US3847454A - Translational motion apparatus - Google Patents

Translational motion apparatus Download PDF

Info

Publication number
US3847454A
US3847454A US00378096A US37809673A US3847454A US 3847454 A US3847454 A US 3847454A US 00378096 A US00378096 A US 00378096A US 37809673 A US37809673 A US 37809673A US 3847454 A US3847454 A US 3847454A
Authority
US
United States
Prior art keywords
rail
carriage
translational motion
motion apparatus
bearings
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00378096A
Other languages
English (en)
Inventor
I Pejcha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US00378096A priority Critical patent/US3847454A/en
Priority to JP49079731A priority patent/JPS5036035A/ja
Application granted granted Critical
Publication of US3847454A publication Critical patent/US3847454A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks

Definitions

  • a magnesium carriage of inverted-U cross-section having a flat top and two generally triangular sides rides on bearings along a rectangular aluminum rail
  • One of the sides of the rail includes a shoulder projection, the lower surface of which provides a running surface for a pre-load bearing that operates to distribute the total load among other bearings, two of which ride on top of the rail and three of which ride on the opposite side of the rail shoulder projection.
  • the carriage moves a structure supporting the reading heads of an information storage and retrieval system.
  • a partially hollow rectangular block of the same material as the rail supports the above-described structure.
  • the transducer or reading head In order to store a-large amount of information the transducer or reading head must place the information signal on a narrow track on'the disc surface. For this reason, a drive mechanism is required which will place a signal transducer quickly and accurately on a track. Ideally, the drive mechanism'should move the signal transducer linearly, quickly and accurately from the rest position to the narrow track where the information will be stored and from where it will later be retrieved. In practice, however, the movement may be twisted, full of vibrations and overrun-the narrow track. These undesirable movements may result from one or more of Y directions,.thus assuring a linear, vibration-free ride for-thecarriage. Fourth, the magnesium carriage is light-weight, strong, rigid, and requires little power to move and position accurately. Fifth, the carriage has a symmetrical design and substantially embraces the rail,
  • the present invention employs an aluminum base block and an aluminum rail for supporting a magnesium carriage which transports a signal transducer structure, and also includes means formovingthe carriage on the rail.
  • the base is a partially hollow block.
  • the rail is a rectangular blocksuppor ted by mounting flanges and includes a precisely flat rectangular top, and two precisely flatrectangular sides,.one of which has, however, a shoulder projection tilted atanangle.
  • the sides and top of the rail provide running surfaces for bearings supporting a carriage. Twoof these bearings ride on top of the rail three on one of the sides, and one on the lower surface of the shoulderprojection.
  • the carriage comprises a flat rectangular top and two vertical sides of generally triangular-shape. These three sides present an inverted-U cross-section from an end view.
  • the carriage is supportedbybearings of which three are attachedto one-ofthesetriangular sides, two are attached to the carriage top, and one, called apreload bearing, is attached 'toan extension arm of the other carriage side.
  • FIG. 1 is a view of the base block and of the rail.
  • FIG. 2 is an end view of the base block and the carriage.
  • FIG. 3 is aview of the carriage and one of its sides.
  • FIG. 4 is a view of the slanted carriage side and of the pre-load bearing arm.
  • FlG.-5. is a view of thepre-load bearing armshowing the eccentric postandithe arm spring.
  • FIG.- 6 is a view of the voice .coil assembly and magnet.
  • the bas e blockl0 is, an aluminum rectangular blockhavjng two equal internal elliptical cavities 11 disposed along the longitudinal axis of the base plate.
  • the top horizontal-surface 13 of the base block has a short dowel hole 14 in the middle and ten additional holes 15 distributed in two lines of five, each line to the side of and/equidistant from thecentral axis.
  • the rectangular rail 20 is made of aluminum and has a shoulder projection '28 on one side and mounting flanges 22 on both sides.
  • a dowel .pin passes through dowel hole 25 located in the middleof the lower surface of the rail and also through the dowelhole 14 located in the base block.
  • Such flanges may be extensionsof the lower portion of the rail.
  • Shims 26 of different thicknesses placed under either side of the rail ,flanges angularly align a head supporting structure attached tothe carriage withthe', base block. In this manner,-.on alignmentonly the railflanges deflect .whilethe rail top'remains flat.
  • Shims 26 placed between thebaseblockand the .rail are employed to .avoid'using largedeforming forces when fasteningthe -row.tolerances for smooth accurateoperation of the apparatus.
  • the top flatness should be 0.000050 in.
  • thesideflatness shouldbe 0.0001 in.
  • the rail shoulder projection 28 is located along the rail, approximately in the middle of the rail side, and is slanted at an angle. This angle is the same as the angle between a horizontal line and the resultant of forces P and F, where P is the resultant of the forces exerted by the side bearing of the carriage on the rail side, and F is the resultant of the forces exerted by the top bearings of the carriage on the rail top.
  • the magnesium carriage 40 substantially embraces the rail with its rectangular top 41 and two triangular sides 42 and 43.
  • a slot 32 At each end of the central axis of the carriage top 41, there is a slot 32 in which a bearing 33 is disposed to turn on an axle and ride on the rail top as well as share the load equally with the other bearing in the carriage top.
  • the top of the carriage also includes two bolt holes 46 disposed along the central axis and one bolt hole 47 near each corner of the carriage rear section 48. All of these holes receive bolts to fasten the carriage to a structure 60 that supports signal transducers.
  • the first triangular carriage side 42 has on each corner an axle on which a bearing 34 is disposed to turn and ride on the rectangular rail side, and to share the load equally.
  • the second carriage side 43 slants away from the rail vertical side to form a projection 54 supporting an arm 55 which carries a pre-load bearing 56 on its lower surface.
  • This pre-load bearing 56 is disposed to ride on the lower side 29 of the rail shoulder projection 28.
  • Arm 55 pivots about a post 57 attached to the carriage projection 54 and passing through an eccentric point in the race 58 of pre-load bearing 56.
  • a spring 59 located in a cavity in arm 55 pushes this arm away from the carriage projection 54, thus producing a pre-loading force for bearing 56.
  • the arrangement of bearings on top and on the first and second sides of the carriage provide stability, rigidity and vibrationless motion to the carriage. While the bearings on vthe top 41 and on the first triangular side 42 equally share the load in their respective sides, the pre-load bearing 56 insures that all bearings ride linearly and vibrationlessly. Furthermore, the carriage having an inverted-U cross-section and embracing .a rail of simple rectangular configuration provides a combination of rail and carriage with the structural strength and rigidity of an ideal beam.
  • an arm support structure 60 supporting the signal transducer, i.e. read and write heads, which transfer information signals to and from the surface of a storage magnetic disc.
  • the light-weight carriage 40 can be accelerated rapidly and easily controlled by an electro-magnetic actuator which includes a signal coil 61, attached to the back of the arm support structure 60, and a magnet 62.
  • the coil moves within a cylindrical gap 63 which exists between the cylindrical center pole piece 64 and the magnet core 62.
  • a current drive signal applied to the coil reacts with the magnetic field perpendicularly oriented across the gap to produce a force perpendicular to the direction of flow of the current and to the magnetic field.
  • The'magnitude and direction of this force can be servo controlled to move the coil and, in turn, the carriage and associated signal transducers over the information storage surface of a disc in a conventional manner.
  • Translational motion apparatus comprising:
  • one of the sides of the rail including a shoulder projection and the other side and the top being substantially planar, said rail being attached to the base by mounting flanges;
  • a symmetrical carriage having two opposed sides and a top oriented about said rail in substantially inverted-U cross-section;
  • moving means for positioning the carriage along the rail.
  • a translational motion apparatus as in claim 6 wherein the race of the pre-load bearing supported by the arm has a post passing through it at a point eccentric to the race, said post being attached to the carriage to serve as a fulcrum for the arm.
  • a translational motion apparatus as in claim 9 wherein a spring located on the end of the arm opposite to the pre-load bearing and in engagement with the arm and the carriage provides the compressive force acting on the pre-load bearing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moving Of Heads (AREA)
US00378096A 1973-07-11 1973-07-11 Translational motion apparatus Expired - Lifetime US3847454A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US00378096A US3847454A (en) 1973-07-11 1973-07-11 Translational motion apparatus
JP49079731A JPS5036035A (enrdf_load_stackoverflow) 1973-07-11 1974-07-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00378096A US3847454A (en) 1973-07-11 1973-07-11 Translational motion apparatus

Publications (1)

Publication Number Publication Date
US3847454A true US3847454A (en) 1974-11-12

Family

ID=23491693

Family Applications (1)

Application Number Title Priority Date Filing Date
US00378096A Expired - Lifetime US3847454A (en) 1973-07-11 1973-07-11 Translational motion apparatus

Country Status (2)

Country Link
US (1) US3847454A (enrdf_load_stackoverflow)
JP (1) JPS5036035A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222461A (en) * 1977-04-19 1980-09-16 Masyc Ag Conveying system with a driven reciprocating load-holding device which is guided in a hollow column
EP0180658A1 (de) * 1984-11-07 1986-05-14 BASF Aktiengesellschaft Vorrichtung zum Positionieren von Gegenständen geringer Masse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582295C (de) * 1931-02-15 1933-08-12 Magdeburger Werkzeugmaschinenf Spaeneschutz fuer Drehbaenke, Revolverbaenke und aehnliche Werkzeugmaschinen
US2522695A (en) * 1946-11-12 1950-09-19 Gray & Co G A Machine tool guide
CH277762A (de) * 1949-08-11 1951-09-15 Bilek Anton Schlittenführung für Bearbeitungsmaschinen.
US3366426A (en) * 1964-01-31 1968-01-30 Wenczler & Heidenhain Alignment guide
US3526938A (en) * 1966-09-13 1970-09-08 Oerlikon Buehrle Holding Ag Machine tool
US4880673A (en) * 1986-03-27 1989-11-14 Bayer Aktiengesellschaft Acrylate binder and its use for dressing leather

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721967A (en) * 1971-08-02 1973-03-20 Ibm Head carriage assembly for magnetic disk storage drive

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582295C (de) * 1931-02-15 1933-08-12 Magdeburger Werkzeugmaschinenf Spaeneschutz fuer Drehbaenke, Revolverbaenke und aehnliche Werkzeugmaschinen
US2522695A (en) * 1946-11-12 1950-09-19 Gray & Co G A Machine tool guide
CH277762A (de) * 1949-08-11 1951-09-15 Bilek Anton Schlittenführung für Bearbeitungsmaschinen.
US3366426A (en) * 1964-01-31 1968-01-30 Wenczler & Heidenhain Alignment guide
US3526938A (en) * 1966-09-13 1970-09-08 Oerlikon Buehrle Holding Ag Machine tool
US4880673A (en) * 1986-03-27 1989-11-14 Bayer Aktiengesellschaft Acrylate binder and its use for dressing leather

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222461A (en) * 1977-04-19 1980-09-16 Masyc Ag Conveying system with a driven reciprocating load-holding device which is guided in a hollow column
EP0180658A1 (de) * 1984-11-07 1986-05-14 BASF Aktiengesellschaft Vorrichtung zum Positionieren von Gegenständen geringer Masse

Also Published As

Publication number Publication date
JPS5036035A (enrdf_load_stackoverflow) 1975-04-04

Similar Documents

Publication Publication Date Title
US4247794A (en) Linear actuator
US4196456A (en) Magnetic head pivotal support with compact drive means
US5184265A (en) Magnetic head suspension assembly in a disk drive
US3643242A (en) Transducer displacement control in movable head-type storage disk systems
US4613962A (en) Tracking device with linear motor
CA1187604A (en) Swing-arm device for an optical scanning unit
US3666977A (en) Linear positioner
US4415941A (en) Linear actuator for memory storage device
US5138605A (en) Low-profile radial access mechanism for disk recording/playback apparatus, with optical head mounted on a carriage
US4994931A (en) Actuator structure for a magnetic head suspension assembly in a disk drive
US5050026A (en) Vertical flat coil for head actuator
JPS62208439A (ja) 光電装置
US3847454A (en) Translational motion apparatus
KR930011446B1 (ko) 트랜스듀우서 구동장치
JPS6211429B2 (enrdf_load_stackoverflow)
US3838455A (en) Head carriage assembly for magnetic disk storage apparatus
CA2021359C (en) Magnetic head suspension assembly in a disk drive
JPS58211363A (ja) キヤリツジ組立体
JPH05334697A (ja) 光ピックアップ対物レンズの駆動装置
JPS61280037A (ja) 光学ピツクアツプ駆動装置
JPS626866Y2 (enrdf_load_stackoverflow)
JPH0823976B2 (ja) 磁気記録再生装置
JPH0685263B2 (ja) 走行体の支持機構
JPH03209673A (ja) ロータリアクチュエータ
JPS60108244A (ja) 駆動装置