US2261007A

US2261007A - Reciprocating flying shear

Info

Publication number: US2261007A
Application number: US365049A
Authority: US
Inventors: Howard H Talbot
Original assignee: United Engineering and Foundry Co
Current assignee: United Engineering and Foundry Co
Priority date: 1940-11-09
Filing date: 1940-11-09
Publication date: 1941-10-28
Anticipated expiration: 1958-10-28

Description

Oct. 28, 1941. TALBOT 2,261,007

RECIPROCATING FLYING SHEAR Filed Nov. 9, 1940 2 Sheets-Sheet 2 INV ENT OR.

' WW y-5M4 ATTORNEYS.

Patented Oct. 28, 1941 UNITED STATES PATENT OFFICE RECIPROCATING FLYING SHEAR Howard H. Talbot, Pittsburgh, Pa., assignor to United Engineering and Foundry Company, Pittsburgh, Pa., a corporation of Pennsylvania Application November 9, 1940, Serial No. 365,049

9 Claims.

This invention relates to reciprocating flying shears, and more particularly to those capable of missing cuts when desired so as to vary the length of the sheets cut from a strip.

In reciprocating flying shears of this character known heretofore the blades are reciprocated by eccentrics, used herein as abroad term to cover cranks as well, which are rotatable relative to each other to permit cuts to be missed. For this purpose the eccentric that operates the lower blade usually rotates around the eccentric that reciprocates the upper blade, in which case the upper blade, as it is moved back and forth in the path of the strip, travels inan oval path. on the other hand, although the lower blade travels forward during a cutting stroke in a curve substantially the same as the upper blade, on the back stroke it travels in a path similar in shape to its forward path but slightly below it. Without an abnormally great eccentric throw it is diflicult to obtain sufficient clearance between the strip and the bottom blade on its back stroke to avoid striking the overhanging end of the oncoming strip and thereby scratching it.

Also, when the strip is fed into the shear for 2.

the first crop cut the blades may be moving through their back stroke, whereby the lower blade may strike the strip end overhanging the entering guide and cause a cobble.

It is among the objects of this invention to provide a reciprocating flying shear in which both blades always travel in paths that assure adequate clearance between the blades and the strip during backstrokes, in which miscuts can be effected without affecting the basic type of blade paths, and in which the miscut conditions are controlled in a relatively simple manner.

In accordance with this invention a movable frame carries a fixed blade and a movable blade. A pair of eccentrics, which are rigidly mounted relative to each other but are rotatable on a common axis, are operatively connected to the frame and movable blade in order to reciprocate the blades. The frame is oscillated in the path of travel of the strip material passing through the shear so that the strip will be out without tearing or buckling. To permit cuts to be missed. the movable blade is connected to one of the eccentrics through the medium of an adjustable eccentric rotatably mounted on the first-mentioned eccentric. The position of the adjustable eccentric relative to its supporting eccentric at the center of each forward stroke of the blades determines whether the blades will make or miss a cut.

illustrated in the accompanying drawings in which Fig. 1 is an end view, partly in' section, of my shear; Fig. 2 is a vertical section taken on the line II-II of Fig. 1; Fig. 3 is a horizontal section taken on the line III-III of Fig. 1 and showing the shear drive in plan; Fig. 4 is a fragmentary vertical section taken on the line IV--IV of Fig. 1; Fig. 5 is a..view, similar to Fig. 4,of the main eccentrics rotated 180; Fig. 6 is a fragmentary vertical section taken on the line VIVI of Fig. land showing the adjustable eccentric rotated 90 relative to the position of the eccentrics shown in Fig. 4; and Figs. 7 and 8 are views similar to Fig. 6, but with the gearing omitted, showing the adjustable eccentric in two other positions relative to the main eccentrics.

Referring to Figs. 1, 2 and 3 of the drawings,

a horizontal shaft I has offset end portions that are joumaled in a pair of pedestal bearings 2. The central portion of the shaft thus forms a crank or eccentric, and between this portion and each pedestal 2 the shaft is provided integrally with an eccentric 3 that isrotatably mounted in the lower end of one of the end posts 4 of a'shear frame 5. Rigidly connected to the frame between its end posts is a top shear blade 6 which is moved up and down by the frame when eccentrics 3 revolve. The inner faces of end posts 4 are provided with longitudinally extending recesses l in which the ends of a movable cross beam 8 are slidably mounted. This beam, which carries a bottom shear blade 9, is

pivotally connected near its ends to links H the lower ends of which are operatively connected to the onset central portion of shaft I. As the axis of the central portion of the shaft and the axis of eccentrics 3 are on opposite sides of the axis of the shafts offset end portions, it follows that cross beam 8 is moved upwardly as frame 5 is moved downwardly, whereby the blades come together and shear into predetermined lengths the strip material that is continuously fed between them from the exit guides [2 of a roller leveler I3 or the like.

As shown in Fig. 3, shaft l is driven at any desired speed from a drive shaft I5 that is driven from an electric motor l6 through a suitable speed-changing unit II, pinion l8, gear I9, pinion 20. and gear 2| mounted on shaft l5. To cause the blades to move forward at the same speed as the strip during each cut so that it will not buckle, shear frame 5 is oscillated around its supporting eccentrics 3 and is also held upright by means of links 22 pivotally connected to The preferred embodiment of the invention is bosses 23 projecting outwardly from the frames side posts. The opposite ends of these links are pivotally connected to crank arms 24 projecting .radially from a shaft 25 that is journaled in a pair of pedestal bearings 26 in front of the shear frame. This shaft supports between its bearings a drum 21 around which conveyor belts 28 extend for carrying sheets away from the shear. Shaft 25 is driven from pinion 20 by a gear 29 and an accelerating mechanism 30 (Fig. 3), such as shown in my Patent No. 1,973,515, that is adjustable to cause the blades to move forward at the same speed as the strip at the moment each cut occurs.

Due to the oscillation of the shear frame and to the fact that the eccentric central portion of shaft l is always disposed, in effect 180 from eccentrics 3, both blades always travel in substantially oval paths as shown in broken lines in Fig. 2, whereby they are widely separated during their back strokes and therefore cannot strike the strip material at that time. The position of the main eccentrics when the blades are shearing on their forward stroke is shown in Figs. 1, 2 and 4 while their position when the blades are separated at the half-way point on the return stroke is shown in Fig. 5.

Another feature of this invention is that the blades can be caused to miss cuts without altering their basic oval paths. Accordingly, the links II that reciprocate cross beam 8 in frame are not rotatably mounted directly on shaft I, but on eccentric portions 36 of a sleeve 31 that is rotatably mounted on the offset central portion of the shaft. To control the position of this sleeve relative to shaft I, it is encircled between its ends by integral gear teeth 38 that mesh with the interior teeth 39 of a surrounding ring gear 40. This gear is rotatably mounted in a housing 4| in which there is a pinion 42 that meshes with the exterior teeth 43 of the gear. The pinion is mounted on a shaft 44 that is driven at selected speeds from drive shaft l5 by means of change speed gearing 45 (Fig. 3).

In order to shear during every forward stroke of the blades, shaft 44 is driven at such a speed that auxiliary eccentrics 36 always poin upwardly, as shown in Fig. 4, when the blades are at the mid-point of their forward stroke. This results in the blades passing each other willciently to shear the strip material between them. On the other hand, if it is desired to miss cuts, the speed of ring gear 40 is changed so that auxiliary eccentrics 36 will not point upwardly at the time a cut otherwise would take place. For example, to make a cut during every fourth forward stroke only, the auxiliary eccentrics are rotated around the eccentric central portion of shaft I at such a rate that each successive time statutes, I have explained the principle and modeof operation of my invention and have illustrated. and described what I now consider to represent its best embodiments. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

1. A flying shearcomprising amovable frame,

'a blade rigidly mounted thereon, a blade carrier mounted for-guided movement in said frame, a

second blade secured to said carrier, a pair of eccentrics rigidly mounted relative to each other that portion of the shaft comes into its upper to cooperate with the upper blade and make a cut, but on the next or fourth cycle or forward stroke of the blades the auxiliary eccentrics will be back in the Fig. 4 position and a cut will be made.

and rotatable on a 'common axis, an adjustable eccentric rotatably mounted on one of said eccentrics, means operatively connecting the other eccentric and the adjustable eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, and means controlling the position of said adjustable eccentric relative to the eccentric supporting it for varying the frequency of the cuts made by the blades whereby to vary the length of the sheets cut from said strip material.

2. A flying shear comprising a movable frame, a blade rigidly mounted thereon, a blade carrier mounted for guided movement in said frame, a second blade secured to said carrier, a pair of eccentrics rigidly mounted relative to each other and rotatable on a common axis, an adjustable eccentric rotatably mounted on one of said eccentrics, means operatively connecting the other eccentric and the adjustable eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, and means for constantly rotating said adjutable eccentric on the eccentric supporting it to cause said blades to periodically miss cuts.

3. A flying shear comprising a movable frame, a blade rigidly mounted thereon, a blade carrier mounted for guided movement in said frame, a second blade secured to said carrier, a pair of eccentrics rigidly mounted relative to each other and rotatable on a common axis, means for rotating said eccentrics around said axis, an adjustable eccentric rotatably mounted on one of said eccentrics, means operatively connecting the other eccentric and the adjustable eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, and means variable in speed relative to said eccentric-rotating means for rotating said adjustable eccentric around the eccentric supporting it to cause said blades to periodically miss cuts.

It will be noted that during every back stroke 4. A flying shear comprising a movable frame,

a blade rigidly mounted thereon, a blade carrier mounted for guided movement in said frame, a second blade secured to said carrier, a pair of laterally spaced eccentrics rotatable on a common axis, a shaft rigidly connecting said eccentrics and having its axis eccentric to said common axis, an adjustable eccentric rotatably mounted on said shaft, means operatively connecting said pair of eccentrics and said adjustable eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, and means controlling the position of said adjustable eccentric relative to said shaft for varying the frequency of the cuts made by the blades whereby to vary the length of the sheets cut from said strip material.

5. A flying shear comprising a movable frame, a blade rigidly mounted thereon, a blade carrier mounted for guided movementin said frame, a second blade secured to said carrier, a pair of laterally spaced eccentrics rotatable on a common axis, a shaft rigidly connecting said eccentrics and having its axis eccentric to said common axis, a sleeve rotatably mounted on said shaft and provided with an eccentric portion, means operatively connecting said pair of eccentrics and said sleeve eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, and means controlling the position of said sleeve relative to said shaft for varying the frequency of the cuts made by the blades whereby to vary the length of the sheets cut from said strip material.

6. A flying shear comprising a movable frame, a blade rigidly mounted thereon, a blade carrier mounted for guided movement in said frame, a second blade secured to said carrier, a pair of laterally spaced eccentrics rotatable on a common axis, a shaft rigidly connecting said eccentrics and having its axis eccentric to said common axis, a sleeve rotatably mounted on said shaft and provided with an eccentric portion, means operatively connecting said pair of eccentrics and said sleeve eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to out strip material passing between them, means for oscillating the frame in the path of travel of said strip material, a pinion mounted on the sleeve, and variable speed means driving said pinion for constantly rotating the sleeve on the shaft to cause said blades to, periodically miss cuts.

7. A flying shear comprising a movable frame, a blade rigidly mounted thereon, a blade carrier mounted for guided movement in said frame, a second blade secured to said carrier, a pair of laterally spaced eccentrics rotatable on a common axis, a shaft rigidly connecting said eccentrics and having its axis eccentric to said common axis, a sleeve rotatably mounted on said shaft and provided with an eccentric portion, means operatively connecting said pair of eccentrics and said sleeve eccentric to said frame and movable blade carrier for reciprocating the blades toward and away from each other to cut strip material passing between them, means for oscillating the frame in the path of travel of said strip material, a pinion mounted on the sleeve, 9. ring gear surrounding the sleeve and meshing with said pinion, and means for driving said gear to vary the position of said sleeve relative to the shaft.

8. A flying shear for cutting material in motion comprising a pivotally mounted frame equipped with a cutting edge, a carrier mounted for guided movement in said frame and equipped with a cutting edge disposed to cooperate with said first-mentioned edge, means for reciprocating said frame about its center of rotation so as to cause said cutting edges to travel back and forth in the general plane of travel of the strip to be severed, eccentric means for reciprocating said frame transversely of the travel of the strip. eccentric means for reciprocating said carrier relativeto said frame and transversely of the travel of the strip whereby to cause the cutting edge carried thereby to cooperate with the framecarried cutting edge to produce cuts, a second eccentric rotatably mounted on the carrier-actuating eccentric and interposed between the carrier-actuating eccentric and the carrier, and means for independently actuating said interposed eccentric.

9. A flying shear according to claim 8 in which the means for independently actuating the interposed eccentrics is adapted to so control the movement of the carrier as to determine the cutting cycle with respect to the reciprocations of the oscillated frame.

HOWARD n. TALBOT.