FR2499047A1 - HUB FOR MAGNETIC TAPE REEL OR CASSETTE, SUITABLE FOR FORMING THE SUPPORT OF THE MAGNETIC TAPE REEL - Google Patents

Abstract

THE HUB ACCORDING TO THE INVENTION CONSISTS OF A BODY ESSENTIALLY IN THE SHAPE OF A DISC 1, PROVIDED AT THE CENTER OF A HOLE 2 TO RECEIVE ONE OF THE DRIVING AXES OF THE VCR, AND, ON ITS TWO SIDES, OF A PART IN PROJECTION OF AN ESSENTIALLY RING-SHAPED WALL 7 WHICH EXTENDS A CONSTANT HEIGHT FROM THE BODY IN THE FORM OF A DISC TO REMAIN IN LIGHT CONTACT WITH THE INNER WALLS OF THE CASSETTE 9.

Description

The present invention relates to a hub for a tape reel holder

magnetic or "cassette" which is

  suitable for forming ma-tape reel holder

  genetic. We know that the reels of magnetic tape

  or cassettes are provided with two central holes, per-

  pendulars on the plane of these, through which are inserted the drive axes of the tape recorder, a rotating hub or pulley, corresponding to each

  holes, being suitably provided for being covered

  plé with one of the drive axes of the tape recorder, on which the magnetic tape placed inside the

  cassette is rolled up or unwound.

  The known hubs or pulleys consist of a body essentially in the form of a disc, provided in the center with a hole, suitable for receiving one of the drive axes of the tape recorder, and provided with internal radial teeth which are suitable for meshing. with some

  corresponding outer radial teeth of the axis of

  the tape recorder, so that the hub turns

  together with the drive axis.

  The ends of the magnetic strip are

  fixed on the outer contour of the hubs by systems

  Known essentially fixed joint types, which

  puts to get the stable connection of the band to the hubs.

  It is well known that an extreme function

  important is entrusted to the hubs of the cassettes, when these parts are the tape reel supports

  magnetic and are therefore included in the

  posers who are responsible for the proper advancement of the

magnetic tape.

  The position of the hub carrying the reel of magnetic tape is, in fact, one of the basic parameters

  operating affect of the cassette

  ment / depends on the correct position of the hub.

  In fact, in the case of the beginning of the unwinding of the reel strip, the position of the latter essentially depends on the position of the hub and its unwanted displacements are reflected on the position of the strip, especially in correspondence with the open -

  cassette exit, these displacements remain

  both essentially during the passage between the magnetic heads of the tape recorder with harmful consequences

  for a good recording or a good reproduction.

  Conversely, that is to say at the beginning of the rem-

  winding of the coil on the hub, all movements of the latter can cause incorrect winding of the coil, this drawback obviously having repercussions during the unwinding. This disadvantage can be increased by possible displacements which can occur for

  the other hub now holding the entire spool.

  Currently, the greatest disadvantage of known hubs is due to the possibility that this element, essentially in the form of a disc, does not maintain its faces parallel to the internal faces of the cassette because it does not remain stable inside this

  last, and the fact that its coupling with the axis of in-

  the tape recorder is not rigid.

  A certain degree of freedom is in fact ac-

  strung to the hub so as not to give the necessary power

  to drive the band too high, but this degree of li-

  berté negatively influences its position which does not remain fixed. The disadvantages mentioned above are

  affect the regular implementation of the casset-

  te, but they are especially apparent during the operation-

  tion of rapid winding and unwinding of the strip and also at the start of the rewinding operation of the strip at a normal drive speed; under these conditions, a maximum effort of the magnetic strip occurs, this effort inevitably having repercussions on

  the hub, causing it to move.

  An object of the present invention is a hub for a cassette of the type mentioned above which

  overcomes all the disadvantages mentioned above.

  The hub according to the present invention, se.c! Om-

  placing a body essentially in the form of a disc, provided in the center with a hole, suitable for coupling with one of the drive axes of the tape recorder

  and provided on its contour with means for blocking the ban-

  of magnetic, is characterized ei, that it is provided projecting on its two faces with an essentially annular part,

  which protrudes from the hub body from a height

  aunt. The hub for magnetic tape cassette according to the present invention will now be described, by way of example, with reference to the appended drawings in which: - Figure 1 is a plan view showing the hub according to the present invention; and - Figure 2 is a schematic view of the hub of Figure 1 taken along section II-II of the

Figure 1.

  Referring now to these figures, the hub according to the present invention consists of a body

  essentially disc-shaped, indicated in its

  appears by reference 1, which is provided in the center with a hole 2 suitable for receiving the drive axis of the

tape recorder (not shown).

  Hole 2 is provided with internal radial teeth

  3 which are suitable for meshing with

  corresponding teeth of the magnet drive shaft

phone.

  The contour 4 of the hub is provided with a set of

  ble of cavities 5, which are six in the example-

  ple of embodiment shown, each of them having a

  essentially semicircular cross section.

  The cavities 5 allow, in a con-

  naked, blocking the N end of the magnetic strip,

  more particularly what is called "tape leader".

  The blocking of the N primer is achieved by forcefully inserting a small segment 6 into one of the

  cavities 5, around which the end of the primer is pre-

  lably coiled. A wall essentially in the form of a ring or circular 7, concentric with the contour 4 of the hub,

  is provided and connected to this contour 4 by a flat wall

  dial 8. The wall 8 shows, schematically, the

  connection between the ring-shaped wall 7 and the con-

  round 4; this connection is actually a little different for essentially technological reasons, for

  example, due to the presence of reinforcing elements

  known transverse and radial, not shown. This-

  the connection therefore does not require any additional explanation

mental.

  The characteristic of the hub according to the present

  te invention is in fact that the height of the ring-shaped wall 7 is such that it emerges from the disc-shaped body of the hub so as to obtain on the two bases of the hub, a projecting part of a height

essentially constant.

  In fact, as seen in particular in Figure 2, the height of the ring-shaped wall 7 is greater than that of the contour 4 so that the

  extreme edges of the wall 7 protrude from the hub.

  By means of this characteristic, the hub is perfectly guided and maintained inside the cassette, because the extreme edges of the wall 7 are in slight contact with the internal walls of the cassette represented by dashes and indicated by the reference 9. In this way we prevent oscillations

  of the longitudinal axis of the hub with respect to the perpen-

  perpendicular to the walls 9, due for example to an

  correct from the tape. The contact between the wall 7 and the

  interior walls of the cassette also prevents displacements

  transverse cements of the hub, so that the advancement

  tape will always be correct.

  It is clear that changes and / or modifications may be made to the hub depending on the

  present invention, without departing from the scope of pro-

tection of this invention.

Claims (2)

  1. Hub for magnetic tape reel holder   or suitable cassette to form the booth support   magnetic tape, consisting of a body essentially (2) disc-shaped, provided in the center with a hole / suitable for receiving one of the drive axes of the tape recorder, characterized in that 4) is provided, on its   two bases, of a projecting part / of a cons-   appropriate aunt ijr stay in touch with the interior / cassette walls.   2. Cassette hub according to the claim   tion 1, characterized in that said projecting part (7) is the projecting part of the disc-shaped body of a wall essentially in the form of a ring of the hub, said wall being essentially concentric with the hole center of the hub. -