JPH04197942A - Jam control circuit for copying device - Google Patents

Abstract

PURPOSE:To prevent the degradation of jammed paper removing performance at the time of applying hand-operated paper feeding by providing a jam control timing switching means for performing the jam control of transfer paper on a transfer paper carrier path on the basis of the clocked value obtained by clocking the time from the driving starting time of a separating roller to the time of the transfer paper passing through first detecting means at the time of applying hand-operated paper feeding. CONSTITUTION:When hand-operated paper feeding is applied, the time from the driving starting time of a separating roller 5 to the time of transfer paper 2 passing through first detecting means 30-33 is clocked by the first detecting means 30-33. The conveying direction length of the transfer paper is judged by this clocked value, and the optimum jam control corresponding to each size length is performed by a jam control timing switching means 35.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a jam control circuit for a copying machine.

2. Description of the Related Art Conventionally, there is a method for controlling a jam on a transfer paper conveyance path of a copying device, as disclosed in Japanese Patent Publication No. 33270/1983, for example. In this case, the transfer paper detection means on the transport path counts the number of pulses until the leading and trailing edges of the transfer paper pass, and sets a timer for detecting the leading edge and a timer for detecting the trailing edge of the transfer paper, respectively. When the time-up of the numerical data, which can be changed according to the size of the transferred paper, is detected, the transfer paper detection state of the transfer paper detection means is checked, and a jam is determined based on this.

Problems to be Solved by the Invention Among the above-mentioned copying apparatuses, some are equipped with a manual paper feed section that allows transfer paper to be fed manually. Due to its functionality, such a manual paper feeder often makes copies of multiple sizes, so when performing jam control that requires transfer size information as in the past, the size of the manual paper feeder The detection mechanism becomes complicated and the cost becomes very high. Also.

Some copiers do not have a size detection mechanism like the one mentioned above, but use a control timing that can handle all sizes.
Some implement A and M control.

However, with this jam control method, it is not possible to optimally detect jams for each size, so depending on the size of the transfer paper, buckling on the conveyance roller or wrapping around the fixing roller can significantly impede the workability of removing jammed paper. This may cause deterioration or damage to mechanical parts.

Means for Solving the Problems Therefore, in order to solve such problems, the present invention provides a method for transferring transfer paper inserted from a manual paper feed tray to a transfer paper conveyance path through a paper feed roller and a separation roller in sequence. In a copying apparatus having a manual paper feed unit that guides the paper upward, and an automatic paper feed cassette unit that automatically feeds the transfer paper in the paper feed cassette onto the transfer paper conveyance path through a paper feed roller and a separation roller sequentially. , a first detection means for detecting the transfer paper placed on the transfer paper conveyance path immediately after the separation roller of the manual paper feed section, and the transfer paper carried out from the automatic paper feed cassette section; A second detection means for detecting the transfer paper is provided, and when manual paper feeding is used, the time from when the separation roller is driven until the transfer paper passes the first detection means is provided, and based on this measurement value, the transfer paper is detected. A jam control timing control means for controlling a jam on the transfer paper conveyance path is provided.

Operation When using manual paper feeding, the first detection means measures the time from when the separation roller is driven until the transfer paper passes the first detection means, and the length of the transfer paper in the conveying direction is determined based on the measured value, and each It becomes possible to carry out optimal jam control commensurate with the size and length.

Example An embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the overall configuration of a copying machine equipped with a jam control circuit. A manual paper feed section 2 is provided at the bottom of the main body 1. In this manual paper feed section 2, a manual paper feed table 3 is provided on the lower side surface of the main body 1. A paper feed roller 4 is disposed at one end of the manual paper feed tray 3, and a pair of separation rollers 5 are disposed adjacent to the paper feed roller 4. Furthermore, a pair of pinch rollers 6 are disposed adjacent to the separation roller 5.

Further, an automatic paper feed cassette section 7 is provided below the manual paper feed section 2 . In this automatic paper feeding cassette section 7, a paper feeding cassette 8 is provided on the bottom surface of the main body l. A paper feed roller 9 is disposed above the paper feed cassette 8, and a pair of separation rollers O are disposed adjacent to the paper feed roller 9. Furthermore, a pair of pinch rollers 11 are arranged close to the separation roller 10. The path of the manual paper feed section 2 and the path of the automatic paper feed cassette section 7 are both connected to a transfer paper conveyance path 13 in which a pinch roller 12 is disposed.

Next, the structure of the copying main body section disposed above the manual paper feeding section 2 and the automatic paper feeding cassette section 7 will be described. A document 1 placed on a document table 3 provided at the top of the main body 1
4 is operated and exposed by an exposure device 15 located directly below it. The exposure device 15 includes an exposure lamp 16, a condensing reflector 17, a plurality of mirrors 18, and an imaging lens 19. Then, such an exposure apparatus 1
The original image exposed by 5 is formed on the surface of photoreceptor 19 . A charge is applied to the photoreceptor 19 by a charger 20, and an electrostatic latent image is formed by exposure. This electrostatic latent image is visualized by the developing device 21.

On the other hand, the transfer paper 22 is fed by the registration roller 12 in synchronization with the toner image on the photoreceptor 19, and the toner image is transferred onto the transfer paper 22 by the transfer charger 23. The transfer paper 22 is transferred to the photoreceptor 1 by a separation charger 24.
Separated from 9.

Next, residual toner is collected from the photoreceptor 19 by a cleaning device 25, and the photoreceptor 19 is prepared for the next image forming cycle. The cleaning device 25 includes a cleaning brush 25a.
and a cleaning blade 25b.

Thereafter, the transfer paper 22 separated from the photoreceptor 19 is conveyed to a fixing roller 27 by a conveyance belt 26. As a result, the toner image on the transfer paper 22 is heated and fixed by the fixing roller 27, and then is discharged to the copy discharge tray 29 via the discharge roller 28, thereby completing copying.

Further, the above-mentioned copying apparatus is equipped with a jam control circuit as described below.

separation roller 5, registration roller 12, fixing roller 27,
Transfer paper detecting elements 30, 31, and 32, which serve as first detection means for detecting the transfer paper 22 immediately after passing the separation roller 5 of the manual paper feed section 2, are arranged close to the discharge roller 28, respectively.
33 are arranged respectively. In addition, the separation roller 10
A transfer paper detection element 34 serving as a second detection means for detecting the transfer paper 22 carried out from the automatic paper feed cassette section 7 is disposed close to the transfer paper detection element 34 . These transfer paper detection elements 30, 31, 32, 33, and 34 are composed of transmission type optical sensors. Furthermore, when using manual paper feeding, the time from when the separation roller 5 is driven until the transfer paper 22 passes the first detection means is measured, and based on this measurement value, the transfer paper 22 is
A jam control timing control means (detailed explanation thereof will be given later) is provided to perform "jam control" on the transfer paper conveyance path 13.

Next, the configuration of a control block inside the copying machine equipped with the above-mentioned jam control circuit will be explained.

The main control board 35 that controls the entire copying apparatus includes a CPU 36 that controls the entire main control board 35, a RAM 37 that temporarily stores information necessary for control, and an input interface 38 and an output connected to an external unit. An interface 39, a ROM 40 in which a control program for the copying machine is stored, and a program timer 41 for counting time necessary for paper feed control, jam (JAM) control, etc.
and a bus 42 that connects each of these elements. Further, the transfer paper detection elements 30, 31, 32, 33, and 34 are connected to the main control board 35.

In such a configuration, first, the transfer paper detection element 30,
The basic operations of 31, 32, 33, and 34 will be explained based on FIG. Guide plate 12a on transfer paper conveyance path 12
A hole 12b is formed in the hole 12b. In this hole 12b,
The projections a of the transfer paper detection elements 30.degree. 31.32, 33.34 project from the holes 12b. in this case,
When the transfer paper 22 is not being conveyed, the protrusion a is at the position shown by the solid line, and the transfer paper detection elements 30, 31, 32 .
The outputs of 33 and 34 become HIGH when not detected. Also,
When the transfer paper 22 is conveyed, the protrusion a moves to the position shown by the broken line, and the transfer paper detection elements 30, 31, 32, . ．． 33
．． The output of 34 becomes LOW when the transfer paper is detected.

Next, the operation of the "jam control timing control means" in the jam control circuit, which is the main part of this embodiment, will be sequentially explained. Here, "paper feeding control" and "jam control" when using manual paper feeding will be explained based on the timing chart of FIG. 4.

First, we will discuss "paper feed control." Waveform A is the control timing of a paper feed clutch (not shown) for driving the paper feed roller 4 and separation roller 5. Waveform B is.

This is a timing waveform of the transfer paper detection element 30 (hereinafter referred to as paper feed sensor 30). In this case, the paper feed clutch is first turned on (ON) at a pre-programmed timing.
), and when the transfer paper 22 reaches the paper feed sensor 30, the paper feed clutch is temporarily turned off (OFF>, and then turned on again after an arbitrary period of time, and as soon as the transfer paper 22 passes the paper feed sensor 30, the paper feed clutch is turned off. The passing time Tsize from turning on the paper feed clutch to turning off the paper feed sensor 30 is measured.

Waveform C is the control timing of a registration clutch (not shown) for driving the registration roller 12.

The waveform is a timing waveform of the transfer paper detection element 31 (hereinafter referred to as registration sensor 31). In this case, the registration clutch is turned on after the transfer paper 22 reaches the registration sensor 31 and the synchronization control time Tc with the image has elapsed, and is turned off after the transfer paper 22 passes the registration sensor 31. After passing through the registration rollers 12, the transfer paper 22 passes through a transfer charger 23, a separation charger 24, and then a fixing roller 27.
transported to. The waveform E is generated by the transfer paper detection element 32 (hereinafter referred to as
This is a timing waveform of the fixing sensor 32).

Thereafter, the transfer paper 22 reaches the ejection roller 28 and is ejected onto the ejection tray 29. Waveform F is the transfer paper detection element 3
3 (hereinafter referred to as sheet discharge sensor 33).

Next, "jam control" will be described. First, as a jam check in the paper feed section, the paper feed sensor 30 is checked at the timing waveform of the paper feed clutch re-on (ON), and if the transfer paper 22 has not arrived at this point, the jam is cleared. Next, as a jam check in the registration section, the registration sensor 31 is checked at timing Jd, which is a time Tjd after the paper feed clutch re-on (ON) timing, and if the transfer paper 22 has not arrived at this point, the jam is cleared. be done. To clear the jam in the fixing section, T je from the time of resist clutch on (ON), later timing Je,
The fixing sensor 32 is checked, and if the transfer paper has not arrived, the jam is processed. Also, from this Je, T j
At e and later at Je, the fixing sensor 32 is checked again.
If the transfer paper 22 does not pass the fixing sensor 32, the jam will be processed. Similarly, as a jam check for the paper ejecting section, Tjf is determined from when the fixing sensor 32 is turned on, and Jf is determined after a period of time has elapsed.

The paper discharge sensor 33 is checked, and at this point the transfer paper 2
If 2 has not been reached, the jam will be processed.

Further, the paper ejection sensor 33 is checked again at Jf after a time T je from this Jf, and if the transfer paper 22 has not passed the paper ejection sensor 33, the jam is processed.

T je is determined based on Tsize, and the optimum value is determined based on the length of the transfer paper in the conveying direction.

Next, the timing waveforms of waveforms b-f in FIG. 4 are the control timings in the case of the transfer paper 22 whose length in the transport direction is longer than the transfer paper 22 controlled at the timing of the waveforms B to F described above. In this case as well, control can be performed in the same manner as in the case of waveforms B to F described above.

Based on this measured value, the fixing sensor 32 and the ejection sensor 33
The timing for checking the jam when the transfer paper 220 passes is T.
ajB. Other controls can be performed in the same manner as described above.

Next, the above-mentioned "paper feed control" and "jam control" will be explained in more detail based on the flowcharts of FIGS. 5(a) to (f).

First, FIG. 5(a) shows the main control flow of this embodiment. When a power switch (not shown) is turned on, the CPU 36 of the main control board 35 is activated, and control of the copying apparatus is started according to the control program stored in the ROM 40.

When the program starts, first, subflow standby control for controlling initial setting control and standby control of the copying apparatus is executed. Next, it is checked whether a print start SW (not shown) has been turned on, and if the determination result is NO, the process returns to immediately before standby control, and the control continues in this loop until the print start SW is turned on. . If the determination result is YES, the next subflow copy control is executed.

This subflow executes copy process control and executes each process necessary to create a copy. lastly,
It is checked whether the number of copies input by a key not shown has been completed. If the copying is not completed, the process returns to the point immediately before the subflow copy control, and is controlled in this loop until the copying is completed. When the copying is completed, the process returns to the point immediately before the subflow standby control and prepares for the start of the next copying.

Next, the subflow copy control is further composed of three subflows, as shown in FIG. 5(b).

As shown in FIG. 5(C), the subflow "Paper feed control" includes control of the paper feed clutch and registration clutch, and control of the transfer paper 22.
Measure the transit time of Further, the subflow "process control" executes image forming process control. moreover,
As shown in FIG. 5(d), the subflow "jam control" executes jam checking of the transfer paper 22 in the conveyance path.

In the subflow "paper feed control" in FIG. 5(c), first paper feed control controls the first drive of the paper feed clutch, second drive of the paper feed clutch, and
The control system is composed of a second paper feeding control that measures the passage time of the transfer paper 22, and a registration control that controls the drive of a registration clutch. In addition, in the sub-flow "jam control" in FIG. The third part controls the jam of
It consists of jam control.

Next, the above-mentioned "second paper feed control" and "second jam control J
This will be explained using an example. First, the second paper feed control is shown in Figure 5 (
This will be explained based on the flowchart of e). First, the first
It is determined whether the paper feed control has ended, and if it has not ended, the process returns to the subflow "Paper feed control", and if it has ended, it is then determined whether the paper feed clutch is on. If it is already on, skip to immediately after the measurement counter starts. If the paper feed clutch is not on, then it is determined whether it is the second paper feed clutch on time. If the judgment result is NO, the process returns to the paper feed control, and if the judgment result is YES, the process moves to the next step, turns on the paper feed clutch, and then executes a subflow for measuring the transmission time of the transfer paper 22. Execute "Measurement counter A start",
This starts measuring the passing time. Next, it is checked whether the paper feed sensor is on, and if it is on, the process returns to the subflow "paper feed control".

If it is not on, turn off the paper feed clutch, and then execute the subflow "Measurement counter stop" to stop measuring the passing time. Next, (COUNTA), which is the measured value of the passing time by the measurement counter A, is set in the data register DSIZE, and finally, after setting the second paper feeding end flag, the process returns to the subflow "Paper feeding control". By executing such a flow, it is possible to measure the time from when the paper feed clutch is turned on (separation roller drive) until the transfer paper 22 passes the paper feed sensor 30.

Next, the second jam control will be explained based on the flowchart of FIG. 5(f). First, it is determined whether or not jam timer B has started, and if it has already started,
Subflow [Skip to immediately after jam timer B start J. If not, then it is determined whether jam timer A has started. Jam timer A is a control timer for performing jam check Je in FIG. 4, and is a control timer for performing jam check Je in FIG.
It is started within. Then, if the judgment result of jam timer A is NO, the process returns to the subflow "jam control",
If the judgment result is YES, the contents of jam timer A (
JTiMERA) is equal to or greater than Tje. If the judgment result is NO, the process returns to the subflow "jam control", and if the judgment result is YES, it is checked whether or not the fixing sensor 32 is on, and if it is not on, it is determined that there is a jam, and the subflow The "jam processing" is executed, and then the subflow "jam control" is returned to. If it is on, the subflow ``Jam Timer B Start'' is executed to start the control timer B for performing the jam check Je shown in FIG. 4. Next, the contents of the data register Dsize are compared with size comparison data 5size for classifying the size of the transfer paper 22 into long and short.

Depending on the result of the comparison, the flow branches into a long size flow and a short size flow. In the case of short size, the contents of jam timer B (JTTMERB) and data Tje□
If JTIMERB is smaller than T je, return to subflow "jam control" and return to T je.
, the process moves to the next step of detection by the fixing sensor 32. In addition, in the case of long size, the contents of jam timer B (J T IMERB) and data Taje,
If JTIMERB is smaller than Taje, return to the subflow "jam control" and return to Taje.
In the above case, the process moves to the next step of detection by the fixing sensor 32. Next, the detection state of the fixing sensor 32 is checked, and if the fixing sensor 32 is on, it is determined that there is a jam, and the subflow "jam processing j" is executed.If the fixing sensor 32 is not on, the second jam control Set the end flag and return to the subflow "jam control".

By executing the flow described above, it is possible to reliably perform jam control when using manual paper feeding. That is, by using the jam control timing control means, when using manual paper feeding, various sensors installed on the conveyance path immediately after the separation roller 5 cause the transfer paper 22 to pass through various sensors from the time the separation roller 5 is driven. It is possible to measure the time it takes to feed the transfer paper, use this measurement value to determine the transfer paper transport path, and perform optimal jam control according to each size and length of the transfer paper 22. This allows for manual paper feeding with a simple configuration. It is possible to prevent deterioration of jammed paper removal performance and damage to the device during use.

Effects of the Invention The present invention provides a manual paper feed unit that guides transfer paper inserted from a manual paper feed tray onto a transfer paper conveyance path through a paper feed roller and a separation roller in sequence, and a transfer paper in a paper feed cassette. and an automatic paper feed cassette section that automatically feeds paper onto the transfer paper conveyance path via a paper feed roller and a separation roller sequentially, wherein the transfer paper conveyance immediately after the separation roller of the manual paper feed section is provided. A first detection means for detecting the transfer paper placed on the path is provided, a second detection means for detecting the transfer paper carried out from the automatic paper feed cassette section is provided, and the A jam control timing cutter that measures the time from when the separation roller is driven until the transfer paper passes the first detection means, and controls the jam of the transfer paper on the transfer paper conveyance path based on this measured value. Since the control means is provided, the jam control timing control means can be used to determine the time from when the separation roller is driven to when the transfer paper passes the first detection means using the first detection means when using manual paper feeding. This makes it possible to determine the length of the transfer paper in the conveying direction based on the measured value, and to perform optimal jam control according to the length of each size.This makes it possible to prevent jams when using manual paper feeding with a simple configuration. This can prevent deterioration of paper removability.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing the overall configuration of a copying device that is an embodiment of the present invention, FIG. 2 is a block diagram showing the internal control system of the device, and FIG. 3 is the operating principle of the transfer paper detection element. FIG. 4 is a timing chart showing the control timing when performing paper feed control and jam control when using the manual paper feed unit, and FIG. 5 is an operational control for paper feed control and jam control. It is a flowchart explaining the contents in more detail. 2...Manual paper feed section, 3...Manual paper feed tray, 4...Paper feed roller, 5...Separation roller, 8...Paper feed cassette, 9...Paper feed roller , 1o...separation roller, 13.
...Transfer paper conveyance path, 22...Transfer paper, 30, 31,
32.33...First detection means, 34...Second detection means 35 Figure (wait) (a) (b), %5 Figure (work Z) (C) (d) (e)

Claims (1)

[Claims] A manual paper feed unit that guides the transfer paper inserted from the manual paper feed tray onto the transfer paper conveyance path via a paper feed roller and a separation roller in sequence, and a paper feed roller and a separation roller that transports the transfer paper in the paper feed cassette. and an automatic paper feed cassette section that automatically feeds paper onto the transfer paper conveyance path through sequentially, the automatic paper feed cassette section is placed on the transfer paper conveyance path immediately after the separation roller of the manual paper feed section. A first detection means for detecting the transfer paper is provided, a second detection means for detecting the transfer paper carried out from the automatic paper feeding cassette section is provided, and the transfer paper is detected from the time when the separation roller is driven when manual paper feeding is used. A jam control timing control means is provided which measures the time until the paper passes the first detection means and controls the jam of the transfer paper on the transfer paper conveyance path based on the measured value. Features a jam control circuit for copying machines.