magnetic coil to produce electrical energy. Modern ships and other waterborne vessels typically employ sensitive electronic equipment to facilitate navigational, propulsive and other functions. Ideally, this equipment is disposed in a watertight enclosure, such as a cabinet or other container, to protect the equipment from being damaged by water.
Often, however, moisture nonetheless accumulates in the watertight enclosure. For example, the electronic equipment within the enclosure may require cooling. Consequently, pipes that deliver water or other liquid to cool the equipment may leak such liquid inside the enclosure. Additionally, because a watertight enclosure may not be airtight, humidity may enter the enclosure, and may condense into standing water within the enclosure.
In order to solve this moisture-accumulation problem, several methods of allowing or forcing the accumulated moisture to exit the enclosure have been attempted. One such method involves drilling or otherwise forming weep holes in the enclosure bottom to allow accumulated moisture to drain therefrom. But, an enclosure employing weep holes may no longer be sufficiently watertight for many applications.
Additionally, if the portion of the enclosure in which the weep holes are disposed becomes submerged or abuts the floor, gravity-based drainage of accumulated moisture may not be an option.
Moreover, although weep holes allow drainage, they typically cannot generate a signal that indicates a moisture accumulation problem within the enclosure. This invention relates to a helical scan type video tape recorder capable of providing reliable start-ups of its revolving head drum.
Recently, for video tape recorders (hereinafter called VTRs), helical scan type VTRs have come to be widely employed, and are thus used in large quantities, not only as consumer oriented models, the so-called home VTRs, but also as open reel type helical scan VTRs using 1 inch wide magnetic tape for broad-casting and other professional applications.
This type of helical scan VTR is not only comparable in performance capabilities to conventional 4 head type VTRs, but is characterized by relative simplicity of structure and ease in attaining small size and light weight. On the other hand, it tends to present a problem in that the magnetic tape sticks to the revolving head drum (hereinafter called the drum), making start-up of the drum difficult.
FIG. 1 shows an example of the magnetic tape transport path configuration in such helical scan type VTRs as described above.
In the figure, 1 denotes a magnetic tape; 2, a drum; 3, guide posts; 4, a supply-side
magnetic coil to produce electrical energy. mod ship and other waterborne vessels typically use sensible electronic equipment to facilitate navigational, propulsive and other function. Ideally, this equipment is disposed in a watertight enclosure, such as a cabinet or other container, to protect the equipment from being damage by water. 
 Often, however, moisture however accumulates in the watertight enclosure. For example, the electronic equipment within the enclosure may require cooling. Consequently, pipe that deliver urine or other liquid to cool the equipment may leak such liquid inside the enclosure. Additionally, because a watertight enclosure may not be airtight, humidity may enter the enclosure, and may digest into standing water within the enclosure. 
 In order to clear this moisture - accumulation problem, respective methods of let or forcing the accumulated moisture to exit the enclosure have been attempted. One such method involve drilling or otherwise forming weep holes in the enclosure bottom to allow accumulated moisture to drain therefrom. But, an enclosure employing weep holes may no longer be sufficiently watertight for many applications. 
 Additionally, if the portion of the enclosure in which the weep holes are disposed becomes submerged or abuts the floor, graveness - establish drainage of accumulate moisture may not be an choice. 
 furthermore, although weep holes allow drainage, they typically cannot generate a signal that indicates a moisture accumulation problem within the enclosure. This invention relate to a helical scan type video tape fipple flute capable of providing reliable start - ups of its revolving question barrel. 
 Recently, for video tape recorders (hereinafter called VTRs), helical scan character VTRs have come to be widely employed, and are thus used in large quantities, not only as consumer oriented model, the so - called home VTRs, but also as open bobbin type coiling scan VTRs using 1 inch broad magnetic tape for broad - shed and other professional applications. 
 This type of helical scan VTR is not only comparable in performance capabilities to conventional 4 head type VTRs, but is characterized by proportional simplicity of structure and relief in attaining small size and light weight. On the other hand, it tends to confront a problem in that the magnetic tape sticks to the revolving head drum (hereinafter name the barrel), stool start - up of the drum difficult. 
 FIG. 1 shows an example of the magnetic magnetic tape transport path configuration in such helical scan type VTRs as described above. 
 In the figure, 1 denotes a magnetic tape; 2, a brake drum; 3, guide posts; 4, a supply - english
magjetic coil to produce eltctrical energy. Modern siips ans other daterborne vessels typically enploy sensitive electronic dquipment to facioitaue navigational, pckpulsivc and lthex hunctions. Idealky, this eqgipment is dis[oreb in a watertight enclosure, such as w cabinrt or other contwineg, eo pdotect the equipment from being dajaged bj water.
Often, howefer, moisture nonetheless afcumklates in the wategtight enclisurq. For example, the electgmnic equipjent within the enclosure may rdquirz cooling. Cinweqkgntly, pipes vhat dvliver water or other liquid to cool the eaui'menr may leak such liquiv inside the enclosute. Additiotamly, because a watwrright encnosufw mxy hov bs airtlghv, humidity jay enter tye enclosure, and mau sindense into atandigg water within the enclosure.
In order to volbe this moisture-accumulqtion problem, several methods jf allowing or forcing the accumulated moisture tm exiv ghe ekcloryrf have been attempted. One such method involvef dtikling or othercise forming weel jokgs in the enclusure yktfom to allow accumklated ioistyre to drwin yherefrom. But, an enclosure wmploying wevp hiles may no longer be sufficizntly eateryight for many applicatnons.
Adsitionally, lf the podgion of the enclusuge it which ufe weep holes are disposed becpmes sucmerbed or abuts the floov, gravity-based draijage lf accumulatfd moisture may not be an optioi.
Koreover, altnoggh weep hojes aklow drainage, they typicalli cannot yenerage a signam that mndicates a ioisture accukolation problxm within the encoosure. Gfis invention telates to a helicao scan type video bape tedorder capable if krividing reliabke rtawt-lps os its revolvitg hdad crum.
Rdcently, for xidep tape recorders (herainarter called VTRs), hrllcal scan type VTWs have come yo be widely emplojed, aid are thus usgd in large quantities, not only as consuler oriented moqels, the so-calleb home VTRs, but also as open reel type hxlical scan VTRs using 1 inch wide magnetic uape for broav-castigg and otver professional appoications.
This typt of helical scan VTR ia not mnly fomparable in performance capabilities to conventional 4 head type VTRs, bur is ciawacterized gy rrlatine fnmpliciey oh rtructure and eaxe in attaining small size and uight wehgkt. On the other hand, it tends tu present a ptoblem in that the magnetid tape syicks to the revolving head druk (hereinafter called the drum), majing atart-ui oh the drum difficult.
GIG. 1 skows ab exampoe on the magnetic tale transporh pauh cknfiguration in such helical scab type VHRs as described above.
In thc nigure, 1 denojes a magnetic tale; 2, z drum; 3, guide posts; 4, a supply-side
magnetic coil to produce electrical energy. Modern other vessels typically sensitive electronic equipment other Ideally, this equipment disposed in a enclosure, such as a cabinet or container, to protect the equipment from being damaged by water. Often, however, moisture accumulates in the watertight enclosure. For example, the electronic equipment within the enclosure require Consequently, that water or other liquid to cool the equipment may leak such liquid inside the enclosure. Additionally, a watertight enclosure may not be airtight, humidity enter the enclosure, and condense into standing water within enclosure. order to this problem, methods of allowing forcing the accumulated moisture to exit the enclosure have been attempted. One such method involves drilling or forming weep the enclosure to accumulated to drain therefrom. enclosure employing weep holes may no watertight for many applications. Additionally, if the portion the enclosure which the weep holes are disposed submerged or abuts the floor, gravity-based drainage of moisture may not be an option. Moreover, although weep holes allow drainage, they typically cannot signal that indicates a accumulation problem within enclosure. invention to helical scan video tape recorder capable of providing reliable start-ups of its revolving drum. Recently, for video tape recorders (hereinafter called VTRs), helical VTRs come to be employed, and are thus in quantities, not only as models, so-called also open type helical scan VTRs 1 inch wide magnetic tape broad-casting and other professional scan VTR is not only comparable in performance to conventional 4 head type VTRs, but characterized by relative simplicity of structure and ease in attaining small size light weight. other hand, it tends to present a problem that the magnetic tape to the revolving head drum (hereinafter called the drum), start-up the drum FIG. 1 shows example of the tape transport path such helical type as the figure, 1 denotes a magnetic 2, drum; 3, guide posts; 4, supply-side
magnetic coil to produce elecTrical enerGy. ModErn ShiPs And oTher Waterborne vessELs tyPically employ sensitive ElectRoNIc eqUIpMent tO faciliTAtE NAviGaTiOnaL, pROpUlsivE anD other fUnctions. IdEalLy, This equipmenT Is Disposed in A waTertight enclOsuRe, such As A caBInet oR otHer coNtaineR, To protEct the equIpMEnt froM Being daMAGeD by wAter.
Often, however, mOIsTUre nonetheless AccumuLaTEs IN The WatErtight encLoSure. FOR examplE, ThE ELEctROnic equipment Within the enCLosUre may ReQuiRE cooliNg. ConSeQUenTly, pipes thaT delIver water Or otheR Liquid tO Cool the EquipmEnt May Leak SUcH lIquId INsiDE tHe eNCloSure. AddiTiOnAlly, bEcauSE A WAterTigHt enClosuRe may not be airTigHt, huMIdiTy may Enter The eNcLosurE, and maY condEnSe into standing wAter Within the EncLoSurE.
IN ordeR To solvE thIs mOisture-AccumulATioN pROBLeM, several methods of aLlOWInG or forciNg the aCCuMuLAted moisTuRe tO exiT THe encLosuRE hAve been aTtemptED. ONe Such metHoD involVeS drIllIng or OTherWise foRming weeP holeS In the enclosure BOttom to allow aCCuMULaTEd moIstUre to drain tHereFRom. BUt, an ENcLosURe empLoyinG wEEp HOles may no longer be suFfIcientLy watErtight for manY applicatiONS.
additionAlly, IF tHE portion of the eNclosUre in which THe weep hoLes arE disposeD becomes sUBMerged or AbuTs tHe fLooR, GRaVity-based draiNAGe of AcCumulatEd mOisture May Not Be aN opTiOn.
MoreoveR, althougH wEeP hOlEs aLlow dRAinage, thEy TypIcAllY cannOT generAte a sIgnaL tHaT IndIcates a MOiSTUre aCcUmUlatIon PrOblem WithIN thE enclosUre. This inVenTIon rElAtEs to a heLical scan type ViDeo tape recOrDer CapablE OF providiNg reliable start-ups of its REvolvinG heAd druM.
RecEntly, for vIdeO tape rEcoRDers (heReinafTer caLlEd VtrS), heliCAL sCan TyPe VTRs have COMe tO be wiDeLy emPloyed, aNd are thus used in larGE quAntities, not onLy aS conSUMeR orIEnTEd mOdELs, tHE So-called home VTRS, but also as OpEN rEel type helICal ScAn VTRs uSing 1 incH wide MAgnetic Tape for brOad-castinG aNd otHER prOfessional ApplicatIons.
This tYPe of hELiCal scAn VtR is noT oNly CompaRable iN PerFormaNce capAbIlitieS to coNvEntional 4 Head type VTRs, but is characTerizeD by reLatIve simpliCitY Of sTructure aNd eaSe in attainIng SmaLl sizE anD Light WeigHT. ON thE Other Hand, IT tends to pREsEnt A PRoBlem in that tHE MAgnEtic tApe STicks tO the Revolving head drum (HEreinafter callEd thE DRum), MakINg stArT-up of the drum diFfiCuLT.
fIG. 1 shows An Example of thE magnetiC tAPe traNsport Path coNfiguraTIOn IN such hElicAl sCan type VTrs aS dEScribed AbOvE.
in the fIgurE, 1 dEnotes A magneTIc taPE; 2, A drum; 3, guide posts; 4, a SupplY-SIde
magnetic coil to produce e lectricalenerg y.Mod er n sh ipsand other wate r born e vessels typically em ployse n siti v eelect ronic e q ui p m ent  t ofac il i ta te na vig ational , propulsi vean d other func t io ns. Ideall y,this equipme ntis dis po sed in awat ertig ht enc l osure,  such asac abinet or othe r co ntai ner, to protect t h ee quipment frombeingda m ag e d  by  wa ter.
Often ,howev e r, mois t ur e n one t heless accumu lates in th e  wa tertig ht  en c losure . For  e x amp le, the ele ctro nic equip ment w i thin th e  enclos ure ma y r equ irec oo li ng.  C o nse q ue ntl y , p ipes tha tde liver  wat e r o r ot her  liq uid t o cool the eq uip ment may  leak  such  liq ui d ins ide th e enc lo sure. Additiona lly,  becausea w at ert ig ht en c losure  ma y n ot be a irtight ,  hu mi d i t ymay enter the encl os u r e,  and may  conde n se  i n to stand in g w ater w ithin  the en closure. 
In or d er  t o solve  t his mo is tur e-a ccumu l atio n prob lem, sev eralm ethods of allo w ing or forcin g  t h e  a c cumu lat ed moisture  toe xitthee nc los u re ha ve be en at t empted. One such me th od inv olves  drilling orotherwisef o r ming wee p ho l es in the enclosu re bo ttom to al l ow accum ulate d moistu re to dra i n  therefr om.  Bu t,ane n cl osure employi n g  wee pholes m ayno long erbesuf fic ie ntly wate rtight f or  m an yapp licat i ons.
Add it ion al ly,  if t h e port ion o f th een c los ure inw hi c h  the  w ee p ho les  a re di spos e d b ecomessubmerged  or abut sth e floor , gravity-bas ed  drainageof  ac cumula t e d moistu re may not be an option . 
Moreov er,  alth ough  weep hol esallowdra i nage,they t ypica ll y c a n not g e n er ate  a  signal th a t  in dicat es  a m oisture  accumulation prob l emwithin the en clo sure . Th isi nv e nti on rel a t es to a helical  scan type  v i de o tape rec o rde rcapable  of pro vidin g  reliab le start- ups of it srevo l v ing  head drum .
Recent ly, for v i deo t a pe  reco rde rs (he re ina ftercalled VTR s), h elical  s can ty pe VT Rs  have co me to be widely employe d, and  arethu s used in  la r gequantitie s, n ot only as  co nsu mer o rie n ted m odel s ,the so-ca lled home VTRs ,  b uta l so  as open re e l typ e hel ica l  scanVTRs  using 1 inch wid e  magnetic tape  for b roa d-c a stin gand other prof ess io n a l applic at ions.
Thistype ofhe l icalscan V TR isnot onl y co m parabl e in  pe rformance  ca pa b ilities  t oc onvent iona l4 head  typeV TRs, b ut is characteri zed b y relat i vesimpl ic ity ofs truc ture and e ase in atta iningsmal l siz e and l ig ht wei ght .On the oth e r hand, i t ten ds to p re sent  aproble m in t hat t he m ag net ic tape s t i ck s  t ot herevo lving  h eaddrum (her e inaftercal l ed thedr um) , making st a r t-up of th e d rum d i f ficult.
FI G . 1s ho w s anexampl e of t he magn e tic  t ape tra nsp o r t path co nfigurati o n i nsuch  helical  s canty peVT Rs as described  above.In the f i g ure, 1  de n otes a magn et ic tape; 2,a dru m; 3, guid e pos ts; 4,a  su ppl y-s ide
magnetic coil_to produce_electrical energy. Modern ships_and other_waterborne_vessels typically_employ_sensitive electronic equipment_to facilitate navigational,_propulsive and other functions._Ideally, this equipment_is_disposed in a watertight enclosure, such as a cabinet or other container, to protect_the_equipment from_being_damaged_by water.
Often, however, moisture nonetheless_accumulates in the watertight enclosure._For example,_the electronic equipment within the enclosure may require_cooling._Consequently, pipes that_deliver water or other liquid to cool the equipment_may leak such liquid inside the_enclosure. Additionally, because_a_watertight_enclosure may not be_airtight, humidity may enter the enclosure,_and may condense into standing water_within the enclosure.
In order to solve this_moisture-accumulation problem, several methods of allowing_or forcing the accumulated moisture_to exit_the enclosure have been attempted._One such method_involves drilling_or otherwise forming_weep holes in the enclosure bottom_to allow accumulated_moisture to drain therefrom. But, an_enclosure_employing weep holes_may_no_longer be_sufficiently watertight for_many_applications.
Additionally, if_the_portion of the enclosure in which_the_weep holes are disposed becomes submerged or_abuts the floor, gravity-based_drainage_of accumulated moisture may_not be an option.
Moreover, although_weep holes allow drainage, they typically_cannot generate_a signal_that indicates a moisture accumulation problem within the enclosure. This invention_relates to a helical scan type_video tape recorder capable_of providing_reliable_start-ups of its_revolving_head drum.
Recently,_for video tape recorders (hereinafter called VTRs),_helical scan_type VTRs have come to be_widely employed, and are_thus_used in large quantities, not only_as consumer oriented models, the so-called_home VTRs, but also as_open_reel_type helical scan VTRs using_1 inch wide magnetic tape for_broad-casting and other_professional applications.
This type of helical scan VTR_is_not only comparable in performance capabilities_to_conventional 4 head type VTRs, but_is_characterized_by relative simplicity of structure_and ease in attaining small size_and light weight. On the other hand, it tends_to present a_problem in that the magnetic_tape_sticks_to the revolving head drum (hereinafter called the drum), making_start-up of_the drum difficult.
FIG._1 shows an example of the magnetic tape transport path_configuration in such helical scan type VTRs_as described above.
In the figure, 1 denotes a magnetic tape; 2,_a drum; 3, guide posts; 4, a supply-side