DE2428154A1 - TONFILM TRANSPORT SPEED CONTROL DEVICE - Google Patents

Description

PATENT LAWYERS

DIPL-INe-CURTWALLACH β Munich?,

niDi IM « ßnwTMPP vcnr> \ A 'kaufingerstrasse β

DIPL-ΙΝΘ. GÜNTHER KOCH phone 240275

DR. TINO HAIBACH telex 5-29513 wakai d

Λ 65 *

Polaroid Corporation Cambridge, Masaaohutetts / USA

Sound film ^ Transport speed control direction

The invention relates sioh to the sound film technology and especially special on a control device to control the transport = speed of a sound film »

A long-known problem with recording and replaying » would be of sound films «in which a sound track together with the photographic recordings are recorded "consists of" that the sound must be recorded and reproduced at the same uniform speed to avoid distortion of the frequency to avoid «which is usually called Oleiohlaufsohwufen (yowling and flutter) are referred to «during the film progressively and intermittently on the exposure or projection image » Windows are moved past so that the sequence of still images is suitably exposed or projected can be. Various solutions to this problem have already been proposed.

One suggested solution is to use a sioh moving optical system? that one movement of the film with uniform speed past the film image window

409 88 3/0887

As far as is known, this solution has not found widespread use ₀ This solution is characterized by being difficult to construct in the construction of an optical system including moving mirrors or the like? the reproducible recording comprising of a suitable distance images during exposure and particular reproduction of images requested in an appropriate covering of the P tion allows "This solution provides further additional Liehe difficulties due to the need for" a proper focus sustain erhalten- to a Yerzermmg DA® avoid per jizierten image _o

A more common solution is _s a film loop of Tonstation and the film image window to provide / an. dsm jadaa picture is projected or exposed., While the film is accelerated or stopped at ami _{projection picture window 3} wLM the loop shortened or lengthened ^ so that the FOOT! can be moved past the fönst ation with the help of a capstan at the same = · moderate speed _o To maintain the? .FilmsahXeife has already been proposed _g LMnge to the extent of this loop and steusrn dl "speed either the Tonwella or the image step circuit on the film image window such that the film loop ein® constant average length aufweistο

Especially with projectors ^ where the projection lamp. has ein®n erhebllchtn Lalstungsbsdarf _s 1st as highly desirable ₉ Filmtrtnsporfegeschwindigkeits ^ Steugrsystema avoid _fl ir-gandeine © rhebliohe control dex "Betriebslei ° stungsspannuiig result _o In addition to the lamp is dine money" supply erforderIich ^ to the various constant speed or variable Speed-operated motors used in the projector to drive the various electronic circuits used: to supply energy and to drive the fan ₉ . that usually

C 3

Many used for cooling of the projection lamp and its surroundings wirdo otherwise appropriate engine speed Steuersystesne would either result in difficult to fulfill requirements for the operating power supply to the audio transducer or would achieve a sufficiently constant transport speed _o

Projectors should generally be operated on a standard alternating current network, which is often a network with nominally 120 volts and 60 Hz. Especially for narrow film formats such as ZoBo, the usual 8 mm or Super ° 8 => format has a light source of sufficient brightness and suitable small size customary =, the long operating life of over ₅ when needed for a © Be = & ° I @ bsspannung interpreted by far below 120 volts Isto line such commonly available projection lamp at = · sple ^ sweise a voltage in the range of about 20 " 5 volts alternating voltage for optimal operating _{properties 0}

It is, of course, easily possible * to provide a separate transformer to operate the projection _{lamp o} The large size ΰ the weight and costs of a transformer * that uses a 100 ° or 150 watt lamp at 20 volts on a 120 Volt ^ source operates however speaks against the use of such a transformer > ~

A solution for this social welfare system? includes the use of an elite combined motor and door formatter ₉ bsi your motor is a shaded pole XndukfciDnsiacijor, with äem bilfis = windings on the ferromagnetic stator of the motor gate to provide the operating power for the projection lamp and other electrical components of the system _o The rotor of this combined motor and transformer drives the fan of the system and also drives the film feed gripper of the projector via a reciprocating mechanism prior to the usual structure tn _o A DC motor drives the capstan if necessary

40988 3/08 8 7

Flywheel on _o

Since extreme uniformity in the speed of the film past the capstan is essential for good sound quality, it is extremely desirable to operate the capstan motor at a constant speed and to adjust the speed of the combined motor and transformer so that the free speed of the Film moved by the gripper is equal to the speed of the film past the sound transducer / - · Β?; = Known control systems for induction motors include jesloeiA öi * »regulation of both the rms value and aueft. the peak value of the motor windings zugeftthrten voltages _c dlee is> ₅ that considerable ibiöermg ^ n the zugefUhrten the projection lamp Effektivspanamg change "" el projectors of the type described two reasons \ m®tw $ n dkiv ~ The first reason is their Hciligkel so far ^ that the quality DTIS projizlerten image mldb bar influenced wirdo Secondly, it follows any change de top ^ - voltage very sehnell a change in Gleionspejinungg di "m" - = is passed ₅ to the constant speed betrU-VJE ^ ..- engines? control ^ if not expensive reggisolation steps are used «

The invention has the object of "improved schwindigkeitB controller for Induktionsmotorcn z \ i fen, the sound film projectors allows simplification of the structure and construction of T, and wherein the control lei 'shaft speed of a combined motor and transformer; ^ s © ϊ * _s is lightened without influencing -3θβ Splts ^ nwa ^ teE and without noticeably influencing the effect;! value of transformer voltage O

This task is given by the specified in claim 1 He finding solved.

Further advantageous refinements and developments of the invention emerge from subclaims ₀

409883/088 7

air * Prejelctw is one of the basic principles of the invention with constant speed su-bdite & de

to advance a strip of a

Cinema films with a magnetic sound track at constant speed past a converter and a projection station waist ο so that the film is gradually moved in front of the film in order to be monitored by a projection larapa with the help of a projection larapa. The Pc? © j @ ctionsstation will pass ¥ on ü & m HotOK ¹ ai

.Spialtpol induction rotors like Trfinsföinrsators Sine

muf the stator of the combined Li Mo = g @ speisto The sn-argie füs' the lamp wlrsl ^ des? W: L @ klung © n delivered on the stator

Öl® primary wielclting the combined motor and transformer is with the help of a new type of control circuit with energy Vi-r = s © rgt ^ which forwards a half period of the mains voltage without raerklioli © O inoculation and which forwards most of the other half period of the natural voltage whereby this forwarded part has no noticeable weakening or attenuation o A part of the controlled half-period of the mains voltage close to the zero transition of the mains voltage is not passed on to the primary winding o This part is carried out with the help of a control circuit under the control of a voltage-dependent clatter _{uatsrdrüekt a} -that has an effective <, of a 25 ^f ills gssteuei'tQ 2tltk © nst ^ it © ο -

BIe? Höto3dl-l <9- .But the length of a loop in the film between the wall and the film-picture window firmly _{a in} order to selectively interrupt a tall aine ^ half-period of the mains voltage Mot © ran = idle voltage produced _a that acts as a brake for the motor.

. ■ _ ■ "■ - ■■■. ■■■" ./. '

A09883 / 0887

like control of the motor, that its mutation B of the capstan speed is fixed on this catfish kasu; © 1; θ suitable regulation of the motor speed without influencing the value of the motor voltage and with only the lowest of the effective value of the transformer voltages achieved

The invention is illustrated below with reference to in der ZelotefMsig The execution examples provided are explained in more detail

Sseigen in the drawing}

Pig ο 1 a sehematisohea Bloafc = and
an embodiment of a

2 shows a graphical representation to explain the mode of operation of a part of the device na & h ^ igc U

Figo 3 is a visual image of an AvisfUhrungsforra a shaded pole = Induction motor »and transformer control @ lnriohtungj

Fig. 4 is a circuit diagram of a modified embodiment of the Qesohwindigkeltssteuereinrlchtung according to Fig. _3, which is useful in applications with an inverted logic *

Fig. 5 shows a circuit diagram of a further modified embodiment for the speed control according to Figo 3 in combination with another form of an Iniuktions = motorsο

In Fig. 1, a movie projection bugger is shown ^ that with Aus = would take the specially described parts of common construction can be. In detail, see the cinema film strip designated in general sr & t 1 extends between a supply reel 2 and

409883/0887

CO / CT)

a Aufwiekelspw.le 3 on a route through a © display stations indicated at 4 and one generally mil; 5 β & drew Projefctionsstationo

The film can be along at least one edge. be provided by arranged at equal intervals Perforationslöehtrn ainer series ,, which is moved in a customary catfish with a Bildschiittseli & lteinrichtung £ usammenwirken _B so that the film image for EIID to ä & r Prejektionsstation 5 _e on the film 3, B®: C £ nd "" n is phot @ graphisc: h recorded image _3, each of which is a photographic slide in a sequence of moving images, whereby these images can be viewed step by step as a fine sequence of projection ₀

At least along one edge of the film 1 there is a standard strip of magnetic material, such as Z ₀ B, magnetic iron oxide or the like, on which a sound track can be recorded, either during the exposure of the film or during the exposure and development “Alternatively, the soundtrack can be recorded photographically and reproduced with the aid of photoelectric devices _e

The sound track on the film wlikt with a usual playback = head 9 together ^ which in magnetic recording a magnet = head is to The head 9 is arranged so that it is with the sound track at the Vftedergabestation 4 comes into contact and he is with the Surface of the film 1 for this purpose with the help of s © nematic as a resilient pressure pad 10 shown devices brought into contact

The film 1 extends from the supply spool 2 through the straight described playback station 4 and then between a Laerleufrolle 11 and a sound wave 12 “The sound wave 12 becomes constant with

409863/0887

Speed with the help of the ¥ © 11 © lA elr.-.ee f & llch <s> \ ü ^ 15 driven The motor 15 wirä B & t helps? sisey k voltage operated with a potential B + with respect to ground at speed «if a switch l6 is solassar? In addition to or instead of the constant supply for the motor 1J> any standard control circuit can be used ^ if this is required, -. a flywheel can be connected to the shaft 1.4 * -, ukb the speed of the capstan 12 further to regulelin-, the wts ^^ t 1 icii ^? i? Jrt in Hinbliak on the present invention test the α & .τί &, _ε . A&B speed of the capstan is constant enough * to keep fluctuations within acceptable bodies σμ.

From the 5tonwell # 12 of the film is one aln next Üt -. 'T * a fixed guide TJ> a conventional manner, not shown, is attached to the frame of the projector Lg Any Color §Ä3f and tiarm the projection station 5 "As shown this _a can the © ine loop 18 tables the capstan and form ο

To the projection station 5 is a usual Proj © kfci © nsV9rri <shtung provided _e comprises a lamp with a reflector 20th, the IMT arranged so _& that a light beam through a suitable nioht gezeielinetes Bildrahmenfenstfir in a Übllsh "r4 plate 21 directed wirdo The pressure plate 21 oil @ nt to supply the Bremtebene on the film 1, major? h the film hiiiöurch fl!>? ir tragenee light passes through a Ubliohes schematis © h with 22 be? "iel scribed Linseneystem and passes on any g @ eign @ th Bsi · ^ e line screen ^ which is shown schematically at 2 ° ß «

The film is disposed s # ^ that it is s @ hrittweise moved forward to ύ @ ν Fr @ _t 1EK = tion station with the aid of a conventional Fllmantriebsmecharilsmu ^ _s is schematistsh shown with a Antriobsgraifr ^ 24 ₉ which is connected to a crank £ f> ο wScü this is indicated at 26 »The crank £ 5 is supported by a well ^ £:

409883/0887 _; /

BAD OBiGiNAL

242815A

admits s 41ß wa iia rotor 28 of a combinedari- ■ und SpaXtpol ^ Xndufctioihsmotors-- angat-r-ie ^ tüi SfIrQ ₅ . i # J ³ füLlgsJt ^ iJS mi ν 29 bezeio & net is ο As this is sohematlseh presented «, drives as. Shaft 27 also a fan 70 on *; around the Laiaps 19 "and their training mn cool" The combined TrariaforEiatoj? and shaded pole. Inöuktionsraotor 29 can be of conventional construction

"Ifaim-die Welle" 27 the crank 25 is turned "J @ r arelfev Zk and moved here in. Tibliaher catfish in Ssliwin ^ mg®" vers © tzfe _B around ta; with successive perforation steps eh®vn in <era pühe a in -intervention lu koMaeö unä um the * Filun in Sah ^ itt ^ n \? σιι © in® :?

Mfetsmibewegeno Naah ^ eder dararfclgen Bewsguiig 4 -aMi © » ¹ intervention with öem film υχιύ returns la ü'im • feien for the aäahg-fairies. y'pr3ehubhub engages the darraxf

6 back this one. Process is Itir FllTnpr @ Jiektorgebi © t good bekasint and mx nleht näimr © rllutert- be ₀

DI © Aufwiokfgiapile 3 for the film 1 is driven by a motor ^ O via a Rutsehkupplung Ji. The motor JQ can be a usual Ulei @ hstr @ mm3tor _{5 to} which the operating current τοη is fed to the supply connection at B + »The motor 30 is with operating = current fed ^ when a usual switch 40 is closed _{£ to} close a circuit on the supply connection at Bs- and over ^ 'di © Moi'örwleklung- g-agen mass ₀ The fixed speed of the motor JO is selected in this way that it is above the maximum Gösohwiniigkait d © s Filaas 1 ₉ which is caused by the intermittent backward movement "of the gripper 24."

The FiIm ;! extends. si @ h from the Frojekfcionsstatlon 5 over a dis _s pfungsf ^s 0l! e 32 to the Aufwiekelspule Jo The damping roller 32 -filrü stopped in the usual manner during the projection of the film, so that the starter reel 3 can not move the film 1 forward, clutch. 31 iaits © ht _a - but with the exception of the time "= ΊΧϊ which the gripper 24 then moves forward to FiIn 1

409883/0887 ^{o / c}

remove it from the dampening roller for 188 _s so that a short piece of spool J5 can be wound up »this is also common»

The transducer head 9 has a UbIiehe winding with connections on β which extend between ground or earth and the pawl of a conventional switch 4l, which connects the head 9 to the output circuit of an amplifier 42 for resolving sound signals on the film 1 or to the input circuit β in © 3 amplifier 4? connect t ₉ to the Wiedargaba from to dsm J? iln · χ ad? to enable drawn sound signals “To this 2” aok. i ^ t an ubiquitous microns generally designated 44. is connected to input circuit of amplifier 42 v # rbundeji _g viähranä ain generally with 45 labeled loudspeaker with Sem of amplifier 43 ο

It will be generally understood that the device described so far served to record or reproduce soundtracks iur 'filmstrips 1 as a function of the position of the sohaJt & rs 41 during the projection of the film on the screen 2> with a suitable correspondence between the image and dsm tone bestehti as long as the length of the Sehlaife: constant i8 the Qes @ hwindißkeit represents Hin = movement by controlling the Filaaii ^ IIAB's = gripper 24 «In the following vi ± M" aira S j means Oer for controlling Drehsahl of the combined and transformer 29 to achieve this result

The motor and transformer 29 includes a conventional stator & 6 with pole pairs, such as ζ _β Β _β 4? and 48 ^ with one pole jedsa Pa & res, such as _a 48 by a conventional kurageschloseenen Spaltpolwick = lung 49 provided Iste A primary winding 50 on the stator 4o supplies the excitation current for the motor and is, as shown beil 51 Isti tapped "to a suitable voltage source for operation of the lamp 19 to create _o The Friaiärwick 50 deliver

409883/0887

BATH ORIGINAL

also the excitation current for a secondary winding 52 'whose center tap connected to ground iat _s as shown at 53 and relative to ground balanced lines 54 and 55 with the Eingangeanschlüssen a conventional DC = voltage ° power supply are connected 56 "woist ₉ · in When switched on, the power supply 56 provides a fixed equal = voltage potential B + with respect to ground, which is used to operate other devices and equipment in the system »

An excitation circuit for the winding 50 extends from two usual input terminals 57 and 58, which can be connected to a standard alternating current source *, such as "B" with a 120 volt = 60 Hz ° WeehaelstronnetZo The terminal 58 is connected to a reference ground while Terminal 57 is connected to earth via a switch 59 with a first branch from the anode to the cathode of a conventional diode 60 and then via the primary winding 50 of the combined motor and transformer 29. A second branch from the switch 59 to the upper connection of the winding 50 extends from switch 59 to the cathode of a conventional silicon controlled rectifier or SCR 61 "The anode of silicon controlled rectifier 61 is connected to the top terminal of winding 50" as shown ₀

The gate electrode of the controlled Silizlumgleiohrlchters 61 1st with a Lastanschlüß a conventional silicon unilateral switch or SUS = 62 is connected _a gate electrode of the non SUS 62 is used in the circuit

The SUS is a common component *> wherein a Durchbruoh he «follows, when a voltage in the range 6-10 Voit ₉ of its LastföiSchlüsse is applied depending on the specific selected component along ^. If this threshold is übersshritten · voltage _e decreases the impedance along the Lastansohlüsse ate * so that this component acts as spannuhgsab = switch-dependent "

409883/0887

2 £ 28154

The load connection 63 of the SCTS 62 is via a conventional photocell 64 connected to Brde «A resistor 65 is between the An = Sohluß 63 and the cathode of the controlled Silicgleiohrlehtsrs

61 switched on «

It can be shown that when the input terminal 57 goes negative with respect to earth, the voltage at the terminal 63 increases with respect to the voltage at the cathode of the SCR 61 with a rate determined by the ratio of the resistance of the photo cell 64 multiplied to the total resistance of the series circuit of the photo-Selle 64 and the resistor 65 determined by the Anstiegsgesßhwtndigkeit the input voltage "is therefore the potential at terminal 63 reaches the threshold voltage of the _fi SUS

62 brings it into the conductive state /, after a time ₅ which depends on the current impedance of the photocell 64, which in turn is determined by the amount of light falling on the photocell

The photocell 64 can be illuminated temporarily with the aid of a conventional lamp 66. The lamp 66 is + fed by a stream from the Olelohspannungsversorgungsquelle at B "wherein the operating voltage supply is connected via the filament of the lamp 66 to earth, so that the lamp is illuminated _s when the switch 59 is closed to switch on the operating voltage supply 56" The optical path between the lamp 66 and the photocell 64 can be interrupted by the loop 18 formed in the film 1 * if this loop has a predetermined length o

The photosensitive element of the photocell 64 is preferably somewhat elongated so that as the length of the Loop l8 is progressively covered and is not abruptly darkened. Typically the resistance of the photoconductor is o 64 low when this is strongly illuminated and higher when that

409883/088 7

Lighting drops ο When the photocell 64 is complete is illuminated by lamp 66 "it has a low resistance" so that the threshold voltage required to trigger SUS 62 is relatively late in the half cycle is reached «while terminal 57 becomes negative»

When the SUS 62 is triggered "the controlled silicon rectifier 61 is switched to the conductive state" so that the remaining part of the negative half-period of the mains voltage at the connection 57 flows through the winding of the combined motor and transformer 29 "In Fig. 2 is a typical period the voltage at the upper terminal of the winding 50 with respect to earth is shown _o

As shown, * the positive half cycle flows through the Winding without any interruption »If the voltage at An = Conclusion 57 However, if it becomes negative, there is no conductivity until the voltage "VT at terminal 63 has been reached" with this Time the controlled silicon rectifier 6l is controlled into the conductive state »Then the remaining part flows the negative half-period through the winding 5O · The result Is a resulting DC voltage unbalance in the motor voltage which has a braking effect on the motor

It has been found that sufficient control of the speed of the rotor 28 of the motor and transformer 29 can be achieved by controlling a half cycle of the mains voltage in a range from 0 to 10 ° from the zero crossing. It can be seen from FIG. 2 "that this control does not influence the peak value of the voltage across the winding 50". Therefore, viewed from the operating voltage supply 56, the same peak value results "regardless of" whether the voltage is regulated or not ο It can be shown "that the effective voltage" which determines the brightness of the lamp 19 "is very little influenced by the control

■ 4 0 9.88 3 / 0.88

the firing angle of the range is influenced by 0 to 10 ° to a half period About "If _s is particularly angenommaft that the mains voltage V has the form V ■ © Asin, then the effective value of the full waveform results to;

Sln ² wastes «0.707A

IfJBin part of a half cycle of the oscillation proceeding from the Zero duration up to 10 ° beyond the zero crossing afogssehnit = ten, then the loss of the rms voltage results from the following equation J.

»2.4 Jg V _{eff β}

Thus, a complete control over the interval of 10 ° only results in a change of _2.8 k% in the effective voltage,

The mode of operation of the system according to FIG. 1 should generally be understood from the description above. It is, however, briefly assumed that the film 1 is initially arranged on the supply reel 2 and that the film is actually taut between the supply reel and the take-up reel 3 is stretched over a path through the playback station k _B through the capstan 12 and the Leerlaufroll® H ₉ over the guide IJ ₅ through the projection station 5 and then over the damping roller 32 to the take-up reel 3 »In this state the There is no loop 18 and the film 1 completely exposes the optical path between the lamp 66 and the photocell 64

It is next assumed ^ that switches 59§ ^ O and 16 closed ^ so that motors 350, 15 and 29 work

409S83 / 088 7

- ■ beginning "Me. Lamp 66 is illuminated and the resistance of the Phdt © cell @. 64 is very low at the beginning because it is completely illuminated by the lamp due to the lack of a loop 18 in the film 1" Correspondingly, the rotor 28 begins of the combined motor and transformer 29 to rotate slowly because most of the voltage applied to the mains connection 57 at the negative half-cycle of the mains voltage occurs across the resistor 65 so that the time in each half cycle before the SUS 62 and the conductive © state of the controlled silicon rectifier 6l later is _o

The initial average speed of the drive of the moving film = greifer'24 is therefore lower than the Gesohwin "= velocity of v @ n the capstan 12 under the influence of the motor 15 advancing FilmstUokesO 'Accordingly, builds up a loop l8 on _fl to a Shading of the light from the lamp 66 on the photocell 64 begins. When this occurs, a higher percentage of the voltage of the negative half-period along the photocell 64 appears. so that the SUS 62 during the negative half-= "periöde earlier durohbrichtß so that the rotor of the motor 29 can be" _fl accelerate until the loop 18 -Clinched a stable mean position * ^ to it varies around the average speed of the film to, the pro ^ ectlonsstation 5 by the same as the speed of the film. the playback station 4 to hold over.

It is: is "su Erk9raitan.fi that if the projection consistency is l8 single images per second ^, the trigger = -epannuns.-VT iFig ·. 2} _s at which the SlJS 62 leads * sju t intervals during the negative half-period

so that the Zttndwinkel periodically repeated at approximately fs three periods of the mains voltage changed These lfe => alteration -wlru uv & ch the inertia of the motor integrierti. so d & ß si «in ö @ ?." ^ the speed of projection is not discernible - c

& 8 3/0887

^ shows a modified example of execution - © es ¹ -äm-Gh® * '?> ■ ?. Keltssteuereinriehtunge in which a probe 71 anateil *>'* β * used 65 in the circuit of Fig. "As can be seen" this circuit is a -Ssba ia which inverts the control logic iet _s so d & ö a relaxed-'m * 1 * i nufi change be made in the arrangement of the parts in. the system of Figure I * tan the same operation to recoverable # n _s as Nooh understandable vrirdo

In Figo 3s in which the parts of Figo 1 corresponding ϊ ^ ΐ1 # ai are denoted by the same reference numerals; © rsferestet slali the control circuit for the winding '50 of the combined motor? M &T?> - wm => fonsators 29 for the positive half-period of the % € tzag * a.ias.wg the diode 60 and for the negative Efelbpsriode by di ^ circuits the controlled Slliziumgleichrichters 61 as in "Torsteuerkreis for the controlled Sillsiiungleicte-Icfcfcar 61 is instead ά # ε opponent object 65 modified by the use of Kondensaters 72 according to Figo 1

The result is that the capacitor 12 is charged during the negative half-cycle of the mains voltage at a <at the connection 57, the stronger the photocell 6 ^ bel @ aehf; and it is the individual time constant given by the product of the capacitor 12. and des
fixed »

If the photo is completely illuminated S-St ₄ , the % 'u = & along the photocell rises rapidly to the value m \ ,. hmi d ^ Li 1ί5 £ S?;> tet _£ . ? whereby the controlled Silizitungleiciiriehter S € ä oil l _iA is *: leitfShigaa state is controlled and the left © part OETR HSI j period "is weitefgeleitet _s as lsi shown in Figure 2; * ifc reference to Figo 1 can be seen ^ d ß wsimöig Fhofcossllii initially completely in the absence of SchHeiie * 18 illuminated i * i * -. the engine 27 to work sehnaller start "f" ould _e the j-she ^ back to Figure 1 would under these circumstances without amendment does not

-J- 409803/0887

BATH ORIGINAL

Modification *, which enables operation of the system according to FIG. 1 with a position in the figure 3, would consist in exchanging the terminal and the projection station with one another, so that the film gradually moves from the projection screen 24 in the direction of would be moved di © sound ta tion '' So would it? iiot®r usd .Transformator 29 sehnaller · ¹ ^ work until the loop l8 with o% w rishfeigign length formed isto

line further modification of the system according to FIG. ₉ which would enable a suitable battery circuit according to FIG. 3, * is shown in FIG is as Ätesshi ^ mng facilities abgesohlrmi ^ shown 73 a direkt® illuminate the photocell to prevent 64 »in this Weia® the photocell 64 @ ht ~ v © n the lamp achieved in the absence of loop 18 no Lt 66a ₀ when the loop 18 formed ₅ it => / @ n the film 1 reflected light reaches the photocell 64 _fl so that at the * SUS 62 in the negative half-period breaks through early and the M @ fcor accelerates ^ so that the same operation as wherein the control circuit according to Figo 1 _s results in d®rd @ '^ motor ^ T ^ ansformator is operated slowly until the SSHL © if <§ mifgdbaiut is _fl, after which the speed is increased the engine Trans = ₅ to a constant loop size =

Figo 4 shows atoe another modification of the speed control 71 of the circuit according to Figo ^ o With this scarf tong! At di @ Diad © 60 connected to the SOl 61 as before and the SSS 62 is connected a resistor 75 between the Torelek- = tr © d @ di§8 SCT. 61 and earth switched on. A photocell 74 is switched on at the Xa fei iod θ of the SCR 6l and the connection point awisehen the SUS 62 and the resistor 75 _o Due to this 3rs @ it is higher when the photocell is illuminated

A 0988 3/0 8 8 7 · / ·

Share of the voltage en terminal 57 along the ■%:>&% £ sta; sss 15D s © that the 3US 62 runs during the negatt-ran Halbgar-ioäs f and that the speed of the motor is running? FIg ₀ 3 gröBerto In this way, a greater Liohtaisnga "increase the speed of the motor and a smaller list quantity causes a decrease in the speed of the motor .; gsr-euso * ria this would be the case with the circuit according to Pig _o 3

Figo 5 shows a modified embodiment ₃ the dii the basic idea of the circuits described above ve? ¥ aalet embodiment represents a problem for another embodiment of an induction isotors dac _P liah for a split phase induction motor ₀ As shown isfc ₅ includes the motor a rotor 80, an arste winding 81 and a second winding 82 _s which is connected in Raiha with a phase capacitor 83. As shown, the winding 81 is connected between an input terminal 84 and £ tüq and the capacitor 83 and the winding 82 are connected in series between the terminal 84 and ground _or

The motor 83 can be operated from a conventional alternating current source which is connected between an input connection 85 and a grounded connection 86. The connection 85 is connected to the terminal 84 via an on-off switch 87 and "then connected via a first diode 88 enclosing branch with the Ansohluä 84 A second branch extends from AEMM switch 3? in its closed position from the cathode to the anoda of a controlled silicon tube 89 and then to connection 84 "The gate electrode connection of the controlled silicon device" ars 89 is connected to earth via the load connections of a conventional disc 90 and a variable resistor 91 veränderliehe resistor 91, a photoconductor be wi # in dan waiter © ben described embodiments odar ®v can be a manually adjustable automatically or resistance vm. another con = constructive tion be *

409 * 8370887 * ^{/ c}

The TsÄinäiSösspinfe üem variable resistance & id @ s 91 ^ Maa 9Ö is returned to the cathode of the controlled silicon l © iGl »* i ^ 89 via a fixed resistor 92 o The © of the circuit according to Figo 5 fulfills the same purpose as SUS to the one described above AusfOhrungsbeispieleii can even be used in place of this SUS In these Ausführungsbeispielsgi _s if desired "

In operation with the switch 8T closed, the diac 90 conducts, according to a voltage typically between 28 and 36 volts _5, which at Pimltt in the negative half-pearl © dej? ümt reached 85 incoming line voltage _s the durdi

The resistance 91 to the total resistance of 91 and 92 determines lato Verni the diac 90 leifcefeä, controlled Slliziiangleiahrishter 89 in the conductive Shigea controlled "so that the remaining part of the negative half-period passed on _{MlTa s} as shown in Fig. 2" The result is a Slelehespannungs ^ Unsyinmetriesignali the windings of the motor wlrd ^ so that the motor ran at a lower three-digit. An increase in the resistance value of the resistor 91 causes * that the diac 90 conducts earlier in aew and therefore a lower voltage

en ümi engine puts on » Aurdh. alteration used to control the meter on Wiä © i ^j etandswertes of the resistor 91 _o

409883/0887

Claims (1)

Patenfeanspriic h Tonfilm-Transportgesehwlndigkeits-Stsuereiariciittmg in connection with an induction motor with a WeGhse. winding to be fed ^, gekeanzeichne t one connected in series with the winding (5O ₅ 8l * 8a) vs rectifier (6Q ₈ BB) ₀ dsr half-periods of an alternating current with a first pole & rritäfe ao öt <§ Bl ₉ 82) forwards ,, a parallel s>? 4-3 «£ Ββί οα ^ Λ'-ο 88) connected electronic Sahaltsr? 6J. _S β \ 5 / do adjustable spannungsabhMnglge Einrieiltungen (δί \. 6U ^ T ^ t 9-91} _s associated with the Sehalter (6I ₅ 89) _s SINOE to close the switch and to a portion of half cycles of an applied alternating current to the winding C50 _s 8l _s , fe; to forward when the voltage of the applied alternating current reaches a predetermined value with a polarity opposite to the first polarity _o ο Control device according to claim I ₉ marked by two input connections (57, 58; 85 _S 86) which can be connected to an AC voltage source ^ ₀ devices for connecting the rectifier (6Q _S 88) and the winding (50 * 8l _fl 82) of the induction motor (25) in series between 3 # sr .. connections (57 * 58 | B ^ ₉ 86) in such a way that a current flow wSA of a first polarity through the winding is made possible as a function of the alternating voltage applied to the input connections first impedance (64), a swsite impedance (65) s the first and second impedances in Bel-he swif 3ϊ? © λ the input connections connecting directionsx. where Ae.v electronic switches (61, 89) loadChIUSSe ₄ , which are connected in parallel to the rectifier (6O _S 88) »as well as θϊ, γ-λ control terminal, which has an applied signal / ariK,; r \ afc um a low impedance path along the LestansOiiZtis -se 409883/0887 BATH ORIGINAL like this: SQha. ££ mis «robe! the spaimungsabbängigen 64> -65) · turned ₉ zuzttftlhren to the SteueransefcluS © in control signal when the voltage across one of the · = pedapzen reaches a predetermined value vnä wsna the Polar · = | the * Sfeeueransohlufl and * Verbin "ätmgspo8kt the import! tEt 43 voltage across the input terminals is opposite to the first polarity « Steiiereinriebtung nacii claim 2. _s thereby geke η η s ei δ ίι ti stj that one of the impedances a verMsöerlieher 4 * Sfeauereinrieiatüng after Anspmch 5 * dadureh keaß-. ζ β ί ο hm ψ t β Measure of the variable resistance a photo 'conductor- is »'" ■ -...-...- α controller according to claim ₉ characterized ^ g θ ie e η η ° s ei ch η et _seq that the other of the impedances a condensate Control device according to claim 2 _# dadureh gekenn = ζ β i η et _s that the electronic switch is on. controlled silicon rectifier (6l) and that the voltage dropping device is a unilateral silicon switch Stausrsii ^ ichtungii according to claim 2, since g ek β η η draws * that the electronic switch is a controlled tex * Sillziumglei chrichter (89) and that the spa2intmgsab => Switching device a diac (90Ϊ a Control device according to one of the preceding claims, characterized geke η η ζ ei G fr ne t ₉ that the motor is a split-phase induction motor (8 & to 8>) * 9 «Yorriö & daily according to one of claims 1 to? _it ΐ! α # ώ3? οίι ge k δ Q s ζ si e && ets daE the engine a S raotoi? _α controller according to claim 9 # characterized gekina-ζ tie 1 α β t ι that step motor comprises a stator |% 6) äiifwatst _s' if the winding (50) is arranged and that, furthermore, a Be ^ dllrwieijättng (52) on de © Stator (% €} is intended for supplying operating power to an external circuit (56} if “the first winding {50} with alternating current er = II «Control device according to one of the preceding claims _5, characterized in that the motor {29) has an output shaft (27) and that on the speed of the wool (27) compared to the speed of a reference walla (12) responsive devices for controlling the impedance value the variable impedance (64, 74, 91} are provided in such a way that a fixed relationship between the speeds of the (27, 12} is maintained. Stouereinrichtung for use with a film transport system which moves past according to claim 11 a film strip at a uniform speed on a Tonstation and gradually on a projection station, characterized in 'that the reference shaft (12) bring the film into engagement' bar and the latter by the! The station moves at a constant speed, that the transport devices (24) are connected to the output shaft (27) of the duct motor for step-by-step film transport at the projection station and are connected to the film; can be brought into engagement "in order to move this step by step through the projection station at an average speed which is determined by the speed of the output = because (27)" that is arranged between the stations and _s are provided on oils length of the film between the stations means responsive & l according to a control Siggie - to produce this length ^ and that ^ are provided to this signal responsive circuitry to the winding (5o) an alternating current with a Qleiehstromiinsymmetriei? which is determined by this signal «to supply» g @ k s η ζ ei ch η © t _s that the reference shaft _o control device according Ansprueh 12 ^ characterized a Filman1; wave actuating drive <= Ton =. (12.) ^ -aufweiet _f which is arranged at the sound station _£ and that devices for guiding a strip (l) of the film over a path from the capstan to a transport = gripper "(24) -. The Biläschrlttschalt * this path includes an area in which the film can form a loop (18) of variable length 64, 74, 91) are provided l4. Control device according to one of the preceding claims »characterized geke η η ζ e 1 without t _a that the induction motor is a combined induction motor and transformer with an output shaft (27), a secondary winding (52) and. a primary winding (50) for driving the shaft and for exciting the secondary winding (.52) and that a projection lamp is connected to at least part of one of the windings (50) * 15 «Control device according to claim 13 _S thereby g β k θ η η => ze 1 ■ © Yi η et ■>. that the devices responsive to the length of the loop (18) comprise a photosensitive impedance (64, 7k _s 91) and a fixed impedance (65, 72 ^ 75 _S 92), that the impedances are connected in series to the input connections and that facilities. (66) for illuminating the photographic 409883/0887 _o /. effipfisidll @ h @ zt Impedance * Swt elmm Weg: dureh <äl © Loop (l8) dss Filraes u ^ the length of the Sshleife a given longitudinal iSr- 409883/0887 BAD ORSGSNAL. is- Blank page