JPS6349097Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic actuator, and particularly relates to an electromagnetic actuator that operates within a space formed by a pair of opposing magnetic plates and a spacer made of synthetic resin that sets the distance between the two magnetic plates. a magnetic field generator that generates a magnetic field, and an excitation coil that is powered from a power supply source fixed within the device body and supported on a support so that it can reciprocate under the influence of the magnetic field in the space. The present invention relates to an electromagnetic actuator equipped with an electromagnetic actuator.

[Prior Art] Conventionally, as this type of electromagnetic actuator, an electromagnetic actuator for sewing machines has been proposed, which is described in the specification of Utility Model Application No. 176,230/1987, which was previously filed by the present applicant. In this electromagnetic actuator, an excitation coil is supported on a rotating body rotatably supported by a magnetic plate, and an insulating substrate provided with an input terminal for an excitation current for the excitation coil is fixed to the side surface of the spacer. The excitation coil and the input terminal are connected by flexible connection means. Thereby, power can be supplied to the excitation coil without interfering with the rotation of the rotating body.

[Problems to be solved by the invention] However, in the conventional electromagnetic actuator, the flexible connection means curves and deforms as the rotating body rotates, so it cannot be installed in the limited space of the sewing machine frame. The electrical insulation part of the flexible connection means may come into contact with the circuit board and various parts of the sewing machine, and if it wears out, it may cause accidents such as short circuits and leakage of the parts on the circuit board. There was a risk that it would develop into

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to prevent contact between the flexible connection means and each member arranged inside the device body with a simple structure. The object of the present invention is to provide an electromagnetic actuator that can be used.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a flexible connecting means 1 for connecting a power supply source fixed in the main body of the device and an excitation coil. A storage part that forms a storage chamber with a size determined according to the amount of deflection of the flexible connection means related to the reciprocating motion of the excitation coil is integrated with a synthetic resin spacer that sets the distance between the pair of magnetic plates. It is characterized by being molded.

[Function] Due to the characteristic configuration of the present invention, the flexible connection means can be freely curved in the storage chamber without interfering with the reciprocating movement of the excitation coil, and the storage section made of synthetic resin allows the flexible connection means to be bent freely within the device body. Completely electrically insulated from each member.

[Embodiment] Hereinafter, an embodiment in which the present invention is applied to an electromagnetic actuator for a sewing machine will be described with reference to the drawings.

In FIGS. 1 and 2, a front yoke 1 and a back yoke 2 facing each other are provided as a pair of magnetic plates, and both yokes 1 and 2 are parallel to each other so that they are spaced at a predetermined distance by a spacer 3, which will be described later. placed in the state. Four flat permanent magnets 4 are arranged as magnetic field generators on the wall surface 2a of the back yoke 2 facing the front yoke 1, and each permanent magnet 4 is magnetized in the direction of its plate thickness. There is a gap between them. Two adjacent permanent magnets 4 are arranged with opposite polarities to generate a uniform magnetic field, and as shown in FIG. 1, two sets of uniform magnetic fields are formed vertically by the four permanent magnets 4. Ru. In the air gap between the front yoke 1 and the permanent magnet 4,
Rotating bodies 5 and 6 made of synthetic resin that can rotate on a plane perpendicular to the direction of the uniform magnetic field are arranged as supports, and these rotating bodies 5 and 6 are arranged in a fan-shaped manner wound within the plane. It is integrally molded with the excitation coils 7 and 8 inserted therein.

The rotating body 5 located at the upper side in FIG. 1 drives a needle swinging mechanism for setting the horizontal swing position of the sewing needle of the sewing machine, and the rotating body 5 fixed to the back yoke 2 rotates. It is attached to a rotating shaft 9a of a position detection potentiometer 9 with a screw 10. On the other hand, the rotary body 6 located at the bottom in FIG. 1 drives a feed adjuster that controls the feed movement of the feed dog of the sewing machine, and is used to detect the rotational position of the rotary body 6 fixed to the back yoke. It is attached to the rotating shaft 11a of the potentiometer 11 by a screw (not shown), and is connected to the feed adjuster via a sector gear 12 fixed to the rotating shaft 11a. Flexible printed wiring boards 13 and 14 are provided as flexible connection means to connect the excitation coils 7 and 8 to a power supply source (not shown) fixedly arranged within the sewing machine frame, and a pair of flexible printed circuit boards 13 and 14 are provided as flexible connection means. An insulating board 15, 1 on which terminals are printed and wired.
6 are fixed to both ends of each of the flexible printed wiring boards 13 and 14. As shown in FIG. 3, the insulating substrate 15 is inserted into each of the rotating bodies 5 and 6 during molding and is fixed to each rotating body, and the insulating substrate 15 is attached to the rotating bodies 5 and 6, the excitation coils 7 and 8, and the flexible printed wiring board. 13 and 14 are integrally insert molded into a unit as shown in FIG. Furthermore, in this embodiment, in order to firmly fix the excitation coils 7 and 8 to the rotating bodies 5 and 6, synthetic resin for molding is injected into the outer and inner circumferential parts of the excitation coils and the rotating bodies 5 and 6 are fixed to each other. , 6 are formed.

Now, to explain in detail about the spacer 3 that sets the interval between the front yoke 1 and the back yoke 2, the spacer 3 is molded from transparent synthetic resin, and has a partition surface that determines the arrangement space for the two left and right permanent magnets 4. 17 and 18 above and below, and a plurality of protrusions 19 that abut against the yokes 1 and 2 in order to set the interval between the yokes 1 and 2;
It further has a through hole (not shown) for a screw shaft 20 fixed to the back yoke 2 for tightening the screw shaft 2. Further, on the outer circumference of the spacer 3, a side wall portion 21 that is wider than the protrusion 19 by the thickness of both yokes 1 and 2 is provided.
is formed, and a storage wall portion 22 is formed outside the side wall portion 21 located on the right side in FIG.
The side wall portion 21 and the storage wall portion 22 are connected by a bottom wall portion 23. In this embodiment, the side wall portion 21, the storage wall portion 22, and the bottom wall portion 23 constitute a storage portion, and the width of the storage chamber formed by the storage portion is the size of the flexible printed wiring board 1.
It is determined according to the amount of deflection of Nos. 3 and 14.

In order to attach the insulating substrate 16 of the flexible printed wiring boards 13 and 14 to the spacer 3, a mounting recess 24 is formed between the side wall portion 21 and the storage wall portion 22 as shown in FIGS. 4 and 5. The insulating substrate 16 is inserted into the mounting recess 2 from the left in FIG.
4 and is installed. Its mounting recess 2
4, the elastic mounting side 25 is attached to the storage wall part 22 so as to face inside.
A locking portion 26 is formed at the free end of the insulating substrate 16 to extend leftward in FIG.
It is adapted to engage with a notch 27 provided in the. The elastic mounting piece 25 allows the insulating substrate 16 to be removably mounted to the mounting recess. 2 terminals for each insulating board 16 to connect a pair of terminals of the insulating board 16 to the power supply source of the sewing machine.
Connecting wires 28 of books are prepared, and those connecting wires 28
is an elastic holding piece 2 formed protruding from the storage wall portion 22.
9 and the outer peripheral surface of the storage wall portion 22.

To briefly explain the assembly order of the electromagnetic actuator of this embodiment configured as described in detail above, first, both potentiometers 9 and 10 are assembled.
Both potentiometers 9 and 10 are fixed to the back yoke 2 with the rotation shafts 9a and 11a protruding through the through holes (not shown) drilled in the back yoke 2, and then the spacer 3 is fixed. The spacer 3 is assembled to the back yoke 2 by fitting the screw shaft 20 on the back yoke 2 into a through hole (not shown). In this state,
Rotation shafts 9a, 10 of both potentiometers 9, 10
The rotating bodies 5, 6 and a connecting member such as a sector gear 12 are fixed to a with screws 10, and the screw shaft 20 is fitted into a through hole 8 (not shown) drilled in the front yoke 1. Assemble to the spacer 3 and back yoke 2. And flexible printed wiring board 1
3 and 14 insulating substrates 16 and a plurality of connection wires 28 are soldered. In this example, the first
As shown in the figure, since the front yoke 1 is formed so as not to cover the above-mentioned storage section, the wiring board 16 is removed from the wiring board 16 when the insulating board 16 is removed from the mounting recess 24 for soldering work. , 14 and the front yoke 1 do not interfere with each other.

The present invention is not limited to the embodiments described in detail above, and various changes can be made without departing from the spirit thereof.

For example, in this embodiment, the excitation coils 7, 8
are carried on the rotating bodies 5 and 6, but they may be supports that reciprocate linearly, and fixedly arranged field coils may be used instead of the permanent magnets 4 of this embodiment. good. Further, in this embodiment, the electromagnetic actuator is disposed within the sewing machine frame and used for driving sewing needles, etc., but it can also be used for equipment other than sewing machines.

[Effects of the invention] As is clear from the detailed description above, the present invention provides a method for accommodating the flexible connecting means that connects the power supply source and the excitation coil according to the amount of deflection of the flexible connecting means. By integrally molding the storage part that forms a storage chamber with a specified size with a synthetic resin spacer that sets the distance between a pair of magnetic plates, it is possible to prevent contact between the flexible connection means and each member inside the device body. This can be completely prevented, and the structure of the storage section is extremely simple, which has the practical effect of ensuring electrical safety at low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an electromagnetic actuator for a sewing machine, which is an embodiment of the present invention, with a part of its front yoke cut away; Fig. 2 is a right side view of the electromagnetic actuator shown in Fig. 1; 3 is an enlarged perspective view showing the structure of the rotating body and the flexible printed wiring board, FIG. 4 is a plan view showing the mounting recess for the spacer, the elastic mounting piece, and the elastic holding piece taken out, and FIG. 5
The figure is a right side view of the spacer shown in FIG. 4. 1: Front yoke, 2: Back yoke, 3: Spacer,
4: Permanent magnet, 5, 6: Rotating body, 7, 8: Excitation coil, 13, 14: Flexible printed wiring board, 16: Insulating board, 21: Side wall, 22: Storage wall, 23: Bottom wall, 25: Elastic mounting piece, 28:
Connection line, 29: elastic holding piece.

Claims (1)

[Claims for Utility Model Registration] 1. A magnetic field generator 4 that generates a magnetic field in a space formed by a pair of opposing magnetic plates 1 and 2 and a spacer 3 made of synthetic resin that sets the distance between the two magnetic plates. and excitation coils 7 and 8 supported on supports 5 and 6 so as to be powered from a power supply source fixed within the device body and capable of reciprocating motion under the influence of the magnetic field in the space. In the electromagnetic actuator, the power supply source and the excitation coil are connected by flexible connection means 13, 14, and in order to accommodate the flexible connection means 13, 14, the excitation coils 7, 8 are connected to each other in a reciprocating motion. A storage part (21 to 23) forming a storage chamber of a size determined according to the amount of deflection of the flexible connection means 13, 14 is integrally molded with the spacer 3, and the storage part (21 to 23) An electromagnetic actuator, characterized in that contact between each member disposed within the device body and the flexible connecting means 13, 14 is prevented. 2. The flexible connection means 13, 14 are connected to the excitation coils 7, 8 at one end thereof, and have a connection body 16 provided for connection with the power supply source fixed to the other end thereof. Connection body 1
2. The electromagnetic actuator according to claim 1, wherein an elastic mounting piece 25 is integrally molded with the spacer 3 in order to detachably attach the actuator 6 to the spacer 3. 3. Utility model registration claim No. 3, characterized in that an elastic holding piece 29 is integrally molded with the spacer 3 in order to hold a plurality of connection wires 28 connecting the connection body 16 and the power supply source. The electromagnetic actuator according to item 2.