JPH019388Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission device for a variable binding machine.

The variable tying machine is configured to move the tying machine relative to the threshing device according to the amount of culms carried out from the threshing device, and to bind the culms at an optimal position. For this reason, in conventional binding machines, the driving sprocket is spline-fitted to the passive slide shaft so that it can slide directly, and a chain is suspended between the driving sprocket and the driving sprocket on the threshing device side. I'm trying to make it drive. However, according to this configuration, if there is misalignment between the fixed frame on the threshing device side and the binding machine due to processing or assembly errors,
There was a problem in that the sliding shaft of the binding machine and the driving sprocket were difficult to slide smoothly. Furthermore, since the driving sprocket is pulled toward the threshing device through the chain, a bending moment is applied to the slide shaft, deforming the shaft, which is a factor that increasingly causes the slide to become unsmooth.

The purpose of this invention is to solve the above-mentioned problems with conventional variable binding machines, not only to deal with misalignment caused by assembly errors, but also to prevent bending moment from being applied to the slide shaft, so that the binding machine slides smoothly. An object of the present invention is to provide a transmission device for a variable tying machine that can perform the following operations.

A transmission device for a variable tying machine according to the present invention that achieves the above object is a transmission device for a variable tying machine in which the tying machine is displaceably displaceable with respect to a driving sprocket together with a passive slide shaft. A coupling mechanism in which a drive sprocket is fitted around the boss part so as to be slidable in the axial direction and rotate integrally with the shaft, a driving sprocket is interposed on the outer periphery of the boss part with a gap in the radial direction, and the coupling mechanism allows relative movement in the radial direction. The drive sprocket is rotatably supported by a frame fixed to the threshing device main body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details will be explained below with reference to embodiments of the present invention shown in the drawings.

Fig. 1 is a plan view of a variable binding machine equipped with the transmission device of the present invention, Fig. 2 is a rear view, Fig. 3 is a side view, and Fig. 4 shows the main parts of the transmission device of the present invention. FIG. 5 is a cross-sectional view taken along the side of FIG. 4, and FIG. 6 is a cross-sectional view taken along the side of FIG. 2.

In Figures 1 to 3, 1 is a threshing device of a combine harvester, 2 is a culm conveying chain provided at the rear of the threshing device 1, and 3 is a culm conveyor chain for tying the culm carried out by the culm conveying chain 2. A binding machine 4 is a conveying device for conveying the discharged culm bundles after binding by the binding machine 3. A fixed frame 5 is integrally fixed to the threshing device 1, and a movable frame 6 is provided at the rear of the fixed frame 5 so that it can slide horizontally in the left and right direction and can be stopped by operating a lock lever 7. It is being A binding machine 3 is integrally fixed to the movable frame 6 via a support frame 8, and the binding machine 3 and the conveying device 4 can move and stop in the left and right direction together with the movable frame 6. . As shown in detail in FIG. 6, a rail 9 is fixed to the upper surface of the fixed frame 5 by welding or the like, and a movable frame 6 is placed on the upper surface of the rail 9 so as to be able to slide via rollers 11. ing. The roller 11 is rotatably supported by a shaft 10, and the shaft 10 has a threaded portion 10a at the tip thereof fixed to the side surface of the moving rail 6 with a nut 1.
2, and a clamp 13 is slidably inserted into the other end, and a lock lever 7 is provided at the other end.
Therefore, when the shaft 10 is rotated by the lock lever 7 and the threaded portion 10a is screwed together so that the distance between the clamp 13 and the nut 12 is shortened, both ends of the rail 9 are connected to the clamp 13 and the moving frame. As the sides of the rail 9 are tightened, the movable frame 6 is locked, and conversely, when the threaded portion 10a is screwed together so that the distance between the clamp 13 and the nut 12 is expanded, both ends of the rail 9, the clamp 13, and the movable rail 6 are tightened. A gap g is created between the movable frame 6 and the side surface, and the movable frame 6 can easily move on the rail 9 via the rollers 11.

The binding machine 3 is provided with a power-passing slide shaft 14 having a spline cut thereon, and a drive sprocket 15 is provided on this slide shaft 14 via a coupling 16 which will be described later. The slide shaft 14 is movable in the axial direction with respect to the drive sprocket 15, and rotates integrally with the drive sprocket 15 by receiving power therefrom. A chain 18 is suspended between the driving sprocket 15 and an intermediate sprocket 17 provided on the fixed frame 5, and a chain 18 is suspended between the driving sprocket 15 and a PTO sprocket 19 for a binding machine provided on the threshing device 1. 20 chains between
are suspended, and power from the PTO sprocket 19 is transmitted to the drive sprocket 15 via these chains 18 and 20.

As shown in FIG. 4, the drive sprocket 15
is rotatably supported by a bearing holder 21 via a bearing 22, and the bearing holder 21 is fixed to the fixed frame 5 by a bracket 23. On the other hand, a boss portion 24 is fitted to the powered slide shaft 14 of the binding machine 3 so as to mesh with a spline 14a carved on the surface thereof, and is slidable in the axial direction and together with the shaft. It is designed to be able to rotate as a unit. This boss portion 24 is fitted into the shaft hole of the drive sprocket 15 supported by the bearing holder 21 described above with a gap a interposed in the radial direction. The driving sprocket 15 and the boss portion 24, which are fitted together concentrically with a radial gap a, have radial surfaces facing each other at their ends, and each of these surfaces has a radius. Grooves 15a and 24a extending in the direction are cut. Groove 15
a and 24a have a V-shaped cross section as shown in FIG. 5, and a steel ball 25 is inserted between the grooves 15a and 24a so as to be held therebetween.

On the other hand, a spring 27 is stretched between the opposite end of the driving sprocket 15 and a spring receiver 26 fixed to the end of the boss portion 24, and this spring 27 causes the driving sprocket 15 to hold the ball 25. It is biased with an elastic force in the axial direction that presses it. As described above, the ball 25 is tightly held between the grooves 15a and 24a by the elastic force of the spring 27, thereby establishing the coupling mechanism 16 that connects the driving sprocket 15 and the boss portion 24 so as to enable power transmission. It consists of 29 is a prevention cover that prevents the ball 25 from flying out.

The above-mentioned coupling mechanism 16 has grooves 15a and 24.
a extends in the radial direction, and these grooves 15a, 2
It has a configuration in which a ball 25 is held between 4a,
In addition, since there is a gap a between the drive sprocket 15 and the boss part 24, the drive sprocket 15 and the boss part 24 can move relative to each other in the radial direction while remaining connected, and Misalignment of the axis can also be tolerated. In addition, since the coupling mechanism 16 is only connected to the power by being pressed by the elastic force of the spring 27, it can also act as a torque limiter, which prevents abnormal overload from occurring on the binding machine 3 side. It also has a function to prevent damage by letting it escape if it does.

Reference numeral 31 denotes an auxiliary guide, which auxiliarily guides movement in the left and right direction via an arm 30 extending from the binding machine 3.

In the transmission device of the variable binding machine described above, between the drive sprocket 15 and the slide shaft 14 of the binding machine 3, there is a boss portion fitted so as to be slidable on the slide shaft 14 and rotate integrally with the shaft. 24, a radial gap a is interposed between the boss portion 24 and the drive sprocket 15, and a coupling mechanism 16 is formed that is movable relative to each other in the radial direction. Therefore, even if misalignment occurs between the drive sprocket 15 and the slide shaft 14 due to machining or assembly errors on the fixed frame 5 of the binding machine 3, the coupling mechanism 16 and the radial clearance a This can be absorbed and the lateral movement of the binding machine 3 will not be made difficult. Furthermore, since the drive sprocket 15 is supported by the fixed frame 5 via the bearing holder 21, even if a tensile force is applied to the threshing device 1 by the chain 18, no bending moment will be applied to the slide shaft 14. do not have. Therefore, the lateral movement of the binding machine 3 will not become unsmooth due to deformation of the slide shaft 14.

As described above, the transmission device for the variable tying machine of the present invention is such that the tying machine is displaceably displaceable with respect to a drive sprocket together with a passive slide shaft, and a boss is attached to the slide shaft. A coupling mechanism in which a drive sprocket is fitted around the boss part so as to be slidable in the axial direction and rotate integrally with the shaft, a driving sprocket is interposed on the outer periphery of the boss part with a gap in the radial direction, and the coupling mechanism allows relative movement in the radial direction. Since the drive sprocket is rotatably supported by a frame fixed to the thresher body, there is no misalignment between the sliding shaft of the binding machine and the drive sprocket. Even if this happens, the misalignment is absorbed by the interposition of the coupling mechanism that allows relative movement in the radial direction and the radial gap, and the binding machine can slide smoothly. Further, since the tensile force of the chain applied to the drive sprocket is received by the fixed frame and does not act on the slide shaft, it is possible to prevent the binding machine from sliding smoothly due to bending and deformation of the slide shaft.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a variable binding machine equipped with the transmission device of the present invention, Fig. 2 is a rear view, Fig. 3 is a side view, and Fig. 4 shows the main parts of the transmission device of the present invention. FIG. 5 is a cross-sectional view taken along the side of FIG. 4, and FIG. 6 is a cross-sectional view taken along the side of FIG. 2. DESCRIPTION OF SYMBOLS 1... Threshing device, 3... Binding machine, 5... Fixed frame, 6... Moving frame, 14... Slide shaft, 15... Drive sprocket, 16... Coupling mechanism, 18... Chain, 21... ... Bearing holder, 23 ... Bracket, 24 ... Boss part, 15a, 24a ... Groove, 25 ... Ball, 2
7...Spring.

Claims (1)

[Claims for Utility Model Registration] 1. In a transmission device for a variable binding machine in which a binding machine is displaceably displaceable with respect to a drive sprocket together with a passive slide shaft, a boss portion is slidable in the axial direction on the slide shaft. and a driving sprocket is coaxially connected to the outer periphery of the boss portion via a coupling mechanism that allows relative movement in the radial direction with a gap in the radial direction. A transmission device for a variable binding machine, characterized in that the drive sprocket is rotatably supported by a frame fixed to a main body of the threshing device. 2. The coupling mechanism provides radial grooves on mutually opposing radial surfaces of the boss portion and the drive sprocket, and a ball is interposed between the opposing grooves and biased and held by an elastic force in the axial direction. Scope of Claims for Utility Model Registration
The transmission device of the variable binding machine described in 2.