JPS6111557Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tension roller in a cultivator.

Conventionally, as a structure for adjusting the tension of a belt stretched between pulleys, there was a structure in which the pressing force of the tension roller was applied by operating the fulcrum of a spring, but this was mechanically complex, especially since it was difficult to perform the operation. The positional relationship between the lever and the spring needs to be made simple for the belt between the prime mover pulley and the mission pulley of the management machine, and is not suitable for the transmission belt of the management machine.

With this invention, the tension adjustment of the belt between the prime mover pulley and the transmission pulley of the management machine is
It is an object of the present invention to provide a tension roller in a management machine that can be operated with a simple structure.

To explain the embodiment shown in the drawings,
A is a control machine for a tiller, and has an engine 9 mounted on the front part of a machine body 6, running wheels 10 on the lower part, and an operating handle 11 on the rear part. 1
Reference numeral 2 denotes a transmission installed in the machine body 6, which consists of a V-belt 3 stretched between the engine pulley 1 and the transmission pulley 2, and a tension roller 4 is pressed against the lower part of the V-belt 3. . The tension roller 4 is pivotally supported by one end of a ram 5, and the other end of the ram 5 is connected to an operating lever 7 via a spring 8. The operating lever 7 has a short shaft 13 supported by a bracket 14 provided on the fuselage 6,
A gripping rod 15 is provided at one end of the short shaft 13, and a spring mounting arm 16 is attached to the other end of the short shaft 13.
The other end of the spring 8 is attached to the tip of the attachment arm 16.
Therefore, a gap equal to the length of the short shaft 13 is maintained between the gripping rod 15 and the spring 8, and the interlocking mechanism of the V-belt 3 is positioned within this gap. It is something that 17 in the figure
A stopper for rotating the operating lever is provided on the side surface of the bracket 14. 1
8 is the pivot pin of the lever 5, B is the hitch 1 to the management machine A.
The attachment connected via 9 is a rotary, 20 is a rotary claw thereof, and 21 is a rotary cover.

Therefore, during normal use of the tiller, the gripping rod 15 is tilted to the position shown by the solid line as shown in FIG.
The mounting arm 16 is moved away from the other end of the lever 5 and the spring 8 is extended, and the tension of the spring 8 presses the pressure roller 4 against the V-belt 3, thereby tightening the engine 9.
This transmits the power to the mission 12.
At this time, the operating lever 7 is received by the stopper 17 and held at that position, and is always held at this position during normal use. Next, when removing the belt 3 due to damage to the V-belt 3 or adjustment or replacement of the engine 9, the gripping rod 15 is rotated to the position shown by the imaginary line in Figure 2, and the spring 8 is held beyond the fulcrum. . Then, by bringing the mounting arm 16 close to the other end of the lever 5, the spring 8
is relaxed, and the pressing force of the pressing roller 4 on the V-belt 3 is reduced, and due to the reduction in the pressing force at this time, slack is generated between the belt 3 and the pulleys 1 and 2. The operating handle 7 may be set so that the slack is equal to the thickness of the V-belt 3, and there is no need to create more slack than necessary.

The present invention is constructed as described above, and the tension roller 4 is arranged approximately in the middle of the belt 3, and the pivot pin 18 of the ram 5 and the pivot parts of each pulley are arranged in separate positions. Because it has been
The clutch operation of the tension roller 4 can be performed easily and efficiently, and the tension roller 4 can effectively apply the force when the belt is pressed, and the base end of the spring 8 can be gripped. The spring mounting arm 16 is connected to the other end of the short shaft 13, which is a pivot point of the rod 15.
Since the base end of the spring 8, which moves over the fulcrum with the short shaft 13 in between, faces the base end of the gripping rod 15, the operation of the gripping rod quickly moves the spring over the fulcrum. The tension clutch can be operated easily, and furthermore, a gripping rod and a spring mounting arm for attaching the spring are connected to each end of the short shaft, and there is no tension between the spring and the gripping rod. Since there is an interval equal to the length of the short axis, a case for the belt, pulley, etc. can be interposed between them, and there is no need to incorporate an operating lever structure into the case housing the belt and pulley. This has the effect that the movement mechanism of the prime mover pulley and the transmission pulley can be configured to be simple and easy to operate.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing the tension roller in the management machine of the present invention. FIG. 2 is a side view showing the main parts. FIG. 3 is a plan view of FIG. 2. 1...Motor pulley, 2...Mission pulley, 3...Belt, 4...Tension roller,
5...Role, 6...Airframe, 7...Operation lever, 8
……spring.

Claims (1)

[Scope of utility model registration request] Management machine prime mover pulley 1 and transmission pulley 2
A belt 3 is stretched between the belt 3 and a tension roller 4 that is pressed against the approximately middle part of the belt 3.
The other end of the ram 5 was connected to an operating lever 7 via a spring 8, the center of the ram 5 was pivotally supported by a pivot pin 18, and the operating lever 7 was provided on the fuselage 6. The pivot pin 18 of the lever 5 is pivotally supported on the bracket 14 via the short shaft 13, and each pulley 1,
A gripping rod 1 for operating the operating lever 7 is provided at one end of the short shaft 13.
5, and a spring base end is provided at the other end of the short shaft 13 via a spring attachment arm 16 that is connected in the extending direction of the gripping rod 15. A rod 15 is connected to the spring mounting arm 16 at the other end, and
The gripping rod 15 and the spring mounting arm 16 are connected to the short shaft 13
are connected to both ends of the holding rod 15 and the spring mounting arm 16 to maintain a distance equal to the length of the short shaft 13;
A tension management machine in which the belt 3 is arranged at the same interval, and the belt is tensioned or relaxed by the rotation of the operating lever 7, which causes the spring to move beyond the fulcrum. roller.