GB2247694A

GB2247694A - Electromagnetic jacquard control device

Info

Publication number: GB2247694A
Application number: GB9118354A
Authority: GB
Inventors: Josef Roth
Original assignee: Karl Mayer Textilmaschinenfabrik GmbH
Current assignee: Karl Mayer Textilmaschinenfabrik GmbH
Priority date: 1990-09-07
Filing date: 1991-08-27
Publication date: 1992-03-11
Anticipated expiration: 2011-08-27
Also published as: JPH0627393B2; DE4028390A1; DE4028390C2; GB9118354D0; JPH04245947A; GB2247694B; KR920006557A; KR0156255B1; CH685017A5

Abstract

An electromagnetically operating jacquard control device has a plurality of setting bodies (16) which are lifted by a lifting plate (7) and are selectively retained in lifted position by the cooperation of an associated hook (26) with a counterhook (27) held at a fixed height. An associated control electromagnet (19) has an armature mounted pivotably about an axis (24) to determine whether or not the hook (26) engages the counterhook (27). The lifting plate (7) carries a take-up device (29) which pivots the armatures (21) towards the associated electromagnets (19). Relatively low magnetic forces are sufficient. Small magnets can be used. The armature is preferably mounted on an angle lever (23) whose other arm provides the counterhook (27). <IMAGE>

Description

4 f;--- 1 1 Electromaqnetically operatinq Jacquard control device The

invention relates to an electromagnetically operating jacquard control device with a pluralitlo of control elements which are each connected to a setting body and each of which is assigned an electromagnet having an armature, and with a lifting plate which lifts the setting bodies out of a position of rest into a working position in each work cycle, thereby laying the armatures against the electromagnets, and is subsequently lowered again, so that the setting bodies remain in the working position or return to the position of rest in dependence on the state of energisation of the electromagnets.

In a known jacquard control device of this type ("kettenwirk-praxis" 2/88, pages 11 and 12), the setting bodies are fastened to the armature, so that, when the setting bodies are raised into the working position, the armatares are also necessarily laid against the associated electromagnets.

The object on which the invention is based is to provide an electromagnetically operating jacquard control device of the type described in the introduction, which makes it possible to work with smaller electromagnets and therefore also a more compact construction.

This object is achieved, according to the invention, in that each setting body has a hook which, to determine the working position, interacts with a f k_ counterhook held at a fixed height, in that each armature is mounted pivotably about an axis and as a result of the pivoting movement displaces the counterhook out of or into the path of the setting-body hook, and in that the lifting plate raises the setting bodies beyond the working position in a selected range and carries a takeup device which pivots the armatures towards the associated electromagnets when the setting bodies are located in the selected range.

In this construction, the setting bodies and armatures are separated from one another. The pregtress exerted on the setting bodies via the harness cord is absorbed by the counterhook held at a fixed height. It does not subject the armature to any load. Lower magnetic forces are therefore sufficient; the electromagnets can be made smaller and be Arranged next to one another in a larger number over a given length. Furthermore, the armature is in a specific position in relation to the electromagnets, because the armature executes only a small pivoting travel and is fixed locally by its pivot axis. This too contributes to reducing the necessary magnetic forces. Conversely, however, it has been shown that even small pivoting movements suffice to ensure a reliable separation between the hook and counterhook. The take-up device guarantees that, despite the separation of the armature and setting body, all the armatures are laid reliably against the associated electromagnet.

It is beneficial if the take-up device acts on the armatures with a spring element being interposed. Slight irregularities can be compensated in this way.

The take-up device is preferably formed essentially by a strip extending vertically next to the setting bodies. This affords a space-saving design and also leads to a reinforcement of the lifting plate.

It is advantageous, furthermore, if the electromagnets are arranged above the lifting plate in such a way that the take-up device engages approximately in the mid-plane of the armatures, and the paths of movement of the hooks extend laterally relative to this. In this 11 i- ', design, the ends of the armature or of the lever carrying it are located approximately vertically above the paths of movement of the hooks, thus affording a space-saving design in the direction of the armature also.

In an especially simple embodiment, the armature is attached to one arm of an angle lever and the counterhook to its other arm. The pivot axis then serves to hold the counterhook at a fixed height when it interacts with the hook of the setting body. If the other arm of the angle lever extends downwards and the hook is formed on the setting body, the energisation of the electroilagnet causes the counterhook to release the setting body. If the other arm of the angle lever extends upwards and the hook is connected to the setting body via a spring element, the energisation of the electromagnet causes the setting body to remain in the working position.

In an especially simple embodiment, the supporting element is an angle lever and the armature is attached to one arm of this and the counterhook to its other arm. The pivot axis then serves to hold the counterhook at a fixed height when it interacts with the hook of the setting body. If the other arm of the angle lever extends downwards and the hook is formed on the setting body, the energisation of the electromagnet causes the counterhook to release the setting body. If the other arm of the angle lever extends upwards and the hook is connected to the setting body via a spring element, the energisation of the electromagnet causes the setting body to remain in the working position.

In another embodiment, the counterhook is attached to a spring element which is fastened to the upper end and which is displaceable as a result of the pivoting movement of the supporting element. In this construction, all the forces acting on the setting body are absorbed by the fastening point of the spring element.

At the same time, the armature can be attached to one arm of a supporting element which is designed as an angle lever and the other arm of which forms a stop.

Furthermore, it is recommended to provide a push q_ is back spring between the armature and one pole of the electromagnet, so that the armature does not adhere to the magnet as a result of residual forces.

I.t is especially recommended that the armature be attached to the supporting element so as to be pivotable about an axis arranged between the two pole faces of the electromagnet. This ensures an automatic matching of the armature to the pole faces.

The invention is explained in more detail below by means of preferred exemplary embodiments illustrated in the drawing. In this: QP Figure 1 shows a diagrammatic side view of the jacquard control device according to the invention, Figures 2 to 4 show enlarged representations of the working region in three different positions, Figures 5 to 7 show a modified embodiment of the working region in three different positions, and Figures 8 to 10 show a further alternative version of the working region in three different positions.

Figure 1 shows a frame 1 with vertical guide rods 2 and 3 and with a bearing 4 for the shaft 5 of an eccentric 6. A lifting plate 7 has an aperture 8 surrounding the eccentric 6 and roller bearings 9 and 10, by means of which the lifting plate 7 is guided on the guide rods 2 and 3. When the eccentric 6 is rotated, the lifting plate 7 moves in the vertical direction.

Control elements 11 in the form of shift pins or displacement sinkers, which can displace jacquard eye needles assigned to them by one needle division each, are guided in bars 12 and are loaded there by springs 13. They are connected via harness cords 14 to drawhooks 15 which are formed on setting bodies 16 and which pass through the lifting plate 7. The control elements 11 and therefore the setting bodies 16 can assume a position of rest, in which the setting bodies rest in a seat surface 17 of the lifting plate 7 (on the right in Figure 1), or a working position, in which the control element 11 and the associated setting body 16 are raised (on the left in Figure. 1). 'These positions are obtained by means of an 1 o' 4 f q-: T%_ electromagnetic arrangement 18, such as is explained in more detail below in conjunction with the figures. Four parallel grooves, in which, for example, 256 setting bodies are arranged, serve as a seat surface.

In the exemplary embodiment of Figures 2 to 4, the magnet arrangement 18 has an electromagnet 19 with a U-shaped core and a winding 20 and with an armature 21. The latter is fastened to one arm 22 of an angle lever 23 which is pivotable about an axis 24. The setting body 16 carries a spring element 25 with a hook 26 which can interact with a counterhook 27 on the other arm 28 ef the angle lever 23. moreover, attached to the lifting plate 7 is a take-up device 29 having the form of a strip which extends vertically next to the setting bodies 16. This strip acts on the armature 21 or the arm 22, with a spring element 30 being interposed, specifically approximately in the mid-plane of the electromagnet 19. Furthermore, a push-back spring 31 is also provided in one pole face of the electromagnet 19, in order to push the armature away reliably when the electromagnet 19 is not energised. In this case, a nose 32 forms a stop which determines the end position of the pivoting movement.

Figure 2 shows the lifting plate 7 in its highest position, in which the setting body 16 is located in the selected range. Figures 3 and 4 show the lifting plate 7 in its lowest position, the setting body 16 assuming its position of rest in Figure 3 and its working position in Figure 4. In particular, if the electromagnet 19 is not energised in the position of Figure 2, during the downward movement of the lifting plate 7 the counterhook 27 pivots back into the position illustrated in Figure 3, so that the setting body 16 together with the lifting plate 7 returns to the initial position. In contrast, if the electromagnet 19 is energised, the counterhook 27 maintains the position of Figure 2, so that the hook 26 can interact with it and the setting body 16 be retained in the working position.

In the embodiment according to Figures 5 to 7, reference symbols increased by 100 are used for - 6 corresponding parts. The essential difference from Figures 2 to 4 is that the other arm 128 of the two-armed lever 123 carrying the armature 121 on the first arm 122 is directed downwards, so that the counterhook 127 can interact with a hook 126 attached directly to the setting body 116. To allow the counterhook to penetrate into the setting body 116, the latter is provided with a longitudinal slot 133.

This results in the functional difference that the setting body 116 returns to the position of rest when the electromagnet 119 is energised and is held In the working position when the electromagnet is not energised.

In the further exemplary embodiment of Figures 8 to 10, reference symbols increased by 200 in relation to Figures 2 to 4 are used for corresponding parts. The counterhook 227 is located at the end of a spring element 234 which has a clamping point 235. This spring element is pressed obliquely outwards by the armature 221 or the arm 222 carrying it, when the electromagnet 219 is energised (see Figure 8). When the lifting plate 207 is then lowered, the setting body 216 follows it into the position of rest (Figure 9). In contrast, if the electromagnet is not energised (Figure 10), the counterhook 227 retains the setting body 216 on the hook 226 in the working position.

There are various possibilities for the de-sign of the resilient element 30. Thus, a continuous rail made of elastic material can be provided. Each individual armature can also be assigned an individual spring, for example a compression spring with a bolt.

7

Claims

1. Electromagnetically operating Jacquard control device with a plurality of control elements which are each connected to a setting body and each of which is assigned an electromagnet having an armature, and with a lifting plate which lifts the setting bodies out of a position of rest into a working position in each work cycle, thereby laying the armatures against the electromagnets, and is subsequently lowered again, so that the setting bodies remain in the working position or return to the position of rest in dependence on the state of energisation of the electromagnets, characterised in that each setting body has a hook which, to determine the working position, interacts with a counterhook held at a fixed height, in that each armature is mounted pivotably about an axis and as a result of the pivoting movement displaces the counterhook out of or into the path of the setting-body hook, and in that the lifting plate raises the setting bodies beyond the working position in a selected range and carries a takeup device which pivots the armatures towards the associated electromagnets selected range

2. Jacquard characterised armatures with

3. Jacquard characterised when the setting bodies are located in the control device according to claim 1, in that the take-up device acts on the a spring element being interposed.

control device according to claim 1 or 2, in that the take-up device is formed essentially by a strip extending vertically next to the setting bodies.

4. Jacquard control device according to any of claims 1 to 3, characterised in that the electromagnets are arranged above the lif ting plate in such a way that the take-up device engages approximately in the mid-plane of the armatures, and the paths of movement of the hooks extend laterally relative to this.

5. Jacquard control device according to any of claims 1 to 4, characterised in that the supporting element is an A7 o 9J 8 angle lever and the armature is attached to one arm of this and the counterhook to its other arm.

6. Jacquard control device according to claim 5, characterised in that the other arm of the angle lever extends downwards and the hook is formed on the setting body.

7. Jacquard control device according to claim 5. characterised in that the other arm of the angle lever extends upwards and the hook is connected to the setting body via a spring element.

8. Jacquard control device according to any of c:raims 1 to 4, characterised in that the counterhook is attached to a spring element which is fastened to the upper end and which is displaceable as a result of the pivoting movement of the supporting element.

9. Jacquard control device according to claim 8, characterised in that the armature is attached to one arm of a supporting element which is designed as an angle lever and the other arm of which forms a stop.

10. Jacquard control device according to any of claims 1 to 9, characterised by a push-back spring between the armature and one pole of the electromagnet.

11. Jacquard control device according to any of claims 1 to 10, characterised in that the armature is attached to the supporting element so as to be pivotable about an axis arranged between the two pole faces of the electromagnet.

12. Jacquard control device substantially as herein described with reference to and as illustrated in the accompanying drawings.

Published 1992 at The Patent Office. Concept House, Cardiff Road. Newport, G-entNP9 IRH.Further copies maybe obtained from Sales Branch. Unit 6. Nine Mile Point- Cwmfelinfach. Cross Keys, Newport, NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray. Kent I 1