JPS58143946A - Feed gear for grinding machine and the like - Google Patents

Abstract

PURPOSE:To facilitate the feed of an optional twist angle at the time of grinding of a drill by anyone, by a method wherein a plurality of coil springs are provided cylindrically and a twist rotation of a main spindle is led by their twist angle. CONSTITUTION:A plurality of coil springs 22 are arranged cylindrically, both ends of which are secured on twist frames 24a and 24b. A necessary twist angle is given to the coil springs 22 by turning one side or both sides of the twist frames which are secured by screws 26a and 26b. A work 48 is secured on a chuck 50, to which a grinding wheel 52 is pressed and a handle 46 is operated. As the tip of a guide rod 30 is moved along a grooved part of the twisted coil springs 22 by doing as mentioned above, a spiral feed is given to the work 48. A linear feed is given to main spindle 28 by a rack rod 38 and a pinion 44, and the main spindle 28 is turned by the guide rod 30 which is fitted in the grooved part of the above coil springs 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding device for spiral feeding used for grinding drill blades, etc.

Traditionally, the helical feed i) has been produced either entirely by hand or by means of a frame with a defined helix angle. If the work is done by hand, the worker needs to be highly skilled, and the frame! When used, the work is complicated because the frame must be replaced according to the helix angle of the workpiece.

The device of the present invention eliminates all of these inconveniences and allows any helical spiral feed with a single device! r.

The present invention will be explained with reference to drawings showing one embodiment thereof. Reference numeral 10 denotes a main body fixing frame, which is attached to the bellows 12 of the grinding machine. Reference numeral 14 denotes an index tube, which has a cylindrical shape and is rotatably fitted into the main body fixing frame 10. Recesses 16 are formed on the outer periphery of the index tube 14 at positions where the circumference is divided into eight equal parts and at positions where the circumference is divided into six equal parts, and an index E7 pin 18 protruding from the main body fixing frame 10 is fitted into the recess 16. do.

This index tube 14 is fixed by a screw 20 attached to the main body fixing frame 10. A coil spring 22 is in contact with the inner periphery of the index tube 14 and has a cylindrical shape as a whole. 24
a.

24b is a torsion frame fixed to both ends of the coil spring 22 so as to be rotatable around the index tube 14, and screws 26a,
26b so that it can be fixed at any position. An index tube 1 is provided on the outer periphery of the torsion frames 24a and 24b.
A scale (not shown) is provided to indicate the rotation angle with respect to 4, that is, the torsion angle between both screw frames. Reference numeral 28 denotes a main shaft, which is fitted into the inner periphery of a cylinder formed by the coil spring 22 so as to be rotatable in a linear manner. 30 is a guide rod, and the main shaft 28
Fits into a hole 32 extending in the radial direction provided in the intermediate portion,
The main shaft 28 is caused to protrude outward by a spring 34. The center end of the main shaft 28 of the spring 34 is supported by a ball 36.

The protruding end of the guide rod 30 fits into a groove between the coil springs 22. One end of the main shaft 28 is rotatably coupled to a rack shaft 38, and this rack shaft 38 is fitted into a pedestal 40 attached to the bed 12. A rack 42 formed on the rack shaft 38 meshes with a binion 44 attached to a pedestal, and therefore, when a handle 46 attached to the binion 44 is operated, a -
The C-rank shaft 38, that is, the main shaft 38, moves in a straight line. Main shaft 2
A chuck 50 for gripping a workpiece 48 such as a drill blade is attached to the other end of the chuck 8 . 52 is a grindstone for grinding the workpiece.

This device is used as follows. Torsion frame 24m,
24b or both to give a desired torsion angle between both torsion frames, that is, the coil spring 22, and then tighten the screw 26a.
, 26b to fix it. Chuck the workpiece 48 5
0, apply the grindstone 52 to the workpiece 48, and turn the handle 4.
Operate 6. In this way, the tip of the guide rod 30 moves along the groove-shaped portion of the twisted coil spring 22, so that the workpiece 48 is given a spiral feed.

If the workpiece 48 has a plurality of spiral binding parts to be ground, the index tube 14 can be inserted into the main body fixing frame 10 by tightening the screw 20 and pulling out the index pin 18. Rotate and grind each strip.

If normal linear feeding is required, the screw frame may be adjusted to make the twist angle zero.

Therefore, by using the device of the present invention, anyone can easily feed the screw at any angle by adjusting the screw frame, and the device can be used extremely efficiently.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing one embodiment of the present invention, and FIG. 2 is a previous sectional view taken along the line ■--■. 22... Coil spring, 24a, 24b... Screw frame, 28... Main shaft, 30... Guide rod, 42... Rack, 44... Binion, 46... Handle, 48
...Workpiece, 50...Chuck. Patent applicant Yoshito Shiozawa

Claims (1)

[Claims] 1. A large number of coil springs arranged in a cylindrical shape, a screw frame that holds both ends of these coil springs and to which the screw of the cylindrical shaft rotation is applied, and a screw frame that can be linearly rotated coaxially with the cylinder. A main shaft provided, a guide rod protruding from the main shaft and fitting into a groove between the coil springs, a drive unit for linearly moving the main shaft, and a chuck for gripping a workpiece provided at one end of the main shaft. A feeding device for a grinding machine, etc., comprising: