JPS594561A - Stacker - Google Patents

Abstract

PURPOSE:To prevent jamming reliably by providing means functioning to maintain contactless state of the paper sequentially carried into the stacker untill it will come over the stacked paper. CONSTITUTION:In a printer 1 where the paper to be fed from a roll through function of a tractor 11 is passed sequentially through a latent image forming drum 13 and a thermal fixer 15 and cut into fixed length by a rotary cutter 12, a stacker S is arrranged at the paper discharge port of the printer 1 while inclining downwardly. Said stacker S is provided with a stack box 3 having an upper guide 10 at the upper leading edge side while movable guides 8 openable/ closable by a rotary solenoid 9 are provided at both upper sides of the inlet. When containing the cut paper, the paper will pass over said guide 8 and guided under contactless state untill coming above the stacked paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a cut paper stacker used in printers, copying machines, and the like.

(F) Prior Art and Problems Conventionally, in printers, copying machines, etc. that use cut paper, the ejection roller 2 is installed in the opening of the main body 1, as shown in Fig. 1, and the stacker is simply connected to a box 3. Star paper 4,
I will

However, when there are various paper sizes, the papers cannot be neatly stacked in one box.

That is, as shown in FIG. 2(a), the paper 4 stacked due to its own weight bends downward and becomes stacked 5 (especially short paper).
It gets caught on the rear end 6 and jams occur.

Furthermore, when the paper 4 has a tractor feed hole 7 as shown in FIG. 2(b), if the paper 4 advances while contacting the top surface of the stack 5, it will get caught in the tractor feed hole 7 and jam. .

(OBJECT OF THE INVENTION The object of the present invention is to provide a stacker that prevents the occurrence of jams as described above and neatly stacks sheets of various lengths or sheets with tractor feed holes in one box. be.

(2) Components of the Invention When paper enters the stacker, if it does not come into contact with the top surface of the stack, the above-mentioned jam will not occur.

The object of the present invention is to support the paper by a moving guide for a certain period of time depending on its length, to prevent the paper from bending due to its own weight, and to maintain a non-contact state between the stack and the paper until the paper reaches the top of the stack. This is achieved by providing a stacker with

(6) Structure of the invention An embodiment of the stacker according to the invention is shown in FIG.

In FIG. 3, 3 is a stack box, which is installed so as to be inclined downward by an angle θ.

Reference numeral 8 denotes a moving guide, which is opened and closed as shown by the arrow by a rotary solenoid 9 (trade name, manufactured by Shindengen Kogyo). 10 is an upper guide.

FIG. 4 shows the state of connection between the stacker and the printer.

Paper 4 (roll paper) is fed by a tractor 11 within the printer main body 1 . A rotary cutter 12 (trade name: Hitachi Metals) receives a signal (not shown) corresponding to the paper length and cuts the paper into various lengths, such as A4°, B4°, etc. letter length)
Cut to. In FIG. 4, B is a latent image forming drum, 14 is a transfer corotron, and 15 is a heat fixing device.

Next, the stacking operation by this stacker will be explained using the time charts shown in FIGS. 5 and 9.

First, as shown in FIG. 5, the leading edge of the paper 4 is in the cutter 12 in the standby state.

Next, as shown in FIGS. 6(a) and 6(b), a printing state is entered, and at the same time as the tractor 10 starts driving, the rotary solenoid 9 operates and the moving guide 8 closes.

A moving guide 8 supports the paper from both left and right sides so that the paper 4 does not bend downward due to its own weight.

Next, when the rotary cutter 12 cuts the paper 4 as shown in FIG.

On the other hand, after maintaining the closing operation of the moving guide 8 for a time tA, tB, or tL as shown in FIG. 9, which is the timing at which the paper 4 glides to the farthest distance, the moving guide opens and retreats.

Next VC As shown in FIG. 8, the sheets 4 hit the front plate 16 of the stack box 3 and then fall due to their own weight and are stacked.

For stacking the second and subsequent sheets of paper 4, the time tI after cutting by the rotary cutter 12 is as shown in FIG.
') After that, the moving guide 8 closes, and then the operations shown in FIGS. 7 and 8 are repeated.

The times tA, ta, tL, and tn in FIG. 9 are adjusted so that the sheets can be stacked reliably.

Examples of the adjustment results are shown in FIGS. 10 and 11.

In this embodiment, the stack box 3 contains A4. I was able to stack up to 400 sheets of B4° letter paper.

In addition, in FIG. 4, the upper guide 10f: is fixed;
If a mechanism is provided to lower the stack box as the stack amount increases, the stack capacity can be increased.

(G) Effects of the Invention According to the present invention, when the paper enters the stacker, the top surface of the stack and the paper are kept in non-contact, thereby preventing paper jams from occurring when paper of various sizes or paper having a tractor feed hole is used. You can stack them in one box without having to do anything.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional stacker. FIG. 2 is a diagram for explaining the occurrence of a jam, FIG. 3 is a diagram showing a stacker according to the present invention, FIG. 4 is a diagram showing a connection state between the stacker and a printer, and FIG. 5 is a diagram for explaining the occurrence of a jam. 6, 7, and 8 are diagrams for explaining the stack operation, FIG. 9 is a time chart, and FIG. 10. FIG. 11 is a diagram showing the adjustment results. In the figure, numeral 3 is the printer body, and 3 is the stack box. 4 is a sheet of paper, 8 is a moving guide, 9 is a rotary solenoid, 10 is an upper guide, 11 is a tractor, and 12 is a rotary cutter.

Claims (1)

[Scope of Claims] 1) A stacker for cut sheets, characterized in that a means is provided for maintaining a non-contact state until the sheet entering the stacker comes above the already stacked sheets. 2) A patent characterized in that the means for keeping the paper in a non-contact state is constituted by a moving guide that supports the paper entering the stacker, retreats the paper, and drops the paper onto the already stacked paper. A stacker according to claim 1. 3) The stacker according to claim 2, wherein the moving guide is driven to support the paper after a predetermined time from the time when the paper is cut. 4) The stacker according to claim 2, wherein the paper supporting time of the moving guide is selected depending on the length of the stacked papers.