JPH03249043A - Sheet conveyer - Google Patents

Abstract

PURPOSE:To make it easy to deal with a jam and also prevent deformation of each guide plate by providing a guide member between a registration portion and a transfer portion, and putting one part of the guide member in a turning movement about the center of a roller shaft located above a pair of resist rollers so as to release pressure applied to the pair of resist rollers. CONSTITUTION:An elastic member 125 is provided on the bottom portion of a process cartridge K, and normally a guide plate A124 is pressed downward to fix the guide plate A124 to surely guide into a drum 112 paper in the form of a sheet. When a jam occurs the process cartridge K is removed and the end of paper P1 projecting from guide plates A124a and B126 is grasped and drawn in the direction of the arrow C and then the guide plate A124 is put in a turning movement in association with this operation and a cam-shaped portion 124b is made to abut on the outer diameter portion of a bearing 121 and thereby a space is formed between registration upper and lower rollers 107, 108 so that the paper can be taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sorting and conveying device that is applied to copying machines, printers, and the like.

[Conventional technology]

Conventionally, an image forming apparatus is configured as shown in FIG. 5(A). A cassette 101 for stacking and storing sheets is attached to the main body 100 near a feeding means 102.

P is paper, 103 is an intermediate plate on which the paper is loaded, 104 is an elastic member for pressing the tapered part against the feeding roller of the feeding means, 1
Reference numeral 05 denotes a separating means consisting of a friction member and a pressing member for separating fed sheets one by one.

Reference numeral 106 denotes a registration section for regulating the leading edge of the fed paper. Consists of two roller pairs 107°108,
A guide member 109 is attached to the shaft 107a of the upper roller 107.
are coaxially supported, and the upper roller 107 is configured to move upward in conjunction with the rotation of the guide member 109.

K is a removable process cartridge for forming a toner image by using laser light emitted from the scanner 110 and reflected by the mirror 111 to form a latent image on the photosensitive drum 112. 113 is a developing device, 114 is a primary charger, 115 is a pre-exposure device, and 116 is a cleaner container. A fixing device 117 fixes the toner image formed on the paper.

The image forming apparatus main body 100 is divided into parts such that an upper cover 100a can be opened and closed around a hinge part 100b.
The upper cover 100a is opened and closed when attaching and detaching the process cartridge and when handling paper jams.

When the paper feed roller 118 rotates, the paper in the cassette 101 is separated one by one and enters the registration section 106, and after timing, the toner image on the conveying photosensitive drum 112 is transferred to the paper by the transfer charger 119. Transferred to the top surface. Thereafter, the image is fixed on the paper by the fixing device 117, and the paper is discharged to the outside of the main body.

In such a series of operations, the paper may stay (jam) in the image forming apparatus depending on the state of the paper (warp, fold, etc.). At this time, as shown in FIG. 5(B),
After opening the upper cover and removing the process cartridge, the guide member 109 is opened and closed to release the pressure on the pair of registration rollers. Then, the paper P1 that remains is pulled out from the direction of arrow A or B and processed.

[Problem that the invention is trying to solve]

However, the above conventional example has the following drawbacks.

(1) When clearing a jam, depending on the direction in which the paper is pulled out, the paper may be torn or the guide plate may be deformed.

(2) Since the direction in which the paper is pulled out is limited, the main body configuration of the image forming apparatus is limited. In other words, it was necessary to secure a space that would make it easy to dispose of jams.

[Means for Solving the Problems (and Effects)] According to the present invention, a part of the guide member for guiding the paper provided between the registration section and the transfer section is arranged on the roller above the registration roller. It can be rotated around the axis, and in conjunction with the rotation, the pressure on the pair of registration rollers can be released.

〔Example〕

1 and 2 show an embodiment of the invention.

FIG. 1(A) is a sectional view showing a state in which a process cartridge K is installed. 107 is a registration upper roller;
108 is the registration lower roller, 120 is the registration upper roller bearing (A), and 121 is the registration lower roller bearing (B).
It is. Figure (B) is a side view and a front view, and 122 is a side plate, and the side plate has bearings (A) 120 and (B).
A slot 122a is provided so that the roller 121 can be locked therein, and both ends of the upper registration roller 107 and the lower roller 108 are fixed by a ring R. Bearing (A)
An elastic member 123 is hooked to the outer diameter portion of the resist member 120, and both ends of the elastic member are engaged with holes 122a provided in the side plate 122. Normally, the resist upper roller 107 is pressed by the lower roller 108. There is.

Further, both arm bent portions 124a of a guide plate (A) 124 are pivotally supported by the bearing (A) 120. Further, an elastic member 125 is provided at the bottom of the process cartridge, and normally, by pressing the guide plate (A) 124 downward,
A guide plate (A) 124 is fixed to ensure that a sheet of paper is guided to the drum 112.

If a jam occurs here, remove the process cartridge as shown in FIG. 2(A). And guide plate (A)
The guide plate (A) 124 rotates in conjunction with the operation of grasping the leading end of the paper P1 protruding from the sheets 124a and (B) 126 and pulling it in the direction of arrow C. Guide plate (A) 12
A cam-shaped portion 124b is formed on both side bent portions 124a of No. 4, and when the guide plate (A) 124 rotates, the cam-shaped portion 124b comes into contact with the row diameter portion of the bearing (B) 121. The upper registration roller 107 moves upward. Further, a stopper portion 124C is formed on the bent portion 124b.

As in the series of operations described above, the guide plate (A) rotates at the same time as the paper is pulled during jam processing, and a gap is created between the upper registration roller and the lower roller, so that the paper can be pulled out.

[Other Examples]

(Example 2) As shown in Fig. 3, the guide plate (A) and the guide plate (B)
A configuration may also be adopted in which a guide plate 127 that is integrated with the guide plate 127 is rotated. In this case, the transfer charger 119 and the transfer roller (not shown) can be easily replaced.

(Embodiment 3) As shown in FIG.
A configuration may also be used in which the upper roller rises when the roller 8 is rotated in the direction of the arrow. Further, an elastic member 130 is provided between the lower roller end 108a and the arm portion 128a of the guide member, and a frictional force is exerted between the roller 108 and the guide member 128, so that when the lower roller conveys the paper, the elastic member 130 is The guide member may be configured to be biased in the direction of arrow F by the frictional force when the guide member rotates in the direction of arrow F. 128b is a stopper that comes into contact with the lower guide member 126.

〔Effect of the invention〕

According to the present invention, (1) Jam handling becomes easier. (Jam removal can be done in less space) (2) It becomes easier to clean dirt such as paper dust and horse chestnuts.

(3) Deformation of the guide plate can be prevented.

(4) It becomes easier to replace consumable parts of the transfer section.

There are effects such as

[Brief explanation of drawings]

Figures 1 and 2 are diagrams of a paper conveying device in which the present invention is implemented, Figures 3 and 4 are diagrams showing other embodiments, and Figure 5 is a diagram showing a conventional embodiment. . 124.126...Guide plate 125...Elastic member 107...Registration upper roller 108...Registration lower roller Fig. 3

Claims (2)

[Claims] (1) A sheet conveying device of an image forming apparatus that has a registration means consisting of a pair of rollers that regulates the leading edge of a fed sheet, and a guide member that guides the sheet conveyed by the registration means to an image forming means. In the above, one of the guide members is rotatably supported, and in conjunction with the rotation of the one guide member, the one roller moves in a direction away from the other roller, and A sheet conveying device characterized in that one guide member is biased to maintain a predetermined position via an elastic member. (2) a guide member located above the guide member is pivotally supported by a roller shaft located above the registration means;
Claim 1, characterized in that a roller positioned above moves upward in conjunction with the rotation of the guide member, and the guide member is urged to maintain a normal position via an elastic member. The sheet conveying device described in Section 1.