Motors: spring – weight – or animal powered – Spring – With winding means
Reexamination Certificate
2000-08-29
2002-07-23
Herrmann, Allan D. (Department: 3682)
Motors: spring, weight, or animal powered
Spring
With winding means
C029S893100, C074S143000, C074S432000, C368S148000, C403S383000
Reexamination Certificate
active
06422348
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transmission wheel, to a method for manufacturing the transmission wheel, and to a self-winding wheel train, and more particularly to a transmission wheel which can be manufactured by a simplified process, a method for manufacturing the transmission wheel and a self-winding wheel train having the transmission wheel.
2. Background Information
FIG. 6
is a schematic top view showing a self-winding train wheel structure.
FIG. 7
is a sectional view showing the self-winding train wheel structure shown in FIG.
6
. This self-winding train wheel
500
is structured by an intermediate first transmission wheel
503
to transmit rotation of an oscillating weight
501
to a first reduction wheel
502
which transmits rotation of the intermediate first transmission wheel
503
to a pawl lever
504
, the pawl lever
504
being supported at a shaft in an eccentric position of this first reduction wheel
502
and formed by a draw finger
5041
and a feed finger
5042
, a second reduction wheel & pinion
600
whose rotation is regulated in one direction by the pawl lever
504
to transmit rotation to a ratchet wheel
505
, the ratchet wheel
505
being in engagement with a barrel complete stem
5071
of a barrel complete
507
. The rotation of the ratchet wheel
505
is transmitted to the barrel complete
507
to store power on a spiral spring provided therein. The second reduction wheel & pinion
506
is rotatably supported at a shaft by a barrel complete bridge
551
and a second transmission bridge
552
. The second reduction wheel & pinion
600
is arranged at an underside of the ratchet wheel
505
. This is to reduce the thickness of the timepiece movement.
If the oscillating weight
501
rotates due to a movement of a user's arm, the rotation is transmitted to the first reduction wheel
502
through the intermediate first transmission wheel
503
. Regardless of the rotational direction of the first reduction wheel
502
, the second reduction wheel & pinion
600
rotates in one direction due to action of the draw finger
5041
and feed finger
5042
. The rotation of the second reduction wheel & pinion
600
is transmitted to the ratchet wheel
505
through a second transmission pinion
602
. The rotation of the ratchet wheel
505
winds the spiral spring of the barrel train
507
.
FIGS.
8
(
a
)-
8
(
b
) are explanatory views showing parts forming a conventional second reduction wheel & pinion. This second reduction wheel & pinion is structured by two members of a gear
601
(FIG.
8
(
a
)) and a pinion
602
(FIG.
8
(
b
)). The gear
602
has saw-formed teeth
611
for engagement with a pawl lever
504
. The gear
601
has at its center part a hole part
612
for receiving the pinion
602
therein. The hole part
612
is provided with stop parts
613
. Also, the pinion
602
has shaft parts
621
,
621
at its respective ends. Furthermore, a pinion part
622
is made in a two-stage form. The pinion
602
is provided with teeth
622
a
at the smaller diameter part and teeth
622
b
at the larger diameter part. Furthermore, the small diameter part of the two-staged part is provided with a cutout
623
. This smaller diameter part
622
a
is fitted in the hole part
612
of the gear
601
. The cutouts
623
,
623
engage the stop parts
613
,
613
to suppress rotation between the gear
601
and the pinion
602
. Also, the gear
601
and the pinion
602
are freely removable.
To manufacture a gear
601
, first a plate material is blanked by pressing to obtain a disk member. Next, teeth
611
are formed in a peripheral edge of this disk member. A hobbling machine is used for forming the teeth
611
. A hole part
612
is formed by a compound dice simultaneously with blanking a disk member. Meanwhile, in the manufacture of a pinion
602
, first a shaft
621
and two-staged pinion
622
are formed by a lathe. Next, the pinion
602
is removed from the lathe and attached on a milling machine to form cutouts
623
by milling. Also, the cutouts
623
may be formed by attaching on a forging machine. The pinion
602
is cut with teeth throughout the pinion part by the hobbling machine.
Upon shipping the movement, release of the spiral spring is made to conduct inspection for accuracy of the movement (date difference, for a self-winding watch). Specifically, the ratchet wheel
505
is rotated to make the spiral spring to be fitted in the barrel complete
507
into a fully wound state. One rotation of the barrel complete
507
requires 7 hours. Due to this, the ratchet wheel
505
is wound back by about 3.4 turns in order to obtain rotation of 1 day (24 hours). If the ratchet wheel
505
is wound back, the rotation of the ratchet wheel
507
is transmitted to a not-shown second wheel and third wheel, thus rotating a second hand and minute hand. An hour hand obtains rotation from a hour pinion of the second wheel through an hour wheel. Then, the second hand is measured for deviation at a time of the ratchet wheel
505
is wound back.
In the meanwhile, if the ratchet wheel
505
is to be wound back in a state the ratchet wheel
505
and the second reduction wheel & pinion
600
are in engagement with, the pawl lever
504
would be put into an engagement state with the second reduction wheel & pinion
600
, thus making difficult to perform winding back. Due to this, in order to release the engagement between the ratchet wheel
505
and the oscillating weight
501
, the second transmission bridge
552
shown in
FIG. 7
is removed to remove the pinion
602
of the second reduction wheel & pinion
600
from the gear
601
. This releases the engagement between the ratchet wheel
505
and the second reduction wheel & pinion
600
and the ratchet wheel
505
is allowed to freely rotate. Thus, accuracy inspection can be effectively conducted.
In the conventional second reduction wheel & pinion
600
, the wheel
601
and the pinion
602
are made in a separate structure so that in an inspection process the pinion
602
can be removed from the gear
601
. In an assembling state, engagement is made for the stop parts
613
of the hole part
612
with the cutouts
623
of the pinion
622
to thereby conducting positioning in a rotational direction. Meanwhile, in manufacturing a pinion
602
, a staged pinion
622
is cut with using a lathe and the pinion
602
is relocated onto a milling machine to cut cutout parts
623
. Furthermore, teeth cutting is made including the smaller diameter part
622
a
to be fitted in the gear
601
. Also, the gear
601
together with the hole part
612
is blanked by a press into a disk form, followed by teeth cutting by a hobbling machine.
However, there has been a problem that the manufacture of a second reduction wheel & pinion
600
in the above manner results in increase of manufacture process steps. Therefore, it is an object of the present invention to provide a transmission wheel that the manufacture process is to be reduced and method for manufacturing a same transmission wheel and a self-winding train wheel structure.
In order to achieve the above object, a transmission wheel according to the present invention has a structure having a pinion removably fitted in a hole part formed in a gear. An engagement part comprised of a string part or a chord-shaped stop portion with which teeth of the pinion engages is formed integral with the hole part of the gear. The pinion is fitted and assembled in the hole part of the gear such that teeth of the pinion and the engagement part are brought into engagement.
Conventionally, the gear and the pinion have been positioned with a cutout part and a stop part put in engagement. However, in this invention positioning is conducted utilizing teeth of a gear. That is, the gear is provided with an engagement part in a hole part so that teeth of a pinion is engaged with this engagement part. By doing so, the pinion can be omitted to re-form for a cutout part or the like.
A transmission wheel according to the present invention has a structure having a
Ishii Mitsuru
Jujo Koichiro
Adams & Wilks
Herrmann Allan D.
Seiko Instruments Inc.
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