| 摘要 |
<p>1,151,587. Clamps and grippers for printing machines. GESTETNER Ltd. 6 Oct., 1967 [20 Oct., 1966], No. 47044/66. Heading B6C. [Also in Division E2] A clamp for clamping a member 10 on a polygonal cross-sectioned bar 1, comprises two clamping parts 6, 19, the first one 6 of said parts having a polygonal hole 16 therethrough of a crosssection similar to that of the polygonal bar on which the clamp is designed to be used, but providing slight play, and the second of said parts having therethrough a hole 23 larger than that of the first clamping part, but having projecting into such hole a plurality of projections 24 providing wedging surfaces positioned and angled so that rotation of the hole relatively to the bar when the second clamping part is fitted thereon will, in one direction cause the wedging surfaces to tighten on the bar and, in the opposite direction, release such surfaces from the bar, the two clamping parts being constructed to be superimposable one on the other with their holes registering, the clamp additionally comprising resilient means 25 fitting between the two parts and arranged so that, when the two parts are mounted on the bar, the resilient means tends to urge the second clamping part relatively to the first clamping part in a direction about the axis of the bar such as to tighten said wedging surfaces against the bar. In the construction shown the clamp is part of a twin cylinder stencil duplicating machine the bar 1 being a stripper carrying bar which extends transversely across the machine on the delivery side thereof and adjacent the lower cylinder of the machine. The bar 1 is mounted at its end in side plates 3 and 4 of the machine and two of the clamps according to the invention are carried by the bar. The first part 6 includes a substantially cylindrical body 7 from the centre of one part of the circumference of which outwardly projects a bracket 8 of substantially truncated triangular shape, the bracket remote from the body being extended to provide lugs 9 to which the member 10, which is a stripper blade, is secured by screws 11 passing through the lugs 9. Also projecting outwardly from the body 7 is a lug 13 of the same axial length as the body said lug being bent through a right angle near its free end so that the lug defines the base on one side of an upwardly opening channel adjacent the body 7. A square cross-section stub 15 projects from the base of the channel and locates the resilient means which, as shown is a coil spring, the free end portion of the spring bearing on a web 20 of the second part 19. The web 20 extends over the open top of the channel in the first clamping part 6 and has two side cheeks 21 adapted to fit over the ends of the channel, each side cheek being extended at one side by a substantially circular side piece 22 so that the second part 19 embraces the body 7 of the first clamping part. Each of the side pieces has a said bore 23 with the projections 24 providing the wedging surfaces.</p> |
