JPS6056766A - Sheet stacker - Google Patents

Abstract

PURPOSE:To stack sheets of paper in a neat and good state, by bringing rotary blades into contact with the rear edge of the stacked sheet of paper to push the sheet on a stacking tray and place the rear edge of the sheet in contact with the side plate of the tray. CONSTITUTION:Even if a sheet 7' of paper is pinched and discharged by paper discharge rollers 1 and push rollers 3 as the rear portion of the sheet is curved, the rear edge of the sheet is pushed toward the bottom of a stacking tray 6 by soft rotary blades 5 turning together with the paper discharge rollers. Since the blades 5 are turning, the rear edge of the sheet 7' is pushed to the notches 6a of the stacking tray 6 so that the sheet of paper is stacked in a good state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet collecting device such as an automatic collating machine that is connected to a copying machine, a printing machine, a recording machine, or these devices and collates sheet materials.

This type of equipment is being made smaller and simpler. For example, in copying machines, the diameter of the roller in the fixing unit that heats the powder image on the sheet paper is reduced, and small diameter rollers are used. By increasing the contact pressure between the pair and increasing the temperature of the fixing roller, the unit structure is made smaller and the overall structure of the copying machine is made smaller.

However, by reducing the diameter of the fixing roller, the copy paper passing between the rollers tends to be curved and discharged following the shape of the rollers. On the other hand, the stacking device (hereinafter referred to as a stacking tray) that collects the copy paper that is ejected in a curved manner must also be made smaller so that it can properly collect the curved copy paper. First, the number of items collected is limited. Alternatively, there is a problem that the collection tray must be made larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet stacking device that stacks sheet paper in a good condition even when the sheet paper is discharged in a curved manner.

The present invention is a sheet stacking device that includes a paper ejection roller that ejects a sheet member and collects the sheets ejected by the paper ejection roller, in which a rotating blade member that can come into contact with the rear end of the sheet is fixed. be.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a storage device of a copying machine according to an embodiment to which the present invention is applicable. In the figure, l is a paper ejection roller that ejects a sheet of paper, and λ is a paper ejection roller shaft, which is driven and rotated by another drive system (not shown) in the main body of the copying machine.

Reference numeral 3 denotes a presser roller, one end of which is rotatably fixed to a shaft provided at the other end of a spring member ring fixed to the machine frame, and is biased to press against the paper ejection roller. Follow.

The rotating blade 5 is made of a flexible material such as urethane rubber, is fixed to the paper ejection roller shaft in the middle of the paper ejection roller 1, and rotates together with the paper ejection roller. A collection tray 6 for collecting discharged sheet paper is used to collect the collected sheet paper 7.
A notch 6a is provided at the paper ejection roller/side end of the collection tray 6 so that the rotating blade 5 can come into contact with the paper discharge roller.

The sheet paper 7 is ejected while being pinched by the paper ejection roller/and the presser roller 3, and falls onto the collection tray B. The left rotary blade rotates together with the paper ejection roller, so it presses the rear end of the ejected torn sheet paper 7 onto the collection tray 6, and also presses the rear end of the sheet paper 7 that has been ejected onto the collection tray 6.
Rotate so as to pull it towards the a side. It comes into contact with the back side of the sheet paper 7 being ejected in front of it, but since it is made of a flexible material, it does not damage the sheet paper and there is no problem during ejection. Even if the sheet paper 7 is discharged with its rear end curved, it is pressed against the bottom of the collection tray 6 by the rotating blades j, and the sheet paper 7 is collected in a good $3 condition.

FIG. 2 is a front view of another embodiment of the rotating blade. In the above embodiment, the case where there are seven rotary blades S is described, but
As shown in Fig. 2, in order to obtain a better effect, a plurality of blades (in the figure, a rotating blade 5a) is used.

It may be composed of three blades, 3b and 3sc.

FIG. 3 is a side view showing still another embodiment.

A gear g attached to the end of the discharge roller shaft y meshes with a gear 10 attached to the end of the shaft l/ to which the rotary blade S is fixed via an intermediate gear t.

The distance between the shaft l/ that fixes the rotary vane 9 and the discharge roller shaft is determined so that the rotary vane S does not interfere with the shaft 2,
The gear ratio between the gear λ and the gear 10 is selected such that the rotational speed is such that the rotating blade 3 does not come into contact with the discharged paper sheet I and damage the paper sheet. The intermediate gear is gear - and 70
It is sufficient that they mesh with each other, so you can choose an appropriate size.

In addition, in FIG. 3, the axis // to which the rotary blade S is fixed may not be parallel to the paper ejection roller axis 1, or may be a plurality of axes.

As explained above, in a sheet stacking device such as an electrophotographic copying machine that collects sheet paper, by providing a rotary blade that can come into contact with the rear end of the stacked sheet paper, it is possible to The sheet paper is pressed down, the rear end of the sheet paper is brought into contact with the side plate of the collection tray, and the sheet paper is stacked in an orderly manner.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a front view showing another embodiment, and FIG. 3 is a side view showing another embodiment. L... Paper discharge roller C... Paper discharge roller shaft S... Rotating vane B... Collection tray 4a... Notch 7, 7'-- Sheet paper Z, 10-- Gear W... Intermediate gear //...・
shaft. Patent Applicant Canon Co., Ltd. Agent Arai-be

Claims (1)

[Claims] / A flexible rotary blade that presses the edge of the sheet paper collected on a collection tray in a sheet collection device that is equipped with a paper ejection roller that ejects sheet members and collects the sheets ejected by the paper ejection roller. A sheet storage device characterized by comprising a member.