JP4001419B2 - Manufacturing method of magnetic tape cartridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a magnetic tape cartridge. More particularly, to a manufacturing method of a magnetic tape cartridge containing a reel for winding the magnetic tape leader tape Ru is joined at its end.
[0002]
[Prior art]
Conventionally, as a magnetic tape cartridge used as a recording medium of a computer or the like, a magnetic tape cartridge in which a magnetic tape is wound around one reel and the reel is rotatably accommodated inside a cartridge case composed of an upper cartridge and a lower cartridge. There is.
[0003]
In use, this magnetic tape cartridge is used by pulling out the magnetic tape from the opening of the cartridge case. When not in use, the magnetic tape is completely wound on the reel, and the leader tape joined to one end of the magnetic tape (the engaging means provided in the device such as a computer is connected to the magnetic tape). Engaging means for introducing the tape into the tape path) is locked to the end surface portion of the cartridge case, and the reel is locked by a locking means such as a reel lock so that the reel does not rotate unexpectedly. The opening is closed by a lid that can be freely opened and closed.
[0004]
FIG. 7 is a side view of a state in which the leader tape is joined to one end of the magnetic tape. As shown in FIG. 7, one end of the magnetic tape 60 is joined to a leader tape 62 made of polyethylene terephthalate (PET) by a splicing tape 64. The leader tape 62 has a thickness t in the original fabric state before being subjected to predetermined processing, but in order to ensure the joining with the magnetic tape 60 by the splicing tape 64, the leader tape 62 is attached to the magnetic tape 60 side portion 62a. Taper processing is performed so that the thickness t gradually decreases. Further, since the taper portion does not cause a significant step at the joint portion between the leader tape 62 and the magnetic tape 60, stable running is possible.
[0005]
[Problems to be solved by the invention]
Conventionally, when the leader tape 62 is manufactured by applying taper processing to the PET raw material having the thickness t, the taper portion is processed by chemical treatment by etching. However, this chemical treatment by etching requires processes such as chemical application, cleaning, and drying, and therefore processing time is required, and since there are a plurality of processes, productivity is lowered. Furthermore, since the chemical treatment is costly, it causes a cost increase.
[0006]
In view of such circumstances, it is an object of the present invention to provide a method for manufacturing a magnetic tape cartridge capable of improving productivity and reducing manufacturing costs.
[0007]
[Means for Solving the Problems]
The above object of the present invention is to store a magnetic tape reel on which a magnetic tape is wound in upper and lower cartridges, and to which a leader tape that engages with an engaging means of an apparatus is joined to one end of the magnetic tape. In the cartridge manufacturing method, a step of cutting at least one side of the original tape of the leader tape into a taper shape, a step of cutting the taper-formed original material into a certain width and length, and the cutting viewed contains a step of bonding against tapered portion of the leader tape and the leading end of said magnetic tape, and the raw fabric of the leader tape, by the end mill through between the generally cylindrical end mill and metal roll when cutting, a magnetic tape, characterized in that for tilting the rotational axis of the end mill with respect to the rotational axis of the metal roll It is achieved by the manufacturing method of the cartridges.
Further, in a method of manufacturing a magnetic tape cartridge, a magnetic tape reel wound with a magnetic tape is housed in upper and lower cartridges, and a leader tape that engages with an engaging means of the device is joined to one end of the magnetic tape. A step of cutting at least one side of the original tape of the leader tape into a taper shape, a step of cutting the taper-formed original fabric into a certain width and length, and a taper processing of the cut leader tape. A step of abutting and joining the formed portion and the tip of the magnetic tape, and cutting the raw material of the leader tape with the end mill between a substantially cylindrical end mill and a metal roll, The tip peripheral part of the end mill is tapered so that the rotation axis of the end mill and the rotation axis of the metal roll are parallel to each other. Is achieved by the manufacturing method of a magnetic tape cartridge characterized and. At this time, it is preferable that the end portion of the end mill has a curved shape. Further, it is also preferable that the entire tip of the end mill has a curved shape.
[0008]
According to the present invention, the tip portion of the leader tape joined to the magnetic tape is mechanically cut into a taper shape. Since this cutting can be performed by mechanical processing, the processing time can be shortened and the cost can be reduced as compared with taper processing by chemical treatment.
[0009]
As a means for performing the taper processing by cutting, for example, a method in which the substantially cylindrical end mill has a predetermined angle with respect to the rotation shaft of the roller that supports the original fabric, or the end mill itself is tapered. It is possible to employ a method in which processing is performed and the raw material is cut at the tapered portion. In that case, it is preferable that the end of the end mill has a curved surface. This is because stable cutting can be performed by using a curved surface.
[0010]
Further, as a result of the taper processing, the thickness of the tip of the leader tape gradually decreases, but generally the thickness of the leader tape is about 100 to 200 μm, which is considerably thicker than the thickness of the magnetic tape. However, the thickness is gradually reduced only to 2 to 10 times the thickness of the magnetic tape, but if it converges to such a thickness difference, a desired effect can be obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a magnetic tape cartridge according to an embodiment of the present invention.
[0012]
In the magnetic tape cartridge 1 shown in FIG. 1, a magnetic tape 20 is wound around one reel 3 formed by, for example, ultrasonic welding of an upper reel 4 and a lower reel 5, and this reel 3 is used as an upper cartridge 2a and a lower cartridge 2b. Are rotatably housed in a cartridge case fastened by screws 19.
[0013]
In the reel 3, the upper reel 4 has an upper flange 4a, and a concave portion is provided at the center thereof. And the gear part 4b is formed in the outer periphery of this upper flange 4a. A ring-shaped bearing 6 is press-fitted and fixed in a circular rib formed in the recess, and a spring plug 7 is press-fitted and fixed in a hole in the center of the bearing. A reel spring 8 is attached to the spring plug 7 to press the reel 3 downward and hold it rotatably.
[0014]
The reel 3 is locked so as not to rotate unexpectedly by a reel lock 32 appropriately biased by a reel lock spring 12 when the cartridge is not used. In addition, when the magnetic tape cartridge 1 is not in use, the leader tape 21 attached to the end of the magnetic tape is incorporated closer to the side of the cartridge with the magnetic tape 20 completely wound on the reel 3. The front end of the hook 18 is locked.
[0015]
A lid 30 that can be opened and closed in the cartridge plane direction is attached to the opening 26 through which the magnetic tape 20 is drawn out by being appropriately urged by a lid spring 15 for urging the lid. The leader tape 21 that engages with the engaging means for introducing the magnetic tape 20 into the tape path of the apparatus is joined to the magnetic tape 20 by, for example, a splicing tape.
[0016]
Next, with reference to FIG. 2, the manufacturing method of this leader tape is demonstrated. As shown in FIG. 2, a PET original fabric 40 having a thickness larger than that of a magnetic tape is wound around a supply roll 41, and the original fabric 40 supplied from the supply roll 41 is first a first metal roll 42. And the first end mill 43, the second metal roll 45 and the second end mill 46, and finally the take-up roll 48.
[0017]
FIG. 3 is a bottom view of the first metal roll 42 and the first end mill 43 shown in FIG. As shown in FIG. 3, in the raw fabric 40, a to-be-cut portion 40 a indicated by hatching is mechanically cut into a tapered shape by a substantially cylindrical end mill 43. The rotation axis of the first end mill 43 is not parallel to the rotation axis of the first metal roll 42 but has an angle. By appropriately setting this angle and moving the first end mill 43 in the original fabric direction, the cut portion 40a of the original fabric 40 can be tapered by a desired amount.
[0018]
When the cut portion 40a on one side of the original fabric 40 is tapered by the first end mill 43, the other end of the original fabric 40 is similarly processed by the second end mill 46 shown in FIG. It is wound on the winding roll 48. Finally, predetermined processing is performed by a press, and a leader tape 21 having a predetermined width and length and provided with an engagement hole is manufactured. Thereafter, the taper-processed portion of the leader tape 21 and the magnetic tape 20 are joined from both sides with a splicing tape. As described above, since the processing of the tapered portion of the leader tape 21 is performed by a mechanical method, it is advantageous in terms of time and cost over conventional chemical treatment.
[0019]
For the material to be cut, the size in the longitudinal direction is not precisely cut, but a slightly larger portion is made in the longitudinal direction, and the size is adjusted by press-cutting at the final press stage. May be. Also, instead of the machining steps as shown in FIG. 2, after the portion to be cut is tapered by the second end mill 46, a cleaning roll is provided to clean the surface of the original fabric, and press punching is performed immediately thereafter. Can be a continuous process.
[0020]
Next, a second embodiment of the present invention will be described. As shown in FIG. 4, in the second embodiment of the present invention, the rotation axis of the metal roller 42 and the rotation axis of the end mill 49 are set in parallel, and the tip 49a of the end mill 49 itself is tapered. And the to-be-cut part 40a shown by the hatching of the original fabric 40 is mechanically cut by the end mill 49 into a taper shape. Also by this method, processing the taper portion by a mechanical method is advantageous in terms of time and cost over the conventional chemical treatment.
[0021]
Next, third and fourth embodiments of the present invention will be described. As shown in FIG. 5, in the third embodiment, the tapered portion 51 of the end mill 50 is the same as the end mill 49 shown in FIG. 4, but the tip 51 a has a curved shape. Moreover, as for the end mill 60 which concerns on 4th Embodiment of this invention shown in FIG. 6, the front-end | tip part whole 61 has a curved surface shape.
[0022]
Here, as shown in FIG. 4, when the tip of the tapered portion 49a of the end mill 49 is flat, the cutting start portion to which no pressure is applied during cutting is not constant, resulting in poor appearance. On the other hand, the end mills 50 and 60 shown in FIGS. 5 and 6 have a curved tip end portion, so that pressure can be applied to the cutting start portion during cutting, and stable cutting is possible. Accordingly, the cutting start portion of the original fabric can be kept constant, the cutting margin of the cutting start portion can be surely taken, and the difference in thickness of the splicing tape attached to the tapered portion can be reduced.
[0023]
Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed and improved based on the gist of the present invention. For example, the shape of the end mill that cuts the taper portion is not limited to the above-described shape, and it is also possible to provide a step portion at the tip of the end mill so that the tapered portion is inclined. Further, the taper portion may not be provided on both sides of the original fabric, but may be provided only on one side, and the leader tape and the magnetic tape may be joined by the splicing tape.
[0024]
【The invention's effect】
As described above, according to the present invention, the leading end of the leader tape that engages with the engaging means of the apparatus is joined to the leading end of the magnetic tape in abutting manner, and the leading end portion of the leader tape is tapered. Since it is mechanically cut, various processes such as chemical application, cleaning, and drying that have been performed during conventional chemical treatment can be omitted, and processing time can be shortened and costs can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a magnetic tape cartridge according to an embodiment of the present invention.
FIG. 2 is a schematic view for explaining a method for producing a leader tape.
FIG. 3 is a bottom view of the metal roll and end mill shown in FIG. 2;
FIG. 4 is a bottom view of a metal roll and an end mill according to a second embodiment of the present invention.
FIG. 5 is a side view of an end mill according to a third embodiment of the present invention.
FIG. 6 is a side view of an end mill according to a fourth embodiment of the present invention.
FIG. 7 is a side view of a state in which a leader tape is joined to one end of a magnetic tape.
[Explanation of symbols]
1 Magnetic Tape Cartridge 2a Upper Cartridge 2b Lower Cartridge 3 Reel 20 Magnetic Tape 21 Leader Tape

Claims (4)

In the manufacturing method of the magnetic tape cartridge, the magnetic tape reel around which the magnetic tape is wound is housed in the upper and lower cartridges, and the leader tape that is engaged with the engaging means of the device is joined to one end of the magnetic tape.
Cutting at least one side of the raw material of the leader tape into a tapered shape;
Cutting the taper-formed original fabric into a certain width and length;
Look including the steps of: bonding against the tip of the tapered portion of said cut leader tape and the magnetic tape,
When the raw material of the leader tape is cut by the end mill between a substantially cylindrical end mill and a metal roll, the rotation axis of the end mill is inclined with respect to the rotation axis of the metal roll. A method for manufacturing a magnetic tape cartridge. In the manufacturing method of the magnetic tape cartridge, the magnetic tape reel around which the magnetic tape is wound is housed in the upper and lower cartridges, and the leader tape that is engaged with the engaging means of the device is joined to one end of the magnetic tape
  Cutting at least one side of the raw material of the leader tape into a tapered shape;
  Cutting the taper-formed original fabric into a certain width and length;
  Abutting and joining the tapered portion of the cut leader tape and the tip of the magnetic tape; and
When the raw material of the leader tape is cut by the end mill between a substantially cylindrical end mill and a metal roll, the tip mill of the end mill is tapered so that the rotation shaft of the end mill and the metal roll A method of manufacturing a magnetic tape cartridge, characterized in that the rotation axis of the magnetic tape cartridge is made parallel. 3. The method of manufacturing a magnetic tape cartridge according to claim 2, wherein a tip end portion of the end mill has a curved shape. 3. The method of manufacturing a magnetic tape cartridge according to claim 2, wherein the entire tip of the end mill has a curved shape.

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