JPS62111852A - Original handling device - Google Patents

Abstract

PURPOSE:To prevent accident from occurring due to an original copying being left, by starting the feed of an original copying to an exposing position under such a condition that no original copy is detected for a predetermined time downstream of the exposing position. CONSTITUTION:When an inlet sensor 3 detects an original copy set in an inlet tray 1, a motor 9 is normally rotated. Then, a discharge counter corresponding to the distance between a predetermined position on a platen 10 and an outlet sensor 13 is started, and thereafter it is checked whether the outlet sensor 13 detects an original copy or not. If an original copy is detected, it is determined that an abnormality occurs, and therefore, the copying machine is stopped. At the time when an original copy is normally discharged or when the outlet sensor 13 comes to detect no original copy, the original copy set in the inlet tray is at first started to be fed. Thus, it is possible to prevent an accident from occurring due to an original copying being left.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a document handling device that feeds a document to an exposure position and discharges the document after exposure.

[Prior Art] Generally, in an image forming apparatus such as a copying machine, a document handling device (hereinafter referred to as DF) that feeds a document to a predetermined position such as an exposure position is often used. be.

Such an F is often made optional as a supplementary device such as a copying machine, and is therefore subject to various restrictions.

For example, it is small, light silicon, and FA type, has low cost, and has functions such as shortening document exchange time as much as possible, automatic document size detection, and good document conveyance.゛Conventionally, in such devices, when a document is placed on the tray and copying is started, if there is a document left on the platen, collision between the left document and the fed document may occur, resulting in poor quality of the document. 1” - In some cases, the dispatch operation was not possible.

[L-I target] The present invention was made in view of the point allocation, and the LI point is to provide a document that can be fed and ejected properly even when there is a misplaced document. The purpose is to provide handling equipment.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a document handling device to which the present invention can be applied. In the figure, 1 is an input tray in which sheet originals are loaded, and the sheet originals 2 on the tray are loaded with the F side shown in the figure facing up (image side).The first original detection sensor (input 1) Sensor) 3 is a reflective sensor that detects the leading edge and trailing edge of the sheet document. The feed rollers 4 and 5 press against each other to sandwich and transport the original. 6
A stopper 11- prevents the document from being fed to the platen glass 1-2, and is released by the operation of the solenoid 21, allowing the document to be fed. The full-surface belt 7 is an endless belt with lJ large enough to cover the entire surface of the sheet original, and the surface is large enough to move the original fl:Ii to yf, and to swivel the platen glass 10h with vibration force to transport Itrt. It has a friction coefficient of
and are constructed to prevent slipping. 1 more
No1 output roller 1. 1 and 7 are in pressure contact with each other, and they sandwich the original document taken out four times from the platen glass 10 and feed it once. Reference numeral 13 is a reflective sensor (output 1 sensor) that detects the original at the output 11, and when the leading edge of this original is detected, -1!Full surface belt 7 and rollers 11, 1
2 (stop) 1), and then run backwards and when the output sensor 13 detects the trailing edge of the document, stop at a predetermined position. After the exposure operation is completed, the original sent by the JJI output rollers 11 and 12 is moved to 4. It is sent along the paper guide plate 14 and
l: Sequentially loaded onto the tray 17.l by the paper rollers 15 and 16 in contact with it.
Yai, surface bell I, drive roller and discharge roller 11,
15 is driven by a drive motor 19.

Next, FIG. 2 is a block diagram showing a control section of a document handling device (hereinafter referred to as DF). 30 in the figure is a well-known microcomputer (hereinafter referred to as ucOM), which is an INT
is an interrupt port to which a pulse signal from the clock generator 20 when the drive motor 19 rotates is input. The operation of the DF is controlled based on this pulse signal. A signal from the first document detection sensor 3 is input to the input port P1, and a signal from the discharged paper detection sensor 13 is input to the manual port P2.
has been entered. Also, output boat F. ~F3 to driver D based on the input signal to Le C0M30.
A forward/reverse drive signal for the drive motor 19 via I-D4;
A drive signal for the stopper 5L21 is output.

Furthermore, a DF start signal from the copying machine main body is input to the input port P3, and a copy start signal to the copying machine main body is output from the output port F4. Further, the detected document size data is output from the output boat F5 to the main body of the copying machine. The main body of the copying machine performs cassette selection, display, etc. according to this document size data.

FIG. 3 is a flowchart 1 for explaining the operation of the document handling device according to the present invention. A description will be given below according to this flowchart 1.

A document is placed on the entrance I/ray 1 while the paper feed star I/signal is being output from the copying machine main body, and when the input 11 sensor 3 detects the document (step 1), the transport motor 19 is turned on in normal rotation. Then, the roller 1 comes out from the predetermined position of the platen 10.
(1 output counter from the platen) corresponding to the distance up to 3, waits until the end of the counter, and checks whether the 111th sensor 13 detects the original (st
ep2).

There, too (if there is original detection, this means that before performing this operation, it is determined that the original left by another user on the platen glass has been successfully tJt'III), and since then this original has been detected normally. This is done by (maximum size counter) in the flow, when the count ends, the lit t1 sensor 13 is checked, and if the document is still detected, it is determined that there is an abnormality during this ejection and the device is stopped. (step 3)
. At the point when this is stopped or the above 5 step 2
When the exit sensor 13 detects no originals, it is determined that all the originals left behind in the platen have been taken out at tJl, and the feeding of the originals placed on the entrance tray 1 is started for the first time. That is, in the flow, the stopper solenoid 21 is turned on,
Start feeding paper. Then, when the first sensor 3 detects the trailing edge of the original, the size counter is started and the stopper remade 21 is turned off to prevent the next original from being continuously fed (step 4).

The document sent over the platen glass 10 passes through a predetermined position and reaches the exit sensor 13 located downstream thereof. When the output [1 sensor 13 detects the leading edge of the document, the document size is determined from the data value of the aforementioned (size counter) that counts the feeding distance. That is, as shown in FIG. 4, the true document size value is obtained by subtracting the (size count) statement from the distance from the sensor 3 to the sensor 13. Determine whether the document size is, for example, B5, A4, B4, or A3 by
Output (size value ′-j) for the body (step
5).

Then, the 11-rotation of the conveyance motor 19 is stopped at -, -[, I, and then reversed, and the document begins to move in the direction of the platen crow 1o (step 6). If the document detection of the output 1 sensor 13 is turned off, the platen glass 1 will be detected from the output 11 sensor 13.
-Predetermined position A! The motor 19 is counted up to 'I' and the motor 19 is stopped at the end Y. Then, a copy request signal is output to the main body, and the main body starts the exposure operation according to the size signal described above (step 7).

After the exposure is completed, the process moves on to ejecting the document. The paper feed start signal is output again from the main unit (step 8), and the transport motor 1
9 in the forward direction, as mentioned above (discharge count from platen)
When finished, check the exit sensor 13 (step 9). Here, the difference from the above-mentioned 5tep2.3 is that if there is no detection, the device is stopped 1-, that is, the platen 101. Since it is known that the manuscript exists in , it is determined that there is an abnormality in the manuscript. On the other hand, if the sensor is turned on, the above 5 step 3
The process waits until the exit sensor 13 detects the trailing edge of the document (step).

Then, the output [-1 sensor 13 is moved to the fifth position until the trailing edge of the document passes through.
As shown in the figure, the driving speed of the transport motor 19 is reduced to a low speed by performing known PWM driving. As a result, the amount of kick-out of the discharge rollers 15 and 16 at the time of passing the trailing edge of the document is small, and good consistency in loading can be obtained. Further, by carrying out normal conveyance at high speed and reducing the speed only for a certain period of time during publication, it is possible to minimize the time required to exchange documents without degrading the performance of the apparatus. At 5tepH, the discharge counter performs low-speed conveyance for a certain period of time, and then returns to the start.

In this way, at the start of conveyance of the DF, the platen glass-4-
The exit sensor located on the 1 side of the DF is monitored for a predetermined period of time (the time when the leading edge of the document, which is assumed to be at a predetermined position on the platen glass, arrives). If the exit sensor does not turn on at the above-mentioned timing, the entry of the original in 1-1 will be allowed, and if the exit sensor turns on, it will be assumed that there is a misplaced original and the original will not be published. By waiting until then, and then allowing manuscripts to be brought in at the entrance,
Collision between a left-behind original and a carried-in original can be prevented, allowing for good original transport.

[Effect 1] As described above, according to the present invention, even if there is a forgotten original, it is possible to output and feed a good original, thereby improving reliability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of a document handling device to which the present invention can be applied, FIG. 2 is a block diagram showing a control section of the document handling device, and FIG. 3 (a), (b), and (c) are diagrams showing the document handling device FIG. 4 is a flowchart for explaining the operation, FIG. 4 is a diagram for explaining the principle of document size detection, and FIG. 5 is a diagram for explaining PWM driving of the motor. ■---Person rotary tray 3-Each person 1-1 Sensor 7--Face belt 10-11 Platen glass 13-
--Out (J sensor 19-m-transport motor 21--
Stopper Tsuremade

Claims (3)

[Claims] (1) A device that feeds a document to an exposure position and discharges it after the exposure operation is completed, and when feeding the document to the exposure position, the document is conveyed beyond the exposure position, and then reversely transported to the exposure position. In a document handling device that is stopped at a position, when the document is fed to the exposure position, feeding of the document to the exposure position is started on the condition that the document is not detected for a predetermined period of time downstream of the exposure position. A document handling device characterized in that: (2) The document handling device according to claim 1, wherein the predetermined time is a time corresponding to a maximum document size that the device can handle. (3) In claim 1, the document handling device is characterized in that if a document is detected on the downstream side within the predetermined time, feeding of the document is started on condition that the document passes. .