US1799996A - Pulling-over machine - Google Patents

Description

April 7, 1931.

K. WOLLNY PULLING OVER MACHINE Filed June 10, 1929 4 Sheets-Sheet l lnvegLgr W PULLING OVER MACHINE Filed June 10, 1929 4 Sheets-Sheet 2 Fig.2.

Ci \nvir fqr 7, 1 3 K. WOLLNY 1,799,996

I PULLING OVER MACHINE Filed June 10, 1929 4 Sheets-Sheet 3 APril 7, K. WOLLNY 1,799,996

PULLING OVER MACHINE Fila'd June 10, 1929 4 Sheets-Sheet 4 Fig.10.

Patented Apr. 7, 1931 UNITED STATES PATENT oFFicE KARL WOLLNY, OF WEISSENFELS, GERMJZNY, ASSIGNOB TO THE FIRM NOLLESCHE WERKE KOMM.-GES., OF WEISSENFELS, GERMANY rutmiveovsr. MACHINE Application filed June 10, lgzilperial No. 369,649, and inGermany July 2, 1928.

constructed that the closing and pulling off' the pincers can be effected at will either au- 10 tomatically or by a treadle, whilethe other. U

'20'on the lever 17 lifts the arm 11a of the lock movements of the pincers, as in particular the release and return to the starting point are in any case effected by the motor drive.

' After pulling, whether automatically or by 15 foot, the pincers are coupled to a lock device W which is controlled to release the pincers by a gear adapted to be separately coupled." The new arrangement also enables the pulling stage to be effectedin any desired order partly 2o automatically and partly at will. Pulling over machines are known in which thejautomatically stretched upper leather can be additionally stretched by hand, This arrangefond couphnglever' 12 is connected by a rod merit. is therefore not claimed per se herein.

The invention is illustrated in the accompanying drawings for the better understanding'of which attention is directed to the above mentioned prior specifications. 1

Fig. 1 is an elevation of the machine partly so in section.

Fig. 2 is similar to the lower part of Figure 1 but withcertain parts in a different position. i

Fig. 3 is a partial rear view of the machine. a) Fig. 4 is a plan of the machine partly in section.

' Fig. 5 shows the coupling of the motor drive to the pincers.

Figs. 8 and 9 show in elevation and hori- 6 is pivotedon a pin 8 and is urged against an abutment 10 on a lock lever 11 by a tension spring 9. A second lever 12 which is pivoted on a p111 13, 1s connected to the coupling lever 6 by a rod 1 1. A treadle 15 is socured on a rotatable shaft 16, which at one end carries a release lever 17 which is urged against a fixed abutment 19 by a tension spiinglS.

Upon depression of the treadle 15 a pawl lever 11 whereby the abutment is moved. downwards and the coupling lever 6 is released. The tension of the spring 9 draws the wedge 7 on the lever 6 outwards and the coupling pin 5 is pressed into the aperture 23in the driving disc 3 by a spring 22, whereby the cam shaft 4 is coupled up and its rotationi started.

: 'During the further rotation of the coupling a cam 23 actsupon a roller 24 and fbringsthe lever 6 with the wedge 7 aga into the uncouplingposition. Since the sectakes place before the coupling pin 5 has reached the wedge 7a. Upon reaching the wedge 7a the pin 5 18 again uncoupled after the-shaft i has first made a fraction, about None-third, of-a revolution.

actuation of the treadle 15 the two coupling levers again swing out, whereby the coupling is again engaged The shaft i completes the remainder of its revolution, and the pin 5 is again uncoupled when it reaches the wedge7; p y Y ;-By the provision of the two coupling levers which are connected together, the result isobtained that upon actuation of the treadle 15 the shaft 4: first makes for example only one-third of a revolution and then comes to rest, and then only makes the remainder of the revolution'upon a further actuationof the treadle 1 5. 1

By suitable adjustment of the lever12 the further result. can be iobtained that upon 'actuationof the treadle 15', the shaftt at Upon further 1 once makes a complete revolution. For this purpose the lever 12 is set so far outwards by rotation of the rod 14 which is provided with a right and left handed screw adjustment, that the wedge To in its innermost position no longer engages and withdraws the pin 5, so that uncoupling only takes place at one point, namely at the wedge 7.

Upon the shaft 4 are two cams and 26 for actuating the two similar lever gears for motor closing and pulling of the toe pincers and the side pincers respectively. Only the devices for operation of the side pincers are described below since those for the toe pincers are essentially similar. The Cam 26 ac upon the roller 2? of a lever 28. The lever 28 is pivoted upon a pin 29. This pin borne in slide blocks 30 which can move up and down in guides 31. A tension spring a 32 pulls on a spring lever 34 pivoted on the axis 33. This lever is hinged to the lever 28 by a pin 35. The effect of the spring 32 is to hohl the pin forming the fulcrum oi the lever 28 together vith the slide blocks 30 .j; forcibly at the upper end of the guides 31.

The lever 28 is in loose connection with a lever arm 37 through a divided slide block A lever a "m 39 is connected to the lever 37 by a common hub which is pivoted on a pin 33. The lever 39 rests loosely on a pin 40 in the pincer pulling lever 41. The pulling rod for actuating the pincers is mounted on the lever 41.

By means of a tension spring 43 the two lovers 37. 39 are held in their uppern'iost positions and the lever with its roller is forcibly pressed against the cam 26. The angular stroke of the lever 28 occasioned by the rotation of the cam 25 always has the same value. The divided slide block 36 is rotatable on the pin 44 of link 145. The slide block can be moved by a lever 45 loose on the shaft 4 and the linkage 46, 47, 48, the adjustment being maintained by the aid of a catch 49 engaging notches in the adjusting bar 43. By altering the position of the slide block 35, the angular stroke of the lever arms 37, 39, is increased or decreased and the st oke of the pincer stretching lever upon which the amount of downward movement of the pincers depends, also adjusted' The tension. spring 32 is attached to a lever 51 pivoted on a pin 50. By means of an adjusting screw 52 against which the shorter arm of the lever 51 bears, the tension of the spring 32 can be regulated. The spring tension is so adjusted that when the increased resistance which arises when the leather is fully stretched by the pincers occurs, the fulcrum support 29 of the lever 28 yields, the slide blocks 30 moving downwards in the guides 31. Vl hen this takes place the pin 44 of the slide block 36 acts as the fulcrmn.

WVhen the slide block 36 is adjusted to increase the stroke of the levers 37, 39, the tension of the spring 32 must be increased since the ratio of the distance pin 29roller 27 to the distance roller 27pin 36, upon which the effect of the spring tension at the point depends, changes. In order to avoid an additional adjustment by hand of the spring 32 after setting the slide block 36, an arrangement is provided by which the spring tension exerted on the lever 28 is automatically changed in the desired ratio during adjustment of the slide block 36. For this purpose the fulcrum 35 of the lever 34 is slidably arranged, in order to enable the lever ratio 3335 to to be varied, whereby the tension exerted at 35 is correspondingly varied. The pin 35 is provided on each side with a slide block 53,which blocks slide in the guides 54. The lever 34 is slotted at 55 to engage the pin 33 while. the limbs of the. forked end of a lever 57 pivoted on a pin 56 pass on each side of the lever 34 and prevent the pin 33 from sliding uncontrolled along the guides 55. The lever 57 is connected to the lever 45 by a link 58.

lVhen the slide block is adjusted by means of the bar 48 from the position shown in Fig. 1 to the position shown in Fig. 2, to obtain a short stroke of'the lever arms 37, 39, the fulcrum of the lever 34 also moves under the action of the lever 45, rod 58 and lever 57 from the position shown in Fig. l. to that shown in Fig. 2. The eli'ective lever arni 35-33 is thereby altered to correspond to the altered distance 27 to 44. so that tension ol' the spring 32 exerted at 35 upon the lever 28 remains substantially the same as in the previous setting.

In order to enable the pincers to be closed and pulled by the muscular power of the operator independently of or in common with the devices for motor operation of the pincers, the treadle 59 is provided. This is pivoted on a pin 60 sugported in an eye 61. The latter is pivoted on a pin 62 in a pedestal (53, so that the treadle 59 in addition to moving vertically about the pin 60 can also move horizontally about the pin 62. The treadle 59 is maintained in its upper position of rest, by means of a tension spring 64, and it is maintained in its horizontal mid position by means of a rod 65 secured to the pin 62 and two tension springs 66.

If both pincer levers are to be actuated without the use of the motor, the operator presses down the treadle 59, which engages abutments on the pincer levers 41, 41a thus pressing the levers downwards. Upon release the treadle is lifted by the spring 64 into its upper position of rest, while the levers 41, 41a remain locked in their lowered position by pawls 69 engaging in racks 70.

If now only the lever 41 for the side pincer-sis to be operated. the operator before depressing the treadle, presses it sideways into ill) the position shown in Fig. 7. Upon depression, only the lever 41 is engaged by the projection 67 and driven downwards. Similarly when the. treadle is pushed to the opposite side it engages only the lever 41a.

Method of, operation of the mac/tine The front end of the upper leather to be pulled over is first introduced into the open toe pincers. Then the treadle 15 is actuated, whereby the shaft 4 is coupled and makes about one-third of a revolution, then coming to rest again. During this partial rotation of the shaft 4, the cam actuates through a the linkage 28a, 37a, 39:; the pincer lever 41a for operating the toe pincers, whereby the latter are closed and drawn down a certain distance, in order to pull the leather slightly over the. toe of the last. At the end of this step the sides of the upper leather are introduced into the open side pincers and the pin coupling again engages by depression of the treudle 15, when the shaft 4 completes the remaining, two-thirds or thereabouts, of the revolution During this movement, under the action of the appropriately formed cams 25, 26, the side pincers first close and move downwards in order to pull the sides of the upper leather firmly over the last. During the descent of the side pincers the toe pincers complete their downward movement, so that at the end of this working stage the upper leather is firmly pulled over the last. Before the termination of the rotation of the shaft 4 the levers 28, 37, 39 return to their upper free positions, while the pincer pulling levers 41, 41a are held in their lower positions by the pawls 69 which engage in the rack 70.

If the leather is fully stretched before the downward movement of the levers 28, 37, 39 complete, the fulcrum 29 of the lever 28. which is forcibly urged upwards by the spring 32, yields thus avoiding further movement of the pincers and tearing of the leather. Accordingly as the leather is barely or amply suflicient, the pincer stroke is shortened or lengthened by adjustment of the slide block 36 by moving the adjusting bar 48. The tension of the spring 32 is adjusted by the screw 52 to suit the extremity and strength of the leather to be operated upon. The pressure exerted on the fulcrum of the lever 28 by the tension once set in this way remains substantially constant after adjustment of the slide block 36 to obtain a shorter or longer pincer stroke, owing to the action of the members 58, 57, coupled to the lever 45.

If the leather is not sufliciently firmly pulled over the last after the end of the downward movement of the levers 28, 37, 39, 41, the leather can be additionally stretched by the muscular power of the operator by his depressing the treadle 59; the toepincers and side pincers can be actuated separately by this-treadle action, or all the pineerscan operation, the couplinglever 12 is moved out of action by adjusting'the rOd 14 (Fig. 5). After this adjustment, upon a single depres sion of the treadlej15 the shaft 4 makes one complete revolution without interruption.

In this case the leather is previously intro- .duoed into all the pincers at once. Then in a single operation all-operations take place without interruption in the following orderclosure and pulling of the toe pincers closure and pulling of the side pincers further downward movement of all. the

pincers together. i 1

After the upper leather has thus been satisfactorily pulled over the last, the operator engages a shaft 71 for one revolution by means of. a hand lever 80, to effect inward and upward movement of the pincers and tacking to the insole as described and illustrated in-the U. S. Patent No. 1,688,556 and the British specification 239,890.

The shaft 71 is coupled through gear wheels 85, 86, 87, 89, with a disc mounted freely on'the shaft 1, which disc is coupled to the shaft by upward movement of a rod 84. This upward movement is effected by the hand lever 80 pivoted on a pin 79 the rod 84 being connected to the rear arm 83 of the lever- I In addition on the pin 79is pivoted an arm 78 which is connectedto a tension rod 75 by a pi n 77. The latter has a stirrup. 74 enclosing the shaft 4. On the stirrup is a roller 73 which co-acts with a cam 7 2fast on the shaft 4.. The camimparts a swinging zmovement to the. arm 78 through the rod 75. According to the invention thisswinging motion can be transmitted to the hand lever 80 andthecoupling rod84; For this purpose the arm 78 is provided with a removable pin-81 against which bears adownwardly directed arm 82 on the hand lever 80. If the pin 81 is removed the swinging of the parts 75, 78 remains without effect.

A spring acts to urge the rod, 84 downwards. In the lowermost position, a roller 93 on one end of an angle lever 92 pivoted at 91 rests in a corresponding recess in a disc 94, the other end of the angle lever having a toothed sector meshing with teeth on the rod 84. If the hand lever 80 is depressed, then simultaneously with the coupling of the shaft 71, the roller 93 reaches the periphery of the disc 94 which maintains the coupling during the rotation of the shaft 71 and at the end of the revolution automatically permits uncoupling.

What I claim is:

1. A pulling over machine having toe and side pincers, a continuously rotating drive shaft, a shaft driven therefrom for power operatingthe toe andside pincers, means for coupling said shafts constructed and arranged when first operated to actuate said toe pincers and when subsequently operated to actuate the side pincers, means permitting the adjustment of said last mentioned means whereby said coupling means will cause the toe and side pincers to be actuated upon a single operation of said coupling means, means for manually actuating said toe and side pincers either successively or simulta neously, anda separate shaft adapted to be coupled to said drive shaft forreturning the pincers to their original open position.

2. In a pulling-over machine a continuously rotating machine-drive, means operated by the attendant for closing and pulling the pincers by muscular power, a shaft to be coupled to'the machine-drive for automatically closing and pulling the pincers, and a separate shaft to be likewise coupled to the machine-drive for inwardly moving and re leasing the pincers;

3. A pulling over machine having toe and side pincers, a continuously rotating drive shaft, a shaft driven therefrom for power operating the toe and side pincers, means for coupling said shafts constructed and arranged when first'operated to actuate said toe pincers and when subsequently operated to actuate the side pincers, and means permitting the adjustment of said last mentioned means whereby said coupling means will cause the toe and side pincers to be actuated upon a single operation of said coupling means.

a. In a pulling-over machine, a motor driven lever for pulling the pincers, means for adjusting the effective length of the lever, an abutment for the lever, a spring holding the lever'upon the abutment, and means for automatically altering the influence of the spring with the adjustment of the effective length of the lever.

In testimony whereof I aflix my signature.

KARL lVOLLNY.

Images