Tool, apparatus and method of testing a fixture
AssigneeHavant International Limited
InventorsDavid J. Orriss, Anthony R. Hearn
Life of this patent
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Abstract
A tool (20) is provided for mounting in and testing a fixture (12) used for mounting a device, such as a disk drive, having an arm which is movable to selected locations by an actuator. The tool has a movable member (25) which is movable to mimic movement of an arm of such a device mounted in the fixture (12). Movement of the tool (20) in the fixture (12) as a reaction to movement of the movable member (25) is measured and compared with a standard to enable the fixture to be passed or failed.
Claims16
A tool for mounting in and testing a fixture used for mounting a device having an arm which is movable to selected locations by an actuator, the tool being subjected to an acceleration, the tool comprising:
- a movable member which is movable to mimic movement of an arm of said device mounted in the fixture;
- and,
- at least one accelerometer for measuring the acceleration of the tool in a fixture in which the tool is mounted as a reaction to movement of the movable member.
A tool for mounting in and testing a fixture used for mounting a device having an arm which is movable to selected locations by an actuator, the tool comprising:
- a movable member which is movable to mimic movement of an arm of a device mounted in the fixture;
- and
- means for measuring movement of the tool in a fixture on which the tool is mounted as a reaction to movement of the movable member, wherein the measuring means is arranged to measure rotary movement of the tool and comprises two accelerometers arranged on a line passing through a centre of rotation of the tool and on opposite sides of said centre of rotation such that the difference between the outputs of said accelerometers provides a measure of rotary movement of said tool only.
Apparatus for testing a fixture used for mounting a device having an arm which is movable by an actuator, the apparatus comprising:
- a tool having a movable member which is movable to mimic movement of an arm of a device mounted in the fixture;
- means for measuring movement of the tool in a fixture on which the tool is mounted as a reaction to movement of the movable member;
- and,
- movement comparing means for comparing the movement of the movable member with movement of the tool in a fixture in which the tool is mounted as a reaction to movement of the movable member;
- drive means for providing a drive signal to drive the movable member to move within a fixture;
- means for outputting a movement signal indicative of movement of the tool in fixture in which the tool is mounted as a reaction to movement of the movable member;
- the movement comparing means comprising signal comparing means for comparing the drive signal with the movement signal;
- and,
- determining means for determining whether the fixture passes or fails on the basis of said comparison.
Apparatus for testing a fixture used for mounting a device having an arm which is movable by an actuator, the apparatus comprising:
- a tool having movable member which is movable to mimic movement of an arm of a device mounted in the fixture;
- means for measuring movement of the tool in a fixture on which the tool is mounted as a reaction to movement of the movable member;
- and,
- movement comparing means for comparing the movement of the movable member with movement of the tool in a fixture in which the tool is mounted as reaction to movement of the movable member;
- wherein the measuring means comprises an accelerometer for measuring the acceleration of the tool in a fixture in which the tool is mounted as a reaction to movement of the movable member.
Apparatus for testing a fixture used for mounting a device having an arm which is movable by an actuator, the apparatus comprising:
- a tool having a movable member which is movable to mimic movement of an arm of a device mounted in the fixture;
- means for measuring movement of the tool in a fixture on which the tool is mounted as a reaction to movement of the movable member, the measuring means being arranged to measure rotary movement of the tool;
- and,
- movement comparing means for comparing the movement of the movable member with movement of the tool in a fixture in which the tool is mounted as a reaction to movement of the movable member;
- wherein the measuring means comprises two accelerometers arranged on a line passing through a centre of rotation of the tool and on opposite sides of said centre of rotation such that the differences between the outputs of said accelerometers provides a measure of rotary movement of said tool only.
A method of testing a fixture used for mounting a device having an arm which is movable by an actuator, the method comprising the steps of:
- inserting a tool having a movable member in said fixture;
- moving the movable member in the fixture to mimic movement of an arm of a device normally mounted in the fixture by applying a drive signal to the movable member to cause the movable to move;
- measuring movement of the tool in the fixture as a reaction to movement of the movable member by obtaining an output signal representative of the movement of the tool in response thereto;
- and,
- comparing the movement of the movable member with movement of the tool in response thereto by comparing the drive signal with the output signal to obtain a transfer function for the fixture, the transfer function being compared with a standard in the determining step.
Dependencies are inferred from the claim text.