Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B21/00—Sewing machines with devices for automatically controlling movement of work-carrier relative to stitch-forming mechanism in order to obtain particular configuration of seam, e.g. programme-controlled for sewing collars, for attaching pockets

Definitions

• the invention relates to a feed device for sewing machines according to the preamble of claim 1 for a quick and controllable displacement of a workpiece carrier.
• a solution is known from JP-AS 63-9477 in which a slide is arranged in the intersection area of two guide rods located in planes lying one above the other in parallel, one of the guide rods running in the X direction and the other in the Y direction, and the Rods are guided at their ends and driven by stepper motors via toothed belts perpendicular to their longitudinal extension.
• the slide is penetrated and carried by the guide rods and brought into a desired X-Y position by a movement of the guide rod in the X and / or Y direction.
• the slide is penetrated and carried by the guide rods and brought into a desired X-Y position by a movement of the guide rod in the X and / or Y direction.
• due to the floating arrangement of the carriage there is a risk of vibration, which ultimately impairs the accuracy of the positioning of a workpiece carrier connected to the carriage during a sewing process.
• the invention has for its object to provide a low-inertia and largely vibration-free feed device for fast and controllable movement of a workpiece carrier for sewing machines.
• the object is achieved according to the invention by a carriage arrangement according to the characterizing part of claim 1, which is advantageously embodied by the following subclaims.
• the two guide elements arranged perpendicular to each other have sliding elements for the guides at their ends and are preferably formed from two carbon fiber bands arranged directly or at a distance one above the other, which are connected to steel strips arranged on their lateral edge regions.
• the slide Due to the fact that the slide rests on a surface parallel to the plane of the guides and is arranged on it in a sliding manner, vibration during displacement is almost excluded.
• An essential part of the feed device are the guide elements which, due to their low bending strength in a plane running perpendicular to their plane of movement, in particular perpendicular to the plane of movement, allow the slide to rest on the base.
• the sliding conditions for the slide are optimal when it lies with its weight, which is evenly distributed over its entire base area, on the surface parallel to the plane of the guides.
• Plane of movement prevents canting on the slide caused by the sewing material processing and thus also allows the slide to slide without tilting and defined changes in position.
• the best prerequisites for a vibration-free displacement of the slide are given with a horizontal plane of movement and a high bending strength of the guide elements in the horizontal direction and a low bending strength of the guide elements in the vertical direction. It is also advantageous to resiliently support the slide on its upper side in order to improve the vibration-free friction sliding. In this sense, the measure of providing the sliding surfaces of the slide and the sliding elements with a Teflon coating is supportive.
• rollers are provided on the slide, which support and guide the slide
• the arrangement has the particular advantage of a low overall height and a low mass.
• Fig. 1 is a schematic representation of the invention
• Fig. 2 is a schematic representation of the carriage
• Fig. 5 is a guide belt in section
• a sliding element 7 is firmly connected to the lower run of a toothed belt and to one end of a guide belt.
• the toothed belt pairs 8, 8 1 and 9, 9 ' are driven separately from one another by the stationary stepper motors 10, 11.
• the stepper motor 10 drives the toothed belts 8 and 8' synchronously via the drive shaft 12 and the stepper motor 11 synchronously the toothed belts 9 and 9 ' via the drive shaft 13, whereby the guide belts 4 and 5 are each moved perpendicular to their longitudinal extent and the slide 3 experiences a corresponding change in position in the X and / or Y direction.
• the rails 6, the stepper motors 10, 11 and the deflection rollers 14 are attached to the frame 2, which is arranged freely floating on the work side above the flat table surface, so that a workpiece carrier 33 connected to the slide has sufficient freedom of movement with the workpiece.
• Fig. 4 shows a sliding element 7 located on a slide 6, to which one end of the guide band 5 is fastened with the screws 15 and the toothed belt 8 'by means of the cover plate 16 with the screws 17.
• the sliding element 7 is provided on its underside with a Teflon coating 18. The sliding element 7 is guided laterally by the rollers 19.
• the arrangement of the rollers can be seen from FIGS. 2 and 3.
• the horizontal support of the guide belt 4 takes place according to FIG. 3 by the rollers 20, which are mounted vertically in the false ceiling 21 of the carriage 3.
• pairs of horizontally mounted rollers 23 and 23 ', between which the guide belts are passed horizontally, are arranged on bends 24 or attached angle pieces 25 on the entry and exit sides of the belts on the carriage, as shown in FIG.
• the base of the carriage 3 is provided with a Teflon layer 26 in order to improve its slidability on the flat table surface 1.
• the carriage is resiliently supported on its upper side in relation to a cover (not shown) which closes the feed device upwards.
• a cover (not shown) which closes the feed device upwards.
• a bushing 27 on the top of the cover plate of the slide in the center thereof is a bushing 27 with an internal compression spring 28 and a cap 29 arranged thereon, which is loaded by the cover, not shown, and transmits this pressure load via the spring to the slide.
• FIG. 5 the section through a guide band 4 or 5 is shown, which due to its structure has a high bending strength in the horizontal direction and a low bending strength in the vertical direction owns.
• a PU show layer 31 and steel strips 32 arranged on the longitudinal side are located between two carbon fiber bands 30.
• Stepper motors can be switched on in succession or simultaneously via a control circuit.
• Switching on the stepping motor 10, for example, leads via the toothed belts 8 and 8 'to a movement of the guide belts 5 along the X direction, as a result of which the slide 3 resting on the flat table surface 1 with its Teflon-coated base surface 26 and the workpiece holder 33 likewise along the X- Direction.
• the carriage rolls with its rollers 20 and 23 along the guide belt 4.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6384012

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (1)

Citations (6)

• 1989
  • 1989-06-30 DE DE19893921519 patent/DE3921519A1/de active Granted
• 1990
  • 1990-06-27 JP JP2510271A patent/JPH05501070A/ja active Pending
  • 1990-06-27 EP EP19900910632 patent/EP0479872A1/de not_active Withdrawn
  • 1990-06-27 WO PCT/EP1990/001029 patent/WO1991000383A1/de not_active Application Discontinuation

Patent Citations (6)

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