JPH0449874Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is used in agricultural binding machines used for binding waste straw after threshing in combine harvesters or harvesters, and for binding grain culms after reaping in binders. The present invention relates to a reversal prevention device for preventing reversal of a binding clutch configured as a one-turn clutch.

BACKGROUND ART In agricultural binding clutches, the clutch pawl on the clutch cam engages with the forward rotation regulating portion on the clutch arm at the end of clutch operation, and the clutch cam or binding clutch is reversed due to the reaction when the binding clutch is disengaged. For example, a reversal prevention mechanism for preventing the
-As disclosed in Publication No. 36493, since ancient times,
The clutch cam is equipped with a reversal prevention pawl that engages in a notch formed on the circumferential surface of the clutch cam under the force of a spring to prevent the clutch cam from reversing, and this structure has been followed to this day. There is.

Such a reversal prevention mechanism is designed to be rotated through the tying clutch in an agricultural tying machine, because if an excessive force is applied in the direction of reverse tying of the clutch, the succumbing of the spring may cause the tying cam to escape from the clutch cam. The discharging arm for discharging the bundle is generally designed to prevent the discharging arm from exerting excessive force on the binding clutch due to the reaction after the bundle discharging rotation, causing the clutch to reverse, for example, in Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent No. 78509, it is rotatably biased toward the standby position by a return spring.

Problems to be Solved by the Invention The above-mentioned reversal prevention mechanism requires a special support part for the binding case, and requires a reversal prevention pawl, its support shaft, an energizing spring, bolts, and other connecting devices, resulting in a large number of parts. There are many parts, and it takes time to assemble. In addition, if each part of the clutch wears, the operating angle of the binding clutch becomes uncertain, and the notch on the circumference of the clutch cam is not brought to the phase where the anti-reverse pawl acts, making it impossible to prevent reversal reliably. come.

Therefore, this idea is a new agricultural binding clutch that has a structure with a small number of parts, reliably prevents the clutch from reversing over a long period of time, and eliminates the need for the conventional return spring for the discharging arm, contributing to reducing the cost of agricultural binding machines. The present invention aims to provide a reverse rotation prevention device.

Technical measures taken to solve the problem To this end, this invention fixes the inner ring 5 to the clutch shaft 3 between the clutch shaft 3 of the binding clutch 2 and the binding case 1, as illustrated in FIGS. A one-way clutch 4 is provided with an outer ring 6 fixed to the binding case 1 and whose engagement direction is the reverse direction of the clutch shaft 3.

Function Even if the clutch shaft 3 tries to reverse and the inner ring 5 fixed to it tries to rotate in the same direction, the outer ring 6 of the one-way clutch 4 whose engagement direction is the same direction is fixed to the binding case 1 and cannot rotate. Therefore, the clutch shaft 3 cannot be reversed. Normal rotation of the clutch shaft 3 is permitted by idle rotation of the one-way clutch 4.

The one-way clutch 4 can be easily assembled by using a commercially available product and fixing it as required using fixing tools such as keys 7 and 8 used in the illustrated example.

Embodiment The illustrated embodiment relates to an example in which this invention is implemented in a waste straw tying machine equipped at the rear of a combine harvester C by means of a support frame F, as shown in FIG.

In the bundling machine shown in FIG. 3, a bundling passage 11 running along the front and back direction as usual is sandwiched between the bundling passages 11 and a door 12 for receiving straw, a pair of packers 13 and 14 for feeding straw, and A needle 15, etc. for winding a string around the straw bundle, and a holder 16 for holding the string winding, a bill 17 for knotting, and a pair of release arms 18, 19 for releasing the straw bundle, etc. are installed above. It is provided in the binding case 1.

As shown in FIGS. 1 and 3, the part of the binding case 1 located below the binding passage 11 has an input shaft 20 and a packer shaft 2 equipped with a packer drive crank 21.
2, the clutch shaft 3 equipped with a needle drive crank 23, and a door shaft 24, which fixes the door 12 and supports the needle 15, are arranged parallel to each other and supported rotatably. . The clutch shaft 3 is as usual, for example, in the 1980s.
As disclosed in Japanese Patent No. 77337, power is transmitted to the portion of the binding case 1 located above the binding passage 11 in the binding case 1 which is in the form of a horizontal gate, and the holder 16, the building 17, and the release arms 18, 19 are moved. It is also used as a driving shaft to drive the
In FIG. 1, reference numeral 25 designates a transmission shaft connected at one end to the clutch shaft 3, equipped with a sprocket wheel (not shown) on the other end, and transmitting power to an articulated drive shaft 26 shown in FIG. 3.

As shown in Figure 1, the input shaft 2 is
A gear 28 is fixedly installed on the gear 28, and a gear 29 meshed with the gear 28 is fixedly installed on the packer shaft 22 to constantly drive the packer shaft 22. The gear 2 is mounted on the clutch shaft 3.
A clutch gear 30 meshed with a clutch gear 9 is loosely fitted, and a clutch cam 31 is fixedly installed above the clutch gear 30, and the binding clutch 2 is disposed between the clutch gear 30 and the clutch cam 31 like a communication link. There is.

The clutch mechanism itself of the binding clutch 2 is similar to a well-known one, and includes a clutch arm 3 which is loosely supported by a packer shaft 22 and is rotationally biased by a clutch spring (not shown) which senses the pressing force against the door 12.
2, and the actuation of the binding clutch 2 is controlled by the arm 32. That is, when a predetermined amount of straw bundles are gathered in the bundling passage 11 shown in FIG.
The clutch arm 32 is rotated slightly due to the pressing force of the packers 13 and 14, and the clutch arm 32, which had engaged with the clutch pawl 33 provided on the clutch cam 31 and prevented the clutch cam 31 from rotating in the normal direction, escapes. Thus, a clutch operating state is obtained in which the driving portion 30a of the clutch gear 30 pushes and rotates the clutch cam 31. When the clutch cam 31 and the clutch shaft 3 rotate once, the clutch arm 32 returns to its original position.
When the clutch cam 31 engages with the clutch pawl 33 again, a clutch disengaged state is obtained in which forward rotation of the clutch cam 31 is prevented.

On the other hand, the illustrated bundling clutch 2 is not provided with a reversal prevention mechanism including a conventional reversal prevention pawl, but is provided with the one-way clutch 4 instead. The one-way clutch 4 is provided between a pair of ball bearings 35 and 36 that support one end of the clutch shaft 3. As shown in FIG. 2, the one-way clutch 4 has a retainer ring 4
It has a plurality of engaging elements 4b which are held at the position A and are arranged between the inner ring 5 and the outer ring 6, and the engaging elements 4b are indicated by the arrow A in the figure.
When the clutch shaft 3 rotates in the normal direction, it slides into contact with the inner and outer rings 5 and 6, but when the clutch shaft 3 attempts to reverse in the direction opposite to arrow A, it engages with the inner and outer rings 5 and 6, causing the same reverse rotation. to prevent

Furthermore, the illustrated binding machine does not include return springs for the release arms 18 and 19 illustrated in FIG. 3. In other words, even if a large force in the reverse direction is applied to the clutch shaft 3 from the release arms 18 and 19 side, the one-way clutch 4, which fixes the outer ring 6 to the binding case 1, will prevent the clutch shaft 3 from being completely reversed. Since this is prevented, there is no need to provide return springs for the ejection arms 18, 19.

Effects of the invention According to this invention, when a force in the direction of reversal is applied to the clutch shaft 3, that force is received by the binding case 1 through the one-way clutch 4, and the reversal of the clutch shaft 3 is completely prevented. Even if wear occurs in the clutch mechanism of the binding clutch 2, this does not change the situation, so that reversal of the binding clutch is reliably prevented for a long period of time.

One-way clutches are mass-produced at low cost, and the one-way clutch 4 can be assembled into a binding machine by fixing its inner ring 5 to the clutch shaft 3 and fixing its outer ring 6 to a binding case. This can be easily done from outside the binding case 1 at the part from which the clutch shaft 3 extends. This invention also eliminates the conventional reversal prevention mechanism that requires a large number of parts, and also eliminates the return spring for the release arm by ensuring that the binding clutch is prevented from reversing.This invention greatly reduces the cost of the agricultural binding machine. This also reduces the weight of the binding machine.

[Brief explanation of the drawing]

Fig. 1 is a partially exploded longitudinal sectional view showing the main parts of a binding machine equipped with an embodiment of this invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 shows the above-mentioned binding machine. It is a side view of a state where a combine harvester is equipped. 1... Binding case, 2... Binding clutch, 3...
...Clutch shaft, 4...One-way clutch, 5...Inner ring, 6...Outer ring, 7, 8...Key.

Claims (1)

[Scope of utility model registration request] Clutch shaft 3 of binding clutch 2 and binding case 1
In between, a one-way clutch 4 is provided, in which an inner ring 5 is fixed to a clutch shaft 3, an outer ring 6 is fixed to a binding case 1, and the direction of engagement is the direction in which the clutch shaft 3 is reversed. Device.