JPH09165917A - Swing preventive mechanism of wire terminal section in reinforcement binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the projection of a wire terminal section from covering depth even when a binding machine is separated from a binding wire by holding the terminal section of a cut wire near the place of cutting until the wire is twisted completely. SOLUTION: This binding machine has a mechanism, in which a wire 4 for binding is forwarded so as to be wound around reinforcements in a loop shape, a cutting mechanism 8 cutting the wire 4, and a twisting mechanism, in which a part of the wire 4 wound in the loop shape is gripped and twisted. A holding means 17 holding the terminal section or a section near to the terminal section of the cut wire 4 is mounted near the cutting mechanism 8 when the cutting mechanism 8 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar binding machine for binding reinforcing bars embedded in concrete,
The present invention relates to a mechanism for preventing the wire end wound around a reinforcing bar from being shaken at the wire end portion so as not to exceed the covering thickness.

[0002]

2. Description of the Related Art As a reinforcing bar binding machine of this type,
The one disclosed in Japanese Patent Laid-Open No. 92103 is known. This is to guide the wire from the wire reel on which the binding wire is wound so that it will be wound around the rebar in a loop shape, then send it out, separate it from the wire on the wire reel side, and A part of the wire wound around the wire is grasped and twisted to bind the reinforcing bar, but when the wire is twisted, the tip and end of the wire are in a free state, so the wire is bound. It is easy to shake in various directions with respect to the part. On the other hand, the tip portion of the wire can be adjusted so as to come close to the binding portion by the feed amount of the wire.

[0003]

However, the position of the terminal end of the wire is fixed at the site of the cutting mechanism, and this position is far from the twisting mechanism. Therefore, when pulling the reinforcing bar binding machine away from the binding wire,
As shown in Fig. 3, the end portion 4 of the wire 4 in which the reinforcing bars 6 are bound together
Although a should normally be at the position of the dotted line, it may be caught and shaken by a part of the reinforcing bar binding machine or the reinforcing bar side, and the covering thickness of the concrete 18 may be exceeded. In this case, since the terminal end 4a of the wire is exposed to the outside of the concrete 18, rainwater may invade the concrete from here or may be oxidized and cracked.

The present invention solves the above problems and holds the end portion of the cut wire near the cutting position until the wire is completely twisted, so that the end portion of the wire swings when the binding machine is separated from the binding wire. It is an object of the present invention to provide a swing-out prevention mechanism for a wire end portion of a reinforcing bar binding machine that can prevent the swinging.

[0005]

In order to solve the above-mentioned problems, in the rebar tying machine according to the present invention, the wire end sway prevention mechanism is such that the tying wire is wound around the rebar in a loop shape. In a rebar tying machine equipped with a mechanism for sending out to a wire, a cutting mechanism for cutting a wire, and a twisting mechanism for gripping and twisting a part of a wire wound in a loop, the cutting mechanism is provided near the cutting mechanism. It is characterized in that holding means for holding the terminal end of the cut wire or its vicinity when operating is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral A in FIG. 1 indicates a reinforcing bar binding machine, in which a wire 4 is pulled out from a wire reel 3 into a main body 2 having a grip 1 at its lower part and bent by a bending guide 5 to bind the wire. A known wire feeding mechanism 7 that winds around the reinforcing bar 6 to be wound, a cutting mechanism 8 that cuts the wire 4 when the winding of the wire 4 is finished, and a cutting mechanism 8 that winds around the reinforcing bar 6 when the wire 4 is cut. And a twisting mechanism 9 for twisting with a portion sandwiched therebetween.

The cutting mechanism 8 for the wire 4 in the binding machine A has a fixed blade 8a having a circular through hole 10 for the wire 4 as shown in FIGS. 2 and 3, and the fixed blade 8a. A movable blade 8 that is rotatably fitted to the outside of the wire 4 and has a through hole 11 for the wire 4 that is long in the vertical direction behind the wire 4 in the traveling direction and a slit 12 that acts as a blade on the front side.
b, the movable blade 8b and a lever 14 which rotates about a fulcrum 13 are connected by a connecting rod 15, and an actuating piece 16 that operates together with the twisting mechanism 9 of the wire 4 at the passive end of the lever 14. When the fixed blade 8b is rotated at the fixed blade 8b side end of the connecting rod 15 as shown in FIG. 3 to cut the wire 4, the end of the wire 4 is cut with the lower edge of the slit 12. The holding piece 17 is provided so as to sandwich the side.

In the above structure, the lever 14 is not rotated when the wire 4 is wound around the reinforcing bar 6 in a loop shape by the wire feeding mechanism 7, so that the movable blade 8b fixes the slit 12 thereof as shown in FIG. The wire 4 is allowed to pass freely in line with the through hole 10 of the blade 8a. When the winding of the wire 4 around the reinforcing bar 6 is finished and the twisting hook 9a of the twisting mechanism 9 advances to grip a part of the looped wire as shown in FIG. Since the lever 14 is rotated to pull the connecting rod 15 as shown, the movable blade 8b is rotated to cause the slit 12 to be misaligned with the through hole 10 of the fixed blade 8a to cut the wire 4, and at this time, As shown in FIG. 3, the holding piece 17 attached to the rod 15 is provided with a slit 12 for the movable blade 8b.
The terminal portion 4a of the cut wire 4 is sandwiched between the lower end and the lower edge. Subsequently, when the hook 9a is rotated by the twisting mechanism 9 and a part of the wire 4 is twisted, the terminal end of the wire 4 is held by the holding piece 17. For this reason, when the binding of the wires 4 is completed, the movable blade 8b and the holding piece 17 as shown in FIG.
When the binding machine A is pulled back and the binding machine A is pulled away from the binding wire 4, the terminal end 4a of the wire 4 is retained by the binding machine A to the end, and is finally released by pulling the binding machine A stronger than the holding force. . Therefore, the terminating end 4a of the wire 4 is not lowered and is stabilized at the position shown in FIG. 4 after the binding machine A is separated. Therefore, the concrete 18 always fits within the covering thickness of the concrete 18. In addition, in FIG. 4, 4b is a portion into which the twisting hook is engaged.

By the way, in the above embodiment, the holding piece 17 attached to the movable blade 8b in the cutting mechanism 8 and the connecting rod 15 for rotating the movable blade 8b holds the terminal end of the wire 4.
As shown in FIGS. 5 (a) and 5 (b), a holding member 19 is fixed near the fixed blade 8a, and the holding member 19 is provided with a slit 12 of the movable blade 8b. Wire outlet 2
Holding piece 21 (holding means) arranged above the open end of 0
May be formed. Reference numeral 22 is a wire guide portion.

In this case, the twisting mechanism 9 operates as described above, the operating piece 16 rotates the lever 14 to pull the connecting rod 15 as shown in FIG. 6, and the movable blade 8b rotates and the wire 4 moves. When the outlet port 20 of the movable blade 8b is moved upward after cutting, the terminal portion 4a of the wire 4 also moves along the outlet port 20 of the movable blade, but the portion protruding from the outlet port 20 is the above-mentioned. Since the holding piece 21 is prevented from moving upward, the wire 4 is bent as shown in FIG. Therefore, the terminating end 4a of the wire 4 has the holding member 1
It is held against shaking by 9 and released by pulling strongly on the binding machine.

As described above, since the wire end shake prevention mechanism in the reinforcing bar binding machine according to the present invention holds the cut end of the wire to prevent the wire from being shaken, the wire is bound from the bound wire. Even if the machine is pulled away, the end portion of the wire is surely contained within the concrete covering thickness and can be reliably prevented from going out.

[Brief description of the drawings]

FIG. 1 is an external side view showing a reinforcing bar binding machine that employs a shake prevention mechanism at a wire end portion in the reinforcing bar binding machine according to the present invention.

FIG. 2 is an explanatory view showing a state in which a wire end vibrating prevention mechanism in the reinforcing bar binding machine according to the present invention allows a wire to pass therethrough.

FIG. 3 is an explanatory view showing a state in which the shake preventing mechanism cuts the wire and holds the terminal end of the wire.

FIG. 4 is an explanatory view showing a state where the end portion of the wire, which is prevented from being shaken by the shake preventing mechanism, is accommodated in concrete.

5 (a) and 5 (b) are external side views and cross-sectional views taken along the line AA of another example of the shake prevention mechanism.

FIG. 6 is an operation state explanatory diagram of the shake prevention mechanism.

FIG. 7 is an explanatory view showing a swaying state of reinforcing bars in a conventional binding state.

[Explanation of symbols]

 4 Bundling Wire 4a Wire End Part 7 Wire Feeding Mechanism 8 Wire Cutting Mechanism 9 Wire Twisting Mechanism 17, 21 Wire Holding Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Ishii 6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo Max Co., Ltd.

Claims (1)

[Claims] 1. A mechanism for feeding a bundling wire around a rebar so as to be wound in a loop, a cutting mechanism for cutting the wire, and a part of the wire wound in a loop is gripped and twisted. A reinforcing bar binding machine provided with a twisting mechanism, characterized in that a holding means for holding a terminal end of a wire cut when the cutting mechanism is operated or a vicinity thereof is provided in the vicinity of the cutting mechanism. A mechanism to prevent the end of the wire from swinging in the machine.