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Title: |
1894 Article-E. W. Bliss Co., #74 Long-Stroke Reducing Press |
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Source: |
Industry Magazine, Feb 1894, pg. 102 |
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Insert Date: |
12/6/2012 9:46:59 PM |
The annexed cut shows a long-stroke press recently designed by the E. W. Bliss Company, for re-drawing, shaping, trimming and other operations on deep sheet-metal articles. It is provided with a screw adjustment for the table, which permits the use of dies varying greatly in height, and also has an eccentric device in the link, which facilitates making the finer adjustments required for the dies. The press is provided with an automatic clutch controlled by foot power, so as to have the slide stop automatically at the top of the stroke, unless continuous strokes are wanted, in which case the foot is kept on the treadle. The machine is made with or without gearing. For broaching castings or forgings, where a very slow movement is required, the machine is arranged with gearing or more power than as shown, in which case a friction clutch on the driving shaft is used instead of an automatic clutch on the crankshaft. The press, as shown in the drawing, weighs about 8,200 pounds, has a maximum distance between the bed and slide of 15½ inches, and 10 inches of adjustment for this space, with a stroke up to 8 inches. The ratio of gearing, as shown, is 1 to 7½, and the number of strokes usually made per minute, 40.
Taking it all in all, no branch of machine-tool work is more perfect than presses. The uniformity of their functions, with simple direct strains, has led to a distribution of metal in the frames, and proportions for parts, that are quite settled, and happily so. The "architectural" designer has little chance on a press frame. There is no place for entablatures, cornices, mouldings, panels or carving, but in some of the very oldest types, long since gone, the designer would work in a doric-fluted column, and patch the working parts on one side.
The E. W. Bliss Company seem to have got down to logical design, and have even discarded the serpentine legs for support, with chromatic embellishment on all available surfaces, that constant exponent of bad fitting. |
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1894 E. W. Bliss Co., #74 Long-Stroke Reducing Press
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