EP0742299A2 - Thread selecting device - Google Patents
Thread selecting device Download PDFInfo
- Publication number
- EP0742299A2 EP0742299A2 EP96107117A EP96107117A EP0742299A2 EP 0742299 A2 EP0742299 A2 EP 0742299A2 EP 96107117 A EP96107117 A EP 96107117A EP 96107117 A EP96107117 A EP 96107117A EP 0742299 A2 EP0742299 A2 EP 0742299A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- link
- arm
- thread
- pin
- knife
- 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.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C3/00—Jacquards
- D03C3/24—Features common to jacquards of different types
- D03C3/32—Jacquard driving mechanisms
- D03C3/36—Griffe operating mechanisms
Definitions
- This invention relates to an improvement of a thread selecting device such as a jacquard used in a weaving machine.
- openings are for example formed in threads, and transverse threads are passed through the openings.
- threads are held in raised positions, for which purpose a thread selecting device such as a jacquard which selects specific threads from a plurality of threads according to the pattern, and lifts them up, is installed above the weaving machine.
- the thread selecting device works in synchronism with the operating cycles of the weaving machine, for example via a link mechanism.
- the link mechanism raises a bar via an eccentric arm and an oscillating link connected to the arm.
- a plurality of knives connected to the bar individually lift needles connected to the threads.
- the raised needles are selectively held in their raised positions via hooks in response to solenoids.
- the threads are selected by selecting energizing solenoids.
- the openings in the threads vary depending on the weaving machine, and even for the same weaving machine, the required openings also vary according to thread type and stress setting for the threads used in a cloth.
- the thread openings correspond to the lifting distances of the needles, i.e. to the rising/falling distance of the knives.
- Each joint with the link arm may for example comprise an oblong hole and a link pin passing through the hole, this link pin being fixed by a bolt in one of a plurality of positions permitted by the oblong hole.
- the fixing position is varied, the distance between the link pin and link pivot point varies, and the angular range through which the link pivots, varies. In this way, the rising/falling distance of the knife is varied.
- the needle lift position may be corrected by providing a length adjusting mechanism on the bar, however the correction must be performed each time the lift distance changes, and if such a mechanism is provided, the construction of the thread selecting device is rendered more complex.
- this invention provides a thread selecting device for a weaving machine.
- the device comprises a first arm moving up and down in synchronism with an action of the weaving machine, this arm having a length, a first link connected to the first arm at a first connection point and pivoting about a predetermined point according to the moving up and down of the first arm, and a knife which is raised and lowered according to the pivoting of the first link.
- the first connection point is a first pin attached to the first arm
- the first mechanism comprises a first oblong hole formed along the first arc in the first link so as to guide the first pin along the first arc and a first fixing mechanism for selectively fixing the first pin in a plurality of positions along the first oblong hole.
- the device further comprises a second link connected to the first link via a second arm, the second link pivoting about a predetermined point according to the pivoting of the first link, a knife which is raised and lowered according to the pivoting of the second link and a second mechanism for moving a second connection point connecting the second arm and the first link along a second arc having a radius equal to the length of the second arm.
- the second connection point is a second pin attached to the second arm
- the second mechanism comprises a second oblong hole formed along the second arc in the first link so as to guide the second pin along the second arc and a second fixing mechanism for selectively fixing the second pin in a plurality of positions along the second oblong hole.
- Fig. 1 is an enlarged lateral view of a part of a link mechanism according to this invention.
- Fig. 2 is an enlarged vertical sectional view of a link and eccentric arm according to this invention.
- Fig. 3 is a schematic front view of a jacquard and a weaving machine to which this invention is applied.
- Fig. 4 is a lateral view of the link mechanism and a jacquard according to this invention.
- Fig. 5 is a front view of a knife, needle and hook for the purpose of describing thread selection by the jacquard.
- a thread selecting device operates in synchronism with the rotation of a main shaft 30 of a weaving machine.
- the rotation of the shaft 30 causes an eccentric arm 32 of the jacquard 2 shown in Fig. 4 to move up and down via a shaft 34.
- the up/down motion of the arm 32 is transmitted via a link pin 51, a first link 33, an arm 36 and a second link 35 to bars 37 and 38 so as to move the bars up and down together.
- a plurality of knives 7A are connected to the bars 37, 38 via a link member 39, these knives rising and falling together with the bars 37, 38.
- Another link mechanism of similar construction is provided in parallel with this link mechanism in order to raise and lower knives 7B.
- the difference of these link mechanisms is that the eccentric position of the eccentric arm is shifted by 180° with respect to each other so that the knives 7A, 7B rise and fall alternately due to the rotation of the shaft 34.
- the knives 7A, 7B respectively push up needles 4A, 4B as shown in Fig. 5.
- One thread 8 is connected to the two needles 4A, 4B via a pulley 52.
- a hook 6A engages with the needle 4A pushed up by the knife 7A according to the energization of a solenoid, and the needle 4A is thereby held in its raised position.
- both the needles are in their raised positions, so the thread 8 connected to the lower ends of the needles 4A, 4B is lifted up.
- an opening is formed in the thread 8, and a transverse thread is passed through the opening.
- desired threads 8 are selected so as to weave a desired pattern.
- the first link 33 is supported free to pivot about a point 53, the arm 32 being connected to the link 33 via the link pin 51.
- the arm 36 is connected via a link pin 61, the arm 36 being connected to the second link 35.
- the link pin 51 is supported free to rotate about the upper end of the arm 32, and passes through an arc-shaped oblong hole 60 formed in the first link 33.
- the center line of the hole 60 is set so that it coincides with the path of the radius R 1 of the arm 32 in the lowered position.
- a plurality of pairs of bolt holes 62 are formed around the hole 60.
- a flange 51A is formed an end of the link pin 51, the link pin 51 being fixed in any desired position along the hole 60 by bolts 55 which screw into bolt holes 62 through the flange 51A as shown in Fig. 2.
- the link pin 61 is supported free to rotate about one end of the arm 36, and passes through an arc-shaped oblong hole 66 formed in the first link 33.
- the center line of the hole 66 is set so that it coincides with the path of the radius R 2 of the arm 36 in the raised position of the knife 7A.
- a plurality of pairs of bolt holes 64 are formed around the hole 66.
- a flange 61A is formed at an end of the link pin 61, the link pin 61 being fixed in any desired position along the hole 66 by bolts 63 which screw into bolt holes 64 through the flange 61A as shown in Fig. 2.
- the bolt 55 When it is desired for example to increase the rising/falling distance of the knife 7A, the bolt 55 is removed, the link pin 51 is moved to the right of Fig. 1 along the hole 60, and is then again fixed to the link 33 by the bolt 55. The distance between the point 53 and the link pin 51 is then shorter, and the pivot angle of the first link 33 for the same up/down position of the arm 32, increases. The rising/falling distance of the knife 7A therefore increases.
- the stop position of the link pin 61 is moved in the same way. For example, when the stop position of the link pin 61 is moved toward the top of Fig. 1, the distance between the point 53 and link pin 61 increases, and the shift distance of the arm 36 for the same range of rotation of the first link 33, increases. The rotation range of the second link 35 therefore also increases, and the rising/falling distance of the knife 7A driven up and down via the link 35 increases.
- the rising/falling distances of the knife 7A driven by the first link 33 and of the knife 7A driven by the second link must be arranged to be identical.
- the rising/falling distance of the knife 7A driven by the first link 33 is therefore determined by setting the stop position of the link pin 51, and the stop position of the link pin 61 is determined such that the rising/falling distance of the knife 7A driven by the second link 35 is the same.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Looms (AREA)
Abstract
Description
- This invention relates to an improvement of a thread selecting device such as a jacquard used in a weaving machine.
- When a weaving machine forms a pattern, openings are for example formed in threads, and transverse threads are passed through the openings. To form openings, threads are held in raised positions, for which purpose a thread selecting device such as a jacquard which selects specific threads from a plurality of threads according to the pattern, and lifts them up, is installed above the weaving machine.
- The thread selecting device works in synchronism with the operating cycles of the weaving machine, for example via a link mechanism. The link mechanism raises a bar via an eccentric arm and an oscillating link connected to the arm. A plurality of knives connected to the bar individually lift needles connected to the threads.
- The raised needles are selectively held in their raised positions via hooks in response to solenoids. The threads are selected by selecting energizing solenoids.
- The openings in the threads vary depending on the weaving machine, and even for the same weaving machine, the required openings also vary according to thread type and stress setting for the threads used in a cloth. The thread openings correspond to the lifting distances of the needles, i.e. to the rising/falling distance of the knives.
- Each joint with the link arm may for example comprise an oblong hole and a link pin passing through the hole, this link pin being fixed by a bolt in one of a plurality of positions permitted by the oblong hole. When the fixing position is varied, the distance between the link pin and link pivot point varies, and the angular range through which the link pivots, varies. In this way, the rising/falling distance of the knife is varied.
- When the fixing position of the link pin is shifted, however, the link pivot angle varies for the same position of the eccentric arm. As a result the raised position of the knife, i.e. the lift position of the needle, also varies, however if the position of the hook does not change, it is difficult for the hook to attach the needle when the needle lift position largely varies.
- The needle lift position may be corrected by providing a length adjusting mechanism on the bar, however the correction must be performed each time the lift distance changes, and if such a mechanism is provided, the construction of the thread selecting device is rendered more complex.
- It is therefore an object of this invention to make it unnecessary to correct a needle lift position when the thread lift distance changes.
- It is a further object of this invention to vary a thread lift distance by a simple construction.
- In order to achieve the above objects, this invention provides a thread selecting device for a weaving machine. The device comprises a first arm moving up and down in synchronism with an action of the weaving machine, this arm having a length, a first link connected to the first arm at a first connection point and pivoting about a predetermined point according to the moving up and down of the first arm, and a knife which is raised and lowered according to the pivoting of the first link. Further provided is a first mechanism for moving the first connection point along a first arc having a radius equal to the length of the first arm.
- It is preferable that the first connection point is a first pin attached to the first arm, and the first mechanism comprises a first oblong hole formed along the first arc in the first link so as to guide the first pin along the first arc and a first fixing mechanism for selectively fixing the first pin in a plurality of positions along the first oblong hole.
- It is also preferable that the device further comprises a second link connected to the first link via a second arm, the second link pivoting about a predetermined point according to the pivoting of the first link, a knife which is raised and lowered according to the pivoting of the second link and a second mechanism for moving a second connection point connecting the second arm and the first link along a second arc having a radius equal to the length of the second arm.
- It is also preferable that the second connection point is a second pin attached to the second arm, and the second mechanism comprises a second oblong hole formed along the second arc in the first link so as to guide the second pin along the second arc and a second fixing mechanism for selectively fixing the second pin in a plurality of positions along the second oblong hole.
- The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.
- Fig. 1 is an enlarged lateral view of a part of a link mechanism according to this invention.
- Fig. 2 is an enlarged vertical sectional view of a link and eccentric arm according to this invention.
- Fig. 3 is a schematic front view of a jacquard and a weaving machine to which this invention is applied.
- Fig. 4 is a lateral view of the link mechanism and a jacquard according to this invention.
- Fig. 5 is a front view of a knife, needle and hook for the purpose of describing thread selection by the jacquard.
- Referring to Fig. 3 of the drawings, a thread selecting device operates in synchronism with the rotation of a
main shaft 30 of a weaving machine. The rotation of theshaft 30 causes aneccentric arm 32 of thejacquard 2 shown in Fig. 4 to move up and down via ashaft 34. - In the
jacquard 2, the up/down motion of thearm 32 is transmitted via alink pin 51, afirst link 33, anarm 36 and asecond link 35 tobars knives 7A are connected to thebars link member 39, these knives rising and falling together with thebars - Another link mechanism of similar construction is provided in parallel with this link mechanism in order to raise and lower
knives 7B. The difference of these link mechanisms is that the eccentric position of the eccentric arm is shifted by 180° with respect to each other so that theknives shaft 34. - The
knives needles thread 8 is connected to the twoneedles pulley 52. Ahook 6A engages with theneedle 4A pushed up by theknife 7A according to the energization of a solenoid, and theneedle 4A is thereby held in its raised position. When theother needle 4B is then pushed up by theknife 7B, both the needles are in their raised positions, so thethread 8 connected to the lower ends of theneedles thread 8 is lifted up, an opening is formed in thethread 8, and a transverse thread is passed through the opening. - However when a
solenoid 5 is not energized, ahook 40 does not engage with theneedle 4A, and theneedle 4A descends together with theknife 7A as it descends. In other words, when theneedle 4B rises, theneedle 4A descends instead and thethread 8 is not lifted. - Hence, by selectively energizing the
solenoids 5, desiredthreads 8 are selected so as to weave a desired pattern. - The above is a summary of the
jacquard 2 which applies this invention. - Next, the features of this invention will be described with reference to Fig. 1 and Fig. 2 of the drawings.
- The
first link 33 is supported free to pivot about apoint 53, thearm 32 being connected to thelink 33 via thelink pin 51. Thearm 36 is connected via alink pin 61, thearm 36 being connected to thesecond link 35. - The
link pin 51 is supported free to rotate about the upper end of thearm 32, and passes through an arc-shapedoblong hole 60 formed in thefirst link 33. The center line of thehole 60 is set so that it coincides with the path of the radius R1 of thearm 32 in the lowered position. A plurality of pairs ofbolt holes 62 are formed around thehole 60. A flange 51A is formed an end of thelink pin 51, thelink pin 51 being fixed in any desired position along thehole 60 bybolts 55 which screw intobolt holes 62 through the flange 51A as shown in Fig. 2. - The
link pin 61 is supported free to rotate about one end of thearm 36, and passes through an arc-shapedoblong hole 66 formed in thefirst link 33. The center line of thehole 66 is set so that it coincides with the path of the radius R2 of thearm 36 in the raised position of theknife 7A. A plurality of pairs ofbolt holes 64 are formed around thehole 66. Aflange 61A is formed at an end of thelink pin 61, thelink pin 61 being fixed in any desired position along thehole 66 bybolts 63 which screw intobolt holes 64 through theflange 61A as shown in Fig. 2. - In this thread selecting device, in the lowered position of the
arm 32, thefirst link 33 has rotated to its extreme anticlockwise position, the second link has rotated to its extreme clockwise position, and theknife 7A is in its raised position. - When it is desired for example to increase the rising/falling distance of the
knife 7A, thebolt 55 is removed, thelink pin 51 is moved to the right of Fig. 1 along thehole 60, and is then again fixed to thelink 33 by thebolt 55. The distance between thepoint 53 and thelink pin 51 is then shorter, and the pivot angle of thefirst link 33 for the same up/down position of thearm 32, increases. The rising/falling distance of theknife 7A therefore increases. - Even when the fixing position of the
link pin 51 varies, thelink pin 51 moves along an arc corresponding to the radius of thearm 32 in its lowered position. The rotation position of thelink 33 in the lowered position of thearm 32 therefore does not change, only the rotation position of thelink 33 in the raised position of thearm 32 moving in a clockwise direction. The raised position of theknife 7A does not vary, and the rising/falling distance of theknife 7A increases due to the downward shift of the lowered position of theknife 7A. Consequently, the positional relationship between theneedle 4A driven by theknife 7A and thehook 6A driven by thesolenoid 5 does not change, and only the lift distance of thethread 8 varies without any effect on the selecting of theneedle 4A by thehook 6A. - The stop position of the
link pin 61 is moved in the same way. For example, when the stop position of thelink pin 61 is moved toward the top of Fig. 1, the distance between thepoint 53 andlink pin 61 increases, and the shift distance of thearm 36 for the same range of rotation of thefirst link 33, increases. The rotation range of thesecond link 35 therefore also increases, and the rising/falling distance of theknife 7A driven up and down via thelink 35 increases. However, as the stop position of thelink pin 61 moves along an arc corresponding to the radius of thearm 36 in the raised position of theknife 7A, the rotation angle of thelink 35 in the raised position of theknife 7A does not change even when the stop position of thelink pin 61 changes, and the rising/falling distance of theknife 7A increases due to the downward movement of the lower position of theknife 7A. Consequently, the positional relationship between theneedle 4A driven by theknife 7A and thehook 6A driven by thesolenoid 5 does not change, and only the lift distance of thethread 8 varies without any effect on the selecting of theneedle 4A by thehook 6A. - In the aforesaid thread selecting device, the rising/falling distances of the
knife 7A driven by thefirst link 33 and of theknife 7A driven by the second link must be arranged to be identical. The rising/falling distance of theknife 7A driven by thefirst link 33 is therefore determined by setting the stop position of thelink pin 51, and the stop position of thelink pin 61 is determined such that the rising/falling distance of theknife 7A driven by thesecond link 35 is the same. - Accordingly, although this invention has been shown and described in terms of the preferred embodiments thereof, it is not to be considered as limited by any of the perhaps quite fortuitous details of the embodiments, or of the drawings, but only by the terms of the appended claims, which follow.
Claims (4)
- A thread selecting device (2) for a weaving machine (3), comprising a first arm (32) moving up and down in synchronism with an action of said weaving machine (3), said arm (32) having a length, a first link (33) connected to said first arm (32) at a first connection point (51) and pivoting about a predetermined point (53) according to the moving up and down of said first arm (32), and a knife (7A) which is raised and lowered according to the pivoting of said first link (33), characterized in that said device (2) further comprises:
first means (55, 60, 62) for moving said first connection point (51) along a first arc having a radius (R1) equal to the length of said first arm (32). - A thread selecting device (2) as defined in claim 1, wherein said first connection point (51) is a first pin (51) attached to said first arm (32), and said first means (55, 60, 62) comprises a first oblong hole (60) formed along said first arc in said first link (33) so as to guide said first pin (51) along said first arc and first fixing means (55, 62) for selectively fixing said first pin (51) in a plurality of positions along said first oblong hole (60).
- A thread selecting device (2) as defined in claim 1, further comprising a second link (35) connected to said first link (33) via a second arm (36), said second link (35) pivoting about a predetermined point according to the pivoting of said first link (33), a knife (7A) which is raised and lowered according to the pivoting of said second link (35) and second means (63, 64, 66) for moving a second connection point (61) connecting said second arm (36) and said first link (33) along a second arc having a radius (R2) equal to the length of said second arm (36).
- A thread selecting device (2) as defined in claim 3, wherein said second connection point (61) is a second pin (61) attached to said second arm (36), and said second means (63, 64, 66) comprises a second oblong hole (66) formed along said second arc in said first link (33) so as to guide said second pin (61) along said second arc and second fixing means (63, 64) for selectively fixing said second pin (61) in a plurality of positions along said second oblong hole (66).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10962595 | 1995-05-08 | ||
JP10962595A JPH08302536A (en) | 1995-05-08 | 1995-05-08 | Device for selecting warp |
JP109625/95 | 1995-05-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0742299A2 true EP0742299A2 (en) | 1996-11-13 |
EP0742299A3 EP0742299A3 (en) | 1998-01-07 |
EP0742299B1 EP0742299B1 (en) | 2002-09-04 |
Family
ID=14515037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960107117 Expired - Lifetime EP0742299B1 (en) | 1995-05-08 | 1996-05-06 | Thread selecting device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0742299B1 (en) |
JP (1) | JPH08302536A (en) |
DE (1) | DE69623383T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999005349A1 (en) * | 1997-07-23 | 1999-02-04 | Bonas Machine Company Limited | Drive mechanism for a griffe frame |
EP1710330A1 (en) * | 2005-04-08 | 2006-10-11 | NV Michel van de Wiele | Jacquard machine |
BE1024030B1 (en) * | 2016-04-08 | 2017-11-06 | Nv Michel Van De Wiele | JACQUARD WITH RENEWED DRIVE SYSTEM |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2428376A7 (en) * | 1978-03-30 | 1980-01-04 | Staubli Sa Ets | Lever mechanism for loom - disposed between dobby and heald frames to ensure easy control of loom drive transmission |
WO1994025654A1 (en) * | 1993-04-26 | 1994-11-10 | Textilma Ag | Shedding device for a weaving machine |
-
1995
- 1995-05-08 JP JP10962595A patent/JPH08302536A/en active Pending
-
1996
- 1996-05-06 EP EP19960107117 patent/EP0742299B1/en not_active Expired - Lifetime
- 1996-05-06 DE DE1996623383 patent/DE69623383T2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2428376A7 (en) * | 1978-03-30 | 1980-01-04 | Staubli Sa Ets | Lever mechanism for loom - disposed between dobby and heald frames to ensure easy control of loom drive transmission |
WO1994025654A1 (en) * | 1993-04-26 | 1994-11-10 | Textilma Ag | Shedding device for a weaving machine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999005349A1 (en) * | 1997-07-23 | 1999-02-04 | Bonas Machine Company Limited | Drive mechanism for a griffe frame |
EP1710330A1 (en) * | 2005-04-08 | 2006-10-11 | NV Michel van de Wiele | Jacquard machine |
BE1016486A4 (en) * | 2005-04-08 | 2006-12-05 | Wiele Michel Van De Nv | JACQUARD DEVICE. |
US7610939B2 (en) | 2005-04-08 | 2009-11-03 | N.V. Michel Van De Wiele | Jacquard machine |
CN1844524B (en) * | 2005-04-08 | 2010-11-03 | 米歇尔.范德威尔公司 | Jacquard machine |
BE1024030B1 (en) * | 2016-04-08 | 2017-11-06 | Nv Michel Van De Wiele | JACQUARD WITH RENEWED DRIVE SYSTEM |
Also Published As
Publication number | Publication date |
---|---|
DE69623383T2 (en) | 2003-01-09 |
EP0742299A3 (en) | 1998-01-07 |
JPH08302536A (en) | 1996-11-19 |
DE69623383D1 (en) | 2002-10-10 |
EP0742299B1 (en) | 2002-09-04 |
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