US748979A

US748979A - norrie

Info

Publication number: US748979A
Authority: US
Publication date: 1904-01-05
Anticipated expiration: 1921-01-05

Description

PATENTED JAN. 5, 1904.

R. NORRIE. PUNGHING AND SH-EARING MACHINE, &:o

APPLICATION FILED APR. 4. 1903.

3 SHEETS-SHEET 1.

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WITNESSES:

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PATENTED JAN. 5, 1904.

R. NORRIB, PUNGHING AND SHEARING MACHINE, 6w.

APPLICATION FILED APR. 4, 1908.

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PATENTED JAN. 5, 1904.

I RfNORRIE.

PUNGHING AND SHEARING MACHINE, 8m.

APPLICATION FILED APR. 4. 1903.

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:Rs cu, morouwu, wuummou n n UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

PUNCHING AND SHEARING MACHINE, 86c.

. SPECIFICATION forming part of Letters Patent No. 748,979, dated January 5, 1904.

Application filed April 4, 1903. serial No. 151.075- (No model.)

ject of His Majesty the Emperor of India, and

a resident of Rangoon, British Burma, India, have invented new and useful Improvements in Punching and Shearing Machines and the Like, of which the following is a full, clear,

and exact specification.

This invention relates to improvements in machines for cutting metal. In machines of this kind at present in use the cutting-surfaces are arranged somewhat in the form of a pair of scissors, which twist or bend the material being cut off and necessitate its being straightened out when the cutting operations are completed. They have also the defect that the machines are constructed in such a way that the working partsare above the level of the shear-blades and so often come in the way of the material being out. In OI'-, der to obviate this defect I have devised a special form of shears in which instead of only two cutting edges a blade works in between two other cutting edges, which has the effect of shearing out strips of the material being cut. This blade is mounted so as to enable the material being worked to pass on either side of it, which enables any length of cut to be made.

In order to better explain my invention, reference will be made to the accompanying drawings,illustrating one of the forms my invention may take, and in which similar nu mbers of reference designate like parts throughout, and in which- Figure 1 is a side elevation with certain parts removed. Fig. 2 is a plan with the lever-blade and table removed. Fig. 3 is an end elevation of Fig. 1. Fig. 4 is a section on line as a; of Fig. 1. Fig. 5 is an enlarged end view of the cutting-jaws. Fig. 6 is a section on line 2 z of same, and Fig. 7 is a sideelevation of the frame or lever 2 with the cutting-blade removed.

Referring tothe drawings,the cutting-blade 1 is of peculiar formation. Its cutting-surface is preferably concave in cross-section, as shown in Fig. 5 of the drawings, which I have found enables the blade to give a much cleaner cut or punch than the usual flat blade. The cutting-blade is secured by bolts to the to the upper of these checks 4 that theout ting-blade is secured. The positions in which these cheeks 4 and 5 are fixed or made onto the plate 3 are such as to allow of the metal sheet being cut passing along the cutting table without coming into contact with either of the cheeks.

The frame or lever 2 is pivoted at 6 on a bolt and is made to work up and down in a slot 7 on the cutting-table 8, at whose front end and corresponding with the cutting-blade 1 are two cutting-blades 9, set one on either side of the slot 7,and between which the blade 1 is made to force the metal being cut or punched out. These cuttingblades 9 are made so that their sides adjacent to the slot 7 are nearer each other at the top than at the bottom to allow the strip of metal being punched out to pass freely down andare supported by a suitable block 19,b0lted to cheekplates 20 and 21.

The lower edge of the frame or lever 2 and at such a distance from the pivotal front as to give the desired mechanical advantage comes in contact with a cam 10, Fig. 1, placed on shaft 11, the revolution of which causes that end of the frame or lever 2 to be alternately raised and lowered. As that end of frame rises the cutting-blade 1 passes downward between the cutting-blades 9 until when the cam 10 has raisedits end of the frame to its highest point the cutting stroke is complete, and as the frame falls back toits former position under the force of gravity the cutting-blade 1 returns to its original position ready for the next cutting stroke. The movement is shown by dotted lines in Fig. 1.

Motion is conveyed to the shaft 11 and its cam through a series of gear-wheels, which reduce the speed of the motive power (which may be applied in any convenient way)'to the desired extent; but I make no claim to the This arrangement of this gearing and any convenient form may be used. In the drawings I have shown a series of cog-wheels reducing the speed of the driving-pulley 12 on shaft 13 through gear-

wheels

14, 15, 16, and 17 to the desired extent in the shaft 11. A flywheel 22 may also be mounted on the driving-shaft. As a metal sheet is being cut through the strip being sheared or punched out is by the action of the blade 1 bent downward, and as the sheet is further fed into the machine this strip first comes into contact with the front of the lower check 5 of the frame, which is suitably curved, and later into contact with a guide 18, by which it is led out of the machine.

The whole of the working parts are mounted in and inclosed by a suitable frame, while the two cheek-plates 20 and 2l,between which the cam 10 and frame or lever 2 work, may be arranged so as to support the principal working parts, as shown in the drawings.

While the cutting-blade is shown in the present instance with one form of cutting edge, it will of course be evident that such edge may be formed in any preferred manner. The shape of the blade and the course of its stroke may be altered to enable it to punch out strips, if so desired.

Having now particularly described and ascertained the natureof my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a machine for punching and shearing metal or the like, the combination of a main frame, a frame or lever pivoted in said main frame, said pivoted frame having cheekpieces and being formed with a longitudinal groove or slot therein, a cutting-blade secured in the slotted portions of the frame, a cam mechanism for actuating the cutter, cutting edges mounted on the main frame adjacent to the path of travel of the first-mentioned cutting-blade, and a guide for the material severed by the blades.

2. In a machine for punching and shearing metal or the like, the combination of a main frame, a frame or lever pivoted in said main frame, strengthening cheek-pieces for said pivoted frame, said pivoted frame being formed with a longitudinal grooved or slotted portion, a cutting-blade secured within the slotted portion of such pivoted frame, the cutting edge of the blade being concaved, and stationary cutting-blades mounted on the frame adjacent to the path of the first-mentioned cutting-blade.

3. The combination of a main frame, a cutter-carrying frame or lever pivoted thereto, a cutting-blade riveted in the frame, such frame comprising a plate corresponding in thickness to the blade and extending rearward in astraight line with said blade, and strengtheningcheek-pieces riveted to the upper and lower ends of said plate; the cuttingblade being secured to the uppermost cheekpiece substantially as set forth.

4. The combination of a main frame, a cutter-carrying frame or lever pivoted thereto, a cutting-blade riveted in the frame, such frame comprising a plate corresponding in thickness to the blade and extending rearward in a straight line with said blade, strengthening cheek-pieces riveted to the upper and lower ends of said plate, stationary cutting edges mounted below the cuttingblade of the pivoted frame, and means for actuating said pivoted frame to cause the cutting-blade to pass between the lower stationary cutting edges.

In witness whereof I have hereunto set my hand in presence of two witnesses.

ROBERT NORRIE.

Witnesses:

H. G. REMFRY, H. H. REMFRY.