JPS62145236A - Original supply device - Google Patents

Abstract

PURPOSE:To automatically supply an original and to reduce the cost and facilitate its control by moving an original platen beyond its range of reciprocal movement, providing an original feeding means in an original conveyance path provided in the main body at an exposure position, and driving the original feeding means by the driving device in the main body. CONSTITUTION:The original platen 2 is movable to a position where its rack disengages from a driving gear 5, i.e. position outside the reciprocal movement of the original platen 2. This movement allows the slit type exposure part 6 and driving gear 5 of a copying machine to appear. The original platen 2 which moves is held while supported on the copying machine body 1 without detached from a slider 3, and an original supply device 7 is set at a specific position of the copying machine main body 1 after the original platen 2 is moved, but the original supply device 7 is driven by the driving device provided in the copying machine body 1 as a driving source. Further, the copying machine is in normal mode unless a sensor C detects the original platen 2 being outside the reciprocal movement range and switched to an ADF mode when the sensor C detects that.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feeding device that automatically feeds a document to an exposure position of a copying machine.

a document table movably installed in the copying machine body; a drive device provided in the copy machine body for reciprocating the document table; and when the document table passes through an exposure position from a predetermined direction; 2. Description of the Related Art A copying machine having an exposure means for exposing a document to light is well known and is called a so-called document table movable copying machine. This type of copying machine has the advantage of being smaller in size compared to a moving optical system type.

However, due to its mechanism, copying machines with a movable document table cannot be equipped with a document supply device. That is, since the contact glass of the document table itself moves, it is not possible to attach the document feeding device on the contact glass.

Purpose The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide a document feeding device that can be installed in a copying machine with a moving document table.

Mr. Ao-san This object is achieved by the present invention, which includes a main body that moves out of the range of reciprocating the document table and is attached above the exposure position, and a main body that is formed to pass within the main body and above the exposure position. This is achieved by having a document transport path and a document feed means for moving the document in the predetermined direction within the document transport path, and the document feed means being driven by the drive device.

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

In FIG. 1, reference numeral 1 denotes a copying machine main body of a movable document table type, and a document table 2 is mounted on the top surface of the copying machine main body 1 so as to be movable back and forth in the direction of the arrow.

In this case, a slider 3 is provided on the top surface of the copying machine main body 1,
The document table 2 is mounted so as to be movable back and forth along the slider 3. The document table 2 includes a transparent plate 4 made of contact glass on which a document is placed and a document holding plate (not shown).

The copying machine main body 1 has a built-in drive motor (not shown), and a drive gear 5 (see FIGS. 2 and 4) which is drivingly connected to the drive motor is provided near the top surface of the copying machine main body 1. ing. On the other hand, the document table 2 is provided with a rack (not shown) on its back side, and this rack meshes with the drive gear 5.

The document table 2 is reciprocated as the drive gear 5 is driven.

In this case, the drive gear 5 is reversibly reversible to reciprocate the document table 2 during copying, and this switching is controlled by turning on and off a clutch (not shown).

The explanation up to this point is almost the same as that of a conventional document moving copying machine, but the copying machine to which the present invention is applied is as follows.

As shown in FIG.
The document platen 2 can be moved to a position where it is disengaged, that is, to a position outside the reciprocating movement range of the document table 2. This movement of the document table 2 exposes the slit-shaped exposure section 6 and drive gear 5 of the copying machine. Note that the moved document table 2 is not removed from the slider 3 and is held supported by the copying machine main body 1. Further, reference numeral C is a sensor that detects that the document table 2 has been moved out of the reciprocating movement range.

Thus, after moving the document table 2, the document feeder 7 according to the present invention is set at a predetermined position, which will be described later, in the copying machine main body 1. The drive source is a drive device. The copying machine main body 1 is also equipped with a control mode (hereinafter referred to as normal mode) for reciprocating the document table 2 during normal copying, which will be described later, and a control mode (hereinafter referred to as ADF mode) for operating the document feeding device. It has a control device (not shown),
The normal mode and the ADF mode are switched by detecting the position of the document table 2 by the sensor C. That is, when the sensor C does not detect that the document table 2 is outside the reciprocating movement range, the normal mode is used.

When detected, the mode is switched to ADF mode.

Therefore, the movement of the drive gear 5 in the normal mode will be explained using the movement of the document table 2.

In Fig. 3, (A) shows the state in which the document table 2 is in the copy standby position. It shows. Here, when a copying command is issued, the driving gear 5 rotates counterclockwise, and the document table 2 moves to the left in the figure, and stops at the position shown in FIG. 3 (b). This stop position is the document exposure start position, and at this position, the document reference position P has moved to the left by a distance A from the exposure position Q. Thereafter, at the same time as the exposure operation, the rotation direction of the drive gear 5 is switched and rotated clockwise, and the document table 2 moves to the right. At this time, the moving speed of the document table 2 gradually increases.
When the document leading edge position P reaches the exposure position Q, a predetermined speed is reached that is related to the movement and speed of a photoreceptor (not shown). That is, the above-mentioned length A is provided for the run-up of the document table 2, so that when the document reference position P reaches the exposure position Q, the predetermined speed is ensured. The exposure is continued until the entire area of the document ○ passes through the exposure position Q, and eventually the document table 2 reaches the exposure end position shown in FIG. 3(C).

In this way, when the exposure of the document ○ is completed, the document table 2 moves to the left and returns to the position shown in FIG. 3 (b), then moves to the right again, returns to the standby position (a), and stops. In addition, in the case of continuous copying, after reaching the exposure end position (c) in the first copying, repeat the round trip between the exposure start position (b) and the exposure end position (c) as many times as the number of repeats. After that, waiting position @
Return to (a) and stop.

The above is the mode of operation of the document table which reciprocates due to the movement of the drive gear 5 in the normal mode.

Next, the above-mentioned document supply device will be explained.

As shown in FIG. 4, the document supply device 7 has a paper feed tray 8 on which a document to be copied is placed, and a paper ejection tray 9 on which the copied original is stocked. An M document transport path 10 is provided between them.

A calling roller 11 is disposed on the paper feed table 8 and is movable between a position in contact with the document and a position away from the document by a solenoid (not shown). Double feeding prevention means consisting of a separation roller 12 and a separation pad 13 is provided. A pair of pinch rollers 14 and an exposure roller 15 are sequentially arranged along the document transport path 10 downstream of this double feeding prevention means. The exposure roller IS is provided on a contact glass 16 provided in the original supply device 7, and
The original supply device 7 is set on the copying machine main body 1 so that the document feeder 7 is above the exposure section 6 of the copying machine main body 1. The document conveying path 10 after the exposure roller 15 curves upward to reach a paper discharge tray 9, and a pair of discharge rollers 17 is provided in front of the paper discharge tray 9.

Calling roller 11, separation roller 12, pinch roller pair 14. The exposure roller 15 and the discharge roller pair 17 are each rotated in the direction of the arrow, and this rotation is provided by the drive gear 5. In this case, the rotation transmitted from the drive gear 5 is divided into two drives (not shown), one drive is transmitted to the calling roller 11 and the separation roller 12, and the other drive is transmitted to one of the pair of pinch rollers 14. , the exposure roller 15 and the discharge roller pair 17. In addition, after dividing the drive, each one way clutch (1!I not shown)
It is equipped with a calling roller 11 and a separating roller 12.
turns on when the drive gear 5 rotates counterclockwise.

At this time, the pinch roller pair 1.4, the exposure roller 15, and the discharge roller pair 17 are turned off, slip, and do not rotate. Conversely, when the drive gear 5 rotates clockwise, the calling roller 11 and separation roller 12 are turned off, and the pinch roller pair 14, the exposure roller 15, and the ejection roller pair 17 are turned on.

Further, at least a pinch roller pair 14 and an exposure roller 15
For example, the gear ratio is adjusted so that the document conveyance speed by the pair of discharge rollers 17 matches the speed of the document table 2 during exposure. Then, from the nip of the pinch roller pair 14, the exposed portion 1i! The length up to Q is made to match the length A of the run-up described above.

The document feeding device thus configured operates as follows.

First of all, Jj? +Move the document table 2 out of the reciprocating range of the document table shown in FIG. 2 as described above. At this time, sensor C is M'
s platform 2 is detected, its movement is detected, and the control device is switched from the normal mode to the ADF mode in response to this signal.

Then, the document supply device 7 is set at a predetermined position, and the next document O is set on the paper feed table 8. At this time, when the paper discharge tray 9 is lifted by about 1.2 cm, a document stop finger 18, which will be described in detail later, protrudes above the paper feed table 8, and prevents the document from entering the interior from a predetermined position. At the same time, the solenoid is energized and the calling roller 11 is held at a position away from the document. Here, when a print button (not shown) on the main body of the copying machine is pressed, a copying command is issued, the solenoid is released by the command, the calling roller 11 rides on the original, and the original is prepared to be sent out.

When the drive gear 5 begins to rotate counterclockwise, the calling roller 11 and separation roller 12 begin to rotate in the direction of the arrow.
Move the topmost page of the manuscript forward.

At this time, the pinch roller pair 14 and subsequent ones are not rotating due to the action of the one-way clutch. Sent manuscript O
Pinch roller pair 1 is moved forward after being securely separated by the action of separation roller 12 and separation bat 13, and is stopped.
The leading edge of document 0 hits nip 4. A first sensor 19 is provided between the separating roller 12 and the pair of pinch rollers 14, and the sensor 19 detects that the document has entered the pair of pinch rollers 14, and activates the clutch and solenoid of the drive gear 5. Operate. That is, the counterclockwise rotation of the driving gear 5 is stopped, the original is stopped in a slack state, and the solenoid of the above-mentioned pick-up roller 11 is energized to be held at a separated position.

Next, when the drive gear 5 starts rotating clockwise, the pinch roller pair 14, the exposure roller 15, and the ejection roller pair 17 rotate in the direction of the arrow, and exposure starts.

First, due to the rotation of the pair of pinch rollers 14, the document inserted between them starts moving forward, and the document reaches the contact glass 16. At this time, pinch roller pair 14. The exposure roller 15 and the ejection roller pair 17 try to feed the original at the same speed as the original platen 2, but when the original 0 is sent out, it is gradually accelerated.

However, since the length between the nip of the pinch roller pair 14 and the exposure position Q is equal to the run-up length A, when the leading edge of the original O reaches the exposure position Q, the predetermined speed is reached, and the original 0 is exposed without any problem. be done.

The exposed document is sent to a pair of transport rollers 17, further fed by the pair of rollers, and discharged onto a discharge tray 9.

In this case, a second sensor 2 is located near the discharge roller pair 17.
0 is provided, and when this sensor 20 detects the rear end of the document, the normal rotation of the drive gear 5 is stopped. Furthermore, the next original is transported and copied in the same manner as above, and this operation is performed as original 0.
will be carried out as many times as

The document supply device 7 is activated, and under control in its ADF mode, the drive gear 5 is first reversed until the first sensor 19 issues a stop signal. Next, forward rotation is started and continues until the second sensor 20 issues a stop signal. Then, if the rotation is reversed again and the first sensor 19 detects the original,
The forward and reverse rotations described above are repeated, and if the first sensor 19 does not detect the original, the device stops there.

In this way, in the ADF mode of this example, the drive gear is controlled by the signals from the first sensor 19 and the second sensor 20.

The document supply device 7 can be installed in a copying machine with a moving document table, which enables automatic document feeding in this type of copying machine, and because the driving source is the drive device of the copying machine main body, the cost is extremely low.

Next, another embodiment of the present invention will be described.

In this embodiment, the control of the document supplying device 7 is further simplified, and the movement of the document table 2 in the normal mode is shown in FIG. 5 by the locus of the leading edge position JP of the document.

In Figure 5, P is at standby, P is at the start of exposure, and P
C indicates the document reference position at the end of exposure. Further, in the trajectory, a solid line indicates when the driving gear 5 rotates clockwise in FIG. 4, and a broken line indicates when the driving gear 5 rotates counterclockwise.

In this case, the m-document reference position moves in the order indicated by R, S, T, and U. At this time, the length from position 2 to exposure position Q is the length A described above, and the above-mentioned S is the movement during exposure.

Moreover, FIG. 6 shows the ADF mode in this embodiment,
This diagram illustrates the trajectory of the movement based on the assumption that if the original platen 2 were placed on the drive gear 5, how would it move? In reality, the document table 2 is removed to the position shown in FIG. 2, and is in a position where it does not mesh with the drive gear 5.

4 and 6, starting from P i, the drive gear 5 rotates counterclockwise in FIG.
7 to retrieve only one document from the paper feed tray 8.

When the first sensor 19, which is provided in the same manner as in the previous embodiment, detects the paper, the calling roller 11 and the separating roller 12 stop rotating. In this case, a clutch that is turned on and off by a solenoid (not shown) is provided in the drive transmission system of the calling and separating rollers, and this clutch is released. Therefore, the shaft of the drive gear 5 idles and rotates by R, which is the same as in FIG. Next, the drive gear 5 starts rotating clockwise. At the same time, the document feeder i! 17, a pair of pinch rollers 14, an exposure roller 15, and a pair of discharge rollers 17 rotate in the direction of the arrow to feed the original at the same speed as the moving speed of the original platen 2. In this case, S
is the length of the JM document plus the run-up length A, but in the ADF mode, it is necessary to rotate an extra distance by the distance from the exposure roller 15 to the discharge roller pair 17. Therefore, S
'' increases the clockwise time of the drive gear 5 by that much. That is, in contrast to the movement S in Fig. 5, the movement S in Fig. 6 is
' is S plus a few seconds. When the exposure is completed, the rotation is reversed in the same way as in R, and if the first sensor 19 detects an original, it moves S' again, and if it does not detect an original, it stops there.

In this way, in the ADF mode of this embodiment, in contrast to the movements R, S, T, and V in the normal mode, it is only necessary to repeat R and S for the number of original sheets, except that S' is longer than S. It is. Therefore, control of the document supply device 7 becomes easy.

Next, a method of raising and lowering the stop finger of the document supply device 7 will be explained.

In FIG. 7, the paper ejection tray 9 is rotatably attached to the side plate of the document supply device 7 (not shown) about a fulcrum B, and
Further, the paper discharge tray 9 is formed with a groove (not shown).

A small diameter portion 21a formed near the tip of the connecting rod 21 is fitted into this groove, and the connecting rod 21 is configured to move integrally with the movement of the paper discharge tray 9. A stop finger 22 is provided at the lower end of the connecting rod 21, and the stop finger 22 is attached to the side plate so as to be rotatable about a fulcrum. This stop finger 22 is biased by a spring 23 to rotate counterclockwise in the figure, but when the discharged paper 1-ray 9 is at the position indicated by the solid line, the stop finger 22 is biased by its weight. 22 is held at the position indicated by the solid line.

This solid line position is below the paper feed tray 8.

Here, when placing a document on the paper feed table 8, when the paper ejection tray 9 is lifted as shown by the chain line, the stop fingers 22 follow each other as shown by the chain lines via the connecting rod 21, and the stop fingers 22 appears on the paper feed table 8. Therefore,
The document is placed against the stop finger 22.

According to this configuration, the original can be reliably placed at a predetermined position. After placing the original, if the paper ejection tray 9 is lowered, the stop finger 22 will return to the lower part of the paper feed tray 8, and the original transport path will be opened.

Effects The document feeding device according to the present invention is configured as described above, and enables automatic document feeding in a copying machine with a moving document table.Moreover, since the driving device of the copying machine is used as the drive source, the cost is extremely low. Control is also simple.

[Brief explanation of drawings]

FIG. 1 is a plan view of a copying machine in which a document feeding device according to the present invention is installed, FIG. 2 is a plan view of a state in which the document table of FIG. 1 has been moved, and FIGS. 3(a) and (b). (c) is an explanatory diagram showing the document table moving process of the copying machine shown in FIG. 1, FIG. 4 is an explanatory diagram showing the outline of the document feeding device, and FIG. 5 is an explanatory diagram showing the trajectory of the document reference position in the shuttle mode. Explanatory diagram, No. 6
The figure is an explanatory diagram showing the locus of the document reference position in the ADF mode, and FIG. 7 is an explanatory diagram showing the stop finger up/down mechanism. 1...Copying machine main body 2...Document table 7...Document feeder main body 10...Document transport path Figure 1 (A) (B) (C) Figure 5 Figure 6

Claims (2)

[Claims] (1) A document table movably mounted on the copying machine body, a drive device provided in the copy machine body for reciprocating the document table, and when the document table passes through an exposure position from a predetermined direction,
A document feeder that can be installed in a copying machine and has an exposure means for exposing a document, the document feeder being able to move outside the reciprocating range of the document table, and having a main body mounted on the exposure position; and has an original transport path formed to pass above the exposure position, and an original transport means for moving the original in the predetermined direction within the original transport path, and the original transport means is driven by the drive device. The document feeding device is driven. (2) The document feeding device according to claim 1, wherein the speed at which the document is transported by the document feeding means and the speed at which the document passes through an exposure position from a predetermined direction on the document table are the same speed.