Bobbin holder

摘要

PCT No. PCT/JP81/00140 Sec. 371 Date Feb. 16, 1983 Sec. 102(e) Date Feb. 16, 1983 PCT Filed Jun. 16, 1981 PCT Pub. No. WO82/04433 PCT Pub. Date Dec. 23, 1982.A bobbin holder including a hanging member suspended from an upper suspending structure and rotatable around a center axis with a cylindrical outer surface, a chamber, three guide grooves, and three rockably supporting portions. The three guide grooves open into the chamber and extend in a direction of the axis. The guide grooves are arranged radially and symmetrically with respect to the axis. Three rockable elements are rockable in a limited range outwardly and inwardly around the bottom portions thereof through the guide grooves. Each rockable element has a triange-like profile and a bottom portion supported with the rockably supported portion. An upper outside surface of each rockable element is formed as an inclined shoulder and an upper inside surface of each element is formed as an engaging surface. The upper outside surfaces are arranged when in the outward position along a conical surface of an imaginary cone having a top angle of 60 to 90 degrees. A core element is contained in the chamber and is shiftable along the center axis. Structure is provided for locking the core member in an upper shifted position or a lower shifted position so that when in the lower position the core member engages with the engaging surfaces of the rockable elements in order to hold the same opened outwardly and when the core member shifted into the upper position the core member is disengaged from the engaging surfaces in order to allow the rockable elements to rock freely.