JPS595291Y2 - Safety device for combine cutter - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety device for a cutter attached to a combine harvester, that is, a cutter for a combine harvester.

Generally, in this type of cutter for combine harvesters, the cutting operation is performed using a disc cutter.
In this cutter operation, the cutting blade and the rotor rotate in reverse with their blade edges engaged with each other, and the waste straw is cut due to the difference in circumferential speed between the two.

However, when the cutter is in operation, more waste straw is supplied than the cutting capacity of the cutter, resulting in straw clogging, which significantly impedes work efficiency and causes malfunctions.

In addition, inserting your hand into the cutter to remove the clogged straw was extremely dangerous due to the cutting blade.

Therefore, this invention allows the cutter to operate in reverse when the cutter cover is cleared of straw, allowing for quick work without the need for any special sensing means, and smooth discharge of the clogged straw. The purpose is to provide a safety device for cutters for combine harvesters.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a combine harvester body, which is constructed by installing an automatic threshing machine 5 on the upper side of a traveling device 3, and a reaping device 7 at the front thereof.

Reference numeral 9 indicates a husk transfer chain of the automatic thresher 5, 11 indicates a peg provided adjacent to the culm transfer chain 9, and numeral 23 indicates a culm transfer chain 11.
This is a clamping stand that supports the holder with a spring 15 interposed therebetween.

17 is a straw conveying belt connected to the culm conveying chain 9;
Reference numeral 19 denotes a rail for discharging straw provided close to the belt 17 for discharging straw.

Reference numeral 21 denotes a cutter case attached to the straw discharge side of the automatic threshing machine 5, the upper part of which serves as a receiving opening for receiving the straw lying on its side, and the lower part serving as a cut straw discharge port 21a.

At the upper end of the cutter case 21, there is a cutter cover that rotates about the mounting shaft P as a fulcrum to switch between a chain line position that closes the receiving port and a solid line position that opens the receiving port, as shown in FIG. 23 are provided.

Reference numeral 25 denotes a cutter shaft having a plurality of cutting blades 27 arranged side by side with cutting edges formed on the periphery, both ends of which are rotatably supported on both side walls of the cutter case 21, and a cutter pulley 29 at one end.
is installed.

31 is a rotor shaft having a rotor 33;
3 is disposed at a position overlapping the rotation locus of the cutting blade 27, is rotatably supported on both side walls of the cutter case 21, and has a rotor pulley 35 attached to one end.

The cutter shaft 25 and the rotor shaft 31 are connected to each other so as to be transmittable through gears (not shown) that mesh with each other.

That is, when one shaft rotates, the other shaft rotates in the opposite direction.

37 is a drive shaft that rotates via a transmission device (not shown) of the automatic threshing machine 5, and a drive pulley 39 is attached to one end.

The drive pulley 39 is connected to the cutter pulley 29 and the rotor pulley 35, respectively.
3 is being passed around.

45 is a forward/reverse switching clutch.

The forward/reverse switching clutch 45 is rotatable by a shaft 49 at the base end of a clutch arm 51 which has a tension pulley 47 formed in a so-called double width so as to be able to come into contact with both of the bells 41 and 43. It is supported by the machine body, one end of a connecting rod 53 is pivotally connected to the base end of the clutch arm 51, and the other end of the connecting rod 53 is pivotally connected to the cutter cover 23.

The cutter cover 23 and the connecting rod 53 constitute a clutch switching connection mechanism that detects straw clogging in the cutter, and when the cutter cover 23 is closed, the forward/reverse switching clutch 45 keeps the belt 41 in a tensioned state. Therefore, power is transmitted from the drive shaft 37 to the cutter shaft 25.

In addition, when the cutter cover 23 is open, the forward/reverse switching clutch 45 keeps the belt 43 under tension.
It is configured such that power is transmitted from the drive shaft 37 to the rotor shaft 31.

As a result, the clutch switching connection mechanism 23.53 and the forward/reverse switching clutch 45 are arranged to operate in conjunction with each other to operate the cutter in reverse when the clutch switching connection mechanism 23.53 detects straw clogging. ing.

Next, the effect will be explained.

Now, start each device of the combine harvester body 1, move the machine body 1 forward, and transfer the husk cut by the reaping device 7 to the automatic threshing machine 5, where it will be transferred between the husk transfer chain 9 and the clamping rod 11. The waste straw that has been threshed while being
It is transported to the cutter case 21 by.

Since the cutter cover 23 of the cutter case 21 is always closed, the tension pulley 4
7 is pressed downward, tensioning the belt 41 that is wrapped around the drive pulley 39 of the drive shaft 37 and the cutter pulley 29 of the cutter shaft 25, and transmits the power of the drive shaft 37 to the cutter shaft 2.
5, the cutter shaft 25 and the rotor shaft 3
1 gears that mesh with each other (not shown)
The power of the drive shaft 37 is also transmitted to the rotor shaft 31 via the rotor shaft 31, and the switching blade 27 and the rotor 33 rotate in the direction of arrow A in FIG. 2, respectively.

The waste straw sent out from the straw removal belt 17 and the straw removal rail 19 reaches the cutter case 21, and as the rotor 33 rotates in the direction of arrow A, the cutter case 21
Scratched into 1.

The straw scraped into the cutter case 21 is removed from the cutting blade 27 by rotation of the cutting blade 27 and rotor 33 in the direction of arrow A.
and the rotor 33, the straw is cut, and the straw is discharged outside the machine from the straw discharge port 21a.

During such work, if more waste straw than the cutting capacity of the cutter is continuously fed onto the cutter case 21,
In an extreme example, waste straw becomes clogged between the cutting blade 27 and the rotor 33, and the resistance applied to the cutting blade 27 and the rotor 33 increases, causing the cutting blade 27 and the rotor 33 to stop or rotate extremely slowly.

When the straw is still sent out from the straw removal belt 17 and the straw removal rail 19 in this state, the waste straw gradually accumulates from between the rotor 33 and the inside of the cutter case 21 to the outside of the cutter case 21. I'm going to accumulate it.

When waste straw accumulates outside the cutter case 21, the inside of the cutter cover 23 becomes filled with waste straw, and the feeding force of the waste straw sent out from the waste straw feeding belt 17 and the waste straw feeding rail 19 increases the inside of the cutter cover 23. Press the rear wall of the cutter cover 23 through the straw.

Therefore, the cutter cover 23 rotates about the mounting shaft P as a fulcrum, and becomes the state shown by the solid line in FIG. 2, opening the top of the cutter case 21.

When the tension pulley 47 rises via the connecting rod 53, the tension of the belt 41, which is passed between the drive pulley 39 of the drive shaft 37 and the cutter pulley 29 of the cutter shaft 25, is relaxed and power is transmitted to the cutter shaft 25. The belt 43, which is cut and stretched between the drive pulley 39 of the drive shaft 37 and the rotor pulley 35 of the rotor shaft 31, is tightened to transmit the power of the drive shaft 37 to the rotor shaft 31, and to connect the cutter shaft 25 and the rotor. A drive shaft 37 is also connected to the cutter shaft 25 via gears provided on the shafts 31 and meshing with each other.
transmits power.

At this time, the rotor shaft 31 and the cutter shaft 25 rotate in the opposite direction (as shown by the arrow in FIG. 2) to the direction of rotation during the cutting process, so the cutting blade 27 and the rotor 33 are rotated in the opposite direction.
The straw stuck between the cutting blade 27 and the rotor 33 is removed.

For this reason, the cutting blade 27 and the rotor 33 can be rotated without difficulty, and the cutting blade 27 may be damaged.
This prevents damage to the drive device that drives the rotor 33, etc.

When the cutter cover 23 is opened as shown by the solid line in FIG. 2, the operator can check whether the cutter is clogged by looking at the opened cutter cover 23.

Therefore, if the operator removes the straw on the cutter case 21 and closes the cutter cover 23 as shown by the chain line in FIG. 2, the cutting blade 27 and rotor 33 will move as shown by the arrow in FIG. It rotates forward in the direction of , and the straw is again cut smoothly.

In this case, the clogging between the cutting blade 27 and the rotor 33 is removed by reversing the rotation of the cutting blade 27 and the rotor 33,
The straw clogged in the cutter case 21 expands as the force in the direction of the clog is removed by the rotation of the rotor 33, and a part of it is pushed out of the cutter case 21 due to the scraping action of the rotor 33. When the cutting blade 27 and the rotor 33 rotate normally as described above, the amount of waste straw in the cutter case 21 is within the processing capacity, and smooth cutting is performed.

In the above embodiment, the cutting blades 27 and the rotor 33 are arranged in a substantially vertical direction, but even if they are arranged in a horizontal direction, straw clogging between the cutting blades 27 and the rotor 23 due to reversal may occur. Since the removing action and the fact that the straw clogged in the cutter case 21 expands due to the reverse rotation of the rotor 33 and are subjected to the scraping action of the rotor 33 are the same, the same action is achieved.

As is clear from the above, this invention has a structure in which a cutter is attached to an automatic threshing machine, and the power is transmitted from the threshing machine drive shaft to the cutter through a forward/reverse switching clutch so that forward and reverse rotation is possible. , a cutter cover that can be opened and closed is provided when the cutter is clogged with straw, and the cutter cover and the pressure/reverse switching clutch are linked to operate the cutter in reverse when the cutter cover is clogged with straw. This is a safety device for a cutter for a combine harvester, which has the following effects.

(a) The cutter cover can improve work safety by blocking the cutter when it is rotating normally.

When the cutter is clogged with waste straw, the waste straw fed later into the cutter cover has nowhere to go, and eventually opens the cutter cover and overflows.

Therefore, even without providing special equipment such as a warning lamp, by opening the cutter cover, the operator can quickly know that the straw is clogged, and work stagnation can be reduced, and prompt work can be expected.

(b) Since the cutter cover automatically opens when the straw is clogged, it is no longer necessary to open the cutter cover manually, and the straw can be smoothly discharged without being obstructed by the cutter cover.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; FIG. 1 is an overall side view of a combine harvester equipped with the device of this invention, and FIG. 2 is an explanatory side view of the main parts showing its operation. Explanation of the symbols representing the main parts of the drawing 5...
Automatic threshing machine, 21... Cutter case, 23.
... Cutter cover, 25 ... Cutter shaft, 27 ... Cutting blade, 31 ... Rotor shaft, 33 ... Rotor, 37 ... ...Drive shaft, 41.43...Belt, 45...
・Forward/reverse switching clutch, 47...Tension pulley, 53...Connection rod.

Claims (1)

[Scope of utility model registration request] A cutter is attached to the automatic threshing machine, and the power transmission from the drive shaft of the threshing machine to the cutter is configured to be capable of forward and reverse rotation via a forward/reverse switching clutch, and is opened and closed when the cutter becomes clogged with straw. This safety device for a cutter for a combine harvester is provided with a freely movable cutter cover, and the cutter cover and the forward/reverse switching clutch are interlocked to operate the cutter in the reverse direction when the cutter cover is cleared of straw jamming.