JP2671320B2 - Electronic copier transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic copying machine, and more particularly, to an electronic copying machine in which the posture of a sheet conveyed from a sheet feeding side to a transfer area is stabilized. Regarding [Prior Art] Generally, in the peripheral portion of a transfer device of an electronic copying machine, as shown in FIG. 5, a latent image carrier a that forms a latent image and a transfer and peeling operation that opposes the latent image carrier a. A transfer area d is formed between the corotrons b and c, and a paper conveyance guide portion (sheet metal chute) e for guiding the paper A toward the transfer area d and a paper conveyance guide portion e are conveyed. A posture holding unit f that holds the posture of the sheet A that enters the transfer area d is provided. The posture holding unit f is composed of a sheet metal baffle h fixed to the transfer corotron b via an insulating synthetic resin fixing member g. In the electronic copying machine having such a structure, as shown in FIG. 6, the latent image carrier a is exposed by the optical system i to form a latent image on the surface thereof, and then the latent image carrier a is formed by the developer from the developing device j. An image is formed by developing with a certain toner, and after the image is transferred to the sheet A by charging by the transfer corotron b located in the transfer area d, the peeling corotron c
The sheet A is peeled off from the latent image carrier a by the removal of the charge, and the peeled sheet A is conveyed to the fixing unit k to fix the image on the sheet A. [Problems to be Solved by the Invention] However, in the conventional electronic copying machine, since the baffle h that constitutes the posture holding unit f is fixed to the transfer corotron b of the transfer device, the vibration of the baffle h and the like. Although it does not cause any adverse effect, the chute e that guides the paper A
Is fixed to a member other than the transfer device, it vibrates due to its mounting error, and the chute itself is deformed, which makes the attitude of the paper A into the transfer area d unstable, and the paper A and the latent image There is a problem in that the distance between the image carrier a and the toner changes, and when this distance increases, the toner scatters and uneven transfer occurs. Further, particularly in a multiplex / duplex copying machine, the curled paper A may be conveyed and plunge into the transfer area d. In this case, the plunge posture of the paper A becomes further unstable, and the image freshness is deteriorated. In addition to further reduction, there is a problem that paper jam may occur. Therefore, under the present circumstances, there is a demand for the development of an electronic copying machine that can stabilize the posture of the sheet entering the transfer area. [Means for Solving Problems] The present invention has been made in view of the above circumstances, and in order to solve the above technical problem, an attitude holding provided on the transfer device from the sheet conveyance guide unit side An electronic copy in which a deformation correcting member that protrudes toward the sheet side is provided, and the posture holding unit and the deformation correcting member correct the deformation of the paper, thereby maintaining the attitude of the paper entering the transfer area. Machine. That is, the present invention has a transfer device having a transfer and peeling corotron facing a latent image carrier that forms an image, an upper guide plate and a lower guide plate, and a sheet from the paper feed side toward the transfer device. A paper conveyance guide part for guiding the sheet and a posture holding means for holding the piercing posture of the paper conveyed from the paper conveyance guide part and rushing into the transfer area between the latent image carrier and the transfer device. In the electronic copying machine provided with the section, the leading end of the upper guide plate of the sheet conveyance guide section on the transfer area side protrudes toward the posture holding section, and together with this posture holding section, the paper The electronic copying machine is characterized in that a deformation correcting member for correcting deformation is provided. In the present invention, the posture holding unit is formed of a holding member which is provided in the transfer device and which holds the thrusting posture of the sheet immediately before entering the transfer area, or the holding member and the sheet conveying guide unit from the holding member. And a sheet conveying guide / combining member which extends toward the lower guide plate and constitutes a part of the lower guide plate of the sheet conveying guide portion. Further, the deformation correcting member may be any member as long as it can hit the upper portion of the deformed sheet when the sheet passes and corrects the deformation of the sheet, for example, a synthetic resin sheet member, a rigid metal plate material. Further, brush-shaped ones can be used. [Operation] The above technical means operates as follows. As described above, the deformation correcting member for correcting the deformation of the sheet at the tip of the upper guide plate of the sheet conveyance guide section on the transfer area side, the tip protruding toward the attitude holding section, and in cooperation with the attitude holding section By providing the sheet, when a sheet having a deformation such as curl passes between the posture maintaining unit and the deformation correcting member, the tip of the deformation correcting member hits the upper portion of the sheet and presses the sheet toward the posture maintaining unit. As a result, the sheet is corrected for its deformation and enters the transfer area. [Examples] Hereinafter, based on Reference Examples and Examples shown in the accompanying drawings,
The present invention will be specifically described. ◎ Reference Example FIG. 1 is a cross-sectional explanatory view for explaining an electronic copying machine to which the present invention is applied, and FIG. 2 is an enlarged view of a peripheral portion of a transfer device of the electronic copying machine of FIG. It is a principal part cross-section explanatory drawing. The electronic copying machine includes a latent image carrier 10 on which a latent image is formed by exposure from an optical system (not shown), a developing device 11 that applies toner to the latent image carrier 10, and an image developed by the developing device 11. A transfer device 13 that transfers the image from the latent image carrier 10 to the sheet A and a fixing device 15 that fixes the unfixed image on the sheet A are the main parts. Then, the transfer device 13 is a transfer and peeling corotron.
12, 12 and 14, and a transfer region 16 is formed between the latent image carrier 10 for forming an image. Also, this transfer area
A sheet metal chute (paper conveyance guide portion) 18 that conveys the paper A from the paper feed side to the transfer area 16 is disposed in the vicinity of the paper 16, and the paper A that enters the transfer area 16 from the chute 18 is disposed. The posture holding unit 20 provided in the transfer device 13
It is designed to be held by. The posture holding unit 20 is fixed to the transfer corotron 12 of the transfer device 13 via an insulating synthetic resin fixing member 22, and is a metal plate that holds the thrusting posture of the sheet A immediately before entering the transfer area 16. Made of a holding member 24, which is formed integrally with the holding member 24, extends from the holding member 24 toward the lower guide plate 28b of the chute 18, and forms a part of the lower guide plate 28b. (Posture stabilizing member) 26. In the electronic copying machine having such a structure, when the paper A guided by the paper feeding unit (not shown) is conveyed by the chute 18, the paper A is first conveyed and used as a paper conveyance guide (posture stabilizing member) 26. Then, the rushing posture is corrected to some extent, and then it is further fed to the holding member 24, where the rushing posture with respect to the transfer region 16 is maintained and rushes into the transfer region 16. Therefore, the sheet A is charged by the transfer corotron 12 while being in contact with the latent image carrier 10, the image on the side of the latent image carrier 10 is transferred to the sheet A side by this, and then the charge is removed by the peeling corotron 14 to remove the latent image. Peeled from the image carrier 10,
Further, it is sent to the fixing device 15 and fixed there. First Embodiment FIG. 3 shows the first embodiment of the present invention. In the electronic copying machine of the above-mentioned reference example, the upper guide plate 28a of the sheet metal chute (paper conveying guide unit) 18 has Its transfer area 16
The side tip portion is provided with a deformation correcting member 26a whose tip protrudes toward the posture holding unit 20 side and which, together with the posture holding unit 20, corrects the deformation of the sheet. In this embodiment, the deformation correcting member 26a is formed of a synthetic resin sheet, is fixed to the tip of the upper guide plate 28a by a pressing member 30, and its tip is a holding member of the posture holding unit 20. Opposite 24. Therefore, the sheet A guided and conveyed by the chute 18 is first of all a sheet conveyance guide / member (posture stabilizing member).
At 26, the posture to the transfer area 16 is corrected, and even if there is a deformation such as curl at that time, it moves from the sheet conveyance guide / member (posture stabilizing member) 26 to the holding member 24 and holds the same. When passing between the member 24 and the deformation correcting member 26a, the upper portion is pressed by the deformation correcting member 26a, the deformation such as curl is corrected, and then the transfer region 16 is rushed. In this embodiment, the deformation correcting member 26a is formed of a synthetic resin sheet, but it may be formed of a rigid metal plate material, or may be formed in a brush shape. Second Embodiment FIG. 4 shows a second embodiment of the present invention. Unlike the case of the first embodiment, the posture holding unit 20 has an insulating property with respect to the transfer corotron 12 of the transfer device 13. Fixing member made of synthetic resin
The holding member 24 is fixed via 22 and is made of a sheet metal to hold the thrusting posture of the sheet A immediately before entering the transfer area 16. Then, the upper guide plate 28a of the sheet metal chute (paper transport guide portion) 18 has a tip projecting toward the holding member 24 at the tip of the transfer region 16 side, and in cooperation with the holding member 24, the paper is fed. A sheet-shaped deformation correcting member 26a made of a synthetic resin for correcting the deformation of A is provided. Therefore, also in this embodiment, as in the case of the first embodiment, the sheet A conveyed by the chute 18 is moved by the deformation correcting member 26a when passing between the holding member 24 and the deformation correcting member 26a. The upper part is pressed and the deformation such as curl is corrected, and then it rushes into the transfer region 16. In this embodiment as well, it is needless to say that the deformation correcting member 26a may be formed of a metal plate material or a brush shape. [Effects of the Invention] As described above, according to the present invention, when the sheet conveyed by the sheet conveyance guide portion plunges into the transfer area, even if the sheet is curled or deformed, The posture holding unit that holds the thrusting posture of the sheet when entering the transfer area can correct the deformation of this sheet, and the sheet whose deformation has been corrected immediately enters the transfer area, ensuring a proper state. With this, it is possible to transfer an image to a sheet, and it is possible to prevent uneven transfer and deterioration of image freshness. Moreover, since the present invention has a simple structure, it can be easily and inexpensively applied to an existing electronic copying machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional explanatory view showing an electronic copying machine to which the present invention is applied. FIG. 2 is an enlarged cross-sectional explanatory view of a main part of the peripheral portion of the transfer device shown in FIG. FIG. 3 is a sectional view similar to FIG. 2, showing a state in which the first embodiment of the present invention is applied to the electronic copying machine of FIG. FIG. 4 is a sectional view similar to FIG. 3 showing the state in which the second embodiment of the present invention is applied. FIG. 5 is a sectional explanatory view showing a main part of a conventional electronic copying machine. FIG. 6 is a cross-sectional explanatory view showing a conventional electronic copying machine provided with the essential parts of FIG. Explanation of symbols 10 …… Latent image carrier, 12 …… Transfer corotron, 13 …… Transfer device, 14 …… Peeling corotron, 16 …… Transfer area, 18 ……
Chute (paper transport guide section), 20 ... posture holding section, 24 ...
… Holding member, 26 …… Paper conveyance guide member (posture stabilizing member), 26a …… Deformation correction member, 28a …… Upper guide plate, 28b
...... Lower guide plate.

Claims (1)

(57) [Claims] Transfer device (13) having a transfer and peeling corotron (12, 14) facing a latent image carrier (10) for forming an image
A paper transport guide section (18) having an upper guide plate (28a) and a lower guide plate (28b) for guiding the paper from the paper feed side toward the transfer device (13); 13), which is conveyed from the paper conveyance guide section (18) and is conveyed to the latent image carrier (10) and the transfer device (1).
An electronic copying machine having an attitude holding unit (20) for holding the thrusting position of the paper sheet that rushes into the transfer area (16) between the upper guide plate (28a) of the paper conveyance guide unit (18). ) Has a tip protruding toward the posture holding section (20) side at the tip of the transfer area (16) side, and together with the posture holding section (20), a deformation correcting member (26a) for correcting the deformation of the sheet. ) Is provided, an electronic copying machine.