US2174133A

US2174133A - Apparatus for making boots and shoes

Info

Publication number: US2174133A
Application number: US147545A
Authority: US
Inventors: Mayer Karl
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-04-29
Filing date: 1937-06-10
Publication date: 1939-09-26
Anticipated expiration: 1956-09-26

Description

' Sept. 26, 1939. K. MAYER APPARATUS FOR MAKING BOOTS AND SHOES 2 Sheets-Shet 1 Filed June 10; 1937 Sept. 26, 1939. K. MAYER 2,174,133

Y PARATUS F0 R MAKING BOOTS AND SHOES Filed June 10, 1937 2 She ets-Sheet 2 Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE APPARATUS FOR MAKING BOOTS AND SHOES Karl. Mayer, Frankfort-on-th'e-Main, Germany v 1 Claim.

The present invention relates to apparatus for making footwear. Heretofore, in theproduction of boots and shoes, the pulling over and the lasting of the margin of the upper to the insole has been carried out in two separate working operations on two separate machines. In accordance with this invention it has now been found that the manufacture of boots and shoes can be considerably simplified if the pulling over and the attaching of the margins of the upper are carried out simultaneously in one working operation.

In the accompanying drawings Fig. 1 is a plan view of the most essential parts of a known pulling over machine with which only the pulling over operation can be effected according to known methods while the attaching of the margins of the upper are carried out on a special toe lasting machine or an ordinary lasting machine which is not here shown.

Fig. 2 shows diagrammatically the pulling over of the toe of the shoe on the insole using the device shown in Fig. 1. r a

Fig. 3 shows the improvement in the pulling over machine in accordance with this invention with which the pulling over and the attaching of the margin of the upper to the insole can be effected in one working operation.

As shown in Figs. 1 and 2, a pulling over machine of previously known type consists essentially of the following parts, namely, the last support I in front of and adjacent which are mounted the grippers 2 by which the margin of the upper is gripped and in the pulling over operation drawn tightly downwards. Externally of each of the grippers 2 is mounted a driver bar arm 3 with a support 4 and over the lateral driver bar arms are mounted laterally pivoted presser arms or wipers 5 on which are mounted rubber cushions B.

The pulling over operation with the arrangement shown in Fig. 1 is effected by first mounting the last I on which the upper 8 is placed on the support I and inserting the edge of the margin of the upper projecting beyond the last in the jaws of the grippers 2. The grippers are then closed and are moved somewhat downwardsso that the upper is drawn taut on the last 7. Thereupon the presser arms or wipers 5 are moved towards the last 1 and press with the rubber cushions 6 at the top and laterally on the upper. Thereupon the driver bar arms 3 also move towards the last after the necessary number of nails have been passed through the nail channels 9 from the tack passage to the tack feeder. .By the movement of the driver bar arms 3 towards the last the upper is laid around the insole, the grippers open and the margin of the upper is released. After the driver bar arms have been moved sufliciently far beneath the insole and the margin of the upper has been laid around 5 the insole then the tacks from the tack feeders are driven into the margin of the upper by the drivers moving in the driver bars so that the margin of the upper is attached to the insole at three places. The upper thus attached is then removed 10 with the last from the machineand inserted in a toe lasting machine in which the margin of the upper is either drawn or turned in by means of wipers on to the insole and secured by nails or the margin of the upper is drawn on to the insole 15 step by step by means of a lasting machine and nailed also by means of tacks.

According to the invention the pulling over machine shown in Fig. 1 is modified by mounting on the driver bar arms wipers III which can be swung'laterally' about a common pivot II which is provided on the forward driver bar arms3; For this purpose the wipers Ill are provided with adovetailed guide groove l2 in which moves a pin I 3 which is secured at its upper side to the driver bar arms.

The modus operandi of the new arrangement is as follows:

In the first place after the upper 8 has been reinforced by a cap stiffener which in its softened condition has a high adhesive property and is placed on the last 1, the last with the upper is placed on the support I and the margin of the upper projecting beyond the last is introduced as usual into the jaws of the grippers 2. By lowering the closed grippers the upper is first drawn down tightly on the last and the presser arms 5 are again closed to such an extent that the rubber cushions 6 hear from above and laterally on the upper and hold it on the last. In lieu of attaching the margin of the upper by tacks to the insole, in the new arrangement by the above mentioned closing of the driver bar arms on which the wipers II] are slidably secured, the margin of the upper is turned around the insole throughout the whole length of the toe. The movement of the driver bar arms thus corresponds exactly to the movement of the driver bar arms of the known pulling over machine and also to the movement of the wipers in the toe lasting machines which operate with wipers. By the closing of the wipers. It, the margin of the upper projecting beyond the last is pressed forcibly on the insole so that some Of the impregnating material of the cap stifiener is pressed through the shoe material to the insole as a result of which adhesion between the margin of the upper and the insole is attained. In order to obtain quick adhesion of the wiped margin of the upper with the insole the said wipers ID are provided with suitable heating means, for example electric heating means M by which the wipers can be brought to the desired temperature. As already mentioned above for carrying this method into effect stifiening materials are preferably used which in softened condition have great adhesive power as is the case with cap stiffening materials of felt which is soaked with a mixture of nitro-cellulose and artificial resins such as polyvinyl compounds. These cap stiifeners have in addition to their high adhesive properties also the advantage that they are easily deformed and can be lasted on the insole without creasing.

After the margin of the upper has been pulled on to the insole in one working operation and the desired adhesion to the insole obtained, the wipers ID are again opened so that the shoe can be withdrawn from the machine.

In order to ensure that in the said adhesion between the margin of the upper and the insole the margin of the upper will be pressed on the insole with a greater pressure than that obtained solely by closing of the wipers, an additional device may be provided in the machine for example an eccentric bolt by which the last support I can be moved downwards, so that the last with the upper is pressed downwards by the spring pressed presser arms 5- and pressed on to the wipers I0 so that any wrinkles in the margin of the upper are pressed out.

The advantage of the new arrangement consists thus in this that tacking is entirely dispensed with and that'in the pulling over operation the upper is secured not at three places only to the insole but is caused toadhere uniformly to the insole .over the whole length of the'toe, so that the lasting operation on a separate 'machine hitherto necessary is dispensed'with,

A further advantage of the new arrangement also consists in this thatapart from dispensing with the hitherto necessary lasting machines and their operatives-the output of the shoe factory is increased as with the new arrangement there can be turned out at one time the same amount of work as that for which hitherto a pulling over machine and four lasting machines were required.

In manufacturing shoes and boots with the apparatus according to this invention, insoles may be used which have been previously coated on their edge with a binding medium and if desired again dried such as for example the impregnating material for the cap stifiener.

It is self-evident that in the new arrangement the driver bars in the driver bar arms can be dispensed with. However the arrangement of the driver bars in the driver bar arms can also be maintained and the wipers H! can be provided with slots, through which the driver bars work,

so that in closing the machine the margin of the upper is not only turned in and adhered on the insole by the wipers, but is also nailed thereon by the driver arms.

I claim:

Apparatus for drawing a shoe upper on a last and permanently attaching the margin of the upper to the insole in a continuous sequence of operations comprising, a last, grippers for gripping the margin of the upper and drawing the upper about the last and adjacent the edges of an insole in assembly position, a driver bar arm at the tip of the insole, driver bar arms adjacent the side edges of the insole, a pair of wipers pivoted together on the tip driver bar arm, the wipers being mounted on the respective side driver bar arms to be swung closed and rearwardly to press the margin of the upper on the edge of the insole and then to be opened, said wipers having heating means to heat adhesive at the line of connection between the upper and insole to permanently secure them' together.

KARL MAYER.