US3603520A

US3603520A - Filmstrip takeup

Info

Publication number: US3603520A
Application number: US702432A
Authority: US
Inventors: Robert N Mcfadden
Original assignee: Graflex Inc
Current assignee: Graflex Inc
Priority date: 1968-02-01
Filing date: 1968-02-01
Publication date: 1971-09-07
Anticipated expiration: 1988-09-07
Also published as: GB1211055A

Abstract

An improved filmstrip guide includes an edge abutment surface and an outside guide surface for conforming a filmstrip to the surface of an imaginary cone from which the strip is steered into a coil in an open-ended cylindrical container. The edge abutment surface extends inward from the cone surface and follows a helix on the cone that is a straight line in a development of the cone. The outside guide surface lies on the cone surface next to the edge abutment surface, and both guide surfaces extend about 180* around the cone and terminate near the open end of the container. The cone''s rays generally pass through the space inside the coil, and the cone diameter in the plane of the open end of the coil is less than the inside diameter of the coil.

Description

mite ts i 1 amaze Primary Examiner-Billy S. Taylor fittorneyCumpston, Shaw & Stephens ABSTRACT: An improved filmstrip guide includes an edge abutment surface and an outside guide surface for conforming a filmstrip to the surface of an imaginary cone from which the strip is steered into a coil in an open-ended cylindrical con tainer. The edge abutment surface extends inward from the cone surface and follows a helix on the cone that is a straight line in a development of the cone. The outside guide surface lies on the cone surface next to the'edge abutment surface, and both guide surfaces extend about 180 around the cone and terminate nwr the open end of the container. The cones rays generally pass through the space inside the coil, and the cone diameter in the plane of the open end of the coil is less than the inside diameter of the coil.

PATENTED SEP 71971 swim mulluu-uulaumnn I N VE N TOR. ROBERT IV. MCFADDEA/ HIS ATTORNEY PATENTED SEP H971 SHEET H UF 2 m c fi M mm 270" 5 ELSE; 15: 9:95;, 1 9.11 9:. BAP P; P. P fly UIJUIJIJIJ DUUDEIDUUBDHUUU NIO I N VE N TOR. ROBERT N. MCFADDEA/ HIS ATTORNEY This invention relates to a filmstrip takeup of the type in which a filmstrip is pushed into a coil in an openended, cylindrical container, and more particularly to an improved guide for steering the film accurately into a coiled configuration in the container with minimum resistance.

in prior art film talteups of this general type, a filmstrip was guided around a cylindrical surface on the axis of the desired coil and was made to follow a variable helix, of decreasing pitch as the filmstrip approached the container. The container was generally a rotatable cylinder holding a conventional film can. The leading end of the filmstrip was intended to emerge from the cylindrical guide helix and enter the can, and as the film pressed against the bottom of the can, the interference or back pressure from the can accomplished the final step of conforming the film strip to a cylindrical coil inside the can.

customarily, the instructions for operating such a prior art filmstrip talteup suggested that the can be manually rotated in the direction of the coiling of the filmstrip as the first turn of the coil was being formed to insure that the filmstrip was properly started in its coil. if this was not done, the filmstrip could jam against the bottom of the film can with sufficient force to tear its sprocket holes. Also, such prior art takeups could not be operated withoutthe film can arranged inside the rotatable container to receive the filmstrip coil, and they were not effective in coiling filmstrips with unusual curl conditions. The curling tendencies of filmstrips vary widely with the make and size of film, temperature, humidity, and previous curling experience. Manual intervention in the talteup was often necessary to start the coiling of some filmstrips, and filmstrips with a coil tendency reverse to the normal could even miss the receiving film can completely.

The objects of this invention include, without limitation, overcoming the deficiencies of prior art film talteups of the type described, and guiding a filmstrip into a cylindrical coil in an open'cnded cylindrical container so that:

a. no manual intervention is required;

is. any of a variety of films and film curling tendencies can be accommodated, including either normal or reverse curl;

c. the guiding is smooth, low friction, consistent, and accurate;

d. a minimum of force is needed to push the film into the container;

e. the guide path is short and the guide is compact;

f. the film is not scratched or damaged and has minimum contact with the guide; and

g. the guide is economically manufactured and maintained and is competitive with prior art guides.

These and other objects of the invention will be apparent hereinafter from the specification which describes the invention, its use, operation, and preferred embodiment from the drawings, which constitute a part of the disclosure, and from the subject matter claimed.

Generally, the improved guide for directing a pushed filmstrip into a coiled configuration in an open-ended cylindrical container includes the following features: an edge abutment surface for guiding the edge of the filmstrip, the charactcristics of such edge abutment surface being that it follows a helix on an imaginary conic surface substantially all the rays of which extend through the space inside the coil, that it extends inward from the conic surface, that it is a substantially straight line in a development of the conic surface, that it terminates near the open end of the container; and an outside guide surface adjacent the edge abutment surface and lying approximately on the conic surface for conforming the filmstrip generally to the conic surface. By such an arrangement, the filrnstrip is guided around the conic surface until its leading edge approaches a parallel relation with the axis of the coil and the film is turned to a diameter iess than the inside diameter of the coil. Filmstrips of any curling tendency, when conformed to such an orientation by the inventive guide, are automatically steered with a minimum of resistance into the desired coil. in the Drawings FlG. i is a plan view of the inventive film takeup;

PM]. 2 is an end elevation ofthe film takeup of HG. ll;

H6. 3 is a partially cutaway side elevation of the film takeup of FIG. ll;

FIG. 4 is a partially schematic side sectional view of the filmstrip path for the takeup of HG. i; and

HO. 5 shows a development of the guide surfaces of the film talteup of H6. 1.

The illustrated preferred embodiment of the invention will be described briefly, and then some of the considerations for constructing film guides according to the invention will be explained. Throughout the drawings, corresponding parts have the same reference numbers.

The illustrated film takeup was designed for a projector using a 35-millimeter filmstrip, and some configurations of the takeup are influenced by projector design rather than the essentials of the invention. The inventive takeup can be used for other widths of filmstrip and other photographic equipment. For convenience, the invention will be described relative to the illustrated embodiment, but those skilled in the art will un derstand that other embodiments and arrangements of the inventive takeup are possible.

Filmstrip it) is advanced by sprocket ill into guide ill which bends filmstrip Mi so as to wrap it around the surface of an imaginary cone 2!, the vertex of which is aimed generally into container 13. Container i3 has a hub lid that is rotatably housed in a bearing 15, so that container 13 can rotate freely. A conventional film can 20 can be placed loosely inside con tainer if; for rotation therewith to receive filmstrip it), Filmstrip lltl is coiled in either can 20 or container 13 so that the outermost convolution of the coil is formed by the leading portion of filmstrip MB and successive convolutions are laid inside the preceding outer convolutions as filmstrip it) is taken up. This leaves the leading end of filmstrip it) lying on the outside of the completed coil and ready for reprojection without rewinding.

For some purposes, it is preferred not to rccoil filmstrip it), and container 13 is pivoted aside so that filmstrip it can be led past container 13 and outside the projector. Such an arrangement can be used for continuous loop projection, for example, or for any filmstrip that is too long to coil inside container l3. Container l3 also pivots aside for insertion and removal of film can 20. Such pivoting aside of container ll} is accomplished by a frame Mi supporting bearing 15 and container i3 and pivotally mounted on pin 27. Pivoting of frame to on pin 17 in the direction of the arrow in FIGv ll moves container 13 out of the path of filmstrip it). A latch ridge lid on frame id is arranged to engage a resilient latch means (not shown) on the projector for holding container 13: in a pivotedaside position, and a lever w is arranged for moving container R3 between positions.

The axes of container 113 and imaginary cone 21 are each oblique to the path of filmstrip it? as it leaves sprocket it. Conic surface Trill can be thought of as containing an infinite number of rays each of which is an imaginary line on the sur face of cone M in a plane with the cone axis and extending through the vertex of the cone. All the rays of cone 2ll extend through the space inside the coil which filmstrip it) forms in can 2% and cone 2f is preferably, but not necessarily, a right circular cone. Filmstrip it) is preferably turned on cone 21 to a smaller diameter than the inside diameter of its intended coil, and this is effected by cone 2i having a smaller diameter in the plane of the open end of film can 20 than the coil to be formed by filmstrip it) inside film can 2t).

Guide ll2 has two principal guide surfaces that conform filmstrip lld to the desired conic shape. These guide surfaces are an edge abutment surface 25, and an outside guide surface 26, each of which follow imaginary conic surface 211i.

Edge abutment surface 25 follows a helix on conic surface Eli and extends inwardly from conic surface 23 and outside guide surface 26. Edge abutment surface 25 is a substantially straight line in a development of the imaginary conic surface 21, as shown in FIG. 5. Also, edge abutment surface 25 terminates at its output end in the region of the open end of film can 20.

Outside guide surface 26 lies adjacent edge abutment surface 25 and on the surface of cone 21. Outside guide surface 26 preferably extends past the perforation holes in filmstrip 10 to the edge of the picture area of filmstrip 10, a distance somewhat less than one-quarter of the width of standard filmstrips. Outside guide surface 26 thus preferably forms the top of a raised ledge engaging the perforated margin area of filmstrip 10 which is stiffenough to be conformed to the surface of imaginary cone 21 by such engagement. Restricting outside guide surface 26 to the marginal edge of filmstrip 10 outside the picture area insures that the picture area of filmstrip 10 will not be scratched in passing through guide 12. However, outside guide surface 26 can extend further across filmstrip 10, or all the way across filmstrip 10, if desired.

Surface 27 of guide 12 adjacent outside guide surface 26 is preferably recessed relative to guide surface 26 to lie slightly beyond or outside the surface of imaginary cone 21. Filmstrip l0, and particularly the leading end of filmstrip 10, is restrained by surface 27 from any substantial deviation from the conic configuration to which it is conformed principally by outside guide surface 26. However, in normal operation, filmstrip 10 does not engage surface 27.

An entry guide surface 28 generally opposite guide surface 26 insures that the leading end of filmstrip 10 is directed into engagement with outside guide surface 26 and edge abutment surface 25 and prevents any curling of filmstrip 10 completely away from guide 12. For the same purpose, guide 12 is preferably positioned near sprocket 11.

The terminal or output end of outside guide surface 26 is preferably cutaway or beveled to form a discharge surface 29 extending obliquely outward from the surface of imaginary cone 21. This eliminates any film scratching edge at the output end of guide 12 and allows filmstrip 10 to be guided slightly upward and away from guide 12 when it is not being formed into a coil in can 20.

Guide 12 is preferably molded of a single piece of plastic material and arranged as illustrated relative to container 13.

FIG. shows a development of the imaginary cone 21 to represent edge abutment surface 25 and outside guide surface 26 as rolled out flat in a plane. Edge abutment surface 25 is a straight line in such development, and outside guide surface 26 and discharge surface 29 are clearly shown relative to filmstrip 10.

In operation, the leading end of filmstrip is driven past sprocket 11 and into the input end of guide 12. The guided edge of filmstrip engages outside surface 26 and edge abut ment surface 25 and is bent to conform to the surface of imaginary cone 21. At the output end of guide 12, the leading end of filmstrip 10 is approximately in the position illustrated in broken lines in FIGS. 1 and 3. Depending on the curl of filmstrip 10, its leading end may point upward as shown by the upper broken line position in FIG. 2, or may tend to curl on around the surface of cone 21 as shown by the lower broken line position in FIG. 2. In either case, the leading end of filmstrip 10 is directed into can in a path such that it forms the coil illustrated in FIG. 4 automatically with the least possible resistance. The turning or bending of filmstrip 10 by guide 12 is acute enough to impress a conic shape into filmstrip 10 so that regardless of variations in the curl of filmstrip 10 it is advancedautomatically into the coil shown in FIG. 4.

Several general considerations such as film characteristics, coil siie, etc. affect'the size and shape of guide 12 and its orientation relative to the film path at sprocket 11 and takeup container 13. These general considerations are also influenced by the design requirements of a projector or other photographic equipment using the inventive takeup. Such considerationsi are discussed in the following paragraphs.

Takeup' container 13 is preferably angled obliquely to the path of filmstrip 10 leaving sprocket 11. A takeup container aligned with the filmstrip path would require the filmstrip to be conformed to along, thinly tapered cone with the filmstrip guided almost to the vertex of the cone before entering a coil in the container. A container angled nearly normal to the filmstrip path would require that the filmstrip be conformed to a fairly large diameter cone so that the turned-over, leading end of the filmstrip could clear the edge of the filmstrip opposite the edge being guided. This tends to require either a length guide or a relatively large diameter coil and receiving container. The space available within the photographic equipment to accommodate various oblique container angles relative to the film path, and the space required for pivoting the takeup container aside of the filmstrip, if desired, also effect guide and container angles.

The inside diameter of the film coil to be formed in the takeup container is generally determined by the length of filmstrip to be coiled within a standard size film can. Generally, the guide path should be as short as feasible so that the filmstrip engages the guide for a minimum length of travel. The diameter of the imaginary cone in the plane of the open end of the film can or other container is preferably less than the inside diameter of the coil to be formed so that the innermost convolution of the filmstrip is laid inside such coil without interference. Preferably, the guide is arranged near the coil receiver so that the filmstrip does not make any substantial unguided traverse between the guide and the receiver. Also, the curvature impressed on the filmstrip by the guide is preferably acute enough to insure that any adverse coiling tendencies of the filmstrip are overcome and the filmstrip is faithfully conformed to the surface of the imaginary cone.

At the entry of the guide, the filmstrip can intersect the rays of the guide cone at various oblique angles depending on length of the path of the filmstrip around the cone and the position of the coil-receiving container. As the filmstrip proceeds toward the output end of the guide, the angles between its edges and the cone rays become larger and approach the perpendicular. The optimum transition point for the filmstrip to turn from the conic surface into a cylindrical coil is along the line of the cone ray normal to the edges of the filmstrip. From such a line, the filmstrip can leave the conic surface on a tangent and enter a coil whose axis is parallel with the transition ray without any lateral turning of the film. Whether the film guide surfaces should extend all the way to the transition line depends in part on other parameters and the possibility of optionally leading the filmstrip aside of the container without forming a coil.

With such considerations, variables, and objects in mind, the precise configuration and orientation of guide 12 and container 13 was reached somewhat in the following manner. A 35-millimeter filmstrip, a standard 35-millimeter film can, and a 60 frame length of filmstrip were given. These determined the inside diameter of the coil of filmstrip in can 20 and incidentally allowed a frame length of filmstrip 10 to be coiled to the same inside diameter in container 13. Projector considerations also determined the side of the film path on which container 13 would be obliquely positioned, and decreed that the container be pivotal for leading filmstrip 10 past container 13 without coiling. Also, the normal coil tendency of filmstrip 10 as oriented in the projector determined that the guide 12 should bend the filmstrip upward and over cone 21 toward the right of the film path as illustrated. An approximate turn or halfway traverse around cone 21 then brings filmstrip 10 to the top of cone 21 from whence it can be led sideways out of the projector or guided into the desired coil, so that a 180 turn around cone 21 was selected as optimum for the length of guide 12.

Filmstrip 10 tends to continue in the conic path to which it is conformed by guide 12 after leaving the output end of guide 12, and a further one-fourth turn around cone 21 was selected as the optimum transition point for filmstrip 10 to turn from its conic path to a cylindrical path inside film can 20. Thus, a 270 turn around cone 21 was chosen as the optimum conic transverse for coiling filmstrip 10, and after a 270 turn around cone Jill the square-cut leading end offilmstrip W was arranged to be substantially parallel with the axis of container l3, and the intersected ray of cone Ell. From such a position, filmstrip l can leave cone 2i tangentially and form a cylindrical coil without any lateral turning.

The inside diameter of the coil of Filmstrip 110 in a standard film can give the maximum circumference C of cone Fill in the plane of the open end of the film can so that the innermost convolution of the coil can be guided into the film can without interference.

Edge abutment surface 25 is preferably a straight line in the development of cone 21 so that the edge of filmstrip l0 can follow abutment surface 25 naturally without buckling or distortion.

With these determinations made, the development of guide l2 as shown in P16. 5, is constructed as follows. Since the leading edge of filmstrip l0 is normal to edge abutment surface 215 and preferably parallel with an intersected ray of cone 2i after 270 of turning around cone 211, a ray line 31 is constructed normal to the extension of the line of abutment surface 25 at 270 of cone wrap. One-fourth of circumference C is measured back along the extension of edge abutment sur face 255 to mark the output end of guide l2 at the 180 mark of cone wrap, and line 32 is normal to surface 25 at such point. One-half the circumference C is then measured back from line to determine the desired length of edge abutment surface 33 and outside guide surface 2t, and a line 33 marks the input end of guide l2. Then, the angle between container l3 and the path of film W at sprocket lit, and the desired sharpness of curvature for guide if! determine entry angle E which is constructed at 0 line 33. Line 3 is then extended at angle E to represent a ray of the cone 211 at the entry to guide 12, and the intersection of line 34 with line 311 determines the vertex V of cone 2B. The angle l3 between line 3d and edge abutment surface 25 is the helix angle ofentry defined as the angle between edge abutment surface 25 following the desired helix and the ray intersected at the entry of filmstrip iltll into guide 10;. The helix angle between edge abutment surface 25 and successive rays approaching the output ray 35 is progressively greater. The ray 3ll at the extension of cone Illll to 270 of turn is normal to the helix followed by filmstrip l0 and marks the transition point at which filmstrip 10 can assume a cylindrical coiled configuration without turning from its path. At the 180 mark or output end of guide E2, the leading end of filmstrip l0 approaches a parallel relation with ray 35 and is nearing the transition point.

The 270 transition ray 31 is shown in broken line in FllG. ll to illustrate the preferred relationship of filmstrip 1 .0 to takeup container l3 at such point.

The cone developed in HG. is preferably aimed relative to container if) so that the vertex is near the axis of container l3 and the rays of the cone extend through the inside of the coil formed in can 20. As best shown in FIG. 3, in the illustrated embodiment of the invention a ray lying at the bottom center of cone is approximately tangent to the inside of the coil to be formed in can 20.

For optimum balancing of the various design considerations, it is preferred that entry angle E be more than 30 and preferably about 45. Also, it is preferred that the helix angle between abutment surface 25 and the ray 35 intersected at the output end of guide ll! be less than 30, and preferably less than 20.

Edge abutment surface 25 is preferably normal to the sur face of cone 21, but can be acute or stand inward at some angle other than normal, so long as it provides a firm edge support for filmstrip it).

It will thus be seen that the inventive takeup guide accomplishes the abovestated objects of the invention. Filmstrip can follow edge abutment surface 25 without any buckling or transverse curvature and can be conformed to a conic surface by outside guide surface 2 h with a minimum of friction and with freedom from scratching the picture area of filmstrip l0. Guide l2 is short, smooth, accurate, and capable of conforming a filmstrip of any curling tendency into a conic shape for accurate coiling into a takeup container. No manual intervention is necessary, and the inventive takeup is economical, simple, accurate, and competitive.

Other features, advantages, and other specific embodiments of this invention will be apparent to those exercising ordinary skill in the pertinent art after considering the foregoing disclosure. in this regard, while specific preferred embodiments have been described in detail, such disclosure is intended as il lustrative, rather than limiting, and other embodiments, variations, and modifications can be effected within the spirit and scope of the invention as disclosed and claimed. Furthermore, the following claimed subject matter is intended to cover fully all the aspects of the disclosed invention that are unobvious over prior art, including all equivalent embodiments.

lclaim:

1. In a filmstrip takeup having a generally cylindrical, open end container for receiving said filmstrip in a coiled configuration and means for pushing said filmstrip generally toward said open end of said container, an improved guide for directing said filmstrip into said coiled configuration in said container, said guide comprising:

a. an edge abutment surface for engaging and guiding an edge of said iilmstrip;

1. said edge abutment surface being configured to follow a helix on an imaginary conic surface substantially all the rays of which extend through the space inside said coil;

2. said edge abutment surface extending inward from said conic surface;

3. said edge abutment surface being a substantially straight line in a development of said conic surface;

4. the output end of said edge abutment surface terminating in the region of said open end of said container; and

b. an outside guide surface adjacent said edge abutment surface and formed to lie approximately on said conic surface for conforming said filmstrip generally to said conic surface with an edge of said filmstrip guided by said edge abutment surface.

2. The filmstrip takeup of claim ll wherein the diameter of said conic surface in the plane of said open end of said container is less than the inside diameter of said coil.

3. The filmstrip takeup of claim l wherein a ray of said conic surface is substantially parallel with the axis of said coil and approximately tangent to the inside of said coil.

4. The filmstrip takeup of claim ll wherein said edge abutment surface and said outside guide surface extend approximately around said conic surface.

5. The filmstrip takeup of claim ll including means for pivot ing said container aside from said conic surface, and said out side guide surface is cut away at said output end for leading said filmstrip past said container.

6. The filmstrip takeup of claim it wherein said guide surface is less than onc-fourth of the width of said filmstrip.

'7. The filmstrip takeup of claim ll wherein said guide sur face is substantially as wide as said filmstrip.

ill. The filmstrip takeup of claim 1 wherein a surface adjacent said guide surface is depressed from said conic surface for a major portion of the width of said filmstrip.

9. The filmstrip takeup of claim ll wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at said output end of said guide is less than 30.

W. The filmstrip takeup of claim ll wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at the input end of said guide is more than 30.

ill. The tilmstrip takeup of claim ll wherein the angle of said helix of said abutment surface to a ray of said conic surface intersected at the output end of said guide is less than 20.

E2. The filmstrip takeup of claim l including a surface disposed opposite said outside guide surface for directing the leading end of said films-trip into engagement with said edge abutment surface and said outside guide surface.

13. The filmstrip takeup of claim ll wherein said edge abutmcnt surface is approximately normal to said conic surface.

14. The filmstrip takeup of claim 1 wherein the path of said filmstrip at the input end of said guide is oblique to the axis of said container.

15. The filmstrip takeup of claim 14 wherein said guide surface is less than one-fourth of the width of said filmstrip.

16. The filmstrip takeup of claim 15 wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at said output end of said guide is less than 30.

17. The filmstrip takeup of claim 16 including a surface disposed opposite the outside guide surface for directing the leading end of said filmstrip into engagement with said edge surface intersected at the input end of said guide is more than 30, and the diameter of said conic surface in the plane of said open end of said container is less than the inside diameter of said coil.

19. The filmstrip takeup of claim 18 wherein a ray of said conic surface is substantially parallel with the axis of said coil and approximately tangent to the inside of said coil.

20. The filmstrip takeup of claim 19 wherein said edge abutment surface is approximately normal to said conic surface, and said edge abutment surface and said outside guide surface extend approximately around said conic surface.

21. The filmstrip takeup of claim 20 including means for pivoting said container aside from said conic surface, and said outside guide surface is cutaway at said output end for leading said filmstrip past said container.

Claims

1. In a filmstrip takeup having a generally cylindrical, open end container for receiving said filmstrip in a coiled configuration and means for pushing said filmstrip generally toward said open end of said container, an improved guide for directing said filmstrip into said coiled configuration in said container, said guide comprising: a. an edge abutment surface for engaging and guiding an edge of said filmstrip; 1. said edge abutment surface being configured to follow a helix on an imaginary conic surface substantially all the rays of which extend through the Space inside said coil; 2. said edge abutment surface extending inward from said conic surface; 3. said edge abutment surface being a substantially straight line in a development of said conic surface; 4. the output end of said edge abutment surface terminating in the region of said open end of said container; and b. an outside guide surface adjacent said edge abutment surface and formed to lie approximately on said conic surface for conforming said filmstrip generally to said conic surface with an edge of said filmstrip guided by said edge abutment surface.

2. said edge abutment surface extending inward from said conic surface;

2. The filmstrip takeup of claim 1 wherein the diameter of said conic surface in the plane of said open end of said container is less than the inside diameter of said coil.

3. The filmstrip takeup of claim 1 wherein a ray of said conic surface is substantially parallel with the axis of said coil and approximately tangent to the inside of said coil.

4. the output end of said edge abutment surface terminating in the region of said open end of said container; and b. an outside guide surface adjacent said edge abutment surface and formed to lie approximately on said conic surface for conforming said filmstrip generally to said conic surface with an edge of said filmstrip guided by said edge abutment surface.

4. The filmstrip takeup of claim 1 wherein said edge abutment surface and said outside guide surface extend approximately 180* around said conic surface.

5. The filmstrip takeup of claim 1 including means for pivoting said container aside from said conic surface, and said outside guide surface is cut away at said output end for leading said filmstrip past said container.

6. The filmstrip takeup of claim 1 wherein said guide surface is less than one-fourth of the width of said filmstrip.

7. The filmstrip takeup of claim 1 wherein said guide surface is substantially as wide as said filmstrip.

8. The filmstrip takeup of claim 1 wherein a surface adjacent said guide surface is depressed from said conic surface for a major portion of the width of said filmstrip.

9. The filmstrip takeup of claim 1 wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at said output end of said guide is less than 30*.

10. The filmstrip takeup of claim 1 wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at the input end of said guide is more than 30*.

11. The filmstrip takeup of claim 1 wherein the angle of said helix of said abutment surface to a ray of said conic surface intersected at the output end of said guide is less than 20*.

12. The filmstrip takeup of claim 1 including a surface disposed opposite said outside guide surface for directing the leading end of said filmstrip into engagement with said edge abutment surface and said outside guide surface.

13. The filmstrip takeup of claim 1 wherein said edge abutment surface is approximately normal to said conic surface.

16. The filmstrip takeup of claim 15 wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at said output end of said guide is less than 30*.

17. The filmstrip takeup of claim 16 including a surface disposed opposite the outside guide surface for directing the leading end of said filmstrip into engagement with said edge abutment surface and said outside guide surface.

18. The filmstrip takeup of claim 17 wherein the angle of said helix of said edge abutment surface to a ray of said conic surface intersected at the input end of said guide is more than 30*, and the diameter of said conic surface in the plane of said open end of said container is less than the inside diameter of said coil.

20. The filmstrip takeup of claim 19 wherein said edge abutment surface is approximately normal to said conic surfacE, and said edge abutment surface and said outside guide surface extend approximately 180* around said conic surface.

21. The filmstrip takeup of claim 20 including means for pivoting said container aside from said conic surface, and said outside guide surface is cut away at said output end for leading said filmstrip past said container.