US1156249A - Sewing-machine. - Google Patents

Description

F. A READ. SEWING MACHINE.

APPLICATION HLED MAR. 31, 1915.

Patented 00%;.12, 1915.

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F. A. READ. SEWING MACHINE. APPUCATION FILED MAR .31,1915.

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Patented Oct. 12, 1915.

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FRED A. BEAT), OF LYNN, MAEZSACHUSETTS, ASSIGNOR TO THE REECE BUTTON HOLE MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

SEWING-MACHINE.

Specification of Letters Patent.

Patented net. is, 1915.

Application filed March 81, 1915. Serial No. 18,385.

'Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a specification, h ke characters on the drawing representing like )arts. I This invention relates to sewing machines of that type in which a bender is employed to make bends in the work as the stitches are formed therein and in which the needle operates to penetrate the bends in the work thereby producing a bhnd stitch. Sewing machines of this type are used for various purposes, among which may be mentioned the finishing of buttonholes. and it is a machine of tlns latter character that I have herein illustrated.

The objects of my present inventton are to provide a sewing machine of this type which is simple in construction, in Wl11t3h the overhanging arm is dispensed with, in which the bender has a right line movement toward and from the work bending groove, in which the power from the shaft which operates the bender is transmitted directly thereto through the bender carrier, and otherwise to improvesewingmachines of this type, all as will be more fully hereinafter set forth. The above objects are partially obtained by constructing the bender carrier so that it operates through the bed plate or Work- .suppogkand isdirectly acted upon by a cam on tlie driving shaft, said bender carrier being suitably guided for right line movement in a guiding element sustained by the bed plate or work-support.

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

in the drawings, Figure l is a vertical longitudinal section through a sewing machine embodying my invention; Fig. 2 is an end view of Fig. 1 with part of the frame omitted; Fig. 3 is a perspective view of the bender carrier with the bender sustained thereby; Fig. d is a section on the line XX, Fig. 6; Fig. 5 is a fragmentary plan view of the bender and bender carrier; Fig. 6 is a bottom side view of the work support and the operating mechanism; Fig. 7 is a section on the line z/2/, g. 2.

l designates the bed plate or work sup port which may form a part of the base frame or'may be a separate part sustained on a base or frame as desired. This work support or bed plate is shown as provided with the usual work-bending groove 2 with which the bender 3 coiiperates to form the bend in the material during the stitching operation. The means for operating the bender which constitutes one feature of my present invention will be more fully hereinafter described.

The-sewing machine herein illustrated is of that type in which the stitch-operating mechanism including the needle and shuttle with their operating parts-are situated beneath the worksupport, the needle reciprocating in a path parallel to the work support. The needle is shown at 4; and it is sustained by a needle bar 5 of usual construction that is mounted for reciprocation in bearings 6 carried by a needle bar carrier 7. The needle bar is given its reciprocating motion from the driving shaft 8 which is mounted in suitable bearings 9 herein shown as secured to the underside of the bed late 1, although the'bearings for the shat might be constructed and supported in any suitable way. The driving shaft is provided with a crank arm 10 having a crank pin 32 to which is connected a connecting rod 11, said connecting rod being pivotally connected to a pin 33 extending'from a cross-head 1:2 secured to the needle bar 5 and reciprocating on a guide-rod 13 carried by the needle bar. carrier. The needle bar is thus directly operated from the driving shaft 8. The needle bar carrier '2 is given a lateral vibratory motion as is frequently done in sewing machines of this character and this is provided for by pivotally mounting the carrier 7 in a frame or support comprising two members lei situated at the ends of the needle bar carrier and herein shown as con- These members 14 carry pivot pins,

at its lower edge and constituting the center about which the upper end of the needle bar carrier sustaining the needle bar The requisite vibratory motion switch cam 18 sustained by the driving shaft 8 and actuating a rocking member 19 which is connected to the-needle I bar carrier through a connecting bar. 20, all

as usual in sewing machines of this type.

It will be noted that the crank arm 10 with its crank pin 32 rotates in a fixed plane, while the cross-head 12 to which the connecting rod 11 is secured has a lateral vibratory movement. In order to accommodate this lateral motion without any binding of the parts, I propose to make the connection between the connecting rod 11 and the cross-head and crank arm 10 of the balland-socket type. For this purpose the crank pin 32 is in the form of a ball, and the end of the connecting rod 11 has a suitable socket member 34 which embraces the ball. The projection 33 extending from the cross-head 12 is also in the form of a ball, and the connecting rod 11 has a socket member embracing said ball. This makes a flexible connection between the connecting member and both the crank arm 10 and cross-head 12 which will allow for any lateral vibration of the needle carrier without any cramping or binding of the parts.

shaft 8 by two links 30 The shuttle may be either of the oscillatory or the rotary type. I have herein illustrated a machine employing a shuttle of the rotary type, and the shuttle, which is not shown herein, is sustained by a suitable shuttle carrier 22 having rigid therewith a bevel gear 23 that meshes with and is driven the shuttle-driving a bevel gear 24 on shaft This shuttle-driving shaft=e25 is ,driven from the shaft 92 which is connecteddirectly to and is driven from the driving and 31 that connect the two cranked portions 26 and 27 on the shaft 8 to two cranked portions 28and 29 on the shaft 92. Nith'this construction the two shafts will be positively tied together so that they will be compelled to rotate in unison, and there is no possibility that the correct timed relation between the shafts can be disturbed. Further, this connection is one which is well adapted for high speed work.

and is comparatively noiseless.

As stated above, I have provided herein a construction in which the bender operates with a right line movement and in which the bender carrier is mounted for sliding movement through the bed plate 1 and is directly acted upon by cams on the driving shaft 8. The bender carrier "herein illustrated is shown best in Fig. 3, and it com prises a body portion 36 which extends through the bed plate 1 and operates in suitable guideways depending from the bed through which the shaft 8 extends.

amazes plate and an arm or extension 370 in which the bender 3 is secured; Any suit-able guide member for guiding the member in its reciprocating movement may be employed. In the illustrated embodiment of my invention this guide comprises two guide plates 37 and 38 which extend through an opening 39 'in the bed plate 1 and are provided with apertures 40 and 41 through which the driving shaft 8 extends. These guide plates 37, 38 are spaced from each other by means of spacing strips 42 situated between the edges of the guide plates, and said plates are secured together by means of screws 43 extending through the guide plates and the spacing strips. This guiding member thus constructed is held in position partly by the opening 39 in the bed plate 1 and partly by the shaft 8, the shaft holding the lower end of the guiding member in pro-per position and the walls of the opening 39 in the bed plate 1 holding the upper end of the guiding member in position. The guiding member thus constructed affords a space between the guide plates 37, 3S and the spacing strips, in which the bender carrier 36 is received and reciprocates. The lower portion of the body 36 of the bender carrier is of a size to fit the space between the guide plates 37, 38, and the spacing strips 4L2, and the bender carrier is provided with the slot1F 14: he bender carrier is given its vertical reciproeating motion in the guiding member by means of a cam device carried by the shaft 8 and acting directly on the bender carrier. While any suitable cam adapted for accomplishing this endmight be employed I have hereinshown a cam comprising the two cam elements 46 and 17 between which the guiding plates 37 and 38 are situated, and by which said plates are prevented from movement longitudinally of the shaft Each cam element is adapted to engage a roll or projection secured to the bender carrier, one cam element operating to give the bender carrier its downwardor work-bending movement and theother cam element operating to give thebender its upward movement. The cam element to is that which gives the bender carrier its worlebending movement, and this cam element coiiperates with a roll l8 carried by a stud 49 secured in the cross plates 50 which are secured to and tie together the lower ends of the sides 51 of the bender carrier. The cam element 47 is shown. as hearing against a ball or roll'52 carried by a boss or projection 53 formedon the bender carrier, said roll or ball being backed by an adjusting screw 54 so that suitable adjustment may be made. With this construction the bender carrier will be given a positive movement in both directions directly from the shaft 8, and the power from the shaft 8 is thus transferred directly to the bender. The particular form of cam mechanism herein illustrated is not essential to the invention, however, as any cam mechanism by which the bender. carrier is operated directly from the shaft 8 may be emplo /ed.

The means for feeding the work and the presser foot with which machines of this type are usually equipped are not shown herein as they form no part of my present invention and any suitable devices for this purpose may be employed.

The construction I have illustrated is simple and compact and capable of high speed operation. Moreover, the construction is such that no overhanging arm is necessary to support the bender, but at the same time the bender has a right line movement which is an advantage in that the pressure of the bender against the work is always in a plane perpendicular to the work support, a result which cannot be obtained where the bender is sustained on a pivotally-mounted bender carrier.

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

I claim:

1. In a sewingmachine, the combination with a bed plate having a work-bending groove, of a bender, a bender carrier mounted for vertical sliding movement through the bed plate, and means for operating said carrier.

2. In a sewing machine, the combination with a bed plate having a work-bending groove, of a bender, a bender carrier mounted for vertical sliding movement through the bed plate, a shaft beneaththe bed plate, and cam means on the shaft for directly operating the bender carrier.

3. In a sewing machine, the combination with a bed plate having a work-bending groove, of a guiding member depending from the bed plate, a bender carrier slidable vertically insaid guiding member and through the bed plate, a bender sustained plane of the-bed plate, and means to actuate said bender carrier.

5. In a sewing machine, the combination with a bed plate having a work-bending groove, of a guiding member associated with the bed plate and depending therefrom, a bender carrier extending through the bed plate and slidr bly mounted in said guiding member for movement at right angles to the plane of the lloed plate, a shaft beneath the bed plate, and cam means on the shaft engaging and operating the bender carrier.

6. In a sewing machine, the combination with a. bed plate having a work-bending groove of a bender, a bender carrier mounted for sliding movement through the bed plate in a direction at right angles to the plane of the bed plate, and means for operating said bender carrier.

7. In a sewing machine, the combination with a. bed plate, of a needle bar carrier situated beneath the'bed plate, a needle bar mounted in said carrier for reciprocating movement, a guide member rigid with said carrier and extending parallel to the needle bar, a cross head secured to the needle bar and guided by said guide member, means to give said carrier a lateral vibratory movement, a shaft having a crank arm, and a link flexibly connected both to the crank arm and the cross head.

' In testimony whereof, I have signed my named to this specification, in the presence of two subscribing witnesses.

\FRED A. READ.

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