US3907416A

US3907416A - Microform positioning apparatus

Info

Publication number: US3907416A
Application number: US489875A
Authority: US
Inventors: Johann E Frank; Klaus W Otten
Original assignee: NCR Corp
Current assignee: NCR Voyix Corp
Priority date: 1974-07-18
Filing date: 1974-07-18
Publication date: 1975-09-23
Anticipated expiration: 1992-09-23
Also published as: DE2531521B2; JPS5112140A; DE2531521A1; CA1026601A; FR2279129A1; DE2531521C3; FR2279129B1; GB1462576A

Abstract

Control mechanism for positioning and for retaining position of a microform carrier in a microform reader. The microform carrier has a plurality or series of projections on one side thereof which cooperate with a pair of rails seatable between the projections, the rails being operable independently of each other to retain the carrier in a desired position. The microform carrier is placed on a reader table which includes slots therein to allow for protrusion of the rails therethrough upon actuation thereof by the operator. One or the other rail may be normally biased to an unactuated or home position for free movement of the microform and its attached carrier in the X or the Y direction to the desired position and, upon positioning the microform, the rails are actuated to lock the microform carrier in place to enable reading of the microform. Alternatively, one or the other rail may be normally biased to an actuated position and control means is then actuated to move one or both rails in a downward direction to permit free movement of the microform carrier to the desired position.

Description

United States Patent [191 Frank et al.

[ Sept. 23, 1975 MICROFORM POSITIONING APPARATUS [75] Inventors: Johann E. Frank, Yellow Springs;

Klaus W. Otten, Xenia, both of Ohio [73] Assignee: NCR Corporation, Dayton, Ohio [22] Filed: July 18, I974 [2l] Appl. No.: 489,875

[52] U.S. Cl. 353/27 [5 l] Int. Cl. G03B 23/08 [58] Field of Search 353/25-27, 353/22, 23, 24

[56] References Cited UNITED STATES- PATENTS 2,335,697 ll/l943 Reymiers 353/27 2,43l,662 11/1947 Ralph 353/27 FOREIGN PATENTS OR APPLICATIONS l02.l38 5/I94l Sweden 353/27 Primary Examiner-Richard E. Aegerter Assistant Examinen-A. J. Mirabito Attorney, Agent, or Firm-J. T. Cavender; Wilbert Hawk. .lr.; George .I. Muckenthaler [57] ABSTRACT Control mechanism for positioning and for retaining posit on of a microform carrier in a microform reader. The microform carrier has a plurality or series of projections on one side thereof which cooperate with a pair of rails seatablc between the projections. the rails being operable independently of each other to retain the carrier in a desired position. The microform carrier is placed on a reader table which includes slots therein to allow for protrusion of the rails therethrough upon actuation thereof by the operator. One or the other rail may be normally biased to an unactuated or home position for free movement of the microform and its attached carrier in the X or the Y direction to the desired position and, upon positioning the microform, the rails are actuated to lock the microform carrier in place to enable reading of the microform, Alternatively, one or the other rail may be normally biased to an actuated position and control means is then actuated to move one or both rails in a downward direction to permit free movement of the microform carrier to the desired position.

20 Claims, 14 Drawing Figures I EIUIL'IEIEIEIDEI so 0 o l lo 0 CI Cl III E C (I O LHb Q Q E! D U o o co b e o c I U u co 05,.) o o 0 U E! l cg.

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[J g Q Q gigllb Q g f l! D I o c) 0 p Q Q C) US Pa ter lt S ept. 23,1975 sl l eet 1 of6 3,907,416

FIG. I

FIG. 2

US Patsnt Sept. 23,1975 Sheet 2 of 6 3,907,416

wv 0m 0m 3 m mm 5 ow m o US Patent Sept. 23,1975 Sheet 3 of6 3,907,416

FIG. l2

US Patent Sept. 23,1975 Sheet 6 of6 3,907,416

FIG.

1 MICROFORM {BOSITIONING APPARATUS BACKGROUND or THE INVENTION In the field of microform readers, there'have been various ways and means of positioning the microform for viewing thereof, the most common being the placing of the microform between a lower glass plate and an upper glass plate with the plates being supported on a carrier which is movable in the X and the'Y directions to the desired position. Of course, the carrier with the plates and the microform is movable in a plane between a light source and a projection lens for projecting the enlarged image onto a screen for viewing thereof.

While the use of such glass plates, both for containing the microform therebetween and for providing a convenient means of positioning the microform in relation to the projection lens assembly, has been an extremely successful concept in the microform reader industry, it is desirable to improve the efficiency of the microform units and at the same time to provide apositioning system which assures retention of the desired microimage in a precise position. t

More recently, positioning concepts have included microform carriers whicheliminate the need for the glass plates and wherein the carrier comprises a flat sheet or plate havinga plurality of projections on the underside thereof, and arranged in columns and rows corresponding to the columns and rows of microimages on the microform. A representative concept of such positioning device is shown and described in a copending application, Ser. No. 347,337, filed Apr.-.2, 1973, entitled Microform Positioning Apparatus, vinventor Heinz Zeutschel, and assigned to the same assignee as the present application. Such co-pending application discloses the use of a simple plate secured to the microform andmovable in X and Y directions and having projections thereoncooperating with a bar or the like on the microform table to retain the microform in position.

- Additional prior'art is shown and described in U.S.

Pat. No. 3,680,952 to F. G. Knowles wherein apparatus.

for handling image bearing mediums includes a platelike carrier slidingly supporting a microfiche, with the carrier and the microforrm viewer-having a plurality of detent elements which cooperate upon incremental receipt and/or withdrawal of the carrier for indicating alignment of an image row of the fiche with the projection system. The fiche carrier has a plurality of spaced recesses, and an insert in the projector housing has a plurality of spring-loaded cavities with a plug member insertable in each cavity to releasably connect the plug member with one of the springs, the effect of which is to provide detent elements to indicate carrier position.

SUMMARY OF THE INVENTION- The present invention relates to microform readers and more particularly to a microform positioning sys-. tem and apparatus therefor wherein a microform carrier of planar shape is securedto a microform having rows and columns of mic'roimages thereon, such carrier including a series of projections on the underside thereof cooperatingwith bar or rail means on a plate or table to position and to retain the position of the microform in a desired location. The microform reader has the surface plate or table positioned between the lightsource and the projection lens assembly for supporting the microform and its carrier, such plate or table including an enlarged aperture near one edge .placed to be in the light -.path for projection thereof.

Forward of the aperture and the surrounding area of the table is a surfacearea'which includes'a pair of X- direction slots and a Y-direction slot arranged in a pattern cooperable' with the microform carrier and adapted to be substantially covered thereby-but having a sufficient surface area to permit movementof-thecarrier over a predetermined"distance; A pair' of X- direction bars or rails arepsitionedin the -X-direction slots and adapted tobe movable'upvand-down' therein and, likewise, a Y-direc'tion bar or--rail is located-in the Y-direction slot for up-and-down'travel therein -and operating within the recesses formed by the projections of the microform carrier. Y 7 5 ln one embodiment of the invention,- such bars -or rails are raised and lowered by means of 'flatted portions of rods or shafts which are rotatable to: engage with supporting members of the bars or rails, the flatt'ed rods or shafts being actuated by lever means readily accessible to the operator. Such lever'means may take a variety of forms, however, it is desirable that when, for instance, the X-direction rail is in a raised position for engaging within recesses in the microformcarrier, thereby locking against movement in the Y-direction, but permitting travel of the carrier in theX-direction, the Y-direction rail is in alowered position to permit such X-direction travel-of the microform carrier. Independent levers are provided in this embodiment for separate actuation of the rails, however the levers may be connected in a manner to insure that the X-directionrails are raised when the -Y-direction rail is lowered, and vice versa, to permit movement of the microform carrier without interference in one or the other direction.

Another embodiment of the invention-uis similar in design but employs spring loading on the bars or rails so that both X-direction and Y-directionirails'are normally biased in the raised .condition to lock the microform carrier in the desired'position. Upon actuation of one lever, the X-dire'ction railis lowered to permit free travel of the carrier in the-Y-dir'ection and,'likewise,- actuation of the other lever lowers the Y-direction rail to permit travel of the carrier. in the X-direction. 'Additionally, both levers may be actuated at any one time to permit rapid travel or movement of the'microform carrier across the table when desired. In this respect the spring loading on the barsor rails retainsthe carrier and its .microform in position-to permit the operator freedom for other operations whenviewingaprojection of the microimage.

In line with the above discussion, the principal object of the present invention is to provide microform positioning apparatus which eliminates the need for the.

transparent commonly used microform containing glass plates.

Another object of the presentinvention is to provide microform positioning apparatus for controlling travel or movement of the microform carrierin a simple operation.

An additional object of.the present invention is to positioning and retaining position of the microform in desired locations.

Additional advantages and features of the present invention will become apparent and fully understood from a reading of the following detailed description taken together-with the annexed drawings, in which:

FIG. I is a diagrammatic view ofa microform reader incorporating one embodiment of the subject matter of the present invention;

FIG. 2 is a plan view of the microform positioning apparatus taken on the line 22 of FIG. I;

FIG. 3 is an enlarged plan view of the microform positioning apparatus shown in FIG. 2;

FIG. 4 is a plan view of the reverse or under side of the microform positioning apparatus shown in FIG. 3;

FIG. 5, on the sheet with FIG. 3, is a sectional view taken on the line 55 of FIG. 3;

FIG. 6, on the sheet with FIG. 3, is a sectional view taken on the line 66 of FIG. 3;

FIG. 7, on the sheet with FIG. 3, is a sectional view taken on the line 77 of FIG. 3;

FIG. 8 is a sectional view takenon the line 88 of FIG. 3',

FIG. 9 is a plan view, similar to FIG. 3, and showing another embodiment of the microform positioning apparatus;

FIG. 10 is a plan view of the reverse or under side of the positioning apparatus shown in FIG. 9;

FIG. II is a sectional view taken on the line 11-11 of FIG. 9;

FIG. I2 is a sectional view taken on the line l2l2 of FIG. 9;

FIG. 13 is a sectional view taken on the line 13-13 of FIG. 9; and

FIG. 14 is a sectional view taken on the line l4l4 of FIG. 9.

Referring now to FIG. I, which shows in diagrammatic form a side elevation of a microform reader incorporating the microform positioning and retaining apparatus of the present invention, a base 10 supports an enclosure I2 containing mirrors I4 and 16 for projecting an image onto a screen I8. The base 10 has a top or table 20 under which is disposed at light source 21, a concave reflector 22, and a condensing lens system 24 for directing the light beam through an opening or aperture 26 in a plate or platform member 28 carried on the table 20. The light beam is directed through a projection lens assembly 30 suitably supported from the enclosure 12 and which lens assembly generally rides on the surface of the plate 28, or slightly above the surface when a microform is placed in the reader. it being sufficient to say that the projection lens is spring-loaded so as to provide a slight downward force on the microform and thereby maintain the lens in proper focus. As is well known, the light beam picks up the microimage and the projection of the image is directed to the mirrors l4 and 16 for deflection of such image onto the screen 18 for viewing or reading by the operator.

The microform positioner of the present invention includes several portions, one of which is a carrier for the microimages, and in the preferred case, is in the form of a card or fiche inserted in an envelope (to be more fully explained) attached to a positioning portion, in turn, secured to a handle portion. In FIG. 2 is shown a plan view of the positioning apparatus with the microfiche 34 containing microimages 35 thereon and ar ranged in columns and rows in a well-known manner. Adjacent the microfiche 34 is the positioning portion in the form of a carrier member 36 having adhered thereto on one side thereof a formation of papillarylike embossed projections 37, such projections being arranged in columns and rows corresponding to the columns and rows of the microimages 35. A handle portion 38 of the positioning apparatus is secured to the carrier member 36 to enable moving of the positioning portion and of the microfiche to various desired locations. The particular construction of the microfiche positioning apparatus is more fully shown and described in the heretofore mentioned co-pending application Ser. No. 347,337, filed Apr. 2, I973.

The plate or platform member 28 is secured in position on the base 10 of the reader so that the aperture 26 in the plate 28 allows the path of light from lamp 21 to project through the lens assembly 30 and to be deflected from the

mirrors

14 and 16 to the screen 18. An operating portion 40 of the microfiche positioning apparatus is shown in the enlarged plan view in FIG. 3, such portion being attached to or a part of the plate 28 and extending on a plane therewith toward the reader operator, who is stationed normally at the right of FIG. 2. The positioning portion of plate member 40 carries mechanism for engaging with the projections 37 of member 36 for purposes of positioning and maintaining position of the member 36 and the microform carrier 34 in the desired locations. While the member 40 is shown and described as a portion separate from the plate 28, these parts could be fabricated as one to provide a planar surface for the microform 34 and its carrier 36. Such mechanism includes a pair of U-shaped or channel-shaped

members

44 and 46, FIGS. 3, 4, 6, and 7, connected to the member 40 by means of

springloaded screws

48 and 50, each of the

members

44, 46 having a flat portion being disposed in tandem in the X direction and the

members

44, 46 including

upright legs

52, 53, 54, and 55, the

legs

52 and 53 being seated in

recesses

56 and 57 in the member 40 and the

legs

54 and 55 extending into

elongated slots

58 and 59 in the member 40. A third U-shaped or channel-shaped member 60 is connected to the member 40 by means of a spring-loaded screw 62, FIG. 6, the member 60 having a flat portion disposed in the Y direction and including

upright legs

64 and 66, the leg 64 being seated in a recess 68 in member 40, as best seen in FIG. 4, and the leg 66 extending into an elongated slot 70 in the member 40. It should be here repeated that FIG. 4 is a view of the under side of the portion 40 to better show the mechanism as being described. It is thus seen that in the case of each of the

members

44, 46, and 60, the seating of the

legs

52 and 53 in their

respective recesses

56 and 57, the seating of the leg 64 in recess 68, and the biasing of the

screws

48, 50, and 62 provides, in effect, a pivotal action for the

members

44, 46, and 60 to thereby permit up-and-down movement of the

legs

54 and 55 through the

slots

58 and 59, and such movement of the leg 66 through slot 70.

A rod or round bar (FIGS. 3, 6, 7 and 8) is disposed adjacent the

legs

54 and 55 of the

members

44 and 46 and parallel therewith, such bar being journaled at the ends thereof for limited rotation by means to be described. The bar is positioned with respect to the

members

44 and 46 so as to be engageable with the flat portion of such members, as best seen in FIG. 7, however, the bar 75 also includes flatted surfaces 76 and 78 (FIG. 3) for a distance therealong for operation to permit the flat portion of the

members

44 and 46 to pivot slightly and to permit the

legs

54 and 55 to move upwardly through the

slots

58 and 59. Near the center of the bar 75 is a flatted surface 80 of limited dimension which engages with a portion of the leg 66 of member 60, the leg'having a cutout therein for seating by such flatted surface 80. It is seen that the surface 80 is rotated at a right angle from the surfaces 76 and 78 to provide actuation of either the

X direction members

44 and 46 or the Y direction member 60 at different times upon rotation of the bar 75.

The member 40 also carries means for rotating the bar 75 to enable the maintaining of position of the microfiche carrier in either the X or the Y direction at any one time. A pair of actuating members in the nature of rectangular plates 85 and 86 (FIGS. 3 and 4) are pivotally connected by means of

screws

88 and 90 to the forward corners of the member 40, the plates having downwardly turned portions 92 and 94 (FIG. 5) which act as handles for the operator to use in operating the positioning mechanism. A link 96 pivoted on a pin 98 connects the

plates

85 and 86 in a lost-motion arrangement wherein an ear I00 of the link 96 is connected by a pin I02 riding in a slot 104 in the ear I00, and an ear 106 of the link 96 is connected by a pin 108 riding in a slot 110 in the ear 106. It is thus seen that the link 96 and the lost-motion arrangement permit an alternating fore-and-aft movement of the two actuating

members

92, 94 so that when one member 94 is in the forward position, as seen in FIG. 3, the other member 92 is in the retracted position.

An arm I12 (FIGS. 3 and 4) extends from the rod 75 near the center thereof and a wire 114 is connected to the arm I12 and to an attachment block I16 secured to portion 94 of the plate 86. When the

handles

92 and 94 are operated in a fore-and-aft direction, the rod 75 is rotated to bear against the respective parts of the

members

44, 46, and 60. For example, with the left handle 94 placed in the position as shown in FIG. 3, the wire 114 has moved the arm I12 and the rod 75 to a position wherein the diametral surface of the rod is engaged against the

members

44, 46 thereby moving the

legs

54, 55 downwardly below the top surface of the plate 40 and biasing the spring on screw 48, as best seen in FIG. 7. At the same time, an edge of the slot in the leg 66 is engaged with the flatted surface 80 of the rod 75 to permit the leg 66 to protrude above the surface of the member 40, as seen in FIG. 6. In this respect, the

X direction legs

54 and 55 are below the surface of the member 40 and the Y direction leg 66 is above such surface, the leg 66 being in position between two columns of the projections 37, as seen in FIG. 2, and permitting sliding movement of the microfiche and its carrier in the Y or fore-and-aft direction.

When the left handle 94, along with plate 86, are moved forward or to the left in FIG. 2, the right handle 92 and plate 85 are moved outward or to the right by reason of the link 96 connecting the two members, such movement causing rotation of the rod 75 to cause the diametral surface of the rod, rather than the flatted surface thereof, to be engaged with an edge of the slot in the leg 66 and to lower such leg below the surface of the member 40, while simultaneously permitting the

legs

54 and 55 to move upwardly in the

slots

58 and 59 and protrude above the surface of member 40. In this respect. the Y direction leg 66 is below such surface and the

X direction legs

54, 55 are above this surface and positioned between two rows of projections 37, as seen in FIG. 2, thereby permitting sliding movement of the microfiche and its carrier in the X or side-to-side direction.

It is thus seen that the microfiche and its carrier are positionedand maintained in position along either the X or the Y direction by means of the mechanism as just described. .With the microfiche and its carrier in position on the surface of the

plates

28 and 40, the engagement of the

legs

54 and 55 with the projections 37 permits manual movement of the microfiche and carrier in the X direction while maintaining these parts in the Y direction, and engagement of the leg 66 with the projections 37 permits manual movement of the microfiche and carrier in the Y direction while maintaining the parts in the X direction. The alternating motion of the

members

92 and 94 provides for simultaneously changing the protrusion of the

legs

54, 55, (or leg 66, as the case may be) to permit movement of the carrier 36 in one direction while maintaining its position in the other direction.

Referring now to FIGS. 9 and I0 of the drawings, a modification of the structure of the present invention includes a flat member I20 in the form of a table or plate for supporting the microfiche 34 and its carrying or positioning plate 36, FIG. 9 showing a plan view of the structure and FIG. 10 showing the under or reverse side of the member and the associated parts. The mechanism has a flat rectangular member 122 having an upturned edge 124 and an upturned edge I26 ori ented in the X direction and projecting through elongated slots I28 and I30, respectively, in the member 120 (FIG. 12), the member 122 being attached to the member 120 by means of ears at

points

132 and 134, but allowing such member 122 to be pivotally operated a slightamount at such points. A second flat member 136 is disposed in the Y direction and has an upturned edge I38 projecting through an elongated slot 140 in the member 120 (see also FIG. II), the member 136 being attached to the member 120 by cars I42 and I44 at pivot points to permit slight pivoting of the member 136. Means for biasing the members 122 and I36 in the upward direction so as to expose the upturned edges 124, I26 and 138 above the top surface of the member 120 is provided by coiled springs I46, I48, and (FIGS. 9 and 10) having end portions 152, I54, and 156 engaging with the lower side of the

members

122 and 136, shown in FIGS. 13 and 14, thereby continually maintaining the edges in position for engaging the projections 37 of the microfiche carrier 36.

One or both of the

members

122, 136 with the upturned edges I24, I26 and 138 may be moved by pivotal action thereof to a position where the edges are below the top surface of the plate 120, the movement being actuated by mechanism including a round bar or rod 158 for the X direction member 122, journaled at 160 and 162 (FIGS. 9 and 12), and a shorter round bar or rod 164 for the Y direction member 136, and journaled at 166, (FIG. 14). The rod 158 includes flatted

portions

168 and 170 engageable with blocks 172 and 174 (FIG. 12) secured to the member 122 on the underside thereof by means of screws 176 (FIG. 10).

Means for rotating the rod 158 and the rod 166 is accomplished by operator-actuated

levers

178 and 180, respectively, (FIGS. 9, l0 and 11) there being a wire 182 connecting the lever 178 and a stem 184 secured to the rod 158, and a wire 186 connecting the lever 180 and a stem 188 secured to the rod 164. The lever 178 is pivotally connected at screw 190 to the plate 120, and the lever 180 is pivotally connected at screw 192 to the plate 120 so that actuation of the

levers

178, 180 by the operator moves the end portion thereof rearward to rotate the

rods

158 and 164 and thereby depress the

upstanding edges

124, 126.. 138 of the

members

122 and 136 below the surface of the plate 120 to permit movement of the microfiche thereacross.

As mentioned above, the

springs

146, 148, and 150 maintain the

edges

124, 126 and 138 in a position above the surface of the plate 120 so that in the normal position of the

levers

178 and 180, as shown in FIGS. 9 and 10, the microfiche 34 and the carrier or holder 36 are retained by the engagement of the

edge portions

124, 126, 138 between the projections 37 of the carrier 36. When it is desired to move the microfiche in the X direction, the lever 180 is depressed inwardly to rotate the rod 164 and urge the edge 138 downwardly by reason of rotation of the rod 164 from engagement with the slot in upturned edge portion 138 from the flatted to the round portion of the rod, thereby removing any obstruction in the path of the projections 37. Likewise, when it is desired to move the microfiche in the Y direction, the lever 178 is depressed inwardly to rotate the rod 158 and urge the

edges

124 and 126 downwardly by reason of rotation of the rod 158 from engagement with the

blocks

172, 174 from the flatted to the round portion of the rod, thereby removing any obstruction in the path of the projections 37. Additionally, the

edge portions

124, 126, 138 may be lowered by depressing both

levers

178 and 180 at the same time so that the microfiche can be freely moved in any direction across the plate 120.

It is thus seen that herein shown and described is a positioning apparatus for use with a microfiche carrier or holder that is normally movable about the surface of the plate and manually operable to release the retaining edge portions of the apparatus to permit free movement of the microfiche in either the X or the Y direction or in both directions upon actuation of both levers of the apparatus. Such apparatus enables the accomplishment of the objects and advantages mentioned above. and while two embodiments of the invention have been disclosed herein, certain other variations may occur to those skilled in the art. It is contemplated that all such variations, not departing from the spirit and scope of the invention hereof, are to be construed in accordance with the following claims.

What is claimed is:

1. Apparatus for positioning a microform in a microform reader, comprising a platform member, a carrier secured to the microform and having a plurality of projections in matrix arrangement thereon, and means including elongated members disposed in normal relationship and operably associated with said platform member for selectively engaging with the projections of said carrier in X and Y direction and retaining said carrier thereat upon movement of said microform to a desired position.

2. The apparatus of claim 1 including manipulative means for selective engagement of said engaging means with said carrier projections.

3. The apparatus of claim 1 wherein said engaging means includes a pair of elongated members operably movable into and out of engagement with said carrier projections.

4. The apparatus of claim 1 wherein said engaging means includes a pair of plate members having edge portions operably movable into and out of engagement with said carrier projections.

5. The apparatus of claim 3 wherein at least one of said elongated members is normally positioned for engaging with said carrier projections, and manipulative means is provided for selectively moving said one elon gated member to a disengaged position with respect to said carrier projections.

6. The apparatus of claim 3 wherein at least one of said elongated members is normally positioned in a carrier projection non-engaging position, and manipulative means is provided for selectively removing said one member from said non-engaging position to an engaging position with respect to said carrier projections.

7. The apparatus of claim 3 wherein one of said elongated members is normally positioned for engaging with said carrier projections and the other of said elongated members is positioned for non-engagement therewith, and manipulative means is provided for selectively reversing the position of each of said elongated members.

8. The apparatus of claim 3 including means rotatable for moving said elongated members into and out of engagement with said projections, and manipulative means is provided for controlling rotation of said moving means.

9. The apparatus of claim 8 wherein said moving means includes a rotatable rod member having a diametral portion for causing engagement of said engaging means with said projections and includes flatted portions for permitting disengagement therefrom during rotation thereof.

10. The apparatus of claim 3 wherein one of said elongated members is disposed in the X direction and the other is disposed in the Y direction, one of said elongated members is normally positioned in a carrier projection non-engaging position. and manipulative means is provided for selectively removing said one member from said non-engaging position to an engaging position with respect to said carrier projections.

11. The apparatus of claim 4 wherein one of said edge portions is normally positioned for engaging with said carrier projections and the other edge portion is normally positioned for non-engagement therewith, and manipulative means is provided for selectively reversing the position of each of said edge portions.

12. The apparatus of claim 3 wherein one of said elongated members is normally positioned for engaging with said carrier projections and the other elongated member is normally positioned for non-engagement therewith, said apparatus including means rotatable for reversing said elongated members with respect to said projections, and manipulative means is provided for controlling rotation of said reversing means.

13. In a microform reader. means for positioning a microform in a desired position and retaining same thereat. said means comprising a carrier secured to said microform and having a plurality of projections on one side thereof, a plate member for supporting said carrier and defining an elongated slot therein, a

pivot member operably associated with said plate member and compatible with said slot for operating therethrough, and means for actuating said pivot member thereby causing movement thereof through said slot and engagement of said pivot member with said projections.

14. In the reader of claim 13 wherein said pivot member comprises a plate having an edge portion for movement through said slot and engageable with said projections.

15. In the reader of claim I3 including means rotatable for causing engagement of said pivot member with said projections.

I6. In the reader of claim 13 including a pair of slots in said plate member and a pair of elongated members perpendicularly disposed to one another and operably movable through said slots for engagement with said projections.

17. In the reader of claim 15 including operatorcontrolled members for actuating said rotatable means.

18. In the reader of claim 15 wherein said rotatable means includes a rod member having diametral portions thereon for causing engagement of said pivot member with said projections and includes flatted portions thereon for permitting disengagement therefrom.

19. In the reader of claim 17 wherein said operatorcontrolled members include a connection therebetween for permitting alternate operation of said rotatble means.

20. In the reader of claim 17 wherein said operatorcontrolled members include a connection therebetween for permitting simultaneous operation of said rotatable means.

Claims

5. The apparatus of claim 3 wherein at least one of said elongated members is normally positioned for engaging with said carrier projections, and manipulative means is provided for selectively moving said one elongated member to a disengaged position with respect to said carrier projections.

10. The apparatus of claim 3 wherein one of said elongated members is disposed in the X direction and the other is disposed in the Y direction, one of said elongated members is normally positioned in a carrier projection non-engaging position, and manipulative means is provided for selectively removing said one member from said non-engaging position to an engaging position with respect to said carrier projections.

13. In a microform reader, means for positioning a microform in a desired position and retaining same thereat, said means comprising a carrier secured to said microform and having a plurality of projections on one side thereof, a plate member for supporting said carrier and defining an elongated slot therein, a pivot member operably associated with said plate member and compatible with said slot for operating therethrough, and means for actuating said pivot member thereby causing movement thereof through said slot and engagement of said pivot member with said projections.

15. In the reader of claim 13 including means rotatable for causing engagement of said pivot member with said projections.

16. In the reader of claim 13 including a pair of slots in said plate member and a pair of elongated members perpendicularly disposed to one another and operably movable through said slots for engagement with said projections.

17. In the reader of claim 15 including operator-controlled members for actuating said rotatable means.

19. In the reader of claim 17 wherein said operator-controlled members include a connection therebetween for permitting alternate operation of said rotatble means.

20. In the reader of claim 17 wherein said operator-controlled members include a connection therebetween for permitting simultaneous operation of said rotatable means.