JP6870305B2 - 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.

The reinforcing bar binding machine described in Patent Document 1 has a braking portion that can be engaged with a saw blade-shaped engaging portion formed on the outer periphery of the flange portion of the wire reel, and engages the braking portion with the engaging portion. This is a configuration that stops the rotation of the wire reel. The braking portion rotates a stopper lever that engages with the flange portion of the wire reel, a shaft that is connected to the stopper lever on one end side and is connected to the solenoid that is the driving means via the connecting wheel and the link on the other end side, and the shaft. It is equipped with brackets and bearings that support it as much as possible.

Patent No. 5369846

In the conventional rebar binding machine, when the wire reel is stopped, the braking portion does not engage well with the saw blade-shaped engaging portion, and the timing of stopping the wire reel may be delayed. Further, in order to engage the braking portion with the engaging portion of the flange portion, in addition to the stopper lever and the solenoid, a connecting wheel, a link, a shaft, a bracket, a bearing and the like are required, which complicates the device.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a binding machine capable of reliably stopping a wire reel at a desired timing without complicating the apparatus.

In order to solve the above-mentioned problems, the present invention has an accommodating portion for rotatably accommodating a tubular wire reel around which a wire is wound, a feeding unit for feeding the wire wound around the wire reel, and a feeding unit for feeding the wire. A curl forming portion that curls the curled wire along the circumference of the bound object, a binding portion that twists the curled wire at the curled forming portion to bind the bound object, and one end side of the wire reel in the axial direction. The accommodating portion includes a braking portion that rotatably supports the wire reel, and the reel holder is in a state in which the wire reel is attached. Is configured to be movable along the axial direction of the wire reel, and the braking portion is a binding machine configured by the reel holder.

Further, in the present invention, an accommodating portion for rotatably accommodating a tubular wire reel around which a wire is wound, a feeding unit for feeding the wire wound around the wire reel, and a wire fed by the feeding unit are placed around a binding object. A curl forming portion that curls along the line, a binding portion that twists the curled wire at the curl forming portion to bind the bound object, and a wire reel housed in the accommodating portion are pressed from one end side in the axial direction. , A binding machine provided with a braking portion that brakes the rotation of the wire reel by pressing the other end side of the wire reel in the axial direction against the inner wall of the accommodating portion.

Further, in the present invention, an accommodating portion for rotatably accommodating a tubular wire reel around which a wire is wound, a feed portion for feeding the wire wound around the wire reel, and a wire fed by the feed portion are bound. Inserted into a curl forming portion that curls along the periphery of the wire, a binding portion that twists the curled wire at the curl forming portion to bind the bound object, and a recess formed along the axial direction of the wire reel. A braking portion configured to be displaceable between a first position that presses the inner surface of the recess and a second position that is not pressed against the inner surface, and the braking portion being the first position. The accommodating portion includes a drive unit that is displaced from the second position, the accommodating unit has a reel holder that rotatably supports the wire reel, and the reel holder is in a state where the wire reel is attached. The braking unit is a binding machine configured by the reel holder, which is configured to be movable along the axial direction of the wire reel.

In the present invention, the rotating wire reel is pressed from one end side in the axial direction to stop, or is pressed from one end side in the axial direction and the other end side in the axial direction is pressed against the inner wall of the accommodating portion to stop. Alternatively, since the braking portion is pressed against the inner surface of the recess formed along the axial direction of the wire reel to stop it, the wire reel can be reliably stopped by the frictional force at the time of pressing. Further, since the wire reel is simply pushed from one end side in the axial direction, the number of parts is small and the device is not complicated.

It is a block diagram which looked at the braking part of the reinforcing bar binding machine which concerns on 1st Embodiment from the upper surface. 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. A configuration diagram viewed from above showing an example of the main configuration of the reinforcing bar binding machine of the present 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 looked at the braking part of the reinforcing bar binding machine which concerns on 2nd Embodiment from the upper surface. It is a block diagram which looked at the braking part of the reinforcing bar binding machine which concerns on 3rd Embodiment from the upper surface. It is a block diagram which looked at the braking part of the reinforcing bar binding machine which concerns on 3rd Embodiment from the upper surface. It is a block diagram which looked at the braking part of the reinforcing bar binding machine which concerns on 3rd Embodiment from the upper surface. It is a block diagram which looked at the braking part of the reinforcing bar binding machine which concerns on 4th Embodiment from the upper surface. It is a block diagram which showed the braking part of the reinforcing bar binding machine which concerns on 3rd Embodiment in more detail. It is a block diagram which showed the braking part of the reinforcing bar binding machine which concerns on 3rd Embodiment in more detail. It is a block diagram seen from the upper surface which shows the structural example of the braking device of the reinforcing bar binding machine which concerns on 4th Embodiment. A block diagram showing an example of a braking device for a reinforcing bar binding machine according to a fifth embodiment, It is a block diagram which shows an example of a wire reel. It is a block diagram seen from the upper surface which shows an example of the braking part of another embodiment. It is a block diagram seen from the front which shows still another example of the braking part of another embodiment. It is a main part perspective view which shows still another example of the braking part of another 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 of a braking portion of the reinforcing bar binding machine according to the first embodiment as viewed from above. Further, FIG. 2 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. 3 shows an example of the main configuration of the reinforcing bar binding machine of the present embodiment. The configuration diagram viewed from the top surface, FIG. 4, is a configuration diagram viewed from another side showing an example of the overall configuration of the reinforcing bar binding machine of the present embodiment.

First, the outline of the reinforcing bar binding machine 1A of the present embodiment will be described with reference to FIGS. 2 to 4. In the following description, the side where the handle portion 10a is provided with respect to the binding machine main body 10 of the reinforcing bar binding machine 1A is the lower side, 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, and a binding portion 5A that twists the wire W wound around the reinforcing bar S. ..

In the reinforcing bar binding machine 1A, the wire W wound around the wire reel 20 is fed by the wire feeding portion 3A and wound around the reinforcing bar S while being bent (curled) by 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 1} shown in FIG. 1 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. 2 and 3. The wire reel 20 has a tubular hub portion 20a around which the wire W is wound and an axial direction of the hub portion 20a (axial direction of the hub portion 20a in the rotational operation of the wire reel 20; hereinafter, may be simply referred to as “axial direction”). It is provided with a pair of flange portions 20b provided on both end sides. The flange portion 20b is a substantially circular plate-shaped member having a diameter larger than the diameter of the hub portion 20a and extending radially in the radial direction from both ends in the axial direction of the hub portion 20a. A concave fitting hole 20m to be fitted in the reel holder 60M, which will be described later, is formed at one end of the hub portion 20a in the axial direction. Further, at the other end of the hub portion 20a in the axial direction, a concave hole portion 20e into which the support shaft 21b of the reel support portion 21 described later is inserted is formed.

Next, the accommodating portion 2A to which the wire reel 20 is attached 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 accommodating portion 2A includes a reel holder 60M for supporting the wire reel 20 on the wall surface of the recess 22 facing the reel supporting portion 21. The reel holder 60M is arranged so that it can be inserted into the fitting hole portion 20m of the hub portion 20a when accommodating the wire reel 20. The reel holder 60M is formed in a convex cylindrical shape according to the shape of the fitting hole portion 20m.

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 from a position opposite to the reel holder 60M. The support shaft 21b is configured to protrude from the reel support portion 21 and be inserted into the hole portion 20e of the hub portion 20a when the reel support portion 21 is closed. The support shaft 21b is formed in a convex cylindrical shape according to the shape of the hole 20e of the wire reel 20.

When accommodating the wire reel 20 in the accommodating portion 2A, the reel support portion 21 is opened, the fitting hole portion 20m of the wire reel 20 is fitted into the reel holder 60M, and the wire reel 20 is set in the wire reel 60M. , The reel support portion 21 is closed, and the reel support portion 21 is locked in the closed state by a lock mechanism (not shown). 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 reel holder 60M 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 reel holder 60M.

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, it is a substantially spur gear-shaped gear 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 a 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. 2 and 4. The curl forming portion 4A abuts on the wire W fed by the wire feeding portion 3A, regulates the traveling direction of the wire W, and constitutes a path for regulating the traveling direction of the wire W so that the wire W is curled. 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 by 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.

<Structure example of the braking unit of the first embodiment>
As shown in FIGS. 1A and 1B, the reinforcing bar binding machine 1A according to the first embodiment presses the wire reel 20 from one end side in the axial direction to rotate the wire reel 20. A braking unit 6A ₁ for braking is provided. In this example, the braking portion 6A ₁ presses the surface of the flange portion 20b, but more specifically, it presses the periphery of the fitting hole portion 20c (recess) slightly closer to the center of the surface of the flange portion 20b. .. Here, the "surface of the flange portion 20b" is a surface (hub portion) opposite to the surface (the surface facing inward in the axial direction of the hub portion 20a) facing the other flange portion 20b provided on the hub portion 20a. It means a surface facing outward in the axial direction of 20a). The surface of the flange portion 20b includes not only a flat portion but also a convex portion protruding by a rib or the like and a concave portion recessed by a fitting hole portion 20c or the like. That is, the surface of the flange portion 20b means the entire continuous surface regardless of the shape such as unevenness. Further, "pressing the surface of the flange portion 20b" means not only the case where the entire surface of the flange portion 20b is pressed but also the case where a part of the surface is pressed.

The braking portion 6A ₁ is provided so as to project from the recess 22 of the accommodating portion 2A, and is driven by a driving unit such as a solenoid (not shown) to move in the axial direction of the wire reel 20. _{The braking portion 6A 1} moved toward the wire reel 20 by the driving unit abuts on the surface of the _{flange portion 20b, and by further strengthening the contact, between the braking portion 6A 1} and the surface of the flange portion 20b. A frictional force equal to or higher than a predetermined value is generated in the wire reel 20, whereby the wire reel 20 stops rotating. In this example, the braking portion 6A ₁ is a tubular member arranged so as to surround the reel holder 60M shown in FIG. Therefore, the braking portion 6A ₁ moved toward the wire reel 20 presses the surface of the flange portion 20b (at its end) from the periphery of the reel holder 60M. The shape of the braking portion 6A ₁ is not limited to the tubular member, as long as the surface of the flange portion 20b can be pressed to stop the rotation of the wire reel 20. For example, the braking portion 6A ₁ may be one or a plurality of plate-shaped members, rod-shaped members, or the like arranged around the reel holder 60M.

<Example of action and effect of the braking unit of the first embodiment>
As shown in FIGS. 1A and 1B, the braking portion 6A ₁ is in contact with (pressed) a non-braking position where the end portion 69A ₁ is not in contact with the wire reel 20 and the wire reel 20. Move to and from the braking position. The braking unit 6A ₁ moves in the direction of arrow G2 due to the driving force of the driving unit, the urging force of the spring, or the like, and moves to the non-braking position shown in FIG. 1A. When the braking portion 6A ₁ is in the non-braking position, the end portion 69A _{1 of the braking portion 6A 1} is separated from the surface of the flange portion 20b. Therefore, when the braking portion 6A ₁ is in the non-braking position, the wire reel 20 is in a rotatable state due to the feeding of the wire W by the wire feeding portion 3A.

When the braking unit 6A ₁ is moved from the non-braking position to the braking position shown in FIG. 1 (b), the driving unit is driven to move the braking unit 6A ₁ from the non-braking position in the direction of the arrow G1. When the braking portion 6A ₁ moves to the braking position, the end portion 69A _{1 of the braking portion 6A 1} presses the surface of the flange portion 20b.

The end 69A ₁ of the braking portion 6A ₁ By pressing the surface of the flange portion 20b, the frictional force is generated between the end portion 69A ₁ and the surface of the flange portion 20b of the braking portion 6A _1, the frictional force is given When it exceeds the value, the rotation of the wire reel 20 is braked.

In this example, the braking unit 6A ₁ is driven by a driving unit (solenoid or the like) dedicated to the braking unit, but is driven by, for example, the feed motor 32 shown in FIG. 2 or the torsion motor 51 shown in FIG. Is also good.

<Structure example of the braking portion of the second embodiment> FIG. 5 is a configuration diagram of the braking portion of the reinforcing bar binding machine according to the second embodiment as viewed from above. As shown in FIGS. 5A and 5B, the reinforcing bar binding machine according to the second embodiment presses the wire reel 20 from one end side in the axial direction to brake the rotation of the wire reel 20. A braking unit 6A ₂ for making the brake is provided. Unlike the first embodiment, the braking portion 6A ₂ presses a portion of the surface of the flange portion 20b that is closer to the outer peripheral side in the radial direction than the periphery of the fitting hole portion 20c. In this example, the braking portion 6A ₂ presses two locations on the surface of the flange portion 20b. The braking portion 6A ₂ is provided so as to project from the recess 22 of the accommodating portion 2A, and is driven by a driving unit such as a solenoid (not shown) to move in the axial direction of the wire reel 20. _{The braking portion 6A 2} moved toward the wire reel 20 by the driving unit abuts on the surface of the _{flange portion 20b, and by further strengthening the contact, between the braking portion 6A 2} and the surface of the flange portion 20b. A frictional force equal to or higher than a predetermined value is generated in the wire reel 20, whereby the wire reel 20 stops rotating. In this example, the two rod-shaped braking portions 6A ₂ move toward the wire reel 20 and press the two surfaces of the flange portion 20b. The shape of the braking portion 6A ₂ is not limited to the rod-shaped member as long as the surface of the flange portion 20b can be pressed to stop the rotation of the wire reel 20. Further, the number of braking portions 6A ₂ may be one or three or more instead of two.

The braking unit 6A ₂ moves between the non-braking position shown in FIG. 5A and the braking position shown in FIG. 5B by the driving unit.

<Example of action and effect of the braking unit of the second embodiment>
The braking portion 6A ₂ is moved by moving the arrow G2 direction by the driving force of the drive unit to the non-braking position, an end portion 69A ₂ of the braking portion 6A _2, the surface 20b of the one flange portion 20b of the wire reel 20 Move away from _1. As a result, the wire reel 20 becomes rotatable by the feeding of the wire W by the wire feeding portion 3A.

On the other hand, the braking portion 6A ₂ is and move to the braking position and moved in the arrow G1 direction by the driving force of the driving portion, the end portion 69A ₂ of the braking portion 6A _2, the surface 20b of the one flange portion 20b of the wire reel 20 Press _1.

The end portion 69A ₂ of the braking portion 6A ₂ by pressing the surface 20b ₁ of the flange portion 20b, the frictional force between the surface 20b ₁ of the end portion 69A ₂ and the flange portion 20b of the braking portion 6A ₂ occurs, the frictional When the force exceeds a predetermined value, the rotation of the wire reel 20 is braked.

Further, the braking unit 6A ₂ may be driven by the feed motor 32 shown in FIG. 2 or the torsion motor 51 shown in FIG. 4 instead of the dedicated drive unit.

<Structure example of the braking unit of the third embodiment>
6, FIG. 7 and FIG. 8 are configuration views of the braking portion of the reinforcing bar binding machine according to the third embodiment as viewed from above. As shown in FIGS. 6 and 8, the reinforcing bar binding machine according to the third embodiment presses the wire reel 20 from one end side in the axial direction to brake the rotation of the wire reels 6A _3, 6A. ₅ is provided. The braking portions 6A _3, 6A _{5 are composed of reel holders 60A 3,} 6A ₅ that can move in the axial direction, and are configured to be able to press at least a part of the inner surface of the fitting hole portion 20c by movement. The braking portion _6A 3, 6A ₅ by pressing the inner surface of the fitting hole 20c, the rotation of the wire reel 20 by the frictional force generated between the inner surface of the braking portion _6A 3, 6A ₅ and fitting holes 20c It can be braked.

_{The braking portion 6A 3} shown in FIG. 6 is configured to be able to press the bottom surface 20h _{3 of the fitting hole portion 20c.} In this embodiment, the frictional force of a predetermined value or more between the tip portion 69a ₃ and the bottom surface 20h ₃ of the fitting hole portion 20c of the braking portion 6A ₃ presses the brake unit 6A ₃ on the bottom surface 20h ₃ of the fitting hole portion 20c Is generated so that the rotation of the wire reel 20 can be stopped. _{Further, the braking portion 6A 5} shown in FIG. 8 has a tapered shape (tapered shape) whose diameter decreases toward the tip, and the _{fitting hole portion 20c into which the braking portion 6A 5} is inserted also goes to the back of the hole. It has a tapered shape (tapered shape) with a smaller diameter. Then, according to the braking portion 6A ₅ is gradually inserted into the fitting hole portion 20c, the frictional force between the inner peripheral 20i ₅ of the outer circumference 69a ₅ and the fitting hole portion 20c of the braking portion 6A ₅ is increased gradually It is configured as follows. Therefore, when the braking portion 6A ₅ is inserted into the fitting hole portion 20c to a predetermined depth, the wire reel 20 is braked by the frictional force between the _{braking portion 6A 5 and the fitting hole portion 20c.} The braking unit 6A ₅ is driven by a driving unit such as a solenoid (not shown), and the non-braking position (FIGS. 6 (a) and 8 (a)) and the braking position (FIG. 6 (b) and 8 (b)). Moving between and is the same as in the case of the first and second embodiments.

_{The braking unit 6A 4} shown in FIG. 7 is _{also composed of the reel holder 60A 4} like the braking unit shown in FIGS. 6 and 8, but the braking unit 6A ₄ replaces the axial movement of the wire reel 20 or Along with the movement in the axial direction, it is possible to move in the lateral direction (arrow G3 direction) orthogonal to the axial direction. By moving the braking portion 6A ₄ in the lateral direction, the side surface 69a _{4 of the braking portion 6A 4} comes into contact with the side wall 20h _{4 of the fitting hole portion 20c.} Therefore, friction between the side surfaces 69a ₄ of the braking portion 6A ₄ By strongly pressing on the side wall 20h ₄ of the fitting hole portion 20c, the side surface 69a ₄ and the side wall 20h ₄ of the fitting hole portion 20c of the braking portion 6A ₄ The force can stop the rotation of the wire reel 20. The braking unit 6A ₄ is driven by a driving unit such as a solenoid (not shown).

The braking unit 60A ₄ moves between the non-braking position shown in FIG. 7A and the braking position shown in FIG. 7B by the driving unit.

Brake 6A ₄ is, when it moves in the arrow G4 direction by the driving unit to move to a non-braking position, the side surface 69a ₄ of the braking portion 6A ₄ moves away from the side wall 20h ₄ of the fitting hole portion 20c. As a result, the wire reel 20 becomes rotatable by the feeding of the wire W by the wire feeding portion 3A.

On the other hand, when the braking portion 6A ₄ is moved in the direction of the arrow G3 by the driving portion and moved to the braking position, the side surface 69a _{4 of the braking portion 6A 4} presses the side wall 20h ₄ of the fitting hole portion 20c.

The side 69a ₄ of the braking portion 6A ₄ by pressing the side wall 20h ₄ of the fitting hole portion 20c, the frictional force between the side wall 20h ₄ sides 69a ₄ and the fitting hole portion 20c of the braking portion 6A ₄ occurs, The rotation of the wire reel 20 is braked.

The braking unit 6A ₄ may be driven by the feed motor 32 shown in FIG. 2 or the torsion motor 51 shown in FIG. 4 instead of the dedicated drive unit.

<Structure example of the braking unit of the fourth embodiment>
FIG. 9 is a configuration diagram of the braking portion of the reinforcing bar binding machine according to the fourth embodiment as viewed from above. As shown in FIGS. 9A and 9B, the reinforcing bar binding machine according to the fourth embodiment presses the wire reel 20 from one end side in the axial direction to press the wire reel 20 from one end side in the axial direction to the other end side of the wire reel 20. Is provided with a _{braking portion 6A 6} for pressing the inner wall 200 of the storage portion 2A. In this example, the braking unit 6A ₆ is a reel holder that can move in the axial direction, and is driven by a driving unit (not shown) such as a solenoid. The braking portion 6A ₆ presses the wire reel 20 shown in FIG. 9A against the inner wall 200 of the accommodating portion 2A and the non-braking position in which the wire reel 20 shown in FIG. 9A is not pressed against the inner wall 200 of the accommodating portion 2A. Move to and from the braking position.

In the accommodating portion 2A, one end side of the wire reel 20 in the axial direction _{is supported by the reel holder (braking portion 6A 6} ), and the other end side is supported by the support shaft 201. As shown in FIG. 9C, the wire reel 20 is supported. A spring 21f is provided at the tip of the shaft 201, and the spring 21f allows the wire reel 20 to move in the axial direction. Therefore, when the wire reel 20 is pressed from one end side in the axial direction with a force equal to or higher than a predetermined value, the wire reel 20 moves toward the inner wall of the accommodating portion 2A. On the other hand, when the above-mentioned force applied to the wire reel 20 is released, the wire reel 20 returns to its original position by the force of the spring 21f. In the example of FIG. 9C, the spring 21f is provided at the tip of the support shaft 201 _{to press the bottom surface 20e 1} of the hole 20e of the wire reel 20, but the wire reel 20 is inside the accommodating portion 2A. The position where the spring 21f is provided is not limited to a specific place as long as it can be moved in the axial direction.

<Example of action and effect of the braking unit according to the fourth embodiment>
When the braking portion 6A ₆ is in the non-braking position shown in FIG. 9A, the wire reel 20 is pushed by the force of the spring 21f in the direction opposite to the inner wall 200 of the accommodating portion 2A. That is, when the braking portion 6A ₆ is in the non-braking position, the wire reel 20 (the other end portion 20a ₂ of the hub portion 20a) is separated from the inner wall 200 of the storage portion 2A. Therefore, when the braking portion 6A ₆ is in the non-braking position, the wire reel 20 is in a rotatable state due to the feeding of the wire W by the wire feeding portion 3A.

The braking unit 6A ₆ may be moved to the non-braking position (movement in the arrow G2 direction) by the driving force of the driving unit, and the braking unit 6A ₆ can freely move with the driving unit as non-driving. The state may be set so that the spring 21f pushes the wire reel 20.

When the braking unit 6A ₆ is moved from the non-braking position to the braking position, the driving unit is driven to move the braking unit 6A ₆ from the non-braking position in the direction of arrow G1. When the braking portion 6A ₆ moves to the braking position, the end portion 69A _{6 of the braking portion 6A 6} presses _one end portion 20a 1 of the hub portion 20a of the wire reel 20.

When the braking portion 6A ₆ presses the wire reel 20 in the axial direction, the wire reel 20 moves toward the inner wall 200 side of the accommodating portion 2A while compressing the spring 21f. _{When braking the wire reel 20, the braking portion 6A 6} is moved _{until the other end 20a 2} of the hub portion 20a of the wire reel 20 is pressed against the inner wall 200 of the accommodating portion 2A.

_{When the other end 20a 2} of the hub portion 20a of the wire reel 20 is pressed against the inner wall 200 of the _{accommodating portion 2A, a frictional force is generated between the end 20a 2} and the inner wall 200 of the accommodating portion 2A, and the wire is generated. The rotation of the reel 20 is braked.

The inner wall of the accommodating portion 2A to which the wire reel is pressed is not limited to the wall as shown in FIG. 9, and includes, for example, a shaft and ribs protruding from the wall. That is, the inner wall of the accommodating portion 2A includes all surfaces facing the wire reel 20, regardless of whether it is a flat surface or a convex surface (or concave surface). Therefore, for example, the wire reel 20 may be pressed in the G1 direction so that the other end side of the wire reel 20 is pressed against the surface of the shaft instead of the wall of the accommodating portion 2A.

In this example, the braking unit 6A ₆ is driven by a driving unit (solenoid or the like) dedicated to the braking unit, but is driven by, for example, the feed motor 32 shown in FIG. 2 or the torsion motor 51 shown in FIG. You may do so. Further, in this example, the reel holder pushes the wire reel 20 so that _{the braking portion 6A 6 also serves as the reel holder.} That is, the wire reel 20 is pressed against the wall surface of the accommodating portion 2A by moving the reel holder in the axial direction. On the other hand, the braking portion 6A ₆ may be provided separately from the reel holder. For example, the braking portion 6A ₆ may be separately arranged around the reel holder, and the wire reel 20 may be pressed from around the reel holder. As long as the wire reel 20 is pressed against the wall surface of the accommodating portion 2A in this way, the braking portion 6A ₆ may press any position of the wire reel 20.

<Structure example of the braking device of the third embodiment>
10 and 11 are block diagrams showing the braking portion of the reinforcing bar binding machine according to the third embodiment in more detail. The braking device 600A shown in FIGS. 10 and 11 is an _{example of the braking unit 6A 1} described with reference to FIG. 6, and rotates the wire reel 20 by utilizing the frictional force between the reel holder 60A and the wire reel 20. Braking. Therefore, the reel holder 60A constitutes the braking portion 6A.

First, the configuration of the wire reel 20 will be described. In the wire reel 20, a concave fitting hole portion 20c to be fitted in the reel holder 60A is formed at one end of the hub portion 20a in the axial direction. The fitting hole portion 20c is an example of a concave portion, and the inner peripheral surface is formed in a cylindrical shape. Further, in the wire reel 20, a concave hole portion 20e into which the support shaft 21b of the reel support portion 21 described later is inserted is formed at the other end portion of the hub portion 20a in the axial direction. The hole 20e is an example of a recess, and the inner peripheral surface is formed in a cylindrical shape.

Next, the accommodating portion 2A in which the wire reel 20 is accommodated 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 accommodating portion 2A includes a reel holder 60A on the wall surface of the recess 22 facing the reel supporting portion 21. The reel holder 60A is an example of the reel shaft portion, and is arranged so that it can be inserted into the fitting hole portion 20c of the hub portion 20a when accommodating the wire reel 20. In the reel holder 60A, the portion to be inserted into the fitting hole portion 20c is formed in a convex cylindrical shape according to the shape of the fitting hole portion 20c. When the fitting hole 20c of the wire reel 20 is fitted into the reel holder 60A, the wire reel 20 is rotatable with respect to the reel holder 60A. The reel holder 60A is moved in the axial direction of the wire reel 20 by a drive unit described later.

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 from a position opposite to the reel holder 60A. The support shaft 21b is configured to protrude from the reel support portion 21 and be inserted into the hole portion 20e of the hub portion 20a when the reel support portion 21 is closed. The support shaft 21b is formed in a convex cylindrical shape according to the shape of the hole 20e of the wire reel 20. When the support shaft 21b is inserted into the hole 20e of the wire reel 20, the wire reel 20 is rotatable with respect to the support shaft 21b.

When accommodating the wire reel 20 in the accommodating portion 2A, the reel support portion 21 is opened, the fitting hole portion 20c of the wire reel 20 is fitted into the reel holder 60A, and the wire reel 20 is set in the wire reel 60A. , The reel support portion 21 is closed, and the reel support portion 21 is locked in the closed state by a lock mechanism (not shown). 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 reel holder 60A 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 reel holder 60A. 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 details of the braking device 600A will be described. The braking device 600A includes a solenoid 68 that moves the reel holder 60A along the axial direction of the wire reel 20 in order to press the reel holder 60A against the wire reel 20.

The solenoid 68 is an example of a drive unit, and the reel holder 60A is fixed to the mover 68a. The solenoid 68 is a type of solenoid in which the iron core protrudes when energized. When the solenoid 68 is energized, the mover 68a is driven by the electromagnet 68b and moves in the direction of the arrow G1. The arrow G1 is the direction in which the reel holder 60A fixed to the mover 68a approaches the reel support portion 21. Further, the mover 68a moves in the direction of the arrow G2 by the force of the spring 68c. The arrow G2 is the direction in which the reel holder 60A fixed to the mover 68a is separated from the reel support portion 21.

As a result, when the solenoid 68 is energized, the reel holder 60A moves in the direction of arrow G1 due to the attractive force of the magnet or the like. When the solenoid 68 is de-energized, the reel holder 60A moves in the direction of arrow G2 by the force of the spring 68c.

When the solenoid 68 is energized with the reel holder 60A fitted in the fitting hole 20c of the wire reel 20 and the wire reel 20 attached to the reel holder 60A, the reel holder 60A moves in the direction of arrow G1. When the reel holder 60A moves in the direction of arrow G1, the reel holder 60A pushes the wire reel 20 from one end side in the axial direction. In this example, the end 69 of the reel holder 60A pushes one side end 20f of the hub portion 20a, which is one side end of the wire reel 20.

The wire reel 20 is a wire reel in the reel holder 60A when the other side end portion of the wire reel 20, in this example, the end portion 20g which is the bottom surface of the fitting hole portion 20c and the end portion 21c of the support shaft 21b are in contact with each other. When 20 is pushed from one end side in the axial direction, the movement in the axial direction is restricted. As a result, when the end portion 69 of the reel holder 60A pushes the side end portion 20f of the wire reel 20 while the wire reel 20 is rotating, the end portion 69 of the reel holder 60A and the side end portion 20f of the wire reel 20 are pressed. A frictional force is generated between the wire reel 20 and the wire reel 20, and the rotation of the wire reel 20 can be stopped.

As described above, the state in which one side end portion 20f of the wire reel 20 is pressed by the end portion 69 of the reel holder 60A along the axial direction of the wire reel 20 is referred to as a braking state. Further, the position of the reel holder 60A in the braking state is referred to as a braking position.

When the energization of the solenoid 68 is stopped and the reel holder 60A moves from the braking position in the direction of arrow G2 by the force of the spring 68c, the end portion 69 of the reel holder 60A is moved to one side end portion 20f of the hub portion 20a of the wire reel 20. Is released.

As described above, the state in which the end portion 69 of the reel holder 60A is released from pressing one side end portion 20f of the wire reel 20 is referred to as a non-braking state. Further, the position of the reel holder 60A in the non-braking state is referred to as a non-braking position.

In the braking device 600A, the solenoid 68 is controlled by the control unit 100. The control unit 100 controls the rotation and stop of the feed motor 32 by operating the trigger 10c shown in FIG. Further, the control unit 100 controls the solenoid 68 at a predetermined timing in accordance with the timing of rotating the feed motor 32 to move the reel holder 60A to the non-braking position. Further, the control unit 100 controls the solenoid 68 at a predetermined timing in accordance with the timing for stopping the feed motor 32, and moves the reel holder 60A to the braking position.

<Operation example of the braking device of the third embodiment>
Next, the operation of the braking device 600A will be described with reference to each figure. In the operation of feeding the wire W by the first feed gear 30L and the second feed gear 30R, the control unit 100 rotates the feed motor 32 in the direction indicated by the arrow f1 as shown in FIG. And the first feed gear 30L rotates in the direction of arrow f2. Further, the reel holder 60A is moved to the non-braking position without passing a current through the solenoid 68. By moving the reel holder 60A to the non-braking position, as shown in FIG. 10, the non-braking state in which the end portion 69 of the reel holder 60A is released from pressing one side end portion 20f of the wire reel 20. Become. Therefore, the wire reel 20 can rotate. As a result, the wire W is fed by the first feed gear 30L and the second feed gear 30R, and the wire reel 20 is rotated in the direction indicated by the arrow f by the feed of the wire W.

In the operation of stopping the feeding of the wire W after feeding the wire W by a predetermined amount, the control unit 100 stops the rotation of the feed motor 32 in the arrow f1 direction and coincides with the timing of stopping the rotation of the feed motor 32. Then, the solenoid 68 is energized with a predetermined braking signal to move the reel holder 60A to the braking position, and the feeding of the wire W is stopped to regulate the rotation of the wire reel 20 which is about to rotate by inertia.

As shown in FIG. 11, when the reel holder 60A moves to the braking position by energizing the solenoid 68, the end portion 69 of the reel holder 60A axes the one side end portion 20f of the hub portion 20a of the wire reel 20. Push in the direction.

As a result, the rotation of the wire reel 20 is restricted by the frictional force between the end portion 69 of the reel holder 60A and the side end portion 20f of the wire reel 20. 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 a conventional reinforcing bar binding machine, a plurality of engaging portions and protruding portions are alternately formed on the outer periphery of the flange portion of the wire reel in a substantially saw-tooth shape along the circumferential direction, and a braking member is formed on the flange portion of the wire reel. By shifting in the approaching direction, the braking member was engaged with the engaging portion, and the rotation of the wire reel was stopped.

Therefore, if the braking member operates at the timing when it enters the engaging portion, the braking member can engage with the engaging portion. On the other hand, when the braking member operates at the timing of contacting the protruding portion or its vicinity, the braking member is repelled by the protruding portion due to the rotating force of the wire reel, and the braking member is displaced in the direction away from the flange portion of the wire reel. there is a possibility. As a result, the braking member cannot be engaged with the engaging portion, and the timing of restricting the rotation of the wire reel by the braking member may be delayed.

On the other hand, in the reinforcing bar binding machine 1A of the present embodiment, the wire reel 20 is pressed from one end side in the axial direction by the reel holder 60A to which the wire reel 20 is attached, so that the wire reel 20 rotates in the direction of rotation. A load due to friction is applied to regulate the rotation of the wire reel 20.

As a result, unlike the conventional configuration in which the braking member is engaged with the portion having the uneven shape, the braking member is repelled by the force of rotation of the wire reel, so that the rotation of the wire reel cannot be regulated. There is no such thing. Therefore, the rotation of the wire reel 20 can be regulated at a desired timing by controlling the braking motor 61.

Further, 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 solenoid 68 dedicated to the braking device 600A is used instead of the torsion motor 51 to operate the braking device 600A, the operation of braking the wire reel 20 is performed. It does not affect the operation of twisting the wire W.

FIG. 12 is a configuration diagram viewed from above showing a configuration example of the braking device of the reinforcing bar binding machine according to the fourth embodiment. In the braking device 600A ₂ of the modified example, by moving the reel holder 60A to the braking position, the wire reel 20 is pressed from one end side in the axial direction, and the other end side in the axial direction of the wire reel 20 is the reel support portion 21. By pressing against the inner wall of the wire reel 20, the rotation of the wire reel 20 is braked.

In this example, the inner wall of the reel support portion 21 facing the wire reel 20 is provided with a convex portion 21d, and when the reel holder 60A moves to the braking position, the wire reel 20 is pressed from one end side in the axial direction. The flange portion 20b on the other end side of the wire reel 20 is pressed against the convex portion 21d.

<Structure example of the braking device of the fifth embodiment>
FIG. 13 is a configuration diagram showing an example of a braking device for the reinforcing bar binding machine according to the fifth embodiment, and FIG. 14 is a configuration diagram showing an example of a wire reel. First, the wire reel 20M that is braked by the braking device 600B of the fifth embodiment will be described. The wire reel 20M includes a tubular hub portion 20Ma around which the wire W is wound, and a pair of flange portions 20Mb provided on both ends in the axial direction of the hub portion 20Ma. The flange portion 20Mb has a diameter larger than the diameter of the hub portion 20Ma, and projects radially from both ends in the axial direction of the hub portion 20Ma.

In the wire reel 20M, a concave fitting hole portion 20Mc to be fitted into the reel holder 65, which will be described later, is formed at the axial end of the hub portion 20Ma. In the fitting hole portion 20Mc, convex portions 20Md ₁ and concave portions 20Md ₂ are alternately formed along the circumferential direction of the inner peripheral surface.

Further, the reel holder 65 is configured to fit into the fitting hole 20Mc of the wire reel 20M shown in FIG. 14, and has a _{recess 65b 1} that fits into _{the convex portion 20Md 1} of the fitting hole 20Mc and a fitting hole. Convex portions 65b ₂ that fit into the 20Mc recess 20Md ₂ are alternately formed along the circumferential direction of the outer peripheral surface.

As a result, when the wire reel 20M is attached to the reel holder 65, the wire reel 20M is non-rotatably supported by the reel holder 65 due to the uneven shape of the reel holder 65 and the fitting hole portion 20Mc. Therefore, the wire reel 20 rotates together with the reel holder 65. The reel holder 65 has a substantially cylindrical shape and has a space inside.

The braking device 600B has a braking member 66 that regulates the rotation of the reel holder 65. The braking member 66 is inserted into the internal space of the reel holder 65 so as to face the braking surface 65a forming a part of the inner surface (inner wall) of the internal space of the reel holder 65 (in this example, the side surface of the inner surface). It is provided as. The braking member 66 is configured to be displaceable between a first position for pressing the braking surface 65a and a second position separated from the braking surface 65a. When the braking member 66 is in the second position, the reel holder 65 is not restricted in rotation by the braking member 66, so that the wire reel 20 is in a rotatable state (non-braking state) together with the reel holder 65. On the other hand, when the braking member 66 moves to the first position and presses the braking surface 65a of the reel holder 65, a frictional force is generated between the braking member 66 and the braking surface 65a, and the rotation of the wire reel is caused. It will be in a regulated state (braking state).

The braking member 66 is displaced between a position in contact with the braking surface 65a and a position away from the braking surface 65a. In this example, the braking device 600B is provided with a pair of braking members 66.

The braking member 66 is driven by a solenoid 67, which is a driving unit, and when the mover 67a is displaced, the braking member 66 moves in both directions in a direction approaching and away from the braking surface 65a. That is, the solenoid 67 is configured to displace the braking member 66 between the first position for pressing the braking surface 65a and the second position separated from the braking surface.

In the state where the braking member 66 is moved to the first position, the braking device 600B can apply a load to the rotation of the reel holder 65 by the frictional force between the braking member 66 and the braking surface 65a, and the wire. The rotation of the reel 20M can be regulated by friction.

In this example, the braking surface 65a is the internal space side surface of the reel holder 65, but for example, a bottomed tubular reel holder may be used and the braking surface may be the internal space bottom surface (end surface or side surface). In this case, the first position is the position where the braking portion presses the bottom surface of the internal space of the reel holder. Therefore, when the braking portion is in the first position, the wire reel is braked by the frictional force between the braking portion and the bottom surface of the internal space of the reel holder.

The braking device 600B feeds the wire W in a state where the braking member 66 is separated from the braking surface 65a of the reel holder 65 and the braking member 66 is moved to a second position where the braking member 66 is not pressed against the braking surface 65a. The reel holder 65 rotates freely according to the operation. This state is called a non-braking state.

The braking device 600B is controlled by the control unit 100B. The control unit 100B controls the solenoid 67 so that the braking member 66 is in the second position when the wire reel 20 rotates, and the braking member 66 is in the first position when braking the rotation of the wire reel 20. The solenoid 67 is controlled so as to be. More specifically, the control unit 100B controls the rotation and stop of the feed motor 32 shown in FIG. 2 by operating the trigger 10c shown in FIG. 4, and at a predetermined timing according to the timing of rotating the feed motor 32. Controls the solenoid 67 to move the braking member 66 to a second position away from the braking surface 65a of the reel holder 65 to bring it into a non-braking state. Further, the control unit 100B controls the solenoid 67 at a predetermined timing in accordance with the timing for stopping the feed motor 32, and moves the braking member 66 to the first position for pressing the braking member 66 against the braking surface 65a of the reel holder 65. Put it in the braking state.

<Operation example of the braking device according to the fifth embodiment>
Next, the operation of the braking device 600B according to the fifth embodiment will be described with reference to each figure. In the operation of feeding the wire W in the direction (positive direction) of the curl forming portion, the control unit 100B rotates the feed motor 32 shown in FIG. Further, the braking member 66 is separated from the braking surface 65a of the reel holder 65 by the solenoid 67 to bring it into a non-braking state. As a result, the wire W is fed by the first feed gear 30L and the second feed gear 30R, and the wire W is fed to rotate the wire reel 20M in the direction indicated by the arrow f.

In the operation of stopping the feeding of the wire W after feeding a predetermined amount of the wire W, the rotation of the feed motor 32 is stopped and the braking member 66 is reeled by the solenoid 67 at the timing of stopping the rotation of the feed motor 32. The braking state is set in contact with the braking surface 65a of the holder 65, and the rotation of the wire reel 20M that tries to rotate by inertia is restricted by stopping the feeding of the wire W.

Assuming that the braking member 66 is in contact with the braking surface 65a of the reel holder 65, the friction between the braking member 66 and the braking surface 65a causes a force that becomes a load for rotation of the wire reel 20M in the direction of arrow f to be the wire reel. Can be hung on 20M.

As a result, the rotation of the wire reel 20M is restricted. Therefore, after the rotation of the feed motor 32 is stopped, the wire reel 20M rotates due to inertia, so that the wire W is prevented from loosening.

In the braking device 600B of the fifth embodiment, the friction between the braking member 66 and the braking surface 65a is used as a braking force on the reel holder 65 to which the wire reel 20M is attached, with respect to the direction in which the wire reel 20M rotates. A load is applied to regulate the rotation of the wire reel 20M. As a result, unlike the conventional configuration in which the braking member is engaged with the portion having the uneven shape, the rotation of the wire reel 20M can be regulated at a desired timing by controlling the solenoid 67.

Further, in the braking device 600B of the fifth embodiment, since the solenoid 67 regulates the rotation of the wire reel 20M, the operation of braking the wire reel 20M has an influence on the operation of twisting the wire W by the binding portion 5A. It has no effect.

In the braking device 600B of the second embodiment, the reel holder 65 is composed of parts different from the wire reel 20M, but it may be configured to be integrally provided with the hub portion 20Ma of the wire reel 20M. A braking surface may be formed on the wire reel itself as a recess along the axial direction.

<Structure example of the braking unit of another embodiment>
FIG. 15 is a configuration diagram viewed from above showing an example of a braking unit of another embodiment, and FIG. 16 is a configuration diagram and a diagram viewed from the front showing still another example of the braking unit of another embodiment. 17 is a perspective view of a main part showing still another example of the braking part of another embodiment.

The braking unit 6D is an example of a rotating unit and a regulating unit, and includes a braking force transmitting unit 64 that transmits the driving force of the feed motor 32 as a braking force to the reel holder 63.

The reel holder 63 is an example of a reel shaft portion, and is configured to fit into the fitting hole portion 20Mc of the wire reel 20M shown in FIG. 14, and has a concave portion 63b _{1 that fits into the convex portion 20Md 1} of the fitting hole portion 20Mc. Convex portions 63b ₂ that fit into the concave portion 20Md ₂ of the fitting hole portion 20Mc are alternately formed along the circumferential direction of the outer peripheral surface.

As a result, when the wire reel 20M is attached to the reel holder 63, the wire reel 20M is non-rotatably supported by the reel holder 63 due to the uneven shape of the reel holder 63 and the fitting hole 20Mc.

The braking force transmission unit 64 is an example of a rotating unit, and includes a gear 64a that meshes with the above-mentioned gear 34 that transmits the driving force of the feed motor 32 to the first feed gear 30L, and a gear 64b that is provided coaxially with the gear 64a. The gear 64a and the gear 64b are provided coaxially with the second feed gear 30R. The gear 34 and the gear 64a are composed of spur gears, and the gear 64b is composed of a bevel gear.

Further, the braking force transmission unit 64 includes a gear 64c that meshes with the gear 64b, a gear 64d that is provided coaxially with the gear 64c, and a gear 64e that meshes with the gear 64d. The gear 64c is composed of a bevel gear, and the gear 64d and the gear 64e are composed of spur gears.

Further, the braking force transmission unit 64 includes a brake gear 64f that meshes with the gear 64e. The braking force transmission unit 64 is composed of a predetermined number of gear combinations so that the brake gear 64f is rotated in a predetermined direction by the rotation of the feed motor 32 that rotates in the direction opposite to the direction in which the wire W is fed in the forward direction. Will be done.

In the braking force transmission unit 64, the brake gear 64f is supported by the braking shaft 64h via the first one-way bearing 64g, and the reel holder 63 is supported by the braking shaft 64h via the second one-way bearing 64i.

When the forward rotation of the feed motor 32 that sends the wire W in the forward direction is transmitted to the brake gear 64f by each gear of the braking force transmission unit 64, the brake gear 64f moves in the arrow fb direction as shown in FIG. Rotate to.

The one-way bearing has a configuration in which rotation in one direction is transmitted and rotation in the opposite direction is not transmitted. In this example, when the brake gear 64f rotates in the direction of the arrow fb, the transmission of the driving force to the braking shaft 64h is blocked by the first one-way bearing 64g, and the braking shaft 64h does not rotate.

On the other hand, when the brake gear 64f rotates in the direction of the arrow rb due to the rotation of the feed motor 32 in the opposite direction, the driving force is transmitted to the braking shaft 64h by the first one-way bearing 64g, and the braking shaft 64h is in the direction of the arrow rb. Rotate to.

Further, when the reel holder 63 to which the wire reel 20 is attached rotates in the direction of the arrow fc due to the wire W being fed in the forward direction, the transmission of the driving force to the braking shaft 64h is blocked by the second one-way bearing 64i. , The braking shaft 64h does not rotate.

On the other hand, when the feed motor 32 rotates in the opposite direction, the brake gear 64f rotates in the arrow rb direction, so that the driving force is transmitted to the braking shaft 64h by the first one-way bearing 64g, and the braking shaft 64h is indicated by the arrow. When rotated in the rb direction, the driving force is transmitted to the reel holder 63 by the second one-way bearing 64i, and the reel holder 63 rotates in the arrow rb direction.

As a result, in the state where the feed motor 32 is rotating in the positive direction, the braking unit 6D is driven by the feed of the wire W in the positive direction, and the reel holder 63 is freely rotated. That is, it is a rotating portion that rotates with the rotation of the wire reel 20M, and this state is referred to as a non-braking state.

On the other hand, when the feed motor 32 is rotated in the reverse direction, the braking unit 6D can apply a load to the reel holder 63 in the direction opposite to the rotation direction of the reel holder 63 which is driven by the feed of the wire W in the forward direction. The rotation of the wire reel 20 can be regulated by the control of the feed motor 32.

As a result, the rotation regulation of the reel holder 63 can be released and the rotation regulation can be performed by switching the rotation operation for switching the rotation direction of the feed motor 32. The feed motor 32 regulates the rotation of the wire reel 20. That is, it is a regulating part that regulates the rotation of the rotating part, and this state is called a braking state.

<Operation example of the braking unit of another embodiment>
Then refer to each figure. The operation of the braking unit 6D of another embodiment will be described. In the operation of feeding the wire W in the positive direction by the first feed gear 30L and the second feed gear 30R, as shown in FIG. 15, the feed motor 32 is rotated in the positive direction indicated by the arrow f1 to rotate the gear 34 and the gear 34. The first feed gear 30L rotates in the direction of arrow f2. As a result, the wire W is fed in the forward direction by the first feed gear 30L and the second feed gear 30R.

Further, as the feed motor 32 rotates in the forward direction, the brake gear 64f rotates in the direction of the arrow fb as shown in FIG. 17, but the driving force to the braking shaft 64h is exerted by the first one-way bearing 64g. The transmission is cut off and the braking shaft 64h does not rotate.

Further, when the wire W is fed in the forward direction and the reel holder 63 to which the wire reel 20M is attached rotates in the direction of the arrow fc, the transmission of the driving force to the braking shaft 64h is cut off by the second one-way bearing 64i. , The braking shaft 64h does not rotate.

As a result, the reel holder 63 to which the wire reel 20M is attached rotates in accordance with the feeding of the wire W independently of the rotation of the feed motor 32 in the forward direction, and the wire W wound around the wire reel 20M is rotated. Sent. By sending the wire W wound around the wire reel 20M, the rotation speed of the wire reel 20M changes when the winding diameter of the wire W in the wire reel 20M changes.

On the other hand, the rotation speed of the feed motor 32 is constant. As a result, the forward rotation of the feed motor 32 is transmitted to the reel holder 63, and when the rotation speed of the wire reel 20M becomes constant, the amount of wire W sent from the wire reel 20M changes. On the other hand, the amount of wire W fed by the first feed gear 30L and the second feed gear 30R is constant. Therefore, a problem such as loosening of the wire W or pulling of the wire W occurs between the wire reel 20M and the first feed gear 30L and the second feed gear 30R.

Therefore, by making the rotation of the feed motor 32 in the forward direction and the rotation of the reel holder 63 independent, the wire W is loosened or loosened between the wire reel 20M and the first feed gear 30L and the second feed gear 30R. It is possible to suppress the occurrence of problems such as the wire W being pulled.

In the operation of stopping the feeding of the wire W after feeding the wire W by a predetermined amount, the rotation of the feed motor 32 in the arrow f1 direction is stopped, and then the feed motor 32 is rotated in the opposite direction indicated by the predetermined amount arrow r1. .. When the feed motor 32 is rotated in the direction of arrow r1, the braking force transmission unit 64 rotates the brake gear 64f in the direction of arrow rb, as shown in FIG. When the brake gear 64f rotates in the direction of the arrow rb, the driving force is transmitted to the braking shaft 64h by the first one-way bearing 64g, and the braking shaft 64h rotates in the direction of the arrow rb.

Further, when the braking shaft 64h rotates in the direction of the arrow rb, the driving force is transmitted to the reel holder 63 by the second one-way bearing 64i, and a force for rotating the reel holder 63 in the direction of the arrow rb is applied.

As a result, a force that is a load for the rotation of the reel holder 63 in the direction of the arrow f is applied to the reel holder 63. As a result, the rotation of the wire reel 20M is restricted. Therefore, after the rotation of the feed motor 32 is stopped, the wire reel 20M rotates due to inertia, so that the wire W is prevented from loosening.

In the braking unit 6D of the other embodiment, a load is applied to the reel holder 63 to which the wire reel 20M is attached by using the force that the feed motor 32 tries to rotate as a braking force in the direction in which the wire reel 20M rotates. The rotation of the wire reel 20M is regulated. As a result, unlike the conventional configuration in which the braking member is engaged with the portion having the uneven shape, the rotation of the wire reel 20M can be regulated at a desired timing by controlling the feed motor 32.

Further, since the feed motor 32 is used instead of the twisting motor 51 to operate the braking unit 6D, the operation of braking the wire reel 20M does not affect the operation of twisting the wire W.

In the braking unit 6D, the rotation regulation of the reel holder 63 is released and the rotation is regulated by switching the rotation operation for switching the rotation direction of the feed motor 32. Therefore, the braking force transmission unit 64 has the first one-way bearing 64 g. The configuration is provided with a second one-way bearing 64i. On the other hand, one one-way bearing may be used to switch whether or not the driving force is transmitted to the reel holder 63 by switching the rotation direction of the feed motor 32. Further, in the braking portion 6D, although the reel holder 63 is composed of a component different from the wire reel 20M, it may be configured to be integrally provided with the hub portion 20Ma of the wire reel 20M.

1A ... Reinforcing bar binding machine, 10 ... Bundling machine body, 10a ... Handle part, 10c ... Trigger, 10d ... Support shaft part, 2A ... Accommodating part, 20, 20M ... Wire reel, 20a. 20Ma ... Hub part, 20b, 20Mb ... Flange part, 20c, 20Mc ... Fitting hole part, 20Md ₁ ... Convex part, 20Md ₂ ... Recessed part, 20e, 20Me ... Hole part , 20f, 20f ₄ ... side end, 20g ... end, 20h ₃ ... bottom, 20h ₄ ... side wall, 20i ₅ ... inner circumference, 21 ... reel support, 21a ... Shaft, 21b ... Support shaft, 3A ... Wire feed section, 30L ... First feed gear, 30R ... Second feed gear, 31 ... Groove section, 32 ... Feed 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, 6A ₂ , 6A ₃ , 6A ₄ , 6A ₅ , 6A ₆ , 6A ₇ , 6C, 6D ... Braking part, 600A, 600B ... Braking device, 60A, 60A ₄ , 60A ₅ , 60A ₆ , 60A ₇ ... Reel holder (reel shaft part), 61 ...・ Braking motor, 62 ・ ・ ・ Braking force transmission part, 62a, 62b, 62c ・ ・ ・ Gear, 63 ・ ・ ・ Reel holder (reel shaft part), 64 ・ ・ ・ Braking force transmission part, 64a, 64b, 64c, 64d, 64e ... Gear, 64f ... Brake gear, 64g ... First one-way bearing, 64h ... Braking shaft, 64i ... Second one-way bearing, 65 ... Reel holder (reel) Shaft), 66 ... braking member, 67 ... solenoid, 67a ... mover, 68 ... solenoid, 69, 69A _{1 , 69A 2 , 69A 3} ... end, 69a ₄ ...・ Side, 69a ₅ , ・ ・ ・ Outer circumference, 69a ₆・ ・ ・ End, W ・ ・ ・ Wire

Claims (10)

A housing unit that rotatably accommodates a tubular wire reel around which wires are wound,
A feed unit that feeds the wire wound on the wire reel,
A curl forming part that curls the wire sent by the feeding part along the circumference of the bundle, and
A binding portion that binds the bound object by twisting the curled wire at the curl forming portion, and a binding portion.
A braking unit that presses the wire reel from one end side in the axial direction to brake the rotation of the wire reel is provided .
The accommodating portion has a reel holder that rotatably supports the wire reel.
The reel holder is configured to be movable along the axial direction of the wire reel with the wire reel attached.
The braking unit is a binding machine composed of the reel holder. The braking portion presses the surface of the flange portion provided on one end side in the axial direction of the wire reel, and the frictional force generated between the braking portion and the flange portion brakes the rotation of the wire reel. The binding machine according to claim 1. The first aspect of claim 1, wherein the braking portion is configured to be insertable into a recess formed along the axial direction of the wire reel and presses at least a part of the inner surface of the recess to brake the rotation of the wire reel. Binding machine. The binding machine according to claim 3, wherein the braking portion presses the bottom surface of the inner surface of the recess to brake the rotation of the wire reel. The binding machine according to claim 3 or 4, wherein the braking portion presses a side surface of the inner surface of the recess to brake the rotation of the wire reel. A housing unit that rotatably accommodates a tubular wire reel around which wires are wound,
A feed unit that feeds the wire wound on the wire reel,
A curl forming part that curls the wire sent by the feeding part along the circumference of the bundle, and
A binding portion that binds the bound object by twisting the curled wire at the curl forming portion, and a binding portion.
Braking that brakes the rotation of the wire reel by pressing the wire reel housed in the housing portion from one end side in the axial direction and pressing the other end side of the wire reel in the axial direction against the inner wall of the housing portion. A binding machine with a part. A housing unit that rotatably accommodates a tubular wire reel around which wires are wound,
A feed unit that feeds the wire wound on the wire reel,
A curl forming part that curls the wire sent by the feeding part along the circumference of the bundle, and
A binding portion that binds the bound object by twisting the curled wire at the curl forming portion, and a binding portion.
It is inserted into a recess formed along the axial direction of the wire reel, and is configured to be displaceable between a first position that presses the inner surface of the recess and a second position that does not press the inner surface. Braking part and
A drive unit that displaces the braking unit between the first position and the second position is provided .
The accommodating portion has a reel holder that rotatably supports the wire reel.
The reel holder is configured to be movable along the axial direction of the wire reel with the wire reel attached.
The braking unit is a binding machine composed of the reel holder. The binding machine according to claim 7, wherein the first position is a position where the braking portion presses the bottom surface of the inner surface of the recess. The binding machine according to claim 7, wherein the first position is a position where the braking portion presses a side surface of the inner surface of the recess. The drive unit is controlled so that the braking unit is in the second position when the wire reel rotates, and the braking unit is in the first position when the rotation of the wire reel is braked. The binding machine according to any one of claims 7 to 9, further comprising a control unit for controlling the drive unit.

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