GB984090A - Improvements in or relating to thread cutting mechanisms of lockstitch sewing machines - Google Patents
Improvements in or relating to thread cutting mechanisms of lockstitch sewing machinesInfo
- Publication number
- GB984090A GB984090A GB47049/62A GB4704962A GB984090A GB 984090 A GB984090 A GB 984090A GB 47049/62 A GB47049/62 A GB 47049/62A GB 4704962 A GB4704962 A GB 4704962A GB 984090 A GB984090 A GB 984090A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thread
- cam
- shaft
- roller
- needle
- 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
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
984, 090. Sewing machines. G. M. PFAFF A.G. Dec. 13, 1962 (Dec.13, 1961], No. 47049/62. Heading D1G. A thread-severing member in a lock-stitch sewing machine is rotatable coaxially of the looptaker and is positioned close to the surface of the latter, said member controlling a thread-clamping device and being driven by reduction gearing, the ratio of which determines the number of initial stitches, formed while the thread remains clamped, of the stitch group following the cutting operation. A rotary hook 18 is carried by a shaft 17 journalled in bearings 14, 15 and driven by gearing 12, 13 at twice the speed of an auxiliary shaft 11 driven by a belt 9 at the speed of the arm shaft 5. A thread-cutting device, 33, journalled on bearing 15, is coupled by 2 to 1 reduction gearing 30, 31 to a shaft 25 which is releasably coupled, via 2 to 1 reduction gearing 19, 20, to shaft 11. Device 33, which thereby turns, in the opposite direction to the rotary hook, through a quarter of a revolution for each stitch-forming cycle, comprises a cam disc 41. An arcuate, axially-projecting extension 38 of cam 41 is formed in its leading edge with a triangular projection 35 and a notch 36. A knife blade 39, carried by extension 38, co-operates with a knife blade 40 fixed under the throat plate 50<SP>1</SP>. Cam 41 co-operates with a follower roller 42 on a lever 44 which has a pin-and-slot connection to a thread-clamping bar 47 slidably mounted under the throat plate 50<SP>1</SP>. Shaft 25 is fixed within a hollow shaft 21 which rotates in a bearing 24 and journals gear 20. A sleeve 57, rotatable and slidable on shaft 25, has a peripheral groove 64 engaged by a roller 63 on a lever 60 normally biased by a spring 65 to engage a projection 58 on sleeve 57 with a fixed notch 59. For coupling shaft 25 to gear 20 a solenoid 71 is energized, whereas the plunger 70 actuates lever 60 for engaging diametrically-positioned projections 56 on sleeve 57 with corresponding notches 54, 55 formed in gear 20 and shaft 21 respectively. Solenoid 71 is energized, at the end of a seam, by depressing a button 76 to shift a blade 75 into engagement with a contact 77, blade 75 then being held by a member 78 on a latch bar 79. During the first quarter revolution of cam 41, roller 42 engages a cam position 41.1 to position the wedge-shaped end 51 of bar 47 adjacent the needle hole 50<SP>11</SP>. In the course of the corresponding stitch-forming cycle, projection 35 enters the thread triangle extending from hole 50<SP>11</SP> to the looptaker. The needle thread extending to the work and the bobbin thread are then lodged in the notch 36 to be drawn over the blade 40 and severed thereat by the blade 39. During part of the next quarter revolution, roller 42 engages cam portion 41. 2 to shift wedge 51 to the right of hole 50<SP>11</SP> , whereby the needle on its next descent passes through a notch 52 in bar 47. After the needle has ascended, roller 42 engages cam portion 41. 4, whereby bar 47 moves leftwards for clamping the free end of the needle thread between wedge 51 and a leaf spring 50 fixed under the throat plate 50<SP>1</SP>. During the next two needle penetrations, roller 42 remains on cam portion 41. 4 to hold the needle thread clamped while the first two stitches of the new seam are being inserted. When roller 42 re-engages cam portion 41.1 for releasing the thread end, latch bar 79 is engaged by a lobe 81 on a cam 80 rigid with or driven synchronously with cam 41 for releasing blade 75 to de-energize solenoid 71. If it is desired to insert four stitches at the beginning of a new seam while the thread end remains clamped, cam 41 is arranged to rotate once during six stitch-forming cycles, and gear 20 is formed with three equally-spaced notches 54 for co-operation with three corresponding coupling projections 56. Cam 80 may be provided with a second lobe for deenergizing solenoid 71 after the thread has been clamped, button 76 then being re-depressed to initiate formation of a new seam.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP28414A DE1147834B (en) | 1961-12-13 | 1961-12-13 | Thread trimmer on sewing machines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB984090A true GB984090A (en) | 1965-02-24 |
Family
ID=7371242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB47049/62A Expired GB984090A (en) | 1961-12-13 | 1962-12-13 | Improvements in or relating to thread cutting mechanisms of lockstitch sewing machines |
Country Status (3)
Country | Link |
---|---|
US (1) | US3173393A (en) |
DE (1) | DE1147834B (en) |
GB (1) | GB984090A (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1485427C3 (en) * | 1965-08-25 | 1982-03-11 | Union Special Gmbh, 7000 Stuttgart | Thread trimmer for lockstitch sewing machines |
US3424116A (en) * | 1965-08-25 | 1969-01-28 | Union Special Maschinenfab | Thread cutoff device for lockstitch sewing machines |
DE1660893A1 (en) * | 1966-02-25 | 1971-06-03 | Kochs Adler Ag | Thread trimmer on lockstitch sewing machines |
US3512491A (en) * | 1967-09-27 | 1970-05-19 | Kochs Adler Ag | Thread cutting mechanism for lockstitch sewing machines |
DE2062201A1 (en) * | 1970-12-17 | 1972-06-29 | Kochs Adler Ag, 4800 Bielefeld | Thread trimmer on lockstitch sewing machines |
US3701329A (en) * | 1971-01-04 | 1972-10-31 | Honeywell Inf Systems | Stitch control mechanisms and thread cutter |
JPS5643758B2 (en) * | 1973-05-30 | 1981-10-14 | ||
US4181088A (en) * | 1978-03-30 | 1980-01-01 | The Singer Company | Underbed thread trimmer for sewing machines |
US4365568A (en) * | 1980-05-15 | 1982-12-28 | The Singer Company | Underbed thread trimmer and controlled single-operation cam mechanism therefor |
DE102011102928A1 (en) * | 2011-05-23 | 2012-11-29 | Pfaff Industriesysteme Und Maschinen Ag | Sewing machine with thread clamp |
CN103726241B (en) * | 2013-12-27 | 2016-08-17 | 浙江飞凤缝制设备有限公司 | Column Sewing machine with needle feed thread cutting mechanism |
CN105420947A (en) * | 2015-12-21 | 2016-03-23 | 拓卡奔马机电科技有限公司 | Thread cutting mechanism of sewing machine |
CN105780326B (en) * | 2016-05-19 | 2018-06-29 | 拓卡奔马机电科技有限公司 | The trimming driving mechanism and sewing machine of use in sewing machine |
TWM567278U (en) * | 2018-03-08 | 2018-09-21 | 吳謹明 | Structure improvement of thread cutting mechanism of sewing machine |
CN111022526A (en) * | 2019-12-13 | 2020-04-17 | 湖州益浩毛纺原料有限公司 | Brake equipment for spinning transmission for stopping shearing when spinning is abnormally disconnected |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US343992A (en) * | 1886-06-22 | Sewing-machine | ||
US757463A (en) * | 1903-06-03 | 1904-04-19 | Nat Machine Co | Thread-cutting device for sewing-machines |
US768111A (en) * | 1903-10-06 | 1904-08-23 | Washburn Crosby Co | Thread-cutter for bag-sewing machines. |
US904463A (en) * | 1907-07-13 | 1908-11-17 | Frank J Mayhew | Clutch. |
US1401973A (en) * | 1917-12-08 | 1922-01-03 | Singer Mfg Co | Thread cutter for sewing machines |
US1883654A (en) * | 1927-05-18 | 1932-10-18 | Union Special Machine Co | Thread cutter for sewing machines |
US2376417A (en) * | 1944-06-13 | 1945-05-22 | Chudner Joseph | Thread cutter |
DE1060228B (en) * | 1956-10-11 | 1959-06-25 | Pfaff Ag G M | Single thread chain stitch sewing machine |
-
1961
- 1961-12-13 DE DEP28414A patent/DE1147834B/en active Pending
-
1962
- 1962-12-12 US US244221A patent/US3173393A/en not_active Expired - Lifetime
- 1962-12-13 GB GB47049/62A patent/GB984090A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1147834B (en) | 1963-04-25 |
US3173393A (en) | 1965-03-16 |
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