Kabushiki Kaisha Daini Seikosha

Yoshio Tatsumi

Nobuo Tsukada

Eiichi Matsuura

Keikichi Takahashi

Tooru Kadowaki

A battery lead plate assembly comprises a one-piece integral structure for connecting together a circuit block and a battery of an electronic timepiece. The assembly comprises a casing composed of electrically insulative material and having a slotted arm portion, a lead plate element composed of electrically conductive material and having an end portion inserted into the slot, and an insulating plate composed of electrically insulative material and having an end portion inserted into the slot - all three parts being thermo compression bonded into a one-piece integral structure. The lead plate element is configured so as to contact and make electrical connection between the circuit block and the battery and the insulating plate is configured so as to extend along the side of the lead plate element opposite the battery for electrically insulating the lead plate element from other parts of the timepiece.

Battery lead plate member for an electronic wrist watch

A timepiece has a wheel and pinion mechanism having upper and lower shafts rotatably mounted in bearings which are fixed in a pair of spaced apart plates. The bearing fixed in one plate has a cylindrical portion which surrounds the pinion portion of the wheel and pinion mechanism and which is spaced therefrom a slight distance which is sufficiently small to enable the pinion portion to abut the inner wall of the bearing cylindrical portion in the event the wheel and pinion mechanism tilts on its lower shaft a predetermined amount from its intended orientation thereby preventing falling of the mechanism during assembly.

Bearing for a timepiece train

In the gear train of a wrist watch a jewel mounted on the lower side of a gear wheel connected to the second hand engages the enlarged upper end of the center pipe. The friction factor between the gear wheel and the center pipe is thereby reduced and the performance of the watch is improved.

Growing community of inventors

Tokyo, Japan

Yoshio Tatsumi