JP2016185097A - Transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transplanter having a regulation body for regulating stopping of a planting device out of a specific housing range preset during disconnection by a planting clutch, allowing the disconnection by the planting clutch to be smoothly performed.SOLUTION: The transplanter includes: planting devices 18 for planting seedlings to a field; a planting clutch 52 for intermittently transmitting the power from an engine 7 to the side of the planting device 18; and a branching part 56 for branching the power transmitted from the planting clutch 52 into the side of a plurality of planting devices 18. A notch 65 is formed on a rotary body 66 constituting the planting clutch 52. When being positioned out of the notch 65, the regulation body 68 regulates disconnection by the planting clutch 52. A normal and reverse rotation giving mechanism 53 is arranged on the downstream side of transmission of the planting clutch 52 and on the upstream side of transmission of the branching part 56 so as to cause the rotary body 66 to reversely rotate during disconnection by the planting clutch 52.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a transplanter provided with a planting device for planting seedlings in a field.

  A planting device for planting seedlings in a field, a planting clutch for intermittently transmitting power transmitted from the engine to the planting machine, and a plurality of planting devices for transmitting power transmitted from the planting clutch A restricting body that regulates the cutting operation of the planting clutch when it is located outside the range of the notch. Conventionally, a transplanter described in Patent Document 1 configured so that the planting device stops within a predetermined accommodation range when the planting clutch is cut and operated is known.

JP 2011-50310 A

  According to the above document, when the planting clutch is operated to be disconnected, the planting device can be stopped at a predetermined storage position with a simple configuration. On the other hand, the planting clutch is disconnected. When the planting clutch is connected and operated by the sliding resistance generated between the end of the notch of the rotating body and the regulating body due to the driving force remaining on the transmission downstream side when the rotating body is operated, the rotating body is There is a problem that the planting clutch may not be smoothly connected due to being caught by the regulating body.

  The present invention provides an intermittent operation by a planting clutch in a transplanting machine provided with a regulating body that regulates the planting device from stopping when the planting clutch is disengaged outside a predetermined predetermined accommodation range. It is an object of the present invention to provide a transplanter that can be used.

  In order to solve the above problems, firstly, a planting device 18 that performs planting work of seedlings on a farm field, a planting clutch 52 that intermittently transmits power transmitted from the engine 7 to the planting device 18 side, A branch portion 56 for branching the power transmitted from the planting clutch 52 to the plurality of planting devices 18, and a notch 65 is formed in the rotating body 66 constituting the planting clutch 52. In the transplanting machine provided with the regulating body 68 that regulates the cutting operation of the planting clutch 52 when located outside the range, the transmission downstream side of the planting clutch 52 and the transmission upstream of the branch portion 56 A forward / reverse rotation imparting mechanism 53 is provided on the side, and is configured to impart reverse rotation to the rotating body 66 when the planting clutch 52 is disconnected.

  Second, the planting clutch 52 is characterized in that the end side of the notch 65 of the rotating body 66 and the regulating body 68 are in line contact.

  According to the transplanter of the present invention configured as described above, when the planting clutch is disengaged, reverse rotation is imparted to the rotating body by the forward / reverse rotation mechanism, so that the remaining driving force The sliding resistance generated between the positive rotation side end of the notch of the rotating body and the regulating body can be suppressed, and the on / off operation of the planting clutch can be performed smoothly.

  Further, according to the planting clutch, the regulation body rotates when the planting clutch is operated to cut off, according to the configuration in which the end side of the cutout portion of the rotating body is in line contact with the regulation body. When the planting clutch is engaged by engaging with the notch side of the body, the sliding resistance of the rotating body against the regulating body can be configured to be low, so that the rotating body is prevented from being caught on the regulating body side, On / off operation becomes smoother.

1 is an overall side view of a riding rice transplanter as an example to which a transplanter of the present invention is applied. It is the principal part side sectional view which showed the structure of the planting part. It is a side view which shows the movement locus | trajectory of the planting claw in the middle of planting work. It is a power transmission system diagram of this riding rice transplanter. (A) And (B) is the perspective view and top view which showed the planting clutch. (A) And (B) is the top view and side view which showed the engagement state of the planting clutch, (C) And (D) is the top view and side view which showed the cutting state of the planting clutch. is there. (A) And (B) is the side view which showed the structure of the forward / reverse rotation provision mechanism, and principal part sectional drawing. (A) And (B) is the perspective view and side view which showed the stopper member. (A) And (B) is the bottom view and front view which showed the connection state of the planting clutch. (A) And (B) is the bottom view and front view which showed the state which the regulation pin drive to the normal rotation direction and contacted the notch part. (A) And (B) is the perspective view and the principal part enlarged view which showed the state which the regulation pin drive to the normal rotation direction and contacted the notch part. (A) And (B) is the bottom view and front view which showed the state which the regulation pin driven in the reverse rotation direction and contacted the notch part. (A) And (B) is the perspective view and the principal part enlarged view which showed the state which the regulation pin was driven to the reverse rotation direction and contacted the notch part.

Embodiments of the present invention will be described below based on the illustrated example.
FIG. 1 is an overall side view of a riding rice transplanter as an example to which the transplanter of the present invention is applied. FIG. 2 is a side sectional view of a main part showing the configuration of a planting part. FIG. It is a side view which shows the movement locus | trajectory of the planting nail | claw in the middle of attachment work. The illustrated riding rice transplanter includes a traveling machine body 3 having a pair of left and right front wheels 1, 1 and rear wheels 2, 2, and a planting that is connected to a rear end portion of the traveling machine body 3 through a lifting link 4 so as to be movable up and down. And a work machine 6.

  A control unit 9 on which an operator gets is installed behind the hood 8 that houses the engine 7 in the traveling machine body 3. A steering handle 12 for performing a steering operation is arranged in front of the seat 11 on which the operator sits in the control unit, and power to the planting work machine 6 is intermittently provided on the side of the seat 11 by a back-and-forth swing operation. A planting lever that is an operating tool to be operated is supported.

  The planting work machine 6 includes a seedling platform 17 in which a seedling placing surface 16 is formed on the back side with a steeply upward slope toward the front, and a planting unit (planting) disposed immediately below the seedling platform. Attachment device) 18. The planting part 18 extends in the front-rear direction and is supported by and fixed to the frame part side of the planting work machine 6. The planting part 18 can be driven to rotate about a horizontal axis located at the rear end of the planter case 19. A rotary case 21 that is supported at the center side, a planting arm 23 that rotates on both ends of the rotary case 21 via an output shaft, and a planting claw 24 that is supported by the planting arm 23. (See FIG. 2).

  The rotary case 21 includes a sun gear 26 that rotates around a drive shaft 22 to which power from the engine 7 is input, a pair of intermediate gears 27, 27 that mesh with the sun gear 26, and both intermediate gears 27. An inconstant speed gear train composed of meshing planetary gears 28 and 28 is accommodated so that the posture of the planting claw 24 supported by the planting arm 23 is controlled.

  In the rotary case 21, a brake arm 31 that rotates about the axis of the intermediate gear 27, a brake cam 32 provided around the axis of the planetary gear 28, and the brake arm 31 on the brake cam 32 side. A brake mechanism including an elastic body 33 that is urged so as to abut is provided. By the brake mechanism, the path of the planting claw 24 can be made to be unequal, and backlash generated in the unequal side gear train in the rotary case 21 can be absorbed.

  The planting portion 18 having the structure rotates around the sun gear 26 while the intermediate gear 27 revolves around the sun gear 26 due to the rotation of the rotary case 21 in conjunction with the rotation of the drive shaft 22, and the planetary gear 28 rotates around the reverse direction. While revolving, the drive shaft 34 that rotationally drives the planting arm 23 rotates. The planting claw 24 supported by the planting arm 23 by the rotation of the drive shaft 34 and the rotary operation of the rotary case 21 changes the posture as shown in FIG. It is configured to draw and operate.

  Specifically, the tip side of the planting claw 24 scrapes off the seedlings on the seedling table 17 while drawing an annular movement trajectory X as the rotary case 21 and the planting arm 23 rotate. To plant. The movement trajectory X has a long ring shape in the vertical direction. The front trajectory in the movement trajectory X is an arc-shaped trajectory that rises in a mountain shape on the front side. The rear trajectory in the movement trajectory X is The trajectory extends in the vertical direction.

  The planting claw 24 descends the front part of the movement trajectory X in the switching process from the scraping posture for scraping the seedling from the seedling platform on the upper end side of the movement trajectory X to the planting posture for planting the seedling on the field. The predetermined range in the middle of this time is the descending side storage range R1 in which the planting claws are housed (stored posture), while the planting claws 24 move from the planting posture to the scraping posture. In the switching process, the rear part of the movement trajectory X is lifted and passed, and a predetermined range in the middle is an ascending storage range R2 in which the planting claws 24 are stored (storage posture).

  Further, the planting claw 24 is braked by the brake mechanism in the vicinity of the lowering storage range R1 and the rising storage range R2, and the planting claw 24 is in the scraping posture and before and after the planting posture. The brake is released at the timing when it is located at high speed. Thereby, it is comprised so that the planting work to a farm field may be performed stably.

  The planting portion 18 is intermittently operated with power from the engine 7 by a planting clutch, which will be described later. The planting clutch is attached to both ends of the rotary case 21 when the power is cut off. A regulation mechanism is provided in which the provided planting claw 24 is stopped in the retracted posture. Details will be described later.

Next, the power transmission configuration of the passenger rice transplanter will be described with reference to FIG.
FIG. 4 is a power transmission system diagram of the passenger rice transplanter. The power from the engine 7 is belt-transmitted to the HST 36 that is a hydraulic stepless transmission, and is steplessly shifted and then output to the first transmission shaft 38 in the transmission case 37.

  The power transmitted to the first transmission shaft 38 is transmitted to the travel transmission shaft 41 side (travel system) via the travel side gear 39. The power transmitted to the traveling transmission shaft 41 is transmitted to the pair of left and right front wheels 1 and 1 and the rear wheels 2 and 2 via a traveling transmission 42 that changes gears by changing the meshing of the gears. Drive this rice transplanter.

  Further, the power transmitted to the first transmission shaft 38 is transmitted to the planting transmission shaft 44 side (planting system) via the planting side gear 43 and transmitted to the planting work machine 6 side. The power transmitted to the planting transmission shaft 44 is transmitted to the second planting transmission shaft 47 via the inter-strain transmission mechanism 46 that performs gear change switching by changing the meshing of the gears, and the power is transmitted to the torque limiter. 48 is transmitted.

  The power transmitted to the torque limiter 48 side is transmitted to the planting clutch 52 side via a driven bevel gear 51 that meshes with a main driving bevel gear 49 on the torque limiter 48 side. The motive power transmitted to the planting clutch 52 side for operating the power interruption is transmitted to the take-out shaft 62 protruding from the transmission 37 side when the planting clutch 52 is connected.

  The power transmitted to the take-out shaft 62 is input to a later-described forward / reverse rotation imparting mechanism 53 housed in the gear case 54, and is output to the front-rear output shaft 71 projecting rearward from the gear case 54. The power transmitted to the output shaft 71 is transmitted to the branch shaft 57 via the branch portion 56 made of a bevel gear, and the power transmitted to the branch shaft 57 is supplied to the planting portion 18 provided in a plurality. It is transmitted.

  The planting clutch 52 is configured to perform a switching operation (on / off operation) between a connected state in which power is transmitted via the planting operation lever and a disconnected state in which the power is disconnected. When the planting clutch is connected, the engine power can be transmitted to the planting unit 18 side.

  In addition, the forward / reverse rotation imparting mechanism 53 provided between the planting clutch 52 and the planting part 18 (branch part) further enables the planting clutch 52 to be turned on and off by the planting operation lever. It is configured to be performed reliably. Details of the planting clutch 52 and the forward / reverse rotation imparting mechanism 53 will be described later.

  Next, based on FIG.5 and FIG.6, the structure of the said planting clutch is demonstrated. 5 (A) and 5 (B) are a perspective view and a plan view showing the planting clutch, and FIGS. 6 (A) and 6 (B) are a plan view and a side view showing the engaged state of the planting clutch. 6 (C) and 6 (D) are a plan view and a side view showing the disengagement state of the planting clutch.

  The planting clutch 52 is slidable in the axial direction with a cylindrical transmission 61 formed integrally with the driven bevel gear 51 and rotatably mounted on the take-out shaft so as to rotate integrally with the driven bevel gear 51. A cylindrical switching body 63 that is supported by the take-out shaft 62 and rotates integrally with the take-out shaft 62, and a clutch pawl 61 a that is formed on the mutually opposing end portions of the transmission body 61 and the switch body 63 and meshes with each other. , 63a, and an elastic member 64 made of a coiled compression spring or the like that is externally mounted on the take-out shaft 62 and elastically urges the switching body 63 toward the transmission body.

  When the switching body 63 is slid toward the transmission body 61 by the urging force of the compression spring 64, the pair of clutch claws 61a and 63a are engaged, the planting clutch 52 is connected, and the take-out shaft 62 is transmitted. When the switching body 63 is slid to move away from the transmission body 61 against the elastic force of the compression spring 64 while rotating integrally with the body 61, the pair of clutch claws 61a and 63a are separated from each other and meshed with each other. The planting clutch 52 is disengaged, and the transmission body 61 is in a loose state with respect to the take-out shaft 62.

  By the way, the intermittent operation of the planting clutch 52 is performed on the side of the circular body 66 extending integrally with the clutch pawl 63a side end of the switching body 63 and on the side where the tip side is separated from or close to the transmission body 61. The base end portion is supported on the mission case 37 side so as to be swingable, and the shifter arm 67 is operated by the planting operation lever.

  Specifically, by swinging the shifter arm 67 away from the transmission body 61, the switching body 63 (flange 66) is pressed to the cutting side by the tip of the shifter arm 67 and the planting clutch 52 is disconnected. It is operated (FIGS. 6C and 6D). On the other hand, by oscillating the shifter arm 67 to the side close to the transmission body 61, the pressing of the switching body 63 (flange 66) to the cutting side by the tip of the shifter arm 67 is released, and the elasticity of the compression spring 64 is released. The planting clutch 52 is connected by force (FIGS. 6A and 6B).

  The planting clutch 52 is provided with a regulating mechanism 60 that regulates the cutting operation of the planting clutch 52 when the rotational position (phase) of the flange 66 is outside a predetermined range (cutting range) L. Yes. When the planting claw 24 is located in a range other than the lower side storage range R1 or the upper side storage range R2 of the movement locus X, the regulation mechanism 60 regulates the cutting operation of the planting clutch 52. It is configured.

  Specifically, the restriction mechanism 60 includes a notch 65 cut out at the peripheral edge of the flange 66 of the switching body 63 and a regulation pin (regulator) protruding from the transmission case 37 side to the switching body 63 side. 68. When the restriction pin 68 protruding to the flange 66 side of the switching body 63 is located at a place other than the notch 65 of the flange 66, the transmission body of the switching body 63 is brought into contact with the restriction pin 68 and the flange 66. In the case where the slide movement to the side away from 61 is restricted and the cutting operation of the planting clutch 52 is restricted, while the restriction pin 68 is located at the notch 65 of the flange 66, the flange 66 is notched. The restriction pin 68 is removed through the portion 65, and the cutting operation of the planting clutch 52 is allowed.

  That is, by appropriately adjusting the formation position and the formation range of the notch 65 in the flange 66 of the switching body 63 and setting the cutting range L, the planting claw 24 can move the lowering storage range R1 or the ascent of the movement locus X. In order to restrict the cutting operation of the planting clutch 52 when it is located in a range other than the side storage range R2, the planting claw 24 is moved to the lower side storage range R1 or the upper side storage range when the planting clutch 52 is disconnected. The robot is stopped in a predetermined posture located at R2. As a result, when the planting clutch 52 is disengaged, the planting claw 24 is stopped in a scraped posture or a planting posture, so that it is possible to prevent a situation where non-working traveling such as road traveling is hindered. Can be prevented.

  By the way, when the planting clutch 52 having the above-described configuration is disconnected, the switching body 63 in which the restriction pin 68 is located in the notch 65 is rotated by the remaining driving force, and the restriction pin 68 and the notch 65 are rotated. May be in contact with the end portion side. At this time, especially when the cutting operation of the planting clutch is performed during low-speed rotation driving, the sliding resistance of the contact portion between the restriction pin 68 and the notch 65 becomes high, and the subsequent operation of connecting the planting clutch 52 is hindered. There is a case.

  More specifically, for example, when traveling is stopped at the time of normal planting work and then the planting clutch is disconnected, the flange is cut in a state in which the regulation pin 68 is accommodated in the notch 65 of the flange. 66 may rotate in the forward rotation direction, and the forward rotation side end 65a of the flange 66 may come into contact with the restriction pin 68 (see FIG. 10). Further, when reverse travel is started immediately after cutting operation of the planting clutch 52 or substantially simultaneously, the sliding movement of the switching body 63 is regulated by the regulation pin 68, and after the reverse rotation power is slightly transmitted to the regulation body 63 side, There is a case where the cutting operation of the attached clutch 52 is allowed. In this case, the flange 66 rotates in the reverse rotation direction with the restricting pin 68 accommodated in the notch 65 of the flange 66, and the reverse of the flange 66. The rotation side end portion 65b and the regulation pin 68 may come into contact with each other (see FIG. 12). On the other hand, the forward / reverse rotation imparting mechanism 53 suppresses the sliding resistance generated as described above, and the regulation pin 68 makes a line contact with the flange 66 to reduce the sliding resistance at the time of contact. Hereinafter, details of the forward / reverse rotation imparting mechanism 53 and the regulation pin 68 will be described.

  Next, based on FIG.4 and FIG.7, the structure of the said forward / reverse rotation provision mechanism is demonstrated. FIGS. 7A and 7B are a side view and a cross-sectional view of the main part showing the configuration of the forward / reverse rotation imparting mechanism. The forward / reverse rotation imparting mechanism 53 housed in the gear case 54 reverses the rotational direction immediately before the cutting operation by switching the power transmission path from the first path to the second path when the planting clutch 52 is disconnected. The rotation in the direction can be applied to the planting clutch (switching body) side disposed on the upstream side.

  More specifically, the forward / reverse rotation imparting mechanism 53 is arranged in parallel in the gear case 54 in parallel with the take-out shaft 62, the output shaft 71, and the take-out shaft 52 and the output shaft 71 having the same axis. A bypass shaft 72 serving as a transmission shaft, an input gear 73 pivotally supported on the take-out shaft 62 so as to be relatively rotatable (specifically, freely rotatable) around the axis, and a synchronous rotation (specifically, around the axis) A bypass side gear 74 supported and fixed to the bypass shaft 72 so as to rotate integrally, and a bypass side output supported and fixed to the bypass shaft so as to rotate synchronously (specifically, rotate integrally). A gear 76, an output gear 77 that is a transmission gear that is supported and fixed to the output shaft 71 so as to rotate synchronously (specifically, integrally rotate) around the shaft, and that always meshes with the bypass output gear 76, and switching It rotates together with the take-out shaft 62, which is a shaft, and is moved in the axial direction. A connection sleeve 78 that is externally mounted, a brake cam 79 integrally provided on the outer peripheral side of the detour shaft 72, and an application that imparts a reverse rotation by applying a biasing force to the rotating brake cam 79. (See FIGS. 4 and 7).

  An operating body 87 that slides in the direction of the take-out shaft 62 (output shaft 71) is attached to the outer periphery of the connection sleeve 78 in conjunction with a shifter arm 86 that swings according to the operation of the planting operation lever. The connecting sleeve 78 is slid in the axial direction via the plate-like operating body 87. The connection sleeve 78 is formed with a pawl clutch mechanism 75 for connection to the output shaft 71 side or the output gear 73 side. That is, the connection sleeve 78 and the operating body 87 constitute a path switching unit that switches the transmission path in the gear case 54 to either the first path or the second path.

  Specifically, when the planting clutch 52 is connected by the planting operation lever, the path switching unit connects the connection sleeve 78 to the output shaft 71 side via the operating body 87 interlocked with the shifter arm 86. The pawl clutch mechanism 75 formed between the connection sleeve 78 and the output shaft 71 side is connected by sliding. As a result, the power transmitted to the take-out shaft 62 is switched to the first path side, which is a power path that transmits to the output shaft 71 at a constant speed. At this time, the input gear 73 is idle.

  On the other hand, when the planting clutch 52 is disengaged by the planting operation lever, the connection sleeve 78 is slid to the take-out shaft 62 side via the operating body 87 interlocked with the shifter arm 86. Thus, the connection of the pawl clutch mechanism 75 is released and the input gear 73 is rotated integrally with the take-out shaft 62 so that the power transmitted to the take-out shaft 62 is transmitted from the input gear 73 to the bypass side gear. Connect to. This is a power path for transmitting the power transmitted to the take-out shaft 62 to the output shaft 71 side via the input gear 73 → the bypass side gear 74 → the bypass shaft 72 → the bypass side output gear 76 → the output gear 77. It is switched to the second path side.

  In addition, it is good also as a structure which replaced with the said planting operation lever which performs switching operation of the 1st path | route and 2nd path | route by this path | route switching unit, and provided the operation lever which switches the transmission path | route of a forward / reverse rotation provision mechanism separately.

  The imparting mechanism includes a swing arm 81 that swings around a swing shaft 85 so as to be spaced apart and close to the periphery of a brake cam 79 that rotates integrally with the bypass shaft 72 in the gear case, and the swing mechanism outside the gear case. An operating arm 82 that is swung with the same axis as that of the arm 81 as a swinging shaft 85; a support shaft 83 that is supported by a linear extension along a swinging locus drawn by the tip of the operating arm 82; An elastic member 84 such as a compression spring that urges the operation arm 82 is provided on the side that is externally mounted on the support shaft 83 and that swings the swing arm 82 toward the peripheral side of the brake cam 79. At this time, a contact member 80 serving as a contact portion with the brake cam 79 side is provided on the distal end side of the swing arm 82 urged toward the brake cam 79 side.

  With the above-described configuration, when the planting clutch 52 is disengaged, the forward / reverse rotation imparting mechanism 53 disconnects power transmission from the upstream planting clutch 52 side, and the path switching unit The transmission path in the gear case 54 is switched to the second path, and the applying mechanism bypasses the minute rotational force in the direction opposite to the rotational direction of the remaining driving force by the driving force remaining on the downstream side of the planting clutch 52. It is configured to be applied to the shaft 72 side.

  More specifically, the power transmitted through the second transmission path by the driving force remaining during the disengagement operation of the planting clutch 52 is applied to the bypass shaft 72 side by the swing arm 81 biased to the brake cam 79 side. Is given. In this case, the brake cam 79 is configured so that the swing arm 81 does not exceed the fulcrum of the brake cam 79 when the detour shaft 72 is rotated by the remaining driving force. The bypass shaft 72 can be slightly rotated in the reverse direction by the biasing force toward the cam 79 side.

  Thereby, when the planting clutch 52 is operated to be disconnected, the forward / reverse rotation applying mechanism 53 applies a minute rotational force in the direction opposite to the rotational direction during the planting clutch disconnection operation to the take-out shaft 62 side. Thus, it is possible to prevent the flange 66 (switching body 63) from coming into contact with the restriction pin due to the driving force remaining during the cutting operation of the planting clutch 52, or the flange 66 from coming into strong contact with the restriction pin 68 side.

  Next, the regulating body will be described with reference to FIGS. 8A and 8B are a perspective view and a side view showing the stopper member, and FIGS. 9A and 9B are a bottom view and a front view showing the connected state of the planting clutch. FIGS. 10A and 10B and FIGS. 11A and 11B are a bottom view, a front view, and a perspective view showing a state in which the regulation pin is driven in the forward rotation direction and is in contact with the notch. FIGS. 12A and 12B and FIGS. 13A and 13B are bottom views showing a state in which the regulation pin is driven in the reverse rotation direction and is in contact with the notch portion. They are a front view, a perspective view, and a principal part enlarged view.

  The restriction pin 68 has a base plate formed with a mounting plate 101 having a pair of fixing holes 101a for fixing bolts to the transmission case 37 side, and a distal end side of the restricting pin 68 on a notch end side of the flange 66. A contact portion 102 that contacts 65a and 65b is formed. The abutment portion 102 is formed by a regulation pin 68 so as to cut out a regulation surface 102c that abuts on the flange 66 side when regulating the sliding movement of the switching body 63, and one end side of the regulation surface 102c. The forward rotation contact surface 102a and the reverse rotation contact surface 102b are configured (see FIG. 8).

  The restricting surface 102c is arranged so as to be parallel to the surface of the flange 66 of the switching body 63 that slides, and is in surface contact with the flange 66 when restricting the cutting operation of the planting clutch 52. (See FIG. 9).

  The forward rotation contact surface 102a is an inclined surface that is notched along the axial direction of the regulation pin 68 with respect to the regulation surface 102c. When the switching body 63 rotates to the forward rotation side by the force, it comes into contact with one end (hereinafter referred to as the forward rotation side end portion 65a) side of the notch 65 of the flange 66. At this time, since the forward rotation contact surface 102a is inclined with respect to the forward rotation side end portion 65a of the notch portion 65 in contact with the forward rotation contact surface 102a, the forward rotation contact surface 102a is configured to come into line contact with the corner portion of the forward rotation side end portion 65a. (See FIGS. 10 and 11). A line contact portion A of the forward rotation contact surface 102a is shown in FIG.

  The reverse rotation contact surface 102b is an inclined surface that is notched so as to be inclined with respect to the regulation surface 102c. The reverse clutch is operated by cutting the planting clutch 52 during reverse rotation driving, and the switching body is driven by the remaining driving force. When 63 rotates to the reverse rotation side, it contacts one end of the notch 65 of the flange 66 (hereinafter referred to as the reverse rotation side end 65b). At this time, since the reverse rotation contact surface 102b is inclined with respect to the reverse rotation side end portion 65b of the notch portion 65 that comes into contact, the reverse rotation contact surface 102b is configured to be in line contact B with the corner portion of the reverse rotation side end portion 65b. (See FIGS. 12 and 13). A line contact portion B of the reverse rotation contact surface 102a is shown in FIG.

  According to this configuration, especially when the planting clutch is disengaged from the low speed driving state, such as in the case of reverse rotation driving, the flange side is rotated by the remaining driving force, so that the end side of the notch and the regulating pin are brought into contact with each other. Even when the contact side strongly contacts, the forward (reverse) rotation side end side of the notch and the forward (reverse) rotation contact surface of the restriction pin are in line contact. Therefore, the sliding resistance generated when the notch portion and the regulating pin are in contact with each other is suppressed, and the subsequent planting clutch connection operation (sliding movement of the flange) can be performed smoothly and reliably.

  The contact portion 102 of the restriction pin 68 may be configured to make point contact with the end portion side of the notch portion 65.

6 Planting machine 7 Engine 18 Planting part (planting device)
52 Planting clutch 53 Forward / reverse rotation imparting mechanism 56 Branching portion 65 Notch portion 66 Flange (rotating body)
68 Restriction pin (regulator)

Claims (2)

  A planting device (18) for planting seedlings in a field, a planting clutch (52) for intermittently transmitting power transmitted from the engine (7) to the planting device (18), and the planting clutch A branch portion (56) for branching the power transmitted from (52) to the plurality of planting devices (18), and a notch (65) in the rotating body (66) constituting the planting clutch (52). In the transplanting machine provided with the regulating body (68) for regulating the cutting operation of the planting clutch (52) when it is located outside the range of the notch (65). ) And a transmission upstream side of the branching portion (56), a forward / reverse rotation imparting mechanism (53) is provided, and when the planting clutch (52) is disconnected, the rotating body (66 ) To provide reverse rotation.   The transplanting machine according to claim 1, wherein the planting clutch (52) is configured such that an end side of the notch (65) of the rotating body (66) and the regulating body (68) are in line contact.

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