Abstract: A bobbin holder shaft is journalled in a bobbin holder shaft support that is, in turn elastically supported relative to a fixed frame. When the support weighs more than the shaft plus the full amount of yarn to be wound thereon, and the lowest order resonant speed is below the operating speed, a high operating speed can be achieved without inducing a resonant vibration even though a pronounced band or ribbon appeared on the wound yarn ball. In a preferred embodiment, the elastic support is provided by axially spaced O-rings and an oil-filled reservoir defined axially between them.

Abstract: The present invention provides a way of mounting a drive roll in a high speed winder, in which a drive roll bracket for holding a drive roll is pivotally supported by a pivot whose axis is an intersection line between a vertical plane equally dividing a distance between opposite remote end surfaces of a wound thread package and a horizontal plane that is tangential to a bottom surface of the drive roll or a horizontal plane in the proximity thereof, and a press contact force between said drive roll and the bobbin holder shaft or wound thread package is applied entirely by the intermediary of said pivot.

Abstract: Ways and means are described for transferring yarn in a turret type, surface drive automatic winder wherein the yarn having changed properties caused by inevitable tension variation upon transfer is wound as a waste winding, while loosening of the transfer tail is suppressed to eliminate failure from such a cause during the yarn transfer operation.

Abstract: An apparatus for producing precast concrete members which is efficient, mobile and cost saving, and comprises at least: a curing chamber having an opening in the portion which faces substantially a concrete placing section and having a plurality of support members to support form members leaving predetermined distance apart, a high temperature curing apparatus which is installed to said curing chamber, a concrete placing section in which necessary work for concrete placing is carried out, and a predetermined number of precast concrete form members which are diposed and moved horizontally and separately between said support members in said curing chamber and said concrete placing section by horizontal transfer means which comprise a plurality of rollers attached to said support members.