JPH03269888A - Tape reel - Google Patents

Abstract

PURPOSE:To prevent the momentary lowering of output occurring in recording and reproduction by providing a leader tape at the terminal part of a tape, and forming a part where the terminal part of first layer of the leader tape is housed lower than the tape receiving plane of a cylindrical reel hub by the thickness of the leader tape observating from a cross-sectional direction. CONSTITUTION:A tape layer wound previously receives a compressive force in a radius direction in each tape layer when a magnetic tape 5 is wound across a reel 1, however, since such structure that no step can be generated at the first layer of the leader tape by a clamper 3 which fixes the terminal part of the reader tape of a hub member is employed, thereby, no transfer of the step on the tape layer on which the tape is wound later is performed. The step when the tape is wound can be prevented occurring by providing the tape receiving plane 3a of the clamper 3 being located at the depth part in the radius direction by the thickness of the leader tape 13 than the tape receiving plane 2 of the hub member 12, and forming it so as to be connected successively smoothly to the receiving plane 2 of the reel hub advancing the terminal part 3b on the other side of the tape receiving plane of the clamper 3.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a tape cassette applied to, for example, a magnetic recording/reproducing device, and a tape cassette such as a take-up reel or a supply reel on which a magnetic tape is wound under tension. Regarding reels.

[Prior Art] Magnetic tape is widely used as a magnetic medium for household magnetic recording and reproduction, computer magnetic recording and reproduction, and the like.

For example, in the case of a magnetic recording/reproducing device, the tape transport device thereof is required to have very strict tape speed, acceleration, and deceleration characteristics. In these tape transport devices, the tape to be wound onto either reel is wound with a certain tension so that each tape layer imparts a radial compressive force on the previously wound tape layer.

The prior art will be described below with reference to the drawings. Figures 3 and 4
The figure shows an example of the conventional magnetic tape reel.

In FIG. 3, 11 is the leader tape 1 of the magnetic tape.
This clamper is for housing the end of the third layer of No. 3, and this clamper has the authority to fit into the hub member 12 by fitting, and the hub member 12 is a continuous cylinder with no steps as a whole. It forms a shaped tape receiving surface.

FIG. 4 is an enlarged view of the vicinity of the clamper 11 in FIG. 3. That is, the leader tape 13 of the magnetic tape is wound around the hub member 12, and each tape layer is wound while applying a compressive force in the radial direction to the previously wound tape layer.

[Problems to be Solved by the Invention] However, in the hub member of the conventional magnetic tape reel, as shown in FIG. 13a
occurs. The reason for this is that, as described above, the hub member 12 forms a continuous cylindrical tape receiving surface with no steps as a whole. This is because the first layer of the tape protrudes mainly by the thickness of the tape. Since there is a radial force acting on the inner tape layer, the step is transferred to the upper tape. As a result, when such a step is transferred to the tape, when the step 15 of the magnetic tape passes through the gap of the magnetic head, as shown in FIG. Separate. As a result, a performance problem has arisen in which a momentary drop in recording/playback output occurs.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a tape reel having a hub member that does not create a step in the tape.

[Means for Solving the Problems] In order to achieve the above object, the tape reel of the present invention includes a hub member rotatable in both directions, and when the hub member rotates in one direction, the tape is under tension. A tape reel formed with a plurality of layers is wound around the hub member, and a radially inward compressive force is applied to the plurality of layers and the hub member, the tape reel having a leader tape at an end of the tape. The reel is characterized in that the portion that accommodates the end of the first layer of the leader tape is formed lower than the tape receiving surface of the cylindrical reel hub by the thickness of the leader tape when viewed from the cross-sectional direction.

[Function] According to the configuration of the present invention described above, a leader tape is provided at the end of the tape, and the portion of the leader tape that accommodates the end of the first layer is placed closer to the tape receiving surface of the cylindrical glue hub. Since the leader tape is formed to be lower by the thickness of the leader tape when viewed from the cross-sectional direction, when the tape is wound, the edge of the leader tape of the second layer that is generated due to compressive force in the radial direction can be lowered by the step in the accommodation section and the upper layer. It is possible to eliminate the level difference caused by transfer to tape, and when used in a magnetic recording/reproducing device, for example, it can prevent the magnetic head from separating from the gap and prevent instantaneous output drops during recording/reproducing. .

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the reel 1 includes a cylindrical tape receiving surface 2, and the end of the leader tape is clamped and fixed by a clamper 3 between fixing parts 4. An enlarged view of the clamper 3, which is a fixed part, is shown in FIG. 2.

In this embodiment, the part that accommodates the end of the first layer of the leader tape is attached to the cylindrical reel hub in the direction in which the magnetic tape 5 is wound (rightward in the figure) from the leader tape end fixing part 4 of the clamper 3. It is formed lower than the tape receiving surface by the thickness of the leader tape when viewed from the cross-sectional direction. That is, the tape receiving surface 3a of the clamper is provided radially deeper than the tape receiving surface 2 of the hub member by the thickness of the leader tape, and the tape receiving surface 3a of the clamper is provided with a tape receiving surface 3a that is radially recessed from the tape receiving surface 2 of the hub member, and continues smoothly toward the other end 3b of the tape receiving surface of the clamper. It is formed so as to be continuous with the tape receiving surface 2 of the reel hub.

In this embodiment, when the magnetic tape 5 is wound onto the reel 1, each tape layer is subjected to a compressive force in the radial direction from the previously wound tape layer, but in this embodiment, the leader of the hub member The clamper 3 that fixes the end of the tape is
The first layer of the leader tape has a structure that does not generate a step difference, and this prevents the step difference from being transferred to the tape layer to be wound later.

As described above, according to this embodiment, by configuring the tape receiving surface 3a of the clamper 3 as described above, it is possible to prevent the occurrence of a step when winding the tape.

In addition, in this embodiment, the ramper 3 as shown in FIG.
However, the method of fixing the tape using a clamper is not limited to this. Further, the tape reel hub is not limited to those used inside a cassette, an open reel hub, and the like.

Furthermore, although magnetic tape was used in this embodiment, the type of tape is not limited to this as long as it can be wound on a reel.

As is clear from the above embodiments, the tape receiving surface of the clamper that fixes the end of the first layer of tape wound around the reel hub member is recessed in the radial direction by the thickness of the leader tape, and the other end is recessed in the radial direction by the thickness of the leader tape. By adopting a structure that smoothly and continuously connects to the tape receiving surface of the reel hub, the thickness of the leader tape of the first layer increases the instantaneous recording/playback output due to the distance from the head gap that exceeds the standard value. It is possible to provide a magnetic tape reel that can prevent serious deterioration.

[Effects of the Invention] As explained above, according to the present invention, a leader tape is provided at the end of the tape, and the portion of the leader tape that accommodates the end of the first layer is connected to the tape receiving surface of the cylindrical reel hub. Since the tape is formed to be lower when viewed from the cross-sectional direction by the thickness of the leader tape, when the tape is wound, the edge of the leader tape of the second layer is wrapped around the step in the accommodation section and the layer above it, which is generated due to compressive force in the radial direction. When used in magnetic recording and reproducing devices, for example, it prevents the magnetic head from separating from the gap and prevents instantaneous output drops during recording and reproducing. It can be distantly related to the excellent effect of being able to do it.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic tape reel according to an embodiment of the present invention, FIG. 2 is an enlarged view of a part of the clamper of the same embodiment, FIG. 3 is a plan view of a conventional magnetic tape reel, and FIG. FIG. 5, which is an enlarged view of a portion of the clamper of the conventional example, is a schematic diagram showing the separation from the head gap due to a step of a portion of the magnetic tape. 1... Reel, 2... Cylindrical tape receiving surface, 3...
・Clamper, 4... Leader tape end fixing part, 5.
...Magnetic tape, 11... Clamper, 12... Hub member, 13... Magnetic tape leader tape, 14
... Reel, 15... Step part of magnetic tape, 16.
...Magnetic head.

Claims (1)

[Claims] (1) a hub member rotatable in both directions; when the hub member rotates in one direction, the tape is wound under tension to form a plurality of layers around the hub member; A tape reel is provided on the member to which a compressive force is applied inward in the radial direction, the tape has a leader tape at the end thereof, and the part for accommodating the end of the first layer of the leader tape is formed into a cylindrical shape. A tape reel characterized in that the tape reel is formed to be lower than the tape receiving surface of the reel hub by the thickness of the leader tape when viewed from the cross-sectional direction.