JPS6329267Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a phase correction mechanism in a drum drive device such as a watch, which allows the phase adjustment of an hour drum and a minute drum to be easily performed.

In the past, when adjusting the phase of the hour and minute hands, there were two methods: first, by press-fitting, and secondly, by adjusting the phase of the hour and minute hand pipes in advance.

In the case of the first method, when the drum is used, it becomes heavy and puts a large burden on the hour and minute hand pipes, and there is a risk that it will not work with a low-torque clock movement.
Also, if it is accidentally press-fitted, it must be pulled out, but care must be taken not to damage the drum etc., so it is difficult to pull it out easily.

Furthermore, in the case of press-fitting, elastic deformation occurs on the press-fitted side and the press-fitted side, but care must be taken to avoid permanent deformation of the parts during press-fitting and pulling out.

The second method has the drawback that it requires many man-hours for phase alignment when assembling the timepiece movement, and that it requires phase alignment between the drum and the outer periphery printing, resulting in high costs.

Specifically, as shown in FIG. 1, the hour hand wheel 1 and the minute hand wheel 2 are provided with chamfered portions 3 and 4, and these are aligned in phase with the minute drum and the hour drum. The portion 3 and the hole 3A, the chamfered portion 4 and the hole 4A are set in the same relationship, and the holes 3A and 4A are assembled so as to overlap in the same position for phase matching.

In addition, when using the minute drum and hour drum, the freeing part of the minute hand pipe must also be made into an irregularly shaped hole so that the chamfered parts 3 and 4 can fit in, and the letter printing on the outer periphery of the drum must also be in phase with the irregularly shaped hole. However, there was a drawback that the assembly man-hours and parts accuracy were a major factor in increasing costs.

The present invention has been devised in view of these points, and its contents will be explained below based on the illustrated embodiments.

10 is the clock movement and the center screw part 1
1. The hour hand pipe 12, minute hand pipe 13, second hand shaft, etc. are connected in a protruding manner as in a normal watch.

15 is a second hand pipe connected to the second hand shaft 14, and a second hand 16 with an interior design is attached to the top of the pipe.

The center screw portion 11 described above penetrates and projects through the center hole 18 of the pedestal 17 and the center hole 20 of the transparent cylindrical case 19, while the lock nut 22 has a fall prevention cylindrical portion 23 protruding in the axial direction. It is tightened and fixed with an internal screw 21. That is, the base 17 and the case 19 are clamped and fixed by the center screw portion 11 and the lock nut 22.

Reference numeral 24 denotes a fall-preventing annular protrusion formed inside the tip of the fall-preventing cylindrical portion 23 of the lock nut 22, which loosely fits and holds a part of the hour hand pipe 12.

This extension of the fall-prevention tube portion 23 prevents the hour hand pipe from falling relative to the timepiece movement 10, and prevents loss of excess rotational torque.

Furthermore, preventing the hour hand pipe 12 from falling also prevents the minute hand pipe 13 and second hand shaft 14 from falling.

In this embodiment, the prevention annular protrusion 24 is formed, but it goes without saying that the annular protrusion may be formed on a part of the hour hand pipe 12 instead. The important point is that the lock nut 22 has a fall-preventing cylindrical portion 23 extending in the axial direction.

Reference numeral 25 denotes a loosely fitting receiving portion of the lock nut 22, which is formed into a stepped shape and is loosely fitted to the inner cylindrical portion 27 of the hour drum 26, and this loosely fitting receiving portion 25 receives the weight of the hour drum 26. .

That is, at this time, by loosely fitting the drum 26 into the lock nut 22, the weight of the drum 26 is received by the loose fit receiving portion 25 of the lock nut 22, thereby reducing the load on the timepiece movement 10.

Reference numeral 28 denotes a square fitting protrusion formed at the tip of the hour hand pipe 12, which is designed to fit into the square hole 29 when the hour drum 26 is loosely fitted into the lock nut 22. is the shoulder 30 of the hour hand pipe 12
and give its own weight to the clock movement 10,
Since the fitting is a press fit, no dead weight is applied to the clock movement 10. By fitting the square fitting protrusion 28 and the square hole 29, the hour drum 26 rotates integrally with the hour hand pipe 15.

Specifically, since the square fitting protrusion 28 is square, there are only four directions in which it can be attached. Therefore, the hour drum 26 can be easily attached to the hour hand pipe 12.

From 1 o'clock to 12 o'clock, 1
Time display characters 31 are printed at hourly intervals. 3
2 is a washer disposed at the top of the inner cylindrical portion 27 of the hour drum 26 and receives the stepped portion 35 of the downwardly projecting cylindrical portion 34 of the minute drum 33. This washer 32 has a function of avoiding friction between the minute drum 33 and the hour drum 26.

That is, the minute drum 33 is placed on the inner cylindrical portion 27 of the hour drum 26 via the washer 32.
3 is applied to the hour drum 26.

Time display characters 36 are printed on the circumferential surface of the minute drum 33 in 1 minute increments from 0 to 59 minutes.
Also, a time display line 37 is printed on the circumferential surface of the case 19, and time display characters 31, 3 on the drums 26, 33 that overlap with this time display line 37 are printed on the circumferential surface of the case 19.
6 indicates the current time.

38 is a phase pinion that is press-fitted into the square protrusion of the minute hand pipe 13. Reference numeral 39 denotes a fitting tooth portion formed on the outer periphery of the phase pinion 38 so as to fit with an inner tooth portion 40 provided inside the downwardly protruding cylindrical portion 34 of the dividing drum 33.

Therefore, to connect the minute drum 33 and the minute hand pipe 13, first, the phase pinion 3 is attached to the square protrusion of the minute hand pipe 13.
8 and press-fit the fitting teeth 39 of the phase pinion 38.
The inner teeth 40 of the downwardly protruding cylindrical portion 34 are fitted to the minute hand pipe 13, so that all of the weight is applied to the hour drum 26 without giving any weight to the minute hand pipe 13.

Further, a second hand pipe 15 is press-fitted into the second hand shaft 14 described above.

The extension of the fall prevention cylinder 23 described above prevents the hour hand pipe 12 from falling, and the outer periphery sliding surface 23A of the fall prevention cylinder 23 prevents the hour drum 26 from falling. Sliding surface 2
6A can prevent the portion drum 33 from falling.

On the other hand, the free fitting part 25 of the lock nut 22 receives the weight of the hour drum 26, and the hour drum 26 receives the weight of the minute drum 26 at the top edge 27A of its inner cylindrical part 27.
The stepped portion 35 of the downwardly protruding cylindrical portion 34 at No. 3 receives its own weight so that no load is applied to the timepiece movement 10.

Reference numeral 41 denotes a tapered hole formed in the inner cylindrical portion 42 of the minute drum 33 through which the second hand pipe 15 passes. Reference numeral 43 indicates a decoration hung on the interior second hand 16, and reference numerals 44 and 44A indicate transparent cases, and the case 44 is integrated with the case 19. 45 is a back cover of a lighter 46 housed in the case 44A. 47 is a dial.

Incidentally, the diameter of the top diameter portion 48 of the tapered hole portion 41 of the inner cylindrical portion 42 is D, and the diameter is set so that the second hand pipe 15 does not come into contact with the guide shoulder portion 49 when inserted.

Reference numeral 50 denotes a lower diameter portion of the tapered hole portion 41, and the diameter thereof is d, and the relationship is D>d.

The diameter d ₁ of the second hand pipe 15 satisfies the relationship d>d ₁ to prevent the second hand pipe 15 from being caught in the gap between the second hand shaft 14 and the diameter d of the lower diameter portion 50 .

Therefore, when the second hand pipe 15 is press-fitted into the second hand shaft 14, it is guided simply by inserting it into the taper hole 41, and it hits the second hand shaft 14 in the direction in which it is press-fitted, so that it can be easily press-fitted. Note that the second hand shaft 14 is lengthened to the machining limit, and it is difficult to make it longer than this due to accuracy, quality, cost, etc.

Next, the assembly order and operation of the present invention having the above configuration will be explained.

An hour hand pipe 12, a minute hand pipe 13, and a center threaded portion 11 integrally formed with the clock movement 10.
The base 17 and the case 19 are clamped and fixed by the center screw portion 11 and the lock nut 22. Next, the hour drum 26 is loosely fitted into the anti-falling cylindrical portion 23 of the lock nut 22, and the washer 32 and phase pinion 38 are sequentially installed in their respective predetermined positions.

Thereafter, the downwardly protruding cylindrical portion 34 of the minute drum 33 is loosely fitted into the inner cylindrical portion 27 of the hour drum 26. Next, after attaching the dial 47, the second hand pipe 15 having the second hand 16 is passed through the taper hole 41 and press-fitted into the second hand shaft 14, and finally the case 44A is fitted into the case 44. .

Therefore, due to the operation of the clock movement 10,
The second hand 16, minute drum 33, and hour drum 26 rotate normally and display the time.

When performing phase correction, lift the minute drum 33 and insert the inner teeth 40 and the fitting teeth 39 of the phase pinion 38.
The minute drum 33 is rotated appropriately, and then the minute drum 33 is fitted onto the minute hand pipe 13 via the phase pinion 38 again. As mentioned above, in the present invention, the minute hand pipe is provided with a phase pinion having a fitting tooth portion, and the minute drum is provided with an inner tooth portion, so that the phase can be easily corrected.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the prior art, Fig. 2 is an enlarged longitudinal sectional side view of the entire invention, Fig. 3 is an exploded perspective view showing the relationship between the hour drum and the hour hand pipe, and Fig. 4 is a downwardly protruding cylindrical portion. FIG. 5 is an exploded perspective view showing the relationship between the minute drum and the minute hand pipe. 10...Clock movement, 12...Hour hand pipe, 13...Minute hand pipe, 14...Second hand shaft, 15
... Second hand pipe, 33 ... Minute drum, 38 ... Phase pinion, 39 ... Fitting tooth portion, 40 ... Inner tooth portion.

Claims (1)

[Scope of utility model registration request] A phase pinion 38 having a fitting tooth portion 39 is attached to the minute hand pipe 13, while an inner tooth portion 40 is provided on the downwardly projecting cylindrical portion 34 of the minute drum 33, and the engagement between the fitting tooth portion 39 and the inner tooth portion 40 is provided. A phase correction mechanism in a drum drive device such as a watch that corrects the phase depending on the alignment position.