Sewing – Special machines – Embroidering
Patent
1998-03-30
1999-09-21
Izaguirre, Ismael
Sewing
Special machines
Embroidering
D05C 1510
Patent
active
059540036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a bar with modules for tufting tools, in particular a needle bar with needle modules, in which the tufting tools are cast at one end into a plate-shaped module basic body, the length of which corresponds to a multiple of the centre-to-centre distance of the cast-in tufting tools and which has a plane face, bearing against the bar, and at least one continuous bore, through which a fastening screw can engage and be screwed into the bar.
2. Description of the Prior Art
It is known to cast a row of tufting, knitting or Raschel tools, for example needles or grippers, into a module basic body at exact locations and subsequently to fasten the modules, consisting of the tools and of the module basic body, to a bar, for example the needle bar of a tufting machine. For fixing to the bar, the module basic body is provided with a bore, through which a screw is led. A corresponding threaded hole is provided in the bar. In addition, there may be formed onto the module basic body a rectangular stop strip which is intended to fix the module in the direction of the bar and which transmits the force acting in the direction of the tools from the module to the bar.
Particularly in the case of longer tools and when working with racked stitches, the considerable yarn forces on the tools give rise to a torque which acts on the modules and which may be so great that rotation of the module occurs. Rotation, although being limited when a stop strip is present, is not prevented, since the stop strip, on account of its tolerances, allows the module to rotate, albeit only slightly.
Even this rotation is undesirable, since it leads to an uneven structure of the material produced by means of the tools, for example a tufting fabric. If the torque forces act in both directions, there is even a loosening of the module.
SUMMARY OF THE INVENTION
The object on which the invention is based is to design the modules or bars in such a way that rotation or loosening of a module is ruled out.
The object is achieved, according to the invention, in that at least one groove running horizontally is worked in the bar, and in that there extends from the plane face of each module at least one moulding which projects perpendicularly to this face and which engages into the groove of the bar and, alone or jointly with further mouldings, holds the respective module fixedly in terms of rotation in the bar.
In a way according to the invention, the arrangement may be designed in such a way that the moulding and the groove are rectangular in cross-section.
In a way according to the invention, the arrangement may also be designed in such a way that the moulding or mouldings has or have the form of a feather key and the groove or grooves has or have the form of a feather key groove.
In a way according to the invention, the arrangement may also be designed in such a way that the moulding and the groove are triangular in cross-section and, in addition, a further groove opening the front edge of the moulding is made on the groove bottom.
In a way according to the invention, the arrangement may also be designed in such a way that the moulding is trapezoidal in cross-section and the groove is triangular in cross-section.
In a way according to the invention, the arrangement may also be designed in such a way that the moulding or mouldings is or are formed on both sides of the module.
In a way according to the invention, the arrangement may also be designed in such a way that a collar annularly surrounding the bore is formed on the module on the side on which the said module comes to bear on the bar, the said collar engaging in a suitable recess coaxially surrounding a threaded blind hole of the bar.
In a way according to the invention, the arrangement may also be designed in such a way that the fastening screw has, in the region of the bore of the module, a threadless shank part, the diameter of which is larger than the diameter of the threaded part of the fastening screw.
In a way accordi
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Beyer Walter
White Derek
Izaguirre Ismael
Purdue David C.
Purdue John C.
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