JP6401563B2 - Nursery box stacking device - Google Patents

Description

  The present invention provides a nursery box stacking apparatus that stacks the seedling boxes and easily transports them to the next step after performing various operations such as sowing, irrigation, and soil covering on the seedling boxes placed in the floor soil. More particularly, the present invention relates to a seedling box stacking device that sequentially stacks the seedling boxes so as to lift upward.

  Conventionally, the present applicant has developed a seedling box stacking device that sequentially stacks seedling boxes that are sequentially transported by a transporting device (see Patent Document 1).

  The seedling box stacking device is arranged at the rear end side of various working devices such as a seeding device, a irrigation device, a soil covering device, and a soil finishing device arranged along the conveying device, and each operation is interrupted by the discharge operation of the seedling box. Therefore, the seedling boxes that are continuously sown can be stacked, and the work efficiency can be improved.

  The seedling box stacking device is provided with a leaf spring member at the end portion and a limit switch. When the seedling box is transported to the end portion, the leaf spring member alleviates the impact when the seedling box is stopped. Then, it comes into contact with the limit switch and operates the solenoid to start the rotation of the lifting mechanism.

Japanese Patent No. 5425493

  Recently, it has been required to increase the efficiency and speed of each work such as sowing to seedling boxes and covering soil, and the speed of the seedling boxes carried into the stacking device by the transport device tends to increase. While a series of operations of the seedling box can be performed continuously such as floor soil, irrigation, sowing, covering soil, etc., the stacking operation of the seedling box is an intermittent operation, so that the seedling box is transported in the stacking device. The speed needs to be increased at a higher speed than other operations, and in the series of operations of the seedling box, the conveying speed of the stacking device is important for speeding up and increasing efficiency.

  The seedling box stacking device has a plate spring member that is long in the vertical direction, the center portion is curved toward the upstream side in the transport direction, the upper end portion is rotatably supported, and the lower end is supported to be movable in the vertical direction. The impact of the nursery box is smoothly absorbed by a relatively long stroke. However, at the same time, it is necessary for the nursery box to start the rotation of the lifting mechanism via the solenoid by operating the limit switch, and the smooth shock absorption by the leaf spring and the timing of raising the nursery box by the limit switch are high. It was troublesome to adjust so as to achieve both accuracy.

  In addition, placing electrical components such as limit switches and solenoids in a seedling box stacking device that absorbs and stops the impact of the seedling box may cause soil, mud, moisture, etc. to be applied to the electrical components from the seedling box. In addition, there is a risk that it may hinder the improvement of the reliability and durability of the seedling box stacking apparatus, and the maintenance is troublesome.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a nursery box stacking apparatus that solves the above-described problems by using a mechanical automatic one-rotation clutch for driving a lifting function.

The present invention includes a conveying member (16) for conveying the nursery box (19) from the carry-in part toward the terminal part (E),
A lifting mechanism (27, 30, 31) for lifting a predetermined amount of the seedling box transported to the terminal end (E);
A clutch actuating member (23) disposed at the terminal end (E) and moving in contact with the nursery box (19);
An automatic single-rotation clutch (50) interposed between the drive source (35) and the lifting mechanism (27), connected in conjunction with the movement of the clutch actuating member (23), and released in a single-rotation state. ) And
The automatic one-rotation clutch (50) includes a ratchet (51) interlocked with the drive source (35, 43), a rotation plate (52) interlocked with the lifting mechanism (27), and the rotation plate is rotatable. A claw body (53) supported by the clutch, a stopper member (60) movable to a position in contact with the claw body and a position away from the claw body in conjunction with the clutch operating member (23), and the stopper A spring (63) for biasing the member (60) to a position in contact with the claw body (53),
By moving the stopper member (60) in conjunction with the rotation of the clutch operating member (23), the claw body (53) in the non-engagement position is engaged with the ratchet (51) and the The rotary plate (52) is rotated integrally with a ratchet, and the clutch actuating member (23) and the stopper member (60) as the seedling box (19) is lifted by the lifting mechanism (27, 30, 31). Is restored by the urging force of the spring (63), and the claw body (53) comes into contact with the stopper member (60) in a state in which the rotating plate (52) makes one rotation, and is engaged with the ratchet (51). Union,
In the nursery box stacking device (7) characterized in that.

  The spring (63) urges the stopper member (60) to a position where it abuts on the claw body (53), and an impact when the seedling box (19) collides with the clutch operating member (23). To absorb.

  Spring load changing means (59b, 61, 62) (80, 80a) capable of changing the load of the spring (63) (63 ') is provided.

The stopper member is a stopper bar (60) supported by a plurality of support plates (59a, 59b) so as to be movable in parallel with the conveying direction of the seedling box (19),
The spring (63) is disposed so as to be surrounded by the stopper bar (60), one end side of the ratchet side being axially immovable to the stopper bar and the other end side being in contact with the support plate (59b),
The spring load changing means fixes (61) the support plate (59b) on the other end side in contact with the spring (63) so that its position can be changed in the moving direction of the stopper bar (60).

The stopper member is a stopper bar (60) supported movably in parallel with the conveying direction of the seedling box,
An adjustment plate (80) having a plurality of engagement holes (80a ...) is integrally fixed to the stopper bar,
One end of the spring (63 ′) is locked to the fixing member (82), and the other end of the spring is selectively locked to any one of the plurality of engagement holes (80a). It comprises spring load changing means.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on the structure as described in a claim by this.

  According to the first aspect of the present invention, the lifting mechanism is automatically connected by the clutch actuating member that moves in contact with the nursery box being conveyed, and the automatic one-rotation clutch that rotates once and disconnects is interposed. In addition, it is possible to maintain the timing of the transfer to the terminal end of the nursery box and the lifting mechanism with high accuracy, and electrical components such as a limit switch and a solenoid are not required, so that reliability and durability can be improved and maintenance is facilitated.

  Further, the automatic one-rotation clutch has a simple structure including a ratchet, a rotating body, a claw body, a stopper member, and a spring. The stopper member biased by the spring serves as a trigger for starting one rotation and stops one rotation. It is possible to maintain a reliable operation stably over a long period of time.

The spring moves the stopper member against the urging force to start rotation of the automatic one-rotation clutch, and the nursery box abuts on the clutch operating member to absorb the impact of the nursery box, so that the leaf spring member No special shock absorbing member is required, the structure is simplified, the driving mechanism of the lifting mechanism is started by the connection of the automatic one-rotation clutch, and the smooth stop by the shock absorption at the time of transfer to the end of the nursery box Timing can be maintained over a long period of time with high accuracy.

The scan pulling changing means, it is possible to easily adjust the spring load, by adjusting the change in the spring load due to aging or the like of the spring, it is possible to hold the stop smooth nursery box.

According to the second aspect of the present invention, since the other end side support plate that supports the stopper bar is in contact with the spring and is fixed so that the position can be changed, the spring load can be easily and reliably adjusted with a simple structure. Even by adjusting the spring load, the contact position of the stopper bar with the claw body is always kept constant, and the driving start and stop timings of the lifting mechanism can be stably maintained.

According to the third aspect of the present invention, the other end of the spring whose one end is locked to the fixing member is simply connected to the stopper bar with the adjustment plate having a plurality of engagement holes. By selectively locking to any one of the plurality of engagement holes, the spring load can be easily adjusted, and the spring load can be adjusted to contact the claw body of the stopper bar. The position is always kept constant, and the driving start and stop timings of the lifting mechanism can be stably maintained.

The side view which shows the whole series of working machines (seeding machine) to a seedling box. The perspective view which shows a seedling box stacking apparatus. The perspective view which shows the state by which the seedling box was conveyed. The perspective view which shows the state by which the seedling box was stacked. The side view which shows a seedling box stacking apparatus. The top view of a nursery box stacking apparatus. The front view which carried out the cross section of the seedling box stacking apparatus partially. The front view which shows the raising of the nursery box. The front view which shows the further raise of a nursery box. The side view which shows the action | operation of a seedling box stacking apparatus. The side view which shows the state which operation | movement advanced. The side view which shows the state which advanced further. The side view which shows the state which advanced further. The side view which shows the automatic 1 rotation clutch of a seedling box stacking apparatus. The side view which shows the action | operation of an automatic 1 rotation clutch. The side view which shows the operation | movement. The side view which shows the state which advanced further. The side view which shows the state which advanced further. The side view which shows the state which advanced further. The side view which shows the state which adjusted the spring load. The plan view. The side view which shows the automatic 1 rotation clutch which changed partially.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a seeding machine H that continuously performs a series of operations on a seedling box. In FIG. 1, a seeding device 2 and a irrigation device are sequentially transferred from the upstream side to a continuous conveying system 1 in a straight line. 3, an earthing (covering) device 4, a soil finishing device 5 for leveling the soil flat, a cornering device 6 for leveling the soil inside the edge of the seedling box, and a seedling box stacking device 7 are arranged.

  The seedling box stacking device 7 has two parallel frames 13 and 13 supported by legs 12 with adjusters 11 as shown in FIGS. 2 to 6, and is supported across the left and right frames 13. Conveying rubber rollers (conveying members) 16 are fixed to a plurality of shafts 15. A plurality of seedling box guides 17 are fixed along the left and right frames 13. A roller 20 for a conveyor belt 18 (see FIGS. 3 and 4) is supported via a mounting arm 14 on the upstream side of the frame 13 on the upstream side of the nursery box stacking device 7, and a guide roller 24 is rotatable. It is supported by. Thus, the seedling box is sowed and leveled by each of the devices 2, 3, 4, 5, 6 while being transported by the transport belt 18, and is then transported and transported to the stacking device 7 by the transport rubber roller 16. At this time, the conveyance rubber roller 16 rotates at an increased speed with respect to the conveyance speed of the conveyance belt 18 and conveys the seedling box 19 at a high speed.

  The left and right frames 13 are provided with restricting plates 21 and 21 for regulating the upstream front end face of the seedling box with an interval h (see FIG. 5) that can pass through the seedling box 19 by the bracket. Further, a rear end regulating plate 22 is fixed to the downstream end portion E in the transport direction of the stacking device 7. In front of the rear end restricting plate 22 at the end portion E, clutch operating arms 23, 23 made of plates that rise upward are disposed. The clutch operating arm 23 has an automatic one-rotation clutch 50 as described later. It is interlocked with the stopper (trigger) bar 60 to be started and is biased forward by a spring 63 (see FIGS. 14 to 19). In the figure, reference numeral 28 denotes an auxiliary plate for preventing mud adhesion provided at the terminal end E. Adjacent to the front end restricting plate 21 and the rear end restricting plate 22 of the left and right frames 13, respectively, stacked plates (side restricting plates) 25 are erected, and the seedling box 19 has its front end at the front end restricting plate 21, 21, the left and right ends thereof are restricted by four stacked plates 25, and the rear ends are restricted by the rear end restricting plates 22, 22 and stacked. Further, a mounting plate 32 is erected on one frame 13 so that the height can be adjusted in the vertical direction, and a switch 33 for detecting the upper limit of the stacked seedling boxes is installed at the upper end portion of the plate 32. Yes.

  As shown in detail in FIGS. 5 to 7, two shafts (axes) 27 and 27 are rotatably supported on the left and right frames 13 in the nursery box stacking portion. Arms 30 and 30 having a support shaft 29 are fixed, and stacked rollers 31 and 31 are rotatably supported on the left and right ends of the support shaft 29. One frame 13 is provided with a motor (drive source) 35, and an output shaft of the motor projects outside the frame 13, and large and small sprockets 36 and 37 are fixed. Sprockets 39 are fixed to the support shaft 15 of the conveying rubber roller 16, a chain 40 is wound between the sprocket 39 and the large sprocket 36, and the sprockets 39, 39 on the rear end side are They are connected by a chain 40. A sprocket 43 is supported on the shaft 27 of the front stacking roller 31, and a chain 45 is wound between the sprocket 43 and the small sprocket 37. In the figure, 47 is a transmission cover that covers a transmission device such as a chain, and 49 is a motor case.

  Between the sprocket 43 and the shaft 27, an automatic one-rotation clutch 50, which is a main part of the present invention, is interposed. As shown in detail in FIGS. 5 and 14, the automatic one-rotation clutch 50 includes a ratchet 51 connected to the sprocket 43 constituting the input side and a rotary plate connected to the shaft 27 constituting the output side. 52. A claw body 53 is rotatably supported on the rotary plate 52 by a pivot pin 53a. A spring 55 is stretched between the claw body 53 and a pin 55a implanted in the rotary plate, The claw 53 b of the claw body 53 is biased so as to engage with the ratchet 51. Further, the rotary plate 52 is provided with a clutch release pin 56, and a protruding portion 53 c that protrudes on the opposite side of the claw 53 b can abut on the pin 56 with respect to the pivot pin 53 a of the claw body 53. .

  On the other hand, as shown in detail in FIGS. 6, 7, and 14, an auxiliary frame 58 is fixed to one frame 13 so as to protrude outward, and a bracket 59 as a support member is attached to the auxiliary frame 58. The stopper (trigger) bar 60 is supported by the bracket 59 so as to be slidable in the front-rear direction (direction parallel to the feeding direction of the seedling box). One end (front end) side of the stopper bar 60 extends so as to face the protruding portion 53c of the claw body 53, and is a chamfered portion 60a that contacts the protruding portion 53c. The other end (rear end) of the stopper bar 60 is connected to an arm 54 that rotates integrally with the clutch operating arm 23 via a pin. The bracket 59 includes two support plates 59a and 59b that support the stopper bar 60. One support plate 59a is integrally fixed to the auxiliary frame 58 with a bolt or the like, and the other support plate 59b is a screw nut. 61 and the slide pin 62 are fixed to a long hole formed in the auxiliary frame 58 so that the position can be adjusted in the front-rear direction (moving direction of the stopper bar). A spring 63 is disposed between the two support plates 59 a and 59 b so as to surround the stopper bar 60, and a stopper washer 65 is provided in front of the stopper bar 60 on one support plate 59 a side of the stopper bar 60. The spring 63 is contracted between the washer 65 and the other support plate 59b, and the stopper bar 60 has a chamfered portion 60a in contact with the protruding portion 53c of the claw body 53. It is energized towards.

  The clutch operating arm 23 is fixed to a shaft 67 that is rotatably supported across both the frames 13. Therefore, when the clutch operating arm 23 rotates in contact with the nursery box, the stopper bar 60 is spring-loaded. The chamfered portion 60a moves away from the protruding portion 53c of the nail body 53.

  As shown in FIG. 7, the shaft 27 on the front end side extends across the left and right frames 13 and 13, and the one end thereof is integrally connected to the rotating plate 52 of the automatic one-rotation clutch 50 as described above. Yes. The shaft 27 is connected to the shaft 27 of the terminal side stacking roller 31 through the counter gear 70, the sprocket 71 and the chain 72 outside the other frame 13. Accordingly, the shafts 27 and 27 on the start end side and the end end side rotate in the reverse direction at the same timing, and the stacking rollers 31 are rotated in parallel around the shaft 27 via the arms 30 and 30. The front and rear shafts 27, the arms 30, and the stacking rollers 31 constitute a lifting mechanism that lifts the seedling box by a predetermined amount. Note that reference numeral 88 in FIG. 7 denotes a cover on the other frame 13 side.

  Each of the (four) stacked plates 25 has a linear holding piece 77... That is pivotally supported with its lower end 77 a as a fulcrum. And a support portion 77c extending outward from the upper end of the inclined surface, and a stopper 77d where the tip of the support portion 77c is bent. The holding piece 77 is in contact with a torsion spring 79 urging so as to protrude inward of the plate 25 at the lower end pivotally supporting portion, and the stopper 77d is in contact with the outer surface of the plate 25, The inward protruding position is restricted. The stacking plate 25 and the holding piece 77 constitute a holding member that holds the raised seedling box 19 in the lifting position.

  Next, the operation of the present seedling box stacking device 7 based on the above-described configuration will be described. In the home position where the seedling box 19 is not in contact with the clutch operating arm 23, as shown in FIGS. 2, 5, and 14, the stopper bar 60 is urged by the spring 63 and the stopper washer 65 is moved forward. (Fixed) The position is in contact with the support plate 59a. In this state, the clutch operating arm 23 is in a state of being rotated forward, and the tip chamfered portion 60 a of the stopper bar 60 is in contact with the protruding portion 53 c of the claw body 53. The claw body 53 is rotated against the spring 55 so that the protruding portion 53c is in contact with the clutch release pin 56. Therefore, the claw body 53 is automatically moved when the claw 53b is detached from the ratchet 51. The one-rotation clutch 50 is in a disconnected state.

  Then, the seedling box 19 sown and leveled through each device 2, 3, 4, 5, 6 is carried into the main stacking device 7 by the transport belt 18. Then, the speed is increased by the conveying rubber rollers 16 and guided by the seedling box guides 17 and 17 and conveyed toward the terminal end E. As shown in FIGS. 3, 10, and 15, the seedling box 19 contacts the clutch operating arm 23 and rotates the arm 23 rearward before contacting the rear end regulating plate 22. The rotation of the clutch operating arm 23 moves the stopper (trigger) bar 60 backward against the spring 63 via the shaft 67 and the arm 54. As a result, the chamfered portion 60 a at the tip of the stopper bar is removed from contact with the protruding portion 53 c of the claw body 53, and the claw body 53 is rotated by the urging force of the spring 55 to engage the claw 53 b with the ratchet 51. To do. In this state, the rotation of the motor 35 is transmitted to the ratchet 51 via the small sprocket 37, the chain 45 and the sprocket 43, and the claw body 53 is engaged with the ratchet 51 via the claw body 53. It is transmitted to the rotating plate 52. That is, when the stopper bar 60 acting as a trigger disengages the claw body 53, the automatic one-rotation clutch 50 is connected.

  As a result, the rotation of the rotating plate 52 rotates the arm 30 on one side (forward) via the shaft 27, and the other (rear) side via the gear 70, the sprocket 71, the chain 72 and the shaft 27. The arm 30 is rotated, and both the stacking rollers 31 and 31 are rotated upward to lift the seedling box 19.

  As a result, the seedling box 19 is transferred from the conveying rubber roller 16 to the stacking roller 31, and as shown in FIGS. 11, 12, and 13, the seedling box 19 is moved to each stacking plate as the stacking roller 31 rotates. It is guided by the (side regulating plate) 25 and lifted further upward. At this time, as shown in FIGS. 8, 9, and 7, each holding piece 77... Rotates outwardly against the spring 79 when the seedling box 19 comes into contact with the inclined portion 77b. In the vicinity of the upper end rotation of the stacking roller 31, the stopper 77 d returns to the normal regulation position in contact with the plate 25 in accordance with the spring 79, whereby the seedling box 19 is held in the raised position. The Even if the shaft 27 further rotates and each stacking roller 31 descends past the upper end position, the seedling box 19 is held in the lifted position by the support portion 77c of the holding piece 77, and only each stacking roller 31 is moved. Descend.

  As shown in FIGS. 10 and 15, when the seedling box 19 abuts on the clutch operating arm 23 and rotates the operating arm 23, the stopper bar 60 compresses and deforms the spring 63 as described above. The automatic one-rotation clutch 50 is switched to the connection. At this time, even if the seedling box 19 is transported at a relatively high speed, its kinetic energy is absorbed by the compression deformation of the spring 63, and the seedling box 19 is smoothly held in a state in which the soil is properly held without being offset. Stop. The clutch operating arm 23 is held in a rotating state as shown in FIGS. 10, 11, 15 and 16 while it is in contact with the seedling box 19 even if the seedling box is lifted. As shown in FIGS. 12 and 17, when the seedling box 19 is lifted by a predetermined amount, the clutch operating arm 23 is released from contact with the seedling box 19, and is restored to the original position (home position) by the restoring force of the spring 63. ).

  In this state, the stopper bar 60 is also returned to the original front position (home position) where the stopper washer 65 is in contact with the front (fixed) support plate 59a. In this state, in the automatic one-rotation clutch 50, as shown in FIGS. 12, 13, 18 and 19, the ratchet 51 and the rotating plate 52 are integrated by the engagement of the pawl 53 with the ratchet 51. The rotation continues and the stacking roller 31 further rotates. When the automatic one-rotation clutch 50 approaches the one-rotation position, as shown in FIGS. 5 and 14, the protruding portion 53 c of the claw body 53 comes into contact with the chamfered portion 60 a of the stopper bar 60 at the front position. . In this state, when the ratchet 51 and the rotating plate 52 are slightly rotated, the claw body 53 is rotated against the spring 55 around the pivot pin 53a so that the engagement between the claw 53b and the ratchet 51 is achieved. At the same time, the projection 53c comes into contact with the clutch release pin 56 and becomes the home position. In this state, the automatic one-rotation clutch 50 is in a released state in which the ratchet 51 and the rotating plate 52 are separated from each other, and stops driving the lifting mechanism including the stacking arm 30 and the roller 31. As shown in FIG. 4, the seedling boxes 19 sequentially carried in are sequentially stacked from the lower stage by the stacking device 7, and the upper limit switch 33 is repeated until the uppermost nursery box 19 is detected.

  The elastic force of the spring 63 that absorbs the impact force when the nursery box 19 is stopped can be adjusted as shown in FIGS. For example, when the urging force of the spring 63 is weakened by many years of use, or when the spring force of the spring 63 is increased by changing the nursery box 19 or changing the conveying speed, the screw nut 61 is loosened to support the movable side. The plate 59b is adjusted and positioned with respect to the auxiliary frame 58 so as to approach the fixed side support plate 59a. As a result, the spring 63 is held in a state of being further compressed between the fixed side support plate 59a and the movable side support plate 59b. The rear end side support plate (movable side support plate 59b) that contacts the spring 63 and the screw nut 61 serve as spring load changing means.

  Therefore, in this state, the seedling box 19 abuts on the clutch operating arm 23 to rotate the arm 23, and the stopper bar 60 is moved backward while the spring 63 in the high compression state is compressed and deformed by the stopper washer 65. Moving. Thereby, the kinetic energy of the seedling box 19 can be absorbed with a stronger force. In addition, by adjusting the movable side support plate 59b in the direction away from the fixed side support plate 59a, the impact of the seedling box can be absorbed with a weaker force. The operating stroke and timing of the automatic one-rotation clutch 50 by the stopper bar 60 are not changed by adjusting the spring load.

  FIG. 22 shows another embodiment of changing / adjusting the spring load. Only the changed part of the spring load will be described, and the other parts will be denoted by the same reference numerals and description thereof will be omitted. In the spring adjustment device (spring load changing means) according to the present embodiment, the adjustment plate 80 is integrally fixed to the rear end side of the stopper bar 60, and the adjustment plate 80 is connected to the arm 54 via the connection pin 81. To do. A large number of holes 80a are formed in the adjustment plate 80 in the front-rear direction, and the other end of the spring 63 ′ having one end hooked to a bracket (fixing member) 82 provided in the frame 13 is the above-described one. One of the many holes 80a is selectively hooked. Note that both the front support plate 59a and the rear support plate 59b of the bracket 59 are integrally fixed to the auxiliary frame 58 with bolts.

  When the nursery box abuts on the clutch operating arm 23 and rotates the arm backward, the integral adjustment plate 80 and the stopper bar 60 are moved backward via the shaft 67 and the arm 54. As a result, the tip of the stopper bar 60 is disengaged from the protrusion 53c of the claw body 53, the automatic one-rotation clutch 50 is switched to the connection, and the spring 63 'is extended to absorb the collision energy of the seedling box. In order to change / adjust the spring force of the spring 63 ′, the hooking position of the other end of the spring 63 ′ is changed to one of the many holes 80 a of the adjustment plate 80. Even when the spring load is adjusted, the stopper washer 65 abuts the front support plate 59a, so that the abutting position of the stopper bar 60 with the claw body 53 is always kept constant, and the drive of the lifting mechanism is started. The stop timing can be stably maintained.

  Although the stopper bar (stopper member) 60 is movable in the front-rear direction, it may be movable in the rotational direction.

7 Nursery Box Stacking Device 16 Conveying Member 19 Nursery Box 23 Clutch Actuating Member (Arm)
27, 30, 31 Lifting mechanism (shaft, arm, stacking roller)
35 Drive source (motor)
50 Automatic 1-rotation clutch 51 Ratchet 52 Rotating plate 53 Claw body 53b Claw 53c Projecting portion 56 Clutch release pin 60 Stopper member (stopper bar)
63, 63 'Spring 59 Support member (bracket)
59a Ratchet side (fixed side) support plate 59b Other end side (movable side) support plate 59b, 61, 62 Spring load changing means (movable side support plate, screw nut, slide pin)
80, 80a Spring load changing means (adjustment plate, multiple holes)
E Termination

Claims (3)

A transport member for transporting the nursery box from the carry-in part toward the terminal part,
A lifting mechanism that lifts the seedling box conveyed to the end portion by a predetermined amount;
A clutch actuating member disposed at the end portion and moving in contact with the nursery box;
An automatic one-rotation clutch interposed between a drive source and the lifting mechanism, connected in conjunction with the movement of the clutch operating member, and released in a state of one rotation;
The automatic one-rotation clutch includes a ratchet that is linked to the drive source, a rotary plate that is linked to the lifting mechanism, a claw that is rotatably supported by the rotary plate, and a clutch operating member that is linked to the clutch operating member. A stopper member movable to a position contacting the claw body and a position separating from the claw body, and a spring urging the stopper member to a position contacting the claw body,
By moving the stopper member in conjunction with the rotation of the clutch actuating member, the claw body in the non-engagement position is engaged with the ratchet, and the rotating plate is rotated integrally with the ratchet, As the seedling box is lifted by the lifting mechanism, the clutch actuating member and the stopper member are returned by the urging force of the spring, and the claw body comes into contact with the stopper member with the rotating plate rotating once. Ri name to release the engagement of the ratchet,
The spring urges the stopper member to a position where it comes into contact with the claw body, and absorbs an impact when the seedling box collides with the clutch operating member,
Comprising spring load changing means capable of changing the load of the spring;
A nursery box stacking device characterized by that. The stopper member is a stopper bar supported by a plurality of support plates so as to be movable in parallel with the conveyance direction of the seedling box,
The spring is disposed so as to surround the stopper bar, one end side of the ratchet side being axially immovable to the stopper bar and the other end side being in contact with the support plate,
The spring load changing means is configured to fix the support plate on the other end side in contact with the spring so that the position thereof can be changed in the moving direction of the stopper bar.
The nursery box stacking device according to claim 1 . The stopper member is a stopper bar supported so as to be movable in parallel with the feeding direction of the seedling box,
An adjustment plate having a plurality of engagement holes is integrally fixed to the stopper bar,
One end of the spring is locked to the fixing member, and the other end of the spring is selectively locked to any one of the plurality of engagement holes to constitute the spring load changing means.
The nursery box stacking device according to claim 1 .

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