JPH10333260A - Scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a scanner constituted so that the position of a scanning driving transmission means can be directly and easily adjusted without disassembling the scanner when the movement of a traveling body becomes dull because positional deviation is caused between the fixed end side and the free end side of the traveling body by the secular change of the scanning driving transmission means and the like. SOLUTION: This device is constituted so that an image is formed on a photoreceptor drum by executing the slit-exposure of the image and provided with the traveling body moved by a driving source so as to scan the surface of the original and the scanning driving transmission means 3 transmitting the driving force of the driving source and moving the traveling body. One side of the traveling body is provided with a linear movement guide part and both sides thereof are provided with pulley parts 4 where the transmission means 3 is hung so that the position of at least one of the pulley parts 4 in the traveling direction can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning device using slit exposure which is used in an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art In general, a scanning device used in an image forming apparatus such as a copying machine has a first traveling body having an illumination light source and a mirror and a second traveling body having a return mirror. (2) The traveling body is made to run parallel to the original surface and the second traveling body is run at half the traveling speed of the first traveling body. After scanning, the reflected light from the original surface is reflected by the mirror of the first traveling body and the return mirror of the second traveling body, and is guided to the photosensitive drum through the imaging lens, whereby the image of the original is statically placed on the photosensitive drum. It is formed as an electrostatic latent image. Scanning devices used in recent image forming apparatuses are required to have high-speed scanning and high image quality. In order to satisfy these, the following configuration is adopted to realize stable running performance and a uniform sliding load, thereby improving the running performance of the scanning device.

[0003] The scanning device mainly comprises a linear guide rod, a traveling body having a linear motion guide fitted to the guide rod, a wire rope as scanning drive transmitting means, and the like. More specifically, the traveling body of the scanning device is provided on one side in the longitudinal direction with a linear guide for guiding the traveling body in the scanning direction and regulating the position in the direction perpendicular to the scanning direction. Have been. The linear guide has a cylindrical hole in the scanning direction, and a guide rod extending in the scanning direction penetrates the hole. Therefore,
The traveling body is guided in the scanning direction by the guide rod and the linear guide, and the position in the direction perpendicular to the scanning direction is regulated.

Further, scanning drive transmitting means composed of a wire rope or the like is connected to both sides in the longitudinal direction of the traveling body, or the scanning drive transmitting means is hung on pulleys provided on both sides in the longitudinal direction. The driving force of the drive motor is transmitted to the traveling body by the scanning drive transmission means, and the traveling body can move in the scanning direction. As described above, when the traveling body moves in the scanning direction, the original is scanned while performing slit exposure, and the original image is projected onto the photosensitive drum via the mirror and the imaging lens attached to the traveling body.

[0005]

In the scanning apparatus constructed as described above, one side in the longitudinal direction of the traveling body is a guide support end side supported by a guide rod and a linear guide, and the other side is a guide support end. Is a free end. For this reason, when the length of the wire rope, which is the scanning drive transmission unit, changes over time, a positional shift in the scanning direction may occur between the guide support end side and the free end side. As a result, the linear guide portion of the traveling body is twisted with respect to the guide rod, and a wedge effect is generated. Can not be done.

If the length of the wire rope, which is the scanning drive transmission means, changes with time (usually, the length increases), the length of the wire rope is adjusted to guide and support the traveling body. The deviation between the end side and the free end side must be eliminated. However, in the scanning device configured as described above, since the means for directly adjusting the length of the wire rope is not provided, the scanning device is disassembled and the length of the wire rope changes with time. There is a problem that a corresponding adjustment must be made.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and the guide support end side and the free end side of the traveling body are changed by a change in the length of the scanning drive transmitting means with time. In the case where the movement of the traveling body becomes uncomfortable due to a positional deviation between the scanning side and the side, the scanning can be directly and easily adjusted according to the temporal change of the scanning drive transmission means without disassembling the scanning device. It is intended to provide a device.

[0008]

According to the first aspect of the present invention,
2. Description of the Related Art In a scanning device that forms an image on a photosensitive drum by slit exposure of an original, a traveling body that moves by a driving source to scan the original surface, and a scanning drive that transmits the driving force of the driving source to move the traveling body Transmission means, a linear motion guide portion is provided on one side of the traveling body, and pulley portions on which the scanning drive transmission means are respectively provided are provided on both sides of the traveling body, and pulley portions on both sides are provided. Is provided on the traveling body such that the position in the traveling direction can be adjusted. According to a second aspect of the present invention, in the first aspect of the invention, there are two traveling bodies, and the peripheral speed of the photosensitive drum is V,
When the magnification of an image to be formed is m, one of the traveling bodies travels at a scanning speed of V / 2m, and one of the pulleys provided on both sides of the traveling body can adjust the position in the traveling direction. Is provided on the one of the traveling bodies.

According to a third aspect of the present invention, in the first aspect of the invention, the pulley portion provided so as to be capable of adjusting the position in the scanning direction has two pulleys, and each pulley has a different support shaft. , And the scanning drive transmitting means is independently hung on each pulley.

According to a fourth aspect of the present invention, in the first aspect of the invention, the pulley portion provided so as to be adjustable in the traveling direction has two pulleys, and each pulley has the same support shaft. And the scanning drive transmission means is independently wound around each pulley.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the pulley portion provided so that the position in the traveling direction can be adjusted has a pulley having two grooves formed therein. Wherein the scanning drive transmitting means is independently wound.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a scanning device according to the present invention will be described with reference to the drawings. FIG.
, 1 is a drive motor as a drive source, 2 is a drive pulley, 3 is a wire rope as a scanning drive transmission means, 100 is a first traveling body, 100-a is a linear guide for the first traveling body, 100-b is a first mirror holding portion of the first traveling body, 101 is a second traveling body, 101-a is a linear guide portion of the second traveling body, and 101-b is a second mirror holding portion of the second traveling body. , 103-a and 103-b indicate guide rods, respectively.

The driving force of the driving motor 1 is transmitted to the driving pulley 2 via a belt 5 so that the driving pulley 2
Is transmitted to a pair of pulleys 6 attached to the same shaft 7, and is transmitted to a first traveling body 100 directly connected to the wire rope 3 via one wire rope 3 wound around the pulleys 6 and 6. The first traveling body 100 is movable in a direction orthogonal to the length direction. The one wire rope 3 is provided with an appropriate folding pulley attached to the image forming apparatus main body in addition to the pulleys 6 and 6,
It is folded back by pulleys 4, 4 ′ attached to the free end side and the guide support end side of the traveling body 101, and
The second traveling bodies 100 and 101 are symmetrically stretched on both longitudinal sides. The structure for stretching the wire rope 3 is well known. By stretching the wire rope 3 in this manner, the first traveling body 100 moves in parallel at a predetermined speed, and the second traveling body 101 moves at a speed half the speed of the first traveling body 100. It is designed to translate in the same direction as 100. Here, when the peripheral speed of the photosensitive drum 10 described later is V and the magnification of the formed image is m, the first traveling body 100 travels at the scanning speed V, and the second traveling body 101 travels at V / 2m. Run at scanning speed. The first traveling body 100 has one end in the length direction on the guide support end side, and is guided by a guide rod 103-a and a linear motion guide 100-a, which will be described in detail later, and has the other end. It is on the free end side, and travel is guided by being guided by a guide rail (not shown).

A first pulley portion 4 is provided on both sides in the longitudinal direction of the second traveling body 101, that is, on one side on both left and right sides as viewed from the traveling direction.
However, a second pulley portion 4 'is attached to the other side. The wire rope 3 is folded back around the first pulley portion 4 and the second pulley portion 4 ′, so that the second traveling body 101 moves the first traveling body 100 in a direction orthogonal to the length direction. It can move at half the speed. Specific configurations of the first pulley unit 4 and the second pulley unit 4 'will be described later.

The mounting structure of the first traveling body 100 and the second traveling body 101 will be described in more detail. In FIG. 2, the guide rods 103-a and 103-b are arranged so as to be substantially perpendicular to the rotation axis of the photosensitive drum 10. The first traveling body 100 is separable and detachable from the linear guide unit 100-a and the first mirror holding unit 100-b.
The traveling body 101 includes a linear motion guide unit 101-a and a mirror holding unit 1.
01-b. Each of the mirror holding units 100-b and 101-b is a screw 110
To the linear motion guides 100-a and 101-a, respectively.

Both the linear motion guides 100-a and 101-a of the first and second traveling bodies 100 and 101 are provided with cylindrical holes parallel to the scanning direction, respectively. Rods 103-a and 103-b penetrate.
Therefore, the first traveling body 100 and the second traveling body 101 can travel along the guide rods 103-a and 103-b, respectively, and also have the guide rods 103-a and 103-a.
The position in the direction orthogonal to the traveling direction is regulated by the 103-b and the linear motion guides 100-a and 101-a. Then, the first traveling body 100 and the second traveling body 10
Reference numeral 1 denotes an original which is moved by the driving force of the driving motor 1 transmitted by the wire rope 3 (see FIG. 1) to scan the original as described above, and the original image is projected on the photosensitive drum 10 to form an electrostatic latent image. Is formed.

As shown in FIG. 3, the first mirror 12 is provided on the first mirror holding portion 100-b of the first traveling body 100, and the second mirror is provided on the mirror holding portion 101-b of the second traveling body 101. 13 and a third mirror 14 are respectively attached. Each reflection mirror is arranged at a predetermined optical position in order to project a document image on the surface of the photosensitive drum 10. As shown in FIG. 3, a first traveling body 100 and a second traveling body 1
01 are arranged. The first traveling body 100 has an exposure lamp 11 and a first mirror 12, and the exposure lamp 11 and the first mirror 12 can be moved integrally. The first mirror 12 reflects light reflected from the document 16 in the horizontal direction.

The second traveling body 101 is provided with a second mirror 13.
And the third mirror 14, and the second and third mirrors 13 and 14 are integrally movable. The second and third mirrors 13 and 14 are obliquely arranged so that their reflection surfaces are at right angles to each other, and fold the reflected light from the first mirror 12 in the horizontal direction.

The first traveling body 100 and the second traveling body 101 are
As described above, the guide rods 103-a, 103-b,
The traveling is guided by the linear motion guides 100-a and 101-a, the position is regulated, and the wire rope 3 (FIG.
(See FIG. 2), and moves in a direction perpendicular to the length direction by the driving force of the driving motor 1 transmitted by the driving motor 1). When the first and second traveling bodies 100 and 101 are traveling, the first traveling body 100 is moved in the second traveling direction in order to keep the optical distance from the document 16 being exposed to the photosensitive drum 10 constant. The wire rope 3 is directly connected to the first traveling body 100 so as to move at twice the speed with respect to the body 101, and the first rope of the second traveling body 101
The pulley portion 4 and the second pulley portion 4 'are respectively folded back and hung.

As shown in FIG. 3, the illuminating light emitted from the exposure lamp 11 illuminates the original 16 placed on the contact glass 15 in a slit shape, and the reflected light on the surface of the original 16 is The first mirror 12, the second mirror 13, and the third mirror 14 are reflected in this order and passed through the lens 17 to the fourth mirror 1.
The light is reflected in the order of the eighth, fifth, and sixth mirrors 19, 20, passes through the dustproof filter 21, and projects a document image on the photosensitive drum 10. The scanning control of the scanning optical system is performed by feedback control based on pulses output from an encoder or the like built in the drive motor 1 according to the scanning distance. The fourth mirror 18, the fifth mirror 19, and the sixth mirror 20 are fixed.

In the scanning device constructed as described above, at the initial stage, the length of the wire rope 3 serving as the scanning drive transmitting means is adjusted and the linear motion guide portion is provided so that the scanning device can normally scan the original. 100-a and first mirror holding unit 1
The position adjustment with respect to 00-b, the position adjustment between the linear guide unit 101-a and the second mirror holding unit 101-b, and the like are performed.

As described in the section of the problem to be solved by the invention, in the scanning device configured as described above, one side of the first traveling body 100 and the second traveling body 101 is connected to the guide rod 103-a. , 103-b and the linear guide unit 10
0-a and 101-a are on the guide support end side, and the other side is on the free end side. If it changes, a displacement occurs between the guide support end side and the free end side of the traveling body, and as a result, the linear motion guide portion 100 moves with respect to the guide rods 103-a and 103-b.
-A, 101-a is twisted and the movement of the running body becomes less
In some cases, a good image cannot be formed due to occurrence of jitter or the like in the image.

Accordingly, the present invention is directed to a case where the position of the guide supporting end and the free end of the traveling body shifts due to a temporal change in the length of the scanning drive transmission means and the movement of the traveling body becomes reluctant. This makes it possible to directly and easily adjust the length of the scanning drive transmitting means in response to a temporal change without disassembling the scanning device. Hereinafter, various specific examples thereof will be described.

FIGS. 4A and 4B show an example of the structure of the first pulley section 4 which can perform adjustment corresponding to the temporal change of the length of the scanning drive transmitting means. FIG. 4 (a)
As shown in FIG. 5, the first pulley portion 4 mainly includes a stepped bracket 4-b formed by bending and a bracket 4-b.
And a pulley 4-a rotatably mounted on the support shaft 4-c. The pulley 4-a has two upper and lower circumferential grooves, and a wire rope 3 serving as a scanning drive transmitting means is independently hung and folded in each groove. FIG. 4B shows a cross section in a state where the wire rope 3 is independently hung in each groove. A round hole 107 is formed at the center in the lower part on both sides of the bracket 4-b, and a long hole 108 long in the running direction of the running bodies 100 and 101 is formed on both sides of the round hole 107. I have. Therefore, slot 1
08 are formed in total of four.

The round holes 107, 107 have fixing screws 10
6 and 106 are inserted, and the fixing screws 106 and 106 are screwed into the mirror holding portions 101-b (see FIGS. 1 and 2) of the second traveling body 101, whereby the first pulley portion 4 is connected to the mirror holding portions 101. −b. On the other hand, four bosses 105 formed to stand up on the mirror holding portion 101-b pass through the four long holes 108. Accordingly, the first pulley portion 4 is moved within the range of the elongated hole 108 by using the elongated hole 108 and the boss 105 as a guide.
It is possible to slide in the running directions 0 and 101.

As described above, the first pulley section 4 of the second traveling body 101 is provided on the second mirror holding section 101-b so that the position of the second traveling body 101 in the traveling direction can be adjusted. Therefore, when the length of the wire rope 3 serving as the scanning drive transmitting unit changes with time, the fixing screw 106 screwed into the mirror holding unit 101-b through the round hole 107.
To adjust the position of the first pulley portion 4 by sliding the first pulley portion 4 in the traveling direction of the second traveling body 101, and to make an adjustment corresponding to a change in the length of the wire rope 3. it can. After the adjustment, each fixing screw 106 is screwed in to fix the first pulley unit 4 to the second mirror holding unit 101-b.

As described above, according to the example shown in FIG. 4, the length of the scanning drive transmitting means changes over time, and the like.
If the movement of the second traveling body 101 becomes uncomfortable due to a displacement between the guide support end side and the free end side of the traveling body 101, the first pulley unit 4 can be moved to the traveling body 101 without disassembling the scanning device.
By adjusting the position of the first pulley section 4 by sliding in the traveling direction, the adjustment corresponding to the temporal change of the scanning drive transmitting means can be performed directly and easily.
Further, when the moving directions of the wire ropes 3 as the scanning drive transmitting means are the same, two grooves may be formed in one pulley 4-a as in the example shown in FIG. There is an advantage that the number of parts is reduced.

The first pulley section 4 is not limited to the configuration shown in FIG. 4, but may be configured as shown in FIGS. The first pulley portion 4 shown in FIG. 5A is mainly composed of a stepped bracket 4-b-1 and a two-step planted on the upper stage of the bracket 4-b-1 in the running direction of the running body. Support shafts 4-c, 4-c, and a pulley 4-rotatably mounted on these support shafts 4-c, 4-c.
a-1 and a pulley 4-a-1.

Each pulley 4-a-1 has one groove formed therein, and the wire rope 3 as a scanning drive transmitting means is independently hung on the groove of each pulley 4-a-1. Is folded back. FIG. 5B shows a cross section in a state where the wire ropes 3 are independently hung in the grooves of the respective pulleys 4-a-1. A round hole 107 is provided at the center of each lower step on both sides of the bracket 4-b-1.
A long hole 108 is formed on both sides of the round hole 107 in the running direction of the running body. Therefore, a total of four long holes 108 are formed.

A fixing screw 106 is inserted into each of the round holes 107, and the fixing screw 106 is connected to the second traveling body 101 (FIG. 1,
2), the first pulley unit 4 is fixed to the mirror holding unit 101-b. On the other hand, each of the long holes 108 is inserted into each of the bosses 1 formed so as to rise in the mirror holding portion 101-b.
05 penetrates. Therefore, the first pulley unit 4 can slide in the traveling direction of the traveling body 101 within the range of each of the long holes 108 and each of the bosses 105 penetrating therethrough.

Therefore, as in the example shown in FIG. 4, a positional shift occurs between the guide support end side and the free end side of the traveling body due to a change in the length of the scanning drive transmission means with time, etc. When the movement becomes slow, the position of the first pulley unit 4 can be adjusted directly and easily by sliding the first pulley unit 4 in the traveling direction of the traveling body without disassembling the scanning device. In addition, it is possible to perform an adjustment corresponding to a change in the length of the scanning drive transmitting unit with time. According to the example shown in FIG.
Since the pulleys constituting the first pulley portion 4 are divided into two and arranged in series in the traveling direction, the height of the pulley portion can be reduced as compared with the example shown in FIG.
It is possible to cope with a case where the moving directions of the scanning drive transmitting means wound around each pulley 4-a-1 are different from each other.

Another example of the first pulley will be described. The first pulley portion 4 shown in FIG. 6A mainly includes a stepped bracket 4-b-2 and a bracket 4-b-
2, a support shaft 4-c planted at the center of the upper stage, and two pulleys 4-rotatably mounted on the support shaft 4-c.
a-1. Each of the pulleys 4-a-1
Has one groove formed therein, and each pulley 4-a-
The wire ropes 3 serving as the scanning drive transmitting means are independently hung and folded over the one groove. FIG.
(B) shows a cross section in a state where the wire ropes 3 are independently hung on the grooves of the respective pulleys 4-a-1. A round hole 107 is formed at the center of each lower step on both sides of the bracket 4-b-2, and long holes 108 long in the running direction of the traveling body are formed on both sides of the round hole 107.

Each of the round holes 107 has a fixing screw 1
06 is inserted, and each fixing screw 106 is
Is screwed into the mirror holding portion 101-b (see FIGS. 1 and 2), so that the first pulley portion 4
It is attached to one mirror holding unit 101-b. On the other hand, each boss 105 formed standing up on the mirror holding portion 101-b penetrates each of the long holes 108. Therefore, the first pulley unit 4 uses the long holes 108 and the bosses 105 passing therethrough as guides, and
Can be slid in the traveling direction of the second traveling body 101 within the range of.

Therefore, similarly to the examples shown in FIGS. 4 and 5,
If the displacement of the scanning drive transmission means over time causes a displacement between the guide support end side and the free end side of the traveling body and the movement of the traveling body becomes reluctant, the scanning device does not need to be disassembled. Also, by loosening each fixing screw 106, sliding the first pulley unit 4 in the running direction to adjust the position of the first pulley unit 4, and then tightening each fixing screw 106, directly
In addition, it is possible to easily perform the adjustment corresponding to the change of the length of the scanning drive transmitting unit with time. According to the example shown in FIG. 6, since the two pulleys 4-a-1 are independently rotatably provided on one support shaft 4-c, as in the example shown in FIG. It is possible to cope with the case where the moving direction of the scanning drive transmitting means applied to a-1 is different.

In the examples shown in FIG. 4 to FIG.
The first pulley 4
Is provided so as to be adjustable in position with respect to the traveling body, but the first pulley section 4 may be fixed to the traveling body and the second pulley section 4 'may be provided so as to be adjustable in position relative to the traveling body. Further, both the first pulley portion and the second pulley portion may be provided so as to be adjustable in position with respect to the traveling body. However, if at least one of the first pulley portion and the second pulley portion is provided so as to be adjustable in position with respect to the traveling body, the intended purpose can be achieved. The scanning device according to the present invention can be applied not only to an analog copying machine but also to a digital copying machine, and can also be applied to a facsimile or a scanner as a computer peripheral device.

[0036]

According to the first aspect of the present invention, there is provided a scanning apparatus for forming an image on a photosensitive drum by slit exposure of an original, a traveling body which is moved by a driving source and scans the original surface, Scanning drive transmitting means for transmitting the driving force of the source to move the traveling body, and on one side of the traveling body,
A linear guide portion is provided, and a pulley portion on which the scanning drive transmission unit is hung is provided on both sides of the traveling body, respectively.
Since one of the pulleys on both sides is provided on the traveling body so that the position in the traveling direction can be adjusted, the length of the scanning drive transmission means changes over time and the like, and the guide support end side and the free end of the traveling body. If the movement of the traveling body is reduced due to a positional deviation between the first pulley unit and the second pulley unit without disassembling the scanning device.
By adjusting the position of the pulley by sliding any one of the pulleys in the traveling direction, it is possible to directly and easily perform adjustment and adjustment corresponding to the temporal change of the scanning drive transmission unit.

According to a second aspect of the present invention, in the first aspect of the present invention, when there are two traveling bodies, the peripheral speed of the photosensitive drum is V, and the magnification of an image to be formed is m, one of the traveling bodies is provided. The body travels at a scanning speed of V / 2m, and one of the pulley portions provided on both sides of the one traveling body is provided on the one traveling body so that the position in the traveling direction can be adjusted. By adjusting the position of one of the pulleys provided on the traveling body, it is possible to directly and easily perform the adjustment and adjustment corresponding to the temporal change of the scanning drive transmission unit.

According to a third aspect of the present invention, in the first aspect, the pulley portion provided so as to be adjustable in the scanning direction has two pulleys, and each pulley has a different support shaft. The scanning drive transmitting means is independently hung on each pulley, and the length of the scanning drive transmitting means changes over time, etc., so that the guide support end side and the free end side of the traveling body In the case where the displacement of the traveling body is reduced due to the displacement, the one of the first pulley unit and the second pulley unit is slid in the traveling direction of the traveling body without disassembling the scanning device. By adjusting the position of the pulley portion, it is possible to directly and easily perform an adjustment corresponding to a change in the length of the scanning drive transmitting unit with time. In addition, since the two pulleys of the pulley unit can rotate independently, it is possible to cope with the case where the moving directions of the scanning drive transmitting means applied to the respective pulleys are different.

According to a fourth aspect of the present invention, in the first aspect of the invention, the pulley portion provided so as to be adjustable in the traveling direction has two pulleys, and each pulley has the same support shaft. The scanning drive transmitting means is independently wound around each pulley, so that the length of the scanning drive transmitting means changes over time, etc., so that the guide support end side and the free end side of the traveling body If the movement of the traveling body becomes slower due to the positional shift at, without disassembling the scanning device,
Either the first pulley portion or the second pulley portion is slid in the traveling direction of the traveling body to adjust the position of the pulley portion, so that the time length of the scanning drive transmission means can be directly and easily increased. The adjustment corresponding to the change in the height can be performed. In addition, since the two pulleys of the pulley unit can rotate independently, it is possible to cope with the case where the moving directions of the scanning drive transmitting means applied to the respective pulleys are different.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the pulley portion provided so that the position in the traveling direction can be adjusted has a pulley having two grooves formed therein. Since the scanning drive transmitting means is independently hung, the pulley section is slid in the traveling direction of the traveling body to adjust the position, so that the time length of the scanning drive transmitting means can be directly and easily increased. The adjustment corresponding to the change in the height can be performed. In addition, when the moving directions of the scanning drive transmitting means to be hooked on the two grooves of the pulley are the same, there is an advantage that one pulley is sufficient.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a scanning device according to the present invention.

FIG. 2 is an enlarged perspective view showing a part of the scanning device.

FIG. 3 is a front view showing an optical arrangement of the scanning device.

FIG. 4A is an exploded perspective view showing an example of a pulley section applied to the scanning device, and FIG. 4B is a front sectional view.

5A is an exploded perspective view showing another example of a pulley portion applied to the scanning device, and FIG. 5B is a front sectional view.

6A is an exploded perspective view showing another example of a pulley portion applied to the scanning device, and FIG. 6B is a front sectional view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive motor 2 drive pulley 3 scanning drive transmission means 4 first pulley 4 ′ second pulley 100 first traveling body 100 a linear motion guide unit 100 b first mirror holding unit 101 second traveling body 101 a linear motion guide unit 4 101 b second Mirror holder

Claims (5)

[Claims] 1. A scanning device for slit-exposing a document to form an image on a photosensitive drum, comprising: a traveling body that is moved by a driving source and scans the surface of the document; Scanning drive transmitting means for moving the traveling body, a linear motion guide portion is provided on one side of the traveling body, and pulleys on which the scanning drive transmitting means are respectively hung on both sides of the traveling body. A scanning device, wherein at least one of the pulley portions on both sides is provided on the traveling body so that the position in the traveling direction can be adjusted. 2. When there are two traveling bodies, and when the peripheral speed of the photosensitive drum is V and the magnification of an image to be formed is m, one traveling body travels at a scanning speed of V / 2m. 2. The scanning device according to claim 1, wherein one of the pulleys provided on both sides of the traveling body is provided on the one traveling body so that the position in the traveling direction can be adjusted. 3. The pulley section provided so as to be adjustable in position in the scanning direction has two pulleys, each of which is attached to a different support shaft, and wherein each of the pulleys is provided with the scanning drive transmitting means. 2. The scanning device according to claim 1, wherein the scanning is performed independently. 4. The pulley portion provided so as to be capable of adjusting the position in the traveling direction has two pulleys, each of which is attached to the same support shaft, and wherein each of the pulleys has the scanning drive transmitting means. 2. The scanning device according to claim 1, wherein the scanning is performed independently. 5. A pulley portion provided so as to be capable of adjusting a position in a traveling direction has a pulley in which two grooves are formed,
2. The scanning apparatus according to claim 1, wherein said scanning drive transmitting means is independently hung on each of said grooves.