ISO-6896-1984.pdf
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1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDiZATlON.MEIKAYHAPOflHAR OPI-AHM3ALWlR f-IO CTAHAAPTM3AL4MM.ORGANlSATlON INTERNATIONALE DE NORMALISATION Cinematography - Intermittent sprockets for 35 mm motion-picture projectors - Dimensions Cirkmatographie - Dkbiteur intermittent pour
2、projecteur cinkma tographique 35 mm - Dimensions First edition - 1984-12-15 UDC 778.553.1 Ref. No. IS0 6896-1984 E) Descriptors : cinematography, motion-picture film 35 mm, motion-picture projector, intermittent sprockets, dimensions, definitions. Price based on 4 pages Copyright International Organ
3、ization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:13:59 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a world
4、wide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on t
5、hat committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by t
6、he IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6996 was prepared by Technical Committee ISO/TC 36, Cinema tograph y. 0 International Organization for Standardization, 1984 Printed in Switzer
7、land Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:13:59 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 6896-1984 (E) C
8、inematography - Intermittent sprockets for 35 mm motion-picture projectors - Dimensions 1 Scope and field of application This International Standard specifies the dimensions of two types of 16-tooth intermittent sprockets for 35 mm motion- picture projectors. This International Standard is applicabl
9、e to sprockets used in conjunction with film perforated in ac- cordance with IS0 491. 2 Reference IS0 491, Cinematography - 35 mm motion-picture film and magnetic film - Cutting and perforating dimensions. 3 Definition For the purpose of this International Standard the following definition applies.
10、intermittent sprocket: A feed sprocket used to advance the film periodically (frame-by-frame), NOTE - The sprocket is usually completely at rest during the intervals between advances. It is normally heavily loaded during a portion of its motion since it has to accelerate the film from zero velocity
11、and achieve an average rate of film advance. The root diameter is usually larger than that of a feed sprocket because of greater perforation distortion. 4 Sprocket tooth types 4.1 Type S is the standard square tooth that is used inter- nationally and known as Type AC sprocket tooth, specified in IS0
12、 491. 4.2 Type R is the round tooth that eliminates sharp corners on film contacting surfaces. 5 Dimensions 5.1 The dimensions shall be as shown in the figure and given in the table. 5.2 The sprocket tooth pitch is measured at the midpoint of 0,15 mm film thickness : (diameter E + 0,15 mm) 71 number
13、 of teeth 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:13:59 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6896-1984 (El See tooth detail
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