Textiles: weaving – Warp manipulation – Feeding
Reexamination Certificate
2000-04-14
2001-03-13
Falik, Andy (Department: 3741)
Textiles: weaving
Warp manipulation
Feeding
19, 19
Reexamination Certificate
active
06199596
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a let-off warp beam coupling device used when a let-off warp beam is coupled to or uncoupled from a weaving machine for coupling and uncoupling an end of a rotating shaft of the let-off warp beam and a beam gear. The beam gear is positioned on the weaving machine side and provided movably in the axial direction of the beam gear.
An example of a conventional let-off warp beam coupling device for coupling and uncoupling a shaft-end of a let-off warp beam and a beam gear on the side of a weaving machine is as shown in FIG.
1
. In the device, on a surface around one end of a beam shaft
2
of a let-off warp beam
1
, there was formed a spline portion
3
, to which a beam gear
4
was fitted in coaxial. The beam gear
4
is provided on the side of the weaving machine for driving the let-off warp beam
1
through the beam shaft
2
and has a fitting bore
5
at the center with grooves
4
a
formed inside so as to be fitted to the spline portion
3
. The beam gear
4
is provided so as to be movable backward and forward with respect to the end of the beam shaft
2
of the let-off warp beam
1
by a back and forth driving mechanism
6
. This allows the grooves
4
a
of the fitting bore
5
of the beam gear
4
to be engaged and disengaged with the spline portion
3
.
There was also another type of the let-off warp beam coupling device as shown in FIG.
2
. The device is provided with a clutch
8
comprising a channel
6
provided at an end surface of the beam shaft
2
of the let-off warp beam
1
and a protruded strip
7
provided so as to be freely fitted to the channel
6
. The protruded strip
7
of the clutch
8
is provided integrally with the beam gear
4
on the side of a weaving machine with its center on the axis of the beam gear
4
. It is movable together with the beam gear
4
backward and forward with respect to the beam shaft
2
by the back and forth driving mechanism
6
.
In each of the conventional devices, there were problems such as misalignment of the axis of the beam shaft
2
of the let-off warp beam
1
with the axis of the beam gear
4
or the back and forth driving mechanism
6
. Backlash produced between the spline portion
3
and the grooves
4
a
of the fitting bore
5
, and rattling produced between the channel
6
and the protruded strip
7
of the clutch
8
. In addition, this failed to transmit accurately the rotating motion of a pinion, which is in a driving mechanism for driving the beam gear
4
provided on the weaving machine side, to the let-off warp beam
1
. As a result, variation was caused in the tension of the warp fed from the let-off warp beam.
In view of the foregoing, it is an object of the present invention to provide a let-off warp beam coupling device which can accurately transmit a driving motion without any variation factors such as backlash and misalignment.
SUMMARY OF THE INVENTION
The let-off warp beam coupling device according to the present invention has a let-off warp beam rotatably and detachably mounted on a specified position of a weaving machine and a beam gear provided on the weaving machine so as to be opposite to a shaft end of a beam shaft of the let-off warp beam for rotating the let-off warp beam. The coupling device couples the beam gear to the beam shaft for driving it, and comprises a driven coupling member, and a driving coupling member. The driven coupling member is secured at the shaft end of the beam shaft of the let-off warp beam, and has a plurality of projections provided on a circle positioned on a plane perpendicular to the axial direction of the beam shaft. Each of the projections projects in the axial direction of the beam shaft and has a side face tapered in the axial direction. The driving coupling member is provided on the beam gear side so as to be opposite to the driven coupling member with a specified spacing therebetween, and has a plurality of projections provided on a circle positioned on a plane perpendicular to the axial direction of the beam shaft. Each of the projections projects in the axial direction of the beam shaft toward the driven coupling member and has a side face tapered in the axial direction. The projections are formed so that adjacent projections of one of the driven coupling member and the driving coupling member make each of the opposite projections of the other fitted therebetween without leaving any space. The device further comprises a holding member for holding an interengagement state in which adjacent projections of one of the driven coupling member and the driving coupling member are fitted between the opposite projections of the other coupling member without leaving any space therebetween. Moreover, each of the driven coupling member and the driving coupling member has the projections radially provided coaxially with respect to the direction of the beam shaft in equal intervals.
The let-off warp beam coupling device according to the present invention comprises the driving coupling member and driven coupling member both having projections radially formed coaxially with each other each having tapered sides mutually fitting with the other without any space between them. This allows a sure self-aligned coupling such coaxial that a connection is possible without any inexpedience such as misalignment, backlash and rattling in a coupled state.
REFERENCES:
patent: 2405698 (1946-08-01), Jameson
patent: 3915198 (1975-10-01), Svaty et al.
patent: 6015034 (2000-01-01), Rupflin
Falik Andy
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Tsudakoma Kogyo Kabushiki Kaisha
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