Centrifugal barrel polishing machine

Abstract

A centrifugal barrel polishing machine (100) is provided with: a turret (11) that is rotationally driven; a case (12) that is provided to the turret (11), is disposed at a position eccentric from a rotation axis (R) of the turret (11), and undergoes planetary rotation; a barrel tank (13) that is detachably fixed to the case (12); and a fixing member (12D) that is provided to the case (12) and that can move in the horizontal direction between a fixing position at which the barrel tank (13) disposed at a predetermined position with respect to the case (12) can be fixed to the case (12), and an attachment / detachment allowable position that allows attachment / detachment of the barrel tank (13) to / from the case (12).

Description

Centrifugal barrel finishing machine

[0001] The present invention relates to a centrifugal barrel finishing machine.

[0002] Patent Document 1 discloses a configuration in which a barrel tank is attached to and detached from a barrel tank case provided in a centrifugal barrel polishing machine.

[0003] International Publication No. 2012 / 042681

[0004] The technology disclosed in Patent Document 1 uses a barrel tank fixing member to fix the barrel tank to the barrel tank case. Because the centrifugal barrel polishing machine rotates the barrel tank case vigorously in a planetary motion around the rotation axis, it is necessary to reliably prevent the barrel tank from falling off the barrel tank case while the centrifugal barrel polishing machine is in operation. Therefore, it is necessary to increase the rigidity of the barrel tank fixing member to eliminate the risk of deformation or breakage of the barrel tank fixing member. In this case, the barrel tank fixing member tends to be heavy, which is undesirable because it may impose a burden on the worker handling the barrel tank fixing member.

[0005] The present invention was developed in light of the above-mentioned circumstances, and an object of the present invention is to provide a technique that can reduce the burden on an operator when operating a centrifugal barrel finishing machine.

[0006] The centrifugal barrel finishing machine of the present invention comprises: a rotatably driven turret; a case mounted on the turret and arranged eccentrically from the rotation axis of the turret to perform planetary rotation; a fixed object detachably fixed to the case; and a fixing member mounted on the case and movable horizontally between a fixing position where the fixed object, arranged at a predetermined position relative to the case, can be fixed to the case and a detachable position where the fixed object can be attached to and detached from the case.

[0007] The worker can displace the fixing member between the fixed position and the detachable position by moving the fixing member horizontally without lifting it, so the burden on the worker can be reduced even if the fixing member is a sturdy, heavy object.

[0008] 6 is a schematic diagram of a centrifugal barrel finishing machine of Example 1. It is a cross-sectional view taken along A-A in FIG. 1. It is a plan view showing a case housing a barrel tank. It is a cross-sectional view taken along B-B in FIG. 3. It is a cross-sectional view taken along C-C in FIG. 3. It is a partial side view showing a state in which a barrel tank is housed with the fixing member disposed in the detachable position. It is a cross-sectional view taken along D-D in FIG. 6. It is a partial side view showing a state in which a fixing member is disposed in the fixing position with the barrel tank housed and the set bolt is tightened. This corresponds to a partially enlarged cross-sectional view of an end portion of the fixing member in FIG. 5, showing a state in which the bottom end of the guide shaft is in contact with the bottom end of the through-hole. It is a schematic diagram of a centrifugal barrel finishing machine of Example 2. It is a plan view showing a state in which a fixing target (lid) is fixed to the case (tank body) of Example 2.

[0009] <Example 1> Example 1 embodying the present invention will be described below with reference to Figures 1 to 9. In the following description, the up-down direction is defined as the front of the page in Figure 3 as the top, and the back as the bottom. The left-right direction is defined as the left and right directions as they appear in Figure 3. The front-rear direction is a direction perpendicular to the up-down direction and the left-right direction, and the top in Figure 3 is defined as the front, and the bottom as the back.

[0010] 1 and 2, the centrifugal barrel finishing machine 100 of the first embodiment includes a pair of turrets 11, a plurality of cases 12, a plurality of fixing members 12D, and a plurality of barrel tanks 13 to be fixed thereto. The centrifugal barrel finishing machine 100 is an apparatus for polishing workpieces (not shown) in the barrel tanks 13 by planetary rotating the cases 12 housing the barrel tanks 13 about the rotation axis R of the turret 11.

[0011] [Configuration of Turrets] Each turret 11 is disk-shaped and configured to rotate integrally with a rotation axis R whose axis is oriented in the left-right direction (horizontal direction). A pair of turrets 11 are arranged spaced apart in the left-right direction. The rotation axis R extends in the left-right direction and penetrates each turret 11 in the plate thickness direction. The turret 11 and the rotation axis R are rotationally driven by a revolution motor (not shown).

[0012] 3 and 4, each case 12 has a pair of side plate portions 12A, a pair of planetary shafts P, a pair of receiving plate portions 12B, a pair of guide shafts 12C, and a plurality of magnets 12F. The case 12 is provided on the turret 11 (see FIG. 1). The pair of side plate portions 12A are arranged with their thicknesses facing the left-right direction and are spaced a predetermined distance apart in the left-right direction.

[0013] A pair of planetary shafts P protrude outward in the left-right direction from each side plate portion 12A. The pair of planetary shafts P protrude parallel to the rotation axis R (see FIG. 1). The planetary shafts P are supported so as to be rotatable relative to the turret 11 while passing through the turret 11 in the thickness direction.

[0014] The pair of receiving plates 12B extend in the left-right direction and are arranged to connect the pair of side plates 12A. The pair of receiving plates 12B are arranged so that the distance between them increases toward the upper ends (see FIG. 4). A partition plate 12E is arranged to span between the pair of receiving plates 12B (see FIG. 3). The partition plate 12E is fixed to the left-right center of each receiving plate 12B with its plate thickness oriented in the left-right direction.

[0015] The pair of guide shafts 12C have a circular cross section perpendicular to the axial direction and extend in the left-right direction. The guide shafts 12C function to guide a fixed member 12D (described later) in the left-right direction (horizontal direction). Each guide shaft 12C is made of metal and is solid. One guide shaft 12C is disposed above each receiving plate 12B (see FIG. 4). The pair of guide shafts 12C extend parallel to the pair of planetary shafts P, and both ends thereof are fixed to the respective side plate 12A. A cylindrical abutment member 12Q extending in the left-right direction is inserted and disposed in the left-right center of each guide shaft 12C (see FIG. 3). Each guide shaft 12C is fixed to the abutment member 12Q (see FIG. 7). The abutment member 12Q is fixed to the upper end of the receiving plate 12B.

[0016] A plurality of magnets 12F are attached to each side plate 12A. These magnets 12F are magnetically attracted to a fixed member 12D (described later) to maintain the position of the fixed member 12D. In each side plate 12A, the magnets 12F are arranged so that one magnet is adjacent to one guide shaft 12C. Each magnet 12F is arranged so that it is exposed on the inner side of the side plate 12A in the left-right direction. The case 12 thus formed is arranged between the pair of turrets 11 at a position eccentric to the rotation axis R (see FIGS. 1 and 2).

[0017] [Configuration of Fixing Members] Multiple fixing members 12D are provided on the case 12. In Example 1, two fixing members 12D are provided on one case 12 (see FIG. 3). The fixing members 12D are required to be magnetically attracted to the magnets 12F. For this reason, magnetic materials are used for the fixing members 12D. Furthermore, the fixing members 12D must be robust in order to secure the barrel tanks 13 (described later) to the planetary rotating case 12. For this reason, metals such as iron are used for the fixing members 12D. Each fixing member 12D extends in the front-rear direction (the up-down direction in FIG. 3). Each fixing member 12D is suspended between a pair of guide shafts 12C (see FIG. 3). The center of each fixing member 12D in the front-rear direction (the left-right direction in FIG. 4) is formed to extend horizontally in the front-rear direction, and both ends in the front-rear direction are formed to slope downward toward the guide shafts 12C.

[0018] As shown in Figure 5, each fixing member 12D has a through-hole 12G formed at both front-rear end portions thereof, penetrating in the left-right direction. A guide shaft 12C is inserted through the through-hole 12G of each fixing member 12D. Each through-hole 12G is elongated in the up-down direction. Specifically, the vertical dimension of each through-hole 12G is larger than the diameter of the guide shaft 12C. Furthermore, the width of each through-hole 12G is slightly larger than the diameter of the guide shaft 12C.

[0019] Each fixed member 12D has multiple rotating members 12H. For example, known cam followers or the like are used for the rotating members 12H. Each rotating member 12H is rotatably embedded within the fixed member 12D and arranged so as to be exposed within the through-hole 12G. Two rotating members 12H are arranged in one through-hole 12G. When viewed from the axial direction of the guide shaft 12C, the two rotating members 12H are arranged in two locations in one through-hole 12G, one on one side of the guide shaft 12C in the circumferential direction (front and rear), sandwiching the uppermost end of the guide shaft 12C therebetween, and are placed so as to contact the outer peripheral surface of the guide shaft 12C from above. This determines the relative position of the fixed member 12D with respect to the guide shaft 12C in the front-to-rear direction. In one through-hole 12G, the two rotating members 12H contact the upper half of the guide shaft 12C from above.

[0020] When viewed from above, the two rotating members 12H in each through-hole 12G are offset in the axial direction of the guide shaft 12C (see FIG. 3). When viewed from above and rearward, the central axes of the two rotating members 12H in each through-hole 12G are perpendicular to the guide shaft 12C (see FIGS. 3 and 6). In other words, the rotating members 12H are rotatable in a direction that rolls along the axial direction of the guide shaft 12C. When viewed from the axial direction of the guide shaft 12C, the central axes of the pair of rotating members 12H in each through-hole 12G are inclined downward so as to be distributed toward one side and the other side (front side and rear side) in the circumferential direction, sandwiching the uppermost end of the guide shaft 12C. When the barrel tanks 13 are not fixed to the case 12, each fixed member 12D contacts the guide shaft 12C only through the rotating members 12H (i.e., via the rotating members 12H). In other words, the portions of each fixed member 12D other than the rotating member 12H do not come into contact with the guide shaft 12C. As a result, the only resistance that occurs between the fixed member 12D and the guide shaft 12C is the rolling resistance caused by the rolling of the rotating member 12H. This allows each fixed member 12D to move smoothly along the guide shaft 12C.

[0021] As shown in Figures 3 and 4, each fixing member 12D includes a set bolt 12J, a pressure plate 12K (see Figure 4), and a cover 12P. The set bolt 12J is screwed into the center of the fixing member 12D in the front-rear direction, penetrating vertically (see Figure 4). The set bolt 12J functions to generate a pressing force for fixing the barrel tanks 13 to the case 12. The pressure plate 12K has its thickness oriented vertically and is disposed below the set bolt 12J (see Figure 4). The pressure plate 12K has a pair of pillars 12L protruding upward (see Figure 4). Each pillar 12L penetrates the fixing member 12D in the front-rear direction and is disposed on either side of the set bolt 12J in the front-rear direction (see Figure 4).

[0022] A compression coil spring 12M is inserted through each pillar 12L (see FIG. 4). The compression coil spring 12M is disposed in a compressed state between a head 12N at the upper end of each pillar 12L and the fixing member 12D. The compression coil spring 12M acts to push up the head 12N, thereby drawing the pressure plate 12K into contact with the lower end of the set bolt 12J. When the set bolt 12J is tightened in this state so as to move it downward, the pressure plate 12K is pressed downward by the set bolt 12J and moves downward.

[0023] The cover 12P is made of synthetic resin and is attached to the fixing member 12D so as to cover the top surface and the left and right side surfaces of the fixing member 12D. The cover 12P has through holes formed therethrough in the vertical direction, through which the set bolt 12J and the pair of pillars 12L can be inserted (see FIG. 3).

[0024] Each fixed member 12D is provided with a pair of abutment plates 12T (see FIG. 3). These abutment plates 12T contact both left and right end surfaces of the abutment member 12Q. In one fixed member 12D, the pair of abutment plates 12T are inserted one by one through the guide shaft 12C and attached to both front and rear end portions of the fixed member 12D. In the left fixed member 12D, the pair of abutment plates 12T are attached to the right side surface. In the right fixed member 12D, the pair of abutment plates 12T are attached to the left side surface. In other words, in a pair of fixed members 12D, the abutment plates 12T are arranged to face each other.

[0025] [Configuration of the Barrel Tank] As shown in Figures 3 and 4, the barrel tank 13 includes a tank body 13A and a lid 13B. The tank body 13A is generally shaped like a regular hexagonal cylinder with its axis oriented horizontally, and an opening 13C is formed at one end in the axial direction. The barrel tank 13 is detachably fixed to the case 12. A mass (not shown) consisting of workpieces, grinding stones, etc. can be placed inside the tank body 13A through the opening 13C. The lid 13B is formed of a flat plate having a regular hexagonal shape. The tank body 13A is provided with a fixing portion (not shown) that fixes the lid 13B with the opening 13C closed. The barrel tank 13 is thus formed.

[0026] [Example of a Method for Attaching and Detaching Barrel Tanks to the Case] ​​Next, an example of a method for attaching the barrel tanks 13 to the case 12 will be described. This description will mainly use the left half of the case 12. First, as shown in FIG. 6 , the orientation of the case 12 is adjusted so that each fixing member 12D is positioned above the case 12. At this time, the distance between the pair of receiving plates 12B increases toward the upper end. The space between the pair of receiving plates 12B is the storage space S in which the barrel tank 13 is stored (see FIG. 5 ). The distance between the upper edges of the pair of receiving plates 12B that form the storage space S is greater than the distance between the lower edges (see FIG. 5 ). Then, each fixing member 12D is moved outward in the left-right direction (toward the left in FIG. 6 ) along the guide shaft 12C until it abuts against the inner surfaces of the side plates 12A in the left-right direction (right surfaces in FIG. 6 ). At this time, each fixing member 12D is magnetically attracted to the magnet 12F attached to the side plate portion 12A, thereby holding each fixing member 12D in a state of abutting against the horizontal inner surface of each side plate portion 12A.

[0027] The position of the fixing member 12D at this time is the detachable position, which allows the barrel tanks 13 to be attached to and detached from the case 12. When the case 12 is viewed from above with the fixing member 12D in the detachable position, the fixing member 12D is positioned to the left of the housing position of the barrel tanks 13 in the case 12 (see the fixing member 12D indicated by the two-dot chain line in Figure 3). Therefore, the fixing member 12D in the detachable position does not interfere with the attachment and detachment of the barrel tanks 13 to and from the case 12. The magnet 12F is magnetically attracted to the fixing member 12D in the detachable position, holding the fixing member 12D in the detachable position. Then, the set bolt 12J is rotated in a direction displacing it upward, causing the fixing member 12D to protrude above the fixing member 12D. As a result, the pressing plate 12K is pulled upward by the compression coil spring 12M (see Figure 4).

[0028] Next, the barrel tanks 13 are housed in the case 12. Specifically, the barrel tanks 13 are housed by dropping them into the case 12 from above. In this embodiment, two barrel tanks 13 can be housed in one case 12. The opening 13C of the barrel tank 13 is closed with the lid 13B, and the lid 13B is fixed to the tank body 13A. Then, the barrel tank 13 is housed in a predetermined position in the case 12 with the axis of the tank body 13A facing the left-right direction and the lid 13B facing the partition plate 12E. When the barrel tank 13 is housed in the case 12, contact members 13D provided on two of the side surfaces of the tank body 13A come into contact with the respective receiving plates 12B (see FIG. 5 ).

[0029] Next, as shown in FIG. 8 , each fixed member 12D is moved inward in the left-right direction (to the right in FIG. 8 ). Each fixed member 12D contacts the guide shaft 12C only through the rotating member 12H (see FIG. 5 ). Therefore, the only resistance between the fixed member 12D and the guide shaft 12C is the rolling resistance that occurs when the rotating member 12H rolls while supporting the weight of the fixed member 12D. If the fixed member 12D were to shift in the front-rear direction and the inner surface of the through hole 12G were to rub against the guide shaft 12C, the sliding resistance caused by this friction would be greater than the rolling resistance. Therefore, the fixed member 12D can move smoothly along the guide shaft 12C. Furthermore, although the fixed member 12D is heavy because it is made of a metal such as iron, it does not need to be lifted against gravity when moving it, making it easy to move without placing a burden on the worker.

[0030] A pair of pins 12R protrude from the inwardly facing side of the abutment plate 12T of each fixing member 12D. Each pin 12R is positioned below the guide shaft 12C. The protruding end of each pin 12R is tapered. Furthermore, a receiving hole 12S is formed on each end surface of each abutment member 12Q in the left-right direction, recessed inwardly in the left-right direction. Each receiving hole 12S corresponds to a corresponding pin 12R. When viewed from the left-right direction, each receiving hole 12S is an elongated hole that is long in the up-down direction (see FIG. 7). The vertical dimension of each receiving hole 12S is larger than the diameter of the pin 12R. The width dimension of each receiving hole 12S is slightly larger than the diameter of the pin 12R.

[0031] When each fixing member 12D is moved inward in the left-right direction and brought close to the abutment member 12Q, each pin 12R is inserted into each receiving hole 12S. This determines the position of each fixing member 12D in the front-to-rear direction (the front and rear directions of the paper in FIG. 8 ). The abutment plate 12T of each fixing member 12D then abuts against the abutment member 12Q. The position of the fixing member 12D when the abutment plate 12T of the fixing member 12D abuts against the abutment member 12Q is a fixed position where the barrel tanks 13, which are positioned in a predetermined position relative to the case 12, can be fixed to the case 12. When the case 12 is viewed from above with the fixing member 12D in the fixed position, the fixing member 12D overlaps the barrel tanks 13 (see FIG. 3 ). Therefore, when the fixing member 12D is positioned in the fixed position, the fixing member 12D gets in the way and the barrel tanks 13 cannot be attached or detached from the case 12. The fixing member 12D is movable in the left-right direction (horizontal direction) between a fixed position and a detachable position.

[0032] Next, while holding the fixing member 12D in the fixed position, the set bolt 12J is tightened downward, causing the pressure plate 12K to be pressed downward by the set bolt 12J and come into surface contact with the support plate 13E provided on one of the side surfaces of the tank body 13A.

[0033] When the set bolt 12J is further tightened, the fixed member 12D is pulled up. At this time, the fixed member 12D is displaced upward, causing the guide shaft 12C to be relatively displaced downward within the through-hole 12G. This causes the rotating member 12H to move away from the guide shaft 12C (see FIG. 9). When the set bolt 12J is further tightened, the lowermost end of the guide shaft 12C comes into contact with the lowermost end of the inner surface of each through-hole 12G (see FIG. 9).

[0034] For example, the set bolt 12J is tightened so that the lowermost end of the guide shaft 12C is displaced downward by a predetermined rotation angle from the point where it contacts the lowermost end of the inner surface of each through-hole 12G. That is, the set bolt 12J is tightened by angle tightening. In this manner, the fixing member 12D arranged in the fixed position fixes the barrel tank 13 to the case 12. The barrel tank 13 fixed to the case 12 is pressed toward the center of the barrel tank 13 from three different directions by the pressing plate 12K of the fixing member 12D and the pair of receiving plates 12B of the case 12 (see FIG. 4).

[0035] With the barrel tank 13 fixed to the case 12, the case 12 is rotated in a planetary motion around the rotation axis R. Then, inside the tank body 13A, the mass flows and the workpieces are polished by the polishing stones.

[0036] To remove the barrel tank 13 from the case 12, loosen the set bolt 12J to separate the pressure plate 12K from the tank body 13A, and then move the fixed member 12D from the fixed position to the detachable position. Since the fixed member 12D contacts the guide shaft 12C only through the rotating member 12H unless it is displaced in the forward / backward direction, only rolling resistance occurs between the fixed member 12D and the guide shaft 12C. Therefore, the fixed member 12D can smoothly move from the fixed position to the detachable position along the guide shaft 12C. When the fixed member 12D abuts against the side plate portion 12A, it is magnetically attracted to the magnet 12F and held in the detachable position. In this way, the barrel tank 13 can be removed from the case 12.

[0037] <Operations and Effects of First Embodiment> The centrifugal barrel finishing machine 100 includes a rotatably driven turret 11, a case 12, barrel tanks 13 (fixed object), and a fixing member 12D. The case 12 is mounted on the turret 11 and rotates in a planetary fashion while being eccentric to the rotation axis R of the turret 11. The barrel tanks 13 (fixed object) are detachably fixed to the case 12. The fixing member 12D is mounted on the case 12 and is movable in the left-right direction (horizontal direction) between a fixed position where the barrel tanks 13 (fixed object) are fixed to the case 12, and a detachable position where the barrel tanks 13 (fixed object) can be attached to and detached from the case 12. This configuration allows an operator to move the fixing member 12D in the left-right direction (horizontal direction) between the fixed position and the detachable position without lifting the fixing member 12D, thereby reducing the burden on the operator even if the fixing member 12D is a sturdy and heavy object.

[0038] The fixed object is a barrel tank 13 into which workpieces can be introduced and which is housed in the case 12. A fixing member 12D arranged at a fixed position fixes the barrel tank 13 to the case 12. According to this configuration, the barrel tank 13 can be attached and detached from the case 12, making it easy to put workpieces into and take them out of the barrel tank 13.

[0039] The case 12 has a guide shaft 12C that guides the fixed member 12D in the left-right direction (horizontal direction). The fixed member 12D has a rotating member 12H that contacts the guide shaft 12C from above and rotates in the axial direction of the guide shaft 12C. The fixed member 12D contacts the guide shaft 12C via the rotating member 12H. If the fixed member 12D contacts the guide shaft 12C without the rotating member 12H, the resistance generated between the fixed member 12D and the guide shaft 12C is sliding resistance. In contrast, in this embodiment, the fixed member 12D contacts the guide shaft 12C from above via the rotating member 12H, and the weight of the fixed member 12D is supported via the rotating member 12H. Therefore, the resistance generated between the fixed member 12D and the guide shaft 12C is rolling resistance, which is smaller than sliding resistance. This allows the operator to smoothly move the heavy fixed member 12D with little force.

[0040] The rotating member 12H contacts one side and the other side of the guide shaft 12C in the circumferential direction, sandwiching the uppermost end of the guide shaft 12C from above. The rotating member 12H contacts the upper half of the guide shaft 12C from above. With this configuration, when the fixed member 12D is moved along the guide shaft 12C, it is possible to prevent the fixed member 12D from shifting in the front-to-rear direction (horizontal direction) perpendicular to the axis of the guide shaft 12C.

[0041] The case 12 has a magnet 12F that is magnetically attracted to the fixing member 12D arranged in the detachable position to hold the fixing member 12D in the detachable position. With this configuration, the fixing member 12D can be held in the detachable position by the magnet 12F, so that interference between the fixing member 12D and the barrel tanks 13 can be reliably suppressed when the barrel tanks 13 are attached to or detached from the case 12.

[0042] 10 and 11, a second embodiment of the present invention will be described. A centrifugal barrel finishing machine 200 according to the second embodiment differs from that according to the first embodiment in that a tank body 113A is mounted on a case 112, only a lid 113B is fixed, and the lid 113B is fixed to the tank body 113A with a fixing member 112D, closing an opening 113C of the tank body 113A. The same components as those in the first embodiment are designated by the same reference numerals, and a description of the structure, operation, and effect will be omitted.

[0043] As shown in FIG. 10 , the centrifugal barrel finishing machine 200 of Example 2 includes a pair of turrets 11, multiple cases 112, and multiple lids 113B to which the turrets are attached. Only one case 112 is shown in FIG. 10 . The case 112 includes a pair of side plates 12A, a tank body 113A, a pair of planetary shafts P, a pair of guide shafts 12C (see FIG. 11 ), and a fixing member 112D. The tank body 113A has a regular hexagonal cylindrical shape with its axis oriented horizontally. One of the faces of the regular hexagon has an opening 113C through which workpieces are inserted. The tank body 113A is positioned between the pair of side plates 12A with the opening 113C facing upward and is fixed to each side plate 12A.

[0044] One fixed member 112D is movable in the left-right direction between the pair of side plate portions 12A along the pair of guide shafts 12C. The fixed member 112D does not have the abutment plate 12T and pin 12R of the first embodiment. A plurality of cases 112 formed in this manner are arranged at positions eccentric from the rotation axis R between the pair of turrets 11.

[0045] The lid 113B is formed of a rectangular flat plate (see FIG. 11). The lid 113B closes the opening 113C. The lid 113B and the tank body 113A are components that make up the barrel tank 113.

[0046] [Example of a Method for Attaching a Barrel Tank to a Case] ​​Next, an example of a method for attaching the lid 113B to the case 112 will be described. First, the orientation of the case 112 is adjusted so that the fixing member 112D is positioned above the case 112. At this time, the opening 113C is positioned upward. Then, the fixing member 112D is moved leftward along the guide shaft 12C until it abuts against the left side plate portion 12A, magnetically attaching the fixing member 112D to the magnet 12F attached to the side plate portion 12A. At this time, the fixing member 112D is positioned in the detachable position (see the fixing member 112D indicated by the two-dot chain line in FIG. 11). When viewed from above, the case 112 with the fixing member 112D positioned in the detachable position is positioned to the left of the opening 113C (see FIG. 11). Therefore, the fixing member 112D positioned in the detachable position does not interfere with the attachment and detachment of the lid 113B to and from the case 112. Then, the set bolt 12J is rotated in the loosening direction to project upward from each of the fixing members 112D, and the pressing plate 12K is displaced upward.

[0047] Next, the lid 113B is placed on the tank body 113A to close the opening 113C. Then, the fixed member 112D is moved to the right. The fixed member 112D contacts the guide shaft 12C only through the rotating member 12H (see FIG. 11). Therefore, rolling resistance occurs between the fixed member 112D and the guide shaft 12C as the rotating member 12H rolls while supporting the weight of the fixed member 112D. If the fixed member 112D were to shift in the front-to-rear direction (the up-and-down direction in FIG. 11) and the inner surface of the through-hole 12G were to rub against the guide shaft 12C, the sliding resistance caused by this friction would be greater than the rolling resistance. Therefore, the fixed member 112D can move smoothly along the guide shaft 12C. The fixed member 112D is then positioned in the center of the lid 113B in the left-to-right direction. At this time, the fixed member 112D is in the fixed position. When the case 112 is viewed from above with the fixing member 112D in the fixed position, the fixing member 112D is positioned so as to overlap the lid 113B (see FIG. 11 ). Therefore, when the fixing member 112D is positioned in the fixed position, the fixing member 112D gets in the way and the lid 113B cannot be attached or detached from the case 112.

[0048] Then, with the fixing member 112D in the fixed position, the set bolt 12J is tightened, displacing the pressure plate 12K downward and bringing it into surface contact with the receiving plate 113E provided on the lid 113B from above (see FIG. 10). The set bolt 12J is then further tightened until the bottom end of the guide shaft 12C contacts the bottom end of the inner surface of each through-hole 12G (see FIG. 9), and the set bolt 12J is then further angle-tightened. The fixing member 112D thus arranged in the fixed position secures the lid 113B, with the opening 113C closed, to the tank body 113A.

[0049] To remove the lid 113B from the case 112, loosen the set bolt 12J, move the pressure plate 12K away from the lid 113B, and then move the fixed member 112D from the fixed position to the detachable position. Since the fixed member 112D contacts the guide shaft 12C only through the rotating member 12H unless it is displaced in the forward / rearward direction, only rolling resistance occurs between the fixed member 112D and the guide shaft 12C. Therefore, the fixed member 112D can smoothly move along the guide shaft 12C from the fixed position to the detachable position. When the fixed member 112D abuts against the side plate 12A, the fixed member 112D is magnetically attracted to the magnet 12F and held in the detachable position. This allows the lid 113B to be removed from the case 112.

[0050] <Functions and Effects of Second Embodiment> The centrifugal barrel finishing machine 200 includes a rotationally driven turret 11, a case 112, a lid 113B (fixed object), and a fixing member 112D. The case 112 is attached to the turret 11 and rotates in a planetary fashion while being positioned eccentrically from the rotation axis R of the turret 11. The lid 113B (fixed object) is detachably fixed to the case 112. The fixing member 112D is attached to the case 112 and is movable in the left-right direction (horizontal direction) between a fixing position where the lid 113B (fixed object) located at a predetermined position relative to the case 112 can be fixed to the case 112, and a detachable position where the lid 113B (fixed object) can be attached to and detached from the case 112. With this configuration, the worker can move the fixed member 112D left and right (horizontally) to displace it between the fixed position and the detachable position without lifting the fixed member 112D, thereby reducing the burden on the worker even if the fixed member 112D is a sturdy, heavy object.

[0051] The case 112 has a tank body 113A with an opening 113C formed therein for inserting the workpiece. The object to be fixed is a lid 113B that closes the opening 113C. The lid 113B and the tank body 113A constitute the barrel tank 113. A fixing member 112D arranged in a fixed position fixes the lid 113B, with the opening 113C closed, to the tank body 113A. With this configuration, the tank body 113A is provided in the case 112, and only the lid 113B is detached from the case 112, eliminating the need to carry the tank body 113A.

[0052] Other Embodiments The present invention is not limited to the embodiments described above and illustrated in the drawings. The following embodiments, for example, are also within the technical scope of the present invention. (1) Unlike Example 1, the cross-sectional shape of the guide shaft perpendicular to the axial direction may be polygonal. In this case, it is preferable to position one ridge at the uppermost end. (2) Unlike Example 1, the rotation axis of the turret may be set vertically, and planetary shafts extending horizontally may be arranged around the rotation axis. (3) Unlike Example 1, the rotating member may be shaped like a drum with a recess in the center of the axial direction, and the rotating member may be positioned so that its uppermost end fits into the recess in the center. Furthermore, a cylindrical rotating member with a horizontal axis may be positioned so that it contacts the uppermost end of the guide shaft. In this case, there is a concern that the fixed member may shift in the front-to-rear direction, causing friction between the inner surface of the through hole and the guide shaft. However, compared to a case where a rotating member is not provided, it is easier to move the fixed member in the direction along the guide shaft. (4) Unlike Example 1, a magnet may be provided on the fixed member. (5) Unlike Example 1, the number of barrel tanks that can be accommodated in the case may be one or three or more. (6) The multiple cases connected to the turret may be two at symmetrical positions in the circumferential direction, or three or more at equal intervals in the circumferential direction. (7) Unlike Examples 1 and 2, instead of the set bolt, an eccentric cam may be provided on the fixing member, and the fixing object may be pressed downward by rotating the eccentric cam.

[0053] 11: Turret 12, 112: Case 12C: Guide shaft 12D, 112D: Fixed member 12F: Magnet 12H: Rotating member 13: Barrel tank (fixed object) 13A: Tank body 13B: Lid 13C: Opening 100, 200: Centrifugal barrel finishing machine 113: Barrel tank 113A: Tank body 113B: Lid (fixed object) 113C: Opening R: Rotating shaft

Claims

1. A centrifugal barrel finishing machine comprising: a rotatably driven turret; a case mounted on the turret and arranged eccentrically from the rotation axis of the turret to perform planetary rotation; a fixed object detachably fixed to the case; and a fixing member mounted on the case and movable horizontally between a fixing position where the fixed object, arranged at a predetermined position relative to the case, can be fixed to the case, and a detachable position where the fixed object can be attached to and detached from the case.

2. A centrifugal barrel finishing machine as described in claim 1, wherein the object to be fixed is a barrel tank into which workpieces can be placed and which is housed in the case, and the fixing member arranged at the fixing position fixes the barrel tank to the case.

3. A centrifugal barrel finishing machine as described in claim 1, wherein the case has a tank body with an opening formed therein for inserting a workpiece, the object to be fixed is a lid that closes the opening, the lid and the tank body form a barrel tank, and the fixing member arranged at the fixing position fixes the lid to the tank body in a state where the opening is closed.

4. A centrifugal barrel finishing machine according to any one of claims 1 to 3, wherein the case has a guide shaft that guides the fixed member in a horizontal direction, the fixed member has a rotating member that contacts the guide shaft and is rotatable in a direction that rolls in the axial direction of the guide shaft, and the fixed member contacts the guide shaft via the rotating member.

5. A centrifugal barrel finishing machine according to claim 4, wherein the rotating member contacts one side and the other side of the uppermost end of the guide shaft in the circumferential direction.

6. A centrifugal barrel finishing machine as described in any one of claims 1 to 3, wherein the case has a magnet that is magnetically attached to the fixed member arranged in the detachable position to hold the fixed member in the detachable position.

Images