US2979743A - Shoe-end lasting machine with common drive for the feeding and closing motion of pivoted wipers - Google Patents

Description

Aprll 18, 1961 GUNSCHEL 2,979,743

SHOE-END LASTING MACHINE WITH COMMON DRIVE FOR THE FEEDING AND CLOSING MOTION OF PIVOTED WIPERS Filed Jan. 2, 1958 4 Sheets-Sheet 1 April 18, 1961 K. GUNSCHEL 2,979,743 SHOE-END LASTING MACHINE WITH COMMON DRIVE FOR THE FEEDING AND CLOSING MOTION OF PIVOTED WIPERS Filed Jan. 2, 1958 4 SheetS -Sheet 2 MN k Mm mm Q 1 aw a QN %N m m QM Q April 18, 1961 K. GUNSCHEL 2,979,743

SHOE-END LASTING MACHINE WITH COMMON DRIVE FOR THE FEEDING AND CLOSING MOTION OF PIVOTED WIPERS Filed Jan. 2, 1958 4 Sheets-Sheet 3 April 18, 1961 K. GUNSCHEL 2,979,743

SHOE-END LASTING MACHINE WITH COMMON DRIVE FOR THE FEEDING AND CLOSING MOTION OF PIVOTED WIPERS Filed Jan. 2. 1958 4 Sheets-Sheet 4 INVENTOR MP4 UN$CHEL TORNEYS SHOE-END LASTING MACHINE WITH COMMON DRIVE FOR THE FEEDING AND CLOSING MO- TION OF PIVOTED WIPERS Germany assignor to and Nagelwerke, Weissenfels, Saal'e,

This invention relates to machine tools and more partic'ularlyto a shoe-end lasting machine.

.In certain conventional lasting machines of this type; the wiper slide is articulated with a hand lever that is supported upon the machine frame, and the setting slide directly effects the forward motion of the wipers. Usually a bearing pedestal for a link is disposed upon the setting slide that is connected with a toothed segment supported On the machine for its closing movement. The toothed segment engages a number of teeth of a second slide which is articulated with the wipers at a point removed from the fulcrum thereof. In response to the actuation of the hand'lever, the wipers are advanced by the wiper slide, and by the adjustable coupling of the setting slide withthe wiper slide, closing motion of the wipers is produced, The parts are so arranged that in response to the start of the forward movement of the wipers, they are simultaneously urged toward a closed position.

It has been found in practice, however, that the closing motion of the wipers begins only after they have already been forwardly actuated. Furthermore, the forward movement of the wipers should be delayed as they appreach the end of their forward stroke. The actual. closing movement of the wipers should take place only after they are already in the final forward position or. directly in front of this final forward position. This is impossible with present lasting machines and, to be sure, it isonly possible in the case of presently available machines to delay the forward motion of the wipers toward the head of the stroke, but it is not possible 'to adapt the closing motion thereof in the desired manner tothe forward motion. The reason is that the setting slide and the wiper slide pass withpractically the same speed intothe jend"position.' Furthermore, the delay of the forward f movementof the wipers'is dependent upon a' corresponding reduction of the angular velocity of the lever, and "thus, upon the skill of the operator.

"In order to avoid these disadvantages, there are presently available lasti'ng machines in which the common drive means for the two movements of the wipers consists of a drum havingone or two'eam grooves. In these" machines, ,th'e-cams can be so shaped to impart the. tie-- sired "movements. However, such a drum is costly to manufacture and is easily worn out. Furthermore, at least the closing movement of the wipers requires a very complicated rack mechanism whereby these lasting machines become extremely complicated and are thus subje'ct to breakdow'n'and expensive maintenance problems.

=The present invention is generally similar to that disclosed and described in US. Patent No. 1,712,979, granted May 14, 1929, on an application by A. F. Carlson, but includes certain improved mechanisms for controlling both the forward advance of the wiper slide and the closing movement of the wiper members.

;The present invention includes a reciprocable frame actuated by. an hydraulically or pneumatically controlled I piston. ,trame includes two rods upon each of" connected'to one of the .PatentedApr. '1-8, 1961- wipers to effect their arcuate movement. The rods .are also provided with a link pivotally connected to each rod. The links are connected to the'wipers to reciprocate them in accordance with the movement of the rods. movement of the wipers is adjusted by varying the relative position of the double-armed levers in relation to their associated rods. The adjustment is made by a hand wheel setting adjustment mechanism connected to each lever.

Accordingly, an object of the present invention is to i provide a lasting machine that will overcome the aforementioned difiicultiesin a very simple and efiicient manner. 7

:Another object of the present invention is to provide I. a lasting machine that has a pair of doubled armed levers for effecting the closing movement of the wipers and a pair of links for actuating the slide which bears the wipers and efiects their feed motion, suchlinks being supported transversely to the longitudinal axis of the setting slide, and each double armed lever having its outwardly directed arm pivotally connected to the setting slide control. A further object of the present invention is to provide a lasting machine of the above type in which the for ward movement of the wipers is delayed toward the endof'its stroke so that the actual closing process thereof takes place when the wipers have reached their final position.

Other objects of the invention are to provide a lasting machinebearing the above objects in mind which is of simple. construction, has a minimum number of parts, is inexpensive to manufacture and eflicient in operation. 'For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in conjunction with the ac-t companying drawing, in which:

' Figure l is a longitudinal cross sectional view taken along line 1-1 of Figure 2;

Figure 2 is a transverse cross sectional view taken along line 2-2 of Figure 1;

Figure 3 is a perspective view of certain parts of the apparatus shown in Figures 1 and 2; and

. Fig. 4 is a schematic illustration of the lever mecha nism of the shoe end'lasting machine constructed in ac-.1 cordance with the invention.

In accordance with the present invention, a shoeend lasting machine has been provided that has acommondrive for the feeding and closing movements of the wipers with the aid of two' slides, the motion of each being' dependent-upon theother, and the drive means being connected to the setting "slide. I 1 I Referring now more in detail to the drawing, a ma chine made in accordance with the present invention is shown to include a-frame 1 with the wiper slide 2 guided forlongitudinal sliding movement-on frame 1 between guide walls 50'and 52. A pair of wipers 4, 5 and their carriers 6, 7 are received within the'arcuate gro'ove'3 of the slide 2.- The wipers, together with their carriers, can beswung in a known manner about the point 8 of the tongue of the wiper slide 2. 'A setting slide is guided} for parallel movement with the wiper slide 2 in the 1 machine frame 1.

eyes or lugs 12, 13, 14, 15 for guiding these bars 10, 11.

The cross member 9 is connected with the piston rod 16 of'a hydraulic .or pneumaticpressuredevice 11 for driving the'setting'slidel Adjacent one end of each of the, rods-10,11, there isipivotally mounted a separate- link 18, 19 and spaced slightly The closing arcuatearmed lever 20, 21. These members is, 19, 2o, 21 are thus swingable parallel to the wide side of the setting slide 9, 10, 11. The inwardly directed end of each of a the links 18, 19 is each pivotally connected with a corresponding angle lever or crank arm 22, 23'. These angle levers are supported uponthe machine frame.

pivotally mounted on bolts 221 and 231 respectively of the machine frame 1. It will thus be recognized that in the event that the setting slide 9, 10, 11 is in the out of operation position, the links 18, 19 turn their end connected with one of the angle levers 22, 23 toward the slide 2. When in the operating position, the setting slide 9, 10, 11 is so disposed that the links 18, 19 are approximately at right angles to the longitudinal axis of the setting slide. In case of a continuously constant speedof movement ofthe setting slide 9, 10, 11 the forward speed of the wiper slide 2 will thus be continuously reduced. The outwardly directed arms of the double armed levers, 20,21 are connected by means of links 28, 29 to bearing bolts 30, 31 that are provided upon the machine frame. The inwardly directed arms of the double armed levers, 20, 21 are connected through links 32, 33 with the wipers 4, and their associated carriers 6, 7 These double armed levers 20, 21 are at approxi! mately right angles to the longitudinal axis of the setting slide 9, 10, 11 when the latter is approximately in the center of its forward movement.

The bearing pins 30, 31 are located on slide bearings 34, 35 which are guided for movement parallel to the longitudinal axis of the setting slide 9, 10, 11 in the machine frame 1. These slide bearings are in connection with a drive shaft 36 through gears 37. 38 or the like. By turning the hand wheel 39, the slide bearings 34, 35 can thus be displaced axially together. It is thus possible for the machine to be set'to any particular shoe size.

Rod or bar is pushed to the-left in Fig. 2 by cross member 9 through piston rod 16. Referring to Fig. 4, the same displacement occurs to pivot point 101 of double lever and 102 of link 18. In the starting position link 18 forms an angle a. with bar 10. The bar 10 is linked to angle lever 22 at 222,- The angle lever 22 has a centralstationary pivot point at 221. In the end position, when the angle or becomes 90", i.e., when link 18 is at a right angle with bar 10, the turning movement of angle'lever 22 is zero. This displacement of slide 2 the pivot point 61 (see 8 in Fig. 3) 'of' carrier memher. 6 also rapidly, decreases, to, zero. with respect to the. uniformly moved bar10. The double lever 20 is pivoted tci link 28 at 201 and to link-32 at 202. The link 32 is in turn pivoted at 62 to carrier 6; Link 32 with pivot points. 202 and 62 is moved through'point 101 of bar 10 with approximately double, the speed of the bar. The dimensions of the members are so chosen, that at theheginning of the movement bar 10 and points 6 1(8) and 62 of carrier 6 have a uniform speed, the

speed ofpoint- 61 dropping rapidly during the movement. to zero, so that at the end of the movement a rapid turning of carrier 6 about point 61(8) will take place. The pressure device 17 subsequently moves 'all drive meme hers back to their starting position.

Viewed as a drive, the members 20, 32, 6 represent a linkage in which 20 is the driving'crank, 32 the coupling link, and 6 the driven crank, the, latter being first dis-' placed parallel and then assuming a turning movement about point 62' of slide carrier 6 due, tov its decrease in velocity down to zero; Slide 2 is the driven memberof the, push crank drive 22, 26, 2, which receives its drive from bar. 10 of: the, crank drive. 10, 18, 22. With. the

velocity ofrbar, 10 remaining unchanged, the. velocity. of-

crank 22; and thereby, the. velocity, of slide. bar 2 drops z ra utisanhamoremene In order to be assured that the actual closing move? ment of the wipers is delayed toward the end, it is only necessary to be assured that the double armed levers are approximately at right angles to the axis of the setting slide when the setting slide is in its central position, while the links for the wiper slide, on the other hand, assume approximately this position when the setting slide is in its front end position.

The slide bearings 34 and 35 have internal threads, and the stationary shaft portions 40 and 41 have counter threads for engagement therewith. The stationary shaft portions 40 and 41 are secured against displacement, and each carries a worm gear 42 and 43, respectively, which are in engagement with gears 37 and 38,-respectively. By

turning the shaft 36 by means of hand wheel 39, shaft portions 4:) and 41 are rotated and this causes an axial displacement of slide bearings 34 and 35.

It will thus be recognized that a shoe end lasting machine has been provided that can be quickly and readily adapted for use with lasts of substantially any size.

While various changes may be made in the detail con-. struction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

l. A shoe lasting machine comprising a frame, a wiper slide reciprocably mounted on said frame, apair of complementary wipers slidably mounted on said wiper slide and confined thereon for arcuate sliding movement, a pair of members reciprocably mounted on said frame, driving means connecting each of said members for reciprocating them simultaneously, a double armed lever pivoially connected to each of said members, means connecting one arm of each of said levers to a respective one. of said wipers to move the latter along an arcuate path, setting means connected to the other arm of each of said levers to adjust the relative position thereof in respect to the associated member, and means connecting said wiper slide with each of said members to reciprocate saidv slide with said members.

2. A shoe lasting machine comprising a frame, a wiper slide reciprocably mounted on said frame, said slide. including an arcuate groove, a pair of complementary wipers slidably mounted on said wiper; slide, and confined in said groove for. converging and diverging movement in respect to each other, a pair of rods reciprocably mounted on said frame, driving means connecting'each of said rods for reciprocating them'simultaneously, a dol blearmed lever centrally pivotally connected, to each of said rods, me s n n on m of each. i d ayer n. a respective one of said Wipers tomdve saidwipers; arcuate groove, setting means connected, to thefother of eachof said levers to, adjust the relative osition there of in respect to its associated rod, a piyotal ly connected to each of said rods, and means connecting' the: free end of said links andsaid wiper slide to reciprocate said wiper slide with said rods, 7 1

3 A shoe lasting machineaccording q claim 2, where,- in said double armed levers are directed approximately atright angles, to said rods when the latter are intheir central position of movement, and saidlinks. assume this. pos he i d r hef ly van edrositicn.

4. A shoe lasting machine according, to claim 2 whe rein said setting means includes a sliding memberconnected; to each of said double armed levers, and handoperable adjusting means connected to said sliding members; for positioning the. latter.

e a t g m ch ne omp isin rame, alwi er slide reciprocably' mounted on, aid frame said slide in-. cluding an ,arcuate groove, a pair of? complementarywipersflslidahly mounted-on said wiper slideand confined for movement-along said groove, a reciprocable-setting frame, including a rod ateach side of s-a id fram d 'iyiggmeans. connected to said frame for the latter, a double armed lever centrally pivotally connected to each of said rods, means connecting one arm of each of said levers to a respective one of said wipers to move the latter along the arcuate groove, setting means connected to the other arm of each of said levers to adjust the relative position thereof in respect to its associated rod, a link pivotally connected to each of said rods, first and second crank arms pivotally mounted on said frame, each having one arm thereof connected to the free end. of said links and the opposite arm thereof connected to said wiper slide whereby to reciprocate said slide with said rods.

6. A shoe lasting machine comprising a frame, a wiper slide reciprocally mounted on said frame, a wiper slidably mounted on said wiper slide and confined thereon 15 6 for arcuate sliding movement, a member reciprocably mounted on said frame, driving means connecting said member for reciprocating said member, a double armed lever pivotally connected to said member, means connecting one arm of said lever to said wiper to move said wiper along an arcuate path, setting means connected to the other arm of said lever to adjust the relative position thereof in respect to said member, and means conmeeting said wiper slide with said member to reciprocate 10 said slide with said member.

References Cited in the file of this patent FOREIGN PATENTS 150,723 Austria Sept. 25, 1937

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