JPS6240753Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feed amount digital measurement and display device for digitally measuring and displaying the amount of rotation of a feed shaft of a machine tool.

Conventionally, this type of device generally uses a combination of a dial scale and an index.
As a result, there was a problem in that the feed amount of the feed shaft could not be read accurately. The present invention aims to eliminate the above-mentioned defects by digitally measuring and displaying the feed amount of the feed shaft.

Another object of the present invention is to enable easy installation on general machine tools. Furthermore, another object of the present invention is to maintain a constant positional relationship between the encoder stationary part, such as the light emitting/receiving element, and the encoder movable part, such as the slit plate, so that the encoder can operate accurately when installed on a general machine tool. be.

Another object of the present invention is to prevent malfunction of the encoder by preventing axial movement of the feed shaft due to play in the feed shaft support from being transmitted to the encoder movable portion, such as the slit plate.

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a holding body fixed to the main body of the machine tool, and the shaft portion of the feed shaft 4 is rotatably supported by this holding body. In the case of a general machine tool, an index is provided on the flange 6 of the holder 2, a dial is fitted onto the feed shaft 4, and the index on the flange 6 and the scale on the dial are used to move the feed shaft The rotation amount is displayed on a scale. In this example, the dial board is removed and
The casing 8 is used instead of the dial plate, and the feed shaft 4
It fits loosely into the shaft. The inner circumferential surface of a protrusion 10 provided in a tubular shape protruding from the casing 8 is fitted into the outer circumferential surface of the flange portion 6, and the adjustment screws 12 arranged in a plurality of threaded holes provided through the protrusion 10 are tightened. The casing 8 is fixed to the holder 2 by. 1
Reference numeral 4 denotes a plate member fixed to the casing 8, to which a substrate of a digital display 16 is fixed, and the display portion of the display 16 is located directly below the window formed in the casing 8. Reference numeral 18 indicates two light receiving elements (one is not shown) disposed on the member 14, and 20 indicates two light emitting elements (one is not shown) disposed on the plate member fixed to the member 14. ), and the light emitting element 20 and the light receiving element 1
8 are opposed to each other with a predetermined gap therebetween. The light projecting and light receiving elements 20 and 18 constitute an encoder stationary section. 22 is a rotating body, and the pipe portion 2 of this
Vertical surfaces 22b, 22c and a flange portion 22d are formed on the outer peripheral surface of 2a. Annular bearing members 28 and 30 are fitted between the outer peripheral surface of the rotating body 22 and inner peripheral wall surfaces 24 and 26 that form holes in the centers of both side walls of the casing 8.
The end surfaces 32 and 34 of the protruding portion 0 are connected to the casing 8.
is in contact with the wall. One end surface of the bearing member 28 is in contact with the vertical surface 22b of the tube portion 22a, and one end surface of the bearing member 30 is in contact with the vertical surface 22c. The outer circumferential surface of the rotating body 22 is rotatably fitted to the inner circumferential surfaces of the bearing members 28 and 30.
The center of rotation is constant with respect to the casing 8, and the set position of the rotating body 22 in the axial direction is constant with respect to the casing 8. 3
2 is an annular slit plate (encoder movable part) fixed to the flange 22d of the rotating body 22, and the slit plate 32 is connected to the light receiving element 18 and the light emitting element 2.
It is located between 0 and 0. Note that the known fixed slit plate disposed in front of the light receiving element 18 is omitted in the drawing. A collar 3 is attached to the shaft portion of the feed shaft 4.
4 is fixed, and a key 36 is fixed to the outer peripheral surface of the collar 34 in the axial direction. The rotating body tube part 2
A key groove 38 is bored in the axial direction on the inner circumferential surface of 2a, and the key 36 is fitted into the key groove 38. Numerals 40 and 42 are stopper nuts that are screwed into the threaded portion of the end of the feed shaft 4;
The side surface of the rotating body 22 is in light contact with the right end surface of the rotating body 22 in FIG. Reference numeral 44 denotes a case attached to the plate member 14, in which an integrated circuit is built. 46 is a power supply connector, 48 is a reset button, and 50 is a handle detachably fixed to one end of the feed shaft 4.

Next, the operation of this embodiment will be explained.

To set up this device on a general machine tool with a dial display, first remove the handle 50 and nut 4.
0 and 42 from the feed shaft 4, and then remove the dial board from the shaft portion of the feed shaft 4. Next, the collar 34 is fixed to the shaft 4. Next, the tube part 2 of the rotating body 22
2a into the shaft portion of the feed shaft 4, the key groove 38 is fitted into the key 36, and the side surface of the casing 8 is inserted into the holder 2.
It comes into contact with the side end surface of the flange 6. Next, adjust screw 12
is tightened against the screw hole to fix the casing 8 to the collar 6. Next, nuts 40, 42 and handle 50 are installed. In the above configuration, when the handle 50 is rotated to rotate the feed shaft 4, the rotating body 22 rotates along the inner peripheral surfaces of the bearing members 28, 30, and the slit plate 32, that is, the encoder, moves in conjunction with the rotation. The section 32 rotates. Slit plate 32
When the light receiving element 18 rotates, the light receiving element 18 outputs a sine wave voltage having a phase different from each other by 90 degrees, and this sine wave pulse signal is processed by the integrated circuit inside the case 44 and displayed on the display section of the display 16 from the reset position. The amount of rotation of the feed shaft 4, that is, the amount of feed of the blade is displayed as a decimal value. When the feed shaft 4 moves in the axial direction due to backlash, the collar 34 slides in the axial direction against the inner peripheral surface of the rotating body 22, and the axis of the feed shaft 4 is attached to the rotating body 22, that is, the slit plate 32. No directional displacement is transmitted. Therefore, the facing distance between the slit plate 32, the light projecting element 20, and the light receiving element 18 does not change. Note that the present invention is not particularly limited to the structure in which the display is attached to the casing.

Since the present invention is constructed as described above, it can be easily installed on a general machine tool, and the tube part of the rotating body is rotatably attached to the casing so as not to move in the axial direction, and the movable part of the encoder is attached to the rotating body. Since the stationary part of the encoder is installed on the casing side so as to be positioned opposite to the rotation locus of the encoder movable part, the positional relationship between the encoder movable part and the stationary part will change when the casing is set on the machine tool. It is always constant, and even if the feed shaft moves slightly in the axial direction due to play in its support part, the positional relationship of the encoder movable part to the encoder stationary part does not change due to this. This has the advantage that malfunctions of the encoder can be prevented and the amount of rotation of the feed shaft can be accurately measured and displayed digitally.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view, FIG. 2 is a front sectional view, and FIG. 3 is a plan view. 2... Holding body, 4... Feed shaft, 6... Flange, 8
... Casing, 10 ... Protrusion, 12 ... Adjustment screw, 14 ... Plate member, 16 ... Digital display, 18 ... Light receiving element, 20 ... Light projecting element, 22
...Rotating body, 22a...Pipe section, 22b, 22c...
... Vertical surface, 22d ... Flange, 24, 26 ... Wall surface, 28, 30 ... Bearing member, 32 ... Slit plate, 34 ... Collar, 36 ... Key, 38 ... Keyway.

Claims (1)

[Scope of utility model registration request] The tube portion 22a of the rotating body 22 is rotatably attached to the casing 8 so as not to move in the axial direction, the movable part of the encoder is attached to the rotary body 22, and the encoder is stationary so as to be positioned opposite to the rotation locus of the encoder movable part. a protrusion 10 is provided on the casing 8, the protrusion 10 is loosely fitted onto the outer peripheral surface of the flange 6 of the machine tool main body, and an adjustment screw 12 provided on the protrusion 10; is pressed into contact with the flange 6 to attach the casing 8 to the flange 6 of the machine tool so as not to rotate with respect to the flange 6, and also to attach the casing 8 to the flange 6 of the machine tool so as not to rotate relative to the flange 6.
can be fitted onto the feed shaft 4 of a machine tool protruding from the side surface of the collar 6, and is attached to one side of the tube portion 22a of the rotating body 22 and the collar 34 fixed to the feed shaft 4. A key groove 38 is provided along the longitudinal direction of the feed shaft 4, and a key 36 is fixed to the key groove 38 on the other side so as to be slidable along the longitudinal direction. The tube portion 22a of the rotating body 22 and the feed shaft 4 are arranged so that the tube portion 22a of the rotating body 22 and the feed shaft 4 are interlocked in the rotational direction, and the feed shaft 4 is slidable in the axial direction of the tube portion 22a.
and the feed shaft 4, and further includes a display device 16 that digitally displays the amount of rotation of the feed shaft 4 based on the signal from the encoder. Device.