Improvements in Book-sewing Machines.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Book-sewing Machines.
I, HENRY LIEBERT, of Ivy Villa, Victoria Park, Manchester, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in machines for sewing together the
sheets or signatures of books and has for its object, firstly, to provide means
whereby the needles are relieved of the strain exerted thereon during the looping
operation by the thread, which strain heretofore caused the needles to bend,
break and wear the thread. Secondly, to provide means whereby the speed of the
feeding table upon which the sheets or signatures to be sewn together are placed is
accelerated during the inner part of its oscillation, whilst it will move sufficiently
slow during the outer part of its oscillation to receive the said sheets or signatures
and thus increase the production of the machine.
In carrying out the first part of my invention I adapt one of the thread tension
discs to be lifted or depressed from the other so as to free the thread from tension
during the looping operation and thus allow the thread of being easily drawn
through the needles. This I may effect preferably by means of a lever one end of
which is adapted to engage one of the said discs whilst the other is operated
upon by a reciprocating cam or eccentric surface receiving its motion from any
moving part of the machine, say from a cam fixed upon the lever cam shaft,
imparting motion to a lever coupled by means of a link to a crank lever secured
upon the axis of the said cam or eccentric surface.
In carrying out the second part of my invention I rotate the shaft from which
the oscillation of the feeding table is obtained by cams and levers, by means of
elliptical wheels one of which by preference is secured upon the driving end of
the said shaft and the other, attached to a carrier, mounted upon a stud and
rotated thereon by a pinion fixed on the driving shaft and gearing into the said
carrier.
ha 1905
F. BOSSHARDT & Co.,
Agents to Applicant.
I, HENRY LIEBERT, of Ivy Villa, Victoria Park, Manchester, in the County
of Lancaster, Engineer, 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 relates to improvements in machines for sewing together the
sheets or signatures of books and has for its object, firstly, to provide means

page_text: whereby the needles are relieved of the strain exerted thereon during the looping
operation by the thread, which strain heretofore caused the needles to bend, break
and wear the thread. Secondly, to provide means whereby the speed of the feeding
table, upon which the sheets or signatures to be sewn together are placed, is
accelerated during the inner part of its oscillation, whilst it will move sufficiently
slow during the outer part of its oscillation to receive the said sheets or signatures
and thus increase the production of the machine.
And in order that my invention may be more fully understood I have caused to
he appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. 1 is an end view and Fig. 2 a side view of the driving end of the machine
showing my invention applied.
Figs. 3 & 4 are respectively a sectional end and a side view of some details of
my invention.
a is the frame of the machine, 6 the driving shaft, c the table upon which the
sheets or signatures to be sewn together are placed, and d, d¹ the thread tension
discs.
In carrying out the first part of my invention I adapt one of the thread
tension dises d, d', say the lower one d, to be lifted or depressed from the other so as
to free the threads from their pressure and tension during the looping operation
and thus allow the thread of being easily drawn through the needles. This
I effect by means of a lever e one end of which is adapted to engage the disc d
whilst the other is operated upon by a reciprocating cam, or as in the present
instance by an eccentric surface ƒ formed on a shaft f', see more particularly
Fig. 3, which latter receives its motion from any moving part of the machine, say
from a cam g fixed upon the lever cam shaft h, acting upon a bowl i carried by a
lever arm coupled by means of a liuk k to a crank lever l secured upon the
shaft f¹.
The cam g is fixed in such position upon the shaft h that the moment it strikes
the bowl the connection between the same and the lever e causes the latter to be
actuated and depress the thread guide disc d and thus release the thread from
tension whilst when the cam g leaves the bowl i, the spring m which supports the
disc d raises the latter again to its normal position and applies tension to the
thread.
Upon one end of the shaft f¹, see more particularly Figs. 2 & 3, next to the
bracket n which supports it, I fix a hand lever o. The said bracket and hand lever
are each formed with a hole adapted for the reception of a pin o¹ placed under the
influence of a suitable spring.
When, the machine is at rest and it is desired to relieve the threads from the
pressure of the tension discs d, d' the cam shaft f¹ is turned into the position shown
in Fig. 3 by means of the lever o the lower end of which is then locked by the
said pin entering the hole formed therein.
In carrying out the second part of my invention I rotate the shaft p from which
the oscillation of the feeding table is obtained (by a cam or cams p¹ and levers p²)
by means of a pair of elliptical wheels q, q', one of which, say q, by preference
is secured upon the driving end of the shaft p and the other q attached to or
formed with a carrier wheel r, mounted upon a studs and rotated thereon by a
pinion t fixed upon the driving shaft 6 and gearing into the carrier r.
The elliptical wheel g is so fixed relatively to the cam p¹ upon the shaft P, that
the rotation of the cam p' is accelerated during the inner part of the oscillation of
the table c and during its outer part rotated slow enough to receive the sheets or
signatures to be sewn together.
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-
1st. In book-sewing machines wherein the threads are passed between discs.

page_text: means for automatically releasing the threads during the looping operation from
the pressure of the said discs, all substantially as and for the purpose set forth.
2nd. In book-sewing machines, wherein an oscillating table is employed to
support the sheets or signatures to be sewn together, the use of elliptical wheels
for imparting motion to the cam or cams which actuate the said table, all
substantially as and for the purpose set forth.
Dated this 24th day of September 1896.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.