JP3279870B2 - Extraction claw opening and closing mechanism of temporary planting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of sowing seeds such as flowers and vegetables in a cell-shaped seedling tray, and temporarily planting the cell-shaped seedlings having a size of about 2 to 6 leaves after germination from the cell-shaped seedling tray. The present invention relates to a configuration of a extracting nail for extracting a cell-formed seedling from a pot in a process of temporary planting in a tray.

[0002]

2. Description of the Related Art Seeds such as flowers and vegetables are sown in each pot of a cell-molded seedling tray in which pots are formed in the shape of several rows and several rows of boards, and the seedlings are germinated and have about 2 to 6 leaves after germination. When the size is reached, cell-formed seedlings are completed. Because the cell molded seedlings are too small, they cannot be planted directly with a transplanter,
Further, if cultivated in an alley or a house as it is, there is a possibility of withering. Therefore, conventionally, provisional planting was performed in a temporary planting pot slightly larger than the pot of the cell-formed seedling tray. Extraction nails are used to extract cell-formed seedlings from the pot of the cell-formed seedling tray. The cell-molded seedlings extracted by the extraction nails are temporarily placed in a seedling transfer cup, transported, and transferred to the seedling transfer cup. And temporarily planted in a temporary planting tray.

[0003]

However, there are several types of cell-formed seedling trays for raising cell-formed seedlings, and the size and depth of the pots of the cell-shaped seedling trays vary depending on the type of seeds sown. If the same extraction nail is used when raising a seedling and temporarily planting a cell-formed seedling, an extraction error may occur. In other words, when the cell molded seedlings grow to a size that can be temporarily planted and are extracted from the pot, the extraction nails used when extracting the cell molded seedlings raised in the small pot, or the extraction nails of the width set for the small pot so,
If you try to get out the cell seedlings grown in a large pot, when the extraction nail is pierced into the root pot (the part of the frustoconical soil) of the cell seedlings, if there is a slight misalignment, the seedlings are removed. In some cases, the positioning accuracy must be increased, and the spacing between the extraction claws is so small that the holding amount is too small to withstand the weight of the cell-formed seedlings, and the seedlings may drop during transportation. Conversely, if you try to extract a cell-molded seedling grown in a small pot with a extraction nail set to remove a cell-molded seedling raised in a large pot, insert the extraction nail more than the width of the root pot of the cell-molded seedling. They could break the tray and damage the root mortar itself. In view of this, the present invention seeks to make it possible to adjust the degree of opening of the extraction claw, adjust the degree of opening corresponding to various trays, and reliably remove the tray.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the above problem will be described. That is, in the seedling extraction head of the temporary planting device for extracting the cell-formed seedling from the pot of the cell-formed seedling tray P, the pair of claw holders 96, 96 are provided with extraction claws 5.5, respectively, and the two claw holders 96, 96 are pivotally supported. Axis 97
The cam followers 44, 44 are provided on the respective claw holders 96, 96, and the cam followers 44.4 are provided.
4 by inserting and removing the opening and closing cam rod 4 between them.
・ 5 can be opened and closed and the cam follower 4
A width changing mechanism is provided on at least one of the opening and closing cam rod 4 and the opening and closing cam rod 4, and the opening degree of the tip of the extraction claw 5.5 is adjusted by operating the width changing mechanism.

[0005]

Next, the operation will be described. According to the size of the pot of the cell-formed seedling tray P in which the cell-formed seedlings were raised, the cam followers 44, 44 were switched to adjust the interval between the extraction claws 5, 5, and the seedling extraction head was lowered in this state. Inserting the extraction nails 5.5 into the pot of the seedling tray P, closing the extraction nails 5.5, and then raising the seedling extraction head allows the cell-shaped seedlings to be extracted. By adjusting the interval between the extraction claws in accordance with the size of the root pot of the cell-formed seedling, the cell-formed seedling can be reliably extracted.

[0006]

Next, an embodiment will be described. 1 is an overall front view of the temporary planting apparatus of the present invention, FIG. 2 is an overall plan view of the temporary planting apparatus, FIG. 3 is a left side view of the temporary planting apparatus, FIG. 4 is a right side view thereof, and FIG. Right side view of the front-back elevation mechanism,
6 is a plan view of the same, FIG. 7 is a side sectional view of the temporary placing cup on the transport chain, FIG. 8 is a side sectional view of the extracting head, FIG. 9 is a rear view of the opening / closing cam rod portion of the extracting head, and FIG. FIG. 11 is an enlarged front cross-sectional view of the claw holder.

Referring to FIG. 1, FIG. 2, FIG. 3, and FIG. 4, the overall configuration of the automatic temporary planting apparatus will be described. At the lower part, a frame base H on which caster wheels for movement are arranged is provided. On the frame base H, a seedling tray conveyor 10 and a temporary planting tray conveyor 11 are arranged on the left and right in parallel in the front-rear direction. At a substantially central portion between the temporary planting tray conveyor 11 and the seedling tray conveyor 10, a seedling transfer / transportation device C that crosses the conveyors at right angles to each other is provided. Pillars H1 and H2 are erected before and after between the temporary planting tray conveyor 11 and the seedling tray conveyor 10, and the seedling extraction unit E is disposed on the right side of the frame H3 provided between the upper ends of the pillars H1 and H2. The planting part B and the perforated part D are arranged on the left side. A washing tank 12 is provided on the lower right side of the seedling transfer and transfer device C.
Is disposed, and a collection container 49 and a drive motor M are disposed on the lower left side.

Next, a specific configuration will be described. The seedling transfer / transportation device C arranges the temporary placing cups 9 around the chain (or belt) 20 at regular intervals.
As shown in FIG. 1, driven sprockets 36 are arranged on both upper sides of the seedling tray conveyor 10 and the temporary planting tray conveyor 11 on the frame base H, a driving sprocket 35 is arranged on a lower left side, and a tension is provided on a lower right side. The chain 20 is wound around the sprocket 34 so as to be substantially rectangular when viewed from the front. Accordingly, the seedling transfer / transportation device C is arranged vertically and pivots in the left-right direction across both conveyors of the temporary planting tray conveyor 11 and the seedling tray conveyor 10. The seedling tray conveyor 10 and the temporary planting tray conveyor 11 are arranged in parallel so that the inside of the wound chain 20 penetrates, the seedling extracting section E is arranged on the pre-process side of the seedling tray conveyor 10, and the planting section B is moved to the temporary planting tray. The seedling tray conveyor 10 and the temporary planting tray conveyor 11 are arranged on the rear side of the conveyor 11 so that the seedlings on the tray do not pass through the lower part of the seedling transfer and transfer device C.
It is configured so as to be as close as possible to the upper surface, and to have a low center of gravity with a reduced height.

The tension sprocket 34 is rotatably supported by an arm 40, and a spring 41 is locked at the tip of the arm 40.
The release lever 42 is connected to the rotation base of the arm 40, and by rotating the release lever 42, the tension sprocket 34 is rotated upward to move the inside of the cleaning tank 12. In the set state in which the release lever 42 is rotated in the tension direction, the cup 9 on the chain 20 is soaked in the chemical solution in the cleaning tank 12. This chemical mainly contains a disinfectant.

On the outer periphery of the chain 20, two rows of large and small temporary storage cups 9 are fixed at equal intervals. As shown in FIG. 7, the temporary placing cup 9 has a wedge-shaped insertion hole into which a cell-formed seedling is inserted, and a hole having a different size and a different depth so as to match the size of the cell-formed seedling. Kinds of cups 9a and 9b are provided. Then, the height of the upper surface is matched before and after, and this adjusts the position of the sensor for detecting poorly growing seedlings to the position of the upper surface, so that the dead zone of the detection sensor does not occur depending on the size of the seedlings I have.

The lower portion of the temporary placing cup 9 has a leg 9e.
The lower surface at the center of the leg portion 9e is fixed to the chain 20, and the lower surface on both sides is slid on a guide body 45 fixed to the frame base H to be conveyed. The upper portion of a side cover 46 fixed to the side surface of the guide body 45 is inserted into the upper concave portion on both sides of the leg portion 9e to cover the leg portion 9e, and soil and dust enter the sliding portion and are conveyed. The parts are not damaged and the sliding resistance is not increased.
In this embodiment, two types of cups are provided, but three or more types of cups can be provided in parallel.

A seedling extracting portion E is provided between the seedling transfer and transfer device C and the cell-formed seedling tray P, which is simultaneously moved back and forth and up and down. And a planting section B is provided between the seedling transfer / transportation device C and the temporary planting tray S, where the planting section B is simultaneously moved back and forth and up and down. The cell-formed seedlings in the cup 9 are grasped and planted in the pot of the temporary planting tray S.

Since the raising and lowering mechanism for simultaneously moving the heads of the seedling extracting unit E and the planting unit B in the forward and backward and up and down directions is substantially the same, the raising and lowering mechanism of the seedling extracting unit E will be described in detail. As shown in FIGS. 5 and 6, a frame H3 above the pillars H1 and H2 is provided.
A support H4 is erected in the center between the support H4 and the frame H3, and a seedling collecting roller guide 15 is arranged in a front-rear direction and in an arc shape in a side view, on a side surface between the support H4 and the frame H3. A guide rail 23 is disposed in the front and rear direction on the side surface of the lower frame H3, and a slider 55 that slides in the front and rear and up and down directions is fitted to the guide rail 23. And a guide rail 56 provided in the vertical direction.

A mounting plate 57 is fixedly mounted on the seedling collecting support 22, and a roller 59 is rotatably supported on a rear surface of an upper end of the mounting plate 57 via a mounting boss 58. The guide 15 is fitted to the rail 15a. A curved portion 15b is provided at the upper end of the roller guide 15, and the curved portion 15b is provided with two rows of cups 9a and 9b in which the temporary placing cups 9 have different depths and their upper surfaces are aligned. The tip of the extraction claw 5 for extracting the cell-formed seedling is the cup 9a.9.
In order to be able to be inserted into the predetermined position of b, it can be lifted obliquely upward. That is, the difference L1 between the depths of the cups 9a and 9b in FIG.
The distance L1 between the cup 9a and the cup 9b is set by changing the position of the stopper 60.

The stopper 60 is, as shown in FIGS. 5 and 6, a front surface (a left side surface in FIG. 5) of the seedling collecting support 22.
The stopper 60 is provided with a shock absorber therein so as to absorb a shock at the time of contact. The front side of the stopper 60 is fixed to a sliding body 61, and the sliding body 61 is fixed to the frame H3.
Is guided slidably back and forth along a guide 62 fixed to the frame H3, and a cylinder 63 fixed to the frame H3.
Is fixed to the tip of the piston rod. By expanding and contracting the cylinder 63, the stop position of the seedling collecting support 22 can be set, and can be selected according to the cell-formed seedling.

That is, in the position where the cylinder 63 is extended as shown in FIG. 5, the seedling removing support 22 is stopped on the lower side, and the extraction claw 5 can be inserted to a deep position, and the cell forming having a deep and large pot is performed. The cell-formed seedling G can be taken out from the seedling tray P and temporarily placed in a deep and large cup 9a as shown in FIG. In the position where the cylinder 63 is reduced, the extension of the slide cylinder 16 causes
The roller 59 is moved to the curved portion 15b along the rail portion 15a and stopped, and the extraction claw 5 can be inserted to a shallow position, and picks up the cell-formed seedling G from the cell-formed seedling tray P having a shallow and small pot. 7, it can be temporarily placed in a shallow and small cup 9b. The extension and contraction position of the cylinder 63 is determined by the sensor 64a.
64b.

A mounting plate 65 is fixedly provided in the middle of the rear portion of the seedling collecting support 22.
The tip of the piston rod 16a of the slide cylinder 16 is connected to the slide cylinder 16. The slide cylinder 16 is pivotally supported by a bracket 67 in which the upper portion of the cylinder is fixed to a column H2, and a sensor 69a for detecting the extension position of the cylinder is provided.
・ 69b is provided. The mounting plate 6
5 is provided with an abutment portion 65a at the upper end, while a stopper 66 with a shock absorber is provided at the front of the bracket 67 so that when the slide cylinder 16 is reduced, the abutment bracket 65a contacts the stopper 66. To reduce the shock at the time of stopping and prevent the grasped seedlings from falling. By expanding and contracting the slide cylinder 16, the seedling collecting support 22 moves along the seedling collecting roller guide 15, the guide rails 23 and 56, and the seedling extracting portion E moves up and down and back and forth simultaneously,
The upper part of the seedling transfer carrier C and the upper part of the cell seedling tray P can be reciprocated.

The mechanism for raising and lowering the planting support 21 on the planting section B side is also substantially the same. As shown in FIG. 3, the planting support 21 is connected to the slide cylinder 17, and The slide cylinder 17 is pivotally supported by a bracket fixed to the column H3, and a stopper is also arranged in the same manner as described above. By expanding and contracting the slide cylinder 17, the seedling collecting roller guide 25 and the planting along the guide rail 24 are performed. The support 21 is moved so that the planting section B moves up and down and back and forth at the same time, so that the seedling transfer and transfer device C and the temporary planting tray S can reciprocate. In this way, both the seedling extraction part E and the planting part B are simultaneously moved in the front-rear direction and the up-down direction by one cylinder, respectively, and the movement time is reduced with a simple configuration.

Next, the structure of the seedling picking head of the seedling extracting unit E will be described with reference to FIGS. The seedling pick-up portion is moved to the upper stop position of the cell-formed seedling tray P and the upper stop position of the seedling transfer and transfer device C by expansion and contraction of the slide cylinder 16, and is fixed to the seedling picking support 22 at each position. It is lowered by the lifting guide cylinder 27. A plurality of seedlings provided with a pantograph-type pitch changing mechanism 75 at the lower end of the piston rod and the guide rod of the cylinder 27 with the elevating guide, wherein the pitch changing mechanism 75 is provided with a sampling claw or the like of the present invention so as to change the left and right pitch. .. Are provided.

As shown in FIG. 4 and FIG. 8, the structure of the seedling extraction body F is such that a pitch changing mechanism 75 fixes an elevating guide 74 whose interval is changed, and a fixing claw 3 is fixed to the front surface of the elevating guide 74. The opening / closing cam rod 4 and the opening / closing mechanism support rod 7 are inserted into the elevating guide 74 so as to be slidable in the vertical direction in parallel. The upper end of the opening / closing cam rod 4 is pivotally supported by the lower end of the pawl opening / closing cylinder 31, and the upper end of the opening / closing mechanism support rod 7 is pivotally supported by the lower end of the pawl projecting cylinder 30. The fixed claw 3 is vertically inserted into and supported by a concave portion (pot) of the cell-formed seedling tray P in which the cell-formed seedling is inserted, and the extraction claws 5.5 are connected to the claw support rod 7 via an opening / closing mechanism J. It is disposed so as to be inserted at a predetermined angle from obliquely above.

In the present embodiment, cell-shaped seedlings of the two sizes, large and small, can be temporarily planted, so that the extraction claws 5, 5 can be reliably extracted according to the size.
The opening degree can be adjusted by the opening / closing mechanism J. That is, in the opening / closing mechanism J, as shown in FIGS. 8 to 11, a support 94 is fixed to the lower end of the opening / closing mechanism support rod 7 with a screw 95, and a pivot shaft 97 is suspended in the center of the support 94. Front and rear claw holders 96F formed in a U-shape on the pivot shaft 97.
The upper end of the 96R is pivotally supported, and the pivot shaft 97 is a pivot point for the claw holders 96F and 96R. Claw holder 9
The front and rear surfaces of the 6F / 96R are covered by side covers 100/100, and the side covers 100/100 are formed in a T-shape, and the lower protruding portions thereof are restricted portions 100a / 10.
0a, the lower end surfaces of the claw holders 96F and 96R are in contact with each other to restrict downward rotation.

The upper surfaces of the claw holders 96F, 96R are urged downward by compression springs 98, 98 inserted into the support 94. On the other hand, the nail holder 96F
The upper ends of the extraction claws 5 are fixed to the lower portion of the 96R, and the camshafts 999 are inserted in the front and rear horizontal direction at the side portions thereof. Grooves 99a and 99b are provided in the middle of the cam shaft 99 in the circumferential direction.
Inside the ball 10 urged by the spring 102
1 is inserted, and the ball 101 fits into the groove to form a detent mechanism.

A roller-shaped cam follower 44 is rotatably supported at the end of the camshaft 99. The cam follower 44 is integrally formed with rollers 44a and 44b having different diameters in the front and rear directions, and one of the rollers 44a and 44b is
Contacted. That is, the claw holders 96F and 96R are disposed in front and back, and the respective claw holders 96F and 96R are provided with the extraction claw 5.5 and the camshafts 99 and 99, respectively, and the diameter on the camshafts 99 and 99 is small. The rollers 44a of the cam follower 44 are opened and closed by the cam rod 4.
When the rollers are in contact with both sides of the opening / closing cam rod 4, the spacing between the extraction claws 5.5 is small and open, and the rollers 44b are used to extract small cell-formed seedlings. When they come into contact with each other, the intervals between the extraction claws 5 are largely open, and are used for extracting large cell-formed seedlings.

In this switching, the position of the cam follower 44 is changed by pushing and pulling the camshafts 99, 99, and is maintained at that position by the ball 101 being fitted into the grooves 99a, 99b by the detent mechanism. . However, the size of the cam follower 44 can be set to three or more types of rollers so as to correspond to three or more types of cell-formed seedling trays. It is also possible to configure so that the opening degree of the extraction claw is changed by rotating the shaft around the axis so that the angle differs depending on the angle.
Further, the cam follower 44 is not limited to a roller, but may be configured to slide and change the width of the contact portion.

When the claw opening / closing cylinder 31 is reduced, the opening / closing cam rod 4 is raised, so that there is no support between the cam followers 44 and the claw holder 96F.
96R rotates about the pivot shafts 97, 97, and the extraction claws 5.5 are closed. At this time, the nail holder 96F ・ 9
The lower inner side surface of the 6R is in contact with the regulating portions 100a, 100a so as not to close more than a certain width.

With such a configuration, when the cell-formed seedlings are temporarily placed from the cell-formed seedling tray P to the seedling transfer / transportation device C, the pitch changing mechanism 75 causes each seedling extract F ·
F ... is adjusted to the pitch of the pot of the cell-formed seedling tray P, and the cylinder 27 with the elevating guide is extended at the stop position above the cell-formed seedling tray P to insert the fixed claw 3 into the pot. Is extended to insert the extraction claw 5 into the pot. Then, the extraction claw 5 is closed by reducing the claw opening / closing cylinder 31, the pot portion of the cell-formed seedling is sandwiched, and the cylinder 27 with the elevating guide is lifted by reducing it. And the slide cylinder 1
6 is moved to the upper stop position of the seedling transfer / transportation device C. At this time, each of the seedling extraction bodies is adjusted to the pitch of the temporary placing cup 9 by the pitch changing mechanism 75, and the cylinder 27 with the elevating guide is extended. The seedling transfer / transportation device C is inserted into the temporary placing cup 9 and the claw opening / closing cylinder 31 is extended to open the extraction claw 5.
Are lifted by reducing the size of the seedlings, and the cell-formed seedlings are placed in the temporary placing cup 9. Note that the seedling holding device (not shown) does not lift the seedling when lifting.

Next, the structure of the planting head portion and the perforated portion of the planting portion B will be described in brief with reference to FIGS. A slide frame 37 and a guide rail 13 are fixed to the planting support 21, and a pantograph mechanism 32 similar to the seedling extraction unit E is provided on the slide frame 37. The pitch is changed by the pantograph mechanism 32, and the same number of lifting cylinders 33, 33,... As the pots of the temporary planting tray S are vertically provided, and the opening and closing bodies 50, 50,.
Are provided, and planting chucks 6, 6,... Are provided below the opening / closing bodies 50, 50, respectively. The opening / closing body 50 is constituted by an air cylinder, and supplies air to the opening / closing body 50. By doing so, the planting chuck 6 can be opened and closed.
However, the lifting / lowering cylinder 33 can expand and contract independently, so that when a missing plant or a dwarf seedling is conveyed, the cell-forming seedling of the temporary placing cup 9 where the missing plant or the dwarf seedling is located is detected. To do that.

A support frame 26 projects forwardly from the middle of the column H2. A guide rail 14 is provided on the support frame 26 in a horizontal direction. The sliding support 1
The upper end of 8 is fitted to the guide rail 13 slidably up and down. An upper and lower cylinder 47 is vertically fixed to the sliding support member 18, and the same number of holes as the row of temporary planting pots of the temporary planting tray S are arranged at the tip of the piston rod of the vertical cylinder 47. are doing. Therefore, in accordance with the transportation of the temporary planting tray conveyor 11, it moves forward and backward simultaneously with the planting section B, moves the drilling rod 8 up and down by expansion and contraction of the vertical cylinder 47, and before planting by the planting section B, A hole of the size of the root pot of the cell-formed seedling is formed in the planting pot. The perforated rod 8 is configured to be replaceable according to the size of the root pot of the cell-formed seedling.

Accordingly, the planting portion B is positioned directly above the temporary placing cup 9, the planting claws 6 are opened and lowered, and the cell-formed seedlings are caught. The molded seedling is removed from the temporary placing cup 9, the slide cylinder 17 is reduced and lowered, and the planting nail 6 is moved to the temporary planting tray S.
Move up and plant cell shaped seedlings in pots. At this time, it is detected by a sensor (not shown) attached to the seedling transfer / carrying device C whether or not the leaves of the cell-formed seedling placed on the temporary placing cup 9 are growing normally. Only when the leaves of the cell-formed seedlings are growing normally,
6 are moved independently to the seedling catching position, and only normal cell-formed seedlings are taken out of the temporary storage cup 9 by the above-described operation. From the first cell-formed seedling conveyed to the plant is made to be caught by all the plantlets B and planted in the pot. The abnormal cell-formed seedling is dropped into a collection container 49 provided below the left end of the seedling transfer / transportation device C.

The empty temporary storage cup 9 after the transfer of the seedlings is cleaned below and on the side of the transport. That is, as shown in FIG. 1 to FIG.
The mounting bracket 80 is provided with a nozzle 81 for blowing air to blow off soil and dust attached to the empty cup, and abnormal cell-formed seedlings that have not been planted are forcibly forced into the collection container 49. It is made to fall out.
Also, the mounting bracket 8 is located on the side of the right frame base H.
Nozzle 83 that protrudes 2 and blows out air is attached,
The cup after being immersed in the washing tank 12 and washed is dried by the air discharged from the nozzle 83. The drive motor M, sensors, electromagnetic valves for supplying air to the cylinder, and the like are connected to and controlled by a controller.

[0031]

As described above, the present invention has the following advantages. That is, the opening degree of the extraction nail can be adjusted according to the size of the pot of the cell molded seedling tray, and the extraction nail can be reliably inserted into the root pot portion of the cell molded seedling. It does not hurt. In addition, since the extraction claw opening can be adjusted to the size of the root pot of the cell-formed seedling, the cell-formed seedling can be reliably pinched, the mistake at the time of extraction can be reduced, and the extraction accuracy can be improved. .

[Brief description of the drawings]

FIG. 1 is an overall front view of a temporary planting device of the present invention.

FIG. 2 is an overall plan view of the temporary planting device.

FIG. 3 is a left side view of the temporary planting device.

FIG. 4 is a right side view of the same.

FIG. 5 is a right side view of the front and rear elevating mechanism of the seedling extracting unit E.

FIG. 6 is a plan view of the same.

FIG. 7 is a side sectional view of the temporary placing cup on the transport chain.

FIG. 8 is a side sectional view of the extraction head.

FIG. 9 is a rear view of the opening / closing cam rod portion of the extraction head.

FIG. 10 is a front view of the extraction claw portion of the extraction head.

FIG. 11 is an enlarged front sectional view of the claw holder.

[Explanation of symbols]

 E Seedling extraction part P Cell molded seedling tray 4 Opening / closing cam rod 5 Extraction claw 44 Cam follower 96 Claw holder 97 Pivot shaft

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hisaya Yamada 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka Inside Yanmar Agricultural Machinery Co., Ltd. Hei 4-100315 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01G 9/08 610 A01C 11/02

Claims (1)

(57) [Claims] 1. In a seedling extraction head of a temporary planting device for extracting cell-formed seedlings from a pot of a cell-formed seedling tray P, a pair of claw holders 96, 96 are provided with extraction claws 5, 5, respectively. Are pivotally supported by a pivot shaft 97, cam followers 44 are provided in the respective claw holders 96, and the opening and closing cam rods 4 are inserted and removed between the cam followers 44. 5 can be opened and closed, and the cam followers 44
Alternatively, a width changing mechanism is provided on at least one of the opening and closing cam rods 4, and the opening degree of the tip of the extraction claws 5 is adjusted by operating the width changing mechanism.