EP0086794B1 - A loop-taker mechanism in a sewing machine - Google Patents
A loop-taker mechanism in a sewing machine Download PDFInfo
- Publication number
- EP0086794B1 EP0086794B1 EP82902474A EP82902474A EP0086794B1 EP 0086794 B1 EP0086794 B1 EP 0086794B1 EP 82902474 A EP82902474 A EP 82902474A EP 82902474 A EP82902474 A EP 82902474A EP 0086794 B1 EP0086794 B1 EP 0086794B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bobbin case
- bracket
- loop
- bobbin
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
- D05B57/265—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices for looptakers with vertical axis
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2207/00—Use of special elements
- D05D2207/05—Magnetic devices
- D05D2207/06—Permanent magnets
Definitions
- the present invention relates to a loop-taker mechanism in a sewing machine including an arrangement for facilitating the guiding of the upper thread loop around a bobbin and a bobbin case journalled in a rotating hook.
- the present invention prevents a solution for achieving an open way for the thread through the mechanism without using any price raising, complicating members.
- two magnets are used which are positioned opposed to each other, one being fastened in the bobbin case and one in an especially designed bobbin case bracket, which bracket replaces the holder arm used in the former designs.
- US-A-2,394,369 and GB-A-747,5278 it is known to use a magnetic force in loop-takers in sewing machines. In these cases, however, the magnets are used for keeping bobbin cases in holders by the attraction of the magnet, thus not for forming a fissure between the loop-taker and the bobbin case.
- the improved properties of the arrangement here referred will according to the invention appear, when the arrangement is carried out in accordance with the characterizing clause of Claim 1.
- FIG. 1 shows a vertical cross section A-A through such a loop-taker mechanism
- Fig. 2 is a horizontal projection of the mechanism
- Fig. 3 is a partial cross section B-B showing a bobbin, a bobbin case and a bobbin case bracket.
- a hook 1 (Figs. 1 and 2) is provided with a toothed wheel 2 which by means of a driving belt or shaft makes the hook rotate in the direction of the arrow (Fig. 2) around a fixed shaft 3 positioned in the body 4 of the machine.
- a bobbin case 5 and a bobbin 6 are journalled in a cavity 7 of the hook.
- the bobbin case is retained in the hook by means of a pin 8 and a bobbin case bracket 9 fixed on the body 4 at a distance to the bobbin case 5 such that the upper thread 10 when caught by a hook tip 11 can be guided by the latter around the bobbin case in a manner known per se.
- the bobbin case bracket 9 being at a distance 12 from the bobbin case, is in the shown embodiment provided with two lugs 13, 14 keeping the bobbin case in the proper vertical position and with another lug 16 keeping the bobbin case laterally.
- the lugs are located on the bracket so that the upper thread loop passes a fissure 15 when guided around the bobbin case.
- the bobbin case is also provided with a magnet 17 and the bracket with a magnet 18 with equal poles (N-N) of the magnets facing each other, as shown in Fig. 3.
- one magnet can be a horse shoe magnet and the other magnet be positioned with opposed poles between the poles of the horse shoe magnet so that the thread can be pulled through the U-shaped fissure between the two magnets.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Description
- The present invention relates to a loop-taker mechanism in a sewing machine including an arrangement for facilitating the guiding of the upper thread loop around a bobbin and a bobbin case journalled in a rotating hook.
- In a generally used design of a loop-taker mechanism with a rotating hook member friction forces in the journalling surfaces develop a torque on the bobbin case. The torque is counteracted by a holder arm preventing. the bobbin case from rotating in the machine. As the upper thread loop has to pass between the holder arm and the bobbin case an essential force is required in the upper thread for guiding the loop around the bobbin case. A general solution for decreasing this force is the arrangement of a movable arm which temporarily swings back the bobbin case so that a fissure is formed between the holder arm and the bobbin case at the moment when the upper thread passes. Such an arm is space demanding and raises the cost of the mechanism. Moreover, it will require an accurate adjustment.
- The present invention prevents a solution for achieving an open way for the thread through the mechanism without using any price raising, complicating members. Instead, according to the invention two magnets are used which are positioned opposed to each other, one being fastened in the bobbin case and one in an especially designed bobbin case bracket, which bracket replaces the holder arm used in the former designs. From other patent specifications (US-A-2,394,369 and GB-A-747,528) it is known to use a magnetic force in loop-takers in sewing machines. In these cases, however, the magnets are used for keeping bobbin cases in holders by the attraction of the magnet, thus not for forming a fissure between the loop-taker and the bobbin case. The improved properties of the arrangement here referred will according to the invention appear, when the arrangement is carried out in accordance with the characterizing clause of
Claim 1. - An embodiment of a loop-taker mechanism according to the invention provided with a hook rotating in a horizontal plane beneath the needle of the sewing machine will be described in the following with reference to the accompanying drawing in which Fig. 1 shows a vertical cross section A-A through such a loop-taker mechanism, Fig. 2 is a horizontal projection of the mechanism and Fig. 3 is a partial cross section B-B showing a bobbin, a bobbin case and a bobbin case bracket.
- A hook 1 (Figs. 1 and 2) is provided with a
toothed wheel 2 which by means of a driving belt or shaft makes the hook rotate in the direction of the arrow (Fig. 2) around a fixed shaft 3 positioned in thebody 4 of the machine. Abobbin case 5 and abobbin 6 are journalled in a cavity 7 of the hook. The bobbin case is retained in the hook by means of apin 8 and abobbin case bracket 9 fixed on thebody 4 at a distance to thebobbin case 5 such that theupper thread 10 when caught by ahook tip 11 can be guided by the latter around the bobbin case in a manner known per se. - The
bobbin case bracket 9 being at adistance 12 from the bobbin case, is in the shown embodiment provided with twolugs lug 16 keeping the bobbin case laterally. The lugs are located on the bracket so that the upper thread loop passes afissure 15 when guided around the bobbin case. The bobbin case is also provided with amagnet 17 and the bracket with amagnet 18 with equal poles (N-N) of the magnets facing each other, as shown in Fig. 3. - When the thread loop is guided around the bobbin case the friction force on the thread in the journalling surfaces of the cavity 7, due to the masses of the bobbin case and the bobbin and also the friction of the thread loop when passing the top surface of the bobbin case will reduce the
distance 12 so that that the pulling force in the thread must increase in order to make the thread run in the fissures between the bracket and the bobbin case when leaving thehook tip 11 at a point 19 (Fig. 2) The two magnet poles N,N repel each other and counteract the reduction of thedistance 12 so that the force in the thread need not be increased to any essential degree. - The described embodiment is an example of a realization of the invention. Of course modifications are possible without departing from the inventive idea. The invention can thus be applied to other types of loop-taker mechanisms than the shown one and the disposition of the
magnets
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8105165A SE441934B (en) | 1981-09-01 | 1981-09-01 | GRIPARM MECHANISM IN A SEWING MACHINE |
SE8105165 | 1981-09-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0086794A1 EP0086794A1 (en) | 1983-08-31 |
EP0086794B1 true EP0086794B1 (en) | 1985-08-14 |
Family
ID=20344469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82902474A Expired EP0086794B1 (en) | 1981-09-01 | 1982-08-11 | A loop-taker mechanism in a sewing machine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0086794B1 (en) |
JP (1) | JPS58501362A (en) |
AU (1) | AU561735B2 (en) |
DE (1) | DE3265422D1 (en) |
SE (1) | SE441934B (en) |
WO (1) | WO1983000886A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61176397A (en) * | 1985-01-30 | 1986-08-08 | 株式会社廣瀬製作所 | Rotary hook |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2394369A (en) * | 1943-09-13 | 1946-02-05 | White Sewing Machine Corp | Rotary loop taker for sewing machines |
US2608945A (en) * | 1947-11-01 | 1952-09-02 | Hagquist Arne | Electromagnetic shuttle for sewing machines |
US2784690A (en) * | 1953-04-09 | 1957-03-12 | Brandt Kurt | Bobbin-canister gripper arrangements for sewing machines |
-
1981
- 1981-09-01 SE SE8105165A patent/SE441934B/en not_active IP Right Cessation
-
1982
- 1982-08-11 JP JP57502500A patent/JPS58501362A/en active Pending
- 1982-08-11 WO PCT/SE1982/000256 patent/WO1983000886A1/en active IP Right Grant
- 1982-08-11 AU AU87686/82A patent/AU561735B2/en not_active Ceased
- 1982-08-11 EP EP82902474A patent/EP0086794B1/en not_active Expired
- 1982-08-11 DE DE8282902474T patent/DE3265422D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
SE441934B (en) | 1985-11-18 |
AU561735B2 (en) | 1987-05-14 |
SE8105165L (en) | 1983-03-02 |
AU8768682A (en) | 1983-03-28 |
JPS58501362A (en) | 1983-08-18 |
WO1983000886A1 (en) | 1983-03-17 |
EP0086794A1 (en) | 1983-08-31 |
DE3265422D1 (en) | 1985-09-19 |
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