JP2011080501A - Ball type support device and work conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball type support device capable of stopping a work being conveyed properly, and preventing dust from scattering even at further dust emission. <P>SOLUTION: The ball type support device includes a ball receiving part 10 having a side surface 13 formed between a rear surface 12 and a surface 11 forming a ball receiving seat 11a having a concave curved surface thereon, a large number of small balls 21 rollably arranged on the ball receiving seat 11a, and a main ball 22 rollably mounted on a large number of small balls 21 in such a manner that a part thereof projects from the surface 11 of the ball receiving part 10. Furthermore, the ball type support device includes a casing 50 for holding the side surface 13 of the ball receiving part 10, a stopper 40 reciprocating between a position in which a tip end 41a projects beyond a projecting top of the main ball 22 and a position in which the tip end 41a does not project, a compression spring 31 for energizing the stopper 40 toward the non-projecting position, and a fluid passage 51c for supplying air between the casing 50 and the stopper 40 for projecting the stopper 40 against the spring force of the compression spring 31. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a large number of small spheres are arranged in a freely rolling manner on a ball seat formed in a concave curved surface, and a single main sphere is placed on the large number of small spheres in a freely rolling manner. The present invention relates to a ball-type support device in which a ball-type support device is transferred in a point contact on a main sphere, and a work transfer device in which a large number of the ball-type support devices are arranged in parallel on a transfer line.

  As a means for transporting a plate-shaped workpiece, a box-shaped workpiece, or the like, a ball-type support device is provided. Patent Document 1 discloses a support body which is an example of a ball-type support device.

  As shown in FIG. 5, the support body has a concave curved ball receiving seat 111a formed on the surface (upper surface in the drawing) 111 of a cylindrical ball receiving portion 110, and a large number of the ball receiving seats 111a. Are arranged so as to roll freely, and one main sphere 122 is placed so as to roll freely on the small balls 121, 121,..., And a lid 130 is placed on the surface 111 of the ball receiving seat 111a. It is supposed to be covered. The lid 130 prevents the main ball 122 from falling off and prevents dust and the like from entering the ball receiving seat 111a.

  Such a support body is used for conveying a workpiece. In addition, the conventional roller conveyor which conveys a workpiece | work shall have many rollers arranged in parallel, and a workpiece | work moves on a roller.

Japanese Patent Laid-Open No. 10-181819

  In the conventional roller conveyor, the rollers are not accurately arranged in parallel. Therefore, the work on the roller travels in a deflected manner, and is therefore meandering slightly. If it does so, a workpiece | work will hit a guide rail and dust may be generated there. In addition, adjacent rollers may apply a force in different directions to the work, generate dust when the work is rubbed, and cause flaws.

  Furthermore, the work conveyed by the roller conveyor is moved to another place at a predetermined position. During this movement, the workpiece may stop on the roller conveyor. However, since the roller conveyor continues to rotate, the work and the belt may rub against each other, generating dust and wrinkles. Therefore, the roller conveyor is not only suitable for use in a clean room, but also not suitable for conveying a work that is prone to wrinkles.

  In order to solve such a problem, it is conceivable that the support is a ball-type support device provided with a stopper 140 for lifting the workpiece W from the main ball 122 as shown in FIG. The stopper 140 is formed in a bottomed cylindrical shape or a cylindrical shape that goes up and down by fitting the ball receiving portion 110, and the workpiece W is placed on the main ball 122 at a lowered position as shown in FIG. (B) The work W is placed and lifted at the raised position as shown, and is separated from the main ball 122.

  However, in such a ball-type support device, a sealed space S having a recess between the stopper 140 and the workpiece W is formed at the raised position of the stopper 140. Then, when the dust is confined in the sealed space S and the stopper 140 is lowered, the dust may be scattered on the turbulence of the airflow. Therefore, it can be said that this ball-type support device is not suitable for use in a clean room.

  In view of this, the present invention mainly provides a ball-type support device that can appropriately stop the workpiece being conveyed and prevents dust from scattering even if dust is generated, and a large number of such ball-type support devices in parallel. It is an object of the present invention to provide a workpiece transfer device.

  A ball-type support device according to the present invention includes a ball receiving portion having a side surface provided between a back surface and a surface on which a concave curved ball receiving seat is formed, and is arranged on the ball receiving seat so as to be freely rollable. A ball-type support device comprising a large number of small spheres and a single main sphere which is slidably mounted on the large number of small spheres so that a part of the small sphere protrudes from the surface of the ball receiving portion. Between the case where the side surface of the ball receiving portion is held so as to provide a space between the back surface of the ball receiving portion and the position where the tip protrudes from the protruding vertex of the main sphere and the position where it does not protrude A stopper that forms a sealed space with the case, an urging means that urges the stopper toward a position that does not protrude, and an urging force of the urging means Fluid for moving the stopper toward the protruding position It is characterized in that it comprises a fluid flow path for supplying the enclosed space between the casing and the stopper.

  According to this ball-type support device, when the tip of the stopper is in a position where it does not protrude from the top of the main sphere, the work is carried on the main sphere, and the tip of the stopper protrudes from the top of the main sphere. By doing so, the workpiece can be lifted by the stopper and separated from the main ball, and the workpiece can be stopped. Normally, the tip of the stopper is positioned so as not to protrude beyond the top of the main sphere by the biasing means, and when stopping the work, fluid is supplied from the fluid flow path into the sealed space and resists the biasing force of the biasing means. The stopper moves so that the tip of the stopper protrudes.

  Also, in the ball-type support means according to the present invention, the ball receiving portion is formed with one or a plurality of pin insertion holes penetrating from the front surface to the back surface, and the stopper is the pin insertion hole. A pin that is inserted into the front end and protrudes from the front surface of the ball receiving portion and has a proximal end portion protruding from the back surface of the ball receiving portion into the sealed space, and holds the proximal end portion of the pin in the sealed space. And it is preferable that it is provided with the piston part accommodated so that a reciprocating motion was possible in the sealed space between the back surface of the said ball | bowl receiving part, and the said case.

  According to this ball-type support device, the stopper is constituted by one or a plurality of pins, so that the work is not only supported in point contact with the pins but also between the work supported by the pins and the pins. It is possible to prevent a sealed space from being formed on the surface. And the piston part which hold | maintains the base end part of a pin is arrange | positioned in the sealed space part provided between the back surface of the ball | bowl receiving part, and a case, Fluid is supplied in sealed space and it is made not to supply. Thus, the stopper can be reciprocated in combination with the urging force of the urging member.

  Further, in the ball-type support device according to the present invention, the piston part includes a flat plate-like base part and a cylindrical part protruding from the outer periphery of the base part, and the ball receiving part is A reduced diameter portion having an outer diameter smaller than the inner diameter of the cylindrical portion is provided on the back surface side, and the urging means is provided between the cylindrical portion of the piston portion and the reduced diameter portion of the ball receiving portion. It is preferable that the compression spring is inserted into the.

  According to this ball-type support device, the piston portion is provided with the cylindrical portion, so that the piston portion is in sliding contact with the inner surface of the case over a wide range, and therefore the reciprocating motion of the piston is stabilized, and the biasing means is the piston. By comprising a compression spring inserted between the cylindrical portion of the portion and the reduced diameter portion of the ball receiving portion, the configuration can be simplified.

  Also, a workpiece transfer device according to the present invention includes any one of the ball-type support devices according to the present invention arranged in parallel so as to support at least both sides of the bottom surface of the workpiece on the transfer line, and the workpiece on the transfer line. It is characterized in that it is provided with conveying means arranged so as to be in contact with the bottom surface.

  According to this work transfer device, both sides of the bottom surface of the work are supported by the main ball of the ball type support device according to the present invention, thereby stopping the work being transferred and preventing dust from being scattered. Can be. Since the ball-type support device itself is not equipped with a function for transferring the workpiece, the ball-type support device is provided with a transfer means at the center of the bottom surface of the work, and the transfer means contacts the bottom surface of the work. The supported work can be transported.

  Moreover, it is preferable that the workpiece conveyance device according to the present invention further includes any one of the ball-type support devices according to the present invention arranged in parallel so as to contact each side surface of the workpiece on the conveyance line.

  According to this work conveyance device, the ball-type support device arranged so as to abut on each side surface of the work is like a guide rail, and the work can be conveyed so as not to come off the conveyance line. When the stopper of this ball-type support device comes into contact with the side surface of the workpiece, the workpiece can be stopped from the side surface.

  According to the present invention, the workpiece being transported can be stopped appropriately, and dust generated when the workpiece is stopped can be prevented from scattering, so that it can be suitably used in a clean room or the like. A ball-type support device and a workpiece transfer device can be provided.

It is a section perspective view showing one embodiment of a ball type supporting device concerning the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is one Embodiment of the ball-type support apparatus which concerns on this invention, Comprising: (a) is a top view, (b) is a sectional front view in the state where the stopper does not protrude, (c) is a cross section in the state where the stopper protrudes It is a front view. It is one Embodiment of the workpiece conveyance apparatus which concerns on this invention, Comprising: (a) is a top view, (b) is a front view. BRIEF DESCRIPTION OF THE DRAWINGS It is one Embodiment of the workpiece conveyance apparatus which concerns on this invention, Comprising: (a) is a partial cross section side view when not conveying a workpiece | work, (b) is when a ball-type support apparatus is supporting the workpiece | work. It is a partial cross section side view. It is front sectional drawing which shows an example of the conventional ball-type bearing apparatus (bearing body). FIG. 6 is a cross-sectional front view showing a state where the stopper is protruding, and FIG. 5B is a cross-sectional front view showing a state where the stopper is not protruding, and FIG.

  An embodiment of a ball-type support device and a workpiece transfer device according to the present invention will be described with reference to FIGS. 1 to 4. The ball bearing device includes a ball receiving portion 10, a large number of small balls 21, 21,.

  The ball receiving portion 10 has a deformed columnar shape in which a side surface 13 is provided between the front surface 11 and the back surface 12, and a concave curved ball receiving seat 11 a is formed on the front surface 11.

  A large number of small spheres 21, 21,... Are arranged on the ball receiving seat 11 a so as to be able to roll, and one main sphere 22 is placed on the large number of small spheres 21, 21,. Yes. A central portion of the main sphere 22 is located in the ball receiving portion 10, and a part of the main sphere 22 protrudes from the surface 11 of the ball receiving portion 10.

  The small spheres 21, 21,... Are not arranged up to the surface 11 of the ball receiving portion 10, but a space is provided between the portion of the surface 11 of the ball receiving portion 10 and the main sphere 22, A ring-shaped lid 30 is fitted. Although a gap is provided between the lid 30 and the main sphere 22, the lid 30 prevents dust and the like from entering the ball receiving seat 11a and prevents the main sphere 22 from dropping off. Has been.

  The ball-type support device according to the present invention includes a stopper 40 that reciprocates. The tip of the stopper 40 reciprocates between a position where the main sphere 22 protrudes from a top where the main sphere 22 protrudes from the surface 11 of the ball receiving portion 10 (hereinafter simply referred to as “vertex”) and a position where it does not protrude. Has been.

  Such a stopper 40 includes one or a plurality (three in the drawing) of pins 41 and a piston portion 42 that holds the base end portion of the pins 41. Therefore, a pin insertion hole 14 penetrating from the front surface 11 to the back surface 12 is formed in the ball receiving portion 10.

  The stopper 40 is separated into the pin 41 and the piston portion 42, so that the pin 41 is formed of a resin that does not easily damage the workpiece W, and the piston portion 42 can be formed of stainless steel having excellent durability. it can. However, the pin 41 and the piston portion 42 may be integrally formed.

  And the piston part 42 is formed in the bottomed cylinder shape which consists of the disk-shaped base part 42a and the cylindrical part 42b protrudingly provided by the outer periphery of this base part 42a. A groove is formed on the outer periphery of the cylindrical portion 42b, and an O-ring 43 is fitted into the groove. And the front end side of the cylindrical part 42b is formed in the thin shape which expanded the inner periphery, the level | step-difference part 42c is provided, and also the inward protrusion 42d was formed in the front-end | tip edge.

  On the other hand, at the base end portion of the pin 41, a groove portion into which the protrusion 42d of the piston portion 42 is fitted is formed. The protrusion 42d is fitted in the groove of the pin 41 from the outer periphery of the stopper 40 toward the central axis. Although not shown, the distal end side of the cylindrical portion 42b has a reduced outer diameter, and an outward protrusion 42d is formed at the distal end edge. The protrusion 42d extends from the central axis of the stopper 40 toward the outer periphery. The pin 41 may be fitted into the groove.

  The end surface on the proximal end side of the pin 41 is placed on the stepped portion 42 c of the piston portion 42. In this way, the pin 41 and the piston portion 42 are integrated. The pin 41 is not displaced by being inserted into the pin insertion hole 14 of the ball receiving portion 10.

  The ball receiving portion 10 is provided with a reduced diameter portion 15 on the back surface 12 side and a stepped portion 16 at the boundary between the reduced diameter portion 15 and the distal end side. The reduced diameter portion 15 is naturally smaller than the inner diameter of the cylindrical portion 42b of the piston portion 42, and a space is provided between the reduced diameter portion 15 and the cylindrical portion 42b.

  A biasing means 31 for biasing the stopper 40 to a position where it does not protrude is disposed within this interval. As the urging means 31, a compression spring, rubber or the like is used (hereinafter, described as “compression spring”). Each end of the compression spring 31 is in contact with the stepped portion 16 of the ball receiving portion 10 and the base portion 42 a of the piston portion 42.

  The side surface 13 of the ball receiving portion 10 is held by the case 50. The case 50 is a combination of a bottomed cylindrical case main body 51 that surrounds the back surface 12 side of the ball receiving portion 10 and a cylindrical cover portion 52 that externally fits the front surface 11 side of the ball receiving portion 10. A male screw 51a is formed on the case body 51, a female screw 52a is formed on the cover 52, and the male screw 51a and the female screw 52a are screwed together to be integrated.

  A stepped portion 17 having a slightly reduced diameter is provided on the surface 11 side of the ball receiving portion 10, and a stepped portion 52 b that overlaps the stepped portion 17 is provided on the inner surface of the cover portion 52. Further, the front end surface of the case main body 51 abuts on the step portion 16 provided at the boundary with the reduced diameter portion 15 of the ball receiving portion 10, and sandwiches the side surface 13 of the ball receiving portion 10 together with the cover portion 52.

  The inner peripheral surface of the case main body 51 is in sliding contact with the cylindrical portion 42 b of the piston portion 42 and is in contact with the O-ring 43. The case body 51 is sized such that the piston portion 42 can reciprocate between the bottom portion of the case 50 and the back surface 12 of the ball receiving portion 10. In addition, since the piston part 42 is in sliding contact with the inner peripheral surface of the case main body 51 in a larger area than the one in which the inner diameter of the cylindrical part 42b is enlarged than that in which the outer diameter is reduced, the piston part 42 stably reciprocates. .

  A sealed space T is formed in a region surrounded by the case main body 51 and the piston portion 42. A shallow spot face 51d is formed at the bottom of the case body 51 in the sealed space T.

  In addition, a fixing portion 51b attached to a bracket or the like protrudes from the bottom of the case body 51. A male screw for fastening to a female screw formed on a bracket or the like is formed on the outer peripheral surface of the fixed portion 51b, and a fluid channel 51c is formed on the central axis of the fixed portion 51b. A fluid such as air or pressurized oil (hereinafter referred to as “air”) is sent from the fluid flow path 51 c between the base portion 42 a of the piston portion 42 and the bottom portion of the case body 51, and the urging force of the compression spring 31. The piston portion 42 is moved toward the ball receiving portion 10 against the (spring force) so that the pin 41 protrudes from the apex of the main sphere 22.

  In addition, since the case 50 is separated into the case main body 51 and the cover portion 52 and covers the ball receiving portion 10, the ball receiving portion 10 can rotate in the circumferential direction. Therefore, even if three pins 41 are provided, the three pins 41 can be directed in the same direction when a plurality of ball-type support devices are juxtaposed on a bracket or the like.

  This ball-type support device is configured as described above, and the usage method will be described next.

  In this ball-type support device, air fluid is not supplied into the fluid flow path 51c in the state in which the workpiece W is conveyed, and the piston portion 42 is placed in the case by the spring force of the compression spring 31 as shown in FIG. It is biased toward the bottom of the main body 51, and the tip 41 a of the pin 41 is in a position that does not protrude beyond the apex of the main sphere 22. Therefore, the workpiece W is point-contacted on the main sphere 22 and is conveyed in a state in which almost no frictional force is generated by rolling the main sphere 22 and a large number of small spheres 21, 21,.

  And in order to stop the workpiece | work W, air is supplied in the sealed space T from the fluid flow path 51c. Then, as shown in FIG. 2 (c), the piston portion 42 moves toward the ball receiving portion 10 against the spring force of the compression spring 31, and the tip 41 a of the pin 41 protrudes beyond the apex of the main sphere 22. To do. Then, the workpiece W supported by the main ball 22 is supported by the tip 41a of the pin 41, and the workpiece W stops. At this time, since a sealed space is not formed by the pin 41 and the work W, even if dust is generated, the dust does not accumulate in the sealed space, and the stopper 41 moves toward the bottom of the case body 51. However, no dust is scattered.

  When the supply of air from the fluid flow path 51 c into the sealed space T is stopped, the piston is returned toward the bottom of the case body 51 by the spring force of the compression spring 31, and the tip 41 a of the pin 41 is connected to the main sphere 22. The position does not protrude beyond the vertex.

  Here, a workpiece transfer device in which such a ball-type support device is arranged in parallel with the transfer line of the workpiece W will be described with reference to FIGS.

  In this work transfer device, frames 62, 62 are supported on four support posts 61, 61,... Standing on the work W transfer line, and the ball-type support device (hereinafter referred to as the above-described embodiment) is supported on the frames 62, 62. , “Bottom ball-type support device on the bottom surface side.”) A bracket 63 in which a plurality of (5 in the drawing) A, A,... Are assembled is fixed, and a conveying means 70 for guiding the workpiece W is provided. ing.

  The two struts 61, 61 and the two struts 61, 61 face each other at a width that is substantially the same as the width of the workpiece W. And the frame 62 is being fixed between the support | pillars 61 and 61 standingly arranged at intervals.

  The conveying means 70 is configured around an endless belt 71 that contacts the center of the bottom surface of the workpiece W. An air cylinder (not shown) is arranged below the belt 71 through a unit (not shown), and the surface of the belt 71 is a ball-type support device A, A,. When the work W is placed, the air cylinder is pushed, and the bottom surface of the work W is supported by the main sphere 22 of the ball-type support device A, A,. The belt 71 is placed on the belt 71 to guide the workpiece W.

  Such a belt 71 travels in one direction on two pulleys 72 and 72. The pulleys 72 and 72 are attached to a shaft 64 spanned on the upstream side of the frames 62 and 62 and a shaft 64 spanned on the downstream side. The pulley 72 on the downstream side serves as a driving source, and therefore, a belt 74 that spans the rotating shaft of the motor 73 is hung on the shaft 64 to which the pulley 72 is attached.

  Two pulleys 75 and 75 for applying tension to the belt 71 are provided below the pulleys 72 and 72. The pulleys 75 and 75 are attached to shafts 65 and 65 projecting from the respective columns 61 and 61. The number of pulleys 75 to which tension is applied may be one.

  Further, as shown in FIG. 4, the bracket 63 is provided with a fluid flow path 63a connected to the fluid flow path 51c of each ball-type support device A, A,..., And a fluid intake port 63b is provided at one place. A pipe 66 is connected to the fluid intake port 63b. Air is supplied from the pipe 66 into the fluid flow path 63a.

  An upward guide member 67 is attached to each of the frames 62, 62, and the ball-type support device of the above-described embodiment (hereinafter referred to as “side-side ball-type support device”) B, A large number of B,... The ball-type support devices B and B on the side surfaces attached to the frames 62 and 62 are such that the main balls 22 and 22 face each other, and the interval between the apexes of the facing main balls 22 and 22 matches the width of the workpiece W. Has been.

  A downstream end of the workpiece transfer device is provided with a stopper 40 for stopping the transferred workpiece W and a sensor for detecting the workpiece W (both not shown).

  Here, a method for conveying the workpiece W by such a workpiece conveyance device will be described. When the work W is conveyed, air is not supplied to the fluid flow path 63a, and the pins 41 of the stoppers 40 of the ball-type support device on the bottom surface side and the side surface are not projected. Further, the belt 71 continues to travel in one direction.

  When the workpiece W is supplied to the upstream end of the workpiece transfer device, both side portions of the bottom surface of the workpiece W and the side portion of the workpiece W abut against the main ball 22 of the ball-type support device, and the center of the bottom surface of the workpiece W is reached. The part contacts the belt 71 that is moving forward. Accordingly, the workpiece W is guided by the belt 71 and conveyed downstream.

  At this time, the workpiece W is basically supported by the main ball 22 of the ball-type supporting device and does not rub against the belt 71, so that no flaws are attached and dust is hardly generated. Yes. In addition, in a work transfer device in which a large number of rollers are arranged in parallel, since each roller is not accurately arranged in parallel, it may actually meander slightly and generate dust. The ball-type support devices B, B,... On the side surface side are appropriately transported to prevent dust generation.

  When the workpiece W is transported to the downstream side, the workpiece W is stopped by the stopper. However, when the workpiece W is detected by the sensor, air flows into the fluid flow path 51c of the ball-type support device A on the bottom surface side. Is supplied. Then, the stopper 40 of the ball-type support device A on the bottom side protrudes upward, and the pin 41 pushes up the workpiece W. Therefore, the bottom surface of the work W is not rubbed by the belt 71, the work W is not wrinkled, and no dust is generated.

  When the workpiece W is continuously conveyed and the preceding workpiece W is supported, air is also supplied to the fluid flow path 51c of the ball-type support device on the bottom surface side in the middle stream or downstream, By causing the stopper 40 to protrude upward, the pin 41 supports the workpiece W. At this time, air is also supplied to the fluid flow paths 51c of the ball-side support devices B, B,... On the side surface side, and the pin 41 holds the side surface of the workpiece W by projecting the stopper 40 inward. To do. The workpiece W is stabilized by holding the side surface.

  In the clean room, an air flow (down flow) from the ceiling to the floor is generated, but even if dust is generated at the contact portion between the belt 71 and the work W, the dust does not adhere to the work W due to this air flow. Has been.

  Then, when the preceding workpiece W is discharged, the supply of air to the fluid flow paths 51c, 51c of the ball-type support devices A, B,. Then, due to the spring force of the compression springs 31, 31 of the ball-type support devices A, B, the stopper 40 becomes lower than the top of the main sphere 22, and the work W comes into contact with the main sphere 22. Then, when the belt 71 contacts the center of the bottom surface of the workpiece W, the workpiece W is conveyed.

  In addition, this invention can be variously changed without limiting to the said embodiment. For example, in the ball-type support device, the stopper 40 may be disposed outside the ball receiving portion 10. In this case, the pin insertion hole 14 is not formed in the ball receiving portion 10, and the case 50 is configured such that only the case main body 51 holds the back surface 12 side of the ball receiving portion 10.

  Further, the workpiece transfer device may be configured such that the ball-type support device A on the bottom side supports not only both sides of the workpiece but also the center. Further, the workpiece transfer device may be provided with a plurality of side-side ball-type support devices B, or conversely, may not include the side-side ball-type support device B. Further, the workpiece transfer device can be implemented even in a curved shape.

DESCRIPTION OF SYMBOLS 10 ... Ball receiving part 11 ... Front surface 11a ... Ball receiving seat 12 ... Back surface 13 ... Side face 14 ... Pin insertion hole 15 ... Reduced diameter part 21 ... Small ball 22 ... Main ball 31 ... Energizing Means (compression spring)
40 ...... Stopper 41 ... Pin 41a ... Tip 42 ... Piston 50 ... Case 70 ... Conveying means T ... Sealed space

Claims (5)

A ball receiving portion provided with a side surface between the back surface and the surface on which the concave curved ball receiving seat is formed, a large number of small balls arranged in a freely rolling manner on the ball receiving seat, and a part thereof A ball-type support device comprising one main ball that is slidably mounted on the plurality of small balls so as to protrude from the surface of the ball receiving portion,
Reciprocating between a case that holds the side surface of the ball receiving portion so as to provide a space between the back surface of the ball receiving portion and a position where the tip protrudes beyond the protruding vertex of the main sphere and a position where it does not protrude A stopper that moves and forms a sealed space with the case; an urging means that urges the stopper toward the position where it does not protrude; and the stopper against the urging force of the urging means A ball-type support device comprising: a fluid flow path for supplying a fluid for moving the fluid toward the projecting position to a sealed space between the case and the stopper. The ball receiving portion is formed with one or a plurality of pin insertion holes penetrating from the front surface to the back surface,
The stopper is inserted into the pin insertion hole, a tip projecting from the surface of the ball receiving portion, and a base end projecting from the back surface of the ball receiving portion into the sealed space; 2. The piston according to claim 1, further comprising: a piston portion that holds a base end portion of the pin and is housed in a reciprocating manner between the back surface of the ball receiving portion and the case. Ball-type bearing device as described. The piston part is composed of a flat plate-like base part and a cylindrical part protruding from the outer periphery of the base part,
The ball receiving portion is provided with a reduced diameter portion having an outer diameter smaller than the inner diameter of the cylindrical portion on the back surface side,
The ball-type support device according to claim 2, wherein the biasing means is a compression spring inserted between the cylindrical portion of the piston portion and the reduced diameter portion of the ball receiving portion. The ball-type support device according to any one of claims 1 to 3, wherein the ball-type support device is arranged in parallel so as to support at least both side portions of the bottom surface of the workpiece on the transfer line;
A workpiece conveying apparatus comprising: a conveying unit arranged to contact a bottom surface of the workpiece on the conveying line.   The ball-type support device according to any one of claims 1 to 3, wherein the ball-type support device is further provided in parallel so as to contact each side surface of the workpiece on the transfer line. The workpiece transfer device described in 1.

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