US 258895 A
Description (OCR text may contain errors)
2 Sheets-Sheet 1.
J.v sv J. M. GRAWSHA'W.
Patented June 6, 1882.'
Kw1/w. 26 @MW "UNITED STATES PATENT OFFICE.
JOHN CRAWSHAW AND JOHN M. CRAWSHAW, CF CENTRAL FALLS, R. I.
STARCH- s PEcIFIcATIoN forming part of Letters Patent No. 258,895, dated .rune 6, 1882.
Application filed January 7, 1882. (No model.)
To all whom it may concern Be it known that we, JOHN CRAWSHAW and J OIIN M. CRAWSHAW, of Central Falls, in the county of Providence, in the State of Rhode Island, have invented an Improvement in- Starch-Mangles, of which the following is a specification.
Our invention relates to an improvement in for varying the angle of the doctor plate, as
hereinafter set forth.
Figure l represents a central transverse section of the machine. Fig. 2 represents a front elevation of the same. Fig. 3 represents sectional details, enlarged. Fig. 4 represents a section taken through the pivots of the doctorplate in the plane ofthe axis of the adjustingscrews.
In the ordinary starch-mangle the cloth, after passing` through the starch-fountain, passes between two pressure rolls, which serve to force the starch into the interstices of the threads and to remove the surplus starch from the surface of the cloth 5 but the action of such pressure-rolls upon the starched fabric is not of such a nature as to produce the proper desired effect, and for this reason it becomes necessary to pass the cloth two or three times through the machine,withintermediate drying of the starched goods, which entails expense and loss of time. We have so improved the man gie, by the employment of a doctor-plate held against the surface of the cloth with a yielding pressure by means of a weight or an equivalent spring, that a single passage of the cloth through the mangle is lamply sufficient for the full saturation of the fabric, and in lieu of the adjustment of the pressure-rolls inthe ordinary man gle we properly gage the quantity of starch to be left upon the fabric by changing the angular position of the inclined doctorplate with reference to the surface of the fabric. We are thus enabled to force the starch into the interstices of the threads and to properly smooth oft' the surface, as required, at one operation; and the substitution of a doctorplate operating under a yielding pressure, as
above mentioned, in lieu of the pressure-rolls heretofore employed in stareh-mangles, is the gist of our invention, producing highly desir- -able results, both with regard to the quantity of cloth which may be starched in a given time and inthe quality of the work performed.
In the drawings, A represents a trough for holding the starch. B B are standards at each end of the starch fountain A, for supporting the rolls. The starehing-roll Crests in its end bearings, with the lower surface ot the roll embedded in the starch of the fountain. The roll D, having a vacant space between its cylindrical surface and the surface of the roll C, is operatively connected to the roll C by means of the gears E E.
The web F to be starched is first placed in a rolled condition upon a removable shaft, G, held in suitable supports, H H, arranged at the opposite ends of the machine. The web passes from the roll I over the fixed stretching-bar J, thence under the roll C through the starchfountain, thence undeethe doctor-plate M, and through the space left vacant between the rolls C and D, to the winding-up rollKupon the shaft L, which is operated by the frictional contact of the rolled web with the surface of the roll D, as usual in such machines.
rlhe doctor-plate M, held in the jaws N N, is`
pivoted in the sliding boxes O O at opposite ends of the machine, and is held down upon the surface ofthe web by means of the weight P, made adjustable upon the arm Q, attached is in the angular position ain Fig. 3,thc starch will be forced into the web in a greater quanA tity than when in the angular position b, and in still greater quantity than when in the .position c. The yielding pressure upon the doctor-plate secured by the weight P provides for srs IOO
the passage of the spliced ends of thejfabric when several webs are joined in the same roll, as common in bleaching operations, rendering the employment of a rigidly-set doctor-plate impracticable.
5 We are aware that rigidly-set doctor-plates have been employed in printing-machines to remove the surplus ink from the fountain inkroll; but the employment of a rigidly-set doctor-plate for such a purpose is not analogous 1o to the employment of a yielding doctor-plate arranged to both remove the surplus starch from a web of freshly starched cloth and to l'orce the starch into the interstices ot' the threads of the fabric, for which purpose a rig- 15 idly-set doctor-plate would be impracticable.
We therefore claim as our invention- In a starch mangle, the starch fountaim JOHN CRAVVSHAV. JOHN M. CRAVVSHAVV.
C. MORRELL, P. SCHENCK, HARMON S. BABoooK, SOCRATES SCHOLFIELD.