US1652413A

US1652413A - Trimming mechanism for sewing machines

Info

Publication number: US1652413A
Application number: US730801A
Authority: US
Inventors: John C Ringe
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1924-08-08
Filing date: 1924-08-08
Publication date: 1927-12-13
Anticipated expiration: 1944-12-13

Description

Dec. 13, 1927. 1,652,413

. J.-c. RINGE TRIMMING MECHANISM FOR SEWING MACHINES Filed Aug. 8, 1924 2 Sheets-Sheet 1 INVENTOR J15) (Lei/ye ATTORNEY WITNES s Mm Dec. 13, 1927.

J. C. RINGE TRIMMING MECHANISM FOR SEWING MACHINES Filed Aug. 8, 1924 2 Sheets-Sheet 2 INVENTOR Join we; a

ATTORNEY Patented Dec. 13, 1927. o

UNITED STATES PATENT OFFICE.

JOHN C. RINGE, OF STRATFORD,

CONNECTICUT, A SSIGNOR TO THE SINGER MAN UFAC- TURIN G COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TRIMMING MECHANISM FOR SEWING MACHINES.

Application filed August a, 1924. Serial No. 730,801.

This invention relates to improvements in trimming mechanisms for sewing machines and has for its primary object to provide a trimming mechanism in which a reciprocatory trimmer blade performs its work-severing action during the effective action of the work-feeding means.

More specifically, the present invention has for an object to provide a sewing machine having continuously effective workfeeding means with trimming mechanism of the reciprocating-blade type, which trimming mechanism is preferabl capable of being thrown into and out of e ective action during the operation of the machine.

Another object of this invention is to provide a needle-feed machine, i. e., a machine wherein the endwise reciprocating needle has a lateral movement in the line of seamformation while in the work, with a trimming mechanism of the reciprocating-blade type which is effective to sever the work during the lateral feeding movement of the needle.

Other objects of the invention will be apparent from the following description and claims.

The present improvement has been cm-' bodied in a continuous-feed sewing machine substantially as disclosed in the U. S. Patent to H. Corrall and B. A. Stevens, No. 1,414,625, May 2, 1922, wherein the work is continuously advanced past the stitch-forming mechanism. The improvement comprises a trimming mechanism of which the trimmer-blade has a cutting-edge disposed to reciprocate in a plane substantially parallel with the line of seam-formation. The trimmer-blade is carried by a trimmer-bar slidingly mounted for endwise reciprocation upon the swinging needle-bar frame, whereby during its work-severing action the trimmerblade is vibrated laterally in timed relation with respect to and in the direction of the advancing movement of the work, i. e., in unison with the advance of the work. To reciprocate the trimmer-bar, it is releasably connected with mechanism operated from the needle-bar reciprocating shaft and when disconnected from its actuating mechanism the trimmer-bar is raised by a spring into an inoperative position.

In the accompanying drawings, Fig. 1 is a longitudinal sectional view of a sewing machine in which the present improvement which may be adjustable in any well known has been embodied. Fig. 2 is an end view of the needle-head of the machine with the face plate removed.

Fig. 3 is a longitudinal section of the head of the overhanging bracket-arm of the sewing machine.

Fig. 4 is a perspective view of the trimming mechanism. Fig. 5 is a plan view of the throat-plate.

Referring to the drawings, the sewing machine shown is provided with a bed-plate l, the upper surface of which serves as a clothplate. Rising from the bed-plate is the hollow standard 2, curving laterally into the overhanging arm 3 terminating in the head 4. Suitably journaled in the overhanging arm is the main or needle-reciprocating shaft 5 carrying at one end the belt-wheel 6 and at its opposite end the shaft-flange 7, provided with a crank-pin 8. 'Embracing the crank-pin 8 is the apertured and laterally offset end of the link 9 of which the opposite end is connected in a likeamanner with the stud 1O projecting from the collar 11 suitably clamped upon the needle-bar 12.

The needle-bar 12 carries the needle 13 and is journaled for vertical reciprocation in spaced bearings, as 14, provided in the swinging frame 15 pivotally supported at its upper end upon the stud 16 secured in the head 4. In order to impart swinging movements to the frame 15, the lower of the spaced bearings 14 is suitably connected with a crank-arm 17 on one end of the rockshaft 18, journaled in bearings provided in the overhanging arm. The rock-shaft 18 is disposed substantially parallel to the driving shaft 5 and has secured thereupon the forked arm 19 actuated by the eccentric 20,

manner to vary the throw of the arm 19. Through the described operating mechanism, the needle-bar 12 evidently receives endwise reciprocating and laterally vibratory movements, the extent of lateral movement being loo adjustable. The needle-thread take-up employed may be of any suitable construction and need not be described herein.

Adjacent the eccentric 19 the driving shaft 5 carries a bevel gear 21 meshing with a similar gear 22, carried by the upper end of a vertical, intermediate shaft 23, journaled at its upper end in a bearing provided in a lug- 24 upon the standard 2. At its lower end. the shaft 23 is journaled in a bearing 25 formed in the frame of a housing 26 suitably secured to the bed-plate 1. Within the opening 27 aiforded by the frame of the housing 26, the shaft 23 carries a worm 28 and a evel-gear 29. The worm 28 drives a worm-wheel 30 secured upon a substantially horizontal feed-wheel actuating shaft 31 journaled at its rearward end in a bushing 32 suitably secured in an aperture provided in the frame of the housing 26. The bevel gear 29 meshes with a similar gear 33 carried by the rearward end of the loop-taker actuating shaft 34 journaled in a bushing 35 suitably secured in the housing 26. The opening 27 of the housing 26 may be packed with lubricant and is closed by detachable plates 36 and 37 secured in any suitable manner upon the frame of the housing. The lo0p-taker actuating shaft 34 extends substantially parallel to the driving shaft 5 and is journaled at its forward end in the bushing 38 secured by set-screw 39 in a suitable a erture provided in a second housing 40. bevel gear 41 carried by the forward end of the shaft 34 and located in an opening 42 afforded by the housing 40, meshes with a similar gear 43 suitably secured upon a vertical loop-taker carrying shaft 44. The shaft 44 is journaled for rotation in the housing and at its upper end carries a loop-taker 45 of a well known type containing a mass of under thread around which the loop of needle-thread is cast. The bevel gears 41, 43 are of a ratio whereby the vertical loop-taker shaft receives tworotations to one rotation of its driving shaft.

The forward end of the feed-shaft 31 is journaled in the housing 40 and carries a spur-gear 46 meshing with a similar gear 47 from which the feed-wheel 48 derives continuous rotary movements during the operation of the machine. The supporting means for the feed-wheel may be of the same character as that fully described in the prior Patent No. 1,414,625, before referred to, said feed-wheel 48 projecting through a slot in the throat-plate 49 to engage and advance the work. Opposed to the feedwheel is a rollerresser 50 carried by the lower end of a presser-bar 51, journaled for endwise movement in the head 4 and which Presser-bar may be depressed in any suitable manner to cause said roller-Presser 50 to 1yieldingly engage the work.

eferring now more particularly to the present improvement, the rear side of the swinging frame 15 is provided with spaced flat-surfaced lugs, as 52, providing slideways for the lateral ears as 53. of a trimmerbar 54, said ears having vertically disposed elongated ide-slots, as 55. The trimmerbar is guided for endwise reciprocatory movements upon the frame 15 by screws, as 56, passing through the guide-slots and threaded into the lugs 52, and is further guided by a lateral extension 57 of the frame guide-bracket 58. To the lower end of the trimmer-bar 54 a trimmer-blade 59 of the chop-trimmer type is secured by means of screws, as 60, for lateral adjustment, 9. finger-piece 61 being suitably secured upon the trimmer-blade to facilitate manual depression of the trimmer-bar into operative position. The trimmer-blade 59 is provided with the usual inclined cuttin edge 62 and with the guide-projection 63, t e latter in the operative osition of the blade entering an elongated slot 64 rovided in the throat-plate 49. The blade-e ge 62 cooperates with the edge 65 of a defining wall of the slot 64 in the throat-plate, said edge 65 constituting in effect a ledger-blade. A spring-pressed follower 66 pivotally supported on the throatplate and which may be of any usual form is preferabl employed to close the slot 64 in the raise' position of the trimmer-blade.

At its upper end, the trimmer-bar 54 has a ball-joint connection 67 with a slide-bar 68, confined to endwise movement in the head 4 and carrying at its upper end a lateral extension 69 overlying a rod 70. Z0 is journaled for endwise movement within the hollow upper end of the resser-bar 51 and is normally urged upwardly by a spring 71 within said Presser-bar, whereby when the trimmer-bar is disconnected from The rod its actuatin mechanism, it is lifted to and f yieldingly eld in an inoperative position determined by the engagement of the lower ends of the slots 55 with the screws 56.

In order toimpart endwise reciprocatory movements to the trimmer-bar 54 upon the vibratory frame 15, said trimmer-bar is provided with a slot 72 adapted to be entered y a roller 7 3 carried by t e free end of an arm 74 extending laterally from one end of a rock-shaft 75. This shaft 75 is 'journaled for rocking and endwise slidin movements in bearing lugjs, as 76, provide on the rear side of the r Suitably secured upon the rock-shaft 7 5 is an arm 77 havin acket-arm of the machine.

a fork straddling an ec-I centric 78 upon t e main-shaft 5 of the ma-' chine. The 'rock-shaft-75 may be shifted endwise to connect and disconnect the roller} i 73 from the trimmer-bar and to this end there is provided a manually operable leverflv 79, 80 secured u on a fulcrum-pin 81 jour-' of said lever extends forwardly underneath nale'd upon the racket-arm 3. The 'arm179 the bracket-arm 3 for convenient manipula'r tion thereof, and the other arm 80 of said 5 r lever is engaged y a Spring 82 functioning A to yieldingly maintain connected the trimmer-bar and its reciprocatin mechanism.

Projecting from the arm 79 0 said lever is a forked lug 83 straddling the grooved end of the shaft 75, whereby movements of said lever 79, 80 are transmitted to the rock-shaft.

During the endwise movements of the rockshaft, the forked arm 7 7 slides upon the eccentric 78 and consequently the shaft 75 is constantly rocking during the operation of the machine regardless of whether or not the trimmer-bar is connected therewith.

The present improvement evidently retains all of the advantages inherent in a trimmer of the reciprocating-blade type and overcomes the difficulty heretofore present in this type of trimmer in that it may effect its work-severing action in unison with the feed of the work by reason of the fact that the trimmer-blade is vibrated laterally during its work-severing action in the direction of movement of the advancing work.

Having thus set forth the nature of the invention, what I claim herein is 1. In .a sewing machine, in combination, stitch-forming mechanism including a reciprocatory needle, means for reciprocating said needle, means for continuously feeding the work during the reciprocations of said needle, an endwise reciprocatory trimmerbar, a trimmer-blade carried by the trimmer-bar, and means for reciprocating said trimmer-bar independently of the reciprocations of the needle during the action of said work-feeding means.

2. In a sewing machine, the combination with stitch-forming mechanism, work-feeding mechanism including a work-advancing feed-wheel, and means for continuously rotating said feed-wheel to continuously advance the Work during the operation of the machine, of an endwise reciprocatory trimmer-blade, means for reciprocating said blade to effect a work-severing operation, and means for laterally vibrating said blade in the direction of feed during the worksevering action of said blade.

3. In a sewing machine, the combination with stitch-forming and work-feeding mechanism including an endwise reciprocating needle laterally movable while in the work in the direction of the line of seamformation, and means for actuating said needle, of a reciprocatory trimmer-blade having its cutting edge disposed substantially parallel with the line of seam-formation and laterally movable during its work-severing action in unison with the advance of the work, and means for reciprocating said trimmer-blade.

4. In a sewing machine, the combination with stitch-forming and Work-feeding mechanism including a work-penetrating endwise-reciprocating needle laterally movable while in the work in the direction of the line of seam-formation, and means for actuating said needle, of a chop-trimmer for severing the work, and means for actuating said trimmer to effect its work-severing action during said lateral movements of the needle.

5. In a sewing machine, in combination,

stitch-forming mechanism including a reciprocatory needle, means for reciprocating said needle, means for continuously feeding the work during the reciprocations of said needle, a trimmer-blade carrying bar, a vibratory frame upon which said bar is mounted for endwise reciprocation, means for vibrating said frame in the direction of the line of seam-formation, and means for reciprocating said bar upon said frame.

6. In a sewing machine, in combination, stitch-forming mechanism including a needle-carrying bar, a vibratory-frame upon which said needle-bar is journaled for endwise reciprocation means for vibrating said frame, a trimmer-blade carrying bar mounted upon said frame for endwise reciprocation, and means for reciprocating the trimmer-bar.

7. Trimming mechanism for sewing machines comprising a trimmer-blade carrying bar, a vibratory frame upon which said bar is mounted for endwise reciprocation thereupon, means for vibrating said frame in the direction of the line of seam-formation, means for reciprocating said bar upon said frame, and means for throwing said bar into and out of operation independently of the vibratory movements of said frame.

8. Trimming mechanism for sewing machines comprising a trimmer-blade carrying bar, a vibratory frame upon which said bar is journaled for endwise reciprocation, means for vibrating said frame in the direction of the line of seam-formation, means for reciprocating said bar upon said frame, and manually cont-rolled means for disconnecting said bar from its reciprocating means during the operation of the machine.

9. Trimming mechanism for sewing ma chines comprising a trimmer-blade carrying bar, a vibratory frame upon which said bar is journaled for endwise reciprocation, means for vibrating said frame in the direction of the line of seam-formation, means for reciprocating said bar upon said frame, manually controlled means for disconnecting said bar from its'reciprocating means, and yielding means for shifting the disconnected trimmer-bar into an inoperative position.

10. In a sewing machine, the combination with stitch-forming mechanism, and workfeeding mechanism continuously advancing the work during the operation of the machine, of a trimming mechanism including a trimmer-blade moving laterally during its work-severing action in unison with the ad Vance of the work under the action of said work-feeding mechanism and means for actuating said trimmer-blade.

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

JOHN C. RINGE.