US2520140A - Welt shoe sewing machine - Google Patents

Description

Aug. 29, 1950 o. R. HAAs WELT SHOE SEWING MACHINE 2 Sheets-Sheet '1 Filed Aug. 28, 1947 1 ....J x U m,

Inventor 05230 Haas Aug. 29, 1950 o. R. HAAS WELT SHOE SEWING MACHINE 2 Sheets-Sheet 2 Filed Aug. 28, 1947 Inventor Otto R Haas Patented Aug. 29, 1950 UNITED STATES PATENT OFFICE WELT SHOE SEWING MACHINE Otto R. Haas, Wenham, Mass, assignor to United Shoe Machinery Corporation, Flemington, N. 3., a corporation of New Jersey Application August 28, 1947, Serial No. 771,031

7 Claims. 1

The present invention relates to welt shoe sewing machines and is herein illustrated as embodied in a curved hook needle chain stitch machine similar to the machine disclosed in United States Letters Patent No. 2,220,112, dated November 5, 1940, upon application of Alfred R.

Morrill.

The machine of the patent is provided with a stop mechanism for bringing the machine to rest with the stitch forming devices in a predetermined position to facilitate easy removal of a shoe and with welt gripping and severing mechanism tripped into operation upon removal of a shoe from the stitch forming devices by a pull exerted on the welt attached to the shoe. It has been found that in some instances the tripping of the welt gripping and severing mechanism in this way subjects the operator of the machine to certain hazards, particularly if adjustments of the machine are attemped without first disconnecting the machine from its source of power. For instance, if an excessive pull is exerted on the welt during adjustments, a repetition of the welt gripping and severing operation may cause injury to the operators hands in case they hap-. pen to be engaged by the gripping and severing devices.

An object of the present invention is to provide a welt shoe sewing machine of the type referred to having novel and improved means for preventing injury to an operator by the welt gripping and severing mechanism if an attempt is made to adjust the machine without disconnecting the machine from its source of power. Other objects are in general to improve the construction and mode of operation of a welt shoe sewing machine and to provide a machine which will comply in all respects to accepted safety des.

To these ends the machine of the presen invention is equipped with the usual mechanism for gripping and severing the welt at the end of a seam and with devices for tripping said mechanism into operation upon removal of a shoe, which there are provided connections actuated by the gripping and severing mechanism after a single operation thereof to render the tripping devices inoperative again to trip the gripping and severing mechanism, the condition of inopera:

tiveness being retained until a new seam is started. In this way the operator is safeguarded so that adjustment of the machine which might include an accidental pull or tension in the welt will not cause repetition of the welt gripping and severing operation. In its preferred form the second operation preventing means acts to free the welt from the tripping devices after the first welt gripping and severing operation.

As in the machine of the patent, the gripping and severing mechanism is tripped into operation by movement of a welt guide having a clamp for causing the guide to move with the welt during removal of a shoe at the end of a seam. In the illustrated form of the machine the trip preventing means disengages the clamp from the welt after a single operation of the clamping and severing mechanism.

lhese and other features of the invention and other novel constructions, combinations and arrangements of parts as hereinafter described and claimed will be apparent from the fOllOWing description taken in connection with the accompanying drawings.

Referring to the drawings;

Fig. 1 is a view in -right side elevation of so much of the head of a welt shoe sewing machine as is necessary to illustrate the features of construction embodying the present invention, a part of the casing having been broken away to show the underlying mechanism; and

Fig. 2 is a detail sectional view in plan on an enlarged scale of the right-hand portion of the machine and certain of the inner parts as illustrated in Fig. 1. I

The machine illustrated in the drawing is intended for sewing the upper and welt to the insole of a welt shoe and is provided with a curved hook needle 2, a curved awl 4, a needle looper G, a channel guide 8, a thread finger I0, and other stitch forming devices more fully described in thepatent referred to. In the operation of the machine a shoe having the upper lasted to.v the insole is presented to the machine and the parts are sewed together with a welt l2 directed from a suitable source of supply toward the point of, operation of the stitch forming devices. At the end of a welt sewing operation the machine is brought to rest with the stitch forming devices in predetermined positions to facilitate removal of the sewn shoe. For this purpose a stop mechanism is provided including a vibrating bell crank l4 and a locking pin it connected through a link !8 with a control lever 25 fulcrumed on a screw stud 22 and actuated by a cam roll 24 through connections to a starting and stopping treadle not shown) arranged to be depressed by the operator in starting a new seam. After the machine has been brought to rest at the end of a seam, the welt is pulled when the sewn shoe-i withdrawn from operate,

ing position and we1t gripping and severing mechanism is tripped into operation. The welt gripping and severing mechanism includes welt gripping jaws 26 actuated by a one revolution shaft 28 tripped into operation through connections with a welt guide comprising a roll 30 over which the welt [2 passes to cause the guide roll 30 to be moved with the welt. The welt is gripped along that portion engaging the roll by a clamp 32 mounted on the roll and actuated as the machine comes to rest, in a manner more fully set forth in the patent.

To actuate the clamp 32 into gripping engagement with the welt, the roll 38 is provided with a central passage t receive a plunger 34 connected through a Spring 36 (Fig. 2) with a second plunger 38 having a rearwardly projecting portion engagin a pivoted arm 40. The plunger 34 is actuated through the spring 36 against a, set screw 42 to swing a lever 44 in which the set Screw and the clamp 32 are mounted to cause the clamp to grip the welt. For actuating the arm 46 at the end of a, seam the lever passes across the end of a sewing shaft 45 having slidably mounted within it a stop actuated member comprising a rod 46 arranged to be moved longitudinally against the arm when the machine comes to its regular stopped position. The rod 46 is moved longitudinally by a plate 48 pivotally mounted in the sewing shaft 45 and provided with an edge engaging the inner end of the rod 48. A Second edge of the plate 48 is engaged by a spring pressed plunger 58 acted upon by a lever 52 in a cam 54 on the sewing shaft 45 during the final stopping movement of the machine as a cam follower 56 moves into contact with the lever 52 to press the plunger against the force of its spring.

In the machine of the patent above identified, the connections described prevent free movement of the welt relatively to the roll 38 when the machine is at rest and if a moderate pull is imparted to the welt, tripping devices including the roll will be actuated sufficiently to cause operation of the gripping and severing mechanism. In addition to the roll, the tripping devices comprise a rod 58 connected with the roll and an arm 68 secured to a rock shaft 62. Movement is thereby imparted to a stop arm 64 fast on the shaft 62 to swing the stop arm away from a.latch 56 forming a part of a one revolution clutch on the shaft 28. Such movement of the stop arm away from the latch trips the clutch into operation and causes the shaft to be rotated a single revolution. Rotation of the shaft 28 actuates an cecentric on the shaft surrounded by a strap 68 which, in turn, is connected to a gear segment 18 meshing with one of a pair of pinions 72, the other of which meshes with a rack bar '14 for actuating the gripping jaws 28 and a welt severing knife on the rack bar. This is the usual operation of the gripping and severing mechanism when a sewed shoe is being withdrawn from the patented machine. However, the same operation may be repeated after the sewed shoe is withdrawn and the welt severed. In such case, there is danger that the operator's hands or a portion of a completed shoe disposed accidentally in the path of the gripping jaws and the severing knife may be subject to injury or damage.

To prevent injury to the operator or damage to a shoe by an unintentional or accidental pull on the welt l2 in the machine of the present invention the welt is freed from the grip of the clamp 32 on the guide roll 38 directly after each welt gripping and severing operation. Thus, if a pull is exerted on the welt after freeing it from the grip of the clamp, the welt will be moved over the roll without causing a repetition of the gripping and severing operation and any suitable adjustments including repositioning of the welt end remaining in the machine may be accomplished by the operator in safety, For this purpose the stop actuated rod 48 does not operate directly against the arm 40 but the arm has an opening to admit full movement of the rod 46 when the machine comes to rest without actuating the arm.

To cause the welt clamp 32 to be actuated against the welt in the usual way at the end of a seam, connections are provided between the welt gripping and severing mechanism and the tripping devices therefor. These connections act on the arm 40 which has a lengthwise passage to receive a recessed slide bar 16 movable lengthwise along the arm to bring the recess in the bar into and out of alinement with the rod 46. Thus, when the recess in the bar 16 is moved out of alinement with the rod, the rod engages the bar, and through the bar moves the arm 48 in the usual way to cause the welt to be gripped. When the recess in the bar is moved into alinement with the rod, the welt is released from the grip of the clamp 32. To insure free passage of the unclamped welt bout the roll 30, the roll is surrounded with an antifriction bearing sleeve l8 over which the Welt rides.

To move the slide bar 16 along the arm 48 the rearward end of the bar has a threaded opening within which is received a threaded stud portion of a transversely slotted block 80. Within the slotted portion of the block there is movably mounted pin at the upper end of a shifter lever 82 secured to a shaft 84 rotatable in a bracket 86 fast on the frame of the machine. The lower end of the shifter lever 82 extends into proximity with a cam 88 on the one revolution shaft 28 of the gripping and severing mechanism. The arrangement is such that in the normal stopping position of the machine a cut away portion of the cam is in alinement with the lower arm of the lever 82 so that the lever may shift the bar 16 to bring its recess out of alinement with the rod 46. It is this position of the lever that enables the welt to be gripped by the clamp 32 at the end of a sewing operation. As soon as the welt gripping and severing mechanism is thrown into operation the cam 88 rocks the lever 82 to shift the bar to a position with the recess in alinement with the rod 46, thus releasing the welt from the grip of the clamp 32.

To restore the parts to a position of readiness in starting the machine in operation the welt gripping connections are reconnected with the stopping mechanism. For this purpose an operative connection is provided between the control lever 28 and the bar'actuating lever 82 to move the lower end of the lever'into the recess of the cam 88. These connections include a pin 98 located in a position to be engaged by the control lever 28 and mounted on an arm 92 secured to the shaft 84. 'When the control lever 20 is actuated to render the stop mechanism inoperative before the machine is started in operation upon a new shoe, the lever engages the pin 90 and rocks the bar shifting lever 82 in the desired manner.

The nature and scope of the invention having been indicated and a particular embodiment having been described, what is claimed is:

1. A welt shoe sewing machine having stitch forming devices including a curved hook needle, mechanism for gripping and severing the welt at the end of a seam, and devices for tripping said mechanism, in combination with connections actuated by the gripping and severing mechanism after a single operation. thereof to render said tripping devices inoperative to trip the gripping and severing mechanism until a new seam is started.

2. A welt shoe sewing machine having stitch forming devices including a curved hook needle, mechanism for gripping and severing the welt at the end of a seam and devices engaged and actuated bya pull on the welt attached to a shoe to trip the gripping and severing mechanism during removal of a shoe at the end of a sewing operation, in combination with connections between the gripping and severing mechanism and the tripping devices for freeing the welt from the tripping devices to prevent a repetition of the operation of said mechanism until a new seam is started.

3. A welt shoe sewing machine having stitch forming devices including a curved hook needle,

mechanism for gripping and severing the welt,

a welt guide, and a clamp acting on the welt along that portion engaging the guide to cause movement of the guide with the welt during movement of a sewn shoe at the end of a sewing operation to trip the gripping and severing mechanism, in combination with connections between the gripping and severing mechanism and the tripping clamp for disengaging the clamp from the welt during the single operation of the grippin and severing mechanism to prevent a repetition of the operation of said mechanism before starting a new seam.

4. A welt shoe sewing machine having stitch forming devices, including a curved hook needle, mechanism for gripping and severing the welt at the end of a seam, a welt guide roll connected to trip the gripping and severing mechanism when rotated, a clamp acting to grip the welt on the guide roll to cause rotation of the guide roll during removal of a shoe at the end of a sewing operation, and a member actuated by movement of the machine into stopping position, in combination with connections between said stop actuated member and clamp to actuate the clamp into gripping relation with the welt, including a shiftable bar arranged for actuation by the gripping and severing mechanism for disconnecting the connections between the stop actuated member and the clamp after the welt is severed.

5. A welt shoe sewing machine having stitch forming devices, including a curved hook needle, stop mechanism for bringing the machine to rest in a predetermined position at the end of a seam, mechanism for gripping and severing the welt when the machine is brought to rest, a welt guide, a clamp acting on the welt along that portion engaging the guide to cause movement of the guide with the welt to trip the gripping and severing mechanism during removal of a shoe at the end of a sewing operation, and a member actuated by movement of the machine into stopping position, in combination with connections between said stop actuated member and clamp to cause the clamp to grip the welt against the guide, including a shiftable bar arranged for actuation by the gripping and severing mechanism for disconnecting the connections between the stop actuated member and the clamp and a connection between the stopping mechanism and the disconnecting bar for shifting the bar to reconnect the welt ripping connections when the stop mechanism is rendered inoperative in starting the machine in operation on a new shoe.

6. A welt shoe sewing machine having stitch forming devices including a curved hook needle, stop mechanism for bringing the machine to rest in a predetermined position including a control lever, mechanism for gripping and severing the welt when the machine is at rest, a welt guide roll, a clamp acting on the welt along that portion engaging the guide roll to cause movement of the roll with the welt to trip the gripping and severing mechanism during removal of a shoe at the end of a seam, and a member actuated by a movement of the machine into stopped position, in combination with connections between said stop actuated member and clamp comprising an arm and a recessed bar on the arm arranged for shifting movement to bring its recessed portion into the path of said stop actuated member to prevent operation of the clamp, and a connection between the bar and the control lever to shift the bar to a position with its recessed portion out of alinement with said step actuated member when the stop mechanism is rendered inoperative in starting the machine in operation on a new shoe.

7. A Welt shoe sewing machine having stitch forming devices including a curved hook needle,

- stop mechanism for bringing the machine to rest including a control lever actuable by the operator to render the stop mechanism inoperative in starting the machine in operation on a new shoe, mechanism for gripping and severing the welt when the machine is at rest including a one revolution shaft, a welt guide roll, and a clamp acting on the welt along that portion engaging the guide roll to cause movement of the roll with the welt to trip the one revolution shaft during removal of a shoe at the end of a seam, and a member actuated by a movement of the machine into stopped position, in combination with connections between said stop actuated member and the clamp comprising an arm and a recessed bar arranged on the arm for lengthwise sliding movement toward and from a position with the recess in the bar in alinement with said stop actuated member to prevent operation of the welt clamp, a shifter lever for the recessed bar, and a cam on the one revolution shaft acting on the shifter lever to bring the recess in the bar into alinement with said stop actuated member, and an operative connection between the shifter lever for the recessed bar and the stop mechanism control lever to shift the bar to a position with its recessed portion out of alinement with said stop actuated member when the control lever is actuated at the beginning of a new seam.

OTTO R. I-IAAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,411,798 Meyer Apr. 4, 1922 1,951,369 Oliver Mar. 20, 1934

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