BS 5550-3 9 1-1949 Cinematography - 35 mm film - Projector spools - Specification for 35 mm film spools of 610 m capacity (38 cm size) for release prints《电影技术 35 mm胶片 放映机片盘 发行拷贝用61.pdf

1、BRITISH STANDARD BS 5550-3.9.1: 1980 Incorporating Amendment No.1 Cinematography Part3:35mm film Section3.9 Projector spools Subsection3.9.1 Specification for35mm film spools of610m capacity(38cm size) for release prints UDC 778.533.4:77.068.26BS5550-3.9.1:1980 This British Standard, having been app

2、roved by the Cinematograph Standards Committee and endorsed by theChairman of the EngineeringDivisional Council, was published under the authorityof the General Council on3 October1949 as BS1587 BSI12-1999 ISBN 0 580 34063 5 Co-operating organizations The Cinematograph Standards Committee, under who

3、se supervision this British Standard was prepared, consisted of representatives of the following Government departments and scientific and industrial organizations: Associated Photographic Film Manufacturers* Association of Specialised Film Producers* Board of Trade British Film Institute British Fi

4、lm Producers Association* British Kinematograph Society* Cinematograph Exhibitors Association of Gt. Britain and Ireland* Government Cinematograph Adviser Home Office Illuminating Engineering Society Incorporated Association of Kinematograph Manufacturers Ltd.* Kinematograph Renters Society* Ministr

5、y of Education Ministry of Supply Royal Photographic Society 16-mm. Film Exhibitors Guild The scientific and industrial organizations marked with an asterisk in the above list, together with the following, were represented on the committee charged with the preparation of this British Standard: Assoc

6、iation of Film Laboratory Employers British Railways Kinematograph Projectionists and Engineers Association Individual Manufacturers Amendments issued since publication Amd. No. Date of issue Comments 2942 September 1980 Indicated by a sideline in the marginBS5550-3.9.1:1980 BSI 12-1999 i Contents P

7、age Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Dimensions 1 3 Hub 1 4 Flanges 1 5 Finish 1 6 Running-balance 2 Figure 1 Spools for2,000ft.,35-mm. cinematograph release prints 3BS5550-3.9.1:1980 ii BSI 12-1999 Foreword BS1587, published in1949, was complementary to BS1492:1

8、948 “35mm cinematograph release prints in2000ft lengths”. BS1492 was revised in1970 and again in1978 when it became BS5550-5.5.2, to deal only with leaders and run-out trailers. Since BS1587 was published, spools of larger capacity have come into common use. These are under study within Technical Co

9、mmittee36 of the International Organization for Standardization (ISO). BS1587 was confirmed in1978 and, as all British Standards on cinematography are to become Sections or Subsections of BS5550, it has been renumbered as BS5550-3.9.1. It should be noted that spools that are in accordance with this

10、specification cannot be used on12.7mm( 1 / 2 in) diameter spindles used for some of the larger capacity spools. Only one type of spool has been specified, which may be used for either transit or projection. It is realized that it may not always be possible to meet the provisions of this standard as

11、soon as it is published; the primary purpose of the standard is to provide a basis for future design. At present only spools with metal flanges have been specified, but this standard will be extended, or supplemented, if it becomes desirable in the future to take into account the use of other materi

12、als. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document compr

13、ises a front cover, an inside front cover, pagesi andii, pages1 to3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5550-3.9.1:1980 BSI 12-1999 1 1 Scope This Bri

14、tish Standard prescribes the requirements for spools with metal flanges, to take standard2,000ft.35-mm. cinematograph release prints and accommodate the maximum permissible length of2,050ft. of film. The standard specifies dimensions, essential points of construction, accuracy of assembly, the mater

15、ials to be used, and the finish required. The standard also provides for the need to earth the spool and film to permit discharge of any static electricity that may accumulate during use. 2 Dimensions a) The spool shall have an outside flange diameter of14 3 / 4in. to15in., and a hub diameter of4 1

16、/ 2in. to5in. b) The interval width between flanges, measured at the periphery of the hub, shall be1 1 / 2 in.+ 1 / 32 in.0in. c) The overall width of the spool, at any point, shall not exceed2in. d) The internal diameter of the centre bushing shall be0.377in.+0.002in.0in. 3 Hub a) The hub may be of

17、 any suitable material or construction; the bore shall be of a suitable bearing material. b) Provision shall be made for securing the end of the film by means of a slit or slits cut across the full width of the hub parallel with its axis. The slits shall have a minimum depth or clearance of 1 / 2 in

18、. and shall be approximately 1 / 16 in. wide. c) The hub shall be designed so that a driving-pin can be inserted through each of the holes specified in Clause4 d) and the fingers of an operator can project through the finger-holes specified in Clause4 e). d) If the hub is made of an electrical insul

19、ating material, provision shall be made for each flange to make an electrical connection with the spindle, when in use. e) It is recommended that the hub should be finished in a distinctive way, preferably in white, to help a projectionist to distinguish the film from the hub, during operation. 4 Fl

20、anges a) The flanges shall be made either: i) Of20I.S.W.G. or thicker steel, with rib-heights and rolled edges of the dimensions given in Figure 1; or ii) Of a non-corrosive alloy or using a different form of construction, provided that the remaining requirements of this standard are met and that th

21、e completed spools are of equivalent rigidity, elasticity and strength to those of spools conforming toi) above and to Figure 1. b) Each flange shall be formed with six radial ribs and six lightening holes. The ribs shall have a sufficient area of flat contact surface to provide adequate bearing sur

22、face for the edges of the film. The lightening holes shall be not less than3in. wide at their widest points and shall expose the film down to the hub. The form of the ribs is optional provided that they comply with the dimensions given in Figure 1. The height of the ribs shall be 1 / 64 in. less tha

23、n the height of the peripheral rolled edge, to allow for stacking. c) The ribbing shall be broken so that there is no continuous concentric grooving which would permit layers of film to move laterally (see Figure 1). d) Four holes shall be provided in each flange, at an angle of90 , to engage with a

24、 driving-pin of 3 / 16 in. maximum diameter at a centre-distance which may be either 7 / 16 in. or 1 / 2 in. from the axis of a 3 / 8 in. spindle and parallel to it. These holes may conveniently take the form of radial slots. e) Four finger-holes not less than 3 / 4 in. in diameter shall be provided

25、 in each flange, at an angle of90 and at a distance of1 1 / 4to1 1 / 2 in. from the centre of the spool. f) Flanges shall be free from warping or buckling and shall run true to within 1 / 16 in. on each flange, when the reel is spun on a 3 / 8 in. shaft. g) The flanges shall be firmly and rigidly at

26、tached to the hub, so that they will not come apart under normal conditions of use. 5 Finish a) The spool shall be free from sharp edges. b) The finish shall protect the spool adequately against corrosion under normal conditions of use. c) The finish shall not prevent the discharge of static electri

27、city from the film to the spindle of the projector or winding machine.BS5550-3.9.1:1980 2 BSI 12-1999 6 Running-balance The spool, when made up, shall provide a satisfactory running-balance. Conversion table in mm 0.002 0.375 0.377 1 / 64 1 / 32 1 / 16 1 / 8 3 / 16 1 / 4 3 / 8 7 / 16 1 / 2 5 / 8 3 /

28、 4 1 0.0508 9.5250 9.5758 0.3969 0.7937 1.5875 3.1750 4.7625 6.3500 9.5250 11.1125 12.7000 15.8750 19.0500 25.4000 ft m 2000 2050 609.60 624.84 I.S.W.G mm 20 0.914BS5550-3.9.1:1980 BSI 12-1999 3 Figure 1 Spools for2,000ft.,35-mm. cinematograph release prints All dimensions in inchesBS 5550-3.9.1: 19

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