JPS62123476A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of jam by using a peeling electrostatic charger to peel a transfer material in case of the first image formation and selecting the peeling electrostatic charger or a peeling tape in case of the second image formation in accordance with the classification and the state of a used form. CONSTITUTION:A form P is peeled from a photosensitive drum 10 by only a peeling electrostatic charger 19 in case of normal image formation or the first image formation of multiple or both sides image formation. Peeling due to the charger 1a or peeling due to a peeling tape 130 is selected by the operation of a peeling tape designating key or a peeling tape release key on an operation panel in accordance with the classification and the state of the used form in case of the second image formation. The tape 130 is provided in one end part in the lengthwise direction of the drum 10 and is moved to the use position and the release position. Thus, the form is peeled surely from the photosensitive drum to prevent the occurrence of jam.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical Background of the Invention and Problems Therein] Conventionally, in electronic copying machines, depending on the type of paper, the grain direction, etc., once a copy is made and the paper passes through a fixing device, the paper may curve into a concave or convex shape. .

When multiple copying or double-sided copying is performed on this curved paper, if the curved direction of the paper fed into the photoconductor drum again matches the curvature of the photoconductor drum, the action of the stripping charger alone will cause the photoconductor to fail. There was a problem in that the paper could not be separated more reliably from the drum, resulting in jams.

Therefore, a copying machine has been developed that reliably separates the paper from the photoreceptor drum by interposing a release tape between the photoreceptor drum and the paper. However, when a peeling tape is used, regardless of whether it is normal copying, multiple copying, or double-sided copying, there is a drawback that the peeling tape causes parts where the original image is not formed. Therefore, it has been desired to develop an apparatus that can select the peeling means depending on the type and condition of paper used.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose of this is to be able to form images on the entire surface without creating non-image forming areas during normal image formation, and to form images on the entire surface without creating non-image forming areas. The object of the present invention is to provide an image forming system in which a peeling means can be selected depending on the image forming method.

[Summary of the invention]

In the case of normal copying, the paper is peeled off with a peeling charger, and in the case of multiple copying or double-sided copying, depending on the type and condition of the paper used, the paper is peeled off with a peeling charger or Peeling with a peeling tape can be selected.

[Embodiments of the invention]

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

FIGS. 6 and 7 schematically show an image forming apparatus of the present invention, such as a copying machine. That is, 1 is a main body for copying, and a document table (transparent glass) 2 is fixed to the upper surface of this main body 1 to support a document. At both ends of the document table 2 are fixed scales 2t, 22, which serve as standards for setting the document.
Further, near the document table 2, a document cover 11 and a work table 12, which can be opened and closed, are provided.

The original placed on the original platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned. In this case, mirror 6.7 is 1,/2 of mirror 5 to maintain the light exposure length.
move at a speed of The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5, 6, 7, and then passes through the variable magnification lens block 8. Furthermore, mirror 9+
, 92, 93 and guided to the photoreceptor drum 1o, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charging device 11, and then the image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is visualized by adhering the toner to it by developing devices 121 and 122 which each contain red or black toner and are selectively operated as required. There is.

On the other hand, the paper (material to be transferred) P is delivered from the selected upper paper feed cassette 131, middle paper feed cassette 132, or lower paper feed cassette 133 to the feed rollers 14r, 142.1.
43 and roller pairs 151, 152, and 153, the sheets are taken out one by one, passed through a paper guide path 161, 162, and 163, and guided to a pair of registration rollers 17, and guided to a transfer section by this pair of registration rollers 17. ing. Here, the above-mentioned paper feeding force Cera 1 to 131.132.1
33 is removably provided at the lower right end of the main body 1, and either one can be selected on the operation panel described later. In addition, each of the above paper feed cassettes 131
．． 132 and 133 are those whose cassette sizes are detected by cassette size detection switches 601, 602, and 603, respectively. The cassette size detection switches 601, 602, and 603 are composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The sheet P sent to the transfer section is brought into close contact with the surface of the photoreceptor drum 10 at the transfer charger 18, so that the paper P is transferred from l to lunar on the photoreceptor drum 10 by the action of the band N device 18.
is transcribed. The transferred paper P is electrostatically peeled off from the photoreceptor drum 10 by the action of one peeling charger, or the peeling tape 130 (the first (shown in Figure (b)) is forcibly peeled off and conveyed by a conveyor belt 20, and sent to a fixing roller 21 as a fixing device provided at the terminal end of the conveyor belt 20.
By passing through this, the transferred image is fixed. After fixing, the paper P is delivered to a tray 25 outside the main body 1 by a pair of delivery rollers 22, a sorting gate 23 operated as shown by the solid line, and a pair of discharge rollers 24. After the transfer, the photosensitive drum 10 is returned to its initial state by removing residual toner on the surface with a cleaner 26 and erasing any afterimages with a static elimination lamp 27. Two cooling fans are used to prevent the temperature inside the main body 1 from rising.

On the other hand, below the copying machine main body 1, there is a multi-meter machine that enables double-sided copying on a single sheet of paper or multiple copies on the same side.
A copying unit 28 is provided. This unit 1~2
8, the above-mentioned distribution is performed by a gate 23 and a pair of paper ejection rollers 24.
, a plurality of roller pairs 28b that guide the sheets taken in by the gate 23 to the stacking section 28a;
28c and 28d are provided. In addition, the accumulation section 2
8a is provided with a delivery port 28e for delivering paper temporarily stored in the stacking section 28a. This delivery roller 28e can move up and down as shown by the arrow in the figure, depending on the thickness (number of sheets) of the stored paper. Delivery roller 2
The paper sent out by 8e is guided to a control gate 28g via a separation roller pair 28f that separates and sends out the paper one by one. When performing multiple copying, this control gate 28g is rotated in the direction of arrow M in the figure to guide the paper to the pair of registration rollers 17 via a pair of transport rollers 28h and a paper guide M28r.

Further, when double-sided copying is to be performed, the state shown in the figure is used, and the paper is guided to the reversing section 28 via a pair of conveying rollers 28j. When the paper is stored in the reversing section 28k, the control gate 28Q is rotated in the direction of arrow T in the figure, and the paper sent by the pair of transport rollers 28j is transferred to the pair of transport rollers 28i1.
, the registration roller pair 17 via the paper g inner path 281.
It is designed to guide you to. The details of the accumulation section 28a will be described later.

FIG. 8 shows the operation panel 30 provided on the main body 1. 30s is a copy key for commanding the start of copying, 302
Numeric keys are used to set the number of copies, etc.; 303 is a display unit that displays the operating status of each section and paper jams; 304 is an upper, middle, and lower paper feed cassette 13t, 132.133
30s is the cassette display section that displays the selected cassette, 30s is the enlargement of the copy,
Double'$ setting key for setting the reduction magnification in a predetermined relationship, 30
y is the zoom key that sets the magnification/reduction ratio steplessly, 3
0g is a display section that displays the set magnification, 309 is a density setting section that sets the copy density, 30a is a multiple copy designation key, 30b is a duplex copy designation key, 30c is a black designation key that designates the current @ device 122, 30d is a red designation key that designates the developing device 121; 30e is a release tape designation key that designates that reprinted paper for multiple duplication or double-sided copying is to be peeled off using the release tape 130; and 30f is a release tape that releases the release from the release tape 130. Tape release key 3C1 to 301 are multiple copy designation key 30a and double-sided copy designation key 30b, respectively.
, black designation key 3C1, red designation key 30d, release tape designation key 30e, and release tape release key 30f.

FIG. 9 shows an example of the drive source configuration of each drive unit of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the magnification changing lens block 8 for performing magnification change. Reference numeral 32 denotes a mirror motor, which connects the mirrors 5 and 6 to change the magnification.
．． Distance I between 7! This is a motor for changing 1ll (optical path length). 33 is a scanning motor, which controls the exposure lamp 4, mirror 5, and mirror 6.7 for scanning the original. This is a motor to move the machine.

A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming.

35t and 352 are developing motors for driving the developing rollers of the developing units 121 and 122, respectively. 36 is a drum motor, which is a motor for driving the photosensitive drum 10. Reference numeral 37 denotes a regular inspection motor, which connects the paper conveyance path 2o and the fixing roller pair 21.
and a motor for driving the paper ejection roller pair 24. 38 is a paper feeding motor, which is connected to the feed rollers 141 to 38;
This is a motor for driving 143. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the pair of registration rollers 17.

40 is a fan motor for driving the cooling fan 29; 401 is a pair of rollers 28b, 28C;
A motor 402 is used to drive the feed roller 28e and the separation roller pair 28f.

FIG. 10 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4
is supported by a first carriage 411, and mirror 6.7 is supported by a second carriage 422, respectively, and these carriages 411 and 412 are guided by guide rails 42s and 422 and are movable in parallel in the direction of arrow a. That is,
A four-phase pulse motor 33 drives a pulley 43. An endless belt 4 is connected between this pulley 43 and the idler pulley 44.
5 is stretched around the belt 45, and one end of a first carriage 411 that supports the mirror 5 is fixed to the middle part of the belt 45. On the other hand, the second carriage 4 supporting the mirror 6.7
Two pulleys 47.47 are rotatably provided on the guide portion 46 of the rail 422 and spaced apart in the axial direction of the rail 422, and one circle of wire 48 is passed between these pulleys 47.47. One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, as the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47 and 47 serve as movable pulleys, the second carriage 422 is 1/2 of the first carriage 411.
move in the same direction at a speed of Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotation direction of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the cassette selection key 304
Let the paper size specified by (Px, Py) be,
If the copy magnification specified by the magnification setting keys 30s and 307 is K, the close-up range (x, y) is l"x-
PX/Kl.

ry-Py/Kl. This copyable range (x, y)
In the X direction, a pointer 51 provided on the back side of the document table 2
．． 52, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411.

The above pointers 51 and 52 are connected to the pulley 5 as shown in FIG.
4.55, and is provided on a wire 57 that is suspended via a spring 56. The pulley 55 is connected to the motor 5
This motor 5
8 is rotated according to the paper size and magnification, so that the distance between the hands 51 and 52 can be changed.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. Then, when the copy key 301 is pressed, the first
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

FIG. 12 shows the rib structure of the lens block 8 for variable magnification. The motor 31 is connected to a first carriage 411
A lead screw 61 arranged along the moving direction (y direction) is rotated. Bushes 631 and 632 provided at one end of the board 62 are screwed into this lead screw 61.
1 is rotated, the substrate 62 is moved in the y direction.

A guide member 621 is provided at the other end of the substrate 62, and the guide member 621 is vibably engaged with the guide rail 64. Further, the substrate 62 includes a substrate 62 .
A movable body 65 is provided, which is movable in a direction (X direction) orthogonal to the above, and to which the variable magnification lens block 8 is attached. That is, supports 651. are provided at both ends of the moving body 65.
652 are provided, and these supports 651, 652 are guided and held by guide members 661, 662 provided on the base plate 62. Further, a rack 653 is provided on the longitudinal side surface of the support body 651, and a pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is meshed with this rack 653. Therefore, the variable power lens block 8 is moved in the X direction by driving the motor 67. In addition, the micro switches 691 and 692 are connected to the substrate 62 and the moving body 6, respectively.
This is to detect the initial position of No. 5.

Next, the relationship between the operation of the variable magnification lens block 8 and the image formed will be explained. In FIG. 13 (a), the focal length of the variable power lens block 8 is f, the optical path length from the document table 2 to the variable power lens block 8 is ya, and from the variable power lens block 8 to the photosensitive drum 10. When the optical path length of is yb and the total optical path length from the document table 2 to the photosensitive drum 10 is yc, the optical formula is expressed as follows.

1/f-1/ya+1/yb Also, the magnification is expressed as yb/ya. Since the focal length f of the variable power lens block 8 is constant, it is understood that in order to focus during variable power, it is necessary not only to change the total optical path length yc but also to change ya or yb. These ya and yb can be changed by moving the transformation lens block 8 in the y direction. Further, the total optical path length yc can be changed by moving the second carriage 412 and changing the position of the mirror 6.7.

On the other hand, as shown in FIG. 13(1), the distances between the document table 2, the variable magnification lens block 8, and the photosensitive drum 10 are kept constant, and the variable magnification lens block 8 is moved by the motor 67 in the X direction, for example, at a distance. When the image on the photosensitive drum 10 is moved by M X l, the distance 1! It is moved by IIx2.

X2 =XI XVb/Va In addition, in the case of a same size copy, In this way, by moving the variable magnification lens block 8 in the X direction, the center of the copied image can be moved.

FIG. 14 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. Main processor group 7 above
1 includes an operation panel 30 and keyaki switches and sensors, such as the cassette size detection switch 60+, 602.
A high-voltage transformer 76 that detects input from a heka device 75 such as 603 and drives the various chargers, the static elimination lamp 27, the blade solenoid 26a of the cleaner 26,
Controlling the heater 21a of the fixing roller pair 21, the exposure lamp 4, each of the motors 31 to 40, 58.67, Oyohi motors 135a and 135b, etc., which will be described later,
It performs copying operations.

The above motors 31-40.58.67.135a, 135
Among b, motor 35z, 352.37°40.40
1.402 and a toner motor 77.771 that supplies toner to the developing devices 121 and 122 is a motor driver 7.
The motors 31 to 34.67 are controlled by the first sub-processor group 72 via a pulse motor driver 79, and the motors 36°39.38, 58.135a1135b are It is controlled by the second sub-processor group 73 via the motor driver 80. In addition, the exposure lamp 4 is connected to a lamp regulator 8.
The heater 21a is controlled by the main processor group 71 via the heater control section 82. Then, commands to drive and stop each motor are sent from the main processor group 71 to the first and second sub-processor groups 72 and 73. From the second sub-processor group 72, 73 to the main processor group 71, status and signals indicating the driving and stopping states of each motor are sent.

The first sub-processor group 72 also includes motors 31 to 3.
Position information from a position sensor 83 that detects each initial position of 4.67 is input.

FIG. 15 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Furthermore, the microcomputer 91 is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93. A size switch for detecting paper size and other human power are connected to the input/output boat 94. 95 is connected to a copy condition setting switch and other human power.

Note that the input/output port 96 is an option.

FIG. 16 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71.

102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, counting is performed based on the set value, and when the count is completed, an end pulse is output to the interrupt line of the microcomputer 101. Timer 1 above
A reference clock pulse is input to 02. Also,
The microcomputer 101 receives position information from the position sensor 83, and input/output ports 103 and 104.
is connected. The input/output boat 104 is connected to the motor 31 via the seven pulse motor drivers.
~34.67 are connected. The input/output board 103 is used, for example, to output status signals of each pulse motor to the main processor group 71.

FIG. 17 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, it counts based on it, and outputs an end pulse when the count is out. This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. Further, an input/output boat 114 is connected to the microcomputer 111, and motors 36, 38, 39, 58, 135a, 135b are connected to this input/output boat 114 via the pulse motor driver 80.

Figure 18 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in FIGS. 16 and 17) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 14) is connected to the pulse motor driver 122,
．． 38.39.58.67.135a, 135b) are connected to each other.

FIG. 19 shows a method for controlling the speed of a pulse motor. FIG. 3(a) shows the speed curve of the pulse motor, and FIG. 1(b) shows the phase switching interval.

As is clear from this figure, the phase switching interval is long at the beginning;
They gradually shorten, then become evenly spaced, then gradually lengthen again, and then stop. That is, this shows the slew-up and slew-down of the pulse motor, and initially the self-starting fIAI+
It rises from 1, is used in a high speed region, and then falls. Note that tl, t2, . . . tx indicate the time of the phase switching interval.

Next, the gist of the invention will be explained. In this embodiment, during normal copying, the paper is peeled off using a single peeling charger, and in the case of multiple copying or double-sided copying, the paper is peeled off using a peeling tape 130. Is there a large number of meters? ! In the case of copying or double-sided copying, the paper that has been stacked once is moved to the peeling tape 130 side inside the stacking section 28a of the multiple copying unit 28,
Furthermore, the variable magnification lens block 8
is also being moved. Furthermore, even in the case of refeeding paper during multiple or double-sided copying, if it is possible to peel only with the peeling charger 19, it is possible to select peeling with a single peeling charger by operating keys on the operation panel 30. It is said that

FIG. 1(a) shows the above-mentioned accumulation section 28a. This stacking section 28a is provided with side plates 131 and 132 spaced apart by a predetermined distance in a direction perpendicular to the direction in which paper enters, and these side plates 131 and 132 are movable in the direction toward each other or in the direction away from each other. It is said that That is, racks 133 are mounted on the side plates 131 and 132, respectively.
a, 133b are provided, and these racks 133a
, 133b are meshed with binions 134a and 134b. These pinions 134a and 134b are rotated by motors 135a and 135b, respectively, and the side plates 131 and 132 are moved in the direction of the arrow shown in the figure by the driving direction of these motors 135a and 135b.

On the other hand, as described above, a peeling tape 130 is provided at one longitudinal end of the photosensitive drum 10, as shown in FIG. 1(b). This peeling tape 130 is provided at a position slightly apart from the conveyance path of the paper P that is conveyed during normal copying. The paper P can be peeled off only by 19, and the entire original image can be copied during these copying operations.

In the above configuration, the operation will be explained. First, when performing normal copying, a document is set on the document table 2 and the copy key 301 on the operation panel 30 is operated. Then, as described above, the first carriage 411 and the photoreceptor drum 10
is operated, and the original image is transferred onto the paper P. After this,
The paper P is separated from the photosensitive drum 10 by the separation charger 19 and discharged.

On the other hand, as shown in FIG. 1B, for example, when the multiple copy designation key 30a or double-sided copy designation key 30b of the operation panel 30 is operated after the original G is set on the document table 2, the main processor group 71 is set to multiple copy mode or double-sided copy mode. In this multiple copy mode or double-sided copy mode, the main processor group 71 performs operations as shown in FIG. First, in step STI, it is determined whether or not the copy key 301 has been operated. As a result, copy key 3
If 01 is operated, in step ST2, the previous)! The image of the original G is copied onto the paper P by the same operation as normal copying, and the copied M1P is supplied to the multiple copying unit 28. This multiple copying unit 28
When the paper P that has been copied is fed in, in step ST3, the side root 131 of the stacking section 28a described above is operated.

That is, as shown in FIG. 3(a), the side plates 131.13
2 is normally set to a maximum of wmax, and when paper P is fed into the stacking section 28a, a gap of δ1 is generated between the side plate 131 and the paper P, and a gap of δ1 is generated between the side plate 132 and the paper P. The setting is such that a gap of 62 is generated between the two. Then, when the paper P is sent to the stacking section 28a, the sub-processor group 73 is operated under the control of the main processor group 71, and the motor 1 is operated via the pulse motor driver 80.
35a is rotated, and the side plate 131 is moved in a direction approaching the side plate 132 by approximately a distance δ1+62. Therefore, as shown in FIG. 3(b), the sheets P sent to the stacking section 28a are placed on the side plate 132 side, that is, on the side of the peeling tape 130.
pulled to the side. Thereafter, the motor 135a is reversely rotated, and the side plate 131 is returned to the position shown by the solid line in FIG. 3(b).

Thereafter, in step ST4, the number of sheets set from the operation panel 30 is determined, and the above operation is repeated until the set number of sheets has been copied.

In step ST4, when it is determined that the set number of valves have been copied, the side plate 131 is moved as shown in FIG. 3(b).
As shown by the dotted line in , it is stopped at a position separated from the side plate 132 by a distance Wp. This distance Wp is approximately equal to the width of the paper P. After this, in step STs, it is determined whether or not the release tape release key 30f of the operation panel 30 is operated. As a result, the release tape release key 30
If it is determined that f is not operated, the motor 67 is driven via the sub-processor group 72 and the pulse motor driver 79 in step ST6, and the variable power lens block 8 is moved as shown in FIG. It is moved along the fixed scale 21 by a distance δ2/2. therefore,
The position of the original image formed on the photosensitive drum 10 and the position of the paper P that has been moved by the distance δ2 are matched.

In this case, for example, if another original is set on the original table 2 and the copy key 301 is operated again, in step ST7,
This is determined, and a multiplex or double-sided copying operation is performed in step STs. That is, the delivery roller 28e is driven, and by this delivery roller 28e,
The sheets P accumulated in the accumulation section 28a are taken out as shown in FIG. 3(C). This taken out paper P is conveyed one by one to the control gate 28g by a pair of separation rollers 28f,
This control gate 28Q allows the photosensitive drum 1 to
Q, or is reversed by the reversing section 28 and supplied to the photoreceptor drum 10. At the same time, the first carriage 411 and the photoconductor drum 10 are driven, and the variable magnification lens block 8 causes the photoconductor drum to align the image of the document set on the document table 2 with the position of the supplied paper P. 10. The image formed on the photosensitive drum 10 is transferred to a supplied paper P, and this paper P is peeled off by a peeling tape 130. Therefore, in the case of multiple copying or double-sided copying, the peeling tape 130
An image will not be formed for the width of . In this way, the paper P on which multiple or double-sided copies have been made is discharged via the pair of fixing rollers 21. After that, in step STa, it is determined whether or not all the sheets stored in the stacking section 28a have been copied. If the copying has not been completed yet, the control is transferred to step STa, and the above operation is performed. repeated. If all the copying operations are completed, the control proceeds to step 5T10, where the variable magnification lens block 8 is returned to the equal magnification tank weight position, and thereafter, all processing is completed.

On the other hand, if it is determined in step STs that the release tape release key 30f has been operated, the control is shifted to step STIt.

In this step 5T11, the motors 135a and 13 are
5b is driven, and the side plates 131 and 132 are moved by a distance δ2, as shown by dotted lines in FIG. 3(d). For this reason,
This means that the sheets stacked a distance δ2 toward the side plate 132 have been moved to a position that does not correspond to the release tape 130 again. In this state, if you operate the copy key 301 after setting another original on the original table 2, step S
At TI 2 this is determined and control is passed to step S
Moved to Tr 3. In step 5T13, only one stripping charger is used to perform the multiplex or double-sided copying operation as described in step STa. By the way, during a multiplex or duplex copying operation using only the peeling charger 19, paper jams may occur. In such a case, the release tape designation key 30e may be operated. step STI
4, it is determined whether or not this release tape designation key 30e has been operated, and as a result, the release tape designation key 30e is
If has been operated, control moves to step 5T15. In this step 5T1sr, the motors 135a, 1
35b is driven, and the side plates 131 and 132 move as shown in Fig. 3(d).
The peeling tape 130 is moved to the position shown by the solid line, and the peeling tape 130 is removed again.
The setting is such that the paper is peeled off using the .

Thereafter, the control is transferred to step STs, and after the variable magnification lens block 8 is moved, the multiplexing or double-sided copying operation described above is performed. Further, the step ST
If it is determined in step I4 that the release tape designation key 30e has not been operated, it is determined in step 5T1s whether multiple or double-sided copying has been completed for all sheets stored in the stacking section 28a. be done. As a result, if the copying operation has not been completed yet, the control is transferred to step 5T13 and the copying operation described above is repeated.

On the other hand, if it is determined in step STI a that all copying operations have been completed, control proceeds to step 5T17.
will be moved to In this step STI 7, it is determined whether a predetermined time, for example 20 seconds to 30 seconds, has elapsed. If this time has elapsed, the motor 135b is driven in step 5T1B, and the side plate 132 is
It is set so that it is returned to the position shown by the solid line in Figure (d) and forcibly peeled off using the peeling tape 130. Then, all processing is completed.

According to the above embodiment, during normal copying operation, multiple copying, or the first copying in double-sided copying, the stripping charger 19
When performing multiple copying or double-sided copying, the paper is peeled off from the photosensitive drum 10 by pressing the release tape designation key 30e or release tape release key 30f on the operation panel 30. Peeling using the charger 19 or peeling tape 130
Peeling using can be selected. Therefore, since the peeling means can be selected depending on the type and condition of the paper being used, for example, when copying for the second time, the peeling tape 13
If peeling is possible without using 0, use electrifier 1 for peeling.
9, it is possible to remove the uncopied portion of the original image in multiple or double-sided copying.

Further, when using the peeling tape 130 or releasing the peeling tape 130, this is done by moving sides #1131 and #132 in the stacking section 28a of the multiple copying unit 28. Since this configuration is relatively simple, it is possible to suppress the increase in size of the device, and it is also possible to align the sheets supplied to the stacking section 28a at the same time, so that it is possible to align the sheets supplied to the stacking section 28a at the same time, so that it is possible to align the sheets supplied to the stacking section 28a at the same time. ,
This is advantageous in practice because it can prevent paper jams and the like.

Furthermore, during multiple copying or the second copy in double-sided copying, the variable magnification lens block 8 is moved to 1/2 the amount of paper movement.
The position of the original image formed on the photosensitive drum 10 is made to match the position of the supplied paper.

Therefore, an image is not formed on the paper only in the portion corresponding to the release tape, and it is possible to minimize the number of non-image forming portions.

Furthermore, after a predetermined period of time has elapsed after the use of the release tape 130 has been canceled and multiple copying or double-sided copying has been performed, the side plate 132 is automatically returned to its original position. When using paper, peeling is performed using a peeling tape 130. therefore,
Even if the user unintentionally makes multiple copies or double-sided copies, the second copy is forcibly removed using the release tape 130, which prevents jams from occurring. It is possible.

In the above embodiment, when performing multiple copying or double-sided copying, two types of originals were sequentially set on the fixed scale 21, but as shown in FIG. set, and in response to a single operation of the copy key 301, the first carriage 411 first exposes and scans the original IGa for the set number of sheets, and then scans the original 11XGb to perform multiple copying or double-sided copying. It is also possible to perform this automatically. Even with such a configuration, it is possible to obtain the same effects as in the above embodiment.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, during normal image formation, it is possible to form an image on the entire surface without creating a non-image forming area, and when forming multiple or double-sided images, it is possible to form an image on the entire surface. It is possible to provide an image forming apparatus in which a peeling means can be selected depending on the type and condition of the transfer material.

[Brief explanation of drawings]

The drawings show an embodiment of the image forming apparatus according to the present invention, and FIG. 1(a) is a perspective view of the main parts shown for explaining the configuration of the stacking section, and FIG. FIG. 2 is a plan view for explaining the tape; FIG. 2 is a diagram for explaining the operation of multiple copying and double-sided copying; FIG. 3 is a perspective view of the main parts for explaining the operation of the stacking section; FIG. 4 is a plan view showing the operation of the variable magnification lens block during multiple copying or double-sided copying, FIG. 5 is a plan view showing another embodiment of multiple copying or double-sided copying, and FIG. 7 shows the configuration of the image forming apparatus, FIG. 6 is an external perspective view, FIG. 7 is a side sectional view, FIG. 8 is a plan view showing the configuration of the operation panel, and FIG. 9 is a drive unit. FIG. 10 is a perspective view schematically showing the drive mechanism of the optical system;
FIG. 11 is a perspective view schematically showing the drive mechanism of the pointer;
Fig. 12 shows the configuration of the variable magnification lens block, and is a perspective view showing only the main parts, Fig. 13 is a diagram showing the relationship between the operation of the variable magnification lens block and the image formed, and Fig. 14
15 is a block diagram showing the overall control circuit, FIG. 15 is a block diagram of the main processor group, FIG. 16 is a block diagram of the first sub-processor group, FIG. 17 is a block diagram of the second sub-processor group, FIG. 18 is a schematic configuration diagram showing the control circuit of the pulse motor, and FIG. 19 is a diagram shown for explaining the speed control method of the pulse motor. DESCRIPTION OF SYMBOLS 1... Main body, 2... Original table, 8... Lens block for variable magnification, 10... Photosensitive drum, 28... Multiple copying unit, 28a... Accumulating unit, 3o... Operation panel, 30a...Multiple copy designation key, 30b...Double-sided copy designation key, 71...Main processor group, 131
．． 132...Side plate, 135a, 135b--Mo9゜Applicant's representative Patent attorney Takehiko Suzue (a) Figure 1 (b) Figure 3 (C) Figure 3 (d) Figure 3 d1′τ 12 “1 Fig. 13

Claims (4)

[Claims] (1) a scanning means that moves along a document table and optically scans a document placed on the document table according to a setting standard;
An image carrier on which an image corresponding to the original image guided by the scanning means is formed, a transfer means for transferring the image formed on the image carrier onto a supplied transfer material, and the transferred material. and a conveyance means for conveying the transfer material to the transfer means side again, and capable of forming multiple or double-sided images, the image forming apparatus comprising: a first peeling means for electrically peeling off the transfer material from the image carrier; a second peeling means that is provided at a position slightly apart from the transfer path of the transfer material during normal image formation and is capable of peeling the transfer material from the image carrier; a moving means for moving to a position corresponding to or a position not corresponding to the second peeling means; a selection means for selecting the first peeling means and the second peeling means;
When forming multiple or double-sided images, the first image formation is performed by peeling off the transferred material by the first peeling means, and the second image formation is performed by operating the moving means according to the selection state of the selection means, 1. An image forming apparatus comprising: a control means for peeling off a transfer material by the first or second peeling means. (2) The image forming apparatus according to claim 1, wherein the first peeling means is a peeling charger. (3) The image forming apparatus according to claim 1, wherein the second peeling means is a peeling tape. (4) The image forming apparatus according to claim 1, wherein the moving means is provided in a stacking section of the conveying means.