GB2118981A - Electromechanical converter for controlling dobbies - Google Patents

Abstract

A carriage 1, moved by a cam 3, carries electromagnets 2 which, when selected, raise pivoted barriers so that selection pins 4 are not moved by movement of the carriage 1. Non- selected electromagnets 2 do not pivot the barriers so that they engage the pins 4 which are then moved by the carriage to engage, e.g. the hooks of a dobby. <IMAGE>

Description

SPECIFICATION Electromechanical converter The present invention relates to an electromechanical converter of pilot pulses to impulses of force, for the purpose of controlling mechanisms of textile machines, particularly dobbies.

The textile machines hitherto known, of which particularly dobbies and Jacquard machines are most frequently controlled by means of cards of various types, from which the pilot pulse is sensed preferably by mechanical means, e.g. by sensing pins with punched cards, and transmitted also by mechanical converters to the machine control, e.g.

the retaining hooks of the dobby. At present, in textile machines there are used electromechanical converters for converting pilot pulses to impulses of force, comprising an electromagnet, by means of which the pilot pulse is converted to an impulse of force. The electromagnet is preferably mounted stationarily, and the part to be controlled, e.g. the already mentioned retaining hooks of the dobby, is connected to its armature by means of a suitable transmission.

Both known converter types have certain disadvantages. The mechanical converter has considerable single-purpose applicability and limitations following from the memory type of the card. The electromechanical converters show primarily limitations following from the dependence of the impulse of force level from the size of the used electromagnet.

The purpose of the present invention consists in constituting an electromechanical converter of the simplest possible construction, reliable in operation, of which the impulse of force level has no relation with the size of the applied electromagnet. It is also the purpose of the present invention to achieve a maximum versatility of its application, i.e. for textile machines in which the program is scanned from cards, as well as for textile machines, in which non-conventional control, e.g. digital control, is used.

According to the present invention there is provided an electromechanical converter of pilot pulses to impulses of force for controlling mechanisms of textile machines, particularly dobbies, wherein an electromagnet is mounted on a carrier, which is arranged reciprocably movably opposite an end part of a spring loaded force pin mounted on a holder opposite the carrier, a spring loaded barrier, which is connected with an armature of the electromagnet, being mounted on the carrier swingably facing the end of the spring loaded force pin.

Due to the simplicity of workmanship, it is suitable to provide the carrier with at least one guiding pin for the pressure spring, by means of which the roller, which is mounted on the carrier, is held in engagement with the driving cam for causing the reciprocatory motion of the carrier.

It is advantageous, from the viewpoint of little layout and small built-up area, to provide on the carrier a recess for the end part of the force pin, while the spring loaded barrier is situated opposite the opening of said recess on a wall of the carrier said wall being adapted as a support of said barrier.

For the purpose of achieving maximum reliability while using the smallest possible electromagnet, it is advantageous to mount the spring loaded barrier on the carrier by means of an open joint on a bracket connected with the electromagnet holder on the carrier, while said barrier is spring loaded on the side of the open joint by means of a spring.

It is advantageous, when the spring loaded barrier is made of a material with good sliding properties and is detachably connected with its middle part to the armature of the electromagnet, thus diminishing its mass.

It is advantageous due to simplicity of design, when the guiding pin is freely displaceable in a guideway formed on the holder, while a pressure spring is arranged thereon, which bears with one end against the holder and with the other against the carrier.

It is also advantageous, that the electromechanical converter is easily applicable on dobbies hitherto known.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a section through the electromechanical converter; Fig. 2 is a plan view of the electromechanical converter; Fig. 3 is a section through the electromechanical converter at the maximum stroke of the cam; and Fig. 4 is a detailed view of the spring loaded barrier with the electromagnet armature.

The electromechanical converter includes a reciprocatory carrier 1 for an electromagnet 2, a driving cam 3, and a spring loaded force pin 4 mounted on a holder 5 opposite carrier 1 of electromagnet 2. It is advantageous to arrange the electromechanical converter in an independent housing 6, which is detachably connected to the textile machine.

Carrier 1 is mounted opposite holder 5 inside housing 6 in a guideway 7 consisting of packing pieces 8, 9 mounted on the side walls 10 of housing 6 by means of screws 11. The carrier 1 is pressed by one or, to prevent sticking, by two compression springs 12 with the roller 13 mounted thereon, to the driving cam 3 on shaft 14, which is rotatably mounted in the sidewalls 10 of housing 6.

The compression springs 12 are arranged between the carrier 1 and holder 5 on guiding pins 15, which are anchored with one end on the carrier 1, and with their other end displaceably mounted in the openings 32 in holder 5. When both the guiding pins 1 5 and openings 32 in the holder 5 are suitably dimentioned, the carrier 1 need not be mounted in guideway 7 on the sidewalls of the housing.

The holder 5 is fixed on the sidewalls 10 of housing 6 by means of screws 16. On holder 5, spring loaded force pin 4 is displaceably mounted, of which spring 1 7 bears with one end against projection 1 8 on the force pin 4 and with its other end against holder 5. Part 19 of force pin 4, which is intended to act by force upon the part to be acted upon, e.g. a not represented retaining hook of the dobby, is shaped suitably in accordance with necessity. The carrier 1 is provided in the arrangement as shown in Figs. 1 and 3 with a recess 21 for the part 20 of force pin 4. Opposite the orifice of recess 21 in wall 22 of the carrier, and simultaneously facing the end of force pin 4, a spring loaded barrier 23 is mounted swingablyon carrier 1.When the part 20 of force pin 4 is situated above or below the carrier 1 , recess 21 on carrier 1 is not necessary.

The spring loaded barrier 23 is controlled by electromagnet 2. In a simplified embodiment, it is simultaneously the armature 24 of electromagnet 2. In a more intricate embodiment as shown in Fig.

4, it is more advantageous to use a tough material for spring loaded barrier 23 and to connect it in its middle part with armature 24, e.g. by rivets 25.

On carrier 1, the spring loaded barrier 23 is mounted together with electromagnet 2 by means of holder 26, which is fastened to carrier 1 by means of screws 27. Electromagnet 2 is fastened on holder 26 by screws 28. The spring loaded barrier 23 is connected by open joint 29 to bracket 30, which is fastened by screws 31 on holder 26 and is held by a compression spring in extended position facing the end of force pin 4 over recess 21 on the wall 22 of carrier 1. This makes it possible to displace the spring loaded barrier 23, upon being engaged by force pin 4, for a short distance to bear against wall 22 of carrier 1, which is suitably adapted for that purpose.

The operation of the electromechanical converter, e.g. when shifting the retaining hook to the tow hook of a not represented dobby, proceeds as follows: The driving cam 3 is driven synchronously, by a not represented transmission, with the dobby. By the rotary motion of the driving cam 3, the reciprocatory motion of carrier 1 of electromagnet 2 is obtained. When roller 13 moves about the small diameter of driving cam 3, a pilot pulse is emitted, by means of which the electromagnet is either connected to or disconnected from the power supply. When, upon the pilot pulse, the electromagnet 2 is not under power supply, the spring loaded barrier 23 is extended facing the end of force pin 4 and prevents it from entering recess 21.Upon advancing motion of carrier 1, which is obtained by movement of roller 13 about the enlarging diameter of driving cam 3, the force pin 4 is forced against action of spring 1 7 and performs an impulse of force, by which the not represented retaining hook is shifted on the tow hook. When, however, at the time at which roller 13 moves about the small diameter of driving cam 3, power is fed to electromagnet 2 by the pilot pulse, electromagnet 2 attracts armature 24. In this manner, the spring loaded barrier 23 is moved away from the space between force pin 4 and recess 21.

During the following advancing motion of carrier 1, the part 20 of force pin 4 engages recess 21, without any motion of force pin 4. No impulse of force is exerted and the retaining hook is not shifted on the tow hook.

The electromagnetic converter can operate in an analogous manner, e.g. in knitting machines for controlling cams. The force pin engages in that case, upon advancing motion, the cam into operation, or retains it out of operation.

Claims (7)

1. An electromechanical converter of pilot pulses to impulses of force for controlling mechanisms of textile machines, particularly dobbies, wherein an electromagnet is mounted on a carrier, which is arranged reciprocably movably ppposite an end part of a spring loaded force pin mounted on a holder opposite the carrier, a spring loaded barrier, which is connected with an armature of the electromagnet, being mounted on the carrier swingably facing the end of the spring loaded force pin.

2. An electromechanical converter as claimed in Claim 1, wherein the carrier is provided with at least one guiding pin for a compression spring, by means of which a roller, which is mounted on the carrier, is held in engagement with a driving cam for reciprocatory motion of the carrier.

3. An electromechanical converter as claimed in Claim 1 or 2, wherein on the carrier, a recess is made for the end part of the force pin, the spring loaded barrier on a wall of the carrier extending over its orifice, said wall being adapted as a support for the barrier.

4. An electromechanical converter as claimed in Claim 3, wherein the spring loaded barrier is mounted on the carrier by means of an open joint on a bracket, which is connected to a holder of the electromagnet on the carrier, said barrier being spring loaded on the side of the joint by a spring.

5. An electromechanical converter as claimed in Claim 4, wherein the spring loaded barrier is made of material with good sliding properties, and is detachably mounted in its middle part of the armature of the electromagnet.

6. An electromechanical converter as claimed in Claim 2, wherein the guiding pin is freely displaceable inside a guideway made on the holder, a compression spring being slid thereon, which bears with one end against the holder and with its other end against the carrier.

7. An electromechanical converter substantially as hereinbefore described with reference to the accompanying drawings.