JPS63267624A - Intermediate tray of duplicating machine and the like - Google Patents

Abstract

PURPOSE:To stack papers uniformly with the front end adjusted to the basic surface by providing a switchover guidance mechanism, that can select the feeding position of the paper on the downstream of the feeding direction of a sending-in mechanism. CONSTITUTION:A smaller size paper discharged from a set of discharge rollers 13, 14 passes through the top side of a switchover gate 33 and its end reaches accurately a front plate 8 as being conveyed with a pair of supplementary conveyor roller 32 holding the paper in between. At this point, the rear end of the paper already being apart from the pair of the supplementary conveyor roller 32, the paper falls between both side plates 18, 27 of a tray 4. On the another hand, is the case of larger size papers, it passes through the underside of the switchover gate 33 by the switchover gate being switchable to the position of a broken line. Consequently, when the front end of the paper reaches and stops at the front plate 8, no inconvenience will occur that the paper will not fall on the tray 4 because the rear end of the paper is held between the pair of supplementary conveyor roller 32.

Description

[Detailed Description of the Invention] This invention relates to an intermediate tray of a copying machine, etc., which accepts paper that has been subjected to one-sided copying, aligns the paper in a predetermined position, and refeeds the paper for back-side copying, etc. .

When performing double-sided copying or double-sided printing using a double-sided copying machine, double-sided printing machine, etc., the paper that has been copied or printed on one side is reversed, discharged onto the intermediate tray, stacked, and then the copy original is printed. Or, when replacing the plate and refeeding the paper, the paper is ejected one sheet at a time into the intermediate tray so that there is no misalignment or bending of the paper and the photoconductor or printing roll in the front, back, left, and right positions. must be stacked on the tray with the leading edge and reference side edges perfectly aligned in place.

For this purpose, conventional paper alignment devices for intermediate trays are equipped with, for example, a front abutment plate at the front end of the tray that serves as a reference surface for aligning the leading edges of the paper, and the reference side of the paper is brought into contact with the side. A reference side wall for aligning the edges is fixed to one side edge of the tray, and when paper is ejected onto the tray and scooked, the inner surface of the reference side wall aligns with the paper after separating the paper feed roller and the tray. The tray is moved laterally so as to be biased outward by an appropriate distance from the paper reference position, and the paper ejected onto the tray is slanted one by one using a sponge roller installed on the tray at an angle with the paper ejection direction. An apparatus is known in which paper is aligned and scooked by aligning the front edge and reference side edge of the paper by aligning the paper with the front plate and the reference side wall.

When refeeding the paper that has been scooked by this device for reverse side copying, the pressure means is used to push up the tray and press the top surface of the paper stack against the paper feed roller to apply paper feed pressure. The inclined sponge rollers are separated from the top surface of the paper, the drive of the rollers is stopped, and the tray is returned to the reference position before applying paper feed pressure so that the reference side of the stacked paper matches the paper passing reference. ing.

Since the above-described coordinated operations need to be performed in conjunction with each other, they have been performed using a single solenoid, a half-rotation spring clutch, a cam, and a link mechanism. As a result, the mechanism becomes complicated, many adjustment operations are required, and a great deal of time is required for assembly.Furthermore, the above-mentioned sponge roller impairs the operability of jam removal.

As shown in FIG. 2, the configuration of the intermediate tray that solves the above problems is as follows: As shown in FIG. 11° 12 and then the discharge roller pair 13.1
4, the paper is ejected upward from the horizontal direction, and the top surface of the paper is aligned with the arch-shaped ejection guide plate 15, and the leading edge of the paper is placed on the front plate 8, which has a reference surface that aligns the leading edge of the paper stacked on the tray 4. Guide me towards the other side.

The movable side plate 18, which performs widthwise positioning by aligning both side edges of the paper, is provided at approximately the center of the tray 4 in the paper conveyance direction together with the reference side plate 27 shown in FIG.
As shown in the figure, it is sloped so that the top is wide open in the shape of a hopper, and the tip collides with the front plate 8 and stops advancing, and guides the side edge of the paper that falls onto the tray 4 by its own weight, and then the paper is placed on both sides. A conceivable configuration is that they land at alignment positions in the width direction determined by the lower vertical part of 18 degrees 27 degrees, and are stacked at predetermined positions on the tray 4.

Now, in the above configuration, the front edges of the sheets discharged from the discharge rollers 13 and 14 are aligned without coming into contact with the upper surface of the tray 4.

It must reach the front plate 8. In the case of long size paper, the ejection part is conveyed obliquely upward by the pair of ejection rollers 13 and 14 for quite a long time, so the front end reaches the front plate 8 along the ejection guide plate 15, which is unlikely to cause a problem. However, in the case of small-sized paper, the trailing edge of the paper may separate from the discharge rollers 13 and 14 quickly and may not follow the discharge guide plate 15 but along the upper surface of the double-sided tray 4.

In this case, due to friction or catching, the leading edge of the paper does not reach a position near the front plate or at least directly below the paper feed roller, making paper feeding impossible.

(1) One sheet Therefore, an object of the present invention is to provide an intermediate tray having a means for allowing the front end of the sheet to reach the front plate 8, regardless of the size of the sheet.

In order to achieve the above object, the present invention includes a carry-in mechanism that feeds sheets of paper that have been subjected to single-sided copying, etc., into a tray, and aligns the leading edges of the sheets fed by the carry-in mechanism to align the sheets. In an intermediate tray of a copying machine or the like having a paper leading edge alignment reference surface, a paper feeding position determined by the paper size and the position of the paper leading edge alignment reference surface is selected on the downstream side in the feeding direction of the carrying mechanism. It is characterized by being equipped with a switching guide mechanism.

EMBODIMENT OF THE INVENTION Below, one Example of this invention is described in detail based on one drawing.

FIG. 1 is a diagram showing the structure of an embodiment in which the present invention is applied to an intermediate tray having the structure explained in FIG.

In the intermediate tray of this embodiment, as shown in FIG. 1, a conveyance roller pair 32 is provided at an intermediate position of the discharge guide plate 15, and a switching gate 33 is provided between the roller pair 32 and the discharge roller pair 13. When accepting small-sized paper, the switching gate 33 is held at the position shown by the solid line, and when large-sized paper is accepted, it is controlled to be switched to the position shown by the broken line.

The distance between the pair of transport rollers 32 and the front abutment plate 8 that aligns the leading edge of the paper is determined depending on the size of the paper so that the leading edge of the paper fed by the pair of transport rollers can reach the front abutment plate 8 without touching the top surface of the tray. It is considered to be a reachable distance.

By doing this, the small-sized paper discharged from the pair of discharge rollers 13 and 14 passes through the upper side of the switching gate 33, is gripped and conveyed by the pair of additional conveyance rollers 32, and the leading edge of the sheet reliably reaches the front plate 8. However, at that point, the trailing edge of the paper has already separated from the pair of additional conveying rollers 32 and falls between the side plates 18.degree. 27 of the tray 4. On the other hand, in the case of large-sized paper, the switching gate 33 is switched to the position shown by the broken line, so that the paper is conveyed at the bottom, so that when the leading edge of the paper reaches the front plate 8 and stops, the There is no problem in that the rear part is held by the additional roller pair 32 and does not fall onto the tray 4.

Effects As described above, according to the present invention, sheets of various sizes can be reliably aligned and scooked onto the intermediate tray with the front edge aligned with the reference surface with a simple configuration, so that it is possible to stack sheets of paper of various sizes on the intermediate tray, so that it is possible to stack sheets of paper with a simple configuration. Adjustment work and assembly time during printing press manufacturing are reduced, which contributes to cost reduction, and reliable operation reduces failures, resulting in improved copy quality and work efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the structure of a separately proposed intermediate tray, and FIG. 3 is a sectional view of its side plate. 1... Intermediate tray unit 4... Tray 8... Front contact plate (paper leading edge alignment reference surface) 13.14...
・Ejection roller pair (carrying mechanism) 15...Ejection guide 18...Movable side plate 32...Transport roller pair 33...Switching guide plate

Claims (2)

[Claims] (1) A copying machine, etc. that has a carry-in mechanism that feeds paper that has been subjected to single-sided copying, etc. into a tray, and a paper leading edge alignment reference surface that aligns and aligns the leading edges of the sheets fed by the carry-in mechanism. In the intermediate tray, a switching guide mechanism is provided on the downstream side in the feeding direction of the carrying mechanism, which can select a paper feeding position determined by the paper size and the position of the paper leading edge alignment reference plane. intermediate tray. (2) The carrying mechanism includes a pair of ejection rollers that feed the paper almost horizontally into the tray, and a pair of ejection rollers that directs the paper toward the paper leading edge alignment reference surface by aligning the top surface of the paper ejected from the pair of rollers. the switching guide mechanism is provided downstream of the pair of discharge rollers along the discharge guide, and is provided upstream of the pair of conveyance rollers and guides the paper along the path to the conveyance rollers. and a switching guide plate that can be selectively switched to either one of the paths passing below the conveyance roller. .