JPS602539A - Feeder for paper sheets - Google Patents

Abstract

PURPOSE:To make paper sheets feedable surely without interruption even in case of other paper sheets being added and so on, by operating a conveying device, after a paper sheets feeding device is operated, when a detecting device detects that paper sheets remain nothing there and successively detects that paper sheets are still left behind. CONSTITUTION:An ADF control part always monitors a switch output, and when the control part detects even only once that an original O on a tray 33 is used up to nothing, it sets ''1'' to an empty plug. In time of this ''1'' state, a user adds the original O or pulls out the original O from the tray 33 during copying operation and resets whereby he judges the original O is held by a stopper 34, before operating a takeout roller 36, and makes the stopper 34 retreat beneath the tray 33, then a feed roller 35 is rotated, feeding the original O up to the takeout roller 36 and afterward this roller 36 is rotated, thus the original O is made feedable in an accurate and continuous manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sheet feeding device such as a document feeding device used in a copying machine, for example.

[Technical background of the invention]

2. Description of the Related Art Conventionally, for example, a document feeding device of a copying machine is constructed as shown in FIG. That is, first, the documents 0 are placed all at once on the inclined tray 81, and the stopper 82
hold it. Next, in order to start copying, move the r, shi, stock 82 below the tray 8I (2), and move the feed roller 8
3 and the tray 81, the document O is taken out by the take-out roller 84.
Drop and transport to the position. Next, the originals O are taken out one by one by the rotation of the take-out roller 284, and the registration rollers 85
It is sent to the conveyor belt 86 by 0 rotation, and which conveyor belt 8
At step 6, the document is conveyed onto the document table 87 of the copying machine. This take-out and conveyance is repeated until there are no more originals O on the tray 81. Note that 88 in the figure indicates the original O sent onto the original platen 87.
(, 89 is a paper ejection roller that ejects the original O ejected from the document table 87 to the paper ejection tray 90, and 9I is the exposure lamp of the copying machine Q. [Problems in the Background Art] However, , With such a document feeder, it is very difficult to use.
Since there is a limit to the number of originals O that can be placed on the tray 81 at one time, if there are many originals, the user will add the remaining originals when there is no more originals on the tray 81.
If the document O disappears even once, the stopper 82 will return to its original holding position, so the added document will be held by the stopper 82, and even if the take-out roller 84 is rotated, the document O will not stop.
is not supplied. 1. Therefore, it is necessary to restart - and υ from the very first copy start operation. Also, during supply operation,
Even if the user pulls out W and document O from the tray 81 for some reason and sets them on the tray 81 again, there is a problem that they are not supplied in the same way. This was done in consideration of the above, and its purpose is to ensure that even if the user adds paper sheets, or even if the paper sheets that have been set during the feeding operation are pulled out and set again, f + t: The paper sheet feeding device of the present invention provides a paper sheet feeding device that is extremely convenient and easy to operate. [Summary of the Invention] A loading section to place the sheets, a detection means for detecting the presence or absence of paper sheets on the loading section, a sheet stopping section, and a sheet stopping section for sending the sheets from the loading section to the sheet stopping section. A paper sheet feeding means, a feeding means for taking out abrasive leaves one by one from the paper sheet stopping section and feeding them to the supplied section, and a control means for controlling the paper sheet feeding means and the feeding means. The control means operates the sheet feeding means and then the feeding means when the detecting means detects that there are no leafy objects; It is characterized by being operated.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a copying machine equipped with a sheet feeding device according to the present invention, such as a document feeder (hereinafter simply referred to as ADF). That is, 1 is a main body of a copying machine, and a document table (transparent glass plate) 2 for supporting a document is provided on the top surface of the main body 1.
An ADF 3 is provided on the document table 2 so as to be openable and closable. On the lower surface side of the document table 2, there is an exposure optical system consisting of an exposure lamp 4 that reciprocates in the direction of the arrow in the figure, mirrors 5, 6, 7, a lens block 8 that is movable in the optical axis direction, and a fixed mirror 9. 10 is provided, and by optically scanning the surface of the document using the optical system 10, an image of the document is formed on the surface of the photoreceptor drum 11 (slit exposure). The photosensitive drum 11 rotates in the direction of the arrow shown in the figure, and the surface is first charged by the charging device 12.
After that, the image is exposed to slit light to form an electrostatic image on the surface, and this electrostatic image is made into a visible image by adhering toner by the developer 13, and then static electricity is removed before transfer. The lamp 14 removes static electricity.

On the other hand, the sheets P are taken out one by one from the selected upper paper feed cassette 15 or lower paper feed cassette I6 by the feed rollers 17 or 18, and guided to the registration rollers 21 through the paper guide path 19 or 20. It is guided to the transfer section 22 by registration rollers 2I. Here, the paper feed cassettes 15 and 16 are detachably provided at the lower right end of the main body 1, and one of the paper feed cassettes b) can be selected using an operation knob (not shown). Thus, the paper P sent to the transfer section 22 comes into close contact with the surface of the photoreceptor drum 11 at the transfer charger 2-3, and due to the action of the charger 23, the paper P is placed on the surface of the photoreceptor drum 11. The toner image is transferred.

The transferred paper P is electrostatically peeled off from the photoreceptor drum 11 by the action of the peeling charger 24 and transferred to the paper transport path 25.
is conveyed and sent to a heat roller 26 as a fixing device provided at the end thereof, and the rainbow transfer image is fixed by passing therethrough. After the fixing, the paper P is discharged from the main body I by the paper discharge roller 27 and guided to the tray 2'. After the transfer, the photoreceptor drum If is cleaned by the cleaner 29 to remove residual l/toner from the surface, and then roughly erased by the static elimination lamp 3θ, so that the photoreceptor drum If returns to its original condition. I'm supposed to go back.・ Is it Jki ADF? is composed of a feeding section 313 and a conveying section 32. The above-mentioned feeding section 3I feeds the original documents 0 in batch 1.
A tray 33 serves as a document placement section on which a document is placed. ? Jg manuscript placed in a.

Stopper 34, Jg, document feed roller 35 that temporarily holds
, Torifi! It has a roller sheath 36 and a registration roller 37. The tray 33 is tilted back by about 30 degrees 3iJ, so that the original placed on the tray 33 can fall to the position of the take-out roller 36 by its own weight. Further, 1. The stopper 34 is rotatable in the direction of the arrow shown in the figure, using the shaft 38 as a fulcrum, and can freely move in and out of the tray 33. When holding a document, the stopper 34 protrudes into the tray 33 and the document 0.
When the tip ψ1M of the original 0 is held and the original 0 is rotated downward by the noid 39 and retreated to the lower part of the tray 33, the holding of the document 0 is released. In this case, even after the holding of the original O is released, the stopper 34 repeats periodic rotation, applies vibration to the original O from below, and facilitates the removal of the original O. Also, the document feed roller 35 rotates in the direction of the arrow in the figure and moves in parallel with the protrusion and retraction movement of the stopper 34, and moves downward at the same time as the stopper 34 retreats below the tray 33. C1 At this time, it rolls into contact with the top of the original O which is falling under its own weight, and feeds the original 0 at the top so that it comes forward. In addition, the above-mentioned take-out row 2
Reference numeral 36 denotes a pair of rollers that rotate in opposite directions, allowing one sheet of the document O to be taken out. The registration roller 37 feeds the original O taken out by the take-out roller 236 to the C conveyance section 32 at the appropriate timing, and also corrects the skew of the original O.

On the other hand, the conveyance section 32 includes an endless belt 40 for conveying documents.
, rollers 41, 42 . on which this belt 40 is mounted. Press the above bell) (0 onto the document table 2 t'1x 43, 44
, 45, 46, a stopper 47 for temporarily holding the document O sent onto the document table 2, and a paper discharge roller 48.

The stopper 47 is rotatable in the direction of the arrow shown in the drawing with the shaft 49 as a fulcrum, and normally holds the leading edge of the original O in the state shown in the drawing, and when the stopper 47 is rotated downward by the turenoid 50, the original O
It is designed to release the held state of the tip. In addition,
51 is a tray for receiving the ejected original O, and the main body J
Fixed.

Furthermore, ADF? has a plurality of detection levers 52゜53.
54 and these detection levers 52, 53, and 54, respectively, are provided with microswitches (not shown) that are interlocked with each other. The detection lever 52 is for detecting whether or not the document O is present on the tray 33. The detection lever 53 is for detecting that the original O has been reliably fed and sent into the transport section 32. Detection lever 5
4 is for detecting that the original O has been ejected. Further, the ADF 3 is provided with a detector 55 that detects opening and closing of the transportation hs section 32.

The operation of the ADF 3 in such a configuration will be explained.

First, the documents O are placed on the tray 33 all at once. Next, in conjunction with the copying start operation, the trenoid 50 is activated to retract the stopper 47 below the document table 2, and
The belt 40 runs, and an operation to eject the original that may remain on the original platen 2 is performed. At the same time, the trenoid 39 operates to retract the stopper 34 below the tray 33, feed the document 0 on the tray 33 to the take-out row 236, and take out the document 0 by the take-out roller 36. In this case, the registration rollers 37 are in a stopped state for a certain period of time, during which time the document O is fed into the registration rollers 37 by the take-out row 236, and the skew at the leading edge is corrected. Then, when the registration rollers 37 rotate, the original O is sent to the transport section 32. Note that when the registration roller 37 starts rotating, the take-out roller 36 stops rotating and stops! 47 is returned to the holding position.

Then, the M document is sent to the transport section 32.

is conveyed by the belt 4o until it touches the stopper 47, and then stops. In this case, the belt 40 continues to run for a certain period of time from the time when the leading edge of the document 0 contacts the stopper 47, so that the document 0I7) is aligned. In this way, when document 0 is set on document table 2,
Copying of the original 0 is performed. When the copying is completed, the solenoid 50 is activated to cause the stopper 47 to retract, and the belt 4o runs to eject the copied document 0 from the document table 2. This ejected document 0 is ejected onto the tray 51 by the ejection roller 48 . During this ejecting operation, if the detection lever 52 detects document 0, the above-described document ejecting operation is repeated nine times. Also, at this time, the ejection of document 0 is detected by the detection lever 54.
When detected, the stopper 47 is returned to the holding position.

Next, examples of control p liquids for controlling the operation of the copying machine having the above configuration will be explained with reference to the block diagram shown in FIG. First, the copying machine control section 6I accepts signals from the copying switch 62 and other switches/detection section 63, controls the drive system/process system 64, the display section 65, etc., and controls the entire copying operation. It is something. This copying machine control section 61 mainly uses a microcomputer and its peripheral circuits.
It operates according to programs stored in advance in the built-in memory (ROM) and performs various controls.

The display section 65 is for displaying illustrations of various operating states, and a liquid crystal display panel as shown in FIG. 4 is used as an example. This display section 65 includes a symbol 81 indicating the outer shape of the main body I, a symbol 8 indicating the photosensitive drum 11, and a symbol 81 indicating the outer shape of the main body I.
2. A symbol 83 indicating the paper feed cassette 15, 16, a symbol 84 indicating that copying is possible, a symbol 85 indicating the ADFJ, a symbol 86 indicating that a jam has occurred in the ADFE, etc. are provided as display segments. There is.

The ADF control unit 66 controls the detector 55, a document detection switch 67 that is linked to the detection lever 52, a switch 68 that is linked to the detection lever 53, and a paper ejection switch 69 that is linked to the detection lever 54. Accepting the signal, the ADF drive motor 7I operates the solenoid 39.
50, etc., and is in charge of controlling the entire ADF. This ADF control unit 66 is also mainly composed of a microcomputer and its peripheral circuits, and operates according to a program stored in advance in a built-in memory.
Performs various controls.

Further, the motor 71 is a direct current brushless motor that can be rotated in the forward and reverse directions. Rotation of the feed row 235,
The take-out roller 236 rotates, the registration roller 37 rotates, the conveyor belt 40 runs, and the paper discharge roller 48 rotates. Furthermore, the copying machine control section 61 and the A and DF control sections 66 are connected to each other by a pass line 72.

Therefore, the ADF control unit 66 outputs the ADF' set signal ADF-8ET and the original set signal 0RG-RD.
Y, a jam signal ADF-JAM, and a machining motor stop signal λ (OT-8TP) are output, respectively, and these signals are input to the copying machine control section 61. Signal ADF
-8ET, the detector 55 is A D l! ' 3 is turned on when it detects that the transport section 32 is closed, and in this case, the copying machine control section 61 selects a program so as to have a control sequence that includes ADFE. Signal O
RG-RD Y is the detection lever 52 and switch 67
This turns on when the document 0 on the tray 33 is detected by the ADFJ.
A copying operation is performed on original document O. Signal ADF-JAM
If the original 0 is not detected by the detection lever 53 and the switch 68 within a certain period of time after the take-out roller 36 starts rotating, or if the original This is output when a jam occurs in the ADF 9, such as when the document O is not detected by the overload detection lever 54 and the switch 69. This signal A D F −J A M is
The ADF control unit 66 accepts the signals from the switches 67 and 68, and outputs the signals by determining whether the above case corresponds to the above case. The signal MOT-8TP is a command signal indicating the operating state of the ADF 3 and causing the copying machine control section 61 to start a copying operation.

On the other hand, the copying machine control section 61 outputs the document preparation signal 0RG-
8ET, an original 111 person signal 0RG-IN, and an original discharge signal 0RG-OUT are output, and these signals are respectively input to the ADF control section 66. The signal 0RG-8ET is a command signal for transporting the original O on the tray 33''2 to the take-out roller 36 and ejecting any original O remaining on the original platen 2. The signal 0RG-IN operates the take-out roller 36, the registration roller 37, and the conveyor belt 40 to send the document 0 to the document table 2 (2). The signal 0RG-OUT is a command signal for ejecting the original O present on the original platen 2 onto the tray 51.

Here, the timing at which these signals are output will be explained as follows. First, a signal 0RG-8ET is output, whereby the stopper 34 is retracted and the documents O are sent all at once to the take-out roller 36. Next, signal G
On the condition that RG=RDY is on, a signal 0RG-IN- is output every time a document is replaced. As a result, the original O is set on the original table 2. If the signal OR(-RDY
When is turned off, the signal 0RG-OUT is output and the last original O is ejected.

Note that when the signal ADI''-SET is turned off, and when the signal ADF-JAM is turned on,
Furthermore, if any abnormality occurs within the copying machine, the copying operation is interrupted. The cause of the interruption in copying operations is removed, and
□If the required number of copies have not been completed, the signal ORG -S ET is output, and the signal of?
:c-IN is repeatedly output.

Here, the timing chart when the copying machine control section 61 outputs the signal 0RG-IN is as shown in FIG. That is, when the signal 0RG-IN is output from the copying machine control unit 61, the ADF control unit 66 rotates the motor 7I, transports the original O from the take-out row 236 to the registration rollers 37, and then transports the original O from the registration rollers 37. The belt 401 is fed to the stopper 47, and after further feeding by a certain amount, the motor 71 is stopped. Here, the signal MOT-8TP rises when the motor 7I starts rotating, and falls when the motor 71 stops.
After detecting the fall 9 of the signal MOT-8TP, the exposure lamp 4 is preheated and the paper is fed from the paper feed cassette 15 or 16, and only after that does the optical system 10 start scanning the document. Therefore, even though the setting of document 0 has already been completed at the timing when the motor 71 stops, actual document scanning is delayed even after that and takes place after the period Jffiff has elapsed. Therefore, in this embodiment, as shown in FIG. 5, the fall timing of the signal MOT-8TP is set to T1, which is a predetermined time T before the stop timing T2 of the motor 71. By doing this, the copying machine control unit 61 starts preheating the exposure lamp and feeding operation when the original O reaches the stopper 47, and starts scanning the original at timing T.
The copying cycle time T3 for one document O can also be shortened by the time T in the above-mentioned example (cl).

Note that the ADF control unit 66 determines whether the leading edge of the document O is not detected by the detection lever 53 and the switch 68 even after a certain period of time has elapsed since the registration roller 37 was rotated, or if the document O is present on the document table 2. When, stopper 4
If the leading edge of the document 0 is not detected by the detection lever 54 and the switch 69 even if the conveyor belt 40 is run for a certain period of time after retracting the document 7, it is determined that there is a jam, and the signal ADF-
Output JAM. In both cases, the signal ', ADF-
The timing to output JAM is the signal MOT-8TP.
Since the falling edge of the copying machine 61 is also early, the copying machine control section 61 has not yet started the paper feeding operation, and it is possible to stop the copying machine without unnecessary copying at the time of "L".

Next, the copying machine control unit 6 for performing the operations described above.
1. The control operation of the ADF control unit 66 will be explained with reference to the flowchart shown in FIG.
2 is turned on. If it is turned on, proceed to the next step and check whether the signal 0RG-1 (DY is turned on or not. The signal Or (G -RD Y
If it is not on, it is determined that the copying is not using ADF3, and AI)F, ? The copy operation starts immediately without starting the copy operation. On the other hand, if the signal 0RG-RDY is on, it is determined that this is a copy used in the ADF3, and the signal 0RG-8ET is output. This signal Q
When RG-8ET is output, the ADF control unit 66
operates the Trenoid 39 and moves the Tesen topper 34 to the tray 3.
3 and sends the document 0 on the tray 33 to the take-out row 236. At this time, the ADF control section 66 sets the empty flag to 0''. This empty flag indicates the state of document 0 on the tray 33 and is provided within the ADF control section 66. That is, the empty flag indicates the state of document 0 on the tray 33. The ADF control unit 66 constantly monitors the output of the switch 67, and when it is detected that there is no document 0 on the tray 33 even once, it sets the empty flag to 1''. Therefore, in the standby state of the apparatus, although the tray 33 is empty, the empty flag is set to °'1.
The empty flag remains at 0'' when the stopper 34 moves in and out. Therefore, during normal use, as long as there is document 0 on tray 33, the status is 0#.

The ADF control unit 66 then waits for the signals Q RG -, IN to be output, and when they are output, proceeds to the next step and t-enrolls the empty flag. At this time, if the empty flag is "o", the motor 71 is operated to rotate the take-out row 236 to take out documents 0 one by one, and the timer A for jam detection is set. Signal MOT
-8TP is output (turned on). Next, the extraction row 236
, the registration rollers 37 are rotated, and the conveyor belt 40 is caused to run.

Next, it is checked whether timer A has timed out, and when it has timed out, it is checked whether the switch 68 is on or not. If it is not on, it is determined that a jam has occurred, and the signal ADF-J-AM' is Output. If the switch 68 is on, it is determined that the document O is being conveyed normally, and a timer B for controlling the motor rotation time and a timer C for setting the off timing of the signal MOT-8TP are set. Next, it is checked whether timer C has timed out, and if it has timed out, signal M
Turn off OT-8TP (timing TI in Figure 5)
). When this signal ΔIQjT - S T P turns off, the copying machine control section 6I turns on the exposure lamp 4 and starts the paper feeding operation. Next, the AI)F control unit 66
It checks whether or not timer B has timed out, and if it has timed out, the motor 71 is stopped and the conveyor belt 4 is stopped.
0 stops running (timing T2 in Figure 5)
. At this time, the copying machine control section 61 receives the time act signal of the timer B from the ADF control section 66, moves the optical system 1o nine times, and starts the copying operation for one document. When the copying operation is completed, the process proceeds to the next step and checks whether the signal 0RG-RDY is off. If the signal 0RG-RDY is not turned off, the document O still exists on the tray 33, so the process returns to the step of checking whether the signal 0RG-IN is output, and the next document O is fed, transported, and copied. Repeat the action.

By the way, in the empty flag checking step, if there is only one empty flag on paper 1", the user has added document O, or the tray 3 is
I pulled out original 0 from 3 and set it again x'>
, document 0 is held by stopper 3, f and λ1. The stopper 34 is retracted below the tray 73 before the take-out roller 36 is operated, and then the take-out roller 3G is operated sequentially. 1 At this time, the ADF control unit 66 sets the empty day flag to It OTT.

When this kind of behavior occurs, the user adds the manuscript O.
Or, even if the document 0 is pulled out from the tray 33 during the feeding operation and set again, the document O stopped by the stopper 34 is sent to the take-out roller 36 section and then the document O is removed from the take-out roller 3.
6 rotates, ensuring continuous supply.

In the step of checking whether the signals ORG and -RDY are off, the signal 01? , G
- If RD Y is off, it is determined that there is no document O on the tray 33, and the signal 0RG-OUT is output.
Output k. When the signal 0RG-OUT is output,
The ADF control unit 66 operates the solenoid 50, moves the stopper 47 to the lower part of the document table 2 (by retracting it), and operates the conveyor belt 40 and the paper discharge/column 48.
The last original O is ejected onto the original platen 2. This completes the entire copying operation.

In the above embodiment, a microcomputer is used as the control means, but a simple logic circuit may also be used. Furthermore, although the description has been given by taking the M of a copying machine and a document feeding device as an example, the present invention is not limited thereto. [Effects of the Invention] As detailed above, according to the present invention, the user can add paper sheets or add paper sheets during the feeding operation. To provide a paper sheet feeder that is extremely convenient and has excellent operability, which can reliably and continuously supply even if the leaves are pulled out and set again.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining a conventional document feeder, FIGS. 2 to 6 are for explaining an embodiment of the present invention, and FIG. 3 is a block diagram showing an example of a control means, FIG. 4 is a plan view showing an example of the configuration of a display section, and FIG. 5 is a timing chart for explaining the operation. , 6th
The figure is a flowchart for explaining the operation.・0...Original, 2...Original table, 3...ADF, 31
... Feeding section, 32... Conveying section, 33... Tray, 3
4...Stopper, 35...Feed low 2.36...
Take-out roller, 37... Registration roller, 39... Solenoid, 40... Conveyance belt, 52... Original detection lever, 6G... ADF control section, 67... Original detection switch, 71... ·motor. Applicant's agent Patent attorney Takehiko Suzue Figure 6

Claims (1)

[Claims] A loading section for placing a plurality of paper sheets, a detection means for detecting the presence or absence of paper sheets on the loading section, and a paper sheet stopping section;
a sheet feeding means for transporting nine sheets from the sheet placing section to the sheet stopping section; and a feeding means for taking out nine sheets one by one from the sheet stopping section and feeding them to the supplied section. and a control means for controlling the paper sheet feeding means and the feeding means, and the control means is configured to detect the presence of paper sheets when the detection means detects the absence of paper sheets and subsequently detects the presence of paper sheets. , a paper sheet supply device 0 characterized in that the paper sheet feeding means is operated after the paper sheet feeding means is operated.