JP2594642Y2 - Tape measure type digital measuring device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tape measure type digital device in which a wire wound around a wire drum in a casing can be drawn out to the outside, and the amount of the wire drawn out is displayed digitally. Related to length measuring equipment.

[0002]

2. Description of the Related Art This type of apparatus is disclosed in Japanese Utility Model Laid-Open No. 60-17990.
4, No. 60-179903 and No. 1-14
As shown in each publication of No. 6108, 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, Wrap the rope around the surface of the reel,
The amount of linear movement of the other end of the rope is converted into the amount of rotation of the reel, the amount of rotation of the reel is converted into a digital amount, and the amount of movement of a moving body such as a machine tool connected to the other end of the rope is measured. doing.

[0003]

In the above conventional apparatus, when the rope is cut, the reel suddenly rotates in the reverse direction by the return rotational force, and the rope is entangled in the casing, making it very difficult to repair. There was a problem of becoming. The purpose of the present invention is to solve the above problems.

[0004]

In order to achieve the above object, the present invention comprises a frame 2, a wire drum 4 rotatably supported by the frame 2 and having a wire 22 wound on a surface thereof;
A wire guide having return means for urging the wire drum 4 in a wire winding return direction, and a guide hole 24 for slidably guiding a portion of the wire 22 pulled out from the wire drum 4 to the outside of the frame 2; Member 20
And a means for converting the rotational movement of the wire drum 4 into an electronic signal and digitally counting and displaying the amount of the wire 22 pulled out from the wire drum 4. Means for detecting the presence or absence of tension of the wire 36 between the guide hole 24 and the wire drum 4 when the detecting means detects that the wire 36 has lost tension.
And braking means for applying a brake to the vehicle.

[0005]

When the wire 22 is cut or sagged,
Wire tension presence detection means detects this state,
The means operates the brake means to move the wire drum 4
To apply a braking force, and stop the rotational force.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a frame fixed to a casing (not shown), on which a wire drum 4 is rotatably supported by a shaft 6. An encoder plate 8 is fixed to the shaft 6, and the rotation of the drum 4 is detected by a sensor 10 as a pulse signal. A shaft body 12 is rotatably supported on the frame 2 in parallel with the shaft 6, and a belt pulley 14 fixed to one end of the shaft body 12 is connected to a belt pulley fixed to the shaft 6 by a transmission belt 16. ing.

A guide rail 18 is provided on the frame 2 in parallel with the shaft 12, and a recess 26 of a wire guide member 20 is slidably fitted therein. A screw hole is provided in the wire guide member 20, and the screw hole is screwed to the screw portion 12 a of the shaft 12. The wire guide member 20 is provided with a guide hole 24 into which a lead portion of a flexible wire 22 wound around the wire drum 4 is inserted, and one end of the wire 22 is inserted into a long hole of the casing. From the outside. The long hole is a guide hole 2 along the guide rail 18.
4 is formed along the entire length of the movement trajectory. One end of the wire 22 is locked to one end of the drum 4.

Reference numeral 50 denotes a spring for a spring plate rotatably supported by the frame 2. A long spring plate 48 deformed in a spiral shape is wound on the reel 50. One end of the spring plate 48 is connected to the reel. It is locked to 50. Reference numeral 42 denotes a shaft rotatably supported by the frame 2,
4 and a spring leaf reel 46 are fixed. The gear 44 meshes with the gear 40 fixed to the shaft 6. The spring plate 48 is wound around the surface of the reel 50 in a state where the spring plate 48 is urged in a direction in which the outer diameter of the reel 50 is reduced. The spring plate 48 is wound on the surface of the reel 46 so as to be wound in a direction opposite to its self-bending direction, and the other end of the spring plate 48 is locked on the surface of the reel 46. I have. The return elasticity of the spring plate 48 acts on the reel 46 in the direction in which the drum 4 winds the wire 22.

Reference numeral 28 denotes a U-shaped brake link.
The central portion is rotatably connected to the wire guide member 20 by the shaft 30.
A wire guide roller 36 is rotatably supported on one side of the hank 28. A brake member 38 made of rubber or the like is fixed to the other end of the link 28 so as to be inclined downward, and the brake member 38 faces the surface of the wire drum 4. The link 28 is moved by a spring 34 having a pin 32 as a fulcrum in a direction in which the roller 36 presses the wire 22 in front of the wire guide member 20 downward, as shown in FIG.
Medium, biased counterclockwise.

Next, the operation of this embodiment will be described. When one end of the wire 22 protruding from the long hole of the casing is pulled, the wire drum 4 is rotated by the pulling force against the return elasticity of the leaf spring 48, and the wire 22 is moved by the wire guide member 20. From the guide hole 24. This amount of withdrawal is determined by the sensor 10 built in the casing.
Is counted by a counter that counts the output of
It is digitally displayed on the display section of the casing. The rotation of the wire drum 4 in the return direction of the wire drum 4
In the state where the tension is applied, the brake link 28 swings clockwise around the shaft 30 to a predetermined angle as shown in FIG.
Are separated from the surface of the wire drum 4. Wire 22
When the wire drum 4 is pulled out or pulled in, the wire drum 4 rotates forward and backward.

The rotation of the wire drum 4 is transmitted to the shaft 12, and the shaft 12 rotates. Due to this rotation, the wire guide member 20 moves along the guide rail 18 following a change in the position at which the wire 22 is pulled out from the wire drum 4. When the wire 22 is cut or loosened, the wire 22 loses its tension and the brake link 28 loses its support, and swings counterclockwise around the shaft 30 as shown in FIG. I do.
As a result, the brake member 38 comes into pressure contact with the surface of the wire drum 4 to apply a braking force to the wire drum 4.

When the wire 22 is pulled from the state in which the wire 22 has become loose, the brake is released by the wire tension force, and the wire 22 returns to the normal state. The spring for urging the brake link 28 is a coil spring 5 as shown in FIG.
2 may be used. In this case, the coil spring 52 is compressed and arranged between the pin 54 projecting from the guide member and one of the links 28.

FIGS. 6 and 7 show another embodiment, in which a tip 38a of a brake member 38 has a tapered wedge shape, and a wire guide member 20 is formed with a projecting portion 20a projecting in the direction of the wire drum 4. FIG. ing. The portion of the protrusion 20a facing the wire drum 4 includes the brake member 3
An inclined surface 20b for forming a V-shaped groove for inserting the tip of the wire 8 between the wire drum 4 and the brake member 38 is formed. Other configurations are shown in FIGS.
Is the same as that of the embodiment shown in FIG.

In the above-described configuration, when the wire 22 is cut or loosened, the wire 22 loses its tension and the brake link 28 loses its support, as shown in FIG. Swings clockwise. As a result, the wire member 4 and the inclined surface 20b of the protrusion 20a
And the braking force is applied to the wire drum 4. In practicing the present invention, the wire 22 is not particularly limited to metal, but may be made of any material as long as it is flexible and does not expand or contract.
Further, the configuration of the wire guide member 20 is not particularly limited to a configuration in which the wire guide member 20 moves along the guide rail 18 with the rotation of the drum 4, and may be a configuration integrally fixed to a frame or a casing.

[0015]

[Effect] As described above, when the wire is cut,
Since the brake acts on the wire drum, rapid rotation of the wire drum can be prevented, and the wire can be prevented from getting entangled. Also, while pulling the wire,
Even if the wire is suddenly released, the wire drum does not suddenly rotate, so that there are effects such as easy handling.

[Brief description of the drawings]

FIG. 1 is an external view of a state where a casing is removed.

FIG. 2 is an external view of a state where a casing is removed.

FIG. 3 is a side view of a main part.

FIG. 4 is a side view of a main part.

FIG. 5 is a side view showing another embodiment of the wire brake mechanism.

FIG. 6 is a side view of a main part showing another embodiment of the wire brake mechanism.

FIG. 7 is a side view of a main part of the above.

[Explanation of symbols]

 2 frame 4 wire drum 6 shaft 8 encoder plate 10 sensor 12 shaft 14 belt pulley 16 transmission belt 18 guide rail 20 wire guide member 22 wire 24 guide hole 26 recess 28 brake link 30 shaft 32 pin 34 spring 36 wire guide roller 38 brake Member 40 Gear 42 Shaft 44 Gear 46 Reel 48 Spring plate 50 Reel 52 Coil spring 54 Pin

Claims (3)

(57) [Scope of request for utility model registration] 1. A frame 2, a wire drum 4 rotatably supported by the frame 2 and having a surface around which a wire 22 is wound, and return means for urging the wire drum 4 in a wire winding and returning direction; A wire guide member 20 having a guide hole 24 for guiding a portion of the wire 22 pulled out from the wire drum 4 to the outside of the frame 2 in a slidable manner; Means for digitally counting and displaying the amount of wire 22 pulled out of the wire drum 4.
Means for detecting the presence or absence of tension of the wire 36 between the guide holes 24 and brake means for applying a brake to the wire drum 4 by friction when the detection means detects that the wire 36 has lost tension. Tape-type digital length measuring instrument equipped with 2. A link 2 which is biased in one direction and rotatably supported by a means for detecting the presence or absence of the tension.
8 and a wire guide roller 36 which is rotatably supported by being pressed against the wire 36 on one side thereof. Whether the link 28 is at a fixed position or displaced from the fixed position in the biasing rotation direction. The tape measure type digital length measuring instrument according to claim 1, wherein the presence or absence of the tension of the wire (36) is detected by the detection. 3. The brake means comprises a brake member 38 attached to the other side of the link 28 so as to face the surface of the wire drum 4, and when the link 28 is displaced from a fixed position in a biasing rotation direction, The brake member (38) presses against the surface of the wire drum (4) to apply a braking force to the wire drum (4).
And a tape measure type digital measuring instrument according to 2.