JPS5913161B2 - Emergency braking device at pulley part - Google Patents

Description

[Detailed Description of the Invention] The present invention uses the rotational power of the prime mover of a backpack-type reaper to rotate and drive a rotary blade attached to the tip of the main frame, which is used for harvesting rice, mowing grass, pruning trees, etc. This invention relates to a reaper, and particularly relates to an emergency braking device in a pulley portion of a reaper.

In FIG. 1, 1 is a drive pulley fitted to the motor shaft, 2 is a driven pulley that is rotated via a belt between it and the drive pulley 1, 8 is a backpack for carrying the motor on the back, 9 is a band for carrying on the back, and γ is a cushioning material for carrying on the back.

All of the above-mentioned members are carried on the back of the worker, but the parts supported by both hands of the worker are the main frame 10, the blade angle turning rod 10', the gripping lever 3, and the parts supported by the worker's hands. The operating handles 4, 4' are open, and the tip thereof includes a guide frame 10A for the flexible main shaft, a flexible tube 15, a bearing portion 13, a rotary blade 16, and a safety cover 14.
, a support frame 11 for turning the direction of the rotary blade 16, and a bearing joint turning part 12.

5 is a rotating shaft of the driven pulley 2 and a rod 10' for turning the blade edge angle.
A flexible main shaft that is directly connected to the rotating shaft of the driven pulley 2 is connected to the rotary blade 16 by passing through each flexible tube and each frame, and While the rotary blade 16 is rotated by a prime mover located on the back, the rotation speed or rotation direction can be freely controlled.

6 is an accelerator wire, and 7 is a clutch wire.

The most common clutch system used in conventional harvesters is an automatic centrifugal clutch system, but with this system, the clutch is controlled only by the accelerator lever, and as a result, it is possible to accidentally press the accelerator lever. −
If the accelerator lever is moved, the automatic centrifugal clutch will operate, and unless the accelerator lever is manually released,
The most common method is that the engine continues to rotate.
There is a high risk of harm not only to the operator but also to people around the reaper.In addition, automatic centrifugal clutches in reapers etc. are of a type in which the rotary blades rotate at the same time as the reaper is started. Moreover, once the engine is rotated at high speed, due to the inertia of the engine and the inertia of the rotary blades, the power transmission is not cut until the rotational speed drops to the operating speed of the automatic centrifugal clutch. Due to the inertia of the rotating body, the rotation did not stop for some time after that.

For this reason, when you want to quickly stop the rotation of the rotary blade and the engine, you need to either hold down the engine stop switch or have this operation done mechanically. Since the stop switch had to be activated while the engine was running at high speed, it sucked too much raw gas into the engine, making it difficult to start again.

The present invention was made in order to eliminate all of the above-mentioned drawbacks, and provides a reaper that has significantly improved safety, durability of the reaper, and simplification of operation so that it can be easily used by women and girls. It was done for the purpose of

The configuration of the device of the present invention will be specifically explained based on the drawings showing one embodiment.

In FIGS. 2 to 5, the gripping lever 3 is attached to the pin 19.
The tip of the accelerator wire 6 is engaged at a position relatively close to the pin 19 on the grip lever 3, and the tip of the clutch wire 7 is engaged at a position relatively far away.

6A is a wire tube for the accelerator wire 6, and 7A is a wire tube for the clutch wire 7.

7' is an adjustment screw for adjusting the clutch torque, and by rotating the adjustment screw 7', the wire tube 7A is adjusted.
It is possible to arbitrarily adjust the operating length of the clutch wire 7 based on the overall length of the clutch wire 7.

Reference numeral 17 denotes an accelerator lever, which is independently rotatably attached to the main frame, a part of which forms an adjustment protrusion 17', through which the accelerator wire 6 passes, and which allows the wire tube 6 to pass through the accelerator lever 17.
The tip of A is held in place at this part.

That is, by independently rotating the accelerator lever 17, the grip lever 3 is adjusted in the same way as the adjustment screw 7'.
It is possible to adjust the operating length of the accelerator wire 6 independently of the operation of the accelerator wire 6.

In addition, the mounting condition regarding the rotation of the accelerator lever 17 is as follows.
Operation: When the accelerator lever 4 is attached, the friction with the lower end surface of the operation bundle 4 provides enough resistance to prevent the accelerator lever from rotating accidentally.
Even if the rotating blade is repeatedly started and stopped by the grip lever 3 while the accelerator lever 17 is rotated to a certain specific position, the accelerator lever 17 will not deviate from the specific position and rotate. It is possible to maintain and reproduce the old state.

This means that the accelerator lever 17 functions as a so-called memory device for setting the required rotational speed of the engine, which is extremely convenient when operating the reaper.

Reference numeral 18 is a lock safety device for the grip lever 3, and when the grip lever 3 is not operated, especially when the grip lever 3 is inadvertently
The purpose is completely achieved by raising this to the position indicated by the dashed line 18' when starting the engine, as soon as the operation of the grip lever 3 prevents it from operating and causing a danger. It functions as a safety device to prevent

In FIG. 4, 20 is a slide member, which is guided by a guide 21 and is movably attached.

A driven pulley 2 is attached to the upper surface of the slide member 20, and a spring 27 always applies a force in one direction, that is, in a direction toward the brake portion 28.

It is of course possible to use another elastic body in place of the spring 27 and apply pressure in one direction to the brake part 28, and if only braking is considered, it is also possible to press only the brake part against the pulley part. It is possible.

22 is a belt suspended between both pulleys, and 23 is a belt cover.

The belt cover 23 is installed so that its inner surface is close to the running surface of the belt 22.

Reference numeral 24 denotes a clutch operating portion, which is provided on an extension of the slide member 20 and guided along the guide 21 together with the slide member 20.

The guide 21 is fixed to a part of the prime mover with bolts.

The clutch wire 7 passes through the wire tube 7A and its tip is locked on the end face of the clutch actuating part 24, but the end of the wire tube 7A is supported by the end face of the clutch wire support part 25 via the spring 26. .

The clutch wire support portion 25 is fixed with bolts in the same manner as the guide 21, but it may also be integrally formed as a part of the prime mover or in its vicinity.

Further, one end of the spring 27 described above is locked to the other end surface of the clutch wire support portion 25.

With this configuration, when the gripping lever 3 is operated to change the operating length of the clutch wire 7, the manner of the change is alleviated by the entire length of the wire tube 7A and the cushioning action of the spring 26. , you can expect smooth operation.

Reference numeral 28 denotes a brake part of the driven pulley 2, which strongly contacts the circumferential surface of the driven pulley 2 and completely stops the inertial rotation when the driven pulley 2 approaches the brake part 28 together with the slide member 20. It is something.

Note that when the gripping lever 3 is not operated, a braking action is always performed by the action of the spring 27.

Next, the operation of the device of the present invention will be explained.

Now, when starting the engine, if you raise the locking safety device 18 of the gripping lever 3 with your fingers toward the first position, the gripping lever 3 will no longer operate, and in this state, the driven pulley 2 will be moved by the spring 27. Due to the action, the distance δ shown in Figure 4
At the same time, the belt 22, which is passed between the driving pulley 1 and the driven pulley 2, is in a relaxed state, and therefore The power transmission is completely cut off, and the back of the belt 22 in the relaxed state tries to return to its natural shape and comes into contact with the inner surface of the belt cover 23, so that the braking action is further applied.

Note that even in this state, the accelerator lever 17 can freely move, which is necessary when starting the engine.

This is because, as shown in FIGS. 2 and 3, the locking position of the accelerator lever 17 is different from that of the gripping lever 3, so that the accelerator lever 17 can freely move independently.
When starting the engine, inspecting or repairing the engine, only the accelerator lever 17 can be freely operated independently of the grip lever 3.

Next, when it is time for the operator to start work, he first tilts down the lock safety device 18 from the 18' position and grips the grip lever 3, and as the opening width of the accelerator increases,
Increase in rotation of the prime mover, release for braking action and belt 2
2 is automatically performed, and thereafter, depending on the operator's request or work conditions, the number of rotations of the prime mover can be increased or decreased freely by single operation of the accelerator lever 17.

In addition, if the operator experiences excessive shock from the cutting edge that cannot be controlled during work, the spring 2
60 action can absorb shock.

In the unlikely event that the operator falls down while working, and if his/her hand grasps the grip lever 3 for some reason or intentionally releases it, the spring 27
By the action of the brake section 28, the power transmission is interrupted, the braking operation is started, and the opening width of the accelerator is instantaneously reduced, thereby greatly contributing to ensuring the safety of the operator and preventing unexpected accidents.

In addition, although these are for emergencies, the grip lever 3 can be operated completely freely in normal situations based on the operator's will, and in such a reaper, the blade tip may be removed during operation. When removing grass, vinyl, etc. wrapped around the rotary blade 1, if you release the grip lever 3, the rotary blade 1
The rotation of 6 is instantly and automatically stopped to ensure maximum safety.

As described above, the device of the present invention not only maintains operational safety, but also improves work efficiency by extremely smoothly dealing with shocks caused by foreign objects transmitted from the rotating blade during work. Moreover, in order to absorb the inertial rotation of the entire driven body consisting of the driven pulley 2, the flexible main shaft 5', and the rotary blade 16 attached to the tip thereof during braking, the belt 22 is pressed at the same time as the braking part. When the back part slides into contact with the inner surface of the belt cover 23, the absorption can be stopped instantaneously, which has a remarkable effect on improving the workability of the reaper.

It goes without saying that the spring 26 in the embodiment shown in FIG. 4 can be replaced with another elastic body that performs the same function.

[Brief explanation of the drawing]

Fig. 1 is an outline drawing showing the entire reaper, Fig. 2 is a front view of the main parts of the device of the present invention, Fig. 3 is a plan view thereof, and Fig. 4 is a part of other main parts of the device of the present invention. FIG. 5 is a sectional view taken along the line V-■ in FIG. 4. 1... Drive pulley, 2... Driven pulley, 3... Grip lever, 4, 4'... Operation handle, 5, 15...
・Flexible tube 5/...Flexible main shaft, 6...Accelerator wire, 6A, 7A...Wire tube, 7...Clutch wire, 7'...Adjustment screw, 8...Backpack, 9 ...Band 9/, ...Cushion material, 10...Main frame, 10'...Blade angle turning rod, 10A...Guide ring, 11...Support ring, 12.
...Bearing joint turning section, 13...Bearing part, 14
...Safety cover, 16...Rotary blade, 17...Accelerator lever 117/...Adjustment protrusion, 18°18'...
・Lock safety device, 19...pin, 20...slide material, 21...guide, 22...belt, 23...
・Belt cover, 24...Clutch actuating part, 25...
・Clutch wire support part, 26, 2γ... Spring, 28
...Brake part.

Claims (1)

[Scope of Claims] 1. In a backpack-type reaper that uses the rotational power of the prime mover to rotate a rotary blade attached to the tip of the main frame, a drive pulley fitted to the shaft of the prime mover directly above the backpack; , has a driven pulley that is located directly above the back and is rotated by the pulley via a belt, and the driven pulley and the rotary blade are connected by a flexible main shaft that is provided through the main frame and inside, and the driven pulley is rotated by the pulley via a belt. A braking part is provided near the driven pulley, and an elastic body is connected to the sliding member supporting the driven pulley to apply a moving force to the sliding member in the direction of bringing the driven pulley and the braking part into pressure contact. The clutch lever is configured such that the movement of the driven pulley coincides with the movement in the direction of loosening the belt, and the clutch lever is pivoted in the middle of the main frame with the tip of the clutch wire locked, and the lever is attached to the grip lever. A locking safety device is provided to lock the other end of the clutch wire to the slide member and maintain a constant length between the main frame and the backpack by a wire tube that slidably accommodates the clutch wire. An emergency braking device for a pulley portion, characterized in that: 2. An accelerator lever is installed on the main frame near the gripping lever and can be rotated independently with a different mounting position from the gripping lever, and the prime mover and the gripping lever are connected by an accelerator wire. The accelerator wire is arranged via an adjustment protrusion provided on the accelerator lever, and the tension force acting on the accelerator wire can be adjusted by rotating the adjustment protrusion in response to rotation of the accelerator lever,
An emergency braking device for a pulley portion according to claim 1, wherein the accelerator lever is mounted to the main frame in a manner that provides resistance to prevent accidental rotation.