JPH06118507A - Sheet carrying device - Google Patents

Abstract

PURPOSE:To provide a sheet carrying device which accurately and smoothly executes the feeding and ejecting action of a sheet original and where the safety of a carrying member is improved. CONSTITUTION:When the sheet original is supplied, a knob for moving a roller is rotated in a direction shown by an arrow (y) and a cam 26 is rotated in a direction shown by an arrow (y'). Then, a right upper roller 6b1 is moved to the position of a continuous line. Besides, when the sheet original is taken up by a carrying roll, the knob for moving a roller is rotated in a direction shown by an arrow (x) and the cam 26 is rotated in a direction shown by an arrow (x'). Then, the roller 6b1 is moved to the position of a broken line. As the result, the oblique advance or the dispersion of the leading edge position of the sheet original is prevented from occurring when it is fed and a carried film is prevented from being damaged because of the press-contact of a supply tray when the sheet original is ejected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
An overhead projector (OH that places a sheet document having information such as a graph and projects it on a screen
More particularly, the present invention relates to a sheet conveying apparatus that can be mounted in P), and particularly relates to a sheet conveying apparatus that stocks a plurality of sheet originals and efficiently conveys them to a projection position.

[0002]

2. Description of the Related Art Conventionally, an example of a sheet conveying device used for an overhead projector (OHP) device will be described with reference to FIGS. In FIGS. 8 and 9, when the sheet original 201 is placed on the supply tray 220a and its leading end abuts against the right roller pair 206a and 206b, the original detection sensor 220c detects this and the left motor 208 is driven.

The rotation of the left motor 208 causes the common roll 205a to rotate in the clockwise direction, and the transport film 2
02 and the pressing film 203 are wound up. As a result, the sheet original 201 is conveyed by the conveying film 202, the upper surface of the sheet original 201 is pressed by the pressing film 203, and is wound around the common roll 205a while being sandwiched between the films 202 and 203. At this time, the right roller pair 206a, 206b and the left roller 206c are rotated by the conveyance of the films 202, 203.

In this way, the first sheet original 20
Similarly, after the first sheet is conveyed, the second and subsequent sheet originals 2
01 is conveyed and a plurality of sheet originals 201 are wound around the common roll 205a. Then, in order to convey an arbitrary sheet original 201 among a plurality of sheet originals wound on the common roll 205a onto the reading area of the exposure unit 200,
When the right frame feed button of the remote controller 219 is pressed, the right motor 207 is driven and the transport roll 204a rotates counterclockwise to wind the transport film 202.

When the sheet original 201 is wound on the conveying roll 204a in this manner and then the sheet original 201 wound on the roll 204a is conveyed again onto the reading area of the exposure section 200, the remote controller 219 is used. When the left frame feed button is pressed, the left motor 208 drives to drive the sheet original 2
01 is transported from the transport roll 204a so as to be wound around the common roll 205a. As a result, the desired sheet original 201 can be conveyed to the reading area of the exposure unit 200.

When the sheet original 201 is fed or discharged,
The leading end of the supply tray 220a is located at the position where it abuts the transport film 202, and the sheet original 201 is fed to the transport roll 204.
When the tape is wound around a, the leading end of the supply tray 220a is at a position retracted from the transport film 202. That is, the feeding tray 220a is swung by driving the cam 220b to switch between the feeding path for feeding and discharging the sheet original 201 and the feeding path for winding.

[0007]

However, in the conventional sheet conveying apparatus, the guide of the leading end integrated with the supply tray 220a is brought into pressure contact with the conveying film 202 to feed / discharge the sheet original 201. Since a large amount of curvature is generated due to the positional relationship between the roller pair 206a and 206b forming the stretching means during feeding, the sheet document 201 is abutted inaccurately. Therefore, there is a possibility that the sheet original 201 may be skewed and the leading end position may be varied. Further, since the sheet original 201 is scooped by the guide at the time of discharging, there is a possibility that the transport film 202 may be damaged.

An object of the present invention is to solve the above-mentioned problems of the prior art, to smoothly feed and discharge sheet originals, to prevent skewing of sheet originals and variations in leading edge position, and
It is an object of the present invention to provide a sheet conveying device in which the safety of the conveying member is improved.

[0009]

A typical structure according to the present invention for achieving the above-mentioned object is that a long conveying member for conveying a sheet original and the conveying member are closely contacted on an exposure unit. And a first winding means for winding the carrying member to one side outside the reading area of the exposure section, and a winding means for winding the carrying member to the other side outside the reading area of the exposure section. A second winding means for winding, a first winding means, a driving means for driving the second winding means,
The stretching means has a roller pair on the sheet original supply side,
One of the pair of rollers is movably supported at a first position that forms a conveyance path when feeding and discharging a sheet document and a second position that forms a conveyance path when winding a sheet document. Characterize.

[0010]

In the above structure, when the second drive means is driven, the conveying member is unwound from the first winding means, and a plurality of sheet originals are placed on the conveying member to form the second winding means. Let it wind up. At this time, one of the roller pairs on the sheet document supply side, which constitutes the stretching means, is moved to the first position to perform the sheet document feeding operation. The same applies to the case of discharging the sheet document wound by the two-winding means.

Further, when the first driving means is driven, the conveying member is unwound from the second winding means and also wound around the first winding means. At this time, by moving the roller to the second position, the sheet document is wound into the first winding means. The same applies when the second driving means is driven to rewind the transport member around the second winding means.

[0012]

【Example】

[First Embodiment] Next, an overhead projector (OHP) sheet conveying apparatus using the present invention will be described with reference to FIGS.
Will be described with reference to. 1 is an external view of an OHP device using the sheet conveying device according to the first embodiment, FIG. 2 is a sectional configuration explanatory diagram of the sheet conveying device, and FIG. 3 is a drive of the sheet conveying device according to the first embodiment. 4 is an explanatory view of the system, FIG. 4 is a top view of the exposure unit, and FIG. 5 is an explanatory view of a roller moving means.

First, the overall structure of the sheet conveying device A and the OHP device according to the present invention will be described. This is to load the sheet conveying device A into the OHP device B shown by the chain double-dashed line in FIG.
The sheet original 1 for OHP used in the apparatus B is automatically sent out. That is, a plurality of sheet originals 1 are sequentially sandwiched between a conveying member 2 made of a long transparent film and a pressing member 3 made of a long transparent film, and both films 2 and 3 are first It is wound around the winding means 4 and the second winding means 5. Then, the two films 2 and 3 are brought into close contact with each other on the exposure section 101 while the sheet original 1 is sandwiched by the stretching means 6. In this state, by driving the right motor 7 as the first driving means or the left motor 8 as the second driving means to wind both films 2 and 3 around the first winding means 4 or the second winding means 5. The desired sheet original 1 is conveyed onto the platen glass 102 of the exposure unit 101 of the OHP device B. The sheet original 1 is irradiated with light from the exposure unit 101, and the transmitted light is transmitted to the arm 1
The image described on the original is enlarged and projected by projecting it on a screen (not shown) through a reflecting mirror 104 and a lens 105 which are projection means supported above by 03.

Next, the structure of each part of the sheet conveying apparatus A will be individually described. (Conveying Film and Pressing Film) The conveying film 2 and the pressing film 3 hold the sheet original 1 by sandwiching it, and are made of a transparent film which is long and wider than the width of the sheet original 1. There is.
It is preferable that this film is thin if strength is maintained,
A thickness of about 25 μm to 60 μm is preferably used.
As a material, a material having good light transmittance and stable heat resistance is preferable, and for example, a polyethylene terephthalate film or the like is preferably used.

The transport film 2 is one on which the sheet original 1 is placed, and the sheet original 1 is transported as the transport film 2 is wound up. On the other hand, the pressing film 3 presses the upper surface of the sheet original 1 on the transport film 2 to prevent the original 1 from curling and prevent the original 1 from being scratched.

Further, as shown in FIG. 4, frame marks 2a are provided at predetermined intervals at the widthwise end of the transport film 2. By detecting the frame mark 2a by a frame detection sensor, a desired document is conveyed and set on the exposure section.

(First Winding Means) The first winding means 4 winds one end of the long transport film 2 and the holding film 3 and, as shown in FIG.
Is arranged outside the reading area of the exposure unit 101. In this embodiment, as shown in FIGS. 2 and 3, the conveyor roll 4a is disposed on the right side outside the reading area of the exposure unit 101, and the conveyor film 4 is wound between the front and rear frames 9a and 9b, and the pressing film 3 is pressed. The roll 4b and the roll 4b are rotatably attached.

That is, as shown in FIG. 3, the transport roll 4a
Is a roll shaft 4a1 fixed between the front and rear frames 9a and 9b with screws or the like, and front and rear pulleys 4a2 and 4a3 rotatably mounted on the roll shaft 4a1 are press-fitted to both ends of the transport roll 4a. The transport film 2 is wrapped around the. Similarly, for the press roll 4b, the roll shaft 4b1 is fixed between the front and rear frames 9a, 9b by screws or the like, and the front and rear pulleys 4b2, 4b3 rotatably attached to the roll shaft 4b1 are press-fitted to both ends of the press roll 4b. The pressing film 3 is wound around the pressing roll 4b.

The carrying roll 4a and the pressing roll 4
The positional relationship with b is as shown in FIG.
Is on the lower side and the pressing roll 4b is on the upper side.

(Second Winding Means) The second winding means 5 winds the other ends of the long transport film 2 and the pressing film 3 and, as shown in FIG.
It is arranged outside the reading area of the exposure unit 101.
In this embodiment, as shown in FIGS. 2 and 3, the exposure unit 101
It is placed on the left side outside the reading area of the front and rear frames 9a, 9b.
A common roll 5a around which the transport film 2 and the pressing film 3 are wound is rotatably attached therebetween.

That is, as shown in FIG. 3, the common roll 5a
Is mounted by pressing the roll shaft 5b between the front and rear frames 9a and 9b with screws or the like, and pressing the front and rear pulleys 5c and 5d rotatably attached to the roll shaft 5b to both ends of the common roll 5a. The transport film 2 and the pressing film 3 are wound around 5a. A gear 5e is engaged with the rear pulley 5d, and the gear 5e meshes with the motor gear 17 to transmit the rotation from the left motor 8. The gear 5e has a built-in torque limiter and is configured so that the transmission of the driving force from the motor gear 17 is not transmitted to the rear pulley 5d at a certain torque or more.

(Tensioning means) In the tensioning means 6, the conveying film 2 and the pressing film 3 sandwiching the sheet original 1 are OHP.
The apparatus B is stretched on the platen glass 102 of the apparatus B so as to be in close contact with each other. In the present embodiment, as shown in FIGS. 2 and 3, the right roller pair is provided on the right side outside the reading area of the exposure unit 101. 6a and 6b are provided, and a left roller 6c is provided on the left side outside the reading area.

The lower right roller 6a and the left roller 6c are
As shown in FIGS. 2 and 3, the roller shafts 6a1 and 6c1 are fixed between the front and rear frames 9a and 9b with screws, and the front and rear pulleys 6a are rotatably attached to the roller shafts 6a1 and 6c1.
2, 6a3 on both ends of the lower right roller 6a, and the front and rear pulleys 6c
It is attached by press-fitting 2, 6c3 to both ends of the left roller 6c. Then, as shown in FIG. 2, the conveying film 2 and the pressing film 3 pass through the upper side of the lower right roller 6a and the lower side of the left roller 6c, so that they are tightly stretched over the exposure section 101. It is like this.

The upper right roller 6b is shown in FIG.
As shown in (b), it is rotatably attached to the elongated hole of the roller support plate 24 and the elongated holes 25 of the front and rear frames 9a and 9b, and is urged to the lower right roller 6a by the tension spring 23. By passing the transport film 2 and the pressing film 3 between the right roller pair 6a and 6b, the two films 2 and 3 are brought into close contact with each other.

(Drive System) Next, a drive transmission system for winding the transport film 2 and the pressing film 3 will be described.

The carrier film 2 and the pressing film 3
Is configured to wind the transport roll 4a around which they are wound, the pressing roll 4b, and the common roll 5a to the respective rolls by driving rotation. In the present embodiment, the transport rolls 4a and The pressing roll 4b is driven and rotated by the right motor 7 which is a stepping motor, and the common roll 5 constituting the second winding means.
a is configured to be driven and rotated by the left motor 8 which is also a stepping motor. The specific configuration will be described below.

As shown in FIG. 3, a right motor 7 is attached to the right side of the rear frame 9b. In addition, the transport roll 4
The rear pulley 4a3 press-fitted into one end of a is composed of a pulley gear, and the gear portion of the motor pulley gear 10 connected to the right motor 7 meshes with the gear portion of the rear pulley 4a3 to drive the right motor 7. Is transmitted to the transport roll 4a.

On the other hand, a torque limiter 11 is attached to one end of the roll shaft 4b1 of the pressing roll 4b, and a roll gear 12 is attached via the torque limiter 11. The roll gear 12 meshes with a transmission gear 13a. ing.
The transmission gear 13a is a one-way gear attached to a transmission shaft 13b rotatably attached to the rear frame 9b, and the transmission shaft 13b transmits the rotational force in one direction (the pressing roll 4b winds the pressing film 3). Rotation direction), the transmission shaft 13b is locked and the rotational force is transmitted to the roll gear 12. When the transmission shaft 13b rotates in the opposite direction, the transmission shaft 13b is free from the transmission shaft 13b. Therefore, the rotational force is not transmitted to the roll gear 12.

A pulley 13c is attached to the transmission shaft 13b, and the pulley 13c and the pulley portion of the motor pulley gear 10 are connected by a belt 14. As a result, the driving force of the right motor 7 is transmitted to the transmission shaft 13b, and transmitted from the transmission gear 13a to the pressing roll 4b via the roll gear 12 and the torque limiter 11.

As described above, the driving force of the right motor 7 transmits the rotational force to the conveying roll 4a and the pressing roll 4b. At this time, the rotating peripheral speed of the pressing roll 4b becomes faster than the rotating peripheral speed of the conveying roll 4a. The gear ratio is set like this. Incidentally, since the high speed is absorbed by the torque limiter 11 as will be described later, the transport film 2 and the pressing film 3 are always at the same speed with the rolls 4a, 4 respectively.
It is wound around b.

Further, as shown in FIG. 3, a brake plate 15 made of a friction member is pressed against a rear pulley 4b3 press-fitted into the pressing roll 4b by a pressing spring 16,
A brake is applied to the rotation of the press roll 4b.

On the other hand, the left motor 8 is attached to the left side of the rear frame 9b, and the motor gear connected to the motor 8 is attached.
17 is pressed into one end of the common roll 5a, and then the pulley 5d
It meshes with the gear 5e formed in. As a result, the common roll 5a is rotated by the drive of the left motor 8, and the transport film 2 and the pressing film 3 are wound up.

The operation panel 18 of the sheet conveying device A
Is provided with a remote control receiver, and is configured so that the remote controller 19 can remotely operate the drive instructions for the left and right motors 7, 8.

(Sheet Original Supplying Structure) A supply tray 20a for supplying the sheet original 1 is attached near the first winding means 4 as shown in FIG. Further, as shown in FIGS. 1 and 5, the roller moving knob 28 and the cam 26 are both fixed to the cam shaft 27, and the roller moving knob 28 is rotated in the arrow y direction at the time of feeding the sheet original, The cam 26 rotates in the y'direction shown in FIG. 5B, and the roller shaft 6b1 of the upper right roller 6b moves to the solid line position, so that the right roller pair 6a, 6b moves to the solid line position shown in FIG. 5A. Become.

Further, when the sheet original 1 is wound around the conveying roll 4a, the cam 26 is rotated in the arrow x'direction shown in FIG. 5B by rotating the roller moving knob 28 in the arrow x direction. By moving the roller shaft 6b1 of the upper right roller 6b to the position shown by the broken line Z, the right roller pair 6a, 6b becomes the broken line position shown in FIG. 5 (a).

A document detection sensor 20c is provided on the supply tray 20a. This sensor 20c is the tray 20
When the sheet original 1 does not exist on the upper side, the sensor arm stands up. When the sheet original 1 is placed, the sensor arm falls down, and the state of the arm is detected by a reflection sensor or the like not shown to detect the presence or absence of the sheet original 1. It is something to detect.

(Frame Mark Detection Configuration) Further, as shown in FIG. 2, a frame detection sensor 21 is provided between the right roller pair 6a, 6b and the transport roll 4a so as to sandwich the transport film 2. This sensor 21 is composed of a transmissive sensor,
The frame mark 2a provided at the widthwise end of the transport film 2 is detected.

The frame mark 2a is the transport film 2
Are continuously provided in the vicinity of both end portions in the lengthwise direction, and are provided at other portions at substantially the same intervals as the length of the sheet original 1. Therefore, when the transport film 2 is wound around the transport roll 4a or the common roll 5a, the position detection of the sheet original 1 can be detected by detecting the frame mark 2a by the frame detection sensor 21, and the continuous frame marks 2a can be detected. As a result, the winding end of the transport film 2 can be detected.

(Sheet Original Conveying Operation) Next, the operation of conveying the sheet original 1 by the sheet conveying device A having the above-mentioned configuration will be described.

First, the roller moving knob 22 is rotated in the direction of arrow y to move the upper right roller 6b to the feeding position, and then the sheet original 1 is placed on the feeding tray 20a, and the leading end of the sheet original 1 is placed on the right roller pair 6a ,. When it abuts against 6b, the document detection sensor 20c detects it and the left motor 8 is driven. Due to the rotation, the left roller pair 6c, 6d and the common roll 5a rotate in the clockwise direction in FIG. 2, and the transport film 2 and the pressing film 3 are wound up. As a result, the sheet original 1 is conveyed by the conveying film 2 and the upper surface thereof is pressed by the pressing film 3, so that both films 2,
It is wound around the common roll 5a while being sandwiched between the three rolls. At this time, the pair of right rollers 6a and 6b are the film 2,
It rotates following the conveyance of No. 3.

When the films 2 and 3 are wound around the common roller 5a, the transport roll 4a and the pressing roll 4b are driven to rotate so as to feed out the transport film 2 and the pressing film 3, respectively, but the right motor 7 is stopped. In addition, due to the stop torque, a rotational load is applied to the transport roll 4a, and the transport film 2 is fed in a tensioned state.

Then, the frame detection sensor 21 is used as the transport film 2.
When the frame mark 2a is detected, the driving of the left motor 8 is immediately stopped. Also at this time, since the rotation brake is applied to the transport roll 4a by the stop torque of the right motor 7 described above, the transport film 2 is not fed out by inertia and the film 2 does not sag.

On the other hand, when the pressing roll 4b rotates in the direction in which the pressing film 3 is drawn out, the transmission gear (one-way gear) 13a becomes free, so that the right motor 7
Stop torque does not act on the pressing roll 4b. However, since the brake plate 15 is pressed against the pressing roll 4b, the braking action exerts a load on the rotation of the pressing roll 4b, imparts tension to the pressing film 3 that is fed, and presses it by inertia when the rotation is stopped. The film 3 is prevented from being unrolled to prevent the film 3 from sagging.

After the first sheet original 1 has been conveyed as described above, the second and subsequent sheet originals 1 are similarly conveyed and a plurality of sheet originals are wound around the common roll 5a. When the frame detection sensor 21 detects continuous frame marks 2a during the transportation of the document, the transport film 2 fed from the transport roll 4a is the end, so that the document detection sensor 20c detects the sheet document 1 any more. However, the left motor 8 is not driven.

In order to convey an arbitrary sheet original 1 onto the reading area R of the exposure section 101 after winding a plurality of sheet originals 1 on the common roll 5a as described above, first, the roller moving knob 22 is used. Is rotated in the direction of arrow x to move the upper right roller 6b to the winding position, and then the right frame feed button of the remote controller 19 is pressed, the right motor 7 is driven and the transport roll 4a is rotated counterclockwise in FIG. And the carrier film 2 is wound up.

When the right motor 7 is driven, the transmission gear 13a
Is locked, the rotational force of the right motor 7 is also transmitted to the pressing roll 4b via the torque limiter 11. At this time, due to the setting of the gear ratio, a rotational force that rotates at a peripheral speed higher than that of the transport roll 4a is transmitted to the pressing roll 4b, but the brake of the common roll 5a that extends the pressing film 3 more than the torque of the torque limiter 11 is applied. If the force is large, the torque limiter 11 will slip. Therefore, the pressing roll 4b is always driven by the rotational peripheral speed of the transport roll 4a, and the pressing film 3 fed out from the common roll 5a is wound by the rotation of the transport roll 4a.

The common roll 5a is driven to rotate as the conveying film 2 and the pressing film 3 are fed out.
Since the left motor 8 is in a stopped state, the stop torque exerts a rotational load on the common roll 5a, and the two films 2 and 3 are fed out in a tensioned state.

Then, the frame detection sensor 21 is used as the transport film 2
When the frame mark 2a is detected, the driving of the right motor 7 is immediately stopped. Also at this time, since the rotary brake is applied to the common roll 5a by the stop torque of the left motor 8 described above, the transport film 2 and the pressing film 3 are not fed out by inertia, and the films 2 and 3 are not fed. There is no slack.

When the frame detection sensor 21 detects the frame mark 2a and stops the transport of the transport film 2 as described above, the center of the sheet original 1 in the transport direction is the exposure section 101, as shown in FIG. The interval between the frame marks 2a is set so as to be located at the center of the reading area R. This is to prevent the OHP device from enlarging the exposed image through the lens so that the periphery of the screen is dark and the image is not clearly projected.

Further, as shown in FIG. 4, since the widths of the transport film 2 and the pressing film 3 are wider than the width of the sheet original 1, even if the original 1 is set with a slight shift in the vertical direction of FIG. The original 1 does not collide with the left and right rollers 6a, 6b, 6c.

Further, when the right frame feed button of the remote controller 19 is pressed, the next sheet original 1 is similarly conveyed so as to be positioned in the reading area of the exposure section 101. The sheet original 1 that has passed through the exposure unit 101 is sequentially wound around the transport roll 4a together with the transport film 2.

Therefore, the desired sheet original 1 is exposed to the exposure unit 10.
It is possible to easily stop the frame feeding and project the original 1 in a state where the reading area 1 is reached.

Further, the remote control 19 is provided with a right fine feed button and a right continuous feed button. By these operations, the right motor 7 is finely rotated to finely feed the sheet original 1, or the right motor 7 is continuously rotated. It is also possible to continuously convey the sheet originals 1 by doing so. In the case of continuous feeding, when the frame detection sensor 21 detects the continuous frame mark 2a, the driving of the motor is automatically stopped because the transport film 2 is fed to the vicinity of the end.

When the sheet original 1 is wound on the conveying roll 4a as described above and then the sheet original 1 wound on the roll 4a is conveyed again to the reading area R of the exposure section 101, the remote controller 19 is used. When the left frame feed button is pressed, the left motor 8 is driven and the sheet original 1 is conveyed so as to be wound up from the conveyance roll 4a onto the common roll 5a. As a result, the desired sheet original 1 can be conveyed to the reading area of the exposure unit 101. When the sheet original 1 is wound from the transport roll 4a to the common roll 5a, the left fine feed and the continuous left feed can be performed by operating the remote controller 19 in addition to the left frame feed.

According to the above construction, by moving the position of the upper right roller 6b to a different position for feeding / discharging the sheet original 1 and winding operation, the sheet original 1 is smoothly fed / discharged. Further, it is possible to prevent skewing of the sheet document, eliminate variations in the leading end position at the time of feeding, and perform positioning with high accuracy. Further, by linearly setting the positional relationship between the feed tray 20a and the right roller pair 6a, 6b when the sheet original 1 is fed / discharged, it becomes possible to collect the sheet original 1 and the feed tray 20a on the conveying film 2. Since it is not necessary to press the tip of the carrier, it is possible to prevent the transport film 2 from being damaged.

[Second Embodiment] Next, another example of the sheet original supply configuration in the first embodiment will be described with reference to FIGS. 6 and 7. Since the schematic structure of the sheet conveying device is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 6, 28a and 28b are upper right rollers 6.
It is a reflection sensor that detects the position of b, and the upper right roller 6
When the position b is detected by the reflection sensor 28a, the sheet document 1 can be fed and discharged, and when detected by the reflection sensor 28b, the sheet document 1 can be wound. Each sensor is arranged as follows. The information of the reflection sensors 28a and 28b is sent to the remote controller 19 to inform the user.

When the sheet original 1 is placed on the supply tray 20a and the leading end thereof is abutted against the right roller pair 6a, 6b, the original detection sensor 20c detects this and at the same time the reflection sensors 28a, 28b are positioned at the upper right roller 6b. To detect. At this time, when the position of the upper right roller 6b is detected by the reflection sensor 28a, the left motor 8 is driven to perform the normal feeding operation.

The position of the upper right roller 6b is a reflection sensor.
If detected by 28b, as shown in FIG. 7, the cam drive motor 29 is rotated by the photo interrupter 30 for a predetermined number of clocks, and the cam 26 is rotated in the direction of the arrow y'to make the sheet ready for feeding. , The left motor 8 is driven to perform a normal feeding operation.

When the sheet original 1 is wound on the transport roll 4a, first, the cam rotation button of the remote controller 19 is used to rotate the cam drive motor 29 for a predetermined number of clocks to rotate the cam 26 in the x'direction. After the sheet original 1 is set in a windable state, the right motor 7 is driven to perform the winding operation.

The cam drive motor 29 can rotate in the forward and reverse directions, and its rotation direction is governed by the information from the reflection sensors 28a and 28b. That is, the upper right roller 6b is a reflection sensor
When it is detected by 28a, the cam drive motor 29
26 is rotated to rotate in the arrow x'direction, and when detected by the reflection sensor 28b, the cam drive motor 29 is rotated to rotate the cam 26 in the arrow y'direction. This operation is performed by the cam rotation button of the remote controller 19. Further, the remote controller 19 is provided with an ejection mode button for controlling the position of the upper right roller 6b at the time of ejection, and the operation by the ejection mode button is performed based on the information of the reflection sensors 28a and 28b. In this embodiment, the upper right roller 6b
Although the cam 26 is used as the moving means, it is not limited to this and other means such as a solenoid or a gear drive can be used.

Also with the above-described structure, the smooth feeding / discharging operation of the sheet original 1 can be realized, and the operability is improved and the malfunction is prevented.

[0063]

As described above, according to the present invention, the position of one roller of the roller pair forming the stretching means is moved to different positions during the feeding / discharging of the sheet original and the winding operation. It is possible to smoothly feed and discharge the sheet original, prevent skew of the sheet original, eliminate variations in the leading end position during feeding, and perform high-precision positioning.

Further, by linearly setting the positional relationship between the feed tray and the roller pair at the time of feeding / discharging the sheet original, it becomes possible to smoothly collect the sheet original, and the sheet feeding tray is provided on the long conveying member. Since it is not necessary to press the tip of the conveying member, the safety of the conveying member can be ensured.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of a sheet conveying device according to a first embodiment of the present invention loaded in an OHP device.

FIG. 2 is a cross-sectional configuration explanatory diagram of a sheet conveying device according to a first embodiment.

FIG. 3 is an explanatory diagram of a drive system of the sheet conveying apparatus according to the first embodiment.

FIG. 4 is a top view of an exposure unit.

FIG. 5 is an explanatory diagram showing a roller movement configuration.

FIG. 6 is an explanatory diagram of a configuration of a sheet conveying device according to a second embodiment.

FIG. 7 is an explanatory diagram showing a roller movement configuration.

FIG. 8 is a sectional configuration explanatory diagram of a conventional sheet conveying device.

FIG. 9 is an external view of a sheet conveying device loaded in a conventional OHP device.

[Explanation of symbols]

 A ... Sheet transport device B ... OHP device 1 ... Sheet original 2 ... Transport film 2a ... Frame mark 3 ... Holding film 4 ... First winding means 4a ... Transport roll 4b ... Holding roll 5 ... Second winding means 5a ... Common Roll 6 ... Stretching means 6a, 6b ... Right roller 6c ... Left roller 7 ... Right motor 8 ... Left motor 9a, 9b ... Frame 11 ... Torque limiter 12 ... Roll gear 13a ... Transmission gear 13b ... Transmission shaft 13c ... Pulley 14 ... Belt 15 ... Brake plate 16 ... Pressing spring 18 ... Operation panel 19 ... Remote control 20a ... Supply tray 20c ... Document detection sensor 21 ... Frame detection sensor 22 ... Roller movement knob 23 ... Tension spring 24 ... Roller support plate 25 ... Slot 26 ... Cam 27 ... Cam shafts 28a, 28b ... Reflection sensor 29 ... Cam drive motor 30 ... Photointerrupter 101 ... Exposure unit 102 ... Platen glass 103 ... Arm 104 ... reflecting mirror 105 ... lens

Continued Front Page (72) Inventor Kimiaki Hayakawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (5)

[Claims] 1. A long transport member for transporting a sheet document, a tensioning means for bringing the transport member into close contact with the exposure unit, and one of the transport members outside the reading area of the exposure unit. First winding means for winding to the side, second winding means for winding the conveying member to the other side outside the reading area of the exposure section, the first winding means, the second winding A driving means for driving the picking means, and the stretching means has a roller pair on the sheet original supply side,
One of the pair of rollers is movably supported at a first position that forms a conveyance path when feeding and discharging a sheet document and a second position that forms a conveyance path when winding a sheet document. Characteristic sheet conveying device. 2. The sheet conveying apparatus according to claim 1, further comprising moving means for moving one of the pair of rollers between a first position and a second position. 3. The moving means rotates a frame body, a support member having a guide hole held in the frame body, an eccentric cam rotatably attached to the support member, and the eccentric cam. 3. The sheet conveying apparatus according to claim 2, further comprising a rotating unit for rotating the sheet conveying unit. 4. A position detecting means for detecting the position of the movable roller, and an original detecting means for detecting the presence or absence of a sheet original on a sheet original stacking tray. The sheet conveying device according to claim 3, wherein the rotating means is rotated in accordance with the information of the detecting means. 5. The sheet conveying apparatus according to claim 4, wherein the rotating means is rotated according to the input information for feeding and discharging the sheet original and the information of the position detecting means and the original detecting means.