JP2583843C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device used as a hard copy such as a computer. 2. Related Art Configuration and Problems In recent years, along with the colorization of computer display devices, the colorization of printers as output devices has also reached the stage of practical use. Especially, in the field of computer art using graphic display devices, high-quality, high-quality color images are required, and printers for video and magnetic cameras are required to have an image quality comparable to that of silver halide photography. It can be said that it is. However, it becomes more difficult to obtain a high quality color image as the recording density increases. Hereinafter, a conventional recording apparatus will be described. FIG. 1 shows a basic configuration of a conventional color recording apparatus, in which 1 is a recording paper, 2 is a pulse motor, and 3 and 4 are feed rollers for narrowly transporting the recording paper 1 at a predetermined pressure. Reference numeral 5 denotes a platen roller driven by the pulse motor 2, and 6 denotes a thermal head having heating elements arranged linearly in the width direction of the recording paper 1. It is arranged so as to be pressed against or difficult. Reference numeral 7 denotes a platen pressing roller which is pressed against the platen roller 5 with a small pressure via the recording paper 1; and 8, as shown in FIG. M) and cyan (C) are ink sheets that are separately applied on the base film in this order. 9 is an ink sheet take-up roll driven by the pulse motor 2, 10 is an ink sheet supply roll, and 11 is a recording paper supply roll. The operation of the conventional recording apparatus configured as described above will be described below. Until the recording paper 1 is mounted, the thermal head 6 is difficult to connect with the plantain roller 5, and the feed roller 3 and the platen roller 5 move the recording paper 1 together with the feed roller 4 and the platen pressing roller 7. It is rotating to transport in the direction a. When the leading end of the recording paper 1 taken out from the recording paper supply roll 11 and conveyed by the feed rollers 3 and 4 passes through the pressure contact portion between the platen roller 5 and the platen pressing roller 7, the feed rollers 3, 4 and the platen roller 5 and the platen presser The roller 7 stops rotating and the recording paper 1
Also stops at the same time. The thermal head 6 is pressed against the platen roller 5 via the recording paper 1 and the ink sheet 8 in a state in which only the feed rollers 3 and 4 are rotated in a reverse direction for a predetermined time while slipping with the recording paper 1 to remove the slack of the recording paper 1. Let it. At this time, the ink sheet 8 first supplies the start position of the surface on which the yellow ink layer (Y) is applied to a position facing the thermal head 6. Next, a recording signal is sent to the thermal head 6, and only the necessary heating elements generate heat to melt the yellow ink of the ink sheet 8 and selectively transfer it onto the recording paper 1. On the other hand, the pulse motor 2 intermittently drives the platen roller 5 and the ink sheet take-up roll 9 in the directions b and c, respectively, so that the recording paper 1 and the ink sheet 8 are each time the thermal head 6 completes recording for one line. Is transported for a distance of. At this time, the feed rollers 3 and 4 rotate accompanying the recording paper 1 while giving an appropriate back tension to the recording paper 1. When the printing with the yellow ink of the printing area determined as described above is completed, the thermal head 6 is separated from the platen roller 5 and the ink sheet 8 is separated from the recording surface of the recording paper 1. And pulse motor 2
When the platen roller 5 is rotated in the d direction by the same number of steps as during recording, the recording paper 1 is conveyed by the frictional force of the pressure contact portion between the platen pressing roller 7 and the platen roller 5, and is returned to the home position. At this time, the feed rollers 3 and 4 are tensioned in the direction e so that the recording paper 1 is not bent. At the end of recording, the ink sheet 8 provides the end position of the yellow ink area to the position of the thermal head 6. However, during the reverse operation, the ink sheet take-up roller 9 is driven by a one-way clutch or the like. Is released from the driving force, the ink sheet winding roll 9 is rotated by another driving means (not shown), and the ink sheet 8 is wound up by a predetermined length.
The start position of the magenta ink area (M) is matched with the position of the thermal head 8. The same operation as described above is repeated for the magenta ink on the recording paper 1 that has returned to the home position in this way, and only the recording paper 1 is returned again, and finally the recording is performed with cyan ink (C), and the color recording for the determined area is performed. To end. However, in such a conventional recording apparatus, the recording paper 1 is fed by the platen roller 5 and the platen pressing roller 7 while receiving a load due to the pressing force of the thermal head 6 during the recording operation. The sheet is fed backward by the platen roller 5 and the platen pressing roller 7 without receiving the pressing force of the head 6. That is, the transport condition of the recording paper 1 due to the pressure contact of the thermal head 6 is different between the recording operation and the reverse return operation, and this causes a difference in the transport length of the recording paper 1. Cannot return to its original position exactly. There has been a problem that the amount of the shift becomes a color shift in the color recording, which causes a decrease in print quality. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. By correcting the initial position of the recording paper every time one color is recorded, the alignment of the initial position of the recording paper can be performed with higher accuracy than the conventional one. It is an object of the present invention to provide a recording apparatus which realizes high quality color recording with less color shift. According to the present invention, the recording paper is recorded in the same place a plurality of times while the recording paper is reciprocally conveyed.
In the recording apparatus, a printing means, a platen roller which presses the printing means via the recording paper, and which is disposed on the recording paper sending side of the printing means, is nipped and fixed so that the leading end of the recording paper does not slip, and is the same at the start of recording. And a back tension applying means for applying back tension to the recording paper arranged on the recording paper feeding side of the printing means.
Before the printing means presses against the platen roller before the start, the back tension applying means,
The recording paper is tensioned between the holding part by the chuck and the back tension applying means.
The recording paper is wound around the drum by the rotation of the drum during the recording operation, and the next recording is performed, so that the chuck provided on the drum does not slip the leading end of the recording paper. This is a recording apparatus in which the recording paper is returned to the original position by the reverse rotation of the drum before starting. Description of Embodiment FIG. 3 shows a basic configuration diagram of a recording apparatus according to a first embodiment of the present invention. In FIG. 3, 12 is a recording paper, 13 is a pulse motor, and 14 and 15 are rollers which are sandwiched between the recording paper 12 at a predetermined pressure. Back tension applying means for applying tension. 16 is a pulse motor 13 during recording operation
The platen roller 17 driven by the recording paper 17 is a thermal head having heating elements arranged linearly in the width direction of the recording paper 13 so as to be in pressure contact with or separated from the platen roller 16 at a predetermined pressure via the recording paper 12. Are located. 17A is a thermal head separated from the platen roller 16, and 18 is yellow (Y), magenta (M), and cyan (C) in the order of a predetermined recording area of the heat-meltable ink as shown in FIG. These are ink sheets separately applied on a base film. Reference numeral 19 denotes an ink sheet take-up roll driven by the pulse motor 13, reference numeral 20 denotes an ink sheet supply roll, reference numeral 21 denotes a recording paper supply roll, and reference numeral 22 denotes a chuck disposed near the recording paper sending side of the thermal head 17. In the open state, the recording paper 12 is configured to pass through between the upper and lower claws of the chuck. Reference numeral 23 denotes a chuck unit having a built-in chuck 22, chuck driving means and recording paper detecting means (none is shown), reference numeral 24 denotes a fixed shaft on which the chuck unit 23 is rotatably mounted, and reference numeral 23A denotes a rotated chuck unit. Reference numeral 22A indicates the chuck after the chuck unit has been rotated. The operation of the recording apparatus of the present embodiment configured as described above will be described below. At first, the thermal head 17 is in the state of 17A, and the ink sheet 18 is pulled up with back tension so as not to be loosened, and is brought into contact with the thermal head 17A.
There is a gap between 6 and the thermal head 17A. The feed rollers 14 and 15 rotate to convey the recording paper 12 in the f direction. Then, the leading end of the recording paper 12 taken out from the recording paper supply roll 21 passes through the pressing portion of the feed rollers 14 and 15 and the gap between the platen 16 and the thermal head 17A in this order, and the claw of the chuck 22 which is in the open state is opened. Upon reaching the position, the detector in the chuck unit 23 detects the recording paper 12 and sends a signal to the chuck driving means to put the chuck in a sandwiching state, and sends a signal to the rollers 14 and 15 to stop it. When the leading end of the recording paper 12 is nipped in this way, the feed rollers 14 and 15 rotate reversely for a certain period of time, and function as back tension applying means for applying a back tension to the recording paper 12 in the g direction.
The conveying force of the feed rollers 14 and 15 at this time is large enough to remove the slack of the recording paper 12 and the deviation in the paper width direction, and that the leading end of the recording paper 12 does not come off the chuck 22 or break. To (The position of the recording paper 12 thus tensioned is hereinafter referred to as a fixed position of the recording paper 12.) The ink sheet 18 provides the start position of the yellow ink area (Y) at the position of the thermal head 17A. Until the rotation, the ink sheet take-up roll 19 is rotated in the h direction by the pulse motor 13 and taken up. In this case, the determination of the winding amount is performed by, for example, a method of marking and detecting the start position of the yellow ink area (Y) and detecting the position. Next, the thermal head 17A presses the recording paper 12 at a fixed position via the ink sheet 18 with a predetermined pressure of the platen roller 16 (the position of the thermal head 17). Then, a recording signal is sent to the thermal head 17 to cause necessary heating elements to generate heat, to melt the yellow ink and to selectively transfer it onto the recording paper 12. The pulse motor 13 is intermittently driven each time printing of one line is completed as described above, and the platen roller 16 and the ink sheet take-up roll 19 are rotated in the i and h directions, respectively, so that the recording paper 12 and the ink sheet 18 are rotated. Is conveyed by a predetermined distance to perform sub-scanning. During this time, the feed rollers 14 and 15 rotate accompanying the recording paper 12 while giving an appropriate back tension to the recording paper 12. Also, the recording with yellow ink progresses and the recording paper
When the recording paper 12 is transported to such an extent that strong tension is not applied between the holding position of the recording paper 12 and the pressing position by the thermal head 17, even if the chuck 12 is loosened and the chuck is in the state of 22A, the chuck unit 23 is It is rotated around the fixed shaft 24 in the j direction by a driving means (not shown) to be in the state of 23A, and sufficient space for the recording paper 12 to be loosened is provided. When the printing of the predetermined area with the yellow ink is completed as described above, the thermal head is set to the state of 17A, and the feed rollers 14 and 15 are rotated in the reverse direction for a predetermined time to return the recording paper 12 in the g direction. At this time, the chuck unit is returned to the state of 23 before a strong tension is applied between the holding position and the pressing position of the recording paper 12 so as to match the fixed position before recording. The feed rollers 14 and 15 are operated so as to be in a tension state after the recording paper 12 is returned.
A back tension is applied to 12 in the direction of arrow g. As a result, the recording paper 12 returns to the same state (fixed position) as when recording was started. Further, after the recording is completed, the ink sheet 18 provides the end of the yellow ink area at the position of the thermal head 17A, so that the ink sheet take-up roll 19 is moved by the pulse motor 13 to the position of the thermal head 17 in the magenta ink area (M ) Until the start position is provided. The same operation is repeated for the magenta ink on the recording paper 12 thus returned to the initial state, the recording paper 12 is returned to the home position again, and finally recording is performed with cyan ink (C), and color recording of a fixed area is completed. I do. As described above, according to the present embodiment, by returning the chuck for holding the leading end of the recording paper to the original position and applying a back tension to the recording paper to tension the recording paper, the recording paper can be accurately pre-recorded. (Fixed position), whereby a high-quality color image with little color shift can be easily obtained. Further, by providing the chuck rotatably, the slack of the recording paper can be released. FIG. 4 is a basic configuration diagram of a recording apparatus showing a second embodiment of the present invention. In the same figure, 12 is a recording paper, 13 is a pulse motor, 14 and 15 are feed rollers, 16 is a platen roller, 17 is a thermal head, 17A is a thermal head separated from the platen roller 16, 18 is an ink sheet, and 19 is an ink sheet. An ink sheet take-up roll, 20 is an ink sheet supply roll, 21 is a recording paper supply roll, 22 is a chuck, and the above is the same as the configuration in FIG. 3 in that the chuck driving means and the recording paper detecting means are provided in the drum 25 so as to be built therein. The operation of the recording apparatus of the second embodiment configured as described above will be described below. The outline of the operation is the same as that of the recording apparatus of the first embodiment. However, in the first embodiment, the chuck 22 is rotated by a fixed angle to provide room for the recording paper 12 to be loosened.
In this embodiment, the chuck 22 is mounted on the drum 25, and the recording paper 12 is wound around the drum 25 while rotating. That is, when recording is started and the recording paper 12 starts to loosen, the drum 25 starts rotating in the k direction and winds up the recording paper 12 that has been loosened so that strong tension is not applied to the recording paper 12 between the clamping position and the pressing position. To go. When recording for one color is completed, the thermal head is set at 17A, and the recording paper 12 is pulled in one direction by the feed rollers 14 and 15. At this time, the drum 25 rotates in the m direction so that a strong tension is not applied to the recording paper 12 and returns the wound recording paper 12. The drum 25, which has been rotated in the opposite direction by the same amount as during recording, stops when the chuck 22 reaches the same position as before recording. After aligning the leading edge of the recording paper 12 with the fixed position before recording in this way, and simultaneously making the tension state,
The second color is recorded, and the third color is recorded in the same manner. As described above, according to this embodiment, by providing the chuck for holding the leading end of the recording paper on the drum, not only the same effect as in the first embodiment can be obtained, but also the loosened recording paper is wound around the drum. This can save unnecessary space and reduce the size of the device. FIG. 5 is a basic configuration diagram of a recording apparatus according to a third embodiment of the present invention. 12 is a recording paper, 13 is a pulse motor, 16 is a platen roller, 17 is a thermal head, 17A is a thermal head separated from the platen roller 16, 18 is an ink sheet, 19 is an ink sheet take-up roll, and 20 is an ink sheet. A supply roll 21 is a recording paper supply roll, which has the same configuration as that of FIG. The difference from the configuration of FIG.
The difference is that rollers 26 and 27 that can be switched between stages are provided, and that a platen pressing roller 28 that presses against the platen roller 16 and a detector 29 that detects the leading end of the recording paper 12 are provided. The operation of the recording apparatus of the third embodiment configured as described above will be described below. The recording paper 12 taken out from the recording paper supply roll 21 is n by rollers 26 and 27.
Conveyed in the direction. At this time, the pressing force of the rollers 26 and 27 is set to the weaker pressing force. In the state of the thermal head 17A, the leading end of the conveyed recording paper 12 passes through the gap between the thermal head 17A and the platen roller 16, and the platen roller 16 rotating in the o direction in synchronization with the rollers 26 and 27. Along with this, the rotating platen holding roller
After passing through the press-contact portion 28, it is detected by the detector 29. After a lapse of a certain time from this detection, the rollers 26 and 27 and the platen roller 16 stop. Then with roller 26
The pressing force of 27 is strengthened and the recording paper 12 is pinched and fixed at the pressing position. Then, the platen roller 16 is further rotated in the direction o for a certain period of time with the platen holding roller
Back tension to remove slack. Then, by the ink sheet take-up roll 19,
When the ink sheet 18 is wound until the start position of the yellow ink area (Y) is provided at the position of the thermal head 17A, the thermal head 17A moves to the position of 17 and the recording paper 12 is transferred to the platen roller 16 via the ink sheet 18. Press with the specified pressure. Each time the platen roller 16 and the ink sheet take-up roll 19 driven in the p and q directions by the pulse motor 13 intermittently convey the recording paper 12 and the ink sheet 18 one step at a time, the heating element of the thermal head 17 is turned off. The yellow ink is transferred by selectively generating heat. During this time, an appropriate back tension is given to the recording paper 12 feeding side of the recording paper 12 by preventing the platen holding roller 28 from rotating.
When the printing of the predetermined area with the yellow ink is completed as described above,
Stop the platen roller 16 and the ink sheet take-up roll 19, and
To the state of 17A. Then, the platen roller 16 is rotated in the direction o with the platen holding roller 28 to remove the slack of the recording paper 12 generated between the platen roller 16 and the press-contact portions of the rollers 26 and 27. Return to the state before pressing.
Next, the above printing operation is sequentially performed for the magenta ink and the cyan ink, and the color printing of the determined area is completed. As described above, according to the present embodiment, the same effect as that of the first embodiment can be obtained by making the means for nipping the leading end of the recording paper double as the feed roller, and the apparatus can be downsized. it can. In the first embodiment, the rotation direction of the chuck unit 23 is set to j, but may be reversed. In the second embodiment, the drum 25 rotates in the k direction.
The direction may be m. In the third embodiment, the rollers 26 and 27 are stopped during recording, but the rollers 26 and 27 rotate or move while holding the leading end of the recording paper 12 so that the recording paper 12 is easily loosened. A configuration may be adopted. Further, in the first and second embodiments, the holding means is rotatable or rotatable, but the holding means may be fixed. Further, in all of the embodiments, the recording paper supply means is a roll paper, but it goes without saying that other continuous paper or a short form may be used. Although the recording paper 12 is supplied from the right side in the drawings in all the embodiments, the same effect can be obtained by supplying the recording paper 12 from the left side. In all the embodiments, the recording paper is conveyed at the pressure contact position with the thermal head by rotating the platen roller.However, the platen roller is not driven to rotate, and a capstan roller and a pinch roller are separately provided. A similar effect can be obtained even if the recording paper is conveyed by pressing the recording paper between them and rotating the capstan roller. Effect of the Invention As described above, the recording apparatus of the present invention is capable of moving a plurality of recording papers at the same
In a recording apparatus that performs recording by overlapping colors, a printing unit, a platen roller that presses the printing unit through the recording paper, and a recording paper sending side of the printing unit that do not slip the leading end of the recording paper And a chuck which is located at the same position at the start of recording and which is a means for applying back tension to the recording paper disposed on the recording paper feeding side of the printing means.
And a step until the printing means presses against the platen roller before starting recording of each color.
The back tension applying means interposes the recording paper between the holding portion and the back tension applying portion by the chuck.
The feature that the tension is applied to the step allows the recording paper to return to a fixed position accurately, and high-quality color recording with little color shift can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a basic configuration of a conventional recording apparatus, FIG. 2 is a plan view of a general ink sheet, and FIG. 3 is a view showing a first embodiment of the present invention. FIG. 4 is a side view showing a basic configuration of a recording apparatus, FIG. 4 is a side view showing a basic configuration of a recording apparatus according to a second embodiment of the present invention, and FIG. It is a side view which shows a structure. 12 Recording paper, 14, 15 Feed roller, 16 Platen roller, 17 Thermal head, 18 Ink sheet, 22 Chuck, 23 Chuck unit, 25
… Drum, 26,27… Roller, 28 …… Platen holding roller.

Claims (1)

Claims: 1. A printing method in which a color is overlapped a plurality of times at the same place while reciprocatingly transporting a recording paper.
In the recording apparatus to be performed, a printing unit, a platen roller that is pressed into contact with the printing unit via the recording paper, and a recording paper sending side of the printing unit, are nipped and fixed so that the leading end of the recording paper does not slip, and at the start of recording. A chuck located at the same location, and a back tension applying unit for applying a back tension to the recording paper disposed on the recording paper feeding side of the printing unit,
Until the printing means presses against the platen roller before recording starts,
Force applying means for holding the recording paper by the chuck by the chuck and the back tension applying means;
A recording device , wherein the recording device is tensioned between the recording devices. 2. The printing apparatus according to claim 1, wherein the chuck moves in a direction away from the printing means during the printing operation while holding the leading end of the printing paper so as not to slip, and returns to the original position before the start of the next printing. 2. The recording apparatus according to claim 1, wherein: 3. The recording paper is wound around the drum by the rotation of the drum during the recording operation, and the recording paper is wound around the drum during recording operation so that the chuck provided on the drum does not slip the leading end of the recording paper. 2. The recording apparatus according to claim 1, wherein the recording paper returns to an original position by reverse rotation of the drum. 4. The recording apparatus according to claim 3, wherein the conveyance of the recording paper is performed by a drum.