JPH0710311Y2 - Disc-fixed structure for disc-display watches - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a display disk fixing structure of a disk display type timepiece for displaying time and other purposes by using a display disk.

[Conventional technology]

In recent years, market needs for thinner watches have been increasing due to diversified designs and portability. However, since a general pointer-display type analog watch uses a pointer made by punching out a thin metal plate to display the time, there is a limit to how thin the needle can be processed, and the pointers contact each other. If the pointer comes into contact with the windshield or dial, the rigidity of the pointer will increase the load on the watch and cause the watch to stop. Therefore, it is necessary to secure an appropriate needle interval to prevent stopping, and it is very difficult to reduce the thickness from the dial to the windshield.

Therefore, instead of using a pointer, use an ultra-thin sheet plastic disc, etc. to reduce the load on the watch even if the display discs are allowed to touch each other or the display discs and dials or the windshield are allowed to touch. , There is a tendency that the number of disc type timepieces that reduce the thickness from the dial to the windshield increases.

Generally, the fifth method is to fix the display disc to the watch movement.
The structure is as shown in the figure. FIG. 5 (A) is a sectional view of the disc seat, and FIG. 5 (B) is a bottom view of the disc seat. The display disc 21 formed of an ultra-thin sheet of plastic material has a deformed hole 21a in the center, and the deformed hole 21a is aligned with the disc engaging portion 22a of the disc seat 22 formed of a plastic material or the like. Have been fitted. Further, the disk seat 22 into which the display disk 21 is fitted is fixed to the drive shaft 23 of the timepiece movement (not shown) by the push fitting of the shaft fitting portion 22e. A projection 22b having a diameter larger than that of the disc engaging portion 22a is provided in an arc portion of the disc engaging portion 22a of the disc seat 22, and when the display disc 21 is fitted into the disc seat 22, The deformed hole 21a of the disc 21 is elastically deformed to exceed the protrusion 22b of the disc engaging portion 22a of the disc seat 22, and the brim portion
It is pushed to the position where it abuts 22c.

Therefore, the protrusion 22b serves to prevent the display disc 21 from coming off, and the straight portion of the irregular hole 21a has the display disc 2
It is a rotation stopper for the disc seat 22 of 1. In this state, the display disc 21 is dimensioned so that it is loosely fitted to the disc seat 22, so the inclination in the vertical direction is free to some extent, and therefore the display disc is incorporated into the clock and is rotating. Even when the upper and lower members sometimes come into contact with each other, only the frictional resistance due to their own weight is added, so that the load that stops the timepiece is not applied.

[Problems to be solved by the invention]

However, in the above structure, when the disc seat 22 in which the display disc 21 is fitted is fixed to the drive shaft 23 of the timepiece movement by the push fitting of the shaft fitting portion 22e, the disc seat 22 is pushed, It causes harassment.

Then, the walls of the linear portion and the circular arc portion of the disc engaging portion 22a of the disc seat 22 both bulge outward so that they abut against the deformed hole 21a of the display disc 21 and press the deformed hole 21a of the display disc 21. Unfold and deform the display disc 21. At this time, the disc engaging portion 22a
Since the straight line portion has a smaller wall thickness, the amount of entrapment naturally increases, and the influence on the deformation of the display disc 21 is large.

Therefore, even if the display disc 21 is flat as a single component, it deforms when it is incorporated in the timepiece movement, and the sheet-shaped disc is largely warped or corrugated, and is pressed against the upper and lower members to rotate. It has the drawbacks that the current consumption of the timepiece is increased by abruptly increasing the resistance, and in the worst case, the time is delayed and the timepiece develops into a deadly defect as a timepiece.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a disc fixing structure in which the display disc is less likely to be deformed even if the disc seat bulges when the display disc is incorporated.

[Means for solving problems]

In order to achieve the above object, the present invention provides a substantially semicircular disc near both ends of the linear portion of the disc engaging portion of the disc seat which is composed of an arc portion and a linear portion where the display disc engages through the irregular hole. It is characterized in that an engaging protrusion is provided.

[Action]

With the above configuration, even if the disc seat, which is fitted and fixed to the drive shaft of the timepiece movement, is deformed and bulges, the deformed hole of the display disc is formed in the straight part of the disc engaging part. The gap between the display disc and the disc engagement protrusion of the disc seat does not coincide with the direction of deformation of the disc seat due to the deviation of the disc seat. It is intended to prevent deformation of the plate.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
1 to 2 show an embodiment of the present invention.
The drawing is a cross-sectional view and a bottom view of the disc seat, FIG. 3 is a plan view of the display disc, and FIG. 4 is a partially enlarged view of a portion F in FIG. In FIGS. 1 to 4, reference numeral 1 is a circular display disc for displaying the time, and the pointer portion 1b is printed on a transparent disc sheet made of polyester, which is a plastic material and has a thickness of about 30 to 50 μ. Is formed by means, and in the center, a deformed hole consisting of a straight part 1c and a circular arc part 1d with both ends of a circle cut
1a is provided. Reference numeral 2 denotes a disc seat formed of a plastic material, and the disc seat 2 has a circular brim portion 2f having a maximum diameter, a disc engaging portion 2a for engaging the display disc 1, and a timepiece movement ( A circular through-hole-shaped shaft fitting portion 2e provided in the central portion that is press-fitted to the drive shaft 3 (not shown) is provided. The disc engaging portion 2a is formed by cutting both ends of a circle, is composed of a straight line portion 2b and a circular arc portion 2c, and has four semicircular circles in the vicinity of both ends where the straight line portion 2b intersects the circular arc portion 2c. It has a plate engaging protrusion 2d.

Further, the convex portion 2d of the disc engaging protrusion 2d has a slope 2h having a slope-like slope in a direction opposite to the flange 2f, and a convex portion 2g having the same shape as the disc engaging protrusion 2d and having a large diameter is a circle. It is provided on the plate engaging protrusion 2d.

At this time, the deformed hole 1a of the display disc 1 and the disc engaging portion 2d of the disc seat 2 have substantially the same shape, and the dimension of the deformed hole 1a is slightly larger than that of the disc engaging portion 2a. Is made. That is, the width A of the straight portion 1c of the deformed hole 1a is set to be larger than the width B between the disc engaging protrusions 2d of the disc engaging portion 2a and smaller than the width E between the protrusions 2g. Has been done. Furthermore, the diameter of the arc portion 1d of the odd-shaped hole 1a
D ₁ is larger than the diameter D ₂ of the circular arc portion 2c of the disc engaging protrusion 2d.

In the above structure, in order to assemble the display disc 1 into the disc seat 2, first, the deformed hole 1a of the display disc 1 and the disc engaging portion 2a of the disc seat 2 are assembled.
When the display disc 1 is pushed in with the projections 2g aligned with each other, the dimensional relationship between the deformed hole 1a and the disc engaging portion 2a is as described above, and the display disc 1 is a thin polyester sheet as described above. Since the deformed hole 1a is elastically deformed, it is pushed along the slope 2h of the protrusion 2g to get over the protrusion 2g and come into contact with the flange 2f of the disc seat 2. Thus, the deformed hole 1a engages with the disc engaging portion 2a, and the state shown by the phantom line in FIG. 1 is obtained.

In this state, the display disc 1 and the disc seat 2 have a dimensional relationship between the deformed hole 1a and the disc engaging portion 2a as described above, and therefore the display disc 1 is in a loose state and receives no force. Therefore, no deformation occurs. Further, the display disc 1 is a straight portion 1c of the irregular hole 1a.
Is regulated by the convex portion 2g of the disc seat 2. That is, the width A of the straight portion 1c of the deformed hole 1a is equal to that of the convex portion 2g of the disc engaging convex portion 2d.
Since it is smaller than the width E, it does not fall out,
The display disc 1 and the disc seat 2 are integrated. When the display disc 1 is to be rotated with respect to the disc seat 2, if the straight portion 1c of the deformed hole 1a is slightly rotated, the disc engaging projection 2d of the disc seat 2 is placed on either side. It comes into contact and cannot rotate. That is, the rotation of the display disc 1 is also restricted by the disc engagement protrusion 2d.

Next, a case will be described in which the disc seat 2 into which the display disc 1 is fitted is press-fitted and fixed to the drive shaft 3 of the timepiece movement (not shown).

When the disc seat 2 is pushed into the drive shaft 3 by the shaft fitting portion 2e, since the push-fitting is performed as described above, the diameter of the shaft fitting portion 2e is enlarged by the drive shaft 3 and 2 will be deformed.

However, since the portion where the wall thickness becomes small naturally becomes large in the deformation, the shaft fitting portion 2e of the disc seat 2 and the straight portion 2b of the disc engaging portion 2a.
The part where the wall thickness is small, that is, on the X axis, is most likely to be affected.

However, as shown in FIG. 2, the gap between the straight portion 2b and the deformed hole 1a of the display disc 1 is large because the disc engaging protrusion 2d is provided in the disc engaging portion 2a. The straight portion 2b of the disc seat 2 does not come into contact with the deformed hole 1a of the display disc 1.

Further, although the deformation is small, it occurs in the entire circumferential direction of the shaft fitting portion 2e of the disc seat 2, so that the display disc 1 and the disc engaging protrusion 2d are formed.
4 will be described with reference to FIG. 4, the deformation direction of the disc seat 2 due to being pushed into the drive shaft 3 is the radial direction, and therefore occurs in the β direction.

However, the engaging direction of the deformed hole 1a of the display disc 1 and the disc engaging protrusion 2d of the disc seat 2 is the γ direction as described above. Since there is an angle α between the β direction and the γ direction, the displacement in the γ direction is the amount of displacement in the β direction multiplied by cosα, and the disc engagement protrusion 2d is as shown by the imaginary line. Moreover, since the small displacement is further reduced, the disc engagement protrusion 2d of the disc seat 2 and the deformed hole 1a of the display disc 1 do not come into contact with each other.

Furthermore, even if a sufficient clearance is provided between the circular arc portion 2c of the disc engaging portion 2a and the circular arc portion 1d of the irregular shaped hole 1a of the display disc 1, there is no functional problem. There is no contact with the raised portion 1a. In this way, even if the disc seat 2 to which the display disc 1 is attached is pushed into the drive shaft 3, no portion of the disc engaging portion 1a will come into contact with the deformed hole 1a of the display disc 1. The display disc 1 will not be deformed under the influence of the deformation of the disc seat 2.

[Effect of device]

As described above, according to the present invention, a substantially semi-circular disc is provided near both ends of the linear portion of the disc engaging portion of the disc seat which is formed by the circular arc portion and the linear portion where the display disc is engaged by the deformed hole. By providing the engagement protrusion, there is no problem in assembling, holding and fixing the display disc to the disc seat, and when the disc seat is pressed into the drive shaft when it is assembled into the watch movement. The deformation of the disc engaging portion due to the increase in the diameter of the shaft fitting portion does not affect the display disc and deform the display disc.

Therefore, the appearance defect due to the deformation of the display disc increases, further, the consumption current increases due to the large contact resistance when the display disc comes into contact with other members, and the time lag and stoppage which are fatal defects as a clock occur. It has the effect of not having.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view of a disc seat, FIG. 2 is a bottom view of the disc seat, and FIG.
FIG. 5 is a plan view of the display disk, FIG. 4 is a partially enlarged view of part F in FIG. 2, FIG. 5 shows a conventional disk seat, and FIG.
Is a cross-sectional view, and FIG. 5B is a bottom view. 1, 21 ... Display disc, 1a ... Deformed hole, 1c, 2b ... Straight part, 1d, 2c ... Arc part, 22, 22 ... Disc seat, 2a, 22a ...
… Disc engaging part, 2d …… Disc engaging protrusion, 2e, 22e …… Shaft fitting part, 2g …… Convex part, 3, 23 …… Drive shaft.

Claims (1)

[Scope of utility model registration request] 1. A display disc for displaying time such as hour, minute and second or other purpose and a disc seat for fixing the display disc to a drive shaft of a timepiece movement, wherein the display disc is In a disc display type timepiece configured to be attached to a timepiece movement through the disc seat to display time and other information,
The display disc has a deformed hole composed of an arc portion and a straight portion for engaging with the disc seat, and the disc seat has a shaft fitting portion which fits into a drive shaft of a timepiece movement, A circular disc engaging portion including a circular arc portion having a diameter smaller than that of the deformed hole of the display circular disc and a linear portion, and further in the vicinity of the intersection of the circular arc portion and the linear portion of the circular disc engaging portion and on the linear portion. At the position of the disc, by providing a disc engaging protrusion that is smaller than the width between the straight line portions forming the irregular hole of the display disc and is loosely engaged with the irregular hole of the display disc, A disc fixing structure for a disc display type timepiece, characterized in that an engagement protrusion serves as both a rotation stopper and a disengagement prevention of the display disc.