US86021A - Improvement in the manufacture of curved electrotype and stereotype plates - Google Patents
Improvement in the manufacture of curved electrotype and stereotype plates Download PDFInfo
- Publication number
- US86021A US86021A US86021DA US86021A US 86021 A US86021 A US 86021A US 86021D A US86021D A US 86021DA US 86021 A US86021 A US 86021A
- Authority
- US
- United States
- Prior art keywords
- curved
- plate
- improvement
- manufacture
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 10
- 238000000034 method Methods 0.000 description 14
- 238000005452 bending Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 230000001419 dependent Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C3/00—Reproduction or duplicating of printing formes
Definitions
- the Object of our invention is to produce the curved plates from the dat plates or forms without altering the length across the face.
- the shell7 has been made dat in the usual way and then bent to the required extent ot' the curved plate. This moreorless lengthens the shell, according to the curvature and thickness of the shell and character ofthe surface, a smooth or plain surface not beingso much affected as adeeply-engravedone.
- the plate has been made dat in theusual way, and then bentto the fullcurve required. This also leugthens the plate to adegree dependent upon the curvature and thickness of the plate. Our improvement in a measure combines all these three processes.
- the mold A is made fiat in the usual way, as represented in Fig.
- the degree ofcurvature which is given to the mold relatively to the curvature which the nished plate is required to have will depend on the relative thicknesses of the mold or plate; but when molds and plates ot'ordinary thickness are used we find in practice that the curvature given to the mold should be about half of that which the plateis to have.
- the final curvature may be given to the shell before it is backed with the fusible metal or to the plate formed by the backing of the shell with fusible metal.
Description
UNTTEE STATES PATENT OFFICE.
HENRY LOVEJOY, HENRY w. LOVEJOY, AND JAMES H. FERGUSON, OE NEW YORK, N. Y.
IMPROVEMENT IN THE MANUFACTURE 0F CURVED ELECTROTYPE AND STEREOTYPE PLATES.
Specilieation forming part of Letters Patent No. 86,02l, Caled January 19, 1869.
To all whom fit may concern:
Be it known that we, HENRY LOVEJOY, HENRY W. LOVEJOY, and J AMES H. FERGU- SON, all ofthe city, county, and State of New York, have invented a new and useful Process ot Manufacturing'Curved Electrotype or Stereotype Plates, ot" which the followingis a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which- Figure l represents a sectional or edge View' Similar letters ot' reference indicate corresponding parts.
By none ot' the methods heretofore adopted can curved electrotype or stereotype plates be made from flat plates or forms without so altering the size in the direction ot the curve that the new or curved plate will not register7 with the original or iat plate or form, whereas it is very desirable in many cases that the fiat and curved plates should work together or register with each other-as, t'or instance, in colored or illuminated printing, and especially so in the printing ot' the several colors during one passage of the paper.
The Object of our invention is to produce the curved plates from the dat plates or forms without altering the length across the face.
To facilitate the explanation of the nature off the invention we will first refer brietiy to the well -known previous processes ot` forming curved electrotype or stereotype plates by way ot'showing why the same cannot assimilate with the original or tlat plates or forms, and of explaining how the ditliculty is obviated by our improvement. In one of these processes, after the impression has been taken from the lat plate, the mold has been bent to the full extentof the required curvature to make the curved plate, and then the metal cast or deposited on or in such curved mold. This method shortens the curved plate to an amount dependent upon the thickness or depth of themold and degree or extent ot' its curvature. In another of said processes the shell7 has been made dat in the usual way and then bent to the required extent ot' the curved plate. This moreorless lengthens the shell, according to the curvature and thickness of the shell and character ofthe surface, a smooth or plain surface not beingso much affected as adeeply-engravedone. In the third process the plate has been made dat in theusual way, and then bentto the fullcurve required. This also leugthens the plate to adegree dependent upon the curvature and thickness of the plate. Our improvement in a measure combines all these three processes. Thus the mold A is made fiat in the usual way, as represented in Fig. 1, and afterward is bent to a limited extent short of the full curvature required' to be given to the finished curved plate, as shown in Fig. 2. Aft-er depositing or casting in this partially-curved mold we further bend the shell or plate B to the full extent ot' the curvature required t'or the finished plate, as represented in Fig. 3. Now it will readily be seen that this subsequent bending ot' the shell or plate has a lengthening eiiect, which compensates for the shortening etl'ect produced by the bending ot' the mold, so that the duplicate or curved plate and original or tlat one are made to register. The degree ofcurvature which is given to the mold relatively to the curvature which the nished plate is required to have will depend on the relative thicknesses of the mold or plate; but when molds and plates ot'ordinary thickness are used we find in practice that the curvature given to the mold should be about half of that which the plateis to have.
In applying this invention to the manufacture ot' electrotypes the final curvature may be given to the shell before it is backed with the fusible metal or to the plate formed by the backing of the shell with fusible metal.
TVhat we claim, and desire to secure by Letters Patent, is
l. The process, substantially as herein described, ot' making curved electrotype or stereotype plates by tirst forming the impression in a flat mold, afterward giving said mold a curvature falling short of the required curvature ot' the `bend or duplicate plate to' be made, and after casting 0r depositing in such curved mold, subsequently bending the shell or plate to the full curvature required for the 1inished and duplicate plate, substantially as speciied.
2. Curved electrotype or stereotype plates made in the manner described, as a new arti.
cle of manufacture.`
HENRY LOVEJOY. HENRY W. LOVEJOY. JAMES H. FERGUSON.
Witnesses* OOR. R. DsosWAY, CHR. C'. LEIGH.
Publications (1)
Publication Number | Publication Date |
---|---|
US86021A true US86021A (en) | 1869-01-19 |
Family
ID=2155510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US86021D Expired - Lifetime US86021A (en) | Improvement in the manufacture of curved electrotype and stereotype plates |
Country Status (1)
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US (1) | US86021A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050027745A1 (en) * | 2002-03-05 | 2005-02-03 | Hidetomo Sohma | Moving image management method and apparatus |
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0
- US US86021D patent/US86021A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050027745A1 (en) * | 2002-03-05 | 2005-02-03 | Hidetomo Sohma | Moving image management method and apparatus |
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