JPH11127665A - Chain tension controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the backward movement of the idler wheel due to a large load in no need of frequently repeated adjustments of the stopper position corresponding to the chain elongation, when the chain tension is controlled based on the forward and backward movements of the idler wheel. SOLUTION: The idler wheel holder 10 is guided to the chain tension controller 10 so that the holder may be freely movable back and forth and the controller 10 is equipped with the guide cylinder 18 contacting with the idler wheel holder 16 to regulate the backward movement of the holder 16, with the guide cylinder holder 19 rotatably and movably supporting the guide cylinder 18, with the stopper 20 contacting with the guide cylinder 18 to regulate its backward movement and with the twisted coil spring 21 energizing the guide cylinder 18 in the prescribed rotation direction. Simultaneously, an inclined guide face 18a is formed at the part contacting with the stopper of the guide cylinder 18, that guides the guide cylinder 18 rotating in the prescribed direction to the forward movement direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a chain tension adjusting device provided in a binder raising device or the like.

[0002]

2. Description of the Related Art Generally, this kind of chain tension adjusting device is
The tension of the chain suspended between the driving wheel and the idler wheel is adjusted based on the forward / backward movement of the idler wheel. Since the chain is configured to be urged, when a large load is applied to the chain, the idler wheel retreats greatly against the urging force of the compression spring, and there is a disadvantage that the chain is loosened.

[0003]

Therefore, it has been proposed to provide a stopper for restricting the retreat range of the idle wheel holder. However, since the idle wheel holder advances in accordance with the elongation deformation of the chain, the idle wheel holder is provided. In order to restrict the backward movement of the chain, it was necessary to frequently adjust the stopper position according to the extension of the chain.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve these problems in view of the above circumstances, and is suspended between a driving wheel and an idler wheel. A chain tension adjusting device for adjusting the tension of a chain based on the advance / retreat movement of an idler wheel, wherein the chain tension adjuster guides an idler wheel holder that supports an idler wheel so as to be able to advance and retreat, and retracts the idler wheel holder. , A guide tube holder that supports the guide tube so as to be able to advance and retreat and rotate, a stopper that restricts the guide tube from retracting, and urges the guide tube in a predetermined rotation direction. A torsion spring is provided, and an inclined guide surface is formed in a stopper contact portion of the guide cylinder for guiding the guide cylinder rotating in a predetermined direction in the forward direction. That is, since the idle wheel holder supporting the idle wheel is pressed in the forward direction by the guide cylinder urged in the rotating direction, if the inclined guide surface of the guide cylinder is set to an appropriate angle, the guide cylinder has a reverse rotation preventing function. (Equivalent to the worm gear reverse rotation prevention principle). Therefore, the retraction of the idler wheel holder due to a large load can be restricted without frequently performing the stopper position adjustment according to the elongation of the chain. As a result, the adjustment of the chain tension can be substantially automated. Further, the stopper is configured to be adjustable in position in the advancing and retreating direction of the guide cylinder. That is, the initial contact position between the inclined guide surface and the stopper can be easily adjusted, and when the guide stroke of the inclined guide surface is short, the stopper position is adjusted according to the elongation of the chain (adjustment frequency is (Less than before)
can do.

[0005]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a binder for cutting and bundling stems and stems.
In front of the traveling wheels 2, there is provided a cutting unit 3 for cutting and bundling stems and stems, and behind the traveling wheels 2, an operation handle 4, an engine 5, and a transmission case 6 are provided. I have.

The cutting unit 3 includes a divider 7 for weeding the stem, a raising device 8 for raising the stem, a cutting blade device 9 for cutting the stem of the stem, and a binding device for binding the cut stem ( (Not shown). The raising device 8 provided with the chain tension adjusting device 10 of the present invention includes the driving wheel 12 and the idler wheel 13 at the upper and lower positions of the raising case 11 and the space between the drive wheel 12 and the idler wheel 13. Raising chain 15 in which a plurality of raising claws 14 are pivotally mounted so as to be able to undulate.
On the raising side of the raising chain 15, the raising claws 14 are erected to raise the stems, while on the lower side, the raising claws 14 are lowered and raised to be accommodated in the case 11. Each of these basic configurations is the same as the conventional one.

Reference numeral 16 denotes an idler wheel holder for rotatably holding the idler wheel 13. The idler wheel holder 16 has a substantially rectangular shape in side view so as to support an idler shaft 17 at a lower end thereof. The upper end portion has a guide tube 18 to be described later.
An advancing / retracting guide shaft 16a which is fitted into an inner peripheral portion of the advancing and retracting;
A detent shaft 16b that fits into a detent hole 19a of a guide cylinder holder 19 to be described later so as to be able to move forward and backward so as to stop the idling wheel holder 16 from being integrally protruded is provided.

The guide tube 18 does not allow the idle wheel holder 16 to freely advance and retreat, but restricts the backward movement of the idle wheel holder 16 at its lower end surface. The guide tube holder 19 fixed to the guide tube holder 19 is supported so as to be able to advance and retreat and rotate freely in a guide hole 19b, and is restricted from retreating based on contact with a stopper 20 described later.

Reference numeral 21 denotes a torsion coil spring provided on the outer peripheral portion of the guide tube 18. One end of the torsion coil spring 21 is locked by the guide tube holder 19, and the other end is connected to the guide tube 18. Guide tube 1
8 in a predetermined rotation direction.

The guide cylinder 18 which contacts the stopper 20
A spiral inclined guide surface 18a for moving and guiding the guide cylinder 18 rotating in the biasing direction of the torsion coil spring 21 in the forward direction is formed at the upper end of the torsion coil spring 21. That is, since the guide cylinder 18 urged by the torsion coil spring 21 presses the idler wheel holder 16 in the forward direction by the guide of the inclined guide surface 18a, it is possible to maintain the pulling chain 15 in an appropriate tension state, In addition, since the inclination angle (lead angle) of the inclined guide surface 18a is set relatively small and the guide cylinder 18 is provided with a reverse rotation preventing function (equivalent to the principle of preventing the reverse rotation of the worm gear), the idle wheel holder based on a large load is used. The backward movement of the chain 16 can be regulated without frequent adjustment of the stopper position according to the extension of the chain 15. Reference numeral 18b denotes a rotation restricting projection that contacts the stopper 20 at the upper end position of the inclined guide surface 18a and restricts the rotation of the guide cylinder 18 further.

On the other hand, the stopper 20 is attached to the guide cylinder holder 19 in a vertical direction. The stopper 20 of the present embodiment is screwed into a nut 22 fixed to the guide cylinder holder 19. Therefore, the stopper position can be adjusted forward and backward based on the turning operation of the stopper 20. As a result, the inclined guide surface 18a
When the guide stroke of the inclined guide surface 18a is short, the stopper position can be adjusted in accordance with the elongation of the raising chain 15 (adjustment frequency is conventionally known). Less than
, The chain 15 can be maintained in an appropriate tension state.

In the structure constructed as described above, the raising chain 1 suspended between the driving wheel 12 and the idler wheel 13
5, the tension of the idler wheel 13 is adjusted based on the forward and backward movements of the idler wheel 13.
And the guide cylinder 1 for restricting the idle wheel holder 16 from retreating.
8, a guide tube holder 19 that supports the guide tube 18 so as to be able to advance and retreat and rotate freely, a stopper 20 that regulates the contact of the guide tube 18 with retreat, and a twist that urges the guide tube 18 in a predetermined rotation direction. A coil spring 21 is provided, and an inclined guide surface 18 for moving and guiding the guide cylinder 18 rotating in a predetermined direction in the forward direction is provided on a stopper contact portion of the guide cylinder 18.
As a result, the guide cylinder 18 urged by the torsion coil spring 21 presses the idler wheel holder 16 in the forward direction by the guide of the inclined guide surface 18a, and raises the chain 15 to maintain an appropriate tension state. Become. Since the inclination angle (advance angle) of the inclined guide surface 18a is set relatively small, the guide cylinder 18 has a reverse rotation preventing function (equivalent to the principle of preventing the worm gear from rotating in the reverse direction). The retraction of the wheel holder 16 is restricted. Therefore, frequent stopper position adjustment according to the extension of the raising chain 15 becomes unnecessary, and as a result, the tension adjustment of the raising chain 15 can be substantially automated.

Further, the stopper 20 is provided in the guide cylinder 1
Since the position can be adjusted in the forward and backward directions of 8, the initial contact position between the inclined guide surface 18a and the stopper 20 can be easily adjusted. In addition, when the guide stroke of the inclined guide surface 18a is short, the stopper 15 is adjusted based on the elongation of the elevating chain 15 (adjustment frequency is smaller than in the past), and the chain 15 is properly tensioned. There is an advantage that can be maintained.

The present invention is, of course, not limited to the above embodiment, and it goes without saying that, for example, the chain tension adjusting device of the present invention can be implemented by means other than the raising device.

[Brief description of the drawings]

FIG. 1 is a side view of a binder.

FIG. 2 is a front view of the raising device.

FIG. 3 is a side view of the same.

FIG. 4 is a schematic front view of the chain tension adjusting device.

FIG. 5 is a schematic side view (including movement of a guide cylinder) according to the first embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Binder 8 Raising device 10 Chain tension adjusting device 12 Drive wheel 13 Idle wheel 15 Raising chain 16 Idle wheel holder 18 Guide cylinder 18a Inclined guide surface 19 Guide cylinder holder 20 Stopper 21 Twist coil spring

Claims (2)

[Claims] 1. A chain tension adjusting device for adjusting the tension of a chain suspended between a driving wheel and an idle wheel based on the forward / backward movement of the idle wheel, wherein the idle wheel is attached to the chain tension adjusting device. A guide tube that guides the supporting idler wheel holder so as to be able to move forward and backward, and restricts the backward movement of the idler wheel holder, a guide tube holder that supports the guide tube so as to be able to move forward and backward, and is rotatable. A stopper for restricting the rotation and a torsion spring for urging the guide cylinder in a predetermined rotation direction are provided. Further, the guide cylinder rotating in the predetermined direction is guided to move forward in the stopper contact portion of the guide cylinder. A chain tension adjusting device having an inclined guide surface. 2. The chain tension adjusting device according to claim 1, wherein the position of the stopper according to claim 1 is adjustable in the direction in which the guide cylinder moves forward and backward.