Patent US3878780A successfully refreshed from Google Patents.
US3878780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resiliently supported air bladder for biasing squeegees
Assignee: Alsacienne de Constructions Mecaniques SA
•
Filing: 1973-12-28
•
Granted: 1975-04-22
•
Expires: 1993-12-28
Abstract
Abstract In a machine of substantial width for printing on paper or fabrics with a rotary screen or an impression cylinder, the doctor blade which distributes the ink is applied against the screen or cylinder by means of a pneumatic bladder applied against a flexible strip which is attached to the blade-holder. The flexible strip compensates for pressure differences caused by the deflection to which the blade-holder is subjected when the machine is in operation.
Inventors
- 👤 Andre Lotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:07
CPC Classifications
B; B41; B41F; B41F15/00; B41F15/14; B41F15/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
203 words
An apparatus for use with a printing machine having a screen, comprising an elongated doctor-holder, a doctor including an elongated strip of thin flexible material having one longitudinal securing marginal portion secured in said doctor-holder and an opposite longitudinal free wiping marginal portion to be operably engaged against the screen of said printing machine, an elongated pneumatic pressure bladder longitudinally disposed in said doctor-holder and having an operating face operably contacting said doctor intermediate said marginal portions of said doctor adjacent said wiping marginal portion and an oppositely directed backing face, and an intermediate bearing member interposed between said backing face of said bladder and said doctor-holder, and wherein said intermediate bearing member includes a further elongated flexible metallic strip longitudinally disposed in said doctor-holder, said further strip having one longitudinal marginal portion rigidly secured in said doctor-holder and an opposite longitudinal marginal free portion, said backing face of said bladder bearing on said further strip between said two marginal portions and adjacent said free marginal portion of said further strip under stressed, bent condition of said further strip, whereby said operably engaged portion of said doctor is applied against the screen with a constant pressure over the entire length of said doctor.
Claim 2
Independent Claim
203 words
An apparatus for use with a printing machine having a screen, comprising an elongated doctor-holder, a doctor including an elongated strip of thin flexible material having one longitudinal securing marginal portion secured in said doctor-holder and an opposite longitudinal free wiping marginal portion to be operably engaged against the screen of said printing machine, an elongated pneumatic pressure bladder longitudinally disposed in said doctor-holder and having an operating face operably contacting said doctor intermediate said marginal portions of said doctor adjacent said wiping marginal portion and an oppositely directed backing face, and an intermediate bearing member interposed between said backing face of said bladder and said doctor-holder, and wherein said intermediate bearing member includes a further elongated flexible metallic strip longitudinally disposed in said doctor-holder, said further strip having one longitudinal marginal portion rigidly secured in said doctor-holder and an opposite longitudinal marginal free portion, said backing face of said bladder bearing on said further strip between said two marginal portions and adjacent said free marginal portion of said further strip under stressed, bent condition of said further strip, whereby said operably engaged portion of said doctor is applied against the screen with a constant pressure over the entire length of said doctor.
Claim 3
Independent Claim
203 words
An apparatus for use with a printing machine having a screen, comprising an elongated doctor-holder, a doctor including an elongated strip of thin flexible material having one longitudinal securing marginal portion secured in said doctor-holder and an opposite longitudinal free wiping marginal portion to be operably engaged against the screen of said printing machine, an elongated pneumatic pressure bladder longitudinally disposed in said doctor-holder and having an operating face operably contacting said doctor intermediate said marginal portions of said doctor adjacent said wiping marginal portion and an oppositely directed backing face, and an intermediate bearing member interposed between said backing face of said bladder and said doctor-holder, and wherein said intermediate bearing member includes a further elongated flexible metallic strip longitudinally disposed in said doctor-holder, said further strip having one longitudinal marginal portion rigidly secured in said doctorholder and an opposite longitudinal marginal free portion, said backing face of said bladder bearing on said further strip between said two marginal portions and adjacent said free marginal portion of said further strip under stressed, bent condition of said further strip, whereby said operably engaged portion of said doctor is applied against the screen with a constant pressure over the entire length of said doctor.
Claim 4
Independent Claim
203 words
An apparatus for use with a printing machine having a screen, comprising an elongated doctor-holder, a doctor including an elongated strip of thin flexible material having one longitudinal securing marginal portion secured in said doctor-holder and an opposite longitudinal free wiping marginal portion to be operably engaged against the screen of said printing machine, an elongated pneumatic pressure bladder longitudinally disposed in said doctor-holder and having an operating face operably contacting said doctor intermediate said marginal portions of said doctor adjacent said wiping marginal portion and an oppositely directed backing face, and an intermediate bearing member interposed between said backing face of said bladder and said doctor-holder, and wherein said intermediate bearing member includes a further elongated flexible metallic strip longitudinally disposed in said doctor-holder, said further strip having one longitudinal marginal portion rigidly secured in said doctorholder and an opposite longitudinal marginal free portion, said backing face of said bladder bearing on said further strip between said two marginal portions and adjacent said free marginal portion of said further strip under stressed, bent condition of said further strip, whereby said operably engaged portion of said doctor is applied against the screen with a constant pressure over the entire length of said doctor.
Claim 5
Dependent Claim
17 words
The apparatus as claimed in claim 1 in which said further strip is a sectional angle strip.
Claim 6
Dependent Claim
33 words
The apparatus as claimed in claim 1 in which an elongated shoe is longitudinally arranged in said doctor-holder between said operating face of said bladder and said free marginal portion of said doctor.
Claim 7
Dependent Claim
67 words
The apparatus as claimed in claim 1 in which said doctor-holder is provided with a longitudinal recess having a supporting face and an opposite backing face, said securing marginal portion of said doctor being engaged in said recess against said supporting face thereof, and a further elongated penumatic bladder longitudinally arranged in said recess between said backing face thereof and said securing marginal portion of said doctor.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |