JPH0533095U - Fixing structure of coil assembly in instruments - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a fixing structure for a coil assembly in an instrument in which the coil plate and the fulcrum shaft are well seated with respect to the main plate in the instrument case. [Structure] A tip portion 6a of a fulcrum shaft 6 into which a movable plate 7 movable by a magnetic field generated by a coil 1 is fitted is press-fitted into a hole 4a provided in a part of a coil plate 3. The tip 6a
Is held by a hole 5a provided in the main plate 5, and the coil plate 3 to which the coil 1 is attached is attached to the main plate 5 of the instrument case. A screw is inserted from the rear end of a hole 6c formed in the front and rear ends of the center of the fulcrum shaft 6, and the main plate 5
The fulcrum shaft 6 through the hole 5a provided in the base plate 5
It was fixed to the case 10 located in the front part of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing structure for a coil assembly in an instrument, and more particularly to a fixing structure for a fulcrum shaft that supports a movable plate sucked by the operation of a coil.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, coil assemblies in instruments have been shown in the exploded view of FIG. The assembling method is as follows. First, the movable plate 7 sucked by the operation of the coil 1 is fitted to the fulcrum shaft 6, and the bush 8 for preventing the movable plate 7 from coming off is press-fitted to the rear end of the fulcrum shaft 6. To do. The tip step 6b (see FIG. 3) of the fulcrum shaft 6 is press-fitted into the hole 4a of the arm 4 of the coil plate 3 to complete the fixing of the fulcrum shaft 6. In this case, the tip portion 6a having a smaller diameter than the tip step portion 6b of the fulcrum shaft 6 penetrates through the hole 4a of the arm 4 and is rotatably fitted in the hole 5a of the main plate 5. Next, align the positioning boss 2b provided on the yoke portion 2 of the coil 1 with the positioning hole 3b formed in the coil plate 3, and screw in from the upper side of the mounting hole 3a of the coil plate 3. The coil plate 3 is inserted and fixed in the screw hole 2a of the yoke portion 2 with a screw to fix the coil plate 3 to the yoke portion 2.

Next, the tip of the fulcrum shaft 6 is moved so that the needle of a three-needle assembly (not shown) screwed to the recording needle support portion 7b set on the movable plate 7 comes to a predetermined position. The coil assembly is rotated with respect to the main plate 5 around 6a to complete the position adjustment. Then, the screws are inserted from the lower side of the two mounting holes 2c formed in the yoke portion 2 of the coil 1, and the coil assembly is mounted on the main plate 5 through the mounting holes 3c of the coil plate 3 (screw holes of the main plate 5). Is not shown). Further, the attraction portion 7a of the movable plate 7 is located at a position facing the end portion of the coil 1, and normally, the attraction portion 7a is biased by the spring 9 in a direction away from the end portion of the coil 1. The bottom side of the instrument case is downward in this figure.

In this state, when an input signal is applied to the coil 1 and a magnetic field is generated, the attracting portion 7 a of the movable plate 7 is attracted by the coil 1 against the urging force of the spring 9, and the movable plate 7 moves. It rotates about the fulcrum shaft 6 as a fulcrum. As a result, the position of the needle of the three-needle assembly screwed to the recording needle support portion 7b of the movable plate 7 is changed, and information is recorded.

[0005]

[Problems to be solved by the device]

 However, as described above, the method of fixing the fulcrum shaft 6 is such that the tip step 6b of the fulcrum shaft 6 is press-fitted into the hole 4a of the arm 4 of the coil plate 3 and the tip 6a is provided in the base plate 5. Since it is held by 5a, if the mounting hole 3c for attaching the coil plate 3 to the base plate 5 and the fulcrum shaft 6 are too far apart, or if the arm 4 of the coil plate 3 is narrowed, the fulcrum shaft 6 will not move. Since there is a slight gap between the tip portion 6a and the hole 5a of the base plate 5, the fulcrum shaft 6 is not well seated on the base plate 5 and the recorded image is disturbed, resulting in lack of stability.

An object of the present invention is to provide a fixing structure for a coil assembly in an instrument in which the coil plate and the fulcrum shaft are well seated with respect to the main plate in the instrument case.

[0007]

[Means for Solving the Problems]

 According to the present invention, a coil plate with a coil attached is attached to a main plate of an instrument case, and a front end step portion of a fulcrum shaft on which a movable plate movable by a magnetic field generated by the coil is fitted is part of the coil plate. In the fixing structure of the coil assembly in the instrument in which the tip portion is press-fitted and held by the hole provided in the main plate, the hole is bored across the front and rear ends of the shaft center of the fulcrum shaft. The fulcrum shaft is fixed to a case located in the front part of the main plate through the hole provided in the main plate by inserting a screw into the hole from the rear end of the fulcrum shaft. There is.

[0008]

[Action]

 Based on the above configuration, since the fulcrum shaft is screwed to the case so as to sandwich the base plate, the fulcrum shaft sits well on the base plate, and therefore the fulcrum position of the movable plate actuated by the coil is stable. The ground plate is also fixed to the case by the fulcrum shaft, so the position is stable.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. Since the main structure of the instrument of the present invention in which the coil assembly is fixed is different from the conventional structure in the fulcrum shaft, other same parts are denoted by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows an exploded perspective view of the fixing structure of the coil assembly in the instrument of the present invention, in which a hole 6c is formed in the center of the fulcrum shaft 6 at the front and rear ends thereof. A boss 10 is provided upright as a part of the case at the front part (upper side in the figure) of the hole 5a of the main plate 5, and the boss 10 is provided with a screw hole 10a. Then, in the method of fixing the coil assembly, first, the tip end step 6b of the fulcrum shaft 6 into which the movable plate 7 is fitted is press-fitted into the hole 4a of the arm 4 of the coil plate 3. Next, the coil plate 3 to which the coil 1 is attached is attached to the base plate 5 while holding the tip portion 6a of the fulcrum shaft 6 in the hole 5a of the base plate 5. Further, by inserting a long screw through the hole 6c at the rear end of the fulcrum shaft 6 and screwing the screw into the screw hole 10a of the boss 10 of the case, the fixing of the fulcrum shaft 6 is completed, and the fulcrum shaft 6 is fixed. The base plate 5 is sandwiched between the shaft 6 and the boss 10 of the case.

[0011]

[Effect of the device]

 As described above, according to the present invention, a hole is formed in the front and rear ends of the center of the fulcrum shaft, and a screw is inserted into the hole from the rear end of the fulcrum shaft to provide the ground plate. Since the fulcrum shaft is fixed to the case located in the front part of the ground plate through the hole, the fulcrum shaft sits well on the ground plate, so that the fulcrum position of the movable plate can be stabilized. Further, since the main plate is also fixed to the case by the fulcrum shaft, the position is stable and the number of parts for fixing the main plate to the case can be reduced, which leads to a reduction in manufacturing cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a fixing structure of a coil assembly in an instrument of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a fixing structure for a coil assembly in a conventional instrument.

FIG. 3A is a perspective view of a fulcrum shaft, and FIG. 3B is a cross-sectional view showing a state in which the fulcrum shaft is fitted in a hole of a main plate so as to sandwich a coil plate.

[Explanation of symbols]

 1 coil 3 coil plate 5 base plate 6 fulcrum shaft 7 movable plate 10 case (boss)

Claims (1)

[Scope of utility model registration request] 1. A coil plate to which a coil is attached is attached to a base plate of an instrument case, and a tip step portion of a fulcrum shaft on which a movable plate movable by a magnetic field generated by the coil is fitted is provided in a part of the coil plate. Press-fit into the hole
And, in the fixing structure of the coil assembly in the instrument in which the tip portion is held by the hole provided in the main plate, a hole is bored across the front and rear ends of the shaft center portion of the fulcrum shaft, and the rear end of the fulcrum shaft is formed. Fixing the coil assembly in the instrument, characterized in that the fulcrum shaft is fixed to the case located in the front part of the main plate by inserting a screw from the end into the hole and passing through the hole provided in the main plate. Construction.