JP2012051681A - Turntable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable which has a simple structure and is reduced in height.SOLUTION: The turntable includes: a movable unit 8 rotating a conveyance object 51 placed thereon; and a fixed unit 3 supporting the movable unit 8. An upper rail member 9 is provided on a lower portion of the movable unit 8, a lower rail member 5 is provided on an upper portion of the fixed unit 3. The upper rail member 9 is disposed on the lower rail member 5 via a plurality of members 7. Each of the upper rail member 9 and the lower rail member 5 is constituted by making a linear member having a circular or substantially circular sectional profile into an annular shape. The member 7 has a drum-like shape having a curved surface laid along the sectional profile of the upper rail member 9 and the lower rail member 5.

Description

  The present invention relates to a turntable that is arranged at a branching portion of a conveyor device and changes a conveyance direction of an object to be conveyed.

  In a conventional turntable, for example, as disclosed in Patent Document 1, a thrust bearing is disposed between a fixed base and a movable base, and the fixed base and the movable base are fixed by a shaft that penetrates the thrust bearing. Yes. That is, when the movable table is rotationally driven around the axis by some rotational drive means, the movable table can rotate with the rotational frictional resistance reduced by the thrust bearing.

JP 2002-167087 A

  By the way, in the conventional turntable, since the fixed base and the movable base are connected by a shaft member and the movable base can be rotated with respect to the fixed base, the dimension in the height direction inevitably increases. Further, the conventional turntable has to use a special member such as a thrust bearing, and the assembling work is complicated, and it is difficult to reduce the cost.

  Accordingly, an object of the present invention is to provide a turntable that has a simple configuration and can reduce the height dimension.

  The invention of claim 1 for solving the above-mentioned problem is a turntable that is arranged at a branching portion of a conveyor device and changes the conveyance direction of the object to be conveyed, wherein the turntable places the object to be conveyed. A movable part that can rotate and a fixed part that supports the movable part. The movable part is provided with an upper rail member, and the fixed part is provided with a lower rail member. The upper rail member is disposed on the lower rail member via a plurality of interposition members, and the upper rail member and the lower rail member are formed by annularly forming a linear member, The member is a turntable characterized by having a drum shape.

According to the first aspect of the present invention, there is provided a movable part on which the object to be conveyed can be rotated and a fixed part that supports the movable part, and the movable part is rotated with respect to the fixed part to The direction can be changed to the transport direction.
In that case, an upper rail member is provided in a movable part, a lower rail member is provided in a fixed part, and an upper rail member is arrange | positioned via a some interposition member on a lower rail member. As a result, the movable portion is disposed on the fixed portion via the lower rail member, the interposed member, and the upper rail member.
Since the interposition member has a drum shape, the interposition member can be stably disposed on the lower rail member, and further, the upper rail member can be stably disposed on the interposition member. As a result, the annular upper rail member can be easily arranged concentrically above the annular lower rail member. That is, the center of the annular lower rail member and the center of the annular upper rail member can be easily matched. Here, the “drum shape” means a shape in which both ends have a large diameter and a small-diameter portion is present in the central portion.
Furthermore, since the upper rail member and the lower rail member are each configured by forming a linear member in an annular shape, the interposed member is movable in an annular shape while rolling along the upper rail member and the lower rail member. The annular upper rail member can change the rotational position while rolling the interposition member relative to the annular lower rail member.
Therefore, the movable part provided with the upper rail member can change the rotation position smoothly with respect to the fixed part provided with the lower rail member.

  The invention according to claim 2 is the turntable according to claim 1, wherein the upper rail member and the lower rail member are formed by annularly forming a linear member having a circular or substantially circular cross section. It is.

  In the invention of claim 2, since the upper rail member and the lower rail member are formed by annularly forming a linear member having a circular cross section or a substantially circular cross section, the drum-shaped interposition member serves as the lower rail member. It is easy to engage so as to straddle, and the upper rail member is easy to fit into the interposition member.

  A third aspect of the present invention is the turntable according to the first or second aspect, wherein an interval holding member is provided to keep the interval between the interposition members constant.

  In the invention of claim 3, since the interval holding member that keeps the interval between the interposition members constant is provided, the interval between the interposition members does not change. Therefore, the load on the movable part side is stably transmitted to the fixed part side.

  A fourth aspect of the present invention is the turntable according to any one of the first to third aspects, wherein the plurality of interposed members are arranged at equal intervals.

  In the invention of claim 4, since the plurality of interposition members are arranged at equal intervals, the weight of the object to be conveyed placed on the movable portion is evenly lowered from the upper rail member via the plurality of interposition members. It is transmitted to the rail member (fixed part side). As a result, the weight of the conveyed object can be stably supported by the lower rail member (fixed portion).

  A fifth aspect of the present invention is the turntable according to any one of the first to fourth aspects, wherein the linear member is a steel pipe or a round bar steel.

  In the invention of claim 5, since the linear member is a steel pipe or a round steel bar, it is not necessary to form a circular cross-sectional outline of the linear member. And an upper rail member and a lower rail member can be formed only by comprising steel pipe or round bar steel annularly.

  In the invention of claim 6, an annular or arc-shaped rack is provided concentrically with the upper rail member and the lower rail member in either one of the fixed portion and the movable portion, and the other of the fixed portion and the movable portion is provided. 6. The turntable according to claim 1, further comprising a pinion that engages with the rack, and driving means that drives the pinion.

  In the invention of claim 6, an annular or arc-shaped rack is provided concentrically with the upper rail member and the lower rail member in one of the fixed portion and the movable portion, and the other of the fixed portion and the movable portion is provided on the other side. Since the pinion that engages with the rack is provided, when the pinion rotates, the engagement position of the pinion with respect to the rack changes. That is, the rotational position of the movable part with respect to the fixed part changes. And since the drive means which drives a pinion was provided, the rotation position of a movable part can be changed with a drive means. That is, by driving the pinion with the driving means, the engagement position of the pinion with respect to the rack can be changed, and the rotational position of the movable part with respect to the fixed part can be changed.

  A seventh aspect of the present invention is the turntable according to any one of the first to sixth aspects, wherein the movable portion is provided with a conveying means for conveying the object to be conveyed.

  In the seventh aspect of the invention, since the movable part is provided with a conveying means for conveying the object to be conveyed, the object to be conveyed is placed on the movable part by the conveying means, or the object to be conveyed is discharged from the movable part. can do.

The turntable of the present invention can be configured very simply by arranging an upper rail member, a lower rail member, and an interposition member between the fixed portion and the movable portion. In the upper rail member and the lower rail member, linear members are formed in an annular shape, and the interposed member has a drum shape. Therefore, the interposition member can be stably engaged with the upper rail member and the lower rail member, and the annular upper rail member can be easily arranged concentrically with respect to the annular lower rail member.
And the rotation position of the movable part provided with the upper rail member with respect to the fixed part provided with the lower rail member can be changed smoothly while rolling the drum-shaped interposition member. As a result, the direction of the conveyed object placed on the movable part can be changed smoothly.
Moreover, since the turntable of the present invention is configured by arranging the upper rail member, the lower rail member, and the interposition member between the fixed portion and the movable portion, the dimension in the height direction is extremely reduced, The floor of the turntable can be lowered. As a result, the apparatus can be reduced in size.
In addition, a large-diameter turntable can be easily manufactured.
Furthermore, the structure of the turntable of the present invention is very simple, and it is possible to reduce the weight of the turntable and to reduce the assembly cost and the manufacturing cost.

It is a perspective view of the turntable of this invention. It is a disassembled perspective view of the turntable of FIG. It is the perspective view which looked at the fixing | fixed part of the turntable of FIG. 1 from upper direction. In FIG. 3, it is a perspective view which shows the state which has arrange | positioned the several drum-shaped roller on the cyclic | annular lower rail member at equal intervals. It is a perspective view which shows the state which mounted the upper rail member on the several drum-shaped roller in FIG. It is the perspective view which looked at the movable part of the turntable of FIG. 1 from the downward direction. It is a disassembled perspective view of a lower rail member, a drum-shaped roller, and an upper rail member. It is a partial expansion exploded perspective view of a fixed part and a movable part. It is the elements on larger scale of the connection part of a movable part and a fixed part. It is an AA arrow line view of FIG. It is a partial expansion perspective view of the fixing | fixed part of a rack. FIG. 12 is a partially enlarged perspective view of a fixing portion of a rack different from the rack illustrated in FIG. 11. It is a perspective view which shows the state which has arrange | positioned the lower rail member different from FIG. 3, and a drum-shaped roller to the fixing | fixed part. It is a BB arrow line view of FIG. It is a perspective view which shows the state which has arrange | positioned the turntable of FIG. 1 to the conveyor apparatus. It is a perspective view which shows the modification of the drive mechanism of the movable part with respect to a fixed part. FIG. 17 is a perspective view showing another modification example different from FIG. 16.

Hereinafter, the structure of the turntable 1 which implemented this invention is demonstrated, referring drawings.
As shown in FIG. 1, the turntable 1 includes a fixed portion 3, a movable portion 8, and a roller conveyor 2 (conveying means) in order from the bottom. Hereinafter, it demonstrates in order.

  The fixed part 3 constitutes the lower part of the turntable 1 and supports the weight of the movable part 8 and the roller conveyor 2. As shown in FIGS. 2 and 3, the fixing portion 3 includes a base 4, a lower rail member 5, and a rack 6.

  The base 4 is a flat member. A lower rail member 5 and a rack 6 are disposed on the upper surface side of the base 4 and are fixed as described later. The lower rail member 5 is a linear member having a circular cross section, and for example, a steel pipe or a round bar steel can be adopted. Further, the lower rail member 5 is curved and has an annular (circular) structure.

  The base 4 is provided with a plurality of pairs of holes 4a (only one pair is shown in FIG. 3) in an annular shape. The hole 4 a is a hole for fixing the fixing member 24 to the base 4. As shown in FIG. 8, the fixing member 24 has two sides 24a and 24b orthogonal to each other. The fixing member 24 has a shape in which two flat members (sides 24a and 24b) such as angle steel are orthogonal to each other. One side 24 a of the fixing member 24 contacts the base 4. In addition, two holes 26a are provided in the side 24a. The two holes 26 a on the side 24 a correspond to the pair of holes 4 a of the base 4. That is, the two holes 26a and the pair of holes 4a can be matched. Then, as shown in FIG. 9, the bolts 25a are passed through the holes 26a and 4a, which are matched with each other, and nuts 25b are screwed into the bolts 25a that have passed therethrough. As a result, the fixing member 24 is fixed to the base 4.

  Further, a curved notch 27 (FIG. 8) is provided on the other side 24 b (side standing on the base 4) of the fixing member 24. The notch 27 has a shape along the contour of the lower rail member 5.

  A plurality of fixing members 24 having such a structure are arranged at positions corresponding to a plurality of pairs of holes 4a provided in the base 4, and are further fixed by bolts 25a and nuts 25b. As a result, the plurality of fixing members 24 are arranged in a circle on the base 4 and fixed.

  Then, the lower rail member 5 is disposed on the plurality of fixing members 24. That is, as a result of the plurality of fixing members 24 being arranged in a circle on the base 4, the notches 27 (FIG. 8) of the sides 24 b of the fixing members 24 are arranged in a circle, and the notches 27 of the individual fixing members 24 are formed in the notches 27. The lower rail member 5 can be fitted. The movement of the lower rail member 5 fitted into the notches 27 of the plurality of fixing members 24 is restricted by the fixing member 24.

  A plurality of drum-shaped rollers 7 (intervening members) are arranged on the lower rail member 5 arranged on the base 4 as shown in FIG. The drum-shaped roller 7 has a large diameter at both ends, and has a small-diameter recessed portion 7b at the center. Further, as shown in FIG. 8, a pin 7 a is provided through the rotation center of the hourglass roller 7. Further, the pins 7a of the plurality of drum-shaped rollers 7 pass through holes 48a and 48b of elongated plate-like retainers 38a and 38b (interval holding members). That is, the pin 7a is rotatably supported by the holes 48a and 48b. Therefore, as shown in FIG. 7, the space | interval of each drum-shaped roller 7 is fixed.

  The recessed portion 7 b that contacts the lower rail member 5 in the drum-shaped roller 7 has a curved surface that follows the contour of the cross section of the lower rail member 5. Alternatively, the drum-shaped roller 7 is in contact with the lower rail member 5 at two or more points in the recessed portion 7b. Therefore, the drum-shaped roller 7 can move smoothly while rolling along the lower rail member 5. The drum-shaped roller 7 is formed of a resin such as cast nylon.

  Further, the drum-shaped roller can be brought into linear contact with the lower rail member and the upper rail member. That is, when a flange portion is provided at both ends of the drum-shaped roller, a portion between both flange portions is formed in a cylindrical shape, and a portion where the drum-shaped roller contacts the lower rail member and the upper rail member is flat, the lower rail member And the upper rail member is in linear contact with the drum-shaped roller. Further, the flange portions at both ends of the drum-shaped roller exhibit a guide function, and the drum-shaped roller does not come off from the lower rail member and the upper rail member.

  The lower rail member 5 and the upper rail member 9 are annular, but are not necessarily continuous. That is, it is sufficient that the lower rail member 5 and the upper rail member 9 are continuous as long as the individual drum-shaped rollers 7 roll.

Next, the rack 6 will be described.
As shown in FIG. 11, an uneven tooth surface 36 is formed on the upper surface of the rack 6. Further, the side surface 6b of the rack 6 is provided with holes 6c penetrating the rack 6 at predetermined intervals. Further, as shown in FIG. 3, the rack 6 is curved with a smaller radius than the lower rail member 5. The length (center angle) of the rack 6 is selected according to the form of the conveyor device 50 described later. For example, the lower rail member 5 may be formed in a ring shape, but may be formed in a sector shape having a predetermined central angle. The rack 6 is fixed on the base 4 by a plurality of fixing members 29. That is, the rack 6 is disposed on the base 4 concentrically with the lower rail member 5, and is fixed to the base 4 by the fixing member 29.

  The fixing member 29 has two sides 29a and 29b orthogonal to each other, and one side 29b of the fixing member 29 comes into contact with the base 4 and is fixed by a bolt 30a and a nut 30b. The fixing member 29 is composed of two orthogonal plate members (sides 29a and 29b) such as angle steel. That is, a hole 31b through which the bolt 30a is passed is provided in one side 29b, and a hole (not shown) for passing the bolt 30 is also provided in the base 4.

  In addition, a hole 31 a is provided in the other standing side 29 a of the fixing member 29. The fixing members 29 are disposed on both sides of the rack 6. The rack 6 is interposed via the fixing member 29 by causing the holes 31a of the two fixing members 29 and the holes 6c provided in the side wall 6b of the rack 6 to coincide with each other, penetrating the bolts 32a and screwing the nuts 32b. It is fixed to the base 4. As a result, the rack 6 is firmly fixed to the base 4.

Next, the movable part 8 will be described.
As shown in FIGS. 2 and 6, the movable portion 8 includes a mounting table 10 (upper plate), an upper rail member 9, and a motor built-in roller 11 (driving means). The mounting table 10 is a member configured in a flat plate shape that fixes a roller conveyor 2 described later on the upper surface side.

  Further, the upper rail member 9 has the same configuration as the lower rail member 5 described above. The upper rail member 9 is fixed to the lower surface 10 a of the mounting table 10 with the same structure as the structure in which the lower rail member 5 is fixed to the base 4. That is, the upper rail member 9 is fixed to the lower surface 10 a of the mounting table 10 by the plurality of fixing members 33.

  Furthermore, a motor built-in roller 11 (driving means) is installed on the mounting table 10 of the movable portion 8. That is, a plate-like mounting member 34 is fixed to the lower surface 10 a of the mounting table 10 by bolts and nuts 37, and the motor built-in roller 11 is fixed to the mounting member 34. Although not shown, the motor built-in roller 11 has a motor and a speed reducer built therein. And the pinion 35 is being fixed to the roller part of the outer periphery. Therefore, when the motor built-in roller 11 is driven, the pinion 35 is rotationally driven.

  The movable part 8 is disposed above the fixed part 3. That is, the upper rail member 9 is disposed on the drum-shaped roller 7 disposed on the lower rail member 5 on the fixed portion 3 side. The profile of the cross section of the upper rail member 9 is along a curved surface formed in the drum-shaped roller 7. Therefore, the position of the upper rail member 9 is not shifted in the horizontal direction by the plurality of drum-shaped rollers 7 arranged on the circumference of the lower rail member 5.

  That is, the drum-shaped roller 7 has a shape in which the central portion has a small diameter and increases in diameter toward the both ends, and the central portion has a constricted portion 7b. The upper end portion of the lower rail member 5 and the lower end portion of the upper rail member 9 are in contact with the recessed portion 7b of the drum-shaped roller 7. The drum-shaped roller 7 stably spans the lower rail member 5, and the upper rail member 9 is placed on the drum-shaped roller 7. At that time, the pinion 35 meshes with the tooth surface 36 of the rack 6.

  Instead of the rack 6 shown in FIG. 11, a rack 40 shown in FIG. 12 may be used. The rack 40 includes two parallel side walls 42 (side plates) and a plurality of engagement pieces 41 that connect the side walls. The engaging pieces 41 are arranged at a predetermined interval so as to be engageable with the pinion 35. Further, the side walls 42 are provided with holes 43 at predetermined pitches. The holes 43 are provided on both side walls 42, and the bolts 32 a can pass through the two opposed holes 43. The rack 6 is disposed on the base 4 in such a posture that the side wall 42 and the engagement piece 41 stand up with respect to the base 4, and is fixed to the base 4 via the fixing member 29.

Finally, the roller conveyor 2 will be described.
As shown in FIG. 1, the roller conveyor 2 is integrally fixed to the mounting table 10 of the movable unit 8. The roller conveyor 2 includes a frame member 15, a driving roller 12, and a plurality (five in the example shown in FIG. 1) driven rollers 13. The driving roller 12 and the plurality of driven rollers 13 are rotatably supported on the side surfaces 15 a and 15 b of the frame member 15.

  The driving roller 12 and the plurality of driven rollers 13 are connected by a belt 14 so that power can be transmitted. As the driving roller 12, for example, a well-known motor built-in roller can be adopted. And the drive roller 12 can switch a rotation direction by the control apparatus which is not shown in figure.

  A stopper 16 is provided at one end A of the frame member 15. The stopper 16 is a protruding portion that provides a wall surface that rises in parallel with the driving roller 12 and the driven roller 13. Further, the other end B of the frame member 15 functions as an entrance / exit of the object to be conveyed. In other words, the other end B is a part where the object to be conveyed can be received on the roller conveyor 2 and the object to be conveyed on the roller conveyor 2 can be discharged from the roller conveyor 2.

  The frame member 15 is fixed on the plate-like mounting table 10 of the movable part 8. That is, the roller conveyor 2 is fixed on the mounting table 10. As shown in FIG. 1, an auxiliary roller unit 19 is disposed on the mounting table 10 with a space in parallel with the frame member 15. The auxiliary roller unit 19 has a plurality of first auxiliary rollers 18 provided on a frame having a U-shaped cross section. A flange portion 28 is provided at the end of the first auxiliary roller 18 on the side opposite to the frame member 15.

  A second auxiliary roller 20 is disposed between the frame 19 a of the auxiliary roller unit 19 and the side surface 15 a of the frame member 15. The rotation axis of the second auxiliary roller 20 is rotatably supported by the side wall 19a of the frame body and the side surface 15a of the frame member 15.

  The auxiliary roller unit 19 and the second auxiliary roller 20 described above are disposed on both sides of the frame member 15. The heights of the driving roller 12, the driven roller 13, the first auxiliary roller 18, and the second auxiliary roller 20 are the same, but only the height of the flange portion 28 of the first auxiliary roller 18 protrudes.

  The object to be conveyed that is conveyed on the roller conveyor 2 is usually arranged in the frame member 15. However, when the width of the conveyed object is larger than the width of the frame member 15, the conveyed object is supported not only by the driving roller 12 and the driven roller 13 but also by the first auxiliary roller 18 and the second auxiliary roller 20. The Then, the object to be conveyed is prevented from moving outward from the roller conveyor 2 by the flange portion 28 of the first auxiliary roller 18.

  Further, when the object to be conveyed is sent from the other end B of the roller conveyor 2, the object to be conveyed advances on the roller conveyor 2, and eventually collides with the stopper 16 and stops. When the roller conveyor 2 (drive roller 12) is driven in the reverse direction, the conveyed object on the roller conveyor 2 leaves the stopper 16 and leaves the turntable 1 from the other end side B.

  The size of the turntable 1 configured as described above is such that the length of one side in the vertical and horizontal directions is about 1 m, and the total height including the roller conveyor 2 is about 20 cm. The height of only the fixed part 3 and the movable part 8 is about 10 cm.

Next, the operation of the turntable 1 will be described.
The turntable 1 configured as described above is employed in a conveyor device 50 as shown in FIG. That is, the conveyor device 50 includes the first conveyor 21, the second conveyor 22, the third conveyor 23, and the turntable 1. The turntable 1 is disposed at the center (branch portion) of the three conveyors.

  The first conveyor 21 and the second conveyor 22 are arranged on the same straight line, and the turntable 1 is arranged between them. In addition, a third conveyor 23 is disposed adjacent to the turntable 1 in a direction orthogonal to the first conveyor 21 and the second conveyor 22.

  Assuming that the first conveyor 21 is on the upstream side in the transport direction, the transported object 51 is sent from the first conveyor 21 to the turntable 1. At that time, the movable portion 8 of the turntable 1 has the other end B shown in FIG. 1 facing the first conveyor 21 side.

  The package of the object to be transported 51 is provided with information (barcode or the like) related to the transport destination, and this information is acquired by the sensor 52 installed on the first conveyor 21, and a detection signal is transmitted to a control device (not shown). Is done. The control device identifies whether the transport destination of the transported object 51 is the second conveyor 22 side or the third conveyor 23 side. And if the to-be-conveyed object 51 is mounted on the turntable 1, the motor built-in roller 11 (FIG. 6) provided in the movable part 8 of the turntable 1 will be driven.

  Assuming that the transport destination is on the second conveyor 22 side, the roller 11 with a built-in motor is a pinion until the other end B of the roller conveyor 2 of the turntable 1 faces from the first conveyor 21 side to the second conveyor 22 side. 35 is rotated. At that time, the drive roller 12 is stopped. Therefore, the conveyed object 51 does not fall from the turntable 1 while the movable part 8 is rotating. If the transport destination is on the third conveyor 23 side, the motor built-in roller 11 rotates the pinion 35 until the other end side B faces the third conveyor 23 side.

  When the other end B of the turntable 1 faces the direction of the conveyor corresponding to the transport destination of the transported object 51, the rotation direction of the drive roller 12 is switched to the reverse direction by a control device (not shown). As a result, the conveyed object 51 on the turntable 1 (roller conveyor 2) moves from the turntable 1 to the second conveyor 22 or the third conveyor 23.

  As another pattern, if the upstream in the transport direction is the third conveyor 23 side, the other end B of the roller conveyor 2 of the turntable 1 is initially arranged on the third conveyor 23 side. And the conveyance destination information of the to-be-conveyed object 51 is read by the sensor 53 provided in the 3rd conveyor 23, and is transmitted to the control apparatus which is not shown in figure. The control device switches the rotation direction of the motor built-in roller 11 (FIG. 6) according to the transport destination information, and rotates the roller conveyor 2 (movable unit 8) of the turntable 1.

  Assuming that the transport destination is the first conveyor 21 side, a control device (not shown) drives the motor built-in roller 11 so that the other end side B faces the first conveyor 21 side from the third conveyor 23 side. Conversely, if the transport destination is the second conveyor 22 side, the motor built-in roller 11 is driven so that the other end B faces the second conveyor 22 side from the third conveyor 23 side.

  When the motor built-in roller 11 is driven, the pinion 35 moves along the rack 6. As a result, the movable part 8 rotates with respect to the fixed part 3. Here, the upper rail member 9 on the movable portion 8 side is placed on the lower rail member 5 on the fixed portion 3 side via the drum-shaped roller 7. The drum-shaped roller 7 is stably engaged with both the lower rail member 5 and the upper rail member 9. Therefore, when the pinion 35 moves along the rack 6, the upper rail member 9 rolls the drum-shaped roller 7 and further moves while being guided to the drum-shaped roller 7. And the position (angle) of the upper rail member 9 with respect to the lower rail member 5 changes every moment.

  That is, when viewed in plan, the positional relationship between the upper rail member 9 and the lower rail member 5 does not change, but the upper rail member 9 rotates on the spot with respect to the lower rail member 5 that stops. As a result, the position of the other end side B of the roller conveyor 2 integral with the upper rail member 9 (movable part 8) rotates.

  Here, the direction of the other end B of the turntable 1 from the first conveyor 21 side toward the second conveyor 22 side or toward the third conveyor 23 side can be controlled by the number of rotations of the pinion 35. For example, if the pinion 35 rotates n times, the turntable 1 rotates 90 degrees, and if the other end B faces the third conveyor 23 side from the first conveyor 21 side, the turntable 1 rotates 180 degrees when the pinion 35 rotates 2n times. It rotates and the other end part B faces the 2nd conveyor 22 side.

FIG. 13 shows a modification of the turntable 1 shown in FIG.
In the turntable 60 of FIG. 13, the lower rail member on the fixed portion 3 side is provided twice. That is, a first lower rail member 61 disposed on the outer side of the base 4 and a second lower rail member 62 disposed on the inner side are provided. The first lower rail member 61 and the second lower rail member 62 are arranged concentrically.

  A plurality of drum-shaped rollers 63 are arranged at equal intervals so as to straddle the first lower rail member 61 and the second lower rail member 62. A first upper rail member 64 (outer side) and a second upper rail member (inner side) are also provided on the corresponding movable part 8 side. Then, as shown in FIG. 14, the first upper rail member 64 and the second upper rail member 65 are mounted on the first lower rail member 61 and the second lower rail member 62 via the drum-shaped roller 63. Placed.

  When the rail member is doubled in this way, the operation of the movable part of the turntable is stabilized. Further, the weights of the movable part, the roller conveyor, and the object to be conveyed can be distributed and supported by the two annular lower rail members. Therefore, breakage and deformation of the lower rail member can be prevented.

  In the above example, the rack 6 (40) is provided on the base 4 (fixed portion 3) side, and the motor built-in roller 11 having the pinion 35 is provided on the mounting table 10 (movable portion 8) side. It is also possible to adopt the following configuration. For example, as shown in FIG. 16, a motor having a curved chain 55 fixed on the base 4 (fixed portion 3) side in an arc shape and a sprocket 56 instead of the pinion 35 on the mounting table 10 (movable portion 8) side. A built-in roller 11 is provided. That is, the rack 6 can be replaced by simply fixing the curved chain 55 to the base 4 with a member such as the fixing member 24. Also, as shown in FIG. 17, a plurality of holes 57 may be provided directly in the base 4. That is, the rack 6 can be omitted by providing a plurality of holes 57 concentrically with the lower rail member 5 by laser cutting or the like.

  In the case of a conventional turntable that handles heavy objects, the upper frame has a large diameter and supports a load with a large amount of bearings or the like to perform a turning operation. Therefore, the shaft for supporting the bearing using a large-diameter bearing is also thick, and the frame to which the shaft is attached becomes thick, which increases the weight of the turntable itself.

  However, in the turntable 1 embodying the present invention, a plurality of drum-shaped rollers 7 are arranged on the lower rail member 5 configured in an annular shape, and the upper rail member 9 is disposed on the plurality of drum-shaped rollers 7. Since it is arranged, it is possible to disperse and support the load on the transported object 51 and the movable portion 8. Therefore, there is no portion where the load is concentrated, and it can be easily configured with only inexpensive members.

DESCRIPTION OF SYMBOLS 1 Turntable 2 Roller conveyor 3 Fixed part 4 Base 5 Lower rail member 6 Rack 7 Drum-shaped roller 8 Movable part 9 Upper rail member 10 Mounting base 11 Motor built-in roller (drive means)
16 Stopper 35 Pinion 51 Conveyed object

Claims (7)

It is a turntable that is arranged at a branch portion of a conveyor device and changes the conveyance direction of the object to be conveyed,
The turntable includes a movable part on which a transported object can be placed and rotated, and a fixed part that supports the movable part,
The movable part is provided with an upper rail member,
The fixed portion is provided with a lower rail member,
The upper rail member is disposed on the lower rail member via a plurality of interposition members,
The upper rail member and the lower rail member are formed by annularly forming a linear member,
The turntable is characterized in that the interposition member has a drum shape.   2. The turntable according to claim 1, wherein the upper rail member and the lower rail member are linear members each having a circular or substantially circular cross section.   The turntable according to claim 1 or 2, further comprising an interval holding member that maintains a constant interval between the interposition members.   The turntable according to any one of claims 1 to 3, wherein the plurality of interposed members are arranged at equal intervals.   The turntable according to any one of claims 1 to 4, wherein the linear member is a steel pipe or a round steel bar. An annular or arc-shaped rack is provided concentrically with the upper rail member and the lower rail member on either one of the fixed portion and the movable portion,
6. The pinion that engages with the rack is provided on the other of the fixed part and the movable part, and driving means for driving the pinion is provided. Turntable.   The turntable according to any one of claims 1 to 6, wherein the movable part is provided with a conveying means for conveying an object to be conveyed.

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