JPH10252270A - Reinforcement binder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive steel wires easily so as to eliminate a binding failure by providing a tapered slit at the tip of a rotating member for twisting the steel wires for binding reinforcements or the like, and feeding the tip of the steel wires into guide members through the tapered slit. SOLUTION: A binding part 30 of a binder 10 is inserted in an intersection part of a longitudinal reinforcement 12 and horizontal reinforcement 14 so as to bring the intersection part into contact with a positioning member 31. When a trigger 28 is pulled, a first driving means (steel wire feed motor) is actuated to feed a steel wire 16 into a pair of guide members 36, and the steel wire 16 is guided around the reinforcement intersection part to form a loop of a plurality of turns. At the time of winding a plurality of times, the steel wire tip is guided by a tapered slit 128 at the tip of a rotating member 38. When the steel wire 16 reaches the specified length, the feed motor is stopped. The loop steel wire is held by the tip of a twisting means 38 (rotating member), and the motor is rotated to bind. The twisting means 38 is stopped after rotating clockwise specified times or for the specified time. The steel wire can therefore be received positively even in case of the tip of the steel wire being displaced at the time of forming the loop.

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 a plurality of rebars at a binding portion with an iron wire, and more particularly to a reinforcing bar binding machine for securely receiving an iron wire into a slit of a twisting means.

[0002]

2. Description of the Related Art In a construction site of a reinforced concrete structure, a production site of a reinforced concrete cage for a reinforced concrete pipe, and the like, a work of binding a plurality of reinforcing bars with an iron wire at an intersection thereof is performed.

[0003] As one of the devices used for this type of binding work, an iron wire is fed toward a binding portion, and the fed iron wire is wound by a pair of arc-shaped guides around a reinforcing bar to be bound in a loop. There is a portable rebar binding machine that guides along a curved path around the rebar to form a plurality of turns of a wire loop and twists (twists) the wire loop with twisting means (twisting means). JP-B-2-29409, JP-A-5-3494).

[0004] In the conventional reinforcing bar binding machine, the twisting means is:
A slit for passing an iron wire is formed at the tip of the rotating shaft. The slit has a U-shaped cross section formed in a slit shape from the front end side to the rear end side of the rotating shaft, and has a width slightly larger than the diameter of the iron wire.

However, since the iron wire is usually curved in an arc shape by the guide means and formed into a loop of a plurality of turns,
In the slit shape of the conventional reinforcing bar binding machine, if the tip of the iron wire sent toward the slit is displaced in the width direction of the slit with respect to the slit, the tip of the iron wire cannot be received by the slit. As described above, if the tip of the iron wire is not received in the slit, a correct multiple-turn iron wire loop is not formed, so that the iron wire loop cannot be twisted by the twisting means, resulting in poor binding.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to ensure that the tip of an iron wire is received in a slit of a twisting means.

[0007]

According to the present invention, there is provided a rebar tying machine for feeding an iron wire to a binding portion for binding a rebar with the iron wire, and a guiding device for guiding the iron wire fed to the binding portion around the rebar. And twisting means rotated around an axis of rotation intersecting with the rebar for twisting the iron wire guided around the rebar by the guide means, and driving means for driving the twisting means. The twisting means includes a rotating shaft that is rotated by the driving means, and a slit formed at the tip of the rotating shaft that allows the passage of an iron wire. The slit has a tapered portion that is wider at the iron wire entrance side at the iron wire entrance portion that receives the iron wire.

[0008] The iron wire is fed into the slit and the guide means by the iron wire feeding means. The leading end of the iron wire passes through the guiding means from the slit, passes through the slit again from the guiding means, and reaches the guiding means again from the slit. Thereby, the iron wire is formed into a multi-turn loop around the reinforcing bar. Even if the tip of the iron wire fed into the slit is slightly displaced in the width direction of the slit with respect to the slit, the slit has a tapered portion at the iron wire entrance that widens toward the entrance of the iron wire, so the tip of the iron wire is securely received by the slit Can be

According to the present invention, since the tapered portion that becomes wider toward the iron wire entrance side is formed at the iron wire entrance portion of the slit, the tip of the iron wire is slightly displaced in the width direction with respect to the slit when the iron wire is fed into the slit. Even so, it is reliably accepted by the slit.

[0010] In a preferred embodiment, the twisting means further comprises a hook for hanging an iron wire on the tip of the rotating shaft and opening and closing the tip of the slit. Further, the slit is opened on the tip end side of the rotation shaft and on both sides in the diameter direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 to FIG. 3, a reinforcing bar binding machine 10 is used as a reinforcing bar binding machine for binding reinforcing bars 12, 14 shown in FIG. The reinforcing bars 12 and 14 may be vertical bars for concrete piles, concrete structures and the like and spiral bars and hoop bars wound around them, or intersecting vertical bars for reinforced concrete structures and reinforced concrete panels and the like. Other rebars, such as streaks and horizontal streaks, may be used.

The rebar tying machine 10 includes support means, that is, a main body 18 for supporting various mechanisms. The main body 18 is formed by a two-part frame 20 connected in a state of being superposed by a plurality of screws. Both frames 20
Work together to support the various means described later of the reinforcing bar binding machine 10 and form a grip portion 22 for a user to grip. The reinforcing bar binding machine 10 is portable, can be operated manually, and can be used at any location such as a factory or a work site.

The rebar tying machine 10 is detachably mounted so that the handle extends in a direction substantially perpendicular to the grip portion 22 (a direction perpendicular to the paper in FIG. 1) so that it can be operated with both hands. For example, the mounting portion may be provided on one or both side walls in the width direction (thickness direction) of the frame 20.

A battery 24 for supplying electric power to the reinforcing bar binding machine 10 is detachably mounted on the frame 20 so that the battery 24 does not fall off the grip portion 22. The power source of the reinforcing bar binding machine 10 is not limited to the battery,
A power supply such as a commercial power supply or a generator that supplies power via electric wires may be used.

A power switch 26 and a trigger 28 are further disposed on the frame 20. The power switch 26 switches the reinforcing bar binding machine 10 between an operable ON state and an inoperable OFF state. The binding of the rebar is started by pulling the trigger 28.

The rebar tying machine 10 also has an iron wire feeding mechanism for feeding the iron wire 16 to the tying portion 30, that is, the iron wire feeding means 3.
2, a first drive mechanism for driving the iron wire feeding means, that is, a first drive means 34, and a guide mechanism or guide means 36 for guiding the iron wire 16 fed into the binding portion 30 around the reinforcing bars 12, 14. , The rebar 12,1
Twisting means or twisting means 3 rotated about an axis intersecting the rebar to twist an iron wire 16 guided around 4
8 and a second driving mechanism for driving the twisting means, that is, a second driving means 40.

At the time of binding, the rebar binding machine 10 operates with the rebar 1 in a state where the power switch 26 is turned on.
Moved toward the intersection of 2,14
Is received into the binding portion 30 from the opening of the guide means 36, and the reinforcing bars 12 and 14 are
1 is maintained. The positioning member 31
It is attached to the frame 20 at a position facing the binding unit 30 and near the tip of the twisting means 38.

When the trigger 28 is pulled, first, the first driving means 34 is driven. Thereby, the iron wire feeding means 32 is driven, and the iron wire 16 is sent to the binding unit 30. When the fed iron wire 16 reaches a predetermined length, the first driving means 3
4 is stopped, and the feeding of the iron wire 16 by the iron wire feeding means 32 is stopped. The iron wire 16 sent to the binding unit 30 is guided around the reinforcing bars 12 and 14 by the guide means 36,
It is formed in a loop 16a of two or more turns (see FIGS. 12 and 13).

Next, the second driving means 40 is connected to the twisting means 38.
Is driven to rotate forward. Thereby, the twisting means 38 is rotated after drawing the loop of the iron wire 16 in the direction of the rotation axis of the twisting means 38 with the loop of the iron wire 16 hung on the tip, or while pulling the loop. The twisted iron wire portion is formed naturally by the loop of the iron wire 16 being twisted to a predetermined strength, or when the rebar binding machine uses the rebar 12,1.
4 is released from the twisting means 38.

When the twisting means 38 is rotated forward a predetermined number of times or for a predetermined time, the second driving means 40 is driven to reverse the twisting means 32. Thereby, the twisting means 38 is reversed. When the twisting means 38 is reversed and returns to the initial position, the second driving means 40 is stopped.

The binding of the reinforcing bars 12 and 14 by the iron wire 16 is as follows.
The above operation is performed as one cycle.

The first driving means 34 is formed by an electric motor 42, a plurality of gears 43, 44, 45 for transmitting the rotation of the electric motor to the iron wire feeding means 32, and a sensor 46 for counting the number of rotations of the gear 44. Have been. The gear 43 is a motor 4
2 is attached to the output shaft. The gears 44 and 45
It is mounted on a shaft 48 rotatably received on the frame 20 by bearings 47. The sensor 46 is a magnetic sensor that senses a magnet 49 provided on the gear 44.

As shown in FIGS. 3 to 8, the iron wire feeding means 32 includes first and second rollers 50 and 52 rotated by the first driving means 34, and the first and second rollers. First and second brackets 54, 56 rotatably supporting the first and second rollers 42, 4 with respect to the first bracket 54, respectively.
4 includes a position switching mechanism or a position switching means 58 for displacing the iron wire 16 between a position where the iron wire 16 is sandwiched and a position where the iron wire 16 is not sandwiched.

First and second rollers 50 and 52
Are attached to one ends of shafts 51 and 53 rotatably received on first and second brackets 54 and 56, respectively, and have outer peripheral surfaces subjected to parallel knurling. The rotation of the first driving means 32 is transmitted to a gear 55 attached to the other end of the shaft 51.
The gear 55 meshes with the gear 45 at the last stage of the first drive means 34 and with a gear 57 attached to the other end of the shaft 53.

The first bracket 54 includes a pair of bolts 6.
0 means that it is immovably attached to the frame 20 by a plurality of screw members. The second bracket 56 is attached to the first bracket 54 by a pair of guide pins 62,
And the direction in which the second rollers 50, 52 sandwich the iron wire 16 and the direction in which they do not sandwich the iron wire 16 (the first and second brackets 54, 52).
56 are mounted so as to be movable in the directions of coming and going.

The position switching means 58 is disposed between the rod 64 and the second bracket 56, the rod 64 having a distal end screwed into the first bracket 54 through the frame 20 and the second bracket 56. Compression coil spring 66 and the first bracket 56
And a knob 68 that is displaced with respect to.

The spring 66 is configured so that the second roller 44
Is pressed against the first roller 42 so as to press the second bracket 56 toward the first bracket 54. Second
The pressing force of the spring 66 to the bracket 54, that is, the urging force, can be adjusted by the amount of screwing of the rod 64 into the first bracket 54.

As shown in FIGS. 1, 2 and 3, the iron wire 16 is fed from a reel 70 mounted on the frame 20 via an iron wire feed guide 72 to the first and second rollers 50 and 5.
You will be guided between the two. The reel 70 and the guide 72 are exchangeably mounted on the frame 20. The part of the guide 72 on the iron wire entrance side and the part on the iron wire exit side are thicker than the central part.

As shown in FIG. 3, the portion 74a of the guide hole 74 (see FIG. 3) of the force (clamping force) for sandwiching the iron wire 16 between the rollers 50 and 52 on the iron wire entrance side has a diameter dimension as shown in FIG. The shape is larger on the side. For this reason, when attaching the iron wire 16 to the binding machine 10 such as when starting to use the rebar binding machine 10 or replacing the reel 72,
Can be easily inserted into the guide hole 74 in a short time.

The first and second rollers 50 and 52 are provided with gears 55 and 55 meshed with each other as shown in FIGS.
It is rotated synchronously by 57. Thereby, the iron wire 16
Is sent to the binding unit 30 by the rollers 50 and 52.

The force (clamping force) between the rollers 50 and 52 for pinching the iron wire 16 is adjusted by adjusting the resilience of the spring 66 and the amount of screwing of the rod 64 into the first bracket 64. Is adjusted to a value that does not cause slippage between the iron wire 16. Therefore, the rod 64 and the spring 66 function as pinch pressure adjusting means for adjusting the clamping force between the rollers 50 and 52 with respect to the iron wire 16.

As shown in FIG. 7, the knob 68 has a hub portion and a handle portion extending in a flange shape at one end of the hub portion. The knob 68 also extends through the hub and has
The second bracket 56 is rotatably mounted on the second bracket 56 by a screw rod 78 screwed into the bracket 56.

The hub and the frame 20 are respectively
It has a plurality of projections 80 and 82 that are releasably abutted. Each of the projections 80 and 82 is
The protrusions 80 and 82 are spaced around the circumference of the gear 8 such that the protrusions 80 and 82 can mesh with each other like gear teeth. FIG. 8 shows an example of the projection 82 provided on the frame 20 side. The protrusion 80 on the knob 68 side has the same shape.

In a state where the projections 80 and 82 do not abut each other (a state where they do not engage with each other), the second bracket 56 is always pressed against the first bracket 54 by the spring 66 as shown in FIG. And therefore knob 68
Is always pressed by the main body 20. In this state,
The second bracket 56 is different from the first bracket 54 in that
The rollers 50 and 52 are displaced to positions that sandwich the iron wire 16.

In the above state, the knob 68 is pulled, and the knob 68 is moved to the position where the projections 80 and 82 face each other.
After rotating angularly around 8 and releasing knob 68,
The position switching means 58 is maintained in a state where the protrusions 80 and 82 are abutted. At this time, the second bracket 56
7B, the rollers 50 and 52 are displaced with respect to the first bracket 54 so that the rollers 50 and 52 do not sandwich the iron wire 16. Thereby, a gap is formed between the rollers 50 and 52.

In the state shown in FIG.
After turning the knob 68 angularly around the screw rod 78 until the protrusions 80 and 82 do not oppose each other.
When the knob 68 is released, the position switching means 58 causes the protrusions 80 and 8 to move.
2 is maintained in a meshing state (a state in which the projections 80 and 82 are adjacent to each other around the rod 78). At this time, as shown in FIG. 7A, the second bracket 56 is displaced with respect to the first bracket 54 to a position where the rollers 50 and 52 sandwich the iron wire 16.

Therefore, the knob 68 of the position switching means 58
7B is displaced as shown in FIG. 7B, the iron wire 16 can be fed from the guide 72 between the rollers 50 and 52, and the iron wire 16 sandwiched between the rollers 50 and 52 can be 50, 52 can be withdrawn. Further, the knob 68 is moved from the state shown in FIG.
(A) The iron wire 16 is displaced as shown in FIG.
Between the rollers 50 and 52.

As shown in FIGS. 9 and 10, the guide means 36 includes first and second guides 92 and 94 forming the binding portion 30. First and second guides 92, 9
4 is a support member 90 attached to the distal end of the main body 18 at an interval from the rotation axis of the twisting means 38.
It is detachably attached to.

The supporting member 90 has a hole 95 for guiding the iron wire 16 fed from the iron wire feeding means 32 to the binding portion 30. The hole 95 penetrates the support member 90 from the side of the iron wire feeding unit 32 to the side of the binding unit 30. The hole 95a on the entrance side of the iron wire is used to set the iron wire 1 when the iron wire 16 is set.
6 is formed in a conical shape that becomes wider toward the iron wire entrance side so as to easily receive the tip. The iron wire 16 is fed into the binding unit 30 through the hole 95 by the iron wire feeding means 32.

First and second guides 92 and 94
Have first and second guide grooves 96 and 98, respectively, extending in an arc so as to form the binding portion 30. The first and second guide grooves 96 and 98 respectively have inlet portions 102 and 104 into which the iron wire 16 is fed,
It has outlet portions 106 and 108 from which the iron wire 16 is fed. The first guide groove 96 is, as shown in FIG.
At least the inlet portion 102 is a tapered portion that is larger toward the binding portion 30.

The first and second guides 92 and 94 are non-displaceable and detachable from the support member 90 by the fixing pin 100 with the first and second guide grooves 96 and 98 facing each other. Installed. Each fixing pin 100 is preferably a threaded pin having an external thread that is screwed to the support member 90,
It may be a normal pin that fits into the connector.

The iron wire 16 sent to the binding portion 30 is first guided to the first guide 92, and at the entrance portion 102 of the first guide groove 96, as shown in FIG.
2 a pin 110 provided across the first groove 96
And the first guide groove 96, the pin 1 of the first guide groove 96
While being bent to the same curvature as the curvature near 10, it is moved to the outlet portion 106 along the first guide groove 96.

The second guide groove 98 is formed at a position displaced from the first guide groove 96 toward the distal end in the direction of the rotation axis 118 of the twisting means 38. Therefore, the first
The iron wire 16 that has been moved in the guide groove 96 and passed through the opening between the tips of the guides 92 and 94 is
8 is securely received in the inlet section 104.

The radii of curvature of the guide grooves of the two guides 92 and 94 may be the same or different. In the rebar bundling machine 10, since the space between the two guides 92 and 94 is always open, the curvature of the guide groove 96 of the first guide on the side that first receives the iron wire 16 is calculated from the curvature of the guide groove 98 of the second guide. I'm making it smaller. Thereby, the guide groove 96 having a small radius of curvature is provided.
Is reliably received in the guide groove 98 having a large radius of curvature, and is surely deformed into a loop 16a around the reinforcing bars 12, 14.

The radius of curvature of the exit portions 106 and 108 of the guide grooves of the guides 92 and 94 is smaller than the radius of curvature of the entrance portions 102 and 104, respectively. As a result, the iron wire 16 sent from the first guide groove 96 to the second guide groove 98 is bent to a smaller curvature by passing through the outlet portion 106, and the entrance portion 104 having a larger curvature.
Surely accepted.

Iron wire 1 received in second guide groove 98
6 is moved from the inlet portion 104 to the outlet portion 108,
From the outlet part 108, it is sent out again to the first guide groove 96. Also at this time, the second guide groove 98 of the iron wire 16 is
Is displaced to the distal end side with respect to the guide groove 96, and is bent to a radius of curvature smaller than the radius of curvature bent near the pin 110, so that the first guide groove 96 is securely received. Can be

As a result, as shown in FIG. 12, a loop 16a of plural turns of iron wire is formed. Reinforcing bars 12, 14
The number of loops of the iron wire 16 formed around the binding portion 30 can be about 2 to 6, and a preferable value is 2 or 3. The number of loops of the iron wire differs depending on the thickness of the reinforcing bar to be bound, the diameter of the loop 16a, the length of the iron wire fed in one bundling, and the like. As the number of loops of the iron wire increases, the reinforcing bar can be strongly bound, but on the other hand, the amount of iron wire used increases, and the time required for one binding increases.

The length of the iron wire fed to the binding portion 30 in one bundling is determined by the size of the two rollers 50 and 52 of the iron wire feeding means 32, the rotation speed of the first drive means 34, and the first drive means 3
4 can be changed by the rotation time or the like.

By changing the rotation speed or rotation time of the first driving means 34, the rebar tying machine 10 adjusts the feed speed or the feed time of the iron wire in one bundling, and adjusts the iron wire of a predetermined length. It is preferable to provide a means for supplying to the binding portion.

To do so, for example, values corresponding to the feeding speed, feeding time, etc. of the iron wire are set by a variable resistor, a setting device, or the like, and control is performed so that the speed or time corresponds to the value. In the circuit, the first driving means 34 may be controlled.

More specifically, a setting device for setting the required feed amount of the iron wire in one bundling is provided in the main body 18, and a sensor for measuring the number of rotations of the first driving means 34 or the first roller 50 is provided. It may be arranged on the main body 18 and stop the first driving means 34 when the sensor measures a predetermined number of revolutions. In the embodiment shown, the sensor 46 shown in FIG.
Corresponds to the sensor. In this way, the feed amount of the iron wire can be set to the set value.

The diameter of the iron wire loop 16a formed by the guide grooves 96 and 98 of both guides can be changed by replacing one or both guides. One of the guides 92 and 94 may be non-exchangeably arranged, and the other may be exchangeably arranged. If the guide is replaceable,
You can select and replace guides that match the size of the reinforcing bars to be bound.

When the iron wire 16 having a predetermined length is sent to the binding portion 30 and the loops 16a are formed by the guides 92 and 94, the first driving means 34 is stopped to stop the rotation of the rollers 50 and 52. , Instead of loop 1 of iron wire 16
The second driving means 40 for driving the twisting means 38 for twisting 6a is driven.

As shown in FIG. 3, the second driving means 40
Is formed by an electric motor 112, a planetary gear reduction mechanism 114, and an output gear 116. Reduction mechanism 114
Reduces the rotation of the electric motor 112 and transmits it to the output gear 116.

As shown in FIG. 3, the twisting means 38 includes a second
The gear 11 is meshed with the output gear 116 of
6, a rotating shaft 122 movably coupled to the gear 120 in the direction of the rotating axis 118.
A slider 124 slidably coupled to the tip of the rotation shaft 122 in the direction of the rotation axis 118, and a hook 126 disposed at the tip of the rotation shaft 122.

As shown in FIGS. 10, 11 and 12, the gear 120 is received on the frame 20 by the bearing 127. The tip of the rotating shaft 122 is
Is formed by a bifurcated member having a slit 128 for passing an iron wire fed into the binding portion 30 through a hole 95 provided in the first and a second guide groove 98 from the first guide groove 96. . The slit 128 is provided on the rotating shaft 12.
2 has a U-shape that is open to the distal end side and the outer peripheral side.

The entrance portion of the slit 128 which receives the iron wire 16 sent from the exit portion of the second guide groove 98 has a tapered portion 129 (see FIG. 11) so that the iron wire 16 can be easily received in the slit 128. Have been. The tapered portion 129 is formed so as to become wider toward the hole 95 when viewed from the tip side in the direction of the rotation axis 118.

The twisting means 38 also crosses the slit 128 in the width direction of the slit 128 so as to cover the opening of the slit 128 at the distal end of the rotary shaft 122 so as to cover the opening of the slit 128. An extending hook 126 is provided. The hook 126 has a shape that becomes gradually thinner from a portion on the side of the base end portion toward the tip side.
28 is supported by a pin (not shown) at the base end of the rotating shaft 122 so as to be openable and closable.

The slider 124 is constantly urged to the distal end side by a compression coil spring 131 disposed around the rotation shaft 122 to move the base end of the hook 126 forward (of the binding portion 30).
Pressing to the side. As a result, the hook 126 is constantly urged to a position where the slit 128 is closed. The spring 131 is disposed between the position adjusting nut 133 screwed to the rotation shaft 122 and the slider 124. When the iron wire 16 is formed in the loop 16a, the slit 12
8, the loop 16a is formed around the reinforcing bars 12, 14 and the hook 126 as shown in FIG.

The gear 120 and the rotating shaft 122 are
When the gear 20 is rotated forward, the rotating shaft 122 is retracted, and when the gear 129 is rotated reversely, the rotating shaft 122 is moved forward by a coupling means.

Such connecting means are shown in FIGS.
In the example shown in FIG. 5, the first groove 130 is provided at the rear portion of the rotating shaft 122, and the ball 132 is provided inside the gear 120 and slidably received in the first groove 130. As shown in FIG. 15, the first groove 130 is provided substantially around the outer circumference of the rotation shaft 122 such that one end and the other end thereof are separated in the direction of the rotation axis 118. The ball 132 is rotatably provided at a predetermined position inside the gear 120.

When the gear 120 is rotated by the second driving means 40, the rotation shaft 122 and the ball 132 relatively slide in the direction of the rotation axis 118. Therefore, the gear 1
When the wheel 20 is rotated forward, the ball 132 causes the rotation shaft 122 to move backward with respect to the gear 120 in the direction of the rotation axis 118.
On the other hand, when the gear 120 is reversed, the ball 132
Moves the rotating shaft 122 forward in the direction of the rotating axis 118 with respect to the gear 120.

At this time, the rotation of the rotating shaft 122 is limited by a torque limiter 134 shown in FIG. 16 so that the rotating shaft 122 does not rotate with the gear 120 when the rotation of the gear 120 starts. The tri-limiter 134 includes a receiving member 136 through which the rotating shaft 122 rotatably passes, a screw hole 138 formed in the receiving member 136, a ball 140 disposed in the screw hole 138, and a stopper screwed into the screw hole 138. Screw 142
And ball 140 and stop screw 1 in screw hole 138
42, and a second groove 146 formed in the rotation shaft.

The screw hole 138 reaches the hole through which the rotating shaft 122 passes. The ball 140 is
4 is pressed by the second groove 146 and is engaged with the rotating shaft 122. The second groove 146 is a linear groove extending in the direction of the rotation axis 118, and has an arc-shaped cross section having a radius of curvature substantially equal to the radius of the ball 140.

The torque limiter 134 does not allow the rotation of the rotary shaft 122 until the torque acting on the rotary shaft 122 reaches a value that causes the ball 140 to retract into the screw hole 138 against the force of the spring 144, that is, the set torque. However, when the torque exceeds the set torque, the rotation of the rotating shaft 122 by the gear 120 is permitted. The set torque of the torque limiter 134 is
4 and can therefore be adjusted by changing the amount of screwing of the stop screw 142 into the screw hole 138.

As shown in FIG. 15, the ball 1
When 32 goes around from one end to the other end of the first groove 130,
The rotating shaft 132 is connected to the first groove 13 together with the hook 126.
0 is retracted by the distance H in the direction of the rotation axis 118 between the one end and the other end, that is, the lead of the first groove 130. Therefore, as shown in FIG. 13, the hook 126 is pulled in the direction of the rotation axis 118 with the loop 16a hooked. Thereby, the gap between the loop 16a and the reinforcing bars 12, 14 can be eliminated.

When the gear 120 rotates forward, the rotation torque acting on the rotation shaft 122 exceeds the set torque of the torque limiter 134 during or around the time when the ball 132 makes a circuit around the first groove 130. Thereby, the gear 120
Is transmitted to the rotation shaft 122, and the rotation shaft 122 is rotated. Further, at the start of rotation of the rotating shaft 122, the iron wire 16 is cut by the cooperative action of the entrance portion of the slit 128 of the rotating shaft 122 and the hole 95 formed in the support member 90 for feeding the iron wire.

When the rotation shaft 122 is rotated forward, the hook 12
6 is a state in which the rotation axis 118 is engaged with the loop 16a.
Twisted around the wire loop, being rotated around. Loop 16
While twisting a, the tip of the hook 126
Has been accepted. Therefore, the loop 16a can be reliably twisted. In addition, since the rotational moment acting on the hook 126 during binding is reduced, the hook 126
And the strength of attachment of the hook 126 to the head 124 can be reduced.
Structure can be simplified.

As shown in FIG. 14, while the rotating shaft 122 is rotated forward, the extra portion of the loop 16a is twisted and the twisted portion 16b is twisted more densely, so that the twisted portion 16b gradually becomes twisted. Be shorter. As a result, a force that pulls the hook 126 toward the reinforcing bars 12 and 14 acts on the hook 132, so that the hook 126 is gradually displaced with respect to the rotating shaft 122 so as to open the slit 128, and finally the iron wire is twisted. The released portion 16b is released. Thereby, the loop 16a is twisted more accurately and reliably than the conventional reinforcing bar binding machine.

The twist of the iron wire 16 is monitored by a sensor 148 that detects the rotation of the gear 120. Sensor 148
Is a magnetic sensor that detects a magnet 150 disposed on the rear surface of the gear 120 in the illustrated example. Sensor 14
8 is transmitted to the gear 1 by a control circuit (not shown).
It is used as a signal for determining whether or not the number of rotations of 20 has reached a predetermined value. When the gear 120 rotates forward a predetermined number of times, a signal for stopping the electric motor 112 of the second drive means 40 is generated, the electric motor 112 is stopped, and the rotating shaft 122 is stopped.

The control of the twist of the iron wire 16 is not limited to counting the number of rotations of the gear 120 by a sensor, but may be of counting the number of rotations of the rotating shaft 122. Gear 120 or rotating shaft 1
The rotation time of 22 may be set by a timer.

When the electric motor 112 and the rotary shaft 122 are stopped, the twisted portion 16b
6, the rebar tying machine 10 is reinforced so that the twisted portion 16b is removed from the hook 126.
You just have to pull it away from 4.

The motor 112 of the second driving means 40 is then reversed. Thus, the rotating shaft 122 is advanced in the direction of the rotating axis 118 by the cooperative action of the first groove 130 and the ball 140. This is because the ball 132 at one end of the first groove 130 slides around the rotary shaft 122 once again in the first groove 130 and slides to the other end with the reverse rotation of the gear 120. It is. Thereby, the rotating shaft 122 is advanced to the initial position, which is the position where the twisting of the iron wire 16 has started. To advance the rotating shaft 122 to the initial position, the gear 120 may be reversed once.

Between the rotating shaft 122 and the frame 20,
Origin checking means for detecting that the rotating shaft 122 has reached the initial position is provided. The origin checking means includes a sensor 152 provided on the frame 20 and the rotation shaft 122.
And a magnet 154 that is immovably attached to the

When the sensor 152 detects the magnet 154 during the reverse rotation of the rotating shaft 122, the motor 112 of the second drive means 40 is stopped to stop the forward movement of the rotating shaft 122. The origin checking means may arrange the sensor 152 on the rotating shaft 122 and the magnet 154 on the support member of the twisting means 38, and the origin checking means may detect the magnet 154 and the sensor 152 for detecting the magnetic force of the magnet. It does not have to be a combination of.

The first groove 130 and the ball 132, which are means for connecting the gear 120 and the rotating shaft 122,
0, the first groove 130 is arranged, and the ball 1 is
32 can be arranged. The length of the first groove 130 can be changed according to the size of the gap generated between the iron wire 16 and the reinforcing bars 12 and 14. The ball 13
Instead of 2, other members may be used that engage the first groove 130 and are slidably received in the groove.

As another embodiment of the connecting means for connecting the gear 120 and the rotary shaft 122, means shown in FIG. 17 can be used. This coupling means causes the rotating shaft 122 to rotate forward while retracting when the gear 120 rotates forward, and causes the rotating shaft 122 to rotate forward while rotating backward when the gear 120 rotates backward. The rotary shaft 122 has a rear end
Is inserted inside.

The connecting means shown in FIG.
A sliding key 170 is immovably attached to the rotating shaft 122 so as to allow the rotating shaft 122 to move in the direction, and a key groove 172 formed in the gear 120 to receive the sliding key 170. The rotation shaft 122 has a male screw portion 176 that is screwed with a nut 174 that is immovably arranged on the frame 20.

When the gear 120 is rotated forward by the second driving means 40, the rotation of the gear 120 is transmitted to the rotating shaft 122, and the rotating shaft 122 rotates. At this time, the rotating shaft 122
Rotates with respect to the nut 174 in a state where the male screw portion 176 is screwed with the nut 174, so that the rotation shaft 122 rotates forward with respect to the gear 120 while retracting in the direction of the rotation axis 118.

When the rotating shaft 122 rotates forward while moving backward,
Similarly, the hook 126 attached to the tip is rotated while retracting, so that the hook 126 twists while hooking the loop of the iron wire and pulling in the direction of the rotation axis 118.
Therefore, a gap between the loop of the iron wire and the reinforcing bar can be eliminated while twisting the iron wire.

The twist of the iron wire is controlled by a sensor 148 that counts the number of rotations of the gear 120. When the number of revolutions of the gear 120 reaches a predetermined number, the second driving means 40
Is stopped to stop the rotation of the rotating shaft 122.

Next, when the second driving means 40 is rotated in the reverse direction, the gear 120 is rotated in the reverse direction, so that the rotation of the gear 120 is transmitted to the rotating shaft 122, and the rotating shaft 122 is rotated in the same manner as in the normal rotation. It is reversed while being advanced in the direction of 118.
Thereby, the rotating shaft 122 returns to the initial position.

The present invention is not limited to the above embodiment. For example, the present invention is applicable not only to a portable rebar binding machine, but also to other rebars such as a rebar binding machine that is installed and used immovably in a factory or the like, a rebar binding machine that is installed and used in a factory or the like. The present invention can also be applied to a binding machine.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a reinforcing bar binding machine according to the present invention.

FIG. 2 is a left side view of the reinforcing bar binding machine shown in FIG. 1;

FIG. 3 is an enlarged view showing a part of a cross section taken along line 3-3 in FIG. 2;

FIG. 4 is a diagram showing an embodiment of an iron wire feeding means.

FIG. 5 is a plan view of the iron wire feeding means of FIG. 4;

FIG. 6 is a right side view of the iron wire feeding means of FIG. 4;

FIGS. 7A and 7B are cross-sectional views taken along line 7-7 in FIG. 6, wherein FIG. 7A shows a state in which the second bracket is displaced to a position where an iron wire is sandwiched between rollers, and FIG. The figure which shows the state which displaced the 2nd bracket to the position which does not pinch an iron wire with a roller.

FIG. 8 is a view showing a projection formed on a frame of the reinforcing bar binding machine.

FIG. 9 is a view showing one embodiment of the guide means, and FIG.
FIG. 7 is a diagram showing a state before the iron wire is fed, FIG. 7B is a diagram showing a state where the iron wire is fed halfway, and FIG. 7C is a diagram showing a state where the iron wire is further fed.

FIG. 10 is an enlarged view showing an embodiment of a tip end portion of the twisting means and a guiding means, showing a slit and a tapered portion formed in the slit.

FIG. 11 is a right side view of FIG. 11, illustrating a cross section of the guide and showing a shape of a guide groove.

FIG. 12 is a view showing an embodiment of the twisting means, showing a state at the time of forming a loop of the iron wire.

FIG. 13 is a view showing a state at the start of the twisting of the iron wire in the twisting means shown in FIG. 12;

FIG. 14 is a view showing a state in which an iron wire is twisted by the twisting means shown in FIG. 12;

FIGS. 15A and 15B are views showing one embodiment of the first groove of the means for connecting the gear and the rotating shaft, wherein FIG. 15A is a front view and FIG. 15B is a bottom view.

FIG. 16 is a sectional view showing an embodiment of the torque limiter.

FIG. 17 is a view showing another embodiment of the means for connecting the gear and the rotating shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rebar bundling machine 12,14 Rebar 16 Iron wire 18 Main body 20 Frame 30 Binding part 32 Iron wire feeding means 34 First driving means 36 Guide means 38 Twisting means 40 Second driving means 42 First electric motor 50,52 First and Second roller 54, 56 First and second bracket 58 Position switching means 64 Screw rod 66 Spring 68 Knob 92, 94 First and second guide 96, 98 First and second guide groove 102, 104 First Inlet portions of the first and second guide grooves 106, 108 Outlet portions of the first and second guide grooves 120 Gear 122 Rotary shaft

Claims (3)

[Claims] 1. An iron wire feeding means for feeding an iron wire to a binding portion for binding a reinforcing bar with the iron wire, a guiding means for guiding the iron wire fed to the binding portion around the reinforcing bar, and the reinforcing bar by the guiding means. Twisting means rotated around a rotation axis intersecting with the rebar to twist the iron wire guided around, and driving means for driving the twisting means, wherein the twisting means is driven by the driving means. A rotating shaft to be rotated, and a slit formed at the tip of the rotating shaft, the slit allowing passage of the iron wire, and the slit is tapered toward the iron wire inlet side for receiving the iron wire, the taper being wider toward the iron wire inlet side. Rebar tying machine with a part. 2. The rebar tying machine according to claim 1, wherein the twisting means further comprises a hook for hanging the iron wire on a tip end of the rotating shaft, the hook opening and closing the tip of the slit. 3. The rebar tying machine according to claim 1, wherein the slit is open to a front end side and a diametrical side of the rotating shaft.