Connection Structure of Watch Stem and Setting Wheel

Abstract

The invention discloses a connecting structure for a watch handle shaft and a needle poking wheel. The connecting structure is large in transmission capacity, wide in designed margin and low in manufacture cost and comprises the needle poking wheel made of a plastic material and the handle shaft which penetrates through a shaft sleeve of the needle poking wheel and can perform axial movement relative to the needle poking wheel. The shaft sleeve is in interference fit with the front end portion of the handle shaft in cylindrical face mode, the front end face of the handle shaft is provided with at least one strip-shaped groove capable of dividing the end face into at least two portions, and lateral sides of the strip-shaped grooves are parallel. The strip-shaped grooves are arranged on the front end face of the handle shaft, so that when tight fit is performed, the cylindrical face interference fit in the prior art is changed into profile connecting fit. Therefore, the transmission capability, transmission efficiency, transmission stabilization degree and accuracy rate are improved greatly. The designed margin of the shaft sleeve of the needle poking wheel and the handle shaft can be further improved, processing accuracy is reduced, a complicated handle shaft manufacture process is simplified, material and labor costs are reduced, and production efficiency of the handle shaft and the needle poking wheel is improved.

Description

technical field [0001] The invention relates to a quartz watch, in particular to a connection structure between a quartz watch stem and a setting wheel. Background technique [0002] Usually, the stem of a quartz watch is placed in the bushing of the setting wheel. The front end of the stem is the same as the cross section of the bushing of the setting wheel, both of which are circular in shape, and there is an interference fit between them. When the watch is running normally, its stem Push it into the watch case. At this time, the front end of the stem breaks away from the engagement with the setting wheel, and the setting wheel rotates with the span wheel. When the hour hand moves normally, when it is necessary to adjust the time, pull the stem outward to make it work. Axial short-distance movement, at this time, the front end of the handle shaft is tightly fitted with the setting wheel shaft and occluded together, at this time, turning the handle arranged at the outer end...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the interference fit between the front end of the watch stem and the bushing, a slight negligence in the work difference during the design and manufacturing process will lead to problems such as slippage of the stem or difficulty in pulling out the stem during the adjustment time

[0005] 2) In order to achieve the best interference fit between the watch handle shaft and the shaft sleeve, the difficulty of manufacturing and processing is increased, and the corresponding labor, material and mold costs are also greatly increased

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