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Patent US 2174294 A: Buttonhole-cutter safety device for automatic buttonhole sewing machines

 

Buttonhole-cutter safety device for automatic buttonhole sewing machines

Patent Number: US 2174294 A
Filing date: Jul 16, 1938
Publication date: Sep 26, 1939

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E. P. SPAINE Sept. 26, 1.939. BUTTONHOLE-CUTTER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE SEWING MACHINES Filed July 16, 1938 e Sheets- Sheet 1 amina E. P. SPAINE Sept. 26, 1939,

BUTTONHOLE-CUTTER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE SEW ING MACHINES Filed July 16, 1938 6 Sheets-Sheet 2 mime/1;

. mm k Q RN n m w E. P. SPAINE' Sepfia 26, 1939'.

BUTTONHOLE-CUT'I'ER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE SEWING MACHINES Filed July 16, 1938 6 Sheets-Sheet 3 Hi In: A

a NW 9 m m 6 E. P. SPAINE 2,174,294 CUTTER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE SEWING MACHINE:

Sept. 26, 1939'.

BUTTONHOLE- 6 Sheets-Sheet 4 Filed July 16, 1938 FIvLiI IIiII vl Sept. 26, 1939. E, R mm; 2,174,294

BUTTONHOLE CUTTER SAFETY DEVICE FOR AUTOMATIC BUTT ONHOLE SEWING MACHINES Filed July 16, 1938 s Sheets-Sheet 5 a Sheets-Sheet 6 E. P SPAINE iled July. 16, 1938 Sept. 26, 1939.

BUTTONI-IOLE-CUTTER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE sEwING MACHINES Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE BUTTONHOLE-CUTTER SAFETY DEVICE FOR AUTOMATIC BUTTONHOLE SEWING MA- CHINES Application July 16, 1938, Serial No. 219,489

7 Claims.

This invention relates to sewing machines of the automatic eyelet-end type having buttonholecutting mechanism and buttonhole-working mechanism which are separately power driven and whose sequence of operations is controlled automatically. These machines are of two distinct types known as cut-first machines and cut-after machines. In a cut-first machine the buttonhole-cutting mechanism operates prior to the operation of the buttonhole-working mechanism whereas, in a cut-after machine the buttonhole-working mechanism operates prior to the operation of the buttonhole-cutting mechanism. To prevent clashing of parts it is impor- 16 tant that safety means be provided to prevent the possible operation of the buttonhole-cutting mechanism at times during a buttonhole-producing cycle other than the time when it should properly operate.

An object of the present invention is to provide a safety device of the character described which will positively guard against the operation of the buttonhole-cutting mechanism over substantially the entire period of operation of the other mech- 5 anisms of the machine, so that the buttonholecutting mechanism cannot possibly operate or be operated while any working part of the machine is in a position to clash therewith or be damaged thereby.

With the above and other objects in View, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings, Fig. 1 is a right side elevation of a buttonhole sewing machine embodying the invention. Fig. 2 is a left side elevation of the machine. Fig. 3 is a rear end elevation of the machine. Fig. 4 is a bottom plan view of the machine. Fig. 5 is a vertical sectional 4:! View taken transversely of the buttonhole-cutter shaft. Fig. 6 is a horizontal sectional view through the bracket-arm standard of the machine showing, in plan, the parts of the present safety mechanism associated with the buttonhole-cutter shaft. Fig. 7 is a view similar to Fig. 5 with the parts drawn to a larger scale and showing the clamp-closing lever at the two extremes of its motion. Fig. 8 is a view similar to Fig. 6 with the cutter-starter or so -called gate shown, in full lines, in running position and, in

dotted lines, in stopping position. Fig. 9 is a fragmentary view similar to Fig. 7 but showing the cutter-starter shifter lifted to its ineffective position. Fig. 10 is a view showing the lifter for the cutter-starter shifter latched in ineffective position. Fig. 11 is a similar view showing the slight drop of the lifter lever for the cutter-starter shifter when the latch is unlatched by the operation of the stop-motion lever in starting the stitch-forming mechanism; this slight drop preventing re-engagement of the latch when the stopmotion lever moves to stopping positon, Fig. 5. Fig. 12 is a view, similar to Figs. 7 and 10, showing recovery of the cutter-shifter blocking latch which is carried by the lever which lifts the cutter-starter shifted to ineffective position; the recovery occurring when the cutter-starter returns from full line (running) position, Fig. 9, to the dotted line (stopping) position, same figure. plate mounted on the cutter-starter shifter.

In the preferred embodiment of the invention illustrated, the machine frame comprises a hollow box-like bed I from one end of which rises the standard 2 of the overhanging bracket-arm 3 terminating in the head 4.

The stitch-forming mechanism is of the well known type embodying an upper endwise reciprocatory and laterally vibratory needle 5 and underthread mechanism constructed substantially in accordance with the disclosure of United States Patent No. 1,372,473, dated March 22, 1921, and comprising a turret 6, Fig. 1, which is turnable about a vertical axis and carries threaded and.

non-threaded loopers, the former of which is shown at 1, and a pair of loop-detainers one of which is shown at 8. The needle-actuating mechanism is also mounted to turn about a vertical axis coincident with the axis of the turret and the usual turning movements are imparted to the upper needle and under looper mechanisms by the connected upper and lower sector gears 9 and I0, respectively, which are actuated in unison by the usual connections with the cam-groove I I, Fig. 4, in the feed-wheel I2. mechanism is more completely shown, for example, in United States Patent No. 1,162,207, November 30, 1915; Reissue Patent No. 15,324, April 4, 1922; and Patent No. 1,534,017, April 21, 1925. The mechanism operates to rotate the stitchforming devices in one direction about a vertical axis during the sewing around the eyelet-end of a buttonhole and to reversely rotate the stitchforming devices between sewing periods to restore them to initial position. The stitch-forming de- Fig. 13 is a perspective view of the tooth- This well known vices receive their stitch-forming movements from the main sewing shaft l3 which also drives the feed-cam l2 in step-by-step fashion, during the sewing, through the well known pin-and-starwheel drive M, Fig. 4, and the usual train of gears l5, such as more completely shown in said United States Reissue Patent No. 15,324.

The work-clamp is of the travelling type. It is first rapidly moved over the bed to carry the work forwardly from initial or buttonhole-cutting position to sewing position then more slowly moved in step-by-step fashion to place the stitches about the buttonhole, and then rapidly returned to initial position. It is constructed substantially in accordance with said United States Reissue Patent No. 15,324, and comprises the lower clamp-plates I6 and upper clamping feet I! which are depressed into clamping engagement with the work by a rocking movement of two connected coaxial rock-shaft sections l8, |8 to the former of which is connected an arm l9, Fig. 1, adapted to be depressed by the usual clamp-closing lever 20 actuated at the beginning of a buttonhole-making cycle by a camgroove 2|, Fig, 3, in a continuously running pulley 22 loose on the buttonhole-cutter shaft 23. A slide-pin 24, carried by the rearwardly extending arm of the clamp-closing lever, is permitted to enter the cam-groove 2| for one revolution of the pulley 22, whereupon it is ejected and latched in ejected position, as explained in United States Patent No. 1,832,665, November 1'7, 1931; the present clamp-closing mechanism being constructed substantially in accordance with the disclosure in said United States Patent No. 1,832,665.

The clamp-plates l6 are carried by the crossslide plate 25, Fig. 4, which, in turn, is carried by the longitudinal slide-frame 26 to which travelling movements are imparted by the link-connection 21, Fig. 4, with the longitudinal feedlever 28 having a follower 29 working in the longitudinal feed cam-groove 30 in the feed-wheel l2. The cross-slide plate 25 is shifted by the lever 3|, Fig. 4, which has the usual connections with the feed-wheel l2 and removable patterncam 32 on the cross-shaft 33 which is geared at 34, Fig. 1, to the feed-cam |2, so as to run with the latter. The present feed mechanism is constructed substantially in accordance with the disclosure of said United States Reissue Patent No. 15,324.

The rapid feed of the work-clamp from buttonhole-cutting position to sewing position and return is effected by the usual. constantly running rapid feed drive-shaft 35, which through a worm-and-gear reduction 36, Fig. 4, drives the live element 31 of a clutch, the driven element 38 of which is fast on the cross-shaft 33. It will be understood by referring to said United States Reissue Patent No. 15,324, that the withdrawal of the cone 39 from the driven clutch-element 38 cifects engagement of the driving and driven clutch-elements 31, 38, while projection of the cone 39 toward the driven clutch-element 38 effects the de-clutching of the parts 31, 38. The cone 39 is actuated by the usual arm 40 rigidly mounted on the endwise slidable rod 4| which is operated and controlled by the usual mechanism described in the Allen et al. United States Patent No. 1,711,483, of May 7, 1929.

The pattern-wheel 32, Fig. 2, which is removably carried by the cross-shaft 33, operates the usual tilting stop-motion lever 3 through the lever 42 and link 43 to control the period of action of the stitch-forming mechanism.

The buttonhole-cutting mechanism is constructed substantially in accordance with the disclosure of said United States Patent No. 1,548,- 815, and embodies the travelling buttonhole-cutter levers 44, 45, Fig. 2, which are given their customary travelling and closing-and-opening movements by suitable cams on the cutter-shaft 23 to which a single rotation is imparted prior to sewing by the continuously rotating pulley 22 acting through the usual one-revolution clutch. This well known clutch comprises a springpressed clutch-tooth 46 which is carried by a slide-block 41 sliding radially of the disk 48 fast on the cutter-shaft 23. This slide-block 41 is held in retracted position, Figs. 1 and 6, by the head 49 of a cutter-clutch control or cutterstarter lever 50 having an angular extension 5| at its rear end which is fulcrumed on the vertical M stud-pin 52. When the cutter-starter lever 50, 5| is shifted from dotted line to full line position, Fig. 8, the head 49 thereof releases the clutch-tooth slide 41 which is projected radially of the disk 48 by the spring 46, Fig, 1 to carry the clutch-tooth 45 into the path of movement of the internal teeth 53 on the pulley 22. The construction and mode of operation of the cutter-starter 58, 5| and cutter-clutch 46, 41, 53 are more fully disclosed in said United States Patent No. 1,548,815. It will be understood that when the cutter-starter is shifted to running position, full lines in Fig. 8, the cutter-shaft 23 is coupled to the power pulley 22 for one revolution only and is thereupon disconnected from the pulley 22 and brought to rest by the automatic return of the cutter-starter 5!], 5| to stopping position (dotted lines, Fig. 8); this return being effected by the cam-groove 54 in the hub of the disk .8 on the cutter-shaft acting upon the follower-pin 55 which is carried by the lever 50 and enters the cam-groove 54.

The machine in which the invention is presently embodied is a cut-first machine, that is, the buttonhole-cutting mechanism is operated before the buttonhole-working mechanism is started. When the operator presses down upon the starting lever 56, Fig. 2, the starting rod 51, Fig. 1, is, through suitable connections, pulled downwardly to initiate the action of the clampclosing mechanism. The down-pull on the starting rod 51 effects the release of the slide-pin 24 which enters the clamp-closing cam-groove 2| in the pulley 22 and causes the clamp-closing lever 20 to be given clamp-closing and return impulses. In the clamp-closing impulse the lever 20 is moved from full line position, Fig. '7, to dotted line position and effects the closure of the work-clamp by striking and depressing the lever !9, Fig. 1, on the work-clamp. During the return impulse of the clamp-closing lever 20, the cutter-starter 5|), 5| is shifted to running position, shown in full lines in Figs. '7 and 8. This is accomplished by the cutter-starter shifter 58 which is in the form of a push-rod pivoted at 59 on the clamp-closing lever 20 and, at its other end, projecting through a rectangular opening 60, Figs. 10 and 11, in the cutter-starter lever-arm 5|. The portion of the push-rod 58 which projects through the opening 60 in the lever-arm 5| has longitudinally adjustably mounted upon it a slideplate 6| formed with a depending tooth 62 which, When the push-rod 58 rides upon the lower edge of the opening 60 in the cutter-starter lever-arm 5| under the influence of the spring 63, engages the 1ever-arm and shifts the latter to full line or running position, Fig. 7, in the return impulse of the clamp-closing lever 28. This starts the cutter-shaft 23.

Means are provided to lift the push-rod or cutter-starter shifter 58 to an ineffective position Where it does not ride upon the lower edge of the opening 88 in the cutter-starter lever-arm 5|, and may reciprocate idly, if inadvertently operated, without tripping the buttonhole-cutting mechanism into operation. To this end there is fulcrumed on the stud-screw 54 a safety-lever 65 which extends rearwardly over the cutter-shaft 23, Fig. '7, thence laterally at 66 under the cutterstarter shifter 53, and thence rearwardly alongside the rearward end of the cutter-starter shifter 58. This safety lever 65 carries a follower roll 61 in position to be engaged and lifted by a cam 68 on the cutter-shaft 23. During the single rotation of the cutter-shaft 23, the cam 68 lifts the safety-lever 65 to the position shown in Figs. 9 and where it is retained by engagement thereunder of the shoulder 69 of the springbiased latch-lever l8. In this elevated position of the safety-lever 65, the transversely extending portion 58 thereof, Fig. 12, holds the cutterstarter shifter 58 in a safely elevated position with the tooth 62 well above the bottom edge of the opening 60, where the bar 58 may reciprocate idly, should the clamp-closing lever be inadvertently operated.

Pivoted at H on the rear end of the safetylever 65 is a cutter-starter blocking latch 12 the tail of which is connected. to one end of the biasing spring '83 for the latch l8. When the cutterstarter 58 is shifted to running or full-line position, Fig. '7, the shoulder 75 thereon moves to a position over the nose M of the latch l2, so that when the safety-lever 85 is lifted to the position shown in Fig. 9, the nose M is depressed by the shoulder l5. At the close of the single revolution of the cutter-shaft 23, the cutter-starter 5| is returned to its initial or stopping position, Fig. 12, and releases the nose M of the latch-lever 12 which springs upwardly behind the cutter-starter 5| and blocks the latter against rearward movement. This cutter-starter blocking latch-nose l4 locks the cutter-starter against accidental or inadvertent hand-initiated repeat operations at abnormal times during a buttonhole-producing cycle.

As the button hole cutter-shaft 23 nears the completion of its single rotation, Fig. l, and with the parts of the safety mechanism held elevated by the latch l8, Figs. 10 and 12, in safety position, the cam-nose it on the disk 83 depresses the arm 'i'i fast to the rock-shaft it the operation of which initiates the throwing in of the rapid-feed clutch M, 38 to start the rapid feed of the work-clamp from buttonhole-cutting to buttonhole-sewing position, as disclosed in said United States Patent No. 1,711,483.

The cross-shaft 33 which drives the feed-wheel i2 during this rapid-feed of the work-clamp, has mounted thereon, in the present instance, a safety cam-cylinder '59, Fig. 5, having a notch 8t therein affording at one side of the notch an angular drop-off shoulder 8!. When the machine is at rest, the cam i9 is in position for the notch 88 to receive the terminal extension 82 of an arm 83 fixed to the safety-lever 65. When the buttonhole cutter-shaft is operated to cut the buttonhole, the safety-lever 65 is lifted by the cam 68 to safety position and latched there by the latch 10. In this position of the safety-lever 55, the

extension 82 thereof is withdrawn from the notch 88 and is clear of the cam-cylinder 19 as the latter turns during the rapid-feed of the workclamp from buttonhole-cutting to buttonholesewing position.

When the work-clamp arrives in buttonholesewing position, the rapid-feed is thrown out and the cam 84 on the pattern-wheel 32 acts upon the lever 42 and link 43 to tilt the stop-motion lever s to its dotted line position to start the stitchforming mechanism.

The stop-motion lever s has fixed to its upper end a forwardly extending horizontal arm 85, which, in the tilting motion of the lever s to dotted line position, Fig. 2, strikes the tail B6 of the latch 10 and. disengages the shoulder 69 from the safety-lever 65 which drops sufficiently, Fig. 11, to prevent re-engagement of the shoulder 69 thereunder when the stop-motion lever returns to its upright or full-line position, Fig. 2, to stop the sewing operation. The amount of drop of the safety-lever 65 at this time is determined by the engagement of the safety-lever extension 82 with the cylindrical surface of the safety-cam 19 on the cross-shaft 33 which at the beginning of the rapid-feed movement of the shaft 33 is in position to take over from the latch 10 the duty of holding the cutter-starter shifter 58 elevated in ineffective position.

When the stop-motion lever s returns to its vertical (full line) position, Fig. 2, to stop the stitch-forming mechanism at the completion of the sewing of the buttonhole, the latch Ill is released and its nose 10, Fig. 11, engages the side of the safety-lever 65 which is free to drop when released by the cylinder-cam 19.

At the completion of the sewing operation, the rapid-feed is again thrown in to drive the shaft 33 and feed-wheel to carry the work-clamp rapidly back to its initial or starting position wherein the buttonhole was cut. During the return rapid-feed of the work-clamp the stitchforming mechanism is reversely rotated to restore the needle and turret to their starting positions. In some machines which are provided with threadand cord-trimming mechanism such as disclosed in U. S. Patent No. 1,711,483, of May '7, 1929; the actuation of the thread-cutter B1 is dependent upon the actuation of the lever 88, by the cam 89 in the gear 34 on the cross-shaft 33. It is desirable that the safety-lever be held in safety-position by the barrel-cam 19 until the work-clamp has been returned to initial position, the stitch-forming mechanism reversely rotated to initial position, and until the thread-cutter scissors 81 have been advanced to cut the thread and retracted, so that the buttonhole-cutting mechanism cannot possibly be operated while any part of the machine is in position to clash therewith. To this end, the follower-extension 82 of the safety-lever arm 83 is formed at its trailing end-portion with an angular shoulder 82', Fig. '5, which, when released by the drop-oif shoulder SI of the cam 19, allows the safety-arm 85 to suddenly drop to the position shown in Fig. 7, ready to begin another cycle of operations. The shoulder 8! is timed to pass the shoulder 82' after the cross-shaft 33 and all parts actuated thereby have been restored substantially to starting position, clear of the field of action of the buttonholecutter levers 44, 45.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a buttonhole sewing machine, buttonholecutting mechanism including a cutter-shaft, buttonhole-working mechanism, power means to drive said mechanisms, said buttonhole-working mechanism including stitch-forming mechanism, a work-clamp, a feed-wheel making one complete rotation per buttonhole-producing cycle of the machine, said feed-wheel being connected to relatively move the stitch-forming mechanism and work-clamp to sew about a buttonhole and to relatively shift the stitch-forming mechanism and work-clamp into and out of sewing relation prior and subsequent to the sewing period, a clutch device including a cutter-starter movable to a running position to start the operation of the buttonhole-cutting mechanism, spring-biased cutter-starter blocking means, a cam connected with the feed-wheel and having a long circular portion with connections to hold said blockln means in cutter-starter blocking position, said cam having an abrupt drop-oil shoulder to release said blocking means instantly and permit the lat ter to move under the influence of its spring out of the path of said cutter-starter at the end of a buttonhole-producing cycle of operations or" the machine.

2. In a buttonhole sewing machine, buttonhole-cutting mechanism including a cutter-shaft, buttonhole-working mechanism, power means to drive said mechanisms, said buttonhole-working mechanism including stitch-forming mechanism, a work-clamp, a feed-wheel making one complete rotation per buttonhole-producing cycle of the machine, said feed-wheel being connected to relatively move the stitch-forming mechanism and work-clamp to sew about a buttonhole and to relatively shift the stitch-forming mechanism and work-clamp into and out of sewing relation prior and subsequent to the sewing period, a clutch device including a cutter-starter movable to a running position to start the operation of the buttonhole-cutting mechanism, spring-biased cutter-starter blocking means, a cam connected with the feed-wheel and having a long circular portion with connections to hold said blocking means in cutter-starter blocking position, said cam having a sudden drop-off to release said blocking means and permit the latter to move out of the path of said cutter-starter at the end of a buttonhole-producing cycle of operations of the machine, means actuated by the button-hole cutter shaft to initially move said cutter-starter blocking means to blocking position, and means actuated by the buttonhole-cutter shaft to start the buttonhole working mechanism.

3. A buttonhole sewing machine having, in combination, buttonho1e-cutting mechanism including a cutter-shaft, buttonhole-working mechanism, the latter mechanism including stitchforming mechanism, a work-clamp and a feedwheel with connections for relatively moving the stitch-forming mechanism and Work-camp into and out of sewing relation and to sew about a buttonhole, power means to drive the buttonholecutting and buttonhole-working mechanisms, clamp-closing mechanism, clutch means including a cutter-starter movable to a running position to connect the buttonhole-cutter shaft to its power means, a cutter-starter shifter actuated by the clamp-closing mechanism, a cam on the buttonhole-cutter shaft and connections to move the cutter-starter shifter to an ineffective position, a latch to temporarily hold said shifter in said ineffective position, means actuated by the buttonhole working mechanism to trip said latch, a cam connected with the feed-wheel and having a circular portion, a follower arranged to bear upon said circular portion and take over the duty of holding said cutter-starter shifter in ineffective position when released by said latch, said cam having a sudden drop-off to permit said cutter-starter shifter to move to effective position at the end of a buttonhole producing cycle of operations of the machine.

4. A buttonhole sewing machine having, in combination, buttonhole-cutting mechanism including a cutter-shaft, buttonhole-working mech anism, the latter mechanism including stitchforming mechanism, a work-clamp, a feed-wheel with connections for relatively moving the stitchforming mechanism and work-clamp into and out of sewing relation and to sew about a buttonhole, and a cross-shaft parallel to said cuttershaft and geared one-to-one to said feed-wheel, clutch means including a cutter-starter movable to a running position to connect the cutter-shaft to its source of power, clamp-closing mechanism, a cutter-starter shifter actuated by the clamp-closing mechanism, a safety-lever arranged to move the cutter-starter shifter to an ineffective position, a cam on the cutter-shaft to so move said lever, said lever having an extension reaching to said cross-shaft, and a cam on said cross-shaft operatively related to said leverextension and having a drop-off arranged to release said lever-extension at the close of a buttonhole producing cycle.

5. A buttonhole sewing machine having, in combination, buttonhole-cutting mechanism, including a cutter-shaft, buttonhole-working mechanism, the latter including stitch-forming mechanism, a stop-motion device therefor including a tilting stop-motion lever, a work-clamp, a feedwheel with connections for relatively moving the stitch-forming mechanism and work-clamp into and out of sewing relation and to sew about a buttonhole, power means to drive the buttonholecutting and buttonhole-working mechanisms, clamp-closing mechanism, clutch means including a cutter-starter movable to a running position to connect the cutter-shaft to its power means, a cutter-starter shifter actuated by the clamp-closing mechanism, a cam on the cuttershaft and connections to move the cutter-starter shifter to an ineffective position, a latch to temporarily detain said shifter in said ineffective position, latch-tripping means actuated by the tilting motion of the stop-motion lever to stitchforming mechanism starting position, a cam connected with the feed-wheel and having a circular portion, a follower arranged to bear upon said circular portion and take over the duty of holding said cutter-starter shifter in ineffective position when released by said latch, said cam having a sudden drop-off to permit said cutterstarter shifter to move to effective position at the end of a buttonhole producing cycle of operations of the machine.

6. A buttonhole sewing machine having, in combination, buttonhole-cutting mechanism including a cutter-shaft, buttonhole-working mechanism, the latter mechanism including stitchforming mechanism, a work-clamp and a feedwheel with connections for relatively moving the stitch-forming mechanism and workclamp into and out of sewing relation and to sew about a buttonhole, power means to drive the buttonhole-cutting and buttonhole-working mechanisms, clamp-closing mechanism, clutch-means including a cutter-starter movable to a running position to connect the cutter-shaft to its power means, a cutter-starter shifter actuated by the clamp-closing mechanism, a safety-lever fulcrumed on an axis parallel to said cutter-shaft and arranged to move said cutter-starter shifter to an ineffective position where it may idly perform the motion imparted to it by an untimely operation of the clamp-closing mechanism, a cam on the cutter-shaft arranged to move said safetylever to safety position, means to detain said safety-lever in safety position after said cuttershaft has operated, means on said safety-lever to block movement of said cutter-starter to cutter-starting position when said safety-lever is in safety position, and means to release said safetylever at the close of a buttonhole-producing cycle of operations of the machine.

7. A buttonhole sewing machine having, in combination, buttonhole-cutting mechanism including a cutter-shaft, buttonhole-working mechanism, the latter mechanism including stitchforming mechanism, a work-clamp and a feedwheel with connections for relatively moving the stitch-forming mechanism and work-clamp into and out of sewing relation and to sew about a buttonhole, power means to drive the buttonholecutting and buttonhole-working mechanisms, clamp-closing mechanism, clutch-means including a cutter-starter movable to a running position to connect the cutter-shaft to its power means, a cutter-starter shifter actuated by the clamp-closing mechanism, safety means to hold said cutter-starter shifter in an ineffective position where it may idly perform the motion imparted to it by an untimely operation of the clamp-closing lever, said safety means including a pivoted element which, in safety position, blocks movement of said cutter-starter to running position, the pivotal axis of said element being transverse to the direction of the thrust imparted to said element when blocking movement of the cutter-starter.

EDWARD P. SPAINE

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