IMPROVE- MENTS IN AND APPLICABLE TO SCREENS OR SIEVES USED IN THE MANUFACTURE OF FLOUR
Year: 1884

page_text: I, THOMAS NIELD ROBINSON, of Railway Works, Rochdale, in the county of
Lancaster Engineer do hereby declare the nature of my said invention for IMPROVE-
MENTS IN AND APPLICABLE TO SCREENS OR SIEVES USED IN THE MANUFACTURE OF
FLOUR, to be as follows:-
.
The objects are first, to construct screens or sieves used in separating and
purifying middlings and dressing meal and flour, in such manner that the cloth or
silk may be readily attached to and detached from the frame and easily kept
stretched in suitable condition for work and second, to give motion to screens or
sieves in an improved manner.
My invention consists, under the first part in constructing the screen or sieve
frame in three portions two to hold the cloth or silk and the third to carry the
combined pieces above mentioned.
The cloth or silk holding portions are made with corresponding grooves and
projections or tongues and are held together by screws bolts clips or other suitable
means. The third portion is fitted with screws or nuts taking into or on nuts or
screws attached to the cloth or silk holding portions.
In practice the cloth or silk is held between the groove and tongue pieces and is
stretched to the requisite extent by moving the said pieces apart through the
agency of the screws nuts or their equivalents herein before mentioned.
Under the second part I give motion in one direction to screens or, sieves by
means of excentrics, cranks or reciprocating mechanism attached by straps or
flexible agents to the said screens or sieves. Motion is imparted in the reverse
direction by springs. In this way an even and steady motion is given to the screen
or sieve..
•

page_text: COMPLETE SPECIFICATION.
I THOMAS NIELD ROBINSON of Railway Works Rochdale in the County of
Lancaster Engineer, do hereby declare the nature of the said invention for
"IMPROVEMENTS IN AND APPLICABLE TO SCREENS OR SIEVES USED IN THE MANU-
FACTURE OF FLOUR " and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
The objects are First. To construct screens or sieves used in separating and
purifying middlings and dressing meal and flour, in such manner that the cloth or
silk may be readily attached to and detached from the: frame and easily kept
stretched in suitable condition for work: and Second. To give motion to screens or
sieves in an improved manner.
My invention consists Under the first part in constructing the screen or sieve
frame in three portions two to hold the cloth or silk and the third to carry the
combined pieces above mentioned.
The cloth or silk holding portions are made with corresponding grooves and pro-
jections or tongues and are held together by screws bolts clips or other suitable
means. The third portion is fitted with screws or nuts taking into or on nuts or
screws attached to the cloth or silk holding portions.
In practice the cloth or silk is held between the grooved and tongue pieces and
is stretched to the required extent by moving the said pieces apart through the
agency of the screws nuts or their equivalents hereinbefore mentioned.
Under the second part I give motion in one direction to screens or sieves by
means of excentrics cranks or reciprocating mechanism attached by straps or
flexible agents to the said screens or sieves. Motion is imparted in the reverse
direction by springs. In this way an even and steady motion is given to the screen
of sieve
Fig 1 is a side elevation of a screen or sieve and actuating appliances. Fig 2 is a
transverse section and Fig 3 a plan showing the means of securing and stretching
the silk.
is
a framo of screen or sieve carrier, hung by links b from the frame of the purifier,
c frame of screen or sieve made with a groove and cap d, e silk, f nuts, g thumb-
screws, h* thrustplates secured to a. The silk is held in position by the cap d,
the projecting portion of which forces the silk into the groove in
the cap
secured to c by means of screws, If desired the groove might be in the cap and
the projection in the frame c or two or more grooves or projections may be used.
The silk is tightened by turning the thumb screws g so as to draw the sides c of
the screen or sieve frames further apart. h excentrics on shafts i carried on
bearings secured to the frame j of the purifier. The excentrics are surrounded by
straps k from which the flexible connections & lead over the pulleys m to the

page_text: fraine a.
n spring connected to the frames ; and a. It will be evident that as the
shaft i revolves it will give motion to the excentrics straps and flexible connection
so as to pull the screens in one direction whilst the springs n will cause the said
screens or sieves to move in the opposite direction.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
First. Constructing screens or sieves used in the manufacture of flour with a
frame in threo portions a, c and d united in the manner and for the purposes sot-
forth.
Second. Giving motion to screens or sieves used in the manufacture of flour by
means of crank excentric or equivalent mechanism and connections and springs
substantially as setforth.