Abstract: The described sewing machine has a work supporting bed (5) divided into two portions (6, 7) separated from each other by a central slot (8). The parts (2, 3) of a workpiece (M) to be assembled are laid down each on one portion (2, 3) of the work supporting bed (5) and are moved close to each other so that the respective junction edges (G) may mutually match after being vertically folded downwardly within the slot (8). The junction edges (G) thus oriented engage between a needle plate (9) and a presser foot (25) disposed according to vertical planes, for being submitted to the action of feeding and sewing means operating under the work supporting bed.

Abstract: In the described method, for keying-in of a given operating cycle a plurality of bar codes is provided to be sequentially inputted to an electronic control unit (114) with the aid of an optical detector (126) , each bar code corresponding to a specific operation to be executed on a workpiece (116) for carrying out a particular working. The bar codes (125) are reproduced on respective adhesive labels (127) applied to a work card (115) carrying the workpiece depiction, each code (125) being disposed close to a corresponding area of the workpiece (116) on which the corresponding working is to be made.

Abstract: A top feed unit comprises a vertical-movement kinematic mechanism (19) and a horizontal-movement kinematic mechanism (20) acting on a rocking arm (18) supporting a top feed dog (17) and operated by respective eccentrics (21, 29) fitted to an auxiliary shaft (37). The vertical- and horizontal-movement kinematic mechanisms (29, 20) and the auxiliary shaft (37) are contained in a housing structure (34) which can be detachably engaged to the sewing machine head (7). The auxiliary shaft (37) is connected to an interconnecting stem (41) rotatably connected to the sewing machine arm (6) and driven in rotation, through a toothed belt (46), by the upper drive shaft (8) of the sewing machine (2).

Abstract: A presser foot having a shoe comprising a pair of mutually facing front portions (5a, 5b) and a pair of rear portions (6a, 6b) in alignment with the front portions (5a, 5b) and connected thereto by a pair of side rocker arms (7a, 7b). The side rocker arms (7a, 7b) are pivotably supported by swinging arms (10a, 10b) linked to a small bearing frame (2). A center rocking arm (15) mounted on the bearing frame (2) acts by a pair of laterally disposed pistons (17a, 17b) on the individual swinging arms (10a, 10b) in order to mutually balance the fulcra of the side rocker arms (7a, 7b). Operating at a longitudinal opening (29) defined between the front portions (5a, 5b) is a fixed knife (32) and a movable knife (33) which are adjustable independently of each other in their vertical positioning relative to the shoe (4).

Abstract: A sewing machine having two bordering guides (11, 16) that are used to apply two different ribbon-like trimmings to a workpiece. The first bordering guide (11) is mounted on a machine bed (2) and oscillatable about a vertical axis spaced apart sideways from the working position located in front of a machine presser foot. The second bordering guide (16) is mounted on the machine bed (2) and oscillatable about a horizontal axis arranged at right angles to a workpiece advancing direction and below the working position. Each of the first and second bordering guides is moved from a rest position to a working position located before the presser foot so that they reach the working position alternately with the other while the stitching operation is being carried out.

Abstract: The driving mechanism comprises a driving arm (10) fastened to a drive shaft (9) operated with an oscillatory movement about its own axis. Pivoted to the free end of the driving arm (10) is a support arm (11) carrying an upper looper (4). The support arm is also fastened to an auxiliary arm (12) pivotally mounted to a bearing pin (13). The bearing pin is eccentrically fixed to an auxiliary pivot pin (15) housed in the machine bed (2), with possibility of rotation about an axis which is offset relative to the axis of the support pin. The auxiliary pin (15) can be selectively oriented about its own axis according to different angular positions for the purpose of modifying the position of the axis of the bearing pin (13) and, as a result, the path taken by the upper looper (4).

Abstract: A sewing machine comprises a bed 3 on which a work-supporting table 3a is defined and from which a post 4 carrying a cantilevered support arm 5 provided with a needle-holding head 6 at its free end, rises up. An upper shaft 9 performing a rotating motion is housed within the arm 5 and it imparts a reciprocating movement, through a connecting rod-crank linkage 10, to a needle bar 11 vertically slidable in the head 6. Along the upper shaft 9 a plurality of eccentrics 19, 20, 21 are distributed to which auxiliary sewing operation devices 22, 32, 39 detachably associated with the sewing machine 1 are operativley engageable through respective connecting rods 23, 33, 50 and transferring motion mechanisms. A preformed opening 5 is formed in the support arm 5, through which connecting rod 50 is mounted to eccentric 21. An opening 36 is formed in support arm 5 through which stem 37 passes.