JPH0530322Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electromagnet in a shedding mechanism of a loom.

<Prior art> Conventionally, as this type of electromagnet, the electromagnets shown in Figs.
The one shown in the figure is known.

In this electromagnet 71, a protective member 74 made of synthetic resin is molded on a core 73 around which a coil 72 is wound, and an end surface 71a on the side that comes into contact with a member to be attracted (not shown) forms a smooth plane.

<Problems to be solved by the invention> However, in this electromagnet 71, the protective member 74 protrudes as shown by the broken line due to thermal expansion during operation of the loom, which reduces the magnetic attraction force of the electromagnet 71 and prevents malfunction of the loom. The problem was that it was easy to invite.

In view of the above-mentioned problems, the first object of the present invention is to provide an electromagnet that does not cause a decrease in magnetic attraction force during operation of a loom.

Furthermore, a second object of the present invention is to provide an electromagnet that can achieve the same degree of core end face wear prevention effect as the protection member 74.

<Means for Solving the Problems> Therefore, the present invention provides an electromagnet for a shedding mechanism of a loom, which has an end face that is located on the same plane as the end face of the core that the member to be attracted comes into contact with, and that is substantially the same as the core. It is characterized in that an auxiliary member having a coefficient of thermal expansion is arranged around the core.

<Examples> Examples and application examples of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

In FIGS. 1 and 2, the electromagnet 75 has a protective member 78 made of, for example, synthetic resin molded onto the core 7 around which a coil 76 is wound.
An auxiliary member 79 having substantially the same coefficient of thermal expansion as the core 77 extends from the upper and lower rear ends of the drawing.

The protection member 78 is made of polyacetal, but is not limited to this and may be made of other rubber. Furthermore, the protective member 78 only needs to be molded onto the core 77 so as to protect at least the coil 76 .

The auxiliary member 79 is made of gunmetal, but is not limited to this; other alloys, plastics, synthetic rubber, ceramics, etc. may be used as long as they have the same coefficient of thermal expansion as the core 77. can. Further, the auxiliary member 79 is preferably made of a non-magnetic material, but is not limited to this. Further, the auxiliary member 79 may be provided at the upper end, lower end, left and right ends of the core 77, or only at the left and right ends.

In this electromagnet 75, an end surface 75a on the side that is in contact with a member to be attracted (not shown) is formed so that an end surface 78a of a protection member 78 is recessed compared to an end surface 77a of the core 77, as shown in the drawing. When the protection member 78 thermally expands in the high temperature state during operation of the loom, the degree of denting is determined by the end faces 78a of the protection member 78, the core 77, and
77a are positioned on substantially the same plane. Moreover, the end surface 79a of the auxiliary member 79 is
It is determined to be located on the same plane as the end surface 77a of the core 77.

As for the method of attaching the auxiliary member 79 to the core 77, an adhesive is used, but the present invention is not limited to this, and an adhesive tape may be wrapped around both. Furthermore,
Known methods such as welding and screwing can be used.

According to this electromagnet 75, even if the protective member 78 thermally expands during operation of the loom, the end surface 78a of the protective member 78
7 and does not protrude from the core end surface 77a, it is possible to prevent a decrease in the magnetic attraction force.

In addition, at the beginning of the loom operation, the auxiliary member 7
Since the member to be attracted also comes into contact with the end face 79a of the core 78, abrasion and damage to the core 78 can be prevented compared to the case where the member to be attracted is received only by the end face 78a of the core.

Next, an example of application of the electromagnet according to this embodiment will be described.

FIG. 3 shows the configuration of a control device in a passive double-acting dobby machine. Note that this control device is
This is the same as that disclosed in Japanese Patent Application Laid-Open No. 14338/1983.

In this control device 50, a balance rod 3 is pivotally attached to a jack lever 1 which is pivotally attached to a fixed shaft 2 and connected to a heald frame (not shown) via a wire W. Hook parts 4 and 5 whose positions are regulated by a stopper 6 are pivoted.

Behind the balance rod 3, a swinging rod 8 is arranged which is connected to a shaft 7 whose position is fixed and swings, and at both upper and lower ends of the swinging rod 8, brackets 9, 10 and a knife portion 12, 13 is pivoted. Brackets 9 and 10 each have a rod 9 that projects forward.
a, 10a, these rods 9a, 10a
By being supported by the rollers 11, 11, the swinging rod 8 is prevented from tilting during the swinging motion. Each knife portion 12, 13 has a tension coil spring 1 extending from the bracket 9, 10 at its rear end.
4, and is biased in the direction of rotation away from the corresponding hook portions 4 and 5, centering on the pivoted portion. 15 is a stopper.

Between the knife parts 12 and 13, the rear parts are pivotally connected to fixed shafts 16 and 17, respectively, and the knife part 1 is provided at the front end.
Two selection levers 18, 22 are provided with pressing portions 19, 23 for pressing 2, 13. These selection levers 18, 22 are connected to each other by a tension coil spring 26 so as to be spaced apart from the knife parts 12, 13, respectively, and stoppers 27,
The separation distance is regulated by 27.

These selection levers 18, 22 are provided with convex portions 20, 24 and concave portions 21, 25 on mutually opposing surfaces on the rear side.

The protrusions 20 and 24 are portions where pressing protrusions 29a and 29b of the head portion 29 at the front end press the selection levers 18 and 22 when the pusher lever 28, which swings in the vertical direction, is in the forward position. Then, by pressing the convex parts 20, 24 of the pressing protrusions 29a, 29b, the selection levers 18, 22 respectively press the corresponding knife parts 12, 13, and the respective knife parts 12, 13 are engaged with the hook parts 4, 5. Then, the heald frame (not shown) is pulled.

The recesses 21 and 25 are arranged behind each of the convex parts 20 and 24, and the pressing protrusions 29a and 29b of the head part 29 are inserted so that the pusher lever 28, which swings in the vertical direction, does not press the selection levers 18 and 22. It's something you can let go of. When the pusher lever 28 does not press each selection lever 18, 22, the pusher lever 28 has been moved to the reverse position.

The means 30 for vertically swinging the pusher lever 28 is composed of a rotating rod 32 fixed to a fixed swinging shaft 31, and a connecting rod 33 connecting the rotating rod 32 and the pusher lever 28.

The means 34 for moving the push-pusher lever 28 back and forth includes a selector lever 36 to which the rear end of the push-pusher lever 28 is pivoted, and a selector lever 37.
6 and an electromagnet 75 which attracts the attracted portion 37 at the upper end of the selector lever 36.

The selector lever 36 has a pusher lever 28 pivoted at an intermediate portion in the vertical direction, and a lower fixed shaft by connecting a lower bracket 38 to a tension coil spring 39 connected to a frame of the dobby machine (not shown). It is always biased in the clockwise direction in FIG. 3, centering on the portion pivoted to 35.

The selector lever 36 is configured to be swung back and forth by a vibrating member 40 that oscillates back and forth when the upper end attracted portion 37 is not attracted to the electromagnet 75. When the selector lever 36 moves forward, the electromagnet 75 is turned on by a command from a CPU (not shown) that stores pattern information corresponding to the weaving pattern of the loom, and the selector lever 36 maintains the forward position.

Note that the rotating rod 32 and the swinging rod 8 are configured to periodically reciprocate in synchronization with each other, and the vibrating member 40 is connected to the other rotating rods 32 and the swinging rod 8.
The rotating rod 3 moves reciprocatingly at twice the period of
2 is at the bottom dead center and top dead center respectively.

In this control device 50, when the heald frame is towed, the electromagnet 75 is turned on based on a command from a CPU (not shown). Then, the selector lever 36 maintains the forward position, and in this state, the pusher lever 28 is oscillated in the vertical direction by the oscillating means 30, and the pressing protrusion 2 of the head portion 29 is moved.
9a, 29b are the convex portions 2 of each selection lever 18, 22
By pressing 0, 24, the knife portion 12,
13 engages with the hook portions 4 and 5, respectively, and the heald frame is pulled.

In addition, when the heald frame is not towed, the electromagnet 7
5 is not turned on by the CPU. Then, the selector lever 36 is swung back and forth as the vibration member 40 moves. The pusher lever 28 is then swung up and down by the oscillating means 30,
The pressing protrusions 29a and 29b of the head portion 29 try to press the respective selection levers 18 and 22. However, when the pressing protrusions 29a and 29b are at the bottom dead center or the top dead center, the vibration member 40 and the selector lever 3
6, since the pusher lever 28 is arranged at the rearmost position, each of the pressing protrusions 29a, 2
9b is the recess 21, 25 of each selection lever 18, 22.
, the selection levers 18 and 22 do not press the knife portions 12 and 13, and the heald frame is not pulled.

<Operations and Effects of the Invention> As explained above, the present invention provides an auxiliary member that has an end face located on the same plane as the end face of the core with which the member to be attracted comes into contact and has a coefficient of thermal expansion that is approximately the same as that of the core. Since the electromagnet is disposed around the core, it is possible to prevent the protective member from protruding during operation of the loom and reduce the magnetic attraction force as in the conventional example, thereby preventing the loom from malfunctioning. Further, since the adsorbed member also comes into contact with the end face of the auxiliary member, wear and damage to the core end face can be prevented in substantially the same manner as in the conventional example.

In addition, if the space between the core and the non-magnetic material is filled with a protective material as in the above-mentioned embodiment, it is possible to protect the coil and increase the contact area with the attracted member, thereby preventing wear and damage of the core. can be further prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a diagram showing an example of application of the embodiment. FIG. 4 is a sectional view of a conventional example, and FIG. 5 is a perspective view thereof. 75...Electromagnet, 76...Coil, 77...Core, 77a...End face thereof, 78...Protection member, 7
9...Auxiliary member, 79a...End face thereof.

Claims (1)

[Claims for Utility Model Registration] An auxiliary member which is an electromagnet in a shedding mechanism of a loom, and which has an end face located on the same plane as the end face of the core with which a member to be attracted comes into contact, and which has substantially the same coefficient of thermal expansion as said core. An electromagnet comprising: arranged around the core.