JPH0222187Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a processing jig suitable for mirror-cutting the reflecting surface of a shaft-mounted polygon mirror.

(Prior art) Polygon mirrors are used as important components of scanners that scan laser beams in laser printers, laser recording systems, etc. They have a shaft mounting hole in the center, and the reflective surface is mirror-like based on the end face. Cutting is required, and high precision is required.

(Problem to be solved by the invention) When mounting such a polygon mirror on a shaft, it not only takes a lot of assembly man-hours to prevent the reflecting surface from wobbling with respect to the shaft center and to ensure parallelism with high precision. However, it required extremely advanced technology and had the disadvantage of being extremely expensive.

For this reason, there has been an increasing demand for polygon mirrors with shafts in recent years. In addition, attempts have been made to support both shaft ends of a shaft-mounted polygon mirror and perform mirror cutting, but this has had the drawback of low clamp rigidity near the cutting area, which impairs the quality of the mirror surface.

(Means for Solving the Problem) In view of the above problems, the present invention makes it possible to easily and highly accurately mirror-cut the reflecting surface using an axis reference without impairing the mirror quality of the shaft-mounted polygon mirror. A spherical seat is formed on the upper surface of the jig body placed on a rotary indexing table, and a shaft hole is bored in the center of the spherical seat perpendicular to the rotary indexing table, and the jig body is fitted into the center of the mirror body. The shaft is inserted into the shaft hole, and an end chuck is interposed between the spherical seat and the mirror body, the upper surface of the end chuck is brought into contact with the lower surface of the mirror body, and the lower surface is in sliding contact with the spherical seat. A spherical seat is formed, and an intake/exhaust path is formed in the jig body and the end chuck to mutually attract the spherical seats, the bottom surface of the mirror body, and the top surface of the end chuck, and the intake/exhaust path is connected to a pump. It is.

(Function) When performing mirror cutting using this jig, first insert the shafted polygon mirror 27 into the shaft holes 8 and 9. At this time, if air is supplied and the valve 28 is adjusted, an air lubricant film will be formed between the lower surface 25 of the mirror body and the upper part 11 of the end chuck, and between the spherical seat 24 of the end chuck and the spherical seat 26 of the jig body. In this state, the polygon mirror body is fixedly clamped regardless of the axis by operating the switching valve and inhaling air.

(Example) Next, an example of the present invention will be described with reference to the drawings. A jig stand 1 is fixed to the upper surface of a rotary table 12 of a processing machine, and the upper surface 7 of the jig stand is formed in a plane perpendicular to a rotation axis 28. Further, a jig body 3 is fixed on the jig table with a presser foot 2, and a through hole 22 is drilled in the center of the jig body 3.
A perpendicularity is ensured between and the bottom surface 21. Further, the center line of the through hole is positioned to coincide with the rotation axis 28. Further, a concave spherical seat 26 is formed on the upper surface of the jig main body 3, and an end chuck 13 having a convex spherical seat 24 formed on the lower surface and slidable on the spherical seat 26 is located.

A fitting hole 11 is bored in the center of the polygon mirror main body 10, which is a workpiece, and the shaft 6 is shrink-fitted into the fitting hole to be integrated. Jig body 3
The centering bush 4, which is inserted into the center hole 22 of the
is loaded. Note that the center hole 22 of the jig body can also be used as the shaft hole without using the centering bush.

The outer periphery of the jig main body 3 is closely surrounded by an annular body 18 having a circumferential groove 19 formed on the inner surface. do. In addition, the jig body 3
When indexing and rotating, the outer circumferential surface of the jig body 3 and the inner circumferential surface of the annular body 18 come into sliding contact. One end of the jig main body 3 is opened to the spherical seat 26, and the other end is opened to the annular body 1.
An air supply/exhaust hole 17 opening into the circumferential groove 19 of No. 8 is penetrated. Further, in the end chuck 13 located on the upper surface of the jig main body 3, circumferential grooves 14 and 15 are formed in the upper surface 23 and the lower spherical seat, respectively, and a passage 16 connects both circumferential grooves. Further, the passage 16 is provided with a valve 28 for adjusting air supply and exhaust to the circumferential groove 14. Note that the valve 28 may not be provided if it is not necessary. Further, the lower circumferential groove 15 opening in the spherical seat 26 communicates with the air supply/exhaust hole 17 .

In the shafted polygon mirror 27, the perpendicularity between the axis 28 and the lower surface 25 of the polygon mirror body 10 is generally not ensured. Then, the spherical seat 24 of the end chuck 13 slides, and the upper surface 23 of the end chuck comes into close contact with the lower surface of the polygon mirror 10, so that the shafted polygon mirror is fixed to the jig body by the operation of the pump. There is. In addition to the illustrated embodiment, the spherical seat 26 on the top surface of the jig main body may be a convex spherical surface, and the spherical seat 24 of the end chuck 13 may be a concave spherical surface. It is also possible to eliminate the need for air supply by coating or immersing a self-lubricating substance on either or both surfaces of the spherical seats 24 and 26, the chuck top surface 23, and the mirror body bottom surface 25.

(Effect) Since the end chuck is provided with a spherical centering function that is independent of the shaft support, all you need to do is insert the shaft of the shafted polygon mirror 27, which is the workpiece, into the jig body and supply air. Since axis-based clamping is easily possible and the clamping rigidity in the mirror cutting area is ensured, stable cutting without chatter vibration is possible, and it is possible to provide a shaft-mounted polygon mirror 27 having a highly accurate reflective surface. can.

[Brief explanation of drawings]

The drawing is a sectional view of an embodiment of this invention. 1... Jig stand, 3... Jig body, 8, 9... Shaft hole, 10... Mirror body, 13... End chuck, 17... Supply/exhaust passage, 23... Upper surface of end chuck, 24 , 26... Spherical seat, 25... Lower surface of the polygon mirror body.

Claims (1)

[Claims for Utility Model Registration] (1) A spherical seat is formed on the upper surface of the jig body placed on a rotary indexing table, and a shaft hole is bored in the center of the spherical seat perpendicular to the rotary indexing table. established,
A shaft fitted at the center of the mirror body is inserted into the shaft hole, and an end chuck is interposed between the spherical seat and the mirror body, and the upper surface of the end chuck is brought into contact with the lower surface of the mirror body. , a spherical seat capable of sliding contact with the spherical seat is formed on the lower surface of the end chuck, and an air supply/exhaust passage is provided between the jig body and the end chuck so that the spherical seats and the lower surface of the mirror body and the upper surface of the end chuck can be attracted to each other. form,
A polygon mirror processing jig that connects the intake and exhaust passages to a pump. (2) The polygon mirror processing jig according to claim 1, wherein the spherical seat of the jig body is a concave spherical surface. (3) The polygon mirror processing jig according to claim 1, wherein the spherical seat of the jig member is a convex spherical surface.