EP1559821A1 - Improved circular knitting machine - Google Patents
Improved circular knitting machine Download PDFInfo
- Publication number
- EP1559821A1 EP1559821A1 EP04001386A EP04001386A EP1559821A1 EP 1559821 A1 EP1559821 A1 EP 1559821A1 EP 04001386 A EP04001386 A EP 04001386A EP 04001386 A EP04001386 A EP 04001386A EP 1559821 A1 EP1559821 A1 EP 1559821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sinker
- drum
- cam
- sinkers
- contact
- 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- Withdrawn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
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/06—Sinkers
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/32—Cam systems or assemblies for operating knitting instruments
- D04B15/327—Cam systems or assemblies for operating knitting instruments for stitch-length regulation
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/32—Cam systems or assemblies for operating knitting instruments
- D04B15/34—Cam systems or assemblies for operating knitting instruments for dials
Definitions
- the present invention relates to an improved circular knitting machine that has a saddle plate with matching cams and sinkers assembled thereon in an inclined manner, and a sinker drum with a concave surface forming a continuous circular ring in the shape of a conical shallow tray to allow the cams and the sinker drum to form a concave and convex surface contact thereby to achieve a smooth match between sinkers and cams.
- Conventional circular knitting machines generally include sinkers driven by a cam.
- the cam has a driving path to move the sinkers to and fro to perform a knitting operation.
- the sinker is engaged with a preset driving path as shown in FIG. 1A.
- the lug 62 of the sinker 61 is engaged with the driving path 64 of the cam 63 so that the sinker 61 is moved according to the driving path 64 to perform the knitting operation.
- the cam 63 is mounted horizontally on the machine deck.
- the sinker 61 is also mounted horizontally.
- the sinker 61 is located on a sinker drum 60 which rotates at a high speed during knitting operation, and the sinker 61 is driven by the driving path 64 to move reciprocally to and fro rapidly.
- the sinker drum 60 rotates at high speed
- the sinker 61 is forced outwards due to a centrifugal force, but is retained by the driving path 64 of the cam 63.
- the lug 62 moves along the driving path 64.
- the centrifugal force generates a great force on the sinker 61 (indicated by an arrow in FIG. 2).
- the contact surface 66 and contact angle 67 between the driving path 64 and the lug 62 form many stress concentration points.
- the continuous centrifugal force creates severe friction and wear. As a result, the lifetime of the sinker 61 and the cam 63 significantly decreases.
- the cam 63 is mounted horizontally on the machine deck and the sinker 61 also is mounted horizontally.
- the sinker drum 60 is a circular barrel with a plurality of cams 63 mounted thereon adjacent to one another in an annular fashion.
- interference or interruption can occur with the to and fro reciprocal movements of the sinker 61.
- the object of the invention is to provide an improved circular knitting machine that has a saddle plate with inclined holding surfaces and a sinker drum with an inclined surface so that the matching cams and sinkers are also coupled in an inclined manner.
- the cams and the sinker drum form a concave and convex arched contact surface so that a gap is less likely to occur.
- the sinker may be moved along the driving path more smoothly without interference or interruption.
- the driving path provided in the invention can also reduce the centrifugal force of the sinker and prevent the lug from hitting the cam. Therefore, the service life of the sinker and cam may increase.
- the improved circular knitting machine according to the invention includes:
- the contact section 25 that has the driving path 21 formed thereon has a fine convex surface 23 in contact with the concave surface 52 of the conical shallow tray of the sinker drum 50 (referring to FIGS. 6 and 8) so that the convex surface 23 and the concave surface 52 form a close concave and convex contact therefore the gap between every two neighboring cams 20 may be minimized or eliminated.
- interference or interruption on the sinker 40 may be minimized for a smooth operation.
- the sinker 40 has a lug 41 on one end that can slide along the driving path 21 of the cam 20, and the other end wedged in the sinker trough 51 of the sinker drum 50.
- the sinker 40 is movable because of the lug 41 driven by the driving path 21. As the cam 20 is inclined, the sinker 40 also is inclined at an angle.
- the saddle plate 10 and the sinker drum 50 are installed in an inclined manner.
- the cam 20 and the sinker 40 also are mounted thereon in an inclined manner. This is the main feature of the invention to achieve the desired results (referring to FIGS. 9 and 10).
- the sinker 40 When the sinker drum 50 rotates at high speed, the sinker 40 generates a centrifugal force F (indicated by an arrow in the drawings).
- the centrifugal force F applied on the sinker 40 at comprising a horizontal centrifugal component force F1 and a vertical centrifugal component force F2 formed on the inclined surface.
- the sinker 40 has a gravity force W which also effects a horizontal gravity component force W1 and a vertical gravity component force W2 on the inclined surface.
- the horizontal gravity component force W1 is opposite to the horizontal centrifugal component force F1 and thus can offset a portion of the horizontal centrifugal component force F1.
- the impact force of the lug 41 on the driving path 21 resulting from the centrifugal force F may be reduced. This not only makes moving the lug 41 in the driving path 21 smoother but increases the service life of the sinker 40 and cam 20.
Abstract
Description
- The present invention relates to an improved circular knitting machine that has a saddle plate with matching cams and sinkers assembled thereon in an inclined manner, and a sinker drum with a concave surface forming a continuous circular ring in the shape of a conical shallow tray to allow the cams and the sinker drum to form a concave and convex surface contact thereby to achieve a smooth match between sinkers and cams.
- Conventional circular knitting machines generally include sinkers driven by a cam. The cam has a driving path to move the sinkers to and fro to perform a knitting operation.
- The sinker is engaged with a preset driving path as shown in FIG. 1A. During a knitting operation, the
lug 62 of thesinker 61 is engaged with thedriving path 64 of thecam 63 so that thesinker 61 is moved according to thedriving path 64 to perform the knitting operation. Thecam 63 is mounted horizontally on the machine deck. Thesinker 61 is also mounted horizontally. - Referring to FIGS. 1A and 2, the
sinker 61 is located on asinker drum 60 which rotates at a high speed during knitting operation, and thesinker 61 is driven by thedriving path 64 to move reciprocally to and fro rapidly. When thesinker drum 60 rotates at high speed, thesinker 61 is forced outwards due to a centrifugal force, but is retained by thedriving path 64 of thecam 63. Meanwhile thelug 62 moves along thedriving path 64. The centrifugal force generates a great force on the sinker 61 (indicated by an arrow in FIG. 2). As a result, thelug 62 does not move as smoothly as desired along thedriving path 64. Thecontact surface 66 andcontact angle 67 between thedriving path 64 and thelug 62 form many stress concentration points. The continuous centrifugal force creates severe friction and wear. As a result, the lifetime of thesinker 61 and thecam 63 significantly decreases. - Moreover, as shown in FIG. 1B the
cam 63 is mounted horizontally on the machine deck and thesinker 61 also is mounted horizontally. But thesinker drum 60 is a circular barrel with a plurality ofcams 63 mounted thereon adjacent to one another in an annular fashion. There is agap 65 formed between two neighboring andhorizontal cams 63. This resulting connection is not continuous betweencams 63. Hence during high speed rotation, interference or interruption can occur with the to and fro reciprocal movements of thesinker 61. - Therefore the object of the invention is to provide an improved circular knitting machine that has a saddle plate with inclined holding surfaces and a sinker drum with an inclined surface so that the matching cams and sinkers are also coupled in an inclined manner. The cams and the sinker drum form a concave and convex arched contact surface so that a gap is less likely to occur. As a result, when the sinker drum rotates, the sinker may be moved along the driving path more smoothly without interference or interruption.
- The driving path provided in the invention can also reduce the centrifugal force of the sinker and prevent the lug from hitting the cam. Therefore, the service life of the sinker and cam may increase.
- The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
-
- FIG. 1A is a perspective view of conventional cams and sinkers mounted in a horizontal manner.
- FIG. 1B is a fragmentary enlarged schematic view according to FIG. 1A.
- FIG. 2 is a schematic view of a conventional cam and sinker in a coupled condition.
- FIG. 3A is a perspective view of the invention.
- FIG. 3B is a fragmentary enlarged schematic view according to FIG.3A.
- FIG. 4 is a perspective view of a cam and a sinker of the invention in a coupled condition.
- FIG. 5 is a perspective view of the cam and the sinker according to FIG. 4 in an inverse condition.
- FIG. 6 is a side view of a sinker of the invention.
- FIG. 7 is a cross section taken on line 7-7 in FIG. 6.
- FIG. 8 is a cross section taken on line 8-8 in FIG. 6.
- FIG. 9 is a side view of the invention showing the cam mounted in an inclined manner
- FIG. 10 is a schematic view of force analysis of the sinker of the invention when subject to a dynamic force.
-
- Please referring to FIG. 3A, the improved circular knitting machine according to the invention includes:
- a
sinker drum 50 located on an inner ring of the annular knitting section of a knitting machine. It is formed in the shape of a conical shallow tray with an inner surface formed in a small concave surface 52 (the concave surface is formed in a fined fashion and recognizable only by viewing the entire annular ring). The perimeter of thesinker drum 50 hassinker troughs 51 formed thereon in an equally spaced manner for holdingsinkers 40 therein. Thesinker drum 40 rotates at high speed during knitting operation; - a saddle plate 10 (referring to FIG. 3B) which is formed in
an inclined manner and supported by a plurality of
bracing brackets 11 on the outer perimeter for mounting securely on the machine deck of the circular knitting machine. Thesaddle plate 10 has an inner perimeter forming a plurality ofholding surfaces 12 in an equally spaced manner. Each of theholding surfaces 12 is formed in an inclined manner and forms an included angle with the horizontal surface so that theentire saddle plate 10 also is inclined. Theholding surface 12 has ascrew hole 122 which is also formed in an inclined manner and the inclination is alterable according to the change of the included angle; - a cam 20 (referring to FIGS. 4 and 5) which has a
fastening section 24 on one end and acontact section 25 on another end. Thefastening section 24 is fastened to theholding section 12 in an inclined manner through thescrew hole 122. There is an adjusting means 30 located on a lower side of thefastening section 24 to adjust the position of thecam 20. Thecontact section 25 has an irregular and curved drivingpath 21 formed on a lower side (depending on installation condition). Thecam 20 is installed on each holdingsurface 12 of thesaddle plate 10 and forms a circular array with other cams along thesaddle plate 10. Thefastening section 24 has acontact plane 22 in contact with the holding surface 12 (referring to FIGS. 6 and 7). -
- The
contact section 25 that has the drivingpath 21 formed thereon has a fineconvex surface 23 in contact with theconcave surface 52 of the conical shallow tray of the sinker drum 50 (referring to FIGS. 6 and 8) so that theconvex surface 23 and theconcave surface 52 form a close concave and convex contact therefore the gap between every two neighboringcams 20 may be minimized or eliminated. Thereby when thesinker drum 50 rotates and thesinker 40 is moved in the drivingpath 21, interference or interruption on thesinker 40 may be minimized for a smooth operation. - The
sinker 40 has alug 41 on one end that can slide along the drivingpath 21 of thecam 20, and the other end wedged in thesinker trough 51 of thesinker drum 50. Thesinker 40 is movable because of thelug 41 driven by the drivingpath 21. As thecam 20 is inclined, thesinker 40 also is inclined at an angle. - As previously discussed, the
saddle plate 10 and thesinker drum 50 are installed in an inclined manner. Thecam 20 and thesinker 40 also are mounted thereon in an inclined manner. This is the main feature of the invention to achieve the desired results (referring to FIGS. 9 and 10). - When the
sinker drum 50 rotates at high speed, thesinker 40 generates a centrifugal force F (indicated by an arrow in the drawings). As the centrifugal force F applied on thesinker 40 at comprising a horizontal centrifugal component force F1 and a vertical centrifugal component force F2 formed on the inclined surface. Thesinker 40 has a gravity force W which also effects a horizontal gravity component force W1 and a vertical gravity component force W2 on the inclined surface. The horizontal gravity component force W1 is opposite to the horizontal centrifugal component force F1 and thus can offset a portion of the horizontal centrifugal component force F1. As a result, the impact force of thelug 41 on the drivingpath 21 resulting from the centrifugal force F may be reduced. This not only makes moving thelug 41 in the drivingpath 21 smoother but increases the service life of thesinker 40 andcam 20. - While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
Claims (2)
- An improved circular knitting machine for reducing wear to sinkers and cams from centrifugal force, comprising:a saddle plate having a first inclined surface which has a plurality of holding surfaces formed thereon;a sinker drum surrounded by the saddle plate having a second inclined surface which has a plurality of sinker troughs formed thereon, the second inclined surface being formed in an annular ring and shaped like a conical shallow tray so that the sinker drum forms a concave surface;a plurality of sinkers housed in the sinker troughs in an inclined manner; anda plurality of cams each having a fastening section on one end and a contact section on the other end, the contact end having a convex surface in contact with the concave surface of the sinker drum, the contact section having a driving path formed on the bottom side thereof to allow the sinkers to move.
- The improved circular knitting machine of claim 1, wherein the fastening section of the cam is in contact with the holding surface on a plane.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04001386A EP1559821A1 (en) | 2004-01-22 | 2004-01-22 | Improved circular knitting machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04001386A EP1559821A1 (en) | 2004-01-22 | 2004-01-22 | Improved circular knitting machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1559821A1 true EP1559821A1 (en) | 2005-08-03 |
Family
ID=34639370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04001386A Withdrawn EP1559821A1 (en) | 2004-01-22 | 2004-01-22 | Improved circular knitting machine |
Country Status (1)
Country | Link |
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EP (1) | EP1559821A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102877206A (en) * | 2012-10-16 | 2013-01-16 | 无锡市佳龙纺织机械有限公司 | Sinker structure for circular knitting machine |
CN105624904A (en) * | 2016-04-07 | 2016-06-01 | 福建泉州凹凸精密机械有限公司 | Triangular mounting structure of circular knitting machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2639659A1 (en) * | 1988-11-29 | 1990-06-01 | Lu Sa Ho | Knitting method |
EP0402034A1 (en) * | 1989-05-31 | 1990-12-12 | Precision Fukuhara Works, Ltd | Double-knit circular knitting machine |
EP0478855A1 (en) * | 1990-10-04 | 1992-04-08 | Precision Fukuhara Works, Ltd | Method of knitting fabric and circular knitting machine for this use |
-
2004
- 2004-01-22 EP EP04001386A patent/EP1559821A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2639659A1 (en) * | 1988-11-29 | 1990-06-01 | Lu Sa Ho | Knitting method |
EP0402034A1 (en) * | 1989-05-31 | 1990-12-12 | Precision Fukuhara Works, Ltd | Double-knit circular knitting machine |
EP0478855A1 (en) * | 1990-10-04 | 1992-04-08 | Precision Fukuhara Works, Ltd | Method of knitting fabric and circular knitting machine for this use |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102877206A (en) * | 2012-10-16 | 2013-01-16 | 无锡市佳龙纺织机械有限公司 | Sinker structure for circular knitting machine |
CN105624904A (en) * | 2016-04-07 | 2016-06-01 | 福建泉州凹凸精密机械有限公司 | Triangular mounting structure of circular knitting machine |
CN105624904B (en) * | 2016-04-07 | 2017-05-24 | 福建泉州凹凸精密机械有限公司 | Triangular mounting structure of circular knitting machine |
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