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Патент USA US3057303

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Oct. 9, 1962
R. |_. ZUROWSK!
3,057,293
WEB FEEDING CORRECTION DEVICE
Filed Jan. 10, 1961
5 Sheets-Sheet l
1
FIG.
INVENTOR.
RUDOLPH L. ZUROWSKI
A T TORNE Y
Oct. 9, 1962
R. |_. ZUROWSKI
3,057,293
WEB FEEDING CORRECTION DEVICE
.
Filed Jan. 10, 1961
15 24
6 k J A
I/IIIIIIIIII'"
.41" "
13
FIG. 2
5 Sheets-Sheet 2
Oct- 9, 1962"
R. 1.. ZUROWSKI
3,057,293
WEB FEEDING vCORRECTION DEVICE
Filed Jan; 10, 1961
FIG. 3
5 Sheets-Sheet a
Oct. 9, 1962
R. 1.. ZUROWSKI
3,057,293
WEB FEEDING CORRECTION DEVICE
5 Sheets-Sheet 4
Filed Jan. 10, 1961
21
4 68
FIG. 4
560°
FIG. 7
Oct. @9, .1962
R. |_. ZUROWSKl
3,057,293
WEB FEEDING CORRECTION DEVICE
Filed Jan. 10, 1961
5 Sheets-Sheet 5
tes
atent O " 1C6
3,057,293
Patented Oct. 9, 1962
1
2
3,057,293
In the preferred embodiment the detection means is a
lever mechanism carrying a mechanical sense element posi
tionable to rest on a guide member for the moving web.
WEB FEEDING €0RRECTION DEVICE
Rudolph L. Zurowski, Endicott, N.Y., assignor to Inter
national Business Machines Corperation, New York,
N.Y., a corporation of New York
Filed Jan. 10, 1964, Ser. No. 81,747
12 Claims. (all. 1tlI---336)
The sense element assumes either of two positions de
pendent on the presence or absence of the web at the home
position. In accordance with the position taken by the
sense element, the lever mechanism will assume corre
sponding ?rst and second positions. An interposer means
operated on by the detection lever is adapted to enable or
This invention relates to feeding devices and particu
larly to a correction device for controlling the alignment 10 disable a restore mechanism adapted to apply a restora
tion force to the moving web. In the preferred form the
of a moving web.
restoration mechanism is a pivotally mounted lever mech
While not necessarily limited thereto, the present in
anism carrying a friction roller having its axis of rota
vention is particularly related to a means for correcting
tion skewed relative to the direction of force for ad
the alignment of an ink ribbon useful in a printer appa
15 vancing the web. Both the detection and the restoration
ratus.
In on-the-?y printers of the type commonly referred
to as a chain printer, a plurality of uniformly distributed
type members are movable along a print line opposite
mechanisms are operated periodically by the cyclically
operated portions of the ribbon or web drive mechanism.
It will be appreciated that a correction device has been
provided which is simple in construction, reliable in op
hammers selectively operated to strike predetermined 20 eration, and which is eifective when incorporated in an
on-the-?y printer to eliminate wrinkling of the ink rib
ones of the type members at predetermined printing posi
bon web so as to attain improved print quality.
tions along the print line.
The foregoing and other objects, features and advan
In a chain printer of the type referred to as a back
which are positioned a plurality of uniformly spaced print
tages of the invention will be apparent from the following
printer, a print couple comprising an ink ribbon and a
print medium strip are fed between a plurality of such 25 more particular description of a preferred embodiment
of the invention, as illustrated in the accompanying draw:
type hammers and the type members. The imprint in
ings.
the print medium is obtained by striking the print me
dium and ribbon against the moving type members of
In the drawings:
FIG. 1 is an isometric view of a printer apparatus show
the chain.
In one embodiment of such a printer, the type elements 30 ing a ribbon feed device incorporating the present inven
are moving along a horizontal print line while the print
tion.
FIG. 2 is an elevation view of a portion of FIG. 1
medium and ink ribbon are fed transversely to the direc
tion of type motion, the print medium being fed prefer
ably step by step and the ink ribbon {being fed continu
ously. Under such conditions of operation the ribbon
due to frequent contacts with the type members is sub
jected to a lateral drag force which causes misalignment.
showing the ribbon feed and alignment device of the pres
ent invention in one condition of operation.
‘
FIG. 3 is the same as FIG. 2 showing a second condi
tion of operation.
FIG. 4 is an end elevation of the correction device of
the present invention as seen from the right of FIG. 2.
FIG. 5 is an elevated view of the ribbon detection
vice. Previous correction devices and techniques for 40 mechanism of the correction device as shown in FIG. 2.
vFIG. 6 is an elevated view of the ribbon restoring mech
maintaining the alignment of the transversely fed ribbon
anism of the correction device as shown in FIG. 2.
have proved unsatisfactory. Wrinkling and creasing of
FIG. 7 is a time chart showing the operation sequence
the ribbon followed by cutting on impact with the em
Such misalignment left uncorrected eventually produces
poor print quality and jamming of the ribbon feed de
bossed metal type characters resulting in defective print
of the detection and restoring mechanisms of the present
ing and printer operation frequently resulted.
invention.
.
‘
Referring to FIG. 1, a printer apparatus is shown com
prising an endless chain belt 10 carrying a plurality of
equally spaced type members 11 thereon. The chain belt
and disadvantages.
10 may be part of a cartridge assembly which includes
It is a more particular object of the present invention
of providing means for correcting for misalignment of 50 spaced apart gear members 12, one of which may be driven
It is therefore an object of the present invention to pro
vide means for eliminating or reducing the above defects
a continuously fed web such as an ink ribbon which is
subjected to misaligning forces during feeding.
' by a suitable power mechanism (not shown) and chain
guide plates 13. A record strip 14 is adapted to pass from‘
supply roll 15 over strip guide members 16 and 17 and to
‘It is a further object of the present invention to provide
be advanced step by step by conventional means including
means for correcting for misalignment of an ink ribbon
being fed in a printer device.
55 sprocket wheels 18 connected to drive pulley 19.
Printing of characters represented by the type members
It is a still further object of this invention to provide a
'11 on record strip 14 is accomplished by a plurality of
web correction device which is simple and operably reli
type hammers 20 equally spaced at a plurality of print
able.
positions along a print line parallel to the path of travel
These and other objects are attained in accordance with
of the chain belt 10. The operation of the hammers 20 is
the present invention by providing a correction device
preferably under control of a system adapted to identify
which periodically subjects a continuously moving web
the various type members 11 as they appear at predeter
to a force transverse to its direction of motion in op
mined print positions and a storage device which identi?es
position to a counter transverse force causing it to be dis
the character to be printed at the corresponding print posi-'
placed from a lateral home position. In general the cor
rection device of the present invention comprises means 65 tion. A suitable system for effecting such control may be,
seen by reference to application of Fred M. Demerv and
for detecting the presence or absence of a moving web
from a lateral home position, aligning means for applying
Edward J. Grenchus, Serial No. 844,511, ?led October 5,
a force restoring the web to the lateral home position in
1959, now US. Patent No. 2,993,437.
4
An ink ribbon 21 is fed from supply roll 22 over lower
opposition to a lateral disaligning force, means for peri
odically initiating the operation of the detection and re 70 guide bar 23 past the face of the chain belt‘ 10, over car
tridge plate 13 forward and rearward‘ guide plates 24 and
storing means in timed relation with the advance of the
25
to winding roll 26. The feeding of the ribbon 21 is
web.
3,057,293
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effected by a constant speed electric motor 27 connected
ribbon 21. For this purpose a cam roll 70 is mounted on
the face of reduction gear 29. As reduction gear 29 ro
by shaft 28 to a reduction gear 29 through gears 30 and
31 connecting reduction gear 29 to ribbon roll drive gears
32 and 33 on shafts 34 and 35 respectively.
In the environment in which the present invention is
tates counterclockwise, roller 21) is brought successively
into contact with cam surface 59 of detection lever 54 and
cam surface 49 of restore lever 40.
The operation of the correction device of the present
understood, the feeding of ribbon 21 is continuous. The
ribbon 21 also moves past the print line transverse to the
invention can be understood more clearly in connection
with reference to FIG. 7. Assuming that the sense ele
direction of movement of the chain belt 10. In the con—
ment 56 is resting on the upper surface of guide member
templated use of the present invention, the type chain 10
is continuously moving and printing occurs on-the-?y, i.e., 10 25 and ribbon 21 has been displaced from its lateral
position where it would be in contact with the sense ele
the type hammers 20 strike the strip 14 (Which is stationary
ment 56, assuming further that friction roll 42 has been
during printing) and moving ribbon 21 against the moving
placed on the upper surface of ribbon 21, the detection and
type 11. Each time the ribbon 21 contacts the moving
restoring mechanisms of the correction device is as shown
type members 11, an instantaneous force is applied to the
‘ribbon 21 causing it to advance laterally. Where the print 15 in FIG. 2. At that time the interpo-ser pawl mecha
nism 61b is elevated by pin 65 on detection lever 54 so that
notch 64 is above stop edge 50 of restore lever 49. As
ribbon 21 is wound on roll 26, the cam roll 70 on gear
29 is caused to be rotated counterclockwise until such
ing occurs at a high number of operations per second such
as where a large number of print hammers 20 is em
ployed, the net effect is to apply a substantially continuous
lateral or drag force to the ribbon 21 tending to displace
it laterally.
20 time as the surface of roller 70 contacts cam surface 59 on
- To compensate for the lateral displacement of the rib
bon 21 means is provided for restoring it to a predeter
mined lateral or home position at periodic intervals during
the feeding of the ribbon 21 from roll 22 to roller 26.
The mechanism for accomplishing this may be seen by 25
reference-to FIGS. 1 through 6.
The restoring mechanism comprises a lever 40 mounted
on a stationary pivot 41 and carrying at its upper end a
friction restoring roll 42. Friction roll 42 is mounted by
arm 58 of detection lever 54. Assuming that ribbon 21
has been restored to its lateral home position so that it
is in contact with sense element 56 when cam roller 70
engages camming surface 59 of detection lever 54, the
lever 54 will be lifted so that sense element 56 is ele
vated above the surface of guide plate 25. As cam roller
71} continues to rotate, it will pass beyond cam surface 59
causing lever 54 to rotate counterclockwise to lower sense
element 56 onto the upper surface of ribbon 21. At that
shaft 43 to a bracket 44 which is attached to the upper 30 instant, the motion of the ribbon 21 produces a turning of
element 56 so that it no longer supports the upper end of
end of lever 40 by such means as a bolt 45 or the like.
lever 54. Lever 54 will continue to turn counterclockwise
The shaft 43 of friction roll 42 is skewed relative to the
until the contoured portion thereof engages pivot 41. Pin
65 carried by lever 54 will have been dropped to a position
to the ribbon to effect its windup on roll 26 is converted
through skewed roll 42 to a lateral restoring force oppos‘ 35 where it no longer engages the under side of spring 62 on
direction of travel of ribbon 21. Thus, the force applied
ing the displacement force of type chain 10. Guide plate
25 under the ribbon 21 serves to back up the friction roll
42 when lever 40 is rotated counterclockwise about its
pivot 41. A spring 46 is anchored at one end to a frame
pawl 60. The action just described is illustrated in FIG.
7 in curve I by the portions 80 and 81 respectively. As
the gear 29 continues to rotate from the position where it
engaged camming surface 59 and beyond it some interval
47 and is connected at the other end by pin 48 to the 40 later, for example, 120” of rotation, roller 70 comes into
lower arm of lever 40 and operates to bias lever 40 toward
contact with the ribbon 21 on guide plate 25. The lower
end of restore lever 40 is provided with a curved edge 49
adapted to be cam operated to rotate lever 40 around pivot
41 against the bias of spring 46.
contact with surface 49 of restore lever 40. At that time,
friction roll 42 is in contact with the upper surface of
ribbon 21 and is applying a restoring force toward the
lateral home position. The‘ continued rotation of gear 29
Intermediate its ends, 45 causes roller 70 to move across surface 49 of restore lever
40 causing it to rotate clockwise around pivot 41 against
restore lever 40 is bent to provide a stop or lock edge 50‘.
the action of spring 46 lifting roller 42 out of contact with
The friction roll 42 may be provided with a ratchet 51,
the ribbon 21. By rotating the lever 40 clockwise about
and a pawl 52 mounted on bracket 44 is cooperable with
pivot 41 roller 711 moves the locking edge 50 of lever 40 to
ratchet 51 to prevent the reverse rotation of roll 42 when
the left a sufficient degree to permit the pawl 65‘ to move
the direction of motion of the ribbon 21 is reversed should 50
counterclockwise around pivot 61. Thus, the notch 64,
such be desired.
since there is no support of the pawl by pin 65 through
_ As was previously stated, the restoration of the ribbon
spring 62 will drop below the edge 50 of lever 40. As
21 to ‘a predetermined lateral home position is performed
the roller 70 advances beyond the cam surface 49 of lever
periodically if needed. The means for detecting the dis
40, spring 46 applies a biasing force causing lever 40
placement of the ribbon 21 from the lateral home posi-‘ 55 to be rotated in a counterclockwise direction. However,
tion comprises a detection lever 54 supported at one end
notch 64 of pawl 60 is in position to engage stop surface
by stationary pivot 55 and carrying at its other end a de
50 thereby preventing the rotation of lever 40 so that
tection element 56 freely rotatable about a horizontal shaft
friction roll 42 remains out of contact with ribbon 21.
57. The detection lever 54 is provided intermediate its
The correction device mechanisms are now in the condi
ends with a downwardly extending arm 58 having a curved 60 tion illustrated in FIG. 3 and the operation of the restor
camming edge 59 adapted when engaged to effect the ro
ing device just described is illustrated in FIG. 7 by sections
tation of the detection lever 54 clockwise around pivot 55.
87, 84, and 85 of curve II.
The upper end of detection lever 54 is preferably con
Assuming that the ribbon has now been displaced lateral
toured so as to have its counterclockwise rotation limited
ly from its home position so that sense element if dropped
by pivot 41 of restore lever 40. A pawl 60 is mounted to 65 on ‘guide plate 25 would not come in contact with the
?xed pivot 61, which is suitably anchored to frame 47.
ribbon as gear 29 completes its ?rst revolution and is
A leaf spring 62 connected to the pawl 60 by screw 63
approaching 360° on the time chart of FIG. 7, a cycle of
extends ovei the upper end of the pawl and beyond its left
operations is performed which will initiate the restoration
end. A detent 64 in the lower left end of pawl 60 is pro
of the ribbon to its lateral home position. First ‘cam roll
vided for engaging the stop section 50 of restore lever 40. 70 70 on gear 29 contacts cam surface 59 on lever 54. The
A pin 65 attached to the inner surface of detection lever
upper end of the lever 54 is rotated clockwise and sense
54 extends outwardly to be engageable when rotated clock
element 56 which is freely rotatable on pivot 57 is caused
wise with the under side of leaf spring 62.
to rotate clockwise and to be held in a substantially verti
. The operation of the detection and restoring mecha
cal position. Pin 65 engages the lower edge ‘of leaf spring
nisms is performed in timed relation with the feeding of 75 62 and causes it to be ?exed clockwise about its point of
3,057,295
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5
r
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attachment on pawl 63. The pawl 60, however, is not
free to rotate clockwise with the spring 62 around pivot
force, means for periodically initiating the operation of.
said detecting and restoring means in timed relation
61 since notch 64 is in contact with surface 50 of restore
lever 40 which is biased by spring 46. As roller 70 moves
under camming surface 59 of lever 54, it permits the lever
with the advance of said ribbon element, and means
responsive to said detecting means for enabling or dis
abling the operation of said restoring means in accord—
54 to rotate counterclockwise until sense element 56 comes
ance with an absence or presence indication by said detect
to rest on the upper surface of guide member 25. Since
ribbon 21 is not in its lateral home position, sense ele
ment 56 will retain the lever 54 in a higher position indi
cated by section 83 in curve I. Thus the detection lever 54
is in position calling for the application of a restoring force
ing means.
by the friction roll 42. However, such application must
await the rotation of cam roller 70 through approximately
transverse to the direction of travel of said ribbon, means
120° where it comes into contact with cam surface 49 of
lever 40.
4. In an apparatus having a ribbon element or the like
and means for moving said ribbon at a continuous rate
of travel in a ?rst direction past a work station, ribbon
element being subjected to a disalignment force operable
{for correcting for the disalignment of said ribbon ele
ment comprising detection means operable for detecting
As a result of such action, restore lever 40 15 the presence or absence of said ribbon from a lateral
home position including a detection lever and a sense
is ?rst rotated clockwise about pivot 41 against the bias
element carried thereby, said detection lever being posi
of spring 46. At thistime, pawl 60 is released from con
tionable to place said sense element at said lateral home
tact with locking surface 50, consequently, pawl 60 will
position, means for applying a restoring force in opposi
turn clockwise about pivot 61 to follow its leaf spring 62
which has been previously de?ected by pin 65 of lever 54. 20 tion to said disalignment force including a restore lever
and a roller carried thereby, said lever being movable for
As indicated in section 86 of curve II in FIG. 7, roller
placing gsaid roller into Opposition force applying contact
70 moving beyond the point of contact with surface 49 of
with said ribbon, means for periodically opera-ting said
lever 40 causes the restore lever 40 to rotate counter
detection lever and said restore lever in succession in
clockwise around pivot 41. The friction roll 42 is thus
lowered into contact with the upper surface of ribbon 21 255 timed relation with the advance of said ribbon for suc
cessively placing said sense element in said home posi
and operates to convert the translational force applied to
tion and for positioning said restore lever in preparation
the ribbon to a lateral displacement force which restores
for the application of said roller to said ribbon, and
the ribbon to the lateral home position. This operation is
indicated in section 86 of curve II, FIG. 7. On the next
means controlled by said detection means for enabling
cycle of roller 70, the ?rst described operation is repeated 30 ' ‘and disabling said restore means including a pawl mecha
nism operable by said detection lever for freeing or in—
if the ribbon 21 has been fully restored to its lateral
home position.
'
While the invention has been particularly shown and
described with reference to a preferred embodiment there
hibiting said restore lever for movement effective to apply
said restore roller to said ribbon in accordance with the
condition of said detection lever determinable by said
of, it will be understood by those skilled in the art that 35 sense element.
5. In an apparatus having a ribbon element or the like
the foregoing and other changes in form and details may
and means for moving said ribbon at a continuous rate
be made therein without departing from the spirit and
of travel in a ?rst direction past a work station, said rib
scope of the invention.
bon element being subjected to a disaligning force trans
‘What is claimed is:
1. In an apparatus having a ribbon element or the like 40 verse to the direction of travel of said ribbon, means
for correcting for the disalignment of said ribbon com
and means for moving said ribbon at a continuous rate
prising detection means operable for determining the
of travel in a ?rst direction past a work station, said:
absence or presence of said ribbon from a lateral home
ribbon element being subjected to a disaligning force
position including a detection lever movable to ?rst and
transverse to the direction of travel of said ribbon, means
for correcting for the disalignment of said ribbon com 45 second positions and a sense element carried thereby,
prising a sensing mechanism periodically operable in
said sense element being de?ectable by said moving rib
timed relation with the advance of said ribbon element
bon to control the movement of said detection lever from
said ?rst to said second control positions, means for
for sensing the displacement of said moving ribbon ele
restoring said ribbon to said home position including a
ment from a lateral home position, and means operable
in response to an absence indication by said sense means 50 lever movable so as to assume ?rst and second restoring
positions and a restore force applicator carried thereby,
means for periodically initiating the movement of said
detection lever and said restore lever in timed relation
2. In an apparatus having a ribbon element or the like
with the advance of said ribbon whereby said sense ele
and means for moving said ribbon at a continuous rate
of travel in a ?rst direction past a work station, said 55 ment is placed at said home position and said restore
lever is prepared for placing of said roller on said ribbon,
ribbon element being subjected to a disalignment force
for restoring said moving ribbon to said lateral home
position in opposition to said disalignment force.
transverse to the direction of travel thereof, means for
and means controlled by said detection lever for en
correcting for the disalignment of said ribbon compris
abling and disabling the operation of said restoring means
including a pawl mechanism movable to ?rst and second
ing a means operable for detecting the presence or
absence of said moving ribbon element from a home posi 60 positions to free and lock said restore lever in accord
ance with the control position assumed by said detection
tion, means operable for restoring said ribbon to said
lever under the control of said sense element.
home position in accordance with an absence indication
6. In a printer apparatus having a printing mechanism
from said detection means, and means for periodically
including type elements movable at a continuous rate of
initiating the operation of said detection and restoring
means in timed relation to the advance of said ribbon
element.
3. In an apparatus having a ribbon element or the like
and means for moving said ribbon at a continuous rate
of travel in a ?rst direction past a Work station, said
speed along a print line, hammer elements arranged along
65 said print line and being operable for striking said mov
ing type elements, and a ribbon element movable trans
verse to the direction of motion of said type elements
and adapted to be moved by said hammer elements into
repetitive contact with said type elements, the combina
transverse to the direction of travel thereof, means for 70 tion comprising means for advancing said ribbon ele
ment in a direction transverse to said print line at a
correcting for the disalignment of said ribbon element
continuous rate of travel, and means operable periodically
comprising means operable for detecting the presence or
by said ribbon advancing means in timed relation with
absence of said moving ribbon element from a lateral
the advance of said ribbon element for correcting for the
home position, means operable for restoring said ribbon
to said home position in opposition to said disalignment 75 disalignment of said ribbon from a lateral home position.
ribbon element being subjected to a disalignment force
3,057,293
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7. In a printer apparatus having a printing mechanism
including type elements movable along a print line, ham
mer elements arranged along said print line and being
operable for striking said moving type elements, and a
jectable at said work station to a disaligning force trans
verse to said direction of travel, means operable for
detecting the presence or absence of said advancing rib
bon element from a lateral home position, means oper
able for restoring said ribbon to said home position in
ribbon element movable transverse to the direction of
motion of said type elements and adapted to be repeti
accordance with an absence indication from said detect
tively brought into frictional contact With said type ele
ing means, and means operable by said ribbon advancing
means for periodically initiating the operation of said de
ments by said hammer elements, the combination com
tection and restoring means in timed relation with the
prising means for advancing said ribbon element trans
verse to the direction of motion of ‘said type elements, 10 advance of said ribbon element.
11. In an apparatus having a ribbon element or the like
means for detecting the presence or absence of said rib
in accordance with claim 5 in which said means for peT
bon element from a home position, and means for re
riodically initiating the movement of said detection lever
and said restore lever in timed relation With the advance
moving type elements, said detection means and restor~ 15 of said ribbon includes means operable by said ribbon
moving means.
,
_v
ing means being operable by said ribbon advancing means
storing said ribbon to said home position in opposition to
disalignment caused by contact of said ribbon and said
12. In an apparatus having a ribbon element or the
_
like in accordance with claim 11 in which said means
8. In a printer apparatus of claim 7 in which said re
storing means includes a means for converting the force
operable by said ribbon moving means includes a cam
for advancing said ribbon past said print line into a re 20 member adapted to actuate said detection lever and said
storing force transverse to the direction of advance of
restore lever in succession and in timed relation with the
said ribbon.
advance of said ribbon.
9. In a printer apparatus of claim 8 in which said force
in timed relation with the advance of said ribbon.
conversion means includes a roller means frictionally en
gaging a surface of said ribbon element at a point beyond 25
said contact with said type element, said roller means hav
ing an axis of rotation displaced at an angle to a line
transverse to the direction of travel of said ribbon.
10. In an apparatus having a ribbon element or the
like the combination comprising means for advancing 30
said ribbon at a continuous rate of travel in a ?rst direc
tion past a Work station, said ribbon element being sub
References Cited in the ?le of this patent
UNITED STATES PATENTS
642,141
1,769,687
1,995,462
2,297,858
2,485,254
Lyon ________________ __ Jan. 30,
Hamilton ____________ __ July 1,
Tandel _____________ __ Mar._ 26,
Andreotto ____________ __ Oct. 6,
Brewster ____________ __ Oct. 18,
1900
1930
1935
1942
1949
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