Test method and device for screwers
First Claim
1. A test method for a screwer comprising the steps of:
- connecting the screwer to a rotatable attachment element;
powering the screwer to rotate the attachment element;
measuring the attachment element speed;
power-supplying an electric motor to bring the electric motor to a speed close to said measured speed of the attachment element;
connecting a driving shaft of the electric motor to the attachment element;
causing the motor to follow a braking ramp while the torque transmitted from the screwer to the driving shaft is measured.
3 Assignments
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Accused Products
Abstract
A test method for a screwer performs the steps of connecting the screwer to a rotatable attachment element, screwing down the screwer, measuring the attachment element speed, power-supplying an electric motor to bring it to a speed close to the measured speed, connecting the shaft of the electric motor to the attachment element, and causing the motor to follow a braking ramp while the torque transmitted from the screwer to the driving shaft is measured. A device in accordance with this method includes a rotatable attachment element to which the screwer to be tested is applied, and an electric motor connected to the attachment element through a releasable coupling connecting the motor to the attachment element on achievement of a motor speed close to that of the attachment element. The motor is controlled for following a braking ramp based on a predetermined law, while a transducer measures the transmitted torque between the attachment element and braking element.
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Citations
13 Claims
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1. A test method for a screwer comprising the steps of:
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connecting the screwer to a rotatable attachment element; powering the screwer to rotate the attachment element; measuring the attachment element speed; power-supplying an electric motor to bring the electric motor to a speed close to said measured speed of the attachment element; connecting a driving shaft of the electric motor to the attachment element; causing the motor to follow a braking ramp while the torque transmitted from the screwer to the driving shaft is measured. - View Dependent Claims (2, 3, 4)
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- 5. A test device for a screwer comprising a rotatable attachment element to which the screwer to be tested is applied, a braking element connected to the attachment element, which attachment element undergoes controlled braking according to a predetermined law and torque measuring means connected for measurement of the transmitted torque between the attachment element and braking element, wherein the braking element is an electric motor connected to the attachment element by releasable coupling means connecting the motor to the attachment element upon achieving a motor speed close to that of the attachment element.
Specification