JPS584848A - Apparatus for controlling weft yarn conveying gripper of shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an important improvement in a device for controlling the reciprocating movement of a weft transport gripper of a shuttleless loom.

As known 1. One of the most important problems in a shuttleless loom is the control of the reciprocating movement of the weft transport gripper, and this problem is difficult for high-speed operation of the loom.

Many solutions have been adopted up to now, but none have been satisfactory. In particular, when fugitive bands are used to control grippers, the problem of high temperatures - caused by continuously repeated slippage between parts at very high speeds - has not been adequately solved. . In this type of equipment, it appears to be of considerable importance to improve the conditions in which the reciprocating rotational movement is transmitted from the gear to the gripper control band: between the teeth of the single wheel and the band slot; accuracy of the engagement; - smoothness of the engagement between said tooth and said slot; - flexibility of the band and the fact that this flexibility should persist over the entire area of the band; - stress in the band. Distribution t - Accurate engagement uniformly occurring between the gear and the band over the entire length of engagement.

The present invention satisfies the wishes of manufacturers and users of weaving machines with respect to the various requirements mentioned above, and also solves the aforementioned problems in a modern and saline manner when using high and very high weaving speeds. And to provide a device for controlling the movement of a weft conveying gripper of a shuttleless loom, which satisfactorily solves the problem.

A shuttleless loom according to the invention of the type which uses a pair of gears for short reciprocating rotations at the end of the loom's shed, and a pair of gripper advancement bands having longitudinally aligned central slots that mesh with the teeth of said gears. The weft transport gripper motion control device comprises a continuous fixed guide, said fixed guide extending around a large arc of the gear wheel and at a short distance from the gear wheel, and extending along said arc over a large arc of the gear wheel and at a short distance from the gear wheel. It is characterized in that both lateral parts of the band act on the side of the slot in order to keep the band in constant and precise engagement with the gear. Preferably, the slots in the band have an elongated rectangular shape and the teeth of the gear have a shape corresponding to the slots and have a periphery with rounded edges.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

To explain with reference to the drawings, the device of the present invention is equipped with a gear l for controlling the band 8 in each of the looms, and this gear gives back and forth movement to the band and the gripper carried on this band. It inserts the weft into the shed of the loom.

Tei 8 has a row of elongated rectangular slots 8 in its center,
These slots differ in shape and size from all slots hitherto made in bands used for the same purpose. The slot of the present invention is 4.5V! It is clearly stated in i. Belt through these miso holes! meshes with the surrounding teeth 4 of gear l, which have a corresponding or complementary shape (see FIG. 8). The band extends over a large arc of the gear, and the circumference of said teeth is characterized by a rounded green color.The arc of the gear l, over which the band 3 extends, is defined by guides, and these guides approaches the gear and partially surrounds the gear. As clearly shown in FIG. 2, the guide 1 is U-shaped so as to act on the side of the slotted hole 8 at point 6.7 on the lateral part of the band, so that the bottom of the tooth 4 lies in the said slot. It becomes possible to engage the hole continuously and reliably. The tooth 4 is a gear l
There are important advantages to the above device for correctly transmitting reciprocating motion to the weft transport grippers in the loom.

First, the teeth of the first gear are completely engaged in the slots 8 of the band - this is done precisely by the shape of the teeth and slots, and by the presence and contour of the guides 5, but conventionally This results in a mutual positioning or overlapping between the band and the gear wheel with unimaginable precision, which results in a particularly even distribution of the load on the teeth, thus reducing tooth wear, lowering temperatures and improving sound performance. It is possible to make it smaller.

Furthermore, the elongated rectangular shape of the slots in the band considerably reduces the bending stresses in the band and facilitates the deformation of the band when meshing with gears, without any deleterious effects in terms of strength and wear. In practice, the obi is bent with greater continuity than the conventional obi (the conventional obi has much smaller, especially less elongated, holes).

Finally, the rounded green periphery of the gear teeth 4 ensures a smooth engagement between the gear 1 and the band 2, without impact or wear.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention can be modified in various ways without departing from the scope of the invention.

[Brief explanation of the drawing]

1st WJ is an external view of the device of the present invention showing the arrangement of one of the gears, and FIG. 2 is a cross-section taken on lll-1 in FIG. FIG. 8 shows the shape of the teeth and shows the action of the fixed guide associated with the gear that ensures the continuity and accuracy of this engagement. FIG. 1 shows one gear of the device of FIG. 1; FIG. 14 shows a band of said device cooperating with the gear of FIG. 8; FIG. FIG. 5 is a cross-sectional view of the strip of FIG. 1. l...Gear 2...Band 8...Slot Number...Tooth 5...Guidance. Patent Applicant Pamatex Socheta Bel Acioni Jl Wataru's Engraving (Content - Permissible ↓) 1 Procedural Amendment August 6, 1981 1, Indication of Case 1982 Patent Application No. 80880 Z Invention Name: Weft conveying gripper motion control device for shuttleless loom 3, relation to the case of the person making the amendment Patent applicant name: Bamatex Socheta Bel Acioni 5
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Claims (1)

[Claims] A type of 1411 machine using a pair of gears making short reciprocating rotations at the end of the shed, and a pair of gripper advancement bands having longitudinally aligned central slots that mesh with the teeth of the gears. A weft conveyance gripper motion control device for a shuttleless loom, which is equipped with a continuous fixed guide.1. The fixed guide extends along the circumference of the gear, over a large arc of the gear and at a short distance from the gear, and for keeping the band in constant and precise engagement with the gear along the arc. A special feature is that both lateral parts of the band are configured to act on the side of the groove.
A weft conveyance gripper motion control device with the following characteristics: 1. A device according to claim 1, characterized in that the slot in the band has a substantially elongated rectangular shape, and the teeth of the gear have a shape corresponding to or complementary to the slot. A device that does this. & Apparatus according to claim 2, characterized in that said teeth substantially protrude from said gear wheel and have a circumference having a rounded green color.