JPH08272165A - Copying device - Google Patents

Abstract

PURPOSE: To prevent jam resulting from feeding of different size sheet of paper by judging whether or not the sheet size is identical to the preset size, and if not, discharging to outside the device upon conducting a single-side copying. CONSTITUTION: The body 32 of a copying device concerned includes a CPU 31 which controls the whole device. An operation panel 30 is equipped with a display part 33, two-side copy mode key 34, multi-copy mode key 35, inverted sheet discharge mode key 36, ten key 37, density control key 38, copy key 39, and stop key 40. In the case either of the two-side copying function, multi- copying function, and inverted sheet discharge function is selected, the CPU 31 judges whether or not the sheet size sensed by a sensing means is identical to the predetermined sheet size. If not, no function is executed, and the sheet undergoes only single side copying and is discharged to outside the copying device 32, and the CPU 31 notifies the fact by the display part 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine having at least one of a double-sided copying function, a multiplex copying function, and a reverse sheet discharging function.

[0002]

2. Description of the Related Art A two-sided copy function, a multiple copy function,
In a copying machine having at least one of the reverse paper ejection functions, if a paper of a size different from the input and set paper size is manually fed or is fed from an adjustable cassette to perform a copying operation, If the paper is not detected within the specified time by the multiple paper detection sensors provided in the paper transport path, or if it is detected that the paper is still passing after the specified time has elapsed, it is determined that a jam has occurred and the paper is placed in the device. The jam was displayed while it was staying.

Next, the control procedure in the multiple copy mode will be described in more detail with reference to the flowchart shown in FIG. When the multi-copy mode is set in step S511, the copy paper size is set in step S512, and then copying is started in step S513, the paper is conveyed from the paper feed tray or the multi-feeder in step S514. To start. In step S515, it is determined whether or not the sheet is detected by the registration sensor within the specified time. If an affirmative decision is made, a copy operation in the setting mode is performed in step S516,
In step S517, it is determined whether or not the paper sensor at the entrance of the intermediate tray detects the paper within the specified time.
If the affirmative determination is made, the normal operation is performed, and thus the process proceeds to step S518. In step S518, it is determined whether or not the set number has been completed. When a negative determination is made, the process returns to step S516, and when an affirmative determination is made, the process ends. On the other hand, as a result of the determination in step S515, if the sheet is not detected by the registration sensor, the copy operation is stopped in step S520, and step S5 is performed.
A jam is displayed at 21. Then, step S522
To cancel the error. If it is determined in step S517 that the paper sensor at the entrance of the intermediate tray does not detect the paper within the specified time, the process proceeds to step S520.

[0004]

When the set paper size is, for example, A3, the paper sensor at the entrance of the intermediate tray must detect the paper within the specified time (step S5).
17) Change the paper path by rotating the flapper of the intermediate tray. However, when the size of the conveyed sheet is A4 instead of A3 which is the same size as the set sheet size, the leading edge of the sheet of A4 does not reach the sheet feeding roller at the exit of the intermediate tray. The paper feed roller prevents the paper from being fed, and a jam occurs.

Further, in the case of reversing paper ejection, and conversely, the set paper size is A4, but when the size of the paper actually conveyed is A3, this A3 paper is placed in the reversing path. Since the paper is fed too much, and the trailing edge of the paper comes off from the transport roller in the reversing path, a jam occurs.

Further, in the duplex copy mode, similarly, the set paper size is A4, but when the size of the paper actually conveyed from the multi-feeder is A3, the set paper size is smaller than the set paper size. Since the size of the conveyed sheet is long, a jam may occur in the movable guide in the reversing path. Even if this A3 size paper passes through the reverse path and is sent to the intermediate tray, the set paper size is A4, so the flapper of the intermediate tray does not operate, and this A3 size The trailing edge of the paper remains in the conveyance path of the intermediate tray. Therefore, the leading edge of the next sheet of paper is not well fed, and a jam occurs.

When a jam occurs, the operator is forced to search the inside of the copying machine to completely remove the paper. In this case, the operator may make a mistake in operation, and further, it takes a long time to recover the jam. Was needed. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a copying apparatus capable of preventing a jam caused by carrying a paper having a size different from the set paper size. It is in.

[0009]

According to the present invention, in a copying machine having at least one function of a double-sided copying function, a multiplex copying function, and a reverse sheet discharging function, the size of a sheet is detected during conveyance. Detecting means and the double-sided copying function,
A determination means for determining whether or not the paper size detected by the detection means is the same as a preset paper size when either the multiple copy function or the reverse paper discharge function is selected, and the determination means. If the determination is negative, the control means for performing one-sided copying on the sheet without executing any of the selected functions, and discharging the sheet out of the apparatus; And a notifying means for notifying.

[0010]

According to the present invention, when any one of the double-sided copying function, the multiplex copying function and the reverse sheet discharging function is selected, whether the paper size detected by the detecting means is not the same as the preset paper size or not. If the determination means makes a negative determination, the control means does not execute any one of the selected functions, and the control means performs one-sided copying on the sheet and discharges it out of the apparatus, and notifies the effect to that effect. To announce.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 32 is a copying apparatus main body. Reference numeral 31 is a CPU, which controls the entire apparatus. An operation panel 30 includes a display unit 33, a double-sided copy mode key 34,
Multiplex copy mode key 35 and reverse paper ejection mode key 36
A numeric keypad 37, a density control key 38, a copy key 39, and a STOP key 40 are arranged.

FIG. 2 shows the structure of the copying apparatus main body shown in FIG. In FIG. 2, reference numeral 1 denotes a document illumination lamp for illuminating a document. Reference numerals 2 to 6 are mirrors for guiding the reflected light from the document to the photosensitive drum 7.
Reference numeral 5 denotes a zoom lens, which is arranged between the mirrors 4 and 6 such that the optical path between the mirrors 4 and 6 coincides with the optical axis. Reference numeral 8 denotes a multi-feeder for manually feeding various copy sheets. Reference numeral 9 is a registration roller for controlling the paper feed timing.

Reference numeral 25 is a pre-exposure lamp, which is used for the photosensitive drum 7.
Is to remove the electricity. Reference numeral 13 denotes a primary charger, which charges the photosensitive drum 7 to a predetermined potential. 10
Is a developing unit for developing the latent image on the photosensitive drum 7 with toner. Reference numeral 11 denotes a toner popper, which supplies toner. Reference numeral 15 is a transfer / separation charger. Reference numeral 12 is a cleaner for scraping off and cleaning the untransferred toner on the photosensitive drum 7. A paper feed tray 22 is for accommodating paper.

Reference numeral 14 denotes a registration sensor, which is located upstream of the registration roller 9 and is composed of an actuator as a photo sensor for measuring the time and detecting the length of the paper. FIG. 4A shows the output signal of the registration sensor 14 when the paper is waiting on the registration roller 9 and shows the output signal of the registration sensor that withstands the conveyance of the paper after the clutch of the registration roller 9 is turned on. Is shown in FIG. Reference numeral 16 denotes a transport unit, which transports the sheets separated by the transfer / separation charger 15. A fixing device 17 fixes the sheet conveyed by the conveying section 16. A switching flapper 26 switches the conveyance path to either the reversing path 19 or the paper discharge unit 18.

The reversing path 19 has a paper sensor 23, a movable guide 19a, and a conveying roller 19b. The paper sensor 23 is for detecting the paper conveyed to the reverse path 19 side. The movable guide 19a is rotated to switch the transport path to either the transport roller 19b side or the intermediate tray 20 side. The carrying roller 19b is for carrying the paper to the outside of the apparatus.

Reference numeral 21 denotes an intermediate tray, which is a paper sensor 24.
And a flapper 20 and a paper feed roller 20a. The paper sensor 24 detects whether or not the paper is conveyed to the intermediate tray 21. The flapper 20 rotates to change the paper passage. It The paper feed roller 20 a conveys the paper to the conveyance path to the registration roller 9.

Next, the copying operation will be described. When the copy button 39 is pressed, the document on the platen is placed on the document illumination lamp 1
The reflected light from the original is illuminated by the mirrors 2, 3, 4
Is guided to the zoom lens 5, and the light passing through the zoom lens 5 is guided to the photosensitive drum 7 by the mirror 6. The photosensitive drum 7, which has been decharged by the pre-exposure lamp 25, is charged to a predetermined potential by the primary charger 13, and a latent image is written by the next exposure. The latent image on the photosensitive drum 7 is developed by the developing device 10. When toner runs out in the developing device 10,
The developer is appropriately replenished by the hopper 11. When the sheet is sent to the image forming unit, the transfer / separation charger 1
The developed image on the photosensitive drum 7 is transferred onto paper by 5 and is transferred to the fixing device 17 by the transport unit 16 after transfer.
The developed image on the paper is fixed by the fixing device 17.

Then, in the case of the one-sided copy, the sheet is ejected as it is to the sheet ejection section 18, while in the case of the two-sided copy mode and the multiplex copy mode, it is not ejected as it is and is conveyed to the reversing path 19 through the switching flapper 26. The sheets are stacked and stored on the intermediate tray 21. Then, when a predetermined number of sheets are stored, the sheet re-feeding unit separates the sheets one by one,
The paper is fed and fed again to the image forming unit. In the case of reversing paper ejection, the paper enters the reversing path 19 via the switching flapper 26, and when the movable guide 19a rotates, the conveying roller 19b stops at the rear end of the paper and is then conveyed in reverse and ejected. I will head to 18.

Then, the toner on the photosensitive drum 7 which has not been transferred onto the sheet by the transfer / separation charger 15 is scraped off and cleaned by the cleaner 12.

FIG. 3 is a flow chart showing an example of the control procedure in the multiple copy mode by the CPU 31 shown in FIG. When the multi-copy mode is set in step S101, the copy paper size is set in step S102, and then copying is started in step S103, the multi-feeder 8 (or the paper tray 22) is started in step S104. ) Starts feeding the paper. Next, in step S105, the time detected by the registration sensor 14 for the sheet being conveyed and the sheet size are detected by the conveying time, and whether the detected sheet size and the set sheet size match or not. To judge. If an affirmative decision is made, a copy operation in the setting mode is carried out at step S106, and it is decided at step S107 whether or not the paper sensor 24 of the intermediate tray 21 has detected paper within the specified time. If the determination is affirmative, it means that the normal operation is performed, and thus the process proceeds to step S108. In step S108, it is determined whether or not the set number has been completed. When a negative determination is made, the process returns to step S106,
When a positive determination is made, the process ends.

On the other hand, if a negative determination is made in step S105, that is, if the paper sizes do not match, the one-sided copy operation is performed in step S110, and the one-sided copied paper is removed from the apparatus in step S111. The sheet is discharged to the sheet, and a sheet size mismatch error is displayed in step S112. Then, after the error is released in step S113, the process returns to step S102.

On the other hand, if a negative determination is made in step S107, that is, if no paper is detected within the specified time, the copy operation is stopped in step S114, and a jam display is performed in step S115. And
In step S116, the error is released and step S1
Return to 03.

This control procedure is an example in the multiple copy mode, but in the double-sided copy mode and the reverse discharge mode, C
Since the control procedure by the PU 31 is the same, duplicate description of the control procedure in this case will be omitted.

[0025]

As described above, according to the present invention,
With the above configuration, it is possible to prevent a jam caused by the difference between the set sheet size and the conveyed sheet size.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the copying apparatus main body shown in FIG.

3 is a flowchart showing an example of a control procedure in a multiple copy mode by a CPU 31 shown in FIG.

4 is a time chart showing an example of an output signal of the registration sensor 14 shown in FIG.

FIG. 5 is a flowchart showing an example of a conventional control procedure in a multiple copy mode.

[Explanation of symbols]

 7 Photosensitive Drum 8 Multi Feeder 9 Registration Roller 10 Developing Device 14 Registration Sensor 15 Transfer / Separation Charger 17 Fixing Device 19 Reverse Path 21 Intermediate Tray 22 Paper Feed Tray 26 Switching Flapper 30 Operation Panel 31 CPU 32 Copying Machine Main Body 33 Display 34 Duplex copy mode key 35 Multiplex copy mode key 36 Reversed paper ejection mode key 37 Numeric keypad 38 Density control key 39 Copy key 40 STOP key

Claims (2)

[Claims] 1. A copying apparatus having at least one function of a double-sided copying function, a multiplex copying function, and a reverse sheet discharging function, a detection unit for detecting a size of a sheet during sheet conveyance, and the double-sided copying function. Determination means for determining whether or not the paper size detected by the detection means is the same as a preset paper size when any one of the multiple copy function and the reverse paper discharge function is selected, When a negative determination is made by the means, a control means for performing one-sided copying on the sheet without executing any selected function and discharging the sheet to the outside of the apparatus, and when a negative determination is made by the determination means, A copying apparatus comprising: a notifying means for notifying the effect. 2. The copying apparatus according to claim 1, wherein the detecting means is arranged on an upstream side of a registration roller on a sheet conveying path.