centrifugal barrel grinder

Abstract

In a centrifugal barrel grinder, a distance measuring sensor (15) is provided. When the barrel assembly (50) is located in the detection area, the control unit (10) determines whether the fixed distance is being measured by the distance measuring sensor (15), and if the fixed distance is not being measured, it does not allow the rotation of the turret (22).

Description

Technology Field

[0001] The present invention relates to a centrifugal barrel polishing machine. Background Technology

[0002] During the grinding process of a centrifugal barrel grinder, a large centrifugal force of approximately 10 to 40 G is applied to the barrel tank. Therefore, a fixing member prevents the barrel tank or barrel lid from falling off due to centrifugal force or vibration. Patent document 1 describes a centrifugal barrel grinder that detects, by means of a detection unit, whether the fixing member securing the barrel tank to the barrel case is in a fixed form or not, and does not allow the rotation of the turret if it is not in a fixed form. Prior art literature

[0003] [Patent Document 1] Japanese Patent Publication No. 6666960 The problem to be solved

[0004] In a configuration where the barrel jaw rotates around a rotation axis extending in the horizontal direction, there are cases where the barrel jaw deviates from the angle assumed around the rotation axis when determining whether the fixed member is in a fixed state or not. In such cases, there is a concern that the fixed member may be misjudged as being in a fixed state based on the detection result by the detection unit, even when the fixed member is not in a fixed state.

[0005] The present invention has been made in light of the above problem and aims to provide a centrifugal barrel grinder having a fixing member for fixing a barrel or a barrel lid, wherein the centrifugal barrel grinding is suppressed from starting when the fixing member is not in a fixed form. means of solving the problem

[0006] In order to solve the above problem, the centrifugal barrel grinder disclosed in the present embodiment comprises: a turret that is driven to rotate around an orbital axis extending in a horizontal direction; a barrel case that is driven to rotate around a rotational axis extending in a horizontal direction at a position eccentric from the orbital axis in the turret; a barrel assembly that is accommodated in the barrel case; a fixing member that changes between a fixing form that fixes the barrel assembly to the barrel case and a releasing form that releases the fixing of the barrel assembly to the barrel case; a distance measuring unit and a control unit that are positioned in a measurement direction according to the approximate horizontal direction with respect to a detection area located on the orbital path of the barrel assembly centered on the orbital axis. The fixed member has a measuring part whose position is displaced between a fixed form and an unlocked form, and when the measuring part changes from the fixed form to the unlocked form, it is displaced from the measurement direction of the distance measuring part in a direction intersecting the measurement direction, and the control unit determines whether the fixed distance, which indicates the horizontal distance to the measuring part by the distance measuring part, is being measured when the barrel assembly is located in the detection area, and if the fixed distance is not being measured, the rotation of the turret is not permitted.

[0007] In the above configuration, when the barrel assembly is located in the detection area, the control unit determines whether the fixed member is in a fixed position or not by using the distance measured by the distance measuring unit. If the fixed position distance, which indicates the horizontal distance to the part to be measured, is not measured by the distance measuring unit, rotation of the turret is not permitted. By doing so, it is possible to prevent centrifugal barrel grinding from starting when the fixed member is not in a fixed position. Effects of the invention

[0008] According to the present invention, in a centrifugal barrel grinder, it is possible to prevent centrifugal barrel grinding from starting when the fixed member is not in a fixed form. Brief explanation of the drawing

[0009] [Fig. 1] This is a diagram of the configuration of a centrifugal barrel grinder. [Fig. 2] This is a diagram showing the interior of Fig. 1 as seen through arrow A, enlarged. [Fig. 3] This is a diagram illustrating a fixed member. [Fig. 4] This is a diagram illustrating a fixed member. [Fig. 5] This is a flowchart explaining the sequence of processes executed by the control unit during operation. [Fig. 6] This is a diagram explaining the determination of the fixed form of a fixed member. [Fig. 7] This is a diagram explaining the determination of the fixed form of a fixed member. [Fig. 8] This is a figure illustrating the determination of the fixed form of the fixed member in the comparative example. [Fig. 9] This is a diagram of the configuration of a centrifugal barrel grinder according to the second embodiment. [Fig. 10] This is a diagram showing the interior of Fig. 9 as seen through arrow B, enlarged. [Fig. 11] This is a diagram illustrating a fixed member. [Fig. 12] This is a diagram illustrating a fixed member. [Fig. 13] This is a diagram of the configuration of a centrifugal barrel grinder according to the third embodiment. Specific details for implementing the invention

[0010] (First embodiment)

[0011] A centrifugal barrel polisher according to the present embodiment will be described with reference to the drawings. A centrifugal barrel polisher is a device capable of performing centrifugal barrel polishing on a workpiece that is to be polished. The centrifugal barrel polisher (100) shown in FIGS. 1 and 2 mainly comprises a housing (90), a barrel mechanism (20), a control unit (10) that controls the operation of the barrel mechanism (20), an area detection sensor (14), and a distance measuring sensor (15).

[0012] The control unit (10) may be placed outside the housing (90). Although the description is omitted, the centrifugal barrel grinder (100) is connected to a power source, and power from this power source is supplied to the control unit (10) and the barrel mechanism (20) through a power circuit not shown.

[0013] In this embodiment, when the centrifugal barrel grinder is installed on an installation surface indoors, such as in a factory, the height of the centrifugal barrel grinder is set to the vertical direction D3, and the direction horizontal to the installation surface is defined as the horizontal direction (a direction including the first direction D1 and the second direction D2 described below). Furthermore, the horizontal direction is also a direction that intersects the vertical direction D3. The horizontal direction is not strictly limited to being parallel to the installation surface; it may be inclined at a predetermined angle relative to the installation surface. Therefore, the concept of the horizontal direction includes being "approximately horizontal" relative to the installation surface.

[0014] First, the configuration of the barrel mechanism (20) is explained. The barrel mechanism (20) mainly comprises an orbital axis (21), a turret (22), a motor (24), a rotational axis (23), a barrel case (40), a barrel assembly (50), and a fixed member (60).

[0015] The orbiting shaft (21) is mounted inside the centrifugal barrel grinder (100) with the direction in which the shaft extends facing the horizontal direction. In this embodiment, the orbiting shaft (21) is mounted rotatably within the housing (90) while being supported by a bearing.

[0016] On the orbital axis (21), two turrets (22) are rotatably mounted integrally with the orbital axis (21) in the direction in which the orbital axis (21) extends. The turrets (22) are members that spread out in a radial shape with respect to the central part through which the orbital axis (21) passes. Specifically, the turrets (22) are disc-shaped members centered on the central part where the orbital axis (21) is located, and have an inner surface (22A) and an outer surface (22B) facing in the opposite direction to the inner surface (22A). The two turrets (22) are maintained within the housing (90) so as to be rotatably mounted by the orbital axis (21) while facing each other's inner surfaces (22A).

[0017] Between the two turrets (22), a rotation axis (23) is mounted so as to be rotatable relative to the turret (22) while being supported by a bearing member fixed to the turret (22). The rotation axis (23) is mounted at a position eccentric by a predetermined distance from the rotation center of the turret (22) (hereinafter also referred to as the eccentric position), with the direction in which the axis extends facing the horizontal direction. Specifically, the rotation axis (23) is mounted at an eccentric position eccentric by a predetermined distance (i.e., on the radius of the orbital path R) from the orbital center where the orbital axis (21) is located in the turret (22).

[0018] Between the two turrets (22), a barrel case (40) is rotatably mounted integrally with the axis of rotation (23). The barrel case (40) has a space inside capable of accommodating a barrel assembly (50). In this embodiment, four barrel cases (40) are mounted on the turret (22) so as to rotate around four axes of rotation (23). The number of barrel cases (40) mounted on the turret (22) is not limited to four, and may be less than four or more than four. Details regarding the shape of the barrel case (40) will be described later.

[0019] The barrel assembly (50) is a member having a mass receiving space, which is a space in which a workpiece and a grinding stone are received. Mass is a term used to represent the workpiece and the grinding stone as a single unit. The size of the barrel assembly (50) is smaller than the size of the receiving space of the barrel case (40). The fixing member (60) is a member that fixes the barrel assembly (50) received in the barrel case (40) to the barrel case (40). The detailed shapes of the barrel assembly (50) and the fixing member (60) will be described later. Hereinafter, the direction in which the orbital axis (21) and the rotational axis (23) extend in the horizontal direction is defined as the first direction D1, and the direction perpendicular to the first direction in the horizontal direction is defined as the second direction D2.

[0020] The motor (24) is a driving source for rotating the turret (22) and the barrel case (40). The output shaft of the motor (24) is equipped with a driving pulley (25). The orbiting shaft (21) is equipped with a driven pulley (27). The driven pulley (27) is connected to the driving pulley (25) via an orbiting belt (26). The rotation of the output shaft of the motor (24) is transmitted to the driven pulley (27) via the orbiting belt (26) and can rotate the orbiting shaft (21).

[0021] On the side opposite to where the driven pulley (27) is connected in the first direction D1, a main timing pulley (28) is fixed to the housing (90) via a rotating fixing member (31). The main timing pulley (28) is rotatably supported by an orbiting shaft (21) through a bearing inserted into an inner hole. Additionally, a rotating timing pulley (29) is mounted on the rotational shaft (23). The rotating timing pulley (29) is connected to the main timing pulley (28) via a timing belt (30). As the rotation of the orbiting shaft (21) occurs, the turret (22) and the barrel case (40) mounted on the turret (22) rotate (orbit) in the same direction. At this time, since the rotational timing pulley (29) mounted on the rotation axis (23) is connected to the main timing pulley (28), which is a non-rotating body, via a timing belt (30), the rotation axis (23) rotates in the opposite direction to the rotation direction of the turret (22) in conjunction with the rotation (revolution) of the turret (22). By this, the rotation axis (23) and the barrel case (40) can be rotated relative to the turret (22).

[0022] Since the main timing pulley (28) is connected to the rotation axis (23) via the rotation timing pulley (29) and the timing belt (30), slippage caused by the rotation mechanism of the rotation axis (23) can be suppressed, and the angle of the barrel assembly (50) located in the detection area (80) described later can be suppressed. In this embodiment, the main timing pulley (28), the rotation timing pulley (29), and the timing belt (30) are examples of the rotation mechanism. Additionally, a gear or a chain may be used instead of the timing belt (30).

[0023] Next, the configuration of the control unit (10) will be described. As shown in FIG. 1, the control unit (10) has a control panel (11), a sequencer (12), and a driving circuit (13).

[0024] The sequencer (12) is a programmable controller that stores a predetermined program in memory. The sequencer (12) receives signals according to the operating conditions of the centrifugal barrel grinder (100) from the control panel (11). The operating conditions that can be set by operating the control panel (11) are, for example, the rotational speed of the turret (22) and the barrel case (40), or the grinding time indicating the time for centrifugally grinding the workpiece.

[0025] The output from the sequencer (12) is input to the driving circuit (13). The driving circuit (13) outputs a driving signal to control the rotational speed of the motor (24) and the polishing time according to a signal corresponding to the operating condition input from the sequencer (12).

[0026] The area detection sensor (14) is a sensor that detects whether the barrel assembly (50) is located in a detection area (80), which is a predetermined area within the housing (90). The detection area (80) is an area located on the orbital path R of the barrel case (40), and in this embodiment, as shown in FIG. 2, it is an area that includes the highest position in the vertical direction D3 on the orbital path R. On the perimeter of the turret (22), detection dogs (16) are mounted every 90 degrees according to the position of the barrel case (40). The area detection sensor (14) is mounted so as to detect the detection dog (16) located at the center in the vertical direction D3. As shown in FIG. 2, when the area detection sensor (14) detects the detection dog (16), the barrel assembly (50) (barrel case (40)) corresponding to a position rotated 90 degrees to the left from the detection dog (16) is located in the detection area (80). The area detection sensor (14) is connected to the control unit (10), and when it detects that the barrel case (40) is located in the detection area (80), it outputs a detection signal to the control unit (10).

[0027] The distance measuring sensor (15) is a sensor that monitors whether the fixed member (60) is in a fixed form or not. The distance measuring sensor (15) is a sensor that measures the distance to an object by irradiating a measuring light along the measurement direction and receiving the measuring light reflected from an object located in the measurement direction. The distance measuring sensor (15) is connected to the control unit (10) and outputs distance information based on the measuring light reflected from the object to the control unit (10). In this embodiment, the distance measuring sensor (15) is an example of a distance measuring unit.

[0028] In this embodiment, the distance measuring sensor (15) is mounted on the outer side of the turret (22) on the outer surface (22B) in the first direction D1, which is the direction in which the orbital axis (21) extends. More specifically, the distance measuring sensor (15) is mounted in the housing (90) with the detection direction facing the detection area (80) and the direction in which the measurement light is irradiated facing approximately parallel to the first direction D1.

[0029] Next, the detailed configuration of the barrel case (40), barrel chamber (50), and fixed member (60) will be described. The barrel case (40) is a container with an open top and a water storage space inside capable of accommodating the barrel chamber (50). The barrel case (40) has a bottom wall, a pair of opposing walls extending from both edges of the first direction D1 of the bottom wall, and a pair of side walls extending from both ends of the second direction D2 of the bottom wall. The space enclosed by the pair of opposing walls and the pair of side walls becomes the water storage space. A rotation axis (23) is fixed to each opposing wall in the barrel case (40), and the barrel case (40) is configured to rotate integrally with this rotation axis (23).

[0030] A pair of side plates (45) are mounted on the upper part of the barrel case (40) and on both ends of the first direction D1. The side plates (45) are plate-shaped members having a polygonal flat surface. Specifically, the side plates (45) have a cut-out portion (46) in which one of the corner portions of the flat surface is cut out, and a positioning hole (47) that penetrates the flat surface and is mounted with a fixing member (clamp lever (61)) described later. The side plates (45) are each mounted on the opposite wall of the barrel case (40) while facing the flat surface in the first direction D1.

[0031] The barrel assembly (50) has a barrel body (51) and a barrel lid (52). The barrel body (51) is a container having an opening on its upper surface and a mass receiving space inside capable of receiving a mass (workpieces and grinding stones, etc.). The barrel lid (52) is a member that blocks the opening of the barrel body (51).

[0032] The fixing member (60) is a member that changes between a fixing form that fixes the barrel assembly (50) to the barrel case (40) and a releasing form that releases the fixing of the barrel assembly (50) to the barrel case (40). As shown in FIGS. 3 and 4, the fixing member (60) has a clamp lever (61) and a lever fixing part (70).

[0033] The clamp lever (61) is a member that is rotatably mounted on the side plate (45) of the barrel case (40). The clamp lever (61) mainly comprises a main body shaft portion (62), a lever (63) protruding outward from the main body shaft portion (62), and a measuring dog (64). Both ends of the main body shaft portion (62) have insertion portions (65, 66) with a diameter smaller than that of the main body shaft portion (62). The measuring dog (64) is a bracket-shaped portion protruding outward from the main body shaft portion (62) and has a measuring side surface (64A) facing in the direction in which the shaft extends.

[0034] The lever fixing part (70) is a member that fixes the clamp lever (61) in a state that restricts rotation relative to the barrel case (40). The lever fixing part (70) has a fixing pin (71), three guide parts (72, 73, 74) that guide the fixing pin (71), and a spring (75) that attaches the fixing pin (71) to a fixed position. The three guide parts (72, 73, 74) are fixed in a state where they are aligned in the same direction on the barrel lid (52). Of the three guide parts (72, 73, 74), two guide parts (72, 73) have through holes that guide the slide of the fixing pin (71). Between the guide section (72) and the guide section (73), a spring (75) is positioned so that it is penetrated by a fixing pin (71) and also restricted by a stopper member (77). The spring (75) applies an elastic pressure to the tip of the fixing pin (71) opposite to the knob (76) to the guide section (74).

[0035] When fixing the barrel assembly (50) to the barrel case (40) by means of a fixing member (60), first, the barrel assembly (50) is accommodated in the auxiliary space of the barrel case (40) while the opening of the barrel body (51) is covered by the barrel lid (52). Next, as shown in FIG. 4, one insertion part (65) of the clamp lever (61) is inserted into the positioning hole (47) of one side plate (45), and then the other insertion part (66) is inserted into the positioning hole (47) of the other side plate (45). With respect to the fixing pin (71), the knob (76) is pulled so that its tip slides toward the guide part (73) rather than the guide part (74). In this state, the lever (63) of the clamp lever (61) is positioned between the guide parts (73, 74).

[0036] By releasing the pulling of the fixing pin (71), the tip of the fixing pin (71) is brought into contact with the guide portion (74) by the elastic pressure from the spring (75). Since the portion between the guide portions (73, 74) of the fixing pin (71) is positioned above the lever (63), the rotation of the clamp lever (61) relative to the side plate (45) is restricted. The barrel assembly (50) is fixed to the barrel case (40) by the clamp lever (61).

[0037] Next, the sequence of processing performed by the control unit (10) during the operation of the centrifugal barrel grinder (100) is explained using FIG. 5. By operating the start button by the operator, the control unit (10) rotates the turret (22) at a low speed in step 11. The rotational speed of the motor (24) set in S11 is a speed determined as the speed when determining the fixed form of the fixed member (60), and is slower than the rotational speed set as the operating condition during grinding. Hereinafter, the step is also referred to as "S".

[0038] The control unit (10) outputs a detection signal from the area detection sensor (14) to the control unit (10) by the low-speed rotation of the turret (22). At S12, the control unit (10) determines whether or not a barrel assembly (50) (barrel case (40)) is located within the detection area (80). Specifically, the control unit (10) determines that one of the barrel assemblies (50) is located within the detection area (80) when the area detection sensor (14) detects a detection dog (16) fixed to the turret (22).

[0039] The control unit (10) waits if it determines that the barrel case (40) is not located within the detection area (80) (S12: NO). Meanwhile, if the control unit (10) determines that the barrel case (40) is located within the detection area (80) (S12: YES), it proceeds to S13. In S13, the control unit (10) determines the distance information output from the distance measuring sensor (15).

[0040] FIG. 6 illustrates the relationship between a fixed member (60) and a distance measuring sensor (15) when the fixed member (60) is in a fixed form in a barrel assembly (50) located in a detection area (80). In this example, there is no difference in the angle of the barrel assembly (50) within the detection area (80).

[0041] When the fixed member (60) is in a fixed form, as shown in FIG. 6(a), the lever (63) of the clamp lever (61) is pressed down toward the barrel assembly (50). Because of this, the measuring side (64A) of the measuring dog (64) of the clamp lever (61) is located on the side of the cut-out portion (46) in the second direction D2 with respect to the side plate (45).

[0042] As shown in FIG. 6(b), when the fixed member (60) is in a fixed form, the measuring side (64A) of the measuring dog (64) is positioned in the measuring direction of the distance measuring sensor (15) (i.e., on the trajectory of the measuring light), so that the distance measuring sensor (15) measures the fixed distance, which is the horizontal distance to the measuring side (64A). The “fixed distance” is the distance assumed when the barrel assembly (50) is located in the detection area (80) and the fixed member (60) is in a fixed form. Specifically, the fixed distance is a value having an error range of several [mm] on the positive side and the negative side, respectively, with respect to the reference value.

[0043] In the following, when a fixed member (60) in a fixed form is located in a detection area (80), the position where the trajectory of the measurement light from the distance measurement sensor (15) intersects the side surface (64A) is defined as the first position P. Additionally, a predetermined range AR that spreads orthogonally from the first position P is defined on the trajectory of the measurement light from the distance measurement sensor (15). In this embodiment, in the detection area (80), there is no object capable of reflecting the measurement light other than the side surface (64A) on the predetermined range AR that spreads orthogonally from the first position P.

[0044] The control unit (10) determines that the fixed member (60) is in a fixed form if, in S13, the distance information obtained from the distance measuring sensor (15) falls within an error range with respect to the reference value of the fixed distance. Meanwhile, the control unit (10) determines that the fixed member (60) is not in a fixed form if the distance information obtained by the distance measuring sensor (15) does not fall within an error range with respect to the reference value of the fixed distance.

[0045] In this embodiment, the control unit (10) stops the rotation of the turret (22) when distance information is obtained by the distance measuring sensor (15) at S13. In addition, if the low-speed rotation speed of the turret (22) at S11 is sufficiently low, the control unit (10) may continue the rotation of the turret (22).

[0046] When the control unit (10) initiates the first processing in S13, it starts counting by a timer not shown. The counting by the timer takes into account the rotation speed of the turret (22) and sets the time required for the turret (22) to rotate once.

[0047] The control unit (10) determines in S14 whether the fixed member (60) has measured the fixed distance four times (equal to the number of barrel cases (40)). If the number of times the fixed distance has been measured in S14 is less than four times (S14: NO), the control unit (10) proceeds to S15 and determines whether the timer count has ended. If the control unit (10) determines that the timer count has not ended (i.e., the turret (22) has not rotated once) (S15: NO), it returns to S12 and determines whether the next barrel group (50) is located in the detection area (80) by the area detection sensor (14). Then, if the control unit (10) determines that a new barrel group (50) is located in the detection area (80) (S12: YES), it executes the processing of S13 and S14.

[0048] As the detection of the area detection sensor (14) and the determination of distance information are repeated, if the control unit (10) determines that the fixed distance has been measured four times (S14: YES), it proceeds to S16. In S16, the control unit (10) does not stop the turret (22) and starts the rotation of the turret (22) under operating conditions (i.e., high-speed rotation).

[0049] When the turret (22) is switched to a high-speed rotation state, the control unit (10) proceeds to a barrel polishing process. The control unit (10) counts the polishing time at S17. When the polishing time has elapsed (S17: YES), the control unit (10) stops the high-speed rotation of the turret (22) at S18 and terminates the barrel polishing process.

[0050] Meanwhile, if the distance measuring sensor (15) does not measure the fixed distance from any one of the four fixed members (60) until one rotation in the turret (22) is completed, the control unit (10) cannot determine that the fixed distance has been measured four times in S14 (S14: NO). FIG. 7 shows the relationship between the fixed member (60) and the distance measuring sensor (15) when the fixed member (60) is not in a fixed form in the barrel assembly (50) located in the detection area (80). In FIG. 7(a), the lever (63) of the clamp lever (61) is pushed up from the barrel assembly (50). In this example, the measuring side (64A) of the measuring dog (64) of the clamp lever (61) is located on the upper side in the vertical direction D3 with respect to the side plate (45). That is, the side surface (64A) is displaced in the vertical direction D3 that intersects the measurement direction of the distance measuring sensor (15) as the fixed member (60) changes from a fixed form to a released form.

[0051] As shown in FIG. 7(b), the measuring side (64A) of the measuring dog (64) is not located on the trajectory of the measuring light from the distance measuring sensor (15), and the distance measuring sensor (15) does not measure the fixed distance. As described above, if the fixed member (60) is not in a fixed form, the object is not located on the predetermined range AR that spreads orthogonally from the first position P on the trajectory of the measuring light. In this example, the distance to a part located at a different position from the first position P on the trajectory of the measuring light from the distance measuring sensor (15) (for example, a housing (90) located further from the distance measuring sensor (15) than the first position P) is measured.

[0052] In the centrifugal barrel grinder (100), it is assumed that the barrel assembly (50) located in the detection area (80) is tilted more than the angle assumed around the axis of rotation (23) due to slippage caused by the mechanism transmitting rotational driving force from the motor (24). FIG. 8 shows a comparative example in which, regarding the barrel assembly (50) located in the detection area (80), whether the fixed member (60) is in a fixed form or not is detected by the presence or absence of a measuring dog (64). That is, in the example shown in FIG. 8, unlike the present embodiment, the distance to the fixed member (60) is not measured. Also, in FIG. 8, the barrel assembly (50) is tilted more than the angle assumed around the axis of rotation (23) in the detection area (80).

[0053] In FIG. 8(a), the lever (63) is positioned on the trajectory of the sensor's detection light because the barrel assembly (50) is tilted at an angle greater than the angle assumed around the axis of rotation (23). In other words, the lever (63) is positioned on the trajectory of the detection light, but is positioned at a different location from the first position P on the trajectory. Therefore, in this comparative example, the sensor detects the lever (63) and misjudges that the fixed member (60) is in a fixed form.

[0054] Also, in FIG. 8(b), the clamp lever (61) of the fixed member (60) is not fixed to the side plate (45). In FIG. 8(b) as well, the side plate (45) is positioned on the trajectory of the sensor's detection light. In other words, the side plate (45) is positioned on the trajectory of the detection light, but is positioned at a different location from the first position P on the trajectory. Therefore, in this comparative example, the sensor detects the side plate (45), and thus misjudges that the fixed member (60) is in a fixed state.

[0055] Regarding this, in the present embodiment, since the distance is measured with respect to the fixed member (60) by the distance measuring sensor (15), in either case of FIG. 8(a) or FIG. 8(b), the lever (63) or the side plate (45) is on the trajectory of the measuring light but is not located at the first position P, and the distance measuring sensor (15) measures a distance different from the fixed distance. In particular, in the detection area (80), no object other than the measuring dog (64) is located on the predetermined range AR that spreads orthogonally from the first position P. Therefore, the control unit (10) can determine that the fixed member (60) is not in a fixed form. In addition, even if the fixed member (60) is in a fixed form, if the barrel assembly (50) is tilted at an angle greater than the angle assumed around the axis of rotation (23), the distance measuring sensor (15) does not measure the fixed distance (S14: NO), and the control unit (10) does not allow the rotation of the turret (22). In this case, the control unit (10) safely operates the centrifugal barrel grinder by not rotating the turret (22).

[0056] Returning to FIG. 5, if the control unit (10) determines that S14 is negative, it proceeds to S15. If the control unit (10) determines that the count of one rotation time of the turret (22) has been measured (S15: YES), it proceeds to S18. At S18, the control unit (10) stops the rotation of the turret (22) without proceeding to the barrel polishing process and terminates the processing of FIG. 5.

[0057] In the embodiment described above, the following effects may be produced.

[0058] The control unit (10) determines whether the fixed member (60) is in a fixed position by using the distance measured by the distance measuring sensor (15) when the barrel assembly (50) is located in the detection area (80). If the fixed position distance is not measured by the distance measuring sensor (15), rotation of the turret (22) is not permitted. By this, when the fixed member (60) is not in a fixed position, rotation of the turret (22) is not permitted in a situation where the barrel assembly (50) is tilted more than the angle assumed around the axis of rotation (23) within the detection area (80), and the horizontal distance to the measuring dog (64) cannot be measured. As a result, centrifugal barrel grinding can be prevented from starting when the fixed member (60) is not in a fixed position.

[0059] When the barrel assembly (50) is located in the detection area (80), the detection area (80) has only a measuring dog (64) as an object capable of reflecting light at the first position P (fixed viewing distance). In the above configuration, since there is no object capable of reflecting measuring light other than the measuring dog (64) at the first position P of the detection area (80), the effect of suppressing a fixed type of misjudgment can be enhanced.

[0060] The distance measuring sensor (15) is mounted on the outer side (22B) opposite to the inner side (22A) where the barrel case of the turret (22) is mounted in the first direction D1. By doing so, even during the operation of the centrifugal barrel grinder (100), water droplets that are unintentionally scattered from the barrel (50) are prevented by the turret (22) and are difficult to attach to the distance measuring sensor (15). As a result, it is possible to suppress the occurrence of measurement failures caused by water droplets blocking the emission or reception of the measuring light.

[0061] By connecting the main timing pulley (28) to the rotation axis (23) via the rotation timing pulley (29) and the timing belt (30), slippage caused by the rotation mechanism of the rotation axis (23) can be suppressed, and the angle of the barrel assembly (50) located in the detection area (80) can be suppressed. As a result, the distance measuring sensor (15) can be prevented from measuring the fixed distance, and the centrifugal barrel grinder (100) can be operated stably.

[0062] (Second embodiment)

[0063] In the second embodiment, configurations different from the first embodiment are mainly described. In the second embodiment, the same reference numerals are assigned to parts identical to those in the first embodiment, and their descriptions are not repeated.

[0064] FIG. 9 is a diagram illustrating the configuration of a centrifugal barrel grinder (100) according to the present embodiment. FIG. 10 is a diagram showing an enlarged view of the interior of FIG. 9 as seen through arrow B. In the present embodiment as well, the barrel assembly (50) is fixed by a fixing member (60) while being housed in the barrel case (40). The fixing member (60) is mounted to the barrel case (40) through a side plate (45). Meanwhile, in the present embodiment, compared to the first embodiment, the shape of the barrel assembly (50) is different, and the shape of the fixing member (60) is also different to match the shape of the barrel assembly (50).

[0065] The barrel assembly (50) has an opening formed on one side of the length direction (in FIG. 9, the first direction D1) of the barrel body (51) into which a mass can be inserted. The barrel lid (52) is mounted on the barrel body (51) to cover the opening of the barrel body (51). Accordingly, the barrel assembly (50) is accommodated in the water supply space of the barrel case (40) with the barrel lid (52) positioned on one side of the first direction D1 (right side in FIG. 9).

[0066] FIG. 11 is a diagram illustrating a fixing member (60) according to the present embodiment. In the present embodiment, the fixing member (60) comprises a main body plate (160), a screw portion (161), and a hydraulic portion (164). The main body plate (160) is a plate-shaped member, and its lengthwise dimension is larger than the dimension between the side plates (45) of the barrel case (40). On the flat surface of the main body plate (160) in the upper direction, a female screw is formed along the thickness direction. The screw portion (161) is a member that engages with the female screw of the main body plate (160) and has a engagement portion at its tip that can engage with a wrench. The hydraulic portion (164) is fixed to the barrel body (51) of the barrel assembly (50).

[0067] In this embodiment, when the barrel assembly (50) is fixed to the barrel case (40) by means of a fixing member (60), first, the barrel lid (52) is fixed in a state covering the opening of the barrel body (51). Then, the barrel assembly (50) is accommodated in the water storage space of the barrel case (40). Next, as shown in FIG. 11, one insertion part (162) of the main body plate (160) is inserted into the positioning hole (47) of the side plate (45), and then the other insertion part (163) is inserted into the positioning hole (47) of the other side plate (45). By rotating the screw part (161) in the fastening direction with a wrench not shown, the end of the screw part (161) facing the hydraulic part (164) is brought into contact with the hydraulic part (164).

[0068] In this embodiment, one of the insertion portions (163) of the main body plate (160) is used as the part to be measured. In the state shown in FIG. 11, the insertion portion (163) is not located on the optical axis of the measurement light from the distance measuring sensor (15).

[0069] When the tip of the screw portion (161) is in contact with the hydraulic portion (164) and the screw portion (161) continues to rotate in the fastening direction, as shown in FIG. 12, the main body plate (160) is displaced upward and the insertion portion (163) is also displaced upward. As a result, the part inserted into the positioning hole (47) of the main body plate (160) and the inner circumference of the positioning hole (47) come into contact on the upward side, and the screw portion (161) applies downward pressure to the hydraulic portion (164).

[0070] In the state shown in FIG. 12, the insertion part (163) is located on the trajectory of the measurement light from the distance measurement sensor (15). When the fixed member (60) in a fixed form is located in the detection area (80), the position that intersects the insertion part (163) of the main body plate (160) on the trajectory of the measurement light from the distance measurement sensor (15) is designated as the first position P. In this embodiment as well, in the detection area (80), there is no object capable of reflecting the measurement light other than the insertion part (163) of the main body plate (160) on the predetermined range AR that spreads orthogonally to this first position P.

[0071] In the embodiment described above, the same effect as in the first embodiment can be produced.

[0072] (Third embodiment)

[0073] In the third embodiment, the description primarily focuses on configurations different from the first embodiment. In the third embodiment, the same reference numerals are used for locations identical to those in the first embodiment, and their descriptions are not repeated.

[0074] FIG. 13 is a diagram illustrating a barrel mechanism (20) according to the present embodiment. In the present embodiment as well, the fixing member (60) has a clamp lever (61) and a lever fixing part (70). The configuration of the clamp lever (61) and the lever fixing part (70) has already been explained using FIG. 3 and FIG. 4. Meanwhile, in the present embodiment, compared to the first embodiment, the barrel mechanism (20) does not have a barrel case, and the barrel assembly (50) is fixed so as to be rotatable integrally with the rotation axis (23). Also, a pair of side plates (45) are directly mounted on the barrel body (51) of the barrel assembly (50).

[0075] In this embodiment, the barrel lid (52) is fixed to the barrel body (51) by mounting the fixing member (60) to the side plate (45) mounted on the barrel body (51). Additionally, the method of fixing the barrel lid (52) to the barrel body (51) by the fixing member (60) has already been explained using FIG. 4.

[0076] In the above-described embodiment, the same effect as the present invention can be produced even in a configuration where the centrifugal barrel grinder (100) does not have a barrel case.

[0077] (Other embodiments)

[0078] The technology disclosed in this specification is not limited to the embodiments described above, and can be modified in various forms without departing from the gist thereof, and, for example, the following modifications are possible.

[0079] In the above-described embodiment, the centrifugal barrel grinder (100) rotates the orbital axis (21) and the rotational axis (23) respectively by a single motor (24). Alternatively, the centrifugal barrel grinder (100) may separately provide a motor for rotating the orbital axis (21) and a motor for rotating the rotational axis (23).

[0080] In the above-described embodiment, the bottom surface of the barrel case (40) is at a horizontal angle (i.e., parallel to the first direction D1 and the second direction D2), but it is acceptable for the bottom surface of the barrel case (40) to be tilted at only a predetermined angle. Explanation of the symbols

[0081] 10… Control unit, 15… Distance measuring sensor, 21… Orbital axis, 22… Turret, 23… Rotation axis, 40… Barrel case, 50… Barrel jaw, 60… Fixing member

Claims

Claim 1 A turret that is driven by rotation around an orbital axis extending in a horizontal direction; a barrel case that is driven by rotation around a rotational axis extending in a horizontal direction at an eccentric position from the orbital axis in the turret; a barrel assembly housed in the barrel case; a fixing member that changes between a fixed form that fixes the barrel assembly to the barrel case and a release form that releases the fixation of the barrel assembly to the barrel case; a distance measuring unit positioned toward a measurement direction in the horizontal direction with respect to a detection area located on the orbital path of the barrel assembly centered on the orbital axis; and a control unit. The fixing member has a part to be measured whose position is displaced between the fixed form and the release form. When changing from the fixed form to the release form, the part to be measured is displaced from the measurement direction of the distance measuring unit in a direction intersecting the measurement direction. The control unit determines whether or not a fixed distance, which represents the horizontal distance to the part to be measured by the distance measuring unit, is being measured when the barrel assembly is located in the detection area. A centrifugal barrel grinder characterized by controlling the rotation of the turret so as not to allow it if the above fixed distance is not measured, and the distance measuring unit measuring the horizontal distance from the distance measuring unit to the position where the trajectory of the measuring light of the distance measuring unit intersects the side surface of the measured part as the above fixed distance. Claim 2 A barrel assembly having a turret that is driven by rotation around an orbital axis extending in a horizontal direction, a barrel body, and a barrel lid, and a barrel assembly that is driven by rotation around an axis extending in a horizontal direction at an eccentric position from the orbital axis in the turret; a fixing member that changes between a fixed form that fixes the barrel lid to the barrel body and a release form that releases the fixation of the barrel lid to the barrel body; a distance measuring unit positioned toward a measurement direction according to the horizontal direction with respect to a detection area located on the orbital path of the barrel assembly centered on the orbital axis, and a control unit; wherein the fixing member has a part to be measured whose position is displaced between the fixed form and the release form, and when changing from the fixed form to the release form, the part to be measured is displaced from the measurement direction of the distance measuring unit in a direction intersecting with the measurement direction, and the control unit determines whether or not a fixed distance representing the horizontal distance to the part to be measured by the distance measuring unit is being measured when the barrel assembly is located in the detection area, and the A centrifugal barrel grinder characterized by controlling the rotation of the turret so as not to allow it when the fixed viewing distance is not measured, and the distance measuring unit measuring the horizontal distance from the distance measuring unit to the position where the trajectory of the measuring light of the distance measuring unit intersects the side surface of the measured part as the fixed viewing distance. Claim 3 A centrifugal barrel grinder according to claim 1 or 2, wherein the distance measuring unit measures the distance to an object by irradiating a measuring light along the measuring direction and receiving the measuring light reflected from an object located in the measuring direction, and when the barrel is located in the detection area, the detection area has only the part to be measured as an object capable of reflecting the measuring light at the fixed distance. Claim 4 A centrifugal barrel grinder according to claim 1 or 2, wherein the turret has an inner surface facing the direction in which the orbital axis extends and an outer surface facing the opposite side to the inner surface in the direction in which the orbital axis extends, by spreading radially around the orbital axis, the barrel jaw is located on the inner surface side with respect to the turret, and the distance measuring unit is mounted on the outer side of the outer surface side of the turret in the direction in which the orbital axis extends. Claim 5 A centrifugal barrel grinder according to paragraph 3, characterized in that it is equipped with a rotation mechanism that transmits the rotational driving force of a rotational driving source to enable rotation of the rotation axis, and the rotation mechanism includes a gear member, a timing belt member, and a chain member.

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