US2209455A - Driving and stopping mechanisms - Google Patents

Description

y 0 1940- o. R. HAAs 55 DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1939 a Sheets-Sheet 1 .Ziaventbf Whzegg M X. Z/M

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July 30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1953 8 Sheets-Sheet 2 July 30, 1940. Q R HAAS 2,209,455

DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1958 8 Sheets-Sheet 3 July 30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1938 July'30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS 8 Sheets-Sheet 5 Filed Feb. 25, 1939 July 30, 1940. O R HAAS 2,209,455

DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1938 8 Sheets-Sheet 6 July 30, 1940. o. R. HAAS 2.209,455

muvme AND STOPPING MECHANISMS Filed Feb. 25, 1938 8 Sheets-Sheet 7 51233 30, 19 o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1938 8 Sheets-Sheet 8 L n L a a5 )1 I l A92 I fia/enwr Wnesa Patented July 30, 1940 2,209,455 'pmvnve AND s'rorrme MECHANISMS Otto R. Haas, North Beverly, Mass., assignor to United Shoe Machinery Corporation, Borough g! Flemington, N. J., a corporation of New ersey Application February 25, 1938, Serial No. 192,445 24 Claims. (Cl. 112-219) UNITED STATES PATENT OFFICE The present invention relates to shoe sewing machines; and more particularly to improvements in a sewing machine of the type illustrated and described in inventors co-pending application for U. S. Letters PatentSerial ,No. 76,924, filed April 29, 1936, upon whichPatentNo; 2,148,197 issued February 21, 1939, having stitchforming devices and driving andstopping mechanisms under the control of a manually operated foot treadle for either starting or stopping the stitch forming devices. 1

Shoe sewing machines in present commercial use in which the shoe is presented to a machine while held in the hands of the operator are arranged to be under constant control of the operator while sewing and to be brought to rest by the operator when a seam is completed, or at other times when the stitch forming devices operate improperly. Ordinarily. a shoe sewing machine is started by pressure of the operators foot on a control treadle and, when the machine is to be stopped, the pressure is released; In machines designed to operate at speeds much higher than ordinary, such as in the machine illustrated in the application above referred to, a number of cycles of operation may take place between the instant at which an improper operation occurs, and the time at whichthepressure on the foot treadle is relieved. One or more further operations also take place while the machine is' being stopped by the driving and stopping mechanisms. Unless the operator is exceptionally alert to breakage of thread, or to other improper operation, an excessive number of needle or awl perforations may be made in the work or the stitch forming devices may be damaged before the operator detects the difficulty. After the machine is stopped and again made ready for proper operation, the usual practice is to start the machine regardless of the alignment of perforations previously made in the work with the new work penetrating movements of the needle or awl, and as a result, the workalong a substantial proportion of the seam is weakened by additional perforations, and rendered unsightly in appearance. I

The objects of the present invention are to provide a novel and improved high speed shoe sewing machine of the type indicated in which a uniformly satisfactory seam is more easily formed than heretofore and in which the diiliculties referred to are avoided, and more particularly for preventing an excessive number of stitching cycles of the machine between the occurrence of an improper operation and the time the machine comes to a full stop so that full attention of the operator may be directed towards properly presenting the work to the machine.

In the machine disclosed in the inventors patent heretofore referred to, a thread cutter is provided, acting whenever the machine stops to sever the thread by cutting beneath the surface of the work. If for any reason it is necessary to stop that machine before the seam is completed, the

thread may be severed and the surface of the work unnecessarily injured at an intermediate position in the completed seam. Thus, an additional injury may be made at the surface of the work. A further object of the present invention is to provide a thread cutter for a manually controlled shoe sewing machine arranged to operate only at the end of a completed seam, and to be held inoperative at all intermediate positions in a seam where the machine is likely to be stopped by reason of an improper stitching operation.

With these and other objects in view, the present invention relates to the provision in a shoe sewing machine having stitch forming devices actuated through driving and stopping mechanisms under control of a manually operated foot treadle, of means acting automatically as soon as an improper stitch is made to prevent continued and unnecessary injury to the work, even though the operator fails to observe the difliculty. In the present embodiment of this feature of the invention, the stitch forming devices are stopped when the tension on the sewing thread fails to draw the auxiliary take-up to one side, as in regular sewing, and the treadle and the driving and stopping mechanisms are immediately disconnected.

The machine hereinafter described is also equipped with a thread cutter similar to that of the application referred to, acting automatically when the machine is stopped to sever the sewing thread, but means are provided it the present machine for preventing actuation of the thread cutter when the treadle is held depressed so that if the machine is stopped before the end of a seam is reached by disconnection of the treadle and the driving and stopping mechanisms, the sewing may be restarted without break in the thread after suitable adjustments are made. While this feature is particularly applicable to use with the novel features of the control means for stopping upon failure of tension, it is not necessarily limited to such use, but is advantageous when applied to any sewing machine having treadle controlled driving and stopping mechanisms and an automatically actuated thread cutter, in which the driving and stopping mechanism may be controlled to stop sewing by. means other than release of the treadle.

Another feature of the invention relating to the auxiliary take-up which is also of general application to any sewing machine with or without a thread cutter, contemplates the provision of novel and improved means for causing the auxiliary take-up not only to maintain a yielding tension on the thread during sewing, but also to take up yieldingly and to hold within the machine at the end of a seam an extra length of thread for use in the first stitch of a new seam so as to prevent breakage or waste of thread in restarting the machine.

Other features of the invention include certain devices, combinations and arrangements of parts hereinafter described and. claimed, the advantages of which will be readily understood by one skilled in the art from the following description taken in connection with the accompanying drawings in which Figure 1 is a view in front elevation, partly broken away and in section of the upper portion of a sewing machine embodying the features of the present invention, and illustrating the actuating parts in stopped positions; Figure 2 is a view in side elevation of the machine with parts partly broken away, as viewed from the right of Figure 1; Figure 3 is a similar view, looking from the left hand side of the machine; Figure 4 is a view on a slightly enlarged scale of some of the parts shown in Figure 3, and with the control connections shown in operating positions; Figure 5 is a detail view of some of the connections, taken on the line 55 of Figure 4; Figure 6 is a view in rear elevation, partly in section of the machine; Figure '7 is a view in front elevation on an enlarged scale of a portion of the machine including the main and auxiliary take-ups; Figure 8 is a view of the same parts shown in positions somewhat laterin a sewing cycle than the positions indicated in Figure 7; Figure 9 is a similar view of the parts as shown in Figures 7 and 8 showing thepositions assumed when the machineis stopped by failure of tension on the thread; Figure 10 is a view, partly in section of the parts shown in Figure 9, looking from the left hand side of the machine; Figure 11 is a detail sectional view, taken along the line i l--l I of Figure 9; Figure 12 is a detail view of the auxiliary take-up and some of the actuating mechanisms connected therewith, shown in section taken along the line l2l 2 of Figure 1; and Figure 13 is a sectional view taken on the line |3|3 of Figure 4.

Except as hereinafter described, the various parts of the machine illustrated in the drawings are constructed and arranged to operate as in the lockstitch shoe sewing machine of inventors patent above referred to. The machine is provided with stitch-forming devices including a. curved hooked needle 2, a curved awl 4, a shuttle 5, a work support 6, a presser-foot I, a main takeup 8 and a tension wheel 10. The stitch forming devices are actuated from a main sewing cam shaft l2 through connections which are the same as those embodied in the machine of inventors patent above referred to, and will not be particularly described herein. Within the shuttle is a supply of locking thread, one end of which is indicated at l4, and the needle thread l6 passes from the tension wheel l0 around pulleys I8, 20 and 22 to the main take-up 8 before reaching the work. Between the pulleys 20 and 22 the thread passes over an auxiliary I take-up 24 loosely mounted on a stud bolt 25 which also supports the pulley 22 for rotation. The thread passes under the pulley 22, over the auxiliary take-up and under the pulley 20 so that the auxiliary take-up tends to hold thread yieldingly at one side of its normal path between the two pulleys except when a stitch is being set, at which time the auxiliary take-up yields up thread as shown in Figure 8.

The driving and stopping mechanisms are the same as in the machine of inventors Patent No. 2,078,942 of May 4, 1937, and comprise a high speed treadle controlled clutch 26 (Figs. 1 and 2) for driving the sewing shaft, and an automatically controlled reversely driven low speed clutch, the driver of which is indicated at 28 and the driven member at 29. In stopping the machine the low speed clutch is first actuated and then rendered inoperative when the needle and awl are clear of the work, and a timing cam 30 is provided for this purpose. A cam lever 32 is vibrated by the cam 30 while the machine is in operation, and the lever is locked against movement when the machine is to be stopped. To start the machine in operation, the main driving clutch 26 is engaged through the action of a forked arm 34 connected at its upper end with the clutch and secured to a rock shaft 36 having an arm 38 to which the upper end of a vertical rod 40 is secured. The rod 40 is slidable in a perforated block 42 pivotally mounted on an arm 44 connected to one end of a shaft 46. The other end of the shaft 46 has an arm 48 to which the upper end of a treadle rod 50 is pivotally connected, and the lower end of the rod is connected to a foot treadle 52. When the treadle is depressed, a spring ii on the rod 40 is compressed against a check nut on the rod 40 by downward movement of the block 42, and the clutch 26 is engaged. When the treadle is released, the clutch 26 is disengaged by means including springs 53 and 54 connected to the arm 44 and the arm 38, respectively. The arm 44 is provided with a hook shaped cam surface engaged by a roll on a lever 56 having an upstanding forked arm embracing a spool-like member at the end of a lock bolt 58, so arranged that when the treadle is depressed to start the machine, the lock bolt 58 will be withdrawn from an opening in the lower end of the cam lever 32 and when the treadle is released, the lock bolt will be allowed to engage and lock the lever 32. The parts so far described and the other stitch forming devices with their actuating mechanisms are the same as in the machine of inventors application.

In the machine illustrating the embodiment of the invention, means are provided for disconnecting the treadle from the driving and stopping mechanisms whenever the tension on the sewing thread fails to draw the auxiliary take-up 24 to one side from its retracted position (Fig. 7) so that the machine will automatically be brought to rest. To urge the auxiliary take-up yieldingly towards its retracted position during sewing, the hub of the auxiliary take-up is surrounded by a coil spring 60, one end of which is held by a forwardly bent stop arm 62, and the other end of which is hooked around the auxiliary take-up arm (see Fig. 12). To limit the taking up movement of the auxiliary take-up, the auxiliary take-up arm carries a perforated plate 64 surrounding its hub and having a forwardly bent finger 86 arranged to cooperate with the stop arm 62 when the auxiliary take-up is retracted by the spring 60. The plate 64 is provided with a slotted porstitch is being set (Fig.

tion through which passes a screw 68 threaded into the auxiliary take-up arm, so that the retracted position may be adjusted. When the finger 66 attached to the auxiliary take-up rests against the arm 62 during sewing, the forwardly bent portion of the finger lies in the path of a reciprocating rod I8 guided within a sleeve-like passage formed in a threaded bar 12 attached to the machine frame. The upper end of the rod I8 is pivotally connected to one arm of a lever 14 fulcrumed on a screw stud I6 which in turn is threaded to one end of an arm I8 fixed to a rock shaft 88 (seev Fig. 12) extending rearwardly of the machine. The lever I4 is oscillated on the stud I6 during each sewing cycle of the machine by connections including a link 8I, as will be more fully described hereinafter, just as each stitch is set, so as to project the rod 18 into the path of the finger 66. During normal sewing operations, movements of the auxiliary take-up by the thread draws the finger 66 yieldingly out of the way of the reciprocating rod 18, while each 8). At this time the maximum tension is being applied to the needle thread and if looseness occurs in the thread, the thread will fail to cause the auxiliary take-up to yield so that the rod 18 will engage the finger 66 and the rod will be held from reciprocating movement as shown in Fig. 9. When this occurs, the oscillation of the lever 14 about the screw stud 16 is stopped and the stud and the arm I8 are raised upwardly about the shaft 88 as a center, causing the shaft to be rotated. The rearward end of the shaft 88 carries an arm 82 (see Figs. 4 and 6) connected with latch means for disconnecting the treadle rod and the .driving and stopping mechanisms.

The latch means for disconnecting the treadle from the driving and stopping mechanisms is best shown in Figs. 4, 5, and 11. Referring to these figures, the arm 48 to which the upper end of the treadle rod 58 is connected, is loose on the shaft 46, and at the end of the shaft there is a short arm 84, the free end of which is provided with a shoulder cooperating with a latch lever 86 see cured to a pin 88 rotatable in a lug on the arm 48, the pin serving as a fulcrum for the lever 86.

The latch lever 86 is ordinarily held in alignment with and directly above the shoulder on the arm 84, as shown in Fig. 4, by a spring 98 stretched between a pin on the latch lever 86 which extends through a slot in the arm 48 and a dog 92 pivotally mounted on the arm 48. In

this position of the latch lever, the arm 48, which is connected with the treadle and the arm 84 which is secured to the shaft 46 act together to control the driving and stopping mechanisms.

. However, when the reciprocating rod 18 engages the finger 66, as indicated in Fig. 9, the shaft 88 being rotated, a vertical link 94 connected at its upper end with the arm 82 on the shaft 88 causes one end of the dog 92 to engage an arm 96 on the pin 88 which supports the latch lever, thus causing the latch lever to move out of alignment with the end of the arm 84, as shown in Fig. 10. In this position of the latch lever the arm 84 is disconnected from the arm 48 so that the springs 53 and 54 cause the driving and stopping mechanisms to bring the machine to rest. To actuate the dog 92 against the arm 96 the lower end of the link 94 is provided with a pin 98 engaging one end of the dog 92. The link 94 has a slot I82 at its lower end through which passes a screw I88 so that the link may move relatively to the arm 48. The link 94 is also formed with frame and a shoulder-on the link.

When the machine has been brought to rest after disconnect on of the treadle controlling connections, the connections will not be reset until the treadle is released. The timing of the machine is such that after the reciprocating rod 18 has been projected against the finger 66 .to stop the machine, it will be withdrawn from the finger during the final movements of the machine by the driving and stopping mechanisms so that the link 94 will be again lowered and the latch lever 86 permitted to engage the arm 84. This engagement of the latch lever with the arm 84 occurs, however, after the arm has been moved above the lowerend of the latch lever as shown in Fig. 10, so that the parts are re-latched only after the arm 48 and the treadle have been released. If the cause of slack thread has been removed when the treadle is again depressed after being released, the machine will operate in the usual way, but if the difiiculty has not been removed the machine will again be brought to rest in the manner just outlined after the completion of a single sewing cycle of operation.

To reciprocate the rod 18 towards and from the path of the finger 66, the link 8| is connected at its uppermost end to an arm II8 formed integrally with the forward end of a shaft II2 parallel to the shaft 88. At the rearward end of the shaft I I2 is an arm II4 connected to the lower end of a link I I6, having at' its upper end a slotted block II8 (see Figs. 3 and 4) .forming a universal a gear segment on a cam lever I24 which corre-' sponds with the cam lever 41 cation. The cam lever on a shaft in a cam on the main sewing shaft I2. Cam slot I28 is so shaped that the rod 18 will reciprocate into and from the path of the finger 66 on the auxiliary take-up arm 24 at a time in each sewing cycle that the stitch is being set by the main take-up.

The machine is also provided with a thread cutter constructed in a manner more fully described in inventors Patent No. 2,148,197, and actuated across the path of the needle and awl against the work while on the work support 6. The knife I38 of the cutter is supported on an arm I32 secured at the end of a vertical shaft I34. The shaft I34 is given a rotary and reciprocating motion towards and from the work to impart a helical stroke to the knife I38, cutting the threads of the last stitch by penetrating the upper surface of the work as described in the application. To actuate the knife, the shaft 134 is connected to a vertical rack I36 (see Fig. 2)

of the prior appli- I 24 is fulcrumed loosely meshing with a segment I38 on a horizontal shaft within which is astud I58 on an actuating cam lever I52 pivoted at its lower end on a bolt I54 and provided with a follower I 56 engaging a I26 and is actuated by a cam slot I 28 slot in an actuating cam I 581 loose on a continuously rotating auxiliary shaft I58 at the rear of the main sewing shaft, the cam being driven one revolution to actuate the cutter when the machine stops.

To cause the cam I58 to be rotated one revolution when the sewing shaft substantially reaches a position with the needle and awl disengaged from the work as the machine stops, there is a one-revolution roller-type clutch I82 (see Fig. 2) connected to the cam which is held inactive during sewing by a pawl I84 rotatably mounted on a shaft I 88 to move towards and from engagement with an abutment on the clutch. To withdraw the pawl I84 from the abutment at the end of a seam so that the cam will be rotated, the shaft I88 also loosely supports a dog I88, two finger portions of which cooperate with a roll I18 when the sewing shaft I2 is reversely rotated by the low speed driving clutch, and the dog I88 imparts a rotary movement in the proper direction to withdraw the pawl I84 just as the machine comes to rest.

If the machine of Patent No. 2,148,197 is brought to rest, for any reason before the end of a seam to be completed is reached, the thread cutter will be actuated to sever the threads unless special adjustment is made, as hereinafter de scribed, and an unnecessary cut will be made in the surface of the work. When the machine is again started there will be a break in the line of stitching and an injury to the appearance of the work.

To avoid this difliculty, the prior machine is equipped with a manual means including a control handle I12, arranged when set in proper adjusted position to prevent operation of the thread cutter. The handle I12 is pivoted on the frame of the machine and is connected by means of a link I14 to an arm I18 secured to the outer end of a shaft I18. To the inner end of the shaft I18 is fixed an arm I88 (see Fig. 6) having a pin I82 sliding loosely in the slotted lower end of a link I84, theupper end of which is pivotally connected to the rearward end of the link I48 of the cutter actuating connections. When the rearward end of the link I48 is held in lowered position the vertical part of the L-shaped slot I48 engages the stud I58 on the lever I52, so that the cutter will be actuated when the lever I52 is moved. To hold the cutter actuating link I48 in lowered position, the link I84 is connected to one end of a tension spring I88, the other end of which is connected to the machine frame. When the handle is moved rearwardly, the cutter actuating link I48 is raised until the stud I58 engages the horizontal part of the slot so that the cutter will not be actuated when the cam lever I52 is moved by the cam I58.

If the operator wishes to insure that the cutter of the machine disclosed in the application will not operate in case the machine is stopped suddenly before the end of a seam is reached, the handle I12 may be kept in the rearwardly adjusted position until just before the seam is completed. In order to cause the cutter to be actuated, under these circumstances at the end of a scam, the handle I12 must be drawn forwardly simultaneously with, or just before, release of the treadle. Otherwise the cutter will not he actuated until the machine is again restarted and stopped. This movement of the handle I12 requires an extra manipulation which is ordinarily of greater inconvenience than that of severin the threads with a hand knife at the end of a seam in the usual way.

As has been stated, the thread cutter in the present machine is held from operation if the machine is stopped by reason of automatically disconnecting the treadle from the driving and stopping mechanisms. To hold the thread cutter inoperative when the machine is thus stopped, connections are provided for preventing operation of the cutter when the treadle is held depressed. The cutter actuating cam I58 being caused to rotate only when the machine is stopped, the cutter can only be operated when the machine is stopped by release of the treadle in the usual way, and no cutting will occur if the machine is stopped when the treadle is released after stopping.

The connections for preventing operation of the cutter act upon the slotted end of the cutter actuating link I48 and are so arranged that when the treadle is depressed, the horizontal portion of the L-shaped slot I48 engages the stud I58 whether the handle I12 is in its rearward position or not. To permit the cutter actuating link I48 tobe raised to this position when the treadle is depressed, the lower slotted end of link I84 cooperates with a pin I88 (see Fig. 13) mounted on an arm I98 secured to the inner end of a shaft I92. The shaft I92 is rotatable in bearings alined with the bearings for shaft I18 so that pin I88 moves in the same are as the pin I82. The pin I88 enters only partway into the slotted end of the link I84 so as not to interfere with the pin I82, the slot in the link I84 being long enough to permit the link I84 to be held in raised position by either of the pins I82 and I88 regardless of the position of the other. The shaft I92 has secured to its outer end an arm I94 (see Figs. 3, 4 and 6) connected to the treadle actuated arm 48 by a link I98. When the machine is stopped by disconnecting the treadle from the driving and stopping mechanisms, the arm 48 is held in lowered position and the arm 84 only, which is secured to the shaft 48, is released.

The cam 38 for actuating the low speed driving clutch is so shaped that the machine is brought to rest after being reversely rotated with the main take-up 8 near the end of its taking up stroke, but spaced a short distance from the extreme limit of its taking up movement. When the work is withdrawn from the machine of the application after the operation of the thread cutter, the thread will adhere somewhat to the work so that the end of thread may be withdrawn with the work a short distance from the work support and a length of thread equal to the amount required by the take-up in completing its taking up stroke is drawn over the edge of the work support. When a new work piece is inserted in the machine and clamped by the presser-foot, the thread will also be clamped so that it will not be drawn back into the machine during the first stitch of a new seam. The amount of thread left on the work support, therefore, is wasted, being made up by an additional amount drawn from the supply when the machine is started. To prevent a length of thread being withdrawn from the present machine after stopping, equal to the amount required by the take-up in completing its taking up stroke, the auxiliary take-up 24 is actuated when the machine stops, in the present machine, to take up and hold yieldingly an amount of thread and to give up thread when the machine is restarted so that thread will be retained in the machine for use in completing the first stitch of a new seam without further withdrawal from the supply.

To actuate the auxiliary take-up 24 at the end of a seam so that an extra length of thread will be held yieldingly within the machine while stopped for use in the first stitch of the new seam, connections are provided between the auxiliary take-up and the driving and stopping mechanism for changin the position of the stop arm 62. When the machine is running. the arm 62 is held in the position shown in Figures 7 to 9, so as to give the auxiliary take-up a limited range of movement, and when the machine is stopped the stop arm is lowered to the position of Figure l to increase the range of movement of the auxiliary take-up. The stop arm 62 is connected to a hub I98 (see Fig. 12) surrounding the bolt 25. The hub I 98 also has extending from it an arm 200 pivotally connected to one end of a link 202, the other end 'of which is pivotally connected to an arm 20! secured to the forward end of a sleeve 206 surrounding the shaft 80 and having hearings in the machine frame. The sleeve 206 also has secured to its central portion an arm 200 pivotally connected to a slotted block 2I0 having a pivotal connection with a link 2I2 connected to a block 2 (see Fig. 4) similar to the block 2I0. The block 2 is pivotally connected with an arm 2I6, the arrangement providing for universal movement between the arm 2I6, the link 2I2 and the arm 208. The arm 2I6 is secured to the shaft I66 and to rock the shaft when the machine is stopped, the connections include a lever 2I8 secured to the shaft I66, a link 220 connected at its upper end to an arm of the lever ZI8 and at its lower end to an arm 222, a sleeve 224 (see Fig. 6) to which the am 222 is fixed, and the lever 56 which is also secured to the sleeve 22!. When the lock bolt 58 enters the opening in lever 32 to bring the machine to rest, the lever 56 rocks the shaft I66 and the connections described cause the stop arm 62 to be moved to the position of Figure 1, so that the spring 60, which actuates the auxiliary take-up, may rotate the auxiliary take-up further in a counterclockwise direction than occurs during sewing, thus yieldingly taking up an extra supply of thread. The extra supply taken up is adjusted to provide thread for the main take-up in restarting the machine. When the machine is restarted these connections return the stop arm 62 to the position of Figures 7 to 9 so that the extra supply is given up. If the thread cutter has been actuated when the machine is stopped, the end of thread in the first stitch of a new seam formed when the machine is restarted will be close to the work and will require no trimming. If the cutter is not operated, the yielding action of the auxiliary take-up will permit the work to be manipulated to a limited extent in order to relocate the work properly with respect to the stitch forming devices, and the seam may be continued without break in the thread or other irregularity.

The nature and scope of the invention having been indicated, and a machine embodying the features of the invention having been specifically described, what is claimed is:

l. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at vill, means acting automatically to render said connections ineffective to maintain continued actuation of the stitch forming devices when said devices operate improperly, and means for causing the stopping mechanism to stop the stitch forming devices when said connections are rendered ineffective.

2. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, means comprising a treadle and.

suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means acting upon failure of thread tension during a stitch forming cycle to render said connections inefiective to maintain continued actuation of the stitch forming devices, and means for. causing the stopping mechanism to stop the stitch forming devices when said connections are rendered ineflective.

3. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, and means acting automatically and independently of treadle movement upon failure of thread tension during a stitch forming cycle to cause the stoppiing mechanism to stop the stitch forming dev ces.

4. A sewing machine having, in combination, stitch forming devices, a main take-up, and a yieldingly actuated auxiliary take-up, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means connected to the auxiliary take-up for disconnecting the treadle from the driving and stopping mechanisms when the tension on the thread passing over the auxiliary take-up fails, and means for causing the stoppingmechanism to stop the stitch forming devices when the treadle is disconnected. I

5. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing stop the stitch forming devices at will, a thread cutter, and means for preventing actuation of the thread cutter when the treadle is held in a position to cause the stitch forming devices to be actuated.

6. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means acting automatically upon an improper operation of the stitch forming devices to cause the stopping mechanism to stop the stitch forming devices, a thread cutter, mechanism for actuating the thread cutter upon stopping of the stitch forming devices by manipulation of the treadle by the operator, and means for preventing actuation of the thread cutter upon stopping of the stitch forming devices by reason of an improper operation of said devices.

to actuate and to '7. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, a thread cutter, power driven mechanism for actuating the thread cutter, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, and treadle actuated connections for causing the thread cutter to be disconnected from its actuating mechanism when the treadle is depressed and to be reconnected to its actuating mechanism when the treadle is released.

8. A sewing machine having, in combination, stitch forming devices, driving and stopping mechanisms, a thread cutter, power driven mechanism for actuating the thread cutter, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means acting automatically upon an improper operation of the stitch forming devices to render the treadle ineffective to maintain continued actuation of the stitch forming devices, means for causing the stopping mechanism to stop the stitch forming devices when the treadle is rendered ineffective, and treadle actuated connections for preventing actuation of the thread cutter upon stopping of the stitch forming devices by reason of an improper operation of said devices.

9. A sewing .machine having, in combination, stitch forming devices, driving and stopping mechanisms, a treadle for controlling the driving and stopping mechanisms, a thread cutter, power driven mechanism thrown into operation by the driving and stopping mechanisms in stopping the machine to actuate the thread cutter, means for rendering the driving and stopping mechanisms effective to stop the machine when the stitch forming devices operate improperly, and means for preventing operation of the thread cutter when the treadle is held in a position to cause the stitch forming devices to be actuated.

10. A sewing machine having, in combination, stitch forming devices, a main sewing shaft for actuating said devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, a thread cutter, power driven mechanism thrown into operation when the sewing shaft reaches a predetermined position in stopping the machine, connections between the cutter and the power driven mechanism for actuating the cutter, and

connections between the treadle and the cutter actuating connections for rendering the cutter inoperative when the treadle is in a position to cause the stitch forming devices to be actuated.

11. A sewing machine having, in combination, stitch forming devices, a main sewing shaft for actuating said devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, a thread cutter, power driven mechanism thrown into operation when the sewing shaft reaches a predetermined position in stopping the machine, connections between the cutter and the power driven mechanism for actuating the cutter, connections between the treadle and the cutter actuating connections for rendering the cutter inoperative when the treadle is in a position to cause the stitch forming devices to be actuated, and means for rendering continued pressure on the treadle ineifective to maintain continued actuation of the stitch forming devices when said devices operate improperly.

12. A sewing machine having, in combination, stitch forming devices including a main take-up, a yielding auxiliary take-up, a reciprocating member operated once during each sewing cycle of the machine, means for holding said member from reciprocating when the thread fails to cause the auxiliary take-up to yield, connections to said member for bringing the machine to rest when the member is held from reciprocating, a stop for limiting the movement of the auxiliary takeup during sewing, and means for moving the stop when the machine is being brought to rest to increase the yielding movement of the auxiliary take-up in a direction to take up thread.

13. A sewing machine having, in combination, stitch forming devices including a main take-up, an auxiliary take-up operating yieldingly through a limited range of movement to maintain tension on the thread, driving and stopping mechanisms for bringing the machine to rest, a stop for limiting the range of movement of the auxiliary takeup during sewing, and means for moving the stop to permit the auxiliary take-up to increase its range of movement in a direction to take-up an extra supply of thread when the machine is being brought to rest.

14. A sewing machine having, in combination, stitch forming devices including a main take-up, an auxiliary take-up operating yieldingly through a limited range of movement to maintain tension "on the thread, driving and stopping mechanism for bringing the machine to rest, with the main take-up near the end of its taking up stroke, a stop for limiting the range of movement of the auxiliary take-up during sewing, and means for moving the stop asthe machine comes to rest to increase the range of movement of the auxiliary take-up to take up an amount of thread equal to that required by the main take-up in completing its taking up stroke as the machine is restarted.

15. A sewing machine having, in combination, stitch forming devices, a main sewing shaft for actuating said devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, a thread cutter, power driven mechanism thrown into operation when the sewing shaft reaches a predetermined position in stopping the machine, connections between the cutter and the power driven mechanism for actuating the cutter, connections between the treadle and the cutter actuating connections for rendering the cutter inoperative when the treadle is in a position to cause the stitch forming devices to be actuated, and manual means for preventing operation of the cutter in any position of the treadle.

16. A sewing machine having, in combination, stitch forming devices, a main sewing shaft for actuating said devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, a thread cutter acting at the end of a seam tosever the thread close to the surface of the work in the machine, means for preventing actuation of the thread cutter at certain times when the machine is brought to rest, and yielding means for holding yieldingly a length of thread within the machine after stopping and for giving up said length of thread when the machine is started.

17. A sewing machine having, in combination, stitch forming devices, a main sewing shaft for actuating said devices, driving and stopping mechanisms, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means for yieldingly taking up a length of thread at the end of a seam, and means actuated upon restarting the machine for causing the said length of thread to be given up.

18. A sewing machine having, in combination, stitch forming devices, a main driving shaft for actuating said devices, driving and stopping mechanisms for bringing the shaft to rest at a predetermined angular position, a treadle for causing the driving and stopping mechanisms to actuate and stop the shaft, a thread cutter, power driven mechanism thrown into operation by the main shaft in coming to rest, connections between the cutter and the power driven mechanism for actuating the cutter, means for disconnecting the cutter actuating connections when the treadle is depressed, and means for causing the driving and stopping mechanisms to stop the main shaft while the treadle is depressed.

19. A sewing machine having, in combination, stitch forming devices including a main take-up, a yielding auxiliary take-up, a reciprocating member operated once during each sewing cycle of the machine, a finger actuated by the auxiliary takeup arranged to be engaged by the reciprocating member when the tension on the thread fails, means for bringing the machine to rest when the reciprocaating member engages the finger, a stop to hold the auxiliary take-up at a position in which said member will engage the finger, and means for moving the stop when the machine is brought to rest to permit the auxiliary take-up to move in a direction to take up thread past the position in which said member will engage the finger.

20. A sewing machine having, in combination, stitch forming devices including a main take-up, a yielding auxiliary take-up, a reciprocating member operated once during each sewing cycle of the machine, a finger actuated by the auxiliary take-up arranged to be engaged by the reciprocating member when the tension on the thread fails, driving and stopping mechanisms, means for causing the driving and stopping mechanisms to bring the machine to rest when the reciprocating member engages the finger, a stop for the auxil- 'iary take-up arranged to hold the auxiliary takeup at a position in which said member will engage the finger, and connections between the stop and the driving and stopping for moving the stop when the machine is brought to rest to permit the auxiliary take-up to move in a direction to take up thread past the position in which said member will engage the finger.

21. A sewing machine having, in combination, stitch forming devices, a main take-up, and a yieldingly actuated auxiliary take-up, driving and stopping mechanisms, a manually operated treadle for causing the driving and stopping mechanisms to actuate the stitch forming devices when the treadle is depressed, and means for disconnecting the treadle from the driving and stopping mechanisms durlng operation of the stitch forming devices when the tension on the thread passing over the auxiliary take-up fails, and thereafter for maintaining the treadle connected to the driving and stopping mechanisms for at least a single sewing cycle of the stitch forming devices after the treadle is released and again depressed, regardless of the tension on the thread.

22. A sewing machine having, in combination, stitch forming devices including a main take-up, an auxiliary take-up operating yieldingly through a limited range of movement to maintain tension on the thread, driving and stopping mechanisms comprising a high speed driving mechanism and a low speed driving mechanism having a vibrating lever and a lock bolt for engaging the vibrating lever after the machine is driven by high speed driving mechanism to bring the low speed mechanism into operation and the machine to rest, a stop for limiting the range of movement of the auxiliary take-up during sewing, and a connection acting when the lock bolt is brought into cooperative relation with the vibrating lever for moving the stop to permit the auxiliary takeup to increase its range of movement in a direction totake up an extra supply of thread when. the machine is being brought to rest.

23. A sewing machine having, in combination,

. stitch forming devices, a cam shaft, driving and stopping mechanisms for said shaft, means comprising a treadle and suitable connections for maintaining the driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, and means actuated from the cam shaft, upon failure of thread tension during a stitch forming cycle, to render said connections ineffective and cause the stopping mechanism to stop the stitch forming devices.

24. A sewing machine having, in combination, stitch forming devices, a cam shaft, driving and stopping mechanisms for said shaft, means com,- prising a treadle and suitable connections for maintainingthe driving and stopping mechanisms under the constant control of the operator during sewing to actuate and to stop the stitch forming devices at will, means actuated from the cam shaft when said devices operate improperly to render said connections ineffective to maintain continued actuation of the stitch-forming devices and cause the stopping mechanism to stop the stitch-forming devices.

O'I'IO R. HAAS.

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