Turn table for stretch film packaging machine

Abstract

To provide a low-floor turn table for a stretch film packaging machine.SOLUTION: A turn table for a stretch film packaging machine for stretch-packaging an object with a packaging film comprises a base plate 10, a top plate 20, a roller 30, a bearing 40, a gear 50, and a motor 60. The roller 30 is constituted to be rotatable with a radial direction, perpendicular to a rotational axis R, as an axis, and supports the top plate from a rear surface side. A rotary wheel 41 of the bearing 40 is fixed to the rear surface of the top plate 20 and is not brought into contact with the base plate 10, and a fixed wheel 42 is connected to the base plate 10 and is not brought into contact with the top plate 20, and a rolling element 43 is arranged between inner and outer peripheral surfaces of the rotary wheel 41 and the fixed wheel 42 for reducing friction between the rotary wheel 41 and the fixed wheel 42. The gear 50 rotates the top plate 20 with the rotational axis R as a center. The motor 60 is arranged at a position separated away by a predetermined distance from the top plate 20 and rotates the gear 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a turntable for a stretch film wrapping machine, and more particularly to a turntable used in a stretch film wrapping machine for stretch wrapping objects with a wrapping film. [Background technology]

[0002] When a large number of packages such as cardboard boxes and bags are loaded onto a pallet for storage in a warehouse or for delivery, the packages are stretch-wrapped by wrapping them in packaging film to prevent them from collapsing. Various stretch film packaging machines have been developed to automate the task of stretch-wrapping such packages and other objects with packaging film (for example, Patent Document 1).

[0003] Such a stretch film packaging machine includes a turntable on which the object is loaded and a film supplying machine. The turntable is rotated to rotate the object while the film supplying machine wraps the packaging film around the side of the object. During this process, the rotation of the turntable and the supply speed of the packaging film by the film supplying machine are synchronized, and the supply amount of the packaging film and the winding height are adjusted in accordance with the rotation of the turntable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7185362 Summary of the Invention [Problem to be solved by the invention]

[0005] In such a turntable for a stretch film packaging machine, a motor for rotating the turntable is generally placed under the turntable, and the turntable is rotated directly by the motor shaft. Therefore, the height of the turntable from the ground surface is greater than or equal to the height of the motor. Therefore, when a pallet on which goods are placed is placed on the turntable by a forklift or the like, the height to which the pallet is lifted must be made high. Furthermore, if the turntable is high, the height to which the film can be supplied by the film supplying device must also be made high.

[0006] For this reason, there has been a demand for the development of a lower-floor turntable for a stretch film packaging machine that would make it easier to place cargo on the turntable and eliminate the need to increase the height at which the film supplying machine can supply film.

[0007] SUMMARY OF THE PRESENT EMBODIMENT In view of the above circumstances, the present invention provides a low-floor turntable for a stretch film packaging machine. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object of the present invention, the turntable for a stretch film packaging machine according to the present invention comprises: a base plate arranged perpendicular to the rotation axis; a top plate arranged parallel to the base plate and rotatable about the rotation axis, with an object placed on its surface; a plurality of rollers arranged rotatable about an axis in a radial direction perpendicular to the rotation axis and supporting the top plate from the back side; a bearing arranged between the base plate and the top plate, the bearing consisting of a rotating ring, a fixed ring and a rolling element, the rotating ring being fixed to the back side of the top plate and rotatable about the rotation axis without touching the base plate, the fixed ring being connected to the base plate and arranged coaxially with the rotating ring without touching the top plate, the rolling element being arranged between the inner and outer peripheral surfaces of the rotating ring and the fixed ring to reduce friction between the rotating ring and the fixed ring; a gear for rotating the top plate about the rotation axis; and a motor arranged at a position spaced a predetermined distance from the top plate for rotating the gear.

[0009] Here, the fixed ring of the bearing may be any type that is journalled on a centre boss that is arranged coaxially with the rotation shaft of the base plate.

[0010] Also, the fixed ring of the bearing may be thinner than the rotating ring.

[0011] Also, the fixed ring of the bearing may be fixed to the base plate.

[0012] The base plate may also have a relief hole in which at least a part of the roller is embedded.

[0013] Furthermore, the rotating ring of the bearing may be the outer ring and the fixed ring may be the inner ring, and the gear may be fixed to the outer circumferential surface of the rotating ring.

[0014] The gear may also be fixed to the underside of the top plate.

[0015] Furthermore, it is sufficient if it is provided with a chain for transmitting the rotation of the motor to the gears. Effect of the Invention

[0016] The turntable for a stretch film packaging machine of the present invention has the advantage of being low-floor. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic, partially cutaway top view illustrating a turntable for a stretch film packaging machine according to the present invention. [Diagram 2] FIG. 2 is a schematic enlarged cross-sectional side view for explaining the turntable for the stretch film packaging machine of the present invention. [Diagram 3] FIG. 3 is a schematic enlarged top view for explaining a bearing of the turntable for the stretch film packaging machine of the present invention. [Figure 4]FIG. 4 is a schematic enlarged cross-sectional side view for explaining a bearing of a turntable for a stretch film packaging machine according to the present invention. [Diagram 5] FIG. 5 is a schematic enlarged cross-sectional side view for explaining the base plate and rollers of the turntable for the stretch film packaging machine of the present invention. [Figure 6] FIG. 6 is a schematic enlarged cross-sectional side view for explaining another bearing of the turntable for a stretch film packaging machine of the present invention. [Figure 7] FIG. 7 is a schematic, partially cutaway top view illustrating another example of a turntable for a stretch fill packaging machine according to the present invention. [Figure 8] FIG. 8 is a schematic enlarged cross-sectional side view for explaining another example of the turntable for a stretch film packaging machine of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The turntable for a stretch film packaging machine of the present invention is configured to be rotatable around a rotation axis and is used for stretch packaging an object with a packaging film. Fig. 1 is a schematic partially cutaway top view for explaining the turntable for a stretch film packaging machine of the present invention. Fig. 2 is a schematic enlarged side sectional view for explaining the turntable for a stretch film packaging machine of the present invention. In the drawings, parts with the same reference numerals as those in Fig. 1 represent the same items.

[0019] As shown in the figure, the turntable for a stretch film packaging machine of the present invention comprises a base plate 10, a top plate 20, rollers 30, bearings 40, gears 50, and a motor 60.

[0020] The base plate 10 is disposed perpendicular to the rotation axis R. The base plate 10 serves as the base of the turntable for the stretch film packaging machine of the present invention. All of the above-mentioned components may be disposed on the base plate 10. However, for example, in the case of a fixed turntable that is fixed directly to the floor surface, the floor surface may serve as the base plate 10.

[0021] The top plate 20 is a plate on which an object is placed. The top plate 20 is disposed parallel to the base plate 10. That is, the base plate 10 and the top plate 20 are disposed parallel to each other with a predetermined gap therebetween. The top plate 20 is configured to be rotatable about a rotation axis R.

[0022] The rollers 30 are for supporting the top plate 20 from the back side. The rollers 30 are configured to be rotatable about axes in the radial direction perpendicular to the rotation axis R. In the illustrated example, the rollers 30 are arranged radially at multiple locations. The turntable for a stretch film packaging machine of the present invention is structured so that the rollers 30 support the top plate 20 from the back side.

[0023] The bearing 40 comprises a rotating wheel 41, a fixed wheel 42, and a rolling element 43. The bearing 40 is disposed between the base plate 10 and the top plate 20. FIG. 3 is a schematic enlarged top view for explaining the bearing of the turntable for a stretch film wrapping machine of the present invention. In the figure, parts with the same reference numerals as in FIG. 1 represent the same items. FIG. 4 is a schematic enlarged side cross-sectional view for explaining the bearing of the turntable for a stretch film wrapping machine of the present invention. In the figure, parts with the same reference numerals as in FIG. 2 represent the same items. Note that only the peripheral portion of the bearing 40 is shown, and other parts are omitted from the illustration.

[0024] As shown in the figure, the rotating wheel 41 is configured to be rotatable around the rotation axis R. The rotating wheel 41 is fixed to the rear surface of the tabletop 20. In the illustrated example, the rotating wheel 41 is fixed to the tabletop 20 by screws. However, the present invention is not limited to this, and the rotating wheel 41 may be fixed to the tabletop 20 by welding or the like, or may be integrally formed with the tabletop 20. The rotating wheel 41 is configured with a thickness such that it does not come into contact with the base plate 10. In the illustrated example, the rotating wheel 41 is the outer ring of the bearing 40.

[0025] The fixed ring 42 is disposed coaxially with the rotating ring 41. The fixed ring 42 is connected to the base plate 10. In the illustrated example, the fixed ring 42 is fixed and connected to the base plate 10 by screws. The fixed ring 42 is configured with a thickness such that it does not come into contact with the top plate 20. In the illustrated example, the fixed ring 42 serves as the inner ring of the bearing 40.

[0026] The rolling elements 43 are disposed between the inner and outer circumferential surfaces of the rotating ring 41 and the fixed ring 42. The rolling elements 43 are used to reduce friction between the rotating ring 41 and the fixed ring 42. The rolling elements 43 of the bearing 40 are made up of a plurality of balls constituting a so-called ball bearing. As shown in FIG. 3, the plurality of balls are evenly disposed between the inner and outer circumferential surfaces of the rotating ring 41 and the fixed ring 42. However, the present invention is not limited thereto, and the rolling elements 43 may be, for example, a plurality of rollers constituting a so-called roller bearing.

[0027] The gear 50 is for rotating the top plate 20 around the rotation axis R. The gear 50 in the illustrated example is fixed to the outer peripheral surface of the rotating wheel 41, which is an outer ring. More specifically, the gear 50 in the illustrated example is made of a sprocket. The rotating wheel 41 has a gear fixing flange 44 for fixing the gear 50. The gear fixing flange 44 is provided on the outer peripheral surface of the rotating wheel 41. That is, the bearing 40 constituted is a so-called flanged bearing. However, the present invention is not limited to the illustrated example, and as long as the gear 50 can be fixed to the rotating wheel 41, the flange structure is not necessary. For example, the rotating wheel 41 and the gear 50 may be integrally molded. The gear 50 in the illustrated example is fixed to the gear fixing flange 44 by a screw. In the turntable for a stretch film packaging machine of the present invention, the gear 50 does not necessarily need to be fixed to the rotating wheel 41, as long as the top plate 20 is ultimately rotated by the rotation of the gear 50. For example, the gear 50 may be fixed to the rear surface side of the top plate 20.

[0028] The bearing 40 used in the turntable for the stretch film packaging machine of the present invention has a special structure in which the rotating wheel 41 does not touch the base plate 10 and the fixed wheel 42 does not touch the top plate 20. Therefore, the top plate 20 fixed to the upper surface of the rotating wheel 41 is floating above the fixed wheel 42. Therefore, the top plate 20 can rotate without being affected by the fixed wheel 42.

[0029] 1 and 2 again. The motor 60 is for rotating the gear 50. The motor 60 is disposed at a position spaced a predetermined distance from the top plate 20. In order to lower the top plate 20, the motor 60 may be disposed at a position spaced a predetermined distance from the top plate 20 in a top view, rather than below the top plate 20. In the illustrated example, a chain 61 is used to transmit the rotation of the motor 60 to the gear 50. In the turntable for a stretch film packaging machine of the present invention, the bearing 40 is disposed coaxially with the rotation axis R, so that when the gear 50 is rotated by the motor 60 to rotate the top plate 20, the rotation can be performed smoothly.

[0030] Here, as described above, the bearing 40 used in the turntable for a stretch film packaging machine of the present invention constitutes a so-called radial bearing. A radial bearing generally supports a force applied in a direction perpendicular to the rotation axis. In the turntable for a stretch film packaging machine of the present invention, the rotation of the motor 60 is transmitted to the gear 50 using a chain 61, so the bearing 40 also supports a force applied in a direction perpendicular to the rotation axis R. In the turntable for a stretch film packaging machine of the present invention, the plate surface of the top plate 20 is arranged perpendicular to the rotation axis R, so at first glance, the bearing 40 appears to support a force applied in the same direction as the rotation axis R. However, in the turntable for a stretch film packaging machine of the present invention, the top plate 20 is supported from the back side by a plurality of rollers 30. Therefore, it is not necessary for the bearing 40 to support a force applied in the same direction as the rotation axis R. Therefore, there is no problem with the bearing 40 being a radial bearing structure. In addition, since it is not necessary to support a force applied in the same direction as the rotation axis R, it is not necessary to have a so-called thrust bearing structure. In addition, because thrust bearing structures have races arranged above and below the rolling elements, they are thicker than radial bearings, which can be an obstacle to making the floor lower.

[0031] Thus, according to the turntable for a stretch film packaging machine of the present invention, by incorporating the bearing 40 having a special structure between the base plate 10 and the top plate 20, it is possible to make it low-floor.

[0032] Here, in order to further lower the floor, the base plate 10 and the roller 30 may be structured as follows. FIG. 5 is a schematic enlarged side cross-sectional view for explaining the base plate and roller of the turntable for a stretch film packaging machine of the present invention. In the figure, the parts with the same reference numerals as in FIG. 2 represent the same objects. Note that only the peripheral part of the roller 30 is shown, and the other parts are omitted from the illustration. As shown, the base plate 10 has an escape hole 11 in which at least a part of the roller 30 is embedded. In the illustrated example, the escape hole 11 is an example formed by a recess. However, the present invention is not limited to this, and the escape hole 11 may be a through hole. The roller 30 is provided so that at least a part of it is embedded in the escape hole 11. In the illustrated example, the roller rotation shaft 31 of the roller 30 is arranged so as to be lower than half the distance between the base plate 10 and the top plate 20, so that a part of the radial thickness of the roller 30 is embedded in the escape hole 11.

[0033] If the top plate 20 can be supported by rollers 30 with a small diameter that can be accommodated within the distance between the base plate 10 and the top plate 20, there is no problem even if there are no escape holes 11. However, if there are limitations in the strength or structure of the rollers 30, the diameter of the rollers 30 can be made larger and part of the rollers 30 can be embedded in the base plate 10 as in the illustrated example. This allows for a lower floor while still maintaining the strength to withstand the load.

[0034] Here, the bearing 40 will be described in more detail with reference to FIG. 4 again. As shown in the figure, V-shaped grooves 41a and 42a are provided on the outer peripheral surface of the fixed ring 42 and the inner peripheral surface of the rotating ring 41 so as to face each other over the entire circumference. The rolling element 43 is arranged to be sandwiched between the V-shaped grooves 41a and 42a on the inner and outer peripheral surfaces. As shown in the figure, the V-shaped grooves 41a and 42a are arranged so that the heights in the thickness direction of the rotating ring 41 and the fixed ring 42 are different. Specifically, in the illustrated example, the V-shaped groove 42a of the fixed ring 42 is arranged at a position higher than the center in the thickness direction of the fixed ring 42, while the V-shaped groove 41a of the rotating ring 41 is arranged at a position lower than the center in the thickness direction of the rotating ring 41. In particular, when the fixed ring 42 is fixed to the base plate 10 as in the illustrated example, it is effective to arrange the V-shaped grooves 41a and 42a so that the heights in the thickness direction of the rotating ring 41 and the fixed ring 42 are different. As a result, even if the rotating wheel 41 and the fixed wheel 42 have the same thickness, it is possible to configure the rotating wheel 41 so that it does not touch the base plate 10 and the fixed wheel 42 so that it does not touch the top plate 20. In this way, the rolling body 43 is not only used to reduce friction between the rotating wheel 41 and the fixed wheel 42, but also functions to float the fixed wheel 42 due to the arrangement of the V-shaped grooves 41a and 42a.

[0035] As in the illustrated example described above, when the bearing 40 has a structure in which the rotating wheel 41 is fixed to the top plate 20 and the fixed wheel 42 is fixed to the base plate 10, there is a risk that an excessive load will be applied to the rolling body 43 and the roller 30 depending on the accuracy of each part during assembly. More specifically, if the finished dimensions of the bearing 40 are higher than the roller 30 due to a dimensional error, the rolling body 43 will be excessively subjected to the load of the top plate 20. On the other hand, if the finished dimensions of the bearing 40 are lower than the roller 30, the roller 30 will be excessively pressed against the top plate 20. Therefore, by configuring the bearing 40 as described below, it is possible to prevent the bearing 40 from receiving an excessive load and to provide a margin for dimensional error.

[0036] FIG. 6 is a schematic enlarged cross-sectional view for explaining another bearing of the turntable for a stretch film packaging machine of the present invention. In the figure, the parts with the same reference numerals as those in FIG. 4 represent the same objects. Note that only the peripheral portion of the bearing 40 is shown, and the other parts are omitted from the illustration. Also, in FIG. 6, an example is shown in which the base plate 10 is provided with an escape hole 11 in which at least a part of the roller 30 is embedded, but an example in which no escape hole is provided as shown in FIG. 4 may be used. In the illustrated example, the fixed ring 42 of the bearing 40 is journaled to a center boss 12 arranged on the base plate 10 coaxially with the rotation axis R. In the illustrated example, the center boss 12 is integrally formed with the base plate 10, but the present invention is not limited to this, and a center boss formed as a separate body may be fixed to the base plate 10 by welding, screws, or the like. In this way, when the fixed ring 42 is journaled to the center boss 12 and connected to the base plate 10, the fixed ring 42 is suspended via the rolling body 43 by the rotating ring 41 fixed to the top plate 20. Therefore, the fixed wheel 42 does not touch the tabletop 20, and further does not touch the base plate 10. Here, the fixed wheel 42 may be rotatably connected to the center boss 12, or may be connected to fit into, for example, the polygonal center boss 12 so as not to rotate. In the example shown in Fig. 6, when the tabletop 20 is lifted for maintenance work or the like, the fixed wheel 42 comes out of the center boss 12 together with the rotating wheel 41, and the entire bearing 40 is lifted together with the tabletop 20.

[0037] 6, when the fixed ring 42 is connected to the base plate 10 using the center boss 12, the thickness of the fixed ring 42 may be simply configured to be thinner than the thickness of the rotating ring 41. This makes it possible to configure the fixed ring 42 so that it does not touch the top plate 20 or the base plate 10. In this case, the V-shaped grooves 41a and 42a only need to be located at the center of the thickness direction of the rotating ring 41 and the fixed ring 42, respectively.

[0038] With this structure, the fixed wheel 42 is floating above the base plate 10, so even if the dimensional error of the bearing 40 is relatively large, it can be absorbed by the floating portion of the fixed wheel 42. Therefore, the rolling body 43 does not receive an excessive load from the top plate 20, and the roller 30 is not pressed down excessively by the top plate 20.

[0039] Next, the height of the turntable for the stretch film packaging machine of the present invention will be described with more specific dimensional examples. The specific dimensions exemplified below are merely examples, and the present invention is not limited to these. In the turntable for the stretch film packaging machine of the present invention, the height from the ground surface (lowest part) of the base plate 10 to the surface (upper part) of the top plate 20 is, for example, 25 mm. The diameter of the top plate 20 is φ1,200 mm. The plate thicknesses of the base plate 10 and the top plate 20 are each 4.5 mm for strength reasons. Therefore, the gap between the base plate 10 and the top plate 20 is 16 mm. It is necessary to design the bearing 40 and the gear 50 to fit in the 16 mm gap between the base plate 10 and the top plate 20. The inner diameter of the rotating wheel 41 is φ130.5 mm, the outer diameter is φ170 mm, and the thickness is 14.15 mm. The diameter of the fixed wheel 42 is φ127 mm, and the thickness is 13.5 mm. The gear fixing flange 44 has an inner diameter of φ170 mm, an outer diameter of φ200 mm, and a thickness of 4 mm. The gear 50 has an inner diameter of φ170 mm, an outer diameter of φ248 mm, and a thickness of 4.3 mm.

[0040] The inner peripheral surface of the rotating wheel 41 and the outer peripheral surface of the fixed wheel 42 are provided with 90° V-grooves 41a and 42a facing each other over the entire circumference. A rolling element 43 having a diameter of 8 mm is arranged to be sandwiched between the V-grooves 41a and 42a. In the present invention, the fixed wheel 42 does not touch the top plate 20 due to the difference in the arrangement positions of the V-grooves 41a and 42a. That is, the V-groove 41a of the rotating wheel 41 is arranged at a height of 6.15 mm from the bottom surface of the rotating wheel 41, while the V-groove 42a of the fixed wheel 42 is arranged at a height of 7 mm from the bottom surface of the fixed wheel 42. As a result, the rotating wheel 41 is raised 0.85 mm above the base plate 10 and raised 1.5 mm above the top surface of the fixed wheel 42. In the example shown in FIG. 6, coupled with the difference in thickness between the rotating wheel 41 and the fixed wheel 42, the fixed wheel 42 is raised from the base plate 10 by 1.5 mm.

[0041] In addition, considering the strength and structural limitations of the rollers 30 that support the top plate 20, the roller diameter of the rollers 30 is set to, for example, φ18 mm. Therefore, it is sufficient to provide the base plate 10 with relief holes 11 with a depth of 2 mm or more, and to configure the rollers 30 so that they are embedded 2 mm in the radial direction into the base plate 10. This makes it possible to apply roller diameters that exceed the 16 mm gap between the base plate 10 and the top plate 20.

[0042] Next, another example of the turntable for the stretch film packaging machine of the present invention will be described. FIG. 7 is a schematic partially cutaway top view for explaining another example of the turntable for the stretch film packaging machine of the present invention. FIG. 8 is a schematic enlarged side sectional view for explaining another example of the turntable for the stretch film packaging machine of the present invention. In the figure, parts with the same reference numerals as in FIG. 1 represent the same objects. The illustrated example described above is an example of a bearing in which the rotating wheel 41 is the outer wheel and the fixed wheel 42 is the inner wheel, but the examples shown in FIG. 7 and FIG. 8 are examples of a bearing 40 in which the rotating wheel 41 is the inner wheel and the fixed wheel 42 is the outer wheel.

[0043] As shown in the figure, a rotating wheel 41 serving as an inner wheel is fixed to the back surface of the top plate 20. As in the illustrated example described above, the rotating wheel 41 is configured with a thickness such that it does not touch the base plate 10. The fixed wheel 42 serving as an outer wheel is connected to the base plate 10 and configured with a thickness such that it does not touch the top plate 20. In the illustrated example, an example is shown in which the fixed wheel 42 is fixed and connected to the base plate 10 by a screw, but the present invention is not limited to this, and the fixed wheel 42 may be supported by a center boss as shown in FIG. 6. More specifically, the fixed wheel 42 may be supported by a center boss having a recess into which the outer periphery of the fixed wheel 42 fits.

[0044] In the illustrated example, in the case of a structure in which the rotating wheel 41 is the inner wheel, the gear 50 cannot be fixed to the outer circumferential surface of the rotating wheel 41 as shown in Fig. 3. For this reason, the illustrated example shows the gear 50 fixed to the back surface of the tabletop 20. Specifically, the gear 50 is fixed to a position on the back surface of the tabletop 20 that is more outer than the fixed wheel 42. The gear 50 is a gear, and for example, a pinion 62 is provided on the motor 60, and the rotation of the motor 60 is transmitted to the gear 50, which is a gear, via the pinion 62. Note that, as in the illustrated example described above, the gear 50 may be a sprocket, and the tabletop 20 may be rotated by a chain 61.

[0045] As shown in Figs. 7 and 8, in the turntable for a stretch film packaging machine of the present invention, either of the rotating wheel 41 and the fixed wheel 42 constituting the bearing may be the inner wheel.

[0046] Thus, according to the turntable for a stretch film packaging machine of the present invention, by incorporating the special bearing 40 between the base plate 10 and the top plate 20, it is possible to make it low-floor.

[0047] It should be noted that the turntable for a stretch film packaging machine of the present invention is not limited to the above-mentioned illustrated example, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0048] 10 Base plate 11 Relief hole 12 Center Boss 20 Tabletop 30. Laura 31 Roller rotation shaft 40 Bearing 41 Rotating Wheel 41a V-groove 42 Fixed wheel 42a V-groove 43 Rolling elements 44 Gear fixing flange 50 Gears 60 Motor 61 Chain 62 Pinion R rotation axis

Claims

1. A turntable configured to be rotatable around a rotation axis and used in a stretch film wrapping machine for stretch wrapping an object with a wrapping film, the turntable for the stretch film wrapping machine comprising: A base plate disposed perpendicular to the axis of rotation; A top plate is arranged on the base plate in parallel, is configured to be rotatable around a rotation axis, and has an object placed on its surface; A plurality of rollers configured to be rotatable about axes in a radial direction perpendicular to the rotation axis and for supporting the top plate from the back side; a bearing arranged between the base plate and the top plate, the bearing comprising a rotating ring, a fixed ring and rolling elements, the rotating ring being fixed to the underside of the top plate and configured to be rotatable around a rotation axis without touching the base plate, the fixed ring being connected to the base plate and configured coaxially with the rotating ring without touching the top plate, and the rolling elements being arranged between the inner and outer peripheral surfaces of the rotating ring and the fixed ring to reduce friction between the rotating ring and the fixed ring; A gear for rotating the top plate around a rotation axis; A motor that is disposed at a position spaced a predetermined distance from the top plate and rotates a gear; A turntable for a stretch film packaging machine, comprising:

2. 2. The turntable for a stretch film wrapping machine according to claim 1, wherein the fixed wheel of the bearing is supported by a center boss arranged coaxially with the rotation shaft on the base plate.

3. 3. The turntable for a stretch film wrapping machine according to claim 2, wherein the fixed ring of the bearing is thinner than the rotating ring.

4. 2. The turntable for a stretch film wrapping machine according to claim 1, wherein the fixed wheel of the bearing is fixed to a base plate.

5. 5. The turntable for a stretch film wrapping machine according to claim 1, wherein the base plate has an escape hole into which at least a part of the roller is embedded.

6. 2. The turntable for a stretch film packaging machine according to claim 1, The rotating ring of the bearing is an outer ring and the fixed ring is an inner ring, The gear is fixed to the outer circumferential surface of the rotating wheel. A turntable for a stretch film packaging machine.

7. 2. The turntable for a stretch film wrapping machine according to claim 1, wherein the gear is fixed to the back surface of the top plate.

8. 2. The turntable for a stretch film packaging machine according to claim 1, further comprising: A chain is provided for transmitting the rotation of the motor to a gear. A turntable for a stretch film packaging machine.

Images