JPH0586045B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a stopping and holding magnet having a double T-shaped weakly magnetic magnetic core, the magnetic core having a central portion thereof
It comprises a bobbin with a field winding, the legs of the T-shaped core ends being each directed towards a longitudinal side of the magnet as a pole of the magnet, forming a pair of poles on each longitudinal side of the magnet. and each of these polar pairs is
It relates to a type that is adapted to act on a flat knife-shaped movable part.

[0002]

BACKGROUND OF THE INVENTION Stopping and holding magnets of this type are used, for example, for controlling knitting machines of textile machines. The magnetic core in this case is generally a flat knife-shaped element which cooperates with the knitting device of the textile machine. Activation and preparation for knitting or weaving depending on whether this knife-shaped member (knife-shaped mover part) is attracted and held in place by the magnet, or is not attracted and held. Or no preparation is selected. Since textile machines must work as quickly as possible, the magnetic system is driven at a high cycle frequency. Also,
In textile machines, generally a large number of knitting devices are each controlled by a separate magnetic system, so that the magnetic system must be constructed very compactly.

[0003] Federal Republic of Germany Patent Application No.
No. 4028194.9 discloses an electromagnet having a substantially double T-shaped magnetic core and an excitation coil provided on the central axis of the magnetic core. In this magnet system, a pole pair is formed on each of the two longitudinal sides, which pole pair acts on, for example, a knife-shaped armature part.

[0004] If such a magnet is used as a holding magnet (in this case, the mover part is moved directly along the pole face, and when the magnet is activated, it is held here, that is, the mover part is (prevented from further longitudinal movement or falling) is largely satisfied.

[0005] However, such a magnet cannot be stopped and held in a manner in which a knife-shaped movable part is first attracted to each pole pair at a predetermined distance from each pole pair, and then held by these pole pairs. When used as a magnet, the problem is that the attractive force acting on the mover part from the magnet/pole pair is not sufficiently great to guarantee the necessary operational reliability in all cases.

[0006]

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to improve the magnet system of the type mentioned at the beginning so that magnets can be arranged at intervals without increasing the structural volume of the magnet system. It is possible to increase the pulling force acting on the knife-shaped movable part. In this case, the magnet system must consist of a small number of individual parts and must be suitable for inexpensive and economical mass production.

[0007]

[Means for solving the problem] According to the configuration of the present invention that solves this problem, the pole or the polar surface is
It has an extension or molded portion extending in the direction of the longitudinal axis of the magnetic core, and a generally U-shaped notch is formed on the end face side of the magnetic core.

[0008] Further advantageous features of the invention are specified in claims 2 to 10.

[0009]

[Effects of the Invention] According to the present invention, by extending the pole pieces, the operating pole surface becomes larger without increasing the volume of the entire magnet, and as a result, the force acting on each mover portion is reduced. The advantage was that it was significantly higher. In this case, the extension extends in the area of the bobbin flange that is provided in any case. In this case, the electrical coil connection element is also advantageously accommodated in a recess formed by the extension on the end side of the magnet core, so that no additional space is required for this purpose. There isn't.

[0010]

[Embodiment] The magnet core 1 shown in FIG.
is provided, and pole pieces 3, 3', 4, 4' extending upward or downward are integrally molded at both ends of the central portion 2. These upwardly or downwardly directed pole pieces 3, 4 or 3', 4' each form a pole pair (A or B). The ends of the pole pieces are provided with flat shaped sections 5 each extending in the direction of the longitudinal axis X of the central section. These moldings enlarge the pole face 6 of the pole piece, and they also form an approximately U-shaped cutout 7 in the end face of the end of the magnet core.

[0011] As shown in FIG. 2, the magnet core is provided with a winding frame 8, and a field winding 9 is wound around the winding frame 8. In this case, the bobbin 8 is assembled from two half-shells surrounding the magnetic core, or the bobbin 8 is formed as an injection molded part that encloses the magnetic core (the ends of the pole pieces being left open).

[0012] A contact piece 10 is provided at the left end of the winding frame.
The end of the contact piece 10 on the winding side is connected to the winding connection part of the field winding. The contact piece extends through a U-shaped cutout 7 in the magnetic core.

[0013] A contact piece 11 is provided in the right end region of the magnetic core, and the contact piece 11 is
It is located in a U-shaped notch 7 in the magnetic core, where it is electrically conductively connected to the magnetic core material.

[0014] As shown in FIG. 3, this magnet system is inserted into the holder 12. Further, as shown in FIG. 3, a number of knife-shaped mover parts 13, 13' are shown, and current is supplied to the field winding 9 to these mover parts 13, 13'. and pole pieces A and B act. These armature parts are provided with cutouts 14, which cooperate with retaining projections provided on the holder. This retaining projection is optionally molded directly onto one of the poles or onto one of the pole pieces.

[0015] When this magnet system is activated, the knitting device of the textile machine or the movable part connected to the weaving device is mechanically moved at a predetermined distance in front of the pole pair A, B. , when current is applied to the field winding, this mover section is attracted by the pole piece until it rests directly on the pole face. In this case, each holding protrusion 15 is connected to a notch 14 in the mover portion.
It reaches inside and holds the mover part so strongly that it cannot move in the axial direction. Only after the current supply to the field winding is interrupted does the armature part fall and the retention of the armature part is released, and the armature part becomes movable in the axial direction Y.

[0016] FIG. 4 shows a magnet system with a magnet core according to a variant embodiment. The magnetic core according to this variant embodiment consists of two partial cores 1', 1'', which are divided along the longitudinal axis X with a gap 16. Within these gaps 16, as the case may be, An insert 17 made of non-magnetic material is inserted into the gap 16.

[0017] The embodiment shown in FIG. 4 is provided with one knife-shaped mover part 13, 13' on each side of the magnet system,
It is used for an arrangement in which the armature parts 13, 13 are controlled by passing current through a common field winding 9. In this case, due to the separation of the magnet cores, the effects of backflow from one magnet system side to the other magnet system side are significantly reduced.

[0018] For example, if the knife-shaped mover portions 13' maintain a predetermined distance in the pole pair B, when a current is passed through the field winding, the pole pair B will move away from the mover portion 1.
3' and close the magnetic circuit on this side.
In this state, the other side having the pole pair A is not affected and is similarly attracted if the mover portion 13 maintains a predetermined distance with a time delay.
(The magnetic field lines of pole pair A are not weakened if pole pair B is already attracted to the mover part at the same time.) In the magnet system shown in FIG.
The magnetic core 1 additionally has a central pole piece 18,1
8'. The winding frame is configured to accommodate two partial windings (field windings 19, 19').

[0019] The partial windings are preferably connected in opposite rows or each partial winding is controlled separately.

[0020] FIG. 6 shows a magnet system similar to that shown in FIG. In the embodiment of FIG. 6, half of the pole pieces 3, 4' are formed at both ends of the magnet core 1, respectively. In this case, the transition 20 from each pole piece to each profile 5 is rounded in order to better guide the magnetic flux flow. In this way, transition part 2
Rounding of 0 may be provided in the magnetic core of the above embodiment as the case may be.

[0021] FIG. 7 shows a further embodiment of a magnet system, which is adapted to act on the knife-shaped armature parts 13, 13'. In the embodiment shown in FIG. 7, in order to concentrate the magnetic flux and to increase the force action on each armature section, one stationary magnetically permeable and one weakly magnetic magnet is placed behind each armature section. A member made of material is arranged. In this case, a fixing protection material is provided on the surface of the magnetic flux guide member in order to avoid magnetic "sticking".
This flux guide member is used on the one hand to increase the pulling force and on the other hand to decouple adjacent magnets in order to avoid them influencing each other.

[0022] The spacing between the pole faces of one core end is greater than the spacing between the pole faces of the other core end, so that the magnet system is generally conically shaped.

[0023] Furthermore, in order to increase the wear resistance, the pole faces and, if appropriate, the retaining projections are also surface-hardened or provided with a wear-resistant coating.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnet core.

FIG. 2 is a perspective view of a magnet system according to one embodiment of the invention.

FIG. 3 is a cross-sectional view of the magnet system shown in FIG. 2;

FIG. 4 is a sectional view of a magnet system according to a second embodiment of the invention.

FIG. 5 is a sectional view of a magnet system according to a third embodiment of the invention.

FIG. 6 is a sectional view of a magnet system according to a fourth embodiment of the invention.

FIG. 7 is a sectional view of a magnet system according to a fifth embodiment of the invention.

[Explanation of symbols]

1...Magnetic core, 2...Central part, 3, 3',
4, 4'... Pole piece, 5... Molded part, 6... Pole surface,
7... U-shaped notch, 8... Winding frame, 9... Field winding, 10, 11... Contact piece, 12... Holder, 1
3, 13'...knife-shaped mover part, 14...
Notch, 15... Holding protrusion, 16... Gap, 1
7...Insert body, 18,18'...Pole piece, 19,1
9′...Field winding, 20...Transition part, 21,2
1'...Magnetic flux guide part, A, B...pole pair.

Claims (10)

[Claims] 1. A stop and hold magnet having a double T-shaped weakly magnetic magnetic core, the magnetic core having a spool having a field winding in its central part, the T-shaped core comprising: the end legs as poles of the magnet, each oriented in the longitudinal direction of the magnet, forming a pair of poles on each longitudinal side of the magnet;
In those types in which each of these pole pairs acts on a flat knife-shaped mover part, said pole or pole face 6 has an extension or an extension extending in the direction of the longitudinal axis X of the magnetic core 1. A stop and holding magnet having a molded part 5 and in which a substantially U-shaped cutout 7 is formed on the end face side of the magnetic core. 2. A contact piece 10 for the electrical connection of the field winding is provided in at least one notch 7 on the end face side of the magnet core, and the contact piece 10 is pushed into the winding frame material. 2. The stop and retaining magnet of claim 1, wherein the stop and hold magnet is embedded by injection molding. 3. A grounding contact piece 11 electrically conductively connected to the magnetic core is provided in at least one notch 7 on the end face side of the magnetic core.
A stop and retaining magnet according to claim 2. 4. The distance between the pole faces of one core end is smaller than the distance between the pole faces of the other core end, and a corresponding winding frame is provided,
Claims 1 to 3 whereby the stop and retaining magnet has a conical shape viewed along the longitudinal axis.
The stopping and holding magnet described in any one of the preceding items. 5. The magnetic core 1 has two partial cores 1', each forming a half of the magnetic core.
5. Stopping and holding magnet according to claim 1, characterized in that it is formed by a half-section of 1" and has a separation point along the longitudinal axis X of the magnet core. [Claim 6] The magnet core 1 is an additional pole 1.
8, 18', the pole extending between the two outer poles, and in the winding space formed thereby a field winding 19, 19', respectively, is arranged. , wherein a current in the opposite direction is caused to flow through the field winding when the magnet is activated.
The stopping and holding magnet according to any one of items 5 to 5. [Claim 7] A central pole piece 1 is attached to the magnet core 1.
8, 18' are provided, the central pole pieces each having a pole face oriented in the longitudinal direction of the magnet, with only one half of each T-shaped end on the end face side of the magnet core facing the outer side. configured as poles, the outer pole faces of the outer poles facing each other, the pole faces of the central pole piece and the pole faces of each outer pole being one on each longitudinal side of the magnet; 7. Stopping and holding magnet according to claim 1, wherein the stop and hold magnet forms two pole pairs, and a field winding is assigned to each pole pair. 8. At least one of the stop and hold magnets.
8. The stop according to claim 1, wherein the retaining projections 15 are formed on one longitudinal side and the pole faces and the retaining projections are provided with a surface hardening and/or a wear-resistant coating. and holding magnet. 9. Behind the longitudinally and laterally movable armature parts 13, 13', a stationary, weakly magnetic flux guide member 21, 21' is provided, the flux guide members 21, 21' and Claim 1, wherein a non-magnetic fixed protection material is provided between the movable part and the mover part.
The stopping and holding magnet according to any one of items 1 to 8. 10. Stopping and holding magnet according to claim 1, characterized in that the winding frame consists of two half-shells or partial shells of the same shape surrounding the magnetic core.