JPS61285439A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain a practically convenient image forming device by constituting the device so that an image non-formation part can be formed in an original setting reference direction in accordance with requirement. CONSTITUTION:When a binding margin is set up by binding margin setting keys 30a-30d, the width of the set binding margin is displayed on a set state display part 131. On a scale display part 130, segments 130 indicating the setting position of an original are illuminated and segments 1302 corresponding to the set width of the binding margin are turned on and off. If a binding margin setting key 30b of the X direction is depressed and the binding margin is set up to t = 10mm in the minus direction, a range indicated by the segments 1302 indicates a range to be actually copied. At that time, a power variable lens block is moved along a fixed scale 21 in accordance with the set width of the binding margin and the forming position of a copied image on paper is shifted. When a copy key 301 is depressed after setting up the binding margin, the binding margin is formed on a part shown by slashes. Thus, image formation can be easily attained.

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 its problems]

As is well known, in recent years, electronic copying machines have been developed that have a function of reducing or enlarging a document image, or a function of creating a non-forming area of an image to be used as a binding margin or the like. However, since conventional copying machines can only form binding margins in the scanning direction, for example, when reducing an A3 original and copying it to A4,
It was inconvenient that the binding margin could not be formed in the desired area.

[Object of the invention] This invention was made based on the above circumstances,
The purpose is to provide a practically convenient image forming apparatus in which a non-image forming area can be formed as required in the document setting reference direction.

(Summary of the Invention) The present invention makes it possible to form a binding margin in a direction perpendicular to the scanning direction by, for example, making a variable magnification lens block movable along a fixed scale that serves as a reference for setting a document. There is something that happened.

[Embodiments of the invention]

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

FIGS. 4 and 5 schematically show an image forming apparatus of the present invention, such as a copying machine. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document, and furthermore, a document cover 11 and a work table 12, which can be opened and closed, are provided near the document table 2. The original placed on the original platen 2 is exposed to an exposure lamp 4 and a mirror 5.
．． By reciprocating the optical system 6.7 in the direction of arrow a along the lower surface of the document table 2, exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. 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, passes through the variable magnification lens block 8, and is further reflected by the mirror. 9 and guided to the photoreceptor drum 10, the mold on the original is reflected by the photoreceptor drum 1.
The image is formed on the surface of 0.

The photoreceptor drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charger 11, and then an electrostatic latent image is formed on the surface by slit exposure of the image. This electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 15 or 16, passes through the paper guide path 17 or 18, and then passes through the registration roller. versus 19
and is guided to the transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. Furthermore, each of the paper feed cassettes 13 and 14 has a cassette size detection switch 60! , 602, the cassette size is detected. This cassette size detection switch 601.6
02 is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 2o. . This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. Then, paper P after fixing
is arranged to be placed on a tray 25 outside the main body 1 by a pair of paper ejection rollers 24. After the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, residual toner on the surface is removed by the cleaner 27, and the residual image is erased by the charge removal lamp 28, so that the drum 10 returns to its initial state. It looks like this. Note that 29 is a cooling fan for preventing a rise in temperature inside the main body 1.

FIG. 6 shows the operation panel 30 provided on the main body 1. 30r is a copy key for commanding the start of copying, 30
2 is a numeric keypad for setting the number of copies, etc., 303 is a display section for displaying the operating status of each part and paper jams, etc., 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14, and 305 is a selected key. A cassette display section for displaying the cassette, 306 a magnification setting key for setting copy enlargement and reduction magnification in a predetermined relationship, 307 a zoom key for steplessly setting the enlargement and reduction magnification, and 308 for displaying the set magnification. The display section 30e is a density setting section for setting copy density. 30a130b is a binding margin setting key in the X direction, 30c and 30d are binding margin setting keys in the X direction, 30e,
30f is a light emitting display element indicating that each of the binding margin setting gears 30a to 30d has been operated.

FIG. 7 shows an example of the configuration of a drive source for each drive section 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 lens block 8 that performs magnification change. 32 is a mirror motor, which is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification. 33 is a scanning motor, which connects the exposure lamp 4 and mirror 5.
, a motor for moving the mirror 6.7 for document scanning. 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.

A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like.

36 is a drum motor, which is a motor for driving the photosensitive drum 10. Reference numeral 37 denotes a fixing motor, which is a motor for driving the paper conveyance path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24. 38 is a paper feed motor, which is a motor for driving the delivery rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19.

A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 8 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, and these carriages 411 and 412 are guided by guide rails 421 and 422 in the direction of arrow a. It can be moved in parallel. That is, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and a first carriage 41 that supports the mirror 5 is placed in the middle of the belt 45! One end is fixed. On the other hand, a second carriage 422 supporting the mirror 6.7
The guide portion 46 includes two grooves spaced apart in the axial direction of the rail 422.
Two pulleys 47.47 are rotatably provided, and a wire 48 is stretched between these pulleys 47.47. One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the fixing 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, pulley 47
．． 47 serves as a movable pulley, the first carriage 41
1, the second carriage 422 moves in the same direction at 1/2 the speed. In addition, the first and second carriages 41i
, 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, if the paper size specified by the paper selection key 304 is (PX, PV) and the copy magnification specified by the magnification setting keys 306 and 307 is K, the copyable range (X, V) is "x- px/
Kl.

rV-PV/Kl. This copyable range (X, y)
As described later, the X direction is displayed on the scale 21, and the Y direction is displayed on the light shielding plate 4 of the first carriage 411.
It is displayed by a moving scale 53 provided on the upper surface of 1a.

The first carriage 411 is moved to a predetermined position (
It is designed to move to a home position (according to the magnification). When the copy key 301 is pressed, the first 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. 9 shows a drive mechanism for the variable magnification lens block 8. As shown in FIG. The motor 31 is configured to rotate a lead screw 61 disposed along the moving direction (y direction) of the first carriage 411. This lead screw 61 has a bushing 6 provided at one end of the board 62.
31 and 632 are screwed together, and the lead screw 61
When the is rotated, the substrate 62 is moved in the X direction.

A guide member 62 is provided at the other end of the substrate 62, and the guide member 62r is engaged with the guide rail 64 so as to be freely retractable. 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 side surface in the longitudinal direction of the support body 651, and a pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is engaged 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. 10(a), the focal length of the variable magnification lens block 8 is f, and the optical path length from the document table 2 to the variable magnification lens block 8 is ya1. Assuming that the optical path length 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/Z1 1/Va+1/yb Also, the magnification is expressed as -yb/ya. Since the focal length of the variable power lens block 8 is constant, it can be seen 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 variable power lens block 8 in the X 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. 10(b), 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 in the X direction by the motor 67, for example, by a distance x When the image on the photosensitive drum 10 is moved by 1, the image on the photosensitive drum 10 is moved by a distance x 2 expressed by the following equation.

X2-Xt xyb/ya Also, in the case of a same size copy, it will be x2 tsubo 2Xl. 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. 11 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. The main processor group 7
Reference numeral 1 denotes a high-voltage transformer 76 that detects input from an input device 75 such as an operation panel 30 and various switches and sensors, such as the cassette size detection switches 601 and 602, and drives the various chargers; The blade solenoid 27a1 of the cleaner 27, the heater 23a1 of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40.67 are controlled to perform the above-mentioned copying operation, and the scale display unit 13, which will be described later, is controlled.
0, it controls the display of the setting state display section 131 and the like.

Among the motors 31 to 40.67, motor 35.37
．． A toner motor 77 that supplies toner to the developer 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34 and 67 are controlled by the first sub processor group via a pulse motor driver 79. The motors 36, 39, and 38 are controlled by the second sub-processor group 7 through a pulse motor driver 80.
Controlled by 3. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81.
The heater 23a 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, and the first and second sub-processor groups 72 and 73 receive commands to drive and stop each motor. A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72, 73 to the main processor group 71. The first sub-processor group 72 also includes a motor 31
Position information from a position sensor 83 that detects each initial position of ~34.67 is input.

FIG. 12 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. 13 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, a count is performed based on the set value, and when the count is out, an end pulse is output to the interrupt line of the microcomputer 101. Said timer 10
2, a reference clock pulse is input. Furthermore, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output boats 103 and 104. The input/output boat 104 is connected to the motors 31 to 31 through the pulse motor driver 79.
34.67 is connected. In addition, the input/output boat 1
03 is used, for example, when outputting the status signal of each pulse motor to the main processor group 71.

FIG. 14 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. Numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set by the microcomputer 111, it counts based on the set value, and outputs an end pulse when the count is out. This termination pulse is latched by the latch circuit 173, and its output is
11 interrupt lines and I/O port input lines. Further, an input/output boat 114 is connected to the microcomputer 111, and a motor 36, 38, 39 is connected to this input/output boat 114 via the pulse motor driver 80.
is connected.

Figure 15 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in Figs. 13 and 14) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 11) is connected to the pulse motor driver 122,
．． 38.39.671. : Equivalent) (1) Each volume 1mA, B
, A, and B are connected.

Figure 16 shows a method for controlling the speed of a pulse motor.

Figure (a) shows the speed curve of the pulse motor, and Figure (b) shows the speed curve of the pulse motor.
) indicates the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually shorten, eventually become equal intervals, and then gradually lengthen again until they stop. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, tl, t2...
-tx indicates the phase switching interval time.

Next, the gist of the invention will be further explained.

As shown in FIG. 1, the fixed scale 21, which serves as the reference for setting the original described above, has a first mark indicating the copyable range of the original.
A scale display section 130 as an optical display means is provided along the longitudinal direction of the fixed scale 21. The scale display section 130 is composed of, for example, a plurality of liquid crystal display elements, and each segment 13o1 corresponds to the copyable range in the X direction determined by the above-mentioned paper size and set magnification. The lighting is selectively controlled by. In addition, Figure 1 shows all segments 1
A state in which 301 is lit is shown.

Furthermore, a setting state display section 131 serving as a second optical display means is provided at the center of the two fixed scales.

This setting status display section 131 quantitatively displays the width of the binding margin set by the binding margin setting keys 30a to 30d in the X direction and the y direction, and is constituted by, for example, a liquid crystal display element.

In the above configuration, if a binding margin is not set, depending on the selected paper size and set magnification,
Segment 1301 of scale display section 130 is lit.

FIG. 2(a) shows an A4 size copy at the same size, and only the segments corresponding to the copyable range are lit. The display control of the scale display section 130 includes, for example, a segment 1'30s that is turned on corresponding to the copyable range in the X direction determined from the copying magnification and paper size.
, 130t may be stored in the memory 140, and this position information may be read out in accordance with the copyable range.

On the other hand, when the binding margin is set using the binding margin setting keys 30a to 30d, the width of the set binding margin is displayed on the setting status display section 131. In addition, on the scale display section 130, segments 1301.1301 indicating the position where the original is set (segments indicating the copyable range) are lit, and the segments 13 corresponding to the width of the set binding margin are lit.
o2.1302 is blinking. FIG. 2(b) shows a case where the binding margin setting key 30b in the X direction is operated to set the binding margin to j-10m+ in the negative direction (downward in the figure), and the range indicated by segment °1302 is shown. indicates that this is the range that is actually copied. Also, at this time, the variable power lens block 8 described above has a fixed scale 2! , and the position where the edge of the copy is formed relative to the paper is shifted.

After setting the binding margin in this way, when the copy key 301 is operated, the binding margin is formed corresponding to the shaded area.

Further, FIG. 2(C) shows the binding margin setting key 30 in the X direction.
This shows the case where the binding margin is set to t=10 m in the plus direction (upward in the figure) by a.

When the binding margin is set in this way, the binding margin is formed in the hatched area in the figure.

Similarly, by operating the binding margin setting keys 30c and 30d, a binding margin is set in the y direction, and the setting status display section 131 displays the width of the set binding margin.

According to the above embodiment, the variable magnification lens block 8 is fixed to the fixed scale 2! The binding margin can be formed not only in the y direction but also in the x direction as desired.

Therefore, for example, even when reducing an A3 original and copying it onto A4 paper, it is possible to easily form a binding margin without changing the setting position of the original.

Further, a scale display section 130 is provided on the fixed scale 21 along its longitudinal direction, and segments 1301 of the scale display section 130 are lit and blinked as appropriate to display the copyable range in the X direction and the binding margin, and A setting state display section 131 is provided on the fixed scale 21, and the setting state display section 131 displays the width of the set binding margin.

Therefore, it is possible to visually check the set position of the original on the original platen 2 and the binding margin, so that operability is good.

Furthermore, the scale display section 13 displays the copyable range and binding margin.
I set it to 0 so that it can be used for both purposes. Therefore, it is possible to reduce the number of parts.

Next, other embodiments of the invention will be described.

In FIG. 3(a), direction display sections 141 and 142 indicating the direction in which the binding margin is formed are provided near the setting state display section 131 of the second fixed scale. The light is selectively turned on depending on the direction in which the direction is set. In other words, as shown in FIG. 3B, when the binding margin is set in the X direction, the direction display section
1 is lit and the binding margin is set in the y direction as shown in FIG. The direction in which the binding margin is set can be recognized. Even with such a configuration, it is possible to obtain the same effects as in the above embodiment.

Further, the scale display section 130, the setting state display section 131, and the direction display sections 141 and 142 are not limited to liquid crystal display elements, but can also be constructed using, for example, light emitting diodes.

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

[Effects of the Invention] As described in detail above, according to the present invention, a practically convenient image forming apparatus is provided in which the non-image forming area can be formed as required in the document setting reference direction. can.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the image forming apparatus according to the present invention, and FIG. 2 is a plan view showing only the main parts with some parts cut away showing various display sections, and FIG. 2 is a plan view showing the display operation. FIG. 3 shows another embodiment of this invention,
Figure (a) is a partially cutaway plan view showing various display sections, Figure (b) and Figure (C) are plan views shown to explain display operations, respectively, and Figures 4 and 5 are 4 is a perspective view of the image forming apparatus, FIG. 5 is a side sectional view, FIG. 6 is a plan view showing the configuration of the operation panel, and FIG. 7 is the configuration of the drive unit. Perspective views 1 and 8 are perspective views schematically showing the drive mechanism of the optical system, and Figure 9 is a perspective view showing only the main parts, showing the configuration of a variable power lens block.
Fig. 10 is a diagram showing the relationship between the operation of the variable magnification lens block and the image formed; Fig. 11 is a block diagram showing the overall control circuit; Fig. 12 is a block diagram of the main processor group;
Figure 3 is a configuration diagram of the first sub-build O setter group, and Figure 14 is a diagram of the second sub-build O setter group.
FIG. 15 is a schematic diagram showing the configuration of the sub-processor group, FIG. 15 is a schematic diagram showing the control circuit of the pulse motor, and FIG. 16 is a diagram for explaining the speed control method of the pulse motor. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 21...Fixed scale, 30...Operation panel, 30a-30d...Setting keys, 10...Photosensitive drum, 71...Main processor Group, 130...Scale display section, 131...Setting status display section, 141.142...Direction display section, t...
・Binding allowance. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 (a) Figure 3 (a) Figure 4 Figure 7 Figure 14 Figure 15 Figure 16

Claims (1)

[Claims] A scanning means that moves along the document table optically scans the document placed on the document table according to the set standard, and forms an image corresponding to the image of the document on a charged image carrier. , in an image forming apparatus that develops the image formed on the image carrier and transfers it to a transfer material, a change that is movable along the document setting reference and changes the imaging position of the reflected light image with respect to the image carrier. 1. An image forming apparatus comprising: a setting means for setting a non-forming position of an image on a transfer material; and a control means for controlling the operation of the changing means in accordance with an operation of the setting means.