Patent GB-190603927-A (GB)
Title: A Machine for Testing and Indicating the Efficiency of Files.
Inventor: HERBERT EDWARD GEISLER
Filed: 1906-02-17
Granted: 1907-02-16
Abstract: 3927. Herbert, E. G., and Fletcher, C. Feb. 17. Files.-A machine for testing and automatically indicating the efficiency or quality of files, is constructedso that the file reciprocates against a test bar of standard section held against it ; the amount of metal removed before the file is worn out, the time taken to wear away the file, and the rate at which the file cuts are recorded on a drum &c. The file 40 is held between a holder 7, adjusted by a screw 8 if the file is tapered, to bring the working face parallel with the plane of movement and a screwthreaded tubular bush 5 with nut 6. The holder and bush are mounted on headstocks 3, 4 adjustably secured to a slide 2 which is reciprocated through a slotted arm 10, Fig. 2, operated by an adjustable stud 13 on a disk 12, which is rotated from the main shaft by a pinion 17, Fig. 3, and bevel-wheel 15. To prevent the file from chattering, a weight 51 supported on a rod 52 and having a screw 53 may be provided. The test bar 18, which moves on rollers 21, 19 and between guide-rollers 21 x, is pressed up against the file by any suitable means such as a chain 22 and wedged weight 23, and is moved out of contact with the file on the idle stroke by a cam 34 on the shaft 11, which contacts a bowl 33 on a lever 32 oscillating on a pivot 31. On this pivot also moves an arm 30, which presses on a screw 29 in a lever 28 normally pressed against a stop 35 by a spring 36 having a regulating-screw 37. This lever 28 has jaws 28<1> which normally loosely embrace the test bar, but when the arm 30 is moved the jaws bind on the bar and move it backwards. Any device that will move the test bar backwards and then free it may be used. The results are recorded on a drum 38, provided with ruled paper and rotated through speed-reducing gearing in a box 39 by a pawl and spring-pressed lever operated by the cam 34. The drum may be rotated continuously. The style, wheel, pencil holder 44, or similar device is carried by a rod 42 moved on the working stroke of the file by a block 45 fastened to the test bar and having a chain 47 passing round a pulley 48 on the rod and connected to the rod 39. The rod may have an extension against which the block bears or to which it is connected, or other means may be provided for feeding the style. When the test is longer than the sheet, a fresh sheet may be used and the drum set back after loosening the ring-nut 50. The bar may be held stationary and the file moved laterally for the idle stroke. Instead of a drum, a disk may be used, or a fixed dial and moving pointer operated by the bar to show the amount of metal filed away for a given number of strokes, which are recorded by a separate device. The filings are made to fall down a shoot 26 into the box 27. According to the Provisional Specification, the drum may be rotated by the action of the bar, and the pencil advanced by the movements of the file ; or the pencil may be stationary and the drum rotate and move longitudinally. The machine may be used to test the bar also, and the bar may be moved and the file stationary. The bar may be permanently stationary and the file moved clear on the idle stroke and laterally as the bar is filed away, and the file may be made to operate both drum and pencil or one only while the drum or pencil is moved by the main driving parts.