US1696622A - Toggle press - Google Patents

Description

EM. 251, 19:28. 1,696fi22 A. A. BYERLEI N TOGGLE PRESS Filed April s, 1926 "7 sheets-sheet i mung;

A. A. BYERLEIN TOGGLE PRESS Filed April s, 1926 '7 Sheets-Sheet 2 A. A. BYERLEIN TOGGLE PRESS Filed April :5, 1926 7 Sheets-Sheet 5 55 5 57 & 6 W l H :17 #7 g J A. A. BYERL lN TOGGLE PRESS Filed April 5, 1926 '7 Sheets-Sheet 4 Yld Dec. 25, 1928. 1,696,622 A. A. BYERLEIN TOGGLE PRESS Filed April 5, 1925 'r SneetsTSheet 6 Patente Dec; 25 1928 warren S T-A TE ARTHUR A. BYEBLEI'N, or nn'rnorr, m rcnraan.

TOGGLE PRESS.

Application filed April 3,1926. Serial No. 99,585.

The present invention relates to drawing presses.

One of the principal objects of the present invention is to provide actuating mechamsm' for the blank holder of a press, which is constructed and arranged to lessen the strain upon the parts, to obtain an even pressure correspondin of the blank holder upon the work, and to secure other advantages hereinafter pointed out. i

Another object of the invention is to provide a drawin press having provisionsfor actuating the blank holder from a single slide actuating member movable in a direction transverse to the direction of movement of the blank holder.

' Other objects and advantages will be apparent from the following description taken in connection with the accompanying drawing in which Fig: 1 is a front elevationof a drawing press embodying the present invention;

Fig. 2 is a side elevation thereof;

Fig. 3 is a rear elevation of the press;

Fig. 4 is a central vertical section taken on the line 4 4 of Fig. 3, showing the parts in raised position; j Fig. 5 is a vertical section similar to Fig. 4 showing the parts in lowered position;

Fig. 6 is a part section on the line 66 of Fig.5;

Fig. 7 is a part section on the line 77 of Fig.--5, some of the parts being shown in Ian; Fig. 8 is a section on the line 8-8 of Fi 5' Figit) is a section on the line 99 of Fig. 5; i d

Figs. 10 and 11 are diagrammatic views of certain linkages;

Fig. 12 is an enlarged section of a detail taken on the line 1212 of. Fig. 7

Fig. 13 is a fragmentary sectional View, to Fig. 5, showing a modified form of mechanism and taken on the line 1313 of Fig. 14;

Fig. 14 is a fragmentary sectional view taken on the line 14-14 of Fig. 13; and

Fig. 15 is a detail sectional view on the line 1515 of Fig. 14.

Referring to the embodiment of the invention illustrated in Figs. 1 to 12, 2O designates the frame of the press which comprises a bed 21, spaced apart uprights or side frames 22 which are adapted to carry the actuating mechanism and to guide the blank holder and plunger for vertical reciprocatory movement and an arch member 23. A blank holder 25 is guided upon guides 26 upon the side frames 22 of the-press, and

.a plunger 27 is guided within the blank holder 25. A rotary actuating shaft 29 is journaleddn the side frame 22 above the plunger 27 and is provided with cranks 30 which are connected with the plunger 27 plunger 27 is given a reciprocatory movement within the blank holder 25 upon rotation of the actuating shaft 29.

Means for reciprocating the blank holder 25 in its guides 26 comprises a toggle mecharock levers 42 and the links 43 constitute toggles for. reciprocating the blank holder,

through links or pitmans 31 whereby the '80 -thereof. The rock shafts together with the it being apparent that rotation of the rock shafts 40 and 41 in opposite directions re sults in either raising or lowering the-b ank holder 25 and since all the corresponding parts move simultaneously and through equal distances, the blank holder is raised or lowered without tilting or binding and an even pressure is-obtained upon the work when the blank holder is in its lowered position.

Mechanism is provided for actuating the I rock shafts 40 and 41 and the blank holder 25 from the plunger-actuating crank shaft 29, the arrangement being such as to cause a dwell in the movement of the blank holder when it is in engagement with the work; Such actuating mechanism includes as its principal element a single slide actuatin member 50 which is connected with the mo er shafts 40 and 41, to actuate the same, and

which is itself actuated from the plungeractuating shaft 29. The slide member 50 is supported between the rocker shafts 40 and 41 within a slide housing 51 which guides the slide member for reciprocatory move ment along an obliquely disposed line extending from front to rear of the press, the

line of movement passing above. the front rock shaft 40 and below the rearropk Shaft.

41. This arrangement is best illustrated in Figs. 4' and 5. The slide housing 51 is an elongated tubular member preferably of rectangular cross section, as shown in Fig. 8, and is provided with a flange 52 by which it may be rigidly secured to the arch member 23 of the press, which arch member is cast with an obliquely disposed opening 53 in the mid-plane of the press to receive the housing 51 therein.

Referring particularly to Figs. ,4 to 9, the plunger-actuating shaft 29 is provided with a crank 55, also preferably in the mid-plane of the press, which crank is connected by a connecting rod 56 with rocking sector shaped lever 57 pivotally mounted on pin 58 which isiimmovably fixed in a part 59 connected with the arch 23 of the frame. Rocking lever 57 is connected by another link 60 to a second rocking lever 61 which is mounted on pin 62 which, like pin 58, is immovably fixed in the part 59 carried by the arch 23. The rocking lever 61 is pivotally connected with the slide member 50 by two pairs of links 65 and 66, the links 65 being mounted on the outer ends of pin 67 of rocking lever 61, and the links 66 being mounted upon the outer ends of the pin 68 carried by the rear end of the slide 50. The links and 66 areconnected together by a link pin 70, being mounted on the outer ends of this pin, as best shown in Fig. 7.

The middle part of the link pin 70 be tween the links 66 is of enlarged diameter and is provided with a pair of parallel flat surfaces on opposite sides thereof. This enlarged portion of the link pin 70 is surrounded by a hollow pin or bushing 76 the internal diameter of which is greater than the diameter of the link pin 7 O, which bushing is also provided with a pair of parallel flat surfaces 77 which are adapted to cooperate with the fiat surfaces 75 of the link pin 70, The bushin have"a close sliding t with the surfaces of the link pin 70, and may slide a short distancerelatively to the pin 70 in either direction parallel with the surface 75 and at right angles to the axis of the pin 70. The bushing 76 is carried in the lower end of the forked rock arm 78 extending from rock lever 41 and is held against rotation in the rock arm 78 by keys 79, or other suitable means. The outer surface of the bushing 76 between the forks of the arms 78 is cylindrical and constitutes a bearing for a link 81 pivotally mounted thereon, the other end of said link being pivotally mounted upon the link pinv 68 which is carried by the slide 50. I

The rear toggle rock shaft 41 is thus operativel connected with and driven from the sli e member 50 through the link 81 pivotally mounted at one end upon the pin 68 carried by the slide member 50, and

76 is constructed to.

the entire load for actuating the slide 50 from the plunger-actuating shaft 29 is under greater stress than the linkage connecting the slide 50 with the rear rock shaft 41, and it is to be expected therefore that the running clearance between the links 66 and their cooperatinglink pins 68, 70 is different than the running clearance between the link 81 and its cooperating link pin 68 and bushing 76. This naturally results in relative movement between the axis of the link pin 70 which is in driving connection with the links 65 and 66, and the axis of thebushing 76 which is in driving connection with the link 81 and rock arm 78 of rock shaft 41.

Such relative movement of the pin 70 and the bushing 76 is provided for by the loose sliding connection between these arts. This may be perhaps best understood upon reference to Figs. 10 and 11 which illustrate diagrammatically the linkages above referred to. In Fig. 10, which corresponds to Fig. 4, the linkages are shown in the position'for holding the plunger and the blank holder raised, and in Fig. 11, which corresponds to Fig. 5, the linkages are shown in the positions corresponding with the low ered positions of the plunger and the blanklink pin 70 with it, so that, in the construction here illustrated, the sliding movement between the pin 70 and the rock bushing 7 6 is always in a direction normal to a line connecting the axes of pin 70 and rock shaft 41. 'It isevident from Figs. 10 and 11 that the link pin 70 is free to slide in the bushing 76 and to take a position therein dependent upon the I running clearances between the parts 68, 66, and 70, which clearances may vary from time to time with the varying stresses upon these parts and with wear of these parts. In Fig. 11 which illustrates the position of the linkages when the plunger and blank holder are in lowered position, there is shown by dotted lines a position of the links 65 and 66 and of the link pin 70 whlch may result from a change in running clearances as a consequence of the link pins 67 and 68 approaching one another. It will be observed that. the link pin 70 has slid in the bushing 76, but the sliding of pin 70 imposes no additional stress u on the linkage 81, 7 8 by which the rock sha t 41 is actuated from the slide 50, and hence the running clearance of the linkage 81; 7 8 is not modified or altered in any way by a different or a changing clearance of the linkage 65, 66. While the bushing 76 is herein shown as rigidwith rockarm 78 and constructed to guide the'pin 70 for sliding movement at right angles to the axis of the rock arm, it should be understood that the construction and arrangement of these parts is subject to modification, and that I may secure the bushing 76 to either member of the linkage cooperating therewith or change thedirection of slide of the pin 70 therein without departing from the spirit of the present inventionI The forward end of the slide member is connected in actuating relationship with the front rock shaft 40 to drive the latter by mechanism which consists of a link pin 85 carried by the slide member, a link 86 pivoted thereon, and pivotally connected at its other end with link pin 87 carried upon the outer end of the forked rock arm 88 ex -tending from the front rock shaft 40.

The linkage between. the sliding member 50 and each of the rock shafts 40 and 41 is such that the rock shafts are actuated through equal angular distances thereby effecting parallel raising and lowering movement of the blank holder throughout its operation, and securing even pressure of the blank holder upon the work. An important feature of the present invention is the arrangement of linkages by which the power of the plunger-actuating shaft 29 is transmitted direct "to the sliding member 50, the rock shafts 40 and 41 being actuated from the sliding member by linkages, the running clearances of which are not modified or in} fiuenced unequally by the running clearance of the main driving linkage.

In Figs. 13, 14 and 15 there is illustrated a modified form of linkage fordriving the sihgle slide actuatin -member from the plunger-actuating shaft of the press. The

arrangement of the press frame, the rocker shafts, the plunger-actuating shaft, the slide actuating-member,and the linkages, is generally the same as in Figs. 1 to 12 and these parts have been indicated by reference characters corresponding, to the corresponding parts in Figs. 1 to 12. The arch member of the press frame is shown at 123, the plungeractuating shaft at 129, the front and rear toggle rock shafts at and 141 respectively and the single slide actuating-member at 150. The rocker shaft 140 is operatively connected with the blank holder, not shown, by rock levers 142 and links 143, and the rocker shaft 141 is similarlyconnected with the blank holder.

The single slide actuating-member is slidably mounted in a slide housing 151 which extends through an obliquely disposed opening 153 in the arch member 123 and which is provided with a flange 152 by which it may be rigidly secured to the arch member. The plunger-actuating shaft 129 is provided with a crank 155 which is connected by a connecting rod 156 with rocking sector shaped lever 157 pivotally mounted on pin 158, which lever 157 is in turn connected through link 160 to rocking lever 161. Rocking lever 161 is mounted for rocking movement about pin 162. The roc ing lever 161 is pivotally connected with the slide member 150 by links 165 and 166.

The rocking lever 161 and the link 166 is hollow pins or bushings 176 which are carried by the forked rock arms '17 8, said rock arms having a pair of forks adapted to cooperate with and receive each of said bushings 17 6 Each end of the link pin 170 is provided with a pair of parallel flat surfaces 17 5 adapted to be received between cooperating parallel fiat surfaces 177 upon the interior of the bushings 176. As before, the bushings 176 are constructed'to have a close sliding fit with the surfaces of the link pin 170 and may slide a short distance relativelyto the pin 170 in, either direction parallel with the surface 17 5 and at right angles to the axis of the pin 170. Since the pin 17 0 is keyed to the link 166 with the flat surfaces parallel with the longitudinal axis of link 166, it is apparent that the bushings 176 are constrained to movement upon pin 175 in a direction parallel with the longitudinal axis of the link 166. As best illustrated in Fig. 14, the links 181 are pivotally mounted upon the bushings 176 between the pairs of forks 178. The rear end of the slide actuating-member 150 is thus connected with the rocker shaft 141 through links 181, bushings 176, and the forked' -arms 178 mounted on rocker shaft 141, and because of the sliding connection between the bushings 176 and the pin 170 there is a certain independence of movement between the main linkage by which the slide actuating-member 150 is driven and the linkage by which the slide actuatingmember is connected with the rocker shaft 141, as will be readily understood. r

lhe forward end of the slide member 150 is connected in actuating relationship with link pin 187 carried upon the upper end of Y the rock arm 188 extending from the front rock shaft 140.

It will be understood that the form of mechanism shown in Figs. 13 to 15 operates in the same general manner as the form illustrated in Figs. 1 to 12. a

While the forms of apparatus herein described constitute preferred embodiments of i the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may ing be made therein without departing from the scope of the invention which is defined in the appended claims.

' What is claimed is: I

L A drawing press comprising a frame, a plunger, and a blank holder, and means provided at the transverse center of the press for reciprocating said blank holder with a dwell in its movement, said means comprising an actuating member guided to slide back and forth in a direction inclined to the direction of movement of said blank holder, and a driving connection between said actuating member and said blank holder.

2. A drawing press comprising a frame, a plunger, and a blank holder, and means for reciprocating said blank holder with a dwell in its movement, said means comprisan actuating member above the blank holder guided to slide in a direction inclined fromfront' to rear of the press, and a driving connection between said actuating meinher and said blank holder.

3. A drawing.press comprising a frame, a plunger, and a blank holder, a pair of spaced apart rock shafts for actuating said blank'holder, and means for actuating said rock shafts, said means comprising a slide member guided to slide in a directioninclined obliquely to the rock shafts and equally spaced therefrom, and a driving connection between said slide member and said rock "shafts.

4/11 drawing pres s comprising a frame, a

plunger, and a blank holder, apair of spaced apart rock shafts for actuating said blank 6O holder, and means for actuating said rock shafts, said means comprising a slide actuating-member disposed between .said rock shafts and guided to slide along a line passing over one of said rock shafts and under theother rock shaft, and adriving connection between said slide member and said rock. shafts.

. 5. A drawing press having a frame, a plunger, and a blank holder, a rotary shaft actuating said plunger, and means for actuating said blank holder with a dwell in its movement, said means comprising a single slide actuating-member mounted medially of tions, said driving connections beingconnected with the slide at points spacedapart in the direction ofmotion of the slide.

6. A. drawing press having a frame, a plunger, and a blank holder, a crank-shaft for operating said plunger, and mechanism for-reciprocating said blank holder with a dwell in its movement, said mechanism comprising a slide member guided to slide from front to rear of the press, a rock member, connection from said'rock member to said slide member, and connection from said rock member to said crank-shaft,'said several connections each providing for a dwell of the slide member, and means connected with opposite ends of said slide for transmitting motion therefrom to the blank holder.

71A drawing press having a frame, a plunger, and a blank holder, and mechanism for reciprocating said blank holder with a dwell in its movement, said mechanism comprising a slide member, means for actuating said slide member, and means connected with the slide for transmitting motion therefrom to the the blank holder, said dwell in its movement, said mechanism comprising a slide member, means for actuating said slide member, and, means connected with the slide for transmitting motion therefrom to the blank holder, one of said means having an element distinct from the slide mem ber itself which is guided in its movements by said other means.

9. A drawing press having a frame, a

plunger, and a blank holder, and mechanism for reciprocating said-blank holder with a dwell in its movement, said mechanism comprising a slide member, means for actuating said slide member, a rock shaft connected with the slide member, a linkage for actuatin said rock shaft from'the slide member sald linkage including a rock lever carried by said rock shaft, and means for actuating said slide member, said last-mentioned means having a movable element which is guided in its movement by said linkage.

10. A drawing press having a frame, a plunger, and a blank holder, and mechanism for actuating said blank holder with a dwell in its movement, said mechanism comprising a slide member guided to slide in a direct-ion from front to rear of the press, means connected with said slide member for transmitting motion therefrom to the blank holder, and means connected at the rear end of said slide for actuating the same.

11. A drawing press comprising a frame, a plunger, a crank-shaft operably connected to said plunger, a blank holder, a pair of rock shafts for actuating said blank holder, and mechanism for actuating said rock shafts to move said blank holder comprising a slide member provided at a medial point of the frame, connections from said slide member to each of said rock shafts, said connections having a similar number of operating parts to provide for equal operation of the rock shafts, a rock part, operating connections from said rock part to said slide member and to a medial portion of said crank-shaft, said last named operating connections each including an arm distinct from the slide member the crankshaft and the rock part connected to provide for a substantial dwell in the movement of the silde member and of the rock shafts.

12. A drawing press comprising a frame, a plunger, a crank-shaft operably connected to said plunger, a blank holder, a pair of rock shafts for actuating said blank holder lying parallel to the crank-shaft, and mechanism for actuating said rock shafts in opposite directions to move said blank holder comprising a slide member provided at a point centrally of the ends of the frame, connections from said slide member to intermediate parts of each of said rock shafts, a rock part operating connections distinct from the rock part the slide member and the crank-shaft, from said rock part to said slide member and to the central 'portion of said crank-shaft, said last named operating connections each providing for a substantial dwell in the movement of the slide member.

13. A drawing press comprising a frame. a plunger, a crank-shaft for operating said plunger, a blank holder, a pair of rock shafts, toggle connections from said rock shafts to said blank holder, and mechanism for actuating said rock shafts in opposite directions to move said blank holder comprising a slide member guided to reciprocate in a direction inclined to the direction of movement of said blank holder, connections from said slide member to each of said rock shafts, an actuating part, connections from said actuating part to said slide member and to a medial portion of said crank-shaft, said last named connections each including arms connected to provide for a substantial dwell in'the movement of the slide member and rock shafts.

14:. A drawing press, comprising a frame, a plunger, a crank-shaft for operating said plunger, a blank holder, a pair of rock shafts parallel to said crank-shaft, toggle connections from said rock shafts to said blank holder, and mechanism for actuating said rock shafts simultaneously and equally in opposite directions, comprising a slide member guided for reciprocatory movement at an angle to the direct-ion of movement of the blank holder at a point centrally between the ends of the frame, connections from said slide member to intermediate parts of each of said rock shafts, said connections having a similar number of operating parts, a plurality of rock parts mounted intermediate the ends of the frame on axes fixed in said frame, and intercom nections between a rock part and the slide member, between the other rock part and a medial portion of the crank-shaft, and be tween said rock parts, each providing for a dwell in the movement of the slide member.

l5. A drawing press comprising a frame. a plunger, a crank-shaft for operating said plunger, a blank holder, a pair of rock shafts for actuating said blank holder, and mechanism for actuating said rock shafts in opposite directions, comprising a movable member located intermediate the ends of the frame, connections from said movable member to intermediate parts of each of said rock shafts, a rock part mounted on an axis fixed at the rear of the press at a central portion thereof and rearwardly offset from the crank-shaft axis, connections from said rock part to said movable member and to an intermediate portion of said crank-shaft, said last named connections each including members connected to provide for substantial dwell in the movement of the movable member and of the rock shafts.

In testimony whereof I hereto affix my signature.

ARTHUR A. BYERLEIN.

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