JPH0423263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine having an improved transfer paper transport system.

Generally, in the transfer paper transport path of a copying machine, the transferred transfer paper often becomes jammed (so-called paper jam), and in this case, the jammed transfer paper (hereinafter referred to as "jammed paper") is Needs to be removed.

Conventionally, in order to make it possible to remove and discharge this jam paper, a guide plate forming a transfer paper conveyance path is retracted from its guide position, but with this method, if the guide plate is sufficiently retracted, This increases the amount of wasted space, making the copying machine larger and the evacuation mechanism more complicated. It has disadvantages such as being difficult to pull out, and at the same time there is a risk of damaging other nearby parts.

The present invention has been made to eliminate the above-mentioned drawbacks, and can create a large space with a simple evacuation mechanism without wasting much space in order to take out the jammed paper when a jamming problem occurs. , normally the transfer paper can be transported reliably. A copying machine equipped with a transfer paper conveyance device is provided.

An example of implementing the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a photosensitive transfer drum, which is rotated in the direction of the arrow, charged by a charging electrode (not shown), and then exposed to light on the original image.The electrostatic latent image thus formed is developed by a developing device (not shown). A toner image is formed. In the present invention, in the area where the toner image on the drum 1 is to be transferred to the transfer paper, the drum 1 is located in the area where the toner image on the drum 1 is to be transferred to the transfer paper, when viewed from the conveyance direction of the transfer paper fed from the paper feed section of the copying machine as shown by arrow A. A guide plate 2 for guiding the toner image into contact with the drum 1, a transfer pole 3 for transferring the toner image onto the transfer paper, a first removal electrode 4 for subsequently separating the transfer paper from the surface of the drum 1, and a first removal electrode 4 provided on the downstream side thereof. The four members of the transfer paper feeding mechanism 5 are assembled in this order into a pair of opposing side plates 6 to form an integrated conveyance unit 7. The transfer pole 3 and the first removal electrode 4 can be attached and detached via guide means (no reference symbol) such as a rail provided between the side plates. Further, as shown in the figure, the conveyance path created from the left end of the guide plate 2 to the transfer paper feed mechanism 5 is configured to be substantially horizontal. The first removal electrode 4 is particularly useful when using thin transfer paper. In the illustrated example, the transfer paper feeding mechanism 5 includes a plurality of rubber belts 8 that are moved along a moving path including a flat upper surface moving path, and a drive roller 9 on which the rubber belts 8 are mounted.
and a suction box 10 for suctioning the transfer paper placed on the rubber belt 8 on the upper surface movement path. The shaft 9' of the drive roller 9, which is located at one end of the conveyance unit 7, that is, the upper part on the downstream side and protrudes from the outer surface of the side plate 6, is pivotally supported by the frame side plate 11 of the copying machine. 7 is supported rotatably around the shaft 9'. Further, a rotary shaft 12 is rotatably provided on the machine frame side plate 11 at a position below the transport unit 7 and shifted to the left with respect to the center of the drum. A cam lever 13 protruding from the cam lever 13 is fixed, and a support member 15 having a leaf spring 14 is fixed to the lower edge of the side plate 6 so as to be located directly above the cam lever 13. By raising the cam lever 13, the transport unit 7 can be raised to a predetermined position against gravity, and an operating lever (not shown) is individually installed at the end of the rotating shaft 12. On the other hand, the side plate 6 is formed with a protrusion 16 that protrudes upward at the upstream side of the conveyance unit 7, that is, at the end of the conveyance unit opposite to the transfer paper feeding mechanism, and the upper end surface of this protrusion 16 is formed. Position regulating member 17 to be abutted
is fixed to the machine frame side plate 11. Then, when the cam lever 13 is in an upwardly erect state, the protrusion 1
6 comes into contact with the position regulating member 17, the plate spring 14 is slightly displaced, and the cam lever 13 is moved through the support member 15.
This ensures that the transport unit 7 is supported in a fixed state. As is clear from the figure, the length from the transfer electrode 3 to the rotation fulcrum, ie, the shaft 9', is longer than the length from the electrode 3 to the engaging portion, ie, the protrusion 16. In other words, since the shaft 9' is located away from the drum, a large space can be created when the unit falls, and since the protrusion 16 engages near the drum, the position of the electrode relative to the drum surface can be accurately set. Become.

Note that the cam lever 13 is attached to the rotation shaft 12.
It is preferable to provide a spring so that the spring is restrained in an upright state. Reference numeral 18 indicates a second removal electrode for removing residual charges on the drum 1, and reference numeral 19 indicates an upper guide plate fixed to the position regulating member 17.

In the copying machine of the present invention, since the transfer paper conveying device is configured as described above, when necessary or when a jam occurs in the transfer paper, if there is a spring, the rotation shaft can be moved against the spring via the operation lever. 12 and tilt the cam lever 13 as shown in FIG. 2, the entire conveying unit 7 rotates about the shaft 9' due to gravity. As a result, a wide space can be formed between the transport unit 7 and the drum 1, etc., and the jam paper 20 can be taken out and removed very easily through this space.

Note that it is of course possible to provide an independent pivot shaft without also using the shaft 9'.

In addition, in the present invention, the above-mentioned dropping and rotation of the transport unit 7 and its return can be performed only by operating the operating lever, and when the transport unit 7 is returned, the protrusion 16 of the side plate 6 always controls the position due to the restraining force of the leaf spring 14. Since it is maintained in a state in which it is brought into contact with the member 17, the conveyance unit 7 can be kept in a predetermined state, and therefore the transfer pole 3, whose distance from the drum 1 is strictly determined, etc. Each part can always be kept in its optimum condition.

As described above, according to the present invention, with an extremely simple configuration, the entire transport unit can be retracted to form a wide space, and jam paper can be easily removed, and moreover, even when restored, it is possible to Great benefits such as always reproducing the optimum state can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory side view of a copying machine according to the present invention, particularly the transfer paper conveying device portion, and FIG. 2 is an explanatory side view of its operation. 1...Photosensitive transfer drum, 2...Guide plate, 3...
...Transfer pole, 4...First removal electrode, 5...Transfer paper feeding mechanism, 6...Side plate, 7...Transportation unit, 11...
... Machine frame side plate, 12 ... Rotating shaft, 13 ... Cam lever, 14 ... Leaf spring, 16 ... Projection, 17 ... Position regulating member, 18 ... Second removal electrode, 20 ... Jam paper.

Claims (1)

[Claims] 1. The transfer paper conveyance device of the copying machine that conveys the transfer paper separated from the transfer drum is composed of a belt conveyance means equipped with a suction means, and the belt conveyance means is rotatable about the transfer paper discharge side as a fulcrum, and A transfer paper conveyance device for a copying machine, characterized in that a transfer paper receiving side can be moved between a position closer to a transfer drum and a position away from the transfer drum by operating a supporting operation member provided on the paper receiving side.