JPH0656282A - Paper feed device - Google Patents

Abstract

PURPOSE:To avoid the seizure of a motor and the breakage of a drive section by detecting the overcurrent flowing in the motor for shifting the sheets of the first storage section to the first storage section in a lump, and temporarily stopping the current to the motor. CONSTITUTION:A sheet storage section is constituted of the right tray 1 and the left tray 2, and the left tray 2 is provided with a mobile back fence 24 pressing the nearly center section of stacked sheets P to shift them toward the right tray 1 in a lump. The force of the back fence 24 to press the sheet bundle 2 is generated by the driving torque of a reversible shift motor 30. When a foreign object is mixed during the shift of the sheet bundle 2 and a current of a specified value or above flows in the motor 30, the information is fed to a CPU 41 from a comparator, a transistor 42 is turned off by the command from the CPU 41, and the excitation to the motor 30 is stopped. The seizure of the sheet shift motor 30 and the breakage of a shift drive section can be avoided.

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 of an image forming apparatus such as a copying machine, facsimile, printer or the like, and more particularly to a sheet feeding device suitable for large-volume sheet feeding.

[0002]

2. Description of the Related Art As a device related to a large-volume sheet feeding device, Japanese Laid-Open Patent Publication No. 56-7843 (1) substitutes a table for setting sheets by means of sheet transfer means (transfer pressing plate) fixed to the main body. The technique that is being used is shown,
Japanese Unexamined Patent Publication (2) discloses a technique for stacking and feeding a large amount of paper into one bundle, and Japanese Unexamined Patent Publication (Kokai) No. 3-56334 (3) discloses that a sub paper container is a screw screw fixed to the main paper container. A technique for driving connection is disclosed, and is disclosed in Japanese Patent Laid-Open No. 3-124.
Japanese Unexamined Patent Publication No. 3-195639 (5) discloses a technique in which a sub-sheet container is drivingly connected to a screw screw fixed to the main sheet container. A possible technique is disclosed, and Japanese Patent Laid-Open No. 3-2
No. 23031 (6) discloses a technique in which a conveying belt for transferring a sheet bundle is stretched from a sub-sheet accommodating section to a main sheet accommodating section, and an operator is disclosed in JP-A-3-232629 (7). Discloses a technique for pulling out two empty sheet storage units. In Japanese Patent Laid-Open No. 4-28634 (8), a sub-sheet storage unit is hung from a main sheet storage unit and a conveyance belt for transferring a sheet bundle is stretched. Japanese Patent Application Laid-Open No. 4-28635 (9) discloses a technique in which a conveying belt for transferring a bundle of sheets is stretched from a sub sheet accommodating section to a main sheet accommodating section. JP-A-4-4502
Japanese Unexamined Patent Publication No. 2 (10) discloses a technique in which a transfer belt is installed in each of the sub paper storage unit and the main paper storage unit.

[0003]

The technique shown in (1) is
Since the table for setting the paper is replaced by the paper transfer means (transfer pressing plate) fixedly installed in the main body, when the paper is set, the operator sets the paper in the main body 100 as shown in FIG. It is necessary to insert the sheet up to the top of the sheet transfer means 101, and there is a drawback that the sheet replenishment performance is extremely poor. In the technique shown in (2), since a large amount of sheets are stacked and fed in one bundle, the sheet becomes long in the vertical direction, so that the sheet storage section cannot be arranged in the main body and a large space is provided beside the main body. There was a necessary defect. Further, in order to load a sheet with this feed device, it is necessary to temporarily stop the sheet feeding operation and further lower the elevator tray section to secure a supply space. Therefore, there is a drawback that productivity cannot be achieved because continuous feeding cannot be performed. In the techniques shown in (3) and (4), since the sub-sheet container is drivingly connected to the screw screw fixedly mounted on the main sheet container, the sub-sheet container must be loaded with paper in these containers. It is necessary to pull out the main paper container including the. Therefore, it is impossible to load the paper in the sub paper container while the paper in the main paper container is being fed. That is, since the paper feeding operation is temporarily stopped to load the paper, continuous feeding cannot be performed and the productivity is deteriorated. In the technique shown in (5), only the sub-sheet accommodating section can be pulled out, so when all the sheets are used up, the sheet is set once in the sub-sheet accommodating section and waits until the sheet moves to the main sheet accommodating section. Then load the paper again by reloading the paper. That is, there is a drawback that the sheets cannot be fully loaded in one sheet loading operation. In the techniques shown in (6), (8), and (9), since the transport belt for transporting a bundle of sheets is stretched from the sub sheet storage section to the main sheet storage section, it is necessary to load sheets. It is necessary to temporarily stop the paper feeding operation and pull out the entire tray. That is, there is a drawback that productivity cannot be achieved because continuous feeding cannot be performed.
The technique shown in (7) is troublesome because the operator pulls out the two empty sheet storage units, which requires two pulling operations.

Further, in both (5) and (7), if foreign matter or the like is present in the transport path while transporting the paper, the transportable loading platform collides with the foreign matter and stops, but there is no safety device. The power supply to the motor is not stopped. Therefore, there is a problem such as burning of the motor or damage to the drive system.

Further, if the operator mistakenly turns off the power of the machine during the transfer of the sheet, the stacking base stops over the main sheet storage section and the sub sheet storage section, and the sheet storage section as shown in (7). The locking means of is also released. If you pull out one of the paper compartments in that state, the stacking stand that is stopped midway will be caught, making it impossible to pull out the paper. , Damage the loading platform. In the technique shown in (10), a transfer belt is installed in each of the sub paper storage unit and the main paper storage unit. However, since both transfer units are arranged in the large tray, it is easy to load paper. Needs to temporarily stop the paper feeding operation and pull out the tray. That is, there is a drawback that productivity cannot be achieved because continuous feeding cannot be performed.

The present invention solves the above-mentioned drawbacks of the conventional apparatus and is thin so that it can be installed in the main body, and can cope with erroneous operation by an operator such as mixing of foreign matter into the paper storage section or stopping of the power supply during paper transfer. It is an object to provide a paper device.

[0007]

The above-mentioned object is to provide a first sheet accommodating section for accommodating a plurality of sheets, a sheet feeding section for feeding the sheets one by one from the first sheet accommodating section, and the first sheet accommodating section. A sheet feeding device having a second sheet storage section arranged horizontally and in parallel with the sheet storage section, and sheet transfer means for collectively transporting the sheets of the second sheet storage section to the first sheet storage section. In the above, the drive source of the sheet transporting means is constituted by a motor capable of rotating in the forward and reverse directions, and an overcurrent detecting means for detecting an overcurrent flowing in the motor, and an overcurrent is applied to the motor by the overcurrent detecting means. This is achieved by the first means provided with a control means for controlling to temporarily stop the supply of the electric current to the motor when the flow is detected.

[0008] Further, the above object is to provide a first sheet accommodating section for accommodating a plurality of sheets, sheet feeding means for feeding the sheets one by one from the first sheet accommodating section, and the first sheet accommodating section. And a second sheet storage section arranged horizontally and in parallel with each other.
In a sheet feeding device having a sheet transfer means for collectively transferring the sheets in the sheet storage section to the first sheet storage section, the drive source of the sheet transfer section is composed of a motor capable of rotating in forward and reverse directions, and This is achieved by the second means including two systems of drive transmission means having different reduction ratios for transmitting the driving force to the sheet transfer means, and drive connection / disconnection means capable of connecting / disconnecting the drive to / from each drive transmission means.

Further, the above object is to provide a first sheet accommodating portion for accommodating a plurality of sheets, sheet feeding means for feeding the sheets one by one from the first sheet accommodating portion, and the first sheet accommodating portion. And a second sheet storage section arranged horizontally and in parallel with each other.
In a sheet feeding device having a sheet transfer means for collectively transferring the sheets in the sheet storage section to the first sheet storage section, the drive source of the sheet transfer section is composed of a motor capable of rotating in the forward and reverse directions, and the motor is An overcurrent detecting means for detecting an overcurrent flowing therethrough, and a control means for controlling to temporarily stop the supply of the current to the motor when the overcurrent detecting means detects that an overcurrent flows in the motor. , A drive transmission means of two systems having different reduction ratios for transmitting the driving force of the motor to the sheet transfer means, and a drive connection / disconnection means capable of connecting / disconnecting the drive to the respective drive transmission means, and usually a drive ratio of The drive disconnecting means is controlled to use the smaller drive transmitting means, and when the overcurrent is detected by the overcurrent detecting means, the drive disconnecting means is controlled to use the drive transmitting means having the larger reduction ratio. It is achieved by the means.

[0010]

In the first means, the overcurrent detecting means can detect the mixture of foreign matter in the sheet transfer, so that the burn-in of the sheet transfer motor and the damage of the transfer drive section can be avoided.

In the second means, the drive transmission means and the drive connection / disconnection means having different reduction ratios quickly carry out the sheet transfer by the driving means having a low reduction ratio during the transfer of the normal sheet bundle, thereby eliminating the skewed sheet bundle. At the time of transportation, the sheet is reliably transported by the driving means having a high reduction ratio.

In the third means, the control means can determine whether the foreign matter is mixed or the skew of the sheet bundle is discriminated. Therefore, when the foreign matter is mixed, the sheet transfer is stopped, and when the sheet bundle is skewed, the sheet transfer is surely performed. Carry out.

[0013]

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

FIG. 1 is a schematic configuration diagram of a copying machine to which the present invention is applied, FIG. 2 is a top view of a sheet feeding device according to an embodiment of the present invention,
FIG. 3 is a front view of the same.

The paper feed section in FIG. 1 is of a two-stage paper feed type, that is, an upper stage a and a lower stage b. A conventional tray 3 for accommodating large-sized paper (about 500 sheets) such as A3 is supported by a rail 7 on the lower stage b so that it can be pulled out to the front side of the paper.

The upper stage a is an example of a sheet feeding device using the present invention. The sheet storage unit can store a small number of sheets of A4 or the like in the right tray 1 and the left tray 2 in the lateral direction, 500 sheets in total in a lateral direction of 1000 sheets. The shape of the left and right trays is a box in which the walls of the trays serving as the transfer passages are opened so that the sheets stacked on the left can be transferred to the right. Further, the left and right trays 1 and 2 are supported by rails 4, 5, and 6 so that they can be pulled out to the front side of the drawing.

2 and 3, a handle 2-1 is attached to the front surface of the left tray 2, and the handle 2-1 is used when the tray is pulled out. A paper take-out device 8 is provided at the front edge of the right tray 1 on the conveying side. In the paper take-out device 8, 9 is a pick-up roller that presses the stacked paper P1 and sends the paper P1 out of the accommodating section.
Denoted at 10 and 11 are separation rollers for separating and feeding the sheets P1 one by one. Further, the right tray 1 is provided with a pair of side fences 12 and 13 for positioning the sheet P1, back fences 14 and 15, and a bottom plate 16 on which the sheet P1 is stacked.

FIG. 4 is a perspective view near the side fence. The side fence 12 is shown here, but the side fence 13 is also the same.

The back fence 14, which is swingably supported around a fulcrum 12-1 arranged in a part of the side fence 12, is biased counterclockwise by a torsion spring 17. The bias fence 14 in the energized state regulates the trailing edge of the sheet. 18 is a rotary solenoid supported on the bottom of the side fence 12,
The pin 18-2 supported by -1 is electromagnetically rotated by a certain angle, and the torque causes the back fence 14 to rotate against the biasing force of the torsion spring 17 to instantly secure a sheet transfer area. . Further, when the energization is stopped, the pin 18-2 returns to the initial position by the return spring (not shown) inside the rotary solenoid 18, and the back fence 14
Also returns to the position where the trailing edge of the paper is regulated.

Below the bottom plate 16, there is provided a lifting device 19 which presses the bottom plate 16 and urges it toward the paper feed roller.

FIG. 5 is a block diagram of the drive unit of the bottom plate lifting device.

A sector gear 19-2 fixed to the shaft end of the pressure shaft 19-1 is driven by a bottom plate raising motor 19-3 capable of rotating in the forward and reverse directions. Support the pressure shaft 19-1 below the tray base,
A pressure plate 19-4 (FIGS. 2 and 3) is installed on the other shaft end. When the pressure shaft 19-1 rotates in the clockwise direction, the pressure plate 19-4 lifts the bottom plate 16 from below over the hole 20 (FIG. 2) on the tray stand.
Is urged upward, and the uppermost sheet comes into contact with the pick-up roller 9 (note that a rise detection sensor 9-1 (FIG. 3) for detecting the height of the uppermost sheet may be provided if necessary).

Reference numeral 21 in FIG. 3 is a pressure plate 19-4.
Is a descent detection sensor that detects that the descent to a position where it does not contact the bottom plate 16. 22 is the paper P1 in the right tray 1
A paper empty detection sensor that detects the presence or absence of
When there is no sheet P1 on the right tray 1, the filler portion of the empty detection sensor 22 is the cutout portion 16-1 of the bottom plate 16.
It is detected that there is no sheet P1 by falling into (FIG. 2).

The right tray 1 is provided with a locking mechanism pivotally supported by the tray.

FIG. 6 is a block diagram of the tray lock mechanism.

A lock claw 32 is rotatably provided around a shaft 32-1 fixedly mounted on the right tray 1 as a fulcrum. The lock claw 32 is constantly urged clockwise by a torsion spring 32-3. Therefore, the lock hole 2- of the left tray 2
Since the lock claw 32 is held so that the front end 32-2 of the lock claw 32 fits in 3, the right tray 1 can be integrally pulled out by pulling the left tray 2. However, when the lock release solenoid 31 supported by the main body is actuated, the tensioning force of the solenoid 31 resists the spring force of the return spring 31-1 to rotate the release lever 31-2 to the position shown by the dotted line in the figure. Let Therefore, since the tip end 32-2 of the lock claw 32 is released from the lock hole 2-3 of the left tray 2, even if the left tray 2 is pulled, the pulling force does not work on the right tray 1.

FIG. 7 is a block diagram of the tray lock mechanism.
More specifically, it is a detailed view of the locking mechanism when the left tray 2 is housed in the main body when the release solenoid 31 is inactive.

The edge portion 2-4 of the left tray 2 and the locking claw 3
As shown in the figure, the tip ends 32-2 of 2 are cam-shaped, so that the lock claw 32 rotates counterclockwise against the force of the torsion spring 32-3 to allow the left tray 2 to enter. To do.

A bottom plate 23 for loading sheets P2 is provided on the left tray 2 in FIG. 3, and a movable back fence 24 for pressing the substantially central portion of the loaded sheets P2 and transferring them all at once in the right tray 1 direction. To provide. The required pressing force is
In the experiment, 500 A4 sheets have a weight of about 800 gf.

The movable back fence 24 is movable in the paper transport direction along a guide member (not shown) fixedly mounted on the left tray 2.

The bottom plate 23 and the lifting bottom plate 16 have smooth surfaces so that the bundle of sheets can be easily slid and transferred, and ribs and beads are provided to reduce the conveyance resistance.
Further, the bottom plate 23 is fixed to the left tray 2 and further has a hole 23-1 on the bottom plate so that the pressing portion 24-1 of the movable back fence 24 can be moved. Since the pressing portion 24-1 is protruded below the bottom plate 23 to the transfer direction side with respect to the connecting portion 24-2 with the wire (which may be a timing belt) 25, the paper P2 can be transferred to the position P1.

The wire 25 connected to the movable back fence 24 has pulleys 26, 27 and 2 as shown in FIG.
The movable back wing 24 is reciprocated by rotating the pulley 27 forward and backward freely by a transfer motor 30 which is stretched between 8 and 29 and is capable of forward and reverse rotation. For the positioning of the reciprocating motion, the movable back fence 24 is provided with a projecting piece 24-3, and the projecting piece 24-3 is attached to the home sensor 47.
Is detected by the positioning sensor 48.

In FIG. 2 and FIG. 3, 33 is a sheet bundle detecting sensor.

The force with which the back fence 24 presses the sheet bundle P2 is generated by the drive torque of the transfer motor 30. However, when a large load force is generated by the driving torque of the transfer motor 30 due to the inclusion of foreign matter in the sheet bundle P2 during transfer, the transfer motor 30 is locked and stopped. If left in this state, the transfer motor 30
Overcurrent will flow inside and burn-in will occur.

FIG. 10 is a block diagram of the motor control circuit.

In the circuit shown in this figure, the transfer motor 3
Control 0. That is, when a current of a specified amount or more flows through the transfer motor 30, the comparator 40 causes the CPU 41 to operate.
The information is sent to the CPU, and the transistor 42 is turned off in response to a command from the CPU 41 to stop the power supply to the transfer motor 30. FIG. 10 shows a circuit that stops the transfer motor 30 when a current of 0.7 A, for example, flows.

FIG. 11 is an explanatory diagram showing the characteristics of the motor.

It is assumed that the transfer motor 30 is used at a rotation speed of 1500 rpm in order to satisfy the spec of "the moving distance of the back wing 24 is 250 mm, the transfer time is within 3 seconds, and the required pressing pressure of the back wing 24 is 800 gf". Hereinafter, the expected reduction ratio and transfer time required for designing the drive unit are calculated (the gear efficiency is not taken into consideration here, but is calculated at the time of actual design).

Reduction ratio = required pushing pressure / (motor torque /
Pulley radius) = 800 gf ÷ 50 gf = 16 (provided that the pulley radius is 1 cm) Transfer speed = (output pulley circumference × revolutions) ÷ (60 × reduction ratio) = 20π × 1500/60 × 16 = 98 mm / se
c Transfer time = moving distance / transfer speed = 250/98 =
2.5 sec Here, assuming that the above-mentioned circuit is used, the load force on the back fence 24 is 1200 gf (at 0.7 A).
At that time, the transfer motor 30 is stopped.

As described above, since the transfer motor 30 does not lock due to the inclusion of foreign matter, there is no fear of seizure of the transfer motor 30. However, when the sheet bundle is skewed and comes into strong contact with the side fences 12 and 13 during the transportation of the sheet bundle, the sheet bundle advances slowly and the load force is 1
It may be 200 gf. In this case, if the motor 30 is simply stopped by the above-mentioned circuit, it may cause a jam during transfer even though there is no foreign matter on the tray.

Therefore, as shown in FIG. 12, the drive path from the transfer motor 30 to the wire 25 is a drive mechanism having two systems with different reduction ratios. The reduction ratios of the first and second drive paths are set to 16 and 24, respectively, and the clutches 50 and 51 are provided on both drive paths. Normally, the first clutch 50 is turned on and the second clutch 51 is turned off so that the drive is transmitted through the first drive path. Then, after detecting the load force of 1200 gf and stopping the forward / reverse rotation motor 30, the first clutch 50 is turned off and the second clutch 5 is turned off.
Turn 1 on.

Therefore, since the safety device does not operate up to the load force of 1800 gf, even a bundle of skewed sheets can be transported. If foreign matter is mixed in, the load force will be 180
Since it becomes 0 gf or more, the safety device is activated and the transfer motor 30 is stopped. Therefore, the jam being transferred is displayed on the display unit to prompt the operator to perform the jam processing.

From the beginning, if the second drive path is used, the skew of the sheet bundle does not occur, but since the drive path with a large reduction ratio is used, the sheet bundle transfer time becomes long. Therefore, in the normal case, the first route having a short transfer time is used.

Next, the control contents of the present invention will be explained based on the flow chart of FIG.

When the start signal is input, the bottom plate lifting motor 19-3 starts forward rotation (S1). When the rise detection sensor 9-1 detects the completion of the rise (Y in S22), the motor 19-3 stops (S3). Then, if it is confirmed by the empty detection sensor 22 that the right tray 1 has paper remaining (Yes in S4), the paper feeding operation is started (S5). However, if it is detected that the paper has been consumed and becomes empty (no in S4), and further, if the paper stack detection sensor 33 detects that there is paper in the left tray 2 at this time (Yes in S6), The bottom plate lifting device 19 is commanded to reverse the bottom plate lifting motor 19-3 (S7), and the bottom plate 16 is returned to the release position. Then, the back fence 14, 1 of the right tray 1
5 is retracted from the paper bundle transfer path (rotary solenoid 18 is turned on) (Y in S8, S9, S10). Next, after activating the first drive path (the first clutch 50 is turned on) (S
11) and drives the movable back fence 24 (S1
2) The sheet bundle P2 is transferred to the right tray 1. Before the sheet transfer is completed (N in S13), if it is detected that the load force is 1200 gf or more by the above circuit (S14).
Then, the transfer motor 30 is stopped once (S1).
5) The second drive path is operated (S16), and the movement of the sheet bundle is started again (S17). Here, when the transfer motor 30 is stopped when the first drive path is switched to the second drive path, there is no problem even if the drive path is switched while the transfer motor 30 is rotated. Then, before the transfer is completed (N in S18), when the load force becomes 1800 gf or more (N in S19), the transfer motor 30 is stopped as a jam during transfer (S20), and a jam is displayed (S21).

When the end of transfer of the sheet bundle is detected (Y in S13 and Y in S18), the movable back fence 24 is returned to the home position (detected by the home sensor 47) (S2).
2, S23, Y in S24, S25), the paper empty of the left tray 2 is displayed on the operation unit or the like to prompt the operator to replenish the paper.

In the right tray 1, after the bundle of sheets is transferred, the back edges of the bundle of sheets are regulated by returning the back fences 14 and 15 to the return positions (rotary solenoid 18 is off) (S26), and then the bottom plate 16 is predetermined. And the paper feeding operation is carried out (Y in S27, S28, S29, S3).
0). Once the paper feeding operation is started, the lock release solenoid 31
Is turned on (S31), and the locks on the left and right trays are released. Therefore, when the operator notices the paper empty of the left tray 2 during the paper feeding operation and pulls the handle 2-1 toward the front to replenish the paper, only the left tray 2 is pulled out to the front as shown in FIG. I can do it. That is, since the left tray 2 is in the front, the optor can easily replenish the paper, and the paper feeding operation in the right tray 1 is performed during the replenishment of the paper, so that there is no time loss.

Further, when the operator pulls the grip 2-1 toward the front when the left and right trays are used up or when the power is off, the lock release solenoid 31 as shown in FIG.
Does not work, the left and right trays are integrated and pulled out to the front, and a total of 1000 sheets can be replenished by one pulling operation. Similarly, even if the operator mistakenly turns off the power during the sheet transfer operation and pulls out the tray in this state, the lock release solenoid 31 does not operate. That is, even if the sheets being transferred are stopped in a state of straddling the left and right trays, there is no damage to the sheet bundle and the sheet transfer drive unit due to the tray pulling operation. When the paper feeding operation is completed (S32), the lock release solenoid 31 is turned off (S
33).

[0049]

According to the first aspect of the present invention, the overcurrent detecting means can detect the mixing of the foreign matter during the sheet transfer, so that the burn-in of the sheet transfer motor and the damage of the transfer drive section can be avoided. it can.

According to the second aspect of the present invention, the drive transmission means and the drive connection / disconnection means having different reduction ratios perform the sheet transfer quickly by the driving means having a low reduction ratio during normal sheet bundle transfer. When the sheet bundle is transported, the sheet can be reliably transported by the driving unit having a high reduction ratio.

According to the third aspect of the present invention, the control means can determine whether the foreign matter is mixed or the sheet bundle is skewed. Therefore, when the foreign matter is mixed, the sheet transfer is stopped, and when the sheet bundle is skewed, the control is surely performed. Paper transfer can be performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a copying machine to which the present invention is applied.

FIG. 2 is a top view of the sheet feeding device according to the embodiment of the present invention.

FIG. 3 is a front view of the sheet feeding device according to the embodiment of the present invention.

FIG. 4 is a perspective view near a side fence.

FIG. 5 is a configuration diagram of a drive unit of the bottom plate lifting device.

FIG. 6 is a configuration diagram of a tray lock mechanism.

FIG. 7 is a configuration diagram of a tray lock mechanism.

FIG. 8 is a plan view of the tray when the handle is pulled toward the front while the tray is unlocked.

FIG. 9 is a plan view of the tray when the handle is pulled toward the front in the locked state of the tray.

FIG. 10 is a block diagram of a motor control circuit.

FIG. 11 is an explanatory diagram showing characteristics of a motor.

FIG. 12 is a perspective view of a two-system drive transmission unit.

FIG. 13 is a flow chart showing the control contents of the present invention.

FIG. 14 is a perspective view of a sheet feeding device according to a conventional example.

[Explanation of symbols]

 1 Right Tray (First Paper Storage Unit) 2 Left Tray (Second Paper Storage Unit) 4, 5, 6 Rails 8 Paper Extracting Device (Paper Feeding Unit) 9 Pickup Roller 10, 11 Separation Roller 12, 13 Side Fence 14, 15 back-fence 24 movable back-fence (paper transfer means) 30 transfer motor (drive source) 40 comparator (overcurrent detection means) 41 CPU (control means)

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[Procedure amendment]

[Submission date] March 12, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 10]

FIG. 11

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Fig. 12]

FIG. 14

[Fig. 13]

Claims (3)

[Claims] 1. A first sheet accommodating portion for stacking a plurality of sheets, a sheet feeding means for feeding the sheets one by one from the first sheet accommodating portion, A sheet feeding device having a second sheet storage section arranged in parallel and a sheet transfer section for collectively transferring the sheets of the second sheet storage section to the first sheet storage section, in which the sheet transfer section is driven. The source is constituted by a motor capable of rotating in the forward and reverse directions, and an overcurrent detecting means for detecting an overcurrent flowing through the motor, and when the overcurrent detecting means detects that an overcurrent flows through the motor, A sheet feeding device, comprising: a control unit that controls to temporarily stop the supply of current to the motor. 2. A first sheet accommodating portion for stacking a plurality of sheets, a sheet feeding unit for feeding the sheets one by one from the first sheet accommodating portion, A sheet feeding device having a second sheet storage section arranged in parallel and a sheet transfer section for collectively transferring the sheets of the second sheet storage section to the first sheet storage section, in which the sheet transfer section is driven. The source is constituted by a motor capable of rotating in the forward and reverse directions, and two systems of drive transmission means having different reduction ratios for transmitting the driving force of the motor to the sheet transfer means, and the drive can be intermittently connected to each drive transmission means. A sheet feeding device comprising a drive connecting / disconnecting means. 3. A first sheet accommodating portion for stacking a plurality of sheets, a sheet feeding unit for feeding the sheets one by one from the first sheet accommodating portion, A sheet feeding device having a second sheet storage section arranged in parallel and a sheet transfer section for collectively transferring the sheets of the second sheet storage section to the first sheet storage section, in which the sheet transfer section is driven. The source is constituted by a motor capable of rotating in the forward and reverse directions, and an overcurrent detecting means for detecting an overcurrent flowing through the motor, and when the overcurrent detecting means detects that an overcurrent flows through the motor, The control means for controlling to temporarily stop the supply of the electric current to the motor, the drive transmission means of two systems having different reduction ratios for transmitting the drive force of the motor to the sheet transfer means, and the respective drive transmission means Equipped with a drive connection and disconnection means that can connect and disconnect the drive, Normally, the drive disconnecting means is controlled to use the drive transmitting means with the smaller reduction ratio, and when the overcurrent is detected by the overcurrent detecting means, the drive disconnecting means is used to use the drive transmitting means with the larger reduction ratio. A paper feeding device characterized by controlling a means.