JPS61128273A - Device for separating and conveying copying paper - Google Patents

Abstract

PURPOSE:To separate smoothly copying paper from a photosensitive body without distorting the paper by pressing successively the copying paper from a separating belt side toward a guide plate by means of plural spurs. CONSTITUTION:The separating belt 20 is installed to extend in a conveying direction so as to contact slidingly with one end of the transfer region A of a photosensitive drum 1. One end thereof is fitted to a pin 21 and a sliding contact pressure is obtd. by means of a tensile spring 22 connected to the other end of the belt. The guide plate 23 guides the copying paper P to a fixing device 10. Plural pieces of spur arms 31 which support turnably the spurs 30 are provided approximately at equal intervals to the top end positioned near the drum 1. the arm 31 are oscillatable around a fulcrum shaft 32 installed in parallel with the drum 1. The spurs 30 are kept energized at all times in the direction spacing from the plate 23 by means of torsion springs 33 wound around the shaft 32.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for separating copy paper onto which one image has been transferred from a photoreceptor and conveying it to the next process.

BACKGROUND TECHNOLOGY In general, this type of separating and conveying device employing various methods has been proposed.One of them, as shown in FIG. A string-shaped separation belt ■ is brought into sliding contact, and the copy paper (Pl) is passed through the transfer area of the photosensitive drum (1) so that one end of it comes into sliding contact with the separation belt ■, and is separated from one end of the copy paper (P). In some cases, the copy paper (Pl) is separated along the belt (2) and transported to the next process while being guided by a guide plate installed on the exit side of the transfer area (5).

This separation belt method has the advantage that there is no risk of damaging the surface of the photoreceptor on which the image is formed, unlike the method using separation claws, and it does not require large-scale equipment, unlike the air jet method.

Problems to be Solved by the Invention However, in this method 1, the separation starts from one end and the effect gradually spreads to the other end. As shown in the figure, the copy paper (P) is twisted, the toner image is disturbed, or jams occur.

For this reason, in the past, people used their own strength to set the conveyance path to the next stage of flea cutting to be long so that the copy paper (Pl) could be laid flat, but in this case, the equipment became large and This method has the disadvantage that it cannot handle small-sized copy paper.

The present invention aims to solve the above-mentioned disadvantages.

In order to solve the above-mentioned problems, the present invention adopts the separation belt method, and includes a plurality of spurs arranged in parallel near the photoreceptor (towards the guide member so as to be able to descend toward the guide member), and a copy paper under the spurs. Immediately after the leading end passes, the apparatus includes a driving means for sequentially lowering the spur from the separation belt side.

Function The present invention separates and conveys the copy paper separated by the separation belt by pressing it sequentially from the separation belt side toward the guide plate using a spur.

Embodiment FIG. 2 shows the internal structure of a copying machine equipped with an embodiment of the transfer paper separation and conveyance device according to the present invention.

To briefly explain the copying operation, a photosensitive drum (1) provided in the center of the main body can be rotated clockwise, and a charger (2) (a predetermined amount of charge is formed). The right side (scanning optical system (3) scans and exposes the image of the document placed on the document glass on the top of the main body, and the electrostatic latent image formed here is transferred to a magnetic brush developing device (3). 4).On the other hand, the copy paper is stored in a paper feed cassette (5), and is turned into a toner image by a paper feed roller (6).
) is fed one by one from the top layer based on the counterclockwise rotation of the paper feed roller (6), reversed around the paper feed roller (6), conveyed to the left by a pair of conveyor rollers (7), and transferred to a pair of timing rollers. (8) leads to the transfer area (~).

Here, an electric field generated by a transfer charger (9) is applied from below to the copy paper, and the toner image is transferred to the copy paper.

At this time, the copy paper is brought into close contact with the photoreceptor drum (1) by an electric field, but is separated from the leading edge by a separation belt (described in detail below), and guided on a guide plate by the fixing device (10).
The toner image is fixed by the heating action of the fixing roller tin, +121, and is discharged onto the tray (141) by the discharge roller.

Meanwhile, the photoreceptor drum (1) continues to rotate clockwise, residual toner is removed by a blade cleaner device (151), residual charge is erased by an eraser lamp (16), and the drum is prepared for the next copying. .

Next, the separation and conveyance apparatus of the present invention will be explained using FIGS. 1 and 3.

In the figure, the separation belt ■ is installed extending in the conveying direction so as to be in sliding contact with one end of the transfer area (~) of the photoreceptor drum (1), and one end is attached to a pin (2t+) and connected to the other end. The sliding contact pressure is obtained by a tension spring (2).The guide plate guides the copy paper (P1) to the fixing device (10) and is installed at the lower part of the exit side of the transfer area (-).

Above the guide plate, a plurality of spur arms (31J) that rotatably support a spur (sword) are provided at the tip located near the photoreceptor drum (1), and these spur arms (31J) are arranged at approximately equal intervals. The spur arm (311) is swingable around a fulcrum shaft (■) installed parallel to the photoreceptor drum (1), and
A torsion spring 03) wound around the fulcrum shaft country constantly urges the spur ■ in a direction away from the guide plate (23). Specifically, in this embodiment, the width of the guide plate is 302, and three spurs are arranged at intervals of 7.5.

Above the spur arm (31) is a guide plate (
Two drive shafts (34) are installed parallel to the fulcrum shaft for lowering the photoreceptor drum (1) toward the photoreceptor drum (1). The upper surface (31
It has a fixed elliptical cam country that slides into contact with a). The one-turn clutch ■ transmits rotational force to the drive shaft (to) when the claw part (39a) of the locking lever ■ is separated from the notch (37a) on its outer periphery, and the locking lever country is By turning on the solenoid (column) after a predetermined period of time from the time when the timing roller pair (8) described above starts to rotate, the solenoid (column) rotates around the fulcrum (39b) and its claw portion (37
a) is provided so as to be separated from the one-turn clutch (2). In addition, the elliptical cam (to) is designed so that when the drive shaft (to) is stopped, all the spurs are the most distant from the guide plate, and when the drive shaft (to) is rotating, The spurs (3) on the separation belt ■ side are fixed at different angles so that they descend sequentially toward the guide plate -.Actually, the angular difference between the elliptical cams (toward) at both ends is 180°. Also, its angle and drive axis (
The relationship between the rotation speed and the rotation speed is as follows:
In the case of 200 fnm/Sec, the next spur arm 3D is 0
．． It is set to swing after 1 to Q, 5 seconds.

Furthermore, on the installation side of the separation belt ■, there is a separation roller □□□ that is driven to rotate clockwise at a circumferential speed equal to the conveyance speed;
A separation roller (2) is installed which is in pressure contact with the roller and can be driven to rotate.

In the above configuration, copy paper (P) of any size is fed based on the installation side of the separation belt ■.

The separation side end (Pl) slides into contact with the separation belt ■ in the transfer area ^, is separated from the photosensitive drum (1) immediately after passing through the transfer area, and is separated from the separation roller (to) and the separation roller ■ Semi-forcibly slides onto the guide plate. The other end of the copy paper (P) is curved away from the guide plate due to the electrostatic attraction force to the photoreceptor drum (1), but after a predetermined time after the tying roller (8) starts rotating, the solenoid (By turning on the column, the first spur arm (3) on the separation belt
11 descends and pushes the tip of the copy paper (Pl) on the separation belt ■ side, which is relatively less curved, toward the guide plate, and then the second spur arm (31) descends and Copy paper (PI) curved or reduced by arm (3υ
The spur arm 1311 is then lowered in the same way, so that the copy paper (ladle) is gradually pushed down from the side of the separation belt, which is relatively less curved, so it easily slides into contact with the guide plate, and in the next process. The image is transported to a certain fixing device 101.

Fig. 4 shows a modification of the driving means for lowering the spur ■ toward the guide plate.
Spur arm (41) that rotatably supports the spur ■ at the tip
A plurality of spur frames (47J) that swingably support this spur arm (4υ) are provided side by side. The spur arm (411) is guided by a tension spring (
441, the spur ■ is always urged in the direction away from the guide plate, and maintains the state in contact with the stopper (42a), and during conveyance, the spur (451) provided on the spur frame (@) It is said to be able to swing toward the board.

In the above configuration, after the end of the copy paper (Pl) is separated by the separation belt ■, by sequentially turning on the solenoid (a) from the separation belt ■ side, the copy paper (P) is guided along the guide plate. Furthermore, the effect can be improved by adjusting the spur ■ in the width direction of the copy paper CP).

In this embodiment, a plurality of spurs (2) are arranged parallel to the photoreceptor drum (1), but the invention is not limited to this. ) may be arranged in parallel so that the distance between the spur fields is wide.

Effects As is clear from the above explanation, the present invention uses a plurality of spurs to press the copy paper sequentially from the separation belt side toward the guide plate, so the copy paper is not distorted and the photoreceptor can be separated smoothly from
This has various effects such as preventing image disturbances, jams, etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a separating and conveying device that is an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing a copying machine to which the present invention is applied, and FIG. 3 is a schematic configuration diagram showing an embodiment of the present invention. , FIG. 4 is a schematic configuration diagram showing a modified example of the spur driving means, and FIG. 5 is a perspective view showing a conventional separating and conveying device. (1)...Photosensitive drum, (8)...Timing roller, (9)...Transfer charger, (1■...
Fixing device, ■...Separation belt, ■...Guide plate (guiding member), ■...Spur, (31), (Company)・
...Spur arm, (to)...Drive shaft, ■...1
Rotating clutch, field...Oval cam, +a...Solenoid, (a...Spur frame, (41...Rail, (451...Solenoid, (Al...Transfer a area, (Pl)・Copy paper.

Claims (1)

[Claims] 1. Separating the copy paper onto which the toner image has been transferred from the photoreceptor,
A separation belt that slides into contact with one end of the transfer area of the photoreceptor in a device for conveying the photoreceptor to the next process, a guide member provided on the exit side of the transfer area, and a belt that can be lowered toward the guide member near the photoreceptor. A copy paper separating and conveying device comprising: a plurality of spurs arranged in parallel; and a driving means for sequentially lowering the spurs from the separation belt side immediately after the leading edge of the copy paper passes under the spurs. . 2. The driving means includes a plurality of spur arms rotatably supporting a spur at the tip and swingably disposed, and a plurality of spur arms provided in sliding contact with each arm to swing the arms. 2. The copy paper separating and conveying device according to claim 1, comprising a cam and means for rotating the cam. 3. The drive means is comprised of a plurality of spur arms rotatably supporting a spur at their tips and swingably disposed, and a solenoid provided for each arm to swing the arms. A copy paper separating and conveying device according to claim 1, characterized in that: