A clamping apparatus (10) for use in screen printing of curved articles comprising a housing (12) having mounted thereon a holding device (14). In a preferred embodiment the holding device (14) in its operative position is supported by an arm (34) and a post (78). A cable (236) is used to move the post (78) pivotally so as to move the holding device (14) to an inoperative position through an overcenter position. The holding device (14) can be restored to its operative position manually.
