Improvements in or relating to trip cam arrangements

摘要

988,426. Cams. K. MAECKER. March 7, 1962 [March 7, 1961 (2); Sept. 16, 1961], No. 8789/62. Heading F2K. [Also in Division B3] A device having a groove in which a trip-cam may be secured, comprises separate strips 1-4, Fig. 2, the feet 5 of which are wider than the heads 6 and are in contact with each other. The strips may be secured to a movable part of a machine, and, as shown, provide four grooves for trip-cams used for automatic control of the machine. A tripcam for clamping in the grooves 115, Fig. 7, may comprise a head 102 of synthetic resin carrying a pin 157 which is supported on a pivot 158 in the cambase 101. The base is clamped in the groove by a lever 113 wider for at least part of its length than the narrowest part of the groove and pivoted on a tongue 150 attached to one end of the base. Passing through the other end of the base is a clamping screw 120 engaging screwthreads in the lever. Fine adjustment of the cam-head 102 relatively to the clamped base is by a screw 131 which turns the head about the pivot 158, against the influence of a spring 137. The cam of Figs. 10 and 11 can be inserted through the narrow part of the groove-opening, a member 123 being turned through 90 degrees to engage its shoulders 1211, 1221, beneath the grooveflanges 1101, 1111. The member is supported on the clamping lever 1131 which is pivoted at one end on a hook 116 and at the other engaged by the screw 1201 operating to clamp the shoulders 1211, 1221 against the flanges. Pins 106, 107 secure the cam-head 1021 non-adjustably in a channel in the base 1011. In a modification of this construction, Figs. 15 and 16, the head 1021 is adjustable in the base 1011 against the pressure of a spring 1371, by a lever 1331 operated by a screw 1311. A helical or a cup spring 140 in an opening in the head 1021 biases the head against the bottom of the groove in the base 1011. Instead of using a lever 1331, the screw may act directly on the head 1021. In a further construction, Fig. 18, having an inset identification plate 223, the screwthreaded bore 218 in the clamping member 213 is arranged vertically beneath the cam-head 208. The member 213 engages a surface 222 on the cam-base as it clamps against the undersides 203, 204 of the groove flanges.