Device for fitting rivets or control therefor

Apparatus for attaching rivets and buttons to textiles, comprising:

• an electric motor;
• a cam plate rotationally driven by the electric motor;
• a plunger disposed for performing a riveting stroke cycle by completing an upward and downward movement, said movement being controlled by interaction of a top end of the plunger with said cam plate, wherein a course of travel of the plunger brings the plunger through a top dead-center position of the plunger;
• switch means for activating the apparatus to perform a sequence of cycles of attachments;
• means comprising an electronic control unit, operative during a running of the motor, for energizing the motor, and for briefly switching off the electric motor each cycle from running at a fixed preset angular velocity prior to a down stroke of said plunger, the top dead-center position of the plunger being at the beginning of a downward movement of the plunger in a riveting stroke;
• and
• braking means for stopping said electric motor when said electronic control unit switches off the electric motor, the electronic control unit establishing a preprogrammed cycle time and waiting time for each cycle and, upon attainment of the preprogrammed waiting time, releasing the braking means and switching the motor on again;
• whereby the waiting time and the cycle time are adjustable while maintaining acceleration of the plunger independent of the cycle time during each of a succession of riveting strokes.

A method for attaching rivets and buttons to textiles, comprising:

• operating an electric motor at a constant speed for rotationally driving a cam plate;
• employing the cam plate to operate a plunger, the plunger being disposed for performing a riveting stroke cycle by completing an upward and downward movement, said movement being controlled by interaction of a top end of the plunger with said cam plate, wherein a course of travel of the plunger brings the plunger through a top dead-center position of the plunger;
• by means of an electric control unit, operative during a running of the motor, energizing the motor and subsequently briefly switching off the electric motor each cycle from running at a fixed preset angular velocity upon attainment of the top dead-center position of said plunger, the top dead-center position of the plunger being at the beginning of a downward movement of the plunger in a riveting stroke;
• and
• stopping the motor by a braking means when said electronic control unit switches off the electric motor, the electronic control unit establishing a preprogrammed cycle time and waiting time for each cycle and, upon attainment of the preprogrammed waiting time, releasing the braking means and switching the motor on again;
• whereby the waiting time and the cycle time are adjustable while maintaining acceleration of the plunger independent of the cycle time during each of a succession of riveting strokes.

A method for attaching rivets and buttons to textiles, comprising:

• operating an electric motor at a constant speed for rotationally driving a cam plate;
• employing the cam plate to operate a plunger, the plunger being disposed for performing a riveting stroke cycle by completing an upward and downward movement, said movement being controlled by interaction of a top end of the plunger with said cam plate, wherein a course of travel of the plunger brings the plunger through a top dead-center position of the plunger;
• by means of an electric control unit, operative during a running of the motor, energizing the motor and subsequently briefly switching off the electric motor each cycle from running at a fixed preset angular velocity prior to a downstroke of said plunger, the top dead-center position of the plunger being at the beginning of a downward movement of the plunger in a riveting stroke;
• and
• stopping the motor by a braking means when said electronic control unit switches off the electric motor, the electronic control unit establishing a preprogrammed cycle time and waiting time for each cycle and, upon attainment of the preprogrammed waiting time, releasing the braking means and switching the motor on again;
• whereby the waiting time and the cycle time are adjustable while maintaining acceleration of the plunger independent of the cycle time during each of a succession of riveting strokes.