FI88522C - Faestanordning Foer haknaolar - Google Patents

Description

1 p 8 522

The present invention relates to a hook for attaching hooks (hereinafter also more simply "needles") according to the preamble of claim 1. Such fastening devices are used, for example, in ribbon knitting machines, as is apparent from the EP application publication 110 271 10 of this applicant. However, the clamping device can also be used on raschel machines. In either case, it is placed on the needle boom of such a machine.

There is a need to make ribbons with 10 15 yarns / cm or more in the width direction using ribbon knitting machines or raschel machines. Of particular importance is elastic straps, as they are needed for underwear and sportswear.

It is known from U.S. Pat. No. 3,823,581 to mill grooves adjacent 20 adjacent to the second main part of the fastening device, into each of which a single needle shank is inserted. A similar one is known from Figures 8 and 9 of the above-mentioned EP publication. Here, too, the upper main part is a mere locking cover, which requires that the lower main part has grooves which are considerably deep. Both of the above; According to the publication, the depth of the grooves must be close to the height of the needle shaft in order for them to fulfill their function of supporting the needles and securing them against rotation.

There are limits to the maximum number of grooves that can be milled in the width direction of the second body portion 30 of the fastening device for each cm thereof. If the number of grooves increases by more than 10 / cm, then eventually the width of the steps between the grooves will be 0.2 mm or less. This cannot be avoided by using thinner needles, as the needles must have a certain stiffness, so the use of needles less than 0.4 mm wide is not appropriate.

2 38522

However, if group milling is used for milling the grooves, a group of adjacent grooves can be produced in one operation. Even in this case, it is not technically possible to mill grooves between which the steps are 0.2 5 mm or narrower and almost the height of the needle arm without creating a relatively large amount of wreckage due to the rupture of the steps.

It is an object of the present invention to make it possible to fasten more than 10 knits / cm.

This is achieved by the fastening device according to the invention, which is characterized in that the grooves are arranged opposite each other in both body parts and their depth is only a fraction of half the height of the needle arms.

According to the invention, the opposing grooves securely fasten the needle arms, with the grooves being located in the second body part, the others being opposite in the second body part. These grooves engage the needle only for a small part of the height of the needle shaft, in any case a substantially smaller distance than half the height of the needle shaft, so that most of the needle shaft remains outside the grooves.

Since, unlike in the past, the grooves are made in both body parts, a very small depth is sufficient for them. In this case, there is no longer any risk of damage to the steps between the grooves.

If, according to claim 2, the body parts are made of light metal, the inertia mass of the fastening device, which has to be pushed back and forth continuously in the reciprocating movement of the needle boom, is reduced. This can increase the production speed of the machines.

An embodiment is next described in connection with the drawing.

Fig. 1 is a sectional view of a fastening device according to the invention taken along line I-I of Fig. 2.

3 8 8 522

Figure 2 is a section along the line II-II in Figure 1, i.e. in the longitudinal direction of the needle.

The fastening device of Figures 1 and 2 has two light metal body parts, namely the lower part 2 and the upper part 4. through the openings engage the threaded groove of the lower part 2. Very low grooves 40, 10 are milled in the lower part, between which there are steps 42 which are substantially narrower than the grooves. The depth of the grooves 40 and 44 is substantially less than half the height 20 of the needle shaft so that most of the height of the needle shaft 15 is free.

The grooves are milled with a group cutter and in each case all the grooves of the same needle group at the same time. With the grooves low, there is no need to fear damage to stairs 42 and 46. The width of the stairs can be 0.15 or 0.2 mm.

The end 22 of the needles 20 is bent into an arc and the needles are fixed so that their ends rest towards the back side of the upper part 4. Thus, all are simplified in the simplest way in the longitudinal direction. This also allows for easy replacement and straightening of individual needles. As shown in Figures 1 and 2, the fastening device is made very simple and can be manufactured at low cost. The parts to be attached to the needle boom of a ribbon knitting machine or raschel machine are not shown here, but are known per se.

': 30 To replace the individual needles, unscrew the threaded bolts without removing them, pulling the individual needles backwards and pushing the new ones back into place, straighten the needle pack with the upper part 4 and tighten the clamping bolts again.

Claims (2)

4,88522 A fastening device for hooks (needles) for fastening them to a needle beam of a ribbon knitting machine or raschel machine 5, which fastening device has the following characteristics: B) the fastening device has grooves (40,44) for receiving each needle arm (20), and the device is characterized in that c) the grooves (40,44) are arranged opposite each other in both body parts (2,4) and their depth is 15 only a fraction of the height of the needle arms (20). Fastening device according to Claim 1, characterized in that the body parts (2,4) are made of light metal. 5 * 8522