JPH11155342A - Clutch device of culm binder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch device of a culm binder capable of surely stopping the binding motion. SOLUTION: A 1st restriction member 12b is attached to an operation arm 12 to couple a one-turn clutch C by shifting against the force of a spring 11 for setting a culm binding force and releasing the engagement with a clutch claw 8 and, after restoring to a prescribed position before completing the rotation of the one-turn clutch, disconnect the one-turn clutch by engaging with the clutch claw. A 2nd restriction member 19 to restrict the oscillation of the operation arm by coming into contact with the 1st restriction member during the period from the restoration of the operation arm to the prescribed position to the engagement of the arm with the clutch claw is attached to the follower rotation member 6 of the one-turn clutch. The 2nd restriction member is provided with a roller 21 on its outer circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stalk-rod focusing pressure setting spring which is displaced in a swinging manner against a biasing force thereof, and when the displacement reaches a predetermined amount, the engagement with the clutch pawl is released. A stem and rod provided with an operation arm for engaging the rotation clutch and restoring to a predetermined posture before the rotation operation of the one-rotation clutch is completed, and then engaging with the clutch claw to perform a disengagement operation of the one-rotation clutch. The present invention relates to a clutch device of a binding machine.

[0002]

2. Description of the Related Art A clutch device for a stalk-and-stick tying machine constructed as described above is disclosed in Japanese Utility Model Laid-Open No. 59-150228. In this stem-and-rod binding machine, the door that closes the binding space and the operation arm of the one-turn clutch are mechanically linked,
The convergence pressure of the stem rods, which are constantly driven into the binding space by the packer, causes the operating arm to swing and displace via the door, and when this displacement reaches a predetermined amount, the one-turn clutch is engaged and operated. The binding operation is started.

[0003] When the binding operation is started, the operation arm is temporarily freed by the action of the driven cam plate provided in the one-rotation clutch, and the urging force of the stem rod focusing pressure setting spring against the door is no longer applied, and the door is retracted. Then, the binding space is opened, and the tying rod is released out of the binding space. When the release of the stem and rod is completed, the operation arm is restored to the predetermined position for disengaging the one-rotation clutch again by the action of the driven cam plate, and the clutch claw of the one-rotation clutch is engaged with the operation arm in this position. The binding operation stops.

[0004]

However, in a situation where the binding operation of the clutch device is performed at a very high speed in order to improve the working efficiency, even after the operation arm is restored to the predetermined posture as described above. Since the dynamic inertia force of the operating arm and the door associated therewith deflects the stem rod focusing pressure setting spring, the operating arm is not stabilized in a predetermined posture. As a result, there has been a problem that the binding operation cannot be stopped without being overrun and engaged with the clutch claw of the one-rotation clutch, and the clutch claw is continued as it is.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a clutch device for a stem-and-rod binding machine in which the above-mentioned problems are improved and the binding operation is reliably stopped. In addition to the provision of the second restricting body, which prevents the operation arm from swinging by contacting the first restricting body between the time when the operating arm is restored to the predetermined posture and the time when the operating arm is engaged with the clutch pawl, It is provided on the driven rotation member. In addition, it is preferable that the second regulating body is provided with a roller on its outer periphery in order to improve its own durability.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional plan view of a one-rotation clutch in a stopped state, FIG. 2 is a cross-sectional plan view of a one-rotation clutch immediately after being operated by an operation arm, and FIG. 3 is a one-rotation clutch when the operation arm is in a free state. FIG. 4 is a plan sectional view of a one-rotation clutch when the operation arm is restored to a predetermined posture. FIG. 5 is a plan sectional view of a one-rotation clutch immediately before the operation arm is engaged with the clutch pawl.
FIG. 6 is a laterally developed sectional view showing a main part of the stem-and-rod tying machine.

As shown in FIG. 6, a single-rotation clutch C provided in the stem-and-rod binding machine engages with a transmission gear 2 of an input shaft 1 and rotates freely on a needle shaft 3 which constantly rotates. A driving projection 5 provided thereon, a driven cam plate (corresponding to a rotating member) 6 engaged with the needle shaft 3 via a key, and a driven cam plate 6
The clutch pawl 8 slidably mounted on the side surface of the shaft 7 around the support shaft 7, the driven projection 9 formed on the free end side of the clutch pawl 8, and the pawl 8a of the clutch pawl 8 approach the needle shaft 3 (in other words, For example, the driven protrusion 9 is separated from the needle shaft 3)
A torque spring (not shown) on the support shaft 7 oscillatingly biasing in the direction, the free end portion 12c is engaged with the pawl portion 8a of the clutch claw 8 by being freely pivoted and supported by the packer shaft 10, and the stem stick is formed. An operating arm 12 on which a converging pressure setting spring 11 acts, a bracket 14 having a receiving portion of the spring 11 and a roller 13 which is also rotatably supported by the packer shaft 10 and comes into contact with an outer peripheral edge 6a of the driven cam plate 6; A long hole 1 of the arm 12 is attached to the door shaft 15 so as to swing the operation arm 12.
The arm 16 is provided with an arm 16 engaged with the pin 2a via a pin 16a.

When the one-rotation clutch C is in the state shown in FIG. 1, the roller 13 of the bracket 14
And the biasing force of the stem rod converging pressure setting spring 11 maintains the operation arm 12 in the predetermined posture shown in the drawing, and the free end portion 12c engages with the claw portion 8a of the clutch claw 8, whereby The driven protrusion 9 of the clutch pawl 8 approaches the needle shaft 3 and is displaced from the rotation trajectory of the drive protrusion 5 of the idle gear 4, so that the needle shaft 3 is not driven and the binding operation is stopped.

The door 1 attached to the end of the door shaft 15
On the other hand, when the convergence pressure of the stalk rod which is scraped into the binding space by the packer increases, the arm 16 swings in the direction of arrow A as shown in FIG. When the displacement amount reaches a predetermined amount while swinging and displacing in the direction of arrow B against the urging force of the rod focusing pressure setting spring 11, the free end portion 12c and the claw portion 8 of the clutch claw 8 as shown in the figure.
The engagement with a is released. As a result, the driven protrusion 9 of the clutch claw 8 swings in the direction of arrow C by the action of a torque spring (not shown) and is positioned on the rotation trajectory of the drive protrusion 5, and the drive protrusion 5 comes into contact with the driven protrusion 9. In this state, the rotation of the driven cam plate 6 is started, and the one-rotation clutch C is engaged. As a result, the bundling operation is started by operating the needle 18 linked to the end of the needle shaft 3, and a predetermined amount of the stem rod received by the door 17 is bound.

In the latter half of the rotation of the one-rotation clutch C, as shown in FIG.
Is a fan-shaped recess 6 formed on the outer peripheral edge 6a of the driven cam plate 6.
b, the operation arm 12 temporarily becomes free,
Since the urging force of the stem / rod focusing pressure setting spring 11 against the door 17 is eliminated, the door 17 is retracted, the binding space is opened, and the binding stem / rod is discharged out of the binding space.

When the tying rod is released, the roller 13 of the bracket 14 rides on the outer peripheral edge 6a of the driven cam plate 6 again as shown in FIG.
Is restored to the predetermined position when the one-turn clutch C is disengaged. Thereafter, the claw portion 8 a of the clutch claw 8 rotating together with the driven cam plate 6 is moved to the free end portion 12 of the operation arm 12.
c, the binding operation should stop. However, according to the conventional operation arm, the swinging displacement in the direction of arrow B shown in FIG. 1 is free via the focusing pressure setting spring. Is bent by the dynamic inertial force of the operating arm and the doors associated therewith, the operating arm cannot maintain the predetermined posture, causing the above-mentioned problem.

Therefore, in the present invention, the operation arm 12
And a second regulating portion 19 provided on a side surface of the driven cam plate 6. As shown in FIG. 5, the second regulating portion 19
During the period from when the driven cam plate 6 is restored to the predetermined posture to when the pawl portion 8a of the clutch pawl 8 is engaged with the free end portion 12c (clutch disengagement starts).
It is provided so as to be located on the swing locus of the first regulating body 12b that swings together. Therefore, immediately before the free end portion 12c of the operation arm 12 engages with the claw portion 8a of the clutch claw 8, even if the first restricting body 12b attempts to overrun in the direction of arrow B from the predetermined posture as described above. Since the operating arm 12 is kept in a predetermined posture because of contact with the restricting portion 19, the free end portion 12c is surely connected to the claw portion 8a of the clutch claw 8.
And the operation of the one-rotation clutch C is stopped.

The second restricting portion 19 may be constituted by a projection such as a pin, which is implanted on a side surface of the driven cam plate 6, but abrasion may occur at a portion where the first restricting body 12b repeatedly contacts. In order to easily prevent such an obstacle, as described in the embodiment of the present invention, the roller 21 can be freely rolled on the pin 20 implanted on the side surface of the driven cam plate 6. It is preferable that the first arm 12b of the operation arm 12 is brought into contact with the outer peripheral surface of the roller 20.

[0014]

According to the first aspect of the present invention, it is only necessary to add an extremely simple part such as providing the first regulating body on the operating arm and providing the second regulating body on the driven rotary member of the one-rotation clutch. The operation arm can be reliably maintained in a predetermined posture at the time of starting the clutch disengagement, and the binding operation by the one-rotation clutch can be reliably stopped, so that the binding performance of the stem-and-rod binding machine can be improved. . Moreover,
Since the second restricting member comes into contact only when the operating arm swings after restoring to the predetermined posture, no excessive force acts on the second restricting member. The device could be provided at low cost.

Further, according to the second aspect, it is possible to prevent the wear of the second restricting body from being promoted, thereby improving the durability of the clutch device.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a one-rotation clutch in a stopped state.

FIG. 2 is a cross-sectional plan view of the one-rotation clutch immediately after an on-operation by an operation arm.

FIG. 3 is a plan sectional view of a one-rotation clutch when an operation arm is in a free state.

FIG. 4 is a plan sectional view of the one-rotation clutch when the operation arm is restored to a predetermined posture.

FIG. 5 is a plan sectional view of the one-rotation clutch immediately before the operation arm engages with the clutch pawl.

FIG. 6 is a side developed sectional view showing a main part of the stem and rod binding machine.

[Explanation of symbols]

 C Single-rotation clutch 6 Follower rotating member (follower cam plate) 8 Clutch pawl 11 Spring for setting stem and rod focusing pressure 12 Operating arm 12b First regulating body 19 Second regulating body 21 Roller

Claims (2)

[Claims] An oscillating displacement occurs against the urging force of a stem-rod focusing pressure setting spring. When this displacement reaches a predetermined amount, engagement with a clutch claw is released and a one-turn clutch is engaged. And an operation arm for restoring to a predetermined posture before the rotation operation of the one-rotation clutch is completed, and then engaging with the clutch claw to perform a disengagement operation of the one-rotation clutch. And a second restriction that prevents the operation arm from swinging by contacting the first restriction body between the time when the operating arm is restored to the predetermined position and the time when the operation arm is engaged with the clutch pawl. A clutch device for a stem-and-rod tying machine, wherein the body is provided on a driven rotating member of a one-turn clutch. 2. The clutch device according to claim 1, wherein the second restricting body has a roller on an outer periphery thereof.