JP2007231995A - Index table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide an index table capable of stopping at multi-position by using fluid pressure as a driving source. <P>SOLUTION: This index table is provided with a piston (rack piston) having a rack tooth reciprocated by the fluid pressure, a pinion meshed and rotated with the rack piston, an index action cam clutch having an outer ring fixed in the inside of the pinion, a revolving shaft fixed by an index action cam clutch inner ring, a table fixed on an upper surface of the revolving shaft, and a cam clutch having a mechanism same with the index action cam clutch in order to prevent reverse rotation of the revolving shaft. A block is provided on the table for each indexing stop angle, and a stopper mechanism for stopping the block is disposed in a casing. When an elevating and lowering device is installed, a piston hole is machined in the casing, and a cylinder mechanism for elevating and lowering the whole of the index table is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a multi-position stop index table that uses fluid pressure as a drive source used in a transfer line, an assembly line, and the like.

    As an index table used for a conveyance line, an assembly line, and the like, an index table using an electric motor as a drive unit is generally used as a method for stopping the turning table at multiple positions.

    The index table can be easily set by performing numerical control of the motor with a controller even when there are a plurality of stop positions.

It is also possible to perform a plurality of controls such as forward / reverse control and turning speed control. However, since the motor and the control device are expensive, the equipment cost becomes very high.

    As a multi-position stop mechanism using fluid pressure as a driving source, one described in Japanese Patent Application Laid-Open No. 2002-126976 is known. However, a table locking mechanism after completion of the turning operation is required separately from the turning mechanism. .

    The index table has a structure in which the table can always rotate freely. Torque can be transmitted by moving the clutch mechanism up and down with the cylinder and meshing, and when it reaches the stop position, the locking pin rises and locks the table, while lowering the clutch mechanism, the stop position of the table is Although it is a mechanism that is locked by being forced into the pin hole, there are many lifting parts and the cycle time becomes long. In addition, the casing is complicated and expensive.

    These index tables have a mechanism that allows forward / reverse rotation control without recombination, but this function becomes an unnecessary function depending on the use of the user, and it is only a factor that unnecessarily increases the cost of equipment.

    Furthermore, there is no table lifting mechanism, and it is necessary to install a lifting device installed separately from the index table, or to change the control of the robot on the work side of the line provided for each stop position of the index table. is there.

Therefore, there is a demand for a simple and inexpensive index table that can be handled with the minimum necessary functions according to the application.
JP 2002-126976 A

    The problem to be solved by the present invention is to provide an index table with a high indexing accuracy that can be stopped at multiple positions using a fluid pressure as a driving source.

In the present invention, as means for solving the above-described problems, a piston (hereinafter referred to as a rack piston) that reciprocates rack teeth by fluid pressure, a pinion that meshes with the rack piston and rotates, and an outer ring is fixed inside the pinion. Similar to the indexing cam clutch, the pivot shaft fixed to synchronize with the inner ring of the indexing cam clutch, the table fixed to the upper surface of the pivot shaft, and the index cam clutch for preventing the rotation of the pivot shaft A cam clutch having a mechanism for transmitting torque to the inner ring only in one direction of rotation is provided.
The table is provided with a block for each indexing stop angle, and the casing is provided with a stopper mechanism for stopping the block.
The two cam clutches are provided with an outer ring and an inner ring like ball bearings, and torque is transmitted to the inner ring with respect to rotation of the outer ring in one direction. With respect to rotation in the transmission direction, the inner ring has a feature of performing idling.
In addition, in the case of an elevator device, a cylinder mechanism is provided that processes a piston hole in the casing and raises and lowers the entire index table.
Further, in the case of a hollow hole, a through hole is provided in the table and the pivot axis center line so that an electric wire, a tube or the like that is expected to be required for the work can be passed.

According to the embodiment of the present invention, the outer ring of the indexing cam clutch is fixed to the pinion, and the turning shaft is fixed to the inner ring, so that the forward / reverse rotation of the pinion synchronized with the forward / backward movement of the rack piston It was possible to convert it as a repeated operation of torque transmission to the shaft-idling, and as a table indexing operation.
Also, by fixing the outer ring of the cam clutch for reverse rotation to the casing and fixing the turning shaft to the inner ring, it becomes possible to use it as a cam clutch that performs idle operation when the rack piston moves forward and transmits torque when moving backward, It is possible to prevent reverse rotation of the swivel shaft and table due to the reaction force of the impact at the forward end of the rack piston, and factors that deviate the index stop angle, such as gear backlash, and improve indexing accuracy. did it.
In addition, as a result of having a structure that allows the table to move only in the direction requested by the user, it is possible to provide an index table with high indexing accuracy that can be stopped at multiple positions using fluid pressure as a drive source at low cost. It became.

    Embodiments of the present invention will be described below.

    Two horizontal through holes are formed in parallel to each other in the casing 1 of the index table of the present embodiment, and a head turning cylinder is formed by attaching head covers 4 and 5 to both end faces of the casing through holes. (Figure 2)

    The head cover 5 attached to the end face of the casing through-hole is provided with an absorber 10 for mitigating the impact at the time of forward and backward movement of the rack piston, and the mounting portion maintains the airtightness of the cylinder by a seal mechanism.

    A rack piston 2 is accommodated in the casing 1 so as to be able to reciprocate.

    The pinion 3 is installed in the casing so as to mesh with the rack piston 2, and the reciprocating motion of the rack piston 2 is converted into the forward / reverse rotational motion of the pinion 3.

    Inside the pinion 3, the outer ring of the indexing cam clutch 6 is fixed so that the torque is transmitted in the forward direction of the table, and the rotary shaft 9 fixed to the table 8 is fixed to the inner ring. The (Figure 1)

    Further, a cam clutch 7 for preventing reverse rotation is installed in the casing 1 so that the shaft center is coaxial with the shaft center of the pinion 3.

    The reverse rotation preventing cam clutch 7 has an outer ring fixed to the casing 1 and a rotating shaft 9 fixed to the inner ring so that the torque transmission rotation direction is the same as the indexing cam clutch 6.

    The table 8 is provided with a positioning block 11 for each indexing stop position, and a casing 12 has a stopper 12 for stopping the positioning block 11 incorporated therein so as to be lifted and lowered. (Fig. 5)

    Pressure ports 13, 13 ′, 14, 14 ′ for supplying fluid pressure to the rack piston 2 and pressure ports 15, 16 for supplying fluid pressure to the stopper 12 are provided on the side surface of the casing 1. (Fig. 3, Fig. 4-1)

    In addition, a cylinder sensor groove that can detect that the table 8 has been turned to a predetermined position by the operation of the rack piston 2 is provided. (Figure 3)

    In the case of an elevator mechanism, cylinder holes 21 are provided at both ends of the casing 1 so as to sandwich the table 8 therebetween.

    Pressure ports 18, 18 ′, 19, 19 ′ for supplying fluid pressure to the table lifting piston 17 are provided on the side surface of the casing 1. (FIGS. 6-2 and 6-3)

    In addition, a cylinder sensor groove is provided that can detect that the table 8 has moved up and down to a predetermined height by the operation of the table lifting piston 17.

    In the case of a hollow hole, a through hole is provided at the center of the table 8 and the pivot shaft 9. (Fig. 7)

    Next, the operation of the index table configured as described above will be described in the first embodiment of the present invention.

    When the fluid pressure is applied to the pressure ports 13 and 13 ′ formed on the side surface of the casing 1 from the reference state before the table turning shown in FIG. , And the pinion 3 rotates in the direction of the arrow in the figure in synchronization with the rack piston 2.

    An index operation cam clutch 6 is fixed inside the pinion 3, and the outer ring of the cam clutch 6 rotates in synchronization with the rotation of the pinion 3.

    Further, since the outer ring of the indexing cam clutch 6 transmits torque to the inner ring only in one direction of rotation, the outer ring transmits torque to the inner ring during rotation in the table turning direction, and the inner ring rotates in synchronization with the outer ring.

    Therefore, the turning shaft 9 fixed to the inner ring of the indexing cam clutch 6 and the table 8 fixed to the turning shaft 9 are determined by stopping the positioning block 11 by the stopper 12 by the advancement of the rack piston 2. It will turn the index angle. (Figure 4-2)

    The cam clutch 7 for preventing reverse rotation is fixed to the swing shaft 9 without transmitting torque to the inner ring because the outer ring of the cam clutch 7 is fixed to the casing 1 and does not rotate when the table 8 rotates. The inner ring is idling.

    When the table 8 is reversely rotated by the reaction force of the impact at the forward end of the rack piston 2 and when the backlash of the gear and the rack piston are moved backward, the table 8 is subjected to a reverse rotating force. In the working cam clutch 6, the inner ring rotates idly because the torque is in the counter-transmission rotation direction. In the reverse rotation prevention cam clutch 7, the outer ring is fixed to the casing 1 while rotating in the direction in which torque is transmitted. It does not rotate. Since the inner ring does not rotate like the outer ring, the table 8 can be locked as a result. (Fig. 4-3)

    Using this mechanism, the table 8 can accurately determine the stop position without moving back and forth from the indexing angle adjusted by the positioning block 11.

    In addition, the indexing angle of the index table can be arbitrarily set according to the position of the positioning block 11, and the turning direction of the table 8 is reversed by incorporating the mounting directions of the two cam clutches upside down. I can do it.

    A second embodiment of the present invention will be described with reference to FIGS.

    In the second embodiment, a table raising / lowering mechanism is provided in the structure of the first embodiment. FIG. 6 shows a state in which the raising / lowering mechanism is provided in the first embodiment. The same reference numerals as those in the first embodiment are used for the description, and the description thereof is simplified.

    When fluid pressure is applied to the pressure ports 18 and 18 ′ formed on the side surface of the casing 1 from the standard state of the table height shown in FIG. 6, the lifting piston 17 slides in the casing 1 to raise the casing 1. Thus, it is possible to obtain the table rising state shown in FIG.

    On the contrary, when fluid pressure is applied to the pressure ports 19, 19 ', the lifting piston 17 similarly slides in the casing 1, lowers the casing 1, and enters the table reference state shown in FIG.

    The table elevating mechanism is arranged at both ends of the casing 1 so as to sandwich the table 8, and also serves as a detent guide for the casing 1 in combination with elevating.

    In addition, by adjusting the piston stroke of the table lifting mechanism with the adjustment bolt 20, the tilt of the table 8 due to the piston stroke error can be adjusted.

It is front sectional drawing in Embodiment 1 of the index table which concerns on this invention. It is drive part sectional drawing in Embodiment 1 of the index table which concerns on this invention. It is an outline side view in Embodiment 1 of an index table concerning the present invention. It is drive part sectional drawing in Embodiment 1 of the index table which concerns on this invention, and is a reference | standard state figure before table turning. It is drive part sectional drawing in Embodiment 1 of the index table which concerns on this invention, and is a turning state figure of a table. It is drive part sectional drawing in Embodiment 1 of the index table which concerns on this invention, and is a completion state figure after table turning. It is side surface sectional drawing in Embodiment 1 of the index table which concerns on this invention. It is front sectional drawing in Embodiment 2 of the index table which concerns on this invention, and is a reference | standard state figure before a table raise. It is front sectional drawing in Embodiment 2 of the index table which concerns on this invention, and is a table rising state figure. It is a general view left view in Embodiment 2 of the index table which concerns on this invention. It is an outline right side view in Embodiment 2 of an index table concerning the present invention. It is front sectional drawing in Embodiment 3 of the index table which concerns on this invention. (With hollow holes)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Rack piston 3 Pinion 4 Head cover 5 Head cover 6 Indexing cam clutch 7 Reverse rotation prevention cam clutch 8 Table 9 Rotating shaft 10 Absorber 11 Positioning block 12 Stopper 13, 13 'Pressure port 14, 14' Pressure port 15 Pressure port 16 Pressure Port 17 Table Lifting Lifting Piston 18, 18 'Pressure Port 19, 19' Pressure Port 20 Stroke Adjustment Bolt 21 Hole for Lifting Cylinder

Claims (4)

In the multi-position stop index table that turns the table using fluid pressure as the drive source,
A piston with rack teeth, a pinion that meshes with the rack teeth, and a cam clutch that transmits torque to the inner ring only in one direction of rotation of the outer ring are installed for indexing the table and for preventing reverse rotation. A multi-position stop index table configured by fixing an outer diameter of a turning shaft installed on a line to the cam clutch inner ring.     The indexing position is determined by fixing a positioning block to the table for each indexing stop position and stopping the block by a stopper mechanism provided in the casing. Position stop index table.     The multi-position stop index table according to claim 1 or 2, wherein a cylinder mechanism for raising and lowering the table is built in the casing, and is also used as a guide for raising and lowering and rotating the casing.
4. A multi-position stop index table according to claim 1 that employs a hollow hole in the pivot shaft.

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