JPH02154041A - Needle-selecting method for knitting- machine and electromagnetic transducer for selection thereof - Google Patents

Abstract

PURPOSE: To raise reliability in a needle selecting action of an operation element by moving each operation element by a plurality of serial needle selecting pulses having time and interval synchronized with the movement of the operation element of a knitting machine. CONSTITUTION: In the movement of an operation element of a knitting machine along a needle selecting path 5 in parallel with a transducer, a first needle selecting pulse 1 takes action until the pulse reaches from a point of time 11 to a point of time 12. When the operation element reaches the point of time 21, a second needle selecting pulse 2 is started and releases a patterning jack from its nonoperation position. When the operation element reaches a point of time 31 or a point of time 41 of a path 5 set in the operation region of a preceding pulse, a third and a fourth needle selecting pulses 3 and 4 are started and the operation element stops at a point of time 32 or a point of time 42. At these points of time, the end point of a region continued to the path 5 is set outside a region on the needle selecting path of the preceding needled selecting pulses and these needle selecting pulses are synchronized with the movement of the operation element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a needle selection method in a knitting machine and an electromagnetic transducer for implementing this method.

[Conventional technology]

Many needle selection methods have been proposed for circular knitting machines and the like.

Many of these methods allocate one needle selection pulse to - work elements such as needle jacks. This needle selection pulse is applied to each transducer at the moment when a working element of the knitting machine is present at or passes a predetermined location of the transducer.

It is also known to transmit the needle selection pulses to the working elements of the knitting machine by means of their movement, such as by means of low-reflection transducers.

Another method is to allocate one needle selection pulse to some suitably grouped working elements of a knitting machine.

A common drawback of these known needle selection methods in electronically controlled knitting machines is the limited speed of the knitting machine, especially in fine gauge circular knitting where the duration of the pulse on one working element is very short. This is a problem when using a machine. Due to the final weight of the working element, the mechanical movements are small and insufficient for needle selection.

The main disadvantage of the method utilizing low retransducers is that the transducer must be rotated at very high speeds, which consumes a lot of energy and does not improve the overall productivity of the device.

The implementation of the above-mentioned method of using a large number of electromagnetic transducers for each working element or groups of knitting machines is very expensive from a productivity point of view, mechanically and electrically complex and increases the work efficiency. It has the disadvantage of low reliability and high adjustment costs.

Many electromagnetic transducers have been designed for needle selection. Many of these known devices utilize the attractive force of a permanent magnet with a pole piece and are designed to eliminate the effect of the permanent magnet at the location of the pole piece using at least one electromagnet.

One of them has a permanent magnet with two pole pieces. A portion of one pole piece simultaneously forms the core of the electromagnet, making it possible to eliminate the effect of a permanent magnet.

In other similar devices, electromagnetic coils are mounted on both pole pieces of a permanent magnet.

Another known device is characterized in that it comprises two permanent magnets with three pole pieces.

Many other devices are known that modify the above-mentioned configuration or provide a common permanent magnet for two adjacent needle selection points.

Devices are also known in which a permanent magnet is placed on one magnetic pole piece with an electromagnetic coil.

A common drawback of these devices is the complexity of the pole piece design, especially the design of the three-pole structure. Another disadvantage is that the magnetic flux of the electromagnet must be strong in order to eliminate the attractive force of the permanent magnet, which creates a considerable heat load on the electromagnet. A fundamental drawback of all the above-mentioned known arrangements is that the needle selection of the working elements of the knitting machine takes place at one predetermined location of the electromagnetic transducer, ie at a location which eliminates the effect of the permanent magnet.

The width of the pole pieces that eliminates the effect of the permanent magnet is determined geometrically by the distance between the working elements of the knitting machine on which the electromagnetic transducer acts.

This configuration of electromagnetic transducers limits the operating speed of the knitting machine.

[Problem to be solved by the invention]

The object of the present invention is to provide a novel needle selection method for working elements which eliminates the above-mentioned drawbacks and does not limit the speed of the knitting machine;
The object of the present invention is to provide a new configuration of an electromagnetic transducer used for this purpose.

The object of the present invention is achieved by a needle selection method for a knitting machine and an electromagnetic transducer, the gist of which is to act on each working element at least two successive needle selection pulses synchronized in time and interval with the movement of the working element. be done.

The advantage of this method is that needle selection pulses are generated sequentially at predetermined intervals in synchronization with the working elements of the knitting machine, which together with the action area of the electromagnetic transducer increases the reliability of the needle selection action of the working elements. The key point is that the route required for this purpose can be extended.

Another advantage is that the area of action for the working elements is not limited by the geometrical distance between the working elements on the knitting machine. By suitably designing the length of the needle selection pulse, the point of action of the electromagnetic and/or electromechanical transducer on the working element can be moved continuously or sequentially depending on its movement.

The subject matter of the electromagnetic transducer according to the invention consists in arranging at least two electromagnets in the recess of the pole piece, both electromagnets being connected to the suction edge of the transducer by means of a connecting pole piece.

The main advantage of this transducer is that the action of the electromagnet within a width limited by the number and width of each pole piece connected to each other, i.e., on each pole piece of the electromagnet independently of the other electromagnets of the transducer. This is due to the disappearance of the magnetic pole of the magnetic pole piece.

A further advantage is that the full width of action of the pole pieces of the electromagnet is not limited to the geometrical distance of the working element of the knitting machine to be selected. A non-negligible advantage lies in the possibility of selecting the sequential movement of the individual electromagnets to prolong the action of the transducer and to provide a high resolution of the movement of the working elements of the knitting machine. Various widths of the magnetic pole pieces of each electromagnet of the transducer, particularly the widths of the electromagnets on both sides, may be varied. This means that it is highly adaptable to a range of rotational speeds from standstill to normal rotational speed, and is highly adaptable to various types of knitting machines, especially fine gauge circular knitting machines. means.

Other advantages and features of the needle selection method according to the invention and of the electromagnetic transducer for implementing this method will become clearer from the preferred embodiments shown in the drawings described below.

〔Example〕

A needle selection method for a working element in a circular or flat knitting machine in which the working element is moved along an electronically controlled electromagnetic and/or electro-mechanical transducer is a method for needle selection of a working element in a circular knitting machine or a flat knitting machine, in which the working element is moved along an electronically controlled electromagnetic and/or electro-mechanical transducer. This is carried out on a knitting machine equipped with a working element consisting of a knitting needle with a heavy bat and a swingable jack provided below the bat.

A raising and lowering cam is fixed to a stationary portion on the outer periphery of the needle cylinder within the spacing between the butts. - An intermediate jack, which is swingably and movably mounted on the book, is assigned to a swingably mounted jack.

This intermediate jack is provided in the body of the intermediate jack within the needle cylinder. A flexible patterning jack is assigned to each intermediate jack, which patterning jack is mounted on the body of the intermediate jack parallel to the knitting needles. A lifting cam is provided below the patterning jack, and an electromagnetically and/or electromechanically controlled transducer connected to the control mechanism of the knitting machine is further assigned to the patterning jack. There is.

The needle selection control of a working element, such as a knitting needle, is carried out by an electromagnetic and/or electromechanical transducer, which is always activated by at least two needle selection pulses synchronized in time and interval with the movement of the working element. Release the handle jack from its inoperative position. This jack engages with a rising cam and pushes up one end of the intermediate jack, which is installed so that it can swing and move, thereby causing the other end of the intermediate jack to press against the lower butt of the jack that is installed so that it can swing. . Next, this swingably installed jack uses its upper butt to swing the lower butt of the braided needles to the vicinity of the raising cam of the knitting machine. This cam raises the knitting needles to the desired position.

In FIG. 1, during the movement of the working element of the knitting machine along a predetermined needle selection path 5 along the transducer, the transducer emits a first needle selection pulse 1, which causes the time point 11 of the path 5 to change to the time point 12. The above-mentioned effects are applied until the As soon as the working element reaches a preselected time 21 on the path 5 within the area defined at time 11.12, the transducer emits a second selection pulse 2 to move the handle jack from its inactive position. release. This pulse continues until time 22, which is set outside the area defined at time 11.12. Upon reaching the instant 31 or 41 of the path 5 set within the working area of the preceding pulse, the transducer emits the third and fourth selection pulse 3.4 as before, thereby causing the working element to stops at time 32 or 42. These points are
The end point of the successive area of the needle selection path 5 is set outside the area on the needle selection path of the preceding needle selection pulse. As a result, the effects of the needle selection pulses on the needle selection path 5 on the working elements of the knitting machine overlap. These selection pulses are synchronized with the movement of the working element in terms of interval and time, so that
The action time is increased, and even if the needle cylinder rotates at a very high speed, the needle selection action can be performed reliably.

In another needle selection method of the present invention, as shown in FIG. 2, the transducer emits a first needle selection pulse 6 at time 61 on path 5, which continues until time 62. At this point in time 62, the action of the needle selection pulse 6 ends and the second needle selection pulse 7 begins at time 71. This point in time coincides with the point in time 62 of the preceding section of path 5. Similarly, after the action of the second needle selection pulse 7 has ended at time 72, a third needle selection pulse 8 is applied at time 7 in the preceding area.
2 and ends at time 82. Then, in the same way, as soon as the preceding needle selection pulse 8 has ended, a fourth needle selection pulse takes place in a defined area at time 91.92.

By selecting an appropriate number of sequential needle selection pulses,
Both needle selection methods make it possible to carry out reliable needle selection even when the rotational speed of the needle cylinder is very high. This could not be achieved with the conventional method of applying only one needle selection pulse to the working element.

The electromagnetic transducer used for needle selection is placed on a pole piece 1 made of a magnetic plate.

The surface of this plate on which the suction edge 11 is located faces a jack which is installed in the track of the working element (not shown) of the knitting machine, namely the needle cylinder.

The pole piece 1 is provided with a recess 14, which is connected to another recess 12.
It is connected to the suction edge 11 and the groove 13 by. Recess 1
An electromagnet 2 is installed inside the magnet 4. Core 2 of electromagnet 2
3 has a magnetic pole piece 21 on the side facing the suction edge 11, and a component 22 magnetically connected to the magnetic pole piece 1 on the opposite side. These poles 21 of the electromagnet 2 are placed parallel to each other in the recess 12 and are separated from the pole piece 1 as well as from each other by a non-magnetic but electrically conductive insert 15. On the other hand, the facing side of the magnetic pole piece 21 and the non-magnetic insert 15 are continuously linked to the attraction edge 11 of the magnetic pole piece 1. A permanent magnet 3 is fixed to this pole piece.

The suction edge 11 of the pole piece 1 in both embodiments faces a working element (not shown) of a knitting machine, such as a spring jack, for example.

The coil 24 of the electromagnet 2 is connected to a source of electrical pulses which is controlled by a synchronizer. The electrical pulse source, the synchronizer, and the working elements of the knitting machine are not shown. This is because these are known and are not absolutely necessary for explaining the operation of electromagnetic transducers.

The electromagnetic transducer of the present invention operates as follows.

The magnetization of the pole piece 1 is obtained by a fixed permanent magnet 3 on the pole piece 1. This exerts a force on a working element made of ferromagnetic material, such as a handle jack.

If the pair 31, 32 of the permanent magnet 3 have the same polarity and face the pole piece 1, the polarity of the pole piece 21 of the electromagnet 2 is the same as that of the pole piece 1.
It is the same as that of Therefore, the attraction force of the magnetic pole piece 1 is constant over the entire length of the attraction edge 11. The working element that moves along the attraction 1ull of the magnetic pole piece 1 is the electromagnet 2
It moves along the magnetic pole piece 21 without being influenced by the magnetic pole piece 21. When an appropriate pulse is applied to the coil 24 of any electromagnet 2, the magnetization of the pole piece 21 of each electromagnet 2 is demagnetized. This means that the effect of the force of the selected pole piece 21 acting on the working element of the knitting machine moving along the selected pole piece 21 disappears during the pulse. When an appropriate electric pulse is simultaneously applied to all electromagnets 2 installed on the magnetic pole piece 1,
There is a loss of magnetism in all the pole pieces 21 of the electromagnet 2 and, thereby, a loss of force at all the pole pieces 21 located on the suction edge 11 of the pole piece 1 . Any combination of the time sequences of the electrical pulses for the coils 24 of the electromagnet 2 can be used for the desired control of the working elements of the knitting machine.

[Brief explanation of the drawing]

Figure 1 shows a series of partially overlapping needle selection pulses, Figure 2 shows a series of successive needle selection pulses, and Figure 3 shows the plane of an electromagnetic transducer with the same width as the electromagnet and pole piece. FIG. 4 shows a side view of the electromagnetic transducer as seen from the suction lip, FIG. 5 shows a top view of the electromagnetic transducer with pole pieces of different widths, and FIG. A side view seen from the suction edge is shown. DESCRIPTION OF SYMBOLS 1... Magnetic pole piece, 2... Electromagnet, 3... Permanent magnet, 11... Adsorption edge, 12... Recessed part, 13... Groove, 14... Recessed part, 15... Insert , 21... Magnetic pole piece, 24... Coil, 31.32... Permanent magnet. Wasa 4 Ajito 5th figure 2h

Claims (1)

[Claims] 1. A needle selection method in which a working element of a circular knitting machine is moved to a desired position by an electronically controlled electromagnetic transducer and/or an electromechanical transducer, the method comprising: A method characterized in that each working element is moved by at least two sequential selection pulses having a time and interval synchronized with the movement of the working element. 2. The method of claim 1, wherein the sequential needle selection pulses at least partially overlap. 3. Method according to claim 1, characterized in that sequential pulses are linked to each other. 4. An electromagnetic transducer for carrying out the method of claim 1, comprising a permanent magnet and a magnetic pole piece assigned thereto, wherein at least two electromagnets (2) are installed in the recesses of the magnetic pole piece (14). , the electromagnet is connected by the connecting pole piece (21) to the attractive edge (1) of the magnetic transducer pole piece (1).
11). 5. Transducer according to claim 4, characterized in that the widths of the connecting pole pieces (21) of the electromagnet (2) are all the same. 6. The transducer according to claim 4, characterized in that the widths of the connecting pole pieces (21) of the electromagnets are different from each other.