JPS5923364B2 - encoder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an encoder that converts rotational motion into a digital signal, and is characterized in that a slitting disc can be easily mounted at an accurate position relative to a rotating body. .

In this type of device, if there is an error in the mounting position of the slit disk with respect to the rotating body, the output of the light receiving element will become unstable.
It becomes impossible to obtain the desired output.

Therefore, high precision is required for attaching the slitting disk to the rotary body, making it difficult to adjust the position of the slitting disk. The present invention aims to eliminate this defect. DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 screw 4 is rotatably supported by this holding body.

Reference numeral 6 denotes a casing, and the inner circumferential surface of the protrusion 8 of this casing has an adjustment screw that is fitted into the outer circumferential surface of the collar portion 10 of the holder 2 and is screwed into a plurality of threaded holes provided through the protrusion 8. 12 to the collar 10.

Reference numeral 14 denotes a plate member fixed to the casing 6, to which a board of the digital display 16 is fixed, and the display 16
The display section is located directly below the window formed in the casing 6.

18 is a tubular rotating body, and a circular protrusion is formed on one side of the collar 18a of the body, and the center of the circle formed by the outer circumferential surface 20 of the protrusion, that is, the fitting surface 20; Rotating body 18
The center of the circle formed by the outer peripheral surfaces 22 and 24 of

The outer circumferential surfaces 22 and 24 of the rotating body 18 are rotatably fitted to the inner circumferential surfaces of bearing members 26 and 28 that are fitted to the inner circumferential wall surface of the casing 6. 30 is a slitting machine made of an elastic synthetic resin plate, and a circular mounting hole 3 is provided in the center of the slitting machine.
2 is formed, and slits 34 are formed at a predetermined pitch on the outer periphery.
is formed.

The center of the circle formed by the lines connecting the center points of the slits 34 exactly coincides with the center of the attachment hole 32. The diameter of the mounting hole 32 is set to be slightly smaller than the diameter of the fitting surface 20. 36 is the slitting machine 30
Six notches are formed at the same depth at predetermined intervals on the inner periphery of the mounting hole 3.
It is formed in the radial direction centered on the center point of No. 2.

Due to the arrangement of the notches 36, the elasticity of the inner circumferential portion of the slitting disk 30 at a position facing the center point of the mounting hole 32 is set to be the same. That is, in the drawing, the elasticity at point A and point B on the inner circumference of the slitting machine 30 is the same. The mounting hole 32 of the slit plate 30 is press-fitted onto the outer peripheral surface of the fitting surface 20 of the rotating body 18. Reference numeral 38 denotes a ring-shaped holding plate, the inner circumferential surface of which fits into the fitting surface 20, and the holding plate 38 is fixed to the side surface of the rotating body flange 18a with screws.

The slitting machine 30 is supported under pressure by one surface of the holding plate 38 and one surface of the flange 18a. 40 is the presser plate 38
A recess is formed on one surface of the holding plate 38 near and along the inner circumference of the holding plate 38.

A collar 42 is fixed to the shaft portion of the feed screw 4, and one end of the collar 42 abuts one end of a thrust ball bearing 44 disposed on the holder 2. A key groove 46 is formed in the inner circumferential surface of the rotating body 18 in the axial direction, and the key groove 46 is slidably fitted into a key 48 provided with a protruding collar 42VC. Reference numeral 50 denotes a nut into which the end of the feed screw 4 is freely screwed, and the side surface of the nut 50 is pressed against the side surface of the collar 42.

52 is a handle detachably fixed to one end of the feed screw 4.

Reference numeral 54 denotes a photodetector mounting base fixed to the inner wall surface of the casing 6 with screws via a spacer 56, and printed circuit boards 58, 60 are fixed to both sides of this.

A pair of holes (not shown) are transparently provided in the substrate 58 and the stand 54, and light receiving elements 62 and 64 are attached to the holes. 6
Reference numeral 6 designates a fixed slit plate attached to the base 54, on which a pair of slit parts 70 and 72 are formed.
72 faces the light receiving elements 62 and 64.

Reference numeral 68 denotes a light emitting element, which is mounted in each of a pair of holes transparently provided in the substrate 60, facing the light receiving elements 62 and 64.

The electronic circuit of this device is integrated into a case, and the case is attached to the plate member 14. Next, the operation of this embodiment will be explained. ...Ndol 5
2 to rotate the feed screw 4, the rotating body 18 rotates along the inner circumferential surfaces of the bearing members 26 and 28, and the slit plate 30 rotates in conjunction with the rotation.

When the slit disk 30 rotates, the light emitted from the light emitting element 68 reaches the light receiving elements 62 and 64 when the slit 34 of the slit disk 30 and the slit of the fixed slit plate 66 match.
When the light is irradiated, the light receiving elements 62 and 64 output a sinusoidal voltage. This sine wave signal is pulsed and arithmetic processed by the integrated circuit in the case, and the display section of the display 16 shows the amount of rotation of the feed screw 4 from the reset position, that is, the amount of feed of the cutter, as a decimal value. Displayed by. The sinusoidal outputs of the light receiving elements 62 and 64 can be obtained by precisely overlapping the slits 34 of the slit plate 30 in parallel with the slits of the fixed slit plate 66. This requires that the loci of movement of each slit 34 of the slit machine 30 be the same. This means that each slit 34
This can be achieved by completely matching the center of the circle formed by connecting the centers of the rotating body 18 with the center of rotation of the rotating body 18. In addition to this device, when attaching the slit disk 30 to the rotating body 18, the mounting hole 32 of the slit disk 30 is press-fitted into the fitting surface 20 of the rotating body 18.

As a result, the center of the circle passing through the center points of the slits 34 of the slit disk 30 can be perfectly aligned with the center of rotation of the rotating body 18. That is, due to the presence of the notch 36,
Since the elasticity of the parts symmetrical to the center point of the mounting hole 32 on the inner circumference of the slit disc 30 is the same, when the slit disc 30 presses the mounting hole 32 into the fitting surface 20, the mounting hole 32 is set on the fitting surface 20 so that its center always coincides with the center of the fitting surface 20. After press-fitting the slitting plate 30 into the surface 20, the holding plate 38 is fitted onto the fitting surface 20, and with the slitting plate 30 sandwiched between the holding plate 38 and the flange 18a, the holding plate 38 is fixed to a rotating body using screws. It is crimped and fixed to the flange 18a of No. 18. With this, the slit plate 30
It is possible to achieve a flatness accuracy of . When the slit disk 30 is press-fitted into the fitting surface 20K, the deformed portion formed on the inner peripheral portion of the slit disk 30 is located within the recess 40 of the holding plate 38. Incidentally, when implementing this embodiment, a recess 4 is formed in the presser plate 38.
0 need not be provided, and the slits 34 of the slit plate 30 and the slits of the fixed slit plates 6,6 may be patterned by printed notice boards or the like. Further, the number, shape, and position of the notches 36 of the slitting machine 30 are not particularly limited to those shown in the drawings. Figure 5 shows the slit plate 74.
A modification of the notch 76 is shown. Since the present invention is constructed as described above, the slitting machine can be easily set in an accurate positional relationship with respect to the rotary body, and there is an advantage that there is no need to perform troublesome fine adjustments.

[Brief explanation of drawings]

The drawings show preferred embodiments of the present invention, in which Fig. 1 is a sectional view, Fig. 2 is a sectional view, Fig. 3 is a front view of the slitting machine, Fig. 4 is a partial sectional view of the same, and Fig. 5 is another sectional view. 6th front view showing the embodiment of
The figure is an explanatory diagram, and FIG. 7 is a sectional view of the main part. 2...Holding body, 4...Feed screw, 6...
...Casing, 14...Plate member, 16
...Digital display, 18... Rotating body, 20... Fitting surface, 26, 28...
Bearing member, 30... Slitting machine, 32...
...Mounting hole, 34...Slit, 36...
...Notch, 38...Press plate, 42...
・Color, 52...Handle, 54...
・Mounting base, 56...Spacer, 58, 60・
...Printed circuit board, 62, 64...Light receiving element, 66...Fixed slit plate, 68...
...Light emitting element.

Claims (1)

[Claims] 1 has a rotating body 18, an annular fitting surface 20 provided on the rotating body 18 side that interlocks with the rotating body, and a mounting hole 32 having a diameter shorter than the outer diameter of the fitting surface 20, an elastic slit plate 3 with holes 32 press-fitted into the fitting surface 20;
0, and light-receiving and light-emitting elements 62, 64, and 68 facing each other with the slit plate 30 in between. An encoder characterized in that a plurality of notches 36 and 76 are provided so that elasticity at opposing positions is the same.