JPH08259019A - Sheet material feeding device and image forming apparatus - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to prevent the sheet material from remaining in the device without providing a special sheet returning member or a sheet returning member drive means, and to ensure the continuous feeding. Provided are a sheet material feeding device capable of feeding a next sheet material while maintaining a predetermined paper distance, and an image forming apparatus adopting the sheet material feeding device. [Configuration] Separation of feeding out sheet material The input hub 65 into which the driving force of the driving means is input to the roller 60 (feeding rotating body).
1 and the input hub 651, the transmission hub 653 engaged with the input hub 651 so as to be relatively rotatable within a predetermined rotation angle range, and the transmission hub 6
A transmission spring 654 (one-way transmission means) for transmitting the driving force of the driving means to the feeding rotating body via 53, and a relationship between the input hub and the transmission hub such that the driving force of the driving means is directly transmitted from the input hub to the transmission hub. Separation roller clutch 65 (reverse force accumulation means) including a reverse rotation spring 652 (biasing means) for urging the combined state
Is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material feeding device,
The present invention relates to an image forming apparatus, and more particularly, to a feeding roller that separates and feeds sheet materials one by one.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a facsimile or a copying machine, a sheet material is used by a blocking member that is pressed against a sheet material for recording or a sheet-feeding document. Some sheets employ a sheet material feeding device that prevents double feeding.

In this type of image forming apparatus, when the sheet material stacking cassette is mounted on the apparatus main body, the blocking member moves and is pressed against the feeding member, and when it is removed, the blocking member separates from the feeding member. There is a structure in which a sheet material is prevented from remaining in the apparatus.

However, in this type of sheet material feeding device, when the blocking member is separated from the feeding member, the frictional force between the sheet material contained in the sheet material loading cassette and the sheet material conveyed to the blocking member is There is a problem that it is impossible to reliably prevent the sheet material from remaining in the device due to the shortage.

This problem has already been pointed out as a problem to be solved by, for example, Japanese Utility Model Publication 6-6117.

FIG. 12 is an explanatory view of the vicinity of a feeding rotating body showing the characteristics of the sheet feeding device of the first prior art example 6-8117 of the present invention. In order to solve this problem, feeding is performed. A rotating body 1001 and a star wheel 1002 (a star-shaped rubber sheet returning member having the same or slightly larger outer diameter as the feeding rotating body) arranged coaxially near the feeding rotating body 1001 are used. At the time of paper feeding, the feeding rotator 1001 and the star wheel 1002 are normally rotated to feed the sheet material S ′.
When the sheet material S ′ is pulled out by the downstream transport roller, the feeding rotating body 1001 is driven to rotate by the one-way bearing 1001a, and the star wheel 1001 is rotated.
Drive 2 is stopped by the action of a drive transmission clutch (not shown) and stopped. Further, when the sheet material stacking cassette 1003 is removed from the apparatus main body, a friction pad 1004 as a blocking member is separated from the feeding rotating body 1001 and then a rack 1005 arranged in the sheet material stacking cassette 1003.
And the gear 1006a on the device side mesh with each other, and the gear 1006a
The drive force transmitted from 6a through the gears 1006b and c causes the star wheel 1002 to reversely rotate in the direction of arrow A1001.
The sheet material S ′ conveyed to the friction pad 1004 is conveyed in the reverse direction into the sheet material stacking cassette 1003 to prevent the sheet material S ′ from remaining in the apparatus main body.

Further, as a second conventional example of the present invention, as shown in FIG. 13 which shows the characteristics of Japanese Patent Publication No. 51-37536, a mechanical timer is incorporated in the feeding rotary member so that the preceding paper is fed during continuous feeding. After the rear end passes through the feeding rotating body portion, the drive to the feeding rotating body is stopped for a predetermined time and the rotation of the feeding rotating body 2001 is stopped so that a predetermined space is provided between the sheets. is there.

That is, the feeding rotary body 2001 is provided coaxially and independently of the feeding rotary body 2001. A cam 2002 is rotated in the direction of arrow A2001 to rotate the feeding surface by the cam surface 2002a. The arrow A2 is caused by abutting against the turning member 2004 connected to the body 2001.
The feeding rotator 2001 is rotated in the 001 direction to convey the sheet material S ′ to the feeding roller 2005.

Since the feeding speed of the fed sheet material S'is set to be higher than the feeding speed of the feeding rotary member 2001, the cam surface 2002a and the turntable 2004 are separated during feeding, and conversely The 2002b comes into contact with the turning plate 2004. Therefore, even if the cam 2002 is rotated in the direction of arrow A2001 to feed the next sheet material, the feeding rotary body 2001 is not rotated until the cam surface 2002a comes into contact with the turning bar 2004, and The sheet material will be fed at a predetermined interval.

[0010]

However, the above-mentioned first problem
In the conventional example, the star wheel 1002 as the sheet returning member, the gear trains 1006a, b, c, and the rack 1005 are provided only to prevent the sheet material S ′ from remaining in the apparatus main body.
However, there is a problem in that it may be a complicated and expensive device.

Further, in the second conventional example, when this technique is adopted in the feeding rotating body portion to which the blocking member is pressed, which one of the feeding rotating bodies is provided while the drive to the feeding rotating body is stopped. However, there is a problem in that the behavior of the paper contained in the pressure contact portion may become unstable because the paper is also rotatable in the direction of rotation. Further, when the blocking member is separated from the feeding rotating body, the position of the feeding rotating body becomes indefinite in the operating range of the mechanical timer (between the cam surfaces 2002a and 2002b), so the blocking member is pressed against the feeding rotating body. There is a problem in that the drive transmission to the feeding rotating body may be delayed at the time of the first sheet feeding thereafter.

The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to put a sheet material into the apparatus without providing a special sheet returning member or a sheet returning member driving means. A sheet material feeding device capable of preventing the remaining material and capable of feeding the next sheet material with a predetermined distance between sheets reliably during continuous sheet feeding,
An object of the present invention is to provide an image forming apparatus that employs this sheet material feeding device.

[0013]

In order to achieve the above object, in the present invention, a feeding rotating body for feeding a sheet material, and a driving means for rotationally driving the feeding rotating body,
Blocking means for pressing the feeding rotary body into contact with each other to separate the sheet materials fed from the feeding rotary body one by one; and a sheet material transporting means for transporting the sheet material separated by the blocking means, Drive transmission control means for controlling drive transmission from the drive means to the feeding rotary body to rotate the feeding rotary body by a predetermined amount, and sheet material conveying means for conveying the sheet material fed by the feeding rotary body. When the drive transmission to the feeding rotating body is stopped by the drive transmission control means after the conveyance is started by the feeding rotating body, the feeding rotating body is driven to rotate by the sheet material being conveyed, and the feeding rotation causes the feeding operation to be performed. A reversing force accumulating means for accumulating the reversing force of the feeding rotating body, and feeding by the reversing force accumulated by the reversing force accumulating means when the pressure contact between the feeding rotating body and the blocking means is released. Rotating body reverses It is characterized in.

The reversing force accumulating means is arranged between the urging member for accumulating the reversing force and the urging member and the feeding rotating body, and transmits the driving force in the rotational direction of the feeding rotating body. It is also preferable that the unidirectional transmission means has a predetermined rotational torque in the opposite direction.

It is also preferable that the one-way transmission means is a spring clutch.

The reversing force accumulating means engages the input hub, to which the driving force of the driving means is input, and the input hub so as to be relatively rotatable within a range of a predetermined rotation angle, and the rotary feeding means. A transmission hub for transmitting a driving force to the input hub, and the biasing member biases the input hub and the transmission hub to engage with each other in a state where the driving force of the driving means is directly transmitted from the input hub to the transmission hub. It may be configured.

The reversing force by the reversing force accumulating means may be set to be smaller than the frictional force due to the pressure contact between the feeding rotating body and the blocking member.

A sheet material loading cassette that can be inserted into and removed from the apparatus main body, and a blocking means biasing means that engages the sheet material loading cassette to move the blocking means in a direction in which the blocking means is pressed against the feeding rotary member when the sheet material loading cassette is inserted. May be.

Further, the image forming apparatus may be provided with the above-mentioned sheet material feeding device and an image forming means for forming an image on the sheet material fed from the sheet material feeding device.

[0020]

In the present invention configured as described above, the sheet material is conveyed by the sheet material conveying means after being fed out by the feeding rotary member. Then, when the drive transmission to the feed rotary body is stopped by the drive transmission control means, the feed rotary body is driven to rotate by the sheet material being conveyed,
Due to this driven rotation, a reverse rotation force that reverses the feeding rotary body is accumulated in the reverse rotation force accumulation means. The accumulated reversing force reverses the feed rotating body when the pressure contact between the feed rotating body and the blocking means is released.

The one-way transmission means provided in the reversing force accumulating means transmits the rotational driving force in the feeding rotation direction input from the driving means to the feeding rotating body as it is without limiting the driving force. When the rotating body is driven to rotate by the sheet material, the reverse rotation force is transmitted to and stored in the biasing member with a predetermined rotation torque, and the transmission is stopped when a load equal to or greater than the predetermined rotation torque is applied.

Further, the spring clutch, which is a one-way transmission means, transmits the driving force of the driving means to the feeding rotating body without limiting the driving force, and conversely, the sheet material to which the driving force of the sheet material conveying means is conveyed. When the feeding rotating body is driven to rotate by way of the above, the upper limit of the driving force transmitted to the reverse rotation force accumulating means is regulated.

Due to the structure of the input hub and the transmission hub, the driving force of the driving means is opposed to the urging force of the urging member for keeping the driving force of the driving means directly transmitted from the input hub to the transmission hub as the feed rotor rotates. By rotating the input hub and the transmission hub relative to each other in the direction, the reverse rotation force for rotating the feeding rotating body in the direction opposite to the feeding direction is accumulated.

In this state, when the driving force is supplied by the driving means in order to feed the next sheet material, the input hub and the transmission hub are not engaged in the state in which the driving force of the driving means is directly transmitted. The driving force by the driving means is not transmitted to the feeding rotating body, and the sheet material is not fed out for a predetermined period. However, when the first sheet material is paid out, since the reverse rotation force is not accumulated, the input hub and the transmission hub remain engaged with each other in the payout direction so that the driving force is immediately transmitted.

Here, by setting the biasing force of the biasing member to be smaller than the holding force of the feeding rotary member of the blocking means, even if the sheet material feeding device is stopped, the blocking means feeds and rotates. As long as the body is pressed against the body, the reversing of the feeding rotating body does not occur, and the accumulated reversing force is not released.

However, the release of the accumulated reversing force occurs in the following cases.

That is, as described above, in the first case, in order to feed the next sheet material, the driving force is supplied again by the driving means, the input hub rotates in the feeding direction, and the engagement between the input hub and the transmission hub is increased. The case where the combined state is released by moving to the position where the driving force of the drive means is directly transmitted from the input hub to the transmission hub, and the second case,
This is a case where the holding force of the feeding rotating body of the blocking means becomes smaller than the reversing force stored in the urging member.

Here, the sheet material loading cassette can be inserted and removed from the main body of the apparatus, and when the sheet material loading cassette is removed from the apparatus main body, the blocking means urging means moves in the direction away from the feeding rotary body. The pressure contact force between the blocking means and the feed rotating body is reduced, the holding force is reduced, and finally the blocking means and the feed rotating body are completely separated from each other. At this time, the holding force of the feeding rotating body of the blocking means becomes smaller than the reversing force stored in the urging member. Send it out in the direction opposite to the transport direction.

【Example】

(First Embodiment) As a first embodiment, an outline of an entire facsimile apparatus equipped with a sheet material feeding device constituted by applying the present invention will be described with reference to FIGS.

FIG. 8 is an external perspective view of the facsimile apparatus. 1 is the apparatus main body, 2 is an original placing table configured so that a plurality of originals G can be stacked on the top cover of the apparatus main body 1, and 15 is an original placing table. ADF that conveys document G to the image reading unit
This is an (automatic document feeder) cover, and the read document G is discharged to the document discharge tray 8. Cassette sheet feeding unit 11, second stage cassette unit 27, or MP
The sheet material S stacked in the (multi-paper) cassette unit 13 is discharged onto the recording paper discharge tray 12 after an image is formed by the image forming unit inside the apparatus main body 1. Further, in FIG. 8, reference numeral 24 is an operation unit, 25 is a display unit, 26 is a tally lamp indicating the operating state of the facsimile apparatus, and 22 is a handset.

FIG. 9 is a cross-sectional explanatory view for explaining the internal structure of the facsimile apparatus. First, the main constituent members will be described. 3 is an image reading unit for reading the image information of the original G, and 4 is a laser beam printer. The main body of the recording apparatus, 5 is a document conveying section, 6 is a document pressing section, 7 is a contact image sensor, 9 is a laser scanner, 10 is an image forming section, 12 is a recording sheet discharge tray, and 13 is an MP (multi). (Paper) cassette portion, 14 is a cartridge cover, 16 is an upper document guide, 17 is a weight shaft, 18 is a document pressing plate, 1
Reference numeral 9 is a lower original guide, 20 is a partition between the image reading section 3 and the recording apparatus main body 4, 21 is a control section of the facsimile apparatus, and 23 is a control section.
Is a conveyance guide, 28 is a light cover, 29 is an MP (multi-paper) cassette sensor, and 30 is an MP separation unit.

The image reading unit 3 feeds and separates the originals G stacked on the original placing table 2 one by one by a pre-conveying roller 5b in pressure contact with the pre-conveying pressing piece 5a and a separating roller 5d in pressure contact with the friction piece 5c. Then, the sheet is fed to the contact image sensor 7 by the sheet feeding roller 5f which is in pressure contact with the sheet feeding roller 5e which is pressed by the pressing spring 5k, and the original pressing section 6 is used for the weight shaft 1
7. After reading the image information of the original G while pressing the original G against the contact type image sensor 7 by the original pressing plate 18 to bring the original G into close contact, the original G is pressed against the discharge roller 5g pressed by the pressing spring 5k and discharged. The document is discharged to the document discharge tray 8 by the paper roller 5h. During this time, the document G is guided by the upper document guide 16 and the lower document guide 19.

A slider 2a is slidable on the document table 2 in a direction perpendicular to the direction in which the document G is conveyed (the width direction of the document G).
Is provided so that both sides of the original document G stacked on the original document table 2 can be aligned by the slider 2a. When the original G is a long original, the extension original tray 2b can be opened to prevent the rear end of the original G from protruding from the original placing table 2 and hanging down.

The recording apparatus body 4 emits a modulation signal from the laser beam oscillator 9a of the laser scanner 9 based on the image signal output from the control section 21, and the modulated beam is exposed by the polygon mirror 9b in the image forming section 10. The body drum 10a is irradiated with the scanning light, and the photoconductor drum 10
After the image information is formed on the surface a and the image information is transferred and fixed to the sheet material S fed from the cassette paper feeding unit 11, the second stage cassette unit 27 or the MP cassette unit 13 to the image forming unit 10, The recording sheet stack tray 12 is configured to discharge the sheet.

The photosensitive drum 10a is integrally incorporated in the recording cartridge 10e together with the primary charger 10b, the developing roller 10c and the cleaning roller 10d, and is detachably attached to the apparatus main body 1. Then, the surface of the photosensitive drum 10a is uniformly charged by the primary charger 10b, and when the surface is irradiated with the scanning light reflected from the polygon mirror 9b by the folding mirror 9c, a latent image is formed.
The latent image is made visible by the toner supplied from the developing roller 10c.

A transfer charging device 10f is arranged around the photosensitive drum 10a of the image forming section 10, and the thermal fixing device 10 is provided in the recording paper conveying path downstream of the photosensitive drum 10a.
g, a discharge roller 10h is arranged.

After the toner image formed on the surface of the photosensitive drum 10a is transferred to the sheet material S by the transfer charger 10f,
The toner image is conveyed along the conveyance guide 23, the toner image is fixed by the thermal fixing device 10g, and is ejected to the recording paper ejection tray 12 by the paper ejection roller 10h.

The MP cassette section 13 is arranged at the bottom of the apparatus main body 1. MP (Multi Paper) cassette 13
The sheet material S stacked on the sheet a is transferred to the sheet M by the pressure contact member 13b.
By rotating the P (multi-paper) middle plate 13c upward, the MP (multi-paper) separation roller 30
MP (multi-paper) separation pad 30 pressed against a
MP is separated one by one by b (friction piece separation method)
(Multi-paper) Carried along the separation base 30c, further carrying rollers 28a, a cover-side U-turn guide 28b arranged on the light cover 28, and the apparatus main body 1
It is reversed by the main body side U-turn guide 28c arranged on the side.

Furthermore, the leading edge position of the sheet material S being fed is detected by the registration sensor 28d, and the photosensitive drum 10
After the paper is fed and the image output timing is adjusted so that the leading edge of the toner image formed on a and the leading edge of the sheet material S coincide with each other, the sheet is conveyed between the transfer charger 10f and the photosensitive drum 10a. The image is recorded on the lower surface side of the sheet material S stacked on the MP cassette 13a.

Further, the sheet material S has its side end face and rear end face regulated by an MP (multi-paper) regulation plate 13d mounted so as to be movable according to the size of the recording paper so that skewing and non-feeding will not occur. There is. The size and presence / absence of the sheet material S are detected by the MP cassette sensor 29. The number of stackable recording papers is about 100, and the recording papers are pulled out toward the left side of the apparatus main body 1 (side loading method). There are three types of recording paper sizes that can be stacked: A4, letter, and legal, and in FIG. 9, the MP regulation plate 13d is set to the letter size.

The cassette paper feeding unit 11 is arranged so that the top plate 11h of the cassette paper feeding unit 11 is in contact with the bottom lower surface of the apparatus main body 1, and the top surface of the top plate 11h is the bottom plate of the apparatus main body 1. There is. The sheet material S stacked on the sheet feeding cassette 11a is urged upward by an intermediate plate spring 11f, and a semicircular sheet feeding roller 11b and a pair of separating claws 11 are provided.
The sheet material S is separated one by one by the d (claw separation method), and the separated sheet material S is conveyed by the cassette conveying roller pair 11c, passes between the MP separation base 30c and the sheet passing guide 28e, and is conveyed by the conveying roller 28a. The cover side U turn guide 28b arranged on the light cover 28 and the main body side U turn guide 28c arranged on the apparatus main body 1 side are reversed. From this point, it is the same as the sheet feeding from the MP cassette unit 13 described above. The paper path joins immediately before the transport roller 28a. The image is recorded on the lower surface side of the sheet material S stacked on the paper feed cassette 11a.

Reference numeral 11m is a bottom cover of the cassette sheet feeding section 11.

Although the second-stage cassette paper feeding unit 27 is omitted in FIG. 9, it has substantially the same structure as the illustrated cassette paper-feeding unit 11, and the sheet material S inside the second-stage cassette 27a is a cassette. Paper is fed to the recording apparatus main body 4 through the lateral space portion 11g of the paper feeding portion 11.

Each of the cassettes 11a and 27a has a stackable number of recording sheets of about 500, and is configured to be pulled out in the front direction with respect to the apparatus main body 1 (front loading system). In addition, the recording paper sizes that can be stacked are A4 and Letter.

The cassette sheet feeding section 11 and the second-stage cassette sheet feeding section 27 can be separately separated and combined as an option, and the total number of recording sheets that can be stacked on the apparatus is about 1.
It is possible to change from 00 sheets to about 1100 sheets.

The apparatus body 1 is provided with a cartridge cover 14 which can be opened and closed. By opening the cartridge cover 14, the recording cartridge 10e can be opened.
It can be pulled out and replaced. Further, the cartridge cover 14 is provided with an interlock mechanism so that the recording apparatus body 4 does not operate when the cartridge cover 14 is open or the recording cartridge 10e is not set in the apparatus body 1.
Further, the drum photosensitive prevention shutter 10i provided in the recording cartridge 10e is designed to interlock with the setting of the recording cartridge 10e to the apparatus main body 1, and the cartridge cover 14 is opened to set the recording cartridge 10e to the apparatus main body 1. The shutter 10i is opened at this time, and the shutter 10i is closed when the recording cartridge 10e is taken out from the apparatus main body 1, whereby unnecessary exposure of the photosensitive drum 10a is prevented.

When a jam occurs during recording, the cartridge cover 14, the light cover 28, the paper discharge cover 1
By opening either 0j or the jam release cover 11i, the sheet material S retained inside can be taken out. Further, the paper discharge cover 10j needs to be opened after removing the recording paper discharge tray 12.

The partitioning section 20 is a duct that separates the image reading section 3 from the recording apparatus main body 4. The image reading section 3 is adversely affected by heat generated from the recording apparatus main body 4 when air is blown by a fan (not shown). It is prevented that the water vapor that has been received or evaporated from the sheet material S is condensed and drops onto the sheet material S.

The contact-type image sensor 7 uses L as a light source.
The image information surface of the document G is irradiated with light from the ED array, and the reflected light reflected by the image information surface is SELFOC lens (trademark).
To read the image information by forming an image on the sensor element.

FIG. 10 is a block diagram of a control system 300 of a facsimile apparatus adopting the laser beam type electrophotographic method according to the present invention. In the figure, reference numeral 301 denotes a CPU that controls the entire facsimile apparatus, and is used as an MPU (microprocessor unit) 301a, a ROM 301b that stores a control program for the MPU 301a, a work area for various data processing, and a temporary storage unit for image information. The RAM 301c, an image processing unit 301d that performs image scaling, resolution conversion, and the like are configured.

Further, the CPU 301 is provided with a calendar, a clock function and the like having a well-known configuration, and the area of the RAM 313 which stores important system setting information such as one-touch key destination information and software switch information is backed up by a battery to prevent a power failure or the like. Protected against accidental disability. The control system of the facsimile machine is the CPU 3 described above.
01 and the following elements 302 to 310 are connected through an interface.

The operation unit 302 includes various key switches such as a ten-key pad 314, a function key 315, a one-touch key 316, a start key 317a and a stop key 317b. The display unit 303 is an LCD 318 that displays various messages, and various LEs that display transmission modes and the like.
D319, a tally lamp 320 and the like for notifying a distant operator of the communication status and the occurrence of a failure.

The reading unit 304 is a driving unit 3 such as a reading motor.
21, a reading sensor 322 for reading an image, an image processing unit 323 for shading and binarizing the read image,
It is composed of various sensors 324 and the like for detecting a document.

The recording unit 305 is a drive unit 32 such as a recording motor.
5, a recording unit 326 that controls a laser scanner and an electrophotographic process, an image processing unit 327 that smoothes an image to be recorded, and various sensors 328 that detect recording paper and the like.

The communication control unit 306 for making and receiving calls, encoding image data, and the like has a connection unit 329 composed of MODEM, NCU, and the like, and the connection unit 329 is connected to the communication network 307 and the handset 308. The CPU external interface 309 is an interface for directly transmitting and receiving data from the CPU 301, for example, RS232C, SCS.
By connecting to a computer outside the apparatus through a line such as I or LAN, the apparatus is used as a scanner printer of the external computer. The HDD 310 is used as a large-capacity non-volatile memory for storing image information and the like.

Next, the basic operation of the image forming method will be described with reference to the conceptual diagram of FIG. In FIG. 11, reference numeral 400 is a semiconductor laser that blinks a laser beam with respect to image data to be recorded, 401 is a polygon motor, 402 is a polygon mirror rotated by the polygon motor 401, 403 is an optical system for performing image formation, tilt correction, and the like, 404. Is a photodetector, 405 is a folding mirror, 406 is a photosensitive drum, 4
07 is a developing device, S is recording paper, 409 is a conveyance guide, 41
0 is a fixing device.

In the above structure, first the semiconductor laser 4
The laser beam emitted from 00 is deflected by being reflected by the polygon mirror 402, and is irradiated onto the photosensitive drum 406 via the optical system 403 and the folding mirror 405 (main scanning). At this time, the photo detector 404 cuees to determine the irradiation position. While this main scan is completed for one line, the photosensitive drum 406 rotates for one line (sub-scan). The image formed on the photosensitive drum 406 as described above is formed by the developing device 407, and the recording sheet S
Transcribed on. Further, it is conveyed along the conveyance guide 409, fixed by the fixing device 410, and discharged.

The photosensitive drum 406 and the developing device 40 described above are used.
7, the constituent elements of the sub-scanning system such as the fixing device 410 are synchronously driven by a recording motor, a gear, a belt and the like (not shown).

Next, referring to FIGS. 1 and 2, the MP separation unit 30
1 and 2, reference numeral 60 denotes a separating roller as a feeding rotating body, 61 is an input clutch, 62 is a separating roller shaft, 63 is a bearing, 64 is a separating cam, and 65 is a separating roller. It is a separating roller clutch as a reversing force accumulating means.

The input clutch 61 is a one-way clutch unit using a spring clutch, and the input gear 61
1, clutch body 612, clutch spring 613, control ring 6
14 and the separation cam 64, the drive input to the input gear 611 is the direction in which the clutch spring 613 is tightened (forward rotation direction).
If so, the driving force is transmitted to the clutch cylinder 612, and if the clutch spring 613 is in the loosening direction (reverse direction), the driving force is not transmitted to the clutch cylinder 612, and the input gear 611 is always in the normal rotation direction. Control ring 61 rotating
The control pawl 4 is a flapper 6 of a solenoid 615 (not shown).
The driving force is transmitted or not transmitted by being fixed and released by suction of 15a and restoration by the return spring 615b.

Further, the clutch cylinder 612 and the separation cam 64
Are connected by a phase angle adjusting section 616, and a parallel pin groove 641 is formed in the separation cam 64. By inserting the parallel pin 642 here and fixing the separation cam 64, the separation cam 64 is fixed to the input gear 611. The drive input is transmitted to the separation roller shaft 62.

The separation roller shaft 62 is fixed to the apparatus via a bearing 63.

The separating roller 60 is composed of a separating roller core 601 and a separating roller rubber 602.

The separating roller clutch 65 as the reverse rotation force accumulating means is an input hub 651 and the reverse rotation spring 6 as the urging means.
52, a transmission hub 653, and a transmission spring 654 as one-way transmission means.

The input hub 651 is fixed so as not to rotate with respect to the separation roller shaft 62 by the parallel pin 656 entering the parallel pin groove 651a.

The input hub 651 and the transmission hub 653 are freely rotated by a predetermined amount, and a dog clutch shape is formed so that the rotation is restricted when the input hub 651 and the transmission hub 653 are rotated more than a predetermined amount. 45 °), and when the separation roller shaft 62 rotates in the counterclockwise direction (feeding direction) in FIG. 2, the drive transmission surfaces 651c and 651c and 6
The drive force is transmitted by the contact of 53a.

The reverse spring 652 is composed of spring tips 652a, 6a.
52b enter the reverse rotation spring fixing holes 652b and 653b, respectively, and when the separation roller clutch 65 is free, a predetermined repulsive force of the reverse rotation spring 652 (for example, 0.
The drive transmission surfaces 651c and 653a are urged by 1 N · cm) and are in contact with each other, and when the separation roller shaft 62 rotates counterclockwise from the free state, the drive transmission can be immediately performed. Further, the strength of the reverse rotation spring 652 is such that the repulsive force becomes large when the drive transmission surfaces 651c and 653a rotate mutually in the direction of separating from each other.
When the 51 and the transmission hub 653 are rotated to a position where the rotation is restricted, a predetermined repulsive force (for example, 0.5 N · cm) is generated.

Transmission cylinders 653c and 603 are formed on the transmission hub 653 and the separation roller 60, respectively, and a transmission spring 654 is wound around them. Also, the transmission barrel 653c
Is formed to be slightly thinner than the transmission cylinder 603. The transmission spring 654 functions as a spring clutch. The transmission spring 654 has a bent and raised portion 654a, and one end of the transmission spring 654 is restricted in rotation by being fitted into the bent and raised fixing groove 653d. The transmission hub 653 and the separation roller 60 are biased in opposite directions by the force.

When the transmission hub 653 is driven and rotated in the counterclockwise direction, the transmission spring 654 is closed and the drive is transmitted to function as a one-way clutch, so that the separation roller 60 rotates normally.

When the separation roller 60 is rotated in the counterclockwise direction by the rotation of the separation roller 60 driven by the conveyance of the sheet material, the transmission spring 6 is rotated.
However, as described above, one end of the transmission spring 654 on the transmission hub 653 side is restricted in rotation, and the transmission hub 653 and the separation roller 60 are prevented from rotating by a predetermined biasing force.
Since the separation roller 60 and the transmission hub 653 have a predetermined torque (for example, 1 N · cm) as a limit, a predetermined rotation torque in the counterclockwise rotation direction is transmitted to the transmission cylinder 653c. 653 rotates counterclockwise. When the transmission hub 653 rotates in the counterclockwise direction, the reversing spring 652 having a repulsive force weaker than the rotation torque is bent. At this time, the reverse rotation torque is stored in the reverse rotation spring 652.

When the transmission hub 653 further rotates in the counterclockwise direction, mutual rotation of the input hub 651 and the transmission hub 653 is restricted, so that the rotation of the transmission hub 653 stops.
The separation roller 60 is driven to rotate while applying a predetermined rotation torque to the transmission hub 653.

When the sheet material is conveyed and stopped after the driven rotation of the separation roller 60, a predetermined reverse torque for rotating the separation roller 60 in the clockwise direction (reverse rotation direction) is stored in the separation roller 60 by the reverse rotation spring 652. Has been. Here, if the separation roller 60 is set in the free state, the separation roller 60 rotates in the clockwise direction (reverse direction) by a predetermined amount by the reverse rotation torque.

In the above description, the transmission spring 654 is formed in a cylindrical shape, and the transmission cylinder 653c is formed slightly thinner than the transmission cylinder 603, so that a predetermined rotational torque in the counterclockwise rotation direction is stably transmitted to the transmission cylinder 603. However, the transmission cylinder 653c and the transmission cylinder 603 may be formed to have substantially the same thickness, and the transmission spring 654 may be formed to have an inner diameter of a truncated cone so that the transmission hub 653 side becomes thicker. The action can be achieved.

Next, the MP cassette portion 13 will be described in detail with reference to FIGS. FIG. 3 is a functional explanatory view of the MP cassette portion 13 viewed from above, and FIGS. 4 and 5 are functional explanatory views of the MP cassette portion 13 viewed from the front in the AA direction.

In FIGS. 3, 4 and 5, 31 is an MP cassette orchest, 32 is an MP existing plate, 33 is an MP intermediate plate, and 34.
Is a curl pressing claw, 35 is an auxiliary pressure spring, 37 is a lifter shaft, 38 is a lifter arm, 39 is a lifter lever, 40 is a lifter spring, 41 is a cassette guide a, 42 is a cassette guide b, 43 is a cassette side spring, and 44 and 45 are The cassette guide portion of the main body frame, 60 is a separation roller, 6
2 is a separation roller shaft, 69 is a lifter shaft bearing, and 70 is an MP
Tip protrusion of cassette, 71 is separation lever, 72 is separation spring, 73 is separation pad, 74 is claw of separation pad, and 75
Is a concave portion of the tip end projection of the MP cassette, 76 is a projection of the separation lever, 77 is a separation lever spacing regulation claw, 78 is a separation pad spacing regulation claw, and 79 is a space between the separation roller and the separation base.

An MP regulation plate 32, an MP middle plate 33 (material: polycarbonate resin), and an auxiliary pressure spring 35 (material: POM resin) are attached to the MP cassette pocket 31 (material: ABS resin). The MP regulation plate 32 is an integrally molded product of a resin mold (material: polycarbonate resin), and a curl pressing claw 34 (material: POM resin) is assembled in advance.

Here, 31a is a grip portion of the MP cassette,
Numerals 31b and 31c are curl pressing portions, 31d is a marking for explaining the operation, 31e, 31f and 31g are regulation plate fixing holes, 31h.
Is a restriction plate removal hole, 31i is a recording paper stacking surface, 31j is a restriction plate moving surface, 31n and 31p are abutting parts against the main body frame, 31q is a click part, 31r is a recording paper side end reference surface,
31s is a recording paper front end regulation surface, 32a is a front pressure spring portion, 3
Reference numeral 2b is a rear pressure spring portion, 32c is a rear end regulating portion, 32d is a regulating plate positioning pin, 33a is a middle plate hinge portion, and 33b is a middle plate pressure receiving portion.

The MP restricting plate 32 is inserted into the restricting plate removing hole 31h and moved along the restricting plate moving surface 31j, and the restricting plate positioning pin 32d is inserted and fixed in any of the restricting plate fixing holes 31e, 31f and 31g. Regulation plate fixing hole 31
e, 31f and 31g correspond to letter, A4 and legal size, respectively. Both the front side pressure spring portion 32a and the rear side pressure spring portion 32b suppress the positional deviation of the recording paper in the main scanning direction by the elasticity of the resin. The rear regulating section 32c suppresses the positional deviation of the recording paper in the sub scanning direction.

The curl pressing portions 31b and 31c are formed integrally with the MP cassette pocket 31, and suppress curling of the recording paper which occurs when the apparatus is placed in a high temperature and low humidity environment, for example. The same applies to the curl pressing claw 34. As a result, even if the recording paper curls, it will not stick out above the MP cassette orchest 31 and the recording paper will not get caught inside the device when it is mounted in the device.

The MP middle plate 33 is an integrally molded product of resin mold and is rotatably arranged around the hinge portion 33a. In the MP middle plate 33, the curl pressing portions 31b and 31c are passed through, and then the hinge portion 33a is bent inward.
In a normal use state in which the MP middle plate 33 is rotated and is fitted with a shaft provided on the side of the P cassette pocket 31, the hinge portion 33a does not bend inward and thus does not come off.

As described above, when the MP intermediate plate 33 is made of a non-conductive material, the static electricity generated by the sliding of the recording papers during continuous feeding or the like is discharged to the MP intermediate plate 33 and the operation of the apparatus is disturbed. The MP intermediate plate 33 itself does not function as an antenna because it is not stable and is a non-conductive material.

The hinge portion 33a is provided on the recording paper stacking surface 31.
It is arranged at a position higher than i, so that the position of the leading end of the MP middle plate 33 is unlikely to change in the recording paper conveyance direction (sub-scanning direction). Further, since the curl pressing portions 31b and 31c regulate the rotation of the MP middle plate 33, the MP middle plate 33 does not protrude above the MP cassette pocket 31.

FIGS. 3 and 4 show a state in which the MP cassette pocket 31 is set by the operator so that it can be fed. M
In the P cassette orchest 31, the rail portions arranged on the outer side are cassette guide portions 44 and 45 of the main body frame, and the cassette guide a 41 and the cassette guide b 4 fixed to the main body side.
It can be set smoothly by being guided by 2. When the MP cassette orchest 31 abuts the cassette guide portions 44 and 45 of the body frame by the abutting portions 31n and 31p to the body frame, the cassette side spring 43 is applied to the click portion 31q, thereby MP
A predetermined click force is applied so that the cassette orches 31 does not shift in the pull-out direction or in the direction orthogonal to the pull-out direction. The material of the cassette side spring 43 is a polyacrylate resin that does not easily cause creep deformation.

FIG. 4 shows the state in which the MP cassette 13a is mounted, and FIG. 5 shows the state in which the MP cassette 13a is removed. In all cases, the light cover 28 is closed.

The separation pad 73 incorporated in the MP separation base 30c includes the MP separation base 30c and the guide boss 73a.
Is movably supported by the separation roller 60 in the diametrical direction, and the MP separation base 3 is supported by the claw 74 of the separation pad.
It is designed so that it does not fall from 0c. The separation lever 71 is rotatably supported by the separation shaft 37. Separation pad 7
3 and the separation lever 71 are not separated from each other by a predetermined distance by engagement of the separation lever's distance regulating claw 77 and the separation pad's distance regulating claw 78. Further, a separation spring 72, which is a compression spring, is arranged between the two, and the distance between the two is kept constant by urging the two in a direction to separate them.

By mounting the MP cassette 13a, M
The tip protrusion 70 of the P cassette pushes up the separation lever 71 as a biasing member biasing member. At this time, the distance between the separation pad 73 and the separation lever 71 becomes smaller than the above-mentioned predetermined distance, so that the separation pad 7 is repulsed by the separation spring 72.
3 is a predetermined separation pressure (2 in this embodiment) on the separation roller 60.
N) is activated (FIG. 4).

At this time, the reaction force received by the tip projection 70 of the MP cassette 13a is in the direction normal to the mounting direction of the MP cassette 13a.
Does not receive a reaction force in the mounting direction, and the position is stable.

Next, when the MP cassette 13a is removed, the protrusion 76 of the separation lever, which was in the recess 75 of the protrusion of the MP cassette, is separated from the protrusion 7 of the MP cassette.
Since it is pulled out to 0 and rotates, the separation lever 71 rotates in the direction of separating the separation pad 73 from the separation roller 60. By this rotation, the distance between the separation pad 73 and the separation lever 71 moves in a direction away from the above-described fixed distance, so that the distance between the separation pad 73 and the separation lever 71 moves while maintaining the above-mentioned predetermined distance and the separation pad 73 And separation roller 60
Is released and the separation pressure is released. At this time, MP cassette 1
After the mounting of 3a, after at least one feeding, the reverse rotation torque is stored in the reverse rotation spring 652 by the driven rotation as described above, and therefore the separation roller 60 is rotated clockwise by the reverse rotation torque ( Rotate in the reverse direction) by a predetermined amount. This rotation amount is a rotation amount sufficient to push the sheet material S between the separation pad 73 and the separation roller 60 back into the MP cassette 13a during the sheet feeding. Therefore, even if the sheet material S is sandwiched between the separation pad 73 and the separation roller 60 during the sheet feeding, the separation pressure is released, and the separation roller 60
When the sheet rotates in the clockwise direction, the sheet material S is pulled out of the apparatus together with the MP cassette 13a, and no paper residue occurs (FIG. 5).

Next, referring to FIGS. 6 and 7, the MP cassette unit 1 will be described.
The operation of feeding out the sheet material S from No. 3 will be described (when the number of stacked sheet materials S is small).

First, the sheet feeding operation immediately after mounting the MP cassette 13a will be described with reference to FIG. In FIG. 6A, a lifter lever 42 and a lifter arm 38 are respectively fixed to the lifter shaft 37 so that they can rotate integrally. The lifter spring 40 has one end fixed to the hook portion of the bearing support 63 and the other end fixed to the hook portion of the lifter lever 42, and urges the lifter lever 42 toward the separation roller 60.

In the standby state, the lifter lever 42 biased by the lifter spring 40 contacts the separation cam 64 arranged coaxially with the separation roller 60 and its rotation is restricted.

When the pickup solenoid (not shown) is activated, the input clutch 61 enters the drive transmission state, and when the separation cam 64 starts rotating, the separation roller shaft 62 coupled to the separation cam 64 rotates. MP cassette 1 as described above
Since the separation roller 60 is in a free state when the separation pressure is released by pulling 3a out of the apparatus, the drive transmission surfaces 651c and 653a are in contact with each other at the time of the first sheet feeding, and the drive transmission is immediately transmitted to the separation roller 60. The separating roller 60,
The separation cam 64 starts rotating almost at the same time (FIG. 6A).

Next, when the lifter lever 42 rotates along the outer peripheral shape of the separation cam 64 and the lifter lever 42 rotates in the direction of the separation roller 60, the lifter arm 38 pushes up the MP intermediate plate 33 (FIG. 6 (b), FIG. 6C). Further, when the separation roller 60 and the separation cam 64 rotate, the sheet material S on the middle plate front end portion 67 comes into contact with the separation roller 60, and a space 68 between the separation cam and the lifter lever is generated. The sheet material S stacked on the plate 33 is pressed against the separating roller 60, and the sheet material S is pulled out by the separating roller 60 (FIGS. 6D and 6).
(E)).

When the lifter lever 42 is pushed down by the separating cam 64 by further rotating the separating roller 60 and the separating cam 64, when the lifter arm 38 rotates in the direction away from the separating roller 60, the MP intermediate plate 33 rotates by its own weight. It descends (FIG. 6 (f)).

Further, as the separation roller 60 and the separation cam 64 rotate, the MP intermediate plate 33 returns to the initial position (see FIG. 6).
(G)).

During the period from FIG. 6 (f) to FIG. 6 (g), the recording paper S
Although the pressure contact force by the MP middle plate 33 does not work on the sheet material S
Since the sheet is sandwiched between the separation roller 60 and the separation pad 73, the sheets are separated one by one by the MP separation pad 30b as described above and are conveyed along the MP separation base 30c. After the rotation of the separation roller 60 and the separation cam 64 is completed, the sheet material S is conveyed by the conveyance roller 28a, and only the separation roller 60 is driven to rotate (FIG. 6 (h)).

At this time, reverse rotation torque is stored in the reverse rotation spring 652 due to the driven rotation. When the conveyance of the sheet material S is completed, the standby state is restored (FIG. 6 (h) to FIG. 6 (a)).

In the standby state, the holding force due to the pressure contact between the separation roller 60 and the separation pad 73 is sufficiently larger than the reverse rotation torque, so that the reverse rotation torque stored in the reverse rotation spring 652 is retained as it is.

When the number of stacked sheet materials S is large, the timing at which the MP intermediate plate 33 contacts the separation roller 60 after the ascent starts, but the basic operation is the same as when the number of stacked sheets is small. Further, since the driving force is immediately transmitted to the separation roller 60 and the separation roller 60 and the separation cam 64 start rotating at substantially the same time, the sheet material S is conveyed without a time lag.

Next, a case where the second and subsequent sheets are fed without removing the MP cassette 13a will be described (FIG. 7).

When a pickup solenoid (not shown) is activated, the input clutch 61 enters a drive transmission state, and when the separation cam 64 starts to rotate, the separation roller shaft 62 coupled with the separation cam 64 rotates. However, since the drive transmission surfaces 651c and 653a are separated by the driven rotation of the previous sheet feeding, the drive transmission is not transmitted to the separation roller 60 until the separation roller shaft 62 and the separation cam 64 are rotated by a predetermined angle, and only the separation cam 68 is rotated. (FIGS. 7 (a) and 7 (b)).

Predetermined angle separation roller shaft 62, separation cam 6
4 rotates and the MP intermediate plate 33 rises, and then the separation roller 60
Is transmitted to the separation roller 60, and the separation roller 60 starts to rotate (FIG. 7C).

The subsequent operation is similar to that shown in FIG. The sheet material S stacked by the above configuration
, And whether or not the uppermost sheet material S has been conveyed to the separation pad 73 by the previous paper feeding. For this reason, it is possible to suppress the variation in the timing at which the sheet material S arrives at the transport roller 28a portion from the start of the paper feeding operation to a predetermined amount or less, so that it is possible to transport the sheet material S with the space between the sheets during continuous paper feeding. Throughput is improved.

In the operation of feeding out the sheet material S described with reference to FIGS. 6 and 7, the driving means for driving the separation roller 60 should drive the separation roller 60 until the sheet material S is conveyed to the conveyance roller 28a. Since the sheet material S is good, the drive may be stopped when the sheet material S is being conveyed to the conveying roller 28a, and the driving speed of the separating roller 60 may be slower than the conveying speed of the conveying roller 28a so that the conveying roller 28a may convey the sheet material S. It is also possible to configure the drive means to be driven after the start of the, and the well-known technique described in the conventional example can be used.

Further, in the first embodiment, the separating roller is illustrated as the feeding rotary member, but it is also within the scope of the present invention to let the separating belt come into contact with the sheet material and feed it out. It is what is done.

(Second Embodiment) Next, as a second embodiment, a configuration in which the present invention is applied to the image reading section 3 of the facsimile apparatus described in FIG. 9 will be described.

In this embodiment, the separation roller clutch described in the first embodiment is incorporated in the separation roller 5d. Although the mechanism for independently controlling the drive to the separation roller 5d is not provided, the document S is conveyed by the paper feed roller 5f by making the peripheral speed when the separation roller 5d is driven slower than the peripheral speed of the paper feed roller 5f. Sometimes the separation roller 5d is driven to rotate. As described in the first embodiment, the reverse rotation torque is stored in the separation roller clutch portion during the driven rotation.

When a plurality of originals G are conveyed while being separated, the separation roller 5d always tries to rotate in the direction opposite to the conveying direction between the originals G, so that the original G being separated becomes unstable due to vibration or the like. Since it is possible to prevent the original G from moving in the conveying direction, the separation and feeding performance of the original G is stabilized.

In the above embodiments, the image recording section is described as a laser beam type electrophotographic system, but other electrophotographic system, thermal transfer type or ink jet type sheet feeding may be used as long as cut paper is used as the sheet material. It is also applicable to devices.

Further, the separation system may be changed to another system such as a retard roller system.

The number of paper feed units, the type of recording paper to be used, and the number of stacked sheets are not particularly limited as long as they do not depart from the configuration of the present invention.

The separating roller clutch portion is made of a piano wire spring, a plastic spring or the like as the clutch spring material, and the reversing spring is a piano wire spring, a plastic spring, a sponge,
It is possible to substitute various materials such as rubber. Further, the mechanism of the clutch itself may be configured by combining a powder clutch and a needle clutch instead of the spring clutch.

[0112]

According to the present invention constructed as described above, the reversing force accumulated in the reversing force accumulating means can be transmitted to the feeding rotary member for feeding the sheet material, and the next sheet material is conveyed. It is possible to urge the sheet material in the opposite direction to prevent unnecessary protrusion of the sheet material in the conveying direction, and it is possible to reliably set the sheet material feeding interval during continuous sheet feeding, which is stable. Provided is a sheet material feeding device having high feeding efficiency capable of reliably preventing double feeding of sheet materials at such feeding timing.

Further, by using a spring clutch as the one-way transmission member, it is possible to regulate the magnitude of the reversing force that accumulates, so that the driving force from the feeding rotating body to the driving means is input in reverse. It regulates within a predetermined torque range, stabilizes the transportation of the sheet material by the transportation means, and does not apply a load to the driving means.

By making the rotational force of the reversing force stored against the urging force of the urging unit smaller than the holding force of the feeding rotating body of the blocking unit, the reversing force is released to the next sheet material. Hold until the start of feeding. At this time, since the engagement state of the input hub and the transmission hub is at a predetermined position opposite to the state where the driving force can be directly input from the driving means, the driving means is driven to feed the next sheet material. In this case, the driving force is not transmitted to the transmission hub for a certain period of time, and a constant sheet feeding interval can be set.

When the sheet material stacking cassette is loaded with the sheet material stackable and the sheet material stacking cassette is removed from the main body of the apparatus, the rotational force of the stored reversing force is greater than the holding force of the feeding rotating body of the blocking means. Since the feeding rotating body rotates in the opposite direction to the feeding direction due to the stored reversing force, the sheet rotating member does not need to have a special sheet returning member or sheet returning member driving means, so that the sheet material can be transferred into the main body of the apparatus. It becomes possible to prevent the residue.

Further, by providing the sheet material feeding device according to the present invention in the image forming apparatus, stable feeding of the sheet material is achieved, the image forming defect of the apparatus is reduced, and the sheet material loading cassette is replaced or replaced. When replenishing the sheet material, the remaining sheet material in the apparatus body is prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a separation roller unit embodying the present invention.

FIG. 2 is a detailed configuration diagram of a separation roller clutch embodying the present invention.

FIG. 3 is an explanatory view of the MP cassette section as viewed from above.

FIG. 4 is an explanatory view of the MP cassette section as viewed from the front.

FIG. 5 is an explanatory view of the MP cassette portion as viewed from the front.

FIG. 6 is a diagram illustrating an operation of a separation roller unit.

FIG. 7 is a diagram for explaining the operation of the separation roller unit.

FIG. 8 is an external view of a facsimile apparatus embodying the present invention.

FIG. 9 is an overall configuration diagram of a facsimile apparatus embodying the present invention.

FIG. 10 is a block diagram of a control system of a facsimile apparatus embodying the present invention.

FIG. 11 is a conceptual diagram illustrating a basic operation of a laser beam type electrophotographic system.

FIG. 12 is a perspective view near a separation roller of a conventional sheet material feeding device.

FIG. 13 is a structural explanatory view of a separation roller of a conventional sheet material feeding device.

[Explanation of symbols]

 1 Device Main Body 2 Original Placement Table 3 Image Reading Unit 4 Recording Device Main Body 5 Original Document Conveying Section 6 Original Pressing Section 7 Contact Image Sensor 8 Original Paper Ejection Tray 9 Laser Scanner 10 Image Forming Section 11 Cassette Paper Feeding Section 12 Recording Paper Ejection Section Tray 13 MP (multi-paper) cassette section 14 Cartridge cover 15 ADF cover 16 Upper document guide 17 Weight axis 18 Document retainer plate 19 Lower document guide 20 Image reading unit / dividing unit for recording device body 21 Facsimile device control unit 22 Handset 23 Transport Guide 24 Operation Section 25 Display Section 26 Tally Lamp 27 Second Stage Cassette Section 28 Light Cover 29 MP Cassette Sensor 30 MP Separation Section 30a Separation Roller 31 MP Cassette Rock 32 MP Restriction Plate 33 MP Middle Plate 34 Curl Press Claw 37 Lifter Axis 38 Lifter 39 Lifter lever 40 Lifter spring 41 Cassette guide a 42 Cassette guide b 43 Cassette side springs 44, 45 Cassette guide part of body frame 60 Separation roller 61 Input clutch 62 Separation roller shaft 63 Bearing 64 Separation cam 65 Separation roller clutch (reverse force accumulation) 67) Tip of middle plate 68 Space between separation cam and lifter lever 69 Bearing of lifter shaft 70 Tip protrusion of MP cassette pocket 71 Separation lever (blocking means biasing member) 72 Separation spring 73 Separation pad (blocking means) 74 Separation Pad claws 75 MP cassette orchest tip projections recesses 76 Separation lever projections 77 Separation lever spacing regulation claws 78 Separation pad spacing regulation claws 79 Space between separation roller and separation base 300 Facsimile machine control system 301 Facsimile All equipment CPU 302 Operation unit 303 Display unit 304 Reading unit 305 Recording unit 306 Communication control unit 307 Communication network 308 Handset 309 CPU external interface 310 HDD 400 Semiconductor laser 401 Polygon motor 402 Polygon mirror 403 Optical system 404 Photodetector 405 Folding mirror 406 Photosensitive Drum 407 Developing device 409 Conveying guide 410 Fixing device 651 Input hub 651c Drive transmission surface 652 Reverse rotation spring (biasing member) 653 Transmission hub 653a Drive transmission surface 654 Transmission spring (unidirectional transmission member) 656 Parallel pin

Claims (7)

[Claims] 1. A feeding rotating body for feeding a sheet material, a driving means for rotationally driving the feeding rotating body, and a sheet material fed from the feeding rotating body under pressure contact with the feeding rotating body. Blocking means for separating the sheets one by one, sheet material transporting means for transporting the sheet material separated by the blocking means, and the driving means to the feeding rotary body to rotate the feeding rotary body by a predetermined amount. Drive transmission control means for controlling the drive transmission of the sheet feeding means and the sheet material feeding means for feeding the sheet material fed by the feeding rotating body, and then the driving transmission control means transfers the sheet material to the feeding rotating body. And a reversing force accumulating means for accumulating a reversing force of the feeding rotating body by the driven rotation of the sheet material being conveyed when the drive transmission is stopped. Sending rotating body and the blocking A sheet material feeding device characterized in that when the pressure contact with the means is released, the feeding rotating body is rotated in reverse by the reversing force accumulated by the reversing force accumulating means. 2. The reversing force accumulating means is disposed between the urging member for accumulating the reversing force and the urging member and the feeding rotating body, and drives the feeding rotating body in a rotation direction. And a one-way transmission means for transmitting the torque, the one-way transmission means having a predetermined rotational torque in the opposite direction.
The sheet material feeding device described in. 3. The sheet material feeding device according to claim 2, wherein the one-way transmission means is a spring clutch. 4. The reversing force accumulating means engages the input hub, to which the driving force of the driving means is inputted, with the input hub so as to be relatively rotatable within a predetermined rotation angle range, A transmission hub for transmitting a driving force to the feeding means, and the biasing member is provided to engage the input hub and the transmission hub in a state where the driving force of the driving means is directly transmitted from the input hub to the transmission hub. The sheet material feeding device according to claim 1, wherein the sheet material feeding device is urged. 5. The reversing force by the reversing force accumulating means is set to be smaller than the frictional force due to the pressure contact between the feeding rotating body and the blocking member.
The sheet material feeding device described in. 6. A sheet material stacking cassette that can be inserted into and removed from the apparatus main body, and a blocking means biasing member that is engaged when the sheet material stacking cassette is inserted to move the blocking means in a direction in which the blocking means is pressed against the feeding rotating body. The sheet material feeding device according to claim 1, 2, 3, 4, or 5. 7. The sheet material feeding device according to claim 1, and an image is formed on the sheet material fed from the sheet material feeding device. An image forming apparatus including an image forming unit for