Patent EP0071381A2 successfully refreshed from Google Patents.
EP0071381A2
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Magnetic disc drive unit
Assignee: Olivetti SpA
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Filing: 1982-07-19
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Granted: —
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Expires: 2002-07-19
Abstract
Abstract A carriage 19 is moved on guides 21, 22 by a stepping motor 40 to position a head 18 along a line 20 which is radial with respect to the mandrel of the disc drive. The motor is coupled to the carriage by flexible steel tapes 42 and 43 anchored at first ends to a boss 44 on the motor shaft 41 and doubling back through 180° over respective rollers 70, 73 journalled on the carriage. The roller 70 is on a precision bearing and the second end 48 of the corresponding strip 42 is anchored to a fixed point while the second end of the other strip is attached to a tensioning spring 59 so that only the roller 70 determines the carriage movement, this being half the strip movement for finer carriage positioning. There is also described an improved floppy disc centering arrangement wherein a counter-mandrel has a centering boss which is inserted through the hole in the disc into a cavity in the mandrel and slides axially on the counter-mandrel. A resilient ring compressed between the sliding boss and the counter-mandrel spreads fingers of the sliding boss into contact with the edge of the disc hole.
Inventors
- 👤 Guiseppe Bettini
- 👤 Sergio Tronzano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:01
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0284; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
113 words
A magnetic disc drive unit comprising a base in which is journalled a rotatable mandrel for supporting a magnetic disc, a carriage carrying at least one magnetic head and a motor for moving the carriage on the base radially with respect to the mandrel and wherein the movement of the carriage is effected by way of a flexible member having one end connected to the shaft of the motor, characterised in that the flexible member (42,43) is connected to the carriage (19) by means of a movable pulley device (55,65 or 76,73) which steps down the movements of the carriage with respect to those imposed by the shaft (41) of the motor (40).
Claim 2
Dependent Claim
113 words
A magnetic disc drive unit comprising a base in which is journalled a rotatable mandrel for supporting a magnetic disc, a carriage carrying at least one magnetic head and a motor for moving the carriage on the base radially with respect to the mandrel and wherein the movement of the carriage is effected by way of a flexible member having one end connected to the shaft of the motor, characterised in that the flexible member (42,43) is connected to the carriage (19) by means of a movable pulley device (55,65 or 76,73) which steps down the movements of the carriage with respect to those imposed by the shaft (41) of the motor (40).
Claim 3
Dependent Claim
96 words
A unit according to claim 1, characterised in that the flexible member comprises two flexible strips (42 and 43), each of which has a first end (45,46) fixed to a boss (44) on the shaft (41) of the motor (40) and a second end (48,58) connected to a part (10) which is fixed with respect to the motor, and in that the movable pulley device comprises a pair of direction-changing members (55,65 or 70,73) supported by the carriage (19) and in that each strip (42,43) is wound partially around a corresponding direction-changing member of the pair.
Claim 4
Dependent Claim
22 words
A unit according to claim 2, characterised in that the direction-changing members (55,65 or 70,73) are mounted rotatably on the carriage (19).
Claim 5
Dependent Claim
55 words
A unit according to claim 3, characterised in that the direction-changing members (55 and 65) are mounted coaxially with respect to each other on a pivot (56) on the :carriage (19) and one of the two strips (43) is also wound partially around a direction-changing roller (62) which is rotatable about a fixed pivot (63).
Claim 6
Dependent Claim
82 words
A unit according to claim 3, characterised in that the full stroke of the carriage (19) is produced by a rotary movement of the boss (44) which is not greater than one complete revolution, and in that each strip (42,43) runs directly from the boss of the motor shaft (41) to a corresponding direction-changing member (70,73), and the direction-changing members rotate about two parallel axes (71,74) disposed at a mutual spacing which is substantially greater than the full stroke of the carriage.
Claim 7
Dependent Claim
95 words
A unit according to any of claims 3 to 5, characterised in that a first one of the direction-changing members comprises a precision rolling bearing (55 or 70) mounted rotatably on the carriage (19) and around which a first strip (42) of the pair is wound, and in that a play take-up element (59) is connected between the second end (58) of the second strip (43) and the corresponding fixed part (60), for precise positioning of the carriage with respect to the fixed part (51) anchoring the second end (48) of the first strip (42).
Claim 8
Dependent Claim
36 words
A unit according to claim 6, characterised in that the play take-up element comprises a spring (59) which is tensioned between the second end (58) of the second strip (43) and the corresponding fixed part (60).
Claim 9
Dependent Claim
24 words
A unit according to claim 6 or 7, characterised in that the rolling bearing is of the ball bearing, roller bearing or like type.
Claim 10
Dependent Claim
35 words
A unit according to any of claims 2 to 6, characterised in that a spring (59) is tensioned between one of the second ends of the flexible strips (42,43) and the corresponding fixed part (60).
Claim 11
Dependent Claim
55 words
A unit according to any of claims 2 to 9, characterised in that an adjusting element (49) is interposed between one of the second ends of the flexible strips (42,43) and the corresponding fixed part, (51), the adjusting element being slidable under the control of a screw (51) with respect to the said fixed part.
Claim 12
Dependent Claim
41 words
A unit according to claims 9 and 10, characterised in that the second ends (48,58) of the two strips (42,43) are connected to the base (10) by way of the adjusting element (49) and by way of the spring (59) respectively.
Claim 13
Dependent Claim
43 words
A unit according to claims 6 and 11, characterised in that the second end (48) of the first strip (42) is fixed to the adjusting member (49) and the second end (58) of the second strip (43) is fixed to the spring (59).
Claim 14
Dependent Claim
154 words
A magnetic disc drive unit comprising two drive members, namely a mandrel and a coaxial counter-mandrel, which are operable to clamp an inner peripheral zone of a disc with a central hole, characterised in that a first one (11) of the drive members has a cavity (94) and the second drive member (87) has a centering element (83) which is provided with a plurality of radial segments (92) and which is capable of being inserted through the hole in the disc into the cavity of the first drive member, a resilient element (93) being interposed between the centering element (83) and the second drive member (81), and a counter-acting surface (95) being movable axially with respect to the second member for deforming the resilient element (93) so as thereby to spread the said segments (92) radially into a condition of engagement with the said hole, for centering the disc with respect to the mandrel.
Claim 15
Dependent Claim
154 words
A magnetic disc drive unit comprising two drive members, namely a mandrel and a coaxial counter-mandrel, which are operable to clamp an inner peripheral zone of a disc with a central hole, characterised in that a first one (11) of the drive members has a cavity (94) and the second drive member (87) has a centering element (83) which is provided with a plurality of radial segments (92) and which is capable of being inserted through the hole in the disc into the cavity of the first drive member, a resilient element (93) being interposed between the centering element (83) and the second drive member (81), and a counter-acting surface (95) being movable axially with respect to the second member for deforming the resilient element (93) so as thereby to spread the said segments (92) radially into a condition of engagement with the said hole, for centering the disc with respect to the mandrel.
Claim 16
Dependent Claim
31 words
A unit according to claim 13, characterised in that said counter-acting surface (95) is carried by the centering element (83) which is movable axially with respect to the second member (81).
Claim 17
Dependent Claim
19 words
A unit according to claim 13 or 14, characterised in that the resilient element comprises a rubber ring (93).
Claim 18
Dependent Claim
34 words
A unit according to claims 14 and 15, characterised in that the rubber ring (93) is inserted between two annular seats (95,85) on the centering element (83) and the second drive member (81) respectively.
Claim 19
Dependent Claim
31 words
A unit according to claim 16, characterised in that the ring (93) is of substantially V-shaped cross-section, the vertical apex co-operating with the radially inner sides of the said segments (92).
Claim 20
Dependent Claim
40 words
A unit according to any of claims 13 to 17, characterised in that the centering element (83) has a frustoconical body portion (91) and the radial segments (92) are disposed at the larger cross section of the frustoconical body portion.
Claim 21
Dependent Claim
43 words
A unit according to claims 17 and 18, characterised in that the segments (92) are formed by resilient portions which project from the body portion (91) and which internally define the annular seat and the counter-acting surface (95) of the centering element (83).
Claim 22
Dependent Claim
44 words
A unit according to any of claims 13 to 19, characterised in that the first drive member is the drive mandrel (11) which is axially fixed and the second drive member is the counter-mandrel (81) which moves axially with respect to the drive mandrel.
References Cited (Backward Citations)
No citation records indexed.
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