DE2146896C3 - Device for manufacturing footwear from elastomeric material - Google Patents

Description

The invention relates to a device for producing footwear with a cap, shaft and Soling made of elastomeric material which is flowable before the hardening process, the device being made of a Lasts, molded parts for shaft, cap and soling and a holder therefor. At this Device can be the flowable mass used from thermoplastic material such as PVC or also made of vulcanizable rubber or rubber-like material. Polyurethane too can be used as sole and cap material. Polyurethane includes polyester and To understand polyether urethane. The invention therefore extends to a device in which the molding process in the heat with vulcanization, Crosslinking or curing of the elastomeric material is going on.

In the production of footwear made of elastomeric material, which preferably has an upper made of textile fabrics, presses are used for which there are separate molded parts for the sole and cap area. These are mostly Components of a table. The bar is held by an inclined axis that is independent of this. At two opposite strips are provided on the axis. One of the bars is located each in the shape, the other is exposed for fitting with the shaft material.

The suspension of the bars over the common axis is in a separately controlled one Device that can be moved independently of the molded sole and cap part A disadvantage of this structure this device, also known as a heating press, is that precise adjustment of the last on the free mounting in the form is difficult to achieve. In particular, signs of wear and tear lead to the necessary clearance in the joints that the sole and cap have a wall thickness that deviate from the required and desired dimension. This change in wall thickness had to be done up to now be accepted. Leaks at the edges of the molded parts lead to budding. This must be removed and involves additional labor costs.

Although a device of the design described at the outset is known, this device has the task of uniting the manufacturing processes of the upper and sole so that these Device can also be used on rotating mold tables with injection cylinders. At this Device, however, no measures have been taken to ensure accurate and consistent wall thicknesses blaze footwear to achieve. In this publication Also, no means are shown that the shifting of the moldings against each other as a result of one-sided prevent high pressure loads.

The object of the invention is to subject the design of the heating press to such a change, that an extremely precise wall thickness is maintained in the sole and cap material can that a very precise readjustment is possible in the event of signs of wear on the molded parts and that this change also leads to a further simplification in the structure of the press

To achieve the object, it is provided according to the invention that the axial displacement of the last occurring under the pressure of the bottom stamp is over the strip head and the common one-piece holder for the strip head and the molded parts is coupled to the molded part without loss

With this measure, the dimensions are between Last head and the inguinal foot part very precisely

adjustable. Furthermore, the bracket creates from one

Piece one that can be carried out with greater certainty Workflow. The one-piece bracket sets

namely, on the one hand, edit the head of the bar with precision ten guides in a specific position, which is also for the last foot is mandatory so that the molded parts a extremely precise location received.

The essence of the invention is that

the displacement of the groin under the pressure of the

Headstamp by coupling the together in Connected parts to the molded parts without loss

for cap and barrel. The one in the

Manufacture of the footwear lying variations

only have an influence on the situation under these conditions of the various molded parts to each other.

In the case of the bracket, the strip head can be used as a

be designed removable fitting. It is with the

Bracket firmly connectable, so that no Deviations can occur. This adapter

makes it easier to open the mold and makes it possible

Exchange of different types and sizes of strips. Under these circumstances, changing the Last limited to a minimum of molded parts. The replacement can also be relatively quick

take place.

The fitting piece is expediently screwed to the strip in the strip axis tied together. This screw connection makes it possible to insert thin intermediate plates in order to achieve a right height to create the exact location for the foot part of the last opposite its outer moldings. Around To ensure the greatest possible stability against lateral pressures, the fitting piece on the head of the bar can be in be embedded in the bracket part. The bearing surfaces hs of the fitting piece in the holder are preferably with Soft metal, such as brass or the like. Equipped so that, despite temperature differences, a smooth, backlash-free and firm system is always obtained.

In a further embodiment of the invention, the one-piece bracket with a support frame be provided. This sets the position of the molded parts for the soling and the toe in the desired position Height fixed, so that also at this point when shooting the shape is constantly taken care of for an exact guidance.

The invention is described in connection with two figures, for example. The illustrations show a cross-section through the form including its holder.

In A bb. 1 is the last I with its adapter 2 in the strip head 3. This is via the connecting pieces 4 and 5 with the diagonally not shown Axis connected for the second ledge. The sole part 6 is -by the two in the longitudinal direction split moldings 7 and 8 formed These moldings hang on an axis 9, which is not a second The soleplate shown contributes to the definition the last in its position, the bracket 10 is used, as this both the last head 3 and for the Frame provided molded parts 7 and 8 firmly comprises This bracket 10 consists of one piece and is to to enable the opening process, only divided in the longitudinal direction. However, the holder 10 necessarily overlies the corresponding machine parts the upper and lower end of the strip fixed The strip head 3 has at 11, 12, 13 and 14 soft metal inserts aui to ensure a smooth and to enable firm guidance of the strip head 3 in the mounting parts 10. The support frames 15, 16 and the lower contact points 17, 18 hold the molded parts 7, 8 for the strips 1 in an unchangeable manner

ίο work situation. The molded parts 7, .8 are therefore over the part 10 fully fixed between the fitting piece 2 and the strip head 3 is a thin plate 19 of certain Strength inserted and fastened under screwing so that the height of the inguinal foot in the lower Formteiien 7 and 8 can be fixed down to a fraction of a millimeter in the farm If required, they can be replaced by panels of different thicknesses in order to meet the wall thickness requirements for the Cap part to meet.

The A b b. 2 shows a section to A b b. 1 in a slightly different version. In the case of application upcoming last, it is in particular the production of a sports shoe.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Apparatus for the manufacture of footwear with toe, shaft and sole of elastomeric material which is flowable before curing, wherein the Device consisting of a last, molded parts for shaft, cap and sole and a holder for this purpose, characterized that the axial displacement of the strip (1) occurring under the pressure of the bottom ram the strip head (3) and the common one-piece holder (10) for the strip head (3) and the Molded parts {7, 8) loss-free with the molded part (7, S) is coupled 2. Apparatus according to claim 1, characterized in that the molded part (7,8) on the support frame (15, 16) of the bracket (10) is supported. 3. Performing according to claims 1 and 2, characterized in that between the strip head (3) and the holder (10) for the strip head (3) Spacers (11-14) are arranged.