Clamping chuck in winding machines

摘要

An improved clamping chuck for bobbins on thread winding machines wherein a bobbin carrier is removably mounted and held on an expandable chucking spindle by means of a plurality of clamping elements distributed in an annular cylindrical inner space formed between the spindle and an outer cylindrical sleeve mantle, each clamping element moving radially outwardly and inwardly of the mantle surface through openings which define the clamping position. The improvement comprises a combination of special clamping elements, each of which has a radially innermost sliding end surface which is inclined with respect to the chuck axis and each of which is paired with a wedge-shaped thrust member with its radially outermost end surface correspondingly inclined with respect to the chuck axis for sliding support in contact with its paired clamping element, such that reciprocal axial movement of the thrust member on the spindle causes the clamping element to move radially between an extended clamping position and a retracted release position. The improvement further includes spring and pneumatic actuated cage means with axially spaced and opposing annular end walls acting as pistons to exert opposite axial forces on each of the thrust members in order to produce the desired reciprocal movement, the associated spring means acting to maintain a radial gripping force by the radially extended clamping element while the chuck is in operation and the associated pneumatic means exerting a force opposing the spring means in order to release each clamping element.