US1880192A

US1880192A - Sewing machine

Info

Publication number: US1880192A
Application number: US479735A
Authority: US
Inventors: Erskine E Boyce
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-09-04
Filing date: 1930-09-04
Publication date: 1932-10-04
Anticipated expiration: 1949-10-04

Description

Oct. 4, 1932. E. E. BOYCE SEWING MACHINE Filed Sept. 4, 1950 2 Sheets-Sheet l BY ATTORNEY M 9- ga l Lf/d E. E. BOYCE SEWING MACHINE Oct. 4, 1932.

Filed Sept. 4-, 1930 2 Sheets-Sheet 2 I vs INVENTOR BY ffiJ/f/Nffi fiOYCf Patented Oct. 4, 1932 PATENT OFFICE EBSKINE E. BOYCE, OF GASTONIA, NORTH CAROLINA SEWING MACHINE Application filed September 4, 1930. Serial No. 479,735.

This invention is an improvement in sewing machines, and more particularly in tuft ing attachments for such machines.

One of the objects of the present invention is to materially simplify the mechanism and ease the operation of the parts forming the attachment for automatically producing a series of loops, in regular sequence, in sheeting or fabric, and to sever the loops, to

1 form a long pile. I

A further object is the provision of comparatively simple arg effective means for tufting sheeting or woven fabrics, to produce spreads, rugs and other articles, solely by mechanism.

In the drawings forming a part thereof:

Figure 1 is a side elevation, partly in section, of the head ofa sewing machine.

Figure 2 is a section on the line 2-2 of Figure 1.

Figures 3 and 4 are views of the lower part of Figure 1 showing the parts in other positions.

The present embodiment of the invention,

is shown in connection with the head 1 of a sewing machine, having the usual needlebar 2, needle 3, and presser foot 4. The needle has the usual eye through which passes the thread 5, which is thrust through the sheet.

The feed dog 6 is connected to a substantially Z-shaped link 7 one end of which is pivoted at 8 to an arm 9, on a shaft 10, and the other end of the link is pivotally connected to a strap 11 carried on a shaft 11 by an eccentric arranged below the feed dog and presser foot. Shaft 11 is rocked by a connection, not shown, from the usual wheel crank, not shown, at the opposite end of the 0 machine, and the eccentric aflixed to the shaft and which engages the strap 11 raises and lowers the feed dog 6 at the proper time.

v Shaft 10 is operated by mechanism, not shown, to give the feed dog its back and forth movement. The eccentric on the shaft 11 is timed in such a way as to raise the feed dog 6 at the forward end of the stroke imparted by shaft 10 and to lower the feed dog at the backward end of the stroke, thus "accomplishing the feeding motion.

The feed dog is connecteito the link as indicated at 12, and the shaft 11 carries a sickle shaped hook 13, which is adapted to pass through the loop of thread carried downwardly by the needle, as indicated in I6 Figure 1. A blade 14 is pivoted to the shank of the hook as indicated at 15, and a spring plate 16 is arranged on the pivot 15, the ilpllllilg acting to press the blade toward the When the shaft 11 is oscillated the feed dog is operated as previously explained, and the hook is oscillated. At the moment when the needle is at the limit of its downward stroke and starts to move upward, a somewhat open loop is formed in the thread, and at this time the bill of the hook 13 enters the loop. When the needle moves upward, the hook holds the loop, and passes through the loop, as far as the offset or shoulder 18 which is formed between the bill portion and the shank of the hook. This shoulder retains the 100 while it is being cut by the blade 14.

Iii will be noticed referring to Figures 1 and 4, that the blade has a tail 20 extending '15 on the opposite side of the pivot 15 from the blade, and this tail is adapted to engage a flattened abutment 21, on the underside of the feed dog, when the parts attain the position of Figure 4. This swings the blade which is the movable part of a shear, the fixed part bein constituted by that portion 22 of the hook s ank between the pivotal connection 15 and the shoulder 18. The cutting position is shown in (figure 4. Figure 3 8 shows the beginning of the movement of the hook, and Figure 4 the extreme position of the hook through the loop.

The operation is as follows:

Every time the needle descends the shaft 11 is oscillated to cause the bill of the hook to engage within the loop and hold it from retraction with the needle. When the loop passes to the shoulder 18, the movable blade of the shear operates to cut the loop. The movable shear blade is opened by engagement with a fixed abutment 23, connected to the table, the free end thereof being so positioned that the tail 20 strikes the said end when the hook.13 is at the limit of its movemo ment to the left in Figure The shear blade is moved in one direction, to cut, by the abutment 21, and in the opposite direction to open by the abutment 23.

What is claimed as new is 1. In a sewing machine of the class described, having a needlebar carrying a needle, a feed dog for advancing the fabric, and means for guiding the thread to the needle, a shaft mounted below the dog for oscillating movement, a sickle shaped hook secured to the shaft and adapted to pass through a loop carried downward by the needle, and a blade pivoted to the shank of the hook, said blade having a tail, and the feed dog an abutment for engagement by the tail to operate the blade when the hook is at the limit of its forward movement.

2. In a sewing machine of the class described, having a needlebar carrying a needle, a feed dog for advancing the fabric, and means for guiding the thread to the needle, a shaft mounted below the dog for oscillat ing movement, a sickle shaped hook secured to the shaft and adapted to passthrough a loop carried downward by the needle, and a blade pivoted to the shank of the hook, said blade having a tail, and the feed dog an abutment for engagement by the tail to operate the blade when the hook is at the limit of its forward movement, said hook carrying a cutting blade cooperating with the first named blade.

3. In a sewing machine of the class described, having aneedlebar carrying a needle, a feed dog for advancing the fabric, and

v means for guiding the thread to the needle, a

shaft pivoted below the dog, a sickle shaped hooked secured to the shaft and adapted to pass through a loop carried downward by the needle, and a blade pivoted to the shank of the hook, said blade having a tail, and the feed dog an abutment for engagement by the tail to operate the blade when the hook is at the limit of its forward movement, said hook carrying a cutting blade cooperating with the first named blade, said hook having a shoulder between the cutting blade and the bill of the hook to enable the hook to draw the loop rearwardly on its rearward movement.

4. In a sewing-machine of the class described, an oscillating loop engaging hook of sickle shape, including a shank and a bill, and

having a shoulder between the shank and the bill, facing away from the bill and on the concave edge of the hook, a blade pivoted to the shank and provided with a tail, and an abutment for engagement by the tail to operate the blade, the hook shank having a fixed blade in rear of the shoulder cooperating with the movable blade.

5. In a sewing machine of the class described including a movable feed dog, an oscillating loop engaging hook of sickle shape, including a shank and a bill, and having a shoulder between the shank and the bill, facing away from the bill and on the concave edge of the hook, a blade pivoted to the shank and provided with a tail, an abutment on the feed do for engagement by the tail to operate the blade, the hook shank having a fixed blade in rear of the shoulder cooperating with the movable blade, an oscillating shaft to which the hook is connected, and means for oscillating the shaft.

6. In a sewing machine of the class described, an oscillating loopengaging hook of substantially sickle shape and including a shank and a bill, said hook having a shoulder on the concave edge between the bill and the shank and facing the shank over which a loop may engage to prevent withdrawal from the hook, and means to shear the loop.

7. In a sewing machine of the class described, an oscillating loop engaging hook of substantially sickle shape and including a shank and a bill, said hook having a shoulder on the concave edge between the bill and the shank and facing the shank over which a loop may engage to prevent withdrawal from the hook, a movable blade pivoted to the shank and extending to the shoulder, said blade having a tail for engagement by a moving part to operate the blade, and the shank having a cutting edge to cooperate therewith.

8. In a sewing machine of the class described, an oscillating loop engaging hook including a shank and a bill, a movable blade pivoted to the shank and cooperating with.