JPH023412Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a split positioning device that is used as a component of various machine tools, assembly machines, and the like.

The configuration of the split positioning device poses few problems and is easy to design if the split positioning operation can be performed at a relatively low speed. However, when dividing operations and stop positioning are repeated at high speed and high precision is required,
Due to factors such as the inertia of the movable part, residual vibration is likely to occur when the movable part is stopped, and it has been extremely difficult to eliminate the influence of this residual vibration and perform high-speed, high-precision positioning. For example, in a mechanical positioning mechanism that performs high-speed split positioning, there are limits to increasing the rigidity of the mechanical system, and there are also limits to reducing the bumpiness and elastic deformation of the drive system. At high-speed divisions above a certain level, residual vibration becomes noticeable when stopped. Furthermore, in the case of relatively light loads, configurations in which split positioning is performed using only a pulse motor are often seen, but even in this case, residual vibration is known to occur when high-speed splitting and stopping are performed. . Electrical measures such as adding a braking resistor to the motor drive circuit or changing the drive circuit from a unipolar transistor circuit to a bipolar transistor circuit have been taken as measures to reduce residual vibration when a pulse motor stops. However, the effect is not sufficient.

This idea was devised in view of the above-mentioned conventional problems, and its purpose was to eliminate the effects of residual vibration when the pulse motor stops, even with a relatively simple configuration that combines a pulse motor and a mechanical positioning mechanism. It is an object of the present invention to provide a division positioning device that can perform division positioning at high speed and with high precision.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

In the embodiment described below, the present invention is applied to a spindle device of an automatic lathe for complex machining. This multi-tasking automatic lathe rotates the main spindle at high speed to perform normal turning processing, then quickly stops the main spindle, disconnects it from the drive motor, connects the main spindle to a separate positioning device, and then While the main spindle is indexed at high speed by a split positioning device, secondary processing is performed on the workpiece using a single cutter or the like.

The spindle device shown in FIG. 1 includes a headstock 2 that is guided so as to be slidable back and forth on a spindle bed 1, a spindle 3 that is supported by the spindle 2, and a headstock that is located at the rear end of the spindle 3. A drive shaft 5 is supported on the rear part of the headstock 2 via a bearing 4, and a mounting frame 6 is mounted on the top of the headstock 2.
The pulse motor 7 of the divided positioning device is mounted via a pulse motor 7, and an alternating switching clutch 8 is provided on the rear outer periphery of the main shaft 3.

A pulley 9 is pivotally attached to the outer periphery of the drive shaft 5,
A belt 10 suspended from this pulley 9 is connected to a motor with a brake (not shown) for driving the main shaft.

Further, a pinion 12 is connected to the output shaft of the pulse motor 7, and the pinion 12
The rotation of the main shaft 3 is transmitted via an idle gear 13 to a drive gear 14 disposed on the same axis around the outer periphery of the main shaft 3.

The clutch 8 has a key 15 on the rear outer periphery of the main shaft 3.
Clutch cone 1 slidably connected via
6 and the shaft portion 14a of the drive gear 14 on the opposite side.
is arranged in a loosely fitted state, and this shaft portion 14a
and a bearing 17 on the outer periphery of the shaft portion 16a of the cone 16.
A clutch case 18 is arranged around the outer periphery of the clutch case 18, and by sliding the clutch case 18 back and forth, the gear 14 and cone 16 are slid back and forth.

A tapered clutch 14b is formed on the inner peripheral surface of the drive gear 14, and a clutch cone 19 is fixed to the outer periphery of the main shaft 3 facing the clutch 14b. Further, the drive shaft 5 facing the clutch cone 16 on the rear side
A tapered clutch 9a is formed on the inner surface of the pulley 9, and by moving the clutch case 18 back and forth via a switching mechanism (description is omitted), one rotational power is transmitted to the main shaft 3. At the same time, it is separated from the rotational drive system on the other side.

In the above configuration, the clutch case 18
When the clutch cone 16 is slid forward, the clutch cone 16 is separated from the shoe 9a of the pulley 9, and the main shaft 3 is separated from its high-speed rotation drive system. At the same time, the shoe 14b of the drive gear 14 engages with the clutch cone 19, and the main shaft 3 is connected to the divided positioning device of the present invention using the pulse motor 7 as a driving source.

Next, Fig. 1 shows this divided positioning device.
This will be explained with reference to FIGS. 2 and 3. A driving gear 14 rotated by the pulse motor 7 via a pinion 12 and an idle gear 13 has a dividing plate 26 coaxially fixed to its front surface. This dividing plate 26 has positioning W grooves 26a carved at equal pitches in accordance with a preset number of divisions. Also, a positioning lever 2 for engaging the V groove 26a of the dividing plate 26 and mechanically fixing it.
8 is pivotally mounted coaxially with the upper idle gear 13. The positioning lever 28 has a V-shaped fork, one end 28a of which is disposed on the peripheral surface of the dividing plate 26, and a clutch pawl 30 that engages with the V-groove 26a is provided at its tip. The positioning lever 28 is connected to the clutch pawl 30 by a spring 29.
is biased in the direction of contacting the circumferential surface of the dividing plate 26. The other end 28b of the positioning lever 28 is adapted to be connected to a cam lever mechanism for actuating the lever 28.

The cam lever mechanism is arranged on the side of the headstock 2 in parallel with the cam shaft 27 for commanding division.
and a cam plate 31 fixed to this camshaft 27,
A lever shaft 33 rotatably supported by a bearing frame 32 and a tip of a cam follower lever 34 fixed to one end of this lever shaft 33 are connected to the cam plate 3.
1, and a spring 35 that is fixed to the other end of the lever shaft 33 and engaged with the other end 28b of the positioning lever 28 in conjunction with the cam plate 31 and the cam follower lever 34. and a drive lever 36 for operating this.

In the state shown in FIG. 4, the clutch pawl 30 of the positioning lever 28 fits into the V-groove 26a of the dividing plate 26, thereby positioning and fixing the dividing plate 26. From this state, the cam plate 31 is rotated in the direction of the arrow, and as a result, the cam follower lever 34 and the drive lever 3
6 are respectively rotated in the direction of the arrow, and as a result, the positioning lever 28 is also rotated in the direction of the arrow by the drive lever 36, the clutch pawl 30 is disengaged from the V groove 26a of the dividing plate 26, and the locking of the dividing plate 26 is released. and can be rotated. In this state, the pulse motor 7 is driven by a predetermined number of pulses to rotationally displace the dividing plate 26 by one pitch of the V-groove 26a. At that time, the dividing plate 2 is moved until the clutch pawl 30 comes off the first V groove 26a and can fit into the next V groove 26a.
When 6 is rotationally displaced, the lever mechanism operates,
The clutch pawl 30 is brought into pressure contact with the peripheral surface of the dividing plate 26. Then, when the dividing plate 26 rotates by a predetermined angle, the clutch pawl 30 fits into the V groove 26a due to the elastic force of the spring 29, and the dividing plate 26
will be mechanically and forcibly positioned and fixed. In this state, the excitation current of the pulse motor 7 is cut off to prevent unnecessary power consumption and heat generation.

In order to control the above-mentioned operation timing, a proximity switch 37 responds to the position of a lever 38 fixed to a lever shaft 33, and a proximity switch 3 responds to the position of a lever 40 fixed to a positioning lever 28.
9 is provided. An output signal is generated from the proximity switch 39 when the clutch pawl 30 fits into the V-groove 26a and the positioning of the dividing plate 26 is completed. A main shaft division command signal is generated from the proximity switch 37 when the clutch pawl 30 is completely removed from the V-groove 26a and the positioning is released.

The divided positioning device configured as described above is controlled by a control circuit (not shown) as follows. In the initial state, the dividing plate 26 is positioned. In this state, when the camshaft 27 rotates, the lever 38 operates, and the main shaft division command signal is applied, a predetermined number of drive pulses are sequentially applied to the pulse motor 7. Accordingly, the dividing plate 26 is rotationally displaced to a certain extent, and the clutch pawl 30
When the clutch pawl 30 is ready to fit into the next V-groove 26a, the clutch pawl 30 comes into pressure contact with the circumferential surface of the dividing plate 26. When a predetermined number of drive pulses have been applied to the pulse motor 7, the clutch pawl 30 fits into the V-groove 26a at that position, and the dividing plate 26 is mechanically positioned and fixed with high precision. Here, as mentioned above, when the pulse motor 7 is stopped, residual vibration is generated due to the inertia of the movable parts including the main shaft 3, the dividing plate 26, etc., but in the device of the present invention,
Almost at the same time as the pulse motor 7 is stopped, the clutch pawl 30 fits into the V-groove 26a and mechanically fixes the dividing plate 26, so the residual vibration is suppressed and instantaneous highly accurate positioning is achieved. I can do it.
Further, the control circuit responds to an AND signal of a completion signal indicating that a predetermined number of drive pulses have been applied to the pulse motor 7 and a positioning completion signal from the proximity switch 39, and controls the excitation current to the pulse motor 7. cut off. This prevents the motor 7 from generating heat.

It should be noted that the divided positioning device of the present invention is of course not only applicable to the spindle device of the multi-tasking automatic lathe shown in the embodiment, but can also be applied to various machine tools, assembly machines, etc.

As explained in detail above, the split positioning device according to the invention includes a split plate driven by a pulse motor, a positioning mechanism that engages with the split plate to mechanically position and fix the split plate, and a positioning mechanism that mechanically positions and fixes the split plate by engaging with the split plate. to drive the dividing plate by a predetermined amount, positioning and fixing the dividing plate by the positioning mechanism,
Since it is equipped with a control circuit that then cuts off the excitation signal of the pulse motor, high-speed division is possible with the pulse motor, and the residual vibration of the movable part that occurs when the pulse motor stops is eliminated by the mechanical positioning mechanism. It is possible to perform high-precision positioning instantly, with almost no occurrence, and the positioning mechanism can correct even split positions that do not correspond to the excitation phase of the pulse motor, ensuring high precision regardless of the split position. can be positioned.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main spindle device of an automatic lathe for complex machining using the divided positioning device of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a sectional view taken along the line 3-3 in FIG. 7...Pulse motor, 26...Dividing plate, 26a
... V groove, 28 ... Positioning lever, 30 ... Clutch pawl.

Claims (1)

[Scope of utility model registration request] A multi-tasking automatic lathe has a rotation dividing plate for the main shaft installed via a clutch device on the main shaft, and the dividing plate is divided and positioned by a combination of a pulse motor and a mechanical positioning mechanism, wherein A divided plate that is driven, a positioning means that mechanically engages with the divided plate to position and fix it, and another drive motor that is used as a drive source to disengage the positioning means from the divided plate. a command cam, a switch that gives a division command and starts operation of the pulse motor by the operation of the positioning means operated by the division command cam, and a switch that starts the operation of the pulse motor when the positioning means positions and fixes the division plate; A split positioning mechanism comprising: a switch that cuts off the excitation current of the motor and stops the pulse motor.