US 3,991,789 AGranted

Infinitely adjustable cyclic timing device

AssigneeDana Corporation

InventorRichard J. Wojcikowski

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Abstract

An adjustable dwell cyclic timing device. An element having a timing surface with a radius or other measurement varying from a minimum value to a maximum value and back to a minimum value, and preferably having generally a heart shape when the element is in the form of a disc, is rotated in synchronism with a timing cycle. A sensor is positioned to sense the presence and absence of the timing surface in a region between the minimum and maximum radii or other measurements only when the element is rotated through a predetermined angular segment for generating a cyclic timing signal during a preselected time segment in each cycle. The sensor position is adjustable for changing the preselected segment of the timing signal in each cycle to provide a desired starting point and dwell for the generated timing signal. A plurality of sensors may be positioned adjacent the path of the rotating timing element for generating a plurality of different cyclic timing signals during different preselected time segments in each cycle.

Claims8

Dependent claims

An adjustable dwell cyclic timing device comprising, in combination, a timing element having a center of rotation and a timing surface with a continously changing radius from the center of rotation which for increasing angles in a predetermined direction around the center of rotation increases spirally from a minimum radius to a maximum radius and then decreases from the maximum radius back to the minimum radius, means for rotating said timing element about the center of rotation in synchronism with a timing cycle, at least one sensing means for generating a pulsed timing signal in response to sensing the presence and absence of said timing surface, means for mounting said sensing means for sensing the presence and absence of said timing surface at a predetermined point spaced from said sensing means and in the path of rotation of said element, such predetermined point lying in the region between the minimum and maximum radii of the rotating timing surface, and means for changing the location of said predetermined point within such region to adjust the point of occurrence of the timing signal to substantially any predetermined point in the timing cycle and to adjust the pulse duration of the generated timing signal to a predetermined duration ranging from substantially 0.degree. to substantially 360.degree. rotation of said timing surface.

An adjustable dwell cyclic timing device comprising, in combination, a timing element having a center of rotation, said timing element having a heart shaped timing surface with a radius from the center of rotation which spirally increases for an angle about the center of rotation increasing in a predetermined direction from 0.degree. at a point of minimum radius to a maximum radius at 180.degree. and spirally decreases back to such minimum radius through an increasing angle from 180.degree. to 360.degree., means for rotating said timing element about the center of rotation in synchronism with a timing cycle, at least one sensing means for generating a pulsed timing signal in response to sensing the presence and absence of said timing surface, and means for adjustably mounting said sensing means for sensing the presence of said timing surface at a predetermined point spaced from said sensing means while said timing element is rotated through a preselected angular segment, such predetermined point lying in the path swept by said rotated timing element and between said minimum and maximum radii from the center of rotation, whereby said sensing means generates a cyclic timing signal during a preselected time segment in the timing cycle.

Dependencies are inferred from the claim text.