JPH05116812A - Image forming apparatus - Google Patents

Abstract

PURPOSE:To enable obtaining a copy image with a paper sheet being kept inclined and realize diversification of the picture images and expand the use purposes, by changing over to a mode, in which regular arranging of the front end edges by a resist roller is not conducted, by a selection means. CONSTITUTION:In a case where copying is performed in a first mode in which the front end edges of paper sheets are regularly arranged, a first pick-up roller 37a and a second pick-up roller 37b are driven through 'on' operation of a copying button, the paper sheet is separated and conveyed, by a first or a second separation roller 38a, 38b, toward a resist roller 32. At this time, the resist roller 32 is stopped, and the paper sheet P1 is once stopped at the position of the resist roller 32 and is regularly arranged at its front end edge. In a case where the paper sheet P1 is copied in a condition of being kept inclined by a paper feed tray 11, turning-on of a mode selection key permits a microprocessor to recognize that this mode is a second mode in which regular arranging of paper sheets is not performed. The microprocessor controls the resist roller 32 to be brought into a driven state when the front end edge of the paper sheet arrives thereat. After 'on' operation of the copying button, the copying operation is performed with a given set timing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an image forming apparatus, such as an electrophotographic apparatus, capable of adjusting a tip angle of a sheet supplied to a photosensitive member.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as an electrophotographic apparatus, the leading edge of the fed paper is temporarily placed on a stationary registration roller in both the paper feeding by a paper feeding cassette device and the manual feeding. After abutting and aligning the front ends, they were conveyed toward the transfer position of the photoconductor.

[0003]

Conventionally, the sheet is temporarily stopped at the registration roller position before being conveyed to the transfer position of the photosensitive member, and the leading ends are always aligned.

For this reason, there is a problem in that it is not possible to realize even if it is necessary to obtain the copy while the paper is slanted, and the application is narrowed.

In view of the above, the present invention eliminates the above-mentioned problems. It is possible to convey the paper in the transfer position direction of the photoconductor without changing the tip of the paper by the registration roller while keeping the inclination angle when the paper reaches the registration roller. It is an object of the present invention to provide an image forming apparatus that has a wide range of uses and high functionality by achieving diversification of image formation and image production.

[0006]

In order to solve the above-mentioned problems, the present invention provides an apparatus main body having an image forming means, a sheet supply means provided in the apparatus main body, and a sheet supply means for connecting the image forming means to the image forming means. A sheet conveyance path that reaches the sheet discharge portion through the image carrier, and a sheet that is provided between the sheet supply means in the sheet conveyance path and reaches the image carrier, and supplies the sheet supplied from the sheet supply means to the image carrier. The registration roller that is conveyed in synchronization with the toner image formed above, and the registration roller that is stopped when the leading edge of the paper arrives and the leading edge of the paper is aligned and the registration roller is passed after an arbitrary timing. Selecting means for selecting one of a first mode for driving the roller and a second mode for driving the registration roller when the leading edge of the sheet arrives and not aligning the leading edge of the sheet. This is selected by the selection means in the first mode - de or the second mode - one of de mode - is intended to provide a control means for controlling driving of La - the Rejisutoro accordance de.

In order to solve the above-mentioned problems, the present invention is directed to an apparatus main body having an image forming means, a sheet supply means provided in the apparatus main body, and an image carrier of the image forming means from the sheet supply means. A paper transport path that reaches the paper ejection section,
A registrar which is provided between the paper supply means and the image carrier in the paper conveyance path and conveys the paper supplied from the paper supply means in synchronization with the toner image formed on the image carrier. And a first mode for driving the registration roller after an arbitrary timing has elapsed after the registration rollers are stopped when the front end of the paper arrives and the front ends of the paper are aligned, and the front end of the paper. Upon arrival, the registration roller is driven, the registration roller is temporarily stopped after reaching the leading edge of the paper, and one of the second modes for re-driving the registration roller after an arbitrary timing has elapsed is selected. Selecting means and control means for controlling the driving of the registration roller according to either the first mode or the second mode selected by the selecting means. It is intended to provide.

Further, in order to solve the above problems, the present invention provides
An apparatus main body having an image forming unit, a sheet supply unit provided in the apparatus main body, a sheet conveyance path from the sheet supply unit to an ejection unit via an image carrier of the image forming unit, and in the sheet conveyance path A registration roller that is provided between the sheet supply means and the image carrier to convey the sheet supplied from the sheet supply means in synchronism with a toner image formed on the image carrier; When the leading edge of the sheet arrives, the registration roller is stopped, and after aligning the leading edge of the sheet, the registration roller is passed after an arbitrary timing.
The first mode for re-driving the roller and the registration roller are driven when the leading edge of the sheet is reached, and the registration roller is temporarily stopped after the leading edge of the sheet is reached. Selecting means for selecting one of the second modes for re-driving the motor, adjusting means for adjusting an arbitrary timing for re-driving the resist roller in the second mode, and the selecting means. A control means for controlling the driving of the resist roller is provided according to the selected one of the first mode and the second mode.

[0009]

The present invention is constructed as described above, and the second mode is provided in which the leading end is not aligned by the registration roller by the selecting means.
By switching the mode, it is possible to obtain a copy image while the paper is tilted, the image is diversified, and the application is expanded.

Further, the present invention is configured as described above, and in the second mode, the adjustment of the image position is made extremely easy by adjusting the feeding timing of the paper to the image carrier by the adjusting means. It is also possible to move the image to the image position to be changed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

FIG. 1 shows the internal construction of the entire electrophotographic apparatus that requires paper feeding. Inside the apparatus main body 1, images for charging, exposing, developing, transferring, peeling, cleaning, discharging, fixing, etc. are carried out. A forming unit 2 is built in, and an original placing table 3 on which an original is placed is provided on the upper surface of the apparatus main body 1. Reference numeral 4 is a document cover.

At the lower part of the apparatus main body 1, a paper feed cassette device 10 which is a paper feed means for holding the paper P supplied to the image forming means 2 is mounted. Further, on the right side of the apparatus main body 1, there is provided a paper feed tray 11 which is a paper insertion portion for manually feeding the paper P to the apparatus main body 1.

On the other hand, a drum-shaped photoconductor 20 is arranged substantially in the center of the main body 1 of the apparatus, and around the photoconductor 20, the charging chargear, which is well known in the art, along the rotation direction thereof.
Ja 21, exposure unit 22a of exposure device 22, developing device 2
3, a transfer charger 25, a peeling charger 26, a cleaning device 27, and a charge eliminating device 28 are sequentially arranged.

The exposure device 22 illuminates the back of an original placed on the original placing table 3 provided on the upper surface of the apparatus main body 1 with an exposure lamp 51 surrounded by a reflector 50 and is reflected from the original. The optical image is reflected by the first to third reflection mirrors-5.
2 to 54 are sequentially guided to the lens 55, and then the optical image transmitted through the lens 55 is transferred to the fourth to sixth reflection mirrors-5.
6 to 58 are sequentially guided to the photoconductor 20.

The exposure lamp 5 surrounded by the reflector 50
The first and the first reflection mirrors 52 are mounted on a first carriage 47 which is capable of reciprocating along the lower surface of the document placing table 3, and the second reflection mirror 53 and the third reflection mirror 54.
Is mounted on the second carriage 48 that moves in the same direction at half the speed of the first carriage 47.

An operation panel 40 is provided on the upper surface of the apparatus main body 1, and the operation panel 40 has a copy magnification and a copy.
Message panel 4 for displaying the number of sheets, messages, etc.
0a, a display panel 40 for displaying the operating state of the apparatus main body 1
b is provided.

Further, on the operation panel 40, a ten key which is an adjusting means for inputting a copy button 40c for starting a copy operation, the number of copies, and a change of the sheet feed start timing of each of the pickup rollers 37a and 37b which will be described later. 40
d, paper size setting key-40e, original size key-40f
And a first mode for aligning the leading edge of the paper P with
Mode and a mode selection key 40 which is a selecting means for selecting one of the second modes in which the leading ends of the paper P are not aligned.
g is provided. 40h is mode selection key 40g
Is a display LED that indicates that is turned on.

Further, in the main body 1 of the apparatus, a paper sheet fed from a paper feed cassette device 10 or a paper feed tray 11, which is a paper feeding means, is ejected through the photoconductor 20 on the left side of the main body 1 of the device. A paper transport path 31 that leads to the tray 9 is formed.

A registration roller 32 is arranged on the upstream side of the photoconductor 20 in the sheet conveying path 31, and on the downstream side thereof.
A fixing roller 33 and a paper discharge roller pair 34 are arranged.
A conveyor belt 36 is arranged between the charger 26 and the fixing roller 33. This registration roller 32 is
In the first mode, it is stopped by the microprocessor 70, which is a control means to be described later, when the leading edge of the sheet P is reached, and after the leading edge of the sheet is aligned, it is synchronized with the toner image on the photoconductor 20. In the second mode, it is controlled so as to be driven at the same speed as the rotation speed of the photoconductor 20 from the arrival of the leading edge of the paper to the end of the transportation. Has been done.

On the other hand, 37a is a first pickup roller which is a paper feeding means for taking out the papers P one by one from the paper feeding cassette device 10 and feeding them to the first separating roller 38a, and 37b is a paper feeding device. It is a second pickup roller which is a paper supply means for taking out the paper P one by one from the tray 11 and supplying it to the second separation roller 38b. Here paper P
Is synchronized with the toner image on the photoconductor 20 by the timing of taking out the paper P from each of the pickup rollers 37a and 37b.
It can be adjusted by the microprocessor 70 according to the input data from. In addition, each pickup roller 37
The sheets P taken out by a and 37b are separated one by one by the first and second separating rollers 38a and 38b and sent to the sheet conveying path 31.

Further, in the paper conveyance path 31, a manual feed switch 60, a registration roller switch 61, a paper ejection roller switch 62, and a rear end detection which are paper detection means for detecting passage of the paper P are detected. A switch 63 is provided.

FIG. 3 is a block diagram of the apparatus main body 1. The microprocessor 70, which is a control means, has a copy button 40c, a numeric keypad 40d, and a numeric keypad 40d on the operation panel 40.
Various operation keys 71 such as mode selection key 40g, or various switches for detecting the feed timing of the paper P such as the manual feed switch 60, toner density in the developing device 23, and automatic exposure detection. The sensors 72 are connected via the input interface circuit 73a. On the other hand, the microprocessor 70 receives the photoconductor 20 of the image forming means 2 of the apparatus main body 1 via the output interface circuit 73b.
Drive unit 74 for driving the developing device 23 and the like, the message panel 40a on the operation panel 40, the display panel 4
0b, the display LED 40h, etc., and controls them. Reference numeral 76 is a pulse oscillator.

Next, the operation will be described. The apparatus main body 1 completes the warm-up and is in a ready state after a lapse of a certain time after turning on a power source (not shown). Here, when the copying is performed by the first mode in which the leading ends are aligned by the registration roller, the operator places the original D on the original placing table 3, and the copy conditions such as the copy magnification and the image density are set. After inputting from the operation panel 40, the paper P is inserted from the paper feed tray 11 into the main body 1 of the apparatus in the case of manual feeding, the manual feed switch 60 is turned on at the leading end of the paper P, and the microprocessor 70 It is recognized that the copying is a manual copying by the mode of (1), the apparatus main body 1 is set to the copyable state by the manual feeding, and the copy button 40c is turned on to start the copying. On the other hand, when the paper is fed from the paper cassette device 10, the copy button 40 is pressed immediately after inputting the copy conditions.
Turn on c and start copying.

It should be noted that the microprocessor 70 is the first
When the unevenness which is the copy mode by the mode is recognized, the registration roller 32 is controlled so as to maintain the stopped state when the leading edge of the sheet is reached.

When the copying is started in this manner, the main body driving section 74 causes the image forming means 2 to move the photosensitive member 20.
Is rotated, and each step of charging, exposure, and development is sequentially performed, and a copy image is formed on the photoconductor 20.

On the other hand, on the side of the paper feed cassette device 10 or the paper feed tray 11, the copy button 40c is turned on to turn the first or second pickup roller 37a or 3a.
7b is driven to drive the first or second separation roller 38.
Separated and conveyed in the direction of the resist roller 32 by a and 38b. At this time, the registration roller 32 is stopped, and the paper P is temporarily stopped at the position of the registration roller 32 and the leading ends thereof are aligned. After that, the registration roller 32 is driven by the microprocessor 70, and the paper P is synchronized with the developer image on the photoconductor 20 by the image forming means 2 in synchronization with the photoconductor 20.
And the transfer charger 25. The paper P is peeled off after the developer image is transferred from the photoconductor 20.
The conveyor belt 3 is separated from the photoconductor 20 by the jar 26.
Then, the image is fixed to the fixing roller 33, the image is fixed, and the sheet is ejected toward the sheet ejection tray 9. After the transfer is completed, the photoconductor 20 can be copied next through the cleaning device 27 and the static eliminator 28.

Next, the operation in the second mode will be described with reference to the flow chart shown in FIG. For example, as shown in FIG. 5, when a sheet P is obliquely fed from the sheet feed tray 11 and manually fed to make one copy, the operator uses a second mode in which the leading end of the apparatus body 1 is not aligned. To turn on the mode, turn on the mode selection key 40g. As a result, the display LED 40h is turned on, and the microprocessor 70 recognizes that it is the second mode in which the leading edge of the sheet is not aligned, and controls the registration roller 32 to be in a driving state when the leading edge of the sheet is reached. In addition, the manual feed switch 60 in the paper transport path 31 and the registration roller switch 6
1, all the detection data from the paper discharge roller switch 62 and the trailing edge detection switch 63 are ignored, and after the copy button 40c is turned on, the copy operation is performed at a set arbitrary timing.

The operator places the original D on the original table 3
Then, the necessary copy conditions such as the copy magnification and the image density are input from the operation panel 40, and the paper P is conveyed to the transfer position in synchronization with the toner image on the photoconductor 20. If necessary, the timing of taking out the paper P by the second pickup roller 37b is set by the ten key 40d. That is, the image position on the paper P can be easily moved up and down by changing the timing of taking out the paper P by the second pickup roller 37b. After inputting all the necessary copy conditions in this way, the paper feed tray 11
When the copy button 40c is turned on after the manual feed switch 60 is turned on after the paper P is inserted into the apparatus main body 1, the microprocessor 70 responds to the pulse from the pulse oscillator 76 with the second timing at an arbitrary timing. Mode
The manual copy by hand will be carried out.

That is, in the image forming means 2, a copy image is formed on the photoconductor 20 in the same manner as in the first mode, while in the paper feed tray 11, it is set by the ten key 40d. The second pickup roller 37 at the timing
When b is driven, the paper P is taken into the apparatus main body 1 in the state of having the inclination when placed on the paper feed tray 11, separated and conveyed by the second separation roller 38b, and registered. It is transported to LA 32. At this time, the registration roller 3
2 is rotating at the same speed as the photoconductor 20, and the paper P is not stopped at the position of the registration roller 32, and the paper P of the photoconductor 20 is synchronized with the toner image on the photoconductor 20 while keeping the inclination. The toner image on the photoconductor 20 is transferred to the transfer position and is transferred. Next, the paper P is peeled off from the photoconductor 20 and fixed.
It is sent to the printer 33 and fixed, the inclined copy image is completed, and it is discharged onto the paper discharge tray 9. After the transfer, the photoconductor 2
0 can be copied next through the cleaning device 27 and the static eliminator 28.

After that, when copying is performed while the paper P is inclined, the paper P is placed on the paper feed tray 11.
The copy button 40c is turned on again, and the copying in the second mode is repeated. In addition, even if it is the same copy,
If the pick-up timing of the second pickup roller 37b is adjusted by the ten key 40d, the copy image at the transfer position and the paper P are out of sync with each other, and the position of the toner image on the paper P can be moved and adjusted.

After all the copying in the inclined state is completed, if the mode selection key 40g is turned off, the copying in the first mode for aligning the leading ends of the paper P is possible. Become.

With this configuration, the mode selection key 40
By turning on g, the registration
It is possible to transport the paper 32 to the side of the photoconductor 20 while keeping the inclination of the sheet P without aligning the leading edge of the sheet P, and to form an inclined copy image on the sheet P. It is also possible to copy onto a special paper that is inclined. Therefore, the copy images can be diversified, and the functions can be improved by expanding the applications.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in the operation of the registration roller 32, but is the same as the first embodiment in other respects. Therefore, the same parts are designated by the same reference numerals and their description is omitted. To do.

In this embodiment, when copying in the second mode, the second pickup load is used as in the first embodiment.
By adjusting the pickup timing of the roller 37a, the toner image on the photoconductor 20 and the paper P are not synchronized, but the arrival of the leading edge of the paper P on the registration roller 32 is detected by the registration roller switch 61. The registration roller 32 is temporarily stopped while holding the paper P, and then the registration roller 32 is re-driven so that the paper P is conveyed at a timing synchronized with the toner image on the photoconductor 20.

That is, when the manual copy is performed by the second mode, the operator turns on the mode selection key 40g as in the first embodiment, and the original D is placed on the original placing table 3. After setting, copy conditions are input from the operation panel 40, and at this time, the re-driving timing of the registration roller 32 is input from the numeric keypad 40d as required. Then copy button 4
When 0c is turned on, the apparatus main body 1 carries out a manual copy by the second mode.

On the other hand, on the side of the paper feed tray 11, the paper P placed obliquely is taken into the main body 1 of the apparatus by the second pickup roller 37b and by the second separation roller 38b. It is conveyed to the registration roller 32 side. At this time, the registration roller 32 is rotating, and the leading end of the sheet is nipped and conveyed to the registration roller 32 in an oblique state without being stopped. On the other hand, when the registration roller switch 61 is turned on by the passage of the paper P, the microprocessor 70
Recognizes that the paper P has reached the registration roller 32, temporarily stops the registration roller 32 after a lapse of a certain time, and then re-drives the registration roller 32 at a set timing, and the photoconductor 20 The sheet P is conveyed in the transfer position direction so as to be synchronized with the upper toner image. As a result, the paper P is placed on the photoconductor 2
The toner image above 0 is transferred, then peeled and fixed, and then discharged onto the discharge tray 9 in an inclined state.

After the transfer, the photoconductor 20 is cleaned by the cleaning device 2.
7. The next copy is made possible via the static eliminator 28.

According to this structure, the sheet P can be supplied to the transfer position without aligning the leading edge by the registration roller 32 as needed, and it is easy to adjust the leading edge angle of the sheet at the time of feeding. It is possible to obtain a copy image that is tilted at an arbitrary angle, and it is also possible to copy to a special type of paper whose tip is tilted. Further, since the re-driving timing of the registration roller 32 can be easily adjusted, the image shift can be easily adjusted, and the image position with respect to the paper P can be easily moved up and down. As a result, the function is improved.

The present invention is not limited to the above-mentioned embodiment, and changes can be made without departing from the spirit of the present invention. For example, in the second embodiment, the resist roller is temporarily stopped and thereafter. The timing of re-driving may be set in advance without depending on the sheet detection by the registration roller switch.

[0041]

As described above, according to the present invention, by switching the drive mode of the registration roller when the sheet is conveyed by the switching means, the transfer position can be adjusted in the registration roller without aligning the leading edge of the sheet. Since the paper can be conveyed to the paper, it is possible to transfer the toner image while the paper is still inclined in the paper conveyance path, or to copy it to a special paper with the front end inclined. The diversification is realized, the application is expanded, and the function of the image forming apparatus is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a device body according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an operation panel according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing an apparatus main body according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing the copy operation in the second mode of the first embodiment of the present invention.

FIG. 5 is a flow chart showing a copy operation in the second mode of the first embodiment of the present invention.

FIG. 6 is a flowchart showing a copy operation in a second mode of the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Device main body 2 ... Image forming means 11 ... Paper feed tray 31 ... Paper conveyance path 40g ... Mode selection key 32 ... Registration roller

Claims (3)

[Claims] 1. A main body of an apparatus having an image forming means, a paper feeding means provided in the main body of the apparatus, and a paper conveyance path from the paper feeding means to an ejection portion via an image carrier of the image forming means, A registrar that is provided between the sheet supply means and the image carrier in the sheet transport path and that transports the sheet supplied from the sheet supply means in synchronization with the toner image formed on the image carrier. A first mode for driving the registration roller after an arbitrary timing has elapsed after the registration roller is stopped when the front end of the paper arrives and the front ends of the paper are aligned. When the registration roller is driven, the registration roller is driven to select any one of the second modes for not aligning the leading edges of the sheets, and the first mode selected by the selection means. is there Or an image forming apparatus comprising a control means for controlling the driving of the registration roller according to any one of the second modes. 2. A main body of an apparatus having an image forming means, a paper feeding means provided in the main body of the apparatus, and a paper conveyance path from the paper feeding means to an ejection portion via an image carrier of the image forming means, A registrar that is provided between the sheet supply means and the image carrier in the sheet transport path and that transports the sheet supplied from the sheet supply means in synchronization with the toner image formed on the image carrier. A first mode for driving the registration roller after an arbitrary timing has elapsed after the registration roller is stopped when the front end of the paper arrives and the front ends of the paper are aligned. Of the second mode in which the registration roller is driven once, the registration roller is temporarily stopped after reaching the leading edge of the sheet, and the registration roller is re-driven after an arbitrary timing has elapsed. A selection means for selecting either,
And a control means for controlling the driving of the resist roller according to either the first mode or the second mode selected by the selecting means. Image forming apparatus. 3. An apparatus main body having an image forming means, a paper supply means provided in the apparatus main body, a paper conveyance path from the paper supply means to an ejecting section via an image carrier of the image forming means, A registrar that is provided between the sheet supply means and the image carrier in the sheet transport path and that transports the sheet supplied from the sheet supply means in synchronization with the toner image formed on the image carrier. A first mode for driving the registration roller after an arbitrary timing has elapsed after the registration roller is stopped when the front end of the paper arrives and the front ends of the paper are aligned. Of the second mode in which the registration roller is driven once, the registration roller is temporarily stopped after reaching the leading edge of the sheet, and the registration roller is re-driven after an arbitrary timing has elapsed. A selection means for selecting either,
An adjusting means for adjusting an arbitrary timing for re-driving the registration roller in the second mode, and either the first mode or the second mode selected by the selecting means. And a control means for controlling the driving of the registration roller in accordance with the above mode.