JPH10194501A - Sheet feeding device, and image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an actuator to operate a conventional stopper device, and to simplify the constitution of devices by moving a stopper member to the regulating position or the evacuating position relative to a sheet by turning a cam member according to the turning direction and the turning quantity of a drive source. SOLUTION: A locking part 21b of a stopper member 21 is at the regulating position projected upward of a guide surface from a hole 2a of a lower carrying guide 2, and in a condition where the tip of a set original is regulated. In this condition, when reading of the image of the original is started, a motor is turned in the forward direction by the prescribed quantity by the pulse control, a cam member 23 is turned clockwise through a spring clutch 25, and the locking part 21b of the stopper member 21 is lowered. When a projected part 25a of the spring clutch 25 is at the position where the projected part 25a is abutted on an abutting part 26, the stopper member 21 is at the lowest position which is the evacuating position, and the original can be fed, and the original is carried by a carrying means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus which regulates the leading edge of a sheet placed on a placing portion and can release the regulation at a desired timing, for example, a facsimile, a copying machine, a scanner, and the like. The present invention relates to a sheet supply apparatus for supplying sheets such as a document and a recording sheet one by one to a predetermined image processing position in an image processing apparatus such as a printer.

[0002]

2. Description of the Related Art Conventionally, in an image processing apparatus such as a facsimile, for example, a sheet feeding apparatus for feeding a document as a sheet to a reading position is used to regulate the leading end of a document bundle placed on a placing section. Are provided.
The stopper is provided between a pickup roller that picks up and conveys the original placed on the mounting portion and a separation conveyance roller that separates and conveys the originals picked up and conveyed by the pickup roller one by one. When the set of originals is set, the leading end of the original set is prevented from being pushed into the separation / conveying roller at a stretch when the pickup roller is stopped.

When the supply of the document is started, the regulation of the document bundle is released by retracting the stopper, and the document is supplied one by one by a pickup roller and a separation conveyance roller. The image of the supplied document is read by the reading unit at the reading position.

Accordingly, the conventional stopper can be moved between a regulating position for regulating the leading end of the document bundle and a retracting position for enabling the supply of the document bundle. The operation of the stopper is controlled by a solenoid or the like. The configuration is performed by an actuator.

[0005]

However, in the above-mentioned conventional apparatus, since an actuator such as a solenoid is used to operate the stopper, a control unit for controlling the actuator is also required.
There has been a problem that the configuration of the apparatus is complicated and the cost is high.

An object of the present invention is to provide a sheet feeding apparatus which can operate a stopper with a low-cost and simple structure.

[0007]

In order to achieve the above object, a typical configuration of the present invention is a mounting means capable of mounting a plurality of sheets and a mounting means mounted on the mounting means. A stopper device for regulating the leading edge of the sheet to be released and releasing the regulation at a desired timing; and a conveying means for conveying, one by one, the sheets for which the restriction by the stopper device has been released. The apparatus is provided with a stopper member movable between a regulating position for regulating the leading edge of the sheet and a retreat position for releasing the regulation, a cam member for switching the position of the stopper member, and a device provided between the cam member and the driving source. And a idler for causing the spring clutch to idle. The cam member is rotated by a predetermined amount in one direction via the spring clutch by the driving source to retract the stopper member. After the movement, the idling means sets the spring clutch in an idling state and stops the rotation of the cam member, while driving the conveying means by the drive source to convey the sheet. The stopper member is moved to the regulating position by rotating a predetermined amount in the other direction, and the driving source is a motor for rotationally driving the conveying unit, and the conveying unit is rotated in the sheet conveying direction. The one-way rotation of the cam member is performed by the forward rotation of the driving motor, and the other direction rotation of the cam member is performed by the reverse rotation of the motor.

According to the above construction, the stopper member can be moved to the regulating position or the retracted position with respect to the sheet by rotating the cam member in accordance with the rotation direction and the amount of rotation of the driving source. An actuator such as a solenoid for operating the device is not required, so that the configuration of the device is simplified and the manufacturing cost is reduced. Further, since the control of the motor for rotating the cam member is only required to slightly change the program of the control device originally provided for sheet conveyance, it is not necessary to separately provide a control device necessary for the actuator. Further, the configuration of the apparatus is simplified, and the manufacturing cost is reduced.

[0009]

Next, an embodiment of a sheet feeding apparatus to which the present invention is applied will be specifically described with reference to the drawings. In the following description, a facsimile apparatus will be exemplified as an image processing apparatus, and an example in which the present invention is applied to a sheet feeding apparatus which supplies originals as sheets in the facsimile apparatus one by one will be described.

FIG. 1 is a side sectional view of a sheet feeding device according to the present invention, FIG. 2 is a top view of the sheet feeding device, FIG. 3 is an explanatory view of the operation of a stopper device in the sheet feeding device, and FIG. 5 is a detailed perspective view of a cam shaft, a cam member, and a spring clutch constituting the image processing apparatus. FIG. 5 is an external perspective view of an image processing apparatus provided with a sheet supply device according to the present invention. FIG. FIG. 7 is a front sectional view of the image processing apparatus, and FIG. 7 is a side sectional view of the image processing apparatus provided with the sheet feeding device according to the present invention.

First, the overall configuration of a facsimile apparatus as an image processing apparatus will be schematically described with reference to FIGS.

5 to 7, reference numeral 50 denotes an apparatus main body; 51, a recording unit composed of a laser beam printer; 52, a laser scanner; 53, an image forming unit; 54A, 54B cassette feed units; Paper tray, 56 is MP (multi-recording paper)
Cassette unit, 57 is an MP separation unit, 58 is a recording paper conveyance guide, 59 is a light cover for clearing recording paper jam, 60 is a facsimile machine control unit, 61 is a cartridge cover,
62 is an ADF (automatic document feeder) cover, 63 is a partition between the document reading unit 68 and the recording unit 51, 64 is a handset, 65 is an operation unit, 66 is a display unit, and 67 is a tally lamp indicating the operation state of the facsimile machine. It is.

An original reading section 68 for reading an image while conveying an original D as a sheet is provided above the facsimile apparatus. In the document reading section 68, the present invention is applied to a transport section that transports a document D as a sheet. The document reading section 68 will be described later in detail.

The recording section 51 emits a modulation signal from a laser beam oscillator 52a of a laser scanner 52 based on the image signal output from the control section 60, and outputs this modulation beam to the photosensitive member of the image forming section 53 by a polygon mirror 52b. Drum 53
is irradiated with scanning light to form image information on the surface of the photosensitive drum 53a, and the image information is recorded on the recording paper P fed to the image forming unit 53 from the cassette sheet feeding units 54A and 54B or the MP cassette unit 56. After the image is transferred and fixed by the thermal fixing unit 53g, the sheet is discharged to the recording sheet stacking tray 55.

The photosensitive drum 53a is integrally incorporated in a process cartridge 53e together with a primary charger 53b, a developing roller 53c and a cleaning roller 53d.
It is configured to be detachable from 50. Then, the surface of the photosensitive drum 53a is uniformly charged by the primary charger 53b, and when the scanning light is reflected from the polygon mirror 52b by the return mirror 52c and irradiated on the surface, a latent image is formed. The image is visualized by the toner supplied from 53c.

A transfer charger 53f is arranged around the photosensitive drum 53a of the image forming unit 53, and a thermal fixing unit 53g and a discharge roller 53h are arranged on a recording paper transport path downstream of the photosensitive drum 53a. Have been.

After the toner image formed on the surface of the photosensitive drum 53a is transferred by the transfer charger 53f, the recording paper P is conveyed along a conveyance guide 58, and the toner image is fixed by the heat fixing device 53g. And the recording paper discharge tray 55 by the discharge rollers 53h.
It is designed to be discharged upward.

The MP cassette section 56 is provided at the bottom of the apparatus main body 50. Recording paper P loaded on MP cassette 56a
Is pressed against the MP separation roller 57a by rotating the MP middle plate 56c upward by the pressing member 56b,
After being separated one by one by the P separation pad 57b (friction piece separation method), and conveyed along the MP separation base 57c, the conveyance roller 59a and the cover-side U-turn guide 59b disposed on the light cover 59 are further separated. Is inverted by the main body side U-turn guide 59c disposed on the apparatus main body 50 side.
Further, the leading end position of the recording paper P being fed is detected by the registration sensor 59d, and the recording paper P is fed and the image output timing is adjusted so that the leading end of the toner image formed on the photosensitive drum 53a and the leading end of the recording paper P coincide. Then, the sheet is conveyed between the transfer charger 53f and the photosensitive drum 53a. The image is MP cassette
Recording is performed on the lower surface side of the recording paper P stacked on 56a.

Further, the recording paper P is moved by an MP regulating plate 56d movably mounted in accordance with the size of the recording paper, thereby forming a side end face,
The rear end face is regulated so that skewing and non-feeding do not occur. The size and presence or absence of the recording paper P are detected by the MP cassette sensor 56f. In this embodiment,
The number of sheets that can be stacked on the MP cassette section 56 is 100, and the MP cassette section 56 is configured to be drawn out to the left side toward the apparatus main body 50 (side loading method). In addition, there are three types of recording paper sizes that can be stacked: A4, letter (LTR), and legal (LGL). In FIG.
d is set to A4 size.

The cassette paper feeding section 54A is disposed such that the top plate 54h of the cassette paper feeding section 54A is in contact with the bottom lower surface of the apparatus main body 50, and the upper surface of the top plate 54h is the bottom plate of the apparatus main body 50. I have. The recording sheet P stacked on the sheet feeding cassette 54a is urged upward by the middle plate 54b by the middle plate spring 54c, sent out by the semicircular sheet feeding roller 54d, and separated one by one by separation means. This separating means is provided downstream of the paper feed roller 54d, and includes a feed roller 54e as a feeding rotating body and a retard roller 54f as a frictional separating body provided to be able to contact and separate from the feed roller 54e. It is composed of The feed roller 54e rotates in a direction to feed the recording paper P, and the retard roller 54f rotates in a direction to return the recording paper P to the cassette 54a side, and the recording paper is moved between the feed roller 54e and the retard roller 54f. P
Are separated one by one. The cassette 54a is provided with a separation claw 54g as a preliminary separation of the recording paper P. Thereby, the recording paper P is surely separated one by one. The separated recording paper P passes between the MP separation base 57c and the paper passing guide 59e, and is conveyed to the transport roller 59a and the light cover.
The cover is turned upside down by a cover-side U-turn guide 59b arranged at 59 and a body-side U-turn guide 59c arranged at the apparatus body 50 side. From here on, it is the same as the sheet feeding from the MP cassette unit 56 described above. The recording paper conveyance path joins immediately before the conveyance roller 59a. Since the recording paper is inverted in this manner, an image is recorded on the lower surface side of the recording paper P stacked on the paper supply cassette 54a.

Although the cassette paper feeding section 54B is omitted in FIG. 7, it has substantially the same configuration as the cassette paper feeding section 54A, and the recording paper P inside the cassette stores the side space 54i of the cassette paper feeding section 54A. Is fed to the recording unit 51 through the

In this embodiment, the cassette sheet feeding section 54
For both A and 54B paper cassettes, the number of recordable paper sheets
The number of sheets is 500, and it is configured to be pulled out to the front of the apparatus main body 50 (front loading method).
The stackable recording paper sizes are mainly two types, A4 and letter (LTR).

The cassette paper feeding units 54A and 54B can be separated and joined as options, and the total number of sheets that can be loaded on the entire apparatus is 100 (the cassette paper feeding unit 54B).
A, 54B) to 1100 sheets (cassette feeder
54A and 54B).

The apparatus main body 50 is provided with a cartridge cover 61 which can be opened and closed. When the cartridge cover 61 is opened, the process cartridge 53e is attached to the apparatus main body 50.
It can be pulled out and replaced. Also,
The cartridge cover 61 is provided with an interlock mechanism. When the cartridge cover 61 is open or the process cartridge 53e is not set in the apparatus main body 50, the recording unit 51 does not operate. Also,
The drum exposure prevention shutter 53i provided on the process cartridge 53e is linked to the setting of the process cartridge 53e in the apparatus main body 50. When the cartridge cover 61 is opened, the process cartridge 53e is moved to the apparatus main body 50.
When the process cartridge 53e is taken out of the apparatus main body 50, the shutter 53i is opened.
By closing i, unnecessary exposure of the photosensitive drum 53a is prevented.

If a jam occurs during recording, the cartridge cover 61, the light cover 59, the paper discharge cover 53
j, by opening any of the jam release covers 54j, the recording paper S staying inside can be taken out. Note that the paper discharge cover 53j needs to be opened after the recording paper discharge tray 55 is removed.

The partitioning section 63 is a duct for separating the document reading section 68 and the recording section 51. The air generated by the fan by means of a fan (not shown) causes the document reading section 68 to adversely affect the heat generated by the recording section 51. This prevents water vapor evaporating from the recording paper P from condensing and dropping on the recording paper P.

Next, the original reading section 68 to which the present invention is applied will be described in detail with reference to FIGS.

1 to 4, reference numeral 1 denotes an upper document guide;
Reference numeral 2 denotes a lower document guide, which forms a document conveyance path in the document reading section 68. At the most upstream side of this document transport path,
An original mounting table 31 is provided as mounting means. As shown in FIG. 7, the original mounting table 31 is provided with a slider 31a slidable in a width direction orthogonal to the direction in which the original D is transported.
Both sides of the original D stacked thereon can be aligned. In addition, when the document D is a long document, by opening the extension document tray 31b, it is possible to prevent the rear end of the document D from protruding from the document table 31 and hanging down.

In FIGS. 1 to 4, reference numerals 3 and 4 denote preliminary transport rollers and preliminary transport pressing pieces as preliminary transport means.
The preliminary transport roller 3 is a partially cut-out roller having a half-moon shape or the like that transports the original from the lower original guide 2 and transports the original downstream. The preliminary transport pressing piece 4 rides on the original and presses the original against the preliminary transport roller 3. 5,6
Reference numeral denotes a separation roller serving as separation / conveyance means, which separates the originals one by one when the originals fed by the preliminary conveyance means are multi-fed. Reference numerals 7 and 8 denote conveying rollers for conveying the document sent from the separation rollers 5 and 6 to a reading position on the downstream side. The rollers 6 and 8 are rotatably mounted on a lever 9 and have a spring
The rollers 10 are urged toward the rollers 5 and 7 respectively. 11
Reference numeral denotes a contact type image sensor as a reading unit, which reads information on a document sent to a reading position. This contact type image sensor 11 has an LE as a light source.
The image information is read by irradiating the image information surface of the document from the D array with light and forming an image of the reflected light reflected from the image information surface on the sensor element by a selfoc lens. Reference numeral 12 denotes a document pressing portion, which presses the document against the contact image sensor 11 by the weight shaft 12a and the document pressing plate 12b to bring the document into close contact. Reference numerals 13 and 14 denote paper discharge rollers for carrying out the document on which the image has been read onto the paper discharge tray 32.

Reference numeral 15 denotes a drive shaft, which is connected to a motor (preferably a pulse motor) as a drive source (not shown).
Therefore, the driving force of the motor is transmitted from the drive shaft 15 to the gear train G.
1 to the spring clutch 16. The spring clutch 16 is provided with a control ring 16a.
The locking claw member 18 is engaged with the locking portion 16b of FIG. By operating the locking claw member 18 by the solenoid 17, the preliminary transport roller 3 makes one rotation in the transport direction. That is, since the preliminary transport roller 3 is controlled to rotate once by the above-described mechanism, the vertical mechanism for contacting / separating the preliminary transport roller 3 from / to the document, which is conventionally required, is not required. Therefore, the preliminary transport roller 3 always stops at the D-cut position shown in FIG. 1 after the preliminary transport (one rotation), so that the original is not caught at the time of setting.

The separation rollers 5 and 6 and the preliminary conveyance roller 3
A stopper device 20 that regulates the leading edge of the document set on the document table 31 and releases the regulation at a desired timing is disposed between the stopper device 20 and the stopper device 20. This stopper device 20
Is a regulation position for regulating the leading edge of the document (see FIG. 3A)
And a retracting position (see FIG. 3C) for releasing the regulation, a cam member 23 for switching the position of the stopper member 21, and a cam member 23 and a motor (not shown). It comprises a spring clutch 25 provided therebetween, and a protruding portion 25a and an abutting portion 26 as idling means for bringing the spring clutch 25 into an idling state.

The stopper member 21 has a locking portion 21b for locking the leading end of a document at one end of a main body 21a, and the other end is rotatably supported by the apparatus main body by a pivot 22. The stopper 21b of the stopper member 21 can project / retreat on the lower document guide 2 through a hole 2a provided in the lower document guide 2. The cam member 23 is a gear train G2,
It is connected to the drive shaft 15 via a cam shaft 24 and a spring clutch 25. A protruding portion 25a is provided at one end of the spring clutch 25. When the camshaft 24 rotates clockwise in FIG. Put the clutch 25 in the idling state. That is, the transmission of the driving force from the motor to the cam member is cut off. Also, the other end of the spring clutch 25 has a protrusion 25.
The protrusion 25b is engaged with the engaging portion 23a of the cam member 23. Therefore, the spring clutch 25
And the cam member 23 rotate integrally.

The cam member is connected via the spring clutch 25.
The motor that rotationally drives the roller 23 is a motor that rotationally drives each of the rollers that constitute the transport unit. As will be described later, the motor is configured to rotate the cam member 23 in one direction by normal rotation of a motor that drives the roller to rotate in the sheet conveyance direction, and to rotate the cam member 23 in the other direction by reverse rotation of the motor. ing.

Next, the operation of the original reading section 68 including the operation of the stopper device 20 will be described. In FIG. 3A, the locking portion 21b of the stopper member 21 is at a regulating position protruding above the guide surface from the hole 2a of the lower transport guide 2, and regulates the leading end of a set document (not shown). It is in.

When the image reading of the document is started, first, the motor is rotated in the forward direction (hereinafter referred to as forward rotation). Here, the forward rotation of the motor means a rotation direction in which each roller is rotated in the sheet conveyance direction. When the motor rotates in this manner, the cam member 23 rotates clockwise in FIG. 3 via the spring clutch 25, and the stopper member 21 rotates counterclockwise in FIG.
Is lowered (see FIG. 3B).

Further, the cam member 23 rotates clockwise in FIG. 3, and the projecting portion 25a of the spring clutch 25
When the stopper member 21 reaches the position where the stopper member 21 comes into contact with the stopper member 26 (see FIG. 3C), the stopper member 21 is at the lowest position, which is the retracted position, and the document can be supplied.

The state shown in FIG. 3A is used as a reference until the state shown in FIG. 3C, that is, the protruding portion 25a of the spring clutch 25.
Until the stopper abuts on the abutting portion 26 and the stopper member 21 is completely lowered, the motor is rotated forward by a fixed amount by pulse control. The amount of forward rotation of the motor varies depending on the shape of the cam member 23, but in this embodiment, pulse control is performed so that the motor rotates forward by about 110 °.

Next, when the motor is rotated forward to rotate the rollers constituting the transporting means, the spring clutch 25 becomes idle, and this state is continued until the transport of the document is completed (FIG. 3C). reference). Therefore, the stopper member 21
Are retracted to the retracted position and the cam member 23 is stopped at the predetermined position, and each roller rotates in the transport direction to transport the document.

That is, the original placed on the original placing table 31 is firstly moved to the preliminary conveying roller 3 pressed against the preliminary conveying pressing piece 4.
The sheet is separated and fed one by one by the separation roller 5 pressed against the reverse rotation roller 6, and further conveyed to the close contact type image sensor 11 by the conveyance roller 7 pressed against the conveyance roller 8 pressed by the pressing spring 10. At the reading position, the original is brought into close contact with the contact image sensor 11 by the weight shaft 12a and the original pressing plate 12b at the original pressing portion 12,
The image information is read. The document from which the image has been read is discharged to a document discharge tray 32 by a discharge roller 13 pressed against a discharge roller 14 pressed by a pressing spring (not shown). During this time, the original is guided by the upper original guide 1 and the lower original guide 2. Also contact image sensor
The image information of the document read by 11 is sent to the above-described image forming unit or another device, and is recorded and formed on a recording sheet based on the information.

When the discharge of the last document by the paper discharge rollers 13 and 14 is detected by a detecting means (not shown), the motor is rotated in reverse (see FIG. 3D), and the cam member 23 is moved to the position shown in FIG. It is reversed until it returns to the state shown in a). The amount of reverse rotation of this motor is the same as the amount of forward rotation described above, and is about 110 ° in the present embodiment. At this time, the cam member 23 and the spring clutch 28 rotate in the idling direction, but since the idling load is set to be larger than the load for raising the stopper member 21, the spring clutch 28 rotates idly when the motor rotates in the reverse direction. I will not do it. Accordingly, the stopper member 21 moves to the restricting position as shown in FIG.

Incidentally, by a mechanical timer mechanism not shown,
Even if the motor rotates backward by a certain amount, the paper discharge roller does not rotate reversely, so that the document discharged by the paper discharge roller is not returned into the apparatus.

In the normal operation state, the stopper member 21 and the cam member 23 and the like operate correctly in the flow shown in FIGS. 3A to 3D. In some cases, it is unclear where the stopper member 21 and the cam member 23 are located. That is, FIG.
(D), the position of the cam member 23 may be unknown, and in such a case, the cam member 23 is initialized. For example, the initialization from the state shown in FIG. 3B will be described. The cam member 23 is rotated forward by a fixed amount (about 110 ° in this embodiment) from the state shown in FIG. 3B. Then, the cam member 23 is brought into the state shown in FIG. When the cam member 23 is reversed from this position by a predetermined amount (about 110 ° in the present embodiment), the position of the cam member 23 is initialized, and the state as shown in FIG.

As described above, the rotation of the cam member 23 according to the rotation direction and the rotation amount of the motor causes the stopper member 21 to rotate.
Can be moved to the restricting position or the retreat position for the document, so that an actuator such as a solenoid for operating the stopper device, which was required in the past, becomes unnecessary, and the configuration of the device is simplified, and the manufacturing cost is reduced. Reduced. Further, the control of the motor for rotating the cam member 23 is only required to slightly change the program of the control unit originally provided for document conveyance, so that it is necessary to provide a separate control unit for the actuator. In addition, the structure of the device is further simplified, and the manufacturing cost is reduced.

In the above-described embodiment, the cam member
Although the rotation amount of the rotation member 23 is set to about 110 °, the present invention is not limited to this. The angle at which the stopper member 21 can accurately move to the restriction position and the retreat position according to the shape of the cam member 23 is set. Any number of times is acceptable.

In the above-described embodiment, a facsimile apparatus is exemplified as an image processing apparatus, and an example in which the present invention is applied to a sheet feeding apparatus in the facsimile apparatus has been described. However, the present invention is not limited to this. For example, the same effect can be obtained by applying the present invention to a sheet feeding device of another image processing apparatus such as a copying machine, a printer, a scanner, or the like.

Further, in the above-described embodiment, a sheet supply apparatus for supplying a document to the reading means is exemplified as the sheet supply apparatus. However, the present invention is not limited to this. The same effect can be obtained by applying the present invention to a sheet feeding device for feeding.

[0047]

As described above, according to the present invention,
The rotation of the cam member according to the rotation direction and the amount of rotation of the drive source allows the stopper member to be moved to the restricting position or the retracted position with respect to the sheet. An actuator is not required, and the configuration of the device is simplified.
Its manufacturing cost is reduced. Further, since the control of the motor for rotating the cam member is only required to slightly change the program of the control device originally provided for sheet conveyance, it is not necessary to separately provide a control device necessary for the actuator. , And the structure of the device is further simplified,
Its manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a sheet feeding apparatus according to the present invention.

FIG. 2 is a top view of the sheet feeding device.

FIG. 3 is an explanatory diagram of an operation of a stopper device in the sheet feeding device.

FIG. 4 is a detailed perspective view of a cam shaft, a cam member, and a spring clutch that constitute the stopper device.

FIG. 5 is an external perspective view of an image processing apparatus provided with a sheet feeding device according to the present invention.

FIG. 6 is a front view of an image processing apparatus provided with a sheet feeding device according to the present invention.

FIG. 7 is a side sectional view of an image processing apparatus provided with a sheet feeding device according to the present invention.

[Explanation of symbols]

 D: Document P: Recording paper G1, G2: Gear train 1: Upper document guide 2: Lower document guide 2a: Hole 3: Preliminary transport roller 4: Preliminary transport pressing piece 5, 6, Separation roller 7, 8: Transport roller 9 … Lever 10… Spring 11… Contact image sensor 12… Document pressing part 12a… Weight shaft 12b… Document pressing plate 13, 14… Discharge roller 15… Drive shaft 16… Spring clutch 16a… Control ring 16b Locking part 17 ... Solenoid 18 ... Locking claw member 20 ... Stopper device 21 ... Stopper member 21a ... Main body portion 21b ... Locking portion 22 ... Pivot shaft 23 ... Cam member 23a ... Engaging portion 24 ... Cam shaft 25 ... Spring clutch 25a, 25b ... Protrusion Section 26 ... Bump section 31 ... Document table 31a ... Slider 32b ... Extended document tray 32 ... Document ejection tray 50 ... Device body 51 ... Recording section 52 ... Laser scanner 52a ... Laser beam oscillator 52b ... Polygon mirror 52c ... Folding mirror 53 ... Image shape Unit 53a photosensitive drum 53b primary charger 53c developing roller 53d cleaning roller 53e process cartridge 53f transfer charger 53g thermal fixing unit 53h paper discharge roller 53i drum photosensitive prevention shutter 53j paper discharge cover 54A , 54B: cassette paper feeding section 54a: paper feeding cassette 54b, middle plate 54c, middle plate spring 54d, paper feeding roller 54e, feed roller 54f, retard roller 54g, separation claw 54h, top plate 54i, lateral space 54j Jam release cover 55 ... Recording paper discharge tray 56 ... MP (multi-recording paper) cassette 56a ... MP cassette 56b ... Press-contact member 56c ... MP middle plate 56d ... MP regulating plate 56f ... MP cassette sensor 57 ... MP separation unit 57a ... MP separation roller 57b MP separation pad 57c MP separation base 58 Transport guide 59 Light cover 59a Transport roller 59b Cover side U-turn guide 59 ... U-turn guide on the main body side 59d ... Registration sensor 59e ... Paper feed guide 60 ... Control unit 61 ... Cartridge cover 62 ... ADF (automatic document feeder) cover 63 ... Partition unit 64 ... Handset 65 ... Operation unit 66 ... Display unit 67 ... Tally lamp 68 ... Original reading section

Claims (5)

[Claims] 1. A mounting device capable of mounting a plurality of sheets, a stopper device for restricting a leading end of a sheet mounted on the mounting device and releasing the restriction at a desired timing. A sheet feeding device having a sheet feeding device that conveys sheets one by one, for which the restriction by the stopper device has been released, wherein the stopper device has a restriction position for restricting the leading edge of the sheet, and a retreat position for releasing the restriction. A stopper member that can be moved to a position, a cam member that switches the position of the stopper member,
A spring clutch provided between the cam member and a drive source; and an idler for causing the spring clutch to idle. The drive source rotates the cam member in one direction via the spring clutch by a fixed amount. The stopper member is moved to the retracted position, and after the movement, the idling means sets the spring clutch in an idling state to stop the rotation of the cam member, while driving the conveying means by the driving source to convey the sheet, and The sheet feeding device according to claim 1, wherein after the conveyance, the stopper member is moved to a regulation position by rotating the cam member by a predetermined amount in another direction. 2. The motor according to claim 1, wherein the driving source is a motor for rotating the conveying unit, and the cam member rotates in one direction by a forward rotation of a motor for rotating the conveying unit in a sheet conveying direction. The sheet feeding apparatus according to claim 1, wherein the cam member is rotated in the other direction by the reverse rotation of the cam member. 3. The transporting means comprises: a preliminary transporting means for performing preliminary transporting of a sheet placed on the loading means; and a separating transporting means for separating and transporting the preliminary transported sheet one by one. The sheet feeding device according to claim 1, wherein the stopper device is disposed so as to regulate a leading end of the sheet between the conveying units. 4. A sheet supply apparatus according to claim 1, wherein said sheet supply apparatus performs predetermined processing on a sheet supplied to an image processing position by said sheet supply apparatus. An image processing apparatus comprising: 5. The image processing apparatus according to claim 4, wherein the image processing unit is an image reading unit that reads an image on a document or an image forming unit that forms an image on a recording sheet.