CZ20003659A3 - Machine for sewing shoe upper to corresponding outsole - Google Patents

Abstract

A shoe sewing machine includes a longitudinal guide (7), which has a bottom surface for receiving in abutment edges (9a, 8a) of an upper (9) and a relative sole (8). The guide steers the edges toward a curved needle (6), that oscillates crosswise to the guide (7), while an idle wheel (17), situated under the longitudinal guide (7), supports the edge (8a) of the sole (8) during stitching. The wheel (17) is carried by the top of a swinging arm (13) which can assume any orientation, so as not to hinder the shoe movement during stitching. The arm (13) is kept in a raised working position (L) and can be lowered, so as to move away the wheel (17) when the upper (9) is set in or removed.

Description

The invention relates to sewing uppers to respective underpants, such as soles or soles, to form shoes.

BACKGROUND OF THE INVENTION

Machines for sewing uppers of shoes and related soles are known, formed from machines for sewing the edges of leather articles adapted to be equipped with suitable tools. An exemplary embodiment of such a machine is described, for example, in U.S. Pat. No. 4,848,252 to the same applicant.

The machine comprises a longitudinal guide defining two flat inclined planes which converge upwardly and define respective work surfaces on which the pieces of leather to be quilted move.

The arm is attached to a shaft located above the end guide, the arm is provided with an arcuate curved needle.

The shaft is driven to pivot about its longitudinal axis so that the needle moves between a raised and lowered position in which it passes the edges of the pieces of leather.

• · · · »

The needle cooperates with a swivel hook, commonly referred to as a "crochet hook", to which the needle of the quilting thread is attached.

This machine allows you to staple the edges of two leather products, such as the upper of the shoe and the toe cap.

However, this machine does not allow the sole to be sewn to the upper with respect to the open type, i.e., it creates a belt to be attached to the sole along its edge.

As previously pointed out, this operating limitation has been overcome by the development of a machine with the corresponding tools derived from the machine of the aforementioned U.S. Pat. No. 4,848,252.

WO 97/05316 also of the same Applicant describes a method and a corresponding machine for sewing a sole to an open type upper.

The machine essentially consists of a head carrying the needle and the operating means of the hook, and a swivel arm.

A longitudinal guide supporting the quilted articles is located at the end of the pivot arm.

The head is suitably inclined with respect to the vertical plane so that the portion of the circular path covered by the needle in the region of the quilting surface has a direction such as to facilitate the entry of the needle into the upper and the exit of the needle from the sole.

The pivoting arm is provided with motorized pedal-operated means to allow it to be placed in suitable positions during stitching of the shoe so that the arm does not interfere with the movement of the shoe.

In addition, the pivot arm comprises a device for maintaining a fixed spatial position of the guide independently of the positions occupied by said arm.

The Applicant has developed another machine which is described in European Patent Application EP 96 941 797.1 and which removes the drawbacks of the above-described machine.

The latter machine maintains the inclined head, in accordance with the method already used in the previous machines, while removing the arm, which is replaced here by a stationary guide attached to said head and running downward.

The lower end of the guide is provided with a flange that supports the inner edge of the sole during quilting.

This latter machine is simpler and, consequently, also in comparison with the above-mentioned first from a commercial point of view far better η o · 7 and tr π o Ί “I Cs 1» V \ v- / ~ \ τ τ z- \ Ι- »R-1 4 TVY z-> rv <-» zx »-> 4 w £ jiixíil uuicíjCííi. / much more compact, even cheaper to produce, and therefore more usable, which results from its design.

In fact, the quilting of the shoe cannot be terminated by completing the closed loop at the starting point. Here, the flange that is placed inside the shoe during quilting is prevented from being removed so that it remains trapped inside and does not allow the shoe to be pulled out of the guide. 1

In order to overcome this drawback, the quilting is interrupted before the last stitch is made so that the shoe can

be removed, by hand. whereupon is subsequently quilting complete operation There is necessary emphasize, that described above operating restrictions must be considered both technical, so i from the commercial aspects, as well in that context that single

the alternative is manual work or much more complex and labor-intensive ways and devices. Therefore, this restriction did not hinder commercial success.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to design and develop a machine which enables the open shoe upper to be sewn to the sole in a complete and definitive manner without subsequent finishing operation and / or interruption of stitching prior to its actual completion.

Another object of the present invention is to propose and develop a machine whose construction and construction with small modifications make it possible to carry out the appropriate quilting such that the upper / - \ γΜγ \ ττί rj τί-i 4 / -> 4 Λ A r <+ - Read:

J. v-UJ J V -ULAU J O O V C.

The above objects have been achieved in accordance with the present invention by designing and developing a machine for sewing the shoe upper to the sole, comprising:

a longitudinal guide formed at the lower free end of the bracket arranged substantially vertically, said longitudinal guide forming an upper stop for the edge of the shoe upper and the edge of the respective sole that are displaced along the same longitudinal guide by a curved needle having an arcuate shape; moving a pivoting movement in a plane crosswise with respect to said longitudinal guide between an initial position adjacent to said longitudinal guide and a maximum rotational position in which the curved needle passes first through said edge of the upper and then the edge of the sole, said curved needle also moving in a linear reciprocating motion parallel to by said longitudinal guide in accordance with strokes of a predetermined pitch, a rotary hook to which a sewing thread spool is associated, the rotary hook being positioned adjacent said longitudinal guide on the opposite side to is the side where the curved needle enters said shoe upper, said swivel hook cooperating with the curved needle to form stitches, a swivel arm arranged rotatable relative to the abutment near and adjacent said longitudinal guide, the wheel being carried free by the curvature rotated arm and positioned below said longitudinal guide, said wheel having an arrangement such that it can rotate about a horizontal axis, crosswise and transverse to said longitudinal guide and coincident with the axis of rotation of said pivot arm, so that the wheel forms a lower stop and a support for the inner surface area of the sole edge.

Preferably, said abutment comprises means for maintaining said arm in a raised working position, wherein said wheel is at a predetermined distance from said longitudinal guide, said means operable to lower said arm to a shoe established in said removal position, wherein the wheel moves away from said longitudinal guide to position it on the upper to be sewn and to remove said upper that has already been sewn to the sole.

Preferably, said longitudinal guide defines two working planes which are substantially vertical and facing each other, with respective edges of said upper and sole extending therethrough.

Preferably, said longitudinal guide is provided with a pair of teeth positioned adjacent said working planes and defining together with said working planes the position of said edges of the upper and the sole.

Preferably, said claws are independently height adjustable to adjust relative position of said upper and sole.

Preferably, said longitudinal guide defines a rounded channel, the concave portion of which is facing downward, to maintain the shape and position of said edge of said shoe upper so as to extend said edge of the sole, the curved needle piercing twice said edge of the shoe upper at points of entry and exit .

Preferably, the wrinkle assembly is positioned adjacent to said longitudinal guide and is provided with a head moving in a reciprocating reciprocating motion in two directions crosswise to said longitudinal guide so as to engage the edge of said shoe upper longitudinally with respect to said guide.

The shoe is preferably located on the same side of the longitudinal guide as the hook, moving crosswise to said guide to stop the sole during needle piercing, said shoe having a through hole through which the needle passes freely.

Preferably, the skin pressing pressure member is positioned adjacent to said guide and moves crosswise transversely with respect to said guide to stop said upper after each stitch has been performed as the needle is withdrawn.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be explained in more detail by way of examples of specific embodiments thereof, the description of which will be given with reference to the accompanying drawings, in which:

Fig. 1 is an axonometric view of a front portion of the machine of the present invention where quilting means are located;

• · · · · · · · · · · · · · · · · · · · · · · ·. * Fig. 2 shows the same axonometric view as in

FIG. 1 showing the position of the machine member; that can the upper is established; or vymut; Fig. 3a shows stitching areas; axonometric view on detail Fig. 3b shows axonometric view on detail

quilting areas from a different angle;

Fig. 4 is a front elevational view of the stitching region, wherein the machine is ready for the first stitching type;

Fig. 5 is an axonometric view of the shoe sewn by the machine of the present invention by the means shown in Fig. 4;

Fig. 6 is the same front view of Fig. 4 of a machine according to the present invention prepared for a second quilting type; and Figure 7 is an axonometric view of a front portion of a shoe sewn by the machine of the present invention using the means shown in Figure 6.

DETAILED DESCRIPTION OF THE INVENTION

In the above figures, the head 3 of the quilting machine carrying the operating means for driving the quilting means is indicated by 3.

Fcfcfcfc fcfcfc fcfc

The quilting machine head 1 is supported in a known manner by means of a base block having a shape such that the quilting machine head 7 is suitably inclined relative to the vertical.

The quilting machine head 7 carries in a known manner a longitudinal shaft 6 provided with a radial arm 5.

The curved needle (5, which has an arcuate shape) is arranged concentrically with respect to the longitudinal shaft 4. This curved needle 6 is attached to the free end of the radial arm 5 (see also U.S. Pat. No. 4,848,252).

The quilting machine head 7 is inclined such that a portion of the circular path covered by the curved needle 6 in the area of the quilting surface has a suitable direction so that the curved needle 6 can appropriately enter and exit at the desired levels.

The curved needle 6 moves cyclically from the starting position adjacent to the longitudinal guide 7 and to the maximum pivotable active position in which the curved needle 6 pierces first the edge 9a of the upper 9 and then the corresponding edge 8a of the sole 8 engaging the longitudinal guide 7.

The upper 9 is particularly open! v \ \ —i 1> - v \ -v- í r · Ί. , X λ á. λ λ X - - - O 1 _ J_ _ _, X pxxpOJOH SE J »J_ _L o JL U OilC [JUU.CČVJ. Of A.I.fi.-LCt in the region of its lower edge 9a.

of the type to be suitably shaped, and

The longitudinal shaft 4 of the curved needle 6 also moves linearly by reciprocating in the axial direction in strokes having a predetermined amplitude and at a suitable time.

4 * ·

»4 443» 4 * «» 3 4 ·

44 · · · 4

4 4 · 4 • 4 44 «in connection with the pivoting movement of the curved needle 6, as will be explained in more detail below.

The curved needle 6 cooperates with a rotary hook 10, commonly known as a "crochet", to which a spool of quilting thread is attached.

The rotary hook 10 is located adjacent the longitudinal guide 6, on the side opposite to the side where the curved shoe needle 59 enters the upper in synchronization with the movement of the longitudinal needle 6.

further, the shafts 4 are displaced curved

As shown and illustrated in the aforementioned WO-A-9705 316, the foot 20, indicated by the dashed line in the figures of FIGS. 4 and 6, is located on the same side as the rotary hook 10.

The shoe 20 moves crosswise with respect to the longitudinal guide T in a suitable time relationship with the pivoting movement of the curved needle 6 for the purpose of holding the sole 6 during needle piercing 6.

The curved needle 6 passes through a slot 21 formed in the bead 20.

n-· · 4 -tl vsv-ττ, Λ 1, CO c 1 ί 1 ,, °, X _Λ ~ -i ~

positioned on the side where the needle 6 enters the shoe upper 9, moves crosswise with respect to the longitudinal guide 6 in a suitable time relationship with the pivoting movement of the curved needle 6 for holding purposes. the upper 6 downwardly after each stitch 9 has been executed as the curved needle 6 is pulled out.

The wrinkle assembly 53 is located on the side where the curved needle 6 enters the shoe upper 9 and is operated on the appropriate command so as to perform a linear reciprocating movement in the longitudinal direction with respect to the longitudinal guide 7 and crosswise with respect to the longitudinal guide 7, ^and in a suitable time relation with the swinging of the curved needle 6th

The wrinkle group 53 carries a head 54 acting on the upper 9 to increase its successive steps relative to the sole 8, thereby wrinkling or wrinkling the edge 9a of the upper 9, for example during quilting of the toe.

The longitudinal guide 11 is formed at the lower free end of the bracket 12, is arranged substantially vertically and is attached to the head 11 of the quilting machine. The bracket 12 as well as the longitudinal guide 7 are intended to guide the edge 9a of the upper 9 and the edges 8a of the sole 13 during quilting.

In accordance with a first embodiment of the present invention, which is shown in more detail in FIG. 4, the longitudinal guide 7 defines two working planes 7a and 7b that are substantially vertical and opposed in opposite directions. The longitudinal guide 7 is provided with a recess, which is formed in a known manner and therefore not shown, and is open towards the head 1 of the quilting machine so that it allows the curved needle 6 to pass through it.

The respective teeth 14 and 15, which are independently adjustable in height, cooperate with the aforementioned working teeth.

I by planes 7a and 7b. AND

In this way, the longitudinal guide 7 forms an upper stop for the edge 9a of the upper 9 and the edge 8a of the sole 13, thereby allowing them to be positioned relative to each other for quilting and to orient these edges 9a and 8a correctly to the point where the curved needle 6 passes.

The longitudinal guide T just described makes it possible to manufacture the footwear shown in FIG. 5.

In accordance with a second embodiment of the present invention, which is shown in more detail in FIG. 6, the longitudinal guide 7 defines a rounded channel 70 whose concave portion is turned downward.

The profile of this rounded channel 70 makes it possible to define the type of shape by which the upper 9 can be sewn to the sole 8 in such a way that the edge 9a of the upper 9 extends beyond the edge 8a of the sole 8 so as to partially wrinkle it.

In this way, the curved needle 6 pierces twice the edge 9a of the upper j) at the points at which it enters and exits.

AND?. ch d Ί clzw ΤΛνόττΑ ν ', /', γ-'η

V— · i- »J V jf V *. _1_ Λ X J>. C in FIG. 8, where it is manufactured in accordance with this method.

sewing is shown part of the shoe,

The second quilting method is particularly effective in producing footwear that has a high watertightness.

• ·

In both embodiments described above, the longitudinal guide 7 cooperates with a wheel 17 located below it and rotating about a horizontal axis crosswise with respect to the longitudinal guide 7.

The wheel 17 is supported freely at the top of the arm 13, which rotates freely with respect to the respective support 130 attached to the head 11 of the quilting machine.

The axis of rotation of the arm 13 coincides with the axis of rotation of the wheel 17 so that the pivoting movement of the arm 13 does not cause a change in the position of the wheel 17.

The support 130 is provided with means 131 for keeping the arm 13 in the raised working position L (see Figs. 1, 4 and 6).

In this situation, the wheel 17 is at a predetermined distance from the longitudinal guide 7, acting as a stop and abutment for the inner surfaces of the edge 8a of the sole 8.

The means 131 are actuated to lower the shoe arm 13, set in the removal position K, in which the wheel 17 is spaced from the longitudinal guide 7 (see FIG. 2).

It is in this position

T \ -K * ί o τ tto ri ørs-ί ηΛ -i —i lx z- \

J- JU * _ »-L. In W.11 f J facing JUJXO to the respective sole 8, it is possible to set up an upper 9 which _τττ τ_ζ _w 4_ ^ 1. η 1-4- 1 Ί _1 _ · vymvUL. OVJ-OCA JILCiy Uy_L J _L Z.

to be sewn after stitching is complete.

The means 131 are a shaft 132 to which they can move in the form of, for example, a vertical articulated arm 13, in a vertical direction and is subjected to the action of resilient means (not shown) that maintain the above-mentioned working position L.

The driving means 133, driven pneumatically, for example, can be actuated by the button 134 so as to act on the vertical shaft 132 so that the arm 13 is lowered to the shoe set in the removal position K, in contrast to the abovementioned elastic means. When the button 134 is released, the actuating means 133 bring the arm 13 back to the raised working position L.

A first operation of the quilting cycle in accordance with both methods is to mount the upper 9 by lowering and raising the arm 13, as mentioned above.

Therefore, the edge 9a of the upper 9 and the edge 8a of the sole j) are located along the longitudinal guide 7 and then are. manually moved to lie opposite each other. They are then sewed together, the sole 8 being supported by a wheel 17 which rolls over the inner surface of its edge 8a.

The machine means drives the needle 6 to pivot in a known manner so that the needle 6 passes first through the edge 9a of the upper 9 and then through the edge 8a of the sole 13 until the needle 6 reaches its maximum rotational position (see Figs. 4 and 6).

in this position of the rotary hook 10, are engaged.

where the quilting threads are a reciprocating movement

At the same time, the curved needle 6 and the rotary gripper 10 move in synchronization along the axis of the respective shafts by a predetermined quilting pitch, as a result of which the upper 9 and the sole 8 are moved. ;

'and

-tli

Then, the curved needle 6 is pulled out of the material to be quilted and brought back to its starting position.

The curved needle 6, together with the gripper 10, moves back at the same pitch as during just the completed stroke in the forward direction.

The foot 20 and the skin pressing force 52 operate as described above during each stitch performed in accordance with the cycle just described.

During quilting, the operator activates a wrinkle group 53 which, by wrinkling the upper 9, compensates for its longer circumferential range with respect to the sole 13 in the toe region, resulting in curvature of the sole.

The operator suitably moves the arm 13 during quilting so that its position does not interfere with the movement of the shoe upper 9.

The stitching is completed along the entire length of the shoe, with the last stitches being made by stitching the initial stitches so that the stitching path C forms a closed loop, and at the same time is suitably fastened (see Figs. 5 and 7).

Then the arm 13 is lowered by depressing the button 134, whereupon the finished shoe is removed.

The work is completed by cutting the quilting threads without any other operations.

It is therefore clear that the tasks mentioned in the introductory part have been fully achieved through a simple, reliable and extremely compact technical solution.

In particular, it should be emphasized that due to the fact that complete and definitive sewing is achieved, labor productivity is increased, without the need for trained operators to manually carry out the quilting process. This compensates for additional costs, albeit only low, resulting from the addition of the arm 13 and the associated means attached thereto.

It is to be understood that the above-described solution is presented herein as a non-limiting exemplary embodiment only, so that any possible design variations are within the scope of protection of the present invention described above and as specified in the following claims.

Wpx> o -

Claims (9)

A machine for sewing uppers of the shoe to the sole, comprising: a longitudinal guide (7) formed at the lower free end of the bracket (12) arranged substantially vertically, said longitudinal guide (7) creating an upper emphasis on the edge (9a) of the shoe upper and on the edge (8a) of the sole. (8), which are displaced along the same longitudinal guide (7), a curved needle (6) having an arcuate shape, wherein the needle moves by a pivoted motion in a plane crosswise with respect to said longitudinal guide (7) between the starting position next to said longitudinal guide (7) and a maximum pivot position in which the curved needle (6) passes first through said edge (9a) of the upper (9) and then the edge (8a) of the sole (8), said curved needle also moving in a linear reciprocating motion parallel to said a longitudinal guide (7) in accordance with strokes of a predetermined pitch, a rotary hook (10) to which a sewing thread spool is associated, the rotary hook (10) being located adjacent said longitudinal guide (7) on the opposite side to the side wherein the curved needle (6) enters said TT 1 CA V a. F cooperates with the curved needle (6) to form stitches, a pivot arm (13) arranged rotatable relative to the abutment (130) near and adjacent said guide (7), the respective longitudinal wheel (14) supported by the free end of said swivel arm (13) and positioned below said longitudinal guide (7), said wheel (17) being configured to rotate about a horizontal axis crosswise and transverse to said longitudinal guide and coincides with by the axis of rotation of said pivot arm (13) so that the wheel (17) forms a lower stop and abutment for the inner surface area of the edge (8a) of the sole (8). Machine according to claim 1, characterized in that said abutment (130) comprises means (131) that keep said arm (13) in the raised working position (L) in which said wheel (17) is at a predetermined distance from said longitudinal guide (7), said means (131) being actuated for lowering said shoe arm (13) set in the removal position (K) in which the wheel (17) moves away from said longitudinal guide (13) 7) to position it on the upper (9) to be sewn and to remove said upper (9) which has already been sewn to the sole (8). A machine characterized in that said longitudinal guide (7) defines two working planes (7a, 7b) that are substantially vertical and facing each other, with respective edges of said upper (9) and sole (8) engaging them. . Machine according to claim 3, characterized in that said longitudinal guide (7) is provided with a pair of cogs (14, 15) disposed adjacent said working planes (7a, 7b) and defining together with said working planes (7a, 7a, 7b), 7b) the position of said edges (9a, 8a) of the upper 9 and the sole (8). Machine according to claim 4, characterized in that said claws (14, 15) are independently height adjustable for adjusting the relative position of said upper (9) and sole (8). The machine of claim 1, wherein said longitudinal guide (7) defines a rounded channel (70) whose concave portion faces downwardly to maintain the shape and position of said edge (9a) of said shoe upper (9), to extend said edge (8a) of the sole, wherein the curved needle (6) pierces twice said edge (9a) of the shoe upper (9) at the points where it enters and exits. Machine according to claim 1, characterized in that the wrinkle group is located next to said longitudinal guide (7) and is provided with a head (54) moving in a linear reciprocating motion in two directions crosswise to said longitudinal guide (7) so that engages with an edge (9a) of said shoe upper (9) longitudinally with respect to said guide (7) to form wrinkles on said edge (9a) of the shoe upper (9). Machine according to claim 1, characterized in that the foot (20) 1, is 1 »* • • • • ♦ » • « « 1 • • • • •  · • • E • • • * • ♦ « and • • ♦ • • ♦ • • • • • * · • • · » • • • · • · 9 located on the same side of the longitudinal guide (7) as the gripper (10), moving crosswise to said guide (7) to stop the sole (8) during needle piercing (6), said foot (20) having a through hole (21) through which said needle (6) passes freely. Machine according to claim 1, characterized in that the skin pressing pressure element (52) is located next to said guide (7) and moves crosswise transversely with respect to said guide (7) to stop said upper (9) after each stitch when pulling out the needle (6) ·