GB2029933A - Improvements in pinch rollers for cassette tape recorders - Google Patents
Improvements in pinch rollers for cassette tape recorders Download PDFInfo
- Publication number
- GB2029933A GB2029933A GB7929413A GB7929413A GB2029933A GB 2029933 A GB2029933 A GB 2029933A GB 7929413 A GB7929413 A GB 7929413A GB 7929413 A GB7929413 A GB 7929413A GB 2029933 A GB2029933 A GB 2029933A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pin
- roller
- cavity
- combination according
- embossment
- 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.)
- Granted
Links
- 230000033001 locomotion Effects 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/26—Driving record carriers by members acting directly or indirectly thereon
- G11B15/28—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal
- G11B15/29—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal through pinch-rollers or tape rolls
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
Abstract
A pinch roller 10 for a magnetic tape recorder is mounted for rotary and tilting movement on a stationary pin 20 so as to be able to rotate on an axis parallel to that of the driving capstan. The roller has an axial cavity 12 of a diameter larger than that of the pin. <IMAGE>
Description
SPECIFICATION
Improvements in pinch rollers for cassette tape
recorders
The present invention relates to pinch rollers used in
magnetic tape recorders.
It is well known that the pinch roller is pushed
against the tape driving capstan so that the magnetic
tape gripped therebetween is driven by the capstan
thus passing on the reading and recording magnetic
heads of the cassette recorder.
The pinch roller usually comprises a cylinder
having a surface of a yield material and being
supported by a stationary shaft or pin integral with a
support that is movable from a position where the
roller is forced against the capstan to a position
remote therefrom.
With such a construction a problem arises in
having the capstan axis exactly parallel to the axis of
rotation of the idle pinch roller, which capstan
comprises a secion of a cylindrical rigid shaft that is
rotated at the desired speed.
As a matter of fact, if the two axes were not
parallel to each other, the tape would be released
from the gripping action exerted by the capstan and
pinch roller, thus moving either upwards or down
wards according to the angle formed therebetween.
The most obvious solution to the problem is to
provide the two axes as parallel to each other as
possible. This solution, however, has a drawback
firstly in the high costs for manufacturing elements
having extemely strict tolerances and secondly in
the strains to which elements such as spindles and
supports are subjected to in the long run.
Many solutions according to the prior art use
movable guides, such as rollers or pulleys which,
however, are costly and furthermore cannot be used
in cassette tape recorders.
Other solutions use stationary guides which, be
sides being costly, make the structure of the device
complex and are also excessively bulky to be used in
cassette tape recorders where the space available is
very reduced.
According to the present invention there is pro
vided the combination of a pinch roller and a
supporting pin for use in magnetic cassette tape
recorders to push the magnetici tape against the
driving capstan, wherein said roller has an axial cavity having a diameter larger than the diameter of
said supporting pin, except for an area of limited
axial dimension where said cavity and said pin are
usually pivotally engaged with each other, and
wherein said combination comprises stopping means allowing said roller to move angularly but
limiting the axial movements thereof with respect to
the pin, the parts being so arranged that said roller
can move angularly with respect to said pin so that it
can rotate about an axis of rotation parallel to the
I axis of rotation of said capstan.
The present invention will now be described in
greater detail, by way of example with reference to
the accompanying drawing, wherein:
Figure 1 is a diagrammatic axial sectional view of a
preferred embodiment of the pinch roller;
Figure 2 to 6 are similar sectional views of other embodiments; and
Figure 7 shows, in an exaggerated way, how a pinch roller accommodates a capstan inclined in respect to the geometric axis of the pinch roller support.
Referring to Figure 1 the pinch roller 10, comprises a cylindrical body 11 having an axial cavity 12 and an outer covering 13 of a yielding material that engages the tape to grip the same against the capstan (not shown).
A dome 14 made of a yielding material and having a downwardly open spheric cavity 15 therein is integral with the inner part of cavity 12 and, accordingly, cylinrical body 11.
The stationary pin supporting pinch roller 10 comprises a cylindrical body 20 having a smaller diameter than cavity 12 and carrying a head 21 on the upper end thereof. The head 21 has a diameter substantially equal to the diameter of the cavity 15 of the dome 14 and it is connected to the body 20 through a neck 22.
The stationary pin 20 is integrally formed with a movable flat support 23.
With such an arrangement the roller 10 can assume any inclined position with respect to pin 20 and particularly a suitable inclined position in which the roller 10 can rotate about an axis parallel to the axis of rotation of the capstan. Moreover, with such a construction, the roller 10, the cylindrical surface of which is pushed in engagement with the capstan (not shown) by movable support 23, will automatically incline to the position in which the axis of rotation thereof is immediately parallel to the axis of rotation of the capstan, through suitable angular movements of dome 14 in respectto head 21.
It will be seen that the construction of the embodi mentshown in Figure 1, by which the roller 10 can be fitted over support 20 by slightly forcing elastic dome 14 to fit over spherica head 21, gives the pinch roller the further advantage of being readily assembled without manual operations, thus reducing the manufacturing costs.
As will be seen from the drawing, the structure described with reference to Figure 1 is substantially the same as the embodiments shown in Figures 2, 3 and 4, with the only difference that these embodiments do not comprise the snap-on articulated joint between roller 10 and supporting pin 20.
The pinch roller and the respective supporting pin as shown in these Figures have such a structure as to allow the roller axis to rotate with respect to the pin axis. In these Figures identical parts similar to the parts of the embodiment shown in Figure 1 are indicated by the same numerals provided with A in
Figure 2, B in Figure 3 and C in Figure 4.
In the embodiment shown in Figure 2, the pinch roller 10A comprises an axial cavity 12A having an inner surface comprising two identical surfaces having the shape of two truncated cones placed on
upside down on top of the other and connected to
each other at the smaller bases thereof.
Accordingly, axial cavity 12B that receives pin 20 when the device is assembled, is flared and has
increasing diameters from the centre to the two ends thereof. When the pinch roller is not in operation the engagement of the cylindrical surface of the cavity with the pin 20A occurs at the middle part 16 having the smallest diameter.
The axial movement of pinch roller 10A with respect to the pin 20A are limited by upper and lower circlips 24 and 25 received into suitable grooves on the pinch roller 1 OA that also has two axially directed annular grooves 18' and 19' formed on faces 18 and 19 thereof.
Also with this structure roller 10A can rotate about any axis of rotation different from the geometric axis of pin 20A parallel to the axis of rotation of the capstan.
It will be evident to those skilled in the art that the foregoing also refers to the embodiments shown in
Figures 3 and 4.
With respect to Figure 3, thr axial cavity 12B of the
roller 1 OB has larger diameter than the pin 20B, but
an annular embossment 16B having a hole of a
diameter slightly larger than the diameter of the pin 20B protrudes from the cylindrical surface of this cavity. The axial movement of roller 1 OB with respect to the pin 20B also limited by circlips 24B and 25B in this embodiment.
The embodiment shown in Figure 4 is very similar to the embodiment of Figure 3, with the only
difference that the pin 20C is shorter and annular
embossment 16C projecting outwardly from the
surface of the axial cavity 12C of the roller is placed
between a circlip 24C carried by the upper end of the
pin 20C and a shoulder 25C forming the base
thereof.
The embodiments shown in Figures 5 and 6 are
basically identical with the embodiments described
above, with the difference that the larger engaging
surface of the stationary pin with the axial cavity of
the roller is a portion of the pin and not of the roller.
In these Figures the parts identical with or similar to
the parts shown in the preceding Figures are indi
cated by the same reference numbers provided with
a D and E, respectively.
In the embodiment of Figure 5 the surface of the
axial cavity 12D of the roller 10D is perfectly
cylindrical and receives a pin 20D having a larger
diameter at its centre 16D and decreasing diameters
towards the upper and lower ends thereof.
Circlips 24D and 25D carried by the top and the
bottom of the pin 20D limit the axial movements of
the roller 1 OD with respect to the pin 20D.
In the embodiment of Figure 6 both the inner
surface of axial cavity 12E and the outer surface of
the pin 20E are cylindrical and have different dia
meters. However, the pin 20E comprises an outward
ly protruding annular embossment 16E at its centre,
which embossment 16E has a diameter slightly
smaller than the cavity 12E.
Circlips 24E and 25E carried by the bottom and the
top of the pin 20E limit the axial movement of roller 1 OE with respect to the pin 20D.
it should be noted now that in all the embodiments
the engaging surfaces of the stationary pin with the
axial cavity receiving the same may have a more or
less convex profile in order to facilitate the inclining
movements of the roller with respect to the axis.
Claims (11)
1. The combination of a pinch roller and a supporting pin for use in magnetic cassette tape recorders to puch the magnetic tape against the driving capstan, wherein said roller has an axial cavity having a diameter larger than the diameter of said supporting pin, except for an area of limited axial dimension where said cavity and said pin are usually pivotally engaged with each other, and wherein said combination comprises stopping means allowing said roller to move anugularly but limiting the axial movements thereof with respect to the pin, the parts being so arranged that said roller can move angularly with respect to said pin so that it can rotate about an axis of rotation parallel to the axis of rotation of said capstan.
2. The combination according to claim 1, wherein the wall of said cavity of said roller has integral therewith a dome of a yielding material having an axially arranged spheric seat, and said pin comprises a spheric seat, and said pin comprises a spheric head arranged to be pivotally received in said spheric cavity, the unit comprising said dome and said head forming both said engaging area of limited axial dimension and said stopping means limiting the axial movements of said roller with respect to said pin.
3. The combination according to claim 1, wherein said axial cavity of said roller comprises two cavities having the shape of two truncated cones jonted in the middle at the smaller bases thereof forming said engaging area of limited axial dimension.
4. The combination according to claim 1, wherein said cavity comprises an inwardly protruding annular embossment at its centre, said embossment having a hole of a diameter larger than the diameter of said pin, forming said engaging area of limited axial dimension.
5. The combination according to claim 1, wherein said pin comprises two identical parts having the shape of two truncated cones joined in the middle at the larger bases thereof forming said engaging area of limited axial dimension.
6. The combination according to claim 1, wherein said pin comprises an outwardly protruding annular embossment having a diameter slightly smaller than the diameter of said axial cavity of said roller, said embossment forming said engaging area of limited axial dimension.
7. The combination according to claims 3 and 5, wherein said truncated-cone surfaces are fitted together by an arcuated surface.
8. The combination according to claim 4, where
in said stopping means limiting said axial move
ments of said roller with respect to said pin comprise a circlip placed on top of said pin and an embossment protruding outwardly from the bottom of said
pin and integral therewith, said annular emboss
ment of said roller being received between said circlip and said annular embossment.
9. The combination according to any one of
claims 3 to 7, wherein said stopping means comprise circlips placed on top of said pin and at the bottom thereof.
10. The combination according to any one of claims 3 to 8, wherein annular grooves are formed
on the two axially directed annular faces of said
roller.
11. The combination of a pinch roller and a
supporting pin for use in magnetic cassette tape
recorders, constructed substantially as herein de
scribed with reference to and as illustrated in any
one of Figures 1 to 6.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT50836/78A IT1105783B (en) | 1978-08-23 | 1978-08-23 | IMPROVEMENT IN THE PRESSER ROLLERS FOR BELT RECORDERS |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2029933A true GB2029933A (en) | 1980-03-26 |
GB2029933B GB2029933B (en) | 1982-11-03 |
Family
ID=11273956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7929413A Expired GB2029933B (en) | 1978-08-23 | 1979-08-23 | Pinch rollers for cassette tape recorders |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5577050A (en) |
DE (1) | DE2933965A1 (en) |
ES (1) | ES483516A1 (en) |
FR (1) | FR2434454A1 (en) |
GB (1) | GB2029933B (en) |
IT (1) | IT1105783B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002071401A1 (en) * | 2001-03-06 | 2002-09-12 | Koninklijke Philips Electronics N.V. | Magnetic-tape apparatus with a pressure-roller device and pressure-roller unit |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3009644A1 (en) * | 1980-03-13 | 1981-09-24 | Robert Bosch Gmbh, 7000 Stuttgart | DRIVE ARRANGEMENT FOR A MAGNETIC TAPE DEVICE |
JP2591062B2 (en) * | 1988-05-13 | 1997-03-19 | 松下電器産業株式会社 | Pinch roller device |
AT393331B (en) * | 1989-10-17 | 1991-09-25 | Philips Nv | PINCH ROLLER ARRANGEMENT |
DE69225957T2 (en) * | 1991-10-31 | 1998-10-22 | Sony Corp | TAPE CASSETTE |
AT397734B (en) * | 1992-06-26 | 1994-06-27 | Koninkl Philips Electronics Nv | MAGNETIC TAPE WITH A PRESSURE ROLLER DEVICE |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1031984B (en) * | 1954-03-17 | 1958-06-12 | Frieseke & Hoepfner Gmbh | Roller arranged in the film path and movable in all directions relative to the film plane |
US3310214A (en) * | 1964-03-09 | 1967-03-21 | Burroughs Corp | Tape drive mechanism |
US3424391A (en) * | 1967-02-23 | 1969-01-28 | Burroughs Corp | Free-positioning alignment bobbin |
US3662937A (en) * | 1970-03-06 | 1972-05-16 | Minnesota Mining & Mfg | Magnetic tape pressure roller |
US3658227A (en) * | 1970-04-03 | 1972-04-25 | John F Stephens | Tape guide spindle |
US3980207A (en) * | 1974-12-19 | 1976-09-14 | Mario Maccaferri | Pinch rollers |
-
1978
- 1978-08-23 IT IT50836/78A patent/IT1105783B/en active
-
1979
- 1979-08-21 ES ES483516A patent/ES483516A1/en not_active Expired
- 1979-08-22 DE DE19792933965 patent/DE2933965A1/en not_active Withdrawn
- 1979-08-23 JP JP10803979A patent/JPS5577050A/en active Pending
- 1979-08-23 FR FR7921220A patent/FR2434454A1/en active Pending
- 1979-08-23 GB GB7929413A patent/GB2029933B/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002071401A1 (en) * | 2001-03-06 | 2002-09-12 | Koninklijke Philips Electronics N.V. | Magnetic-tape apparatus with a pressure-roller device and pressure-roller unit |
Also Published As
Publication number | Publication date |
---|---|
IT7850836A0 (en) | 1978-08-23 |
DE2933965A1 (en) | 1980-03-06 |
ES483516A1 (en) | 1980-09-01 |
GB2029933B (en) | 1982-11-03 |
IT1105783B (en) | 1985-11-04 |
JPS5577050A (en) | 1980-06-10 |
FR2434454A1 (en) | 1980-03-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |