JP2003041775A - Reinforcement binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement binding machine superior in the binding finish. SOLUTION: A binding wire clamp device 1 is composed of three clamp plates 2, 3, and 4 and a sleeve 5. A cam mechanism is arranged for converting a longitudinal movement of the sleeve into opening-closing motion of the left and right clamp plates. When sending out a binding wire by a binding wire feeder in a state of opening the left and right clamp plates, the binding wire is sent to a nose through between the center and right clamp plates 2 and 3, and draws a loop, and enters between the center and left clamp plates 2 and 4. The sleeve is driven for advancing, and the binding wire is gripped by closing the left and right clamp plates. Then, the rear end of the binding wire loop is cut by a binding wire cutter, and the binding wire clamp device 1 rotates, and binds the binding wire by twisting both ends of the binding wire loop. Since both ends of the binding wire are gripped and twisted differently from a conventional reinforcement binding machine, the binding wire is not wasted, and is beautifully finished.

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, and more particularly to a reinforcing bar binding machine configured to appropriately control the length of a binding wire according to the diameter of the reinforcing bar.

[0002]

2. Description of the Related Art A reinforcing bar binding machine sends a binding wire such as a wire wound on a reel and winds it around a reinforcing wire, and a binding wire winding mechanism that twists the binding wire wound around the reinforcing bar. It has a binding wire twisting mechanism that binds
The binding wire feed mechanism and the binding wire twisting mechanism are sequentially operated by the trigger operation to perform one cycle of the binding operation.

When the arc-shaped nose of the reinforcing bar binding machine is hung on the reinforcing bar and the trigger lever is pulled, the binding wire is fed by the binding wire feeding mechanism along the inner peripheral surface of the nose to form a binding wire loop around the reinforcing bar. Then, the rear end of the binding wire loop is cut by a cutter mechanism, and a pair of hook-shaped hooks of the binding wire twisting mechanism are closed to grab the binding wire loop and then rotate to twist the binding wire loop to bind the reinforcing bars. .

In the conventional reinforcing bar binding machine, the binding wire is wound around the reinforcing bar more than two times to bind it, and the length of the binding wire sent out is constant regardless of the diameter of the reinforcing bar, so that the binding wire consumption is large. There is. Also, if the diameter of the reinforcing bar is small, the amount of twisting of the binding wire will be large, and the time required for twisting will be long, and the binding wire will not be able to be given sufficient tension and the binding force will be insufficient. There is also. Further, since the length of the twisted portion is long, a binding wire may project from the surface of the concrete when pouring the concrete, which may cause a problem in the finish.

Therefore, there is a technical problem to be solved in order to appropriately control the length of the binding wire according to the diameter of the reinforcing bar to improve the binding finish and reduce the waste of the binding wire. The invention aims to solve the above problems.

[0006]

The present invention is proposed in order to achieve the above-mentioned object, and a binding wire feeding mechanism for feeding a binding wire in a loop shape and winding it around a reinforcing bar, and a binding wire feeding mechanism wound around the reinforcing bar. Hold the bundled wire with a holding means such as a hook,
In an electric rebar binding machine having a binding wire twisting mechanism for twisting a binding wire by rotating the gripping means to bind the reinforcing bars, a central clamp plate and openable and closable clamp plates arranged on both left and right sides of the central clamp plate. The binding wire is fed by the binding wire feeding mechanism to pass the binding wire between the central clamp plate and either one of the left and right clamp plates, and the tip of the fed binding wire loop is connected to the central clamp plate and the other. The present invention provides a reinforcing bar binding machine configured to hold the binding wire loop by closing the left and right clamp plates after being introduced between the binding plate and the clamp plate.

Further, after closing the clamp plate on the side for gripping the tip of the binding wire loop and gripping the tip of the binding wire loop, the binding wire feeding mechanism is reversely driven to pull back the binding wire, and the loop length of the binding wire is reduced. Provided is a reinforcing bar binding machine configured to be adjusted according to the diameter of the reinforcing bar.

In addition, the left and right clamp plates are provided with a sloping portion or a convex portion which extends over the upper end surface or the lower end surface of the central clamp plate at the time of clamping to provide a reinforcing bar binding for bending and deforming the binding wire at the time of clamping the binding wire. To do.

[0009]

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 components of a binding wire clamp device 1 of a reinforcing bar binding machine, 2 is a central clamp plate, 3 is a left clamp plate, 4 is a right clamp plate, and 5 is an armor mounted on a shaft portion of the central clamp plate. It is a sleeve.

A longitudinal guide pin 6 is provided at an intermediate portion of the central clamp plate 2, and slide guide grooves 7 and 8 formed on inner surfaces of the left and right clamp plates 3 and 4 are engaged with the guide pin 6. Then, the left and right clamp plates 3 and 4 are assembled to the central clamp plate 2 so as to be openable and closable. Groove cams 9 and 10 are formed on the left and right clamp plates 3 and 4, and the groove cams 9 and 10 are connected to the guide pin 1 of the sleeve 5.
Engage with 1, 12. The grooved cams 9 and 10 have a step shape in which the front part is translated outward with respect to the rear part, and when the sleeve 5 advances relative to the three clamp plates 2, 3 and 4, the left and right clamp plates are moved. The structure is such that 3, 4 move toward each other and sandwich the central clamp plate 2. Groove cams on left and right clamp plates 9, 1
0 is out of phase, and the right clamp plate 3 (upper in the figure) is the center clamp plate 2 when the sleeve advances.
And then the left clamp plate 4 contacts the central clamp plate 2.

FIG. 4 shows a state in which the three clamp plates 2, 3, 4 and the sleeve 5 and the ball screw shaft 13 are assembled.
The shaft portion of the central clamp plate 2 is rotatably connected to the ball screw shaft 13, and a ball (not shown) attached to the inner peripheral surface of the sleeve 5 meshes with the ball screw shaft 13. Figure 4 (b)
As shown in Fig. 4, the inner surface of the right clamp plate 3 (left in (b)) has a slope that approaches the center from the upper and lower middle portions, and the stopper portion 14 that horizontally projects from the upper end of the slope to the center. Are formed. In addition, symmetrically, the inner surface of the left clamp plate 4 (right in (b)) is an inclined surface that approaches the center from the upper and lower intermediate portions.

When the reinforcing bar binding machine is activated, a wire is fed from below by a binding wire feeding device (not shown) between the left clamp plate 4 and the central clamp plate 2 to form an arc-shaped nose (not shown). The tip of the wire W that has been sent along and is formed into a loop shape enters between the right clamp plate 3 and the center clamp plate 2 from below, and as shown in FIG. Stop at part 14. Then, a torsion motor (not shown) is activated, and the ball screw shaft 13 is rotated counterclockwise as viewed from the motor side to advance the sleeve 5.
As a result, as shown in FIG. 5 (b), the right clamp plate 3
Slides toward the center to clamp the wire W, and bends the tip of the wire W toward the center by the upper slope. When the sleeve 5 is further advanced as shown in FIG. 6, the left clamp plate 4 slides toward the center to clamp the wire W as shown in FIG. 6 (b), and at the same time, the rear end of the wire loop is moved by the lower slope. Is bent toward the center and the next twisting process is started.

FIG. 7 shows a binding mechanism portion of a reinforcing bar binding machine. The ball screw shaft 13 is spline-coupled to a hollow drive shaft 15, and is pushed down to a rear position by a compression coil spring 16 inserted in the drive shaft 15. . The drive shaft 15 is rotationally driven via a torsion motor and a reduction gear mechanism (not shown). A shifter plate 18 is engaged with a circumferential groove 17 formed at the rear end portion of the sleeve 5, and the shifter plate 18 that moves back and forth together with the sleeve 5 places the binding wire cutting device 19 arranged below and the binding wire cutting device 19 arranged above. Bundled wire guide device
Drive 20 and.

The binding wire cutting device 19 is a rotary wire in which a pin 21 fixed to the front part of a frame is formed with a hole traversing the axial center, and a cylindrical sleeve 22 mounted on the pin 21 is formed with wide holes on both front and rear sides. It is a cutter, and a front lever 23 and a rear lever 24 to which a cylindrical sleeve 22 is attached are connected by a link 25. The binding wire cutting device 19 is set in the initial state of FIG. 7 by a spring (not shown), and at this time, the holes of the pin 21 and the cylindrical sleeve 22 are aligned with each other.
W is sent out through the hole of the pin 21. When the sleeve 5 of the binding wire clamp device 1 moves forward, the rear lever 24 of the binding wire cutting device 19 is pushed forward by the shifter plate 18, and the front cylindrical sleeve 22 rotates in conjunction with the exit of the pin 21 hole. Cut the wire W with.

The bundling wire guide device 20 has a construction in which a forming plate 26 which is rotatable in the lateral direction is driven by a slide cam plate 27, and a shaft 28 of the lever-shaped forming plate 26 is attached to a support frame 29. . A circumferential guide groove 31 is provided on the inner peripheral surface of the arc-shaped nose 30, and the side surface of the base portion is partially cut out, and the front end portion of the forming plate 26 is inserted into this cutout portion. . Note that the guide groove 31 may have any shape as long as it can curl the bundling line and guide it, and may have a polygonal shape in which straight lines are connected stepwise, and is not limited to an arc shape.

Forming plate as shown in FIG.
A guide portion 32 is formed on the side surface of the front end portion of 26, as shown in FIG.
In the initial state shown in, the guide portion 32 has the circular arc nose 30.
Since the wire W is in contact with the notch of
And the guide groove 31 of the arc-shaped nose 30.
It is sent out along with the guide part 32 and the guide groove.
31 and are formed into an arc shape.

The slide cam plate 27 has a long hole 33 in the front-rear direction formed on its side surface. In the initial state, the long hole 33 is formed.
The rear end of the forming plate 26 is in contact with the front surface of 33. The rear end portion of the slide cam plate 27 is engaged with the shifter plate 18, and the sleeve 5 and the slide cam plate 27 slide integrally back and forth. When the slide cam plate 27 moves forward from the initial position, the forming plate 26 moves the compression coil spring 34 as shown in FIG. 8 (a).
The rear end of the slide cam plate 27 is
It falls into 33 and the front guide part 32 separates from the arc-shaped nose 30. Further, when the slide cam plate 27 returns to the initial position, the rear end portion of the forming plate 26 comes out of the elongated hole 33, and the front guide portion 32 comes into contact with the cutout portion of the arc-shaped nose.

Next, the operation of the reinforcing bar binding machine will be described. Figure 7
Shows a state in which the wire W is fed out from the initial state by the binding wire feeding device and a wire loop surrounding the periphery of the reinforcing bar S is formed.As shown in FIG. Abut 14 and stop.

Subsequently, the ball screw shaft 13 is driven to rotate in the forward direction, and as shown in FIG.
Moves forward, the right clamp plate 3 closes as shown in FIG. 5, and the tip of the wire W is clamped. At the same time, the forming plate 26 of the binding wire guide device 20 is opened, the binding wire feeder is driven in reverse, and the wire W is pulled back to rebar S
Wrap around.

Then, as shown in FIGS. 9 and 6, the left clamp plate 4 is closed to clamp the rear end of the wire loop, and the sleeve 5 is further advanced as shown in FIG. Push the rear lever 24, the front cylindrical sleeve
22 turns to cut the wire W. Then, as the sleeve 5 advances, the anti-rotation fins 35 provided at the rear end of the sleeve 5 come off from the stopper (not shown) of the frame, and the whole binding wire clamp device 1 starts to rotate and the wire W
Twist. At this time, the tension of the wire W increases as the twisting progresses, and the wire W slides between the clamp plates with the ends bent by the left and right clamp plates 3 and 4 as fulcrums, and the binding wire clamp device 1 It is twisted into a shape that is pulled out from the top and bottom center of the front of the.

FIG. 11 shows a state in which the twisting is completed. The current detection circuit detects an increase in the rotational load of the twisting motor, and the driving of the twisting motor is stopped. Although the length of the twist margin of the wire W varies depending on the diameter of the reinforcing bar, when the twist margin is short, the ball screw shaft 13 and the binding wire clamp device 1 are installed in the drive shaft 15 as shown in FIG. The compression coil spring 16 is compressed and moved forward to limit the tension according to the wire length, thereby preventing the wire from being cut.

Then, after the twisting is completed, the twisting motor is driven in the reverse direction, and as shown in FIG.
Returns to the initial position, the left and right clamp plates 3 and 4 open to release the wire W, and the binding wire cutting device 19 and the binding wire guide device 20 also return to the initial state. Although the wire has been described as an example of the binding wire here, a wire material other than a metal wire may be used.

FIGS. 14 and 15 show another embodiment of the binding wire clamp device. Contrary to the binding wire clamp device 1 described above, groove cams 42 and 43 are formed in the sleeve 41, and left and right clamp plates 44 are formed. , 45 with guide pins 46, 47, sleeve
Although the left and right clamp plates 44 and 45 are configured to close when 41 is retracted, the operation is the same as that of the above binding wire clamp device.

FIG. 16 shows another embodiment of the slide mechanism for moving the binding wire clamp device 1 back and forth.
A shifter disc 51, which is rotatable with respect to the ball screw shaft 13, is attached to an intermediate portion of 13. The ball holding ring 55 is fitted on the ball screw shaft 54 of the slide motor 53 arranged in parallel with the torsion motor 52.
55 is connected to the shifter disc 51. Therefore, the ball screw shaft 13 of the binding wire twisting mechanism and the binding wire clamp device 1 move back and forth according to the rotation direction of the slide motor 53, and the binding wire clamp device 1 is gripped after gripping the binding wire as in the embodiment described above. The wire is cut by retracting from the front initial position and the wire loop is tensioned. Then, when the drive current reaches a specified upper limit value due to an increase in the drive load of the slide motor 53, the slide motor 53 is stopped and the twisting process starts. Although not shown, the shifter disc 51 is provided with position detecting means such as an optical position detecting sensor including a photo interrupter and a slit plate.
Alternatively, the slide motor 53 may be mounted on the ball pressing ring 55 or the like, and the position detection means may detect the front-back position of the binding wire clamp device 1 to control the drive of the slide motor 53.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. Is.

[0026]

As described above, in the reinforcing bar binding machine of the present invention, instead of the conventional structure in which the hook is hooked on the binding wire loop and twisted, the tip and the rear end of the binding wire loop are clamped by the clamp plate. Since it is configured to be sandwiched and twisted, the surplus protruding portion of the binding wire after twisting is almost eliminated, and the finish is improved.

Further, by forming the binding wire loop and then pulling back the binding wire and twisting the loop length of the binding wire according to the diameter of the reinforcing bar, the time required for twisting is shortened and the reinforcing bar is The adhesiveness between the binding wire and the binding wire is good, the binding strength is stabilized, and the consumption amount of the binding wire is reduced.

Further, by forming slopes or convex portions on the left and right clamp plates that hang on the upper end surface or the lower end surface of the central clamp plate at the time of clamping, both ends of the binding wire can be bent and deformed at the time of clamping the binding wire. Can be firmly clamped.

[Brief description of drawings]

FIG. 1 is an exploded plan view of a binding wire clamp device of a reinforcing bar binding machine, showing an embodiment of the present invention.

FIG. 2 is an exploded side view of the cable tie clamp device.

FIG. 3 is a front view of three clamp plates.

4A and 4B show an initial state of the binding wire clamp device, FIG. 4A is a plan sectional view, FIG. 4B is a front sectional view, and FIG. 4C is a side sectional view.

5A and 5B show a binding wire tip gripping process of the binding wire clamp device, wherein FIG. 5A is a plan sectional view, FIG. 5B is a front sectional view, and FIG.

6A and 6B show a binding wire rear end gripping process of the binding wire clamp device, wherein FIG. 6A is a plan sectional view, FIG. 6B is a front sectional view, and FIG.

FIG. 7 shows a binding wire feeding step of the reinforcing bar binding machine, (a) is a plan view of the binding wire guide device, and (b) is a side view of the reinforcing bar binding machine.

8A and 8B show a binding wire pulling back process of the reinforcing bar binding machine, FIG. 8A is a plan view of the binding wire guide device, and FIG. 8B is a side view of the reinforcing bar binding machine.

FIG. 9 shows a binding wire rear end gripping process of the reinforcing bar binding machine, (a)
[FIG. 3] is a plan view of a binding wire guide device, and (b) is a side view of a reinforcing bar binding machine.

FIG. 10 shows a binding wire cutting step of the reinforcing bar binding machine, (a) is a plan view of the binding wire guide device, and (b) is a side view of the reinforcing bar binding machine.

FIG. 11 shows a twisting process of a binding wire of a reinforcing bar binding machine, (a)
[FIG. 3] is a plan view of a binding wire guide device, and (b) is a side view of a reinforcing bar binding machine.

FIG. 12 shows a twisting process of a binding wire of a reinforcing bar binding machine, (a)
[FIG. 3] is a plan view of a binding wire guide device, and (b) is a side view of a reinforcing bar binding machine.

FIG. 13 shows a binding wire opening process of the reinforcing bar binding machine, (a) is a plan view of the binding wire guide device, and (b) is a side view of the reinforcing bar binding machine.

FIG. 14 is an exploded plan view showing another embodiment of the binding wire clamp device.

FIG. 15 is a plan sectional view showing another embodiment of the binding wire clamp device.

FIG. 16 is a side view of a mechanical section of a reinforcing bar binding machine according to another embodiment.

[Explanation of symbols]

1 Cable tie clamp device 2 Central clamp plate 3 Right clamp plate 4 Left clamp plate 5 sleeve 9. 10 groove cam 11.12 Guide pin 13 Ball screw shaft 14 Stopper part 18 shifter plate 19 Cable tie cutting device 20 Cable tie guide device

   ─────────────────────────────────────────────────── ─── 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.

Claims (3)

[Claims] 1. A binding wire feeding mechanism for feeding a binding wire in a loop shape and winding the binding wire around a reinforcing bar, and a binding wire wound around the reinforcing bar is gripped by a gripping means such as a hook, and the gripping means is driven to rotate. In an electric rebar binding machine having a binding wire twisting mechanism for twisting a binding wire to bind the reinforcing bars, a gripping means is constituted by a central clamp plate and openable and closable clamp plates arranged on both left and right sides thereof, The binding wire fed by the binding wire feed mechanism is passed between the central clamp plate and either one of the left and right clamp plates, and the tip of the fed binding wire loop is introduced between the central clamp plate and the other clamp plate. After that, the reinforcing bar binding machine configured to close the left and right clamp plates and grip the binding wire loop. 2. After the clamp plate on the side for gripping the tip of the binding wire loop is closed to grip the tip of the binding wire loop, the binding wire feeding mechanism is reversely driven to pull back the binding wire,
The reinforcing bar binding machine according to claim 1, wherein the loop length of the binding wire is adjusted according to the diameter of the reinforcing bar. 3. The left and right clamp plates are formed with slopes or projections that hang over the upper end surface or the lower end surface of the central clamp plate during clamping, and the binding wires are bent and deformed during the binding wire clamping. Rebar binding machine.