(ISO 6896 International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAR OPrAHV3AUWR IO CTAHAAPTW3AUWWORGANISATION INTE RNATIONALE DE NORMALISATION Cinematography - Intermittent sprockets for 35 mm motion-picture projectors -- Dimensions Cinématographie - Débiteur intermittent pour projecteur cinematographique 35 mm -- Dimensions First edition - 1984-12-15 UDC 778.553.1 Ref. No. ISO 6896-1984 (E) iO 6896-1984 Descriptors : cinematography, motion-picture film 35 mm, motion-picture projector, intermittent sprockets, dimensions, definitions. Copyright International Organization for Standardization Price based on 4 pages Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (iSO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that 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 least 75 % approval by the member bodies voting. International Standard ISO 6896 was prepared by Technical Committee ISO/TC 36, Cinematography. International Organization for Standardization, 1984 Printed in Switzerland Not for Resale INTERNATIONAL STANDARD ISO 6896-1984 (E) Cinematography Intermittent sprockets for 35 mm motion-picture projectors -- Dimensions 1 Scope and field of application motion since it has to accelerate the film from zero velocity and achieve an average rate of film advance. The root diameter is usually larger This International Standard specifies the dimensions of two than that of a feed sprocket because of greater perforation distortion. types of 16-tooth intermittent sprockets for 35 mm motion- picture projectors. This International Standard is applicable to Sprocket tooth types sprockets used in conjunction with film perforated in ac- 4 cordance with ISO 491. 4.1 Type S is the standard square tooth that is used inter- nationally and known as Type AC sprocket tooth, specified in 2 Reference ISO 491. ISo 491, Cinematography - 35 mm motion-picture film and 4.2 Type R is the round tooth that eliminates sharp corners magnetic film - Cutting and perforating dimensions. on film contacting surfaces. 5 Dimensions 3 Definition 5.1 The dimensions shall be as shown in the figure and given For the purpose of this International Standard the following definition applies. in the table. 5.2 The sprocket tooth pitch is measured at the midpoint of intermittent sprocket: A feed sprocket used to advance the 0,15 mm film thickness : film periodically (frame-by-frame). (diameter E + 0,15 mm) π NOTE - The sprocket is usually completely at rest during the intervals between advances. It is normally heavily loaded during a portion of its number of teeth Copyright International Organization for Standardization itted without license from IHS Not for Resale