Year: 1886

page_text: [Communicated from abroad by JOHN WILLIAM AITKEN, of 873, Broadway, in the
City, County, and State of New York, United States of America, Merchant.]
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention to be as follows:-
The object of this invention is to provide a new and improved sewing machine which
sews with a single thread and is used for making a cross or binding stitch.
The invention consists essentially of a machine provided with a movable throat plate
secured to a rod having a reciprocating motion which is imparted to the said rod from
the main shaft.
By means of cog wheels, or other suitable power transmitting devices, a sleeve is
revolved from the main shaft, the said sleeve being provided with a cam surface which
acts on a sliding collar mounted upon the main shaft and connected indirectly with the
lower end of a lever having its outer end connected with the needle bar guide adapted
to swing laterally by a suitable mechanism.
A looper is mounted on the end of a sliding rod which is fitted in the tubular main
shaft, and is operated from the sliding collar above mentioned.
The throat plate is located below the sewing plate over which passes the cloth, and is
secured to and projects from one end of a rod, which has its other end in a socket
projecting from a ring surrounding the collar on the main shaft, whereby the said
throat plate is reciprocated so that its position will at all times correspond with that of
the needle and looper. This throat plate is provided with a single needle slot.
Dated this 2nd day of November 1886
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do reby declare the nature of this Invention (a communication to me from
abroad by John William Aitken of 873 Broadway in the City County and State of
New York United States of America Merchant) and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
The object of this Invention is to provide a new and improved sewing machine
which sews with a single thread and is used for making a cross or binding stitch
especially applicable for sewing the edges of material.
The Invention consists of a machine provided with a movable throat plate secured
to a rod having a reciprocating motion which is imparted to the said rod from the
main shaft.
The Invention also consists of various parts and details and combinations of the
same as will be fully described hereinafter, and then pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
specification in which figure 1 is a sectional plan view of the improved sewing machine
and figure 2 is a front view of part of the same. Figure 3 is a front view, figure 4 a
plan, and figure 5 an end elevation of the entire machine drawn to a slightly smaller
scale than figures 1 and 2. Similar letters of reference indicate corresponding parts
in all the figures.
By means of cog wheels or other suitable power-transmitting devices, the sleeve I is
revolved from the main shaft A, the said sleeve I turning loosely on the shaft B mounted
on the bracket C on the base of the machine. The sleeve I is provided with a cam D
which, by acting on a socket Q attached to a sleeve R surrounding a collar E mounted
to slide on the main shaft A, imparts a sliding motion to said collar E. The parts
moved in one direction by the edge_cam D are returned by the action of a spiral
spring B¹ located in the hollow shaft B on which the cam revolves, the spring pressing
the roller d against the cam. Instead however of using an edge cam and spring a
groove cam may be used to effect both the forward and backward movements. To the
socket Q is also connected the lower end of the lever F which is bent upwards and
jointed at its upper end to an arm on the needle bar guide which is pivoted on the
rod of the presser foot and receives, through the instrumentality of the said arm and
lever, a lateral swinging motion on the presser foot rod as a centre. In addition to
the lateral swinging motion, the needle bar also receives the usual vertical reciprocating
motion in its guide by means of an arm operated by a cam on the main shaft as usual.
The looper B is mounted on the end of the sliding rod J which is fitted to slide in the
tubular main shaft A and is operated from the said sliding collar E, the connection
between the collar E and rod J being made by a cross-pin passing through a slot in
the shaft A of sufficient length to permit of the necessary sliding motion of the looper

page_text: rod J by which the looper is moved laterally at the same time as the needle bar and
to the same extent so that its point will catch the thread from the needle at each
descent of the latter. The throat plate M is laterally movable and is provided with a
single needle slot N. It is located below the sewing plate over which passes the
cloth, and is secured to one end of the rod P which has its other end in the socket Q
whereby the said throat plate M is reciprocated so that its position will at all times
correspond with that of the needle and looper.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, I declare that what I claim is
1. In a sewing machine the combination with the main shaft of a rod, a throat plate
secured to one end of the said rod, and intermediate mechanism for reciprocating the
said rod from the main shaft, substantially as herein shewn and described.
2. In a sewing machine the combination with the stitch forming mechanism and a
loose collar on the main shaft and means for sliding said collar, of a rod connected to
the said collar and a slotted throat plate on the said rod, substantially as herein shewn
and described.
3. In a sewing machine the combination with the mechanism for making the
stitches, of a movable throat plate, a rod to which the same is secured, and of
mechanism for reciprocating the said throat plate from the main shaft of the machine,
substantially as shewn and described.
4. In a sewing machine the combination with a stationary sewing plate, a movable
needle bar, and a looper, of a reciprocating rod, a throat plate secured to said rod, and
means for operating the said looper and reciprocating rod, substantially as herein
shewn and described.
5. In a sewing machine the combination with the stitch forming mechanism and the
main shaft A provided with the sliding collar E and ring R surrounding the collar, the
sleeve I having the cam D, and means for operating the sleeve I from the shaft A, of
the rod P connected to the ring R and the throat plate M secured to the said rod and
provided with the slot N, substantially as herein shewn and described.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.