JPH01321231A - Paper feeder - Google Patents

Abstract

PURPOSE:To perform handling for a paper jam and maintenance for internal members including a paper feed roller or the like in an easy manner by installing a resist base supporting a lower resist roller in a pair of resist rollers free of rotation. CONSTITUTION:An idler roller 40 getting over a projection 42 rotates as far as about 90 deg. as going along an incline at a tip of a push spring 41, and it stops on a base surface of a printer body. Simultaneously a resist base 19 so far engaged with the idler roller 40 is also released from its engagement and rotates in the same direction with a fulcrum shaft as the center, and stops on a lever unit 27. In addition, since a lower resist roller 13b is attached to the resist base 19 and an upper resist roller 13a is attached to a frame, an interval between both these resist rollers 13a, 13b is largely opened by rotation of the resist base 19, so that a sheet 12 causing a paper jam is dropped beneath.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper feeding device installed in an image reproducing device such as a copying machine that uses cut paper, and particularly relates to a paper feeding device installed in an image reproducing device such as a copying machine that uses cut paper. The present invention relates to a paper ejection type paper feeding device.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 58-1161, conventional image reproducing devices are generally of the so-called Kramschul type, in which the paper conveyance path from the paper feed cassette to the paper ejection is configured in a nearly straight line. there were. According to this method, it is easy to dispose of a single paper jam and to remove and replace consumables in the apparatus such as a replenishment toner cartridge in a developing section and a recovery toner cartridge in a cleaner section.

[Problem to be solved by the invention]

However, the above-mentioned conventional method is a paper feeding device configured to feed paper from the front of the device and eject paper from the rear, and there is a problem that it cannot be applied to an image playback device that feeds and ejects paper from the front. Ta.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a front paper feed/discharge type paper feeding device that allows easy handling of paper jams and maintenance of internal members such as paper feeding rollers. purpose.

[Means to solve the problem]

In order to achieve the above object, the present invention supplies paper from the front of the casing of an image reproducing device, guides the paper to the outer periphery of the drum via a paper guide, and guides the paper to the outer periphery of the drum using a pair of upper and lower registration rollers. Align the paper,
After reproducing an image on the paper on the drum, a paper feeding device that discharges the paper from the front surface of the casing is rotatably attached to the casing, and a lower registration roller of the pair of registration rollers is attached to the casing. a base member that is rotatably supported; a pair of paper guides that are rotatably supported via a bearing, one of which is fixed to the housing and the other that supports the lower registration roller; and a pair of paper guides that are rotatably supported by the housing; a shaft supported by the shaft and having a handle fixed to one end thereof; and a plurality of shafts each having one end fixed to the shaft and having a push spring elastically fixing the one paper guide and a roller pushing up the base member attached to the other end. It is constructed with two levers.

[Effect]

According to the above configuration, when the handle is rotated, the lever rotates integrally through the shaft.

The roller provided at the tip of this lever separates from the guide member that supports the lower registration roller. As a result, the guide member rotates following the lever.

At the same time, the push spring provided at the tip of the lever also separates from the paper guide, and this paper guide also rotates in the same direction. As a result, a large space is formed in the paper conveyance path, and jammed paper can be easily removed by hand. Additionally, the registration rollers and paper guides can be easily cleaned.

〔Example〕

An embodiment of a paper feeding device according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4.

FIG. 4 shows a schematic configuration of a laser beam printer equipped with a paper feeding device according to this embodiment. In FIG. 4, a charger 2. Developing device 3. Transfer units 4 are arranged in sequence and housed in a printer casing 5.

A paper discharge tray 6, an upper paper feed cassette 7, and a lower paper feed cassette 8 are each removably attached to the front surface of the housing 5 in order from the top. Further, a paper feed roller 9 made of high friction rubber and a separation member 10 made of rubber material are provided facing each other at the ends of the housing 5 of these paper feed cassettes 7.8. is spring 11
The sheet is pressed against the paper feed roller 9 by the paper feed roller 9. Further, between the paper feed roller 9 and the photosensitive drum 1, a pair of rollers are provided for feeding and guiding either one of the doses 12 deposited in the paper feed cassette 7.8 to the photosensitive drum 1. Registration rollers 13 and paper conveyance path 14 are provided. Further, a pair of fixing rollers 15 are provided between the photosensitive drum 1 and the paper discharge tray 6.

In the laser beam printer configured as described above, first, the surface of the photosensitive drum 1 is uniformly charged by the charger 2. Next, a laser beam generator 1 provided inside the housing 5
A predetermined image is exposed on the surface of the photosensitive drum 1 by a laser beam 17 emitted from a laser beam 17 to form a charge latent image, and this charge latent image is developed by a developing device 3 into a visible toner image. On the other hand, one of the sheets of paper 12 stacked in the paper feed cassette 7.8 is held between the paper feed roller 9 and the separation member 10, separated one by one, and supplied to the registration rollers 13. be done. The registration rollers 13 feed the paper 12 to the outer periphery of the photosensitive drum 1 via the paper conveyance path 14 and bring it into contact with the transfer timing with the visible image formed on the surface of the photosensitive drum 1 . Then, a transfer bias is applied by the transfer device 4 to transfer the visible image made of the toner image on the photosensitive drum 1 onto the paper 12. Paper 1 after transfer
2 is thermally fixed when passing through the fixing roller 15 and is discharged onto the paper discharge tray 6.

Next, let's talk about the paper feeding device, which is a feature of this embodiment.

This will be explained in detail with reference to FIGS. 1 and 2. As described above, the paper 12 sent out one by one by the paper feed roller 9 and the separation member 10 is transferred to the paper feed roller 9 and the registration roller 13.
The paper feed guide 18 and the resist base 1 provided between the paper feed guide 18 and the resist base 1
The paper 12 is fed between the paper 12 and the paper 9, and stops when it hits a contact portion between a pair of upper and lower registration rollers 13a and 13b that constitute the registration rollers 13. The resist base 19 is rotatably supported via support shafts 21 attached to a pair of left and right frames 20, respectively. Further, both ends of the upper registration roller 13a are rotatably supported by the left and right frames 20 through bearings 22, respectively, and both ends of the lower registration roller 13b are supported by the registration base 1 through bearings 23, respectively.
9 is rotatably supported. The bearings 23 of the lower registration rollers 13b are formed on the frame 20, fit into the slits 20a, and are slidably guided, thereby ensuring the positional accuracy of the lower registration rollers 13b. Further, the bearing 23 is elastically held by the other end of a pressure spring 24 whose one end is fixed to the resist base 19.
Appropriate pressing force is applied between the upper registration roller 13a and the lower registration roller 13b.

The paper conveyance path 14 includes a pair of paper guides A25 and B
Both side plates of the one-paper guide A25, which are configured to face each other and the two paper guides A26, respectively rotatably support the outer periphery of the bearing 23, and one end is connected to a push spring A28 attached to a lever unit 27, which will be described later. By the other end, the paper guide A2
5 is pressed against the paper guide 826. At the exit of the paper conveyance path 14, a lower reversing roller 29, a lower reversing roller 30, a reversing guide 31, and a transfer guide 32 are provided, respectively, to properly transport the paper 12 to the photosensitive drum 1. .

Next, the lever unit 27 configured at the lower part of the resist base 19 will be explained. This lever unit 2
7 is attached to a shaft 34 rotatably supported by a pair of left and right frames 20 via bearings 33, respectively. That is, one end of the lever 35 constituting the pair of left and right lever units 27 is fixed to the shaft 34 by a screw 36 inside the frame 20, and a handle 37 is attached to one end of the shaft 34 protruding outside the frame 20. are fixed by screws 38. Further, at the other end of the lever 35, the push spring A28 and the idler roller 40 are each rotatably supported via a support shaft 39.

One end of the push spring A28 is locked to the lever 35L, and the other end is elastically in contact with the paper guide A25.

Further, the other end of a push spring B41 whose one end is fixed to the resist base 19 is elastically in contact with the idler roller 40, and the other end of this push spring B41 has a protrusion 42 having a detent function. It is formed.

Next, regarding the operation of this embodiment configured as described above,
This will be explained with reference to FIGS. 2 and 3.

FIG. 2 shows a normal state in which paper is fed, and FIG. 3 shows a processing state when a paper 12 jams between the paper feed roller 9 and the lower reversing roller 30. If a paper jam occurs in the normal state shown in FIG. 2, first rotate the handle 37 shown in FIG. 1 in the direction of arrow y. Then, the lever unit 27 coaxially fixed via the handle 37 and the shaft 34 also begins to rotate in the same direction as the handle 37, and the idler roller 40 is moved by the push spring B.
The push spring B41 is elastically deformed so as to ride over the protrusion 42 having a detent function. This protrusion 42
The idler roller 40, which has climbed over this point, rotates approximately 90 degrees while following the slope 43 at the tip of the push spring B41, and stops at the base surface of the printer body as shown in FIG. At the same time, the resist base 19 was locked to the idler roller 40.
The lock is released, the lever rotates in the same direction about the support shaft 21, and stops on the lever unit 27.

Further, the lower registration roller 13b is attached to the registration base 19, and the upper registration roller 1 to the opening roller 13a are attached to the frame 20, so that the registration base 19 is attached to the lower registration roller 13b.
As a result of the rotation, the gap between both registration rollers 13a and 13b is widened, and the jammed paper 12 falls downward.

On the other hand, the paper guide A25 to which the bearing 23 that supports the lower registration roller 13b is attached is also locked to the lever unit 27 via the push spring A28, so that the lock is released by rotation of the lever unit 27. . As a result, the paper guide A25 rotates around the bearing 23 and becomes substantially parallel to the resist base 19 as shown in FIG. Then, the paper conveyance path 14 is also wide open, the leading end stops within the paper conveyance path 14, and the paper 12 simultaneously falls downward. As described above, a large space is obtained in the paper path system, and the paper 12 can be easily pulled out in the direction of arrow Z. At the same time, the upper and lower registration rollers 13a, 13b and the paper guide A25. Stains caused by paper dust generated on the B26 can be easily cleaned.

If the leading edge of the paper 12 has reached near the photosensitive drum 1, hold the paper edge of the paper 12 stuck to the paper guide B26, pull it out downward, and then pull it out in the direction of arrow Z in the same manner as above. It can be pulled out.

Next, the operation of returning from the state shown in FIG. 3 to the initial state shown in FIG. 2 will be described.

First, when the handle 37 is rotated in the direction opposite to the direction indicated by the arrow Y, the idler roller 40 first rotates the registration base 19 while rolling on the slope of a roller guide 44 formed integrally with the registration base 19. When the handle 37 is further rotated in the same direction, the idler roller 4o moves to the slope portion 43 of the push spring B41 and further pushes up the resist base 19 while rolling in the same manner.

When the lower registration roller 13b contacts the upper registration roller 13a, the registration pressure spring 24 is elastically deformed to apply a constant pressing force. Then, a positioning protrusion (not shown) of the registration base 19 comes into contact with the paper feed guide 18 and stops. Further, the idler roller 40 rides over the protrusion 42 of the push spring B41 and stops at a predetermined position. This protrusion 42 functions to prevent the idler roller 40 from returning, and the state shown in FIG. 2 can be maintained. In addition, the operability of the handle 37 is improved by the biasing forces of the protrusion 42 and the push spring B41, and the end of rotation of the handle 37 can be clearly seen, giving a feeling of clinic operation.

On the other hand, the paper guide A25 is pushed upward by the push spring A28 that slides in contact with the left and right rib portions, and the bearing 2
3, and the protrusion at the top is the paper guide B26.
The paper guide A25 is positioned by coming into contact with the paper guide A25. Further, the appropriate pressing force of the push spring A28 prevents the position of the paper guide A25 from changing due to the paper 12.

According to this embodiment, since the lower registration roller 13b and the paper guide A25 can be rotated together, the paper jam of the paper 12 that occurs between the paper feed roller 9 and the thermal drum 1 can be easily removed. can be processed. Furthermore, maintenance of the registration rollers 13 and paper guides 25, 26 becomes easier.

Furthermore, since the resist base 19 is provided with a push spring 41 having a protrusion 42 for preventing return, the operability of the handle 37 is improved.

Note that the detailed structure of each part described in the above embodiments may be changed in design without departing from the spirit of the present invention.

〔Effect of the invention〕

As explained above, according to the paper feeding device according to the present invention, the registration roller and the paper guide can be rotated together via the lever fixed to the shaft, so that paper jams generated in the device can be avoided. Processing and maintenance of registration rollers and paper guides can be easily performed. Furthermore, this paper feeding device is capable of feeding and discharging paper from the front.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part showing an embodiment of a paper feeding device according to the present invention, FIGS. 2 and 3 are sectional views of main parts showing the operation of this embodiment, and FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a laser beam printer equipped with a paper feeding device according to the present invention. 1... Photosensitive drum, 5... Housing, 12... Paper,
13... Registration roller, 19... Registration base (base member), 23... Bearing, 25.26... Paper guide, 28... Pressing spring, 34... Shaft, 3
5...Lever, 37...Handle, 40...Idler roller.

Claims (1)

[Claims] 1. Paper is supplied from the front of the casing of the image reproducing device, guided to the outer periphery of the drum via a paper guide, and a pair of upper and lower registration rollers is used to control the paper on the outer periphery of the drum. After positioning and reproducing an image on the paper on the drum, a paper feeding device that discharges the paper from the front of the casing is rotatably attached to the casing, and a pair of registration rollers are mounted on the casing. A paper feeding device comprising a resist base rotatably supporting a lower resist roller. 2. The paper feeding device according to claim 1, further comprising a pair of paper guides, one of which is fixed to the housing and the other of which is rotatably supported via a bearing that supports the lower registration roller. 3. A shaft that is rotatably supported by the housing and has a handle fixed to one end, a push spring that has one end fixed to the shaft and elastically fixes one paper guide to the other end, and a roller that pushes up the base member. 3. The paper feeding device according to claim 1, further comprising a plurality of levers respectively attached to the levers.