JPS61114936A - Paper feeder of electrostatic photographic printer - Google Patents

Abstract

PURPOSE:To largely reduce the installation space of a frame by forming the frame with a base and a cover, providing a paper feeding cassette and a paper feeding roller on the cover, and connecting and providing a paper feeding section and a motor on the base respectively. CONSTITUTION:A paper feeding cassette 20 and a paper feeding roller 22 are provided on a cover 3, and a paper feeding section 18 feeding the paper 28 extracted between a photosensitive body 8 and a copying section 11 from the paper feeding cassette 20 and a motor 30 are connected to each other and provided on a base 2. In addition, a drive gear 33 connected to the motor 30 is provided on the base 2, and a driven gear 39 removably engaged with this drive gear 33 is connected to the paper feeding roller 22 and provided on the cover 3. Therefore, when the cover 3 is closed, the drive gear 33 and the driven gear 39 are engaged, and the rotation of the motor 30 is transmitted to the paper feeding section 18 and the paper feeding roller 22. Accordingly, the paper feeding cassette 20 can be installed on the cover 3, thus the installation area can be reduced.

Description

[Detailed description of the invention] Industrial applications This invention relates to a paper feeding device for an electrostatographic printer.

Conventional technology What is the paper feeding method for traditional electrostatographic printers?

Generally, this is done by attaching a paper feed force sensor 1 to the side of the printer housing.

Problems to be Solved by the Invention Therefore, there is a drawback that the paper feed cassette largely protrudes from one side of the housing, resulting in a large installation area.

Some models have a paper cassette placed at the bottom of the housing, but since the vertical installation distance between the transfer unit and the paper cassette is small, the paper pulled out from the paper cassette is bent with a small radius of curvature to make a U-turn. There must be. For this reason, it is difficult to advance the paper straight between the photoreceptor and the transfer section, which poses a problem that may impede printing.

This invention was made in view of these points.

To provide a paper feeding device for an electrostatic photographic printer that can greatly reduce the installation area and drive a paper feeding roller and a paper feeding section without increasing the number of motors.

Means for Solving the Problems In the present invention, a base 2 and a cover 3, which are connected to each other so as to be rotatable in a vertical plane, form a housing l, and a paper feed cassette 20 and a paper feed cassette are mounted on the upper surface of the cover 3. A roller 22 is provided, and a paper feeding section 18 and a motor 30 for sending paper 28 drawn out from the paper feed cassette 20 between the photoreceptor 8 and the transfer section 11 are connected to each other and provided on the base 2. 30
A drive gear 33 connected to the drive gear 33 is provided on the base 2, and a driven gear 39, which is removably engaged with the drive gear 33, is connected to the paper feed roller 22 and is provided on the cover 3.

In addition, a movable body 37 is provided on the cover 3 so as to be able to slide downwardly, and a pulley 38 and a driven gear 39 connected to the paper feed roller 22 by a belt 42 are attached to the movable body 37 so as to integrally rotate. establish.

Effect: Therefore, the paper feed cassette 20 does not protrude significantly from the side of the housing 1, and the installation area can be significantly reduced. The cover 3 is opened for jam removal, maintenance, etc., but when the cover 3 is closed, the drive gear 33 and the driven gear 39 mesh, and the rotation of the motor 30 is transmitted to the paper feed section 18 and paper feed roller 22. .

Example An embodiment of the present invention will be described based on the drawings.

i is a housing. This housing 1 has a box-shaped base 2 with an opening on the top and a box-shaped cover 3 with an opening on the bottom, which are rotatably connected by a support shaft 4.
and the cover 3 are removably connected by a clamp 5. The base 2 also has a drum frame 7 that rotates about a support shaft 6, is urged downward by its own weight, and is positioned by a stopper 6a.

A cylindrical photoreceptor 8 is connected to a motor (not shown) and rotatably supported on a part of the base 2, that is, the drum frame 7, and is charged along the outer periphery of the photoreceptor 8. A section 9, a toner supply section 0, a transfer section 1, a lamp L2, and a cleaning section 1:3 are attached. Furthermore, the base 2 is provided with a fixing roller 14 which is a fixing section.
, a discharge roller 15 , a suppression roller [ 6 ] pressed against the discharge roller 15 , a discharge roller 15 , and a fixing roller 1
A motor 17 that drives the paper 4 and a paper feed roller 18 that is a single paper feed unit are provided.

Further, on the back side of the upper surface of the cover 3, a light source section 19 is held that performs optical scanning by irradiating the photoreceptor 8 with a laser beam, and a four section 2I that slidably holds the paper feed cassette 20 faces the light source section 19. It is formed. A paper feed roller 22 is provided at the back of this recess 21 . Furthermore, a guide plate 23 hanging down from one end of the four parts 2 and a long guide plate 24 are formed on the - side of the cover 3, and a long guide plate 24 is formed on the base 2, and is held by the drum frame 7 and attached to the lower part of the guide plate 24. A guide plate 25 facing each other and a guide Fi 26 facing below the guide plate 25 are provided.

A paper guide 27 that guides the paper 28 is formed by these guide plates 23 to 26.

Next, on the side plate 29 behind the base 2, a motor 30, a motor gear 31 directly connected to the motor 30, and a drive gear 33 for transmitting the rotation of the motor gear 31 to a gear 32 fixed to one end of the paper feed roller 18 are provided. It is being Further, a movable body 37 is provided on the side plate 34 behind the cover 3 and is slidably held by a kite pin 35 erected from the side plate 34 and is urged downward by a spring 36. pulley 38
and a driven gear 39 are connected and held so as to rotate integrally. Furthermore, a pulley 40 connected to the paper feed roller 22 and a tension pulley 4 are mounted on the side plate 34 of the cover 3.
1, and a timing belt 42 is wound around these boots U38, 40 and a tension pulley 41.

In such a configuration, when the cover 3 is rotated downward and fixed by the clamp 5, the driven gear 39 and the drive gear 33 mesh with each other. Therefore, the paper feed roller 18 and the paper feed roller 22 that drive the motor 30 rotate. In the process of making one rotation with the photoreceptor 8, a charged layer is first formed on the outer periphery of the photoreceptor 8 by the charging section 9, and a laser beam is scanned from the light source section 19 on this charged layer to form an electrostatic latent image. Toner is supplied from the supply unit 10 to visualize the electrostatic latent image.

On the side, the paper 28 pulled out from the paper feed cassette 20 by the paper feed roller 22 is guided by the paper guide 27 and sent to the lower part of the photoreceptor 8 by the paper feed roller 18, and then transferred to the photoreceptor 8 by the transfer section 11. The 1-toner image is transferred, fixed by the fixing roller 1, and further discharged by the discharge roller 15 and the pressing roller 1G.

After the transfer, the electrostatic latent image remaining on the photoreceptor 8 is erased by the light of the lamp 12, and the remaining toner is wiped off by the cleaning section 13.

In this way, since the paper feed cassette 20 is provided on the upper surface of the cover 3, the installation area can be significantly reduced. Further, the cover 3 can be opened using the support shaft 4 as a fulcrum, and the drum frame 7 can also be opened using the support shaft 6 as a fulcrum, so that inspection and jam removal can be easily performed.

Further, when the cover 3 is rotated downward and the driven gear 39 and the drive gear 33 engage, the movable body 37 elastically moves upward, so that it is possible to absorb the shock at the time of engagement, and also to absorb the shock when the cover 3 is engaged. By increasing the tolerance around the rotating tube and making it easier to manufacture, 1□゛ can be achieved.Furthermore,
There is no need to mount a motor on the cover 3 that opens and closes to drive the paper feed roller 22, and the cover 3 can be made lighter.

Effects of the Invention Since the present invention is configured as described above, the installation space of the housing can be significantly reduced, and the motor provided on the base side allows the paper feed section provided on the base and the paper feed section provided on the cover to be This allows the cover to be lightened and opened and closed smoothly by eliminating the need for a motor to be attached to the cover.Furthermore, the cover is equipped with a movable body that is biased downward to drive this movable body. By attaching a driven gear to the body, it is possible to absorb the shock caused by the meshing of the driving gear and driven gear when the cover is lowered, and also to increase the tolerance of the opening/closing range of the cover, making manufacturing easier. It has the following effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 11.4 is a rear view showing the cover in the open state, Fig. 2 is a rear view showing the cover in the closed state, and Fig. 3 shows the cover in the closed state. FIG. 4 is a vertical front view showing the cover in an open state. 1... Housing, 2... Base, 3... Cover, 8...
・Photoreceptor, 10...toner supply section, 11...transfer section,
[-1...Fixing roller (fixing unit), 18...Paper feed roller (paper feed unit), 20...Paper feed cassette, 22...Paper feed roller, 28...Paper 530...Motor , 33・
・Drive gear, 37... Movable body, 38... Pulley, 3
9... Driven gear, 42... Belt Applicant: Tokyo Electric Co., Ltd., z'17 '''jr,'', 'jet 32 Figure 30 Figure %u Figure

Claims (1)

[Claims] 1. A housing is provided that houses at least a photoreceptor on which an electrostatic latent image is formed, a toner supply section, a transfer section, and a fixing section, and the housing is rotatable in a vertical plane relative to each other. A paper feed cassette is provided on the upper surface of the cover, and a paper feed roller is rotatably provided to draw out the sheets stacked in the paper feed cassette, and the paper feed roller is provided with a drawer. A paper feeding unit and a motor for conveying the transferred paper to the transfer unit are connected to each other and provided on the base, and a drive gear connected to the motor is provided on the base and is detachably engaged with the drive gear. A paper feeding device for an electrostatographic printer, characterized in that a driven gear is connected to the paper feeding roller and provided on the cover. 2. A housing containing at least a photoreceptor on which an electrostatic latent image is formed, a toner supply section, a transfer section, and a fixing section is provided, and this housing is connected to a base rotatably connected to each other in a vertical plane. A paper feed cassette is provided on the upper surface of the cover, and a paper feed roller is rotatably provided to draw out the sheets stacked in the paper feed cassette, and the paper drawn out to the paper feed roller is transferred to the transfer roller. A paper feeding section and a motor for conveying the paper to the section are connected to each other and provided on the base, a drive gear connected to the motor is provided on the base, and a movable body is provided on the cover so as to be slidable by urging it downward. A pulley connected to the paper feed roller by a belt and a driven gear removably engaged with the drive gear are connected to the lower part of the movable body so as to rotate integrally on the same axis. A paper feeding device for an electrostatic photographic printer characterized by the following.