Improvements in and relating to Sewing Machines.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Sewing Machines.
I, HENRY ALFRED OLDERSHAW of No 38 High Cross Street Leicester in the
county of Leicester Engineer and Machinist 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 refers to "Improvements in and relating to sewing machines wherein
the lateral vibration or reciprocation of the needle bar may be stopped without having
to shift the block in the groove of the quadiant, or swinging plate as described in the
Specification of my application for Letters Patent No 450 dated January 10th,
1889. By stopping the vibration of the needle bar after overseaming and making
two or more straight stitches the threads left from the lace or button hole are auto-
matically fastened off by making a lock stitch after the overseaming zig zag stitch.
This invention is applied to sewing machines wherein the needle bar is vibrated or
reciprocated laterally by a swinging frame and rod connected to a swinging plate or
quadrant.
The devices shown in the accompanying drawings are employed in conjunction
with the grooved or screw cam 3, but may be used with any equivalent thereof to
operate the grooved plate, or quadrant. 7, or swinging lover 71 to regulate the move-
ment imparted to the rocking frame which carries the needle bar, by the connecting
rod 11
That this invention may be well understood I will now refer to the several figures
of the drawings accompanying this Specification of which Figure 1. is a cut off view
of an overhanging arm of a sewing machine, the double grooved or screw cam 3.
being mounted on the top shaft a' the connecting rod 11, is attached to the block 10,
in the groove of the swinging plate or quadrant, by the crank 6, the block, 10, in the
groove of the quadrant 7, 15 moved by the operator pushing or pulling the handle 15,
of the rocking shaft 31. to lengthen, or shorten the zig zag stitch, and to automatically
fasten off the stitch after lace or button holes have been overseamed, the said rocking
shaft is carried in the supports 32, the angle end 33, being fitted to the block 10. by
the pin, 34.
Figure 2. is anotber form of the device as shown in the preceding figure, the
rocking shaft 31, is carried in the supports 32, the slotted arm 33, carrying a link 34
secured to a block in the slot of the connecting rod 11, by the pin 35 and operated
in the same manner as figure 1.
Figure 3. is another form of rocking shaft 31, and its accessories, consisting of the
arm 33, connected to a ball jointed rod 34, secured to the connecting rod by the
plate 35.
In Figure 4. the rod 11, carries a cam lever 15, which bears against the block 10,
the vibration of the needle bar being stopped by depressing the hand lever 15, when
the slotted connecting rod 11, is moved forward by the lower end of the cam lever,
when the catch pin 7 comes against the stop 7%, the needle bar will then have no
movement from the rocking frame.
Figure 5. in this device, for stopping the vibration of the needle bar, when the
handle 15 is depressed, the connecting rol 11, will work freely in the slot of block B,
carried by the block, and no motion will be communicated to it.
Figure 6 is a front view of the grooved plate or quadrant 7, Figure 7, the stop 7'
being screwed to the side thereof, so that it comes against the side of the swinging
plate 71 (shown in the next figure) when the handle, 15. is depressed. When it is
desired to stop the vibration of the needle bar the tal of the hand lever which is

page_text: carried by a fixed pivot is brought up against the grooved plate or quadrant 7 and t
is disconnected from the swinging lever, or plate 71 the spring 73 15 mounted at one end
on the hook 7 at the top of the quadrant 7, and at the end of the arm 75 which is
secured at its inner end on the top of the swinging plate 71.
Figure 7. is a side view of the preceding figure, the pin 6. in the swinging plate 71
fits into the hole 4 in the block riding in the grooves of the screw cam, fixed on the
top shaft a', from which or by the equivalent of which the swinging plate derives its
motion, the pin 8, heing fitted into the hole in the bearings 9, under the screw cam
or other similar device
Figure 8 in this view of the grooved plate or quadrant 7, it is provided with a
lug, B-into which is fitted the hand lever 15, when this is raised the tail thereof comes
in contact with the side of the swinging plate 71, to connect it with the quadrant for
overseaming.
Figure 9. is a top view of Figure 8, shewing the position of the hand lever 1', when
it is desired to fasten off the stitch after overseaming.
To regulate the zig zag stitch by the nse of the devices shown in figures 2, 6 and 8,
the Thumb Screw S is used to adjust the block 10, in the groove of the quadrant 7.
The method, or means whereby the overseaming of lace or button holes and the like
is accomplished is fully specified and claimed for in my Application No. 450, of the
present year and the vibration is therein stopped by shifting the block to the
bottom of the groove of the swinging plate, but by this invention, after the over-
seaming is accomplished in each lace hole, or after an embroidered flower sewn
out of the radial line has been worked, by the manipulation of the handle of the
rocking shaft 31, or hand lever 15, the vibration of the needle bar laterally 19
stopped and the stitches of the lace or button hole and the like are fastened off
automatically that is to say without anyone having to fasten off the stitch after
each hole has been overseaned, which is now the case, the effect of moving the
grooved plate to the left, or disconnecting the grooved plate from the swinging
lever or plate as herein before described being that the stitches become locked
together the straight stitches covering and securing the threads after overseaming
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is
1. In a sewing machine wherein the needle bar is vibrated or reciprocated laterally
by a swinging frame and rod_connected to-a-quadrant-or-swinging-plate-pivotted
under a screw, or may be a face cam, and operated thereby the means for auto-
matically fastening off the stitches after overseamming by disconnecting the grooved
plate or quadrant 7, from the swinging plate or lever 7¹ in the manner hereinbefore
described.
2 Stopping the vibration of the needle bar to automatically fasten off the stitches
after overseaming by the means of a slotted connecting rod 11, secured to the
block 10, in the grooved quadrant 7, as herein before described
3 In a sewing machine of the character described automatically fastening off the
stitches after overseaming and regulating the swinging frame in zig zag stitching by
a rocking shaft, 31, connected to the swinging or grooved plate 7-and operated sub-
stantially in the manner and for the purpose hereinbefore described and set forth.
Dated this 3rd day of May 1889.
WILLIAM BESTWICK MAXFIELD,
Patent Agent,
The "Central" Office for the Procuration of Letters Patent, &c.,
No. 19, Bowling Green Street, Leicester,
Agent for the Applicant.