US3164049A - Punch press having radially expansible jaws to receive a centrally apertured workpiece - Google Patents

Description

1965 D. NETTLETON ETAL 3,164,049

PUNCH PRESS HA LLY EXPA TO RECEIVE A Filed Oct. 18, 1962 VING RADIA NSIBLE JAWS CENTRALLY APERTURED WORKPIECE 3 Sheets-Sheet l BY STA/V4 Z. Auo: Sa/V a A 77012 N578 ,1965 D. F. NETTLETON Em 3,16 ,049

PUNCH PRESS HAVING RADIALLY EXPANSIBLE JAWS TO RECEIVE A CENTRALLY APERTURED WORKPIECE Filed Oct. 18, 1962 3 Sheets-Sheet 2 INVENTORS 0 y 4p F Warns/1w gYT'ANL 5 7L. ANDE :aN f M ,477 8/1/6345 United States Patent Ofifice 3,164lfi49 Patented Jan. '5, 1965 3,164,4149 PUNCH SERIES HAVING RADIALLY EXPANSIBLE JAWS T RECEEVE A CENTRALLY APERTURED WGRKFIECE Donald F. Nettleton and Stanley L. Anderson, both A. N. Tool & Die, 518 S. Fair Oaks, Pasadena, Calif. Filed Oct. 18, 1962, Ser. No. 231,491 2 Claims. (Cl. 83-206) This invention relates to punch presses, more particularly to punch presses for punching a ring of equally spaced holes or slots in a circular blank to form an electric motor lamination, or the like.

Included in the objects of this invention are:

First, to provide a. punch press wherein a circular blank is mounted for rotation on a holder having a fixed axis, and the punch and die assembly is radially movable to accommodate blanks of various diameters.

Second, to provide a punch press which incorporates a novel means driven from the punch press drive shaft to index the blank, the indexing means having readily interchangeable elements to permit variation in the number of punch operations to complete the punching of a selected circular blank, and means for ensuring accurate positioning of the blank for each punch operation.

Third, to provide a punch press of this type which is particularly adapted for punching disks of small diameter.

With the above and other objects in view, as may appear hereinafter, reference is directed to the accompanying drawings in which:

FIGURE 1 is a side view of the punch press with portions shown fragmentarily;

FIGURE 2 is a fragmentary, sectional view taken through 22 of FIGURE 1, showing the manner in which the collet holder is clamped;

FIGURE 3 is a fragmentary, sectional view taken through 33 of FIGURE 1, showing the means whereby the collet and workpiece is rotated and indexed, and indicating fragmentarily the punch and die assembly;

FIGURE 4 is an enlarged, sectional view taken within circle 4 of FIGURE 3, showing the lower end of the push bar and collet shaft;

FIGURE 5 is a fragmentary, elevational, sectional view taken substantially through55 of FIGURE 1, showing the punch press drive shaft and the right angle drive connected therewith;

FIGURE 6 is a fragmentary, sectional view taken through 66 of FIGURE 1, showing the adjustable crank and gear drive associated therewith;

FIGURE 7 is a fragmentary, sectional view taken through 77 of FIGURE 3, showing particularly the final indexing means;

FIGURE 8 is a fragmentary, sectional View taken through S8 of FIGURE 3, showing the punch and die unit and adjacent portions of the collet with the workpiece in position thereon;

FIGURE 9 is an enlarged, fragmentary,'plan view taken through 9-9 of FIGURE 8, showing a workpiece and its relationship to its supporting collet and to the die.

Thepunch press includes a bench structure 1 forming a horizontal platform on which is mounted a bed plate 2. The bed plate is provided with spaced guide ways 3 which receive slide members 4 secured to the lower or base portion 5 of a punch press framed.

FIGURE 8.

A screw shaft 7 operated by a handwheel 8 held by a bracket 9 at the rear side of the bench structure 1 is operatively connected with the slide members 4 so that the punch press may be moved forwardly and rearwardly with respect to the bed plate 2. The guide ways 3 are provided with screws 19 so that the punch press may be secured in any of its adjusted positions.

The base portion 5 of the punch press frame 6 supports a die plate 11 which in turn supports a die set 12. The die set includes a lower mounting plate 13 having up wardly extending guide sleeves 14 which slidably receive guide pins 14a depending from an upper punch plate 15.

Supported on the mounting plate 13 is a die plate 16 having a die cavity 17 therein which cooperates with a punch 18 carried by the punch plate 15. A Stripper 19 is also carried by the punch plate 15.

The die set 12 so far described may be considered as conventional. However, it differs from the conventional die set or punch and die set by reason of the fact that the die cavity 17 is located as close to the forward edge of its die plate 16 as is possible, this being shown best in The die cavity 17 extends through the die plate 11and communicates with a discharge passage 20 sloping downwardly towards the rear side of the punch press.

The punch press frame'6 includes an upper portion 21 whichoverhangs the die set 12 and is provided with a drive shaft 22 having an eccentric 23 which reciprocates a ram 24. The drive shaft 22 is provided with a flywheel 25 driven by a motor 26 The punch press structure just described may be considered as conventional.

Located at the forward end of the bed plate 2, and preferably welded thereto, is an upwardly extending tubular pedestal 27 which receives a sleeve 28' externally screw-threaded at its upper end to receive an adjustment nut 29 which rests on the upper end of the pedestal 27. The upper end of the pedestal 27 is split and is provided with a clamp screw 3%, as shown in' FIGURE 2, so that the sleeve 28 may be securely clamped in any vertically adjusted position.

The sleeve 28 is provided with upper and lower bearings 31 which journal a vertically disposed collet shaft 32. The upper end of the collet shaft'32 supports an upwardly extending internal collet 33 held by a retaining collar. 34. The collet 33 includes a split stem 35 which is located immediately forward of the die plate and the cavity 17 therein.

The split stem 35 terminates in a supporting shoulder 36 from which projects .a split centering boss 37. The centering boss 37 and collet 33 aretubular. A down- *wardly tapered, expanding head 38 fits within'the centering boss37 so that when drawn downwardly the centering boss is expanded forthe purpose of holding a workpiece, as will be described hereinafter. The expanding head 33 forms the upper end of a vertical push bar 39, which extends downwardly through the collet shaft 32.

Secured to the lower end of the sleeve 28, and vertically adjustable therewith, is a gearhousi'ng 40 having bevel gears 41, one of which is mounted on the collet shaft 32 and the other of which is secured toa lateral shaft'42 extending through bearings 43 provided in a lateral or horizontal housing 44. v

The lateral shaft 42 protrudes from the lateral housing "44 and is equipped with a ratchet lever 45 and a ratchet gear 46. The ratchet lever is provided with a radial slot 47 in which is a radially adjustable ratchet pawl 43.

The slot 47 also adjustably receives one end of a link 49, the other end of which is attached to a cross slide 59 adjustable in a diametrical slot 51 formed in a crankwheel 52. A set screw 53 effects adjustment of the cross slide 7 50 with respect to the axis of rotation of the crankwheel 52 so as to adjust the throw of the link 49.

The crankwheel 52 is mounted on a horizontal shaft 54 located rearwardly of the shaft 42. The shaft 54 is supported by bearings 55 provided within a lateral ex tension of a bevel gear housing 56. The bevel gear housing contains a bevel gear set 57, one of which is mounted on the shaft 54 and the other of which is mounted on a vertical shaft 58 supported by bearings 59 within the housing 56. The bevel gear housing 56 is secured to the underside of the bench structure 1 and the vertical shaft 58 extends upwardly therethrough.

The upper end of the shaft 58 is joined by a universal coupling 60 to a longitudinally adjustable linking shaft 61 which extends into a bevel gear housing 62 having a bevel gear set 63 therein, one of which is joined to the linking shaft 61 and the other of which is joined to the drive shaft 22 of the punch press.

The lower end of the collet shaft 32 protrudes downwardly through the gear housing 40 and receives a cam wheel 64 and a final indexing wheel 65. Secured to one side of the bevel gear housing 62 and vertically movable therewith is a bracket 66 which reciprocally supports an indexing pin 67 adapted to engage the final indexing wheel 65.

As shown best in FIGURE 7, the indexing pin 67 is mounted on a rod 68 which projects through one end of an oscillating lever 69. Collars 70 on opposite sides of the oscillating lever 69 transmit movement of this end of the lever to the rod 68 and indexing pin 67. A spring 71 is disposed between the indexing pin 67 and one of the collars 67 so as to accommodate overtravel of the oscillating lever 69. Adjustment nuts 72 are provided so as to adjust the indexing pin 67 in proper relation to the final indexing wheel 65.

The oscillating lever 69 is journaled intermediate its ends by a fulcrum pin 73 carried by the bracket 66. The oscillating lever 69 is connected by a link 74 to an eccentric wheel 75 secured to the lower end of the vertical shaft 58 carried by the gear housing 56. The ratio of the various bevel gears is such that with each rotation of the punch press drive shaft 22 the indexing pin 67 is moved into and out of engagement with the final indexing wheel 65.

The lower end of the push bar 39 protrudes below the extended lower end of the collet shaft 32, and is provided with a cap nut 76 above which is positioned a spring 77 for the purpose of urging the push bar 39 in a downward direction so as to cause the collet 33 to expand.

A lever 78 pivotally supported by an extension 79 of the bracket 66 is adapted to engage the cap nut 76 for the purpose of lifting the head 38 of the push bar 39 to I permit retraction of the collet 33. The extended end of the lever 78 is positioned for engagement by an air cylinder 80, or an armature of a solenoid. The air cylinder or solenoid 80, as the case may be, is controlled by a cam-operated switch 81 which is engaged by a cam lug 82 provided on the cam wheel 64. A single cam lug is provided so that the collet 33 will be released once for each revolution of the collet 33 and its workpiece.

Adjustable stops 83 are provided to limit the movement of the lever 78, and an adjustment screw 84 may be carried by the lever 78 and located under the cap nut 76. Also carried by the lever 78 is a second adjustment screw 85 which engages a cycle or program-terminating switch 86, electrically connected in a suitable manner not shown, to terminate operation of the punch press when the collet 33 has completed one revolution.

Operation of the punch press is as follows:

The punch press is intended to punch circular or diskshaped blanks A, shown best in FIGURE 9, which have central openings B adapted to fit over the centering boss 37 of the collet 33. The central openings B in the blanks may be of a standard size, irrespective of the diameter blank, in which case a single collet 33 may be utilized for blanks of various diameters. In order to accommodate various diameters of blanks, the punch press frame 6 is moved radially to and from the axis of the collet 33, while the collet is maintained accurately in a fixed, vertical axis.

Each time the punch press performs a punching operation, involving one rotation of its drive shaft, the adjustable crankwheel 52 is caused to make one revolution. In doing so, the ratchet lever 45 causes the ratchet pawl 48 to move through a predetermined are relative to the ratchet Wheel 46. A set of ratchet wheels, having appropriate numbers of teeth, is provided so that for each cycle of operation of the punch press the collet 33 will be turned or indexed through a predetermined arc.

The ratchet gear 46 and ratchet pawl 48 need accomplish only a coarse indexing of the collet 33 and workpiece. Final indexing is accomplished by the final indexing Wheel 65 and its indexing pin 67, which is timed to enter the appropriate slot in the indexing wheel 65 immediately before the punching operation. A set of interchangeable final indexing wheels 65 is also provided.

By interchanging die sets, by radially adjusting the punch press, and by selecting ratchet wheels and indexing wheels having the appropriate number of teeth, circular blanks varying substantially in diameter and requiring different numbers of punohouts C may be readily accommodated.

While a particular embodiment of this invention has been shown and described, it is not intended to limit the same to the exact details of the construction set forth, and it embraces such changes, modifications, and equivalents of the parts and their formation and arrangement as come within the purview of the appended claims.

What is claimed is:

l. A punch press for punching a ring of apertures in a circular blank, comprising:

(a) a rotatable collet assembly including a collet chuck having radially expansible jaws to receive a centrally apertured blank, and a centrally disposed push bar for expanding said jaws to grip said blank;

(b) means for journaling said collet means for rotation of said blank about a vertical axis;

(c) means for indexing said collet means and blank;

(d) a punch press including a punch and die set having an axis of operation parallel to and radially offset from the axis of rotation of said blank;

(2) a bed structure for said punch press including guide ways and adjustment means to shift said punch press and die set radially with respect to said blank;

(1) a drive assembly connecting said punch press and said collet means, said drive assembly including indexing means to turn said blank through a predetermined arc with each operation of said punch press;

(g) and means for actuating said push bar on indexing said blank through a complete circle to release said blank.

2. A punch press for punching a ring of apertures in a circular blank, comprising:

(a) a rotatable collet assembly including a collet chuck having radially expansible jaws to receive a centrally apertured blank, and a centrally disposed push bar for expanding said jaws to grip said blank;

(b) means for journaling said collet means for rotation of said blank about a vertical axis;

(0) a punch press including a drive shaft and a punch and die set having an axis of operation radially olfset and parallel to the axis of rotation of said blank;

(d) a bed structure for said punch press including guide ways and adjustment means to shift said punch press and die set radially with respect to said blank;

(e) a drive assembly interconnecting said punch press drive shaft and collet means;

(f) said drive assembly including a ratchet and pawl means for effecting coarse indexing of said blank; (g) a final indexing means including an indexing Wheel connected with said collet for rotation therewith, a

pin engageable with said wheel, and operating means 10 for said pin to cause engagement with said wheel as said ratchet and pawl means moves said collet and blank to an approximate indexed position;

(72) and means for actuating said push bar on indexing 15 said blank through a complete circle to release said blank.

References Cited in the file of this patent UNITED STATES PATENTS Lindgren Feb. 9, 1909 Deats July 9, 1912 Dilks Aug. 18, 1936 Baker Feb. 18, 1941 Hallander Dec. 23, 1947 Bailey Feb. 14, 1956 FOREIGN PATENTS Germany Aug. 25, 1892 Germany Oct. 31, 1957

Claims (1)

1. A PUNCH PRESS FOR PUNCHING A RING OF APERTURES IN A CIRCULAR BLANK, COMPRISING: (A) A ROTATABLE COLLET ASSEMBLY INCLUDING A COLLET CHUCK HAVING RADIALLY EXPANSIBLE JAWS TO RECEIVE A CENTRALLY APERTURED BLANK, AND A CENTRALLY DISPOSED PUSH BAR FOR EXPANDING SAID JAWS TO GRIP SAID BLANK; (B) MEANS FOR JOURNALING SAID COLLET MEANS FOR ROTATION OF SAID BLANK ABOUT A VERTICAL AXIS; (C) MEANS FOR INDEXING SAID COLLET MEANS AND BLANK; (D) A PUNCH PRESS INCLUDING A PUNCH AND DIE SET HAVING AN AXIS OF OPERATION PARALLEL TO AND RADIALLY OFFSET FROM THE AXIS OF ROTATION OF SAID BLANK; (E) A BED STRUCTURE FOR SAID PUNCH PRESS INCLUDING GUIDE WAYS AND ADJUSTMENT MEANS TO SHIFT SAID PUNCH PRESS AND DIE SET RADIALLY WITH RESPECT OT SAID BLANK; (F) A DRIVE ASSEMBLY CONNECTING SAID PUNCH PRESS AND SAID COLLET MEANS, SAID DRIVE ASSEMBLY INCLUDING INDEXING MEANS TO TURN SAID BLANK THROUGH A PREDETERMINED ARC WITH EACH OPERATION OF SAID PUNCH PRESS; (G) AND MEANS FOR ACTUATING SAID PUSH BAR ON INDEXING SAID BLANK THROUGH A COMPLETE CIRCLE TO RELEASE SAID BLANK.

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