JPH04249277A - Form peeling/guiding device for image forming device - Google Patents

Abstract

PURPOSE:To surely peel and smoothly guide even for a curled form and a form that is not sufficiently stiff, without having form jamming. CONSTITUTION:In the form peeling/guiding device of the image forming device composed of plural peeling pawls 5 whose top ends are brought into contact with a photosensitive drum 1 to peel a copying form P attracted to the photosensitive drum 1 and plural guiding members 11 and 12 disposed so as to be separated each other between the peeling pawl nearest to a copying form side end and a form side edge, a distance between the guiding surface of the guiding member 11 adjacent to the peeling pawl nearest to the copying sheet side edge and a path for carrying a form after a toner image is transferred is shorter than a distance between the guiding surface of the other guiding member 12 and the above-mentioned path for carrying the sheet and a distance between the guiding surface of the peeling pawl nearest to the copying form side edge and the above-mentioned path for carrying the form even for a curled form and a form that is not sufficiently stiff are surely peeled and smoothly guided to the carrying device without having the paper jamming.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a paper peeling guide device for an image forming apparatus such as an electrophotographic copying machine, a printer, or a facsimile machine, and more particularly, the present invention relates to a paper peeling guide device for use in image forming apparatuses such as electrophotographic copying machines, printers, and facsimile machines, and in particular, the present invention relates to a paper peeling guide device for peeling paper on which a toner image has been transferred from the surface of a photoreceptor. The present invention relates to a paper peeling guide device for an image forming apparatus that smoothly guides paper to a conveying device.

0002

2. Description of the Related Art Conventionally, in image forming apparatuses such as electrophotographic copying machines, printers, and facsimiles, paper peeling claws have been used to forcibly peel off paper adsorbed to photosensitive drums. In this method, a plurality of claws are placed in contact with the photosensitive drum while being spaced apart in the axial direction of the photosensitive drum, and the paper that hits the leading end of the claws is forcibly peeled off from the photosensitive drum.

[0003] In such a paper peeling claw, peeling is smoothly promoted from the peeling claw located at the outermost part in the axial direction of the photosensitive drum to the side edge of the paper, and the peeled paper is stably transferred to the paper conveyance path. Conventionally, a plurality of guide members were provided spaced apart between the outermost peeling claw and the paper side edge in order to guide the paper. The situation will be explained with reference to FIGS. 4 and 5. FIG. 4 is a view of the photosensitive drum 1 viewed from the axial direction, and the paper conveyance path R is located in contact with the lower side of the photosensitive drum 1. The copy paper P may reach the cleaning device 2 without being peeled off from the photosensitive drum 1 in a region of a peeling corotron (not shown). In order to forcefully peel off the paper P with such peeling defects from the photosensitive drum 1, a paper peeling claw 5 (51) is installed between the transfer area and the cleaning device 2. FIG. 5 is a view seen from the direction of arrow A--A in FIG. 4, and in this example, three peeling claws 51, 52, and 53 are provided at an appropriate distance apart in the axial direction of the photosensitive drum 1. As shown in FIG. 5A, for example, two guide members 11 are placed between the outermost peeling claw 51 and the side edge of the paper P.
', 12' are provided at a distance from each other (Fig. 4
, the guide member 11' is shown in broken lines, and the guide member 12' is shown in dotted lines. ). And the guide member 11
The height of the lower surfaces of the guide members 11' and 12', that is, the surfaces that contact and guide the paper P from the paper transport path R, is lower than the guide surface below the peeling claw 51 in both the guide members 11' and 12'.
Further, the height of the guide member 12' closer to the paper P side edge is the same as that of the guide member 11' closer to the outermost peeling claw 51.
(See Figures 4 and 5(a))
. The paper P arranged in this manner and peeled off by the peeling claw 51
are forcibly guided toward the transport path side (downward) in order by guide members 11' and 12'.

0004

[Problems to be Solved by the Invention] However, in the conventional paper peeling guide device consisting of such a peeling claw and a guide member, the second side of paper for double-sided copying, multiple copying,
If you use thin paper such as water-containing paper or tracing paper,
On the second side of double-sided copying or multiple copying, the sides of the paper curl upward, and since water-containing paper and thin paper have no elasticity, the paper is forcibly separated between the peeling claws 51, 52, and 53. However, the sheet P does not easily peel off from the outermost peeling claw 51 to the side edge of the paper P, and progresses while being attracted to the photosensitive drum 1. Therefore, the leading edge of the paper P is in the state shown in FIG.
At the position , the leading edge of the paper P reaches a position higher than the upper surface of the guide member 12'. In this case, the paper P gets stuck between the guide members 11' and 12' and becomes jammed.

The present invention has been made in view of these problems, and its object is to provide a paper peeling guide device comprising a peeling claw and a guide member disposed between the outermost claw and the paper side edge. To provide a paper peeling guide device that reliably peels curled paper, thin and stiff paper without paper jams, and smoothly guides the paper to a conveying device.

[0006]

[Means for Solving the Problems] A paper peeling guide device of an image forming apparatus according to the present invention that achieves the above object has a tip end that comes into contact with a drum-shaped or belt-shaped latent image carrier and is attracted to the latent image carrier. A paper peeling guide for an image forming apparatus that includes a plurality of peeling claws that peel off copy paper, and a plurality of guide members that are spaced apart from each other between the peeling claws closest to the side edge of the copy paper and the paper side edge. In the apparatus, the distance between the guide surface of the guide member adjacent to the peeling claw closest to the side edge of the copy paper and the paper conveyance path after toner image transfer is determined as the distance between the guide surface of another guide member and the paper conveyance path. and the distance between the guide surface of the peeling claw closest to the side edge of the copy paper and the paper conveyance path.

In this case, the tip positions of the plurality of guide members are
It is desirable to arrange the guide members so that they are arranged so as to be retreated toward the downstream side in the sheet conveyance direction as they move away from the peeling claw closest to the side edge of the copy sheet, from the viewpoint of preventing the tip of the guide member from interfering with sheet peeling and causing a jam.

Further, if at least one of the plurality of guide members is constituted by the tip of a supporting member of a star wheel that conveys the copy paper in cooperation with a conveyance belt that constitutes a paper conveyance path after the toner image is transferred, The configuration around the latent image carrier is further simplified.

[0009]

[Function] In the present invention, the distance between the guide surface of the guide member adjacent to the peeling claw closest to the side edge of the copy paper and the paper conveyance path after toner image transfer is determined from the guide surface of other guide members. The distance between the paper transport paths is smaller than the distance between the paper transport path and the guide surface of the peeling claw closest to the side edge of the copy paper, so curled paper, thin and stiff paper can be removed. Even if there is no paper, it can be reliably peeled off without paper jams and smoothly guided to the conveyance device.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment in which the paper peeling guide device of the present invention is applied to the paper peeling claw device of Japanese Patent Application No. 2-249047 proposed by the present applicant. 2 is a cross-sectional view of a copying machine portion equipped with a paper peeling guide device of the present invention, and FIG. 2 is a view looking up at the photosensitive drum 1 and cleaning device 2 from the bottom side of FIG. 1. FIG. R in the drawing represents the path of the copy paper, and some of the copy paper P reaches the position of the cleaning device 2 without being peeled off from the photosensitive drum 1 in the region of a peeling corotron (not shown). In order to forcefully peel off the paper P with such peeling defects from the photosensitive drum 1, a peeling claw 5 is installed between the transfer area and the cleaning device 2.
(51 to 53), a claw holding member 4 that is attached to the peeling claw 5 by giving it a counterclockwise turning spring behavior in the drawing, and a drive that periodically moves the claw holding member 4 in the axial direction of the photosensitive drum 1. From the shaft 7 and a leaf spring whose one end is attached to the lower surface of the cleaning device 2 and whose other end is in contact with the rear end of the claw holding member 4 to give the claw holding member 4 a counterclockwise rotational spring behavior in the drawing. It consists of a spring pressing member 8 and a stopper 9 that restricts the rotation of the claw holding member 4 by the spring pressing member 8. The claw holding member 4 is attached to a drive shaft 7 so as to be able to rotate around the shaft, and the drive shaft 7 is equipped with an eccentric cam 13 that slowly rotates once every several hundred copies. Due to the action of the coil spring 14, it reciprocates in the left-right direction in FIG. 2 (in the axial direction of the photosensitive drum 1). Along with this, the peeling claw 5 also moves back and forth while contacting the surface of the photoreceptor, thereby preventing it from constantly contacting the same position on the surface of the photoreceptor and damaging only that position.

By the way, in this copying machine, the side edge of paper of any size is positioned at a certain position S on the left side of FIG. A first guide member 11 and a second guide member 12 each having a pointed tip are provided at a distance from each other (see Fig. 1).
, the first guide member 11 is shown by a broken line, and the second guide member 12 is shown by a dotted line. ), guide member 11, 1
2, the paper P whose leading end has been peeled off by the peeling claw 51 is forcibly peeled downward and guided. As is clear from FIG. 1, the height of this lower guide surface from the paper conveyance path R is highest at the peeling claw 51, second highest at the second guide member 12 near the side edge of the paper P, and The first guide member 11 adjacent to the claw 51 is the lowest.

With this structure, the sheet P peeled off by the peeling claw 51 is immediately guided strongly downward by the first guide member 11 adjacent thereto, and then is guided downward by the second guide member 1.
2, the paper P is further guided downward and peeled off to the side edge of the paper P. The paper is double-sided copying, the second side of multiple copies, water-containing paper,
Even if the paper is thin, such as tracing paper, and is curled upward or has no stiffness, and the part from the peeling claw 51 to the side edge of the paper P does not easily peel off and continues to advance while adsorbed to the photosensitive drum 1. , since the second guide member 12 is located at a higher position than the first guide member 11 as shown in FIG. 5(c), the position of the first guide member 11' and the second guide member 12 are different as shown in FIG. There is no possibility that the paper P will get stuck between '' and cause a jam. In this way, a plurality of guide members are arranged at a distance from each other between the peeling claw closest to the paper side edge and the paper side edge, and the guide members are placed between the guide surface of the guide member adjacent to the peeling claw and the paper conveyance path. By making the distance smaller than the distance between the guide surfaces of other guide members and the paper conveyance path and the distance between the guide surface of this peeling claw and the paper conveyance path, it is possible to handle curled paper, thin paper with no elasticity, etc. , the paper can be reliably peeled off without paper jams and smoothly guided to the conveyance device.

By the way, regarding the position of the tip of each of the guide members 11 and 12, as shown by the dotted line L in FIG. , the tips of the guide members 11 and 12 are peeling claws 51.
It is preferable that the distance from the object is further retreated. The reason for this is that since the paper P is peeled off from the photosensitive drum 1 with a time delay from the position of the peeling claw 51 to the side edge of the paper, the tip of the guide member located further outward from the peeling claw 51 is further retreated. Otherwise, the leading edge of the paper P will be obstructed and caught by the guide member during the peeling process, and will not fall onto the conveyance path R, resulting in a jam.

In the above embodiment, only two guide members are provided, but if there are three or more guide members, the height from the second guide member onwards may be the same or increase in order toward the side edge of the paper. Make it. Further, it is desirable that the leading edge is moved back further away from the peeling claw closest to the side edge of the paper.

Now, any of the guide members can be used also by a part of the device having other functions. For example, the second guide member 12 shown in FIGS. 1 and 2 may be constructed from the tip of a support bracket of a star wheel of a sheet conveying device proposed by the present applicant in Japanese Patent Application No. 2-288779. FIG. 3 shows a front view of the paper conveyance device. To explain the general structure, the paper conveyance device conveys small-sized paper such as postcards by the cooperative action of the belt 15a having the protrusion 15e of the conveyance belt device 15 and the star wheel 20 which is loaded by the weight member 31. It has a support bracket 21 that rotatably supports the star wheel 20,
One end (downstream end in the transport direction) of the support bracket 21 is attached to the lower part of the rail 6 so as to be rotatable around a support shaft 22 . The other end faces the photosensitive drum 1, and this end can be used as the second guide member 12. In FIG. 3, other symbols 15b and 15c are rollers, 15d is a roller support plate, 16 is a registration gate, 17 is a transfer charger, 18 is a peeling static eliminator, 23 is an abutting piece, 25 is a long hole, 26, 27
is an auxiliary wheel, 28 is a contact surface, 30 is a movable shaft, 33 is an arm member, 34 is a shaft, 35 is a movement axis limiting arm, 36
is the tip of the movement axis limiting arm, and for their operation, please refer to the specification of the above-mentioned application.

Although the paper peeling guide device of the present invention has been described above with reference to embodiments, the present invention is not limited to these embodiments and can be modified in various ways. Further, the present invention can also be applied to an image forming apparatus that uses a belt-shaped photoreceptor.

[0018]

As described above, according to the paper peeling guide device of the image forming apparatus of the present invention, the guide surface of the guide member adjacent to the peeling claw closest to the side edge of the copy paper and the paper transport after toner image transfer are separated. The distance between the paper transport path and the guide surface of the other guide member and the distance between the paper transport path and the guide surface of the peeling claw closest to the edge of the copy paper side are determined as follows: Since the distance is smaller than the distance between the sheets, even curled paper, thin and stiff paper can be reliably peeled off without paper jams, and can be smoothly guided to the conveying device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a portion of a copying machine equipped with a paper peeling guide device of the present invention.

FIG. 2 is a diagram looking up at the photosensitive drum and cleaning device from the bottom side of FIG. 1;

FIG. 3 is a front view of the sheet conveyance device proposed by the present applicant in which the tip of the support bracket of the star wheel is used as a guide member.

FIG. 4 is a diagram viewed from the axial direction of a photosensitive drum, showing the arrangement relationship between a conventional peeling claw and a guide member.

FIG. 5 is a view seen from the direction of arrow AA in FIG. 4;

[Explanation of symbols]

P...Copy paper R…Copy paper path 1...Photosensitive drum 2...Cleaning device 4...Claw holding member 5, 51, 52, 53...Peeling nails 7...Drive shaft 8...Spring pressing member 9...Stopper 11...First guide member 12...Second guide member 13...Eccentric cam 14...Coil spring

Claims (3)

[Claims] 1. A plurality of peeling claws whose tips come into contact with a drum-shaped or belt-shaped latent image carrier and peel off copy paper adsorbed to the latent image carrier, and a peeling claw closest to the side edge of the copy paper and the paper. In a paper peeling guide device of an image forming apparatus that includes a plurality of guide members spaced apart from each other between the side edge of the copy paper and the toner and the guide surface of the guide member adjacent to the peeling claw closest to the side edge of the copy paper. The distance between the paper transport path after the image transfer is determined by the distance between the guide surface of another guide member and the paper transport path, and the distance between the guide surface of the peeling claw closest to the side edge of the copy paper and the distance between the paper transport path and the guide surface of the other guide member. A paper peeling guide device for an image forming apparatus, characterized in that the distance is smaller than the distance between paper transport paths. 2. The tip positions of the plurality of guide members are arranged so as to be sequentially retreated toward the downstream side in the sheet conveyance direction as the distance from the peeling claw closest to the side edge of the copy sheet increases. A paper peeling guide device for an image forming apparatus. 3. At least one of the plurality of guide members is constituted by a tip end of a support member of a star wheel that conveys the copy paper in cooperation with a conveyance belt that constitutes a paper conveyance path after the toner image has been transferred. 3. A paper peeling guide device for an image forming apparatus according to claim 1, further comprising: a paper peeling guide device for an image forming apparatus.