EP0122690A1 - Sewing machine - Google Patents
Sewing machine Download PDFInfo
- Publication number
- EP0122690A1 EP0122690A1 EP84300883A EP84300883A EP0122690A1 EP 0122690 A1 EP0122690 A1 EP 0122690A1 EP 84300883 A EP84300883 A EP 84300883A EP 84300883 A EP84300883 A EP 84300883A EP 0122690 A1 EP0122690 A1 EP 0122690A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- presser foot
- rod
- needle
- arm
- spring
- 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.)
- Withdrawn
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Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
Definitions
- This invention relates to sewing machines, particularly of the type capable of decorative embroidery, in which an auxiliary thread is supplied to the needle to be attached by the main sewing thread to the work piece.
- the auxiliary thread is sewn flat to provide a bold line in an embroidery pattern.
- the auxiliary thread is subjected to a positive feeding action so as to be formed into loops attached to the workpiece at only one portion of each loop so as to form a looped pile embroidery.
- the looped pile produces a desirable decorative effect enabling large areas of pattern to be filled in relatively quickly.
- a problem with the known machine is that control of the formation of the loops is difficult because of the problems ot coordinating the positive feeding action of the thread to the rate of progress of the needle across the workpiece. Satisfactory loop formation is not guaranteed.
- EP-0 059 292A discloses a sewing machine having an auxiliary presser foot used in conjunction with the main presser foot to grip and release the auxiliary thread to form loops.
- the movement of the auxiliary presser foot is controlled by micro-rams set in the adjacent station of the machine. This not only requires accurate control of the rams but also reduces the working capcity and flexi- - bility of multi-needle machines.
- a sewing machine comprising a reciprocable sewing needle adapted to carry a main thread, a presser foot reciprocable with the needle into and out of contact with the fabric to be sewn, and supply means for supplying an auxiliary thread to the presser foot
- the presser foot comprises first and second relatively movable parts spring biased together so as to restrain the passage of the auxiliary thread therebetween, the parts being separable, thereby freeing the passage of the auxiliary thread therebetween, by engagement with stop means during movement of the presser foot away from the fabric.
- the needle is mounted on a vertical rod which is slidably-mounted in a support, said means for reciprocating the needle comprising a vertically reciprocating actuating arm which engages the rod on the downward stroke of the arm, and spring means are provided for biasing the rod and the presser foot upwardly away from the fabric, and the machine is characterised in that each part of the presser foot comprises a mounting arm slidably-mounted on the rod, a compression spring extends between adjacent portions of the mounting arms to bias the first part into contact with the second part, and the support carries a stop engageable by the mounting arm of the first part as the rod is moved upwardly, engagement of the stop by the said first part serving to compress the compression spring, thereby separating the two parts of the presser foot to allow the auxiliary thread to move freely therebetween.
- the spring means comprise a first compression spring surrounding said rod and extending between the support and an upper portion of the mounting arm of the first part of the presser foot, a guide arm having an upper end slidably mounted on the rod and a lower end portion passing through the upper portion of said mounting arm and having a retaining head thereon, said guide arm being retained on said rod by an enlarged head portion of said rod, and a second compression spring, less readily compressible than the first spring, extending between the upper portion of said mounting arm and the upper end of the guide arm.
- a plurality of reciprocable needle and presser foot assemblies are provided, selectively drivable by means of an actuating arm 1, as shown in Figure 1, attached to a vertically reciprocating drive shaft 2 which may be rotated about the longitudinal axis thereof so that the actuating arm 1 can engage any selected one of the assemblies.
- Each assembly comprises a vertical slide rod 3 slidably mounted in a supporting bracket 4 and carrying at the lower end thereof a needle clamp 5 holding the sewing needle 6.
- the presser foot 7 is mounted so as to reciprocate with the needle and comprises two relatively movable parts 140 and 141, the second part 141 having an upwardly extending arm 8 terminating at an intermediate point on the slide rod 3 with a portion 9 through which the rod passes.
- a slide arm 10 extends between the portion 9 and the upper end 11 of the slide rod 3.
- the slide arm 10 has a portion 10a which is attached to the upper end 11 and a downwardly extending portion 10b which passes slidably through the portion 9 of the arm 8, but has a retaining head 10c on the lowermost end thereof to prevent separation from the arm 8.
- a first helical spring 12 extends between the supporting bracket 4 and the portion 9 of the arm 8, surrounding the slide rod 3.
- a second helical spring 13 surrounds the slide rod 3 and extends between the portion 9 and the portion 10a of the slide arm 10. The first spring is more readily compressible than the second spring, so that when the upper end 11 of the rod 3 is pressed downwardly, the presser foot 7 moves with the rod until it meets the fabric on the bed of the machine. The second spring then compresses enabling the needle to be driven downwardly through the workpiece.
- the first part 140 of the presser foot 7 is mounted adjacent to the second part 141 and externally thereof.
- the first part 140 of the presser foot 7 has an upper arm 15 which passes slidably through the bracket 4 and is slidably secured to the arm 8 by means of a screw 16 passing through a vertical elongate slot (not shown) in the arm 8.
- the first part 140 is therefore movable relative to the second part 141.
- a third helical spring 17 surrounds the slide rod 3 between the arms of the two parts of the presser foot which surround the rod 3. In the position illustrated by Figure 1, this spring 17 is fully compressed.
- the main thread 20 passes through the needle and into the workpiece 21 in conventional manner.
- An auxiliary thread 22 is passed under the second part 141 of the presser foot 7 and through the needle hole in the first part 140 of the presser foot.
- the auxiliary thread may be a relatively thick thread, compared with the main thread, such as a braided thread or even a twisted woollen yarn. Since the auxiliary thread 22 passes through the needle hole in the first part 140, as a stitch is formed by the main thread, the stitch passes through the auxiliary thread, thus holding it to the workpiece 21.
- Figure 2 shows the needle and presser foot assembly at its uppermost point. A gap exists between the two parts 140 and 141 of the presser foot 7.
- Figure 3 shows the commencement of the downward stroke of the slide rod 3.
- the second part 141 of the presser foot has begun to move downwardly, but the needle 6 has not yet moved relative to that part 141.
- the third spring 17 urges the first part 140 of the presser foot upwardly and this causes the portions surrounding the needle holes to close together, thus gripping the auxiliary thread between then.
- the workpiece is moved forward by the machine, and continued downward movement of the slide rod 3 carries the gripped portion of the auxiliary thread 22 back down on to the workpiece 21, where further movement ot the slide rod 3 drives the needle downwardly through the auxiliary thread 22, thus stitching it to the workpiece 21, using the main thread 20.
- the spring 17 is arranged to have sufficient force to retain the thread during the downward movement, but to allow the auxiliary thread to be drawn through the presser foot 7 during the return upward movement thereof towards the position shown in Figure 2. Also since the first part 140 of the presser foot is drawn upwardly again by the second part 141, via the third helical spring 17, this spring will also tend to recompress and this causes separation of the portions of the feet surrounding the needle holes. The separation allows the auxiliary thread to pass tnrougn more easily in forcing a furtner loop.
- eacn needle and presser foot assembly of a multi-needle machine may be provided with a presser foot assembly as described above, and that the provision of the presser foot assembly will not impede normal operation of that assembly when the auxiliary thread is not present.
- the capacity of the machine to change from one type of thread or colour of thread to another readily during an embroidering operation will not be affected, and different colours or types of looped pile embroidery as produced by the machine in accordance with the present invention can be carried out by such a multi-needle machine.
Abstract
A sewing machine, especially a multi-head machine used for decorative embroidery, is provided with a presser foot (7), through which the sewing needle (6) passes, having two parts (140 and 141) spring-biased together to trap an auxiliary decorative thread between them. The thread is released when an upper arm (15) of one of the two parts impinges on a stop (4a) during the upward stroke of the needle and presser foot, and this permits the formation of a loop as the presser foot again descends, gripping the thread. The loops aree secured to the fabric by stitches formed in the main thread. Any stations of a multi-head machine can be modified in this way without altering the performance of any other station.
Description
- This invention relates to sewing machines, particularly of the type capable of decorative embroidery, in which an auxiliary thread is supplied to the needle to be attached by the main sewing thread to the work piece.
- In a known machine of this type, the auxiliary thread is sewn flat to provide a bold line in an embroidery pattern. In another machine, the auxiliary thread is subjected to a positive feeding action so as to be formed into loops attached to the workpiece at only one portion of each loop so as to form a looped pile embroidery. The looped pile produces a desirable decorative effect enabling large areas of pattern to be filled in relatively quickly. A problem with the known machine is that control of the formation of the loops is difficult because of the problems ot coordinating the positive feeding action of the thread to the rate of progress of the needle across the workpiece. Satisfactory loop formation is not guaranteed.
- EP-0 059 292A discloses a sewing machine having an auxiliary presser foot used in conjunction with the main presser foot to grip and release the auxiliary thread to form loops. The movement of the auxiliary presser foot is controlled by micro-rams set in the adjacent station of the machine. This not only requires accurate control of the rams but also reduces the working capcity and flexi- - bility of multi-needle machines.
- According to the present invention, a sewing machine comprising a reciprocable sewing needle adapted to carry a main thread, a presser foot reciprocable with the needle into and out of contact with the fabric to be sewn, and supply means for supplying an auxiliary thread to the presser foot, is characterised in that the presser foot comprises first and second relatively movable parts spring biased together so as to restrain the passage of the auxiliary thread therebetween, the parts being separable, thereby freeing the passage of the auxiliary thread therebetween, by engagement with stop means during movement of the presser foot away from the fabric.
- Preferably, the needle is mounted on a vertical rod which is slidably-mounted in a support, said means for reciprocating the needle comprising a vertically reciprocating actuating arm which engages the rod on the downward stroke of the arm, and spring means are provided for biasing the rod and the presser foot upwardly away from the fabric, and the machine is characterised in that each part of the presser foot comprises a mounting arm slidably-mounted on the rod, a compression spring extends between adjacent portions of the mounting arms to bias the first part into contact with the second part, and the support carries a stop engageable by the mounting arm of the first part as the rod is moved upwardly, engagement of the stop by the said first part serving to compress the compression spring, thereby separating the two parts of the presser foot to allow the auxiliary thread to move freely therebetween.
- In a preferred embodiment, the spring means comprise a first compression spring surrounding said rod and extending between the support and an upper portion of the mounting arm of the first part of the presser foot, a guide arm having an upper end slidably mounted on the rod and a lower end portion passing through the upper portion of said mounting arm and having a retaining head thereon, said guide arm being retained on said rod by an enlarged head portion of said rod, and a second compression spring, less readily compressible than the first spring, extending between the upper portion of said mounting arm and the upper end of the guide arm.
- Reference is made to the drawings, which show a portion of a sewing machine in accordance with one exemplary embodiment of the invention, and in which :
- Figure 1 is a side elevation of the reciprocating needle and presser foot assembly of the machine; and
- Figures 2, 3 and 4 show the lower portion of the assembly at three successive stages in the formation of one loop in the auxiliary thread.
- In one form of standard multi-needle embroidery sewing machine, for example that sold by Barudan Co. Limited, of Japan under the designation BEJM/UF/8-12, a plurality of reciprocable needle and presser foot assemblies are provided, selectively drivable by means of an actuating arm 1, as shown in Figure 1, attached to a vertically
reciprocating drive shaft 2 which may be rotated about the longitudinal axis thereof so that the actuating arm 1 can engage any selected one of the assemblies. - Each assembly, Figure 1 showing one example thereof, comprises a
vertical slide rod 3 slidably mounted in a supporting bracket 4 and carrying at the lower end thereof aneedle clamp 5 holding the sewing needle 6. Thepresser foot 7 is mounted so as to reciprocate with the needle and comprises two relativelymovable parts second part 141 having an upwardly extending arm 8 terminating at an intermediate point on theslide rod 3 with a portion 9 through which the rod passes. Aslide arm 10 extends between the portion 9 and theupper end 11 of theslide rod 3. Theslide arm 10 has aportion 10a which is attached to theupper end 11 and a downwardly extendingportion 10b which passes slidably through the portion 9 of the arm 8, but has a retaininghead 10c on the lowermost end thereof to prevent separation from the arm 8. A firsthelical spring 12 extends between the supporting bracket 4 and the portion 9 of the arm 8, surrounding theslide rod 3. A secondhelical spring 13 surrounds theslide rod 3 and extends between the portion 9 and theportion 10a of theslide arm 10. The first spring is more readily compressible than the second spring, so that when theupper end 11 of therod 3 is pressed downwardly, thepresser foot 7 moves with the rod until it meets the fabric on the bed of the machine. The second spring then compresses enabling the needle to be driven downwardly through the workpiece. - The
first part 140 of thepresser foot 7 is mounted adjacent to thesecond part 141 and externally thereof. Thefirst part 140 of thepresser foot 7 has anupper arm 15 which passes slidably through the bracket 4 and is slidably secured to the arm 8 by means of ascrew 16 passing through a vertical elongate slot (not shown) in the arm 8. Thefirst part 140 is therefore movable relative to thesecond part 141. A thirdhelical spring 17 surrounds theslide rod 3 between the arms of the two parts of the presser foot which surround therod 3. In the position illustrated by Figure 1, thisspring 17 is fully compressed. - In use, referring the Figures 2 to 4, the
main thread 20 passes through the needle and into theworkpiece 21 in conventional manner. Anauxiliary thread 22 is passed under thesecond part 141 of thepresser foot 7 and through the needle hole in thefirst part 140 of the presser foot. The auxiliary thread may be a relatively thick thread, compared with the main thread, such as a braided thread or even a twisted woollen yarn. Since theauxiliary thread 22 passes through the needle hole in thefirst part 140, as a stitch is formed by the main thread, the stitch passes through the auxiliary thread, thus holding it to theworkpiece 21. Figure 2 shows the needle and presser foot assembly at its uppermost point. A gap exists between the twoparts presser foot 7. - Figure 3 shows the commencement of the downward stroke of the
slide rod 3. Thesecond part 141 of the presser foot has begun to move downwardly, but the needle 6 has not yet moved relative to thatpart 141. Thethird spring 17 urges thefirst part 140 of the presser foot upwardly and this causes the portions surrounding the needle holes to close together, thus gripping the auxiliary thread between then. The workpiece is moved forward by the machine, and continued downward movement of theslide rod 3 carries the gripped portion of theauxiliary thread 22 back down on to theworkpiece 21, where further movement ot theslide rod 3 drives the needle downwardly through theauxiliary thread 22, thus stitching it to theworkpiece 21, using themain thread 20. Thespring 17 is arranged to have sufficient force to retain the thread during the downward movement, but to allow the auxiliary thread to be drawn through thepresser foot 7 during the return upward movement thereof towards the position shown in Figure 2. Also since thefirst part 140 of the presser foot is drawn upwardly again by thesecond part 141, via the thirdhelical spring 17, this spring will also tend to recompress and this causes separation of the portions of the feet surrounding the needle holes. The separation allows the auxiliary thread to pass tnrougn more easily in forcing a furtner loop. - It will be apparent that eacn needle and presser foot assembly of a multi-needle machine may be provided with a presser foot assembly as described above, and that the provision of the presser foot assembly will not impede normal operation of that assembly when the auxiliary thread is not present. Thus, the capacity of the machine to change from one type of thread or colour of thread to another readily during an embroidering operation will not be affected, and different colours or types of looped pile embroidery as produced by the machine in accordance with the present invention can be carried out by such a multi-needle machine.
Claims (3)
1. A sewing machine, comprising a reciprocable sewing needle (6) adapted to carry a main thread, a presser foot reciprocable with the needle into and out of contact with the fabric to be sewn, and supply means for supplying an auxiliary thread to the presser foot, characterised in that the presser foot comprises first and second relatively movable parts (7 and 14) spring-biassed together so as to restrain the passage of the auxiliary thread therebetween, the parts being separable, thereby freeing the passage of the auxiliary thread therebetween, by engagement with stop means (4) during movement of the presser foot away from the fabric.
2. A sewing machine according to Claim 1, wherein the needle (6) is mounted on a vertical rod (3) which is slidably-mounted in a support (4), said means for reciprocating the needle comprising a vertically reciprocating actuating arm (1) which engages the rod on the downward stroke of the arm, and spring means are provided for biassing the rod and the presser foot upwardly away from the fabric, characterised in that each part of the presser foot comprises a mounting arm slidably-mounted on the rod, a compression spring (17) extends between adjacent portions of the mounting arms to bias the first part into contact with the second part, and the support carries a stop (4a) engageable by the mounting arm of the first part as the rod is moved upwardly, engagement of the stop by the said first part serving to compress the compression spring, thereby separating the two parts of the presser foot to allow the auxiliary thread to move freely therebetween.
3. A sewing machine according to Claim 2, characterised in that the spring means comprise a first compression spring (12) surrounding said rod and extending between the support (4) and an upper portion (9) of the mounting arm (8) of the first part of the presser foot, a guide arm (10) having an upper end (10a) slidably mounted on the rod (3) and a lower end portion (10b) passing through the upper portion (9) of said mounting arm (8) and having a retaining head (10c) thereon, said guide arm being retained on said rod by an enlarged head portion (11) of said rod, and a second compression spring (13), less readily compressible than the first spring (12), extending between the upper portion (9) of said mounting arm and the upper end (10a) of the guide arm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8303958 | 1983-02-12 | ||
GB838303958A GB8303958D0 (en) | 1983-02-12 | 1983-02-12 | Sewing machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0122690A1 true EP0122690A1 (en) | 1984-10-24 |
Family
ID=10537919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84300883A Withdrawn EP0122690A1 (en) | 1983-02-12 | 1984-02-13 | Sewing machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0122690A1 (en) |
ES (1) | ES529664A0 (en) |
GB (1) | GB8303958D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1439252A1 (en) * | 2003-01-15 | 2004-07-21 | Chung-Sik Kim | A device for generating a loop or file in the embroidery frame and an embroidery frame employing the same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE142840C (en) * | ||||
US1739397A (en) * | 1927-02-23 | 1929-12-10 | Maude E Johnson | Sewing-machine attachment |
FR1028003A (en) * | 1950-08-31 | 1953-05-19 | Sewing machine | |
BE836912A (en) * | 1975-12-19 | 1976-04-16 | METHOD AND DEVICE FOR THE MANUFACTURE OF CARPET WITH STITCHED ZIG-ZAG LOOPS | |
EP0059292A1 (en) * | 1980-12-10 | 1982-09-08 | Broderie De Mesnil Saint Pere S.A.R.L. | Stitching device with two independent pressing feet, especially for realizing and sewing tuft loops |
-
1983
- 1983-02-12 GB GB838303958A patent/GB8303958D0/en active Pending
-
1984
- 1984-02-10 ES ES529664A patent/ES529664A0/en active Granted
- 1984-02-13 EP EP84300883A patent/EP0122690A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE142840C (en) * | ||||
US1739397A (en) * | 1927-02-23 | 1929-12-10 | Maude E Johnson | Sewing-machine attachment |
FR1028003A (en) * | 1950-08-31 | 1953-05-19 | Sewing machine | |
BE836912A (en) * | 1975-12-19 | 1976-04-16 | METHOD AND DEVICE FOR THE MANUFACTURE OF CARPET WITH STITCHED ZIG-ZAG LOOPS | |
EP0059292A1 (en) * | 1980-12-10 | 1982-09-08 | Broderie De Mesnil Saint Pere S.A.R.L. | Stitching device with two independent pressing feet, especially for realizing and sewing tuft loops |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1439252A1 (en) * | 2003-01-15 | 2004-07-21 | Chung-Sik Kim | A device for generating a loop or file in the embroidery frame and an embroidery frame employing the same |
Also Published As
Publication number | Publication date |
---|---|
GB8303958D0 (en) | 1983-03-16 |
ES8506365A1 (en) | 1985-01-01 |
ES529664A0 (en) | 1985-01-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19850705 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BURTON, ROY |