JPS6071282A - Recorder - Google Patents

Abstract

PURPOSE:To enhance accuracy in positioning a recording paper at an initial position, by providing a means for clamping the leading end of the recording paper and fixing, turning or fitting it onto a drum and a back-tensioning means for setting the paper into a tensioned condition. CONSTITUTION:The leading end of the recording paper 12 is fed sequentially through a pressing part between feeding rollers 14, 15 and a gap between a plate 16 and a thermal head 17A, and when to reaches the position of elements of a chuck 22 in a released condition, a detector provided in a chuck unit 23 detects the recording paper 12, and sends a signal for setting the chuck 22 into a clamping condition to a chuck-driving means. When the lading end of the paper 12 is clamped, the rollers 14, 15 are rotated reversely for a predetermined period of time to exert a back tension in the direction of an arrow (g) on the paper 12. The feeding force of the rollers 14, 15 at this time is so set as to be sufficient for removing a sag or a deviation in the width direction of the paper 12 and to ensure that the leading end of the paper is not released from the chuck 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording device used as a hard copy for computers and the like.

Conventional configurations and their problems In recent years, as computer display devices have become more color-based, color printers, which are output devices, have also reached the stage of practical use. In particular, in the field of computer art that uses graphic display devices, high quality, high quality color images are required, and
It can be said that printers for magnetic cameras are required to have image quality comparable to that of silver halide photography. However, as the recording density increases, it becomes more difficult to obtain high-quality color images.

A conventional recording device will be explained below. Figure 1 shows a basic configuration diagram of a conventional color recording device.
2 is a recording paper, 2 is a pulse motor, 3 and 4 are feeders that clamp and convey the recording paper 1 with a predetermined pressure, 6 is a platen roller driven by a nokuru smoke 2, and 6 A thermal head is equipped with heating elements arranged in a straight line in the width direction of the recording paper 10, and is arranged so as to press against or separate from the platen roller 5 with a predetermined pressure through the recording paper 1. Reference numeral 7 indicates a platen holding roller that is in weak pressure contact with the platen roller 5 through the recording paper 1, and 8 indicates a platen holding roller that is in contact with the platen roller 5 with a weak pressure through the recording paper 1.As shown in FIG. (The ink sheets are coated on the base film in the order of q. 9 is the ink sheet winding 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. In 1 where the recording paper 1 is mounted, the thermal roller is separated from the platen roller 6, and the feed roller 3 and the platen roller 5, together with the feed roller 4 and the platen presser row 27, move the recording paper 1 a. It rotates to convey it in the direction. Then, when the leading edge 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 of the platen roller 6 and the platen pressing roller 7, The presser roller 7 stops rotating, and the recording paper 1 also stops at the same time. Then, only the feed rollers 3 and 4 are connected to the recording paper 1.

The recording paper 1 is rotated in reverse for a certain period of time while the recording paper 1 is rotated in the reverse direction to remove slack, and the thermal head 6 is brought into pressure contact with the latte roller 6 via the recording paper 1 and the ink sheet 8. At this time, the ink sheet 8 first supplies the starting position of the surface coated with the yellow ink layer (1) 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 on the ink sheet 8 and selectively transfer it onto the recording paper 1.Meanwhile, the pulse motor 2 The roller 6 and the ink sheet take-up roll 9 are each driven intermittently in directions B and C, and each time the thermal head 6 finishes recording one line, the recording paper 1 and the ink sheet 8 are conveyed a predetermined distance. . At this time, the feed rollers 3 and 4 rotate along with the recording paper 1 while applying appropriate pack tension to the recording paper 1. When the recording with the yellow ink in the recording area determined as described above is completed, the thermal head 6 is separated from the platen roller 6 and the ink sheet 8 is separated from the recording surface of the recording paper 1. Then, when the platen roller 5 is rotated in the d direction by the noclus motor 2 by the same number of steps as during recording, the recording paper 1 is conveyed by the frictional force of the pressure contact between the platen pressing roller 7 and the platen roller 5, and reaches the fixed position. be reversed. At this time, the feed rollers 3 and 4 apply tension in the direction e to such an extent that the recording paper 1 does not bend. Further, at the end of recording, the ink sheet 8 provides the end position of the yellow ink area at the position of the thermal head 6.

During the above-mentioned reverse operation, the ink sheet take-up roll 9 is released from the driving force of the pulse motor 2 by a one-way clutch or the like, so the ink sheet take-up roll 9 is rotated to a predetermined position by another driving means (not shown). Wind up the ink sheet 8 by a length of , and align the starting position of the magenta ink area) with the position of the thermal head 8. With the recording paper 1 that has returned to its normal position, repeat the same operation as described above for the magenta ink, return only the recording paper 1 again, and finally print the cyan ink (color for the specified area by printing with q). End recording.

However, in such conventional recording devices, there are limits to the shape accuracy and uniformity of the friction coefficient of the platen roller and platen presser roller, which inevitably results in uneven feeding in the width direction and feeding direction of the recording paper, resulting in problems such as those described above. With this configuration, when the recording paper is returned to its normal position, the displacement of the recording paper caused by this uneven feeding is not corrected, so the displacement of the three colors is accumulated, resulting in a decrease in print quality. Was.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and improves the alignment of the initial position of the recording paper compared to the conventional method by correcting the initial position of the recording paper every time one color is recorded. The present invention provides a recording device that enables high-quality color recording with increased precision and less color shift.

Structure of the Invention The present invention comprises a recording paper, a printing means, a platen roller, a means for reciprocating the recording paper, a means for clamping the leading edge of the recording paper and fixing or rotating it, or mounting it on a drum.
This is a recording device equipped with a back tension imparting means for keeping the recording paper in a taut state, and the recording paper is held in a reciprocating state with positional reproducibility in the gripping section, and the back tension imparting means also provides recording paper. By removing slack in the paper, it is possible to accurately return the recording paper to its normal position.

DESCRIPTION OF EMBODIMENTS FIG. 3 shows a basic configuration diagram of a recording apparatus in a first embodiment of the present invention. In FIG. 3, 12 is a recording paper, 13 is a pulse motor, 14 and 15 are feed rollers that pinch and convey the recording paper 12 with a predetermined pressure, 16 is a platen roller driven by the pulse motor 13, and 17
A thermal head is equipped with heating elements arranged in a straight line in the width direction of the recording paper 130, and is arranged so as to press against or separate from the platen roller 16 with a predetermined pressure through the recording paper 12. 17A is a thermal head separated from the platen roller 16; 18 is a yellow (a) in which heat-melting ink covers a predetermined recording area;
Ink sheets are painted on the base film in the order of magenta (b) and cyan (q). 19 is an ink sheet take-up roll driven by a pulse motor 13;
o is an ink sheet supply roll, 21 is a recording paper supply roll, and 22 is a chuck disposed near the recording paper delivery side of the thermal head 17, and in the released state, the recording paper 1
2 can pass through between the upper and lower jaws of the chuck. 23 is a chuck unit incorporating the chuck 22, a chuck driving means, and a recording paper detecting means (none of which are shown); 24 is a fixed shaft to which the chuck unit 23 is rotatably mounted; 23A is the chuck unit after rotation; 22A indicates the chuck after the chuck unit has been rotated. Regarding the recording apparatus of this embodiment configured as described above,
The operation will be explained below. Initially, the thermal head 17 is 1
7A, back tension is applied to the ink sheet 18 so that it does not loosen and is brought into contact with the thermal head 17A, so a gap exists between the platen roller 16 and the thermal head 17A. Also, the feed rollers 14,1
6 rotates to convey the recording paper 12 in the f direction. Then, the leading edge of the recording paper 12 taken out from the recording paper supply roll 21 passes through the pressure contact between the feed rollers 14 and 15, and the gap between the platen 16 and the thermal head 17A in this order, and the chuck 22 is in the released state. When the position of the chuck is reached, the detector in the chuck unit 23 detects the recording paper 12 and sends a signal to the chuck driving means to bring the chuck to the 1.5-inch state, and the rollers 14 and 15 are told to stop. send a signal. When the leading edge of the recording paper 12 is clamped in this way, the feed rollers 14 and 16 rotate in reverse for a certain period of time, and the recording paper 12
Apply back tension in 9 directions to 2. At this time, the feed roller 14
The conveyance force 15 is set to be sufficient to remove slack in the recording paper 12 and deviation in the width direction of the recording paper 12, and to prevent the leading edge of the recording paper 12 from coming off the chuck 22 or being torn.

(The position of the recording paper 12 in this tensioned state is hereinafter referred to as the normal position of the recording paper 12.) The ink sheet 18 also provides the starting position of the yellow ink area (1) at the position of the thermal head 17A. Pulse motor 1 until
3, the ink sheet winding roll 19 is rotated in the h direction and the ink sheet is wound up. In this case, the winding amount is determined by, for example, marking the starting position of the yellow ink area (1) and detecting the position. Next, the thermal head 17A presses the recording paper 12 at a predetermined position against the platen roller 16 with a predetermined pressure via the ink sheet 18 (position of the thermal head 17). Then, a recording signal is sent to the thermal head 17 to cause a necessary heating element to generate heat, melting the yellow ink and selectively transferring it onto the recording paper 12. Each time one line of recording is completed as described above, the pulse motor 13 is driven intermittently, and the platen roller 16
The recording paper 12 and the ink sheet 1 are rotated in the i and h directions, respectively.
8 is conveyed a predetermined distance and sub-scanning is performed. During this time, the feed rollers 14 and 16 rotate along with the recording paper 12 while applying an appropriate back tension to the recording paper 12. Also, as the recording with yellow ink progresses, the recording paper 12 begins to loosen.
Even if the chuck is in the 22A state, the recording paper 12
When the recording paper 12 is conveyed to such an extent that strong tension is not applied between the clamping position of the thermal head 17 and the pressing position of the thermal head 17, the chuck unit 23 is rotated in the direction of 23A around the fixed shaft 24 by a driving means (not shown). The recording paper 12 is given sufficient space to relax. When the recording of a predetermined area with yellow ink is completed as described above, the thermal head is placed in the state 17A, and the feed rollers 14 and 15 are rotated in reverse for a certain period of time to return the recording paper 12 in the q direction. At this time, the head unit is returned to the state 23 before strong tension is applied between the holding position and the pressure contact position of the recording paper 12, and the head unit is brought into alignment with the pre-recording position. The feed rollers 14 and 15 are still in contact with the recording paper 12.
The recording paper 12 is also returned to its normal position by being operated so as to be in a tensioned state after being reversed. Further, after recording is completed, the ink sheet 18 provides the end position of the yellow ink area at the position of the thermal head 17A, so the pulse motor 13 removes the ink sheet.

- Rotate the wheel 19 until the position of the thermal head 17 is provided with the starting position of the magenta ink area (3). The same operation is repeated for the magenta ink on the recording paper 12 that has returned to its initial state in this way, and the recording paper 12 is returned to its normal position again.Finally, the cyan ink (q) is used to perform recording to complete the color recording of a certain area. .

As described above, according to this embodiment, the means for holding the leading edge of the recording paper is returned to its original position before recording, and at the same time, tension is applied to the recording paper to make it tense, thereby returning the recording paper to its normal position before recording. This makes it possible to easily obtain high-quality color images with little color shift. Further, by providing the holding means in a rotatable manner, slack in 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 figure, 12 is a record of words, 13L [
Pulse motors, 14 and 16 (feed roller, 16i1 platen roller, 17 is thermal head 3.1yl:] Thermal head in a state separated from nib platen roller 16,
18 is an ink sheet, 19 is a (-/comb 1/take-up roll, 20 is an ink sheet supply roll, 21 is a recording paper supply roll, and 22 is a chuck. The above structure is the same as that shown in FIG. 3. The difference from the configuration shown in FIG. 3 is that a chuck driving means and a recording paper detecting means are provided inside the drum 25.

The operation of the recording apparatus of the second embodiment configured as described above will be described below. The outline of the operation is also the same as that of the recording apparatus of the first embodiment. However, in the first embodiment, the chuck 22 rotated by a certain angle, giving room for the recording paper 12 to loosen, but in this embodiment, the chuck 22 is mounted on a drum 26, and rotates to allow the recording paper 12 to loosen. This is the point at which the material is wound around the drum 25. That is, recording is started and
When the recording paper 12 begins to loosen, the drum 25 starts rotating in the direction of , and winds up the slack recording paper 12 between the clamping position and the pressure contact position [4] to the extent that strong tension is not applied to the recording paper 12. After recording one color, turn the thermal head to 17A.
state, 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 as not to apply strong tension to the recording paper 12, and returns the wound recording paper 12. The drum 26, which has thus rotated in the opposite direction by the same amount as during recording, comes to a stop when the chuck 22 comes to the same position as before recording. In this way, the leading edge of the recording paper 12 is brought into alignment with the pre-recording position and at the same time is brought into a tensioned state, and then the second color is recorded, and the third color is recorded in the same way. As described above, according to this embodiment, by providing a means for holding the leading edge of the recording paper on the drum, not only the same effect as the first embodiment can be obtained, but also the slack recording paper is wound around the drum. It is possible to reduce the size of the device by eliminating unnecessary space.

FIG. 5 is a basic configuration diagram of a recording apparatus showing a third embodiment of the present invention. 12 is recording paper, 13 is) (Rusmoke, 1
6 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,
2o is an ink sheet supply roll, and 21 is a recording paper supply roll, which is the same as the structure shown in FIG. 3. −
The configuration differs from the configuration shown in FIG.
The platen pressing roller 28 that presses against the recording paper 716 and a detector 29 that detects the leading edge of the recording paper 12 are provided.

The operation of the recording apparatus of the third embodiment configured as described above will be explained below. The recording paper 12 taken out from the recording paper supply roll 21 is transported by rollers 26 and 27.
conveyed in the direction. At this time, the pressure contact force between the rollers 26 and 27 is set to the weaker pressure contact force. The thermal head is in the state of 17A, and the leading edge of the conveyed recording paper 12 passes through the gap between the thermal head 17A and the platen roller 16, and is synchronized with the rollers 26 and 27. The light passes through the pressure contact portion of the platen row 216 rotating in the direction and the press contact portion of the platen pressing roller 28 rotating accordingly, and is detected by the detector 29. After a certain period of time has passed since this detection,
Rollers 26 and 27 and platen roller 16 stop. Next, the pressing force between the rollers 26 and 27 is strengthened, and the recording paper 12 is clamped and fixed at the pressing position. and platen presser roller 2
8 and the platen roller 16 for a further fixed period of time. direction to apply back tension to the recording paper 12 to remove slack. Then, when the ink sheet winding roll 19 winds up the ink sheet 18 until the starting position of the yellow ink area (7) is provided at the position of the thermal head 17A, the thermal head 17A moves to the position 17 and the ink sheet 18 is moved to the position 17. The recording paper 12 is pressed against the platen roller 16 with a predetermined pressure. The platen roller 16 is driven by a pulse motor 13 in the p and q directions, respectively.
Each time the ink sheet winding roll 19 intermittently transports the recording paper 12 and the ink sheet 18 one step at a time, the heating element of the thermal head 17 selectively generates heat to transfer the yellow ink.

During this time, the platen pressing roller 28 is kept from rotating to apply an appropriate back tension to the thermal head feeding side of the recording paper 12. When recording of a predetermined area with yellow ink is completed as described above, the platen roller 16 and the ink sheet take-up roll 19 are stopped, and the thermal head 17 is returned to the state 17A. Then, the platen roller 16 is moved along with the platen holding roller 28.

platen roller 16 and roller 26.2.
Remove the slack in the recording paper 12 that occurred between the pressure contact part 7 and
The recording paper 12 is returned to the state before being pressed against the thermal head. Next, the above recording operation is performed for magenta ink and cyan ink in sequence to complete color recording of a predetermined area. As described above, according to this embodiment, by making the feed roller also serve as a means for holding the leading edge of the recording paper, it is possible to miniaturize the apparatus instead of obtaining the same effect as in the first embodiment. I can do it.

In the first embodiment, the rotation direction of the chuck unit 2a is set to j, but it may be rotated in the opposite direction. Further, in the second embodiment, the drum 26 is assumed to rotate in the direction, but it may also rotate in the direction m. Further, in the third embodiment, the rollers 26 and 27 are stopped during recording, but the rollers 26 and 27 rotate or move while holding and fixing the leading edge of the recording paper 12, so that the recording paper 12 becomes easy to loosen. It may be configured as follows. Further, in the first and second embodiments, the clamping means is pivotable or rotatable, but the clamping means may be fixed. Further, in all of the embodiments, the recording paper feeding means is not a roll, but it goes without saying that other continuous paper or single sheets may be used. Further, in all the embodiments, the recording paper 12 is fed from the right side in the drawing, but the same effect can be obtained even if it is fed from the left side.

Effects of the Invention As described above, the recording apparatus of the present invention includes a recording paper, a printing means, a platen roller, a means for reciprocating the recording paper, a means for holding the leading edge of the recording paper, and a means for holding the recording paper under tension. By providing a back tension applying means to maintain this state, it is possible to accurately return the recording paper to its normal position and perform color recording with less color shift, which is of great industrial value.

[Brief explanation of drawings]

FIG. 1 is a side view showing the basic structure of a conventional printing apparatus, FIG. 2 is a plan view of a general ink sheet, and FIG. 3 is a side view showing the basic structure of a printing apparatus according to a first embodiment of the present invention. 4 is a side view showing the basic configuration of a recording device according to a second embodiment of the present invention, and FIG. 5 is a side view showing the basic configuration of a recording device according to a third embodiment of the present invention. . 12... Recording paper, 14, 15... Feed roller, 16... Platen roller, 17...
...Thermal head, 18...Ink sheet, 22...Chuck, 23...Chuck unit, 25...Dan/tram, 26.27...
...Roller, 28...Platen holding roller. Name of agent: Patent attorney Toshio Nakao and 1 other famous confectionery 1
Figure 3Figure 4Figure 5

Claims (3)

[Claims] (1) Recording paper and printing means facing the recording paper;
a platen roller disposed opposite to the printing means with the recording paper interposed therebetween; and a transporting means for reciprocating the recording paper;
A fixing means for clamping and fixing a part of the recording paper, which is arranged close to the recording paper feeding side of the printing means, and a backing means, which is arranged on the recording paper feeding side of the printing means, and which keeps the recording paper in a tensioned state. A recording device comprising a tension applying means. (2) The recording apparatus according to claim 1, wherein the fixing means is rotatably provided, and when the recording paper is returned, the fixing means is also returned to a normal position. (3) A patent claim characterized in that a fixing means is provided on the drum, and during a printing operation, the recording paper is wound around the drum, and when the recording paper is returned, the fixing means is also returned to the normal position. 1. The recording device according to item 1.