JPS58166337A - Traveling device for optical system - Google Patents

Abstract

PURPOSE:To smooth the stopping of scanning in an optical device which uses the 1st mirror and the 2nd mirror traveling at a 1:1/2 speed ratio relatively with each other in scanning and exposing of an original, by disposing both traveling bodies slidably on the same shaft, and bringing both traveling bodies in contact with each other at both ends of the scanning width. CONSTITUTION:The 1st mirror system 3 and the 2nd mirror systems 4, 5 move at a 1:1/2 speed ratio relatively with each other, and project the image of an original 0 through a lens 6 to a sensor 7. The 1st traveling body 8 which holds the system 3 and the 2nd traveling body 9 which holds the system 4, 5 are disposed slidably on a shaft 11. Both bodies 8, 9 are brought into contact with each other at the start and end points of scanning; therefore, even if the traveling is not blocked by a special elastic body, the traveling is stopped smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical running video ttvc used in copying machines, facsimile machines, and the like.

In copying machines, facsimile machines, etc., two mirror systems are used as devices for optically reading and scanning stationary originals.
It is known that the vehicle is made to travel back and forth at a speed ratio of . As a related known technique related to such a device, for example, one proposed in Japanese Patent Application Laid-open No. 56-149066, in which a cross-section member is disposed at the scanning end of the traveling body, and the traveling body moves inertly. 2773 body
The receiver is stopped by 7 members to absorb the shock when stopped and prevent vibrations that adversely affect the image. Rubber, felt, springs, air pistons, etc. are used as cushion members. There is. In addition, a device has been proposed in Japanese Unexamined Patent Publication No. 5 (S-154762), but this device uses an elastic body between the bearings of two traveling bodies traveling in the same direction at a speed ratio of 1:3A. is provided, and the elastic body is deformed at the forward end position to absorb the impact when the traveling body stops.

In the case of the above two rows, both use elastic bodies to absorb the shock when the traveling body stops, and an extra stroke is required for the deformation of the elastic body.
It is necessary to shorten the effective scanning distance of the traveling body or to narrow the mutual distance between the bearing parts of the traveling body, which poses a problem in running the traveling body stably. Particularly in recent years, advances in drive technology have made it easier to use servo motors, etc., and there are fewer (or fewer) cases of such problems occurring during driving.

That is, such a motor is involved not only in driving but also in braking, and for example, when braking, a current is applied to the motor so as to drive the traveling body in the opposite direction.

When controlling the movement of a running body using a servo motor, if an elastic body is installed in the running system, the movement of the running body becomes impossible to control due to the coexistence of this elastic body. It is better not to use .

The present invention has been made in view of the above circumstances, and is an optical system capable of stable running without the need for an elastic body for absorbing shock while receiving and stopping a traveling object, or a special stopper for stopping the traveling object. The purpose is to provide traveling equipment.

The invention will be explained below with reference to the illustrated embodiments.

FIG. 1 shows a schematic front configuration diagram of an IJK41 [lII consideration reader] which is an application example of the present invention.
A document 0 placed flat on a 1g glass i is illuminated by a rung 2, and the reflected light from the document is reflected by a first mirror 3. After passing through the second mirror system 4 and 5, it is projected onto the 7/7 by a lens 6. Scanning of the original species is performed by main scanning by the self-scanning of the sensor 7 and sub-scanning by the sg+mirror 3 and the second mirror system 4 and 5. The sub-scanning is performed using lamps 2 and 1.
The i-th traveling body 8 equipped with the mirror 5 moves in the direction of the arrow at a speed V,
Further, the second traveling body 9 equipped with the second mirror systems 4 and 5 moves in the same direction at a speed of 4, respectively.

The first traveling body 8 reciprocates between the 11th position on the scanning start side and the lL2 position on the scanning path r side, and the second traveling body 9 is at the same <b
It travels back and forth between position 1 and position b2, and cannot travel outside this range. Figure 2 and IJp,
In FIG. 3, the first traveling body 8 equipped with the rung 2 and the first mirror 3, and the second traveling body 9 equipped with the second mirror system 4 and 5 have bearing portions 8a+8b*9a1.
9b is fitted onto a guide shaft 11 parallel to the document placement glass plate, so that it can freely slide on the guide shaft. Both shaft shoulders of the 8 guide shaft It are fixedly supported by a pair of non-stop side plate grains 13, 2.The two bearing parts 9a+9a of the second running group 9 are fixedly supported during this time. It is arranged so as to straddle the bearing portions 8a+8b of the body 8. In addition,
The main body side plates 12.15 constitute an example of a fixed member in a stationary state.

Figure 2 shows the state in which the first and second traveling bodies 8.9 are respectively placed at the scanning start positions a and +b 1 ft (see Figure 1), and Figure 3 shows the first and second traveling bodies 8. The second traveling body 8.9 is shown in the scanning path 1 position and 21b2 position, respectively. In other words, each traveling body travels 4 m in the forward direction between the two end positions of this traveling distance. Note that the first and second running bodies 8.9 are of the known type,
It is driven back and forth at a speed ratio of 1:34 by a drive mechanism that combines a fixed pulley, a movable pulley, and a loop wire, and since this drive mechanism disease is already known, I will not explain the details. The explanation will be omitted here.

Now, in Figure 5g2 and Figure g6, the main body side plate 12A5
1-interval? Maximum scanning distance YL8 of the cage and first traveling body 8, @
22 Bearing portion 9b and side plate 1 at scanning start position of scanning body 9
2 'It O, s The distance between the bearing part 9a and the side plate 16 at the scanning path 1 position C2, the bearing part 9b of the second traveling body 9, b The distance between the bearing parts 8a and 8b of the body 8 kl, Assuming that the distance between the bearing portions 9a and 9b of the SLL traveling body 9 is 12, the following equation is derived.

l! 1"LA"5-81"2-CI-C2"'(
') On the other hand, the maximum scanning distance L8 is the scanning distance of the first traveling body 8, whereas that of the second traveling body 9 is naturally LS/2
Therefore, the following equation is derived and becomes equation (1).

From equation (2), 11. I! 21 (each can be determined.

12 =LA-Ll/! 0,02 ・・・・・・(2
) The feature of this invention is that the maximum scanning distance L8=
00 state, that is, the state shown in FIG. 2, the outer end of the bearing portion 8b of the first traveling body 8 and the inner end of the bearing portion 9b of the second traveling body 9 are in contact with each other, and the maximum scanning distance L8 is similarly determined. =L8, that is, the state shown in Figure 5g6, the outer end of the bearing portion 8a of the first traveling body 8 and the inner end of the bearing portion 9a of the second traveling body 9 are in contact with each other. Furthermore, a distance C7 is provided between the outer end of the bearing portion 9b and the side plate 12 at u5, and a distance 11MC2 is provided between the outer end of the bearing portion 9a and the side plate 13, respectively.

In other words, the traveling bodies come into contact with each other before they come into contact with the side plates of the main body, so to speak, before they collide. The running body is
If it comes into direct contact with the side plate of the stationary main body, there is a risk that the traveling body or the measuring plate will be damaged due to the large speed difference. Conventionally, elastic bodies have been used to prevent this damage.

For this purpose, it is necessary to make the intervals C1 and C2 thick to some extent, and it is difficult to set the values of Ls, 11, and 1!2 large.

In the device of the present invention, the traveling bodies come into contact with each other and stop while moving in the same direction.
Since the speed difference is small and the collision time is long, there is no risk of damage to the traveling object, etc., even without using an elastic body as described above. Note that it is sufficient for the distance C4°C2 to be about 5 mm each. In addition, the example shown in the culvert 2 is the second traveling body 9.
These bearings are positioned between the two bearings 9a, 9b of the first traveling body 8 so as to straddle the two bearings 9a, 9b. Although it is necessary to make it considerably smaller than 1V, it can be set larger than B8 for LA.

FIG. 4 shows another embodiment, and each member is given the same reference numeral as in FIG. 2 for convenience.

In this embodiment, each traveling body is arranged so as to alternately straddle the bearing portion of each traveling body, and l! 1 can be set as thick (1), and l4.12 can be made equal.

FIG. 4 shows a state where Ml and the second traveling body 8.9 are placed at the traveling start position, and the inner end of the bearing portion 8a of the first traveling body 8 and the bearing portion of the second traveling body 9 are shown. 9b are in contact with each other, and one bearing portion 8b of the first traveling body 8
A gap 01 is provided between the outer end of the main body side plate 12 and the outer end of the main body side plate 12 . FIG. 5 shows a state in which the first and second traveling bodies 8.9 are placed at the travel end position, and the bearing portions 8a*8b of the first traveling body 8 at the 2Wi position are attached to the second traveling body 8. 9, the outer end of the bearing portion 9a of the second traveling body 90 and the main body side plate 1.
3, a distance C2 is provided between the two. /1+1!2
The relational expression for determining Y is the following gguchi (.In addition,
In the formula, B is the width of the bearing portion 9a.

I! , = 1!2= I, A-LS-8-0, -02 By doing so, the bearing part spacing l! of the first traveling body 8 when scanning a relatively long distance at high speed. 1 can be set thicker (this allows the traveling body to run stably. In this case as well, C4 and C
For No. 2, it is sufficient to set this to about 5 mm.

As described above, according to the present invention, since the traveling body can be stopped within the range of the effective scanning distance of the traveling book, there is no need to move the traveling body unnecessarily, and the interval between the bearing parts of the traveling body can be set large. , stable running of the running body can be achieved. Furthermore, since there is no need to use an elastic body to absorb shock from the traveling body, there is no need to consider resonance phenomena during driving.
It is possible to use a servo motor or the like. Further, when the traveling body is running abnormally, the traveling body can be stopped without coming into contact with a stationary fixed member, so that damage to the traveling body or the fixed member can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an original species deliberate reading device which is an application example of the present invention, FIG. 2 is a diagram showing a scanning start state of an optical system traveling device according to an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing the scanning start state of the optical thread traveling device of another embodiment; FIG. 5 is a diagram showing the scanning completion state of the optical thread traveling device of another embodiment. be.

Claims (1)

[Claims] 1. A first traveling body including a guide shaft parallel to a document placement glass on which a document is placed, and a first mirror system. a second traveling body equipped with a second mirror system, each bearing provided on the first and second traveling bodies is slidably supported on the guide shaft, and the first and second traveling bodies are slidably supported. In an optical system traveling device that scans a document by traveling in the same direction on a guide shaft at a speed ratio of %, the traveling body is a fixed member that is placed in a stationary state near both ends of the scanning distance. An optical system traveling device characterized in that the mutual spacing between the bearing parts of each traveling body and the width of the bearing part itself are determined so that the respective traveling bodies come into contact with each other. 2. The bearing portion of the second traveling body is configured to straddle the bearing portion of the first traveling body, and before the second traveling body contacts the fixed member near both ends of travel, the bearing portion of the second traveling body straddles the bearing portion of the first traveling body. 6. The optical system traveling device according to claim 1, wherein the mutual spacing and width are determined in accordance with 6J:5. 3. Each bearing part is configured to alternately straddle the bearing parts of the first and second running bodies, and before the first running body abuts the fixed member at a position near one running end, the second running body It came into contact with the body and the M22 running body. Claim I!, characterized in that the mutual spacing and width are determined so that the first traveling body contacts the first traveling body at a position near the other running end before contacting another fixed member! i, jI
The optical system traveling device according to section I.