Textiles: knitting – United needle machines – Straight
Patent
1994-03-23
1995-08-22
Calvert, John J.
Textiles: knitting
United needle machines
Straight
66208, 66123, 66114, D04B 2706, D04B 3508
Patent
active
054429366
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for clamping and guiding crocheting needles, in particular latch type needles, lace needles, and the crocheting needles which the experts call "patent needles". The device must be such that it can be used on crocheting machines in general, in particular on crochet galloon machines. From the EP-PS 0 110 271 (BERGER) a device is known for the clamping of crocheting needles, which, however, does not co-operate with a known knock-over comb, but with a knock-over bar with an upper free, straight edge. On the other hand, a special construction of the bottom part and clamping cover of a clamping device for crocheting needles is known from the EP-PS 0 244 656 (BERGER). There the needle shanks are placed in rectangular grooves of the bottom part and clamping cover, between which rectangular webs remain.
By the present invention, on the one hand a clamping device for the crocheting needles, and on the other hand a knock-over comb are to be created, which permit a very fine spacing, i.e. at least 12, in particular 14, however, also further needles per cm of machine width. It has proved inexpedient to mill in grooves with a rectangular cross-section in this great fineness. A problem in this connection was the obtaining of the necessary precision. On the other hand it proved inexpedient to work with a knock-over bar with a straight upper edge. It was, on the contrary, necessary to guide the needle shanks to prevent that associated eye needles guide the warp threads around the wrong or around two crocheting needle heads each. In addition, measures were required to ensure that also with the high required fineness, the distances between the lengthwise threads of a to be crocheted band or the like are accurately maintained during the mesh formation.
By the invention according to claim 1, this object can be achieved by a clever combination of various measures, only some of which are already known. Surprisingly, bands, in particular elastic bands, can be crocheted with same, the lengthwise threads of which are positioned at identical distances from one another, also in the case of a spacing of in particular 14 per cm of machine width, so that a very uniform looking band can be produced.
Furthermore, the problems of the clamping and guiding of the crocheting needles are solved in a perfect manner. What proved important for the high precision when producing the grooves of the clamping device and the precise clamping-in of the needle shanks, was the V-shaped arrangement of the wall surfaces of the grooves (needle beds).
Another important aspect lies in creating a possibility to guide the clamping device to very close to the teeth of the needle comb, so that the mounting of the crocheting needles inside the clamping device also acts on that part of the crocheting needles which during operation projects beyond the teeth.
Further developments of the invention can be noted from the sub-claims.
The accuracy of the distances between the lengthwise threads of the crocheted bands can be positively influenced by the proper choice of the clamping-in length of the crocheting needles. If during the knock-over operation the heads of the crocheting needles can be retracted so far that they, for example, only still project by 2 mm, no irregularity of the crocheted band can be perceived.
The parts of the knock-over comb provided with teeth can be accommodated in a groove open to the top of a holding bar, as a result of which a high precision of the distances between the teeth can be obtained.
The knock-over comb can, in principle, be constructed in two different ways, i.e. on the one hand with blocks that are arranged closely together, each of which has an upwardly pointing tooth, and on the other hand with plates which at the top have teeth with wall surfaces that are inclined towards one another in the shape of a V.
The grooves produced in this way have in particular triangular shape, but may have rectangular or any inbetween shapes. All that is important is that the needle shanks can be inserted from the to
REFERENCES:
patent: 2749729 (1956-06-01), Noe
patent: 3823581 (1974-07-01), Russo
patent: 4571961 (1986-02-01), Berger et al.
patent: 4603561 (1986-08-01), Berger et al.
patent: 4683727 (1987-08-01), Zorimi
patent: 4895006 (1990-01-01), Speich
Berger Johann
Schulein Fritz
Berger GmbH
Calvert John J.
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