PURPOSE:To simplify the structure and to reduce the manufacturing cost, by arranging a subordinate hand at a position off an hour and minute hand shaft, and arranging the 2nd minute wheel in the middle of train wheel group extending from a corrector intervening wheel to said subordinate hand. CONSTITUTION:The subordinate hand is fitted to a subordinate hand wheel 10. A minute wheel 11 engages the minute pinion 81 of a center wheel 8 and an hour intervening wheel 12. The 2nd minute wheel 13 engages a canon intervening pinion 12a fixed to the hour intervening wheel 12 and a time difference hour wheel 9 on one side and also engages the corrector intervening wheel 17 and loosely engage the 2nd minute pin 15 fixed to a base plate 14 on the othr side; and a endshake is held by a back plate 16. Consequently, the structure is simplified and the manufacturing cost is reduced because of the simple structure.

Train wheel of timepiece

PURPOSE:To enable a thinner shape and smaller size of a time piece without requiring any complicated working by building a slip mechanism with a jumper gear and a jumper pinion to allow the curtailing of the number of parts and a subassembly. CONSTITUTION:A jumper gear 4 has a shaft hole 4a comprising a semicircle, an opening and a jumper section 4c containing a spring 4b near the opening located at the center thereof and a tooth form is formed on the outer circumference thereof. A gear 4 is located sectionally between a 24 hour transmission gear 5 and a jumper wheel seat 6 and an arc circular part of the shaft hole 4a is pivoted at a tooth outer diameter of a jumper pinion 7. The jumper section 4c is pressed to engage the tooth form of the jumper pinion 7 by a force of the spring 4b to form a slip mechanism. The gear 4 is integrated as jumper wheel 3 being engaged with the jumper section 4c and the jumper pinion 7 and in the normal running pointers, the rotation of a cylinder 2 is transmitted to a sub hour wheel 8. The slip mechanism of the jumper wheel 3 generates a slip torque with the jumper section 4c overcoming the force of the spring 4b to override the tooth form of the jumper pinion 7.

Time correction structure of timepiece

PROBLEM TO BE SOLVED: To obtain a hour correction structure which is simple, low-cost and thin and which can be miniaturized by arranging a jumper wheel having a slip mechanism in the intermediate position between a main hour display member and a subhour display member. SOLUTION: A jumper wheel as an intermediate wheel which transmits the rotation of a tube wheel 2 to a subhour wheel 8 is constituted of a jumber gear 4 which is engaged with the tube wheel 2, a 24-hour transmission wheel 5 which is engaged with the subhour wheel 8, and a jumper wheel seat and a jumper pinion 7. Then, the arc part of a shaft hole 4a at the gear 4 is fitted to the gear outside diameter of the pinion 7, a jumper part 4c is pressed to the tooth profile of the pinion 7 by the force of a spring 4b so as to be coupled, and a slip mechanism is formed. Then, the jumper wheel is arranged in the intermediate position between a main display member which displays a main hour and a subdisplay member which displays a subhour, and a part between the display members and a transmission mechanism is slipped when a correction mechanism is operated. In this manner, since the hour correction structure can be arranged without overlapping other watch components, a small and thin watch can be obtained.

Hour correction structure for watch

PURPOSE:To eliminate the need for photographing by uing the horizontal scanning lines of a TV camera as a second optical grating in a system of using first, second optical gratings.

Asai Hiroshi

Papers

Moire contour line measuring app aratus