JPH01201557A - Needle selector of circular knitting machine - Google Patents

Abstract

PURPOSE: To enable a needle selector to be applicable to very high driving rotational number of a circular knitting machine having a small diameter by providing a solenoid formed by superposing a core on a needle-selecting magnet pole of a magnet pole piece in a cavity provided in a permanent magnet. CONSTITUTION: This needle selector fixes at least one permanent magnet 5 to a magnet pole piece 1 so as a solenoid 4 having a core 2 to be provided in a cavity 5.1 of the permanent magnet 5. A driving part of the electromagnetic transducer is composed of a holding piece 1.4 opposed to a jack and a needle selecting magnet pole 1.1 on which a core 2 of the solenoid 4 is carried.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a circular [1ffl] needle selection device.

[Conventional technology]

Typically, small diameter circular knitting machines include a patterning device consisting of a patterning drum and a series of levers that sense the surface of the drum and control the movement of the patterning jack. but,
Since such pattern setting device designs allow only relatively small patterns to be knitted, modern small diameter circular knitting machines are increasingly equipped with electronic pattern forming devices.

[Problem to be solved by the invention]

It is equipped with a series of levers, and the actuation of these levers is
Patterning devices are also known in which the inoperative position is provided by an electronically controlled latch.

Although this pattern forming device is superior to the mechanically controlled pattern forming device described above in terms of versatility, it is completely unsuitable for high-speed operation due to its complicated structure and high device height.

Another known handle device consists of a pole piece, a permanent magnet, and an electromagnet and is configured to act directly on the handle jack. Although this design device has a simple structure, it has the disadvantage that its range of action is limited due to the low efficiency of the electromagnet at operating speeds above 2000 Hz.

An object of the present invention is to provide a simple electronically controlled needle selection device that can be applied to very high operating speeds in a small-diameter circular knitting machine for knitting women's sock rings. be.

[Means to solve the problem]

A feature of the present invention is that a cavity is provided in the permanent magnet, and a solenoid is provided in the cavity, in which the cores of the magnetic pole pieces are overlapped.

The main advantage of this needle selection device is that it provides the high and uniform saturation of the pole pieces necessary for effective retention of the jack of the knitting machine, as well as the high and uniform saturation of the pole pieces, especially at high speeds of the needle cylinder. 3 important things to improve credibility
A high efficiency of the solenoid at operating speeds above 000 Hz is achieved.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

The needle selection device of knitting machines, especially small-diameter circular knitting machines, consists of one magnetic pole piece l. This magnetic pole piece 1 is often a plate made of a ferromagnetic material such as soft iron or ferrite. A selection pole 1.1 is provided in the pole piece 1, which is separated from the pole piece 1 by a groove 1.3 and a non-magnetic insert 1.2. This non-magnetic insert 1.2 is made of brass, ceramic or other metallic or non-metallic material. In the groove 1.3, there is a core 2.3 made of a strong fn material. Coil 3. An electromagnet is provided formed by a solenoid 4 wound on the coil. At least one permanent magnet 5 is fixed to the pole piece l such that a solenoid 4 with a core 2 is arranged in a permanent magnet cavity 5.1. Two permanent magnets 5 may be provided for this pole piece l. In this embodiment, two permanent magnets 5 are fixed to the magnetic pole piece 1 with the same magnetic poles facing each other in mirror symmetry. That is, both permanent magnets 5 have either their positive or negative poles directed toward the magnetic pole piece 1 . The active parts of this electromagnetic transducer are a holding side 1.4 facing a working element or jack (not shown) and a selection pole 1.1 on which the core 2 of the solenoid 4 is carried.

The device of the invention described above operates as follows.

The magnetic pole piece 1 is magnetized by the action of the permanent magnet 5 to the same polarity as this permanent magnet is attracted and held to the magnetic pole piece l. As a result, the pole piece l holds a working element (not shown), that is, a handle jack, which passes along the pole piece in the vicinity of the holding edge 1.4.

This permanent magnet 5 is connected to a solenoid 4 installed in the groove 1.3.
Since it also surrounds the holding side 1.4, relatively uniform magnetic saturation can be obtained over the entire length of the holding side 1.4. This is important in order to securely hold the handle jack. When a voltage giving the appropriate polarity is supplied to the solenoid 4, the magnetic flux in the vicinity of the needle selection pole 1.1 disappears. This needle selection magnetic pole 1.
1 is separated from the pole piece l by a non-magnetic insert 1.2, so the loss of magnetic flux caused by the permanent magnet does not occur anywhere other than the magnetic pole 1.1, and therefore the magnetic force on the holding sides 1 and 4 also disappears. do not. Therefore, only the holding of the handle jack in the position of the needle selection pole 1.1 is released and movement is imparted to it. Since the solenoid 4 with the core 2 is placed in the cavity 5.1 of the permanent magnet 5, the leakage flux of the solenoid 4 is effectively suppressed by the effect of the permanent magnet. As described above, the device of the present invention has higher efficiency than the conventional device, and can be applied even when the rotational speed of the needle cylinder is high.

The present invention is not limited to small-diameter circular knitting machines, but can also be applied to large-diameter circular knitting machines, flat knitting machines that run in one direction or both directions, and the like.

[Brief explanation of the drawing]

The drawing is a perspective view of the needle selection device of the present invention. 1 - one pole piece, 2 - core, 3 - coil, 4 - solenoid, 5 - permanent magnet. The following is an engraving of the blank drawings (no changes to the content): t: W7Cy + 4 Procedural amendment (method) % formula % 1. Indication of the case 1988 Patent Application No. 253954 2. Name of the invention Needle selection for circular knitting machine Device 3. Relationship with the person making the amendment Patent applicant name: Erytex, Concerntextilniho Strogilenstobi 4, Agent address: 8-10-7, Toranomon-chome, Minato-ku, Tokyo 105
Contents of the amendment: engraving of the drawings (no changes in content) 8. 1 copy of the engraving of the catalog of attached documents

Claims (1)

[Claims] 1. A needle selection device for a knitting machine comprising at least one permanent magnet, one pole piece with a needle selection magnetic pole, and a solenoid carried thereon, the permanent magnet (5) having a cavity (
5.1), in which a solenoid (4) with a core (2) superimposed on the selection pole (1.1) of the pole piece (1) is installed. Needle selection device.