JPH0529488Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a device for separating recording paper electrostatically adhered to a photoreceptor in electrostatic recording machines such as electronic copying machines and printers. It is something.

(b) Prior Art A recording paper separating device equipped with a separating claw for separating recording paper electrostatically attached to a photoreceptor is well known (for example, the electronic copying machine manufactured by Sanyo Electric Co., Ltd. (used in the machine "SFT-600").

The tip of this conventional separating claw is in sliding contact with the photoreceptor at all times, and when the recording paper is separated, the surface on the side to which unfixed toner is attached comes into sliding contact with the separating claw.
The separation claw is provided near one side edge of the photoreceptor.

(c) Problems to be solved by the invention As mentioned above, in the conventional technology, the separating claw is provided near one edge of the photoreceptor, so the recording paper is always fed with one side edge as a reference. , the photoreceptor is
The part from the center to the separation claw side is prone to wear and is difficult to wear uniformly.

Furthermore, it is inevitable that an image cannot be formed on the portion that the separation claw contacts, and it is not possible to form an image over the entire area of the recording paper.

(d) Means for solving the problem The present invention has two positions: a first position where the tip contacts the surface of the photoreceptor, and a second position spaced downstream along the moving direction of the recording paper. This recording paper separating device is characterized in that it is provided with a separating claw that can reciprocate between the first and second positions, and means for holding the separating claw at the second position.

(e) Operation The downstream edge of the recording paper is separated from the photoreceptor with the separating claw in the first position, and then the separating claw moves to the second position on the downstream side. Then, the downstream end of the recording paper extends downstream from the photoreceptor and curves downward due to its own weight. Therefore, the recording paper is sequentially separated from the photoreceptor without coming into contact with the separating claw.

(F) Embodiment Each drawing shows an embodiment of the present invention, and
The figure is a front view, FIGS. 2 and 3 are partially enlarged front views showing different states of the separating claw, and FIG. 4 is a side view showing the photosensitive drum and the separating claw.

In these figures, reference numeral 1 denotes a cylindrical photoreceptor drum, the circumferential surface of which is coated with a photoconductive material such as amorphous silicon, and an electrostatic latent image and a toner image are formed on this photoreceptor drum 1. ing. A transfer corotron 3 is provided at the bottom of the photoreceptor drum 1 for transferring the toner image on the photoreceptor drum 1 onto the recording paper 2 .

A pair of paper feed rollers 4, 4 for feeding the recording paper 2 are pressed against each other on the upstream side of the transfer corotron 3 along the paper feeding direction. Further, on the downstream side of the transfer corotron 3, a separating claw 5 for separating the recording paper 2 from the photosensitive drum 1 is provided. Each of the separation claws 5 has a recess 6 formed at its tip, and is fixed to two support rods 7 and 8 extending parallel to the rotational axis of the photosensitive drum 1. Near both ends of the support rods 7, 8 are guide holes 1 formed in the chassis 9, 9 (FIG. 4).
0 and 10 so as to be slidable. The guide hole 10 extends downstream from the vicinity of the photosensitive drum 1 along the paper feeding direction, and the downstream end thereof is located slightly above. Although not shown, a weak spring is stretched between the separation claw 5 and the chassis 9 to bias it toward the upstream side.

Further, the leftmost end (the fourth
A recess 11 is formed in the lower part of the one 5a shown in the figure, and a lever 12 having an "inverted F" shape is attached to the lower part of the separating claw 5a so as to be able to swing freely about the support shaft 13. . An arm 12 on the downstream side of the lever 12
A tension coil spring 14 is stretched between the lever 12 and the chassis 9 to bias the lever 12 clockwise (FIG. 1). Also lever 12
The free end of the downstream arm 12a is provided with a protrusion 15 which can be engaged with the recess 11 in the lower part of the separating claw 5a.

16, 17, 18 are paper feed guides, 19,
Reference numeral 19 denotes a pair of heat rollers for fixing unfixed toner on the recording paper 2.

After the recording paper 2 is fed by the paper feed rollers 4, 4 and the toner image is transferred by the transfer corotron 3, the downstream edge of the recording paper 2 is attached to the separating claws 5. It comes into contact with the recess 6 in the tip and is separated from the photoreceptor drum 1. At this time, the separation claws 5 move downstream along the guide holes 10, 10. A recess 11 at the bottom of the separating claw 5a
When the protrusion 15 of the lever 12 is engaged, the separation claw 5a is locked at that position (the first
(See figure 3).

When the separation claws 5 are located on the downstream side, the recesses 6 at their pointed ends point slightly downward, so the downstream end of the recording paper 2 separates from the recesses 6 and moves downward under its own weight. (See Figure 3). When the recording paper 2 moves downward in this manner, the toner-attached surface (upper surface) of the recording paper 2 separates from the separation claws 5 .

When the recording paper 2 is on the lever 12, the arm 12b on the upstream side of the lever 12 is pushed down by the lower surface of the recording paper 2, and the protrusion 15 on the downstream side and the recess of the separating claw 5a are pressed down. 11 is engaged, but
When the recording paper 2 is completely transferred, the lever 12 is biased clockwise by the tension coil spring 14, and the protrusion 15 is removed from the recess 11. Then, the separation claws 5 are returned to their initial positions by a spring (not shown).

Next, the second recording paper 2 is separated from the photosensitive drum 1 through the same process as described above.

(g) Effects of the invention In the present invention, since the separating claw can move back and forth along the moving direction of the recording paper, it is possible to provide the separating claw at a portion corresponding to the image forming area. Therefore, the recording paper can be reliably separated from the photoreceptor.

Furthermore, it becomes possible to form an image over the entire area of the recording paper.

Furthermore, since the recording paper can be fed with the center as a reference, the photoreceptor will be worn uniformly, and the life of the photoreceptor can be extended.

[Brief explanation of drawings]

Each of the drawings shows an embodiment of the present invention.
The figure is a front view, FIGS. 2 and 3 are partially enlarged front views showing different states of the separating claw, and FIG. 4 is a side view showing the photosensitive drum and the separating claw. 1... Photosensitive drum, 2... Recording paper, 5... Separation claw, 6... Recess, 7, 8... Support rod, 10...
Guide hole, 12...Lever.

Claims (1)

[Claims for Utility Model Registration] In a separating device for separating recording paper adhered to a photoreceptor, there is provided a separating device for separating recording paper adhering to a photoreceptor, which comprises: a separating claw that moves from a first position to a second position where the end is engaged with the tip and then disengaged from the end; 2 higher than 1 position
a guide means for reciprocating sliding guidance at the position, and a lever lever whose one end is brought into contact with the paper surface of the recording paper passing through, and whose other end is locked to the locked portion of the separating claw that has been moved to the second position. and a biasing means for rotationally biasing the lever in the unlocking direction, and releasing the locked state of the locked portion and the other end of the lever after the recording paper passes, and A recording paper separation device characterized by returning a separation claw to a first position.