JPS6331950A - Sheet material delivery device - Google Patents

Abstract

PURPOSE:To improve the accuracy of the size between rings, by furnishing grooves for a jig to each of a pair of comb teeth shape rollers which are formed by gearing disk-form elastic rings to rigid cylindrical holders with plural circumference grooves. CONSTITUTION:Plural circumference grooves 61 and 71 are furnished at cylindrical holders 6 and 7 made of a rigid material, and rings 8 and 9 of an elastic substance are geared to the grooves alternately to form a comb teeth shape rollers 1 and 2. At the center of the cylindrical holders 6 and 7, grooves 62 and 72 are furnished respectively to insert a jig therein. The roller 2 is fixed to a driving shaft 22 by an anti-thrust screw 99. Then, a jig 100 is inserted to the grooves 62 and 72 to set the position of the roller 1, and the roller 1 is fixed to a shaft 13 by a screw 19. The rings 8 and 9 are opposed each other accurately and the accuracy of the interval q between them is improved. Therefore, the rollers 1 and 2 can deliver the sheets one by one separated accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sheet material feeding device in an image forming apparatus,
In particular, it relates to a paper feed device in a copying machine, and more specifically, a pair of Fi+ toothed rollers whose outer peripheries are made of an elastic material are arranged with rings forming comb teeth alternately and slightly overlapping in the diametrical direction. This device relates to a device that rotates a pair of comb-like rollers in the same direction, applies one end of the stacked sheets to the nip portion of both rollers, and separates and feeds the sheets one by one.

[Conventional technology]

A description will be given below according to the conventional example shown in the drawings. In Fig. 3, 1 and 2 are Fy toothed rollers (hereinafter, this entire structure is referred to as a roller) whose outer peripheral portions are made of an outer body of glue such as rubber, and rollers (hereinafter referred to as rings) that form each comb tooth. , 2a-2n
The shafts are mounted parallel to each other with their circumferential parts slightly overlapping in a staggered state, and rotated in the same direction. A laminated bundle of cut sheets P is fed between the nip between both ends and the rad 2.

Now both mouths - rad 2 at the overlapping part o-, yl
is in the sheet feeding direction 3, -1- When the roller 2 is driven and rotated in the opposite direction, the lowest sheet is sent out in the rotational direction of the roller, that is, in the feeding direction due to friction with the rings 1a to 1n of the lower roller 1. . The second and subsequent sheets are prevented from advancing by the rings 2a to 2n of the upper roller 2, and the lowest sheet is sent out one after another.

Note that the lower roller 1 is provided with a one-way transmission clutch, which will be described later, between it and its drive shaft, and when the fed-out sheet is conveyed faster than the feeding speed by the downstream conveyance mechanism, the lower roller 1 is connected to the fed-out sheet. , and rotates to follow the conveyance feed.

Although this type of delivery device is known, the above-mentioned effect is very delicate, and it is difficult to produce a mechanism with a high yield that always maintains a smooth and good function over a long period of time.

In the above configuration, the factors for reliably feeding one sheet to the other are (1) the friction coefficient of the rubber rings 1a-in and 2a-2n, and (2) the over-ramp amount a (the 1st (Figure 4) (3) The distance g between adjacent left and right rings (Figure 5). Of these, the above (1) is determined by the material of the ring.

(2) is determined by the accuracy of the outer diameter of the ring and the distance between the roller axes, and the axle spacing is usually configured to be adjustable (described later).

(3) As shown in Fig. 5, rings la~1n, 2a~
It is determined by the accuracy of each @t of 2n, the interval p between adjacent rings in each roller 1 and 2, and the relative gap g between alternately adjacent rings.

Among the above (1) to (3), element (3) has the greatest influence on functionality. That is, if the difference in the left and right gaps g1 and g2 between each ring and the adjacent ring is large as shown in FIG. 5(B),
Sheets are not fed or double feeding occurs. Or there may be streaks on the sheet that is fed out.
Transfer omissions are likely to occur, which may affect the image. Further, if the difference in the gap g is uneven and large, for example, gl>gn on one side g1 of the roller 1-2 and on the other side gn, as shown in FIG. 5(C), the sheet is likely to be skewed.

The gap g between adjacent rings is determined by the width t of each ring, the interval p, and the relative position of the roller rod 2. To maintain high accuracy of the ring gap p, it is necessary to increase the accuracy of the ring width t and interval P (7). There is. In addition, the shafts of the two roller rods 2 must be mounted in the thrust direction with accurate positions.

Conventionally, as shown in FIG. 6, after forming rings 1a to 2n by baking a rubber roller lφ2 in a comb-teeth shape onto a core metal 4 pot 5, the outer diameter and both side surfaces 11-12.21φ of each individual ring are determined.
22 is polished and finished. In this case, outer diameter accuracy can be obtained relatively easily. However, it is very difficult to process the side surfaces of the ring, that is, to obtain accurate thickness, because the ring is made of elastic rubber and the part that receives the force from the side is wide, and there is no member to support it from the back.

On the other hand, it is possible to form a mold that does not require side polishing, but since it is a split mold, there will be burrs on both sides, so polishing will be required to remove this, and it will not be possible to achieve sufficient thickness accuracy. Can not. As a result, the thickness t of each ring and the pitch p between adjacent rings become non-uniform, resulting in an error in the relative gap g.

[Purpose of the invention]

The present invention aims to improve the accuracy of the element (3), which has the most delicate relationship with the separation and feeding of sheets as described above.

A means to solve the above problems was already developed in Japanese Patent Application Laid-open No. 1983
-56742, but the present invention includes further improvements.

〔Example〕

The present invention will be explained below based on one embodiment shown in the drawings.

Fig. 1 shows an embodiment of the present invention, where 6 and 7 are rigid cylindrical supports made of metal, resin, etc., and 61 and 71 are provided on the supports 6 and 7 at a predetermined interval p and at the required width and depth. multiple circumferential grooves, 8
・9 is a disk-shaped elastic ring made of rubber, etc., which is inserted into the circumferential groove 6.
It has center holes 81 and 91 that fit the bottom surfaces of the rollers 1 and 71, and is firmly fitted into the respective circumferential grooves 61 and 71 to form a jB@roller.

With the above configuration, the spacing p between the rings of each roller rod 2 is determined by the circumferential grooves 61 and 71 of the rigid core metal cylindrical body 6◆7, so that it can be obtained with high accuracy.

The disc-shaped rings 8 and 9 can be made with a mold, and in that case, it is only necessary to reduce the thickness of one disc-shaped ring, so that a highly accurate ring can be easily obtained. In this case, the split die can be exposed on the outer circumferential surface, making it easy to finish with high precision by polishing the outer diameter.

Here, in addition to the circumferential grooves 61-71 into which the disc-shaped rings 8 housings 9 are fitted, the rigid core metal cylindrical bodies 6 and 7 have the same width in order to keep the gap g between adjacent disc-shaped rings constant. circumferential groove 6
2 and 72 are provided on the same row. A jig 100 is inserted into the circumferential grooves 62 and 72 having the same width, as shown by the two-dot chain line in the figure.

On the other hand, the disc-shaped ring 7 is provided with a set screw 99 for determining the position in the thrust direction.

During assembly, loosen the stopper 99 and insert the jig 5!100 into the circumferential grooves 62 and 72 as shown in Figure 2.
In this state, stop the stopper 99. Rigid core metal cylindrical body 6
・Since 7 is integrally made of metal or resin, it can be manufactured with high precision, and by providing a jig groove for thrust alignment, the gap g between adjacent disk-shaped rings on the left and right sides can be adjusted with high precision. You can get something.

Next, it is necessary to support each drive shaft with high precision in the relative position of the roller rod 2. Examples thereof are illustrated in FIGS. 1 and 2. The lower roller l has a bearing 14aφ14 on the drive shaft 13.
It is rotatably supported via b. A clutch element 17, which is in close contact with one end m1 of the cylindrical support 6 of the roller 1 and engaged with the uneven portions 15 and 16, is rotatably fitted to the shaft 13 on the outside of one of the bearings 14a. A clutch element 18 corresponding to the element 17 is fixed to the shaft 13 with a screw 19. The posts 17a and 18a of the pixel elements 17 and 18 are brought into contact with each other, and the coil spring 20 is wound around the outer peripheral surfaces of the posts 17a and 18a.

When the drive shaft 13 is rotated in the direction of the arrow shown in FIG.
The coil spring 20 is moved by friction and tightened,
The roller 1 is driven via the clutch element 17. As mentioned above, when the roller 1 is rotated at a speed faster than the driving rotation speed, the post 17n slips with the spring 20, which is a one-way transmission mechanism. Therefore, the other bearing 14b is
Clutch element 1 by pressing it against thrust receiver 21 provided in
8 to the sleeve 13 with screws 19.
is correctly positioned on axis 13.

The other roller 2 is supported by a drive shaft 22, and the shaft 22 is connected to a branch shaft 23 by a pair of arms 25 which are swingable by bearings 24.
is supported via a bearing 26. By pushing down the swinging arm 25 using the adjusting screw 28 screwed into the fixing member 27 against a return spring (not shown), both rollers 1
Adjust the overlap a of the -2 rings.

The pair of swinging arms 25 are connected to the support shaft 23 and the thrust shaft 29
The drive shaft 22 is positioned and supported by the thrust stopper 32 of thrust receiver No. 31 on the swing arm 25.

Here, the drive shaft 22 rotates in the direction of the arrow shown in FIG. 2, and the roller 2 is also rotationally driven in the same direction. By driving the rollers l112, the sheets p are separated and fed one by one from the bottom.

In addition, as shown in Japanese Patent Application Laid-open No. 60-56742, a plurality of circumferential grooves of a required width and depth are provided at predetermined intervals p in a rigid cylindrical support made of metal or resin, and a disc-shaped rubber or the like is inserted into the grooves. Since the comb-toothed roller is formed by tightly fitting the elastic rings, the distance P between adjacent rings and @At of the roller are
has been obtained with high precision, and by providing a jig groove for thrust positioning of the two comb-teeth rollers on the rigid cylindrical support, it is possible to reliably feed the sheets one by one as explained above. It became possible to fully satisfy element (3).

〔Effect of the invention〕

By adopting the configuration as explained above, elements (1) to 1 for reliably sending out the sheets described above one by one.
Since it has become possible to satisfy (3), and in particular, it has become possible to satisfy element (3), it is possible to prevent paper feeding errors, skewed feeding, wrinkles, etc., and provide a stable paper feeding device. It became.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the present invention. FIG. 3 is a three-dimensional view showing the conventional embodiment, FIGS. 4 and 5 are partially enlarged views for explaining the conventional device, and FIG. 6 is a sectional view showing the conventional embodiment. 1 and 2 are comb-shaped rollers, 8-9 are rings, 6 fists 7 are cylindrical supports, 61-71 are circumferential grooves, 61-72 are jig grooves, 81 and 91 are the centers of rings 8 and 9 Hole, 99 is thrust set screw, 100 is jig

Claims (1)

[Claims] (1) A pair of comb-like rollers constructed by attaching a disk-shaped elastic ring to a rigid cylindrical support having a plurality of circumferential grooves, with its center hole fitting into the circumferential grooves. The rings constituting the comb teeth are arranged alternately and with a slight overlap in the diameter direction, and while the comb tooth rollers are rotated in the same direction, one end of the cut sheets loaded in both nips is applied. , in a device that separates and sends individual sheets,
The spacing accuracy between adjacent rings is improved by providing a circumferential groove for a jig in each of the cylindrical supports of the pair of comb-like rollers to determine the thrust direction position. A sheet material feeding device featuring: