JPS6011831A - Copying magnification converter - Google Patents

Abstract

PURPOSE:To simplify the constitution by constituting a titled converter so that a variable power mechanism is displaced by movement of a driven wire, and executing scanning of an object and displacement of the variable power mechanism by a single driving motor. CONSTITUTION:A titled converter is provided with an equal-speed supporting member 20 for holding the first reflector 13, and a half-speed supporting member for holding lthe second reflector 15, which move at a speed ratio of 2:1 for each other, and a wire 26 is extended among a movable pulley 29 provided on both these members 20, 22, a driving pulley 25 provided on the body, and plural stationary pulleys 27, 28, 30, 32 and 34. Also, this converter is provided with a motor for driving the driving pulley 25, and a variable power mechanism for displacing the supporting members 20, 22 of an equal-speed and a half-speed in accordance with variable magnification. In this way, this converter is constituted so that the variable power mechanism is displaced by a movement of the driven wire 26 by fixing the half-speed supporting member 22 to a fixed position, and scanning of an object and displacement of the variable power mechanism are executed by a single driving motor.

Description

[Detailed description of the invention] Industrial applications The present invention relates to reduction from reduction to enlargement of a copying machine.

The present invention relates to a copying magnification conversion device that converts magnification.

Conventional structure and its problems Copying magnification conversion devices conventionally used in copying machines with a movable document table or a fixed document table type include a constant-velocity mirror that moves at a speed ratio of 2:1 and a semi-uniform mirror that moves at a speed ratio of 2:1. This can be done by changing the positional relationship with the fast reflector and moving the lens position back and forth accordingly, or by placing multiple lenses in the device body in advance and replacing them. The reason for doing this is to maintain the optical positional relationship between the distance a between the lens and the subject and the distance between the lens and the image so that 1 1 1 bf is satisfied, and , so that the ratio of a and b becomes the desired reduction/enlargement magnification, and the movement of the reflecting mirror and the movement of the lens are usually moved by separate means such as cams. Therefore, the mechanism and configuration thereof have become extremely complicated, and drive motors and the like are also required to drive each component, which has been a factor in increasing costs. In addition, when using a cam mechanism to set the position of the reflector or lens according to the copying magnification, if the magnification is set too close to each other, it will be difficult to design the cam, making selection impossible. It could not be said that there was a high degree of freedom in setting the rate. Furthermore, the variable magnification mechanisms used in conventional copying machines are large in size.

This was an impediment to the miniaturization of copying machines.

Furthermore, in order to perform multiple stages of reduction and enlargement, several positions must be changed according to each magnification.

However, it is not easy to focus at any magnification with a single operation, and there are many drawbacks such as poor usability. It had

OBJECTS OF THE INVENTION The present invention aims to eliminate the drawbacks of the above-mentioned conventional examples, and it is an object of the present invention to change the magnification conversion from reduction to enlargement using a mechanism with a simple configuration in a copying machine with a fixed original, and to change the magnification. To provide a simple and low-cost copying magnification conversion device having a simple configuration in which a drive motor for performing optical scanning at the time of copying is also used for conversion without using the power of a special drive motor or the like.

Structure of the Invention In order to achieve the above object, the present invention provides a constant-velocity support member that holds a first reflecting mirror that moves at a speed ratio of 2:1 to each other, and a half-speed support member that holds a second reflecting mirror that moves at a speed ratio of 2:1. a wire stretched between a movable pulley provided on the constant velocity support member and the half speed support member, a drive pulley and a plurality of fixed pulleys provided on the main body, and a drive motor that drives the drive pulley; a variable magnification mechanism that displaces the constant velocity support member and the half speed support member according to a variable magnification ratio, and the variable magnification mechanism fixed to the wire is held at a constant position when scanning an object; When changing magnification, the half-speed support member is fixed at a fixed position, and the variable magnification mechanism is displaced by movement of a driven wire, so that scanning of the object and displacement of the variable magnification mechanism are performed by a single drive motor. This is how it was done.

Description of examples Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a projection diagram for explaining obtaining a reduced image. As shown in the figure, when a lens 1 with a focal length f is used, an image 3 of a subject 2 is such that the subject 2 is at the center of the lens 1. If it is located 2f away from 0, it will be formed at the same magnification at a position 2f away on the opposite side of the lens 1. If the subject 2 moves further away by a distance
It is reduced in size and formed at a position 2y closer to the lens side than the distant position. Now let h be the height of subject 2, and let mh be the height of the reduced image obtained when this subject is further separated by distance X. From Figure 1, (where m is the ratio of the subject to the image) ) can be obtained. Furthermore, by eliminating m and h from the above equations (1) and (2), the following equation is obtained.

Next, the principle of reduction and enlargement according to the present invention will be explained using FIG. 2. FIG. 2 is a diagram thereof, and the extended ends of the straight line 4 and the straight line 5 intersect at an angle θ. A straight line 7 is made to hang down from a point 6 on the first straight line 4, and the point of intersection with the second straight line 6 is set to 8. Let A be the distance between points 6 and 8, and set a fulcrum 9 at a distance equal to distance A on the extension of straight line 7 from point 8. And the first
Take a point 1° away from point 6 on straight line 4 by a distance
2 and the distance parallel to the first straight line 4 between this point 12 and the hanging straight line 7 is y, then the following formula % Formula % Transforming this formula (3), x ... (n), 2 A + : Obtain ic tan θ. This obtained formula (It) and the previously obtained (1)
If we compare the equations, we will see that the two equations obtained earlier match.

Note that when point 10 on the first straight line 4 is located to the right of point 6 in the figure, the mode is reduced, and when point 1o is located to the left of point 6, the mode is enlarged. mode.

As mentioned earlier, the position of point 6 is the same magnification mode.

Next, the arrangement relationship between the reflecting mirror and the lens according to the present invention will be explained. FIG. 3 is a diagram showing the arrangement and configuration of the first mirror 13.
Six mirrors and lenses are shown, from 1 to 18. The first reflecting mirror 13 is at an angle of 46° with respect to the surface of the subject 2 such as a document.
The second mirror 14 is parallel to the first mirror 13, and the third mirror 16 is integrally provided at an angle of 9CP, and is configured as a second reflecting mirror. The first reflecting mirror and the second reflecting mirror are configured to move at a speed ratio of 2:1. The optical axis of the lens 1 is parallel to the surface of the subject 2 (in this embodiment, the surface of the original to be copied). The fourth mirror 16 faces the third mirror 15 at right angles so as to bend the optical axis passing through this lens 1 at right angles, and 46
The sixth mirror 17 is integrally provided at an angle of 900° and is configured as a third reflecting mirror. Therefore, the light from the lens 1 is reflected back in the opposite direction.

The light projected and reflected in this way is transferred to the sixth mirror 18.
The image is further bent and projected onto the surface of the photoreceptor drum 19. In this embodiment, the lens 1 is fixed to the main body of the copying machine.

Here, if you want to reduce the image of subject 2, use the first
The third reflecting mirror 13 is moved a distance X to the position 13' in the direction of the lens 1 in FIG.
．． 17 at 16' and 17' positions by distance y from lens 1
move closer to the direction of If the amount of movement of X and y at this time is moved according to the relationship expressed by equation (1) described above, a state in focus can always be obtained.

The light passing through lens 1 is bent by the third reflecting mirror and returns to its original direction, so if the third reflecting mirror moves a distance of y, the image itself will approach the lens by 2y. ,
It is understood that this corresponds to the relationship shown in FIG.

For this reason, the present invention has the relationship of the above-mentioned formula (III) and has a mechanism that operates according to formula (n) to interlock the movement of the first reflecting mirror and the third reflecting mirror. It provides a calculation mechanism that always maintains focus according to the magnification.

Hereinafter, a specific embodiment of the present invention will be described in which a copying magnification conversion device is configured based on the above-mentioned principle.

Figures 4 and 5 are configuration diagrams of the optical system.
A configuration is shown in which the reflecting mirror and the second reflecting mirror are moved at a speed ratio of 2:1, and the first reflecting mirror and the third reflecting mirror are interlocked during zooming while always being in focus.

In FIG. 4, the first mirror 13 is attached to and held by a constant velocity support member 20, and is slidably held and guided by a first guide shaft 21.

The second mirror 14 and the third mirror 16 are attached to a half speed support member 22, and are slidably held and guided by a second guide shaft 23.

Further, the fourth mirror 16 and the fifth mirror 17 are also attached to the third support member 2.
4, and is slidably held and guided by the second guide shaft 23 mentioned above.The constant velocity support member 2o and the half velocity support member 22 are attached to the optical system drive member 2o. It is configured to be driven by a wire system with a speed ratio of 2:1.

A wire 26 wound several times around the drive pulley 25 of the optical system fixed to the main body is attached to a fixed boo IJ fixed to the main body.
27 and 28, it is wound 18o0 around a movable pulley 29 provided on the half-speed support member 22, changed direction by a fixed pulley 30, and sent to a terminal 31 provided on a slider of a variable power device, which will be described later. It is being Here, the terminal 31 is operated during normal copying operation, that is, when the constant velocity support member 20. Half speed support member 22
When the lens moves at a speed ratio of 2:1, it is held fixed at a fixed position, and when changing the magnification, it moves as described later.

The wire 26 that has come out of the terminal 31 is folded back by a fixed pulley 32, then folded back again by a movable pulley 33 provided coaxially with the movable pulley 29 provided on the half-speed support member 22, and then passed from the fixed pulley 34 to the fixed pulley 2. The drive pulley 25
is back.

One end 35 of the constant velocity support member 20 is fixed to a wire 26 stretched between a fixed pulley 28 and a movable pulley 29. Therefore, when the drive pulley 25 rotates in the clockwise direction indicated by the arrow G, the constant velocity support member 2o moves to the left, and at the same time, the half speed support member 22 also moves at half the speed.

When the optical exposure scan is completed, the drive pulley 25 rotates in the opposite direction, and each support member returns to its position before the start of the scan.

Note that 36 is a locking member that coaxially supports the movable pulleys 29 and 33 and is provided on the half-speed support member 22, such as a pin. Moreover, this pin may be provided at another location of the half-speed support member 22, which is limited to this embodiment.

Reference numeral 37 denotes a lever, which has an engaging portion 38 such as a notch formed at a position corresponding to the aforementioned pin 36, and is configured to swing up and down by a solenoid 39 connected to one end.

Next, the variable magnification mechanism that performs interlocking displacement of each support member during variable magnification will be explained with reference to FIG. 5. FIG. 6 shows that the relationship between X and y shown in FIG. 2 is a plan configuration diagram obtained by the relationship, in which a first guide portion 41 having two guide shafts 40, 40' forming a first straight line 4 is provided parallel to the optical axis of the lens 1. It is being This first guide member 41 has a first slider 4
2 is guided by a guide shaft and supported so that it can slide smoothly. Two guide shafts 43 constitute a second straight line that intersects the first straight line at a constant angle θ so as to satisfy the relationship of formula (Ill) with respect to the first guide member 41.
．． A second guide member 44 having a shaft 43' is provided, and a second slider 45 is similarly supported on the second guide member 44 so that it can be guided by the guide shaft and slid smoothly. has been done. The first slider 42 and the second slider 46 are provided with pins 46 and 47, respectively, and are formed into a lever 48 that uses the fulcrum 9 as a rotatable support and swings around this. It is configured to fit into and interlock with the long hole 48'.

Further, a third slider 49 is supported on the first guide member 41 so as to be guided by the guide shaft so as to slide smoothly, and a second slider 49 is provided in the elongated hole 49' formed at the other end. Child 4
A pin 47 provided on the lever 5 is fitted into the lever 48 so as to be interlocked with the swinging movement of the lever 48. Furthermore, the first slider 42
A pin 50 is embedded in the pin 50, which is fitted into a plurality of magnification setting holes 63 formed in a positioning plate 62 which is moved up and down in the vertical direction on the plane of the paper by a solenoid 51. The third slider 49 described above is provided with a terminal 64 as shown in the figure, and a wire 55 for variable magnification is attached to this terminal 54.

The wire 56 is folded back and wound around a pulley 57 via a fixed roller 56. The pulley 57 is always urged to rotate in the counterclockwise direction indicated by arrow M by a spring or the like. A portion 68 of the third support member 24 is fixed to the wire 65 between the fixed pulley 56 and the pulley 5.

In such a configuration, when the terminal 31 provided on the first slider 42 is driven by the wire 26, the first
The slider 42 also slides in the left-right direction accordingly. At this time, since the lever 48 also swings about the rotation support part 9, the second slider 45 and the third slider 49 also slide in conjunction with each other.

As a result, the terminal 31 of the first slider 42 is at the same position,
From the position where the tab lever 48 is vertical in FIG.
As shown in the figure, when moving a distance X to the right, the second slider 45 similarly moves on the second guide member 44 from point 8 to point 12.

At this time, the second slider 45 moves the third slider 49 guided by the first guide member 41.

Therefore, the third slider 49 moves by the distance y in the parallel direction to the first guide member 41 relative to the amount of movement from point 8 to point 12 of the second slider 45, and Terminal 5 of mover 49
4 will be moved to the right by the distance y calculated using equation (n) above. In other words, if the amount of movement of the terminal 31 is the amount of movement of the first mirror 13 shown in FIG. It is possible to change the reduction and enlargement ratio depending on the state.

Further, the second guide member 44 is provided with a rotatable support portion such as a pin 59, and an adjustment mechanism such as an elongated hole 60 and a locking screw 61 is provided at one end. lens 1
There is a slight variation in the focal length f of each lens, and there may be slight differences in position during assembly.
In order to always maintain focus against such fluctuations, the adjustment mechanism provided on the second guide member 44 is finely adjusted in the direction of arrow F to adjust the angle θ at which it intersects with the first guide member 41.
It is configured to be adjustable. The position of the rotatable support portion (pin 59) provided on the second guide member 44 is
A hanging straight line 7 from a point 6 of the first straight line 4 shown in the figure to the fulcrum 9 and a second straight line 5 forming the second guide portion side 44
It is provided at the intersection 8 with the

Furthermore, the operation of the embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 4, when the solenoid 39 is energized, the lever 37 is attracted. At the same time, the drive pulley 25 begins to rotate clockwise as indicated by arrow G.

The locking member 36 provided on the half-speed support member 22 moves slightly to the left, and the solenoid 39. The half-speed support member 22 is fitted into the engaging portion 38 of the lever 37 which is lifted upward by energization, thereby fixing the half-speed support member 22 at a fixed position.

At the same time as the solenoid 39 is energized, the solenoid 61 shown in FIG. 6 is also energized. The solenoid 51 is connected to a positioning plate 62 for setting variable magnification, and the suction action causes the positioning plate 52 to be lifted upwards (in the direction toward the front) in the drawing and fit into the pin 5o provided on the first slider 42. The connection is canceled. When the drive pulley 25 rotates in the direction of arrow G in this state, the terminal 3 fixed to the wire 26
1 moves to the right. Therefore, the first slider 42
moves to the right to a position corresponding to the desired magnification ratio, the second slider 46 is moved by the lever 48, and by the movement of this second slider 46, the third slider 46 is moved to the right.
The sliders 49 move in conjunction with each other. As the third slider 49 moves, its i-element 54 changes according to the above formula (
Move to the right by the distance calculated in step n) and touch wire 5.
5 is wound up by the pulley 57, the third support member 24 fixed to the wire 55 moves to the left, and the third reflecting mirror approaches the lens 1 side. Second, it is possible to set the magnification change so that the image is always in focus, as detailed in FIG.

Then, when it is detected by the output signals from the plurality of sensors 64, 65, and 66 arranged around the encoder disc 63 that the position corresponding to the set magnification ratio has been reached, the energization to the solenoid 51 is cut off. Insert the pin 5 into the specified hole 63.
0 is fitted, and the current to the solenoid 39 is also cut off.

Since the holding of the half-speed support member 22 is released and it becomes freely movable, the document surface is scanned as the drive pulley 25 rotates, and then the document surface is scanned as the drive pulley 25 rotates in reverse. position, that is, return to the original position at the start of scanning. This completes the preparation for variable size copying.

In the present invention, the half-speed support member 22 and the third support member 24 are further arranged on opposite sides of the lens 1 and are configured to be guided by the same second guide shaft 23. However, although the half-speed support member 22 moves to the position closest to the lens 1 when scanning a document, it is possible that it may cross the lens 1, and the third support member 24 also has a reduction magnification. It comes closest to lens 1 when it is the smallest, but it also does not cross over lens 1. Therefore, even if the same guide shaft is used for sliding, there will be no collision.

The lens 1 is fixed to a lens housing 62 as shown in Figure 8g4, and the sixth mirror 18 is also fixed to this lens housing 62 to form a lens housing unit.

Furthermore, an encoder disc 63 is attached to the rotation support part 9, which is the fulcrum of the lever 48, and rotates as the lever 48 swings. It is configured to give a signal. If these plurality of sensors are photosensors, the notches 63a, eab, 63 provided in the encoder disc 63
The solenoid 51 is turned on when it is turned on and turned off when it is shut off. Therefore, the magnification ratio is set using multiple sensors, and the power to the solenoid 51 is cut off when the predetermined magnification ratio is detected. The positioning plate 52 for variable magnification is placed at the bottom of the holder, and the hole 53 having a predetermined variable magnification ratio fits into the pin 5o of the first slider 42, thereby opening and closing the variable magnification mechanism.

The positioning plate 52 for variable magnification may be provided with a hole or a notch that can be used for a copying machine from reduction to equal magnification to enlargement. In this embodiment, a total of 8 holes are provided, including 5 stages of reduction, 2 stages of equal magnification, and 2 stages of enlargement. For example, reduce this by 4 steps and enlarge by 3 steps.

If you want to achieve the same number of magnification steps, you can easily achieve this by changing the position of the holes or the position of the positioning plate.

Further, although a method for driving the drive pulley 25 of the optical system is not shown, in the embodiment of the present invention, a DC motor equipped with a rotational speed detection means is used.

This means that a pulse is output from the rotation speed detection means according to the rotation speed of the motor, and this pulse is compared with a reference signal from a reference signal generator built into the main body to detect the rotation of the motor. If the number of rotations is slow, the motor is controlled to increase its rotational speed, and is controlled so that it always rotates at a constant rotational speed.

Further, a plurality of reference signals are prepared according to reduction and enlargement, and an appropriate reference signal is used in synchronization with selection of the magnification of the variable magnification mechanism.

Needless to say, when the optical system returns, a voltage in the opposite direction is applied to the motor, causing the motor to rotate in the reverse direction.

Further, in the embodiment of the present invention, the first reflecting mirror is moved,
Although a configuration has been described in which the third reflecting mirror is moved in conjunction with this according to the magnification ratio, the present invention is not limited to such an embodiment. It is also possible to move the second reflecting mirror to the left as shown in Fig. 3 while keeping it fixed; It is also possible to change the magnification by moving the mirrors to the left at the same time, but the key is to determine the distance between the first and second reflecting mirrors, and the distance between the lens and the third reflecting mirror. The present invention can be achieved by interlocking and displacing the distance between the two images by a distance corresponding to the magnification ratio.

Effects of the Invention As is clear from the above description, according to the present invention, the scanning of the document and the conversion of the variable magnification mechanism are performed by the same drive motor, so that the structure is simple.

Moreover, it is possible to obtain an inexpensive copying and leaf exchange device.

In addition, in the present invention, since the variable magnification mechanism can also be operated by the optical document scanning motor, the device itself can be made compact, and the optical scanning and variable magnification mechanisms move simultaneously, resulting in a phase shift in their positional relationship. A very reliable copying machine with a variable copying magnification function can be realized.

[Brief explanation of the drawing]

Fig. 1 is an optical projection diagram for explaining obtaining a reduced image, Fig. 2 is a diagram for explaining the principle of copying magnification conversion according to the present invention, and Fig. 3 is a lens in an embodiment of the present invention. FIG. 4 is a perspective view of a main part of an optical system in an embodiment of the present invention, and FIG. 6 is a plan view of a main part of a copying magnification conversion device according to an embodiment of the present invention. be. 1... Lens, 13... First reflecting mirror, 14116... Second reflecting mirror, 16.17.
...Third reflecting mirror, 2o... Constant velocity support member, 22... Half speed support member, 24... Third support member, 26... ...Drive pulley, 26...
...Wire, 2.7, 28, 30.32゜3
4... Fixed pulley, 29... Movable pulley, 36... Locking member, 37... Lever, 38... Engaging portion . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3?

Claims (3)

[Claims] (1) A constant-velocity support member holding a first reflecting mirror and a half-speed supporting member holding a second reflecting mirror that move at a speed ratio of 2:1 to each other, and the constant-velocity supporting member and the half-speed supporting member A wire stretched between a movable pulley provided on the support member and a drive pulley and a plurality of fixed pulleys provided on the main body, a drive motor that drives the drive pulley, and the constant velocity support member and the half speed support member. and a variable magnification mechanism that displaces the magnification according to the magnification ratio, and when scanning an object, the variable magnification mechanism fixed to the wire is held at a constant position, and when changing the magnification, the half-speed support member is held at a constant position. and the variable magnification mechanism is displaced by the movement of a driven wire, so that scanning of the object and displacement of the variable magnification mechanism are performed by a single drive motor. conversion device. (2) The half-speed support member is not fixed in a fixed position during zooming by engaging the locking member provided on the half-speed support member with an engaging portion formed on the lever. Copying magnification conversion device 0 according to claim (1) (3) A copying magnification conversion device according to claim (1), characterized in that the third supporting member holding the third reflecting mirror is displaced in accordance with the displacement of the variable magnification mechanism. .