Note: Descriptions are shown in the official language in which they were submitted.
'0 90~16(~ '-"~ PCI~DIC90/00150
~ 2~i5515 ,-
~ ,.5,' ;
A gear-wheel drive for a cleaning cassette for u6e ln
cassette tape recorders.
~ he present invention relates to a cleanlng
cassette for cassette tape recorders comprislng a
cleanlng memher whlch upon placlng the cassette ln th~
tape recorder ls brought into e~gagement wlth lts
r2cordlng/reproducln~ h~ad iand whlch 1~ ~ub~ected to a
reciprocatlng cl~anlng movement across the recordlng
head by means o~ a plvot arm, one end of whlch 15
pivotal about a statlonary axis whlle the other end ls
connected wlth the cleaning member, said pivot arm
havin~ a ~lot en~aging an ~ccentrlc head connQcted
throut~h a tran~ml~nlon ~evlco with hub maan~ for ~n~a-
gement wlth r~poctlvQ ono~ o~ ~ha ooll driva oha~t~ o~
thc tapa rocar~r ln ~uch a mann~r tha~ tha clo~nin~
m~mbar by ro~atlon o~ ~n arbltrnry on~ o~ tho coll
drlv~ ~ha~t~ oP tha tapa racord~ ub~cted ~o ~ald
cleanlng movemant, the transml~lon device comprlslng
two mutually engaging driven gear-wheels one o~ which
carrles the eccentr~c head.
From DK patent No. lSl,656 such a cleanlng
cassette is known in which the cleaniny member is con-
nected to both coll drives of the cassette by means of
a gear-wheel arrangement including pinions communicat-
ing with respective coil drives and engaging an idle
; wheel connected with an eccentric cam device actuating
a pivot arm with which the cleaning member is con-
- nected.
US patent No. 4 ~16 485 deals with a gear-wheel
coupling wi~h two driven gear-wheels, providlng a rota-
tional directlon for the gear-wheel that i9 in engage-
ment with the pivot arm, lrre~pectlve o~ whlch o~ ~hecoil drivc sha~s 15 oporable ~urin~ th~ playl~ ~unc-
tion in a cassette tape recorder.
w~/1~ PCT/DK~00150
The above deslgns provlde ~or obtalning a
correct cleanlng functlon irrespective of the orien-
tation of the cleaning cassette when positioned ln the
tape recorder, but the transmlsslon devlces suffer from
the drawback that they establl6h a direct drlving`con-
nection from the first hub means to the second hub
means of the caa~ette, thereby cau~ln~ the motor o~ the
tape record~r to per~orm, throu~h the actlv~ coil drive
sha~t, not only th~ necos~ary motlve power ~or the
cleanlng cas~ette but also a suf~iclent motlve power
for the lndispensable co-rotatlon o~ the seconcl coil
drlve shaPt of the tape recorder and the transml6sion
devices connected therewlth.
~n a dovlcc discloo~d ln ~P patant No. 0,1~4,364
thls drawback ha~ boen ellmln~d ln tha~ tha rac.lproc~
atln~ movemont o~ ~he cl~anln~ ~ombor l~ provld~d by
m~an~ Or ~ ~prln~bla~d plvot arm actllatad by a ea~
d~vlce conn~ctad wl~h on~ o~ th~ hub m~an~, whll~
second plvot ~rm 1~ po~ltlo~ed b~twQon a holder for the
cleanin~ member and a cam devlce connected with the
second hub means in ~uch a manner that the second pivot
arm whlch ls not directly connected with the holder of
the cleanlng member by engagement between the second
hub means and the effective coil drive shaft of the
25 tape recorder may impart a forward rovement to the ~.
cleaning member against the spring bias force exerted
on the first pivot arm, whi~e the return movement is
solely effected by the spring bias force.
Thereby a direct drive connection f rom the f irst
to the second hub means of the cassette i~ avoided, but
the design of the transmission device with two separate
pivot arms in connection wlth the respective coil dri-
ves and a sprlng bias force acting solely on one o~ the
pivot arms involves a comparativ~ly wark con~umin~
mountin~ and ~hu~ alao increacQ~ the produc~ion price
of the cleaning cassette.
'`
.
WO 90/16064 PCTtDl~90/OOl~SO
r~
DK patent applicatlon No. 3820~88 likewlse deals
wlth a cleaning cassette ellminatlng the co-rotatlon o~
the second coll drlve shaft. Th~s i8 obtalned ln that a
first and a second plnion communicating with a respect-
S ive one of sa~d hub means are connected dlrectly orthrough an idle wheel, resp., with a respectlve one o~
two transfer gear-wheels independently rotatable about
a common axl~ and which via a respective one-way
coupllng devlc~ wlth the ~amo coupllng direction are
1~ connected with thc same cha~t pin rotatable about the
common axls and carrying the eccentric head.
The mechanical ~ountlng o~ this cassette is also
comparatively work-consuming, because gear-wheels, one~
way couplings and plvot arm being superpQ~od on three
l~v~13.
The obJeet o~ the lnvontl~n i~ to pro~id~ a
cl~anlng eaci~t~ o~ ~ho t~po eonc~rned ln whieh tho
~unetional ad~anta~ o~ tha lattor o~ ~h~ OVQ mon~
tion~d known de~l~n~ i~ m31ntalnad con~urr~ntly wlth
obtalnlng a ~impl~r mounting and a more sturdy deslgn
o~ the transmi3sion device, thereby further compens-
ating more easily ~or productional toleranc~s.
This is obtained according to the inventlon in
that the driven gear-wheels are arranged so as to be
used in a one-way coupling connection with a first and
a second pinion, resp., said one-way coupling being
provided in that the pinions are i~dividually mounted
axially displaceable on a threaded hub ~eans in engage-
ment with a coil drive shaft, thereby allowing displa-
cement between positions in which the pinion is inengagement and out of engagement, resp., with the
actual driven gear-wheel.
The invention will now be explained in more
detall with re~erence to ~he accompanying schematical
drawings, in which
~ ig. 1 15 a plane viow o~ a eleaning member wlth
an associated transmission device in an embodiment o~
the cleaning cassette accordin~ to the invention,
Wo ~/1~K~PCT/DK~J~t~
Fig. 2 ~5 a ~ectlonal vlew along the lines II~
in Fig. 1,
Fig. 3 16 a threaded h~a means accordlng to the ~ -
lnvention, ~;
Fig. 4 is a plane v~ew of a pinion in Fig. 2,
and
Fig. 5 is a sectional view o~ the plnion along
the llne V-V ln Fig. 4.
In the lllu~trat~d embodlm2nt a claaniny member
1 is mounted ln a holder 2 which ln a manner not
shown, e.g. by guide tracks ln the cassette walls is
controlled to effect reciprocatlng movement ln the
cleaning cass~tte ln the dlrectlon shown by arrows 3.
~his movcment cau~e~ th~ cl~aning memb~r, e.~. Pormed
as a ~elt pad moi~tened with cl~anln~ liquid, to a~oct
a sweeplng mov~mon~ acro~s ~ho rocordln~/raproducin~
head not ~hown o~ th~ ta~o racord~r ~nd o~ which thQ
cleanin~ m~mber i~ k~pt ~but~ln~ by a pr~ur~ ~prln~
4.
Holder 2 i~ connec~ed with the free end o~ a
pivot arm, 5 the oppo~i~e end o~ whlch 1~ plvotally
~ournalled on a pivot pin 6 secured on the ca~se~to.
The pivot arm 5 is provided with a slot 7 engaging
an eccentric head 8 supported on a driven gear-wheel
14 that is in firm engagement with the second driven
gear-wheel l6.
For the purpose of engagement with the coil
drive shafts, not shown, of the tape recorder the
cassette is provided with two huib means 10 and 11
~0 corresponding to the coil drive shafts ln a general
tape cassette. Each o~ the hub means 10 and 11 is
pro~ided with an external thread ~or engagement wlth
pins located lnternally o~ the pinions 12 and 13
~or axial dlsplacemen~ ~hereoe on hub mean~ 10 and
11, between position~ ln whlch pinions 12 and 13
engage or disengage, resp., the driven gear-wheels 14
and 16.
Wo ~/I~K~ PCT/DK~/~150
S~
~' .
When a hub means 10 or 11 upon plac~ng the
cassette in the tape recorder ls made to communicate
wlth the effective coil drive shaft thereof, the rota-
tion of hub means 10 or 11 in the usual dlrection
of rotation, shown by arrow 18 or 19, will dis`place
plnion 12 or 13 axially to engage the driven gear-
wheel 14 or 16, thereby also making eccentric head
8 to rotate so that pivot arm 5 i~ made to e~fect a
reciprocatlng pivoting mov~ment abou pi~ot pin 6,
thereby actuating cleaning member holder 2 to perform
the reciprocating sweeping movement illustrated by
arrows 3. The ot~er hub ~eans 11 or 10 is con-
nected to the non-e~fectlve coil drive ~haft of the
tapo recorder ln ~uch a manner that hub means ll or
stands ~tlll. As th~ corrc3pond~n~ pinion 13 or
12 by the drivon gaar-who~l 15 or 14 1~ rotat~d ln
th~ d~r~ctlon o~ ~rrow 1~ o~ ald plnlon 12 or
13 l~ dl~plac~d ~xlally ou~ oP ~n~ ent wlth thQ
associated driven g~ar wheal 1~ or 14 until lt gets
'20 stopped by abutting on th~ ca~ette wall or, in the
illustrated embodiment, on cam 20 protruding down-
wards there~rom.
~ his provides for obtaining that solely the hub
means which is in engagement with an effective coil
drive shaft in the tape recorder is made to rotate
without causing any co-rotation of the hub means that
is not connected to an effective coil drive shaft. In
fact, no driving connection is established between the
hub means through the cleaning cassette.
