JPH11100136A - Paper feeding device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even when spring clutch means is used,
To provide a paper feeding device capable of easily removing jammed sheet paper. SOLUTION: A support plate 72 supporting a recording paper,
A sheet feeding device including a sheet feeding roller 74 for feeding a recording sheet;
The support plate 72 is held in a paper feeding state where the recording paper is pressed against the paper feeding roller 74 and in a non-paper feeding state where the recording paper is separated from the paper feeding roller 74. The paper feed roller 74 is drivingly connected to a drive motor via a spring clutch means 100, and the spring clutch means 100 has a torsion coil spring 102 and a control sleeve 112 for controlling the diameter of the torsion coil spring 102. The support plate 72 is provided with a rotation prevention member 114. When the support plate 72 is positioned at the retracted position, the rotation prevention member 114 acts on the control sleeve 112 to prevent rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for feeding a sheet of paper toward a predetermined conveying path.

[0002]

2. Description of the Related Art Image forming apparatuses such as copiers, printers, and facsimile machines are equipped with a paper feeder for feeding a sheet of paper on which an image is to be formed toward a predetermined transport path. The sheet feeding device includes a sheet receiving portion provided at one end of a transport path. The sheet receiving portion has a support plate for supporting the sheet-shaped paper and a feeding plate for supplying the sheet-shaped paper. And a paper roller. The support plate is rotatably provided with the rear end as a fulcrum, and a plurality of sheets of paper are placed on the surface of the support plate in a stacked state. The support plate is selectively held in a sheet feeding state in which the supporting sheet is pressed against the sheet feeding roller, and in a non-sheet feeding state in which the supporting sheet is separated from the sheet feeding roller. That is, the support plate is kept in the supply state when the sheet-shaped paper is supplied from the sheet receiving portion, but when the sheet-shaped paper is replenished (or removed) from the sheet receiving portion, the support plate is set in the non-feeding state. Will be retained.

In such a paper feeder, the paper feed roller is drivingly connected to a drive motor via a clutch means,
The rotational driving force from the drive motor is transmitted to the paper feed roller via this clutch means. As clutch means, electromagnetic clutch means, spring clutch means, and the like are used.

[0004]

In such a paper feeder, when an electromagnetic clutch is used as the clutch, when the electromagnetic clutch is de-energized, the rotational driving force from the drive motor is applied to the paper feed roller. And the supply of the sheet-like paper by the paper feed roller is stopped. In this deenergized state, the rotational driving force from the paper feed roller is not transmitted to the electric motor side, and the paper feed rotor is allowed to freely rotate. Therefore, when the sheet is jammed in the sheet receiving section, the sheet feeding roller rotates in the direction opposite to the sheet feeding direction by pulling the jammed sheet to the front side, so that the jammed sheet can be easily removed. Can be excluded. As described above, when the electromagnetic clutch is used, there is a merit that the sheet-shaped paper jammed in the sheet receiving portion can be easily removed. However, since the electromagnetic clutch itself is expensive, the manufacturing cost is increased. There is.

On the other hand, when the spring clutch means is used as the clutch means, the manufacturing cost can be reduced since the spring clutch means itself is inexpensive, but the following problem newly occurs. More specifically, when a rotational driving force in a predetermined direction from the driving motor is transmitted to the spring clutch means, the diameter of the torsion coil spring is reduced by the rotational driving force, whereby the spring clutch means is brought into a drivingly connected state. Therefore, the rotational driving force from the electric motor is transmitted to the paper feed roller via the spring clutch means, and the paper feed roller is rotated in the paper feed direction. The driving connection state of the spring clutch means is released by, for example, reversing the rotation direction of the driving motor. In such a spring clutch means, the torsion coil spring is also reduced in diameter and brought into a driving connection state even when the sheet feeding roller is rotationally driven in the direction opposite to the sheet feeding direction. Therefore, for example, when the sheet-like paper is jammed in the sheet receiving portion, and the jammed sheet-like paper is pulled toward the near side, the spring clutch means is in the drive connection state and is transmitted to the electric motor side.
A large load is acting on the electric motor side and does not rotate due to the rotational driving force from the supply roller side, thereby preventing the supply roller from rotating. As described above, the supply roller is not rotated when the jammed sheet is pulled to the near side, and it becomes difficult to remove the jammed sheet.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet feeding device capable of easily removing a jammed sheet of paper even when a spring clutch is used as the clutch.

[0007]

According to the present invention, there is provided a sheet receiving portion for receiving a sheet of paper. The sheet receiving portion has a support plate for supporting the sheet of paper, and a support plate for supporting the sheet of paper. A sheet supply roller for supplying the sheet-shaped paper toward a predetermined conveyance path, and the support plate supports a sheet-supply state in which the supported sheet-shaped paper is pressed against the sheet supply roller, and is supported. The sheet-like paper is selectively held in a non-feed state in which the sheet-like paper is separated from the feed roller, and is positioned at a retracted position in the non-feed state, and the feed roller is drivingly connected to a drive motor via a spring clutch means. The spring clutch means controls the diameter of the torsion coil spring, which transmits the rotational driving force from the drive motor to the paper feed roller by reducing the diameter, and the diameter of the torsion coil spring. The support plate further includes a rotation prevention member for preventing rotation of the control sleeve, and when the support plate is in the sheet feeding state, the rotation prevention member is When the support plate is located at a distance from the control sleeve and the support plate is located at the retracted position, the rotation preventing member acts on the control sleeve, thereby preventing the rotation of the control sleeve. It is a paper feeding device.

According to the present invention, since the spring clutch is used to selectively transmit the rotational driving force from the driving motor to the sheet feeding motor, the manufacturing cost of the sheet feeding apparatus can be reduced. Further, a rotation preventing member for controlling the rotation of the control sleeve of the spring clutch means is provided on the support plate. When the support plate is in the paper feeding state, the rotation preventing member is located apart from the control sleeve, and the rotation of the control sleeve is allowed, and thus the rotational driving force from the driving motor is transmitted to the paper feeding motor. .
On the other hand, when the support plate is located at the retracted position and becomes inactive, the rotation preventing member acts on the control sleeve to prevent its rotation. Therefore, in this situation,
The spring clutch means is in the non-drive connection state, and the rotational force in the direction opposite to the paper feed direction of the paper feed roller is not transmitted to the drive motor side. Therefore, even when the sheet-shaped paper is jammed in the sheet receiving portion, the sheet feeding roller is allowed to rotate in the direction opposite to the sheet feeding direction, and the jammed sheet-shaped paper is pulled toward the front side to be easily removed. be able to.

Further, according to the present invention, the rotation preventing member may include a first member.
And a second angular position pivoted from the first angular position to a direction approaching the spring clutch means. And a biasing spring for elastically biasing the rotation preventing member toward the second angular position is interposed between the control sleeve and the rotation preventing member. The rotation preventing member is held at the second angular position by the action of the biasing spring, and when the rotation preventing member acts on the control sleeve, the rotation preventing member is held at the first angular position against the biasing spring; Thereby, the rotation preventing member elastically acts on the control sleeve.

According to the present invention, the rotation preventing member is mounted to be pivotable between the first angular position and the second angular position,
A displacement spring is provided for elastically displacing the rotation preventing member toward the second angular position. Therefore,
In a state in which the rotation preventing member is separated from the control sleeve, the rotation preventing member is held at the second angular position by the action of the displacement spring. However, in a state in which the rotation preventing member acts on the control sleeve, the rotation preventing member is opposed to the action of the biasing spring. The rotation preventing member is pivoted to the first angular position, whereby the rotation preventing member elastically acts on the control sleeve by the action of the biasing spring, so that the rotation of the control sleeve can be reliably prevented.

Further, the present invention provides the above-mentioned support plate,
An operating member is provided for turning the lever toward the retracted position.

According to the present invention, since the operation member is provided on the support plate, the support plate can be easily positioned at the retracted position by operating the operation member.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a cross-sectional view schematically showing an example of a facsimile provided with an embodiment of a sheet feeding device according to the present invention, and FIG. 2 is an exploded perspective view showing a sheet feeding device provided in the facsimile. FIG. 3 is a side sectional view showing the sheet feeding device.

In FIG. 1, the facsimile apparatus shown in FIG. 1 includes an apparatus housing 2, and a recording paper conveying means 4 for conveying recording paper, which is a sheet-like member, is provided at a lower portion of the apparatus housing 2. Reference numeral 4 defines a recording paper transport path 6 extending leftward in FIG. The recording paper conveying means 4 includes a conveying roller pair 8, a guide plate 10, and a fixing device 1.
2 and a discharge roller pair 14.

Above the recording paper transport path 6, an image forming means 16 for forming an image is provided. The illustrated image forming means 16 includes a rotating drum 18 having a photosensitive layer on the peripheral surface. Around the rotating drum 8, a charger 20 for charging the photosensitive layer, and image information is stored on the charged photosensitive layer. Irradiating means 22, a developing device 24 for applying toner particles to the photosensitive layer irradiated with light, and transfer charging for transferring a toner image formed on the surface of the photosensitive layer to recording paper conveyed through the recording paper conveying path 6. There is provided a device 26 and a cleaning device 28 for removing toner particles remaining on the surface of the photosensitive layer after the transfer of the toner image.

At one end (upstream end) of the recording paper transport path 6,
Two paper feeding devices 30 and 32 are provided. The paper feeding device 30 provided on the lower side is of a cassette type,
The cassette receiving portion 34 includes a cassette container 36 in which recording sheets are stored in a stacked state. The cassette container 34 is detachably mounted on the cassette receiving portion 34. This cassette receiver 3
4, a paper feed roller 38 is provided.
Supplies the recording paper accommodated in the cassette container 36 toward the recording paper transport path 6 one by one. The paper feeding device 32 provided on the upper side is a paper feeding device to which an example of the present invention is applied. This sheet feeding device will be described later in detail. The paper feeding devices 30 and 32 are selectively operated, and the selected paper feeding device 3 is selected.
The recording paper from 0 and 32 is supplied to the recording paper transport path 6, and the toner image formed by the image forming unit 16 is transferred to the surface of the recording paper transported through the recording paper transport path 6 and thus transferred. The toner image is formed as a permanent image on the recording paper by the action of the fixing device 12.

A document reading device 40 is provided on the upper portion of the device housing 2. This document reading device 40
Is provided with a document transport means 44 for defining a document transport path 42 for transporting a document to be read. Document conveying means 44
Is composed of a pair of document conveying rollers 46 and 48.
Document supply means 5 is provided at one end (upstream end) of document transport path 42.
The document supply means 50 includes a separation roller 52 for supplying a document to be read toward the document transport path 42 one by one. Document reading means 54 for reading image information on the front surface of the document conveyed through the document conveyance path 52 is provided below the document conveyance path 4. The document reading means 54 includes reading means (for example, a CCD) for reading image information and an optical device for guiding the image information of the document to the reading means.

The above-described facsimile is an example of an apparatus to which the paper feeder according to the present invention is applied, and the paper feeder of the present invention is similarly applied to an image forming apparatus other than a facsimile, such as a copying machine and a printer. can do.

Next, the sheet feeding device 32 will be described with reference to FIGS. 2 and 3 together with FIG. The illustrated paper feeding device 32 includes a sheet receiving portion 62 disposed at one end of the recording paper transport path 6. In this embodiment, there is provided a sheet receiving member 66 for receiving the recording paper 64 which is a sheet of paper in a stacked state, and the sheet receiving member 66 defines the sheet receiving portion 62. The sheet receiving member 66 has a support portion 68 extending substantially vertically upward and a guide portion 70 extending substantially horizontally from the lower end of the support portion 68. The support portion 68 constitutes a part of the apparatus housing 2. ing.

The paper feeder 32 further includes a support plate 72 for supporting the stacked recording papers 64, and a recording paper 64.
And a paper feed roller 74 for supplying the sheet one by one. A pair of frames (not shown) are provided inside the device housing 2 at intervals in the front-rear direction of the device (the direction perpendicular to the paper surface in FIGS. 1 and 4 and the left-right direction in FIG. 2).
Is provided, and the support plate 72 is pivotably supported between the pair of frames. In this embodiment, the support plate 72 has a plate body 76 that supports the recording paper 6, and on both sides of the plate body 76, width regulating portions 78 and 80 for aligning the width of the recording paper 64 are provided. The width regulating portions 78 and 80 extend from one end (rear end) of the plate body 76 to the other end (front end). Width regulating part 78,
A support pin 82 (only one provided in one width regulating portion 78 is shown in FIG. 2) is provided at one end of the pair 80, and these support pins 82 are connected to the pair of frames (not shown). It is supported rotatably. Therefore, the support plate 72 has one end (rear end) thereof.
And as a fulcrum, and supports the front portion of the stacked recording paper 64 as shown in FIGS. Separating claws 84 for separating the stacked recording papers 64 one by one are provided at both corners of the other end (front end) of the support plate 72.
(Only one is shown) is swingably provided.

The paper feed roller 74 is disposed on one side (the left side in FIG. 1 and the right side in FIG. 3) of the other end of the support plate 72. In this embodiment, a shaft member 86 is rotatably supported between the pair of frames via a bearing (not shown), and a pair of paper feed rollers is axially spaced from the shaft member 86. 74 is fixed. One or three or more paper feed rollers 74 can be provided. Since the paper feed roller 74 is provided in this manner, as shown in FIG. 3, when the support plate 72 is in the paper feed state, the recording paper 64 (the uppermost recording paper) supported by the support plate 72 is fed. It is pressed against the roller 74. On the other hand, as shown in FIG. 4, when the support plate 72 is in the non-feed state, the recording paper 64 supported by the support plate 72 is separated from the paper feed roller 74. It does not work. In order to hold the support plate 72 in the paper feed state, the other end (front end) of the support plate 72 is connected to the paper feed roller 7.
A biasing spring (not shown) that resiliently biases toward 4 can be provided. When the bias spring is provided in this manner,
The recording paper 64 supported by the support plate 72 is elastically pressed against the paper feed roller 74 by a biasing spring.

In connection with the feed roller 74, a friction member 85
Is provided. In this embodiment, a support piece 87 is provided below the paper feed roller 74 in FIG. 3, and a friction member 85 is attached to the upper surface of the support piece 87 (the surface facing the paper feed rotor 74). The support piece 87 is also provided with a spring member (not shown) for pressing the friction member 85 against the paper feed roller 74 with a predetermined pressure. This friction member 85
The recording paper 64 in the stacked state cooperates with the paper feeding roller 74 that is driven to rotate in the paper feeding direction indicated by an arrow 98 (FIGS. 2 and 3).
Are supplied one by one.

The support plate 72 is provided with an operation member 88 for rotating the support plate 72. In this embodiment, an attachment member 90 is fixed to one width regulating portion 78 of the support plate 72 by means such as welding, and an attachment portion 92 of the operation member 88 is fixed to the attachment member 90 by a fixing screw (not shown). Mounted. The operating member 88 also has an operating portion 94 extending upward in an arc shape. Since the operating member 88 is provided, the operating plate 94 is operated to push the operating member 88 in the counterclockwise direction indicated by the arrow (FIG. 2). It can be pivoted in the direction shown and positioned in the retracted position shown in FIG. In the retracted position, the other end of the support plate 72 abuts a part of the sheet receiving member 66, thereby preventing the pivoting movement beyond the retracted position. When the support plate 72 is in the retracted position, as shown in FIG.
The recording paper 64 supported by 2 is in a non-paper feeding state in which it is separated from the paper feeding roller 74.

The paper feed roller 74 is driven to rotate in a paper feed direction indicated by an arrow 98 and in a direction opposite to the paper feed direction by an electric motor (not shown) capable of rotating forward and backward. In this embodiment, a spring clutch means 100 is interposed between the electric motor and the paper feed roller 74. The spring clutch means 100 has a torsion coil spring 102 for transmitting the rotational driving force from the electric motor. Shaft member 8
A short cylindrical boss member 104 is fixed near one end of 6. One end of the shaft member 86 is connected to the boss member 104.
From the gear 1
06 is rotatably mounted. The gear 106 is integrally provided with a boss 108 extending toward the boss member 104, and the torsion coil spring 102 is mounted on the outer periphery of the boss 108 and the boss member 104. The torsion coil spring 102 has a gear 106
0 (FIG. 2), and is wound in a direction to reduce the diameter when rotated in the direction shown by FIG.
And the other end is fitted with the boss member 104. The control sleeve 112 is mounted on the torsion coil spring 102. Control sleeve 112
Is rotatable relative to the gear 106 and the boss member 104, and a locking portion 102 a provided at the other end of the torsion coil spring 102 is locked to the control sleeve 112. Although not shown, the gear 106 is drivingly connected to an output portion of the electric motor via a transmission mechanism including a gear and the like.

In connection with the control sleeve 112, a rotation preventing member 114 is further provided. In this embodiment, the other width regulating portion 80 of the support plate 72 includes
Support shaft 1 that extends outward through a frame (not shown)
16 (see FIGS. 3 to 6), and the rotation preventing member 1 is attached to an end of the support shaft 116 protruding from the frame.
14 is mounted. A claw 118 is provided at the tip of the rotation preventing member 114. Control sleeve 1
A plurality of recesses 120 are provided in a part of the circumferential surface of the control sleeve 112 in the circumferential direction, and the claw 118 of the rotation preventing member 114 engages with one of these recesses 120 to rotate the control sleeve 112. Is blocked. The recess 120 may be formed substantially all around the control sleeve 112.

The rotation preventing member 114 has a substantially L-shape, and a short arc-shaped hole 122 is formed at the other end. The hole 122 has the other width regulating portion 80 of the support plate 72.
The pin 124 provided in the first position is received. Therefore, the rotation preventing member 114 is configured such that the pin 124 is positioned at one end of the hole 122 (FIGS.
5 and a pin 124 is located at the other end of the hole 122 (FIG. 5).
And a second angular position (the angular position shown in FIG. 5) located at the right end in FIG. 6).

The rotation preventing member 114 and the support plate 7
2, a bias spring 126 is interposed. The illustrated biasing spring 126 is formed of a torsion coil spring. One end of the biasing spring 126 is locked to the rotation preventing member 114, and the other end is locked to the width regulating portion 80 of the support plate 72.
The biasing spring 126 elastically biases the rotation preventing member 114 toward the second angular position. In the sheet feeding state, the rotation preventing member 114 is separated from the control sleeve 112, so that the rotation controlling member 114 is held at the second angular position, and the pin 124 contacts the other end of the hole 122, whereby the second Is prevented reliably. In the non-sheet feeding state, the rotation preventing member 11 is not used.
Since the second claw 118 engages the recess 120 of the control sleeve 112, the rotation preventing member 114 is held at the first angular position against the biasing action of the biasing spring 126, and the pin 124
Abuts on one end of the hole 122 to prevent the pivoting movement beyond the first angular position.

Next, referring mainly to FIGS.
The operation of the sheet feeding device 32 will be described.

When the recording paper 64 is supplied from the paper supply device 32, the support plate 72 is maintained in the paper supply state by, for example, the action of a bias spring (not shown). In this paper supply state, the recording paper 64 supported by the support plate 72 is pressed against the paper supply roller 74. In this sheet feeding state, the support plate 72 is pivoted from the retracted position shown in FIG. 4 in the direction opposite to the direction shown by the arrow 96, so that the rotation preventing member 114 is separated from the control sleeve 112 of the spring clutch means 100. However, this allows the control sleeve 112 to rotate. Further, since it is separated from the control sleeve 112, the rotation preventing member 114 is held at the second angular position shown in FIG. When the support plate 72 is filled with the recording paper 64, the operation portion 94 of the operation member 88 may be operated to position the support plate 72 at the retracted position. Thus, as can be understood from FIG.
A sufficient gap is created between the recording paper 64 and the recording paper 64 in the stacked state.

When the electric motor (not shown) is rotated forward in this paper feeding state and the gear 106 is driven to rotate in the direction indicated by the arrow 110, the rotation of the boss 108 of the gear 106 causes the torsion coil to rotate. The diameter of the spring 102 is reduced, and the diameter is reduced, whereby the boss portion 108 of the gear 106 and the boss member 104 are drivingly connected via the torsion coil spring 102. Thus, the torsion coil spring 102 is in the driving connection state, and the rotational driving force from the electric motor (not shown) is transmitted to the paper feed roller 74 via the spring clutch means 100, and the paper feed roller 74 is moved in the direction shown by the arrow 98. The recording paper 64 (uppermost recording paper 64) supported by the support plate 72 is supplied toward the recording paper transport path 6 (FIG. 1). When the recording paper 64 is supplied to the transport roller pair 8 in this way, the recording paper 64 is further fed downstream by the action of the transport roller pair 8. When the conveyance of the recording paper 64 by the conveyance roller pair 8 is started, the electric motor (not shown) is reversed. Thus, as will be easily understood, the diameter of the torsion coil spring 102 of the spring clutch means 100 is expanded, and the spring clutch means 100 is in the drive disconnected state. In the drive connection released state, the rotational driving force from the electric motor is not transmitted to the paper feeding roller 74, and the paper feeding roller 74 is moved in the paper feeding direction indicated by an arrow 98 by the action of the recording paper 64 being conveyed. Followed by.

When the recording paper 64 is jammed in the sheet receiving portion 62, the jammed recording paper 64 can be removed as follows. When the recording paper 64 is jammed, first, the operation unit 95 of the operation member 88 is operated in a direction indicated by an arrow (FIG. 2). Thus, the support plate 72 is pivoted about the support pin 82 provided at one end (rear end) thereof in the direction indicated by the arrow 96 (FIG. 6). When the operation member 88 is operated and held in this manner, the support plate 72 is held at the retracted position shown in FIG. 6, and the pressure-contact state between the recording paper 64 and the paper feed roller 74 is released, and the paper feed state is set.

Next, in such a state, the stacked recording papers 64 are removed from the support plate 72. In the non-paper feed state, the recording paper 64 in the stacked state is separated from the paper feed roller 74, so that the recording paper 64 can be easily removed, and the space around the paper feed roller 74 can be removed by doing so. It is greatly open.

Thereafter, the jammed recording paper 64 is pulled by the sheet receiving portion 62 in the direction shown by the arrow 132 (FIG. 2) in the front side, and upwards in FIGS. 2 and 4 to remove the jammed recording paper 64. Can be easily removed. When the support plate 72 is pivoted to the retracted position, as shown in FIG. 6, the claw 118 of the rotation preventing member 114 engages with one of the plurality of recesses 120 of the control sleeve 112, and the rotation preventing member 114 Control sleeve 11
2 is blocked. In this embodiment, the claw 118 of the rotation preventing member 114 is
0, the rotation preventing member 114 is pivoted somewhat against the action of the biasing spring 126 to move the support plate 72 from the first angular position shown in FIG. 5 to the second angle shown in FIG. Swiveled into position. Therefore, the pawl portion 118 of the rotation preventing member 114 is controlled by the control sleeve 112 with a larger biasing force.
, And the claw portion 118 of the rotation preventing member 114 and the concave portion 120 of the control sleeve 112 can be more securely engaged with each other.

In the state in which the rotation of the control sleeve 112 is prevented by the rotation preventing member 114, even if the sheet feeding roller 74 is rotated in the direction opposite to the sheet feeding direction indicated by the arrow 98, such rotation is not possible. The diameter of the torsion coil spring 102 is not reduced with respect to the driving force, and the spring clutch means 100 is in the driving connection released state. Therefore, when pulling the jammed recording paper 64, the paper supply roller 74 is rotated in the direction opposite to the paper supply direction by the recording paper 64, but the rotating force from the paper supply roller 74 causes the spring clutch unit 100 to rotate. The sheet is not transmitted to the electric motor side, and the sheet feeding roller 74 is simply driven. As a result, the paper feed roller 74 is driven by the recording paper 64 pulled for removal, and the jammed recording paper 64 can be easily removed.

Although the embodiment of the sheet feeding device according to the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. It is.

For example, in the illustrated embodiment, the support plate 72 supports the front portion of the stacked recording paper 64, but is not limited to this, and is not limited thereto. May be configured to support substantially the entirety.

[0037]

According to the sheet feeding device of the first aspect of the present invention,
Since the spring clutch is used to selectively transmit the rotational driving force from the driving motor to the paper feeding motor, the manufacturing cost of the paper feeding device can be reduced. Further, a rotation preventing member for controlling the rotation of the control sleeve of the spring clutch means is provided on the support plate. When the support plate is in the paper feeding state, the rotation preventing member is located apart from the control sleeve, the rotation of the control sleeve is allowed, and the rotational driving force from the driving motor is transmitted to the paper feeding motor. . On the other hand, when the support plate is located at the retracted position and becomes inactive, the rotation preventing member acts on the control sleeve to prevent its rotation. Therefore, in this state, the spring clutch means is in the non-drive connection state, and the rotational force of the sheet feeding roller in the direction opposite to the sheet feeding direction is not transmitted to the drive motor side. Therefore, even when the sheet receiving portion is jammed with sheet-shaped paper, the sheet feeding roller is allowed to rotate in the direction opposite to the sheet feeding direction,
This jammed sheet of paper can be easily removed by pulling it toward the near side.

Further, according to the paper feeder of the second aspect of the present invention, the rotation preventing member is mounted so as to be pivotable between the first angular position and the second angular position, and the rotation preventing member is connected to the second angular position. A displacement spring for elastically displacing toward the angular position is provided. Therefore, in a state where the rotation preventing member is separated from the control sleeve, the rotation preventing member is held at the second angular position by the action of the displacement spring. The member is pivoted to the first angular position, whereby the rotation preventing member acts elastically on the control sleeve by the action of the displacement spring, so that rotation of the control sleeve can be reliably prevented.

Further, according to the paper feeder of the third aspect of the present invention, since the operating member is provided on the supporting plate, the operating plate can be operated to operate the operating member to easily position the supporting plate at the retracted position. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing an example of a facsimile provided with an embodiment of a sheet feeding device according to the present invention.

FIG. 2 is an exploded perspective view showing a sheet feeding device provided in the facsimile of FIG. 1;

FIG. 3 is a side sectional view showing a part of the sheet feeding device of FIG. 2 in a sheet feeding state.

FIG. 4 is a side sectional view showing a part of the sheet feeding device of FIG. 2 in a non-sheet feeding state.

FIG. 5 is a partially enlarged side view showing a rotation preventing member and a component related thereto in a non-paper feeding state.

FIG. 6 is a partial enlarged side view showing a rotation preventing member and a component related thereto in a paper feeding state.

[Explanation of symbols]

 2 Apparatus housing 32 Paper feeder 62 Sheet receiving part 66 Sheet receiving member 72 Support plate 74 Paper feed roller 88 Operating member 100 Spring clutch means 102 Torsion coil spring 104 Boss member 106 Gear 108 Boss part 112 Control sleeve 114 Rotation preventing member 126 Displacement Spring

Claims (3)

[Claims] A sheet receiving portion for receiving the sheet-shaped paper; a support plate for supporting the sheet-shaped paper; and a sheet-shaped paper supported by the support plate. A paper feed roller for feeding the paper toward the transport path, wherein the support plate is in a paper feed state where the supporting sheet is pressed against the paper feeding roller; The paper feed roller is selectively held in a non-paper feed state separated from the paper feeder, is positioned at the retracted position in the non-paper feed state, and the paper feed roller is drivingly connected to a drive motor via a spring clutch means. A torsion coil spring that transmits the rotational driving force from the drive motor to the paper feed roller by reducing the diameter, and a control sleeve for controlling the reduction in diameter of the torsion coil spring, The support plate further includes a rotation preventing member for preventing rotation of the control sleeve, and the rotation preventing member is separated from the control sleeve when the support plate is in the paper feeding state. When the support plate is located at the retracted position, the rotation preventing member acts on the control sleeve, thereby preventing the rotation of the control sleeve. 2. The support member according to claim 1, wherein said rotation preventing member is pivotally movable between a first angular position and a second angular position rotated from said first angular position in a direction approaching said spring clutch means. A biasing spring mounted on the plate and elastically biasing the rotation preventing member toward the second angular position is interposed between the rotation preventing member and the support plate. When separated from the control sleeve, the anti-rotation member is held in the second angular position by the action of the biasing spring, and, when the anti-rotation member acts on the control sleeve, the rotation preventing member rotates against the biasing spring. A blocking member is held in said first angular position;
2. The sheet feeding device according to claim 1, wherein the rotation preventing member elastically acts on the control sleeve. 3. The paper feeder according to claim 1, wherein the support plate is provided with an operation member for turning the support plate toward the retreat position.