JPS6234308Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a center stop used in a table or wall clock, and is an attempt to improve the structure. Center stop is a method of fixing the mounting plate and mechanism by arranging a screw and nut coaxially with the pointer, and has been the most commonly used method, but it lacks consistent thought throughout movement design. As a result, all of them had complicated structures, poor reliability, large dimensions, and poor aesthetic appearance.

In this invention, a pipe-shaped cylindrical member is press-fitted or inserted in a non-rotatable manner into the main plate, which is the base plate that constitutes the movement, the body of the clock shaft is supported by the hole in this pipe, and the outside diameter of the pipe is threaded and a nut is inserted. The aim is to devise a center set screw that fits together, simplify the configuration, and improve reliability and appearance. The explanation will be given below according to the drawings.

Figure 1 is a cross-sectional view showing the conventional structure, where 1 is a mounting plate, 2 is a capsule containing a movement,
2' is a capsule lid, 3 is a set screw fitted into the capsule 2, and 4 is a nut which is screwed into the set screw 3 to fix the capsule 2 and the mounting plate 1. 5 is a second hand axis, 6 is a minute hand axis, and 7 is an hour hand axis. 8 is a substrate A, 9 is a substrate B, and 10 is a volume surrounded by the substrates A and B, in which movement parts such as a motor and a speed reducer are housed. Reference numeral 11 denotes a second hand wheel driven by a speed reducer, which integrally has a second hand shaft 5.
12 is a minute hand wheel to which the minute hand shaft 6 is fixed, and a second hand wheel 11
It rotates while being decelerated by a transmission wheel (not shown). 13 is a volume formed by the substrate A8 and the capsule 2, and includes a sun wheel and a minute wheel 1 (not shown).
2. The hour hand wheel 14 is housed. 15 is a center pipe, which is caulked perpendicularly to the substrate A8. The hole in the center pipe 15 supports the diameter of the second hand shaft 5 on the pointer side. The outer diameter of the center pipe 15 supports the hole of the minute hand shaft 6 . Furthermore, the hole of the hour hand shaft 7 is fitted into the outer diameter of the minute hand shaft 6 and is pivotally supported. The second, minute, and hour axes are supported in a cylindrical layered manner by the substrate B9, the substrate A8, and the central pipe 15 fixed to the substrate A8. Therefore, the rotation axis of the hour hand shaft 7 is regulated by the movement body constituted by the substrates A and B. On the other hand, the set screw 3 is non-rotatably fitted into the capsule 2 as described above. The movement body is assembled into the capsule 2 by relying on the fitting part 16.
If the positioning configuration is described from the set screw 3, the set screw 3 and the capsule 2, the capsule 2 and the board A8, the board A8 and the center pipe 15, the center pipe 15 and the minute hand shaft 6, and the minute hand shaft 6 and the hour hand shaft 7. determined in sequence. As a result, errors accumulate between the set screw 3 and the hour hand shaft 7. If the outer diameter of the hour hand shaft 7 that is moving due to this error hits the inner diameter hole of the set screw 3, the timepiece will stop. To avoid this, the hour hand axis 7
A considerable gap 17 is required between the set screw 3 and the set screw 3. If the gap 17 is required, dust will enter through this gap and the clock will easily stop. Moreover, the outer diameter of the nut 4 increases due to the gap 17, which detracts from the aesthetic appearance of the watch. Furthermore, the structure is complicated, such as requiring a central pipe 15. FIG. 2 is a sectional view showing another conventional structure. The set screw 3 is fixed to the capsule 2 as in FIG. The minute wheel 12 is connected to both sides by a board C18 and a board D19.
is supported by a pivot and stands upright. Second hand axis 5 is minute hand axis 6
It is supported by the inner diameter of the board B9 and the hole of the board B9. The hour wheel 14 is fitted onto and supported by the minute hand shaft 6 with the substrate C18 in between. Therefore, the rotation axis of the hour hand shaft 7 is regulated by a movement body whose elements are the substrate C18 and the substrate D19. Similar to the explanation in FIG. 1, the positional error between the set screw 3 and the hour hand shaft 7 is large, and a gap 17 is also required. In FIG. 2, the substrate is complicated, requiring three layers B, C, and D and a capsule 2. It is presumed that the conventional example shown in Figures 1 and 2 was constructed based on a design idea in which the pointer shaft was made to stand up on the movement body, and then a set screw 3 was separately added to fix it to the mounting plate 1. . Solving the above concerns requires a significant shift in thinking. We considered what would happen if the hour hand shaft 7 was supported in the hole of the set screw 3, and if another pointer shaft was coaxially supported in the hole in the supported hour hand shaft 7. It seems like the center pipe 15 in FIG. 1 or the board C18 in FIG. 2 can be deleted. The idea is that in the past, even if the set screw 3 is removed, each pointer shaft stands firmly, but with the configuration of the present invention, when the set screw 3 is removed, the pointer shafts become wobbly. . FIG. 3 is a cross-sectional view according to the present invention. 20 is a base plate, and 21 is a center set screw, which is the subject of the present invention. The center set screw 21 is inserted into the base plate 20 so as not to rotate. Hour wheel 14
The shaft 7 is fitted into the hole of the center set screw 13 as a bearing and is supported. 22 indicates the pivot point of the hour hand shaft 7.
Next, the shaft 6 of the minute wheel 12 is fitted and supported by the hour hand shaft 7 as a bearing. 23 indicates its pivot point. Next, the substrate D19 is assembled onto the base plate 20. 22'2
3' is a pivot point that is a pair of pivot points 22 and 23. Next, the shaft 5 of the second hand wheel 11 is inserted into the hole of the minute hand shaft 6 as a bearing and is supported. 24 indicates its pivot point. Next, substrate B9 is assembled. 24' is a pivot point that is a pair of pivot point 24. 25 is a space into which a Hinoura car (not shown) can also fit. Although not shown, 26 is a space in which a motor and a reduction gear connected thereto are also accommodated. A minute transmission wheel (not shown) is provided so as to pass through the substrate D19.
The completed movement body is fixed to the mounting plate 1 by passing the center set screw 21 through the hole in the mounting plate 1 and screwing in the nut 4. If you remove the center set screw 21 and look at FIG. 3, you will see that each axis, including the hour hand axis 7, is wobbly. This shows that the center set screw 21 not only has the function of fixing it to the mounting plate 1, but also that the hole of the center set screw 21 has the function of effectively supporting the pointer shaft.

The center set screw 21 has a flange-like flange 26, and when the center set screw 21 is inserted into the base plate 20, the flange 26 fits into the ring groove 27 of the base plate 20. A part of the notch 28 of the collar 26 is a ring groove 27
It is in contact with the base plate surface 29 where there is no surface. The collar 26 fits into the base plate 20 but does not rotate. Therefore, when the nut 4 is screwed in, the center set screw 21 will not rotate with it. This combination may be reversed so that the base plate 20 has a protrusion that engages with the center set screw 21 to prevent rotation. More spit 26
may be in the shape of a hexagonal nut, which may fit into a hexagonal recess cut into the base plate 20 to prevent rotation. Furthermore, the center set screw 21 may be press-fitted into the base plate 20. Furthermore, the center set screw 21 is attached to the base plate 2.
0 may be integrally molded. Figure 4-A shows
FIG. 3 is a sectional view of the center set screw 21, and FIG. 4-B is a plan view. The center set screw 21 has a pipe shape. 30 is the diameter that fits into the main plate 20, 3
1 is an external screw, and 32 is a bearing hole that supports the hour hand shaft 7. FIG. 5 is a partial plan view of the base plate 20 of FIG. 3 viewed from inside. 27 is a ring groove cut into the base plate into which the collar 26 of the center set screw 21 is inserted. 2
Reference numeral 9 is a base plate surface without a groove, and the notch 28 of the center set screw 21 comes into contact with it. The collar 26 is in the ring groove 27
It will not rotate once it is inserted into the position. With this shape of the base plate, the material of the base plate 20 is preferably synthetic resin. The effects of the present invention are as follows. Compared to the conventional example shown in FIG. 1, the center pipe 15 is not required. Similarly, compared to FIG. 2, the substrate C18 is no longer necessary. Since the center set screw 21 bears the diameter of the hour hand shaft 22 as shown at the pivot point 22, there is no need for a gap 17 as in the conventional case, thereby preventing the intrusion of dust. Furthermore, the outer diameter of the nut 4 can be reduced accordingly.

In addition, the span for supporting both ends of the pointer shaft is lengthened by the protrusion of the center set screw 21, and the perpendicularity of the shaft, that is, the parallelism of the hands is improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional structure, Fig. 2 is a sectional view showing another conventional structure, Fig. 3 is a sectional view according to the present invention, and Fig. 4-A is a sectional view of the center set screw in Fig. 3. Figure 4-B is the same plan view, and Figure 5 is the 3rd view.
A partial plan view of the main plate shown in the figure from the inside, 1...Mounting plate, 4...Metsu, 7...Hour hand axis,
20...Main plate, 21...Center set screw, 31...
external screw.

Claims (1)

[Scope of utility model registration request] In a structure in which the mechanism is fixed to the mounting plate by tightening a nut coaxial with the pointer, the pipe-shaped center set screw has a hole that bears the diameter of the hour hand shaft and an external thread into which the nut is to be fitted; A center stopper characterized in that the hole in the bearing shaft of the hour hand bears another pointer shaft coaxially on the inner side, and the center set screw is press-fitted, inserted, or integrally molded into the base plate constituting the mechanism in a non-rotatable manner. structure.