US2127002A - Shearing device - Google Patents

Description

Aug. 16, 1938. D. R. MURPHY SHEARING DEVICE Filed Nov. 11, 1937 2 Sheets-sheaf, l

' INVENTOR DAN R. MURPHK wq'm ATTORNEYS.

Aug. 16, 1938. D. R. MURPHY SHEARING DIEVICE Filed Ndv. 11, 1957 2 Sheets-Sheet 2 INVENTOR. 174 R. MUIPPHK ATTORN EYS.

Patented Aug. 16, 1938 UNITED STATES SHEARING DEVICE Dan R. Murphy, ,Middletown,

The American Rolling Mill town, Ohio, a corporation of Ohio, assignor to Company, Middle- Ohio Application November 11, 1937, Serial No. 174,093

10 Claims.

My invention relates to shearing devices for shearing what are referred to in the trade as circles from square blanks, and more particularly it relates to an attachment which may be added to a conventional rotary shearing device for the purpose of enabling such devices to cut perfect circles.

In the cutting of circles from square blanks. it is, of course, necessary to get the cutting edges onto the proper line of cut, which may be a slight distance from the edge of the blank. In the past. this has been done in one of two ways; either the cooperating cutting edges of the shear have been separated and the blank inserted therebetween and the cutting edges then brought together on the line of cut, or the blank was simply shoved against the cutting elements, which then cut into the desired line of cut from the edge of the blank.

Both of these alternatives have disadvantages. The operation of opening the cutting elements to admit the blank is relatively slow and consumes valuable time, while if the. other alternative is used. the finished circle is not truly circular, but has a slight flat place adjacent the point where the line of cut passes to'the proper circumference of the circle.

With the above difiiculties in mind, it is an object of my invention to provide a device which is extremely simple and relatively cheap to manufacture, which will permit the cutting of perfect circles from square blanks.

It is a further object of my invention to provide such devices which may be attached to a conventional rotary shear without d fllculty.

Another obiect of my invention is the provision of a device as above outlined. which will cut circles from square blanks without leaving a fiat place on the circumference and without increasing the time of the operation.

These and other objects of my invention which will be apparent to one skilled in the art upon reading these specifications, or which will be pointed out hereinafter. I accomplish by that certain construction and arrangements of parts of which I shall now describe an exemplary embodiment.

Reference is made to the drawings forming a part hereof and in which:

Figure 1 is a plan view of a blank shown in its relation to a clamping element, a side stop, and cutting element.

Fig. 2 is an elevational view of a rotary shear embodying my invention.

Fig. 3 is a detailed cross sectional view on an enlarged scale of that part of Fig. 2 to which my invention particularly relates.

-Referring now to Fig. 2, I have shown somewhat diagrammatically a more or less conventional rotary shear comprising a frame 30, having a base extension M. The frame 30 carries the parallel shafts 3 and 4, which, respectively, carry the rotary knives 5 and 6. The shafts 3 and It may or may not be geared together, as desired. A pulley l is provided on the shaft 3 for driving the same from any suitable source of power. In view of the fact that it may be necessary to bring the knives 5 and t closer together as they become worn, the shaft 3 is provided with a pivoted bearing indicated generally at 9. A screw, provided with a handle indicated generally at 3, is provided for the purpose of raising and lowering the right hand end of the shaft 31. For the purpose of providing for relative axial adjustment of the knives, the shaft e is provided with clamping nuts indicated generally at I and ii, cooperating with a portion of the frame 30, whereby the knife 6 may be moved toward the right or left with respect to the knife 5.

Mounted in ways in a conventional manner upon the base extension it is a table l2. The table i2 is provided with a nut i5, adapted to cooperate with a threaded portion of the shaft M. The shaft it may be turned by means of a handwheel it for the purpose of adjusting the position of the table E2 on the base 36 with respect to the knives and 6.

Referring now more particularly to Fig. 3, the table i2 carries a supporting member I9 pivoted thereon by means of a stud at 58. The position of the member i9 may be fixed upon the table by means of the nut and bolt arrangement indicated enerally at 32.

A clamping member indicated generally at H, and comprising upper and lower clamping jaws Ila and Nb, is mounted in ways 33 on the member l9, so that after the position of the table I 2 has been set, further movement toward and away from the cutting knives is provided by movement of the member ll in the ways 33. The member H has threaded into it, a piston rod 34 which is attached to a piston 28 in the cylinder 26, which is fixedly mounted upon the member ill. The limit of movement toward the left of Fig. 3 is provided by abutment of the hub portion of the piston 2i against the cylinder head a. The limit of movement of the piston toward the right of Fig. 3 is fixed by the position of the limit screw 22.

The cylinder 20 may be pneumatic and if so, will be connected to a suitable source of pressure and provided with suitable valves. An exemplary ings.

limit of movementtoward the left is indicated by the broken line representing the left-hand edge of the member ll in its furthest position toward the left. In Fig.4, this movement is represented by the broken circular line representing the positions of the upper jaw I'Ia.

In Fig. I, the blank is indicated at l and an appropriate disappearing side stop is indicated at 2. The arrow indicates the direction of rotation.

The operation of my device will be apparent from what has been said above. A blank I to be cut to circular form is placed between the jaws 11a and I'll), which are then tightened by any conventional arrangement such as is indicated generally at 35. The table 12 is adjusted toward the left until the edge of the blank touches the" shearing point of the knivesi and 6. The knives are then set into rotation by any suitable means and air is admitted to the right-hand end of the cylinder 20, whereby the clamping member I1 is urged toward the left as indicated in the draw- Of course, the machine will be so set up that when the member I! is in its extreme lefthand position, the cutting point of the knives 5 and 6 will be on the desired circumference of the finished circie.- As the knives rotate and out, they of course, feed the blank rotatably.

It will be understood that modifications may be made in my invention without departing from the spirit of it.

Having thus described my invention, what I claim as new and desire to secure by Letters P atent is:- 1-. In a circular-shearing device, a base'fa pair of rotary knives mounted on said base, a table" mounted on said base in such manner that the distance between said table and said knives may be varied, a clamping device slidably mounted on said table, and means urging said clamping device toward said knives.

2. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a clamping device slidably mounted on said table, means for urging said clamping device toward said knives, and means limiting the extent of said slidable movement.

3. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a clamping device slidably mounted on said table, pneumatic means for urging said clamping device toward said knives, and means limiting the extent of said slidable movement toward said knives.

4. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a clamping device slidably mounted on said table, pneumatic means for urging said clamping device toward said knives, said last mentioned means comprising an air cylinder and a piston therein attached to said clamping device, the abutment of said piston against the head end of the cylinder serving to limit the extent of the slidable movement toward said knives.

5. In a circular shearing device, a base, a pair of rotary knives mounted onisaid base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a clamping device slidably mounted on said table, pneumatic means for urging said clamping' device toward said knives, said last mentioned means comprising an air cylinder and a piston therein attached to said clamping device, the abutment of said piston against the head end of the cylinder serving to limit the extent of the slidable movement toward said knives, and means for limiting the movement of said clamping device away from said knives.

6. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance betweensaid table and said knives may be varied, a clamping device slidably mounted on said table, pneumatic means for urging said .clamping device toward said knives, means limiting the extent of said slidable movement toward said knives, and means for limiting the movement of said clamping device away from said knives.

, device toward said knives.

8. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distancebetw'een said table and said knives may table, a clamping device slidably mounted on said support, pneumatic means for urging said clamping device toward said knives, and means limiting the extent of said slidable movement toward said knives.

9. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a support pivotally mounted on said table, a clamping device slidably mounted on said support, pneumatic means for urging said clamping device toward said knives, said last mentioned means comprising an air cylinder and a piston therein attached to said clamping device, the abutment of said piston against the head end of the cylinder serving to limit the extent of the slidable movement toward said knives.

10. In a circular shearing device, a base, a pair of rotary knives mounted on said base, a table mounted on said base in such manner that the distance between said table and said knives may be varied, a support pivotally mounted on' said table, a clamping device slidably mounted on said support, pneumatic means for urging said clamping device toward said knives, said last mentioned means comprising an air cylinder and a piston therein attached to said clamping device, the abutment of said piston against the head end of the cylinder serving to limit the extent of the slidable movement toward said knives, and means for limiting the movement of said clamping device away from said knives.

DAN R. MURPHY.

be varied, a support'pivotally mounted on said"

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