JP3013879B2 - Torsion mechanism of binding wire in rebar binding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisting mechanism for a binding wire in a rebar binding machine in which a binding wire is sent out in a loop, wound around a reinforcing bar, and then a part of the wire is twisted and tightened.

[0002]

2. Description of the Related Art In general, when reinforced concrete is applied to a building or a structure, concrete is laid after bundling rebars crossed vertically and horizontally. ing. Such a reinforcing bar binding machine is disclosed in Japanese Utility Model Application Laid-open No. Hei 5-3 by the present applicant.
As shown in Japanese Patent Publication No. 494, a wire is wound around a reinforcing bar in a loop, and then a part of the loop is gripped with a hook and rotated to twist and fix the reinforcing bar.

The torsion hook is usually located behind the wire loop, and after the wire is wound around the rebar, moves linearly toward the rebar until it can grip the wire, and then closes the hook to grip the wire. After that, rotate and twist.

As described above, since the torsion hook is configured to perform the linear motion, the opening / closing motion, and the rotating motion, the structure is complicated, the cost is increased, the mounting space is increased, and the weight is increased. So the workability was not good either.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire twisting mechanism in a rebar tying machine capable of solving the above-mentioned disadvantages and twisting the wire with a simple structure.

[0006]

Means for Achieving the Object To achieve the above object, a twisting mechanism for a binding wire in a rebar binding machine according to the present invention comprises a wire feeder for sending a wire for rebar binding outside and a wire feeder. In a rebar tying machine having a guide unit that bends the sent wire into a loop so as to bend into a loop, a torsion shaft is provided at a tip of a split groove through which the wire wound in a loop is passed inside,
So that the diameter of the torsion shaft gradually decreases as it approaches the tip
After the wire is wound around the rebar, the torsion shaft is rotated to twist and tighten the wire portion passing through the split groove.

[0007]

The wire fed by the wire feeder and wound around the rebar by the guide in a loop a plurality of times passes through the split groove at the tip of the torsion shaft. After that, when the torsion shaft is rotated, the wire portion passing through the split groove is twisted, so that the twist reduces the wire loop and tightens the reinforcing bar. After the binding, the wire is pulled out of the split groove of the torsion shaft by pulling the binding machine forward. Since the distance between the wire torsion portion and the reinforcing bar due to the split groove is always the same, the torsion portion of the wire does not rise long.

[0008]

1 and 2 show a main part of a reinforcing bar binding machine. The reinforcing bar binding machine includes a wire 2 wound around a spool 1. FIG.
Feeder 3 for feeding the wire 2 forward, a guide 4 for guiding the fed wire 2 so as to be looped around the intersection of the reinforcing bars a, and a twisting device 5 for gripping and twisting the wire 2. And a cutting device 6 for cutting a loop from the wire 2 on the original side. The wire 2 sent out by the wire feeding device 3 is wound around the rebar a in a loop shape and cut by pulling the trigger lever 7. Thereafter, the wire 2 is twisted by gripping and rotating a part of the loop with the twisting device 5, and the reinforcing bar a is wound and bound. The wire feeding device 3 and the twisting device 5 and the cutting device 6 are operated by a motor (not shown). These basic configurations and operations are the same as those described in the above-mentioned publication.

Next, the wire 2 which has been sent out from the guide portion 4 and circulated in a loop is attached to the binding machine main body 8 so that the loop-shaped wire 2 does not swing in a direction perpendicular to its radial direction.
A pair of guide arms 9 and 10 for holding the inside of the arm are vertically opposed to each other.

The guide arms 9, 10 are connected to the binding machine body 8 via two parallel links 11, 12, so that the distance between the guide arms 9, 10 can be adjusted according to the thickness of the reinforcing bar. Have been.

As shown in FIGS. 3 (a) and 3 (b), the torsion device 5 has a torsion shaft 13 protruding from a binding machine main body arranged in the diameter direction of the loop-shaped wire 2 and an axial center. And a split groove 14 is formed at the tip of the torsion shaft 13. Split groove 1
Numeral 4 is formed so that the wire 2 wound in a loop shape can be passed inside.

The diameter of the torsion shaft 13 is formed so as to gradually decrease as it approaches the tip. However, the torsion shaft 13 is not limited to a round bar shape. It may be formed in a tapered square rod shape.

Next, the mode of use of the reinforcing bar tying machine having the above-mentioned construction will be explained. When the trigger lever 7 is pulled and pressed, the wire feeder 3 is actuated to operate the spool 1.
Is wound around the intersection of the rebar a by the guide portion 4 a plurality of times. At this time, the wire 2 is connected to the split groove 14 at the tip of the torsion shaft 13.
(See FIGS. 3 (a) and 3 (b)) and housed in the split groove 14. After that, when the torsion shaft 13 is rotated, FIG.
Since the wire portion passing through the split groove 14 is twisted as shown in FIG. 5, the loop of the wire 2 is reduced by this torsion, and the rebar is tightened as shown in FIG. After the binding, pull the binding machine forward to cut the wire 2 from the split groove 14 of the torsion shaft 13.
Escapes. Since the distance between the wire torsion portion and the rebar by the split groove 14 is always the same, the torsion portion of the wire 2 does not rise long.

The diameter of the torsion shaft 13 is formed so as to gradually decrease as it approaches the tip, so that the torsion shaft 13 can be easily extracted from the wire 2 after binding.

When the wire 2 is torsionally rotated about the rotation axis as described above, the wire 2 loop receives a force that is swung laterally at right angles to the radial direction. However, the wire 2 loop is not swung laterally by the upper and lower guide arms 9 and 10.

[0016]

According to the first aspect of the present invention, since the wire is twisted only by simply rotating without the opening and closing and forward / backward movement as in the conventional twisting means, the shape and structure of the torsion shaft are simplified. It is possible to reduce the weight and size. Further, since the twisted portion of the wire does not rise, it is not necessary to perform the work of lowering the rising portion after binding the reinforcing bars, so that the working speed is improved.

Further , the diameter of the torsion shaft is formed so as to gradually decrease as it approaches the tip, so that the wire after the torsion is easily pulled out and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a reinforcing bar binding machine according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIGS. 3 (a) and 3 (b) are side and front views of the torsion shaft, respectively.

FIGS. 4A and 4B are explanatory diagrams of a state in which a wire is twisted by a torsion axis.

FIG. 5 is an explanatory view of a state in which a wire is twisted by a torsion axis.

[Explanation of symbols]

 a Reinforcing bar 2 Wire 3 Wire feeder 4 Guide 13 Torsional shaft 14 Split groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 21/12 105 B25B 25/00 B65B 13/28 B65B 27/10

Claims (1)

(57) [Claims] 1. A rebar tying machine comprising: a wire feeder for feeding a wire for reinforcing bar binding to the outside; and a guide for bending the wire fed by the wire feeder into a loop shape. A torsion shaft is provided at the end with a split groove through which the wire wound in the shape passes , and the diameter of the torsion shaft approaches the tip.
More formed to become gradually smaller, bundling wire in wire by rotating the torsion axis after being wound around reinforcing bars reinforcing bar binding machine, characterized in that tightening twisting the wire portions passing through the split groove Torsion mechanism.