JP2007032722A - Rotary indexing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary indexing device of a simple structure capable of surely operated as a stop position of a rotating shaft is not displaced even when considerable external force is applied to the rotating shaft. <P>SOLUTION: First and second racks 39, 40 of this rotary indexing device are mounted so that both of the first and second racks 39, 40 are engaged with a pinion 37 when a rack frame 38 is located at a neutral position, the first rack and the pinion are completely engaged with each other, and the pinion and the second rack are disengaged when the rack frame is deflected with a transverse frame 30 to one side from the neutral position by a first fluid cylinder mechanism, and the second rack and the pinion are completely engaged with each other, and the pinion and the first rack are disengaged when the rack frame is deflected to the other side from the neutral position. The rotating shaft 5 is divisionally rotated by a prescribed angle by reciprocating the rack frame by a second fluid cylinder while allowing the first and second racks are to be alternately engaged with the pinion by the first fluid cylinder mechanism, and the rotating shaft is positioned and fixed by a stopper mechanism 6 every prescribed rotating angle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary indexing device for rotating a rotary shaft by a predetermined angle by a fluid cylinder mechanism using pneumatic pressure, hydraulic pressure, or the like.

As an apparatus that converts the reciprocating operation of the cylinder mechanism into a rotating operation using a rack and pinion mechanism and drives the rotary shaft to rotate and index by a predetermined angle, for example, a device described in Patent Document 1 is available. Proposed.
JP 2000-55009 A

  The apparatus described in the document includes a rotation shaft having a pinion that is rotatably supported by the main body, a main cylinder disposed on both sides of the main body on a plane perpendicular to the rotation shaft, and these A sub-cylinder arranged on both sides perpendicular to the main cylinder, and an integrated piston member in which two pistons are integrally provided via a body part, and these pistons are arranged in the two main cylinders; A pair of rack members that are supported by the body portion and can be separated from and attached to the pinion from opposite directions, and are arranged in the respective sub-cylinders, and these rack members are attached to the pinion via springs. And a piston to be separated.

  When the rotary shaft is driven to rotate, the rack member on the side adjacent to this is pressed against the pinion with the piston of one sub-cylinder, and the other rack member is pressed with the rack retracting member to retract from the pinion. In this state, by moving the integral piston member in one direction, the rotating shaft is rotated via the pinion when the rack member engaged with the pinion moves together with the piston member.

  When the piston member moves to the stroke end and stops, the other sub-cylinder piston pushes the rack member on the side adjacent to the pinion to engage with it, and pushes the rack member on the opposite side with the rack retracting member to retract from the pinion. Let

  When the piston member is further moved in the opposite direction from this state, the rotation shaft is rotated again in the same direction when the rack member engaged with the pinion moves together with the piston member. By repeating such a procedure alternately, the rotation angle can be rotated in the same direction by the rotation angle corresponding to the stroke of the piston member.

  In addition, when the rotating shaft is stopped, both rack members are biased by the springs so as to engage with the pinion even when no pressure is supplied to the sub-cylinders on both sides. The rotation is locked.

  In the device described in Patent Document 1 described above, when a large external force acts on the rotating shaft for some reason when the rotating shaft is stopped when air is not supplied to the sub-cylinders on both sides, the pinion There is a possibility that the member will push against both sides against the biasing force of the spring and rotate, and once the pinion and the rack member are disengaged, the piston member will rotate when it moves to the stroke end. There was a problem that the shaft shifted from the normal rotation stop position.

  Even when one rack member is engaged with the pinion and rotating the rotating shaft, if a large external force is applied to the rotating shaft, the rack member engaged with the pinion is pushed away to disengage and the rotating shaft is stopped. There was a risk that the position would shift. Further, since the two rack members are supported so as to be individually movable with respect to the body portion of the piston member, there is a problem that the number of movable parts is large and the structure is complicated.

  Accordingly, the present invention solves the above-described problems in the prior art, and even when a large external force is applied to the rotating shaft, the rotating shaft does not shift the stop position, and the rotation indexing device is reliable and simple in structure. The purpose is to provide.

  In order to achieve the above object, a rotary indexing device of the present invention includes a machine frame, a lateral movement frame that is held so as to be linearly movable in the first direction with respect to the machine frame, A rack frame that is held so as to be linearly movable in a second direction orthogonal to the direction of 1, and held so as to be rotatable about an axis perpendicular to both the first direction and the second direction with respect to the machine frame. The rotating shaft, the pinion provided so as to rotate integrally with the rotating shaft, and a part of the rack frame in parallel along the second direction so as to face each other across the pinion A first rack and a second rack, a first fluid cylinder mechanism provided in the machine frame for reciprocating the lateral movement frame in the first direction, and provided in the machine frame, the rack frame being the second A second fluid cylinder mechanism that reciprocates in the direction of When the rack frame is in the neutral position, both the first and second racks maintain engagement with the pinion, and the rack frame is biased to one side from the neutral position. When the first rack and the pinion are completely engaged with each other, and when the engagement between the pinion and the second rack is released and the rack frame is biased from the neutral position to the other side, the second rack and the pinion are completely engaged. The pinion and the first rack are arranged so as to be disengaged while being engaged with each other.

  In the rotary indexing device of the present invention, the first fluid cylinder mechanisms are arranged on both sides of the lateral movement frame in the first direction, respectively, and are energized to urge the lateral movement frames to be balanced at the neutral positions. A pair of single-acting air cylinder mechanisms that have members and push alternately in opposite directions across the neutral position, and the second fluid cylinder mechanism is disposed on both sides of the rack frame in the second direction Thus, it is desirable to be a pair of single-acting air cylinder mechanisms that alternately push the rack frames in opposite directions.

  Further, in the rotary indexing device of the present invention, the stopper mechanism is fixed to the rotating shaft, and an indexing disc provided with a plurality of indexing holes at equal intervals on the circumference around the rotating shaft; It is also desirable that it is composed of a fluid cylinder mechanism that is fixed to the machine frame and that inserts and removes the stopper pin from the direction parallel to the axis of the rotary shaft with respect to the index hole.

According to the invention of claim 1, since the pinion is always meshed with at least one of the first rack and the second rack, the mesh between the rack and the pinion is disengaged even if a large external force is applied to the rotating shaft. There is no fear that the stop position of the rotating shaft will be shifted.
In addition, since the first rack and the second rack are integrally configured as a part of the rack frame, it is possible to provide a rotary indexing device with a small number of movable parts, a reliable operation, and a simple structure. it can.

  According to the invention of claim 2, since the pair of single-acting air cylinder mechanisms are used for the first fluid cylinder mechanism and the second fluid cylinder mechanism, respectively, the drive control is simple and a clean environment is provided. It can be suitably used in a required place.

  Further, when the air supply to these air cylinder mechanisms stops in the middle of the rotation of the rotary shaft, the lateral movement frame moves to the neutral position by the urging force of the urging member, and the first rack and the second rack Since the pinion meshes with both of them and the rotation of the rotating shaft is restrained, the rotating shaft is not inadvertently rotated by an external force.

  Further, according to the invention of claim 3, the stopper mechanism is fixed to the rotating shaft and has an indexing disc provided with a plurality of indexing holes at equal intervals on a circumference centered on the rotating shaft. Since it is composed of a fluid cylinder mechanism that is fixed to the frame and that inserts and removes the stopper pin from the direction parallel to the axis of the rotary shaft with respect to the index hole, the indexing accuracy of the rotary shaft can be increased.

  In addition, since the rotating shaft can be reliably stopped by a relatively small diameter stopper pin and a small fluid cylinder mechanism that drives the stopper pin, the stopper mechanism can be made compact, and as a result, the rotation index The entire apparatus can be reduced in size and weight.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a rotary indexing device of the present invention, FIG. 2 is a right side view, FIG. 3 is a plan view, FIG. FIG. 6 is a cross-sectional view taken along the line CC of FIG. 3. As shown in these figures, the rotary indexing device 1 includes a block-shaped machine frame 2 (FIGS. 5 and 6). The rotating shaft 5 is rotatably held around a vertical axis by bearings 3 and 4.

  In the present embodiment, tapered roller bearings are used for these bearings 3 and 4 so as to receive a thrust load as well as a radial load. Note that the radial load and the thrust load may be received by separate bearings.

  The upper end of the rotating shaft 5 protrudes upward from the machine frame 2 and passes through a hole 7A formed in a mounting plate 7 to which a stopper mechanism 6 (see FIG. 6) to be described later is attached. The indexing disk 9 is fixed by the fastener 8. The fastener 8 has a well-known structure that is generally commercially available for frictionally fixing a rotating body such as a pulley to the rotating shaft.

  As shown in FIG. 3, on the upper surface of the indexing disk 9, a work table T (see FIG. 1 and FIG. A screw hole 9A for fixing with a bolt (not shown) is formed. The work table T may be manufactured integrally with the indexing disk 9.

  Further, between the screw holes 9A adjacent to each other in the circumferential direction, positioning holes 9B are arranged at four locations at 90 ° central angles on the circumference around the rotation shaft 5, and these positioning holes A hollow bush 10 made of special steel having high wear resistance is fitted and fixed to the inner periphery of 9B.

  The inner peripheral surface of the bush 10 in the positioning hole 9B is finished with high accuracy. The stopper pin 11 provided in the stopper mechanism 6 is inserted into the bushing 10 from below so that the rotation of the indexing disk 9 is restrained. It has come to be.

  When the indexing disc 9 itself is made of a material with high wear resistance, the stopper pin 11 is directly inserted into the positioning hole 9B finished with high accuracy without using the bush 10. It may be.

  As shown in FIG. 6, the lower portion of the stopper pin 11 is integrally connected to a piston rod 14 fixed to a piston 13 that is fitted in the air cylinder 12. A compression coil spring 15 is provided between the piston 13 and the bottom surface of the cylinder chamber 12 </ b> A of the air cylinder 12, and the stopper pin 11 is always provided via the piston 13 and the piston rod 14 by the compression coil spring 15. The projection disk 9 is biased in the protruding direction so as to be fitted into the bush 10.

  In addition, intake and exhaust ports A1 and A2 are formed on both sides of the cylinder chamber 12A with the piston 13 in between, and high pressure air supplied from a high pressure air source (not shown) from the upper intake and exhaust port A1 is supplied to the cylinder chamber. When flowing into 12A, the piston 13 is displaced downward while resisting the urging force of the compression coil spring 15, retracting the stopper pin 11 downward from the bush 10 and releasing the restriction of the rotation of the indexing disk 9. . At this time, the opposite intake / exhaust port A2 is opened to the atmosphere, and air in the opposite cylinder chamber 12A is exhausted with the intake / exhaust port A1 and the piston 13 interposed therebetween.

  On the other hand, when high-pressure air is introduced into the cylinder chamber 12A from the intake / exhaust port A2 and the intake / exhaust port A1 is opened to the atmosphere, an upward force acts on the piston 13 and the compression coil spring 15 is attached. The stopper pin 11 is press-fitted into the bush 10 by applying a force.

  The stopper pin 11 is lifted by the urging force of the compression coil spring 15 when the intake / exhaust port A1 is opened to the atmosphere, but in the present embodiment, the inner peripheral surface of the bush 10 and the outer peripheral surface of the stopper pin 11 Even when the frictional resistance between the stopper pin 11 and the bush 10 is high, the stopper pin 11 can be reliably fitted into the bush 10 by introducing high-pressure air from the intake / exhaust port A2.

  Further, on the outer periphery of the piston 13, a seal ring 16 is provided for maintaining airtightness with the inner peripheral surface of the cylinder chamber 12 </ b> A, and an annular magnet 17 is provided. The magnetic field generated by the magnet 17 is detected by a pair of magnetic sensors 18A and 18B provided on the outer surface of the air cylinder 12, as shown in FIG. The magnetic sensor 18A outputs a detection signal at a position protruding upward, and the magnetic sensor 18B outputs a detection signal at a position where the stopper pin 11 is retracted downward.

  The air cylinder 12 is integrally connected to a bearing piece 20 whose upper end is attached to the mounting plate 7 via a spacer block 19, and the stopper pin 11 is vertically moved by a bearing sleeve 21 provided on the bearing piece 20. Is slidably guided.

  The attachment plate 7 is formed with a through hole 7B for allowing the stopper pin 11 to pass therethrough. The spacer block 19 and the bearing piece 20 together with the air cylinder 12 are parts that constitute the stopper mechanism 6 in the present invention.

  In addition, as shown in FIG. 6, air cylinders 22 and 23 are fixed to the left and right sides of the machine casing 2. Pistons 24 and 25 are provided in the air cylinders 22 and 23 so as to be slidable in the left-right direction (first direction), respectively.

  The annular grooves 24A and 25A formed on the outer peripheral surfaces of the pistons 24 and 25 have seal rings for hermetically sealing the space between the cylinder chambers 22A and 23A of the air cylinders 22 and 23, respectively. 26 and 27 are attached.

  In addition, spring holding recesses 24B and 25B are formed on the back sides of the pistons 24 and 25, respectively, and these spring holding recesses 24B and 25B and the inner wall surfaces of the cylinder chambers 22A and 23A facing these spring holding recesses 24B and 25B, respectively. In between, compression coil springs 28 and 29 are incorporated. As shown in FIG. 4, the air cylinders 22 and 23 are formed with intake and exhaust ports B1 and B2 that open to the back side of the pistons 24 and 25 of the cylinder chambers 22A and 23A, respectively.

  The front surfaces of the pistons 24 and 25 are always in contact with the left and right side surfaces of the lateral movement frame 30 held so as to be linearly movable in the left-right direction with respect to the machine frame 2 by the biasing forces of the compression coil springs 28 and 29, respectively. When the state is maintained and air is not supplied to the intake / exhaust ports B1 and B2 from the outside, the lateral movement frame 30 is urged by the compression coil springs 28 and 29, and the state shown in FIGS. It is held in the neutral position shown.

  As shown in FIG. 6, the lateral movement frame 30 is composed of a horizontal portion and a pair of vertical portions that rise from both sides thereof, and a through hole 30A through which the rotating shaft 5 passes is formed near the center of the horizontal portion. Yes.

  As shown in FIG. 4, the air cylinders 22 and 23 hold the sensor pins 31 and 32 so as to be linearly movable in the same direction as the pistons 24 and 25. These sensor pins 31 and 32 are compressed coils. Due to the urging force of the springs 33, 34, the respective front ends are held so as to be always in contact with the respective outer surfaces of the pair of vertical portions of the lateral movement frame 30.

  Therefore, when the lateral movement frame 30 moves to the left and right together with the pistons 24 and 25, these sensor pins 31 and 32 follow and move forward and backward. On the other hand, transmission type optical sensors 35 and 36 are attached to the rear ends of the air cylinders 22 and 23, respectively, and the lateral movement frame 30 moves to the left or right movement limit position as the pistons 24 and 25 move. When one of these transmissive optical sensors 35 and 36 detects the rear end of the sensor pins 31 and 32 when displaced, the position of the lateral movement frame 30 can be indirectly detected.

  On the other hand, the rotary shaft 5 is provided with a pinion 37 integrally therewith. In this embodiment, the pinion 37 is formed by machining integrally with the rotary shaft 5, but is manufactured separately from the rotary shaft 5 and fixed to the rotary shaft 5 with a key or the like. May be.

  On both the left and right sides of the pinion 37, a rack 39 (first rack) and a rack 40 (second rack) that constitute two parallel sides of the rack frame 38 are arranged to face each other. When the rack frame 38 is in the neutral position shown in FIG. 4, these racks 39 and 40 both maintain meshing with the pinion 37. In this state, the pinion 37 and the rotating shaft integral therewith are maintained. 5 is restricted in rotation.

  As shown in FIG. 5, the rack frame 38 having these racks 39 and 40 is sandwiched between a connection frame 41 and a connection auxiliary frame 41 </ b> A that is screwed and disassembled thereto. These members are held so as to be slidable in the left-right direction together with the lateral movement frame 30.

  Pistons 42 and 43 are fixed to the front and rear sides of the connecting frame 41 by bolts 44 and 45, respectively. As is apparent from FIG. 5, these pistons 42 and 43 are provided slidably in the front and rear direction (second direction) in air cylinders 46 and 47 fixed to the front and rear sides of the machine frame 2, respectively. Yes.

  The annular grooves 42A and 43A formed on the outer peripheral surfaces of the pistons 42 and 43 have seal rings for hermetically sealing the space between the cylinder chambers 46A and 47A of the air cylinders 46 and 47, respectively. 48 and 49 are attached.

  Wear rings 50 and 51 that are in sliding contact with the inner peripheral surfaces of the cylinder chambers 46A and 47A are mounted on the outer peripheral surfaces of the pistons 42 and 43, adjacent to the seal rings 48 and 49, respectively.

  Further, as shown in FIG. 5, seal plates 54 and 55 for holding the heads of the bolts 44 and 45 airtightly via seal rings 52 and 53 are fixed to the pistons 42 and 43 by bolts. Yes.

  On the other hand, as shown in FIGS. 4 and 6, the rack frame 38 is restricted in relative displacement in the left-right direction with respect to the lateral movement frame 30 by a pair of right and left vertical portions of the lateral movement frame 30. At the same time, it is guided and supported so as to be slidable in the front-rear direction.

  As shown in FIG. 4, the air cylinders 46 and 47 are formed with intake and exhaust ports C1 and C2 that open to the back side of the pistons 42 and 43 of the cylinder chambers 46A and 47A, respectively.

  Further, stroke end adjusting bolts 58 and 59 are screwed through the screw holes 56 and 57 formed at the center of the end wall of each of the cylinder chambers 46A and 47A. The end surfaces of the stroke end adjusting bolts 58 and 59 protruding into the cylinder chambers 46A and 47A abut against the seal plates 54 and 55 of the pistons 42 and 43, respectively, so that the stroke limit positions before and after the pistons 42 and 43 are set. It is regulated to be adjustable.

  These stroke end adjustment bolts 58 and 59 are fixed to the adjustment positions by tightening lock nuts 60 and 61, respectively, and between the screw holes 56 and 57 and the stroke end adjustment bolts 58 and 59 by seal washers 62 and 63, respectively. The gap is sealed.

  As shown in FIG. 4, magnet housing recesses 42 </ b> B and 43 </ b> B are formed at positions close to the outer peripheral side on the respective end surfaces of the pistons 42 and 43 that are in contact with the connection frame 41. Magnets 64 and 65 are incorporated.

  These magnets 64 and 65 are detected by a magnetic sensor 66 or a magnetic sensor 67 attached to the outer peripheral surfaces of the air cylinders 46 and 47, respectively, at positions where the pistons 42 and 43 have moved to the front or rear stroke end. These magnetic sensors 66 and 67 are fixed to the outer peripheral surfaces of the air cylinders 46 and 47 so that the front and rear positions can be adjusted.

  Next, the operation of the rotary indexing device of the present invention configured as described above will be described. As shown in FIG. 4, the rotary indexing device 1 has pistons 24 and 25 attached with compression coil springs 28 and 29, respectively, in an initial state where high-pressure air is not introduced into any of the air cylinders 22 and 23. In this state, the lateral movement frame 30 is in a neutral position, and both the rack 39 and the rack 40 that constitute a part of the rack frame 38 are in shallow mesh with the pinion 37.

  The rack frame 38 having these racks 39 and 40 is at the stroke limit position on the left side of the figure together with the connecting frame 41, and the end faces of the seal plate 54 of the piston 42 and the stroke end adjusting bolt 58 facing each other. The two are in contact.

  Further, as shown in FIG. 6, the stopper pin 11 of the stopper mechanism 6 protrudes upward from the mounting plate 7 and is fitted into one bush 10 in the positioning hole 10 formed in the indexing disk 9 to rotate. The rotation of the shaft 5 is constrained.

  When the pinion 37 is driven to rotate counterclockwise in FIG. 4 from this state, as shown in FIG. 7, high pressure air is introduced into the one cylinder chamber 22A from the intake / exhaust port B1, and the other cylinder chamber is introduced. When the air in 23A is discharged to the outside from the intake / exhaust port B2, one piston 24 moves forward, and at the same time, the lateral movement frame 30 moves with the rack frame 38 and is pushed by the lateral movement frame 30. The other piston 25 moves backward against the urging force of the compression coil spring 29.

  As a result, as shown in FIG. 7, the engagement between the one rack 39 and the pinion 37 is disengaged, and the teeth of the other rack 40 are completely engaged with the pinion 37. (Step 1)

  When the piston 24 and the piston 25 advance or retreat to the stroke end, one transmissive optical sensor 35 is in a non-detection state of the sensor pin 31, and the other transmissive optical sensor 36 is in a detection state of the sensor pin 32.

  Based on these signals, an electromagnetic switching valve (not shown) operates to introduce high-pressure air from one intake / exhaust port A1 shown in FIG. 6, and air in the cylinder chamber 12A from the other intake / exhaust port A2. Exhausted.

  As a result, the stopper pin 11 is retracted downward from the bush 10 of the indexing disk 9 to freely rotate the rotating shaft 5. (Step 2)

  When the stopper pin 11 is retracted downward, the magnet 17 is detected by the magnetic sensor 18B shown in FIG. 2, and an electromagnetic switching valve (not shown) is operated by the detection signal, and as shown in FIG. High-pressure air is introduced from the intake / exhaust port C1 into 46A, and the air in the other cylinder chamber 47A is exhausted from the intake / exhaust port C2.

  Accordingly, the piston 42 moves the rack frame 38 to the right side of the figure via the connecting frame 41. At this time, the rack 40 meshing with the pinion 37 causes the pinion 37 to rotate counterclockwise in the figure. Rotate.

  Further, the piston 43 on the opposite side connected to the connecting frame 41 also moves to the right together with the piston 42, and eventually the end surface of the seal plate 55 comes into contact with the opposite end surface of the stroke end adjusting bolt 59. Thus, the rotation of the pinion 37 is stopped. (Step 3)

  The pair of stroke end adjustment bolts 58, 59 are adjusted so that the stroke of the racks 39, 40 moving forward and backward matches the indexing angle of the rotary shaft 5, and the rack 40 moves the pinion 37 to the right stroke end. When rotated, the bush 10 of the next positioning hole 9B of the indexing disk 9 faces the stopper pin 11 retracted downward.

  Thus, when the rotation of the pinion 37 is stopped, one of the magnetic sensors 67 outputs a stroke end detection signal, and based on this, an electromagnetic switching valve (not shown) is operated, and the stopper mechanism 6 shown in FIG. The exhaust port A1 is opened to the atmosphere, and high-pressure air is introduced into the cylinder chamber 12A from the other intake / exhaust port A2.

  As a result, the stopper pin 11 is raised by the pressure of the high pressure air in addition to the urging force of the compression coil spring 15, and is fitted into the bush 10 provided in the positioning hole 9B of the indexing disk 9, and again the rotation shaft. The rotation of 5 is constrained. (Step 4)

  When the magnetic sensor 18A shown in FIG. 2 detects that the stopper pin 11 has been lifted, an electromagnetic switching valve (not shown) is operated based on this, and as shown in FIG. 9, the intake / exhaust gas is introduced into the cylinder chamber 23A. High-pressure air is introduced from the port B2, while air in the opposite cylinder chamber 22A is discharged to the outside from the intake / exhaust port B1.

  Then, the piston 25 moves forward, and at the same time, the lateral movement frame 30 moves with the rack frame 38, and the other piston 24 resists the biasing force of the compression coil spring 28 by being pushed by the lateral movement frame 30. To retreat.

  As a result, as shown in the figure, the rack 40 and the pinion 37 are disengaged, and the teeth of the opposite rack 39 are completely engaged with the pinion 37. (Step 5)

  When the piston 24 and the piston 25 retreat or advance to the stroke end, the transmission type optical sensor 35 is in the detection state of the sensor pin 31, while the transmission type optical sensor 36 is in the non-detection state of the sensor pin 32.

  Based on these signals, an electromagnetic switching valve (not shown) is operated, high-pressure air is introduced from one intake / exhaust port A1 shown in FIG. 6, and air in the cylinder chamber 12A is exhausted from the other intake / exhaust port A2. The stopper pin 11 is retracted downward from the bush 10 of the indexing disk 9 so that the rotary shaft 5 can freely rotate. (Step 6)

  When the stopper pin 11 is retracted downward, the magnet 17 is detected by the magnetic sensor 18B shown in FIG. 2, and an electromagnetic switching valve (not shown) is operated by the detection signal, so that the inside of the cylinder chamber 47A as shown in FIG. The high pressure air is introduced into the intake / exhaust port C2, and the air in the opposite cylinder chamber 46A is discharged from the intake / exhaust port C1.

  Then, the piston 43 moves the rack frame 38 to the left in the figure via the connecting frame 41, and at this time, the rack 39 engaged with the pinion 37 rotates the pinion 37 counterclockwise in the figure. .

  Then, the piston 42 on the opposite side connected to the connecting frame 41 also moves to the left together with the piston 43, and eventually the end surface of the seal plate 54 comes into contact with the opposite end surface of the stroke end adjusting bolt 58. Thus, the rotation of the pinion 37 is stopped. (Step 7)

  Thus, when the rotation of the pinion 37 is stopped, the magnetic sensor 66 outputs a detection signal of the stroke end, and based on this, an electromagnetic switching valve (not shown) is operated, and the intake / exhaust port of the stopper mechanism 6 shown in FIG. A1 is opened to the atmosphere, and high-pressure air is introduced into the cylinder chamber 12A from the other intake / exhaust port A2, and the stopper pin 11 is raised so as to be provided in the positioning hole 9B of the indexing disc 9. 10 is inserted, and the rotation of the rotating shaft 5 is restrained again. (Step 8)

  When the indexing rotation of the rotating shaft 5 is further continued in the same direction, the steps 1 to 8 described above may be repeated as many times as necessary. Further, when rotating the rotating shaft 5 in the reverse direction (clockwise in FIG. 4), the contents of the operations in Step 1 and Step 5 are interchanged, and in Step 1, the rack 39 and the pinion 37 are engaged. The rack 40 may be engaged with the pinion 37.

  In the series of operations described above, the intake / exhaust ports A1, A2, the intake / exhaust ports B1, B2, and the electromagnetic switching valve for switching the intake / exhaust to the intake / exhaust ports C1, C2 are replaced with the magnetic sensors 18A, 18B, the transmission type optical sensor 35. , 36 and the detection outputs of the magnetic sensors 66 and 67 can be performed by controlling with a microcomputer or a sequencer.

  The “first fluid cylinder mechanism” in the claims corresponds to the air cylinder mechanism and the air cylinder mechanism configured by the air cylinder 22 and the piston 24 and the air cylinder 23 and the piston 25, respectively, in the present embodiment. The “second fluid cylinder mechanism” corresponds to an air cylinder mechanism including the air cylinder 46 and the piston 42 and the air cylinder 47 and the piston 43, respectively.

  In the embodiment described above, a single-acting air cylinder mechanism is arranged on each of the left and right sides of the machine frame to move the lateral movement frame in the left and right direction of the machine frame and to switch the rack engaged with the pinion. However, instead of this, only one double-acting air cylinder mechanism may be provided on either the left or right side of the machine frame, and the lateral movement frame may be moved by this air cylinder mechanism.

  Similarly, in this embodiment, in order to move the connecting frame in the front-rear direction of the machine frame, one single-acting air cylinder mechanism is arranged on each of the front and rear sides of the machine frame. Thus, only one double-acting air cylinder mechanism may be provided on either the front or rear side of the machine frame, and the connecting frame may be moved by this air cylinder mechanism.

  Furthermore, a fluid cylinder mechanism other than an air cylinder mechanism, such as a hydraulic cylinder mechanism, may be used as a mechanism for driving the laterally moving frame and the connecting frame. In this embodiment, the stopper mechanism has a structure in which the stopper pin is inserted into and removed from the bush incorporated in the positioning hole of the indexing disk by the air cylinder mechanism. However, the stopper mechanism is not limited to the mechanism of this embodiment. Any function can be used as long as it has a function capable of positioning and holding for each predetermined index rotation angle.

  INDUSTRIAL APPLICABILITY The present invention can be used as a rotary indexing device for indexing the rotation angle of a workpiece in a manufacturing process or an inspection process of a machine part, and in an environment where an explosive substance is handled, It can be suitably used in places where use is restricted.

It is a front view showing one embodiment of the rotation indexing device of the present invention. It is a right view which shows one Embodiment of the rotation index apparatus of this invention. It is a top view which shows one Embodiment of the rotation indexing apparatus of this invention. It is AA sectional drawing of FIG. 1 which shows the state in which both racks meshed | engaged with the pinion. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. 1 which shows the state which only one rack meshed | engaged with the pinion. It is AA sectional drawing of FIG. 1 which shows the state in the middle of rotation operation of a pinion. It is AA sectional drawing of FIG. 1 which shows the state which switched the rack which meshes with a pinion. It is AA sectional drawing of FIG. 1 which shows the state in the middle of rotation operation of a pinion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation indexing device 2 Machine frame 3, 4 Bearing 5 Rotating shaft 6 Stopper mechanism 7 Mounting plate 7A, 7B Through hole 8 Fastener 9 Indexing disk 9A Screw hole 9B Positioning hole 10 Bush 11 Stopper pin 12 Air cylinder 12A Cylinder chamber 13 piston 14 piston rod 15 compression coil spring 16 seal ring 17 magnet 18A, 18B magnetic sensor 19 spacer block 20 bearing piece 21 bearing sleeve 22, 23 air cylinder 22A, 23A cylinder chamber 24, 25 piston 24A, 25A annular groove 24B, 25B Spring retaining recesses 26, 27 Seal rings 28, 29 Compression coil spring 30 Lateral movement frame 30A Through holes 31, 32 Sensor pins 33, 34 Compression coil springs 35, 36 Transmission type optical sensor 37 Pinion 38 Rack frame 39 Rack (first rack) )
40 racks (second rack)
41 connecting frame 41A interlocking auxiliary frame 42, 43 piston 42A, 43A annular groove 42B, 43B magnet housing recess 44, 45 bolt 46, 47 air cylinder 46A, 47A cylinder chamber 48, 49 seal ring 50, 51 wear ring 52, 53 seal Rings 54, 55 Seal plates 56, 57 Screw holes 58, 59 Stroke end adjusting bolts 60, 61 Lock nuts 62, 63 Seal washers 64, 65 Magnets
66, 67 Magnetic sensor

Claims (3)

The machine frame,
A lateral movement frame that is held so as to be linearly movable in the first direction with respect to the machine frame;
A rack frame held so as to be linearly movable in a second direction orthogonal to the first direction with respect to the lateral movement frame;
A rotating shaft held rotatably about an axis perpendicular to both the first direction and the second direction with respect to the machine frame;
A pinion provided to rotate integrally with the rotating shaft;
A first rack and a second rack provided as part of the rack frame in parallel along the second direction so as to face each other across the pinion;
A first fluid cylinder mechanism provided in the machine frame for reciprocating the lateral movement frame in the first direction;
A second fluid cylinder mechanism provided in the machine frame for reciprocating the rack frame in the second direction;
A stopper mechanism that is provided on the machine frame and positions and fixes the rotation shaft at predetermined rotation angles;
The first and second racks both maintain meshing with the pinion when the rack frame is in the neutral position, and the first rack and the pinion when the rack frame is biased to one side from the neutral position. Is completely engaged, and when the engagement between the pinion and the second rack is disengaged and the rack frame is biased from the neutral position to the other side, the second rack and the pinion are completely engaged, and the pinion and the first rack are also engaged. The rotary indexing device is arranged so as to be disengaged from the rotary indexing device.   The first fluid cylinder mechanism includes biasing members that are arranged on both sides of the lateral movement frame in the first direction and bias the lateral movement frames so as to be balanced at the neutral positions, and sandwich the neutral position. And the second fluid cylinder mechanism is disposed on both sides of the rack frame in the second direction so that the rack frames are alternately opposed to each other. The rotary indexing device according to claim 1, wherein the rotary indexing device is a pair of single-acting air cylinder mechanisms that push.   The stopper mechanism is fixed to the rotating shaft, and is provided with an indexing disc provided with a plurality of indexing holes at equal intervals on the circumference centered on the rotating shaft, and fixed to the machine frame, with respect to the indexing hole. 3. A rotary indexing device according to claim 1, wherein the rotary indexing device comprises a fluid cylinder mechanism for inserting and removing a stopper pin from a direction parallel to the axis of the rotary shaft.

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