JPS6035755A - Jam detector - Google Patents

Abstract

PURPOSE:To prevent decrease in accuracy by providing a means for detecting a sheet provided on a moving path for the sheet, the 1st timer which starts timing operation upon receiving of the signal for the rear end of the sheet and the 2nd detecting means provided near the outlet of the moving line. CONSTITUTION:A jam detector has the 1st detecting means S1 which is provided in the inlet of a moving line and detects a copying sheet (expressed hereunder as a sheet), an integrating circuit which removes the erroneous rear end signal from the means S1, the 1st timer T1 which starts timing operation upon receiving of the signal for the rear end of the sheet and the 2nd detecting means S2 which is provided near the outlet of the moving line and detects the sheet. The detection of the 1st jam in the section before the sheet detecting means and the detection of the 2nd jam in the section after said means are made possible according to such constitution, by which the accuracy in the detection of the jam is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing jams from moving objects such as copying tools and materials to be copied.

Copy materials such as sheet 1-1, photosensitive paper, etc. In a copying machine that automatically feeds and processes a large number of sheets without much effort, sheet originals or photosensitive paper are stacked in the moving thread path. 1
Jamming due to leakage, etc. will reduce the efficiency of autofeed, and will ultimately impair the safety of the equipment.

Previously, a special public service was issued in 1974-843 to deal with paper jams in the 4 planes.
As seen in Publication No. 6, the leading edge of the paper is detected by the paper detection means provided at the end of the transportation route, and a timer is set to set the time for crushing at the exit, and the paper is sent to the exit within that time. There are devices that stop the fuser when the leading edge of the paper does not reach it.

However, if the paper has a file hole, the paper detector will detect when the paper moves from a non-hole area to a hole area or from a hole area to a non-hole area, and the paper detector will pass through the rear end. , outputs an erroneous signal when the tip passes. Therefore, this erroneous signal may cause malfunction noise during jam detection.

- To eliminate these drawbacks, divide the path of paper movement into small sections and install a paper detector and a timer for each section. A system has been proposed that detects a jam by comparing the time taken for more than one time and each timer time.

However, in this case, the number of paper detectors is increased excessively, and the number of paper detectors is 1 on multiple axes.The present invention is capable of speeding up the subsequent paper feed by t when detecting a jam in the value range using one paper detector. It is.

That is, a sheet detecting means provided on the sheet movement path, a first timer means for performing a timed operation for a first time required for the sheet to reach the sheet detecting means after the sheet is fed;
After the sheet is normally fed and reaches the sheet detecting means, the second step required for the sheet to pass through the sheet detecting means
a second timer means for performing a timed operation for a period of time; a size signal generating means for generating a signal related to the size of the sheet; and a size signal generating means for generating a signal related to the size of the sheet; a jam detection means for generating a jam signal when the sheet does not pass through the detection means even after a second time period of the second timer means has elapsed; In order to change the time, there is provided a jam detecting device comprising means for controlling a timed operation of the second timer means in accordance with a size signal from the size signal generating means.

FIG. 1 is a block diagram showing an example in which the present invention is applied to the feeding of copying materials, where SI is installed at the entrance of a moving path and is used to protrude viewing materials (hereinafter referred to as sheets). Risk 111 means,■
is an integral circuit for removing the trailing edge error signal from the first outgoing means, 'l', j is a first timer that starts a timed operation according to the trailing edge signal of the sheet, and S2 is the exit of the moving path. A second detecting means is provided nearby for protruding the sheet, J'2 is a second timer that starts a timed operation in response to a note tip signal from the second protruding means Sl, and C is a first timer '1. 7. The second detecting means S2 exposes the leading edge of the sheet within the opening 111 at a predetermined value according to 7. 2 is a second detecting means S, which produces an output when the rear end of the second detecting means S, does not detect the rear end of the second timer Trt within a predetermined time set by a second timer Trt; A discriminating means, G is a means for generating all jam signals by the output of the first or second discriminating means, yVi
Drive 80Jilr7 feeds by jam signal!
Alternatively, X is a means for cutting off the heater for fixing the sheet (fixed paper), and X is means for counting the sheets or stopping the sheets in preparation for exposure in response to the tip end signal from the first protruding means s1. Here, the first timer is set to the time required for the sheet to reach the second detection means after the trailing edge of the sheet is exposed. Therefore, the first timer time can be shortened. Further, the second timer is set to the time required for the sheet to pass through the second detection means.

Therefore, it is possible to monitor the sheet over the entire system and determine whether feeding is complete or not. When the sheet is fed, the second detection means SL is detected.
] At the same time, the first timer '■゛1 is created Md, r.
L When the second detection means 82 is reached, the timer 'J゛1
Since the jam signal is released, the jam signal is not generated, and the second timer is activated at the same time as the jam signal reaches the second detecting means S.
When it passes through, timers 1 and 2 are released, so no jam signal is generated. If a jam occurs, one of the timers outputs a jam signal, which stops the sheet feeding means and the subsequent sheets to prevent damage to important documents, or activates a warning lamp. to ensure the integrity of the equipment.

This example is based on 'r4r publication No. 49-1234, which detects the leading edge of a sheet document fed to the exposure section, temporarily stops the sheet, and when the drum reaches a predetermined position, starts feeding again and exposes the sheet. This is particularly effective in electrophotographic copying apparatuses that process and then discharge.

The timer can also be used to set the time after the copying drum or the like is rotated once a month, and the time after 11 times has elapsed.

Further, the present invention will be explained below by using as an example a copying machine shown in FIG. 2 in which a large number of stacked notebook originals are continuously fed by continuous auto-feeding.

This copying machine aims to provide Kokichi with a copying machine that can copy sheets with the highest efficiency from the standpoint of copying sheet originals. Conventionally, copying machines can be roughly divided into two types: copying machines that can copy three-dimensional objects such as books and books.

Copying machines for sheet originals that have a transport exposure section for sheet originals cannot copy thick originals such as those made of wood. You can get a copy just by entering it.

Furthermore, compared to a thick document copying machine which has a document table on which a thick document is placed, it is possible to increase the copying speed because there is no backward movement for the same process configuration due to the document table or optical system.

However, there is a limit to the speed when the user feeds the document one sheet at a time into the insertion slot, so as the performance of the machine improves, it will be possible to catch up with the speed that the machine is capable of. could not be used effectively. When copying a manuscript consisting of several pages, when the exposure is finished, the manuscript will be in the reverse order of the pages originally loaded, and the user will have to change the order, which will cause a loss of time. was there.

The present invention is an improvement on the above points, and includes a separating sheet feeding section that automatically and reliably continuously feeds notebook manuscripts one by one to the conveyance exposure section, and a U-turn stacking of sheet manuscripts in the exposure section.
It is possible to load each or both of the discharging section and the discharging section in the order of the first loaded pages, so that even if they are loaded individually, they can perform their respective functions.

Therefore, if it becomes possible to insert sheet originals at high speed, the same +
1; The page order of the manuscript is automatically arranged in 'f. This embodiment is a sheet document/book document copying machine in which a sheet document feed section is combined with a document separation/feed section and a discharge section.

The operation will be explained with reference to FIG.

Below is the process of trying to copy multiple sheet originals 1.
111, place the pages in order from the bottom, and place them on the loading table 23 with the last page on top. The RIC roller 7 and the feed roller 6, which rotate in opposite directions, separate and transport each stacked sheet document, that is, the last page of the document, and continuously pass through the drawer roller 8 onto the document table 91. The leading edge of the sheet document is sent between the built-in transport rollers 90, detected by the lamp 21 and the light receiving element 22, and is temporarily stopped. When the photosensitive drum 24 rotates to a predetermined position, the sheet document is transferred again to the transport rollers 9,
10 in synchronization with the drum 24.
．． The slit-exposed sheet document is conveyed between guide plates 7 and 7, passes through discharge rollers 11 and 12, and is discharged to a document tray 92 while making a U-turn. The conveying speed of the pull-out roller 8 is higher than that of the feed roller 6, and the trailing edge of the first sheet document 1' and the second document are separated and fed continuously and reliably by the feed roller 9. Create a gap between the tip and the tip. The second document is distinguished from the first document by this gap, and is similarly stopped and controlled in conjunction with the photosensitive drum 2/1. When the sheet original passes over the glass plate [6] of the illumination section 25, it is irradiated by a lamp 26, and the image of the original 41 is focused on the photosensitive drum 24 by the reflecting mirror 27 and mirror lens 28 at the exposure section 29. Photosensitive drum 24
The primary firefly rotates in the direction of the arrow and is first supplied with high voltage from the high voltage power supply 30. It is charged to (+) by the If device 31.

Next, in the exposure section 29, the original is exposed to the slit, and at the same time, the static eliminator 32 to which high voltages A and C are supplied from the power supply 30 removes the AC voltage, and then the lamp 3
A static convex image is formed on the exposure drum surface by the process of 3)''(-).

In the developing device 34, the liquid is developed by the developer 35;
b After being removed, it was added to the Bost charger 36 (-)
Excess developer is removed without disturbing the image due to corona charging due to high voltage, 1 Meri 111! It will be done. The transfer paper P is fed from the paper feeding section by a roller 37 or the like, and is separated by a separation belt 39 and guided to a drying and fixing section 40.

The transfer paper P is heated and fixed in the fixing waste section 40 (7i') and removed. ji：
After removing the electric charge σi remaining on the surface in the vessel 47, the discharge o
- It is sent out onto the tray 49 from the discharge port at the rough I8.

The ejected transfer paper P is stacked with copy ii+i'& on top and the last page number of the original on the bottom eζ. In this way, all of the 1,000,000,000 people who have been recognized as talented are kohi.

- When finished, place the notebook manuscript and transfer paper on the first loading table 2.
The documents are stored in the order of the pages of the originals stacked in No. 3, which eliminates the loss of time required to change the order of the pages.

In the copying machine described above, a jam occurs near the roller 10 at the end of the exposure section and near the rollers 11 and 12 of the guide plate 14 that reverses the sheet! - If there is a delay in discharging the sheet to the tray 92, the jam will be amplified by subsequent sheets, and important documents may be damaged.

In this example, the light source 21 and the light receiving cable 22, which normally detect the leading edge of the sheet and temporarily stop the sheet, are used as the first detection means for jam detection to prevent the jam from expanding, and the trailing edge of the sheet that has started to be conveyed again is detected by this. This is detected and the first timer shown in FIG. 3 is activated.

And a light source 120 installed near the 141 exit. Light receiving element 1
It is determined whether or not the sheet has caused a delayed jam by the second protruding means 21. Furthermore, the sheet tip ψ1f is detected by the second detection means.
ii is detected, the first timer is canceled, the second timer is activated at the same time, and a jam remaining on the light receiving element 121 is detected based on whether or not the second S output means detects the trailing edge of the sheet. .

Also, sheet originals may have file holes or areas with significantly different light transmittances. For example, when a sheet with holes for files is fed from the large side, the detection signal when moving from the sheet section to the hole is used as the sheet trailing edge signal, and the signal from the hole to /
The light-receiving element 22 outputs a detection signal when moving to the -t portion as a sheet leading edge signal. The timer is activated by this erroneous signal, causing a malfunction in jam detection.

In this example, this erroneous signal is removed by an integrating circuit, and one word of only the actual leading edge or trailing edge of the sheet is used as an input signal.

An example of the jam 1 protrusion circuit described above will be described in detail with reference to FIG. 3. In the connection relationship, the free flow of this circuit is connected to the J-connector J2-10. PM via J2-1:
IJ4 11 elephants 4v, 13 to A obtained from the power supply in Kinai
Ground oV is connected to. Figure 2 light VIK 21
, the detection signal C from the light receiving cable 22 is input as +24V from another circuit (not shown) to this circuit via the connector Jl-2. Input connector J 1-2 r, r
+ - emitter of transistor Q1, resistor L, a, , diode I) connected to the cathode of I, base of transistor Q1 connected to collector of transistor Qt via resistor 4, base of transistor Q It is connected to the capacitor C8 via Zl)1 to form an integrating circuit for the input signal C. The collector of transistor Q1 is connected to resistor 16. through capacitor C4. The differential circuit is connected to the cathode of diode 8), fil, ? The anode of the diode D is connected to the collector of the transistor Q constituting the monostable multivibrator for the first timer and to the base of the transistor Q via the capacitor C7. The base of transistor Q is a resistor and is reverse biased, normally transistor Q3 is on, so transistor Q4 is off. The timer time is set by resistor I and capacitor zero. Diode 1〕4ha!・For protection of transistor Q4.

The collector of transistor Q4 is connected to the base of transistor Q of the inverter via resistor 2, and the collector of transistor Q is connected to resistor 5, R17+, diode D6, etc. via capacitor C6 of the differential circuit. It is connected to the collector of transistor Q. The resistor 81 is connected to the gate of the thyristor Q6 via the diode 1)7, and the anode of the thyristor Q6 is connected to the light emitting diode DIQ for jamming [θ].

To explain the operation, when the sheet is inserted now, the detection signal causes the capacitor CI to be charged via the resistor 1 (, 3, and the Zener diode (Zl) due to the charging? is conductive. Transistor Q then conducts, producing a 24V output to capacitor C4. However, since the 24V rising signal corresponding to the sorting tip is blocked by diode 1], the monostable multi is not activated. Therefore, while the sheet is temporarily stopped and the light receiving element 22 is detecting the sheet, the first timer does not start operating. When the drum 24 of the copying machine rotates to a predetermined position and the notebook begins to be conveyed again, the input signal changes to O when the trailing edge of the sheet passes the light receiving element 22. The momentary capacitor C4 and diode D therefore generate a negative trigger pulse. The monostable multi-channel transistor is activated by this pulse, and the collector potential of the transistor Qs and the base potential of the transistor Q are lowered, and the transistor Q4 is turned off. Therefore, since the collector potential increases, transistors Q and Q are turned on.

This on state continues until capacitor C1 is charged and i-transistor Q4 is turned on. Then transistor Q4
When turned on, transistor Q changes from on to off, and capacitor C8 generates a positive trigger pulse that activates thyristor Q. That is, after the time required for the leading edge to reach the second light receiving element 121 after the light receiving element 22 detects the trailing edge of the sheet, the jam detection signal is outputted.

Here, when a hole for a file is made in the sheet, the hole causes the light receiving element 22 to generate a pulse similar to that when the trailing edge of the sheet is detected.

However, the sheet t detection signal in the file hole near the sorting tip is the Zener diode ZL) 1 break ↑ 1 de position 1
Since it does not have enough width to charge the capacitor C, the transistors Q, , 'Q, cannot be activated. Therefore, the monostable multi is not driven by an erroneous signal caused by the hole.

Next, to explain the part that determines whether or not a delay jam has occurred, in the configuration, the light receiving element 121 is connected to +24V through a resistor 1 wire and an adjustment resistor The input terminal 3 of Q11 is connected to the input terminal 2 through the resistor 5, and the resistor 1 is connected to the ground through 3I.The operational intensifier Q11 receives the light from the light source 120.
21, a low level (approximately +2V) is output from terminal 6, and when the light is cut off, a high level (+24V) is output.
) is output. The output terminal 6 is connected to the base of the transistor Q7 via the resistor
via transistor Q1. connected to the base of The collector of the transistor Q7 is the differential capacitor Cs.
connected to.

That is, when /-t is detected by the light receiving element 121, the calculation increase rl
When the output voltage of the J transistor Ql+ is high, a high level is output from the first element 6, so the transistor Q7 is turned on. Therefore, normally 7-
1. When conveyed and reaching the light receiving element 121, the jam detection pulse from the monostable multi is grounded by the transistor Q1 and connected to the thyristor. .

is not activated, so there is no jam indication. However, if there is a delay during sheet movement or a paper jam occurs, the transistor Q7 remains off, so the thyristor Q6 is activated by the pulse from the monostable multi-function device, and the light emitting diode DIo lights up to indicate a jam.

Next, to explain the part of the safety circuit that operates together with this jam display, the anode of the light emitting diode JJIO is connected to the penis of the transistor Q via the Zener diode ZD and the resistor It, and the transistor ( The collector of 9 is connected to a transistor Q via a resistor R, .
Connected to the base of 0.

Furthermore, the collector of transistor Q is connected to transistor QI.
It can be connected to the emitter of O. SL is a plunger for rotating the rollers 6.7 and 8.9 of the sheet document feeding section, SL is a plunger for rotating the rollers 9 and 9' of the main body, and MS is a plunger for rotating the rollers 9 and 9' of the sheet document feeding section. The microswitch that turns on when the connector J1-1 is connected to the rollers 9, 9
′ is connected to a plunger (not shown) that stops the operation.

That is, when thyristor Q6 is inactive!・Runstar Q
Since s and Qo operate, plunger SL, .

SL can operate in response to a signal from connector JI3 that is synchronized with the paper feeding of the copier main body, and stack 7'+1
/l - Automatically feeds the original. However, when the thyristor (96) operates and generates a jam signal, the transistors Q, ,
Q is turned off and plunger SL is turned off.

The signal driving SL disappears. At the same time, the transistor Q1o is turned on, so that the stop plunger is activated to stop the timing rollers 6.7, 8.9 and interrupt automatic sheet feeding. Therefore, when a jam occurs, conveyance of subsequent sheets is stopped to prevent the jam from expanding.

Next, to explain what happens when a sheet jams on the light-receiving element 121, the collector of the transistor Q+8 has a resistor of 1 due to its structure. , diode store.

is connected to the anode of switch element Q+7 and to capacitor C+s via. Switch element Ql
? The gate of resistor tt+7. A program voltage divided by R4g is applied, and the cathode of the switching element Q+7 is connected to the gate of the thyristor Q6.

When the tip of the tip reaches the light-receiving element [2], the output of the operational amplifier Qll is transmitted to the transistor Q. is turned on and transistor Qw is turned off. And the capacitor Cps is a resistor R. The turbulence starts at a predetermined time constant via . When the charging potential reaches the level of +-ii; of the switch element QI□, the switch element 9 is turned on. Here, the adjustment resistance Vl(
, , is a charging time longer than the time required for the sheet to pass over the light receiving element 121. Therefore, after the leading edge of the sheet is detected, when the leading edge of the sheet passes normally through the light receiving element 12 and .psi.;14 is detected after the sheet, the output of the operational amplifier Ql+ decreases and the transistor Q11 turns on. Therefore, the electric field of the capacitor C1 is discharged through the diode D+t, and the switching element Ql? turns on the thyristor q. I don't turn it on. In other words, no jam signal is generated. However, regardless of whether the note has arrived at the light receiving element 121, if the note stops there, the thyristor Q6 is turned on by the switching element Q+1.
is triggered and the light emitting diode D,, indicates a jam,
Then, as described above, the drive of the rollers is stopped and automatic paper feeding is interrupted.

Note that the capacitor Cs is connected to the capacitor Cs through the diode D, η and η1, and the capacitor C9 is connected to the resistor output 5 and the capacitor C9. When the power supply of 24 V is turned on, the transistor Q is off, so the transiently generated positive pulse is absorbed by the capacitor C9. . Therefore, the thyristor Q6 will not operate due to a malfunction when the power is turned on. Further, the counter CNT counts the HI number of notes, and the above-mentioned integrating circuit prevents an erroneous R1 count. Contenza C,, CJ anti-R, r: J-24V 'PJ”i
This makes the sentence even smoother.

Another example of the present invention will be explained with reference to FIG.
In the figure, an inverter circuit using a transistor QIO is connected to the collector of the transistor Q1 in the integrating circuit, and when the input signal Ct is outputted, it becomes zero 'F1.
i (+24V when exposed to 7T).

With this configuration, the short width pulse input signal due to the hole in the sheet is absorbed by the capacitor C8] ・Ransistor Q
There is no output from 1, therefore, as long as there is a sheet connecting the hole), transistor Q remains off, so transistor Q
The collector potential of to is up to 24V'-1.

When the trailing edge of the sheet is detected, the transistor Qto
The collector potential of D decreases from 24V to 0, and diode D outputs a negative pulse to activate the monostable multi. At this time, the charging time of the capacitor Cj is set to be equal to or less than the interval between sheets in continuous autofeed.

; = size - par - As described above, the present invention uses one 7-If outputter to detect the 661 jam in the previous section and the second jam detection in the section after that point. tc and changes the time limit of the timer means for paulownia A2 jam detection according to No. 11g, which is related to the size of the sheet, so even if the sheet is small enough to complete passing through the sheet detection means early, the passage is completed. It is possible to detect a jam at a timing appropriate for the second jam detection, and to improve the four degrees of blueness of the second jam detection.

[Brief explanation of the drawing]

／′／'／加'! 11] is an example of a block diagram of a paper jam detection device according to the present invention, FIG. 2 is a sectional view of a copying machine with an auto feeder using the present invention, FIG. 3 is an example of a jam producing circuit according to the present invention, and FIG. 4 1 is another example of the jam production circuit according to the present invention. In FIG. 1, Sl: first detection means for producing the trailing edge of the sheet; Ill; first timer means;
<1 Discrimination means. Applicant Canon Co., Ltd. Procedural amendment (method) 1981 7 prefectures 2511 Commissioner of the Patent Office Mr. Manabu Shiga 1 Case indication + I ('i right 159 Patent application No. J3097 No. 2
Name of the invention Jam detection device 3 Relationship with the person making the amendment'l\e1 Patent applicant 4 agent Location 1 3-30 Shimomaruko, 146 Tokyo Metropolitan University +1 Ward
25. Date of amendment order: June 26, 1980 (shipment date EJ) 6. Drawing subject to amendment 7. Contents of amendment: engraving of the drawing (no change in content)

Claims (1)

[Claims] a sheet detection means provided on the sheet movement path; a first timer means for performing a timed operation for a first time required for the sheet to reach the sheet detection means after the sheet has been fed; a size signal generating means for generating a signal for detecting the sheet after the sheet reaches the sheet detecting means; and a size signal generating means for generating a signal for detecting the sheet after the sheet reaches the sheet detecting means; A jam detection means generates a jam signal if the sheet does not pass the detection means even after the second time period of the timer means has elapsed;