JPH0154702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image magnification conversion device for image formation.

2. Description of the Related Art In recent years, many image forming apparatuses such as copying machines that are capable of enlarging and reducing images have been commercially available. However, many users of image forming devices such as copiers with variable image magnification often form images that are the same size as the original (hereinafter referred to as "same size"), and the enlarged area of the original is reduced. It is common that image formation (hereinafter referred to as variable magnification) is relatively rare. However, in conventional image forming apparatuses, after image formation is completed at a non-standard magnification, or if the apparatus is left unattended with the non-standard magnification set, it is often the case that the user forgets to set the magnification and the standard magnification is changed. Although the image was intended to be formed, an image with a non-standard magnification is formed, resulting in many copy mistakes, which poses problems in terms of time and cost.

An object of the present invention is to provide an image magnification conversion device that eliminates the above-mentioned drawbacks.

That is, in an apparatus capable of forming images at standard magnifications and non-standard magnifications using magnification conversion means, a start key 41 for inputting a command to start image formation and one of the standard magnifications and non-standard magnifications are selected. magnification selection input means PB1, PB2 for inputting a selection signal to be selected, and a first pulse signal generation means K3 for generating a first pulse signal when a non-standard magnification is selected and inputted by the magnification selection input means;
Display means L1 and L2 display the magnification input by the magnification selection input means; second pulse signal generation means K1 generate a second pulse signal after image formation; and the magnification input by the magnification selection input means. storage means K2 that holds the selected selection signal and whose holding state changes according to input of another selection signal;
A common timed operation is started in response to a first pulse signal from the first pulse signal generating means based on a selection input of a non-standard magnification and a second pulse signal after the completion of image formation from the second pulse signal generating means. During the timed operation of the timer means C1, R2, R3, Q1, R5 and the timer means, when there is no input of the start key or selection input of a non-standard magnification by the magnification selection input means, the time-up signal of the timer causes the above-mentioned automatic switching means Q4 for setting the storage means in a storage state of the standard magnification and switching the display means to a display corresponding to the standard magnification according to the storage state of the standard magnification in the storage means; and after the image formation is completed and by the magnification selection input means. When the start key is input after the selection of a non-standard magnification is input and before the time-up of the timer means is input, the automatic switching operation by the time-up signal of the timer means is prohibited in response to the input, and the magnification selection output means Means K for forming an image at a non-standard magnification selected by
1-2, when a selection input of a non-standard magnification is made by the magnification selection input means after the completion of image formation and after the selection input of a non-standard magnification by the magnification selection input means and before the time-up of the timer means, An object of the present invention is to provide an image magnification converting device having means K3-1 for restarting the operation of the timer means in response to a one-pulse signal.

As a result, the standard magnification is automatically set both after a predetermined time after image formation is completed and after a predetermined time after inputting the non-standard magnification selection, so the previous operator can select the non-standard magnification and image Even if the image is formed or left as is without image formation, the inconvenience of the next operator accidentally copying at a non-standard magnification can be reduced, and the operator's input operations can be further simplified.

Furthermore, since a common timer is used for timed operations after image formation is completed and after input of non-standard magnification selection,
Compared to the case where separate timers are provided for performing timed operations at each time point, operations can be simplified with a simpler configuration.

Furthermore, if a non-standard magnification is selected during the timed operation of the common timer, the timed operation is restarted, so the timed operation can be extended even after image formation is completed or after the non-standard magnification selection is input. After the previous operator selects a non-standard magnification or forms an image at a non-standard magnification, the next operator selects a non-standard magnification and reverts to the standard magnification while setting the document. It can be prevented.

Further, when an image formation start command is input during timed operation, automatic selection of the standard magnification upon completion of the timed operation of the timer is prohibited, so it is possible to prevent the standard magnification from being selected during image formation.

An embodiment in which the present invention is applied to an electronic copying apparatus will be described below with reference to the drawings.

In FIG. 1, 1 is a document, 2 is a transparent document table, 6 and 7 are light sources for illuminating the document, 8 and 9 are reflecting mirrors for efficiently irradiating light from the light sources 6 and 7 onto the document 1, and 14 15 is a non-photosensitive portion on the photosensitive drum 14; 16 is a reference position of the photosensitive drum; 5, 11, 12, and 13 are for directing the reflected light from the original 1 along the optical path 24; , photosensitive drum 14
10 is a light source 6, 7 and a reflecting mirror 8,
9 and a reciprocating optical system including another reflecting mirror 5; 3 a sensor for detecting the home position (movement start position) of the optical system 10; 4 a sensor for detecting the inverted position of the optical system 10; 29 a diaphragm mechanism; 28 is a motor that rotates the photosensitive drum 14; 19 is a motor that moves the optical system 10 in the direction of arrow 25; and 20, 21, 22, and 23 are optical systems that move at different speeds. an optical system reversal and advancement clutch coupling a photosensitive drum motor 28 to the optical system 10 to move the optical system 10 in the direction of arrow 26;
17 selects one of clutches 19 to 23,
a drive mechanism that converts a predetermined rotation into optical system movement as indicated by arrows 25 and 26; 27 is a forward running portion of the optical system 10; 3;
A sensor 2 detects a predetermined portion 16 (hereinafter referred to as home position) of the photosensitive drum 14.

The process of forming an electrostatic latent image on the photosensitive drum 14 will be explained. First, a copy start signal is sent to the photosensitive drum 1.
4 starts rotating, and at the same time the electromagnetic clutch 19 operates, the optical system 10 returns to its home position, reaches the position of the sensor 3, and temporarily stops. Next, when the home position 16 of the photosensitive drum reaches the sensor 32, the surface of the photosensitive drum 14 is uniformly charged by a corona charger (not shown). When the photosensitive drum 14 rotates a predetermined angle and the charged surface reaches a position where the reflected image of the original 1 is incident, one of the electromagnetic clutches 20, 21, 22, and 23 operates, and the optical system 10 The camera moves in the direction of 26 and starts exposure scanning. Thereafter, exposure scanning is performed so that the reflected image of the leading edge 30 of the original 1 coincides with the position 31 on the photosensitive drum 14, and when the optical system 10 passes the leading edge position 30 of the original 1, the speed is stable and synchronized with the photosensitive drum 14. Exposure scan with . When the optical system 10 reaches the sensor 4 at the reversal position, it stops the exposure scan and reverses in the direction indicated by the arrow 26. The process then develops and transfers the formed electrostatic latent image onto an image support, such as paper fed from a cassette, and completes the copying after fixing.

Next, the case of variable size copying will be explained.

When copying in two sizes, ie, a size 34 equal to the original 33 and a size 35 1/n of the original 33 shown in FIG. 2, the scanning speed of the optical system 10 and the speed of the photosensitive drum 14 are equal in the same size copying However, in reduction copying such as 35, the scanning speed of the optical system 10 is
It needs to be faster than 4. Furthermore, the lens system 29 must be moved to the position 29' indicated by the broken line and zoomed out. Since these control methods are not the main point of the present invention, they will be omitted.

Next, switching between reduced copying and equal size copying will be explained in detail using the drawings. Fig. 3 is a top view of the operation panel of the electronic copying machine, Fig. 4 is a control circuit diagram of the copying machine, Fig. 5 is a circuit diagram of the lens driving part of the copying machine, and Fig. 6 is a signal waveform diagram of each part. are shown respectively.

PB1 is a push button switch for instructing full size copying,
PB2 is a push button switch for instructing reduced copying, 4
1 is a copy button, L1 is a 1x mode display lamp, L2 is a reduction mode display lamp, K1 is a relay that holds the copy signal SK1, K2 is a latching relay, and K1 and K2 are used to select the 1x mode instruction relay K4 or reduction mode. Select instruction relay K5. MS1 and MS2 are the micro switches shown in Figure 1, M is the lens system drive motor, and EC
1 is the terminal voltage of capacitor C1, ER5 is resistance R
5 terminal voltage, SK2 is the pulse input signal to the coil S of the relay K2, SK4 is the terminal voltage of the relay K4.
SK5 indicates a pulse input signal to the relay K5, and SK5 indicates a pulse input signal to the relay K5, respectively.

When the switch PB1 is pressed, voltage is applied to the coil S of the latching relay K2, and the contact K2-1 is connected to the a side. (Even if K2 is no longer energized, it remains in this state because it is a latching relay.) As a result, the lamp L1 lights up to notify the user. At the same time, the relay K4 is turned on, the motor M rotates to the right, the lens system 29 moves to the right, and the micro switch MS1 is pressed to stop the motor M and return to the same magnification position. Further, by a control circuit (not shown), the optical system drive device 17 selects the forward drive clutch for the same size reproduction, and preparation for the same size copying is completed.

When the reduction switch PB2 is pressed, voltage is applied to the coil R of the relay K2, which causes the contact K2 to close.
-1 is connected to the b side, the reduction display lamp L2 lights up and the relay K5 is turned on, the motor M rotates to the left, the lens system 29 moves to the left and comes to the reduction position shown by the broken line 29', and the micro switch MS2 is turned on. Press to stop. Further, a control circuit (not shown) causes the optical system drive device 17 to select the forward drive clutch for reduction, and preparation for reduction copying is completed.

The following describes the operation when the reduction instruction switch PB2 is pressed and then the copy button 41 is pressed. Press the switch PB2 at time T ₀ in FIG. 6 and at time T ₁
When the copy button 41 is pressed, copying starts in the reduction mode, the copy signal SK1 goes to the "1" level, the relay K1 is turned on and the contact K1-1 is opened, so even if the switch PB1 is pressed, the relay K2 does not operate. This creates a so-called switching prohibited state. Another contact K1-2 related to relay K1 is closed, so capacitor C1 is not filled. time
When copying ends at T ₂ , copy signal SK1 becomes “0”
level, the relay K1 is turned off, the contact K1-1 is closed, the inhibited state is released, and switching becomes possible. At the same time, the contact K1-2 is opened and the capacitor C1 is connected via the resistors R2 and R3.
Charging starts. The charging circuit consisting of resistors R2, R3 and capacitor C1 is a unijunction transistor (hereinafter referred to as UJT) Q1.
If the open circuit voltage ratio of UJTQ1 is Y, the voltage of capacitor C1 is 24×Y.
When it becomes [V], that is, at time T ₃ , UJTQ1
The resistance between the base and emitter becomes low, and the charge of the capacitor C1 is discharged through the resistor R5, and a voltage is generated across the resistor R5. This is a well-known oscillator circuit,
The oscillation period of this oscillation circuit can be adjusted by variable resistor R2, but here it is selected to be about 30 seconds to 60 seconds. The oscillation output of this oscillation circuit is a voltage applied to resistor R5, and this output is amplified by transistors Q2 and Q4 and input to coil S of relay K2. In other words, the coil S of relay K2 is at the end time of copying.
It is excited at time T ₃ , which is 30 to 60 seconds after T ₂ ,
Switch the contact K2-1 to the a side to set the mode to 1x. However, if the copy button 41 is pressed again between time _T2 and time _T3 , copying will be performed in the reduced mode. After switching to the same size, when the switch PB2 is pressed at time _T4 , the relay K3 is turned on.
As a result, the contact K3-1 closes only when the switch PB2 is pressed, discharging the capacitor C1, and pressing the copy button 41 at time _T5 while remaining in the reduction mode.
Press to get a reduced copy.

Next, after switching to 1x mode, press the switch.
If the copy button 41 is not pressed during the time interval of 30 seconds to 60 seconds after pressing PB2 at time T ₆ ,
The oscillation circuit again causes oscillation at time _T7 , and the coil S of relay K2 passes through transistors Q2 and Q4.
is excited, contact K2-1 is connected to the a side, and the mode becomes the same magnification mode. Also, if switch PB2 is pressed between time T ₆ and time T ₇ , relay K3 is turned on.
This closes contact K3-1 and capacitor C
After discharging 1, start charging again. Similarly, if the switch PB2 is pressed between the time _T2 and the time _T3 , the capacitor C1 is discharged and then charging is started again.

Here, the operation immediately after the power switch is turned on will be described.
Immediately after turning on, it is unclear whether the contact K2-1 of the relay K2 is on the a side or the b side.

Therefore, using a time constant circuit including resistors R9 and R10 and capacitor C2, transistor Q3 is operated immediately after power is turned on, and a pulse having a certain width is applied to coil S of relay K2 to set the equal-magnification mode. Immediately after the power is turned on, the charge on the capacitor C2 is 0, so it is charged by the resistors R9 and R10. Until this charging is completed, transistor Q3 operates and R
Transistor Q4 is activated via 7. The collector current of transistor Q4 is the coil S of relay K2.
flows. As a result, contact K2-1 is connected to the a side, relay K4 is turned on, and the state of copying at the same size is established.
Note that the magnification may be set to the same magnification after a certain period of time after the power is turned on.

In addition, in this electronic copying apparatus, it is also possible to change the size of the recording paper between normal size and reduction. Therefore, it is possible to return to the original size and also to return the recording paper to the original size. In this control, the signal SK4 operates the paper feed roller of the cassette containing the same size paper, and the signal SK5 operates the paper feed roller of the cassette containing the reduced size paper.

As explained above, according to the present invention, after forming an image in the variable magnification mode of reduction or enlargement in an image magnification conversion device such as a copying machine, or after selecting the variable magnification mode, within a certain period of time, If you do not instruct image formation, or after turning on the power, you can automatically return to the state where image formation is performed at the same magnification or the magnification normally used by the user, without the need to instruct the magnification. The user only needs to perform the magnification instruction operation when forming an image at a magnification that is not normally used. Therefore, the device according to the present invention does not cause copy errors even if the user forgets to specify the magnification, and is extremely practical in terms of cost and time.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an electronic copying machine to which the present invention is applied, FIG. 2 is a diagram showing original size and copy size,
FIG. 3 is a top view of the operation panel of the copying machine, FIG. 4 is a control circuit diagram of the present invention, FIG. 5 is a circuit diagram of a lens system driving section, and FIG. 6 is a signal waveform diagram of each part. 17 is an optical system drive device, 29 is a lens system, PB
Reference numeral 1 indicates a full-size copying pushbutton switch, PB2 a reduction copying pushbutton switch, L1 an equal-magnification mode display lamp, L2 a reduction mode display lamp, and M a lens system drive motor.

Claims (1)

[Claims] 1. In an apparatus capable of forming images at standard magnification and non-standard magnification by means of magnification conversion means, a start key for inputting a command to start image formation; a magnification selection input means for inputting a selection signal to select one; a first pulse signal generation means for generating a first pulse signal when a non-standard magnification is selectively input by the magnification selection input means; a display means for displaying a magnification input by the magnification selection input means; and a second pulse signal for generating a second pulse signal after image formation is completed.
pulse signal generation means; storage means for holding the selection signal inputted by the magnification selection input means and whose holding state changes according to input of another selection signal; a timer means for starting a common timed operation in response to a first pulse signal in response to a magnification selection input and a second pulse signal from the second pulse signal generation means after the completion of image formation; and during the timed operation of the timer means. , when there is no input of the start key or selection input of a non-standard magnification by the magnification selection input means, the time-up signal of the timer causes the storage means to enter the standard magnification storage state, and the storage means stores the standard magnification. automatic switching means for switching the display means to a display corresponding to the standard magnification, and an input of the start key after the completion of image formation and after the selection of the non-standard magnification by the magnification selection input means and before the time-up of the timer means; means for inhibiting the automatic switching operation based on the time-up signal of the timer means in response to the input when the temperature rises, and forming an image at a non-standard magnification selected by the magnification selection output means; When a selection input of a non-standard magnification is made by the magnification selection input means after the selection input of the non-standard magnification by the selection input means and before time-up of the timer means, the timer means operates in response to the first pulse signal. An image magnification conversion device comprising means for restarting.