JPS6134561A - Image magnification converter - Google Patents

Abstract

PURPOSE:To eliminate mis-copying, etc. when an operation for indicating magnification is neglected and to improve the practicability in terms of cost and time by returning a variable power mode to an unmagnification mode when there is no instruction for forming an image within the specified time after the selection of the variable power mode. CONSTITUTION:When the operator pushes a copy botton after pushing a reduction switch PB2, a copy signal attains a level 1 and a relay K1 turns on to open a contact K1-1 and therefore the change-over inhibition state in which a storage means relay K2 does not operate even if an unmagnification switch PB1 is pushed is attained. The copy signal attain a level 0 upon completion of the copying. Then the relay K1 turns off and inhibition state is released; at the same time, the contact K1-2 opens and a capacitor C1 is charged through resistors R2, R3 which are timer means. The charge of the C1 is discharged and a voltage is generated in a resistor R5 after the prescribed time when the voltage of the C1 attains a prescribed voltage. This voltage is inputted to the coil S of the storage means relay K2 after amplification Q2, Q4, by which the contact K2-1 is changed over to the side (a) and the unmagnification mode is set.

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 enlarge or reduce images have been put on the market. By the way, many users who use image forming devices such as copying machines 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 different from the one that can be reduced. Generally, image formation (hereinafter referred to as magnification changing) is relatively rare. However, in the conventional image forming apparatus, after the image forming in the variable magnification mode is completed, Goshiro forgets to specify the 64 magnification □ after turning on the power of the image forming apparatus, and intends to form an image at the same magnification. there were.

An object of the present invention is to provide an image magnification conversion device that eliminates the above-mentioned drawbacks. That is, after turning on the power of the image forming apparatus, an image is formed in variable magnification mode in the area after the image forming apparatus is turned on, and then an image is automatically formed in the same magnification area at the magnification normally used by the user, without the need for instructions to specify the magnification. It is an object of the present invention to provide an image magnification conversion device that can restore the original state.

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, and 6.
Reference numeral 7 indicates a light source for irradiating the original document l; 8 and 9 reflector mirrors for efficiently irradiating light from the light sources 6 and 7 onto the original document 1; 14 indicates a drum having a photoreceptor on its circumferential surface; 15 indicates a light source on the photoreceptor drum 14; 16 is a reference position of the photosensitive drum; 13 is a reflecting mirror that guides the reflected light from the original l along the optical path 24 to the photosensitive drum 14; 10 is a light source 6°7; Reflector 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 is a sensor that detects the inverted position of the optical system IO, 29 is a lens system with an aperture mechanism and variable magnification (zoom) II function, 28
19 is a motor that rotates the photosensitive drum 14; 19 is a motor that moves the optical system IO in the direction of arrow 25; and 20, 21, 2
2.23 moves the optical system 10 at different speeds with the arrows 26
An optical system reversing and advancing clutch 17 connects the photosensitive drum motor 28 to the optical system 10 in order to move the photosensitive drum motor 28 in the direction of the optical system 10, and selects one of the clutches 19 to 23 to rotate the photosensitive drum motor 28 in the direction indicated by arrows 25 and 26. Drive mechanism for converting optical system movement, 27
is the front part of optical system 10.

32 is a predetermined portion 16 of the photosensitive drum 14 (hereinafter referred to as ' There is a sensor that detects the home position (referred to as the home position).

The process of forming an electrostatic latent image on the photosensitive drum 14 will be explained. First, the photosensitive drum 14 starts rotating in response to a copy start signal, 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 through a predetermined angle and the charged surface reaches a position where the reflected image of the original 1 is incident, the electromagnetic clutches 20 and 21
,,22.

23 is operated, the optical system 10 moves in the direction of the arrow 26 and starts exposure scanning, and then the reflected image of the leading edge 30 of the original l matches the position 31 on the photosensitive drum 14.
During exposure scanning, when the optical system 10 passes the leading edge position 30 of the original 1, the exposure scanning is performed at a stable speed synchronized with the photosensitive drum 14. 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. Thereafter, the process is to develop the formed electrostatic latent image and transfer it onto an image support such as paper fed from a cassette, and after fixing, copying is completed.

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

When copying in two sizes, a size 34 equal to the original 33 and a size 35 equal to 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 1O needs to be faster than that of the photosensitive drum 14. Furthermore, lens system 29 is shown as a broken line! It must be moved to the position 29' shown 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 same size copying will be explained in detail with reference to 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.

PBl is a push-button switch for instructing full-size copying, PH1 is a push-button switch for instructing reduced-size copying, 41 is a copy button, Ll is a full-size mode display lamp, K2 is a reduction mode display lamp, and K1 holds a copy signal SKI. relay,
K2 is a latching relay, and Kl and 2 are equal in size.
Select 4 for the mode instruction relay or 5 for the reduced mode instruction relay. MS 1 and MS 2 are the microswitches shown in Figure 1, M is a lens system drive motor,
ECI is the terminal voltage of capacitor CI, ER5 is resistor R5
SR2 represents a pulse input signal to the coil S of the relay 2, SR4 represents a pulse input signal to the relay 4, and SR5 represents a pulse input signal to the relay 5.

When the switch FBI is pressed, voltage is applied to coil S of 2 in the latching relay, and contact 2-1 is connected to the a side. (Even if R2 is no longer energized, it maintains the state S because it is a latching relay.) As a result, the lamp L1 lights up to notify the user. At the same time, 4
is turned on, the motor M rotates clockwise, the lens system 29 moves to the right, and the microswitch MS1 is pressed to stop the motor M and return to the same magnification position. Further, a control circuit (not shown) causes the optical system drive device 17 to select the forward drive clutch for the same size copying, and preparation for the same size copying is completed.

When the reduction switch PB2 is pressed, a voltage is applied to the coil R of the relay '2, which connects the contact point 2-1 to the b side, turns on the reduction display lamp L2, turns on the relay 5, and turns on the motor M. rotates to the left, and the lens system 29 moves to the left until it reaches the reduction position indicated by a broken line 29', and stops by pressing the microswitch MS2. 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.

Press the reduction instruction switch FB2 and then copy button 41
This section describes the operation when you press .

The switch FB2 is pressed at time To in FIG. 6 and time T1
When the copy button 41 is pressed, copying starts in the reduction mode, the copy signal SKI goes to the "1" level, 1 turns on the relay, and the contact K1-1 opens, so the switch FBI
Even if I press , relay 2 does not operate. This creates a so-called switching prohibited state. Since the other contact K l -2 related to relay 1 is closed, capacitor C1 is not charged. When the copying is completed at time T2, the copy signal SKl goes to the ``0'' level, the relay 1 is turned off, the contact 1-1 is closed, and the inhibited state is canceled and switching becomes possible. At the same time, the contact K1-2 is opened and the resistor R2
And charging of capacitor CI is started via R3. The charging circuit composed of resistors R2 and R3 and capacitor CI is called a unijunction transistor (hereinafter referred to as UJ).
T) is connected to the emitter of Ql, and UJTQ
If the open circuit voltage ratio of I is Y, the voltage of capacitor C1 is 2
When it becomes 4XY(V), that is, at time T3, UJT
QI has a low resistance between the base and Φ emitter, 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 oscillation circuit, and the oscillation period of the 0 oscillation circuit can be adjusted by a variable resistor R2, but here it is selected to be about 301 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 2. That is, the coil S of the relay 2 is energized at time T3, which is 30 to 60 seconds after the copying end time T2, and the contact 2-1 is switched to the a side to set the copying mode to the same magnification mode. However, if the copy button 41' is pressed again between time T2 and time T3, copying will be performed in the reduction mode. Also, when the switch FB2 is pressed at time T4 after switching to the same size, 3 is turned on in the relay, and as a result, the 3-
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 to obtain a reduced copy.

Next, after switching to the same-size mode and pressing the switch PB2 at time T6, if the copy button 41 is not pressed during the time interval of 30 seconds to 60 seconds, the oscillation circuit starts oscillating again at time T7. Wake-up transistors Q2, Q4
Through this, the coil S of 2 is excited in the relay, and the contact point 2-1 is connected to the a side, and the mode becomes the same magnification mode.

Here, the operation immediately after the power switch is turned on will be described.

Immediately after turning on, it is unclear whether contact 2-1 in relay 2 is on the a side or the b side.

Therefore, using a time constant circuit consisting of resistors R9, RIO, and capacitor C2, transistor Q3 is operated immediately after the power is turned on, and a pulse having a certain width is applied to coil S of No. 2 to set the relay to the same magnification mode.

Immediately after the power is turned on, the capacitor C2 has a charge of O, so it is charged by the resistor R9 and RIO. Until this charging is completed, transistor Q3 operates, and transistor Q4 operates via R7. The collector current of transistor Q4 flows through two coils S of the relay. As a result, the contact point 2-1 is connected to the a side, and the relay 4 is turned on, resulting in a state of original size copying. 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 same size and also to return the recording paper to the same borrowed 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, in an image magnification conversion device such as a copying machine, the device can be reduced.

After forming an image in variable magnification mode, or after selecting variable magnification mode, if you do not instruct image formation within a certain period of time, or after turning on the power, there is no need to instruct magnification. It is possible to automatically return to the state of forming an image at the same magnification or the magnification that the user normally uses, and the user only needs to perform a magnification instruction operation when forming an image at a magnification that is not normally used. It is something. 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]

Figure 1 is a schematic sectional view of an electronic copying machine to which the present invention is applied;
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 the lens system drive section, and FIG. 6 is a diagram showing the original size and copy size. The figure is a signal waveform diagram of each part. 17 is an optical system drive device, 29 is a lens system, FBI is a 1x copy pushbutton switch, PB2 is a reduction copy pushbutton switch, Ll is a 1x mode indicator lamp, L2 is a reduction mode indicator lamp, M is a lens system drive motor are shown respectively. Engraving of the drawings (no changes to the contents) Procedural amendment form) 1. Display of the case 1989 Patent Application No. 189052 □2, Name of the invention Image magnification conversion device 3, Person making the amendment Relationship to the case Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100)
) Canon Co., Ltd. Representative Ryu Kaku Sanbe □4, Agent Address 3-30-25 Shimomaruko, Ota-ku, Tokyo 14111
, Date of amendment order April 30, 1985 (shipment date) 6. Drawing of the first specification subject to amendment, power of attorney 7, Contents of the amendment (1) Engraving and attachment of drawing 1 of the specification originally attached to the application (No change in content) (2) Supplement the power of attorney as shown in the attached document. ? Frame height 4g,

Claims (1)

[Claims] In an apparatus capable of forming images at different magnifications using a magnification conversion means, the apparatus includes a magnification selection input means, a display means for displaying a magnification input by the magnification selection input means, and a display means for displaying a magnification input by the magnification selection input means. means for storing, timer means that starts after a magnification other than a predetermined standard magnification is selected and input by the magnification selection input means, and means for controlling the storage means to store the standard magnification when the timer means times out. and means for switching the display of the display means to a display corresponding to a standard magnification using the storage means.