not slip on the recording sheet 4, ink streaks will not adhere to the recording sheet 4.

Furthermore, after the platen roller 6 has stopped, the motor 23
Even if the ink seam O is being driven, the ink seam O will not be wound up due to the set torque value of the torque limiter 63.

The steps 311 to S13 correspond to the 6th step "recording sheet discharge" in FIG.

During the operation, in steps 37 and 311, the motor 22
The driving time δ1. δ2 may be set within several tens of ms.

Here, it is determined whether or not the trailing edge of the image on the recording sheet 4 has been conveyed from the position of the recording head 17 to the position of the canter 7, or whether it has been rewound.
This is done by counting the number of steps.

By applying gentle tension to the ink sheet 10 as described above, it is possible to prevent the ink from the ink sheet 10 from staining the recording sheet 4.

In the above embodiment, the drive system C1 of the ink sheet shaft 11, the drive system E of the take-up shaft 16, and the drive system E of the cutter 7 are
The transmission system does not need to be limited to gears, and it is also possible to use an endless heald or cheno transmission system.

Furthermore, in place of the spring clutch used as the one-way clutch in the above-described embodiments, it is also possible to use, for example, a needle-type one-way clutch or an electromagnetic clutch.

Furthermore, in the above-mentioned embodiment, there is a holder 5 for storing the recording sheet 4. The first casing is provided with a sheet roller 6, a force roller 7, a guide 8, and a discharge roller 9a, and an ink sheet shaft 11. Recording head 171 Take-up shaft] 6 and discharge roller 9
It is also possible to configure so that b is provided in the second housing.

<Effects of the Invention> As described above, in the present invention, the thermal transfer medium is slightly loosened at the moment when tension is applied to the thermal transfer medium.
Tension is gently applied to the thermal transfer medium. Therefore, even if the thermal transfer medium stretches slightly at the moment when tension is applied to the thermal transfer medium, the recording medium will still be moving until it is fully extended, and there is no chance of the thermal transfer medium rubbing against the recording medium. This can prevent the recording medium from being stained by the ink or the like of the thermal transfer medium.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a thermal transfer recording device according to this embodiment,
Fig. 2 is an explanatory diagram of the drive system by the motor 23, Fig. 3 is a sectional view of Ei in Fig. 2, Fig. 4 is a sectional view of Rollo, Fig. 5 is a sectional view of the harbor, and Fig. 6 is a 2-2 sectional view. , FIG. 7 is a block diagram of the control system, FIG. 8 is a timing chart of the operating section, and FIG. 9 is a flowchart 1. A is the apparatus main body, l is the first housing, 2 is the second housing, 4 is the recording sheet, 4a is the recording sheet roll, 5 is the holder, 6 is the platen roller, 7 is the cutter, 7a is the fixed blade, 7b is the Moving blade, 7d is rotation center, 8 is a guide, 9 is a pair of discharge rollers, IO is an ink sheet, 11 is an ink sheet shaft, 12
．． 14 is a guide roller, 13 is a separation shaft, 15 is a take-up roller, 16 is a take-up shaft, 17 is a recording head, 18 is a lever, 20 is a frame, 21 is a compression spring, 22.23 is a motor, and 23a is an output gear , 32, 36.58.72
．． 75.91 is a spring clutch, 40.63 is a torque limiter, 76 and 77 are links, 78 is a ten dl, 85 is a host device, 86 is an interface, 87 is a control unit, 8
7a is a CPU, 87b is a ROM, and 87c is a RAM. 88 is a motor driver, and 89 is a driver.

Claims (2)

[Claims] (1) In a thermal transfer recording device that transports a thermal transfer medium and a recording medium and transfers ink from the thermal transfer medium to the recording medium by selectively applying heat, for transporting the thermal transfer medium and the recording medium. a first driving source for driving the conveying means; a winding means for winding up the thermal transfer medium; a tension means for applying tension to the thermal transfer medium; the winding means; a second drive source for driving the tension means; and a control means for slightly operating the first drive source in synchronization with the operation of the second drive source when only the second drive source is driven. A thermal transfer recording device characterized by having the following. (2) In a thermal transfer recording method in which a thermal transfer medium and a recording medium are conveyed and the thermal transfer medium is selectively heated to transfer ink from the thermal transfer medium to the recording medium, the thermal transfer medium and the recording medium are The thermal transfer medium is transported by a first drive source, and the thermal transfer medium is wound by a second drive source, and when only the second drive source is driven, the thermal transfer medium is moved in a direction in which the thermal transfer medium is wound up by the drive. and a thermal transfer recording method, characterized in that the first drive source is slightly driven so as to slightly transport the recording medium.