JP2004216462A - Turn table positioning mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positioning mechanism for positioning an object in a short time without the need for complicated control. <P>SOLUTION: A plurality of protruded portions 2a, 2b, 2c, 2d provided on one surface of a turn table 2 are arranged in such a manner that their directions in view from a rotational center are mutually different and their distance from the rotational center of the turn table are mutually different. A displacing means is provided for displacing a fixing device 8 for fixing the protruded portions 2a, 2b, 2c, 2d to a direction perpendicular to the rotational center of the turn table 2 to oppose it to each of the protruded portions 2a, 2b, 2c, 2d. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a positioning mechanism for fixing a rotating turntable at a plurality of predetermined positions.
[0002]
[Prior art]
BACKGROUND ART In a conventional object positioning mechanism, for example, a turntable positioning mechanism, a plurality of positioning pins (projections) on a lower surface of a table, a stopper having one end to which the positioning pins can abut, and a turntable in contact with the positioning pins. And a claw member (fixing device) for abutting against the multiple ends of the stopper and holding the positioning pin with one end of the stopper is provided, and the plurality of positioning pins are mutually directed in the direction viewed from the rotation center of the turntable. They are arranged so that they are different and the distance from the rotation center of the turntable is equal. (See Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. Sho 62-110844
[Problems to be solved by the invention]
However, in this conventional structure, when a predetermined positioning pin of a plurality of positioning pins is fixed and the turntable is fixed at a predetermined position, the predetermined positioning pin is repeatedly operated by retracting and extending the claw member. It is necessary to repeatedly fix and release the positioning pin in order until the fixing position is reached. Therefore, there is a problem that the time required for the positioning becomes longer and the control of the claw members becomes complicated.
[0005]
In view of the above problems, an object of the present invention is to provide a positioning mechanism capable of positioning an object in a short time without requiring complicated control.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a positioning mechanism for fixing a turntable at a plurality of predetermined positions, wherein a plurality of protrusions are provided on one surface of the turntable, and the protrusions are fixed on one surface of the turntable. The plurality of protrusions are arranged so that the directions viewed from the rotation center of the turntable are different from each other and the distances from the rotation center of the turntable are different from each other, and the fixing device is connected to the rotation axis of the turntable. And a displacing means for displacing in a direction perpendicular to the plurality of projections and facing each of the plurality of projections.
[0007]
According to this, by stopping the fixing device at the position facing the projection to be fixed by the displacement means, other projections do not interfere with the fixing device when the turntable rotates. Therefore, the turntable can be rotated at a stroke until the projection to be fixed comes to the fixing position, and the object can be positioned in a short time.
[0008]
In addition, the fixing device includes a pair of claw members each having a contact portion that is positioned on each side of the protrusion in the traveling path direction with respect to the fixing position of the protrusion and abuts on each side of the protrusion in the traveling path direction. An urging means for urging the abutting portion of the pair of claw members in the object direction, and, when the protrusion has advanced to the fixing device position, the protrusion and the claw member on the rear side in the traveling path direction Due to the contact, the abutting portion of the claw member is displaced in the opposite direction to the object against the urging force, and further advancing of the projection causes the abutting portion of the claw member on the front side in the traveling path direction to be in front of the projection in the traveling path direction of the projection. At the same time, the contact portion of the claw member on the rear side in the traveling path direction is displaced in the object direction by the urging force and abuts on the rear surface of the projection in the traveling path direction. To secure the object in place. It is preferable to. According to this, the claw member on the rear side in the traveling path retreats in the opposite direction to the object due to the action of the force due to the advance of the projection, and when the action of the force is no longer exerted by the further projection, the rear side in the traveling path direction. Since the claw member is displaced in the direction of the object, the positioning of the object can be performed in a short time without requiring complicated control.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIGS. 1 and 2, reference numeral 1 denotes a turntable device to which the positioning mechanism according to the present invention is applied, and includes a table 2 that rotates on a rotation shaft 2a provided on a lower surface.
[0010]
The turntable device 1 includes a pair of first substrates 3 having a rectangular shape, a second substrate 4 having a substantially square shape which is erected on the pair of first substrates 3 with bolts, and provided on the second substrate 4. And a rotating shaft support member 5. The upper portion of the rotary shaft 2a of the table 2 is rotatably supported via a bearing 6 provided on the inner surface of the rotary shaft support member 5.
[0011]
A lower portion of the rotary shaft 2a of the table 2 is a driven pulley, and a belt 7 is wound around the driven pulley and a driving pulley (not shown) serving as a driving source. Thus, when the driving pulley rotates forward and backward, the rotating shaft 2a rotates forward and backward, and the table 2 rotates forward and backward.
[0012]
The table 2 is formed in the shape of an octagonal plate having eight sides at every 45 degrees in the rotation direction, and has four projections at every 90 degrees in the rotation direction, ie, every other side of the octagon, on the periphery of the lower surface thereof. Parts 2b, 2c, 2d, and 2e are provided. The projections 2b, 2c, 2d, and 2e are arranged so that the distances from the rotation center of the table 2 are different from each other. Specifically, the projections 2b are set at a distance of X mm from the rotation center O of the table 2. The projection 2c is arranged at a distance of (X + Y) mm from the rotation center O, the projection 2d is arranged at a distance of (X + 2Y) mm from the rotation center O, and the projection 2e is located at (X + 3Y) from the rotation center O. mm (X and Y are predetermined numbers). Thus, when the protrusions 2c, 2d, and 2e are located at the same phase in the rotation direction, they do not occupy the same space.
[0013]
On the second substrate 4, a holding device (fixing device) 8 for holding the projections 2b, 2c, 2d, and 2e of the table 2 in a predetermined phase is provided.
[0014]
The holding device 8 includes a third substrate 8 a fixed on the second substrate 4, a pair of support plates 8 b erected in parallel on the third substrate 8 a, and a pair of support plates 8b, two guide rails 8c are provided horizontally and parallel to each other. A sliding member 8d is provided slidably with respect to the two guide rails 8c, and a pair of sliding members 8d is provided in the center of the upper surface of the sliding member 8d in a slit provided perpendicular to the guide rail 8c. Claw members 8e and 8f are provided. One end of each of the pair of claw members 8e and 8f is pivotally supported by the guide rail 8c, and is swingable about the guide rail 8c.
[0015]
At the other end of the pair of claw members 8e and 8f, contact portions 8e ₁ and 8f ₁ that are in contact with the protrusions 2b, 2c, 2d and 2e are formed, respectively. These contact portions 8e ₁ , 8f ₁ are shaped such that when the claw members 8e, 8f swing upward, the contact portions 8e ₁ , 8f ₁ come into contact with both surfaces of the projections 2b, 2c, 2d, 2e in the direction of travel along with the rotation of the table 2. It has become.
[0016]
A bracket 8g is provided upright on the third substrate 8a, and the bracket 8g and the sliding member 8d are connected to a displacement mechanism (displacement means) in which two cylinders 8h and 8i having different stroke lengths are connected at their bottoms. ). Specifically, the piston rod 8i ₁ cylinder 8i is connected to the bracket 8g with the piston rod 8h ₁ cylinder 8h is connected to the sliding member 8d. The piston rods 8h ₁ , 8i ₁ of the cylinders 8h, 8i are installed so that their extending and retracting directions are parallel to the guide rails 8c, so that the sliding members 8d can be displaced along the guide rails 8c by their retracting. Has become.
[0017]
Piston rod 8h ₁ and the piston rod 8i ₁ cylinder 8i cylinder 8h each X mm, has a retractable width 2Xmm, both cylinders 8h, when immerses 8i, claws of a pair of sliding members 8d The members 8e and 8f are disposed so as to face the passage of the protrusion 2e. Thus, the piston rod 8h ₁ and the sliding member 8d by a combination of protruding and retracted piston rod 8i ₁ cylinder 8i cylinder 8h can be displaced in four positions Xmm intervals, a pair at each position The claw members 8e, 8f can be opposed to the passage paths of the different projections 2b, 2c, 2d, 2e. Specifically, when the immerses piston rod 8i ₁ cylinder 8i with projecting the piston rod 8h ₁ cylinder 8h 1 pair of pawl members 8e, 8f are opposed to the passing path of the protruding portions 2d, the cylinder 8h When projecting the piston rod 8i ₁ cylinder 8i causes immerses piston rod 8h ₁ 1 pair of pawl members 8e, 8f are opposed to the passing path of the protruding portions 2c, with to project the piston rod 8h ₁ cylinder 8h When projecting the piston rod 8i ₁ cylinder 8i 1 pair of pawl members 8e, 8f is opposed to the passage path of the protrusion 2b.
[0018]
Referring to FIG 3, a pair of pawl members 8e, the 8f one end of (the side that is pivotally supported by the guide rails 8c), and the bottom 8j ₁ cylinder 8j respectively, is connected to the piston rod 8j ₂ and which, when the air is supplied to the upper port of the cylinder 8j, the pawl member 8e, 8f swings upward piston rod 8j ₂ is retracted. A pair of pawl members 8e, the one end of 8f, respectively projections _8e 2, and 8f ₂ is provided, the protrusion _8e 2, 8f ₂ abuts against the stopper portion 8d ₁ formed on the sliding member 8d This restricts the range in which the claw members 8e and 8f swing upward. Further, when air is supplied to the lower port of the cylinder 8j, the pawl member 8e, 8f swings downward piston rod 8j ₂ protrudes.
[0019]
Referring to FIG. 4, four detection sensors 9 a, 9 b, 9 c, and 9 d are provided via brackets at positions separated by 90 degrees in the rotation direction from the installation position of gripping device 8 on second substrate 4. ing. These four detection sensors 9a, 9b, 9c, 9d are respectively provided with the protrusions 2b, 2c, 2d, when the protrusions 2b, 2c, 2d, 2e come in phase with the detection sensors 9a, 9b, 9c, 9d. 2e. Thus, when the protrusion 2b is fixed to the gripping device 8, the protrusion 2c is detected by the detection sensor 9b, and when the protrusion 2c is fixed to the gripping device 8, the protrusion 2d is detected by the detection sensor 9c. When the projection 2d is fixed to the gripping device 8, the projection 2e is detected by the detection sensor 9d, and when the projection 2e is fixed to the gripping device 8, the projection 2b is detected by the detection sensor 9a. The detection of these detection sensors 9a, 9b, 9c, 9 confirms that the gripping device 8 fixes the protrusions 2b, 2c, 2d, 2e.
[0020]
Next, the operation of the present embodiment will be described.
[0021]
First, the table 2 is placed at the position of the table 2 where one of the four protrusions 2b, 2c, 2d, and 2e (here, as an example, the protrusion 2b) is fixed to the gripping device 8. If you want to fix, by controlling the piston rod 8h ₁ and infested the piston rod 8i ₁ cylinder 8i cylinder 8h, to face the passing path of the protrusion 2b for fixing the pair of pawl members 8e of the sliding member 8d, the 8f .
[0022]
Then, in this state, the driving pulley of the driving source is rotated, and the rotating shaft 2a of the table 2 as the driven pulley is rotated (here, as an example, the table 2 is rotated clockwise (clockwise in FIG. 1)). .). As a result, the table 2 rotates clockwise, and the protrusion 2b advances to the position of the gripping device 8.
[0023]
When the protrusion 2b to the gripping device 8 position progresses, against the biasing force of the contact portion 8f ₁ air pressure cylinder 8k claw member 8f by contact with the pawl member 8f of the protrusion 2b travel path direction rear side Displaces downward. Then, further when the projections 2b progresses, the abutting portion 8e ₁ of the traveling path direction front side of the claw member 8e comes into contact with the traveling path direction front surface of the projecting portion 2b, the contact of the pawl member 8f path of travel direction rear side part 8f ₁ comes into contact with the traveling path direction rear surface of the protrusion 2b is displaced upward by the biasing force of the cylinder 8k. Thus, the protrusion 2b are two pawl members 8e, are gripped by fixed abutment 8e _1, 8f ₁ of 8f, table 2 is fixed in the desired position.
[0024]
Subsequently, from a state in which one protrusion (here, as an example, the protrusion 2b) is fixed to the gripping device 8, the fixed state is released, and the table 2 is rotated (here, as an example, the table 2). 2 and to rotate clockwise.) in this case, supply air to the lower port of the cylinder 8j, the abutment portion 8e ₁ of the piston rod 8j ₁ is protruded travel path direction front side of the claw member 8e Displace downward.
[0025]
In this state, the driving pulley is rotated, and the rotating shaft 2a of the table 2, which is the driven pulley, is rotated clockwise. Thereby, the fixed state of the protrusion 2b by the gripping device 8 is released, and the table 2 rotates. At this time, followed by the case of fixing the other protrusions in the gripping device 8 supplies air to the upper port of the cylinder 8j, the piston rod 8j ₁ by immersive top abutment 8e ₁ of the pawl member 8e Displace in the direction.
[0026]
In the above embodiment, as the device for fixing the projections 2b, 2c, 2d, and 2e of the table 2, the gripping device 8 for gripping the projections 2b, 2c, 2d, and 2e is used. It is not limited to. Any configuration may be used as long as the projections 2b, 2c, 2d, and 2e can be fixed at predetermined positions.
[0027]
Further, in the above embodiment, as the means for displacing the sliding member 8d, a displacement mechanism in which two cylinders 8h and 8i having different stroke lengths are connected is used, but the present invention is not limited to this. Any configuration may be used as long as the sliding member 8d can be displaced so that the claw members 8e, 8f face the passing positions of the protrusions 2b, 2c, 2d, 2e.
[0028]
Note that the present invention is not limited to the above embodiment, and can be variously modified as needed.
[0029]
【The invention's effect】
As is clear from the above description, according to the present invention, by stopping the fixing device at a position facing the projection to be fixed by the displacement means, other projections do not interfere with the fixing device during rotation of the turntable. Therefore, the turntable can be rotated at a stroke until the projection to be fixed comes to the fixing position, and the object can be positioned in a short time.
[Brief description of the drawings]
FIG. 1 is a partially cut-away top view showing an embodiment of a turntable device to which the present invention is applied. FIG. 2 is a side view with a part of the turntable device removed. FIG. 3 is a front view of a gripping device. FIG. 4 is a front view of the turntable device.
2 Table 8 Gripping device (fixing device)
8e, 8f Claw member

Claims (2)

A positioning mechanism for fixing a turntable at a plurality of predetermined positions, wherein a plurality of protrusions are provided on one surface of the turntable, and a fixing device for fixing the protrusions on one surface of the turntable is provided. Are arranged so that the directions viewed from the rotation center of the turntable are different from each other and the distances from the rotation center of the turntable are different from each other, and the fixing device is displaced in a direction perpendicular to the rotation axis of the turntable. A turntable positioning mechanism, comprising: a displacement unit that faces each of the plurality of protrusions. The fixing device includes a pair of claw members each having a contact portion that is located on each side of the projection in the traveling path direction with respect to the fixing position of the projection and that comes into contact with both surfaces of the projection in the traveling path direction. And a biasing means for biasing the contact portion of the claw member in the object direction, and when the protrusion has advanced to the fixing device position, the protrusion contacts the claw member on the rear side in the traveling path direction by the contact between the protrusion and the claw member. The abutting portion of the claw member is displaced in the opposite direction to the object against the urging force, and further advancing of the projection causes the abutting portion of the claw member on the front side in the traveling path to abut on the front surface of the projection in the traveling path direction. At the same time, the contact portion of the claw member on the rear side in the traveling path direction is displaced in the direction of the object by the urging force and abuts on the rear surface of the projection in the traveling path direction, and the projection is gripped and fixed by the contact portion of the two claw members. Is configured to lock the object in place. The positioning mechanism according to claim 1, characterized in that there.

Images