JPS6332584B2 - - 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.

[Prior Art] Conventionally, as a feeding device to which this type 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-mentioned table e is slid according to a guide not shown in the figure by the operation, 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 by the above-mentioned operation. There is one in which the feeding is performed in accordance with the lead of the ball screw f2, and the amount of feed 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 labor.

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 placed 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 equipment became larger than necessary.

[Means and actions for solving problems]

In view of this, the present invention was proposed to solve each of the above-mentioned problems, and includes a handle body attached to one end of a feed shaft constituting a feed device for converting rotational motion into linear motion. A rotor with a large number of teeth is attached to the outer periphery of the handle body, and a stator having a plurality of excitation parts is disposed outside the outer periphery of the rotor with a predetermined gap maintained from the rotor, thereby supplying power. At times, the rotor is rotated or held by the magnetomotive force of the excitation part of the stator to perform fine movement feeding and holding of the device to be fed, and when power is not supplied, automatic feeding can be selectively performed with manual feeding using the handle body. It's a handle.

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 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.

In the automatic feed handle of the present invention, a rotor is attached to the outer periphery of the handle body having a large diameter, and a stator is arranged on the outer periphery of the rotor to constitute a linear motor mechanism for rotating the handle body. A scale plate for reading the feed amount is provided on the front surface of the main body, and a mark for reading the feed amount is provided on the stator side, so that accurate fine movement feed can be performed while visually checking.

The automatic feed handle of the present invention is constructed by incorporating a linear motor mechanism consisting of a rotor with a large number of teeth and a stator with a plurality of excitation parts into the large diameter handle body attached to the feed shaft in this way. 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, thereby rotating the rotor and rotating the handle body. The feed shaft is rotated through the rotor to feed the device to be sent, such as an .

According to the automatic feed handle of the present invention, not only can a large torque be obtained in accordance with the diameter of the rotor attached to the outer periphery of the handle body, but also a large holding force expressed as static thrust can be exerted. In addition, by forming a large number of teeth on the outer 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 outer 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.

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 various pitches of the rotor are B, the amount of movement per step is C, the pitch of the ball screw screwed into the feed shaft is D, the outer diameter of the rotor is E, the number of teeth on the outer circumference of the rotor is F, and the feed If the amount of feed sent each time the shaft rotates is G, then F=1/4A, B=
There is a relationship of 4C, 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, a rotor with an outer diameter E of 159.15 mmφ has 500 teeth with a pitch B of 1 mm on the outer periphery. 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 outer diameter E, double the number of steps A,
If 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, the step amount C which is the amount of movement per step, and the pitch D of the ball screw screwed into the feed shaft. By appropriately setting the outer diameter E of the rotor and the number F of teeth on the outer periphery of the rotor, a desired fine movement 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 outer 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.

1-4, an automatic feed handle 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 that is attached to the feed shaft 1 side with a key 4 and bolts 5, and a stator 10 that is attached to the device body 2 side. A magnetic steel annular rotor 8 having a large number of teeth 7 is attached to the outer circumferential surface of the rotor 8, and an excitation section 1 is connected to the outer circumference of the rotor 8 with a gap 9 maintained therebetween.
A pair of left and right stators 10 having a number of stators 10 are disposed.

In this embodiment, the stator 10 is attached to an iron plate yoke 13, which is attached to the apparatus main body 2 by means of attachment bolts 12, using setscrews 14, respectively. Also, this stator 10
The excitation section 11 has a rotor 8 at the tip of the excitation core 17.
It is composed of a pair of electromagnets 16 having a plurality of inductor teeth 17b facing the teeth 7 of A coil 18 is wound around each pole portion 17a of the excitation core 17.

Further, on the front surface of the handle body 6, although omitted in FIGS. 1 and 2, as shown in FIGS. 3 and 4, a scale 21 is carved along the circumference. A plate 20 is provided, and as shown in FIGS. 1 and 2, the stator 1
A mark 22 is provided on the 0 side, and by reading the scale 21 of the scale plate 20 through this mark 22, the amount of feed of the movable table can be read.

In addition, in this embodiment, the stator 1
A donut-shaped cover 23 made of a transparent material such as acrylic resin is attached to the stator 10, and covers the stator 10 from the front surface to the outer circumferential surface of the stator 10.
0, and the mark 22 is this cover 23.
The grip portion 6a provided on the handle body 6 can be rotated along the inner periphery of the cover 23.

In the automatic feed handle A of this embodiment, when power is supplied to the excitation part 11 on the stator 10 side, in this excitation part 11, the magnetic flux of the permanent magnet 15 and the electromagnet 1
6 is adjusted and the stable position between the inductor teeth 17b on the stator 10 side and the teeth 7 on the rotor 8 side changes sequentially, thereby causing the rotor 8 to rotate by a predetermined step amount, Accompanying this, the handle body 6 rotates and the rotation is transmitted to the feed shaft 1, thereby performing fine movement feed and rapid feed of the movable table. In addition, during this power supply, by maintaining the balance of the magnetic force in each pole part 17a of the excitation core 17 of each electromagnet 16, the rotor 8 is kept stationary and the magnetomotive force is adjusted according to the strength of the magnetomotive force possessed by the excitation part 11 of the stator 10. Rotation of the rotor 8 is suppressed by the holding force.

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. This allows the number of teeth on this rotor to be increased, which not only increases the accuracy of fine movement feed, but also significantly improves the positioning accuracy of the device to be fed, and increases the number of teeth on the rotor. Since the proportional torque is large, the holding force against the device to be fed is large in the stopped state, and furthermore, manual feeding by the handle body is possible in the non-excited state, and various excellent effects can be achieved. .

[Brief explanation of the drawing]

FIG. 1 is a 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. Figure 4 is a sectional view taken along the - line in Figure 3;
The figure 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...Teeth, 8...Rotor, 9...Gap, 10...
Stator, 11... Excitation part, 13... Permanent magnet,
16... Electromagnet, 17... Excitation 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 outer periphery of the handle body and has a large number of teeth; An automatic feed handle comprising: a stator, which has an excitation part, and rotates or holds the rotor by the magnetomotive force of the excitation part when power is supplied, thereby finely feeding and holding the device to be fed. 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 side of the handle body, and a mark for reading the feed amount is provided on the stator side, as described in claim 1 or 2. automatic feed handle.