JPS6218534A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce operational errors by checking an image forming range with respect to the full width of an original such as a book. CONSTITUTION:When an upper cassette to which a paper in B5 size is set is selected, a book indication key 30a is keyed in. Through use of a microcomputer 101, a main processor group 71 drives a motor 33, and accordingly the 1st carriage 411 is shifted in a direction a' from a point A and set at a point B corresponding to width in B4 size (width when the book is opened). When an operator moves a cursor 53 to a point C, that is, by delta1 at the left side, with the aid of a moving key 30c or 30d. Namely, according as the moving key 30c or 30d is keyed in, the main processor group 71 drives the motor 33 to shift the 1st carriage 411, and therefore a fixed scale plate 21 and a scale 53 at the point C show the actual width y5 of the book by moving the cursor 53 to the point C from the point B.

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 impropriety of inventions and their problems]

Generally, electronic copying machines have been developed that can continuously copy thick two-page manuscripts like books one by one (page continuous copying).
It has been put into practical use. However, with such a device, in the case of a thick document such as a book, even if the book size is 85 mm, if the book is unfolded and placed on the document table, its width will be B4.
It became.

However, the copy range at this time is determined by the size of the paper stored in the paper cassette and the copy magnification, such as the B5 position, and it is not possible to check the copy range for the entire width of the book. Ta.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that can confirm the image forming range over the entire width of a document such as a book, and that can reduce operational errors.

[Summary of the invention]

In order to achieve the above object, the present invention sets a scale for specifying the image formation range in the horizontal direction with respect to the original image to a width corresponding to two pages of the original when specifying image formation on an original such as a book. The object is moved to a position corresponding to the .

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to the drawings.

5 and 6 schematically show an image forming apparatus, such as a copying machine, according to the present invention. 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. Fixed scales 21 and 22 are provided at both ends of the document table 2 in the longitudinal direction to serve as a reference for setting the document, and a document cover 1ri that can be opened and closed and a work table 12 are provided near the document table 2. There is. The original placed on the original table 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 moving back and forth in the direction of arrow a along the lower surface of the original table 2. It is designed to be exposed and scanned at times. In this case, mirror 6.7 moves at 1/2 the speed of mirror 5 so as to maintain the light exposure. 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 5.6.7. 9 and reflected by the photoreceptor drum 10
The image of the document is formed on the surface of the photosensitive drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by a charging device 11, and then an image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by a developer 12.

On the other hand, the paper (transfer material) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery row 515 or 16. The taken out paper P is guided to a pair of registration rollers 19 through a paper guide path 17 or 18, and guided to a 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. Note that the cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. This cassette size detection switch 60! , 602 are constituted by a plurality of microswitches that are turned on and off in accordance with 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 100 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. This transferred paper P is transferred to the peeling charger 2
1, it is electrostatically separated from the photosensitive drum 10 and conveyed by the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22, and by passing therethrough, the transferred image is is established. After fixing, the paper P is transferred to a tray 25 outside the main body 1 by a pair of paper ejection rollers 24.
It is designed to be discharged. After the transfer, the photosensitive drum 10 is neutralized by a snow removal charger 26, residual toner on the surface is removed by a cleaner 27, and afterimages are roughly erased by a static elimination lamp 28.
It is set to return to the initial state. In addition, 29 is the main body 1
This is a cooling fan to prevent the temperature inside the unit from rising.

FIG. 7 shows the operation panel 30 provided on the main body 1. 30t is a copy key for commanding the start of copying, 302
303 is a numeric keypad for setting the number of copies, etc.; 303 is a display section for displaying the operating status of each section or paper jam, etc.;
4 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 305 is a cassette display section for displaying the selected cassette; 305 is a magnification setting key for setting copy enlargement and reduction magnification in a predetermined relationship; 307 is a zoom key for steplessly setting the enlargement/reduction magnification, 30e is a display section for displaying the set magnification, 309 is a density setting section for setting copy density, and 30a is for specifying that the original to be copied is a book. Book designation key, 30b is the book designation key 30 mentioned above
30C is a movement key that moves the cursor 53, that is, the first carriage 411 (in FIG. 9) to the left; 30d is a movement key that moves the cursor 53, that is, the first carriage 411 (the ninth (in the figure)
FIG. 8 shows an example of the drive source configuration of each drive unit of the duplicator constructed 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 for performing magnification change. , 32 is a mirror motor, and the distance between the mirror 5 and the mirror 6.7 (
This is a motor for changing the optical path length. A scanning upper 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. 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. 35 is a developing motor, and the developing device 1
This is a motor for driving the developing roller No. 2, etc. 3
A drum motor 6 is a motor for driving the photosensitive drum 10.

A fixing motor 37 is a motor for driving the paper conveyance path 22, the C fixing roller pair 23, and the paper ejection roller pair 24. 38 is a paper feed motor, which is a motor for driving the delivery row 515.16. 39
is a paper feeding motor, which is a motor for driving the pair of registration rollers 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 9 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, respectively, and these carriages 411, 412 are guided by guide rails 421, 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 one end of a first carriage 41 which supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, two pulleys 47.47 are rotatably provided in the guide portion 46 of the second carriage 422 that supports the mirror 6.7 and are spaced apart in the axial direction of the rail 422. A wire 48 is strung around. One end of this wire 48 is connected to the fixed part 8I149, and the other end is connected to the fixed part 49 via the coil spring 5o.
are fixed respectively. Also, a first carriage 41 is located in the middle of the wire 48! One end is fixed. 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 act as movable pulleys,
The second carriage 422 is moved in the same direction as the first carriage 411 at 1/2 the speed.

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, the first carriage 411 is moved to a predetermined position (a position indicating the width of the copyable range) by driving the motor 33 according to the paper size, magnification, and designation of the book document.

Roughly speaking, the first carriage 411 is used when specifying a book manuscript.
When the movement key 300.30d is turned on, the motor 33 is driven to move from the predetermined position in the a direction (leftward direction) or the a' direction (rightward direction). 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 document is completed, the lamp 4 is turned off and the first carriage 41 returns to the predetermined position or the position set by the movement keys 30c and 30d.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper selection key 304
Let the paper size specified by (PxlPy) be
If the copy magnification specified by the magnification setting keys 306 and 307 is K, the copyable range (x, y), rx-Px
/K.J.

It becomes ry-Py/KJ. This copyable range (x, y)
As shown in FIG. 10, the X direction is indicated by pointers 51 and 52 provided on the back surface of the fixed scale plate 21 provided at the left end of the document table 2, and the y direction is indicated by the first
It is displayed by a scale 53 provided on the upper surface of the carriage 41.

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.

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. Main processor group 7 above
1 includes an operation panel 30 and various switches or sensors, such as the cassette size detection switch 60+.
, 602, etc., and detects an input from an input device 75 and drives the various chargers, the static elimination lamp 28, and the blade solenoid 27a of the cleaner 27.
, the heater 23a of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40.58, etc., to perform the above-described copying operation.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 77 that supplies toner to the developing unit 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
are controlled by the first sub-processor group 72 via a pulse motor driver 79, and the motors 36, 39, 38, 58
is controlled by the second sub-processor group 73 via the pulse motor driver 8o. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. The main processor group 71 includes first and second sub-processor groups 72.7.
Drive and stop commands for each motor are sent to the first motor. Second
From sub-processor group 72 and 73 to main processor group 7
1, a status signal indicating the driving or stopping state of each motor is sent. The first sub-processor group 72 also includes a position sensor 83 that detects each initial position of the motors 31 to 34.
Location information has been entered from.

FIG. 12 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter abbreviated as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Further, 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, and a size switch for detecting paper size and other inputs are connected to the input/output boat 94. A copy condition setting switch and other human power are connected to the output boat 95. 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, and when a set value is set from the microcomputer 101, it counts based on it, and when it has counted out, it sends an end pulse to the interrupt line of the microcomputer 101. Output. A reference clock pulse is input to the timer 102. 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 34.135 via the pulse motor driver 79. The input/output board 103 sends the status signals of each pulse motor to the main processor group 71.
Used when outputting to.

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.

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, and 58 are connected to the input/output boat 114 via the pulse motor driver 80.

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 seven pulse motor drivers 80 in FIG.
．． 38.39) are connected to each other.

FIG. 16 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 indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. Note that t, , t2, . . . , tx indicate the time of the phase switching interval.

Next, the operation of such a configuration will be explained with reference to FIGS. 1 to 4. For example, after the power is turned on, it is checked in response to a signal from the main processor group 71 whether or not paper P remains on a paper transport path (not shown). If there is no remaining, the main processor group 71 detects the upper cassette 1 by the detection signal from the detection switch 60+.
3, and outputs an initialization signal for the optical system and a signal indicating the length and width of the paper P to the microcomputer 101 according to the result of this judgment. Then, the microcomputer 101 drives the motor 33 using the pulse motor driver 79 to drive the first. By moving the second carriages 411 and 412 and driving the motor 58, the hands 51 and 52 are moved.

Then, the microcomputer 101 moves for a predetermined time after the initial position detection signal for the motor 33 is output from the position sensor 83 (point A), that is, until the scale 53 reaches the long copyable range in the paper conveyance direction (y direction). let

Further, the microcomputer 101 moves the motor 58 for a predetermined time after the initial position detection signal is output from the position sensor 83, that is, until the hands 51 and 52 reach the width of the paper (copyable range: X direction).

Furthermore, the microcomputer 101 uses the pulse motor driver 79 to drive the lens motor 31, the mirror motor 32, and the shutter motor 34, thereby moving the lens, mirror, and shutter to the initial position and then to the equidistant position. , complete initialization. Further, when the power is turned on, the main processor group 71 turns on the fan motor 40 by driving the motor driver 78, and turns on the heater 23a by controlling the heater control section 82. Then, when the temperature of the heater 23a reaches a temperature that allows fixing, the main processor group 71 displays a message indicating that copying is possible.

In such a state, as shown in FIG. 1, if a B5 size book is opened (B4 size) and copies are to be made for each person, the operator first inserts the book designation key 30a. . Then, the main processor group 71 determines whether to copy the book manuscript (page continuous copying), sets the book manuscript mode, and outputs this mode to the microcomputer 101. Then,
The microcomputer 101 drives the first carriage 411 by driving the motor 33 using the pulse motor driver 79.
As shown in factor 2 (a) and (b), move the copyable range (fixed scale) corresponding to the two specified sheets of paper.
, and the horizontal direction width (width in the y direction) is set at the designated point B.

For example, if the book designation key 30a is pressed while the upper cassette in which B5 paper is set is selected, the main processor group 71
Turn on b. Next, the main processor group 71 uses the microcomputer 101 to drive the motor 33.
As shown in FIG. 2(a), the first carriage 411 is
Move from the point in the a' direction and set at point B, which corresponds to the width of the B4 size (the width of the open book).

In response to such instructions, the operator sets the copy surface of the book within the copyable range as shown in FIGS. 1 and 2 (a) and (b). Next, the operator presses the movement key 30C.
, or 30d to move the cursor 53 to the 0 point, that is, to the left by δ. That is, in response to input of the movement key 30c or 30d, the main processor group 71 drives the motor 33 to move the first carriage 411, thereby moving the cursor 53 from point B to point 0.

As a result, 2 fixed scale plates and 0 point scale 53
shows the actual width (y5) of the book.

Thereafter, the operator inserts the copy key 301.

Then, the main processor group 71 determines that continuous copying of B5 size pages of a book manuscript is to be performed, and outputs this determination result to the microcomputer 101. As a result, the microcomputer 101 drives the motor 33 so that the first. 2nd carriage 4
11. Move 412 in direction a. When the point D is reached, the microcomputer 10
1 by driving the motor 33 in the opposite direction.
The second carriages 411 and 412 are moved in the a' direction to point E (a position offset by 62 points from the center of the book). Here, the distance between point D and point E corresponds to the width (yl) of the B5 size image forming range based on the scale 53. At this time, the microcomputer 91 controls the exposure lamp 4 to turn on.

Thereby, the light from the exposure lamp 4 is irradiated onto the left page G1 of the book. The reflected light from the left page G1 reaches the mirror 9 via the mirrors 5, 6.7 and the lens block 8, is reflected by the mirror 9, and is guided to the photosensitive drum 10. As a result, an electrostatic latent image of the left page G1 is formed on the photoreceptor drum 10, and as the photoreceptor drum 10 rotates, this electrostatic latent image is sent to the developing device 12 and developed. At this time, the paper P from the paper feed cassette 13 is taken out and sent between the photosensitive drum 10 and the transfer charger 20 via the registration rollers 19. Here, the image on the photoreceptor 10 is transferred to the transfer charger 2.
0 is transferred to the surface of the paper P, and after this transfer,
It is peeled off by the action of the peeling charger 21. Then, the sheet P on which the image has been transferred is conveyed to a pair of fixing rollers 23 by the running of the conveyor belt 22, where the image is fixed, and is discharged by a pair of discharge rollers 24 and 24. Next, the next sheet P is taken out from the sheet cassette 13 and guided to the registration rollers 19.

Next, as shown in FIGS. 4(a) and (b), the microcomputer 1
01 drives the motor 33 and the first. 2nd carriage 4
11,412 is moved slightly back from point E in the direction a to point 0. Here, the distance between point E and point C corresponds to the width (yl) of the image forming range of B5 size with reference to the fixed scale plate 21. At this time, the microcomputer 91 controls the exposure lamp 4 to turn on.

Thereby, the light from the exposure lamp 4 is irradiated onto the right page G2 of the book. The reflected light from the right page G2 reaches the mirror 9 via the mirror 5.6.7 and the lens block 8, is reflected by the mirror 9, and is guided to the photoreceptor drum 101.1''. 0, an electrostatic latent image of the right page G2 is formed, and this electrostatic latent image is sent to the developing device 12 and developed by the rotation of the photosensitive drum 10. At this time,
Paper P guided by registration rollers 19 is sent between photosensitive drum 10 and transfer charger 20. here,
The image on the photoreceptor 10 is transferred to the surface of the paper P by the action of the transfer charger 20, and after this transfer, the peeling charger 21
It is peeled off by the action of Then, the paper P on which the image has been transferred is transferred to the fixing roller pair 23 by the running of the conveyor belt 22.
The image is fixed there and passed to a pair of paper ejection rollers 24.
．． 24.

Furthermore, when performing continuous copying of a plurality of sheets, a plurality of copies are made for the left page G1, and then a plurality of copies are made for the right page G2.

Therefore, when copying a book consecutively every 8 pages,
By specifying the book manuscript before placing the book on it, the width of the copyable area corresponding to the open state of the book is indicated with a cursor, making it easy to see where the book is placed and preventing operator mistakes. can.

Also, when copying pages on the left side of a book, it can be done within the copy range of B5 based on the fixed scale plate, that is, the left edge of the book, and when copying pages on the right side of the book, it can be done on the right edge of the book. This can be done within a B5 copying range based on .

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can confirm the image forming range for the entire width of a document such as a book, and can reduce operational errors.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram for explaining the state in which a book is placed, FIG. 2 is a diagram for explaining the state in which the cursor is moved, and FIGS. The figures are for explaining the image forming range, Fig. 5 is an external perspective view, and Fig. 6 is a diagram for explaining the image forming range.
7 is a plan view showing the structure of the operation panel, FIG. 8 is a perspective view showing the structure of the drive section, FIG. 9 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. Fig. 10 is a perspective view schematically showing the pointer drive mechanism, Fig. 11 is a block diagram showing the overall control circuit, Fig. 12 is a block diagram of the main processor group, and Fig. 13 is a block diagram of the first sub-processor group. Configuration diagram, 1st
FIG. 4 is a block diagram of the second sub-processor group, FIG. 15 is a schematic block diagram showing a pulse motor control circuit, and FIG. 16 is a diagram for explaining a pulse motor speed control method. 1...Main body, 2...Original table, 2! ... fixed scale plate 10 ... photoreceptor drum, 30 ... operation panel,
30a...Book specification key, 30b...Display unit, 3
0C130d...Movement key, 33...Motor, 41
1...First carriage, 53...Cursor, 71...
・Main processor group, G1 ・Left page of the book, G2・
...Right page of the book. Applicant's agent Patent attorney Takehiko Suzue 1 Figure (b) Figure 4 Figure 58 Figure 8 Figure 10

Claims (2)

[Claims] (1) In an image forming apparatus that optically scans a document placed on a document table and transfers an image corresponding to the image of the document onto a transfer material, the document is movably provided at the bottom of the document table. a scale for specifying a horizontal image formation range for an image; a specification means for specifying image formation for a plurality of originals placed on the document table; An image forming apparatus comprising: a moving means for moving to a position corresponding to a width of the image forming apparatus. (2) The image forming apparatus according to claim 1, wherein the plurality of originals placed on the original table are open books.