Improved structure of zero-point positioning disk

Abstract

This invention relates to an improved structure for a zero-point positioning disc, designed to simplify its internal mechanism and improve ease of assembly. It comprises: a disc body with an internal accommodating space and several positioning holes; a through hole on the side of the disc body; two crescent-shaped inserts installed within the accommodating space of the disc body, each with two opposing threaded holes of different directions; and a transmission screw with two externally threaded portions of different directions on a rod body. The transmission screw extends through the through hole of the disc body and connects its two externally threaded portions to the corresponding threaded holes of the two crescent-shaped inserts. This allows the transmission screw to be manipulated to drive the two crescent-shaped inserts to move closer together or further apart to engage the positioning pins of a vise holding a workpiece.

Claims

1. An improved zero-point positioning disc structure, comprising: a disc body having an accommodating space therein, and a plurality of positioning holes on the top surface of the disc body, the plurality of positioning holes being interconnected and penetrating the accommodating space; a through hole on one side of the disc body, the through hole also being interconnected with the accommodating space; two crescent-shaped inserts being mounted opposite each other in the accommodating space of the disc body, the outer edges of the two crescent-shaped inserts being laterally inserted into the corresponding positioning holes, and the two crescent-shaped inserts having two interlocking screw holes opposite each other and having different thread directions; and a transmission screw having two external thread portions with different thread directions on a rod body, and the transmission screw extending through the through hole of the disc body, so as to drive the two crescent-shaped inserts to move closer or further apart by operating the transmission screw.

2. The improved zero-point positioning disk structure as described in claim 1, wherein the disk body has a groove on each of its two opposite sides, and the plurality of positioning holes are four in a matrix arrangement; the two external threads of the transmission screw are connected to the two connecting screw holes of the corresponding two crescent-shaped inserts.

3. The improved zero-point positioning disk structure as described in claim 2, wherein the bottom end face of the disk body is provided with a bottom hole and the bottom hole communicates with the receiving space, and the disk body further includes a cover body disposed in the bottom hole.

4. The improved zero-point positioning disc structure as described in claim 3, wherein the cover is fitted with a C-shaped buckle to be attached to the bottom hole.

5. The improved zero-point positioning disk structure as described in claim 2, wherein the cross-section of the outer edge of the two crescent-shaped inserts is a pointed cone shape, so as to facilitate the outer edge to be embedded in the annular groove of the several positioning pins provided by the vise.

6. The improved zero-point positioning disk structure as described in claim 2, wherein the through hole of the disk body is designed as a fisheye hole, and the outer end of the transmission screw is provided with a head to be recessed into the fisheye hole-shaped through hole, and the head is provided with an internal hexagonal groove to facilitate the insertion of a hexagonal wrench.

7. The improved zero-point positioning disk structure as described in claim 2, wherein the transmission screw is a two-piece design and is connected into one piece by a polygonal connecting rod to facilitate driving the two crescent-shaped inserts.

8. The improved zero-point positioning disk structure as described in claim 7, wherein the two-piece structure has two polygonal holes at opposite ends to provide for fitting the polygonal connecting rod, and two fixing screw holes communicating with the two polygonal holes to provide two screws for fixing and positioning the polygonal connecting rod.

9. The improved zero-point positioning disk structure as described in claim 2, wherein two springs are provided between the two crescent-shaped inserts, and each of the two crescent-shaped inserts is provided with a spring positioning hole at each end corresponding to the spring.

10. The improved zero-point positioning disk structure as described in any one of claims 1 to 9, wherein an additional body is provided to provide several zero-point positioning disks placed side by side, horizontally, or obliquely, so as to facilitate the installation of more vises to clamp workpieces and improve the machining efficiency of CNC machine tools.

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