CA2038809C - Narrow gap plate mounting apparatus and method - Google Patents
Narrow gap plate mounting apparatus and methodInfo
- Publication number
- CA2038809C CA2038809C CA 2038809 CA2038809A CA2038809C CA 2038809 C CA2038809 C CA 2038809C CA 2038809 CA2038809 CA 2038809 CA 2038809 A CA2038809 A CA 2038809A CA 2038809 C CA2038809 C CA 2038809C
- Authority
- CA
- Canada
- Prior art keywords
- curved
- tail
- gap
- cylinder
- wall
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1281—Devices for attaching printing elements or formes to supports for attaching flexible printing formes details of the printing plate ends
Abstract
A narrow gap printing plate mounting apparatus includes a printing plate (10) with a substantially curved, preferably involute tail member (24) at one end of a printing plate body (12) which is received through a narrow mating gap (20) in a rotary cylinder (18) and held against correspondingly curved cavity wall (28) by means of a resilient locking member (30).
The locking member (30) presses the curved tail member (24) against the curved wall (28) in a direction which is substantially normal thereto to reduce longitudinal strain on the tall member (24). Another tail member (22) is inserted at the leading edge (20A) of the gap (20) while the curved tail member (24) presses against the lagging edge (20B) of the slot (24).
When removing the plate from the cylinder (18), the curved tail member (24) at the lagging edge (20B) is removed first.
The locking member (30) presses the curved tail member (24) against the curved wall (28) in a direction which is substantially normal thereto to reduce longitudinal strain on the tall member (24). Another tail member (22) is inserted at the leading edge (20A) of the gap (20) while the curved tail member (24) presses against the lagging edge (20B) of the slot (24).
When removing the plate from the cylinder (18), the curved tail member (24) at the lagging edge (20B) is removed first.
Description
;
Backy~ound of the ~en~ion Thi~ inventlon relate~ to a print~ng plate mounting apparatus Por releas~bly connecting a printing plate to a rotary cylinder of a printing press and, more particularly, to such a mountlng apparatus in which the plate i~ mounted by means of tail members at opposite ends which are held wlthin a longitudinal mounting gap in the ~urface of the cylinder.
It is well known to mount a prlnting plate to a rotary cylin~er of a printing pres~ by means of ~ail members at opposite ends of tbe planar, flexible body of a printing plate which are releasibly held within a cavity beneath an elongate, longitudinal, mounting slot, or gap, in the ~urface o~ the cyllnder.
The platey or plate body, and the tail members, which are integrally formed ~herewith ~rom rolled ~teel or other suitable material, have a ~hickness o~ approximately ei~h~ to twelve mils.
~ With known prlnting plate~ o~ this type, ~he ~mallest gaps which san be used are a~ least ten times ~he thickness of the plates. Speci~ically, the ~mallest gap known to operate ~uccessfully i~ approximately 123 mils t~ick.
The gaps in the ~urface of a rotaEy cylinder tend to imbalance the cylinder which c~ufie~ vibrations that can cause streaking at higher pres~ speed~. It ~s well known ~ha~ the larger the gap, the grea'cer the v$bratic~n and the greater resultant streaking problem. Accordingly, many efforts have been made to reduce the gap to a smaller dimen~ion than ha~ so ~ar-been pos~ible or to elimina~e the gap entirely.
In known printing plate ~ounting assemblies, the tail members are both ~ubstantially planar and extend at acute angles to overlie the printing plate body. The tail at the leading edge i~ inserted in the gap and hooks around an edge. The flexible body i8 ~hen wrapped around the oylinder until the tail at ~he opposite end of ~he bo~y i8 located opposite the gap. It is then .
: ' ~ 2 ~
in~erted ~n the gap alongside the leading edge tail member and locked in place.
With known printing plates, the gaps are ~o large, the locking mechani~m often must longi~udinally ~train ~h~ tail member to keep it in place which can cause distortion of the tail member. This distor~ion i8 pre~erably avo~ded since it can cause jamming of the tail member within the ~lo~ and hinder or prevent ubsequent removal even ~hen the gap ~8 relatiYely large.
Even witbou~ distortion, attemptg to reduce the gap to less than a minimum gap ~ize of approximatley 123 mils results in difficultie~ in in~ertin~ the one tail member ln the gap after the other tail has already been ingerted. Moreover, small gap sizes can create unacceptable di~ficulties in removing the tail members a~ter inser~ion with known printing plates.
~ ~ry of t~e InYe~tion It ~ therefore an object of the pre~ent in~ention to provide a printing plate mo~nting apparatus which enables a substantial ~eduction in the minimum size o~ the mounting gap compared to known mounting apparatus and in whicb locking mechanlsm that strain the printing plate can be avoided.
It ~s also an objective to provide a printing plate ~pparatu~ tha~ employs a tail locklng mechaniRm which ~unctions to hold the tall with$n the gap withou~ straining the tail member or the printing plate body to whlch it i8 attached.
Both of the~e ba~ic objectives are achieved ln part through provision of a printing plate having a planar body extending between a pair of oppo~ite end~ for mounting to the surface of a rotary cylinder of a printing press by means o~ a mounting yap for holding the body to the cylinder at said oppo~ite ends with a narrow gap plate mounting apparatus, The narrow gap plate mounting apparatus compri ing a flr~t tail member at one of said opposite ends and extending away from the planar body for receipt within the mounting gap, and a ~econd tail member at the other one o~
~aid oppo~ite end~ and extending away from the planar body for ~ 3 :' receipt within the mounting gap together with the ~ub~tantially planar tail member, which unlike known planar tall m~mber~, is substantially curved.
Preferably, the curved shape ~s at least approxlmately involu~e, i.e. khe locus of a fixed point on a taut, lnextensible 6triny as it unwinds from a fixed plane curve. In the preferred embodiment, the substantially curved tail member includes a plural~ty of substan~ially planar tail member 6egments interconnected to approximate the curved ~hape of the substanti~lly curved tail member.
The objectives are also achieYed, in part, through provision of a narrow gap mounting apparatu6 ~ncluding a cavity wlthin a printing pre6Q cylinder and in communication with the gap which has a ~ub~tant~ally curved wall to mats with the sub~tantially curved one of the tail members recelved through the mounting slot and means for pressing the curved one of tbe tails against the curved wall to hold it within the cavity.
An improved method of mounting a printing plate to a cylinder of a rotary printing press is then also provided which enables use of B much narrower gap than previously could be used compr~ing the 8tep8 0~ bending the oppo~l~e ends of printing plate gtock to ~orm a pair of firs~ and second mounting tail member~ at oppo~ite ends of an intermediate plana~ body with the second ~ail member being bent in a curved shape inserting the ~ir~t ta~l member in a mounting slot ~n ~he cyl~nder conveying the intermed~ate body around the cyl~nder and ln~ert~ng the ~econd, curved tail member into the 810t between a lagging edge of the ~lot and the ~irBt tail member. In the preferred embodiment, the second tail member ~8 ben~ in an approxima~e lnvoIute shape.
Achieving the ~econd objective of the ~nvention, a narrow gap plate mating apparatus for a cylinder i5 also provided which reduces strain on the tail member compr~sing a cavlty within the ~ylinder and havlng a pair of walls extending from the gap which are con~ormed relative to the pair ~ tails to receive them in mating, overlying relationship when fully inserted ~n ~he gap, a "\
~Q3~
locking mechani6m within the cavity including a locking member and mean~ ~or moving the locking member to pres~ one of the tail members against it~ mating wall in a direction substantially transver~e thereto to ~r$ctionally hold it within the ~aYity.
~ri~f D~3cription o~ tbe Drawi~gs The foreyoing object~, advantages and features of the invention will be described in greater detail and f~rther objects, advantages and features will be made apparent ~rom the detailed description of the preferred embodiment which i~ given with reference to the several figures o~ the drawing, in which:
Fi~ s a eectional 6~de view o~ a printing plate assembly with the narrow gap plate mounting apparatus of the present invention;
Fig. 2 i6 a schmatic ~ec~ional end view of a printing plate cyl~nder wi~h the preferred embodimen~ of the narrow gap plate mounting appar~tus of the invention a~sociated therewith and ~hown as mounting the pr inting plate of Fig. l;
~ ig. 3 i~ a perspective view o~ the pre~erred ~orm of the locking mechani6m of Fig. 2 partially removed from lt~ associated cylinder to better illu~tra~ce the detail~ thereof; and Fig. 4 i6 a C~088 sectional end view through the cyllnder and locking meahanism o~ Pig. 3 wlth the locking mechanism fully installed and in the unlocked po~ition.
Det~iled ~e~cription Referring now to Figs. 1 and 2, a preferred embodiment o~ a printing plate 10 incorporating the narrow gap plate mounting apparatu~ i8 ~een to have a planar body 12 extending between a pair of opposite ends 14 and 16. The planar body 12 i~ made of flexible, rolled ~teel or the like havirlg a 'chickne~s of approx~mately eight to twelve mils. The length of the plate 10 between ends 14 and 16 1~ matched to the circumferenoe of the plate cylinder 18 whlch in thl~ partlcular emboaiment i~
.: ~r~3~
approximately twenty-one inches. ~he len~th is also matched to that of the cylinder 18 which may vary from approximately two to five feet. The planar, re6illent body 12 of the plate 10 ls mounted by wrapping the body around the ~urface of the cylinder 18. ~f~er being wrapped, the body ~s held to the cyllnder lS at the opposite ends by means including the narrow gap mounting apparatus including a ~irst tail member 22 and a second, ~ubstantially curved tail member 24.
The first tail member 22 15 of planar configuration and extends away from and over the planar body 12 to ~orm an acute angle therewith o~ approximately ~orty-~our degrees. The length of the flrst tail member 22 i~ 0.362 inches, and i8 ~oi~ed at the end 1~ by a bend having a radius o~ 0 015 inches.
The ~econd, curved tail member 24 at tbe other opposite 16 al80 extends away from and over the plsnar body 12 for receip~
within the mounting gap, or slot, 20 together with the substantially planar tail member 22. In keeping with the present invention, the objectives are achieved by providing the second tail member with a ~ubstantially curved conflguration~
Preferably, the substantially curved tail 24 ha~ a curved shape which ~s at least approximately involute.
Because o~ difficulties in manufacture, the substantially curved ~hape i~ achieved by providing a plurality o~
sub~tantially planar ~ail member segment~ 2~A, 24B an~ 24C which are interconnected ~o approximate the ~ubstant~ally curved shape of the second tail member 24. ~n the preferred embodlment ~hown ~n Fig. 1, the three planar tail member segments 24A, 24B and 24C
are interconnected to approxim~te an involute shape. In the partlcular printing plate shown in Fig. 1, the lengths of segments 24~, 248 and 24C a~e 0.068 inches, 0.393 inches and 0.318 inche~, respectively. The segment 24A forms a right angle with the bod~ 12 and has a bend radius o~ 0.010. The middle s~gment 24B forms an angle of eighty-seven degree~ and the distal segment 24C forms an angle o~ approximately seventy degrees relative to the pl~nar body 12. The maximum bend radius ~or the bends at the beginning of 6egments 24B and 2~C is 0.030 inches.
' . , ... ~
'~ ~ 3 ~
.
While this ~peciP$c conf$guration and dlmennlons for approximating a ~ubstantially curved ~hape for tall 24 ha~ worked succe~s~ully, it ~hould be appreciated that variation~ may be made while ~till retaining the advantages of the invention.
Still referring to Fig. 2, the a~pect of the plate mounting apparatus a~sociated with the cylinder 18 ~ 8 Reen to include a cavity 26 within the cyl~nder 18 and in communication with the gap 20 which ha~ a substantially curved wall 28. The curve of wall 28 i~ ~elected to congruently mate ~ith the ~ubstantially curved tail member ~4. The ~ubstantially curved wall 28, con~orming to the ~ub~tant1ally curved tail member 24 of Fig. 1, has three planar ~egments ~8A, 288 and 28C for re~pectively mating with the curved ta$1 member segment~ 24A, 24B and 24C to approximate an involute curve. In any event, the ~ubstantially curved tail member 24 snugly fits against the substantially curved wall 28 when the tail member 24 i~ fully inserted thro~gh the gap 20.
Once in place, as ~hown in Fig. 2, a curved, re~ilient locking member 30 of a rotatable locking mechanism iB pressed against the ~ubstantially curved tail member 24 at its distal egment 24C to cause it to resiliently pre ~ against the curved wall 28 to frictionally hold it w~thin cavity 26. The locking mechanism ~nclude~ a lock rotor 32 mounted for rotation within the cavity ~bou~ an axi~ paralle~ to tha~ of the cylinder 2e and defined by a cylindr:ical wall 26A o~ the cavity 26. When rotated in the direc'cion of arrow 33 ~rom the locked position shown in Fig. 2 to an unlocked po6ition, the resi1ient locklng member 30 is disengaged from the curved wall 28.
~ he resil~ent locking member 30 i~ releasably attached to the rotor 32 by means of a plurality of screws 35 which are iastened to the underside o~ a channel 36 prov$ded for ~hat purpose. Oppo~ite he channel, the rotor 32 ha~ a cylindrical : wall portion 32A which iB rotatably suppor~ed withln a ma~chin~
cylindrical wall portion 26A of the cavity 26.
: ~he curved cavity wall 26A ~oins with a planar wall 34 wh$ch end~ at the leading edge 20A o~ the gap 20 and ~onforms to the . . ~ . . .
.
~ f~
fir8t planar ta~l member 22. Planar wall 34 i~ formed in the ~ide of an ~nsert 38 fitted into ~n irregularly ~haped groove 40 ln the cylinder 18, while the planar ~all ~egments 28A, 2~ and 2BC are defined by the walls of the slot 40 itself.
Referring to ~i~. 3, the lock rotor 32 is ~een to be slideably removable ~rom the ca~ity 2~ at one end of cylinder 18 and is locked adjacent an adjustment ~crew 42.
Referring now to Fi~. 4, viewing a 6ection norm~l to the axis of the cylinder in fzont of an a~jUstment ~crew 42 o~ Fi~.
3, a worm gear 44 is connected to the loc~ rotor 32 and engages a threaded section 42A of the ad~u~tment BCreW 4~. Accor~ingly, when the adjustment screw 42 is rota~ed in one direction, the worm gear 44 andl thus, the lock rotor 32 and resilient locking ~rm are rotated in one direction to the unlocked position shown in Fig. 2~ When the ad~acent screw 42 i8 rotated in the other direction, the worm gear 44 causes the lock rotor 32 to move to the unlocked position shown in Fig. 4.
The printing pla~e body 12 i~ mounted to the cylinder 18 by first fully inserting tbe planar tail me~ber 22 into the gap and then wrapping th-~ body 12 around the cylinder 18 in the direction of its normal rotat~on. After the planar body has been wrapped all the way around the cylinder 18, the ~urved tail member is fully in~erted through the gap 20 between ~he lagging edge 20B of gap 30 ~nd the first, planar ~ail member 22. The narrow gap I eliminates the need for a locking mechanl~m wh~ch ~tr~ins She tail member by pulling on it. Accordingly, the locking member 30 which o~ly presses aga~nst the tail member 24 in a normal direction is employed to hold the curved fir~t member 24 against ~he wall 28 after they are aligned.
While a particular embodiment has beèn described in detail, i~ ~hould be appreciated that many var~at$ons may be made thereto without departing from the 8cope of the invention as defined in the appended claims.
Backy~ound of the ~en~ion Thi~ inventlon relate~ to a print~ng plate mounting apparatus Por releas~bly connecting a printing plate to a rotary cylinder of a printing press and, more particularly, to such a mountlng apparatus in which the plate i~ mounted by means of tail members at opposite ends which are held wlthin a longitudinal mounting gap in the ~urface of the cylinder.
It is well known to mount a prlnting plate to a rotary cylin~er of a printing pres~ by means of ~ail members at opposite ends of tbe planar, flexible body of a printing plate which are releasibly held within a cavity beneath an elongate, longitudinal, mounting slot, or gap, in the ~urface o~ the cyllnder.
The platey or plate body, and the tail members, which are integrally formed ~herewith ~rom rolled ~teel or other suitable material, have a ~hickness o~ approximately ei~h~ to twelve mils.
~ With known prlnting plate~ o~ this type, ~he ~mallest gaps which san be used are a~ least ten times ~he thickness of the plates. Speci~ically, the ~mallest gap known to operate ~uccessfully i~ approximately 123 mils t~ick.
The gaps in the ~urface of a rotaEy cylinder tend to imbalance the cylinder which c~ufie~ vibrations that can cause streaking at higher pres~ speed~. It ~s well known ~ha~ the larger the gap, the grea'cer the v$bratic~n and the greater resultant streaking problem. Accordingly, many efforts have been made to reduce the gap to a smaller dimen~ion than ha~ so ~ar-been pos~ible or to elimina~e the gap entirely.
In known printing plate ~ounting assemblies, the tail members are both ~ubstantially planar and extend at acute angles to overlie the printing plate body. The tail at the leading edge i~ inserted in the gap and hooks around an edge. The flexible body i8 ~hen wrapped around the oylinder until the tail at ~he opposite end of ~he bo~y i8 located opposite the gap. It is then .
: ' ~ 2 ~
in~erted ~n the gap alongside the leading edge tail member and locked in place.
With known printing plates, the gaps are ~o large, the locking mechani~m often must longi~udinally ~train ~h~ tail member to keep it in place which can cause distortion of the tail member. This distor~ion i8 pre~erably avo~ded since it can cause jamming of the tail member within the ~lo~ and hinder or prevent ubsequent removal even ~hen the gap ~8 relatiYely large.
Even witbou~ distortion, attemptg to reduce the gap to less than a minimum gap ~ize of approximatley 123 mils results in difficultie~ in in~ertin~ the one tail member ln the gap after the other tail has already been ingerted. Moreover, small gap sizes can create unacceptable di~ficulties in removing the tail members a~ter inser~ion with known printing plates.
~ ~ry of t~e InYe~tion It ~ therefore an object of the pre~ent in~ention to provide a printing plate mo~nting apparatus which enables a substantial ~eduction in the minimum size o~ the mounting gap compared to known mounting apparatus and in whicb locking mechanlsm that strain the printing plate can be avoided.
It ~s also an objective to provide a printing plate ~pparatu~ tha~ employs a tail locklng mechaniRm which ~unctions to hold the tall with$n the gap withou~ straining the tail member or the printing plate body to whlch it i8 attached.
Both of the~e ba~ic objectives are achieved ln part through provision of a printing plate having a planar body extending between a pair of oppo~ite end~ for mounting to the surface of a rotary cylinder of a printing press by means o~ a mounting yap for holding the body to the cylinder at said oppo~ite ends with a narrow gap plate mounting apparatus, The narrow gap plate mounting apparatus compri ing a flr~t tail member at one of said opposite ends and extending away from the planar body for receipt within the mounting gap, and a ~econd tail member at the other one o~
~aid oppo~ite end~ and extending away from the planar body for ~ 3 :' receipt within the mounting gap together with the ~ub~tantially planar tail member, which unlike known planar tall m~mber~, is substantially curved.
Preferably, the curved shape ~s at least approxlmately involu~e, i.e. khe locus of a fixed point on a taut, lnextensible 6triny as it unwinds from a fixed plane curve. In the preferred embodiment, the substantially curved tail member includes a plural~ty of substan~ially planar tail member 6egments interconnected to approximate the curved ~hape of the substanti~lly curved tail member.
The objectives are also achieYed, in part, through provision of a narrow gap mounting apparatu6 ~ncluding a cavity wlthin a printing pre6Q cylinder and in communication with the gap which has a ~ub~tant~ally curved wall to mats with the sub~tantially curved one of the tail members recelved through the mounting slot and means for pressing the curved one of tbe tails against the curved wall to hold it within the cavity.
An improved method of mounting a printing plate to a cylinder of a rotary printing press is then also provided which enables use of B much narrower gap than previously could be used compr~ing the 8tep8 0~ bending the oppo~l~e ends of printing plate gtock to ~orm a pair of firs~ and second mounting tail member~ at oppo~ite ends of an intermediate plana~ body with the second ~ail member being bent in a curved shape inserting the ~ir~t ta~l member in a mounting slot ~n ~he cyl~nder conveying the intermed~ate body around the cyl~nder and ln~ert~ng the ~econd, curved tail member into the 810t between a lagging edge of the ~lot and the ~irBt tail member. In the preferred embodiment, the second tail member ~8 ben~ in an approxima~e lnvoIute shape.
Achieving the ~econd objective of the ~nvention, a narrow gap plate mating apparatus for a cylinder i5 also provided which reduces strain on the tail member compr~sing a cavlty within the ~ylinder and havlng a pair of walls extending from the gap which are con~ormed relative to the pair ~ tails to receive them in mating, overlying relationship when fully inserted ~n ~he gap, a "\
~Q3~
locking mechani6m within the cavity including a locking member and mean~ ~or moving the locking member to pres~ one of the tail members against it~ mating wall in a direction substantially transver~e thereto to ~r$ctionally hold it within the ~aYity.
~ri~f D~3cription o~ tbe Drawi~gs The foreyoing object~, advantages and features of the invention will be described in greater detail and f~rther objects, advantages and features will be made apparent ~rom the detailed description of the preferred embodiment which i~ given with reference to the several figures o~ the drawing, in which:
Fi~ s a eectional 6~de view o~ a printing plate assembly with the narrow gap plate mounting apparatus of the present invention;
Fig. 2 i6 a schmatic ~ec~ional end view of a printing plate cyl~nder wi~h the preferred embodimen~ of the narrow gap plate mounting appar~tus of the invention a~sociated therewith and ~hown as mounting the pr inting plate of Fig. l;
~ ig. 3 i~ a perspective view o~ the pre~erred ~orm of the locking mechani6m of Fig. 2 partially removed from lt~ associated cylinder to better illu~tra~ce the detail~ thereof; and Fig. 4 i6 a C~088 sectional end view through the cyllnder and locking meahanism o~ Pig. 3 wlth the locking mechanism fully installed and in the unlocked po~ition.
Det~iled ~e~cription Referring now to Figs. 1 and 2, a preferred embodiment o~ a printing plate 10 incorporating the narrow gap plate mounting apparatu~ i8 ~een to have a planar body 12 extending between a pair of opposite ends 14 and 16. The planar body 12 i~ made of flexible, rolled ~teel or the like havirlg a 'chickne~s of approx~mately eight to twelve mils. The length of the plate 10 between ends 14 and 16 1~ matched to the circumferenoe of the plate cylinder 18 whlch in thl~ partlcular emboaiment i~
.: ~r~3~
approximately twenty-one inches. ~he len~th is also matched to that of the cylinder 18 which may vary from approximately two to five feet. The planar, re6illent body 12 of the plate 10 ls mounted by wrapping the body around the ~urface of the cylinder 18. ~f~er being wrapped, the body ~s held to the cyllnder lS at the opposite ends by means including the narrow gap mounting apparatus including a ~irst tail member 22 and a second, ~ubstantially curved tail member 24.
The first tail member 22 15 of planar configuration and extends away from and over the planar body 12 to ~orm an acute angle therewith o~ approximately ~orty-~our degrees. The length of the flrst tail member 22 i~ 0.362 inches, and i8 ~oi~ed at the end 1~ by a bend having a radius o~ 0 015 inches.
The ~econd, curved tail member 24 at tbe other opposite 16 al80 extends away from and over the plsnar body 12 for receip~
within the mounting gap, or slot, 20 together with the substantially planar tail member 22. In keeping with the present invention, the objectives are achieved by providing the second tail member with a ~ubstantially curved conflguration~
Preferably, the substantially curved tail 24 ha~ a curved shape which ~s at least approximately involute.
Because o~ difficulties in manufacture, the substantially curved ~hape i~ achieved by providing a plurality o~
sub~tantially planar ~ail member segment~ 2~A, 24B an~ 24C which are interconnected ~o approximate the ~ubstant~ally curved shape of the second tail member 24. ~n the preferred embodlment ~hown ~n Fig. 1, the three planar tail member segments 24A, 24B and 24C
are interconnected to approxim~te an involute shape. In the partlcular printing plate shown in Fig. 1, the lengths of segments 24~, 248 and 24C a~e 0.068 inches, 0.393 inches and 0.318 inche~, respectively. The segment 24A forms a right angle with the bod~ 12 and has a bend radius o~ 0.010. The middle s~gment 24B forms an angle of eighty-seven degree~ and the distal segment 24C forms an angle o~ approximately seventy degrees relative to the pl~nar body 12. The maximum bend radius ~or the bends at the beginning of 6egments 24B and 2~C is 0.030 inches.
' . , ... ~
'~ ~ 3 ~
.
While this ~peciP$c conf$guration and dlmennlons for approximating a ~ubstantially curved ~hape for tall 24 ha~ worked succe~s~ully, it ~hould be appreciated that variation~ may be made while ~till retaining the advantages of the invention.
Still referring to Fig. 2, the a~pect of the plate mounting apparatus a~sociated with the cylinder 18 ~ 8 Reen to include a cavity 26 within the cyl~nder 18 and in communication with the gap 20 which ha~ a substantially curved wall 28. The curve of wall 28 i~ ~elected to congruently mate ~ith the ~ubstantially curved tail member ~4. The ~ubstantially curved wall 28, con~orming to the ~ub~tant1ally curved tail member 24 of Fig. 1, has three planar ~egments ~8A, 288 and 28C for re~pectively mating with the curved ta$1 member segment~ 24A, 24B and 24C to approximate an involute curve. In any event, the ~ubstantially curved tail member 24 snugly fits against the substantially curved wall 28 when the tail member 24 i~ fully inserted thro~gh the gap 20.
Once in place, as ~hown in Fig. 2, a curved, re~ilient locking member 30 of a rotatable locking mechanism iB pressed against the ~ubstantially curved tail member 24 at its distal egment 24C to cause it to resiliently pre ~ against the curved wall 28 to frictionally hold it w~thin cavity 26. The locking mechanism ~nclude~ a lock rotor 32 mounted for rotation within the cavity ~bou~ an axi~ paralle~ to tha~ of the cylinder 2e and defined by a cylindr:ical wall 26A o~ the cavity 26. When rotated in the direc'cion of arrow 33 ~rom the locked position shown in Fig. 2 to an unlocked po6ition, the resi1ient locklng member 30 is disengaged from the curved wall 28.
~ he resil~ent locking member 30 i~ releasably attached to the rotor 32 by means of a plurality of screws 35 which are iastened to the underside o~ a channel 36 prov$ded for ~hat purpose. Oppo~ite he channel, the rotor 32 ha~ a cylindrical : wall portion 32A which iB rotatably suppor~ed withln a ma~chin~
cylindrical wall portion 26A of the cavity 26.
: ~he curved cavity wall 26A ~oins with a planar wall 34 wh$ch end~ at the leading edge 20A o~ the gap 20 and ~onforms to the . . ~ . . .
.
~ f~
fir8t planar ta~l member 22. Planar wall 34 i~ formed in the ~ide of an ~nsert 38 fitted into ~n irregularly ~haped groove 40 ln the cylinder 18, while the planar ~all ~egments 28A, 2~ and 2BC are defined by the walls of the slot 40 itself.
Referring to ~i~. 3, the lock rotor 32 is ~een to be slideably removable ~rom the ca~ity 2~ at one end of cylinder 18 and is locked adjacent an adjustment ~crew 42.
Referring now to Fi~. 4, viewing a 6ection norm~l to the axis of the cylinder in fzont of an a~jUstment ~crew 42 o~ Fi~.
3, a worm gear 44 is connected to the loc~ rotor 32 and engages a threaded section 42A of the ad~u~tment BCreW 4~. Accor~ingly, when the adjustment screw 42 is rota~ed in one direction, the worm gear 44 andl thus, the lock rotor 32 and resilient locking ~rm are rotated in one direction to the unlocked position shown in Fig. 2~ When the ad~acent screw 42 i8 rotated in the other direction, the worm gear 44 causes the lock rotor 32 to move to the unlocked position shown in Fig. 4.
The printing pla~e body 12 i~ mounted to the cylinder 18 by first fully inserting tbe planar tail me~ber 22 into the gap and then wrapping th-~ body 12 around the cylinder 18 in the direction of its normal rotat~on. After the planar body has been wrapped all the way around the cylinder 18, the ~urved tail member is fully in~erted through the gap 20 between ~he lagging edge 20B of gap 30 ~nd the first, planar ~ail member 22. The narrow gap I eliminates the need for a locking mechanl~m wh~ch ~tr~ins She tail member by pulling on it. Accordingly, the locking member 30 which o~ly presses aga~nst the tail member 24 in a normal direction is employed to hold the curved fir~t member 24 against ~he wall 28 after they are aligned.
While a particular embodiment has beèn described in detail, i~ ~hould be appreciated that many var~at$ons may be made thereto without departing from the 8cope of the invention as defined in the appended claims.
Claims (31)
1. In a printing plate having a planar body extending entirely between a pair of opposite ends for mounting to the surface of a rotary cylinder of a printing press, said cylinder having a mounting gap for holding the body to the cylinder at said opposite ends, the improvement being a narrow gap plate mounting apparatus, comprising:
a first tail member at one of said opposite ends and extending away from the planar body for receipt within the mounting gap; and a second, substantially curved tail member at the other one of said opposite ends and extending away from the planar body for receipt within the mounting slot together with the first tail member, said substantially curved tail member having an approximately involute shape.
a first tail member at one of said opposite ends and extending away from the planar body for receipt within the mounting gap; and a second, substantially curved tail member at the other one of said opposite ends and extending away from the planar body for receipt within the mounting slot together with the first tail member, said substantially curved tail member having an approximately involute shape.
2. The printing plate of claim 1 in which the curved tail member includes a plurality of substantially planar tail member segments interconnected to approximate the curved shape of the curved tail member.
3. The printing plate of claim 1 in which the first tail member is substantially non-curved.
4. The printing plate of claim 1 in which the second substantially curved tail member includes a plurality of segments interconnected to approximate an involute shape.
5. The printing plate of claim 4 in which at least some of said segments are substantially non-curved and planar.
6. In a cylinder of a rotary printing press having a gap in its cylindrical surface for mounting receipt of a pair of tail members at opposite ends of a flexible body of a plate wrapped around the cylinder, the improvement being a narrow gap mounting apparatus for holding the tail members within the mounting gap, comprising:
a cavity within the cylinder and in communication with the gap with a fixed wall extending inwardly from one edge of the gap which is inwardly curved backwardly underneath the cylindrical surface adjacent the one edge to mate with a substantially curved one of the tail members received through the mounting slot; and means for pressing the curved one of the tail members against the curved wall to frictionally hold it within the cavity.
a cavity within the cylinder and in communication with the gap with a fixed wall extending inwardly from one edge of the gap which is inwardly curved backwardly underneath the cylindrical surface adjacent the one edge to mate with a substantially curved one of the tail members received through the mounting slot; and means for pressing the curved one of the tail members against the curved wall to frictionally hold it within the cavity.
7. The printing press cylinder of claim 6 in which said cavity has a second wall opposite the curved wall that is substantially non-curved for mating with a substantially non-curved one of the pair of tail members.
8. The printing press cylinder of claim 7 in which said pressing means includes a locking member located between the curved wall and the second wall for pressing the curved tail member against the curved wall.
9. The printing press cylinder of claim 8 in which said pressing means includes means for rotating said locking member within the cavity between a locked position in which it causes the curved tail member to be pressed against the curved wall, and an unlocked position in which the curved tail member is not pressed against the curved wall.
10. The printing press cylinder of claim 8 in which said locking member is resilient.
11. The printing press cylinder of claim 6 in which said pressing means presses against a curved tail member in a direction which is substantially normal to a plane of contact therewith to substantially reduce longitudinal strain on and distortion of the curved tail.
12. The printing press cylinder of claim 6 in which said curved wall is approximately involute.
13. The printing press cylinder of claim 6 in which said wall has a plurality of wall segments interconnected to approximate a substantially curved shape of the curved wall.
14. The printing press cylinder of claim 6 in which said walls are separated in a fixed position to provide the gap with a permanent dimension substantially less than 0.123 inch.
15. The printing press cylinder of claim 6 in which said gap is selected to have a fixed dimension less than 0.050 inch larger than the thickness of the plate body.
16. The printing press cylinder of claim 6 in which said gap has a leading edge and a lagging edge, and the curved wall joins with the lagging edge.
17. The printing press cylinder of claim 6 in combination with a printing plate with a substantially curved tail member pressed against the substantially curved wall.
18. The printing press cylinder of claim 17 in which both the substantially curved tail member and the substantially curved wall are substantially involute in shape.
19. A method of mounting a printing plate to a cylinder of a rotary printing press, comprising the steps of:
bending the opposite ends of a printing plate stock to form a pair of first and second tail members at opposite ends of an intermediate planar body with said second tail member being bent in a substantially involute shape;
inserting the first tail member in a mounting slot in the cylinder;
conveying the intermediate body around the cylinder;
inserting the second, curved tail member into the slot between a lagging edge of the slot and the first tail member.
bending the opposite ends of a printing plate stock to form a pair of first and second tail members at opposite ends of an intermediate planar body with said second tail member being bent in a substantially involute shape;
inserting the first tail member in a mounting slot in the cylinder;
conveying the intermediate body around the cylinder;
inserting the second, curved tail member into the slot between a lagging edge of the slot and the first tail member.
20. The method of claim 19 including the step of pressing the second curved member against a correspondingly curved wall of a cavity in communication with the slot to frictionally hold the second tail member with the slot.
21. The method of claim 20 in which said step of pressing is performed in a direction substantially normal to the surface of the second curved tail member at a location thereon where it is pressed to avoid straining the tail member.
22. In a cylinder of a rotary printing press having a gap for mounting receipt of a pair of tail members at opposite ends of a flexible body of a printing plate, the improvement being a narrow gap mounting apparatus for holding the tail members within the mounting gap, comprising:
a cavity within the cylinder and having a pair of walls extending inwardly and backwardly away from each other and from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of inwardly and backwardly extending walls, respectively, when fully inserted in the slot, a locking mechanism within the cavity and including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto and extending away from the other wall to frictionally hold it within the cavity wherein said mating wall is substantially curved.
a cavity within the cylinder and having a pair of walls extending inwardly and backwardly away from each other and from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of inwardly and backwardly extending walls, respectively, when fully inserted in the slot, a locking mechanism within the cavity and including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto and extending away from the other wall to frictionally hold it within the cavity wherein said mating wall is substantially curved.
23. The printing press cylinder of claim 22 in which said locking member is in a direction away from the one tail member.
24. The printing press cylinder of claim 22 in which the locking member is substantially, relatively resilient compared to the pair of walls.
25. The printing press cylinder of claim 23 in which the moving means includes means for rotating the locking member to a locked position in which it is pressed against one of the tails.
26. The printing press cylinder of claim 22 in which said rotating means includes a worm gear linked to the locking member.
27. In a cylinder of a rotary printing press having a gap for mounting receipt of a pair of tail members at opposite ends of a flexible body of a printing plate, the improvement being a narrow gap mounting apparatus for holding the tail members within the mounting gap, comprising:
a cavity within the cylinder and having a pair of walls extending from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of walls, respectively, when fully inserted in the slot, the gap having a leading edge and a lagging edge, the mating wall against which said one of the tails is pressed being joined to the lagging edge;
a locking mechanism within the cavity including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto to frictionally hold it within the cavity wherein said mating wall is substantially curved.
a cavity within the cylinder and having a pair of walls extending from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of walls, respectively, when fully inserted in the slot, the gap having a leading edge and a lagging edge, the mating wall against which said one of the tails is pressed being joined to the lagging edge;
a locking mechanism within the cavity including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto to frictionally hold it within the cavity wherein said mating wall is substantially curved.
28. In a cylinder of a rotary printing press having a gap for mounting receipt of a pair of tail members at opposite ends of a flexible body of a printing plate, the improvement being a narrow gap mounting apparatus for holding the tail members within the mounting gap, comprising:
a cavity within the cylinder and having a pair of walls extending from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of walls, respectively, when fully inserted in the slot;
a locking mechanism within the cavity and including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto to frictionally hold it within the cavity, the mating wall against which one of the tails is pressed having a substantially involute shape.
a cavity within the cylinder and having a pair of walls extending from the gap which are conformed relative to the pair of tail members to receive the pair of tail members in mating, overlying relationship with the pair of walls, respectively, when fully inserted in the slot;
a locking mechanism within the cavity and including a locking member, and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto to frictionally hold it within the cavity, the mating wall against which one of the tails is pressed having a substantially involute shape.
29. The printing plate of claim 1 in combination with a printing pressure rotary cylinder with a surface around which the planar body is wrapped and a mounting gap within which both the first and second tails are received together.
30. The printing press of claim 6 in which said walls are separated to provide the gap with a dimension substantially less than 0.123 inch and said gap is the only gap in the cylinder.
31. The printing press of claim 6 in which said gap has a leading edge and a lagging edge, the curved wall joins with the lagging edge, and said gap is the only gap in the cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US51353890A | 1990-04-24 | 1990-04-24 | |
| US513,538 | 1990-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2038809A1 CA2038809A1 (en) | 1991-10-25 |
| CA2038809C true CA2038809C (en) | 1998-12-08 |
Family
ID=24043688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2038809 Expired - Fee Related CA2038809C (en) | 1990-04-24 | 1991-03-21 | Narrow gap plate mounting apparatus and method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0453794B1 (en) |
| JP (1) | JPH04224954A (en) |
| CA (1) | CA2038809C (en) |
| DE (2) | DE453794T1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4404758C2 (en) * | 1994-02-15 | 1996-06-27 | Roland Man Druckmasch | Method and device for changing the covering of a cylinder of a web-fed rotary printing press |
| FR2737149B1 (en) * | 1995-07-25 | 1997-10-17 | Heidelberg Harris Sa | DEVICE FOR FIXING A PRINTING PLATE ON A PLATE-HOLDING CYLINDER |
| DE19642141C1 (en) * | 1996-10-12 | 1998-06-18 | Koenig & Bauer Albert Ag | Device for releasing plates |
| JP4666707B2 (en) * | 1999-12-21 | 2011-04-06 | 株式会社ミヤコシ | Plate quick holding device in plate cylinder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3022728A (en) * | 1959-11-12 | 1962-02-27 | American Type Founders Co Inc | Printing plates and methods and apparatus for forming them |
| US3408933A (en) * | 1966-03-24 | 1968-11-05 | Miehle Goss Dexter Inc | Continuous take-up clamping arrangement for blanket in printing press |
| DE2334127A1 (en) * | 1973-07-05 | 1975-01-23 | Koenig & Bauer Ag | Plate cylinder for flexible printing plate - clamping body attached to spring strip in cylinder groove |
| US4214530A (en) * | 1978-02-23 | 1980-07-29 | Glanzner Gary C | Metal printing plate |
| DE3470688D1 (en) * | 1983-11-14 | 1988-06-01 | De La Rue Giori Sa | Plate cylinder with a device for affixing gravure printing plates for a web-printing machine |
-
1991
- 1991-03-21 CA CA 2038809 patent/CA2038809C/en not_active Expired - Fee Related
- 1991-03-26 DE DE1991104754 patent/DE453794T1/en active Pending
- 1991-03-26 DE DE1991604764 patent/DE69104764T2/en not_active Expired - Fee Related
- 1991-03-26 EP EP91104754A patent/EP0453794B1/en not_active Expired - Lifetime
- 1991-04-23 JP JP9181191A patent/JPH04224954A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE69104764D1 (en) | 1994-12-01 |
| DE453794T1 (en) | 1992-02-06 |
| EP0453794B1 (en) | 1994-10-26 |
| EP0453794A1 (en) | 1991-10-30 |
| CA2038809A1 (en) | 1991-10-25 |
| DE69104764T2 (en) | 1995-05-04 |
| JPH04224954A (en) | 1992-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |