JPH07115770B2 - Sheet feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped material supplying apparatus provided in, for example, a copying machine or a printer, and more specifically, a stacked sheet-shaped material is located at the uppermost position. The present invention relates to a sheet-shaped material supply device capable of supplying one sheet at a time from the beginning and detecting the completion of supply of the sheet-shaped material.

2. Description of the Related Art In recent years, in electrostatic copiers and the like, sheet-shaped originals of the same size and copy number are automatically conveyed one by one to a reading position to perform optical scanning of the originals to read and expose original images. There is a tendency that a circulation type document feeder for performing the above is provided.

The sheet-shaped originals to be copied are stacked and stored in a document storage section of the document supply device. When the copying operation starts, the originals are automatically fed from the original storage section one by one,
The document is conveyed to a document conveyance path having a reading position. In the conventional circulation type document feeder, the document for which the operation of presenting the document image at the reading position is completed is returned to the document storing section again and is stored, for example, separately from the document which has not been fed. In order to automatically copy one set of a plurality of originals, all the originals stacked and stored in the original storage section are fed to the original conveying path for the reading / exposure operation. It is necessary to have a detection means for detecting the above-mentioned state, and for this purpose, a detection device for detecting the above-mentioned state is provided.

FIG. 8 is a simplified sectional view showing a first conventional example. The detection device 1 for detecting the completion of feeding the originals is arranged in the vicinity of the original storage unit 5 in which a plurality of sheet-shaped originals d are stacked and stored. The detection device 1 is configured to include a detection unit 2 in which a light emitting element and a light receiving element are integrally provided, and an operation member 4 in which a mirror surface 3 that reflects light from the detection unit 2 is partially provided. . That is, the light emitting element of the detection unit 2 emits light to the operation member 4 provided below the detection unit 2 in FIG. When this light is reflected by the mirror surface 3 of the operation member 4 and is received by the light receiving element of the detection unit 2, it is detected that the original document d is completely fed.

When the documents d are stacked and stored in the document storage unit 5, the operating member 4 of the detection device 1 is arranged below the documents located at the bottom of the stacked documents d. When a copying operation or the like is started, the stored originals d are fed from the original storage 5 to the right side in FIG. 8 in order from the topmost one. When the reading and exposing operation for the fed original is completed, the taken original is returned to the original storage unit 5 again from the lower side. The document stored at this time is returned by inserting the downstream end of the document in the storage direction into the lower side of the operating member 4.

When the documents d stacked in this way are fed one by one in order from the one located at the uppermost position and then again stored one by one at the lowermost part, such feeding and re-saving The operation member 4 is gradually pushed upward in the drawing in accordance with the operation of. The light emitted from the detection unit 2 downward in the drawing is blocked by the unfed original document d on the operating member 4, if any. When the document d is fed and the last document is fed, the mirror surface 3 of the actuating member 4 is exposed and faces the detection unit 2, whereby light is reflected to the detection unit 2 and one set of plural sheets is reflected. The completion of feeding the document d is detected.

In the first conventional example, the detection unit 2 including the light emitting element and the light receiving element as the detection device 1 is separated to a position facing each other when the document d stored in the document storage unit 5 does not exist on the operating member 4. Need to be provided. Therefore, the number of parts increases, the occupied volume for detecting the document feeding state is large, and the space utilization efficiency decreases.

FIG. 9 is a simplified cross-sectional view showing a second conventional example. The operating member 4 is rotatably supported by the machine body 9, and a spring 7 is fixed to the machine body 9 at one end 4b thereof.
The other end 4a, which comes into contact with the document d stored in the document storage 5 from below, is spring-biased upward. In the vicinity of the actuating member 4, a light receiving element 8 for receiving light from a light emitting element (not shown) provided vertically above the paper surface of FIG.

When the documents d are stacked and stored in the document storage section 5, the other end 4a of the operating member 4 comes into contact with the document located at the bottom of the stored documents d from the lower side. Similar to the first conventional example, when the document d is fed from the document storage unit 5 in the order from the uppermost one and returned to the lowermost part again, the downstream end of the original stored in the storage direction is , Is inserted below the other end 4a of the operating member 4. As a result, the other end 4a of the operating member 4 is gradually displaced upward by the spring 7 in association with the feeding and re-storing operation of the document d, so that one end of the operating member 4 is moved.
4b is displaced in the opposite direction to the other end 4a. When all the unfed originals stored in the original storage section 5 divided by the operating member 4 are supplied, one end 4b of the operating member 4 passes through the path of the light received by the light receiving element 8 from the light emitting element (not shown). It is cut off, and it is detected that the entire document d has been fed.

In the second conventional example, when the weight of the original document d is light, or when the number of unfed original documents divided by the operating member 4 is small, the force of the spring 7 causes the other members of the operating member 4 to move. It is likely that the end 4a pushes up an unfed original and is angularly displaced, and the end 4b of the operating member 4 blocks the optical path of the light receiving element 8. In this case, a detection signal indicating that all the documents d have been fed is derived even though all the documents d have not been fed, resulting in a malfunction.

FIG. 10 is a diagram showing a third conventional example disclosed in US Pat. No. 4639126, and FIG. 11 is a diagram for explaining the operation thereof. The following finger, which moves from the lower side with respect to the stack 39 of originals supplied for copying, is configured to include a lightweight and small coil spring 50, and a plug 51 made of a synthetic resin material is provided at the tip thereof. To be The spring 50 is attached to a member 52 made of a synthetic resin material that is rotatably provided around the axis of the shaft 53. A second coil spring 54 is also attached to the member 52 and has a weight made of a metallic material at one end thereof.
55 is provided. The springs 50 and 54 are provided at an angle of 90 degrees or more with each other.

A first link 58 is pin-connected to the plunger of the solenoid 57, and a second link 59 is pin-connected to the first link 58. The second link 59 pivotally supports the member 52 by the shaft 53, and is angularly displaceably mounted on a mounting shaft 60 provided on the machine body.

With reference to FIG. 11, as long as at least one document is present on the spring 50, the following finger is kept at the position shown in FIG. 11 (2), and the spring 50 is placed substantially horizontally under the document. Extend. On the other hand, as shown in FIG. 11 (3), when the final document is taken out, the weight 55 acts on the member 52 and the weight 55
The springs 50, 54 are angularly displaced about the axis 53 by the self-weight of the.
In the position of FIG. 11 (3), both springs 50 and 54 extend in the direction of about 45 degrees from the horizontal plane. Spring 50 in connection with sensor 56
Is stopped and the following finger is held at the position shown in FIG. 11 (3).

By the movement from the position shown in FIG. 11 (2) to the position shown in FIG. 11 (3), the spring 50 passes in front of the sensor 56, and the stacking of the documents 39 occurs.
Sends a signal indicating that the last original has been supplied for copying.

After the last one of the stack 39 of originals is returned to the tray, the solenoid 57 is excited. By the action of the solenoid 57, the spring 50 is reset below the last one of the stack 39 of originals as shown in FIG. 11 (1).

Excitation of the solenoid 57 is performed for a short time of about 500 msec, and the link 58 is pushed up and held at the upper position for this period. At the upper end of the link 58, the second link 59
Are connected so that they can be angularly displaced. As the link 58 moves upward, the link 59 is angularly displaced about the mounting shaft 60. This angular displacement causes the link 59 to move to a substantially horizontal position as shown in FIG. 11 (4). Weight at this position
The action of 55 moves the spring 54 to a substantially horizontal position and the spring 50 to a substantially vertical position.

As shown in FIG. 11 (4), the plug 51 of the spring 50 is balanced so that it can be inserted under the stack 39 of originals at a position pointing downward. Next, when the solenoid 57 is demagnetized, the link 58 moves in a substantially vertical direction and the link 59 moves to a substantially vertical position, and the spring 55 causes the spring 50 to move to the original position due to the action of the weight 55. The member 52 rotates so that it can be inserted below the stack 39. This allows you to stack the documents 39
Can be cycled for copying.

In the third conventional example, the links 58, 59, the solenoid 57, and further the sensor 56 are provided to detect one circulation of the stacking 39 of the documents, so that the number of parts is increased by the complicated link mechanism.
High cost. In addition, the weight provided at one end of the spring 54
When the weight of 55 is heavy and one document in the stack 39 of documents is relatively lightweight, the plug 51 provided at the tip of the spring 50
In this case, a situation occurs in which an unfed original having a small number of sheets is picked up and detected by the sensor 56, and the detection operation of completion of supply becomes a malfunction.

As described above, according to the first conventional example, the space utilization efficiency is lowered by the detection unit 2, and according to the second conventional example, the completion of feeding is erroneously detected in a lightweight document. According to the third conventional example, erroneous detection of a light-weight original is likely to occur, the number of parts for detection increases, and the cost increases.

An object of the present invention is to improve the reliability of the feeding operation by providing a detection device for detecting all the stacked sheets in a group with a relatively simple structure and a low occupied volume. It is an object of the present invention to provide a sheet-shaped body supply device that can reduce costs.

Means for Solving the Problems The present invention relates to a sheet-shaped body feeding device that feeds the stacked sheet-shaped bodies one by one in order from the topmost sheet-shaped body, in which the sheet-shaped bodies are stacked and placed. The placing member, a supply means for supplying the sheet-like members stacked on the placing member, and the lower surface of the sheet-like members on the placing member can be contacted,
A detection protrusion that is rotatably provided around an axis extending along the mounting member, a spring that biases the detection protrusion upward, and a detection protrusion when there is no sheet-shaped body on the mounting member. Detection means for detecting the displacement by the spring, a pressing member for preventing the upward displacement of the sheet-like bodies stacked on the placing member to press the sheet-like bodies, and a driving means for rotationally driving the detecting protrusion. It is a sheet-shaped body supplying device including:

Operation According to the present invention, the sheet-like bodies are stacked and placed on the placing member, and are supplied one by one in order from the sheet-like body located at the uppermost portion by the supply means.

A detection protrusion is provided along the mounting member so as to be rotatable about an axis extending along the mounting member. The detection protrusion is rotatably driven by the drive unit and comes into contact with the lower surface of the sheet-like members stacked on the mounting member. The abutting detection protrusion is further spring-biased upward by the side of the stacked sheet-like bodies by a spring. On the other hand, a pressing means is provided above the stacked sheet-like bodies, and the upward biasing of the sheet-like bodies stacked on the placing member is prevented by the spring biasing of the detection protrusion by the spring. In this state, the sheet-like bodies stacked on the placing member are sequentially supplied one by one from the topmost one,
When the sheet-like body with which the detection projection is in contact does not exist on the mounting member, the detection projection is angularly displaced by the spring, and the angular displacement is detected by the detection means. In this way, it is detected that all the sheet-like bodies stacked on the mounting member have been supplied.

Embodiment FIG. 1 is a plan view showing the basic construction of an embodiment of the present invention, FIG. 2 is a side sectional view thereof, and FIG. 3 is a simplified view showing a circulating type document feeder 40 according to the present invention. FIG. Therefore, FIG. 2 is a cross-sectional view of the document feeder 40 as viewed from the back side of FIG.

The document feeder 40 is a transfer type electrostatic copying machine 42 (a sixth type described later).
(See the drawing), the plurality of sheet-shaped originals D stacked and placed on the placing member 11 are used as the sheet feeding means 12
The sheet is conveyed to the conveyance path 67 by and the one surface thereof is presented to the first reading position 61 where the first transparent plate 64 is arranged. The document whose presentation has been completed is conveyed to the reversing path 68 via the conveying path 108, and the conveyance direction of the document is reversed by the switchback operation in the reversing path 68, and then the second transparent plate.
The other surface is presented at a second reading position 62 constituted by 65.

The document whose both front and back sides have been presented is returned to the lowermost part of the document D placed on the placing member 11 by the storage / conveyance rollers 104 and 105 via the conveyance path 73. A document detecting device 10 is provided on a downstream side of the mounting member 11 in the document storage / conveying direction, and the operation of supplying the document D stacked on the mounting member 11 to the first and second reading positions 61 and 62 is performed. One cycle is detected.

The document detecting apparatus 10 will be described below with reference to FIGS. 1 and 2. With respect to the mounting member 11 on which the documents D that are cyclically supplied in the document supply device 40 are stacked, a rotary shaft 22 having an axis line extending along the mounting member 11 on the lower side thereof.
Are rotatably provided on the side plates 17 and 18 of the machine body by bearings 19 and 20 in the horizontal rotation direction. The rotary shaft 22 has one
A support cylinder 21 provided with a detection protrusion 13 for detecting circulation projecting radially outward is rotatably inserted between the side plates 17 and 18. A light-shielding detected piece 15 is fixed to the support cylinder 21 at a position deviated from the detection protrusion 13, and a detector S1 as an optical detection means is provided on the machine body. In the detector S1, it is detected that the light from the light emitting element is blocked by the detected piece 15 and does not reach the light receiving element, and the angular displacement of the detection projection piece 13 is detected.

A spring clutch portion 123 is provided on the rotary shaft 22 by projecting the side plate 18 of the machine body to the outside on the side opposite to the side plate 17. The spring clutch unit 123 includes a transmission sleeve 27 fixed to the rotary shaft 22 and a gear 24 rotatably supported by the rotary shaft 22.
And a coil spring 26 surrounding the boss portions 27a, 24a of the transmission sleeve 27 and the gear 24 facing each other, and a locking claw member 25 surrounding the coil spring 26. In the vicinity of the spring clutch portion 123, the locking claw member 2
Electromagnet means 34 having a lever 35 for locking to 5 is provided. The electromagnet means 34 has a coil and a yoke. A lever 35 capable of magnetic attraction is provided on the yoke so as to be angularly displaced, and
It is spring-biased by 29 in a direction away from the core 36.

In addition, the gear train 28 of the spring clutch unit 123 has a gear train 28
The drive shaft of the motor M1 is connected via. As a result, the rotational power from the motor M1 is transmitted through the gear train 28 to the gear 24
And the gear 24 is driven to rotate about the axis of the rotary shaft 22.

Further, on the placing member 11, a pressing member 16 for preventing upward displacement of sheet-like bodies such as documents stacked on the placing member 11 and pressing the sheet-like members is attached by hinges 30a, 30b and the like so as to be angularly displaceable. ing. The mounting member 11 of the pressing member 16
With respect to, the lower end is pinned to the plunger 32 of the solenoid SOL1 via a link 33. A tension spring 140 is attached to the link 33 on the side opposite to the solenoid SOL1 between the link 33 and the machine body. By energizing the solenoid SOL1, the link 33 is driven in the direction of arrow 124, whereby the holding member 16 can be angularly displaced in the direction of arrow 125 by a predetermined angle.

Such a holding member 16 has a substantially U-shaped opening 16a as shown in the plan view of FIG. 1, and the mounting member 11 facing the holding member 16 also has the opening 16a. The opening 11a is formed at a position corresponding to. As a result, the side plates 17, 1 are attached to the rotary shaft 22 having an axis extending along the mounting member 11.
The detection projection piece 13 of the support cylinder 21 that is axially supported between 8 is rotatable about the axis.

As shown in FIG. 2, the detection protrusion 13 is provided with a base portion 13a which is erected on the outer peripheral portion in the radial direction of the support cylinder 21 which is inserted into the rotary shaft 22.
And an abutting portion 13b that abuts the lower surface of the documents D stacked on the placing member 11 are integrally formed in a substantially L-shape that forms a predetermined angle with each other.

When the rotational power from the motor M1 is transmitted to the gear 24 via the gear train 28 from the position shown in FIG. 2, the transmitted rotational power rotationally drives the rotary shaft 22 via the spring clutch portion 123. . A pin 23 is press-fitted in a radial direction of a predetermined axial center portion of the rotary shaft 22, moves in the notch 21a of the support cylinder 21 around the axis, and abuts against the inner surface of the notch 21a to support the support cylinder 21. Is rotated in the direction of arrow 126. As a result, the detection protrusion 13 erected on the outer peripheral surface of the support cylinder 21 also
The mounting member 11 and the pressing member 16 rotate in the direction of the arrow 126 through the openings 11a and 16a, and the contact portion 13b contacts the lower surface of the documents D stacked on the mounting member 11 and stops.

With the contact portion 13b of the detection protrusion 13 in contact with the document D, the rotational power from the motor M1 is further transmitted to the rotary shaft 22, and the claw 25a of the locking claw member 25 of the spring clutch portion 123 is electromagnetized. While engaging with the claw 38 of the lever 35 of 34,
The diameter of the torsion spring 14 whose one end is fixed to 22 and whose other end is fixed to the support cylinder 21 is reduced. When the claw 25a of the locking claw member 25 is locked to the claw 38 of the lever 35, the power transmission in the spring clutch portion 123 is cut off, and the rotational power from the motor M1 is not transmitted to the rotary shaft 22.

In this manner, the contact portion 13b of the detection protrusion 13 contacts the lower surface of the document D, and the document D is placed on the mounting member 11 in a state of being biased upward by the torsional force of the reduced diameter spring 14. When the document is fed in the direction indicated by the arrow 127 in order from the topmost one and returned to the bottom of the document D from the direction indicated by the arrow 128 to advance the document feeding operation, the document on the contact portion 13b of the detection projection 13 is moved. Although the number of sheets is reduced and pushed up, the upward displacement is restricted at the position where the document D contacts the pressing member 16.

The document D is placed between the contact portion 13b of the detection protrusion 13 and the pressing member 16.
When there is no longer, the detection protrusion 13 loses its support and the spring
The torsional force of 14 causes angular displacement in the direction of arrow 129. This angular displacement stops at the position where the upstream end surface in the rotation direction 126 in the notch 21a of the support cylinder 21 comes into contact with the pin 23 press-fitted into the rotation shaft 22. At this time, along with the angular displacement of the detection protrusion 13, the detection target 15 of the support cylinder 21 blocks the optical path of the detector S1, and the angular displacement of the detection protrusion 13 is detected.

Further, in the document feeding device 40, a lid 31 is provided above the document D stacked on the placing member 11 and is attached so as to be openable and closable around an axis pin-connected to the bracket of the machine body. The opening / closing operation of the lid 31 is detected by detection means (not shown), and controls the excitation / demagnetization of the solenoid SOL1. As a result, when the lid 31 is opened, the pressing member 16 is also released to facilitate placing the document D on the placing member 11, and when the lid 31 is closed, the pressing member 16 is also placed. It is arranged above the originals D stacked on the placing member 11 so that the upward displacement of the originals D can be prevented.

FIG. 4 is an exploded perspective view showing the configuration of the rotary shaft 22 of the document detecting apparatus 10. Referring also to FIG. 1 and FIG. 2, a pin 23 is press-fitted into the rotary shaft 22 at the outer peripheral portion in the radial direction of the central portion along the axial direction, and the support cylinder 21 is rotatably inserted into each other. Are supported by the pair of bearings 19 and 20 and attached to the side plates 17 and 18 of the machine body. A torsion spring 14 is inserted through the rotary shaft 22, one end of which is fixed to the rotary shaft and the other end of which is fixed to the support cylinder 21.

The spring clutch portion 123 provided outside the side plate 18 is
With respect to the transmission of the rotational power from the motor M1, the gear 24 provided on the primary side, the transmission sleeve 27 provided on the secondary side, the gear 24 and the transmission sleeve 27 are surrounded by boss portions 24a, 27a. It is composed of a coil spring 26 that transmits / blocks power by reducing the diameter, and a locking claw member 25 that surrounds the coil spring 26.

The gear 24 is rotatably supported by the rotary shaft 22 and the transmission sleeve 27 is fixed to the rotary shaft 22. Boss 24a of gear 24
The coil spring 26, which surrounds the transmission sleeve 27 and the boss portion 27a of the transmission sleeve 27, has one end fixed to the locking claw member 25 and the other end fixed to the transmission sleeve 27. The winding direction of the coil spring 26 is determined such that the rotational power transmitted from the motor M1 to the gear 24 via the gear train 28 reduces the diameter of the coil spring 26 and tightens the two boss portions 24a, 27a.

As a result, when the claw 38 of the lever 35 is locked to the locking claw member 25a, the coil spring 26 does not tighten the two boss portions 24a and 27a when the gear 24 rotates. On the other hand, when the claw 25a of the locking claw member 25 and the claw 38 are released from the locked state, the coil spring 26 is rotated by the rotational power from the gear 24.
Tighten the two bosses 24a and 27a. Therefore, the rotational power transmitted to the gear 24 is transmitted from the boss portion 24a of the gear 24 to the rotary shaft 27 via the boss portion 27a of the transmission sleeve 27. The rotational power of the rotary shaft 22 is transmitted to the support cylinder 21 via the torsion spring 14.

FIG. 5 is a side sectional view showing the operation of the document detecting apparatus 10. When performing copying using the copying machine 42 including the document supply device 40, the operator first places the document D on the placing member 11. At this time, the lid 31 of the document feeder 40 is released in the direction of the arrow 130 as shown in FIG.
The release of 31 is detected, which causes the electromagnetic solenoid SOL1
Is excited and resists the tensile force of the tension spring 140,
Also, the document D is released in the direction of arrow 125 and placed on the mounting member 11.
The device member is brought to the state of FIG. 5 (1) where it is easy.

In the state of FIG. 5 (1), after placing the document D on the placing member 11 and closing the lid 31 in the direction of the arrow 131, this is detected, the electromagnetic solenoid SOL1 is demagnetized, and the tension spring 140 is released. The pressing member 16 is also angularly displaced in the direction of arrow 132 by the pulling force and is arranged above the document D. As a result, the pressing member 16 can prevent the document D from being displaced upward on the placing member 11.

When the operation of the document feeding device 40 is started in the state where the document D is stored in the document feeding device 40, the motor M1 shown in the first figure is activated, and the rotational power is transmitted to the gear 24 via the gear train 28. Next, when the electromagnet means 34 is excited, the lever 35 is attracted toward the core 36 against the tensile force of the spring 29,
As a result, the locked state between the lever 35 and the locking claw member 25 is released. Therefore, the rotational power transmitted to the gear 24 is
The coil spring 26 is transmitted to the rotating shaft 22 via a spring clutch portion 123 that is in a connected state by reducing its diameter. As the rotary shaft 22 is driven to rotate, the pin 23 abuts on the end face on the downstream side in the rotation direction in the notch 21a of the support cylinder 21, and the support cylinder 21
Is rotated in the direction of arrow 126. With this, the detection protrusion 1
3 also rotates in the direction of arrow 129.

At this time, when the document D is not placed on the placing member 11, the support cylinder 21 including the detection protrusion 13 is located at 36 from the position in FIG.
The detected piece 15 blocks the optical path at the position rotated by 0 °, and a detection signal is derived from the detector S1. As a result, it is determined whether the feeding operation of the document feeding device 40 is stopped or continued.

When the document D is placed on the placing member 11 in advance, the detection protrusion 13 rotates in the direction of the arrow 126 to open the opening 11a of the placing member 11.
The abutting portion 13b via the abutment portion abuts the lower surface of the document D, and the movement thereof is restricted to the state of FIG. 5 (2).

In the state of FIG. 5 (2), the rotational power is further transmitted from the gear 24 to the rotary shaft 22, so that the torsion spring 14 whose one end is fixed to the rotary shaft 22 is twisted in the diameter reducing direction. Next, the locking claw member 25 of the spring clutch part 123 rotates in the direction of the arrow 126, and the claw 25a is locked to the claw 38 of the lever 35, whereby the spring clutch part 123 is brought into the disengaged state and the gear 24 The rotary power is not transmitted to the rotary shaft 22. In this state, the support cylinder 21 including the detection projection 13 has the pin 23 press-fitted into the rotation shaft 22 that is angularly displaceable between the both end faces in the rotation direction of the notch 21a of the support cylinder 21, and has the above-mentioned twisting. Due to the reduced diameter of the spring 14, the contact portion 13b is in a state of urging the document D upward.

As shown in FIG. 5 (3), the arrow 127 is drawn from the state of FIG. 5 (2) in order from the document D located at the uppermost position.
When the original D is again stored in the lowermost part of the original D from the direction of arrow 128 after being supplied in the direction of the arrow D, the detection projection 13 is displaced upward as the original D is supplied and stored again, and the original not fed. And the re-stored original are interposed to separate both originals.

Further, as shown in FIG. 5 (4), even when the feeding operation of the document D progresses and the number of unfed documents decreases and the own weight decreases, the detection protrusion 13 causes the unfed documents to move upward. This displacement is prevented by the pressing member 16 arranged above the document D.

From the state shown in FIG. 5 (4), when the un-fed final document interposed between the detection protrusion 13 and the pressing member 16 is fed, the torsion spring 14 causes the support cylinder 21 to rotate around the rotary shaft 22. Rotate
The detection protrusion 13 is angularly displaced in the arrow 133 direction through the opening 16a of the pressing member 16. The support cylinder 21 is angularly displaced to a position where the rotation-direction upstream end face of the notch 21a comes into contact with the pin 23 that has stopped together with the rotation shaft 22 and stops. At this time, the detected piece 15 provided on the support cylinder 21 blocks the optical path of the detector S1, and a detection signal indicating that one circulation of the document D1 is completed is derived. Based on this detection signal, the document feeder 40
Also, it is determined that the copying operation in the copying machine 42 is stopped or continued.

When the operation of supplying the document D by the document supply device 40 is performed again, the detection protrusion 13 is rotationally driven in the direction of arrow 129, is arranged at the position of FIG. 5 (2), and the above-described operation is repeated. .

As described above, according to the present embodiment, since the pressing member 16 is disposed above the documents D stacked on the placing member 11, when the number of the documents D to be supplied is small or small. Document D due to the torsional force of the torsion spring 14 when the original weight becomes lighter or when a thin original is placed and its own weight is light.
Can be prevented, and erroneous detection of one circulation of the document D can be prevented.

Further, since the pressing member 16 is opened / closed in conjunction with the opening / closing operation of the lid 31 of the document feeding device 40, the operator only needs to operate the lid 31, and the document D is placed on the placing member 11. Is easy. As described above, the operation of the pressing member 16 becomes unnecessary, and the operability is improved.

As described above, according to the present embodiment, one circulation detection of the completion of supply of the document D in the document supply device 40 or the like can be reliably performed by the document detection device 10 having a small occupied volume and a relatively simple structure. The cost can be reduced.

FIG. 6 is a simplified cross-sectional view showing the basic structure of the copying machine 42 provided with the document supply device 40 including the document detection device 10.

At the upper part of the main body 41 of the copying machine 42, a document feeder 40 and a pressing plate 49 are provided.
And are provided. The first transparent plate 64 and the second transparent plate 65 provided in the document feeding device 40 constitute a first reading position 61 and a second reading position 62, respectively.

Further, with respect to the pressing plate 49, the third transparent plate 66 is originally formed on the pressed surface of 41, and constitutes the third reading position 63. A document image of a book bound into a book is presented and exposed at the third reading position 63.

Referring to FIG. 3, a plurality of sheet-shaped originals D having the same size and arranged in the order of, for example, pages are placed on the placing member 11 of the original feeding device 40, and the original surface of the first page is on the lower side. It is placed so that it faces. The documents D stacked on the placing member 11 are sequentially taken out one by one from the document located at the uppermost position by the sheet feeding means 12 arranged on the upper side thereof, and are fed to the conveyance path 67 by the sheet feeding roller 43. To be paper. The paper feeding means 12 is a roller.
The sheet feeding belt 107 is wound around 106a, 106b, 106c, and 106d.

The transport path 67 includes a pair of guide members and a pair of rollers 44, 45, 46 provided along the transport direction, and transports the fed document Di onto the first transparent plate 64. Here, a pair of first registration rollers 47 is provided at the exit of the transport path 67 on the first transparent plate 64 side. The power transmission means is connected to the rotation shaft of the first registration roller 47 via a clutch CLT1 (not shown). The rotation / stop control of the first registration roller 47 by the connection / disconnection control of the clutch CLT1 controls the timing of conveyance of the document Di to the first transparent plate 64.

The document Di is conveyed on the first transparent plate 64,
On the other hand, the original image on the one surface is presented at the first reading position 61.
Next, the document Di is reversed in its conveying direction by the reversing means 134, and then the second transparent plate 65 is moved by the second registration roller 48.
Transported up. In the reversing means 134, the first transparent plate 64
The original document Di is introduced into the conveyance path 68 from the conveyance path 108 formed by a pair of guide members and a pair of conveyance rollers 74 and 75 provided along the conveyance direction. Transport route 68
Is provided with a reversing roller 76 capable of rotating in the normal and reverse directions, and the original Di conveyed on the conveying path 68 is transferred to the reversing roller 76.
By reversing the rotation direction of 76, it is conveyed to the conveyance path 135. The document Di guided to the transport path 135 is transported by the transport roller 1
It is conveyed to the second registration roller 48 by 00.

A power transmission means is connected to the rotation shaft of the second registration roller 48 via a clutch CLT2 (not shown). The second registration roller by the connection / disconnection control of this clutch CLT2
The rotation / stop control of 48 controls the time when the document Di is conveyed to the second transparent plate 65. The original Di conveyed by the second registration roller 48 onto the second transparent plate 65 is previously reversing means.
At 134, the conveyance direction is reversed, so the original image on the other side is presented at the second reading position 62.

The document Di for which the presentation of the document images on both surfaces is completed is guided along a transport path 73 formed by a pair of guide members and a pair of transport rollers 101 and 102 provided along the transport direction, and the document D is transported by the transport roller 103. Are transported to the mounting member 11 on which the sheets are stacked. The document Di to be transported is stored and returned to the bottom of the document D stored on the mounting member 11 by the storage / conveying rollers 104 and 105 provided along the mounting member 11. On the downstream side of the placement member 11 in the document storage direction, the above-described detection device 10 is provided to detect one cycle of the feeding operation of the stacked documents D. One cycle of document supply is detected by distinguishing from the re-stored document and whether or not document D is loaded is detected.

Referring again to FIG. 6, the exposure means is provided inside the main body 41 of the copying machine.
76 is provided, and the original image presented at the first and second reading positions 61 and 62 or the third reading position 63 has a right cylindrical shape having a horizontal rotation axis and is rotationally driven in the arrow R13 direction. The image is formed on the photoconductor 77, and an electrostatic latent image corresponding to the original image is formed on the surface of the photoconductor 77 which is precharged by the charging corona discharger 78. In the exposure means 76, the first moving body 71 including the light source 69 and the reflecting mirror 70 has the first to third reading positions 61.
To 63, respectively, and illuminates the presented document, and the reflected light is reflected by the mirrors 79 and 80 of the second moving body 72 and the zoom lens 8.
1, and an image is formed on the photoconductor 77 via the reflecting mirror 82.

The electrostatic latent image formed on the photoconductor 77 is visualized as a toner image by the developing device 83 and transferred onto one surface of the recording paper P by the transfer corona discharger 84. The recording paper P is stored in the paper feed cassette 85 in advance, is conveyed by the conveying means 87 including the pair of third registration rollers 86, and is guided to the transfer area 88 where the transfer is performed. Third registration roller 86
A power transmission means is connected to the rotation shaft of C through a CLT3 (not shown). This CLT3 connection / disconnection control is performed by the clutches CLT1 and CLT2 of the first or second registration rollers 47 and 48.
The transfer corona discharger 84 can adjust the timing of conveyance of the recording paper P by the third registration roller 86 with respect to the toner image on the photoconductor 77 by performing the transfer corona discharger 84.
The recording paper P on which the toner image is transferred by the conveying means 89
Then, it is guided to the fixing device 90 and fixed.

The recording paper P after fixing is recorded by the direction changing means 91.
The conveyance direction is reversed and the intermediate storage means passes through the conveyance path 92.
It is temporarily stored in 93. The recording paper P in the intermediate storage means 93 is again guided to the transfer area 88 by the conveying means 94 and the third registration roller 86, and the toner image is transferred onto the other surface of the recording paper P. The recording paper P, which has been transferred, is ejected to a tray 96 outside the machine via the conveyance means 89, the fixing device 90, and the conveyance path 95.

Here, when one surface of the document D is read and exposed by the photoconductor 77, the moving body 71 is positioned immediately below the first reading position 61, and when the other surface is read and exposed, the second reading position 92. It is located directly below. In the case of a document such as a book, the first moving body 71 is horizontally scanned at the third reading position 63 and exposure is performed. At this time, the second moving body 72 is also scan-driven in the same direction as the first moving body 71 at a half scanning speed. In this way, the front and back sides of the document D are copied onto the front and back sides of the corresponding recording paper P, respectively. Paper cassette 85,97,9
From 8, 99, for example, recording papers P having different sizes are selectively conveyed to the transfer area 88.

FIG. 7 is a block diagram showing an electrical configuration of the copying machine 42. In the configuration of the copying machine 42, motors M1, M2, M3, which rotate and drive a plurality of rollers including the document detection device 10
Are connected to the motor drive circuit 110. Further, an original document Di provided between the roller and the motor to control the driving timing of the original document and convey the document in the original document feeder 40, and the main body
The clutches CLT1, CLT2, CLT3, ... Which synchronize with the conveyance timing of the recording paper P conveyed in 41 are connected to the clutch drive circuit 111. The electromagnetic solenoids SOL1, SOL2, ... For activating the electromagnet means 34 are connected to the solenoid drive circuit 112. These drive circuits 110-112
Are connected to the interface circuit 113.

The interface circuit 113 includes a DC power source 114, various detectors for detecting the transport state of the recording paper P including the detector S1 for detecting one circulation of the document D, a driving circuit 115 for driving the exposing means 76, and further copying. Input operation keys 119 of the operation panel 116 provided in the machine body 41, a display drive circuit 117 for driving the display means 118 of the operation panel 116, and the like are connected.

The interface circuit 113 is connected to the control circuit 120 realized by a microcomputer or the like, and sends the detection signal from the detector to the control circuit 120,
Each drive circuit 1 according to the control signal from the control circuit 120
Controls 10 to 112,115,117. The control circuit 120 includes a read only memory (ROM) 121 and a random access memory (RA).
M) 122 is connected, and the control circuit 120 controls the copying operation in cooperation with the copying machine 42 and the document feeder 40 in accordance with a control program stored in advance in the memory 121. The memory 122 is used, for example, as a calculation area for a counter, tires, flags, etc., which is necessary for controlling the copying operation.

Further, the interface circuit 113 drives the exposure means 76 via the drive circuit 115, and controls the lighting / extinguishing of the light source 69 at the first to third reading positions 61 to 63 and the lighting level.
Further, the interface circuit 113 sends a signal inputted by the input operation key 119 of the operation panel 116 to the control circuit 120, and drives the display means 118 by the display drive circuit 117 for information about the progress situation of the copying operation. indicate.

Furthermore, the interface circuit 113 includes a document feeder 4
Select switch SSW1 to S that selects the copy mode using 0
SW4 is connected. Accordingly, various copying modes such as single-sided original to single-sided copying, single-sided original to double-sided copying, double-sided original to single-sided copying, and double-sided original to double-sided copying are selected as modes for performing multiple-sheet copy recording from a plurality of originals D. It

As described above, since the document detecting device 10 that can reliably detect the completion of the supply of the document D is provided in the document feeding device 40, the reliability of the document feeding device 40 is improved, and the document feeding device 40 is installed. The quality of the copying machine 42 is improved.

EFFECTS OF THE INVENTION According to the present invention, the detection protrusion provided rotatably around the axis extending along the mounting member is rotationally driven by the driving means to the lower surface of the sheet-like bodies stacked on the mounting member. They are brought into contact with each other and further spring-biased by a spring.
On the other hand, upward displacement of the sheet-like bodies stacked on the placing member by the spring bias is prevented by the holding means. As a result, the displacement of the detection protrusion due to the spring when the sheet-like body does not exist between the detection protrusion and the pressing means on the mounting member is detected by the detection means. It is possible to reliably detect the completion of the supply of the sheet, and the reliability of the detection operation is improved. Further, such a sheet-shaped body supply device is realized by a relatively simple structure, the occupied volume can be reduced, and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing the basic configuration of an embodiment of the present invention,
2 is a side sectional view thereof, FIG. 3 is a simplified side sectional view showing the document feeding device 40, FIG. 4 is an exploded perspective view showing a structure relating to the rotary shaft 22, and FIG. 6 is a side cross-sectional view for explaining the operation, FIG. 6 is a simplified cross-sectional view showing the basic structure of a copying machine 42 including the document feeding device 40, and FIG. 7 is a block diagram showing the electrical structure of the copying machine 42. , FIG. 8 is a diagram showing a first conventional example, FIG. 9 is a diagram showing a second conventional example,
FIG. 10 is an exploded perspective view showing a third conventional example, and FIG. 11 is a third perspective view.
FIG. 10 is a diagram showing an operation of the conventional example of FIG. 10 …… Original document detector, 11 …… Placement member, 12 …… Paper feeding means, 13 …… Detecting projection, 14 …… Torsion spring, 15 …… Detected piece, 16 …… Pressing member, 22 …… Rotating shaft, 28 ... Gear train, 34
...... Electromagnetic means, 40 ...... Document feeder, 42 ...... Copier,
123 …… Spring clutch, 140 …… Tension spring, M1…
… Motor, S1… Detector

Claims (1)

[Claims] 1. A sheet-shaped body feeding device for feeding the stacked sheet-shaped bodies one by one in order from the topmost one, and a mounting member on which the sheet-shaped bodies are stacked and placed. A supply means for supplying the sheet-like bodies stacked on the member, and the lower surface of the sheet-like bodies on the placing member can be contacted,
A detection protrusion that is rotatably provided around an axis extending along the mounting member, a spring that biases the detection protrusion upward, and a detection protrusion when there is no sheet-shaped body on the mounting member. Detection means for detecting the displacement by the spring, a pressing member for preventing the upward displacement of the sheet-like bodies stacked on the placing member to press the sheet-like bodies, and a driving means for rotationally driving the detecting protrusion. A sheet-like body feeding device comprising: