JP2000162327A - Switching mechanism of clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a date indicator from being damaged or the like due to excessive pressing by providing a circumferential notch for attaching a travel limiting member to a setting lever shaft and inserting a pressing member like a C-ring into the notch for holding. SOLUTION: When a setting lever shaft 3 is to be driven by a winding stem 4 which is an externally operated member in a switching mechanism of a clock, since the winding stem 4 is pulled out of a base plate 5, it presses an end face 300b of the setting lever shaft 300, while excessive pressing might cause a date indicator 1 or the like to be damaged. Thus a notch 300c in a circumferential direction for attaching a travel limiting member is provided on a rear lid side of the shaft 300, and a pressing member 10 like a C-ring is pressed into the notch 300c for holding, thereby limiting a travel of the shaft 300. Thus the end face 300b may not be excessively pressed, thereby preventing the date indicator 1 or the like from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching mechanism for a timepiece, and more particularly, to a shape of a setting shaft and a structure around the setting shaft for preventing damage to a date dial, a dial and the like.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional timepiece switching mechanism. The weighing axis (100) shown here is
The structure is such that the collar portion (100a) is attached to the back cover side with respect to the main plate (5) of the pushing shaft (100).
In this structure, the assembling shaft (100) is inserted into the guide hole (5a) of the main plate (5) from the back side of the main plate (5) and assembled.

[0005] FIG. 5 is a diagram showing another example of the structure of the ramming shaft (200).
FIG. 6 is a cross-sectional view of a timepiece switching mechanism using a watch. This weighing shaft (200) has a flange (200a) with a main plate (5).
This is the structure on the dial side. In this structure, the assembling shaft (200) is inserted into the guide hole (5a) of the main plate (5) from the dial side of the main plate (5) and assembled.

[0004]

In the structure shown in FIG.
When assembling and disassembling the shim (3) arranged on the dial side of the timepiece, the work is performed with the back side of the main plate (5) facing down, so that the shim (100) is connected to the back side. In addition, there is a problem in that it falls out from the guide hole (5a) of the main plate. In order to prevent this, a special jig for temporarily supporting the pushing shaft (100) is required.

In the structure shown in FIG. 5, in order to pull out the winding stem (4) from the main plate (5) to the outside, the end face (200b) of the pushing shaft (200) is pressed from the back cover side (2). It is necessary to release the engaging part (3a) of the shim (3) with the winding stem (4) by pushing it in against the elastic pressing force of There was a problem of pushing down like a chain line.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and does not require a special jig or the like, and has a shape of a weighing shaft and a structure around the weighing shaft which facilitates assembly and disassembly. The purpose is to provide.

[0007]

First of all, the mounting position of the flange portion of the mounting shaft is set between the base plate and the mounting plate. A structure was provided on the rear pivot side of the rear pivot side to insert and hold the determining member in the notch, and the movement of the rear end axis was controlled on the rear rear side.

In addition, by adopting a structure in which a receiving member is provided on the dial side of the main plate, the movement of the setting shaft is managed on the dial side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. (Embodiment 1) In the structure of FIG.
A notch (300c) in the circumferential direction for mounting the determining member is provided on the back cover side of (0), and a C-ring-shaped pressing member (10) is inserted and clamped in the notch.

[0010] The plan shape of the C-ring-shaped holding member (10) is shown in the upper part of FIG. (Embodiment 2) In the structure of FIG. 2, a pressing lever member (2) in which one end of a lever has a C-ring shape (20a) is used as a determining member instead of the pressing member (10) in the structure of FIG.
0) was used. The other end of the lever is fixed to a lever fixing base (8) or the like by a screw (7).

The plan shape of the lever member (20) is shown in the upper part of FIG. (Embodiment 3) In the structure of FIG.
A receiving member (30) is provided on the dial side of the main plate (5).
This receiving member may be used as a conventional part such as a backing holder, a date wheel holder, or the like, or may be newly provided as a bearing member. The receiving member (30) is fixed on the surface of the main plate (5) on the dial side by, for example, screwing with a screw (6).

[0012]

The present invention is embodied in the form described above, and has the following effects. A notch in the circumferential direction for attaching the determining member is provided on the back cover side of the weighing shaft, and a C-ring-shaped pressing member for determining the degree is inserted and clamped in the notch to adjust the degree of the weighing shaft. Make a decision. Thereby, when pushing the upper end surface of the weighing shaft to pull out the winding stem to pull out the winding stem, the weighing shaft is not pushed too much, and damage to the date wheel and the like can be prevented.

Further, a notch in the circumferential direction for mounting the determining member is provided on the back cover side of the weighing shaft, and an elastic pressing lever member for determining the degree is inserted and clamped in the notch. The shape sandwiched by the notch of this holding lever member is C
It has a ring shape, and the other end is structured to be fixed to a fixing base or the like with screws. Thereby, when pushing the upper end surface of the weighing shaft to pull out the winding stem to pull out the winding stem, the weighing shaft is not pushed too much, and damage to the date wheel and the like can be prevented. In addition,
When the pushing shaft is stopped, the elasticity of the lever automatically returns the pushing shaft to its original position.

Further, by adopting a structure in which the receiving member is provided on the dial side of the main plate, the amount of pushing of the weighing shaft can be limited by the receiving member, and damage to the date wheel and the like can be prevented. In addition, in the structure of the present invention, assembling and disassembling can be performed on the dial side of the timepiece, so that the operation is simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a switching mechanism of a timepiece including a weighing shaft according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of a switching mechanism of a timepiece including a weighing shaft according to Embodiment 2 of the present invention.

FIG. 3 is a sectional view of a switching mechanism of a timepiece including a weighing shaft according to Embodiment 3 of the present invention.

FIG. 4 is a cross-sectional view of a conventional switching mechanism of a timepiece including a weighing shaft.

FIG. 5 is a cross-sectional view of a conventional switching mechanism of a timepiece including a weighing shaft.

[Explanation of symbols]

 1 day indicator 2 weight holding 3 weight 4 winding stem 5 main plate 6 holding member holding screw 7 lever holding screw 8 lever fixing base 10 holding member 20 holding lever member 30 receiving member 100, 200, 300

Claims (4)

[Claims] In a timepiece switching mechanism typified by a shim (3) operated by a winding stem (4) as an external operating member of the timepiece, the winding stem (4) is pulled out from the main plate (5) to the outside. End surface (300b) of torsion shaft (300)
As a means for preventing the date wheel (1) or the like from being damaged by pushing too much, a notch (300c) in the circumferential direction for mounting the determining member is provided on the weighing shaft (300),
A switching mechanism for a timepiece, characterized in that a C-ring-shaped holding member (10) is inserted and held in the notch. 2. In a switching mechanism of a timepiece represented by a shim (3) operated by a winding stem (4) as an external operation member of the timepiece, the winding stem (4) is pulled out from the main plate (5) to the outside. End surface (300b) of torsion shaft (300)
As a means for preventing the date wheel (1) or the like from being damaged by pushing too much, a notch (300c) in the circumferential direction for mounting the determining member is provided on the weighing shaft (300),
A switching mechanism for a timepiece, wherein an elastic holding lever member (20) is inserted and clamped in the notch. 3. The pressing lever member (20) has a C-ring shape (20a) inserted and clamped in a notch portion (300c) of a weighing shaft (300), and the other end is formed on a lever fixing base (8) or the like. 3. The timepiece switching mechanism according to claim 2, wherein said timepiece switching mechanism has a structure fixed by a lever holding screw (7). 4. In a switching mechanism of a timepiece represented by a shim (3) operated by a winding stem (4) which is an external operation member of the timepiece, the winding stem (4) is pulled out from the main plate (5) to the outside. End surface (200b) of torsion shaft (200)
As a means for preventing the date wheel (1) or the like from being damaged by pushing too much, the pushing shaft (200) and the date wheel (1)
And a receiving member (30) for determining the movement of the pushing shaft (200).