CH635875A5 - Apparatus for controllable thread deflection in a machine for the production of sheet-like textiles - Google Patents

Description

The invention relates to a device according to the preamble of claim 1.

Devices of this type are required in particular for deflecting the warp threads for the formation of weaving sheds. When producing patterned fabrics, certain warp threads have to be redirected during the shedding. Warp threads to be deflected at the same time can be guided in a common shaft. The shed formation is controlled, for example, by a punch card scanned by needles. This needle can only transmit a small force during its movements, which is not sufficient to lift the shafts. Known weaving machines are therefore provided for each shaft with at least one lever which is pivoted back and forth during operation and serves as a drive element, namely with a so-called knife. Furthermore, there is a further pivotably mounted lever which serves as an output element and is connected to the shaft to be moved, for example via a cord or linkage. A hook is articulated on the lever serving as the output member. This is arranged so that it can be pivoted by a control element actuated by the needle from a position in which it does not engage the knife into a position in which it hooks on the knife. When the hook is in the latter position, it is carried along by the knife in one direction of movement, as a result of which the corresponding movement of the knife is transmitted to the drive lever and thus to the shaft.

So that the previously known devices work reliably and no excessive forces occur in the case of the hook surfaces resting on the knife, the hooks must have a relatively large, bent or angled part which can hook onto the knife. The hooks must therefore travel a relatively large distance in order to get from the position in which they are not hooking into the position in which they are hooking up. The same applies, of course, to the movement by which the hooks are moved out of the effective range of the knife. Furthermore, the hooks have a relatively large mass. Large forces are therefore required to accelerate the hooks, which limits the maximum possible shedding frequency.

Since the control element for adjusting the hook serving as driver must already exert a fairly large force, in the previously known machines between the needle and the control element acting on the lever there is often still a complex and space-consuming transmission device. Furthermore, a relatively large number of elements are required to convert the rotary movement of a drive shaft into a reciprocating movement of the knives.

The known devices for controlling the technical training not only have the disadvantage that they limit the maximum working speed to a relatively small value, but they are also relatively expensive.

A shaft control with a linkage and a joint is known from German publication 1 535 222. Depending on the position of a slide, a linkage bends or remains stretched during operation.

However, such a device has the disadvantages that it requires a relatively large amount of storage and guide means and that the linkage is correspondingly heavy, as a result of which the working speed is limited to a relatively low value. Furthermore, the manufacturing costs for such a device are relatively large and the device is subject to heavy wear during operation. Furthermore, the foldable linkage parts and the slide take up a relatively large amount of space, so that the 5th

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like devices can only be used for machines in which only a relatively small number of devices are required.

In the above-mentioned German publication 1 535 222 it is also stated that instead of a bendable linkage, telescopic rams could also be used. However, it is not disclosed in which way these telescopic plungers are to be controlled in such a way that they either effect a movement transmission or not.

Similar problems also arise in the control of knitting and knitting machines.

The invention has now set itself the task of creating a device of the type mentioned in the introduction, which makes it possible to avoid the disadvantages of the previously known devices. In particular, the highest possible working speed with low manufacturing costs should be achieved.

Starting from the prior art known from German Patent Specification 1,535,222, this object is achieved according to the invention by a device which is designed in accordance with claim 1. Appropriate embodiments of the invention result from the dependent claims.

The subject of the invention will now be explained with reference to exemplary embodiments shown in the drawing. The drawing shows:

1 shows a schematic longitudinal section through a weaving machine,

FIG. 2 shows an axonometric view of a transmission device for moving a shaft, the control plunger being in a position in which the shaft in question is not lifted when the subject is changed,

3 shows a view corresponding to FIG. 2, but with the control tappet in a position which triggers an elevation of the shaft in question,

4 shows a variant of the transmission device with a locking device in order to lock the output rod in the raised position,

5 shows the locking device shown in FIG. 4, but in the state in which it does not lock the driven rod,

FIG. 6 shows a variant of a transmission device with two oppositely acting control tappets,

FIG. 7 shows an axonometric view of a variant of a transmission device with two drive rods driven in opposite directions and a sleeve with two axial guide slots,

FIG. 8 shows an axonometric view of a variant of the device shown in FIG. 7, in which the sleeve has four axial guide slots,

FIG. 9 shows a schematic longitudinal view of two shed compartments which are formed by means of devices of the type shown in FIG. 8,

FIG. 10 shows a variant of a transmission device in which two sleeves are driven in opposite directions,

FIG. 11 shows a side view of another variant of a transmission device with two driven sleeves,

FIG. 12 shows a plan view of the device shown in FIG. 11, certain parts being omitted in FIGS. 11 and 12 to improve the overview, and the sleeves have been drawn with exaggeratedly large diameters for clarification, and FIG. 13 is a functional diagram to illustrate the mode of operation of the device 11 and 12 shown transmission device.

The weaving machine shown schematically in FIG. 1, which is, for example, a ribbon loom, has a frame 1, a warp beam 3, a shedding device 5 for deflecting the warp threads 7, a weft insertion needle 9, a reed 11 and a device 13 to pull off and wind up the goods. The shedding device 5 has at least two, for example three or more shafts 15, each with a frame and a plurality of strands with thread guide eyes. The movement of the shafts is controlled by a cam chain 17 which is guided over a roller 19. For each shaft 15 there is a control tappet 21 which scans the cam chain 17 and whose movement is transmitted to the associated shaft 15 by a transmission device 23. For simplification, only the transmission device 23 for a single shaft 15 is shown in FIG. A common for all transmission devices, rotatable, mounted in the frame 1 shaft 25 is rotated during operation via a drive wheel 27 at a constant speed. A cam plate 29 common to all transmission devices 23 sits on the shaft in a rotationally fixed manner.

The transmission device 23 is shown separately in FIGS. 2 and 3. It has a guide 31 fastened to the frame 1, in which a drive rod 33 is displaceably and non-rotatably guided along its straight displacement axis 35. The drive rod 33 is at one, lower end e.g. provided with a roller 37 which bears, for example, on the peripheral surface of the cam plate 29. At the other end, the rod 33 is provided with a thickening 33a. The rod 33 has a coaxial longitudinal opening 33b, which is provided with a circular cylindrical, coaxial extension 33c in the region of the thickening 33a. The thickening 33a is also provided with an L-shaped slot 33d, one section of which extends in the axial direction and extends to the rod end and the other section of which runs transversely to the rod axis. In the extension 33c, a coupling sleeve 39 is pivotally guided about the rod axis. The coupling sleeve 39 is connected to the drive rod 33 in an axially non-displaceable manner by a pin 41 which penetrates the section of the slot 33d which extends transversely to the rod axis. A spring 43 acts on the latter and on the pin 41, which presses the pin 41 against that end of the section of the slot 33d which extends transversely to the displacement axis 35 and which faces away from the axial slot section.

The sleeve 39 is provided with a longitudinal wing 39a projecting radially outwards. The control plunger 31 scanning the cam chain 17 is guided axially displaceably in a guide 45 fastened to the frame, the axis of the control plunger 21 being at right angles to the displacement axis 35, but not cutting it. However, the control tappet 21 is guided in such a way that its end facing away from the cam chain can engage on a side surface of the longitudinal wing 39a. Otherwise, the control tappet is provided with a head at its end facing the cam chain 17. Between this and the guide 45, a spring 47 is arranged, which presses the control tappet against the cam chain.

An output rod 49 is axially displaceably guided in the longitudinal opening 33b of the drive rod 33, the end 49a of the output rod 49 projecting from the output rod is connected to the associated shaft 15. The output rod 49 is by means not shown either in the drive rod 33 or outside of it against rotation about its longitudinal axis, i.e. secured around the shift axis 35. The output rod 49 is provided with a driver pin 51 projecting radially outwards. The coupling sleeve 39 is provided with a longitudinal slot 39b which is somewhat wider than that

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Pin 51 and a guide extending along the displacement axis 35 forms, along which the pin 51 is displaceable. The longitudinal slot 39b opens at its upper end facing away from the drive rod 33 into an extension 39c which is formed by an incision made from the upper sleeve edge. The one side flank of this extension 39c is flush with the one side flank of the slot 39b.

The control of the shaft movement will now be explained below. When the weaving machine is in operation, the shaft 25 and the cam disk 29 sitting thereon rotate. The roller 37 is pressed against the cam disk 29 by the weight of the rods 33 and 49 and any spring that may still be present. The drive rod 33 and the axially non-displaceably connected coupling sleeve 39 are therefore periodically pushed back and forth along the displacement axis 35. When the control tappet 21 assumes the rest position shown in FIG. 2, the sleeve 39 is in a rotational end position in which the slot 39b is below the driver pin 51. If the cam plate 25 is now rotated further from the position shown, the drive rod 33 and the coupling sleeve are shifted upward, the driver pin 51 entering the slot 39b. The coupling sleeve thus slides upward along the driving pin 51 without being carried along. The output rod 49 and the shaft attached to it remain under the influence of their own weight and any spring that may still be present in their lower sliding end position, which can be determined by a stop (not shown). This lower end position is shown in FIG. 1 for the shaft located on the left and on the right outside.

The drives of the cam disk 25 and the cam chain 17 are coordinated with one another in such a way that the control tappet 21 is pressed against the longitudinal wing 39a by an existing cam just when the drive rod 33 is in its lowest position. The control plunger 21 then rotates the coupling sleeve 39 about the displacement axis 35, as shown in FIG. 3. The sleeve is rotated into its other rotational end position, so that the side flank of the extension 39c facing away from the slot 39b reaches the driving pin 51. So that the sleeve 39 can be rotated in the unloaded state and the plunger only has to exert a slight force, the extension is in the lower sliding end positions of the drive and driven rod between the pin 51 and the boundary surface extending transversely to the displacement axis 35 39c some play. If the cam disc 29 now rotates further and the drive rod 31 and the coupling sleeve 39 are displaced upward, the boundary surface of the extension 39c extending transversely to the displacement axis 35 engages the driving pin 51. This and the output rod 49 are now positively carried by the coupling sleeve. As a result, the shaft 15 fastened to the relevant output rod 49 is shifted into its upper sliding end position, as is shown in FIG. 1 for the middle shaft.

When the cam 25 continues to rotate, the drive shaft and the coupling sleeve 39 move down again. The output rod 49 and the shaft attached to it follow this movement under the influence of their own weight and the mentioned spring, which may still be present. The cam chain and the control plunger 21 are designed such that the latter releases the sleeve 39 again when the rods 35 and 49 come close to their lower end position. The spring 43 then rotates the coupling sleeve 39 back into its starting position.

According to the arrangement of the cams on the cam chain 17, each rotation of the shaft 25 can

optionally one or more shafts 15 are lifted according to a program, so that the warp threads are divided into two layers and form a shed. A weft loop can then be inserted into this by means of the weft insertion needle 9. A patterned fabric can be produced by using warp threads of different colors.

The force required to lift the shafts 15 is applied by the cam plate 29 and transmitted from the drive rod 33 via the coupling sleeve 39 to the output rod 49. In order for the coupling sleeve 39 to take the output rod with it, the control tappet 21 only has to exert the force which is required to pivot or twist the coupling sleeve 39 by a certain angle of rotation. The coupling sleeve 39 can easily be produced in such a way that it has only a low mass, so that only small acceleration forces are required to twist it. The springs 43 and 47 then also only need to generate small restoring forces and the friction of the coupling sleeve can be kept small by suitable surface formation and lubrication. The specialist training can therefore take place at a high frequency.

The output rod 49_ can, as described, be fastened to a shaft which guides several warp threads. The upper end of the output rod can, however, also be designed as an eye for guiding a single warp thread. In this case, of course, a control tappet, a drive and an output rod and a coupling sleeve are required for each warp thread.

In the variants shown in FIGS. 4 and 5, the output rod 149 is provided with a cam 149b. A spring-loaded locking plunger 162 is guided transversely to the axis of the output rod in a guide 161 fastened to the machine frame. If the output rod 149, which apart from the cam 149b is of the same design as the output rod 49, is in its upper sliding end position, the locking plunger 162 can be pressed against the output rod 149 by a cam of the cam chain . In this position shown in FIG. 4, the locking plunger holds the output rod in its upper end position for a predetermined period of time, which can extend, for example, over a few revolutions of the cam disk 29. The end of the control tappet engaging cam 149b can be conical or the cam surface on the control tappet can be chamfered and a small engagement clearance can be provided. When the cam of the cam chain releases the locking plunger 162 again, the latter arrives in the position shown in FIG. 5, in which it disengages from the driven rod.

6 shows a coupling sleeve 239 with a wing 239a and an axial slot 239b and an output rod 249 with a driver cam 251. The latter is currently in the area of slot 239b. Furthermore, there are two adjustable, spring-loaded control plungers 221 which can be moved by the cam chain and which engage on the wing 239a and can rotate the coupling sleeve 239 in opposite directions. There is no return spring corresponding to spring 43 in the embodiment shown in FIG. 6. If the coupling sleeve 239 is rotated with one of the control plungers 221, it remains in its new position until it is rotated back by the other plunger. Otherwise, the variant shown in FIG. 6 works similarly to that shown in FIGS. 2 and 3.

The highly schematic variant shown in FIG. 7 has two swivel arms 329 which are swiveled back and forth during operation. Each of the two

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Swivel arms engage a drive rod 333. The two drive rods 333 can be axially displaceable and non-rotatably guided in the frame of the loom by guides, not shown. The two drive rods 333 are provided at their mutually facing ends with a driver pin 351 and additionally with a driver pin 353, the four pins being arranged on a straight line parallel to the rod axis. A coupling sleeve 339 is slidably and rotatably guided on the two drive rods 333. The coupling sleeve 339 has a wing 339a, so that it can be rotated about the common longitudinal axis of the drive rods and the sleeve by means of a control tappet 321 which is displaceably guided by a guide (not shown). The turning back can take place either by means of a return spring or by means of a second control plunger. The sleeve 339 has two slots 339b which run along its longitudinal axis but are offset with respect to one another on the sleeve circumference and open into an extension 339c in the central part of the sleeve from different sides. The two side boundary surfaces of the extension are aligned with the side surface of one of the two slots. The two slots 339b are dimensioned such that they form guides for the driver pins 351.353. The coupling sleeve 339 also forms the output member of the transmission device and is provided with a thread guide 315 for guiding a warp thread 307. The thread guide 315 is only shown schematically and, in reality, is advantageously designed such that the sleeve does not have to be passed through the shed. Instead of a thread guide for a single thread, an entire shaft can also be connected to the sleeve, analogously to how it is explained with reference to FIG. 8.

In operation, the two drive rods 333 are periodically pushed back and forth along their longitudinal axes, always in opposite directions. In the position shown, the warp thread 307 is in its central position. Furthermore, the two pins 351 are located in the extension 339c and the two pins 353 just above or below the sleeve 339. When the sleeve has been rotated by the control tappet 321 into the position shown and the two drive rods are displaced away from one another , the driver pin 351 of the upper drive rod 333 can slide up along the upper slot 339b. In contrast, the driver pin 351 of the lower drive rod engages on the lower boundary surface of the extension 339c, which extends transversely to the direction of displacement of the drive rods, and pulls the sleeve downward, thereby causing the warp thread to be deflected downward. If the two drive rods are moved against each other again, the sleeve can also be moved upwards again into its drawn, middle sliding position by the lowest pin 353 or by a return spring provided instead.

If the sleeve maintains its end-of-rotation position, it will be moved downwards again from its drawn position during the next displacement cycle of the drive rods. If, on the other hand, the control plunger 323 is withdrawn and the sleeve 339 is pivoted into its other rotational end position under the action of a return spring or another control plunger, the sleeve is carried upwards and the warp thread 307 is deflected upwards accordingly. The sleeve then returns to its middle sliding position.

It should also be noted that the two axial slots 339b could of course open into a separate extension instead of into a common one. However, the extensions must be arranged in such a way that the sleeve is carried by one drive rod in its one end of rotation position and in the other end of rotation position by the other drive rod.

Like the variant shown in FIG. 7, the transmission device shown in FIG. 8 has two drive rods 433, which are aligned with one another, cannot be rotated and are axially displaceable and are periodically shifted in opposite directions during operation. The two drive rods are each provided with a driver pin 451 at their mutually facing ends. The coupling sleeve 439, which is displaceably and rotatably guided on the two drive rods 433, has at least one non-visible wing, so that it can optionally be rotated into one of three rotary positions by one or more control tappets. Furthermore, a return spring acting on the coupling sleeve can also be present. The sleeve has two axial slots 439a and 439b at the top and two axial slots 439c and 439d at the bottom. The four slots open into a common extension 439e in the middle part of the sleeve. The slots are arranged in such a way that the sleeve, when it is in the drawn middle rotational position and middle sliding position, is not carried by either of the two drive rods. The driver pins of both drive rods then slide along the slots 439b and 439d. If, on the other hand, the sleeve is rotated into one of its two rotary end positions when it is in its central slide position, it is carried by one or the other drive rod. The sleeve 439 is provided with two laterally projecting tabs. Two rods 461 arranged symmetrically to the drive rods 433 are fastened or supported on these. These two rods 461 transmit the displacement movement of the coupling sleeve to the associated shaft. The rods 461 must of course engage the coupling sleeve and the shaft in such a way that they do not hinder the rotational movement of the coupling sleeve, but do transmit the displacement movement in a form-fitting manner. Instead of the rods 461, however, a traction cable could also be provided, in which case a spring acting on the shaft can then ensure that the traction cable is always stretched. However, one could also provide two pulling ropes that engage the shaft in opposite pulling directions. The coupling sleeve 439 thus forms the output member of the transmission device.

Since the coupling sleeve 439 can optionally be rotated into one of three rotary positions, it is possible, for example, to provide a cam chain with cams of different heights, so that the coupling sleeve, starting from a rotary end position, counteracts the torque generated by a return spring depending on the Cam height is turned to the middle rotary position or to the other rotary end position. However, one can also provide two or even three control tappets that scan different rows of cams of the cam chain, so that the coupling sleeve moves into one or the other rotary position depending on the control tappet currently acting on it.

The transmission device shown in FIG. 8 can be used for weaving machines in which two weaving compartments have to be formed in part of the shed formation. This is shown schematically in FIG. 9, in which warp threads 407 and shafts 415 can be seen. Such double compartments are required in particular in the production of knobbed fabrics. For this purpose, reference is made, for example, to the Swiss patent specification 587 940 and the corresponding US patent specification 4,039,008. The shafts 415 are therefore brought into one of three possible positions during shed formation. For example, springs acting on the shafts 415 and / or on the coupling sleeves 439 can be provided, which springs the shafts and coupling

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Pull the sleeves against their middle sliding position. It is thereby achieved that a coupling sleeve 439 located in its central rotational position and the shaft 415 connected to it actually remain in their central sliding position when the drive rods 433 are displaced. You can also provide a locking device for each shaft, which holds the shaft and the coupling sleeve in its central sliding position, for example by means of a spring-loaded ball engaging in a recess, such that the coupling sleeve only then out of its central sliding Position is shifted when one of the driver pins really engages one of the boundary surfaces of the extension 439e, which is transverse to the direction of displacement. For the rest, controllable locking devices can be provided, analogous to the one shown in FIGS. 4 and 5, in order to hold the sleeve in a certain sliding position during several compartment configurations.

The transmission device shown in FIG. 10 has an output rod 549 which is axially displaceable and non-rotatable in the frame of the weaving machine, which has two radially outwardly projecting driver pins 551 and is connected at one end to a shaft or provided with a thread guide . On the output rod 549, two coupling sleeves 539 are axially displaceable and rotatable. Each coupling sleeve is provided with a radially projecting collar 539a and an axial slot 539b. The two slots 539b open at their ends facing away from one another in a one-sided extension 539c formed by a transverse slot, the two extensions extending on different sides. A fork-shaped drive swivel arm 529, which is pivotably mounted in the frame of the weaving machine, engages on the collar 539a of each sleeve 539. The two swivel arms are provided with toothed circular sectors arranged coaxially with their swivel bearings. The latter mesh with one another so that the two swivel arms 529 are connected to one another in a rotationally fixed manner and always perform opposite swivel movements during operation. One of the two swivel arms 529 is connected via a link 527 to a crank disc 525 which is rotatably mounted in the frame and which rotates continuously during operation.

The two coupling sleeves are each provided with a wing that cannot be seen, on which a control tappet (not shown) can engage in order to move the coupling sleeves against the torque generated by a return spring (not shown) from one end of rotation position to the other end of rotation position to twist. In one end of rotation position, the driver pins 551 protrude into the axial slots 539b or lie in the axial extension of these slots. In the other end of rotation position, the driver pins 551 are located laterally next to the axial slots 539b in the extensions 539c, so that they can act on their boundary surfaces running transversely to the direction of displacement. Springs engaging the output rod or the shaft connected thereto pull these against a central sliding position in which the warp threads run in a straight line, as can be seen in FIG. If both coupling sleeves 539 are in end positions in which the driver pins 551 can slide along the axial slots 539b, the output rod remains in its middle sliding position. If, on the other hand, the upper coupling sleeve is in the rotational end position shown in FIG. 10, it engages the upper driver pin 551 during both the upward and the downward movement. The output rod 549 is then shifted from its middle sliding position first upwards into its upper sliding end position and then again into its middle sliding position,

the upper coupling sleeve 539 positively transmits both the upward and the downward movement to the output rod. If the output rod is in its middle sliding position, the two coupling sleeves can be rotated from their drawn rotary end positions to their other rotary end positions. The driven rod 549 is then shifted from its middle position from the lower coupling sleeve first downward and then upward again.

In the device shown in FIGS. 11 and 12 there is an output rod 649 which has two driver pins 551 and is guided axially displaceably and non-rotatably in two guides 653 rigidly attached to the frame, only one of which can be seen. One end of the output rod is connected to a shaft or provided with a thread guide. On the output rod 649, two coupling sleeves 639 are slidably and separately rotatable. Each sleeve has a radially projecting pin or cam 639a and two axial slots 639b which are connected in the middle to a transverse slot forming an extension 639c. The axially parallel slots 639b and the extension 639c together form an H. Each sleeve 639 also has a cam 639d. This can engage in one of three guide grooves of a guide 641 running parallel to the output rod 649, which guide is rigidly attached to the frame and is only shown in FIG. The cams 639d and the guide 641 ensure that the sleeves can only be rotated when they are in one of their sliding end positions. As will be explained further, the cam 639d and the guide 641 further ensure that a sleeve can only be rotated by certain angles of rotation depending on the sliding end position and the rotational position in which it is located. A return spring 643 also acts on each coupling sleeve 639 and exerts a torque on the coupling sleeve in order to rotate the coupling sleeve against its one end of rotation position. Furthermore, a spring-loaded control tappet 621 is available. This is slidably guided in the frame such that its axis lies in the center plane between the two coupling sleeves 639. There is also a rocker rod 623 on which the plunger 621 engages via a compression spring 619. The rocker rod 623 is held in the frame by holding means, not shown, in such a way that it bears against the cams 639a of the two coupling sleeves 639 and can be displaced transversely to the output rod 649 by the plunger. The rocker rod is held so that it can also be tilted a little along a plane that runs parallel to the axes of the output rod 649 and the plunger 621.

Furthermore, not yet shown locking devices are available to lock the output rod 649 in three different sliding positions. The coupling sleeves are operatively connected to the locking devices so that the latter can hold or release the output rod by rotating the coupling sleeves.

For each sleeve 639b there is a crank disk 625 rotatably mounted in the frame and a pair of drive levers 627. One end of the latter is supported on the frame of the weaving machine. The other ends of the drive levers are eccentrically connected to the crank disks 625. The pivot axes of the levers 627 run at right angles to the warp threads or more precisely, at right angles to the planes along which the warp threads move when the shed is changed. The levers 627 engage between their two ends on pins 629 which are fastened to diametrically opposed locations on the sleeves 639.

In Figure 13, the two coupling

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Sleeves 639, the output rod 649 and the driver pins 651 shown at different times.

At time t.l, the two sleeves 639 are in the sliding position in which they are closest to each other. Furthermore, the two sleeves are in the rotational end position which they assume in the rest position of the plunger 621, i.e. if it does not exert any force on the cams 639a. This rotary end position is designated R. 1 in the drawing. At time 1.1, the upper driver pin is located at the height of the transverse slot 639c in the left slot 639b of the upper sleeve. The lower driver pin 651 penetrates the lower part of the left slot 639b of the lower sleeve. In these sleeve positions, the output shaft is locked by the locking devices. If the sleeves move away from one another in the direction of the arrows during the following half turn of the crank disks 625, none of the sleeves take the output rod with them.

It therefore remains in its lowermost sliding position, labeled p. 1.

At time t.2, the two sleeves reach their sliding end position in which they are furthest apart. The sleeves remain in their rotational end positions R.I. During the next half turn, the two sleeves move in the direction of the arrows against one another, the output rod still remaining in the sliding end position S. 1.

The two sleeves then return to their sliding positions at time t.3, in which they are closest to each other. If the plunger 621 is now displaced and the rocker rod 623 presses against the cams 639a, the upper sleeve is rotated counter to the force exerted on it by the return spring 643. The lower sleeve, on the other hand, cannot be rotated because it is held non-rotatably by the lower driver pin. Otherwise, the cam 639d and the guide 641 are designed such that the cam 639d, when the upper sleeve is in the specified sliding end position, only extends from the groove of the guide 641 located at the rear in FIG. 12 into the central groove can be brought. Accordingly, the driver pin 651 reaches the transverse slot 639c in the rotational position R.2 of the upper sleeve. The output rod 649 is now carried along by the upper sleeve, which moves upwards during the next half turn of the crank disk 625, and is moved into the upper sliding end position S.2.

However, the output rod can also be shifted upwards during the half turn of the crank disk immediately following time t.2.

If this is to be done, the lower sleeve is rotated by means of the control plunger at time t.2, so that it reaches the rotary position R.2, in which the lower driver pin reaches the transverse slot 639c. The guide 641 is designed in such a way that the lower sleeve in the sliding end position shown at time t.2 can only be rotated into the rotational position R.2 and not further. The output rod is then moved upward by the lower sleeve, as shown in Figure 13 for the time t.4. The output rod then also comes into its upper sliding end position.

When the output rod has reached its upper sliding end position, the sleeves can maintain their rotating position. In this case, the output rod is moved down again the next half turn of the crank disc.

When the output rod has reached its upper sliding end position, however, the control tappet can in turn exert a compressive force on the rocker rod 623.

The sleeve that has taken the output rod upwards is then rotated into its rotational end position R.3. For example, if you start from the positions of the sleeves and the output rod shown for the time t.4, the lower sleeve, when it and the rod have reached their upper sliding end positions, can be rotated into the rotational end position R.3 . This is shown in FIG. 13 for the time t.5. The output rod then remains in its upper sliding end position S.2.

The next time the upper sleeve reaches its upper sliding end position, it can also be turned into the rotational end position R.3, as shown for time t.6. The output rod then still remains in its upper sliding end position S.2.

As already mentioned, the sleeves are operatively connected to locking devices through which the output rod can be locked in its two sliding end positions. The latching devices and their connections to the sleeves are such that the output rod, when both sleeves are in their rotational positions R.3, remains in its upper end position S.2 even when the control plunger 621 is retracted and no more torque is exerted on the sleeves. Likewise, the locking devices then hold the sleeves in their rotational positions R.3.

If the output rod is now to be moved downward again, the locking device holding the output rod in its position S.2 and the locking device holding the sleeves in their rotational position R.3 are first released. For this purpose, a short pressure is exerted on the rocker bar by the control tappet and transferred to the sleeves, which causes the disengagement. If the control tappet moves back under the action of a spring engaging on it and the two sleeves are in one of their sliding end positions, the sleeve that is in their upper sliding end position becomes under the action of the return spring engaging on them 643 rotated back to its rotary end position R.2. The guide 641 ensures that the sleeve in question is not immediately rotated back into its original rotational end position R. 1. In FIG. 13, for the time t.7, the case is shown that the lower sleeve has been rotated back into the rotary position R.2 in its upper sliding end position and entrains the output rod downward. In the case shown for the time t.8, the upper sleeve, when it was in its upper end position, was previously rotated back into its rotary position R.2.

If the sleeve, which also transported the rod downwards, is held in its rotary position R.2 by means of the plunger, it takes the output rod upwards again on its next upward stroke. Otherwise, both sleeves successively return to their turning end position R.L. In this case, one of the locking devices mentioned engages and holds the output rod in its lower sliding end position S. 1 until the cycle starts again.

During operation of the device shown in FIGS. 12 and 13, the output rod is positively entrained by one of the two sleeves when the sleeves are in the corresponding rotational position both in the upward and in the downward displacements. Accordingly, this also applies to the shaft, which is positively connected to the output rod. It should also be noted that the devices shown in FIGS. 11 and 12 are intended for a shaft control according to the so-called double-stroke open compartment principle.

Now a few more variants are to be discussed. First of all, it should be mentioned that the various previously discussed designs are in some ways s

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can be combined with each other. Furthermore, the rotation of the coupling sleeve could also be controlled by a perforated band instead of by a cam chain, it then being possible to provide separate scanning elements which actuate the control plungers. However, one could also provide a magnetic tape or some electronic memory as a program carrier and actuate the control tappets by means of electromagnets. Pneumatic or hydraulic actuation of the plunger would also be possible. Otherwise, a weaving machine could be provided which is both non-controllable, i.e. periodically shifted shafts as well as at least one controllable shaft. Furthermore, one could of course provide other control elements, for example levers, for rotating the coupling sleeves instead of the control tappets.

In the exemplary embodiments described, the rotatable sleeves have at least one axial slot, along which a pin or cam of the rod that can be coupled to the sleeve can slide if no coupling is to take place. One could now easily provide the sleeve with an inwardly projecting pin or cam, which could then slide along a groove in the rod in the state in which no entrainment takes place.

As can be seen from the exemplary embodiments shown in the figures, the coupling sleeve can either form the drive element or the output element or can be connected to these elements in an axially displaceable manner. Otherwise, the sleeve could also be guided non-rotatably and instead of the sleeve, the rod having the driver pin or cam could be rotated for coupling and uncoupling, so that the rod would form the rotatable coupling element. In all cases, however, the coupling element should be of such a nature that it can be rotated about a displacement axis along which the displacement movement to be transmitted takes place. At least two rotary positions should be possible, so that the sliding movement in one rotary position is positively transmitted from the drive element to the output element in at least one direction, while the displacement movement does not transmit the other rotary position becomes.

Finally, it should also be mentioned that the device described can not only be used for controlling the shed formations of weaving machines, but can also be adapted for other controlled thread deflections in machines for the production of flat textiles.

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3 sheets of drawings

Claims (8)

635875 1. Device for the controllable thread deflection in a machine for the production of flat textiles, with at least one drive element (33, 333, 433, 539, 639) determined during operation for carrying out a periodic back and forth movement, at least one driven element provided or connectable with a thread deflection element (15, 315, 415) Organ (49,149,249,339,439,549,649), at least one control element (21,221,321,621) and at least one coupling element (39,239,339,439,539,639) which can be adjusted by the control element (21,221,321,621) in such a way that the output element (49,149,249,339,439, 549,649) is driven (33,333,433,539,639) is positively carried in one position in one direction of movement and is not carried in another position, the drive element (33,333,433,539, 639) and the output element (49,149,249,339,439,549, 649) being in the state in which no movement takes place , along a common displacement axis (35) with respect to each other can be cut, characterized in that the coupling element (39,239,339,439,539,639) can be rotated by the control element (21,221,321,621) with respect to one of these two organs about the displacement axis (35), so that it is disengaged and in a rotational position another rotational position in entrainment engagement with this organ (49,249,339,549,649). 2. Device according to claim 1, characterized in that the coupling element is designed as a sleeve (39,239,339,439, 539,639) which is rotatable about the member (49,249,333,433, 549,649) with which it can be brought into engagement, and which in two rotational positions is axially immovably connected to the other member (33) or forms it. 2nd PATENT CLAIMS 3. Device according to one of claims 1 or 2, characterized in that one of the parts which can be brought into engagement with one another has a projecting driver (51,251,351,451,551,651) and the other a guide (39b, 239b, 339b) running parallel to the displacement axis (35) , 439a, 439b, 439c, 439d) along which the driver (51, 251, 351, 451, 551) can be displaced when the parts that can be brought into engagement are disengaged. 4. Device according to claims 2 and 3, characterized in that the guide is formed by a slot (39b, 239b, 339b, 439a, 439b, 439c, 439d) present in the sleeve (39,239,339,439,539,639). 5. Device according to one of claims 3 or 4, characterized in that one of the parts which can be brought into engagement with one another * has two guides (439a, 439b, 439c, 439d, 639b) which run parallel to the displacement axis and that the driver (451,651 ) is displaceable in one rotational position along one and in another rotational position along the other guide. 6. Device according to one of claims 1 to 5, characterized in that a return spring (43,643) acts on the coupling element (39,639) and generates a torque pushing the coupling element (39,639) against a rotational end position. 7. Device according to one of claims 1 to 6, characterized in that the control member is a plunger (21,321, 621) which is displaceable transversely to the displacement axis (35). 8. Device according to one of claims 1 to 7, characterized in that two drive elements (333, 539, 639) are provided which are connected to drive means in such a way that they are displaced in opposite directions during operation, and in that the output element (339, 439 , 549,649) can optionally be brought into connection with one of the two drive elements (333,433,539,639).