Handbook for motion picture and stereopticon operators . all projecting machines, no matterwhere made or where used. Reciprocating Table. The perforator built by Mr. Jenkins for punch-ing the marginal rows of little holes in the filmstock by which the ribbon is fed, and which in-sures automatic registration of the pictures, has avibrating table hinged at one end on pin bearings,the other end carrying the tempered steel punch-plate. The table is raised about one-sixteenth ofan inch by a cam pinching the film between thedie-plate and the punch-teeth, which latter arefirmly screwed to the frame.
Handbook for motion picture and stereopticon operators . all projecting machines, no matterwhere made or where used. Reciprocating Table. The perforator built by Mr. Jenkins for punch-ing the marginal rows of little holes in the filmstock by which the ribbon is fed, and which in-sures automatic registration of the pictures, has avibrating table hinged at one end on pin bearings,the other end carrying the tempered steel punch-plate. The table is raised about one-sixteenth ofan inch by a cam pinching the film between thedie-plate and the punch-teeth, which latter arefirmly screwed to the frame. Micrometer adjust-ment of the spacing between the perforations isprovided for by slightly moving the spacingsprocket (by means of knurled head as shown). When the punch-teeth become dull from acci-dent or long-continued use, any expert mechaniccan sharpen them, as follows: Eemove the platehaving the teeth thereon, rest it firmly on a smallanvil or other suitable support and gently upsetthe points with a light smooth-faced hammer. Opeeators Handbook 47. 48 Motion Picture After being sufficiently upset to prevent the teethgoing into the holes without touching on any sidethey are finished on the ends with a smooth filevery carefully held flat. Now replace the punch-plate, touch each tooth with a drop of oil andcarefully and slowly force the teeth into the lowerpunch-plate, which will shear off the edges of theteeth and the punch is ready for use. This, whenproperly and carefully done, will then punch holessmooth and clean. If possible, the frame shouldnever be disturbed, once it is set up. A magnify-ing glass will be of assistance in determining thecondition of the punch-teeth at any time and alsothe character of the punched holes. Rotary Punch. Another punch, having the advantage of maxi-mum rapidit)7 possible consists of a drum or wheelhaving punch-teeth thereon, which step into cor-responding holes in another drum located beneaththe first. The punch-tooth drum is, of course, no
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