JP2003054511A - Strapping wire feed mechanism for reinforcing bar strapping machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability in feeding a strapping wire of a reinforcing bar strapping machine. SOLUTION: Two driving gears 8 and 9 with a V-groove are disposed on a strapping wire feed path, with which follower gears 10 and 11 with a V-groove are engaged, respectively. The two follower gears 10 and 11 are mounted on a single gear holder 15, which is mounted on a base plate so that it can swing and move fore and aft. A lever 18 equipped with a spring 20 is used to push the gear holder 15 to bring the two follower gears 10 and 11 into elastic contact with the driving gears 8 and 9. Even if the follower gear 10 on an upstream comes away from the driving gear 8 due to a bend of the strapping wire, since the follower gear 11 on a downstream engages with the driving gear 9, feeding is not suspended nor gets unstable. Thus, a feeding amount of the strapping wire can be controlled to be constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding wire feed mechanism for a reinforcing bar binding machine, and more particularly to a binding wire feed mechanism for a reinforcing bar binding machine in which the stability of the binding wire feed is improved.

[0002]

2. Description of the Related Art A conventional binding wire feeding mechanism for a reinforcing bar binding machine is
A V-groove driven gear driven by a feed motor is meshed with a V-groove driven gear, a V-groove driven gear is attached to one end of a lever, and a V-groove driven gear is attached to the V-groove by a spring interposed in the lever. It makes elastic contact with the drive gear. If a binding wire such as a wire is passed through the V-grooves of the two V-grooved gears, the binding wire is sandwiched by a pair of V-grooved gears that mesh with each other, and the binding motor is rotated to rotate the binding wire to the nose of the reinforcing bar binding machine. Sent to.

[0003]

In a binding wire feeding mechanism of a conventional reinforcing bar binding machine in which a driven gear with V groove is elastically contacted by a spring to a drive gear with V groove, a binding wire wound around a binding wire reel is used. When the straightness of the line is poor and the left and right deviations with respect to the traveling direction are large, the V-groove driven gear is pushed laterally by the binding line and is disengaged from the V-groove drive gear, causing the binding line to move. Poor feeding may occur. If the binding wire of the specified length is not sent, binding will be defective in the twisting process and the binding work will have to be performed again.
Waste of the binding wire also occurs. Therefore, there is a technical problem to be solved in order to improve the stability of the binding wire feeding and prevent the occurrence of the feeding failure, and an object of the present invention is to solve the above problems.

[0004]

SUMMARY OF THE INVENTION The present invention is proposed to achieve the above-mentioned object, and includes a V-groove drive gear and a V-groove driven gear having V-grooves formed in the circumferential direction on the outer peripheral surface thereof. A binding wire feed mechanism of a meshed reinforcing bar binding machine, wherein a driven gear with a V groove is elastically contacted with a drive gear with a V groove by a spring,
In a binding wire feeding mechanism of a reinforcing bar binding machine that feeds a binding wire by sandwiching the binding wire between the V groove of the grooved drive gear and the V groove driven gear, a plurality of V grooved drive gears are arranged along the path of the binding wire, A binding wire feeding mechanism for a reinforcing bar binding machine, characterized in that a driven gear with a V groove is elastically contacted with each of a plurality of drive gears with a V groove by a spring.

Further, a plurality of V-groove drive gears are arranged along the path of the binding line, and a plurality of V-groove driven gears are attached to one gear holder, and the gear holder is swingable and V-groove driven. It is slidably mounted in the direction of the gear, and the gear holder is biased toward the V-groove drive gear by a spring to elastically contact the plurality of V-groove driven gears with the opposing V-groove drive gears. The present invention provides a binding wire feed mechanism for a reinforcing bar binding machine.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a binding wire feeding mechanism 1 and a binding wire twisting mechanism 2 of a reinforcing bar binding machine, which are built in a casing (not shown) having a grip like a hand-held tool such as a nailing machine. The wire wound on the wire reel (not shown) is supplied to the arc-shaped nose 6 by the binding wire feeding mechanism 1 through the binding wire guide hole 5 of the cutter block 4 provided in the nose portion 3.

FIG. 4 shows the binding wire feeding mechanism 1, in which V-grooved drive gears 8 and 9 are arranged on the base plate 7 along the traveling direction of the wire W, and two front and rear V-grooved drive gears 8 are provided. Driven gears 10 and 11 with V-grooves are engaged with and 9 and 9, respectively. Two V
The grooved drive gears 8 and 9 mesh with the intermediate gear 12, and power is transmitted from the feed motor 13 via the reduction gear 14 and the intermediate gear 12, and the two V-groove drive gears 8 and 9 are synchronized. Rotate.

The two front and rear V-groove driven gears 10 and 11 are mounted on a bell crank type gear holder 15. A long hole 16 in a direction orthogonal to the wire feeding direction is formed in the middle of the gear holder 15, and a pin 17 provided on the base plate 7 is engaged with the long hole 16 to move the gear holder 15 back and forth and left and right. Holds freely. Lever 18 on base plate 7
Is attached to the tip of the lever 18 and the gear holder 15
The rear end portion (the right end portion in the figure) is pin-connected. A compression coil spring 20 is interposed between a rear end portion of the lever 18 and a spring receiving seat 19 provided on the base plate 7, and the tip end portion of the lever 18 and the gear holder 15 are opposed to each other by the V force of the compression coil spring 20. The two V-groove driven gears 10 and 11 are biased toward the grooved drive gears 8 and 9, and are in elastic contact with the V-groove driven gears 8 and 9, respectively.

When using the reinforcing bar binding machine, the lever
When the lever 18 is rotated by pushing the rear end of 18 with a finger, the gear holder 15 is retracted, the two V-groove driven gears 10 and 11 are separated from the V-groove drive gears 8 and 9, and the wire reel is moved. When the tip end of the wire W drawn from is passed between the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11 to release the pressing of the lever 18,
The wire W is sandwiched between the V grooves of the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11, and the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11 mesh with each other. Ready to go.

When the linearity of the wire is poor, the V-groove driven gear 10 moves laterally when the upstream V-groove drive gear 8 and the V-groove driven gear 10 pull in the wire. The V-groove driven gear 8 may be pushed away from the V-grooved drive gear 8, but at this time, the gear holder 15 swings around the pin 17 as a fulcrum and the downstream V-groove driven gear 11 meshes with the V-groove drive gear 9. The wire W is continuously fed. Further, due to the local unevenness of the wire passing through the upstream V-groove driving gear 8 and the V-groove driven gear 10, the downstream V-groove driving gear 9 is formed.
Even if the V-groove driven gear 11 and the V-groove driven gear 11 are disengaged from each other, it is possible that the upstream V-groove driven gear 8 and the V-groove driven gear 10 mesh with each other and the wire feeding is stopped. Absent.

Next, the binding wire twisting mechanism 2 will be described. As shown in FIGS. 1 and 2, the binding wire twisting mechanism 2 has two motors, a twisting motor 21 and a slide motor 22, and the twisting motor 21 drives a final gear 23 via a reduction gear train. A ball screw shaft 24 is spline-fitted in the center hole of the final gear 23. A male screw is formed at the tip of the ball screw shaft 24, and the shaft of a central clamp plate 26, which is a part of the binding wire clamp device 25, is rotatably coupled to the tip thereof. The cable tie clamp device 25 includes a central clamp plate 26, clamp plates 27 and 28 arranged on the left and right of the central clamp plate 26, and three clamp plates 2
It consists of a sleeve 29 covering 6, 27, 28 and a ball holding ring 30 fitted to the rear end of the sleeve 29.
The ball (not shown) fitted in the hole of the ball screw shaft 24
It meshes with the male screw.

When the torsion motor 21 rotates in the forward direction, the rotation of the ball screw shaft 24 causes the sleeve 29 to retract. Anti-rotation fins 31 are radially arranged on the outer periphery of the ball pressing ring 30, and at the initial position, which is the frontmost position, the anti-rotation fins of the ball pressing ring 30 are attached to the anti-rotation claws (not shown) provided on the casing. 31 is engaged and the binding wire clamp device 25 is in a state in which it cannot rotate.

A shifter disc 32, which is rotatable with respect to the ball screw shaft 24, is attached to an intermediate portion of the ball screw shaft 24. The shifter disk 32 is connected to a ball pressing ring 34 screwed into a ball screw shaft 33 of the slide motor 22, and the ball screw shaft 24 and the binding wire clamp device 25 of the binding wire twisting mechanism 2 are connected according to the rotation direction of the slide motor 22. Moves back and forth.

The left and right clamp plates 27, 28 can slide in parallel to the left and right along a guide pin 35 provided on the central clamp plate 26.
Guide pins 36, 37 provided on 7, 28 are engaged with groove cams 38 formed on the inner peripheral surface of the sleeve 29. The grooved cam 38 has a cam shape in which the left and right clamp plates 27, 28 approach each other when the sleeve 29 retracts, and finally the left and right clamp plates 27, 28 are located in the central clamp plate 26.
Sandwich.

Next, the operation of the reinforcing bar binding machine will be described. Figure 1
3 to FIG. 3 show an initial state, and when the trigger is pulled from this state, the torsion motor 21 rotates in the positive direction a predetermined number of times, and the sleeve 29 retreats and the left and right clamp plates as shown in FIG.
27 and 28 are lightly closed. The clamp plate 27 on the right side (upper side in FIG. 5 (a)) viewed from the operator is provided with a binding wire guide groove 39 serving as a wire feeding passage. The left clamp plate 28 has a channel-shaped recess 40 extending from the upper part to the lower end of the inner surface, and the wire is introduced into the recess 40 of the clamp plate 28 from below in the next wire feeding step.

Subsequently, as shown in FIG. 6, the feed motor 13 is activated, and the two pairs of front and rear V-groove drive gears 8 and 9 and V-groove driven gears 10 and 11 rotate to rotate the clamp plate 27 on the right side. Wire W fed to arc-shaped nose 6 through guide groove 39
Bends in a loop along the shape of the guide groove on the inner circumference of the arc-shaped nose 6, the tip enters into the recess 40 from the lower surface opening of the left clamp plate 28, and hits the ceiling of the recess 40 to stop. The feed amount of the wire W is a control device (not shown)
Controlled by. In addition, S is a reinforcing bar.

After the feed motor 13 stops, the torsion motor 21
The sleeve 29 is retracted further as shown in Fig. 7, and the left clamp plate 28 is moved to the center clamp plate.
The tip of the wire W is sandwiched by being pressed against 26. Subsequently, as shown in FIG. 8, the feed motor 13 is reversely driven to pull back the wire W, the wire W is wound around the reinforcing bar S, and then the feed motor 13 is normally driven as shown in FIG. Is sent out for a specified length. This is because the twist margin of the wire W is set to a constant length and the protrusion amount of the knot portion is made uniform regardless of the thickness of the bundle of reinforcing bars to be bound.

Then, as shown in FIG. 10, the sleeve 29 is further retracted, and the wire W is firmly sandwiched between the left and right clamp plates 27, 28 and the central clamp plate 26.
As shown in 1, the slide motor 22 is driven in the normal direction to retract the ball screw shaft 24 and the binding wire clamp device 25. When the binding wire clamp device 25 moves in parallel with the binding wire guide hole 5 of the cutter block 4, the wire W is sheared at the position of the guide groove 39 of the left clamp plate 27 and the sliding surface of the binding wire guide hole 5. It

Then, as shown in FIG. 12, when the binding wire clamp device 25 is further retracted to apply tension to the wire W and the drive load of the slide motor 22 is increased, the drive current reaches a prescribed upper limit value. Stop the slide motor 22. In the tensioning step, the binding wire clamp device 25 may be first rotated a half turn so that the grasped wire W is crossed and then retracted.

Next, the torsion motor 21 is driven in the normal direction, and the rotation stopping fin 31 of the ball pressing ring 30 retracted from the initial position is disengaged from the rotation stopping claw of the casing.
As the binding wire clamp device 25 rotates as shown in FIG. 13, the slide motor 22 is reversely driven to move the ball screw shaft 24 and the binding wire clamp device 25 forward, and the binding wire clamp device 25 approaches the reinforcing bar S to move the wire W. Twist.

Then, as shown in FIG. 14, when the driving current reaches a specified upper limit value due to an increase in the driving load of the torsion motor 21 at the time when the specified distance is advanced, or when the torsion is completed, the torsion motor 21 slides with the torsion motor 21. The drive of the motor 22 is stopped. Then, as shown in FIG. 15, the torsion motor 21 is rotated in the reverse direction, the sleeve 29 is moved forward, and the left and right clamp plates 2 are moved.
After opening 7, 28 and releasing the bundled wires W, the twisting motor 21 and the slide motor 22 are controlled to return the binding wire clamp device 25 to the initial position to complete one cycle of the binding operation.

The present invention is not limited to the above embodiment, and the wire is described as an example of the binding wire, but a wire other than the metal wire may be used. Further, various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications.

[0023]

As described above, in the binding wire feed mechanism of the reinforcing bar binding machine of the present invention, since two sets of the feed mechanism with the V-groove gears are arranged in the binding wire feed path in the front and rear, the binding wire is bent. Even if the upstream V-grooved gear is disengaged, the downstream V-grooved gear is meshed, so that the feeding does not stop or become unstable. It can be controlled to be constant, and the binding performance of the reinforcing bar binding machine is improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a mechanical portion of a reinforcing bar binding machine of the present invention.

FIG. 2 is a plan sectional view showing a mechanical portion of the reinforcing bar binding machine of the present invention.

FIG. 3 is a front view showing a mechanical portion of the reinforcing bar binding machine of the present invention.

FIG. 4 shows a binding wire feeding mechanism of a reinforcing bar binding machine, (a) is a front view and (b) is a side sectional view.

FIG. 5 shows a binding wire passage forming process of the reinforcing bar binding machine, (a)
Is a plan sectional view, (b) is a front view, and (c) is a side sectional view.

6A and 6B show a binding wire feeding step, wherein FIG. 6A is a plan sectional view and FIG.
Is a front view and (c) is a side sectional view.

FIG. 7 shows a binding wire gripping step, (a) is a plan sectional view, and (b) is a sectional view.
Is a front view and (c) is a side sectional view.

FIG. 8 shows a step of pulling back the binding wire of the binding wire twisting mechanism,
(a) is a plan sectional view, (b) is a front view, and (c) is a side sectional view.

FIG. 9 shows a binding wire re-feeding step, (a) is a plan sectional view,
(b) is a front view and (c) is a side sectional view.

FIG. 10 shows a binding wire gripping step, (a) is a plan sectional view,
(b) is a front view and (c) is a side sectional view.

FIG. 11 shows a binding wire cutting step, (a) is a plan sectional view,
(b) is a front view and (c) is a side sectional view.

FIG. 12 shows a binding line tensioning step, (a) is a plan sectional view,
(b) is a front view and (c) is a side sectional view.

FIG. 13 shows a twisting process, (a) is a front view and (b) is a side sectional view.

FIG. 14 shows a twisted state, (a) is a plane sectional view, (b)
Is a front view and (c) is a side sectional view.

FIG. 15 shows a binding wire opening step, (a) is a plan sectional view,
(b) is a front view and (c) is a side sectional view.

[Explanation of symbols]

1 Bundling wire feed mechanism 2 Bundling wire twisting mechanism 6 arc nose 7 Base plate 8.9 Drive gear with V groove 10. 11 Driven gear with V groove 12 Intermediate gear 13 Feed motor 14 Reduction gear 15 gear holder 16 long hole 17 pin 18 lever 19 Spring seat 20 Compression coil spring 21 torsion motor 22 Slide motor 24 ball screw shaft 25 Cable tie clamp device 26 Central clamp plate 27 Right clamp plate 28 Left clamp plate 29 Sleeve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takahiro Nagaoka             6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo             Cos Co., Ltd. (72) Inventor Osamu Itagaki             6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo             Cos Co., Ltd. (72) Inventor Yokochi             6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo             Cos Co., Ltd. F term (reference) 3E052 AA42 AA50 BA18 CA20 FA09                       HA09 JA02 LA05

Claims (2)

[Claims] 1. A binding wire feed mechanism for a reinforcing bar binding machine, comprising a V-groove drive gear having a circumferential V-groove formed on its outer peripheral surface and a V-groove driven gear, wherein the V-groove driven gear is driven by a spring. In the binding wire feed mechanism of the reinforcing bar binding machine, the gear is elastically contacted with the V-groove drive gear, and the binding wire is sandwiched between the V-groove drive gear and the V-groove driven gear, and is fed along the path of the binding wire. Multiple V
A binding wire feed mechanism for a reinforcing bar binding machine, wherein a grooved drive gear is arranged, and a plurality of V-groove driven gears are elastically contacted with a V-groove driven gear by a spring. 2. A binding wire feed mechanism for a reinforcing bar binding machine, comprising a V-groove drive gear having a V-groove formed in the circumferential direction on its outer peripheral surface and a V-groove driven gear, which are driven by a V-groove by a spring. In the binding wire feed mechanism of the reinforcing bar binding machine, the gear is elastically contacted with the V-groove drive gear, and the binding wire is sandwiched between the V-groove drive gear and the V-groove driven gear, and is fed along the path of the binding wire. Multiple V
Along with the grooved drive gear, a plurality of V-groove driven gears are attached to one gear holder, the gear holder is swingable and slidable in the direction of the V-groove drive gear, and the gear holder is mounted by a spring. A binding wire feeding mechanism for a reinforcing bar binding machine, characterized in that a plurality of V-groove driven gears are biased toward the grooved drive gears to elastically contact the respective V-groove driven gears, respectively.