Process and apparatus for winding a thread supplied at a constant speed onto a cross wound bobbin

Apparatus for winding thread supplied at a constant speed and with a traversing thread guide onto a cross-wound bobbin so that variations in thread tension are automatically compensated for, said apparatus comprising:

• a drive shaft driven at a constant rotational speed;
• a drive roll for driving the bobbin during the winding operation, supported about said drive shaft for free rotation thereabout in a fixed axial position;
• variable speed transmission means for controllably transmitting selected amounts of rotational power from said drive shaft to said drive roll, rotatable coupling means for drivingly coupling said drive roll to said variable speed transmission means for transmission of rotational power to said drive roll, said transmission means including at least a two-stage mechanism with an actuable transmission member for effecting changes in said rotational power transmitted through said rotatable coupling means to said drive roll so that actuation of said actuable transmission member is isolated from said rotatable coupling means;
• first regulating means for measuring tension in thread being wound on the bobbin and detecting variations therein, for automatically compensating for minor variations in said tension such as periodic fluctuations induced by operation of the traversing thread guide, and for outputting an indication of detected variations outside a predetermined range;
• second regulating means, responsive to said indication output by said first regulating means, for actuating said variable speed transmission means actuable transmission member to vary the rotational speed of said drive roll so as to wind thread onto the bobbin at uniform tension throughout the winding process;
• and
• return means for biasing said variable speed transmission means actuable transmission member to an adjustable basic position, which position determines the maximum amount of rotational power transmitted by said transmission means.

Apparatus for winding thread supplied at a constant speed and with a traversing thread guide onto a cross-wound bobbin so that variations in thread tension are automatically compensated for, said apparatus comprising:

• a drive shaft driven at a constant rotational speed;
• a drive roll for driving the bobbin during the winding operation, supported about said drive shaft for fee rotation thereabout in a fixed axial position;
• variable speed transmission means for controllably transmitting selected amounts of rotational power from said drive shaft to said drive roll, rotatably coupling means for drivingly coupling said drive roll to said variable speed transmission means for transmission of rotational power to said drive roll, said transmission means including at least a two-stage mechanism with an actuable transmission member for effecting changes in said rotational power transmitted through said rotatable coupling means to said drive roll so that actuation of said actuable transmission member is isolated from said rotatable coupling means;
• first regulating means for measuring tension in thread being wound on the bobbin and detecting variations therein, for automatically compensating for minor variations in said tension such as periodic fluctuations induced by operation of the traversing thread guide, and for outputting an indication of detected variations outside a predetermined range;
• and
• second regulating means, responsive to said indication output by said first regulating means, for actuating said variable speed transmission means actuable transmission member to vary the rotational speed of said drive roll so as to wind thread onto the bobbin at uniform tension throughout the winding process;
• wherein
• said first regulating means includes a resiliently mounted bar which presses against the thread during operation of said apparatus, and further includes a nose element extending parallel to said drive roll, adapted for external actuation with a servicing device.

Apparatus for winding thread supplied at a constant speed and with a traversing thread guide onto a cross-wound bobbin so that variations in thread tension are automatically compensated for, said apparatus comprising:

• a drive shaft driven at a constant rotational speed;
• a drive roll for driving the bobbin during the winding operation, supported about said drive shaft for free rotation thereabout in a fixed axial position;
• variable speed transmission means for controllably transmitting selected amounts of rotational power from said drive shaft to said drive roll, rotatable coupling means for drivingly coupling said drive roll to said variable speed transmission means for transmission of rotational power to said drive roll, said transmission means including at least a two-stage mechanism with an actuable transmission member for effecting changes in said rotational power transmitted through said rotatable coupling means to said drive roll so that actuation of said acutable transmission member is isolated from said rotatable coupling means;
• first regulating means for measuring tension in thread being wound on the bobbin and detecting variations therein, for automatically compensating for minor variations in said tension such as periodic fluctuations induced by operation of the traversing thread guide, and for outputting an indication of detected variations outside a predetermined range;
• and
• second regulating means, responsive to said indication output by said first regulating means, for actuating said variable speed transmission means actuable transmission member to vary the rotational speed of said drive roll so as to wind thread onto the bobbin at uniform tension throughout the winding process;
• wherein
• said first regulating means includes a resiliently mounted bar which presses against the thread during operation of said apparatus and accepts minor variations in tension of such thread without outputting said first regulating means indicating;
• and wherein said apparatus further includes
• a slotted connection, including an adjustable length slot, located between said bar and said second regulating means for adjusting said variable speed transmission means.

Apparatus for winding thread supplied at a constant speed and with a traversing thread guide onto a cross-wound bobbin so that variations in thread tension are automatically compensated for, said apparatus comprising:

• a drive shaft driven at a constant rotational speed;
• a drive roll for driving the bobbin during the winding operation, supported about said drive shaft for free rotation thereabout in a fixed axial position;
• variable speed transmission means for controllably transmitting selected amounts of rotational power from said drive shaft to said drive roll, rotatable coupling means for drivingly coupling said drive roll to said variable speed transmission means for transmission of rotational power to said drive roll, said transmission means including at least a two-stage mechanism with an actuable transmission member for effecting changes in said rotational power transmitted through said rotatable coupling means to said drive roll so that actuation of said actuable transmission member is isolated from said rotatable coupling means;
• first regulating means for measuring tension in thread being wound on the bobbin and detecting variations therein, for automatically compensating for minor variations in said tension such as periodic fluctuations induced by operation of the traversing thread guide, and for outputting an indication of detected variations outside a predetermined range;
• and
• second regulating means, responsive to said indication output by said first regulating means, for actuating said variable speed transmission means actuable transmission member to vary the rotational speed of said drive roll so as to wind thread onto the bobbin at uniform tension throughout the winding process;
• wherein
• said apparatus winds conical cross-wound bobbins;
• said variable speed transmission means is disposed for driving a member connected to the drive roll and situated adjacent to the small diameter of such conical cross-wound bobbin;
• and
• said drive roll has at least two loose pulleys and a drive pulley arranged between said loose pulleys.