US1844462A - Buttonhole sewing machine - Google Patents

Description

Feb. 9, 1932. J. w. CONNORS BUTTONHOLE SEWING MACHINE Filed Feb, 28, 1930 I5 Sheets-Sheet q\ a r. m m/ m T A N 4 /..m Vv nnv k M M n M in O U h v Feb 9, 1932. J, w, CCNNGRs 1,844,462

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Patented Feb. 9, 1932 UNITED STATES JOHN W. CONNORS, OI DEDHAM, MASSACHUSETTS, ASSIGNOR TO THE REECE BUTTON HOLE MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE nur'ronnonn snwine MACHINE Application filed February 28, 1930. Serial No. 432,010.

: ments moves forwardly and backwardly into and out of its cutting position.

One of the objects of the present invention is to provide a button hole cutting mechanism of this type which is simple in construction Another object of the invention is to provide a button-hole cutting mechanism of this type in which the forward and backward movement of the cutting element is derived directly from the 77 main cam of the sewing machine.

In order to give an understanding of my invention, I have illustrated herein a selected embodiment thereof which will now be described, after which the novel features will i-"u be pointed out in the appended claims.

In the drawings:

Fig. 1 is a partial side view with parts broken out of the button-hole sewing machine embodying my improvements and =3 showing the button-hole cutting mechanism in inoperative position.

Fig. 2 is a similar view showing the buttonhole mechanism in cutting position.

Fig. 3 is a plan view of the bed member with the head removed and illustrating the cam device for actuating the sliding cutting element.

In the drawings 1 indicates the head or frame carrying the stitch-forming mechanism the latter com )risin the usual u er needle 2 mounted in a vertically movable and rotatable needle bar 3, which needle operates from above the work, and also the under thread mechanism situated beneath the work The work in which the button-hole is to be stitched is retained in position during the stitching operation by work-holding means comprising the usual work clamps 5 which are pivotally mounted at 6 on a bed frame 7 on which the work is supported. The stitch-forming mechanism and work-holding means have the usual movement relative to each other in the direction of the length of the button-hole. This movement maybe secured either by moving the frame or head and the stitch-forming mechanism carried thereby relative to the bed plate 7 or by moving the work-holding means relative to the stitch-forming mechanism.

The button-hole cutting mechanism, with which the present invention is particularly identified comprises the usual two cutting elements 8 and 9, one of which may be in the form of a cutter and the other of which may be in the form of a cutting block against which the cutter operates, the cutter element 8 being situated above the work while the cutting element 9 is located below the work. Either of these cutting elements may have the cutting edge and as herein illustrated the element 9 is the cutter while the element 8 is in the form of a cutting block.

i The cutting block Sis mounted on the cutter lever 10 which is pivoted at 11 to the frame, said lever extending to the rear of the pivot and being providedwith a toe portion 12 which is engaged by a cutter cam 13 mounted on the face of the main cam 14 by which the operations oi? the machine are controlled, this being the usual construction in button-hole sewing machines. The cutting element 9 is mounted to move forwardly and backwardly and is herein shown as carried by a block 15 which is slidably mounted in ways 16 formed on the under portion 17 of the frame 1. When the stitch-forming mechanism is operating the cutter element 9 will be in its retracted position shown in Fig. 1 and will thus be out of the way of the stitchits raised position shown inFig. 1 to the position shown in Fig. 2 by reason of the cam 13 engaging the toe 12. The movement of the cutting elements from their open or inoperative position shown in Fig. 1 to their closed or operative position shown in Fig. 2 results in cutting the button-hole slit in the work.

This sliding movement of the block 15 is derived directly from the main cam 14 and for this purpose said block is formed with a I rearward extension 18 which is provided with a dopending portion 19 carrying aroll or follower 20 which operates in a cam groove 21 formed in the upper face of the main cam 14.

This cam groove is so shaped as to give the block 15 the requisite forward sliding movethe block having an extension carrying a follower operating in said groove and means for actuating said lever in timed relation with the movement of the block.

In testimony whereof, I have signed my name to this specification.

Y JOHN W. CONNORS.

ment at the proper time in the button-hole sewing cycle, said forward movement occurring at the same time that the cam 13 gives the cutter lever 10 its cutting movement. The block 15 is solidly supported in the ways 16 in all positions, hence in its forward operative position it presents a firm unyielding support for the cutting element 9. Furthermore, by connecting the block directly to the cam 14 the movement of the block toward and from its operative position will be a ositive one and as the camprojection 13 w i-ch actuates the cutting lever 10 is also carried by the cam 14 it follows that the action of the two cutting elements will always be correctly timed relative to each other.

While I have illustrated herein a selected embodiment of my invention, I do not wish to be limited to the constructional features shown.

I I claim.

1. In a button-hole sewing -machine,the combination with stitch-forming mechanism, of a button-hole cutting mechanism comprising two co-operative cutting members, a lever on which one of s'aid'members is mounted a'sliding block on which the otherelem'ent is mounted and which is movable relative to the 1 lever in the direction of the length of the button -hole into and out of operative position, i

block, said block having a follower connected therewith which operates in the groove.

8. In a button-hole sewing machine, the

combination with stitch-forming mechanism,

of a button-hole cutting mechanism comprismg two cutting e lements, one situated above

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