US2573886A - Lasting machine - Google Patents

Description

J. ZAORAL ET AL Nov. 6, 1951 LASTING MACHINE 2 sHEETsbsHEET 1'- Fled March 25, 1947 @tbm/Ma Nov-` 6, 1951 J.zAoRA1 ETAL LASTING MACHINE 2 SHEETS-SHEET 2 Filed March 25, 1947 gmc/Moms,

Josef ZaoraZ Vi lem Patented Nov. 6, 1951 Mostenic'e, Czechoslovakia, jas g hors to Bata;

nrdn podnik, Zlin, Czechoslovakia Applicationlvtamh 25,1947, seriarNo. 737,075 In Germany April 5, 1945 section 1;,ub1ic Law 690, Agt s, 1946 Patent expires pril 5, 1965 l ThisV invention relates tov an improvementin or aniodi'cation of the driving means rfor the shaping and smoothing device in shoe-end tacking machines, more particularly toe tacking machines. j l

The main function of the shaping and smoothing deviceof such machines is to pull over the upper part of the shoe, which is firmly held and tensioned by tensioning nippers, in the direction towardsvthe last edge, to embrace the part of the shoe in question along the last Vedge vand thereby to secure the tensioned and pulled over upper part after the release of the tensioning nippers. lays the projecting marginal portions of the upper part over theAlast edge and the inner sole, in which position the said marginal portions y'are tacked to the inner sole by iixing means,r bythe use of an adhesive or the like means.' With this object in view the shaping device consists usually of a flexible band which is pressed 'by ra system of levers or by .springs against the pe'-A riphery of the shoe, whilst the wipers are formed by two at pieces of iron, the shape Iofwhich corresponds to that of the shoe toe or of the heel part and which are moved forwards and hack' wards with respect to the sho'e last and atlthe same time perform a swinging closing motion. The shaping device and the wiping device are ar'- ranged in the usual manner in a common arm, to which is imparted a swinging motionin the direction towards the shoe to be operated on, in order Ato bring about thepulling over actionyof thewformeron the upper part in the direction towards the last edge. y .v ,Y rlhis swinging motion of the arm supporting the shaping and smoothing device, the` closing :of the former, the pushing forward and the closing of the wipers has hitherto been eiected'indef pendently in each` case by a complicated system of levers, pull rods and gear wheels from cams, a Seperate @am ,being previded fory @een O f these motions. In view of various inaccuracies ,in the material formingthe-upper parts, the lasts and the like, it is necessary to make the positive lInction of the said parts, that is, the arm, the former and the wipers, yielding within a certain range, in order that the material of the upper part shall not: be damaged by the action of the;de vices. With this object in view yielding members are interposed in the system of driving levers. .'-Ih'e give in the positive drives of .the devices is, fh'owever, not sufficiently great' toA render unnecessary and adjustment of the drivesuor the former, and the wipers, when changing from one kind The smoothing. ydevice wipes and then the known pulling over machines.

2 or size of shoe being operated on to another. For these reasons the whole construction vof `the devices becomes very complicated and, lconsequently, also uneoonomical. Furthermore, the employmentof the positive Adrive of theiormer, the wipers and the common arm, which is yielding only to a limited extent, necessitates the shoe being fixed rvin thevmachinezvery accurately.v For this purpose it iis the'usual practice to .provide the la'st and also the inner sole with bores, by means of which the exact position in the shoe holder is ensured by pins. Y

According to the present invention .a considerable simplication of 'the driving means of the former, the wipers 'and the arm itself together with a substantial reductionv of the danger of injury to the upper part, a simpler manipulation both of the work and of the machine is eiect'ed, The essential feature of the present invention is, that thedrive of the former, the wipers and the common arm itself supporting 'the operating device is effected hydraulically in such a manner that parts of the operating devices are in direct connection withthge piston rods of pressure cylinders intended for thev control of these devices, the operative strokes Vof individual partsnot ,being ,determined from kthe outset, but .proceeding up' to impact against the work and thus adapting themselves automatically to the shape and size of the latter. The consequence of this is, that, on the one hand, the usual adjustment of the devices `for different shapes and sizes of shoe becomes superuous and, on the other hand, the shoe kcan beplaced in the .machine in the usual', simple manner, merely so that it `bears against a. toe stop on the shoe holderand with the marginal portions of the upperv .part inserted between the nippers, as is' done',` for instance, in The pressure cylinders for the control of the wipers are. mounted directly in the swingable arm, so that any necessary dismantling .is very simple. For a toe tacking'machine the ,former is preferably made suchv that it embraces the forward part' of the shoe from the rtoe to the waist part. A Further advantages and'features of thepresent invention will be gathered from the description of a constructional example according' to the invention with reference to the' accompanying draw ings, in which:

v`Figure 1 is a' ,partial longitudinal section through the shaping and smoothing device of a to'e tacking machine;

Figure 2`a1plan viewof Figure 1` seen from above and which shows in its upper part a toe former and wiper extended and in its lower part the toe former and wiper retracted, and

Figure 3 a cross-section of Figure 1.

The shaping and the smoothing device is mounted on the common swingable arm which itself is adapted to turn about the pin 2 fixed in the machine frame. The longer arm of this twoarrned lever is forked and has at its end a head 3 with the actual operative devices, whilst to the shorter end is xed a block 4 with pressure cylinders.

In the head 3 which, viewed from above (Figure 2), has the form of a Y there are provided in the two side parts keyways 5, each of which acts as a guide for a cranked bar 6. These bars are connected by means of grooved seating faces 1 and screws 8 each with a pull bar 9. By adjusting the grooved seating faces the length of the connection between the pull bars 9 and the cranked bars 6 can be easily altered. The pull bars 9 are connected by couplings 8| with the piston rods of the pistons which work in pressure cylinders I2, I2 mounted in the block 4. Each of these cylinders has an inflow opening I3 and an outflow opening I4. The openings are in communication through forked pipe connections l5, |6 each with a common supply and outlet for the pressure fluid. On the bars 6 are pivoted on pins |1 link members |8 which by means of pins |9 are connected each with one end of the flexible toe former 29 which is in the shape of a U and consists of a resistant, but yielding material. By a pin 2| the former 28 is rigidly connected with the head piece 3 of the swinging arm in the toe part.

In the middle part of the head piece 3 there is provided a guide 22, in which a slide 23 is slidable (Figure 3), to the pin 24 of which (Figure l) a pull bar 25 is attached, which is connected by means of a pin 26 with the piston rod 21 of the piston 28 which operates in the pressure cylinder 29 mounted in the block 4. In the slide 23 is a'dove-tail groove 38 (Figure 3), in which a further slide 3| slides, which is connected by means of the pin 32 (Figure l), the pull bar 33 and the pin 34 with the piston rod 35 of the piston 38, the latter operating in the pressure cylinder 31, also mounted in the block 14. In the slide 3| are inserted two vertical pins 38 (Figure 3)', on which are pivoted from below two link members 39 which are connected by means of pins 40 each with a circular projection 4| (Figure 1) forming parts of the actual wipers 42. When the tacking is to be carried out by nailing, these wipers 42 are provided with a row of holes 43 (Figure 2) through which the nails pass, when being driven in. The circular projections 4| (Figure 1) of the Wipers 42 are guided in a circular groove 44 of the slide 23 and are secured from below by a supporting plate 45. The to and fro motion of the slide 3| in the guiding groove 30 of the slide 23 therefore also produces a circular motion of the wipers 42 in the slide 23. The cylinder spaces 29 and 31 in front of the pistons 28 and 36 are in communication with one another through a `duct 46, whilst the spaces behind these pistons nected by pins 54 with the piston rod 55 oi the piston 58 working in the cylinder 51. The pressure cylinder 51 is mounted so as to be capable of rocking about a pin 58 fixed in the machine frame. The pin 54 is also pivoted in a bar 59 which is adapted to swing about a pin 69 iixed in the machine frame. The bars 5D, 53, 55 and 59 thus form a toggle lever system which together with the working cylinder is ro-tatable about the pins 58 and 60. As will be seen from Figure 1, in the working position the bars 59 viewed from the side come into alignment with bars 53 and 59. Connections 83 and 84 lead to the pressure cylinder 51.

In order to make a swinging motion of the arm impossible, when no work is clamped in the machine, the arm is in such a case secured directly by the support 6| (Figure 1) which is guided in a cylindrical guide 62 in the standard 63 and is acted on by a spring 6.4 which seeks to keep it forced upwards. The spring 64 at the same time takes a pin B5 along with it, which at its lower end supports a small block 66 which is guided in a fork 61 of the two-armed lever 68. The two-armed lever is pivoted about the pin 69 and with its second arm engages in a slot 10 of the horizontally slidable plate 1|, the righthand end of which comes into engagement with the teeth 12 of the bars 59, on being displaced to the right, and thus prevents a downward movement of these bars 50. Only after the support 5| has been forced down, through the shoe being placed on and pressed against the support 6|, will the lever 88 be swung by means of the pin 65 in the clockwise direction with a consequent displacement of the plate 1| to the left, so that the bars 50 are released. The support 6| is secured against turning by a screw engaging in a groove 88 of the cylindrical guide 62.

The pressure-applying movement of the pressure-applying pad 13 against the shoe placed on the support 5| is also derived 'from the downward movement of the arm The pressure-applying pad 13 is supported in a known manner so as to be vertically adjustable in a two-armed lever 14 which rocks about the pin 15 in the head piece 3. Mounted so as to rock on the same pin 15 is also a hollow arm 15, the cross-sectional form of which is seen in Figure 3 and which covers the right-hand arm of the lever 14. The lever arm 16 carries at its right-hand end a roller 11 which is in engagement with a cam surface 18. The arm 18 and the right-hand end of the lever 14 are connected with one another by means of a pin 19 and a spring 89 yieldingly in such a manner that, on the arm 16 swinging in the counterclockwise direction, the spring 89 is compressed, on the pressure applying pad 13 bearing against the shoe, and so protects the upper part of the shoe from being overloaded.

The described arrangement operates in the iollowing manner:

Before the shoe is placed in the machine and during the time in which the tensioning nippers are acting on the upper part the arm together with all its associated devices stands in the upwardly rocked position which is shown in dotted lines in'Figure 1. All the pistons of the working cylinders |2, I2 (Figure 2), 29, 31 and 51 (Figure 1) are in their right hand extreme positions, the shoe former 28 and the wiper 42 are open, as shown in the lower half of Figure 2.

Through admitting pressure fluid into the cylinder 51 through the supply pipe 83 and connecting the pipe 84 to the outlet, the piston 56,

as shown in Figure 1. The bars 50 had previous ly been released from engagement with the plate 'Il through the depression of the support 6I, 'on the work being placed in position and the plate 1I displaced,` as already described above.

vDuring the downward movement of the 'arm I`l the roller 'I1 of the lever f6 rolls on the ca'rn surface 'I8 and rocks thev lever 'IS- about the pin 'I5 in the counter-clockwise direction, At the same time the arm 'I6 by means of the pin I9 and the spring 8'0 vcarries the 'two-armed lever 'i4 along with it and rocks the' latter inthe same direction about the pin 15. Through `^this movement the pressure-applying Apad 'I3 is pressed against the shoe toe which is thus viirrnl'y clamped between the pressure-applying pad i3 and 'the support 6I. The application pressure of the pad 13, corresponds to the force of the spring 8B; since the pressure-applying pad Y'I3 adjusts itself ver tically in such a manner that the swing of the lever IB- is greater than the swing of the twoi armed lever T4, the movement of which is ended by the pad 'I3 coming to bear on the shoe, whereas the movement of the lever 'i6 continues, at the same time compressing the spring 3i).

While the lever arm I is still descending and as soon as the point of theV former reaches the toe of the shoe, the closing movement of the former 2U commences, which is brought about through the admission of pressure uid intothe cylinders I2, I2 through the fpipel The pistons II of the pressure cylinders I2, I2 commence to move to the left and by means of the piston rods I0, the push bars 9, the cranked bars 6 and the link members I8 initiate the closing mot-ion of the former 20; The working strokes of the pistons II of each cylinder only come to an end, when the associated side of the form 2B bears fully against the shoe. Since the former 26 preferably extends to the waist of the shoe, that is to say as far as places, where the shoe is no longersymmetrical, the movement of the two pistons II will not end simultaneously, as that part of the former 20 which comes into action on the shoe at the place of the arch of the foot, has to travel a longer distance, as this part lies nearer to the middle of the shoe. Irrespective of which 'part ofthe former travels further, or which piston I'I performs a longer stroke, the pressing pressure of the former will be equally great on both sides, as the working cylinders I2, I2', owing to the common inlets Iy and I5, actually represent communicating vessels. Through the coaction of the closing movement of the former 2! with the continuing rocking motion of the arm I downwards, on the one hand the known and requisite pulling over of the upper part 'on the last `in the vertical direction is brought about and, on the other hand, a firm clamping of the upper part against the edge of the last is ensured, so that the stretched over upper part can finally be released from the known tensioning nippers which are not shown.

As soon as the arm I is in its lower position and the upper part is released by the nippers and is secured by the former 20 on the last in the tensioned position, the smoothing at the shoe toe by the wiper 42 can be initiated. For this purpose pressure uid is admitted through the pipes 6 48, 46 into the pressure cylinders 3T and '29, whilst the pipes 4l, 49 are connected 'to the outlet. The result of this is, that the wipers 42 which till then were open and together with the slideY 23 were displaced to the right, as shown in theV lower' half of Figure 2, now commence under the acftion of the working strokes of the pistons 28 and 3E to move to the left, for the time being still in the open state, towards the shoe. 'Since the pres sure cylinders 29 and 31 are in communication with one another through the duct 46 and form communicatingvessels, the same pressure acts on both pistons 28 and 36, so that the latter come mences to move simultaneously and at the same speed. Since the movement of the piston 28 to the left simultaneously causes a corresponding displacement of the slide 23 to the left in the guide 2.2 ofthe head 3, the simultaneous movement lof the piston will cause no relative displacement of the slide A3| in the dovetail groove 30 of theslide 23; n o closing movement of the Wipers 42 in the circular groove S4 will therefore yet take place. As soon, however, as the movement of the slide 23 is interrupted (in this case through the wiper 42 coming against the toe edge of the upper part of the shoe vprojecting downwards beyond the lower part of the last), the pressure in thepresfsure spaces of the working cylinders 29, '31 will immediately commence to rise. Since the slide 23 cannot for the time being move further, the pres-'- sure will commence to act on the piston 36 which, whilst the piston 28 has come to rest, moves further to the left and produces a relative movement ofthe slide 3i in the slide 23 to the left. In this relative movement the link members 39 force the wipers along the circular grooves 44 forwards,

which results in a closing of the wipers. The closing movement of the pushing members 42 is 0bstructed by the marginal portions of the upper part, which projects downwards beyond the edge of the last, and the wipers bend these marginal portions of the upper part over the edge of the last and fold them over one another under the last. During the bending over and folding toe gether the resistance offered to the wipers continuously increases, so that the pressure in the cylinders also rises and, under the reciprocal action between the pistons 28 or 36, according'tothe placement of the wipers to the left and the clos-v ing motion of the same is brought to an end through the projection 82 (Figure 1) coming' against the outer periphery of the shoe form'20. As this form through pressing against the shoe adapts itself to the shape of the shoe, contact bythe projection y82 ensures the correct position of the nail holes with respect tor the edge -1 of the shoe.

As soon as the movement of the wipers vhas come to' an end, the tacking of the upper part of the shoe on to the inner sole can be started in the usual Way, the xing means being driven through the holes 43 in the wipers. The nailing device may be of any known construction. When fastening by means of an adhesive is to be employed, no holes 43 are required in the wipers 42 and the sticking process may be carried out with the pressure of the wipers which for this purpose remain at rest for a certain time, according to the kind of adhesive employed.

After the completion of the fastening operation, whether this has been effected by nailing or with the aid of an adhesive, the arm I together with the shoe still clamped between the closed Wipers, the former and the pressure applying pad 13 swings upwards. About half Way through this swinging motion the pressure applying pad 'I3 is released through the co-action of the cam surface 'I8 with the roller 'I'I of the lever arm 15. The upward swinging motion of the arm I is brought about by the admission of pressure iiuid into the pipe 84, whilst the pipe-83 is connected to the admission of pressure fluid into the pipek I6 (Figure 2) of the cylinders I2, I2', whilst the pipe I5 is connected to the outlet, and before the swinging movement of the arm I upwards is ended, the opening of the wipers 42 and their return into the initial position takes place through the admission of pressure fluid into the cylinders 29, 31 through the pipe 49, whilst the pipe 48 is connected to the outlet. After the opening of the wipers 42 the shoe will have become completely freed in the swinging arm I and lies free in the open hand of the worker. After the arm I has been returned into the position shown in Figure 1 in dotted lines, a complete operation of the described arrangement is ended.

The supply of the pressure fluid to the working cylinders takes place with advantage through exible tubes and is regulated by slide valves of a known kind, which are automatically controlled by cams, for instance in the same way as the control of the pressure cylinders according to our concurrent patent application Serial Number 737,073.

We claim:

1. A shaping and smoothing device for shoeend tacking machines, such as toe-tacking machines, comprising: a common swinging arm, a exible toe former mounted on the common swinging arm, wipers on the flexible toe former, hydraulic pressure cylinders, and pistons working in the said cylinders for controlling the operative motions of the former and of the wipers., the flexible toe former and the wipers being directly connected with the said pistons, and the working strokes of the former and wipers proceeding up to impact against the work, so that they adapt themselves automatically to the shape and size of the work.

2. A shaping and smoothing device for shoe-end tacking machines, such as toe-tacking machines, comprising: a common swinging arm, .a flexible toe former mounted on the common swinging arm, wipers on the flexible toe former, hydraulic pressure cylinders, and pistons working in the said cylinders for controlling the operative motions of the former and of the wipers, the pressure cylinders for the former and for the wipers being mounted in the swinging arm itself, and the working strokes of the former and wipers proceeding up to impact against the work, so that they adapt themselves automatically to the sha-pe and size of the work.`

3. A shaping and smoothing device for shoe-end tacking machines, such as toe-tacking machines, comprising: a common swinging arm, a flexible toe former mounted on the common swinging arm, wipers on the flexible toe former, separate hydraulic pressure cylinders mounted in said arm for the two ends of the toe former, pistons working in the said cylinders for controlling the operative motions of the toe former, and common admisison and exhaust pipes connecting the pressure spaces of these cylinders, so that the pressures at both ends of the toe former always remain equal, even when the ends of the toe former move by different amounts. Y

4. A shaping and smoothing device for shoeend tacking machines, such as toe-tacking machines, comprising: a common swinging arm, a exible toe former mounted on the common swinging arm, wipers on the flexible toe former, a separate hydraulic cylinder for the forward and backward sliding motions of the wipers, a separate hydraulic cylinder for the closing and opening motions of the wipers, pistons working in the said cylinders and connected to the wipers for controlling the operative motions of the wipers, ducts establishing communication between the cylinder spaces in both cylinders in front of and behind these pistons, so that pressure on both pistons can be applied simultaneously to advance the wipers into contact with the toe without closing movement and thereafter to impart closing movement and further advancing movement till the maximum pressure in both working cylinders is fully reached.

5. A shaping and smoothing device for shoeend tacking machines, such as toe-tacking machines, comprising: a common swinging arm, a flexible toe former mounted on the common swinging arm, wipers on the flexible toe former, hydraulic means mounted in said arm for controlling the operative motions of the former and of the wipers, a pressure-applying pad for firmly holding the shoe toe, a two-armed lever pivoted on said arm and supporting the pressure-apply-v JOSEF ZAORAL. VILM os'rRIL.

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

UNITED STATES PATENTS Number Name Date 1,323,714 Merrick Dec. 2, 1919 2,324,509 Jorgensen July 20, 1943

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