JP2012061595A - Brake device of wire reel in reinforcement binding machine, and brake treatment method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake of a wire reel in a reinforcement binding machine capable of improving brake performance and saving power.SOLUTION: The reinforcement binding machine is used for sending a wire from a wire reel rotatably arranged in a binding machine body by a feeding means to be wound around a plurality of reinforcing bars and thereafter twisting and binding the wires. The reinforcement binding machine includes: a brake means 32 to apply braking to the rotation of the wire reel; a detection means 54 to detect a power voltage for starting the feed means; and a control means 50 to make a braking start time of the brake means 32 earlier than a reference time only when the power voltage is not smaller than a predetermined reference value based on the detection result of the detection means 54.

Description

  The present invention relates to a brake device that stops rotation of a wire reel after feeding a binding wire having a predetermined length in a reinforcing bar binding machine, and a brake processing method thereof.

  In the reinforcing bar binding machine, when a predetermined length of wire feeding is performed, the wire feeding stops, but the wire reel continues to rotate due to inertia. Therefore, the diameter of the wire wound around the wire reel swells, which may hinder the next wire feeding. As a solution to this problem, for example, as in Patent Document 1, a hook-shaped brake lever (synonymous with the brake means of Patent Document 1) that can be engaged with the wire reel is disposed in the vicinity of the wire reel. A brake mechanism operated by a solenoid is disclosed. In the brake mechanism of Patent Document 1, after the wire is fed out from the wire reel by a predetermined length, the brake lever is operated by the solenoid to engage the peripheral portion of the wire reel to stop the rotation of the wire reel.

JP-A-11-156746

  Incidentally, in the brake mechanism of the reinforcing bar binding machine shown in FIG. 3 of Patent Document 1, in the configuration in which the brake lever rotates about the support shaft (including a spring), there is a slight amount of time until the brake is operated after the solenoid is operated. A time lag occurs. Further, for example, when a link mechanism (including a spring) is interposed between the brake lever and a solenoid that operates the brake lever, it can be assumed that the time lag becomes larger than that in FIG. In addition, if a battery serving as a power source such as a solenoid saves power, the battery can be effectively used for a long time.

  Therefore, an object of the present invention is to provide a wire reel brake device and a brake processing method thereof in a reinforcing bar binding machine that can improve braking performance and save power.

  In order to achieve the above object, a wire reel brake processing device in a reinforcing bar binding machine according to claim 1 is configured to feed a wire from a wire reel rotatably arranged in a binding machine body by a feeding means to surround a plurality of reinforcing bars. A rebar binding machine that twists and binds the wire after being wound around, a brake unit that applies braking to the rotation of the wire reel, a detection unit that detects a power supply voltage that activates the feed unit, and Control means for making the braking start time of the brake means earlier than the reference time only when the power supply voltage is equal to or higher than a predetermined reference value based on the detection result of the detection means.

  In the wire reel brake processing method in the reinforcing bar binding machine according to claim 2, the wire is fed from a wire reel rotatably arranged on the binding machine body by a feeding means and wound around a plurality of reinforcing bars. A rebar binding machine that twists and binds, and based on the detection result of the detection means for detecting the power supply voltage for starting the feeding means, the wire reel is rotated only when the power supply voltage is equal to or higher than a predetermined reference value. The braking start time of the brake means to be stopped is made earlier than the reference time.

  According to the first and second aspects of the present invention, when the power supply voltage of the feeding means is equal to or higher than a predetermined reference value, the wire feeding speed is increased. Otherwise, the brake application timing will be delayed, but the braking start time of the stopper device for stopping the rotation of the wire reel is made earlier than the reference time only when the power supply voltage of the feeding means is equal to or higher than the predetermined reference value. The brake is applied at an appropriate timing, and the braking performance is improved.

  On the other hand, when the power supply voltage of the feed means is lower than the reference value, the wire feed speed returns to normal, so that the power supply voltage of the feed means exceeds the predetermined reference value during the on-time of the drive source of the feed means such as the solenoid Therefore, the power is saved. That is, according to the present invention, since the brake application timing is changed by the power supply voltage of the feeding means, the inertial rotation of the wire reel can be surely stopped, and unnecessary power consumption can be cut.

It is a whole perspective view which shows the principal part of the reinforcing bar binding machine in 1st Embodiment which concerns on this invention. It is a top view of the reinforcing bar binding machine shown in FIG. It is a side view shown in FIG. It is a principal part top view of the brake device shown in FIG. It is a whole perspective view of the brake device shown in FIG. FIG. 6 is an exploded perspective view of the brake device shown in FIG. 5 and a side view of the reinforcing bar binding machine. It is a principal part top view at the time of the brake operation | movement of the brake device shown in FIG. FIG. 8 is a side view of FIG. 7. It is a block diagram of the reinforcing bar binding machine shown in FIG. It is a flowchart figure of the binding mode of the reinforcing bar binding machine shown in FIG. It is a figure showing the operation timing of the solenoid shown in FIG. It is a flowchart figure of the power saving mode of the reinforcing bar binding machine shown in FIG. It is a flowchart figure of the brake timing change mode of the reinforcing bar binding machine shown in FIG.

  Hereinafter, based on FIG. 1 thru | or FIG. 9, the brake device of the wire reel in the reinforcing bar binding machine which is one Embodiment of this invention is demonstrated. 1 is an overall perspective view showing a main part of a reinforcing bar binding machine according to the present embodiment, FIG. 2 is a plan view of the reinforcing bar binding machine shown in FIG. 1, FIG. 3 is a side view shown in FIG. 1, and FIG. FIG. 5 is an overall perspective view of the brake device shown in FIG. 4, FIG. 6 is an exploded perspective view of the brake device shown in FIG. 5, and FIG. 9 is a block diagram of the reinforcing bar binding machine shown in FIG. is there.

(Schematic configuration of rebar binding machine)
As shown in FIGS. 1 to 3, the reinforcing bar binding machine 10 includes a binding machine body 11 and a wire reel 20 that is detachably disposed on the binding machine body 11. The wire reel 20 is configured to be detachable only by operating a lever (not shown). In the binding machine body 11, passages 12A and 12B (see FIGS. 2 and 3) of the binding wire W are arranged. As shown in FIG. 2, between the passages 12A and 12B, a pair of feed gears 13 constituting a part of the feed means are arranged so as to hold the wire W therebetween. As shown in FIG. 3, the binding machine main body 11 is provided with a feed motor 14 (which constitutes a part of the feed means) that rotates the feed gear 13. Note that a trigger 18 (see FIG. 3) is disposed in the binding machine main body 11, and the feed motor 14 is driven when the trigger 18 is pulled.

  A guide 15 for guiding the wire W (indicated by a two-dot chain line in FIG. 3) to be bent in a loop shape is arranged on the feeding direction side (right side in FIG. 3) of the binding machine body 11. A torsion motor 16 is disposed in the binding machine body 11, and a torsion hook (not shown) is connected to the torsion motor 16. The torsion hook is driven by the rotation of the torsion motor 16 and twists the loop-shaped wire W wound around a plurality of (two in FIG. 3) reinforcing bars 24.

  That is, the torsion hook is configured to rotate forward and advance to the loop-shaped wire W and twist, and after the twist is completed, reversely rotate and retract to the initial position. Further, the wire W that has been twisted is cut by a cutter (not shown) that interlocks with a twisting hook (not shown). Since these mechanisms are the same as conventionally known mechanisms, further detailed description is omitted.

(Brake device configuration)
As shown in FIG. 4, the wire reel 20 includes a pair of flanges 20A and 20B. On one flange 20A, a plurality of substantially saw-tooth shaped engaging portions 21 (see FIG. 3) are formed at predetermined intervals. The stopper lever 30 is disposed so as to correspond to the engaging portion 21. As shown in FIG. 5, the brake device S serving as a brake means includes the stopper lever 30, the solenoid 32, the link 33, the shaft 34, the connecting ring 37, and a torsion coil spring (hereinafter also referred to as a spring) 36. And a hollow pin 38 and a bracket 40. The bracket 40 fixes the solenoid 32 and supports the shaft 34. As shown in FIG. 2, the bracket 40 is disposed in the cover 17 (indicated by a two-dot chain line) of the binding machine body 11.

  As shown in FIG. 5, the iron core 32A of the solenoid 32 is slidably disposed, and when the solenoid 32 is turned on, the iron core 32A is drawn into the solenoid 32 by a length L (see FIG. 7). The iron core 32A when the solenoid 32 is turned off is held at the initial position shown in FIG. The on / off switching of the solenoid 32 is controlled by the CPU 50 (see FIG. 9).

  As shown in FIG. 6, one end of the iron core 32A and the link 33 is connected via a pin 33A. On the other hand, the other end of the link 33 constituting the link mechanism and the connecting ring 37 fixed to the shaft 34 are connected by a pin 33B, and the shaft 34 is rotatably arranged on the bracket 40 via the connecting ring 37. Further, the shaft 34 is inserted into the cylindrical portion 40 </ b> A of the bracket 40. When the iron core 32A and the link 33 slide, the shaft 34 rotates about its axis. The shaft 34 has a D-cut portion 34A that is D-cut at the tip thereof.

  The shaft 34 protruding from the cylindrical portion 40A of the bracket 40 is inserted into the bearing 35, the hollow pin 38, the coil portion 36A of the spring 36, and the D-cut hole 30A of the stopper lever 30. Then, the stopper lever 30 and the like are prevented from coming off the shaft 34 by the stopper 39.

  The D-cut portion 34A of the shaft 34 corresponds to the hole 30A of the stopper lever 30, and the stopper lever 30 rotates about the shaft 34 as the shaft 34 rotates. The stopper lever 30 is formed with a locking portion 31 that engages with the engaging portion 21 of the wire reel 20 in a substantially L shape (see FIG. 3).

  The solenoid 32, the shaft 34, and the bracket 40 shown in FIG. 6 are arranged in the cover 40 shown in FIG. As shown in FIG. 5, the sliding portion of the shaft 34 that rotates the stopper lever 30 is in the cylindrical portion 40 </ b> A of the bracket 40, the bearing 35, and the hollow pin 38. That is, the solenoid 32 and the shaft 34 that rotate the stopper lever 30 are all covered with the cover 17 and the like.

  As shown in FIG. 6, the coil portion 36 </ b> A of the spring 36 is inserted into the coil receiver 38 </ b> A of the hollow pin 38, and the spring 36 is supported by the hollow pin 38. As shown in FIG. 3, the hook portion 36B of the spring 36 is locked to the binding machine body 11, and the hook portion 36C is locked to the outside of the stopper lever 30 (see FIG. 5). Therefore, the spring 36 always urges the stopper lever 30 in the direction of the arrow shown in FIG. 3 (that is, counterclockwise).

  That is, in the stopper device S, the link mechanism is interposed between the stopper lever 30 and the solenoid 32 that operates the stopper lever 30, so that the time lag until the brake is operated is greater than that in FIG. Becomes even larger. The standby mode in the stopper device S, that is, when the solenoid 32 is off, is in the state shown in FIGS.

(Configuration for control system of reinforcing bar binding machine)
As shown in FIG. 9, the reinforcing bar binding machine 10 includes a CPU 50 having a timing function, a memory 52, a battery 53, a sensor 54, a trigger SW (SW is an abbreviation of a switch) 56, and a voltage detection circuit 57. , A solenoid 32, a torsion motor 16, and a feed motor 14. The CPU 50 controls the overall operation of the reinforcing bar binding machine 10. For example, when a switch signal is input from the trigger SW 56 to the CPU 50, the CPU 50 performs a binding process based on the switch signal. Further, as described above, the CPU 50 includes the timer 51 for measuring time. The CPU 50 is a control unit and a counting unit.

  A program for controlling various processes in the reinforcing bar binding machine 10 is recorded in the memory 52 which is a recording unit. For example, the on time of the solenoid 32 is recorded in the memory 52. The sensor 54 is arranged so that the rotation of the feed gear 13 can be detected. In other words, the magnet that rotates together with the feed gear 13 is detected by the Hall IC that is the sensor 54. Then, the sensor 54 detects that the feed gear 13 is half-rotated, and the CPU 50 determines whether or not the wire W has been sent out for a predetermined length, for example, 80 cm, based on the detection signal of the sensor 54 by the number of rotations of the feed gear 13. to decide.

  The battery 53 is a power source for the CPU 50, the solenoid 32, the torsion motor 16, the feed motor 14, and the like, and supplies power for starting the solenoid 32 or the CPU 50. The voltage detection circuit 57 as voltage detection means detects the voltage of the battery 53, and the detection value data as the detection result is input to the CPU 50. Then, the CPU 50 compares the power supply voltage of the battery 53 that is the input detection value data with the reference voltage recorded in the memory 52. The wiring of the battery 53 is not shown except for the voltage detection circuit 57. This is to prevent complication when connecting a plurality of wires to each electronic component such as the CPU 50.

  The trigger SW 56 is configured to be switched on in conjunction with the pulling operation of the trigger 18 shown in FIG. When the trigger SW 56 is turned on, the CPU 50 rotates the feed motor 14, that is, the feed gear 13, and pulls the wire W in the feed direction. That is, the feed motor 14 and the torsion motor 16 are rotationally driven based on the drive signal from the CPU 50. The twisting motor 16 can be rotated forward and backward.

  Further, the solenoid 32 slides the iron core 32 from the initial position (position shown in FIG. 4) in the pull-in direction based on a drive signal (that is, an ON signal) from the CPU 50. When the drive signal is not supplied from the CPU 50, the solenoid 32 is turned off, and the stopper lever 30 shown in FIG. 5 returns to the initial position (position shown in FIG. 3) by the biasing force of the spring 36.

(Operation of this embodiment)
When the trigger 18 of the reinforcing bar binding machine 10 shown in FIG. 3 is pulled, the wire W wound around the wire reel 20 is fed out over a predetermined length by the feed gear 13 and wound around the plurality of reinforcing bars 24. Is done. Then, immediately before the wire W feeding operation is finished, the solenoid 32 is turned on, and the iron core 32A is drawn. By this pull-in operation, the stopper lever 30 rotates in the arrow direction (clockwise direction) in FIG. 8 against the urging force of the spring 36.

  Therefore, as shown in FIG. 8, the locking portion 31 of the stopper lever 30 engages with the engaging portion 21 of the wire reel 20 and stops the rotation of the wire reel 20. Therefore, since the wire reel 20 does not rotate due to inertia, the diameter of the wire W does not swell, and the wire W can be always fed smoothly. 7 is a plan view of an essential part during the braking operation of the brake device S shown in FIG. 4, and FIG. 8 is a side view of FIG.

  After a predetermined time has elapsed, the solenoid 32 is turned off, the stopper lever 30 is rotated in the direction of the arrow in FIG. 3 (counterclockwise direction) by the biasing force of the spring 36, and the iron core 32A is also slid to the initial position (FIG. 4). Thereafter, the torsion motor 16, that is, the torsion hook, is driven based on the drive signal of the CPU 50 shown in FIG. 9, and the wire W is twisted and bound. The CPU 50 outputs a drive signal to the torsion motor 16 after the wire W feeding operation is completed.

  Next, processing related to the above-described bundling process (synonymous with bundling mode) will be described based on the flowchart shown in FIG. Here, the processing in the reinforcing bar binding machine 10 shown in FIG. 1 is executed by the CPU 50 (see FIG. 9) and is represented by the flowchart of FIG. This program is stored in advance in the program area of the memory 52 (see FIG. 9) of the reinforcing bar binding machine 10. FIG. 11 is a diagram showing the operation timing of the solenoid 32 shown in FIG.

(Bundling mode)
In step 100 shown in FIG. 10, it is determined whether or not the trigger SW 56 (see FIG. 9) is on. That is, it is determined whether or not the trigger 18 shown in FIG. 3 is pulled and the trigger SW 56 is turned on. If step 100 is affirmative, that is, if the trigger SW 56 is on, the CPU 50 drives the feed motor 14 in step 102. If step 100 is negative, the process waits for the trigger SW 56 to turn on.

  In step 104, it is determined whether or not the number of rotations of the feed gear 13 shown in FIG. 2 has reached a reference value (synonymous with “predetermined feed amount before a predetermined length” in claim 1 or 2). Here, the reference value is a reference number for determining whether or not the number of rotations at which the feed gear 13 feeds the wire W to a predetermined feed amount before a predetermined length has been reached.

  That is, by detecting the rotation of the feed gear 13 by the sensor 54 shown in FIG. 9, the CPU 50 determines whether or not the feed gear 13 has rotated a reference value, for example, 17 times. If step 104 is positive, that is, if the number of rotations of the feed gear 13 has reached the reference number, in step 106, the solenoid 32 shown in FIG. If step 104 is negative, the process waits until the number of rotations of the feed gear 13 reaches the reference number.

  In step 108, it is determined whether or not the number of rotations of the feed gear 13 has reached a reference value (for example, 17 and a half rotations). Here, the reference value is a reference number for determining whether or not the number of rotations at which the feed gear 13 feeds the wire W by a predetermined length has been reached. That is, in step 108, it is determined whether or not half rotation has been performed from the reference rotation (17 rotations) in step 104.

  If step 108 is positive, that is, if the number of rotations of the feed gear 13 has reached the reference number, in step 110, the CPU 50 stops the feed motor 14 and starts counting time by the timer 51 shown in FIG. Here, the reason why the solenoid 32 is turned on immediately before the end of wire feeding is to consider the time lag from the operation of the solenoid 32 until the wire reel 20 is braked. If step 108 is negative, the process waits for the rotation of the feed gear 13 to reach the reference number.

  In step 112, the CPU 50 determines whether or not the count value of the timer 51 has reached a reference value for brake release time, for example, 0.1 seconds (see FIG. 11). If step 112 is affirmative, that is, if the brake release time (count value is 0.1 second) is reached, in step 114, the solenoid 32 is turned off.

  If step 112 is negative, wait until the reference time is reached. Here, the reason why the wire reel 20 is braked for 0.1 second is that it is a brake release time necessary for reliably stopping the rotation of the wire reel 20 in the experiment. The brake release time can be arbitrarily changed, such as 0.08 seconds or 0.12 seconds, by changing the configuration of the link mechanism of the stopper device S.

  In step 116, a twisting process is performed. The twisting process is a process of driving the torsion motor 16 in a normal direction and twisting a wire W (see a two-dot chain line in FIG. 3) wound around a plurality of crossed reinforcing bars 24 (see FIG. 3) with a torsion hook (not shown). The twisting motor 10 is reversely driven to return the twisting hook to the initial position. And when the process of step 116 is complete | finished, the process of this flowchart is complete | finished. The bundling mode shown in FIG. 10 is repeated every time the trigger SW 56 is turned on.

  According to the present embodiment, after the wire W is fed by the feed gear 13 to a predetermined feed amount before the predetermined length (the reference number of times in step 104), braking is started by the stopper device S against the rotation of the wire reel 20. Therefore, the time lag at the time of braking the wire reel 20 can be reduced, and the braking performance is improved.

  In the following, processing relating to the power saving mode and the brake timing change mode in the reinforcing bar binding machine 10 will be described based on the flowcharts shown in FIGS. 12 and 13.

(Power saving mode)
In step 120 shown in FIG. 12, it is determined whether or not the trigger SW 56 is on. If step 100 is positive, that is, if the trigger 18 is pulled, the CPU 50 drives the feed motor 14 in step 122. In step 124, the number of times of binding is read from the memory 52 shown in FIG. Here, regarding the counting of the number of times of binding, every time the wire reel 20 shown in FIG. 1 is loaded into the binding machine main body 11, the CPU 50 serving as a counting means resets the count value of the number of times of binding in the storage area of the memory 52 and counts it. Start. In addition, the wire W wound around the wire reel 20 can generally be bundled 120 times.

  In step 126, it is determined whether the number of times of binding is equal to or less than a reference value. That is, the CPU 50 determines whether a reference value, for example, a count value is 40 times or less. If step 126 is positive, that is, if the count value is 40 times or less, in step 128, the CPU 50 performs a brake process. This brake process is a process from step 104 to step 114 shown in FIG.

  After the brake process in step 128 is completed, a torsion process (the same process as step 116 in FIG. 10) is performed in step 130. If step 126 is negative, that is, if the count value is 40 times or more, the process proceeds to step 130. That is, when step 126 is negative, the brake process of step 128 is omitted. Here, the brake process is performed only when the count value is less than 40 times because the difference in the maximum winding diameter of the wire W and the outer diameter of the flanges 20A and 20B of the wire reel 20 is small. This is because when the inertia rotates, the wire W protrudes from the flanges 20A and 20B, and the next wire feed is hindered.

  On the other hand, when the count value is 40 times or more, the brake process is omitted because the difference between the maximum winding diameter of the wire W and the outer diameters of the flanges 20A and 20B of the wire reel 20 is large. This is because the wire W does not protrude from the flanges 20A and 20B.

  After the twisting process in step 130 is completed, the number of times of binding is counted in step 132. That is, the CPU 50 sets the count value to 21 by incrementing 1 to the current count value, eg, 20. In step 134, the count value, for example, 21 is recorded in the memory 52. The recorded count value is read out in the next step 124. When the process of step 134 is finished, the process of this flowchart is finished. The power saving mode shown in FIG. 12 is repeated each time the trigger SW 56 is turned on.

  In the present embodiment, the wire reel is used only when the number of times that the wire W fed by the feed gear 13 is twisted and bound is equal to or less than the reference value (specifically, when step 126 is positive). The rotation of 20 is braked by the stopper device S. That is, according to the present embodiment, when the number of times the wire W having a predetermined length is bundled more than the reference number (specifically, when step 126 is negative), the brake process is omitted, so that power is saved. The use time of the battery 53 shown in FIG. 9 is extended, and the battery 53 can be effectively used for a long time.

(Brake timing change mode)
In step 140 shown in FIG. 13, it is determined whether or not the trigger SW 56 is on. If step 140 is positive, that is, if the trigger 18 is pulled, the CPU 50 drives the feed motor 14 in step 142. In step 144, the CPU 50 detects the voltage value of the battery 53 via the voltage detection circuit 57 shown in FIG. That is, the CPU 50 reads the voltage value data input from the voltage detection circuit 57. Here, the battery voltage is, for example, 16 V in the case of full charge (that is, synonymous with the highest voltage), and the lowest voltage (that is, the voltage immediately before the power is turned off) is, for example, 14.4 V. And the memory 52 shown in FIG. 9 has memorize | stored the reference value of battery voltage as 15V, for example in the storage area.

  In step 146, it is determined whether or not the battery voltage value is equal to or less than a reference value. That is, the CPU 50 determines whether or not the battery voltage is 15V or less. If step 146 is positive, that is, if the battery voltage value is 15 V or less, in step 148, the CPU 50 sets the drive start timing (synonymous with braking start time) of the solenoid 32 shown in FIG. Rotation). That is, the solenoid 32 is driven by 17 rotations and the brake is applied.

  If step 146 is negative, that is, if the battery voltage value is 15 V or more, in step 150, the drive start timing of the solenoid 32 is made earlier than the reference rotation (17 rotations). For example, in order to make the braking start time of the stopper device S earlier than the reference time, the solenoid 32 is driven at a reference value of 16 and a half and the brake is applied.

  Here, the reason why the processing of step 150 is provided is that when the battery voltage is higher than the reference value, the feeding speed of the wire W is increased, so that it is necessary to advance the timing at which the wire reel 20 is braked. In this case, since the end of the current flowing through the solenoid 32 is the same as that in the example shown in FIG. 11, the on-time of the solenoid 32 becomes longer as a result.

  On the other hand, when the battery voltage is lower than the reference value, the feeding speed of the wire W returns to normal (synonymous with the standard), and is therefore the same as the example of FIG. That is, the on-time of the solenoid 32 is shorter than that in step 150, so that power is saved. Therefore, since the brake application timing is changed according to the battery voltage, the inertial rotation of the wire reel 20 can be surely stopped, and unnecessary power consumption can be cut.

  After the process of step 148 or step 150 is completed, a brake process is performed in step 152. This brake process is a process from step 104 to step 114 shown in FIG. After the braking process in step 152 is completed, a torsion process (the same process as step 116 in FIG. 10) is performed in step 154. When the twisting process in step 154 is finished, the process of this flowchart is finished. The brake timing change mode shown in FIG. 13 is repeated every time the trigger SW 56 is turned on.

  In the present embodiment, when the power supply voltage of the battery 53 is equal to or higher than a predetermined reference value (when step 146 is negative), the feed speed of the wire W is increased, and therefore the timing at which the wire reel 20 is braked by the increased speed. If not, the timing for applying the brake will be delayed. That is, according to the present embodiment, the braking start time of the stopper device S that stops the rotation of the wire reel 20 is made earlier than the reference time only when the power supply voltage of the battery 53 is equal to or higher than a predetermined reference value. The brake is applied at the timing, improving the braking performance.

  On the other hand, in this embodiment, when the battery voltage is lower than the reference value (when step 146 is affirmative), the feed speed of the wire W returns to normal, so the on-time of the solenoid 32 is shorter than that of step 150. It becomes power saving. That is, according to the present embodiment, the brake application timing is changed by the battery voltage, so that the inertial rotation of the wire reel 20 can be stopped reliably and unnecessary power consumption can be cut.

  The power source for driving the stopper lever 30 may be a motor or the like in addition to the solenoid 32. Further, due to a change in the configuration of the link mechanism interposed between the stopper lever 30 and its drive source, the predetermined feed amount in claim 1 or claim 2, for example, the reference value of the number of rotations of the feed gear 13 (see step 104) is Settings can be changed arbitrarily.

  The processing flow of each program described in the above embodiment (see FIGS. 10, 12, and 13) is an example, and can be changed as appropriate without departing from the gist of the present embodiment. That is, the bundling mode, the power saving mode, or the brake timing change mode may be arbitrarily combined.

DESCRIPTION OF SYMBOLS 10 Rebar tying machine 11 Rebar tying machine body 13 Feeding gear (feeding means)
14 Feed motor (feed means)
20 Wire reel 21 Wire reel engaging portion 24 Reinforcing bar 30 Stopper lever (brake means)
32 Solenoid (brake means)
50 CPU (control means or counting means)
52 Memory (Recording means)
53 Battery (Power supply for feeding means)
57 Voltage detection circuit (voltage detection means)
S Stopper device W Wire

Claims (2)

A rebar bundling machine that twists and bundles the wires after winding the wire around a plurality of rebars by feeding the wire from a wire reel rotatably arranged on the bundling machine body,
Braking means for applying braking to the rotation of the wire reel;
Detecting means for detecting a power supply voltage for activating the feeding means;
In a reinforcing bar binding machine, comprising: a control unit that sets a braking start time of the brake unit earlier than a reference time only when the power supply voltage is equal to or higher than a predetermined reference value based on a detection result of the detection unit. Wire reel brake device. A rebar bundling machine that twists and bundles the wires after winding the wire around a plurality of rebars by feeding the wire from a wire reel rotatably arranged on the bundling machine body,
Based on the detection result of the detecting means for detecting the power supply voltage for starting the feeding means, the braking start time of the brake means for stopping the rotation of the wire reel is determined from the reference time only when the power supply voltage is equal to or higher than a predetermined reference value. A wire reel brake processing method in a reinforcing bar binding machine, characterized in that the method is also faster.

Images