US197507A - Improvement in pantographic engraving-machines - Google Patents

Description

- W. S. WIGHT. Pantographic Engraving Ma0hine.'

No. 197,507. Patented Nov. 27,1877.

WITNESSES INVENTOR ATTORN NLFETERS, FHOTO-LITHOGRAPHER. WASHINGTON D C UNITED STATES PATENT) WILLIAM S. WIGHT, OF GARRETTSVILLE, OHIO.

IMPROVEMENT :IN PANTOGRAPHIC ENGRAVING-MACH INES.

Specification forming part of Letters Patent No. 197,507, dated November 27, 1877; application filed August 2, 1876.

' Garrettsville, in the county of Portage and State of Ohio, have invented certain new and useful Improvements in Pantographic Engraving-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in pantographic engraving-machines; and consists in the adjustable working-table beneath the diminishing point of the pantograph, and the hinged and flanged tracing-table beneath the enlarging point of said pantograph, as will be hereinafter more clearly and fully set forth,

Figure l of the drawing represents a side view of a pantographic engraving-machine embodying my invention, and Fig.2 represeglts a plan view of my adjustable workingta e.

A represents the base of the machine, at the rear end of which is secured an arched beam or frame, B. This frameB,which serves as a standard or support to the pantograph, I

is made rigid, and this feature, in connection with my adjustable table or platform D, constitutes one of the main improvements over the device shown in Letters Patent to me, granted February 2, 1875, No. 159,488.

By the provision herein shown I am enabled to bring the work up to the point of the pantograph without disturbing the line of direction of the -pantograph itself, whereas inmy former device, above referred to, the pantograph is made vertically adjustable. By experience with said device, I have sometimes founddifficulty in operating upon irregular surfaces, and this difficultyhas been overcome by bringmg the work up to the pantograph-points instead of bringing the pantograph down to the work, and herein consists the essential feature of my invention.

To the said frame B is pivoted the swinging bed O,which extends forward and rests on the base A. Y i

D is the working-table, firmly secured to the upper end of the rack-carrying slide E.

F is a shaft, journaled in suitable bearings in, or attached to, the bed 0, and carrying on its inner end a pinion or small spur-gear, G, which engages with the rack on the slide E.

His a set-screw, by which the table is retained or fastened at any desired altitude.

The base A is provided with an opening, to admit the lower part of the slide E, and accommodate its vertical movement.

By means of this device the working-table, holding the article to be engraved, can be readily and accurately elevated and loweredthat is, adjusted relatively to the pantograph, to suit the various thicknesses of the articles to be operated upon-and when adjusted the The operation of this device is as follows:

The article or plate to be traced, of the same width as the form or tracing table, is placed thereon, and then the cam N is operated to elevate the table, and thus cause the edges of the tracing article to be pressed between the the form-table and the flanged side pieces, thus firmly retaining the same in position; or a flange may be turned on the tracing article to fit between the rear side of the form-table and the side piece K.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In a pantographic engraving machine, the combination, with a fixed pantograph-supthe flanged side pieces K K and vcam N, substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM S. WIGHT.

Witnesses:

JAMES NORTON, RoLLIN S. WEBB,

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