1、BRITISH STANDARD BS5550-2.9.3: 1980 Incorporating Amendment No.1 Cinematography Part2:16mm film Section2.9 Projector spools Subsection2.9.3 Specification for16mm film spools of732m capacity(43cm size) for specialized equipmentBS5550-2.9.3:1980 This British Standard, having been approved by the Cinem
2、atographStandards Committee andendorsed bytheChairmanofthe Engineering Divisional Council,was published undertheauthority of theGeneralCouncil on 17September1964 as BS3801 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference CMS/28 Draft for comment AA(CME
3、)6291 ISBN 0 580 35692 2 Co-operating organizations The Cinematograph Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Cinematograph, Tele
4、vision and Allied Technicians Board of Trade British Broadcasting Corporation* British Film Institute* British Film Producers Association British Kinematograph Society* Cinematograph Exhibitors Association of Great Britain and Ireland* Federation of British Film Makers Federation of Specialised Film
5、 Associations Home Office Illuminating Engineering Society Incorporated Association of Kinematograph Manufacturers Ltd.* Independent Television Companies Association* Kinematograph Renters Society* Ministry of Defence, Army Department* Royal Photographic Society* The Government department and scient
6、ific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Army Kinema Corporation British Photographic Manufacturers Association Educational Foundation
7、for Visual Aids Electric Lamp Industry Council Federation of Film Societies Film Laboratory Association Institute of Amateur Cinematographers Ministry of Defence, Navy Department Photographic Dealers Association Royal Naval Film Corporation Amendments issued since publication Amd. No. Date of issue
8、Comments 2833 September 1980 Indicated by a sideline in the marginBS5550-2.9.3:1980 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 General construction 1 3 Dimensions 1 4 Spindle mounting and drive 1 5 Clamping face 1 6 Film attachment 1 7 Finger ho
9、les and lightening holes 1 8 Lateral run-out 1 9 Finish 1 10 Running balance 1 11 Weight 1 Appendix A Approximate metric equivalents 4 Figure 1 16mm film spool of2400ft capacity 3 Figure 2 Details of bore and driving slot 3 Table 1 Dimensions of spools for16mm cinematograph film,2400ft capacity 2 Pu
10、blications referred to Inside back coverBS5550-2.9.3:1980 ii BSI 11-1999 Foreword This British Standard has been prepared under the authority of the Cinematograph Standards Committee at the joint request of the British Broadcasting Corporation and the Independent Television Companies Association. 16
11、mm spools for normal use on projectors are dealt with in BS5550-2.9.1 and BS5550-2.9.2 “Spools for16mm motion-picture projectors.” This present standard relates to a spool of larger capacity and more robust construction than the usual projector spool, and is intended for use on television or other s
12、pecialized16mm film equipment. The dimensions adopted for the outside diameter and the core diameter of the spool are such as to accommodate the nominal length of film whether black and white, colour, or coated or striped for magnetic sound reproduction. The spindle mounting and drive are dimensiona
13、lly identical with those specified in BS5550-2.9.2 for normal projector spools, but the clamping face is of larger diameter. As in BS2014, care has been taken to avoid any unnecessary restriction to freedom of design, and provision has been made for the required strength in establishing the dimensio
14、ns of the spools. NOTEWhere metric equivalents are stated the figures in British units are to be regarded as the standard. The metric conversions are approximate. More accurate conversions should be based on the tables in BS350, “Conversion factors and tables”. All British Standards on cinematograph
15、y are eventually to become Sections or Subsections of BS5550 Accordingly this British Standard has been re-numbered as BS5550-2.9.3. BSI Sectional List1, obtainable free from BSI Sales Department, catalogues the British Standards on cinematography. The latest edition or SL1 should be referred to in
16、view of these developments. 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 pa
17、ges This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover 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.BS5
18、550-2.9.3:1980 BSI 11-1999 1 1 Scope This British Standard prescribes the requirements for spools for16mm cinematograph film of2400ft capacity. 2 General construction The flanges shall be of such design and be made of such material as not to crack nor to take a permanent set under normal conditions
19、of use, and the bore shall be capable of withstanding the expected degree of wear. The hub may be of either solid or hollow construction, but shall be so designed as to provide for: a) the spindle mounting and drive specified in Clause4, b) a method of film attachment complying with Clause6, and c)
20、the finger holes specified in Clause7. The flanges shall be firmly and rigidly attached to the hub, so that they will not come apart under normal conditions of use. They shall be so designed as to provide the flat clamping faces specified in Clause5. The flanges may be ribbed, but such ribbing shall
21、 be so designed that there is no continuous concentric groove which would permit a layer of film to move laterally. Ribbing shall not encroach on the clamping face, and the width over the ribbing and over any rolled edge at the periphery of the flange shall not exceed the overall width specified in
22、Table 1. All parts of the spool shall be free from sharp edges. 3 Dimensions The spool shall conform to the dimensions given in Clauses4, 5, 7 and8 and Table 1. 4 Spindle mounting and drive Each flange (or the entire hub, if of solid construction) shall have a square hole and driving slot conforming
23、 to the dimensions given in Figure 2. If the hub is not solid, there shall be an insert so that the driving force is exerted over the full width of the spool and not solely on the flanges. It shall be possible for a square test bar of side0.3155inch(+00.0005) to be passed completely through the bore
24、 of the spool. The driving slots in the two flanges shall be aligned to each other. 5 Clamping face Each flange shall have at its centre a clamping face which shall be free from any projection and shall have a minimum diameter of2 3 / 4 in. 6 Film attachment Effective provision shall be made for sec
25、uring the end of the film, of such a nature as to accept the full width of the film, and such that the film will be freely released at the end of its run. The flanges shall be provided with access holes to furnish comfortable access for securing the film. 7 Finger holes and lightening holes In each
26、flange there shall be at least four finger holes of not less than 3 / 4in diameter at a radial distance of from1 1 / 4in to1 1 / 2in from the centre of the spool. The shape of the finger holes or slots shall be at the discretion of the manufacturer, and one pair of holes may be so shaped as to serve
27、 as the access holes required by Clause6. The flanges may be provided with such lightening holes as the manufacturer may desire. 8 Lateral run-out The flanges shall be free from warping or buckling. Each finished spool shall be tested for true running by being mounted on a true spindle fitted with a
28、 truly normal clamping face,2 1 / 2 inches in diameter,to which the spool is clamped as in service. The spindle shall be square, of0.3155inch(+00.0005) width across flats. When the mounted and clamped spool is rotated, each flange at its periphery shall run true, in a plane perpendicular to the axis
29、 of the spindle, to within a maximum dial indicator reading of 1 / 8in. 9 Finish The spool shall be proof against corrosion under normal conditions of use, and any finish shall not be detrimental to the film. 10 Running balance The finished spool shall provide a satisfactory running-balance. 11 Weig
30、ht The finished spool shall not exceed45ounces in weight. BS 5550-2.9.3:1980 2 BSI 11-1999 Table 1 Dimensions of spools for16mm cinematograph film,2400ft capacity 1 2 3 4 5 6 7 8 9 Nominal size Overall diameter Diameter ofcore Minimum diameter offlat clamping face Width over clamping faces Width bet
31、ween flanges at core Width between flanges at periphery Maximum overall width at any part of the spool Bore A B C D E F G Footage 2400 in 16 7 / 8 0.010 in 4 5 / 8 1 / 32 in 2 3 / 4 a in 0.75 to 0.80 in 0.660 b 0.01 in 0.660+0.05 0.01 in 1 1 / 16 See Figure 2 and Clause4 a The width over the clampin
32、g faces shall be symmetrically disposed with reference to dimension E. b If spring fingers are used to engage the edges of the film, dimension E shall be measured between the fingers when they are pressed outward to the limit of their operating range.BS 5550-2.9.3:1980 BSI 11-1999 3 Figure 1 16mm fi
33、lm spool of2400ft capacity Figure 2 Details of bore and driving slotBS5550-2.9.3:1980 4 BSI 11-1999 Appendix A Approximate metric equivalents The figures in British units are to be regarded as the standard. The following metric conversions are approximate. More accurate conversions should be based o
34、n BS350, “Conversion factors and tables”. inches mm inches mm 0.0005 0.013 1 1 / 16 27.0 0.01 0.25 1 1 / 4 31.8 1 / 32 0.8 1 1 / 2 38.1 0.05 1.3 2 1 / 2 64 1 / 8 3.2 2 3 / 4 70 0.3155 8.014 4 5 / 8 117 0.66 16.8 16 7 / 8 429 0.75( 3 / 4 ) 19.0 0.80 20.3 2400ft=732m 45ounces=1400grammesBS5550-2.9.3:1
35、980 BSI 11-1999 Publications referred to BS350, Conversion factors and tables. BS5550-2.9.1, Dimensions of spools for16mm motion-picture projectors (up to and including120m capacity: 18cm size). BS5550-2.9.2, Spools for16mm motion-picture projectors (from244m to610m capacity: 24cm to38cm size). BS55
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