Horology: time measuring systems or devices – With calendar indicator
Patent
1980-02-23
1983-02-08
Roskoski, Bernard
Horology: time measuring systems or devices
With calendar indicator
368 37, 368 77, 368221, G04B 1924
Patent
active
043726879
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to timepieces, more specifically to small wrist watches, and has particular reference to instantaneous calendar devices used therein.
DESCRIPTION OF THE PRIOR ART
Well known in the art are instantaneous timepiece calendar devices comprising an actuator composed of a spring, a tappet, and a calendar wheel mounted coaxially with a cam, a rotary shifter operating a date ring and a day disk, and stops. When the calendar wheel rotates, its spoke engages a pin provided on the cam, which is rotatably mounted on the axle of the calendar wheel, whereby the cam is rotated. The cam is connected with the rotary shifter which has projections arranged to engage the teeth of the date ring and of the day disk. The tappet is mounted on the watch plate. One of the tappet arms rides on the cam, thereby winding the spring which is also mounted on the plate. The actuator accumulates energy required for rapidly shifting the date ring and the day disk once in 24 hours. The shifting of the date ring and the day disk is effected by the shifter when the tappet leaves the cam peak.
However, due to the above described arrangement of the tappet, spring and cam in the calendar device, the actuator occupies a considerable area of the watch plate. This disadvantage is a hindrance to employing such a calendar device in small wrist timepieces, for example, in lady's watches.
Also known in the art is an instantaneous timepiece calendar device wherein the tappet is made as a cut spring one end of which is rigidly secured to the watch plate, whereas the other end rides on the side surface of the cam. The day disk is shifted by the cam pin which operates the disk through an intermediate star wheel.
With this constructional arrangement, the actuator suffers from the disadvantage that it occupies a considerable area and adds to frictional losses of energy due to the use of the intermediate star wheel for transmitting rotation from the cam to the day disk. A further disadvantage is that the device under consideration is poorly suited for manufacture since the tappet made in the form of a cut spring necessitates extra time and labor for adjusting the calendar mechanism and excludes the possibility of using a spring band, which possesses higher stability of force characteristics and is conventionally employed in actuators.
Referring to USSR Inventor's Certificate 245669, class G 04B19/24 published in 1969, the instantaneous calendar device disclosed therein comprises a cam-type actuator, two shifting elements, one for a date ring and the other for a day disk, and stops.
The shifting elements are each made in the form of two pins located on the face of a wheel and passing through a slot in a coaxial intermediate wheel which meshes with one of the watch train wheels.
This calendar device suffers from the disadvantage that, due to the design of the shifting mechanism, additional adjustments are required in assembling the device.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an instantaneous calendar device with the actuator thereof designed so as to enable decreasing the dimensions of the calendar device and thereby to facilitate incorporation thereof in small lady's wrist watches.
The invention provides an instantaneous calendar device comprising an actuator composed of a spring, a tappet and a calendar wheel coaxial with a cam, a rotary shifter operating a date ring and a day disk, and stops.
According to the invention, the actuator cam is rigidly secured to the stationary part of the calendar device, whereas the tappet and the spring are mounted on the rotary shifter.
Owing to the design wherein the cam is rigidly secured to the stationary part, whereas the tappet and the spring are mounted on the rotary shifter, the major elements of the device are interconnected in a novel manner so that they occupy substantially less area than in the devices of the prior art, said area being equal to the projection of the calendar wheel onto the watch plate, and can be arranged wi
REFERENCES:
patent: 3186159 (1965-06-01), Schneiter
patent: 3667211 (1972-06-01), Schneider
patent: 3673789 (1972-07-01), Tsuzuki et al.
patent: 3721085 (1973-03-01), Zaugg
patent: 3875739 (1975-04-01), Mougin
patent: 3911667 (1975-10-01), Komiyama
patent: 4142109 (1980-01-01), Teramoto
patent: 4240249 (1980-12-01), Malkin et al.
Krasovsky Boris P.
Malkin Daniel D.
Melnik Vladimir V.
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