JP6930097B2 - Cable ties - Google Patents

Description

The present invention relates to a binding machine that binds a binding object such as a reinforcing bar with a wire.

Conventionally, a binding machine called a reinforcing bar binding machine has been proposed in which a wire is wound around a reinforcing bar and the wire is twisted to bind a plurality of reinforcing bars.

Conventionally, in this type of reinforcing bar binding machine, a wire is fed from a wire reel by a feeding means, and the fed wire is curled so as to surround the reinforcing bar at a curl forming portion. Then, when the wire feed of a predetermined length is performed, the wire feed is stopped, and the wire is twisted and bound so as to tighten the reinforcing bar by the twisting means. At this time, since the wire reel continues to rotate due to inertia even after the wire feed is stopped, a braking means for applying braking to the rotation of the wire reel is provided to regulate the rotation of the wire reel.

A technique using a dedicated solenoid has been proposed as a drive source for the braking means (see, for example, Patent Document 1). Further, a technique has been proposed in which a twisting motor for driving a twisting means also serves as a driving source for the braking means (see, for example, Patent Document 2).

Patent No. 5369846 Patent No. 3531150

Since the technique described in Patent Document 1 requires a drive source dedicated to the braking means, the number of parts increases by that amount, and it is difficult to miniaturize the binding machine. In addition, an increase in the number of parts also causes an increase in cost. On the other hand, since the technique described in Patent Document 2 uses a torsion motor as a drive source for the braking means, an increase in the number of parts is suppressed, but a load is applied when the braking means is operated or stopped. Fluctuations occur, and this load fluctuation may adversely affect the twisting operation of the twisting motor.

The present invention has been made to solve such a problem, and to provide a binding machine capable of suppressing an increase in the number of parts and braking a wire reel without adversely affecting a twisting operation. The purpose.

In order to solve the above-mentioned problems, the present invention rotatably accommodates a wire reel in which a wire is wound around a binding object and the wire is twisted to bind the binding object in a binding machine. An accommodating portion, a wire feeding portion that feeds a wire wound around the wire reel, a driving portion that drives the wire feeding portion, and a braking portion that operates by the driving force of the driving unit and regulates the rotation of the wire reel. The drive unit has a motor for feeding a wire, and the braking unit hits one of a pair of flange portions provided on both ends in the axial direction of a hub portion around which a wire is wound in the wire reel. The reel braking portion has a reel braking portion that regulates the rotation of the wire reel by contacting the wire reel, and a driving force transmission portion that is directly or indirectly connected to the motor and one end side rotates with the rotation of the motor. The drive is arranged between the wire reel and the driving force transmitting portion, and at least a part thereof is arranged on a rotation locus on one end side of the driving force transmitting portion, and when the driving force transmitting portion rotates by a predetermined angle, the driving is performed. The binding machine is configured to come into contact with one end side of the force transmitting portion and be pushed outward from the rotation locus on one end side of the driving force transmitting portion to come into contact with the flange portion .

In the present invention, since the braking portion is operated by using the driving portion for driving the wire feeding portion, the number of parts is hardly increased. Further, since the drive unit is for feeding the wire, it does not adversely affect the twisting operation.

It is a block diagram seen from the side which shows an example of the braking part provided in the reinforcing bar binding machine of this embodiment. It is a block diagram seen from the upper surface which shows an example of the braking part provided in the reinforcing bar binding machine of this embodiment. It is a block diagram seen from one side which shows an example of the whole structure of the reinforcing bar binding machine of this embodiment. It is a block diagram seen from the other side which shows an example of the whole structure of the reinforcing bar binding machine of this embodiment. It is a block diagram which shows an example of a clutch part. It is operation explanatory drawing which shows the operation of the braking part of this embodiment. It is operation explanatory drawing which shows the operation of the braking part of this embodiment. It is operation explanatory drawing which shows the operation of the braking part of this embodiment. It is operation explanatory drawing which shows the operation of the braking part of this embodiment. It is a block diagram seen from the side which shows the deformation example of the braking part provided in the reinforcing bar binding machine of this embodiment. It is an operation explanatory view seen from the upper surface which shows the deformation example of the braking part provided in the reinforcing bar binding machine of this embodiment. It is an operation explanatory view seen from the upper surface which shows the deformation example of the braking part provided in the reinforcing bar binding machine of this embodiment.

Hereinafter, an example of a reinforcing bar binding machine as an embodiment of the binding machine of the present invention will be described with reference to the drawings.

<Structure example of the reinforcing bar binding machine of the present embodiment>
FIG. 1 is a configuration diagram viewed from the side showing an example of a braking unit provided in the reinforcing bar binding machine of the present embodiment, and FIG. 2 is an upper surface showing an example of a braking unit provided in the reinforcing bar binding machine of the present embodiment. It is a block diagram seen from. Further, FIG. 3 is a configuration diagram viewed from one side showing an example of the overall configuration of the reinforcing bar binding machine of the present embodiment, and FIG. 4 shows an example of the overall configuration of the reinforcing bar binding machine of the present embodiment. It is a block diagram seen from the side of.

First, the outline of the reinforcing bar binding machine 1A of the present embodiment will be described with reference to FIGS. 3 and 4. In the following description, the side where the handle portion 10a is provided is the lower side with respect to the binding machine main body 10 of the reinforcing bar binding machine 1A, and the side opposite to the handle portion 10a is the upper side.

The reinforcing bar binding machine 1A has an accommodating portion 2A for rotatably accommodating a wire reel 20 wound with one or a plurality of wires, and a wire for sending a wire W wound around the wire reel 20 accommodated in the accommodating portion 2A. A feed unit 3A is provided. Further, the reinforcing bar binding machine 1A includes a curl forming portion 4A that curls the wire W sent by the wire feeding portion 3A and winds it around the reinforcing bar S. The curl forming portion 4A constitutes a path that regulates the traveling direction of the wire W so that the wire W is curled. The reinforcing bar binding machine 1A includes a binding portion 5A for twisting the wire W wound around the reinforcing bar S, and a braking portion 6A for restricting the rotation of the wire reel 20.

The reinforcing bar binding machine 1A feeds the wire W wound around the wire reel 20 by the wire feeding portion 3A, and winds the wire W around the reinforcing bar S while bending (curling) at the curl forming portion 4A.

The reinforcing bar binding machine 1A winds the wire W around the reinforcing bar S, and then grips and twists the wire W with the binding portion 5A. As a result, the reinforcing bars S are bound by the wires W. The reinforcing bar binding machine 1A regulates (brakes) the rotation of the wire reel 20 by the braking unit 6A after the wire W feeding operation by the wire feeding unit 3A is completed.

The wire reel 20 used in the reinforcing bar binding machine 1A will be described with reference to FIGS. 1 and 2. The wire reel 20 includes a tubular hub portion 20a around which the wire W is wound, and a pair of flange portions 20b provided on both ends in the axial direction of the hub portion 20a. The flange portion 20b has a diameter larger than the diameter of the hub portion 20a, and projects radially from both ends in the axial direction of the hub portion 20a.

A plurality of engaging portions 20c and protruding portions 20d are alternately formed on the outer periphery of one of the flange portions 20b in a substantially saw blade shape along the circumferential direction. The wire reel 20 is adapted to stop rotating when the reel braking portion 60 of the braking portion 6A, which will be described later, is engaged with the engaging portion 20c. The engaging portion 20c and the protruding portion 20d may have a shape that allows the reel braking portion 60 to engage, such as an uneven shape, and are not necessarily limited to a saw blade shape.

Next, the accommodating portion 2A accommodating the wire reel 20 will be described. The accommodating portion 2A is composed of a recess 22 formed in (the outer wall of) the binding machine main body 10 and a reel support portion 21 provided so as to be openable and closable with respect to the recess 22. A space for accommodating the wire reel 20 is formed. The recess 22 is provided with a support shaft 10b that projects from the wall surface of the recess 22 and rotatably supports the wire reel 20. The support shaft 10b is arranged so that it can be inserted into a hole (not shown) formed on one end side in the axial direction of the hub portion 20a when the wire reel 20 is accommodated.

The reel support portion 21 opens and closes with the shaft 21a provided on the binding machine main body 10 as a fulcrum. The reel support portion 21 has a support shaft 21b that supports the wire reel 20 at a position opposite to the support shaft 10b. The support shaft 21b is configured to protrude from the reel support portion 21 and be inserted into the hole portion 20e formed on the other end side in the axial direction of the hub portion 20a when the reel support portion 21 is closed.

When accommodating the wire reel 20 in the accommodating portion 2A, the reel support portion 21 is opened, the wire reel 20 is set on the support shaft 10b, and then the reel support portion 21 is closed. By closing the reel support portion 21, the support shaft 21b is inserted into the hole portion 20e of the wire reel 20, and the wire reel 20 is rotatably supported by the support shaft 10b and the support shaft 21b. When the wire reel 20 is taken out from the accommodating portion 2A, the reel support portion 21 is opened again and the wire reel 20 is removed from the support shaft 10b. In the present embodiment, the accommodating portion 2A is provided in the binding machine main body 10, but it may be provided separately from the binding machine main body 10 (at a position away from the binding machine main body 10).

Next, the wire feeding unit 3A for feeding the wire W will be described. The wire feed unit 3A includes a first feed gear 30L and a second feed gear 30R as a pair of feed members. In the first feed gear 30L and the second feed gear 30R, a groove portion 31 into which the wire W enters along the circumferential direction is formed on the outer peripheral surface of the disk-shaped member, and a portion where the groove portion 31 is formed is formed. Except for, the gear has a substantially spur gear shape in which a tooth portion (not shown) is formed on the outer peripheral surface.

The first feed gear 30L and the second feed gear 30R are arranged so as to sandwich the feed path of the wire W so that the outer peripheral surfaces face each other. Further, the first feed gear 30L and the second feed gear 30R are urged in a relatively close direction by an urging means such as a spring (not shown).

The wire feed portion 3A is configured such that the tooth portions of the first feed gear 30L and the second feed gear 30R are engaged with each other and the driving force is transmitted from one feed gear to the other feed gear. In this example, the driving force is transmitted from the first feed gear 30L to the second feed gear 30R.

The wire feed portion 3A is in a state where the wire W enters the groove portion 31 of the first feed gear 30L and the second feed gear 30R and is sandwiched between the first feed gear 30L and the second feed gear 30R. , The wire W can be fed by rotating the first feed gear 30L and the second feed gear 30R. The wire feeding portion 3A feeds the wire W toward the curl forming portion 4A. The first feed gear 30L and the second feed gear 30R are not necessarily limited to spur gears as long as they can transmit a driving force from one feed gear to the other feed gear.

Next, the drive unit that drives the first feed gear 30L and the second feed gear 30R by the wire feed unit 3A will be described. The drive unit includes a feed motor (motor) 32 that drives the first feed gear 30L. The output shaft 32b of the feed motor 32 is connected to the first feed gear 30L via the gear 32a, the gear 34, and the rotary shaft 33.

When the feed motor 32 (output shaft 32b) rotates, the driving force of the feed motor 32 is transmitted to the first feed gear 30L via the gear 32a, the gear 34, and the rotation shaft 33. When the first feed gear 30L rotates, the second feed gear 30R that meshes with the first feed gear 30L also rotates.

In the reinforcing bar binding machine 1A, the feed amount of the wire W is detected by using the rotation speed of the first feed gear 30L. In this example, since a magnetic sensor is used to detect the rotation speed, a permanent magnet (not shown) is embedded in the gear 33 coaxial with the first feed gear 30L. Therefore, the gear 33 is made of a non-magnetic resin. On the other hand, in order to transmit the driving force from the first feed gear 30L to the second feed gear 30R, the first feed gear 30L and the second feed gear 30R are made of iron to ensure strength.

Next, the curl forming portion 4A around which the wire W is wound around the reinforcing bar S will be described with reference to FIGS. 3 and 4. The curl forming portion 4A abuts on the wire W fed by the wire feeding portion 3A and regulates the traveling direction of the wire W. The curl forming portion 4A guides the wire W to curl the wire W so that the wire W draws a substantially circle around the reinforcing bar S (so as to curl along the circumference of the reinforcing bar S).

Next, the binding portion 5A for twisting the wire W to bind the reinforcing bars S will be described. The binding portion 5A includes a twisting motor 51, a gear 52, a screw shaft portion 53, an advancing / retreating cylinder portion 54, and a twisting hook 55. As the drive source of the binding portion 5A, a torsion motor 51 that is driven separately from the feed motor 32 is used.

The screw shaft portion 53 is rotatably supported with respect to the binding machine main body 10, and is rotated by the driving force of the twisting motor 51 transmitted via the gear 52. A screw is formed on the outer peripheral surface of the screw shaft portion 53, and a screw is formed on the inner peripheral surface of the advancing / retreating cylinder portion 54, so that the screw on the outer peripheral surface of the screw shaft portion 53 is formed on the inner peripheral surface of the advancing / retreating cylinder portion 54. It is screwed into the screw.

The binding portion 5A is configured such that the advancing / retreating cylinder portion 54 moves back and forth by rotating the screw shaft portion 53 due to the rotation of the torsion motor 51 in a state where the rotation of the advancing / retreating cylinder portion 54 is restricted. .. Further, by connecting the screw shaft portion 53 and the advance / retreat cylinder portion 54 so as to rotate integrally, the advance / retreat cylinder portion 54 is configured to rotate by the rotation of the screw shaft portion 53 due to the rotation of the torsion motor 51. Will be done.

The twisting hook 55 is a pair of claw-shaped members attached to the tip of the advancing / retreating cylinder portion 54. The twisting hook 55 is configured to open and close according to the advancing / retreating operation of the advancing / retreating cylinder portion 54 by a known structure.

The binding portion 5A operates as follows. First, when the trigger 10c of the reinforcing bar binding machine 1A is operated, the wire W is fed by the wire feeding portion 3A by a predetermined amount, and is wound around the reinforcing bar S by the curl forming portion 4A. The number of times the wire W is wound around the reinforcing bar S is set according to the feed amount of the wire W.

After that, the torsion motor 51 rotates in the normal direction, and the rotation of the torsion motor 51 is transmitted to the screw shaft portion 53 via the gear 52. At this time, the screw shaft portion 53 rotates, but since the rotation of the advancing / retreating cylinder portion 54 is restricted, the advancing / retreating cylinder portion 54 is sent forward by the action of the screwed screw. When the advancing / retreating cylinder portion 54 is fed forward, the twisting hook 55 advances to a position where it comes into contact with the wire W. The twisting hook 55 operates in the closing direction in conjunction with the advancement of the advancing / retreating cylinder portion 54, and grips a part of the wire wound in a loop shape.

The advancing / retreating cylinder portion 54 is released from the rotation restriction at a predetermined position where it has advanced, and rotates together with the screw shaft portion 53. The wire W is twisted by rotating the twisting hook 55 that holds the wire W. While the advancing / retreating cylinder portion 54 is advancing, a cutter (not shown) operates to cut the wire W.

When the twisting operation is completed, the twisting motor 51 reverses, and the screw shaft portion 53 rotates in the opposite direction. As a result, the advancing / retreating cylinder portion 54 and the twisting hook 55 also move rearward, and the twisting hook 55 opens to release the wire W. The twisting motor 51 reverses until the advancing / retreating cylinder portion 54 and the twisting hook 55 move to the standby position. When the advancing / retreating cylinder portion 54 and the twisting hook 55 move to the standby position, the twisting motor 51 stops and a series of operations is completed.

Next, the details of the braking unit 6A will be described with reference to FIGS. 1 and 2. The braking unit 6A includes a reel braking unit 60 that engages with the wire reel 20 and a driving force transmission unit 61 that transmits the driving force of the feed motor 32 to the reel braking unit 60. The braking unit 6A is driven by the feed motor 32.

The reel braking portion 60 includes a claw portion 60a that engages with the engaging portion 20c of the wire reel 20 at one end portion on one end side. Further, in the reel braking portion 60, the other end portion on the other end side is rotatably supported by the support shaft portion 10d provided on the binding machine main body 10. The claw portion 60a has a shape that protrudes toward the flange portion 20b on the side where the engaging portion 20c of the wire reel 20 is provided. The reel braking portion 60 includes a pressed portion 60c that is pushed (contacted) by the driving force transmitting portion 61 between one end and the other end.

The driving force transmitting portion 61 has a long shape, and has an operating portion 61a for pushing the pressed portion 60c to move the reel braking portion 60 at one end on one end side, and the other end on the other end side. The end portion is connected to the rotary shaft 33 via the clutch portion 62.

The reel braking unit 60 is arranged between the wire reel 20 housed in the housing unit 2A and the driving force transmission unit 61. The reel braking portion 60 is arranged so that a part (pressed portion 60c) is located on the rotation locus of the operating portion 61a due to the rotation of the driving force transmitting portion 61 with the rotating shaft 33 as a fulcrum. Therefore, when the driving force transmitting unit 61 rotates by a predetermined angle in the arrow r direction (see FIG. 9), the reel braking unit 60 comes into contact with the operating unit 61a and is pushed outward from the rotation locus of the operating unit 61a. When the reel braking portion 60 is pushed by the operating portion 61a, the reel braking portion 60 rotates in the direction of arrow ra (see FIG. 8) with the support shaft portion 10d as a fulcrum, and the claw portion 60a engages with the engaging portion 20c of the wire reel 20. ..

The reel braking portion 60 is urged by a urging means (not shown) such as a torsion coil spring or a leaf spring in a direction in which the claw portion 60a is separated from the flange portion 20b. Therefore, when the driving force transmitting portion 61 rotates in the direction of the arrow f and the contact with the operating portion 61a is released, the reel braking means 60 moves in the direction of the arrow fa with the support shaft portion 10d as a fulcrum (see FIG. 6). As it rotates, the claw portion 60a separates from the engaging portion 20c of the wire reel 20.

The actuating portion 61a has a shape such that when the driving force transmitting portion 61 rotates in the direction of the arrow r with the rotation shaft 33 as a fulcrum, the pressed portion 60c is gradually pushed while being in sliding contact with the pressed portion 60c of the reel braking portion 60. It consists of slopes.

At a position separated from the driving force transmitting unit 61 in the arrow f direction by a predetermined distance, a first stopper 63a that regulates the rotation range of the driving force transmitting unit 61 in the arrow f direction is provided. Further, at a position separated from the driving force transmitting unit 61 in the arrow r direction by a predetermined distance, a second stopper 63b that regulates the rotation range of the driving force transmitting unit 61 in the arrow r direction is provided.

The first stopper 63a is provided at a position where the driving force transmitting unit 61 comes into contact with the driving force transmitting unit 61 by rotating the driving force transmitting unit 61 with the rotation shaft 33 as a fulcrum in the direction of the arrow f, and the driving force transmitting unit 63a is attached to the first stopper 63a. When the 61 comes into contact, the rotation of the driving force transmission unit 61 is restricted. The second stopper 63b is provided at a position where the driving force transmitting unit 61 comes into contact with the second stopper 63b due to the rotation of the driving force transmitting unit 61 with the rotation shaft 33 as a fulcrum in the direction of the arrow r. When the 61 comes into contact, the rotation of the power transmission member 61 is restricted.

Therefore, in this example, when the driving force transmitting portion 61 rotates in the arrow f direction to a position where it contacts the first stopper 63a, the reel braking portion 60 rotates in the arrow fa direction with the support shaft portion 10d as a fulcrum, and the claw portion 60a. Is separated from the engaging portion 20c of the wire reel 20. Further, when the driving force transmitting portion 61 rotates in the arrow r direction to a position where it contacts the second stopper 63b, the reel braking portion 60 rotates in the arrow ra direction with the support shaft portion 10d as a fulcrum, and the claw portion 60a becomes a wire reel. Engage with the engaging portion 20c of 20.

FIG. 5 is a configuration diagram showing an example of the clutch portion. The clutch portion 62 is for transmitting the driving force from the gear 34 to the driving force transmitting portion 61 or for interrupting the driving force. The clutch portion 62 has a ball 62a for transmitting a driving force from the gear 34 to the driving force transmitting portion 61, and a spring 62b for pressing the ball 62a against the driving force transmitting portion 61. The spring 62b is inserted into the hole portion 34a of the gear 34 provided on the surface of the gear 34 facing the driving force transmitting portion 61. Further, the ball 62a is inserted into the engaging hole portion 62c provided in the driving force transmission portion 61.

The engaging hole portion 62c is formed with a recess having a shape in which a part of the ball 62a is inserted on the surface of the driving force transmitting portion 61 facing the gear 34. The engaging hole portion 62c is provided at at least one position in accordance with the locus of the ball 62a due to the rotation of the gear 34.

The driving force transmitting portion 61 is pressed by the spring 62b and the ball 62a enters the engaging hole portion 62c, so that the driving force transmitting portion 61 rotates in conjunction with the rotation of the gear 34. When the driving force transmitting unit 61 comes into contact with the first stopper 63a or the second stopper 63b shown in FIG. 2 and a predetermined load is applied to the driving force transmitting unit 61, the ball 62b compresses the spring 62b and the ball 62b enters the hole 34a. The ball 62a enters and disengages from the engaging hole portion 62c of the driving force transmission portion 61. As a result, the transmission of the driving force from the gear 34 to the driving force transmitting unit 61 is cut off, and the rotation of the driving force transmitting unit 61 is restricted while the gear 34 is rotating.

<Operation example of the braking unit of the present embodiment>
6 to 9 are operation explanatory views showing the operation of the braking unit of the present implementation. In the operation of feeding the wire W by the first feed gear 30L and the second feed gear 30R, as shown in FIG. 7, the feed motor 32 is rotated in the direction indicated by the arrow f1 (positive direction, first direction). As a result, the gear 34 and the first feed gear 30L rotate in the direction of the arrow f2.

When the driving force of the feed motor 32 is transmitted from the gear 34 to the driving force transmission unit 61 by rotating the gear 34 in the direction of the arrow f2, the driving force transmission unit 61 rotates in the direction of the arrow f2. When the driving force transmitting unit 61 rotating in the direction of the arrow f comes into contact with the first stopper 63a, the transmission of the driving force from the gear 34 to the driving force transmitting unit 61 is cut off by the action of the clutch unit 62 described above.

When the driving force transmitting portion 61 rotates in the direction of the arrow f to a position where it contacts the first stopper 63a, the reel braking portion 60 rotates in the direction of the arrow fa with the support shaft portion 10d as a fulcrum, as shown in FIG. The 60a separates from the engaging portion 20c of the wire reel 20. As a result, the braking of the wire reel 20 is released, the wire reel 20 can be rotated, and the wire W can be fed by the first feed gear 30L and the second feed gear 30R.

The amount of rotation of the driving force transmitting unit 61 for separating the claw portion 60a of the reel braking portion 60 from the engaging portion 20c of the wire reel 20 is the amount of rotation of the first feed gear 30L for feeding the wire W by a predetermined amount. There are few. Therefore, by the action of the clutch unit 62, the driving force transmitted from the feed motor 32 to the driving force transmission unit 61 is cut off at a predetermined timing.

As a result, even if the reel braking unit 60 is operated by the feed motor 32, the rotation of the first feed gear 30L and the second feed gear 30R is not hindered, and the wire W can be fed by a predetermined amount.

In the operation of stopping the feed of the wire W, after stopping the rotation of the feed motor 32 in the arrow f1 direction, as shown in FIG. 9, the feed motor 32 is moved in the opposite direction (second direction) indicated by the arrow r1. Rotate by a predetermined angle (predetermined amount). When the feed motor 32 is rotated in the direction of arrow r1, the gear 34 and the first feed gear 30L are rotated in the direction of arrow r2.

When the gear 34 rotates in the direction of arrow r2 and the driving force of the feed motor 32 is transmitted from the gear 34 to the driving force transmitting unit 61, the driving force transmitting unit 61 rotates in the direction of arrow r2. When the driving force transmitting unit 61 rotating in the r direction of the arrow comes into contact with the second stopper 63b, the transmission of the driving force from the gear 34 to the driving force transmitting unit 61 is cut off by the action of the clutch unit 62 described above.

When the driving force transmitting portion 61 rotates in the arrow r direction to a position where it contacts the second stopper 63b, the operating portion 61a of the driving force transmitting portion 61 slides in contact with the pressed portion 60c of the reel braking portion 60, and the reel braking portion 60 Is pushed in the direction of the wire reel 20. As shown in FIG. 8, the reel braking portion 60 pushed by the operating portion 61a rotates in the direction of arrow ra with the support shaft portion 10d as a fulcrum, and the claw portion 60a engages with the engaging portion 20c of the wire reel 20. .. As a result, the rotation of the wire reel 20 is restricted. Therefore, after the rotation of the feed motor 32 is stopped, the wire reel 20 rotates due to inertia, so that the wire W is prevented from loosening.

In the reinforcing bar binding machine 1A, in the operation of twisting the wire W at the binding portion 5A, as the number of times the wire W is twisted increases, the load applied to the twisting motor 51 increases. Therefore, the load fluctuation of the twisting motor 51 is detected by increasing or decreasing the current flowing through the twisting motor 51, and the timing of ending the operation of twisting the wire W is controlled.

Therefore, in the conventional reinforcing bar binding machine that operates the braking member that regulates the rotation of the wire reel 20 by the driving force of the torsion motor 51, the wire W is caused by the load fluctuation of the torsion motor 51 due to the operation of the braking member. There is a possibility of erroneously detecting the timing to end the twisting operation.

On the other hand, in the reinforcing bar binding machine 1A of the present embodiment, since the feed motor 32 is used instead of the twisting motor 51 to operate the reel braking unit 60, the operation of braking the wire reel 20 is the operation of twisting the wire W. Does not affect.

The reel braking unit 60 operates by stopping the feed motor 32 that feeds the wire W and then rotating the feed motor 32 in the opposite direction by a predetermined amount to regulate the rotation of the wire reel 20. In this way, the timing at which the feed of the wire W is stopped can be controlled by the feed motor 32, and the timing at which the reel braking unit 60 is operated can also be controlled by the same feed motor 32. Thereby, the timing of stopping the feeding of the wire W and the timing of restricting the rotation of the wire reel 20 can be matched.

Further, the braking unit 6A only transmits the driving force of the feed motor 32 to the reel braking unit 60 via the driving force transmission unit 61, and transmits the driving force of the feed motor 32 to the reel braking unit 60. For example, since it is not necessary to use a complicated link mechanism, the structure is simple and the assembling property is good. Further, in the configuration in which the driving force is transmitted by the link, the dimensional error of the distance between the shafts affects the operation, but in the braking unit 6A, the operating unit 61a of the driving force transmitting unit 61 is in sliding contact with the reel braking unit 60. Since it is configured, it is less susceptible to dimensional errors of parts.

<Modification example of the reinforcing bar binding machine of the present embodiment>
FIG. 10 is a configuration diagram viewed from the side showing a modified example of the braking portion provided in the reinforcing bar binding machine of the present embodiment, and FIGS. 11 and 12 show the braking portion provided in the reinforcing bar binding machine of the present embodiment. It is operation explanatory drawing seen from the upper surface which shows the modification.

In the braking unit 6A of the above-described embodiment, the driving force of the feed motor 32A is transmitted to the reel braking unit 60 via the driving force transmission unit 61. On the other hand, the braking portion 6B of the modified example has a configuration in which the driving force of the feed motor 32A is directly transmitted to the reel braking portion by forming the reel braking portion and the driving force transmitting portion with one component.

That is, the braking portion 6B includes a reel braking portion 60B that engages with the wire reel 20. The reel braking portion 60B is provided with a claw portion 60a that engages with the engaging portion 20c of the wire reel 20 at one end portion on one end side. Further, in the reel braking portion 60B, the other end portion on the other end side is connected to the rotating shaft 33 via the clutch portion 62.

The reel braking unit 60B rotates around the rotation shaft 33 as a fulcrum. The reel braking portion 60B extends so that the rotation locus of the claw portion 60a due to rotation about the rotation shaft 33 as a fulcrum intersects the outer periphery of one flange portion 20b of the wire reel 20 housed in the accommodating portion 2A.

As described above, the rotary shaft 33 is attached to the gear 34 that meshes with the gear 32a of the feed motor 32. The clutch portion 62 has, for example, the same configuration as shown in FIG. 5, and transmits and shuts off the driving force from the feed motor 32 to the reel braking portion 60B depending on the load applied to the reel braking portion 60B.

As shown in FIG. 11, the reel braking portion 60B is moved from a position where the claw portion 60a is away from the engaging portion 20c of the wire reel 20 in the direction of arrow r with the rotation shaft 33 as a fulcrum, as shown in FIG. By rotation, the claw portion 60a engages with the engaging portion 20c of the wire reel 20. Further, as shown in FIG. 12, the claw portion 60a is rotated from the position where the claw portion 60a is engaged with the engaging portion 20c of the wire reel 20 in the direction of the arrow f with the rotation shaft 33 as a fulcrum, as shown in FIG. The claw portion 60a separates from the engaging portion 20c of the wire reel 20.

The braking unit 6B includes a first stopper 63a that regulates the rotation range of the reel braking unit 60B in the arrow f direction, and a second stopper 63b that regulates the rotation range of the reel braking unit 60B in the arrow r direction.

Explaining the operation of the braking unit 6B, in the operation of feeding the wire W by the first feed gear 30L and the second feed gear 30R, as shown in FIG. 11, the feed motor 32 is moved in the direction indicated by the arrow f1 (positive direction, Rotate in the first direction). As a result, the gear 34 and the first feed gear 30L rotate in the direction of the arrow f2.

When the gear 34 rotates in the arrow f2 direction and the driving force of the feed motor 32 is transmitted from the gear 34 to the reel braking portion 60B via the clutch portion 62, the reel braking portion 60B rotates in the arrow f direction. When the reel braking portion 60B rotating in the direction of the arrow f comes into contact with the first stopper 63a, the transmission of the driving force from the gear 34 to the reel braking portion 60B is cut off by the action of the clutch portion 62 described above.

When the reel braking portion 60B rotates in the direction of the arrow f to a position where it contacts the first stopper 63a, the claw portion 60a separates from the engaging portion 20c of the wire reel 20. As a result, the braking of the wire reel 20 is released, the wire reel 20 can be rotated, and the wire W can be fed by the first feed gear 30L and the second feed gear 30R.

The amount of rotation of the reel braking portion 60B for separating the claw portion 60a of the reel braking portion 60B from the engaging portion 20c of the wire reel 20 is the amount of rotation of the first feed gear 30L for feeding the wire W by a predetermined amount. few. Therefore, by the action of the clutch portion 62, the driving force transmitted from the feed motor 32 to the reel braking portion 60B is cut off at a predetermined timing.

As a result, even if the reel braking portion 60B is operated by the feed motor 32, the rotation of the first feed gear 30L and the second feed gear 30R is not hindered, and the wire W can be fed by a predetermined amount.

In the operation of stopping the feed of the wire W, after stopping the rotation of the feed motor 32 in the arrow f1 direction, as shown in FIG. 12, the feed motor 32 is moved in the opposite direction (second direction) indicated by the arrow r1. Rotate by a predetermined angle (predetermined amount). When the feed motor 32 is rotated in the direction of arrow r1, the gear 34 and the first feed gear 30L are rotated in the direction of arrow r2.

When the gear 34 rotates in the direction of arrow r2 and the driving force of the feed motor 32 is transmitted from the gear 34 to the reel braking portion 60B via the clutch portion 62, the reel braking portion 60B rotates in the direction of arrow r2. When the reel braking portion B rotating in the r direction of the arrow comes into contact with the second stopper 63b, the transmission of the driving force from the gear 34 to the reel braking portion 60B is cut off by the action of the clutch portion 62 described above.

When the reel braking portion 60B rotates in the arrow r direction to a position where it contacts the second stopper 63b, the claw portion 60a engages with the engaging portion 20c of the wire reel 20. As a result, the rotation of the wire reel 20 is restricted. Therefore, after the rotation of the feed motor 32 is stopped, the wire reel 20 rotates due to inertia, so that the wire W is prevented from loosening.

The braking portion 6B does not require a member for transmitting a driving force to the reel braking portion 60B, has a simple structure, and has good assembling property.

In each of the above-described embodiments, the rotation of the feed motor 32 that feeds the wire W in the forward direction separates the claws 60a of the reel braking portions 60 and 60B from the engaging portion 20c of the wire reel 20 and brakes the wire reel 20. Is released. On the other hand, when the feed motor 32 rotates in the opposite direction, the claws 60a of the reel braking portions 60 and 60B engage with the engaging portion 20c of the wire reel 20, and the wire reel 20 is braked. In this way, by switching the rotation direction of the feed motor 32, the restriction on the rotation of the wire reel 20 is released and the rotation is restricted.

On the other hand, in the embodiment described with reference to FIGS. 1 to 9, the driving force transmitting unit 61 is urged in the direction of the arrow r by an urging means such as a spring (not shown) to stop the rotation of the feed motor 32. In this state, the reel braking portion 60 may be engaged with the engaging portion 20c of the wire reel 20 via the driving force transmitting portion 61 by an urging force. In this case, if the feed motor 32 is rotated in the forward direction, the driving force transmitting unit 61 rotates in the direction of the arrow f against the urging force, so that the braking of the wire reel 20 is released. Similarly, in the embodiment of the modified example described with reference to FIGS. 10 to 12, the reel braking portion 60B is urged in the direction of the arrow r by an urging means such as a spring (not shown), and the rotation of the feed motor 32 is stopped. In this state, the reel braking portion 60B may be engaged with the engaging portion 20c of the wire reel 20 by an urging force. In this case, if the feed motor 32 is rotated in the forward direction, the reel braking portion 60B rotates in the direction of the arrow f against the urging force, so that the braking of the wire reel 20 is released.

Further, in each of the above-described embodiments, as the clutch portion 62, the ball 62a and the spring 62b are used to transmit and cut off the driving force from the gear 34 to the driving force transmitting portion 61 or the reel braking portion 60B. Other configurations using the above may be used.

Further, in each of the above-described embodiments, a rack member that meshes with the gear 34 and slides is provided, and the rack member is provided with the driving force transmission unit 61 or the reel braking unit 60B to drive the rotational motion of the feed motor 32. The reel braking unit 60 may be operated by converting the transmission unit 61 and the reel braking unit 60B into linear motion.

Further, the wire reel 20 has a configuration in which a plurality of engaging portions 20c and protruding portions 20d are alternately formed on the outer periphery of the flange portion 20b in a substantially saw blade shape along the circumferential direction. , The outer circumference of the flange portion 20b in contact with the 60B may be left in a circular shape, for example, and braking may be performed by friction.

1A, 1B ... Reinforcing bar binding machine, 10 ... Bundling machine body, 10a ... Handle part, 10b ... Support shaft, 10c ... Trigger, 10d ... Support shaft part, 2A ... Accommodating part, 20 ... Wire reel, 20a ... Hub part, 20b ... Flange part, 20c ... Engaging part, 20d ... Protruding part, 20e ... Hole part, 21 ... Reel support part, 21a ... shaft, 21b ... support shaft, 3A ... wire feed part, 30L ... first feed gear, 30R ... second feed gear, 31 ... groove part , 32 ... Feed motor (drive unit, motor), 32a ... Gear, 33 ... Rotating shaft, 34 ... Gear, 34a ... Hole, 4A ... Curl forming part, 5A ...・ ・ Bundling part, 51 ・ ・ ・ Twisting motor, 52 ・ ・ ・ Gear, 53 ・ ・ ・ Screw shaft part, 54 ・ ・ ・ Advance / retreat cylinder part, 55 ・ ・ ・ Twisting hook, 6A, 6B ・... Braking part, 60, 60B ... Reel braking part, 60a ... Claw part, 60c ... Pressed part, 61 ... Driving force transmission part, 61a ... Acting part, 62 ... Clutch part, 62a ... ball, 62b ... spring, 62c ... engagement hole part, 63a ... first stopper part, 63b ... second stopper part, W ... wire

Claims (8)

In a binding machine that winds a wire around a binding object and twists the wire to bind the binding object.
A housing unit that rotatably accommodates a wire reel around which wires are wound,
A wire feeder that feeds the wire wound on the wire reel,
A drive unit that drives the wire feed unit and
It is provided with a braking unit that operates by the driving force of the driving unit and regulates the rotation of the wire reel.
The drive unit has a motor for feeding wires.
The braking portion includes a reel braking portion that regulates the rotation of the wire reel by contacting one of a pair of flange portions provided on both ends in the axial direction of the hub portion around which the wire is wound in the wire reel, and the motor. Directly or indirectly connected to, one end side has a driving force transmission unit that rotates with the rotation of the motor.
The reel braking portion is arranged between the wire reel and the driving force transmitting portion, and at least a part thereof is arranged on a rotation locus on one end side of the driving force transmitting portion, and the driving force transmitting portion is arranged. A binding machine configured to come into contact with one end side of the driving force transmitting portion when rotated by a predetermined angle, and to be pushed outward from the rotation locus on the one end side of the driving force transmitting portion to come into contact with the flange portion. The binding machine according to claim 1, wherein the braking unit regulates the rotation of the wire reel after the wire feeding operation by the wire feeding unit is completed. The binding machine according to claim 1 or 2, wherein the braking unit switches between regulation of rotation of the wire reel and release of regulation of rotation by switching the rotation direction of the motor. The wire feeding unit feeds the wire when the motor rotates in the first direction, and stops feeding the wire when the motor rotates in a second direction opposite to the first direction. With
The braking unit releases the restriction on the rotation of the wire reel when the motor rotates in the first direction, and restricts the rotation of the wire reel when the motor rotates in the second direction. The binding machine according to claim 3. The binding machine according to any one of claims 1 to 4, wherein the braking unit has a clutch unit that cuts off the transmission of the driving force of the motor. The braking portion has a reel braking portion that regulates the rotation of the wire reel by abutting on one of a pair of flange portions provided on both ends in the axial direction of the hub portion around which the wire is wound in the wire reel. The binding machine according to any one of 1 to 5. The driving force transmitting portion has an operating portion that presses the reel braking portion on one end side.
The binding machine according to any one of claims 1 to 6, wherein the operating portion presses the reel braking portion so as to be in sliding contact with the reel braking portion. The reel braking portion has a claw portion that engages with the flange portion on one end side.
The drive unit has a clutch unit that transmits or cuts off the drive force to the drive force transmission unit.
The binding machine according to claim 7, wherein the other end of the drive transmission unit is connected to the clutch unit.

Images