JP3050367B2 - Winding guide device for binding wires in rebar binding machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved binding wire.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide device that guides a binding wire so that it can be effectively tightened in a reinforcing bar binding machine that unwinds a loop from a guide portion, winds a plurality of times around an intersection of reinforcing bars, and then twists and tightens a part of the loop.

[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. As such a reinforcing bar binding machine, Japanese Utility Model Laid-Open No. 5-3 by the present applicant.
As shown in Japanese Patent Publication No. 494, a wire is wound around a rebar in a loop shape, and then a part of the loop is gripped by a hook and rotated to fix the wire tightly.

According to this bundling method, as shown in FIG. 7 (a), a reinforcing rod is hooked inside a guide arm 20 which bends the wire 2 into a loop shape, and then the wire 2 is fed out to form a loop. The wire loop 2a is wound around, and a part of the wire loop 2a is gripped by the torsion hook 21 and is torsionally rotated to tighten. However, the torsion hook 2
Due to the rotation of 1, the wire loop also receives a force perpendicular to the radial direction and swings sideways, so that a part of the wire 2 is caught at a portion away from the intersection of the reinforcing bar a, and a fastening failure may occur. . Therefore, as shown in FIG. 2B, it is necessary to pull the rebar tying machine forward to make the wire loop 2a in a tension state, and then to bring the wire 2 into close contact with the intersection of the rebar a and then twist it.

Further, as shown in FIG. 1 (c), when the wire is pulled, the torsion portion 22 of the wire rises vertically in the direction perpendicular to the reinforcing bar surface. Since there is a problem that the portion is exposed, it is necessary to bend it as shown by the arrow after twisting. However, there has been a problem in that the bending operation loosens the tension of the wire, thereby lowering the binding force.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a winding guide device for a binding wire in a reinforcing bar binding machine capable of solving the above-mentioned drawbacks and performing simple and reliable binding without requiring special operations such as pulling and bending. Its purpose is to provide.

[0006]

Means for Achieving the Object To achieve the above object, a winding guide device for a binding wire in a rebar binding machine according to the present invention comprises: a wire feeder for sending a wire for binding a rebar outside; A guide that bends the wire fed by the device into a loop shape, a torsion hook that grips a part of the wound wire loop and twists it, and cuts the loop from the original wire A rebar tying machine provided with a cutting device for performing a cutting operation. A first guide arm for guiding and holding inside a wire sent out from the guide portion and looping around in a loop is provided in front of the torsion hook. Are arranged to surround the
Intersecting the intersection of the rebar to bind the second guide arm
And an abutting portion is formed in the vicinity of the torsion hook so as to abut on the intersection of the reinforcing bars at the time of binding.

Preferably, the first guide arm and the second guide arm are provided so as to be openable and closable, and are always urged in a closing direction.

[0008]

According to the first aspect of the present invention, when the crossing portion of the reinforcing bar is inserted between the first guide arm and the second guide arm of the reinforcing bar binding machine to be operated against the abutting portion, The wire feeder is operated to draw out the wire, and the wire is wound around the intersection of the reinforcing bars in a loop by the guide portion to make one revolution. In addition, the wire is the second round, the third round,
The fourth round is similarly looped and wound around the intersection. The wire wound in a loop is placed inside the opposing first guide arm and second guide arm.
You will be guided. And the wire runs around the intersection of the rebar
After three or four rounds, the cutting device is operated to cut the wire in the guide portion, and at the same time, the torsion device is operated to close the torsion hook, to grip a part of the wire loop and torsionally rotate. Thereby, the wire strongly winds the intersection of the rebar. When the torsion hook is pulled out from the wire after the tightening and fixing, the rebar is held in a bound state.

When the wire is torsionally rotated by the torsion hook as described above, the wire loop receives a force which is swung laterally at a right angle in the radial direction. However, the wire loop is held inside the first guide arm and the second guide arm.
Therefore, it does not swing to the side. Moreover, the second gas
The id arm can be opened and closed and is always biased in the closing direction.
The wire is securely held inside both guide arms.
It is. Therefore, even if the rebar binding machine is separated from the rebar intersection and the wire is not pulled and tensioned, the conventional tightening failure does not occur.

Further, since there is no need to pull the wire away from the rebar intersection at the rebar binding machine, the distance between the torsion portion of the wire by the torsion hook and the rebar intersection is always constant, and the torsion portion of the wire is also constant. Since the length of the torsion portion can be shortened and does not rise up with respect to the reinforcing bar surface as in the related art, there is no need to deliberately defeat the torsion portion.

[0011] Further, it is sufficient to insert and operate the intersection of the rebar between the first guide arm and the second guide arm of the rebar binding machine, and this movement is linear, and the insertion is performed until the contact hits the abutment. Is automatically positioned by
Work is very easy.

According to the second aspect of the present invention, the rebar has a large diameter and a small diameter, but the degree of opening between the first guide arm and the second guide arm is free. The wire is automatically kept in the best condition between the first and second guide arms depending on the diameter of the wire.

[0013]

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 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 wound wire 2
A twisting device 5 for grasping a part of the loop and twisting it, and a cutting device 6 for cutting the loop from the wire 2 on the original side. After the wire 2 is sent out through the passage 8 and wound around the reinforcing bar a in a loop, the twisting device 5 grasps a part of the loop with the torsion hook 9 of the twisting device 5 and rotates to bind the reinforcing bar a. With
The loop is cut from the original wire 2 by the cutting device 6. The wire feeding device 3 and the twisting device 5 and the cutting device 6 are operated by a motor (not shown). The basic structure and operation are the same as those described in Japanese Utility Model Application Laid-Open No. 5-3494.

The guide portion 4 for guiding the winding of the wire 2 is continuous with an extension of the feed passage 8 of the binding machine, and is formed so as to protrude from the front end of the reinforcing bar a binding machine main body, and the tip is bent downward. . A guide groove 10 (see FIG. 3) of a size slightly larger than one wire is formed inside. After being led out from the feed passage 8, the wire 2 is continuously bent by the guide groove 10 with a constant curvature, and loops around. Note that the wire cutting device 6 is disposed on the guide unit 4.

Next, the rebar binding machine is provided with a guide device for guiding the loop-shaped wire 2 so as not to swing in a direction perpendicular to its radial direction. The guide device includes a first guide arm 11 provided in front of a torsion hook 9.
And the second guide arm 12 are bifurcated to face each other, and a block-shaped contact portion 13 for contacting the intersection of the reinforcing bar a is formed near the torsion hook 9.

The first guide arm 11 projects from a center of a U-shaped plate-like supporting portion 11a in a plan view and has a U-shaped cross-section guiding groove 11b opening downward at the front. The binding machine body is rotatably supported by support shafts 14 on both sides at the front end. Then, the first guide arm 11 is disposed so as to surround the outside of the guide portion 4,
Inside the guide groove 11b, a wire 2 looped around
Is configured to be guided and held.

The second guide arm 12 also protrudes from the center of a U-shaped plate-like support portion 12a in a plan view and has a U-shaped cross-section guide groove 12b opening forward and upward.
The loop wire 2 is configured to be guided and held inside 2b. The plate-like support portion 12a is rotatably supported by the support shaft 14.

Note that the first guide arm 11 and the second
The guide arm 12 is attached to a common support shaft 14 so as to be openable and closable in a vertical direction, but is always urged in a closing direction by a spring 15. Further, inclined guide portions 16 are formed so that the opposing portions at the distal ends of the first guide arm 11 and the second guide arm 12 are expanded. Thereby, the opening angle between the first guide arm 11 and the second guide arm 12 can be freely adjusted.

The contact portion 13 is for contacting the crossing portion of the reinforcing bar a at the time of binding, and is formed slightly forward of the torsion hook 9 so that the reinforcing bar a itself does not hit the torsion hook 9. In addition, it is preferable that a sensor (not shown) that detects the contact of the reinforcing bar a and activates the reinforcing bar binding machine is disposed in the abutting portion 13.

Next, the mode of use of the rebar tying machine having the above-described configuration will be described.
Inclined guide portion 1 at the tip of first and second guide arms 12
6 so that the intersection of the reinforcing bars a is inserted. When the reinforcing bar a hits the abutment portion 13, the sensor detects this and enters an operable state. Then, when the trigger 7 is pulled, the wire feeder 3 is operated, and the wire 2 wound around the spool 1 is paid out, and is wound around the intersection of the rebar a by the guide portion 4 in a loop. Orbit. Further, the wire 2 is looped around the intersection in the second round, the third round, and the fourth round in the same manner. The wire 2 wound in a loop shape is opposed to the first wire
Of the second guide arm 11 and the guide grooves 11b, 12b of the second guide arm 12. Then, after the wire 2 makes three or four rounds around the intersection of the reinforcing bar a, the feeding device 3 stops, and the cutting device 6 operates to cut the wire 2 in the guide portion 4 and at the same time, as shown in FIG. As described above, the twisting device 5 is operated to close the twisting hook 9, and a part of the loop of the wire 2 is gripped and rotated. Thereby, the wire 2 strongly winds the intersection of the reinforcing bar a. When the rebar binding machine is pulled forward after the fastening, the torsion hook 9 comes out of the wire 2 and opens, and the rebar a is held in a bound state.

When the wire 2 is torsionally rotated by the torsion hook 9 as described above, the wire 2 loop receives a force that is swung laterally at right angles to the radial direction. However, since the wire loop is held in each of the guide grooves 11b and 12b of the first guide arm 11 and the second guide arm 12 as shown in the figure, it does not swing to the side. Therefore, even if the rebar tying machine is separated from the intersection of the rebar a and the wire 2 is not pulled and tensioned, the conventional fastening failure does not occur.

Further, since there is no need to pull the wire 2 away from the intersection of the reinforcing bar a, the distance L between the twisted portion of the wire 2 by the torsion hook 9 and the intersection of the reinforcing bar a is always constant. And it does not grow. Therefore,
As shown in FIG. 5, the twisted portion 17 of the wire 2 may be short,
Since it does not stand up with respect to the reinforcing bar surface as in the related art, there is no need to deliberately defeat the torsion portion.

Although the reinforcing rod a has a large diameter or a small diameter, as shown in FIG. 6, the opening angle between the first guide arm 11 and the second guide arm 12 is free. From the above, according to the diameter of the rebar, the wire 2 is automatically placed in the best state between the first guide arm 11 and the second guide arm 12 (the portion of the wire that is not held in the guide grooves of both guide arms 11 and 12). Is minimized).

[Brief description of the drawings]

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

FIG. 2 is a schematic side view of the binding machine.

FIG. 3 is an enlarged sectional view taken along line XX of FIG. 2;

FIG. 4 is an explanatory view of an operation mode of a torsion hook.

FIG. 5 is a perspective view showing a state in which reinforcing bars are bound;

FIG. 6 is a side view showing a state where the first and second guide arms are opened.

FIGS. 7 (a), (b), and (c) are explanatory views of a binding mode using a conventional reinforcing bar binding machine.

[Explanation of symbols]

 a Reinforcing bar 2 Wire 3 Wire feeder 4 Guide 6 Cutting device 9 Torsion hook 11 First guide arm 12 Second guide arm 13 Abutment

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 21/12 105 B65B 13/02

Claims (2)

(57) [Claims] 1. A wire feeder for feeding a wire for reinforcing bar binding to the outside, a guide for bending the wire fed by the wire feeder into a loop shape, and a loop of the wound wire. In a reinforcing bar binding machine provided with a torsion hook for gripping a part and torsion, and a cutting device for cutting a loop from a wire on the original side, a loop-like shape is sent out from a guide portion in front of the torsion hook. A first guide arm for guiding and holding the wire circling around the inside thereof is arranged so as to surround the outside of the guide portion.
Then, at the intersection of the rebar to bind the second guide arm,
A wire winding in a rebar tying machine, characterized in that the wire is arranged opposite to the opposite side with a buckle, and an abutting portion is formed near the torsion hook for abutting on the intersection of the rebar during binding. Guide device. 2. The wire winding guide device according to claim 1, wherein the first guide arm and the second guide arm are provided so as to be openable and closable, and are constantly biased in a closing direction.