AUTOMATIC STRETCHERS OF SLEEVES OF KNITTED GARMENTS AND THE LIKE FOR IRONING MACHINES

Abstract: The invention relates to automatic stretchers of sleeves of knitted garments and the like, for ironing machines. Said stretchers are composed of chains (1) having links (12), on one side, shaped with traditional grip teeth (13) and, on the other side, with flat surfaces (14) ending in perpendicular side ledges (15). Another feature is constituted by the fact that said chains have their ends pivoted on slides (2), mobile along the external side edges (3) of an extensible elastic frame (4), and on fixed points (6) included inside carters (6) incorporated in the frame (4). In the carters (6) are included the powered cogwheels (8), which engage the chains (1).

Description: The present invention consists of automatic stretchers of sleeves of knitted garments and the like, which are applied at the sleeve juncture, to extensible elastic frames with which ironing machines are equipped for the support and stretching of the central parts of said garments. Each of these stretchers comprises a chain, made up of links having the following configuration ; on one side, they have the traditional teeth which engage a feed cogwheel, and on the other side, they have a flat surface ending in a perpendicular side ledge, which, when coming into contact with the ledges of the adjacent links, obliges the chain to a condition of straight and undeformable rigid alignment, just in one sense, whereas in the opposite sense it may take on the traditional flexible conformations. Each chain has one end pivoted to the external side edges of said elastic frames, whereas the other end is introduced into the same frames, at a tangent to the upper juncture of the shoulders, it engages the feed cogwheel and is extended inside the container carter in which is placed the second end pivot. The extension of the chains outside the frame may be adjusted depending on the type, size and length of the sleeves to be ironed. At present certain devices are known in the literature of the field which are more or less efficacious or rational. These are employed manually or automatically for ironing sleeves of knitted garments and the like on ironing machines. Though these have proved to be undoubtedly efficacious, nonetheless, they do have certain disadvantages. More specifically, it was noted that the devices with a flexible cable may be easily used to stretch short sleeves of knitted garments but when it comes to stretching long sleeves they are not so efficacious due to the excessive flexibility of said cables. The complementary elastic elements have the disadvantage of having to be inserted manually into the sleeves of the garment, entering through the neck opening. This operation, in the case of a lot of garments, may prove awkward due to the very shape of the opening and, in any case, is burdensome, somewhat imprecise and requires a certain waste of time which tends to slow down production rhythms. Lastly, the automatically insertable side devices, though for the most part very efficacious, have the disadvantage of being costly as regards construction. The aim of this invention is to eliminate the drawbacks mentioned previously. The automatic sleeve stretchers of knitted garments and the like according to this invention are composed of chains, the links of which, on one side, present a flat surface ending in a perpendicular side ledge; the ends of said chains being pivoted on slides, mobile along the external, side edges of an extensible elastic frame, and on fixed points comprised inside a carter incorporated in said frame ; in the carter being also included the powered cogwheels which engage the chains. The following advantageous results may be obtained by adopting these technical features. The sleeve stretcher devices form an integral part of and are incorporated in the stretcher frames of the central parts of the garments to be ironed. Their extension may be regulated depending on the type, shape and length of the sleeves to be ironed; the chains, constituting the stretcher devices may take on a flexible configuration just in the sense of their winding, whereas in the opposite direction, they assume a rigid, straight and indeformable conformation which is meant to keep the sleeves perfectly taut during ironing , positioning of the stretcher devices is completely automatic and may be regulated by the control panel of the ironing machine. The automatic stretchers areparticularly advantageous from various viewpoints : they may adapt to, adhere to and stretch sleeves of knitted garments regardless of their shape, type or length. Fitting of the stretchers to the sleeves is automatically performed, simply by turning the rotation command knob of the feed cogwheel, in one direction or the other ; construction of the stretchers is neither costly nor complicated ; use of the above mentioned stretchers permits a considerable time saving; with a consequent increase in the productivity of each ironing machine. The invention is illustrated here below in greater detail, making reference to the enclosed drawing which represents a preferred embodiment model, in which : Figure 1 shows a stretcher applied to one side of an elastic, extensible frame, Figure 2 shows in detail some links of the chain, and Figure 3 shows a partial schematic view of a frame, equipped with automatic sleeve stretchers. The drawings show an automatic sleeve stretcher of knitwear and the like for ironing machines including essentially a chain (1), pivoted, at one end, to a mobile slide (2) along an external side edge (3) of an extensible elastic frame (4), applied to an ironing machine, on which are held and stretched the central parts (20) of the knitted garments. The other end of the chain (1), on the other hand, is pivoted to a fixed point (5) included inside a container carter (6), incorporated in said frame (4). From the outside of the carter (6) the chain (1) passes to the inside of same, and vice versa, through an opening (7) made on the upper angle of the frame (4) more or less at the juncture (21) of the garment sleeve. The passage of the chain (1) through the opening is made more or less at a tangent to the said shoulder juncture. The control of extension and compression of the chain (1) comprises a cogwheel (8) coaxial to a helical wheel (9) driven by a worm screw (10). The worm screw (10), in turn, is controlled automatically through a flexible cable (11) connected to a motor (not illustrated). The cogwheel (8) engages the teeth (13) of the chain (1) in its part immediately inside the frame (4) and the container carter (6). The slide (2) may be moved at will along the outside border (3) of the frame (4) in such a way as to be positioned in the exact position desired depending on the size of the armholes (22) of the garments to be ironed. At the start of the operation, the two chains (1) constituting the frame stretcher devices (4) are more or less withdrawn inside their frames (4) so as to facilitate insertion over them of the central part (20) of the garment to be ironed. Once the stretching operations of same central part have been completed, the control motors of the flexible cables (11) are set into motion and consequently, the worm screw/helical wheel couple (10 and 9) and the cogwheels (8). During motion the cogwheels (8) feed the chains (1) which are extended outside the frame (4). However, since the central part (20) of a garment to be ironed is stretched over said frame (4), the chains (1) have to be inserted into the sleeves (22) of same, in as much as the corresponding armholes are placed between the junctures (21) of the shoulders, i.e. near the openings (7) through which the chains (1) are extended and the position of the slides (2) on which are pivoted the first ends of the chains themselves. The chains (1) are let out slowly until they engage the upper and lower edges of the sleeves (22). The operation of engaging and keeping the sleeves sufficiently taut to permit their ironing is made possible thanks to the special conformation of the links (12) of the chains (1). Said links (12) are shaped in such a way as to permit bending of the chains just on one side whereas, on the other, they are compelled to keep a rigid, straight and undeformable conformation. This is possible in as much as the links (12) are shaped in such a way that the grip teeth (13) which couple with the cogwheel (8) are present only on their inner sides, whereas the outer sides are composed mainly of a flat surface (14) ending in a perpendicular side ledge (15) which, in conditions of the chain's extension (1), enter into contact with and adhere to the ledges (15) of the adjacent links (12). When said ledges (15) enter into contact between each other, the chains (1) have to take on, in that direction, a rigid, straight and undeformable conformation. Due to the fact that the above mentioned sides with flat surfaces (14) are directed towards the outside of the chains (1), the rigid, flat and undeformable conformations take up their position in correspondence with the upper and lower edges of the sleeves (22). On the other hand, the flexible conformation that the chains (1) may assume towards their inner part, in which the links (12) are provided with teeth (13), permits perfect adjustability of their extension and re-winding, in the meantime guaranteeing the end curve configuration (16) which constitutes the limit of the two rigid arms (17 and 18) which are then engaged with the sleeve edges (22). Once the ironing operation is over, the chains (1) are withdrawn inside the corresponding carters (6), freeing the sleeves (22) thus facilitating removal of the central part (20) from the frame (4).

Claims: Automatic stretchers of sleeves of knitted garments and the like for ironing machines, characterized by the fact that they are comprised of chains (1) having links (12) shaped, on one side, with traditional grip teeth (13) and, on the other side, having flat surfaces (14) ending in perpendicular ledges (15) so as to permit bending of the chains just on one side, whereas, on the others, they are compelled to keep a rigid, straight and undeformable conformation; said chains (1) having ends pivoted on slides (2), mobile along the side external edges (3) of an extensible elastic frame (4), and on fixed points (6) included within carters (6) incorporated inside said frame (4); being also included inside the carters (6) powered cogwheels (8),which engage the chains (1). Automatic stretchers according to claim 1, characterized by the fact that the frames (4) are equipped with openings (7) through which are extended, at a tangent to the juncture points (21) of the shoulders, said chains (1). Automatic stretchers according to any preceding claim, characterized by the fact that the adjustment of the position of the slides (2), on which are pivoted the ends of the chains (1), depends on the type, width and shape of the sleeves (22) of the garments to be ironed. Automatic stretchers according to claims 1 to 3, characterized by the fact that the links (12) of the chains (1) are directed in such a way that the grip teeth (13) face towards the inside of the sleeves (22), whereas the flat surfaces (14) face the outside and towards the edges of the sleeves themselves. Automatic stretchers according to claims 1 to 4, characterized by the fact that, in extension, the side ledges (15), perpendicular to the upper surfaces (14) of the links (12) enter into contact with and adhere to the side ledges of the adjacent links (12). Automatic stretchers according to claims 1 to 5, characterized by the fact that the feed cogwheels (8) used for extension and/or compression of the chains (1) are controlled by helical gear/worm screw groups (9) + (10); the latter being connected by means of flexible cables (11) and electric motors.

Inventors: GRASSELLI, PAOLA, MONTICELLI, IVAN
Applicants: O.MA.TEX. RIMACH S.P.A.
Application year: 1987
Main classification: D06F59
IPC codes: D06F59, A41H31, D06F81, D06F73, D06B5