JPS6050549A - Copying device - Google Patents

Abstract

PURPOSE:To prevent exactly generation of a discharged paper jam in case of copying of a large quantity by providing a control means for detecting a fact that the discharged paper on a discharged paper receiving tray has reached a quantity set in advance, and stopping a copying operation by its signal. CONSTITUTION:A discharged paper detecting switch SW3 consisting of a light emitting part and a photodetecting part is provided in the vicinity of a paper discharge part 11, and the paper of the uppermost layer of a discharged paper laminated and stored in a discharged paper receiving tray 9 is detected, and when its quantity reaches a set quantity, the copying operation is stopped. Accordingly, even in case of copying of a large quantity, the copying is executed smoothly without generating a discharged paper jam.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying apparatus such as an electrostatic transfer copying machine.

Conventional Structures and Problems In recent years, as copying apparatuses have become faster, they are increasingly being equipped with automatic document feeders and large-capacity paper feeders for large-volume copying.

A conventional copying apparatus will be explained with reference to FIG. When the copy start switch is pressed in the copyable state, the paper feed roller 1 is driven and the uppermost sheet of paper stored in the paper feed cassette 2 is fed out.

The fed paper is sent to a pair of lettuce rollers 3a.

Paper detection switch SW provided on the paper feed roller 1 side of 3b
When paper 1 is detected, the paper feed roller 1 is stopped after a certain period of time, and the tip of the assembly is placed on the registration roller 3a.

3b. Further, after the preparatory operations of the photoreceptor drum 4, transfer device 5, and separator 6 are completed, the scanning operation of the optical unit (not shown) is started, and a xerographic image is formed on the photoreceptor drum 4.

And the paper where this xerographic image is waiting is A.
, ′? When the synchronous position is reached, the registration rollers 3a,
3b rotates and feeds the paper into the transfer device 5, where the developed images are transferred onto the paper. Thereafter, the photosensitive drum 4 and the transferred paper are separated by a separator 61). The separated paper is conveyed by the paper conveyor 7 to the fixing device F11:, and the transferred image is fixed on the paper by the fixing device F11! , microswitch SW2, pair of paper ejection [1-=510a, 10b
, the paper tray 111 passes through the paper discharge port 11, and the paper tray 111 is ejected onto the tray 9, and the copying operation is completed. Here, in order to detect a paper jam, a paper discharge jam detection timer is used to control the passage of paper within a certain period of time (varies depending on the paper size) after the microswitch SW2 detects the paper. At this point, if the paper is not passing through, that is, if the same paper is detected even after a certain period of time has passed since the micro switch SW2 detects the paper, it is determined that there is a paper output jam. , the operation of the copying machine is stopped and a paper jam is displayed.

However, in the conventional configuration as described above,
If the sheets of paper that are ejected to the paper ejection tray 9 at the same time for one copy are stacked, and the top layer of paper is at the same height as the paper ejection port 11 and blocks the paper ejection port 11, the paper will not be ejected. The paper may run out and remain between the paper ejection port 11 and the fixing unit 8 and cannot pass through the micro switch SW2, resulting in a paper ejection jam, or the paper on the paper ejection tray 9 may be ejected by the paper sent out from the ejection port 11. Since the receiver is dropped outside the book 9, the operator cannot leave the copying machine at all times and has the problem of not being able to use his or her working time effectively.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art, and to provide a copying apparatus that can reliably prevent paper jams during large-volume copying.

Structure of the Invention In order to achieve the above object, the copying apparatus of the present invention includes a detection means for detecting that the ejected paper on the ejected paper tray reaches a preset paper ejection height, and a detection signal from the detection means. control means for prohibiting the copying operation according to the
゛It is 4 compositions.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention.
In the block diagram near the white of the paper, the constituent elements shown in FIG. S'At31;
t f Paper discharge inner to detect the paper stack height of JI paper booklet 9! It is an output switch, and the JJI is as close as possible between the paper ejection port 11 and the attachment part of the paper ejection tray 9 to the main body.
°The paper ejection detection switch SW3 is installed at a position close to the paper 111.This paper ejection detection switch SW3 is composed of a photoelectric element equipped with a light emitting part and a light receiving part, and the light emitted from the light emitting part is reflected by the object to be detected. The light receiving section detects the reflected light.
This is a proximity sensor that detects objects within the detection area. For example, in FIG.
3 can detect objects within the detection area A, so the discharged paper 12 is not detected, but only the discharged paper 13 is detected. The process until the paper is ejected is exactly the same as that of the conventional apparatus shown in FIG. Here, when the highest layer of ejected sheets that continue to be stored in a stacked state in the ejected paper tray +1119 reaches the height detected by the ejected paper detection switch SW3; 1, the copying operation is prohibited. The paper discharge detection switch SVI/3 is connected to a control circuit (not shown) so that the paper discharge detection switch SVI/3 is connected to a control circuit (not shown). The control circuit includes a paper discharge detection switch SW3
(M) is always determined, and when the paper ejection detection switch SW3 detects paper, the copying device completes the copying operation only for the paper in the middle of copying operation, and prohibits the copying operation for the subsequent paper, A buzzer (not shown) is activated as a warning means.

As described above, according to this embodiment, the excessive stacking state of the paper ejection tray 9 can be detected by the paper ejection detection switch SW3 installed near the paper ejection port 11, and when this state is detected, the copying operation is prohibited. By doing so, it is possible to prevent paper output jams during large-volume copying.

FIG. 3 is a block diagram of the vicinity of the paper discharge port of a copying apparatus in another embodiment, and 13 is a paper discharge tray, and this paper discharge tray 13 is attached to the copying machine main body 15 with shirts 1 to 14. Therefore, the discharge tray 13 can be displaced about the shaft 14 in the directions of arrows B and C. Further spring 1
Since the copying apparatus main body 15 and the discharge tray 13 are connected at 6, an equilibrium state is maintained. Further, as the displacement detection switch SW4, a photoelectric element capable of detecting an object within the detection area is used as in the above embodiment. The displacement detection switch SW4 detects the position of the paper receiving tray 13 displaced in the direction of arrow C when the top layer of ejected paper stored in the paper receiving tray lIn13 reaches the same height as the paper ejecting port 11. It is installed at U so that the back side can be detected for the first time.

The operation is exactly the same as that of the conventional apparatus shown in FIG. 1 until the paper is ejected. Here, the paper ejection tray 13 is displaced in the direction of arrow C due to the weight of the ejected papers stored in a stacked state. SW4 detects the paper discharge tray 13.This transition detection switch SW4 is connected to a control circuit (not shown), and similarly to the above embodiment, when the operation detection switch SW4 detects the paper discharge tray 13, copying is started. It is controlled so that the movement is prohibited and the buzzer sounds.

According to this embodiment, the weight of the copy material to be stored is
By detecting the displacement state of the paper receiving tray 13, which is displaced by Paper jams can be prevented.

In addition, in each of the above embodiments, in a3, switch SW3゜SW
4 I used a photoelectric element, but the switch SW3.8W4
What can be used as the sensor is not limited to a photoelectric element, but any device can be used as long as it has the function of detecting the proximity of the original image and the paper discharge trays 9 and 13. For example, a microswitch equipped with an actuator or the like can be used.

In addition, the installation position of the paper discharge detection switch SW3 was set between the paper discharge port 11 and 1) the attachment part of the one-sheet booklet 9 to the main body of the copying machine; Any position that can detect this is sufficient. For example, the same effect can be obtained by providing the connecting portion above the paper discharge tray 9 from the upper part of the paper discharge port 11.

Also, the installation position of the displacement detection switch SW4 is set to the paper discharge tray 13.
Although the position is below the paper receiving tray 13, any position near the paper receiving tray 13 where the displacement of the paper receiving tray 13 can be detected may be used. For example, paper discharge tray 1
A similar effect can be obtained by providing the shifter 1 above the mounting portion of the shifter 14 of No. 3.

In addition, in the embodiment described in 1.1-, a buzzer was used as an alarm means to notify that copying is prohibited +L, but the alarm means is not limited to a buzzer, and has the function of issuing an alarm/warning. If it has -(-t)J: Yes.

For example, a control panel lamp or light emitting diode display can be used.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, a preset waste product is detected and the copying operation is prohibited, so that even when copying is done smoothly, there is no paper discharge error. You can get a copy. Also, from this, the operator can be away from the copying machine during the copying process, and the working time can be used effectively.

[Brief explanation of the drawing]

Fig. 1111 [, 1 Overall configuration diagram of a copying machine in the Confucian Song Dynasty, Fig. 2 j and Fig. 3 - Copying machine 6 in an embodiment of the present invention, respectively.
FIG. 9.13... Paper discharge tray, 11... Paper discharge slot, 14...
・Shaft, 16... Spring, SW3... Paper discharge detection switch, SW4... Displacement detection switch agent Yoshihiro Morimoto Figure 1 4 Island 8 Figure 2 δ tag Figure 9 1

Claims (1)

[Claims] 1. A detection means for detecting that the discharged paper on the IJI paper receiver has reached the discharged paper ml which has been stored in the tray in advance, and copying operation is prohibited based on the detection signal from this detection means. A copying apparatus comprising a control means for controlling. 2. The copying apparatus according to claim 1, wherein a detector for detecting the stacked state of ejected paper is disposed near the paper ejection port as the first stage of detection. 3. Claim 1, wherein the detecting means includes a detector disposed near the paper receiving tray to detect the amount of displacement of the paper receiving tray depending on the amount of discharged paper stored on the receiving tray. 1. The copying apparatus according to any one of Claims 1 to 3, wherein the detection means is configured to operate a copy-inhibited state warning means based on the detection signal thereof.