JP2018108850A - Binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a binding machine that allows an easy attachment and detachment of an elastic member.SOLUTION: A binding machine includes: a curl guide portion 5A for curling a wire W sent by a wire feeding portion 3A around reinforcing bars S; a binding portion 7A accommodated in a main body portion 10A, the binding portion having a rotation shaft which is provided at one end thereof with a gripping portion 70 and has a threaded portion, and a movable member 83 screwed onto the threaded portion and displaced along the rotation shaft by a rotational movement of the rotation shaft, the binding portion 7A being configured to cause the gripping portion 70 to grasp the wire W curled by the curl guide portion 5A and cause the rotation shaft to twist the grasped wire W for binding the reinforcing bars S; a driving unit 8A connected to the other end of the rotation shaft and driving the rotation shaft; and a buffer member connected to the rotation shaft in a fitting manner and provided at one end terminal of a moving path of the movable member 83. The buffer member includes: an elastic member having a hole connected to the rotation shaft in a fitting manner and a cutout portion extending in the radial direction of the rotation shaft for the split thereof; and a guide member having a hole connected to the rotation shaft in a fitting manner and covering at least a part of an outer periphery of the rotation shaft.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a binding machine that binds bundles such as reinforcing bars with wires.

  Conventionally, a binding machine called a reinforcing bar binding machine for winding a wire around a reinforcing bar and twisting the wound wire to bind the reinforcing bar has been proposed.

  A conventional reinforcing bar binding machine includes a magazine for storing a wire reel on which a wire is wound, a wire feeding unit for feeding a wire fed from the wire reel stored in the magazine, and a wire fed by the wire feeding unit. A curl guide part that curls along the periphery of the (rebar), and a bundling part that twists a wire curled by the curl guide part and binds a bundle. The magazine is provided outside the binding machine main body, the wire feeding part and the binding part are provided inside the binding machine main body, and the curl guide part is partly exposed from one end side of the binding machine main body. The binding machine main body is provided with a handle portion extending in a predetermined direction.

  The bundling portion includes a rotating shaft provided with a gripping portion for gripping the wire on one end side, a movable member that is displaced by a rotating operation of the rotating shaft, and a rotation restricting member that restricts the rotation of the movable member in conjunction with the rotating operation of the rotating shaft. Is provided. A motor is connected to the other end of the rotating shaft via a speed reducer or the like. An elastic member is provided behind the movement path of the movable member fitted to the rotation shaft to buffer the impact of collision between the members caused by the movement of the movable member (see, for example, Patent Documents 1 and 2).

Patent No. 5045548 Japanese Patent No. 4747454

  However, when the binding machine is used for a long time, it may be necessary to replace the elastic member. In the conventional binding machine, when the elastic member is attached to and detached from the rotating shaft, it is necessary to attach and detach a plurality of parts other than the elastic member such as the movable member from the rotating shaft, and it takes time to attach and remove the elastic member. .

  The present invention has been made to solve such a problem, and an object thereof is to provide a binding machine capable of easily attaching and detaching an elastic member.

  In order to solve the above-described problems, the present invention provides a binding machine main body, a wire feeding unit that is accommodated in the binding machine main body and sends a wire, and is provided on one end side of the binding machine main body, and is sent by the wire feeding unit. A curl guide part that curls the wire along the periphery of the bundle, a bundling part that is accommodated in the bundling machine body, a gripping part is provided on one end side, and a rotating shaft having a screw part, and a screw part And a movable member that is displaced along the rotation axis by the rotation of the rotation shaft. The wire curled by the curl guide portion is gripped by the grip portion, and the gripped wire is twisted by the rotation shaft and bound. A bundling unit for bundling things, a drive unit connected to the other end of the rotating shaft and driving the rotating shaft, a buffer member fitted to the rotating shaft and provided at one end of the moving path of the movable member; The shock-absorbing member has a hole that fits into the rotating shaft. A bundling comprising: an elastic member having a notch portion divided along the radial direction of the rotating shaft; and a guide member having a hole fitted to the rotating shaft and covering at least a part of the outer periphery of the elastic member. Machine.

  In this invention, since an elastic member has a notch part, an elastic member can be attached or detached with respect to a rotating shaft by letting a rotating shaft pass between notch parts.

  In the present invention, when attaching or detaching the elastic member, it is not necessary to attach or detach a plurality of components other than the elastic member from the rotating shaft, so that the elastic member can be easily attached and detached.

It is the block diagram seen from the side which shows an example of the whole structure of the reinforcing bar binding machine of this Embodiment. It is the block diagram seen from the side which shows an example of the principal part structure of the reinforcing bar binding machine of this Embodiment. It is a block diagram which shows an example of a wire feed part. It is a block diagram which shows an example of a wire feed part. It is a block diagram which shows an example of a binding part and a binding part drive mechanism. It is a block diagram which shows an example of a binding part and a binding part drive mechanism. It is a block diagram which shows an example of a binding part drive mechanism. It is operation | movement explanatory drawing which shows the detail of an example of the operation | movement which hold | grips and twists a wire.

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

<Configuration example of reinforcing bar binding machine of the present embodiment>
FIG. 1 is a side view showing an example of the overall configuration of the reinforcing bar binding machine according to the present embodiment, and FIG. 2 is a side view showing an example of the main configuration of the reinforcing bar binding machine according to the present embodiment. It is a block diagram.

  Reinforcing bar binding machine 1A of the present embodiment is a housing that an operator uses in his / her hand, and includes a main body part (binding machine main body) 10A and a handle part 11A extending from main body part 10A. The reinforcing bar binding machine 1A feeds the wire W in the positive direction, which is one direction, winds (curls) around the reinforcing bar S as an example of the bound object, and then pulls it back in the direction opposite to the positive direction. Wrap around S. Then, the reinforcing bar S is bound by the wire W by gripping and twisting a part of the wire W wound around the reinforcing bar S.

The reinforcing bar binding machine 1A is disposed on one end side of the magazine 2A, which is a storage unit in which the wire W is stored, the wire feed unit 3A that is housed in the main body unit 10A and sends the wire W, and the wire feed unit The curl guide part 5A that constitutes a path for curling the wire W sent by the part 3A along the periphery of the reinforcing bar S, the cutting part 6A that cuts the wire W wound around the reinforcing bar S, and the main body part 10A And a binding portion 7A for twisting the wire W curled on the reinforcing bar S by the curl guide portion 5A and binding the reinforcing bar S. Further, on the upstream side of the wire feed portion 3A, comprises a first wire guide 4A ₁ for guiding the wire W to be fed to the wire feed unit 3A, on the downstream side of the wire feed portion 3A, fed from the wire feed unit 3A a second wire guide 4A ₂ for guiding the wire W to be.

  In the magazine 2A, a reel 20 around which a long wire W is wound so as to be fed out is stored so as to be rotatable and detachable. In the reinforcing bar binding machine 1A of the present embodiment, two wires W are wound around the reel 20 so that the reinforcing bars S can be bundled so that the reinforcing bars S can be bound by the two wires W. As the wire W, a wire made of a metal wire that can be plastically deformed, a wire in which the metal wire is coated with a resin, a stranded wire, or the like is used. In the following description, in the direction along the direction in which the magazine 2A and the handle portion 11A are arranged, the side on which the magazine 2A indicated by the arrow F is provided is referred to as the front, and the side on which the handle portion 11A is provided is referred to as the rear.

  3 and 4 are configuration diagrams illustrating an example of the wire feeding unit. 3 A of wire feed parts are provided with the 1st feed gear 30L and the 2nd feed gear 30R which send the wire W by rotation operation as a pair of feed member which clamps and feeds the two wires W arranged in parallel.

  The first feed gear 30L includes a tooth portion 31L that transmits a driving force. The tooth portion 31L has a shape constituting a spur gear in this example, and is formed on the entire outer periphery of the first feed gear 30L. The first feed gear 30L includes a groove portion 32L in which the wire W is inserted. In this example, the groove portion 32L is formed of a concave portion having a substantially V-shaped cross section, and is formed along the circumferential direction on the entire outer periphery of the first feed gear 30L.

  The second feed gear 30R includes a tooth portion 31R that transmits a driving force. In this example, the tooth portion 31R has a shape constituting a spur gear, and is formed on the entire circumference of the second feed gear 30R. The second feed gear 30R includes a groove portion 32R into which the wire W is inserted. In this example, the groove portion 32R is formed of a concave portion having a substantially V-shaped cross section, and is formed along the circumferential direction on the entire outer periphery of the second feed gear 30R.

  The wire feed portion 3A is configured so that the groove portion 32L of the first feed gear 30L and the groove portion 32R of the second feed gear 30R are opposed to each other, and the first feed gear 30L and the second feed gear 30R are connected to the feed path of the wire W. Is provided.

  Since the wire feed section 3A holds the wire W between the first feed gear 30L and the second feed gear 30R, the first feed gear 30L and the second feed gear 30R are pressed toward each other. . As a result, the wire feed portion 3A holds the wire W between the groove portion 32L of the first feed gear 30L and the groove portion 32R of the second feed gear 30R.

  In addition, the wire feed portion 3A has a tooth portion 31L of the first feed gear 30L in a state where the wire W is sandwiched between the groove portion 32L of the first feed gear 30L and the groove portion 32R of the second feed gear 30R. The tooth portion 31R of the second feed gear 30R meshes.

  The wire feed section 3A has a feed motor 33 that drives one of the first feed gear 30L and the second feed gear 30R, in this example, the first feed gear 30L, and the driving force of the feed motor 33 as the first feed gear. A driving force transmission mechanism 34 for transmitting to the gear 30L is provided.

  The driving force transmission mechanism 34 includes a small gear 33a attached to the shaft of the feed motor 33 and a large gear 33b that meshes with the small gear 33a. The driving force transmission mechanism 34 includes a small feed gear 34a to which the driving force is transmitted from the large gear 33b and meshes with the first feed gear 30L. The small gear 33a, the large gear 33b, and the feed small gear 34a are each constituted by a spur gear.

  The first feed gear 30 </ b> L rotates when the rotation operation of the feed motor 33 is transmitted via the driving force transmission mechanism 34. The second feed gear 30R is rotated by the rotation of the first feed gear 30L transmitted by the meshing of the tooth portion 31L and the tooth portion 31R, and is driven by the first feed gear 30L.

  Thereby, wire feed part 3A sends wire W pinched between the 1st feed gear 30L and the 2nd feed gear 30R along the extension direction of wire W. In the configuration in which the two wires W are fed, a frictional force generated between the groove portion 32L of the first feed gear 30L and one wire W, and between the groove portion 32R of the second feed gear 30R and the other wire W are provided. The two wires W are fed in a state of being parallel to each other due to the generated friction force and the friction force generated between one wire W and the other wire W.

  The wire feed portion 3A switches the rotation direction of the first feed gear 30L and the second feed gear 30R by switching the rotation direction of the feed motor 33 and switches the rotation direction of the wire W. It is done.

Next, a wire guide for guiding the feeding of the wire W will be described. As shown in FIG. 2, the first wire guide 4A _1, compared feed direction of the wire W fed in the forward direction, it is arranged upstream of the first feed gear 30L and the second feed gear 30R. The second wire guide 4A _2, compared feed direction of the wire W fed in the forward direction, is arranged downstream of the first feed gears 30L and second feed gears 30R.

The first wire guide 4A ₁ and the second wire guide 4A ₂ is provided with a guide hole 40A where the wire W passes. The guide hole 40A has a shape that regulates the radial position of the wire W. The configuration to send the two wires W, the first wire guide 4A ₁ and the second wire guide 4A _2, the shape of the guide hole 40A through by parallel two wires W are formed.

The first wire guide 4A ₁ and the second wire guide 4A _2, the wire introduction section on the upstream side of the guide hole 40A relative to the feeding direction of the wire W fed in the forward direction, the opening area than the downstream A tapered shape such as a conical shape or a pyramidal shape with a large diameter. Thus, the introduction of the first wire guide 4A ₁ and second wire W to the wire guide 4A ₂ is facilitated.

  Next, the curl guide portion 5A that constitutes the feed path of the wire W that curls the wire W along the periphery of the reinforcing bar S will be described. The curl guide portion 5A guides the curl guide 50 for winding the wire W fed by the first feed gear 30L and the second feed gear 30R and the wire W fed from the curl guide 50 to the binding portion 7A. A guide 51 is provided.

  The curl guide 50 includes a first guide pin 53a and a second guide pin 53b that serve as guide members for winding the wire W in cooperation with the guide groove 52 constituting the feed path of the wire W and the guide groove 52. Is provided.

  The first guide pin 53a is provided on the introduction side of the wire W fed by the first feed gear 30L and the second feed gear 30R in the curl guide 50, and with respect to the feed path of the wire W by the guide groove 52. , The inner side of the loop Ru formed by the wire W in the radial direction. The first guide pin 53a regulates the feed path of the wire W so that the wire W fed along the guide groove 52 does not enter the inside of the radial direction of the loop Ru formed by the wire W.

  The second guide pin 53b is provided on the discharge portion side of the wire W fed by the first feed gear 30L and the second feed gear 30R in the curl guide 50, and with respect to the feed path of the wire W by the guide groove 52. The loop Ru formed by the wire W is disposed outside in the radial direction.

  The curl guide portion 5A includes a retracting mechanism 53 that retracts the first guide pin 53a. After the wire W is wound around the reinforcing bar S, the retracting mechanism 53 is displaced in conjunction with the operation of the binding portion 7A, and before the timing at which the wire W is wound around the reinforcing bar S, the first guide pin 53a is moved to the wire W. Evacuates from the path of travel.

  The guide 51 includes a first guide portion 54 that regulates the radial position of the loop Ru formed by the wire W wound around the reinforcing bar S, and a loop formed by the wire W wound around the reinforcing bar S. A second guide portion 55 that regulates the position of Ru along the axial direction Ru1 is provided.

  The first guide portion 54 is provided with a wall surface 54a formed by a surface extending along the feed direction of the wire W outside the radial direction of the loop Ru formed by the wire W wound around the reinforcing bar S. When the wire W is wound around the reinforcing bar S, the first guide portion 54 regulates the radial position of the loop Ru formed by the wire W wound around the reinforcing bar S on the wall surface 54a.

  The second guide portion 55 is provided on the introduction side of the wire W, on both sides along the axial direction Ru1 of the loop Ru formed by the wire W wound around the reinforcing bar S, and on the inner side in the radial direction of the loop Ru. A wall surface 55a is provided by a surface rising from the wall surface 54a. When the wire W is wound around the reinforcing bar S, the second guide part 55 regulates the position along the axial direction Ru1 of the loop Ru formed by the wire W wound around the reinforcing bar S on the wall surface 55a. To do.

  As a result, the position of the loop Ru wound around the reinforcing bar S in the axial direction Ru1 of the wire W fed from the curl guide 50 is regulated by the wall surface 55a of the second guide portion 55, and the second guide portion 55 It is guided to the first guide part 54.

  In this example, the first guide portion 54 is fixed to the main body portion 10A of the reinforcing bar binding machine 1A, and the second guide portion 55 is rotatable with the shaft 55b as a fulcrum. Supported by part 54. The second guide portion 55 is configured to be openable and closable in a direction in which the introduction side into which the wire W fed from the curl guide 50 enters is separated from and in contact with the curl guide 50. Thereby, after binding the reinforcing bar S with the wire W, the second guide portion 55 is retracted by the operation of pulling out the reinforcing bar binding machine 1A from the reinforcing bar S, and the operation of pulling out the reinforcing bar binding machine 1A from the reinforcing bar S is facilitated. .

  Next, the cutting part 6A that cuts the wire W wound around the reinforcing bar S will be described. The cutting part 6A includes a movable blade part 60, a rotary blade part 61 that cuts the wire W in cooperation with the movable blade part 60, and a transmission mechanism 62 that transmits the operation of the binding part 7A to the rotary blade part 61. The movable blade portion 60 includes an opening 60a through which the wire W passes, and is configured by providing an edge portion capable of cutting the wire W in the opening 60a.

The movable blade unit 60 is provided on the downstream side with respect to the feed direction of the second wire guide 4A ₂ of the wire W fed in the forward direction, the opening 60a constitutes a third wire guide.

  Further, the wire W fed by the first feed gear 30L and the second feed gear 30R has two points on the outer side in the radial direction of the loop Ru formed by the wire W and one point on the inner side between the two points. By restricting the radial position of the loop Ru formed by the wire W at at least three points, the wire W is curled.

In this example, the second wire guide 4A ₂ provided on the upstream side of the first guide pin 53a and the downstream side of the first guide pin 53a with respect to the feeding direction of the wire W sent in the forward direction. The position of the outer side in the radial direction of the loop Ru formed by the wire W is regulated at two points of the second guide pin 53b. In addition, the position of the inner side in the radial direction of the loop Ru formed by the wire W is regulated by the first guide pin 53a.

  The rotary blade portion 61 cuts the wire W passing through the opening 60a of the movable blade portion 60 by a rotation operation with the movable blade portion 60 as a fulcrum. The transmission mechanism 62 is displaced in conjunction with the operation of the binding portion 7A, and after the wire W is wound around the reinforcing bar S, the rotating blade portion 61 is rotated in accordance with the timing of twisting the wire W to cut the wire W. .

  5 and 6 are configuration diagrams illustrating an example of a binding unit and a binding unit driving mechanism, and FIG. 7 is a configuration diagram illustrating an example of a binding unit driving mechanism. Next, the binding portion 7A for binding the reinforcing bars S with the wires W will be described.

  The binding portion 7A includes a gripping portion 70 that grips the wire W curled by the curl guide portion 5A, and a bending portion 71 that bends one end WS side and the other end WE side of the wire W to the reinforcing bar S side. Prepare.

  The gripping unit 70 includes a fixed gripping member 70C, a first movable gripping member 70L, and a second movable gripping member 70R. The first movable gripping member 70L and the second movable gripping member 70R are arranged in the left-right direction via the fixed gripping member 70C. Specifically, the first movable gripping member 70L is disposed on one side along the axial direction of the wire W to be wound with respect to the fixed gripping member 70C, and the second movable gripping member 70R is on the other side. It is arranged on the side.

  In the first movable gripping member 70L and the fixed gripping member 70C, the wire W passes between the first movable gripping member 70L and the distal end side of the fixed gripping member 70C. Further, in the second movable gripping member 70R and the fixed gripping member 70C, the wire W passes between the second movable gripping member 70R and the distal end side of the fixed gripping member 70C.

  The fixed gripping member 70C includes a shaft 76 that rotatably supports the first movable gripping member 70L and the second movable gripping member 70R. The fixed gripping member 70C supports the rear end sides of the first movable gripping member 70L and the second movable gripping member 70R with a shaft 76. As a result, the first movable gripping member 70L opens and closes in a direction in which the distal end side is separated from and in contact with the fixed gripping member 70C by a rotational operation with the shaft 76 as a fulcrum. Further, the second movable gripping member 70R opens and closes in a direction in which the distal end side is separated from and in contact with the fixed gripping member 70C by a rotation operation with the shaft 76 as a fulcrum.

  The bent portion 71 has a shape that covers the periphery of the gripping portion 70, and is provided so as to be movable along the axial direction of the binding portion 7A. The bending portion 71 includes an opening / closing pin 71a for opening and closing the first movable gripping member 70L and the second movable gripping member 70R. The first movable gripping member 70L and the second movable gripping member 70R include an opening / closing guide hole 77 that opens and closes the first movable gripping member 70L and the second movable gripping member 70R by the operation of the opening / closing pin 71a.

  The open / close pin 71 a passes through the inside of the bent portion 71 and is orthogonal to the moving direction of the bent portion 71. The open / close pin 71 a is fixed to the bent portion 71 and moves in conjunction with the movement of the bent portion 71.

  The open / close guide hole 77 extends along the moving direction of the open / close pin 71a, and converts the linear movement of the open / close pin 71a into an open / close operation by rotation of the second movable gripping member 70R with the shaft 76 as a fulcrum. An opening / closing part 78 is provided. The opening / closing guide hole 77 has a first standby portion 770 extending along a moving direction of the bent portion 71 and a second standby distance extending along a moving direction of the bent portion 71. Standby unit 771. The opening / closing part 78 extends from one end of the first standby part 770 by being bent obliquely outward, and is connected to the second standby part 771. In FIG. 5, the opening / closing guide hole 77 provided in the second movable gripping member 70 </ b> R is illustrated, but the first movable gripping member 70 </ b> L is also provided with a similar opening / closing guide hole 77 in a symmetrical shape. It is done.

  As shown in FIG. 5A, the gripping portion 70 moves in the direction in which the first movable gripping member 70L and the second movable gripping member 70R move away from the fixed gripping member 70C, so that the first movable gripping member 70L and the second movable gripping member 70R move. A feed path through which the wire W passes is formed between the gripping member 70L and the fixed gripping member 70C and between the second movable gripping member 70R and the fixed gripping member 70C.

  The wire W fed by the first feed gear 30L and the second feed gear 30R passes between the fixed gripping member 70C and the second movable gripping member 70R and is guided to the curl guide portion 5A. The wire W that is curled by the curl guide portion 5A passes between the fixed gripping member 70C and the first movable gripping member 70L.

  When the folding part 71 moves in the forward direction indicated by the arrow F in FIG. 6, when the opening / closing pin 71 a pushes the opening / closing part 78 of the opening / closing guide hole 77, the first movable gripping member 70 </ b> L and the second movable gripping member 70 </ b> R. Is a rotation operation with the shaft 76 as a fulcrum, and moves in a direction approaching the fixed gripping member 70C.

  FIG.5 (c) is AA sectional drawing of FIG.5 (b). As shown in FIG. 5C, the wire W is moved between the first movable gripping member 70L and the fixed gripping member 70C by moving the first movable gripping member 70L in a direction approaching the fixed gripping member 70C. Grasped. Further, the second movable gripping member 70R moves in a direction approaching the fixed gripping member 70C, whereby the wire W is sent in the extending direction between the second movable gripping member 70R and the fixed gripping member 70C. There is.

  The bending portion 71 includes a bending portion 71b1 that presses one end WS side of the wire W gripped between the first movable gripping member 70L and the fixed gripping member 70C. The bending portion 71 includes a bending portion 71b2 that presses the other end WE of the wire W gripped between the second movable gripping member 70R and the fixed gripping member 70C.

  The bending portion 71 moves in the forward direction indicated by the arrow F, so that one end portion WS side of the wire W gripped by the fixed gripping member 70C and the first movable gripping member 70L is pushed by the bending portion 71b1, and the reinforcing bar Bend to the S side. Further, the bending portion 71 moves in the forward direction indicated by the arrow F so that the other end WE side of the wire W passed between the fixed gripping member 70C and the second movable gripping member 70R is bent at the bending portion 71b1. Press and bend to the reinforcing bar S side.

  As shown in FIG. 2, the binding unit 7 </ b> A includes a length regulating unit 74 that regulates the position of one end WS of the wire W. The length restricting portion 74 is configured by providing a member with which one end portion WS of the wire W is abutted on the feeding path of the wire W that has passed between the fixed gripping member 70C and the first movable gripping member 70L. .

  Further, the bundling portion 7A is interlocked with the rotating shaft 82 having the gripping portion 70 on one end side where the curl guide portion 5A is provided, the movable member 83 displaced by the rotating operation of the rotating shaft 82, and the rotating operation of the rotating shaft 82. A rotation restricting member 84 that restricts the rotation of the movable member 83. Further, the reinforcing bar binding machine 1A includes a drive unit 8A that is connected to the opposite side (the other end side) of the rotating shaft 82 with respect to the gripping unit 70 and drives the binding unit 7A. The drive unit 8A includes a motor 80 and a speed reducer 81 that performs deceleration and amplification of torsional torque.

  The rotating shaft 82 is driven to rotate by the motor 80 and twists the wire W gripped by the gripping portion 70. The rotating shaft 82 and the movable member 83 are configured so that the rotating operation of the rotating shaft 82 is performed by the screw portion 82 b provided on the rotating shaft 82 and the nut portion provided on the movable member 83 screwed to the screw portion 82 b. It is converted into a movement in the front-rear direction along the rotation axis 82. In the drive unit 8A, the bent portion 71 is provided integrally with the movable member 83, and the bent portion 71 moves in the front-rear direction by the movement of the movable member 83 in the front-rear direction.

  The movable member 83 and the bending portion 71 and the gripping portion 70 supported by the bending portion 71 are locked to the rotation restricting member 84 in the operation range where the gripping portion 70 grips the wire W and the bending portion 71 bends the wire W. As a result, the rotation restricting member 84 moves in the front-rear direction while the rotation operation is restricted. In addition, the movable member 83, the bent portion 71, and the gripping portion 70 are rotated by the rotation operation of the rotating shaft 82 by being removed from the locking of the rotation regulating member 84.

  In the gripping portion 70, the fixed gripping member 70 </ b> C, the first movable gripping member 70 </ b> L, and the second movable gripping member 70 </ b> R that grip the wire W rotate in conjunction with the rotation of the movable member 83 and the bending portion 71.

  The retraction mechanism 53 of the first guide pin 53a described above is configured by a link mechanism that converts the movement of the movable member 83 in the front-rear direction into the displacement of the first guide pin 53a. Further, the transmission mechanism 62 of the rotary blade portion 61 is configured by a link mechanism that converts the movement of the movable member 83 in the front-rear direction into the rotation operation of the rotary blade portion 61.

  When the movable member 83 moves rearward, the movable member 83 collides with a flange 82c positioned rearward of the rotary shaft 82 with respect to the movable member 83. As a buffer member for buffering the impact of the collision, the binding portion 7A further includes a guide plate 85, a guide member 86, and a bumper 87 as an example of an elastic member sandwiched between the guide plate 85 and the guide member 86. These buffer members are fitted to the rotary shaft 82 and provided at the rear end (one end) of the moving path of the movable member 83 so as to contact the front of the flange 82c. When the movable member 83 moves to the front end (the other end) of the movement path, the twisting operation of the wire W ends. The rotating shaft 82 has a groove 82a along the circumferential direction of the rotating shaft 82 in the rear of the screw portion 82b and in front of the guide plate 85. An arc-shaped ring 88 is fitted into the groove 82a so as to protrude from the groove 82a.

  As shown in FIG. 7B, the guide plate 85 has a hole 85 a that fits into the rotation shaft 82, and is supported so as to be movable in the front-rear direction with respect to the rotation shaft 82. The guide member 86 has a hole 86 c that fits into the rotation shaft 82. The guide member 86 is movable in the front-rear direction with respect to the rotation shaft 82 and is provided in front of the guide plate 85. As shown in FIG. 7C, the guide member 86 has a wall 86 a that is a convex portion that protrudes toward the guide plate 85. The wall 86 a is erected from the entire periphery of the outer peripheral edge portion of the surface 86 b that faces the guide plate 85. The outer diameter of the surface 86 b of the guide member 86 is set slightly larger than the outer diameter of the guide plate 85. Therefore, the guide plate 85 and the guide member 86 sandwich the bumper 87 so that the guide plate 85 enters the inside of the wall 86a.

  The bumper 87 is made of an elastic material such as rubber. As shown in FIG. 7A, the bumper 87 has an arc shape having a hole 87b fitted to the rotating shaft 82, and between the both ends of the arc shape, the hole 87b extends from the rotating shaft 82. A notch 87a is formed that is divided along the radial direction. Since the outer diameter of the bumper 87 is set smaller than the outer diameter of the surface 86b of the guide member 86, the bumper 87 is placed inside the wall 86a when the bumper 87 is sandwiched between the guide plate 85 and the guide member 86. Enters.

  In the ring 88, a notch 88 a that is divided along the radial direction of the rotating shaft 82 is formed between both ends of the arc shape. When the ring 88 is fitted into the groove 82 a in a state where the guide plate 85 and the bumper 87 are in contact with each other, and the bumper 87 and the guide member 86 are in contact, the ring 88 sandwiches the guide member 86 between the guide member 86 and the guide member 86. The movement in the front-rear direction is restricted. In this state, the bumper 87 is sandwiched between the wall 86 a of the guide member 86 and the rotating shaft 82, and the bumper 87 is restricted from being detached from the rotating shaft 82. When the ring 88 is removed from the groove 82a, the restriction of the movement of the guide member 86 in the front-rear direction is released, so that the guide member 86 can move in the front-rear direction along the rotation shaft 82. If the guide member 86 is moved forward in this state, the sandwiching of the bumper 87 by the wall 86a and the rotating shaft 82 is released, so that the bumper 87 can be removed from the rotating shaft 82.

  A trigger 12A is provided on the front side of the handle portion 11A, and the control unit 14A controls the feed motor 33 and the motor 80 in accordance with the state of the switch 13A that is pressed by the operation of the trigger 12A. A battery 15A is detachably attached to the lower portion of the handle portion 11A.

<Operation example of reinforcing bar binding machine of this embodiment>
FIG. 8 is an operation explanatory view showing details of an example of the operation of gripping and twisting the wire. Next, referring to each drawing, the reinforcing bar binding machine 1A of the present embodiment is used to connect the reinforcing bar S with the wire W. The operation of binding will be described.

  In the reinforcing bar binding machine 1A, the wire W is sandwiched between the first feed gear 30L and the second feed gear 30R, and the tip of the wire W is connected to the first feed gear 30L and the second feed gear 30R. The state located between the cutting position and the movable blade part 60 of the cutting part 6A is the standby state. In the standby state, as shown in FIG. 5A, the reinforcing bar binding machine 1A opens the first movable gripping member 70L with respect to the fixed gripping member 70C, and the second movable gripping member 70R is the fixed gripping member. It is in the open state with respect to 70C. The movable member 83 is in a state located at the rear end of the movement path.

  When the reinforcing bar S is inserted between the curl guide 50 and the guide 51 of the curl guide portion 5A and the trigger 12A is operated, the feed motor 33 is driven in the forward rotation direction, and the first feed gear 30L rotates forward. At the same time, the second feed gear 30R rotates normally following the first feed gear 30L. Thereby, the two wires W sandwiched between the first feed gear 30L and the second feed gear 30R are fed in the forward direction.

To the feed direction of the wire W fed in the forward direction, the first wire guide 4A ₁ is provided on the upstream side of the wire feed portion 3A, that the second wire guide 4A ₂ is provided on the downstream side, two The wires W are sent in parallel.

When the wire W is fed in the forward direction, the wire W passes between the fixed gripping member 70C and the second movable gripping member 70R and passes through the guide groove 52 of the curl guide 50 of the curl guide portion 5A. Thereby, the wire W includes a second wire guide 4A _2, at three points of the first guide pin 53a and the second guide pin 53b of the curl guide 50, curl to be wound around the reinforcing bars S Attached.

  The wire W fed out from the curl guide 50 is guided between the fixed gripping member 70C and the first movable gripping member 70L by the guide guide 51. Then, when the tip of the wire W is sent to a position where it abuts against the length restricting portion 74, the drive of the feed motor 33 is stopped. Thereby, the wire W is wound around the reinforcing bar S in a loop shape as shown in FIG.

  After stopping the feeding of the wire W, the motor 80 is driven in the forward rotation direction, so that the motor 80 moves the movable member 83 in the arrow F direction which is the forward direction. That is, in the movable member 83, the rotation operation linked to the rotation of the motor 80 is regulated by the rotation regulating member 84, and the rotation of the motor 80 is converted into a linear movement. As a result, the movable member 83 moves in the forward direction.

  In conjunction with the movement of the movable member 83 in the forward direction, the bent portion 71 moves in the forward direction without rotating together with the movable member 83. When the bent portion 71 moves in the forward direction, the open / close pin 71 a passes through the open / close portion 78 of the open / close guide hole 77 as shown in FIG.

  As a result, the first movable gripping member 70L moves in a direction approaching the fixed gripping member 70C by a rotation operation with the shaft 76 as a fulcrum. Therefore, the one end WS side of the wire W is gripped between the first movable gripping member 70L and the fixed gripping member 70C. Further, the second movable gripping member 70R moves in a direction approaching the fixed gripping member 70C by a rotation operation with the shaft 76 as a fulcrum. Therefore, the other end WE side of the wire W is gripped between the second movable gripping member 70 </ b> R and the fixed gripping member 70 </ b> C while being movable in the extending direction of the wire W.

  Further, when the movable member 83 moves in the forward direction, the operation of the movable member 83 is transmitted to the retracting mechanism 53, and the first guide pin 53a is retracted.

  After the movable member 83 is advanced to the position where the wire W is gripped by the opening / closing operation of the first movable gripping member 70L and the second movable gripping member 70R, the rotation of the motor 80 is temporarily stopped and the feed motor 33 is rotated in reverse. Drive in the direction. As a result, the first feed gear 30L is reversely rotated, and the second feed gear 30R is reversely driven following the first feed gear 30L.

  Therefore, the wire W clamped between the first feed gear 30L and the second feed gear 30R is sent in the reverse direction. In the operation of feeding the wire W in the reverse direction, the wire W is wound so as to be in close contact with the reinforcing bar S as shown in FIG.

  After the wire W is wound around the reinforcing bar S and driving of the feed motor 33 in the reverse rotation direction is stopped, the movable member 83 is moved in the forward direction by driving the motor 80 in the forward rotation direction. The movement of the movable member 83 in the forward direction is transmitted to the cutting portion 6A by the transmission mechanism 62, whereby the rotary blade portion 61 rotates, and the wire W gripped by the second movable gripping member 70R and the fixed gripping member 70C. The other end portion WE side is cut by the operation of the movable blade portion 60 and the rotary blade portion 61.

  When the reinforcing bar S is bound with two wires W as in this example, the diameter of the wire W can be changed as long as a binding strength equivalent to that when the reinforcing bar S is bound with one wire as in the prior art is obtained. It can be made thinner. For this reason, the wire W can be easily bent and the wire W can be brought into close contact with the reinforcing bar S with a small force. Therefore, the wire W can be reliably wound around the reinforcing bar S with a small force. Moreover, the load at the time of cutting the wire W can be reduced. Along with this, it is possible to reduce the size of each motor of the reinforcing bar binding machine 1A and to reduce the size of the entire main body by reducing the size of the mechanical part. In addition, power consumption can be reduced by downsizing the motor and reducing the load.

  After the wire W is cut, the movable member 83 is further moved in the forward direction, whereby the bent portion 71 is moved in the forward direction integrally with the movable member 83 as shown in FIG. One end WS side of the wire W gripped by the fixed gripping member 70C and the first movable gripping member 70L by the bending portion 71 moving in a direction approaching the reinforcing bar S that is the forward direction indicated by the arrow F. Is pressed to the reinforcing bar S side by the bending portion 71b1 and bent to the reinforcing bar S side with the gripping position as a fulcrum. As the bent portion 71 moves further forward, the one end WS side of the wire W is held between the first movable gripping member 70L and the fixed gripping member 70C.

  Further, when the bending portion 71 moves in a direction approaching the reinforcing bar S which is the forward direction indicated by the arrow F, the other end portion of the wire W gripped by the fixed gripping member 70C and the second movable gripping member 70R. The WE side is pressed to the rebar S side by the bending portion 71b2, and bent to the rebar S side with the gripping position as a fulcrum. As the bending portion 71 moves further forward, the one end WE side of the wire W is supported between the second movable gripping member 70R and the fixed gripping member 70C.

  After the end portion of the wire W is bent to the reinforcing bar S side, the motor 80 is further driven in the forward rotation direction, so that the motor 80 further moves the movable member 83 in the arrow F direction which is the forward direction. When the movable member 83 moves to a predetermined position in the direction of the arrow F, the movable member 83 comes off from the locking of the rotation restricting member 84, and the restriction of rotation by the rotation restricting member 84 of the movable member 83 is released.

  As a result, when the motor 80 is further driven in the forward rotation direction, the gripping portion 70 that grips the wire W rotates integrally with the bent portion 71, and the wire W is moved as shown in FIG. Twist.

  After the wire W is twisted, the movable member 83 is located at the front end of the movement path, and the motor 80 is driven in the reverse rotation direction, so that the motor 80 indicates the movable member 83 with an arrow R. Move backwards. That is, in the movable member 83, the rotation operation linked to the rotation of the motor 80 is regulated by the rotation regulating member 84, and the rotation of the motor 80 is converted into a linear movement.

  As a result, the movable member 83 moves backward. In conjunction with the movement of the movable member 83 in the backward direction, the first movable gripping member 70L and the second movable gripping member 70R are displaced in a direction away from the fixed gripping member 70C, and the gripping portion 70 releases the wire W. .

  The movable member 83 moves rearward and collides with a guide member 86 provided at the rear end of the movement path of the movable member 83. The impact that the movable member 83 collides with the guide member 86 is buffered by the bumper 87 and transmitted to the guide plate 85. Since the shock applied to the guide plate 85 by the bumper 87 is buffered, the impact sound is also reduced. When the movable member 83 finishes moving in the backward direction, the reinforcing bar binding machine 1A enters a standby state.

<Example of effects of the reinforcing bar binding machine of the present embodiment>
When replacing the bumper 87 fitted to the rotary shaft 82, such as when the reinforcing bar binding machine 1A is used for a long period of time, the bumper 87 attached to the rotary shaft 82 is first removed from the rotary shaft 82, and then a new bumper is installed. The operation of attaching 87 to the rotary shaft 82 is performed.

  Specifically, when removing the bumper 87 from the rotating shaft 82, first, the binding portion 7A and the drive portion 8A are removed from the main body portion 10A. In this state, the ring 88 enters the groove 82 a and is fitted to the rotating shaft 82, and restricts the guide member 86 from moving back and forth along the rotating shaft 82. Further, the wall 86 a of the guide member 86 restricts the bumper 87 from being detached from the rotation shaft 82. The bumper 87 is sandwiched between the surface 86 b of the guide member 86 and the guide plate 85.

  When the binding portion 7A and the drive portion 8A can be removed from the main body portion 10A, as shown by the arrow a1 in FIG. 7B, the rotation shaft 82 passes through the notch 88a of the ring 88, and the ring 88 is moved to the rotation shaft 82. Remove from the groove 82a. When the ring 88 is disengaged from the rotation shaft 82, the guide member 86 can be moved back and forth along the rotation shaft 82. Therefore, the guide member 86 is moved to the front movable member 83 side as indicated by an arrow a2. The movement of the guide member 86 releases the bumper 87 between the guide plate 85 and the guide member 86 and also releases the bumper 87 between the wall 86 a and the rotating shaft 82. That is, the bumper 87 can be moved in the front-rear direction and removed from the rotating shaft 82. The bumper 87 is removed from the rotation shaft 82 as indicated by an arrow a3 so that the rotation shaft 82 passes through the notch 87a.

  When the bumper 87 is attached to the rotating shaft 82, the rotating shaft 82 passes through the notch 87 a, and the bumper 87 is guided to the guide member 86 of the rotating shaft 82 and the guide as indicated by an arrow a 4 in FIG. Attached between the plate 85. When the bumper 87 is attached to the rotation shaft 82, the guide member 86 is moved rearward along the rotation shaft 82 as indicated by an arrow a5. When the guide member 86 is moved until the guide member 86 comes to the bumper 87 side behind the groove 82a, the rotary shaft 82 passes through the notch 88a of the ring 88, and as shown by an arrow a6, in the groove 82a. Fit the ring 88. As a result, the ring 88 is fitted into the groove 82 a, and the guide member 86 is restricted so that it cannot move back and forth along the rotation shaft 82. The wall 86a of the guide member 86 regulates the bumper 87 so as not to leave the rotating shaft 82. The bumper 87 is sandwiched between the guide member 86 and the guide plate 85. When the ring 88 is fitted to the rotary shaft 82, the binding portion 7A and the drive portion 8A are attached to the main body portion 10A.

  Since the bumper 87 has an arc shape having a notch 87a, when the bumper 87 is attached to or detached from the rotating shaft 82, it is not necessary to attach or detach the guide member 86 or the like from the rotating shaft 82. It is only necessary to attach and detach 88. That is, when the bumper 87 is attached to and detached from the rotating shaft 82, it is not necessary to attach and detach a plurality of parts other than the bumper 87 from the rotating shaft 82, and the rotating shaft 82 passes through the notch portion 87a. The bumper 87 can be easily attached to and detached from the shaft 82.

  Since the guide member 86 has a wall 86a erected toward the guide plate 85, the bumper 87 fitted to the rotary shaft 82 and sandwiched between the guide member 86 and the guide plate 85 is the reinforcing bar binding machine 1A. During the operation, the rotating shaft 82 is not unintentionally detached. In addition, although the wall 86a of this Embodiment is standingly arranged from the perimeter of the outer peripheral part of the surface 86b facing the guide plate 85, it is not restricted to this. The guide member 86 only needs to cover at least a part of the outer periphery of the bumper 87 with a wall so that the bumper 87 fitted to the rotary shaft 82 is not unintentionally detached from the rotary shaft 82. A portion having no wall may be provided on the outer peripheral edge, or a plurality of walls may be provided from the outer peripheral edge of the surface 86b.

  In the present embodiment, the outer diameter of the surface 86b of the guide member 86 is such that the wall 86a of the guide member 86 and the guide plate 85 do not collide when the movable member 83 collides with the guide member 86. Although it is set to be slightly larger than the outer diameter, it is not limited to this. When the bumper 87 is thicker than the wall 86a is erected toward the guide plate 85, the wall 86a and the guide plate 85 do not collide even when the movable member 83 collides with the guide member 86. The outer diameter of the surface 86 b of the member 86 may be the same as the outer diameter of the guide plate 85 or may be smaller than the outer diameter of the guide plate 85.

  In the present embodiment, the outer peripheral shape of the guide plate 85 and the surface 86b of the guide member 86 is circular and the bumper 87 is circular, but the present invention is not limited to this. The outer peripheral shape of the surface 86b of the guide plate 85 and the guide member 86 may be a rectangle or a polygon. The bumper 87 has a notch 87a that is divided along the radial direction of the rotary shaft 82. If the bumper 87 has a shape that can be attached to and detached from the rotary shaft 82, the outer peripheral shape thereof may be a rectangle or a polygon. Good. Further, the bumper 87 is not sandwiched between the rotary shaft 82 and the wall 86a of the guide member 86 so as not to be detached from the rotary shaft 82, and may be formed of a plurality of members.

  DESCRIPTION OF SYMBOLS 1A ... Reinforcing bar binding machine, 2A ... Magazine, 20 ... Reel, 3A ... Wire feed part, 5A ... Curl guide part, 6A ... Cutting part, 7A ... Binding part, 8A ... Drive unit, 12A ... Trigger, 30L ... First feed gear, 30R ... Second feed gear, 31L ... Tooth, 32L ... Groove, 31R ... Tooth part, 32R ... groove part, 33 ... feed motor, 34 ... driving force transmission mechanism, 50 ... curl guide, 51 ... guide guide, 52 ... guide groove, 53 ... Retraction mechanism, 53a, 53b ... guide pin, 54 ... first guide part, 54a ... wall surface, 55 ... movable guide part, 55a ... wall surface, 55b ... shaft, 60 ...・ Moving blade part, 61... Rotating blade part, 62... Transmission mechanism, 70. Fixed gripping member, 70L ... first movable gripping member, 70R ... second movable gripping member, 71 ... folded portion, 71a ... opening / closing pin, 76 ... shaft, 77 ... Opening / closing guide hole, 78 ... opening / closing part, 80 ... motor, 81 ... reduction gear, 82 ... rotating shaft, 82a ... groove, 83 ... movable member, 85 ... guide plate 86 ... Guide member, 86a ... Wall, 87 ... Bumper (elastic member), 87a ... Notch, 88 ... Ring, S ... Reinforcing bar (bonded material), W ...・ Wire

Claims (5)

The binding machine body,
A wire feed section that is housed in the binding machine body and feeds the wire;
A curl guide part provided on one end side of the binding machine main body and curling the wire sent by the wire feeding part along the periphery of the binding object;
A bundling portion accommodated in the bundling machine main body, wherein a rotating shaft having a grip portion at one end side and having a screw portion, and a rotating shaft screwed into the screw portion to rotate the rotating shaft. A bundling portion that grips the wire curled by the curl guide portion with the grasping portion, twists the grasped wire with the rotation shaft, and binds a bundle.
A drive unit connected to the other end of the rotary shaft and driving the rotary shaft;
A buffer member fitted to the rotating shaft and provided at one end of the moving path of the movable member;
The buffer member is
An elastic member having a hole fitted into the rotating shaft and having a notch portion cut along a radial direction of the rotating shaft;
A bundling machine comprising: a guide member having a hole fitted to the rotation shaft and covering at least a part of the outer periphery of the elastic member. The binding machine according to claim 1, further comprising a ring that is fitted to the rotation shaft and sandwiches the guide member with the elastic member. The binding machine according to claim 1, wherein the guide member has a wall erected from a peripheral edge portion and covers at least a part of an outer periphery of the elastic member with the wall. The binding machine according to claim 1, further comprising a guide plate that has a hole that fits into the rotation shaft and sandwiches the elastic member between the guide member and the elastic member.   The binding device according to any one of claims 1 to 4, wherein the elastic member is detachably provided from the rotating shaft via the notch.

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