JP2594207Y2 - Watch back structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watch backing structure.

[0002]

2. Description of the Related Art A back-around structure of a timepiece is composed of a plurality of parts such as a makishin, a mandarin duck, a persimmon, a back pusher, and a knuckle wheel. Each of the components has a complicated shape, and many of them have a spring property. Therefore, disengagement and the like during the assembly are likely to occur, which is a difficult part of the assembly work. For this reason, conventionally, as shown in FIG. 4, a structure has often been used in which, after assembling the back-around portion and before assembling other portions, it is independently fixed with a set screw or the like.

FIG. 4 is a plan view of a main part of a conventional watch, showing a back-around structure, wherein 21 is a main plate, 22 is a mandarin duck, 23 is a kanuki, 24 is a back pusher, 25 is a Tsuzumi wheel, 26 is a winding stem,
27 is a set screw. First, assembling the timepiece shown in FIG.
2. The back presser 24 is sequentially incorporated, and then the back presser 24
Is hooked on the protruding portion 22a of the mandarin duck 22 so as to have a neck pulling moderation. Then set screw 27
Is fixed to the base plate 21 to fix the back presser 24, thereby completing the assembly of the back circumference portion. Finally, the winding stem 26 is inserted. In this way, it is possible to prevent the back circumference portion from becoming disengaged when assembling another portion such as a wheel train portion or a circuit portion to be subsequently assembled.

Further, recently, in order to realize a low-cost timepiece, a structure in which the number of components is reduced as much as possible has been considered. There has been an increasing number of systems in which the components are assembled one after another, and when all the assemblies have been completed, the entire assembly is pressed together with a pressing plate or the like and finally fixed with set screws.

[0005]

[Problems to be Solved by the Invention] However, in the method in which only the back portion is screwed as a block as described above, the number of screws increases and the number of assembly steps for screw tightening also increases. Therefore, the cost increases. Also, if the rear set screw is abolished to reduce the number of parts and the components of the timepiece are collectively fixed at the end, the rear parts become easily disengaged during assembly. .

[0006] In a general timepiece structure, the back-around portion is often assembled at an early stage of the assembling procedure, so as to prevent disengagement due to an impact or the like when assembling other portions performed after the back-around assembly. Care must be taken. Especially when trying to assemble with an automated line,
When moving to the assembly station for each part, it is conceivable to receive an impact or to vibrate positively to ensure the engagement of the train wheel and other parts, so that the impact and vibration may cause disengagement behind the back This is likely to occur, and as a result, the operating rate of the line may be reduced.

An object of the present invention is to solve the above-mentioned problem and realize a backing structure with good assembling workability at a low cost by a simple structure.

[0008]

In order to achieve the above object, the present invention has the following arrangement. That is, the winding stem, a setting lever, an actuating part such as yoke, in the back about the structure of the configured clock from the holding member or the like for holding the pre-Symbol actuating piece is molded by a plastic material, the inner setting lever of Ya previous SL working components Engage with other members such as kanuki
An engaging plate member that engages with the holding plate member in the vicinity of the engaging plate member.
Hook type that bends when mounted on holding member and returns after mounting
Forming a temporary fixing portion, and the engaging plate member and the
A link between the engaging plate member and the other member is provided between the temporary fixing portion and the temporary fixing portion.
It is characterized in that a gap smaller than the total amount is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a main part showing a timepiece structure according to an embodiment of the present invention, and FIG. 2 is a partial sectional view thereof. Reference numeral 1 denotes a base plate on which a mandrel pin 11, a kanuki pin 12, a screw tube 13 and the like are press-fitted and fixed. Numeral 2 is a winding spacer for holding a backing part and other parts, which is made of plastic material, and has a hook part 2a for preventing detachment during the assembly of the screwdriver 5. 10 is a rotor, 2
8 is the fifth wheel, 29 is the fourth wheel, 30 is the third wheel, 14 is the second wheel, 18 is the minute wheel, and is a wheel train that sequentially transmits the rotation of the rotor 10 and displays the time. is there. Reference numeral 19 denotes a train wheel bridge which holds the wheel train together with the main plate 1. 3
Is a makishin, and 4 is a mandarin duck. The mandrel 4 is engaged with a small-diameter step portion of the winding stem 3. Numeral 5 is a canker, the moderation portion 5a engages with the mandrel 4, and the return spring portion 5b is hooked on the mandrel pin 11. In addition, the knuckle 5 has a contact portion 5c with the circuit board 6 and a brake portion 5 of the rotor 10.
It has functional parts such as d. 15 is Tsuzumi car,
Numeral 16 denotes a small iron wheel, and numeral 17 denotes a midway wheel. Reference numeral 6 denotes a circuit board, 7 denotes a circuit support for holding the circuit board 6 and the canker 5 and the like from above, and 8 denotes a pressing plate for holding the circuit support 7 and other components from the top of the timepiece move.
Winding spacer 2, circuit board 6, circuit support 7, pressing plate 8
Are stacked and fixed with set screws 9.

[0010] Oite the above configuration, in this embodiment
Of the backing parts, Makinshin 3, Mandarin Duck 4, and Kannuki 5 are made.
Moving parts, of which the mandarin duck 4 is the Makin 3 and also Cannes
The key 5 constitutes an engagement plate member that engages with the reed 4.
You. Further, the setting lever 4, preventing the stem 3, the winding stem spacer 2 for retaining the back around components such as the yoke 5, to form a hook portion 2a according to the upper surface of the yoke 5, the off each other viewed engage the yoke 5 in the course of assembly It is structured to perform temporary fixing.

The operation of the timepiece according to the embodiment will now be described. By pulling the head of the winding stem 3, the winding head 3
The mandrel 4 engaged with the step is rotated around the mandrel pin 11. As a result, the knuckle 5 is provided with a moderating portion 5a that meshes with the mandarin duck 4, rotates about the kanuki pin 12, and moves the pinion wheel 15 toward the small iron wheel 16 to mesh therewith. The contact portion 5c of the cannula 5 is connected to the circuit board 6
Slides on the lower surface to make contact with the reset pattern, a reset signal is input, and the output of the clock drive pulse is stopped. In addition, the brake unit 5d locks the wheel train by pressing the rotor 10 from the side surface, so that the time can be adjusted.
When the winding stem 3 is rotated in this state, the rotation is
5. The transmission is transmitted to the small iron wheel 16, the intermediate minute wheel 17, and the minute wheel 18, so that the time can be corrected. When the time adjustment is completed, the state at the time of pulling the neck is released by pushing the winding stem 3, and the operation of the timepiece is restarted.

Next, the operation of this embodiment will be described in the order of assembly. First, the winding stem spacer 2 is positioned on the base plate 1 with the screw tube 13 or the like and incorporated. Next, the mandrel 4 is assembled with the mandrel pin 11 in position, and the pinion wheel 15 is also dropped into the guide groove of the winding stem spacer 2.
Next, the cannus 5 are inserted into the groove of the tsuzumi wheel 15 and the mandarin duck 4
And assembled into the cannuki pin 12 from directly above. Thereafter, the return spring portion 5b of the kanuki 5 is bent to the outside of the move and hooked on the mandrel pin 11. Moderation part 5a by spring force of return spring part 5b
Slashes against the mandarin duck 4 and generates a moderating force when the winding stem 3 is pulled. The hook portion 2a of the winding stem spacer 2 elastically bends and escapes when the kanuki 5 is assembled, and returns to the original position after the kanuki 5 is assembled to temporarily fix the kanuki 5.

The state of the winding stem spacer hook portion 2a when assembling the canker 5 will be described in detail with reference to the sectional view of FIG. FIG. 3A shows a state before the kanuki 5 is incorporated, and FIG.
FIG. 3B shows a state during the assembling, and FIG. 3C shows a state after the assembling. As shown in FIG.
Is moved downward from the position of the upper surface of the winding stem spacer hook portion 2a so as to be placed on the flat plate portion of the winding stem spacer 2, the kanuki 5 hits the slope of the upper surface of the hook portion 2a.
When the kanuki 5 is continuously moved downward, FIG.
Hook portion 2a made of plastic material as shown in (b)
The slanted portion on the upper surface of the hook is pushed and elastically deforms outward under the force, and escapes from the kanuki 5. Then Kannuki 5
After passing through the hook portion 2a, the hook portion 2a returns to its original position as shown in FIG. At this time, Kannuki 5 and hook 2a
There is a slight gap 20 in the cross-sectional direction between them.

As described above, the knuckle 5 is actuated in the plane direction by the pulling operation of the winding stem 3, and moves in and out of the hook portion 2a. At this time, a certain amount of the gap 20 is required so that the canker 5 is not caught by the hook portion 2a and does not malfunction. In this embodiment, when the assembly is completed, the cannus 5 are covered from the upper surface by the circuit support base and the agaki is regulated. Therefore, if the amount of the gap 20 is set to be larger than the agaki amount, malfunction will not occur. Absent.

On the other hand, the provision of the hook 2a prevents the canker 5 from becoming disengaged from the ratchet wheel 15 and the mandarin duck 4 during assembly. The canker 5 has a spring force at the return spring portion 5 b, and the spring force is received by the moderation portion 5 a with the mandrel 4. In addition, since it also serves as a contact portion 5c with the circuit board 6 and a brake portion 5d of the rotor 10, the component shape is complicated and large. For this reason, there are many chances of disengagement during assembly. However, by providing the hook portion 2a on the winding stem spacer 2, even if the kanuki 5 is lifted up and disengaged due to various impacts after being assembled, the hook portion 2a is lifted up by the amount of the gap 20.
Since the lifting is regulated by a, there is no possibility of disengagement. Therefore, if the amount of the gap 20 is set to be smaller than the step amount of the engaging portion between the ratchet wheel 15 and the canker 5, the engagement amount of the moderating portion 5a of the mandarin duck 4 and the canker 5, etc.
Even if the cannus 5 float by the amount of the gap 20, the engagement does not occur, and the function of the temporary fixing can be achieved.

After the incorporation of Kannuki 5, the rotor 10,
The wheel trains of the fifth wheel 28, the fourth wheel 29, the third wheel 30, the second wheel 14, the minute wheel 18, the middle minute wheel 17, the small wheel train 16 and the like are sequentially incorporated, and then the wheel train The receiver 19 is incorporated to hold each wheel train. Then, the circuit board 6 and the circuit support 7
And other components of the watch are assembled, and finally, the pressing plate 8 is covered, and the set screw 9 and other screws are tightened to fix the watch. The lifting of the upper surface side of the canker 5 is regulated by the circuit support stand 7, the mandarin duck 4 is held down by the lower bent portion of the pressing plate 8, and the fixing of the back circumference is completed.
In other words, the backside fixing is temporarily performed by the hook portion 2a of the winding stem spacer 2 during the assembly, and the proper fixing is performed only by the last screw tightening after all the components of the timepiece have been assembled. Done.

In this embodiment, the winding stem spacer 2 is used.
Although the hook portion 2a is elastically deformed and escapes when the cannula 5 is incorporated, the hook portion 2a may have a thick rigid structure as a simpler structure. In this case, the hook part 2a is shifted from a predetermined direction when the kanuki 5 is incorporated.
After passing through the hook portion 2a, it may be slid to a predetermined direction in which it engages with the mandarin duck 4 or the like so as to be hooked on the hook portion 2a. However, when considering the assembling workability, especially when assembling in an automated line, it is advantageous that the assembling method is as simple as possible. Therefore, as in this embodiment, the hook portion 2 of the winding stem spacer 2 is used.
It is considered that it is better to be able to incorporate the cannus 5 from directly above while keeping the cannus 5 in a predetermined direction as a structure in which a is elastically deformed.

Further, in this embodiment, the hook portion 2a of the winding stem spacer 2 has a structure in which the hook portion 2a is hooked on the upper surface of the canker 5 for temporary fixing.
Although not used in the present embodiment, a structure for temporarily fixing other components such as a back presser is also effective similarly.

[0019]

[Effects of the Invention] As described above, according to the present invention, during the assembly of the timepiece, the occurrence of disengagement of the back-around portion made of a part having a spring property such as a knuckle or a back presser can be prevented. A timepiece with good assembling workability can be realized. Further, in the present invention, since a set screw for fixing only the back-around portion is not used, the number of parts can be reduced, and the cost can be reduced. As a result, in manual assembly, assembly can be performed easily and in a short time without the need for skilled assembly personnel. Since the backing portion does not come off due to the above-mentioned factors, the operation rate of the assembly line is improved, and as a result, the assembly cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a main part plan view showing a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing the first embodiment of the present invention.

FIGS. 3A and 3B are cross-sectional views showing a state of assembling the cannus used in the first embodiment of the present invention, wherein FIG. 3A shows a state before assembling, FIG. 3B shows a state during assembling, and FIG. .

FIG. 4 is a partial cross-sectional view showing fixing of a conventional back-around component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground plate 2 Makin spacer 3 Makin 4 Oshidori 5 Kannuki 6 Circuit board 7 Circuit indication board 8 Pushing plate 9 Set screw 15 Tsumi wheel

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyuki Uehara 6-11-12 Honcho, Tanashi-shi, Tokyo Citizen Watch Co., Ltd. Tanashi Factory (72) Masahiro Kasaya 6-1-1, Honcho, Tanashi-shi, Tokyo No. Citizen Watch Co., Ltd. Examiner at Tanashi Works Tokio Goto (56) References JP-U 2-99383 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G04B 1/00 -49/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A winding stem, a setting lever, an actuating part such as yoke, in the back about the structure of the configured clock from the holding member or the like for holding the pre-Symbol actuating piece is molded by a plastic material, prior Symbol working components Like a mandarin duck or kanuki
An engaging plate member for engaging with another member, wherein the engaging plate member
To the holding member near the
Forming a hook-shaped temporary fixing part that returns,
Between the engaging plate member and the temporary fixing portion,
A back-around structure for a timepiece, wherein a gap smaller than the amount of engagement with the other member is provided.