JP3208675B2 - Paper feeder - Google Patents

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 sheet-like paper in an image forming apparatus such as a copying machine, a facsimile, and a printer. The present invention relates to improved sheet-like recording paper and improved conveyance.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a facsimile, a printer, or the like, a sheet-like sheet deposited on a paper tray, a paper feed cassette, a paper stacker, a stack tray for placing a document, etc. Alternatively, there is provided a sheet feeding device for sequentially taking out one sheet at a time from the bottom and sending it to an image recording unit or the like.

For example, in order to transfer a toner image formed on an image forming body onto a transfer material in a timely manner, a recording paper conveyed from a paper feed cassette via a pickup roller and a feed roller is previously abutted against a registration roller. The registration roller is stopped in a state where the slack is formed, and the registration roller is driven in synchronization with the scanning start operation of the optical system for reading the document information, and the recording paper is nipped and transported to the transfer area. The paper sheet feeding and unloading device disclosed in Japanese Patent Application Laid-Open No. 50-73374 uses a vacuum suction mechanism to detect a sheet with a thickness detection lever and a pressure detection lever that are displaced according to the thickness and pressure of the paper sheet. Then, the motor is driven to control the paper sheet conveying speed.

[0004] Similarly to the above-mentioned paper feeding device, a re-feeding device for recording on an intermediate tray at the time of double-sided recording / multiple recording performs feeding, separation, feeding and conveyance of recording paper.

In an automatic developing and conveying apparatus, originals fed one by one from a document mounting table (stack tray) on which sheet-shaped originals (hereinafter simply referred to as originals) are mounted are fed by a feeding belt to the originals. The sheet is fed onto a platen glass, where the sheet is exposed by an exposure unit lamp in the copying machine main body, and is further conveyed to a document discharge table. JP-A-60-3
The bottom sheet separation feeding device disclosed in Japanese Patent No. 6248 is to perform sheet separation by supplying compressed air between sheets by air injection means, and controls the flow rate of air according to different sheet stack amounts. It has become.

[0006]

In a high-speed copying machine capable of copying at a speed of 50 sheets or more per minute,
There is a need for an automatic document feeder that feeds a document onto a platen glass in a quick and reliable manner, and a recording sheet feeder that feeds and feeds a copy sheet at a high speed from a feed cassette or an intermediate tray. In these automatic document feeders and recording sheet feeding devices, a large number of various document bundles and recording sheet bundles are stacked on a stack tray or the like, and until the feeding is completed.
High-speed feeding must be maintained to prevent feeding errors and double feeding. The original or recording sheet to be sent has different feeding conditions depending on the size type (for example, B5 to A3), the thickness (thick, thin sheet), the number of stack sheets, and the like, so that feeding becomes extremely unstable. .

In order to prevent this problem, the paper feeder provided with a vacuum belt device and a vacuum suction mechanism has a problem that the mechanism is complicated and large-scale, and noise is generated. Further, in the sheet feeding and unloading device disclosed in Japanese Patent Application Laid-Open No. 50-73374, the sheet pressing force can be changed only in two stages, and cannot be adapted to the complicated feeding conditions.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the paper feeder in an automatic document feeder and a recording sheet feeder, and adjusts the size, paper quality, number of sheets, etc. of the document and the recording sheet. To automatically change the sheet pressure,
The purpose is to reliably and stabilize high-speed sheet feeding. It is another object of the present invention to make it possible to change and set the sheet pressing force at the time of feeding even under conditions specified by an operator, thereby enabling stable feeding in accordance with various feeding conditions.

The object of the present invention described above is as follows.
Achieved. 1. Stack tray (11) for stacking and supporting a plurality of sheets
0) and the sheets stacked on the stack tray (110).
Feeding means (1) for feeding a sheet in contact with a part of the
23) and close to the stack tray (110).
Support the sheet and feed the sheet
Movable pressing member (112) for pressing against the pressing means (123)
And an elastically deforming portion for urging the movable pressing member (112).
Through the material (119) and the elastically deformable member (119)
A driving member (1) for moving the movable pressing member (112)
18) driving means for driving the driving member (118)
(M1), the amount of deformation of the elastic deformation member (119),
Or the movable pressing member (112) and the driving member (118).
A first detection member (PS3) for detecting a relative position;
Home position for detecting initial position of drive member (118)
Configuration sensor (PS4) and control means.
The control means is provided by the driving means (M1).
Driving the driving member (118) at the initial position,
The movable pressing member (1) is connected via an elastic deformation member (119).
12) is moved to a position on the movable pressing member (112).
The stack of sheets to be stacked is pressed by the delivery means (123).
And that the sheet bundle has been pressed at the initial set pressure.
No. 1 detection member (PS3), and further detects the initial position.
From the position until the pressure contact at the initial set pressure is detected.
The movable pressing member (1) is determined based on the displacement amount of the driving member (118).
12) Detecting the thickness of the sheet bundle stacked on top
Characteristic paper feeder. 2. Stack tray (11) for stacking and supporting a plurality of sheets
0) and part of the sheets stacked on the stack tray.
Feeding means (125) for feeding a sheet in contact with the sheet;
A movable pressing member for supporting the delivery means (125)
(112) and urge the movable pressing member (112).
An elastic deformable member (119), said elastically deformable member (11
9) moving the movable pressing member (112) through
A driving member (118) for driving the driving member (118)
Drive means (M1) for performing the elastic deformation member (119)
The amount of deformation of the movable pressing member (112) and the driving member
(118) a first detection member (P
S3) detecting the initial position of the driving member (118).
Home position detection sensor (PS4) and control means
And the control unit is configured to control the driving unit (M
The driving member (118) in the initial position according to 1).
Is driven, and the movable member is driven through the elastic deformation member (119).
By moving the dynamic pressing member (112), the stack tray is moved.
B) sending the sheet bundle stacked on
Pressed to step (123)
The first detection member (PS3) detects,
From the initial position until the pressure contact at the initial set pressure is detected
From the amount of displacement of the driving member (118).
Detecting the thickness of the sheet bundle stacked on the ray (110)
A sheet feeding device, characterized in that: 3. The control means includes a displacement amount of the driving member (118).
Detecting by a pulse count
3. The sheet feeding device according to 1 or 2. 4. The control means controls the first detection member (PS3).
Information on the thickness of the sheet bundle detected by the
Data that includes size information and sheet thickness information
The driving member (118) is controlled by a table to control the seat.
Before the bundle is pressed against the delivery means (123).
The paper is fed by activating the feeding means.
4. The paper feeding device according to the above 3, wherein 5. The movable pressing member (112) and the driving member (11
8) means opening by the elastic deformation member (119).
And the movable pressing member (112) is moved forward.
Do not open the drive member (118) beyond a certain amount.
Any one of the above-mentioned items 1 to 4,
2. The paper feeding device according to claim 1.

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is an overall configuration diagram of an image recording apparatus (copier) to which the sheet feeding device of the present invention is applied.

In the figure, 1 is a copying machine main body, 2 is a scanning exposure optical system, 3 is an image forming means around the photosensitive drum 31,
Is copy paper supply means (paper supply means), 5 is copy paper transport means,
Reference numeral 6 denotes a fixing unit, 7 denotes a reversal sheet discharge switching unit, 8 denotes a reversal conveyance unit, 9 denotes a double-sided recording paper conveyance unit (ADU), and 10 denotes an automatic document feeder (ADF) with a double-sided document automatic reversal function.

The paper feed section 41 of the copy paper supply means 4, the paper feed section 91 of the double-sided recording paper transport means 9, and the paper feed section 12 of the automatic document feeder 10 all have similar structures. The automatic document feeder 10 will be described in detail.

FIG. 2 shows an automatic document feeder 10 according to the present invention.
3 is a partial plan view of the automatic document feeder, and FIG. 4 is a configuration diagram showing a drive system (power transmission system) of the automatic document feeder.

As shown in FIG. 1, the automatic document feeder 10 is installed on the main body 1 of the copying machine, and separates one document D from the document stacking section 11 for stacking the document stack. Feeder 12 to feed the original D, and the original D fed from the feeder 12
Transport section 13 for transporting the paper to a predetermined position on platen glass 21
Discharging the document D sent from the transport unit 13 after the image exposure to a discharge tray or a post-processing device,
And a paper discharge reversing unit 14 for reversing the image-exposed document and feeding it on the platen glass 21 again.

A stack tray (document placing plate) 110 for stacking a bundle of documents is fixed to the document placing section 11, and a width regulating plate 111 for regulating the width of the document is provided on the stack tray 110. Is movably provided.

When the document bundle D is placed on the stack tray 110, the presence or absence of a document on the stack tray 110 is detected by a document set detection sensor (zero document detection sensor) PS1. ADF
The mode is displayed. When the document bundle D is set at a predetermined position, the document size (B5 to A3) is detected by the document size sensor PS2 and input to the control unit of the copying machine main body 1.

A movable pressing plate (movable pressing member) 112 is provided at the leading end side of the stack tray 110 at the document feeding downstream side with a swing shaft 114 supported by a bearing 117A provided on one side plate 113A and the other side plate 113B. Respectively, and can swing about these pins.

The two side plates 113A and 113B are combined with the bottom plate 116 to be integrated. Bearing 117 provided on the side plate 113A
A gear G1 is fixed to the shaft end of the oscillating shaft 114 that penetrates A and a bearing 117B provided at the rising portion of the fixed bottom plate 116, and meshes with a gear G2 fixed to the drive shaft of the pressing motor M1. ing.

A drive plate (drive member) 1 is mounted on the swing shaft 114.
18 is screwed and can swing together. An elastically deformable member (for example, a torsion spring) 119 is wound around the swinging shaft 114, and both ends of the elastically deformable member are driven by the driving plate 118.
The central portion is capable of pressing the movable pressing plate 112. At this time, the movable pressing plate 112 and the driving plate 118 are pushed in the opening direction by the torsion spring 119, but the movable pressing plate 1
The end of 12 is in contact with the drive plate 118 so that the gap does not open more than a certain amount. Also, the torsion spring at this time
The spring force of 119 is adjusted so as to be equal to or less than an initial set pressure described later.

Actuator portions (light-shielding portions) 118A and 118B protrude at two places on the rear side of the drive plate 118 by bending. The actuator unit 118A turns on and off the optical path of a pressure detection sensor (for example, a photo interrupter) PS3 fixed to the movable pressing plate 112. The actuator 118B includes a home position detection sensor (for example, a photo interrupter) PS fixed to the fixed bottom plate 116.
The optical path of No. 4 is turned on / off, and the home position of the driving plate 118 is detected.

A paper feed section 12 is provided on the downstream side of the movable pressing plate 112 in document feeding. The paper feeding unit 12 includes a document leading end stopper 120, a driving roller 121, a driven roller 122, a feed belt 123 that winds and rotates these rollers, and a double feed prevention reverse roller 124 located below the feed belt 123. I have. The driving force of the driving motor M2 is transmitted to the driving roller 121 via an electromagnetic clutch CL1.

On the downstream side of the document feeding section 12 from the document feeding section, a conveying section 13 is provided. The transport unit 13 includes a first intermediate transport roller 13
0, document passage detection sensor PS5, curved guide plate 131,
Second intermediate transport roller 132, drive roller 133 and driven roller 13
4 and 3 original holding rollers 135 and tension rollers 136
The transport belt 137 is stretched between them.

A clutch C is provided on the shaft of the driving roller 133.
L2 and the brake BRK are pivotally supported, and are operated by the driving force of the driving motor M2.

The paper discharge reversing section 14 includes a paper discharge roller 140, a switching claw 1
41, plural transport rollers 142, 143, 144 and guide plate 14
5, 146, 147, etc. The paper discharge roller 140 and the transport rollers 142 to 144 are driven by a paper discharge motor M3. The switching claw 141 is driven by a solenoid SOL.

The dashed line in FIG. 2 shows the transport path of the original D discharged from the paper discharge reversing unit 14 to the external paper discharge tray 148.

FIG. 5 shows a document placing section before placing the document bundle D.
FIG. 5A is a cross-sectional view of the home position detection sensor PS4, and FIG.
(B) shows a sectional view centering on the pressure detection sensor PS3. FIG. 6 is a cross-sectional view showing a process in which the movable pressing plate 112 is driven after the original stack D is loaded on the original placing portion 11, FIG. 7 is a cross-sectional view showing a state in which paper can be fed, and FIG. FIG. 9 is a flowchart of a paper operation process, and FIG. Hereinafter, the document feeding operation will be described.

(1) In the state shown in FIG. 5, when the main switch of the copying machine main body 1 is turned on, the pressing motor M1 is rotated, and the movable pressing plate 112 detects the initial stop position by the home position detecting sensor PS4. Then, the pressing motor M1 is stopped. That is, the home position detection sensor PS4 is on at the home position. If the main switch is on and the home position detection sensor PS4 is off, the pressing motor M
1 is rotated in the reverse direction, and the home position detection sensor PS4
Is turned on, the pressing motor M1 is stopped, and the driving plate 118 and the movable pressing plate 112 are stopped at the lowest initial positions. If the home position detection sensor PS4
Is turned on, the pressing motor M1 is rotated forward once, the home position detection sensor PS4 is turned off, and then the motor M1 is rotated reversely, and the sensor PS4 is turned on.
Is turned on, the motor M1 is stopped and the home position is set. This is effective for absorbing the time lag between the driving gear and the sensor ON. At the home position stop position, a clearance L that can accommodate a predetermined maximum amount of the document bundle D is held.

(2) When the original bundle D is placed on the stack tray 110 and the movable pressing plate 112, the original set detection sensor PS1 is turned on, and the ADF mode is set. At the same time, the document size sensor PS2 is turned on to detect the document size (see FIGS. 2 and 8).

(3) When the copy button is turned on, the ADF
Then, the copy motor can be started, and the pressing motor (stepping motor) M1 starts driving rotation, and the movable pressing plate 11 is driven by the driving member 118 fixed to the swing shaft 114 and the spring 119.
2 swings and the leading end thereof rises, and the loaded document bundle D
Lift up. During the ascending process, the swing angle of the swing shaft 114 is changed to a pulse count A by a rotary encoder or the like.
Is counted (see FIGS. 6 and 7).

(4) When the upper surface of the original bundle D loaded on the movable pressing plate 112 is pressed against the outer peripheral surface of the feed belt 123, the movable pressing plate 112 stops while holding the original bundle. The drive plate 118 is further driven and rotated, and rotates counterclockwise while compressing the torsion spring 119, so that the distance m between the movable pressing plate 112 and the drive plate 118 is reduced.

(5) When the distance m reaches the set distance,
The actuator unit 118A at one end of the driving plate 118 turns on the pressing detection sensor PS3 fixed to the movable pressing plate 112,
The pressure reaches the initial set pressure (for example, 50 g), and the counting of the count A stops.

(6) The thickness of the original bundle D is detected from the output of the count A, and is determined in advance by the original size detected by the original size sensor PS2 or the setting input of thick paper or thin paper. The designated pulse is determined by the pressing pulse table shown in Table 1 below.

[0035]

[Table 1]

The thickness of the original paper bundle is detected by the count value of the count A by the pressure detection sensor PS3. In Table 1, the thickness of the paper bundle is classified into, for example, three levels of large, medium and small.

The original paper size is, for example, B5 to B5.
A3 size is set, which is determined by the original size sensor PS2.
Is detected by When a plurality of types of original paper bundles are mixed, the user specifies by pressing a mixed key arranged on an operation panel of the copying machine body.

The specification of the thickness of one sheet of original paper is performed by pressing a thin paper key or a thick paper key arranged on the operation panel.

As described above, the original sheet bundle thickness and the original size are automatically detected by the respective sensors, and the mixed loading of the originals and the sheet thickness are manually set.

Based on the detected values and the manual setting, a pressing pulse table shown in Table 1 is set in advance.
The count B is determined by these sheet condition input means beforehand stored in a nonvolatile memory.

(7) Count B by the above designated pulse
Is input, and the count of the count B is started by driving the drive plate 118, and the drive plate 118 is swung until the designated count number B is counted up.
, The elastic force changes almost linearly, and the pressing force increases.

(8) When the count B counts up, the movable pressing plate 112 presses the original D against the feed belt 123 with a predetermined pressing force (for example, 100 g), and after the specified pressing force is completed, the pressing motor M1 Stop driving.

(9) Next, a drive motor (main motor)
M2 is turned on, and at the same time, the electromagnetic clutches CL1 and CL2
Is also turned on, and paper feeding is started.

That is, the upper-layer original D is sent out by the feed belt 123 which has started to rotate by the driving force of the motor M2, and the uppermost original D among the plurality of originals D sent out by the reverse roller 124. Only the sheets are separated and fed.

(10) The single separated document D fed is nip-conveyed to the intermediate conveyance roller 130, and when the leading end thereof crosses the document passage detection sensor PS5, the driving roller
The clutch CL1 that has been driving the 121 is turned off, and the feed belt 123 is driven to rotate until the trailing end of the document D passes through the sensor PS3, and then stops.

(11) Also, the original passage detection sensor PS
By turning on 5, the pressing motor M1 is switched to reverse rotation, and the driving plate 118 and the movable pressing plate 112 are lowered,
Release the pressure.

(12) When the home position detection sensor PS4 detects that the drive plate 118 has returned to the initial position, the pressing motor M1 is stopped.

(13) When the trailing edge of the first original D has passed and the original passage detection sensor PS5 is turned off, the pressing of the next original starts.

FIGS. 10A, 10B, and 10C are cross-sectional views of a main portion showing another embodiment of the sheet feeding apparatus according to the present invention. In the drawings, parts having the same functions as those of the above embodiment are denoted by the same reference numerals. Further, points different from the above embodiment will be described.

FIG. 10A shows a state in which a delivery roller 125, which is driven and rotated, is supported by a movable pressing plate 112 from above a document bundle D placed on a stack tray 110 so as to be swingable. The movable pressing member 112 holds a predetermined pressing force by the operation of a driving plate 118 oscillated by an oscillating shaft 114 driven by a pressing motor M1 and a torsion spring 119 in the same manner as described above. The upper surface of D is pressed. Only one original D is fed by the separating means 126 for preventing double feeding of the original D which has been fed upward by the rotation of the delivery roller 125 under pressure.

FIG. 10B shows a bottom feeder. Pressing means, which is provided above the stack tray 110 and includes a movable pressing plate 112, a driving plate 118, a torsion spring 119, and a swing shaft 114, presses the document bundle D with a predetermined pressing force. The lower feed roller 125 feeds the lower layer original of the original D and sends it to the separation means 126.

FIG. 10C also shows a bottom feeder. In this embodiment, the pressing means is located below and the movable pressing plate 112
The original on the bottom layer is sent out by a drive rotatable sending roller 125 provided at the leading end of the sheet, and the sheet advances to the separating means 126.

The pressing force by the pressing means described above can be automatically changed depending on conditions such as the document size, paper width, paper thickness, etc., so that the feeding is more stabilized. Further, the pressing force can be changed even by setting the specified conditions by the user. In these embodiments, the pressure is released by returning to the home position every time. However, the pressure may be released at all times until the original document runs out, or the release may be returned by a fixed amount.

[0054]

Since the sheet feeding device of the present invention is configured as described above, the following effects can be obtained.

Since the sheet pressing force when the sheet bundle placed on the stack tray is pressed and fed can be automatically changed according to the paper size, the paper thickness, the number of the paper bundle, and the like.
Sheet feeding can be stabilized.

Since the sheet pressing force can be changed in multiple stages,
Stable paper feeding is possible in all sheet conditions.

Even during high-speed sheet feeding, the sheet is stable without causing a feeding problem.

There is no need for a large-scale structure such as suction paper feeding, and there is no problem such as noise generation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an image recording apparatus to which a sheet feeding device of the present invention is applied.

FIG. 2 is a sectional view of the automatic document feeder according to the present invention.

FIG. 3 is a partial plan view of the automatic document feeder.

FIG. 4 is a schematic diagram showing a drive system of the automatic document feeder.

FIG. 5 is a cross-sectional view of a document placing section and a sheet feeding section of the automatic document feeder.

FIG. 6 is a cross-sectional view showing an operation process of a pressing unit of the sheet feeding device according to the present invention.

FIG. 7 is a cross-sectional view showing a state in which paper can be supplied by the paper supply device.

FIG. 8 is a flowchart showing a paper feeding operation process of the paper feeding device.

FIG. 9 is a timing chart of the sheet feeding device.

FIG. 10 is a sectional view of a main part showing another embodiment of the sheet feeding device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Copier main body 10 Automatic document feeder 11 Document placement part 110 Stack tray (document placement plate) 111 Width regulation plate 112 Movable pressing plate (movable pressing member) 114 Oscillating shaft 118 Driving plate (driving member) 118A, 118B Actuator section 119 Torsion spring (elastically deformable member) 12 Paper feed section 120 Document leading end stopper 121 Drive roller 123 Feed belt (feeding means) 124 Reverse roller 125 Feeding roller (feeding means) 126 Separating means 13 Transport section 130 First intermediate transport roller 132 Second intermediate transport roller 133 Drive roller 137 Transport belt 14 Discharge reversing unit 2 Scanning exposure optical system 21 Platen glass 3 Image forming unit 31 Photoconductor drum 4 Copy paper supply unit 41 Paper feed unit 9 Double-sided recording paper transport unit 91 Paper section A, B Pulse count D Document, document bundle M1 Pressing motor (drive means) M2 Drive motor (main motor) CL1, C L2 Electromagnetic clutch BRK brake PS1 Document set detection sensor PS2 Document size sensor PS3 Press detection sensor (first detection member) PS4 Home position detection sensor PS5 Document passage detection sensor (second detection member)

Claims (5)

(57) [Claims] 1. A stack tray (110) for stacking and supporting a plurality of sheets , and a part of the sheets stacked on the stack tray (110)
Feeding means (123) for feeding a sheet in contact with a sheet
And a sheet disposed close to the stack tray (110).
Support the sheet and feed the sheet to the feeding means (1).
23) a movable pressing member (112) for pressing the movable pressing member (112), and an elastic deformation member for urging the movable pressing member (112).
(119) and the movable pressing member via the elastic deformation member (119).
A driving member (118) for moving the (112); and a driving means (M1) for driving the driving member (118).
And the amount of deformation of the elastically deformable member (119) or the movable pressing
The relative position between the member (112) and the driving member (118) is detected.
A first detecting member (PS3) to be detected and a home position for detecting an initial position of the driving member (118).
A position detection sensor (PS4) and a control unit . The control unit is configured to control the initial state by the driving unit (M1).
Driving the driving member (118) in the position,
The movable pressing member (11) is inserted through a deformable member (119).
2) is moved and the product is placed on the movable pressing member (112).
The sheet bundle to be placed is pressed against the feeding means (123).
That the sheet bundle has been pressed against the sheet at the initial set pressure.
The detecting member (PS3) detects the initial position.
From the point when pressure contact with the initial set pressure is detected.
From the displacement amount of the moving member (118), the movable pressing member (11
2) Detecting the thickness of a bundle of sheets stacked on top
Paper feeder to be used. 2. A stack for stacking and supporting a plurality of sheets.
In contact with the lay (110) and a part of the sheets stacked on the stack tray.
A feeding means (125) for feeding a sheet, and a movable pressing member for supporting the feeding means (125)
(112) and an elastically deformable member for urging the movable pressing member (112)
(119) and the movable pressing member via the elastic deformation member (119).
(112) driving members Before moving the (118), drive means for driving the drive member (118) (M1)
And the amount of deformation of the elastically deformable member (119) or the movable pressing
The relative position between the member (112) and the driving member (118) is detected.
A first detecting member (PS3) to be detected and a home position for detecting an initial position of the driving member (118).
A position detection sensor (PS4) and a control unit . The control unit is configured to control the initial state by the driving unit (M1).
Driving the driving member (118) in the position,
The movable pressing member (11) is inserted through a deformable member (119).
2) Move and place on the stack tray (110)
The stack of sheets to be stacked is pressed by the delivery means (123).
The first detection unit detects that the contact has been made at the initial set pressure.
(PS3), and from the initial position,
The drive member until the pressure contact at the initial set pressure is detected
From the displacement of (118), the stack tray (110)
The feature is to detect the thickness of the sheet bundle loaded on top
Paper feeder. 3. The control means according to claim 2 , wherein
The feature of 8) is that the displacement is detected by pulse count.
The paper feeding device according to claim 1 or 2, wherein 4. The control device according to claim 1 , wherein the control means includes a first detecting member.
Information on the thickness of the sheet bundle detected by (PS3)
And sheet size information and sheet thickness information
The driving member (118) is determined by a pulse data table.
Control to press the sheet bundle against the feeding means (123).
After that, the feeding means is operated to feed paper.
The sheet feeding device according to claim 3, wherein: 5. The movable pressing member (112) and the drive
The member (118) is defined by the elastically deformable member (119).
And the movable pressing member (1
12) is a certain amount or more with respect to the driving member (118).
Claims characterized by not being opened
The sheet feeding device according to any one of claims 1 to 4.