JP2817635B2 - 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 rebar tying machine in which a tying wire is fed out from a curved guide arm in a loop, wound around an intersection of reinforcing bars a plurality of times, and then a part of the loop is twisted and tightened. The present invention relates to a guide device for improving the winding of a steel bar 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. Recently, bundling of rebars has been performed by a rebar tying machine. ing. Such a reinforcing bar binding machine is disclosed in Japanese Patent Application No. Hei.
No. 0686 is known. This is done by turning on the main switch, pulling out the trigger at the time of bundling, the wire is sent out, and as shown in FIG. 5, the wire is fed out of the curved portion at the tip of the guide arm 20 and wound around the intersection of the reinforcing bars a and b. After being hung, a part of the loop is grasped by the torsion hook 21 and twisted to rotate for binding.

[0003] The guide arm 20 imparts a bending habit to the fed wire 22, and as shown in FIG. 6, a first guide groove 23 for guiding the wire 22 fed by the wire feeder to bend in a loop shape. And a second guide groove 24 for guiding the second and subsequent loops that have made one round are formed separately, and each is opened inside the curved portion of the guide arm 22.

By the way, in order to form a precise bending habit on a wire fed straight, it is preferable that the width of the first guide groove is slightly larger than the diameter of one wire.
Therefore, if the tip of the wire enters the first guide groove 23 when the wire fed out of the first guide groove makes one turn and then returns to the original bend start portion again, the wire is jammed or a poor bend occurs. Therefore, a partition 25 is formed between the first guide groove 23 and the second guide groove 24.

However, the partition wall 2 is provided between the two guide grooves.
When 5 is formed, there is a strong tendency that the first loop 22a and the other loops 22b are separated from each other, the whole loop is poorly united, and the tightening force on the bound reinforcing bars a and b is not stable. The number of wires is not stable because the loops of each turn easily fall apart and the torsion hook of the torsion device may fail to grip the loop. For this reason, since the torsional torque of the torsion hook 26 cannot be set to a constant value, there is a drawback in that the torsion is cut off or the binding force becomes unstable.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks, and in particular, to wire winding in a rebar tying machine capable of stably tying a wire loop wound out of the leading end of a guide arm. It is an object to provide a guidance device.

[0007]

Means for Achieving the Object To achieve the above object, a wire winding guide device in a rebar tying machine according to the present invention comprises a wire feeder for feeding a wire for tying a rebar, a wire having a bent tip, and A guide arm that guides the wire sent from the feeder in a loop around the rebar intersection, a torsion device that grips a part of the loop of the wound wire and torsionally tightens the wire, A cutting device for cutting the loop from the wire, and the guide arm has a first guide groove for guiding the wire fed by the wire feed device in a loop shape and a second guide groove for guiding the second and subsequent loops. In a reinforcing bar binding machine in which two guide grooves are juxtaposed via a partition and the first guide groove and the second guide groove are opened inside the curve, the first guide groove and the second guide groove facing each other via the partition are provided. The side walls of the guide grooves are made to protrude inside the curve than the partition wall, characterized in that the projecting part is moved close to each other.

[0008]

According to the present invention, when the rebar bundling machine is operated by hanging the tip bending portion of the guide arm on the intersection of the rebars, the wire is fed from the feeder to the tip of the guide arm. Then, the wire is guided in a loop by the first guide groove, and is wound around the intersection of the reinforcing bars. The wire that has made one turn is guided by the second guide groove, and is guided in a loop shape similarly to the first. Further, the third and fourth times are similarly guided to the second guide groove by the guide pieces. Then, the wire of each turn comes out of the opening inside the first guide groove and the second guide groove, and is wound around the intersection of the reinforcing bars.
After the wire makes three or four turns around the rebar, the feeder stops, and at the same time, the torsion device operates to cause the torsion hook to grip a part of the wire loop and rotate. This forces the loop to become smaller and strongly tightens the rebar intersections.
Thereafter, the cutting device operates to cut the wire in the first guide groove of the guide arm.

[0009]

FIG. 1 shows a main part of a rebar tying machine. The tying device comprises a wire feeder 3 for feeding a wire 2 wound around a spool 1 forward, and a rebar a , B, and a torsion device 5 for gripping a part of the loop of the wound wire 2 and torsionally tightening the guide arm 4 for guiding the loop around the intersection of the wire 2.
And a cutting device 6 for cutting the loop from the original wire 2. The wire feeding device 3 and the twisting device 5 and the cutting device 6 are provided on the binding machine main body 7 and are operated by a motor (not shown).

In the above-mentioned rebar tying machine, the main switch is turned on, the trigger 8 is pulled at the time of tying, the wire 2 is sent out from the spool 1 by the wire feeder 3, and the guide arm 4 winds the wire 2 in a loop. After that, a part of the loop is gripped by the torsion device 5 with the hook 9 of the torsion device 5 and rotated to be bound, and the cutting device 6 cuts and breaks the loop from the original wire 2.

The guide arm 4 for guiding the winding of the wire 2 has a distal end curved in an arc shape, and has a base portion on a feed passage 10 for the wire 2 fed by the wire feed device 3.
Connected to As shown in FIGS. 2 and 3, a first guide groove 11a and a second guide groove 11b for guiding the wire 2 are arranged side by side on the curved portion 4a with a partition wall 12 therebetween. I have. Note that a cutting device 6 for the wire 2 is disposed at a boundary between the feed passage 10 and the first guide groove.

The first guide groove 11a is provided in the feed passage 1 for the wire 2.
0, and the groove width is the width of the wire 1
The wire 2 is formed to be slightly larger than the book, and gives a certain bending habit when the wire 2 is fed out from the curved portion 4a of the guide arm 4. Therefore, the curved portion 4a
The wire 2 drawn out from the wire is continuously bent with a constant curvature and loops around.

The second guide groove 11b is a groove for guiding the second and subsequent loops of the wire 2 after the first rotation, and the groove width is wider than the first guide groove 11a. Since the second loop returns slightly larger than the first loop, its diameter is larger than the first guide groove 11a.

Next, the first guide groove 11a and the second guide groove 11
In FIG. 2B, the side walls 13 and 14 facing the partition wall 12 protrude more inwardly than the partition wall 12, and the protruding portions 15 and 16 are close to each other. That is, the first
The protruding portion 15 of the side wall 13 on the side of the guide groove 11a is closer to the second guide groove 11b, and the protruding portion 16 of the side wall 14 on the side of the second guide groove 11b is closer to the first guide groove 11a. Therefore, the first
The entire groove including the guide groove 11a and the second guide groove 11b is formed to have a large depth and a narrow opening side.

It is to be noted that the guide arm 4 is so arranged that the tip of the wire 2 after one rotation is guided by the second guide groove 11b.
The guide piece 17 is formed in a V-shape.

According to the reinforcing bar binding machine having the above configuration, the reinforcing bars a,
When the trigger 8 is pulled by hanging the tip curved portion 4a of the guide arm 4 at the intersection of b, the wire feeder 3 is operated, and the wire 2 wound around the spool 1 is fed out of the guide arm 4. Then, the first guide groove 11a of the guide arm 4
The tip of the wire 2 wound around the intersection of the rebars a and b in a loop around the intersection of the rebars a and b makes a second guide groove 11 by the guide piece 17 of the guide arm 4 during the second round.
b and is guided in a loop like the first. Further, the third and fourth times are similarly guided by the guide piece 17 into the second guide groove 11b. Then, the wire 2 of each turn comes out of the opening formed inside the protruding portions 15, 16 of the side walls 13, 14 of the first guide groove 11a and the second guide groove 11b, and is wound around the intersection of the reinforcing bars a, b. Can be hung. Since the protruding portions 15 and 16 are formed to be close to each other, the first guide groove 11a and the second
Since the loops of the wires coming out of the guide grooves 11b are brought close to each other, the overall unity is improved. Then, after the wire 2 makes three or four rounds around the rebars a and b, the feed device stops, and the cutting device 6 operates to cut the wire 2 in the first guide groove 11a of the guide arm 4, and at the same time, torsion. The device 5 is activated and the torsion hook 9 is connected to the wire 2
Grips a part of the loop and twists to rotate. This allows
The loop formed by the reinforcing bars a and b strongly tightens the intersection of the reinforcing bars a and b.

[0017]

According to the present invention, the first guide groove and the second guide groove are formed when the wire of each round escapes from the opening inside the first guide groove and the second guide groove and is wound around the intersection of the reinforcing bar. Of the first guide groove is closer to the second guide groove, and the side wall of the second guide groove is closer to the first guide groove. I have. For this reason,
Since the loops of the wires coming out of the first guide groove and the second guide groove are brought close to each other, the whole unity is improved and the tightening force on the reinforcing bar is increased.

Further, since the binding state is stabilized, the setting of the tightening torque for the wire loop by the twisting device becomes easy.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of a curved portion of the guide arm.

FIG. 4 is an explanatory diagram of a binding state of reinforcing bars by the above-described reinforcing bar binding machine.

FIG. 5 is a schematic view showing the vicinity of a curved end portion of a guide arm of a conventional reinforcing bar binding machine.

FIG. 6 is an enlarged sectional view taken on line YY of FIG. 5;

FIG. 7 is an explanatory view of a state of binding of reinforcing bars by the above-described conventional reinforcing bar binding machine.

[Explanation of symbols]

 a Rebar b Rebar 2 Wire 3 Feeding device 4 Guide arm 5 Torsion device 6 Cutting device 11a First guide groove 11b Second guide groove 12 Partition wall 13 Side wall 14 Side wall 15 Projecting portion 16 Projecting portion

Claims (1)

(57) [Claims] 1. A wire feeder for feeding a wire for reinforcing bar binding, a guide arm for guiding the wire sent from the wire feeder with its tip curved so as to loop around a rebar intersection. With a torsion device that grips a part of the loop of the wound wire and twists it, and a cutting device that cuts the loop from the original wire,
In the guide arm, a first guide groove for guiding the wire fed by the wire feeder in a loop and a second guide groove for guiding the second and subsequent round loops are juxtaposed via a partition, In a reinforcing bar binding machine in which the first guide groove and the second guide groove are opened inside the curve, the side walls of the first guide groove and the second guide groove facing each other via the partition wall are located inside the curve than the partition wall. Let it protrude,
A winding guide device for a wire in a rebar tying machine, wherein the projecting portions are brought close to each other.