Machine element or mechanism – Elements – Cams
Patent
1988-11-14
1990-01-30
Lindsey, Rodney M.
Machine element or mechanism
Elements
Cams
74827, F16H 5306
Patent
active
048965600
ABSTRACT:
An indexing device comprises a rotatably driven input shaft; a globoidal cam having, for the purpose of outputting intermittently the rotation of the input shaft, a taper rib defining a cam face which has a disk-shaped end face gradually yielding to a helical face about the input shaft; an output shaft to which the rotation of the input shaft is transmitted so that the output shaft may rotate intermittently; an indexing disk provided on the output shaft and having supports protruding radially outwardly at intervals along the circumference of the indexing disk, the ridge of the taper rib fitting between the adjoining supports; cam followers each disposed at the end of the support on the indexing disk and brought into engagement with the taper rib so as to be intermittently driven along the cam face; and gaps provided between the ridge of the taper rib and the supports opposite this, the gap being filled up by the elastic deformation of the cam follower so that the ridge of the taper rib may come into contact with the support. Thus, even though an excessive load is applied to the input shaft, etc., the generation of permanent deformation such as an imprint can be prevented, which will result in improvements in rigidity and durability of the indexing device, therefore improvement in reliability of the indexing device for a machine tool to which the indexing device of the present invention is applied.
REFERENCES:
patent: 2116142 (1938-05-01), Chappell et al.
patent: 2908186 (1959-10-01), Meyer
patent: 3618427 (1971-11-01), Schoepe
patent: 3850051 (1974-11-01), Woltjen et al.
Lindsey Rodney M.
Sankyo Manufacturing Company Ltd.
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