Abstract
In this two-speed drive, adapted to a Bell & Howell Printer, Model D, two motors running continuously drive the fields of two electric clutches in the same direction, one at approximately twice the speed of the other. The armatures of the clutches are on the same shaft and are splined to the hub of a third pulley that drives the printer. An electrical circuit triggered by a cuing system activates one clutch or the other to change the speed of the printer within a short enough interval so that there is no loss in projection quality of the print. Such a speed changer permits optimum productivity on a printer using negatives containing scenes of widely varying densities.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
