JPH0352871B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention transfers an image by conveying a paper to a transfer unit of electrophotography, magnetography, etc. without using a grip to hold the paper or a group of rollers to hold the paper. The present invention relates to a conveyance transfer device capable of performing the following operations.

[Conventional technology]

As a conventional conveyance transfer device, there is one shown in FIG. 1, for example. This conveyance transfer device is a photoconductor on which a latent image is formed on the surface of a photoconductor that is uniformly charged by a scanning device (not shown), and a black and white or color image is developed by a developing device (not shown). a drum 1; a transfer drum 2 that is disposed so as to be in close proximity to or in contact with the surface of the drum 1 at the transfer position, and that rotates at the same circumferential speed while winding the transfer paper; and a transfer drum at the transfer position. a transfer corotron 3 that is provided inside the photoreceptor drum 2 and transfers the toner image 7 formed on the photoreceptor drum 1 to a transfer sheet;
A paper feed cassette 5 in which a large number of sheets of transfer paper 4 of a desired size are loaded; a paper feed roll 6 that feeds the topmost paper of the cassette to the transfer drum 2 during transfer; A plurality of transfer paper holding rollers 7a to 7e are tightly wound around the rollers 7a to 7e, and a gripper 8 is positioned immediately in front of the roller 7a during paper feeding to grip the fed paper (the gripper 8 is shown below). For example, there is JP-A-56-122067) and
A charging corotron 9 uniformly charges the transfer paper before transfer, a static eliminating corotron 10 removes the charge on the transfer paper after transfer, and the transfer drum 2 rotates once for black and white copying and rotates once for color copying. After three rotations and completion of all transfer, a peeling pawl 11 peels off the transfer paper that is in close contact with the surface of the transfer drum 2 from the drum surface, and the transfer paper peeled off by the pawl 11 is transferred to a discharge tray or the like. It is composed of a conveyance path 12 for conveying to.

In the above configuration, for example, when transferring a color developed image, three types of filters are installed in the scanning device for each exposure, and a developing machine having a toner color according to the type of filter is selected for each exposure. Ru. That is, each time the photosensitive drum 1 rotates once,
Exposure, development, and transfer steps are performed, and in the case of color copying, the above steps are performed three times. When the first development is completed, the paper feed roll 6 rotates in pressure contact with the upper surface of the transfer paper at a predetermined timing, the transfer paper is fed, and its leading edge is bitten by the gripper 8. At the same time as the gripper 8 is closed, the transfer drum 2 rotates and the transfer paper is wound around the roller 7a, and the transfer paper is sequentially charged by the charging corotron 9 and moved to the transfer position. be rushed out. The visible image on the first surface of the drum arrives at the timing when the paper arrives at the transfer position, and is continuously transferred to the transfer paper by the transfer corotron 3, and the transfer by the first color is completed. . Even after this transfer is completed, the transfer paper remains wrapped around the transfer drum 2, waiting until the second transfer starts. When the second exposure and development are performed, the transfer paper and the visible image reach the transfer position again at a predetermined timing, and the transfer is performed sequentially. Even after this transfer, the transfer paper remains wound around the transfer drum 2, waiting for the third transfer. The third exposure, development, and transfer are performed in the same manner as described above, and when the three transfers are completed, the transfer sheet is peeled off from the drum surface by the peeling claw 11 and sequentially sent to the conveyance path 12.

[Problem that the invention seeks to solve]

However, in the conventional transfer transfer device, rollers 7a to 7d to prevent the transfer paper from falling from the transfer drum 1 and grips to hold the paper are required. In addition to the risk of causing disturbance, there was also the inconvenience that the portion held by the grip portion could not be transferred onto the paper.

[Means and effects for solving the invention]

The present invention has been made in view of the above, and in order to be able to convey paper and transfer images without using the grippers and holding rollers that were provided in conjunction with the transfer section, the present invention has been made in such a way that the transfer support material is semi-transferred. It is formed of a conductive resin film, and a plurality of electrodes of a predetermined length are arranged on the resin film at regular intervals in the width direction, and a transfer voltage is applied to the electrode moved to the transfer position among these electrodes. , provides a transport transfer device in which an adsorption voltage is applied to the electrode moved to the transport position (electrostatic adsorption is disclosed in Japanese Patent Publication No. 14982/1982, but paper adsorption and (It is a concise embodiment of image transfer).

〔Example〕

Hereinafter, the conveyance transfer device according to the present invention will be explained in detail.

FIG. 2 shows an embodiment of the present invention, in which the same parts as in FIG. As shown in FIG. 3, there is a resin film 21 formed into a cylindrical shape, an electrode part 22 arranged inside the resin film 21 in the film width direction, and a large number of electrode parts 22 mounted at regular intervals. Transfer brushes 23a and 23b are movably installed inside the resin film 21 at the transfer position and to which a predetermined DC voltage is applied.
and suction brushes 24a, 24b, which are slidably installed on the electrode part 22 inside the resin film 21 except for the transfer position, and to which a predetermined DC voltage is applied.
25a and 25b.

4 and 5 show the structure of the electrode section 22, in which a large number of strip-shaped electrodes 26 are arranged in the width direction of the back surface of the resin film 21 and are provided at regular intervals.
a support layer 27 made of an insulating material that fixes each of the electrodes 26 to the resin film 21; It is composed of sliding electrodes 28a and 28b.

Further, FIG. 6 shows the power supply connection of the electrodes, and shows the transfer power supply 31 that applies a DC high voltage to the transfer brushes 23a and 23b that slide on the sliding electrodes 28a and 28b, and the voltage of the power supply 31. Brush 2
A switch 32 applies voltage to 3a and 23b at predetermined times.
, an adsorption power source 33 to which a DC high voltage (ground side is negative) is applied to the brush 24a and the brush 24b which are grounded and slide on the sliding electrode 28a;
a switch 34 that applies the voltage to the brush 24b at a predetermined time; an adsorption power source 35 that applies a DC high voltage (negative on the ground side) to the brush 25a and the brush 25b that are grounded and slide on the sliding electrode 28a;
It is comprised of a switch 36 that applies the voltage of the power source 35 to the brush 25b at a predetermined time.

Note that the brushes 23a, 23b, 24a, 24
b, 25a, and 25b each have a specific resistance of 10 ² Ω・
It is formed by implanting conductive fibers with a length of about 5 mm into a support and is fixedly installed.

In the above configuration, when feeding the transfer paper, the paper feed roll 6 is driven and at the same time the switch 3 is activated.
4 and 36 are closed, the peeling claw 11 is released, and a predetermined DC voltage is applied between the brushes 24a and 24b and between the brushes 25a and 25b. As a result, the output voltage of the power supply 35 is applied between the adjacent electrodes via the sliding electrodes 28a and 28b, and electrostatic adsorption force is generated on the surface of the resin film 21, causing the fed transfer paper to move from the leading edge. are absorbed in order. Such an adsorption method using a semiconductive resin film is characterized in that the electrostatic attraction force rises and falls very quickly. The resin film 21 of the transfer drum 20 rotates while adsorbing the transfer paper. The switch 32 is closed in synchronization with the arrival of the leading edge of the transfer paper at the transfer position, and a high DC voltage having a polarity opposite to that of the toner adhering to the latent image is applied to each of the brushes 23a and 23b.
As a result, the toner image adhering to the surface of the photoreceptor drum 1 is transferred onto the transfer paper by electrostatic attraction. Since voltage is applied to the suction brushes 24a and 24b on the transfer paper after the transfer is completed,
It rotates while adsorbed to the surface of the resin film 21, and when multiple transfer is required such as color copying, it rotates once to perform the next transfer, and then rotates once again to perform the next transfer.
Multiple transfer of colors is performed. When multiple transfer is completed, the peeling claw 11 comes into contact with the surface of the resin film 21,
The leading edge of the transfer paper after the transfer is peeled off from the resin film surface and sent out to the conveyance path 12.

On the other hand, in the case of monochrome copying, the switch 36 is turned off, and when one transfer is completed, the peeling claw 11 comes into contact with the surface of the resin film 21, and the transfer paper is peeled off and sent out to the conveyance path 12, and then It is supplied to a fixing section (not shown).

FIG. 7 shows another embodiment of the present invention, in which the same parts as in FIG. 2 are indicated by the same reference numerals, so redundant explanation will be omitted. There is. This embodiment includes a belt 40 made of semiconductive resin and a pair of rolls 41a and 41b on which the belt 40 is mounted.
They are arranged on the horizontal surface of the belt 40, and each one has cyan, cyan,
A cyan image carrier 42 where the same original image is developed with magenta and yellow toners.
a, an image carrier 42b for magenta color, an image carrier 42c for yellow color, a suction brush 43 that attracts the fed transfer paper to the belt 40 by electrostatic adsorption force, and conveyed by the belt 40; A transfer brush 44 transfers the cyan image formed on the image carrier 42a onto the incoming transfer paper, an adsorption brush 45 adsorbs the transfer paper onto which the cyan image has been transferred to the belt surface, and the belt 40. A transfer brush 46 transfers the magenta image formed on the image carrier 42b onto the conveyed transfer paper, and an adsorption brush 47 and 40 adsorbs the transfer paper onto which the magenta image has been transferred onto the belt surface. A transfer brush 48 that transfers the yellow image formed on the image carrier 42c to the transfer paper that is conveyed along with the transfer paper, and brushes 44 and 4.
Peeling claws 49a and 4 separate the transfer paper onto which the toner image of a predetermined color has been transferred by each of 6 and 48 so as not to wrap around each image carrier and return it to the belt surface.
It is composed of 9b and 49c. In addition, belt 4
0, an electrode portion 22 and sliding electrodes 28a, 28b as shown in FIGS. 4 and 5 are formed.

In the above configuration, when the transfer paper is fed from the paper feed cassette 5 by the paper feed roll 6, the paper feed is detected by a paper feed sensor (not shown), and this detection causes the transfer paper to be transferred to the image carrier 42a. The rotation timing of ~42c is determined. At the same time, suction brushes 43, 4
5, 47 and transfer brushes 44, 46, 48
A predetermined DC high voltage is applied to each of the two. The transfer paper adsorbed by the adsorption brush 43 is transferred to the image carrier 42
The cyan image is conveyed directly under the transfer brush 4.
Transcribed by 4. The transfer paper peeled off by the peeling claw 49a is conveyed directly below the image carrier 42b by the suction force of the suction brush 45, and the magenta image is transferred by the transfer brush 46. The transfer paper is removed from the image carrier 4 by the peeling claw 49b.
The image carrier 2b is peeled off from the surface of the image carrier 42c, and conveyed directly below the image carrier 42c by the suction force of the suction brush 47. Here, the yellow image is transferred onto the transfer paper by the transfer brush 48. Image carrier 42a~
42c is controlled so that the images of each of the three colors are overlapped by rotating sequentially with a delay corresponding to the transport time of the transfer paper. The transfer paper on which multiple transfers have been completed is further sent to a fixing device, where fixing is performed.

〔Effect of the invention〕

As explained above, according to the conveyance transfer device of the present invention, the transfer material is formed into a drum shape or belt shape from a semiconductive resin material, and a plurality of strip electrodes are arranged at regular intervals on the inside of the transfer material. A transfer brush and a paper adsorption brush are arranged on these electrodes, and the transfer paper is conveyed while being attracted to the transfer material by electrostatic adsorption force, which eliminates the need for grippers and It is possible to eliminate the need for a restraining roller, and it is possible to prevent image omission and color shift at the leading edge of the transfer paper.

Furthermore, in the configuration shown in FIG. 7, conventionally, a plurality of transfer corotrons are required, and paper suction to the belt must be performed by air suction.
Although there were some inconveniences such as increased noise and power consumption,
According to the present invention, since conveyance and transfer are performed using a combination of electrodes and brushes, it is possible to achieve a structure that is noiseless and consumes low power.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional conveyance transfer device, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a perspective view of a resin film 21 according to the present invention, and FIGS. 4 and 5 are 6 is a sectional view and a bottom view of an electrode part according to the present invention, FIG. 6 is a power supply connection diagram of the electrode, and FIG. 7 is a front view of another embodiment of the present invention. Explanation of symbols: 1... Photosensitive drum, 5... Paper feed cassette, 6... Paper feed roll, 11, 49a to 49c...
Peeling claw, 12... Conveyance path, 20... Transfer drum, 21
...Resin film, 22...Electrode part, 23a, 23b44,
46, 48...Transfer brush, 24a, 24b, 2
5a, 25b...Adsorption brush, 26...Electrode, 27
...Support layer, 28a, 28b...Sliding electrode, 31,
33, 35... Power supply, 32, 34, 36... Switch, 41a, 41b... Roll, 42a-42b...
Image carrier.

Claims (1)

[Scope of Claims] 1. A semiconductive resin film that circulates around the transfer paper onto which the toner image of the photoreceptor is transferred while keeping it in close contact with the outer surface at least at the transfer position, and an insulating film that is fixed to the inner peripheral surface of the resin film. a support layer of the body, a plurality of electrodes arranged at regular intervals between the resin film and the support layer, and a sliding electrode connected to the electrode and exposed on the inner peripheral surface of the support layer. , an adsorption brush that slides on the sliding electrode that has moved to the paper transport position of the transfer section and electrostatically attracts the fed transfer paper by supplying a predetermined DC voltage; and the sliding electrode that has moved to the transfer position. 1. A transfer transfer device comprising a transfer brush that slides on a moving electrode and transfers toner by applying a voltage of opposite polarity to the toner.