JPS6046709B2 - Copying machine that makes it easy to remove jams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that facilitates handling of a "jam" or paper jam when it occurs during a copying operation.

When a jam occurs in a copying machine, if the paper feed roller is in contact with the paper surface, the paper may be torn and left behind when removing the jammed paper, or the paper may slip past the paper underneath and come out. Therefore, conventionally, when taking out jammed paper, the user had to manually lower the position of the transfer paper in the paper feed tray or cassette depending on the paper situation, which caused problems in operability.

There are also copiers that allow the paper feed roller to escape from the paper surface after each sheet of paper is fed, but as the copying speed increases, the amount of escape cannot be increased, so this has the disadvantage that it is difficult to secure space for removing jammed paper. Ta. This invention was made in view of the above points. During normal paper feeding, paper is fed in a stable state without moving the paper feed roller up and down, and when a jam occurs, the transfer paper in the paper feed tray or cassette is automatically loaded. The purpose is to lower the paper to facilitate the removal of jammed paper, improve operability, and stabilize paper feeding performance.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway side view of a copying machine showing an embodiment of the present invention, in which a paper feed tray 1 is loaded with transfer paper 2, and during a copying operation, the uppermost transfer paper is transferred to a paper feed roller 3. The paper is fed by the registration roller 4, is brought into contact with the photoreceptor drum 5 at a predetermined timing, and after the toner image formed on the photoreceptor drum 5 is transferred by the transfer separation charger 6, it is separated and conveyed. The copy is sent by the section 7 to the fixing device 8 where it is fixed, the copy is completed, and the copy is discharged onto the paper discharge tray 9.

10 is a paper feed cassette, 11 is a paper feed roller for sending out the transfer paper 2 in the paper feed cassette 10, and 12 is a pressure shoe. It is a kind of elevating device that is inserted through a through hole 10a provided on the bottom surface, lifts the movable bottom plate 10b, raises the transfer paper 2', and brings the topmost transfer paper into contact with the paper feed roller 11 (Fig. 4). reference).

Transfer paper in paper feed tray 1 or paper feed cassette 10 is selected and copied. The paper feed tray 1 has a movable bottom plate 13 on which the transfer paper 2 is placed and a lifting device 14 that raises and lowers the movable bottom plate 13, and as shown in FIG. When pushed into the aircraft, the lifting device 14
As a result, the movable bottom plate 13 rises to the paper feeding level, that is, until the uppermost transfer paper 2 comes into contact with the paper feeding roller 3 (hereinafter referred to as "tray rising"), and a copying ready state is achieved.

When the transfer paper 2 in the paper feed tray 1 runs out, the movable bottom plate 13 is lowered by the lifting device 14 (hereinafter referred to as "tray lowering"), and the lamp 15 indicating that the tray can be pulled out is lit. Further, when it is necessary to replace the transfer paper 2 midway through the process, the tray is lowered by pressing the lowering button 16 and can be pulled out. It is locked by the lock device 17 and cannot be pulled out except when the lamp 15 indicating that it can be pulled out is lit. Next, the operation when a jam occurs will be explained. If a jam occurs during copying, the machine will stop in a state as shown in FIG. At this time, it is necessary to open the cover 18 and take out the jammed paper 2a, but if the paper remains in contact with the paper feed roller as shown in FIG. 1, it is difficult to pinch and take out the jammed paper 2a. Therefore, when a jam occurs, the jam is displayed on a display unit (not shown), and the lifting device 14 is automatically driven to lower the tray as shown in FIG. 2, thereby separating the paper feed roller 3 and the transfer paper 2. This makes it easy to take out the jammed paper 2a. When the jammed paper 2a is removed and the jam display is reset, the lifting device 14 is driven again to automatically raise the tray, and the uppermost transfer paper 2 is moved to the paper feed roller 3.
After coming into contact with , it becomes copyable. In the case of a copying machine having a plurality of paper feed trays 1, only the paper feed tray selected for paper feeding needs to be lowered.

Also, if a jam occurs when the paper feed cassette 10 is selected in the copying machine shown in FIG. In this case, the pressure shoe 12 rotates to the right as shown in FIG.
The transfer paper 2'' placed thereon is lowered and separated from the paper feed roller 11 to facilitate the removal of the jammed paper 2a'', the jammed paper 2a'' is removed, and the jam display is reset. The state returns to the state shown in FIG. 1. By the way, if a jam occurs in the paper feed section during copying of one sheet or the first sheet during continuous copying, the above-mentioned operation is immediately performed.

In addition, when a high-speed copying machine is used for continuous copying, even if a jam occurs in the paper output section, the next paper feed has already started, so it is necessary to remove that paper as well. Make it work the same way. Note that if a jam occurs during the copying of the second and subsequent sheets during continuous copying, the portion necessary for paper ejection (transport section , fixing device 8, etc.) and stop the operation of other parts, and when the ejection of the preceding transfer paper 2b is completed, the operation of the parts necessary for paper ejection is also stopped and the above operation is performed. .

Furthermore, the number of copies is displayed based on the number of fed sheets, and a register is provided to store the number of ejected sheets separately from the number of fed sheets. When a jam occurs, the data on the number of ejected sheets is transferred to the number of fed sheets register, and printing is completed. Display the number of sheets and notify the operator. After removing the jammed paper, copies are made using the copy dial or numeric keypad to determine the remaining number of copies for the set number of copies. FIG. 5 is a block diagram showing the control system of the above embodiment.

20 is a control unit, such as a central processing unit (CPU) with calculation and judgment functions, a read-only memory (ROM) for storing processing programs, a random access memory (RAM) for storing data, an input/output interface, etc. A microcomputer is used.

Reference numeral 21 denotes a copying section consisting of a photosensitive drum, an exposure lamp, various chargers, a conveyance section, a fixing device, etc., and a control section 20 fetches signals from various sensors and microswitches of the copying section 21, and processes them according to a processing program. Each part of the copying section 21 is controlled to perform sequence control of the copying process.

The display unit 22 also displays the number of copies, copy size,
Displays various abnormal conditions, etc.

Reference numeral 23 denotes a jam detector that separately detects a jam in the paper feed section and a paper discharge jam; 14 denotes the elevating device for the paper feed tray or cassette; 24 denotes a lowering completion detector; 25 denotes a rise completion detector; 26 denotes a copying machine. 21 is a main relay of a driving power supply circuit for supplying power to the lifting device 14, etc., and 27 is a reset switch.

FIG. 6 is a flowchart showing the control operation when a jam occurs in a conventional copying machine. In the case of a jam in the paper feed section or the paper output section, each jam is immediately displayed, and at the same time, control outputs other than the display are output. The main relay was turned off and all operations other than the display were stopped in preparation for jam clearance. In contrast, the control operation when a jam occurs in the above embodiment of the present invention will be explained once again with reference to the block diagram of FIG. 5 and the flow diagram of FIG.

When the jam detector 23 detects a jam in the paper output section, the display section 22 immediately displays the paper output jam, and at the same time turns off control outputs unnecessary for lowering the tray, and turns off all outputs in the copying section 21. At the same time, the tray lifting device 14 is driven to lower the tray, and the lowering completion detector 24
When the completion of the descent is detected by
Make jam processing possible.

On the other hand, when the paper feed section jam is detected by the jam detector 23, the display section 22 displays the paper feed section jam, and also determines whether or not it is the first copy.
(including the case of copying only one sheet), immediately perform the same operation as described above to make it possible to clear the jam, and in the case of the second or later copy of continuous copying, the part necessary for paper ejection in the copying section 21 The control output is turned off to stop the operation, and when the discharge of the preceding transfer sheet is completed, the same operation as described above is performed to make the jam processing possible.

Although not shown in the flowchart of FIG. 7, when the jammed paper is removed and the reset switch 27 is operated, the jam display is reset, and the main relay is turned on to drive the tray lifting device 14 again and the tray is removed. , and when the completion of the rise is detected by the rise completion detector 25, the copying section 21
As described above, it is possible to make the copy operation possible.

As described above, according to the present invention, when a jam occurs, the transfer paper in the paper feed tray or cassette in use is automatically lowered to a position away from the paper feed roller, making it easier to remove the jammed paper. When the jammed paper is removed and the jam display is reset, the state is automatically restored to a copyable state, which greatly improves operability. Moreover, since there is no need to release the paper feed roller, stable paper feed performance is achieved even on high-speed machines. is obtained. Furthermore, as shown in the example, if a jam occurs in the paper feed section after the second copy during continuous copying, the preceding transfer paper that has already been printed is ejected, the tray is lowered, and the main relay is turned off. By performing the above operations and controlling the paper so that it is ready for jam handling, it is possible to eliminate the waste of even usable printed advance transfer paper from being disposed of as jammed paper.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a copying machine showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the jam removal state of the paper feed tray, and Fig. 3 shows the state in which the paper feed tray is pulled out. FIG. 4 is an explanatory diagram showing the state of paper jam removal in the paper feed cassette, FIG. 5 is a block diagram showing the control system in the embodiment of the present invention, and FIGS. 6 and 7 are conventional copying diagrams. FIG. 3 is a flowchart showing a control operation when a jam occurs according to an embodiment of the present invention. 1...Paper feed tray, 2,2''...Transfer paper, 3,11...Paper feed roller, 10...
Paper feed cassette, 12... Pressure shoe, 14...
... Lifting device, 20 ... Control section, 21 ...
... Copying section, 22 ... Display section, 23 ... Jam detector.

Claims (1)

[Claims] 1. A lifting device that raises and lowers the transfer paper in the paper feed tray or cassette, and when a jam occurs, displays a jam indication and stops the copying function, and also drives the lifting device to automatically lift the transfer paper in the paper feed tray or cassette that is in use. The transfer paper is lowered to a position where it is separated from the paper feed roller, and when the jammed paper is removed and the jam display is reset, the lifting device is driven to move the transfer paper to a position where the top of the paper touches the paper feed roller. 1. A copying machine that facilitates jam handling, characterized in that the copying machine is equipped with a control device that enables copying after being raised.