DE1293095B - Double-stroke dobby with frame-mounted, pattern-controlled holding hooks - Google Patents

Description

The invention relates to a double-stroke dobby with at the balance ends arranged hooks, with holding hooks that are fixed to the frame and controlled according to the pattern od. The like .. cooperate, as well as applying to the balance hook ends and the balancing end to and fro traverses.

If there are discrepancies in the process of a loom the piercing device responds and thereby all movements including the Up or down movement of the shafts are suddenly stopped, it can be with known Machines of the above-mentioned type it happens that the meshing, Lift off the hooks and retaining hooks arranged on the balance ends from one another. In any However, the case is transferred from the hook arranged at the balance end to the holding hook Strength greatly reduced. That is a consequence of the deceleration bump, which from the is exerted on the balance by the traverse moving away from the retaining hooks. By the Lifting of the hooks from one another or the reduction of the forces by which they are held in engagement with each other, they can disengage from each other. Under the action of the tension springs on the shaft pulling elements causes the shaft to move in the lower shed position, so that the correct sequence of the shaft positions according to the pattern is not preserved. This shaft movement is also uncontrolled and sudden and can result in thread breaks and damage to the shaft suspension.

These disadvantages are avoided according to the invention that at each Balance hook attacks a spring, the other end with the balance or with the second hook of the same balance is connected and under their action the balance hook endeavors to reduce the tensile forces on the hook in the event of a sudden release occurring movement of the retaining hooks towards the disengaged position follow.

Preferred further embodiments of the invention emerge from FIG the subclaims. An exemplary embodiment of the invention is given below of the drawing, which schematically shows a side view of the mechanism for the control and shows the movement of a shaft.

The control of the shaft movement is used by the punch card 1 from the card cylinder 2 is taken. The reading needles 16 cooperate with this. Depending on the position of the pulling needles 3 connected to the reading needles 16, these are moved by the back and forth swinging pull rails 4, whereby the position of the retaining hooks 5 being affected. These retaining hooks 5 are pivotable on the fixed axes 6 and are under the action of the spring 7.

The element used for the actual movement of the shaft (not shown) is the half rocker 8, which is pivotably mounted on the stationary axle 9. The train A of the shaft to be moved is attached to the half rocker 8. The half rocker is hinged to the balance 10, which has a balance hook 11 at each end. Due to their oscillating back and forth movement, the two crossbars 12 alternately press the balance hooks 11 into the attachment. In the drawing, both holding hooks 5 have been controlled in such a way that they hold the draw hooks 11. The upper holding hook 5 has collapsed into the balance hook 11 pressed towards it by the cross-member, while the lower holding hook has already been hooked into the balance hook 11 during the previous shot.

If the loom is suddenly stopped approximately in the position in which the traverses 12 cross each other due to the triggering device responding, the balance 10 experiences a deceleration shock due to the sudden standstill of the traverse 12, which is moved to the right in the drawing and with which the corresponding end of balance also moved to the right. The balance hook at the other end of the balance can thereby lift off the retaining hook 5. At least the tensile forces between these hooks are reduced. Under the action of the spring 7, the retaining hook 5 tends to pivot outward. Since a spring 13 is arranged between the balance hook 11 and the balance 10 , the hook 11 follows the movement of the holding hook and so the hook tip 14 remains in engagement with the base of the holding hook 5, so that the hooks are prevented from being unhooked. In order to limit the tilting movement of the holding hooks 5 and the hooks 11, a stop 17 or 18 can be attached to the balance end and to the machine frame.

The two drawn tension springs 13 can be replaced by a single spring, the ends of which are each attached to a balance hook.

Instead of the drawn tension springs, compression springs or spiral springs wound around the pivot shaft 15 of the balance hooks can also be arranged.

Claims (5)

Claims: 1. Double-stroke dobby with hooks arranged at the balance ends, which interact with the frame-mounted, pattern-controlled retaining hooks or the like, as well as with the balance hook ends resting and the balance ends reciprocating traverses, characterized in that on each Balance hook (11) engages a spring (13), the other end of which is connected to the balance (10) or to the second hook (11) of the same balance and, under the action of the balance hook (11), strives to prevent the Hook from the tensile forces to follow movement of the retaining hooks (5) in the direction of the disengaged position. 2. Machine according to claim 1, characterized in that the springs (13) are tension springs. 3. Machine according to claim 1, characterized in that the springs (13) are designed as spiral springs, which are wound around the bearing axis (15) of the balance hook (11). 4. Machine according to one of claims 1 to 3, characterized in that on the balance (10) Stops (17) are arranged to limit the pivoting movement of the balance hook. 5. Machine according to one of claims 1 to 3, characterized in that the machine frame Stops (18) are arranged to limit the pivoting angle of the retaining hooks (5).