Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B35/00—Work-feeding or -handling elements not otherwise provided for
  • D05B35/02—Work-feeding or -handling elements not otherwise provided for for facilitating seaming; Hem-turning elements; Hemmers

Definitions

• the invention relates to a device according to the preamble of patent claim 1.
• a device of this type is known from DE-PS 25 44 409.
• the folding rail of this device is designed as a flat rail of U-shaped cross section and is fastened at the end remote from the machine to a bracket fixed to the frame in such a way that it extends cantilevered to a sewing machine close to the stitch formation point.
• the web part connecting the legs of the folding rail defines the fold line for the first cover edge on the fabric blank.
• a pneumatically vertically operable folding sword is provided.
• a folding slide L-shaped cross section movable horizontally under the lower leg of the U-shaped folding rail is provided perpendicular to the longitudinal edge of the folding rail formed by the web part.
• the horizontal leg of this folding slide has a longitudinal groove running parallel to the sewing direction, in which the upper run of an endless conveyor belt is guided for entrainment during the transverse displacement of the folding slide.
• the remaining edge strip is first lifted by the second folding slide, which is horizontally movable vertically and perpendicularly to the long edge of the folding rail, and then horizontally between the Leg of the U-shaped folding rail inserted.
• the Umle ⁇ rolls around which it is guided are arranged so as to be axially displaceable on shafts which are partially designed as a square.
• an upper, synchronous to the lower driven endless conveyor belt works together in order to move the fabric blank by deducting the double envelope from the folding rail through the stitch formation point of the sewing machine. Since the folding sword and the second folding slide remain in their position which they occupy at the end of the folding process, because an uncontrolled displacement of the envelope folds would occur when pulling back, a higher static friction has to be overcome when pulling off the cover part than from the folding rail alone. Due to the braking, a longitudinal distortion occurs on the fabric blank or on the cover part, with the result that the double-folded part of the edge strip after passing through the folding device does not end flush with the trailing edge of the fabric blank, but protrudes beyond it and thus the good appearance of Workpiece affected. To avoid this disadvantage, an additional, momentarily acting auxiliary slider is used for the trailing end of the cover part of the fabric blank in this device
• the folding rail around which the edge strip of a workpiece is folded around on such a folding system, may only be attached to one end, which is remote from the sewing machine, in order to be able to pull the cover part off the folding rail.
• this should also be as thin as possible to achieve flat envelopes.
• the flexural strength for certain dimensions places very narrow limits on the length of a folding rail and thus the size of the workpieces to be machined, if the folding slide should work perpendicularly to the edge edge of the workpiece because of the advantageous folding of the edge strip on the end edges of the cover part to avoid protrusions.
• the envelope width must also be taken into account, which also has an influence on the length that can be processed.
• the invention has for its object to design a device according to the preamble of claim 1 so that relatively wide flat envelopes can be formed on fabric cuts of great length and a relative displacement of the folded envelope part and the longitudinal distortion of the envelope part is avoided when pulling off the folding rail. This object is achieved by the measures specified in the characterizing part of patent claim 1.
• the folding slide can thereby be a thin sheet of great length, for example for forming the
• This thin folding rail can be grasped in the region of the free end and, together with the carrier to which its other end is fastened, can be raised for unimpeded insertion of a workpiece and then lowered onto the workpiece. To carry out the folding operation, the edge area is clamped so that a displacement of the workpiece during the subsequent work of the folding slides is avoided with certainty.
• the transport pressure belts which can be adjusted independently of each other, allow the folded cover part to be pressed against the support surface first on one side and the first folding slide to be pulled back from the cover part to the starting position and then pressed against the cover part on the other side to relieve the pressure on the first conveyor belt in order to pull the second folding slide back into its starting position so that the folding slides are outside the cover part during the removal of the cover part from the fold rail when the workpiece is being transported through the stitch formation point of the sewing machine and exert no braking effect on the cover part.
• Claim 2 specifies a particularly simple solution for clamping the sewing material.
• the folding slide simultaneously form part of the bearing surface for the workpiece.
• the measure according to claim 4 serves in addition to
• the position of the seam on the cover part is changeable relative to the side edge.
• the outer bar can be chosen wider than the inner bar behind it, so that it is covered.
• Fig. 1 is a diagrammatic representation of a
• Sewing unit with a device for forming a double envelope
• FIG. 2 shows a diagrammatic representation of the individual time “A” from FIG. 1,
• Fig. 4 shows a section along the line IV - IV of FIG. 1 with an inserted workpiece before the folding process begins
• Fig. 9 shows a section through the cover part of the workpiece, turned into a double bar
• Fig. 10 is a partial view of a finished workpiece.
• two lower, wide conveyor belts (2, 3) which are guided around deflection rollers (not shown) and at a distance from one another
• two further narrow lower conveyor belts (4, 5) are arranged at a distance from one another.
• the conveyor belts (4, 5) are guided at one end around deflection rollers (6, 7) and at the other end around further deflection rollers (not shown).
• Two narrow upper conveyor pressure belts (8, 9) work together with the lower conveyor belts (4, 5).
• the transport pressure belts (8, 9) are each around a deflection roller (12) mounted on a bearing axis (10) on a spar (11) of the frame (1), each with a tensioning roller (13) under spring action, one each on a mounting rail ( 14 or 15) mounted deflection roller (16) (only one visible in FIG. 1) and one deflection pin (17) in each of FIGS. 1 and 2, one of which is mounted in a two-part, two-part design, mounted on the support rail (14) Lever (18) and the other in a mounted on the mounting rail (15), two-piece two-arm lever (19) is attached.
• the upper transport pressure belts (8, 9) each pass a deflection roller (21) mounted on a bridge (20) fixed to the frame past the stitch formation point of a sewing machine SM, and each deflection roller (23) which can be rotated about a bearing axis (22) fixed to the frame upwards one deflection roller (25), which can be rotated about a bearing axis (24), a deflection roller (27), which can be rotated about a bearing axis (26), one drive roller (29) attached to the output shaft (28) of a drive device (not shown) by one a pneumatic chain (30) actuable thread chain separating knife (31) downwards, around a deflection roller (33) which can be rotated about a bearing axis (32), and a deflection roller (35) which can be rotated about a bearing axis (34) at an angle upwards and around One deflection roller (37), which can be rotated about a bearing axis (36) fixed to the frame, is guided to the deflection rollers (12
• a plurality of swivel levers (38) are mounted on the mounting rails (14, 15), on each of which a pressure roller (39) is rotatably arranged.
• the pressure rollers (39) serve to press the lower run of the transport pressure belts (8, 9) and thus the material to be sewn onto the lower conveyor belts (4, 5) under the action of the tension springs (40) acting on the swivel levers (38).
• the mounting rails (14, 15) can be moved in height independently of one another.
• Two blocks (42), which are arranged at a distance from one another, are screwed to the mounting rail (14) for fastening a vertical sliding rod (41).
• Each Gleitsta ⁇ ge (41) is slidably received in a guide (43) which on the spar (11) attached tabs (44) is worn.
• the piston rod (45) of a double-acting pneumatic cylinder (46) attached to the brackets (44) acts on each block (42) to adjust the height of the mounting rail (14).
• the lever (18) consists of a section (53) with a lever arm (54) which is attached to the mounting rail (40) by one Bolt (55) is pivotally mounted and in which a guide rod (57) fastened in the second section (56) can be displaced.
• the second section (56) is firmly connected to the piston rod (not visible in FIG. 2) of a double-acting pneumatic cylinder (58) attached to the section (53).
• Support rail (14) is attached to the holding plate (62).
• the lever (19) consists of a section (63) with a lever arm (64) around one the mounting rail (15) fastened bolt (65) is pivotally mounted and in which a guide rod (67) fastened in the second section (66) is displaceable.
• the second section (66) is firmly connected to the piston rod (68) of a double-acting pneumatic cylinder (69) attached to the section (63).
• the fork arm (71) of a double-acting pneumatic cylinder (72), which is attached to the piston rod (70), engages on the lever arm (65) of the section (63), the housing of which is articulated at one end to a holding plate (73) fastened on the mounting rail (15) is.
• the levers (18, 19) can be pivoted about the horizontal bolts (55) and (65) and the sections (56 and 66) with the deflection pins (17) can be moved towards and away from one another in a horizontal plane.
• the end of the folding sheath (76) remote from the sewing machine is fastened to the underside of an angle (77) which, with the help of a through a longitudinal slot (78) in one
• the slider (79) is arranged such that it can be moved vertically on guide rods (81) which are fastened to a tab (82) fastened to the straw (11).
• a double-acting pneumatic cylinder (83) is provided on the bracket (82) for driving the slide (79), the piston rod (84) engaging the slide (79).
• An electromagnet (85), FIG. 3, is used to grip and hold the free end of the folding rail (76) near the sewing machine, which is arranged on the piston rod (86) of a double-acting pneumatic cylinder (88), which is attached to a bracket (11) screwed onto the spar (11). 87) is attached.
• the envelope fold is formed by two folding slides (89, 90) made of thin sheet metal in cooperation with the folding rail (76).
• the folding slide (89) is screwed onto a support bar (91), to which two vertical guide rods (92) are attached (only one visible in FIGS. 4 to 7), which slide in guide blocks (93), which are attached to an angled rail (94 ), Figure 4, are attached.
• Attached to the underside of the angle rail (94) are two guide blocks (95) arranged at a distance from one another (one shown in FIG. 4), by means of which, for the transverse displacement of the angle rail (94) with the parts arranged thereon, by means of at least one double-acting pneumatic cylinder (96) one horizontal guide rod (97) fixed to the frame is carried out.
• the piston rod (98) of the pneumatic cylinder (96) is connected to the angle rail (94) and the cylinder housing to the spar (74).
• a single-acting pneumatic cylinder (99) serves to shift the height of the folding slide (89), the piston rod (100) of which is connected to the support bar (91) and the housing of which is connected to the angle rail (94).
• the folding slide (90) is screwed onto a support bar (101), to which two guide rods (102) arranged at a distance from one another are fastened (only one visible in FIGS. 4 to 7), which slide in guide blocks (103), which on a frame-fixed angle rail (104), Figure 4, are attached.
• the piston rod (107) of the pneumatic cylinder (106) is connected to the angle rail (104) and the cylinder housing to the spar (74).
• a single-acting pneumatic cylinder (108) is provided to shift the height of the folding slide (90), the piston rod (109) of which is connected to the support bar (101) and the housing of which is connected to the angle rail (104).
• a nozzle tube (110) with a row of blowing nozzles (111) directed against the folding rail (76) is attached to its edge facing away from the folding rail (76). How it works:
• a workpiece (W) according to markings (M), Fig. 1, is placed on the sewing unit with the edge area to be folded onto the folding slides (89, 90) and the switched-off electromagnetic bar (75) so that the remaining workpiece length is placed over the nozzle tube ( 110) to which the blown air supply is interrupted.
• the folding rail (76) is then lowered onto the workpiece (W) by the pneumatic cylinders (83 and 88), the sliding piece (79) sliding downward on the guide rods (81).
• the electromagnet (85) for the free end of the folding rail (76) is switched off and raised by the pneumatic cylinder (88). Since the
• Folding rail (76) only rests on the workpiece (W) due to its own weight, it is possible to correct the position of the workpiece (W).
• the electromagnetic bar (75) is switched on, so that the under the folding rail (76) horizontal parts (112) of the workpiece (W) are clamped by the folding rail (76) attracted by the electromagnetic strip (75) for the subsequent folding process. A work piece shift during the folding process is avoided.
• the edge (113) of the workpiece (W) lying to the left of the folding rail (76) in relation to FIG. 4 is raised beyond the folding rail (76) by the folding slide (89) actuated by the pneumatic cylinder (99), the edge on the support bar (91) attached guide rods (92) slide upwards in the guide blocks (93).
• the folding slide (90) is then moved upwards by the piston rod (109) of the pneumatic cylinder (108) connected to its support strip (101), with the workpiece (W) via the folding rail (76), the folded edge (113) and the Folding slide (89) is raised and by the pneumatic cylinder (106), the piston rod (107) of which acts on the angle rail (104) serving as a support for the folding slide (90), the guide rods (102) via the guide blocks (103) and the support bar (101) with the angle rail (104) connected folding slide (90) the horizontal guide rods (97) are moved transversely to the sewing direction, arrow (V), FIG. 1, the workpiece (W) being folded into the position shown in FIG.
• Piston rods (45) are attached to the blocks (42) screwed to the mounting rail (14) and lowered onto the cover part (114).
• the section (56) of the lever (18) with the deflection pin (17) (see in particular Fig. 2) is displaced by the pneumatic cylinder (58) so that the deflection pin (17) is pulled away under the transport pressure belt (8).
• the lever (18) is pivoted upward about the bolt (55) by the pneumatic cylinder (61).
• the folding slide (90) is then withdrawn by the pneumatic cylinder (106) from the folding end position and brought downwards into its starting position by the pneumatic cylinder (108).
• the transport pressure belt (8) is briefly relieved of pressure, and the folding slide (89) is pulled back from the end position of folding by the pneumatic cylinder (96) and brought downwards to its starting position by the pneumatic cylinder (99).
• the pneumatic cylinders (46) are again pressurized with compressed air.
• the electromagnetic bar (75) is then switched off and the sewing system is switched on with the sewing machine (SM).
• the workpiece (W) which rests on the conveyor belts (2, 3) and is pinched like a forceps on the cover part (114) by the conveyor pressure belts (8, 9) and the lower conveyor belts (4, 5), is used to form the seam (115) by the stitch formation point transported by the sewing machine (SM), the cover part (114) being pulled off the folding rail (76).
• the thread chain is separated by the chain separating knife (31) and the sewing unit is switched off.
• the sewn-over cover part (114) is folded and ironed into a buttonhole strip (116) and a cover strip (117).
• the position of the seam (115) can be changed by transverse movement of the folding rail (76) after loosening the screw (80), for example to sew the buttonhole bar (116) on the inside narrower than the outer cover bar (117).

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6355719

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (2)

• 1988
  • 1988-06-03 DE DE19883818814 patent/DE3818814C1/de not_active Expired
• 1989
  • 1989-04-28 JP JP50543489A patent/JPH03504680A/ja active Pending
  • 1989-04-28 WO PCT/EP1989/000469 patent/WO1989012128A1/de not_active Application Discontinuation
  • 1989-04-28 EP EP19890905658 patent/EP0417134A1/de not_active Ceased

Patent Citations (2)

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