JPS6023229A - Sheet feeder - Google Patents

Abstract

PURPOSE:To stably separate and feed sheets one by one by continuously rotating a sheet feed auxiliary roller plural times for feeding a sheet in each sheet feed cycle to ensure sufficient sheet feeding force. CONSTITUTION:A sheet feed auxiliary roller 13 faces to a sheet loading table 1 from the back side thereof to the upper surface side, and the outer periphery of the roller is provided with a portion 13c engaged with the lower surface of stacked sheets P for feeding the lowermost sheet to a separating and transporting mechanism 2 and a portion 13b not engaged with the lower surface of the stacked sheets P. In each sheet feed cycle, the sheet feed auxiliary roller 13 is continuously rotated until a fixed timer time is counted up, and a sheet feed belt and a separating belt 8 of the separating and transporting mechanism 2 are stopped to drive, and meanwhile, the rollr is continuously rotated plural times to reliably feed the lowermost sheet. Subsequently, when the last sheet is fed out and it is detected that the sheet is out, the non-engaging portion 13b of the roller 13 is faced to the upper surface side of the sheet loading table 1 to be on standby there.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sheet stacking table, a sheet Jjr.
ll The IF51 feeding mechanism acts on the loading surface of the sheet loading platform -1- to feed one sheet +'7 to the lowest sheet.
A, move the sheet feeding auxiliary roller that feeds the IG feeder 4*l' in the direction, and place the loaded and unloaded sheets on the sheet JJ'l loading table, one from the side. The present invention relates to a sheet feeding device that separates and conveys sheets.

Such sheet feeding devices are, for example, image forming devices such as duplex machines, facsimile transmitters, and
! The device automatically converts sheet documents one by one into originals (66
It is utilized as a dynamic feeding device (A, D, F device) for feeding sheets lj; I, document 1 to the illumination section and reading section. Also, automatic feeding devices for printing paper and duplicating paper in printing machines, duplicating machines, etc., paper feeding mechanisms for single-sided printed or copy-processed sheets in double-sided printing machines and double-sided copying machines, etc. It is also used as

In the sheet feeding device as described above, the present invention combines the drive control mode of the feeding auxiliary roller to control the sheet Kti
1- It is an object of the present invention to provide a sheet that can quickly set a sheet on a second cent stand without being disturbed by a sheet feeding auxiliary roller, and that can always continue a stable conveyance cycle of N1 for 1 sheet (1 = 1 sheet). 1 target.

The following is a basic explanation based on an embodiment shown in FIG.

In Fig. 1, numeral 1 is a sheet loading platform, and the leading end side, which is the sheet feeding side, is set at a low position, and the pre-loading is about 2O2! It is placed in the shoulder posture.

2 is a Sea I/1 autumn equinox NF transport mechanism that is connected to the tip side of the Seat t-Jrj mounting table 1, and there are various types of mechanisms. In this example, a combination of a sort feed belt I and a batch N1 belt is used.

That is, 3 is a sheet feeding belt suspended between rollers 4 and 5, and 6 and 7 are spindles of the rollers 4 and 5, respectively.
・5 is a big one-way Clara 5-4 to those support +11
It is taken through a.5a.

The support 11b 6 of the roller 4 is used as a drive shaft, and the rotation of this shaft causes the sheet feeding bell I/3 to move in the direction of the arrow 111.
'') The sheet feeding belt 3 is rotated in the direction Kl;
Multiple rows are arranged in parallel with a % spacing between them.

Rollers 9 and 10 are placed on the upper side of the sheet feeding belt 3.
Seat square belt stretched between, 11 and 12 are large 7
This is the support for the roller 9.lO.

The spindle 12 of the roller 10 is used as a drive Ihb, and this +
The sheet separation belt 8 is rotationally driven in the counterclockwise direction as indicated by the arrow by the rotation 11+. Also, this seat part 1?7t <
As shown in Figure 3, multiple routes 8 are arranged in parallel along the long length of the legs 11-12 at fJ-ini\\h intervals, and each seat i and separation bell l are arranged in parallel. -8 is disposed at a position corresponding to between the individual sheet feeding pels I on the F side. That is, the individual sheet feeding belts 3 and the individual sheet separating belts 8 are arranged in a plane position. In addition, the above-mentioned sheet feeding belt 3 and batch cutting bells I and 8 are located at the one side bell l-3a of the sheet feeding belt in contrast to the one side bell of the sheet floating belt. part 8
They are arranged so that the do faces of a are aligned with each other by about 1 mm.

Reference numeral 13 denotes a sheet feeding auxiliary roller which is arranged on the back side of the sheet loading platform 1 on the front side of the transport mechanism 2 (911) for one sheet, and feeds the sheet through the through hole 1a made on the surface of the sheet loading platform 1. It is facing towards the first side of the l. Reference numeral 14 denotes a rotational drive shaft of this roller. Several rollers 13 are mounted on this shaft via one-way clutches 13a, and are driven to rotate in the opposite direction of arrow 4.

Reference numeral 15 denotes a front end receiving regulation plate of the stacked sheets, which is arranged on the front side of the end 8 () on the sheet stacking platform 1 side of the sheet portion Nl Pel I-8, and 16 indicates the through hole 1a of the sorting stacking platform l] , sheet presser weights ft and I arranged in the horizontal position.
f, is a material and is free to swing downwards about the shaft 17. This weight member 16 is normally lifted and held by a tension spring 18 to the relief position on three sides about the shaft 17 as shown by the two-dot chain line in FIG. When this is done, the L' ridge rotates as shown by the solid line against the spring 18 and corresponds to the position of the sheet feeding auxiliary roller 13! Touch the V sheet'-face part, press the seam part moderately, and apply the front claw.

The automatic conveyance of one sheet N1 of the facing sheet I is performed as follows.

a. Sheets stacked on top of each other to be automatically conveyed 1-P
Place the bundle of sheets on the sheet stacking platform l'-, slide the stack of sheets forward along the front tilted shoulder surface of the sheet stacking platform l,
Place the east edge of the sheet on the sheet edge support 11. ．． It is reversed in that it is received on the front side of the alignment regulating plate 15.

Make it.

b. When a sheet feeding start signal is input to the control circuit, the solenoid 19 is energized, and the unit member 16 rotates downward to press the sheet east P (solid line 111 in Figure 1). .

C1 At approximately the same time, driving of the sheet feeding auxiliary roller 13, sheet feeding belt 3, and separating belt 8 is started.

d, J/J loading sheet on the sheet planting table 1 by rotation of the sheet feeding auxiliary roller 13!・Shi to P's lowest sheet P1,
-1.1 Autumn equinox sub-transport mechanism The sheet P1 is fed in two directions, and the sheet P1 is subjected to frictional drag with the table l, and the sheet P1 is fed in two directions.・J
2. The front moves against any frictional drag, and its tip side meets the lower side of the regulating plate 15 and the sheet loading table l or sea].
Passing through the gap 20 between the sheet feeding belt 3 and the -1- side belt portion 3a of the sheet feeding belt 3 and the sheet portion N [Do side '\rut portion 8a of the belt 8 enter in. At this time, there are multiple sheets P2 and P3 in the -1 of the lowest sheet P, which does not correspond to the above-mentioned 11th movement.
, , are also moved forward, and their leading edges also enter the nimp portion 21.

e.However, in the nip portion 21, the 1-side belt portion 3a of the sheet feeding belt 3 is moving in the sheet forward feeding direction, and the toe-side belt portion 8a of the sheet portion N1 heel 1-8 is on the contrary returning the sheet. Since it is moving in the direction, the tip of the tip entered the pump section 21 in
,・P3 , , the sheet P1 at the most t' position is in a relationship where the sheet I-++h+ moving in the feed direction is in contact with the root part 8a, and the sheet I- above it is in contact with the sheet P1.
P, 11P310. The tip of each is sealed.
- The part of the bell l moving in the reverse feeding direction comes into contact with the portion 8a. The result is the sheet P I
Pell 1. rzR minute 3 a ・8 a 1i
As it enters il, its -1, sea 1-P, ・P
.

1. 11-6 is blocked from entering, and as shown in the second figure, only one sheet of the lowest seal l'P+ is conveyed between the belt portions 3a and 8a.

f, the sheet l-P +, which has been reduced by one sheet in the heald portions 3a and 8a, is then transported
- Enters the sheet path 23 consisting of 22 and heads for the intermediate roller pair 241124. When the sheet P enters the sheet path 23, the light is 0 on the way to the intermediate roller pair 24 and 248;
Sheet path 2 of sheet P by blocking the optical path of sheet P,
3 entry is detected. The relay roller pair 24, 24 is not rotationally driven at this point, and 1. Sensor 5a-
The rotational drive is started after a predetermined timer 119 period Tl after the leading edge of the sheet is detected by 3b. This timer 1
1; During the interval T1, the leading edge of the sheet P1 reaches the nip portion of the intermediate roller pair 24, is received, and is transferred to the intermediate roller pair 24, 24, and one sheet #conveying mechanism 211
First, a sheet loop P (shown by a two-dot chain line in FIG. 2) having an amount of Jl is formed. 1- When the timer time T1 times up, the relay roller pair 24, 24 starts rotating, and the drive of the conveyance mechanism 2 for one sheet by one sheet [-feeding heald 3 and batch N[belt 8] is started. Stopped for 1L. Even when the driving of the belts 3 and 8 is stopped, the sheet P1 is drawn in and generally fed by the rotation of the relay roller pair 24 and 24. For mezzi-1-feeding pel l-3 that party, 141IIQ
Since the set rollers 4 and 5 are taken out via the one-way clutches 4a and 5a to the joint support +ll + 6ψ7, the sheet P1 is relayed until the rear end of the sheet 1 is removed between the belt portions 3a and 8a. Rotates as a result of conveyance movement.

The seat part and the heald 8 stop rotating.P, p3. , , and continue to enter between the belt portions 3a and 8a of those seats,
I read it.

g, C)・When the rear end side of Pl passes through the sensor 5a-3b position and the optical path is opened, from that point on) i! After the timer time has elapsed, the drive of the relay roller pair 24 is stopped. Within this timer time, the trailing edge of the sea 1-Pl finishes passing between the relay roller pair 24, 24.

h, sheet feeding auxiliary roller 13, sheet feeding bell I.3, batch level bell]・8 is the next sheet feeding star 1-
(Ji bow) 1 (, followed by il drive started, /+
The next sheet P2, which is ranked M1, is transported N1 by one sheet.

i. By repeating this sign 2, the stand 11. J.J.
The li loaded sheets P or 1 (later, they are dynamically conveyed one by one for N1 minutes).

By the way, the sheet feeding auxiliary roller 3 generally has a part of its circumference u'ii like the roller shown in the figure.
Using a roughly half-moon-shaped roller 1111', as shown in FIG. The surface and the road surface -1 or the "-" surface of the stand 1 are set at a position slightly lower than the "-" side of the stand 1, and when rotated, the roller circumferential surface 13C other than the cutting plane part 13b in 4- is removed from the through hole 1a to the stand as shown in the second figure. It is a related structure that protrudes slightly above the upper surface of l and rotates. and sheet 1
For 0 feed and 1 exclusive use, this roller 13 is rotated once by a clutch mechanism '73.
S is driven one rotation, and during this rotation, the roller circumferential surface 13c other than the cutting plane part 13b of the roller 13 comes into contact with the surface F of the sheet on the lowest sheet on table L, and the sheet is sent to the lowest sheet P1. Can be called. One rotation! , J-1
The '-face portion 13b is positioned at 11°'1 to the through hole 1a, and the state is in a standby state. ”-Removal plane portion 13 of roller 13
b is referred to as a non-engaging portion with respect to the sheet, and a portion b is referred to as a retaining portion with respect to the circumferential surface portion 13c.

In other words, the conventional sheet feeding auxiliary roller 13 is driven one rotation at a time in 4+f during sheet feeding, feeds the sheet P1 at the sheet engaging portion 13c, and returns the sheet non-engaging portion 13b to the position of the through hole 1a. This is a drive control type in which the roller 13 completes one revolution in a state in which the roller 13 is rotated and then waits.

In this way, during the first operation, the non-sheet engaging portion 13b of the sheet feeding auxiliary roller 13 is placed in the through hole 1a of the table 1 when setting the sheet bundle on the table 1; (56
As shown in the figure, the sheet engaging portion 1 of the roller 13 is inserted through the through hole 1a.
If 3c or 3c protrudes from the 4th side of table l, the leading edges of several sheets on the C side of the east side of the sheet will be caught in the protrusion, causing the problem to occur.
This is to eliminate the problem that the paper sheet is not cut or the leading end of the sheet is bent due to the snagging, resulting in failure to properly transport one molecule.

However, since the conventional sheet feeding auxiliary roller 13 is driven only once at the time of sheet feeding, as shown in -1 and 15,
For example, if a fairly large sheet of J11' is loaded on the board 11, and a large cardboard sheet I... (r! If there are stacked sheets, if the I'ik friction coefficient of the sheet is originally small, or if the sheets are stuck together, etc., the feeding roller 13
Under conditions where the sheet is likely to slip and rotate against the lowest sheet surface of the loaded sheet 1-P, the sheet conveying force is insufficient and one rotation of the roller is sufficient to move the lowest sheet P1 to the required position of the N1 conveying mechanism 2 for one sheet. Unable to reach 1 sheet, 1 sheet, 1 question, 1i1't "Natural/Stable 1) 1
tends to decrease.

Similarly, the present invention uses a roller having a non-engaging portion 13b with respect to the sheet as described above as the sheet feeding auxiliary roller 13, but it is difficult to control its drive! By devising the process, sheet loading and sheet sensing for several machines can be carried out quickly without being disturbed by the auxiliary rollers, and a sufficient feeding force is always applied to the lowest sheet P+. This makes it possible to ensure stable conveyance of N1 sheets.

(Always keep the top up by the beating sheet feeding auxiliary roller 13)
- To ensure the conveyance force, the 1-roller 13 should be continuously rotated several times during the 1' AA feed iσ.

Moreover, it is not necessary for the roller 13 to return the sheet non-engaging portion 13b to the position of the through hole 1a of the table 1 at the end of the sheet feeding operation, and finally the roller 13 returns to the position Jl'1 of the table 11-. After the last loaded sheet is sent out, the through hole 1a of the stand
It is enough if you keep it in the position. 2j L
, the engagement of the roller 13 with the sheet jH3/J) 13c is in a protruding shape from the 1st surface of the table 1, which is inconvenient because the sheet is placed on the table 11. This is because, after all sheets have been fed, the next sheet is loaded and set on the table 11.

Therefore, the present invention includes a sheet feeding auxiliary roller 13M.
The drive is controlled as described below. That is,
A sheet loading table, a mechanism disposed on the sheet feeding side of the sheet JJ'i loaded fr, and a mechanism for feeding the loaded sheets one by one from the side, and a mechanism for feeding the loaded sheets one by one from the side, and Facing the side, Sea IJJ" 1 Jj's Samurai,
Engage with the bottom surface of the seat and press it to the highest position.
A sheet feeding auxiliary roller whose outer periphery includes a part that feeds the sheet in the direction of the rigid conveyance mechanism and a part 81i that does not engage with the lower surface of the stacked sheets, and The sheet feeding auxiliary roller 111+ is continuously rotated multiple times to drive the sheet feeding auxiliary roller 1 on the sheet loading table 1. When the last sheet on the sheet stacking table is fed out and the sensor detects that there is no sheet, A sheet characterized by being configured to drive and control the roller so that the roller is rotated until the engaging portion of the circumferential surface of the roller faces the side of the sheet stacking table, and then stopped and stands by in that state. The main focus is on the feeding device.

In Figs. 1 and 2, Sc*Sd is a sensor that detects the presence or absence of a sheet P on the sheet stacking table l-, and in this example, the sheet feeding auxiliary roller 13 and the conveyance mechanism for one sheet are used. 2, transmission type sensors consisting of a light source and a light receiving element are disposed facing each other on the back side of the front edge reception regulating plate 15 of the stacked sheets and on the back side of the sheet stacking table l. The light from the light source Sc passes through a through hole 15a formed in the regulating plate 15→through hole 1b formed in the base 1, and enters the light receiving element 'Sd. If even one sheet i is present on table 1, the optical path is blocked and the presence of a sheet on table 1 is detected. Further, when the last sheet on the table 1 is fed and its trailing edge passes through the optical path section, the optical path is opened, thereby detecting that there is no more sheet on the table 12.

In FIG. 4, 25 is a cam disk which is provided on one end side of the drive shaft 14 of the sheet feeding auxiliary roller 13 and rotates together with the shaft, and 25a is a part of the circumferential surface of the cam disk. The fourth part 26 formed in the cam plate is a stationary microswitch in which the actuator 2.6a is always in contact with the circumferential surface of the cam plate. The microswitch 26 is held on when the actuator 26a is in contact with the circumferential surface of the cam disk 25, and turned off when the actuator 26a is in contact with the four portions 26a. The cam disk 25 has an actuator 26 of a microswitch 26 on its four parts 25a.
When a is in a depressed rotational angle posture, the non-engaging portion 13a of the sheet feeding auxiliary roller 13 is connected to the through hole 1a of the table 1.
The related configuration is in a rotational angular position exactly located at .

FIG. 5 shows an example of a drive control circuit for the sheet feeding auxiliary roller 13.

Then, the sheet P is loaded onto the table L.
Therefore, when the presence of a sheet is detected by the sensors Sc and Sd, the apparatus operates as in item bxi above, and the Sea 1-1 Autumn Equinox # conveyance cycle is repeated.

In this case, in each sheet feeding cycle, the sheet feeding auxiliary roller 13 is activated by the predetermined timer 1 described in Section 0.
ltlijl T1 has timed up and the sheet feeding belt 3 and separation belt 8 of the sheet 1-1 autumn N1 conveyance mechanism
It continues to be rotated until it stops, and during that time it rotates several times in succession.

Further, in each sheet feeding cycle, the cam disk 25 is also continuously rotated multiple times as the sheet feeding auxiliary roller 13 (1-) is continuously rotated multiple times, and the microswitch 26 is turned on and off repeatedly. However, under the condition that the presence of Senna Sc*Sd or Sea is continuously detected, the on/off signal does not interfere with the control circuit.

When the conveyance of one sheet of Scent Sea 1-P on J/i on platform 1-1- progresses sequentially and the last one sheet is fed,
The sheet feeding auxiliary roller 13 continues iB until the driving of the sheet feeding belt 3 and separation belt 8 of the transport mechanism stops for one sheet, as in the case of each previous sheet feeding cycle. During this period, the sheet feeding belt 3 and the separation belt 8 are rotated and rotated continuously several times, and the driving is stopped at the same time as the driving of the sheet feeding belt 3 and the separating belt 8 is stopped. and intermediate roller pair 24
-24, when the last sheet is pulled in and conveyed, the trailing edge of the sheet passes through the optical path section of the sensor Sc*Sd and the optical path is opened, and when no sheet is detected, the sheet is fed based on the signal. The feeding auxiliary roller]3 is rotated and driven. When the cam disk 25, which is not affected by this rotation, also rotates, the four parts 25a of the disk 25 are positioned corresponding to the actuator 26a of the microswitch 26, and the actuator 26a is depressed into the four parts 25a. This turns off the microswitch 26. Due to this off-belief, the movement of the pieces of the auxiliary roller 13 is stopped.1. (In other words, as mentioned above, the cam disk 25,
When the actuator 26a of the microswitch 26 is in the depressed rotational angle position in the fourth part 25a, the phantom seat of the sheet feeding auxiliary roller 13 (a related configuration in which the non-engaging part 13b is exactly located in the through hole 1a of the table 1) Because it is Nishide,
After the last sheet of the table 11- is fed, the sheet feeding auxiliary roller 13 finally reaches a state in which the sheet JI engaging portion 13b on its outer periphery is located in the through hole la of the table l, and then stops 1.
-Wait. In addition, the weight member 1G operates the solenoid 19 based on the sensor Sc and Sd's sea 1 I+ (detection signal 1).
The energization to is released, and the tension spring 18 rotates the lever to the escape position in the L direction.

The control circuit shown in FIG. 5 will be explained.

The sheet P is set on the right side of the sheet 11&, and the sheet Mi on the stand IJ2, so the optical path of the sensors 5c-5d is blocked 1j
Under the condition that liS is set, the circuit switch 3o is turned off. Under this condition, the one-shot switch SWI at the sheet feeding start point automatically or automatically moves to 1.
When the relay is turned on, its contact R is turned on.

The relay contact R2 is turned on and the first
When the Moke M1 starts operating, the sheet feeding belt, 3, 8, and 8 times feeding auxiliary roller 13 are rotated, and the lowest sheet of the stacked sheets on the sheet stacking table is moved to the 1st equinox. transported.

When the leading edge of the conveyed sheet is detected by the sensor 5cold, the first timer 31 is activated by the signal, and after a predetermined fixed time T1, the switch 3 is controlled by the timer.
1a is turned on and relay 31R operates 1'1. This relay 31R's f-1 movement gives 1 loop, 1. 'I, 3
1R1 (normally closed) and 31R2 (times) are turned off, turning off relay R and turning off the 17th motor M1. As a result, the driving of the belts 3 and 8 and the roller 13 is stopped. On the other hand, the relay contact 31R3 is turned on, the second moke M2 starts operating, and the relay roller pair 24, 24 is driven, and the sheet is drawn in and conveyed by the roller pair 24, 24.

When the rear end of the sheet is detected by the sensors 5c-5d, the signal activates the second bearer 32, and after a certain period of time ν, the switch 32a controlled by the timer is turned on, and the relay 32R is activated. do. Due to the operation of this relay 32H, relay contact 32R1 (normally closed) is turned off, and the
2 is stopped.

Thus, the sheet feeding star), the switch for reliable transmission, and the switch S
Each time the WI is turned on, the control circuit operates as shown in the figure "-" to actually transport one sheet 4i.

Then, when the last sheet is fed and the trailing edge passes through the center→no 5C-3d section and the optical path is opened, the circuit switch 30 is turned on, and the micro frame 26 → switch 30 →When the circuit of the first moke Ml is opened, the first moke M1 is driven, and the microswitch 26 is turned off in response to the actuator 26a of the microswitch 26 and the four parts 25a of the cam disk 250 II! At one point, the operation of the first mork M1 is stopped (1-).

G1 and G2 are Ann (Pagate).

Thus, the present invention has the following advantages: (1) Since the seal l-feeding auxiliary roller 13 is driven to rotate continuously multiple times in each sheet feeding cycle to feed the seal l, sufficient sheet conveying force is obtained by the roller 13. (can ensure a stable sea)
・】Autumn Equinox #1 type sending can be performed.

(2) Also, as the roller 13° is continuously rotated multiple times in each sheet feeding cycle, the roller 130 and the engagement portion 13
Due to the repeated contact of c and the non-contact of the sheet non-engaging portion 13b, the so-called handling effect of the stacked sheets is produced by the 1-1 vibration action of one stack of sheets, -1- Coupled with the effect of item (1), it is possible to carry out stable conveyance of one sheet.

(3) The same roller 13 is finally connected to the sheet J1 engaging portion 13 on the outer periphery after the last sheet on the table I is fed.
Since the roller b stops at the through hole 1a of the platform 1, the outer periphery of the roller 13 does not protrude to the north side of the platform 1. Therefore, the next sheet stacking/forming onto the table 11-1 is carried out by the sheet feeding auxiliary roller 13.
It can be done quickly without being disturbed.

[Brief explanation of the drawing]

The drawings show an embodiment of the sheet dregs feeding device of the present invention, and FIG. 1 is a side view of the state before feeding, FIG. 2 is a side view of the state after feeding has started, and FIG. is shown in Figure 2 Ill-Il
4 is a side view of the force 1 disk, FIG. 5 is an example of a control circuit, and FIG. 6 is a diagram showing a state in which a sheet is caught on a sheet feeding auxiliary roller. l is a sheet loading platform, 2 is a sheet separation conveyance mechanism, 13
1 is a sheet feeding auxiliary roller, and 16 is a weight member. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) Placed on the sheet feeding side of sheet planting and joining,
A board that transports the loaded sheets one by one from the side.
11, from the back side of the sheet bond/continuation to the top side, I + 71'l, sheet mounting table - 1.0jt1, engage with 1st position 1111, and place 1 piece of L mark sea I on the highest position seat). ? J A sheet feeding auxiliary roller that has a portion on its outer periphery that feeds it in the direction of the conveyance mechanism and a portion that does not engage with one stacked sheet, and sheet b Detects the presence or absence of sheets on the stacking table. Regarding the sensor and the sheet feeding auxiliary roller described in -J-. When feeding sheets, the sheet is rotated continuously multiple times to feed the lowest sheet of the Jj11 sheets on the sheet loading table.
・When the last sheet of paper is fed out and the J-2 sensor detects that there is no sheet, the roller is moved against the saw on its peripheral surface.・Ijjl 1 shi ≦ until it faces the top side of the loading platform, and in that state stop 1 - drive 1 to make it standby. It was configured to be controlled by II. A sheet feeding device 1' characterized by: