JPS6131013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette attaching/detaching device for a copying machine.

Conventionally, when the paper feed roller pressing device was installed in the main body of the copying machine, the operation was complicated because the release lever had to be operated to release the cassette roller pressure before attaching or removing the cassette. However, especially when multi-stage cassettes are used, the operation becomes very complicated and may cause erroneous operation.

SUMMARY OF THE INVENTION The present invention provides a leverless attachment/detachment mechanism aimed at simplifying operations when attaching and detaching a cassette. In order to create a mechanism that does not require lever operation when attaching and detaching the cassette, there are two problems that must be solved. One of the challenges is how to avoid leaving the top paper in the cassette in the copying machine, which comes into contact with the paper feed roller that rotates only in the feeding direction when the cassette is removed. Another issue is how to insert the cassette into the pressing device that protrudes above the cassette in case the paper feeding roller pressing device is installed in the main body of the copying machine. be. The present invention is particularly directed to providing an apparatus that solves the latter problem.

The present invention will be explained below with reference to illustrated embodiments.

Figures 1 and 2 show the first embodiment, with Figure 1 showing the main parts of the cassette insertion stage (or extraction stage), and Figure 2 A, B, and C showing the order of insertion, attachment, and extraction. ing. First, in the state shown in FIG. 1 and FIG. A locking lever 21, which protrudes inwardly through the lever 11 and extends along the cam surface 13 at the tip of the lever 11, rotates in the direction of the dashed arrow, and locks the tip 32 of the pressing lever 31 with its hook portion 22. In this state, press lever 3
1 is at the end of rotation in the direction of the solid arrow, and the lever 3
1 via a shaft 34 fixed to a boss 33 of the shaft 3
The pressing member 35 fixed to the cassette holder 5 is retracted from the opening 7 of the cassette holder 5 and does not protrude above the cassette receiving surface. Therefore, the insertion operation of the cassette 1 under such conditions can be carried out without any problem. When the cassette 1 is further pushed in from this state (FIG. 2 b), the end front plate 4 will immediately push the detection part 12 of the swing lever 11.
The swing lever 11 rotates in the direction of the solid line arrow against the spring 14, and the cam surface 13 at the tip pushes the side surface of the lock lever 21, causing the lever 21 to rotate in the direction of the solid line arrow. Therefore, the hook portion 22 releases the tip 32 of the pressing lever 31, so that the lever 3
1 is rotated in the direction of the dashed arrow by the bias of the spring 36, and the pressing member 35 passes through the opening 7 of the cassette holder 5 and enters the opening 2 in the bottom of the cassette via the shaft 34. The bottom plate 8 is pressed by the force of the spring 36, and the laminated paper on the bottom plate is brought into pressure contact with the paper feed roller 51. Next, when the operation moves on to remove the cassette 1 (FIG. 2C), the pressing member 35 is pushed down by the edge 3 of the opening 2 in the bottom of the cassette, and this movement moves the pressing lever 31 through the shaft 34 as shown in the solid line. It will be rotated in the direction of the arrow. On the other hand, since the detection part 12 is no longer pressed due to the retreat of the cassette 1, the swinging lever 11 is rotated again in the direction of the broken line arrow by the spring 14, and as a result, the locking lever 21 is moved onto the tip cam surface 13 of the swinging lever 11. The hook portion 22 of the lever 21 receives the tip 32 of the pressing lever 31 which has finished rotating in the direction of the solid line arrow as explained earlier, and moves to the position shown in FIG. 2A. Returning to the state shown, the pressing member 35
The cassette is sunk from above the cassette holder 5 and waits for the next cassette insertion operation.

FIG. 3 shows the reference embodiment in the order of its operation with A and B. First, when the cassette 1 shown in FIG. Rotate 11' counterclockwise. This movement also causes the pressing lever 31', which is pivoted to the shaft 16, to rotate counterclockwise via the spring 36' attached to the lever 11', and the roller 37 at the tip of the lever 31' is moved to the bottom of the cassette. It is inserted into the opening 2 and the bottom plate 8 is pressed upward by the tension of the spring 36'. Therefore, the sheets stacked in the cassette 1 come into pressure contact with the paper feed roller 51, and the paper feed roller 51 waits for a paper feed signal and sequentially feeds the topmost paper to the registration rollers, etc. Next, when the cassette 1 is removed, the roller 15 at the free end of the swing lever 11' no longer has the pressing force of the cassette end face 4, so the swing lever 11' is further moved by the spring 36'. 11', the pressing lever 31' is rotated clockwise by its own weight or by other means such as a spring, and the pressing lever 31' first comes into contact with the stopper 9, and then the lock pin 21' on the swing lever comes into contact with the stopper 9. When it comes into contact with the pressing lever 31', the biasing force of the spring 36' is released and stopped. In this position, the tip roller 37 of the pressing lever 31' is retracted from the surface of the cassette receiver 5, so that there will be no hindrance to subsequent removal of a cassette or insertion of a new cassette.

It should be noted that, other than the leverless mechanism according to the present invention, it is more desirable to use it in conjunction with the paper feed roller-related solution described at the beginning, so this will be supplementarily explained below. FIG. 4 shows an example of this, in which the other end of a member 52 that rotates when pressed against the end surface 4 of the cassette 1 is connected to a guide lever 53 with a guide roller 54 disposed on the paper feed roller shaft of the paper feed roller 51. are doing. Therefore, when the cassette 1 is installed, the rotating member 52 rotates clockwise, which rotates the guide lever 53 counterclockwise to separate the guide roller 54 from the paper on the cassette, thereby separating the paper feed roller 51 and the cassette. The paper on top makes contact and maintains the paper feeding state. Next, when the cassette 1 is removed, the rotation lever 52 is released from pressure, so the guide lever 53 is rotated clockwise by the spring 55, and the guide roller 5
4 in contact with the paper and separate the paper feed roller 51 from the paper on the cassette. Therefore, when the cassette is removed, it is possible to prevent the topmost paper from remaining inside the copying machine due to the paper feed roller. Another solution is to separate the paper feed roller from the drive mechanism using an electromagnetic clutch that is activated when the cassette is inserted or removed, so that it can rotate in both directions so that no resistance is applied to the top paper when the cassette is removed. However, the above explanation is merely an example of application to the present invention, and does not affect the technical content of the present invention.

As described above, according to the present invention, the swinging member and the pressing member simply operate in conjunction with the attachment/detachment operation of the cassette to press or release the laminated paper in the cassette without using an operating lever. This not only makes it possible to handle the paper feed easily and without error, but also greatly simplifies this type of paper feed mechanism.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts showing one embodiment of the present invention, Fig. 2 A, B, and C are explanatory diagrams showing its operating state, and Fig. 3 A and B show operating states of a reference embodiment. The explanatory diagram, FIG. 4, is a diagram showing a preferable example applicable to the present invention. 1...Cassette, 4...End face (front plate), 11,1
1'... Swinging member (swinging lever), 21... Lock lever, 31, 31'... Pressing lever, 35... Pressing member, 51... Paper feed roller, 9... Stopper.

Claims (1)

[Claims] 1 A swinging member 11 that operates so as to be pressed by the front plate 4 of the cassette 1 to retreat from the cassette insertion path, and to be released from the pressure by the front plate and positioned within the cassette insertion path. , the laminated paper in the cassette is moved to the paper feed roller 5 in conjunction with the backward movement of the swinging member.
1. A cassette attachment/detachment device for a copying machine, comprising a pressing member 35 which swings to press the cassette toward the bottom of the cassette, and which swings to release the pressure when pressed against the bottom surface of the cassette.