US1361057A

US1361057A - Take-up mechanism

Info

Publication number: US1361057A
Application number: US126923A
Authority: US
Inventors: George S Hill
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1916-10-21
Filing date: 1916-10-21
Publication date: 1920-12-07
Anticipated expiration: 1937-12-07

Description

G. S. HILL.

TAKE-UP MECHANISM. APPLICATION-FILED ocT.2l. ms.

Patented Dec. 7, 1920.

UNITED STATES PATENT OFFHCE...

GEORGE S. HILL, OF STRAFEORD, NEW HAMPSHIRE, ASSIGNOR, BY MESNE' ASSIGN- MENTS, T0 UNITED SHOE MACHINERY SEY, A. CORPORATION OF NEW JERSEY.

CORPORATION, OF PA'IERSON, NEW JER- TAKE-UP MECHANISM.

Application filed October 21,

T 0 all whom it may concern Be it known that I, Gnoncn S. HILL, a citizen of the United States, residing at Strafl'ord, in the county of Strafford and State of New Hampshire, have invented certain new and useful Improvements in Take- Up Mechanism; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to buttonhole sewing machines, and more particularly to take-up mechanism for such machines.

The object of the invention is to provide a novel and improved rotary take-up or thread-controlling mechanism which is well adapted for use in machines in which the sewing mechanism is rotated in sewing about the end or ends of the buttonhole, and which will act smoothly and efficiently when operated at high speed.

To this end the invention comprises the features of construction and combination of parts hereinafter described and referred to in the claims.

The various features of the invention will be readily understood from an inspection of the accompanying drawings, and the following detailed description of the mechanism illustrated therein.

In the drawings Figure 1 is a sectional elevation showing so much of a buttonhole sewing machine as is necessary to illustrate the application of the present invention thereto; and Fig. 2 is a detail front elevation showing the upper needle and take-up mechanism.

In the drawings the invention is shown as embodied in a buttonhole sewing machine having the same general construction and mode of operation as the machine shown and described in application Serial No. 104,449, filed June 19, 1916.

The machine comprises, in general, a cutter which operates to cut the buttonhole slit after the completion of the sewing, a reciprocating and laterally-moving work clamp, and a sewing mechanism which is rotated during the sewing about the eye of the buttonhole, and which comprises a verticallyreciprocating and late'rallywibrating or jogging upper needle, and looping and loopspreading devices including a thread-carrying looper arranged below the work and co- Specification of Letters Patent.

Patented Dec. '7, 1920.

1916. Serial No. 126,923.

forms no part of the present invention and which need not be described. The buttonhole slit is cut at the completion of the sewing by a cutter operated by a cam on the main cam shaft of the machine. The work is carried by the clamps over a throat plate 10 mounted upon a turret 12, which carries the under looping and loop-spreading mechamsm.

The upper needle 14 of the sewing mecha-' nism is eccentrically mounted in a hollow needle bar 16. The mechanism for vibrating or jogging the needle bar comprises a vertically-reciprocating and laterally-vibrating carrier sleeve 18, within which the needle bar reciprocates. The carrier sleeve is reciprocated vertically through a bellcrank lever 20, the horizontal arm of which is connected by a ball joint with the upper end of the sleeve, and the vertical arm of which is connected by a link 22 with an eccentric on the sewing shaft 24. The lower end of the sleeve is moved laterally by a link 26, one end of which is connected with a pivot 28 on a rotary head 30. When the sleeve is moved downward the link actsto swing the lower end of the sleeve and the needle bar toward the right so that the needle bar will be positioned for the depth stitch. When the sleeve is raised the link acts to swing the sleeve toward the left so that the needle bar will be positioned to form the slit or edge stitch. The needle bar is reciprocated by a crank 32 which is secured to the front end of the needle shaft 34 and is connected to the needle bar by a link 36. The needle shaft is geared to make two revolutions for each revolution of the sewing shaft, and the needle carrier will therefore be moved to the right during one reciprocation of the needle and to the left during the succeeding reciprocation, so that the needle will vibrate or jog so as to alternately form the depth and edge stitches.

The rotary head 30, in which the carrier sleeve and needle bar are carried, and the rotary turret 12, in which the looper mechanism is carried, are rotated in unison during the sewing about the eye of the buttonhole through shafts 38 geared to the head and turret, and operated by connected gear segments 40, one of which is provided with an arm carrying a roll engaged by a cam on the main cam-shaft of the machine.

In embodying the present invention in the machine above described, a rotary take-up mechanism for taking up and controlling the upper needle thread is combined with the stitch-forming mechanism, and this take-up is preferably arranged above the needle bar so that the thread may lead from the take-up directly to the upper end of the bar. The term rotary take-up is used herein to define a takeup which rotates in the same direction in taking up and giving out the thread, as distinguished from oscillating take-ups which move in opposite directions in taking up and giving out the thread. As shown, the take-up comprises two disks 42, which are spaced to provide a thread-guiding passage between them and are connected by a screw-stud 44 which also acts as a take-up crank pin for engaging and operating upon the upper needle thread. The disks are also connected by a second screw-stud 46 which is arranged substantially in the axis of the take-up. This central stud may be, and preferably is, arranged slightly eccentric to the axis of the take-up so that it will modify the action of the take-up pin 44 as it begins to take up the needle thread during the upward stroke of the needle and as it ceases to act upon the thread durin the downward stroke of the needle. The inner disk 42 of the take-up is secured to or formed on the end of the needle-driving crank pin 32, so that the take-up is secured to and rotates with the needle shaft. The thread leads from the eye of the needle, through a light tension device 48 mounted on the side of the needle bar, up through the hollow needle bar, over the take-up pin 44, from which it leads under a thread uide 50 to a tension device 52,

and thence t rough suitable guides to the thread supply. 7

With the above construction and arrangement the needle thread is smoothly and uniformly taken up and controlled without complication of the parts and without sudden or violent strains or pulls on the thread.

While it is preferred to employ the specific construction and arrangement of parts shown and described, especially in embodying the invention in the machine of the application above referred to, it will be understood that this construction and arrangement is not essential to the broader features of the invention, but may be varied or modified as found desirable orbest suited to the construction and arrangement of the parts and mechanisms of the machine in which it is to be embodied.

Having explained the nature and object of the invention, and specifically described one form of mechanism in which it may be embodied, what is claimed is:

1. A sewing machine, having, in combination, a work clamp, a stitch-forming mechanism comprising an upper needle bar and needle and a complementary under thread mechanism, rotary supports in which the stitch-forming mechanism is mounted, a rotary take-up acting on the upper needle thread adjacent to the needle bar, and mechanism for relatively actuating the stitchforming mechanism and work clamp to sew about a buttonhole.

2. A sewing machine, having, in combination, a work clamp, a stitch-forming mechanism comprising a vertically-reciprocatlng hollow needle bar and a complementary under thread mechanism, a rotary takeup above the needle bar from which the thread leads directly into the bar, and mechanism for relatively actuating the stitchforming mechanism and the work clamp to sew about a buttonhole.

3. A sewingmachine, having, in combination, a stitch-forming mechanism comprising a vertically-reciprocating upper needle bar, a rotary support for the bar, and a rotary take-up acting on the needle thread above the needle bar. e

4. A sewing machine, having, in combination, a stitch-forming mechanism comprising a verticallyreciprocating hollow needle bar, and a rotary take-up above the bar from which the thread leads directly into the bar. e

5. A sewing machine, having, in combination, a stitch-forming mechanism comprising a vertically-reciprocating -upper needle bar, a crank for reciprocating the bar, a take-up secured to the crank above the needle bar and provided with a take-up crank stud. p

6. A sewing machine, having, in combination, a stitch-forming mechanism comprising a vertically-reciprocating and laterally-vibrating needle bar and a complementary under thread mechanism, and a rotary take-up for the needle thread arranged above the needle bar.

7. A sewing machine, having, in combination, a stitch-forming mechanism comprising a vertically-reciprocating needle bar, a crank for reciprocating the-bar, takeup disks secured to the crank above the needle bar, a take-up crank pin between the disks, and a substantially central pin between the disks.

I GEORGE S. HILL.