JPS6254662A - Aligning holder - Google Patents

Abstract

PURPOSE:To enable the automatic and precise correction of a holder tip with a holder built into a device in an aligning holder for an optical element such as a lens by providing a grinder for polishing the holder tip in close contact therewith. CONSTITUTION:Grinders 3-1 and 3-2 of PVA and the like are fixed to ring- shaped plates 4-1 and 4-2 at the tip of springs 5-1 and 5-2 fixed to the holder securing plates 6-1 and 6-2 which are connected to holder bodies 1-1 and 1-2 with screws 7-1 and 7-2, and are so positioned as to be pressed in an axial direction. When holder tips 1a-1 and 1a-2 are deformed and require correction, a moving mechanism (p) is made to press the grinders 3-1 and 3-2 against said tips 1a-1 and 1a-2, and the holder 1-2 is turned with a rotary mechanism. Then, the holder tips 1a-1 and 1a-2 are polished by the grinders 3-1 and 3-2 in entire contact and said tips 1a-1 and 1a-2 are corrected to be normal to an axial center c.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a so-called bell clamp centering holder that is incorporated into an apparatus for centering and grinding an optical element such as a lens. It has a structure suitable for automatically performing polishing correction processing with high precision while the holder is installed in the device, and can be performed with high precision without significantly interrupting the centering and grinding processing. Regarding the core holder used.

[Conventional technology]

Equipment used for centering and grinding for centering optical elements such as lenses formed by grinding and polishing raw materials or molding with molds generally holds and holds the workpiece to be centered. A so-called bell clamp centering holder is used that takes out the core and holds it during the grinding process.

Generally, in this bell clamp centering holder, the tip of the holder that clamps the workpiece is made of soft material such as copper to avoid clamping scratches on the workpiece made of glass or the like due to the clamping pressure during centering. It is formed using materials.

In this kind of centering holder, the clamping pressure of the holder is high, so when the holder is used for a long period of time, the tip of the holder made of soft material becomes deformed, which may make it impossible to perform highly accurate centering. However, there is a problem in that clamping scratches occur in the workpiece, and therefore, when deformation occurs, it is essential to correct the tip of the holder.

The method for correcting the deformed part at the tip of the holder is as follows:
For example, a manual vapor finish polishing process has traditionally been used.

[Problem that the invention seeks to solve]

However, manual polishing not only requires a skilled technique, but also requires interrupting the operation of the centering device, which is an obstacle in automating the entire centering process. It became. Moreover, there is currently no known method for automatically polishing and correcting the tip of the holder without manual work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a centering holder with a simple structure that allows polishing and repairing the tip of the holder to be performed automatically and accurately in a short period of time while the holder is installed in an apparatus.

Another object of the present invention is to provide a centering holder that enables automation of stable centering processing with high precision, good efficiency, and no clamp damage.

[Means to solve problems]

The above objects can be achieved by the following invention.

That is, in the present invention, each has a circular center on the same axis,
2 circularly facing each other perpendicular to the axis.
It has two holder tips.

In a centering holder for centering a workpiece to be centered and ground by pinching it from the tip of the holder from both opposing surfaces thereof, the centering holder is provided opposite to each of the tips of the holder to sandwich the workpiece. The centering holder is characterized in that a grindstone is attached to the centering holder, which grinds the tip by coming into contact with the tip of the holder on a plane perpendicular to the axis.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 3 show an embodiment of the centering holder of the present invention, and Figure 1 shows a state in which a workpiece such as a lens is held and centered by the centering holder of the present invention. FIG. 2 is a partial cross-sectional view showing a state in which the tip of the holder is being polished and corrected without a workpiece being clamped, and FIG. FIG. 3 is a plan view showing the positional relationship between the holder tip and polishing means in one holder main body.

The centering holder of the present invention basically handles a workpiece that becomes an optical element such as a lens,
A centering holder main body 1-1.1-2 made of a soft material such as brass, which is held from the surface to center the material, and tip portions 1a-1 and 1a-2 of these main bodies that directly press the workpiece. It is constructed with elastic grindstones 3-1 and 3-2 made of PVA (polyvinyl alcohol) or the like for polishing the tips and correcting their shapes when they are deformed in use.

The holder main body of the centering holder of the present invention has two opposing holder tip portions 1a each having a circular center on the axis C and directly sandwiching a workpiece provided in a circular shape perpendicular to the centering axis C. -1, 1a-2, which has a structure known as a so-called bell clamp centering holder, and a workpiece 2 formed as a lens, for example, between the holder tip parts 1a-1, 1a-2, It has the function of sandwiching and centering the two opposing functional surfaces. Therefore, in the holder body portion of the centering holder of the present invention,
In addition to the structure shown in FIG. 1, any structure that functions as a centering holder can be used.

Note that the workpiece is held in the holder by the cutting means (
(not shown) to produce an optical element such as a lens whose outer diameter is cut and centered.

The grindstones 3-1 and 3-2 are provided for polishing and correcting the holder tips 1a-1 and 1a-2 as described above, and in this example, the holder bodies 1-1 and 1-2 Screw? -1 and 7-2 are attached to the holders with springs 5-1 and 5- fixed to the plates 6-1 and 8-2.
2, and is fixed to the annular plates 4-1 and 4-2 provided at the tips of the holders, and is provided in an annular shape perpendicular to the clamping direction, that is, the central axis C direction of the holder, as shown in FIG. , can come into contact with all of the circular holder tip portions 1a-1 and 1a-2.

In the centering holder of the present invention having such a configuration, the holder tip portion can be corrected, for example, as follows.

First, as shown in FIG.
, 1-2, and when the holder tip is deformed, use the moving mechanism P as shown in FIG. Holder bodies 1-1 and 1 provided opposite to each other.
-2 are pressed so that they are in contact with the grindstones 3-1 and 3-2, respectively. In this state, the rotating mechanism (
(not shown) to rotate the holder main body 1-2 and polish the holder tips 1a-1, 1a-2 and the grindstone 3-1, 3-2 until they are in full contact with each other. do. In addition, in order to increase the precision of the finished surface of the holder tip,
It is good to supply a polishing liquid such as water there during polishing.

As described above, the grinding wheels 3-1 and 3-2 are arranged at the holder tip 1a-1 in a plane perpendicular to the holder central axis C.
.

Thereafter, as needed, the workpiece 2 is held between the holders again as shown in FIG. 1, and the centering cutting process is continued.

Please note that the polishing correction of the tip of the holder during the centering process is
You can perform this every time it is determined that deformation has occurred at the holder tip, or you can set the number of processed materials and processing time for which the holder tip will be deformed, and perform the process periodically according to that. Any suitable method may be used depending on the desired centering processing program.

Further, as the mechanism for holding down the grindstone using the spring in the above example, other means such as an air mechanism may be used.

Furthermore, a structure may be adopted in which only the grindstone or the holder main body rotates when the tip of the holder is polished and corrected.

In addition, in the example explained above, the grinding wheels are provided in four continuous rings, but they do not necessarily have to be provided continuously, and the tip of the holder is polished in a circular shape perpendicular to the clamping direction. If possible, it may be provided, for example, in a discontinuous manner with a notch, or only in a predetermined portion.

〔Effect of the invention〕

The centering holder of the present invention has a simple configuration in which a grindstone for polishing and correcting the holder tip is attached at a position opposite to the holder tip.
It has a structure that allows automatic and accurate operation when the holder is assembled into the device. As a result, if the centering holder of the present invention is used, unlike conventional centering holders, there is no need to interrupt the centering and grinding process by manually polishing and correcting the holder tip, and the centering and grinding process can be automatically adjusted. It becomes possible to perform stable and efficient automatic centering processing that incorporates a polishing correction process with high precision, and moreover, it is possible to always obtain processed products without clamping scratches.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing a state in which a workpiece such as a lens is held and centered by the interlining reholder of the present invention, and FIG. FIG. 3 is a partial cross-sectional view showing a state in which a polishing correction process is being performed on the part, and FIG. 3 is a plan view showing the positional relationship between the holder tip and the grindstone in one holder main body. 1-1, 1-2: Holder body 1a-1, 1a-2: Holder tip 2: Workpiece material 3-1.3-2: Grinding wheel 4-1, 4-2: Annular plate member 5-1 , 5-2: Spring 6-1, 8-2: Is the holder mounted on a plate? -1, 7-
2: Screw C: Central axis P: Moving mechanism

Claims (1)

[Claims] 1) A workpiece to be processed by centering grinding, each having a circular center on the same axis, and two circular holder tips provided facing each other perpendicular to the axis. In a centering holder for centering a material by sandwiching it from the tip of the holder from both opposing surfaces, the centering holder is provided facing each of the tips of the holder, and when the workpiece is not sandwiched, the shaft A centering holder characterized in that a grindstone is attached for grinding the tip of the holder by coming into contact with the tip of the holder in a plane perpendicular to the centering holder.