JP6726988B2 - Rebar binding machine - Google Patents

Description

The technology disclosed in this specification relates to a reinforcing bar binding machine.

Patent Document 1 discloses a reinforcing bar binding machine that binds a plurality of reinforcing bars with wires. The reinforcing bar binding machine includes a cutting mechanism that cuts the wire, a holding mechanism that holds the cut end of the wire, a twisting mechanism that twists the wire, and a binding machine body that holds the cutting mechanism, the holding mechanism, and the twisting mechanism. ing. The holding mechanism includes a first holding member connected to the binding machine main body and a second holding member connected to a link that interlocks with the twisting mechanism.

JP, 9-165917, A

In the reinforcing bar binding machine of Patent Document 1, it is necessary to previously adjust the holding interval between the first holding member and the second holding member when the holding mechanism holds the wire, according to the diameter of the wire to be used. Therefore, when using wires having different diameters, the user has to readjust the holding interval between the first holding member and the second holding member. In the reinforcing bar binding machine, there is expected a technique capable of enabling the use of wires having various diameters without the user having to readjust the holding interval of the wires in the holding mechanism.

The present specification discloses a reinforcing bar binding machine for binding a plurality of reinforcing bars by a wire. The reinforcing bar binding machine holds a cutting mechanism for cutting the wire, a clamping mechanism for clamping the cut end of the wire, a twisting mechanism for twisting the wire by rotation of a torsion motor, a cutting mechanism, a clamping mechanism and a twisting mechanism. It has a binding machine body. The holding mechanism includes a first holding member connected to the binding machine body and a second holding member connected to a link driven by the rotation of the torsion motor. The first clamping member and the second clamping member elastically clamp the cut end of the wire.

The reinforcing bar binding machine is configured such that the first pinching member and the second pinching member elastically pinch the cut end of the wire. Therefore, the sandwiching distance between the first sandwiching member and the second sandwiching member is adjusted by elastic deformation according to the diameter of the wire, and the first sandwiching member and the second sandwiching member can securely sandwich the wire. Wires of various diameters can be used without the need for the user to readjust the wire holding interval in the holding mechanism. The term "elastically sandwiching" as used herein may mean that the first sandwiching member and/or the second sandwiching member is made of an elastic material, or the first sandwiching member and the binding machine body are elastic members. The second holding member and the link may be connected via an elastic member. In any case, since the difference in wire diameter is absorbed by elastic deformation, it is possible to use wires of various diameters without the need for the user to readjust the wire holding interval in the holding mechanism. You can

It is a perspective view which shows the external appearance of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the external appearance of the reinforcing bar binding machine 2 which concerns on an Example in the state which the cover 17 opened and the support member 200 closed. FIG. 6 is a perspective view showing an appearance of the reinforcing bar binding machine 2 according to the embodiment in a state where the cover 17 is opened and the support member 200 is opened by the slide switch 204. It is sectional drawing in the state which the support member 200 closed of the accommodation mechanism 30 of the reinforcing bar binding machine 2 which concerns on an Example. It is sectional drawing in the state which the support member 200 opened of the accommodation mechanism 30 of the reinforcing bar binding machine 2 which concerns on an Example. 3 is a perspective view showing a state in which the support member 200 of the movable bearing 198, the support member 200, the torsion spring 202, the slide switch 204, and the reel 10 of the reinforcing bar binding machine 2 according to the embodiment is closed. FIG. FIG. 3 is a perspective view of a movable bearing 198, a supporting member 200, a torsion spring 202, a slide switch 204, and a reel 10 of the reinforcing bar binding machine 2 according to the embodiment, showing a state in which the supporting member 200 is opened by the slide switch 204. It is a perspective view which shows the external appearance of the feed mechanism 32 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the internal structure of the 1st guide passage 64 of the reinforcing bar binding machine 2 which concerns on an Example. It is sectional drawing which shows the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the internal structure of the binding machine main body 4 and the grip 6 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the state which opened the lower side curl guide 62 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the state which closed the lower side curl guide 62 of the reinforcing bar binding machine 2 which concerns on an Example. It is a figure which shows the contact piece 80a of the opening/closing detection mechanism 78 of the reinforcing bar binding machine 2 and the opening/closing detection opening 80d of the left outer housing 14 according to the embodiment. It is a perspective view which shows the OFF state of the brake mechanism 36 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the ON state of the brake mechanism 36 of the reinforcing bar binding machine 2 which concerns on an Example. It is a figure which shows the brake arm 92 of the brake mechanism 36 of the reinforcing bar binding machine 2 and the brake opening 92a of the inner housing 16 which concern on an Example. FIG. 6 is a perspective view showing an internal structure of a first guide passage 64 in a state where a swing member 286 swings with respect to a fixed member 284 in the reinforcing bar binding machine 2 according to the embodiment. It is a perspective view which shows the twist mechanism 40 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows the internal structure of the 1st reduction mechanism 98 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows the internal structure of the 2nd reduction mechanism 100 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the holding mechanism 102 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the screw shaft 120, the front-end|tip axis|shaft 132, the right hook 134, and the left hook 136 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the right hook 134 and the left hook 136 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the rotation limiting mechanism 156 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows operation|movement of the holding mechanism 102 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows operation|movement of the holding mechanism 102 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows operation|movement of the holding mechanism 102 of the reinforcing bar binding machine 2 which concerns on an Example. It is a cross-sectional perspective view which shows operation|movement of the holding mechanism 102 of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the mode of the assembly work of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the mode of the assembly work of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view showing a situation of an assembly work of rebar binding machine 2 concerning an example. It is a perspective view which shows the mode of the assembly work of the reinforcing bar binding machine 2 which concerns on an Example. It is a perspective view which shows the mode of the assembly work of the reinforcing bar binding machine 2 which concerns on an Example.

In one or more embodiments, the first holding member may be connected to the binding machine body via an elastic member.

According to the above configuration, since the difference in the diameter of the wire is absorbed by the elastic deformation of the elastic member, it is possible to use the wire of various diameters without the user having to readjust the holding interval of the wire in the holding mechanism. Can be

In one or more embodiments, the rebar tying machine may further include a feed mechanism that feeds the wire, and a guide mechanism that guides the wire fed from the feed mechanism around the plurality of rebars. The feed mechanism and the guide mechanism may be held by the binding machine body. The guide mechanism may include a guide pin that guides the wire. The guide pin may be rotatably supported by the binding machine body.

The guide pin guides the wire by slidingly contacting the wire. When the guide pin is non-rotatably supported by the binding machine body, a large frictional force acts on the guide pin when the wire is fed, and the guide pin is easily worn. On the other hand, in the above reinforcing bar binding machine, since the guide pin is rotatably supported by the binding machine body, the frictional force acting on the guide pin when the wire is fed can be significantly reduced. The wear of the guide pin can be suppressed.

In one or more embodiments, the rebar tying machine may further include a feed mechanism that feeds the wire, and a guide mechanism that guides the wire fed from the feed mechanism around the plurality of rebars. The feed mechanism and the guide mechanism may be held by the binding machine body. The guide mechanism may include a guide pin that guides the wire and a guide wall that guides the wire.

The guide pin guides the wire by slidingly contacting the wire in a point contact manner. When guiding the wire using the guide pin, the contact position between the wire and the guide pin is constant, so that the bending diameter of the wire can be managed accurately, but since a large frictional force acts on the guide pin, It is necessary to use an expensive material having high wear resistance. On the other hand, the guide wall slides in line contact with the wire to guide the wire. When guiding the wire using the guide wall, since a large frictional force does not act on the guide wall, an inexpensive material with low wear resistance can be used, but the contact position between the wire and the guide wall becomes indefinite. Therefore, the bending diameter of the wire cannot be accurately controlled. In the above reinforcing bar binding machine, the guide wall is used instead of the guide pin within a range that does not significantly affect the management of the bending diameter of the wire, thereby reducing the material cost compared with the case where the wire is guided only by the guide pin. be able to.

Another rebar tying machine disclosed herein cuts a wire, clamps the cut wire, and twists the wire. In the reinforcing bar binding machine, the cut wire is elastically clamped by the first clamping member and the second clamping member movable with respect to the first clamping member.

Yet another rebar tying machine disclosed herein cuts a wire, clamps the cut wire, and twists the wire. In the reinforcing bar binding machine, the cut wire is sandwiched by a first sandwiching member capable of guiding the wire and a second sandwiching member movable with respect to the first sandwiching member.

(Example)
A reinforcing bar binding machine 2 according to an embodiment will be described with reference to the drawings. The reinforcing bar binding machine 2 shown in FIG. 1 is an electric tool for binding a plurality of reinforcing bars R with a wire W.

The reinforcing bar binding machine 2 includes a binding machine body 4, a grip 6 provided at a lower portion of the binding machine body 4, and a battery mounting portion 8 provided at a lower portion of the grip 6. A trigger 7 is provided on the front upper portion of the grip 6. A battery B is removably attached to the lower portion of the battery attachment portion 8 via a terminal 9 (see FIGS. 34 to 37).

The reinforcing bar binding machine 2 includes a housing 3. The housing 3 includes a right outer housing 12, a left outer housing 14, and an inner housing 16. In the right outer housing 12, the right half surface of the binding machine body 4, the right half surface of the grip 6, and the right half surface of the battery mounting portion 8 are integrally formed. In the left outer housing 14, the left half surface of the binding machine body 4, the left half surface of the grip 6, and the left half surface of the battery mounting portion 8 are integrally formed. The right outer housing 12 and the left outer housing 14 form the outer surface of the reinforcing bar binding machine 2. The inner housing 16 is formed in a shape that blocks the space between the right outer housing 12 and the left outer housing 14 from the upper part to the middle part inside the binding machine body 4. The right outer housing 12, the left outer housing 14, and the inner housing 16 can be referred to as housing plates, respectively. The interior of the binding machine body 4 is partitioned into a space defined by the left outer housing 14 and the inner housing 16 and a space defined by the right outer housing 12 and the inner housing 16. The space defined by the left outer housing 14 and the inner housing 16 and the space defined by the right outer housing 12 and the inner housing 16 communicate with each other at the lower portion of the binding machine body 4. Further, a reel chamber 19 for accommodating the reel 10 (see FIG. 2) is separately formed behind the binding machine body 4. The reel chamber 19 is defined by the right outer housing 12 in the right direction, and is defined by the inner housing 16 in the left direction, the downward direction, and the front direction. The reel chamber 19 is covered upward by an openable cover 17.

A first operation display unit 18 is provided on the upper surface of the binding machine body 4. The first operation display section 18 is a first operation display provided with a main switch 20 for switching on/off the power of the reinforcing bar binding machine 2 and a main power supply LED 22 for displaying the on/off state of the power of the reinforcing bar binding machine 2. A board 21 (see FIGS. 14, 34, and 35) and a first switch plate 23 that covers the main switch 20 and the main power supply LED 22 of the first operation display board 21 are provided. A second operation display unit 24 is provided on the front upper surface of the battery mounting unit 8. The second operation display section 24 is provided with a second operation display board 25 provided with a setting button 26 for setting the amount of wire W to be sent out, a twisting strength, etc., and a display section 28 for displaying the contents set by the setting button 26. 34 to 37), and a second switch plate 27 that covers the setting button 26 and the display unit 28 of the second operation display board 25. The terminal 9, the trigger 7, the first operation display board 21, and the second operation display board 25 to which the battery B is connected are connected to a control board 180 described later.

The binding machine body 4 mainly includes the accommodating mechanism 30, the feeding mechanism 32, the guide mechanism 34, the brake mechanism 36, the control board 180, and the cutting and sandwiching mechanism 38 shown in FIG. A twisting mechanism 40 shown in FIG. 14 is provided. 2, the right outer housing 12, the cover 17, the wiring inside the reinforcing bar binding machine 2 and the like are omitted for the sake of clarity. In FIG. 13, for clarity of illustration, the wiring inside the reinforcing bar binding machine 2 is omitted. Further, in FIG. 14, for clarity of illustration, the left outer housing 14, a part of wiring inside the reinforcing bar binding machine 2, and the like are omitted. The control board 180 is arranged in the lower central part of the binding machine body 4 so as to straddle the inner housing 16. A part of the control board 180 is disposed on one side when viewed from the inner housing 16 (right outer housing 12 side), and another part of the control board 180 is viewed on the other side when viewed from the inner housing 16 ( It is arranged on the left outer housing 14 side).

As shown in FIG. 2, the accommodation mechanism 30 detachably holds the reel 10 around which the wire W is wound. The reel 10 is rotatably supported by the accommodation mechanism 30 in the reel chamber 19.

The housing mechanism 30 includes a fixed bearing 194 shown in FIG. 3, a reel rotation detection mechanism 196 shown in FIG. 4, a movable bearing 198 shown in FIG. 5, a support member 200, a torsion spring 202, and a slide switch 204. There is. In FIG. 3, the right outer housing 12, the cover 17, the reel 10 and the like are omitted for clarity. Further, in FIG. 4, the left outer housing 14, wiring inside the reinforcing bar binding machine 2, and the like are omitted for the sake of clarity.

As shown in FIG. 3, the fixed bearing 194 is arranged in the binding machine body 4 in a space defined by the inner housing 16 and the right outer housing 12 (that is, a space in which the reel 10 is housed). The fixed bearing 194 is fixed to the inner housing 16. The fixed bearing 194 has a cylindrical outer shape. As shown in FIGS. 7 and 8, a cylindrical bearing groove 10b is formed in the center of the surface of the reel 10 that faces the fixed bearing 194. The fixed bearing 194 engages with the bearing groove 10b of the reel 10 and rotatably supports the reel 10. Further, on the surface of the reel 10 facing the fixed bearing 194, the rotation detection convex portions 10d are formed at predetermined angular intervals in the radial direction.

As shown in FIG. 4, in the binding machine body 4, the reel rotation detection mechanism 196 is provided in a space defined by the inner housing 16 and the left outer housing 14 (that is, a space different from the space in which the reel 10 is housed). Will be placed. The reel rotation detection mechanism 196 includes a rotation detection lever 206, a torsion spring 208, and a magnetic sensor 210. The magnetic sensor 210 is connected to the control board 180 by wiring (not shown). A detection signal from the magnetic sensor 210 is input to the control board 180. The rotation detection lever 206 includes a contact arm 206a and a magnetic arm 206b. The rotation detection lever 206 is swingably supported by the inner housing 16 via a swing shaft 206c. The contact arm 206a passes through the rotation detecting hole 212 formed in the inner housing 16 and projects to a position where it interferes with the rotation detecting convex portion 10d of the reel 10. A permanent magnet 214 is provided on the magnetic arm 206b. The torsion spring 208 urges the rotation detection lever 206 in a direction in which the contact arm 206a projects from the rotation detection hole 212 toward the reel 10. In a state where the rotation detecting convex portion 10d of the reel 10 does not interfere with the contact arm 206a, the contact arm 206a projects from the rotation detecting hole 212 by the urging force of the torsion spring 208, and the permanent magnet 214 of the magnetic arm 206b operates in the magnetic sensor 210. It is placed in a position close to. When the rotation detecting convex portion 10d of the reel 10 interferes with the contact arm 206a, the contact arm 206a is pushed out from the rotation detecting hole 212, the rotation detecting lever 206 swings, and the permanent magnet 214 of the magnetic arm 206b becomes magnetic. It is arranged at a position away from the sensor 210. When the reel 10 accommodated in the accommodating mechanism 30 rotates, the rotation detection convex portion 10d and the contact arm 206a are repeatedly brought into contact with and separated from the magnetic sensor 210 at a cycle corresponding to the rotation speed of the reel 10. Changes. The reinforcing bar binding machine 2 can detect the rotation of the reel 10 housed in the housing mechanism 30 based on the detection signal of the magnetic sensor 210.

As shown in FIG. 5, the movable bearing 198, the support member 200, the torsion spring 202, and the slide switch 204 are provided on the outer surface of the right outer housing 12. The right outer housing 12 is provided with a through hole 12a through which the movable bearing 198 can pass. As shown in FIGS. 7 to 10, the movable bearing 198 has a tapered shape in which the cross-sectional area becomes smaller toward the tip. 9 and 10, only the movable bearing 198, the support member 200, the torsion spring 202, the slide switch 204, and the reel 10 are shown for the sake of clarity. The movable bearing 198 of this embodiment is formed in a truncated cone shape. A cylindrical bearing groove 10c is formed in the center of the surface of the reel 10 that faces the movable bearing 198. The movable bearing 198 rotatably supports the reel 10 by engaging with the edge of the bearing groove 10c of the reel 10.

As shown in FIGS. 5, 6, 9, and 10, the support member 200 supports the movable bearing 198 at its tip. The root of the support member 200 is swingably supported by the right outer housing 12 via a swing shaft 200a. The support member 200 is attached by the torsion spring 202 in a direction in which the movable bearing 198 is brought closer to the fixed bearing 194 (which corresponds to a direction in which the movable bearing 198 is brought closer to the bearing groove 10c of the reel 10 when the reel 10 is accommodated). It is energized. Hereinafter, a state in which the support member 200 moves in a direction in which the movable bearing 198 approaches the fixed bearing 194 is referred to as a closed state of the support member 200, and a direction in which the movable bearing 198 moves away from the fixed bearing 194 (when the reel 10 is accommodated The state in which the support member 200 is moved in the state in which the movable bearing 198 moves away from the bearing groove 10c of the reel 10) is called the state in which the support member 200 is open.

The slide switch 204 is provided on the outer surface of the right outer housing 12 so as to be slidable in the front-rear direction. The slide switch 204 is slidable between a free position that allows the support member 200 to freely open and close, and an open position that forces the support member 200 to open. The slide switch 204 can be operated by the user. The slide switch 204 is normally in the free position. When the slide switch 204 slides from the free position to the open position, the rib 204a of the slide switch 204 enters between the support member 200 and the right outer housing 12, and the support member 200 is pushed open. The support member 200 maintains the open state while the slide switch 204 is in the open position. When the slide switch 204 slides from the open position to the free position, the rib 204a of the slide switch 204 comes out from between the support member 200 and the right outer housing 12, and the support member 200 is closed by the urging force of the torsion spring 202.

When attaching the reel 10 to the reinforcing bar binding machine 2, the user inserts the reel 10 into the space between the fixed bearing 194 and the movable bearing 198. At this time, the outer edge of the reel 10 contacts the tapered surface of the movable bearing 198, and the support member 200 is pushed open together with the movable bearing 198 as the reel 10 is inserted. When the fixed bearing 194 is engaged with the bearing groove 10b of the reel 10 in this state, the bearing groove 10c of the reel 10 is aligned with the movable bearing 198, and the tip end of the movable bearing 198 is urged by the urging force of the torsion spring 202. The movable bearing 198 enters the groove 10c and engages with the edge of the bearing groove 10c. As a result, the reel 10 is housed in the housing mechanism 30.

When the reel 10 is attached to the reinforcing bar binding machine 2, the reel 10 is supported by the fixed bearing 194 and the movable bearing 198. As will be described later, when the wire W is pulled out from the reel 10 by the feeding mechanism 32, the reel 10 slides on the fixed bearing 194 and the reel 10 slides on the movable bearing 198, and 10 rotates. The fixed bearing 194 may be rotatable with respect to the inner housing 16 so that the reel 10 can rotate without the reel 10 sliding on the fixed bearing 194, or the movable bearing 198 can be a supporting member. The reel 10 may be rotatable with respect to 200, and the reel 10 may be configured to rotate without the reel 10 sliding on the movable bearing 198.

When removing the reel 10 from the reinforcing bar binding machine 2, the user takes out the reel 10 from between the fixed bearing 194 and the movable bearing 198. At this time, since the tapered surface of the movable bearing 198 is in contact with the edge of the bearing groove 10c of the reel 10, the support member 200 is pushed open together with the movable bearing 198 as the reel 10 is taken out. Thereby, the reel 10 can be taken out from the accommodation mechanism 30. When the reel 10 is completely taken out from the housing mechanism 30, the biasing force of the torsion spring 202 causes the movable bearing 198 and the support member 200 to return to their initial positions.

When removing the reel 10 from the reinforcing bar binding machine 2, the user may forcibly open the support member 200 by sliding the slide switch 204 from the free position to the open position. As a result, the movable bearing 198 is separated from the bearing groove 10c of the reel 10, and the user can smoothly take out the reel 10 from the housing mechanism 30.

As shown in FIGS. 1 and 5, a cover 17 is provided at the rear of the binding machine body 4. The cover 17 is swingably attached to the left outer housing 14 via a swing shaft 17a. The cover 17 is biased in the opening direction by a torsion spring (not shown). As shown in FIG. 5, a rib 17b is provided at the tip of the cover 17. A slide latch 217 is provided at a position corresponding to the rib 17b of the right outer housing 12. The slide latch 217 is operable by the user and is slidable between an engagement position where it engages with the rib 17b and a release position where it disengages from the rib 17b. As shown in FIG. 1, when the cover 17 is closed and the slide latch 217 is slid to the engagement position, the slide latch 217 and the rib 17b are engaged with each other to keep the cover 17 closed. To do. As shown in FIG. 5, when the slide latch 217 is slid to the release position, the engagement between the slide latch 217 and the rib 17b is released, and the cover 17 is opened by the biasing force of the torsion spring.

The cover 17 includes a storage mechanism cover 218 that covers the reel 10 of the storage mechanism 30, and a feed mechanism cover 220 that covers a guide member 42, a driving gear 46, and a driven gear 48 of the feeding mechanism 32, which will be described later. By covering the accommodation mechanism 30 with the accommodation mechanism cover 218, it is possible to prevent the wire W from being loosened and coming off the reel 10, and to prevent water, dust, sand, or the like from entering the accommodation mechanism 30 from the outside. it can. By covering the feed mechanism 32 with the feed mechanism cover 220, it is possible to prevent water, dust, sand, and the like from entering the feed mechanism 32 from the outside.

In the reinforcing bar binding machine 2 of this embodiment, the housing mechanism cover 218 and the feed mechanism cover 220 are integrally formed as the cover 17. Usually, the operation of attaching and detaching the reel 10 performed by the user with the accommodation mechanism cover 218 open and the operation of setting the wire W on the feeding mechanism 32 performed by the user with the feeding mechanism cover 220 open are a series of operations. As done. If the accommodating mechanism cover 218 and the feed mechanism cover 220 are separately formed, the user performs the opening/closing operation of the accommodating mechanism cover 218 and the opening/closing operation of the feed mechanism cover 220 when performing the series of operations described above. It has to be done and requires complicated work. By integrally forming the accommodation mechanism cover 218 and the feed mechanism cover 220 as in the reinforcing bar binding machine 2 of the present embodiment, it is possible to further improve workability when performing the series of operations described above.

The accommodating mechanism cover 218 is formed with a remaining amount confirmation window 222 through which the user can visually recognize the remaining amount of the wire W wound around the reel 10. By providing the remaining amount confirmation window 222, the user can confirm the remaining amount of the wire W even when the cover 17 is closed.

The storage mechanism cover 218 and/or the feed mechanism cover 220 may be formed of a transparent material. When the housing mechanism cover 218 is made of a transparent material, the user can check the remaining amount of the wire W with the cover 17 closed without providing the remaining amount confirmation window 222. When the feed mechanism cover 220 is made of a transparent material, the user can check the state of the feed mechanism 32 with the cover 17 closed.

As shown in FIG. 2, the feed mechanism 32 feeds the wire W supplied from the reel 10 of the housing mechanism 30 to the guide mechanism 34 in front of the binding machine body 4. The feed mechanism 32 includes a guide member 42, a base member 43, a feed motor 44, a driving gear 46, a reduction mechanism 47, a driven gear 48, a release lever 50, a compression spring 52 (see FIG. 11 ), A lever holder 54 (see FIG. 11) and a fixed lever 56 are provided. The feeding mechanism 32 is unitized and attached to the inner housing 16. The guide member 42 includes a tapered through hole 42a having a wide rear end and a narrow front end. The guide member 42 is fixed to the base member 43. The main driving gear 46 and the driven gear 48 are arranged in front of the guide member 42. The driving gear 46 is connected to the feed motor 44 via a reduction mechanism 47, and is rotated by driving the feed motor 44. The feed motor 44 is connected to the control board 180 by wiring (not shown). The control board 180 can control the operation of the feed motor 44. A V-shaped groove 46a extending in the radial direction at the center in the height direction is formed on the side surface of the driving gear 46. As shown in FIG. 11, the driven gear 48 is rotatably supported by the gear arm 50 a of the release lever 50. A V-shaped groove 48a extending in the radial direction at the center in the height direction is formed on the side surface of the driven gear 48. The release lever 50 is a substantially L-shaped member including a gear arm 50a and an operation arm 50b. The release lever 50 is swingably supported by the base member 43 via a swing shaft 50c. The operation arm 50b of the release lever 50 is connected to the spring receiving portion 54a of the lever holder 54 via the compression spring 52. The lever holder 54 is sandwiched and fixed between the inner housing 16 and the left outer housing 14. The compression spring 52 biases the operation arm 50b in a direction away from the spring receiving portion 54a. Normally, the biasing force of the compression spring 52 applies a torque in the direction of bringing the driven gear 48 closer to the driving gear 46 to the release lever 50, and the driven gear 48 is pressed against the driving gear 46. As a result, the side teeth of the driven gear 48 and the side teeth of the driving gear 46 engage with each other, and the wire W is interposed between the V-shaped groove 46a of the driving gear 46 and the V-shaped groove 48a of the driven gear 48. It is pinched. In this state, when the feed motor 44 rotates the main drive gear 46, the driven gear 48 rotates in the opposite direction, and the wire W held between the main drive gear 46 and the driven gear 48 is sent out to the guide mechanism 34 and the reel The wire W is pulled out from the wire 10.

The fixed lever 56 is swingably supported by the lever holder 54 via a swing shaft 56a. The fixed lever 56 is biased by a torsion spring (not shown) in a direction in which it comes into contact with the operation arm 50b of the release lever 50. The fixed lever 56 is formed with a recess 56b that engages with the tip of the operation arm 50b of the release lever 50.

When the user of the reinforcing bar binding machine 2 pushes the operation arm 50b against the urging force of the compression spring 52, the release lever 50 swings around the swing shaft 50c, and the driven gear 48 moves from the driving gear 46. Separate. At this time, the fixed lever 56 swings around the swing shaft 56a, and the tip of the operation arm 50b engages with the recessed portion 56b, so that the operation arm 50b is held in the pushed state. When the wire W extending from the reel 10 is set on the feed mechanism 32, the user pushes the operation arm 50b to separate the driven gear 48 from the driving gear 46, and in this state, the tip of the wire W pulled out from the reel 10. Is arranged between the main driving gear 46 and the driven gear 48 through the through hole 42a of the guide member 42. When the user swings the fixed lever 56 in the direction away from the operation arm 50b, the release lever 50 swings around the swing shaft 50c, and the driven gear 48 engages with the driving gear 46. The wire W is sandwiched between the V-shaped groove 46 a of the driving gear 46 and the V-shaped groove 48 a of the driven gear 48.

As shown in FIGS. 13 and 14, the guide mechanism 34 guides the wire W fed from the feed mechanism 32 in an annular shape around the reinforcing bar R. The guide mechanism 34 includes a guide pipe 58, an upper curl guide 60, and a lower curl guide 62. The guide pipe 58 and the upper curl guide 60 are unitized and are attached to the front of the left outer housing 14 and the inner housing 16. The rear end of the guide pipe 58 is open between the main drive gear 46 and the driven gear 48. The wire W sent from the sending mechanism 32 is sent into the inside of the guide pipe 58. A front end portion of the guide pipe 58 opens toward the inside of the upper curl guide 60. The upper curl guide 60 is provided with a first guide passage 64 for guiding the wire W fed from the guide pipe 58 and a second guide passage 66 for guiding the wire W fed from the lower curl guide 62. ing.

As shown in FIGS. 2 and 11, the upper curl guide 60 includes a right outer plate 264, an inner plate 266, and a left outer plate 268. The inner plate 266 is arranged so as to block between the right outer plate 264 and the left outer plate 268. A first guide passage 64 for guiding the wire W sent from the guide pipe 58 is formed in a space defined by the right outer plate 264 and the inner plate 266, and is partitioned by the inner plate 266 and the left outer plate 268. A second guide passage 66 for guiding the wire W sent from the lower curl guide 62 is formed in the space.

As shown in FIG. 12, the first guide passage 64 is provided with a first guide member 274, a first guide pin 276, a cutter 70, a second guide member 280, and a second guide pin 282. .. Note that the inner plate 266 is not shown in FIG. 12 for the sake of clarity. The first guide member 274 is a metal member, and a wire passage 274a through which the wire W passes is formed therein. An upper guide wall 274b is formed on the upper surface of the wire passage 274a, and a lower guide wall 274c is formed on the lower surface of the wire passage 274a. The upper guide wall 274b and the lower guide wall 274c are formed so as to have a narrower distance from the rear to the front. Further, the front end of the upper guide wall 274b is arranged in front of the front end of the lower guide wall 274c. The front end of the guide pipe 58 is inserted into the rear end of the wire passage 274a. The first guide pin 276 is arranged below the front end of the wire passage 274a. The first guide pin 276 is arranged in front of the front end of the lower guide wall 274c and behind the front end of the upper guide wall 274b. The first guide pin 276 is a member made of metal having high wear resistance such as tungsten, and is rotatably supported by the right outer plate 264 and the inner plate 266. When the tip of the wire W is delivered from the guide pipe 58, the wire W slides in contact with the lower guide wall 274c and the upper guide wall 274b, and the first guide pin 276 and the wire W slide in contact with each other toward the cutter 70. Wire W is guided. After the wire W slides in contact with the first guide pin 276, the wire W slides in contact with the first guide pin 276 and the upper guide wall 274b without sliding in contact with the lower guide wall 274c and is guided toward the cutter 70. To be done.

The cutter 70 includes a fixing member 284 and a swinging member 286. The fixing member 284 is a metal member having a cylindrical outer shape, and a wire passage 284a through which the wire W passes is formed therein. The fixing member 284 is fixed to the right outer plate 264 and the inner plate 266. The swinging member 286 is a metal member formed with a through hole 286 a through which the fixing member 284 penetrates and a cutting piece 286 b for cutting the wire W, and the right outer plate 264 and the inner plate via the fixing member 284. It is swingably supported by 266. The cutting piece 286b includes a push surface 286c that pushes up the wire W when the swing member 286 swings, a cutting portion 286d that cuts the wire W by shearing, and a holding surface that holds the cut end portion of the wire W. It is formed in a shape including 286e. The wire W sent from the first guide member 274 and the first guide pin 276 passes through the wire passage 284 a of the fixing member 284 and is sent to the second guide member 280.

The second guide member 280 is a metal member, and has a guide wall 280a for guiding the wire W, a through hole 280b through which the second guide pin 282 penetrates, and a clamping surface for clamping the cut end of the wire W. 280c is formed. The second guide member 280 is connected to the right outer plate 264 and the inner plate 266 via an elastic pin 288 made of elastic rubber. The second guide pin 282 is a metal member having high wear resistance such as tungsten, and is rotatably supported by the right outer plate 264 and the inner plate 266. The second guide pin 282 is slidable with respect to the second guide member 280, and is accommodated in the through hole 280b so that a part thereof protrudes from the guide wall 280a. When the tip of the wire W is delivered from the cutter 70, the wire W slides on the guide wall 280a and is guided toward the second guide pin 282, and then slides on the second guide pin 282. After the wire W is slidably contacted with the second guide pin 282, the wire W is slidably contacted with the second guide pin 282 without being slidably contacted with the guide wall 280a, and the downward curl guide is attached while the downward curl is applied. It is sent to 62.

As shown in FIG. 14, the lower curl guide 62 is provided with a third guide passage 72 and a guard plate 74. It should be noted that in FIG. 14, for clarity of illustration, illustration of the left outer housing 14, a part of wiring inside the reinforcing bar binding machine 2, and the like are omitted. The third guide passage 72 includes a right guide wall 72a and a left guide wall 72b that guide the wire W sent from the front end of the upper curl guide 60. The guard plates 74 are formed in a shape that extends upward on both sides of the third guide passage 72, prevent the plurality of reinforcing bars R from interfering with the twisting mechanism 40, and allow foreign matter to enter the binding machine body 4. To prevent In addition, the guard plate 74 prevents the wire W from moving wildly when the twisting mechanism 40 twists the wire W wound in an annular shape. The wire W guided by the lower curl guide 62 is sent toward the second guide passage 66 of the upper curl guide 60.

A third guide member 292 is provided in the second guide passage 66 of the upper curl guide 60. The third guide member 292 is a metal member and has an upper guide wall 292a for guiding the wire W formed therein. The second guide passage 66 also includes a left guide wall 268a (see FIG. 1) formed on the left outer plate 268 and a right guide wall 266a formed on the inner plate 266. The wire W sent from the lower curl guide 62 is guided by the upper guide wall 292a, the right guide wall 266a, and the left guide wall 268a, and is sent toward the lower curl guide 62 again.

The lower curl guide 62 is attached to the front of the left outer housing 14 and the inner housing 16. The lower curl guide 62 is swingably supported by the left outer housing 14 and the inner housing 16 via a swing shaft 62a. The lower curl guide 62 can swing between the open state shown in FIG. 15 and the closed state shown in FIG. 15 and 16, the left outer housing 14 and the wiring inside the reinforcing bar binding machine 2 are omitted for clarity. The lower curl guide 62 is biased in a closing direction by a torsion spring 62b. When the reinforcing bar binding machine 2 is used, the lower curl guide 62 is in a closed state. When the wire W is entangled with the twisting mechanism 40 while using the reinforcing bar binding machine 2, the user can open the lower curl guide 62 and remove the wire W entangled with the twisting mechanism 40. ..

An open/close detection mechanism 78 for detecting the open/closed state of the lower curl guide 62 is provided in the lower front portion inside the binding machine body 4. The open/close detection mechanism 78 is attached to the left outer housing 14. The open/close detection mechanism 78 includes an open/close detection lever 80, a torsion spring 82, and a sensor substrate 84. The sensor board 84 is connected to the control board 180 by wiring (not shown). The open/close detection lever 80 includes a contact piece 80a and a detection piece 80b. The open/close detection lever 80 is swingably supported by the left outer housing 14 via a swing shaft 80c. As shown in FIG. 17, the contact piece 80a passes through an opening/closing detection opening 80d formed in the left outer housing 14 and projects to the outside of the binding machine body 4. Note that in FIG. 17, the upper curl guide 60 and the lower curl guide 62 are omitted for clarity. The detection piece 80b shown in FIGS. 15 and 16 is provided with a permanent magnet (not shown). The sensor substrate 84 is fixed to the left outer housing 14. A magnetic sensor (not shown) such as a Hall element is provided on the surface of the sensor substrate 84 facing the detection piece 80b. As shown in FIG. 15, when the lower curl guide 62 is open, the open/close detection lever 80 swings due to the urging force of the torsion spring 82, and the permanent magnet of the detection piece 80b is disengaged from the magnetic sensor of the sensor substrate 84. Are placed in the When the lower curl guide 62 is closed from this state, the contact piece 62c provided on the rear side of the lower curl guide 62 contacts the contact piece 80a of the opening/closing detection lever 80 to contact the opening/closing detection lever 80. When the piece 80a is pushed down, the open/close detection lever 80 swings, and the permanent magnet of the detection piece 80b is arranged at a position facing the magnetic sensor of the sensor substrate 84. The signal detected by the magnetic sensor of the sensor board 84 is input to the control board 180. The control board 180 can determine the open/closed state of the lower curl guide 62 based on the detection signal of the magnetic sensor of the sensor board 84.

As shown in FIG. 17, the lateral width of the opening/closing detection opening 80d formed in the left outer housing 14 is substantially equal to the lateral width of the contact piece 80a of the opening/closing detection lever 80. With such a configuration, foreign matter can be prevented from entering the inside of the binding machine body 4 through the opening/closing detection opening 80d. Further, the vertical width of the opening/closing detection opening 80d formed in the left outer housing 14 is substantially equal to the movable range of the contact piece 80a. With such a configuration, foreign matter can be prevented from entering the inside of the binding machine body 4 through the opening/closing detection opening 80d.

As shown in FIG. 1, the upper curl guide 60 sends out the wire W from the front upper side to the lower side of the plurality of reinforcing bars R, and the lower curl guide 62 transfers the wire W sent from the upper curl guide 60 to the rear side of the plurality of reinforcing bars R. Send from below to above. As a result, the wire W fed from the feeding mechanism 32 is wound around the plurality of reinforcing bars R in an annular shape. When the feed mechanism 32 feeds the wire W by the feed amount of the wire W set by the user, it stops the feed motor 44 and stops the feed of the wire W.

The brake mechanism 36 shown in FIG. 2 stops the rotation of the reel 10 in conjunction with the feeding mechanism 32 stopping the feeding of the wire W. The brake mechanism 36 includes a solenoid 86, a link 88 (see FIGS. 18 and 19), a torsion spring 90 (see FIGS. 18 and 19), and a brake arm 92. The solenoid 86 of the brake mechanism 36 is connected to the control board 180 by wiring (not shown). The control board 180 can control the operation of the brake mechanism 36. The brake mechanism 36 is unitized and attached to the inner housing 16. Engaging portions 10a with which the brake arms 92 are engaged are formed on the reel 10 in the radial direction at predetermined angular intervals. As shown in FIG. 18, when the solenoid 86 is not energized, the brake arm 92 is separated from the engaging portion 10 a of the reel 10 by the biasing force of the torsion spring 90. As shown in FIG. 19, when the solenoid 86 is energized, the link 88 causes the brake arm 92 to swing toward the reel 10, and the brake arm 92 engages with the engaging portion 10 a of the reel 10. When the feed mechanism 32 feeds the wire W, the brake mechanism 36 does not energize the solenoid 86, but separates the brake arm 92 from the engaging portion 10 a of the reel 10. Thereby, the reel 10 can freely rotate, and the feeding mechanism 32 can pull out the wire W from the reel 10. The brake mechanism 36 energizes the solenoid 86 to engage the brake arm 92 with the engaging portion 10 a of the reel 10 when the feeding mechanism 32 stops feeding the wire W. As a result, the rotation of the reel 10 is prohibited. Accordingly, even after the feeding mechanism 32 stops feeding the wire W, the reel 10 can be prevented from continuing to rotate due to inertia, and the wire W can be prevented from loosening between the reel 10 and the feeding mechanism 32.

As shown in FIG. 2, the brake mechanism 36 is housed inside the binding machine body 4 and in a brake chamber 37 defined by the right outer housing 12 and the inner housing 16. As shown in FIG. 20, the inner housing 16 is formed with a brake opening 92a through which the tip of the brake arm 92 passes. When engaging the brake arm 92 with the engaging portion 10a of the reel 10, only the tip of the brake arm 92 passes through the brake opening 92a via the brake opening 92a, and the engaging portion 10a of the reel 10 is engaged. Engage. The width of the brake opening 92a in the left-right direction is substantially equal to the width of the tip of the brake arm 92. The width of the brake opening 92a in the front-rear direction is substantially equal to the movable range of the tip of the brake arm 92. With such a configuration, it is possible to prevent foreign matter from entering the inside of the binding machine body 4 through the brake opening 92a. Further, the brake chamber 37 communicates with the outside of the brake chamber 37 only through the brake opening 92a. With such a configuration, it is possible to prevent foreign matter from entering the inside of the brake chamber 37. It is possible to prevent the brake mechanism 36 and other mechanisms existing around the brake mechanism 36 from being affected by foreign matter.

As shown in FIG. 21, the cutting and holding mechanism 38 cuts the wire W and holds the cut end of the wire W while the wire W is wound around the reinforcing bar R. Note that the inner plate 266 is not shown in FIG. 21 for the sake of clarity. The cutting and sandwiching mechanism 38 includes a cutter 70, a second guide member 280, and a link 94. The link 94 causes the swinging member 286 of the cutter 70 to swing around the fixing member 284 in cooperation with the twisting mechanism 40 described later. From the state shown in FIG. 12, the swing member 286 swings with respect to the fixing member 284, whereby the wire W is pushed up by the push upper surface 286c of the cutting piece 286b, and at the front end of the wire passage 284a of the fixing member 284, The wire W is cut by shearing by the cutting portion 286d of the cutting piece 286b of the swing member 286. Then, as shown in FIG. 21, the cut end of the wire W is clamped by the clamping surface 286e of the cutting piece 286b and the clamping surface 280c of the second guide member 280. At this time, since the second guide member 280 is connected to the right outer plate 264 and the inner plate 266 by the elastic pin 288, the cut end of the wire W is separated by the swing member 286 and the second guide member 280. It is elastically pinched. This makes it possible to reliably hold the cut end of the wire W regardless of the diameter of the wire W. Instead of connecting the second guide member 280 to the right outer plate 264 and the inner plate 266 by the elastic pin 288, for example, a cushion member made of elastic rubber or the like connected to the right outer plate 264 or the inner plate 266 is used as the second guide. When the cut end of the wire W is sandwiched by the sandwiching surface 286e of the cutting piece 286b and the sandwiching surface 280c of the second guide member 280 by being arranged on the front side of the member 280 (the side opposite to the sandwiching surface 280c). In addition, the cushion member may be elastically pinched by being elastically compressed and deformed. Alternatively, the second guide member 280 is connected to the right outer plate 264 or the inner plate 266 via a tension spring or a torsion spring, and the cut end of the wire W is guided to the holding surface 286e of the cutting piece 286b and the second guide. When the holding surface 280c of the member 280 holds the member 280, the tension spring or the torsion spring may be elastically deformed to elastically hold the member 280.

The twisting mechanism 40 shown in FIG. 14 twists the wire W wound around the plurality of reinforcing bars R to bind the plurality of reinforcing bars R with the wires W. As shown in FIG. 22, the torsion mechanism 40 includes a torsion motor 96, a first reduction gear mechanism 98, a second reduction gear mechanism 100, and a gripping mechanism 102. The torsion motor 96 is connected to the control board 180 by wiring (not shown). The control board 180 can control the operation of the torsion motor 96. The twist mechanism 40 is unitized and attached to the left outer housing 14.

As shown in FIG. 23, the first reduction gear mechanism 98 is a planetary gear reduction mechanism. The first reduction gear mechanism 98 can also be referred to as a coaxial reduction gear mechanism. The first reduction gear mechanism 98 includes a gear bracket 104, an internal gear 106, a planetary gear 108, and a sun gear 110. The gear bracket 104 is fixed to the main bracket 112 (see FIG. 22). The internal gear 106 is fixed to the gear bracket 104. The sun gear 110 is connected to the output shaft of the torsion motor 96. The planetary gear 108 is connected to the relay shaft 114 (see FIG. 24) via a planetary carrier (not shown). The first reduction mechanism 98 reduces the rotation of the torsion motor 96 and transmits it to the relay shaft 114.

As shown in FIG. 24, the second reduction gear mechanism 100 is a spur gear reduction mechanism. The second reduction mechanism 100 can also be referred to as a parallel axis reduction mechanism. The second reduction gear mechanism 100 includes a first spur gear 116 and a second spur gear 118. The first spur gear 116 is connected to the relay shaft 114. The second spur gear 118 is connected to the screw shaft 120. The second reduction mechanism 100 reduces the rotation of the relay shaft 114 and transmits it to the screw shaft 120.

As shown in FIGS. 25-27, the gripping mechanism 102 includes a screw shaft 120, an inner sleeve 122 (see FIGS. 29-32), an outer sleeve 124, a push plate 126, and a push sleeve 128 (FIG. 29-). 32), a support sleeve 130, a tip shaft 132, a right hook 134, and a left hook 136.

As shown in FIG. 26, the screw shaft 120 has a large diameter portion 120a at the rear and a small diameter portion 120b at the front. A spiral ball groove 120c is formed on the outer surface of the large diameter portion 120a. A bumper 138 made of an elastic material having an annular shape is provided at a step portion between the large diameter portion 120a and the small diameter portion 120b. A compression spring 140 is provided around the small diameter portion 120b. The compression spring 140 urges the tip shaft 132 in a direction away from the bumper 138. Furthermore, an engagement groove 120d (see FIGS. 29 to 32) with which the stopper 142 of the tip shaft 132 is engaged is formed at the tip of the small-diameter portion 120b.

The inner sleeve 122 shown in FIGS. 29 to 32 is a cylindrical member into which the screw shaft 120 is inserted. A ball hole (not shown) into which the ball 144 shown in FIG. 26 fits is formed in the inner sleeve 122. The screw shaft 120 and the inner sleeve 122 are connected via a ball 144 fitted between the ball groove 120c and the ball hole. That is, the screw shaft 120 and the inner sleeve 122 are connected via the ball screw. In a range where the ball groove 120c is formed, when the screw shaft 120 rotates relative to the inner sleeve 122, the inner sleeve 122 moves in the front-rear direction relative to the screw shaft 120.

As shown in FIG. 25, the outer sleeve 124 is a cylindrical member into which the inner sleeve 122 and the tip shaft 132 are inserted. The outer sleeve 124 is fixed to the inner sleeve 122 via a set screw 146.

The right hook 134 and the left hook 136 are gripping members that grip the wire W. As shown in FIG. 25, the left hook 136 is swingably supported by the outer sleeve 124 via a swing shaft 136a. As shown in FIG. 26, the left hook 136 is formed with a cam groove 136b. Similarly, the right hook 134 is swingably supported by the outer sleeve 124 via a swing shaft 134a. A cam groove 134b (see FIG. 27) is formed in the right hook 134. As shown in FIG. 25, the tip shaft 132 is slidably inserted in the outer sleeve 124. The tip shaft 132 is provided with a cam pin 148 that engages with the cam groove 134b of the right hook 134 and the cam groove 136b of the left hook 136. As shown in FIG. 27, when the tip shaft 132 moves forward relative to the outer sleeve 124, the right hook 134 and the left hook 136 swing in the direction in which the cam pin 148 comes out of the cam groove 134b and the cam groove 136b, and the right hook 134 The hook 134 and the left hook 136 are open. When the right hook 134 and the left hook 136 are fully opened, the stopper portion 134c formed on the right hook 134 and the stopper portion 136c formed on the left hook 136 are in contact with each other, and the right hook 134 and the left hook 134 are left. The hook 136 can no longer be opened. As a result, the tip shaft 132 is prohibited from further advancing with respect to the outer sleeve 124. When the tip shaft 132 retracts relative to the outer sleeve 124, the right hook 134 and the left hook 136 swing so that the cam pin 148 enters the cam groove 134b and the cam groove 136b, and the right hook 134 and the left hook 136 are separated from each other. It will be in a closed state. As shown in FIGS. 29 to 32, the tip shaft 132 is provided with a stopper 142 that engages with the engagement groove 120d of the screw shaft 120. The tip shaft 132 is movable relative to the screw shaft 120 in the front-rear direction within a range in which the stopper 142 engages with the front end and the rear end of the engagement groove 120d.

As shown in FIGS. 29 to 32, the push sleeve 128 is a cylindrical member that covers the periphery of the inner sleeve 122. The push sleeve 128 is sandwiched between a rib 122 a formed at the rear end of the inner sleeve 122 and the outer sleeve 124. The push sleeve 128 is rotatable with respect to the inner sleeve 122. The push plate 126 is sandwiched between a rib 128 a formed on the push sleeve 128 and the outer sleeve 124. As shown in FIG. 22, the push plate 126 is prohibited from rotating by a pin 150 extending from the main bracket 112 and is guided in the front-rear direction. The push plate 126 moves in the front-rear direction together with the outer sleeve 124. When the push plate 126 moves forward, the link 94 of the cutting and sandwiching mechanism 38 shown in FIGS. 12 and 14 is driven so that the cutter 70 cuts the wire W and also sandwiches the cut end portion of the wire W. As shown in FIG. 21, since the cutting and clamping mechanism 38 clamps the cut end portion of the wire W, the cut end portion of the wire W is prevented from moving around while the wire W is twisted. be able to. After that, when the push plate 126 moves rearward, the link 94 of the cutting and clamping mechanism 38 is driven in the opposite direction, the cutting and clamping mechanism 38 releases the cut end of the wire W, and the cutter 70 is in the initial posture. Return to. Further, as shown in FIG. 22, the push plate 126 is provided with a permanent magnet 152. A magnetic sensor 154 is provided on the main bracket 112 corresponding to the permanent magnet 152. The magnetic sensor 154 is connected to the control board 180 by wiring (not shown). The signal detected by the magnetic sensor 154 is input to the control board 180. The control board 180 can determine whether the push plate 126 is in the initial position based on the detection result of the magnetic sensor 154.

As shown in FIG. 25, the support sleeve 130 is a cylindrical member that covers the outer sleeve 124. The support sleeve 130 is rotatable with respect to the outer sleeve 124 and movable in the front-rear direction. The support sleeve 130 is supported by the left outer housing 14 and the inner housing 16 so as to be rotatable and immovable in the front-rear direction.

Short fins 124a and long fins 124b extending in the front-rear direction are formed on the rear outer surface of the outer sleeve 124. The short fins 124a and the long fins 124b cooperate with the rotation limiting mechanism 156 (see FIG. 22) to allow or prohibit the rotation of the outer sleeve 124. In the reinforcing bar binding machine 2 of the present embodiment, the two long fins 124b are arranged at an interval of 180 degrees on the outer surface of the outer sleeve 124, and the six short fins 124a are 45 degrees apart between the long fins 124b. It is arranged at intervals.

As shown in FIG. 28, the rotation limiting mechanism 156 includes a base member 158, an upper arm member 160, and a lower arm member 162. The base member 158 is fixed to the inner housing 16. The upper arm member 160 is swingably supported by the base member 158 via the swing shaft 160a. The upper arm member 160 includes a restriction piece 160b. The upper arm member 160 is biased by a torsion spring 160c in a direction to open the restriction piece 160b to the outside. When the screw shaft 120 rotates in the right-hand screw direction (when the twisting mechanism 40 finishes twisting the wire W and returns to the initial posture), the short fins 124a and the long fins 124b push the upper arm member 160, so that the upper arm is pushed. The member 160 does not prohibit the outer sleeve 124 from rotating. When the outer sleeve 124 rotates in the left-handed thread direction (when the twisting mechanism 40 grips and twists the wire W), the short fins 124a and the long fins 124b come into contact with the end surfaces of the restricting pieces 160b, so that the upper arm member 160 moves. The rotation of the outer sleeve 124 is prohibited. The lower arm member 162 is swingably supported by the base member 158 via a swing shaft 162a. The lower arm member 162 includes a restriction piece 162b. The lower arm member 162 is biased by a torsion spring 162c in a direction to open the restriction piece 162b to the outside. When the outer sleeve 124 rotates in the left-hand thread direction (when the twisting mechanism 40 grips and twists the wire W), the short fins 124a and the long fins 124b push the lower arm member 162, so that the lower arm member 162 moves. The rotation of the outer sleeve 124 is not prohibited. When the outer sleeve 124 rotates in the direction of the right-hand screw (when the twisting mechanism 40 finishes twisting the wire W and returns to the initial posture), the short fins 124a and the long fins 124b come into contact with the end surface of the restriction piece 162b. The lower arm member 162 prohibits rotation of the outer sleeve 124. As shown in FIG. 28, the rear end of the restriction piece 160b of the upper arm member 160 is disposed rearward of the rear end of the restriction piece 162b of the lower arm member 162. Further, the front end of the restriction piece 162b of the lower arm member 162 is arranged in front of the front end of the restriction piece 160b of the upper arm member 160.

29 to 32 show how the gripping mechanism 102 operates. As shown in FIG. 29, in the initial posture before the torsion motor 96 is driven, most of the screw shaft 120 is arranged inside the inner sleeve 122, and the long fins 124b of the outer sleeve 124 are arranged so that the rotation limiting mechanism. It is sandwiched between the upper arm member 160 and the lower arm member 162 of 156. Further, the tip shaft 132 is in a state of being advanced with respect to the outer sleeve 124, and the right hook 134 and the left hook 136 are in a state of being maximally opened.

From this state, when the screw shaft 120 is rotated in the left-hand screw direction by driving the torsion motor 96, the long fins 124b are in contact with the restriction pieces 160b of the upper arm member 160, and the rotation of the outer sleeve 124 is prohibited. Therefore, as shown in FIG. 30, the inner sleeve 122 and the outer sleeve 124 move forward with respect to the screw shaft 120. As the outer sleeve 124 advances, the tip shaft 132 also advances with respect to the screw shaft 120 by the biasing force of the compression spring 140. The tip shaft 132 can move forward with respect to the screw shaft 120 until the stopper 142 contacts the front end of the engagement groove 120d.

When the screw shaft 120 further rotates in the left-hand screw direction from this state, the outer sleeve 124 further advances with respect to the screw shaft 120, as shown in FIG. However, since the stopper 142 is in contact with the front end of the engagement groove 120d, the tip shaft 132 cannot advance further with respect to the screw shaft 120. Therefore, the tip shaft 132 is relatively drawn into the outer sleeve 124, and the right hook 134 and the left hook 136 are closed.

From this state, when the screw shaft 120 further rotates in the left-hand screw direction, the outer sleeve 124 further advances with respect to the screw shaft 120. As shown in FIG. 32, the tip shaft 132 is completely drawn into the outer sleeve 124, and the right hook 134 and the left hook 136 are completely closed. As a result, the wire W is gripped by the right hook 134 and the left hook 136.

At a timing slightly before the right hook 134 and the left hook 136 are completely closed, in the rotation limiting mechanism 156, the long fin 124b and the upper arm member 160 do not come into contact with each other. Therefore, thereafter, as the screw shaft 120 rotates, the outer sleeve 124 rotates, and the right hook 134 and the left hook 136 also rotate. As a result, the wire W gripped by the right hook 134 and the left hook 136 is twisted. The twisting mechanism 40 rotates the twisting motor 96 in the opposite direction when the wire W is twisted to a predetermined twisting strength.

When the torsion motor 96 is rotated in the reverse direction, that is, in the right-handed screw direction, the screw shaft 120 also rotates in the right-handed screw direction. At this time, when the outer sleeve 124 slightly rotates, the short fins 124a or the long fins 124b come into contact with the restricting pieces 162b of the lower arm member 162 to prohibit the outer sleeve 124 from rotating, so that the right hook 134 and The outer sleeve 124 retracts relative to the screw shaft 120 while maintaining a rotation angle substantially the same as the rotation angle at which the left hook 136 has finished twisting the wire W. At this time, since the tip shaft 132 is maintained in the advanced state with respect to the screw shaft 120 by the urging force of the compression spring 140, the tip shaft 132 is relatively pulled out from the outer sleeve 124, and the right hook 134 and the left hook 134. 136 begins to open.

After that, when the screw shaft 120 further rotates in the right-hand screw direction, the outer sleeve 124 further retracts with respect to the screw shaft 120, and the tip shaft 132 is completely pulled out from the outer sleeve 124, and the right hook 134 and the left hook 136. Is completely open. In this state, thereafter, the tip end shaft 132 retracts relative to the screw shaft 120 together with the outer sleeve 124.

Then, when the screw shaft 120 further rotates in the right-handed screw direction, the outer sleeve 124 and the tip shaft 132 further retract with respect to the screw shaft 120, and most of the screw shaft 120 is disposed inside the inner sleeve 122. At this time, when it is the short fin 124a that is in contact with the lower arm member 162 of the rotation limiting mechanism 156, the short fin 124a is not in contact with the lower arm member 162, and the rotation of the outer sleeve 124 is prevented. Permissible. At this time, the compression spring 140 and the bumper 138 are strongly compressed, and a strong biasing force acts from the compression spring 140 and the bumper 138. As a result, a strong frictional force acts between the ball groove 120c of the screw shaft 120 and the ball 144 fitted in the ball hole of the inner sleeve 122, so that when the screw shaft 120 rotates, the outer sleeve 124 moves to the screw shaft 120. It rotates with the screw shaft 120 without moving backward. When the outer sleeve 124 rotates and the long fins 124b come into contact with the lower arm member 162 of the rotation limiting mechanism 156, the rotation of the outer sleeve 124 is prohibited again, and the outer sleeve 124 further retracts. When the magnetic sensor 154 detects that the outer sleeve 124 has completely retracted, the torsion mechanism 40 stops the rotation of the torsion motor 96. As a result, the twisting mechanism 40 returns to the initial posture.

As shown in FIG. 1, when the user arranges the reinforcing bar binding machine 2 so that the plurality of reinforcing bars R are located between the upper curl guide 60 and the lower curl guide 62, and pulls the trigger 7, the reinforcing bar is operated. The binding machine 2 winds the wire W around the rebar R by the feed mechanism 32, the guide mechanism 34, and the brake mechanism 36, and cuts the wire W by the cutting and sandwiching mechanism 38 and the twisting mechanism 40 to rebar R. A series of operations for twisting the wire W wound around is executed.

Below, the assembling work of the reinforcing bar binding machine 2 will be described with reference to FIGS. 33 to 37. 33 to 37, wiring and the like are omitted for clarity. First, the cover 17 is assembled to the left outer housing 14 shown in FIG. Then, as shown in FIG. 34, in the left outer housing 14, the trigger 7, the terminal 9, the first operation display board 21 and the first switch plate 23 of the first operation display section 18, and the second operation display section 24 of the second operation display section 24. The operation display board 25, the second switch plate 27, the guide mechanism 34, the cutting and sandwiching mechanism 38, the twisting mechanism 40, the open/close detection mechanism 78, the control board 180 and the like are assembled. On the inner surface of the left outer housing 14, that is, on the surface facing the inner housing 16, a torsion motor holding portion 164 holding the torsion motor 96, a first reduction mechanism holding portion 166 holding the first reduction mechanism 98, and a support sleeve. A torsion mechanism holding portion 170 including a support sleeve holding portion 168 that holds 130 is formed, and the torsion mechanism 40 is held by the torsion mechanism holding portion 170. Further, the guide mechanism 34, the cutting and sandwiching mechanism 38, and the open/close detection mechanism 78 are fixed to the left outer housing 14 via screws 182. At this time, wiring work between the control board 180 and each of the trigger 7, the terminal 9, the first operation display board 21, the second operation display board 25, the twist mechanism 40, and the open/close detection mechanism 78 is also performed. .. After that, as shown in FIG. 35, the inner housing 16 is attached to the left outer housing 14 with the screw 184 and the pan head screw 185. Then, as shown in FIG. 36, the housing mechanism 30, the feed mechanism 32, and the brake mechanism 36 are assembled to the inner housing 16, respectively. On a surface of the inner housing 16 facing the right outer housing 12, a feed mechanism holding portion 174 including a feed motor holding portion 172 holding the feed motor 44 and a brake mechanism holding portion including a solenoid holding portion 176 holding the solenoid 86. 178 is formed, the feed mechanism 32 is held by the feed mechanism holding portion 174, and the brake mechanism 36 is held by the brake mechanism holding portion 178. The housing mechanism 30 and the brake mechanism 36 are fixed to the inner housing 16 via screws 184. At this time, wiring work between the feed mechanism 32 and the brake mechanism 36 and the control board 180 is also performed. Then, as shown in FIG. 37, the right outer housing 12 is assembled to the left outer housing 14 and the inner housing 16 with the screw 186, whereby the reinforcing bar binding machine 2 can be assembled. As described above, when the reinforcing bar binding machine 2 is assembled, the twisting mechanism 40, the cutting and clamping mechanism 38, the guide mechanism 34, and the feeding mechanism can be operated by operating the reinforcing bar binding machine 2 from one direction without turning the reinforcing bar binding machine 2 over. Each component such as 32 and the brake mechanism 36 can be assembled. Assembly work can be easily performed.

In this embodiment, the control board 180 is arranged so as to straddle the inner housing 16, and a part of the control board 180 is arranged on one side (the right outer housing 12 side) when viewed from the inner housing 16. Another part of the substrate 180 is arranged on the other side (on the left outer housing 14 side) when viewed from the inner housing 16. Therefore, the wire connection between the feed motor 44 of the feed mechanism 32 and the control board 180 and the wire connection between the solenoid 86 of the brake mechanism 36 are on one side (on the right outer housing 12 side) when viewed from the inner housing 16. Can be done in space. Further, the connection between the torsion motor 96 of the torsion mechanism 40 and the control board 180 can be performed in the space on the other side (left outer housing 14 side) when viewed from the inner housing 16. With such a configuration, it is not necessary to provide the inner housing 16 with holes or connection terminals for passing wires between the feed motor 44, the solenoid 86, and the torsion motor 96 and the control board 180. Further, since it is not necessary to pass wiring between one side and the other side of the inner housing 16, the workability of assembling the reinforcing bar binding machine 2 can be improved. The control board 180 includes a feed motor control board for controlling the feed motor 44, a solenoid control board for controlling the solenoid 86, and a torsion motor control board for controlling the torsion motor 96. They may be provided separately. In this case, a part of each of the feed motor control board, the solenoid control board, and the torsion motor control board is arranged on one side when viewed from the inner housing 16 (on the right outer housing 12 side), By configuring the other part to be arranged on the other side (on the left outer housing 14 side) when viewed from the inner housing 16, the same effect as described above can be obtained.

As described above, the reinforcing bar binding machine 2 of the present embodiment binds the plurality of reinforcing bars R with the wires W. The reinforcing bar binding machine 2 cuts the wire W and holds the cut end portion of the wire W, a cutting holding mechanism 38, a twisting mechanism 40 that twists the wire W by the rotation of a twisting motor 96, and a cutting holding mechanism 38. The binding machine main body 4 that holds the twisting mechanism 40 is provided. The cutting and sandwiching mechanism 38 includes a second guide member 280 (an example of a first sandwiching member) connected to the binding machine body 4 and a swinging member 286 connected to a link 94 driven by the rotation of the torsion motor 96. (It is an example of a second holding member). The second guide member 280 and the swinging member 286 elastically sandwich the cut end of the wire W.

The reinforcing bar binding machine 2 of the present embodiment is configured such that the second guide member 280 and the swinging member 286 elastically sandwich the cut end of the wire W. Therefore, the sandwiching interval between the second guide member 280 and the swing member 286 is adjusted by elastic deformation according to the diameter of the wire W, and the second guide member 280 and the swing member 286 can securely sandwich the wire W. it can. The wire W of various diameters can be used without the user having to readjust the holding interval of the wire W in the cutting and holding mechanism 38.

In the above embodiment, the cutting and holding mechanism 38 for cutting the wire W and holding the cut end of the wire W has been described. However, the cutting mechanism for cutting the wire W and the cutting of the wire W are performed. A pinching mechanism for pinching the ends may be separately provided. In the cutting and sandwiching mechanism 38, the first sandwiching member may be provided separately from the second guide member 280, or the second sandwiching member may be provided separately from the swinging member 286.

In the reinforcing bar binding machine 2 of the present embodiment, the second guide member 280 is connected to the binding machine body 4 via the elastic pin 288 (an example of an elastic member).

According to the above configuration, since the difference in the diameter of the wire W is absorbed by the elastic deformation of the elastic pin 288, the diameter of the wire W in the cutting and holding mechanism 38 can be adjusted without changing the holding interval of the wire W by the user. The wire W can be used.

The reinforcing bar binding machine 2 of the present embodiment further includes a feeding mechanism 32 that feeds the wire W, and a guide mechanism 34 that guides the wire W fed from the feeding mechanism 32 around the plurality of reinforcing bars R. The feed mechanism 32 and the guide mechanism 34 are held by the binding machine body 4. The guide mechanism 34 includes a first guide pin 276 and a second guide pin 282 that guide the wire W. The first guide pin 276 and the second guide pin 282 are rotatably supported by the binding machine body 4.

In the reinforcing bar binding machine 2 of the present embodiment, since the first guide pin 276 and the second guide pin 282 are rotatably supported by the binding machine body 4, when the wire W is fed, the first guide pin 276 and the second guide pin 282 are provided. The frictional force acting on the guide pin 282 can be significantly reduced. Wear of the first guide pin 276 and the second guide pin 282 can be suppressed.

The reinforcing bar binding machine 2 of the present embodiment further includes a feeding mechanism 32 that feeds the wire W, and a guide mechanism 34 that guides the wire W fed from the feeding mechanism 32 around the plurality of reinforcing bars R. The feed mechanism 32 and the guide mechanism 34 are held by the binding machine body 4. The guide mechanism 34 includes a first guide pin 276 and a second guide pin 282 that guide the wire W, and an upper guide wall 274b that guides the wire W.

The reinforcing bar binding machine 2 of the present embodiment is configured to guide the wire W by the first guide pin 276, the second guide pin 282, and the upper guide wall 274b. Compared with the configuration in which the wire W is guided only by the guide pins, the number of guide pins to be used can be reduced and the material cost can be reduced without significantly affecting the management of the bending diameter of the wire W.

Specific examples of the present invention have been described above in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in the present specification or the drawings exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Further, the technique illustrated in the present specification or the drawings can simultaneously achieve a plurality of purposes, and achieving the one purpose among them has technical utility.

2: Reinforcing bar binding machine 3: Housing 4: Binding machine body 6: Grip 7: Trigger 8: Battery mounting part 9: Terminal 10: Reel 10a: Engagement part 10b: Bearing groove 10c: Bearing groove 10d: Rotation detecting convex part 12: right outer housing 12a: through hole 14: left outer housing 16: inner housing 17: cover 17a: swing shaft 17b: rib 18: first operation display section 19: reel chamber 20: main switch 21: first operation display Substrate 22: Main power LED
23: 1st switch plate 24: 2nd operation display part 25: 2nd operation display board 26: Setting button 27: 2nd switch plate 28: Display part 30: Storage mechanism 32: Feed mechanism 34: Guide mechanism 36: Brake mechanism 37: Brake chamber 38: Cutting and clamping mechanism 40: Twisting mechanism 42: Guide member 42a: Through hole 43: Base member 44: Feed motor 46: Driving gear 46a: V-shaped groove 47: Reduction mechanism 48: Driven gear 48a: V V-shaped groove 50: Release lever 50a: Gear arm 50b: Operation arm 50c: Swing shaft 52: Compression spring 54: Lever holder 54a: Spring receiving part 56: Fixed lever 56a: Swing shaft 56b: Recess 58: Guide pipe 60: Upper curl guide 62: Lower curl guide 62a: Swing shaft 62b: Torsion spring 62c: Contact piece 64: First guide passage 66: Second guide passage 70: Cutter 72: Third guide passage 72a: Right guide wall 72b : Left guide wall 74: Guard plate 78: Open/close detection mechanism 80: Open/close detection lever 80a: Contact piece 80b: Detection piece 80c: Swing shaft 80d: Open/close detection opening 82: Torsion spring 84: Sensor board 86: Solenoid 88 : Link 90: torsion spring 92: brake arm 92a: brake opening 94: link 96: torsion motor 98: first reduction mechanism 100: second reduction mechanism 102: gripping mechanism 104: gear bracket 106: internal gear 108: planetary gear 110: Sun gear 112: Main bracket 114: Relay shaft 116: First spur gear 118: Second spur gear 120: Screw shaft 120a: Large diameter part 120b: Small diameter part 120c: Ball groove 120d: Engaging groove 122: Inner sleeve 122a: Rib 124: Outer sleeve 124a: Short fin 124b: Long fin 126: Push plate 128: Push sleeve 128a: Rib 130: Support sleeve 132: Tip shaft 134: Right hook 134a: Swing shaft 134b: Cam groove 134c: Stopper Part 136: Left hook 136a: Swing shaft 136b: Cam groove 136c: Stopper part 138: Bumper 140: Compression spring 142: Stopper 144: Ball 146: Set screw 148: Cam pin 150: Pin 152: Permanent magnet 154: Magnetic sensor 156 : Rotation limiter Structure 158: Base member 160: Upper arm member 160a: Swing shaft 160b: Restriction piece 160c: Torsion spring 162: Lower arm member 162a: Swing shaft 162b: Restriction piece 162c: Torsion spring 164: Torsion motor holding portion 166: First deceleration mechanism holder 168: Support sleeve holder 170: Torsion mechanism holder 172: Feed motor holder 174: Feed mechanism holder 176: Solenoid holder 178: Brake mechanism holder 180: Control board 182: Screw 184: Screw 185: Machine screw 186: Screw 194: Fixed bearing 196: Reel rotation detection mechanism 198: Movable bearing 200: Support member 200a: Swing shaft 202: Torsion spring 204: Slide switch 204a: Rib 206: Rotation detection lever 206a: Contact Arm 206b: Magnetic arm 206c: Swing shaft 208: Torsion spring 210: Magnetic sensor 212: Rotation detection hole 214: Permanent magnet 217: Slide latch 218: Housing mechanism cover 220: Feed mechanism cover 222: Remaining amount confirmation window 264: Right Outer plate 266: Inner plate 266a: Right guide wall 268: Left outer plate 268a: Left guide wall 274: First guide member 274a: Wire passage 274b: Upper guide wall 274c: Lower guide wall 276: First guide pin 280: Second guide member 280a: Guide wall 280b: Through hole 280c: Clamping surface 282: Second guide pin 284: Fixing member 284a: Wire passage 286: Swing member 286a: Through hole 286b: Cutting piece 286c: Pushing surface 286d: Cutting Part 286e: Clamping surface 288: Elastic pin 292: Third guide member 292a: Upper guide wall

Claims (4)

A reinforcing bar binding machine for binding a plurality of reinforcing bars with wires,
A cutting mechanism for cutting the wire,
A clamping mechanism for clamping the cut end of the wire,
A twisting mechanism for twisting the wire by rotation of a twisting motor,
It is provided with a binding machine body that holds the cutting mechanism, the sandwiching mechanism, and the twisting mechanism,
The holding mechanism includes a first holding member connected to the binding machine body via an elastic member and a second holding member connected to a link driven by rotation of the torsion motor.
A reinforcing bar binding machine in which the first clamping member and the second clamping member elastically clamp the cut end of the wire. A feeding mechanism for feeding the wire,
Further comprising a guide mechanism for guiding the wire sent from the feed mechanism around the plurality of reinforcing bars,
The feed mechanism and the guide mechanism are held by the binding machine body,
The guide mechanism includes a guide pin for guiding the wire,
The reinforcing bar binding machine according to claim 1, wherein the guide pin is rotatably supported by the binding machine body. A feeding mechanism for feeding the wire,
Further comprising a guide mechanism for guiding the wire sent from the feed mechanism around the plurality of reinforcing bars,
The feed mechanism and the guide mechanism are held by the binding machine body,
The reinforcing bar binding machine according to claim 1, wherein the guide mechanism includes a guide pin that guides the wire and a guide wall that guides the wire. A reinforcing bar binding machine for binding a plurality of reinforcing bars with wires,
A cutting mechanism for cutting the wire,
A clamping mechanism for clamping the cut end of the wire,
A twisting mechanism for twisting the wire by rotation of a twisting motor,
It is provided with a binding machine body that holds the cutting mechanism, the sandwiching mechanism, and the twisting mechanism,
The clamping mechanism includes a first clamping member connected to the binding machine body and a second clamping member connected to a link driven by rotation of the torsion motor.
When the clamping mechanism clamps the wire, the first clamping member moves with respect to the binding machine body, whereby the clamping interval between the first clamping member and the second clamping member is adjusted. Binding machine.

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