US1407869A - Drawing press - Google Patents

Description

W. KLOCKE.

DRAWING PRESS.

APPLICATION FILED APR 9, I920. 1,407,8 9, Patented Feb. 28, 1922.

i 2 SHEETS-SHEET I.

Fey. 1.

I I I INVENTOR By Attorneys,

W. KLOCKE.

DRAWING PRESS. APPLICATION FILED APR. 9, 1920.

2 SHEETSSHEET 2.

BL/INK HOLDER SLIDE INVENTOR By Attorneys,

UNITED STATES PATENT OFF-ICE.

WILLIAM KLOCKE, OF WOODI-IAVEN, NEW YORK, ASSIGNOR TOE. W- IBLISS COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF WEST VIRGINIA.

DRAWING PRESS.

Specification of Letters Patent.

Patented Feb. 28, 1922.

To all whom it may concern:

Be it known that I, WILLIAM KLOCKE, a citizen of the United States of America, residing in Woodhaven, in the borough and county of Queens, city and State of New York, have invented certain new and useful Improvements in Drawing Presses, of which the following is a specification.

This invention relates to improvements in drawing presses and aims to provide improvements therein.

The present invention provides a drawing press of simple and compact construction, and having-a good disposition of the driving forces to the connections which transmit the driving forces to the moving parts of the press.

It further provides a drawing press in which slides, as a part ofthe driving connections, may be eliminated, the driving force. being applied through links and mechanical parts having a turning movement around an axis.

The invention further provides a drawing press wherein the connections between the punch and the reciprocatory slide, carrying the die, .(or the blank holder), and the arrangement of such connections, is such that the punch acts as a balance for the slide, or vice versa.

The invention further provides a novel combination and arrangement, and sub-combinations of parts, hereinafter more fully set forth for carrying out the purposes of the invention. An embodiment of the invention is illustrated inthe accompanying drawings.

In said drawings,

Figure 1 is a side view of a drawing press, partly in section, embodying the present invention.

Fig. 2 is a view similar to Fig. 1, showing the press parts in position different from that in Fig. 1, the full lines showing the parts in the position which they occupy when the punch is at the end of its working stroke; the dot and dash line showing the parts in the position which they occupy when the blank-holder slide is withdrawn to its maximum extent.

Fig. 3 is a diagram illustrating the movements of the punch and reciprocatory slide. Referring to said drawings, numeral designates a punch, and 11 a slide carrying a die or blank holder, as the case may be,-

here being shown as a die 12. Numeral 13 designates the blank holder, which may be, and 1s here shown as, fixed to the frame of the press.

The slide 11 and the punch 10 are driven in a suitable manner, either from separate parts or as here shown, from the same part, as for example a crank pin 15. A connecting rod 17 may serve to connect the crank pin with the punch 10 through a slide or crosshead 19.

The press conveniently has the driving force applied thereto through the rotary shaft 21, the crank pin 15 being convenient- 1y attached to a disk or gear 22 fixed to said shaft 21.

Numeral 25 designates one or more rockshafts, oi" equivalent parts, such as crank disks, bell cranks or the like, adapted, in COIIJHHCtlOII with suitable connections 26, to reciprocate the slide 11. These connections preferably comprise a toggle or to gles, comprising a link 28 connected at one end to the slide 11, and an arm 29 fixed upon the rock-shaft 25.

Numeral 3O designates a second rock-shaft or equivalent device such as a crank disk or hell crank lever having armsor the equivalent 31, 32, one arm, as for example the arm 31 being connected to the crank pin 15 by means of a link 35. The other arm 32 of the rock-shaft is connected to a rockshaft 25 by means of a link 37 and an arm 39 fixed on said rock-shaft 25. A link 40 serves to connect an arm 39 on one rock-shaft 25, with another arm on another rock-shaft 25, where more than one rock-shaft 25 is employed, the arrangement being such as to secure uniform movement of the slide 11 at each side, The arms 32 and 37 const tute a toggle 43.

The arrangement of the connections between the slide 11 and the crank pin 15 is such as to secure a dwell of said slide during the active part of thestroke of the punch 10, which active part may be agreater or less part of its movement toward the die.

The axis of the crank 15 is located so that, in the extended position of the toggle 43, the link'35 stands at an angle of approximately 90 to the arm 31. This arrangement provides the minimum oscillation of the arm 31 (consequently a minimum movement of the toggles 4.3 and 26) for a movement of the crank 15 through a considerable part of its circular movement, as for example through about 90, thereby providing for a relative dwell of considerable duration of the slide 11. This arrangement provides a good disposition of the parts as regards the application of the forces. The thrust of the crank through the connecting rod 35 is substantially at rightangles to the arm 31, and the toggles 26 and 43 are substantially'straight, and hence in a position where the mechanical advantage is greatly on the side of the actuating forces, and against the reactive forces.

The angular relation of the arms 31 and 32 is not important as the axis of the crank 15 could be changed to conform to the relation of the arm 31. Where, however, the connecting rod 17 is also connected to the crank 15, the arms 31 and 32 should be approximately at right-angles to one another. By this arrangement the punch makes a rapid advance toward and against the blank during the time when the connections produce a dwell of the slide 11, and by suitably adjusting the axis of the shaft 21 to the axis of the rock-shaft 30, the dwell of the slide may be made to continue until the crank pin 15 reaches a position in its circle where the punch is advanced to the maximum extent. This latter effect is accomplished by locating the axis of the shaft 21 somewhat to one side of a horizontal line drawn at the jointed end of the arm 31. It will be seen by reference to Fig. 1 of the drawing that the link 35 has symmetrical positions at positions shown by the two dotted lines, and hence that the part of the movement of the crank pin 15 which corresponds with the period of dwell of the slide 11 approaches close to the 270 position in its circle of movement, corresponding to the most advanced position of the unch.

\Vhere the connecting rods 1 and 35 are connected to the same crank, it is preferable to locate the crank-shaft 21 in the midplane of the press, inasmuch as the crank acts to pull Or push the punch most nearly in line with its stroke.

Moreover, it will be seen that by the present invention, it is possible to arrange the actuating mechanisms of the slide and punch in proximity to one another, so that the press is compact.

Moreover, it will be readily understood that the positions and direction of movement of the slide and the punch may be readily changed. A press with an overhead drive and slide may be provided by simply inverting the parts, and an illustration of such is had by simply inverting Fig. 1. Moreover, where the punch is driven independently of the crank 15 to which the rod 35 is connected, the working stroke of the punch may be made to take place either in the direction of movement of the slide 11 or contrariwise. It is preferable, however, to have the punch move in an opposite manner to the slide 11, as the punch may thereby be made to serve as a counter-weight for the slide.

Operation: The movements of the punch and slide, and the relation of such movements are most clearly shown in the accompanying diagram, Fig. 3. y

In the position of the part shown in Fig. 1, the punch is shown as being upon its working stroke, and the slide 11 with the die 12 thereon as being in position to hold the blank against the blank-holder for the drawing operation. As shown, the punch is arranged to strike the blank in the 180 position of the crank, and continues to draw the blank until the crank reaches, or nearly reaches its 270 position. Where the arrangement of the parts is such that the slide operating mechanism begins to move the slide 11 prior to the completion of the working stroke of the punch 10, the drawing action will stop at a point where the punch and slide begin to move together at the same speed. (See the full line position of the parts Fig. 2.)

In the example shown, the slide remains substantially still from about the 150 position of the crank 15 to about the 240 position of the crank. The toggles 26 and 43 are extended or straight at the 160 and 230 positions of the crank pin, and between these positions, and slightly to either side thereof, the oscillation of the rock-shaft 30 is comparatively slight, not sufficient to effect the toggles 43 and 26 sufiiciently to move the slide 11 to any comparative or objectionable extent.

At or about the same time that the punch 1.0 reaches the end of its working stroke, corresponding to the 270 position of the crank in Fig. 1, the slide 11 begins to retire from its holding position, the retiring movement being at first gradual and thereafter accelerated, the slide being most widely separated from the blank-holder 13 when the crank pin 15 is in a position of about 20. The position of the connecting parts in this position is shown by the dot and dash lines on Fig. 2. The return movement of the slide 11 is relatively uick, the motion, however. being complete with a gradual retardation, this returnmovement of the slide occurring between the 20 position of the crank 15, and the 150 position thereof;

Moreover, it will be seen, where the punch and slide are connected to the same actuat- I ingpart, that the slide 11 counter-balances the punch on its back stroke, as for example from the 270 position of the crank 15 to the 20 position. While from the 20 position to the position the slide does not act to counter-balance the punch, nevertheless, the parts between this part of the movement have considerable momentum, so that the counter-balancing effect during this part of the motion is not so important. During the initial part of the downward movement of the punch 10, it will act to counter-balance the slide during its approach to holding position. In the example shown, this counterbalancing of the slide would occur from the 90 position to about the 150 position of the crank 15.

If the punch and slide were reversed, the counter-balancing effects would be the reverse of those just described; that is the punch would counter-balance the slide during the upward movement of the slide, and the slide would counter-balance the punch during the upward movement of the punch.

The inventive ideas herein set forth may receive other embodiments and mechanical expressions than those herein specifically illustrated 'and described.

What I claim is r l. A drawing press comprising a punch, and a die or blank-holder carrying slide, adapted to reciprocate in opposite directions, and a driving part for said reciprocatory press parts, said driving part being on the side of said slide opposite said punch, connections between said driving part and said reciprocatory press parts, one of said reciprocatory parts being adapted to act through its connections upon said driving means in a direction to counter-act the resistance on said driving means on the other re'biprocatory part, due to its weight, said first named part thereby acting as a counterweight for said other part.

2. A drawing press comprising a punch, and a die or blank-holder carrying slide, adapted to reciprocate in opposite directions, and a driving part for said reciprocatory press parts, said driving part being on the side of said slide opposite said punch, connections between said driving part and said reciprocatory press'parts, one of said reciprocatory parts being adapted to act through its connections upon said driving means in a direction to counter-act the resistance on said driving means on the other reciprocatory part, due to its weight, said first named part thereby acting as a counter-weight for said other part, said connection between said slide and said driving part comprising a toggle, whereby said slide is adapted to dwell during part of its movement.

3. A drawing press comprising a punch, and a die or blank-holder carrying slide, adapted to reciprocate in opposite directions, and a driving part for said reciprocatory press parts, said driving part being on the side of said slide opposite said punch, connections between said driving part and said reciprocatory press parts, one of said reciprocatory parts being adapted to act through its connections upon said driving means in a direction to counter-act the resistance on said driving means on the other reciprocatory part, due to its weight, said first named part thereby acting as a counter-weight for said other part, the connection between said slide and said driving means comprising a pair of toggles at substantially right-angles to one another whereby said slide is adapted to dwell during part of its movement.

4. A drawing press comprising a punch, and a die'or blank-holder carrying slide, adapted to reciprocate in opposite directions, and a driving part for said reciprocatory press parts, connections between said driving part and said reciprocatory press parts, one of said reciprocatory parts being adapted to act through its connections'upon said driving means in a direction to counter-act the resistance on said driving means of the other reciprocatory part, due to its weight, said first named part thereby acting as a counter-weight, for said other part, said driving part comprising a crank, and the connection between said slide and crank comprising a rock-shaft having an arm thereon, a link connected to said crank and arm, a second rock-shaft having connections with said slide, and a toggle between said first and second rock-shafts.

5. A drawing press comprising a punch, and a die or blank-holder carrying slide, adapted to reciprocate in opposite directions, and a driving part'for said reciprocatory press parts, connections between said driving part and said reciprocatory press parts, one of said reciprocatory parts being adapted to act through its connections upon said driving means in a direction to counteract the resistance on'said driving means of the other reciprocatory part, due to its weight, said first named part thereby acting as a counter-weight for said other part, said driving part comprising a crank, and the connection between said slide and crank comprising a rock-shaft having an arm thereon, a link connected to said crank and arm, and a plurality of rock-shafts connected to said slide, a link connection be-- tween said plurality of rock-shafts adapted to move the rock-shafts in unison, and a toggle connection between said first named rock-shaft and said plurality of rock-shafts.

6. A drawing press comprising a punch, and a die or blank-holder carrying slide. adapted to reciprocate in opposite directions, and a driving part for said reciprocatory pressparts, connections between said driving part and said reciprocatory press parts.

one of said reciprocatory parts being adapted first named part thereby acting as a counterweight for said other part, said driving part comprising a crank, and the connection between said slide and crank comprising a rock-shaft having an arm thereon, a link connected to said crank and arm, a second rockshaft having connections with said slide, and a toggle between said first and second rockshafts, said connection of said punch comprising a connecting rod attached to said crank.

7. A drawing press comprising a reciprocatory slide adapted to carry a blank-holder or die, a rock-shaft, connections between said slide and said rock-shaft, and means for operating said rock-shaft, said means comprising a rock-shaft having a toggle connection with said first named rock-shaft, a driving crank, an arm on said second named rockshaft, and a link connecting said arm to said crank, the center of said crank bein so located that said link and said arm on said second named rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rock-shafts.

8. A drawing press comprising a reci r0- catory slide adapted to carry a blank-ho der or die, a rock-shaft, connections between said slide and said rock-shaft,and means for oper ating said rock-shaft, said means comprisin a rock-shaft having a toggle connection wit said first named rock-shaft, a driving crank, an arm on said second named rock-shaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named. rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rockshafts, said crank having its axis of rotation in approximately the center plane of the press.

9. A drawing press comprising a reci rocatory slide adapted to carry ablank-ho der or die, a rock-shaft, connections between said slide and said rock-shaft, and means for operating said rock-shaft, said means comprising a rock-shaft having a to gle connection with said first named rock-sfiaft, a driving crank, an arm on said second named rockshaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rock-shafts, the axis of rotation of crank being so located that said crank, in its lowest position is close to a position of said crank where said toggle is fully extended.

10. A drawing press comprisin a reciprocatory slide adapted to carry a b ank-holder or die, a rock-shaft, connections between said slide and said rock-shaft, and means for operating said rock-shaft, said means comprising a rock-shaft having a toggle connection with said first named rock-shaft, a driving crank, an arm on said second named rock-shaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rock-shafts, the axis of rotation of said crank being so located that said crank in the position thereof in which said toggle is fully extended, is closer to the lowest position of said crank than to the highest position thereof.

11. A drawing press comprising a reciprocatory slide adapted to carry a blank-holder or die, a rock-shaft, connections between said slide and said rock-shaft, and means for operating said rock-shaft, said means comprising a rock-shaft having a toggle connection with said first named rock-shaft, a driving crank, an arm on said second named rockshaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rockshafts, said crank having its axis of rotation in approximately the center plane of the press, and a punch actuated by a crank motion substantially in unison with the motion of said driving crank.

12. A drawing press comprising a reciprocatory slide adapted to carry a blank-holder or die, a rock-shaft, connections between said slide and said rock-shaft, and means for operating said rock-shaft',-said means comprising a rock-shaft having a-toggle connection with said first named rock-shaft, a driving crank, an arm on said second named rockshaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named rock-shaft are approximately at right-angles to one another in the extended position of said toggle between said rockshafts,-the axis of rotation of crank being so located that said crank, in its lowest position is close to a position of said crank where said toggle is fully extended, and a punch actuated by a crank motion substantially in unison with the motion of said driving crank.

13. A drawing press comprising a reci rocatory slide adapted to carry a blank-ho der or die, a rockshaft, connections between said slide and said rock-shaft, and means for operating sai rock-shaft, said means comprisin a rock-shaft having a toggle connection with said first named rock-shaft, a driving crank, an arm on said second named rock-shaft, and a link connecting said arm to said crank, the center of said crank being so located that said link and said arm on said second named rock-shaft are approximately at right angles to One another in the extend ed position of said toggle between said rockshafts, the axis of rotation of said crank be ing so located that said crank in the position thereof in which said toggle is fully extended, is closer to the lowest position of said crank than to the. highest position thereof, and a punch actuated by a crank motion substantially in unison with the motion of said driving crank.

14. A ress comprising a blank-holder or die carrylng slide, and means for reciprocating the same, said means comprising three serially connected rocking parts, a rotary part, a link between said rotary part and one of said rocking parts for rocking the same and separate connections between each of said other rocking parts and said slide.

15. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising three serially connected rocking parts, a rotary part, a link betweensaid rotary part and one of said rocking parts for rocking the same,

i said rocking parts being connected by a toggle and separate connections between each of said other rocking partswand said slide.

16. A press comprising a. blank-holder or die carrying slide, and means for reciprocating the same, said means comprising three serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, a toggle connecting said lastnamed rocking part and the next rocking part in the series, and a toggle connecting said slide and each of the last two rock shaftsin the series.

17. A press comprising a blank-holder or die carrylng slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a. link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, said rotary part having an eccentric part to which said link is connected, said eccentric part being arranged to turn through that part of its movement which is substantially across the line of reciprocation of said link, when the pivots of said toggle are substantially in alinement.

18. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, said rotary part having an eccentric part to which said link is connected, said eccentric part being arranged to turn through that part of its movement which is substantially across the line of reciprocation of said link, when the pivots of said toggle are substantially in alinement,

and a toggle connecting said slide and a rock-shaft, said latter toggle having its pivots in alinement simultaneously with the alinement of the pivots of the first-mentioned toggle. 1

19. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rotary part and rocking parts being on the same side of said slide.

20. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a retary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, said rotary part and rocking parts being on the same side of said slide.

21. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, and a toggle connecting said slide and a rock-shaft, said rotary part and rocking parts being on the same side of said slide.

22.v A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, said rotary part having an eccentric part to which said link is connected, said eccentric part being arranged to turn through that part of its movement which is substantially across the line of reciprocation of said link, when the pivots of said toggle are substantially in alinement, said rotary part and rocking parts being on the same side of said slide.

23. A press comprising a blank-holder or die carrying slide, and means for rec procating the same, said means comprising three serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, and separate connections between each of the other two rocking parts and said slide, said rocking partsand rotary part having parallel axes.

24. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocldng parts for rocking the same, said rocking parts being connected by a toggle, said rotary part having an eccentric part to which said link is connected, said eccentric part being arranged to turn through that part of its movement which is substantially across the line of reci rocation of said link, when the pivots of said toggle are substantially in alinement, said rocking parts and rotary part having parallel axes.

25. A press comprising a blank-holder or die carrying slide, and means for reciprocatin the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rotary part and rocking parts bein on the same side of said slide, said rocklng parts and rotary part having parallel axes.

26. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising two serially connected rocking parts, a rotary part, and a link between said rotary part and one of said rocking parts for rocking the same, said rocking parts being connected by a toggle, said rotary part having an eccentric part to which said link is connected, said eccentric part being arranged'to turn through that part of its movement which is substantially across the line of reciprocation of said link, when the pivots of said toggle are substantially in alinement, said rotary part and rocking parts bein on the same side of said slide, said rocklng parts and rotary part having parallel axes.

27. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising a pair of rocking parts, separate connections between said slide and each of said rocking parts, a driving connection between said rocking parts, another rockin part in serial connection with one of sald first-named rocking parts, and means connected to said other rocking part for rocking the connected pair.

28. A press comprising a blank-holder or die carrying slide, and means for reciprocating the same, said means comprising a pair of rockin parts, separate connections between said sfide and each of said rocking parts, a driving connection between said rocking parts, another rockin part in serial connection with one of sald first-named rocking parts, and means connected to said other rocking part for rocking the connected pair, said latter means comprising a rotary part having an eccentric part thereon, and a link connecting said other rocking part and said eccentric part.

blank-holder or 29. A press comprising a die carrylng slide, and means for reciprocating the same, said means comprlsing a pair of rocking parts, connections between said slide and rocking parts, a driving connection between said rocking parts, another rocking part in serial connection with one of said first-named rocking parts, a toggle connecting said other rocking part and the one rocking part to which it is connected, and means connectedto said other rockin part for rocking the connected pair, sai latter means comprising a rotary part having an eccentric part thereon, and a link connecting said other rocking part and said eccentric part, said eccentric part being arranged to turn through that part of its movement which is substantially across the line of reciprocation of said link, when the pivots of said toggle are substantially in alinement. In witness whereof, I have hereunto signed my name.

. WILLIAM KLOCKE.

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