Binding machine

Abstract

The invention provides a reinforcing steel bar binding machine which can eliminate the necessity of matching the position deviation and the inclination deviation of the axis of an operation dial and a rotary switch. An operation unit (9) of a rebar binding machine is provided with: an operation dial (90) capable of receiving an operation for rotating the operation dial; a rotary switch (91) having a rotatable shaft (91b); and a connection section (92) that connects the shaft (91b) and the operation dial (90) so that the shaft (91b) can rotate, and that supports the operation dial (90) so that the orientation thereof can be changed with respect to the direction in which the shaft (91b) extends.

Description

Technical Field

[0001] The invention relates to a bundling machine which uses silk threads to bundle bundles such as steel bars. Background Art

[0002] In concrete structures, steel bars are used to increase strength, and they are tied together with wires to prevent them from shifting from a predetermined position during concrete pouring.

[0003] Conventionally, a so-called reinforcing bar tying machine has been proposed, which winds a wire around two or more reinforcing bars and twists the wire wound around the reinforcing bars to tie the two or more reinforcing bars with the wire (for example, see Patent Document 1).

[0004] Furthermore, a strapping machine has been proposed which includes an operating unit capable of setting the magnitude of a force for twisting a wire, and the like. In such a strapping machine, the operating unit is configured to have a rotatable dial.

[0005] As a dial-type operating switch device, a device is proposed, which comprises: a dial knob that can be rotated by a user; a rotary switch having a rotatable rotor shaft; a rotor that is engaged with the dial knob and rotates integrally with the dial knob; and a relay member that connects the rotor to the rotor shaft of the rotary switch and transmits the rotational force of the rotor to the rotor shaft (for example, refer to patent document 2).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent No. 6791141

[0009] Patent Document 2: Japanese Patent Application Publication No. 2020-136023 Summary of the invention

[0010] Problems to be solved by the invention

[0011] In a conventional dial-type operation switch device, if there is a positional offset or tilting offset between the axis of the dial knob and the rotor and the rotor shaft of the rotary switch, it is difficult to assemble them together, and a load is applied to the rotor shaft of the rotary switch. Therefore, it is necessary to make the positional offset or tilting offset between the dial knob and the rotor and the axis of the rotor shaft of the rotary switch consistent.

[0012] An object of the present invention is to provide a strapping machine that can eliminate the need to match the positional deviation or tilt deviation of the axis of an operating dial and a rotary switch.

[0013] Technical solutions to solve problems

[0014] In order to solve the above-mentioned problems, the present invention provides a strapping machine, comprising: an operating dial capable of being operated to rotate; a rotary switch having a rotatable shaft; and a connecting portion connecting the shaft and the operating dial so that the shaft can rotate and supporting the operating dial so that the posture can be changed relative to the extending direction of the shaft.

[0015] In the present invention, the axes of the operating dial and the rotary switch are relatively movable in a direction inclined with respect to the extending direction of the axis, a direction orthogonal with respect to the extending direction of the axis, and a direction along the extending direction of the axis.

[0016] Effects of the Invention

[0017] In the present invention, the connection portion can absorb the positional deviation and tilt deviation of the axis of the operating dial and the rotary switch. Therefore, even if the position of the axis of the rotary switch and the axis of the operating dial are offset, assembly can be performed. In addition, even if the axis of the rotary switch and the operating dial are not perpendicular, assembly can be performed. In addition, the load applied to the axis of the rotary switch can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an internal structure diagram seen from the side showing an example of the overall structure of the reinforcing bar binding machine according to the present embodiment.

[0019] Figure 2 It is an external perspective view showing an example of the overall structure of the reinforcing bar tying machine according to the present embodiment.

[0020] Figure 3 It is an exploded perspective view showing an example of the operation unit according to the present embodiment.

[0021] Figure 4A It is an exploded perspective view of main parts showing an example of the operation unit according to the present embodiment.

[0022] Figure 4B It is an exploded perspective view of main parts showing an example of the operation unit according to the present embodiment.

[0023] Figure 5A It is a side sectional view showing an example of the operation portion according to the present embodiment.

[0024] Figure 5B It is a side sectional view showing an example of the operation portion according to the present embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, an example of a reinforcing bar tying machine as an embodiment of the tying machine of the present invention will be described with reference to the drawings.

[0026] <Configuration Example of the Rebar Binding Machine of the Present Embodiment>

[0027] Figure 1 1 is an internal structure diagram viewed from the side showing an example of the overall structure of the reinforcing bar binding machine according to the present embodiment. Figure 2 It is an external perspective view showing an example of the overall structure of the reinforcing bar tying machine according to the present embodiment.

[0028] The reinforcing bar tying machine 1A is in a form that an operator uses by hand, and includes a main body 10 and a handle 11. The reinforcing bar tying machine 1A feeds the wire W in the forward direction indicated by the arrow F, winds it around the reinforcing bars S as the bundled object, feeds the wire W wound around the reinforcing bars S in the reverse direction indicated by the arrow R, winds it around the reinforcing bars S, and then twists the wire W to tie the reinforcing bars S with the wire W. The reinforcing bar tying machine 1A ties the reinforcing bars S with a plurality of wires W, in this example, two wires W.

[0029] In order to realize the above functions, the reinforcing bar tying machine 1A includes: a silo 2 for storing the wires W, a wire conveying unit 3 for conveying the two wires W arranged in a radial direction of the wires W, and a wire guide 4 for guiding the two wires W conveyed to the wire conveying unit 3. In addition, the reinforcing bar tying machine 1A includes: a curling forming unit 5 for forming a ring-shaped conveying path for winding the two wires W conveyed by the wire conveying unit 3 around the reinforcing bar S; and a cutting unit 6 for cutting the two wires W wound around the reinforcing bar S. In addition, the reinforcing bar tying machine 1A includes: a tying unit 7 for twisting the two wires W wound around the reinforcing bar S, and a driving unit 8 for driving the tying unit 7. In addition, the reinforcing bar tying machine 1A includes an operating unit 9 capable of setting the magnitude of the tying force for twisting the wires W and tying them.

[0030] The silo 2 stores a reel 20 on which a long wire W is wound so as to be released in a rotatable and loadable manner. The wire W is made of a plastically deformable metal wire, a resin-coated metal wire, or a twisted wire. The reel 20 is wound with two wires W, and the two wires W are pulled out from the reel 20 at the same time.

[0031] The wire conveying unit 3 includes a pair of conveying gears 30 for clamping and conveying two parallel wires W. The wire conveying unit 3 transmits the rotation of a conveying motor (not shown) to one of the pair of conveying gears 30. In addition, the pair of conveying gears 30 transmits the rotation of one conveying gear 30 to the other conveying gear 30 through the meshing of the gear parts.

[0032] The wire feeding unit 3 arranges two wires W in parallel along the direction in which the pair of feeding gears 30 are arranged. The wire feeding unit 3 switches the feeding direction of the wires W by switching the rotation direction of the feeding motor (not shown) to the forward and reverse directions to switch the rotation direction of the feeding gears 30.

[0033] The wire guide 4 is disposed upstream and downstream (not shown) of the conveying gear 30 with respect to the conveying direction of the wire W conveyed in the forward direction. The wire guide 4 guides the two wires W entering in parallel between the pair of conveying gears 30 along the arrangement direction of the pair of conveying gears 30 .

[0034] The curl forming section 5 includes: a curl guide 50 for curling the two wires W fed by the wire feeding section 3 and restricting the direction in which the two wires W are arranged side by side; and an induction guide 51 for guiding the two wires W curled by the curl guide 50 to the bundling section 7. The curl forming section 5 curls the two wires W fed by the wire feeding section 3 and passing through the curl guide 50, thereby forming a bundle from the curl guide 50 through the induction guide 51 to the bundling section 7. Figure 1 The loop-shaped conveying path Ru is shown by the two-dot chain line.

[0035] The cutting section 6 includes a fixed blade section 60, a movable blade section 61 that cuts the thread W by cooperating with the fixed blade section 60, and a transmission mechanism 62 that transmits the action of the bundling section 7 to the movable blade section 61. The cutting section 6 cuts the thread W by the rotation of the movable blade section 61 with the fixed blade section 60 as a fulcrum axis.

[0036] The binding unit 7 includes a wire locking body 70 for locking the wire W and a sleeve 71 for moving the wire locking body 70. The driving unit 8 includes a motor 80 and a speed reducer 81 for reducing speed and amplifying torque.

[0037] The reinforcing bar tying machine 1A includes a conveyance restriction portion 16 for abutting the front end of the wire W at the terminal end of the conveyance path of the wire W passing through the annular conveyance path Ru and locked by the wire locking body 70. In addition, the curl guide 50 and the guide guide 51 of the curl forming portion 5 of the reinforcing bar tying machine 1A are provided at the front end of the main body 10. Furthermore, the abutment portion 17 for abutting the reinforcing bar S of the reinforcing bar tying machine 1A is provided between the curl guide 50 and the guide guide 51 at the front end of the main body 10.

[0038] The handle portion 11 of the reinforcing bar tying machine 1A extends downward from the main body portion 10. A battery 15 is detachably mounted on the lower portion of the handle portion 11. In addition, the hopper 2 of the reinforcing bar tying machine 1A is provided in front of the handle portion 11. The reinforcing bar tying machine 1A accommodates the wire feeding portion 3, the cutting portion 6, the tying portion 7, the driving portion 8 for driving the tying portion 7, and the like in the main body portion 10.

[0039] The reinforcing bar binding machine 1A is provided with a trigger 12 on the front side of a handle 11 and a switch 13 inside the handle 11. The reinforcing bar binding machine 1A controls the conveying motor and the motor 80 by a control unit (not shown) according to the state of the switch 13 pressed by the operation of the trigger 12.

[0040] <Configuration Example of the Operation Section of the Present Embodiment>

[0041] Figure 3 1 is an exploded perspective view showing an example of the operating unit of the present embodiment. Figure 4A , Figure 4B 1 is an exploded perspective view of the main parts showing an example of the operation unit of the present embodiment. Figure 5A , Figure 5B It is a side sectional view showing an example of the operation portion according to the present embodiment.

[0042] Hereinafter, an example of the operation unit 9 of the present embodiment will be described with reference to the drawings. The operation unit 9 includes an operation dial 90, a rotary switch 91, a connection unit 92, a substrate 93, and a housing 94. In the present embodiment, as an example, the operation dial 90 is arranged on the side opposite to the binding unit 7 across the handle unit 11.

[0043] The operation dial 90 includes a dial portion 90a and a connected portion 90b. The dial portion 90a is shaped to be capable of receiving an operation to rotate the operation dial 90, and is formed into a circular shape, for example. The operation dial 90 may be configured to receive an operation to rotate in stages.

[0044] The connected portion 90b protrudes from the back side of the dial portion 90a along the axial direction of rotation of the operating dial 90. The connected portion 90b is a generally cylindrical shape with an axial end 90c protruding from the back side of the dial portion 90a and opening. The connected portion 90b is formed with a hole portion 90d extending in the axial direction from the opening of the end 90c toward the back side of the dial portion 90a.

[0045] The connected portion 90b has grooves 90e at two locations facing each other in the radial direction. The grooves 90e penetrate from the outer peripheral surface of the connected portion 90b to the hole 90d. The grooves 90e extend in the axial direction of the operation dial 90 and are connected to the end 90c.

[0046] The connected portion 90b includes a rotation angle limiting portion 90f. The rotation angle limiting portion 90f is formed by providing a concave portion and a convex portion along the circumferential direction on the outer peripheral surface of the connected portion 90b. The rotation angle limiting portion 90f engages with an elastic member (not shown) provided on the rear cover 100. Thus, the operation dial 90 is provided with a click feeling when the operation dial 90 is rotated in a state where the rotation angle is limited according to the pitch of the concave and convex portions of the rotation angle limiting portion 90f.

[0047] The operation dial 90 includes a locking portion 90g. The locking portion 90g is provided at a plurality of locations along the circumferential direction of rotation of the operation dial 90 outside the connected portion 90b along the radial direction of the operation dial 90. The locking portion 90g protrudes from the back surface of the dial portion 90a along the axial direction of rotation of the operation dial 90. The locking portion 90g is formed with a convex portion 90h protruding outward along the radial direction of the operation dial 90 at the axial end portion protruding from the back surface of the dial portion 90a.

[0048] The rear cover 100 is an example of a main body cover, and is mounted on the main body 10 of the reinforcing bar tying machine 1A. In other words, the rear cover 100 is mounted on the rear side of the main body cover near the reinforcing bar tying machine 1A. The rear cover 100, which constitutes a part of the exterior of the reinforcing bar tying machine 1A, is formed with a hole 101 of a diameter into which an imaginary circle connecting a plurality of locking portions 90g arranged in the circumferential direction enters, and a locked surface 102 to which the convex portion 90h of the locking portion 90g is locked is formed along the edge of the hole 101. In the present embodiment, as an example, the operating dial 90 is arranged so as to be recessed from the main body cover (rear cover 100) toward the inner side of the reinforcing bar tying machine 1A.

[0049] In the operation dial 90, when the connected portion 90b and the locking portion 90g are inserted into the hole 101 of the rear cover 100, the locking portion 90g is elastically deformed and the convex portion 90h passes over the edge of the hole 101, and the convex portion 90h is locked to the locked surface 102. As a result, the operation dial 90 is rotatably supported by the rear cover 100 in a state in which the locking portion 90g can move along the edge of the hole 101. The rotation center of the operation dial 90 becomes a position that is substantially consistent with the center of the hole 101. Therefore, the rotation center of the operation dial 90 is defined by the rear cover 100.

[0050] The rotary switch 91 includes a switch body 91a and a shaft 91b that can rotate relative to the switch body 91a. The switch body 91a includes a mechanism for switching the connection between internal terminals (not shown) by rotating the shaft 91b. The shaft 91b is cylindrical and rotates in the circumferential direction. The shaft 91b protrudes axially from the switch body 91a. The shaft 91b has a groove 91c extending in the axial direction formed on the outer peripheral surface. The switch body 91a is provided with an external terminal 91d on the surface opposite to the surface from which the shaft 91b protrudes.

[0051] The connection portion 92 includes a switch connection portion 92a and a dial connection portion 92b. The switch connection portion 92a is a generally cylindrical shape with one end 92c in the axial direction opened. The outer diameter of the generally cylindrical shape of the switch connection portion 92a is smaller than the inner diameter of the hole portion 90d of the connected portion 90b of the operating dial 90, and can be inserted into the hole portion 90d.

[0052] The switch connecting portion 92a is formed with a hole portion 92d extending axially from the opening of the end portion 92c. The inner diameter of the substantially cylindrical shape of the switch connecting portion 92a, i.e., the inner diameter of the hole portion 92d, is substantially the same as or slightly larger than the outer diameter of the shaft 91b of the rotary switch 91, and the shaft 91b can be inserted therein.

[0053] The switch connection part 92a includes a protrusion 92e extending in the axial direction on the inner surface of the hole 92d. The protrusion 92e protrudes radially inward at a predetermined height from the inner circumferential surface of the hole 92d and is shaped to fit into the groove 91c of the shaft 91b of the rotary switch 91.

[0054] The height of the convex portion 92e protruding radially inward from the inner circumferential surface of the hole portion 92d is a dimension that enters the groove portion 91c when the shaft 91b of the rotary switch 91 is inserted into the hole portion 92d of the switch connecting portion 92a. Thus, the connection portion 92 is restricted from freely rotating in the circumferential direction relative to the shaft 91b of the rotary switch 91.

[0055] The dial connection portion 92b protrudes from the outer peripheral surface of the switch connection portion 92a toward the radially outer side of the switch connection portion 92a. The dial connection portion 92b is provided at the other end portion of the switch connection portion 92a in the axial direction, and protrudes outward from at least two locations of the switch connection portion 92a that are opposite in the radial direction. The dial connection portion 92b is a cylindrical protrusion, and the outer diameter of the cylindrical shape is smaller than the width of the groove portion 90e of the connected portion 90b of the operating dial 90.

[0056] The height of the dial connection portion 92 b protruding radially outward from the outer peripheral surface of the switch connection portion 92 a is a dimension that enters the groove 90 e when the connection portion 92 is inserted into the hole 90 d of the connected portion 90 b of the operation dial 90 .

[0057] The substrate 93 is fixed to the housing 94 by screws (not shown) and the like, and is further sealed by resin (not shown). The external terminal 91d of the rotary switch 91 is inserted into the through hole 93a of the substrate 93, and is electrically connected and fixed by welding. Alternatively, the rotary switch 91 may be a structure in which a part of the switch body 91a is sealed with resin and fixed to the substrate 93 in a state in which the shaft 91b can rotate. The housing 94 is fixed to the rear cover 100 by screws 94a.

[0058] <Examples of Effects of the Operation Section of the Present Embodiment>

[0059] The rotary switch 91 has a connecting portion 92 mounted on a shaft 91b. The connecting portion 92 is inserted into the shaft 91b in the hole 92d of the switch connecting portion 92a. When the shaft 91b is inserted into the hole 92d, the convex portion 92e of the hole 92d enters the groove 91c of the shaft 91b. Thus, the free rotation of the connecting portion 92 in the circumferential direction relative to the shaft 91b of the rotary switch 91 is restricted.

[0060] The operation dial 90 is mounted on the rear cover 100. When the connected portion 90b and the locking portion 90g are inserted into the hole 101 of the rear cover 100, the operation dial 90 is rotatably supported by the rear cover 100.

[0061] In a state where the connecting portion 92 is attached to the shaft 91b of the rotary switch 91, when the housing 94 is attached to the rear cover 100, the connecting portion 92 is inserted into the hole 90d of the operating dial 90. The groove 90e of the operating dial 90 is connected to the end 90c of the connected portion 90b. Thus, when the connecting portion 92 is inserted into the hole 90d of the operating dial 90, the dial connecting portion 92b of the connecting portion 92 is inserted into the groove 90e of the operating dial 90.

[0062] When the operation dial 90 is rotated with the dial connection portion 92 b of the connection portion 92 inserted into the groove portion 90 e of the operation dial 90 , the force of the rotation of the operation dial 90 is transmitted to the connection portion 92 via the groove portion 90 e and the dial connection portion 92 b .

[0063] When the connection part 92 rotates, the force of the connection part 92 rotating is transmitted to the shaft 91 b via the protrusion 92 e provided in the hole 92 d of the connection part 92 and the groove 91 c of the shaft 91 b inserted into the hole 92 d of the connection part 92 .

[0064] Thus, the operation dial 90 is connected to the shaft 91b of the rotary switch 91 via the connection portion 92. When the operation dial 90 is rotated, the shaft 91b of the rotary switch 91 rotates.

[0065] like Figure 5A , Figure 5B As shown, the extension direction of the axis 91b is set to the X axis, as shown in Figure 5A As shown, the extension direction of the dial connecting portion 92b is set to the Y axis, as shown in Figure 5B As shown in FIG. 1 , the direction perpendicular to the extending direction of the dial connection portion 92b is defined as the Z axis. The operating dial 90 and the shaft 91b of the rotary switch 91 can rotate relative to each other within a predetermined angle with the dial connection portion 92b of the connection portion 92 as the rotation axis. That is, the operating dial 90 can be rotated in the direction of rotation. Figure 5B The operation dial 90 is tilted relative to the X axis with the Y axis as the rotation center in the direction of the arrow Z1. In addition, since the groove 90e of the operation dial 90 extends in the axial direction, the dial connection portion 92b of the connection portion 92 can move along the groove 90e. As a result, the operation dial 90 and the shaft 91b of the rotary switch 91 can also rotate relative to each other within a predetermined angle in a direction tilted relative to the direction in which the dial connection portion 92b of the connection portion 92 extends. That is, the operation dial 90 can be rotated in the direction of rotation. Figure 5AThe operation dial 90 is tilted relative to the X-axis with the Z-axis as the rotation center in the direction of the arrow Y1. Therefore, the operation dial 90 has a rotational freedom with respect to the switch connection portion 92a of the connection portion 92 with two axes orthogonal to the extending direction of the shaft 91b as the rotation center. Therefore, when the direction tilted relative to the extending direction of the shaft 91b (X-axis) is set as the first direction, the operation dial 90 and the shaft 91b of the rotary switch 91 can be relatively tilted within a predetermined angle in an arbitrary first direction relative to the extending direction of the shaft 91b.

[0066] Furthermore, the operation dial 90 and the shaft 91b of the rotary switch 91 can be relatively moved within a predetermined range in a direction orthogonal to the direction in which the shaft 91b extends (X axis), that is, in a second direction along the YZ plane including the Y axis and the Z axis, based on the difference between the inner diameter of the hole 90d of the operation dial 90 and the outer diameter of the connecting portion 92, the difference between the width of the groove 90e of the operation dial 90 and the outer diameter of the dial connecting portion 92b of the connecting portion 92, etc. Therefore, the operation dial 90 has a degree of freedom of movement in a direction orthogonal to the extending direction of the shaft 91b relative to the switch connecting portion 92a of the connecting portion 92.

[0067] Furthermore, the operation dial 90 and the shaft 91 b of the rotary switch 91 are relatively movable within a predetermined range in the direction in which the shaft 91 b extends, that is, in the third direction along the X axis.

[0068] As described above, the operation dial 90 is rotatably supported by the rear cover 100. In contrast, the rotary switch 91 is fixed to the housing 94 via the substrate 93. In such a structure, when the housing 94 is fixed to the rear cover 100, the operation dial 90 and the shaft 91b of the rotary switch 91 are sometimes relatively tilted within a predetermined tolerance range with respect to the axial direction. In addition, the operation dial 90 and the shaft 91b of the rotary switch 91 are sometimes relatively offset in position within a predetermined range in a direction orthogonal to the direction in which the shaft 91b extends. Furthermore, the operation dial 90 and the shaft 91b of the rotary switch 91 are sometimes relatively offset in position within a predetermined range in the axial direction.

[0069] In contrast, the operation dial 90 of the operation unit 9 is connected to the shaft 91b of the rotary switch 91 via the connection portion 92. The connection portion 92 connects the operation dial 90 and the shaft 91b of the rotary switch 91 so as to be relatively movable in a first direction inclined with respect to the extending direction of the shaft 91b, a second direction orthogonal with respect to the extending direction of the shaft 91b, and a third direction along the extending direction of the shaft 91b.

[0070] Thus, the operation unit 9 can absorb the positional deviation and tilt deviation of the axis centers of the operation dial 90 and the rotary switch 91 by the connection portion 92. Therefore, even if the axis centers of the rotary switch 91 and the operation dial 90 are offset from each other, assembly is possible. In addition, even if the axis 91b of the rotary switch 91 and the operation dial 90 are not perpendicular, assembly is possible.

[0071] Furthermore, even if the axis of the rotary switch 91 is offset from the axis of the operating dial 90, the load on the axis 91b of the rotary switch 91 can be suppressed. In addition, even if the axis 91b of the rotary switch 91 is not perpendicular to the operating dial 90, the load on the axis 91b of the rotary switch 91 can be suppressed.

[0072] Thus, when the housing 94 is fixed to the rear cover 100, it is possible to suppress the output of the rotary switch 91 from becoming erroneous due to the load applied to the shaft 91b of the rotary switch 91. In addition, the operation dial 90 is limited in rotation angle by the pitch of the concave and convex portions of the rotation angle limiting portion 90f, so that even in a state where the operation dial 90 has the freedom to move in the above-mentioned directions relative to the shaft 91b, the operator does not feel the operation dial 90 shaking, and a click feeling can be given to the operation of rotating the operation dial 90.

[0073] In the above embodiment, the dial connection portion 92b is configured to protrude outward from at least two locations of the switch connection portion 92a that are opposite in the radial direction. On the other hand, the dial connection portion 92b may be configured to be provided at three or more locations in the circumferential direction of the switch connection portion 92a. In the case of such a structure, the groove portion 90e of the operation dial 90 is provided to match the arrangement and number of the dial connection portion 92b.

[0074] In the above embodiment, the connection portion 92 includes a protrusion protruding in a radial direction intersecting the direction in which the shaft 91b extends, that is, the dial connection portion 92b, and the operating dial 90 includes a groove portion 90e into which the dial connection portion 92b is inserted. On the other hand, the operating dial 90 may include a protrusion protruding in a radial direction intersecting the direction in which the shaft 91b extends, and the connection portion 92 includes a groove portion into which the protrusion is inserted. Furthermore, the connection portion 92 may be integrally provided on the shaft 91b of the rotary switch 91.

[0075] <Operation Example of the Rebar Binding Machine of the Present Embodiment>

[0076] Next, the operation of tying the reinforcing bars S with the wires W by the reinforcing bar tying machine 1A according to the present embodiment will be described with reference to the drawings.

[0077] When the reinforcing bar S enters between the curl guide 50 and the induction guide 51 of the curl forming portion 5 and the trigger 12 is operated, the conveying motor (not shown) is driven in the forward direction, and the two wires W held by the pair of conveying gears 30 are conveyed in the forward direction indicated by the arrow F.

[0078] The wire W fed in the forward direction is fed to the crimp guide 50 of the crimp forming section 5. The wire W passes through the crimp guide 50, thereby forming a crimp trace wound around the reinforcing bar S along the loop-shaped feeding path Ru.

[0079] The wire W having a curling trace formed by the curling guide 50 is guided by the guide guide 51 and further fed in the forward direction by the wire feeding unit 3, thereby being guided to the wire locking body 70. When the front end of the wire W is fed to a position where it hits the feeding restriction unit 16, the feeding motor (not shown) stops driving.

[0080] After the forward conveyance of the wire W is stopped, the motor 80 is driven in the forward direction. The sleeve 71 is restricted from rotating in the action domain where the wire W is locked by the wire locking body 70. Thus, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves forward, i.e., in the direction of arrow A1. When the sleeve 71 moves forward, the wire W is locked by the prescribed action of the wire locking body 70.

[0081] After the sleeve 71 is advanced to a position where the wire W is locked by the wire locking body 70, the rotation of the motor 80 is temporarily stopped and the feeding motor is driven in the reverse direction.

[0082] As a result, the pair of conveying gears 30 rotate in reverse, and the wire W sandwiched between the pair of conveying gears 30 is conveyed in the reverse direction indicated by arrow R. The wire W is wound around the reinforcing bar S by the action of conveying the wire W in the reverse direction.

[0083] After the wire W is wound around the steel bar S and the reverse driving of the conveying motor is stopped, the motor 80 is driven in the forward direction, whereby the sleeve 71 further moves in the forward direction indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6 by the transmission mechanism 62, whereby the movable blade 61 rotates, and the predetermined position of the wire W is cut by the action of the fixed blade 60 and the movable blade 61.

[0084] By driving the motor 80 in the forward rotation direction and moving the sleeve 71 in the forward direction indicated by the arrow A1 to cut the two wires W, the wire W is pressed forward by the wire retaining body 70, and the front end side and the terminal side of the wire W are bent toward the steel bar S side.

[0085] After the front end and the terminal end of the wire W are bent toward the reinforcing bar S, the motor 80 is further driven in the forward direction, thereby further moving the sleeve 71 forward. When the sleeve 71 moves to a predetermined position, the restriction on the rotation of the sleeve 71 is released.

[0086] Thus, the sleeve 71 is rotated by further driving the motor 80 in the forward rotation direction, and the action of twisting the wire W held by the wire holding body 70 begins. When it is detected that the load applied to the motor 80 becomes maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse direction, the sleeve 71 moves backward, that is, in the direction of arrow A2, while the rotation is restricted.

[0087] When the sleeve 71 moves in the rearward direction, the locking of the wire W by the wire locking body 70 is released, and the wire W bundled with the reinforcing bars S is separated from the wire locking body 70 .

[0088] The reinforcing bar tying machine 1A rotates the shaft 91b of the rotary switch 91 by rotating the operating dial 90 using the operating unit 9. The control unit (not shown) of the reinforcing bar tying machine 1A controls the rotation amount of the motor 80 according to the rotation angle of the shaft 91b of the rotary switch 91. Thus, the magnitude of the tying force for twisting the wire W and tying it can be set.

[0089] Description of Reference Numerals

[0090] 1A···Rebar bundling machine, 2···Mixer, 20···Reel, 3···Wire feeding portion, 30···Feeding gear, 5···Curl forming portion, 50···Curl guide, 51···Induction guide, 6···Cut portion, 7···Bundling portion, 70···Wire fixing body, 71···Sleeve, 8···Drive portion, 80···Motor, 81···Reducer, 90···Operation dial, 90a···Dial portion, 90b···Connected portion, 90c···End portion, 90d···Hole portion, 90e···Groove portion, 90f···Rotation angle degree limiting portion, 90g···locking portion, 90h···convex portion, 91···rotary switch, 91a···switch body, 91b···shaft, 91c···groove portion, 91d···external terminal, 92···connecting portion, 92a···switch connecting portion, 92b···dial connecting portion, 92c···end portion, 92d···hole portion, 92e···convex portion, 93···substrate, 93a···through hole, 94···housing, 94a···screw, 100···rear cover (main body cover), 101···hole, 102···locked surface, W···wire.

Claims

1. A strapping machine comprising: An operating dial capable of receiving an operation to rotate it; A rotary switch having a shaft capable of rotating; and The connection portion connects the shaft and the operation dial so that the shaft can rotate, and supports the operation dial so that the operation dial can change its posture with respect to the extending direction of the shaft.

2. The strapping machine according to claim 1, wherein: The connecting portion includes a dial connecting portion protruding in a radial direction intersecting with the extending direction of the shaft. The operation dial includes a groove into which the dial connecting portion is inserted.

3. The strapping machine according to claim 2, wherein: The dial connection portion is arranged at least at two opposite locations in the radial direction.

4. The strapping machine according to claim 2, wherein: The groove portion extends along an extending direction of the shaft.

5. The strapping machine according to claim 1, wherein: The connecting portion includes a switch connecting portion connected to the shaft and extending along the extending direction of the shaft. The operation dial has a rotational freedom with respect to the switch connection portion about two axes orthogonal to the extending direction of the axis as rotation centers.

6. The strapping machine according to claim 1, wherein: The connecting portion includes a switch connecting portion connected to the shaft and extending along the extending direction of the shaft. The operation dial has a degree of freedom of movement relative to the switch connection portion in a direction orthogonal to a direction in which the shaft extends.

7. The strapping machine according to claim 1, wherein: The operating dial includes a protrusion protruding in a radial direction intersecting with the extending direction of the shaft. The connecting portion includes a groove into which the protrusion is inserted.

8. The strapping machine according to claim 1, wherein: The operating dial is rotatably supported on the main body cover. The rotary switch is supported by a housing mounted on the body cover.

9. The strapping machine according to claim 2, wherein: An outer diameter of the dial connection portion is smaller than a width of the groove portion of the operation dial.

10. The strapping machine according to claim 1, wherein: The strapping machine also has: A handle portion, which can be held by an operator with his hand; and The binding part twists the wire wound around the binding object. The operation dial is arranged on the side opposite to the binding portion across the handle portion.

11. The strapping machine according to claim 1, wherein: The strapping machine further includes a main body cover constituting a part of the exterior of the strapping machine. The operation dial is arranged so as to be recessed from the main body cover toward the inner side of the strapping machine.

12. The strapping machine according to claim 11, wherein: The strapping machine also has: A handle portion, which can be held by an operator with his hand; and The binding part twists the wire wound around the binding object. The main body cover includes a rear cover arranged on the side opposite to the binding portion across the handle portion. The operating dial is arranged on the rear cover.

13. The strapping machine according to claim 1, wherein: The operation dial is operated to be rotated in stages.

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