JPH0813566B2 - Recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording characters, images and the like on recording paper.

2. Description of the Related Art In a recording device such as a digital full-color copying machine or a device for making a color hard copy of a display screen such as a CRT, three colors of yellow, magenta and cyan, or four colors of ink with black added thereto are sequentially applied. Using a color ink sheet, for example, a pixel having a yellow component is formed on the recording paper with a yellow ink, and then a pixel having a magenta component is formed on the screen by using the magenta ink. A recording device that records a cyan image or a fourth color black to obtain a color image is widely used.

 Hereinafter, a conventional example of this type of recording apparatus will be described.

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

In the figure, reference numeral 1 is a thermal head, which is pressed against the platen 12 via the ink sheet 5 and the recording paper 4. Two auxiliary rollers 3 are pressed against the platen 12.
The ink sheet 5 is supplied from the supply reel 6 and wound on the 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.
While the platen 12 is rotated in the direction of arrow A while being sandwiched between it and 12, the ink on the ink sheet 5 is transferred onto the recording paper by the thermal head 1 which is heated according to the input recording signal. Get the image by. And
When the recording for one screen is completed and the state shown in FIG. 9 is reached, the thermal head 1 is separated from the platen 12 by the head pressing mechanism (not shown) and is brought into the state shown in FIG. Then, after that, the platen 12 is reversed in the arrow B direction opposite to the arrow A direction as shown in FIG. At this time, the recording paper 4 is conveyed in the direction opposite to the conveying direction at the time of recording due to the pressure contact force between the auxiliary roller 3 and the platen 12, and when the recording start position of the first color reaches the heat generating position of the thermal head 1, the platen 12 Is stopped, and the conveyance of the recording paper 4 is stopped. During this time, the ink sheet 5 is taken up by the take-up reel 7 and stands by in a state where the head of the second color (for example, magenta) is at the heat generation position of the thermal head 1. After that, the thermal head 1 is pressed again by the platen 12 to be in the state of FIG. 8, and the recording of the second color is performed. In this way, recording is sequentially performed for the third color (for example, cyan) and, if necessary, for the fourth color (black), yellow,
Color hard copy is obtained by subtractive color mixing with magenta and cyan and black.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, as an output device for a facsimile or a copying machine, it is desirable to be able to output all the information of an input original on a paper of the same size as the input original. For example, for an A4 size document, it is desired that the information can be recorded on the A4 size recording paper in every corner without any margin. However, in the conventional recording apparatus, the recording paper is conveyed by the platen and the two auxiliary rollers, and once the recording paper comes out of the position where the platen and the auxiliary roller are sandwiched, the recording paper can be conveyed. It's gone. Therefore, the recording paper must be always held between the platen and the auxiliary roller during recording, and an image could not be formed at the portion L in FIG. In order to solve this problem, it is conceivable to provide a recording paper guide between the two auxiliary rollers, but since the thermal head is interposed in the recording paper passage between the two auxiliary rollers, this recording paper guide should not be installed. There is a problem that it is structurally difficult.

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

By the above-mentioned means, even if the recording paper is once separated from the print head, the recording paper is guided again to the position of the print head by the ink sheet.

Embodiment FIG. 1 is a schematic configuration diagram of a recording apparatus which is an embodiment of the present invention. Reference numeral 21 is a thermal head that has a plurality of heating elements arranged in a line and that generates heat in response to an input recording signal. Ink of three colors of yellow, magenta, and cyan is sequentially applied and wound in a roll shape. Ink sheet 31
(Hereinafter referred to as an ink sheet) and a platen whose outer periphery is covered with an elastic body via a recording paper 41 wound in a roll shape.
A head pressing spring 24 press-contacts 42 with a pressing element 23 attached to a pressing release plate 22 above the thermal head 21. A head pressing spring 24 presses the pressing element 23 via a pressing element 23 attached to a pressing release plate 22 for separating the pressing element 23 from the thermal head 21. Pusher
Pusher release arm for separating 23 from thermal head 21
A head release arm 26 for separating the thermal head 21 from the platen 42 is attached to the cam arm shaft 27, and is disposed below the platen 42. The pusher release arm 25 and the head release arm 26 are driven by a head drive cam 28 that is integrated with a cam that moves the pusher release arm 26.
Is moved starting from the cam arm shaft 27. The recording paper 41 is conveyed by a capstan roller 43 and a pinch roller 44. The reverse feed capstan roller 45 and the reverse feed pinch roller 46 assist the conveyance of the recording paper 41. The platen 42 receives power from the capstan roller 43 via a one-way clutch and a torque limiter (not shown), so that when the capstan roller 43 rotates in the direction of arrow I, the platen 42 is in a free state. When the capstan roller rotates in the direction of arrow J, the one-way clutch locks and the platen 42 rotates in the N direction faster than the capstan roller 43. When the thermal head 21 is pressed against the platen 42 and the recording paper 41 extends between the rollers of the capstan roller 43 and the platen 42, when the capstan roller 43 is rotated in the direction of arrow J, the platen 42 is moved to the capstan roller. Although it tries to rotate faster than 43, the torque limiter rotates at the same peripheral speed as the capstan roller 43, so that tension is stably applied to the recording paper 41. The reverse-feeding capstan roller 45 and the platen 42 are directly connected and rotate in synchronization. Platen
The peeling roller 47 provided between the 42 and the capstan roller 43 peels the ink sheet 31 and the recording paper 41 after recording, and is a sheet guide roller provided between the platen 42 and the reverse feeding capstan roller 45. 48 guides the ink sheet. The peeling roller 47 and the ink sheet guide roller 48 guide the ink sheet. Peeling roller
The ink sheet guide roller 47 and the ink sheet guide roller 48 are attached to the thermal head 21 by a roller holder 49 and move up and down with respect to the platen 42 with the head rotating shaft 20 as a fulcrum together with the thermal head 21. The ink sheet 31 is supplied from the supply reel 32 and wound by the take-up reel 33. FIG. 2 is a schematic configuration diagram of gears and pulleys of the ink sheet conveying portion. In the figure, 51 is an ink sheet conveyance motor. Reference numeral 52 is a take-up pulley, 53 is a supply pulley, and both pulleys are rotated by an ink sheet conveyance motor 51 via a timing belt 54. This take-up pulley 52 has
A take-up pinion gear 55 having a built-in one-way clutch that locks when is rotated in the direction of arrow E is coaxially attached. 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. Reference numeral 57 denotes a reel gear, which is attached to both the winding side and the supply side, and is rotated by the winding pinion gear 55 and the supply pinion gear 56, respectively. 3 is a top view of FIG. 2, the torque plate 61 to which the felt 61a is attached in FIG. 3 is pressed against the reel gear 57 by the torque generating spring 63 via the transmission plate 62. 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. A take-up element 66 is attached to the tip of the reel shaft 65, and the take-up element 66 allows the supply reel 32 and the take-up reel 33 shown in FIG.
Is rotated.

 Next, the operation will be described.

FIG. 4 is an enlarged view of the recording portion of FIG. 1. In FIG. 4, the first color ink sheet 31 (eg, yellow) and the recording paper 41 are recorded between the thermal head 21 and the platen 42. When the capstan roller 43 is rotated in the direction of arrow I while being sandwiched by the pressure required for
It rotates in the direction of arrow M due to the frictional force with 41. The ink on the ink sheet 31 is transferred by the thermal head 21 which is heated by the recording signal to the recording paper 41 which is being conveyed in this way, and an image is formed from the middle part of the recording paper 41 toward the leading end. To do. Then, the transferred recording paper and ink sheet are peeled off by the peeling roller 47. When the recording is completed and the recording paper is separated from the platen and conveyed to the peeling roller, the conveying speed is configured to be substantially the same as the conveying speed at the time of recording, the entire screen is peeled under the same peeling condition, and melt-transferred at the time of recording. It is possible to obtain a good image in which the cooling time of ink is constant throughout the screen and the image quality is not deteriorated due to the difference in cooling time.

The operation of the ink sheet 31 at this time will be described with reference to FIG. 2. In FIG. 2, when the ink sheet transport motor 51 rotates in the direction of arrow C, the take-up pulley 52
Rotates in the direction of arrow E, and the supply pulley 53 rotates in the direction of arrow H. At this time, the take-up pinion gear 55 enters the locked state as described above and rotates together with the take-up pulley 52 to transmit the rotational force to the reel gear 57 on the take-up side, and the reel gear 57 on the take-up side rotates in the arrow K direction. On the other hand, the supply pinion gear 56 is in the free state as described above, and the rotational force is not transmitted to the reel gear 57. Therefore, the take-up reel 33 shown in FIG. 1 rotates in the direction of arrow K and the ink sheet
Take up 31. FIG. 5 is a diagram showing a state in which recording for one screen is completed. As shown in FIG. 5, when the trailing edge of the recording paper 41 passes over the peeling roller 47 and peeling off from the ink sheet is completed, as shown in FIG. The pusher release arm 25 pushes up the push release plate 22 to prevent the pusher 23 from moving away from the thermal head 21 and the platen 42.
The load applied to is only the own weight of the holding member with the thermal head 21. Hereinafter, this state will be referred to as a weak pressure state, and a 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 direction opposite to the conveying direction at the time of recording. To do.
The operation of the ink sheet 31 at this time will be described with reference to FIG.
By rotating in the direction, the take-up pulley 52 rotates in the arrow F direction and the supply pulley 53 rotates in the arrow G direction. At this time, the winding pinion gear 55 is in a free state, and no rotational force is transmitted to the reel gear 57 on the winding side.
Further, the supply pinion gear 56 is in a locked state and transmits a rotational force to the reel gear 57 on the supply side, and the reel gear 57 on the supply side rotates in the arrow L direction. Therefore, the supply reel 32 shown in FIG. 1 rotates in the direction of arrow L, and the ink sheet 31 is conveyed in the direction opposite to the conveying direction at the time of recording. Therefore, this ink sheet reverses the recording paper 41. It will play the role of a guide when carrying in the direction. And recording paper 4
Is guided to the upper part of the platen 42 along the ink sheet 31, and when it reaches the contact position between the thermal head 21 and the platen, it is sandwiched between the platen and the ink sheet 31 and moves toward the reverse feeding capstan roller 45. When the recording paper 41 image is conveyed backward to the capstan roller 45, the thermal head 21 and the ink sheet 31 are separated from the platen 42 by the head release arm 26 as shown in FIG.
The recording paper 41 is further conveyed, and when the recording start position of the first color reaches the heat generation position of the thermal head, the rotation of the capstan roller 43 is stopped and the conveyance of the recording paper 41 is stopped. When the recording paper 41 is conveyed in the direction opposite to the recording direction, as described above, the platen 42 is directly connected to the capstan roller 43 via the one-way clutch and the torque limiter, so that the platen 42 and the capstan roller 43 are not connected to each other. The tension is stably applied, and the recording paper 41 is conveyed without causing skew or slack. During this time,
The ink sheet 31 operates in the same way as recording paper, and the take-up reel
In 33, the second color is wound up and stopped until it reaches the heat generation position of the thermal head 21. After that, the thermal head 21 is pressed against the platen 42 again, and the state shown in FIG.
Recording of a color (for example, magenta) is performed. This series of operations is sequentially performed up to the third color (for example, cyan) to obtain a color image, characters, etc. After that, the recording paper is cut into a predetermined length by the cutter 50 and discharged. In the present invention, the recording paper is conveyed at a speed substantially higher than the conveying speed at the time of recording and the conveying speed at the time of recording when the recording paper is conveyed from the platen to the peeling roller. Can obtain good coupler images, characters, etc., and the recording time can be shortened by increasing the transport speed when the recording paper is transported from the platen to the peeling roller.

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

As described above, according to the present invention, by using the ink sheet as a guide for feeding the recording paper, the recording paper can be guided again to the position of the print head even if the recording paper is removed from the print head. , Full screen recording is possible. Further, at that time, the above operation can be performed more easily by transporting the ink sheet in the direction opposite to the transport direction of the recording paper. In addition, the pressure of the thermal head can be switched between strong and weak,
Furthermore, by configuring a one-way clutch with different locking directions in the ink sheet transport section, it is possible to transport the ink sheet in the forward and reverse directions with one motor, giving an extra load to the ink sheet transport motor and recording paper transport motor. Without it, the recording paper separated from the platen can be stably conveyed, and its industrial effect is great.

[Brief description of drawings]

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 configuration diagram of an ink sheet conveying portion of a recording apparatus in one embodiment, FIG. 4 is a schematic configuration diagram showing a recording state of the recording apparatus in one embodiment of the present invention, and FIG. 5 is recording in an embodiment of the present invention. FIG. 6 is a schematic configuration diagram showing a recording peeling state of the apparatus, FIG. 6 is a schematic configuration diagram showing a first reverse feeding start state in which the thermal head pressure of the recording apparatus in one embodiment of the present invention is weak pressure, and FIG. FIG. 8 is a schematic configuration diagram showing a second reverse feeding state in which the thermal head and the ink sheet of the recording apparatus in one embodiment of the present invention are separated from the platen, and FIG. 8 is a schematic configuration diagram showing a recording state of the recording apparatus in the conventional example. , 9th
FIG. 10 is a schematic configuration diagram showing a recording end state of the recording apparatus in the conventional example, FIG. 10 is a schematic configuration diagram showing a reverse feeding start state of the recording apparatus in the conventional example, and FIG. 11 is a reverse feeding state of the recording apparatus in the conventional example. It is a schematic block diagram which shows. 21 …… Thermal head 31 …… Ink sheet 41 …… Recording paper 42 …… Platen 47 …… Peeling roller

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B41J 17/02

Claims (7)

[Claims] 1. A print head having a plurality of printing elements for selectively performing a printing operation according to an input recording signal, an ink sheet transporting means for transporting an ink sheet, and a recording wound in a roll shape. It has a platen that sandwiches the paper and ink sheet between the print head and the recording paper conveying means that feeds the recording paper forward and backward, and prints from the mid-part of the recording paper to the leading end, and finishes the printing. After that, further convey the recording paper in the same direction until it comes off the print head,
After that, the front end of the recording sheet is brought into contact with the ink sheet, the recording sheet is conveyed in a direction opposite to the conveying direction at the time of printing, and the recording sheet is guided to the position of the print head using the ink sheet as a guide. Recording device. 2. An ink sheet conveying means is arranged coaxially with a supply-side reel for supplying an unused ink sheet, a take-up reel for winding a used ink sheet, and each reel. A supply-side torque limiter and a winding-side torque limiter whose locking directions are different from each other,
The recording apparatus according to claim 1, further comprising: an ink sheet transport motor that drives the supply-side reel and the winding-side reel via each of the two torque limiters. 3. The platen is configured so as not to generate a driving force when rotating during recording, but to generate a driving force when rotating in a direction opposite to a rotating direction during recording. The recording apparatus according to the first section. 4. The recording apparatus according to claim 1, wherein the print head is a thermal head having a plurality of heating resistance elements that generate heat according to an input recording signal. 5. The ink sheet conveying means is configured to forward and reverse the ink sheet, and the leading edge of the recording sheet is in a direction opposite to that at the time of recording when the recording sheet is not sandwiched by the thermal head and the platen. The recording apparatus according to claim 1, wherein the recording sheet is guided between the thermal head and the platen by the ink sheet being conveyed. 6. The recording apparatus according to claim 5, wherein the recording paper is guided between the thermal head and the platen while the thermal head is in contact with the platen via the ink sheet. . 7. The pressing force of the thermal head can be switched between at least two levels, strong and weak, when recording is performed on the recording sheet, the recording sheet is in a strong pressure state, and the recording sheet is conveyed in a direction opposite to the conveying direction at the time of recording. 7. The recording apparatus according to claim 6, wherein is set to a weak pressure state.