JPS60137743A - Conveyor - Google Patents

Abstract

PURPOSE:To properly transfer an image, by using a conveyance means to move a transfer material back and forth between a transfer section and a positioning means, and using the positioning means to shift the position of the transfer material to surely prevent the deviation of the overlaid transfer position of the material. CONSTITUTION:After the inclination of paper P is adjusted by a positioning means 20, the paper is conveyed to a transfer section 13 by a pair of conveyance rollers (conveyance means) 17, 18 through the action of a platen roller 11 and a pinch roller 14 so that printing is performed on the paper at the transfer section. After that, a thermal head 12 is lowered, and the platen roller 11 and the conveyance rollers 17, 18 are reversed to convey the paper P to the positioning means 20 so that a sensor 19 detects the front edge of the paper. When the front edge of the paper P is moved away from the sensor 19 toward the positioning means 20, the platen roller 11 and the conveyance rollers 17, 18 are stopped, and the conveyance rollers are separated from each other. The inclination of the paper P is adjusted again by the positioning means 20 so that next printing is performed, without deviation, in an overlaid state on the former printing. An image is thus transferred properly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper conveyance device for use in, for example, thermal transfer color printers, color copiers, color copying machines, etc., which perform one-time printing by conveying paper back and forth.

[Technical background of the invention and its ij4 issues] With this glaze equipment, the paper may meander during reciprocating transport, but in order to prevent this, the paper P is Two pinch rollers 2 follow the platen roller 1.

2 and the platen roller 1, and the method of conveying the material while being wound around the platen roller 1 having an elastic layer such as rubber on the surface is well known. In this case, the pressure of the pinch rollers 2, 2 and the platen roller 10'' must be equally distributed in the longitudinal direction at a (pressure per unit length) as shown in the figure. If a pressure drop occurs, the amount of deformation of the elastic layer will be different due to the pressure difference.9 As a result, there will be a difference in the paper conveyance distance on both sides.1 - The paper P will meander, causing misalignment of overlapping printing. I'm smiling.

However, the platen roller 1 and the pinch roller 2,
It was difficult to match the pressure in the longitudinal direction between the two parts with precise accuracy, and the precision of the parts was high, making it impossible to create a structure with a large number of parts, a gag dam, a compact fuselage, and lower costs.

As shown in FIGS. 2 and 3, the leading edge of the paper P is connected to the platen roller 1 and the thermal head roller 2-1. Distance at <1. +α) could not be printed, and at the rear end of the paper P, a portion corresponding to the sum ('2+d+13) of the distance from the printing point (A) to the separation point B of the thermal transfer paper 4 and the paper P could not be printed. That's it. For example, for A4 size paper P, the total length is 297-, but the leading edge PI is 25.
7nyILX rear end P3 cannot print about 45mm,
Therefore, there is an inconvenience that the printing range P2 becomes very short, about 227πm.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to achieve a ratio of 1p? It is an object of the present invention to provide a conveyance device which has a simple structure but can prevent the transfer material from swiping.

[Invention planting]

To achieve the above object, the present invention includes a conveyance means for conveying a material to be transferred, and an alignment device provided near the conveyance means for aligning the material to be transferred in a direction corresponding to the conveyance direction. means for conveying the material to the to-be-rolled material through the conveying means;
1: Transfer part and front H [.

By reciprocating between the alignment means and the alignment means, the transferred material h11 is aligned.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the example shown in FIGS. 4 to 8. In the figure, reference numeral 11 denotes a platen roller, and a thermal head 12 as a recording head is brought into contact with and separated from the platen roller 11. The pressure contact portion between the thermal head 12 and the platen roller 11 is a transfer portion 13, and a pin fo roller 14 is provided on the paper ejection side bordering the transfer portion 13.
is in rolling contact with the platen roller 11. An ink ribbon 15 is interposed between the platen roller 11 and the thermal head 12, and the ink ribbon 15 is guided and run by a pair of guide rollers 16 and 16. On the other hand, a pair of feed rollers 17 and 1B as a conveyance means and an alignment means 20 are arranged on the supply side of the paper P as a transfer material to the transfer section 13. The pair of feed rollers 18 and 19 are provided so as to be able to move toward and away from each other, and are configured to rotate forward and backward. Further, a detection sensor 19 is provided between the pair of feed rollers 1B, 19 and the platen roller 11, and this detection sensor 19 detects the leading and trailing ends of the sheet P. When this detection sensor 19 detects the leading and trailing ends of the paper P, it gives an operation command to the side 1tIII sources (not shown) of the pair of feed rollers 17 and 18. Further, when the feed rollers 18, 19 are rotated, the number of rotations is counted by a counter (not shown), and the distance t4tt in which the sheet P is fed by the feed rollers 18, 19 is controlled. That is, the paper P is reciprocated between the printing 1°', 1113 and the aligning means 20 via the feed rollers 1g and 19, and during this reciprocation, the entire paper P is moved 11 degrees to the transfer section. It is designed to pass through 13.

Further, the alignment means 20 includes (plate 21 and this substrate 21
The substrate 20 has an alignment reference plate 22 provided on one side thereof, and a pushing plate 23 movable in a direction perpendicular to the conveyance direction of the paper P on the other side of the substrate 20. Said push 11
．． The plate 23 is rotatably connected to the pusher 11+1124 via a rotating shaft 25, and has a degree of freedom in the direction of arrow D-D71. The push shaft 24 is forced by a drive source (not shown) to move forward and backward.

At the time of transfer, the inclination of the paper P is aligned by the alignment VR means 20 "ij". That is, as shown in FIG. 8, the push shaft of the alignment hand 20 is moved forward in the direction of mark a, and its push plate 23 is tilted as shown by the two-dot chain line C'. Press one end of the paper P to move it, and bring the other end into contact with the alignment reference plate 21. By doing this, the paper P is aligned with the alignment reference plate 21. As a result, the slope will be corrected.

After the alignment operation is completed in this way, as shown in FIG. The leading edge of the paper P is once aligned using the sensor 19, and the paper P is conveyed while counting the rotational speed of the feed roller 17.1B to determine the exact water distance from the detection sensor 19 to the transfer unit 13. Thereafter, the paper P is conveyed and entirely passed by the platen roller 11 and the pinch roller 14 driven by the platen roller 11 while being printed by the transfer section 13 .

-1: After printing is completed, as shown in FIG. 6, the thermal head 12 is lowered, the siratin roller 11 and the feed rollers 17, 1B are rotated in the opposite direction to the printing direction, and the paper P is aligned with the alignment means 2o1. While conveying, the leading edge of the paper P is detected again by the detection sensor ν19, and when the leading edge of the paper P moves a little away from the detection sensor 19 in the direction of the alignment means 20, the rotation of the platen roller 11 and the feed rollers 17 and 18 is stopped. ,
After the paper P is made to stand still, a gap is provided between the feed rollers 17 and 18, and the paper P is aligned again in the state shown in FIG. 4 to perform overlapping printing.

With the above configuration, it is possible to print on the entire surface of the paper P, and the paper P is aligned every - times printing (7. The detection sensor 19 adjusts the paper position, so printing is always in the same state. υ() should be started, there will be no accumulation of skis during paper transport, and there will be no misalignment of the overlapped printing position in overlapping printing.
6(L) It is actually preventable.

〔Effect of the invention〕

As explained above, in the present invention, during copying, the material to be transferred is reciprocated between the transfer section and the aligning means via the conveying means, and the transferred material is aligned by the aligning means. Therefore, it is possible to reliably prevent displacement of the off-line transfer position and achieve good image transfer.

[Brief explanation of drawings]

11th C: <Figures 1 to 3 are explanatory diagrams showing conventional examples, and Figures 4 to 3 are explanatory diagrams showing conventional examples.
8th Ifd shows one embodiment of the present invention, and FIGS.
FIG. 6 is an explanatory view showing the operation during overlapping transfer, FIG. 7 is a plan view showing the aligning means, and FIG. 8 is an explanatory view showing the operating state thereof. 11...Platen, 12...Recording head (thermal head), P...Transferring material (paper), 17°18...
- Conveying means (feeding roller), 20... alignment means. 11 JI at the helm! Human Ra “Buried Earth Suzue Takehiko 1st
Figure 2 Figure 3-11 Color 6 Figure

Claims (3)

[Claims] (1) In a device that transfers images overlappingly by conveying a transfer material back and forth to a transfer section where a platen and a recording head are in pressure contact, a transfer means for conveying the transfer material, and a transfer means provided near the conveyance means are provided. an alignment means for aligning the transferred material in a direction perpendicular to the conveyance direction thereof, and the transfer material is reciprocated between the transfer section and the alignment means via the conveyance means to align the transferred material. A conveying device characterized in that the material to be transferred is aligned by a positioning means. (2) The conveyance device according to claim 1, wherein the transfer material is aligned every time it is reciprocated. (3) The conveyance device according to the first or second aspect of the patent, characterized in that the conveyance direction of the transferred material is detected between the conveyance means and the alignment means.