JPS6239416B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder in a copying machine, and more particularly to an automatic document feeder that automatically feeds documents repeatedly during repeat copying.

2. Description of the Related Art An automatic document feeder is known that sequentially feeds documents set on a document table one sheet at a time to a copying machine. When using this automatic document feeder,
Copies can be obtained in the order in which the originals set on the original table are stacked, so if a stack of originals is repeatedly set on the document table and copies are made repeatedly,
A plurality of copy bundles are obtained in the order in which the originals are stacked, and the work of sorting the copies becomes easier than when each original is repeatedly copied one by one. However, in this case, each time the copying of one set of originals is completed, the set of originals must be manually reset on the original table, and it is not possible to copy the required number of copies completely automatically without the need for human intervention. I couldn't.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of conventional automatic document feeders, an object of the present invention is to provide an improved automatic document feeder that can completely automatically copy a predetermined number of copies without requiring any human intervention. It is said that

According to the present invention, this purpose is achieved by providing a first document placement table that supports a stack of documents, and a document feeder that feeds the documents set on the first document placement table one by one from the topmost document. A paper device, a second document placing table that sequentially holds the originals after copying and stacking them in alignment, and the entire document stack on the first document placing table is transferred onto the second document placing table. a document detecting unit configured to output a document recirculation signal based on the document recirculation signal; and a document conveyor for sending the document stack on the second document placement table toward the first document placement table based on the document recirculation signal. The device is disposed between the device, the first document placing table, and the second document placing table, and is configured to invert the document bundle sent by the conveying device and transfer it to the first document placing table. This is achieved by an automatic document feeder in a copying machine which is equipped with a reversing guide means for guiding.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 of the accompanying drawings is a schematic longitudinal sectional view showing one embodiment of a copying machine, in this case, a diazo type copying machine, equipped with an automatic document feeder according to the present invention. In the figure, reference numeral 1 indicates the main body of the copying machine. A translucent printing cylinder 3 having a light source 2 inside is provided inside the copying machine body 1, and this printing cylinder 3 rotates counterclockwise in the figure around its own axis. ing. A part of the outer periphery of the baking cylinder 3 is in contact with a part of the endless conveying belt 8 that is stretched between the rollers 4, 5, 6, and 7.
The endless belt 8 and the baking cylinder 3 are driven in synchronization with each other in the same direction. A polymer of an original and photosensitive paper is conveyed between the printing cylinder 3 and the endless belt 8, and the photosensitive paper is exposed through the original while being conveyed along the outer periphery of the printing cylinder 3. There is.

Further, inside the copying machine body 1, there is a pair of shifting rollers 9 rotating at different circumferential speeds to mutually shift the polymerization of the original and the photosensitive paper, and a pair of shifting rollers 9 for separating the original and the photosensitive paper from each other. A separation roller device 10 is provided. The separating roller device 10 separates the photosensitive paper from the original and deflects the advancing direction of the paper in a direction as shown by the symbol C in the figure. 11, the sheet is sent to a roller type developing device 12, is developed as it passes through this roller type developing device 12, and placed on a copy receiver 14 by a pair of paper ejection rollers 13.

Further, the original separated from the photosensitive paper by the separation roller device 10 advances in the direction indicated by reference numeral B in the figure and is ejected out of the machine by a pair of original ejection rollers 15. . Further, a document detection switch 16 is provided at the portion of the pair of document discharge rollers 15 for detecting that the document has passed through the portion.

In the figure, reference numeral 20 indicates an automatic document feeder according to the present invention attached to a diazo type copying machine.
This automatic document feeding device 20 is a first document placing table 2.
1. In this embodiment, the first document mounting table 21 can be selectively positioned between a position shown by a solid line and a position shown by a broken line in the figure. During automatic feeding, it is held at the position shown by the solid line in the figure. An air suction type original separating device 22 is provided above the original placing table 21 . The air suction type document separating device 22 has a suction box 24 equipped with a suction fan 23 therein, and a plurality of suction holes 26 are formed in a bottom plate 25 of the suction box 24. The suction box 24 also has a delivery roller 27 that projects downward from the bottom plate 25. This delivery roller 27 is rotated in the direction of the arrow by an electric motor not shown. Further, a document feed roller 28 and a separation roller 29 are provided at the tip of the document table 21, and these rollers are each driven to rotate in the direction of the arrow by an electric motor. The coefficient of friction of the surface of the document feeding roller 28 is made larger than that of the separation roller 29. The document placing table 21 has the document placing table 2.
A document detection switch 30 is provided for detecting whether or not there is a document on the paper. This document detection switch 30 and the document detection switch 16 constitute a document detection means, and
When it is detected that all the upper originals have been transferred onto the second original mounting table 36, an original recirculation signal is output.

The original sent out by the original placing table 21 is transferred to a pair of registration rollers 32 by a pair of paper feed rollers 31.
It is now being sent to. A document detection switch 33 is provided midway along the document conveyance path between the paper feed roller pair 31 and the registration roller pair 32 to detect passage of the document.

The automatic document feeding device 20 also includes a photosensitive paper storage section 34.
The photosensitive paper stored in the photosensitive paper storage section 34 in a stacked state is transferred to the photosensitive paper feeding roller 3.
5, the rollers are sent out toward the pair of registration rollers 32 from the uppermost one.
The photosensitive paper feeding roller 35 is started when the original detection switch 33 detects passage of an original.

Further, the automatic document feeder 20 has a second document placement table 36 that receives the document discharged outside the machine by the pair of document discharge rollers 15. A document transport path 41 is defined between the second document placing table 36 and the first document placing table 21 by document guide plates 37, 38, 39 and a reversing guide plate 40. has been done. The document conveyance path 41
is provided with an endless transport belt 44 that is stretched between rollers 42 and 43, and this endless transport belt 44 directs the original on the second original placing table 36 toward the first original placing table 21. It is designed to be transported by hand. Further, presser rollers 45 and 46 are provided above each of the rollers 42 and 43. A gate element 4 is provided in the middle of the document conveyance path 41.
7 is provided, and this gate element 47 is located at a position where it crosses the document transport path 41 and prevents passage of the document, as shown by a solid line in the figure, and at an upper position, as shown by a broken line in the figure. It can be flipped up and selectively placed in a position that allows the document to pass through. Further, a switching lever 48 is provided in the middle of the document transport path 41, and this switching lever 48
can be selectively located at a position shown by a solid line or a position shown by a broken line in the figure. When this switching lever 48 is in the position shown by the solid line in the figure, the original on the second original placing table 36 is directed toward the first original placing table 21 along the original conveying path 41. On the other hand, when the switching lever 48 is in the position shown by the broken line in the figure, the original on the second original placing table 36 is directed to the third original placing table 50 via the roller pair 49. It is now being transported. Further, a document detection switch 51 is provided at the roller pair 49 to detect the passage of a document. In addition, a second document mounting table 36 shown in FIG.
The latter half of the document is inclined backward in the document ejection direction. Therefore, roller pair 1
The originals sent out one after another onto the second document stacking table 36 in Step 5 are moved backward along the inclination, so that their trailing edges are brought into contact with the rear plate of the second document mounting table 36, and the entire stack of originals is aligned. Become.

Next, the operation of the apparatus constructed as described above will be explained.

The operator places the stack of documents on the first document mounting table 2.
1, with the original side facing upward, in the predetermined page order. When setting the original, the first original placing table 21 may be brought to the position shown by the broken line. When the stack of originals is set on the first original placing table 21 as described above,
The document detection switch 30 is connected to the first document placement table 2.
1. Detects that there is a document on top. When the start switch is operated thereafter, the fan 23 of the air suction type document separating device 24 rotates, blowing air in the direction of the arrow, and generating negative pressure within the suction box 24. Due to this negative pressure, the uppermost one of the originals on the first original document mounting table 21 is attracted to the bottom plate 25 thereof. The sucked original is given a feeding force by the sending roller 27, and is sent between the original feeding roller 28 and the separating roller 29. Document feeding roller 28 and separation roller 29
and rotate in the directions indicated by the arrows, and the coefficient of friction on the surface of the document feed roller 28 is made larger than that of the separation roller 29, so if two documents are fed overlapped between these two rollers, Even if the uppermost original is sent out, the lower original is returned to the upper part of the first original placing table 21. When the document passes through the pair of paper feed rollers 31 and the leading edge of the document is detected by the document detection switch 33, the driving force is cut off to the document feed roller 28 and separation roller 29, allowing them to rotate freely. becomes. Further, at the same time as the document detection switch 33 detects the leading edge of the document, the photosensitive paper feeding roller 35 rotates a certain amount in the direction of the arrow, and the photosensitive paper storage section 3 is placed with the photosensitive surface facing upward in advance.
Feed out one sheet of photosensitive paper set at 4. The original and the photosensitive paper have their leading ends aligned with each other at a portion indicated by reference numeral A in the figure, and are conveyed between the endless belt 8 and the printing cylinder 3 by a pair of registration rollers 32. The original and the photosensitive paper are superimposed on each other and sandwiched between the printing cylinder 3 and the endless belt 8, and are fed along the outer periphery of the printing cylinder 3 by both of them. exposed to light. The overlapping original document that has been printed and the photosensitive paper pass through a pair of separating rollers 9, and then are separated from each other by a separating roller device 10, and the photosensitive paper is conveyed in the direction indicated by symbol C in the figure. After being reversed by the reversing guide plate 11, the sheet is sent to a roller type developing device 12, is developed as it passes through this roller type developing device 12, and is then transferred onto the copy receiver 14 by a pair of discharge rollers 13. It will be placed. Further, the original advances in the direction indicated by the symbol B in the figure, is ejected out of the machine by the original ejection roller pair 15, and is placed on the second original placing table 36. Also, before this, the trailing edge of the document is detected by the document detection switch 3.
3, the document feed roller 28 and the separation roller 29 are driven to rotate again, the next document is sent out, and the above-described process is repeated. In this manner, the originals on the first original placing table 21 are sequentially fed and stacked on the second original placing table 36. When all the originals on the first original placing table 21 have been fed, the original detection switch 30
By detecting this, the rotation of the fan 23 is stopped, and the rotation of the document feeding roller 28 and separation roller 29 is also stopped. After this, the document ejection roller pair 1
When the passage of the last document is confirmed by the document detection switch 16 provided in the section 5, a signal to recirculate the document is output, the roller 42 is driven to rotate in the direction of the arrow, and the endless transport belt 44 is rotated. It will now run in the direction indicated. At about the same time, the gate element 47 is flipped up from the position shown by the solid line in the figure to the position shown by the broken line in the figure, and the presser roller 45 falls to the position shown by the broken line. do. As a result, the bundle of originals stacked on the second original placing table 36 is transferred as it is to the original transport path 41 by the endless transport belt 44.
Proceed from the right to the left in the diagram. This document bundle is gripped by the presser roller 46 which is driven by the endless transport belt 44, and is then reversed by the reversing guide plate 40 and sent onto the first document mounting table 21. , the first document mounting table 21
It is set on top in the same state as when it was initially set.

When the document stack is set on the first document placement table 21 again in this way, the document detection switch 30 detects this and the fan 23 resumes rotation, and the document feeding roller 28 and separation roller 29
start rotating. As a result, the originals on the first original placing table 21 are fed one by one to the copying machine starting from the top one, and after printing is completed, they are placed on the second original placing table 36 in order.

In this case, by controlling the number of times the document bundle is recirculated from the second document placement table 36 to the first document placement table 21, the required number of copies can be made. When the required number of document recirculation is completed, the switching lever 48 provided in the middle of the document transport path 41 moves from the position shown by the solid line in the figure to the position shown by the broken line in the figure. When all the documents are discharged onto the second document table 36, the bundle of documents passes through the roller pair 49 and is discharged to the third document table 50, and all operations are completed. do. The original detection switch 51 is for detecting the completion of ejection of this original.

Incidentally, if it is desired to manually feed the original, the original may be fed from the feeder table 20a. At this time, the gate element 47 and the switching lever 48 are respectively positioned at the positions shown by the broken lines,
Further, the endless conveyor belt 44 is kept in a conveying state.

FIG. 2 is a schematic diagram showing the main parts of another embodiment of the automatic document feeder according to the present invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. In such an embodiment, the second document table 36 is rotatable about the shaft 36a between a position as shown by a solid line and a position as shown by a broken line in the figure. It's summery. The second document placement table 36 has a notch 52 on its tip side.
A portion of the endless conveying belt 44 enters into the notch 52 when the second document placing table 36 is at the position shown by the broken line in the figure.

In this case, when the document detection switch 16 detects the passage of the last document, the second document table 36, which has been in the position shown by the solid line, moves to the position shown by the broken line in the figure. Then, a part of the endless conveying belt 44 comes to be located within the notch 52 thereof, and the document on the second document placing table 36 comes into contact with the endless conveying belt 44. At this time, the detection switch 53 is actuated by the document stack on the second document placement table 36, so that the roller 43 is rotationally driven in the direction indicated by the arrow.
The endless conveyor belt 44 now runs in the direction of the arrow. As a result, the document stack on the second document placing table 36 is placed on the endless conveying belt 44, conveyed from the right to the left in the figure, and is reversed by the reversing guide plate 40, and then Original table 21
returned to the top. When the stack of originals passes, the detection switch 5
3 returns, the second document mounting table 36 returns to its original position as shown by the solid line in the figure.

FIG. 3 shows an example of a drive mechanism for the second document table 36. As shown in FIG. One end of an arm 54 is fixed to the shaft 36a of the second document table 36,
A cam follower 55 is provided at the tip of the arm 54. The cam follower 55 engages with an eccentric cam 57 that is driven to rotate around a shaft 56, thereby rotating between a position as shown in solid lines and a position as shown in broken lines in the figure. It's becoming like that. The arm 54 also has a spring 58.
It is flexibly pressed against the eccentric cam 57 by a spring force. The shaft 56 is stopped at the maximum displacement position and the minimum displacement position of the eccentric cam by a control device (not shown) including a switch 59. Second document mounting table 36 shown in FIG.
When receiving the original after copying, it is tilted upward toward the front, so that the rear edge of the original discharged onto the mounting table is aligned.

In the above-described embodiment, the presence or absence of the original on the first original placing table 21 is detected, and it is detected that all the originals have been moved to the second original placing table 36, and then the original stack is restarted. If the number of originals to be set is known in advance, the number of originals is counted by the original detection switch 33 using a preset type counter as the original detection means, and when the set number of originals is reached, the number of originals is set. may be recirculated. or,
The document detection means uses a timer circuit to detect that the document is not fed out from the first document table even after a certain period of time has elapsed, and the document is recirculated based on the document recirculation signal from the device. You may also do this. In short, according to the invention:
After all the originals on the first document tray are fed out and all the documents are stacked on the second document tray, the originals on the second document tray are directed toward the first document tray. The recirculation of the document may be controlled by any means provided that the document is sent out.

In addition, two embodiments have been described as a structure in which the originals on the second original placing table are conveyed toward the first original placing table. Other structures may be used as long as they are sent out to a mounting table. Furthermore, although the optimal layout location for the second document placement table is at the portion of the copying machine's document ejection roller pair, it may also be provided at a location other than this, or at a location with an accessory device interposed therebetween. good.

Further, the conveying device for conveying the document bundle from the second document placing table to the first document placing table is not limited to a belt type, but may be a roller type conveying type, an air suction type conveying type, or a clamp type conveying type. It may also be a conveyance device.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of a diazo copying machine equipped with an automatic document feeder according to the present invention, and FIG. 2 is a schematic diagram showing another embodiment of the automatic document feeder according to the present invention. FIG. 3 is a schematic diagram illustrating an example of the drive mechanism of the second document mounting table. DESCRIPTION OF SYMBOLS 1...Copying machine main body, 3...Printing cylinder, 8...Endless transport belt, 10...Separation roller device, 12...Roller type developing device, 14...Copy receiver, 15...Document discharge roller pair, 20...Document automatic feeding device, 21 ...First document placement table, 22...Air suction type document separation device, 32...Pair of registration rollers, 34...Photosensitive paper storage section, 36...Second document placement table, 41...Document conveyance path, 44...Endless conveyance belt , 50...Third manuscript table.

Claims (1)

[Scope of Claims] 1. A first document placement table that supports a stack of documents, and a document feeding device that feeds the documents set on the first document placement table one by one from the topmost document. , a second document placing table that sequentially holds the originals after copying and stacking them in alignment; a document detecting means that detects the document and outputs a document recirculation signal; a conveying device that sends the document bundle on the second document placement table toward the first document placement table based on the recirculation signal; A reversing device disposed between the first document placing table and the second document placing table, and reversing the document bundle sent by the conveying device and guiding it to the first document placing table. 1. An automatic document feeder in a copying machine, comprising a guide means. 2. The copying machine according to claim 1, wherein the copying machine is a diazo copying machine in which exposed photosensitive paper is ejected with its image side facing downward. Feeding device.