JP2573637Y2 - Stroke detector wire winding device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a wire winding device of a stroke detector used for measuring a long stroke amount in various devices.

[0002]

2. Description of the Related Art For example, when digging a tunnel, it is necessary to know how long (stroke amount) has been dug. As described above, when measuring the length, a stroke detector is used to detect the length by measuring the amount of wire fed out of the drum. In this stroke detector, a wire is wound around a drum having a spiral groove, and the tip of the wire is locked by an excavator or the like, so that the stroke amount is measured by the amount of the wire fed.
In the case of a drum having a fixed diameter, the wire feeding amount can be determined by measuring the rotation angle of the drum with a rotation angle sensor such as an encoder, a resolver, or a synchro. The rotation angle thus obtained is converted into a stroke amount.

A conventional stroke detector will be described with reference to FIG. Reference numeral 1 denotes a drum, which has a cylindrical shape, and has a spiral groove 2 provided on the outer periphery thereof with a precise pitch. The drum 1 rotates around an axis (not shown) provided at the center. The rotational drive is provided by a spring (not shown) coupled to the shaft.

At the end of the groove 2 of the drum 1, a wire 3
The wire 3 is wound around the groove 2 from the locked base end. At the tip of the wire 3, a plate 4 is locked, and the locking portion of the plate 4
It faces the wire outlet 5. The wire 3 shown by a solid line is in the extended state, and the broken line is shown by being wound on the drum 1.

[0005] In the stroke detector having such a configuration, when the stroke amount of the object to be detected is measured by the amount of the wire extended, the wire 3 is extended along with the plate 4. Since the wire 3 is wound in the groove 2 of the drum 1, the wire 3 moves with respect to the drum 1 according to the groove 2 when being unwound and wound up. For example, if the base end of the wire 3 is locked at a position above the groove 2 of the drum 1, the groove 2 is pulled out or wound up.
Is moved upward, and the total movement amount becomes the dimension L.

[0006]

In the stroke detector having such a structure, the conventional one has a large overall outer dimension and a large drum, so that the wire hardly comes off the groove. Therefore, no special consideration was required for this. However, there is a demand for miniaturization of the whole, and it has become necessary to reduce the diameter of the drum in order to respond to this.

In order to reduce the diameter of the drum and to wind a wire of the same length in line with the reduced drum, the width of the drum must be increased by the reduced diameter of the drum. . When the width is increased in this manner, the wire is swung right and left around the portion where the plate is locked, so that when the wire is wound, the wire comes off the alignment winding groove provided on the drum. occured.

The present invention has been made in view of this point, and even if the diameter of the drum is reduced along with the overall miniaturization, the wire winding of the stroke detector does not come off the groove. It is intended to provide a device.

[0009]

According to the present invention, as a means for solving the above-mentioned problem, a wire is wound around a drum provided with a spiral groove, and the stroke amount of an object to be detected is determined by the amount of the wire fed out. In the stroke detector configured to measure, a guide member having a ridge meshing with the groove of the drum and a groove guiding the wire is provided, and the guide member is engaged with the groove of the drum so that the ridge meshes with the groove of the drum. It is configured to be movably supported by a holding tool for holding.

[0010]

According to this structure, the wire is guided in the groove of the guide member, so that the wire is accurately guided in the groove of the drum.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 showing a plan view and FIG. 2 showing a front view. Reference numeral 1 denotes a drum, which has a cylindrical shape, and has a spiral groove 2 provided on the outer periphery thereof with a precise pitch. The drum 1 rotates around a shaft 6 provided at the center. The shaft 6 is supported by support members 7 and 8, and a rotational driving force is applied by a spring (not shown).

Reference numeral 9 denotes a guide member. The guide member 9 will be described below, but its front shape is substantially triangular, and as shown in FIG.
It is fitted between the drum 1 and the holder 10 from above. The holder 10 has a function of holding the guide member 9 so that the ridge 11 meshes with the groove 2 of the drum 1. In the figure, reference numeral 12 denotes an outlet for the wire 3.

FIG. 3 is a front view of the guide member 9, and FIG.
5 is a sectional view taken along the line AA, FIG. 5 is a right side view of FIG. 3, FIG. 6 is a plan view, and FIG. 7 is a bottom view. As is clear from these figures, the guide member 9 is provided with two ridges 11. The width of the ridge 11 is suitable for fitting into the groove 2 of the drum 1 and sliding in the groove 2. The interval between the two ridges 11 is adjusted to the pitch of the groove 2 of the drum 1. A groove 13 for passing the wire 3 is formed in the upper part of the guide member 9 (see FIG. 5).

In the wire winding device of the stroke detector having such a configuration, when winding the wire 3 around the drum 1, the guide member 9 is fitted between the drum 1 and the holder 10 from above. use. In order to wind up the wire 3 with the guide member 9 fitted in this way, the drum 1
Is rotated, the guide member 9 is maintained in its position by the holder 10, and moves in the vertical direction in FIG. 1 according to the rotation of the drum 1 because the ridge 11 meshes with the groove 2 of the drum 1. I do. The wire 3 is inserted into the groove 13 of the guide member 9.
Therefore, it is guided accurately to the groove 2 of the drum 1 and wound up without coming off the groove 2.

[0015]

The present invention is a wire winding device for a stroke detector configured as described above. Therefore, by reducing the diameter of the drum, the width of the drum can be increased, and the wire can be moved from side to side. Even if it is shaken, when the wire is wound, the wire does not fall out of the alignment winding groove provided on the drum.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a front view of that of FIG.

FIG. 3 is a front view of a guide member in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a right side view of the one in FIG. 3;

FIG. 6 is a plan view of the one in FIG. 3;

FIG. 7 is a bottom view of that of FIG.

FIG. 8 is an explanatory diagram showing the relationship between a conventional drum and a wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 2 Groove 3 Wire 6 Shaft 9 Guide member 10 Holder 11 Ridge 12 Wire outlet 13 Groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01B 21/00-21/32 G01B 5/02 G01B 7/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A stroke detector in which a wire is wound around a drum having a spiral groove and a stroke amount of an object is measured by a feeding amount of the wire. A stroke member provided with a guide member having a ridge and a groove for guiding the wire, the guide member being movably supported by a holder for holding the ridge so as to mesh with the groove of the drum. Wire winding device.