US3828385A

US3828385A - Apparatus for assembling shoe parts

Info

Publication number: US3828385A
Application number: US00349313A
Authority: US
Inventors: F Jancik; J Polach
Original assignee: Svit np
Current assignee: Svit np
Priority date: 1972-04-07
Filing date: 1973-04-09
Publication date: 1974-08-13
Anticipated expiration: 1991-08-13
Also published as: DE2311669A1; DD103554A5; GB1413759A; CS157950B1; IT980615B

Abstract

Apparatus for covering shoe parts, such as molded insoles particularly, in which a frame has supported thereon a screw wiper arranged behind a pair of adjacent frusto-conical inner and outer pulling rolls. A presser means, such as a presser disk, is supported on a piston rod of a pressure cylinder containing a labyrinthine piston, the pressure cylinder being located below the screw wiper and pulling rolls, and movable in an axis parallel to the line of engagement of the pulling rolls.

Description

United States Patent [191 Jancik et al.

APPARATUS FOR ASSEMBLING SHOE PARTS Inventors: Frantisek Jancik; Josef Polach, both of Gottwaldov, Czechoslovakia SVIT, narodni podnik, Gottwaldova, Czechoslovakia Filed: Apr. 9, 1973 Appl. No.: 349,313

Assignee:

Foreign Application Priority Data Apr. 7, 1972 Czechoslovakia 2312-72 US. Cl. l2/24.5, 12/8.3 Int. Cl. A43b 5/12, A43b 13/28 Field of Search 12/1 B, 8.3, 24.5, 1 R

References Cited UNITED STATES PATENTS 7/1907 Eaton l2/24.5

[45] Aug. 13, 1974 2,400,074 5/1946 Christiansen 12/24.5 2,576,121 11/1951 Kamborign 12/8.3 3,561,027 2/1971 Dunlap et a1. l2/8.3

Primary Examiner-Patrick D. Lawson Attorney, Agent, or Firm-Murray Schaffer [57] ABSTRACT Apparatus for covering shoe parts, such as molded insoles particularly, in which a frame has supported thereon a screw wiper arranged behind a pair of adjacent frusto-conical inner and outer pulling rolls. A presser means, such as a presser disk, is supported on a piston rod of a pressure cylinder containing a labyrinthine piston, the pressure cylinder being located below the screw wiper and pulling rolls, and movable in an axis parallel to the line of engagement of the pulling rolls.

7 Claims, 7 Drawing Figures PMENTEB N 1 3 I 74 SHEEI 1 BF 2 APPARATUS FOR ASSEMBLING SHOE PARTS BACKGROUND OF THE INVENTION This invention relates to apparatus for covering shoe parts, and in particular to apparatus for joining molded insoles and the like.

Up to the present, the covering of shoe parts such as molded insoles and the like, has largely been accomplished with hand tools such as properly arranged hammers, polishers and the like. The use of hand tools is hard work and also has low production levels. Moreover, hand tools of this type cause painful bruises to the operators hands. On the other hand, bordering machines are used for covering only those types of molded insoles having a rigid core. Generally, such bordering machines have reciprocable wipingfingers which bend only the margin of the covering material as a result of the fingers oscillatory movement. These machines are, however, quite complicated and expensive and their productive capacity insufficient. In addition, the operators of such machines must employ considerable energy when feeding the material to such machines. Furthermore, these machines are extremely noisy.

Machines for covering shoe parts. are also known where the shoe parts are pressed against and into a soft, elastic pad, such machines being suitable for covering only relatively rigid parts which are resistant to undesirable deformation.

Machines are also known which are suitable for covering rigid skeleton shoe partsor elements, such as, for example, wiping the margin of the shoe upper when lasting. Such machines generally include working means which consist of a screw wiper, arranged behind a pair of adjacent frusto-conical pulling rolls. When using this type of machine, the operator has to constantly guide and feed the workpiece, that-is, the last with the lasted shoe upper. Thishas a distinct disadvantage.

It is the object of the present invention to provide an apparatus for covering shoe parts which obviates the aforementioned disadvantages.

It is another object of this invention to provide apparatus for covering shoe parts employing a presser means located under the screw wiper and pulling rolls to feed and guide the workpiece.

It is another object of the present invention to provide apparatus for covering shoe partsemploying a presser means supported on a pressure cylinder including a piston and rod associated therewith, located under the screw wiper and pulling rolls to feed and guide the workpiece.

It is still a further object of the present invention to provide apparatus for covering shoe parts employing a presser means supported on a pressure cylinder having associated therewith a labyrinthine piston supported on a piston rod, the pressure cylinder being located under the screw wiper and pulling rolls.

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings which are to be taken in conjunction therewith.

SUMMARY' OF THE INVENTION In accordance with the present invention an apparatus for coveringshoe parts such as molded inner soles is provided comprising a frame, a-screw wiper supported on the frame located behind a. pair of adjacent frusto-conical inner and outer pulling rolls supported on the frame, and presser means supported beneath the screw wiper, the presser means to urge the inner sole assembly against and into the pulling rolls. The presser means is preferably a disk freely rotatable and movable upwardly on an axis parallel to the engaging surface lines of the pair of pulling rolls.

Preferably, the pressure disk is forced or biased by a pressure cylinder including a piston arrangement supported on the frame below the pulling rolls. Preferably, a guide is also provided for the insole assembly. The side backing edge of the guide is parallel to the axis of pressure cylinder. The guide also has an upper triangular portion which fills the space between the inner and outer pulling rolls and the screw wiper. Alternately, the outer pulling roller may. be provided with a plumb point member conjointly rotatable with it. Further, at a level equal to the bottom edge of the inner pulling roll there is arranged an infeed guide foot. The pressure. means, such as a pressure disk, is supported on the piston rod of the pressure cylinder, which also defines the axis of rotation and directional axis of force of the pressure disk.

Full details of the present invention are set forth in the following description and in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is an isometric elevational view of an apparatus of the invention;

FIG. 2 is an elevational view partially in section of the apparatus in FIG. 1, showing in greater detail the working mechanism thereof;

FIG; 3 is a partial isometric view of the working mechanism of the apparatus of FIG. 1 and showing an insole assembly under construction;

FIG. 4 is a plan view shown partly in cross-section through the pulling rolls and the insole assembly;

FIG. 5 is a partial view in elevation of the pulling rolls showing a modified guide partially in section;

' FIG. 6 is an isometric view of a molded insole assembly before being joined with the apparatus of the invention; and

FIG. 7 is a cross-sectional view through an insole after covering with the apparatus of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now more particularly to FIG. 1, the apparatus according to the invention includes a frame 1 on which there is rotatably mounted an inner pulling roll 2 and an outer pulling roll 3, as shown more particularly in FIG. 2. The

pulling rolls

2 and 3 comprise counter-rotating frusto-conically shape heads having their surfaces splined or threaded and are arranged to be mutually engagable along parallel surface lines 4 and 5 with the covering material M of the inner sole assembly S, as shown more particularly in FIG. 5. The pulling rolls are mounted at the end of a vertically reciprocable shaft and their position is adjustable by means of screw 6 shown in FIG. 2. At a level even or coplanar with the bottom edge of the inner pulling roll 2 and outer pulling roll 3'as shown more clearly in FIGS. 2 and 3, there is rotatablymounted a helical screw wiper 7, which is disposed horizontally in the frame I and is axially adjustable by means of screw 8. The shafts of the screw wiper 7, inner pulling roll 2 and outer pulling roll 3 are connected with conventional transmission means such as gears and belts to suitable motor drive means, not shown, so that they cooperate to continuously pull the material M, bend it over the core V of the inner sole and by action of the wiper 7 to flatten and press the bent edge firmly into place on the core, while turning the assembly S about its periphery.

As shown in more detail in FIG. 2, a pressure disk 9 is freely rotatably and reciprocably mounted beneath screw wiper 7. The pressure disk 9 is fastened to a piston rod 10 on which a labyrinth sealed piston 11 is disposed, the piston rod and labyrinthine piston being reciprocably located in a double acting pressure cylinder 12. Pressure cylinder 12 is mounted in a tilted position with respect to frame 1 by bolts 13, being tilted to a position such that the upward axis of movement of disk 9 defined by rod 10, is parallel to the mutual engaging surface lines 4 and 5 of the pulling rolls (FIG. 5).

The conical shape of the face of the pressure disk 9 is formed to correspond to the shape of the molded insols S to be covered. Actuation of the cylinder 12 will draw the pressure disk 9 toward or away from the planar frontal edges of the

pulling rolls

2 and 3, and is adjustable to compress a molded insole S formed of a core V and covering M for it against the pulling roll 2. The conical face of the disk 9 is shaped so that in cooperation with the pulling roll 2 the shape of the insole S is maintained.

The pressure cylinder 12 is provided

inlet conduits

14 and 15 to supply a suitable fluid pressure medium thereto. The

conduits

14 and 15 are connected to a valve distributor which is controlled by a foot lever 16 as shown in FIG. 1, and includes means for continuously exerting the pressure on the piston 11 in either direction depending on actuation of the foot lever 16, to thus lock the piston in one or the other direction in use. The fluid pressure medium is sufficiently resilient to hold the material without damage and is therefore self-adjustable to the actual thickness of the insole assembly.

A guide 17 (FIG. 4) is fastened to the frame and extends under the outer pulling roll 3. The frontal edge 18 of the guide against which the material backs is parallel to the axis of the piston rod 10 of the pressure cylinder l2 and its upper part 19 is triangular shaped to fill the space between the outer pulling roll 3, inner pulling roll 2 and screw wiper 7. The backing edge 18 of the guide. may be replaced by a conical member such as the pointed plumb 21, as shown in FIG. 5 which is arranged on the same shaft as and is simultaneously rotated with, the outer pulling roll 3. Minor modification of the guide 17 is only necessary in this form.

In front of the inner pulling roll 2 and level with its bottom edge there is mounted on the frame 1 a guide foot 20.

The covered insole S formed by the apparatus of the present invention is seen in FIGS. 6 and 7 and comprises a core V such as foamed plastic, leather, rubber or the like, covered by a layer of material M such as plastic, leather, composition paper, etc. Before the covering operation takes place, the covering material M is provided with a suitable adhesive. The core V can be likewise provided with adhesive if desirable or neces sary.

The various mechanical linkages and movements not shown in detail in the apparatus of this invention are well known elements normally utilized in machine design and may be varied in construction to provide suitable machine parts useful in the apparatus of this invention.

The apparatus described operates as follows:

A source of power such as an electric motor is energized and the screw wiper 7, the inner pulling roll 2, the outer pulling roll 3 begin to rotate, the latter rotating in a direction opposite to the former. The operator takes the core V, which was previously concentrically laid on the covering material M and bends the part of the shank margin slightly towards the side wall of the core V. The so prepared molded insole is then put on the pressure disk 9, which is, at this time in its bottommost position. The bent margin of the covering material M is then pushed between the rotating inner pulling roll 2 and the outer pulling roll 3 by the operator, who simultaneously depresses the foot lever 16. The valve distributor is thus caused to move the pressure disk 9 into the position by the supply of pressure medium beneath the labyrinth piston 11 through the inlet conduit 15. The piston 11 is allowed to flow to waste from pipe conduit 14. The pressure disk 9 then urges the molded insole assembly S against the screw wiper 7, as well as against the upper part 19 of the guide 17, and against the foot 20. The inner pulling roll 2 and the outer pulling roll 3 being continuously rotating pull the margin of the covering material M and simultaneously feed the not yet covered part of the molded insole circumference between them. The shape of the pressure disk 9, when locked into its pressure actuated position by the valve means, keeps the molded insole S pressed against the screw wiper 7. The molded insole S is simultaneously urged against the side edge 18 of the guide 17. Feeding of the molded insole S about its periphery is thus fully mechanised during the entire covering operation. The operator, having inserted the molded insole assembly S into the machine, needs only keep the foot lever 16 in its depressed position, thus leaving his hands free for preparation of the next molded insole. After being wiped, (i.e., moved about its periphery) the margin of the covering material M is firmly attached to the upper surface of the core V along the whole circumference of the molded insole and the operator may then allow the foot lever 16 to return to starting position. The valve distributor returns into its original position and the pressure disk 9 is caused to move into the bottom position of its stroke and the completely covered molded insole assembly S is freed and may be removed. This cycle may then be repeated with another preprepared insole assembly.

The valve distributor can also be controlled automatically. For example, a pneumatic sensor may be employed to accomplish this by sensing air flow streaming above the edge of folding covering material when placed between the

rolls

2 and 3 by the operator. At the moment, when this air flow is interrupted by the margin of the covering material, which passes between the inner pulling roll 2 and the outer pulling roll 3, the pneumatic sensor sends a signal to operate the valve distributor, as if it were done by depressing and releasing the foot lever 16, indicated above.

During the covering operation, pressure disk 9 rolls along the molded insole S. Rotary movement of this pressure disk 9 is accomplished by mounting of the labyrinth piston 11 so that its urging against the material causes it to freely rotate. The labyrinth groove system of the piston 11 keeps a preponderant amount of the pressure sealed in the space of the cylinder 12 and prevents it from substantial leakage. Only a small amount of the pressure medium passes through the system of labyrinth grooves and this is drained to waste by way of the opposing

conduits

14 and 15. Suitable seal rings, brass plastic etc., may be used in the grooves of the labyrinth piston head.

The upper part 19 of the guide 17 prewipes the margin of the covering material M immediately behind the engaging points of the inner pulling roll 2 and outer pulling roll 3, thus resulting in improved wiping of the molded insole S.

The foot 20 prevents undesirable deformations of the core V, especially if the core is made of soft material, such as foam rubber.

The embodiment shown in FIG. 5 is particularly adaptable and advantageous when employing covering materials which having a sensitive surface such as coated leathers, laminate plastics, etc., the guide 17 is provided with a hole through which the point 21 of the outer pulling roll 3 passes. Consequently, when covering is taking place, the face side of the covering material M thus rolls along the conical surface of the point 21, at minimum levels of friction and abrasion.

From the foregoing, it will be seen that the advantages and objects of the present invention are simply obtained and an assembly of parts such as those necessary to form the insole can be easily and swiftly joined together with minimum effort and a high degree of rapidity. The advantageous effects of the apparatus according to the invention resides in the fact that the pressure disk which is caused to move by the resilient pressure medium, urges the molded insole against the screw wiper according to the immediate thickness of the molded insole. The labyrinth sealed piston enables free rolling of the pressure disk along the molded insole, which ensures continuous feeding by carrying the lower surface of the assembly. The side backing edge of the guide has an inclination, corresponding to the engaging surface lines of the pulling rolls, which enables the molded insole to be guided accurately at each point of the pressure disk raising movement. The upper part of the guide helps to prewipe the covering material immediately behind the pulling rolls and before the screw wiper. In the embodiment of FIG. 5, the conical surface of the outer pulling roll point forms a rolling backing edge of the molded insole and thus prevents the surface coating of the covering material from becoming damaged.

Various changes, modifications and other manipula tions will be obvious to those skilled in this art. Accordingly, the disclosure is intended to be illustrative only and not limiting of the scope of the invention.

What is claimed is:

1. Apparatus for covering shoe parts, such as molded inner soles, comprising a frame, a screw wiper supported on said frame, a pair of adjacent frusto-conical inner and outer pulling rolls supported on said frame in front of said wiper, said rolls having a mutual line of engagement for the material of said inner sole, presser means mounted beneath said screw wiper, means comprising a piston and pressure cylinder for urging said presser means toward and away from said pulling rollers, said presser means being mounted at the end of a piston rod fixed to said piston, said rod defining the axis of rotation and movement to be rotatable and movable upwardly on an axis parallel to the mutual line of engagement of said pair of pulling rolls to press said inner sole toward said screw wiper.

2. The apparatus according to claim 1 wherein the piston cylinder arrangement includes a labyrinthine piston disposed in the pressure cylinder.

3. The apparatus according to claim 1 wherein the presser means is a disk.

4. The apparatus according to claim 1 including a guide supported on the frame, the backing edge of said guide being parallel to the axis of pressure cylinder and the rod associated therewith.

5. The apparatus according to claim 4 wherein the guide has a triangular upper portion which fills the space between the pulling rolls and the screw wiper.

6. The apparatus according to claim 1 including a plumb point mounted coaxially on the outer pulling roll, to rotate therewith and to form a backing guide.

planar with its bottom edge thereof.

Claims

3. The apparatus according to claim 1 wherein the presser means is a disk.

7. The apparatus according to claim 1 including a foot guide located in front of the inner pulling roll coplanar with its bottom edge thereof.