JPS63286375A - Recorder - Google Patents

Abstract

PURPOSE:To enable a recording to be conducted over the full surface of a recording paper, by using an ink sheet held between a printing head and a platen as a guide for the recording paper. CONSTITUTION:With an ink sheet carry motor 51 rotating in the direction of the arrow D, a take-up pulley 52 and a supply pulley 53 rotate respectively in the directions of arrows F and G. At this time, a take-up pinion gear 55 comes into a free state, thus failing to transmit the rotating force to a take-up side reel gear 57. On the other hand, a supply pinion gear 56 comes into a locked state, thus transmitting the rotating force to a supply side reel gear 57 to rotate the supply side reel gear 57 in the direction of the arrow L. Accord ingly, a supply reel 32 rotates in the direction of the arrow L to carry an ink sheet 31 reversely to a carry direction in recording, whereby the ink sheet serves as a guide in the reverse carrying of a recording paper 41.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording device for recording characters, images, etc. on recording paper.

Conventional technology In devices that make color hard copies of display screens such as CRTs and recording devices such as digital full-color copiers, inks of three colors yellow, magenta, and cyan, or four colors including black, are sequentially applied. Using a color ink sheet, for example, pixels with a yellow component are formed on a recording paper with yellow ink, then pixels with a magenta component are formed on the screen by removing the magenta ink, and in this way, the third color is sequentially formed. A recording device that records up to cyan or the fourth color black to obtain a color image is often used.

A conventional example of this type of recording device will be described below.

FIG. 8 shows a schematic configuration of a conventional recording apparatus.

In the figure, 1 is a thermal head, and an ink sheet 5
and is pressed against the platen 12 via the recording paper 4. Two auxiliary rollers 3 are pressed against the platen 12. The ink sheet 5 is supplied from a supply reel 6 and wound onto a take-up reel 7.

In the above configuration, the first color ink sheet 5 (for example, yellow) and the recording paper 4 are connected to the thermal head 1 and the platen 1.
While rotating the platen 12 in the direction of the arrow A while sandwiching it between the ink sheet 5 and the ink sheet 2, the thermal head 1, which generates heat according to the input recording signal, transfers the ink on the ink sheet 5 onto the recording paper. Obtain the image by: When the recording of the screen text is completed and the state shown in FIG. 9 is reached, the thermal head 1 is separated from the platen 12 by a head pressing mechanism (not shown), and the state shown in FIG. 10 is achieved. Thereafter, the platen 12 is reversed in the direction of arrow B, which is opposite to the direction of arrow A, as shown in FIG.

At this time, the recording paper 4 is conveyed in the opposite direction to the conveyance direction during recording due to the pressure contact force between the auxiliary roller 3 and the platen 12, and the recording start position of the first color reaches the thermal head 1-1 heat generation position [-2]. When the rotation of the platen 12 stops and the recording paper 4
Transport of the equipment will also be stopped. During this time, the ink sheet 5 is wound up by the take-up reel 7, and is on standby with the leading edge of the second color (for example, magenta) at the heat generating position of the thermal head 1. Thereafter, the thermal head 1 is again pressed against the platen 12, resulting in the state shown in FIG. 8, and recording of the second color is performed.

In this way, recording is performed sequentially to the third color (for example, cyan) and, if necessary, to the fourth color (black), and a color hard copy is obtained by subtractive color mixture of yellow, magenta, and cyan, and black.

Problems to be Solved by the Invention By the way, it is desirable for an output device for a facsimile or a copying machine to be able to output all the information of an input document onto a sheet of paper exactly the same size as the input document. For example, for an A4-size document, it is desirable to be able to record all the blank spaces (every corner) on A4-size recording paper without missing any information on the document.However, in conventional recording devices, the recording paper is transported by a platen. This is done using two auxiliary rollers, and once the recording paper is removed from the sandwiched position between the platen and the auxiliary rollers, the recording paper cannot be conveyed.Therefore, during recording, the recording paper is always The recording paper had to be sandwiched between the platen and the auxiliary roller, and an image could not be formed in the area L in Figure 9.To solve this problem, the recording paper was placed between the two auxiliary rollers. Although it is conceivable to provide a guide, there is a problem in that it is structurally difficult to install this recording paper guide because a thermal head is interposed in the recording paper path between the two auxiliary rollers.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses an ink sheet sandwiched between a print head and a platen as a guide for recording paper.

Function: With the means described above, even if the recording paper is once separated from the print head, the recording paper is guided to the position of the print head again by the ink sheet.

Embodiment FIG. 1 is a schematic diagram of a recording apparatus which is an embodiment of the present invention. 21 is a thermal head that has a plurality of heating elements arranged in a line and generates heat according to the input recording signal, and three colors of ink of yellow, macenta, and cyan are sequentially applied and wound into a roll. Ink sheet 3
1 (hereinafter referred to as an ink sheet) and a recording paper 41 wound into a roll are attached to a platen 42 whose outer periphery is covered with an elastic material to a pressure release plate 22 located above the thermal head 21. The head is pressed by a head pressing spring 24 via a suppressor 23 . The thermal head 21 is pressed by a head pressing spring 24 via a presser 23 attached to a pressure release plate 22 for separating the presser 23 from the thermal head 21 .

A presser release arm 25 for separating the presser 23 from the thermal head 21, and a presser release arm 25 for separating the presser 23 from the thermal head 21, and a platen 42 for moving the thermal head 21 away from the thermal head 21.
A head release arm 26 is attached to the cam arm shaft 27 and is located at the bottom of the platen 42. The presser release arm 25 and the head release arm 26 are moved starting from the cam arm shaft 27 by a head drive cam 28 in which a cam for moving the presser release arm 26 is integrated. The recording paper 41 is conveyed by a capstan roller 43 and a pinch roller 44. A reverse capstan roller 45 and a reverse bin roller 46 assist in conveying the recording paper 41. Platen 4
2 receives power from a capstan roller 43 via a one-way clutch and a torque limiter (not shown),
When the capstan roller 43 rotates in the direction of arrow 1, the platen 42 is free, and when the capstan roller rotates in the direction of arrow J, the one-way clutch is locked and the platen 42 is rotated in the N direction. It is configured to rotate faster than the capstan roller 43. When the capstan roller 43 is rotated in the direction of arrow J with the thermal head 21 pressed against the platen 42 and the recording paper 41 straddled between the capstan roller 43 and the platen 42, the platen 4
2 tries to rotate faster than the capstan roller 43, but because it rotates at the same circumferential speed as the capstan roller 43 due to the torque limiter, tension is stably applied to the recording paper 41. Note that the reverse capstan roller 45 and the platen 42 are directly connected and rotate in synchronization. A peeling roller 47 provided between the platen 42 and the capstan roller 43 separates the ink sheet 31 from the recording paper 41 after recording, and a sheet guide provided between the platen 42 and the reverse capstan roller 45 The roller 48 guides the ink sheet. A peeling roller 47 and an ink sheet guide roller 48 guide the ink sheet. Peeling roller 4
7 and an ink sheet guide roller 48 are attached to the thermal head 21 by a roller holder 49, and move up and down with the thermal head 21 with respect to the platen 42 with the head rotation shaft 20 as a fulcrum. The ink sheet 31 is supplied from the supply reel 32 and taken to the take-up reel 3.
It is wound up by 3. FIG. 2 is a schematic diagram of the gears and pulleys of the ink sheet conveying section. In the figure, 51 is an ink sheet conveyance motor. 52 is a take-up pulley, and 53 is a supply pulley. Both pulleys are rotated by the ink sheet conveying motor 51 via a timing belt 54. Take-up pulley 5.
A take-up pinion gear 55 having a built-in one-way clutch that locks when the take-up pulley 52 rotates in the direction of arrow E is coaxially attached to the take-up pinion gear 2. Further, a supply pinion gear 56 having a built-in one-way clutch that locks when the supply pulley 53 rotates in the direction of arrow G is coaxially attached to the supply pulley 53. A reel gear 57 is attached to both the take-up side and the supply side, and is rotated by a take-up pinion gear 55 and a supply pinion gear 56, respectively.

FIG. 3 is a top view of FIG. 2, and in FIG. 3, the torque plate 61 to which the felt 61a is attached is replaced by the transmission plate 62.
reel gear 57 by torque generating spring 63 via
is pressed against. The transmission plate 62 is rotated by the frictional force between the reel gear 57 and the torque plate 61, and the leaf shaft 65 is rotated by the pin 64. reel shaft 6
A winder 66 is attached to the tip of the winder 5, and the winder 66 rotates the supply reel 32 and take-up reel 33 shown in FIG.

Next, the operation will be explained.

Figure 4 is an enlarged view of the recorded portion of Figure 1.
In the figure, a first color ink sheet 31 (for example, yellow) and recording paper 41 are connected to a thermal head 21 and a platen 4.
2 and the capstan roller 43 with the necessary pressure for recording! When rotated in the direction, platen 4
2 rotates in the direction of arrow M due to the frictional force with the recording paper 41. The ink on the ink sheet 31 is transferred to the recording paper 41 that is being conveyed by the thermal head 21 that is heated by the recording signal, and an image is formed from the midsection of the recording paper 41 toward the leading edge. That's what I do. The recording paper and ink sheet on which the transfer has been performed are then peeled off by a peeling roller 47. The conveyance speed at which the recording paper leaves the platen and is conveyed to the peeling roller after recording is completed (
The conveyance speed is approximately the same as that during recording, and the entire screen is peeled off under the same peeling conditions, and the cooling time of the melted and transferred ink during recording is constant throughout the screen, so there is no deterioration in image quality due to differences in cooling time. Good images can be obtained.

The operation of the ink sheet 31 at this time will be explained using FIG. 2. In FIG. Each rotates in the direction of arrow H. At this time, the take-up pinion gear 55 is locked as described above, rotates together with the take-up pulley 52, and transmits rotational force to the take-up reel gear 57, which rotates in the direction of the arrow. On the other hand, the supply pinion gear 56 is in a free state as described above, and no rotational force is transmitted to the reel gear 57.

Therefore, the take-up reel 33 shown in FIG. 1 rotates in the direction of the arrow to take up the ink sheet 31. FIG. 5 shows a state in which recording for one screen has been completed. As shown in FIG. 5, when the end of the recording paper 41 passes over the peeling roller 47 and the separation from the ink sheet is completed, an extra load is applied to the ink sheet conveyance motor and the recording paper conveyance motor as shown in FIG. In order to prevent this, the presser release arm 25 pushes up the presser release plate 22, the presser 23 separates from the thermal head 21, and the load on the platen 42 becomes only the weight of the thermal head 21 and its time keeping member.

Hereinafter, this state will be referred to as a weak pressure state, and the state in which the thermal head 21 is in pressure contact with the platen 42 will be referred to as a strong pressure state. When this operation is completed, the capstan 43 is rotated in the direction of arrow J, the platen 42 is rotated in the direction of arrow N, and the capstan roller 45 is rotated in the direction of arrow P to convey the recording paper 4 in the opposite direction to the conveyance direction during recording. do.

The operation of the ink sheet 31 at this time will be explained using FIG.
rotates in the direction of arrow F, and the supply pulley 53 rotates in the direction of arrow G. When reeling, the take-up pinion gear 55 is in a free state and no rotational force is transmitted to the reel gear 57 on the take-up side. Further, the supply pinion gear 56 is in a locked state and transmits rotational force to the supply side reel gear 57, and the supply side reel gear 57 rotates in the direction indicated by the arrow. Therefore, the supply reel 32 shown in FIG. 1 rotates in the direction indicated by the arrow, and the ink sheet 31 is transported in the opposite direction to the transport direction during recording.
This serves as a guide when conveying the material in the opposite direction. Then, the recording paper 4 is guided to the upper part of the platen 42 along the ink sheet 31, and when it comes to the contact position between the thermal head 21 and the platen, the platen and the ink sheet 31
The capstan roller 45 is sandwiched between the capstan roller 45 and the reverse feed capstan roller 45 . When the recording paper 41 is conveyed to the reverse feed capstan roller 45, the thermal head 21 and the ink sheet 31 are moved to the head release arm 2, as shown in FIG.
6, the recording paper 41 is moved away from the platen 42, and the recording paper 41 is further conveyed. When the first color recording start position reaches the heat generation position of the thermal head, the capstan roller 43 stops rotating and the recording paper 41 is no longer conveyed. will be stopped. When the recording paper 41 is conveyed in the opposite direction to the recording direction, the platen 42 is directly connected to the capstan roller 43 via the one-way clutch and the torque limiter as described above. Tension is applied stably, and the recording paper 41 is transported without skew or sagging. During this time, the ink sheet 31 is wound around the take-up reel 33 in the same manner as during recording until the second color reaches the heat generating position of the thermal head 21, and then stopped. After that, the thermal head 21 is again pressed against the platen 42, and the fourth
The state shown in the figure is reached, and recording of the second color (for example, magenta) is performed. This series of operations is performed sequentially up to the third color (for example, cyan), and color images, characters, etc. are obtained.
Thereafter, the recording paper is cut into a predetermined length by a cutter 50 and discharged. Note that in the present invention, the conveyance speed when the recording paper leaves the platen and is conveyed to the peeling roller during recording is approximately the same as the conveyance speed during recording, but even if the conveyance speed is faster than the conveyance speed during recording. Good color images, characters, etc. can be obtained during transport when the recording paper leaves the platen and is transported to the peeling roller.

Increasing the speed can shorten the recording time.

In this embodiment, a printing device using a thermal head as a printing head has been described as an example, but an impact dot type printing head may also be used.

Effects of the Invention As described above, in the present invention, by using an ink sheet as a guide for feeding the recording paper, even if the recording paper is removed from the print head, it is possible to guide the recording paper back to the position of the print head. , full screen recording is possible. Also,
At this time, the above operation can be performed more easily by transporting the ink sheet in a direction opposite to the transport direction during recording. In addition, by switching the pressure of the thermal head in two stages, strong and weak, and configuring a one-way clutch with different locking directions in the ink sheet transport section, it is possible to transport the ink sheet in forward and reverse directions with a single motor, making it possible to transport the ink sheet. The recording paper separated from the platen can be stably transported without applying an extra load to the motor or the recording paper transport motor, and this has a great industrial effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a recording apparatus according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an ink sheet conveying section gear and pulley of the recording apparatus according to an embodiment of the present invention, and FIG. FIG. 4 is a schematic diagram showing the printing state of the recording device in an embodiment of the present invention, and FIG. FIG. 6 is a schematic configuration diagram showing the recording peeling state of the recording device, and FIG. 7 is a schematic configuration diagram showing the first reverse feed start state in which the thermal head press of the recording device is weak pressure in an embodiment of the present invention. 8 is a schematic configuration diagram showing a second reverse feeding state in which the thermal head and ink sheet of the recording device according to an embodiment of the present invention are separated from the platen, and FIG. 8 is a schematic configuration diagram showing the recording state of the recording device in a conventional example. 9 is a schematic configuration diagram showing a recording end state of a conventional recording device, FIG. 10 is a schematic configuration diagram showing a reverse feed start state of a conventional recording device, and FIG. 11 is a schematic configuration diagram of a conventional recording device FIG. 2 is a schematic configuration diagram showing a reverse feeding state. 21... Thermal head 31... Ink sheet 41... Recording paper 42... Platen 47... Peeling roller Name of agent Patent attorney Toshio Nakao and 1 other 3r---
Ink sheet 41 - 11 names and width (Fig. 5 21 - tr-711/s -A:31-), ink sheet 4f - 11 pillows φ extension, Fig. 6 2f - 7 - Maru 1.7Y. Fig. 7 2f - 11 sho Maru yk 3f - - Ishikshi L 4f --- $ Do n thread b4 Fig. 8 f9 Fig. 9 Fig. 10 Fig. 11

Claims (7)

[Claims] (1) A print head having a plurality of printing elements that selectively perform printing operations according to input recording signals, an ink sheet conveyance means for conveying an ink sheet, a recording paper wound in a roll, and It has a platen that sandwiches the ink sheet between the print head and a recording paper conveying means that feeds the recording paper forward and backward, and prints from the middle of the recording paper toward the leading edge, and after the printing is completed. The recording paper is further conveyed in the same direction until it comes off the print head, and then the leading edge of the recording paper is brought into contact with the ink sheet and the recording paper is conveyed in the opposite direction to the conveyance direction during printing. A recording apparatus characterized in that the recording paper is guided to a position of a print head using the ink sheet as a guide. (2) The ink sheet conveying means has a supply reel that supplies unused ink sheets, and a take-up reel that winds up used ink sheets, which are disposed coaxially with each reel and interoperate with each other. A supply side torque limiter and a take-up side torque limiter having different locking directions;
2. The recording apparatus according to claim 1, further comprising an ink sheet transport motor that drives the supply reel and the take-up reel through two torque limiters. (3) Claims characterized in that the platen is configured such that it does not generate a driving force when rotating during recording, but generates a driving force when rotating in a direction opposite to the rotational direction during recording. The recording device according to item 1. (4) The recording apparatus according to claim 1, wherein the print head is a thermal head equipped with a plurality of heating resistive elements that generate heat according to input recording signals. (5) The ink sheet conveyance means is configured to be able to forward and reverse the ink sheet, so that when the recording paper is not sandwiched between the thermal head and the platen, the leading edge of the recording paper is conveyed in the opposite direction to that during recording. 2. The recording apparatus according to claim 1, wherein the ink sheet is guided between a thermal head and a platen by a rotating ink sheet. (6) The recording paper is guided between the thermal head and the platen while the thermal head is in contact with the platen via an ink sheet.
Recording device described in section. (7) The pressing force of the thermal head can be switched in at least two levels, strong and weak, so that the pressure is set to strong when recording on the recording paper, and the pressure is set to low when the recording paper is conveyed in the opposite direction to the direction of conveyance during recording. 7. The recording device according to claim 6, wherein the recording device is brought into a pressure state.