JP3013880B2 - Torsion tightening 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 and tightening mechanism for a binding wire in a rebar binding machine which twists a part of the wire after sending the binding wire in a loop and winding it around a reinforcing bar.

[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 torsion hook and rotated to be fixed by torsion. When twisting the wire with the torsion hook, the bundling machine is pulled to apply a tension to the wire and the torsion is tightened, so the tightening force is good, but the torsion portion of the wire extends long in the diameter direction of the wound wire. After the work, it is necessary to lay the torsion portion sideways (so that the torsion portion does not protrude from the concrete surface), and the tightening may be loosened by tilting the torsion portion.

On the other hand, as disclosed in Japanese Patent Application No. Hei 7-79896, there is a method in which the distance between the twisted portion of the wire and the reinforcing steel bar is kept constant, but according to this method, the wire is twisted by twisting. Although the torsion does not extend long just by reducing the loop diameter, on the other hand, no special tension is applied to the wire during the torsion, so the overall binding is uncertain and unstable, and especially the wire In the case of a small diameter, sagging sometimes occurred.

[0004]

An object of the present invention is to provide a rebar tying machine capable of solving the above-mentioned drawbacks and applying a tension to the wire when twisting the wire wound around the rebar, thereby reliably and stably tying the wire. It is an object of the present invention to provide a twisting mechanism for a wire.

[0005]

Means for Achieving the Object In order to achieve the above object, a wire torsion tightening mechanism in a rebar tying machine according to the present invention comprises a wire feeding device for sending a wire for tying a reinforcing bar to the outside, and a wire feeding device for feeding the wire for rebar binding. the wire in a reinforcing bar binding machine comprising a guide portion for attaching a bending tendency to become in a loop, is fed out from the guide portion
A pair of guys holding the looped wire inside
The arm is vertically opposed to the twisting means, and a hook for gripping a part of the wire wound in a loop around the rebar can be opened and closed by rotating the twisting means in the direction in which the wire gripped by the hook is twisted. possible, and only wire wound toward and separably set the rebar was, characterized by being spring loaded so as to be separated from all times the rebar said twisting means.

[0006]

When the binding machine is operated, the wire is fed by the wire feeder into a loop around the rebar with a bending habit formed by the guide portion. The loop-shaped wire is perpendicular to its radial direction. 1 so that it does not swing in the direction of
It is held inside the pair of guide arms, grips a part of the wire with the hook of the torsion means, closes the hook of the torsion means, grips a part of the loop, twists, ties the rebar with the wire, and binds it. I do. At that time, the diameter of the loop of the wire becomes smaller during the twisting of the wire, and the twisted portion of the wire is tensioned, so that the twisting means is pulled toward the rebar side, but the twisting means is spring-biased to the opposite side. Therefore, the free movement of the torsion means is restricted by the spring resistance and the wire is twisted in a state where tension is applied to the torsion portion of the wire, so that the wire is tightly wound without sagging on the rebar.

Therefore, according to the present invention, a stable binding can be reliably realized.

[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 torsion means 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 by the twisting means 5, and the rebar a is wound and bound. The wire feeding device 3 and the twisting means 5 and the cutting device 6 are operated by a motor (not shown). The basic configuration and operation 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. Each guide arm 9, 10 is connected to the binding machine body 8 via two parallel links 11, 12,
The distance between the members is adjusted according to the thickness of the reinforcing bar.

Next, as shown in FIG. 3, the torsion means 5 links the cylindrical body 13 to which a ball screw is applied and the screw shaft 14 with the planetary gear device 15 and biases the screw shaft 14 backward. is there. That is, the screw shaft 14 having the protruding shaft 16 rotatably provided at the front end is inserted into the cylindrical body 13. An inner cylinder 17 is fixed inside the rear part of the cylindrical body 13,
It is screwed into a screw part 18 formed at the front part of the screw shaft 14. A pair of torsion hooks 19 are supported at the front end of the cylindrical body 13 so as to be openable and closable, and a support shaft 21 provided on the protruding shaft 16 is engaged with a concave portion 20 at the base end of each hook 19. Also,
The cylindrical body 13 is provided so as to be movable in the axial direction and rotatable around the axial center, and has an engaging projection 22 formed in the longitudinal direction on the outer surface of the rear end of the cylindrical body 13. I have. On the other hand, an engagement claw 23 that engages with the engagement protrusion 22 is fixed to the binding machine body 8 side. In addition,
The engagement claw 23 is configured to be disengaged from the engagement protrusion 22 by the movement of the cylindrical body 13. Further, the screw shaft 14
Is spline-fitted into the rotary cylinder 24, and a coil spring 25 is disposed between the flange at the rear end of the screw shaft 14 and the front wall of the rotary cylinder 24. (To separate). The rotating cylinder meshes with the planetary gear device 15, and the planetary gear device 15 is linked to the motor.

According to the above configuration, the screw shaft 14 is always urged rearward by the coil spring 25. When the planetary gear device 15 is operated by the driving means, the screw shaft 14 rotates together with the rotating cylinder. At this time, the engagement claw 23 is
The cylindrical body 13 and the inner cylinder 1
7 does not rotate. Therefore, as shown in FIG.
Following the rotation of 4, the cylindrical body 13 and the inner cylinder 17 move forward. Since the protruding shaft 16 relatively moves rearward, the hook 19 closes and grips the wire 2. At the same time, the engaging claw 23 is disengaged from the engaging protrusion 22, so that the cylinder 13
Rotates around the axis with the hook 19 and the wire 2
Twist. By the way, since the wire 2 is wound and tightened during the torsion, the diameter of the loop of the wire 2 becomes smaller. As the loop diameter decreases, the twisted portion of the wire 2 becomes taut. When tightened, the screw shaft 14 is pulled forward (in a direction approaching the rebar a), but as shown in FIG. 5, the screw shaft 14 is urged rearward by the coil spring 25, so the screw shaft 14 is urged by the spring resistance. Since the free movement of the wire 14 is restricted and the wire 2 is torsionally tightened in a state where tension is applied to the torsion portion, the wire 2 is tightly wound without slack on the reinforcing bar a, and a stable binding is surely realized. Can be.

When the reinforcing bar binding machine is pulled forward after the binding, the torsion hook 19 comes out of the wire 2. Thereafter, when the screw shaft 14 is reversed, the screw shaft 14 returns to the original position, the hook 19 opens, and the next binding is prepared.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an outline of a reinforcing bar binding machine according to the present invention.

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

FIG. 3 is a longitudinal sectional view of a torsion means portion.

FIG. 4 is an explanatory diagram of an operation state of a torsion tightening mechanism.

FIG. 5 is an explanatory diagram of an operation state of the torsion tightening mechanism.

[Explanation of symbols]

 a Reinforcing bar 2 Wire 3 Wire feeder 5 Twisting means 19 Hook

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shuichi Ishii 6-6, Hakozakicho, Nihonbashi, Chuo-ku, Tokyo Inside Max Co., Ltd. (56) References JP-A-56-84214 (JP, A) -1777033 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 21/12 105 B25B 25/00 B65B 13/28 B65B 27/10

Claims (1)

(57) [Claims] And 1. A wire feed apparatus for feeding a reinforcing bar binding wire to the outside, in the reinforcing bar binding machine in which a wire fed out and a guide portion for attaching a bending tendency to become in a loop by the wire feed device, the Wire sent from the guide and looped around
A pair of guide arms holding the inside inside are arranged vertically opposite
In addition, a twisting means provided to open and close a hook for gripping a part of the wire wound in a loop around the rebar is rotatable in a direction in which the wire gripped by the hook is twisted, and the wire is wound only close to or separably set reinforcing bars, twisting clamping mechanism of the binding wire in reinforcing bar binding machine, characterized in that the spring-loaded so as to be separated from all times the rebar said twisting means.