JPH0243136A - Single-side based paper feeding device - Google Patents

Abstract

PURPOSE:To unnecessitate a side drawing roller as well as to perform the side drawing of paper simply by providing a means for having the timing of the paper coming off a par of claws differed such that the paper delivered onto the paper feeding passage side is inclined toward the side of a guide wall by a paper feeding roller. CONSTITUTION:The paper 24 at the upper end in a paper storage space is delivered onto the paper feeding passage side from a paper exit 31 by the rotation of a paper feeding roller 23. In this paper delivery, the front end angle of the paper 24 is at first engaged with separating claws 34, 35, but the paper 24 is released from the separating claws 34, 35 in due time. At this time, the timing of the paper coming off from the one claw 34 precedes the timing of the paper coming off from the other claw 35 by the action of the front and back collars 41, 42. As a result, the paper 24 delivered to the paper feeding passage side are inclined toward the side of a guide wall 43. The paper 24 is thus delivered being drawn to the side of the guide wall 43 and conveyed on the paper feeding passage along the guide wall 43.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device, and particularly to a one-sided reference paper feeding device that feeds paper based on one side of a conveyance path.

[Conventional technology]

For example, in an image forming apparatus such as a copying machine, a paper feeding device for supplying recording paper is provided to the main body of the apparatus. As a conventional paper feeding device of this kind, a one-sided reference paper feeding device as shown in FIG. 8 is known.

In FIG. 8, there is a paper feed path 5 between the photosensitive drum 51 on the image forming apparatus side and the paper feed cassette 52 on the paper feed device side.
3 is placed. The paper 5 is placed on one side of the paper feed path 53.
A guide plate 55 for positioning the paper 4 during transportation is arranged at a transportation reference position. A registration roller 56 is arranged at an intermediate position of the paper feed path 53 for timing the supply of the paper 54 to the photosensitive drum 51. Further, a separation belt 57 is provided on an extension of the guide plate 55.

Furthermore, this one-sided reference paper feeding device includes a paper feeding cassette 52.
A biasing roller 58 is provided for aligning the paper sent from the paper feed path 53 to the paper feed path 53 along the guide plate 55. The rotation axis of this biasing roller 58 is tilted, thereby shifting the paper 54 toward the guide plate 55 and moving the paper 54 toward the guide plate 55.
Transport the product in contact with the

[Problem to be solved by the invention]

In the conventional one-side reference paper feeder, special members include:
It is necessary to provide a biasing roller and a mechanism to drive it. This causes problems in that the device becomes complicated and the manufacturing cost increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a one-sided reference paper feeding device that eliminates the need for a shifting roller, realizes shifting of sheets with a simple configuration, and can reduce manufacturing costs.

[Means to solve the problem]

The one-sided reference paper feeding device according to the present invention includes a paper storage section, a paper feeding roller, a paper feeding path, and means for varying the timing at which the paper comes off from the claw.

The paper storage section stores a large number of stacked sheets of paper, and has a pair of separating claws at the paper exit section that temporarily locks the front end corners of the sheets. The paper feed roller is disposed above the paper storage section, and rotates so as to send out the upper end paper from the paper exit section.

The paper feed path is disposed on the paper exit side and has a guide wall for aligning the paper along one side of the reference position. The means differs the timing at which the paper is removed from the pair of claws so that the paper sent out toward the paper feed path by the paper feed roller is tilted toward the guide wall.

[Effect]

In the one-sided reference paper feeder according to the present invention, the paper feed roller rotates, so that the upper end paper in the paper storage unit is sent out from the paper exit portion to the paper feed path side. In this paper feeding, the front end corner of the paper is initially locked by the separation claw, but eventually the paper comes off from the separation claw. At this time, since the timing at which the paper comes off from one claw and the timing at which the paper comes off from the other claw are different, the paper sent out to the paper feed path side is tilted toward the guide wall side. As a result, the paper is fed out closer to the guide wall, and is further conveyed along the paper feed path along the guide wall.

Therefore, according to the one-sided reference paper feeding device according to the present invention,
This eliminates the need for a conventionally required shifting roller, and allows paper to be shifted to one side with a simple configuration.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partial cross-sectional view of a copying machine equipped with a paper feeding device according to an embodiment of the present invention. A document holder 2 is provided on the upper surface of the copying machine main body 1 so as to be openable and closable. Also, on the right side of the main body 1 in the figure, there is a paper feed tray 3 for bypass paper feeding.
A paper discharge tray (not shown) is disposed on the left side of the main body 1 in which the paper feed cassette 4 is disposed.

Inside the main body 1, an optical system 7 is provided above the main body 1, and in the center thereof, a photosensitive drum 9 is provided which is exposed by the optical system 7 to form an electrostatic latent image. Around the photoreceptor drum 9, there is a main charging corona discharger 10 that charges the surface of the photoreceptor drum to a predetermined charge, and a corona discharger 10 for charging the photoreceptor drum surface to a predetermined charge.
a developing device 11 for developing an electrostatic latent image, a transfer corona discharger I2 for transferring the toner image onto paper, and a separation belt 13 for separating the paper from the surface of the photoreceptor drum;
A cleaning device 14 for removing residual toner and the like on the photoreceptor drum is provided.

A paper feed path 20 is arranged between the image forming section including the photosensitive drum 9 and the like and the paper feed tray 3 for supplying paper from the paper feed tray 3 to the image forming section. Further, a paper feed path 21 is arranged between the image forming section and the paper feed cassette 4 for supplying paper from the paper feed cassette 4 to the image forming section. Registration rollers 22 are provided at the merging portion of the paper refeeding path 20.21 to supply the paper to the image forming section at a predetermined timing. Further, a paper feed roller 23 is arranged above the paper feed side portion of the paper feed cassette 4 for feeding the paper in the cassette to the paper feed path 21 side. The paper feed roller 23 is driven to rotate at a predetermined timing, and is able to come into pressure contact with the upper end surface of the sheets 24 stacked and stored in the paper feed cassette 4.

On the other hand, on the downstream side of the image forming section, a conveyance mechanism 25 for discharging the paper toward a fixing device (not shown) is arranged.

As shown in FIG. 2, the paper feed cassette 4 includes a cassette main body 30 that is a rectangular plate-shaped member. Inside the cassette main body 30, a cassette plate 32 is arranged on the paper outlet section 31 side. The cassette plate 32 is always elastically biased upward by a cassette spring 33 arranged below.

On the paper exit section 31 side, a cassette front claw 34 and a cassette rear claw 35 are provided at a pair of upper corner portions of the cassette main body 30 . When the paper 24 (FIG. 1) is not stored, the cassette plate 32 is in contact with the claws 34 and 35, so that the cassette 32 is tilted from the center of the bottom of the paper feed cassette 4 toward the paper exit section 31. It is held in the same position.

When the paper 24 is stored in the paper feed cassette 4, the third
As shown in the figure, a pair of upper end corners of the paper 24 are placed between the claws 34 and 35 and the cassette plate 32.

As shown in FIG. 4, the paper feed roller 23 is disposed at the center in the width direction of the paper feed cassette 4, and has a rotation center axis 40 extending in the width direction of the paper feed cassette 4. As shown in FIG. In the vicinity of the claws 34 and 35 of the paper feed cassette 4, there is a
A pair of front collars 41 and rear collars 42 are fixed.
Both collars 41 and 42 have a diameter smaller than the diameter of the paper feed roller 23, and have an approximately half-moon shape with a portion of a disc cut out, as shown in FIG. ing.

Also, the cutout surface 41a of the front collar 41 is closer to the rear collar 42.
It is arranged at a position further forward than the notch surface 42a with respect to the rotation direction (direction of the arrow). That is, both colors 4
The installation phase angles are different between 1.42 and 42.

As shown in FIG. 4, a guide wall 43 is provided on the back side (right side in the figure) of the paper feed path 21 extending from the outlet portion 31 of the paper feed cassette 4 to define a reference position on one side during paper feeding. ing. This guide wall 43 extends along the conveyance path 21 from the registration roller 22 (FIG. 1) to the image forming section, and is regulated in a predetermined position by the paper 24 conveyed through the paper feed path 21 slidingly in contact with the guide wall 43. It is now possible to do so.

Next, the paper supply operation will be explained.

When the copying machine shown in FIG. 1 starts a copying operation, the paper feed roller 23 rotates in the direction of the arrow at a predetermined timing while being in pressure contact with the paper 24, as shown in FIG. 3. As the roller 23 rotates, the uppermost sheet of the stacked sheets 24 is sent out from the sheet exit section 31. At this time, first, since the pair of corners of the paper 24 are locked by the claws 34.35, the paper 24 is held by the claws 34.35.
At this time, the color 41°4 is bent between the paper feed roller 23 and the paper feed roller 23.
2, the cutout surfaces 41a and 42a are located opposite the paper 24. As shown in FIG. 6, when the paper 24 is bent to a certain degree, the cutout surface 41 of the collar 41, 42
a, 42a or the arc portion abuts against the paper 24.

When the paper feed roller 23 further rotates, the degree of deflection of the paper 24 increases. At this time, the notch surface 4 of the front collar 41
1a is located at a position further forward in the direction of rotation (direction of the arrow) than the notch surface 42a of the rear collar 42, so that the notch surface 41a or the circular arc portion continuous therewith is located on the paper 24. The timing of pressing the bent portion is slightly earlier than the timing of pressing the notch surface 42a or the circular arc portion continuous thereto. Therefore, the paper 24 comes off from the square front claw 34 as shown in FIG. The posture is leaning toward the wall 43 side. The paper 24 is then removed from the rear claw 35 as shown by the two-dot chain line, and is transferred to the paper feed path 21.
sent to.

When the paper 24 comes into contact with the guide wall 43, the paper 24 is conveyed along the paper feed path 21 in sliding contact with the guide wall 43,
The paper 24, on which the toner image has been transferred at the image forming section shown in FIG.
is separated from the photoreceptor drum 9 and transported by the transport mechanism 25.

Next, other embodiments will be described.

(A) In the embodiment described above, the timing at which the flexible portion of the paper is pressed is varied by the notch, and the timing at which the paper 24 comes off from the pair of claws 34 and 35 is varied, but the means for varying this timing is as follows: A configuration may be adopted in which the diameter of the front collar 41 is set larger than the diameter of the rear collar 42.

In this case, the front collar 41, which has a larger diameter, presses the paper 24 earlier and more forcefully than the rear collar 42, so
The paper 24 first comes off the front claw 34 and assumes an attitude tilted toward the guide wall 43. In this case, a cutout surface similar to that of the above embodiment may be provided, and there is no need to provide a cutout surface.

(B) The front collar 41 and the front claw 34 are used as means for varying the timing at which the paper 24 comes off from the pair of claws 34 and 35.
A configuration may be adopted in which the distance between the rear collar 42 and the rear claw 35 is set smaller than the distance between the rear collar 42 and the rear claw 35.

In this case, the paper 24 first comes off from the front claw 34 that is closest to the collar, and the paper 24 assumes an attitude tilted toward the guide wall 43 side.

(C) As a means for varying the timing at which the paper 24 comes off from the pair of claws 34.35, instead of adding a device to the collars 41 and 42, the timing is varied by changing the shape of the claws 34.35. You can do it like this.

That is, as shown in FIG. 9, if the front claw 34'' is formed shorter than the rear claw 35 in the paper feeding direction (longitudinal direction of the paper), when the paper 24 bends to a certain extent, the front claw 34'' The leading edge of the paper 24 comes off the front claw 34 first and is tilted toward the guide wall (not shown) (to the right in the figure).The paper 24 then comes off the rear claw 35 and is sent to the paper feed path. Note that the shape of the front claw 34' portion shown by the two-dot chain line is the same shape as the rear claw 35.

〔Effect of the invention〕

As described above, according to the present invention, a means is provided to vary the timing at which the paper comes off from the pair of claws so that the paper sent out to the paper feed path by the paper feed roller is tilted toward the guide wall. This eliminates the need for a previously necessary shifting roller, and allows paper to be shifted to one side with a simple configuration. Therefore, according to the present invention, it is possible to reduce the manufacturing cost of the one-sided reference sheet feeding device.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a copying machine equipped with a paper feeding device according to an embodiment of the present invention, FIG. 2 is a perspective view of a paper feeding cassette,
Figure 3 is a vertical cross-sectional partial view of the vicinity of the paper feed roller, and Figure 4 is a partial vertical cross-sectional view of the area near the paper feed roller.
Figure 5 is a partial longitudinal cross-sectional view near the collar, Figure 6 is a perspective partial view showing one operating state near the paper feed roller, and Figure 7 is another operation near the paper feed roller. 4th to indicate status
FIG. 8 is a plan view schematically showing a conventional one-sided reference sheet feeding device, and FIG. 9 is a view showing another embodiment of the present invention. 4...Paper feed cassette, 21...Paper feed path, 23...
・Paper feed roller, 24...Paper, 31...Paper exit section, 34°34'', 35...Claw, 41.42...Collar, 41a. 42a...Notch surface, 43...・Guide wall. Fig. 2 1 et al. Patent applicant Sanda Kogyo Co., Ltd. 5] Fig. l Fig.

Claims (1)

[Claims] (1) A paper storage section that stores a large number of stacked sheets of paper and has a pair of separating claws at the paper exit section that temporarily locks the downstream end corners of the paper in the paper feeding direction; and the paper storage section. a paper feed roller arranged above and rotating so as to send out the upper end of the paper from the paper exit section; and a guide arranged on the paper exit section side for aligning the paper along one side reference position. a paper feed path having a wall; and means for varying the timing at which the paper comes off from the pair of claws so that the paper fed to the paper feed path by the paper feed roller is tilted toward the guide wall; One side reference paper feeder with.