JPH0114949Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improving the calendar structure of a thin watch, and provides a calendar watch with a simple structure and improved ease of assembly and reliability.

FIG. 1 is a sectional view showing a conventional embodiment.
2 indicates a main plate, 2 indicates a date jumper which serves as a guide and rotating shaft for the date dial 4, and 3 indicates a date dial holder. The presser foot 3 is
A protrusion 3a is formed, and is guided and positioned by a date dial presser protrusion guide hole 2a provided in the date jumper 2. The date jumper 2 is positioned in a plane by a guide pin 6 set on the main plate 1, and the date jumper 2 is positioned by a date dial presser screw 10 via a date dial presser 3.
It is fixed to the base plate 1 by. The guide pin hole 3b of the hour wheel holder 3 is fitted with the guide pin 6 with some play. 5 indicates the day board, and the day star wheel 7
Attach it to configure the day wheel. The day star wheel 7 is guided by a day wheel guide bush 8 attached to the date jumper 2, and is configured to be positioned cross-sectionally by a day wheel stopper seat 9.

In the structure shown in FIG. 1, in order to make the calendar structure thinner, the date jumper 2, the date wheel presser 3,
It is necessary to reduce the thickness of the plate members that make up the calendar mechanism such as the calendar mechanism, and to reduce the gap between the date dial holder 3 and the day plate 5 as much as possible. The gap between the wheel presser foot 3 and the day plate 5 is also becoming smaller as much as possible. For this reason, the height of the guide pin 6 erected on the main plate is limited by the day plate 5, and because the plate member is thin, it is difficult to obtain the guide length of the date dial holder 3. First, as shown in FIG. 1, a protrusion 3a was provided on the date dial holder, and this had to be positioned and guided by a guide hole 2a made in the date jumper. However, in this structure, the height of the protruding portion (H in the figure) becomes high when considering variations and warpage of the parts, or guideability during assembly, and the base plate requires a backrest 1a. Also, the protrusion 3a
is used for positioning the presser foot, so at least 2
This will require more books and the size of the base plate will also increase. Furthermore, since the protrusion 3a of the date wheel holder serves as a reference, precision in position and shape is required, which is a factor in increasing costs. Furthermore, since the date dial holding projection is obtained by drawing, the higher the height (H) of the projection, the wider and larger the drawing range becomes, and the position is also limited in terms of planar space. Alternatively, since relief must be provided on the base plate, the location is further limited and it cannot be set in a location with good conditions. In addition, the positioning standards for the date jumper are determined by the guide pins on the main plate, and the positioning standards for the date wheel presser are determined by the guide holes and protrusions of the date jumper, which leads to problems such as a lack of reliability and increased variation. Furthermore, in terms of assembly, it is difficult to assemble due to different standards, and because the guide of the date wheel holder is not sufficient, during mechanical assembly, the date wheel holder may come off after it is installed and before the screw tightening process begins. The problem was that the screws had to be tightened while holding down the wheel holder, which increased assembly costs and was not suitable for mass production.

The present invention eliminates such drawbacks and will be described in detail below with reference to the drawings.

Figure 2 is a plan view showing an embodiment of the present invention, Figure 3-
Figures a and b are cross-sectional views showing an embodiment of the present invention.
In Figures 3-a and 3-b, Figure 3-a is a cross-sectional view taken along line A-A' in Figure 2 in the direction of the arrow, and Figure 3-b is a cross-sectional view taken along line B-B' in Figure 2. , shows a cross section taken along line C-C'.

In FIGS. 2 and 3, reference numeral 11 indicates a calendar back plate, and a date wheel 12 that engages with a time display wheel train (not shown as it is well known) drives the date wheel 4.
The date jumper 2 is configured to be thicker than the toothed portion 12a of the date jumper 2, which serves as the positioning and rotation axis of the date dial 4.
This prevents the cross-sectional gap of the date wheel 12 from becoming clogged. Further, the calendar back plate 11 is a correction wheel for correcting the position of the date wheel and day star wheel 7, and the rotating shaft 11 of the second calendar correction transmission wheel 13 is rotated by operation of an external operation member (not shown as it is well known).
a, Deformed hole 11c for swinging of the calendar correction wheel 14, which engages with the day correction transmission wheel 15 and the date wheel 4 by engaging and swinging with the second calendar correction transmission wheel 13;
A day correction transmission axle 16, which serves as a fixed and rotating shaft for the day correction transmission wheel 15 that meshes with the day star wheel 7, is attached, and a tooth adjustment 11b of the date wheel 4 is provided. As a result, conventionally, the swing deformation hole 11c of the calendar correction wheel 14, the day correction transmission axle 1
6. The mounting plate for the date adjustment transmission wheel 15, the date wheel tooth plate 11b, or the cross-sectional position alignment of the date wheel 12 is made on the main plate, and is the most expensive component of the movement. This was a factor that increased the processing load on a certain base plate and made it even more expensive, but it was replaced with a calender back plate that is thin and easy to process, thereby reducing the processing load on the base plate and reducing costs.

In addition, on the calendar back plate 11, a protrusion 3 is provided on the date wheel holder 3 to improve guiding performance during assembly.
It has escape hole 11d of a. Reference numeral 5 indicates a day plate (indicated by a dashed dotted line in the plan view of FIG. 2), which is attached to the day star wheel 7 to constitute the day wheel. The day star wheel 7 is guided by a day wheel guide bush 8 attached to the date jumper 2, and is fixed to the day wheel guide bush 8 by a day wheel stopper seat 9. The date wheel presser 3 is the calendar correction wheel 1
In order to always apply force in the cross-sectional direction of the calendar correction wheel 14 in order to swing the calendar correction wheel 14, the calendar correction wheel pressing spring 3b has an initial deflection and presses down the calendar correction wheel. Pin A17
means a guide hole 3c drilled so as to be guided with minimal backlash, and a guide pin B1 planted in the base plate 1.
An elongated guide hole 3i is provided such that the guide hole 8 is held between a rigid body part 3d and a spring-like elastic part 3e. The date dial presser 3 is positioned by determining one point by engaging the guide pin A17 and the guide hole 3c, and by applying the rigid body part 3d to the guide pin B18, the direction of rotation of the date dial presser 3 is determined. 3c and the rigid body part 3d perform positioning.
The elastic part 3e is set so that the gap between the rigid part 3d and the elastic part 3e is smaller than the pin diameter of the guide pin 18, and after the date dial presser 3 is assembled into the guide pin B18, the guide pin B18 is connected to the elastic part. 3e is pressed from the side with the spring force obtained by bending, and the guide pin B18 and the rigid body part 3d come into contact with each other, and the date dial presser 3
It is designed to prevent misalignment of the In addition, the elastic part 3e section uses the force obtained by bending the elastic part 3e by assembling the date wheel holder 3 into the guide pin B18, so that the date wheel holder 3, the date jumper 2, the calendar back plate 11, etc. , or the date wheel presser 3 is lifted by the guide pin A17 due to the initial deflection of the date wheel presser calendar correction wheel presser spring 3b.
It has the role of preventing it from coming off the guide pin B18.

As a result, unlike conventional structures, the spring force obtained by deflecting the elastic part 3e is used to prevent the date dial holder from coming off even if some vibration or impact is applied, so it can be used, for example, on an automatic assembly line. Even if the assembly is performed by , the date dial holder will not come off the guide pin and cause a process defect after the date dial holder is assembled to the guide pin and before the screw tightening process begins, making it easy to put on the automatic assembly line. This will also reduce costs. Hand-assembled products also have the advantage of being easy to assemble. Furthermore, since the guide pin B18 is inserted into the elastic portion 3e without play, variations are suppressed and reliability is improved.

Furthermore, the date dial presser 3 is provided with a protrusion 3a in order to improve the guiding performance during assembly as described above. Even if the amount of protrusion from the date jumper is reduced and the guide length of the date dial presser 3 is reduced, the protrusion 3a is guided by the protrusion guide hole 3c of the date jumper, making assembly easier. Further, the guide hole 2c of the date jumper 2 is set so as to be loose even if the positions of the guide pins A17 and B18 vary, and are not used as a positioning reference for the date jumper holder. Therefore, the position of the protrusion guide hole into which the protrusion of the date dial holder is inserted can be set at any location where there is space, and the shape and precision are rough, and the processing is easy and easy to manufacture.

Furthermore, the date wheel presser 3 is provided with a notch 3f near the guide pin B18, and in accordance with this shape, the date jumper 2 is also provided with a notch 2b facing opposite to the date wheel presser notch 3f. Since it is provided so as to intersect with the presser foot notch 3f, the date dial can be removed by pushing a watch screwdriver or the like into the gap at the intersection of the date jumper notch 2b and the date dial presser notch 3f and prying the date dial presser 3. The presser foot 3 can be removed from the guide pin B without applying any strain to the date dial presser foot 3.

The date jumper 2 and the calendar back plate 11 are positioned by two guide pins A17 and B18 set on the main plate, and are fixed to the main plate 1 by a date indicator presser screw 10 via a date indicator holder 3. It is configured so that As a result, the calendar back plate 11,
Since the date jumper 2 and the date wheel presser 3 are all positioned using the same reference (guide pin A17, guide pin B18), the reference can be changed by determining only the date wheel presser using the reference hole of the date jumper, as in the conventional structure. Since there are no errors, variations can be suppressed and reliability can be increased.

As described above, the present invention provides a back plate and a date jumper which are positioned by the guide pins provided on the main plate by engaging the elongated guide holes provided in the date wheel holder with the guide pins on the main plate. By stacking the date dial holders and locking them to the main plate, the number of thin plates such as the calendar back plate is increased compared to the conventional structure. Alternatively, if the calendar correction method is performed using a correction wheel, and the calendar correction wheel presser spring is formed on the date wheel holder, it is difficult to guide the circuit board that forms around the calendar. Guidance and fixation can be ensured without being restricted by the structure. Further, by carrying out the present invention, it is possible to easily obtain a calender structure with improved reliability and suppressed cost increase, and also with improved ease of assembly.

In the present invention, the explanation has been given on the case where the elastic part formed in the date dial holder is formed at one place, but the effect is the same even if it is formed at two or more places and the guide pins at two or more places are held between the elastic parts. . Furthermore, in the present invention, the shape of the elastic part is described as being spring-like, but as shown in FIG. The same effect can be obtained even if a thin wall portion 3h is provided between the outer shape and used as an elastic portion.

In addition, in this invention, we have explained a structure in which an elastic part is provided on the date dial holder and the guide pin is held between the elastic parts, but even if it is applied to the date dial holder, the dial washer, which is used to prevent needle runout, etc. This will prevent the jumper from floating. It also has great effects, such as being able to prevent floating due to sledding of Japanese jumpers. Furthermore, the present invention can be applied not only to calendar structures but also to holding members, receiving members, conductive members, etc. used in electronic circuits, time display train wheels, switching mechanisms, etc., and the same effects as above can be obtained. I can do it.

[Brief explanation of the drawing]

Fig. 1...A sectional view showing one conventional embodiment, Fig. 2...A plan view showing one embodiment of the present invention, Fig. 3-a,
Fig. 3-b: A sectional view showing one embodiment of the present invention; Fig. 4: A plan view showing another embodiment of the present invention. 1...Main plate, 2...Date jumper, 3...Date wheel holder, 3a...Protrusion formed on date wheel holder, 3e
...Spring-like elastic part formed on the date dial holder, 4...
Date wheel, 5...day plate, 7...day star wheel, 8...day wheel guide bushing, 9...day wheel stopper, 10...date wheel holding screw, 11...calendar back plate, 12...day Feeding wheel, 13...Second calendar correction conveying wheel, 14...
...Calendar correction car, 15...Day correction notification car, 16
...Day correction transmission axle, 17...Guide pin A, 18
...Guide pin B.

Claims (1)

[Scope of utility model registration request] a main plate having a plurality of guide pins and to which a date indicator, a day indicator, a date/day indicator, and a date/day corrector are attached;
a back plate that positions the cross-sectional direction of the date dial, engages with the plurality of guide pins, and is positioned and held on the main plate; and an elastic part that positions the date dial and engages with the plurality of guide pins of the main plate. a date jumper placed on the back plate; an elastic part that positions the day wheel; a rigid part and an elastic part that are disposed near the elastic part and sandwich one of the plurality of guide pins of the main plate; a date wheel holder having an elongated guide hole formed with a hole and placed on the date jumper; and means for fixing the date wheel holder to the main plate together with the back plate and the date jumper. The date wheel holder is characterized in that the elongated guide hole is elastically engaged with one of the guide pins of the main plate with an interference, and is guided and fixed to the main plate together with the back plate and the date jumper. The calendar mechanism of the clock.