US2319766A - Punch press tool - Google Patents

Description

May 18, 1943. P, G, c L 2,319,766

PUNCH PRESS TOOL Filed May 14; 1 941 s Sheets-Sheet 1 I: INVENTOR P4AAf/P acax ATTORNEY May 18., 1943'. p. cox m- AL I 2,319,766

. PUNCH PRESS TOOL Filed May 14, 194.1 3 Sheets-Sheet 2 c MAZTOHNEY M y 1943- P. a. cox EI'AL 72,319,766

PUNCH PRESS TOOL Filed May 14, 1941 3 Sheets-Sheet 5 INVENTOR- PAPA/1? G-COX Patented May 18, 1943 2,319,766 PUNCH PRESS TOOL Parker G. Cox, Ja '1. Black, and Guy 0. Fricke, Detroit, Mich.

Application May'li, 1941, SerialNo. 393,402

Claims.

This invention relates to punch press tools and particularly to tools of this character for automatically forming and-assembling edge type filtering stacks such as are described in the patent to V. R. Heftler, No. 1,641,485, patented SeD-- tember 6, 1927.

Filtering stacks of this type are built up-of two different forms of elements arranged alter natelyand heretofore both types of elements have been of the same thickness.

c However, it has been found that for some purposes it is necessary to strengthen thefiiter stack without increasing the size of the filtering passages. This is effected by using wheel elements that are thicker than the star elements thus making it necessary to cut the respective elements from strips of stock of different thicknesses,

Present punch tools, as far as we are aware. are not adapted to satisfactorily form and assemble filter elements wherein said elements are of different thicknesses and it is, therefore, an important object of the invention to provide a punch press tool for automatically punching and assembling said elements into filter stacks.

Another object of the invention is to provide a device of this character which will pierce and blank out therespective types of elements from' stacking means is movable to receive and stack the various types of elements alternatelyas said elements are blanked from the respective pieces of stock.

A further object of the invention is to provide a device of this characterwhich will simultane ously pierce and blank a plurality of pieces or filter elements from each ribbon of stock and which will assemble same in a plurality of stacks.

While it will be understood that this invention may be applied to the manufacture of other there are but two types of pieces which are ar-' ranged in simple alternation. Reference will therefore be had to this specific application of the invention as shown in the accompanying drawings, wherein:

Figure 1 is a diagrammatic view of the invention attached to a punch press;

Figure 2 is a vertical section of the invention taken on line 2-2 of Figure 3;

Figure 3 is a plan view of the invention as seen with the bed or table of the press removed;

Figure 4 is an enlarged horizontal section taken on line 4-4 of Figure 2;

Figure 5 shows, at A and B, plan views respectively of the ribbons of metal from which are out two rows each of stars and wheels. The perforations for the stars and wheels, out in the respective ribbons prior to the blanking out operation, are also shown;

' Figure 6 shows, at C and D, the two different types of pieces made by the particular tool described herein and the orientation of the pieces with respect .to each other. It is to be noted that both types of pieces have a central triangular aperture so that when pieces of both types are alternately stacked on a stem, trian-- gular in cross-section, the assembly constitutes.

an edge type filter stack;

Figure '7 is a plan view of the die blocks for' punching and blanking the stars and wheels respectively; and

Figure 8 is a diagrammatic end view of the upper bolster plate carrying the punches.

As the punch press to which the present irivention is attached may be of any well knownties are sheared and that the completed piece falls through the blanking die.

The'piercing and blanking of the star and wheel elements in' the present invention is effected in the manner described in the next preceding paragraph, and, referring to the drawings the present device comprises a die block i 0 fixed to a bolster plate l2 which in turn is secured to bed M of the punch press. The die block II] has two parallel grooves l6 and i8 wide enough to slidably receive strips or ribbons of metal A and B respectively (Figure 5) therein and to guide said strips over the respective sets of dies for piercing star and wheel patterns and blanking out the star and wheel elements.

The mechanism whereby the strips A and B are fed to the dies includes a feed device of Wellknown construction and operation which is actuated by a cam 22 through pivoted lever 24 and link 2%. Cam 22 is mounted on a crankshaft 2B of the press and the crank portion 39 of said crankshaft is provided with a connecting rod 32 pivoted to the shank 34 of an upper bolster plate 36 which is reciprocatingly mounted on a guide 38 and which carries the punches which cooperate with the dies in the die block.

At the first station the pattern for the starwheel elements are punched in the strips A and B by punches 40 and 42 respectively, the patterns appearing in the ribbons A and B as shown at M and 45 in Figure 5. At this station each strip. is also perforated at 48 by punches At the next station a triangular center perforation 52 is punched in each pattern by punches 54, said patterns being properly positioned longitudinally of the die block over the respective dies by the entrance of pins 53 in respective perforations 48 in the strips A and B. At the final stations the star and wheel elements, shown at C and D respectively in Figure 6, are blanked out by blanking punches 58 and said elements then drop through the blanking dies.

It should be noted that two elements are pierced and cut from each strip of metal simultaneously in staggered relationship, as shown particularly in Figure 5 thus reducing waste of material.

The elements as they fall through the respective blanking dies are stacked by assembling mechanism which includes a loader having loader pins and 62 secured in a loader plate 64. lhe loader pings til and 62 are triangular in crosssection and arranged in staggered relationship as shown in Figure 3, the apexes of respective L pins 60 being pointed toward the apexes of respective pins 62. When the filter elements are cut from the mother stock, the free ends of the loader pins are positioned in the respective blanking dies directly beneath the triangular perforations 52, said perforations having been so punched, as shown in Figure 5, that their apexes correspond to those of the respective pins upon which they fall. The pins 5i) receive star elements while the pins 62 receive wheel elements.

The loader then is moved downwardly to a position whereat the loader pins clear the die block and the loader is then rotated 180 and raised to the loading position above described as the punches descend and operate on the strips of stock. As the loader has been rotated 180, the pins that received star elements now receive wheel elements and those that received wheel elements receive star elements. As this operation continues four stacks of elements are assembled with each stack built up of alternately arranged elements.

The number of stacks built up simultaneously is determined by the number of elements cut simultaneously from the strips of stock. If only one star and one wheel element were thus cut out, the loader would be provided with but two loader ins and two stacks would be simultaneously built up. On the other hand, should three or more elements be simultaneously cut from each strip of stock the loader would be provided with six or more loader pins according to the total number of elements simultaneously blanked from the strips of stock.

Due to the small cross-sectional area of the loader pins it has been found that they have a tendency to whip and vibrate when the loader is rotated and to prevent excessive whipping and vibration it is necessary to limit the length of said pins. Therefore, to provide for the stacking of a relatively large number of the elements on the loader before it is necessary to remove a fully loaded loader and replace it with an empty one it is necessary to provide for the building up of more than two stacks on the loader. Four loader pins for building four stacks simultaneously appears to be a satisfactory number for eificient operation of the machine bearing in mind the necessary limitations of the size of the loader pins.

The operation of the loader, as hereinabove described, includes both reciprocating movements and rotary movements. The mechanism for effecting vertical reciprocating movement of the loader includes a rod 65, threaded at its upper end and provided with nuts 58 between which a bracket 10 is clamped, said bracket being attached to the upper bolster plate 36 so that the rod 66 moves with said plate. Rod 66 passes through an opening in table M and a frame member 12 and the lower end of said rod engages the upper rounded surface of a knob 14 of a, yoke 16 which is pivoted at 18 to a bracket,

secured to member 72 so that downward movement of the knobbed end of the yoke raises the other end thereof. Said other end of the yoke is forked at 82 and each prong thereof has a pin 84 extending toward the opposite prong in substantially axial relationship therewith. Pins 84are received in an annular groove 86 in a collar 88 at the lower end of a vertical shaft 90 which is rotatably'and slidably received in a bearing 92 in frame member 72. Shaft 90 is provided with a small longitudinal bore at its lower end and an enlarged longitudinally extending connecting bore throughout the rest of its length in which is slidably received a shaft 94 having a fixed clamp member or jaw 95 secured to its upper end. The clamp member 96 has a laterally extending bolt 98 on which a movable jaw 99 is mounted and tightened by a winged nut Iflil. The

jaws of the clamp are adapted to receive and re prevented by bars I 94 which are fixed to said clampv and depend therefrom in spaced parallel relation to shaft 94, said rods being received in diametrical external grooves I06 in shaft 90.

Shaft 94 is retained in shaft 90 by a screw I08 received, in the lower end of the latter shaft anda spring I I0 disposed about said screw reacts between the lower end of shaft 94 and the lower end of the enlarged bore of shaft 99 and yieldingly urges the shaft 94 upwardly, limited normally by head I H of screw I 08. This construction permits telescoping of shafts 9i] and 94 when the loader is raised, said loader being limited in its upward movement by impingement against a member H4 beneath the die block. Thus too great an extension of the loader pins into the blanking dies of the die block is prevented and avoids any injury thereto by contact with the descending blanking punches, the loader pins being of such length as to have their ends spaced from said blanking punches when the latter are at beneath the perforations-52 forthe blanking and} loading operations, lugs II6 are provided on the" upper face of the loader plate 64, said lugs being received in positioning-holes provided therefor in member II4. Descent of the loader and support ing parts is effected by gravity and a spring II8 connected at one end 'to'the yoke 16 and at the other end to a pin I20 fixed in an extension of bracket 80. Ascrew I22 'in an inclined intermediateportion I24 of the bracket 80 providesstop means for limiting the downward movement of the loader and a lock nut- I26 locks said-screw in any desired position of adjustment.

The rotative movement of the loader is effected by the following described indexing mechanismz? A gear I30 is carried by shaft 90 adjacent the} lower end thereof and 'meshes with a gear I32 off suflicient length to permit gear I30 to remain in; mesh therewith throughout the vertical travel of said gear I30. Gear I32 is secured by screw I34 to a vertical shaft I36 having a ratchet wheel I38:

at its upper end and a sleeve I40 spaces the wheel-- I38-and gear I32 apart so as-to prevent bindingthereof against member 12 in which said sleeve is adapted to rotate. .A key I42 locks the gear I321 against rotative movement on the shaft I36. The ratchet wheel is'actuated by a ratchet in cluding a lever I44 having an extension I46 of reduced thickness which'fioats on a shoulder I48 of a screw I50 screwed into the free sideof ratchet wheel I38 in axial relationship therewith. The

lever is provided with'abore I52 and an extension a. longitudinally extending flattened surface I :3

adapted to engage the radial surfaces of the teeth I39 of wheel I38 and the free end of said rod I56 is flattened at I62, the surface I62 being inclined to the axisof the rod and adapted to slide freely on the teeth of the wheel I38 and to also prevent rotation of said rod I56 in the bore I52 by engagement with said wheel I38.

The lever I44 has a ball headed screw I64, screwed therein adjacent the free end thereof, said ball head being received in a socket I66 ad.- jacent one end of a link I68. A spring I10, held.

in the socket I66 by a threaded plug I12, provides I yielding retaining means for the ball head of screw I64. A similarsocket I14 adjacent the;

opposite end of link I68 receives the ball head ofgj a screw I16 in the end of an actuating lever I18; pivoted at I and having an ear I82 adjacent its. other end. Each I82 is provided with a roller I83.

which engages the peripheral cam surface of a cam I86 on crankshaft28 of the press. A spring I88 yieldingly urges the roller I84 into engagement with the cam I86.

Rocking movement of lever I18 causes oscillation of lever I44, thereby effecting intermittent rotative movement of ratchet wheel I38 through rod I56 which progressively engages the teeth of said wheel I38 and rotates said wheel a limited amount with each wheel actuating movement of said lever I44. The ratio of gears I32 and I30 is such that the limited rotation of the former effected by the ratchet mechanism effects a 180 rotation of the latter gear.

To prevent too free rotation of gear I32, a friction device is provided which comprises a plunger I90 slidable in a bore in member I12 and having a frictionplug I94 of leather or other suitable material which is pressed against the upper surface of gear I32 by a spring I96 which reacts between the. inner end of plunger I90 and a plate I98 which is movable by ascrew 200 to adjust the tension of spring I96. A look nut 202 is provided on screw 200 to lock same in adjusted positions. While only one such friction device. is

shown in the'drawings and herein described a.

plurality of them may be used if desired.

Means is also provided for effecting accurate positioning of the indexing ratchet wheel after each operative movement of the ratchet. The

positioningimeanscomprises a pin 204 in a bore 206. .The .pin 204, aided by the friction device described in the next preceding paragraph, resists reverse rotation of the wheel I38 and gear I32 which might otherwise occur during the return movement of the ratchet operating lever after an operative movement thereof. It will be understood" that while one positioning device including the pin 204 isshown and described several of said devices may be used if required.

A brief summary of the operation of the invention is as follows:

With'each punching operation of the press, the Y bolsterplate 36 carrying the punches, descends and simultaneously the loader is moved to its uppermost position where its loader pins receive the respective filter elements blanked from the strips of stock. As the plate 36 is raisedby the crank 30, theloader descends to a position whereat the loader pins are clear of the die block. Cam I86 then actuates'the indexing mechanism whereby the loader is given a turn of As the punches descend. for the next punching operation, the loader is again raised to the loading position.

While the invention has been made primarily for the forming and stacking of elements or stampings of different thicknesses it is to be understood that it also has utility in stacking elements of different types or having different characteristics even though said elements are not of different thicknesses.

It is thought that the invention and many of its attendant advantages will beunderstood from the foregoing description, and it will be apparent that various changes may be made in the form, construction, and arrangement of the parts without departing from the spirit and scope of the in vention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

We claim:

1. In a progressive punch press tool; a plurality of pattern dies, pattern punches corresponding thereto, a plurality of blanking dies, means for feeding a plurality of pieces of stock to said dies, a rotatable loader, loader pins for said loader, there being one pin for each blanking die, said pins being aligned with and arranged to enter the blanking dies and receive thereon stamped members as they are blanked from said stock, means for moving the loader pins into the blanking dies and withdrawing them therefrom, and means for rotating the loader to position the loader pins in alignment with different blanking dies than those last aligned with when the loader pins are withdrawn from said blanking dies.-

2. The invention defined in claim 1, wherein the loader is adapted to be removable when the loader pins are withdrawn from the blanking dies.

dies for forming and blanking a pair of iden-' tical stampings, correponding punches for said dies, a second set of dies and corresponding punches therefor for forming and blanking a pair of identical stampings of a type different from the first mentioned stampings, means for feeding a strip of stock to each set of dies; a rotatable loader comprising a loader plate, and a pair of loader pins fixed to the loader plate on each side of the axis thereof, means for moving the loader toward and away from the dies, and means for intermittently rotating the loader 180, each pair of loader pins being disposed in alignment alternatively with one pair of dies and then the other at the end of each rotative movement of guide openings therein, and guide pins on the loader adapted to be received in said openings when the loader is moved against said fixed member.

6. In a punch press tool, an assembling mech anism for stacking filter stampings including a rotatable loader, means for intermittently rotating said loader predetermined amounts, and means for reciprocating the loader.

3. In a progressive punchpress tool; a set of '7. In a punch press tool, an assembling mechrotatable loader, means for effecting intermittent rotating movements of said loader, said movements being of limited predetermined increments, and means for reciprocating the loader alternately with respect to the intermittent rotating movements thereof. r

8. The invention defined by claim '7 wherein the punch press tool has a die and the loader is reciprocated toward and away from said die.

9. In a progressive punch press tool: a set of staggered dies and punches for forming and blanking a plurality of identical stampings, a second set of staggered dies and punches for forming and blanking a plurality of identical stampings of a type different from the first mentioned stampings, means for feeding a strip of stock to each set of dies, a rotatable loader comprising a loader plate and a set of loader pins fixed to the loader plate on each side of the axis thereof, each set of loader pins being staggered in accordance with the staggering of the respec tive dies, means for intermittently rotating the loader, each set of loader pins being disposed intating said loader to bring the loader pins into alignment with respective blanking dies, means for reciprocating the loader at the end of each rotative movement whereby the pins enter the respective blanking dies,means for limiting the reciprocating movement of the loader toward the dies whereby the free ends of said pins are disposed closely adjacent to the stampings, means for positively aligning the pins with respect to the stampings for reception of the latter on the former, and resilient means interposed between the-loader and the means for reciprocating same.

PARKER G. COX. JAY T. BLACK. GUY C. FRICKE.

CERTIFICATE OF CORRECTION. Patent No. 2,519,766. my 8, 9 m.

PARKER G. cox, ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction asfollowsz Page 2,' first column, line 58, for "pings" read -pins-; page 5, first column, line 65, for "Each" read -Earand that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 27th day of July, A. D. 1915.

Henry Van arsdale, (Seal) Acting Commissioner of Patents.

Images