US3025541A

US3025541A - Pulling over device for shoes, particularly for a toe lasting machine

Info

Publication number: US3025541A
Application number: US782938A
Authority: US
Inventors: Weinschenk Albert
Original assignee: EG Henkel Maschinenfabrik
Current assignee: EG Henkel Maschinenfabrik
Priority date: 1958-10-03
Filing date: 1958-12-24
Publication date: 1962-03-20
Anticipated expiration: 1979-03-20

Description

March 20, 1962 w sc NK 3,025,541

PULLING OVER DEVICE FOR SHOES, PARTICULARLY FOR A TOE LASTING MACHINE Filed Dec. 24. 1958 5 SheetsSheet 1 FIG 7 FIG 2 3E H 2 m @NQU 2H U FIG. 3

/N VE N 70.9.

March 20, 1962 A. WEINSCHENK 3,025,541

PULLING OVER DEVICE FOR SHOES, PARTICULARLY FOR A TOE. LASTING MACHINE Filed Dec. 24, 1958 5 Sheets-Sheet 2 O 0 o 5 H s: 5T7; 14 H13: 1 37 \EE 5 1'55 7 (5 as F 37 a J F/Q4 J INVENTOEI 5 4914x0 4? March 20, 1962 Filed Dec.

PULLING OVER DEVICE FOR SHOES, PARTICULARLY A. WEINSCHENK FOR A TOE LASTING MACHINE 5 Sheets-Sheet 3 N V E N 7 0R 191 0- t/i ra uZ March 20, 1962 A. WEINSCHENK PULLING OVER DEVICE FOR SHOE S, PARTICULARLY FOR A TOE LASTING MACHINE 5 Sheets-Sheet 4 Filed Dec. 24. 1958 March 20, 1962 WEINSCHENK 3,025,541

PULLING OVER VICE FOR SHOES, PARTICULARLY FOR A TOE. LASTING MACHINE Filed Dec, 24, 1958 5 Sheets-Sheet 5 United States Patent @hhce Patented Mar. 20, 1962 3,025,54l FULLING DEVECE FSR SHOES, PARTICU- EARLY FUR A TQE LASTING MACHENE Albert Weinschenlc, Seulherg (Taunus), Germany, as-

signor to Eugen G. Henlrel K.G., Frankfurt am Main,

Germany, a corporation of Germany Filed Bee. 24, 1958, Ser. No. 732,938 Claims priority, application Germany Oct. 3, 1953 23 (Jlairns. (til. 12-1ll.1)

In the known pulling over machines used in the shoe industry, the upper leather is generally grasped by two grippers and one toe gripper and pulled over. Thereby a relatively wide space is left free between the toe grippers and the lateral grippers, which is, of course, detrimental to a uniform pulling over of the upper. That is why the form of the grippers was relatively wide and accord ing to the shape of the last, and why the grippers were drawn back to the vicinity to the lateral pincers in order to form a nearly closed gripper circle. But a uniform pull is not obtained, cited arrangement of the toe pincers, thickness varies as some models demand, or if there are seams on the front caps like, as in these cases the usual gripper construction cannot compensate the unequalities and cannot hold the leather uniformly along its entire rim. The consequence is a non-uniform pulling over force resulting generally in many folds.

Further disadvantages of the pulling over machines as used up to now consist in the fact that a correcting of the toe part after the pulling over, is not or is only partly possible, and that, furthermore, when using eX- tremely different last shapes, the toe grippers must be interchanged, which is of course complicated and SlOWs down the production if these changes have to be made often.

It is an object of the invention to eliminate the disadvantages of known pulling over devices and the invention accomplishes this object by using two pulling over grippers arranged adjacent to each other instead of the one toe gripper usual up to now for the toe point. The two grippers can be adjusted and regulated independently of each other according to the dimension and the form of the shoe last. For the last cited purpose the two toe pincers can be pivoted, each one separately, by means of one pivoting segment in a horizontal plane around an inner gripper point lying opposite the fore- .lOSt point of the shoe. Thus it becomes possible, as stated above, to adapt both toe grippers to every last form, so that in each case the last i surrounded by a practically closed line of grippers. For the same purpose, i.e. for the adaption to the last form and above all to the size of the last, both toe grippers are furthermore arranged irl such a way, that they can be moved towards the point of the shoe or away from it and be adjusted and fixed in such a position.

A further inventive feature consists in the fact that the basic position of each toe gripper, i.e. their position relative to the lower rim of the lasting wiper can be regulated, for which purpose the height of each one of the grippers can be adjusted. Furthermore, the lower parts of the grippers are arranged in such a way, that they can be pivoted around a bolt relative to the upper part of the grippers, whereby unequal thicknesses of leather can also be grasped uniformly. In order to be able to grasp a uniformly wide edge of the upper leather the upper parts of each toe gripper are provided with stop pins.

A further inventive idea consists in providing a correcting device for the alignment of the pulled over upper leather front part, which device can be handled easily and surely in spite of the pulling forces. This correcting device comprises two independent levers under spring load, on which stop pins are provided, which act on the gripper holder in such a manner that each gripper can be adjusted in its height in closed state and thus the forward point of the upper leather can be aligned at will.

The invention is to be elucidated further with reference to the drawings which illustrate an embodiment of the device according to the invention.

FIGS. 1 and 2 are diagrammatical plan-views of the arrangement of grippers as were usual up to now,

FIG. 3 is a diagrammatic view of the arrangement of the pincers according to the invention.

FIG. 4 shows the complete pulling over device in planview, partially in section.

FIG. 5 shows the complete toe lasting and glueing machine with a pulling over device according to the invention in side elevation, and

FIG. 6 is an elevation illustrating the gripper supporting and operating part of the machine on an enlarged scale.

FIG. 7 is a fragmentary schematic plan view illustrating the position of the toe grippers opposite the last.

FIG. 8 is a fragmentary side elevation, partly in section, illustrating the gripper supporting and operating part of the machine on an enlarged scale.

FIG. 9 is a longitudinal sectional view of a control piston arrangement for interrelating the operations of wiper means with the gripper operation; and

FIG. 10 is a cross sectional view of a control valve used in the device of FIG. 9.

In the FIGURES 1 to 3 the last, which is surrounded in the usual manner by the lateral pulling over grippers 2, is given the number 1. In FlGURE l one of the toe grippers 3 usual up to now is shown and in FIGURE 2a toe grippers 4, which is somewhat broader than the grippers 3 and is adapted to the shape of the last is shown. The deficiencies of these toe grippers 3 and 4 were already described hereinbefore. According to the inventionFlGURE 3two

separate toe grippers

5 and 6, arranged adjacent to each other, are provided, so that an almost completely closed grip line of grippers is formed.

As shown in FIGS. 6 and 8, each of the two toe grippers consists of a fixed upper jaw 7 and a movable lower jaw 8, which is adjustably fixed on a piston 9, operated hydraulically through the feed conduit it). The grippers are arranged on cylinder portions 11, which are fixed on seg meat-shaped supports 12, see \FIG. 5. This pivotable segment 12 is arranged on supporting means including a holder 14, which holder is fixed on a shaft 35. This shaft 15 can slide longitudinally in bearings 17 of the machine frame 125, while guide bolts 15 prevent rotation of the shaft. Around the upper end portion of the shaft a spring H is arranged, which bears on the one side against the bearing 17 and on the other side against a flange 2%). On the lower shaft end a flange Zll is rigidly arranged, in which an adjusting screw 22 is arranged. which abuts against the lower bearing 17. By means of this screw 22 the basic position of the grippers, each of which is fixed to a shaft 15 by means of the parts ll, 12 and 14, can be independently adjusted to the lasting wiper 23.

The pivoting segment 12, supporting cylinder portion 11 is arranged in a guide groove 24 (FIG. 4) of the holder 14 and can be shifted within the guide groove 24, so that the grippers can be pivoted around the adjacent points 25 in the direction of the arrows. Thus the

grippers

5 and 6 can be independently adapted in each single case to the shape of the last 1 used. In order to fix the segment 12 in the necessary position the cross lever 27 is used. In FIGURE 4 the segments 12 and thus also the

grippers

5, 6 are represented in different positions.

In order to adjust the

toe grippers

5 and 6 not only according to the shape of the last but also corresponding to the size of the last, the portion 11 of the grippers is arranged in such a way on a bolt 23 xed in the pivotable segment 12, that the portion 11, together with the grippers, can be pivoted towards the tip of the last or away from the same, so that the distance of the toe pincers from the tip of the last can be regulated. This pivotal movement is executed. and adjusted by means of the

screws

29 and 3%.

FIG. 6 and FIG. 8 show that the lower jaw 8 of the grippers is fixed to the piston 9 by means of a turnable pivot pin 31, so that it is easily pivotable relative to the upper jaw of the grippers '7. This has the advantage that, in grasping the edge of the upper leather, uneven thicknesses of the leather can be compensated for so that in case of not uniform leather thicknesses, the rim of the upper leather is grasped uniformly between the two gripper jaws.

On the upper part 7 of the grippers stop pins 32. are provided, which engage with play into corresponding recesses 33 of the lower jaw 8 of the grippers. The play of stop pins 32 in the recesses 33 is suificient to permit the pivotal movement of jaw 8 relative to jaw 7. By these stop pins 32 an uniformly broad rim of the leather is grasped, so that the pulled over portion of the upper, and respectively the final permanent rim is uniform for each shoe.

FIG. 4 (and also FIGURE 5) shows a correcting device by which a correction of the fit of the upper before cutting procedure is made. This correcting device consists of the stops 34 which are firmly arranged on a shaft 35, journaled in the machine frame 18. At the other end f this shaft 35 a lever 36 is fixed, which is provided with a stop pin 37 engaging into catch 38. if the

grippers

5 and 6 have pulled over the point of the uppers and a correction becomes necessary, the levers 36 are disengaged (as shown in the right part of FIGURE 4) and are pressed downward or upward, so that the stops 34 in connection with the flange 21 either press the shaft downward or permit upward movement of shaft 15 through the spring. The same movement is thereafter made by the respective grippers. In the necessary height the lever 36 are again engaged into the catch holes 38, whereafter the wiper means 23 are operated. After this procedure all the different parts of the machine are returned to their initial position and this applies also to the correcting lever 36. This is done in such a way, that through the conduit 4% pressure oil flows into the cylinder in which pistons 41 are located, so that the pistons 41 are pressed outward, whereby also the shafts move outwardly, taking the levers 36 with them, so that these latter are disengaged from the catch holes 38 and are drawn by the tension springs 42 into their uppermost normal position.

During the wiper operation, the grippers must of course be loosened, as is generally known, and in order to execute this procedure at the right time in order to avoid the formation of folds in the lasted position of the upper, the opening of the grippers depends on the path of the wipers 23. For this purpose a blocking valve 4-3 is provided, which is controlled by the piston 33 over a lever 44, a shaft and an adjustment jaw 46. Cum lever 44 acts on a projecting pin 43 of valve 43 so that the flow of liquid to cylinders 11 is controlled by valve 43 to effect loosening of the grippers when piston 13 is in a position in which the wiper is operative. Movement of shaft 45 with piston 13 will turn lever 44- to operate valve 4-3.

The above described embodiment proves that the toe grippers according to the invention by their many different adjusting and regulating possibilities, fulfill every requisite necessary for a perfect pulling over of the upper and for obtaining a uniform, foldless pulled rim of the upper, which is the presupposition for a perfect lasting.

What I claim as my invention is:

1. Apparatus for pulling an upper over a last, com

prising, in combination, a pair of grippers having adjacent end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last; a pair of supports supporting said grippers for turning movement about axes passing through said adjacent end points, respectively; a pair of supporting means respectively supporting said pair of supports, and each supporting means including means for adjusting in the direction of said axes the positions of said grippers relative to the last; and means for turning said grippers on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continuous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continuous grip line over the last.

2. Apparatus for pulling an upper over a last, comprising, in combination, a pair of grippers, each gripper including a main portion, a rigid jaw secured to said main portion, and a pivoted jaw pivotably mounted on said main portion for movement relative to said rigid jaw to adapt to portions of the upper having diiferent thickness, said jaws of said grippers of said pair of grippers having adjacent end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last; a pair of supports supporting said main portions of said grippers for turning movement about axes passing through said adjacent end points, respectively; and means for turning said grippers on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continuous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continuous grip line over the last.

3. Apparatus for pulling an upper over a last, comprising, in combination, a pair of grippers having adjacent end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last; a pair of supports supporting said grippers for turning movement about axes passing through said adjacent end points, respectively; supporting means supporting said supports for movement in the direction of said axes independently of each other, and including a pair of levers respectively operatively connected to said supports and means for securing said levers independently of each other whereby the position of said grippers can be adjusted and corrected relative to each other and to the last; and means for turning said grippers on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continuous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continu ous grip line over the last.

4. Apparatus for pulling an upper over a last, comprising, in combination a pair of grippers, each gripper including a main portion, a rigid jaw secured to said main portion, and a pivoted jaw pivotably mounted on said main portion for movement relative to said rigid jaw to adapt to portions of the upper having different thickness, said jaws of said grippers of said pair of grippers having adjacent end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last, each of said rigid jaws including pins, and each of said pivoted jaws including recesses for receiving said pins; a pair of supports supporting said main portions of said grippers for turning movement about axes passing through said adjacent end points, respectively; and means for turning said grippers on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continuous grip line over the last.

5. Apparatus for pulling an upper over a last, comprising, in combination, a pair of gripper means, each gripper means including two gripper jaws having directly adjacent inner end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last, each gripper means including a part-circular guide part having an axis passing through said inner end point, a bearing on each guide part, and a pivot shaft in each bearing supporting the respective gripper jaws for turning novement toward and away from the last; a pair of supports supporting said gripper means for turning movement about axes passing through said adjacent inner end points, respectively, each of said supports including a part circular guide way having its center coinciding with the respective axis and receiving the respective guide portion of the respective gripper means for guiding the same for movement about the respective axis; and means for turning said gripper means on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continuous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continuous grip line over the last.

6. An apparatus as set forth in claim 5, wherein each of said supports includes a guide shaft extending substantially parallel to said axes; and a stationary frame having guide ways supporting said guide shafts for axial movement, but non-turnable; and means for arresting said supports in adjusted positions of said shafts.

7. An apparatus as set forth in claim 6, and including spring means between said shafts and said frame; and threaded adjusting means for adjusting the positions of said guide shafts against the actions of said spring means.

8. An apparatus as set forth in claim 7, wherein said guide shafts include flanges at the ends thereof, one of said flanges of each guide shaft being engaged by said spring means; a turnable member engaging the other flange of each guide shaft, a pair of levers respectively connected to said turnable members and being turnable for independently adjusting the positions of said shafts and of said grippers; and means on said frame for securing the ends of said levers in a plurality of independently adjusted positions.

9. An apparatus as set forth in claim 8, wherein each of said levers is mounted on the respective turnable means for turning movement about a turning axis transverse to the axis of said turnable means; and wherein said frame means includes two arcuate rows of catch means for arresting said levers, respectively, said levers being moved into engagement with said catch means by turning movement about said turning axes thereof.

10. An apparatus as set forth in claim 9, and including hydraulic operating means for moving said supports, said turnable means, said levers and said grippers apart from each other; and spring means for moving the same toward each other, said levers being disengaged from said catch means when moving apart; and spring means for urging said levers and said turnable means to turn to a normal position with said gripper means when released from said catch means.

11. Apparatus for pulling an upper over a last, com prising, in combination, a pair of adjacent grippers having directly adjacent closely spaced end points located in a plane in the region of the forward tip of the last and confronting the same and other end points adapted to be located laterally of the fore part of the last; a pair of supports supporting said grippers for turning movement about axes transverse to said plane passing through said adjacent end points, respectively; hydraulic means for moving said supports and said grippers apart from each other so that said adjacent end points are farther spaced from the longitudinal plane of symmetry of the last; and means for turning said grippers on said supports independently of each other about the respective axes to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form with the same a substantially continuous grip line surrounding the fore part of the last, while said inner end points remain in the same position whereby said grippers are adapted to pull an upper along said continuous grip line over the last.

12. Apparatus for pulling an upper over a last, comprising, in combination, a pair of grippers having adjacent end points located in the region of the forward tip of the last and other end points adapted to be located laterally of the fore part of the last; operating means for opening and closing said grippers; a pair of supports supporting said grippers for turning movement about axes passing through said adjacent end points, respectively; means for turning said grippers on said supports independently of each other to operative positions in which said other end points are adapted to be located adjacent other lateral grippers to form With the same a substantially continuous grip line surrounding the fore part of the last, whereby said grippers are adapted to pull an upper along said continuous grip line over the last; wiper means movable transverse to said axes and over the last for putting the upper over the last; and means operatively connecting said wiper means with said operating means for operation of said gripper means to open said grippers during movement of said wiper means over the last.

13. An apparatus for pulling an upper over a last, comprising, in combination, a pair of adjacent toe grippers having directly adjacent closely spaced inner end points adapted to be located in a plane in the region of the forward tip of the last and confronting the same, and outer end points adapted to be located laterally of the fore part of the last; means for supporting said grippers, respectively for turning movement about a pair of axes transverse to said plane and passing through said inner end points, respectively; and means for adjusting each of said grippers on said supporting means so as to locate said grippers to form a substantially continuous grip line extending along the fore part of the last while said inner end points remain in the same position whereby said grippers are adapted to pull an upper along said continuous grip line uniformly over the last.

14. An apparatus for pulling an upper over a last, comprising, in combination, a pair of adjacent toe grippers having directly adjacent closely spaced inner end points adapted to be located in a plane in the region of the forward tip of the last and confronting the same, and outer end points adapted to be located laterally of the fore part of the last, each gripper having a part-circular guide portion having its center of curvature aligned with said inner end point thereof; a pair of supports supporting said grippers, respectively for turning movement about a pair of axes transverse to said plane and passing through said inner end points, respectively, each of said supports including a part-circular guide element having its center coinciding with the respective axis, said guide elements slidably engaging said guide portions of said grippers, respectively, for guiding said grippers for turning movement about the respective axes; and means for adjusting each of said grippers on the respective support so as to locate said grippers to form a substantially continuous grip line extending along the fore part of the last while said inner end points remain in the same position whereby said grippers are adapted to pull an upper along said continuous grip line uniformly over the last.

15. An apparatus as set forth in claim l4 wherein each of said grippers is mounted on the respective support for adjustment in a direction transverse to said plane.

16. An apparatus as set forth in claim 14 and including a pair of guide shafts extending transverse to said plane and parallel to said axes and being secured to said supports; and a pair of bearing means supporting said guide shaft for longitudinal movement parallel to said axes; and means for moving said guide shaft with said supports, respectively, in said bearing means in one direction; and resilient means biasing said guide shafts to move opposite to said one direction.

17. An apparatus as set forth in claim 14 wherein each of said supports includes a cylinder, and a piston mounted in said cylinder; wherein each of said grippers includes an upper jaw fixedly mounted on said cylinder and a lower jaw pivotally mounted on said piston; wiper means movable transverse to said axes and adapted to move over the last for putting the upper over the last; control valve means for controlling the flow of an operating fluid to said cylinders; and means operatively connecting said Wiper means with said control valve means so that the latter effects opening of said grippers during movement of said wiper means over the last.

18. An apparatus as set forth in claim 14 wherein each of said supports includes a cylinder, and a piston mounted in said cylinder; and wherein each of said grippers includes an upper jaw fixedly mounted on said cylinder and a lower jaw pivotally mounted on said piston.

19. An apparatus as set forth in claim 18 and including means for mounting each of said cylinders for movement transverse to said plane and parallel to said axes.

20. An apparatus 'as set forth in claim 18 wherein each 0 of said supports includes a part including said guide portion; and wherein each of said cylinders is mounted on one of said parts, respectively, for pivotal movement about an axis parallel to said plane.

21. An apparatus as set forth in claim 14 and including a pair of turnable supporting means respectively supporting said supports for turning movement independently of each other about a common axis extending parallel to said plane; a pair of manually operated turnable levers re spectively connected to said supporting means for turning the same with said supports and grippers independently of each other; and means for arresting said levers independently of each other in adjusted turned positions.

22. An apparatus as set forth in claim 21; and including a pair of hydraulic means for holding said levers in arrested positions; and a pair of spring means for urging said levers to positions released by said arresting means.

23. An appartus as set forth in claim 22 and including wiper means movable transverse to said axes and adapted to move over the last for putting the upper over the last, said wiper means being operatively connected to said hydraulic means to effect release of said levers at the end of a wiping operation so that said spring means move said levers to said released positions.

References Cited in the tile of this patent UNITED STATES PATENTS