JPH0930658A - Hand-set sheet feeding device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-set sheet feeding device which can accommodate a large quantity of sheets. SOLUTION: A sheet stacking plate 100 is swingably mounted on a sheet acconuodator 106 capable of being opened and shut to the device body 53, and a pressurizing plate 103 for heaving the plate 100 is furnished on the side with the body 53, and the plate 100 is held in the down position besides when sheets are being fed. The plate 100 is accommodated when the accommodator 106 is shut to the body 53, and a pickup roller 108 is lifted and acconuoodated in the device body 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for feeding a sheet to an image forming apparatus such as a copying machine, a printer or a facsimile.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a sheet feeding method for supplying a sheet to an image forming means is adapted to a paper type or a paper size required from a plurality of sheet feeding cassettes containing the sheet. A sheet feeding device of an automatic feeding system that automatically selects sheets one by one in accordance with an operation of selecting a sheet feeding cassette to be used and forming an image from the sheet feeding cassette, and an operator of any type of sheet. Is provided with a so-called manual feeding type sheet feeding device.

In the automatic paper feed system using a paper feed cassette containing sheets, as shown in FIG. 9A, paper feed cassettes a and b containing necessary sheets are mounted from the side of the image forming apparatus main body. And a method of mounting the paper feed cassettes a, b, c, d from the front side of the image forming apparatus main body on which the operator operates the machine as shown in FIG. 9B.
In recent years, the latter has become mainstream in terms of reducing the installation space for the main unit.

As shown in FIG. 9B, a four-stage paper feed cassette is arranged below the main body of the image forming apparatus, and various paper types and paper sizes are provided in each paper feed cassette. The sheets are accommodated and fed one by one from the sheet feeding cassette selected by the operator to the image forming unit of the apparatus main body.

Further, in recent years, there has been a strong demand for an increase in the number of sheets to be stored in a copying machine or the like as the speed increases, and as shown in FIG. A deck type sheet storage device c'that can store a large number of sheets at one time is also used.

Further, as a so-called sheet separating system for separating and feeding the sheets one by one from a sheet feeding cassette in which a large number of sheets are stacked, as shown in FIG. 10A, a separating claw having a separating claw h is provided. The system and the retard separation system having a retard roller j that rotates in the direction opposite to the paper feeding direction as shown in FIG.

In the retard separation system, a pickup roller g feeds a sheet from stacked sheets and a feed roller i rotates in the sheet feeding direction and a retard roller j rotates in a direction opposite to the sheet feeding direction. It separates the sheets one by one and sends them out.

The retard roller j is driven by a torque limiter k in the direction of the arrow m in the figure, and when one sheet is fed, this drive is performed by the torque limiter k.
When two or more sheets are fed by being driven by the arrow roller n in the direction indicated by the arrow n, the coefficient of friction between the sheets is smaller than the coefficient of friction between the rollers and the retard roller j.
Rotates in the direction of arrow m and returns the second and subsequent sheets.

As another sheet separating method, there is a pad separating method using a friction pad. This is for separating sheets by using the difference in friction coefficient between the paper feed roller and the separation pad, which is not suitable for a large-capacity sheet storage device, but is used for a manual sheet feeding device because of its simple structure. In many cases.

[0010]

However, while the demand for increasing the number of sheets to be stored and the diversification of the types and sizes of the sheets are becoming stronger, the conventional configuration makes it possible for the operator to select the desired paper type and paper size. In order to obtain a size of sheet, it is necessary to perform a complicated work of replacing a plurality of sheet feeding cassettes in which various sheets are stored and using the sheet feeding cassette, and it is not possible to cope with the situation.

Therefore, in order to eliminate these troubles, it is possible to accommodate a large number of sheets in a sheet feeding apparatus of a manual feeding type capable of feeding various sheets (hereinafter referred to as a manual sheet feeding apparatus). Is desired. However, at present, a manual sheet feeding device capable of stacking up to 50 sheets with a weight of 80 kg / m ² is implemented, but a large capacity manual sheet feeding device capable of stacking up to 250 sheets has not yet been implemented. .

In the manual sheet feeding device which is currently used, a pickup roller descends and feeds toward the upper surface of a stacked sheet, or a middle plate on which a sheet is stacked by a spring is attached upward. There is one in which the upper surface of the sheet is pressed against the sheet feeding roller and the middle plate is pushed down by a cam or the like every time the sheet is fed one by one by the sheet feeding roller.

In the case where the pickup roller is lowered to feed the sheet, the pickup roller cannot move up and down because the pickup roller has a limited vertical distance, and the cam and the spring move the intermediate plate up and down. However, even with this type, there is a limit to the vertical distance of the middle plate, and there is also a limit to the biasing force of the spring, so that this type cannot accommodate and send out a large capacity sheet. For this reason, at present, no large-capacity manual sheet feeding device is implemented.

Further, the manual sheet feeding apparatus is generally arranged on the side surface of the apparatus main body, and the manual sheet feeding apparatus is housed in the apparatus main body in order to miniaturize the apparatus main body. However, in a manual sheet feeding device that supplies a large amount of sheets, the feeding device itself becomes large and it is difficult to accommodate it in the device body.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to accommodate a large capacity sheet in a manual sheet feeding device.

[0016]

SUMMARY OF THE INVENTION The present invention is a manual sheet feeding apparatus for feeding a sheet to an image forming unit of an image forming apparatus, which is connected to the apparatus body of the image forming apparatus, and is rotated to the apparatus body. Freely attached support means, sheet stacking means for swingably supported by the support means, for stacking sheets, sheet feeding means for sending out the sheets stacked on the sheet stacking means, and the apparatus main body And a pressing means for moving the sheet stacking means between a sheet feeding position and a descending position for the sheet feeding means to feed the sheet, and a sheet feeding means for feeding the sheet stacking means at the time of sheet feeding. And a control means for maintaining the sheet stacking means in the lowered position except when the sheets are being fed, and when the supporting means is rotated toward the apparatus main body, Characterized by comprising housing the stacking means to the apparatus main body.

The control means detects an upper limit detection sensor for detecting the sheet feeding position of the sheet stacking means, a lower limit detection sensor for detecting the lowering position of the sheet stacking means, and the above-mentioned addition based on detection signals from these sensors. It is characterized by comprising a control unit for moving up and down the pressure means.

The sheet feeding means is rotatably provided so as to project outward from a side surface of the apparatus main body and is accommodated in the apparatus main body in association with the rotation of the supporting means toward the apparatus main body side. Is characterized by.

The pressurizing means raises the sheet stacking means to the sheet feed position after the sheet feed start timing to the image forming means, and lowers the sheet stacking means to the descend position after the sheet feed end timing. Characterize.

The paper feed end timing is a timing based on a sheet jam detection signal, a no-sheet detection signal on the sheet stacking means, or an image formation operation end signal.

Further, the present invention is a manual sheet feeding device which is connected to the main body of an image forming apparatus and supplies a sheet to the image forming means of the image forming apparatus, which is attached to the main body of the apparatus in a freely openable and closable manner. A supporting means, a sheet stacking means that is swingably supported by the supporting means, and is positioned outside the side surface of the apparatus body when the supporting means is opened from the apparatus body, and stacks sheets; and the sheet stacking means. Sheet feeding means arranged so as to project from the side surface of the apparatus body for feeding the stacked sheets, and the sheet stacking means and the sheet feeding means when the supporting means is closed to the apparatus body. The means is housed in the main body of the apparatus.

The sheet feeding means is swingably provided, and the sheet feeding means is swung to be housed in the apparatus body in association with the closing operation of the supporting means in the apparatus body. And

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a main body 53 of a copying machine 51, which is an image forming apparatus, has a reading means 54 for reading an image of an original document and an image read by the reading means 54 for transferring the image onto a sheet. Image forming means 52,
A sheet feeding device 1 that feeds sheets from the sheet feeding cassettes 65U and 65L is built in the image forming unit 52.

The reading means 54 includes a platen 55 on which an original is placed, a light source 56 for irradiating the original on the platen 55 with light, and a mirror for sending the light reflected by the original to the image forming means 52. 58, 59, 60, 61, 6
2 and a lens 63 and the like arranged in the optical path.

The image forming means 52 is a photosensitive drum 52a.
A developing device 52b for developing an electrostatic latent image formed by the light irradiated on the charged photosensitive drum 52a, and a transfer device for transferring the toner image on the photosensitive drum 52a developed by the developing device to a sheet. It is composed of a charger 52c and the like. The sheet on which the toner image is transferred by the image forming unit 52 is sent to the fixing device 70 by the conveyor belt 69 and fixed, and then discharged by the paper discharge roller 72.

The sheet feeding device 1 includes a guide rail 64a,
To separate the pickup roller 12 for feeding the sheets stored in the detachable paper feed cassettes 65U and 65L from the front side of the apparatus main body 53 along the line 64b and the sheets fed by the pickup roller 12 one by one It is composed of a separating section composed of the feed roller 9 and the retard roller 10. Paper feed cassette 65
The U and 65L are each provided with an intermediate plate 5 for stacking sheets, and the apparatus main body 53 side is provided with a pressure plate 6 for pushing up the intermediate plate 5 and a drive mechanism (not shown) for rotationally driving the pressure plate 6. Has been.

On the side surface of the apparatus main body 53, there is provided a manual sheet feeding type sheet feeding apparatus (hereinafter referred to as a manual sheet feeding apparatus) 99 which will be described in detail later.

The sheet sent out from the separating section is further sent to the registration roller pair 67 by the carrying roller pair 85. The registration roller pair 67 corrects the skew of the sheet sent from the conveying roller pair 85 or the manual sheet feeding device 99, and further sends the sheet to the image forming unit 52 in synchronization with the image forming timing with the image forming unit 52.

A re-conveyance path 73 is provided between the conveyor belt 69 and the sheet feeding cassette 65U, and when double-sided copying or multiplex copying is desired, a sheet on which an image has been once formed is discharged to the discharging roller 72. It is sent to the re-conveyance path 73 by the flapper 71 on the upstream side, and then returned to the image forming unit 52 from the re-conveyance path 73.

The guide rails 64a and 64b are positioned and installed on the machine body frame, and the front and rear side plates 23,
17 (see FIG. 4) grooves (not shown)
The sheet feeding device 1 is positioned by fitting with b. A groove (not shown) 64c into which the pressure plate 6 is inserted is engraved on the guide rail 64b.

The sheet feeding apparatus 1 includes upper and middle lower stays 86, which are arranged substantially parallel to the front and rear side plates 23, 17.
In a frame composed of 87 and 89, paper feed rollers 12 and 12, transport rollers 9 and 9, separation rollers 10 and 10, pressure plate 6,
6, positioning sensors 15, 15 and guide plates 79, 8
It is provided with 0, 81, 82, 83 and a pair of transport rollers 85, and is thus an integrated unit. In the figure, 49 and 88 indicate sheet sensors.

Further, between the front and rear side plates 23, 17 is shown in FIG.
As shown in FIGS. 3 and 4, the pickup release shaft 27
U and 27L are pivotally supported, and release plates 27Ua, 27Ub and 27Uc are fixed to the shaft 27U from the front side, and the release plates 27La, 27Lb and 27L are attached to the shaft 27L.
c is fixed. Further, the release plate 27Uc is adapted to engage with a pin 28Ua of a release arm 28U which is rotatably supported by the transport roller shaft 9a described later, and the release plate 27Lc is supported by the transport roller shaft 9a described later. Pin 28 of release arm 28L rotatably supported
It is adapted to engage with La.

The guide plate 82 is rotatably supported on the back side by a bearing 90 which is disposed on the rear side plate 17 and rotatably supports the shaft 37U, and the front side is provided on the front side plate 23. It is rotatably supported by the pin 29. Further, the guide plate 83 is rotatably supported on the back side by a bearing 90 which is disposed on the rear side plate 17 and rotatably supports the shaft 37L, and the front side is fixed on the front side plate 23.
It is rotatably supported by a pin 29 provided on the. Furthermore, the guide plates 82 and 83 are connected by a link arm 91, and the guide plate 83 is connected to the link arm 9.
2 is connected to a cover 53a that opens a part of the machine body 53.

Therefore, the paper feed cassettes 65U, 65L
When the sheet sent from the sheet jams during the conveyance, the cover 53a is opened to lift the pickup roller 12 from the upper surface of the sheet as shown in FIG. 3, and further, the guide plates 82 and 83 are opened to jam the sheet. Can be taken out easily.

Next, the structure of the manual sheet feeding device 99 will be described. As shown in FIG. 5, the manual sheet feeding device 99 includes a sheet stacking plate 100 for stacking sheets,
A side regulating plate 101 for regulating and positioning both ends of the stacked sheets, a pressure plate 103 for pushing up the sheet stacking plate 100, a sheet presence sensor (not shown),
The upper limit detection sensor 104, the lower limit detection sensor 105, and a sheet container 106 that is a supporting unit rotatably attached to the apparatus main body 53 are included.

The sheet stacking plate 100 is a sheet container 106.
The pressure plate 103 is swingably supported by the sheet feeding plate 100, and the pressure plate 103 is rocked by a drive mechanism (not shown) provided on the side of the apparatus main body 53 to rotate to move the sheet stacking plate 100 up and down. . The side regulation plate 101 is attached to the sheet stacking plate 100 so as to be movable in the width direction of the stacked sheets, and the sheets are positioned by pressing them on both sides of the stacked sheets.

The sheet stacking plate 100 is provided on the apparatus main body 53 side.
A pickup roller 108 that comes into contact with the upper surface of the sheet stacked on the top and sends out the sheet, and a separation unit of a retard separation type that includes a feed roller 111 and a retard roller 112 for separating the sheet sent out by the pickup roller 108. A pull-out roller pair 114 for pulling out the sheet separated by the separating means,
Is provided.

The pickup roller 108 is swingably supported by a shaft (not shown) of the feed roller 111 as a fulcrum, and is provided so as to come into pressure contact with the upper surface of the sheet with a constant pressure. The pickup roller 108 is separated from the upper surface of the sheet by a solenoid 113 at a predetermined timing described later.

The upper limit detection sensor 104 is turned on / off according to the ascending / descending position of the pick-up roller 108, and the sheet stacking plate 100 is pushed up by the pressure plate 103, and the sheet on which the pick-up roller 108 is stacked is inserted. When lifted, as shown in FIG. 6, when the top of the sheet reaches the sheet feeding position, the flag 1
The upper limit detection sensor 104 blocks the upper limit of the pressure detecting plate 104 from stopping the pushing-up operation of the pressure plate 103, so that the upper surface of the sheet can be always maintained at the sheet feeding position.

The lower limit detection sensor 105 is the sheet stacking plate 1
It is turned on / off according to the ascending / descending position of 00, and when the sheet feeding operation is completed or when the sheets are exhausted, the pressure plate 103 lowers the sheet stacking plate 100, and as shown in FIG. The flag 110 indicates the lower limit detection sensor 105.
When the sheet is shielded from light, the operation of the pressure plate 103 is stopped and the sheet stacking plate 100 is maintained in the lowered position. The pressure plate 1
The raising / lowering operation of 03 is appropriately controlled by the control unit (CPU) based on the detection of the detection sensors 104 and 105.

The sheet container 106 is rotatably provided on the apparatus main body 53 around the fulcrum P. When the manual sheet feeding apparatus 99 is not used, as shown in FIG. The manual sheet feeding device 99 is housed in the device main body 53 by rotating and closing.
Further, when the sheet container 106 is closed on the side of the apparatus main body 53, the side regulation plate 101 causes the pickup roller 108 to move.
Is pushed up and rotated to be stored in the apparatus main body 53.

The operation of forming an image on the sheet supplied from the manual sheet feeding device 99 in the above-mentioned structure will be described with reference to FIGS.

The sheet container 106 is opened from the apparatus main body 53, and desired sheets are stacked on the sheet stacking plate 100. When the manual feed sheet feeding device 99 is selected and the start key is pressed, a drive mechanism (not shown) rotates the pressure shaft 107 by the control means to swing the pressure plate 103 and push up the sheet stacking plate 100. When the sheet stacking plate 100 rises, the upper surface of the stacked sheets comes into contact with the pickup roller 108 and pushes it up, and when the upper surface of the sheet reaches the sheet feeding position, the flag 109 sets the upper limit detection sensor 104.
By shutting off the light, the drive mechanism stops and the pressure plate 103
Stops rising.

Next, the pickup roller 108 rotates to send out the sheet, and the sheet is separated one by one by the feed roller 111 and the retard roller 112 of the separating section. A predetermined time after the leading edge of the sheet reaches the nip between the feed roller 111 and the retard roller 112, the solenoid 113 is excited and the pickup roller 108 is lifted to reliably separate the sheet at the separating portion.

As described above, when the number of sheets sent out by the pickup roller 108 is one, the torque limiter (not shown) shuts off the drive of the retard roller 112 and separates the sheet from the retard roller 112.
Turns to the seat. Further, when the number of sheets is two or more, the friction coefficient between the rollers and the sheet is larger than the friction coefficient between the sheets, and therefore the drive is transmitted to the retard roller 112 to return the sheets other than the uppermost sheet.

The sheet thus separated is conveyed by the pull-out roller pair 114 to the registration roller 67.
Sent to The registration roller 67 corrects the skew of the sheet and feeds it at the image forming timing of the image forming means. After that, an image is formed on the sheet and the sheet is discharged. Then, when the control unit inputs a termination signal at the end of the image forming operation, a sheet absence signal at the time of detecting the sheet absence, etc., the control unit controls a drive mechanism (not shown) to lower the pressure plate 103. When the sheet stacking plate 100 is lowered by the lowering of the pressure plate 103 and the flag 110 shields the lower limit detection sensor 105 from light, the drive mechanism is stopped and the sheet stacking plate 100 is maintained at the lowered position.

When a jam occurs, the control unit stops the copying operation and the display unit (not shown) indicates that the jam has occurred. Then, the solenoid 113 is demagnetized to lower the pickup roller 108, and further the pressure plate 103 is rotated to lower the sheet stacking plate 100 until the lower limit detection sensor 105 detects it. Then, the jammed sheet is removed based on the jam position display.

The above operation will be described with reference to the flowchart of the copying machine shown in FIG.

When the number of copies and the like are input and the copy button is pressed, it is detected in step 1 whether sheets are stacked on the sheet stacking plate 100. If there is no sheet, the display of no sheet is displayed and the operation cannot proceed any further. When a sheet is detected, the pressure plate 10 is pressed in step 2.
3 is raised, and in step 3, the upper limit detection sensor 10
It is determined whether the detection of 4 is performed. Upper limit detection sensor 104
If the detection is performed, the process proceeds to step 4 to start sheet feeding and perform the image forming operation.

In step 5, it is determined whether or not a jam has occurred by detecting whether the sheet is fed within the regular time. When it is determined that the sheets have not been sent within the regular time, the process proceeds to step 6 to stop the image forming operation, and the pressure plate 103 is rotated to lower the sheet stacking plate 100 in steps 7 and 8.
When the sheet stacking plate 100 descends, the copy operation ends (step 9).

When the sheet passes in the regular time in step 5, the counter is incremented by 1 in step 10. In step 11, the input number of copies and the count number are compared. If the count number is small, the process proceeds to step 12 and the sheet presence / absence sensor detects the presence / absence of a sheet. If there is a sheet, the process proceeds to step 4 to further advance the image forming operation. Step 1 if there are no seats
3, the pressure plate 103 is rotated in step 14, the sheet stacking plate 100 is lowered, and the copy operation is completed (step 15).

When it is determined in step 11 that the number of copies input and the count number are the same, step 13,
The process proceeds to steps 14 and 15 to end the copy operation.

Next, a method of storing the manual sheet feeding device 99 in the device main body 53 will be described.

As described above, the pressure plate 103 is always kept in the lowered position except during the image forming operation. The sheet container 106 is moved around the fulcrum P of the sheet stacking plate 100.
At the same time, it is rotated toward the device body 53. At that time, the pickup roller 108 is pushed up by the side regulating plate 101 and is housed in the apparatus main body 53.

When the sheet container 106 is rotated to the apparatus main body 53 side, the pressure plate 103 and the sheet stacking plate 1 are always provided.
Since 00 is in the lowered position, the selection area of the installation position of the rotation fulcrum P of the sheet container 106 is expanded. Further, even if the pickup roller 108 projects laterally from the side surface of the apparatus main body 53, when the sheet container 106 is rotated toward the apparatus main body 53 side, the pickup roller 108 is also rotated and accommodated by the side regulation plate 101. Therefore, it is not necessary to provide the rotation fulcrum P of the sheet container 106 outside the apparatus main body. Therefore, the manual sheet feeding device 99 does not take up a large space for installation in the device body 53 and does not project laterally, so that the device body 53 can be downsized.

Further, when a jam occurs in the conveyance path on the side of the apparatus main body 53, the cover 53a may be opened for processing, but the sheet container 106 of the manual sheet feeding apparatus 99 may be processed.
If the device is rotated to the device body 53 side and accommodated, the device body 5
Since the manual sheet feeding device 99 does not project to the side of the jam clearance 3 on the side of 3, the processing space can be widened and the operability of the jam clearance can be improved.

In the example of the embodiment of the present invention, an example having the separating means of the retard separation system composed of the feed roller 111 and the retard roller 112 has been shown, but the manual sheet feeding having the separation system using the separation pad is shown. The present invention may be applied to a sending device.

[0059]

As described in detail above, a large-capacity sheet can be stacked and fed in the manual sheet feeding apparatus, and further, it can be stored in the apparatus main body. Moreover, the size of the image forming apparatus main body is not increased.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of an image forming apparatus including a manual sheet feeding device of the present invention.

2 is a cross-sectional view showing a sheet feeding device provided in the image forming apparatus of FIG.

FIG. 3 is a diagram showing a processing method when a jam occurs in the image forming apparatus of FIG.

FIG. 4 is a front view of the sheet feeding device shown in FIG.

FIG. 5 is a sectional view showing an example of a manual sheet feeding device of the present invention.

FIG. 6 is a diagram showing a sheet feeding state of the apparatus shown in FIG.

FIG. 7 is a diagram showing a state in which the device shown in FIG.

FIG. 8 is a flowchart showing sheet feeding control by the manual sheet feeding device shown in FIG.

FIG. 9 is a vertical sectional view showing an example of a conventional image forming apparatus.

FIG. 10 is a perspective view showing a separation method in a conventional sheet feeding device.

[Explanation of symbols]

 51 Copier (Image Forming Device) 53 Main Body 99 Manual Sheet Feeding Device 100 Sheet Stacking Plate (Sheet Stacking Means) 103 Pressurizing Plate (Pressurizing Means) 104 Upper Limit Detection Sensor 105 Lower Limit Detection Sensor 106 Sheet Container (Supporting Means) 108 Pickup roller (sheet feeding means)

Claims (9)

[Claims] 1. A manual sheet feeding device, which is connected to an apparatus body of an image forming apparatus and supplies a sheet to an image forming means of the image forming apparatus, comprising a supporting means rotatably attached to the apparatus body. A sheet stacking unit that is swingably supported by the supporting unit and stacks sheets; a sheet feeding unit that sends out the sheets stacked on the sheet stacking unit; and a sheet stacking unit that is provided in the apparatus main body. Pressing means for moving the sheet feeding means between the sheet feeding position and the lowered position for feeding the sheet, and the sheet stacking means is maintained at the sheet feeding position during sheet feeding, Control means for maintaining the sheet stacking means in the lowered position except when the time is set, and when the supporting means is rotated to the apparatus body side, the sheet stacking means is provided in the apparatus body. A manual sheet feeding device characterized by being housed in a sheet. 2. The control means is based on an upper limit detection sensor for detecting a sheet feeding position of the sheet stacking means, a lower limit detection sensor for detecting a lowered position of the sheet stacking means, and detection signals from these sensors. The manual sheet feeding device according to claim 1, further comprising a control unit that raises and lowers the pressing unit. 3. The sheet feeding means is rotatably provided so as to project outward from a side surface of the apparatus body, and is accommodated in the apparatus body in association with rotation of the supporting means toward the apparatus body side. The manual sheet feeding device according to claim 1, wherein: 4. The pressurizing unit raises the sheet stacking unit to a sheet feed position after a sheet feed start timing for the image forming unit, and lowers the sheet stacking unit to a sheet drop position after a sheet feed end timing. The manual sheet feeding device according to claim 1, wherein: 5. The sheet feeding end timing is a timing based on a sheet jam detection signal, a no-sheet detection signal on the sheet stacking unit, or an image forming operation end signal. Manual sheet feeding device. 6. A manual sheet feeding device, which is connected to an apparatus body of an image forming apparatus and supplies a sheet to an image forming means of the image forming apparatus, comprising support means openably and closably attached to the apparatus body. A sheet stacking unit that is swingably supported by the supporting unit, is positioned outside the side surface of the apparatus main body when the supporting unit is opened from the apparatus main body, and stacks sheets, and is stacked on the sheet stacking unit. A sheet feeding unit arranged so as to project from a side surface of the apparatus main body for feeding sheets, and the sheet stacking unit and the sheet feeding unit when the supporting unit is closed to the apparatus main body. A manual sheet feeding device characterized by being housed inside. 7. The sheet feeding means is swingably provided, and the sheet feeding means is swung to be housed in the apparatus body in association with an operation of closing the supporting means in the apparatus body. The manual sheet feeding device according to claim 6. 8. A manual sheet feeding device according to claim 1, and an image forming unit for forming an image on a sheet fed from the manual sheet feeding device. An image forming apparatus characterized by. 9. The image forming apparatus according to claim 8, further comprising a paper feed cassette detachable from the front of the apparatus body, wherein the manual sheet feeding apparatus is arranged on a side surface of the apparatus body.