JPH11314609A - String bundling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove bites by controlling firmly a clamp pawl in the given direction without increasing the motor load. SOLUTION: The rotation of a clamp pawl 43 is prevented strongly only at the time of not driving the pawl 43 by a string bundling device. The pawl 43 is driven by a motor through a sector gear 94 and a drive transmission gear 93 geared with the sector gear. At the time of not driving the pawl 43, a slide contact face 111 of a control member 110 rotated integrally with the drive transmission gear 93 is brought into contact slidably with a peripheral face 101 of a mask 100 rotated integrally with the sector gear 94. At the time of driving the clamp pawl 43, the rotation of the control member 110 is allowed by a recessed section 102 formed on a disk 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string tying device which ties a string wound around an object to be tied by forming a knot.

[0002]

2. Description of the Related Art Conventionally, in the above-described string binding device, the objects to be bound are bound as follows. That is, first, the winding mechanism winds the string around the object to be tied on the mounting table, and also aligns the winding start part and the winding end part of the wound string in the same direction, and ties the object to be tied and It is stretched between a position that is a predetermined distance away from the object.

[0003] Next, a movable body capable of moving back and forth with respect to the stretched portion, a rotating shaft rotatably supported by the movable body, and a pair of members arranged side by side in the axial direction of the rotating shaft so as to be integrally rotatable. The knot is formed as follows by a knot forming mechanism having a beak-shaped clamp claw. That is, with the rotation of the rotating shaft, a part of the stretched portion is hooked and twisted by a clamp claw to form a loop that binds both clamp claws, and a portion near the loop is clamped by the clamp claw. Then, a knot is formed by pulling out a clamped portion through the loop while crossing the loop as the movable body moves.

Since the winding mechanism and the knot forming mechanism are driven by a single motor, the driving connection with the motor is released during the winding process by the winding mechanism. It was necessary to wait in a state of being left.
Specifically, the clamp claw needs to be released from the drive connection with the motor and wait in a predetermined direction until the clamp claw is formed and the drive by the motor is started. The clamp claw thus disconnected will easily change its direction when subjected to an external force.

Therefore, the clamp claws have been regulated in the above-described predetermined direction as follows. That is, a roller attached to the back of the clamp claw with the clamp claw facing the predetermined direction and capable of rotating integrally with the clamp claw around the rotation axis is a movable member facing the roller. It fits into the depression formed on the surface. The fitted roller is urged by a leaf spring attached to the movable body so as not to move from the recess.

[0006]

On the other hand, in the knot forming step, the motor and the clamp pawl are drivingly connected, and the motor rotates the clamp pawl. At this time, the motor has to rotate the clamp claw so that the roller comes out of the recessed portion against the urging force of the leaf spring.

When the urging force of the leaf spring is increased to ensure the position control of the clamp claw when the clamp claw is not driven, the load on the motor at the time of driving the clamp claw is increased. A motor must be employed. However, in such a case, in addition to the increase in manufacturing cost, the torque loss is large and there is a problem in energy saving. For this reason, it was not practically possible to increase the urging force of the leaf spring. Therefore, the clamp claws cannot be restricted sufficiently in a predetermined direction.

[0008] As a result, when an external force is applied, the clamp claw sometimes rotates and deviates from the predetermined direction. If the operation is continued while being shifted, the clamp claw collides with another member in the middle of the string binding operation, and the operation becomes inoperable. So-called biting occurred.

Further, at the end of the string binding operation, the bias of the roller is weakened in order to open the clamp claws.
As a result, the regulation of the clamp claws in the predetermined direction is also weakened. Further, when the object to be bound is taken out without leaving the string from the clamp claws, the string is pulled, so that an external force easily acts on the clamp claws connected to the string. Therefore, biting was particularly likely to occur.

Accordingly, an object of the present invention is to solve the above-mentioned technical problem, and to strongly restrain the clamp claws in a predetermined direction without increasing the motor load, thereby removing the cord which can be jammed. It is to provide a binding device.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a string tying device, comprising: a fixed frame; a mounting table supported by the fixed frame for mounting an object to be tied; While wrapping the string around the object to be tied placed on the mounting table, the winding start part and the winding end part of the wrapped string are aligned in the same direction, and the object to be tied and the object to be tied are separated by a predetermined distance. A winding mechanism that stretches between the positions, a movable body supported by a fixed frame so as to be able to advance and retreat with respect to the stretched portion, a rotating shaft rotatably supported by the movable body, and It includes a pair of beak-shaped clamp claws that are arranged so as to be integrally rotatable side by side in the axial direction, and the middle of the stretched portion is hooked and twisted by the clamp claws as the rotation shaft rotates. Clamp Knot forming mechanism that forms a loop that ties the loop, clamps a portion near the loop with a clamp claw, and pulls out the clamped portion through the loop while crossing the loop as the movable body moves. And a string tying device including a single motor that drives the winding mechanism and the knot forming mechanism, and a drive transmission mechanism that selectively drives and connects the winding mechanism and the knot forming mechanism to the motor. The drive transmission mechanism further includes a stopper mechanism that prevents rotation of the clamp claw only when the drive connection of the knot forming mechanism is released.

According to this configuration, during the winding step in which the winding mechanism operates, the knot forming mechanism releases the drive connection to the motor by the drive transmission mechanism, and simultaneously rotates the clamp pawl with the stopper. Blocked by mechanism.

In the knot forming step, the stopping of the rotation of the clamp claws by the stopper mechanism is released, and the knot forming mechanism is drivingly connected to the motor by the drive transmission mechanism. Thereafter, when the drive connection between the knot forming mechanism and the motor is released by the drive transmission mechanism, the stopper mechanism again stops the rotation of the clamp pawl.

According to a second aspect of the present invention, in the first aspect, the drive transmission mechanism is rotatably supported by a fixed frame and rotates in conjunction with the rotation shaft. A transmission gear and a sector gear rotatably supported by the fixed frame, constantly rotated by a motor, and meshing with the drive transmission gear only in a step of forming a knot; the stopper mechanism is controlled by the motor; A disk that is always driven to rotate, and is provided so as to be integrally rotatable coaxially with the drive transmission gear, and has a concave sliding contact surface that can follow the peripheral surface of the disk,
A regulating member which is displaced between a regulating position for regulating the rotation of itself and the drive transmission gear and a non-regulating position for avoiding the sliding contact with the sliding contact surface being in sliding contact with the peripheral surface of the disk; It is characterized in that it includes a concave portion formed on a part of the peripheral surface of the plate and allowing rotation of the regulating member in a state where the sector gear and the drive transmission gear mesh with each other.

According to this configuration, the operation of the invention according to claim 1 is realized as follows. That is, the sector gear or the concave portion of the disk that is constantly rotating is engaged with the corresponding drive transmission gear or the regulating member only at a predetermined rotational phase.

First, during the winding step, the engagement between the sector gear and the drive transmission gear is avoided, and the drive transmission is performed in a state where the sliding surface of the regulating member at the regulating position is in sliding contact with the peripheral surface of the disk. The rotation of the gear and the clamp pawl is restricted.

Then, in the knot forming step, the sector gear and the drive transmission gear mesh with each other, so that the clamp claws involved in knot formation are driven. At this time, the regulating member allowed to rotate by the concave portion of the peripheral surface of the disk once displaces from the regulating position to the non-regulating position to allow the drive transmission to the clamp claw, and then returns to the regulating position again, and Regulate the rotation of the nail.

Further, in addition to the effect of the first aspect of the present invention, since the concave sliding surface comes into surface contact with the peripheral surface of the disk, an impact force when the sliding surface comes into contact with the peripheral surface is obtained. Can be alleviated. As a result, high durability can be obtained. According to a third aspect of the present invention, in the second aspect of the present invention, at least two of the restricting members are capable of rolling on a peripheral surface of a disk in place of the sliding surface. And the rotation of the drive transmission gear is regulated while these rolling elements are rolled on the peripheral surface of the disk.

According to the above construction, in addition to the operation of the invention according to claim 2, the rolling element can roll on the peripheral surface of the disk, so that the regulating member slides on the disk. Rotational resistance of the disk can be reduced.

[0020]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

(1) Schematic Configuration FIG. 1 is a perspective view of a string binding device according to the present embodiment.
In FIG. 1, the direction of the arrow X is the rear. In this string binding device, a fixed frame 1 as a machine frame, a mounting table 2 supported by the fixed frame 1, and on which an object H to be bound is placed,
A known binding mechanism 3 including a winding mechanism and a knot forming mechanism, which will be described later, for winding a string around the object H to be bound on the mounting table 2 to form a knot, and driving the binding mechanism 3 And a transmission mechanism 5 for transmitting the rotation of the motor 4 to the binding mechanism 3 and the like. Also, in this string tying device, the rotating arm 6 guides and supplies the above-mentioned string around the object H to be tied from behind the string tying device.
And a cover 13 that covers the periphery of the rotating arm 6 that rotates.

The rotating arm 6 is rotatably supported around a rotation center axis C1 extending forward and rearward at the rear of the fixed frame 1 behind the mounting table 2 and inside the rotating arm 6 formed hollow. By passing the string, the string can be guided to the tip 6a of the rotating arm 6, and the string can be paid out from the opened tip 6a. The tip 6a of the rotating arm 6 is bent forward to reach the vicinity of the center of the mounting table 2 in the front-rear direction.

The mounting table 2 includes a front mounting table 11 fixed to a front portion of the fixed frame 1, a mounting surface behind the front mounting table 11, and a mounting surface flush with the mounting surface of the front mounting table 11. And a rear mounting table 12 having Below the rear mounting table 12,
A space 22 is provided for the rotation arm 6 to pass therethrough and for the binding mechanism 3 to operate, and a space 21 communicating with the space 22 is provided between the front mounting table 11 and the rear mounting table 12. I have.

The gap 21 allows the cord to pass through as the rotating arm 6 rotates. By passing through the gap 21, the string is wound on the mounting table 2 around the material H to be tied, which is mounted by hanging the front mounting table 11 and the rear mounting table 12, and by the tying mechanism 3. A string binding operation is performed.

Hereinafter, the string binding operation and the binding mechanism 3 will be described.
The winding mechanism and the knot forming mechanism will be described separately in detail.

(2) Winding Mechanism Referring to FIG. 5, the winding mechanism guides the string around the material H to be wound and winds the tip end 6a of the rotating arm 6;
A string retainer 31 fixed to the fixed frame 1 for grasping a winding start part and a winding end part of a string to be wound.
And a string lifting member 32 which is a movable member for lifting the winding start portion of the grasped string and aligning it in the same direction as the winding end portion; And a insertion member 33 for stretching the space between the camera and a position separated by a predetermined distance from the camera. The insertion member 33 is
In order to stretch the string, it has a portion which is branched in the vertical direction and is formed in a forked shape, and is formed at the distal end of the insertion lever 35 which is a movable member.

Referring to FIG. 2, this winding mechanism allows
The following winding process is performed. As described in (1), the string R for binding is guided in advance to the tip 6 a of the rotating arm 6. The leading end of the guided string R is held in advance by being hooked on the string holder 31 as described later.

As shown in FIG. 3, the leading end of the grasped string R is used as the winding start portion R 1 of the string R, and as the rotating arm 6 rotates, the string R is pulled out from the leading end 6 a of the rotating arm 6. And
It is wound around the binding object H placed on the mounting table 2.

As shown in FIG. 4, when the rotating arm 6 rotates a predetermined number of times, for example, twice, the wound string R is gripped by the string retainer 31 at the end R2 of the winding. On the other hand, the winding start portion R1 of the wound string R is lifted by the string lifting member 32 as shown in FIG. 5, and is substantially the same as the portion between the string presser 31 of the winding end portion R2 and the object H to be tied. Aligned in the same direction. Both of the aligned winding start portion R1 and winding end portion R2 are pushed by the inserting member 33 that is advanced, and are thereby stretched together between the bifurcated portions 33a and 33b of the inserting member 33. .

In the course of winding, as shown in FIG. 3, the insertion lever 35 is advanced so as to cover the string presser 31, so that the string R is wound while avoiding the string presser 31. Upon completion, the insertion lever 35 is retracted, and the string R is hooked by the string holder 31 at the end R2 of the winding as described above, and is gripped. Thereafter, the rotating arm 6 continues to rotate to a predetermined position, and the string R is stretched between the string presser 31 and the tip 6a of the rotating arm 6,
The bridged portion R3 becomes the winding start portion R1 of the next operation.

Subsequent to the winding step, a knot forming step is performed by the following knot forming mechanism.

(3) Knot-forming mechanism Referring to FIGS. 6 and 8, the knot-forming mechanism comprises a movable body 41 which can move back and forth with respect to the portion R4 of the stretched string R.
A rotating shaft 42 rotatably supported on the movable body 41 about an axis 42 a extending in the vertical direction, a pair of beak-shaped clamp claws 43 attached to the rotating shaft 42 so as to be able to rotate integrally with the rotating shaft 42, and a clamp claw 43. A stripper 44 (see FIG. 14) for hooking a string formed in a loop shape, and a cutter 45 (see FIG. 14) for cutting the string by moving forward and backward.

The clamp claws 43 are provided in FIGS. 25 and 26.
As shown in FIG. 7, the pair of clamp pawls 43a and 43b which can be opened and closed are arranged in the direction of the axis 42a of the rotating shaft 42. One clamp claw 43a is fixed to one end of the rotating shaft 42, and one end of the other clamp claw 43b is rotatably supported on the fixed end side of the clamp claw 43a. As will be described later, the rotation of the rotation shaft 42 causes the clamp claw piece 43b to rotate, so that the clamp claw 43
Can be opened and closed to clamp the string R.

Referring to FIG. 5, during the above-mentioned winding step, the clamp pawl 43 is closed and its open / close end is moved to the movable body 41.
Waiting in the direction of entry (referred to as the “regulation position”). In addition, the movable body 41 has a portion R of the string R
4 is in the evacuation position and is waiting.

As shown in FIG. 6, the movable body 41 advances in the X direction from the retreat position, and the clamp claw 43
4 and is inserted into a space 33c formed between the forked portions 33a and 33b of the insertion member 33. With the clamp claws 43 inserted, FIG.
As shown in (2), when the insertion member 33 moves, the string portion R4 is hooked on the clamp claw 43 instead of the insertion member 33. The clamp claw 43 is rotated once so that the hooked string portion R4 does not come off so as to twist the hooked string.

Along with this rotation, the hooked string portion R4 is twisted around the clamp claw 43 to form a loop R5 that ties the clamp claw pieces 43a and 43b together (see FIGS. 8 to 11). ). At the same time, the string portion R6 near the loop R5 is clamped by the clamp claws 43 (FIG. 12).

Referring to FIG. 14, when clamp pawl 43 is clamped at string portion R6 and is directed to its restricting position, movable body 41 is moved along stripper 44 along the side end surface of clamp pawl 43. Move to the retreat position. With this movement, as shown in FIG. 15, the string loop R5 is not moved by being hooked by the stripper 44, and only the clamped portion R6 moves. As a result, the portion R6 is pulled out through the loop R5 while crossing the loop R5, thereby forming a knot (see FIG. 13).

The stripper 44 is retracted when the clamp claw 43 rotates. When the movable body 41 moves to the retreat position, the cutter 45 advances and retreats, and the winding start portion R1 and the winding end portion R near the string presser 31 are moved.
2 is cut (FIG. 14). After the cutting, when the movable body 41 is completely moved to the retreat position, the clamp claw 43 is opened, and the material to be tied H can be taken out.

The operation of each part of the knot forming mechanism and the winding mechanism is realized by the transmission mechanism 5 described in detail below.

(4) Transmission Mechanism Next, the transmission mechanism 5 will be described with reference to FIGS.

First, referring to FIG. 16, a transmission mechanism 5 includes a pulley 50 attached to an output shaft of the motor 4 and a belt 51 wound around the pulley 50 for driving the above-described components. A pulley 52, which is rotationally transmitted by a belt 51, rotates integrally with the pulley 52, and
A pinion 53 rotatably supported on the pinion 53;
And a first shaft 55 which rotates integrally with the gear 54 and is rotatably supported by the fixed frame 1.

In order to drive the rotary arm 6, the gear 60 revolves around the rotation center of the first shaft 55 and is fixed to the gear 54, the gear 61 meshing with the gear 60, and the positioning of the gear 61. And a sprocket 64 that rotates integrally with the gear 61, a chain 65 that meshes with the sprocket 64, and a sprocket 66 that is driven and transmitted by the chain 65 and rotates integrally with the rotating arm 6.

Referring to FIG. 17, the above insertion lever 3
In order to drive the cam 5, a cam 71 that rotates integrally with the first shaft 55, and a cam follower 72 that contacts the peripheral surface of the cam 71
A first lever 73 that rotatably supports the cam follower 72 at one end and is rotatably supported at the center by the fixed frame 1, and a spring 74 that biases one end of the first lever 73.
A rod 7 having one end rotatably supported by the other end of the first lever 73 and the other end rotatably supported by the insertion lever 35.
5 are provided. The insertion lever 35 is rotatably supported by the fixed frame 1 at the center thereof. The insertion member 33 is driven in the left-right direction by a predetermined amount at a predetermined timing through the above-described parts, with the rotation of the cam 71.

Referring to FIG. 18, in order to move the movable body 41 forward and backward, a bevel gear 76 that rotates integrally with the first shaft 55, a bevel gear 77 that meshes with the bevel gear 76, and a bevel gear 7
7, a second shaft 78 rotatably supported by the fixed frame 1, and a cam 79 integrally rotating with the second shaft 78.
A cam follower 80 in contact with the inner peripheral surface of the cam 79; and a second lever 81 rotatably supported at one end by the cam follower 80 and rotatably supported by the fixed frame 1 at the center.
And a rod 8 having one end rotatably supported by the other end of the second lever 81 and the other end rotatably supported by the movable body 41.
2 is provided. The movable body 41 is connected to the second shaft 78.
It is rotatably supported by the cam 79, and advances and retreats by a predetermined amount at a predetermined timing in the front-rear direction with the rotation of the cam 79.

Referring to FIG. 19, in order to drive the string lifting member 32, a rod 83 whose one end is rotatably supported by the movable body 41 and the other end of the rod 83 are rotated around the center. A string lifting lever 34 that is freely supported and one end of which is rotatably supported by the fixed frame 1 is provided. The other end of the string lifting lever 34 has a string lifting member 3
2 are formed. The string lifting member 32 includes the movable body 4
It moves up and down as 1 advances and retreats.

Referring to FIG. 20, in order to drive the cutter 45, the disk 10 is rotated integrally with the second shaft 78.
0, a roller 84 rotatably supported at a predetermined position on the disc 100, a roller 85 in contact with the roller 84, and a roller 85 rotatably supported at one end, and rotatably supported by the fixed frame 1 at the center. A third lever 86 supported, and a rod 8 rotatably supported at one end by the other end of the third lever 86
7 and the other end of the rod 87 is rotatably supported at the center,
The cutter lever 46 has one end rotatably supported by the fixed frame 1 and a manual lever 88 that rotates integrally with the cutter lever 46. A cutter 45 is formed at the other end of the cutter lever 46. The cutter 45 holds the disk 10
It moves forward and backward corresponding to a predetermined position accompanying the rotation of zero.

Referring to FIG. 21, the above-mentioned stripper 44
In order to move the cam 89, a cam 89 that rotates integrally with the second shaft 78 and a cam follower 90 that contacts the peripheral surface of the cam 89.
And a fourth lever 91 rotatably supported at one end by the cam follower 90 at one end thereof and rotatably supported at the center by the fixed frame 1, and having one end connected to the other end of the fourth lever 91. A rod 92 movably supported,
One end is pushed up by the other end of the rod 92, and a stripper lever 47 rotatably supported by the fixed frame 1 at the center thereof is provided. Stripper lever 4
The other end and the side of 7 are urged by a spring, and a stripper 44 is formed at the end on one end. Stripper 44
Moves up and down as the cam 89 rotates.

Referring to FIG. 22, the above-described clamp claw 43
And a drive transmission gear 9 meshed with the sector gear 93 and rotatably supported by the movable body 41.
4, a bevel gear 95 that rotates integrally with the drive transmission gear 94,
A bevel gear 96 that meshes with the bevel gear 95 and rotates integrally with the rotating shaft 42 is provided. The sector gear 93 has a predetermined rotation phase of the motor 4 (only the knot forming step).
, And is disposed so as to mesh with the drive transmission gear 94, and corresponds to the predetermined position accompanying the rotation of the disc 100,
3 rotates.

The sector gear 93 and the drive transmission gear 94 constitute a part of a drive transmission mechanism that selectively drives and connects the winding mechanism and the knot forming mechanism to the motor 4.

On the other hand, the transmission mechanism 5 is
When is not rotationally driven, the position of the clamp claw 43 is regulated as follows.

(5) Position Control of Clamp Claw The position control of the clamp claw 43 will be described with reference to FIGS.

Referring to FIG. 22, the transmission mechanism 5 is provided coaxially with the drive transmission gear 94 so as to be rotatable integrally with the drive transmission gear 94 for position regulation and release thereof. A regulating member 110 having a concave sliding contact surface 111 along which the disc 100 can move, and a peripheral surface of the disc 100 so as to allow rotation of the regulating member 110 in a state where the sector gear 93 and the drive transmission gear 94 are engaged. 101 is provided with a concave portion 102 formed in a part thereof.

In a state where the engagement between the sector gear 93 and the drive transmission gear 94 has been avoided, the regulating member 110 is in a state where the sliding surface 111 of the regulating member 110 is in sliding contact with the peripheral surface 101 of the disk 100 (regulating position). Regulates the rotation of the regulating member 110 itself and the drive transmission gear 94 (see FIG. 24). Also,
When the sector gear 93 and the drive transmission gear 94 are engaged with each other, the sliding contact is avoided at a position corresponding to the concave portion 102 of the disk 100 (non-restricted position) (see FIG. 23). Then, the rotation of the drive transmission gear 94 is permitted and restricted by being displaced between the non-restricted position and the restricted position.

As described above, the disc 100 and the regulating member 110
The concave portion 102 constitutes a stopper mechanism that prevents the rotation of the clamp claw 43 only when the drive transmission mechanism releases the drive connection of the knot forming mechanism.

Further, as shown in FIG.
The sliding contact surface 111 of 0 is arranged symmetrically with respect to a line connecting the center of rotation and the center of rotation of the disc 100 in an arc shape.
It is in sliding contact with the peripheral surface 101. For this reason, the regulating member 110
Can be restricted in both rotational directions.

By the way, as described above, the regulating member 110
It is conceivable that abrasion may occur during long-term use due to sliding contact with the disk 100.

For this purpose, the regulating member 110 is formed from an aluminum material, and the disc 100 is formed from a steel plate. A regulating member 11 in which the sliding surface 111 may be worn out
0 is formed of a soft material such as aluminum which is more easily worn than a hard material such as a steel plate of the disc 100, so that even if abrasion occurs, the regulating member 110 is worn and the abrasion of the disc 100 is prevented. be able to. Therefore, it is a large part,
In addition, by avoiding replacement of the disc 100 which is difficult to disassemble, by replacing the regulating member 110 which is a small part and easily replaceable
Maintenance when parts are worn can be facilitated.

The clamp claw 43 performs a predetermined rotation as described above, and also opens and closes.

(6) Opening and Closing of Clamp Claw FIG. 25 is an exploded view of the clamp claw 43, the movable body 41 and the like. FIG. 28 shows a movable body 41 and a clamp claw 43.
FIG. With reference to FIGS. 25 to 28, the transmission mechanism 5 is configured such that the roller 121 for guiding the rotational position thereof and the peripheral surface of the roller 121 contact the fixed end side of the lower clamp claw piece 43 b, thereby In order to determine the rotation position, an inclined surface 123 formed on a member 122 fixed to the movable body 41, and a concave portion provided on a part of the inclined surface 123 and in which the roller 121 corresponding to the regulation position fits. 124
And a biasing mechanism 130 for biasing the roller 121 fitted in the recess 124 into the recess 124, and a roller 125 in contact with the roller 121 corresponding to the regulation position.

The urging mechanism 130 includes a pressing member 131 rotatably supported by the movable body 41 for pressing the fitted roller 121 against the concave portion 124 and a pressing member 13.
A spring 132 is provided between the movable body 41 and the pressing member 131 so as to urge the first member 1.

When the movable body 41 is in the retracted position, the urging mechanism 130 rotates the pressing member 131 so that the urging of the pressing member 131 is released.
A contact surface 133 provided integrally with the contact member 133 and the pressing member 131 are pushed in contact with the contact surface 133 at the retracted position.
And a projection member 134 fixed to the fixed frame 1.

(7) Operation The motor 4 continuously rotates the winding step and the knot forming step during one binding operation.

During the winding step in which the winding mechanism operates, the engagement between the sector gear 93 and the drive transmission gear 4 is avoided, and the sliding contact surface 111 of the regulating member 110 at the regulating position is prevented.
The rotation of the drive transmission gear 94 and the clamp claw 43 is restricted in a state in which the sliding contact is made with the peripheral surface 101 of the disk 100.

In the knot forming step, the sector gear 93 and the drive transmission gear 94 mesh with each other,
The clamp claw 43 involved in knot formation is driven. At this time, the regulating member 110, which has been allowed to rotate by the concave portion 102 of the peripheral surface 101 of the disk 100, is once displaced from the regulating position to the non-regulating position to allow the drive transmission to the clamp claw 43, and then regulate again. Then, the rotation of the clamp claw 43 is restricted.

(8) Conclusion In the conventional tying device, a force for restricting the rotation of the clamp claw was exerted even at the initial stage of driving of the clamp claw. It was not possible to increase the size, and the clamp claw when not driven sometimes rotated by an external force.

On the other hand, according to the present embodiment, the force for restricting the rotation of the clamp claw 43 is exerted only when the clamp claw 43 is not driven, so that the torque cross of the motor 4 is generated at all. Without this, the regulating force can be significantly increased. Therefore, since the rotation of the clamp claw 43 during non-driving can be reliably prevented,
Even if an external force acts on the clamp claw 43, the clamp claw 43 does not rotate due to the external force, and the clamp claw 43 is held at the regulated position, and there is no possibility that a malfunction of biting occurs.

Further, since the concave sliding surface 111 comes into surface contact with the peripheral surface 101 of the disk 100, the impact force when the sliding surface 111 comes into contact with the peripheral surface 101 can be reduced. As a result, high durability can be obtained.

The biasing of the roller 121 is for opening and closing the clamp claw 43 and is not used for regulating the direction of the clamp claw 43. Therefore, any biasing force capable of closing the clamp claw 43 is sufficient. The torque loss can be reduced by reducing the urging force.

It is to be noted that the regulating member 110 of the embodiment of the present invention has at least two rolls which can roll on the peripheral surface 101 of the disk 100 as shown in FIG. The rolling elements 115 may be provided, and the rotation of the drive transmission gear 94 may be restricted in a state where the rolling elements 115 are rolled on the peripheral surface 101 of the disk 100. In this case, since the rolling element 115 can roll on the peripheral surface 101 of the disk 100, the regulating member 110
The rotation resistance of the disc 100 can be reduced as compared with the case where the disc 100 slides.

In addition, various design changes can be made without changing the gist of the present invention.

[0071]

According to the first aspect of the present invention, the following effects can be obtained. That is, even in the early stage of driving of the clamp pawl, in the conventional one which exerted the force for restricting the rotation of the clamp pawl, in order to avoid the torque crossing of the motor, the restricting force could not be increased so much. In some cases, the clamp claw when not driven is rotated by an external force. On the other hand, in the present invention, only when the clamp pawl is not driven, the force for restricting the rotation of the clamp pawl is exerted, so that the restricting force is significantly reduced without any torque crossing of the motor. Can be bigger. Therefore, the rotation of the clamp pawl during non-driving can be reliably prevented.

Therefore, when the connection of the knot forming mechanism to the motor is released, the clamp pawl can be strongly and reliably restricted to a predetermined position. Even if an external force acts on the clamp pawl, the clamp pawl is rotated by the external force. In this case, the clamp claw is held in a predetermined direction, and there is no possibility that a problem of biting occurs.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the concave sliding contact surface of the regulating member comes into surface contact with the peripheral surface of the disk, thereby reducing the contact time. Can reduce the impact force, so that high durability can be obtained.

According to the third aspect of the invention, in addition to the effect of the second aspect of the present invention, the rolling element rolls on the peripheral surface of the disk, so that the regulating member slides on the disk. Thus, the rotational resistance of the disk can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a string binding device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a winding mechanism of the above-described string binding device, showing a winding operation.

FIG. 3 is a perspective view of a main part of a winding mechanism showing a winding operation following FIG. 2;

FIG. 4 is a perspective view of a main part of a winding mechanism showing a winding operation following FIG. 3;

FIG. 5 is a perspective view of a main part of a winding mechanism showing a winding operation following FIG. 4;

FIG. 6 is a perspective view of a main part of a knot forming mechanism of the above-described string tying device, showing a knot forming operation.

FIG. 7 is a perspective view of a main part of a knot forming mechanism showing a knot forming operation following FIG. 6;

FIG. 8 is a perspective view of a main part of the knot forming mechanism showing a knot forming operation following FIG. 7;

FIG. 9 is a perspective view of a main part of the knot forming mechanism showing a knot forming operation following FIG. 8;

FIG. 10 is a perspective view of a main part of the knot forming mechanism showing a knot forming operation following FIG. 9;

FIG. 11 is a perspective view of a main part of the knot forming mechanism showing a knot forming operation following FIG. 10;

FIG. 12 is a perspective view of a main part of a knot forming mechanism showing a knot forming operation following FIG. 11;

FIG. 13 is a perspective view of a main part of the knot forming mechanism showing a knot forming operation following FIG. 12;

FIG. 14 is another perspective view of the main part of the knot forming mechanism showing the knot forming operation following FIG.

FIG. 15 is a perspective view of a main part of a knot forming mechanism showing a knot forming operation following FIG. 14;

FIG. 16 is a first perspective view of a main part of a transmission mechanism of the above-described string binding device.

FIG. 17 is a second perspective view of a main part of the transmission mechanism.

FIG. 18 is a third perspective view of a main part of the transmission mechanism.

FIG. 19 is a fourth perspective view of a main part of the transmission mechanism.

FIG. 20 is a fifth perspective view of a main part of the transmission mechanism.

FIG. 21 is a sixth perspective view of a main part of the transmission mechanism.

FIG. 22 is a seventh perspective view of a main part of the transmission mechanism.

FIG. 23 is a side view of the disc, the regulating member, the sector gear, and the drive transmission gear, showing an operation in a non-regulated position.

FIG. 24 is a side view of the disc, the regulating member, the sector gear, and the drive transmission gear, showing an operation at a regulated position.

FIG. 25 is an exploded view of the movable body near the clamp pawl.

FIG. 26 is a side view of the clamp claw in an opened state.

FIG. 27 is a side view of the clamp claw in a closed state.

FIG. 28 is a perspective view of a movable body near a clamp claw.

FIG. 29 is a side view of a disc, a regulating member, a rolling element, a sector gear, and a drive transmission gear according to another embodiment, showing an operation at a regulated position.

[Explanation of symbols]

 Reference Signs List 1 fixed frame 2 mounting table 4 motor 41 movable body 42 rotating shaft 42a axis of rotating shaft 43 clamp claw 93 sector gear (drive transmitting mechanism) 94 drive transmitting gear (drive transmitting mechanism) 100 disk (stopper mechanism) 101 peripheral surface 102 recess (Stopper mechanism) 110 Control member (stopper mechanism) 111 Sliding contact surface 115 Rolling element

Claims (3)

[Claims] 1. A fixed frame, a mounting table supported by the fixed frame, on which the object to be tied is mounted, and a string wound around the object to be tied mounted on the mounting table, A winding mechanism that stretches the winding start portion and the winding end portion in the same direction, and stretches between the object to be tied and a position that is separated from the object by a predetermined distance, and is capable of moving back and forth with respect to the stretched portion. A movable body supported by a fixed frame, a rotating shaft rotatably supported by the movable body, and a pair of beak-shaped clamp claws mounted side by side in the axial direction of the rotating shaft so as to be integrally rotatable; Along with the rotation of the shaft, a middle part of the stretched portion is hooked and twisted by a clamp claw to form a loop that binds both clamp claws, and a portion near the loop is clamped by the clamp claw. A knot forming mechanism for forming a knot by pulling out a portion clamped through the loop while crossing the loop with the movement of the movable body, and a single motor for driving the winding mechanism and the knot forming mechanism A drive transmission mechanism that selectively drives and connects the winding mechanism and the knot forming mechanism to the motor, and only when the drive transmission mechanism releases the drive connection of the knot forming mechanism. And a stopper mechanism for preventing rotation of the clamp claw. 2. The string bundling device according to claim 1, wherein the drive transmission mechanism is rotatably supported by a fixed frame, and is rotatably supported by the fixed shaft. A sector gear that is supported and is always driven to rotate by a motor and meshes with the drive transmission gear only in a step of forming a knot; the stopper mechanism is a disk that is always driven to rotate by the motor; It is provided so as to be integrally rotatable coaxially with the drive transmission gear,
A regulating position that has a concave sliding contact surface that can follow the peripheral surface of the disc, and regulates rotation of itself and the drive transmission gear in a state where the sliding contact surface is in sliding contact with the peripheral surface of the disc. A restricting member that is displaced to a non-restricting position for avoiding the sliding contact, and is formed on a part of a peripheral surface of the disk, and allows rotation of the restricting member in a state where the sector gear and the drive transmission gear mesh with each other. A string tying device comprising: 3. The string bundling device according to claim 2, wherein the regulating member has at least two rolling elements capable of rolling on the peripheral surface of the disk instead of the sliding contact surface. A stringing device that restricts rotation of the drive transmission gear in a state where these rolling elements are rolled on the peripheral surface of the disk.