JPS63306452A - Feeding mechanism for sheet - Google Patents

Abstract

PURPOSE:To obtain a desired recording image by eliminating the superposition shift, etc., of a coloring sheet by bringing a friction roller which rotates at a constant speed into contact with the reverse surface of a photosensitive, pressure-sensitive recording sheet. CONSTITUTION:The friction roller 19 which rotates at the constant speed is allowed into contact with the reverse surface of the sheet which is unwound from an uncoiler 1 and the sheet 3 is pulled at the constant speed with the rotational frictional force of the friction roller 19. Then this simple constitution feeds the rolled photosensitive, pressure-sensitive recording sheet 3 at the constant speed at all times. Consequently, the distortion of an exposed image on a recording sheet surface and the shift in the superposition position from the coloring sheet 17 are evaded to obtain the desired recording image economically.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a sheet feeding mechanism.

[Prior art] Conventionally, a predetermined exposure process is applied to the surface of a photosensitive pressure-sensitive recording sheet,
For example, in JP-A-58, an image is realized on the surface of the color developer sheet by overlapping a color developer sheet and applying pressure.
This is already known from Publication No.-88740. By the way, in a device that embodies this technology, that is, an image output device, the light-sensitive and pressure-sensitive recording sheet is generally roll paper.
In addition, cut paper is often used as the developer sheet.
In this case, the feeding mechanism for the photosensitive and pressure sensitive recording sheet is to feed the recording sheet by the rotational traction force of a take-up roll for the recording sheet, or as another means, to feed the recording sheet by moving a set of both side edge surfaces of the photosensitive and pressure sensitive recording sheet. It was fed by sandwiching it between the feed rollers.

[Problems to be Solved by the Invention] However, in the former method using a winding roll, the winding diameter gradually changes as the photosensitive and pressure sensitive recording sheet is wound. There have been problems in that the feeding speed gradually decreases, causing distortion of the exposed image, and that the overlapping position of the exposed surface and the color developer sheet is misaligned, making it impossible to obtain the desired recorded image. In this case, it is also conceivable to control the rotational speed of the take-up roll according to changes in its take-up diameter, but in that case, a recording sheet feed speed sensor or a high-performance take-up roll drive motor may be used. On the other hand, in the latter method, which feeds the photosensitive and pressure-sensitive recording sheet by sandwiching both side edge surfaces of the sheet with a pair of feed rollers, the surface of the recording sheet is coated with a pressure-sensitive photosensitive agent. There is an economic waste in having to make the division recording sheet wider, and there is also a maintenance disadvantage in that cleaning of the photosensitive agent adhering to the feed roller is required. There was also.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and its purpose is to constantly print a roll paper-like photosensitive and pressure-sensitive recording sheet at a constant speed using a simple structure. Tll that made it possible to send! It provides R.

This avoids distortion of the exposed image on the surface of the recording sheet and misalignment of the overlapping position with the m-color sheet, thereby economically obtaining the desired recorded image.

[Means for Solving the Problems] In order to achieve this object, the sheet feeding mechanism according to the present invention includes a friction roller that rotates at a constant speed on the back side of the sheet uncoiled from the uncoiler. The gist is that the sheet is pulled at a constant speed by the rotational frictional force of the friction roller.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings. The photosensitive and pressure sensitive recording sheet 3 wound around the uncoiler 1 in the sheet cassette 2 is sent to the pressure fixing device 16 through the exposure section 5 between the guide rolls 4a and 4b, and then passed between the pair of pressure developing rollers 8a and 8b. After passing through, the winding roll 20
It is designed to be wound up. The original 6 is placed in the exposure section 5.
is set, and a fluorescent lamp 7 is placed directly below it. Also, the pressure roller 8a.

Backup rollers 9a and 9b are interposed in 8b, and the load shaft 10 of one of the backup rollers 9a is moored to a load lever 12 that is rotatable around a fulcrum 11, and a load adjustment lever that is engaged with the load lever 12. By adjusting the screw 13, load spring 14, and load stopper screw 15, the squeezing force and spacing between the repressure rollers 8a and 8b can be adjusted as appropriate. In this embodiment, the gap between the re-pressure rollers 8a and 8b is larger than the thickness of the photosensitive pressure-sensitive recording sheet 3 and the color developer sheet stored in the color developer sheet cassette 8. 17, and when the developing sheet 17 is not in the developing state, that is, when the developing sheet 17 is not being sent to the pressure fixing device 16, the pressure rollers 8a and 8 are placed on the surface of the photosensitive pressure sensitive sheet 3.
This is done so that the clamping force of b is not applied. Therefore, in the present invention, a friction roller 19 is provided on the back side of the photosensitive pressure sensitive sheet 3 after the photosensitive pressure sensitive sheet 3 passes through the pressure fixing device 16 until it is wound up on the take-up roll 20.
is attached. The friction roller 19 is made of a rubber roll with a large frictional resistance, and is connected to a drive source (not shown) so that it rotates at a constant speed.

Next, the operation of the image output device of this embodiment will be explained.

The original 6 is set on the exposure section 5. Then, by turning on the fluorescent lamp 7 and moving it to the right, the photosensitive pressure-sensitive sheet 3 is exposed. The exposed photosensitive pressure sensitive sheet 3 is pulled by the rotational friction force of the friction roll 19 and is moved to the pressure roller 8.
It is sent between a and 8b. On the other hand, the color developing sheet 17 is similarly sent between the repressing angle rollers 8a and 8b, and both sheets 3 and 1
Roll pressure is applied for the first time when 7 are stacked on top of each other,
The latent image on the photosensitive pressure sensitive sheet 3 appears on the color developer sheet 17. In this development stage, the sheet feeding speed is higher than the rotational friction force of the friction roller 19, and the positive force rollers 8a,
The speed is determined by the squeezing rotational force of 8b. Therefore, the friction roller 19 works to prevent the photosensitive pressure sensitive sheet 3 from sagging and to pull it before the color developer sheet 17 enters the pressure rollers 8a, 8b and after it leaves the pressure rollers 8a and 8b. Note that the winding roll 20 of the photosensitive and pressure sensitive sheet 3 only needs to be applied with horsepower and driving force capable of winding up the photosensitive and pressure sensitive sheet 3 pulled by the friction roller 19, and as long as the number of rotations on the driving side is secured. .

The present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit thereof. For example, although the heat fixing section is omitted in this embodiment, it may be added. Furthermore, although a fluorescent lamp is used for exposure, a tungsten lamp or the like may also be used. moreover,
In this embodiment, exposure is carried out by transmission contact, but a reflection imaging method, a transmission imaging method, etc. may also be used.

[Effects of the Invention] As is clear from the detailed description above, the present invention has a simple configuration in which a friction roller rotating at a constant speed is attached to the back side of the photosensitive and pressure sensitive recording sheet, and the photosensitive and pressure sensitive recording sheet is Because it realizes constant speed feeding of the pressure recording sheet,
By avoiding misalignment of the color developer sheet on the exposed surface, not only a desired recorded image can be obtained, but also production costs can be reduced.

[Brief explanation of the drawing]

The drawing is a schematic configuration diagram of an embodiment embodying the present invention. In the drawing, 1 is an uncoiler, 3 is a photosensitive pressure-sensitive recording sheet, 5 is an exposure section, 6 is an original, 7 is a fluorescent lamp, and 8a. 8b is a pressure developing roller, 16 is a pressure fixing device, 17 is a color developer sheet, 19 is a friction roller, and 20 is a take-up roll.

Claims (1)

[Claims] Sheet feeding characterized in that a friction roller rotating at a constant speed is attached to the back side of the sheet uncoiled from the uncoiler, and the sheet is pulled by the rotational frictional force of the friction roller. mechanism.