US2547471A - Rotary offset printing machine interrupter - Google Patents

Rotary offset printing machine interrupter Download PDF

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Publication number
US2547471A
US2547471A US652262A US65226246A US2547471A US 2547471 A US2547471 A US 2547471A US 652262 A US652262 A US 652262A US 65226246 A US65226246 A US 65226246A US 2547471 A US2547471 A US 2547471A
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United States
Prior art keywords
drum
master
drums
latch
shaft
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Expired - Lifetime
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US652262A
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English (en)
Inventor
Edward J Janke
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AB Dick Co
Original Assignee
Multigraphics Inc
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Filing date
Publication date
Priority to BE462054D priority Critical patent/BE462054A/xx
Priority claimed from US573280A external-priority patent/US2547470A/en
Application filed by Multigraphics Inc filed Critical Multigraphics Inc
Priority to US652262A priority patent/US2547471A/en
Application granted granted Critical
Publication of US2547471A publication Critical patent/US2547471A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L19/00—Duplicating or printing apparatus or machines for office or other commercial purposes, of special types or for particular purposes and not otherwise provided for

Definitions

  • the invention of this application relates to a rotary printing machine operating on the planegraphic principle.
  • the general object of the invention is to provide such a machine which shall have means for transferring an image from a master sheet to a transfer blanket in an enicient manner, and which shall reproduce on the transfer blanket an image corresponding accurately with the image on the master sheet, so that an accurate impression will be made on the paper printed.
  • a more particular object of the invention is to control the approach of the master drum carrying the image to the offset drum carrying the transfer blanket so that actual contact of the two drums shall start in advance of the presentation of the image to the blanket, and thus the actual transfer of the image shall always be by rolling contact, thereby avoiding the smudging or distortion of the transferred image likely to result from a radial or blow contact.
  • my invention provides means for causing a master drum to contact with the offset drum only when a gap in one of the drums faces the other drum.
  • FIG. 1 is a vertical section through the machine, the offset blanket being illustrated merely in conventional form
  • Fig. 2 is a side elevation of 1atching mechanism for retaining the offset drum in coaction with the master drum and platen but allowing its immediate separation from both such members, this view showing the drums in their separated or inactive position
  • Fig. 3 is a view of the same parts with the latch in another position and the drums in their coacting position
  • Fig. 4 is a side elevation of certain parts of the machine outside of the right hand frame plate and in plane parallelwith Fig. 1
  • Fig. 5 is a section immediately broken away through the offset drum on a plane indicated by the line 5-5 on Fig. 1
  • Fig. 6 is a sectional elevation on a plane parallel with Figs. 1 and 4 showing some of the gearing employed in the machine.
  • FIG. 5 there is shown two spaced vertical frame plates I0 and II parallel with each other which together with bracing cross rods, constitute the main frame of the machine. Plate Ii] also appears in Fig. 4 and the plate II in Figs. 1 and 6. Ordinarily these frame plates and the machine carried thereby rest on a suitable base or stand indicated at l5 in Fig. 1. This stand may house a driving motor I6 connected by a belt I! with a pulley I 8 of the printing machine.
  • the printing machine includes a master sheet carrying drum 20, an offset drum 3i ⁇ and a platen All all suitably mounted between the two plates I0 and I I. Between these plates also is an inking mechanism 50 adapted to deliver ink to the master sheet 22 on the drum 2a, and a normally acting ink repellent applying mechanism 60 acting on a region of the master sheet in advance of the inking mechanism.
  • the master drum 20 is provided with an axially extending recess 23 in which is mounted an attaching means, generally indicated at 24, for attaching a printing plate'to the drum.
  • the master drum 253 is rigidly mounted on a shaft 2
  • the offset drum 30 is rotatably mounted on an eccentric central portion of a shaft 3I which is mounted in the two frame plates in a manner capable of a partial rotation, by which the position of the offset blanket 33 is adjusted with reference to both the master sheet and the platen as hereinafter described.
  • the platen 4! is rotatably mounted on an eccentric intermediate portion of a shaft 4
  • spring units 45 one of which is shown in Fig. 1
  • Each unit 45 includes a spring #24 which bears at its lower end against a fixed cross bar 55 carried by the two frame plates IE3 and I I. At their upper ends each spring acts against an adjustable stop 4'! on a screw as, the upper end of which is anchored to the yoke and the lower end of which. passes through the cross bar 45, and is provided with a nut 49. These nuts provide adjustable limits for the upward movement of the platen yoke.
  • the inking mechanism 55 comprises a fountain 5! adapted to contain ink. a fountain roller 52 therein, a swinging ductor roller 53, a longitudinally reciprocable distributing roller 55, and a form roller 55. The latter coacts with the master sheet 22 on the drum 2%] and with the distributing roll 54.
  • the form roll 55 may be manually separated from the master sheet 22 to facilitate the initial application of ink-repellent thereto, as well as to facilitate the substitution of one master sheet for another.
  • the form roll 55 is mounted between a pair of plates 55 pivoted to the respective frame plates [0 and H and drawn by springs El toward the master sheet under the control of an adjustable stop screw 53.
  • a suitable cam rod 59 rotatively mounted in the frame plates is adapted to be turned by the operation of a hand lever 5911, Fig. 4, to cam the plates 56 in a direction to separate the form roll from the drum.
  • the normal ink repellent applicator mechanism which acts on the master sheet during each revolution of the master drum, as illustrated in Fig. 1, comprises a trough 6! adapted to contain a liquid ink repellent, a fountain roll 62 immersed therein, a swinging ductor roll 53 and an absorbent form roll fi l.
  • the form roll is mounted in a pair of pivoted end bars 65 which are drawn toward the master drum 20 by springs 66 under the control of adjustable stop screws 51.
  • the ductor roll 53 oscillates between the fountain roll 52 and the form roll 64 to deliver repellent to the master sheet.
  • the two ductor rolls 53 and 53, as well asthe fountain rolls 52 and 62, for the ink and repellent respectively are operated at the same time by a single cam 10 secured to the offset drum 30, which is driven by suitable gearing as hereinafter explained.
  • This cam Tl acts against a roller N (Fig. 4) on a lever 29 secured to a stub shaft 13 journalled in the frame plate in.
  • a second lever 12 is secured intermediate its ends to the stub shaft '53 and is connected by a link M- with mechanism not shown for periodically turning the ink fountain roll 52.
  • the offset drum may be released from both the master drum and the platen by turning the eccentrio shaft 3! on which the offset drum is mounted.
  • This shaft is normally in the position shown in Figs. 1 and 3.
  • a cam 34 is secured to the shaft 3! and a spring 39 is connected between this cam and the frame plate Hi to swing the shaft in a counter-clockwise direction and thereby move the offset drum away from both the platen and the master drum.
  • a latch 3'! which is retained in engagement with a tooth 36 on the cam by a spring 35.
  • the latch 31 has a suitable lateral extension 38 projecting through an opening in the cover on that side, so that whenever desired the latch may be withdrawn from the cam 34 by manual pres- 4 sure against the extension 38. This releases the cam 34 and permits the spring 39 to swing the offset drum shaft and bring the offset drum to its inactive position, shown in Fig. 2.
  • the operator grasps a handle or knob 32 which is secured to the shaft 3
  • a portion of the handle is shown at 32 in Fig. 5, and it is indicated in broken lines in Fig. 4.
  • the master drum and the offset drum be brought into position to contact with each other only at a time when a gap in one of the drums is juxtaposed to the other drum, because this avoids any blow or radial impact on the image, which might tend to blur the reproduction.
  • the gap referred to is on the master drum.
  • the lever 72 is so timed with relation to the drums that it is swinging in counterclockwise direction whenthe gap of the master drum is passing the blanket drum.
  • the pawl 82 acts on the dog 8
  • the arrangement is such that the pawl will engage the dog 8
  • repellent is first applied to the master sheet and then ink applied, while the offset blanket is held out of contact with the master sheet. Then the master drum may be rotated about four revolutions, retaining it still out of contact with the master sheet to build up the inked image on the master sheet without further application of repellent. Then by rotating the master drum about four more revolutions, with the ink and normal repellent mechanism 5? ⁇ and 68 respectively in active engagement with the master sheet, and with the offset blanket in contact with the master sheet, a properly inked image will be produced on the offset blanket.
  • These preliminary rotations of the master drum 2?) may be produced by power, by turning the motor switch off and on, or by a hand wheel provided on some member rotating with the drum. Such wheel is indicated at 2? in Fig. 1 as being on the master drum shaft 2 I.
  • the motor After the image has been properly built up on the blanket cylinder, and the motor is running to drive the various parts, it is only necessary to feed sheets to the bite of the blanket and platen drums to effect printing.
  • the sheetsto be printed are fed from the suitable tray 9? carried by the frame of the machine and projecting at the forward end thereof and adapted to carry a number of sheets with their edges fanned out so that they can be manually shoved one after another toward the printing machine.
  • a lower feed roller NH and a coacting upper roller I02.
  • Each of these rollers is made in two longitudinally spaced sections mounted on suitable shafts. Behind the line of contact of the two feed rollers is a stop finger I83 mounted on a pivoted bar I04 and counterweighted by a forwardly extending plate I515.
  • the shaft of the upper feed roller I02 is journalled in a yoke frame I86 which is pivoted at It? and carries a roller I08 which coacts with a cam Iile secured to the offset drum (Figs. 1 and 5).
  • This cam for the most part is concentric as shown in Figv 1 and by acting on the roller I88 maintains the upper feed roller out of contact with the lower feed roller and allows the counterweighted stop fingers to standin the position shown in Fig. 1, thus preventing the shoving of the paper to printing position.
  • the paper feed rolls are held separated while the master sheet is being prepared for the printing operation.
  • the latch mechanism 34, 35, 36, 31 which is used to separate the olfset and master drums during the period of preparation, as heretofore described.
  • a roller H5 is mounted on the yoke I36 which carries the upper feed r011 I92. When the offset drum shaft is in its idle position (Fig. 2) this roller is engaged by the cam 34 in such manner as to swing the yoke I06 to raise the upper feed roll M2.
  • the cam 34 performs three functions; it holds the feed rollers separate when the drums are idle; it prevents the positioning of the blanket drum except When the gap of the master drum is opposite it, and it retains the blanket drum in its active position when it has been so placed until released by the actuation of the finger member 38 on the latch 37.
  • a suitable gearing may be used to rotate the various rotatable parts of the machine, I will, for completeness, describe the particular gearing so far as it app-ears in the drawings.
  • the motor I6 by its belt I'I operates a large sheave I8 which is on a shaft I26 rigidly carrying a pinion EZI.
  • This pinion is shown as meshing with the gear I22 on a stub shaft I23 carrying the pinion I28 (Fig. 6).
  • the pinion I28 meshes with a pinion I24, which meshes with a gear I25 on the master drum 2B.
  • the pinion I24 also is shown as meshing with a gear I27 on the shaft of the distributing roll 54 of the inking systern.
  • the gear I25 on the master drum which has a pitch circle corresponding to the periphery of the mounted master sheet, is shown as meshing with an equal size gear I36 (Fig. 6) on the offset drum. This latter gear meshes with a gear I3I on the platen shaft 4
  • an offset printing machine including a frame having a master drum and a transfer drum, means to rotate said drums in timed relation with each other, one of said drums being mounted for rotation on .
  • a shaft eccentrically mounted in the frame to move such drum into and out of contact with the other drum, means constantly tending to separate said drums, a latch normally acting to retain said drums in a contacting relation and manually releasable at any time during the revolution of the drums whereby the drums may be separated at any time
  • manually operated means to reset said drums in a contacting relation
  • means including a latch plate on said shaft to cooperate with the latch, resilient means to hold the latch in a latching position, and a second latch to cooperate with the latch plate tolatch the shaft in a drum separating position against the action of the resetting means, and means operating in timed relation with the rotation of the drum to release said last named latch at a predetermined point in the revolution of the master drum and hold the latch released for a predetermined portion of the cycle of revolution of the
  • An offset printing machine having an arm integrally carried by the manually releasable latch and accessible to the operator, a pair of spaced abutments' on the latchplate to engage respective latches; resilient means tending to move the second named latch into the path of itsrespectiveabutment, an operating member accessible tothe operator manually operable to reset the drums and mounted on the eccentric shaft, aswingingar'moperating in timed relation with the rotation of the drums, and a pawl carried onsaid arm to engage the second named latch to move it out of engagement with its abutment whereupon the drums maybe reset manually.
  • An onset printing machine accordin to claim 2 having a Sheet feeding mechanism to feed sheets to be printed to the offset drum, and means carried by said latch plate and coacting. with said mechanism to cause said mechanism to fa'ilto feed a sheet when the drums are separated.
  • the sheet feeding mechanism includes a pair of feed rolls, a pair of pivoted arms, one of said rolls being mounted in said arms for movement toward and fromthe other roll, means normally tending to hold said rolls in a coacting relation, and means carried by said arms and adapted to be engaged by said latchplate to separate said rolls when the drums separate.
  • an offset printing machine including a frame having a master drum and a transfer drum, 2, platen, means to rotate said drums in timed relation with each other, one of said drums being mounted for movement toward and from the other drum whereby the drums may be brought into contact with each other or separated, means constantly tending to separate said drums, a manually releasable latch normally acting to retain said drums in a contacting relation, manually operable means to reset saiddrums in a contacting relation, releasable means to prevent resetting of said drums, means to release said last named releasable means during a predetermined portion of the cycle of rotation of the master drum and yet permit separation of said drums at any time during the cycle of revolution of said drums, consequent upon the release of said releasable latch a pair of feed rolls to feed sheets to the bite of said platen and offset drum, one of said rolls being movably mounted, means constantly tending to retain said rolls in a coacting relation, and means responsive to the movement of the movable
  • a frame having a master drum and a transfer drum and a platen roller, means to rotate said drums and roller in timed relation with each other, said transfer drum being rotatably mounted on a shaft eccentrically journalled in said frame whereby rotation of said shaft moves said transfer drum into and out of contact with said master drum, a latch plate secured to said shaft, means to bias said shaft in a position with the transfer drum out of contact with the master drum, a latch member coacting with said plate to oppose the action of said biasing means and maintain said shaft in a position with the drum in contact, said latch member bein manually releasable at any time during the operation of said drums, a manually operable means on said shaft for turning said shaft against the action of said biasing means into cooperation with said latch, a second latch to engage said latch plate and restrain movement of said shaft by the opei anon (if said manually operable means', means to bias-said" latches for engagement with said latch plate, a lever pivoted to said frame
  • A- printing machine ha vihg apair'of coasting feed rolls to feed sheets t'o the'bi teof said transfer drum and platefi roller, a pair of armspivoted to said frame intermediate their ends, one of said rolls" being rotatably' mountedin said arms adjacent one e'n'd thereof and extending therebetween, a roller mounted on the opposite end of one of said arms and adapted to engage the periphery of said latchplate, andwherein said latch plate is provided with acam portion to engage said-roller and move said arms to separate said feed rolls when the cam plate moves out of engagement withsaid first named latch.
  • a frame having a master drum and a transfer drum, means to rot'ate said drum in timed relation with each other, said transfer drum being rotatably mounted ona shaft eccentrically journalled in the frame to move said transfer drum intoand out of contact with said master drum, a latch plate secured to said shaft, resilient means interposed between said plate and frame to bias said shaft toa position with the transfer drum out of contact with the master drum, a latch manually releasable at any time during the revolution of said drums, said latch member being pivoted to said frame and coacting with said plate to retain said plate and shaft in position with the transfer drum in contact with the master drum, manually operable means on said shaft for turning said shaft against the action of said spring and into cooperation with said latch, a second latch pivoted to said frame and coacting with said latch plate to restrain operation of said manu-- ally' operable means, resilient means interconnecting said latches to bias them for engagement with said latch plate, a lever pivoted to said frame, means to oscillate said
  • a frame having a master drum having a printing plate posi tioned on a portion of its periphery and having a portion of its periphery extending substantially from end to end thereof uncovered by said printing plate, a transfer drum and a platen roller together with means to rotate said drums and roller in timed relation with each other, said transfer drum being rotatably mounted on a shaft eceentrically journalled in the frame whereby rotation of said.
  • said manually operable means resilient means to bias said latches for engagement with said member
  • a lever pivoted to said frame means carried by one of said drums to swing said lever back and forth once during each revolution of said drums, and means on said lever to momentarily move said second named latch momentarily to a released position only when the uncovered portion of the master drum is in position to coact 15 with the transfer drum.

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US652262A 1945-01-17 1946-03-06 Rotary offset printing machine interrupter Expired - Lifetime US2547471A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE462054D BE462054A (en)van) 1945-01-17
US652262A US2547471A (en) 1945-01-17 1946-03-06 Rotary offset printing machine interrupter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US573280A US2547470A (en) 1945-01-17 1945-01-17 Ink fountain interrupter for rotary printing machines
US652262A US2547471A (en) 1945-01-17 1946-03-06 Rotary offset printing machine interrupter

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US2547471A true US2547471A (en) 1951-04-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689522A (en) * 1949-10-11 1954-09-21 Addressograph Multigraph Inking and moistening means for rotary planographic printing machines
US2737109A (en) * 1951-04-23 1956-03-06 Ditto Inc Inking means for rotary direct printing lithographic duplicators
US2798425A (en) * 1953-02-24 1957-07-09 Davidson Corp Inking and dampening means for offset presses
US3039386A (en) * 1958-08-18 1962-06-19 Nelson W Trisler Offset image forming head
US3593659A (en) * 1968-06-26 1971-07-20 Polaroid Corp Offset printing apparatus having disposable dampening and inking means

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US966256A (en) * 1909-04-13 1910-08-02 Harris Automatic Press Co Printing-press.
US1300289A (en) * 1917-04-13 1919-04-15 Robert Miehle Tripping mechanism for rotary printing-presses.
US1301970A (en) * 1916-02-12 1919-04-29 Harris Automatic Press Co Printing-press.
US1463562A (en) * 1917-05-04 1923-07-31 Miehle Printing Press & Mfg Offset printing press
US1647560A (en) * 1926-03-04 1927-11-01 American Multigraph Co Platen-controlling mechanism for printing machines
US1789420A (en) * 1929-01-19 1931-01-20 American Bank Note Co Printing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US966256A (en) * 1909-04-13 1910-08-02 Harris Automatic Press Co Printing-press.
US1301970A (en) * 1916-02-12 1919-04-29 Harris Automatic Press Co Printing-press.
US1300289A (en) * 1917-04-13 1919-04-15 Robert Miehle Tripping mechanism for rotary printing-presses.
US1463562A (en) * 1917-05-04 1923-07-31 Miehle Printing Press & Mfg Offset printing press
US1647560A (en) * 1926-03-04 1927-11-01 American Multigraph Co Platen-controlling mechanism for printing machines
US1789420A (en) * 1929-01-19 1931-01-20 American Bank Note Co Printing machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689522A (en) * 1949-10-11 1954-09-21 Addressograph Multigraph Inking and moistening means for rotary planographic printing machines
US2737109A (en) * 1951-04-23 1956-03-06 Ditto Inc Inking means for rotary direct printing lithographic duplicators
US2798425A (en) * 1953-02-24 1957-07-09 Davidson Corp Inking and dampening means for offset presses
US3039386A (en) * 1958-08-18 1962-06-19 Nelson W Trisler Offset image forming head
US3593659A (en) * 1968-06-26 1971-07-20 Polaroid Corp Offset printing apparatus having disposable dampening and inking means

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