JPS623729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a feeding device for rolled recording paper.

Conventionally, to supply recording paper to electrostatic recording devices such as copying machines and facsimile machines, a roll of recording paper (hereinafter referred to as "roll paper") is fed to a predetermined position.
A method of cutting and supplying the material at a predetermined position is used.

FIG. 1 is a schematic diagram of a conventional electrostatic recording device such as a copying machine or a facsimile machine that uses the roll paper recording supply system, in which 1 is the roll paper, 2 is the roll paper curl removal roller, and 3 and 6 are the roll paper curl removal rollers. A roll paper feeding drive roller mechanism, 4 is a back roller, and 5 is a stylus. This stylus 5 forms a latent image on electrostatic recording paper. 7 is a cutter for cutting the roll paper into a predetermined size, 8 and 11 are recording paper feed drive rollers, 9 is a switch for switching between normal feeding of recording paper and removal of unnecessary recording pieces, and 10 is a cutter for cutting the roll paper into a predetermined size. 12 is a developing device, 13 is a fan, 14 is a fixing device, and 15 is a tray.

In the recording paper supply system using roll paper as shown in FIG. There is a problem that paper jams occur frequently within the printer, and the resulting copies are curled. To solve this problem, a curl removal roller is also provided in the example shown in FIG. Typical other curl removal methods that have been proposed in the past include methods that remove curls by passing the paper between multiple rollers, or methods that remove curls by bringing the paper into contact with two rollers with different hardness and passing the paper between them. There are methods that remove curls by rolling the paper, but none of these methods can completely remove the curls at the leading edge of the recording paper, and the leading edge of the roll paper comes into contact with various parts of the device, causing jams. In addition, stains on the back of the recording paper, toner smearing, wrinkles, etc. occur when the recording paper is transported to processes such as the developing section and the fixing section.

An object of the present invention is to provide a roll paper feeding device that solves the above problems.

The present invention is particularly characterized by providing a mechanism for removing curls from the leading edge of the roll paper (hereinafter referred to as "decurling"), and setting the decurling mechanism just before the leading edge of the roll paper is gripped by a pair of rollers. The present invention is equipped with a roll paper feeding mechanism that resets the leading edge of the roll paper when it is decurled and resumes the normal paper feeding function.

Hereinafter, the present invention will be explained in detail with reference to Examples.

In addition, in all the figures, parts having the same function are given the same symbols.

FIGS. 2 and 3 are diagrams illustrating the configuration and operation of an embodiment of the present invention.

In the figure, 6A and 6B correspond to the roller pair of the roll paper feed drive roller mechanism 6 in the example of FIG. 1, 6A is a drive roller, and 6B is a driven roller. The driven roller 6B is pressed against the drive roller 6A by a pressure spring 17 provided on its rotatable shaft member 16. Further, the peripheral surface member 18 of the driven roller 6B is rotatably attached to the peripheral surface of the shaft member 16 via a bearing 19 to follow the driving roller 6A. Reference numeral 21 denotes a concave surface 2 that protrudes from the peripheral surface of the peripheral surface member 18.
0, and the shaft member 16
Either integrally formed with or separately attached. The concave surface has a shape that fits into a portion of the opposing roller (drive roller 6A).

In this embodiment, as shown in FIG. 2, bearings are provided at multiple locations to rotatably support only the peripheral surface member 18 of the driven roller 6B. Depending on the hardness, bearings 19 may be provided only at both ends of the driven roller 6B to support it rotatably.

Next, the operation of this embodiment will be explained.

Assume now that a roll paper 1 having a curl such that its upper surface is convex is being passed as shown in FIG. 3a. The driving roller 6A is rotated (the driven roller 6B is also rotated), and when the leading edge of the roll paper 1 comes just in front of the pair of rollers, the shaft member 16 is rotated in the direction of the dotted line arrow in synchronization with the position and timing. As shown in Figure 3b, the decal member 2
From the concave surface 20 of 1 and the drive roller 6A, the roll paper 1
The leading end of the roller is forced to have its upper surface concave, so that the roll paper that passes through the roller section is decurled, as shown in FIG. 3c. Note that in the case of roll paper with weak curl, it curls slightly, but this does not cause any problem when the paper is passed through.

FIGS. 4 and 5 are diagrams illustrating the configuration and operation of another embodiment of the present invention. In this embodiment, by separating the roller pair in the embodiment shown in FIG. 2, the shaft member 1 of the driven roller 6B is
A rotary shaft 16' is provided eccentrically with respect to the central axis of 6. With this configuration, when the leading end of the roll paper is gripped, the roller pair separates and
Since only the driving roller 6A and the decurling member 21 are in contact with each other, it is easy to grip the leading end of the roll paper (see FIG. 5b). The other operations are almost the same as those in the embodiment shown in FIG. 2, and therefore will not be described here.

In the above embodiment, the driven roller is arranged on the lower surface side of the roll paper, but it may be arranged on the upper surface side if necessary.

As explained above, according to the present invention, it is possible to decurl the curl that occurs at the leading end of the roll paper when it passes through the drive roller section, so that the curl that occurs at the leading end of the roll paper can be decurled when passing through each process section. Problems such as paper jams, dirt on the back of recording paper, toner drop, wrinkles, etc. can be removed. Furthermore, the entire recording paper supply device can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional electrostatic recording device such as a copying machine or a facsimile machine that uses a recording paper supply system using roll paper, and FIGS. 2 and 3 illustrate the configuration and operation of an embodiment of the present invention. 4 and 5 are diagrams illustrating the configuration and operation of other embodiments of the present invention. 6A... Drive roller, 6B... Followed roller, 16...
Shaft member, 16'...Eccentric rotating shaft, 17...Spring, 18...Surrounding member, 19...Bearing, 20...
Concave surface of decal member, 21... Decal member.

Claims (1)

[Claims] 1. In a roll paper supply device equipped with a roll paper feeding mechanism consisting of at least a pair of rollers, one of the rollers is composed of a rotatable shaft member and a peripheral surface member rotatably disposed on the peripheral surface of the shaft member. and a decurling member having a concave surface protruding from the surface of the circumferential member and fitting with a part of the surface of the other opposing roller is provided on at least a part of the shaft member to remove curls at the leading end of the roll paper. A roll paper feeding device characterized by: