WO1998018127A1 - Cassette a bande avec un entrainement par courroie amelioree pour diminuer le glissement a l'interface avec la bande - Google Patents

Cassette a bande avec un entrainement par courroie amelioree pour diminuer le glissement a l'interface avec la bande Download PDF

Info

Publication number
WO1998018127A1
WO1998018127A1 PCT/US1997/003139 US9703139W WO9818127A1 WO 1998018127 A1 WO1998018127 A1 WO 1998018127A1 US 9703139 W US9703139 W US 9703139W WO 9818127 A1 WO9818127 A1 WO 9818127A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
tape
housing
raised
disposed
Prior art date
Application number
PCT/US1997/003139
Other languages
English (en)
Inventor
James A. Eggebeen
Original Assignee
Gigatek Memory Systems
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gigatek Memory Systems filed Critical Gigatek Memory Systems
Priority to AU20597/97A priority Critical patent/AU2059797A/en
Publication of WO1998018127A1 publication Critical patent/WO1998018127A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
    • G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
    • G11B23/08707—Details
    • G11B23/08778—Driving features, e.g. belt

Definitions

  • the present invention relates generally to magnetic tape data storage media for computer systems and, more specifically, to an improved belt for a belt-driven tape cartridge and a method of making the belt.
  • the belt-driven tape cartridge described in U.S. Patent No. 3,692,255, issued to von Behren is used in conjunction with a tape drive unit to store and retrieve data in a computer system.
  • the cartridge includes a base plate and a housing. Two spools are rotatably mounted in the housing on pins perpendicular to the base plate.
  • the spools of the von Behren cartridge comprise a cylindrical hub with two flanges having diameters greater than that of the hub. The tape is wound around the hub between the flanges.
  • the hubs are aligned on an axis parallel to the front wall of the housing in which the tape drive and tape read/write openings are located.
  • the tape is driven between the hubs by means of a flexible elastic drive belt that extends around a drive roller at the front of the housing and contacts the tape on the two hubs before extending around a pair of corner rollers.
  • the drive belt moves in response to rotation of the drive roller.
  • the tape In a von Behren cartridge, the tape is magnetically encoded on one side only.
  • the magnetic side is referred to as the front of the tape.
  • the belt contacts the front side of the tape when it drives the tape hubs. It has been recognized that when the hub spins at high speeds, the belt tends to slip on the tape surface.
  • One culprit apparently is air driven under the belt by the spinning hubs. The air pressure pushes on the belt causing variance in tape tension as the belt slips. This is undesirable because tape speed cannot be controlled without constant tension. In an attempt to solve this problem, U.S.
  • Patents 4,466,564, and 4, 581 , 1 89 each to Smith et al. disclose an apparatus and a method for making such an apparatus, respectively, to promote the release of air from between the belt and the underlying tape in a von Behren type cartridge to minimize variations in tape tension and tape speed.
  • Demand for tape cartridges capable of maintaining high tape speed has increased in view of requirements for faster data storage and retrieval.
  • These cartridges are known as mini-cartridges.
  • Typical prior art mini-cartridges have operated at about 90 inches per second (ips), but there is a growing demand for mini-cartridges able to maintain tape speeds of about 1 20 ips.
  • belts made in accordance with the teachings of Smith demonstrate slippage at high tape speeds of 1 20 ips.
  • Another disadvantage of belts made in accordance with the above- referenced Smith patents is the requirement that a microscopically small rough surface be applied.
  • the rough belt surface of the Smith patents is disclosed as having discontinuities ranging in size from between 0.2 to 40 micrometers peak to peak, such that these discontinuities are not visible to the naked eye.
  • the reference teaches that the disclosed polyetherurethane belt will probably damage the tape if surface roughness exceeds the disclosed microscopic range.
  • it is difficult to maintain quality control with Smith type belts because the surface cannot be inspected visually without expensive microscopes or other optical equipment.
  • Another solution for releasing air in a tape cartridge is disclosed by
  • Newell in U.S. Pat. No. 4,342,809. Newell is directed to a different type of tape cartridge than the von Behren cartridge.
  • the Newell type cartridge includes two belts, a drive belt as in the von Behren cartridge and a tensioning belt stretched over the outer peripheries of the drive roller and the belt guide rollers.
  • the Newell patent discloses either coating a metal or plastic tape with a thin elastomeric film or wounding filaments having a high modulus of elasticity within a matrix of a low modulus of elasticity.
  • the Newell disclosed technique has not been applied to a von Behren type cartridge, probably because the solution would be inadequate to address belt-tape slippage where no tensioning belt is available to provide additional tension.
  • this invention provides a belt-driven tape cartridge having a belt with a visible surface texture of raised plateaus in a predetermined pattern for preventing belt slippage between the belt and the tape surface.
  • a preferred method for forming the belt includes forming a pattern on a sheet of extruded material, cutting the sheet into rings, and stretching each ring to form the belts with the visible surface texture formed thereon.
  • One preferred pattern for the rings is that of visible cylindrical protrusions which results in three-dimensional rounded protrusions having elliptical faces disposed on the belt that is formed by stretching the ring.
  • the faces are offset at non-straight angles from each other and of different sizes.
  • the faces form the raised plateaus.
  • An alternative pattern is that of three-dimensional rounded protrusions with elliptical faces which results in visible three-dimensional almost cylindrical protrusions on the belt formed by stretching the ring.
  • the faces are elliptical, offset in substantially straight angles from each other and the sizes are substantially equal to each other.
  • Still another alternative pattern is that of a cell, such as a honeycomb type structure, wherein the walls of the cell form the raised plateau texture.
  • the belt is formed of at least one polyetherurethane material. Nevertheless, the belt may be made of other materials, rather than polyetherurethane. Two polyetherurethane materials may be blended into a homogenous mixture by melting both materials and mixing the molten material and forming the belt from the resulting polymeric mixture with the visible pattern disposed thereon.
  • a single polyetherurethane polymer may be used as the material comprising the belt if that single material has the requisite properties of flexibility and durability.
  • Fig. 1 is a plan view of a tape cartridge including the belt of the present invention in a prior art compatible tape drive ;
  • Fig . 2 is a plan view of a drum roller used to form a visible surface texture of raised plateaus on the belt of the cartridge of the present invention shown in Fig. 1 ;
  • Fig. 3 is an enlarged view of the pattern on the roller of Fig. 2 that is used to create the visible surface texture of raised plateaus on the belt of the cartridge of Fig. 1 ;
  • Fig. 4 is a plan view of a sheet of material made by the process shown in Fig. 1 2 and having a surface texture formed by the roller of Fig. 2 and used to create the belt of the cartridge of Fig. 1 ;
  • Fig. 4a is an enlarged view of the surface texture of the sheet of Fig. 4;
  • Fig. 5 is a plan view of a ring cut from the sheet of Fig. 4;
  • Fig. 6 is a plan view of a belt created by stretching the ring of Fig. 5 that may be used as the belt in the cartridge of Fig.1 ;
  • Fig. 7 is an enlarged view of the surface texture on one embodiment of the belt of Figs. 1 and 6;
  • Fig. 7a is a sectional view of the belt of Fig. 7 taken along sectional lines la-la;
  • Fig. 8 is a plan view of a ring cut from material similar in construction to the segment of Fig. 4, but showing an alternative embodiment of a predetermined pattern for creating a visible surface texture of raised plateaus
  • Fig. 9 is a plan view of a ring cut from material similar in construction to the segment of Fig. 4, but showing an alternative embodiment of a pre- stretched pattern for cleating a visible surface texture of raised plateaus;
  • Fig . 9a is a sectional view of the ring of Fig. 9 taken along section lines 9a-9a;
  • Fig. 10 is a plan view of a belt created by stretching the ring of Fig.
  • Fig. 1 1 is an enlarged view of the surface texture of the belt of Figs. 1 and 1 0;
  • Fig. 1 2 is a flow diagram illustrating the steps of making the belt of Fig. 1 2;
  • Fig. 1 3 is a schematic diagram illustrating a manufacturing arrangement for making the belt of Fig. 1 ;
  • Fig . 1 4 is an enlarged view of the surface texture of another embodiment of the belt of Fig. 1 .
  • Figs. 1 shows a von Behren type cartridge 1 1 for reading and writing of recording tape 1 8 by tape head 24 that is part of the drive.
  • Data cartridge 1 1 comprises a metal base plate 1 0, a transparent plastic cover 1 2, and a pair of tape spools 1 4. Together base plate 1 0 and cover 1 2 form cartridge housing 1 3.
  • Spools 1 4 are rotatably supported on the base plate 1 0 by cylindrical spindles 1 6 that are fixed perpendicularly into base plate 10.
  • a magnetic recording tape 1 8 is wound around spools 14 at opposite ends and extends between spools 1 4 along a predetermined path around various fitted tape guides 20. The path extends across a tape head opening 22 in the front wall of the cartridge to provide access for a tape head 24.
  • a belt driving roller 26 is mounted adjacent a drive opening 28 in the front wall of the cartridge.
  • a drive belt 30 extends around belt driving roller
  • the belt 30 includes a surface texture of raised plateaus in a predetermined pattern (Figs. 6-8, and 1 0- 1 1 ) on the side in approximate contact with the tape. For example a contact point 50 exists at the interface of tape 1 8 and belt 30 and the texture is on the side of belt 30 making direct contact with the tape.
  • Belt 30 is a primary source of tension for tape 1 8, since there is no other belt in the cartridge. Referring to Fig. 1 2, a method for making the belt 30 is shown. In step 1 202, two polyetherurethane materials of different molecular weight are blended. A suitable choice for the materials is disclosed in U.S. Pat. No.
  • the belt of the present invention is preferably composed of a blended polyetherurethane material composed of high and low molecular weight resins blended together.
  • One of the resins controls the high speed response while the other controls the gross effects of cartridge performance.
  • the cartridge dynamic response in maintained even under cases of low belt tension .
  • the high molecular weight (about 260,000 m.w.) resin is a polyetherurethane known as "Pelletane” '" polyetherurethane No. 2103-90AEF from the Dow Chemical Company and the low molecular weight (about 1 60,000 m.w.) known as "Estane”TM compound 58887 from the B.F. Goodrich Chemical Co.
  • the two polyetherurethane materials are blended into a homogenous mixture by melting both materials and mixing the molten material.
  • the belt is formed from the resulting polymeric mixture.
  • a single polyetherurethane polymer may be used as the material comprising the belt if that single material has the requisite properties of flexibility and durability.
  • the polyetherurethane materials may be mixed together in the form of dry pellets in a drum that blends the dry materials by spinning them together in step 1 202.
  • step 1 204 the dry materials are melted at about 400 degrees Fahrenheit, in a contained screw auger device that moves the molten material and extrudes it out through a narrow slot onto a substrate carrier in step 1 206.
  • step 1 207 the carrier with the polymeric mixture is disposed on a substrate carrier and moved by a tractor pulley arrangement about two inches through two rollers disposed on either side of the carrier and mixture.
  • the mixture is formed with a pattern by the roller in direct contact with it.
  • step 1 209 following the formation of the pattern, the mixture is cooled on the substrate by the rollers which are water chilled.
  • the pattern forming roller is discussed in detail below with reference to Fig. 2.
  • step 1 21 2 after the material is rolled under the pattern forming roller it continues to be moved by the tractor pulley arrangement. It is sized into appropriate width sheet or sheets by knife blades disposed in the carrier's path, in step 1 21 0.
  • step 1 21 2 the carrier and solidified mixture are rolled onto a tube, such as cardboard. The roll is removed from the general area and is available for the next steps, which may be performed immediately or much later.
  • step 1 21 4 the sheet is unrolled and rings (Fig. 5, 8, and 9, discussed below) are punched out with a die, or other suitable cutting tool. The ring is cut while still disposed on the substrate carrier, but the carrier is not cut. The die only penetrates the solidified mixture and not the carrier.
  • step 1 21 The cut ring is placed over opposing mandrels in step 1 21 6.
  • step 1 21 8 heat is applied by raising the temperature to about 80 degrees Celsius.
  • the mandrels are rotated and the opposing pairs are slowly pulled apart at some predetermined stretch rate to achieve uniform stretching in step 1 220.
  • step 1 222 the belts are allowed to cool. Since the belts are very thin cooling does not take very long.
  • the cooled belts are removed in step 1 224, and are ready for being stretched over the belt guide rollers and drive roller as shown in Fig. 1 .
  • FIG. 1 3 shows a simplified schematic of a manufacturing line 1 300 for making sheets. Steps 1 202 and 1 204 occur in extruder 1 302 which contains the roller and auger. Step 1 206 occurs at the throat 1 304. Step 1 207 — disposing the mixture on the substrate carrier occurs in region 1 306. The pattern is formed and the mixture is cooled in region 1 308 (steps 1 208 and 1 209) . The sheet is sized and rolled (steps 1 21 0-1 21 2) past region 1 308 (all of manufacturing line not shown for simplicity) .
  • Fig. 2 shows the pattern forming drum 200 useful in step 1 209 of the above-described process.
  • Fig. 3 is an enlarged view of an exemplary pattern for forming a visible surface texture on belt 30.
  • the roller has indented circular areas disposed thereon for forming a predetermined pattern onto the material mixture.
  • An enlarged view in Fig. 3, shows an exemplary pattern of longitudinally aligned circular indentations 300 that create a pattern on the material mixture when it cools and dries.
  • the indentations may be made by known machining processes, such as using an end mill.
  • a preferred embodiment of the indentations on roller 200 comprises about 720 total holes, each about 0.007 inches deep and having a diameter of about 0.031 inches.
  • other visible surface texture patterns can also prevent slippage at the belt and tape interface, and some of these alternatives are discussed below with reference to Figs. 8, and 10.
  • the pattern discussed with reference to Fig. 7, and produced by roller 200 has been tested by the inventor and compared to cartridges having prior art belts and the results are now discussed.
  • Fig. 4 shows a segment of the cooled mixture forming rectangular sheet 400 on paper substrate 402.
  • the paper substrate may be simply peeled away, because it preferably has a silicone coating allowing for easy separation.
  • Rectangular sheet 400 may be then cut into a desirable geometric shape for forming the belt, such as a ring.
  • Fig . 5 shows a ring 500 cut from the sheet 400 with the paper substrate removed.
  • the ring is cut in accordance with step 1 21 4 discussed above.
  • the paper is removed before cutting.
  • the pattern 41 0 formed by pattern forming roller 200 can easily be seen disposed on surface 504 of ring 500.
  • the patterned ring is then placed on mandrels, heated, stretched, cooled and removed in accordance with respective steps 1 21 6- 1 224 (Fig. 1 2) .
  • Pattern 41 0 of ring 500 is formed by closely spaced cylindrical protrusions 520, in other words the reciprocal of the indentations on roller 200.
  • Fig. 6 shows endless belt 30a (an embodiment of belt 30 of Fig. 1 ) formed by the process shown in Fig.
  • Fig. 7 shows an enlarged view of one embodiment of pattern 602.
  • the belt surface texture pattern 602 (result of stretching pattern 410) is a series of visible three dimensional protrusions 690 having elliptical faces 61 0.
  • the shape of the faces results from stretching corresponding cylindrical protrusions disposed on ring 500.
  • Each elliptical face is disposed at non-straight angles to the other faces. Note that those near its inner diameter (d,) are stretched more along the resulting major axis of the elliptical face than those located closer to the outer diameter (d 0 ) of the ring so they are longer along the major axis. Following the stretching, the protrusions are visible to the human eye.
  • IES Lighting handbook 1 981 , IESNA, New York, New York
  • visual acuity describes the visibility of fine details that can be discerned by the naked eye. Below 40 micrometers, details cannot be observed without a microscope. The protrusions of the belt of the present invention are clearly visible and therefore must exceed 40 micrometers in height.
  • Figs 7 and 7A sectional view taken along lines 7A - 7A of Fig. 7
  • the surface texture pattern 602 of the raised plateaus is shown.
  • each face 61 0 is smooth having very little surface roughness.
  • each valley region 620 between plateaus is also smooth.
  • one or more of the faces may be rough, and one or more valley regions may also be rough.
  • any belt surface that may contact the tape is smooth. It is surprising that a smooth surface would have the effect of preventing belt slippage at high tape speed and particularly when the overall surface texture is visible. This is contrary to the teachings of the prior art, especially those of the Smith patents that teach the necessity of a microscopically rough surface to prevent belt slippage while simultaneously avoiding tape damage.
  • the present belt is not microscopically rough, rather it has a visible pattern of raised plateaus wherein the faces of the plateaus are smooth relative to the rest of the tape surface.
  • the preferred height of the protrusions (h) (Fig. 7A) is less than or equal to .007 inches (about 1 77 micrometers) measured from the bottom of tape portion 620 in the valley region to the top of plateau 61 0.
  • the tape portion 620 (valley floor) has a thickness (t) of about .002 inches. Therefore the additional height over the normal belt thickness is about .005 inches or (h-t).
  • the raised protrusions cover between about 20% to 80% of the surface area of the belt measured across the width of the tape W.
  • the sample specimen fell in about the middle of the preferred range.
  • about 101 raised protrusions covered an exemplary rectangular area of belt, about 3/1 6" wide and about 1 " long.
  • the raised plateau faces covered about 57% of the overall surface area. Before stretching there were about 1 45 protrusions over the same area, covering about 58% of the overall surface.
  • having a smooth plateau on the raised protrusion may contribute to lowering the risk of tape damage and provides superiority over a generally rough, even randomly dispersed texture pattern as in prior art belts.
  • the visible surface texture provides a benefit of ease of manufacturing and particularly with regards to quality control.
  • Fig. 14 shows another embodiment of a visible surface texture pattern 1 400 of raised plateaus, wherein faces 1 41 0 are elliptically faced as in pattern 602, but there are no valleys between face 1 420 which runs continuously without valley regions interrupting the texture. Face 1420 is substantially at least two raised plateaus connected without valley regions in between.
  • Fig. 8 shows another embodiment of a visible surface texture pattern 800 that is a series of closely spaced cells 802 shaped as a polygon, each having a chamber 804, where air may collect.
  • polygon-shaped cell 802 has a honeycomb or hex geometry, but other cell shapes will suffice.
  • the inventor has made the critical recognition that it is not always necessary for air to be released between the tape and belt to prevent slippage. This discovery is also very surprising and counter to the beliefs of those skilled in the art.
  • the inventor has recognized that as long as the cell is sized so that a volume of air may be carried in chamber 804 that is substantially greater than the volume of air that might be pulled in, the chamber will be at a lower pressure and will draw air into the chamber without creating a vacuum effect or expanding.
  • the surfaces of the chamber walls 803 disposed to contact the tape serve as raised plateau faces for the belt to provide advantages similar to pattern 602.
  • Figs. 9, 9a, and 10 show an alternative visible surface texture pattern 900 and 922 formed on ring 902, and belt 30b (an embodiment of belt 30 of Fig. 1 ), respectively.
  • Fig. 1 1 shows an enlarged view of the pattern formed on the belt.
  • the pattern may be formed by a drum, similar to the drum of Fig. 2, by employing known numerical control methods to form a suitable pattern forming surface.
  • the preferred geometry of pattern 900 is that of closely spaced rounded three-dimensional protrusions that start at the inner diameter d, of ring 902 (only a portion shown) with a first structure 904 having a circular face 906 of radius 908.
  • each three- dimensional protrusion's face becomes elliptically shaped.
  • face 91 0 of protrusion 91 2 is elliptically shaped having an minor axis 91 4 equivalent to radius 908.
  • the major axis of elliptical face 91 0 is greater than radius 908.
  • each succeeding protrusion, such as protrusion 920, proceeding toward the outer diameter of ring 902 has an elliptical face with a minor axis equivalent to minor axis 91 4 but with a larger major axis than each preceding protrusion.
  • Each protrusion is centered along a radial line, such as radial line 91 6, and each is located by polar (circular) coordinates rather than Cartesian (rectangular) components.
  • This arrangement of the pattern is based on the inventor's critical recognition that protrusions disposed near the inner diameter (d,) of ring 902 (e.g. protrusion 91 2) will be stretched more along their major axis than will the major axes of protrusions such as protrusion 91 2 disposed nearer the outer diameter of ring 902 when the belt is formed in accordance with steps 1 21 6- 1 224.
  • the resulting pattern 922 (pattern 900 after stretching) is that of raised protrusions having substantially equal elliptical faces but aligned in straight columns.
  • the ellipses are at straight angle offsets to each other's ellipse.
  • the stretching aligns the radials disposed rounded pattern of combined circular faced and elliptical faced protrusions of ring 902 into columns in a reverse fashion that the raised cylindrical protrusions 520 on ring 500 are converted into three- dimensional elliptically faced protrusions disposed on an arcuate path.
  • pattern 922 yields the same advantages of above-described pattern 602, because each protrusion face provides a smooth plateau. For any uniform area there is a predetermined area of protrusions dispersed across the width of the belt and preferably in approximately the same ratio (about 57% of the surface of the belt) . The difference between the height of the protrusion and the thickness of the tape is preferably equivalent to pattern 602. Additionally, the pattern 922 provides a similar ratio of area of protrusions to the total area of the belt over a uniform area as pattern 602 (Figs. 6 & 7) . Thus, the same unexpected superiority as with belt 30a will be possible with a belt having the surface texture of belt 30b.
  • the belt of Fig. 1 can be formed, offering superior performance regarding maintaining constant tape tension at high speed and without quality control methods requiring expensive optical equipment, such as is the case with prior art microscopically rough surfaces.
  • a belt with a visible surface texture of raised plateaus in a predetermined pattern for preventing belt slippage and maintaining constant tape tension and a method of making the same has been shown.

Abstract

L'invention concerne une cassette à bande avec un entraînement par une courroie ayant une texture visible de plateaux en relief, suivant un motif prédéterminé, pour venir en contact avec la bande à entraîner. Cette texture empêche la courroie de glisser par rapport à la bande, en particulier aux vitesses élevées de la bande. La texture de la courroie peut être formée à l'aide d'un cylindre d'impression.
PCT/US1997/003139 1996-10-18 1997-02-28 Cassette a bande avec un entrainement par courroie amelioree pour diminuer le glissement a l'interface avec la bande WO1998018127A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20597/97A AU2059797A (en) 1996-10-18 1997-02-28 Belt-driven tape cartridge with improved belt for reducing slippage at tape interface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73451496A 1996-10-18 1996-10-18
US08/734,514 1996-10-18

Publications (1)

Publication Number Publication Date
WO1998018127A1 true WO1998018127A1 (fr) 1998-04-30

Family

ID=24951998

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/003139 WO1998018127A1 (fr) 1996-10-18 1997-02-28 Cassette a bande avec un entrainement par courroie amelioree pour diminuer le glissement a l'interface avec la bande

Country Status (2)

Country Link
AU (1) AU2059797A (fr)
WO (1) WO1998018127A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515778A (en) * 1967-03-02 1970-06-02 Du Pont Continuous molding of thermoplastic resin
US3692255A (en) * 1971-06-17 1972-09-19 Minnesota Mining & Mfg Belt driven tape cartridge
US4342809A (en) * 1980-06-24 1982-08-03 Newell Research Corporation High-friction, low-elasticity drive belt for tape cartridges
US4466564A (en) * 1981-09-14 1984-08-21 Minnesota Mining And Manufacturing Company Belt for belt-driven recording tape pack
US4581189A (en) * 1981-09-14 1986-04-08 Minnesota Mining And Manufacturing Company Method of making a belt for belt-driven recording tape pack
JPH04163776A (ja) * 1990-10-29 1992-06-09 Sony Corp テープカートリツジ
US5131891A (en) * 1991-02-04 1992-07-21 Gigatek Memory Systems Limited Partnership Highly durable tape cartridge drive belt
WO1992015990A1 (fr) * 1991-03-01 1992-09-17 Athana Incorporated Courroie d'entrainement de cartouche de bande a faible de rapport de frottement statique/dynamique
US5199660A (en) * 1992-04-02 1993-04-06 Minnesota Mining And Manufacturing Company Ribbed-belt for belt-driven tape pack
US5207962A (en) * 1991-06-25 1993-05-04 Applied Extrusion Technologies, Inc. Method of making apertured film fabrics
EP0579116A2 (fr) * 1992-07-13 1994-01-19 Minnesota Mining And Manufacturing Company Courroie d'entrainement pour cassette à bande magnétique
US5397072A (en) * 1992-08-12 1995-03-14 Minnesota Mining And Manufacturing Company Drive belt textured with bubble burst discontinuities for use in belt-driven recording tape cartridge

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515778A (en) * 1967-03-02 1970-06-02 Du Pont Continuous molding of thermoplastic resin
US3692255A (en) * 1971-06-17 1972-09-19 Minnesota Mining & Mfg Belt driven tape cartridge
US4342809A (en) * 1980-06-24 1982-08-03 Newell Research Corporation High-friction, low-elasticity drive belt for tape cartridges
US4466564A (en) * 1981-09-14 1984-08-21 Minnesota Mining And Manufacturing Company Belt for belt-driven recording tape pack
US4581189A (en) * 1981-09-14 1986-04-08 Minnesota Mining And Manufacturing Company Method of making a belt for belt-driven recording tape pack
JPH04163776A (ja) * 1990-10-29 1992-06-09 Sony Corp テープカートリツジ
US5131891A (en) * 1991-02-04 1992-07-21 Gigatek Memory Systems Limited Partnership Highly durable tape cartridge drive belt
WO1992015990A1 (fr) * 1991-03-01 1992-09-17 Athana Incorporated Courroie d'entrainement de cartouche de bande a faible de rapport de frottement statique/dynamique
US5207962A (en) * 1991-06-25 1993-05-04 Applied Extrusion Technologies, Inc. Method of making apertured film fabrics
US5199660A (en) * 1992-04-02 1993-04-06 Minnesota Mining And Manufacturing Company Ribbed-belt for belt-driven tape pack
EP0579116A2 (fr) * 1992-07-13 1994-01-19 Minnesota Mining And Manufacturing Company Courroie d'entrainement pour cassette à bande magnétique
US5397072A (en) * 1992-08-12 1995-03-14 Minnesota Mining And Manufacturing Company Drive belt textured with bubble burst discontinuities for use in belt-driven recording tape cartridge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 460 (P - 1427) 24 September 1992 (1992-09-24) *

Also Published As

Publication number Publication date
AU2059797A (en) 1998-05-15

Similar Documents

Publication Publication Date Title
EP1176884B1 (fr) Dispositif de fixation mecanique
US6562274B1 (en) Process of making biaxially oriented polyester films
EP0924050B1 (fr) Procédé pour la fabrication d'un film de polyester
US5589247A (en) Magnetic recording medium having an embossed backcoat layer
WO1981000558A1 (fr) Appareil d'enroulement d'une bande sur des noyaux
US4466564A (en) Belt for belt-driven recording tape pack
WO1998018127A1 (fr) Cassette a bande avec un entrainement par courroie amelioree pour diminuer le glissement a l'interface avec la bande
US4581189A (en) Method of making a belt for belt-driven recording tape pack
EP0084263A1 (fr) Méthode de fabrication d'une feuille de glissement de cassette
US5065548A (en) Surface treating tape cartridge and surface treating machine
US6045086A (en) Method and apparatus for improved tape packing
US5362009A (en) Drive belt corner guide roller with structured inner surface for a data cartridge
US5397072A (en) Drive belt textured with bubble burst discontinuities for use in belt-driven recording tape cartridge
US6033759A (en) Magnetic recording medium
JPH0981987A (ja) テープ駆動ベルトおよびベルト駆動式記録テープカートリッジ
JPH0664036A (ja) シンジオタクチックポリスチレン系二軸延伸フィルム
CN1230279A (zh) 降低磁带卷集形变的传动带驱动数据磁带盒
EP0768645B1 (fr) Procede de polissage superficiel d'un support d'enregistrement magnetique et appareil de polissage superficiel
US6203883B1 (en) Biaxially oriented laminated polyester film for magnetic recording medium
JPH06218842A (ja) 磁気テープカートリッジ用駆動ベルトおよび磁気テープアセンブリ
US6205000B1 (en) Composite data cartridge drive belt
JPH09293350A (ja) ベルト駆動式磁気記録媒体
US4562028A (en) Method for producing a bowed cassette shim
KR200141042Y1 (ko) 원통형 내부면을 구비한 안내로울러와 이를 장착한 벨트구동식 테이프 카트리지
CA1054708A (fr) Palier fluidique pour guide-ruban

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BR CA JP KR

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1998519320

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase