JPS58104853A - Copying machine - Google Patents

Abstract

PURPOSE:To detect the trouble of a paper feed mechanism by providing a plurality of jam sensors along a paper feed passage and counting and recording the number of times of jam detection of each sensor. CONSTITUTION:Jam sensors S1-S3 are provided between a paper feed roller 3 over a paper feed cassette 2 and resist rollers 4, between a separation roller 5 downstream to a photosensitive drum 1 and a fixation unit 6 and downstream to the fixation unit, respectively. The detection output signals of the sensors S1-S3 are applied to a microcomputer 7. The number of times of jam detection by each sensor is counted and indicated on a light emission diode display 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that performs recording and transfer by sequentially feeding sheets of paper, and in particular, a copying machine capable of self-judging the continuity of jamming of fed sheets. This is what I did.

Regarding so-called jams of transfer paper that occur in conventional copying machines, it generally only indicates that a jam has occurred, or does not indicate the location where the jam has occurred. The judgment as to whether this is an accident or due to a malfunction in the paper feeding mechanism must be determined based on the memory of the maintenance personnel. The problem was that the question of whether or not a jam occurred was ignored.

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional art, and when a jam occurs many times in the same part of the paper feed path, it is possible to self-determine that there is an abnormality in that part, thereby facilitating maintenance. The object of the present invention is to provide a copying machine that can be improved in design and manufacturing.

The present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows a schematic structure of a transfer sheet feeding mechanism in a copying machine of the present invention, and FIG. 2 shows an example of the structure of a control circuit.

In the illustrated configuration, l is a photosensitive drum, ko is a paper feed cassette, J is a paper feed roller, da is a registration roller, 3 is a separation roller, 6 is a fixing device, and S/~s3 are jam detection sensors. , the respective detection output signals are supplied to the microcomputer 7. Further, I is a light emitting diode display that displays the number of copies and the occurrence of a jam, D is a drive circuit for the display I, and 10 is a copy sequence control circuit that controls motor drive, path lighting, charging, temperature adjustment, etc. /l is a non-volatile memory device.

In the copying machine of the present invention having such a configuration, after turning on the power switch,
Until you press the copy button, it works just like a normal copier.
Created IIb and entered operating status 1iK. Then, when the copy button is pressed, the operation follows the flowcharts shown in FIGS. 3 and 3. That is, first, step J.7
The drive motor starts rotating, and the photosensitive drum/,
The fixing device 6, a developing device (not shown), a cleaner, etc. are started.

Next, in step J-1, printing and printing are performed, and the transfer paper is fed to the main body of the copying machine by the paper feed roller 3. Next, in step 3.3, when a jam occurs in the transfer paper feeding path, a jam detection output signal is first generated from the jam sensor S/. On the other hand, in step 3-da, it is determined whether or not a jam has occurred based on the presence or absence of the jam detection output signal, and if a jam has occurred, the process moves to the 70-chart shown in dl and q. If no jam has occurred, the process moves to the next step 3.jK.

In steps 3 and 5, the paper is guided to the photosensitive drum 7 by the registration roller ladder, the lfi++ on the drum is transferred, and the paper is separated from the drum by the separation roller j. Then, in steps 3 and 6, the separation row 2
When a jam occurs at position 3, the jam sensor S generates a jam detection signal.
, it is determined whether or not a jam has occurred based on the presence or absence of the jam detection signal, and if a jam has occurred, the process moves to the flowchart shown in Mda, and if no jam has occurred, The process moves to step J-1. In step J/IK, the ms transferred to the paper is transferred to the fixing device 6.
After it is fixed, it is fed to the paper ejection section. Next, in step J.D, when a jam occurs in the position facing the paper discharge section, the jam sensor 8J generates a jam detection signal, and after processing according to the flowchart shown in the figure, step K and step J. 10 or J-//fC transition. Then, in step J-10fC, if no jam has occurred and continuous copying is performed, return to step J-2 and repeat the above process, or step 3. At //, the copying sequence is stopped both when no jam has occurred and the copying is terminated as is, and when a jam has occurred.

Next, in the flowchart shown in the figure, the variable C
0UNT and the variable J (iz
) and a constant Y are set and stored in the memory // in the configuration shown in the first diagram. This memory// uses a non-volatile memory such as a magnetic disk, magnetic tape, magnetic bubble, or other writable/continuous memory element so that the memory does not disappear even when the power is turned off. Also, the variable C0
UNT is the total number of times of the above-mentioned copying sequence, variable J (n) is the total number of times jams have been detected at each location by each jam sensor S/, 8 pieces, and S3;
X and Y, which will be described later, are constants related to v4, and the number of times J of jam detection is required until the number of copies C0UNT reaches the number Y.
When (n) reaches a constant IK, it is determined that there is a fixed abnormality in paper feeding at each location.

That is, first, at step /, the variable C0UNT is increased by 7 regardless of whether or not a jam occurs. Next, in step C, it is determined whether or not a jam has occurred, that is, whether any of the jam sensors 8/, S, and S3 is generating a jam detection signal, and it is determined whether any of the jam sensors has occurred. If neither has occurred, the process moves to step-tei 6', and if none has occurred, the process moves to step-tei-3. Next, in step J, for example, if the jam sensor S/ generates a jam detection signal, the variable J is
(If the jam sensor S- is generating a jam detection signal, the variable J(!) is increased by 7.
Increase the amount. Next, at Step-tei San, set variable J.
When (m) reaches the constant XK, the process moves to Step 3; if it has not reached the constant X, the process moves to Step 6. For example, if the jam sensor 8/ detects a jam, the light emitting diode display board KrE/J in the configuration shown in the first diagram is displayed in the step tray j, and then the memory is displayed in the step tray j. All the values of the variables C0UNT and J(su~J(1)) stored in 2 are returned to O. Also, in step 6, it is determined whether the value of the variable C0UNT has reached the constant Y. , when the constant Y has been reached, move to step tei-ri and return the variables COUNT and J(su~J (1) to 0), and when the constant YK has not been reached, immediately return to the first step. Step 3 in the flowchart shown in the figure: Move to 'nib J-//, and turn off the control of the copying sequence by the sequence control circuit IO in the configuration shown in the first figure. Note that if there is a ''C jam in the step-tei... If it has not occurred, perform the same processing as in steps 6 and 7 described above at steps 6' and 7, and then proceed to step 3 IO in the flowchart shown in Figure 3. Then, it is determined whether or not to perform continuous copying. If continuous copying is to be performed, the process returns to step 3-- and the subsequent steps are repeated. If continuous copying is not to be performed, step 3-l/- is performed.
Then, control of the copy sequence by the sequence control circuit IO is turned off.

Next, as another configuration example of the copying machine of the present invention, in the configuration shown in the first figure, in addition to the above embodiment, each jam detection signal from each jam sensor S/ to S3 is displayed on an individually prepared display. is guided through the microcomputer and display control circuit,
Display it all the time, or display only the necessary passes. Alternatively, the number of jams for each i may be displayed on the display 1, so that it is possible to directly judge whether the paper feeding state at each location is good or bad based on the number of times jams are detected by each jam sensor S/ to S3. This also makes maintenance of the copying machine easier.

As is clear from the above description, according to the present invention, the operating state of the copying machine can be determined at a glance by numerically displaying the state of jam occurrence in each part of the transfer paper feeding path of the copying machine. This has the advantage of being extremely convenient for both the user and the manufacturer.

[Brief explanation of the drawing]

Figure 1 is a block diagram schematically showing an example of the general configuration of the copying machine of the present invention, Figure 1 is a block diagram showing an example of the configuration of its control circuit, and Figures 11 and 7 show the control process. This is a four-chart shown in sequence. l...Photosensitive drum, -...Paper cassette,
J...supply an-ra, reference...registration roller,! ... Separation roller, 6 ... Fixing device, F ... Microcomputer, 1 ... Light emitting diode display, D ... Drive circuit, IO ... Sequence control circuit, /l ... Memory, S /~8J...Jam sensor. Patent applicant Canon Co., Ltd. Figure 3

Claims (1)

[Scope of Claims] 1) Paper is fed sequentially.-IiiiigIII:1'
) In a duplex machine that performs transfer, the number of jams detected by each jam sensor is counted and recorded. This copying machine is characterized by being able to self-determine the continuity of jam occurrence at the location where the jam sensor is installed. 2. Scope of Claim Is Section 1 In the copying machine, the number of jam detections by each jam sensor and the series of jam occurrences! A copying machine characterized by displaying the result of self-judgment regarding the nature of the copy.