Improvements in Machinery for Doubling and Twisting Yarns or Threads.
Year: 1887

page_text: Improvements in Machinery for Doubling and Twisting Yarns
or Threads.
I, JOSEPH FARRAR, of Globe Works Halifax, Yorkshire, Machine Maker do hereby
declare the nature of this invention to be as follows:
This invention has special reference to trap twisting frames employed in doubling
or twisting two or more yarns or threads into one. My improvements more par-
ticularly refer to the usual vertical drum or roller around which the yarn passes on its
way from the unwinding bobbins to the spindle. In the construction of this class of
machines there is a board or covering employed to cover the mechanism of the
machine, which board or covering is placed in a position under the bottom of the
vertical roller above referred to, leaving a space between the upper part of the board
or covering and the underside of the roller. In the practical working of the machine
this space is a disadvantage, in consequence of the yarn which passes around the said
roller sometimes working or falling down and getting underneath the bottom of the
said roller, which at once spoils the twist of the yarn. Several devices have been
employed to prevent the yarn getting off the periphery of the roller onto the shaft or
boss below the roller, employed to drive it, such as forming a slit in the lower edge
of the said roller, and in another case making the parts conical or round between the
bottom of the roller and the shaft; but such devices have not been successful.
To prevent the possibility of the yarn getting underneath the vertical roller is the
object of my invention, and this I accomplish by making the roller of such a length,
that the bottom of it gets below the board or covering above referred to, or by raising
the said board or covering so that the top thereof reaches the bottom of the roller or
by lowering the roller to the top of the boarding so as to dispense or do away with any
space between the bottom of the roller and the top of the board or covering; by which
means the yarn cannot get underneath the bottom flange of the roller, consequently
the spoiling of the yarn thereby is prevented.
Dated this 4th dor of October 1887

page_text: I, JOSEPH FARRAR, of Globe Works, Halifax, Yorkshire, Machine Maker do hereby
declare the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
This invention has special reference to trap twisting frames employed in doubling
or twisting two or more yarns or threads into one. My improvements more par-
ticularly refer to the usual vertical drum or roller around which the yarn passes on its
way from the unwinding bobbins to the spindle. In the construction of this class of
machines there is a board or covering employed to cover the mechanism of the
machine, which board or covering is placed in a position under the bottom of the
vertical roller above referred to, leaving a space between the upper part of the board
or covering and the underside of the roller. In the practical working of the machine
this space is a disadvantage, in consequence of the yarn which passes around the said
roller' sometimes working or falling down and getting underneath the bottom of the
said roller, which at once spoils the twist of the yarn. Several devices have been
employed to prevent the yarn getting off the periphery of the roller onto the shaft or
boss below the roller which drives it, such as forming a slit in the lower edge of the
said roller, and in another case making the parts conical between the bottom of the
roller and the shaft; but such devices have not been successful.
To prevent the possibility of the yarn getting underneath the vertical roller is the
object of my invention, and this I accomplish by making the roller of such a length
that the bottom of it gets below the upper surface of the board or covering above
referred to, or by raising the said board or covering so that the top thereof reaches
the bottom of the roller, or by lowering the roller to the top of the boarding, so as to
dispense or do away with any space between the bottom of the roller and the top of
the board or covering.
Such being the nature and object of my said invention, I will now shew. how it may
be carried into practice, and for that purpose will make reference to the accompanying
sheets of Drawings, wherein Fig. 1 is section of so much of a trap twisting frame as is
necessary to shew the application of my improvements. a is the frame of the machine,
b the spindle, c the unwinding bobbins, and d the vertical trap drum or roller around
which the yarn passes on its way from the bobbins c to the spindle b, as shewn in the
Drawings. e is a board employed to cover the ordinary driving mechanism, and fis
the ordinary trap lever, through one end of which the yarn passes, all arranged in the
ordinary manner. It will be observed that the bottom of the trap roller d occupies a
position above the board e, leaving a space between the underside of the said trap
roller and the upper face of the board e, which space is a disadvantage, because the

page_text: yarn occasionally drops or slips off the trap roller, and gets onto the smaller diameter
thereof, and when this happens, the delivery of the yarn is retarded, producing
inferior yarn, or what is known as hard twist.
According to my invention, which is illustrated in Fig. 2, the bottom of the trap
roller occupies a position below the upper surface of the covering board, consequently
the yarn cannot get underneath the trap drum, as is the case when the said trap
roller occupies a position as shown in Fig. 1, therefore the production of faulty yarn,
as already explained, is now avoided.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In a trap twisting frame, the use of a trap roller, so placed or arranged, that the
bottom thereof is on a level with or below the upper surface of the covering board e
for purposes as described.