JPS6044249A - Position indexing device - Google Patents

Abstract

PURPOSE:To enable a position indexing means to be singly removed without causing any necessity for removing a driving motor, by connecting one of the main shafts in the driving motor of both-sided shaft to a divided structure and the other of the main shafts to the position indexing means. CONSTITUTION:A driving motor 1 of both-sided shaft has an upper main shaft 2 and a bottom main shaft 3, and a driving gear 5 is mounted to the main shaft 2. A divided structure 6 such as a rotary table provides a rotary shaft 7 secured to the divided structure 6 and gear 8 both secured to the rotary shaft 7 and meshed with the gear 5. A bottom part of the motor 1 is coated with a casing 12, and the main shaft 3, protruding to the inner of the casing 12, connects a position indexing means 13. The position indexing means 13, when its work of repair, inspection, etc. is operated, enables the work to be performed by only removing the casing 12 without causing any necessity for removing the driving motor itself.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position indexing device, and more particularly to a position indexing device that can be easily maintained.

2. Description of the Related Art Conventionally, devices with various structures have been used to index the position of a rotary table or the like of a machine tool. For example, as a specific example, a rotary table is rotatably supported with respect to a base, and the rotary shaft of this rotary table is rotationally driven by a drive motor via a Geneva mechanism to determine a rough rotational position. There is a structure in which the rotational position is adjusted by inserting a positioning dowel pin provided on the base side into a dowel hole provided on the rotating shaft side. In addition, in order to further improve the positioning accuracy of the above device, the rotary table can be moved up and down relative to the base, and rings are attached to the upper surface of the base and the lower surface of the rotary table, respectively, and these rings are Compling teeth that engage with each other are formed on opposing surfaces, and when the rotary table is raised, positioning is performed using the Geneva mechanism and dowel pins and dowel holes.When the rotary table is then lowered, both compling teeth engage and the rotary table is may be positioned at a predetermined rotational position.

By the way, in the above-mentioned conventional position indexing device, a position indexing means such as a Geneva mechanism is interposed between the drive motor and the table rotation axis, or for this reason, in the above device, the Geneva groove of the Geneva mechanism When replacing the Geneva bin when it becomes worn or damaged, it is necessary to remove not only the Geneva mechanism itself but also the drive motor. Furthermore, when the dowel pin or dowel hole becomes worn or damaged and is to be replaced, it is often necessary to similarly remove the drive motor. As described above, the conventional position indexing device has the disadvantage that the drive motor needs to be removed for repair or inspection, which requires a lot of effort for its maintenance.

This invention has been made in view of the above, and its purpose is to provide a position indexing device that can be easily maintained without the need to remove the drive motor even when the position indexing means is replaced. It is about providing.

The position indexing device of the present invention which meets the above object is constructed by having one main shaft of a double-shaft drive motor connected to the object to be indexed, and the other main shaft connected to position indexing means.

As mentioned above, one main shaft of the double-shaft drive motor is connected to an object to be indexed such as a rotary table, and the other main shaft is connected to the position indexing means, so that the position indexing means can be used by removing the drive motor. Therefore, maintenance work can be easily performed.

Next, specific embodiments of the position indexing device of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a double-shaft drive motor having low speed and high torque characteristics such as a tocoroid motor or a gear motor, and has an E section main shaft 2 and a lower main shaft 3 at the upper and lower parts, respectively. A drive gear 5 is attached to 2 via a key 4.

The object 6 to be indexed, such as a rotary table, has a rotating shaft 7 fixed to the object 6 to be indexed, and a gear 8 fixed to the rotating shaft 7 and meshing with the drive gear 5. The rotation of the upper main shaft 2 causes the drive gear 5, gear 8, and rotation shaft 7 to
The object to be indexed 6 can be driven one rotation through each of them. Further, the rotating shaft 7 is movable up and down with respect to the heath 9 that supports the rotating shaft 7 and the object to be indexed 6, and rings 10 are provided on the upper surface of the base 9 and the lower surface of the object to be indexed 6, respectively. .11 are attached and these rings 10
．． Coupling teeth that engage with each other are formed on opposing surfaces of 11. It is assumed that the rotating shaft 7 is driven by a piston (not shown) of a hydraulic cylinder and moves up and down.

The lower part of the double-shaft drive motor 1 is covered by a casing 12, and the lower main shaft 3 projects and extends inward of the casing 12. Since a position indexing means 13 is connected to this lower main shaft 3, this point will be explained next.

This position indexing means 13 includes a cam 14 attached to the lower main shaft 3, an L-shaped lever 15 that swings in accordance with the shape of the cam 14, and an L-shaped lever 15 that swings in accordance with the swing of the L-shaped lever 15. It is comprised of a flow rate directional control valve 17 that moves the spool 30 and controls the flow rate of fluid supplied to the double-shaft drive motor 1. The above cam has a key 18 and a key 18 on the lower main shaft 3.
This cam 1 may be fixed by cam 19.
Reference numeral 4 is a substantially disc-shaped member disposed concentrically with the axis of the lower main shaft 3, and a part of its circumferential side is cut into a gentle arc shape to form a tapered part 20. A recess 21 extending radially inward is formed approximately in the circumferential center of the recess 21 . However, the peripheral side of this cam 14 is connected to the lower main shaft 3.
an arcuate portion 22 disposed concentrically with the arcuate portion 2;
The tapered portion 2 has a tapered portion 2 ( ) that is connected to both ends of the tapered portion 2 and gradually moves toward the center thereof, and a recessed portion 21 located approximately at the center of the tapered portion 20 . The above-mentioned lever 15 has two arms 23, 24 extending substantially perpendicularly, and is pivotally attached to the side wall of the casing 12 at the intersection thereof. A hair ring 25 is attached to the tip of one arm 23.
A roller 26 is rotatably supported through the cam 14 so that the roller 26 can roll on the circumferential side of the cam 14.

The recess 21 provided in the cam 14 has a shape into which the second roller 26 can fit. In addition, the I-type lever 15
The tip of the other arm 24 is pivotally connected via a pin 25 to a rod 27 that is integrally formed with the tip of the spool of the flow direction control valve 17 .

As shown in FIG. It has a pump boat P connected to a discharge line 31 of a hydraulic pump (not shown), a tank boat 1-T connected to a tank line 32, and further connected to the actuator side. It has three balls l-A, B, and M. Also, spool 30
A spring 33 is interposed between the rear end (right side in Figure 5) and the rear end of the main body 28, and is configured to constantly press the spool 30 toward the tip (left side in Figure 5). .

A spring chamber 34 in which this spring 33 is housed,
It communicates with the second pyro, tobot PL2. A pilot chamber 35 is provided on the opposite side of the spring chamber 34, and when fluid is introduced into the pilot chamber 35, the fluid pressure in the pilot chamber 35 and the spring force are relative to each other. It has been made to look like this. Note that the pilot chamber 35 is in communication with the first pilot chamber 1-PLl. and the first and second pilot bows 1-
PLl and PL2 are connected to the discharge line 31 and tank line 32 via a forward/reverse switching valve 38 by lines 36 and 37. That is, either the first or second pilot bow 1-1, for example PL
When I is in communication with the discharge line 31, the other pilot boat circle 72 is in communication with the tank line 32.

The connection state of each bow 1-P, T and AB, M in the flow direction control valve 17 is as shown in FIG. In a neutral state (the state shown in FIG. 5) in which the spool 30 is pressed by the force of the spring 33 and moved to the distal end side (the state shown in FIG. 5), the flow rate directional control valve 17 is located at the symbol position S1. Then, pump ball l-P is connected to ball 1-A,
Tank boat 'r communicates with boat B and boat M, respectively. On the other hand, when the fluid pressure of the discharge line 31 is introduced into the pilot chamber 35 and the spool 30 is moved back to its maximum position against the force of the spring 33, the flow direction control valve 17 is activated. Located at symbol position S2, pump P communicates with boat 13, and tank boat T communicates with boats Δ and M, respectively. Furthermore, in the process of the spool 30 gradually moving toward the tip side from this state, the flow direction control valve 17 is located at the symbol position S3, and the land 39.4 of the spool 30 is located at the symbol position S3.
0 taper part and corner part 41.4 of spool sliding chamber 29
The flow path of the variable orifice 16 formed between the two is gradually narrowed. Note that when the spool 30 moves to the vicinity of the tip, 1. Flow direction control valve 17
is located at symbol position S4, and boat A is temporarily blocked.

The boats A, B, and M are connected to the actuator side as shown in FIG. A hydraulic cylinder (not shown) that moves the shaft 7 up and down is connected via a line 43, 44, and is also connected to the shaft 1-B.
, M connects the above-mentioned double-shaft drive motor 1 via lines 45 and 46.
– is connected to. In addition, a line 45.4G connecting the above-mentioned bows 1-B, M and the double-shaft drive motor 1 includes an electromagnetic switching valve 4 for switching the double-shaft drive motor 1 between normal rotation and quick drying.
7 is interposed. In addition, in FIGS. 2 and 5, 48 is attached to the rear end of the spool 30 and extends rearward through the main body 28 of the flow direction control valve 17, and 49 indicates this one piece 48. A dog 50 attached to the rear end is a switch operated by the dog 49, which detects the state in which the spool 30 is most advanced, that is, the state in which position indexing has been completed. - It is for the purpose of

Next, the operating state of the above-mentioned position indexing device will be explained. First, the roller 26 provided on one arm 23 of the mold lever 15 fits into the four parts 21 of the cam 14 attached to the lower main shaft 3, and the double-shaft drive motor 1 stops at the index rotation position. I will explain the state I am in. In this case, the forward/reverse switching valve 38 is located in the state shown in FIG.
1] 12 to the spring chamber 34, and the electromagnetic switching valve 47 is also located at the neutral position. In this state, the spool 30 is pressed toward the distal end by the force of the spring 33 and the fluid pressure within the spring chamber 34. This force is transmitted to the roller 26 via the rod 27 at the tip of the spool 30 and the L-shaped lever 15, and the roller 27 is fitted into the recess 21 of the cam 14 by this force. Also, since the flow directional control valve 17 is located at the symbol position S1, the fluid in the discharge line 31 is transmitted to the boat A via the pump boat P, while the ports B and M are transferred to the tank via the tank boat T. It connects to line 32. That is, fluid supplied from port 8 is transmitted to a hydraulic cylinder (not shown) via line 43, pushes down the indexed object 6 such as a rotary table, and causes the indexed object 6 side and the hearth 9 side The coupling teeth provided on the two shafts are engaged with each other to hold the indexed rotational position, and both ports B and M are opened to the tank line 32, so that fluid can be supplied to the double-shaft drive motor 1. The motor 1 is kept in a stopped state.

When performing position indexing from the above state, the forward/reverse switching valve 38 is first moved to the switching position.

When the forward/reverse switching valve 38 is positioned in the switching position in this way,
The fluid in the discharge line 31 is led to the pilot chamber 35 via the pilot line 37 while the fluid in the spring chamber 34
is opened to the tank line 32 via the virofloft line 36. As a result, the spool 30 retreats to the rear end against the force of the spring 33. Along with that, L
The mold lever 15 rotates, and the roller 26 moves upward to remove salt from the recess 21. Also, like this, spool 3
As a result of the movement of 0, the flow directional control valve 17 is located at the symbol position S2, the discharge line 31 communicates with the boat B via the pump boat P, while the boats A and M communicate with the tank line via the tank port T. It connects to 32. That is, the fluid in the discharge line 31 is transmitted to the hydraulic cylinder (not shown) via the bow) B and the line 44, thereby pushing the object 6 to be indexed, such as the rotary table, and generating a force of 7 The engagement between the pulling teeth is released, and an unclamping completion signal transmitted by this release causes the switching valve 47 to be in the normal rotation position, and the indexed body 6 is in a state where it can freely rotate.

Furthermore, the fluid in the discharge line 31 is transmitted to the double-shaft drive motor 1 via the boat M and the line 45, and the other line 46 communicates with the tank line 32 via the boat M, so that the double-shaft drive motor 1, it rotates rapidly, and as a result, the indexed body 6 is rotationally driven.

Next, after a predetermined period of time has elapsed after the switching of the forward/reverse switching valve 38, the forward/reverse switching valve 38 is returned to the neutral position again. This return operation may be performed by switching the forward/reverse switching valve 38 in response to a signal output from the angle detector immediately before the index position, or by using a timer or the like. When the forward/reverse switching valve 38 is returned to the neutral position in this way, the fluid in the discharge line 31 is guided into the spring chamber 34 again, and the pilot chamber 35 is communicated with the tank line 32, so that the spool 3
0 is the fluid pressure in the spring chamber 34 and the spring 33
The force causes the L-shaped lever 15 to move toward the tip and rotate. However, the roller 26 at the tip of the above-mentioned lever 15 has escaped from the recess 21 of the cam 14, and the arc-shaped portion 22 of the cam 14 is located at the position of the roller 26. It comes into contact with the arcuate portion 22 and rolls. As a result, the spool 3 of the flow direction control valve 17
0 will be held in the middle without moving to the most extreme position. In this manner, when the flow rate directional control valve 17 is located at the symbol position S3,
The flow path of the variable orifice 16 formed between the tapered part of the land 39.40 of the spool 30 and the corner part 41.42 of the spool sliding chamber 29 is such that the spool 30 is
It is narrower than the state located at the end, so the flow rate of the fluid sent to the double-shaft drive motor 1 is reduced, and the indexed object 6, such as the rotary table, is driven at a lower speed than at the beginning of rotation. There is.

When the lower main shaft 3 of the double-shaft drive motor l rotates further and the tapered portion 20 of the cam 14 comes into contact with the roller 26, the arm 23 of the L-shaped lever 15 on the side where the roller 26 is provided As it gradually approaches the lower main shaft 3, the other arm 24 rotates in a direction away from the flow direction control valve 17, and the spool 30 gradually moves toward its tip. As a result, the flow direction control valve 17 is located at the symbol position S4, and the variable orifice 16 formed between the tapered part of the land 39.40 of the spool 30 and the corner part 41.42 of the spool sliding chamber 29
The flow path is further narrowed, the flow rate of the fluid sent to the double-shaft drive motor 1 is further reduced, and the rotational speed of the indexed object 6 such as the rotary table is reduced, and the port A is blocked in this state. be done.

Thereafter, when the recess 21 of the cam 14 is located at the position of the roller 26, the roller 26 is fitted into the recess 21, the L-shaped lever 15 is rotated greatly, and the spool 30 of the flow rate directional control valve 17 is rotated. Protrudes to the most extreme position.

In this state, as described above, the flow direction control valve 1
7 is again located at the symbol position S1 and the pump board 1-
P communicates with the boat 1-A, and the tank boat T communicates with ports B and M, so the fluid line 43 of the discharge line 31
The indexed object 6 such as a rotary table is pushed down by a hydraulic cylinder (not shown) through the
The cambling teeth provided on the sides engage with each other to hold the indexed body 6 at a predetermined rotational index position. Also, at this time, as mentioned above, the line 45 passing to the double-shaft drive motor 1
．． 46 are both open to the tank line 32, so the drive of the double-shaft drive motor 1 is stopped.

This position indexing device is capable of indexing the rotational position of the object to be indexed 6 as described above, but in the above device, the upper main shaft 2 is moved to the object to be indexed by using the double-shaft drive motor 1. Since the output body 6 is provided with a position indexing means 13 such as a cam 6, a mold lever 15, a flow direction control valve 17, etc. on the lower main shaft 3,
When repairing or inspecting the position indexing means 13, there is no need to remove the drive motor itself as in the past.
The work can be carried out simply by removing the casing 12, and since only the position indexing means 13 can be removed, maintenance work can be carried out easily. Furthermore, when the position indexing means 13 is constituted by the cam 14, the L-shaped lever 15, the flow direction control valve 17, etc. as described above, when the position indexing by the Geneva mechanism is completed as in the conventional device, a signal is sent. A series of signals is generated, in which the positioning dowel pin is actuated based on this signal, and then, when the positioning dowel pin operation is completed, this operation completion signal is further emitted, and the hydraulic cylinder is actuated based on this signal. There is no need for transfer at all, and a series of position indexing operations up to the point where the roller 26 fits into the recess 21 can be performed continuously, making it possible to significantly shorten the position indexing time. It is.

Although one embodiment of the position indexing device of the present invention has been described above, the position indexing device of the present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, if it is necessary to index a plurality of positions, a plurality of recesses corresponding to each index position may be provided on the circumferential side of the cam.

In addition to the above, various types of position indexing means can be used, such as a known Geneva mechanism or engagement between a positioning dowel pin and a dowel hole. It may be provided on one main shaft of the shaft drive motor.

Further, the double-shaft drive motor is not limited to the hydraulic type as described above, but may also be an electric drive motor.

The position indexing device of this invention is constructed as described above, and therefore, according to the position indexing device of this invention,
One main shaft of the double-shaft drive motor is connected to the object to be divided, such as a rotary table, and the other main shaft is connected to the position indexing means, so the position indexing means can be removed independently without removing the drive motor. This makes it possible to perform maintenance work easily.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the position indexing device of the present invention, FIG. 2 is a cross-sectional view taken along line nn in FIG. 1, and FIG.
The figure is a vertical sectional view (along line 111-II) in Figure 2, and Figure 4 is an explanatory diagram of the +J/ll rotation pressure applied to the position indexing device.
FIG. 5 is a longitudinal sectional view showing a flow direction control valve used in the above device, and FIG. 6 is an explanatory diagram of the connection state of each port of the flow direction control valve. 1...Double shaft drive motor, 2.3...Main shaft, 6...
Indexed object, 13... position indexing means.

Claims (1)

[Claims] 1. One main shaft (2) of the double-shaft drive motor (1) is connected to the indexed object (6), and the other main shaft (3) is connected to the position indexing means (
13) A position indexing device connected to.