JP2013227728A - Reinforcement binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement binding machine capable of shortening a binding work time by increasing a wire delivery speed as much as possible, and capable of solving the problem that wires cannot be gripped by gripping means because the wire delivery speed is too high.SOLUTION: In a reinforcement binding machine 10, a plurality of wires W are delivered from a wire reel 20 rotatably arranged in a binding machine body 11 by a given length and wound around circumferences of reinforcements R, and then the wires W are gripped and bound. The reinforcement binding machine 10 comprises: delivery means 12 for delivering the wires W from the wire reel 20; brake means 30 for applying braking to the rotation of the wire reel 20; and control means 100 for controlling the delivery means 12 and the brake means 30. The control means 100 changes the delivery speed of the delivery means 12 while the delivery means 12 is actuated for delivery operation of the wires W.

Description

  The present invention relates to a reinforcing bar binding machine, and more particularly to a reinforcing bar binding machine characterized by wire feed processing and brake processing.

  In this type of reinforcing bar binding machine, the wire is fed from the wire reel by the feeding means, and the fed wire is curled so as to surround the periphery of the reinforcing bar in the curl forming portion. When the wire feed of a predetermined length is performed, the wire feed stops, and the wires are twisted and bound so that the reinforcing bars are tightened by the twisting means.

  In the above processing, the wire reel continues to rotate due to inertia even after the wire feed is stopped. For this reason, the brake means which applies a brake with respect to rotation of a wire reel is provided, and rotation of a wire reel is stopped (for example, patent document 1).

JP 2009-275489 A

  By the way, in such a reinforcing bar binding machine, if the feed speed of the wire fed to the curl forming portion is too fast, the curled wire is greatly shaken by the inertia when the wire feed is stopped, and the twisting means grabs the wire. The problem of damage may occur. However, if the wire feed speed is too slow, the bundling operation time becomes long. For this reason, there are conflicting demands such as slowing the feeding speed to reliably grasp the wire, or increasing the feeding speed and shortening the binding work time.

  Therefore, the present invention reduces the bundling work time by making the wire feeding speed as fast as possible, and avoids the problem that the wire feeding speed is too fast and the twisting means may miss the wire. It is an object of the present invention to provide a reinforcing bar binding machine that can be used.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

  That is, the reinforcing bar binding machine according to claim 1 is a reinforcing bar binding machine for twisting and binding the wire after feeding the wire for a predetermined length from a wire reel rotatably arranged in the binding machine body, A feed means for feeding the wire from the wire reel; a brake means for applying a brake to the rotation of the wire reel; and a control means for controlling the feed means and the brake means. The feeding speed of the feeding means is changed during the operation of feeding the wire by the means.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

  That is, braking by the brake means is started after the feed speed of the feed means is lowered.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.

  That is, the control means starts braking by the brake means before the feeding means stops.

(Claim 4)
The invention according to claim 4 is characterized by the following points in addition to the features of the invention according to any one of claims 1 to 3.

  That is, the control means determines the timing for lowering the feed speed of the feed means according to the feed speed before the feed speed is lowered.

(Claim 5)
The invention according to claim 5 is characterized by the following points in addition to the features of the invention according to any one of claims 1 to 4.

That is, the control means determines the timing for starting braking by the brake means in accordance with the feed speed before the feed speed is reduced.
(Claim 6)
The invention described in claim 6 is characterized by the following points in addition to the features of the invention described in any one of claims 1-4.

  That is, the control means determines the timing for starting braking by the brake means in accordance with the rotational load of the wire reel and the inertial force of the wire reel.

  The invention according to claim 1 is as described above, and the control means changes the feeding speed of the feeding means while the wire feeding operation by the feeding means is in operation. For this reason, the wire feeding speed can be increased as much as possible until the feeding speed is changed gradually or stepwise to shorten the binding work time. In addition, since the feeding speed of the feeding means can be reduced at the end of the feeding process, the wire can be prevented from shaking due to excessive inertia when the wire feeding is stopped, and the twisting means cannot grasp the wire. The problem can be avoided.

  The invention according to claim 2 is as described above, and braking by the brake means is started after the feed speed of the feed means is lowered. For this reason, the rotation peripheral speed of the wire reel can be decreased following the decrease in the feed speed, and the gap between the feed speed and the rotation peripheral speed of the wire reel can be reduced to suppress the slack of the wire. .

  The invention according to claim 3 is as described above, and the control means starts braking by the brake means before the feeding means stops. By this control, even if the wire reel rotates too much because the feed speed is reduced and the wire reel rotates too much, braking by the brake means is started before the feed means stops. As a result, a period in which the feed speed is higher than the rotational peripheral speed of the wire reel can be provided, so that the sag of the wire can be eliminated in this period. For example, even when the wire feed speed suddenly decelerates, the wire reel rotates due to inertia and does not decelerate, and even if the wire is loosened and slackened by the difference, the wire sticks out of the wire reel. Can be avoided.

  The invention according to claim 4 is as described above, and the control means determines the timing for lowering the feed speed of the feed means according to the feed speed before the feed speed is lowered. Thereby, the timing which reduces a feed rate can be made into an appropriate timing.

  In other words, in order to securely grasp the wire by the twisting means, it is necessary to decelerate more than the target speed. On the other hand, in order to shorten the bundling work time by making the wire feeding speed as fast as possible, the feeding speed is reduced. It is better to delay the timing of the reduction as much as possible, and it is necessary to avoid making the timing of the deceleration start earlier than necessary. By determining the timing to reduce the feed speed of the feed means according to the feed speed before the feed speed is lowered, the timing that is as slow as possible and capable of decelerating beyond the target speed is determined. The delivery speed can be reduced at an appropriate timing.

  The invention according to claim 5 is as described above, and the control means determines the timing for starting braking by the brake means according to the feed speed before the feed speed is lowered. Thereby, the timing which starts the braking by a brake means can be made into an appropriate timing.

  That is, by determining the timing for reducing the feeding speed of the feeding means according to the feeding speed before the feeding speed is lowered, the timing at which it is possible to decelerate more slowly than the target speed as much as possible is determined. Braking by the brake means can be started at this appropriate timing.

  The invention according to claim 6 is as described above, and the control means determines a timing for starting braking by the brake means in accordance with a rotational load of the wire reel and an inertial force of the wire reel. To do. Thereby, the timing which starts the braking by a brake means can be made into an appropriate timing.

  That is, if the timing of starting the braking by the brake means is too late, the wire is loosened from the wire reel, whereas if it is too early, it becomes impossible to feed the required amount of wire, so it is necessary to perform it at an appropriate timing. By determining the timing for starting braking by the brake means according to the rotational load of the wire reel and the inertial force of the wire reel, braking by the braking means can be started at an appropriate timing.

It is a cross-sectional perspective view of a reinforcing bar binding machine. It is a principal part top view of a reinforcing bar binding machine. It is side view sectional drawing of a reinforcing bar binding machine. It is a partially cutaway sectional view of the vicinity of a curl forming portion showing a state after the wire is fed out. It is a partially cutaway sectional view of the vicinity of a curl forming portion showing a state after a wire is grasped by a twist hook. It is a partially cutaway sectional view of the vicinity of the curl forming portion showing a state after the wire is fed out in a swaying state. It is a partially cutaway sectional view of the vicinity of a curl forming portion showing a state after a wire in a swayed state is grasped by a torsion hook. It is a graph which shows the relationship between the feed speed and the rotational peripheral speed of a wire reel at the time of making the feed speed of a feed means fall and starting braking by a brake means simultaneously with the stop of a feed means. It is a graph which shows the relationship between a feed speed and the rotational peripheral speed of a wire reel at the time of starting the braking by a brake means, before reducing the feed speed of a feed means and stopping a feed means. It is a graph which shows the relationship between a motor rotational speed and the load torque which generate | occur | produces by wire feeding. It is a graph which shows the relationship between a motor rotational speed and the load torque which generate | occur | produces by wire feeding, Comprising: It is a graph explaining the fall of the motor rotational speed by load torque. It is a table for determining the start timing of braking by the brake means. It is a graph which shows the relationship between the feed speed and feed time of a wire. It is a control block diagram of a reinforcing bar binding machine.

  Embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the reinforcing bar binding machine 10 according to the present embodiment feeds a wire W from a wire reel 20 rotatably arranged on the binding machine body 11 to a predetermined length, and a plurality of wires W are rebars. After winding around R, a plurality of bundles of the wires W are twisted and bound.

  The wire reel 20 is used by being attached to the binding machine body 11 so as to be rotatable, and is configured to be detachable from the binding machine body 11 only by operating a lever (not shown). A wire W for binding is wound around the wire reel 20, and after the wire reel 20 is mounted on the binding machine body 11, the wire W wound around the wire reel 20 is pulled out and set. Yes.

  The wire W pulled out and set is sandwiched between the pair of feed gears 13. The pair of feed gears 13 is operated by a feed motor 14 to feed the wire W in the distal direction. The pair of feed gears 13 and the feed motor 14 feeds the wire W from the wire reel 20. A feeding means 12 is configured. The feed motor 14 operates when the trigger 18 is pulled.

  A curl forming portion 15 that guides the wire W to be bent in a loop shape is disposed on the feeding direction side of the binding machine body 11. The wire W fed to the curl forming unit 15 is curled so that the plurality of wires W surround the rebar R by sliding along the curl forming unit 15.

  A torsion motor 16 is disposed in the binding machine body 11. The torsion hook 17 is actuated by the torsion motor 16. The torsion hook 17 is driven by the rotation of the torsion motor 16, and twists a bundle of a plurality of loop-shaped wires W wound around the reinforcing bar R. The wire W that has been twisted is cut by a cutter (not shown) that interlocks with the twisting hook 17.

  As shown in FIG. 3, the wire reel 20 is provided with a flange 20A on the side, and a plurality of substantially saw-tooth engaging portions 20B are formed at predetermined intervals on the flange 20A. The engaging portion 20B faces the stopper lever 31 of the binding machine main body 11.

  The stopper lever 31 swings with the solenoid 32 as a drive source, and includes a locking portion 31A at the tip. By engaging the engaging portion 31A with the engaging portion 20B of the wire reel 20, braking can be applied to the rotation of the wire reel 20, that is, the stopper lever 31 and the solenoid 32. And the brake means 30 of this embodiment is comprised.

  The feeding means 12 and the brake means 30 described above are controlled by a control means 100 (see FIG. 14) built in the binding machine body 11.

  Although not particularly illustrated, the control unit 100 is configured around a CPU and includes a ROM, a RAM, an I / O, and the like. Then, the CPU is configured to control various input devices and output devices by reading a program stored in the ROM.

  As an input device of the control means 100 according to the present embodiment, as shown in FIG. 14, a trigger 18, a voltage detection means 110, a motor rotation detection means 120, and a reel rotation detection means 130 are provided. In addition, as an input device, it is not limited to the input device shown in this FIG. 14, You may provide another input device.

  Among these, the voltage detection unit 110 detects a voltage applied to the feed motor 14 and can output the detected voltage value to the control unit 100 as a signal.

  The motor rotation detecting means 120 detects the rotation of the feed motor 14, and specifically includes an optical sensor. The rotation of the feed motor 14 detected by the motor rotation detection unit 120 is output to the control unit 100 as a signal. The control means 100 calculates the rotation period by comparing the rotation of the feed motor 14 received from the motor rotation detection means 120 with the value of the CPU timer, and calculates the rotation speed of the feed motor 14 (feed speed of the feed means 12). It can be done.

  The reel rotation detection means 130 detects the rotation of the wire reel 20, and specifically includes an optical sensor. The rotation of the wire reel 20 detected by the reel rotation detection unit 130 is output to the control unit 100 as a signal. The control unit 100 estimates the diameter of the wire W drawing position (that is, the remaining amount of the wire W) by comparing the rotation number of the wire reel 20 received from the reel rotation detection unit 130 with the rotation number of the feed motor 14.

  On the other hand, as an output device of the control means 100 according to the present embodiment, a feed motor 14, a torsion motor 16, and a solenoid 32 are provided as shown in FIG. The output device is not limited to the output device shown in FIG. 14 and may include other output devices.

  The output device described above is controlled as follows. First, when receiving the operation signal of the trigger 18, the control means 100 activates the feed motor 14 and starts feeding the wire W. Then, based on the timing which lowers the feed rate mentioned later, the applied voltage to the feed motor 14 is lowered | hung and the feed rate of the feed means 12 is lowered. Thereafter, the solenoid 32 is actuated to apply a brake to the wire reel 20 based on a braking start timing by a brake means 30 described later. After that, when it is detected that the wire W has been fed out for a predetermined length based on the signal from the motor rotation detecting means 120, the feed motor 14 is completely stopped, the torsion motor 16 is actuated to twist the wire W, and the binding is performed. The cut wire W is cut off from the wire reel 20, and the binding is completed.

  Here, the control unit 100 according to the present embodiment reduces the feeding speed of the feeding unit 12 while the feeding operation of the wire W by the feeding unit 12 is in operation. This is because if the feeding speed of the wire W is too fast, the inertia when the feeding of the wire W is stopped increases and the wire W shakes, and the torsion hook 17 that operates immediately after stopping the feeding of the wire W grabs the wire W. This is to avoid the problem of losing.

  That is, when the feeding speed of the feeding means 12 is slow, as shown in FIGS. 4 and 5, the wire W will not be shaken because the inertial force is small. Can grab. On the other hand, when the feed speed of the feed means 12 is fast, as shown in FIGS. 6 and 7, the wire W is shaken due to the large inertial force, and the predetermined position is reached even when the torsion hook 17 is actuated. Since the wire W is not stable, the bundle of the wires W may not be reliably grasped by the torsion hook 17. However, if the feeding speed is reduced to avoid this problem, the bundling work time becomes longer because the feeding process occupying most of the bundling work time becomes longer. In order to avoid such a problem, the reinforcing bar binding machine 10 according to the present embodiment can reduce the binding work time by changing the feed speed gradually or stepwise during the feed process. The wire W is reliably held by the torsion hook 17.

  In addition, the control unit 100 according to the present embodiment starts braking by the brake unit 30 after the feed unit 12 has been lowered and before the feed unit 12 stops. This is to avoid the problem that the wire W protrudes outside the wire reel 20.

  That is, as shown in FIG. 8, when the feeding speed Va of the wire W by the feeding means 12 is suddenly decelerated, the wire reel 20 continues to rotate due to inertia and does not decelerate, only the difference with respect to the rotational peripheral speed Vb of the wire reel 20. The wire W is loosened and sagging. Even in such a case, the wire W 20 is braked by the brake means 30 so that the rotational peripheral speed Vb of the wire reel 20 substantially coincides with the trajectory of the speed change of the feed speed Va of the feed means 12, and the slack of the wire W is applied by applying a load brake. Although it is possible to eliminate them, for example, fluctuations due to the weight of the wire reel 20, the drawing position of the wire W of the wire reel 20, and the like must be taken into account successively, and the control becomes complicated. In the present embodiment, as shown in FIG. 9, after the feed speed Va of the feed means 12 is lowered, before the feed means 12 stops, the braking by the brake means 30 is started, so that the rotation circumference of the wire reel 20 is increased. A period in which the feed speed Va exceeds the speed Vb is provided, and the slack of the wire W is absorbed during this period.

(Start timing of braking by the brake means 30)
When the braking start timing by the brake means 30 is too late, the wire W is loosened from the wire reel 20 and becomes slack. On the other hand, if it is too early, the necessary amount of the wire W cannot be fed. There is. In the present embodiment, the braking start timing by the brake means 30 is made variable, and the control means 100 appropriately sets this timing so that braking by the brake means 30 is started at an appropriate timing.

  In the present embodiment, the amount of idle rotation of the wire reel 20 after the feed speed of the wire W is decelerated is determined predominantly by the rotational load of the wire reel 20 and the inertial force of the wire reel 20 (note that the feed of the wire W) Since the speed is decelerated to a constant value regardless of the voltage at the end of feeding, the idling amount of the wire reel 20 is not affected by the voltage). For this reason, the start timing of braking by the brake means 30 is determined according to the rotational load of the wire reel 20 and the inertial force of the wire reel 20.

  Specifically, when the rotational load of the wire reel 20 is large, the rotational speed of the wire reel 20 tends to decrease, and the sag of the wire W decreases. For this reason, when the rotational load of the wire reel 20 is large, it is necessary to delay the brake timing of the wire reel 20 in order to balance the generation of the slack of the wire W and the absorption of the slack of the wire W. On the other hand, when the rotational load of the wire reel 20 is small, the rotational speed of the wire reel 20 is difficult to decrease and the sag of the wire W increases, so that the generation of the sag of the wire W and the absorption of the sag of the wire W are balanced. In addition, the brake timing of the wire reel 20 needs to be advanced.

  For this reason, the rotational load of the wire reel 20 is obtained as a load torque to the feed motor 14 from the voltage applied to the feed motor 14 and the rotational speed information of the feed motor 14 when the wire W is fed, and the brake of the wire reel 20 is determined. Used to determine timing.

  Here, since the feed motor 14 uses a DC motor, as shown in FIG. 10, the load torque and the motor rotation speed have a linear function relationship, and the inclination thereof (a constant determined by the feed motor 14 and the feed gear 13). ) Is almost constant regardless of the voltage. When a load torque is generated on the wire reel 20, the motor rotation speed decreases according to the load torque as shown in FIG.

  From the above, the following relationship is obtained. Here, R represents winding resistance, Ke represents a counter electromotive force constant, and Kt represents a torque constant.

(Expression 1) Motor rotation speed = No load rotation speed−R / (Ke × Kt) × Load torque (Expression 2) No load rotation speed = Applied voltage / Ke
When the above (Formula 1) and (Formula 2) are arranged, the following formula is obtained.

(Expression 3) R / Kt × load torque = applied voltage−motor rotational speed × Ke
In this way, by using the back electromotive force constant Ke, a value corresponding to the load torque can be estimated from the applied voltage and the motor rotation speed. By using Equation 3, the control unit 100 obtains the value of the load torque based on the input from the voltage detection unit 110 and the input from the motor rotation detection unit 120.

  Further, the inertial force of the wire reel 20 also affects the deceleration gradient of the wire reel 20 and changes the balance between the generation of the slack of the wire W and the absorption of the slack of the wire W. It is necessary to change the brake timing.

  The inertial force of the wire reel 20 is obtained based on the weight of the wire reel 20, the diameter of the wire W drawing position, and the angular velocity of the wire reel 20.

  Among these, the weight of the wire reel 20 and the diameter of the drawing position of the wire W depend on the remaining amount of the wire W.

  Further, the angular velocity of the wire reel 20 varies depending on the diameter of the wire W drawing position, the characteristics of the feed motor 14, and the voltage applied to the feed motor 14. In the present embodiment, the wire due to the change in the drawing position of the wire W rather than the influence on the angular velocity of the wire reel 20 due to the change in the feed speed of the wire W due to the characteristics of the feed motor 14 and the voltage applied to the feed motor 14. Since the influence on the angular velocity of the reel 20 is large, the angular velocity of the wire reel 20 is determined based on the diameter of the wire W drawing position. The diameter of the drawing position of the wire W depends on being proportional to the remaining amount of the wire W as described above.

  As described above, in this embodiment, the remaining amount of the wire W is used as a representative value for the inertial force evaluation of the wire reel 20. Since the remaining amount of the wire W can be obtained by grasping the diameter of the drawing position of the wire W, it can be obtained from the feed amount of the wire W and the rotation amount of the wire reel 20 within a unit time. That is, the control unit 100 obtains the remaining amount of the wire W (that is, the inertial force of the wire reel 20) based on the feed speed and the input from the reel rotation detection unit 130.

  The control unit 100 determines the braking start timing by the brake unit 30 with reference to the reel brake timing table shown in FIG. 12 based on the load torque and the remaining amount of the wire W obtained as described above.

  For example, when the reel remaining amount is “high” and the load torque is “A or less”, braking by the brake means 30 is started at the timing “a”. When the reel remaining amount is “low” and the load torque is “over C”, braking by the brake means 30 is started at the timing “i”.

  In this embodiment, the remaining amount of reel is set to three stages and the load torque is set to three or more stages. However, this embodiment is merely an example, and the stages are omitted or further divided into stages. Also good.

(Timing to reduce the feeding speed by the feeding means 12)
If the timing of lowering the feeding speed by the feeding means 12 is too slow, the speed is not sufficiently reduced, and the wire W may be missed by the torsion hook 17 in some cases. On the other hand, if the timing is too early, the bundling work time becomes longer due to the effect that the delivery speed of the wire W becomes slower. For this reason, in this embodiment, the timing at which the feeding speed by the feeding means 12 is decreased is variable, and the control means 100 appropriately sets this timing so that the feeding speed is lowered by the feeding means 12 at an appropriate timing. I am doing so.

  In the present embodiment, the timing for lowering the feed speed by the feed means 12 is determined according to the feed speed before the feed speed is lowered.

  Here, the time required to decelerate to the target speed is the same as the speed after deceleration, and the speed variation before the start of deceleration is small relative to the deceleration width. It becomes change in. For this reason, the control means 100 measures the sending speed before starting deceleration based on the signal from the motor rotation detecting means 120, calculates the time required for deceleration from the sending speed before starting deceleration, and the time required for this deceleration. The timing for reducing the feeding speed by the feeding means 12 is determined by calculating backward from the above. Specifically, the time required for deceleration is calculated based on (Equation 4) below (A and B in the equation are constants).

(Expression 4) Time required for deceleration = A × feeding speed before starting deceleration + B
Furthermore, even when aiming at a constant speed during deceleration, it is necessary to change the duty depending on the voltage and the individual feed motor 14. For this reason, the duty is changed using the delivery speed before starting deceleration. Specifically, the duty during deceleration is calculated based on the following (Expression 5) (C and D in the expression are constants).

(Equation 5) Duty during deceleration = C × feeding speed before starting deceleration + D
(Summary)
As described above, according to the present embodiment, the control unit 100 changes the feeding speed of the feeding unit 12 while the feeding operation of the wire W by the feeding unit 12 is in operation. For this reason, it is possible to shorten the bundling work time by increasing the wire W feed speed as much as possible until the feed speed is lowered. Further, since the feeding speed of the feeding means 12 decreases at the end of the feeding process, it is possible to avoid the problem that the fed wire W may be shaken and the torsion hook 17 may fail to grasp the wire W. .

  Further, since the braking by the brake means 30 is started after the feed speed of the feed means 12 is lowered, the rotational peripheral speed of the wire reel 20 can be lowered following the drop of the feed speed. The gap with the rotational peripheral speed of the reel 20 can be reduced to suppress the sag of the wire W.

  Further, the control means 100 starts braking by the brake means 30 before the feeding means 12 stops. As a result, even when the wire reel 20 rotates due to inertia when the wire W feed speed suddenly decelerates and the wire W loosens and becomes slack, the period during which the feed speed exceeds the rotational peripheral speed of the wire reel 20 is increased. Since it can be provided, sagging of the wire W can be eliminated during this period.

  Further, since the control means 100 determines the timing for reducing the feed speed of the feed means 12 according to the feed speed before the feed speed is lowered, the timing for reducing the feed speed is set to an appropriate timing. can do.

  Further, the control means 100 determines the timing for starting the braking by the brake means 30 according to the rotational load of the wire reel 20 and the inertial force of the wire reel 20, so that the braking by the brake means 30 is performed. It is possible to set an appropriate timing for starting the process.

  In the above-described embodiment, a plurality of wires W are curled and wound around the reinforcing bar R. For example, a single wire W having a large wire diameter may be curled and wound.

DESCRIPTION OF SYMBOLS 10 Rebar binding machine 11 Binding machine main body 12 Feeding means 13 Feeding gear 14 Feeding motor 15 Curl formation part 16 Torsion motor 17 Torsion hook 18 Trigger 20 Wire reel 20A Flange 20B Engagement part 30 Brake means 31 Stopper lever 31A Locking part 32 Solenoid DESCRIPTION OF SYMBOLS 100 Control means 110 Voltage detection means 120 Motor rotation detection means 130 Reel rotation detection means W Wire R Rebar

Claims (6)

A rebar binding machine for twisting and binding the wire after feeding the wire a predetermined length from a wire reel rotatably arranged in the binding machine body,
Feeding means for feeding out the wire from the wire reel;
Braking means for applying braking to the rotation of the wire reel;
Control means for controlling the feeding means and the brake means;
With
The said control means changes the feed speed of the said feed means, while the feed operation of the said wire by the said feed means is act | operating, The reinforcing bar binding machine characterized by the above-mentioned.   The reinforcing bar binding machine according to claim 1, wherein braking by the brake means is started after the feed speed of the feed means is lowered.   The reinforcing bar binding machine according to claim 1 or 2, wherein the control means starts braking by the brake means before the feeding means stops.   The said control means determines the timing which reduces the feed rate of the said feed means according to the feed rate before reducing a feed rate, The reinforcing bar binding in any one of Claims 1-3 characterized by the above-mentioned. Machine.   The reinforcing bar binding machine according to any one of claims 1 to 4, wherein the control means determines a timing for starting braking by the brake means in accordance with a feed speed before the feed speed is reduced. .   5. The control unit according to claim 1, wherein the control unit determines a timing for starting braking by the brake unit according to a rotational load of the wire reel and an inertial force of the wire reel. The rebar binding machine described.

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