JP4016799B2 - Rebar binding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing bar binding machine, and more particularly, to a reinforcing bar binding machine configured to detect a clamping failure when the tip of a binding line cannot be clamped and to appropriately control the next binding line start position. Is.
[0002]
[Prior art]
Conventionally, this type of reinforcing bar binding machine sends out the binding wire by the binding wire feed mechanism to form a loop around the reinforcing bar, clamps the tip of the binding wire by the clamp mechanism, and cuts the other end of the binding wire by the cutting mechanism After that, there is known one that binds reinforcing bars by rotationally driving the clamp mechanism by a binding wire twisting mechanism and twisting the binding wire (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-38647 A (pages 1 to 4, FIGS. 1 to 9)
In addition, the applicant of the present application forms a single binding wire loop by the binding wire feeding mechanism, holds the tip of the binding wire by the clamp mechanism, and then reversely drives the binding wire feeding mechanism to pull the binding wire back and bind it. The configuration is such that the wire loop diameter is reduced and then the binding wire is twisted to bind it, and the drive current of the binding wire feed motor is measured sequentially per unit time during the binding wire pull-back process, and the latest measurement There has also been proposed a reinforcing bar binding machine provided with a control means for stopping the feed motor when the value is increased by a predetermined amount from the lowest value in the measured value (Japanese Patent Application No. 2002-067449).
[0004]
[Problems to be solved by the invention]
In the conventional rebar binding machine, if the clamp mechanism cannot clamp the tip of the binding wire, the binding wire is pulled into the feeding mechanism during the binding wire pulling process, and the binding wire is reloaded. Had to do.
[0005]
In the above proposal (Japanese Patent Application No. 2002-067449), the driving load of the feed motor is monitored in the binding wire pull-back process, and an increase in the feed motor drive current when the binding wire comes into close contact with the reinforcing bar is detected to stop the feed motor. As a result, the pull-back amount of the binding wire is automatically controlled according to the diameter of the reinforcing bar to make the binding finish uniform, and the consumption of the binding wire is reduced. When clamping cannot be performed, the driving load of the feed motor is reduced, and control such as stopping of pulling back can be performed.
[0006]
However, the drive current of the feed motor may change due to electrical noise, and it is difficult to accurately detect a clamping failure. In addition, the driving load of the feed motor may fluctuate depending on the amount of remaining battery power, the temperature during use, and the diameter of the target reinforcing bar, and the clamp failure may not be detected.
[0007]
Therefore, there is a technical problem to be solved in order to detect a clamping failure when the tip of the binding wire cannot be clamped and to appropriately control the next binding wire start position. Aims to solve this problem.
[0008]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above-described object. The binding wire is fed out by a binding wire feeding mechanism to form a loop around the reinforcing bar, the tip of the binding wire is clamped by the clamping mechanism, and the binding wire is formed. The feed mechanism is driven reversely, the binding wire is pulled back and wound around the rebar, the other end of the binding wire is cut by the cutting mechanism, and then the clamp mechanism is rotationally driven by the binding wire twisting mechanism to twist the binding wire. In the reinforcing bar binding machine, a twisting motor drive current detection circuit for the binding wire twisting machine groove is provided, and the driving current of the torsion motor is measured every unit time from the binding wire pulling process to the binding wire twisting process. And when an increase in drive current due to the operation of the cutting mechanism is not measured, a reinforcing bar binding machine provided with a control means for detecting that the clamp mechanism could not clamp the tip of the binding wire,
And when the clamp mechanism detects that the tip of the binding wire has not been clamped, it is adjusted to an appropriate start position by increasing the feed amount by a predetermined length in the next binding wire feed process. A reinforcing bar binding machine provided with a control means is provided .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 show a binding wire feeding mechanism 1 and a binding wire twisting mechanism 2 of a reinforcing bar binding machine, which are built in a casing (not shown) having a grip like a hand-held tool such as a nailing machine. A wire wound around a wire reel (not shown) is supplied by a binding wire feed mechanism 1 to a nose 6 curved in an arc shape through a binding wire guide hole 5 of a cutter block 4 provided in the nose portion 3.
[0010]
FIG. 4 shows the binding wire feed mechanism 1, V-grooved drive gears 8 and 9 are arranged on the base plate 7 in the front-rear direction along the direction of travel of the wire W, and the two front and rear V-groove drive gears 8 and 9 are arranged. The V-grooved driven gears 10 and 11 are engaged with each other. The two V-groove drive gears 8 and 9 mesh with the intermediate gear 12, and the power is transmitted from the feed motor (DC motor) 13 via the reduction gear 14 and the intermediate gear 12, and the two V-groove drive gears are provided. The drive gears 8 and 9 rotate in synchronization.
[0011]
Two front and rear V-groove driven gears 10 and 11 are attached to a bell crank type gear holder 15. An elongated hole 16 is formed in the middle of the gear holder 15 in a direction perpendicular to the wire feeding direction. The pin 17 provided on the base plate 7 is engaged with the elongated hole 16 to swing the gear holder 15 back and forth and left and right. Holds freely. A lever 18 is attached to the base plate 7, and a front end portion of the lever 18 and a rear end portion (right end portion in the drawing) of the gear holder 15 are pin-coupled. A compression coil spring 20 is interposed between a rear end portion of the lever 18 and a spring seat 19 provided on the base plate 7, and the tip end portion of the lever 18 and the gear holder 15 are opposed to each other by the spring force of the compression coil spring 20. Energized in the direction of the grooved drive gears 8 and 9, the two V-groove driven gears 10 and 11 are elastically contacted with the V-groove drive gears 8 and 9, respectively.
[0012]
When using the reinforcing bar binding machine, the lever 18 is rotated by pushing the rear end of the lever 18 with a finger, the gear holder 15 is retracted, and the two V-groove driven gears 10 and 11 are V-groove drive gears. The tip of the wire W drawn from the wire reel is passed between the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11. When the lever 18 is released, the wire W is sandwiched between the V-grooves of the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11, and the V-groove drive gears 8 and 9 and the V-groove The driven gears 10 and 11 mesh to be ready for use.
[0013]
When the straightness of the wire is poor, the V-groove driven gear 10 is pushed in the lateral direction when the upstream V-groove drive gear 8 and the V-groove driven gear 10 draw the wire. However, at this time, the gear holder 15 swings around the pin 17 as a fulcrum, and the downstream V-groove driven gear 11 remains engaged with the V-groove drive gear 9. Yes, the wire W is continuously fed. Further, due to local unevenness of the wire passing through the upstream V-grooved drive gear 8 and the V-groove driven gear 10, the downstream V-grooved drive gear 9 and the V-grooved driven gear 11 are engaged. Even in the case of disconnection, the upstream V-grooved driven gear 8 and the V-grooved drive gear 10 are engaged with each other, so that the wire feed does not stop.
[0014]
Next, the binding wire twist mechanism 2 will be described. As shown in FIGS. 1 and 2, the binding wire twisting mechanism 2 has two motors, a twisting motor 21 and a slide motor 22, and the twisting motor 21 drives the final gear 23 through a reduction gear train. A ball screw shaft 24 is spline-fitted into the center hole of the final gear 23. A male screw is formed at the tip of the ball screw shaft 24, and a shaft of a central clamp plate 26, which is a part of the binding wire clamp device 25, is rotatably coupled to the tip. The binding wire clamp device 25 includes a central clamp plate 26, clamp plates 27 and 28 arranged on the left and right of the central clamp plate 26, a sleeve 29 covering the three clamp plates 26, 27 and 28, and a rear end of the sleeve 29. A ball (not shown), which is composed of a fitted ball pressing ring 30 and fitted in the hole of the sleeve 29, is engaged with the male screw of the ball screw shaft 24.
[0015]
When the torsion motor 21 rotates in the forward direction, the sleeve 29 moves backward by the rotation of the ball screw shaft 24. Anti-rotation fins 31 are arranged radially on the outer periphery of the ball holding ring 30. At the foremost position, which is the initial position, the anti-rotation fins of the ball holding ring 30 are attached to the anti-rotation claw (not shown) provided in the casing. 31 is engaged, and the binding wire clamp device 25 is in a non-rotatable state.
[0016]
A shifter disk 32 that is rotatable with respect to the ball screw shaft 24 is attached to an intermediate portion of the ball screw shaft 24. The shifter disk 32 is connected to a ball pressing ring 34 screwed into the ball screw shaft 33 of the slide motor 22, and the ball screw shaft 24 and the binding wire clamp device 25 of the binding wire twisting mechanism 2 according to the rotation direction of the slide motor 22. Moves back and forth.
[0017]
The left and right clamp plates 27, 28 can slide in parallel to the left and right along the guide pins 35 provided on the central clamp plate 26, and the guide pins 36, 37 provided on the clamp plates 27, 28 are provided on the sleeve 29. It is engaged with a groove cam 38 formed on the inner peripheral surface. The groove cam 38 has a shape in which the left and right clamp plates 27 and 28 approach each other when the sleeve 29 is retracted.
Sandwiches the central clamp plate 26.
[0018]
Next, the operation of the reinforcing bar binding machine will be described. 1 to 3 show a normal initial state, and the tip of the wire W is introduced up to the binding wire guide hole 5 of the cutter block 4. When the trigger is pulled from this initial state, the torsion motor 21 rotates a predetermined number of times in the forward direction, the sleeve 29 moves backward as shown in FIG. 5, and the left and right clamp plates 27 and 28 are lightly closed. The clamp plate 27 on the right side (upper side in FIG. 5A) as viewed from the operator is formed with a binding wire guide groove 39 serving as a wire feed path. The left clamp plate 28 is formed with a channel-shaped recess 40 reaching from the upper part to the lower end of the inner side surface, and the wire is introduced into the recess 40 from below the clamp plate 28 in the next wire feeding step.
[0019]
Subsequently, as shown in FIG. 6, the feed motor 13 is activated, and the guide groove 39 of the right clamp plate 27 is rotated by the rotation of the two front and rear V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11. The wire W fed out to the nose 6 is bent in a loop along the guide groove shape on the inner periphery of the nose 6, and the tip enters the recess 40 from the lower surface opening of the clamp plate 28 on the left side. Hit the club and stop. The feed amount of the wire W is controlled by the control device. S is a reinforcing bar.
[0020]
After the feed motor 13 is stopped, the torsion motor 21 is started, the sleeve 29 is further retracted as shown in FIG. 7, and the left clamp plate 28 is pressed against the center clamp plate 26 to sandwich the tip of the wire W. Subsequently, as shown in FIG. 8, the feed motor 13 is driven in reverse to pull back the wire W, and the loop length is adjusted according to the diameter of the reinforcing bar.
[0021]
Following the wire pullback step shown in FIG. 8, as shown in FIG. 9, the feed motor 13 is driven to rotate forward to feed the wire W by a specified length. This is to make the amount of protrusion of the knot portion uniform by setting the twisting allowance of the wire W to a constant length regardless of the thickness of the reinforcing bar.
[0022]
Then, the sleeve 29 is further retracted as shown in FIG. 10, the wire W is firmly sandwiched between the left and right clamp plates 27, 28 and the central clamp plate 26, and the slide motor 22 is driven to rotate forward as shown in FIG. The ball screw shaft 24 and the binding wire clamp device 25 are moved backward. As the binding wire clamp device 25 moves in parallel with the binding wire guide hole 5 of the cutter block 4, the wire W is sheared at the position of the guide groove 39 of the left clamp plate 27 and the sliding surface of the binding wire guide hole 5. The
[0023]
Then, as shown in FIG. 12, when the binding wire clamp device 25 is further retracted to apply tension to the wire W and the drive current reaches a specified upper limit due to an increase in the drive load of the slide motor 22, the slide motor 22 To stop. In this tensioning step, the binding wire clamping device 25 may be rotated halfway first to cross the wires W and then retract.
[0024]
Next, since the torsion motor 21 is driven forward and the rotation-preventing fin 31 of the ball retaining ring 30 retracted from the initial position is disengaged from the rotation-stopping claw of the casing, the binding wire clamping device 25 is moved as shown in FIG. Rotate. At the same time, the slide motor 22 is driven in reverse to advance the ball screw shaft 24 and the binding wire clamp device 25, and the binding wire clamp device 25 twists the wire W while approaching the reinforcing bar S.
[0025]
As shown in FIG. 14, when the driving current reaches a specified upper limit due to an increase in the driving load of the torsion motor 21 when the torsion is completed, or when the torsion motor 21 and the slide motor 22 Stop driving. Subsequently, as shown in FIG. 15, the torsion motor 21 is rotated in the reverse direction, the sleeve 29 is moved forward to open the left and right clamp plates 27 and 28, and the bundled wires W are released, and then the torsion motor 21 and the slide motor 22 are moved. Then, the binding wire clamp device 25 is returned to the initial position to complete one cycle of the binding operation.
[0026]
FIG. 16 is a block diagram of an electric circuit of the binding wire feed mechanism 1 and the binding wire torsion mechanism 2. The control device 51 drives the feed motor 13 through the feed motor forward / reverse drive circuit 52, and forward / reverse drive for the torsion motor. The torsion motor 21 is driven through the circuit 53. The rotation speed detection sensor 54 detects the rotation pulse of the feed motor 13 and the rotation pulse of the torsion motor 21, and the respective detection signals are input to the control device 51. The current detection circuit 55 detects the feed motor drive current value and the torsion motor drive current value, and the respective detection signals are input to the control device 51. The control device 51 controls the feed motor 13 and the torsion motor 21 based on the time, the motor rotation speed, and the motor drive current value. Note that the rotation speed sensor 54 does not need to detect the rotation pulse of the torsion motor 21 as a method of not performing feedback control. In that case, the number of parts is reduced and the control method is simplified, so that the cost can be reduced.
[0027]
FIG. 17 shows the control steps from the time when the leading end of the binding wire is clamped by the clamping mechanism to the end of the binding wire twisting process, and the initialization operation is caused by turning on the trigger switch (step 101). That is, at the same time when the feed motor 13 is activated, the timer 51a of the control device 51 starts the time count, and measures the wire feed amount (determined from the rotation speed of the feed motor 13).
[0028]
Next, it is determined whether or not a clamping failure has occurred in the previous binding process (step 102). That is, as will be described later, if no cut load is detected, a flag is set with a clamp failure. In step 102, it is determined whether or not a clamp failure has occurred by checking the presence or absence of the flag.
[0029]
For example, in the normal initial state, as shown in FIGS. 1 to 3, the tip of the wire W is introduced to the binding wire guide hole 5 of the cutter block 4. However, when the tip of the wire W is not clamped, the wire W is pulled back along the guide groove of the nose 6 in the wire pulling process as shown in FIG. 19 is pulled out to the vicinity of the meshing portion between the V-groove driven gear 8 and the V-groove drive gear 10 of the bundling wire feed mechanism 1 as shown in FIG.
[0030]
Therefore, in the state where no clamping failure has occurred in the previous binding process, the tip of the wire W is fed out from the binding wire guide hole 5 and bends in a loop along the guide groove of the nose 6, and the lower surface of the clamp plate 28 A predetermined control pulse signal is output from the control device 51 to the forward / reverse drive circuit 52 for the feed motor by the amount of feed from the time until it hits the ceiling of the recess 40 (step 103).
[0031]
Then, the tip of the wire W is clamped by the left clamp plate 28 and the central clamp plate 26 (step 104), and the feed motor 13 is driven in reverse to pull back the wire W (step 105). After that, by driving the torsion motor 21 and the slide motor 22, the binding wire clamp device 25 moves in parallel with respect to the binding wire guide hole 5 of the cutter block 4, and the wire W is cut (step 106). After the wire W is cut, the binding wire clamp device 25 is rotated by the forward rotation drive of the torsion motor 21 to twist the wire W (step 107). After the twist of the wire W is completed, the torsion motor 21 is driven in reverse to return the binding wire clamp device 25 to the initial position, the wire W is released (step 108), and the binding operation for one cycle is completed.
[0032]
FIG. 20 shows a change in the drive current of the torsion motor 21, and a peak current flows at the start of rotation of the torsion motor 21, and the drive current decreases as the rotational speed thereafter increases. When the tip of the wire W is clamped and the process proceeds to a normal twisting process, the drive current temporarily rises sharply as shown in FIG. 4A due to the cutting load of the twisting motor 21 at the time of wire cutting. After that, the drive current gradually decreases, but the drive current increases again again due to the torsional load of the torsion motor 21 at the time of wire twisting. The drive current becomes the lowest with the end of the twisting process.
[0033]
On the other hand, when the tip of the wire W is not clamped, the wire W is pulled to the binding wire feed mechanism 1 in the wire W pulling back process, so that the wire W is inserted into the binding wire guide hole 5 of the cutter block 4. No longer exists. Therefore, even if the torsion motor 21 is driven in reverse and the binding wire clamp device 25 is retracted, no cut load is generated. That is, as shown in FIG. 4 (b), a peak current flows at the start of rotation of the torsion motor 21, and the drive current gradually decreases with the subsequent increase in the number of revolutions. Not detected. In addition, a gentle increase in drive current due to the subsequent torsional load is not detected.
[0034]
As described above, when the cut load is detected from the change in the drive current of the torsion motor 21, it is determined that the normal bundling work has been performed, and the cut load cannot be detected from the change in the drive current of the torsion motor 21. Therefore, it can be determined that the binding wire clamp device 25 could not clamp the tip of the wire W. Since the cut load of the torsion motor 21 is relatively large, there is very little possibility that it is mistaken for a change in drive current due to electrical noise. Therefore, it is possible to obtain a more accurate detection result by detecting the clamping failure from the cut load of the torsion motor 21 than by detecting the clamping failure by changing the drive current of the feed motor 13 as in the conventional type.
[0035]
If the cut load of the torsion motor 21 cannot be detected in step 106 shown in FIG. 17, a flag indicating no cut load is set and the routine proceeds to step 107. This flag is stored in the controller 51 even after one cycle of the bundling operation is completed, and the flag is read when the next bundling operation is started and initialized. If there is this flag in step 102, it is determined that there is no cut load in the previous bundling operation and a clamping failure has occurred, and the process proceeds to step 201.
[0036]
As shown in FIG. 19, when the clamp is defective, the tip of the wire W is drawn to the vicinity of the meshing portion between the V-groove driven gear 8 and the V-groove drive gear 10 of the bundling wire feed mechanism 1 and stops. As shown in FIG. 3, the tip of the wire W must be introduced to the binding wire guide hole 5 of the cutter block 4 which is a normal initial state. Accordingly, the control device 51 performs a predetermined control on the forward / reverse drive circuit 52 for the feed motor by the difference in distance from the tip position of the wire W shown in FIG. 19 to the tip position of the wire W shown in FIG. If a control pulse signal larger than the pulse signal is output (step 201), the tip of the wire W passes through the binding wire guide hole 5 and the nose 6 is moved in the same manner as when the binding operation is started in the normal initial state. It bends in a loop along the guide groove and is sent from the lower surface of the clamp plate 28 until it hits the ceiling of the recess 40.
[0037]
In this way, when a clamping failure occurs, the wire W feeding amount is automatically increased when the next bundling operation is performed, thereby eliminating the need to reload the wire W. Further, when no clamping failure occurs, unnecessary wire feeding is not performed, so that unnecessary wire consumption is eliminated and battery consumption can be suppressed.
[0038]
It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
[0039]
【The invention's effect】
As described in detail in the above embodiment, the invention according to claim 1 measures the driving current of the torsion motor sequentially every unit time in the binding wire pull-back process to the binding wire twisting process, and the cutting is performed. When the increase in the drive current due to the operation of the mechanism is not measured, a control means for detecting that the clamp mechanism could not clamp the tip of the binding wire is provided, so that the drive motor drive current is measured as in the conventional type. Compared to the configuration, the torsional motor has a large cut load, so it is not easily affected by electrical noise, and is extremely accurate even when the remaining battery level, operating temperature, and target reinforcing bar diameter are different. In addition, it is possible to detect a clamping failure at the tip of the binding wire.
[0040]
In the invention according to claim 2, when it is detected that the clamp mechanism has not been able to clamp the tip of the binding wire, the feeding amount is increased by a predetermined length in the next binding wire feeding step, and the In addition to the effect of the first aspect of the invention, in addition to the effect of the first aspect of the invention, even if a clamping failure occurs at the tip of the binding wire, it is automatically detected when the next binding operation occurs. In particular, by increasing the wire feed amount, the wire reloading operation becomes unnecessary. Further, when no clamping failure occurs, unnecessary wire feeding is not performed, so that unnecessary wire consumption is eliminated and battery consumption can be suppressed.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view showing a mechanism part in an initial state of a reinforcing bar binding machine of the present invention.
FIG. 2 is a plan sectional view showing a mechanism portion in an initial state of the reinforcing bar binding machine of the present invention.
FIG. 3 is a front view showing a mechanism portion in an initial state of the reinforcing bar binding machine of the present invention.
4A and 4B show a binding wire feeding mechanism of a reinforcing bar binding machine, where FIG. 4A is a front view, and FIG.
FIGS. 5A and 5B show a binding wire path forming step of the reinforcing bar binding machine, where FIG. 5A is a plan sectional view, FIG. 5B is a front view, and FIG. 5C is a side sectional view.
6A and 6B show a binding wire feeding process, where FIG. 6A is a plan sectional view, FIG. 6B is a front view, and FIG. 6C is a side sectional view.
7A and 7B show a binding wire gripping process, where FIG. 7A is a plan sectional view, FIG. 7B is a front view, and FIG. 7C is a side sectional view.
FIGS. 8A and 8B show a binding wire pull-back process of the binding wire twisting mechanism, where FIG. 8A is a plan sectional view, FIG. 8B is a front view, and FIG. 8C is a side sectional view;
9A and 9B show a binding wire refeeding process, where FIG. 9A is a plan sectional view, FIG. 9B is a front view, and FIG. 9C is a side sectional view.
10A and 10B show a binding wire gripping process, where FIG. 10A is a plan sectional view, FIG. 10B is a front view, and FIG. 10C is a side sectional view.
FIGS. 11A and 11B show a binding wire cutting step, where FIG. 11A is a plan sectional view, FIG. 11B is a front view, and FIG. 11C is a side sectional view;
FIGS. 12A and 12B show a binding wire tension process, where FIG. 12A is a plan sectional view, FIG. 12B is a front view, and FIG. 12C is a side sectional view;
FIG. 13 shows a twisting process, (a) is a front view, and (b) is a side sectional view.
14A and 14B show a twist completed state, where FIG. 14A is a plan sectional view, FIG. 14B is a front view, and FIG. 14C is a side sectional view.
FIGS. 15A and 15B show a binding wire releasing step, where FIG. 15A is a plan sectional view, FIG. 15B is a front view, and FIG. 15C is a side sectional view;
FIG. 16 is a block diagram of an electric circuit of a binding wire feeding mechanism and a binding wire twisting mechanism.
FIG. 17 is a control flowchart from when the tip of the binding wire is clamped by the clamp mechanism to when the binding wire twisting process ends.
FIG. 18 is a side sectional view showing a wire pulling back process when the tip of the wire is not clamped.
FIG. 19 is a front view of a binding wire feed mechanism showing a wire stop state when the tip of the wire is not clamped.
FIGS. 20A and 20B show changes in the drive current of the torsion motor. FIG. 20A is a graph when the tip of the wire is clamped and a normal twisting process is performed, and FIG. 20B is a case where the tip of the wire is not clamped. Graph.
[Explanation of symbols]
1 Bundling wire feed mechanism
2 Binding wire twisting mechanism
3 Nose section
4 Cutter block
5 Binding wire guide hole
6 Nose
7 Base plate
8. 9 V-grooved drive gear
10. 11 V-grooved driven gear
12 Intermediate gear
13 Feed motor
14 Reduction gear
15 Gear holder
16 Long hole
17 pin
18 lever
19 Spring seat
20 Compression coil spring
21 Torsion motor
22 Slide motor
24 Ball screw shaft
25 Binding wire clamp device
26 Center clamp plate
27 Right clamp plate
28 Left clamp plate
29 sleeve
30 Ball retainer ring
31 fins
32 Shifter disc
33 Ball screw shaft
34 Ball retainer ring
35, 36, 37 Guide pin
38 groove cam
39 Cable tie guide groove
40 recesses
51 Control unit
52 Forward / reverse drive circuit for feed motor
53 Forward / reverse drive circuit for torsion motor
54 Speed detection sensor
55 Current detection circuit W Wire S Rebar

Claims (2)

The binding wire is fed out by the binding wire feed mechanism to form a loop around the reinforcing bar, the tip of the binding wire is clamped by the clamping mechanism, the binding wire feed mechanism is driven in reverse, the binding wire is pulled back and wound around the reinforcing bar, and then cut In a reinforcing bar binding machine that binds reinforcing bars by cutting the other end of the binding wire by a mechanism and then rotating the clamp mechanism by twisting the binding wire to twist the binding wire.
A drive current detection circuit for the twisting motor of the binding wire twisting machine is provided, and the driving current of the twisting motor is measured sequentially every unit time from the binding wire pulling back process to the binding wire twisting process. A reinforcing bar binding machine comprising a control means for detecting that the clamp mechanism could not clamp the tip of the binding wire when the rise of the wire is not measured. When the clamp mechanism detects that the leading end of the binding wire could not be clamped, a control means for adjusting the feed amount to an appropriate start position by increasing the feed amount by a predetermined length in the next binding wire sending process. The reinforcing bar binding machine according to claim 1, wherein:

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