US2045644A - Sewing machine - Google Patents

Description

Mme. 30, 1936. .o. RJHAAS SEWING MACHINE Original Filed April 21, 1932 5 Sheets-Sheet 1 (Ittomegs June 3@, 1936. v 0 R HAAS I 2,045,644:

' SEWING MACHINE ed April 21, 1952 5 Sheets-Sheet 2 Original Fil l'mnentor attorney;

June w, 1936.

5 Sheets-Shee t 5 3nnento1:

' (lttornegs o. R. HAAS SEWING MACHINE 5 Sheets-Sheet .4

Original Filed April 21, 1932 (Ittomegs 0. R. HAAS SEWING MACHINE 5 Sheets-Sheet 5 Patented June 30, 1936 HTED STATES SEWING Otto R. Haas, North Beverly,

MACHINE Mass, assignor to United Shoe Machinery Corporation, Paterson,

N. l, a corporation of New Original application A 667,224. Divided and Jersey pril 21, 1933, Serial No. this application September 28, 1935, Serial No. 42,665

9 Claims.

The present invention relates to sewing machines, and is herein set forth as embodied in a lockstitch outsole shoe stitcher of the type described in the present inventors pending appli- 5 cations for U. S. patent Ser. No. 600,016, filed March 19, 1932, and Ser. No. 667,224 filed April 21, 1933, the present application being a division of the latter.

The object of the invention is generally to improve the construction andmode of operation of the stitch-forming devices of a sewing machine and particularly to provide a lockstitch outsole shoe sewing machine of the type mentioned which is more efiicient, reliable and uniform in operation as compared to prior sewing machines.

In the machine of the inventors prior application, Ser. No. 600,016, a stopping mechanism is provided to stop the machine with the needle and awl disengaged from the Work, and with the take-up moved from a maximum thread retracting position to a position where a part of the needle thread is yielded up as the machine comes to rest. In that machine the slack thread yielded up by the take-up during the final movements of the machine is likely to be withdrawn from the work support as the Work is being removed, so that upon starting the machine on a new shoe, the end of the needle thread extends from the first stitch so far as to require hand trimming with resulting waste of thread.

According to a feature of the present invention, means is provided in a sewing machine arranged to operate in the manner just described, for preventing the thread from being withdrawn after the machine is brought to rest. In the present form of the machine, an additional movement is imparted to the take-up by connections to the stopping mechanism, so that substantially no slack thread is provided when the stopping mechanism has operated, and a complete seam will be formed which requires no hand trimming operation.

This and other features of the invention including certain novel and improved thread break indicating devices and novel and improved constructions and arrangements of parts are herein described in the following detailed specification, and are more particularly pointed out in the ap- 50 pended claims.

In the drawings, Fig. 1 is a View in front elevation of the sewing mechanism of a machine embodying the present invention with certain parts broken away or removed; Fig. 2 is a plan view partially in section and broken away on a reduced scale showing a part of the driving mechanism for the machine; Fig. 3 is a sectional view of the sewing mechanism taken along the line 3-3 of Fig. 1; Fig. 4 is a sectional view taken along the line 4-4 of Fig. 1, of a portion of the mechanism shown in Fig. 3, indicating the thread cutter in cutting position; Fig. 5 is a view in side elevation .on a slightly enlarged scale and partly in section of the mechanism shown in Fig. 3, looking from the opposite side of the machine; Fig. 6 is a plan view partly in section along the line 6-6 of Fig. 5 showing a part of the take-up actuating mechanism; Fig. 7 is a sectional view in elevation of some of the take-up parts shown in Fig. 6; Fig. 8 is a side view partly in section taken along the line 88 of Fig. '7, showing more particularly the relations of the parts upon the occurrence of slack or broken thread; and Fig. 9 is a view similar to Fig. 8 showing the position of the parts during sewing.

Referring to the drawings, the frame of the machine comprises a main base 2, (see Figs. 1 and 2) a frame 4' anism and supporting a motor, and a frame 6 supporting the sewing mechanism. The motor drives the machine through a vertical shaft 8 arranged to rotate continuously while the motor is running. The mechanism in the base 2 and the sewing mechanism are driven by suitable gearing mounted within the frames fromthe continuously rotating shaft 8 through a clutch comprising a driving member I0 (see Fig. 3) and a driven member I 2.

The sewing mechanism of the machine, as illustrated, is arranged to stitch the outsole to a lasted shoe, the shoe being operated upon being indicated at M in Fig. 4 of the drawings.

The sewing mechanism is operated from a sewing cam shaft I6 rotated from the driven clutch member l2 through a pair of helical gears l8 and 20 attached to the clutch member and to the cam shaft, respectively. When it is desired to stop the machine, the driven clutch member I 2 is disengaged from the driving clutch member I 0 by a driving and stopping mechanism comprising in part a bell-crank 22 secured to a shaft 24 in the frame 4, and. rocked in a counter clockwise direction, as viewed in Fig. 3 through the engagement of a bolt 26 on one arm of the bellcrank with a cam slot 28 in a sleeve attached to the driven clutch member l2. The return move ment of the shaft 24 and the bell-crank 22 in a clockwise direction is prevented by a latch 30 which engages the vertical arm of the bell-crank and causes the clutch to containing the power driving mech.

be disengaged by the action of the cam slot 28 on the bolt 26 in the horizontal arm of the bell-crank 22.

The thread is severed at the end of a seam by a thread cutter indicated at 32, of the same construction and mode of operation as that described in inventors co-pending application for Shoe sewing machine, Serial No. 651,803, filed January 14, 1933, in which a knife is projected against and enters beneath the surface of the shoe sole while the shoe is held in operative position, so as to sever the threads with the ends remaining in engagement with the work, as shown in Fig. 4.

After theoperations on the shoe are completed and the machine is brought to rest, a new shoe having been substituted for the one on which the operation is complete, the machine is again started by engaging the driven clutch member I2 with the driving clutch member I0. To cause the movement of the driven clutch member against the driving clutch member, a power driven shaft 34 (Fig. 2) having a crank portion 36 connected by a pitman and other suitable means to release the bell-crank 22 from the latch 38 is caused to rotate through one complete revolution by the manipulation of a starting handle 38.

The stitch forming and work feeding devices of the machine include a curved hook needle 48, a curved awl 42, a looper 44, a shuttle or loop taker 46, a main take-up 48, an auxiliary take-up 50, a thread finger 52, a needle guide 54, a work support 56, a presser foot 58, and a feed slide on which certain of the stitch forming devices are carried. The stitch forming and work feeding devices operate with a continuous feeding movement to form a lockstitch seam, and at the end of the operation, the stopping mechanism including the bolt 26 on the bell-crank 22 and the cam slot 28 in the driven clutch member I2 are arranged to bring the sewing mechanism to rest at a definite point with the needle and awl disengaged from the work. To permit the stitchforming devices to operate at high speeds, the timing is so arranged that the awl enters the work after the needle has withdrawn with its loop of thread and while the needle thread is being interlocked with the locking thread by the shuttle. With this system of timing, it is necessary to cause the looper to misloop the needle in bringing the machine to rest after the last needle loop has been drawn down into the work in order that the machine may stop with the needle free of thread and at a point in the cycle of operations in which, when the machine is again started, the awl will enter the work before the needle.

The take-up operates to draw the needle loop with the locking thread towards the work, and to set the stitch during the final thread retracting'movement of the take-up. The position of the lock between the threads in the work is determined by the amount of thread withdrawn from the shuttle. All of the operations and mechanism thus referred to are substantially the same, except as hereinafter described, as in the machine of the inventors applications Ser. Nos. 600,0l6and 651,803.

At the end of the sewing operation after the thread cutter 32 has acted and the shoe is being moved away from the work support, the frictional engagement of the ends of the threads and particularly the end of the needle thread, indicated at 62, (Fig. 3) in the work tends to cause the threads to be drawn with the shoe. The action of the needle thread tension, indicated at 64 is sufficient to prevent drawing an unlimited amount of thread from the needle thread supply, However, with the use of the timing referred to, and" the present stopping mechanism, the main take-- up is actuated during the final movements of the machine to give up a certain portion of the thread. Due to the failure of the looper to loop the needle on the last cycle of the machine, a supply corresponding to the thread releasing movement of the take-up may be withdrawn from the work support with the shoe after severing the threads. As the machine is started on a new shoe, the'amount of thread attached to the first stitch, unless otherwise taken up, may be so long as to require trimming after the shoe is removed from the machine.

In order to prevent a substantial length of needle thread from being withdrawn from the work support at the end of a seam by frictional engagement with the shoe sole, an extra movement, according to the present invention, as will be hereinafter more to the take-up during the final movements of the machine so as to bring it into a position substantially the same as its position during sewing in which the maximum amount of thread is retracted. This position may be suitably regu' lated to cause the exact amount of thread required for the initial stitch in a new seam to be retained on the Work support after the shoe isremoved.

The means for actuating the take-up 48 during; sewing comprises a cam actuated lever 66, ful-' crumed on a shaft 68 provided with a gear segment I0 on one arm cooperating with a segment '52 fixed to a shaft I4 on which the take-up is secured. The shaft sleeve I6 (see Fig. 6) arranged to slide along an arcuate slot "I8 in the frame of the machine. The sleeve I6 is retained within the slot by a curved cover plate secured at its ends to the portion of the frame in which the slot is formed. The surfaces of the slot are arranged concentrically with the shaft 68 about which the segment 'I0 is oscillated, so that movement of the sleeve I6 supporting the shaft 14 will not cause the segment 12 to be disengaged from the segment I0. During the sewing operation of the machine the sleeve I6 is retained at the upper end of the slot I8 and the take-up 48 is oscillated by the shaft 14 in the usual manner. At the end of the sewing operation, a set of connections actuated from the stopping mechanism is operated to move the sleeve 16 towards the lower end of the slot I8 causing the segment 12 to oscillate the take up 48 to a position substantially corresponding to the extreme position of the take-up during sewing.

The connections to the stopping mechanism for causing the take-up to be retained in its maximum thread retracting position, as the machine is stopped, comprises the shaft 24 of the stopping mechanism, a block 82 (see Figs. 1, 2, 3 and 6) mounted on the end of the shaft, a block 84 mounted on a shaft 86 and coupled to the block 82 by a tongue and groove connection, a gear segment 88 (see Fig. 2) fixed to the other end of the shaft 86 and a segment 90 on one arm of a U-shaped lever 92 fulcrumed loosely on a horizontal shaft 94 at the back of the machine. The U-shaped lever 92 is connected with a sleeve 96 surrounding the shaft 94 and carrying an arm by means of a clamp bolt I00.

a pivot block I02 slidingly arranged on the upper end of a rod I04 pivotally connected at its lower end to a pivot I06 of a toggle connected for operating the sleeve I6.

The arm 98 carries fully described, is imparted I4 is rotatably mounted in a thread retracting 98 secured thereto The sleeve 16 is secured at its ends to a pair of links I08 and H0 (see Fig. 6), the link I08 being loosely mounted on the shaft 68 for the take-up actuating lever 66 and the link I I0 being mounted upon a threaded stud- I I2 supported by a lug on the frame of the machine. The links I08 and H0 are connected together between their ends by a shaft II4 to cause them to move together, and their position is controlled by the movement of the toggle comprising a link H6 and a lever H8. The lever H8 is mounted on a shaft H9 in the frame and is pivotally connected with the link II6 by the pivot I06 which passes through the lower end of the link I04. When the rod I04 is moved upwardly by the engagement of the block I02 with a nut I20 on the rod I04 through the action of the connection to shaft 24 of the stopping mechanism in bringing the machine to rest, the alinement of the toggle links is broken (see Fig. 4) causing the take-up to move to its lowermost position. The connections are maintained in this position by a compression spring I2I acting between one arm of the lever H8 and a pivot I22 rotatably mounted in a portion of the frame 6 to provide a snap action to the toggle movements. The spring I2I surrounds a rod I24 secured at one end to the pivot I22 and slidingly arranged in a transverse opening through a pivot I26 mounted in a downwardly curved arm of the lever II8 against which the spring I2I bears. The toggle is maintained in a definite broken position by contact of one arm of the toggle lever I I8 with an adjustable set screw I21 threaded into a lug extending from the link H6. The final stopping position of the take-up and therefore the amount of thread to be employed in forming the first stitch on a new seam may be regulated by adjusting the set screw I21.

When the machine is started, the starting handle 38 being actuated to cause the crank shaft 34 to rotate, the sleeve 16 for supporting the takeup shaft I4 is moved to the upper end of the slot 78. The connections for so moving the sleeve 16 comprise an eccentric I 28 on one end of the shaft 34, an eccentric strap I30 surrounding the eccentric, a link I32 connected between the eccentric strap and an arm I34 fixed to one end of the shaft 94 on which the lever 92 is mounted. Rotation of the crank shaft 34 in starting the machine causes shaft 94 to be rocked first in one direction and then the other and an arm I36 secured to the shaft is caused to engage the upper end of the rod I04, forcing the rod downwardly to move the toggle comprising the link H6 and the lever II8 into alinement. This movement causes the sleeve I6 to be shifted to the upper end of the slot I8 and to be held in this position by the snap action of the spring I2I while the machine is in operation.

In the machine described, some of the connections which operate simultaneously to move the sleeve 16 carrying the take-up shaft are also employed to cause the looper to misloop the needle after the last formed stitch. These connections operate in the same way as described in the machine of the inventors applications, above identified, and are arranged to be operated from an arm I38 extending from the U-shaped portion of the lever 92. The arm I 38 carries a perforated block I40 in which the upper end of a link I42 slides and movement is imparted to the link from the block by the engagementof the block with an adjusting nut I44 carried by the upper end of the link. Upward movement of the link I 42 causes the path of movement of the looper to be shifted disks are held in a position out of away from the path of the needle. The looper actuating connections are returned to normal sewing positions by downward movement of the link I 42. The link I 42 is moved downwardly by an arm I46 fixed to the shaft 94 between the arms of the U-shaped lever 92 and is rocked simultaneously with the movement of the arm I36 which returns the take-up to normal operating position.

To indicate by stopping the machine or otherwise, breakage of the needle thread as in the machine of the co-pending applications, an electrical switch is arranged to be operated jointly by the main and auxiliary take-ups. Due to the movements of the pivot shaft T4 of the main takeup on the machine frame, the switch and auxiliary take-ups are separately mounted and additional connections are provided for operating the switch from the main take-up.

The thread break indicating switch shown in Figs. 6 to 9, comprises a pair of rotatably movable segmental contact disks i 48 supported between insulating washers #50 carried by a sleeve I 52 and a movable contact I54 mounted on the auxiliary take-up 56. The movable fiat spring contact I54 when brought into engagement with the disks I48 causes the current to flow therebetween, and the disks I 48 are connected by a pair of sliding contacts I56 with conductors I58 leading to a suitable electro-magnetic device for actuating the stopping mechanism of the machine. The sleeve I52 carrying the contact disks I48 is rotatably mounted upon a shaft I60 mounted at one end in a slot in a plate I62 secured to the machine and the auxiliary take-up is rotatably mounted at the other end of the shaft. exerts a yielding tension on the thread and a spring I64 is connected from an arm of the takeup with the frame of the machine for this purpose. When the thread is broken or the tension released, the auxiliary take-up will move the contact I54 towards the vertical portions of the contact disks I48, but will not cause engagement therewith unless the main take-up is in its extreme thread retracting position. The contact engagement with the contact I54 by a spring I66 connected between an arm I68 extending from the sleeve I52 and the machine frame. The spring I66 acts to hold the arm I68 in engagement with a shoulder I10 on the frame and a portion of the arm extends into the path of movement of the main take-up 48 so that the main take-up will engage the arm I68 only in the maximum thread retracting position of the take-up.

When the take-up engages the arm I68 the contact disks are moved into a position in which the contact I54 may engage them. As the takeup moves to release the thread the arm I68 again engages the shoulder I10 causing the arm to remain at rest during the remainder of the machine cycle. With this construction the movement of the take-up pivot I4 at the end of the seam does not interfere with the operation of the thread break indicating switch.

The nature and scope of the invention having been indicated and a specific embodiment illustrating the several features of the invention hav ing been described, what is claimed is:

l. A sewing machine having, in combination, a work support, a presser foot, a needle, 2. take-up movable during sewing to take up and give up thread as the thread is passed through the work, and means acting to prevent the thread normally given up by the take-up during sewing from being withdrawn with the work as the work is The auxiliary take-up removed from the work support after the machine comes to rest.

2. A sewing machine having, in combination, a work support, a presser foot, a needle, a take-up, means for actuating the take-up during sewing to take up and give up thread as the thread is passed. through the work, and means for causing the take-up to be moved as the machine is brought to rest to a position in which the amount of thread taken up is substantially the same as at the limit of the retracting movement of the take-up during sewing.

3. A sewing machine having, in combination, a work support, a presser foot, a needle, a take-up, a shiftable pivot on the machine for the take-up, means for oscillating the take-up about its pivot during sewing to take up and give up thread as the thread is passed through the work, and. means for shifting the take-up pivot as the machine is brought to rest to prevent the thread normally given up by the take-up during sewing from being withdrawn from the work support.

4:. A sewing machine having, in combination, a frame, a needle, a main take-up, a shiftable pivot on the frame for the main take-up, means for oscillating the take-up about its pivot during sewing to take up and give up thread as the thread passes through the work, means for shifting the pivot for the main take-up at the end of the sewing operation, an auxiliary take-up, a shaft on which the auxiliary take-up is mounted, a thread break indicating device, operated in part by the auxiliary take-up and an arm connected to said thread break indicating device and arranged to contact with the main take-up to cause the indicating device to be operated by the joint action of both take-ups.

5. A sewing machine having, in combination, a needle, a main take-up, a pivot for the main takeup, means for oscillating the main take-up about its pivot during sewing to take up and give up thread as the thread passes through the work, an auxiliary take-up, a movable switch contact connected for movement with the auxiliary take-up, a second contact yieldingly retained in a position where it will not engage the first contact but movable into engagement with said first mentioned contact for indicating a thread break, and an arm mounted in a position to be operated by the main take-up towards a position in which said contacts may be engaged during a part of the movement of the main take-up and arranged to be held stationary in a position in which the contacts can not come into engagements during the remainder of the main take-up stroke.

6. A lockstitch shoe sewing machine having, in combination, a work support, a presser-foot, a needle, a take-up, a pivot for the take-up, a shiftable block on which the take-up pivot is mounted, means for oscillating the take-up about its pivot comprising a driving segment and gear teeth connected to the take-up to take up and give up thread as the thread is passed through the work, and'means for shifting the block relatively to the driving segment to prevent the takeup from giving up thread. as the machine is brought to rest.

'7. A sewing machine having, in combination, a work support, a hook needle, a needle looper, a take-up movable during sewing to take up and give up thread as the thread is passed through the work, and means acting when the machine is brought to rest to increase the amount of thread taken up by the take-up and when the machine is started to release the additional amount of thread taken up.

8. A sewing machine having, in combination, a

work support, a presser foot, a needle, a take-up movable during sewing to take up and give up thread as the thread is passed through the work, mechanism for starting the machine in operation, mechanism for stopping the machine, and connections actuated by the stopping mechanism to prevent the thread normally given up by the take-up during sewing from being withdrawn from the work support with the work as the work is removed from the work support after the machine comes to rest, and connections actuated by the starting mechanism to release the thread for continued operation of the machine.

9. A lockstitch shoe sewing machine having, in combination, a work support, a presser foot, a needle, a take-up, a pivot for the take-up, means for oscillating the take-up about its pivot comprising a driving segment and gear teeth connected to the take-up to take up and give up thread as the thread is passed through the work, a shaft on which the driving segment is mounted, an arm rotatable about the shaft for supporting the take-up pivot, and means for shifting the arm relatively to the driving segment to prevent the take-up from giving up thread as the machine is brought to rest.

OTTO R. HAAS.

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