JPS6022601A - Index table device - Google Patents

Abstract

PURPOSE:To hold exactly and easily the indexing angle of an index table in particular by using the function specific to a reduction gear unit to an index device. CONSTITUTION:A motor shaft and a one-way clutch 13 are connected by means of a pressing spring and therefore a worm 19 is rotated reverse by a timing belt 22 to remove the backlash of the worm 19 engaged with a worm gear 20 and thereafter the gear 20 and a pinion 21 are cooperatively rotated, by which a gear wheel 5, a saw tooth wheel 6 and an index table 3 are rotated reverse until an angle determining wall 8 engages tightly with a detent pawl 24, then the table 3 is substantially stopped by the slipping effect of the pressing spring and immediately thereafter the reverse rotating circuit is opened upon termination of the timer set with a timer. On the other hand, the worm gear 20 of a reduction gear unit 17 is detained together with the pinion 21 by the worm 19, by which the detaining effect of preventing the table from moving in both backward and forward directions is generated. The effect of detaining and holding extremely tightly the table 3 at the prescribed stop angle is continued until the next forward rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an INTEX table device that uses a speed reduction device that has a +JU vehicle configuration in which the worm cannot be rotated in conjunction with the rotation of the worm gear side, and the worm gear is engaged with the worm driven by a reversible motor. This is related to.

Regarding conventionally known index tables, a wide variety of proposals have been made and implemented for angle indexing and indexing angle maintenance. The present invention is one of those proposals, and specifically aims to accurately and easily maintain the indexing angle of the index table by using the specific functions of the reduction gear mentioned above in the indexing device. This is the purpose.

An embodiment of the present invention will be described.

1 is an index table; 3 is an index table which is rotatably fitted onto a shaft 2 protruding from the top surface of the index table 1 and prevented from floating by a stopper 4; For example, a sawtooth ring 6 with 6 pieces or 1-124 pieces is fixed. As will be described later, the index table 3 rotates normally in the direction of the arrow lx to determine the angle, and after roughly determining the angle, rotates slightly back in the direction of the arrow y. Each of the SIN +1 wheels 6 has an engaging groove 7 consisting of a radial angle determining wall 3 facing the normal rotation direction of the arrow x of the index table 3 and an inclined sliding wall 9 on the front side thereof.
will be established.

10 is a bracket attached to an example of the index stand 1, and a reversible motor IJ and a speed reduction device 17 are attached to the bracket 1-.
and install. The reversible motor 11 is equipped with a case-type one-way clutch 1 having a timing cap groove 14 on the outer periphery of the morph shaft I2 protruding from the bracket 10 as shown in FIG.
3 and the spring box 15 are fitted one after another, and the pressing spring 1G inside the spring box 15 is brought into elastic contact with the case-shaped one-way launch 13. The reduction gear 17 has a shaft 18 protruding from the bracket 1-10.

The worm 19 and the worm gear 20 are meshed with each other, and the cutter provided on the outer periphery of the worm 19.
The twist angle of the worm screw groove 19a is made steep, and the angle of the gear 20a provided around the worm gear 20 is also adjusted accordingly.
To provide a device in which a worm 19 cannot be rapidly rotated even if a rotational force is applied to a worm gear 20 side. Sokuji worm gear 2
When a rotational force acts on the 0, the worm 19 becomes a braking wheel.

The shaft of the worm gear 20 protrudes from the upper surface of the bracket 10 and fixes a binion 21 that meshes with the float 5. The one-way clutch 13 and the worm shaft 18 are hooked together.

A shaft 23 is erected on the upper surface of the bracket 1-10, and one end of a lever 25 is pivotally supported on the shaft 23. The lever 25 is provided with a serrated pawl 24 that fits into the engagement groove 7,
Furthermore, a spring 2G is attached to the lever 25 to allow the locking pawl 24 to fit into the engagement f67.

When the index table 3 rotates forward in the direction of arrow 1jla, the retaining pawl 24 generates a movement of sliding on the sliding wall 9 and escaping from the engagement groove 7, thereby interlocking the lever 25. In conjunction with causing all or part of the escape from the groove 7, the lever 25 pushes the contact piece control piece 28 to switch the movable contact piece C from contact with the fixed contact A to contact with the fixed contact A. A switch 27 (FIG. 5) is provided which produces the following.

A drive circuit for a coil of a switching relay that switches the rotational direction of the reversible motor 11 is connected to one fixed contact a of the switch 27.
Connect to. LΔ motor 11 and index table 3
Toga iE? In this case, the movable contact piece C is connected to the fixed contact a.
However, when the retaining pawl 24 falls into the engagement groove 7, the movable contact piece C comes into contact with the fixed contact J: a b. The fixed contact is connected to the reversing circuit of the reversible motor 11. l
i-Circuit - After the set time of 5 seconds has elapsed, the reversal [Q
] A timer T with 1 action is provided for 1511 paths.

If the index table 3 is to be stopped at every 60° angle, and the number of 60 sawtooth rings (the number of locking grooves 7) is 6, then that is the number of Kerr grooves (number of locking grooves 7) that is sufficient.
is, for example, 24, in the above configuration, 15°
Since this causes the inconvenience that the index table 3 stops at every corner, the drive circuit described in MjJ is closed while the index table 3 rotates approximately 60 degrees. A timer T2 holding v8 is connected in parallel. This timer T2 can freely change the set time period, and the index table 3 can be set to 45, for example.
When it is desired to change the horn to stop, the set time is changed so that the drive circuit remains closed while the horn rotates approximately 45 degrees. In addition, a timer T3 is provided that determines the stop time of the index table 30 at a required angle. This timer T3 can also be replaced with a manual push button switch. The timer T2 starts expiring the set time at the same time as it is started by the timer 1-3 or the manual push tlJ switch.

When the stop time elapses or when the push button switch is pressed, the timer T2 starts expiring the set time and rotates the reversible mode 11 in the forward direction. Therefore, the stopper 24 slides on the sliding wall 9 and moves in the escape direction, opens the contact of the switch via the lever 25, closes the drive circuit together with the timer T2, and
4 falls into the engagement groove 7, the movable contact piece C comes into contact with the fixed contact piece C, but since the coil drive circuit is held by the timer T2, the reversible motor 1 does not switch to the reverse circuit.
1's normal rotation is successful. When the index table 3 approaches the next stop angle, the timer T2 finishes expiring the setting 115, the drive circuit is held only by the movable contact piece C of the switch 27 and the fixed contact a, and the stop claw 211 closes to the engagement groove 7. When the switching contact C contacts the fixed contact, the drive circuit is opened and the filter is not driven, so that the reversible motor 11 undergoes a short reverse rotation set in the timer T1 when the switching contact C contacts the fixed contact. At this time, the one-way clutch 13 does not reverse due to its performance, but since the motor shaft 12 and the one-way clutch 13 are connected by the pressure spring 16, the worm 19 is reversely reversed via the timing belt 22. Then, the worm gear 20 and pinion 21 are moved quickly from °ζ to remove the backlash of the gear 19 that is engaged with the worm gear 20, thereby moving the large gear 5, sawtooth ring 6, and index table 3. When the index table 3 is reversed and the angle determining wall 8 is tightly connected to the stopper claw 24, the index table 3 is substantially stopped by the slip action of the pressing spring 16, and immediately after that, the set time of the timer T1 is over. Opening the reversing circuit, on the other hand the worm gear 20 of the reduction gear 17 is connected to the pinion 21
At the same time, it is locked by the worm 19 to create a locking action that does not move in either the reverse direction or the forward direction, and a holding action that extremely tightly locks the index table 3 at a predetermined stopping angle.
At the next normal rotation, it will be inserted.

As clarified by the above description, the present invention is a speed reduction device in which a worm gear is engaged with a worm driven by a reversible motor with a float configuration in which the worm cannot be rotated by rotation from the gear side. The index table is configured to index the stop position of the index table and maintain the index position by using the switch. By reversing the gear from the worm side of the speed reducer, it is possible to index the stop position of the index table, which requires precision, and to maintain the position. Since it is made of

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention, Figure 2 is a side view, Figure 2 is a partially cutaway plan view, Figure 3 is an enlarged plan view of the main part, and Figure 4 is a one-way clutch. The enlarged cut-away plan view of the 13th part and Figure 5 are 8th and 1st spring diagrams that simply show the connections. 3 → Index table 5-・Large + ffQ 1lj
6-・Saw a1 wheel 7-Consolidation! L Ll・Angle determination′;
, 79→Sliding wall 10-・Plagen 1 11→Reversible motor I2→Motor shaft 17-・Reduction device 19→Wat 20→Worm gear 21-Binion 24→Stop pawl 25→Lever 26→Spring barrier 261 Fig. 4 110

Claims (1)

[Claims] The worm gear side has a float configuration in which the worm cannot be rotated in conjunction with the rotation of the worm gear, and a reduction gear device in which the worm gear is engaged with the worm driven by a reversible motor, and a large a'i force that meshes with a pinion that is interlocked with the worm gear. A serrated ring having an appropriate number of serrations is fixed to the index table, and an angular wall facing the normal rotation direction of the table is provided in a retaining groove formed by the serrations of the serrated ring. n;
A biasing means mounted on the lever that detects the tendency of the S-arranged locking pawl to fit into the engagement groove, and a reversible motor that changes polarity in a 1vI manner to detect the fitting of the locking pawl into the engagement groove. A switch for switching from forward rotation to reverse rotation is provided, and the forward rotation of the reversible motor causes the worm gear and the index table to rotate forward through the worm of the reduction gear, and the rotation is reversible in relation to the fitting of the pawl into the engagement groove. Reverse the motor, remove the bank lash by reversing the rotation of the worm, and then reverse the worm gear and index table to place the pawl against the angle determining wall of the engagement groove, and adjust its position. An INTEX table device is characterized in that it is held by a worm gear that is non-reversibly locked by a worm.