EP0047791B1 - Coupling system for operating the heald frames in a loom - Google Patents

Description

The invention relates to a coupling arrangement for controlling the shafts of a weaving machine, with an intermittently rotating drive shaft having at least one groove and a pawl which can be coupled into the groove and is arranged on a cam rotatably mounted on the drive shaft, and with a tab of a crank rod which surrounds the cam for the drive to the shafts and at least one control lever which is movable in the path of the pawl and disengages them and which can be pivoted back and forth by a circuit board which can be coupled into a lifting knife drive.

In a known arrangement of this type (DE-AS-27 41 199) the spring-loaded board is pivoted against the spring action by a drive rod, after which it is moved back under the action of the spring. During this back and forth movement, it may or may not be coupled with a lifting knife, depending on whether it is released by the armature of an associated electromagnet or not. The clutch arrangement is relatively complicated and requires several springs. The drive parts come unsprung onto the circuit board to be coupled with the lifting knife or to be locked by the armature.

The invention has for its object to provide a particularly improved arrangement in this regard.

The invention consists in a reciprocating movement of a drive, on the one hand connected to the circuit board and on the other hand to a program control device, which carries two pivotable levers which are pulled by a spring against a central stop and between which a driver part of the drive projects. The lifting part can be used in a sensible manner for the sprung drive of the board and on the other hand for sprung scanning of the position of the program control device. It is possible to get by with only a single spring, which means that the circuit board can be held in the non-positive coupling position with the lifting knife and the lifting part can be held in the non-positive scanning position on the program control device. The frictional connection begins under low pressure, which is automatically increased by the spring moved with the lifting part. The parts can thus be brought into the operative position with particular care and can be held resiliently in this operative position. You can also get by with very few parts.

• Fig. 1 ist ein Schnitt durch eine erfindungsgemäss ausgebildete Kupplungsanordnung zur Steuerung von Webschäften einer Webmaschine,
• Fig. 2 und 3 erläutern andere Positionen der Teile.

Further features result from the following description of exemplary embodiments in conjunction with the drawing and the claims.

• 1 is a section through a coupling arrangement designed according to the invention for controlling heald frames of a weaving machine,
• 2 and 3 illustrate other positions of the parts.

A drive shaft 1, which is set in rotation by 180 ° from the main shaft of the weaving machine in each case, contains two grooves 2, into which the nose 3 of a coupling pawl 5 pivotably mounted at 4 and acting under the action of a tension spring 60 can engage. The pawl 5 is mounted on an eccentric 6 rotatably mounted on shaft 1, which is enclosed by a tab or rocker 7. This is articulated at 8 on a transmission linkage 9, via which the back and forth movement of the tab 7, which arises according to arrow 11, is transmitted to an associated shaft of a weaving machine. There are a whole number on wave 1, e.g. Six to twelve of the drive parts 6, 7 shown in Fig. 1 arranged, namely an eccentric 6 and a tab 7 for each shaft of the loom. The entire parts 1, 6, 7 form the so-called eccentric machine for driving and controlling all the heald frames of the loom. The shafts are moved in a high or low position according to a binding program for the warp threads.

To actuate the pawl 5 during operation, two control levers 14, 15 and 16, 17 pivotally mounted on the fixed bearing journals 12, 13 are installed, which have hooks 18 at the free ends, which can be pivoted into the path of the pawl 5. The two control levers are connected to the arms 15, 17 at 21 by a joint.

On the arm 15 a plate 23 is pivotally mounted at 22, which can be coupled with a reciprocating knife 25 moved back and forth according to arrow 24.

The board 23 has a fork-shaped part 26 which forms a slot 27. The pin 28 of an arm 31 of a three-armed lifting element 31, 32, 33 engages in this. The lifting element can be moved up and down according to arrow 34 in FIG. 1. The arm 32 carries at 35, 36 pivotally mounted, by a so-called center spring tension spring 37 held together, forming a slot 38 lever (overload lever) 41, 42. The arm 32 of the lifting element carries a pin 44, which in the slot 38 between the Lever 41, 42 protrudes. Finally, a pin 45 protrudes into the slot 38, which is attached to a drive lever 48 which can be pivoted back and forth according to arrow 46 by 47. The lever 48 executes a full up and down stroke during operation, while the shaft 1 only rotates by 180 ° (double stroke method).

The program control device for engaging and disengaging the pawl 5 is controlled by a stationary electromagnet 51 is formed, which is able to attract an armature 53 which can be pivoted by 52. The armature 53 works with the probe arm 33 of the lifting element 31 to 33.

The pivoting movement of the control levers 14 to 17 is limited by a fixed stop 54, since the arm 17 can strike the stop under the action of the tension spring 55.

The mode of action is as follows. If the heald frame belonging to the shown rocker 7 is to be moved alternately up and down during weaving operation, the pawl 5 must remain engaged in the drive shaft 1, as shown in FIG. 1. For this purpose, the control levers 14 to 17 must be in the ineffective position shown in FIG. 1 when the pawl 5 runs with its free end 61 under one of the hooks 18 of the control levers.

During the downward movement of the drive lever 48, the pin 45 strikes the lower overload lever 42 in FIG. 1. First of all, the lifting part 31 to 33 is thereby moved downward in FIG. 1 at the smallest distance (narrowest position) of the two overload levers 41, 42. The plate 23 is also pivoted downwards by the downward-moving pin 28, so that it is coupled in with the lifting knife 25. In the last phase of the downward movement of the drive lever 48, the tension of the spring 37 is increased somewhat by pivoting the lever 42 downward. It is thereby achieved that the circuit board 23 abuts the lifting knife 25 in a force-locking manner, namely under the action of the spring 37.

Each time the end 61 of the pawl 5 passes under one of the hooks 18, the lifting knife 25 and the board 23 are in the position shown in FIG. 1, in which the arms 15, 17 of the control lever in FIG. 1 move to the right and the hooks 18 are pivoted into the ineffective position shown in FIG. 1.

The fact that at the end of the downward stroke of the drive lever 48 the spring 37 is tensioned a little further, it can be achieved that the stroke of the lever 48 does not have to be exactly matched to the stroke movement of the stroke element 31 to 33. Lever 48 performs a certain overstroke.

If, as assumed, the heald frame driven by the rocker 7 is to continue alternately in the up and down position, the armature 53 must not be attracted by the electromagnet 51, but must be in the pivoted-out blocking position shown in FIGS. 1 and 2 ( Effective position) remain. The magnet 51 receives no current from the associated voltage source, it remains unexcited.

The parts 25, 23 are then moved to the left until the arm 17 hits the stop 54 and the lifting knife 25 reaches the left reverse position, in which it lifts off the shoulder 70 of the board 23. The drive lever 48 is then pivoted upward in FIG. 1. Pin 45 comes into contact with lever 41, lever 42 following it under the action of the relaxing spring 37. The levers 41, 42 are in the closest distance position. If the pin 45 is moved further upward, both levers 41, 42 and the lifting part 31 to 33 follow first at the smallest distance. However, the arm 33 immediately moves into the blocking position 33a shown in FIG. 2, in which the shoulder 33b abuts the armature 53. Upon further upward movement, the pin 45 is pressed against the lever 41 so that it is pivoted into the upper position shown in FIG. 2. The spring 37 stretches so that the distance between the levers 41, 42 is increased. The force generated by the drive lever 48 is directed in the position according to FIG. 2 via the spring 37 to the lower lever 42, which transmits the force via the pin 44 to the lifting part 32, so that the latter is shown in FIG. 2 under spring action Locked position and thus the arm 33 is held in a resilient, non-positive contact on the armature 53.

The lifting knife 25 returns to the right position shown in FIG. 2, which corresponds to the position according to FIG. 1. The control levers 14 to 17 are thus in turn in the pivoted, ineffective position, pawl 5 remains engaged.

If a heald frame is to remain in its high position or in its low position that it has reached, the associated pawl 5 must be disengaged. This is done as follows.

The lifting knife 25 runs from the right position shown in FIG. 1 to the left to its left reversing position, in which there is 23 clearance between the lifting knife and the offset 63 of the circuit board. The board 23 is also moved to the left until the movement is limited by the two control levers 14, 15 and 16, 17 at the stop 54. These levers are now in the operative position 14a, 15a or 16a, 17a shown in FIG. 3. At the same time, the electromagnet 51 is energized so that the armature 53 is pivoted into the left, ineffective position 53a shown in FIG. 3.

During the subsequent upward movement of the drive lever 48, the lifting part 31 to 33 is moved into the upper position according to FIG. 3 while keeping the smallest distance of the levers 41, 42. Arm 33 now has the position 33b, which is made possible by the ineffective position 53a of the armature 53 and in which the arm 33 stands next to the armature 53. During the upward movement of the lifting part 31 to 33, the movement generated by the lever 48 or the driving force is directed via the pin 45 onto the lever 41, from which the force becomes effect directed via the spring 37 to the dragged lever 42, which in turn moves the lifting part 31-33 upwards via the driving pin 44.

At the same time, the pin 28 is moved upwards. The board 23 thereby moves into the upper, ineffective position 23a according to FIG. 3, in which it is out of engagement with the lifting knife 25 and is located with play on a stop 65 with the nose 72. This forms a limitation for the movement of the board 23 upwards. In addition, together with the nose 72, it forms a safeguard that the control levers 14 to 17 cannot be inadvertently pivoted out of the locked position according to FIG. 3.

When the drive shaft 1 rotates according to arrow 66, the engaged pawl 5 runs with its end 61 onto the hook 18 of the pivoted-in control lever 16, 17 according to FIG. 3. Thereby pawl 5 is pivoted into the disengaging position 5a shown in FIG Tooth 3 is outside the groove 2. The associated heald frame, together with the pawl 5, thus remains in the last held high or low position.

During the subsequent downward movement of the parts 48, 31 to 33, 23, the board 23 temporarily comes into the effective range of the lifting knife 25, but is then immediately lifted back into the disengaging position 23a according to FIG. 3 moved back. The lifting knife is thus unable to move the board 23 in FIG. 3 to the right and to move the control levers 14 to 17 into an ineffective position. Jack 5 and the associated heald shaft remain in the previous rest position.

If the heald frame is to be moved into another position, the electromagnet 51 is de-energized, so that the next time the parts 48, 31 to 33, 23 move downward, the armature 53 is moved into the blocking position according to FIG. 1 under the action of a spring 69 . With the next upward movement of the lever 48, the process described above in FIGS. 1 and 2 occurs again. Arm 33 arrives in the blocking position 33a according to FIG. 2, circuit board 23 remains in the coupling position and is moved to the right again by the lifting knife 25, so that the control levers 14 to 17 are pivoted out into the ineffective position according to FIGS. 1, 2. Under the action of the spring 60 pawl 5 again in the coupling position shown in FIG. 1, so that it can be taken again by the drive shaft 1. As a result, the associated heald frame is set in motion again and moves to the other specialist position.

The spring 37 ensures that the parts 41, 42, 31 to 33 are taken along by the pin 45 during upward and downward movement, keeping the smallest distance between the levers 41, 42, as long as there is no obstacle in their path of movement. There is a constant readiness to over-tension the spring 37 as soon as the upward or downward movement of the parts is blocked or limited, for example by the armature 53 or the lifting knife 35. One and the same spring 37 is used for frictional entrainment when the parts move up and down. A particularly safe mode of operation is thus achieved with a minimal outlay on parts. It is particularly important that spring 37 is not attached to a fixed part of the area, but is moved together with the lifting part 31 to 33 while being attached to the two levers 41, 42.

The arrangement enables the control parts 31 to 33, 37, 23 to be moved to have a relatively small mass due to the relatively small number of these control parts, so that the control movements can take place with particularly high acceleration. This is advantageous in order to achieve high machine speeds. In addition, when the pawl 5 is disengaged, the relatively high force of the spring 60 holding the parts 1, 5 in the coupling position need not be overcome by movements and forces on the part of the control parts 31 to 33, 37, 23. These control parts only have a selection function.

Claims (2)

1. Clutch arrangement for controlling the heddles of a power loom, having an intermittently rotating drive shaft (1) with at least one slot (2), and a pawl (5) that can be engaged in the slot and that is disposed on an eccentric (6) rotatably mounted on the drive shaft, as well as a strap (7) around the eccentric, of a crank rod for the drive of the heddles, and at least one control lever (14-17) movable into the path of the pawl (5), disengaging the latter, which control lever can be swung back and forth by a bar (23) engageable in a stroke meter drive (25), characterized by a stroke portion (31-33) reciprocated by a drive (48) and engaged on one side to the bar (23), on the other side to a program control device (51, 53), which portion (31-33) carries two levers (41, 42) which are pivotable one against the other and are pulled by a spring (37) against a middle abutment (44) between which levers (41, 42) engages a driving member (45) of the drive (48).

2. Arrangement according to claim 1, characterized in that the stroke portion (31 to 33) cooperates at its scanning end (33) with the pivotable armature (53) of an electromagnet (51) contained in the program control device.

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