JPS59102254A - Form detecting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a paper detection device for copying machines, printing machines, etc., and more particularly to a paper detection device for a stacker that stacks paper that requires refeeding. be.

BACKGROUND ART Paper detection in this type of stacker detects whether or not paper is stacked normally, and is used for jam detection, stack number detection, and the like.

FIG. 1 shows a simplified side view of a conventional stacker equipped with a paper sensor.

In the figure, reference numeral 1 denotes a stacker having a bottom plate 2 and a stopper 3 at the tip, and a paper refeed roller 4 that can move up and down is provided on the front upper blade of this stacker 1. Additionally, a feed roller 5 is provided above the rear end of the stacker 10 to feed the paper onto the bottom plate 2. A paper sensor 6 is provided adjacent to the feed roller 5. This paper sensor 6 detects the paper 7 entering the stacker 1.

In such a conventional device, the paper 7 near the feeding roller 5
Since only the state of I am sorry to say that it cannot detect jamla.

Therefore, it is necessary to detect the presence or absence of paper entry at the leading end of the stacker l in the paper traveling direction, that is, near the stopper 3. However, the paper sensor 6, which is composed of a micro switch, a photo sensor, etc., cannot detect paper in a part of the stacker where there is already a stack of paper below the paper 7 to be detected.

Purpose The present invention has been made to solve the above-mentioned problems, and is capable of reliably detecting the jam of the sheets 7 fed from the feed roller 5 toward the stacker 1 or the number of sheets stacked. The object of the present invention is to provide a paper detection device with the following features.

composition The structure of the present invention will be explained below based on examples.

In this figure, parts similar to those in FIG. 1 are given the same reference numerals.

FIG. 2 is a schematic external perspective view of a paper detection device (a combination of a paper sensor and a stacker) according to an embodiment of the present invention.

In the figure, the stacker 1 has a fixed side plate 8 in addition to a bottom plate 2 and a stopper 3 at the tip, and a movable side plate facing the fixed side plate 8 and movable in a direction substantially perpendicular to the conveyance direction of the paper 7. (Moving means) 9 is provided. Therefore, this movable side plate 9 has the effect of deflecting the incoming paper 7 from the conveying path in a direction perpendicular to the fixed side plate 8 and pressing it against the fixed side plate 8. A paper sensor 6 is fixedly provided on the inner surface of the movable side plate 9.

The paper 7 fed by the feed roller 5 toward the stacker 1 is moved slightly in the right angle direction by the movable side plate 9 at the position where the leading edge hits the stopper 3, so that the paper 7 is shifted from the conveyance path. FIGS. 3(a) to 3(f) are plan views showing the paper detection operation, stacking, and paper refeeding operations in this paper detection device.

First, FIG. 2A shows a state in which the paper 7 is conveyed by the feed roller 5 through the conveyance path toward the stock corner 3 of the stacker 1. At this time, the left end in the figure is guided by the movable side plate 9. At this time, the laminated paper 10 is already present on the stacker 1. In this state, the paper refeed roller 4 moves upward so as not to obstruct the paper 7 from entering.
FIG. 2B shows a state in which the paper 7 hits the stopper 3. At this time, the left end of the paper 7 is the laminated paper 10.
The paper sensor 6 protrudes by one minute from the paper feed path (in other words, the stacked paper 10 in the stacker 1 is moved perpendicularly by one minute from the conveyance path).
is designed to detect this protrusion.

In this way, when the paper sensor 6 detects the paper 7 that has entered the final contact position with the stopper 3, the movable side plate 9 moves as shown in FIG. It moves in the direction of the arrow shown, that is, to the right, and abuts the paper 7 against the fixed side plate 8, aligning it on the stacked paper lo. When the alignment is completed, the movable side plate 9 moves as shown by the arrow, as shown in FIG.
Return to the left side again and wait for the next paper to enter. The above operations are repeated until the sheets 7 are stacked on the stacker 1.

Next, the operation for refeeding the sheets stacked in this manner (for example, in order to send the back side to a copy station in a double-sided copying machine) is shown in FIG. 3(e).

This will be explained in (f). In this case, stunker 1
is moved in the direction of the arrow, that is, to the left by one width, to return the laminated paper 10 to its original conveyance path, and from this position, the paper is re-fed by the re-feed roller 4 as shown in FIG.

A circuit for moving the movable side plate 9 based on a signal from the paper sensor 6, a circuit for returning the movable side plate 9, a circuit for moving the stacker 1 based on a refeed signal, and a paper refeed roller 4.
Various types of movement control circuits are known and are not shown here.

FIG. 4 is a plan view of a paper detection device according to a second embodiment. In this embodiment, a transverse feed roller 11 is provided on the stacker 1 as a means for moving the paper 7, and the paper 7 is moved perpendicularly from the conveyance path by the transverse feed roller 11.

In this case, the paper sensor 6 is provided on the support plate 9a located at the left end of the conveyance path, and as described above, the paper sensor 6 is located at a position away from the stacked paper on the stacker 1, and the paper sensor 6 is located at the last end of the paper sheet 9a.
can be detected.

As described above, the present invention detects the paper stacked on the stacker at a location slightly deviated from the stacking position in a direction substantially perpendicular to the stacking position. It is possible to reliably detect the paper that is coming, and it is possible to prevent troubles due to jams.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view of a conventional device, FIG. 2 is a schematic external perspective view of a sheet detection device according to an embodiment of the present invention, and FIG.
a), (b), (c), (d), (e
) and (f) are plan views of the respective operating states, and FIG. 4 is a plan view of a sheet detection device according to another embodiment. 1... Stacker, 3... Stopper, 6... Paper sensor, 7... Paper,
9.11... Means of transportation. Figure 1 Figure 2 □
! 4 u no 8 10

Claims (1)

[Claims] a stunker for storing sheets at a position offset from the transport direction in a direction substantially perpendicular to the transport direction; a moving means for moving the sheets on the transport path in one direction of the stunker; ′
L'fc A paper detection device consisting of a paper sensor installed in the transport path.