JP2001021014A - Chain tension adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complete a stable chain tension adjusting device for a lift-up chain for binders. SOLUTION: In a chain tension adjusting device which is provided with a chain laid over between a driving wheel and an idler wheel 5, a guide cylinder 9 connected to an idler wheel holder 7 for supporting the idler wheel 5 and abutting-restricting the idler wheel holder 7 so that it can freely advance or retract, a stopper 10 for restricting the retreating position of the guide cylinder 9, and a torsion spring 13 for energizing the guide cylinder 9 in a specified direction of turning movement, and in which the guide cylinder 9 is turned through an inclined guide surface formed at a stopper-abutting part of the guide cylinder 9 based on the energizing force of the torsion spring 13, and thus the tension of a chain can be adjusted by advancing or retracting movement of the guide cylinder 9, the torsion spring 13 is mounted so that it can move together with the guide cylinder 9 or it cannot be moved with respect to the guide cylinder 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain tension adjusting device provided in a binder raising device or the like, and more particularly to a chain drive adjusting device provided with a chain drive driving wheel and a floating wheel holder. The present invention relates to a chain tension adjusting device that is adjusted by abutment of an inclined guide surface of a guide cylinder that restricts contact with a stopper and a stopper that restricts a retreat position of the guide cylinder.

[0002]

2. Description of the Related Art Conventionally, a chain tension adjusting device for adjusting the axial distance between a driving wheel and an idler wheel of a chain drive by urging the idler wheel holder which is movable forward and backward in a forward direction with a compression spring. Is already known.

[0003]

In a chain tension adjusting device for urging the center distance between a driving wheel and an idler wheel of a chain drive in a forward direction by a compression spring, a large tension acts on the chain. In some cases, the center distance was reduced, and the chain drive became unstable.

In view of the above, instead of adjusting the distance between the shafts via a compression spring, the present invention regulates the inclined guide surface of the guide cylinder for abuttingly restricting the idle wheel holder to advance and retreat, and regulates the retreat position of the guide cylinder. An object of the present invention is to propose a chain tension adjusting device which is adjusted by contact with a stopper, acts only in the forward direction, and does not act in the backward direction.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in claim 1, a chain (3) wound between a driving wheel and an idler wheel (5) is provided. A guide tube (9) connected to an idle wheel holder (7) for supporting the idle wheel (5), for restricting the idle wheel holder (7) to reciprocate; and a retracted position of the guide tube (9). And a torsion spring (13) for urging the guide cylinder (9) in a predetermined rotation direction.
Based on the biasing force of 3), the guide cylinder (9) is rotated via an inclined guide surface (9a) formed at a stopper contact portion of the guide cylinder (9), and the guide cylinder (9) is rotated. In a chain tension adjusting device in which the tension of a chain (3) can be adjusted by moving forward and backward, the torsion spring (13) is movable together with the guide cylinder (9) or immovably mounted on the guide cylinder (9). According to claim 2, the torsion spring (1
3) locking one end of the guide tube (9) with the guide tube (9), and movably fitting the other end of the guide tube (14) extending from the idle wheel holder (7) in the reciprocating direction. 3
The chain (3) wound between the driving wheel and the idler wheel (5) is connected to an idler wheel holder (7) supporting the idler wheel (5), and the idler wheel holder (7) is A guide cylinder (9) for abuttingly regulating the guide cylinder (9), a stopper (10) for regulating a retreat position of the guide cylinder (9), and a torsion spring for urging the guide cylinder (9) in a predetermined rotation direction (13), and the guide cylinder (9) is moved through the inclined guide surface (9a) formed on the stopper contact portion of the guide cylinder (9) based on the urging force of the torsion spring (13). The torsion spring is formed of a double torsion spring (13a) in a chain tension adjusting device which is capable of rotating and adjusting the tension of the chain (3) by moving the guide tube (9) forward and backward. Both ends of the spring (13a) are locked on the fixed base (15) side, and are extended in the middle reciprocating direction. Line section (13b), and sandwiched hook section provided (20) to said guide tube (9),
The above-mentioned problem has been solved.

(Function) According to the above structure,
Chain (3) wound between drive wheel and idler wheel (5)
Rotates the guide cylinder (9) in a predetermined direction along the inclined guide surface (9a) formed on the stopper contact portion of the guide cylinder (9) by the biasing force of the torsion spring (13); A constant tension is always maintained to prevent the guide cylinder (9) from rotating in the reverse direction.

According to a second aspect of the present invention, one end of the torsion spring (13) is engaged with the guide cylinder (9), and the other end is extended from the idler wheel holder 7 in the guide pipe (14).
The function of the torsion spring (13) can be sufficiently exhibited without receiving an unreasonable load at the locking point by movably fitting the torsion spring.

According to a third aspect of the present invention, the torsion spring is formed of a double torsion spring (13a), and both ends of the double torsion spring (13a) are locked to the fixed base (15) side, so that the torsion spring is moved in the middle direction. Since the extended straight portion (13b) is sandwiched between the hook portions (20) provided on the guide tube (9), the torsion spring (13a) is not subjected to an excessive load at the locking point. Functions can be fully exhibited.

Note that the reference numerals in parentheses above are for comparison with the drawings, but do not limit the configuration of the present invention at all.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a binder 1 for cutting and bundling stems and stems, and 2 is a cutting section mounted on a front portion.

FIG. 2 is a perspective sectional view of a main part of the present invention, wherein 5 is an idle wheel, 7 is an idle wheel holder, 9 is a guide cylinder, 1
0 is a stopper, and 13 is a torsion spring.

FIG. 3 is a sectional view of a main part of the present invention,
(A) is a front view of a state before the torsion spring 13 operates.
(B) is a side view of (a), (c) is a side view of a state after the torsion spring 13 is operated.

The idler wheel 5 is supported by an idler wheel holder 7 formed substantially in the shape of a gate when viewed from the side. A guide shaft 7a is provided to guide in the forward and backward directions.

At the upper end of the idler wheel holder 7, a guide pipe 14 is provided at a position eccentric from the center line in the reciprocating direction.
Are movably extended with respect to the support plate 15b, and serve to prevent the idler wheel holder 7 from rotating.

The guide cylinder 9 is, as shown in FIG.
The upper and lower support plates 15a and 15b are rotatably supported by the upper and lower support plates 15a and 15b. The lower end surface of the upper and lower support plates 15a and 15b comes into contact with the idler wheel holder 7 to restrict the retreat thereof. Retreat of the guide cylinder 9 itself is restricted.

A torsion spring 13 is provided on the outer periphery of the guide cylinder 9.
3B and 3C, one end of the torsion spring 13 is locked by a hook 12 provided on a part of the outer periphery of the guide cylinder 9 and the other end is the guide pipe. 14 is fitted and supported so as to be able to move forward and backward. Accordingly, the torsion spring 13 exerts a torsional biasing action on the guide cylinder 9, but can move integrally with the guide cylinder 9 in the forward and backward directions.

When a double torsion type double torsion spring 13a is used instead of the torsion spring 13, FIG.
As shown in (a) and (b), a straight portion 13b extending in the middle advance / retreat direction with both ends of the torsion spring 13a locked to the fixed base 15 side is hooked on the guide cylinder 9. The double torsion spring 13a exerts a torsional urging action on the guide cylinder 9 because it is sandwiched between the guide cylinders 20, but is immovably fixed in the reciprocating direction, and only the guide cylinder 9 moves.

A spiral inclined guide surface 9a is formed on the upper end surface of the guide cylinder 9 which comes into contact with the stopper 10 to guide the guide cylinder 9 rotating in the biasing direction of the torsion spring 13 in the forward direction. ing. That is, the guide cylinder 9 urged by the torsion spring 13 is guided by the inclined guide surface 9a and presses the idler wheel holder 7 in the forward direction, thereby raising the chain 3 and always applying an appropriate tension.

In addition, since the inclination angle of the inclined guide surface 9a is set to be relatively small, it has a function of preventing the guide cylinder 9 from rotating in the reverse direction. Is designed not to retreat.

Since the stopper 10 is screwed with a nut fixed to the fixed base 15, the initial contact position between the inclined guide surface 9a and the stopper 10 can be adjusted by rotating the stopper 10. I have.

An elevating chain 3 is wound between the driving wheel and the idler wheel 5 of the mowing unit 2, and a plurality of elevating claws 4 are mounted on the chain 3 so as to be able to undulate.

The raising claw 4 stands up on the rising side of the chain 3 to raise the stem, but is folded and accommodated in the case on the lower side.

The U-shaped rubber plate 2 as shown in FIGS.
1 is provided inside the case to alleviate the impact with the rotating raising claw 4, and as shown in FIGS. 6A and 6B, the buffer rubber pipe 22 can be simply attached with the mounting pin 23. it can.

Next, the operation of this embodiment will be described.

According to the first aspect, the chain 3 wound between the driving wheel and the idler wheel 5 has a torsion spring 13.
With the urging force of the above, the guide cylinder 9 is rotated in a predetermined direction along the inclined guide surface 9a formed at the stopper contact portion of the guide cylinder 9, and always maintains a constant tension, and
It serves to prevent the guide cylinder 9 from rotating in the reverse direction.

According to a second aspect of the present invention, one end of the torsion spring 13 is engaged with the guide cylinder, and the other end is movably fitted into a guide pipe 14 extending from the idler wheel holder 7 in the reciprocating direction. Thus, the function of the torsion spring 13 can be sufficiently exhibited without receiving an excessive load on the locking point.

According to a third aspect of the present invention, the torsion spring is formed of a double torsion spring 13a, and both ends of the double torsion spring 13a are locked to the fixed base 15 side, and a linear portion extending in the middle advance / retreat direction. 18a is connected to a hook portion 20 provided on the guide cylinder 9.
Therefore, the function of the torsion spring 13a can be sufficiently exhibited without receiving an excessive load on the locking point.

[0029]

According to the present invention, the structure and operation of the present invention are adjusted by the contact between the inclined guide surface of the guide cylinder for restricting the idle wheel holder so as to be able to move forward and backward and the stopper for restricting the retraction position of the guide cylinder. A stable chain tension adjusting device that acts only in the forward direction and does not act in the reverse direction has been completed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a binder.

FIG. 2 is a perspective sectional view of a main part of the embodiment of the present invention.

FIG. 3 is a sectional view of a main part of the embodiment of the present invention,
(A) is a front view before a spring operation, (b) is a side view before a spring operation, and (c) is a side view after a spring operation.

4A and 4B are side views of a main part of the embodiment of the present invention using a double torsion spring, wherein FIG. 4A is a side view before a spring is actuated, and FIG.
FIG. 4 is a side view after a spring is operated.

FIGS. 5A and 5B are examples of a shock absorber when the raising claws are folded down, wherein FIG. 5A is a perspective view and FIG. 5B is a plan view.

FIGS. 6A and 6B are examples of a shock absorber when the raising claw is folded down, wherein FIG. 6A is a functional diagram, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Binder 3 Raising claw 5 Idle wheel 7 Idle wheel holder 9 Guide cylinder 10 Stopper 13 Torsion spring

Claims (3)

[Claims] A guide tube connected to a idler wheel holder supporting the idler wheel and for restricting the idler wheel holder to move forward and backward; A stopper that regulates a retreat position of the guide cylinder; and a torsion spring that urges the guide cylinder in a predetermined rotation direction. The torsion spring is formed at a stopper contact portion of the guide cylinder based on an urging force of the torsion spring. A chain tension adjusting device that rotates the guide cylinder through the inclined guide surface and adjusts the tension of the chain by moving the guide cylinder forward and backward, wherein the torsion spring is movable together with the guide cylinder or the guide. A chain tension adjusting device, which is immovably mounted on a tube. 2. An end of the torsion spring is engaged with the guide cylinder, and the other end is movably fitted into a guide pipe extending from the idler wheel holder in the advancing / retreating direction. The chain tension adjusting device according to claim 1. A guide tube connected to a idler wheel holder supporting the idler wheel and for restricting the idler wheel holder to move forward and backward; A stopper that regulates a retreat position of the guide cylinder; and a torsion spring that urges the guide cylinder in a predetermined rotation direction. The torsion spring is formed at a stopper contact portion of the guide cylinder based on an urging force of the torsion spring. A chain tension adjusting device that rotates the guide cylinder through the inclined guide surface and adjusts the tension of the chain by moving the guide cylinder forward and backward, wherein the torsion spring is formed of a double torsion spring; Characterized in that both ends of the heavy torsion spring are locked to the fixed base side, and a linear portion extending in the middle reciprocating direction is sandwiched between hook portions provided on the guide cylinder. Adjustment device.