JPH03166166A - Automatic document feeding device - Google Patents

Abstract

PURPOSE:To sense certainly a left document sheet, even though its format is small, and emit alarm by furnishing an alarm means, which alarms a user of left document according to the result from judgement made by a left document judging means. CONSTITUTION:When the copying motion of a copying machine 1 is completed, motor is again rotated reversely to send a document sheet on a platen to the exhaust part 7. If there is no document sheet left at this time, an exhaust sensor 27 will never sense the tip of any document sheet before a counter for sensing of the first document sheet leading edge completes counting. To examine whether counting is completed, an exhaust admission flag shall be checked. If the exhaust admission flag checked is in setting when the exhaust sensor 27 has sensed the leading edge of document sheet, it can be judged that there is no document left, so that the motion is continued as it is. If on the contrary the exhaust admission flag is out of setting, it is judged that an eventually having existed left document sheet has already been exhausted, and the motor having operated is to be stopped.

Description

[Detailed description of the invention] The present invention relates to automatic document feeding at i-position.

[Conventional technology]

If the previous operator manually places the original on the platen without using the automatic document feeder and copies it, and then forgets the original on the platen, the next operation must be performed on a copying machine equipped with an automatic document feeder. When a user starts copying using the automatic document feeder, the misplaced document is ejected before the first document due to the operation of the automatic document feeder, so that it is mixed with the documents of subsequent operators. If a subsequent operator does not take note of this and takes away the misplaced manuscript, the previous operator will be treated as having lost the manuscript, which may cause a major problem in information management. Therefore, when using the automatic document feeder, before feeding the first document, the conveyor belt on the platen is driven the distance necessary to eject the misplaced document, and a stray sensor detects whether or not there is a misplaced document. A method has been devised to detect this, but since it takes time to set the first document on the platen, this method may result in a decrease in the number of sheets processed.

Therefore, in order to detect misplaced originals without reducing the number of sheets processed, a method is proposed in which a stray original is detected using a wandering sensor while the first original is being transported to the setting position, as disclosed in Japanese Patent Publication No. 59-13734. It is proposed in This method is automatic document feeding')! ! This method takes advantage of the fact that when the original is transported to the set position, the misplaced original is moved to the ejection section. Since the wandering sensor detects originals, the presence or absence of misplaced originals can be detected. [Problem to be Solved by the Invention] However, in the above-mentioned method of detecting a misplaced document while conveying the first document, when the document is conveyed to the set position by the automatic document feeder, the leading edge of the document must be aligned with the leading edge of the platen. There is a first type that aligns the rear edge of the document with the back edge of the platen (the edge closer to the paper feed section), and a second type that aligns the rear edge of the document with the rear edge of the platen (the edge closer to the paper feed section). In the case of the younger brother 1 type, as shown in FIG.
If there is a misplaced original PO on the conveyor belt 102, the misplaced original PO is transferred to the conveyor belt 102 while the original P1 is conveyed to the set position.
It can always be detected by the paper ejection sensor 101 installed at the ejection port. However, in the case of the second type, since the feeding amount is small, especially for small-sized originals, the misplaced original PO reaches the position of the paper ejection sensor 101 while being transported to the set position as shown in FIG. 4(b). Therefore, there is a problem that the misplaced document PO cannot be detected.

The present invention has been developed in view of the above circumstances, and is designed to accurately detect misplaced originals in an automatic document feeder of the type that sets the original with the rear edge of the original aligned with the rear edge of the platen (ga close to the paper feed section). The purpose of this invention is to provide an automatic document feeder that can warn the user when documents are mixed up or lost, thereby preventing documents from getting mixed up or being lost. [Means for Solving the Problems] The present invention includes a paper feeding device that feeds out a document on a paper feed stacker toward a platen, and a device that is provided on the platen and that feeds out the trailing edge of the document fed out by the paper feeding device. A conveyance means that sends the document to a reference position provided at the rear end of the platen and then sends it out toward the discharge stacker, an ejection path that guides the document carried out from the conveyance means to the paper ejection stacker, and a document that is placed on the ejection path. In an automatic document feed vc apparatus equipped with a discharge detection means for detecting the arrival of a document, the conveyance distance detection means detects the conveyance distance of the document conveyed by the conveyance means, and the conveyance distance detection means detects the conveyance distance of the document conveyed by the conveyance means. a misplaced original determining means for determining that there is a misplaced original before the first original if the # paper detecting means detects a discharged original when the conveyance distance reaches a predetermined value; The above object is achieved by providing a warning means for warning the user that there is a misplaced document based on the determination result of the means.

[Effect]

According to the above structure, the conveyance distance detected by the conveyance distance detection means is normally configured to reach a predetermined value immediately before the discharge detection means detects the leading edge of the first document. If there is no document left behind, the discharge detection means will detect the leading edge of the document after the conveyance distance reaches a predetermined value. However, if there is a misplaced document, the paper ejection detection means will detect the leading edge of the misplaced document before the conveyance distance reaches a predetermined value, so even if the document size is small, it is possible to detect whether there is a misplaced document or not. Can be detected.

Also, since the conveyance amount is directly measured, unlike measurement based on time, there is no effect on changes in conveyance speed. It will not be done.

Therefore,. Hara in ttS! Even if you adjust and stop scanning in step 4, you can accurately detect misplaced documents without any problems. [Example] An example of the present invention will be described below based on the drawings. FIG. 1 is a cross-sectional view showing a schematic structure of the present invention. As shown in the figure, an automatic document feeder W13 is mounted on the platen 2 (original setting section) of the image processing device, for example, the copying station 1, and can be opened and closed. installed. This automatic document feeder 3 includes 1
A paper stacker (in which you place originals with the page facing down)
document tray) 4, a separating section 5 that separates the documents set on the paper feed stacker 4 one by one and sends them onto the platen 2;
a conveyor 8lS6 that conveys the document along the platen 2; a paper discharge section 7 that reverses and discharges the document that has been conveyed above to the platen 2 by the conveyance section 6; and a paper discharge section 7 that stores the document discharged from the paper discharge section 7. It is equipped with a paper discharge stacker 8 (paper discharge tray), and a drive device and a control device shown in FIG.

Note that the paper feed stacker 4 has side edges that are movable by equal amounts in opposite directions so as to always hold the original at the center in the width direction.
An id (not shown) is provided.

The separation unit 5 includes paper feed guides 9 and 10 that form a paper feed path, a feed roller such as a pickup roller 11 that feeds out the original set in the paper feed stacker 4, and a feed roller 11 that feeds out the original set in the paper feed stacker 4, and a feed roller 11 that feeds out the original set in the paper feed stacker 4. an empty sensor 12 that detects whether or not a document has been loaded, a paper feed roller 13 that rotates in the paper feed direction, and a separation sensor that rotates in a direction that rejects subsequent documents that follow the document fed by the paper feed roller 13. roller 1
4, a registration sensor 16, and interrupted conveyance rollers, for example registration rollers 17 and 18.

As shown in FIG. 2, the paper feed roller 13 is attached to the rotating pongee 40 via a one-way clutch, so that driving force is transmitted when the pongee 40 rotates in the feeding direction. Further, the rotating shaft 42 of the big unroller 11 is supported by a pair of arms 44 whose base ends are attached to the rotating shaft 40 via a spring clutch 43. The drive of the rotating shaft 40 is transmitted to the rotating shaft 42 via the gears 58, 59, and 60.

The conveyance unit 6 includes a pair of rollers 19 and 20, a conveyance belt 21 stretched between these rollers 19 and 20, and a plurality of press rollers 22 that press the conveyance belt 21 against the platen 2 side. ．． In addition, the rotating pongee 45 of the roller 19
A gear is attached to the roller 20, and a pulley 48 is attached to the rotating pongee 47 of the roller 20.

Salary #. In the section 7, the paper output forming the paper feeding path is located at the id 23, 2.
4, a synthetic resin sheet 25 attached to the lower end of the paper feed side 24, a vinyl roller 26 attached to the paper discharge side 24 and pressed against the conveyor belt 21, and a paper discharge sensor 27. , a paper discharge roller 28 , and a plate spring 29 that is pressed against the paper discharge roller 28 .

As shown in FIG. 2, a pulley 50 is attached to the rotary pongee 49 of the discharge roller 28, and the pulley 50 is connected to the pulley 48 by a round belt 51. As shown in FIG. 2, the drive device includes a motor 30 that can freely rotate in forward and reverse directions, a bobbin 34 attached to a rotating pongee 31 of the motor 30, and a timing belt 35 that connects the pulley 32 and the bobbin 34. A first one-way rotating clutch, e.g.
A gear 38 attached to the rotating pongee 33 via a spring clamp 7, a gear 39 that meshes with the gear 38, a gear 41 that is attached to the rotating pongee 40 of the paper feed roller 13 and meshes with the gear 39, The gear 52 that meshes with the
It is attached to the rotating pongee 53 of the separation roller 14, and the gear 52
The gear 54 that engages with the gear 54, the gear 36 attached to the rotating shaft 33 via a second one-way rotation clutch, for example, a one-way clutch, and the rotation Ill of the registration roller 17.
+55, and includes a gear 56 that meshes with the gear 36, and a gear 57 that meshes with the gears 46 and 56. Although the control device is not shown, it is equipped with, for example, a microconbeater, and controls the sensors 12, 15, 16, and 27, and the copying point 1.
The motor 30 and the like are driven and controlled based on signals from the controller.

Next, the operation of this embodiment will be explained with reference to the 7-row chart in FIG.

First, when a document is set on the paper feed stacker 4, the factory sensor 12 detects the document, and the document can be automatically fed (step S1). Gear 3 8.3 9,4
1,5 2.5 The rotary pongee 40, 43 rotates forward through 4, and the arm 44 descends due to the forward rotation of the rotary pongee 40.
The pickup roller 11 comes into contact with the original. As a result, the spring clutch 43 is overloaded and slips, and the pickup roller 11 remains in contact with the document. Further, due to the forward rotation of the rotating shaft 40, the paper feed roller 13
Then, the pickup roller 11 rotates normally and sends out the document.

On the other hand, due to the rotation of the rotating shaft 53, the separation roller 14 rotates in a direction to prevent the document from being fed, and rejects the subsequent document that follows the document fed by the paper feed roller 13, and separates the document into one document.
Separate into pieces. Note that since a one-way clutch is interposed in the gear 36, when the motor 30 rotates normally, the gear 36
6 is 1, don't rotate.

Next, when the Renost sensor 16 detects the leading edge of the sent document, the motor 30 is stopped after a certain period of time (steps S3, S4). At this time, registration rollers 1 7,
18 is stopped, so the manuscript is bent and Lennost correction is performed. When the motor 30 stops, the pickup roller 11, paper feed roller 13, and separation roller 14 also stop. Then, after a certain period of time, the motor 30 starts to reverse (step 35), and at the same time, an encoder (not shown) attached to the rotating shaft of the power counter motor 30 for detecting the leading edge position of the first document provided in the microcomputer (not shown) ) starts counting the output pulses (S6),
When a certain distance has been counted (until just before the leading edge of the document reaches the wandering sensor 27), a discharge permission flag is set (step S7).

As the motor 30 reverses, the rotating pongee 40 also reverses, and the arm 4
4 rises, and the big up roller 11 separates from the document.

Then, when the 7-me 44 hits a not-shown stopper,
A load is applied to the spring clutch 37, and the gear 38 stops rotating. Therefore, the pick-up roller 11, paper feed roller 13, and separation roller 14 are stopped while the pickup roller 11 is raised by -12.

On the other hand, due to the reverse rotation of the motor 30, the rotational force of the rotating shaft 33 is transmitted to the gear 36, and is transferred to the registration roller 17 via the gear 56, 57, 46, the conveyor belt 21, and the round belt 51.
, the conveyor belt 21, and the paper feed roller 28 rotate, but when the trailing edge of the document passes through the Rennost sensor 16 and the sensor becomes O7 (step S8), the stop position setting counter provided in the microcomputer detects the encoder output pulse. starts counting (step S9), and at the same time decelerates the printer 30 to prepare for stopping the document (step S1).
0). Then, when the above-mentioned stop position setting counter completes a predetermined count, the motor 30 is stopped (step Sll, 12).

Then, when the copying operation of the copying machine 1 is completed (step S
13), reverse the motor 30 again (step S14)
, sends the 11K document on the platen to the discharge section 7.

At this time, if there is no document left behind, the paper discharge sensor 27 will not detect the leading edge of the document before the counter for detecting the leading edge position of the first document completes counting. Further, to check whether the counting is completed, just look at the discharge permission flag.

Therefore, when the paper ejection sensor 27 detects the leading edge of the document,
If the ejection permission flag is checked and set, it can be determined that there is no misplaced original, and the operation will continue as is (
Steps 815-S17).

However, if the ejection permission flag is not set, it can be determined that the misplaced original has been ejected.
By stopping the drive of the motor 30 and notifying the copier 8!1 of the occurrence of a jam using an inter 7 ace (not shown), the existence of the misplaced original is alerted by means such as an alarm sound or display. By using NII in this way, even if the misplaced original is small in size, it can be reliably detected and a warning can be issued.

In the embodiment, a case where the counter for detecting the leading edge position of the first document is counted down and the discharge sensor 27 detects the leading edge of the document before the count value reaches a predetermined value is considered to be a misplaced document. It is equivalent to incrementing the counter for detecting the leading edge position of the first original and detecting that a misplaced original exists if the paper ejection sensor 27 detects the leading edge of the original before the count value reaches a predetermined value. Further, the rotary encoder is not limited to the rotating part of the motor 30, but may be any part as long as it can detect the conveyance distance of the document.

〔Effect of the invention〕

As described above, the present invention includes a conveying distance detecting means for detecting the conveying distance of the document conveyed by the conveying means, and a conveyance distance detecting means for detecting the conveyance distance of the document conveyed by the conveyance means, and the paper ejection detection when the conveyance distance detected by the conveyance distance means reaches a predetermined value. a misplaced original determining means for determining that there is a misplaced original before the first original if the means detects a discharged original; and a misplaced original determining means for determining that there is a misplaced original before the first original; A warning means is provided to the user. Therefore, even if the misplaced document is small in size, it can be reliably detected and a warning can be issued.

Furthermore, since the conveyance distance is directly measured, unlike measurement based on time, it is not affected by changes in conveyance speed.
Therefore, even if you accelerate, decelerate, or stop scanning the document during measurement, you can accurately detect a misplaced document without any problems.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a block diagram showing the structure of the drive device, Fig. 3 is a 7-flow chart for explaining the operation of the embodiment, and Fig. 4 is a sectional view of an embodiment of the present invention. FIG. 2 is a cross-sectional view of the conveyance path to explain the problem when there is a misplaced document in the follow-up device. 1... Copy machine, 2... Platen, 3
・・Automatic document feeder, 4...Paper feed stacker, 5・
...Separation section, 6.Transportation section, 7.Sheet discharge section, 11.
・・Pickup row 2, 12・・Industrial butty sensor, l3・・Paper feed roller, 14・Separation roller, 15・
- Size detection sensor, 16 - Registration sensor, 17.
18. ・Registration roller, 21 ・Transport belt,
27. Paper ejection sensor, 28... Paper ejection roller, 30.
・Motor, 37.43・ ・Spring clutch

Claims (2)

[Claims] (1) A paper feeder that feeds the document on the paper feed stacker toward a platen, and a reference position provided on the platen to place the rear end of the document fed by the paper feeder at the rear end of the platen. a conveying means for sending out the document toward the discharge stacker after the document has been fed into the conveyance means; a discharge path for guiding the document discharged from the conveyance means to the discharge stacker; and a discharge detection means for detecting that the document has reached the discharge path. An automatic document feeder comprising: a conveying distance detecting means for detecting a conveying distance of the document conveyed by the conveying means; and a conveying distance detected by the conveying distance detecting means reaching a predetermined value. a misplaced original determining means for determining that there is a misplaced original before the first original if the paper detecting means detects a discharged original; and a misplaced original determining means for determining that there is a misplaced original before the first original; An automatic document feeder characterized in that it is equipped with a warning means for warning a user. (2) The predetermined value is a transport distance necessary for the leading edge of the first document to reach just before the discharge detection means.
Automatic document feeder as described.