Method and system for detecting brake wear in a metal forming machine
First Claim
1. A safety system for a machine having a work producing member which is movable by a drive system and which is stopped by a brake comprising:
- means responsive to the drive system for detecting the time interval between the time of energization of the brake and the time that the work producing member stops,means for comparing said time interval with a predetermined magnitude, andalarm means operable if said time interval exceeds the predetermined magnitude.
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Accused Products
Abstract
The specification discloses a method and system for detecting brake wear in a metal forming machine having a ram operable by a rotative drive and further having a brake for stopping the ram. The amount of rotation of the drive for the machine is determined from the time of energization of the brake to the time of stopping of the ram by the brake. This determined amount of rotation is compared with a predetermined magnitude. An alarm is generated as the determined amount of rotation of the drive exceeds the predetermined magnitude, thereby indicating excessive brake wear. Further operation of the ram is then prevented upon the generation of an alarm. The specification further discloses a check system for checking the operation of various components of the detection system prior to detecting of the brake wear.
120 Citations
20 Claims
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1. A safety system for a machine having a work producing member which is movable by a drive system and which is stopped by a brake comprising:
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means responsive to the drive system for detecting the time interval between the time of energization of the brake and the time that the work producing member stops, means for comparing said time interval with a predetermined magnitude, and alarm means operable if said time interval exceeds the predetermined magnitude. - View Dependent Claims (2, 3)
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4. A safety system for a machine having a work producing member which is movable by a drive system and which is stopped by a brake comprising:
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a proximity sensor for detecting movement of gear teeth in the drive system between the time of energization of the brake and the time that the work producing member stops, and alarm means operable if the amount of movement exceeds a predetermined magnitude. - View Dependent Claims (5, 11)
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6. In a metal forming machine having a ram operable by a rotative drive system and a brake for stopping the ram, the combination comprising:
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means for sensing the rotation of the drive system, means responsive to said sensing means for determining the amount of rotation of the drive system from the time of energization of the brake and the time of stopping of the ram, means for comparing the determined amount of rotation of the drive system with a predetermined magnitude, alarm means for being operated if the determined amount of rotation of the drive system exceeds the predetermined magnitude, and means for automatically preventing further operation of the work producing member if the determined amount of rotation of the drive system exceeds the predetermined magnitude. - View Dependent Claims (7, 8, 9)
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10. In a metal forming machine having a ram operable by a rotative drive system and a brake for stopping the ram, the combination comprising:
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a sensor for sensing rotative movement of structure associated with a gear in the drive system and for generating electrical signals in response thereto, means responsive to said electrical signals for determining the amount of rotation of the drive system from the time of energization of the brake and the time of stopping of the ram, means for comparing the determined amount of rotation of the drive system with a predetermined magnitude, and alarm means for being operated if the determined amount of rotation of the drive system exceeds the predetermined magnitude.
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12. In a press machine having a ram operable by a rotative drive and a brake operable to stop the ram, the combination comprising:
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timing means responsive to electrical signals representative of the amount of rotation of the drive, means responsive to a first angular position of the drive for directing a first portion of said electrical signals to said timing means, self-check circuitry for preventing further rotation of the drive if a predetermined number of the first portion of said electrical signals are not received by said timing means, means responsive to the energization of the brake for directing a second portion of said electrical signals to said timing means until the rotation of the drive is stopped; and means for preventing further rotation of the drive if the second portion of said electrical signal exceeds a predetermined magnitude. - View Dependent Claims (13, 14, 15, 16)
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17. A method of detecting brake wear in a metal forming machine having a ram operable by a rotative drive and having a brake for stopping the ram comprising:
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sensing the amount of rotation of the drive, determining the amount of rotation of the drive from the time of energization of the brake and the time of stopping of the ram by the brake, comparing the determined amount of rotation of the drive with a predetermined magnitude, and generating an alarm if the determined amount of rotation exceeds the predetermined magnitude. - View Dependent Claims (18, 19, 20)
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Specification