GB2049744A - Apparatus for Forming the Shed in Circular Looms - Google Patents

Abstract

A circular loom has healds 6,7 arranged in concentric circles about the main shaft the healds being carried by bars 8,9 each hinged to a cam operated lever 10, 11 pivoted intermediate its ends and arranged tangentially to the cam, which may be a grooved cam or face cam as in Figure 3 (not shown). <IMAGE>

Description

SPECIFICATION Apparatus for Forming the Shed in Circular Looms The invention relates to an apparatus for forming the shed in a circular loom, comprising parting shafts disposed in concentric circles about the main shaft of the loom, wherein the shafts bars of the parting shafts are pivoted to the outer ends of levers which are pivotably mounted in the frame of the loom and of which the inner ends carry rollers or slide blocks supported on respective control cams rotating concentrically about the main shaft.

In an apparatus of this kind known from CH-PS 601 530, the pivoted levers extend radially inwardly so that they surround the main shaft of the loom in spoke formation. This known arrangement has the disadvantage that the internal space of the circular loom is cluttered up by the inwardly directed pivoted levers and the control cams which, because of the radial arrangement of the pivoted levers, have relatively small diameter. Further, in the known apparatus the control cams have to be spherical so that the rollers secured to the pivoted levers can follow the cams without any additional sliding motion that would create friction.

It is therefore the aim of the present invention to provide a simplified apparatus of the aforementioned kind which leaves the interior of the circular loom substantially free.

According to the invention, this aim is achieved in that the pivoted levers are set tangentially to the control cams and the rollers or slIde blocks are attached to the inner sides thereof. The apparatus according to the invention not only permits the interior of the circular loom to be kept free of machine components, which are particularly necessary if the tubular woven fabric is to be pulied downwardly over the weaving ring, but the mounting of the pivoted levers is also subjected to lower stresses because, by reason of the tangential application of the pivoted levers to the control cams, no reaction forces caused by the friction can act on the control cams in the direction of the rotary axis of the roller, which might otherwise tend to twist the pivoted levers about an axis perpendicular to the pivotal axis.

Advantageous embodiments of the invention have been described in subsidiary claims 2 and 3.

Examples of the invention will now be described in more detail with reference to the drawing, wherein Fig. 1 is a diagrammatic side elevation of the shed-forming equipment of a circular loom; Fig. 2 is a plan view of the Fig. 1 apparatus, and Figs 3 and 4 are views corresponding to Figs. 1 and 2 of a further embodiment of the shedforming equipment.

Fig. 1 illustrates diagrammatically only the right-hand shed of a wave shed circular loom.

This shed is designated 1. The warp threads 2, 3 forming the shed 1 pass through a reed 4 to a weaving ring 5. The warp threads 2, 3 are held open by parting shafts 6, 7 which are driven by shaft bars 8, 9. The shaft bars 8, 9 are hinged to pivoted levers 10, 11 which are rotatably mounted in bearings 12 of the frame (not shown) of the loom. Rollers 13, 14 loosely rotatably mounted on the free ends of the pivoted levers 10, 11 follow grooves 1 5, 1 6 of a cam plate 1 7.

The pivoted levers 10, 11 extend tangentially to the grooves 1 5, 1 6 of the cam plate 1 7. The cam plate 1 7 is freely rotatable in the frame of the loom. One end face of the cam plate is secured to a gear 1 8 in a mesh with a pinion driven by the main shaft (not shown) of the loom. During operation of the loom, the cam plate 1 7 is set in rotation and the shed 1 is changed in rhythm with the appropriate configuration of the grooves 1 5, 16.

In the shed formation of Figs. 3, 4, the cams on which the rollers 13, 14 run are provided on two coaxial cam plates 17.1 and 17.2. The cams may also be in the form of grooves as in Fig. 1. Here, again, the pivoted levers 10, 11 are disposed tangentially to the cams of the cam plate 17.1 and 17.2.

The tangential arrangement of the pivoted levers relatively to the cam plates provides a large free space which can utilised for drawing in internal layers as is described in DE-OS........

The cams of the cam plates can be produced by means of simple milling operations on conventional machines and no lateral moments act on the pivoted levers.

Claims

1. Apparatus for forming the shed in a circular loom, comprising parting shafts arranged in concentric circles about the main shaft of the loom, wherein the shaft bars of the parting shafts are pivoted to the outer ends of levers which are pivotably mounted in the frame of the loom and of which the inner ends carry rollers or slide blocks supported on respective control cams rotating concentrically about the main shaft, characterised in that the pivoted levers (10, 11) are set tangentially to the control cams (1 5, 16, 17.1, 17.2) and the rollers (13, 14) or slide blocks are attached to the inner sides thereof.

2. Apparatus according to claim 1, characterised in that the control cams are grooves (15, 16) formed in the outside of a rotary cylinder (17).

3. Apparatus according to claim 1, characterised in that the control cams are formed by the end faces or grooves of two concentric cylinders (17.1, 17.2) of which the inner cylinder (17.1) projects beyond the outer cylinder (17.2).

4. Apparatus for forming the shed in a circular loon constructed and arranged substantially as hereinbefore described and shown in Figs. 1 and 2, or 3 and 4 of the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Apparatus for Forming the Shed in Circular Looms The invention relates to an apparatus for forming the shed in a circular loom, comprising parting shafts disposed in concentric circles about the main shaft of the loom, wherein the shafts bars of the parting shafts are pivoted to the outer ends of levers which are pivotably mounted in the frame of the loom and of which the inner ends carry rollers or slide blocks supported on respective control cams rotating concentrically about the main shaft. In an apparatus of this kind known from CH-PS 601 530, the pivoted levers extend radially inwardly so that they surround the main shaft of the loom in spoke formation. This known arrangement has the disadvantage that the internal space of the circular loom is cluttered up by the inwardly directed pivoted levers and the control cams which, because of the radial arrangement of the pivoted levers, have relatively small diameter. Further, in the known apparatus the control cams have to be spherical so that the rollers secured to the pivoted levers can follow the cams without any additional sliding motion that would create friction. It is therefore the aim of the present invention to provide a simplified apparatus of the aforementioned kind which leaves the interior of the circular loom substantially free. According to the invention, this aim is achieved in that the pivoted levers are set tangentially to the control cams and the rollers or slIde blocks are attached to the inner sides thereof. The apparatus according to the invention not only permits the interior of the circular loom to be kept free of machine components, which are particularly necessary if the tubular woven fabric is to be pulied downwardly over the weaving ring, but the mounting of the pivoted levers is also subjected to lower stresses because, by reason of the tangential application of the pivoted levers to the control cams, no reaction forces caused by the friction can act on the control cams in the direction of the rotary axis of the roller, which might otherwise tend to twist the pivoted levers about an axis perpendicular to the pivotal axis. Advantageous embodiments of the invention have been described in subsidiary claims 2 and 3. Examples of the invention will now be described in more detail with reference to the drawing, wherein Fig. 1 is a diagrammatic side elevation of the shed-forming equipment of a circular loom; Fig. 2 is a plan view of the Fig. 1 apparatus, and Figs 3 and 4 are views corresponding to Figs. 1 and 2 of a further embodiment of the shedforming equipment. Fig. 1 illustrates diagrammatically only the right-hand shed of a wave shed circular loom. This shed is designated 1. The warp threads 2, 3 forming the shed 1 pass through a reed 4 to a weaving ring 5. The warp threads 2, 3 are held open by parting shafts 6, 7 which are driven by shaft bars 8, 9. The shaft bars 8, 9 are hinged to pivoted levers 10, 11 which are rotatably mounted in bearings 12 of the frame (not shown) of the loom. Rollers 13, 14 loosely rotatably mounted on the free ends of the pivoted levers 10, 11 follow grooves 1 5, 1 6 of a cam plate 1 7. The pivoted levers 10, 11 extend tangentially to the grooves 1 5, 1 6 of the cam plate 1 7. The cam plate 1 7 is freely rotatable in the frame of the loom. One end face of the cam plate is secured to a gear 1 8 in a mesh with a pinion driven by the main shaft (not shown) of the loom. During operation of the loom, the cam plate 1 7 is set in rotation and the shed 1 is changed in rhythm with the appropriate configuration of the grooves 1 5, 16. In the shed formation of Figs. 3, 4, the cams on which the rollers 13, 14 run are provided on two coaxial cam plates 17.1 and 17.2. The cams may also be in the form of grooves as in Fig. 1. Here, again, the pivoted levers 10, 11 are disposed tangentially to the cams of the cam plate 17.1 and 17.2. The tangential arrangement of the pivoted levers relatively to the cam plates provides a large free space which can utilised for drawing in internal layers as is described in DE-OS........ The cams of the cam plates can be produced by means of simple milling operations on conventional machines and no lateral moments act on the pivoted levers. Claims

1. Apparatus for forming the shed in a circular loom, comprising parting shafts arranged in concentric circles about the main shaft of the loom, wherein the shaft bars of the parting shafts are pivoted to the outer ends of levers which are pivotably mounted in the frame of the loom and of which the inner ends carry rollers or slide blocks supported on respective control cams rotating concentrically about the main shaft, characterised in that the pivoted levers (10, 11) are set tangentially to the control cams (1 5, 16, 17.1, 17.2) and the rollers (13, 14) or slide blocks are attached to the inner sides thereof.

2. Apparatus according to claim 1, characterised in that the control cams are grooves (15, 16) formed in the outside of a rotary cylinder (17).

3. Apparatus according to claim 1, characterised in that the control cams are formed by the end faces or grooves of two concentric cylinders (17.1, 17.2) of which the inner cylinder (17.1) projects beyond the outer cylinder (17.2).

4. Apparatus for forming the shed in a circular loon constructed and arranged substantially as hereinbefore described and shown in Figs. 1 and 2, or 3 and 4 of the accompanying drawings.