US477433A

US477433A - Rotating hook mechanism for boot or shoe sewing machines

Info

Publication number: US477433A
Authority: US
Publication date: 1892-06-21
Anticipated expiration: 1909-06-21

Description

2 Sheets-Sheet 1.

(No Model.)

I). MILLS. ROTATING HOOK MECHANISM FOR BOOT OR SHOE SEWING MACHINES,

P az'e nt eq June 21, 1892.

(No Model.) 2 Sheets-Sheet 2.

D. MILLS. m ROTATING HOOK MECHANISM FOR BOOT 0R sHOE SEWING MACHINES. No. 477,433. Patented June 21, 1892.

UNITED STATES PATENT Grrrcn.

DANIEL MILLS, OF PHILADELPHIA, PENNSYLVANIA.

ROTATING HOOK MECHANISM FOR BOOT OR SHOE SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 477,433, dated June 21, 1892. Application filed October 6, 1891. Serial No. 407,939. (No model.)

To all whom it may concern:

Be it known that I, DANIEL MILLs, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Rotating Hook Mechanism for Boot or Shoe Sewing Machines, of which the followingis a specification.

My invention relates to improvements .in machines whose general character is set forth in my United States Patents Nos. 93,731, 96,944, and 97,951, of 1869, No. 101,644, of 1870, and No.127,123, of 1872, and English Patents No 1,237 of 1870, Nos. 937 and 2,899 of 1871, No. 4,279 of 1875, and No. 1,160 of 1876. The machines described in the specifications of said Letters Patent are designed for sewing a welt to the insole and upper for stitching the outsole to the welt, and also for sewing the soles to the uppers of turned shoes, no one of the machines, however, being adapted for the proper performance of all of these different classes of work. The characteristic features of the mechanism in said machines are a curved needle which has a reciprocating motion or partial rotation to and fro around an axis and operates either with or without an awl and with a needle-shield, a looper, a feeddog, a back or bottom gage, and in the case of the lock-stitch machines with a discoidal bobbin, a hook for carrying the thread over the same, and other devices actuated by suitable cams, the whole of the mechanism being supported in a strong head placed on a stand in sucha manner as to permit the workto be properly presented to the sewing mechanism.

My present invention relates to a machine for performing all of the different kinds of work above noted, the improvements having especial reference to the mechanism for rotating and longitudinall moving the hook which carries the loop of needle-thread over the discoidal bobbin, and said improvements comprising mechanism for imparting to the hook intermittent movements of rotation in the same direction and for locking itbetween such movements; also means for imparting the lateral movement to the hook-shaft, and permitting the adjustment of the hook from or toward the needle; and also means for starting the rotation of the hook-shaft by a gradual or accelerating motion, so as to prevent shock or jar in the movement of the same or in the action of the gearing for operating it.

In the accompanying drawings, Figure 1 is a front view of sufficient of the machine to illustrate the invention, the parts to which the invention relates being shaded to give them greater prominence. Fig. 2 is a transverse section on the line 1 2, Fig. 1, looking in the direction of the arrow 1. Fig. 3 is an end view looking in the direction of the arrow 2; and Fig. 4. is a transverse section on the line 3 1, Fig. 1, looking in the direction of the arrow 3. v

The two parts A A of the head are bolted together and have bearings for the drivingshaft 0, which carries the various operatingcams of the machine, Z1 being the vibrating needle-lever; d, the needle-shield; e, the feeddog; f, the feed back gage; f the needle back gage; j, the rotating hook, and k the discoidal bobbin.

The intermittcntly-rotating hook 7' for carrying the thread around the bobbin 7c is secured to the front face of the hook-shaftj and on said hook-shaft 3' is a spur-gear 7' which is provided with a certain number of teeth and a concave blank space 7' the radius of the blank space corresponding with the convex radius 3' of the driving-disk B on the shaft 0. (See Figs. 2 and 3.) The disk B is provided on its periphery with a number of teethj equal in number to the number of teeth in the hook-shaft spur-gearfi, so that as the said disk 13 is continuously rotated intermittent forward rotating movements will be imparted to the hook-shaft and the latter will be locked between such movements by reason of the engagement of the curved face of the disk B with the concave face J of the hook-shaft spur-gean In order to prevent the wearing of the parts and the noise which would result from the direct engagement of the rotating spur-segment j with the pinion 7' while the latter is at rest, I impart movement to said spur-pinionj before the spur-teeth j reach such position as to intermesh therewith, this movement being effected by means of a lever j, hung to a stud 7' on the frame and adapted to act upon. a lug or projection j on the face of the pinion 3' this lever having an anti-friction roller j, acted upon by a cam j, Fig. 2, and by a spring j, which serves to hold the levcrnormally in position for the action of said cam. Just before the first tooth of the spur-segmentj reaches a position to strike the end of the concave portion of the pinionj the leverj is acted upon by the cam 9' and in turn acts upon the lug or projection j of the pinion 7' so as to impart a slight forward motion thereto, such motion being permitted, owing to the fact that there is in advance of the first tooth of the segment j a recess j". The cam j is so formed that the first movement imparted to the lever j is a slow and gradual movement, which rapidly increases in speed after the lever is in contact with the stud 9' so that, while the lever is brought slowly into contact with said stud and starts the movement of the pinion j slowly, the movement of said pinion is accelerated after the start, and by the time the spurj begins to mesh with the pinion the latter is traveling at the same surface speed as the spur-segment. Hence the movement of the hook is started easily and gradually and without any jerk or noise. To still further lessen the tendency to noise, the concave portion j of the pinion j is composed in part of a rawhide block f and when, after the rotation of the pinion f, the concave portion of the same is brought into position to receive the convex portionj of the drive-disk the block 9' prevents any noise, such as would be caused if the convex surfacej and concave surface 9' were both wholly of metal.

The hook-shaft 7' has a motion toward and from the needle, so that the hook will approach to the center of the needle-path to catch the loop of needle-thread and will then be withdrawn to its normal plane of rotation, and this lateral movement of the hook-shaft is effected by means of a camj, formed upon the shaft, as shown in Fig. 1, said cam engaging with a tongue or finger f, which is carried by a set-screwy" adapted to a threaded opening in the side of the head, a second setscrewj being adapted to a threaded opening in the fingerj and being seated in a recess in the head, as shown in Fig. 1, so that it not only serves to hold the fingerj and prevent it from turning when the scrcwj is turned, but also serves to lock the finger 7' longitudinally-that is to say, in the direction of movement of the hook-shaft. Hence the said finger is rigidly held in position. By manipulating the set-screws, however, the fingerj can be very accurately adjusted, so as to eifecta correspondingly 'accurate adjustment of the hook-shaft and its hook, and thus cause the latter to work up to the center of the needlepath whatever the size of the needle may be, this movement of course being entirely independent of and having no elfect upon the inand-out movement of the hook-shaft, due to the engagement'of the cam j with the finger. By imparting an intermittent rotating movement in the same direction to the hook,

whereby the thread is passed over the bobbin, I am enabled to operate the machine more rapidly than those in which a vibrating or back-and-forth movement is imparted to the hook, as no time is lost while the hook is receding to its first position after passing the thread over the bobbin. intermittent rotating movements always in the same direction, moreover, causes less wear of parts and less noise than avibrating hook.

The hook-shaft spur-pinion is made hollow or recessed at the face for the reception of the bobbin-holder which has a spindle k extending through the hook-shaft and held at the rear end by an arm 70 secured to the frame A by a set-screw k (See Fig. 3.) Through the spindle k extends a pin 79 which has near its front end a collar is" and at the rear end a pin 71: which is adapted to the slotted arm of a lever k hung to a pin 70, and acted on by aside cam 70 and by a spring 70, as shown in Fig. 1. A longitudinal reciprocating movement is thus imparted to the pin 70 and the collar k of the same is caused to press the bobbin 7a firmly against the retainer-plate Zwhile the rotating hook is first applying the loop of needle-thread to the bobbin, the subsequent retraction of the pin 76 permitting the bobbin to lie loosely between the bobbin holder and retainer, so that the loop can be readily drawn over the bobbin.

The mechanism for operating the needle, awl, needle-shield, feeding, and work-supporting devices, pull-back, 850., form the subject of separate applications filed by me of even date herewith, Serial Nos. 407,943, 407,941, and 407,940. Hence these parts are not referred to at length in this specification.

Having thus described my invention, I claim and desire to secure by Letters Patent-- 1. In a boot and shoe sewing machine, the combination of the needle, the bobbin, the hook, the hook-driving mechanism for intermittently rotating said hook in the same direction around the bobbin, and mechanism for longitudinally reciprocating the hookshaft in its bearings, substantially as specified.

2. In a boot and shoe sewing machine, the combination of the needle, the bobbin, the hook-shaftand its hook, a pinion on the shaft having alternating toothed portion and plain concave segment, a drivingearhaving alter nating toothed portion and plain convex segment for engaging With the toothed portion and concave segment of the pinion, and means for rotating said drivegear, whereby the hookshaft has intermittent forward movements of rotation around the bobbin, with periods of dwell during which it is locked, substantially as specified.

g 3. In a boot and shoe sewing machine, the combination of the needle, the bobbin, the hook-shaft and its hook, a spur-pinion. on said hook-shaft, the spur scgment for-engagement with said pinion, and a lever and cam where by the initial movement is imparted to the The hook having hook-shaft before the driving-spur segment engages with the pinion on said shaft, substantially as specified.

4;. In a boot and shoe sewing machine, the combination of the needle, the bobbin, the hook-shaft and its hook, a spur-pinion on said hook-shaft, a driving spur-segment, and a lever and cam for starting the movement of the hook-shaft independently of said spur-gears, said cam having a differential pitch, substantially as specified.

5. The combination of the needle, the ro- I tating hook, the hook-shaft free to slide in its bearings and having a cam, a stud or finger engaging With said cam, and screw-stems for adj usting and locking said stud or finger, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

DAN L. MILLS.

Witnesses:

EUGENE ELTERIoH, HARRY SMITH.