FR2568276A1 - Electromagnetic system for gripping and inserting a rigid weft and weft store designed for this purpose - Google Patents

Abstract

This invention deals with a new system suitable for machines for weaving artificial canes, the weft of which is a metal rod covered with "kraft" paper previously cut to measure. The system consists of a store 1 filled with the covered rods 2. This store is held by means of the ribs 3 placed on rubber studs 4, the assembly as a whole being held on the support 5. Towards the bottom, a rod 2 is in position in the trough 6 in order to be attracted by the electromagnet 7 which is fastened to the rapier 8 of the weaving machine. The photocell 9 is positioned in such a way that the rod 2 passes through the beam 11, once it has been attracted by the electromagnet 7.

Description

 This invention deals with a new system adaptable to machines for weaving artificial rods whose weft is a metal rod covered with "kraft" paper cut to measure beforehand.

 The systems known in particular from French patent No. 2,126,220 and American patent No. 346,306 for carrying out such work uses shuttle pliers associated with a mobile weft thread donor or a pre-selection tank comprising a mechanical or pneumatic device ensuring a thrust causing a slight overshoot of the selected weft rod. Such devices required too many modifications of a shuttle or standard lance machine, hence the advantage of the present invention, the adaptation of which on lance machines is simple and achievable at low cost.

This invention consists of:
- Adaptation to the end of the lance of at least two electromagnets (for example three or four) arranged vertically ensuring by their lower part the grip and alignment of the metal frame rod.

 - The realization of a tank with weft stems provided with a bottom gradually narrowing to a width slightly greater than the diameter of the stem so as to finally allow passage to only one stem, this bottom thus forming funnel being curved laterally and extended by a rod stopper gutter arranged opposite the outlet opening of the reservoir funnel, said gutter being intended to be laterally disposed at least partially under the path of spear.

 Thus this frame tank does not require a mechanical frame selection system.

 According to a preferred embodiment the tank can be provided with an electric vibrator allowing the positioning without risk of blocking of the frames by vibration.

 Filling the tank is very easy and does not require special attention.

 To this assembly a circuit breaker by photocell is added to prevent any incident of failure of the frame to be picked up by the electromagnet or if the reservoir has not been filled in time; the whole machine stops working, except the electromagnet.

 This system allows you to have just the necessary frame lengths without having unusable surplus.

 For this purpose, inside the weft tank is provided an adjustable wall arranged transversely to weave with shorter rods if necessary.

Other characteristics and advantages of the invention will emerge from the detailed descriptions which follow and which are given solely by way of example of embodiment with reference to the appended drawings in which:
Figure 1 is a front view of a standard lance machine with the new system adapted to its left.

 Figure 2 shows a front view of the frame tank.

 Figure 3 is a side view of the tank of Figure 2.

 Figure 4 shows the weft taking by the electromagnets mounted on the lance of the loom.

 5 shows a section along A-A of Figure 4 showing a possible square shape in one direction or the other of the lance with the electromagnets. These same electromagnets must be higher than the bottom of the lance because it rests by a lateral extension downwards on the warp threads of the loom and also guided by these same warp threads, the other side being free to facilitate penetration into the gutter. The assembly below allows the continuation of the warp threads and not to be hung by the wefts as they pass through the crowd.

FIGS. 6A to 6C represent three corresponding sequences:
- when weft is taken from the tank;
- when passing through the crowd and when this frame is dropped by electromagnets whose current has been momentarily cut off;
- and finally, at the exit of the lance with its electromagnets from the crowd allowing it to intertwine and give birth to a new crowd.

 In FIG. 1, the reference (10) designates the fabric produced, while the references (8) and (9) respectively designate the warp threads and the wefts. The reference (1) shows a standard lance weaving machine (7) with its housing and support (2). At the end of the lance (7) electromagnets (6) are mounted therein for picking up the frames (9) in the tank (4). To the left of this loom, the reference (3) designates the support for the weft tank (4). This tank (4) is placed on rubber pads (12) which allow the electric vibrator (5) to do its job efficiently. Reference (11) shows the positioning of the photocell.

 Figure 2 shows us in more detail the frame tank (4).

Two ribs (14) hold the same tank in the desired position, the whole is placed on rubber pads (12) and fixed on the support (3). The reference (15) is the transverse wall for adjusting the volume of the reservoir as a function of the length of the frames. The reference (11) shows the photoelectric cell with its beam (13). Line A indicates the limit of the approximate stroke of the lance with the electromagnets in front of the beam of the photocell (11) which can thus do its job effectively.

 Figure 3 shows the side view of the frame tank (4) where the function of the photocell (11) is better exposed. We can see the beam (13) passing over the frame (9). Thus, if the weft does not pass as desired, the weaving machine stops, except the electromagnets, which makes it possible to remedy the incident which caused the blocking of the weft.

 In this view of the reservoir (4), the function of the lateral stop gutter (16) is highlighted. The lance (7) provided with these electromagnets (6) is ready to attract the weft (9) positioned by the stop gutter (16).

 Figure 4 gives an enlarged view of the lance (7) provided with an axially hollowed end in the lower part receiving the electromagnets (6) intended to hold the frame (9). This end is attached to the hollow lance previously cut and drilled for the passage of screws (18) for fixing an extension of the end (19).

 Figure 5 is a section along A-A of Figure 4 showing the positioning of the attached end (19) of the lance (7) resting on the warp son (8) in the crowd of weaving (17).

 FIG. 6A represents the grip of the frame (9) by the electromagnets (6) in the gutter (16) of the tank (4).

 FIG. 6B represents the electromagnets (6) having pulled through the crowd (17) and deposited therein the frame (9). At the same time, the frame (9) has given way in the gutter to a next frame (9bis).

 FIG. 6C shows that the weft (9) having been deposited in the crowd (17), the lance (7) emerges entirely from this crowd to let the latter intersect and create a new length of fabric. At this level the lance is ready to redo the same work as described in phase 6A to 6B.

 The invention as described is capable of variant embodiments, so to ensure better retention by the lance of the frame the ends of the electromagnet can be hollowed out so as to define a concave or V-shaped surface facilitating the positioning of the weft thread attracted, or by the lateral addition to normal electromagnets of positioning claws.

Claims (5)

 1) Weaving loom similar to rush fabric, the weft of which is a metallic wire wrapped in paper and cut to size beforehand, of the lance type characterized by:  - Adaptation to the end of the lance of at least two electromagnets arranged vertically ensuring by their lower part the grip and the alignment of the metal frame rod.  - the realization of a tank with weft stems provided with a bottom progressively narrowing to a width slightly greater than the diameter of the stem so as to finally leave the passage to only one stem, this bottom thus forming funnel being curved laterally and extended by a rod stopper gutter arranged opposite the outlet opening of the funnel of the reservoir, said gutter being intended to be disposed laterally at least partially under the trajectory of the launch.  2) A weaving machine according to claim 1 characterized by the presence of a circuit breaker by photoelectric cell making it possible to remedy any defect in the weft grip or its improper positioning or in the filling of the weft tank. disposed beyond the limit of the lance stroke.  3) Weaving machine according to claim 1 characterized in that the electromagnets are arranged at the lower part of one end (19) provided with an extension coming to be fixed by screws in the hollow part of the lance previously cut.  4) Loom according to claim 3 characterized by the positioning of the electromagnets whose lower part is arranged above the lower level of the lance.  5) Loom according to claim 1 characterized in that the reservoir (4) has a movable transverse wall (15) for adopting said reservoir to the length of the weft rods.