Improvements in Sewing Machines for "Barring" or Tacking."
Year: 1891

page_text: Date of Application, 15th Aug, 1891-Accepted, 26th Sept., 1891
COMPLETE SPECIFICATION.
Improvements in Sewing Machines for "Barring" or Tacking."
I, HORACE LEROY KEMP of Gloucester Camden County, State of New Jersey,
United States of America, Manufacturer of Sewing Machines, do hereby declare
the nature of the said invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
My invention consists of certain improvements in machinery for "barring
ends of button holes, or for tacking or fastening any meeting or overlapping layers
of leather or textile fabric, the machine although capable of general application
for the purposes intended having been devised mainly for use in the manufacture of
shoes.
"the
The machine has a reciprocating needle, a shuttle, looping hook, or other
equivalent element of stitching mechanism working in conjunction therewith and a
work holder and feeder having both longitudinal and transverse movements, so
that stitches may be formed in directions at right angles or thereabouts in respect
to each other, and my invention comprises certain devices for imparting the
desired movements to said work holder, and also certain mechanism for auto-
matically stopping the machine when each barring or tacking operation has been
completed.
In the accompanying drawings,
Fig. 1, is a side view of the machine.
Fig. 2, is a plan view with part of the machine broken away.
Figs. 3 and 4 are end views showing the parts in different positions.
Fig. 5, is a sectional view, partly in elevation, of part of the machine.
Figs. 6 and 7, are diagrams illustrating the operation of another part of the
machine.
Fig. 8, is a rear view of a certain cam disc and worm wheel forming part of
the machine.
Figs. 9 and 10, are views illustrating certain modifications of the invention, and
Figs. 11 and 12, are enlarged diagrams illustrating the work for the performance
of which the machine is intended.
The operation known as barring "the end of a button hole involves the
formation of a few long stitches at the end of the button-hole, and transversely to
the line of the same, and the subsequent formation over these long stitches of a
series of short stitches, which are substantially at right angles to the long stitches,
said series of short stitches extending from one end of the long stitches to the
other, as shown in Fig. 11..
In the operation known as "tacking," however, the short stitches are bunched
at the ends of the long stitches, as shown for instance in Fig. 12.
In the machine shown in Figs. 1 to 4, 1 represents the bed plate of the
machine and 2 an arm projecting forwardly over said bed plate and having in the
enlarged front end suitable guides for the needle bar 3, and presser bar 4, said
presser bar being acted upon by a suitable spring tending to force it downward,
and being raised by means of a lever 5, hung to a bracket 6, on the arm 2, one
arm of this lever engaging with collars 7; at the upper end of the presser bar
and the other arm of the lever being connected by a rod 8, to a suitable treadle.
The driving shaft 9, of the machine is adapted to proper bearings in the arm 2,
and this driving shaft has upon it a fast pulley 10, and a loose pulley 11, onto
either of which the driving belt may be directed by the forked arm 12, of a belt
shipper, the shaft of which is adapted to a bearing 13, at the rear end of the head.
said shipper also having another arm 14 to be acted upon, as described hereafter.
so as to effect the shifting of the belt from the fast to the loose pulley or vice-versa.

page_text: Secured to or forming part of the fast pulley 10 is a spur wheel 15, which meshes
with a spur wheel 16, on a shaft 17, free to turn in a suitable bearing 18, on the
frame of the machine, said shaft having a worm 19, which engages with worm
teeth 20, on the back of a disk 21, the latter being hung to a screw stud 22, and
having peripheral cams 23, a projecting cam flange or rib 24, and an internal
cam 25, Figure 8. This cam 25, is secured to the disk 21, by means of a set
screw 26, which is adapted to a segmental slot 27, in the disk 21 and may be
adapted to any one of a series of threaded openings 28, in the cam 25, as shown in
said Fig. 8.
The cams 23, and 24, of the disk 21, serve to operate the work carrier in the
manner hereinafter set forth, but before describing said work carrier and its
operating devices I will first describe the mechanism for starting the machine
and for automatically stopping the same when it has completed the "barring" or
tacking operation.
Hung to the rear of the head 2, is a lever 30, the upper arm of which has
formed in it a notch 31, for engagement with a pin 32, projecting from the front
face of the spur wheel 16, a spring 33, tending to draw the notched end of the
lever into engagement with said pin. The other arm of the lever 30, however,
has a projecting toe 34, for engagement with a lever 35, hung to a bracket on the
arm 2, and held in engagement with said toe by a spring 36, the other arm of said
lever 35, projecting into the path of a lug 37, on the back of the cam disk 21, so
that said lug, at a certain point in the rotation of said cam disk, will strike and
operate the lever 35, so as to release the toe 34 from the control of the same, as
shown in Fig. 4.
At the rear of the head 2, is also hung a starting lever 38, which is acted
upon by a spring 39, tending to retain it in the position shown in Figs. 3, and 4,
but is also connected by a rod 40, to a suitable treadle under control of the
attendant.
When the machine is stopped, the parts are in the positions shown by full lines
in Fig. 4, the notched upper arm of the lever 30, engaging the pin 32, of the
spur wheel 15, and the belt shipper being in such position that its arm 12, directs
the driving belt onto the loose pulley 11.
On depressing the starting treadle, however, the rod 40, moves the lever 38, to
the position shown by dotted lines in Fig. 4, thus throwing backward the lower
arm of the lever 30, which strikes the arm 14, of the belt shipper and causes such
movement of the latter as to compel the arm 12, to move the driving belt onto the
fast pulley 10, and thus start the machine. At the same time the upper arm of
the fever is withdrawn from engagement with the pin 32, and, on the first move-
ment of the cam disk 21, the lug 37, is withdrawn from the lever 35, and the latter
falls into position to retain the lever 30.
The starting treadle is held in the depressed position until a few turns of the
shaft 9 have been made, and is then released so as to permit the lower arm of the
lever 30, to move forward slightly so as to bring its toe into engagement with
the lever 35, as shown in Fig. 3, but 'the belt shipper does not follow this move-
ment, for as soon as the disk 21, commenced to turn, the cam 25, on the back of
the disk acted upon a rod 41, guided in a suitable bearing at the back of the
arm 2, and projected this rod so as to cause it to bear against the arm 14, of the
belt shipper and thus retain the latter in position for holding the driving belt upon
the fast pulley, as shown in Fig. 6. The parts remain in this position until the
cam disk 21, has turned sufficiently to carry the cam 25, away from the forward
end of the rod 41, as shown in Fig. 7, whereupon the belt shipper will be moved
under the influence of a spring 42, Fig. 3, so as to shift the driving belt back onto
the loose pulley 11.
The momentum acquired by the machine, however will cause it to continue
running for some little time, hence the cam disk 21, will continue to turn until
the lug 37, thereon strikes the lever 35, and trips the same so as to release the
toc 34 of the lever 30, and permit the notched upper end of said lever to move into

page_text: engagement with the pin 32, of the spur wheel 15, thus definitely and positively
locking the machine.
By proper adjustment of the cam 25, on the back of the cam disk 21, in respect
to the tripping lug 37, of said disk, the time which clapses after the release of the
bolt 41, by the cam 25, and before the lug 37, trips the lever, 35, may be varied,
as described, so that, after the belt has been shifted onto the loose pulley the
machine may be allowed to make one or more turns due to momentum before being
finally locked by the engagement of the lever 30, and pin 32, the stoppage of the
machine being thus effected either suddenly, or gradually, as desired.
By forming the cam disc 21, with the worm teeth 20, directly upon the same, the
construction of the machine is simplified and cheapened as compared with a
machine having a shaft with independent cam disk and worm wheel secured to it.
The work carrier of the machine consists of a lower plate 45, and an upper
plate 46, the lower plate resting upon the bed 1 of the machine and being enlarged
at its front end as shown at 47, and the upper plate being elastic and bearing at its
front end upon the enlarged portion 47, of the lower plate 45, while its rear end is
secured to an elevated post 48, projecting upward from said lower plate 45.
The front portion of the plate 46, has an opening therein for the play of the
needle, and said plate is split longitudinally throughout a portion of its length,
so that one half of the plate can yield vertically, independently of the other half,
to permit it to act upon work which is thicker in one portion than another, as for
instance, when two layers of leather or textile fabric overlap one another.
Each half of the forward end of the plate 46, has a projecting hook 49 and on
the lower end of the presser bar 4, is a projecting yoke 50, which as the presser
bar is lifted, engages with these hooks 49, and effects the lifting of the forward end
of the plate 46, so as to release the work.
The rear end of the plate 45, has a pin 51 projecting downwardly through a
slot 52, in the bed plate i as shown in Fig. 5, and the lower portion of this pin is
connected to a spring 53, which is likewise connected to a depending stud 54, on
the underside of the bed plate and tends to pull the plate 45 forward, but at the
rear end of said plate is an upwardly projecting pin 55, on which is a vertically
adjustable link 56, slotted for the reception of an arm 57, on a rock shaft 58,
adapted to a bearing in the bracket 59, on the bed plate, and having another
arm 60, which carries an antifriction roller 61, bearing upon the peripheral cam
surface 23, of the cam disk 21, the spring 53, serving to maintain said roller
constantly in contact with said peripheral cam surface, so that, as the cam disk 21,
is rotated, longitudinal movements will be imparted to the plate 45, which move-
ments may be varied in extent as desired, by adjusting the link 56, on the pin 55,
so as to move it nearer to or further from the axis of the rock shaft 58.
The plate 45, also has another pin 62, projecting downwardly through an opening
in the bed plate 1, and acted upon by a spring 63, beneath said bed plate, as shown
by dotted lines in Fig. 2, and projecting downward from the enlarged end.47, of the
plate 45, is a stud 64, which is acted upon by one arm of a lever 65, this arm being
bent so as to pass through an opening 66, in the bed plate 1, and the lever being
hung to a stud or pin 67 on said bed plate, as shown in Figs. 1 and 2, the other
arm of the lever being slotted for the reception of a bolt 68, which likewise passes
through the slotted arm of a lever 70, hung to a stud 71, on the bed plate, said
arm overlapping the arm of a lever 65. The bolt 68 can be confined in any desired
position of adjustment in the slot of the lever 65, by a nut 69, so that by moving
the bolt in the slots the relative operative length of the connected arms of the two
levers may be varied so as to regulate the throw of the lever 65, and the consequent
extent of the lateral or transverse movements of the plate 45, the lever 70, being
positively operated by the cams of the projecting cam flange or rib 24, of the
disk 21, which act upon an antifriction roller 72, carried by the lever, this roller
being held in contact with the cam flange by reason of the pull of the spring 63,
upon the plate 45. By bending the forward arm of the lever 65, so as to it
carry

page_text: beneath the bed 1, said arm is prevented from interfering with the work lying upon
the enlarged end 47, of the plate 45.
In its lateral movements the plate 45, swings upon the pin 51, as a fulcrum, and,
if desired, this pin may project downward directly beneath the pin 55, as shown for
instance in Fig. 9, or the pin 51, may project upward from the bed-plate 1, and into
a slot in the plate 45, as shown for instance in Fig. 10. In either event, the
longitudinal and lateral movements of the work carrier are effected with very little
friction, and the machine is therefore much preferable to those in which the
work carrier is adapted to longitudinal and transverse guides on the bed of the
machine.
It will be evident that the number and character of the longitudinal and
transverse stitches produced by reason of the movements of the work carrier may
be varied, by simple changes in the character of the cams 23, and 24, of the cam
disk 21, so that there will be as many long stitches as desired and any required
arrangement or grouping of the short stitches formed over said long stitches.
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
1. The combination of the work carrier, pivoted at its rear end, levers for
imparting longitudinal and lateral movements to said work carrier, and a combined
peripheral and face cam for actuating said levers, substantially as specified.
2. The combination of the bed plate of the machine, with the work carrier pivoted
thereto, and a pair of levers, one for imparting longitudinal movement to said work-
carrier, and the other for imparting lateral movement thereto, the forward arm of
this latter lever being bent downward beneath the bed plate, and acting upon the
work carrier beneath said plate, substantially as specified.
3. The work carrier consisting of a lower plate pivoted at its rear end, and the
upper elastic plate secured to the lower plate at its rear end, and split at the front
end so that its halves are free to yield independently, substantially as specified.
4. The combination of the work carrier consisting of the lower plate pivoted to
the bed, the upper elastic plate secured to the lower plate at its rear end, and
having hooks near the front end, and a projection on the presser bar for engaging
with said hooks, and lifting the upper plate of the work carrier when the presser
bar is raised, substantially as specified.
5. The combination of the work carrier free to swing both longitudinally and
laterally on the bed of the machine, and having at its rear end an upwardly
projecting pin, vibrating arm for effecting the longitudinal movement of the work
carrier, and a vertically adjustable link serving as the connection between said arm
and the pin of the work carrier so as to vary the movement of the latter,
substantially as specified.
6. The combination of the work carrier free to swing both longitudinally and
laterally on the bed of the machine, with means for effecting the lateral movement
of said work carrier, comprising a cam disk and a pair of levers having overlapping
slotted arms and a bolt adjustable in said slotted arms, and serving as a means
whereby one of the levers actuates the other, substantially as specified.
7. The cam disk having peripheral cams, a projecting cam Hange or rib on the
outer face and an annular series of teeth or projections on the inner face for
engagement with a driving worm, substantially as specified.
8. The combination of the driving shaft of the machine, having fast and loose
belt pulleys, a belt shipper, a retaining bolt for said shipper, and a cam disk having
a cam for releasing said bolt so as to throw the belt onto the loose pulley at the
proper time in the operation of the machine, substantially as specified.
9. The combination of the driving shaft of the machine having fast and loose belt
pulleys, the belt shipper, a retaining bolt therefor, and a catch lever for positively
locking the machine, said belt shipper being operated in advance of the catch lever

page_text: so that the belt will be shifted onto the loose pulley, and the machine allowed to
run for a short time by momentum before being positively stopped.
10. The combination of the driving shaft having fast and loose pulleys, the belt
shipper, a retaining bolt therefor, a catch lever, a trip lever engaging therewith,
and a cam disk, having a cam for releasing the shipper bolt, and a trip lug for
operating the trip lever, the shipper bolt cam being set to act in advance of the trip
lug, substantially as specified.
11. The combination of the driving shaft having fast and loose pulleys, the belt
shipper, a retaining bolt therefor, the catch lever, the trip lever and the cam disk
having a trip lug and a cam for operating the shipper bolt, said cam being adjustable
on the disk so as to vary its position in respect to the trip lug, substantially as
specified.
Dated this 15th day of August 1891.
DAY, DAVIES & HUNT,
321, High Holburn, W.C., Agents for the Applicant.