JP2502936Y2 - Power switch controller for binding machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power switch control device for a binding machine, and more particularly to a power switch control device for a battery-driven binding machine.

[0002]

2. Description of the Related Art Conventionally, a worker uses a wire to manually bind a reinforcing bar when constructing a reinforced concrete structure, but the amount of work is enormous depending on the scale of the structure. Become. Therefore, in response to demands such as reduction of labor and improvement of work efficiency, a battery-driven binding that automatically performs a series of binding operations from winding the wire around the reinforcing bars to be bound and twisting the wire to tighten it. Machine is proposed.

This type of binding machine is formed so as to be portable, and a guide tube of the binding wire is projected to the front of the main body. The front part of the guide tube is bent like a hook.If you hook this bent part on the reinforcing bar to be bound and turn on the manual switch, the long wire wound on the reel will be fed by the feed mechanism to the front end part of the guide tube. Sent from. The wire is bent by the bending portion and continuously fed, and goes around the reinforcing bar a plurality of times.

Subsequently, a gripping portion such as a chuck or a hook provided in a twisting mechanism protruding to the front of the binding machine body converges and grasps the wound wire, and the gripping portion rotates to twist the wire and rebar. The cutting machine installed at the front end part of the inner tube cuts the wire at the outlet of the guide tube and finishes the bundling work, and the operation of each mechanism is sequentially controlled to automatically perform one cycle of work. To carry out.

[0005]

During one cycle of operation of the above-mentioned binding machine, the maximum load is applied to the motor during the process of twisting the wire. Therefore, when the battery power is consumed and the voltage drops to near the operable voltage, a large current flows in the twisting process, the power supply voltage drops sharply, the rotation torque decreases, and the motor stops during the twisting operation. Resulting in. At this time,
When the motor is forcibly stopped, a larger current flows to the motor coil, which may cause a disconnection accident due to burnout or heat the battery, which may cause problems such as shortening the life of the rechargeable battery. .

Further, the work of releasing the gripping portion of the twisting mechanism from the grasped wire is not easy, requires a considerable amount of labor and time, and significantly hinders the progress of the binding work. Therefore, there is a technical problem to be solved in order to prevent the motor from being stopped during the operation of one cycle, eliminate the risk of motor burnout and battery damage, and prevent the work efficiency from decreasing. The present invention aims to solve this problem.

[0007]

This invention is proposed to achieve the above object, and is a binding machine 1 using a battery-powered motor 4 as a power source, which comprises a wire feed mechanism and
In a binding machine 1 having a twisting mechanism for twisting a wire wound around a reinforcing bar or the like by the wire feeding mechanism, a manual switch 23 and a switch 21 are connected in parallel to a power supply circuit, and the motor 4
And a voltage detection circuit 111 that engages with the switch 21 so as to turn off the switch 21 at the end of the process of one cycle, and detects a voltage drop below a specified value of the power supply battery 110. , The voltage detection circuit 11
A detection signal holding circuit 112 for holding the voltage drop detection signal of No. 1 until the start of the next cycle is provided, and the detection signal holding circuit 112 and the manual switch 23 are connected to a trigger signal control circuit 113, respectively, and the trigger signal control is performed. Circuit 113
Is configured to output a control signal by the trigger signal of the manual switch 23 only when the voltage of the power supply battery 110 is a specified value or more.
13 and the switch 21 to control the electronic switch control circuit 114 to open and close the electronic switch 115 of the power supply circuit, and the drive signal to the motor 4 is turned on by the control signal of the trigger signal control circuit 113 to turn on the switch 21. A power switch control device for a binding machine configured to turn off the drive current of the motor 4 in response to an off signal.

[0008]

[Function] The voltage detection circuit detects the voltage drop of the power supply battery,
The detection signal is stored in the detection signal holding circuit. The output of the detection signal holding circuit and the manual switch are connected to the trigger signal control circuit, and when the output state of the detection signal holding circuit shows the power supply voltage above the specified value, the trigger signal of the manual switch triggers the trigger signal. The control circuit outputs a control signal. This control signal causes the electronic switch control circuit to turn on the electronic switch and start the motor. At the end of the process for one cycle, the switch engaged with the cam is turned off, and the off signal causes the electronic switch control circuit to turn off the electronic switch to stop the motor.

When the power supply voltage drops below a specified value while the motor is rotating, the voltage detection circuit detects the voltage drop, and the detection signal is held in the detection signal holding circuit to end a series of binding cycles. . Even if the manual switch is operated in this state to input the trigger signal to the trigger signal control circuit, the control signal is not output from the trigger signal control circuit and the motor is not started. Therefore, the work of the next cycle cannot be started, and the motor is prevented from stopping due to the voltage drop during the process.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. For convenience of description, the configuration of the entire binding machine will be described first. 1 is a side view of the binding machine with a side cover removed, FIG. 2 is an enlarged side view of the housing portion, FIG. 3 is a cross-sectional plan view of the housing portion, and FIGS. 4 to 10 are lines AA of FIG. , BB line, C-C line, DD line, EE line,
It is a FF line and a GG line arrow line view.

In the binding machine 1 shown in FIG. 1, a grip 3 is provided on the lower surface of a housing 2 made of die-cast, and a motor 4 is driven by a Ni-cd battery (not shown) housed in the side surface of the housing 2. The motor 4 is arranged at the rear lower part of the housing 2 at the back of the paper in the figure, drives the first intermediate shaft 7 via gears 5 and 6 as shown in FIGS. 7, the power is transmitted from the first intermediate shaft 7 to the second intermediate shaft 10 by the gears 8 and 9, and further in front thereof, the speed is reduced by the gears 12 and 13 to the main shaft 11 as shown in FIG. Transmitted power.

As shown in FIG. 2, a worm gear 14 is fitted to the rear portion of the main shaft 11, and as shown in FIG. 10, a cam shaft 15 is disposed above the worm gear 14 in the left-right direction.
Worm gear 14 meshes with the worm wheel 16 of
The cam shaft 15 is rotated. Four cams 17, 18, 19, 20 which will be described in detail when explaining the operation are fitted on the cam shaft 15. In FIG. 10, the rightmost cam is the motor control cam 17
As shown in FIG. 2, the push button 22 of the normally open switch 21 is brought into contact with the cam surface, and the power is cut off when the push button 22 is fitted in the concave portion of the cam surface. The self-holding circuit is formed by connecting the switch 21 and the non-lock type manual switch 23 provided on the grip 3 in parallel to the power source by the battery described above. Therefore, when the manual switch 23 is pressed once to start the motor 4, the motor control cam 17 rotates, the push button 22 of the switch 21 comes out of the recess of the cam 17 and turns on, and the pressing of the manual switch 23 is released. However, the power is not cut off. Then, as the motor 4 rotates, the motor control cam 17 makes one rotation, the push button 22 is fitted into the recess of the cam 17, and the power is cut off. The bundling machine 1 is configured such that while the motor control cam 17 makes one rotation, the other three cams 18, 19,
20 is formed so that a series of operations from wire feeding to binding are sequence-controlled.

A pawl clutch 24 having pawls on both front and rear surfaces is loosely fitted to an intermediate portion of the main shaft 11 so as to be movable on the main shaft 11 by means of a feather key 25.
A bevel gear 26 with a pawl and a spur gear 27 with a pawl that can be meshed with the No. 4 are freely rotatably inserted in front of and behind the pawl clutch 24. The claw bevel gear 26 meshes with a bevel gear 28 arranged above it, and as shown in FIG. 8, a spur gear 29 formed coaxially with the bevel gear 28 meshes with an opposing spur gear 30. The shaft of the spur gear 30 penetrates the upper partition wall 31 of the housing 2, and the driving roller 32 is fitted to the upper end portion thereof. This driving roller 32 is
A V-shaped groove 33 in the circumferential direction is formed in the center of the outer periphery of the spur gear, and meshes with a driven roller 34 of the same shape as shown in FIG. 3 to clamp the wire in the V-shaped grooves 33, 33 and feed it. It is something to put out.

The driven roller 34 is pivotally attached to one end of an opening lever 35 pivotally attached to the upper partition wall 31. As shown in FIG. 3, a coil spring 36 is interposed in the opening lever 35 to urge it in the counterclockwise direction in FIG. 3 so that the driven roller 34 is brought into pressure contact with the driving roller 32 to be meshed therewith. Release lever 35
The other end of the driven roller 34 protrudes to the outside of the housing 2, and when the protruding portion is pressed toward the housing 2 to rotate the opening lever 35 in the clockwise direction, the driven roller 34 becomes the driven roller 3.
Move away from 2. When the binding machine 1 is used, it is necessary to insert a wire between the two rollers 32 and 34, but the operation of the release lever 35 causes the two rollers 3 to move.
If the distance between 2, 34 is widened, the tip of the wire can be easily inserted.

A guide tube 40 is disposed in front of the two rollers 32 and 34, and the rear end of the conduit is located at the two rollers 3 and 34.
It is directed to 2, 34 meshing parts. The guide tube 40 can slide back and forth within the housing 2 within a certain range, and as shown in FIG. 2, a coil spring 41 is interposed between the guide tube 40 and the housing 2, and the guide tube 40 is always urged forward. In the stop state shown, the stopper pin 42 provided on the housing 2 is engaged with the engaging portion 43 of the guide tube 40 and its forward movement is restricted.

A cable wire 44 is provided at the rear of the guide tube 40.
Is fixed at one end, and the other end of the cable wire 44 is fixed at the tip of a guide tube return lever 45 pivotally attached to the rear of the housing 2. When the guide tube return lever 45 is rotated counterclockwise in the figure by the rotation of the guide tube return cam 20 of the cam shaft 15 described above, the guide tube 40 connected via the cable wire 44 moves backward. Pull back.

On the other hand, the upper end plate 4 of the pulley 46 horizontally pivoted on the upper surface of the intermediate portion of the guide tube 40 shown in FIGS. 2 and 3.
7 is formed with a protrusion 48 protruding laterally.
The adjusting screw 49 is screwed in the direction of 8 in the direction of rotation of the pulley 46. The pulley 46 is driven by a cam mechanism which will be described later.
When rotated in the counterclockwise direction, the head of the adjusting screw 49 presses the stopper pin 42 to push it in, and the guide tube 40 is released from the movement restriction. At this time, the guide tube return lever 45 is not pressed by the guide tube return cam 20, and the guide tube 40 projects forward. Then, the protruding portion 50 protruding laterally from the intermediate portion of the guide tube 40 shown in FIG. 2 collides with the stopper 51 provided in the housing 2 in front of the protruding portion 50, and the movement thereof is restricted.

Subsequently, at the end of the bundling operation, the guide tube return lever 45 is rotated by the guide tube return cam 20, the guide tube 40 is pulled by the cable wire 44 and retracts, and the stopper pin 42 engages with the engaging portion 43. 2 is engaged with the guide tube 40.
And, it returns to the predetermined position shown in FIG. FIG. 11 is a longitudinal sectional view of a main part of the guide tube 40, showing two parallel guide paths 5
2, 53 are shown. The lower guideway is the wire guideway 5
2 and the upper side is the cable wire guide path 53 of the cutting mechanism.
Is. A flat cutter chamber 55 that crosses the guide paths 52 and 53 is provided near the tip of the curved portion 54 of the guide tube 40, and a guide pin 56 is provided upright on a wire path in the cutter chamber 55. The guide pin 56 is provided with a guide hole 57, which is a passage for the wire, and forms a relay path to an inclined guide hole 58 at the tip of the guide tube 40 described later.

The guide pin 56 has the guide pin 5
6, a cutter plate 59 having a hole having substantially the same diameter as that of 6 is loosely fitted, and the cable wire 6
One end of 0 is locked and the other end is locked to the pulley 46. The cutter plate 59 has an opening 6 at a portion corresponding to the vicinity of the entrance of the guide hole 57 of the guide pin 56.
1, and a hole 62 for connecting the outlet of the guide hole 57 of the guide pin 56 and the inclined guide hole 58 is provided. Therefore, in the state shown in the figure, the wire fed through the wire guide path 52 passes through the guide hole 57 of the guide pin 56, the hole 62 of the cutter plate 59, and the inclined guide hole 58, respectively, and is sent out from the tip portion.

On the other hand, when the pulley 46 is rotated clockwise in FIG. 3, the cable plate 60 shown in FIG. 11 pulls the cutter plate 59 and rotates counterclockwise in FIG. Shear the wire by. As shown in FIG. 4, a pulley 63 is provided with a spring 63 to apply a rotational force in the counterclockwise direction in FIG. 3, and a lever 64 fixed to the lower portion of the pulley 46 is moved by the operation of a cam 18 described later. The cutter plate 59 is formed so as to return to the position shown in FIG. 11 when it is not pressed.

In the curved portion 54 of the guide tube 40, as shown in FIGS. 12 and 13, the guide groove 6 is formed in parallel with the wire guide path 52.
5 are arranged side by side. The guide groove 65 is the wire guide path 5
It is a circular groove whose inner peripheral surface is open with substantially the same radius as 2, and the wire sent out from the wire guide path 52 is circulated along the groove and wound around a target reinforcing bar. Guide pieces 67, 67 that are widened to the left and right are provided at the introduction portion 66 of the guide groove 65, and the tip end of the wire sent out from the wire guide path 52 is brought into contact with the guide pieces 67, 67 to enter the guide groove 65. We are making sure that it can be introduced. Further, the tip end portion of the wire guide path 52 is displaced toward the introduction portion 66 of the guide groove 65 to form the inclined guide hole 58. As a result, the center of the left and right blurring of the sent wire can be made to substantially coincide with the center of the introduction portion 66 in the width direction, and the wire collides with the guide pieces 67, 67 and can recoil to the outside. The failure in the winding stage of the binding work is eliminated.

Next, a twisting mechanism for twisting and tightening the wound wire will be described. As shown in FIG. 2, the twisting mechanism 70 is arranged below the guide tube 40. The twisting mechanism 70
Is a spur gear fitted to the rear end portion of the rear shaft 71 by connecting a split shaft into a rear shaft 71 and a front shaft 72 by a ball clutch 75 composed of coil springs 73, 73 ... And balls 74, 74. 76 is engaged with the spur gear 27 with a claw that is loosely fitted to the main shaft 11 described above. An outer cylinder 77 is slidably fitted onto the front shaft 72, and as shown in FIG.
The hook 79 is inserted into the slot 78 provided in the main body 7, and the middle portion of the hook 79 is pivotally attached by the cotter pin 80. The fork portion 81 formed at the rear end portion of the hook 79 is attached to the front shaft 72.
It is inserted into the slot 82 at the tip end and is locked by the stop pin 83. Therefore, when the outer cylinder 77 is slid rearward with respect to the front shaft 72, the hook 79 is jumped up as shown in FIG. When the outer cylinder 77 is slid forward, the hook 79 rotates in the opposite direction and abuts on the tip of the outer cylinder 77.
Only the abutting portion 84 is projected forward so that the hook 79
It is formed so that the wire can be sandwiched between the tip of the outer cylinder 77 and the outer cylinder 77.

Next, a cam mechanism for controlling the operation of each of the above-mentioned mechanism parts will be described. FIG. 15 shows the three cams 17, 18 and 19 shown in FIG. 10. The clutch shift shaft 90 engaged with the clutch cam 19 contacts the cam surface of the clutch cam 19 with the roller 91 pivotally supported at the tip. ing. This clutch shift shaft 90, as shown in FIG.
5, the clutch shifter 92 fitted to the front end portion of the shaft is fitted in the groove portion 93 provided in the middle portion of the pawl clutch 24 as shown in FIG. 7 and FIG. . Further, the cutting / grasping cam 18 shown in FIG. 15 is in contact with a roller 101 which is rotatably supported at the tip of the shift shaft 100, and the shift shaft 100 is provided with a pulley 46 of a wire cutting mechanism.
The hook 79 of the twisting mechanism 70 is operated. As shown in FIGS. 3 and 4, the shifter 102 fixed to the tip portion of the shift shaft 100 has a groove portion 8 provided in the outer cylinder 77 of the torsion mechanism 70.
5 is fitted. Further, a pin 103 is provided so as to project upward from an intermediate portion of the shift shaft 100, and the pin 103 is made to face the rear surface of the lever 64 below the pulley 46 described above. The motor control cam 17 shown in FIG. 15 turns on / off the switch 21 as described above.

In the binding machine 1, the cam shaft 15 makes one rotation in the clockwise direction from the stopped state shown in FIG. 15 to perform one cycle of the process. Referring to the cam diagram of FIG. The operation of will be described. First, as shown in FIG.
The reel R wound with is attached to the reel mounting portion 37 at the rear of the housing 2, and the tip of the wire W is inserted into the insertion tube 38 having an opening on the rear surface of the housing 2. Next, when the wire W is inserted between the two rollers 32 and 34 by pressing the release lever 35 shown in FIG. 3 and the pressing of the release lever 35 is released, the wire W is sandwiched between the two rollers 32 and 34. Work preparation is completed.

To perform the binding work, the guide tube 4 shown in FIG.
Hang the curved part 54 of 0 on the reinforcing bar (not shown) to be bound,
The manual switch 23 of the grip 3 is pushed (time point A). As a result, the motor 4 is started, the main shaft 11 is interlocked, the motor control cam 17 is rotated, the switch 21 is turned on, and one cycle of operation is performed regardless of whether the manual switch 23 is on or off. When the motor 4 is started, the clutch shift shaft 90
Is retracted from the neutral position (N in FIG. 16) and the claw clutch 2
4 meshes with a bevel gear 26 with a claw that is loosely fitted to the main shaft 11, and drives a roller 32. The wire W sent through the wire guide path 52 passes through the above-described inclined guide hole 58 and is introduced into the guide groove 65, and is further wound around the reinforcing bar along the guide groove 65 for a predetermined number of turns.

Next, at time B, the pawl clutch 24 returns to the neutral position, the rollers 32 and 34 stop, and the disconnection /
The shift shaft 100 that engages with the grasping cam 18 advances, and the wound wire W is gripped by the hook 79. At the same time, with the pin 103 provided in the middle portion, the lever 64 at the bottom of the pulley
And press the cutter plate 59 at the tip of the guide tube 40.
The wire W is sheared by. Further, the adjusting screw 49 provided on the upper portion of the pulley 46 presses the stopper pin 42 to release the locking of the guide tube 40, and the guide tube 40 is projected forward by the bias of the coil spring 41. Since the guide tube 40 has moved forward of the wire wound around the reinforcing bar, when the binding machine 1 is pulled backward, the wire W wound around the reinforcing bar is tensioned by the hook 79. This makes it possible to make the tightening force uniform in each turn when the wire wound a plurality of times is twisted.

Next, at time point C, the claw clutch 24 meshes with the claw spur gear 27 to rotate the twisting mechanism 70, and the wire W gripped by the hook 79 is twisted to bind the reinforcing bars.
Then, the pawl clutch 24 is returned to the neutral position, the rotation of the twisting mechanism 70 is stopped, the shift shaft 100 is retracted, the hook 79 is lifted, and the hook W is disengaged (time D).

Subsequently, the guide tube return cam 20 shown in FIG.
Pushes the guide tube return lever 45 to rotate, and the guide tube 40
Moves backward (time point E). When the guide tube 40 retracts to the position shown in FIG. 2, the stopper pin 42 provided on the housing 2 side projects and engages with the engaging portion 43 of the guide tube 40.
Thereafter, the guide tube return cam 20 releases the pressing of the guide tube return lever 45 to release the tension of the cable wire 44, and the motor control cam 17 turns off the switch 21.
The power is turned off to complete the one cycle bundling operation (time point F). In this way, the work of winding the wire around the reinforcing bar, twisting and binding the wire is automatically performed.

Next, the power switch controller of the present invention will be described with reference to the circuit diagram of FIG. As shown in the figure, the voltage of the power supply battery 110 is compared with the reference voltage by the voltage detection circuit 111, and the state of the power supply voltage is stored in the detection signal holding circuit 112. The reference voltage is set to a value that indicates the power supply capacity that can complete at least one cycle of binding work based on the power consumption of one cycle of binding work. Expected to stop. The output signal of the detection signal holding circuit 112 and the output signal of the manual switch 23 are input to the trigger signal control circuit 113. Trigger signal control circuit 113
Outputs the control signal by the trigger signal of the manual switch 23 only when the output state of the detection signal holding circuit 112 indicates power supply voltage> reference voltage. By this control signal, the electronic switch control circuit 114 causes the electronic switch 115 to
Is turned on, and the motor 4 is energized. When the motor 4 is started, the switch 21 is turned on by the rotation of the motor control cam 17 as described above, and the switch 21 is turned off after performing one cycle process. By this off signal, the electronic switch control circuit 114 turns off the electronic switch 115 to cut off the power supply to the motor 4.

When the power supply voltage drops below the reference voltage,
The output of the detection signal holding circuit is reversed and the state is held. In this case, the start command for the next cycle should be the manual switch 2
3 does not output a control signal from the trigger signal control circuit 113, and the motor 4 does not start. Therefore, the motor is prevented from stopping due to the voltage drop during the process.

18 and 19 show an embodiment of the circuit of the power switch controller, and the detection signal holding circuit 112, the trigger signal control circuit 113, and the electronic switch control circuit 114 are flip-flop circuits, respectively. The reference voltage by the resistor 116 and the constant voltage diode 117 is input to the + input terminal of the voltage detection circuit 111 using the comparator, and the power supply voltage divided by the two resistors 118 and 119 is input to the − input terminal. Has been done. The output terminal of the voltage detection circuit 111 is connected to the set terminal S of the detection signal holding circuit 112, and the power supply is connected to the reset terminal R via the inverter 120.

The Q signal output of the detection signal holding circuit 112 is connected to the input terminal D of the trigger signal control circuit 113,
The open / close signal of the manual switch 23 is input to the input terminal C via the inverter 121. Electronic switch control circuit 1
The input terminal D of 14 is connected to the power source, and the Q output of the trigger signal control circuit 113 is connected to the input terminal C. The Q output of the electronic switch control circuit 114 is the electronic switch 115 of the N-channel MOS type FET shown in FIG. Are connected to the respective gates of the brake electronic switch 122 of the P channel MOS type FET.

Connect the power battery 110 to the main switch 12
When 3 is turned on, the voltage detection circuit 111 compares the power supply voltage with the reference voltage. If the power supply voltage to be compared is higher than the reference voltage, the input of the set terminal S of the detection signal holding circuit 112 is 0 and the output of QQ is 1, which is input to the input terminal D of the trigger signal control circuit 113. . next,
When the manual switch 23 is turned on, the trigger signal control circuit 1
A trigger pulse is input to the input terminal C of 13, and the Q output changes from 0 to 1. As a result, the electronic switch control circuit 1
The Q output of 14 becomes 1 and the electronic switch 1 shown in FIG.
15 is turned on and the brake electronic switch 122 is turned off to start the motor 4, and at the same time, the NAND gate 12
Via 4, 125, a trigger pulse is applied to the reset terminal R of the trigger signal control circuit 113 to reset it. Further, the switch 21 is turned on by the rotation of the motor 4.

When the switch 21 is turned off by the motor control cam 17 at the end of the one cycle process, the inverters 126 and 127 and the NAND gates 128 and 12 are turned on.
9. Electronic switch control circuit 1 via OR gate 130
A trigger signal is applied to the reset terminal R of 14 to set the Q output to 0 to turn off the electronic switch 115 and turn on the brake electronic switch 122 to stop the motor 4.

When the power supply voltage drops below the specified value during the binding process or at the end of the binding process, the output of the voltage detection circuit 111 rises, and the Q output of the detection signal holding circuit 112 is set to 0. This state is held unless a trigger signal is input to the reset terminal R of the detection signal holding circuit 112 due to replacement of the battery 110, turning on / off of the main switch 123, or the like. Therefore, since the input state of the input terminal D of the trigger signal control circuit 113 is 0, the manual switch 23 is in this state.
Even when turned on, the Q output of the trigger signal control circuit 113 is 0, no pulse is applied to the input terminal C of the electronic switch control circuit 114, and the drive signal for the motor 4 is not output. Therefore, the work of the next cycle cannot be started, and the possibility that the motor 4 is stopped due to the voltage drop during the process of the next cycle is eliminated.

The circuit of this embodiment further includes a motor 4
An overcurrent detection circuit is provided to detect the current flowing through the circuit. As shown in FIG. 19, the overcurrent detection circuit includes a resistor 131 that is inserted in series with a power supply circuit, an amplifier 132 that amplifies a voltage between both terminals of the resistor 131, and a voltage that is amplified by the amplifier 132 as a reference. Comparator 13 for comparing with voltage
And 3. The output of the comparator 133 is input to the set terminal S of the protection circuit 134, and when a large current exceeding the specified value flows in the motor 4, the Q output of the protection circuit 134 becomes 1 and the OR gate 130 shown in FIG. The electronic switch control circuit 114 is reset via this to immediately cut off the motor drive signal. Therefore, when the motor 4 is forcibly stopped during the above-described twisting process or the like, it is possible to prevent excessive current from continuing to flow to the motor 4.

The circuit of the present invention should not be limited to the above-mentioned embodiment, but various modifications can be made, and it goes without saying that the present invention covers those modifications.

[0038]

As described in detail in the above-mentioned one embodiment, the present invention constantly monitors the voltage of the power supply battery, and recognizes the voltage drop which is predicted to stop the motor during the process of the next binding cycle. If so, the motor is not energized even if the manual switch is operated. Therefore, it is possible to prevent the motor from becoming unrotatable during the twisting process due to the voltage drop, the gripping part does not stop while grasping the wire, and the situation such as the work of releasing the gripping part does not occur, The decrease in work efficiency is prevented, and the operator can recognize the arrival of the battery replacement time.

Further, since the motor which is being energized is not forcibly stopped, there is no fear that the motor coil will be burned due to overcurrent, or the battery life will be shortened due to heat generation, and safety will be improved. It is a device of various practical value.

[Brief description of drawings]

FIG. 1 is a side view of a binding machine with a side plate removed.

FIG. 2 is an enlarged view of a housing portion of FIG.

FIG. 3 is a plan view in which a top plate of the housing is cut away.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a sectional view taken along the line BB of FIG.

FIG. 6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a sectional view taken along the line DD of FIG.

FIG. 8 is a cross-sectional view taken along the line EE of FIG.

FIG. 9 is a sectional view taken along the line FF of FIG.

FIG. 10 is a sectional view taken along the line GG in FIG.

FIG. 11 is a partially cutaway left side view of the guide tube.

FIG. 12 is a bottom view of a main portion of the guide tube.

FIG. 13 is a right side view of the guide tube.

FIG. 14 is a partially cutaway plan view showing a main part of a twisting mechanism.

FIG. 15 is a side view of a motor control cam, a disconnection / grasping cam, and a clutch cam.

FIG. 16 is a cam diagram showing the operation timing of each cam.

FIG. 17 is a block diagram showing a circuit configuration of a switch control device.

FIG. 18 is a circuit diagram showing the first half of the circuit of the switch control device.

FIG. 19 is a circuit diagram showing the latter half of the circuit of the switch control device.

[Explanation of symbols]

 1 Bundling Machine 4 Motor 21 Switch 23 Manual Switch 110 Power Battery 111 Voltage Detection Circuit 112 Detection Signal Holding Circuit 113 Trigger Signal Control Circuit 114 Electronic Switch Control Circuit 115 Electronic Switch

Claims (1)

(57) [Scope of utility model registration request] 1. A binding machine 1 using a battery-powered motor 4 as a power source, the binding machine 1 comprising a wire feeding mechanism and a twisting mechanism for twisting the wire wound around rebar or the like by the wire feeding mechanism. In the power circuit, the manual switch 23 and the switch 2
1 is connected in parallel, and a cam 17 that interlocks with the motor 4 is engaged with the switch 21 so that the switch 21 is turned off at the end of one cycle process.
10 and a detection signal holding circuit 11 for holding the voltage drop detection signal of the voltage detection circuit 111 until the start of the next cycle.
2 is provided, and the detection signal holding circuit 112 and the manual switch 23 are connected to a trigger signal control circuit 113, respectively.
A control signal is formed by the trigger signal of the manual switch 23 only when the voltage of 10 is a specified value or more, and the electronic switch control circuit 114 is controlled by the trigger signal control circuit 113 and the switch 21. The electronic switch 115 of the power supply circuit is opened / closed, the drive current to the motor 4 is turned on by the control signal of the trigger signal control circuit 113, and the drive current of the motor 4 is turned off by the off signal of the switch 21. Power switch control device for the binding machine.