US1234497A

US1234497A - Trimmer for sewing-machines.

Info

Publication number: US1234497A
Application number: US82713614A
Authority: US
Inventors: Dudley S Seymour
Original assignee: Union Special Machine Co
Current assignee: Union Special Machine Co
Priority date: 1914-03-25
Filing date: 1914-03-25
Publication date: 1917-07-24
Anticipated expiration: 1934-07-24

Description

D. S. SEYMOUR.

TRIMMER FOR SEWING MACHINES.

APPLICATIONFILED MAR. 25. 1314.

Patented July 24,1912".

5 SHEETS-SHEET x.

0. s. SEYMOUR. TRIMMER FOR SEWING MACHINES.

,APPLICAT ION FILED MAR-251 I914 Patented July 24, 1917.

5 SHEET S-SHEET 2.

D. S. SEYMOUR.

TRIMMER FOR SEWING MACHINES.

APPLICATION FILED MAR.25| I914.

Patented I 111137 24:, 1917'.

5 SHEETS-SHEET 3.

D. S. SEYMOUR.

TRIMMER FOR SEWING MACHINES.

APPLICATION HLED MAR. 25, 1914.

Patented July 24, 1917.

5 SHEETSSHEET 4.

- mmmm D. S. SEYMOUR.

' TRIMMER FOR SEWING MACHINES.

APPLICATION FILED MAR.25.1914- Patented July 24,1917.

sra'rns rap limit.

DUDLEY S. SEYMOUR, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TRIMMER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented July at, 1am.

To all whom it may concern:

Be it known that I, DUDLEY S. SEYMooR, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Trimmers for Sewing- Machines, of which the following is a description, reference being had to the accom} panying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in trimmers, and more particularly to trimmers for sewing machines wherein the severing members are moved in the direction of the line of feed of the sewing machine, for either. preparing the edge for stitching, or for trimming or severing the edge during stitching. 7

An object of the invention is to provide means for operating the severing members of a trimming mechanism of the above character, so that each severing member shall be separately and positively actuated.

A further object of the invention is to provide a trimming mechanism wherein the severing members have their severing surfaces in rolling contact with one another, so as to sever the fabric by abrasion, in contradistinction to a cutting action, with means for positively and separately actuating each of the severing members.

These and other objects will in. part be obvious, and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration, one embodiment of the invention,

Figure 1 is a front view of a sewing machine having the improvements applied thereto, the work support being broken away to show the parts beneath the same;

Fig. 2 is an end view with parts of the work support broken away to show the mechanism for rocking the frame which actuates the severing members Fig. 3 is a plan view, partly in section, showing the work support removed and the mechanism for actuating the severing members;

Fig. 4 is a transverse vertical section showing the severing mechanism in side elevation; V

Fig. 5 is a perspective view, showing the severing mechanism and its relation to the needle, feed dog and presser foot;

Fig. 6 is a perspective view showing in detached relation to one another, the various elements of the severing mechanism;

Fig. 7 is a detail showing a section through the severing surfaces of the severing members; and

Fig. 8 is a detail showing the manner of taking up the thrust of the upper severing member.

The invention consists generally in a trimming mechanism which includes severing members adapted to have a rolling contact with each other. The severing surfaces of these members are so constructed that the fabric is severed by abrasion in contradistinction to a cutting action. A trimming mechanism of this general character, and containing many of the details disclosed in the drawings, is shown and described in the patent granted to E. F. Durand April 29th, 1902, No. 698,912.

According to the present invention, these severing members are so disposed as to move in a plane parallel with the line of feed of the material, and said severing members also are operated in timed relation with the feed, so as to sever the material while it is being fed to the stitching mechanism. These severing members are separately and independently operated by direct connections with the operating mechanism.

Referring more in detail to the drawings, the machine embodying the present invention consists of a bed plate 1 from which rises a standard 52 carrying an overhanging arm 3. A needle bar 1 reciprocates in the overhanging arm and carries a needle 5. The needle bar is reciprocated by a needle lever B, which is connected through a link 7 with the main shaft 8 of the machine.

The material is fed to the stitching mechanism by a feed dog 9, which is mounted on a feed bar 10. This feed bar 10 is pivoted at 11 to a feed rocker 12. The feed rocker 12 has an arm 13 rigidly attached thereto, and this arm extends around the end of the machine to a point adjacent the end of the main shaft 8. A crank 14 is ad justably attached to a disk on the end of this main shaft, and this crank is connected by a lit k 15 with the arm- 13. As the main shaft rotates, the feed rocker will be oscillated back and forth through this crank c011- nection with the arm 13.

The feed bar is raised and lowered, in

" the plate and order to bring the feed dog into and out of engagement with the f.bric by an eccentric 16 on the main shaft 8. This eccentric engages a hardened plate 19 on the under side of the feed bar, and a bracket 20 coperates with the lower face of the eccentric. This feed dog operating mechanism is of the usual construction, and further description is not thought necessary.

Co'ciperating with the needle 5 beneath the work support is a looper 21, which is also of the usual construction, and is moved into and out of the needle loop for forming a series of chain stitches. It will be understood that the present invention, which relates to the severing mechanism, is not restricted to the particular feeding mechanism herein shown, nor to the particular stitching mechanism described.

The material to be stitched is placed on the work support 22, and is held thereon by a presser foot 23, carried by a presser bar 23".

The severing mechanism consists of a supporting bracket 24, which is attached to a supporting base 25 adjustably connected to the bed plate. This bracket and the adjusting means therefor are fully shown and described in the patent above referred to. The bracket extends above the work support and forms the fulcrum support for the severing

members

26 and 27. The severing member 27 is pivoted to the bracket beneath the work support. The bracket is formed with a slot 27 inwhich the shank of the severing member is located, and a short shaft extends through the bracket and is connected to this shank at 28. The severing member 27 may be secured to this short shaft in any desired way.

The upper severing member 26 is formed with a supporting shank 29, and this supporting shank is pivotally mounted on a plate 30. A pivot screw 31 extends through the washer 30 and is screwed into the shank 29 of the severing member 26.

A plate 30 is adjustably attached to the bracket 24. Said plate is formed with vertical elongated slots 32, through which supporting screws 33 pass. The plate is also formed with an extension 34. A wedge 35 passes through a sleeve 36 carried by a bracket 37 attached to the head of the machine by suitable screws 38, and this wedge rests against the upper end of the extension 34. The extension is shaped and positioned so as to rest against the upper end of the shank 29 of this severing member 26, so that the pressure exerted on the member 26 is not dependent upon the pivot screw 31, but upon this extension 34 of the plate 30. The wedge 35 is threaded at 39, and a threaded sleeve having a thumb nut 40 thereon engages this threaded part 39. This sleeve bears against the bracket 37', and by turning the sleeve, the wedge 35 may be moved in the bracket, 30 downward and thus force the severing

members

26 and 27 into close contact with each other.

The upper face of the lower severing member 27 is a broad flat surface trans-i versely, as indicated at 41. The severing surface of the upper severing member 26,

so as to force the plate l is brought to a dull edge 42, which rests and has rolling contact on the flat surface 41. The severing surfaces of the

members

26 and 27 in the other direction, (that is, longitudinally of the members,) are curved so they may have close rolling contact with each other as the severing members are each swung about their pivotal centers. dull edge 42 is not a cutting edge, but operates to sever the fabric by a rupture 'or abrasion.

This

In order that a fabric maybe severed, these surfaces are pressed very firmly against each other, and must be held from any movement whlch would permit them to separate during the severing action.

The severlng member 27 is oscillated on its support by a link 43 aranged below the work support and pivotally connected to the severing member by a pivot bolt which is threaded into an opening 44 formed in said severing member. The other end of a link 43 is pivoted to a lug 45 on the feed bar 10 by a pivot bolt 46.

The upper severing member 26 is oscilice;

lated about its pivotal support by means separate and independent from that which oscillates the lower severing member. As

shown in the drawings, this means consists of a link 47, arranged above the work support and pivoted at one end to the upper 1 severing member 26 by a pivot bolt 48, threaded into an opening 49 in the shank of the severing member 26. The other end of this link 47 is pivoted to a lug 48 on the feed rocker'12, by a pivot bolt 49.

The supporting bracket 24 for the severing members .is provided with-a centrally lateral offset part 50,. which connects the 4 upper portion 51 of the bracket with-the lower portion 52 thereof. This upper port1on 51 and the lower portion 52 are so disposed that the link 47 is on one side of'the upper section, while the link 43 is on the other side of the other section and beneath the oflset portion 50. This permits the severing members to be rigidly supported at a v point close to the stitching needle, and the severing members are positively moved back and forth in'rolling contact with each other by these separate links, which are inde pendently connected to the feed bar'and;

feed rocker respectively.

From the above description, it will be noted that severing members have been prodetails of construction and mam vided which sever the fabric by abrasion, and these severing members are so disposed as to move in a vertical plane parallel with the line of feed. The severing members are also connected either to the feed bar or the means which reciprocates the feed bar, and, therefore, each severing member will be moved back and forth in unison and in timed relation to the movement of the feed dog. Inasmuch as the fabric is severed by this rolling action of. one severing member on the other, it is essential that the severing shall occur at the same time that the fabric is fed forward to the stitching mechanism.

These severing members are independently mounted so as to move in a plane parallel to the line of feed, and each severing member is positively and directly operated by an independent connection with a movable part of the machine. By this construction, fabrics of considerable thickness may be readily severed.

It is obvious that minor changes in the arrangement of departing from as set forth in parts may be made, without the spirit of the invention the appended claims.

aving thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A trimming mechanism including movable severing members having severing sur' faces in rolling contact with each other, an

' operating device connected to one of said severing members for actuating the same, and an operating device connected to the other severing member for actuating the same.

2. A trimming mechanism including feeding mechanism, movable severing members having severing surfaces in rolling contact with each other, means for pivotally sup porting said severing members, whereby the same may be moved in a plane parallel to the line of feed, an operating device connected to one of said severing members for actuating the same, and an operating device connected to the other severing member for actuating the same.

3. A trimming mechanism including a feeding mechanism, movable severing members having severing surfaces formed so as to sever the material by abrasion, means for pivotally supporting said severing members, said pivotal supports being one above and the other below the material to be severed and in a line substantially at right angles to the plane of the material, an operating device connected to one of said severing mem bers for actuating the same, and'an operating device connected to the other severing member for actuating the same.

4:- A trimming mechanism including a Work support, a feed dog, means for reciprocating said feed dog back and forth to feed the material, severing members located one above and the other below said work support, means for pivotally supporting said severing members, whereby the same have rolling contact with each other and are moved in a plane at right angles to the work support and parallel to the line of feed, an operating device connected to one of said severing members for actuating the same, and an operating device connected to the other severing member for actuating the same.

5. A trimming mechanism including a work support, a bracket mounted beneath the work support and projecting above the same, severing members carried by said bracket, devices located one on one side and the other on the other side of said bracket for operating the respective severing memers.

6. A trimming mechanism work support, a bracket mounted beneath the work support and extending above the same, severing members pivotally supported by said bracket, said pivotal supports being located one above and the other below the work support and in a line substantially at right angles to the work support, said severing members having surfaces in rolling contact with each other for severing the material, an operating device connected to one of said severing members for actuating the same, and an operating device connected to the other severing member for actuating the same.

trimming mechanism including a work support, a bracket mounted beneath the work support and extending above the same, severing members pivotally supported by said bracket, said pivotal supports being located one above and the other below the work support and in a line substantially at right angles to the work support, said severlng members having surfaces in rolling contact with each other for severing the material, and means for separately and independently oscillating said severing members, said means for oscillating the severing members including a link connected to one of said severing members and a separate link connected to the other severing member.

8. A trimming mechanism including a work support, a feed dog, a feed bar carrying said feed dog, a feed rocker for reciprocating said feed bar, a bracket supported beneath the work support and extending above the same, severing members having rolling contact with each other for severing the material, means for pivotally supporting said severing members 011 said bracket, one above the work support and the other below the same, a link connecting the severing member above the work support to the feed. rocker, whereby the oscillations of the feed including a rocker are positively and directly imparted to said severing member, a link connecting the severing member beneath the work support with the feed bar, whereby said severing member beneath the work support is directly and positively actuated from the feeding bar.

9. A trimming mechanism including a work support, a feed dog, a feed bar carrying said feed dog, a feed rocker for reciprocating said feed bar, a bracket supported beneath the work support and extending above the same, cooperating severing mem-' bel's means for plvotally supporting said severing members on said bracket, one above the work support and the other below the same, a link connecting the severingmember above the work support to the feed rocker whereby the oscillations of the feed rocker are positively and directly imparted Copies of this patent may be obtained for to said severing member, a link connecting the severing member beneath the work support with the feed bar whereby said severing member beneath the work support is directly and positively actuated therefrom.

10. A trimming mechanism, including movable severing members having severing surfaces in rolling contact with eachother, an actuating member, a device connecting said actuating member to one of said severing members, and .a device for connecting the actuating member to the other severing member, whereby said severing members are independently moved in unison.

In testimony whereof, I afiix my signature, in the presence of two witnesses.

DUDLEY S. SEYMOUR. Witnesses:v

A. F. BR DSHALL, F. C. BUTLER.

five cents each, by addressing the Cloinmissioner of Patents, Washington, D. G. Y r