Sewing – Special machines – Embroidering
Patent
1999-05-07
2000-09-12
Nerbun, Peter
Sewing
Special machines
Embroidering
112 806, D05C 1104, D05C 1510
Patent
active
06116173&
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a module and bar for tufting tools, in particular a needle module and needle bar, 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 center distance of the cast-in tufting tools and which has a plane face, bearing on a plane bearing face of the bar, and at least one perforation, through which a fastening screw can engage and be screwed into the bar.
It is known to cast a row of tufting, knitting or Raschel tools, for example needles or grippers, into a module basic body at an exact location and subsequently to fasten the modules, consisting of the tools and 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 perforation, for example in the form of a bore, through which a screw is led. A corresponding threaded hole is provided in the bar.
DE-A-42 23 642 discloses a bar with module, in which the module additionally has a stop strip and a vertically running guide strip which engages into a matching groove in the needle bar. The guide strip is intended to align and center the module. The fastening bore extends through the guide strip.
Owing to the tolerances of the modules and bar and their bores, the stop strip does not always butt exactly on the bar, so that, under high forces, the module may be slightly displaced vertically.
German Utility Model 295 06 820, then, has already disclosed a bar with modules for tufting tools, in which a longitudinal groove is worked into the bar and each module engages with a projecting moulding into this groove, so that the module is held fixedly in terms of rotation. In addition, the module is to be retained in the vertical and horizontal directions by means of a locating screw or a collar which surrounds the bore of the module annularly and which engages into the bar.
Although, in the installed state, this module is thus seated relatively fixedly in terms of rotation, it has to be secured by means of a special locating screw in order to be installed exactly in position in the longitudinal direction of the bar. If a locating screw of this kind is not used, the module may be displaced, if only slightly, in the longitudinal direction of the bar due to the considerable yarn forces on the tools. The displacement results in an uneven stricture of the fabric produced by means of the tools.
The object on which the invention is based is, by simple means, to design the modules or the bar in such a way that a module is secured reliably in all directions.
The object is achieved, according to the invention, in that the module is secured positively on the bar in the vertical direction by means of a first groove-and-tongue joint and in the horizontal direction by means of a second groove-and-tongue joint and is held non-positively in the direction of the bar by means of the fastening screw.
In a way according to the invention, the arrangement may be designed in such a way that, in order to form to the first groove-and-tongue joint, a continuous horizontal longitudinal groove is provided in each case both in the bar and in the module and a common locating tongue engages into the two longitudinal grooves.
In a way preferred according to the invention, the arrangement may also be designed in such a way that, in order to form the first groove-and-tongue joint, a continuous horizontal longitudinal groove is made in the bar and the module has integrally formed on it a horizontal strip which projects perpendicularly to the plane face of the said module and which engages positively into the longitudinal groove of the bar.
Conversely, according to the invention, the arrangement may also be designed in such a way that, in order to form the first groove-and-tongue joint, a continuous horizontal longitudinal groove is made in the module and the bar has integrally formed on it a horizontal strip which projects perpendicularly to the beating face of the said bar and which engages positiv
REFERENCES:
patent: 5295450 (1994-03-01), Neely
patent: 5400727 (1995-03-01), Neely
patent: 5927219 (1999-07-01), Beyer
patent: 5954003 (1999-09-01), Beyer et al.
Nerbun Peter
Purdue David C.
Purdue John C.
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