JP2020145987A - Implement - Google Patents

Abstract

To provide an implement in which right and left wires, and right and left springs are provided on a rolling mechanism, in which the right and left springs hardly become a resistance to a rolling operation.SOLUTION: In a state in which a work device is positioned at a set posture, in front view, right and left wires 47, 48 are extended to a right side and a left side respectively in parallel to the work device from a rotor 39, in the state, gaps W1, W2 in a lateral direction between right and left connection parts 25a, 25b and extension end parts 47a, 48a of the right and left wires 47, 48 are set to become shorter than a natural length L1, L2 of right and left springs 33, 34. Over the right and left connection parts 25a, 25b and extension end parts 47a, 48a of the right and left wires 47, 48, right and left springs 33, 34 are connected.SELECTED DRAWING: Figure 9

Description

The present invention relates to a configuration of a rolling operation of a work device in a work machine in which the work device is supported by the machine body so as to be rollable around an axis in the front-rear direction.

In a passenger-type rice planting machine, which is an example of a working machine, as disclosed in Patent Document 1, a rotating body rotatably supported by a rolling mechanism for rolling the working device, and a rotating body on one side and the other side. Some are provided with an electric motor that is rotationally driven to the side, and right and left wires that are wound around the rotating body and extend to the right and left sides from the rotating body.

In Patent Document 1, the right spring is connected to the right connecting portion with respect to the rotating body in the working device and the extending end of the right wire, and the left connecting portion with respect to the rotating body in the working device. And the left spring are connected to the extension end of the left wire.

When the work device tilts to the right-down posture and the left-down posture from the set posture in which the detection value of the tilt sensor is the set tilt angle, the rotating body is rotationally driven to one side and the other side by the electric motor, and the right and left wires. Is pulled by and pushed out of the rotating body, and the working device is rolled into a set posture via right and left springs.
The right and left springs are intended to allow the rolling operation of the working device to be performed smoothly while slightly absorbing the movement of the right and left wires.

In Patent Document 1, the right and left springs are slightly stretched from their natural lengths, and the right and left springs are set to generate a tensile force when the working device is in the set posture. Due to the pulling force of the left spring, the right and left wires and the right and left springs are stretched in a straight line without loosening downward.

Japanese Unexamined Patent Publication No. 2014-68573

In Patent Document 1, when the working device is tilted from the set posture to the right downward posture, the right wire and the spring are pulled by the working device to the side away from the rotating body, and the right spring is further stretched. On the other hand, the left wire and the spring are pushed toward the rotating body by the working device, and the left spring tries to return to the natural length.
In this state, in Patent Document 1, the rotating body is rotationally driven by the electric motor, the right wire and the spring are pulled by the rotating body, and the working device is rolled to the set posture.

On the other hand, the left wire and spring are pushed out from the rotating body, but when the working device is rolled to the set posture, the left wire and spring are pulled away from the rotating body by the working device. , The left spring tries to return to its original state, which is slightly stretched from its natural length.

If the left spring tries to return to its original state, which is slightly stretched from its natural length, the left spring may resist the rolling operation in which the work equipment is returned from the right downward posture to the set posture. ..
Similarly, the right spring may act as a resistance to the rolling operation in which the working device is returned from the left downward posture to the set posture.

An object of the present invention is to configure a working machine in which right and left wires and right and left springs are provided in a rolling mechanism so that the right and left springs do not easily become resistance to rolling operation.

The working machine of the present invention rolls the working device, which is supported by the machine body so as to be able to roll around the axis in the front-rear direction, a tilt sensor that detects the tilt angle of the working device in the left-right direction, and the working device. A rolling mechanism is provided, and the rolling mechanism includes a rotating body rotatably supported, an electric motor that rotationally drives the rotating body to one side and the other side, and the rotating body wound around the rotating body. Right and left wires extending from the right side and the left side are provided, and are connected to the rotating body in the working device over the right connecting portion and the right extending end portion of the wire. The tilt sensor is provided with a right spring and a left spring connected to the rotating body in the working apparatus over a connection portion on the left side and an extension end portion of the wire on the left side. In a state where the work device is positioned in a set posture in which the detected value of is the set tilt angle, the right and left wires are extended from the rotating body to the right and left sides in parallel with the work device in front view. The distance between the extension ends of the right and left wires in the state and the right and left connections in the left-right direction is set to be shorter than the natural length of the right and left springs. , The electric motor rotationally drives the rotating body to one side and the other side, and the right and left wires are pulled by the rotating body and pushed out from the rotating body, so that the detected value of the tilt sensor is obtained. A rolling control unit for rolling the working device is provided so as to have the set inclination angle.

According to the present invention, when the working device is positioned in the set posture and the right and left wires are extended from the rotating body to the right and left sides in parallel with the working device in a front view, the right and left wires are on the right. The distance between the extending end of the wire and the right connection of the working device in the left-right direction is set to be shorter than the natural length of the right spring. The distance between the extension end of the left wire and the left connection of the work equipment in the left-right direction is set to be shorter than the natural length of the left spring.

As a result, the right and left springs try to return to their natural lengths when the working device is in the set posture, and the weight of the right and left springs causes the right and left wires and the right and left springs to return to their natural lengths. There is a slight downward slack between the rotating body and the right and left connections of the work device.

In the above-mentioned state, according to the present invention, when the working device is tilted from the set posture to the right downward posture, the right wire and the spring are pulled to the side away from the rotating body by the right connecting portion of the working device and are lowered. It tries to change from a loose state to a straight line.
On the other hand, the left wire and the spring are pushed toward the rotating body by the left connection portion of the working device, and are about to be further slackened downward.
In this state, the rolling control unit operates the electric motor to rotationally drive the rotating body, pull the right wire to the rotating body, and push the left wire out of the rotating body.

As a result, the right wire and the spring are pulled in a straight line from the slackened state to the lower side, the right wire is pulled by the rotating body, and the working device is moved down to the right by the right wire and the spring. The rolling operation is performed from the posture to the set posture, and the wire and the spring on the right return to the original state of being slightly loosened downward.

When the work device is rolled from the downward right position to the set position, the left wire and spring are pulled away from the rotating body by the left connection of the work device, and are straight from the slackened state to the lower side. It tries to be stretched.
In this case, by pushing the left wire out of the rotating body, the left wire and the spring are not stretched in a straight line, but are maintained in a slightly slackened state. The left spring is unlikely to resist the rolling operation in which the device is returned from the downward-sloping position to the set position.

When the work device tilts from the set posture to the left down posture, the work device is rolled from the left down posture to the set posture by the left wire and the spring as described above, and the work device is moved from the left down posture to the set posture. The right spring is unlikely to resist the rolling operation returned to.

As described above, according to the present invention, it is possible to reduce the resistance of the right and left springs to the rolling operation in which the working device is returned from the right-down posture and the left-down posture to the set posture. The rolling operation of the working device can be stably performed in the set posture, and the rolling performance of the rolling mechanism can be improved.

In the present invention, the work device is a seedling planting device provided with a seedling stand that is driven by reciprocating and laterally feeding in the left-right direction, and a planting arm that takes out seedlings from the lower part of the seedling stand and plants them on the rice field surface. It is preferable that the right and left connecting portions are provided on the seedling stand.

A passenger-type rice transplanter, which is an example of a working machine, is equipped with a seedling planting device as a working device. The seedling planting device includes a seedling stand that is laterally driven in the left-right direction and a lower part of the seedling stand. There is a planting arm that takes out seedlings from the rice and plants them on the surface of the rice field.
According to the present invention, the right and left connecting portions are driven laterally in the left-right direction integrally with the seedling stand, and when the seedling stand is driven laterally to the right (left), the seedling stand and the seedling stand and Due to the weight of the seedlings on the seedling stand, the seedling planting device tries to incline from the set posture to the right downward posture (left downward posture).

According to the present invention, in a state where the seedling planting device is positioned in the set posture and the right and left wires and the right and left springs are slightly loosened downward, the seedling pedestal is driven laterally to the right. When the seedling planting device tilts from the set posture to the right downward posture, the right wire and the spring tend to be stretched in a straight line due to the tilt of the seedling planting device to the right downward posture as described above. ..
In addition to this, the lateral feed drive of the seedling pedestal (right connection) causes the right wire and spring to be further pulled away from the rotating body by the right connection of the seedling pedestal. It tries to be stretched in a straight line from the slackened state to the lower side.

As a result, the right wire and spring are stretched in a straight line from a slightly slackened state, and the right spring is further stretched from its natural length, and a tensile force is generated on the right spring. I have something to do.

In the above-mentioned state, the rolling control unit operates the electric motor to drive the rotating body to rotate, and the right wire is pulled by the rotating body to roll the seedling planting device from the right downward posture to the set posture. When operated, the pulling force of the right spring is applied, and the seedling planting device is quickly rolled from the right descending posture to the set posture.

In this case, in addition to pushing the left wire out of the rotating body, the left connection of the seedling stand approaches the rotating body, so that the left wire and the spring are stretched in a straight line. Instead, it returns to the original state where it loosens slightly downward, and the left spring rarely acts as a resistance to the rolling operation in which the work device is returned from the right-down posture to the set posture.

When the seedling planting device tilts from the set posture to the left downward posture, the seedling planting device is rolled from the left downward posture to the set posture by the left wire and the spring as described above, and the seedling planting device operates. The right spring is unlikely to resist the rolling operation of returning from the left downward posture to the set posture.

As described above, according to the present invention, in the seedling planting device, the seedling planting device is stabilized in the set posture by effectively utilizing the existing operation of laterally feeding the seedling stand to the right and left. As a result, the rolling operation can be performed quickly, and the rolling performance of the rolling mechanism can be improved.

In the present invention, it is preferable that the connection portion is provided with a connection position changing portion capable of changing the connection position of the spring in the connection portion.

Left-right spacing between the right wire extension and the right connection of the work equipment, and left-right distance between the left wire extension and the left connection of the work equipment. According to the present invention, by changing the connection position of the spring at the connection portion, the above-mentioned distance is slightly shorter than the natural length of the spring, or the above-mentioned distance is slightly shorter than the natural length of the spring. It is possible to set a sufficiently short state.

As a result, the right and left wires, the right and the right and the left are in a state where the right (left) spring is connected over the extension end of the right (left) wire and the right (left) connection of the working device. It is possible to set a state in which the left spring is slightly loosened downward, a state in which the left spring is sufficiently loosened downward, and the like between the rotating body and the right and left connecting portions of the working device.

According to the present invention, an appropriate interval and spring state can be selected from the above-mentioned plurality of intervals and spring states according to the type of work device, work mode, work site condition, and the like. As a result, the rolling performance of the rolling mechanism can be improved.

It is a left side view of a passenger-type rice transplanter. It is a left side view of a seedling planting device, a ground leveling device, and a rolling mechanism. It is a front view of a seedling stand and a rolling mechanism. It is a rear view of a seedling stand. It is a front view of a rolling mechanism. It is a vertical sectional left side view of a rolling mechanism. It is a perspective view of the support member which supports a seedling stay. It is a schematic diagram which shows the linkage state of a control device and each part. It is a front view which shows the relationship between the wire of a rolling mechanism and a spring. It is a front view which shows the state of a rolling operation. It is a front view which shows the state of a rolling operation. It is a front view which shows the state of a rolling operation.

1 to 12 show a passenger-type rice transplanter which is an example of a working machine. In FIGS. 1 to 12, F indicates a forward direction, B indicates a backward direction, and U indicates an upward direction. D indicates a downward direction, R indicates a right direction, and L indicates a left direction.

(Overall configuration of passenger rice transplanter)
As shown in FIGS. 1 and 2, in a passenger-type rice transplanter, a link mechanism 4 is vertically swingably supported at the rear portion of an airframe 3 provided with front wheels 1 and rear wheels 2 and extends to the rear side. A hydraulic cylinder 5 for raising and lowering the link mechanism 4 is provided.

The four-row planting type seedling planting device 6 (corresponding to a working device) is supported by the vertical link 4a at the rear of the link mechanism 4, and the seedling planting device 6 is supported by the machine body 3 via the link mechanism 4. ing. The hydraulic cylinder 5 swings the link mechanism 4 up and down to move the seedling planting device 6 up and down.

A ground leveling device 23 (corresponding to a work device) for leveling the rice field surface G is supported at the lower part on the front side of the seedling planting device 6, and the ground leveling device 23 is viewed from the side with the seedling planting device 6 and the rear wheel 2. It is placed between. A fertilizer application device 7 for supplying fertilizer to the rice field G is provided over the rear part of the machine body 3 and the seedling planting device 6.

(Overall configuration of seedling planting device)
As shown in FIGS. 1, 2 and 3, the seedling planting device 6 includes a support frame 8, a feed case 14, a planting transmission case 9, a rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like. It is provided.

The support frame 8 is arranged along the left-right direction, the feed case 14 is connected to the left-right center portion of the support frame 8, and the two planting transmission cases 9 are connected to the right portion and the left portion of the support frame 8. It is extended to the rear side.

The rotary case 10 is rotatably supported on the right and left portions of the rear portion of the planting transmission case 9, and the planting arms 11 are supported on both ends of the rotary case 10. The seedling stand 13 is supported so as to be movable in the left-right direction.

The feed case 14 is rotatably supported around the axial core P1 in the front-rear direction below the vertical link 4a at the rear of the link mechanism 4, and the seedling planting device 6 is rotatably supported by the machine body 3 around the axial core P1. Has been done.

The power of the engine (not shown) of the airframe 3 is transmitted from the planting clutch (not shown) to the internal transmission mechanism (not shown) of the feed case 14 via the transmission shaft 35, and the feed case 14 The seedling pedestal 13 is driven laterally in a reciprocating manner in the left-right direction in a predetermined stroke by a lateral feed shaft (not shown) provided in.

The power transmitted to the transmission mechanism of the feed case 14 is transmitted to the rotating case 10. As the seedling stand 13 is laterally driven in the left-right direction, the rotary case 10 is rotationally driven, and the planting arm 11 alternately takes out seedlings from the lower part of the seedling stand 13 and plants them on the rice field G. ..

(Overall configuration of fertilizer application device)
As shown in FIGS. 1 and 2, the fertilizer application device 7 is provided with a hopper 15, a feeding portion 16, a blower 17, a groove making device 18, a hose 19, and the like.

A hopper 15 for storing fertilizer and a feeding portion 16 are supported on the rear portion of the driver's seat 20 in the machine body 3, and a blower 17 is provided on the left lateral outer portion of the feeding portion 16. A grooving device 18 is attached to the float 12, four grooving devices 18 are provided, and four hoses 19 are connected to the feeding portion 16 and the grooving device 18.

The power of the engine (not shown) of the machine body 3 is transmitted to the feeding section 16 via the fertilizer application clutch (not shown), the fertilizer of the hopper 15 is fed by the feeding section 16, and the hose is fed by the transport wind of the blower 17. It is supplied to the groove making device 18 through 19. Fertilizer is supplied from the groove making device 18 to the groove of the field surface G while the groove is formed on the rice field surface G by the groove making device 18.

(Overall configuration of ground leveling equipment)
As shown in FIGS. 1 and 2, a ground leveling device 23 for leveling the rice field surface G is supported at the lower part of the front portion of the seedling planting device 6 so as to be located on the front side with respect to the support frame 8.

As described in the above (overall configuration of the seedling planting device), the seedling planting device 6 and the ground leveling device 23 are supported by the machine body 3 so as to be rollable around the axis P1. , It is integrally supported by the machine body 3 so that it can be rolled around the shaft core P1.

The right and left support cases 27 supported by the right and left portions of the support frame 8 extend obliquely downward from the support frame 8 on the front side. A drive shaft 28 is rotatably supported in the left-right direction over the front portions of the right and left support cases 27, and a large number of ground leveling bodies 29 are integrally rotatably attached to the drive shaft 28. The cover 30 is arranged in the left-right direction on the rear side of the drive shaft 28 and the ground leveling body 29.

The power transmitted to the seedling planting device 6 is branched and transmitted to the drive shaft 28 via a transmission chain (not shown) inside the support case 27, and the drive shaft 28 and the ground leveling body 29 are counterclockwise in FIG. The surface G is leveled by the ground leveling body 29, which is rotationally driven in the clockwise direction. The cover 30 stops the scattering of muddy water from the ground leveling body 29 to the seedling planting device 6.

(Support structure for seedling stand of seedling planting device)
As shown in FIGS. 2 and 3, the support rail 21 is supported along the left-right direction on the upper part of the planting transmission case 9. The lower part of the seedling stand 13 is supported by the support rail 21 so as to be movable along the left-right direction, and the seedling stand 13 extends diagonally from the planting transmission case 9 to the upper side on the front side in a side view. There is.

The support frame 22 is connected to the right and left portions of the support frame 8 and extends upward, and the support frame 24 is connected to the upper part of the support frame 22. A support rail 25 is connected to the upper part of the seedling rest 13 along the left-right direction, and a roller 26 supported by the upper part of the support frame 22 is inserted into the support rail 25.

As a result, the lower part of the seedling stand 13 is supported by the planting transmission case 9 and the support rail 21 so as to be movable in the left-right direction, and the upper part (support rail 25) of the seedling stand 13 is supported by the support frame 22 and the roller 26. It is supported so as to be movable in the left-right direction, and the seedling stand 13 is laterally fed and driven in the left-right direction with a predetermined stroke.

(Composition related to seedling stand)
As shown in FIG. 4, the seedling pedestal 13 is provided with four seedling laying surfaces 13a, and a vertical wall-shaped partitioning portion 13b for partitioning between the seedling laying surfaces 13a. Two vertical feed belts 36 are provided on each of the seedling rest surfaces 13a of the seedling stand 13, and a seedling sensor 49 is provided between the vertical feed belts 36.

The seedling sensor 49 detects the presence of seedlings on the seedling surface 13a of the seedling stand 13 when the seedlings come into contact with the seedling sensor 49. As the seedlings are planted by the planting arm 11, the seedlings are consumed up to the position of the seedling sensor 49, and when the seedlings do not come into contact with the seedling sensor 49, the number of seedlings on the seedling surface 13a of the seedling stand 13 decreases. This is detected by the seedling sensor 49 and an alarm is activated.

As shown in FIGS. 1, 2 and 4, three seedling stays 53 are provided on each of the seedling surface 13a of the seedling table 13, and the seedlings are lifted on the seedling surface 13a of the seedling table 13. However, it is suppressed by the seedling stay 53. The support structure of the seedling stay 53 will be described below.

As shown in FIGS. 2, 4 and 7, the support member 59 is connected to the upper part of the three partition portions 13b of the seedling stand 13. The support member 59 has a support portion 59a, a seat portion 59b, a reinforcing portion 59c, and a support portion 59d.

In the support member 59, the seat portion 59b is connected to the lower portion of the strut portion 59a, and two reinforcing portions 59c are connected over the strut portion 59a and the seat portion 59b, so that the strut portion 53a, the seat portion 59b, and the reinforcing portion 59c are connected. However, it is integrally formed of synthetic resin. The seat portion 59b is bolted to the partition portion 13b of the seedling stand 13, and the support portion 59d made of synthetic resin is attached to the support portion 59a so that the vertical position can be changed.

As shown in FIGS. 2 and 4, the support member 62 is connected to the lower part of the three partition portions 13b of the seedling stand 13, and the support rod 63 is attached to the support member 62 along the left-right direction. There is. The support rod 64 is attached to the support portion 59d of the support member 59 along the left-right direction.

Three seedling stays 53 are attached over the support rods 63 and 64 on one seedling surface 13a of the seedling stand 13.
The seedling stay 53 at the center of one seedling resting surface 13a of the seedling resting table 13 is arranged between the vertical feed belts 36 in the rear view and the plan view, and is arranged so as to overlap the seedling sensor 49. The right and left seedling stays 53 of one seedling resting surface 13a of the seedling resting table 13 are arranged so as to overlap the vertical feed belt 36 in the rear view and the plan view.

(Overall configuration of the rolling mechanism that rolls the seedling planting device)
As shown in FIGS. 1, 2 and 3, the rolling mechanism 31 is connected to the upper part of the vertical link 4a of the link mechanism 4.

As shown in FIGS. 5 and 6, the rolling mechanism 31 includes a substrate 32, a support bracket 37, a drive shaft 38, a rotating body 39, a first shaft support portion 41, a second shaft support portion 42, an electric motor 45, and a gear mechanism. 46, a right wire 47, a left wire 48, a stop sensor 50, a stop operation portion 51, an elastic body 52, a contact portion 54, a stopper portion 55, a cover 56, and the like are provided.

The substrate 32 is formed by bending a metal plate material, and the lower portion of the substrate 32 is connected to the upper portion of the vertical link 4a of the link mechanism 4. The support bracket 37 is formed by bending a metal plate material at an angle in a side view, and connects the support bracket 37 to the substrate 32 so that the support bracket 37 is arranged on the front side with a space from the substrate 32. Has been done.

A cover 56 made of synthetic resin is provided, and the cover 56 is attached to the substrate 32. The cover 56 provides a support bracket 37, a drive shaft 38, a rotating body 39, a first shaft support portion 41, a second shaft support portion 42, a stop sensor 50, a stop operation portion 51, an elastic body 52, a contact portion 54, and a stopper, which will be described later. Part 55 and the like are covered.

(Structure related to support and rotational drive of drive shaft and rotating body in rolling mechanism)
As shown in FIGS. 5 and 6, the first shaft support portion 41 is attached to the opening 37a of the support bracket 37, and the second shaft support portion 42 is attached to the opening 32a of the substrate 32. .. The first shaft support portion 41 and the second shaft support portion 42 are provided with through holes extending in the front-rear direction and have the same shape, and are integrally formed of synthetic resin.

The drive shaft 38 is rotatably supported by the first shaft support portion 41 and the second shaft support portion 42, and is located between the first shaft support portion 41 and the second shaft support portion 42 on the drive shaft 38. , The rotating body 39 is supported so as to be integrally rotatable with the drive shaft 38. The drive shaft 38 and the rotating body 39 are integrally rotatably supported around the rotating shaft core P2 in the front-rear direction of the first shaft support portion 41 and the second shaft support portion 42.

The drive shaft 38 penetrates the second shaft support portion 42 and projects to the opposite side (rear side) of the rotating body 39, and the drive gear 40 is opposed to the rotating body 39 from the second shaft support portion 42 on the drive shaft 38. It is connected to the part that protrudes to the side (rear side).

The drive shaft 38 penetrates the first shaft support portion 41 and projects to the opposite side (front side) of the rotating body 39, and protrudes from the first shaft support portion 41 of the drive shaft 38 to the opposite side (front side) of the rotating body 39. A washer 43 is connected to the portion by a bolt 44. The position of the drive shaft 38 in the front-rear direction is determined by the drive gear 40 and the washer 43.

The electric motor 45 and the gear mechanism 46 are connected to the substrate 32, and the pinion gear 46a of the gear mechanism 46 is engaged with the drive gear 40 while entering the opening 32b of the substrate 32. The electric motor 45 rotationally drives the pinion gear 46a of the gear mechanism 46 to one side and the other side, the drive gear 40 is rotationally driven to one side A1 and the other side A2, and the drive shaft 38 and the rotating body 39 are one side. It is rotationally driven to the side A1 and the other side A2.

(Structure of rotating body, right and left wires in rolling mechanism)
As shown in FIGS. 5 and 6, the rotating body 39 has a pulley shape in which two groove portions 39a and 39b are formed on the outer peripheral portion, and is integrally formed of a synthetic resin.

As shown in FIGS. 3, 5 and 6, the right wire 47 is wound around the groove 39a of the rotating body 39 and extends from the upper side to the right side of the rotating body 39. In the seedling stand 13, the bracket 25a (corresponding to the connecting portion) is connected to the right portion of the support rail 25. The right spring 33 is connected to the extending end portion 47a of the right wire 47 and the right bracket 25a of the support rail 25.

As a result, the right spring 33 is connected to the right bracket 25a of the support rail 25, which is on the right side of the rotating body 39 in the seedling planting device 6, and the extending end portion 47a of the right wire 47. ing.

The left wire 48 is wound around the groove 39b of the rotating body 39 and extends from the upper side to the left side of the rotating body 39. In the seedling stand 13, the bracket 25b (corresponding to the connecting portion) is connected to the left portion of the support rail 25. The left spring 34 is connected to the extending end 48a of the left wire 48 and the left bracket 25b of the support rail 25.

As a result, the left spring 34 is connected to the left bracket 25b of the support rail 25 on the left side with respect to the rotating body 39 in the seedling planting device 6 and the extending end portion 48a of the left wire 48. ing.

As shown in FIG. 3, a plurality of connection holes 25c (corresponding to connection position changing portions) are opened in the right and left brackets 25a and 25b of the support rail 25 so as to be lined up in the left-right direction. The right and left springs 33 and 34 are hooked and connected to one of the plurality of connection holes 25c of the support rail 25, so that the right and left springs 33 and 34 are right and left of the support rail 25. It is connected to the brackets 25a and 25b of.

(Structure of stop sensor and elastic body in rolling mechanism)
As shown in FIGS. 5 and 6, a limit switch type stop sensor 50 is connected to the support bracket 37, and the contact portion 50a of the stop sensor 50 extends from the stop sensor 50 toward the upper rotating body 39. It has been issued.

An elastic body 52 made of a metal leaf spring is viewed from the direction (front-back direction) of the rotating shaft core P2 of the rotating body 39, and is located between the rotating body 39 and the contact portion 50a of the stop sensor 50. It is arranged along the rotation direction (left-right direction) of 39.

The base 52a of the elastic body 52 is connected to the rear side (board 32 side) of the stop sensor 50, and the detent portion 52b extending from the base 52a of the elastic body 52 is the opening 37b of the support bracket 37. It is inserted in.

The elastic body 52 extends upward and to the right from the base portion 52a of the elastic body 52, and is arranged between the rotating body 39 and the contact portion 50a of the stop sensor 50. The elastic body 52 is formed in an arc shape that protrudes toward the rotating body 39 (upper side) with respect to the contact portion 50a of the stop sensor 50 when viewed from the direction (front-back direction) of the rotating shaft core P2 of the rotating body 39. ..

The end portion of the elastic body 52 is bent in a channel shape in a front view to form an engaging portion 52c, and the engaging portion 52c is engaged with the receiving portion 37c of the support bracket 37. While the elastic body 52 tries to approach the rotating body 39 side (upper side) by its own urging force, the engaging portion 52c of the elastic body 52 is engaged with the receiving portion 37c of the support bracket 37. As a result, the elastic body 52 is stopped at a predetermined position shown in FIG.

When the elastic body 52 tries to move downward from the predetermined position shown in FIG. 5 with respect to the rotating body 39, the engaging portion 52c of the elastic body 52 separates downward from the receiving portion 37c of the support bracket 37. A displacement of the elastic body 52 away from the predetermined position shown in FIG. 5 with respect to the rotating body 39 is allowed.

(Structure of stop operation part, contact part and stopper part in rolling mechanism)
As shown in FIGS. 5 and 6, a stop operation unit 51 made of synthetic resin is integrally rotatably provided with the rotating body 39. The stop operation unit 51 has a relatively large left-right width.

A contact portion 54 made of synthetic resin is integrally rotatably provided with the rotating body 39. The contact portion has a left-right width narrower than that of the stop operation portion 51, and is provided on the rotating body 39 so as to be located at the left-right center portion of the stop operation portion 51 in front view.
The stopper portion 55 is provided on the substrate 32 so as to be located below the second shaft support portion 42 in a side view.

(Structure related to rolling control unit)
As shown in FIG. 8, an inclination sensor 57 for detecting the inclination angle of the seedling planting device 6 in the horizontal direction with respect to the horizontal plane is attached to the feed case 14. The detection value of the tilt sensor 57 is input to the control device 60 provided in the machine body 3, and the detection signal of the stop sensor 50 is input to the control device 60.

A dial operation type setting switch 58 is provided on the machine body 3, and an operation signal of the setting switch 58 is input to the control device 60. The setting switch 58 sets the set tilt angle, and the set tilt angle can be arbitrarily set from the horizontal position and the horizontal position to the right-down angle and the left-down angle.

As shown in FIGS. 3, 5 and 6, when the drive shaft 38 and the rotating body 39 are rotationally driven to one side A1 by the electric motor 45, the right wire 47 is wound around the rotating body 39 and the rotating body 39 The left wire 48 is drawn out from the rotating body 39 and pushed out from the rotating body 39. As a result, the seedling planting device 6 (ground leveling device 23) is rolled so that the right portion of the seedling planting device 6 rises and the left portion of the seedling planting device 6 descends.

When the drive shaft 38 and the rotating body 39 are rotationally driven to the other side A2 by the electric motor 45, the left wire 48 is wound around the rotating body 39 and pulled by the rotating body 39, and the right wire 47 is the rotating body. It is fed out from 39 and pushed out from the rotating body 39. As a result, the seedling planting device 6 is rolled so that the left portion of the seedling planting device 6 is raised and the right portion of the seedling planting device 6 is lowered.

As shown in FIG. 8, the rolling control unit 61 is provided in the control device 60 as software. Based on the operation position of the setting switch 58, the detection value of the tilt sensor 57, and the detection signal of the stop sensor 50, the rolling control unit 61 (control device 60) causes the electric motor 45 of the rolling mechanism 31 to be described later (of the rolling mechanism). It is operated as described in (Operating state).

As a result, the seedling planting device 6 and the rearranging device 23 are rolled so that the detected value of the tilt sensor 57 becomes the set tilt angle of the setting switch 58, and the seedling planting device 6 and the ground leveling device 23 set the set tilt angle. The rolling operation is performed to the set posture corresponding to.

(State of wire and spring in rolling mechanism)
As shown in FIGS. 3 and 9, the seedling planting device 6 is located in a set posture in which the detection value of the tilt sensor 57 is the set tilt angle of the setting switch 58, and the seedling pedestal 13 is predetermined to be driven laterally. In the state of being located at the center position of the stroke, the right and left wires 47 and 48 are extended from the rotating body 39 to the right and left in parallel (horizontal) with the seedling planting device 6 in the front view. Suppose.

The right bracket 25a of the support rail 25 is located at the position of the virtual extension line extending from the right wire 47, and the left of the support rail 25 is located at the position of the virtual extension line extending from the left wire 48. The bracket 25b is located.

In the above-mentioned state, the distance W1 in the left-right direction between the extending end portion 47a of the right wire 47 and the right bracket 25a of the support rail 25 (seedling planting device 6) is the natural distance W1 of the right spring 33. It is set to be shorter than the length L1.
The distance W2 in the left-right direction between the extending end of the left wire 48 and 48a and the left bracket 25b of the support rail 25 (seedling planting device 6) is larger than the natural length L2 of the left spring 34. It is set to a short one.

In the above-mentioned state, as shown in FIGS. 3 and 10, the extension ends 47a and 48a of the right and left wires 47 and 48 and the right and left brackets 25a of the support rail 25 (seedling planting device 6) are used. , 25b (connecting holes 25c), right and left springs 33, 34 are connected.

As a result, the right and left springs 33 and 34 try to return to their natural lengths L1 and L2, and due to the weight of the right and left springs 33 and 34, the right and left wires 47 and 48 and the right and left springs 33 , 34 are slightly slackened downward between the rotating body 39 and the right and left brackets 25a and 25b of the support rail 25 (seedling planting device 6).

As shown in FIG. 3, when the right and left springs 33 and 34 are connected to the connection hole 25c of the connection holes 25c of the support rail 25 far from the rolling mechanism 31, the intervals W1 and W2 are the right and left springs 33. , 34 can be obtained in a slightly shorter state than the natural lengths L1 and L2. As a result, the slack of the right and left wires 47 and 48 and the right and left springs 33 and 34 becomes small.

When the right and left springs 33 and 34 are connected to the connection hole 25c close to the rolling mechanism 31 of the connection holes 25c of the support rail 25, the intervals W1 and W2 are the natural lengths L1 of the right and left springs 33 and 34. A sufficiently short state can be obtained with respect to L2. As a result, the slack of the right and left wires 47 and 48 and the right and left springs 33 and 34 becomes large.

The states shown in FIGS. 3 and 10 are states in which the horizontal position is set as the set tilt angle by the setting switch 58. Even if the set tilt angle is set from the horizontal position to the right-down angle and the left-down angle by the setting switch 58, the same state as described above is obtained.

In the states shown in FIGS. 9 and 10, the interval W1 and the interval W2 have the same value, and the natural length L1 of the right spring 33 and the natural length L2 of the left spring 34 have the same value.
When the right part of the seedling planting device 6 is a little heavier than the left part or the left part of the seedling planting device 6 is a little heavier than the right part, it depends on the weight balance in the left-right direction of the seedling planting device 6. By connecting the right and left springs 33 and 34 to different connection holes 25c among the connection holes 25c of the support rail 25, the distance W1 and the distance W2 can be set to slightly different values, or the right side can be set to a slightly different value. The natural length L1 of the spring 33 and the natural length L2 of the left spring 34 may be set to slightly different values.

(Operating state of rolling mechanism)
It is assumed that the seedling planting device 6 is tilted from the set posture to the right downward posture as shown in FIG. 11 from the state shown in FIG.

When the seedling planting device 6 is tilted from the set posture to the right downward posture, the shaft core P1 and the rolling mechanism 31 are separated in the vertical direction (see FIG. 3), so that the support rail 25 (seedling planting device 6) The right bracket 25a of the above is in a state of being separated from the rotating body 39 to the right, and the left bracket 25b of the support rail 25 (seedling planting device 6) is in a state of approaching the rotating body 39.

As a result, the right wire 47 and the spring 33 are pulled by the right bracket 25a of the support rail 25 (seedling planting device 6) to the side away from the rotating body 39 to the right, and are straight from the state of being loosened downward. It tries to be stretched.
On the other hand, the left wire 48 and the spring 34 may be pushed toward the rotating body 39 by the left bracket 25b of the support rail 25 (seedling planting device 6) so as to be further slackened downward. And.

From the state shown in FIG. 11, as shown in FIG. 12, the electric motor 45 is operated by the rolling control unit 61 (control device 60) based on the detected value of the tilt sensor 57, and the rotating body 39 rotates to one side A1. Driven.

As a result, the right wire 47 and the spring 33 are pulled in a straight line from the slackened state to the lower side, and the right wire 47 is pulled by the rotating body 39, and the right wire 47 and the spring 33 pull the right wire 47 and the spring 33. , The seedling planting device 6 is rolled from the downward right posture to the set posture.

When the seedling planting device 6 is rolled from the downward right posture to the set posture, the left wire 48 and the spring 34 are moved from the rotating body 39 by the left bracket 25b of the support rail 25 (seedling planting device 6). It is pulled to the distant side and tries to be stretched in a straight line from the slackened state to the lower side.

In this case, the rotating body 39 is rotationally driven to one side A1 and the left wire 48 is pushed out from the rotating body 39, so that the left wire 48 and the spring 34 are not stretched in a straight line. The seedling planting device 6 is maintained in a slightly slackened state, and the left spring 34 is unlikely to resist the rolling operation in which the seedling planting device 6 is returned from the right descending posture to the set posture.

When the seedling planting device 6 is rolled from the downward right posture to the set posture and the detection value of the tilt sensor 57 reaches the set tilt angle, the rolling control unit 61 (control device 60) operates and operates the electric motor 45 to rotate. The body 39 is slightly rotationally driven to the other side A2 and returns to the position shown in FIG. 10, and the right and left springs 33 and 34 are right and left of the rotating body 39 and the support rail 25 (seedling planting device 6). It returns to the original state where it loosens slightly downward between the brackets 25a and 25b.

When the seedling planting device 6 is tilted from the set posture to the left downward posture, the seedling planting device 6 is rolled from the left downward posture to the set posture by the left wire 48 and the spring 34 as described above. The right spring 33 rarely acts as a resistance to the rolling operation in which the planting device 6 is returned from the left downward posture to the set posture.

(Operating state of the rolling mechanism that takes into account the lateral feed drive of the seedling stand)
In the seedling planting device 6, when the seedling setting table 13 is laterally fed to the right (left), the seedling planting device 6 moves downward from the set posture due to the weight of the seedling setting table 13 and the seedlings of the seedling setting table 13. Try to lean to the posture (downward left posture).

When the seedling stand 13 is laterally driven to the right (left), the right bracket 25a of the support rail 25 (seedling planting device 6) is further separated from the rotating body 39 to the right, and the support rail 25 (seedling) The left bracket 25b of the planting device 6) is in a state of being closer to the rotating body 39.

In the state shown in FIG. 10, when the seedling planting device 6 tilts from the set posture to the right downward posture by laterally feeding the seedling stand 13 to the right, as described in the above-mentioned (operating state of the rolling mechanism). The right wire 47 and the spring 33 are brought into a straight line by the inclination of the seedling planting device 6 to the right downward posture.

In addition to this, the side where the right wire 47 and the spring 33 are separated from the rotating body 39 by the right bracket 25a of the support rail 25 (seedling planting device 6) by the lateral feed drive of the seedling stand 13 to the right. It is pulled further and tries to be stretched in a straight line from the state of being loosened downward.

As a result, the right wire 47 and the spring 33 are in a state of being stretched in a straight line from a state of being slightly loosened downward, and a state of being further stretched from the natural length l1 of the right spring 33, and the right spring 33. A tensile force may be generated on the spring.

In the above-mentioned state, the electric motor 45 is operated by the rolling control unit 61 (control device 60), the rotating body 39 is rotationally driven to one side A1, and the right wire 47 is pulled by the rotating body 39. When the seedling planting device 6 is rolled from the right descending posture to the set posture, the pulling force of the right spring 33 is applied, and the seedling planting device 6 changes from the right descending posture to the set posture. Rolling operation is performed quickly.

When the rotating body 39 is rotationally driven to one side A1, the left wire 48 is pushed out from the rotating body 39, and the left bracket 25b of the support rail 25 (seedling planting device 6) is moved to the rotating body 39. By further approaching, the left wire 48 and the spring 34 are not stretched in a straight line, but are maintained in a slightly slackened state, and the seedling planting device 6 is in a downward-sloping posture. The left spring 34 rarely acts as a resistance to the rolling operation of returning to the set posture.

When the seedling planting device 6 is tilted from the set posture to the left downward posture, the seedling planting device 6 is rolled from the left downward posture to the set posture by the left wire 48 and the spring 34 as described above. The right spring 33 rarely acts as a resistance to the rolling operation in which the planting device 6 is returned from the left downward posture to the set posture.

(Operating state of the rolling control unit based on the detection signal of the stop sensor)
As described above, when the drive shaft 38 and the rotating body 39 are rotationally driven by the electric motor 45 to one side A1 and the other side A2, as shown in FIG. 5, the stop operation unit 51 moves to one side A1 and the other side A2. Rotates to approach the elastic body 52.

As shown in FIGS. 5 and 6, when the drive shaft 38 and the rotating body 39 are rotationally driven to one side A1 by the electric motor 45 and the drive shaft 38 and the rotating body 39 reach the left rolling limit, the stop operation unit The end portion 51a of 51 comes into contact with the elastic body 52, the elastic body 52 elastically deforms downward, and the elastic body 52 comes into contact with the contact portion 50a of the stop sensor 50.

As a result, a stop signal is output from the stop sensor 50 to the rolling control unit 61 (control device 60), and the rolling control unit 61 (control device 60) stops the electric motor 45.

In this case, the drive shaft 38 and the rotating body 39 may rotate to one side A1 beyond the left rolling limit due to a delay in the stop operation of the electric motor 45 or the like. When the drive shaft 38 and the rotating body 39 rotate to one side A1 beyond the left rolling limit, the contact portion 54 hits the stopper portion 55, so that the drive shaft 38 and the rotating body 39 are forcibly stopped.

When the drive shaft 38 and the rotating body 39 are rotationally driven to the other side A2 by the electric motor 45 and the drive shaft 38 and the rotating body 39 reach the right rolling limit, the end portion 51b of the stop operation unit 51 becomes the elastic body 52. Upon contact, the elastic body 52 elastically deforms downward, and the elastic body 52 comes into contact with the contact portion 50a of the stop sensor 50.

As a result, a stop signal is output from the stop sensor 50 to the rolling control unit 61 (control device 60), and the rolling control unit 61 (control device 60) stops the electric motor 45.

In this case, the drive shaft 38 and the rotating body 39 may rotate to the other side A2 beyond the right rolling limit due to a delay in the stop operation of the electric motor 45 or the like. When the drive shaft 38 and the rotating body 39 rotate to the other side A2 beyond the right rolling limit, the contact portion 54 hits the stopper portion 55, so that the drive shaft 38 and the rotating body 39 are forcibly stopped.

(First alternative form of carrying out the invention)
In the seedling planting device 6, even if the seedling stand 13 is laterally driven to the right (left), right and left brackets 25a and 25b may be provided at fixed portions that do not move together with the seedling stand 13. ..
In this case, the right and left brackets 25a and 25b may be provided on the upper parts of the right and left support frames 22.

(Second alternative form of carrying out the invention)
A plurality of connection holes 25c may be opened in the right and left brackets 25a and 25b of the support rail 25 so as to be arranged in the vertical direction, or may be opened so as to be arranged in the diagonal direction.

(Third alternative form of carrying out the invention)
In FIG. 10, the right and left wires 47, 48 and the right and left wires 47, 48 are arranged so that the right and left wires 47, 48 and the right and left springs 33, 34 are arranged in a horizontal straight line without loosening downward. , A guide member (not shown) that supports the right and left springs 33, 34 may be provided.
In this case, an auxiliary mechanism (not shown) for assisting the right and left wires 47 and 48 is provided so that the right and left springs 33 and 34 are compressed from the natural lengths L1 and L2 to the intervals W1 and W2. May be good.

The present invention can be applied not only to a riding type rice transplanter but also to a working machine such as a riding type direct sowing machine equipped with a sowing device (corresponding to a working device) (not shown) for supplying seeds to the rice field surface. It can also be applied to work machines that are not equipped with.

6 Seedling planting device (working device)
11 Planting arm 13 Seedling stand 23 Ground leveling device (working device)
25a bracket (connection part)
25b bracket (connection part)
25c connection hole (connection position change part)
31 Rolling mechanism 33 Spring 34 Spring 39 Rotating body 45 Electric motor 47 Wire 47a Extending end 48 Wire 48a Extending end 57 Tilt sensor 61 Rolling control unit A1 One side A2 Other side G Field L1 Natural length L2 Natural length P1 axis Core W1 interval W2 interval

Claims (3)

It is equipped with a work device that is supported by the machine so that it can roll around the axis in the front-rear direction, a tilt sensor that detects the tilt angle of the work device in the left-right direction, and a rolling mechanism that rolls the work device. ,
To the rolling mechanism
A rotating body that is rotatably supported, an electric motor that rotationally drives the rotating body to one side and the other side, and right and left surfaces that are wound around the rotating body and extend to the right and left sides from the rotating body. Wires are provided,
A right spring connected to the rotating body in the working device over the right connecting portion and the right extending end portion of the wire.
A left spring connected to the rotating body in the working device over the left connecting portion and the left extending end of the wire is provided.
In a state where the work device is positioned in a set posture in which the detection value of the tilt sensor is the set tilt angle, the right and left wires extend from the rotating body to the right and left sides in parallel with the work device in a front view. The distance between the extension ends of the right and left wires in the extended state and the right and left connections in the left-right direction is shorter than the natural length of the right and left springs. Set to
The electric motor rotationally drives the rotating body to one side and the other side, and the right and left wires are pulled by the rotating body and pushed out from the rotating body, so that the detection value of the tilt sensor is obtained. A work machine provided with a rolling control unit that rolls the work device so as to have a set inclination angle. The work device is a seedling planting device provided with a seedling stand that is driven by reciprocating and laterally feeding in the left-right direction and a planting arm that takes out seedlings from the lower part of the seedling stand and plants them on the rice field surface.
The working machine according to claim 1, wherein the right and left connecting portions are provided on the seedling stand. The working machine according to claim 1 or 2, wherein a connection position changing portion capable of changing the connecting position of the spring in the connecting portion is provided in the connecting portion.

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