KR870001096B1 - Duplicator with converting continuous magnification - Google Patents

Abstract

This invention describes a new photocopier which changes the multiple continuously. This photocopier consists of a wire electromotor which drives the first, the second, third supporters with velocity ratio of 1:0.5,a driving motor which drives the fourth and fifth supporters, and a conveyor which transfers the dynamic from the driving motor to the fourth and fifth supporters. In this machine, the mirrors move but the lenses don't by a driving motor. This process requires only one driving motor for cost reduction. This photocopier also claims good resolution by the unmoving leneses.

Description

Continuous Magnification Conversion Copying Machine

1 is a front view showing an optical system of the magnification-converting copying apparatus of the present invention.

2 is a schematic diagram of a link mechanism showing the principle of magnification conversion of the present invention.

3 is a view showing an embodiment of a continuous magnification converting copying apparatus of the present invention.

4 is a perspective view of a conventional magnification converting copying apparatus using a cam.

* Explanation of symbols for main parts of the drawings

4: first support member 7: second support member

13: third support

The present invention relates to a copier for continuously converting magnifications, comprising: a support of a first mirror moving in a direction parallel to the optical axis, a support of second and third mirrors moving in a direction parallel to the optical axis, The fourth and fifth mirror supports moving in parallel directions, the wire transmission mechanism for transmitting the first mirror support, the second and third mirror supports at a speed ratio of 1/2, and the fourth and fifth mirror supports. A drive motor for driving a five mirror support, a power mechanism for transmitting power of the shift drive motor to the supports of the fourth and fifth mirrors, the fourth and fifth mirror supports, and the second and third The present invention relates to a magnification converting copying apparatus capable of converting magnifications steplessly, characterized in that it comprises a mechanism for moving the mirror support together.

It is an object of the present invention to provide a new type of continuous magnification converting copying apparatus which converts magnification continuously by moving only a mirror without moving the lens with one driving source.

As a prior art of magnification conversion in a conventional copier,

1) How to move the lens and mirror to different servo motors.

2) Interlocking the mirror and the lens by interposing the cam with one servo motor.

3) There is a method to move the mirror and lens by using a link mechanism with a servo motor.

One example of a conversion mechanism of the magnification of a conventional copier is shown in FIG. That is, by using the cam 77 shown in the figure, the magnification is converted by interlocking the second and third mirror support claws 73 and the support 81 of the lens 74. The cam 77 is designed to have a displacement that becomes a corresponding magnification according to the displacements of the second and third mirror supports 73, so that when the variable displacement drive motor 84 rotates, it is fixed to the shaft 85. Pulley 86 and cam 77 rotate together. When the pulley 86 rotates, the pulley 75 slid by the wire rope 87 rotates to move the second and third mirror supports 73. At this time, the first mirror support 72 is stopped. have.

On the other hand, when the cam 77 rotates, the lens support 81 fixed to the cam slider 78 is displaced in the optical axis direction by the lens reciprocating guide members 82 and 83 to adjust the magnification.

The method of 1) of the above-described conventional methods has a disadvantage that the servo motor is expensive, and the methods of 2) and 3) apply excessive force to the lens mechanism that must maintain elaboration because the mechanism of the lens moves. There is a drawback that the resolution of the lens can be lowered, and in particular, the method of 2) above has a drawback that the production of the cam is difficult even if the cam processing error is tolerated.

SUMMARY OF THE INVENTION In view of these various problems, the present invention has been developed a new type of copying apparatus which continuously converts the magnification without permission by moving only the mirrors without moving the lens with one driving source.

인 관계를 주는 유동풀리와 함게 회전하는 두개의 풀리의 직경의 비가 π(D₂/D₁)이 풀리와 링크로 구성되어 있다.The present invention provides a continuous magnification copying apparatus, comprising: a first mirror support moving in parallel to an optical axis, a second and third mirror support moving in a direction parallel to the optical axis, and a first mirror support and a second and third mirror A wire transmission mechanism for moving the support at a speed ratio of 1/2; a drive motor for variable displacement for reciprocating the fourth and fifth mirror supports, the fourth and fifth mirror supports, and the second and And a transmission mechanism for shifting by interlocking with a third mirror support, and having a wire transmission mechanism for transmitting a driving force by binding the fourth and fifth mirror supports with the shift driving motor and wires as shown in FIG. There is a wire transmission mechanism, and when the displacement of the fourth and fifth mirror support is x, the displacement of the second and third mirror support is y, the fourth and fifth mirror support and the second and third mirror support are Y =

The ratio of the diameters of the two pulleys rotating together with the flow pulley giving the phosphorus relation is π (D ₂ / D ₁ ) consisting of the pulley and the link.

In the optical system described above, as shown in FIG. 1, the optical path length am and the lens 8 between the document 1 and the lens 8 having a focal length f for fitting a perfect image when the magnification is m and The length bm of the optical path between the surfaces of the drum 15 can be obtained from the formula relating to the image formation of the lens.

The formula for the imaging of the image of the lens is as follows.

In the above formula (2), bm is bm = m · am, and substituted by Eq. (1), am is given as follows.

By the way, as mentioned above, bm is m * am, and when substituting Formula (3) here, bm is as follows.

bm = mam = (1 + m) f .. (4)

On the other hand, when an equal multiple, i.e., m = 1, am and bm are a1 and b1, respectively, and their values are a1 = b1 = 2f.

The change in the optical path length between the original 1 and the lens 8 when the magnification is equal to the magnification m is Δa = a1-am, and the change in the optical path length between the lens 8 and the drum 15 When b is Δb = bm-b1, Δa and Δb are as follows.

Δb = bm-b1 = (1 + m) f-2f = (m-1) f .... (6)

1 is an explanatory view of the optical cradle of the magnification-converting copying apparatus of the present invention, and when the magnification is changed, the support 13 of the fourth mirror 11 and the fifth mirror 12 (hereinafter referred to as a third support) If the distance of the support 7 (hereinafter referred to as the second support) of the second mirror 5 and the third mirror 6 to move to the left, respectively, x and y, respectively, x and y are as follows. .

로 주어질때 x에 관한 y는 다음과 같다.x is given by equation (7)

Given by, y for x is

In equation (7), m is

(f = focal length of the lens)

Substituting equation (9) into equation (8), y is:

로 할때 완전한 상이 드럼(15)의 표면에 결상되려면 제2지지체(7)의 이동변위 y는 식(10)에서와 같이

가 얻어져야 한다.That is, the displacement of the third support 13

When the complete image is formed on the surface of the drum 15, the displacement y of the second support 7 is expressed by Eq. (10).

Should be obtained.

인

만큼 떨어져 있고, 직선 m과 직선 M의 직교점을 C라고 하고, 선분 h와 직선 M의 교점을 D라 하고, 선분 h와 직선m과의 교점을 E라 하면 점 C,D,E들은 한점에 일치한다. 그러나 확대일때는 제1도의 제3지지체(13)의 위치를 점선으로 표시한 13'의 위치로, 즉 좌측 방향으로 x'만큼 이동한 것과 동일하게 점 D의 위치를 점 D'(이는 선분 h'와 직선 M의 교점이다)의 위치로 z'=(nx')만큼 이동시키면 점 E가 선분 h'와 직선 m의 교점 E'으로 이동한다. 이때 선분 CE'의 길이 l'는 삼각형의 닮은 꼴의 원리로부터 얻어진다. l'의 z'에 관한 표현은 다음과 같이 유도된다.2 is an explanatory diagram showing the principle of a mechanism for interlocking the third support 13 and the second support 7, wherein the line segment AB of length f and the straight line m are the focal lengths of the lens 8;

sign

If the intersection of the straight line m and the straight line M is C, the intersection of the line segment h and the straight line M is D, and the intersection of the line segment h and the straight line m is E, the points C, D, and E are one point. Matches. However, at magnification, the position of the point D is the same as that of the third support 13 shown in FIG. If you move z '= (nx') to the position of 'and the intersection of the straight line M), the point E moves to the intersection E' of the line segment h 'and the straight line m. The length l 'of the line segment CE' is obtained from the principle of similarity of triangles. The expression for z 'of l' is derived as follows.

이다.ΔABD 'and △ CE'D' are the same as AD ': CD' = AB ‥ CE 'is established and AD' = Z ', AB = f and CE' = l '

to be.

In the case of the reduction, the position of the point D is moved to the point D ″ in the same manner as the position of the third support 13 in FIG. It moves to the position of the line segment h ″ and the straight line N) by (-z ″) = (-nz ″) and the point E moves to the intersection E ″ of the line segment h ″ and the straight line m ″. The length -l "of the line segment CE" is obtained from the principle of similarity of triangles. The expression for "z" of l "is derived as follows.

,

이고

이다.ΔABD ″ and ΔCE ″ D ″ look similar, so AD ″: CD ″ = AB: CE ″ holds and AD ″

,

ego

to be.

만큼 좌측으로 변위한다. 그러므로 제2지지체(7)는

만큼 변위한다. 그런데 Z=nx이므로 이 관계를 대입하면

이다. 이는 상기한 식 (10)과 일치한다. 따라서, 제2도 및 제3도에 도시한 방법으로 와이어로우프(29)를 연결하면 제3 지지체(13)에 연동하여서 제2 지지체(7)가

의 관계로 변위한다.As can be seen from the above, if the enlargement or reduction is carried out according to the principle of FIG. 2, the point E can be displaced by l 'in the right direction by displacing the third support 13 by the left direction irrespective of the enlargement and reduction. have. Next, as shown in FIG. 4, when the wire rope 29 is connected, the second support 7

To the left. Therefore, the second support 7

Displace by. But Z = nx, so substituting this relationship

to be. This is consistent with the above equation (10). Therefore, when the wire rope 29 is connected by the method shown in FIGS. 2 and 3, the second support 7 is interlocked with the third support 13.

Displacement in relation to.

3 is an exemplary view illustrating the present invention in which the above principle is actually applied.

Reference numerals 20, 22, 38, 40, 42, 44, 51, and 56 are pulleys, and 19, 21, 37, 39, 41, 43, 50, and 55 are shaft pins which rotatably extend the pulley. The pulley 18 is fixed to the shaft 17 of the drive source 16 for scanning exposure. The pulley 49 is fixed to the shaft 48 of the shift drive motor 47, and the pulley 24 is a flow pulley which is rotatable to the pin 23 fixed to the second support 7. The pulleys 53 and 54 are pulleys which are bonded to be rotatable at the same time. The pulleys 53 and 54 each have a diameter D ₁ and D ₂ and are rotatably formed with respect to the pins 52 fixed to the main body. In addition, the shaft 25 fixed to the shaft plates 26 and 27 of the main body of the copier is a guide member which serves to enable linear reciprocating operation of the first support 4 and the second support 7, and the copier main body. The shaft 67 fixed to the portions 45 and 46 is a guide member that serves to enable the linear reciprocating operation of the third support 13, and the shaft fixed to the copier body portions 61 and 62 ( 63 is a guide member for reciprocating the slide 64 up and down.

The wire rope 29 serves to move the first support 4 and the second support 7 at a speed ratio of 1 to 1/2 during the scanning exposure, and the first support 4 is stopped at a position. It is a wire transmission mechanism that serves to move the second support 7 only to enable the magnification conversion, and one end thereof is fixed to the left side of the wire fixture 28 fixed to the first support 4, and then pulleys 22 and 20 After winding a plurality of times on the pulley (18) via a) through the pulley 20, the flow pulley (24), pulley (40) and pulley (38) sequentially and the support fixed to the copier main body 30 In the wire fixture 36 inserted to rotate in the hole 35 of the sliding member 34 sliding along the outer surface the lever 33 is rotated with the pin 31 inserted in the (32) as the center of rotation After being fixed, it is fixed to the right side of the wire fastener 28 fixed to the first support 4 via the flow pulley 24 via the pulleys 44 and 42.

On the other hand, the first support 4 and the second support 7 are respectively coupled to the bush 68, 69 to enable the linear reciprocating motion along the axis 25 to the portion of the wire rope 29 is connected to The other end is supported by the roller which is not shown in figure. The third support 13 is coupled to the bushing 70 to enable the linear reciprocating motion along the shaft 67, the portion of the side connected to the wire rope 59, the other end is supported by a roller not shown in the figure have.

의 관계가 있으므로 Z=nx로 된다.The wire rope 59 is fixed to the right side of the wire fastener 57 fixed to the third support 18, and then feels several times on the pulley 53, and then the drive motor 47 for shifting via the large pulley 51. It is wound several times by the pulley 49 fixed to the and shaft 48, and is fixed to the left side of the wire fixture 57 via the pulley 51 again. The wire rope 60 is fixed to the lower side of the wire fastener 71 fixed to the sliding member 64, and wound around the pulley 54 multiple times via the pulley 55, and then fixed to the upper side of the wire fixture 71. It is. On the other hand, since the pulleys 53 and 54 can rotate at the same time, the movement displacement x of the third support 13 and the movement displacement of the sliding member 64 are

Since Z = nx since there is a relationship

만큼 변위하면서 유동풀리(24)가 좌측으로

만큼 변위하여 원하는 배율에 따라 제3지지체(13)에 연동하여 제2지지체(7)가 주어진 배율의 위치로 변위되어 배율이 정해진다.Since the connection of the wire ropes 29, 59, and 60 is as described above when the magnification is changed, the small pulley 49 fixed to the shaft 48 of the shifting drive motor 47 rotates and At the same time, the large pulley 51 rotates and at the same time, the third support 13 is displaced by x to the left, and the slide 64 is displaced by z upwards, while the link between the flow pulleys 24 is interposed. According to the principle of the mechanism, the lever 39 rotates with the pin 31 as the center of rotation, so that the slide 34 moves along the lever 33 so that the wire stopper 35 moves to the right.

Flow pulley (24) to the left

As a result of displacement, the second support 7 is displaced to a position of a given magnification in accordance with the third support 13 according to the desired magnification, thereby determining the magnification.

On the other hand, the displacement of the third support is measured by a potentiometer (58), and the difference between each other with respect to the desired position of the third support (13) according to the output and the magnification of the potentiometer (58). The third support 13 is controlled by the input of the motor 47.

In addition, when the third support 13 and the second support 7 are moved to a position corresponding to the magnification during scanning exposure, the first support 4 and the second support 7 have a speed of 1: 1/2. It exposes in rain. This is because the pulley 24 is a floating pulley and the first support 4 is fixed to the wire rope 29.

As described above, the present invention uses only one drive motor for shifting, and thus, manufacturing cost is lower than that of using a plurality of motors, and since the lens does not move, excessive force is not applied to the lens mechanism. It is possible to increase the resolution and to reduce the difficulty of manufacturing a cam and the error of manufacturing caused by the method of using a flexible cam, and to convert the magnification by using a link mechanism. This has the advantage of allowing continuous conversion without permission.

Claims (3)

A continuous magnification-converting copying apparatus, comprising: first mirror support moving in a direction parallel to the optical axis, second and third mirror supports moving in a direction parallel to the optical axis, and fourth moving in a direction parallel to the optical axis And a wire transmission mechanism for transmitting the fifth meter support, the first mirror support and the second and third mirror supports at a speed ratio of 1 1/2, and for shifting to drive the fourth and fifth mirror supports. A drive mechanism and a power transmission mechanism for transmitting the power of the drive motor for shifting the fourth and fifth mirror supports, and a mechanism for shifting by moving the fourth and fifth mirror supports and the second and third mirror supports together. Continuous magnification conversion copying apparatus comprising the. The continuous magnification converting copying apparatus according to claim 1, further comprising a transmission mechanism for transmitting the power of the shift drive motor to the fourth and fifth mirror supports. The apparatus of claim 1, wherein the mechanisms in which the fourth and fifth mirror supports and the second and third mirror supports are moved together to change the displacement of the fourth and fifth mirror supports x, the second and third mirror supports. When y is the displacement of y, the displacement of the second and third mirror supports is y

The ratio of the diameters of two pulleys rotating together with the flow pulley

Continuous magnification change copying apparatus characterized by link mechanism via in pulley.

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