Rotary shafts – gudgeons – housings – and flexible couplings for ro – Overload release coupling – Torque transmitted via resiliently biased positive drive...
Reexamination Certificate
1999-10-26
2001-06-12
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Overload release coupling
Torque transmitted via resiliently biased positive drive...
C464S030000, C139S076000
Reexamination Certificate
active
06244961
ABSTRACT:
The invention relates to an arrangement for the control of a rotational shaft coupling for a dobby.
BACKGROUND OF THE INVENTION
An arrangement for the control of a coupling apparatus is described in JP-8-296 143. This reference has a carrier which is stationary arranged inside a drive shaft. The drive shaft is formed as a hollow shaft with two holes that are arranged in a radial plane. Two switching tappets are arranged in the holes. Two control members are radially displaceable in the carrier with respect to the drive shaft. A two-way valve alternately actuates the control members. The control member is designed as a simply acting working cylinder with a piston that is under a spring action.
In this control member the piston is reset by means of the spring after the switching off or on of the valve has been completed. The working cylinder is ventilated at the same time switching occurs. With the rapid switching changes this proves to be disadvantageous.
SUMMARY OF THE INVENTION
The object of the invention is to improve an arrangement for the control of a coupling apparatus for a rotational dobby. A carrier (
4
) is stationarily arranged in a drive shaft (
1
) that is formed as a hollow shaft with holes (
10
) which are arranged in a radial plane. Two switching tappets (
5
) having two control members (
7
) which can be brought into operative engagement with the switching tappets are radially displaceable in the carrier with respect to the drive shaft. The two switching tappets (
5
) switch into a first position in order to switch the coupling apparatus into a drive position and into a second position in order to switch the coupling apparatus into an idling position. Pneumatic and magnetic valves (
8
;
43
,
44
) for the actuation of the control members are utilized. Two resetting elements (
9
) are provided inside the drive shaft (
1
) in order to displace the control members (
7
) into the second position.
The advantage which can be achieved with the invention is substantially to be seen in that the resetting of the piston is ensured in a form locked manner within a small angle of rotation of the drive shaft.
The coupling apparatus for the rotational dobby includes an eccentric disc (
22
) that is arranged on a drive shaft (
1
) that is formed as a hollow shaft. The hollow shaft has holes (
10
) that lie in a radial plane. A connecting rod (
23
) that is rotates is located at the periphery of the eccentric disc. This eccentric disc includes at least one follower (
24
) that is moveable with respect to the eccentric disc. Each switching tappet (
5
) can move in contact at these followers for the purpose of the latching in or latching out respectively of the coupling elements (
24
,
25
). A coupling ring (
21
) with two cut-outs (
27
) that are formed to lie diametrically oppositely is arranged on the drive shaft (
1
) in such a manner that the cut-outs are oriented with the holes (
10
). The two coupling elements (
24
,
25
) can in each case be latched in or out respectively into one of the cut-outs (
27
), usually at the same time, in order to couple or de-couple the eccentric disc (
22
) with the drive shaft (
1
).
This coupling apparatus has the advantage that the holding force is uniformly distributed over the pawls through the use of two pawls and the simultaneous latching in of the two pawls.
REFERENCES:
patent: 4387741 (1983-06-01), Palau et al.
patent: 4763697 (1988-08-01), Serturini
patent: 4905738 (1990-03-01), Kleiner
patent: 5479964 (1996-01-01), Burigana
patent: 0234321A1 (1987-09-01), None
patent: 0274119A2 (1988-07-01), None
patent: 7166444 (1995-06-01), None
patent: 8296143 (1996-12-01), None
Browne Lynne H.
Dunwoody Aaron
Sulzer Ruti AG
Townsend and Townsend / and Crew LLP
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