JPH052214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an optical part support device that stably supports, on a guide member, an optical part that moves back and forth to illuminate a document placed on a document table.

<Prior art> Conventionally, in order to reduce the size and increase the speed of the entire copying machine, an optical section consisting of a light source, a reflector, etc. is moved back and forth below a contact glass, which is a fixed document table. For this reason, many devices have been provided in which a document set on a contact glass is scanned and exposed.

In order to reciprocate the optical part in this way, a slide shaft is inserted into one end of a support frame to which the optical part is attached, and a slide member which is a moving member attached to the other end is connected to a slider which is a guide member. A drive wire is wound around a pulley attached to one end of the support frame, and the driving force is transmitted to only one side of the support frame, and the bottom surface of both ends of the support frame has an optical unit attached. At the same time, pulleys are attached to both ends, and the sliders at each end are supported by the sliders, and drive wires are wrapped around each pulley to transmit driving force to both sides of the support frame. It is configured to do this.

<Problems to be Solved by the Invention> With the above configuration, the mounting accuracy of the support frame can be increased by increasing the length of the part through which the slide shaft is inserted. In addition, if the length of the insertion part is shortened, sufficient parallelism cannot be achieved, and the vibration of the support frame at the beginning of movement for image formation continues for a long time, resulting in a problem with the gain. There is a problem in that image distortion becomes noticeable at the leading edge of the image.

In addition, the above-mentioned structure includes one in which three slide members are attached to the end of the support frame to ensure that all the slide members are in contact with the slider, and one in which the end of the support frame is 4
By attaching several slide members and giving flexibility to the support frame itself, all the slide members come into contact with the slider (Japanese Patent Application Laid-open No.
59-154434).

In any of the above configurations, since the parallelism of the support frame can be adjusted by winding both drive wires, it has the advantage that there is no need to increase the accuracy of the support frame itself. Small size and weight reduction can be easily achieved.

However, in the former configuration, one end to which the driving force is transmitted by the drive wire is in contact with and supported on the slider by two slide members, and the other end is in contact with and supported by the slider. Since the slider is in contact with and supported by only one slide member, when the driving force is transmitted by the drive wire, the side that is in contact with and supported by only one slide member The problem is that wear increases, blurring occurs, and the quality of the resulting image deteriorates.

In addition, in the latter configuration, both ends of the support frame are securely abutted and supported on the slider by two slide members, thereby reliably preventing the occurrence of shaking as in the former configuration. However, since the support frame itself is flexible, if the weight balance of the support frame itself with the optical part attached is out of order, the inertia force during movement may be etc. will be different, and screws or the like will occur in the support frame itself due to the above-mentioned imbalance of weight, etc., causing deviation of the optical axis, resulting in a problem that the quality of the obtained image will deteriorate.

Furthermore, in a predetermined range on the terminal end side in the starting direction determined by the attachment state of the feeder wire, the radius of curvature of the feeder wire for supplying power to the light source becomes smaller, causing the pair of wires that should be in contact with the top surface of the slider to become smaller. There is a problem in that a force is applied in a direction that causes one of the slide members to lift off from the slider. That is, when the above-mentioned condition occurs, the quality of the obtained image deteriorates due to blurring and the like.

This invention was made in view of the above-mentioned problems, and it is possible to reliably move the slide members, which are the four moving members attached to the support frame, regardless of the accuracy of the support frame itself and the size of the radius of curvature of the feeder line. It is an object of the present invention to provide an optical part support device that can be brought into contact with the upper surface of a slider, which is a pair of slide members, and can improve the quality of an obtained image.

<Means for solving the problem> A pair of moving members is attached to each end of a support frame to which an optical part that moves back and forth to illuminate a document placed on a document table is attached. The attached end member is connected to the support frame main body so as to be rotatable within a plane that includes the guide member that supports the moving member, and the feeder wire that applies voltage to the light source is connected to the support frame main body at one end. The folded part of the feeder wire is placed in parallel with the moving direction of the support frame, fixed to the support frame, and folded back at a predetermined part so as to follow the reciprocating movement of the support frame. Attaching a rotational biasing member for rotationally biasing the end member in a direction that suppresses rotation of the end member due to restoring force, and further installing a drive transmission member to transmit the driving force to the support frame main body, Each pair of moving members is supported by a corresponding guide member.

<Function> With the above configuration, the parallelism of the support frame can be adjusted by adjusting the mounting state of both drive transmission members, and the parallelism of the support frame can be adjusted by rotating the end member with respect to the main body of the support frame. , the relative positional relationship between each pair of moving members is adjusted, and the rotational biasing member prevents one of the moving members on one side from lifting off from the slide member when the restoring force of the feeder wire is applied. The moving member can be brought into contact with the upper surface of the sliding member, and the quality of the obtained image can be improved.

<Examples> Hereinafter, examples will be described in detail with reference to additional drawings showing examples.

FIG. 4 is a schematic diagram showing the internal structure of a copying machine to which the present invention is applied.

Reference numeral 1 denotes a main body of the copying machine, the interior of which is divided into an upper chamber 12 and a lower chamber 13 by a partition plate 11, an optical system 2 for scanning and exposing a document D is provided in the upper chamber 12, and an optical system 2 for scanning and exposing the original D is provided in the lower chamber 13. , a copy processing section 4 that forms a copy image on copy paper P, and a copy paper transport section 8 are provided.

Here, the optical system 2 includes a light source 21 composed of a light emitter 31, a main reflector 32, and a sub-reflector 33, plane reflectors 22, 23, 24, and a lens 2.
5, and a parallel reflecting mirror 26, and by moving the light source 21 and the plane reflecting mirrors 22, 23, 24 in the direction shown by arrow A, it is possible to scan and expose the original D on the contact glass 14, which is an original platen. (See also Figure 3). Then, the light source 21 and the plane reflecting mirror 22 move integrally,
The plane reflecting mirrors 23 and 24 also move together, and the moving speed of the former is set to be twice that of the latter.In the following explanation, the light source 2
1, and the plane reflecting mirrors 22, 23, and 24 are collectively referred to as an optical section 2'.

In FIG. 3, 27 is a feeder line for supplying power to the light source 21, and is arranged in parallel with the moving direction of the optical section 2'. One end of this feeder wire 27 is fixed to the side surface of the support frame main body 51 on the home position side, which will be described later.
After being guided through the lower part of the support frame main body 51 to the vicinity of the exposure end position, it is bent and folded back, and the other end is guided to a power supply section (not shown) provided on the home position side. ing.

Further, as the copy paper conveyance section 8, a paper feed roller 8
1. It has a paper feed path 83, a conveyance roller 85, a registration roller 86, a conveyance/heat fixing roller 88, and an ejection roller 89, and by driving the paper feed roller, one sheet of copy paper P is delivered from the paper feed cassette 16. The structure is such that the toner image is taken out, guided to the copy processing section 4, where the toner image is transferred, heated and fixed by the heat fixing roller 88, and then discharged onto the pedestal 18. The present invention is not limited to this configuration, and it is also possible to use a copy paper transport section having other conventionally known configurations, such as a configuration in which the paper feed side and the discharge side are on the same side. Further, the copying processing section 4 includes a charging charger 42, a blank lamp B, a developing device 43, a transfer charger 44, a separation member 45,
and a cleaner 46 are arranged in this order, and a document image is formed on the outer surface of the photoreceptor drum 41 which is uniformly charged by the charging charger 42 to form an electrostatic latent image. After the static charge on the unformed peripheral portion is removed by the blank lamp B, the toner image is visualized by the developing device 43,
The toner image is transferred to the copy paper P by the transfer charger 44.
Although the configuration is such that the remaining toner is collected by the cleaner 46, the present invention is not limited to this configuration. For example, copying with other conventionally known configurations, such as one using a belt-shaped photoreceptor, is possible. A processing section can also be used.

FIG. 1 is an exploded perspective view of the main parts of the support frame 5 to which the light source 21 and the reflector 22 are attached, and FIG. 2 is a partially cutaway side view showing the main parts. 21, and a slide member 53, which is a pair of movable members, and a drive wire connecting portion 54, to which the reflecting mirror 22 is attached and at a predetermined position of the end member 52, which is rotatably connected to the support frame main body portion 51. is installed.

To explain in more detail, the support frame main body 5
1 has a reflector mounting portion 55 formed by bending both ends of a single flat plate at a right angle, and an end member mounting portion 56 formed by bending the lower end of the single flat plate upward at a right angle. There is. The end member 52 also has a hole 58 into which a shaft 57 attached to a predetermined position of the end member attachment portion 56 is loosely inserted, and a bolt 60 is attached to the shaft 57 to prevent the bearing 59 from falling off. There is. Further, a hole 62 into which the shaft 57 is loosely inserted is formed in a predetermined position of the plate member 61 located between the end member 52 and the end member mounting portion 57, and the end member is provided at the end on the home position side. 52
A spring member 63 is formed that presses the support frame body 51 downward, and an engagement member 64 that contacts the lower surface of the support frame main body 51 to prevent rotation is formed. That is, the spring member 63 and the plate member 61 on which the engaging member 64 is formed constitute a rotation urging member. Therefore, the slide member 53 comes into contact with the upper surface of the slider 65, which is a slide member attached to the copying machine main body 1. Further, the drive wire connecting portion 54 is immovably connected to a predetermined position of a drive wire 66, which is a drive transmission member, by being compressed with a screw.

In the optical part support device having the above configuration, the end member 52 is rotatably attached to the support frame main body 51, so that the slide member 53 is reliably attached to the slider 65.
It is possible to secure a state in which it comes into contact with the upper surface of.
Therefore, it is possible to suppress the deterioration in the quality of the copied image caused by the blurring of the leading edge and the like.

To explain in more detail, when the support frame main body 51 moves to a position close to the terminal end in the exposure direction and the radius of curvature of the feeder line 27 becomes small, and a force due to the restoring force of the feeder line 27 is applied, the support A force is applied in the direction of rotating the frame main body 51 around the center of gravity, but the end member 5
Since a rotation biasing force is applied to the slider 2 by the spring member 63, the slide member 53 can be reliably held in a state in which it is in contact with the upper surface of the slider 65.

Therefore, for copy image formation, the optical section 2'
Even when the image forming apparatus is moved forward and backward, it is possible to reliably prevent blurring and obtain high-quality copied images.

In the above, one end of the feeder wire 27 is fixed to the side surface of the support frame main body 51 on the home position side. If the feeder wire 27 is fixed to the side surface of the feeder wire 27, the restoring force of the feeder wire 27 will act in the opposite direction, so by forming the spring member 63 at the end of the feeder wire 27 on the side away from the home position, shaking can be prevented as in the above embodiment. This can be reliably prevented and high quality copied images can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, it is possible to attach a spring member having a shape different from that of the above-mentioned embodiments, or to attach a spring member at a position different from the attachment position of the end member 52. In addition, various other design changes can be made without changing the gist of the invention.

<Effects> As described above, the present invention allows all pairs of moving members attached to both ends of the support frame to which the optical section is attached to come into contact with the upper surface of the guide member, thereby eliminating any vibration in the optical section. It has the unique effect of being able to scan a document without causing any interference and obtain high-quality images.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main part of the support frame, FIG. 2 is a partially cutaway side view of the main part, FIG. 3 is an enlarged perspective view of the optical section, and FIG. 4 is a schematic diagram showing the internal mechanism of the copying machine. 5...Support frame, 14...Contact glass, 2
1... A light source forming part of the optical section, 22, 2
3, 24...Reflector forming part of the optical section, 5
1... Support frame main body part, 52... End member, 53...
Slide member, 63... Spring member, 65... Slider, 66... Drive wire.

Claims (1)

[Claims] 1. Attach a pair of moving members to each end of a support frame to which an optical part that moves back and forth to illuminate a document placed on a document table is attached, and connect the end member to which one pair of moving members is attached to the supporting frame. A feeder wire that is rotatably connected to the support frame main body within a plane including the supported guide member and that applies voltage to the light source is fixed at one end to the support frame main body, and The feeder wire is folded back at a predetermined portion so that it can follow the reciprocating movement of the feeder wire, and is arranged in parallel with the moving direction of the support frame, and the end member is A rotation biasing member is attached to rotationally bias the end member in a direction to suppress the movement, and a drive transmission member is attached to transmit the driving force to the support frame main body, and each of the pair of moving members is An optical part support device characterized in that it is supported by a corresponding guide member.