JP4747454B2 - Rebar binding machine - Google Patents

Description

[0001]
BACKGROUND 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 in accordance with the reinforcing bar diameter.
[0002]
[Prior art and problems to be solved by the invention]
The rebar binding machine has a bundling wire feed mechanism that sends out a bundling wire such as a wire wound around a reel and winds it around the rebar, and a bundling wire twisting mechanism that twists and binds the bundling wire wound around the rebar. Then, the binding wire feeding mechanism and the binding wire twisting mechanism are sequentially operated by the trigger operation to perform the binding operation for one cycle.
[0003]
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 feed mechanism sends the binding wire along the inner peripheral surface of the nose to form a binding wire loop around the reinforcing bar. The rear end of the wire loop is cut by a cutter mechanism, and the pair of hook-type hooks of the binding wire twisting mechanism is closed and grips the binding wire loop to rotate, and the binding wire loop is twisted to bind the reinforcing bars.
[0004]
The conventional reinforcing bar binding machine has a problem that the binding wire is consumed in a large amount because the binding wire is wound around the reinforcing bar for two or more turns and is sent out regardless of the diameter of the reinforcing bar. In addition, if the diameter of the reinforcing bar is thin, the twisting amount of the binding wire increases, and it takes a long time to twist, and the binding wire cannot be sufficiently tensioned and the binding force becomes insufficient. There is also. Further, since the length of the twisted portion is long, the binding wire may protrude from the surface of the concrete when the concrete is placed, which may cause a problem in the finish.
[0005]
Therefore, there is a technical problem to be solved in order to improve the binding finish by appropriately controlling the length of the binding wire in accordance with the diameter of the reinforcing bar and reduce the waste of the binding wire. The purpose is to solve the problem.
[0006]
[Means for Solving the Problems]
The present invention is proposed to achieve the above 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 gripping means such as a hook for binding the binding wire wound around the reinforcing bar An electric rebar tying machine equipped with a binding wire twisting mechanism that twists the binding wire and binds the reinforcing bars by rotating the gripping means and rotating the gripping means ,
A gripping means is constituted by the central clamp plate and the open / close clamp plates arranged on the left and right sides thereof, and the binding wire sent out by the binding wire feed mechanism is passed between the central clamp plate and the left or right clamp plate. In the reinforcing bar binding machine configured to hold the binding wire loop by closing the left and right clamp plates after introducing the leading end of the sent binding wire loop between the central clamp plate and the other clamp plate ,
The left and right clamp plates are formed by forming a slope or protrusion over the upper or lower end surface of the center clamp plate during clamping, and bending the binding wire when clamping the binding wire,
The sloped portion or convex portion of the right clamp plate is a sloped or convex portion that approaches from the upper and lower intermediate portions of the inner surface of the right clamp plate toward the center, and the sloped portion or convex portion of the left clamp plate The present invention provides a reinforcing bar binding machine in which the lower side of the inner surface of the left clamp plate is a slope or a convex part approaching from the upper and lower intermediate parts toward the center .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 show components of the 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 externally mounted on a shaft portion of the central clamp plate. This is a sleeve.
[0010]
A vertical guide pin 6 is provided in the middle part of the central clamp plate 2, and the slide guide grooves 7 and 8 formed on the inner surfaces of the left and right clamp plates 3 and 4 are engaged with the guide pin 6, The left and right clamp plates 3 and 4 are assembled to the central clamp plate 2 so as to be freely opened and closed. 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 engaged with the guide pins 11 and 12 of the sleeve 5. The groove cams 9 and 10 have a step shape in which the front part is translated outward with respect to the rear part. When the sleeve 5 moves forward relative to the three clamp plates 2, 3 and 4, the right and left clamp plates 3 and 4 move in the direction of approaching each other, and the center clamp plate 2 is sandwiched. The groove cams 9 and 10 of the left and right clamp plates are out of phase, and when the sleeve advances, the right clamp plate 3 (upper in the figure) first contacts the center clamp plate 2, and then the left clamp plate 4 contacts the center clamp plate 2. Touch.
[0011]
FIG. 4 shows a state in which three clamp plates 2, 3, 4, a sleeve 5 and a 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 the sleeve 5 A ball (not shown) attached to the inner peripheral surface meshes with the ball screw shaft 13. As shown in Fig. 4 (b), the upper side of the inner surface of the right clamp plate 3 (left in Fig. 4 (b)) is a slope approaching the central direction, and is horizontally oriented from the upper end of the slope to the central direction. A protruding stopper portion 14 is formed. Further, symmetrically, the inner surface of the left clamp plate 4 (right in (b)) is an inclined surface whose lower part approaches the central direction from the upper and lower intermediate part.
[0012]
When the reinforcing bar binding machine is started, a wire is sent from below between the left clamp plate 4 and the central clamp plate 2 by a binding wire feeder (not shown), and sent along an arc nose (not shown). The tip of the wire W that is formed into a loop shape enters between the right clamp plate 3 and the center clamp plate 2 from below and hits the stopper portion 14 of the right clamp plate 3 as shown in FIG. Stop. Subsequently, a torsion motor (not shown) is activated, and the ball screw shaft 13 is rotated counterclockwise when 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 in the central direction to clamp the wire W, and the tip of the wire W is bent in the central direction by the upper slope. Then, when the sleeve 5 further advances as shown in FIG. 6, the left clamp plate 4 slides in the center direction to clamp the wire W as shown in FIG. Is bent in the central direction to enter the next twisting process.
[0013]
FIG. 7 shows a binding mechanism portion of a reinforcing bar binding machine. The ball screw shaft 13 is splined to a hollow drive shaft 15 and is pushed down to a rear position by a compression coil spring 16 inserted into 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 in the rear end portion of the sleeve 5, and the binding wire cutting device 19 disposed below is disposed above the shifter plate 18 that moves back and forth together with the sleeve 5. The bundled wire guide device 20 is driven.
[0014]
The binding wire cutting device 19 is a rotary wire cutter in which a hole crossing the axis center is formed in a pin 21 fixed to the front portion of the frame, and wide holes are formed on both front and rear surfaces of a cylindrical sleeve 22 attached to the pin 21. The front lever 23 to which the cylindrical sleeve 22 is attached and the rear lever 24 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). At this time, the holes of the pin 21 and the cylindrical sleeve 22 coincide with each other, and the wire W is fed out through the hole of the pin 21. It is. 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 outlet of the pin 21 hole. Cut the wire W with
[0015]
The binding wire guide device 20 has a configuration in which a forming plate 26 that 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 the cutout portion. . The guide groove 31 may be any shape that can guide by curling the binding line, and may be a polygonal shape in which straight lines are connected stepwise, and is not limited to an arc shape.
[0016]
As shown in FIG. 8 (a), a guide portion 32 is formed on the side surface of the front end portion of the forming plate 26. In the initial state shown in FIG. 7, the guide portion 32 contacts the notch portion of the arc-shaped nose 30. Therefore, the wire W passes between the guide portion 32 and the guide groove 31 of the arc-shaped nose 30 and is sent out along the guide groove 31. At this time, the guide portion 32 and the guide groove 31 form an arc shape. Is formed.
[0017]
The slide cam plate 27 has a longitudinal hole 33 formed on the side surface in the front-rear direction. In an initial state, the rear end portion of the forming plate 26 is in contact with a flat portion in front of the elongated hole 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 back and forth integrally. When the slide cam plate 27 advances from the initial position, as shown in FIG. 8 (a), the rear end portion of the forming plate 26 falls into the elongated hole 33 of the slide cam plate 27 by the bias of the compression coil spring 34, and the front portion The guide part 32 is separated from the arc nose 30. 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 contacts the notch portion of the arcuate nose.
[0018]
Next, the operation of the reinforcing bar binding machine will be described. FIG. 7 shows a state in which the wire W is sent out by the binding wire feeder from the initial state, and a wire loop surrounding the rebar S is formed, and the tip of the wire W is the right clamp plate 3 as shown in FIG. Stops in contact with the stopper 14.
[0019]
Subsequently, the ball screw shaft 13 is driven forward, the sleeve 5 of the binding wire clamp device 1 advances as shown in FIG. 8, the right clamp plate 3 closes and the tip of the wire W is clamped as shown in FIG. To do. At the same time, the forming plate 26 of the binding wire guide device 20 is opened, the binding wire feeding device is driven in reverse, and the wire W is pulled back and wound around the reinforcing bar S.
[0020]
Then, as shown in FIGS. 9 and 6, the left clamp plate 4 is closed and the rear end of the wire loop is clamped, and the sleeve 5 is further advanced as shown in FIG. And the front cylindrical sleeve 22 turns to cut the wire W. Then, as the sleeve 5 moves forward, the anti-rotation fin 35 provided at the rear end of the sleeve 5 comes off from the stopper (not shown) of the frame, and the entire binding wire clamp device 1 starts rotating to twist the wire W. Jiru. 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 Twisted in a shape drawn from the top and bottom center of the front.
[0021]
FIG. 11 shows a state where the torsion is completed. The current detection circuit detects an increase in the rotational load of the torsion motor and stops driving the torsion motor. The length of the torsional margin of the wire W varies depending on the diameter of the reinforcing bar, but when the torsional 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 advanced, and the tension is limited in accordance with the wire length, thereby preventing the wire from being cut.
[0022]
Then, after the torsion is completed, the torsion motor is driven in reverse, and as shown in FIG. 13, the binding wire clamp device 1 returns to the initial position, the left and right clamp plates 3 and 4 are opened, and the wire W is released. The binding wire cutting device 19 and the binding wire guide device 20 also return to the initial state. In addition, although the wire was demonstrated as an example here as a binding wire, wires other than a metal wire may be sufficient.
[0023]
14 and 15 show another embodiment of the binding wire clamp device. Contrary to the above-described binding wire clamp device 1, groove cams 42 and 43 are formed in the sleeve 41, and the left and right clamp plates 44 and 45 are formed. Guide pins 46 and 47 are provided so that the left and right clamp plates 44 and 45 are closed when the sleeve 41 is retracted, but the operation is the same as that of the previous binding wire clamp device.
[0024]
FIG. 16 shows another embodiment of a slide mechanism for moving the binding wire clamp device 1 back and forth, and a shifter disc 51 that is rotatable with respect to the ball screw shaft 13 is attached to an intermediate portion of the ball screw shaft 13. A ball pressing ring 55 is fitted to a ball screw shaft 54 of a slide motor 53 arranged in parallel with the torsion motor 52, and the ball pressing ring 55 is coupled to the shifter disc 51. Accordingly, 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 held after gripping the binding wire in the same manner as in the above-described embodiment. The wire is cut by moving backward from the front initial position and tension is applied to the wire loop. Then, when the drive current reaches a specified upper limit due to an increase in the drive load of the slide motor 53, the slide motor 53 is stopped and a twisting process is started. Although not shown, position detection means such as an optical position detection sensor such as a photo interrupter and a slit plate is interposed in the shifter disk 51 or the ball pressing ring 55 on the slide motor 53 side, and the binding wire is connected by the position detection means. The front and rear positions of the clamp device 1 may be detected and the drive control of the slide motor 53 may be performed.
[0025]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope of the present invention, and it is natural that the present invention extends to those modifications.
[0026]
【The invention's effect】
As described above, the reinforcing bar binding machine according to the present invention is twisted with the clamp plate sandwiching the front and rear ends of the binding wire loop instead of the conventional configuration in which the hook is hooked on the binding wire loop and twisted. Since it comprised in this way, the excess protrusion part of the binding wire after twist is almost lost, and a finish improves.
[0028]
In addition, the left and right clamp plates can be clamped firmly by bending and deforming both ends of the binding wire when clamping the binding wire, by forming the slopes on the upper or lower end surface of the central clamp plate when clamping. it can.
[Brief description of the drawings]
FIG. 1 is an exploded plan view of a binding wire clamp device of a reinforcing bar binding machine according to an embodiment of the present invention.
FIG. 2 is an exploded side view of a binding wire 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, where 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, where FIG. 5A is a plan sectional view, FIG. 5B is a front sectional view, and FIG. 5C is a side sectional view.
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. 6C is a side sectional view.
7A and 7B show a binding wire feeding process of the reinforcing bar binding machine, where FIG. 7A is a plan view of the binding wire guide device, and FIG. 7B is a side view of the reinforcing bar binding machine.
FIGS. 8A and 8B show a binding wire pullback process of the reinforcing bar binding machine, where 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;
9A and 9B show a binding wire rear end gripping process of the reinforcing bar binding machine, wherein FIG. 9A is a plan view of the binding wire guide device, and FIG. 9B is a side view of the reinforcing bar binding machine.
10A and 10B show a binding wire cutting process of the reinforcing bar binding machine, wherein FIG. 10A is a plan view of the binding wire guide device, and FIG. 10B is a side view of the reinforcing bar binding machine.
11A and 11B show a binding wire twisting process of the reinforcing bar binding machine, wherein FIG. 11A is a plan view of the binding wire guide device, and FIG. 11B is a side view of the reinforcing bar binding machine.
12A and 12B show a binding wire twisting process of the reinforcing bar binding machine, wherein FIG. 12A is a plan view of the binding wire guide device, and FIG. 12B is a side view of the reinforcing bar binding machine.
13A and 13B show a binding wire releasing process of the reinforcing bar binding machine, in which FIG. 13A is a plan view of the binding wire guide device, and FIG. 13B is a side view of the reinforcing bar binding machine.
FIG. 14 is an exploded plan view showing another embodiment of a binding wire clamp device.
FIG. 15 is a plan sectional view showing another embodiment of a binding wire clamp device.
FIG. 16 is a side view of a mechanical unit of a reinforcing bar binding machine according to another embodiment.
[Explanation of symbols]
1 Binding wire clamp device
2 Center clamp plate
3 Right clamp plate
4 Left clamp plate
5 sleeve
9. 10 Groove cam
11.12 Guide pins
13 Ball screw shaft
14 Stopper section
18 Shifter plate
19 Binding wire cutting device
20 Binding wire guide device

Claims (1)

A bundling wire feed mechanism that feeds the bundling wire in a loop and winds it around the rebar, and a bundling wire wound around the rebar is gripped by a gripping means such as a hook, and the bundling wire is twisted by rotating the gripping means An electric rebar binding machine equipped with a binding wire twisting mechanism for binding rebars ,
A gripping means is constituted by the central clamp plate and the open / close clamp plates arranged on the left and right sides thereof, and the binding wire sent out by the binding wire feed mechanism is passed between the central clamp plate and the left or right clamp plate. In the reinforcing bar binding machine configured to hold the binding wire loop by closing the left and right clamp plates after introducing the leading end of the sent binding wire loop between the central clamp plate and the other clamp plate ,
The left and right clamp plates are formed by forming a slope or protrusion over the upper or lower end surface of the center clamp plate during clamping, and bending the binding wire when clamping the binding wire,
The sloped portion or convex portion of the right clamp plate is a sloped or convex portion that approaches from the upper and lower intermediate portions of the inner surface of the right clamp plate toward the center, and the sloped portion or convex portion of the left clamp plate Is a rebar tying machine characterized in that the lower clamp from the upper and lower middle part of the inner surface of the left clamp plate is a slope or a convex part approaching the center.

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