JPH02245354A - Thermally transferable recording device - Google Patents

Abstract

PURPOSE:To perform full-page recording without color shift and blank space on recording paper by providing a transport roller upstream a platen roller and a discharge roller downstream, and also providing a peel-apart roller which peels an ink sheet off the recording paper on both sides of the platen roller. CONSTITUTION:Transport rollers 24, 25 and discharge rollers 27, 28 for transport recording paper 7 are provided upstream and downstream a platen roller 9. Consequently, data can be recorded in an extremely small degree of color shift. In addition, rollers for peeling ink sheet 6 off the recording paper 7 are provided on both sides of the platen roller 9, and the platen roller 9 is driven only when the recording paper 7 is transported downward. Consequently it is possible to peel the back off and thereby perform full-page recording. The positions for pressing of the platen roller 9 and the thermal head 8 are fixed by providing a U groove 21 and a head positioning shaft 50 which are a mechanism for determining the relative positions of a transport block 2 with a platen roller 9 and a head block 3 with a thermal head 8. Thus data can be recorded with an extremely small degree of color shift.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording paper transport mechanism in a thermal transfer color recording device.

[Conventional technology]

In a conventional thermal transfer color recording device, an ink sheet and a recording paper are overlapped and sandwiched between a thermal head (thermal head) and a platen roller, and the thermal head is heated to generate heat while the thermal bed is pressed. This recording apparatus had a mechanism for conveying the recording paper and the ink sheet, respectively, using a pair of dedicated rollers for transporting the recording paper and a pair of dedicated rollers for transporting the ink sheet, and the same portion of the recording paper was transported back and forth multiple times.

This rice cultivation apparatus is described in Japanese Patent Application Laid-Open No. 60-38181, % Publication No. 119070-1982, and the like.

In addition, in conventional devices, since recording is performed by holding the recording paper between a pair of dedicated rollers that transport it, it is not possible to record on the recording paper a length that corresponds to the transport distance between the pair of dedicated rollers and the platen roller. start.

Alternatively, there is a problem that the print has a white margin near the end, and the recording area (or recording rate) for a given recording paper is small.

[Problem U that the invention attempts to solve]

The above-mentioned conventional technology does not give sufficient consideration to local slips between the rollers and the recording paper that occur within the recording paper transport mechanism, sagging of the recording paper, thermal deformation of the recording paper that occurs during recording, etc. may appear singly or by interfering with each other, resulting in partial color misregistration on the recording paper.

An object of the present invention is to provide a thermal transfer recording device that does not cause color shift. Another object of the present invention is to provide a thermal transfer recording device that performs full-surface recording without creating any blank areas on recording paper.

[Means to solve the problem]

In order to achieve the above objective regarding color misregistration, a conveyance roller is provided upstream of the platen roller.

The recording paper is conveyed while being pinched by a discharge roller provided downstream of the platen roller. The ejection roller is driven via a torque limiter with a one-way rotation drive mechanism and a friction transmission mechanism, and during recording, it rotates as a driven device, and when returning, it is driven at a speed greater than the conveyance speed of the recording paper given by the conveyance roller to remove the recording paper. It has a mechanism that returns the

In addition, in order to achieve full-surface recording, peeling rollers are installed on both sides of the platen roller to peel off the ink sheet from the recording paper. This is what I did.

[Effect]

During recording, the recording paper is held between transport rollers and transported, and the ejection roller and platen roller are driven to rotate by the frictional force with the recording paper, so the ejection roller and platen roller apply a transport resistance force to the recording paper. . Since recording is performed with a tension equal to this transport resistance acting on the recording paper, the recording paper passes through the pressure area between the thermal head and the platen roller, which is the part that thermally transfers the ink on the ink sheet to the recording paper, causing it to sag. In addition, the recording paper is not locally deformed, and color shift does not occur.

In addition, in full-page printing in which recording is performed from end to end in the conveyance direction of the recording paper, when one end of the recording paper is recorded, the recording paper is separated from the ejection roller, and recording is performed in a state where no tension is applied to the recording paper. Since the length of the recording paper to be recorded in this state from the nipping part of the recording paper to the leading edge of the recording paper is short (about 20 W), the apparent bending rigidity of the recording paper itself in this part is relatively large.

Even if the recording paper is not held between the ejection rollers, local deformation of the recording paper is unlikely to occur. When recording paper is being held between discharge rollers and conveyed by conveyance rollers for recording, the ink sheet is peeled off by a peeling roller on the conveyance roller side. Peeling off the ink sheet from the portion of the recording paper recorded with zero tension is performed using a peeling roller provided on the discharge roller side while returning the recording paper.

Since the length recorded with zero tension is short, color shift due to slack k does not occur due to the rigidity of the recording paper itself. By operating in this manner, it is possible to obtain a full-surface color print without any one-color shift.

[Examples] Examples of the present invention will be described below. Figures 1 to 4
The figure shows the structure of a thermal transfer color recording device which is an embodiment of the present invention. FIG. 1 is a side view of the device. Figure 2 shows
In FIG. 1, the head block 3 is shown in a lifted state. 3 and 4 are schematic diagrams showing a portion of the drive mechanism of the device.

This device consists of two side plates 31°3 fixed perpendicularly to the bottom plate 30.
1', and a paper feed block 1 and a transport block 2 are fixed to the bottom plate 30 with bolts. Also, a head block 3, a cutter block 4. The main motor 10 and cooling fan 11 are attached to the side plates 31 and 51'. Ink block 5 is a cassette.

Ink receivers 79, 79 attached to side plates 31, 31'
', 80.

It is attached to 80'. Furthermore, the recording paper roll 12 that supplies the recording paper 7 has the same mechanism as the ink block 5, and has paper feed roller receivers 32 and 62 attached to the side plates 31 and 31'.
’ is installed.

The recording paper 7 fed out from the recording paper roll 12 is fed to the paper feed block 1. It is sent out from this device via a conveyance block 2 and a cutter block 4. The paper feed block 1 includes two front paper feed rollers 15cL and 15b and two rear paper feed rollers 16α and 16b.
It consists of a pair of rollers and paper guides 17α and 17A. The front paper feed roller 15b and the rear paper feed roller 16b move in the vertical direction as the paper feed frame 14 moves in the left and right direction. The paper feeding frame 14 moves in the left-right direction as the paper feeding frame 14 rotates around the pin 33 while being guided by the groove 19 provided in the cam 18.

The conveyance block 2 is composed of paper guides 22, 23, a conveyance roller pair of a conveyance roller 24 and a pressure roller 25, a platen roller 9, and a discharge roller pair of a discharge roller 27 and a suppression roller 28, etc., and each roller, guide, etc. are rotatably or bolted to the roller chassis 29, 29'. The conveying row 224 is a rigid cylinder made of stainless steel or the like, and granular ceramic material is randomly adhered to the surface thereof to increase the coefficient of friction with the recording paper 7. The suppression roller 25 is a rigid hollow cylinder 25α whose surface is covered with an elastic body 25h such as rubber. A rolling bearing 25c is inserted into the hollow cylinder, and the rolling bearing 25c is supported by a shirt) 25(!). This shaft 25ct is rotatably attached to the roller chassis 29, 29'.A suppression lever 55 is attached to both ends of the shaft 25d.The pressure lever 35 is attached to a groove 21 (not shown) provided in the cam 18. The platen roller 9 and the discharge roller 27 have stainless steel cores and rubber surfaces. The pressure roller 28 is a cylindrical roller covered with an elastic material such as Sheracon.The leaf spring 26 attached to the paper guide 23 constantly presses the pressure roller 28 against the discharge roller 27. An optical sensor 36 is attached to the paper guide 22 to detect the presence or absence of the recording paper 7. An ink sensor 37 is attached to the paper guide 23 to detect the position of the ink cartridge. It is.

The cutter block 4 consists of a rotating blade 39, a fixed blade 40, and an optical sensor 38 that detects the presence or absence of recording paper 7, and a side plate 51.
, 31'. Rotating blade 39 and fixed blade 40
This is a mechanism in which a one-rotation blade 39 rotates and cuts the recording paper 7 fed in between.

The head block 3 has a thermal head 8 at the left end of the head arm 41, and a shaft 42 that is the center of rotation when lifting the hekudo block 3 is provided at the right end. KIt is installed so that it can rotate. Further, a coil spring 43 is provided at the right end of the head arm 41 to hold the lifted head block 3. The head block 5 can be lifted as shown in FIG.

The head arm 41 can be rotated to a vertical position (A is about 90 degrees). The thermal head 8 is rotatably supported by a rotating shaft 46 at the center position in the width direction (perpendicular to the plane of the paper). The head mounting plate 47 is rotatably attached to the hekudo arm 41. Cooling fins 4B are attached to the upper part of the thermal hekuto 8, and the cooling fins 48 and the thermal head 8 move together.Cooling fan 11 The thermal head 8 is cooled by the air passing through between the cooling fins 48 .

A front peeling roller 55 and a rear peeling roller 56 are rotatably attached to the lower part of the thermal head 8. A head pressing force for pressing the thermal head 8 against the platen roller 9 is provided by a coiled spring 44 . The spring 44 is attached to the top surface of the thermal head 8 and the head top plate 5 fixed to the hector arm 41.
1 and is guided by a shaft 49 and installed. A pin 45 provided in the middle of the hector arm 41 is guided by the groove 20 and moves in the vertical direction as the cam 18 rotates. This movement of the pin 45 moves the head arm 41 and the head top plate 51 in the vertical direction, expands and contracts the spring 44, and applies or releases the head pressing force.

Thermal hect 8 and platen roller 9 are the ink sheet 6
The part that presses the paper 7 through the platen roller 9
This is the apex part of. The deformation of the apex of the platen roller 9 is as follows:
It can be approximated by an elastic contact model between a cylinder and a plane, in which the thermal head 8 presses against the cylindrical platen roller 9.

In order to obtain high-quality prints, the contact length between the cylinder and the plane (
It is necessary to position the heat generating part of the thermal hect 80 at the center of the width of 200 mm. In this device, the suppressed position of the platen roller 9 and the thermal head 8 is determined by inserting the head positioning shaft 50 attached to the head arm 41 into the U groove 21 provided at the upper end of the roller chassis 29 with shaft fitting precision. A mechanism is provided to keep it constant.

As shown in FIG.
, and the ink sheet 6 that moves from the feed roll 53 to the take-up roll 54.

The ink sheet 6 stretched between the feed roll 55 and the take-up roll 540 is held down by a thermal head 8, as shown in FIG. (However, the ink case 52 is omitted in FIG. 1.) The ink sheet 6, which has also come out from the feed roll 53, passes through a guide shaft 57 rotatably attached to the roller chassis 29, 29'.

The recording paper is pressed along the platen roller 5 by the front peeling roller 55 and rear peeling roller 56 located on both sides of the platen roller 9 and the thermal head 8, and is wound onto the winding roll 54.

Next, the drive structure of this device will be explained.

FIG. 3 is a top view of the apparatus, and is a schematic diagram showing a portion of the power transmission mechanism such as each roller, and the rollers and the like that are not driven via power transmission means such as belts and gears are omitted.

The output of the main motor 10 attached to the side plate 31 is transmitted to the conveyance roller 24, the platen roller 9, the ejection roller 27, the front paper feed roller 15α, and the rear paper feed roller 16α via a power transmission means.
, and is transmitted to the recording paper roll 12.

The main motor 10 is, for example, a pulse motor. The main motor 10 rotates the conveyance roller 24 with a belt 58.

A gear 61 fixed to the conveyance roller 24 meshes with a gear 62 attached via an idler gear 68 and a one-way clutch 71 that has the function of transmitting power to the platen roller 9 in one direction only, thereby controlling the rotation of the main motor 10. It is transmitted to the platen roller 9.

Another gear 63 fixed to the conveyance roller 24 meshes with the gear 64 via an idler gear 69. This gear 64 is attached to the discharge roller 27 via a one-way clutch 72 and a torque limiter 74 consisting of a friction transmission mechanism. The main motor 10 rotates the discharge roller 27 with a torque that is less than or equal to the torque set by the torque limiter 74 . Further, the gear 61 meshes with a gear 65 attached to the rear paper feed roller 16α via an idler gear 70, and the rear paper feed roller 16a and the front paper feed roller 15α are connected by a belt 60. The rear paper feed roller 16α
and is transmitted to the front paper feed roller 15α. A pulley 76 is connected to the upper end of the conveyance roller 24 via a one-way clutch 73.
is installed. This pulley 76 is connected to the recording paper roll 12.
A belt 59, a pulley 77,
The torque IJ is connected to the gear 67 attached to the recording paper roll 12 via the Mitsutaf 5 and gear 66. The recording paper roll 12 is rotationally driven by the main motor 10 with a torque less than the set torque of the torque limiter 75 . However, the rotational power of the main motor 10 drives the recording paper roll 12 as follows.
This occurs only when the recording paper roll 12 is driven counterclockwise by the action of the one-way clutch 73.

Figure 4 shows cutter block 4. 3 is a schematic diagram showing a drive mechanism for an ink block 5 and a cam 18. FIG.

The cutter block 40 rotary blade 39 is driven by a motor 78 with a reduction gear
Rotationally driven.

The ink block 5 is shown with the ink case 52 omitted. When the feed roll 55 is attached to the ink receivers 79 and 79' provided on the side plates 31 and 31', a gear 90 attached to the feed roll 53 meshes with a gear 89 attached via a torque limiter 87. The torque limiter 87 is connected to the feed motor 81 via the reduction gear 8'4.

The power of the feeding motor 81 is transmitted to the feeding roll 53 at a torque equal to or less than the set torque of the torque limiter 87 .

Further, the drive mechanism for the take-up roll 54 has the same configuration as the drive mechanism for the delivery roll 53 described above. The power of the winding motor 82 (1, the torque below the set torque of the torque limiter 88 is transmitted to the winding roll via gears 91 and 92.

Cams 1 and 18' mounted on both sides of the camshaft 95
is rotationally driven by a mode motor 83 via a reduction gear 86. Mode motor 83. The feed motor 81° and the take-up motor 82 are, for example, DC motors.

Next, the operation of this device will be explained. In FIG. 1, when the platen roller 9 is used as a reference, the paper feed block 1 side (to the right in the figure) is called the upstream side, and the cutter block side (to the left in the figure) is called the downstream side.

The recording paper 7 is in the form of a roll, and the ink sheet 6 is hung on the feed roller 56 and the take-up roller 54, and is mounted on the apparatus as shown in FIG. 2. The vertical movement of the paper feed roller 16b, the generation of the pressing force that causes the pressure roller 25 to press the transport roller 24, and the generation of the head pressing force that causes the thermal head 8 to press the platen roller 9 are all performed at the rotational position of the cam 18. controlled. The state of each roller etc. created at the 1st position of the cam shown in FIG. 2 will be referred to as the "0 mode". In "O mode", the front paper feed rollers 15α and 15h are separated.

The rear feeding rollers 16α and 16b are in contact with each other, and the conveying roller pair 24
and 25 are separated, and the state in which the thermal head 8 and platen roller 9 are separated is 105 degrees (11 automatic paper feeding operation). Attach the recording paper roll 12 so that it is positioned at (as shown in FIG. 2). Lower the head block 3 and place the bottle 45 into the groove 2o of the cam 18. When recording starts, the cam 18 rotates. Only the front paper feed roller 15A is moved downward, and the front paper feed rollers 15g and 1
The recording paper 4 is held between the grips 5b. This state is "Paper feeding mode"
It is. Next, the main motor 10 rotates and the front paper feed roller 15α conveys the recording paper 7 in the downstream direction. The leading edge 7α of the recording paper enters the rear paper feed rows 216α and 16h and is held therebetween. The recording paper 7 is fed by a front paper feed roller 15α and a rear paper feed roller 1.
6a and enters the transport block 2. Optical sensor 3
6 detects the recording paper 7, the main motor 10 is stopped. A predetermined number of pulses N is applied to the main motor 10.
input to the control circuit. As the main motor 10 rotates, the recording paper 7 passes between the pair of transport rollers 24 and 25, and stops at the position where the leading edge 7α of the recording paper passes through the pair of transport rollers 24 and 25. The cam 18 rotates, presses the pressure roller 25 against the conveyance roller 24, and pinches the recording paper 7. Then, the front paper feed roller 15A and the rear paper feed roller 16b are moved upward. This state is called "transport mode."

The main motor 10 is driven again, and the leading edge 7α of the recording paper advances downstream by a transport length corresponding to the number of pulses N, and stops at a position past the apex of the platen row 29.

The cam 1B rotates, and the state changes from the conveyance mode to a state in which the thermal hect 8 is lightly pressed against the platen row 29.

Due to the rotation of the main motor 10, the recording paper 7 is transferred to the conveyance roller 24.
The recording paper is conveyed by the platen roller 9 and stopped at a position where the leading edge 7α of the recording paper is sandwiched between a pair of discharge rollers 27 and 28. Next, the cam 18 rotates to return to the transport mode, and the recording paper 7 is transported downstream by the transport roller 24 and the discharge roller 227. Conveyance is stopped when the optical sensor 38 detects the leading edge 7α of the recording paper.

This completes the automatic paper feeding operation.

The automatic paper feeding in this apparatus is characterized in that the platen row 29 is driven in a transport machine that has a transport roller 24 and a discharge roller 27 that apply transport force to the recording paper 7 on the upstream and downstream sides of the platen row 29. Platen roller 9
Automatic paper feeding becomes possible by assisting the conveyance of the recording paper 7 by the .

(2) Normal paper feeding operation The automatic paper feeding described above, when using a new recording paper roll 12, or when using a recording paper roll 12 that is currently in use due to maintenance, etc.
- This is an operation performed when there is no recording paper 7 on the conveyance path, such as when using the recording paper roll 12 in the middle of use again after it has been removed from the apparatus. In many cases, the recording paper 7 is considered to be attached to the conveyance path. The operation differs depending on whether there is recording paper 7 on the conveyance path or not. Furthermore, when the recording paper 7 is on the conveyance path, the operation differs depending on whether the leading edge 7a of the recording paper is upstream or downstream of the optical sensor 68. In order to judge these, this device uses the sequence shown in FIG.

When the optical sensor 36 detects that there is no recording paper 7, the automatic paper feeding described above is performed. On the other hand, the optical sensor 56 detects that the recording paper 7
If it is detected that there is, the transport mode is set and the output of the optical sensor 38 is determined. The optical sensor 38 is connected to the recording paper 7
If it is detected that there is no recording paper 7, the conveyance roller 24
is sent downstream, and stops when the optical sensor 38 detects the leading edge 7a of the recording paper.

On the other hand, when the optical sensor 38 detects that the recording paper 7 is present, the recording paper 7 is conveyed upstream until the leading edge 7a of the recording paper passes the optical sensor 38, and then conveyed downstream, so that the recording paper 7 is exposed to light. It stops when the sensor 38 detects the leading edge 7α of the recording paper.

(3) Recording operation As shown in the flowchart of FIG. 5, the recording paper 7 is conveyed downstream, the optical sensor 38 detects the leading edge 7a of the recording paper, and the recording operation starts from the point at which the conveyance stops. Ru.

While in the transport mode, feed a predetermined amount of recording paper 70 (for example,
In the case of A4 size recording, the paper is conveyed downstream by the length of the A4 size in the longitudinal direction - the length between the apex of the platen roller 9 and the leading edge 7α of the recording paper, and then stopped.

In parallel with this conveyance of the recording paper 7, the positioning of the ink sheet 6 is performed. At this time, a conveyance force is applied to the recording paper 7 by the conveyance roller 24, the platen roller 9, and the discharge roller 27, and the conveyance roller pair 24.25 and the discharge roller pair 27.28
The recording paper 7 in between is conveyed in a barrel. Next, the cam 18 rotates to enter the "recording mode". The recording mode is a state in which the thermal head 8 is pressed downward in the transport mode, as shown in FIG. In recording mode, thermal hect 8 prints ink sheet 6 and recording paper 7.
The head pressing force that presses the platen roller 9 via the head is approximately 10 N/rn.

By energizing the thermal head 8 while conveying the recording paper 7 to the upstream side, the first color ink (for example, yellow) on the ink sheet is transferred onto the recording paper 7. At this time, a conveyance force is applied to the recording paper 7 by the conveyance 24. The discharge roller pair 27 and 28 and the platen roller 9 are rotated by the frictional force with the recording paper 7 by the one-way clutches 71 and 720 function. In particular, the discharge roller 27 is subjected to a load equal to the torque set by the torque limiter 74 and pulled in the opposite direction to the conveyance direction of the recording paper 7, so that the recording paper 7 can be conveyed without slacking near the platen roller 9. .

The recording paper 7 sent back to the upstream side from the pair of transport rollers 24 and 25 is wound around the recording paper roll 12 so as not to sag on the transport path of the paper feed block 1 or the like.

In FIG. 1, a constant torque 7"J acts on the feed roll 55 in the counterclockwise direction, pulling the ink sheet 6 toward the upper left. Also, a constant torque rt acts on the take-up roll 54 in the counterclockwise direction. (However, rt) TJI)
acts to apply tension to the ink sheet 6 in the upper right direction. At the portion where the thermal head 8 presses against the platen row 29, the frictional force between the recording paper 7 and the ink sheet 6 is greater than the frictional force between the ink sheet 6 and the thermal head 8. Therefore, the ink sheet 6 and the thermal head 8 slip. The ink sheet 6 is conveyed to the upstream side at the same speed as the recording paper 7, is sent out from the feed roll 53 by the length of the conveyance, and is wound up on the take-up roll 54. in this way,
Since the ink sheet 6 is constantly being conveyed under tension, sagging and wrinkles are prevented from occurring.

The transferred portion of the ink sheet 6 and recording paper 7 are moved from the top of the platen roller 9 to the front peeling roller 5 in a stuck state.
It is transported up to 5. At the front peeling roller 55 portion, a conveying force acts on the recording paper 7 in the lower right direction, and a tension force acts on the ink sheet 6 in the direction of the take-up roll 54, which becomes a peeling force that peels off the ink sheet 6 (forward peeling). . The forward peeling is performed while conveying the recording paper 7 to the upstream side.

When the leading edge 7a of the recording paper is on the downstream side of the pair of discharge rollers 27 and 28, the restraining force pressed by the pair of discharge rollers 27° and 28 and the rotational resistance force of the discharge roller 27 caused by the torque limiter 74 move toward the downstream direction. To work on recording paper 7, recording paper 7
is recorded under tension. Leading edge 7a of recording paper
When the recording paper 7 passes the discharge roller pair 27 and 28, the recording paper 7 downstream from the apex of the platen roller 9 is conveyed without being restrained until the leading edge 7a of the recording paper reaches the apex of the platen roller 9, and then stops.

At this time, the ink sheet 6 is not peeled off from the recording paper 7 from the leading edge 7a of the recording paper to the front peeling roller 55.

In this part, the main motor 10 is reversed, and the recording paper 7 is conveyed downstream by the conveyance roller 24 and the platen roller 9 while being peeled off by the rear peeling roller 56 (back peeling).

The leading edge 7α of the recording paper is held between the pair of discharge rollers 27 and 28, and the recording paper 7 is stopped. In the case of back peeling, the tension of the ink sheet 6 pulled in the direction of the feed roll 56 becomes the peeling force. The portion of the recording paper 7 where the back is to be peeled opposes the peeling force using its own bending rigidity. If the bending rigidity of the recording paper 7 is too small, the ink sheet 6 cannot be peeled off from the recording paper 7, and a conveyance problem occurs in which the recording paper 7 is carried toward the feed roll 53 together with the ink sheet 6. . Further, when the bending rigidity of the recording paper 7 is sufficiently high, if the peeling force is too small, the recording paper 7 cannot be peeled off, causing a problem that the ink sheet 6 is drawn into the paper guide 26. Therefore, in this device, the feeding roller 5
By adjusting the setting torque of the torque limiter 84 connected to 3, the optimum setting torque was experimentally determined.

Next, the cam 18 is rotated to set the thermal head 80 to a transport mode in which the head pressing force is released. The main motor 10 is reversed, and the recording paper 7 is conveyed downstream by a predetermined length.
Stop. This completes the recording of the first color. Continuing, the second color (for example i ink) and the third color (cyan)
are recorded in the same sequence as the first color. When the recording of the third color is completed, the recording paper 7 is conveyed downstream by a length corresponding to the conveyance length from the apex of the platen roller 9 to the cutting position of the cutter block 4, and then stopped. The cutter motor 78 is driven to cut the recording paper 7. By the above-described recording operation, a color print printed from end to end of a predetermined recording paper size (for example, in the case of 14-size paper, L=297 cod, r=z1ow in FIG. 6) 101 (FIG. 6) )
is obtained.

(4) Partial recording operation The partial recording operation in which recording is performed while the recording paper 7 is always held between the pair of transport rollers 27 and 28 is the recording operation described in section (3), and the transport length of the recording paper 7 is This becomes possible by changing the , and removing the back peeling operation. In this case, the resulting color print 102 will have a top or bottom margin. The width j of this margin corresponds to the conveyance length from the platen roller 9 to the discharge row 227,
This is a portion where recording cannot be performed because the recording paper 7 is always held between the pair of ejection rollers 27 and 28. Considering the position of the image printed on the 7th side of the recording paper, there is a margin at the top and bottom! It is also possible to obtain a color print 103 provided with.

Further, it is also conceivable that the color print 101 recorded on the entire surface can be obtained by a partial recording operation. This is a color print 104 obtained by partially recording the length of the specified paper size (for example, 297 cm in the case of 14 size) and cutting both ends of the recording paper 70.

When a color print 104 of the entire surface is obtained using this method,
Paper waste is generated only in the margin (length l) at the leading edge of the recording paper 7. Considering the effectiveness of the recording paper 7, the full-page recording described in item (3) is superior.

According to this embodiment, a pair of transport rollers 24 and 25 . which are rollers for transporting the recording paper 7 to the upstream and downstream sides of the platen roller 9 . By providing the pair of discharge rollers 27 and 28, it is possible to record extremely small color misregistrations of several tens of microns or less, resulting in the effect that high quality color prints can be obtained. In addition, rollers 54 and 56 for peeling the ink sheet 6 from the recording paper 7 are provided on both sides of the platen roller 9, and the platen roller 9 is driven only when the recording paper 7 is conveyed downstream. This has the effect of making peeling possible and making it possible to record on the entire surface. Furthermore, by providing a U groove 21 and a head positioning shaft 50, which are mechanisms for defining the relative positions of the conveying block 2 having the platen roller 9 and the head block 3 having the thermal head 8, the platen roller 9 and Since the suppression position of the thermal head 8 is constant, recording with extremely small color shift is possible.

In addition, this device has each mechanical component as a paper feed block 1, a conveyance block 2, a head block 3, and so on. Assemble into blocks like the kofta block 4, and attach each block to the bottom plate 3.
0. Since the structure is attached to the side plates 31 and 31', the assembly work is shortened and the assembly is easy.

Next, another example will be described.

In FIG. 1, the discharge roller 27 is made of a rigid cylindrical surface made of stainless steel or the like with granular ceramic material adhered randomly, and the suppression row 228 is made of a stainless steel material as a core and a surface made of an elastic material such as rubber. This is a thermal transfer color recording apparatus having a conveyance block 2 made of the same structure as the one shown in FIG. By providing the conveyance roller 24 and the ejection roller 27, each having a surface made of one granular material, on the upstream and downstream sides of the platen roller 9, as in the present apparatus, the binding force on the recording paper is increased. Due to this increase in restraining force, the rotation of the main motor 10 is reduced by the conveyance roller 2.
4 and the discharge roller 27, and the positioning accuracy of the recording paper 7 corresponds to the color misregistration by 1:1 VC, making it possible to record with an extremely small amount of color misregistration.

A sixth embodiment in which the discharge roller 27 is driven by a single motor will be described.

In another thermal transfer color recording apparatus shown in FIGS. 1, 2, and 4, a portion of the drive mechanism is shown in FIG.

Parts with the same numbers in Figure 7 and Figure 3 have the same structure as above.
They have the same functionality. The difference between FIG. 7 and FIG. 5 is that a discharge motor 94 and a gear reduction gear 95 are provided. The discharge motor 94 is, for example, a DC motor. The discharge roller 27 is driven by a discharge motor 94 via a gear reduction gear 95. The operation of this device is roughly the same as that of the first embodiment described above, and the difference is in regard to the drive of the ejection motor 94. In the operation of the first embodiment, when conveying the recording paper 7 to the downstream side, the discharge motor 94 is driven to rotate the discharge roller 27 counterclockwise (FIG. 1). When conveying the recording paper 7 to the upstream side (mainly during recording), the ejection motor 94
do not drive. By operating in this way, during recording, the recording paper 7 is transported upstream by the transport force transmitted from the transport roller 24 to the recording paper 7, and at the same time, the ejection roller, which rotates as a result of the frictional force with the recording paper 7, 27 is a gear reducer 9
5 and the discharge motor 94. The gear reducer 95 and the discharge motor 94 act as an inertial load on the discharge roller 27.

Therefore, the force exerted on the recording paper 7 by the discharge roller pair 27 and 28 in the direction opposite to the conveying direction is greater than that in the first embodiment by the force due to the torque lost in the rotation of the inertial load. The fact that this force in the opposite direction is large means that when a larger tension is applied, the transport roller pair 24 and 25 is transferred to the ejection roller pair 27 and 28.
Since a larger tension than in the first embodiment is applied to the recording paper 7 up to this point, local out-of-plane deformation of the recording paper 70 is corrected and recording is performed. Thereby, local color shift on the recording paper 70 can be prevented.

Next, in the operation of recording the entire surface, without peeling off the back,
A fourth embodiment in which the ink sheet 6 is peeled off only by forward peeling will be described.

The structure of the device is the same as the first embodiment (FIGS. 1 and 2), but the operation is partially different. The parts that operate differently are described below. In the recording operation described in item (3) above, the first color of the ink sheet 6 is recorded on the recording paper 7 while the recording paper 7 is conveyed to the upstream side, and when the leading edge 7α of the recording paper reaches the top of the platen roller 9. Recording is stopped at , and the recording paper 7 and ink sheet 6 are further conveyed to the upstream side. When the leading edge 7a of the recording paper reaches the upstream side of the front peeling roller 55 (FIG. 8), the conveyance is stopped. The recorded part is now rotated by the cam 18,
The thermal head 8 enters the half mode in which it is lightly pressed. The main motor 10 is reversed to transport the recording paper 7 downstream. The leading edge 7α of the recording paper is ejected o-ra pair 27 and 2
8, and then stopped.

By performing the conveyance during recording in the above-described sequence, the ink sheet 6 can be peeled off from the recording paper 7 by only forward peeling, making it possible to record on the entire surface without performing pack peeling, which has strict peeling conditions.

According to this embodiment, it is possible to prevent the recording paper 7 from being drawn into a direction other than the conveyance path, which is likely to occur when the ink sheet 6 is peeled back.
Jamming of the ink sheet 6 due to insufficient peeling force can be prevented.

〔Effect of the invention〕

The present invention produces the effects described below.

By sandwiching and conveying the recording paper between two pairs of conveying rollers, color recording can be performed with extremely small color misregistration of several tens of microns. Furthermore, by providing peeling rollers for peeling off the ink sheet from the recording paper on both sides of the suppression section between the thermal head and the platen roller, it is possible to record even when the recording paper is separated from the pair of recording paper conveyance rollers in the negative set. . By making this recording possible, it becomes possible to print across the entire surface of the recording paper from end to end. Furthermore, by attaching a highly hard granular material to the surface of the drive α-2 of the pair of conveyance rollers, it is possible to ensure conveyance force without slipping between the recording paper and the drive roller, and to perform recording with less color shift. At this time, the important recording surface of the recording paper comes into contact with the driven roller, so it is not affected by particulate matter (scratches, etc.). Furthermore, regarding the hardness of particulate matter, the thermal head resistor Ml
By setting the hardness slightly lower than the film hardness, it is effective to prevent damage to the film and to withstand wear caused by recording paper.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional side views showing one embodiment of the present invention, Figure 3 is a schematic diagram of the top view of Figure 1, and Figure 4 is a partial diagram of the top view of Figure 1. 5 is a flowchart showing a part of the operation of the present invention, FIG. 6 is a diagram showing the recording range of the present invention, and FIG. 7 is a schematic diagram of a top view showing another embodiment of the present invention. . FIG. 8 is a partial sectional view showing another embodiment of the present invention. 1... Paper feed block 2...
......Transportation block 3...
Head 7" Otsuku 4......Cutter block Ink flock Ink sheet Recording paper To thermal platen roller Conveyance roller Ejection roller Roller Chassis Optical sensor Head arm Feeding roller Winding roller Front peeling roller Back peeling Laura's condolence map

Claims (1)

[Scope of Claims] 1. A pair of conveying rollers consisting of a drive roller and a driven roller for nipping and conveying a recording paper wound into a roll, a drive mechanism that rotates the pair of conveying rollers in forward and reverse directions, and a platen. In a thermal transfer recording device having a thermal head that presses a recording paper and an ink sheet against a roller, two pairs of conveyance rollers are arranged on both sides of the platen roller to sandwich and convey the recording paper, and these conveyance rollers are arranged on both sides of the platen roller. A mechanism for forwarding and reversing the pair of rollers, a cutting mechanism for cutting the rolled recording paper into a predetermined length after recording, and peeling rollers on both sides of the platen roller for peeling the ink sheet from the recording paper. Features of thermal transfer recording device. 2. Thermal transfer recording according to claim 1, characterized in that the driven roller of the pair of transport rollers is placed on the recording surface side of the recording paper, and the drive roller is placed on the back side of the recording paper to sandwich the recording paper to convey the recording paper. Device. 3. The thermal transfer recording device according to claim 1 or 2, wherein at least one surface of the drive roller is formed by adhering a particulate material such as alumina fine powder material by adhesive or the like. 4. The thermal transfer recording device according to claim 3, wherein the hardness of the granular material is lower than the hardness of the heating element protective film of the thermal head.