DE1774204A1 - Magnetic head feed device - Google Patents

Description

Patent attorney *

177 A

. 8l-! 3.466P May 11, 1970

1! 4TSUSBICA SEECTBIO IUfflSTBIAL 00 ·, LTD., Osaka (Japan)

Magnetic head advance device

The invention relates to a magnetic reading and reproducing device in which a rotating object, v / ie e.g. a rotating i'romnel or 3cheibo No. with a magnetic material attached to its surface, rotates at high speed and a magnetic head rotates with interruptions or continuously is gradually moved further in contact with the surface of the magnetic material in order to effect storage or reproduction, and it relates in particular to a magnetite op f-advance device for a similar magnetic recording and reproducing device, which is so constructed that when the magnetic head is moved one end to the other of the magnetic material by means of a pulling mechanism or a step conveyor mechanism (in the case of the rotary disc type, the head is moved radially to the disc, in the case of

01- (Poe.13975) -TpGr (0)

00a840 / 1895

BAO ORIGINAL

tiorzylindertyp he is parallel to the rotation axis ", however, the cylinder moves), vm to effect recording or reproduction, the fast and Ilagnetkopf ßenaii zut of the Auclaufendstellung or any intermediate position Starting position of the movement is euriickgeführt.

In an attempt to move a magnetic head on a magnetic material from one end to the other, one can generally envisage either a screw or step lock mechanism, such as, for example. to use a ratache mechanism. In the case of a screw spindle mechanism, for example, it is possible to run the riagnet head along the tracks previously recorded by the head without fail, if a screw spindle and a magnetic head supporting f? E-Yvlndebucb.se are kept constantly in mutual engagement with each other. With such an approach, however, it is necessary that, when the magnetic head is to be returned from the end position to the end position, the screw spindle is rotated in reverse, in order to gradually return the head to the starting position. required to make this displacement of the magnetic head. In a Versuoh aur abbreviation of the head

009840/1695

BAD ORIQiNAL

At the same time, it is also conceivable to use a semi-structural or partial hollow spindle as a screw spindle and release the screw from the screw handle on the auxiliary spindle so that the magnetic head is connected to the starting spindle. With such an arrangement i'-t ca? .N-

It is necessary that, if the Cev / indebuch. ^ rnen with the Hacnetkopf to the starting position, oie again in the control mic with the screw ep ind el into engagement, v / o their threads -before engagement. / inflcrnfalla \ it becomes impossible to hit the previously recorded tracks gonniv bu, since tale · lung achlers occur. In addition, it is necessary that the threads and beginnings of these screws are not aligned with one another. Otherwise the thread would be splitted,

The invention is based on the object mentioned To solve problems. Task of the invention i ^ i3t β β So, the return of a magnetic head from de? luidatel- " ment or an intermediate position for the start position of the Head movement detected in a short time. Thereby aoll it will be possible to do this repatriation automatically and quickly perform an accurate re-intervention of the Ilagnetkopfo nit the Vorachubmechanicuauo au enable the canceled during repatriation

009840/1695

BATH ORIGINAL

3) This object is achieved according to the invention by a magnetic head torch device which is characterized by guide elements for guiding a head holder with a magnetic head attached to it via a magnetic head attached to a rotating object such as a disk, cylinder or the like while touching this Materials through the magnetic head, a drive element in conjunction with the head holder, which is lined up for releasable engagement with a head feed spindle, a return device that zoararaen on the head holder with the anti'iebaorgan constantly emits a force that drives it to the position ,

iin.ä Kin ^ riff control means, which the drive organ depending on Vi'unach in or also the engagement with the head voyage-ochübcpindel bring.

The invention is illustrated with reference to the in the drawing Execution examples explained in more detail. Show it:

Fig. 1 is a perspective view not an exemplary embodiment the Lia ^ etkopf-Vorcchubeinrichtung according to the invention;

Fig. 2 is a side view of such a device after a *, second Auofführungobeicpiel the Invention;

.Pig. 3 shows an example of a recording track in the magnetic material with the help of the facility according to the Invention; and

009840/1695

BAD ORlQfNAl.

Pig. 4 is a diagram for explaining the reproduction of the / aifzeichmmgsopur according to FIG. 3.

In Fig. 1, the reference number 1 denotes a magnet material on a rotating disk 2. A head holder 5 is arranged above the Tlagnetmaterial, which is loosely supported by guide rods 3 and 4, so that it can be moved parallel to the surface of the ISagnetraaterials 1. the Bezugsaiffer, 6 denotes a magnetic head which is provided in the VeIee at the upstream end portion thereof dea% Kopfhaltera 5 that it touches daa magnetic material. 1 The displacement of the head holder 5 results in a radial movement of the Iiagnet head 6 over the magnetic material 1. The reference number 7 denotes a drive element which is provided separately on the opposite side to the advance direction of the head holder 5 for pressing the latter. The drive element is carried by the guide rod 4 in a conductive manner and is suitable for rotation around this rod The reference number O represents a threaded half-sleeve which is suitable for engagement with a screw spindle 9 ', which extends over the magnetic material 1 parallel to the guide rods and 4 arranged iat. The head holder 5 lies above the feed screw spindle 9 and is not in engagement or is arranged to be released from engagement with the screw spindle 9. The reference number 10 denotes a tension spring which is connected between the head holder 5 and the drive element 7.

0098AO / 169 5

BADORIG »^ ,.

'■ - ■■' ■ '. ■'. ■■■ ■ '&

177A2CK

is arranged to actuate the drive member 7 in a rotating manner and to bring about the engagement of the threaded half-bushes 8 with the feed slide pin 9; 11 denotes a head holder return spring, which pulls the head holder 5 in the opposite direction to the feed direction, and 12 a return rod which is arranged above the Ilagnetmateriala T parallel to the guide rods 3 and 4 and is normally positioned under the head holder 5 and the drive element 7. The rod 12 is arranged so that it is moved either up or down by means of a solenoid 14 which is actuated by an end position switch 13 which is switched by being pushed through the Koyfli filter or moved by hand. ird, where the switch 13 is not used, so that a Voropx "Rg 7a is pressed upwards, which is arranged on the lower surface of the drive member 7, whereby this rotates around the guide rod 4 and the threaded sleeve 8 out of engagement with the feed screw spindle 9. The reference number 15 denotes an otartstellunge-lvrfassun (j39Ciialter, which is operated by pressing down a switch actuating plate 16 on the drive member 7, and the reference number 17 a switch for detecting the angle of rotation of the feed _{screw spindle 9 t} by pressing is operated by means of a switch actuation plate 18, which allows the feed screw 9 * to rotate.

0098AO / t895

BATH

directs l3t. In a similar arrangement, the pot holder is 5 _t when the Yoreohubechraubopindel 9 is threatened in jifoataen or continuously on the left, the Gevrindehalbuctiee 8 vä'rrancl the Gevrindehalbuctiee 8 the drive so rgan a 7 held in injriif with the Feedcchranbopindel 9 τ / ird, your drive mechanism 7 is fixed in order to advance near and after in the direction roped up by an arrow A against the tension force of the tension spring 11, so that signals from magnetic head 6 are recorded concentrically or spirally on the TtaGnctraaterial 1 ^ j. At the end of the recording switch is 13 actuated by pressing down by means of the Kopfhaltera 5, Dafi eo the solenoid coil 14 a, ^r; is eschaltet and the rod 12 NaOH moved above, followed dao drive member 7 iin dan PUhrungeirkab A rotated unfl the Gev / indehalbbuchae 8 au β dea intervention old the Vorechubnchrauhapiiidel 9 is brought. Thus, the case holder 5 and the drive element 7 are brought back to the starting position by the tensioning force of the tensioning spring 11, regardless of the positions of the thread or the beginnings of the screws. In addition, an electric current is set so that the fact that the head holder 5 or the drive element 7 is retrieved from the original position is detected by the switch 15 detecting the start position being actuated by the holder actuation plate 16 provided on the drive element 7 , or eo that the YorechubBChrctttbBfpindel 9 is brought to τ / pus rotation

009840/1695

BATH ORIGINAL

is, while the winch halfway 8 accepts the 3tortotelluttg outside of the engagement with the advance screw pin oil 9 · If eioh the gate screw spindle 9 under oolohen conditions xua rotates a small angle, throw the switch 17 that detects the raw angle ·! 18 actuated. A signal is determined by the Sotoal · ter 15 given by forming a UHD Kreieea by the switches 15 and 17, which indicates the fact that the _r iet been! LASS · ηε-T head returned to its TJraprun ^ sotellung »·. cnn an oolchea signal from switch 1 $ rerftlgbar iet, rotates ;, the Voroohubsohrauböpindel 9 _t and from the switch 17 eor detection of the Hotationsninkela the Voroohubsohraubepindel 9 a .Signal is emitted. Bo t; ird by switching off the magnetic coil 14 for the purpose of occupying the rod 12 downwards, when the signals from the switches 1? and 17 are released, the Gowindeholbbuchae 8 dee Antriebeorgaii8 ^ü 7 * »are brought back into engagement rait of the pre-lifting screw spindle 9 · The '.r'indungen and beginnings of the Gomindehalbbbuchae 8 can be arranged in an exact passport division with those of the Vorachubeohraubapindel 9,' by the The adjustment angle of the holder actuation plate 18 is suitably adjusted with respect to the axis of the Vorachubeohrspindel 9, but under the obl & ni 7) e ~ conditions the linear head 6 has not yet assumed the initial recording start position. ^ r

009840/1695

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Thereafter, the threaded half-beech 8 doe drive organa is gradually moved by the rotation of the Vorsohubaohraubopindel 9 in the seal indicated by the arrow A, while it is held in engagement position with the spindle 9 Switch 15 is turned off. By such a construction that the feed screw 9 is stopped in its rotation at this point, it is possible to hold the head holder 5 and the drive element 7 where the Üa & ietkopf 6 in the initial recording. Starting position lot.

Although in the foregoing there has been an erosion of the case QQBban , in which the magnate's head is transported by ending the spindle neohoniamua, ee is also Qöglioh, the glaioha irkuna by using a stepaohaltmeohaniaauB, like ι · Β · a · «Rnteohanmeohanmeohanie

erhiohen, the one Hataoha 19 (? lg * 2) that replaces the. “;

VorBChubsohraubspindel 9 provided iat, as well as drive aait-

· ■ "■ ··. · ■■ ■ ■ ·

tel including an · Eincriffsorgana 20, which * ue ■■■■ -.... Intervention «1t dar llataoha 19 auegestaltet iat, and a \

21 for driving the organ 20 includes rider;

in the previous example the construction was create that the Ilngnetköpfe 6 from the Aufeoiohnunge'ena-. "

position your starting position with the help of the Snderfassunss * ♦ · · '· ι

schaltera 1? and the magnet coil 14 automntioob zurUekge- ^

009S40 / 169S

BATH ORIGINAL

- ίο -

In the meantime, it is also suitable that an aeon switch 13 corresponding to the Mohalter is displayed separately, by means of which the magnetic pulse 14, when it is unsuccessful, switches around the rod 12 in such a way that the! say no 6 can be retrieved from any position where your location can be · floodplains in these?

From what has been said above, * that after the invention the? Lassnet head swa & gslRufig and quickly brought back from any rock to the starting position and tracking errors as a result of division of the screws or cream of the ratchet can be reduced to a large extent »· In addition, there is the head holder the deceiving the -Inßaetkopf is vorgeapannt means of the spring always ICUR in opposite direction Vorsohubrioatung *, mößlich suppress the dead Oang the Voraohubstellung tu, oo that an accurate P feed is eraielt, rider t / ird according 6ET Ktiin-

dung the drive organ for '' borrowing a drive force go to the head holder separately from the head holder, so that, call the drive orssoa diuroh the Yorsohubeinrlohtuni. upwards or wait, it doesn’t affect the feedback, it is possible to carry out recording and playback processes in a satisfactory manner.

0098AO / 1695

ORIGINAL BATHROOM

Woi the voretchendea arrangement iat co possible under in paragraphs !! Move the magnetic head recordings concentrically to collect a »cylindrical or 3oheibenähnlichon recording material. During the operation, it is necessary to move the playback head from a certain recording track to another Aufnshmespxtr a © to avoid distortion

Sa is customary to rotate the Aufzelchnungaraßäiuui and ^ dsn .iedorgabekopf radially initially recording material to BEV / cßen when ircendoine (jcwUnechte recording are wiederßegeben of Ironzcntricchen recording zones eoll. Here, EA is possible to Langeainbev7egungBbild zvonc-nlllxitlz easy thereby to generate that The speed of movement of the playback head is never lower than that of the recording head. It is also possible to generate measurement images or a still image simply by reducing the speed of movement of the playback head or by stopping the head

Therefore, this type of recording and reproducing device is widely used in the field of X-ray photography and in other recording and reproducing devices.Because all recording tracks are produced concentrically, the playback gob always passes through a non-safe zone when it closes from a recording zone

0098

BATH ORIGINAL

17T4204

another such zone is moved. This results in an overlay ¹ or noise zone. According to the invention, such an overlay zone is kept very small, eo. that little or no distortion occurs as the playback head travels from a recording zone to its recording zone. To this ftjteek wind '/ the track width doe headea as narrow as half of the division between adjoining Aufselchungszone maue »Ba eoli :'. V

a description will now be given in detail, "* ... · _ι?, ^r · never the track width of the playback head is determined",%> Venn in Fig. 3 the track width of a head for recording ·,

and Vfied would result in signals a and the width of the distances β between ^;

'"' i see the display zones A ₄ and A ₉ b lot, becomes the · gate». ·

ι £ ■ - -,

Division of the recording and playback headers (a. # - b)

should the pail be considered that the \ -iedergabe- · '

head at a uniform speed from the Aufzelob- '. / J '

tion zone A _{1 is moved} to recording _{zone A 2} «The calibration ^. '·'»'(

Ψ resulting position of the head movement int in Pig. 5 duroh '*' dashed lines indicated.

The ratio G of the time period during which the playback head is in contact with only one of the recording * ·· zones A ₁ and A ₂ to give signals from these wleä + rzp ^ · '* ... to the time period during the record «- ^ · ^ ^! !

material executes one revolution, iot given by the . <· «· 'equation · *'"",

009840/1695.

BATH ORIGINAL ^ί

¹ G '

On the other hand, the ratio of the period for the transmission of the zone in which signals from both. Aufseicftnungs zones Aj and A _{2 are} reproduced, or those during the signals from. none of these zones can be reproduced yu the period of time required for one rotation of the recording material, by the equation

»♦ Φ

reproduce.

From these two equations it follows that a Cr Haxiaalwert and H reaches a Ilinimalwert when a »b. 3? I £. 4 shows such conditions, where G becomes maximal and K minimal I if b / a β 1 let *.,

By defining the width of each straightening zone or the track width of the recording and playback head to half of the above-described feed division Head, the superimposition and / or noise zone can essentially be reduced to zero, so that aich ateto one stable reproduction can be achieved «

009840/1695

BATH ORIGINAL

1774 * 04

In FIg. 4 means N with b / a> 1 noise and with O < b / a <1 beat. On Orund it was established from the test results that when importing raw audio components In, reproduced signals are noticeably impaired and synchronizing signals are mowed turbulently, while when introducing beat components In, reproduced signals are sometimes beating in an image. Thus, when b / a is not greater than 1, the turbulence of an image that may be caused when the magnetic head is moved from one track to another is small. When b / a is 1, 0 is equal to N. -

TpH (6)

009840/1696

BATH ORIGINAL

Claims (1)

. :! Patent claims 1 magnetic head torachub device, characterized by Guide elements (3, 4) cur guide a head holder (5) old eleventh feet attached to it Ifegnetkopf (6) over one on a rotating Gogenetand, never Koheibe (2), ZyIInder od «dfjl · applied Ungnetaaterlal (1) under Bertlhrunf theeaee Mnteriala through the magnetic head, ^ A drive aorcan (7) Xn touch old the head holder, the eum detachable Elnßrlff. old of a headframe hub (9) set up 1st,. - _{ . a RUokholiaittel (11) that is put together on the head holder A force was constantly exerted on the driving organ, which it schtarteinetellunß drives, and engagement control means (10, 12) which, depending on the requirements, move the drive organ into or out of engagement with the Brincen head-toe bundle. 2. Vorachubeinrichtune naoh claim 1, further characterized, duroh »In Eur Betatlgune by means of TTlederdrUckens through switching element (13) set up for the head restraint (5) when it arrives at the outlet end and a switch (14) fed by this switching element for actuating the engagement device (12) in the The purpose of releasing the engagement of the drive element (7) with the head feed spindle (9) 008040/1695 BATH ORIGINAL 3 · Feed device according to claim 1 «further characterized by a first detector unit (15, 16) for Detecting the return of the head holder (5) and the drive member (7) # which are controlled by the engagement control means (12) have been released from the head feed spindle (9) and brought back to the start end position by the return means (11), in a certain position, a second detector unit (17, 18) for detecting the angle of rotation of the head feed spindle rod (9) and means for bringing the drive member (7) into engagement with the head feed spindle rod (9) with tripping through the two detector units when the head feed spindle rod assumes a certain phase of rotation 4. Feed device according to claim 1, characterized in that the head feed spindle (9) and the drive member (7) are dimensioned such that the ratio of the distance (b) between adjacent magnetic storage tracks (A ₁ and A ₉ ) ^w to the track width (a) of the head is not greater than 1 if a signal of at least one field is recorded concentrically on the disk-like or cylindrical magnetic material (1). TpH (6) 009840/1695 BATH ORIGINAL Blank page