JPS63227844A - High speed electromagnetic actuator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-speed electromagnetic actuator for a selection device in a knitting machine, such as for hosiery knitting.

[Conventional technology]

As is well known, electromagnetic actuators are particularly suitable for controlling selection devices of knitting machines, such as those for hosiery knitting, due to their small size and high operating speed.

Some types of i-magnetic actuators basically consist of a lever that is rotatably supported by the frame with a portion of the lever rotatably connected to the frame, and an electromagnet is applied to the lever to move the lever together. While swinging in the direction, the swinging in the return direction is performed by a permanent magnet.

Two i! Electromagnetic actuators are already known in which electromagnetic levers are actuated in opposite directions to swing in both directions.

In order to operate at a sufficiently high speed without overloading the electromagnet windings, the lever is usually provided with a projection extending in the direction of the core of each electromagnet.

A member of a non-magnetic material, usually phosphor bronze, is interposed between the protrusion and the core of the electromagnet, and this member has the effect of absorbing the impact of the protrusion and preventing the protrusion from adhering to the electromagnet. It is designed to perform the following functions.

Particularly in the selection devices of knitting machines, such as those for hosiery knitting, as the required operating speed increases and the number of oscillation cycles increases, excessive wear occurs on the member interposed between the electromagnet core and the protrusion. It turned out that

[Problem to be solved by the invention]

The main object of the present invention is to provide an electromagnetic actuator that solves the above problems, and specifically provides an actuator that has a higher operating speed compared to known devices, has a longer device life, and is reliable in use. The objective is to provide a highly functional structure.

To this end, the invention aims to provide an actuator that can achieve very high actuation speeds without causing thermal phenomena.

A further object of the present invention is to provide an actuator that is easy to manufacture, compact, and can be installed in a sock knitting machine even if it has a small diameter and a large number of yarn feeders.

[Means to solve the problem]

To achieve the above object and other objects, the present invention provides a high-speed electromagnetic actuator suitable for a selection device of a knitting machine for hosiery knitting, etc., in which a lever is connected by a frame, a portion of which is rotatably connected to the frame. at least one electromagnet is provided which is swingably supported in a state in which the lever is oscillated and acts on the lever to cause it to swing, and the lever is provided with at least one protrusion made of a ferromagnetic material that is attached to the core of the electromagnet. The actuator is provided so as to extend in the above direction, and is characterized in that a wear-resistant non-magnetic synthetic material is molded on at least the portions of the core and the projections that face each other.

Further, as described in claims 2 and below, the intermediate portion of the lever is rotatably connected to the frame and extends in the direction of the cores of two electromagnets that act on the lever in opposite directions. Two protrusions are provided on the lever, or a frame made of a ferromagnetic material is provided with a second protrusion that swingably supports the lever between a pair of protrusions extending in the direction of the lever and forming the core of the electromagnet. 3 protrusions, or an additional third protrusion.
The thickness of the magnetic material in the protrusion portion and the intermediate portion of the lever is reduced to separate the lever frame assembly into two magnetic circuits, as well as in the core of the electromagnet and the protrusion of the lever. A wear-resistant synthetic material was attached to the bifurcation of the longitudinal end of the lever or to the middle part of the lever.

[Effect]

In the present invention, the lever is swung by an electromagnet, and since the core of the electromagnet and one or both of the opposing parts of the protrusion of the lever extending in the direction of the core are fitted with a wear-resistant non-magnetic synthetic material, the protrusion This buffers the impact between the core of the electromagnet and the core of the electromagnet, and prevents the protrusion from adhering to the electromagnet. The wear-resistant non-magnetic synthetic material also reduces wear.

Further, since the lever is provided with two protrusions extending in the direction of the cores of the two electromagnets that connect the intermediate portion of the lever to the frame in a freely rotatable manner and act on the lever in opposite directions, the two protrusions The electromagnet causes the lever to swing at the same swing speed on both sides of the lever's connection point to the frame, making it possible to achieve high actuation speeds.

In addition, a third protrusion that swingably supports the middle part of the lever is provided between the protrusions of the pair of frames, and the thickness of the magnetic material between the third protrusion and the middle part of the lever is reduced. The lever/frame assembly is separated into two magnetic circuits to prevent dispersion of the magnetic circuits and to ensure the action of the magnetic force by the electromagnet.

Furthermore, in the present invention, a wear-resistant non-magnetic synthetic material is attached to the branch part of the longitudinal end of the lever or the intermediate part of the lever, in addition to the part where the protrusion of the lever faces the core of the electromagnet. impact and wear are reduced.

[Example] In order to more clearly explain the features and effects of the present invention, an actuator according to an example of the present invention will be described below based on the drawings.

In the electromagnetic actuator of the embodiment of the present invention, indicated by reference numeral 1 in the drawings, a lever 3 is rotatably connected to a frame 2 and supported in a swingable manner, and acts on the lever to cause its swinging. An electromagnet is provided to generate the

In order to achieve very high actuation speeds, two electromagnets 4, 5 are provided which act on the lever 3 in opposite directions, so that the lever 3 swings with the same swing speed in both directions. It is effective to do so.

More specifically, the frame 2 is made of ferromagnetic material and has two projections 7.8 extending from its base 6 in a direction generally perpendicular to the base 6. The two protrusions 7.8 are the electromagnets 4.
It constitutes two cores of 9.5 and an electric winding 9.
10 is the default.

Between the two protrusions 7.8 is a third protrusion 11 parallel to it.
An intermediate portion of the lever 3 is rotatably connected to the end of the protrusion 11 on the side remote from the base 6.

With this construction, the lever 3 is generally parallel to the base 6 of the frame, and an advantageous construction is to provide the lever 3 with two projections 12, 13, which are placed on the same side of the lever.
In addition, they are made to extend in the direction of the electromagnet core 7.8 from opposite sides of the fulcrum.

According to this embodiment, at least one of the mutually opposing parts of the core of the electromagnet 4.5 and the lever is made of a wear-resistant non-magnetic synthetic material 20.

In the illustrated embodiment, the wear-resistant non-magnetic synthetic material is the protrusion 12.
It is formed on the tip of 13, but wear-resistant non-magnetic synthetic material is used for 1! It can also be molded into the core of the stone to effectively provide impact resistance and non-adhesion between the projections 12, 13 and the core of the electromagnet.

Experimental tests have shown that the most suitable materials meeting the requirements for formability and abrasion resistance are nylon reinforced with glass fiber reinforced nylon and carbon fiber, a composite of the trade name 'Mo1ikote'; can obtain excellent self-lubricating properties.

In an effective construction, the lever 3 is rotatably connected to the frame 2 at its intermediate portion 3a, and is formed of a molded article of wear-resistant and non-magnetic synthetic material, with the pivoting connection point between the lever and the frame being Reduce wear and tear.

Further, the longitudinal end 3b of the lever 3 is the same as the end 3b when the selection lever 14 is constructed of a selection lever 14 that swings between a position where it is connected to the device and a position where it does not interfere.

The above-mentioned materials are used to form the longitudinal end 3b and the intermediate portion 3 of the lever 3.
It can also be used for a, and the intermediate portion in particular is effective because of its excellent lubricity, and the end portion 3b has the advantage of being extremely lightweight and capable of achieving high-speed operation.

In order to fix the wear-resistant synthetic material to the lever 3, the other part, which is formed by a single piece of ferromagnetic material, is provided with a notch or hole, as indicated by 16, thereby forming a recess for shaping the material. do.

As mentioned above, the frame 2 and lever 3 are made of ferromagnetic material and constitute two magnetic circuits, each circuit being RAMed by an electromagnet.

In order to form a preferential circulation route for the magnetic flux, it is effective to reduce the thickness of the portion 17, ie, within the third protrusion 11 of the arm. More specifically, for the lever 3, the thickness reduction only needs to be carried out in the ferromagnetic material, so that one magnetic circuit is connected to the lever projection 12, part of the lever, and the third projection 11. , a part of the base of the frame, and the protrusion 7 of the frame, and another magnetic circuit,
The operation of the electromagnetic actuator according to this embodiment, which is constituted by the lever protrusion 13, a part of the lever, the third protrusion 11, a part of the frame base, and the frame protrusion 8, is clear, and the electric winding 9.10 is selectively connected to the electric winding 9.10. By applying electricity, the lever 3 swings.

〔Effect of the invention〕

The electromagnetic actuator according to the present invention is well suited for the above-mentioned purposes and incorporates a non-magnetic, wear-resistant synthetic material in certain areas of the lever, thereby reducing wear and improving lubricity. Furthermore, by reducing the overall weight of the lever, it is possible to significantly increase the swing speed and operational response.

Another advantage is that the lever can be optimally balanced with respect to the fulcrum, so that the electromagnetic force can be applied evenly.

A further advantage is that the very small size of the actuator makes it particularly suitable for use in selection devices of knitting machines, such as those for hosiery knitting.

The electromagnetic actuator described above can be subjected to various modifications and modifications within the scope of the present invention, and the detailed structure of each part can be replaced with technical equivalents.

In fact, materials other than those mentioned above can be used, and technically equivalent materials can also be used depending on the necessary conditions, usage, etc.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partial cutaway side views, respectively, of an electromagnetic actuator according to an embodiment of the invention as used in a selection device in two different operating positions; FIG. and FIG. 4 are perspective views showing the lever of the above embodiment according to the present invention before and after attachment of the non-magnetic wear-resistant material, FIG. 5 is a perspective view of the lever, and FIGS. 7 is a perspective view of a part of the lever rotatably connected to the frame, before and after the attachment of the wear-resistant synthetic material, and FIG. 8 is a perspective view of another part of the lever, respectively. 9 is a sectional view taken along line IX-IX in FIG. 4, and FIG. 10 is a sectional view taken along line XX in FIG. 7. 1-.-electromagnetic actuator, 2.--frame, 3-
Lever, 4, 5--electromagnet, 6--base,
7,8.11-Protrusions of the frame, 12.1
3.- Lever protrusion, 14... Selection lever, 15-
・Selector, 20-・Abrasion-resistant non-magnetic synthetic material. Agent: Patent attorney Akigai Sakama (3 people)

Claims (1)

[Scope of Claims] 1. A high-speed electromagnetic actuator suitable for a selection device of a knitting machine for hosiery knitting, etc., which allows a lever to swing freely by a frame with a portion of the lever rotatably connected to the frame. an actuator comprising at least one electromagnet for supporting and acting on the lever to cause its oscillation, the lever having at least one protrusion made of ferromagnetic material extending in the direction of the core of the electromagnet; A high-speed electromagnetic actuator according to claim 1, wherein a wear-resistant non-magnetic synthetic material is molded on at least the mutually opposing portions of the core and the protrusion. 2. In order to swing the lever, the intermediate portion of the lever is rotatably connected to the frame, and extends in the direction of the cores of two electromagnets that act on the lever in opposite directions. 2. The electromagnetic actuator according to claim 1, wherein said lever is provided with three protrusions. 3. The electromagnetic actuator according to claim 1 or 2, wherein the plurality of protrusions extend from the same side of the lever and from mutually opposite parts across the fulcrum of the lever. 4. A longitudinal end of the lever is branched, and the branched end is made of a wear-resistant synthetic material with a low specific weight and is connected to a drive device with an actuator. electromagnetic actuator. 5. An electromagnetic actuator according to any of claims 1 to 4, wherein said lever has an intermediate portion made of molded wear-resistant synthetic material. 6. Any part of the lever other than the molded part made of wear-resistant synthetic material is made of ferromagnetic material.
The electromagnetic actuator according to any of the above. 7. The electromagnetic actuator according to any one of claims 1 to 6, wherein a concave notch for fixing the molded synthetic material is provided in a portion of the lever to which the wear-resistant synthetic material is attached. 8. The frame is formed of a ferromagnetic material, the base thereof extends generally parallel to the longitudinal direction of the lever, and the frame is provided with a pair of protrusions extending in the direction of the lever and forming the core of the electromagnet. 8. The electromagnetic actuator according to claim 1, further comprising a third protrusion that swingably supports the lever between the pair of protrusions. 9. Reducing the thickness of the ferromagnetic material at the third protrusion portion of the frame base and at the intermediate portion of the lever, thereby separating the lever-frame assembly into two magnetic circuits; 9. An electromagnetic actuator according to claim 1, wherein each circuit is excited by one of said electromagnets. 10. The electromagnetic actuator according to any one of claims 1 to 9, wherein the molded synthetic material contains carbon fiber. 11. The electromagnetic actuator according to any one of claims 1 to 10, wherein the molded synthetic material contains glass fiber reinforced nylon. 12. An electromagnetic actuator according to any preceding claim, wherein the molded synthetic material comprises Molikote reinforced nylon.