A mandrel with a biasing assembly that extends the mandrel's life for turning of sheet materials. The mandrel's biasing assembly having a pivot, sleeve, cup and screw that connect a gripper to the arbor and works to alleviate the forces that can cause damage to such a winding machine.

A mandrel with a biasing assembly that extends the mandrel's life for turning of sheet materials. The mandrel's biasing assembly having a pivot, sleeve, cup and screw that connect a gripper to the arbor and works to alleviate the forces that can cause damage to such a winding machine.

An apparatus (100) for making a coil (B) comprises a feed unit (2) configured to feed at least one strip-shaped article (N) and a winding unit (1). The winding unit includes a plurality of winding heads (10) each of which supports a gripping device (11) of a portion of said strip-shaped article (N), and a movement device (3) of said winding heads (10) configured to move said winding heads (10) along a working path (P). Each winding head (10) is configured to wind said strip-shaped article (N) so as to make said coil (B), wherein each gripping device (11) comprises a pair of pins (12, 13) configured to hold said strip-shaped article (N) between them, at least one of said pins (12, 13) being movable so as to join the other pin holding said strip-shaped article (N) between them.

A winding apparatus for secondary batteries includes a first clamp having a first contact portion to be in contact with a separator in a longitudinal direction, a second clamp having a second contact portion to be in contact with the separator in the longitudinal direction, the second contact portion being configured to be engaged with the first contact portion while the separator is therebetween, blades surrounding the first clamp and the second clamp, the blades being configured to allow the separator to be wound therearound, and a driver configured to move the first clamp and the second clamp toward each other and away from each other.

A manual winding device comprises a wire bracket, a clamp, a winder, and a tension maintainer. The wire bracket supplies wire, while the clamp holds it in place. The winder, adjacent to the clamp, includes a driving mechanism and a coil former holding unit. The coil former holding unit is configured to mount a coil former. The driving mechanism is configured to drive the coil former holding unit to rotate, winding the wire onto the coil former. The tension maintainer, located between the clamp and the winder, includes a sliding base, a sliding block, and four connecting rods forming a quadrilateral. The sliding block is movably disposed on the sliding base. Two opposite connection points are pivotally mounted on the base and sliding block, while the other two points each hold a pulley around which the wire passes. The tension maintainer ensures the wire's tension is maintained during winding.