JPH02746Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a copying device that can easily handle jams.

[Conventional technology]

Originally, it would be desirable for a copying machine to include all the cassettes according to the size of paper to be used in the main body of the machine, since this would eliminate the need to replace the cassettes, but there are restrictions on the size of the main body of the copying machine. Therefore, there is a limit to the number of cassettes that can be installed in the main body itself.

Therefore, in recent years, new copying apparatuses have been devised and put into practical use that are connected to the paper feed section of the copying apparatus main body by utilizing the space of the stand on which the copying apparatus main body is placed. However, when the paper feed section is installed on the pedestal side, the path of the paper to the transfer section is long, and even if an intermediate paper feed roller is provided in the middle of the guide plate, the possibility of jamming is unavoidable.

For this reason, the first paper feed section and the second paper feed section that conveys the paper ejected from this section to the transfer section are connected inside the space of the frame, so that one side of the guide plate that guides the paper can be opened. Copying machines have also appeared that are configured so that jammed paper can be easily removed.

However, in these copying devices, when the guide plate is opened to remove jammed paper, the copy start button may be pressed by mistake and the copying operation is started before the removal operation is completed, or the copying operation may be started after the removal operation is completed. Problems such as secondary jamming occurring due to copying operations being performed while forgetting to close the guide plate have become frequent.

For this reason, recently, a sensor has been installed near the guide board that outputs a signal to stop the copying operation while the guide board is open, so that the copying operation will not start before the removal operation is completed. A copying machine was invented.

[The problem that the idea aims to solve]

However, in the above-mentioned copying apparatus, the jam detection means and the signal output sensor for stopping the copying operation are separate, so the structure is complicated and prone to failure, and the assembly is complicated.
There was a problem in that the cost was high due to the large number of parts.

[Means to solve the problem]

In view of the above points, this invention was developed in a copying machine in which one side of a guide plate that guides paper ejected from a first paper feed section to a second paper feed section can be opened. a movable rod that is pushed and retracted by the paper when the paper passes; a signal output means that outputs a jam signal when the paper with the movable rod retracted does not reach the second paper feed section within a predetermined time; By providing a receiving member that is displaced in conjunction with the opening of the guide plate and holds the movable rod in a retracted state at the displaced position, it is possible to provide a compact copying device that is difficult to break down and is inexpensive. .

〔Example〕

Next, this invention will be explained based on an embodiment shown in the accompanying drawings. In the figure, the photoreceptor provided on the main body side and the processing means around it are omitted because they are well known and are not directly related to the invention.

Reference numeral 1 denotes a paper feed tray, and the paper feed tray 1 is shown attached to the bottom plate 2 of the main body of the copying apparatus from the side of the mount (not shown) via a mounting member 3. The paper feed tray 1 includes a first paper feed section 6 that grips and conveys the paper 5 taken out one by one from the paper feed cassette 4, and receives the paper 5 discharged from the first paper feed section 6, and has a steep upward curve. It is provided with a guide plate 7 that draws and guides the paper 5, and an intermediate paper feed section 8 that feeds the paper 5 halfway along the guide plate 7. The paper 5 ejected from the paper feed table 1 by the action of the intermediate paper feed section 8 passes through a second paper feed section (register roller) 9 (not shown) of a paper feed table (not shown) installed on the main body of the copying machine. The paper is fed to a transfer section (image forming section). The second paper feed section 9 remains in a stopped state until the leading edge of the paper reaches it, and operates based on a synchronization signal generated during the operation of the optical system or photoreceptor.

The guide plate 7 is composed of an inner fixed plate 7a and an outer movable plate 7b.
It is pivotally connected via the shaft 11 and can be opened as shown in the third figure. This is to make it easier to take out the paper 5 if it jams while passing through the guide plate 7.

Reference numeral 12 denotes an opening/closing mechanism for opening and closing the movable plate 7b of the guide plate 7. The opening/closing mechanism 12 has a handle 14 fixed to the outer end of a shaft 13 inserted between the side frames of the paper feed table 1, and the handle 14 is rotated upward. By rotating the arm 15 fixed to the center of the shaft 13, the movable plate 7
b is held in a closed state via a projection member 16 provided on its outer surface, and when the handle 14 is rotated downward, the movable plate 7b is opened by its own weight according to the arm 15. The handle 14 holds the movable plate 7b in the open or closed state by the action of a spring 18 stretched between a pin 17 set up on its side and a pin 17' set up on the side frame of the paper feed table 1. can.

The intermediate paper feeding section 8 is a fixed plate 7a of the guide plate 7.
a drive roller 21 fixed to a drive shaft 19 inserted between the side frames of the paper feed table 1 along the inner surface side of the drive roller 21, and a part of which is exposed to the outer surface side through a notch 20 in the center of the fixed plate 7a; It is rotatably provided on a shaft 23 that is supported between protrusions 22 and 22' that stand parallel to the outer surface of the movable plate 7b so as to be able to press against the roller 21, and is provided at the center of the movable plate 7b. A driven roller 25 is partially exposed to the inner side through a notch 24 (see FIG. 5). A driven roller 25 constituting the intermediate paper feeding section 8 is pressed against the driving roller 21 by the action of a spring 18 that holds the movable plate 7b of the guide plate 7 in a closed state. In order to effectively utilize this pressure contact force, the arm 15 is pressed directly below the driven roller 25. Also,
The driven roller 25 is simultaneously separated from the driving roller 21 by opening the movable plate 7b as shown in the third figure.

Reference numeral 26 is a movable rod that protrudes between the guide plates 7 during normal operation, and is pushed by the paper 5 and retracts into the fixed plate 7a when the paper 5 passes through. The movable rod 26
is bent into a deformed cylindrical shape, and during normal operation, the bent end portion 26a protrudes between the guide plates 7 through the slits 28 provided at corresponding locations on the fixed plate 7a and the movable plate 7b, as shown in FIG. 4A, and turns off the signal output means 27. On the other hand, when the paper 5 passes between the guide plates 7, it is pushed by the paper 5 and sinks into the fixed plate 7a as shown in FIG. 5B, turning on the signal output means 27.

In addition, when the signal output means 27 is ON, it not only issues a stop signal to stop the first sheet feeding section 6, but also causes the sheet 5 with the movable rod 26 retracted to reach the second sheet feeding section 9 within a predetermined time. If the paper 5 does not reach the paper 5, a jam signal is output to stop the copying function.

29 is displaced in conjunction with the opening of the guide plate 7,
This is a receiving member that can hold the movable rod 26 in the retracted state at the displaced position. By the action of a spring (not shown), one end of this receiving member 29 passes through a slit 30 provided in the fixed plate 7a to the movable plate 7b.
The movable rod 26 is biased so as to come into contact with the inner surface of the movable rod 26, and a protruding rod 31 is protruded from the other end thereof, and is inserted near the lower side of the bent portion 26b on the base side of the movable rod 26 protruding between the guide plates 7 as described above. has been done. Therefore, the receiving member 2
9 has no effect on the movable rod 26 when the movable plate 7b is closed as shown in FIGS. 2 and 4A, but when the movable plate 7b is opened as shown in FIGS. 3 and 4B. If the movable rod 26 falls toward the space between the guide plates 7 due to the action of a spring (not shown), the movable rod 26 is held in the retracted state by the protruding rod 31 at the other end. Therefore, the ON state of the signal output means 27 continues and the output of the jam signal is maintained. This state is canceled by closing the movable plate 7b, but until the movable plate 7b is closed, the copying operation will not be started even if the copy start button is pressed.

[Effect of idea]

As described above, according to this invention, in the copying apparatus in which one side of the guide plate that guides the paper discharged from the first paper feed section to the second paper feed section can be opened,
A movable rod that protrudes between the guide plates during normal operation and retracts when being pushed by the paper when the paper passes, and a jam signal when the paper with the movable rod retracted does not reach the second paper feed section within a predetermined time. and a receiving member that is displaced in conjunction with the opening of the guide plate and holds the movable rod in a retracted state at the displaced position, so that the jam detection means and the copying operation can be easily performed. It is no longer necessary to provide a separate signal output sensor for stopping, which significantly contributes to reducing manufacturing costs and simplifying the manufacturing process. Furthermore, the copying apparatus as a whole can be made compact and has various excellent effects, such as being less likely to break down.

[Brief explanation of the drawing]

The figures show one embodiment of this invention, in which Fig. 1 is a side sectional view, Fig. 2 is a partially cutaway perspective view when the movable plate is closed, and Fig. 3 is a perspective view when the movable plate is opened. 4A and 4B are explanatory diagrams showing the functions of the movable rod and the receiving member of the signal output means, and FIG. 5 is a plan sectional view of the intermediate sheet feeding section. DESCRIPTION OF SYMBOLS 1... Paper feed stand, 6... First paper feed section, 7... Guide plate, 7a... Fixed plate, 7b... Movable plate, 8... Intermediate paper feed section, 9... Second paper feed section , 12... Opening/closing mechanism of movable plate, 14... Handle, 15... Arm,
21... Drive roller, 25... Followed roller, 26
...Movable rod, 27...Signal output means, 29...Receiving member, 31...Protrusion rod.

Claims (1)

[Scope of utility model registration request] In a copying machine in which one side of the guide plate that guides the paper ejected from the first paper feed section to the second paper feed section can be opened, the guide plate protrudes between the guide plates during normal operation, and presses against the paper when the paper passes through. a movable rod that retracts when the movable rod is retracted; a signal output means that outputs a jam signal when the sheet into which the movable rod is retracted does not reach the second sheet feeding section within a predetermined time; A copying apparatus comprising: a receiving member that is displaced and holds the movable rod in a retracted state at the displaced position.