JPH0486679A - Original feeding device - Google Patents

Abstract

PURPOSE:To obtain a miniaturized, light weighted, and low cost original feeding device of a simple type appropriate for use for an image reading device of a mobile original platen type such as a personal type machinery by feeding and ejecting an original with a driving device interlocked with the back and forth movement of an original platen. CONSTITUTION:While the driving of an original feeding means 30 by which an original is moved to be fed or to be ejected against a surface of an original platen 2 is carried out utilizing original platen moving force of the image reading device of the mobile original platen type, and operation timing control of original feeding, ejecting, or stopping required for the original feeding means 30 is carried out by switchover means 38 and 39, interlocked with the movement of the original platen 2. Thus, the miniaturized, light weighted, and low cost original feeding device of the simple type appropriate for use in the image reading device of the mobile original platen type such as the personal machinery can be realized, and the image reading operation can be made efficient by utilizing this.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a document feeding device. More specifically, in image writing/reading processing devices (hereinafter collectively referred to as image reading devices) such as copying devices, recording devices, and image reading devices,
The present invention relates to a document feeding device that automatically feeds and discharges a document to be copied, etc. to a document processing section such as an illumination section and a reading section.

(Prior Art) In image reading devices, the above-mentioned document feeding device is extremely effective in streamlining copying and other operations, and is capable of manual feeding, single-sheet separation automatic continuous feeding, and automatic double-sided document feeding. Various systems and mechanisms, such as a reversal refeed system, have been put into practical use.

(Problems to be Solved by the Invention) However, since these conventional document feeding devices were originally developed for image reading devices of high-end high-speed models and large models, the document feeding device itself is quite large. Since the mechanical structure is complicated and expensive, personal models are not suitable as an additional device for compact, lightweight, and low-cost image reading devices.

In addition, many of these document feeding devices use a dedicated drive source to feed the document, and in this case, it is necessary to synchronize the sequence of image formation etc. on the image reading device main body, and therefore In many cases, a method of detecting the feeding timing or the like via a communication means is adopted, or because the main body of a personal model device does not have such a communication means.

Therefore, it is currently unclear whether it is effective to apply a document feeding device to personal image reading devices in order to streamline operations such as copying, or whether there is no suitable device.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a simple, small, lightweight, and low-cost document feeding device suitable for use in an image reading device with a movable document table such as a personal model.

(Means for Solving the Problems) The present invention is a document feeding device that is attached to an image reading device with a movable document table and feeds, moves, and ejects a document relative to the document table. a drive transmission means that rotates or rotates in accordance with the movement of the drive transmission means; a document feeding means that operates in response to the rotational or rotational force of the drive transmission means to move the document relative to the document table; and a device for moving the document table. a switching means for controlling the drive direction and stop of the document feeding means by the drive transmission means to be switched to a document feeding direction state, a discharging direction state, and a stopped state in a synchronous manner at a predetermined timing point in the document table moving process; This is a document feeding device comprising the following.

(Function) That is, the In feeding device of the present invention uses the document table moving force of the document table moving type image reading device to drive the document feeding means that feeds, moves, and ejects the document with respect to the document table surface. This eliminates the need for a dedicated drive source, and the timing control of the necessary document feeding, ejection, and stopping of the document feeding means is performed by a switching device that is synchronously linked with the movement of the document table. Because of this, there is no need to provide the image reading device with a communication means for synchronization, and therefore, it is a simple, compact, lightweight, and low-cost device suitable for use in image reading devices with a movable document table such as personal models. It is possible to realize a document feeding device of this type, and by using this, it is possible to improve the efficiency of image reading work.

(Example) <Example 1> (1) Example of image reading device Fig. 3 shows an example of an image reading device with a movable document table to which the document feeding device according to the present invention can be applied (this example is a transfer type image reading device). (electrophotographic copying device).

Reference numeral 1 denotes a machine housing of the main body of the apparatus, and reference numeral 2 denotes a document table made of a transparent plate such as a glass plate, which is disposed on a top plate 3 of the machine housing 1 and is driven to reciprocate in the left-right direction a-b.

The document table 2 is normally stopped and waiting with its entire body positioned on the top plate 3 of the machine casing, as shown in FIG. 3(A). Hereinafter, this stop and standby position will be referred to as the home position.

An original 8% 0 is placed on the original table 2 with the image surface facing downward, aligned with a predetermined placement reference line, and the original pressing plate 4 is placed over the original.

Based on the copy start signal, the document table 2 is driven to move leftward from the home position a, and the right end of the document table 2 reaches approximately the center of the machine housing top plate 3 as shown in FIG. 3(B). It stops when it has moved forward a predetermined distance. This forward movement stop position is defined as the start position.

When the document table 2 is in the start position, the right edge of the document 0, which has been set and sorted on the document table in line with a predetermined placement reference line, is approximately at the center of the top plate 3 of the machine casing. The document illumination section 5 (image reading section) is in the form of a horizontally long slit that is opened in a direction perpendicular to the direction of movement, and is positioned T degrees wide.

Next, the document table 2 is driven to move backward from the start position to the right. At the same time, the document illumination lamp 6 on the apparatus main body side is turned on.

Then, as the document table 2 moves and passes the document illumination section 5 from the right end to the left end, the downward image surface of the set document 0 on the document table 2 is placed on the document table 2, which is a transparent plate, in the document illumination section 5. The illumination light is sequentially scanned from the right edge side to the left edge side, and the opposite light of the scanned document surface is sequentially incident on the short focus lens array 7.
By forming an image on the surface of the rotating photosensitive drum 8 which has been uniformly charged to a predetermined polarity and potential by the charger 9, an electrostatic latent image spread over the original image is sequentially formed on the surface of the photosensitive drum 8. It will be done.

The latent image is developed as a toner image by the developing device 10, and the toner image is transferred from the paper feed tray 13 to the paper feed roller 14, registration roller 15, etc. between the charger 11 and the photosensitive drum 8 in the transfer charger 11. The images are sequentially transferred onto paper (transfer material/recording material) that is fed at a predetermined timing.

The paper that has passed through the transfer section (image forming section) is separated from the surface of the photosensitive drum 8, is introduced into the fixing device 17 by the conveying device 16, undergoes image fixation, and is transferred to the paper ejection tray as an image-formed product (copy) by the ejection roller 18. It is discharged to 19.

The 8 surfaces of the photosensitive drum from which the paper was separated are cleaned by a cleaning device 1.
2, adhered contaminants such as residual toner are removed, the surface is made clean, the edges are turned over, and the surface is used for image formation.

The document table 2 is stopped when its left end reaches approximately the center of the top plate 3 of the machine casing after moving back a predetermined distance, as shown in FIG. 3(C). The document illumination lamp 6 is also turned off.

This backward movement stop position is defined as the back position.

The illumination scanning of the entire surface of the set document 0 is completed by moving the document table 2 from the above-mentioned start position to the back position.

When the document table 2 reaches the back position and stops, it is then switched to the forward movement drive a, and when it returns to the home position, it is stopped and remains in a standby state until the next copy start signal.

When a predetermined number of sheets are to be continuously copied (multi-copy), the reciprocating driving cycle of the document table is repeated a predetermined number of times to perform continuous copying.

The copying apparatus of this example includes a photosensitive drum 8, a charger 9, and a developing device 1.
0. The four process devices of the cleaning device 12 are collectively formed into a process cartridge that can be freely attached to and detached from the main body of the device, but since this is outside the main point of the present invention, the explanation will be omitted.

(2) Document Feeding Device FIG. 1(A) is a side view of the copying device shown in FIG. 3 above with the document feeding device according to the present invention installed, and FIG. FIG.

Reference numeral 20 denotes a horizontally long manuscript support plate which is disposed on the back side of the top plate 3 of the machine casing so as to be movable back and forth in the left-right direction of the top plate via an Accuride rail 21. are integrally attached to the movable support plate 20 and jointly supported.

Reference numeral 22 denotes a front rail having a substantially U-shaped cross section and fixed on the front side of the top plate 3 of the machine casing in parallel with the Accuride rail 21.
It is slidably received in an inwardly directed groove.

The document table support plate 20 is driven to reciprocate by a drive mechanism (not shown) such as a rack and doorion or a tension wire mechanism, so that the document table 2 integrally moves on the top plate 3 of the machine casing in the left-right direction a-
Move back and forth to b.

The original pressure bonding plate 4 (FIG. 3) has its base fixed to the original support plate 2o with screws or other fasteners, and can be freely opened and closed on the upper surface of the original support plate 2. When the feeding device is attached and used, the document pressure bonding plate 4 is removed.

30 is a document feeding roller, 31 is a shaft of the roller (a shaft integrated with the roller), 32 is a pair of front and rear bearing plates provided at the rear end side of the roller shaft 31, and as described above, the document table is After removing the document pressure bonding plate 4 from the support plate 2o, the roller shaft 31 is set in a direction substantially perpendicular to the reciprocating direction of the document table 2, and the roller 30 is brought into contact with the upper surface of the document table 2, so that the document table support 20 The bearings are mounted and supported by firmly fixing the plates 32, 32 with screws or the like.

Further, the bearing of the roller shaft 31 has a pair of front and rear first friction rollers 33 for transmitting the feeding force and a second friction roller 34 for transmitting the discharging force, which will be described later, in the shaft portion between the plates 32 and 32. This is provided through first and second one-way clutches 33 (F) and 34 (B) that transmit driving force in only one direction.

Reference numerals 35 and 35 denote shaft supports provided on the roller shaft 31 at appropriate intervals on the front and rear sides of the document feed roller 30, with the seat portion touching the document table 2 surface and extending toward the document table 2 side. Supports the protruding roller shaft part and prevents the shaft from swinging. The two shaft supports can be freely slid along the shaft 31 to adjust the spacing, so that they can also serve as a kite member for the inserted document 0, which will be described later.

The above document feeding roller 30, shaft 31, bearing plate 32, first
Friction roller 33 and one-way clutch 33 (F), second friction roller 34 and one-way clutch 34 (B),
The shaft support 35 as a whole constitutes a document feeding roller assembly.

Since this assembly is attached to the document support plate 2o, it reciprocates together with the support plate 20, that is, the document table 2.

Reference numeral 36 denotes a feed document positioning stopper provided on the document table 2, and this stopper can be attached to and removed from the document table 2 using, for example, a pressure-sensitive adhesive.

Reference numeral 37 denotes a rail support member having a substantially inverted cross section, the horizontal plate portion 37a of which is positioned in parallel above the document table support plate 20 to which the document feed roller assembly is attached as described above, and the vertical plate portion 37b. It is firmly attached and supported to the rear plate 4o of the device housing 1 with screws 41 or the like.

First and second friction rails 38 (feeding rail) and 39 (ejection rail) are provided on the lower surface of the horizontal plate portion 37a along the length of the plate, and the first friction rail 38 is used for feeding originals. In correspondence with the first friction roller 33 of the roller assembly, the second friction rail 39 corresponds with the second friction roller 34.

In the above configuration, the original feed roller 3o or the original 1/i4
Feeding means, first and second friction rollers 33, 34, drive transmission means, one-way clutches 33 (F), 34 (B
) and the first and second FIGS. 2-2 are operation process diagrams of this document feeding device.

■Figure: The document table 2 is in a standby state at the home position. The first and second friction rollers 33 and 34 are in a non-contact state with respect to the corresponding first and second friction rails 38 and 39, separated from the ends of each rail.

In this standby state, slide the original go on the document table from the right end side of the document table 2 with the image surface facing downward, insert the leading edge of the document into the contact area between the document table 2 and the document feed roller 30, and hold it in your mouth. Let it happen.

Figure 2: When the document table 2 is driven forward from the home position to the left in response to the copy start signal, the first friction roller 33 comes into contact with the lower surface of the first friction rail 38, and the document table 2 As it moves forward, it receives a rotational force in the clockwise direction in the drawing due to contact with the first friction rail 38. Here, the first
The one-way clutch 33 (F) of the first friction roller 33 is for transmitting drive for clockwise rotation, and the clockwise rotation of the first friction roller 33 is transmitted to the shaft 31 via the one-way crack 33 (F). The document feeding roller 3o is rotated in the clockwise direction F.

Then, the inserted original 0 is fed to the left on the original platen 2 by the rotational force of the original feeding roller 30 in the clockwise direction F.

■Figure: When the Hara-Kandai 2 moves forward to the start position a, the document 0 is fed to the left on the document table 2 by the clockwise rotation F of the document feed roller 30. The tip side on the feeding side abuts against the stopper 36, and the receiver is stopped and positioned. In this state, the document 0 is located at the right side of the document 0 opposite to the stopper 36 side or at the base line on the right end side of the document table 2.

The peripheral speed of rotation of the document feeding roller 30 is set such that a predetermined length of the inserted document is fed to the above-mentioned predetermined state position on the document table 2 until the document table 2 finishes moving from the home position to the start position. Set the needle so that the circumferential speed is sufficient to

(2) The document table 2 that has reached the start position is then rotated to the backward moving drive. During this backward movement process of the document table, the first friction roller 33 receives a counterclockwise rotational force due to contact friction with the first friction rail 38, but the one-way clutch 33(F) Since it rotates idly, the counterclockwise rotational force of the first friction roller 33 is not transmitted to the shaft 31, the document feed roller 30 is kept in a rotational stopped state, and the document 0 is placed on the document table 2 as described above. The document is held at a predetermined feeding position by a document feeding roller 30.

Then, at the same time as the document table 2 is driven backward, the document illumination lamp 6 is
is lit, and the downward image surface of the original s40 on the document table 2 is illuminated and scanned sequentially from the right edge side to the left edge side as the document table 2 moves backward in the document illumination section 5. Image formation is performed.

(2) Figure: The illumination scan for the entire length of the document 0 is completed before the document table 2 moves backward to a position that approximately corresponds to the home position.

■Figure: Haraakidai 2 continues to move backwards, but when it continues to move backwards to a position that almost corresponds to the home position, it returns to the first position.
The friction roller 33 passes through the right end of the first friction rail 38 and comes off, cutting the edge, and then the second friction roller 34 contacts the lower surface of the second friction rail 39 and the subsequent return of the document table 2 is caused. As it moves, it receives a rotational force in the counterclockwise direction due to contact friction with the second friction rail 39. Here, the one-way clutch 34 (B) of the second friction roller 34 is for transmitting drive in the counterclockwise direction, and the rotational force of the second friction roller 34 in the counterclockwise direction is transmitted to the one-way clutch 34 (B).
B) is transmitted to the shaft 31, and the document feeding roller 3o is rotationally driven in the counterclockwise direction B.

The document 0 on the document table 2 is ejected and conveyed to the right on the document table 2 by the rotational force of the document feed roller 3o in the counterclockwise direction B.

■Figure: The document 0 is ejected and conveyed to the right on the document table by the rotational force of the document feed roller 3o in the counterclockwise direction B.
A subsequent return movement causes the second friction roller 34 to pass the right end of the second friction rail 39 until it disengages and the edge is severed. By this point, the rear edge of the document 0 in the direction of the discharge and conveyance force has reached the contact portion between the document table 2 and the document feed roller 30.

(2) Figure: The document table 2 continues to move backward until it reaches the hack position.

The document table 2 that has reached the back position is driven forward by a
It returns to the home position shown in Figure 0 and enters the standby state.

In the process of returning to the home position, the second friction roller 34 or the second friction rail 39 comes into contact again, and a clockwise rotational force acts on the second friction roller 34, but the one-way clutch 34 (B) rotates idly in its rotational direction, so the clockwise rotational force of the second friction roller 34 is not transmitted to the shaft 31, and the document feed roller 30 is kept in a rotationally stopped state, and the document 0 The document returns from Figure 2 to the state shown in Figure 0, with the rear end side in the direction of the discharge conveyance force being located at the contact portion between the document table 2 and the document feeding roller 3o and being sandwiched therebetween.

If only one copy is to be made, the first original is inserted into the right end side of the original table 2 which has returned to the indicated position as shown in Fig. 0. The original 0 that was discharged and conveyed in the set state is removed, and the next original is inserted.

In addition, when continuously copying a predetermined number of sheets, document 0 is left as it is, and the reciprocating drive cycle of the document table 2 shown in Figures 0 to 0 above and the accompanying feeding/ejection movement cycle of document 0 are determined as follows. The edges are flipped a number of times and continuous copying is performed.

The document feeding device of this embodiment is designed to feed small-sized documents, such as postcards and business cards, which are frequently used in personal image forming/processing devices. During the backward movement process from the start position (Fig. 0) to the back position (Fig. 0), illumination scanning of the original is completed in the front end (Figs. Of course, these sizes can be set in various ways depending on the specifications of the main body, and the first and second friction rollers 3
3 and 34 and the diameter of the first and second friction rails 3.
By changing the length, etc. of 8.39, it is possible to handle various models and paper sizes.

Further, in this embodiment, a stopper 36 is provided on the document table 2, and the document is positioned by abutting the leading edge of the document H40 in the feeding direction against the stopper 36 (Fig. 3). As shown in FIG. 4, the document positioning is performed by tilting the document feeding roller 30 at a small angle α (2 to 3 degrees) with respect to the direction orthogonal to the document feeding direction, and using the stopper ruler 636 on two right-angled sides.
The position may be determined by abutting both sides of a and 36b. 42 indicates a universal joint portion. In this case, the shaft supports 35, 35 are removably attached to the surface of the document table 2 using a pressure sensitive adhesive or the like, if necessary.

<Embodiment 2> Figure 5 shows another example of the configuration of the document feeding device, in which (A) is a partially cutaway side view, (B) is a partially cutaway plan view, and (B) is a partially cutaway side view. Figure (C) is a partially cutaway front view. Example 1
Components and portions common to those shown in FIGS. 1 to 4 are designated by the same reference numerals and will not be described again.

In this embodiment, the shaft 31 of the document feeding roller 30 is located at approximately the center in the left-right direction of the front plate and the rear plate of the copying apparatus main body housing 1, with the upper portion thereof protruding upwardly from the surface of the document table 2. °
The bearings are freely rotatably supported between a pair of opposing bearing plates 43 and 45 on the front and back sides, which are attached with screws 44 and 46, respectively. The document feed roller 30 is brought into contact with the top surface of the document table 2, and the document illumination section 5 located approximately in the center of the top plate 3 of the machine casing.
It is located correspondingly.

First and second friction rails 38 and 39 are provided in parallel on the upper surface of the movable document support plate 20 along the longitudinal direction of the plate.
The friction rail 38 has a length corresponding to approximately the entire length of the document table support plate 20, and the second friction rail 39 has a position and length corresponding to approximately the left half.

First and second friction rollers 33 and 34 are connected to the rear end side of the shaft 31 of the document feeding roller 30, respectively, using a one-way clutch 33.
(F) ・34 (B) The first friction roller 33 corresponds to the first friction rail 38 and is always in contact with the upper surface of this rail 38. The second friction roller 34 corresponds to the second friction rail 39, and when the document table 2 is stopped and waiting at the home position, the second friction roller 34 corresponds to the right end of the second friction rail 39 as shown in FIG. 5(B). It is located in a position where the edges are cut away from the body.

47 and 48 are the front and back bearing plates 43 and 4, respectively.
The first and second document trays are stably supported by support rods 47a and 48a between the document trays 5 and 5, and are disposed on the left and right sides of the document feed roller 30, respectively. First document tray 4
Reference numeral 7 denotes a tray that slopes forward and downward toward the contact portion between the document feeding roller 30 and the document table 2, and a second document tray 48
On the other hand, the tray is inclined upward from the contact portion toward the front. A document squeezing sheet 49 is provided at the edge of the second document tray 48 on the document feed roller 30 side, and the leading end of the sheet 49 is brought into contact with the upper surface of the document table 2 .

FIGS. 6-6 are diagrams showing the operation process of this document feeding device.

(2) Figure: The document table 2 is in a standby state at the home position. In this standby state, the original O is placed on the first original tray 47 with the image facing downward, and the leading edge is inserted into the contact area between the original feeding roller 30 and the original platen 2 and held in the mouth.

(2) Figure: Based on the copy start signal, the document table 2 is moved forward a to the left from the home position and reaches the start position.

During the forward movement process of the document table 2, the first friction roller 33 receives a clockwise rotational force due to contact friction with the first friction rail 38 that moves forward together with the document table 2. The one-way clutch 33 (F) of the friction roller 33 is for transmitting drive for counterclockwise rotation, and therefore, for the clockwise rotation of the first friction roller 33, the first friction roller 33 idles on the shaft 31 and is connected to the shaft 31. Since no rotational force is transmitted, the document feeding roller 30 is maintained in a stopped state, and the document 0 on the first document tray 47 is also moved, and the original set state is maintained.

■Figure: The document table 2 that has reached the start position is then turned into a backward movement drive, and at the same time the document illumination lamp 6
lights up.

During this backward movement process of the document table 2, the first friction roller 33
It receives a counterclockwise rotational force due to contact friction with the first friction rail 38 that moves backward together with the document table 2, and that rotational force is transmitted to the shaft 31 via the one-way clutch 3.3 (F). As a result, the document feeding roller 30 is rotationally driven in the counterclockwise direction F. The counterclockwise direction F of this document feeding roller 30
Due to the rotation of the document 0 on the first document tray 47 side, the second document is transferred from between the document feed roller 30 and the document table 2 to the upper path of the pick sheet 49 at the same speed as the backward movement speed of the document table 2. It is fed onto the tray 48.

That is, since the original illumination unit 5 is located below the original feeding roller 30, the fed original is sequentially illuminated and scanned in a panning mode (original feeding).

■Figure: Before the document table 2 reaches the hack position, the document feeding on the first document tray 47 side, that is, the illumination scanning of the document is completed, and the document O moves to the second document tray 47 side. are doing.

From the point in time when the document table 2 is returning from the start position shown in Figure ■ to the back position shown in Figure 0, the second friction rail 3
9 corresponds to the second friction roller 34, and a counterclockwise rotational force acts on the second friction roller 34, but the one-way clutch 34 (B) of the second friction roller 34 rotates clockwise. , and therefore the second
Regarding the counterclockwise rotation of the friction roller 34, the shaft 31
By idling on the shaft 31, the second friction roller 34
rotational force is not involved.

Figures 0 and ■, when the document table 2 reaches the H/T position, it is switched to the forward movement drive a, returns to the home position, and enters the standby state, or the document table 2's forward movement drive, the movement process. Then, a clockwise rotational force is received by the contact friction with the second friction roller 34 or the second friction rail 39, and the rotational force is transmitted to the shaft 31 via the one-way clutch 34 (B), and the original is fed. The feed roller 30 is rotationally driven in the clockwise direction B.

Then, as the document feeding roller 30 rotates in the clockwise direction B, the document 0 on the second document tray 48 is pulled out and ejected and conveyed to the left on the document table 2, and the document table 2 returns to the home position. Until then, the second document tray 4
The original 0 on the original 8 is ejected to the left half side of the original platen 2 (Fig. 0).

If only one copy is to be made, the document 0 returns to the home position as shown in Figure 0 and removes the document 0 discharged to the left half side of the stopped document table 2.

In the continuous copying mode for a predetermined number of sheets, the document table 2 does not stop at the home position in FIG. In the process of moving the document table 2 from the start position to the back position, the document 0 discharged onto the left side of the document table 2 is returned to the document table 2 by the rotation of the document feed roller 30 in the counterclockwise direction F. The document feed roller 30 and the document table 2 at the same speed as the moving speed.
→ The document is fed onto the second document tray 48 along the upper path of the pick sheet 49.

That is, since the original illumination unit 5 is located below the original feeding roller 30, the fed original is subjected to the second illumination scan in the form of a panning shot.

By the time the original platen 2 reaches the back position, the illumination scan for the entire length of the original fI 140 has been completed (
Figure 0), by switching the document table 2 to forward motion a, ■Figure 0
The document ejection operation shown in the figure is performed.

The above document feeding/ejecting movement cycle is repeated a predetermined number of times to perform continuous copying.

The present invention is not limited to the first and second embodiments; for example, the friction rollers 33, 34 and the friction rails 38, 39 may be pinions and racks, or the rollers 33, 34, 3
0 can be in the form of a rotating belt body, etc., and the document feeding/discharging direction, speed, and switching control timing can be designed and set as appropriate depending on the conditions of each apparatus.

(Effects of the Invention) As explained above, according to the present invention, the drive device that moves in conjunction with the reciprocating movement of the document table allows the document to be easily fed and ejected, and the timing of the document feeding and ejection is synchronized. There is no need to provide a control means or communication means for the document feeding and ejection of documents using a simple mechanism, so the work efficiency of personal image reading devices can be improved by using the document feeding device. This is now possible.

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the apparatus, in which FIG. 1A is a side view and FIG. 1B is a partially cutaway plan view. Figure 2 ■ to ■ are operation process diagrams. Figure 3 shows an example of an image reading device with a movable document table, in which (A) is a longitudinal cross-sectional view, and (B) and (C) show the document table in the start position and hack position, respectively. Moved state diagram. FIG. 4 is a plan view of an example in which the document feeding roller shaft is tilted. Figure 5 shows the device of the second embodiment, in which (A) is a partially cutaway side view, (B) is a partially cutaway plan view, and (C) is a partially cutaway side view. Front view. Figure 6 ■ to ■ are operation process diagrams. 2 is a reciprocating document table, 5 is a document illumination unit, 3o is a document feeding roller, 33 and 34 are friction rollers, 33(F) and 33(
B) is a one-way clutch, 38 and 39 are friction rails,
O is the manuscript.

Claims (1)

[Claims] (1) A document feeding device that is attached to an image reading device with a movable document table and feeds, moves, and ejects the document relative to the document table, and is a drive that rotates or rotates as the document table moves. a transmission means; a document feeding means that operates in response to the rotational or rotational force of the drive transmission means to move the document relative to the document table; A document feeding device comprising: switching means for controlling the drive direction and stop of the document feeding means by the drive transmission means to be switched to a document feeding direction state, a discharging direction state, and a stopped state in a predetermined manner at a timing point;