Patent US3678849A successfully refreshed from Google Patents.
US3678849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctor blade oscillatable between plate cylinder and ink transfer roll
Assignee: Western Printing Machinery Co
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Filing: 1970-10-02
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Granted: 1972-07-25
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Expires: 1990-10-02
Abstract
Abstract An oscillating doctor blade used in a rotary intaglio printing press having a transfer roller, a form roller and a printing plate cylinder adjacent the transfer roller, for conserving ink by scraping the excess ink off the etched or engraved surface of the printing plate and then swinging the ink-gathering face of the doctor blade so as to carry the excess ink into direct contact with the adjacent transfer roller for immediately feeding back the ink into the press inking train for use in the next inking and printing operation.
Inventors
- 👤 Ray D Musgrave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:32
CPC Classifications
B; B41; B41F; B41F9/00; B41F9/06; B41F9/08; B41F9/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
In a rotary intaglio printing press for immediately feeding back the excess ink scraped from the printing plate to the inking train having a frame, a plate cylinder journaled for rotation of the frame, a printing plate mounted on the plate cylinder, a form roller journaled on the frame in rolling contact with the plate cylinder, and a transfer roller journaled on the frame adjacent the plate cylinder in rolling contact with the form roller, the improvement comprising: a doctor blade, means for mounting said doctor blade for oscillation about an axis parallel with the axis of the plate cylinder between an angular scraping engagement with the printing plate and a discharge position wherein the ink gathering face of the blade contacts the transfer roller, and means for oscillating the doctor blade in timed relation with the rotation of the plate cylinder therebetween.
Claim 2
Dependent Claim
143 words
In a rotary intaglio printing press for immediately feeding back the excess ink scraped from the printing plate to the inking train having a frame, a plate cylinder journaled for rotation of the frame, a printing plate mounted on the plate cylinder, a form roller journaled on the frame in rolling contact with the plate cylinder, and a transfer roller journaled on the frame adjacent the plate cylinder in rolling contact with the form roller, the improvement comprising: a doctor blade, means for mounting said doctor blade for oscillation about an axis parallel with the axis of the plate cylinder between an angular scraping engagement with the printing plate and a discharge position wherein the ink gathering face of the blade contacts the transfer roller, and means for oscillating the doctor blade in timed relation with the rotation of the plate cylinder therebetween.
Claim 3
Dependent Claim
28 words
A rotary intaglio printing press according to claim 1 wherein means is provided for adjusting the angular engagement of the doctor blade with respect to the printing plate.
Claim 4
Dependent Claim
102 words
In the rotary intaglio printing press of claim 2 wherein the doctor blade angle adjusting means comprises: a bushing mounted in the cam lever arm, a block having opposite faces with a hole having an axis perpendicular to and through opposite faces therein, a stub shaft depending from one face on the block at right angles to the axis of the hole journaled in the bushing, a threaded bar slidably mounted in the hole in the block engaging jamb nuts against the opposite faces of the block, said threaded bar pivotally connected to the doctor blade lever arm at its other end.
Claim 5
Dependent Claim
25 words
A rotary intaglio printing press according to claim 1 wherein means is provided to limit the engagement of the doctor blade with the printing plate.
Claim 6
Dependent Claim
25 words
A rotary intaglio printing press according to claim 1 wherein means is provided for adjusting the pressure of the doctor blade against the printing plate.
Claim 7
Dependent Claim
102 words
In the rotary intaglio printing press of claim 5 wherein the doctor blade pressure adjusting means comprises: a bushing mounted in the cam lever arm, a block having opposite faces with a hole having an axis perpendicular to and through opposite faces therein, a stub shaft depending from one face on the block at right angles to the axis of the hole journaled in the bushing, a threaded bar slidably mounted in the hole in the bLock engaging jamb nuts against the opposite faces of the block, said threaded bar pivotally connected to the doctor blade lever arm at its other end.
Claim 8
Dependent Claim
31 words
A rotary intaglio printing press according to claim 1 wherein means is provided to adjust the contact pressure of the doctor blade against the transfer roller in the ink discharge position.
Claim 9
Dependent Claim
94 words
In the rotary intaglio printing press of claim 7 wherein the means for adjusting the contact pressure of the doctor blade against the transfer roller comprises: a bracket support shaft, a plurality of doctor blade throw brackets supporting swing bar mounted for adjustable angular position on the bracket support shaft, a block with a hole pivotally mounted to the frame, a threaded bar slidably mounted in the hole in the block engaging jamb nuts against the opposite sides thereof, said threaded bar pivotally connected to the doctor blade throw bracket at its other end.
Claim 10
Dependent Claim
170 words
In the rotary intaglio printing press of claim 1 wherein the means for oscillating the doctor blade comprises: a swing bar parallel to the axis of the blade cylinder journaled to oscillate in a bracket means mounted on the frame, a doctor blade lever arm mounted on the cylindrical end of the swing bar having an outside end, a cam lever arm pivotally mounted on the frame having a far end, a change-in-length link adjusting means pivotally connecting the outside end of the doctor blade lever arm and the far end of the cam lever arm, a cam coaxially mounted on and constrained to rotate with the plate cylinder in cooperation with the cam follower to move the cam lever in timed relation with respect to the rotation of the printing plate on the plate cylinder, a pneumatic cylinder pivotally mounted at one end on the frame and pivotally connected to the cam lever arm at the other end energized to induce the cam follower to cooperate with the cam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |