US2287254A - Metalworking machine - Google Patents

Description

June 23, 1942. H. s. KELLOGG 2,

METALWORKING MACHiNE Filed May 19, 1941 2 Sheets-Sheet 1 INVENTOR HOMER G.K ELLO66 June 23, 1942. H. ca. KELLOGG METALWORKING MACHINE Filed- May 19, 1941 2 Sheets-Sheet 2 F lG. 2.

- INVENTOR HOMER G.KELL06G .4

Patented "June 23, 1942 IVIETALWORKIN G MACHINE Homer G. Kellogg, Detroit, Mich., assignor to Motor Products Corporation, Detroit, Mich, a corporation of New York Application May 19, 1941, Serial No. 394,216

7 Claims.

This invention relates generally to metal work'- ing machines and refers more particularly to improvements in cut-ofi devices employed in connection with metal working machines.

One of the principal objects of this invention is to provide a metal working machine having means for advancing a continuous length of stock along a predetermined path of travel and having a cut-off device operable to periodically sever strips of predetermined length from the stockwhile the latter is moving alongits path of travel.

Another object of this invention is to provide a metal working machine having power operated meansv for simultaneously operating the cut-off device to sever the stock and for moving the cutoff device in the direction of movement of the stock at a rate predetermined to permit severing the stock while the latter is moving along its path of travel.

Another advantageous feature of this invention is to provide a metal working machine having a cut-off device in the form of a revoluble knife supported to one side of the path of travel of the stock for movement across the path of travel to sever the stock and having means for advancing the cut-off device at substantially the same rate as the stock during the interval thetion to the bending operation to sever the bent portion of the stock without interrupting movement of the stock along its path of travel.

The foregoing, as well as other objects, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings, wherein:

Figure 1 is a fragmentary side elevational view partly in section of a metal working machine equipped with a cut-off device constructed in accordance with this invention;

Figure 2 is a fragmentary side elevational view of the metal working machine showing the parts thereof in a different position;

Figure 3 is an enlarged elevational view'of the side of the machine opposite to 'the side'shown in Figures 1 and 2;

' Figure 4 is a sectional view taken substantially on the plane indicated by the line 44 of Figure'2;

Figure 5 is a fragmentary plan view of the construction shown in Figure 3; and Figure 6 is a cross sectional view through the strip formed by the metal working machine. v

For the purpose of illustrating the present invention, I have selected a metal working machine particularly I designed for, fashioning a channel-shaped window frame of the type commonly used in connectionwith the pivoted panel v of a vehicle body ventilating window. However,

it will be understood from the following descripi be noted that the reference character A designates a frame of the type commonly used on the pivoted panel of a vehicle body ventilating win dow. The frame A is shown in its inverted position in Figure 1 and is fashioned from a lengthof channel-shaped stock in such a manner that when applied to a pivoted panel, it extends along the bottom, front and top edges of the panel. When'the frame A is used for the above purpose, the rear side thereof is left open in'order topermit the rear edge of the panel to be engaged by the usual division bar which isbitherpermanent- 1y secured in the window opening or is carried by the front edge of the vertically slidable panel of the ventilating window.

Referring now more in detail to the metal working machine selected herein for the purpose of illustration, it will be noted that this machine comprises a plurality of sets of forming rolls l0 cooperating with each other to form a strip of flat'stock to the desired cross sectional contourv stock. The bending fixture I2 is periodically operated to bend the stock to the longitudinal contour illustrated in Figurel, and this operation is affected automatically by a cam I3. The'cam I3 is keyed to a drive shaft I4 which is connected to a suitable source of power (not shown) and has a driving gear I5 secured thereto for operating the forming rolls through a suitable gear train (not shown). The periphery of the cam I3 is engaged by a follower I5 secured to the forward end of the bending fixture I I and cooperating with the cam to swing the bending fixture about the axis of the shaft I2 in a manner to bend the stock to the longitudinal contour shown in Figure 1. shape of the periphery of the cam controls the contour to which the stock is bent'and; accordingly, the stock may be bent to various different contours by merely providing correspondingly shaped cams I3.

The above construction is such that aiportion of the stock is bent to the contour shown in Figure 1 during each revolution of the cam' I3, and the bent portion ofthe stock is severed from the remainder after each bendingoperation. It has been proposed to interrupt advancement of the stock by stopping the machine after each bending operation and to'sever the stock during this interval of rest. The above'procedure is not only objectionable because it slows down the production of the machine but, also, because the inertia of the revoluble parts of the machine tends to carry the strip beyondthe point of cutoff and thereby rendersit. difficult toprovide.

strips-of uniform lengths.

This invention eliminates the above objections by providing a cut-off device which operates subsequent to each bending operation to sever the stock without interrupting advancement of thestock along its path of travel. In detail, the cut-off device is shown in the several figures of the-drawings as comprising a" knife I5 supported beyond the bending fixture II toone sideof the path-of travel of the stock for rocking movementin: a manner to'permit the knife to move across the path of travel'of the stock and sever the same. As will be presently set forth; the cut-off device is moved in'the' direction of advancement of the stock at substantially the same rate as the stock during the interval the knife I6 isrocked in a direction to sever the stock. As a result, the stock is severed while it is being advanced by the forming rolls and, accordingly, the severed.

strips will be'of'uniform length.

In detail, it will be noted that the knife I6 extends radially outwardly from a shaft I'I- having-a stud I8 at the rear endrotatably supported in a backing plate I9. The plate IB' is slidably supported on a frame member 28 of the machine andtis provided with a recess. 2! through which the stock is moved as it is advanced beyond the bending fixture II. The arrangement is such that the backing plate. I9 holds the stock against end of the drive shaft 25 is rotatably supported,

in bearings 26 spaced from each other axially of It follows from the above that the.

the shaft and secured to the frame member 20. Upon reference to Figure 4, it will be noted that a pinion 21 is secured to the drive shaft 25 between the bearings 25 and meshes with the teeth on a vertically extending rack 28. The rack 28 is supported on the frame structure 20 for vertical sliding movement and carries a stop in the form of a pin 29 which engages the bottom surface of the frame structure 20 to limit the upward movement of the rack relative to the frame structure. When the rack is in its uppermost position, shown in Figure 4, the knife I6 on the cut-off device is in its inoperative position, shown in Figure 5.

The rackais held in its uppermost position by means of a relatively strong spring 30 having the upper end anchored on the frame structure 20 and having the lower end connected to a hook 3I which, in turn, is pivotally connected to the lower'end of the rackt28= As-shownin'Figure 1, the

lower end'of the spring 30isconnected to the free end of the hook 3| by a-pin-3I' offset-rearwardly with respect to. the pivotal connection between the hook and" rack.- As a result, the spring-tends-to swing' the lower end of the hook rearwardly relative. to the -rack and this movement: of the hook is prevented by-means of a channel-shaped, guide 32, shown. in Figure 4. The channel-shaped guideis-sopositioned that the base portion 32' slidably engages the front edge of the hook in a manner to cooperate with the spring 30-111. normally holding the hook against. swinging movement; 7

The hook 3|? is adaptedtobe engaged by a tooth..33-. extending outwardly-from the periphery ofa disc 34. The disc 34- is-securedto the drive shaft I4 to one side. of the. cam I3 and the tooth 33l. isangularly positionedwith. respect to the cam to engage the hook 3| on therack: 28. as thebendingfixture II. completes. one. bending operation of. the strip-of. stock...

Ihe tooth 33 coacts,with:thehook 3| to movetheraek 28.downwardly against. the, actionof the spring 30.

the path. of travel of thestock .and severs. the bent portion. ofthestock: from the remainder. of the latter. The extent, of downwardv movement of the rack 28 and,conseque.ntly, theangular. travel of the knife IBis limited-by engagement of a stop 35 on the rack with the upper end-of. the vertical guide 32. Consequently, continued rotation o fthe disc 34' in the direction of, the arrow in Figure 2 swings the book 31' forwardlyagainst the actionof the spring 30. andpermits the tooth 33 to movebeyond the hook. As soon as. the tooth 33 moves beyond, the hook, the spring 30 returns the hook to its initial position and moves the-rack28 to-its uppermost position, shown in Figure 4; This operation, of. course, rocks the cut-off device in'the opposite direction and returns the knife I6 to its inoperative position, shown in Figure 5.

As pointed out above, the cut-off device together with the knife I6 is moved in the direction of advancement of the stock at the same rate as the latter during: the operation of the knife to sever the stock. For accomplishing this result, I provide a link 31' having the rear endpivoted to the framestructure by means of a bracket 38 and having the other end extending; between the stops 29 and 35 on the rack. 28 in engagement with both stops.

of a clamp 40 and the upper end of the lever is This. movement. of the-rack 28 rocksthe knif'eJB relative to. the. plate, I 9; across A lever 39,-is clamped-:tothelink 31 intermediate the ends thereof by means engaged by a member secured to a plate 42'. The plate 42 slidably engages the frame member 29 and is secured at its rear end to the plate l9 for movement therewith as a unit.

As a result of the above construction, it will be noted that as the rack 28 is moved downwardly by the tooth 33 on the disc 34, the link 21 swings downwardly about its pivotal connection with the bracket 38 and swings the upper end of the lever 39 in a forward direction. Inasmuch as the upper end of the lever 39 engages the member 4|, and in view of the fact that the member 4| is connected to the plate l9, it follows that the latter is correspondingly moved in a forward direction. It will also be noted that the cut-off device is secured to the plate I9 and is splined on the drive shaft 25 with the result that the cut-ofi device is moved by the plate l9 in the direction of advancement of the stock during the interval the rack 28 functions to rotate the cut-off device to sever the stock. The proportion of the parts is so determined that the cutoff device is moved forwardly by the rack 28 at substantially the same rate as the rate of travel of the stock so that the bent portion of the stock is severed Without interrupting the opera tion of the machine. It may be pointed out at this time that when the hook 3! is released by the tooth 33 on the disc 34, the cut-off device and associated parts are returned to their rearwardmost positions by means of a spring 50 having the forward end secured to the frame structure 20 and having the rear end suitably connected to the plate 42.

Operation While it is believed that the operation of the machine will be clearly understood from the foregoing description, nevertheless, a brief summary of the operation will be given at this time.

In Figure 1 of the drawings, parts of the machine are illustrated in the positions they assume immediately after the fixture ll completes one bending operation. As the drive shaft l4 continues its rotation in the direction of the arrow shown in this figure, the tooth 33 engages the hook 3| and moves the rack 28 downwardly. Downward movement of the rack 28 performs a dual function in that it simultaneously rocks the cut-off device to swing the knife l6 across the path of travel of the stock and moves the cut off device in the direction of the path of travel of the stock. As a result, the bent portion of the stock is severed from the remainder of the stock by the knife IS on the cut-off device without the necessity of interrupting the movement of the stock through the machine. In other words, this construction renders it possible to form the bent frame members A by a continuous operation of the machine, and this is advantageous in that it materially increases the production of the machine. It is also important to note that by severing the stock during the interval the cut-off device is moved as a unit with the stock in the direction of advancement thereof, the severed portions of the stock will all be of uniform length.

As the hook 3! is released by the tooth 33, the spring 36 returns the rack 28 to its uppermost position determined by the stop 29 and also returns the cut-off device to its inoperative position adjacent the path of travel of the stock. At the same time the cut-off device is rocked to its inoperative position by the spring 30, the upper end of the lever 39 is swung in a rearward direction and the cut-off device is moved axially rearwardly by the spring 50 to its initial starting position adjacentthe bending fixture ll.'

What I claim as my invention is:

1. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a cut-off device supported to one side of the path of travel of the stock forrocking movement and having a cutting portion movable across the path of travel of the stock to sever the stock, a rack supported for reciprocation transversely of the axis of rocking movement of the cut-off device, means for periodically reciprocating the rack, and a connection between the rack and cut-off device operable upon movement of the rack in one direction to simultaneously rock the cut-off device to sever the stock and to move the cut-off device in the direction of advancement of the stock.

2. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a plate supported at the delivery end of the machine and having a groove therein for receiving the stock as it is delivered from the machine. a rockable cut-off device supported on the plate at one side of the path of travel of the stock for rocking movement about a fixed axis and having a portion movable across the path of travel of the stock to sever the latter, means for periodically rocking the cut-off device relative to the plate to sever the stock, and means for moving said plate and cut-off device in the direction of travel of the stock during the operation of the cut-off device to sever the stock.

3. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a cut-off device supported to one side of the path of travel of the stock for rocking movement and having a cutting portion movable across the path of travel of the stock to sever the latter, a rack mounted for reciprocation transversely to the aXis of rocking movement of the cut-off device and having a hook at one end, a revoluble member having a tooth engageable with the hook to move the rack in one direction, means responsive to movement of the rack in said one direction for rocking the cut-off device to sever the stock and for moving the cut-off device as a unit with the stock in the direction of advancement thereof, means pivotally supporting the hook on the rack permitting the hook to swing out of engagement with said tooth upon continued rotation of said revoluble member, and means operable upon releasing the hook from said tooth to move the rack in the opposite direction and return the cut-off device to its original starting position.

4. In a metal Working machine, means for advancing a strip of stock along a predetermined path of travel, a shaft supported for rotation about a fixed axis parallel to the path of travel of the stock and positioned to one side of said path of travel, a rack supported for reciprocation transversely of the axis of the shaft and connected to said shaft for rotating the latter in opposite directions, a cut-off device slidably and non-rotatably connected to said shaft for operation by the latter to sever the stock, and means operated by said rack upon movement of the latter in one direction to advance the cut-off device in the direction of the path of travel of the stock.

5. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a cut-off device supported at one side of the path of travel of the stock for rocking movement about a fixed axis extending parallel to the path of travel of the stock, a shaft supported for rotation in axial alignment with the cut-off device and having a slidable non-rotatable connection with the cut-off device, means for rotating said shaft in opposite directions to impart a corresponding rotative movement to the cut-off device, and means operated by said shaft rotating means upon rotation of the shaft in one direction to advance the cut-off device relative to the shaft in the direction of the path of travel of the stock.

6. In a metal working machine, means for advancing a strip of stock along a predetermined path of-travel, a cut-off device supported to one side of the path of travel .of the stock for rotation in opposite directions about a fixed axis extending parallel to the path of travel of the stock, a shaft supported for rotation in opposite directions in alignment with the cut-01f device and having a slidable non-rotatable connection with the cut-off device, a rack supported for reciprocation in opposite directions and operatively connected to said shaft, means for reciprocating the rack to successively move the cut-oil device across the path of travel of the stock to sever the latter and to return the cut-off device to its inoperative position, and means operated'by said rack as the latter is moved in a direction to effect severing ofthe stock by-the cut-off device to advance the cutoff device in the direction of the path of travel of the stock.

7. In a metal working machine means for advancing a strip of stock along a predetermined path of travel, a slide supported for movement in opposite directions parallel to the path of travel of the stock, a cut-off device rotatably supported on said slide toone side of the path of travel of the stock, a shaft supported for rotation in opposite directions in axial alignment with the cut-off device and having a slidable non-rotatable connection with the cut-off device, a rack supported for reciprocation transversely of the axis of rotation' of said shaft and connected to the shaft for rotating the latter in opposite directions, means for reciprocating the rack to successively move the cut-off device across the path of travel of the stock to sever the latter and to return the cut-oil device to its inoperative position, and means operatively connecting the rack to said slide for moving the slide in the direction of the path of travel of the stock as the cut-off device is moved across saidpath of travel by the stock.

HOMER G. KELLOGG.

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