US2238542A - Shear - Google Patents

Description

April 15, 1941. *l l H, H ALBo-r v 2,238,542

' sumti I Fired Aug. 3, 1940 WITNEJJE mesas Apr. is, mi

nom n. what, mutuels ra., mimmso' United Engineering and Foundry Company.

Pittsburgh, Pa., a corporation of Pennsylvania application August a, 1940, serial No.Y 350,321

`'iz claims.

This invention relates to flying shears for severing, strip material into predetermined lengths,

and more particularly to shears of this character of the rotary type. l,

The desideratum. in the operation ,of flying( shears of this type is to produce the cuts with the blade carriers or drums rotating at a uniform speed and thus avoid constant acceleration and deceleration. To obtain this, if the strip is to be cut into relatively short lengths 'the drunsmustbe of Asmall diameter. On. the other hand, it is .usually necessary to shear the strip into pieces of different lengths, and todo so by varying the rotational velocity of the drums during every revolution. This increases the strain on the entire apparatus. To h'old this strain as low as possible it is again ldesirable to use drums of relatively small diameter so that there' isnot so much inertia to overcome. In either case, if the strip is wide the long drums of "small diameter are likely toA be bowed or 'deiiected out of line when the blades carried thereby strike the strip. This, of course, prevents proper shearing.

It is among the objects of this invention to pro vide a rotary type, flying shear in which the blade carrying drums are of small diameter compared with their length but are prevented from bending f my flying shear, partly broken away to show the f backing roll mounting; Fig. 2 is a 'vertical s'ec- .during shearing, in which the impact of shearing is transmitted to the'v shear frame principally through means other than the bearings of the'. drums, andnin which the rotational velocity ofthe.

`drums can be accelerated andvdeceleratedl between cuts without placing undue strain on the` apparatus. l

In accordance with this -invention a ipair/of blade carriers, such as superimposed drums, are

'thef drums make one revolution.v lengthsare caught by a beltvconveyor 9 and carf` tion taken on the line II--II of Fig. l; and Fig.

3 is a view similar to.` Fig. vl showing in full the 'shear drive and a modified drive yfor the backing rolls.

Referring to Figs. l and 2 of ,the drawing, a pair of drums I'are journaled at their endsin superimposed relation in the sides of a housing 2. The drums are spaced far enough apart to 'permit metal strip to be continuously fed between them from a guide I leading trompa roller leveler or other apparatus. The lower drum is driven in the same manner as the embodiment in- Fig. -3 through an adjustable accelerating mechanism {(Fig. 3), such as shown in my Patent No.

y2,i.l6'1.,5l3, from the shaft 5 of a motor 6.

Mounted on the outer ends of the drum necks at the opposite vside of the housing are gears 1 which mesh' with each other so that the two drums rotate in unison. Extending lengthwise of each drum and suitably attached thereto is a shear blade 8. The two blades in this embodiment are mounted on the drums in such positions that they cooperate in shearing the strip every time The sheared ried away to be piled.

It is a feature of this invention that although the drums Ahave diameters which are small enough in yconriparison.with their lengths to permit the drums and bladesv to bow away from the strip yrotatably mounted in aframe in such manner that strip material can pass between them, and

they carryshear'blades whichfcooperate in periodically severing the lmoving strip. Although the drums are long andl narrow, they are prevented during the shear cuts, they are prevented from l doingthis. Accordingly,l the drums are supported vbybacllring means which prevent them from being deflected in this manner. Preferably, the backing means comprise a pair of short rolls il adapted `to engage ythe central portion of each drum ron both sides oi` the vertical center line ofthe pass from bending at the time of cutting by backing rolls. These backing rolls are provided with re, n

cesses `extending across their faces for receiving the blades while they are passing the rolls. The rolls may engage the drums at all timeabut it is preferred that the faces of the rolls be spaced from the 'drums and be provided with projecting wear-resisting inserts which engage the vdrumsonly during the cut. The backing rolls may be Y so as to prevent the drum from'beingvdeflected vertically or horizontally. Each roll is rotatably mounted in a frame .I2 which is mounted in the housing for .sliding ladjustment transversely -oi the drums on the side opposite to the/pass, and can be moved inwardly by an adjusting screw I3 in order to` compensate forwear and to vary the pressure on the adjoining drum. Although the ,'rollsv lmay be. made to engagethe drums at'all .I times, friction` and wear can be reduced if they driven either at a uniform speed, or at a varying` velocity in accordance with the variable Vdrive of the drums.

The invention is illustrated in the accompanyare spaced from the drums and only engage them during the shear cuts. Forl this purpose the rolls are provided `with projections which are preferably in the form of hardened contact members vil inserted in the roll faces across which they y extend. Likewise, f the central portions of the drums may be provided with similar hardened 'inserts I5 for engaging contact members I4. 'Ihe various inserts are so positioned circumferentially of the, rolls and drums relative to the shear blades that inserts I4 engage inserts I5 only at the time of a cut, at which time they take the shock of the shearing impact and thus protect the rolls and drums. This impact is transmitted to the shear housing principally through the backing rolls, rather than through the drum necks. The rest of the time the drums and rolls are free of each other. The hardened inserts also take the wear and can be replaced when worn without having to replace the drums and rolls.

To prevent the shear blades from interfering with the rotation of the drums, in case the backing rolls are not spaced far enough from the drums to clear the blades, the rolls are provided with recesses I6 extending across their faces for receiving the blades as they pass the rolls. Registering of the blades and recesses, as well as engagement of inserts I4 and I5, is assured by connecting a shaft I1 to each backing roll and driving it from its outer end by a gear I8 meshing with one of the gears] on the drums. If the velocity kof the drums is varied during each revolution by mechanism 4 (Fig. 3) the velocity of the rolls is varied in synchronism therewith. f

the hardened inserts to project from the rolls and drums.

On the other hand, acceleration and deceleration of the rolls can be avoided, as shown in Fig. 3, by driving them at a uniform speed through shafts 2| carrying gears 22 on-their outer ends. These gears are Journaled in a gear case 23 through which drive shaft 5 extends. Rigldly mounted on the drive shaft is a gear 24 that drives the lower pair of gears 22 at a uniform speed, and that also drives an idler gear 25 journaled in the gear case where it meshes with the upper pair of gears 22. As the drums may be rotating at a higher xspeed than the backing rolls at the time that the shear blades pass the rolls, it may be found desirable to provide the rolls with wider7blade-receiving recesses than in the ilrst embodiment. Hardened inserts I4 and I5 (Fig. 2) are of especial importance in the embodiment of Fig. 3 in which the drums and backing rolls rotate at different speeds during at least part of every revolution. 'Ihisl would cause slippage and wear between them, but,the projecting rhardened inserts reduce this to a minimum, or

eliminate it entirely if the rolls and drums are rotating at the `same speeds during the cut.

According to the provisions of the patent statutes, I have explained the principle and construction of my invention and have illustrated and described what I now consider to represent its best embodiment. 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 ying shear comprising a pair of rotatably mounted blade carriers between which strip material is adapted to pass, a pair of shear blades mounted on the rotating carriers for periodically severing said strip, and means for backing up said carriers against deflection at the time of shearing.

2. A flying shear comprising a pair of rotatably mounted superimposed blade carriers between which strip material is adapted to pass, a pair of course, it is not necessary in this embodiment for shear blades mounted on the rotating carriers for periodically severing said strip, and backing rolls for supporting said carriers against bending at the time of shearing.

3. A flying shear comprising a pair of rotatably mounted superimposed drums between which strip material is adapted to pass, a pair of shear blades carried by the rotating drums for periodically severing said strip, and a pair of backing rolls engaging each drum at circumferentially spaced points on the drum at the time of shearing.

4. A flying shear comprising a pair of rotatably mounted superimposed blade carriers between which strip material is adapted to pass, a pair of shear bladesl carried by the rotating carriers for periodically severing said strip, backing rolls engaging said carriers at the time of shearing, each of said rolls being provided with a recess extending longitudinally across its face for receiving the shear blade attached to the adjoining carrier as the blade is carried past the roll, and means synchronizing the rotation of the carriers and rolls so that said recesses always receive said blades while the blades are passing the rolls. v

5. A flying shear comprising a pair of rotatably mounted superimposed drums between which strip material is adapted to pass, a pair of shear blades carried by the rotating drums for periodically severing said strip, backing rolls for said drums for supporting them against bending at the time of shearing, and hardened contact members connected to said rolls and drums in such positions that they engage each other at the time of shearing and transmit the shearing impact from the drums to the rolls.

6. A flying shear comprising a pair of rotatably mounted superimposed drums between which strip material is adapted to pass, a pair of shear blades carried by the rotating drums for periodically severing said strip, backing rolls for said drums for supporting them against bending at the time of shearing, and hardened contact members connected to said rolls and drums in such positions that they engage each other at the time of shearing and transmit the shearing impact from the drums to the rolls, the faces of said rolls and drums being out of contact with one another.

7. A flying shear comprising a pair of rotatably mounted superimposed drums between which strip material is adapted to pass,a pair of shear blades carried by the rotating drums for periodically severing said strip, backing rolls for said drums for supporting them against bending at the time of shearing, and hardened contact members connected to said rolls and drums in such positions that they engage each other at the time of shearing and transmit the shearing impact from the drums to the rolls, the hardened members of said rolls projecting from the faces thereof whereby those faces are spaced from the drum faces.

8. A flying shear comprising a pair of rotatably mounted superimposed blade carriers between which strip material is adapted to pass continuously, a pair of shear blades mounted on the rotating carriers for periodically severing said strip, means for driving said carriers at velocities varying during each revolution, backing rolls for said carriers on the sides opposite to the strip, and means for driving said rolls at a uniform speed.

9. A flying shear comprising a pair of rotatably mounted superimposed blade carriers between which strip material is adapted to pass continuously, a pair of shear blades carried by the rotating carriers for periodically severing said strip, means for driving said carriers 'atvvelocities varying during each revolution, backing rolls for said carriers on the sides opposite to the strip, 'and means for driving said ro1ls` at the same varying velocities as the blade carriers.

10. A flying shear comprising a pair of rotatably mounted superimposed blade carriers between which strip material is adapted to pass continuously, a pair of shear blades carriedby the rotating carriers for periodically severing said strip. means for driving said carriers at .veloci ties varying during each revolution, backing rolls for said carriers on the sides opposite to the strip,

and means gearing the rolls directly to the carlriers -sol that the rolls are driven by the blade carriers. y

11. A iiying shear comprising a pair of rotatably-mounted superimposed blade carriers be tween which strip material is adapted to pass, a

plurality of cooperating shear blades carried by the rotating carriers for periodically severing said strip. `ba'clringrolls engaging said carriers. each of said rolls being provided with a plurality of recesses extendinglongitudinally across its face for receiving the shear blades attached to the adjoining carrier as the blades are carried past the roll, and means synchronizing the rotation of the carriers and rolls so that said recesses always receive said blades while the blades are passing the rolls.

12. A ying shear comprising a pair of rotatably-mounted superimposed drums between which strip material is adapted to pass, a pair of shear blades carried bythe rotatingv drums for periodically severing said strip, a pair of backing rolls engaging each drum at circumferentiallyspaced points and each of said-rolls being provided with a recess extending longitudinally across its face for receiving `the shear blade attached to the adjoining carrier as the blade is carried past the roll.

, HOWARD H. TALBOT.

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