JPH0592106U - Twisting hook control device for binding machine - Google Patents

Abstract

(57) [Summary] [Structure] When the torsion drive shaft 24 rotates in the forward direction, the projection 34 on the outer peripheral surface of the sleeve 26 engages with the forward rotation stopper 27 to prevent the sleeve from rotating in the forward direction and to rotate the torsion drive shaft 2.
The sleeve 8 slides together with the ball 31 along the spiral groove 29 of 4 to rotate the hook 8 in the closing direction, and the engagement between the forward rotation stopper 27 and the protrusion 34 is disengaged at the sliding end position of the sleeve, and the sleeve is released. And the torsion drive shaft 24 are integrally rotated in the forward direction, and when the torsion drive shaft 24 is rotated in the reverse direction, the projection 34 and the reverse rotation stopper 28 are engaged to slide the sleeve to the initial position. .. [Effect] Opening / closing operation of the hook 8 for twisting the wire wound around the material to be bound 6 and at a predetermined position only by rotationally driving the torsional drive shaft 24 for rotationally driving the torsional shaft 25 in the forward and reverse directions. It is possible to twist and rotate and stop the hook 8 at a predetermined position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for a twisting hook of a binding machine, which grips and twists a part of a binding wire wound in an annular shape around a material to be bound.

[0002]

[Prior art]

 A technique disclosed in Japanese Patent Publication No. 3-60989 is known as a control device for a twisting hook of a binding wire in this type of binding machine. This is configured such that a chuck member that slides in the axial direction is arranged on the outer circumference of a torsion shaft that pivotally supports a wire gripping hook, and the hook member is opened and closed by relative movement of the chuck member and the torsion shaft. Therefore, a cam mechanism is adopted to slide the chuck member, and a power transmission switching mechanism is required to drive the torsion shaft to rotate as required.

Further, in this type of binding machine, it is necessary to position the hook at a predetermined angle and stop it after a series of binding steps are completed. A mechanism is used in which the hook is stopped at a predetermined position by rotating the hitting member to stop the reverse rotation by rotating the hitting member while rotating the hook to open the hook. Therefore, in this mechanism, since the hitting member is arranged in the vicinity of the material to be bound, the hitting member may be damaged by the contact with the material to be bound during the binding work.

[0004]

[The purpose of the device]

 The present invention solves the above-mentioned problems, and the opening and closing operation of the hook, the rotational drive at a predetermined position, and the stop of the predetermined position of the hook are performed only by the rotational drive of the torsional drive shaft in the forward and reverse directions for rotationally driving the torsion shaft. It is an object of the invention to provide a control device for a twisting hook that enables it.

[0005]

[Means for achieving the purpose]

 In order to achieve the above-mentioned object, the twisting hook control device of the binding machine according to the present invention continuously feeds a binding wire to a curved guide portion on the front side of a wire feeding mechanism, and from the tip of the curved guide portion. The unwound wire is wound around the material to be bound multiple times, and a part of the wire wound in an annular shape is held by a hook driven by a torsion drive motor and twisted to bind the material to be bound. In the binding machine, a torsion drive shaft connected to the torsion drive motor via a reduction mechanism and a torsion shaft in front of the torsion drive shaft are coaxially connected to each other, and a spiral groove is formed on an outer peripheral surface of the torsion drive shaft. And the base end of the hook is openably and closably supported on the torsion shaft, and a sleeve is provided around the torsion drive shaft and the outer periphery of the torsion shaft so as to be rotatable and axial with respect to the torsion drive shaft. Is freely slidable in the direction of the shaft The sleeve is internally slidable, and the inner surface of the sleeve has a ball accommodating part that is partially fitted in the spiral groove of the torsion drive shaft. A pin loosely fitted in the formed long hole is provided, and a plurality of protrusions are formed on the outer peripheral surface of the sleeve in the circumferential direction thereof, and engage with the protrusions to rotate the sleeve in the forward direction and the reverse direction. A forward rotation stopper and a reverse rotation stopper for blocking are arranged in the vicinity of the outer peripheral surface of the sleeve, and when the torsional drive shaft rotates in the forward direction, the projection engages the forward rotation stopper so that the sleeve is in the initial position. Directional rotation is prevented and the sleeve is slid forward along with the ball along the spiral groove of the torsion drive shaft to rotate the hook in the closing direction. The engagement is disengaged and the The sleeve and the torsion drive shaft rotate in the forward direction, while the projection and the reverse rotation stopper always engage with each other when the torsion drive shaft rotates in the reverse direction so that the sleeve slides to the initial position. Is characterized by.

[0006]

[Action]

 According to the above construction, when the torsional drive motor is started to rotate in the forward direction, the torsional drive shaft is rotationally driven in the forward direction, but the rotation of the sleeve is blocked by the contact between the protrusion of the sleeve and the forward rotation stopper. Therefore, the sleeve slides in the axial direction via the balls in the spiral groove. Since the pin moves as the sleeve slides, the hook pivotally supported by the torsion shaft is rotated in the closing direction to grip a part of the wire wound in an annular shape. Then, when the ball in the spiral groove reaches the end of the groove, the sleeve reaches the sliding end, and at this position the engagement relationship between the forward rotation stopper and the protrusion is disengaged, and the sleeve rotates integrally with the drive shaft. Then, the wire is twisted.

Next, when the drive motor rotates in the reverse direction, the sleeve is driven to rotate in the reverse direction together with the torsional drive shaft and the torsional shaft, but the protrusion of the sleeve contacts the reverse rotation stopper to rotate in the reverse direction. Since it is blocked, the sleeve then slides in the return direction and returns to the initial position by the action of the spiral groove and the ball. At this time, since the pin also moves in the same direction, the hook opens to release the wire gripping portion.

[0008]

【Example】

 FIG. 1 shows a binding machine, in which a binding wire 3 wound around a bobbin 2 is continuously supplied to a straight guide portion 4 and a curved guide portion 5 on a front side in a housing 1 of the binding machine. A wire feeding mechanism a for feeding and a hook 8 driven by a twisting drive motor 7 for a part of an annular wire 3 which is unwound from the tip of the curved guide portion 5 and is wound around the material to be bound 6 a plurality of times. A wire twisting mechanism b which is gripped and twisted by a wire and a manually operable starter switch 9 are provided, and the wire feeding mechanism is based on a detection signal of a sensor provided in each of the mechanisms a and b. A controller (which is configured on a microcomputer chip (not shown)) for controlling the operations of a and the wire twisting mechanism b is provided.

The wire feeding mechanism a includes a wire feeding roller 13 connected to an output shaft of a wire feeding motor 10 operated by a start switch 9 via a reduction gear 11 and a feeding roller (not shown) facing the wire feeding roller 13. The wire 3 is clamped, and in this state, the feed roller 13 is rotated to continuously feed the wire 3 wound around the bobbin 2 toward the linear guide portion 4 and the curved guide portion 5.

As shown in FIG. 2, the curved guide portion 5 has a curved concave groove 17 formed between one surface of the side plate portion 14 and a movable plate 16 urged by a panel 15 on this surface. However, the wire 3 is guided so as to bend when passing through the concave groove 17, and is formed into an annular shape as it is so as to be wound around the material to be bound 6 a plurality of times. The movable plate 16 is housed in a curved concave groove 17 formed in parallel with the concave groove 17 on the other side of the portion 14, and after the wire is cut, the movable plate 16 causes the spring 15 to move by the force of separating the binding machine from the binding material 6. Against this, the wire 3 in the groove 17 is detached from the side plate portion 14 as shown by the dotted line.

A cutting mechanism c is arranged between the linear guide portion 4 and the curved guide portion 5. This cutting mechanism c is for cutting the wire in front of the curved guide portion 5 by rotating the shearing cutter 18 with the rod 19 and the link plate 20, and the link plate 20 is linked with a twisting mechanism b described later. A piece 21 is formed.

It should be noted that the feed sensor 22 including the magnet 22 a fixed to the peripheral surface of the reduction gear 11 of the feed motor 10 and the Hall element 22 b arranged on the housing 1 side is used to detect the wire feed reduction gear 11 by the feed sensor 22. When the number of rotations is detected and the wire 3 wound around the material to be bound 6 reaches a predetermined feed amount (the above number of rotations reaches a predetermined number), a detection signal is output and the control device causes the feed motor 10 to rotate. And the wire twisting mechanism b is activated.

The wire twisting mechanism b moves the hook 8 that holds the wire 3 by the twisting drive motor 7 between a predetermined holding position and a standby position, and rotates in the forward direction by the twisting drive motor 7 at the holding position. When driven, it grips and twists part of the annular wire 3 wound around the material to be bound 6, and releases the wire 3 when it is driven to rotate in the opposite direction. A torsion drive shaft 24 (see FIGS. 3 (a) and 3 (b)) connected to the motor 7 via a reduction mechanism 23 and a torsion shaft 25 in front of the torsion drive shaft 24 are arranged coaxially. 25, the hook 8 is pivotally supported to be openable and closable, and a sleeve 26 is arranged on the outer circumferences of the torsion drive shaft 24 and the torsion shaft 25. Further, a forward rotation stopper 27 and a reverse rotation stopper are provided near the outer peripheral surface of the sleeve 26. 28 (See Figure 1 ) And it is constructed by placing.

A spiral groove 29 is formed on the outer peripheral surface of the torsion drive shaft 24, and the torsion drive shaft 24 and the torsion shaft 25 are connected so as to rotate independently about the same axis. A base end of the hook 8 is pivotally supported by the torsion shaft 25, and a long hole 30 is formed through the center of the hook 8.

The sleeve 26 is an outer sleeve 26 a and an inner sleeve 26 b that are integrally connected to each other by a pin. The sleeve 26 is rotatable with respect to the torsion drive shaft 24 and slides axially with respect to the torsion drive shaft 24 and the torsion shaft 25. It is provided freely.

An accommodating portion 39 for a ball 31 partly fitted in the spiral groove 29 is formed on the inner surface of the sleeve 26, and a loose fitting portion is formed in the elongated hole 30 of the hook 8 on the tip end side of the sleeve 26. The pin 32 is provided, and a notch 33 that allows the hook 8 to rotate is formed in the upper and lower opposing walls. A plurality of protrusions 34 are formed on the outer peripheral surface of the sleeve 26 in the circumferential direction. The protrusion 34 is formed with a long protrusion 34a and a short protrusion 34b in the longitudinal direction of the sleeve 26.

The forward rotation stopper 27 and the backward rotation stopper 28 respectively prevent the forward rotation and the backward rotation of the sleeve 26. The forward rotation stopper 27 and the backward rotation stopper 28 are mounted on the support base 35 near the outer peripheral surface of the sleeve 26 in the axial direction of the sleeve 26. It is arranged in parallel with. Each of the stoppers 27 and 28 is pivotally supported so as to rotate only in one direction as shown in FIG. 4 (b), and is biased in the opposite direction by a spring 36.

The forward / reverse rotation stoppers 27 and 28 and the protrusion 34 of the sleeve 26 are engaged with the forward rotation stopper 27 when the torsion drive shaft 24 is rotated in the forward direction, and the protrusion 34 of the sleeve 26 at the initial position. The forward rotation is blocked, and the sleeve 26 is slid forward together with the ball 31 along the spiral groove 29 of the torsion drive shaft 24 to rotate the hook 8 in the closing direction, and the forward rotation is performed at the sliding end position of the sleeve 26. The engagement between the stopper 27 and the protrusion 34 is disengaged to rotate the sleeve 26 and the torsional drive shaft 24 integrally in the forward direction, while the protrusion 34 and the reverse rotation stopper 28 are constantly rotated when the torsional drive shaft 24 rotates in the reverse direction. Are engaged to slide the sleeve 26 to the initial position.

Further, as shown in FIG. 1, a bulging plate 37 that bulges in the radial direction is fixed to the base end portion of the sleeve 26, and a magnet 38 a is fixed to the rear surface of the bulging plate 37. On the other hand, the hall element 38b is arranged on the front surface of the cover body 39 of the speed reduction mechanism, and the return position detection sensor 38 for detecting that the torsion mechanism b is at the predetermined return position is constituted by the above-mentioned magnet 38a and hall element 38b. Has been done. The overhang plate 37 is formed so as to be able to engage with the operating piece 21 of the rod 19 of the cutting mechanism c when the sleeve 26 slides.

According to the twisting mechanism b, the wire is fed by the wire feeding mechanism a by a predetermined amount, and the wire is wound around the material to be bound 6 to form the annular portion, and then the twisting drive motor 7 is rotated in the forward direction. When the rotation drive is started, the torsion drive shaft 24 is rotationally driven in the positive direction. As a result, the rotational force is transmitted to the sleeve 26 via the spiral groove 29 formed on the outer peripheral surface of the drive shaft and the ball 31 loosely fitted in the housing portion 40 of the sleeve 26. Since the rotation of the sleeve 26 is blocked by the contact between the protrusion 34 and the normal rotation stopper 27, the sleeve 26 slides in the axial direction via the balls 31 in the spiral groove 29 (FIGS. 4 (a) and (b)). reference). Since the pin 32 also moves as the sleeve 26 slides, the hook 8 pivotally supported by the torsion shaft 25 is rotated in the closing direction, and the wire 3 wound in an annular shape between the hook 8 and the tip of the sleeve 26 is rotated. Hold a part. Since the overhanging plate 37 also slides when the sleeve 26 slides, the operating piece 21 of the rod 19 of the cutting mechanism c shown in FIG. 1 is pressed and operated during the sliding. As a result, the cutting mechanism c is operated, the shearing cutter 18 is rotationally driven with respect to the wire guide 40, and the continuity between the wire guide 40 and the wire passage in the shearing cutter 18 is interrupted, whereby the wire 3 is It is cut before the curved guide portion 5.

When the ball 31 in the spiral groove 29 reaches the end of the groove, the sleeve 26 reaches the sliding end. Therefore, as shown in FIGS. The engagement with 34 is disengaged, and the sleeve 26 is rotated in the forward direction together with the torsion drive shaft 24. Since the sleeve 26 is integral with the hook 8 in the rotational direction, the hook 8 holding the wire 3 is also rotationally driven to twist the wire 3. During this time, the reverse rotation stopper 28 is engaged with the protrusion 34 but is rotated in the escape direction.

Next, a predetermined load torque is detected by a load torque detection mechanism (not shown), and the torsional drive motor 7 rotates in the opposite direction, so that the torsional drive shaft 24 and the torsion shaft 25 as well as the sleeve 26 reverse. However, the projection 34 of the sleeve 26 comes into contact with the reverse rotation stopper 28 to prevent reverse rotation (see FIGS. 6 (a) and 6 (b)). In this case, a plurality of protrusions 34 on the outer peripheral surface of the sleeve 26 are formed in the circumferential direction so that the amount of reverse rotation of the sleeve 26 is small. This is because if the amount of rotation is large, the twist of the wire 3 will be returned. By the reverse rotation prevention of the sleeve 26, the sleeve 26 slides in the returning direction by the action of the spiral groove 29 and the ball 31 (see (a) and (b) in FIGS. 7 and 8). At this time, since the pin also moves in the same direction, the hook 8 opens to release the grip portion of the wire 3.

When the sleeve 26 returns to the standby position shown in FIGS. 9 (a) and 9 (b), the return position detection sensor 38 detects this and outputs a detection signal, and the controller drives the torsional drive motor 7 to stop. The binding operation is completed.

Note that one of the plurality of protrusions 34 formed on the outer periphery of the sleeve 26 is long, and the short protrusion 34b and the reverse rotation stopper 28 are engaged with each other during the sliding of the sleeve 26 in the return direction. When disengaged, the hook 8 is rotated again and engages with the long protrusion 34a to stop the rotation. The engagement position between the long protrusion 34a and the reverse rotation stopper 28 becomes the regular standby position (initial position) of the hook 8.

[0025]

【effect】

 According to the present invention, the opening / closing operation and the predetermined position of the hook for twisting the wire wound around the material to be bound are performed only by rotating the twisting drive shaft in the forward and reverse directions, which drives the twisting shaft to rotate. Since it is possible to twist and rotate the hook and stop the hook at a predetermined position, and the conventional cam mechanism and power transmission mechanism are unnecessary, the structure is simplified and the entire apparatus can be made compact.

Further, since the protrusion formed on the outer circumference of the sleeve and the forward rotation stopper and the reverse rotation stopper can both be arranged on the base side of the sleeve, the protrusion contacts the material to be bound during the binding work. There is no risk of contact and damage.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view of a binding machine according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 (a) and 3 (b) are a longitudinal sectional view and a lateral sectional view of a main part of a twisting mechanism of the binding machine.

4 (a) and 4 (b) are respectively a front view and a side view at the time of starting the operation of the twisting mechanism.

5 (a) and 5 (b) are respectively a front view and a side view of the above-mentioned twisting mechanism at the time of normal rotation.

6 (a) and 6 (b) are respectively a front view and a side view at the time of starting reverse rotation of the twisting mechanism.

7A and 7B are a front view and a side view, respectively, when the hook is opened in the twisting mechanism.

8 (a) and 8 (b) are respectively a front view and a side view of the twisting mechanism at the time of returning operation.

9A and 9B are respectively a front view and a side view of an initial position of the twisting mechanism.

[Explanation of symbols]

 a Wire supply mechanism 3 Wire 5 Curved guide part 6 Bound material 7 Drive motor 8 Hook 24 Torsional drive shaft 25 Torsional shaft 26 Sleeve 27 Forward rotation stopper 28 Reverse rotation stopper 29 Spiral groove 30 Long hole 31 Ball 34 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A binding wire is continuously fed to a curved guide portion on the front side of a wire feeding mechanism, and a wire fed from the tip of the curved guide portion is wound around a material to be bound a plurality of times. A binding machine for binding a material to be bound by gripping and twisting a part of an annularly wound wire with a hook driven by a twisting drive motor, which is connected to the twisting drive motor through a reduction mechanism. The twisted drive shaft and the twisted shaft in front of the twisted drive shaft are coaxially connected so as to rotate independently of each other, and a spiral groove is formed on the outer peripheral surface of the twisted drive shaft. A base end of the hook is openably and closably supported, and a sleeve is provided on the outer circumference of the torsion drive shaft and the torsion shaft so as to be rotatable with respect to the torsion drive shaft and axially with respect to the torsion drive shaft and the torsion shaft. It is slidably arranged and Is formed with a ball accommodating portion, a part of which is fitted in the spiral groove of the torsion drive shaft, and a pin loosely fitted in a long hole formed in the central portion of the hook is provided on the tip side of the sleeve. In addition, a plurality of protrusions are formed on the outer peripheral surface of the sleeve in the circumferential direction thereof, and a forward rotation stopper and a backward rotation stopper that engage with the protrusions to prevent forward rotation and reverse rotation of the sleeve are provided. When the torsional drive shaft rotates in the forward direction, the protrusion engages with the forward rotation stopper to prevent the sleeve from rotating in the initial position in the forward direction, and the ball moves along the spiral groove of the torsional drive shaft. At the same time, slide the sleeve forward to rotate the hook in the closing direction, and at the sliding end position of the sleeve, the engagement between the forward rotation stopper and the protrusion is disengaged, and the sleeve and torsion drive shaft rotate in the forward direction as a unit. Let one On the other hand, the twisting hook control device for the binding machine is characterized in that the projection is always engaged with the reverse rotation stopper so that the sleeve slides to the initial position when the twisting drive shaft rotates in the reverse direction.