Societe Suisse Pour L'industrie Horlogere Management Services S.a.

Martial Voumard

Raymond Huguenin

Hubert Matthey

Dominique Peyraud

An apparatus is provided comprising three elongated vacuum chambers arran in line one after another whereby a component carrying means may be transferred successively from one chamber to another. Of these three chambers the first and third comprise air locks and the intermediate chamber contains heat sealing means whereby components undergoing sealing may be soldered under vacuum. By providing a permanent magnet on each end of the component carrying means this may be shifted between vacuum chambers by external application of a magnet. The overall length of the apparatus is reduced since only three chambers are required and the intermediate chamber may be made shorter than would be the case where no such arrangement is provided.

Transfer machine for sealing electronic or like components under vacuum

Apparatus for automatically adjusting the frequency of a piezoelectric reator in the form of a bar or plate includes circuitry for applying a voltage to the resonator to cause it to resonate, measuring the frequency of the resonator continuously during a frequency adjusting cycle, continuously comparing the measured frequency with a desired frequency to obtain a difference frequency value, storing the difference frequency value at the beginning of the adjusting cycle, deriving from the difference frequency value a threshold value equal to one-half of the difference frequency value, comparing the threshold value with the frequency difference value, removing material by a sand blast from a first extremity of the resonator as long as the difference frequency value is greater than the threshold value and thereafter removing material from the other extremity of the resonator until the difference frequency value is nil.

Apparatus for automatically adjusting the frequency of piezoelectric

A process for automatically adjusting the frequency of a piezoelectric reator in the form of a bar or plate includes the steps of applying a voltage to the resonator to cause it to resonate, measuring the frequency of the resonator continuously during a frequency adjusting cycle, continuously comparing the measured frequency with a desired frequency to obtain a difference frequency value, storing the difference frequency value at the beginning of the adjusting cycle, deriving from the difference frequency value a threshold value equal to one-half of the difference frequency value, comparing the threshold value with the frequency difference value, removing material by a sand blast from a first extremity of the resonator as long as the difference frequency value is greater than the threshold value and thereafter removing material from the other extremity of the resonator until the difference frequency value is nil.

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Bienne, Switzerland

Martial Voumard