Rotating table

Abstract

To provide a rotary table which can easily accommodate repairs and specification changes. [Means for solving the problem] The top surface 2 is formed by stacking plate materials of an upper layer 10, an intermediate layer 20, and a lower layer 30, and fixing them with a connecting material J. The top surface 2 is rotatably supported by a thrust bearing 3 on a base portion 4. Many pairs of preforms P are fixed with the upper layer 10 sandwiched therebetween. The intermediate layer 20 has a cutout portion 21 opened therein for allowing the preforms P arranged on the back side of the upper layer 10 to escape. The lower layer 30 is provided with a housing groove 31 against which the thrust bearing 3 abuts, and the base portion 4 is provided with a housing groove 4a against which the lower surface of the thrust bearing 3 abuts, and a plurality of ball rollers 5 are fixed to the outer periphery of the housing groove 4a.

Description

[Technical field]

[0001] The present invention relates to a rotary table having a jig for mounting a product disposed on the top surface thereof, and more particularly to a rotary table that can easily accommodate repairs or changes in specifications. [Background technology]

[0002] In a factory production line, work tables called line pallets move along the conveyor line. Products are placed on the line pallets and transported to the processing area, assembly area, and inspection area installed along the production line, where the necessary operations are carried out before being shipped.

[0003] Patent Document 1 shows an example of a line pallet. In this known line pallet, a template is screwed to the top surface of the square line pallet body. This template is used to fix and position the product, and can be freely replaced in response to changes in the shape of the product.

[0004] Non-Patent Document 1 discloses a rotating table type line pallet. The line pallet has a rotatable top surface, which allows work to be done freely from any direction of 360 degrees, improving work efficiency. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-96427 [Patent Document 2] Patent No. 7309249 [Non-patent literature]

[0006] [Non-Patent Document 1] Rotary table https: / / www.daiichigosei.co.jp / products / rotary-table / (Retrieved November 7, 2024) Summary of the Invention [Problem to be solved by the invention]

[0007] In the line pallet disclosed in Patent Document 1, a flat template is used to fix and position the product. In the case of a product that is relatively unstable, there is a risk that the product may climb over the template or fall over while being moved on the production line. In particular, line pallets with a rotatable top surface tend to move easily due to centrifugal force, as they are rotated with products loaded on them. In particular, there is a high risk of products tipping over if they are awkwardly shaped. Therefore, when loading products onto the top surface, a separate jig with a large three-dimensional shape is attached to the top surface to fix the products in place. However, currently, turntables with jigs on the top surface are made to order according to the intended use, and turntables with jigs corresponding to each of the wide variety of products must be prepared, which creates issues of purchasing and repair costs and storage space pressure.

[0008] In addition, the top surface of the turntable is made of a single material such as steel, wood, or resin, and users cannot customize the material to suit their product, so they have no choice but to use the existing material. Therefore, depending on the application, it may be too strong or too heavy. If the weight becomes too heavy, it becomes difficult to rotate. Also, if the top surface is damaged, it is not designed to be partially replaced. SUMMARY OF THE PRESENT EMBODIMENT In order to solve the above problems, an object of the present invention is to provide a rotary table which can easily accommodate repairs and changes in specifications. [Means for solving the problem]

[0009] According to the present invention, a rotary table includes a top surface portion in which upper, middle and lower plate materials are laminated and fixed with a connecting material, a thrust bearing on which the top surface portion is rotatably mounted, and a base portion that supports the thrust bearing, In the upper layer, a plurality of pairs of connecting windows are opened at equal angular intervals around the rotation center, A plurality of pairs of injection-molded preforms each having a rectangular flat portion in the center and a male connecting portion and a female connecting portion on opposite sides of the flat portion are connected via a pair of connecting windows provided in the upper layer, with one male connecting portion facing the other female connecting portion across the upper layer, the intermediate layer has a cutout portion for allowing the preforms arranged on the back side of the upper layer to escape, the cutout portion being opened at one location corresponding to each preform; The lower layer is provided with an accommodation groove against which an upper surface of the thrust bearing abuts, The base portion is provided with an accommodation groove against which the lower surface of the thrust bearing abuts, and a plurality of ball rollers are fixed to the outer periphery of the accommodation groove. Effect of the Invention

[0010] According to the turntable of the present invention, the jig with a shape to receive the product on the top surface uses a support member and a receiving member, and the top surface is constructed by combining multiple plate materials with a detachable connecting material, making it easy to select the material and meeting the requirements for strength and weight reduction. In addition, all parts including the top surface and the jig can be easily replaced without using adhesives or double-sided tape, reducing the cost of repairs and specification changes. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram illustrating a rotary table. [Diagram 2] FIG. [Diagram 3] FIG. 13 is a diagram illustrating a rotary table partition plate. [Figure 4] 4A and 4B are diagrams illustrating a pillow member and a receiving member. [Diagram 5] FIG. 13 is a diagram illustrating a connecting material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a detailed description will be given of one embodiment with reference to the drawings. Fig. 1A shows a turntable 1 to which the present invention is applied to a line pallet used in a production line. The turntable 1 has a circular top surface 2 on which a product is placed, and a rectangular base portion 4 that supports the top surface 2. A thrust bearing (not shown) is disposed between the top surface 2 and the base portion 4, and the top surface 2 is rotatable about a central axis c that passes through the center. As shown in an example of a production line 6 in Fig. 1B, a large number of base portions 4 of the turntable 1 are disposed on the production line 6, and are moved automatically or manually.

[0013] The top surface portion 2 is provided with a plurality of pillow members 40 shown in Fig. 1C at equal angular intervals around the central axis c as jigs corresponding to the product. The pillow member 40 is a member having a rectangular molded surface portion 41 and male and female connectors 42, 43 on its opposite sides, and a shape F that matches the product shape is formed on the molded surface portion 41 by vacuum molding. The pillow member 40 is used in pairs with a receiving member 50. The pillow member 40 and the receiving member 50 will be explained in detail later in Fig. 4, but the receiving member 50 is a member having a rectangular surface support portion 51 and male and female connectors 52, 53 on its opposite sides.

[0014] FIG. 2 shows the rotary table 1 in an exploded state. The top surface 2 is composed of three plates having a circular outer shape. These plates are fixed by a first member 60 and a second member 70 (indicated by the symbol J in FIG. 1). The material of the plates can be selected, and the desired strength and performance can be obtained by combining and stacking plates having different properties. In this embodiment, the upper layer 10 and the middle layer 20 are plastic corrugated cardboard, and the lower layer 30 is a foamed molded product. Examples of foamed molded products include Durawood (registered trademark No. 922397 of BASF INOAC Polyurethanes Co., Ltd.) and Paronia (registered trademark No. 3297645 of Mitsui Chemicals, Inc.). Durawood is a foamed molded product made mainly of polyethylene and expanded to about twice its original size, and Paronia is a foamed molded product made mainly of polypropylene and polyethylene and expanded to about three times its original size. These are lightweight, highly durable, and recyclable materials, and are used as a substitute for wood in various industries.

[0015] The role of each layer will be described. The upper layer 10 is a layer for fixing the pillow member 40. A pair of rectangular mounting windows 11, 11 is formed for each pillow member 40. In this embodiment, four pillow members 40 are provided, so there are also four pairs of mounting windows 11, 11. The middle layer 20 is a layer for reducing the thickness of the receiving member 50 for fixing the pillow member 40, and a cutout portion 21 for allowing the receiving member 50 to escape is opened in one place corresponding to the receiving member 50.

[0016] The lower layer 30 is a layer that maintains the smoothness of the raceway of the ball roller 5. A circular accommodation groove 31 that accommodates the ring-shaped thrust bearing 3 and whose upper surface abuts against the bottom surface is machined into the lower surface of the lower layer 30.

[0017] Additionally, a number of connecting holes 12, 22, 32 are provided in the upper layer 10, middle layer 20, and lower layer 30, respectively, so that the layers communicate when stacked. The three layers are connected by a connecting material J consisting of a first member 60 and a second member 70, using the connecting holes 12, 22, 32. The first member 60 and the second member 70 of the connecting material J can be fitted together and detached, and the first member 60 and the second member 70 make it easy to separate and rearrange the layers.

[0018] In this embodiment, the upper layer 10 and the middle layer 20, which do not require strength, are made of hollow molded materials such as plastic corrugated cardboard, so that weight and strength are not increased unnecessarily. On the other hand, the lower layer 30, which requires strength and therefore requires cutting, is made of a relatively dense foamed solid wood, so that the strength and weight of the top surface 2 is adjusted.

[0019] The thrust bearing 3 has an upper ring 3a, a lower ring 3b, and a ball or roller bearing disposed between them. A circular accommodation groove 4a that accommodates the thrust bearing 3 and against which the lower surface of the thrust bearing 3 abuts is cut into the upper surface of the base portion 4. In addition, on the outer periphery of the accommodation groove 4a, on the surface of the base portion 4, a plurality of ball rollers 5 are disposed at equal angular intervals (90 degree intervals in this embodiment). The distances from the central axis c of each ball roller 5 are not the same, but are shifted. The distances from the central axis c of each ball roller 5 are set to a distance that allows it to be located directly below where the pillow member 40 and the receiving member 50 are disposed.

[0020] The rotating table 1 has a structure in which a top surface 2 and a base 4 are stacked with a thrust bearing 3 in between, and because these are not glued together, they can be separated into upper and lower halves via the thrust bearing 3. This improves the ease of work when repairing or changing specifications.

[0021] The base portion 4 may be formed of a single plate material, or may be formed by stacking a number of plate materials and fixing them together with a connecting member J.

[0022] In this embodiment, the number of pillow members 40 attached to the top surface portion 2 is four, but the load resistance can be increased by increasing the number to five or six.

[0023] 3 is a diagram for explaining in more detail the configuration when plastic corrugated cardboard is used as the material for the upper layer 10. When four pillow members 40 are provided on the top surface portion 2 at 90 degrees each, each pair of mounting windows 11, 11 opened in the upper layer 10 has an angle that intersects with the grain direction m of the plastic corrugated cardboard. By setting this angle at 45 degrees, the four pillow members 40 can have uniform strength.

[0024] FIG. 4 is a diagram for explaining the pillow member 40 and the receiving member 50. In this embodiment, a common member called a preform P is used for the pillow member 40 and the receiving member 50. The preform P is a member formed by injection molding of thermoplastic resin such as polyester, polyolefin, polyamide, polycarbonate, etc., and is made of a plate material having a substantially rectangular shape in a plan view. It is called a preform because it is a member whose shape is made in advance by injection molding. In FIG. 4A, the preform has a rectangular flat plate portion P1 in the center. The flat plate portion P1 is a portion where a desired shape can be easily formed by vacuum molding. The flat plate portion P1 corresponds to the molded surface portion 41 in the pillow member 40, and corresponds to the surface support portion 51 in the receiving member 50. The flat plate portion P1 has a male connecting portion P2 and a female connecting portion P3 on opposite sides. These correspond to the male connecting portions 42, 52 and the female connecting portions 43, 53.

[0025] The male connecting portion P2 and the female connecting portion P3 can be connected / separated from each other. Specifically, in Fig. 4B, two preforms PA and PB are placed back to back, and the male connecting portion P2 and the female connecting portion P3 face each other. The preform PA is the pillow member 40, and the preform PB is the receiving member 50. In Fig. 4B, the upper layer 10 is between the two preforms PA and PB.

[0026] As the engaging claw P4 of the male connecting part P2 enters the opening P6 of the female connecting part P3, the engaging claw P4 is elastically deformed by the step P7 of the opening P6. Then, when the shoulder P5 of the engaging claw P4 passes the step P7, the elastic deformation is released and the shoulder P5 rides up onto the locking surface P8 of the step P7 and engages with it. The two preforms PA, PB are inseparable from each other as the male connecting part P2 of one engages with the female connecting part P3 of the other.

[0027] FIG. 4C shows the state where the intermediate layer 20 and the lower layer 30 are further stacked on top of each other. The preform PB fixed to the upper layer 10 protrudes into the punched portion 21 of the intermediate layer 20, and the thickness of the intermediate layer 20 is selected so as to be equal to the thickness of this protrusion. By selecting the thickness of the intermediate layer 20 in this way, the preform PB (receiving member 50) comes into direct contact with the lower layer 30. If the lower layer 30 is made of a resin molding material such as Durawood that has a higher density than plastic corrugated cardboard, it is easy to ensure the strength of the top surface portion 2 even if plastic corrugated cardboard is used in combination with the upper layer 10 and the intermediate layer 20. Then, by making the preform PA on the upper side of the upper layer 10 into a vacuum-molded pillow member 40 and making the lower side into the preform PB as it is, the function of the pillow and the function of reinforcing the strength of the top surface portion 2 can be combined.

[0028] The pillow member 40 and the receiving member 50 are arranged directly above the circumferential track on which the ball rollers 5 are arranged. Therefore, the load of the product mounted on the pillow member 40 can be directly transmitted from the surface support portion 51 of the receiving member 50 to the lower layer 30.

[0029] In addition, the distance from the central axis c of each ball roller 5 is not the same, but is shifted. By arranging the ball rollers 5 in this manner, the passing trajectory of each ball roller 5 is made different, dispersing the load and reducing wear of the surface support portion 51.

[0030] As the preform P, the member shown in Patent Document 2 can be used.

[0031] 5 is a drawing showing a connecting member J. A female connecting member 60 has a first base plate 61 provided with a jig insertion opening 62 whose inner peripheral surface has a circular contour line, a pair of guide plates 63, 63 erected on the inner surface of the first base plate 61 in parallel with each other and symmetrically sandwiching the jig insertion opening 62, and a plurality of engagement portions 64a to 64c provided in pairs on opposing surfaces of the pair of guide plates 63, 63 so as to protrude in a direction parallel to the first base plate 61.

[0032] The male connecting member 70 has a second base plate 71 and a pair of flat engaging claws 72, 72 arranged in parallel to each other and standing on the second base plate 71. The engaging claws 72, 72 have protrusions 73, 73 formed to be engageable with the engaging portions 64a to 64c of the female connecting member 60.

[0033] In addition, for example, a member as disclosed in Japanese Patent No. 7007767 can be used as the detachable connecting member J. In addition, members as disclosed in Japanese Patent Application Laid-Open No. 2006-083936, Japanese Patent Application Laid-Open No. 2015-206417, etc. can also be used.

[0034] According to the turntable 1 of this embodiment, a pillow member 40 having a shape capable of receiving a product is arranged on the top surface 2, and the combination of the board materials of each layer 10, 20, 30 satisfies the requirements for strength and weight reduction, while the connecting material J allows all the components to be easily replaced, thereby reducing the cost of repairs and specification changes and shortening the production time.

[0035] The pillow member 40 can be made into the desired shape F by simply adding additional shape to the preform P formed by injection molding using vacuum molding, and by replacing this pillow member 40, it is easy to switch to other products, and furthermore, by changing the top surface part 2, the number and arrangement positions of the pillow members 40 can be optimized according to the product. By molding the preform P using a general-purpose mold (Patent No. 7333682), further shortening of the production time is expected.

[0036] Moreover, the pillow member 40 can be used in the state of the preform P as it is (without vacuum molding), and by adding other members to the molded surface portion 41, functions such as anti-slip properties and cushioning properties can be added.

[0037] In this way, in situations where frequent specification changes, partial repairs, etc. are required, it is possible to respond in a shorter time and at a lower cost than with conventional products.

[0038] In this embodiment, the required strength and performance can be obtained by combining plate materials with different properties and laminating each layer. In other words, by using solid wood for the lower layer 30, which requires cutting, and hollow molded members for the upper layer 10 and middle layer 20, which do not require strength, it is possible to configure the structure without increasing weight or strength unnecessarily. In addition, the plate materials for each layer can be rearranged, so that only the relevant layer can be replaced when repairing damage or changing functions, which is effective in reducing costs.

[0039] Any material may be used for the plates of the upper layer 10, the middle layer 20, and the lower layer 30. Materials other than plastic corrugated cardboard and foam molded products, such as iron, resin, paper, wood, etc., may be combined. Even if the thickness of the plates is changed by using these materials, in this embodiment, the connecting material J having a height adjustment function by the multiple engaging portions 64a to 64c is used, and it is possible to accommodate plate layers of various thicknesses. [Explanation of symbols]

[0040] J Connecting material P Preform P1 flat plate part P2 connection part P3 connection part P4 engaging claw P5 Shoulder P6 opening P7 Step P8 Locking surface PA, PB preforms 1 Rotating table 2 Top section 3 Thrust bearing 3a Upper Ring 3b Lower Ring 4 Base 4a Receiving groove 5 Ball Roller 6 Production Lines 10 upper layer 11 Mounting window 12, 22, 32 connection hole 20 Middle Class 21 Punching part 30 Lower layer 31 Storage Groove 40 Pillow parts 41 Surface to be molded 42, 43 Connection part 50 Receiving member 51 plane support part 52, 53 Connection part 60 Connecting material 61 First Base Plate 62 Jig insertion hole 63 Guide plate 64a~64c Engagement part 70 Connecting material 71 Second Base Plate 72 Engagement Claw 73 Convex

Claims

1. A rotary table having a top surface portion in which upper, middle and lower plate materials are stacked and fixed with a connecting material, a thrust bearing on which the top surface portion is rotatably mounted, and a base portion supporting the thrust bearing, In the upper layer, a plurality of pairs of connecting windows are opened at equal angular intervals around the rotation center, A plurality of pairs of injection-molded preforms each having a rectangular flat portion in the center and a male connecting portion and a female connecting portion on opposite sides of the flat portion are connected via a pair of connecting windows provided in the upper layer, with one male connecting portion facing the other female connecting portion across the upper layer, the intermediate layer has a cutout portion for allowing the preforms arranged on the back side of the upper layer to escape, the cutout portion being opened at a location corresponding to each preform; The lower layer is provided with an accommodation groove against which an upper surface of the thrust bearing abuts, a housing groove for receiving the lower surface of the thrust bearing, the housing groove having a plurality of ball rollers fixed to an outer periphery thereof;

2. 2. The turntable of claim 1, wherein the top layer is made of plastic corrugated cardboard; A rotating table characterized in that the connecting window is opened in a direction intersecting the grain of the plastic corrugated cardboard.

3. 2. The turntable of claim 1, wherein the plurality of ball rollers are disposed at equal angular intervals with respect to the center of rotation and at different distances from each other, A rotary table characterized in that the pairs of preforms are arranged directly above a track along which the plurality of ball rollers pass.

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