JPH0824469B2 - Double clutch prevention structure of stem-and-bundle binding device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stem-bundle binding device used in a drainage straw binding device that binds a plurality of drainage straw bundles in a harvester together, or a combine straw drainage binding device. Regarding

[Conventional technology]

Conventionally, as a discharge straw bundling device for a harvester, Japanese Patent Laid-Open No.
No. 232024 is disclosed, and its main part is shown in FIG. 3 (corresponding to FIG. 2 of the publication).

In this discharge straw binding device, a packer drive shaft (10) for constantly driving the scraping packer (4) and a needle (not shown) for string supply are provided in a case located below the focusing space (S). A needle drive shaft (11) for intermittently driving and a door shaft (12) are provided, and a knot mechanism and a discharge arm are provided above the focusing space (S) in the figure, so that the door shaft ( When the focusing pressure above the set value acts on the focusing pressure sensing door (6) provided on the case outside protrusion of (12), the clutch starting arm (21) fixed to the inside part of the door shaft (12) is rotated clockwise. The clutch starter (22) linked to the clutch start arm (21) by the long hole pin swings counterclockwise around the fulcrum (23) while compressing the focusing pressure setting spring (25). The clutch actuator (22) is rotated counterclockwise and the knee is activated. The needle drive shaft (11) is rotationally driven by turning on and operating the one-rotation clutch (13) provided on the dollar drive shaft (11), and the rotation of the needle drive shaft (11) is rotated upward by a chain transmission mechanism (not shown). The knotting mechanism and the discharge arm are transmitted to the knotting part of No. 2 and are driven in synchronization with the string feeding operation by the needle. The one-rotation clutch (13) is rotatably supported by a disc cam (14) fixed to the needle drive shaft (11) and a fulcrum (16) about the disc cam (14), and a spring. A transmission arm (15) oscillated and urged counterclockwise by (17), and a gear (1) that is gear-linked to the packer drive shaft (10) and is constantly rotating counterclockwise.
8) It is composed of a transmission projection (20) provided on the upper side, and when the clutch is disengaged, the transmission arm (15) is locked to the claw (22a) of the clutch starter (22) and is connected to the spring (17). Against this, it is rotated relatively clockwise, and the transmission roller (15a) at the tip of the transmission arm (15) is retracted to a position inwardly displaced from the rotation locus of the transmission projection (20). And
As described above, when the clutch actuator (22) rotates counterclockwise by the detection of the focusing pressure equal to or higher than the set value and the pawl (22a) is disengaged from the transmission arm (15), the transmission arm (15) causes the spring (1
7) It rotates counterclockwise by 7) and the transmission roller (15a) enters the locus of the transmission projection (20), and the transmission roller (15a)
Is pressed against the transmission projection (20), the disc cam (14) starts to drive in the counterclockwise direction.
The rotary clutch (13) is in the engaged state.

When the disc cam (14) rotates about 180 °,
The cam follower (24a) of the spring receiving bracket (24) loosely fitted to the packer drive shaft (10) enters the recess (14a) of the disc cam (14), and the fixed end of the focusing pressure setting spring (25) retracts. , The clutch activator (22) pivots largely counterclockwise around the fulcrum (23), and with this, the door (6) retreats greatly and the focusing space (S) is opened backward, Discharge straw is allowed to pass.

Further, after the discharge of the exhausted straw, the cam follower (24a) is pressed by the circular cam surface of the disc cam (14), the spring receiving bracket (24) is returned to the original spring receiving posture, and the focusing pressure setting spring (25 ) Is compressed, the clutch activator (22) and the door (6) are returned to their original positions, and the claw (22a) of the clutch activator (22) is brought into a position where the transmission arm (15) can be locked. Be waited for. Then, the transmission arm (15) that has made one rotation (forward movement) together with the disc cam (14) continues to move forward while being locked by the pawl (22a), so that the transmission arm (15) becomes a spring (17) relatively. Against the fulcrum (2
It is oscillated clockwise around 3), the transmission roller (15a) is disengaged from the transmission projection (20), and the transmission from this projection (20) to the disc cam (14) is cut off. (13) is turned off.

One-rotation clutch (13) configured and operated as described above
The following problems may occur.

That is, the operation of returning the clutch activator (22) to the original position by the disc cam (14) and returning the door (6) from the converging space opening position to the original stalk receiving position is performed at a relatively high speed. Therefore, the door (6) may retreat again in the focusing pressure sensing direction due to its return reaction, and when the transmission arm (15) reaches its original position during this retreat displacement, the pawl (22a ), The one-turn clutch (13) remains in the engaged state, and the needle drive shaft (11) continues to be driven. A so-called double clutch phenomenon occurs, which causes a binding trouble.

This phenomenon is more likely to occur as the mass of the door (6) is larger, and occurs in an exhaust straw bundling device for harvesters and a combined straw exhaust bundling device that uses a large door (6) with a large converging space (S). It is easy to do.

Therefore, in the conventional binding device, the double clutch phenomenon is prevented by adding the following means.

As shown in FIG. 3, a gear (40) having the same diameter that meshes with the gear (18) that is provided with a transmission projection (20) and is constantly rotating is provided, and the gear (40) is contacted with the gear (40). A cam (33) is provided and a check arm (34) is connected to the base of the clutch drive arm (21) fixed to the door shaft (12) so that the door (6) is forcibly returned to the stem-culm receiving position. In the vicinity of the point of time when the contact cam (33) faces the check arm (34), the backward rotation of the door shaft (12) in the focusing pressure sensing direction is prevented from contacting.
In addition, when the one-turn clutch (13) is disengaged, the contact cam (33) is disengaged from the check arm (34) so that the focusing pressure can be sensed by the door (6). I tried to stop the phenomenon.

[Problems to be Solved by the Invention]

Although the above-mentioned restraint means can provide some results, it has not always been possible to completely prevent the double clutch phenomenon.

In other words, if the mass of the discharge arm that forcibly discharges the bundled discharge straws and the drive member of the discharge arm is large, the needle drive shaft (11) will rotate in advance due to the inertia of the discharge arm, which will cause it to rotate at a constant speed. It has been revealed that the contact cam (33) that is in operation may be delayed in timing with respect to the check arm (34), and it may not be possible to properly prevent the door retreating due to the reaction recoil. Further, this timing deviation is particularly likely to occur in a discharge straw bundling device for a harvester in which a large and heavy discharge arm is used.

An object of the present invention is to eliminate the above-mentioned inconvenience that has been found in the conventional restraining means for blocking the double clutch.

[Means for solving the problem]

In order to achieve the above object, in the present invention, the needle drive shaft (11) is intermittently provided via a one-rotation clutch (13) which is operated to be engaged by the clutch based on the backward displacement of the focusing pressure sensing door (6). A double clutch prevention structure of a stem-and-coil bundling device in which a knotting mechanism drive shaft (27) that drives the needle drive shaft (11) and drives a knotting mechanism (7) and a discharge arm (8) is tuned and linked. And a contact cam (33) is provided on the restraining rotating body (32) which is intermittently rotated in synchronization with the needle drive shaft (11), and the door (6)
Is forcibly returned from the focusing space open position to the original stem-culm receiving position, the door cam (12) provided with the door (6) is moved backward in the focusing pressure sensing direction to move the contact cam (33). ) To stop the contact, and when the one-turn clutch (13) is disengaged, the contact check by the contact cam (33) is released to allow the backward rotation of the door shaft (12). The contact cam (33) is formed.

[Action]

According to the above-mentioned characteristic structure, even if the needle drive shaft (11) synchronized with the inertia of the discharge arm (8) of the binding portion is rotated before the one-turn clutch (13) is disengaged, the needle drive shaft (11) is contacted. Since the restraining rotary body (32) provided with the cam (33) rotates in synchronization with the needle drive shaft (11), the contact cam (33) does not delay with respect to the return of the door (6). It will act on the restraining arm (34).

〔The invention's effect〕

As described above, according to the present invention, by rationally driving the rotating body provided with the contact cam, it is possible to avoid a check error due to inertia of the discharge arm or the like and reliably prevent the double clutch. It became so.

〔Example〕

Hereinafter, an embodiment in which the stem-culm device according to the present invention is used as a waste straw bundling device for a harvester will be described with reference to the drawings.

FIG. 2 shows the front of the discharge straw discharging section of the harvester. In the figure, (1) is a threshing device, (2) is a feed chain, and (3) is a discharge straw as a stem-and-bundle binding device according to the present invention. It is a binding device.

The discharge straw bundling device (3) binds and discharges several bundles of discharged straw after being unbunched, and scrapes the bundle below the convergence space (S) facing the end of the feed chain (2). The packing packer (4) and the string supply needle (5) are provided, the rear part of the focusing space (S) is closed by the focusing pressure sensing door (6), and the upper side of the focusing space (S). In addition, a knotting part (7) and a knotting part (9) composed of a crank driven discharge arm (8) are provided.

FIG. 1 is a front view showing the inside of the discharge straw binding device (3). (10) is a packer drive shaft for constantly driving the scraping packer (4), and (11) is a needle (5). Needle drive shaft for intermittent drive, (12) Door shaft with door (6) fixed, (13) Single rotation clutch, (14) Disc cam fixed with needle drive shaft (11), (15) Disc A transmission arm pivotally supported on a cam (14) around a fulcrum (16), (15a) a transmission roller provided at its tip, (17) a spring for urging the transmission arm, (18). Is a gear that is meshed with the gear (19) of the packer drive shaft (10) and is constantly fitted and driven on the needle drive shaft (11), and (20) is a transmission projection provided for this gear (18). 21) is the door axle (12)
The clutch actuating arm (22) is pivotally supported on the case side about the fulcrum (23) and is connected to the clutch actuating arm (21) by a clutch activator linked to the long hole pin ( 22a) is a claw provided for this, (24) is a spring bearing bracket loosely fitted to the packer drive shaft (10),
(25) is a compression spring for setting a focusing pressure, the rear end of which is supported by the bracket (24) and acts on the clutch starter (22).
Reference numeral (24a) is a cam follower provided in the spring receiving bracket (24), and the operation of the one-rotation clutch (13) is swaying with the conventional structure described above, and therefore the description thereof is omitted here.

Further, (26) in FIG. 1 is an output sprocket fixed to the needle drive shaft (11), and (27) is a knot that drives the knot mechanism (7) and the discharge arm (8) provided in the knot (9). Part drive shaft, (28) is an input sprocket attached to this shaft (27), said output sprocket (26) and input sprocket (28) are the first chain (29), two-stage intermediate sprocket (30), And the second chain (31), and the knot drive shaft (27) is connected to the needle drive shaft (11).
It is designed to be tuned by.

The above construction is basically the same as the conventional construction, and in the present invention, the double clutch prevention structure is constructed as follows.

That is, the sprocket (32) having the same diameter as that of the output sprocket (26) is engaged with the slack side path of the second chain (31), and is provided so as to rotate in synchronization with the needle drive shaft (11). A contact cam (33) is provided on (32).

On the other hand, a check arm (34) is extended from the door shaft (12), and a tip roller (34a) thereof is configured to contact a contact cam (33) having a specific phase. Then, the contact arm (33) rotates counterclockwise of the restraining arm (34) in the vicinity of the time when the door (6) is forcibly returned to the original stem culm receiving position from the converging space open position. Movement, that is, the backward rotation of the door shaft (12) in the focusing pressure sensing direction is abutted to prevent the double clutch phenomenon from occurring, and in the state where the one-rotation clutch (13) is completely disengaged, The contact restraint is released, and the backward rotation of the door shaft (12) is permitted to perform the focusing pressure detection.

According to this, the needle drive shaft (11) and the contact cam (3
Since it is always synchronized with 3), even if the needle drive shaft (11) rotates ahead of the gear (18) due to the inertia of the discharge arm (8) etc., it is appropriate for the drafting production by the contact cam (33). It will be demonstrated at the right timing.

The needle drive shaft (11) is geared to the shaft (1
The same function can be obtained even if a gear that is intermittently rotated in synchronization with 1) is separately provided and this gear is provided with the contact cam (33), and the gear is intermittently synchronized with the needle drive shaft (11). The rotating sprocket (32) and the gear are collectively referred to as a restraining rotating body.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 and 2 show an embodiment of a double clutch preventing structure for a stem-and-bundle binding device according to the present invention, FIG. 1 is a front view showing the inside of the stem-and-bundle binding device, and FIG. 2 is a discharge straw for a harvester. It is a front view which shows a processing part. Further, FIG. 3 is a front view of an essential part showing the inside of the case of the conventional example. (6) ...... Door, (7) ...... Knotting mechanism, (8) ...... Discharge arm, (11) ...... Needle drive shaft, (12) ...... Door shaft, (13) ...... 1 rotation clutch, ( 32) …… Rotating body for restraint, (33) …… Abutting cam, (34) …… Standing arm.

Claims (1)

[Claims] 1. A needle drive shaft (11) is intermittently driven through a one-rotation clutch (13) which is operated to be engaged based on the backward displacement of a focusing pressure sensing door (6).
A double clutch prevention structure of a stem-and-coil bundling device in which a knot mechanism (7) and a knot drive shaft (27) for driving a discharge arm (8) are tuned and interlocked with the needle drive shaft (11). A contact cam (33) is provided on a restraining rotating body (32) that is intermittently rotated in synchronization with the drive shaft (11), and the door (6) receives the original stem stem from the convergence space open position. When the door shaft (12) provided with the door (6) is forcibly returned to the position, the contact cam (33) prevents the backward rotation of the door shaft (12) in the focusing pressure sensing direction, and the one-turn clutch ( The abutment cam (33) is formed so that the abutment restraint by the abutment cam (33) is released when the cutting operation of the (13) is performed to allow the backward rotation of the door shaft (12). A double clutch prevention structure of a stem-culm bundling device, which is characterized in that