Boots – shoes – and leggings
Patent
1986-01-13
1988-05-31
Smith, Jerry
Boots, shoes, and leggings
28204, D03J 114
Patent
active
047485680
DESCRIPTION:
BRIEF SUMMARY
The invention refers to an apparatus for drawing in warp threads into a harness, with a slide stepwise movable along the harness, the steps corresponding to the reed space. A sley hook is mounted on the slide and is longitudinally movable in a direction transverse to the slide path. The sley hook can be advanced automatically after each step of the slide into the reed space between two adjacent divisions of a harness to be disposed parallel to the slide path and, after securing the warp thread, withdrawn again.
In an article with the heading "New Method of Reeding for Very Fine Reeds in Metal and Textil Cloth Weaving", written by C. Th. Schreus in the review "mittex", no. 8/1976, an apparatus of the above kind is described on which the charging of each reed space by a warp thread is secured by the fact that the sley hook during insertion of the warp thread into the harness is not fully withdrawn from the plane of the latter. During the stepwise advance of the slide the sley hook passes through a notch in one division of a reed to the following dent against which it strikes. The notches of adjacent divisions are staggered with regard to each other and are sensed individually by the sley hook which is pivotable within the reed space. In this way an omission of a reed space can be avoided, enabling thus a faultless insertion even with the finest reeds.
This mechanical sensing has certain disadvantages. On one hand the manufacturing of the harness is made difficult and substantially rendered more expensive by the insertion of the notches onto the reed divisions and by the controlled assembling of the reed divisions with staggered notches. In addition the notches may impair the function of the harness as an element intended for being striked by the weft thread. Increased wear of the reed divisions is also to be taken into consideration. Finally, the sensing operation of the sley hook calls for supplementary devices on the apparatus.
As to the mechanical sensing referred to it is possible to take care of variations in the reed spacing in such a way that the lateral pressure of the sley hook on the reed divisions is monitored and the advance of the slide is corrected upon changes in that pressure. This kind of control, however, further increases the need for additional devices, and in addition on increases the susceptibility of the device to problems due to the multiple function of the sley hook and the complicated mechanical control devices associated therewith.
The object of the present invention is to develop an apparatus for inserting warp threads into a harness on which the displacement of the slide is controlled in dependency of the varying reed spacing and an apparatus which does not have the disadvantages referred to above.
The exact, step-by-step displacement of the slide represents a particular problem. This displacement is aggravated by the fact that the reed spacing across the width of the harness is not always constant, due to reasons of manufacturing. If the step distance of the slide were constant, but the reed spacing would vary, then drawing-in troubles would be unavoidable.
In order to solve this task, the apparatus according to the present invention is characterized by means for continuously touch-free measument of the reed spacing, means for determining the distance between the center of the reed space occupied by the sley hook and the center of the following reed space, and means for controlling the advance of the slide in step lengths according to the determined distances of the reed space centers.
A preferred embodiment of the invention consists in that a television camera is attached to the slide and views always a part of the sley hook, and that there is provided an electronic device that digitalizes the analog signals received from the camera by means of an analog-digital converter. The electronic digital device breaks up binarily the digital image displayed on a monitor into image points on a longitudinal axis of said monitor, counts with a calculating device the subsequent series of br
REFERENCES:
patent: 3072999 (1963-01-01), Cook et al.
patent: 4141120 (1979-02-01), Schank
patent: 4233716 (1980-11-01), Patel
G. Bopp & Co. AG, Metallgewebe-und Drahtwarenfabrik
Lastova John R.
Smith Jerry
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