JPH01270076A - Copy magnification setting device - Google Patents

Abstract

PURPOSE:To easily take a variable power copy by finding the length X from the front edge of and original to a 1st operation piece and the length Y to a 2nd operation piece, setting Y/X as copy magnification, and driving a magnification operation mechanism according to it. CONSTITUTION:The 1st operation piece 28 is positioned at the rear edge position of an original image and then the 2nd operation piece 29 is positioned at a position corresponding to the size after copying to specify variable power. Then reed switches SW3 and SW4 detect permanent magnets 32a, 29a, and 28a by the movement of a scanner 6 and output detection pulse signals to a CPU. The CPU calculates the number n1 of pulses in a period between the detection of the magnet 32a, and the detection of the magnet 29a and the number N2 of pulses in a period from the detection of the magnet 32a and the detection of the magnet 28a to find N1/N2 as variable power, which is allowed to correspond to X/Y. When the peripheral speed of a photosensitive drum is denoted as (v), the moving speed of the scanner 6 is set to v/(Y/X) and then a copy corresponding to the variable power is taken.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying magnification setting device provided in an image forming apparatus such as a copying machine.

A typical prior art of this type of copying magnification setting device is configured such that a magnification ratio is entered numerically by pressing a numeric keypad provided on an operation panel, and the input magnification ratio is displayed on a display unit. ing.

Further, in another prior art, a zoom key provided on an operation panel is pressed, and a plurality of preset magnification ratios can be selected and a desired magnification can be set.

Further, a typical prior art of a variable magnification setting device that sets a variable magnification ratio in a stepless manner is shown in FIG.

71 is a guide groove, and 72 is an operation knob movable along the guide groove 71. Scales are carved on both sides of the guide groove 71, and the magnification ratio is set by moving the operating knob 72 to the scale position corresponding to the desired magnification ratio.

Further, another prior art continuously variable magnification setting device is shown in FIG. In FIG. 8, reference numeral 73 is an equal magnification selection switch, 74 and 75 are rotary knobs for setting magnification, rotary knob 74 is for coarse adjustment, and rotary knob 75 is for fine adjustment. Further, 76 is a display unit that displays the magnification. To set the magnification ratio, if the magnification ratio is equal to the same magnification, the equal magnification selection switch 73 may be pressed. If the magnification ratio is not equal to the same magnification, set the desired magnification by rotating the rotary knobs 74 and 75 while viewing the display section 76.

■ In the first prior art described above, the user must calculate the magnification ratio in advance and input the numerical value.

In the second prior art, as in the first prior art, the user has to calculate the magnification ratio in advance, and in addition, multiple stages of the magnification ratio are set instead of providing multiple stages of finely tuned magnification ratios. do. In order to do this, an element with a large storage capacity is required, which complicates the circuit configuration.

Furthermore, in the first and second prior art techniques, the magnification ratio is entered as a numerical value, so the user cannot intuitively recognize the magnification ratio.

Further, in the third prior art, it is not possible to make the magnification scale scale fine, and even if the scale is made fine, it is difficult to set and read the magnification scale accurately.

Further, in the fourth prior art, although it is easy to set the same magnification, when changing the magnification other than the same magnification, it is necessary to set it using the rotary operation knob 74, 75, which is inconvenient and difficult to operate. inferior in sex.

In addition, these first to fourth prior art techniques are configured to set the magnification ratio according to the document, so even if the document image is biased to one side of the document, the magnification can be set uniformly. Since copying is performed at a set magnification ratio, in extreme cases, a portion of the original image copied onto the copy paper may protrude from the copy paper.

It is an object of the present invention to solve the above-mentioned technical problems, and to: ・There is no need to calculate the magnification ratio in advance when changing the magnification operation, and the magnification ratio can be recognized intuitively with a simple operation; To provide a copying magnification setting device which prevents a part of a copied original image from protruding from copying paper.

In order to copy the amount, the present invention allows you to copy the original before copying. 3! In a copy magnification setting device that sets the copy magnification of a document placed on a placement plate and drives a magnification operating mechanism according to this magnification, the document f2 is set from the leading edge side to the rear edge side of the document placed on the placement plate. an optical scanning means that scans the original image of the original by moving toward the original; a fixed piece fixedly provided at a position corresponding to the leading edge of the original; a first operation piece that is displaceable in a direction parallel to the direction of movement of the means and that specifies the rear end of the original image of the original; and a first operation piece that is disposed on at least one side of the original and moves the optical scanning means by manual operation. a second operation piece that is displaceable in a direction parallel to the direction of the image and specifies the size of the original image after copying; The first to detect the position of
a position detecting means, a second position detecting means provided in the optical scanning means and detecting the position of the second operation piece by movement of the optical scanning means, and based on the detection results from the first and second position detecting means. , find the length X from the leading edge of the document to the first operating piece, find the length Y from the leading edge of the original to the second operating piece, set Y/X as the copy magnification, and set the copy magnification Y/ The present invention is characterized by comprising a magnification control means for driving the magnification operation mechanism in accordance with X.

According to the above configuration, when setting the copy magnification, the first operation piece is manually positioned at the rear end position of the original image.

Then, the second operation piece is positioned at a position corresponding to the desired size of the original image after copying. When the optical scanning means moves in such a state, the first detection means detects the positions of the fixed piece and the first operation piece, and the second position detection means detects the position of the second operation piece. The detection signals from these first and second position detection means are given to the magnification control means, and the magnification control means thereby detects the distance X1 from the leading edge position of the document to the first operation piece and the distance
Find the distance Y to the operation piece, calculate Y/X, and calculate this Y
/X is set as the copy magnification. And this copy magnification Y/
The copying mechanism is driven in accordance with X.

FIG. 1 is a simplified diagram showing the internal structure of an embodiment of a copying machine equipped with a copying magnification setting device according to the present invention. This copying machine 1 is a two-color copying machine, and its schematic configuration will be described below along with a standard copying operation for reproducing original images in their original form.

First, while the photoreceptor drum 2 is rotating in the direction of arrow a, a certain electric charge is applied to the surface of the photoreceptor drum 2 due to discharge from the charger 3.

Next, the scanner 6 having the exposure lamp 5 of the optical system 4 scans in the direction of the arrow, and irradiates light onto the document placed on the document platen glass 7, and the reflected light is reflected by the mirror, the variable magnification lens 20, etc. The surface of the photoreceptor drum 2 is exposed from the exposure point W through the optical system, and an electrostatic latent image corresponding to the original image is formed.

This electrostatic latent image is supplied with toner and visualized in the developing area E or E', which is a portion facing the first developing device 8 or the second developing device 9, and a toner image that reproduces the original image is formed. is formed.

On the other hand, the copy paper is selectively supplied from the paper feed section 10 or 11, and the timing roller pair 12 aligns the copy paper with the toner image on the photoreceptor drum 2 at a portion facing the transfer charger 13 (transfer area F). ), where the toner image is transferred onto the copy paper, and then conveyed between the pair of fixing rollers 15 by a conveyor bell 1-14, where the toner image is fused and fixed onto the copy paper, and the paper is ejected. It is discharged to section 16.

However, if the double-sided copy mode is selected, the copy paper is conveyed to the duplex device 17, reversed there, and conveyed again to the transfer area F, while the optical system 4
Then, as the photosensitive drum 2 rotates, a second copying operation is performed in the same manner as described above, and this time an image is formed on the back surface.

The cleaning device W18 scrapes off the residual toner on the surface of the photoreceptor drum 2, and further, the residual charge is erased by light irradiation from the eraser lamp 19, in preparation for the next development.

FIG. 2 is a plan view of the copying machine 1, and FIG. 3 is a plan view of the scanner 6.
It is an enlarged sectional view of the vicinity. Referring also to FIG. 1, a transparent glass 7 is provided on the upper surface 1a of the body of the copying machine 1, and a transparent glass 7 is provided below the glass 7 in FIG. Extending guide grooves 26,27 are provided.

The guide grooves 26, 27 extend from one end (the right end in FIG. 2) of the glass plate 7 to the other end (the left end in FIG. 2). A first operating piece 28 is provided in the guide groove 26 so as to be movable along the guide groove 26 . This first operation piece 28 is used to specify the rear end position of the document image of the document S. Further, a second operating piece 29 is provided in the guide groove 27 so as to be movable along the guide groove 27 . This second
The operation piece 29 is used to set the size of the original image after copying, as will be described later.

Further, an operation panel 30 is provided on the front side of the upper surface 1a of the body (lower side in FIG. 2). control panel 3
0 is equipped with a print switch SW1, a variable magnification mode setting switch SW2, and a display section 31 that displays the number of copies and variable magnification.

Furthermore, a fixing piece 32 is provided at a position corresponding to the leading edge of the document in the guide groove 26, which protrudes into the interior of the machine.

Permanent magnets 32a and 29a are provided at the lower ends of the fixed piece 32 and the first and second operation pieces 28 and 29, respectively.

28a is fixed. These permanent magnets 32a, 2
In relation to 9a and 28a, the scanner 6 is equipped with a first reed switch SW3 as a first position detection means and a second reed switch SW4 as a second position detection means. The reed switch SW3 and the reed switch SW4 are arranged in parallel on the upper surface of the scanner 6 in a direction perpendicular to the movement direction. The first reed switch SW3 is used to detect the positions of the fixed piece 32 and the first operating piece 28 by detecting the permanent magnets 32a and 28a. Also, the 21st
The J-de switch SW4 is used to detect the position of the second operation piece 29 by detecting the permanent magnet 29a.

Furthermore, a magnet H3 is provided for detecting the home position of the scanner 6.

The scanner 6 includes a driving boo IJ 42 and a driven pulley 4.
It is connected to an endless wire 43 that is wound around 1 and 1. This driving pulley 42 is driven by a scanning motor M1. Note that an encoder 44 is attached to this motor Ml.

FIG. 4 is a block diagram showing the electrical configuration related to the variable magnification operation. Print switch SWI and variable power switch S
The operation signal from W2 is sent to a microcomputer (hereinafter referred to as
50 (referred to as CPU). Further, each detection signal from the first reed switch SW3 and the second reed switch SW4 is given to the CPU 50. Furthermore, encoder 4
A pulse signal output from motor M1 according to the rotation angle of motor M1 is given to CPU50. Connected to this CPU 50 are a one-time memory (hereinafter referred to as ROM) 51 in which a system program is stored, and a random access memory (hereinafter referred to as RAM) 52 that stores variables such as data calculated by the CPU 50. . The CPU 50 also has a counter 5 which performs a counting operation by inputting a pulse signal from the encoder 44.
3 is provided. Further, the CPU 50 is connected to the driving motor 2 of the variable magnification lens 20 and the scanning M1, and the CPU SO controls the driving of the motors M1 and M2 according to the calculated variable magnification ratio as described later.

FIG. 5 is a timing chart when setting the variable magnification ratio. The magnification setting operation will be explained with reference to FIG. 5. First, as shown in FIG.
Place it so that it matches the tip of the Next, as shown in FIG. 5(1), the variable power switch SW2 is turned on at time tl.

This sets the zoom mode. In this state, the first operation piece 28 is positioned at the rear end position of the original image, and then the second operation piece 29 is positioned at a position corresponding to the size after copying. After specifying the magnification ratio using the first and second operating pieces 28 and 29, at time t2, the
), turn on the print switch SWI. As a result, at this time t2, the scanning motor M
1 is driven in normal rotation as shown in FIG. 5(3). At this time, the copying mechanism such as the photoreceptor drum 2 stops, and the scanner 6
A pre-scan state is entered in which only the 1st part is driven. When the scanning motor M1 is driven at time t2, the pulley 42 is rotationally driven in the direction of arrow a, and the scanner 6 is thereby moved from the home position in the direction of arrow a. Incidentally, due to the rotation of the motor M1, the time tl is changed as shown in FIG. 5 (4).
Thereafter, a pulse signal is output from the encoder 44, and the counter 53 starts a counting operation.

Then, when the scanner 6 reaches the leading edge of the document,
The first U-do switch SW3 detects the permanent magnet 32a and outputs a pulse detection signal at time t3 as shown in FIG. 5(5). At this time, the CPU 50 at this time t
Read the count value A of the counter 53 at RA
Store in M52.

In addition, in FIG. 5 (5), the reference numeral 1 indicates the permanent magnet 32.
The detection output is based on a, and the reference numeral 2 indicates the permanent magnet H3.
3 is the detection output based on the permanent magnet 28a.
This is the detection output based on .

Furthermore, when the scanner 6 moves and reaches the second operation piece 29 at time t4, the second reed switch SW4 detects the permanent magnet 29a, and thereby detects the permanent magnet 29a at time t4 as shown in FIG. 5(6). A pulse signal is output. At this time, the CPU 50 reads the count value B of the counter 53 at time t4 and stores it in the RAM 52.

Furthermore, when the scanner 6 moves and reaches the first operation piece 28 at time L5, the first reed switch SW3 detects the permanent magnet 28a as shown in FIG. 5 (5) and outputs a detection pulse signal to the CPU 50. do. At this time, CPU5
0 reads the count value C of the counter 53 at time t5 and stores it in the RAM 52. Then, the CPU 50 reads constants A, B, and C stored in the RAM 52,
The number of pulses Nl (=B-A) in the period from the permanent magnet 32a to the detection of the permanent magnet 29a is calculated, and the number of pulses N2 (=C-A) is calculated in the period from the permanent magnet 32a to the detection of the permanent magnet 28a. ) is calculated.

Then, Nl/N2 is determined, and this Nl/N2 is set as the magnification ratio. This N 1 /N 2 corresponds to Y/X.

The motor M1 is activated when the third pulse signal of the detection pulse signals from the first reed switch SW3 and the second reed switch SW4 is input (in this example, the second detection pulse of the first reed switch (when a signal is input), the scanning motor M1 is rotated in the reverse direction. Therefore, the pulley 42 is rotationally driven in the direction opposite to the arrow a, and therefore the scan 6
is returned in the opposite direction to the arrow. Then, when the scanner 6 reaches the home position at time t6, the rotation of the motor M1 is stopped. Note that the speed of the scanner 6 during the return period from time t5 to time t6 is much larger than the speed during the scan period from time t2 to time t5.

In this way, the copy magnification is set during the preliminary scan period.

Next, after the preliminary scan period and before the main scan period, the CPU 50 drives the variable power lens motor M2 to displace the variable power lens by a predetermined amount in the scanning direction (movement direction).
For example, during reduction, the variable magnification lens 20 moves to the position indicated by the imaginary line 20a in FIG. It moves to the position indicated by the imaginary line 20b in FIG.

Next, when the print switch SWI is operated at time t7, the copying mechanism such as the photosensitive drum 2 is driven, and
After a delay of a predetermined time T, the paper that had come before the timing roller 12 during the preliminary scan is moved to the timing roller 1.
2 toward the transfer area F. This T is a delay timer for aligning the leading edge of the image on the photosensitive drum 2 with the leading edge of the paper, and is realized by the software of the CPU 50. Furthermore, the scanning motor M1 is driven in the normal rotation direction. This causes the scanner 6 to move along the moving direction, thereby scanning the original image of the original S.
The process immediately returns when the reed switch SW3 detects the permanent magnet 28a. It should be noted that the moving speed of the scanner 6 at this time is higher than the speed when reducing the image at the same magnification, and smaller than the speed when the image is enlarged at the same magnification. Specifically, when the circumferential speed of the photoreceptor drum is V, , the moving speed of the scanner 6 is v/(Y/X), that is, the movement of the variable magnification lens 20 is a reduction in the main scanning direction of the original image, and the scanning speed is in the direction perpendicular to the scanning direction, that is, This relates to scaling in the sub-scanning direction.

When the first and second operation pieces 28 and 29 are set in the state shown in FIG. 2 in this way, the original image of the document S shown in FIG. 6 (1) is reduced as shown in FIG. 6 (2). and copied.

When the number of copies is only one, the copying process ends when the first reed switch reaches the home position again (t9). Further, when the number of copies is two or more, the steps from t7 to t9 are repeated for the set number of copies as shown in FIG.

In addition, in the variable magnification setting device according to the present invention, if Y/X exceeds the allowable variable magnification range during enlargement due to the settings of the first and second operation pieces 28 and 29, the variable magnification setting device Similarly, if the variable magnification ratio Y/X is smaller than the allowable range of variable magnification of the machine, the variable magnification ratio is set to the minimum value of the allowable range of variable magnification. ing.

In the above-mentioned embodiment, what happens when the magnification is changed in both the main scanning direction and the sub-scanning direction? Although the explanation has been given above, the present invention can also be applied to the case of analog magnification in which magnification is changed only in the main scanning direction and not in the sub-scanning direction. In this case, the variable magnification lens 20 is fixed and the scanner 6
Only the scanning speed of is changed.

In the above embodiments, a permanent magnet and a reed switch were used to specify the magnification ratio, but a mechanical switch such as a limit switch may also be used.
Alternatively, an optical switch including a light emitting element and a light receiving element may be used.

Furthermore, in the above-mentioned embodiment, after operating the variable magnification switch to set the variable magnification mode, the first and second operation pieces are operated to set the variable magnification ratio, and then the print switch is turned on to perform preliminary scanning. However, by first operating the first and second operation pieces and then turning on the variable magnification switch, a preliminary scan is started, and after the preliminary scan is completed, the print switch is pressed to perform the main scan. It may be configured like this.

Furthermore, although the above-described embodiments have been described with respect to an exposure slit type copying machine, the present invention can also be applied to a type of copying machine that reads images using a line image sensor such as a CCD and drives a laser optical system. In this case, it is possible to read the magnification ratio at the same time as reading the original image without performing a preliminary operation, and control the light emission drive of the laser in accordance with this magnification ratio.

As described above, according to the present invention, the copy magnification can be specified by operating the first and second operation pieces, and there is no need to calculate the magnification in advance as in the prior art, making it easy to use. Settings can be made with simple operations.

Furthermore, the magnification ratio can be visually recognized, which greatly improves usability. In addition, since the magnification ratio is set according to the original image rather than the original paper size, even if the original image appears unevenly on the original, it is possible to prevent parts of the copied original image from being missing. I can escape.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram showing the internal structure of an embodiment of a copying machine using a variable magnification device according to the present invention, FIG. 2 is a plan view of the copying machine 1, and FIG. 3 is an enlarged view of the vicinity of the scanner 6. 4 is a block diagram showing an electrical configuration related to the scaling process, FIG. 5 is a timing chart for explaining the scaling operation, and FIG. 6 is a diagram showing the state of scaling the original image. 7 and 8 are plan views of the prior art. 1... Copy machine, 6... Scanner, 7... Glass,
20... Variable magnification lens, 26.27... Guide groove, 28
...First operating piece, 29...Second wet cropping piece, 28a, 2
9a, 32a... Permanent magnet, 44... Encoder,
50...CPU, 51...ROM, 52...RA
M, 53... Counter, SWI... Print switch, SW2... Variable power switch, SW3... 117th
-Doswitch, SW4...217th-Doswitch, M
l...Motor for scanning, M2...Motor for variable magnification lens. Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] (1) In a copying magnification setting device that sets the copying magnification of a document placed on a document placement plate prior to copying and drives a magnification operating mechanism according to this magnification, the document placement plate an optical scanning device that scans the original image of the original by moving from the leading edge of the original to the trailing edge; a fixing piece fixedly provided at a position corresponding to the leading edge of the original; and at least one side of the original. a first operation piece disposed on the document, displaceable in a direction parallel to the moving direction of the optical scanning means by manual operation, and for specifying a rear end of the document image of the document; and a first operation piece disposed on at least one side of the document; , a second operating piece that is displaceable in a direction parallel to the moving direction of the optical scanning means by manual operation and that specifies the size of the original image after copying; a first position detection means that detects the positions of the fixed piece and the first operation piece by movement; and a second position detection means, which is provided in the optical scanning means and detects the position of the second operation piece by movement of the optical scanning means. and the detection results from the first and second position detection means, determine the length X from the leading edge of the document to the first operating piece, and determine the length Y from the leading edge of the original to the second operating piece. , further comprising a magnification control means for setting Y/X as a copy magnification and driving the magnification operating mechanism according to the copy magnification Y/X.