Weaving machine with a synchronously or independently operable m

Details Weaving machine with a synchronously or independently operable m Weaving machine with a synchronously or independently operable m

1989-04-11

1991-01-22

Falik, Andrew M.

Textiles: weaving

Warp manipulation

Shedding

139 1E, 139 1R, 139336, D05C 112

Patent

active

049863150

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a weaving machine.
So-called mechanical dobbys are used in association with weaving machines and are rigidly coupled to the weaving machine in that the camshaft of the weaving machine drives the dobby. In such installations, the relationship of the change point to the beat up point of the batten is adjustable and such installations have been known for a long time.
For many applications, it would be of advantage if, on the one hand, the dobby could be driven by the weaving machine while, on the other hand, driving of the dobby independently of the camshaft of the weaving machine were also possible so that a "weft search", an influencing of the "changeover point" i.e., the point at which a harness change occurs, and a "shedding motion time reduction" could be achieved for weaving machines.
This object of the invention is achieved in that the drive connection between the camshaft of the weaving machine and the dobby can be modified by a separate drive.
In one embodiment of the invention, instead of a direct coupling to the weaving machine, the rate of change of the harness, which is set by eccentrics, is increased or decreased relative to the motion of the weaving machine by a separate drive. In this manner, it becomes possible to improve the fabric in a mechanical dobby by adjustment of the rate of change of the harness.
An electrically regulated motor, e.g., a step motor or AC-/DC-motor with suitable electronic controls or programming, can be used as a drive.
The triggering contact pulse preferably comes from the camshaft of the weaving machine or a programmed device and can be steplessly adjusted in time.
If programmable control of the drive is provided, then both the acceleration and deceleration periods of the motion, as well as the periods of movement and standstill, can be preprogrammed (e.g., for step motors and electronically controlled motors, the so-called acceleration and deceleration slopes).
When the weaving machine is stationary, the dobby can be moved forwards and backwards without movement of the batten. This can be of importance for various reasons, e.g., for the removal of threads in order to eliminate defects. After deactivation of the automatic starting mechanism by the contact pulse transmitter, the dobby can be rotated in the desired direction or to the desired position before the previously described normal operation with the automatic mechanism continues.
In another embodiment of the invention, the dobby is driven by the camshaft of the weaving machine during normal operation but such that, for specific applications, e.g., forward and backward rotation of the dobby, the drive connection between the weaving machine and the dobby can be modified. In accordance with this embodiment, a planetary gear is used as a coupling gear and this planetary gear is provided with a freely rotatable housing which is engaged by a servomotor. During normal operation of weaving machines and dobbys, this housing is fixed via a disc brake or other arresting element (a self-braking worm drive, a hydraulic cylinder, a pivot drive or a toggle joint with an arresting mechanism) so that the camshaft directly drives the dobby. On the other hand, during a so-called weft search, the housing is released and then driven by the servomotor so that driving of the dobby occurs via the servomotor and is not influenced by the camshaft of the weaving machine.
An important feature of the installation according to the invention resides in that the changeover point is programmable. Driving of the planetary gear housing occurs with each rotation of the main shaft (with each weft) and the adjustment preferably takes place in the resting phase of the eccentric so that the changeover period is not affected.
Exemplary embodiments of the invention are described below with reference to the drawings. In the drawings:
FIG. 1 is a schematic front view of a prior art weaving arrangement,
FIG. 1a shows the rate of change in the speed of the camshaft which drives the harnesses in the weaving arrangement of FIG. 1,


REFERENCES:
patent: 4463781 (1984-08-01), Binninger et al.
patent: 4474219 (1984-10-01), Froment
patent: 4478254 (1984-10-01), Beaudoux et al.
patent: 4537226 (1985-08-01), Gotoh
patent: 4538650 (1985-09-01), Kodama et al.
patent: 4592392 (1986-06-01), Vandeweghe et al.
patent: 4724872 (1988-02-01), Speich

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