Magnetic reading and/or recording apparatus for use with photosensitive medium

Abstract: A magnetic reading and/or recording apparatus for reading and/or recording information from/on a magnetic information track on a photosensitive medium (12) includes a magnetic reading and/or recording element (14) connected to an edge follower (22) having a variable tracking position.The edge follower tracks a longitudinal edge of a moving photosensitive medium by adjusting with the photosensitive medium responsive to any departures of the photosensitive medium from a defined path to effect a constant orientation of the magnetic reading and/or recording element with respect to the longitudinal edge of the photosensitive medium. The magnetic reading and/or recording apparatus further includes a member (24) supporting the edge follower for movement by a forward leading edge of a photosensitive medium, when the photosensitive medium enters the defined path, from a normal initial position in the defined path to the variable tracking position, to effect a proper relation between the photosensitive medium in the defined path and the edge follower in its variable tracking position.

Description: Cross-Reference to Related Applications Reference is made to commonly assigned copending application EP 92 912 513 entitled MAGNETIC HEAD-TO-RECORDING MEDIUM SUPPORT APPARATUS, [and) filed May 11, 1992. Field of the Invention The present invention relates generally to the field of magnetic reading and/or recording apparatus, and in particular to a device for guiding a web through a magnetic reading and/or recording apparatus. Background of the Invention Proper registration between a magnetic reading and/or recording element and a magnetic information track on a web can be maintained by attaching the magnetic reading and/or recording element to an edge guide which follows a longitudinal edge of the web. The leading end of the web could catch on the edge guide as the web is threaded into a magnetic reading and/or recording apparatus, thus causing the web to rip or wrinkle. This deformation of the web may reduce the accuracy of the information being recorded on or read from the magnetic information track on the web. Published Swiss Patent Specification No.379,915 discloses a mechanism for guiding a strip of motion-picture film past a film window in a projector, in edge of the strip and forces the opposite edge into contact with a stationary guide. Published, commonly assiqned International Patent Application No. WO 91/02292 discloses a simplified suspension system for a magnetic head in which the head is supported for rotation about an axis perpendicular to a longitudinal axis of a filmstrip and for translation along an orthogonal axis transverse to the filmstrip, rotation about and translation along other orthoaonal axis being restrained, what is reflected in the preamble of claim 1. According to the invention, a magnetic reading and/or recording apparatus is provided as claimed in claim 1. Thus, a web can be threaded through a magnetic reading and/or recording apparatus without ripping or wrinkling. Brief Description of the Drawings Other advantages of the invention will become apparent from the following description taken in connection with the accompanying drawing wherein: FIGURE 1 is an exploded view of a magnetic reading and/or recording apparatus in accordance with the present invention; FIGURES 2A, 2B, 2C are plan views of the underside of the apparatus of Figure 1, showing a web entering and traveling through the magnetic reading and/or recording apparatus; and FIGURE 3 is a partial section view of a magnetic reading and/or recording element and its respective backer apparatus. Description of the Preferred Embodiment Referring now to the drawings and in particular to FIGS. 1 and 2, a magnetic reading and/or recording apparatus 16 having a web guiding device 10 for directing a web 12 to a magnetic reading and/or recording element 14 in the magnetic reading and/or recording apparatus 16 is shown. The web 12 may be a conventional magnetic tape or it may be a photosensitive medium, film or paper, having a virtually transparent magnetic coating covering the non-emulsion side of the photosensitive medium, herein referred to as film 12. It is not intended that the present invention be limited in any manner to any specific type of photosensitive medium or process. The mediums used in the illustrations are solely for purposes of illustration. The web guiding device 10 includes means defining an entrance 18 for accepting the film 12 into the magnetic reading and/or recording apparatus 16. The magnetic reading and/or recording apparatus may be part of a conventional recording and/or playback appliance such as a tape recorder or may be part of a photographic apparatus such as a photographic printer, processor, or camera. According to a preferred embodiment, the entrance 18 is defined by a housing 20. The preferred embodiment includes edge following means 22, referred to as an edge follower, attached to the magnetic reading and/or recording element 14 for tracking a longitudinal edge of the film 12 as it is moving along a defined path to maintain proper registration between the magnetic reading and/or recording element 14 and a magnetic information track on the film 12. The edge follower 22 is located initially in the defined path. A forward leading edge 21 moves the edge follower 22 to a variable tracking position tracking the longitudinal edge of the film 12 when the film 12 enters the magnetic reading and/or recording apparatus. The edge follower 22 is capable of pivoting between a first position parallel to the longitudinal edge of the film 12 as seen in FIG. 2A and 2C and a second position angled towards the entrance 18 as seen in FIG. 2B. The edge follower 22 is supported for pivotal movement between the first and second positions by a member 24 having at least one pointed end 26. The member 24 is attached to the housing 20 by any conventional means. In the preferred embodiment, the pointed end 26, about which the edge follower 22 pivots, contacts the magnetic reading and/or recording element 14 at a point 25 remote from a center point 29 of the magnetic reading and/or recording element 14 towards the entrance 18 as best seen in FIGS. 2A-C. Of course, the pointed end could contact the edge follower 22 as long as the contact point is remote from the center point of the magnetic reading and/or recording element 14 and is towards the entrance. It is advantageous having the contact point off center, as opposed to being centered, because the apparatus will have more of a tendency to automatically pivot about the point 25. It should be obvious to one skilled in the art that the edge follower could pivot about a point located between the center point of the magnetic reading and/or recording element and an exit and achieve a similar result. In this situation, the edge follower could be supported by a biasing means located so that the biasing means biases an end of the edge follower towards the longitudinal edge of the film. The preferred embodiment represented in FIG. 2 shows that the leading edge of the film has tapered corners. Furthermore, the preferred embodiment includes tapered edges on the edge followers. These features aid in the movement of the leading edge of the film into the magnetic reading and/or recording apparatus, however they are not required. The member 24 in the preferred embodiment includes a second pointed stop 27 at an opposite end of the member 24 for supporting a second magnetic reading and/or recording element 15 located directly opposite the other magnetic reading and/or recording element 14 along an opposite longitudinal edge of the film 12. Thus, as is evident from Figures 2A and 2B, pointed stops 26 and 27 contact the recording elements 14, 15 in a plane which is perpendicular and transverse to the film 12 and which intersects the edge followers 22, 23. Referring back to FIG. 1, the edge follower, which is attached to the magnetic reading and/or recording element 14, is attached to the housing 20 by a first flexible member 28. This flexible member 28 supports the magnetic reading and/or recording element 14 for rotation about a z-axis while restraining the magnetic reading and/or recording element 14 from rotating about an x-axis and a y-axis, wherein the x-axis and the y-axis are perpendicular to each other and the z-axis is perpendicular to the x- and y-axes. In the preferred embodiment, as seen in FIG. 1, the z-axis represents a direction perpendicular to a longitudinal axis of the film 12, the x-axis represents a direction transverse to the longitudinal axis of the film 12 and the y-axis represents a direction parallel to the longitudinal axis of the film 12. The first flexible member 28 comprises an upright portion 30 and two opposite leg portions 32 extending from and normal to the upright portion 30. The upright portion 30 is attached to a rigid frame 34 within the housing 20 by any conventional means. The upright portion 30 further includes a u-shaped opening 36 which allows the magnetic reading and/or recording element 14 to move in a direction transverse to the longitudinal axis of the film 12. The leg portions 32 are attached to the edge follower 22 by any conventional means. The configuration of the leg portions 32 allows the magnetic reading and/or recording element 14 to rotate about the z- axis perpendicular to the longitudinal axis of the film 12. In the preferred embodiment, the first flexible member 28 and a second flexible member 38 operate together to support the magnetic reading and/or recording element 14 for rotation about the z-axis and movement along the x-axis. The movement along the x-axis includes biasing the edge follower 22 towards the longitudinal edge of the film 12. The second flexible member 38 comprises a central portion 40 and two opposite arm portions 42 extending downward from the central portion 40. The central portion 40 is attached to the rigid frame 34 by any conventional means. The arm portions 42 are attached to the edge follower 22 by any conventional means. It should be obvious to one skilled in the art that the first and second flexible members can have alternate configurations as long as they support the magnetic reading and/or recording element for rotation about one axis while restraining rotation of the magnetic reading and/or recording element about the other axes and that they support the magnetic reading and/or recording element for movement along one of the axes while restraining the magnetic reading and/or recording element from movement along the other axes. The magnetic reading and/or recording apparatus 16 includes a backer device 44 as disclosed in copending EP 92 912 513 filed May 11, 1992 by Weigand et al. The backer device 44 insures that the magnetic information track maintains constant contact with the magnetic reading and/or recording element 14. The magnetic reading and/or recording element 15 is attached an edge follower 23 which is connected to the rigid frame 34 by flexible members similar to the first and second flexible members 28 and 38 described above. The operation of the magnetic reading and/or recording apparatus 16 in accordance with the preferred embodiment will be described referring to FIG. 2A-2C. FIG. 2A shows the film 12 approaching the entrance 18 and the magnetic reading and/or recording apparatus 16. The edge followers 22,23 are initially parallel to the longitudinal axis of the film 12 and in the defined path of the film 12. As the leading edge of the film 21 contacts the edge followers 22,23, the edge followers 22,23 pivot about the pointed ends 26,27 so that they are angled towards the entrance 18 creating a funnel, as best seen in FIG. 2B, for the film to easily enter the magnetic reading and/or recording apparatus 16. FIG. 2C shows the film 12 and the magnetic reading and/or recording element 14 (not visible) in a reading and/or recording position. The pointed ends 26,27 are no longer contacting the magnetic reading and/or recording element 14 and the edge followers 22,23 are in their variable tracking position contacting opposite longitudinal edges of the film 12 at this time. As the film 12 travels through the magnetic reading and/or recording apparatus 16, the edge followers 22,23 compensate for irregularities in the film edges and film width and the first and second flexible members 28 and 38 allow the magnetic reading and/or recording elements 14,15 to rotate about the axis perpendicular to the longitudinal axis of the film 12 and to move in the direction transverse to the longitudinal axis of the film 12. Thus, the magnetic reading and/or recording elements 14,15 will maintain proper registration with the magnetic information track on the film 12. Also, possible damage to the film 12 is minimized, thus maintaining the accuracy of the information read and/or recorded from/on the magnetic information track on the film 12. Furthermore, the magnetic reading and/or recording apparatus described is low cost and easy to manufacture. The present invention has been described in detail with particular reference to a preferred embodiment thereof, but it will be understood that variations and modification can be effected within the spirit and scope of the invention.

Claims: A magnetic reading and/or recording apparatus (16) for reading and/or recording information from/on a magnetic information track on a web of photosensitive medium (12), the apparatus including a magnetic reading and/or recording element (14, 15), a web guiding device (10) having means (18, 20) defining an entrance for accepting a web; means (22, 23) for following a longitudinal edge of a web, the magnetic reading and/or recording element being connected to the following means; and means (28-42) for supporting the following means to cause the following means to pivot between a first position parallel to a longitudinal edge of a web and a second position angled towards the entrance when a leading edge of a web enters the magnetic reading and/or recording apparatus, characterized by: a point about which the following means pivots being positioned towards the entrance from a center point of the following means and being located on a member (24) having at least one pointed end (26, 27) forming the point, the pointed end being in contact with either the following means or the magnetic reading and/or recording element.

Inventors: KIESOW RONALD HERBERT, KIESOW, RONALD HERBERT, KIESOW, RONALD HERBERT, C/O EASTMAN KODAK COMPANY
Applicants: EASTMAN KODAK CO, EASTMAN KODAK COMPANY
Application year: 1993
Main classification: G11B15
IPC codes: G03B17, G11B15