US3783781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctor blade control mechanism, particularly for use in printing presses
Assignee: Individual
•
Filing: 1971-09-20
•
Granted: 1974-01-08
•
Expires: 1991-09-20
Abstract
Abstract To control the application pressure of a doctor blade against a cylindrical surface, for example a cylinder used in rotogravure printing, a parallelogram support for the doctor blade is provided having resilient, parallel arms to hold the doctor blade to move in an essentially radial direction with respect to the cylindrical surface against which the doctor blade is adapted to bear, and a deflection meter is secured to the doctor blade support, measuring the resilient deflection of the doctor blade holder with respect to the support; the meter may be included in an electrical control circuit which re-sets the holder with respect to the support so that the application pressure of the doctor blade against the cylindrical surface will be uniform.
Inventors
- 👤 S Grommek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:23
CPC Classifications
B; B41; B41F; B41F9/00; B41F9/06; B41F9/08; B41F9/10; B41F9/1036
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
200 words
In a rotary printing machine, apparatus having a doctor blade (5) and a press cylinder (1) against which the blade is applied under pressure and means (10) supporting the doctor blade, said apparatus comprising a holder secured to said support means (10) resiliently holding the doctor blade and comprising a blade carrier (6a, 6b, 6c); two parallel leaf springs (7) the leaf springs being secured to the blade carrier, and to the support means (10) to resiliently connect the blade carrier to the support means and permit relative movement between the blade carrier and the support means, the parallel leaf springs retaining the doctor blade in parallel position during any movement against or away from the press cylinder; means (A; 12, 22) pressing the support means to bias the ends of the leaf springs which are located adjacent the holder towards the press cylinder (1) to engage the doctor blade with said surface and apply said pressure; and means (9) secured to the support means measuring the deflection of the blade carrier with respect to the doctor blade support means (10) as the result of the pressure force exerted by said pressing means, as a measure of said applied pressure.
Claim 2
Dependent Claim
200 words
In a rotary printing machine, apparatus having a doctor blade (5) and a press cylinder (1) against which the blade is applied under pressure and means (10) supporting the doctor blade, said apparatus comprising a holder secured to said support means (10) resiliently holding the doctor blade and comprising a blade carrier (6a, 6b, 6c); two parallel leaf springs (7) the leaf springs being secured to the blade carrier, and to the support means (10) to resiliently connect the blade carrier to the support means and permit relative movement between the blade carrier and the support means, the parallel leaf springs retaining the doctor blade in parallel position during any movement against or away from the press cylinder; means (A; 12, 22) pressing the support means to bias the ends of the leaf springs which are located adjacent the holder towards the press cylinder (1) to engage the doctor blade with said surface and apply said pressure; and means (9) secured to the support means measuring the deflection of the blade carrier with respect to the doctor blade support means (10) as the result of the pressure force exerted by said pressing means, as a measure of said applied pressure.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1, wherein the leaf springs (7, 17) extend in planes essentially perpendicular to the reaction force due to resilient pressure of the doctor blade (5) against the press cylinder (1).
Claim 4
Dependent Claim
30 words
Apparatus according to claim 1, wherein the measuring means (9, 19) comprises a plunger (9a, 18) in contact with the holder and a pressure indicator measuring deflection of the plunger.
Claim 5
Dependent Claim
98 words
Apparatus according to claim 1, wherein the measuring means comprises a deflection transducer (9'', 11'' 19) measuring deflection variations of the blade carrier as a measure of pressure of the doctor blade against the cylinder and supplying an output signal indicative of doctor blade pressure against the press cylinder; and means (12, 13) are provided responsive to the output signal to move the holder (6) on the support (10) in response to a signal indicative of deviation of deflection, and hence application pressure from a predetermined value, to re-establish a predetermined doctor blade position, and hence application pressure.
Claim 6
Dependent Claim
66 words
Apparatus according to claim 1, wherein the press cylinder and the doctor blade are elongated, the doctor blade extending along the whole axial length of the cylindrical surface; a plurality of holders (6) for the doctor blade are provided clamping the doctor blade at spaced positions along said length; and a plurality of measuring means (9) are provided located along the length of the doctor blade.
Claim 7
Dependent Claim
50 words
Apparatus according to claim 1, wherein the holder for the doctor blade includes an elongated carrier plate (6c), the doctor blade being secured to said carrier plate; an elongated plate secured to the support means; and elongated leaf springs set on edge and interconnecting the elongated plates along their length.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 6, wherein the plates are formed with grooves (21), the leaf springs being set along their edges into the grooves of the respective plates.
Claim 9
Dependent Claim
63 words
Apparatus according to claim 1, wherein the holder includes a hollow profiled member (14) having four opposed wall portions, the top and bottom wall portions being secured to the doctor blade (5) and the support means (10), respectively; the front and rear side wall portions (17) being resilient and permitting relative deflection of the top and bottom wall portions in a parallelogram movement.
Claim 10
Dependent Claim
66 words
Apparatus according to claim 8, wherein the hollow profiled member has essentially rectangular cross-section, the front and rear wall portions being thin with respect to the top and bottom wall portions and being formed of the remainder of the front and rear wall portions, after removal of material from the front and rear wall portions to provide for resiliency of said front and rear wall portions.
Claim 11
Dependent Claim
28 words
Apparatus according to claim 1, wherein the measuring means engages the holder in a direction which is essentially radial with respect to the center of the cylindrical surface.
Claim 12
Dependent Claim
15 words
Apparatus according to claim 1, wherein the machine is in combination with a rotogravure press.
Claim 13
Dependent Claim
19 words
Apparatus according to claim 8 wherein the measuring means are located within the space defined by said wall portions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |