CA1078668A - Printing press - Google Patents
Printing pressInfo
- Publication number
- CA1078668A CA1078668A CA282,286A CA282286A CA1078668A CA 1078668 A CA1078668 A CA 1078668A CA 282286 A CA282286 A CA 282286A CA 1078668 A CA1078668 A CA 1078668A
- Authority
- CA
- Canada
- Prior art keywords
- roll
- axle
- side frame
- printing machine
- bearing
- 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.)
- Expired
Links
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Rotary Presses (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A printing roll is mounted in a printing machine in such a way that a sleeve on its outer surface can be removed axially while the roll remains substantially in its working position. One end bearing of the roll is free of axial restraint relative to the roll and is removably secured to a side frame of the machine. For axial positioning, an adjustable restrainer engages the roll axle at that end. Beyond the other side frame a counterpoise acts on the roll axle to support the roll when the one end bearing is removed. The counterpoise may be a hydraulically operated pull roll, permanently engaged to the roll axle through a yoke and a rolling contact bearing.
A printing roll is mounted in a printing machine in such a way that a sleeve on its outer surface can be removed axially while the roll remains substantially in its working position. One end bearing of the roll is free of axial restraint relative to the roll and is removably secured to a side frame of the machine. For axial positioning, an adjustable restrainer engages the roll axle at that end. Beyond the other side frame a counterpoise acts on the roll axle to support the roll when the one end bearing is removed. The counterpoise may be a hydraulically operated pull roll, permanently engaged to the roll axle through a yoke and a rolling contact bearing.
Description
7~
FIELD OF THE INVE~TION
. .
This invention relates to printing presses of the type in which the printing roll is provided with a removable sleeve. These rolls are used e.g. in flexographic printing for transferring an image to the substance being printed~
BACKGROUND OF THE INVEMTION
Printing sleeves are removable from the rolls by various known means, some employing air under pressure (see U.S. Specification No.3146709) and others radial expansion upon axial contraction 5see U.S.
Specification No.2450727). In particular there has recently been proposed the use of rolls where the core is of different diameters at its two ends, with a corresponding difference on the interior of the sleeve, with air pressure Vents from the core.
The use of such sleeves opens up the need for a printing machine in which the sleeve removal can be carried out in situ on the machine itself.
When a new image is to be printed a new sleeve is provided and in the past this has meant the removal of the complete roller from the printing machine and ~ its subsequent replacement after the sleeve has been -; changed. It is further necessary to re-adjust the contact pressures between the sleeve and the : ~ .
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, ' , .
. _ ! . , .. . ,. ' . . ~ ' ~ . . ' ~ . . . .~
:~7~
impression cyllnder and the sleeve and tne inking ..
roller. All of these operations are costly, both in ~ ;
terms of labour charges and of unproductive or down- ~ .
time of the printing machine~ -: SUMMA Y OF THE INVENTION
~ .. .
A considerable part of these expenses are avoided if the printing sleeves of all types are changed while the printing roll remains in the printing ..
machine and enabling this is the subject of the present invention.
According to one aspect of the present invention therefore, there is provided a printing machine having at least one printing roll with a removable sleeve which provides its printing surface, the roll being .. . .
journalled in side frames of the machine one beyond each axial end of the roll by bea:rings in the respective side frames, the bearing in one of those .~ frames being removable from the side frame and :
.
irom the roll so as to allow for operations to be . ~ 20 carxied out upon the roll from that axial end, and . means beyond the other side frame for counterpoising :~ ~ : tha roll when the ramovable bearing has been removed. :
.i , . . . . .
. ~
~;: In another aspect of the invention there is ~ :.
.`. provided a method of changing a sleeve upon a printing ;
~: roll which is borne in journals i.n a printing machine . .
,- . .
- : which consists of removing one only of the journals .j ~ :, .
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, ` :- ~ ~', ~ '.
;
FIELD OF THE INVE~TION
. .
This invention relates to printing presses of the type in which the printing roll is provided with a removable sleeve. These rolls are used e.g. in flexographic printing for transferring an image to the substance being printed~
BACKGROUND OF THE INVEMTION
Printing sleeves are removable from the rolls by various known means, some employing air under pressure (see U.S. Specification No.3146709) and others radial expansion upon axial contraction 5see U.S.
Specification No.2450727). In particular there has recently been proposed the use of rolls where the core is of different diameters at its two ends, with a corresponding difference on the interior of the sleeve, with air pressure Vents from the core.
The use of such sleeves opens up the need for a printing machine in which the sleeve removal can be carried out in situ on the machine itself.
When a new image is to be printed a new sleeve is provided and in the past this has meant the removal of the complete roller from the printing machine and ~ its subsequent replacement after the sleeve has been -; changed. It is further necessary to re-adjust the contact pressures between the sleeve and the : ~ .
~ : ~ .
` :
, ' , .
. _ ! . , .. . ,. ' . . ~ ' ~ . . ' ~ . . . .~
:~7~
impression cyllnder and the sleeve and tne inking ..
roller. All of these operations are costly, both in ~ ;
terms of labour charges and of unproductive or down- ~ .
time of the printing machine~ -: SUMMA Y OF THE INVENTION
~ .. .
A considerable part of these expenses are avoided if the printing sleeves of all types are changed while the printing roll remains in the printing ..
machine and enabling this is the subject of the present invention.
According to one aspect of the present invention therefore, there is provided a printing machine having at least one printing roll with a removable sleeve which provides its printing surface, the roll being .. . .
journalled in side frames of the machine one beyond each axial end of the roll by bea:rings in the respective side frames, the bearing in one of those .~ frames being removable from the side frame and :
.
irom the roll so as to allow for operations to be . ~ 20 carxied out upon the roll from that axial end, and . means beyond the other side frame for counterpoising :~ ~ : tha roll when the ramovable bearing has been removed. :
.i , . . . . .
. ~
~;: In another aspect of the invention there is ~ :.
.`. provided a method of changing a sleeve upon a printing ;
~: roll which is borne in journals i.n a printing machine . .
,- . .
- : which consists of removing one only of the journals .j ~ :, .
Z ~ ' ' , . .:
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;
2 - .
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from the roll so as to leave that end of the roll axially accessible, counterpoising the mass of the roll by applylng downward pressure beyond the other o~ the journals to an axl~ extendin~
from the roll, removing a sleeve from the roll by axial movement over the said end of the roll, replacing the sleeve by a fresh sleeve and repositioning the first mentioned journal in the printing machine.
DESCRIPTION OF T~ DRAWINGS A~D OF A PREFERRED EMBODIME~T
~ particular embodiment of the invention and method of carrying it out will now be descrlbed with :
reference to the accompanying drawings wherein -Figs. 1,2 and 3 show in side elevation and partial`
section three successive stages in carrying out the method, ;
Fig.4 is a side view, on a larger scale~ of a counterpoising means, Fig.5 is a sectlon of a removable journal, and Fig.6 is a section~on the line VI-VI of Figure 5, -~
some parts being ur-ther cu~-away. `
~ ~ ~ Figure 1 shows diagrammatically the normal working ; ~ condition of a printing machine with a printing roll ~ 1 fitted with a demountable printing sleeve and in . .
position in the printing machine, of which side ~rames are seen at 3 and 4 respectively. The roll 1 ' ` : . ':
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. .' - ~' ' , -" ~
-~ - 3 .
1~37~
has axles 5 and 6 which are journalled in side frame 3 and bearing block 7 borne on side frame 4. As will be explained in more detail the bearing block 7 is removable. Beyond the other of the journals is provided conventional drive gear 8 and an extension 9 of the axis 6.
The sleeve 2 is of a type which is removable from the roll 1 as is particularly valuable in flexographic printing. In particular, the roll 1 may have ends of different diameters, with a ..
corre~ponding difference on the inner surface of the sleeve and be provided with pneumatic rèmoval means ..
as has been described in the said co-pending patent appl.ication.
To remove the sleeve 2 while the roll; remains . in situ in.the p.rinting machine, the bearing block 7 is removed axially, a counterpoise for the mass of the ..
: . roll lk In a simple version, the counterpoise is a ` .
.~ .
~ ~ stop 10 in the form of a braclcet which is placed in : .
position on the side frame of -the machine and bears . downwardly on the axial extension 9. . . .
A stop 10 :i5 seen in dotted lines in Fig.2, for ~ . . .
example.
. - ~ In a preferred system, a counterpoise is provided . bv a hydraulic cylinder 12 piv~tally anchored to . or the machine rame/floor and acting through a pull rod .
.
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.
.. . . . . .. . . . . . . . . . .
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~L~71~:i6~3 13 and yoke 14, surrouncling -the ext.ension 9 of the roll axle and engaged to it by a removable end-cap 15. The end-cap normally remai.ns permanently engaged on the axle extension, and is rotatable within the yoke 14 in roller bearing 16.
; A pivot 17 links the rod 13 to the yoke 14. The rod 13 includes a turnbuckle 18 which is set so .
that, when pressure is applied within the c~linder 12 to drive the pis-ton 19 (coupled to the rod 13) downwardly to its fullest extent (see Fig.2), the roll 1 is maintained in substantially the same .
position as it.occupied when working~ but separated by a small distance ~rom both impres.sion and inking rol.lers, and with the driving gear 8 remaining in .:
partial engagement with the gear trai~ as is normal :
when a printing mach.ine of this type is stationary. .
rrhen, as seen in Figure 3, an air-line 11 is brought up to an air inlet provided in the end of the axial extension 9, air is passed to the hollow core of the roll 1 .
'' ." .
escaping by apertures provided in its surface, and .~.~-the sleeve 2 is slid axially off the roll over the axle 5 r~he removal of the bearing block 7 has allowed access to that end of the roll~ To fit a sleeve~ all that needs to be done is the bringing up . .
of a fresh stage o~ the pneumatic means as described in the said co~pendlng application, the returning : ' -'' , - "
.
. - 5 . . ' ` ' '' : ' :
. ~ . . . -.:
: :.: :.
7~36~3 of the bearing block 7 iIltO position and the machine is then ready to work. 0~ course, the present invention is equally applicable to any other sleeve-removal systems which require free access to one axial end of a roll core.
The removable bearing block is seen in more detail in Figures 5 and 6.
The side frame 3 terminates in a separate block 20 which incorporates a rolling contact bearing 21 which runs on the journal 5. The bearing is axially .
immovable in the blocX. The blocX 20 is screwed down onto the side frame 3 by long-stemmed bolts 22 engaging in threaded bores 22 in the side frame 3 and turnable by hand knobs 24. A spring 25 is compressed between the undersurface of nob 24 and an end of an enlar~ed housin~ 26 in the block 20.
For exact positioning oE the block 20 side walls of a platform 27 on the side frame 3-engage tightly with ' ' :' .
side walls of respective ridges 28,29 on the block.
;, ' - 20 Because the bearing block 20 must be axially slldable off the roll ~ournal 5, the bearing 21 ; has no axial retention capacity, its inner race sliding freely on the journal 5. Axlal re-tention capacity is~provided by an adjustable restrainer 30.
A rotatable shaft 31 is borne in a bore 32 in the bloc7~ 20 5in Fig.6 the restrainer 30 has been ~ .
.
removed). It is rotatable by hand knob 33 and is ~ ~
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axially immovable relative to block 20, being retained by a shoulder 3A and collar 35. It is : :
screw-threadedly engaged at 36 with a restrainer body 37. A locking screw 38 in the body 37 can be tightened onto the shaft 31 to prevent it ro-tating.
The body 37 has an apertured lug 39 which acts as a yoke receiving within its circular aperture 40 a rolling contact bearing 41 which is axially retained by circlip 42 and shoulder A3. An extreme end portion of the axla 5 is made up of an integral part 44 of a diameter to engage within the bearing 41 and of a separate screw part 45 which is screw-threadedly engaged with the shaft 5 by means of a screw-threaded post 46. of the part 4 In the running condition of lhe machine a shouldered washer 47 is clamped to the bearing 41 by screw part 4~. The axial position of the roll is - adjusted by rotation of hand screw 33 and is locked 20 . by locking screw 38.
: ~ . To remove the journal (the machine being stopped) - and after the counterpoise has been provided, -the~ -screw part A5 is unscrewed and shouldered washer 47 : removed. ~earing 41 is now free to be slid axially :.
.~ ~ oEf the shaft part 44 and now the whole bearing block .~
: :
~ 20 may be removed, once bolts 22 have been undone.
.
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.
... . . - . - .
:~ - : - . .: . . . : : .
Bearing 21 offers no impediment to this removal.
Ihe bearing 41 is housed in a rlanged bush ~
of which the bush part 48 has an outer diameter 49 eccentric of its inner bore diameter 50, the lat-ter being the diameter which receives the outèr race of bearing 21. The flange 51 of the bush ~ has an -.
arcuate slot 52 by which a bolt 53 can locX the bush ~ in a desired attitude, so that the .
eccentricity of the bush corrects for errors in printing plates or sleeves on the roll, in a manner known ~ se.
~ ~ .
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from the roll so as to leave that end of the roll axially accessible, counterpoising the mass of the roll by applylng downward pressure beyond the other o~ the journals to an axl~ extendin~
from the roll, removing a sleeve from the roll by axial movement over the said end of the roll, replacing the sleeve by a fresh sleeve and repositioning the first mentioned journal in the printing machine.
DESCRIPTION OF T~ DRAWINGS A~D OF A PREFERRED EMBODIME~T
~ particular embodiment of the invention and method of carrying it out will now be descrlbed with :
reference to the accompanying drawings wherein -Figs. 1,2 and 3 show in side elevation and partial`
section three successive stages in carrying out the method, ;
Fig.4 is a side view, on a larger scale~ of a counterpoising means, Fig.5 is a sectlon of a removable journal, and Fig.6 is a section~on the line VI-VI of Figure 5, -~
some parts being ur-ther cu~-away. `
~ ~ ~ Figure 1 shows diagrammatically the normal working ; ~ condition of a printing machine with a printing roll ~ 1 fitted with a demountable printing sleeve and in . .
position in the printing machine, of which side ~rames are seen at 3 and 4 respectively. The roll 1 ' ` : . ':
,:
. .' - ~' ' , -" ~
-~ - 3 .
1~37~
has axles 5 and 6 which are journalled in side frame 3 and bearing block 7 borne on side frame 4. As will be explained in more detail the bearing block 7 is removable. Beyond the other of the journals is provided conventional drive gear 8 and an extension 9 of the axis 6.
The sleeve 2 is of a type which is removable from the roll 1 as is particularly valuable in flexographic printing. In particular, the roll 1 may have ends of different diameters, with a ..
corre~ponding difference on the inner surface of the sleeve and be provided with pneumatic rèmoval means ..
as has been described in the said co-pending patent appl.ication.
To remove the sleeve 2 while the roll; remains . in situ in.the p.rinting machine, the bearing block 7 is removed axially, a counterpoise for the mass of the ..
: . roll lk In a simple version, the counterpoise is a ` .
.~ .
~ ~ stop 10 in the form of a braclcet which is placed in : .
position on the side frame of -the machine and bears . downwardly on the axial extension 9. . . .
A stop 10 :i5 seen in dotted lines in Fig.2, for ~ . . .
example.
. - ~ In a preferred system, a counterpoise is provided . bv a hydraulic cylinder 12 piv~tally anchored to . or the machine rame/floor and acting through a pull rod .
.
., ' .
: ~ .
.
.. . . . . .. . . . . . . . . . .
.. .... . . .
., . . : . . : : ~ ,.
~L~71~:i6~3 13 and yoke 14, surrouncling -the ext.ension 9 of the roll axle and engaged to it by a removable end-cap 15. The end-cap normally remai.ns permanently engaged on the axle extension, and is rotatable within the yoke 14 in roller bearing 16.
; A pivot 17 links the rod 13 to the yoke 14. The rod 13 includes a turnbuckle 18 which is set so .
that, when pressure is applied within the c~linder 12 to drive the pis-ton 19 (coupled to the rod 13) downwardly to its fullest extent (see Fig.2), the roll 1 is maintained in substantially the same .
position as it.occupied when working~ but separated by a small distance ~rom both impres.sion and inking rol.lers, and with the driving gear 8 remaining in .:
partial engagement with the gear trai~ as is normal :
when a printing mach.ine of this type is stationary. .
rrhen, as seen in Figure 3, an air-line 11 is brought up to an air inlet provided in the end of the axial extension 9, air is passed to the hollow core of the roll 1 .
'' ." .
escaping by apertures provided in its surface, and .~.~-the sleeve 2 is slid axially off the roll over the axle 5 r~he removal of the bearing block 7 has allowed access to that end of the roll~ To fit a sleeve~ all that needs to be done is the bringing up . .
of a fresh stage o~ the pneumatic means as described in the said co~pendlng application, the returning : ' -'' , - "
.
. - 5 . . ' ` ' '' : ' :
. ~ . . . -.:
: :.: :.
7~36~3 of the bearing block 7 iIltO position and the machine is then ready to work. 0~ course, the present invention is equally applicable to any other sleeve-removal systems which require free access to one axial end of a roll core.
The removable bearing block is seen in more detail in Figures 5 and 6.
The side frame 3 terminates in a separate block 20 which incorporates a rolling contact bearing 21 which runs on the journal 5. The bearing is axially .
immovable in the blocX. The blocX 20 is screwed down onto the side frame 3 by long-stemmed bolts 22 engaging in threaded bores 22 in the side frame 3 and turnable by hand knobs 24. A spring 25 is compressed between the undersurface of nob 24 and an end of an enlar~ed housin~ 26 in the block 20.
For exact positioning oE the block 20 side walls of a platform 27 on the side frame 3-engage tightly with ' ' :' .
side walls of respective ridges 28,29 on the block.
;, ' - 20 Because the bearing block 20 must be axially slldable off the roll ~ournal 5, the bearing 21 ; has no axial retention capacity, its inner race sliding freely on the journal 5. Axlal re-tention capacity is~provided by an adjustable restrainer 30.
A rotatable shaft 31 is borne in a bore 32 in the bloc7~ 20 5in Fig.6 the restrainer 30 has been ~ .
.
removed). It is rotatable by hand knob 33 and is ~ ~
, ~
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~:
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~7~661~
axially immovable relative to block 20, being retained by a shoulder 3A and collar 35. It is : :
screw-threadedly engaged at 36 with a restrainer body 37. A locking screw 38 in the body 37 can be tightened onto the shaft 31 to prevent it ro-tating.
The body 37 has an apertured lug 39 which acts as a yoke receiving within its circular aperture 40 a rolling contact bearing 41 which is axially retained by circlip 42 and shoulder A3. An extreme end portion of the axla 5 is made up of an integral part 44 of a diameter to engage within the bearing 41 and of a separate screw part 45 which is screw-threadedly engaged with the shaft 5 by means of a screw-threaded post 46. of the part 4 In the running condition of lhe machine a shouldered washer 47 is clamped to the bearing 41 by screw part 4~. The axial position of the roll is - adjusted by rotation of hand screw 33 and is locked 20 . by locking screw 38.
: ~ . To remove the journal (the machine being stopped) - and after the counterpoise has been provided, -the~ -screw part A5 is unscrewed and shouldered washer 47 : removed. ~earing 41 is now free to be slid axially :.
.~ ~ oEf the shaft part 44 and now the whole bearing block .~
: :
~ 20 may be removed, once bolts 22 have been undone.
.
.~'. .:
. : , ....... . ...... , . . :.: . .. .. ..
.
... . . - . - .
:~ - : - . .: . . . : : .
Bearing 21 offers no impediment to this removal.
Ihe bearing 41 is housed in a rlanged bush ~
of which the bush part 48 has an outer diameter 49 eccentric of its inner bore diameter 50, the lat-ter being the diameter which receives the outèr race of bearing 21. The flange 51 of the bush ~ has an -.
arcuate slot 52 by which a bolt 53 can locX the bush ~ in a desired attitude, so that the .
eccentricity of the bush corrects for errors in printing plates or sleeves on the roll, in a manner known ~ se.
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Claims (12)
1. In a printing machine having at least one printing roll with a removable sleeve which provides its printing surface, the roll being journalled in side frames of the machine one beyond each axial end of the roll by bearings in the respective side frames, the improvement comprising means for removing the bearing in one of those frames from that side frame and from the roll so as to allow for sleeve-changing operations to be carried out upon the roll from that axial end, and means beyond the other side frame for counterpoising the roll and maintaining it in substantially a working position when the removable bearing has been removed.
2. A printing machine having at least one printing roll with a removable sleeve, the roll having an axis and being journalled in side frames of the machine one beyond each axial end of the roll by bearings in the respective side frames, means permitting removal of the bearing in one of those frames from the side frame and from the roll axle in an axial direction and means beyond the other side frame for counterpoising the roll when the removable bearing has been removed whereby to maintain the roll substantially in its working position.
3. A printing machine according to Claim 2 wherein the one bearing is borne in a block removably secured on the one side frame, and means removably connecting a restrainer to the roll axle to interact with it to determine axial positioning of the axle relative to the side frame.
4. A printing machine according to Claim 3 wherein the restrainer comprises a screw threadedly engaged rod and body, the rod extending parallel to the roll axle and being rotatable to alter the axial position of the body and a bearing having axial resistance coupling the body to the axle.
5. A printing machine according to Claim 4 wherein the bearing is secured to the axle by entrapment of an inner race thereof between a shoulder on the axle and an end cap removably secured to the end of the axle.
6. A printing machine according to Claim 3 wherein the block is securable to the side frame by hand-rotatable bolts lying in a common vertical plane normal to the axis of the axle and being on respective side of the axle, and means interengaging between the block and the side frame for determining the position of the block on that frame.
7. A printing machine according to Claim 2 wherein the counterpoise means is a bracket positionable to abut the end portion of the axle beyond the other side frame.
8. A printing machine according to Claim 2 wherein the counterpoise means is pull-rod, coupled to the end portion of the axle beyond the other side frame through a yoke and a rolling-contact bearing and actuable in a downward direction by an anchored piston and cylinder arrangement.
9. A printing machine according to Claim 8 wherein the pull-rod includes means for adjusting its length, the said means being set such that the desired maintenance in position is achieved when the piston in the piston and cylinder arrangement has reached the end of its stroke.
10. A printing machine according to Claim 2 wherein the removable journal includes an eccentric bush between the side frame and the axle of the roll.
11. A method of changing a sleeve upon a printing roll which is borne in respective journals in respective side frames of a printing machine which consists of removing one only of the journals from the roll so as to leave that end of the roll axially accessible, counterpoising the weight of the roll by applying downward pressure beyond the other of the journals to an axle extending from the roll to maintain the roll substantially in its working position, removing a sleeve from the roll by axial movement over the said end of the roll, replacing the sleeve by a fresh sleeve and repositioning the first mentioned journal in the printing machine.
12. A method according to Claim 11 wherein the counterpoising is effected by a downwards pull on the axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA282,286A CA1078668A (en) | 1977-07-07 | 1977-07-07 | Printing press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA282,286A CA1078668A (en) | 1977-07-07 | 1977-07-07 | Printing press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1078668A true CA1078668A (en) | 1980-06-03 |
Family
ID=4109091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,286A Expired CA1078668A (en) | 1977-07-07 | 1977-07-07 | Printing press |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1078668A (en) |
-
1977
- 1977-07-07 CA CA282,286A patent/CA1078668A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |