JP2582353Y2 - Guide mechanism of wire rod in binding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a binding mechanism for stabilizing a loop of a wire rod in a binding machine for winding and binding a reinforcing bar or the like arranged vertically and horizontally at a construction site or the like several times in a loop with a metal wire. About.

[0002]

2. Description of the Related Art A tying machine of this kind is mainly used for tying reinforcing bars buried in concrete at a construction site, and has already been disclosed in Japanese Patent Publication No. 59-39027 and Japanese Patent Application No. 4-4.
No. 0686 is known. This winds a metal wire for bundling on a reel arranged at the rear end of the tool body, unwinds the wire, penetrates a wire feed passage formed inside the tool body, and guides the wire forward. The wire is discharged from the tip of a semi-circular guide provided at the front end of the tool body, wound around the material to be wrapped in a loop, and a part of the wire is gripped with a hook and stopped with a twist. .

[0003] When passing through the semi-circular guide, the wire is forcibly bent in accordance with the degree of bending of the guide, and the bent is continuously applied. Although it is formed, it is necessary to wind the wire around the material to be bound at least three or four times in order to obtain a sufficient binding strength. For this reason, the guide portion includes a first guide groove for guiding the first round of the wire,
It is configured by arranging in parallel a second guide groove for guiding the second and subsequent rounds. After the wire is fed from the tip through the first guide groove of the guide portion, it is guided again to the second guide groove of the guide portion, then is fed out from the tip and returns to the second guide groove. .

As shown in FIG. 5, the guide diameter of the wire in the second guide groove 13 is formed larger than the guide diameter of the first guide groove 12. The reason is that even if the wire a is formed in a loop shape by the first guide groove 12, the loop diameter slightly increases due to the restoring force of the wire itself after exiting the first guide groove 12.

However, the second guide groove 1
If the guide diameter of No. 3 is larger than the diameter of the loop r1 in the first round, the guide of the wire rod becomes loose, so that the loops r2, r3, etc. in the second round and thereafter are swung in the second guide groove 13 in the radial direction. In this case, since the wire is discharged from the tool body at a considerable speed, the wire tends to be swung outside the diameter of the first loop as a whole.

After making several rounds around the material to be tied, the wire is cut, and is gripped and twisted by a torsion hook extending forward from the tool body. There was a possibility that the user might not be able to grasp it, resulting in poor binding.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a wire guide mechanism capable of always forming a stable loop and realizing a reliable binding.

[0008]

[Means for Achieving the Object] In order to achieve the above object, the guide mechanism for the wire rod in the binding machine according to the present invention includes:
The metal wire for binding wound on the reel at the rear end of the tool body penetrates the inside of the tool body, is led out forward, and is discharged from the tip of the semi-arc-shaped guide provided at the front end of the tool body. In a binding machine in which the wire is wound around the material to be bound a plurality of times by being formed into a loop and twisted, the guide portion has a first guide groove for guiding the first round of the wire and a second and subsequent guide grooves. A second guide groove for guiding circulation is juxtaposed, and the second guide groove is formed in a substantially U-shaped cross section from the peripheral wall and the side walls on both sides thereof. Forming a first steadying portion for preventing the wire released from the second guide groove from swaying outside the loop of the wire formed by the first guide groove;
At the opening edge of the side wall of the second guide groove, a second steadying portion is formed to prevent the wire in the second guide groove from swinging inside the loop of the wire formed by the first guide groove. Features.

[0009]

According to the above construction, the binding wire is first formed in the guide portion into a loop by the first guide groove in the first round, and then introduced into the second guide groove. When the wire is released from the second guide groove, the wire is guided inward by the first steadying portion. Therefore, the wire material discharged from the second guide groove is prevented from swaying forward of the loop formed by the first guide groove. Further, when the wire is introduced again into the second guide groove, it is guided inward by the second steady rest. Therefore, the second
The wire released from the guide groove is prevented from swinging backward from the loop formed by the first guide groove.

[0010]

FIG. 1 shows a binding machine. The binding machine includes a tool body 1, a reel 2 provided at a rear end thereof, and a tool body 1
And a torsion hook 4 provided at the front end of the semicircular arc. A straight wire feed passage 5, a wire a feed mechanism (not shown), a wire a cutting mechanism (not shown), and a rotation drive mechanism for the torsion hook 4 are provided inside the tool body 1. Have been. A metal wire a for binding is wound around the reel 2.

In the binding machine, the wire a on the reel 2 is led forward by passing through the wire feed passage 5 of the tool body 1 by the feed mechanism, and is further forcibly bent by passing through the guide portion 3. After being released from the tip and wound around the material to be bound 6 in a loop a plurality of times, the material is cut by the cutting mechanism and the torsion hook 4 is rotated by the rotation drive mechanism.
Is used to hold the loop and rotate it to prevent it from twisting. Reference numeral 11 denotes a guide piece for guiding the wire a released from the tip of the guide portion 3 so as to be introduced again to the opposite side of the guide portion 3.

Each of the guide portions 3 is formed in a U-shaped cross section by a peripheral wall and side walls on both sides thereof.
A first guide groove 7 for guiding the first round and a second guide groove 8 for guiding the second and subsequent rounds are provided side by side (see FIG. 2). The first guide groove 7 guides the first winding of the wire a, and the width of the groove is formed narrow enough to accommodate one wire, whereas the second guide groove 8 is This is for guiding the second and subsequent rounds of the wire a once formed in a loop shape, and is formed in a substantially U-shaped cross section from the peripheral wall 8a and the side walls 8b on both sides thereof, and the groove width of the wire a is 4, It is formed to fit five wires. Also, the second
The guide diameter of the guide groove 8, that is, the diameter for guiding the wire a by the peripheral wall surface of the second guide groove 8, is formed to be larger than the guide diameter guided by the peripheral wall surface of the first guide groove 7.

The second guide groove 8 is formed with a first steady rest 9 provided at the tip of the wire release side and a second steady rest 10 provided on the opening side.

The first steady rest 9 is formed by a guide plate 9a bent from the distal end of the peripheral wall 8a of the second guide groove 8 on the wire release side.
Is formed by The distal end extends to a position close to the first guide groove 7, that is, a vicinity of the wire rod loop r1 guided by the first guide groove 7. Therefore, the second
The wire a guided by the guide groove 8 is guided further inward by the first steady portion 9 just before being discharged from the guide groove 8. Therefore, the loop r2 of the wire a released from the second guide groove 8 is prevented from swinging outside the loop r1 formed by the first guide groove 7.

Incidentally, the first steadying portion 9 may have the middle portion of the second guide groove 8 as its starting end.

As described above, when the first plate stopper 9 restricts the loop of the wire a from touching the front, the loop r2 of the second round is reversed as shown in FIG.
Subsequent loops (indicated by dashed lines) swing back radially. Therefore, to prevent this, the second steady rest 1
0 is formed.

The second steady rest 10 is provided with a second guide groove 8.
Guide plate 10 bent at a substantially right angle from the opening edge of side wall 8b
a (see FIGS. 2 and 4). Therefore, as shown in FIG. 3, the wire a guided by the second guide groove 8 is guided by the second steady rest 10. Therefore, the loop r2 (indicated by a two-dot chain line) of the wire a released from the second guide groove 8 forms the first guide groove 7
To prevent it from swaying inside the loop r1 formed.

As shown in FIG. 4, since the inclined surface 10a is formed on the base end side of the second steady rest portion 10, the wire rod a in the second guide groove 8 after the binding is completed. Since the second steady rest 8 removes the wire a from the guide portion 3 smoothly, the second steady rest 8 does not become an obstacle.

[0019]

According to the present invention, the loop of the wire in the second and subsequent rounds is formed by the first and second steadying portions by the loop of the first round wire formed by the first guide groove. Is prevented from oscillating in the radial direction, so that the loop of the wire approximates the loop of the wire in the first revolution guided by the first guide groove over the entire circumference, and the loop of the wire is stabilized. Reliable binding can be realized.

[Brief description of the drawings]

FIG. 1 is a side view of a binding machine shown together with a wire guide mechanism according to the present invention.

FIG. 2 is an enlarged sectional view taken on line XX of FIG. 1;

FIG. 3 is a side view of another example of the first steady rest portion.

FIG. 4 is a bottom view of the guide portion as viewed from below.

FIG. 5 is an explanatory view of a wire rod loop by a conventional guide mechanism.

[Explanation of symbols]

 a Wire 1 Tool body 2 Reel 3 Guide 6 Material to be tied 7 First guide groove 8 Second guide groove 9 First steady rest 10 Second steady rest

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal wire for binding wound around a reel at a rear end of a tool body penetrates through the inside of the tool body and is led out forward, and furthermore, a semicircular guide provided at a front end of the tool body. In a binding machine in which the wire is wound around the material to be bound a plurality of times and twisted by being released from the tip of the portion to form a loop, the guide portion has a first guide for guiding the first round of the wire. A groove and a second guide groove for guiding the second and subsequent rounds are arranged side by side, and the second guide groove is formed in a substantially U-shaped cross section from the peripheral wall and the side walls on both sides thereof, and the wire is discharged from the second guide groove. The first end of the side has a first steadying portion for preventing the wire discharged from the second guide groove from oscillating outside the loop of the wire formed by the first guide groove. In the opening edge of the side wall, the inside of the second guide groove A wire guide mechanism in a binding machine, wherein a second steadying portion is formed to prevent the wire from swaying inside a loop of the wire formed by the first guide groove.