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Title: |
1893 Ad-Pratt & Whitney Co., Spencer's Automatic Screw Machine |
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Source: |
Pratt & Whitney Catalogue, 1893, pgs. 170-173 |
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Insert Date: |
10/31/2016 8:20:44 PM |
Automatic Screw Machines.
(SPENCER'S PATENT).
These machines are designed for making screws, studs, or other circular pieces of various outlines from a bar of round, square or hexagon metal. All the operations are wholly automatic, being controlled by a series of cams on a shaft running lengthwise of the machine in the lower part of the frame. These cams are adjustable, so that the length of stroke of turret-slide or of feed-tube or of cutoff slide can all be varied to suit size of screws to be made. The motion of the cam-shaft can also be made fast or slow, as may be desired for the tools when being brought to a position to do work, or when actually cutting. This variation is given by means of movable stops attached to a disc on the cam shaft, which ship the belt from one pulley to another. The tools are held in the revolving turret, which turns automatically when turret-slide reaches the end of its backward movement, thus bringing another tool into position to do its work. The work is held in a wire feed collet in spindle, which is driven by an open and crossed belt on two loose and one tight pulleys, thus giving reversing movements for tapping. This belt is shipped by means of a disc on cam-shaft having movable dogs, enabling the time of shipping to be varied as required. The cut-off slide is operated by means of a cam and levers, which are also adjustable to any length of stroke within the limits of machine. The special No. 3½, No. 4 and No. 5 machines are all made with back-gears on head. All the machines are placed in large pans, which catch all the oil and chips. No. 3½ machine is intended for light work on diameters larger than regular No. 3 takes. Special No. 3½ machine takes stock up to 3 1/16 inches, diameter, for light work; spindle being geared up from pulleys. All machines can be furnished with a turret cut-off arrangement, which consists of a turret which revolves automatically on cutoff slide and carries four tools. This is used for turning, forming and cutting off irregularly-shaped pieces.
Each machine is equipped with a pump, oil tank, dogs and cams. They will be furnished with tools for turret and cutoff rest, to order, for furnishing pieces of irregular outline and circular cross section to sample. Clamp cone pulleys, three grades, for main line shafting, making 100 to 150 revolutions per minute, are furnished to order for all machines up to No. 3½.
US Patent: 275,431 |
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1893 Hartford Machine Screw Co., Spencer's Automatic Screw Machine, #'s 1 & 3
1893 Hartford Machine Screw Co., Spencer's Automatic Screw Machine, #'s 4 & 5
1893 Hartford Machine Screw Co., Spencer's Automatic Screw Machine (Dimensions)
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