MXPA96002079A - Cartoon spring magnetic tape revest - Google Patents
Cartoon spring magnetic tape revestInfo
- Publication number
- MXPA96002079A MXPA96002079A MXPA/A/1996/002079A MX9602079A MXPA96002079A MX PA96002079 A MXPA96002079 A MX PA96002079A MX 9602079 A MX9602079 A MX 9602079A MX PA96002079 A MXPA96002079 A MX PA96002079A
- Authority
- MX
- Mexico
- Prior art keywords
- spring
- inches
- further characterized
- metal
- width
- Prior art date
Links
- 230000005291 magnetic Effects 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003973 paint Substances 0.000 claims abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011701 zinc Substances 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 4
- 239000004922 lacquer Substances 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 239000002966 varnish Substances 0.000 claims abstract description 3
- 230000005294 ferromagnetic Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 125000003700 epoxy group Chemical group 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims 12
- 239000002184 metal Substances 0.000 claims 12
- 238000011109 contamination Methods 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000003302 ferromagnetic material Substances 0.000 abstract 1
- 239000006249 magnetic particle Substances 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001737 promoting Effects 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
Magnetic tape cartridge reel spool of ferromagnetic material such as low carbon steel with an elastic limit greater than 7,030 Kg / cm2 (100,000 psi) coated with a hermetic layer. Alloy steels and AISI construction steels are also suitable. The coating inhibits the contamination of the magnetic tape and may include nickel sheet, zinc sheet, lacquer, paint, varnish and polymer coatings. One method includes coating a sheet of steel, cutting the sheet into strips and printing the figure of the spring with the ribbons in the strip of the
Description
COATED MAGNETIC TAPE CARTRIDGE SPRING
DESCRIPTION
Field of the invention
This invention relates to magnetic tape cartridges and, in particular, to spool springs used within magnetic tape cartridges
Background
Magnetic cartridge tapes are useful for storing a variety of information (ie, analog or digital). Magnetic tape cartridges, for example, may be used to store information derived, inter alia, from devices such as video and / or audio recorders. The medium used for the storage of the information within a magnetic tape cartridge is typically effected by means of a flexible strip of a non-magnetic material (i.e., plastic or mylar) coated with particles of a magnetizable metal oxide. Information is recorded on the tape during use by passing the tape over a recording head that magnetizes the oxide particles in a representative manner of the information to be stored. During the recording of the information, the tape is passed from a first to a second cartridge reel. A bead box (cartridge) of a magnetic tape cartridge provides a support structure and alignment for the two reels as well as a means to align, support, and control the tape as it passes between the two reels during recording and playback. the information stored. A spool spring is mounted inside the cartridge on a first side which adjusts and predisposes the spools to an opposite side of the cartridge. To protect the tape from a magnetic tape cartridge from lost sources of magnetism, the covers of the prior art cartridges have been constructed of non-magnetic materials (ie plastics). To further protect the magnetism belt, prior art has taught that reel springs must be constructed of a non-magnetic material such as stainless steel or aluminum. The prior art has taught that such practices were necessary for the reliable operation of magnetic tape cartridges. Even though in the prior art the use of stainless steels and aluminum in the construction of the reel springs has been effective, such materials are relatively expensive and difficult to work with. Because of the importance of magnetic tape cartridges, there is a need for a less expensive and more workable material for the construction of spool springs.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a plan view of a reel spring of a magnetic tape cartridge manufactured according to an embodiment of the invention. Figure 2 is a side elevational view of the spring of Figure 1. Figure 3 is a sectional view of the spring shown in Figure 1 taken along line 3-3 of Figure 2.
DETAILED DESCRIPTION OF A PREFERRED MODALITY
The Applicant has determined that ferromagnetic steel can be used for the construction of reel springs where the ferromagnetic steel is coated with a hermetic material. The prior art has suggested that ferromagnetic steel could not be used because of the magnetism associated with such steels. The applicant, on the other hand, has determined that the difficulty in the use of ferromagnetic steels for the construction of springs for reel lies in the generation of magnetic particles which separate themselves from ferromagnetic steels and deposit themselves on the magnetic tape, with which they interfere with the function of the tape. The Applicant has found that where a ferromagnetic spring is used in conjunction with a contamination confinement system such as an epoxy coating, that the utility of the prior art spool springs can be retained without the difficulty and expense associated with the materials of the prior art. The generation of magnetic particles by ferromagnetic steels can be associated with any of a variety of mechanisms. Corrosion can be a source, but surely it is not the only source. Other sources of magnetic particles from a reel spring include the metallic scaling of ferromagnetic steel due to the flexing of an uncovered spool spring or wear during normal use. Because the applicant's invention reduces the generation of magnetic particles by sealing the surface, the Applicant's invention is a contamination confinement system, rather than a corrosion prevention system. Figures 1 and 2 show a spring for reel 10 of a magnetic tape cartridge according to the present invention. The spring for reel 10 is made of low carbon steel with a coating 11. The spring 10 is of a general shape as illustrated in U.S. Pat. Nos. 5,005,780 and 4,899,243, the disclosures of these are incorporated by reference. The invention, however, is applicable to any form of spring suitable for use as a reel spring within a magnetic tape cartridge.
The spring 10 has a generally rectangular configuration defined by first and second longitudinal edges 12 and 14. These edges extend virtually over the entire length of the spring, parallel to the longitudinal center line. The edges are joined by rounded tips 16. In this manner, the perimeter of the spring defines upper and lower surfaces 17 and 19. The spring 10 has a flat central base portion 18 that is adapted to be attached to the cartridge case. A pair of holes 20 is formed in the base to facilitate the fixing of the spring to the case of a cartridge. In the preferred embodiment a pair of transverse folds, or fold lines 22, determine the extension of the base portion. The base portion 18 ends in the set of bends 22 that provide a fulcrum. These bends 22 define end portions 28. The end portions are bent out of the plane of the base at an angle to the plane of the base. Preferably, this angle is approximately 17 degrees. The set of bends (and the points of support) are symmetrical with respect to the center of the spring. The thickness of the strip is approximately 0.0254 to 0.0406 cm
(0.010 to 0.016 inches) and preferably approximately 0.0305 cm (0.012 inches). When the spring is at rest, the tips are intended to be located 1.0 cm (0.390 inches) above the base part. The length of the spring 10 in the flat condition is 10.0 cm (3,937) inches. When the tips diverge a distance of 0.2 cm (0.079 inches) from the base, the spring exerts a force on each side of approximately 140-200 grams.
The width between the longitudinal edges 12 and 14 of a spring that hinders the present invention is in the range of 0.70 to 0.89 cm (0.275 to 0.350 inches), sufficient to make a functional spring. According to the present invention, the upper and lower surfaces 17 and 19 are coated with a coating 11 better seen in the sectional view in figure 3. This coating envelops the surface and seals the metal particles adhering to the surface. The coating and the wrapped particles together form a pollution inhibition system that protects the magnetic tape from contamination. Springs other than those known for magnetic tape cartridges, the spring
is made of ferromagnetic steel, such as low carbon steel. It is contemplated that steel having an elastic limit above 7.030 Kg./cm (100,000 psi) will be appropriate for this invention. Alloy steel, and AISI construction steels which are ferromagnetic are also considered appropriate for this invention.
The coating 11 may consist of a variety of materials such as nickel plate, or zinc plate or chrome plate. Lacquer, paint rich in zinc or paint rich in aluminum, varnish, epoxy, or polymer coatings that include a variety of alternating polymer coatings that are impenetrable by contaminants coming from the surface of the pier through the coating. consider also acceptable. The coating must, of course, be sufficiently flexible to allow the spring or spring to function without damaging the coating. The purpose of building a cartridge with a ferromagnetic coated steel is to provide a spool spring that is more economical to manufacture based on the cost and manufacturing characteristics of the material. This is desired for limited life cartridges. Such cartridges are not commonly used for pre-recorded material that has to be kept for repeated use for a long period. Preferably, they are best used for limited work and used in communication of, for example, advertisements and promotional materials. The spring 10 is preferably made of cuts across the width of a belt, which is cut from a spool of material. To shape the springs, the tapes can be fed into a press according to the process disclosed in U.S. Pat. No. 4,845,820, whose disclosure is incorporated by reference. It is contemplated that the steel sheet is first coated and then cut and de-sized. Any suitable known process for coating the sheet can be used.
While the upper and lower surfaces 17 and 19 will be coated, the longitudinal edges 12 and 14 may not be coated. The rounded tips 16 are also not coated since they are formed in the stamping process. At least 90% of the exposed area of the dock surface is covered. Preferably, about 95% to 98% is coated. It is contemplated that the coating could be of the type that "heals" the scratches, such as galvanizing, which is oxidized to protect the exposed edges. The critical factor is to avoid the formation of particulate oxidization which is dislodged from the spring in flexion. Such particulate matter would have an adverse effect on the performance of the magnetic medium. Even when it is perceived that no adverse consequences would result from uncovered edges, an alternative would be to coat each spring after formed. The different aspects of the invention have been shown and described. It is contemplated, however, that various modifications may be made without departing from the scope of the invention.
Claims (22)
1. Cartridge spring for magnetic tape characterized in that it comprises an elongated metal strip including a base portion and at least one leg portion that separates out of the plane of the base, the spring is constructed of ferromagnetic steel.
2. The spring of claim 1, further characterized in that an elastic limit greater than 7.030 Kg./cm2 (100,000 psi) is constructed from low carbon steel.
3. The spring of claim 2, further characterized in that the material of the spring is selected from the group comprising low carbon steel, alloy steel, and AISI construction steel.
4. The spring of claim 1, further characterized in that the spring is coated in more than 90% of its surface area with a hermetic coating.
The spring of claim 4, further characterized in that the coating covers at least 98% of the surface area of the spring.
The spring of claim 4, further characterized in that the coating is selected from the group comprising nickel plate, chrome plate, or zinc plate.
The spring of claim 4, further characterized in that the coating is selected from the group comprising lacquer, paint, rich zinc paint, rich aluminum paint, varnish, epoxy, and polymer coatings.
The spring of claim 6, further characterized in that the spring is made of low carbon steel with an elastic limit greater than 7.030 Kg./cm2 (100,000 psi).
The spring of claim 6, further characterized in that the material of the spring is selected from the group comprising low carbon steel, alloy steel, and AISA construction steel.
10. The spring of claim 7, further characterized in that the spring is made d of low carbon steel with an elastic limit greater than 7.030 Kg./cm2 (100,000 psi).
The spring of claim 7, further characterized in that the material of the spring is selected from the group comprising low carbon steel, alloy steel, and AISA construction steel.
The spring of claim 1, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness of between 0.0254 and 0.0406 cm (0.0254 and 0.0406 cm (0.010 and 0.016 inches).
13. The spring of claim 2, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm (0.0254 and 0.0406 cm (0.010 and 0.016 inches)
14. The spring of claim 3, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm ( 0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm (0.010 and 0.016 inches)
15. The spring of claim 4, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges being of a width between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm (0.010 and 0.016 inches)
16. The spring of claim 5, further characterized because the spring comprises: an elongated strip of metal having generally parallel longitudinal edges with a width between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm (0.010 and 0.016 inches)
17. The The spring of claim 6, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm ( 0.010 and 0.016 inches).
18. The spring of claim 7, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness of between 0.0254 and 0.0406 cm (0.010 and 0.016 inches).
19. The spring of claim 8, further characterized in that the spring comprises: an elongated metal strip having generally parallel longitudinal edges with a width between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness between 0.0254 and 0.0406 cm (0.010 and 0.016 inches) .
The spring of claim 9, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness of between 0.0254 and 0.0406 cm (0.010 and 0.016 inches).
The spring of claim 10, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness of between 0.0254 and 0.0406 cm (0.010 and 0.016 inches).
22. The spring of claim 11, further characterized in that the spring comprises: an elongated strip of metal having generally parallel longitudinal edges having a width of between 0.76 and 0.89 cm (0.300 and 0.350 inches) and a thickness of between 0.0254 and 0.0406 cm (0.010 and 0.016 inches). VMRA (PCU! 016) 05/6
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US287851 | 1981-07-29 | ||
| US28785194A | 1994-08-09 | 1994-08-09 | |
| PCT/US1995/010169 WO1996005328A1 (en) | 1994-08-09 | 1995-08-08 | Coated magnetic tape cassette spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9602079A MX9602079A (en) | 1998-05-31 |
| MXPA96002079A true MXPA96002079A (en) | 1998-10-23 |
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