• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
REWINDING
PROJECTION   LAMPS

Religious Program Specialist 3 & 2, Module 01-Personnel Support
Page Navigation
  327    328    329    330    331  332  333    334    335    336    337  
changing  the  operation  of  the  film  feed  clutch assembly  while  the  drive  system  is  operated  in reverse.  Some  of  the  older  models  require  that the  reels  be  exchanged  on  the  arms  for  re- winding.   That   is,   the   film   on   the   takeup reel  is  placed  on  the  supply  arm  and  the empty  supply  reel  is  moved  to  the  takeup  arm. Check the instructional manual for the projector with  which  you  are  working  to  determine  the steps  for  rewinding  film  on  that  specific  pro- jector. SOUND  AND  SILENT  SPEEDS.—Projec- tors  designed  to  project  both  silent  and  sound films  are  equipped  with  a  silent/sound  selector. Sound film is projected at the rate of 24 frames per  second  (fps),  Silent  film  is  projected  at  the speed of 16 fps in some projectors and 18 fps in others.  When  the  sound/silent  control  lever  is placed  in  the  SILENT  position,  it  rotates  an eccentric*  that  is  attached  to  it,  approximately 180°,  This  slows  down  the  speed  of  the  film. When  the  sound/silent  control  lever  is  in  the SOUND   position, normal   conditions   are restored  and  the  film  moves  at  the  speed  of  24 frames  per  second. PROJECTION   OPTICAL   SYSTEM.—The projection   optical   system,   shown   in   figure 7-16,   consists   of   the   projection   lamp,   a   re- flector,  condensing  lens  assembly,  projection lens,   a   blower   motor shutters. and   cooling   ducts,   and * Eccentric:  A  mechanical  device  consisting  of  a  disk through which a shaft is keyed eccentrically and a circular strap  which  works  freely  round  the  rim  of  the  disk  for communicating  its  motion  to  one  end  of  a  rod.  The  other end  is  constrained  to  move  in  a  straight  line  so  as  to produce  a  reciprocating  motion. 287.29(M1) Figure 7-16.—Projection and sound optical system. 7-28







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.