US1106683A - Electric web-drying machine. - Google Patents

Description

J. G. SHERMAN.

ELECTRIC WEB DRYING MACHINE.

APPLICATION lILED APR. 29, 1911. RENEWED JAN.8. 1914.

1,106,683. Patenteai Aug. 11, 1914.

tantra!) STATES PATENT OFFICE.

JQHN C. SHERMAN, OF BROOKLINE, MASSACIIUSETT$, ASSIGNOR TO HOWARD PAR-KER, OF BERLIN, NEW HAMPSHIRE.

ELECTRIC WEB-DRYING MACHINE.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed April 29, 1911, Serial No. 624,011. Renewed January 3, 1914. Serial No. 810,263.

To aZZ whom it may concern Be it known that 1, JOHN C. SHERMAN, a citizen of the United States, and a resident of Brookline, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Electric WVeb-Drying Machines, of which the following is a specification.

My invention relates generally to a machine for drying webs of material such as paper, pulp, textiles, etc., and particularly to a machine wherein the drying or heating effect is produced electrically.

As my invention as herein presented is not concerned withany particular embodiment, I have in the drawings provided a diagrammatic representation of the essential features of the invention.

In the manufacture of pulp, paper, textile fabrics and other materials which are made in long strips or Webs it is necessary or desirable to pass these webs around heated rollers in order to thoroughly dry the material. Heretofore these rollers have usually been heated by steam, 'a practice which is open to a number of serious objections.

My electrically operated heating or drying machine is made as follows: To the ends of the primarycore a, made preferably of soft iron laminations, are secured end frames Z)b having a plurality of arms 1-1, 2-2 and 3 -3 the outer ends of which are connected in pairs by secondary cores 0, c and 0 About the primary core (1- there is a primary winding (Z connected with any'suitablc source of alternating current. About the secondary cores 0, c, c are individual secondary windings in the form of copper tubes 0, c, (2 Each of these coils by the nature of its construction constitute closedor short circuited coils.

By properly exciting the primary winding (Z an induced electrical current is set up in the secondary windings c, 0, c and, owing to the fact that each of these second ary windings is short circuited, this current effect expresses itself in the form of heat. The extent of the heating efi'ect imparted to the secondary windings is determined by the cross sectional area of the secondary core and its length, the supporting arms 11-1, 2-2 and 3-3 for this purpose being considered as part of the core.

It is customary to use a considerable number of heating or drying drums in machines of this character and it will be clear that it is possible to control the heat in each drum by properly proportioning the cross sectional area of the various secondary cores to their length, with the result that all drums can be maintained at a substantially uniform temperature, or the temperature can be varled as desired.

As the limits of machine designed would not in all cases permit of the control of the temperature of the drum by varying the cross sectional area and length of the cores, I contemplate providing each secondary core with an auxiliary primary winding indicated at f, f, f controlled by a proper switch so that it can be provided with a current to either augment or oppose the current in the principal primary winding depending upon whether it flows in the same or in an opposite direction with the result that the temperature of any given secondary Winding or drum can be varied at the will of the machine attendant to suit any condition. Preferably the. secondary windings which take the form of tubular drums are rotatably mounted on the secondary cores.

I do not wish to be understood as limiting myself to any minor details of construction which may have been illustrated or herein above described. The invention, as it is herein broadly and generally described is, I am aware susceptible of embodiment in vari ous forms.

I claim as my invention:

1. In a heating and drying machine a nonrotatable magnetic core, a primary winding in one part thereof connected with a source of electrical energy and a secondary coil in the form of a tubular drum rotatably mounted upon said core.

2. In a heating and drying machine a non-rotatable magnetic core divided in part into a plurality of branches, a primary coil mounted'on the undivided portion of said core and connected with a source of electrical energy, and short circuited secondary coils of tubular form mounted upon said branches.

3. In a heating and drying machine a non-rotatable magnetic core divided in part into a plurality of branches, at primary coil mounted on the undivided portion of said core and connected with a source of electrical energy short oircuited secondary coils of tubular form rotatably mounted on said branches, and auxiliary primary coils on the branches of said core.

7 4. In a heating and drylng machine a non-rotatable magnetic core divided in part into a plurality of branches, a primary coil mounted on the undivided portion of said core and connected with a source of electrical energy, a short circuit-ed winding in the form of a tubular drum on each of said branches, and means for varying the inductive efi'ect between said core and szi-id short circuited s'econdarywindings.

| the primary 5. In a heating and drying), machine, a -on rotatable magnetic core comprsing a olid DIimf-lj section and a plum secondary sections, a primary WiIlQ o i on section, and short circnitcd windings 1n the form of tubular drums on each secondary section.

J UHN G. SHERBLLXN.

Witnesses:

PERCY W. FULLER, Tnos. H. SHERMAN.

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