JPS6113472Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brake device for roll paper for copying such as roll photosensitive paper and roll paper for transfer.

When using roll paper as copy paper, when the paper is pulled out of the roll, the inertia caused by the pull-out causes the roll paper to sag.
In order to prevent this sag, conventionally, a friction pad is pressed against the circumferential surface of the roll paper, and the rotation of the roll paper is stopped as soon as the paper is pulled out from the roll paper. .
A conventional brake friction pad that is brought into pressure contact with the circumferential surface of a roll paper is located at the center of the roll paper in the width direction.

Therefore, when a rolled paper is used with the image forming surface facing outward for electrophotography, scratches caused by the brake friction pads occur on the image forming surface, which hinders image formation. Especially when roll photosensitive paper is used as an offset master, even if no image is formed in the scratched area, that is, even if there is a scratch on the non-image area of the offset master, the scratched area will be removed. Since the printing ink adheres to the paper, printing with background smudges will be performed. Furthermore, when a transfer-type electrophotographic copying machine is used to transfer images onto plain paper other than photosensitive paper, there is a risk that uneven transfer may occur at scratched areas.

This invention is aimed at solving the problems of conventional brake devices, and is characterized by the provision of friction pads that press against at least the side edges of the roll paper.

The present invention will be explained below with reference to illustrated embodiments. In the case of photosensitive paper, the image forming surface, that is, a rolled paper 1 with the photosensitive surface on the outside, is rotatably supported on one side of the copying machine by an appropriate roll paper support device well known in the art. The outer end 1a is pulled out by a pair of paper feed rollers 2, and cut into a predetermined length by a paper cutting device 3 for use. Note that explanations of the devices necessary for copying after the paper-cutting device 3, such as a charging device, an exposure device, a developing device, etc., will be omitted.

A lid 4, which is opened and closed when loading roll paper into the copying machine, has its base end supported by a shaft 5 on the copying machine body so as to be openable and closable, and a brake device 16 is provided below the lid. There is.

A base 7a of a swinging member 7 is pivotally attached to a lug 6a fixed to a stationary member 6 of the copying machine by a shaft 8. On both sides of the free end of this swinging member 7, there are friction pad attachment members 9 (only one of which is shown in a perspective view in FIG. 3) that is slidable in the direction of pressing against the side edge of the roll paper. It is attached using an elongated hole 10 provided in and two headed screws 11 and 12. The friction pad attachment member 9 has a friction pad 13 on the inside of its base that generates an appropriate frictional force between it and the side edge of the roll paper.
is fixed. When the bent piece 9a of the pad attachment member 9 is brought into contact with the end surface of the roll paper 1, as shown in FIG.
It is located at the edge 1a on the side end side of the roll paper 1.

To set the folding piece 9a in a position where it is in contact with the end surface of the roll paper depending on the width of the roll paper to be used, with the lid 4 open, loosen the screw 12 and move the pad mounting member 9 to the swinging member. 7 to position the pad mounting member 9, and then tighten the screw 12. Alternatively, the pads are positioned by matching the markings provided on the pad attachment member 9 with the width indications of the copy paper written on the swinging member 7, such as "A" and "B". The slidable pad mounting member 9 is used to determine the position of the friction pad 13 according to the width of the roll paper, so if a roll paper of a constant width is always used, it can be attached directly to the swinging member 7. The friction pad 13 can be fixed.

In order to use the friction pad 13 as a means for applying braking force to the roll paper 1, it is possible to use the weight of the brake device, suspend a weight from the free end of the swinging member 7, or attach a spring to the swinging member 7. However, in this embodiment, the friction pad 13 is moved against the roll paper 1 by the weight of the brake device.
A means for pressing the side edge of the plate is employed.

The friction pad of the present invention allows the size of the roll paper to be identified simply by bringing it into contact with the side edge of the roll paper, so there is no need for a special roll paper size display means.

According to the present invention, even if the contact area between the friction pads 13 and the roll paper is narrowed, sufficient frictional force can be obtained because the roll paper bites between the pads. In addition, since the friction pad is pressed against the edge of the side edge of the roll paper, the lifting of the roll paper that may occur when pressing the side edge of the roll paper is avoided by directing the friction pad toward the center of the roll paper. This can be suppressed by the displacement habit.

Therefore, according to this invention, it is possible to completely eliminate background stains on copies caused by the brake device, and there is also the effect that there is no need for a special means for displaying the size of the currently loaded roll paper. It will be done.

[Brief explanation of the drawing]

Figure 1 is a cross section showing one embodiment of the present invention;
The figure is a view of FIG. 1 seen from the direction of arrow A, and FIG. 3 is a perspective view showing a part of FIG. 1. 1... Roll paper.

Claims (1)

[Scope of utility model registration request] 1. A braking device for a roll paper for copying, characterized in that a friction pad is provided which presses against the roll paper loaded in a copying machine from at least a side edge thereof, with a tendency to move toward the center of the roll paper.