JPH0213404Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a paper feeding device used in electronic copying machines and the like.

(b) Prior Art In a conventional paper feeding device (for example, the paper feeding device described in Japanese Patent Publication No. 56-51977), the paper feeding path from the paper feeding roller to the register roller has a substantially linear shape.

Therefore, the distance between the two rollers becomes long, and in order to transmit rotational force between them, not only a chain but also an idler and a support member are required.
There was a dislike for the structure to become larger and more complex. In addition, in a paper feeder that has a manual paper feed section and an automatic paper feed section, a mechanism that opens each paper feed path is required to clear the paper jam when a paper jam occurs near the register roller pair. This made the structure even more complicated.

(C) Purpose of the invention The present invention has been made in view of the drawbacks of the prior art described above, and it is possible to curve the paper feed path between the paper feed roller and the register roller into a U-shape, thereby creating a space between them. It is an object of the present invention to realize a paper feeding device that shortens the distance and can easily take out jammed paper sheets when a paper jam occurs.

(d) Structure of the invention This invention consists of a manual paper feed section, an automatic paper feed section that feeds sheets stored in a paper cassette one by one, and a manual paper feed section or an automatic paper feed section. In a sheet feeding device that is equipped with a pair of register rollers that temporarily stops and then refeeds sheets fed from a section, sheets that are manually inserted into the main body of the device are placed, and a register A guide that is integrally formed with a manual feed guide that guides the paper sheets to the roller pair, and a U-shaped curved conveyance guide that reverses the paper sheets fed from the automatic paper feeder and guides them to the register roller pair. A member is provided to be swingable with one end as a fulcrum, and a display release switch for a paper jam display device is provided near the other end of the guide member, so that the guide member can be moved from the manual paper feed section and the automatic paper feed section. The paper feed device is characterized in that when the paper feed path is swung in the direction of opening the paper feed path up to the pair of register rollers, the switch is operated and the paper jam display is canceled.

(E) Embodiment FIG. 1 is a sectional view showing the internal structure of an electronic copying machine equipped with a paper feeding device according to the present invention, and FIG. 2 is a perspective view of the main parts. Reference numeral 1 denotes a copying machine main body, and a document table 2 made of a transparent glass plate is mounted on the top surface of the copying machine main body 1 so as to be slidable in the left-right direction.
A cover 3 is attached to the upper surface of the document table 2 so as to be openable and closable. During a copying operation, the document is held between the document table 2 and the cover 3 and scanned in the left and right direction. A photoreceptor drum 4 whose peripheral surface is coated with a polyvinyl carbazole photoreceptor is rotatably mounted on the copying body 1. A short focus lens array 5 is vertically disposed on the top of the photosensitive drum 4 to form an image of the document placed on the document table 2 on the circumferential surface of the photosensitive drum 4. . To the right of the short focus lens row 5 is an exposure lamp (halogen lamp) for illuminating the document surface.
6, and the short focus lens array 5 and exposure lamp 6 are fixedly mounted on the same chassis 7. 8 is a reflection plate of the exposure lamp 6. Further, on the upstream side of the short focus lens array 5, a side erase lamp 1 is provided for removing (side erase) the electric charges on the portion of the photosensitive drum 4 corresponding to the side edge of the copy paper 9.
0 is set. To perform side erasing in this way, as will be described later, use the separation claw 11 in this area.
This is to peel the copy paper 9 from the photosensitive drum 4 by contacting the photosensitive drum 4 with the photosensitive drum 4. This side erase lamp 10
A charging corotron 12 is fixedly installed on the upstream side of the photosensitive drum 4 to uniformly charge the photosensitive drum 4 positively (approximately 600 V).

A developing device 14 for developing an electrostatic latent image formed by the charging corotron 12 and the short focus lens array 5 with toner 13 is provided downstream of the short focus lens array 5. This developing device 14
has a rotatably built-in magnet roller 16 for conveying a developer 15 consisting of a mixture of toner and carrier toward the surface of the photosensitive drum 4, and a screw 17 for mixing the toner and carrier. A toner hopper 18 is detachably attached to the upper part of the developing device 14, and a sponge roller 19 is provided at the bottom of the toner hopper 18 to supply the toner 13 stored inside to the developing device 14 little by little. ing. A shutter (not shown) is provided at the bottom of the toner hopper 18 to prevent the toner 13 from leaking when the toner hopper 18 is transported, and the toner hopper 18 is attached to the developing device 14. As a result, the shutter is configured to open automatically. Reference numeral 20 denotes a counter that operates each time the toner hopper 18 is replaced, and counts the number of times the toner hopper 18 is replaced. For example, when the count value of the counter 20 reaches "5", a display is displayed on the copying machine main body 1 indicating that the photosensitive drum 4 should be replaced. In addition, the counter 2
A mechanism (not shown) is provided that prevents the toner hopper 18 from being replaced for the sixth time when the count value of 0 reaches a certain value, which in the above example reaches "5". A magnet 21 is fixedly installed at the downstream edge of the developing device 14 to capture the carrier that has escaped.

Reference numeral 22 denotes a manual paper feed tray provided in the copying machine main body 1, and a start switch 23, which also serves as a jam sensor, is provided on the downstream side of this paper feed tray 22.

Reference numeral 24 denotes a paper feed cassette that is detachably attached to the inner bottom of the copying machine main body 1. This paper feed cassette 24 is installed from the right side to the left side of the copying machine main body 1. A support plate 25 on which the copy paper 9 is placed is swingably provided at the inner bottom of the paper feed cassette 24. At the bottom of the support plate 25, the base end is connected to the main body of the copying machine. 1 is provided with an opening 24a through which the free end of the push-up lever 26, which is swingably mounted on the inner bottom of the push-up lever 26, can be inserted. A torsion spring 27 is attached to the push-up lever 26 to urge it to rotate clockwise, and the support plate 25
is urged upward by this torsion spring 27. Further, above near the downstream end of the paper feed cassette 24, there is provided a paper feed roller 28 that feeds the copy paper 9 one sheet at a time. It's pressing.
Therefore, the copy paper 9 is held by the weight of the paper feed roller 28 and the torsion spring 27 attached to the push-up lever 26. 29
is a corner separator that separates copy paper 9 one by one.

A guide 30 is provided on the downstream side of the paper feed cassette 24 for causing the copy paper 9 fed by the paper feed roller 28 to make an upward U-turn.
The guide 30 is integrally formed with the paper feed table 22, and is configured to be able to rotate counterclockwise as shown in FIG. 2, using a support shaft 31 inserted through the lower end as a fulcrum.

A pair of magnets 56, 56 for magnetically attaching the paper feed table 22 is fixed to a chassis 57 made of a magnetic member at the left end of the paper feed table 22. And, on the top of this one magnet 56,
A protrusion 58 is formed that protrudes in the direction in which the guide 22 is closed, and when the guide 30 is closed, the protrusion 58
The actuator 60 of the micro switch 59 fixed on the chassis 57 is pressed. The micro switch 59 is a display release switch for a paper jam display device (not shown), and when a paper jam occurs, the actuator 60 is activated by rotating the guide 30 counterclockwise.
is released and the paper jam display is automatically cleared. Therefore, after removing the jammed copy paper,
There is no need for the operator to press a reset button.

On the downstream side of the guide 30, there is a paper feed cassette 2.
A pair of register rollers 32 and 33 for once stopping the copy paper 9 fed from the document tray 22 and the document tray 22, and then feeding it again in synchronization with the operation of the document tray 2.
is provided. This register roller pair 32,
Among the rollers 33, the lower roller 33 is connected to a drive source, and this lower roller 33 continuously rotates. The lower roller 33 and paper feed roller 28 are connected via pulleys 34, 35 and a belt 36. Note that the paper feed roller 28 and pulley 35
It is assumed that a clutch is interposed between the two. The upper roller 32 of the pair of register rollers 32 and 33 is connected to a lever 3 fixedly attached to a holding shaft 37 rotatably provided in the copying machine main body 1.
It is rotatably attached to one end of 8. The other end of the lever 38 is bent into an L-shape and is formed so as to be able to stop the downstream edge of the copy paper 9 fed from the paper feed cassette 24 or the paper feed table 22. The left and right moments of the lever 38 are balanced around the holding shaft 37, and the pair of register rollers 32 and 33 are not pressed against each other until the copy paper 9 arrives. Therefore, even if the lower roller 33 is continuously rotating, the upper roller 32 is not urged to rotate, and even if the copy paper 9 just arrives between the register roller pair 32, 33, it cannot be fed by these. Not done. However, when the downstream edge of the copy paper 9 that has been manually fed or fed to the paper feed roller 28 is stopped by the L-shaped portion of the lever 38, the lever 38 is attached to the holding shaft 37. A moment is applied in a counterclockwise direction around It does not provide enough feeding force to pass through. Therefore, the copy paper 9 continues to stop with its downstream edge in contact with the L-shaped portion of the lever 38, but when the timing with the operation of the document table 2 is determined, the copy paper 9 is attached to the lever 38. A further counterclockwise moment is applied to this lever 38 by a plunger (not shown). Then, the copy paper 9 is sufficiently held between the pair of register rollers 32 and 33, and a feeding force sufficient to pass through the L-shaped portion of the lever 38 is applied, so that the copy paper 9 is directed toward the photoreceptor drum 4. be sent.

A transfer corotron 39 is provided at the lower end of the photosensitive drum 4 for transferring the toner image developed by the developing device 14 onto copy paper 9. Further, on the downstream side of the transfer corotron 39, the separating claw 11 for separating the copy paper 9 from the photosensitive drum 4 is arranged adjacent to the separation claw 11. This separation claw 1
1 is rotatably mounted on the support shaft 42 of the upper roller 40 of the pair of conveyance rollers 40 and 41, and is biased to rotate toward the surface of the photosensitive drum 4 by a spring (not shown). ing.

On the downstream side of the conveyance rollers 40 and 41, there is a fixing device composed of a heat roller 43 into which a halogen lamp of about 800 W is inserted, and a pressure roller 44 that is pressed against the heat roller 43. 45 are provided. An oil supply pipe 4 is provided above the heat roller 43 for supplying silicone oil to the heat roller 43.
6 is lightly pressed. Fine open cells are formed on the wall of the oil supply pipe 46, and the inside thereof is filled with silicone oil. Therefore, the silicone oil in this oil supply pipe 46 is
The heat roller 4 penetrates the pipe wall of this pipe 46 and
3. Further, on the left side of the pressure roller 44, this roller 44 is rotated counterclockwise.
That is, a torsion spring 47 is provided to press against the heat roller 43. 48 is a triangular blade for separating the copy paper 9 from the heat roller 43.

The copy paper 9 on which the toner image has been fixed by the fixing device 45 is then discharged onto a paper discharge tray 48 provided above the paper feed cassette 24. Note that this paper discharge tray 48 is configured to be able to move in and out of the copying machine main body 1, and is inserted into the copying machine main body 1 when not needed.

A cleaning device is provided on the downstream side (upper side in the figure) of the separating claw 11 along the rotational direction of the photosensitive drum 4 for removing toner that has not been completely transferred to the copy paper 9 and remains on the photosensitive drum 4. 49 are provided. The cleaning device 49 includes a rubber blade 50 for scraping off residual toner on the photosensitive drum 4, and a screw conveyor 51 for discharging the toner scraped off by the blade 50. . The blade 50 also has a spring (not shown) that biases the blade 50 in a counterclockwise direction, that is, biases the leading edge toward the photosensitive drum 4.
is provided. An eraser lamp 52 for removing all residual charges on the photoreceptor drum 4 is provided downstream of the cleaning device 49 (upward in the figure). 53 is a filter of this eraser lamp 52.

Further, on the right side of the copying machine main body 1, that is, on the side where the paper ejection tray 48 and the paper feed cassette 24 are attached, there is a handle 5 for lifting the copying machine main body 1.
4 is fixed.

Furthermore, a prismatic rubber cushion 55 is fixedly provided on the side surface (left side surface) of the copying machine main body 1 opposite to the side surface on which the handle 54 is fixedly provided. The rubber cushion 55 serves to protect the copying machine main body 1 when the copying machine main body 1 is placed on the ground or the like in a lifted position.

After placing the original on the original platen 2,
When a copy start switch (not shown) is turned on, the document table 2 moves forward to the left and then back to the right. During this backward movement, the document image is placed on the photoreceptor drum 4. The projected image is formed on the photosensitive drum 4 to form an electrostatic latent image corresponding to the original image. This electrostatic latent image is then transferred to the developing device 14.
The toner image is then transferred to the copy paper 9 fed from the paper feed cassette 24 by the transfer corotron 39. In this way, the copy paper 9 with the toner image transferred thereto is separated by the separation claw 1.
1, it is peeled off from the photoreceptor drum 4, and is heated and pressed by a fixing device 45 to be fixed. and,
The fixed copy paper 9 is placed on the paper discharge tray 48.

Note that residual charges and toner that has not been completely transferred to the copy paper 9 and remains on the photosensitive drum 4 are removed by the cleaning device 49 and the eraser lamp 52.
It will be removed.

(F) Effects of the invention In this invention, the paper feed path from the register roller to the paper feed roller is curved in a U-shape, so the distance between both rollers is shorter than that of conventional devices. is shortened. Therefore, an idler as a means for transmitting rotational force between both rollers is unnecessary, and the structure can be made smaller and simpler.

In addition, there is a manual feed guide that places paper sheets to be manually inserted into the apparatus main body and guides them to a pair of register rollers, and a manual feed guide that inverts paper sheets fed from the automatic paper feed section and guides them to a pair of register rollers. U
The guide member, which is integrally formed with the conveyance guide which is curved in the shape of a letter, is mounted so as to be able to swing freely with one end as a fulcrum. Even if a paper jam occurs in any of the paper feed paths, the jammed paper sheet can be easily removed by simply swinging the guide member. In addition, there is no need to provide a paper jam removal mechanism for each paper feed path, which simplifies the configuration, allowing for a reduction in the number of parts and miniaturization.

Further, the guide member is provided with a switch for canceling the display of the paper jam display device, and when the guide member swings in the direction of opening the paper feed path, the switch is operated to automatically cancel the paper jam display. Therefore, there is no need for the operator to press the reset button each time.

[Brief explanation of the drawing]

Each of the drawings shows an embodiment of the present invention.
The figure is a sectional view, and FIG. 2 is a perspective view of the main part. 1... Copying machine main body, 28... Paper feed roller, 3
2, 33...Register roller, 56...Magnet, 5
7... Chassis, 58... Protrusion, 59... Micro switch (display cancellation switch).

Claims (1)

[Scope of Utility Model Registration Claim] A manual paper feed section, an automatic paper feed section that feeds sheets stored in a paper cassette one by one, and a manual paper feed section or an automatic paper feed section. In a paper feeding device that is equipped with a pair of register rollers that temporarily stops fed paper sheets and then refeeds them, the paper sheet that is manually inserted into the main body of the device is placed, and the pair of register rollers A guide member is integrally formed with a manual feed guide that guides the paper sheets fed from the automatic paper feed section and a U-shaped curved conveyance guide that reverses the paper sheets fed from the automatic paper feed section and guides them to the pair of register rollers. , is provided to be swingable with one end as a fulcrum, and a display release switch for a paper jam display device is provided near the other end of the guide member, so that the guide member can move from the manual paper feed section and the automatic paper feed section to the registration roller. A paper feed device characterized in that when the paper feed path is swung in a direction to open a paper feed path up to the pair, the switch is operated and the paper jam display is canceled.