JPH0625454U - Bobbin mechanism for wire binding machine - Google Patents

Abstract

(57) [Summary] [Structure] When the bobbin divided bodies forming the wire bobbin 5 are in a separated state, the engaging portion 23 of the support shaft 4 is engaged with the bobbin cover lock 7, and the length required for the last one time is increased. When the binding wire 8 is consumed, the bobbin split body moves in the approaching direction to disengage the engagement, and the bobbin cover 6 is actuated in the opening direction by the spring bias. [Effect] The binding wire 8 on the wire bobbin 5 during the binding work
Is consumed, and when the wire of the length required for the final binding is consumed, the bobbin divided body approaches, the engagement between the support shaft 4 and the bobbin cover lock 7 is released, and the bobbin cover 6 is opened. . Since the operator can recognize that the wire is finished by this work, it is possible to prevent the wire from remaining between the cutter mechanism and the outlet 36 of the bending guide 31.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a wire bobbin for winding a binding wire to be used in a wire binding machine.When the binding wire is consumed and the remaining amount is very small, the bobbin cover is opened to inform that there is almost no remaining amount. Regarding the bobbin mechanism.

[0002]

[Prior art and its problems]

 Recently, a wire tying machine for tying up reinforcing bars for construction has been proposed as shown in FIG. This is provided with a curved wire guide 31 at the tip of the housing 1, and a long wire 8 is fed into the curved guide 31 from a bobbin mechanism 32 provided on the opposite side of the housing, and the wire 8 is looped at the tip of the curved guide 31. And to twist the annular part. In this type of wire binding machine, as shown in FIG. 7, the wire feeding mechanism 33 is driven, and the torsion shaft 34 detects a predetermined load torque to return the apparatus to the initial state and complete one cycle. Although it is controlled so that one cycle is completed even when the torsional drive by the torsion shaft 34 elapses for a predetermined time.

Further, in this binding machine, a wire cutting cutter mechanism 35 is arranged in the middle of the bending guide, and the binding wire 8 is cut when the torsion shaft 34 is driven. Is arranged behind the bending guide 31, and a means such as fixing the rear end of the binding wire 8 to the bobbin is adopted so that the end of the binding wire 8 is not fed from the supply mechanism toward the bending guide 31. Has been done.

However, with the tip of the binding wire 8 reaching between the cutter mechanism 35 and the outlet 36 of the bending guide 31, the supply of the wire 8 from the bobbin mechanism is stopped, and one cycle of the binding machine is completed. When the mechanism 35 operates, the tie wire 8A cut between the cutter mechanism 35 and the outlet 36 of the curved guide 31 remains and cannot be taken out. When a new binding wire is loaded and used in this state, the binding wire 8A cut in the bending guide 31 and the new wire may intersect with each other to cause clogging. In this case, since the curved guide 31 must be disassembled to remove the cut wire 8A, the removing work becomes very complicated and the binding work is delayed.

[0005]

[The purpose of the device]

 In view of the above-mentioned problems, the present invention automatically opens the bobbin cover with the wire having a length required for bundling at least once left on the wire bobbin, and the wire is finished by this operation. It is an object of the present invention to provide a bobbin mechanism for a wire tying machine that prevents the wire from remaining between the cutter mechanism and the outlet of the bending guide by making the operator recognize the wire.

[0006]

[Means for achieving the purpose]

 In order to achieve the above object, a bobbin mechanism for a wire binding machine according to the present invention supports a pair of brackets protruding from a housing of the wire binding machine, and a bracket that is rotatable and axially slidable with respect to one of the brackets. Support shaft, the wire bobbin rotatably supported by the support shaft on the inner side of the bracket, one side wall is integrally supported by the support shaft in the rotational direction, and the other side wall is rotatable by the other bracket. A bobbin cover that is supported by the spring and is biased in the opening direction by a spring, and a bobbin that is detachably attached to an engaging portion formed on the support shaft and that holds the bobbin cover in the closed position during engagement. A bobbin divided body which is divided into two parts at right angles to the axial direction so as to approach and be separated from each other in the axial direction. The split bodies are biased by springs toward each other, and the binding wire is tightly wound on the wire bobbin in a state where the bobbin split bodies are isolated to hold both bobbin split bodies in the isolated state. When the binding wire loses the support by the wound wire when the wire of the length required for the last one binding is consumed, the bobbin split bodies are wound so that the bobbin divided bodies move in the approaching direction by the spring bias. The support shaft is moved in the axial direction following the approach and separation of the bobbin divided body, and is engaged with the bobbin cover lock when the bobbin divided body is in the separated state. When the body moves in the approaching direction, the engagement between the engaging portion of the support shaft and the bobbin cover lock is disengaged, and the bobbin cover is operated in the opening direction.

[0007]

[Function and effect of the device]

 According to the above configuration, the binding wire on the wire bobbin is unwound and gradually consumed during the binding operation. When the wire of the length required for the last bundling is consumed, the support by the wound wire is lost, and both bobbin divided bodies move in the approaching direction by the spring bias. As a result, the engagement between the engaging portion of the support shaft and the bobbin cover lock is disengaged, the support shaft becomes rotatable, and the bobbin cover operates in the opening direction.

Therefore, the worker can recognize that the wire is finished in this work, and by stopping the work here, the wire remains between the cutter mechanism and the outlet of the curved guide. Can be effectively prevented.

[0009]

【Example】

 FIG. 1 shows a bobbin mechanism provided at the rear portion of the wire binding machine. The bobbin mechanism has a pair of brackets 2 and 3 projectingly formed from a housing 1 of the wire binding machine and one bracket 2. And a wire bobbin 5 rotatably supported by the support shaft 4 inside the brackets 2 and 3, and a support shaft 4 rotatably and slidably supported in the axial direction, and arranged outside the brackets 2 and 3. The bobbin cover 6 covers the wire bobbin 5 and a bobbin cover lock 7 that holds the bobbin cover 6 in the closed position during normal operation.

The wire bobbin 5 is formed by projecting flanges 10 at both ends of the winding tubular portion 9 of the binding wire 8, and is divided into two parts in the winding tubular portion 9 at right angles to the axial direction. A small-diameter tubular portion 11 is formed on the wire winding tubular portion 9a of the one bobbin divided body 5a so as to project in the extension direction of the axis line. Are fitted so that they can approach and separate in the axial direction, and the wire bobbin 5 is constructed by this combination. The wire winding tubular portion 9b of the other bobbin divided body 5b is formed to have a length such that the binding wire 8 is wound by a length required for at least one binding. It should be noted that the end of the small-diameter tubular portion 11 of the wire winding tubular portion 9a of one bobbin divided body 5a and the edge of the wire winding tubular portion 9 of the other bobbin divided body 5b are engaged with each other so that they cannot be separated. Has been done.

A binding wire 8 is tightly wound around the wire bobbin 5 with the bobbin divided bodies 5a and 5b being separated from each other. Then, the binding wire 8 is also wound around the groove portion 14 formed by the small-diameter tubular portion 11 of the one bobbin divided body 5a to hold the bobbin divided bodies 5a and 5b in an axially isolated state. . Further, the portion w on the starting end side of the binding wire 8 following the portion wound on the groove portion 14 has a length required for at least one binding on the wire winding tubular portion 9b of the other bobbin divided body 5b. It is wound.

The groove portion 14 of the wire bobbin 5 may be divided at the flange 10 portion between the end portion of the winding tubular portion 9a of one bobbin divided body 5a and the flange 10, as shown in FIG. In this case, the groove 14 may be wound on the starting end side of the binding wire 8 by a length required for binding at least twice.

The wire bobbin 5 is arranged inside the pair of brackets 2 and 3, and is supported by the supporting shaft 4 and the brackets 2 and 3 described below. The support shaft 4 is a short shaft and is arranged inside one of the brackets 2 so as to be movable in the axial direction and rotatably. Further, an engagement edge 15 is formed so as to project from the inner end portion, and the engagement edge 15 is engaged with an engagement hole 16 formed in the center of one side surface of the wire bobbin 5. On the other hand, a circular engaging protrusion 17 is formed inside the other bracket 3 coaxially with the support shaft 4, and the engaging protrusion 17 is formed at the center of the other side surface of the wire bobbin 5. Is engaged with the engaging hole 18. As a result, the wire bobbin 5 is rotatably supported by the support shaft 4 and the engaging projections 17.

Further, a compression spring 19 is arranged between the engaging edge 15 of the support shaft 4 and the bracket 2, and the support shaft 4 keeps the bobbin divided bodies 5 a and 5 b of the wire bobbin 5 apart from each other by the compression spring 19. The support shaft 4 is configured to be urged by a spring in an approaching direction so as to move the supporting shaft 4 in the axial direction following the approaching and separating directions of the bobbin split bodies 5a and 5b in the axial direction. A retaining member 20 is provided at one end of the support shaft 4.

Next, the bobbin cover 6 is formed to have a substantially U-shaped cross section, and one side wall of the bobbin cover 6 is fitted to the non-circular end portion 4a formed on the support shaft 4 to rotate in the rotational direction, as shown in FIG. The side wall is integrally supported, and the other side wall is rotatably supported on the outer side of the other bracket 3 by a short shaft body 21 coaxially arranged with the engaging convex portion 17. The support shaft 4 rotates integrally with the bobbin cover 6, but is movable in the axial direction. An opening spring 22 is wound around the short shaft body 21, one end of which is engaged with the bracket 3 and the other end thereof is engaged with the bobbin cover 6, whereby the bobbin cover 6 is spring-biased in the opening direction.

The bobbin cover 6 is locked in a closed state by a bobbin cover lock 7. As shown in FIG. 4, the bobbin cover lock 7 is formed by forming one half portion 7a of a short cylinder in a wall thickness, and the support shaft 4 is provided between the one side wall of the bobbin cover 6 and one bracket 2. It is arranged so as to penetrate therethrough, and is fixed to the bracket 2 with the thick portion 7a inside. On the other hand, a shaft-like engaging portion 23 as shown in FIG. The engaging portion 23 is arranged at a position where it can be engaged with a step surface 24 with the thick portion 7a of the bobbin cover lock 7. When the bobbin divided body of the wire bobbin 5 is in the separated state and the support shaft 4 is pushed outward in the axial direction against the compression spring 19, the engaging portion 23 engages with the bobbin cover lock 7, At this time, the bobbin cover 6 is configured to be closed.

Further, as shown in FIG. 5, the bracket 2 receives the engaging portion 23 at a position corresponding to the bobbin cover lock 7 when the support shaft 4 moves inward in the axial direction. A notch 25 (may be a recess) for forming is formed. The notch 25 is formed to such an extent that the support shaft 4 rotates about 90 degrees and the bobbin cover 6 can rotate in the opening direction.

In the above structure, the engaging portion 23 of the support shaft 4 normally engages with the step surface 24 of the bobbin cover lock 7, and the support shaft 4 does not rotate. Therefore, the bobbin cover 6 remains closed. It has become. During the bundling operation, as shown in FIG. 7, the bundling wire 8 on the wire bobbin 5 is sent out from the outlet 36 of the bending guide 31 by the wire supply mechanism 33 in the housing 1 and wound around the object to be bound. After being cut by the cutter mechanism 35 between the wire and the subsequent wire, the wire of the winding portion is twisted by the twisting shaft 34 to bind the objects to be bound. By repeating this, the binding wire 8 on the wire bobbin 5 is rewound and consumed little by little. Finally, when the binding wire 8 wound around the groove portion 14 of the small-diameter tubular portion 11 of the one bobbin divided body 5a of the wire bobbin 5 of FIG. 1 is consumed, both bobbin divided bodies 5a and 5b are formed by the binding wire 8. It loses its support, and as shown in FIG. 2, the spring forces of the compression springs 19 cause them to move toward each other. Therefore, since the support shaft 4 also moves inward in the axial direction, the engaging portion 23 also moves in the same direction and enters the notch 25 of the bracket 2 (see FIG. 5). As a result, the engagement between the engagement portion 23 and the bobbin cover lock 7 is disengaged, and the support shaft 4 becomes rotatable. Therefore, the opening spring 22 works and the bobbin cover 6 is urged by the spring to move in the opening direction. Move (see the dotted line in FIG. 3). When in the open state, the engaging portion 23 of the support shaft 4 abuts on the other end of the notch 25 and does not rotate any more, so the bobbin cover 6 is held in the open state.

As described above, when the remaining winding amount of the binding wire 8 becomes small, the bobbin cover 6 opens, so that the worker recognizes that the binding wire is insufficient in the remaining work. You can Therefore, if the work is stopped here, the wire 8 will not remain between the cutter mechanism 35 and the outlet 36 of the curved guide 31 in FIG. At the same time, the starting end of the last bundling wire 8 may remain in the groove 14 of the wire bobbin 5, and the bobbin cover 6 may not be opened due to insufficient movement of the support shaft 4. However, at this point, at least the wire required for the last one binding is left on the winding tubular portion 9 of the other bobbin split body 5b of the wire bobbin 5, so that the bobbin cover after the binding work is completed. 6 is opened, and the operator can visually confirm that no wire remains. Therefore, it is possible to effectively prevent the binding wire from remaining between the cutter mechanism and the outlet 36 of the curved guide 31.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bobbin mechanism according to the present invention when the wire binding machine is viewed from above.

FIG. 2 is a sectional view showing a state in which a bobbin cover is opened by the operation of the bobbin mechanism.

FIG. 3 is a side view showing a mounting state of a support shaft and a bobbin cover.

FIG. 4 is a perspective view of a bobbin cover lock.

5 is a cross-sectional view taken along the line XX of FIG.

FIG. 6 is an explanatory diagram of another example of the division mode of the wire bobbin.

FIG. 7 is a schematic explanatory view of an entire wire binding machine.

[Explanation of symbols]

 4 support shaft 5 wire bobbin 5a bobbin divided body 5b bobbin divided body 6 bobbin cover 7 bobbin cover lock 8 binding wire 23 engaging part

Claims (1)

[Scope of utility model registration request] 1. A pair of brackets formed so as to project from a housing of a wire binding machine, a support shaft supported so as to be rotatable and axially slidable with respect to one of the brackets, and the support shaft inside the bracket. A wire bobbin rotatably supported on one side wall, one side wall integrally supported on the support shaft in the rotational direction, the other side wall rotatably supported on the other bracket, and a spring-biased bobbin cover, A bobbin cover lock which is provided to be engageable with and disengageable from an engaging portion formed on the support shaft and holds the bobbin cover at a closed position at the time of engagement, and the wire bobbin is perpendicular to the axial direction. The bobbin divided bodies divided into two are formed so as to be able to approach and be separated from each other in the axial direction, and both bobbin divided bodies are spring-biased in a direction of approaching each other. A wire having a length required for the last one bundling is obtained by tightly winding a binding wire on a wire bobbin in a state where the bobbin split body is isolated to hold both bobbin split bodies in an isolated state. When the bobbin divided body is consumed, the bobbin divided body loses its support by the wound wire and is wound so that both bobbin divided bodies move in the approaching direction by the spring bias, and the supporting shaft follows the approaching and separating of the bobbin divided body. The bobbin divided body is moved in the axial direction and is engaged with the bobbin cover lock when the bobbin divided body is in the separated state, and the bobbin divided body is moved in the approaching direction, so that the engaging portion of the support shaft and the bobbin cover. A bobbin mechanism for a wire binding machine, characterized in that the engagement with the lock is released to operate the bobbin cover in the opening direction.