US2442901A - Material working apparatus - Google Patents

Description

June 8, 1948.

A. M. MISSBACH MATERIAL WORKING APPARATUS Filed Aug. 9, 1945 3 Sheets-Sheet 2 70 SUCTION m/z/i/vm? A M lid/558A CW June 8, 1948. A. M. MISSBACH MATERIAL WORKING APPARATUS 3 Sheets-Sheet 3 Filed Aug. 9, 1945 I I 'i A. M M/S'SBACH 5/144 [.41 4

Patented June 8, 1948 S OFF 'I'ICE.

MATERIALWORKING APPARATUS Arthur M, Missliaeh, Riverside, 111., assignor to Western Electric. Company, Incorporated, New York, N, Y., a. corporation of New York Application August 9, 1945,.Seria1 No. 609,879

13. Claims.

This invention relates. to material working apparatus and more particularly to punch and die apparatus for perforating and trimming terminals projecting laterally from electrical resist'ors;

The invention is particularly usefulin perforating'an-dtrimming fiat type terminals projecting laterally-"from ceramic coated electrical resistors following the'steps in the method ofmanufacturing resistors disclosed in application; Serial No. 605,133, filed July 14, 19.45,.n0w U. S. Patent No; 2,427,417, granted September '16; 1947, to A. J. Prickett, which includes the step ofremoving from opposite fiat surfaces of the terminals a ceramic-coating which had. been applied thereto to prevent'oxidation of the surfaces of the-terminal'sjduring the firing of theceramic coating material: Generally, upon completion of the referred-to method, some ceramic coating re-- mains on the edges of the projecting terminals, which still have to be-rounded 01f at their outer ends and perforated so. thatwire maybethreaded through the hole andsoldered-connections made;

An object'of'the present invention is to provide an efiicient' and practicable apparatusfor workingthe above-referred-to" terminal while attachedto theresistor, whereby it is simultaneouslyperforated and trimmed around its edge to remove any ceramic coating thereon and its outer end roundedwflf;

In attaining this object, there is provided, in one embodiment of' the invention, cooperating fixed and movable punch and die members for working the terminal while attached to the resistor, a resiliently mounted element substantially surrounding; thefixed punch and normally positioned thereabove and shaped to formmeans for" laterally guiding aterminal into position against" astop member thereon for workingand; in cooperation with the fixed punch, anest'for supporting; theterminal during" its working: A movable air-exhaust duct carriedby the resiliently mounted terminal guide and-nesting element is reciprocativeupon a stationary-air exhaust duct,

whereby the two ductsare atall times in communicaticn; the inlet of the movable duct being arrangedand effective to constantlydraw from the apparatusall materials trimmed: from the edges of-the terminal. airexhaust duct, an air blast is connectedto'andpasses through the fixed punch, which iseffective to; cause" a heavier end" portion, trimmed off the-terminal,- torbe'liftedfoffithefiired-punch and carriedaway-by the airexhaust'system:

Gther objects and advantages 'ofthisinvention- In cooperation with the will'inore fullyappear from the'following detailed description, taken in conjunction with the ac-- companying drawings, wherein Fig. 1 is a fragmentary irregular vertical sectional View taken on. the line |l as Fig.

through the 1 punch and dieapparatusembodyingthe-present'invention, the-apparatus being shown in its normal positionwith a cross 'section'of a terminal nested thereon ready to be--worked;

Fig. 2 is a fragmentary vertical sectionalview, partly in elevation, taken on the line 2"2"of F-ig 4, the apparatus being shown inits normal position, similarto-that of Fig. 1-;

Fig. -3is a fragmentary'vertical sectional view, similar to Fig. l, show-ing the apparatus in afully operated position and before the retraction of the movable die;

Fig. 4-' isapl aniview, partly in section, taken on theline 4-42of Fig'. '1' 'ofifthat por-tion' dfthe-app'aratus situated belowthe movable die; and

Fig. 5isa-plan View of one-type or electrical resistor illustrating-its terminals at opposite ends before and afterbeing worked upon ey the-apparatus-of this invention.

As illustrated in the drawings, the punch and die apparatus embodying thefeatures of this invention is operativel'y connected toa punch press, which may be of any usual type. Since it is not essentialt'o a complete understanding of the invention, the punch-press has not beenillustrated, except those parts directly concerned with this invention, which consist, of the following: A

vertically reciprocative ramand a stationary bed Ill and H, respectively- (Fig. 1)". Fiiied tothetop face-of the bedl-isa bolster plate t2; towhich are amxed guide posts I3- that extend into apertures Mina reciprocative die andpunch'headi5.

Secured to thetop face of'tliebolster plate 12 1's a punch l6, whichgin the operation of the-appara! tus; cooperates with a die I? fixed. to-and 'depending from the bottom face of the-die and punch head I5; which secured to and reciprocateswith the ram i5= to worka terminal 18 projecting laterally fromthe resistor 20 (Figs. 2, 4 a'nd 5)-. Surrounding and reciprocative-on= the upper vertical end of thefixed punch i6" is a resiliently mounted terminal guide --and nesting member '21, which is-guidedin its move;-

ments by a pair of guidepins 2 2 (Fig. 4-) securedtoand depending from the nestingmember 2i and at their lower-endsslidably fitted in apex tures- 23 in the bolster plate l2 The nesting member" 2-! is resiliently supported" in its upper normal position, as shownin Fig; 1', by a plurality of" compression springs 24, bearing at opposite ends on opposed faces of the member 2| and the bolster plate l2 and surrounding headed screws 25 secured to and depending from the member 2|. Downwardly facing shoulders 23 are formed in the lower ends of apertures 21 in the bolster plate l2, in which the headed screws reciprocate, and against which the inner annular faces of the screw heads abut to limit the upward movement of the nesting member 2| to its normal position (Figs. 1 and 2).

It will be observed, referring to Figs. 1 and 2, that the member 2|, when in its normal upper position, is above the upper face of the fixed punch Hi, the distance being suitably greater than the thickness of the terminal l8 to be worked. This arrangement results from an upwardly extending rectangularly shaped portion 29 of the member 2| being formed with a horizontal irregularly shaped slot 30 in its upper face, which extends completely thereacross. The forward end of the member 2| and its upper portion 29, as viewed in Fig. 4, and the left end thereof, as viewed in Fig. 2, is formed with a vertical slot 3| which intercepts the slot 30 and in which the upper end of the fixed punch l5 freely fits. In the normal position of the member 2| (Figs. 1 and 2), the upper face of the fixed punch l6 lies in the plane of the bottom face of the slot 30. Thus, the vertical walls of the slots 30 and 3|, in cooperation with the upper horizontal face of the punch I3 and the bottom face of the slot 30, provide a guide and nest for receiving the terminal l8 to be worked. A stop member 32 fixed to the member 2| and extending into the slot 30 serves to definitely position the terminal l8 longitudinally in the slot 3|). As the terminal I8 is inserted into position, its outer end edge, which is square before being worked upon, abuts the stop member 32.

Carried by the resiliently mounted guiding and nesting member 2| is an air exhaust duct 35 (Figs. 2 and 4), having a tapered aperture 33 therein. At its smaller end, the walls of the aperture 35 are aligned with a tapered portion 3'! of the slot 30 in the member 2| and the larger end of the aperture is at all times in communication with an aperture 38 in a stationary air exhaust duct 39 fixed to the bolster plate l2, which is connected to a suitable source of constant air suction (not shown). This air exhaust system serves to draw from the punch and die members l6 and I! all ceramic and other materials trimmed from the edges of the terminal l8. Cooperating guideways and guides 42 and 43 on the ducts Y35 and 39, respectively, serve to minimize air leakage between the ducts as the duct 35 is guided up and down on the duct 39 in the operation of the apparatus. Fixed in a shouldered aperture 44 (Fig. 2) in the member 2| is one end of a tube 45 having its opposite end slidably fitted in an aperture 46 in the stationary pun-ch IS. The aperture 46, at its lower end, communicates, by means of suitably arranged apertures 49 and 50, in the bolster plate !2, with a hose or pipe 5|, which is connected to a suitable source of air pressure (not shown). A blast of air may thus be directed upwardly at a point in front of the stop member 32 and directly under a relatively heavy portion trimmed from the end of the terminal in providing the terminal with a rounded outer end. This blast of air is preferably intermittent, and controlled by means (not shown) from the movements of the ram I0, whereby, as the upper movable die I1 is retracted, the trimmed end portion of the terminal I8 is lifted from the punch I6 and above the stop member 32 whereat, by the action of the air exhaust,

4 it will be carried away through the ducts 35 and 39 along with all ceramic and other materials trimmed from the edges of the terminal.

Reciprocative in a die aperture 52 of the die is a spring-pressed shouldered shedder 53, which, in the normal retracted position of the die I! (Figs. 1 and 2) is pressed downwardly to its advanced position with its lower face in the plane of the lower face of the die by a pair of push pins 56 slidable through apertures in a pair of abutting plates 51 and 58 carried in shouldered recesses in the die I1 and the die and punch head l5, respectively. The push pins 56 are normally maintained in their lowered position, as shown in Figs. 1 and 2, by a backing plate 59 acted upon by a compression spring 60, the plate and spring being free to move in an aperture in the head l5. Carried in apertures in the shedder 53 and plate 51 is a shouldered perforator 63, which cooperates with a die aperture 64 in the fixed punch Hi to punch an aperture 65 (Fig. 5) in the terminal i8 simultaneously with the trimming of the terminal by the coaction of the die aperture 52 of the upper die I! with the fixed lower punch I3. Suitable apertures are provided in the punch l6, bolster plate I2 and press bed I I through which the punchings resulting in the aperture 35 are removed. It is to be understood that the dimensions of and clearances between the edges of the die aperture 52 and punch l6 are such that, in the downward stroke of the upper die ll, the metal of the terminal l8, at its free outer end, is sheared off to provide a rounded end and any ceramic and other materials on the edges of the terminal are trimmed away without appreciably trimming the metal thereat.

Extending upwardly from and fixed to the bolster plate I2 is a combined terminal guide and guard member 65 for the space between the cooperating punch and die members l6 and 1 (Figs. 2 and 4), which is slotted, as indicated at 61, in line with the slot 30 in the resiliently mounted terminal nesting member 2|, the dimensions of the slot 61 and its arrangement being such that the terminal may be freely inserted into the nesting slot 30 and against the stop member 32, where it rests on top of the fixed punch I6. Also formed in the member 36 at each side and aligned therewith are two slots 68 for receiving terminals on the resistor 20 other than the one terminal thereof to be worked, the arrangement of the slots 61 and 68 being such that resistors of different types and having more than one pair of terminals may have their terminals 8 worked upon.

In the operation of the punch and die apparatus, above described, a resistor 20, having a pair or more of laterally projecting terminals I8, is placed in position with one of its terminals inserted through the guide slot 61 in the guard member 65, with its outer end edge abutting the stop member 32, as clearly shown in Figs. 2 and 4. Thereafter, the'ram I0 is caused, in a usual manner, to descend to the position shown in Fig. 3. In this movement of the ram I0, the lower face of the die carried thereby engages the upper face of the resiliently mounted terminal nesting member 2| and depresses it against the action of the springs 24. Thus, the outer free end of the terminal I8 is rounded off and any ceramic material on the opposed edges of the terminal is trimmed off by the coaction of the edges of the die aperture 52 of the movable die H with those of the fixed punch I6 as the movable die moves below the plane of the upper end face of the punch, as shown in Fig. 3. Simultaneously with'this forming and'trimming movement of the'die H, the lower faces of the perfora'tor "63 and the 'sh'edd'er '53 are moved into engagement with'th'e'upper face of'the terminal l8 remaining in a fixed position and as thepe'rforator 63, whichis fixed to and moves with-the di'e 'll, continues its movement to perforate'the terminal, the shedder recedes into the "die 11 against the action of the springfiil to thepo'sitio'n shown'in-Fig. 3. As the ram! [1 again'asoends to'its'normal'position (Figs. 1 and2), the springpr'ess'ed nesting'member 2| also moves upwardly to its normal position, limited by the headed screws engaging the shoulders 260i" the apertitles '21. Also during this latter movement of the no, the spring-pressed shedd'er 53 retur'n's to its normal position relative to the die 'fl, thus leaving the portion of the terminal [a sheared olT in forming its free outer rounded end lying-on the upper face of the fixed punchlB, at which instant a blast of air directed through the aperture 44, in the manner previously described, lifts the'sheared-off portion of the terminal above the stop'member 32, whereupon it is carried away along with the ceramic and other particles trimmed from the terminal by the action of the air in the air exhaust system. It is to be noted that in 'theoperative position of thedie I T (Fig. 3), wherein it abuts the upper face of the member 2l,'the slot is closed and sealed across its top by the die ll, which serves to increase the effectiveness of the air exhaust system in removing ceramic and other particles from the'apparatus.

What is claimed is:

1. In an article working apparatus, a stationary support, a fixed punch mounted thereon, an element so constructed and arranged relative to and cooperating with said punch to form a nest for receiving and supporting an article movable longitudinally thereinto prior to the tools action, means for yieldably maintaining said element in a normal position relative to said punch to form said nest, a movable ram, and a die carried by said ram and cooperating with said punch to work the nested article.

2. In an article working apparatus, a stationary support, a fixed punch mounted thereon, an element substantially surrounding said punch, means for yieldably maintaining said element in a normal position relative to said punch to form, in cooperation with said punch, a nest for receiving and supporting an article movable longitudinally thereinto prior to the tool's action, a movable ram, and a die carried by said ram and cooperating with said punch to Work the nested article.

3. In an article working apparatus, a stationary support, a fixed punch mounted thereon, an element substantially surrounding said punch, means for yieldably maintaining said element in a normal position relative to said punch to form, in cooperation with said punch, a nest for receiving and supporting an article movable longitudinally thereinto prior to the tool's action, a movable ram, and a die carried by said ram eilective during its operative movement to cause movement of said element to permit the die, in cooperation with said punch, to work the nested article.

4. In an article Working apparatus, a st tionary support, a fixed punch mounted thereon, an element so constructed and arranged relative to and cooperating with said punch to form a nest for receiving and supporting an article movans longitudinally 'thereinto, I a stop member said element for "limiting the longitudinal'movement of the article into said nest, in ans fdr yieldably maintainingsaid elment' in a'norfnal position relative "to said-punch to fo-rm said host, a movable ram, and a diecarriedfb'y 'said ram cooperating with said punch to work the -'nested article.

5. In an article working apparatus, a are tionary support, a fix'ed'punch mounted therbn, anelement extendingaroun'd a-plurality of sides ofsaid 'punch and havinga' slot extending'tr nsverselythereonsaid slot-beingo'p'en at one f saidphnchjmeahs for yieldabl'y maintaining d element in a normal position relative to said punch to -form I a nest for receiving and supporting an article movable longitudinally the'reliito, a movable ram,-"andjadie carried' by'saidranl-antl cooperatin with said punch to work the nested article.

-6. In an article working "app'a'ratus, a stationary base, a, fixed punch inou'n'te'd -th'er'eon, an element extending around a plurality or "sides of said punch and having a slot open at each eiid extending-transversely of said punchin 'n' s for resiliently elevating saidelement to a n-dnnai pe sition above said punch whereby 'saicl =sl5t ahd an upper end face of said punhforrn forde'ceiving and supporting anartielea rain,'and adie carried b'y said ram and-ecopeeating with said punch to work tnenestea article.

'7. In anartiele'workingapparatus, a 'stati-onary base, a 'fi xe'd punch mou nt'ed thereon, eiement extending around a plurality of s'ides (if said punch and having -'a slot eaten-ding transversel'y thereof, said slot being open at {one side of said punch, means for resiliently eieva said element to a normal position above punch to for-In a nest forreceiving and-supporting an article movable mecca-many thereiiito, a movable ra-in, and a 'diecarried by'said ram for engaging and moving, during its operative movement, said element to permit the die, in cooperation with said punch, to work the nested article.

8. In an article working apparatus, a stationary support, a fixed punch mounted thereon, an element so constructed and arranged relative to and cooperating with said punch to form a nest open at opposite ends for receiving and supporting an article movable longitudinally thereinto from one end of said nest, means for yieldably maintaining said element in a normal position relative to said punch to form said nest, an air exhaust duct carried by said element communieating with said nest, a stationary air exhaust duct cooperating with said first duct and in constant communication therewith through which all waste material resulting from the working of the article is sucked, a movable ram, and a die carried by said ram and cooperating with said punch to work the article.

9. In an article working apparatus, a stationary base, a fixed punch mounted thereon, an element substantially surrounding said punch and having a recess extending across its upper face in alignment with said punch for receiving and supporting, in cooperation with said punch, an article movable longitudinally thereinto, means for resiliently elevating said element to a normal position above said punch to receive in said slot an article, an air exhaust duct carried by said element and communicating with said slot, a stationary air exhaust duct upon which said first duct reciprocates and in constant communication therewith through which all waste material resulting from the working of an article is sucked by air, said ducts having cooperating guideways and guides, a movable ram,'and a die carried by said ram and cooperating with said punch to work the article, said die during its operative movement being arranged to engage the upper face of said element to depress the same and to close the slot thereof across its top, thus increasing the effectiveness of the air exhaust through said ducts.

10. In an article trimming and working apparatus, a stationary base, a fixed punch mounted thereon, an element so constructed and arranged relative to and cooperating with said punch to form a nest open at opposite ends for receiving and supporting an article movable longitudinally thereinto from one end of said nest, means for resiliently elevating said element to a normal position relative to said punch to form said nest, an air exhaust duct carried by said element communicating with said nest, a stationary air exhaust duct cooperating with said first duct and in constant communication therewith through which all waste material resulting from the working of the article is sucked by air, said punch having formed therein a, channel through which a blast of air is directed to blow waste material therefrom whereby it may be sucked by air through said ducts, a movable ram, and a die carried by said ram and cooperating with said punch to work the article.

11. In an article Working apparatus, a stationary support, a fixed punch mounted thereon, an element so constructed and arranged relative to and cooperating with said punch to form a nest for receiving and supporting an article movable longitudinally thereinto, means for yieldably maintaining said element in a normal position relative to said punch to form said nest, an upper face on said punch to provide a support for the article before it is worked, a movable ram, and

a-die carried by said ram and cooperating with said punch to work the nested article.

12. In an article working apparatus, a stationary support, a fixed punch mounted thereon, an element substantially surrounding said punch, means for yieldably maintaining said element in a normal position relative to said punch to form, in cooperation with said punch, a nest for receiving and supporting an article movable longitudinally thereinto, said element and said punch having surfaces lying in a common plane in the normal position of said element upon which the article is supported, a movable ram, and a die carried by said ram and cooperating with said punch to work the nested article.

13. In an article working apparatus, a stationary. support, a fixed punch mounted thereon, an element substantially surrounding said punch, means for yieldably maintaining said element in a normal position relative to said punch to form, in cooperation with said punch, a nest for receiving and supporting an article movable longitudinally thereinto, said element and said punch having surfaces lying in a common plane in the normal position of said element upon which the article is supported, a movable ram, and a die carried by said ram efiective during its operative movement to cause movement of said element to permit the die, in cooperation with said punch, to work the nested article.

ARTHUR M. MISSBACH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,310,068 Flower July 15, 1919 2,111,156 Schneider Mar. 15, 1938 2,144,684 McClung Jan. 24, 1939

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