JPH0812041B2 - Rope winding device in tape measure type digital length measuring machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention converts the movement of a rope wound around a reel and pulled out into a rotary movement of an encoder plate, and converts the rotary movement of the encoder plate into a digital pulse signal. A-
The present invention relates to a tape measure type digital length measuring device which is D-converted to measure the movement amount of the rope, and more particularly to a rope winding device in the tape measure type digital length measuring device.

[Conventional technology]

This kind of device is used in the actual development No. 60-179904 and the actual development No. 60-17.
As disclosed in Japanese Patent No. 9903, a reel is rotatably disposed by applying a rotational force in a winding return direction in a casing, and one end of a flexible rope is attached to a surface of the reel, The rope is wound around the surface, the linear movement amount of the other end of the rope is converted into the rotation amount of the reel, the rotation amount of the reel is converted into a digital amount, and a machine tool or the like connected to the other end of the rope is converted. The moving amount of the moving body is measured.

[Problems to be solved by the invention]

When the rope is pulled out from the casing to the maximum extent, when the rope is wound around the surface of the reel by the return rotational force of the reel, the rope may be wound around the reel surface irregularly. That is, the rope may be wound and overlapped on the rope wound on the reel surface. In this case, the winding diameter of the rope is increased, and as a result, the linear movement amount of the other end of the rope and the rotation amount of the reel do not accurately correspond to each other, which causes an error in the measurement of the movement amount of the rope. It will be. It is an object of the present invention to remove the above defects by winding the rope around the reel surface regularly and in parallel when winding the rope around the reel surface.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention attaches a collar member 32 to one side of a reel for reeling and winding the rope so as to project perpendicularly to the surface of the reel,
When the attachment end P of the 36 to the surface of the reel 10 is set to a position adjacent to one side surface of the collar member 32, and when the rope 36 is wound around the surface of the reel 10 by the return rotational force of the reel 10, the rope 36 The starting end of the second lap along the surface of the reel 10 is the winding start end of the rope 36,
An inclined surface 32a is formed on one side surface of the collar member 32 so as to be guided to an adjacent position on the surface of the reel 10.

[Action]

From the state where the rope 36 is fully extended from the reel 10,
When the tension of the rope 36 is released, the rope 36 will
The reel 10 is wound on the surface of the reel 10 by rotation in the winding direction. At this time, the first lap of the rope 36 is the inclined surface of the collar member 32.
The rope 36 is wound around the surface of the reel 10 along 32a, and the end of the first round of the rope 36 is about the same width as the outer diameter of the rope 36.
It is guided by the inclined surface 32a toward the center of the surface, and by this guiding action, the starting end of the second round of the rope 36 is
Is guided to a position adjacent to the start end of the first round of the reel 10 on the surface of the reel 10. Therefore, the second lap of rope 36 is 1 of rope 36
There is no overlap on the lap. If the second lap of the rope 36 is adjacent to the first lap, after the third lap, the tension of the rope 36 regulates it so that it will be located beside the previously wound rope. The coils are wound on the surface of the reel 10 adjacent to the previously wound ropes in parallel.

[Embodiment] The configuration of the present invention will be described in detail below with reference to an embodiment shown in the accompanying drawings.

Reference numeral 2 denotes a casing composed of a box portion 2a and a lid portion 2b, and the lid portion 2b is detachably fixed to the box portion 2a with a screw. A shaft body 4 is fixed to the box portion 2a, and a boss portion of a disk 6 is rotatably supported by the shaft body 4 via a ball bearing. An encoder plate 8 formed of a known slit plate, a reel 10 for ropes, and a reel 12 for spring plates are fixed to the disk 6. Reference numeral 14 denotes a pair of light emitting elements, 16 denotes a pair of light receiving elements, which constitute an optical photodetector, and the light emitting and light receiving elements 14 and 16 are known in the art and fixed to the box portion 2a of the casing 2. Through the fixed slit plate 18, the encoder plate 8 is fixed to the box portion 2a by a bracket so as to face each other. Reference numeral 20 denotes a cover whose outer peripheral portion is fitted to the cylindrical portion formed in the box portion 2a via an oil seal, and the inner diameter portion of the cover 20 is attached to the outer peripheral surface of the boss portion of the disk 6 through the oil seal. It is rotatably fitted. Reference numeral 22 denotes a shaft body fixed to the box portion 2a, on which a spring plate reel 23 is rotatably supported so as to be adjacent to the reel 12 at an appropriate interval. The reel 23 includes a long strip-shaped spring plate deformed in a spiral shape.
24 are wound. The spring plate 24 is urged in a direction in which the outer diameter of the reel 23 is smaller than the outer diameter of the reel 23.
Is wound on the surface of. One end of the spring plate 24 has a tenth
As shown in the figure, it is formed in a T shape. The reel 12
In the peripheral wall 12a of the groove 2 for inserting the wide portion 24a of the T-shaped portion of the spring plate 24 in a direction perpendicular to the circumferential direction thereof.
6 is transparently provided, and the groove 26 allows the spring plate 24 to be attached to the peripheral wall 12a.
Locking surfaces S, S'for locking the wide portion 24a of the. A notch 28 is formed in the peripheral wall 12a adjacent to the groove 26, and the width of the notch 28 is the narrow portion 24 at the tip of the spring plate 24.
The width is substantially the same as that of b. A guide surface 30 is formed adjacent to the cutout portion 28 so as to have a width substantially equal to the width of the narrow portion 24b of the tip end portion of the spring plate 24, and the guide surface 30 is lowered toward the cutout portion 28. The surface is inclined. A concave portion 31 is formed on the back surface of the peripheral wall 12a adjacent to the groove 26, and the wide portion 24a of the spring plate 24 is arranged in the concave portion 31. The midpoint between the wall surface of the recessed portion 31 and the inclined surface of the guide surface 30 is set to have substantially the same height level on a circle centered on the center of the reel 12. By setting in this way, the spring plate
The one end portion of 24 can be locked to the reel peripheral wall 12a in a gently inclined state without being bent extremely. One end of the spring plate 24 is inserted from the groove 26 of the reel peripheral wall 12a to the inside of the peripheral wall 12a, and the engaging surfaces a and b of the wide portion 24a of the spring plate 24 become engaging surfaces S and S'of the peripheral wall 12a. Abutted and locked. In the state where the spring plate 24 is locked to the reel 12, the wide portion 24a of the spring plate 24 contacts the bottom surface of the recessed portion 31 of the peripheral wall 12a, and the narrow portion 24b of the spring plate 24 forms the peripheral wall 1.
It is fitted and abutted on the guide surface 30 of 2a. The reel 12
1 rotates counterclockwise in FIG. 1, the spring plate 24 locked to the reel 12 is unwound from the reel 23,
It is configured to be wound around 12 surfaces. The spring plate 24 is set so as to be wound around the surface of the reel 12 so as to be bent in a direction opposite to the bending direction thereof, and the spring plate 24 is wound in the reverse direction of the reel 12 in the opposite direction. Due to the resilience of bending,
In the figure, the return torque is generated in the clockwise direction. A flange member 32 is fixed to one side surface of the reel 10 with a screw. A hole 34 is formed in the peripheral wall 10a of the reel 10.
The hole 34 is opened in one side surface of the peripheral wall 10a. A guide groove 38 having substantially the same width as the outer diameter of the rope 36 made of a flexible wire is formed in the peripheral wall 10a so as to communicate with the hole 34, and the guide groove 38 is formed on one side surface of the peripheral wall 10a. An opening is formed at one end of the surface of the peripheral wall 10a. The collar member 32
The inner peripheral surface of the reel peripheral wall 10a which projects vertically from the surface of the reel peripheral wall 10a has an inclined surface 32a that gradually changes in the circumferential direction.
Are formed. The inclined surface 32a is formed by the guide groove 38
With the portion facing as a base point (zero degree), the reel 10 gradually projects toward the center of the surface of the peripheral wall 10a along a circumferential direction B (see FIG. 4) opposite to the rope winding rotational direction A (see FIG. 4). The amount of protrusion Δx is set to be maximum at the end point (360 degrees) in contact with the base point. The protrusion amount Δ
The width x is set to be substantially the same as the outer diameter of the rope 36.
A steel ball 37 is fixed to the tip of the rope 36, the ball 37 is housed in the hole 34, and the base point portion of the rope 36 passes through the groove 38 and, as shown in FIG. It is led to one edge of the surface. Box portion 2a of the casing 2
A rope guide hole 40 having a diameter that changes in three steps is formed therein, and a rope guide 42 made of a tubular body made of nylon is fitted into a 7 intermediate diameter portion of the hole 40. Reference numeral 44 denotes a protrusion made of rubber, and a columnar body 46 made of felt is fitted into a large diameter portion of the shaft hole of the protrusion, and a cut portion is formed in the columnar body 46 in the radial direction. The protrusion 44 is fitted and fixed in the large diameter portion of the hole 40 of the box portion 2a, and in this state, the columnar body 46 is in contact with the rope guide 42. Reference numeral 48 denotes a bracket which is detachably fixed to the box portion 2a by a bolt 50, and both side portions of the rubber plate 52 are held by the bracket, and a cut portion is formed in the rubber plate 52. The rope 36 is inserted into the rope guide 42, the cut portion of the cylindrical body 46, and the cut portion of the rubber plate 52, and is guided to the outside of the box portion 2a. The rope 36
A fitting 54 is fixed to the tip of the. The rope 36
When reel is fully extended from reel 10,
The rope 36 between one side edge of the surface of 10 and the rope guide hole 40 is
11 The axis 58 parallel to the central axis 56 of the reel 10 as shown in FIG.
It is set to be substantially right angle to. Reference numeral 60 is a rubber body fixed to the mounting member 54. Reference numeral 62 denotes a substrate fixed to the box portion 2a, on which an electronic circuit is mounted. The box portion 2a is equipped with a display (not shown) that digitally displays the amount of pulling out and pulling in the rope 36.

 Next, the operation of this embodiment will be described.

For example, when this unit is set on a machine tool and the moving length of the movable table of the machine tool is measured, the casing 2a is fixed on the fixed table side of the machine tool, and the rope 36 is stopped against the rope 36 of the rubber plate 52. After unwinding strongly from the reel 10 against the frictional force and setting the instrument on the machine tool, loosen the nut 50, remove the bracket 48 from the casing 2, and remove the rope 36
The stopping force of the cut portion of the rubber plate 56 against the is released. The operator manually turns the manual handle of the machine tool to position the movable table at the origin, and operates the reset switch to reset the counter in the electronic circuit in the casing 2 to zero. Next, when the handle is rotated to move the movable table, the rope 36 is pulled out from the reel 10 in the casing 2 or wound around the reel 10. As a result, the reel 10 rotates forward and backward in accordance with the reciprocal movement of the moving body along the movement path. When the reel 10 rotates forward due to the pulling force of the rope 36, the reel that interlocks with this
12 rotates counterclockwise in FIG. 1, and spring plate 24 reels.
It is wound around the surface of 12 and bent in a direction opposite to the original bending direction of the spring plate 24. When the spring plate 24 is bent on the surface of the reel 12 in the direction opposite to the return direction, the elastic force of the spring plate 24 to return to the original bending direction acts on the reel 12 and the reel 12 rotates clockwise. Rotational torque is generated at.
The clockwise rotation torque of the reel 12 is generated only by the elastic force of the spring plate 24 that tries to return to the original curved direction,
Since this elasticity is always constant within the movement amount measurement range, the return rotation torque of the reel 12 does not change according to the rotation amount of the reel 12. The rotation of the reel 10 causes the disk 6 to rotate. The rotary motion of the disk 6 is converted into a pair of directional pulse signals by the encoder plate 8 and the optical detector. After being shaped, the pulse signal is processed by an electronic circuit in the casing 2, and the moving length of the moving table, that is, the moving amount of the rope 36 in the linear direction is digitally displayed on the display.

Next, details of the operation in which the rope 36 is wound around the reel 10 from the state where the rope 36 is pulled out to the maximum as shown in FIG. 11 will be described with reference to FIG.

The reel mounting end P of the rope 36 is located at the side end of the surface of the reel 10 near the flange member 32 as shown in FIG. 6b. As shown in Fig. 11, pull out the rope 36 from the reel 10 until the entire length of the rope 36 becomes a straight line.
When the rope 36 is gradually loosened from the state where tension is applied to the rope 36, the rope 36 is gradually wound around the surface of the reel 10. After the rope 36 makes one round around the surface of the reel 10, when the rope 36 makes another round around the surface of the reel 10, the rope 36 is adjacent to the first loop loop rope already wound on the surface of the reel 10. When the rope 36 is wound on the surface of the reel 10, the rope 36 is regularly wound on the surface of the reel 10 in parallel in order as shown in FIG. 6c, but as shown in FIG. However, if it is wound on the reel 10 while overlapping on the rope 36 in the first lap, it will be irregularly wound on the surface of the reel 10 after the third lap, and the displacement amount of the rope 36 in the linear direction will be , The amount of rotation of the reel 10 will not correspond accurately. Therefore, in this embodiment, 2
The first lap of the rope 36 in which the inclined surface 32a is wound around the reel 10 is approximately the same as the outer diameter of the rope 36 so that the first lap rope 36 is adjacent to the first lap rope 36 in parallel. Only guide towards the center of reel 10. That is, when the rope 36 of the first lap is wound around the surface of the reel 10 while being in contact with the inclined surface 32a, the inclined surface 32a in contact with the rope 36 is gradually centered on the surface of the reel 10 in accordance with the winding of the rope 36. When the rope is projected in the direction and is wound around the surface of the reel 10 following the protruding surface, the starting end of the second round is guided to the side of the rope 36 on the first round as shown in FIG. 6c. If the rope 36 for the second lap is adjacent to the side of the rope 36 for the first lap, then the wire is regulated by the adjacent ropes and the reel 10 is regularly coiled.
It is rolled up on the surface.

〔effect〕

Since the present invention is configured as described above, there is an effect that the rope can be regularly wound in a parallel coil shape on the surface of the reel for winding and winding the rope, and accurate length measurement data can be obtained.

[Brief description of drawings]

1 is a front view showing the internal structure of the casing, FIG. 2 is a cross-sectional view, FIG. 3 is a side view, FIG. 4 is a front view of the collar member, FIG. 5 is a cross-sectional view taken along the line AA, and FIG. FIGS. A, b, and c are explanatory views, FIG. 7 is an exploded explanatory view of a collar member, FIG. 8 is an enlarged cross-sectional view of a spring plate reel, FIG. 9 is a plan view of the reel, and FIG. 10 is a spring plate. FIG. 11 is a partial plan view of FIG. 2 …… Casing, 4 …… Shaft, 6 …… Disc, 8 …… Encoder plate, 10, 12 …… Reel, 14 …… Light emitting element, 16 …… Light receiving element, 18 …… Fixed slit plate, 20… … Cover, 22 …… Shaft, 24
...... Spring plate, 26 …… Groove, 28 …… Notch, 30 …… Guide surface, 32
...... Crimping member, 32a ...... Sloping surface, 34 ...... Hole, 36 ...... Rope, 38
…… Ball, 40 …… Rope guide hole, 42 …… Rope guide, 4
4 …… Projection body, 46 …… Cylindrical body, 48 …… Bracket, 50 …… Bolt, 52 …… Rubber plate, 54 …… Mounting bracket, 56 …… Center axis line, 58
…… Axis, 60 …… Rubber body, 62 …… Substrate

Claims (1)

[Claims] 1. A reel (10) is rotatably disposed in a casing (2) by applying a rotational force in a winding and returning direction.
One end of a flexible rope 36 is attached to the surface of the reel 10, the rope 36 is wound around the surface of the reel 10, and the linear movement amount of the other end of the rope 36 is converted into the rotation amount of the reel 10. In a tape measure type digital length measuring device adapted to convert the amount of rotation of 10 into a digital amount, a flange member 32 is attached to one side of the reel 10 so as to project perpendicularly to the surface of the reel 10, and The reel of rope 36
When the attachment end P for the surface 10 is set at a position adjacent to one side surface of the collar member 32 and the rope 36 is wound around the surface of the reel 10 by the return rotational force of the reel 10, the reel 10 of the rope 36 is wound. The flange member 32 is arranged so that the starting end of the second lap along the surface is guided to a position adjacent to the winding starting end of the rope 36 on the surface of the reel 10.
A rope winding device characterized in that an inclined surface 32a is formed on one side surface of the rope.