JPH0362496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reinforcing bar tying machine for tying together a plurality of reinforcing bars that cross each other, such as vertical and horizontal bars of a reinforcing bar niche, with iron wire.

(Prior Art) Japanese Patent Application Laid-open No. 62-270238 discloses a reinforcing bar binding machine for binding a plurality of reinforcing bars that intersect with each other using iron wire at their crossing points. This reinforcing bar tying machine includes a means for feeding the iron wire into a tying part, a guide means having a guide path for guiding the iron wire fed into the tying part along a curve surrounding the reinforcing bars to deform the iron wire into a loop shape, and The invention includes means for twisting the reinforcing bars by being rotated while being engaged with the reinforcing bars that have been twisted, and a driving means for rotating the twisting means.

The twisting means includes a rotating body that has a slot through which the iron wire fed into the binding section can pass and is rotated by a driving means around an axis extending in a direction intersecting the axial direction of the loop; and the rotating body. a pair of pins supported so as to be relatively movable in the axial direction of the loop so that their one ends face each other, and a pressing force that abuts the pins against each other with their opposite ends; and a pressing mechanism that acts on one pin.

One end of the pin is a hemisphere, a cone,
It has a shape such as a truncated cone, so that during twisting, when the iron wire is rotated while being engaged with one end of the pin, a force that separates the pins from each other acts on the pins.

When tying reinforcing bars, the tying machine is arranged so that the part of the reinforcing bars to be tied is within the tying section. Next, the iron wire is fed into the binding section. As a result, the iron wire is guided so as to wrap around the abutted pins and the reinforcing bars to be bound, and is deformed into a loop shape. Thereafter, the twisting means is rotated with the pins butted against each other.

As a result, the iron wire is cut into a loop-shaped part in the binding part and a part behind it by the rotation of the rotating body, and when the pin is engaged with the loop-shaped part of the iron wire, the axis that intersects with the axis of the pin as a result of which the looped sections of iron wire are twisted. When the iron wire is twisted by a predetermined amount, the engagement between one end of the pin and the iron wire causes the pins to be separated from each other against the pressing force of the pressing mechanism, and the engagement between the pin and the iron wire is released, completing the bundling work. do.

(Problem to be Solved) However, in the conventional tying machine, even when the iron wire is twisted by a predetermined amount, the engagement between the pin and the iron wire does not come off, and as a result, the iron wire is twisted and the twisted part of the iron wire is twisted. In other words, scraps may remain on the pin. The pieces of iron wire remaining on the pins prevent the iron wire from being fed into the binding section during the next binding operation, and as a result, the next binding operation cannot be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire tying machine that can easily remove scraps of iron wire remaining on pins.

(Solution Means, Actions, Effects) The reinforcing bar tying machine of the present invention, which binds reinforcing bars with iron wire in a tying part, includes a means for feeding the steel wire into the tying part, and a means for feeding the steel wire into the tying part, and a means for tying the reinforcing bars to the tying part. a rotating body rotatable around an axis extending in a direction intersecting a direction along the axis of the loop formed by the guide means, which includes a guide path that deforms the circumference into a loop shape, and defines the binding part; and the axis of the loop formed by the iron wire. a rotating body having a slot through which the iron wire fed into the binding part can pass; a driving means for rotating the rotating body; and a part of the rotating body facing the slot through the slot. A pair of pins supported so as to be relatively movable in a direction along the axis of the loop and capable of engaging with the loop-shaped portion of the iron wire, the pins being capable of applying a force such that the pins are separated from each other when the iron wire is twisted. a pair of pins having end portions that are caused to co-exist with the iron wire and arranged such that the end portions face each other;
a pressing means for applying a pressing force to at least one of the pins to abut the pins against each other at the ends; and a pressing means for preventing the pressing force from acting on the pins so as to prevent the pins from moving away from each other. and a release means for permitting.

When the feeding means is actuated, the iron wire is fed into the binding section, guided so as to surround the abutted pins and the reinforcing bars to be tied, and deformed into a loop shape. When the rotating body is rotated in this state, the pin is engaged with the loop-shaped part of the iron wire and rotated around an axis that intersects the axis of the pin, so the loop-shaped part of the iron wire is twisted. . When the iron wire is twisted by a predetermined amount, the abutted ends of the pins and the iron wire separate the pins from each other against the pressing force of the pressing mechanism, and the engagement between the pin and the iron wire is released.

When the release means is actuated, the pins are movable away from each other. Therefore, even if a piece of the twisted iron wire remains on the pin, the piece can be easily removed. The release means may be activated each time the reinforcing bars are tied together, or may be activated only when a piece of iron wire is present.

Preferably, the device includes means for forcibly removing from the pin a piece of iron wire engaged with the pin.
With this, it is possible to automatically remove the piece of iron wire that is engaged with the pin, so the release means and the removal means are activated each time the reinforcing steel is twisted once.
Work efficiency can be increased.

The removing means may be configured to blow compressed air from a nozzle to the abutted portion of the pin when removing the piece of iron wire. This allows the structure of the removing means to be simplified.

The rotating body may include a rotating shaft extending in a direction perpendicular to the moving direction of the pin, and a head having the slot attached to one end of the rotating shaft. In this case, the pressing mechanism includes a receiving seat fixed to the rotating shaft and a slider supported by the rotating shaft so as to be movable in the direction of the rotating axis, and the pressing mechanism is a slider that contacts the pin and moves the pin toward each other. a slider having an end portion that moves the pins toward each other; and a spring that is disposed between the slider and the receiving seat and presses the slider in a direction along the rotation axis to move the pins toward each other.
When the release means is actuated, the slider is pushed toward the receiving seat by the release means against the force of the spring of the pressing mechanism.

The release means includes a cam that is engaged with the slider and is rotatable about an axis perpendicular to the rotational axis, and angularly moves the cam so that the slider is moved against the force of the spring. It can be provided with a drive mechanism for rotating.

(Example) Referring to FIG. 1, a reinforcing bar binding machine 10 is used as a device for bundling reinforcing bars 12 and 14 that intersect with each other at a bundling portion 18 using iron wire 16 in the illustrated example. However, it can also be used as a device for binding multiple reinforcing bars that extend parallel to each other. In the illustrated example, reinforcing bars 12 and 14 are, respectively, longitudinal bars for concrete structures and horizontal bars or hoop bars hung thereon, but may be other reinforcing bars.

The binding machine 10 includes a pedestal 20 installed on the floor or the like by a support (not shown). Frame 20
is a horizontally arranged elongated plate-shaped first member 2
2, a plate-shaped second member 24 fixed to one side edge in the width direction of the first member so as to extend downward from the one side edge, and a first member 24 of the second member. Member 22
A plate-shaped third member 26 fixed to the opposite end so as to extend parallel to the first member 22, and the first member 22, the second member 24, and the third member 26. and a rib member 28 coupled thereto.

The frame 20 supports the jack 30. The cylinder of the jack 30 is attached to the third member 26 so that the direction of expansion and contraction of the jack 30 is the vertical direction. On the other hand, the piston rod of the jack 30 has an arm 32 extending in the horizontal direction.
is connected to.

The arm 32 extends from the rear end of the pedestal 20 to the pedestal 20.
It protrudes forward of the pedestal 20 through the front end of the rod, and is vertically movably fitted into a pair of guide rods 34 fixed to the pedestal 20 so as to extend vertically adjacent to the jack 30 in parallel to each other. There is. The arm 32 has a pair of boss portions 36 that are fitted into the guide rod 34 so as to be movable in the vertical direction.

A pair of annular seats 38, 40 are arranged around each guide rod 34. One of the receiving seats 38 is fixed to the lower end of the corresponding rod 34. On the other hand, the other receiving seat 40 is fitted into the corresponding rod 34 so as to be movable in the vertical direction. Between the receiving seats 38 and 40, the receiving seat 4
A compression coil spring 42 is arranged to move the 0 upward.

A holder 44 is attached to the tip of the arm 32 via a buffer member 46 . As shown in FIG. 2, the holder 44 has a hole 48 passing through it in the vertical direction, and also supports a gear case 50.

As shown in FIG. 2, inside the gear case 50,
A pair of gears 52, 54 meshed with each other, a plurality of timing pulleys 58, 60, 62 connected to each other by a timing belt 56, and two clutches 64, 66 are arranged.

The gear 52 is attached to the rotating shaft of a motor 68 fixed to the gear case 50. gear 54
is non-rotatably attached to a shaft 72 supported by the gear case 50 so as to be rotatable around an axis extending in the vertical direction by means of a plurality of bearings 70.

The timing belt 56 has a large number of teeth extending in the width direction of the endless belt inside the endless belt.
Each of the timing pulleys 58, 60, and 66 has a plurality of teeth on its outer peripheral surface that mesh with the teeth of the endless belt. However, instead of using the timing belt 56 and timing pulleys 58, 60, 62, an endless chain and engaging sprockets or the like may be used.

Timing pulley 58 is non-rotatably attached to shaft 72. timing pulley 6
0 is rotatably attached to a shaft 74 that is rotatably supported by the gear case 50 around an axis extending in the vertical direction by a plurality of bearings (not shown). The timing pulley 62 is rotatably attached to a rotating shaft 78 supported by the gear case 50 so as to be rotatable around an axis extending in the vertical direction by a plurality of bearings 76 . The rotating shaft 78 passes through the gear case 50 in the vertical direction.

Clutch 64 connects shaft 74 to control coupling between timing pulley 60 and shaft 74.
It is located at 4. Clutch 66 is disposed on rotation shaft 78 to control the connection between timing pulley 62 and rotation shaft 78. Shaft 74
is a brake mechanism 8 supported by a gear case 50.
Connected to 0.

The motor 68 rotates from the gear 52 to the gear 5.
4, the timing pulley 6 is connected by the shaft 72, the timing pulley 58, and the timing belt 56.
0,62. timing pulley 60,
Rotation at 62 is not transmitted to the corresponding shaft 74 or axis of rotation 78 unless the corresponding clutch 64, 66 is actuated.

The shaft 74 is connected to a feeding mechanism 82 that feeds the iron wire 16 into the binding section 18. As shown in FIGS. 1 and 2, the feeding mechanism 82 includes a drive gear 84 that rotates as the shaft 74 rotates, and two pairs of rollers 86 that are rotated by the drive gear. It is also disposed on a support wall 88 extending downward from the gear case 50.

The iron wire 16 is wound around a reel 90 supported by the second member 24 of the pedestal 20, and is connected to the feeding mechanism 8.
As the two driving gears 84 are rotated, the wire is pulled out by the pair of rollers 86 via the iron wire measuring mechanism 92 and the plurality of tube-shaped protectors 94, and sent to the binding section 18.

The iron wire measuring mechanism 92 is attached to the rib 28 of the pedestal 20, and the iron wire 16 is attached to the screw 96.
When passing between a pair of rollers 98 that are relatively pressed by the iron wire, the rollers 98 apply a braking action to the iron wire. The roller 98 is rotated as the iron wire 16 is moved. The strong pressure of the roller 98 is
Adjustment can be made using screws 96. One of the rollers 96, for example the lower roller,
It is connected to a rotation amount detector (not shown) via a shaft that supports it. The rotation amount detector includes a detector such as a rotary encoder that generates an electric signal proportional to the amount of rotation of the shaft, and a processing circuit that calculates the amount of iron wire fed out per time based on the output signal of the detector. Equipped with

As shown in FIGS. 2, 5, and 6, the twisting mechanism 100 for twisting the iron wire 16 includes the aforementioned rotating shaft 78 and a bifurcated head 102 screwed onto the lower end of the rotating shaft. and a pair of pins 1 arranged on the head
04.

As shown in FIG. 7, the head 102 has a rotating shaft 7
8, and a pair of branch parts 108 extending downward in parallel from the base part, and the base part 106 and the branch parts 108 define a slot 110 for receiving the iron wire. There is. The head 102 has a pair of grooves 1 extending in the vertical direction.
It has 12. The grooves 112 are formed on the outer peripheral surfaces facing each other with the slots 110 interposed therebetween, and have a U-shaped cross-sectional shape. Each branch 108 has a hole 114 that communicates with a slot 110 and a groove 112 to receive the pin 104 . hole 11
4 are opposed so that they have a common axis.

The pin 104 has a truncated conical end 116 and a conical end 1, one of which is shown in FIG.
18 and also has an end 1 in the corresponding hole 114.
16 are arranged to face each other. The pin 104 has a length dimension such that when the ends 116 are abutted together, the end 118 projects into the corresponding groove 112.

The shape of the end portion 116 of the pin 104 may be hemispherical or conical as long as the force that separates the pin 104 is exerted by the joint action of the iron wire 16 and the end portion 116 when the iron wire 16 is twisted. It may also be of other shapes. Also, the end 1 of one pin 104
16 may be a plane perpendicular to the axis thereof, and the end 116 of the other pin may have a shape such as a truncated cone.

The pin 104 is pressed against the end 1 by the pressing mechanism 120.
16 are butted against each other so that their tips are in contact with each other. The pressing mechanism 120 is shown in FIGS.
As shown in the figure, a receiving seat 122 screwed into a threaded portion formed on the rotating shaft 78, a slider 124 disposed on the rotating shaft 78 so as to be movable in the axial direction of the rotating shaft 78, and a receiving seat 122. A compression coil spring 126 is provided between the slider 124 and the slider 124.

As shown in FIG. 9, the slider 122 includes a ring portion 12 that is slidably fitted to the tip of the rotating shaft.
8, a pair of pressing pieces 130 extending in parallel from the ring portion, and a flange portion 132 provided on the ring portion 128. The slider 122 is positioned such that the pusher piece 130 is slidably received in the corresponding groove 112 of the head 102 and the tip of the pusher 130 contacts the end 118 of the corresponding pin 104 .

The inner surface of the tip of the pressing piece 130 is a tapered surface 134 that applies force to the corresponding pins 104 to cause the pins 104 to butt against each other. spring 126
The pressing force of the receiving seat 122 on the rotating shaft 74 is
Adjust the position of the catch seat 122 and slider 12.
It can be set to any value by adjusting the interval from 4.

The pressing mechanism for abutting the pins 104 against each other may be another mechanism, such as a mechanism using a pair of leaf springs, for example. In the case of a mechanism using a pair of leaf springs, each leaf spring is placed in one of the grooves 112 in the head 102, and each leaf spring is attached to the head 102 by a screw or the like.
Fixed.

As shown in FIGS. 2, 3, 4, and 6, the reinforcing bar binding machine 10 also includes a pressing mechanism 120.
The release mechanism 136 prevents the pressing force from acting on the pin 104. The release mechanism 136 is
A shaft 138 is provided that passes through the support wall 88 in the horizontal direction. The shaft 138 is connected to a cylinder mechanism 140 supported by the gear case 50 via a coupling mechanism 142, and is angularly rotated when the cylinder mechanism 140 is operated. A flange portion 132 of the slider 124 is attached to one end of the shaft 138.
A cam 144 that engages with is fixed.

The cam 144 pushes the slider 124 toward the seat 122 against the force of the spring 126 due to the angular rotation of the shaft 138 . As a result, the pressing force by the pressing mechanism 120 is prevented from acting on the pins 104, so that the pins 104 can move away from each other.

As shown in FIGS. 1, 2, and 6, a pair of guides 146, 148 define the binding portion 18.
is arranged at the tip of the support wall 88. The guides 146 and 148 have arc-shaped recessed portions, and are arranged so that the recessed portions face each other.

The guides 146, 148 are wire guide paths 150,
152 on the side of the recessed part. Railway guide route 1
50 and 152 jointly guide the iron wire 16 fed into the binding part 18 around the reinforcing bars 12 and 14 through the part deeper than the pin 104 of the slot 110 of the twisting mechanism 100. Railway guideway 150, 15
2 is a groove that opens on the side of the recessed part, that is, on the side of the binding part 18.

Guide 146 placed on the side of the feeding mechanism 82
is fixed to the support wall 88, and also includes a feed guide portion 154 that guides the iron wire 16 fed into the binding portion 18 toward a portion deeper than the pin 104 of the slot 110 of the twisting mechanism 100, and a high pressure air and a nozzle 156 that ejects the water toward the portion where the pins 104 are abutted. Feeding guide part 15
4 consists of a guide tube in the illustrated example. The end surface of the guide tube on the side of the twisting mechanism 100 is connected to the twisting mechanism 10.
It is a curved surface with approximately the same curvature as the outer circumferential surface of the head 102 of No. 0.

The other guide 148 is angularly rotatably attached to the support wall 88 by a pin 158, and the lower end of the guide 148 approaches the lower end of the guide 146 by a cylinder mechanism 160 supported by the gear case 50. and move away from pin 1.
58.

As shown in FIG. 2, the upper end of the rotating shaft 78 of the twisting mechanism 100 is connected to the wire receiving opening portion of the slot 110 when the twisting mechanism 100 is stationary.
It is connected to an alignment mechanism 162 that aligns the wire outlet of 54. Alignment mechanism 162 includes a dog clutch 164 and a cylinder mechanism 166 supported by holder 44 .

As shown in FIG.
is the upper end of the rotating shaft 78 and the cylinder mechanism 166.
The lower end of the piston rod is a so-called torsion clutch having serrated teeth with an inclined surface formed with the lower end of the piston rod.

During standby, the teeth of the dog clutch 164 are engaged with each other by the cylinder mechanism 166. As a result, the rotating shaft 78 of the twisting mechanism 100 is maintained in a position where the slot 110 is aligned with the wire outlet of the feeding guide section 154.

During bundling, with the guide 148 separated from the guide 146 by the cylinder mechanism 160, the cylinder mechanism 30 is contracted by the boss portion 36 until the coil spring 42 is compressed by a predetermined amount. As a result, the arm 32 and each mechanism supported by the arm 32
2 and 14 are moved toward the reinforcing bars 12 and 14 so that the reinforcing bars 2 and 14 are received in the binding portion 18.

Then, with guide 148 close to guide 146, clutch 64 and motor 68 are actuated. As a result, the feeding mechanism 82 is activated and the iron wire 16 is fed into the binding section 18. The iron wire fed into the binding part 18 is guided by guides 146,1
48, the slot 110 is transformed into a multiple-wrap loop that extends around the iron wires 12 and 14 through a portion deeper than the pin 104.

When the iron wire is fed in a predetermined amount, the clutch 64 is released, the brake mechanism 80 is activated, and the cylinder mechanism 16 is stopped instead of the feeding mechanism 82 being stopped.
6 is retracted and the dog clutch 164 is disengaged, the clutch 66 is actuated. As a result, the rotating shaft 78 and the pin 104 are rotated around the axis of the rotating shaft 78, so that the loop-shaped portion of the iron wire 16 fed into the binding portion 18 is
2 and the feeding guide section 154, and then twisted by the pins 104.

When the iron wire is twisted, guide 148 is separated from guide 146 by cylinder mechanism 160. When the iron wire is twisted, the cylinder mechanism 30 is extended. As a result, the pin 104 is rotated while pulling the loop-shaped portion of the iron wire upward, so that the iron wire is neatly twisted.

When the iron wire is twisted, the iron wire is twisted in contact with the end 116 of the pin 104, so that the pin 10
4 is subjected to a force in a direction in which the pins 104 are separated from each other due to a reaction force during twisting. Therefore, when the iron wire is twisted to a predetermined strength and the force exceeds the force of the spring 126, the twisted iron wire is removed from the pin 104.

Thereafter, the arm 32 and the mechanisms supported by it are returned to their original positions. Further, since the dog clutch 164 is engaged with the cylinder mechanism 166, the slot 110 is connected to the feeding guide portion 15.
4.

When the iron wire is twisted, the cylinder mechanism 140 is activated. This causes the cam 144 to move to the receiving seat 1.
24 is pushed up against the force of spring 126,
The pins are now movable away from each other. In this state, compressed air is ejected from the nozzle 156 toward the portion where the pins 104 abut against each other. As a result, the twisted pieces of iron wire are
It is removed from pin 104.

The piece of iron wire may be removed from the pin 104 by other means, or may be removed manually by an operator while the cylinder mechanism 140 is activated. The cylinder mechanism 140 may be operated every time the twisting operation is completed, and in this case, it is preferable to blow out air from the nozzle 156 in synchronization with the operation of the cylinder mechanism 140.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the reinforcing bar tying machine of the present invention, Fig. 2 is a sectional view showing the structure of the bundling mechanism by partially cutting away the reinforcing bar tying machine of Fig. 1, and Fig. 3 is a front view showing an embodiment of the reinforcing bar tying machine of the present invention. The right side view of the reinforcing bar binding machine shown in Fig. 2, and the
A top view of the reinforcing bar binding machine shown in the figure, FIG. 5 is a sectional view showing one embodiment of the pressing mechanism, FIG. 6 is a sectional view showing one embodiment of the pressing mechanism and release mechanism, and FIG. 7 is a sectional view of the rotating shaft. FIG. 8 is a front view showing one embodiment of the pin, and FIG. 9 is a front view showing one embodiment of the slider of the pressing mechanism. 10: Rebar binding machine, 12, 14: Rebar, 16:
Iron wire, 18: Binding part, 78: Rotating shaft, 82: Feeding mechanism, 100: Twisting mechanism, 102: Head, 11
0: slot, 120 pressing mechanism, 122: receiving seat, 124: slider, 126: compression coil spring, 136: release mechanism, 138: shaft, 140: cylinder mechanism, 142: coupling mechanism, 144: cam.

Claims (1)

[Scope of Claims] 1. A reinforcing bar tying machine for tying reinforcing bars with iron wire in a tying part, including means for feeding the iron wire into the tying part, and a means for feeding the iron wire into the tying part into a loop shape extending around the reinforcing bars. a rotating body rotatable around an axis extending in a direction intersecting the axis of the loop formed by the iron wire; a rotating body having a slot through which the iron wire fed into the section can pass; a driving means for rotating the rotating body; A pair of pins supported so as to be relatively movable in a direction and capable of engaging with a loop-shaped portion of the iron wire, the pins sharing with the iron wire a force such that the pins are separated from each other when the iron wire is twisted. a pair of pins, each having an end formed on the pin and arranged such that the ends face each other;
a pressing means for applying a pressing force to at least one of the pins to abut the pins against each other at the ends; and a pressing means for preventing the pressing force from acting on the pins so as to prevent the pins from moving away from each other. a reinforcing bar tying machine, including a release means for allowing. 2 further comprising means for forcibly removing from the pin a piece of iron wire engaged with the pin;
The reinforcing bar tying machine according to claim 1. 3. The reinforcing bar tying machine according to claim 2, wherein the removing means includes a nozzle that blows air onto the abutted portions of the pins. 4. The rotating body includes a rotating shaft extending in a direction perpendicular to the moving direction of the pin, and a head having the slot attached to one end of the rotating shaft, and the pressing mechanism a receiving seat fixed to a shaft; and a slider supported on the rotation shaft so as to be movable in the direction of the rotation axis thereof, the slider having an end portion that contacts the pin and moves the pin in a direction toward each other; A spring is disposed between the slider and the receiving seat and presses the slider in a direction along the axis of rotation so as to move the pins toward each other. The reinforcing bar tying machine according to claim 1, wherein the reinforcing bar tying machine pushes toward the receiving seat against a force. 5. The release means includes a cam that is engaged with the slider and is rotatable around an axis perpendicular to the rotation axis, and that angularly moves the cam so that the slider is moved against the force of the spring. The reinforcing bar tying machine according to claim 4, further comprising a drive mechanism that rotates the reinforcing bar tying machine.