JPH047230A - Paper feeder - Google Patents

Abstract

PURPOSE:To avoid twisting of a manipulating pad relating to a holding member by providing a pressing member, attached to right/left symmetrical two points in a back part of the manipulating pad, and applying energizing force in a paper feed means side to an intermediate point between the two points of this pressing member through a hinge connection part. CONSTITUTION:Energizing force, which energizes a slidably held manipulating pad 51 to a side of feed means 47 to 49, is applied to a single point in the back part of a pressing member 66 through a hinge connection part without restricting attitude. Consequently, the pressing member 66 equally presses right/ left symmetrical two points of the manipulating pad 51 by attaching parts of the right/left symmetrical two points surely to a back part of the manipulating pad 51 relating to the single point, where the energizing force is applied, and mechanically dispersing the energizing force, applied on the single point,to the two points. In this way, a total unit of the manipulating pad 51 can be equally brought into press contact with the feed means 47 to 49. A twist between the manipulating pad 51 and a holding member 62 can be eliminated by applying correcting force to the manipulating pad 51 to its proper attitude.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device used in copying machines, printers, etc., and more specifically, a feeding means for feeding a sheet in contact with one side thereof, and this feeding means. The present invention relates to a paper feeding device that feeds stacked sheets one by one, and includes a handling pad that is supported and urged so as to come into pressure contact with the feeding surface of the sheet.

Prior Art FIG. 3 shows a typical conventional example of this type of paper feeding device. In this device, a sorting pad a is held slidably toward a feeding roller C by a holder b, and a spring d is applied to the center of the back of the sorting pad a in the left-right direction to urge it to come into pressure contact with the feeding roller C. ing. Furthermore, in Japanese Patent Application Laid-open No. 62-70131, a holder holds a holder in a slidable manner, and a holder pad is slidably held by a holder, and a plate spring acting between the holder and the holder pad is used to feed the holder. A device is disclosed that is biased toward the heald side.

Problems to be Solved by the Invention However, the above-mentioned conventional handling pads sometimes get twisted with the holder, resulting in insufficient pressure contact with the feeding means,
Pressure welding becomes uneven on the left and right sides, causing poor handling and jams.

This is because with conventional handling pads that are slidably held, the biasing force is only applied to that point, so even if the biasing point is in the center, it acts equally on the left and right sides of the handling pad. This is caused by the fact that the separation pad sometimes changes its position in various ways while in contact with the feeding means and the sheets fed thereto, and the biasing force of the spring acts eccentrically with respect to the separation pad.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a paper feeding device that can solve the above-mentioned conventional problems by improving the structure for biasing the separating pad toward the feeding means.

Means for Solving the Problems In order to achieve the above-mentioned problems, the present invention provides a feeding means for feeding a sheet in contact with one surface thereof, and a support so as to be in pressure contact with the feeding surface of the feeding means. and a biased separation pad, the separation pad is slidably held toward the feeding means, and a pressing member is provided that abuts on two symmetrical points on the back of the separation pad. The present invention is characterized in that a biasing force toward the sheet feeding means is exerted at an intermediate point between the two points of the pressing member via a hinge connection portion.

Operation According to the above structure of the present invention, the biasing force that biases the slidably held sorting band toward the feeding means is applied to one point on the back of the pressing member through the hinge connection portion without posture restriction. . Therefore, the urging force acts on the pressing member (the two points that are symmetrical with respect to the - point reliably contact the back of the separating member, and the urging force acting on the - point is mechanically dispersed to the two points). It is possible to evenly press the two symmetrical points of the handling member, the whole of the handling band can be brought into equal pressure contact with the feeding means, and a correcting force is exerted on the handling pad to correct its posture. It is possible to eliminate the strain between the handling band and the holding member.

Embodiment A paper feeding device as an embodiment of the present invention shown in FIGS. 1 and 2 will be described below.

FIG. 1 shows a copying machine equipped with a paper feeding device according to the present invention. This copying machine has an exposure optical system 1, and an image is formed by exposure by the exposure optical system 1, and the image is transferred to a transfer sheet 2.
The image forming mechanism 3 includes an image forming mechanism 3 that transfers the image to the image forming mechanism 3, and a paper feeding mechanism 4 that feeds the transfer sheet 2 to the image forming mechanism 3. The exposure optical system 1, image forming mechanism 3, and paper feeding mechanism 4 are individually housed in independent optical system box 6, image forming box 7, and paper feeding box 8, respectively. The boxes 6 to 8 are stacked and connected to form a fuselage 9.

The exposure optical system 1 includes a lamp 13 that is supported by a first slider 12 that moves under a platen glass 11 to scan an original on the platen glass 11, a first mirror 14, a second slider 15, and a third slider 16. The second to fifth mirrors 17 to 20 move to keep the optical path length constant.
, a projection lens 21 provided between each of the third and fourth mirrors 18 and 19, and a sixth mirror 22 that performs optical path length correction during zooming by moving the projection lens 21 in the optical axis direction.

The image forming mechanism 3 includes a photosensitive drum 31, a charging charger 32 disposed around the photosensitive drum 31, a developing device 33, a transfer charger 34, a separation charger 135, and a cleaning device 2136.
etc., and a photosensitive drum 31 using a known electrophotographic method.
A toner image corresponding to the original image to be exposed is formed thereon, and the toner image is transferred to the transferred transfer sheet 2. In front of the transfer section where the photosensitive drum 31 and the transfer charger 34 face each other, there is provided a paper feed conveyance path 35 for feeding the transfer sheet 2 received from the paper feed box 8 to the transfer section, and a timing roller is provided on the way. 36 are provided. The timing roller 36 is fed the transfer sheet 2 in a stopped state, and corrects the skew of the transfer sheet 2 by aligning its leading edge, and adjusts the timing of feeding the transfer sheet 2 to the transfer section depending on when to start conveyance. .

After the transfer unit, there is a conveying device 37 that conveys the transfer sheet 2 after transfer while adsorbing it to a ventilation belt, a fixing device 38 that performs a fixing process on the transfer sheet 2 conveyed by the conveying device 37, and a conveying device 38 that carries out a fixing process on the transfer sheet 2 conveyed by the conveying device 37. A paper ejecting roller 39 is provided to eject the incoming transfer sheet 2.

The paper feeding mechanism 4 has three paper feeding sections 41 to 43 that accommodate transfer sheets 2 of different sizes and selectively feed them. Each paper feed unit 41 to 43 has a paper feed cassette 44 to
Pickup roller 4 that sends out the transfer sheet 2 in 46
7 to 49, and a handling band 51 for handling the transferred transfer sheets 2 one by one. Each paper feed section 41 to 43
Each of the blocks is divided into blocks, and the blocks can be exchanged by exchanging two blocks for one block for multiple sheets. Each paper feed section 41 to 43
The paper feed cassettes 44 to 46 are of a front loading type in which they are inserted and removed from the front side of the machine body 9, which in FIG. 1 is from the front side of the page.

The handling pad 51 is made of a material having a large friction coefficient, such as rubber, and is attached to a base 61 as shown in FIG. A plate-shaped sliding leg 61a is provided protruding from the back surface of the base 61. The sliding legs 61a are fitted and held in guide grooves 63 provided on the left and right sides of a holder 62 fixed at a proper position in the paper feed box 7 so as to be vertically slidable. Holder 6
2, the handling pad 51 is pink unroller 47-49
A pressing lever 64 is pivotally supported by a shaft 65 to be brought into pressure contact with each of the. This pressing lever 64 is biased counterclockwise in FIG. 2 by a spring 68 acting between its lower end and the holder 62. A pressing member 66 is pivotally supported at the upper end of the pressing lever 64 by a shaft 67, so that a pressing action of the pressing lever 64 by the biasing force of the spring 68 is applied to the handling pad 51.

The pressing member 66 has convex portions 66a and 66b that abut on the back of the handling pad 51 as shown by arrows in FIG. As a result, the pressing member 66 receives the pressing force from the pressing lever 64 at the pivot point formed by the shaft 67 without any posture restriction, and the two convex portions 66a and 66b reliably abut the two places on the back surface of the sorting band 51. is brought into pressure contact with the pink up rollers 47 to 49.

At this time, the pressing member 66 mechanically distributes the pressing force received at the pivot point by the shaft 67 to the two points of the convex portions 66a and 66b, and applies it equally to the two rear surfaces of the sorting pad 51.

The two points of the sorting pad 51 that receive this pressure are also positioned symmetrically with respect to each other, and the whole of the sorting pad 51 is evenly pressed against each of the pick-up rollers 47 to 49.

Therefore, the handling pad 51 is
The transfer sheet 2 can be successfully separated between the transfer sheet 49 and the transfer pad 51. Also, since the transfer pad 51 is evenly pressed at two symmetrical points on itself, it does not cause twisting, and the transfer pad 51 is pink. Even if the posture of the up rollers 47 to 49 or the transfer sheet 2 fed thereto changes in various ways, the handling pad 51 can correct the change without causing twisting. Problems such as poor pressure contact with the amplifier rollers 47 to 49 and uneven pressure contact force are eliminated.

The present invention is not limited to the above embodiments, but can be implemented in various ways. For example, the spring 65 may be applied directly to the pressing member 66, and in this case, the point of application of the spring 65 to the pressing member 66 may be a hinge connection with the pressing member 66 by a shaft; Even if the pad 51 is simply fitted into the recess or protrusion provided on the back of the pad 51, the handling pad 51 can be pressed in the same manner as described above without restricting its movement by the pressing member 66.

Moreover, any form of spring can be adopted as long as it can act in the same manner as described above for the spring acting on the pressing member 66.

Furthermore, the present invention can be applied to cases where sheets are fed by a device other than an image forming apparatus.

Effects of the Invention According to the present invention, the biasing force that biases the slidably held handling pad toward the feeding means is applied to a point on the back of the pressing member via the hinge connection portion without posture restriction; The pressing member has two portions that are bilaterally symmetrical to the one point on which the urging force is applied, and reliably abuts the back of the handling member, and mechanically disperses the urging force acting on the − point to the two points to separate the handling member. Since the two symmetrical points on the left and right sides are pressed evenly, the whole of the picking pad can be evenly pressed against the feeding means, and the picking pad is pressed against the holding member by exerting a force to correct the proper posture of the picking pad. Since it is also possible to avoid straining the handling pad against the feeding means, it is possible to exhibit a stable handling function at all times without defective or uneven pressure contact between the handling pad and the feeding means.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a copying machine having a paper feeding device as an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing main parts exploded, and FIG. 3 is a perspective view showing a conventional example. It is. 61a −−−−−−−・−・・−・・−Sliding leg 62−
−−−−−1・−・−・−・−Holder 63−−−−
−−・−−−−−−・−−−−11−−−Guide groove 64
・−−１１１−・−・−−−−−−−−−−1・−Press lever 65−・−・・−・−・−・−・−Shaft 66−−−−−−−−− -------------- Pressing members 66a, 66b ---- One convex part

Claims (1)

[Claims] (1) a feeding means for feeding the sheet in contact with one side thereof;
In a paper feeding device equipped with a sorting pad supported and urged so as to come into pressure contact with the feeding surface of the feeding means, the sorting pad is slidably held toward the feeding means, and the sorting pad is held in a slidable manner. A paper feeding device characterized in that a pressing member is provided which abuts on two symmetrical points on the back, and a biasing force toward the paper feeding means is applied to an intermediate point between the two points of the pressing member via a hinge connecting portion. Device.