JPH023694Y2 - - Google Patents

Description

[Detailed explanation of the invention] With the planting clutch in a conventional rice transplanter, it was possible to manually rotate the planting rod in the opposite direction with the clutch shaft cut. The planting rod was rotated by power again until it reached the stopping position.

Therefore, for example, in a rice transplanter that is separately provided with a safety clutch, if the planting claw at the tip of the planting rod collides with a foreign object while scraping off seedlings, the safety clutch is cut and the planting rod stops.

At that time, the planting clutch was in a disengaged state, and when the planting rod was returned to the opposite direction by hand to remove the foreign matter, the planting clutch was engaged and the planting rod was rotated by the power to the stop position, causing an extremely dangerous situation. It was dangerous.

With this invention, when the planting clutch is cut, the planting rod can be stopped at a predetermined position above, and even if the stopped planting rod is manually rotated in the opposite direction, the planting clutch will not engage. The purpose of this invention is to provide a planting claw drive device for a rice transplanter that can safely remove foreign matter or perform other processing, and in which a clutch shaft supported by a transmission case has fixed position claws that are rotatably driven by a prime mover. The flange is loosely fitted so as to be rotatable, and the movable flange that engages with the pawl does not rotate relative to the clutch shaft but is slidably attached to constitute a dog clutch, and when the engaging piece engages with the movable flange, An inclined cam surface that disengages from the fixed position flange is provided, and a notch is provided from the terminal end of the cam surface toward the rotational direction of the clutch shaft to prevent the movable flange from sliding back and to allow reverse rotation to a small extent. It is characterized by the fact that it has been provided.

An embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a side view of the rice transplanter, and Fig. 2 is a plan view of the same, in which a transmission case 2 is attached to the engine 1 which is the prime mover, a transmission shaft case 3 is attached to the case 2, and a PTO transmission case 4 is attached to the case 3. are fixed in series,
A rear chassis 5 is protruded from the case 4 to fixedly support a handle support rod 6, and a handle 7 is attached to the rod 6.
In addition, a seedling stand 8 with a low front and high back height is installed on the upper part of the support rod 6, and planting rods 9, 9 having planting claws at the tips are provided on both sides of the PTO transmission case 4. A float 10 is provided outside the body consisting of the engine 1 and each case 2, 3, 4, and a pair of swing cases 11, 11 are provided on both sides of the transmission case 2, and axles 12, 12 are attached to the cases 11, 11. The running wheels 13, 13 are mounted on the shaft through the case 2, 11, 11, and the driving force of the engine 1 is outputted to the left and right wheels 13, 13 through the inside of each case 2, 11, 11.

As shown in FIGS. 3 and 4, a transmission shaft 14 for transmitting the PTO output of the engine 1 through the transmission case 2 is horizontally suspended in the transmission shaft case 3, and the shaft 14 has a bevel gear 15 and a fixed position flange 1.
A PTO input clutch shaft 17, which is appropriately interlocked via a gear 16a of No. 6, is mounted on the transmission case 4. Further, a transverse feed shaft 19 having a seedling table transverse feed thread groove 18 is provided parallel to the shaft 17, and each shaft 17, 19 is interlocked and connected by a variable speed gear 20, 21, 22, and the transverse feed shaft 19 is A sliding shaft 23 is provided parallel to
4 and 24, and the shaft 23 is operatively connected to a seedling feeding mechanism 26 on the lower surface of the table 8 via crank rods 25 and 25. Each of the aforementioned axes 19, 2
3 are connected via a sliding arm 27, and the arm 27 is fitted into the thread groove 18 of the transverse feed shaft 19, and the rotation of the shaft 19 causes the sliding shaft 23 to reciprocate together with the arm 27. While moving, the shaft 2 is moved at the reciprocating end via the protruding rods 28, 28 at both ends of the shaft 19 and the abutment rods 29, 29 of the shaft 23 on both sides of the arm 27.
3 is slightly rotated to cause the seedling feeding mechanism 26 to move intermittently.

Furthermore, an output shaft 30 for driving the planting rod is provided parallel to the PTO input clutch shaft 17, and the planting rod 9,
Both ends of the shaft 30 are connected to the middle of a pair of planting arms 32, 32, each having a shaft 9 and the other end supported by the case 4 via rotating arms 31, 31.

Further, a clutch pawl 3 is attached to a movable flange 33 that is slidably supported on the input clutch shaft 17.
4a, the clutch pawl 34a is detachably connected to a clutch pawl 34b of a fixed position flange 16 which is rotatably supported on the shaft 17 and has a gear 16a that constantly engages the bevel rod 15. , these flanges 16 and 33 constitute a planting clutch 35 which is a meshing clutch, and when an overload occurs on the planting rod 9, the fixed position flange 16 is pressed with a pressing force to the extent that the driving of the planting rod 9 is interrupted. A spring 36 for elastically locking the movable flange 33 via the clutch pawls 34a, 34b is wound around the shaft 17, and the fixed position flange 16 is attached via the gears 15, 16a.
The rotational force of the transmission shaft 14 transmitted to the input clutch shaft 17 is transmitted to the input clutch shaft 17 via the movable flange 33.

Furthermore, a sprocket 37 is integrally formed on the movable flange 33, and the output shaft 30
A sprocket 39 that is slidably engaged and supported via a spring 38 is provided at the sprocket 39, and the sprockets 37 and 39 are connected via a chain 40.

Next, as shown in FIG. 3, a stop cam 41 is integrally formed on the movable flange 33 to stop the planting rod 9 when it is moved upward, and the clutch shaft 42 is rotated parallel to the input clutch shaft 17. The planting rod 9 is placed in contact with the stop cam 41.
A locking or engaging piece 43 for cutting off the drive output for the shaft 42 is fixed to the shaft 42. The shaft 42 is connected to a planting clutch lever (not shown) via a link 45 formed by biasing a reciprocating spring 44.

As shown in FIGS. 5 and 6, the stop cam 41
is a spiral inclined cam surface 4 provided on the outer periphery of this large diameter portion.
6, a conical slope 47, and a positioning notch 48 formed in the small diameter portion of the cam 41. When the tip of the engaging piece 43 contacts the cam 41, the engaging piece 43 engages with the inclined cam surface 46. and slides on the slope 47 at the end of the cam surface 46 to move to the positioning notch 48,
This action causes the movable flange 33 to slide against the spring 36, and by disengaging the clutch pawl 34a of the movable flange 33 from the clutch pawl 34b of the fixed position flange 16, the planting rod 9 is positioned upward. Stop it in this state. Said planting rod 9
The stopping position is set in advance by engaging and pivoting the cam 41 on the shaft 17 in correspondence with the rod 9.
The distance between the starting end of the cam surface 46 and the ending end of the notch 48 is approximately 180
The cam 41 has an angle of 1.5 degrees, and is stopped when the cam 41 makes a half turn, and is configured so that the planting rod 9 is always stopped at this upward movement position after at least one rotation, that is, one cycle of the planting rod 9. This is what happens.

The present invention is constructed as described above, and the engine 1
While driving the wheels 13, 13 to travel through the
The transmission shaft 14 is rotated, and the fixed position flange 16 is rotated via each gear 15, 16a. The flange 16 freely rotates with respect to the input clutch shaft 17,
Under the condition shown in FIG. 4, the fixed position flange 16 and the movable flange 33 rotate together, and the input clutch shaft 1
7 and the transverse feed shaft 1 via each transmission gear 20 to 22.
9 is rotated to reciprocate the seedling platform 8 together with the sliding shaft 23 in the left-right direction of the rice transplanter, and at the same time, the output shaft 30 is rotated via the movable flange 33,
The planting rods 9, 9 are moved in a circular motion to plant the seedlings on the seedling stand 8 using each rod 9, 9. If an overload occurs on the rods 9, 9 when an accident occurs such as the claws of the rods becoming wedged, the overload is applied to the movable flange 33 via the sprockets 37, 39 and the chain 40, and The movable flange 33 slides against the spring 36 due to the rotational force of the flange 16, and the engagement between these flanges 16 and 33 is released, allowing the circular movement of the planting rod 9 and the lateral movement of the seedling platform 8. Interrupted. When the sprocket 37 is moved by the sliding movement of the movable flange 33, the opposing sprocket 39 is driven and moved against the spring 38, which facilitates the sliding movement of the movable flange 33. When the overload on the rods 9, 9 is removed, the movable flange 33 is moved by the spring 36.
The flange 16 is once again integrally connected to the fixed position flange 16, and the seedling planting operation can be continued.

When the seedling planting work is completed, the clutch shaft 42 is rotated against the spring 44 via the link 45 by the planting clutch lever provided on the handle 7, and the tip of the engaging piece 43 is rotated to the size of the stop cam 41. When brought into contact with the outer periphery of the diameter portion, the tip of the engagement piece 43 engages with the helical inclined cam surface 46 of the cam 41 due to the rotation of the movable flange 33 by the fixed position flange 16, and the cam surface 46 engages with the helical inclined cam surface 46 of the cam 41. Due to the sliding contact, the movable flange 33 is slightly separated from the fixed position flange 16 against the spring 36, and the engagement piece 43 slides down the slope 47 at the end of the cam surface 46, and the clutch pawls 34a and 34b are engaged. The movable flange 33 is moved so that it is released, and the fixed position flange 16 and the movable flange 33 are completely cut off. At this time, the tip of the engaging piece 43 was engaged with the positioning notch 48 of the small diameter part of the cam 41, preventing the movable flange 33 from rotating due to inertia, and lifting the planting rods 9, 9 upward as shown in FIG. It stops in the state
After that, the rice transplanter is moved to the next field, etc.

In addition, when a foreign object gets caught in the planting rod 9 during such work, resulting in an overload condition, and the engaging clutch 35 between the fixed position flange 16 and the movable flange 33 is disconnected, the movable flange 33 is engaged. Since it is possible to reversely rotate along the notch 48 while its return sliding is restricted by the piece 43, the planting rod 9 can be rotated manually.
It is not possible to move the movable flange 33 back and sufficiently separate it from the seedling stand 8 to remove the foreign object, and in this case, the movable flange 33 is prevented from sliding back, so it is safe because the engaging clutch 35 does not engage. .

In the present invention, as described above, the fixed position flange 16 with the pawl 34b rotatably driven by the prime mover 1 is loosely fitted into the clutch shaft 17 supported on the transmission case 4, and the movable flange 33 that engages with the pawl 34b is rotatably fitted. An inclined cam surface that does not rotate but is slidably attached to the clutch shaft 17 to constitute the engaging clutch 35, and is disengaged from the fixed position flange 16 when the engaging piece 43 engages the movable flange 33. 46, from the terminal end of the cam surface 46 to the clutch shaft 17.
Since a notch 48 is provided that allows reverse rotation while preventing the movable flange 33 from sliding back in the direction of rotation, when the planting clutch is cut, the planting rod 9 can be stopped at an elevated predetermined position. Of course, when a foreign object collides with the planting rod 9, by disengaging the planting clutch, the planting rod 9 can be manually rotated in the opposite direction, and the foreign object can be easily removed by sufficiently separating it from the seedling platform 8. At the same time, even if the planting rod 9 is rotated in the reverse direction, there is no danger of the clutch engaging and the planting rod 9 suddenly returning to the hole stop position as in the conventional system, and safe work can be performed.

Furthermore, when the planting rod 9 is reversely rotated to remove foreign matter from the planting rod 9, the engagement piece 43 is inserted into the notch 4.
8, the planting rod 9 does not easily rotate and descend, and foreign objects can be removed safely and securely with the planting rod 9 kept at an appropriate distance from the seedling stand 8. Can be removed.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the rice transplanter, Fig. 2 is a plan view of the same, and Fig. 3 is a side view of the rice transplanter.
The figure is a partially enlarged view, Figure 4 is a partially enlarged sectional view, and Figure 5 is a partially enlarged sectional view.
The figure is an enlarged sectional view of the main part, and FIG. 6 is a view taken along the line A--A in the previous figure. 1... Prime mover, 4... Transmission case, 9... Planting rod, 16... Fixed position flange, 17... Clutch shaft, 33... Movable flange, 34b... Claw, 35
... meshing clutch, 46 ... cam surface, 48 ... notch.

Claims (1)

[Scope of utility model registration request] A fixed position flange with a pawl that is rotationally driven by the prime mover is rotatably fitted into the clutch shaft supported by the transmission case, and a movable flange that engages with the pawl does not rotate but can slide freely relative to the clutch shaft. A slanted cam surface is provided that is disengaged from the fixed position flange when the engaging piece engages with the movable flange, and the cam surface extends from the terminal end of the cam surface toward the direction of rotation of the clutch shaft. A planting claw drive device for a rice transplanter that has a notch that prevents the return sliding of a movable flange while allowing a small amount of reverse rotation.