US471494A - Sewing-machine - Google Patents

Description

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Fig. 11 represents a sectional view on the NITED STATES FFICE. I

PATENT IVILLIAM Y. OBER, OF LYNN, MASSACHUSETTS, ASSIGNOR TO THE BOSTON YVELT MACHINE COMPANY, OF PORTLAND, MAINE.

SEWING-MACHINE.'

SPECIFICATION forming part of Letters Patent No. 471,494, dated March 22, 1892. Application filed July 23, 1891. Serial No. 400,441. (No model.)

To all whom it may concern.-

l 3e it known that I, WILLIAM Y. OBER, a citizen of the United States, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented new and useful Improvements in VVelt-Sewing Machines, of which the following, taken in connection wlth the accompanying drawings, is a specification.

This invention relates to improvements in welt-sewing machines; and it is carried out as follows, reference being had to the accompanying drawings, wherein- Figure 1 represents a side elevation of the complete machine, showing the needle in position during the first part of the stroke. Fig. 2 represents a side elevation of the machine as seen from the opposite side of Fig. 1, the pulley and driving wheel being removed. Fig. 3 represents a cross-section on the lineX X, shown in Fig. 2. Fig. 4 representsa front elevation of the machine with the parts in the same position as shown in Figs. 1 and 2. Fig. 5 represents a vertical section on the line Y Y, shown in Fig. 4.. Figs. 6 and 7 represent detail sectional views of the thread-guide mechanism. Fig. 8 represents a side elevation similar to Fig. 1 and showing the needle in its lowest position. Fig. 9 represents a top plan View of the machine, a part of which is shown in section; and Fig. 10 represents a cross-section on the line Z Z, shown in Fig. 9. line W W in Fig. 8, showing the adjustable crank for oscillating the needle-carrier.

Similar letters refer to similar parts wherever they'occur on the different parts of the drawings.

In carrying out this invention I make use of the following essential parts, namely:

First. An oscillating open-eyed curved and pointed needle, which serves also as an awl for thepurpose of penetrating the work and carrying the thread through it during the sewing operation. The said oscillating needle is mounted on the upper end of a rocker armor lever pivoted to the head of the machine and rocked by means of a cam on the rotary drivingshaft and connecting mechanism, as will hereinafter be more fully described. By such cam and rocker-lever and needle the feed of the material being sewed is accomplished.

Second. A cast-off havinga grooved portion inclosing the needle, said cast-off being mounted on the same spindle on which the needlecarrier is oscillated, and it is operated by said needle-carrier and provided with a friction device for holding it at the ends of its stroke after being moved by the needle-carrier.

Third. An oscillating thread-guide. disk having a central perforation for receiving the needle and a side perforation through which the thread is guided, said thread-guide being operated by a segment-gear on the lever, which actuates the needle to feed the goods.

Fourth. A stationary presser-foot or chan the cord or belt pulley B, to which a rotary motion is imparted by the usual means.

B" is a balance-wheel on the shaft B, as usual.

The shaft B is preferably journaled in a sleeve 0, secured in the bearing-piece A", that forms a part of the head A, as shown in Fig. 10.

The mechanism for imparting'an oscillating motion to the needle is constructed as follows: In a groove in the end of the drivingshaft B is adj ustably secured a crank-plate I), having a slot 1), through which passes the screw-bolt b", which is screwed into the end of the shaft'B, as shown in Figs. 10 and 11.

b is a ball-crank on the adjustable plate I), to which is universally jointed the lower end of link D, as shown in Figs.10 and 11. By means of the screw 1) and slotted plate b the ball-crank b may be adjusted to and from the center of the driving-shaft B, according to the amount of rocking motion desired to be given to the needle-carrier and its needle. By having the link D universally jointed on the ballcrank, as described, the needle-carrier operated by said link may be freely moved in the line of feed of the work in asiinple and practical manner and with as few connecting parts as possible. The upper end of the link D is pivoted at cl to the needle-carrier E, which is hung on the pin f, secured to the upper end of the rocking feed arm or lever F.

e is the curved open-eyed and pointed needle, secured in a suitable manner to the needle'carrier, as shown in the drawings.

The mechanism for imparting a feed motion to the needle is constructed as follows: Upon the shaft 13 is secured a cam G, having a groove g, adapted to receive a pin or roll it on the lever H, which is secured in its lower end to a shaft II, journaled in the head A, as shown in Fi 5. In one piece with or secured to the forward end of said shaft II is a lever ll", having a sloth, in which is adjustably secured the stud or pin h. The needle feed arm or lever F is pivoted at F to the head A and is provided with a groove or slotf' in its lower end, adapted to receive the pin it on the lever H, as fully shown in Fig. 5. It will thus be seen that an oscillating feed motion is imparted to the needle-carrier and its needle by said cam G and connecting mechanism to the lever F, on which the needle-carrier is hung, as hereinbefore mentioned. By adjusting the pin 7t up and down in the slotted lever 11 the amount of feed is regulated.

The mechanism for operating the cast-off from the needle-carrier is constructed as follows: The cast-off device is made in the form of a disk I, mounted loosely on the pin f between the needle-carrier E and the needle feed-arm. F, said disk having a forked cast-oil": I, embracing or surrounding the needle 6, as shown.

The cast-off is operated by the needle-carrier as follows: E is a curved slot in the needie-carrier E, in which is adj usiably secured a screw-bolt E", having a head or projection E on the inside of the needle-carrier, as shown in detail in Fig. 3. The cast-oft plate I has at one place on its periphery an elongated notch or recess 1', adapted to receive the head or projection E on the needle-carrier. By this arrangement an intermittent rocking motion is imparted to the cast-oif by the needlecarrier.

In machines of this kind it is essential that the cast-off should be frictionally held at the opposite ends of the stroke to allow the needle to move independently of the castoff, and for this purpose I make use of a frictionblock K, inserted in a recess or perforation in the arm F, as shown in Fig. 9, said block being held in frictional contact with the cast-off plate, preferably by means of a compressible spring K and adjusting-screw K, as fully shown in said Fig. 9.

The thread-guide mechanism is constructed as follows: The thread-guide is composed of a gear or toothed disk L, adapted to oscillate in a bearing L, secured to the feed-arinF. Said gear or disk L has a central perforation L through which the hooked endof thencedle passes while receiving a loop in its barb or hooked end, the thread on during such operation being guided through a perforation l in the thread-guide L, as shown in Figs 6 and 7.

An oscillating motion is imparted to the thread-guide L by means of a gear N,having its teeth meshing in the teeth of the thread guide L. Said gear N is secured to a shaft N, journaled in bearings in the feed arm F, and has secured to its other end apinion N the teeth of which mesh in the teeth of a segment-gear H secured to or forminga part of the upper end of the rock-lever II, as shown in Figs. 1, 2, 5, 8, 9, and 10.

O is the stationary presser-foot or channelguide, adapted to be inserted in the channel of the insole during the sewing operation. The said presser-foot is adjustably secured (preferably by means of a binder-screw O )to the arm or bracket 0'', so as to enable the presser-foot to be adjusted up or down or inclined, more or less, as may be desired, according to the nature of the work that is to be done. The arm or bracket 0 is secured to the head A and made capable of a forwardand-back adjustment, by which the presser foot secured to it is also made ad ustable to and from the work -support. Such ad ustment may be accomplished in various ways without departing from the essence of my invention. In the drawing Fig. 2 I have shown for this purpose screw-bolts O 0, one of which goes through aslot in said bracket 0 andis screwed into the head A and the other going through a slot in said head and screwed into the bracket 0'', as fully shown in Fig.

l? is the work-support, secured in a suitable manner to the under side of the feed-arm h and moving with the latter.

In Fi 1, Q is the wax-pot, as usual, through which the thread in is guided on its way to the thread-guide, and for the purpose of preventing said thread from com ng in contact with the pinion N, I arrange in front of and above the latter a guard M, as shown in Figs. 1, 2, 5, 8, and 10. Any suitable or wellknown tension and take-up device may be used in connection with the machine, and need not here be described in detail, as it forms no essential part of my invention.

In Fig. 2 the work-support P has alateral perforation adapted to receive and guide the welt in while being stitched on, as is usual in devices of this kind.

The operation of the machine is as follows: For welt-sewing the welt is placedin its gu de and the lasted shoe having the channeled ii sole, as usual, is held by the operator in position, so that the shoe-upper rests against the work-support and the bottom of the channel in the insole against the lower end of the sta tiouary resser-foot or channel-guide, after which the machine is set in operation, cans ing a single chain-stitch to be' made through the bottom of the channel of the insole, the upper, and the welt, the chain of the stitch being laid in the bottom of the channel, and during such operation the needle enters and perforates the insole, upper, and welt, then feeds by moving sidewise, and during such feed motion of the needle the thread-guide lays a loop in the barb ot' the needle, after which the needle draws the loop of the thread through the work and returns with said loop to its original position, and so on during the operation of sewing the welt to the upper and insole, the cast-oft co-operating with the needle, as usual, to form a chain-stitch in the ordinary manner.

When it is desired to use the machine for sewing turned shoes, in which case no Welt is used, the operation is similar, but the weltguide and welt are omitted.

That I Wish to secure by Letters Patent, and claim, is

1. In a sewing-machine, the combination, with an oscillating needle-carrier and needle pivotally mounted upon a rocker feed-arm, of

a rotary driving-shaft having a groove in one end, a slotted plate adj ustably secured in said groove and provided with a ball-crank, and a link having one end universally jointed on said ball-crank and its other end pivotally connected to the needle-carrier, substantially as described.

2. In a sewing-machine, an oscillating needle-carrier and a cast-off plate pivoted upon a rockerfeed-arin, said needle-carrier having a projection adapted to intermittently rock the cast-oft,and an adjustable spring-pressed friction-block adapted to bear against the cast-0E plate, substantially as and for the purpose set forth.

In testimony whereof I have signed .my name to this specification, in the presence of two subscribing Witnesses, on this 22d day of June, A. D. 1891.

WILLIAM Y. OBER.

WVitn esses 2 ALBAN ANDREN, ALICE A. PERKINS.

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