JPS6332585B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to
This invention relates to an automatic feed handle that is attached to a table feed device, a machine tool tool or workpiece feed device, etc.

[Conventional technology]

Conventionally, as a feeding device to which this kind of feeding handle is attached, for example, as shown in FIG.
A handle c is attached to one end of the feed shaft b rotatably supported by a bracket a, and a threaded portion d of the feed shaft b, a ball screw f1 attached to the bracket a, and a ball screw f2 attached to the table e. and the above handle c.
The above operation causes the table e to slide according to a guide not shown in the drawings, and the fine movement is performed while changing the gear ratio depending on the lead and lead difference of the pair of ball screws f1 and f2, and the rapid movement is performed as described above. There is a system in which the feed is performed in accordance with the lead of the ball screw f2, and the feed amount is read from a scale provided on the outer periphery of the handle.

Furthermore, in order to perform rapid feed efficiently, a method has been proposed in which a servo motor is attached to the feed shaft on the opposite side of the handle, and the rotation speed of this servo motor is fed back by an encoder to adjust the feed amount.

[Problem that the invention seeks to solve]

However, in a manual feed device operated by operating a handle, there are problems in that it is difficult to accurately finely move the feed or determine a feed amount according to the purpose, and rapid feed also requires a great deal of effort.

In addition, in automatic feed devices that use servo motors, the required torque cannot be obtained only with the torque of the servo motor itself, and a gear reduction mechanism is required to increase this torque. In addition to having a complicated structure, in order to increase the splitting accuracy of the encoder used, the rotary plate that is attached to the rotating shaft of the servo motor and detects its rotation speed must be made larger, which naturally increases the size of the encoder. This increases the load on the servo motor itself and makes it expensive, and there is a limit to increasing the accuracy of this encoder division, resulting in the problem that fine, high-precision feed cannot be obtained.

Furthermore, if we consider micro-high-precision feeding, it is possible to use a motor that is normally called a step motor, but this step motor cannot obtain large torque, and the X/Y table feeding mechanism and machining It cannot be used in automatic feeding devices that require large torque, such as machine tools or workpiece screw shafts.

In conventional automatic feeders, the servo motor is installed on the opposite side of the feed shaft from the handle, so a special space is required to install the servo motor, and this space must be secured. There was also the problem that the size of the equipment was unnecessarily large.

[Means and actions for solving problems]

In view of the above, the present invention was proposed in order to solve each of the above-mentioned problems. An outer ring is attached to the side periphery, and a rotor having a large number of teeth is attached to the inner periphery of this outer ring, and a plurality of excitation parts are provided inside the inner periphery of the rotor with a predetermined gap maintained from the rotor. A stator is provided, and when power is supplied, the rotor is rotated or held by the magnetomotive force of the excitation part of the stator to finely feed and hold the device to be fed, and when power is not supplied, manual feeding is performed by the handle body. This is an automatic feed handle that can be used selectively.

In principle, the automatic feed handle of the present invention incorporates a linear motor mechanism consisting of a rotor and a stator in the handle body itself, which is attached to the feed shaft of the feed device. It may be of any type, permanent magnet type, permanent magnet type, or a combination of these types, but in order to obtain high precision and high thrust, it is preferable to have a permanent magnet and excitation core at the tip facing the teeth of the rotor. A composite type including a plurality of sets of electromagnets each having a plurality of inductor teeth is preferable.

In addition, in the automatic feed handle of the present invention, the method of exciting the stator excitation part of the linear motor mechanism incorporated in the handle body is to constantly supply current to only one phase of the stator excitation part to perform step feed. It may be a one-phase excitation method,
Alternatively, a two-phase excitation method may be used in which current is constantly passed through two phases to the stator excitation section to perform step feeding, but preferably, it is possible to obtain a high thrust,
Moreover, a two-phase excitation method is preferable because it has small damped vibration and can respond to a wide frequency range.

Furthermore, in the automatic feed handle of the present invention,
A linear motor mechanism for rotating the handle by attaching an outer ring to the periphery of the back side of the large-diameter handle body, attaching a rotor with a large number of teeth to the inner circumference of the outer ring, and disposing a stator on the inner circumference of the rotor. A scale plate is provided on the front of the handle body to read the feed amount, and a mark is provided on the feeder body side to read the feed amount, thereby making it possible to aim for accurate fine feed. You can also do this while checking.

The automatic feed handle of the present invention is attached to one end of the feed shaft of an automatic feed device, and connects a rotor with a large number of teeth and a stator with a plurality of excitation parts through an outer ring attached to the large diameter handle body. By applying a pulse current of a predetermined frequency to the excitation part of the stator, a magnetic force of a predetermined strength is intermittently generated in the excitation part of the stator. The above-mentioned rotor is rotated by the handle body, and the feed shaft is rotated through the handle body to feed the device to be sent, such as an X/Y table, to a predetermined position, and the stator is excited until the work is completed at the predetermined position. The device to be sent is held by the magnetomotive force of the part.

According to the automatic feed handle of the present invention, it is possible not only to obtain a large torque according to the diameter of the rotor attached to the inner periphery of the handle body, but also to exert a large holding force expressed as static thrust. Furthermore, by forming a large number of teeth on the inner periphery of the rotor according to the diameter of the rotor, it is possible to increase the accuracy of fine movement feed according to the number of teeth on the inner periphery of the rotor. The speed can be changed from fine feed to rapid feed depending on the frequency of the pulse current applied to the excitation section built into the feeder.

To explain this using the precision of fine feed as an example,
The number of steps required for the rotor to rotate once is A.
The pitch of each tooth of the rotor is B, the amount of movement per step is C, the pitch of the ball screw screwed into the feed shaft is D, the inner diameter of the rotor is E, the number of teeth on the inner circumference of the rotor is F, If the feed amount sent each time the feed shaft rotates once is G, then F = 1/4A, B = 4C,
There is a relationship of E=(A×C)/π and G=D/A.

Therefore, for example, if the number of steps A is 2000, the step amount is 0.25 mm, and the ball screw pitch is 4 mm, then from the above relational expression, there are 500 teeth with a pitch B of 1 mm on the inner periphery of a rotor whose inner diameter E is 159.15 mmφ. By forming , it is possible to perform fine movement in steps of 2 μm.Also, by doubling the number of teeth F on the rotor and setting the step amount C to 1/2, 0.125 mm, the number of steps A is doubled, allowing fine movement to be performed in steps of 1 μm. fine movement feed is now possible, and
Double the rotor inner diameter E, double the number of steps A,
When the step amount C is set to 0.125 mm, fine movement feed in increments of 0.5 μm becomes possible.

Therefore, the number of steps A required for one revolution of the rotor, the pitch B of each tooth of the rotor,
Step amount C, which is the amount of movement per step,
By appropriately setting the pitch D of the ball screw screwed into the feed shaft, the inner diameter E of the rotor, and the number of teeth F on the inner circumference of the rotor, a desired fine feed can be achieved.

Furthermore, the rapid feed and holding force can be set to desired values by changing the frequency of the pulse current applied to the excitation part of the linear motor mechanism, changing the inner diameter of the rotor, or the like.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The automatic feed handle of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

1-3, an automatic feed handle A according to an embodiment of the invention is shown.

Reference numeral 1 in the figure is a feed shaft that constitutes a feed device, and it is rotatably supported by a device body 2 of the feed device via a bearing 3, and a feed screw (not shown) is carved on one side of the feed shaft. and is screwed into a ball screw of a moving table (not shown). Also,
An automatic feed handle A of this embodiment is attached to one end of the feed shaft 1 protruding from the main body 2 of the apparatus.

This automatic feed handle A is composed of a handle body 6 attached to the feed shaft 1 side with a key 4 and a nut 5, and a stator 10 attached to the device body 2 side, and the handle body 6 has a periphery on the back side. A rear outer ring 7 is attached to the outer ring 7, and a magnetic steel annular rotor 8 having a large number of teeth 9 on the inner circumference is attached to the inner circumference of the outer ring 7. Inside the inner circumference of
A pair of left and right stators 10 having excitation parts are arranged with a gap d maintained therebetween.

In this embodiment, as shown in FIGS. 2 and 3, the stator 10 is attached to an iron plate yoke 13, which is attached to the apparatus main body 2 by attachment bolts 12, using setscrews 14. . Moreover, the excitation part of this stator 10 is
A pair of electromagnets 1 equipped with a plurality of inductor teeth 17b facing the teeth 7 of the rotor 8 at the tip of the excitation core 17.
6 and a permanent magnet 15 with a substantially doglegged cross section installed between the pair of electromagnets 16,
Further, a coil 18 is wound around each pole portion 17a of the excitation core 17.

In addition, on the front surface of the handle body 6, as shown in FIGS. 1 and 2, there is a scale 2 along the circumference.
A scale plate 20 on which 1 is engraved is provided,
Further, a mark 22 is provided on the apparatus main body 2 via a bracket 23, and by reading the scale 21 of the scale plate 20 through this mark 22, the amount of feed of the moving table can be read. There is. Note that reference numeral 6a is a grip portion provided on the handle body 6, and when manually rotating the handle body 6 when power is not supplied, this grip portion 6 is used.
It is something that you hold and rotate.

In the automatic feed handle A of this embodiment, when power is supplied to the excitation part on the stator 10 side, the magnetic flux of the permanent magnet 15 and the magnetic flux of the electromagnet 16 are adjusted in this excitation part, and the inductor teeth 1 on the stator 10 side are
The stable position between 7b and the teeth 9 on the rotor 8 side changes sequentially, and as a result, the rotor 8 rotates by a predetermined step amount, and the handle body 6 rotates via the outer ring 7 and feeds. Rotation is transmitted to the shaft 1, and fine movement and rapid movement of the moving table are performed. Also, during this power supply, each electromagnet 16
By maintaining the balance of the magnetic force in each pole part 17a of the excitation core 17, the rotor 8 stands still, and the rotation of the rotor 8 is suppressed by a holding force corresponding to the strength of the magnetomotive force of the excitation part of the stator 10. .

Furthermore, when performing manual feeding in cases where highly accurate fine-movement feeding is not required, the power supply to the stator 10 is stopped and the handle body 6 is rotated using a lever holding the grip portion 6a of the handle body 6.
You can make the desired feed.

〔Effect of the invention〕

According to the present invention, by controlling the frequency of the pulse current to the excitation part of the stator,
The rotational speed of the rotor, that is, the rotational speed of the feed shaft, can be controlled, allowing the device to be fed to be moved arbitrarily from fine to rapid feeding. Since the outer ring is attached to the outer ring and the rotor is attached to the inner periphery of this outer ring, the number of teeth on this rotor can be increased. The positioning accuracy is significantly improved, and the torque proportional to the rotor radius is large, so the holding force for the device to be fed is large in the stopped state, and manual feeding with the handle body is also possible in the non-excited state. Various excellent effects can be achieved.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing the main parts of the automatic feed handle of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a partial sectional view showing the stator installation state, and Fig. 4 is a sectional view taken along the line - - in Fig. 1. FIG. 2 is an overall side view showing a conventional feeding device. Explanation of symbols A...Automatic feed handle, 1...
Feed shaft, 2...device body, 6...handle body,
7... Outer ring, 8... Rotor, 9... Teeth, d... Gap, 10... Stator, 13... Permanent magnet, 16
...Electromagnet, 17...Exciting core, 17b...Inductor tooth, 20...Scale plate, 22...Marker.

Claims (1)

[Scope of Claims] 1. An automatic feed handle used in a feed device that converts rotational motion into linear motion and feeds the feed device, and is attached to one end of the feed shaft of the feed device, and is used to manually control the feed device when power is not supplied. A handle body for feeding,
A rotor is attached to the peripheral edge of the back side of the handle body via an outer ring and has a large number of teeth, and a rotor is attached to the device body side of the feeding device and is located inside the inner circumference of the rotor and is located at a predetermined distance from the rotor. The stator has a plurality of excitation parts located at intervals, and a stator that rotates or holds the rotor by the magnetomotive force of the excitation part during power supply to finely feed and hold the device to be fed. automatic feed handle. 2. The automatic motor according to claim 1, wherein the excitation part of the stator is composed of a permanent magnet and a plurality of sets of electromagnets each having a plurality of inductor teeth facing the teeth of the rotor at the tip of the excitation core. feed handle. 3. A scale plate for reading the feed amount is provided on the front surface of the handle body side, and a mark for reading the feed amount is provided on the stator side, as described in claim 1 or 2. automatic feed handle.