US596268A

US596268A - Polishing-roll for photographic burnishers

Info

Publication number: US596268A
Authority: US
Publication date: 1897-12-28
Anticipated expiration: 1914-12-28

Description

(No Model;)

A. H. HUMPHREY.

POLISHING ROLL FOB PHOTOGRAPHIG BURNISHERS. No. 596,268. Patented Dec. 28,1897.

WITNESSES: INVENTOI? m: Momma versus cu. PNOTO-LITNO. wAsuwnYom-o. c

UNITED STATES PATENT OFFICE.

ALFRED H. HUMPHREY, OF KALAMAZOO, MICHIGAN.

POLISHING-ROLL FOR PHGTGGRAPHEQ BURNISHERS.

SPECIFTCATION forming part of Letters Fatent No. 596,268, dated December 28, 1897.

Application filed January '7, l 892.

To all whom it may concern..-

Be it known that I, ALFRED l-I. l-IUMPHEEY, a citizen of the United States, residing at Kalamazoo, in the county of Kalamazoo and State of Michigan, have in vented certain new and useful Improvements in the Manufacture of Hollow Polishing-Rolls for Photographic Burnishing-Machines, of which the following is a specification.

My invention has for its object the production of a hollow roll for a photographic burnishing machine which shall be of light Weight, uniform thickness, and the polishingsurface of which shall be dense and smooth.

Heretofore in this class of machines the rolls have been made from cast metal, and, as is well known, the surface of a piece of cast metal invariably contains a greater or less number of sand-holes and is necessarily rough and uneven andalso more or less porous. Again, in casting a hollow roll it is practically an impossibility to get the shell of uniform thickness. This irregularity in the thickness causes the roll to become heated much more quickly in one part than another, and in this class of work it is absolutely necessary that a uniform heat be maintained throughout the entire polishing-surface of the roll. Again, in this class of machinery the rolls are necessarily very close together, and the irregularity in the thickness of the roll, and the consequent heating of one part more quickly than another, prevents a uniform contraction and expansion, and consequently the roll is very often warped and pressed out of shape by contact with the other roll. Again, the cast roll must, in order to have the requisite strength, have its shell cast with a greater or less amount of metal in it, and as the heat must be applied to the interior of the roll the interior diameter of the roll cannot be reduced beyond a certain point, although it is desirable to have the exterior diameter as small as possible. To obviate these various difficulties, I make the roll of wrought metal, such as awrought-iron pipe or tube or steel pipe or tube. This enables me to obtain a hollow roll with an extremely thin shell and at the same time one which is absolutely uniform in its thickness.

The metal composing it is much more dense Serial No- 41'7,321. (N0 model) and smoother than the cast metal, while the interior diameter remains the same.

In the drawings, Figure 1 is a side elevation of my roll and a portion in section and without the orifices at the end. Fig. 2 is a side elevation showing the orifice for the admission of air to the interior of the roll. Fig. 3 is an end elevation.

In carrying out the invention, A represents a tube of the desired diameter. This tube is first swaged, rolled, or otherwise treated to reduce its ends, as shown at a, to form spindles for the roll. After this rolling or swaging process, if desired, the roll may be struck by suitably-shaped dies to bring it to the requisite form.

I would have it understood that the process whereby the ends of the rolls are reduced to form the spindles is immaterial, the essential feature being to have the entire roll and spindles formed of a single piece of wrought metal. After the spindles have been formed the orifices a may be drilled or otherwise formed in the beveled or tapered ends of the roll, as shown in Figs. 2 and 3. The polishing-surface of the roll is then smoothed and polished to the necessary degree.

It will thus be observed that by forming the rolls and spindles of a single piece of wrought metal I have obtained a roll with a shell that is comparatively thin, and consequently one that can be readily heated from the interior, one which will heat uniformly throughout its polishing-surface, one which is of light weight, one in which the expansion and contraction of the metal will be uniform throughout, and one having a perfectly smooth and dense polishing-surface.

What I claim is In a polishing-roll for photographic burnishing-machines consisting of a tube provided 011 each end with a spindle or a journal containing apertures 011 the shouldered portion between the journal and the roll; said tube and spindle being made of a single piece of wrought metal substantially as described.

ALFRED H. HUMPl-IREY.

Witnesses:

EDWIN W. DE Yon, SAMUEL S. SKINNEE.