JPH048424Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a paper feeding device equipped with a feeding safety device for a copying machine that also has a conveyance system for manually feeding recording paper.

[Prior art]

Recording paper for transfer used in electrophotographic copying machines, etc. is usually stacked in a paper cassette, and when the paper cassette is installed in the copying machine, the paper is automatically placed in the top position when copying starts. 1 from the recording paper of
The sheet is being fed into the copying machine and being copied.

When copying originals of the same size continuously in this way, supplying recording paper using the paper feed cassette is extremely efficient, so if it becomes necessary to copy originals of different sizes even temporarily, If the number of copies is large, it is efficient to convert the paper feed cassette to one of a different size and copy.

However, if the number of copies of the different sizes is extremely small, you can manually feed recording paper of different sizes into the copying machine with the current paper cassette attached without having to take the trouble of installing and removing the paper cassette. It may be more efficient to do so.

Such cases are often experienced, and since double-sided copying can be easily performed if necessary, even in commercially available electrophotographic copying machines, recording paper is supplied by both manual feeding and paper feeding cassettes. Now, products with functions that can be used have begun to appear.

An example of a paper feeding mechanism of such a copying machine is shown in FIG.

The recording paper P1 in the paper feed cassette 1 installed in the copying machine is carried out in the right direction by one rotation of the half-moon roller 2 in the counterclockwise direction.
The photosensitive drum 6 rotates clockwise after being reversed in a U-shape along the guide plate 4 by the paper feed roller 3.
The toner image formed on the circumferential surface of the sheet is fed to the image forming process area by driving the second sheet feeding roller 5 whose timing and conveyance speed are adjusted.

The toner image transferred to the recording paper P1 is fused and fixed to the recording paper P1 by a fixing roller 7, and is discharged via a paper discharge roller 8 onto a paper discharge tray 9 outside the copying machine to complete copying.

On the other hand, each sheet of recording paper P2 placed on the manual feed tray 11 attached to the outside of the copying machine is manually inserted into the guide plate 13 through the opening 12 of the copying machine, and then passed through the first paper feed roller 14. Therefore, the paper is fed in the direction of the second paper feed roller 5.

In other words, recording paper P2 fed manually
Similarly to the paper feeding from the paper feeding cassette 1, the toner image on the circumferential surface of the photosensitive drum 6 is fed by the drive of the second paper feeding roller 5 with timing and conveyance speed controlled. Therefore, after the second paper feed roller, the recording paper P1 fed from the paper feed cassette 1 is fed through the same conveyance path.

Therefore, in such a copying machine, while the recording paper P1 is being fed from the paper feed cassette 1 and copying is being performed, while the recording paper P1 is still being driven by the second paper feed roller 5, When the recording paper P fed manually reaches the second paper feed roller 5, the recording papers P1 and P2 overlap, causing defects in copying, separation, and fixing, resulting in a recording paper conveyance failure called a jam. This may also cause problems such as inability to feed the recording paper.

Therefore, in a copying machine having such two recording paper supply means, it is desired to have a paper feeding device equipped with a safety mechanism that prevents the recording papers P1 and P2 from being fed to the common conveyance path at the same time. .

As a means to solve this problem, while feeding the recording paper P1 in the paper feed cassette, the upper driven roller of the first paper feed roller 14 on the manual feed side is retracted upward by a solenoid. There are also proposals to disable the feeding of the recording paper, and proposals to install an electromagnetic clutch between each drive roller that conveys the recording paper and the drive shaft so that the connection can be automatically switched depending on the recording paper supply means. However, all of them require a complicated structure and many expensive parts, which is extremely disadvantageous in terms of product price structure.

[Purpose of invention]

The present invention is a paper feed system for a copying machine that uses an extremely simple device to prevent the recording paper taken out from the paper cassette and the recording paper fed manually from being carried into the conveyance path at the same time. The purpose is to provide equipment.

[Structure of the idea]

The present invention uses the action of the half-moon roller that carries out the recording paper from the paper cassette to evacuate the driven roller in the manual recording paper feeding device from the pressure contact of the drive roller, and locks it in that state to remove the manual recording paper. This method is constructed by disabling the feeding of the paper feed roller, and then simultaneously releasing the lock of the driven roller in conjunction with the start-up of the second paper feed roller.
A cassette feeding means for feeding and conveying stacked recording paper, and a manual feeding means for manually feeding the recording paper, and the stacked recording paper or the manually fed recording paper is transferred to the photoreceptor drum. In the paper feeding device of a copying machine, the paper feeding device includes a second paper feeding roller that feeds paper so as to match the toner image formed on the cassette paper feeding means, and a second paper feeding roller that feeds one sheet of recording paper from the cassette paper feeding means; a cam member provided integrally with the feeding roller;
a first operating member that swings due to the operation of the cam member; a manual paper feed roller of the manual paper feed means that is opened and inoperable due to the operation of the first operating member; and the first operating member. The cassette paper feeding means has a lid lever that engages with a part of the cassette paper feeding means to maintain the operating position, and a second operating member having a protrusion for driving and stopping the second paper feeding roller. During operation, the manual paper feed roller is inoperative, and the second actuating member disengages the foot lever when the second paper feed roller is started, and releases the manual paper feed roller from inoperation. This is achieved by a paper feeding device for a copying machine characterized by the following configuration.

〔Example〕

An embodiment of the paper feeding device according to the present invention is shown in FIGS. 2 to 4.

As a cassette paper feeding means for feeding the recording paper in the paper cassette 1, the half-moon roller 21, which is a feeding roller that feeds one sheet of recording paper rotated by the drive system of the copying machine, is connected to a cam 22. are coaxially arranged facing the recording paper P1 in the paper feed cassette 1. Further, above the half-moon roller 21, a recording paper P1 that has been conveyed from the paper feed cassette 1 and reversed through a first paper feed roller and a guide plate (none of which are shown) is fed to the image forming process area. A second feeding roller 23 is provided that feeds paper so as to match the toner image formed on the photosensitive drum.

The second feeding roller 23 is composed of a driving roller 23a and a driven roller 23b that rotates in pressure contact with the driving roller 23a.As shown in FIG. Drive system 24, 2
gear 26 and spring clutch 2 rotated by
7, it is attached to a rotating shaft 29 coupled to a ring 28 which rotates integrally with the ring 28.

Further, on the right side of the second paper feed roller 23, a first paper feed roller 41 is provided as a manual paper feed means for conveying the manually inserted recording paper P2 to the second paper feed roller 23. It is being

The first paper feed roller 41 is composed of a drive roller 41a and a driven roller 41b that rotates while being pressed against the drive roller 41a by an elastic member (not shown).The drive roller 41a is connected to the drive system of the copying machine. (not shown)
On the other hand, the driven roller 41b is configured to be able to move in a direction perpendicular to the driving roller 41a, that is, upwardly, and retreat from the pressed state.

These half-moon roller 21, second paper feed roller 23, and first paper feed roller 4 of manual feed recording paper P2.
Each member for controlling the action of the roller groups 21, 23 and 41 according to the present invention is disposed on the substrate supporting each end of the first roller.

That is, the tension spring 5 is attached to the support shaft 51 on the board.
A bell crank 52, which is a first actuating member, is rotatably mounted, and has a tip 52a pressed against the outer circumferential surface of the cam 22 by a pin 52a and a pin 52b protruding from the other end.

Further, the other support shaft 54 on the board has a tip 55a.
is a pin 4 protruding from the end surface of the driven roller 41b.
A swinging lever 55, which faces the bell crank 52 with a slight gap between the bell crank 52 and a bifurcated portion 55b at the other end sandwiching the pin 52b, is rotatably mounted to follow the bell crank 52. In addition, the swing lever 5
5 is provided with a locking protrusion 55c which will be described later.

Furthermore, a locking lever 62, which is a second operating member biased clockwise by a tension spring 63, is rotatably attached to the other support shaft 61 on the board. A protrusion 62a on the locking lever 62 engages with a recess in a cutout wheel 30 fitted onto the spring clutch 27 shown in FIG. 6
2b occupies a position within the operating range of the pressing member 64 actuated by the control system of the copying machine. The pressing member 64 is actuated by a signal from a drive system that adjusts timing with the photosensitive drum for image formation, and is driven by a solenoid or a cam.

Further, a foot lever 71 is rotatably fitted onto the support shaft 61 separately from the locking lever 62, and biased clockwise by a torsion spring 72 hooked between the locking lever 62 and the locking lever 62. However, the end portion 71c comes into contact with a stop pin 73 on the board, thereby stopping it. Also, the hook part 7 at the other end
1a faces a position where the protrusion 55c of the rocking lever 55 can be locked, and the bent portion 71b formed at the other end can be locked by counterclockwise rotation of the locking lever 62. It occupies a position where it comes into contact with the stop lever 62.

The paper feeding device according to the present invention is constructed as described above, and its operation will be explained next.

In FIG. 2, the paper is being fed manually, and the half-moon roller 21 is stationary. Therefore, when the drive roller 41a of the first paper feed roller 41, which is a manual paper feed means, is rotated counterclockwise by the drive system of the copying machine, the recording paper P2 is transferred to the drive roller 41a.
The sheet is conveyed under pressure by the driven roller 41b and reaches the second feed roller 23, and the image is formed after the timing is adjusted by the counterclockwise rotation of the drive roller 23a started by the control system of the copying machine. is fed to the process area.

On the other hand, when the paper feeding mode is switched to the paper feeding cassette, the half-moon roller 21 rotates counterclockwise by the drive system of the copying machine in FIG. The circumferential surface of the recording paper P1 comes into contact with the recording paper P1 stacked at the top of the paper feed cassette 1, and the recording paper P1 is about to be carried into the copying machine. At the same time, the tip 22a of the cam 22 raises the tip 52a of the bell crank 52, which is the first actuating member, so the bell crank 52 rotates clockwise against the tension spring 53. The bell crank 52
Following the rotation of the pin 52b, the swinging lever 55 is forcibly rotated counterclockwise, and the tip 5
5a is the driven roller 4 in the first paper feed roller 41
Since the pin 42 of 1b is raised, the driven roller 4
1b is released from the pressure contact of the drive roller 41a and moves away. That is, when the recording paper P1 is taken out and supplied from the paper feed cassette 1, the recording paper P1 is manually fed.
2 becomes impossible to transport.

Further, by counterclockwise rotation of the swing lever 55, the protrusion 55c of the swing lever 55 pushes up the foot lever 71, and then engages with the hook portion 71a of the foot lever 71 by the action of the torsion spring 72. Since the state shown in FIG. 3 is reached, even if the half-moon roller 21 further rotates in the counterclockwise direction and completes one rotation, the driven roller 41b remains in the driving roller 41.
It maintains a state further apart than a.

In other words, while the recording paper P1 in the paper cassette is being fed to the copying machine taken out from the paper cassette, it is impossible to transport the recording paper P2 manually, and as mentioned above, it is impossible to manually feed the recording paper P2. Since the recording paper does not overlap even when paper is fed,
There is no possibility of feeding defects such as jams.

Further, in the present invention, the separated state of the first paper feed roller 41 is maintained until the second paper feed roller 23 starts operating.

That is, in FIGS. 3 and 4, the gear 26 rotated by the drive system 24, 25 of the copying machine
tries to rotate the spring clutch 27 together, but the notch wheel 30 fitted onto the spring clutch 27 is locked by the protrusion 62a and cannot rotate, so a frictional force is generated between the spring clutch 27 and the outer peripheral surface of the spring clutch 27. occurs, so that the inner diameter of the spring clutch 27 is expanded and the gear 2
6 is in a state of idling. Therefore, the drive roller 23a, which is attached to the rotating shaft 29 connected to the spring clutch 27 via the ring 28, is kept stationary.

Next, the pressing member 64 is actuated by a signal from the control system of the copying machine that has adjusted the paper feeding timing, and presses the tip 62b to move the locking lever 62, which is the second actuating member, against the tension spring 63. When the protrusion 62a is rotated counterclockwise, the protrusion 62a is disengaged from the notched wheel 30, so that the notched wheel 30 becomes free and does not cause any friction with the spring clutch 27. Therefore, the gear 26 and the ring 28 are each tightened by the spring clutch 27 and rotate as a unit to rotate the drive roller 23a and feed the recording paper P1 to the image forming process area.

At the same time, the locking lever 62 presses the bent portion 71b of the foot lever 71 and rotates the foot lever 71 counterclockwise against the torsion spring 72.
c will be released from the locked state. On the other hand, at this point, the half-moon roller 21 and the cam 22 are 1
Since it is stationary at the position shown in FIG. 2 after the rotation, the swing lever 55 is rotated clockwise by the action of the bell crank 52 which is rotated counterclockwise by the tension spring 53. becomes. As a result, the driven roller 41b has an elastic member (not shown)
, and is brought into contact with the drive roller 41a again.

Thus, according to the present invention, from when the recording paper P1 in the paper feed cassette 1 begins to be unloaded by the half-moon roller 21 until it starts being fed to the image forming process area by the rotation of the second paper feed roller 23. , the manual paper feeding function will be stopped. Therefore, even if manual paper feeding is performed inadvertently while the recording paper P1 is being fed from the paper feed cassette 1, feeding troubles due to overlapping of the recording paper can be prevented with an extremely high probability.

[Effect of idea]

According to the present invention, by adding an extremely simple device, it is possible to stop the manual paper feed function from the start of feeding recording paper from the paper feed cassette until the start of the second paper feed roller. Therefore, the second paper feed roller and the first paper feed means
A paper feeding device for a copying machine has been provided which operates with extremely high copying efficiency when the length of the conveyance path between the paper feeding roller and the paper feeding roller is longer than the length of the recording paper.

This paper feeding device is extremely effective in preventing recording paper feeding troubles caused by careless handling.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram showing the paper feeding mechanism of a copying machine, Figure 2
The figure is a state diagram of manual paper feeding in the paper feed device according to the present invention, FIG. 3 is a state diagram of paper feeding by the paper feed cassette, and FIG. 4 is a cross-sectional view of main parts showing the drive system of the second paper feed roller. . 1... Paper feed cassette, P1, P2... Recording paper,
21...Half-moon roller, 22...Cam, 23...Second paper feed roller, 23a...Drive roller, 26...
Gear, 27... Spring clutch, 28... Ring,
29... Rotating shaft, 30... Notch wheel, 41... First
Feeding roller, 41a... Drive roller, 41b...
Driven roller, 52...bell crank, 55...swing lever, 62...locking lever, 64...pressing member, 71...foot lever, 71a...hook part, 7
1b...Bending part.

Claims (1)

[Scope of Claim for Utility Model Registration] A cassette feeding means for feeding and conveying stacked recording paper, and a manual feeding means for manually feeding the recording paper, and a method for producing the stacked recording paper or manual paper feeding. In the paper feeding device of a copying machine, the copying machine is equipped with a second paper feeding roller that feeds the recorded paper so as to match the toner image formed on the photoreceptor drum. A feeding roller for feeding, a cam member provided integrally with the feeding roller, and a first cam member that swings due to the operation of the cam member.
an operating member, a manual paper feed roller of the manual paper feed means which is opened and inoperable by the operation of the first operating member, and a manual paper feed roller of the manual paper feed means that is engaged with a part of the first operating member to set the operating position. a foot lever for holding, and the second
a second operating member having a protrusion for driving and stopping the paper feed roller; the manual paper feed roller is inactive while the cassette paper feed means is in operation; A paper feed device for a copying machine, characterized in that the leaf lever is disengaged when the second paper feed roller is started, and the manual paper feed roller is released from inoperation.