EP1182290A1 - Machine for lifting and cutting warp oriented sewing threads - Google Patents
Machine for lifting and cutting warp oriented sewing threads Download PDFInfo
- Publication number
- EP1182290A1 EP1182290A1 EP00830574A EP00830574A EP1182290A1 EP 1182290 A1 EP1182290 A1 EP 1182290A1 EP 00830574 A EP00830574 A EP 00830574A EP 00830574 A EP00830574 A EP 00830574A EP 1182290 A1 EP1182290 A1 EP 1182290A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wedge
- wedges
- arm
- cutting
- machine
- 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- Withdrawn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
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C13/00—Shearing, clipping or cropping surfaces of textile fabrics; Pile cutting; Trimming seamed edges
- D06C13/04—Shearing lace or embroidery, e.g. cutting loose threads
Definitions
- the present invention generally relates to machines for producing fabric webs and in particular to machines for cutting sew threads.
- weft oriented sew threads they can be cut easily by thread lifting wedges operatively oriented in opposition to the running direction of the fabric such to engage each thread, lift it over the upper edge of the respective wedge up to a blade position that cuts the thread.
- the thread lifting and cutting implements are wedge-shaped and provided with a blade over which the engaged thread eventually slide.
- a number (half) of transversally acting thread lifting wedges are oriented toward one side and the rest (the other half) of thread lifting and cutting wedges toward the opposite side such to "balance" the lateral thrust impressed to the running web.
- the blade edge must be regularly sharpened to ensure an effective cutting action on the threads.
- a progressive blunting of the edge increases the lateral thrust that is impressed to the fabric web.
- the machine for cutting warp oriented sew threads of the invention is characterized by the fact that on each transversally acting wedge is pivoted a circular blade that is rotated by a belt transmission driven by a motor installed on the transversal arm carrying the wedges.
- FIG. 1 A schematic lateral view of a machine of the invention 1 for cutting sew threads is depicted in Fig. 1.
- FIG. 3 A front view of the reciprocating wedges carrying arm 4 of the machine of the invention is depicted in Fig. 3, while details of the rotating blade thread cutting devices, according to a preferred embodiment, are highlighted in Fig. 2.
- the arm 4 has a plurality of thread lifting wedges 6.
- a half of wedges are oriented in a transversal direction and the other half in the opposite transversal direction, such that with the high frequency alternated motion of the arm 4, impressed through the crank 7 driven by a motor group 8, the fabric web running under the transversal arm 4 is subjected to lateral thrusts alternately in one and in the opposite direction because of the engagement of warp oriented sew threads by a first half of wedges and successively by the other half of wedges of the array thereof carried by the transversally reciprocating arm.
- a fundamental characteristic of the machine of the invention is that the cutting of the threads lifted by the wedges is produced by a circular blade 9 mounted on each thread lifting wedge 6 that is rotated through a belt or chain transmission.
- the driving motor 10 is mounted directly on the transversal arm 4. Of course, more than one motor and relative transmission may be used, respectively for portions of the total number of wedges.
- the transversal arm 4 is slidingly supported by a beam 11 of the machine, on ball-bearings or equivalent low friction devices 12a and 12b.
- the motor drive assembly that rotates the blades 10 is mounted on the reciprocating arm 4. Through speed reducing gears 13 and 14 an appropriate torque is transmitted by a chain 15 running on toothed wheels 16 and 17 to the rotating blade 9 of a first thread lifting wedge 6; usually, one of the two central wedges of the array of wedges 6 mounted along the lower edge of the reciprocating transversal arm 4.
- thin belts or chains 19 can be used, similar to the chain 15 that transmits the motion from the monitorized drive 10 to the axis of the rotating blade at least of a first wedge.
- the transmission of motion progressively from the circular blade of one or two first intermediate wedges to that all the other wedges mounted along the two branches of the arm 4 can be organized in different ways, by using a single recirculating belt, running on pulleys and/or rotating pivots present on each wedge, or more belts may be used, providing the wedges with double pulleys and/or with rotating pivots or redirecting pulleys, according to common transmission techniques.
- the rotating blades 9 may be realized such to "interfere" with the surface of the body of the thread lifting wedge to provide for a self sharpening action.
- the cutting action of the rotating blades far more effective than that of the fixed blades of the known machines retains its effectiveness for far longer periods than the fixed blades present on the upper edge of thread lifting wedges of known machines, thus avoiding the need of frequent substitutions of blades (or of wedges).
- each thread lifting wedge 6 can be customarily fixed to the arm 4 with screws, bolts or equivalent fastenings, one of which passing through a graduated adjustment slot to allow adjustment of the angle of incidence of the wedge out the surface of the running fabric web.
Abstract
A machine (1) for cutting warp oriented sew threads on an embroidered
fabric or on a fabric with sewn features, comprises means driving and
tensioning the running fabric web (2) to slide onto a transversal
channel-shaped support (3), a thread lifting and cutting wedges carrying
transversal arm (4) reciprocatingly moved at a high frequency, the arm
(4) having a plurality of thread lifting wedges (6) a certain number of
which oriented in a direction and the others in the opposite direction
along the reciprocating arm (4), the point of each wedge (6) pressing
with a certain angle of incidence on the surface of the running fabric
(2) in correspondence of the channel-shaped support (3) and each wedge
(6) having a blade (9) that cuts the threads engaged and lifted over the
upper edge thereof.
According to this invention, the machine (1) outstandingly reduces lateral thrusts impressed to the web (2) using a rotating circular blade (9) pivoted on the body of each wedge (6), each wedge (6) having at least a pulley (18) on the axle of the respective circular blade (9) engaged by a transmission belt or chain (19) and the reciprocating transversal arm (4) carries at least a motor drive assembly (10) transmitting the motion at least to a pulley (17) of a circular blade (9) of a first intermediate wedge of the plurality of wedges (6).
According to this invention, the machine (1) outstandingly reduces lateral thrusts impressed to the web (2) using a rotating circular blade (9) pivoted on the body of each wedge (6), each wedge (6) having at least a pulley (18) on the axle of the respective circular blade (9) engaged by a transmission belt or chain (19) and the reciprocating transversal arm (4) carries at least a motor drive assembly (10) transmitting the motion at least to a pulley (17) of a circular blade (9) of a first intermediate wedge of the plurality of wedges (6).
Description
- The present invention generally relates to machines for producing fabric webs and in particular to machines for cutting sew threads.
- In producing embroidered fabric webs or with similar features implying the realization of embroidery designs, buttonholes and/or sewings spaced along the fabric, there is the need of finishing operations including the cutting of sew threads between consecutively produced features on the fabric web such to interrupt continuity of the thread between the end of a sewing and the beginning of the successive sewing, and the subsequent rising and cropping of the lifted pieces of thread.
- In the case of weft oriented sew threads, they can be cut easily by thread lifting wedges operatively oriented in opposition to the running direction of the fabric such to engage each thread, lift it over the upper edge of the respective wedge up to a blade position that cuts the thread.
- By contrast, in the case of warp oriented sew threads, it is necessary to employ a dedicated machine for cutting the sew threads, a transversal arm carrying thread lifting and cutting wedges of which is moved in an alternative or reciprocating fashion at a relatively high frequency over the running fabric web.
- Also in this case, the thread lifting and cutting implements are wedge-shaped and provided with a blade over which the engaged thread eventually slide.
- In order to avoid inducing a lateral reciprocating thrust on the running fabric, a number (half) of transversally acting thread lifting wedges are oriented toward one side and the rest (the other half) of thread lifting and cutting wedges toward the opposite side such to "balance" the lateral thrust impressed to the running web.
- Notwithstanding this expedient, these known cutting devices wherein the upper inclined edge of each thread lifting wedge is provided with a sharpened blade portion over which the engaged thread eventually comes to slide ramping up from the tip of the wedge, induce nonnegligible lateral thrusts and stresses on the running fabric web even if oriented in opposite direction of engagement with the threads, and this may cause problems.
- Moreover, the blade edge must be regularly sharpened to ensure an effective cutting action on the threads. A progressive blunting of the edge increases the lateral thrust that is impressed to the fabric web.
- It has been found and is the object of the present invention an improved machine for cutting warp oriented sew threads that allows a sensible and stable reduction of the lateral thrusts impressed to the web and to ensure an effective cutting action of the sew threads for long periods, limiting the frequency of substitution of the lifting and cutting wedges mounted along the transversal arm of the device that is reciprocatingly moved at high frequency.
- The machine for cutting warp oriented sew threads of the invention is characterized by the fact that on each transversally acting wedge is pivoted a circular blade that is rotated by a belt transmission driven by a motor installed on the transversal arm carrying the wedges.
- The essential features of the machine of the invention are defined in
claim 1, and particularly effective embodiments are defined in the dependent claims. - The different aspects and advantages of the invention will be even more evident through the following description of an embodiment and by referring to the attached drawings, wherein:
- Figure 1 is a lateral view of a machine of the present invention for cutting warp oriented sew threads;
- Figure 2 is a detailed view of the sew threads cutting devices of the machine of the present invention;
- Figure 3 is a front view of the transversal wedges supporting arm of the machine of the present invention.
-
- A schematic lateral view of a machine of the
invention 1 for cutting sew threads is depicted in Fig. 1. In this schematic lateral view, the organs that ordinarily drive thefabric web 2 to pass over a transversal channel-shaped support 3 of the machine with an appropriate tension. In the upper portion of the machine there are organs for supporting a wedges carryingtransversal arm 4 in a position such that thread lifting wedges are pressed on the face of the running fabric web in correspondence of the channel of the transversal support 3 and for moving the arm transversally to the direction of the running fabric web in a high frequency reciprocating fashion. - A front view of the reciprocating
wedges carrying arm 4 of the machine of the invention is depicted in Fig. 3, while details of the rotating blade thread cutting devices, according to a preferred embodiment, are highlighted in Fig. 2. - Customarily, as can be observed in Fig. 3, the
arm 4 has a plurality ofthread lifting wedges 6. A half of wedges are oriented in a transversal direction and the other half in the opposite transversal direction, such that with the high frequency alternated motion of thearm 4, impressed through thecrank 7 driven by amotor group 8, the fabric web running under thetransversal arm 4 is subjected to lateral thrusts alternately in one and in the opposite direction because of the engagement of warp oriented sew threads by a first half of wedges and successively by the other half of wedges of the array thereof carried by the transversally reciprocating arm. - A fundamental characteristic of the machine of the invention is that the cutting of the threads lifted by the wedges is produced by a circular blade 9 mounted on each
thread lifting wedge 6 that is rotated through a belt or chain transmission. The drivingmotor 10 is mounted directly on thetransversal arm 4. Of course, more than one motor and relative transmission may be used, respectively for portions of the total number of wedges. - As observable in the detail view of Fig. 2, the
transversal arm 4 is slidingly supported by abeam 11 of the machine, on ball-bearings or equivalentlow friction devices - The motor drive assembly that rotates the
blades 10 is mounted on the reciprocatingarm 4. Throughspeed reducing gears chain 15 running ontoothed wheels thread lifting wedge 6; usually, one of the two central wedges of the array ofwedges 6 mounted along the lower edge of the reciprocatingtransversal arm 4. - On the same rotating axis of the
wheel 17 of the rotating blade 9 of thewedge 6, is mounted at least a pulley orgear 18 through which rotation impressed to the blade of the first wedge is transmitted to all the other pulleys orgears 18 of the rotating blade 9 of allother wedges 6 of the array. - To transmit rotation to the circular blades pivoted on the respective thread lifting wedges, thin belts or
chains 19 can be used, similar to thechain 15 that transmits the motion from the monitorizeddrive 10 to the axis of the rotating blade at least of a first wedge. - Of course, the transmission of motion progressively from the circular blade of one or two first intermediate wedges to that all the other wedges mounted along the two branches of the
arm 4 can be organized in different ways, by using a single recirculating belt, running on pulleys and/or rotating pivots present on each wedge, or more belts may be used, providing the wedges with double pulleys and/or with rotating pivots or redirecting pulleys, according to common transmission techniques. - The rotating blades 9 may be realized such to "interfere" with the surface of the body of the thread lifting wedge to provide for a self sharpening action.
- In any case, the cutting action of the rotating blades far more effective than that of the fixed blades of the known machines, retains its effectiveness for far longer periods than the fixed blades present on the upper edge of thread lifting wedges of known machines, thus avoiding the need of frequent substitutions of blades (or of wedges).
- The body of each
thread lifting wedge 6 can be customarily fixed to thearm 4 with screws, bolts or equivalent fastenings, one of which passing through a graduated adjustment slot to allow adjustment of the angle of incidence of the wedge out the surface of the running fabric web. - Normally, in order to effectively engage and lift sew threads between end points and start points of successive sewings relatively close to each other (up to 0,5 cm distance of separation between one thread and another) it is necessary to orient the wedges with a relatively accentuated angle of incidence while in case of threads more spaced from one another the angle of incidence may be reduced.
- It is also possible to pivot the wedges on the
arm 4 and engage a second pin in an appendix of thearm 4 that can be shifted in an adjustable manner, in order to adjust the angle of incidence of all (or of a first half and separately of the other half) the wedges of the array with a single adjustment operation by modifying the relative position of the appendix in respect to thearm 4.
Claims (4)
- A machine for cutting warp oriented sew threads on an embroidered fabric or on a fabric with sewing features, comprising means driving and tensioning a running fabric web to slide onto a transversal channel-shaped support a thread lifting and cutting wedges carrying transversal arm reciprocatingly moved at a high frequency, said arm having a plurality of thread lifting wedges a certain number of which oriented in a direction and the others in the opposite direction along the longitudinal axis of said reciprocating arm, the point of each wedge pressing with a certain angle of incidence on the surface of the running fabric in correspondence of said channel-shaped support and each wedge having a blade cutting the threads engaged and lifted along the upper edge thereof, characterized in thatsaid blade is a rotating circular blade pivoted on the body of each wedge;each wedge having at least a pulley on the axle of the respective circular blade engaged by a transmission belt or chain;said arm carrying at least a motor drive assembly transmitting the motion at least to a pulley of a circular blade of a first intermediate wedge of said plurality of wedges.
- The machine for cutting warp oriented sew threads of claim 1, characterized in that said circular rotating blade is disk-shaped.
- The machine for cutting warp oriented sew threads of claim 1, wherein several transmission belts or chains transmit the rotating motion to pulleys of respective circular blades of the wedges uniformly distributed along an edge of said reciprocating transversal arm.
- The machine for cutting warp oriented sew threads, of claim 1, wherein the angle of incidence of each wedge onto the running fabric web is adjustable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00830574A EP1182290A1 (en) | 2000-08-10 | 2000-08-10 | Machine for lifting and cutting warp oriented sewing threads |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00830574A EP1182290A1 (en) | 2000-08-10 | 2000-08-10 | Machine for lifting and cutting warp oriented sewing threads |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1182290A1 true EP1182290A1 (en) | 2002-02-27 |
Family
ID=8175453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00830574A Withdrawn EP1182290A1 (en) | 2000-08-10 | 2000-08-10 | Machine for lifting and cutting warp oriented sewing threads |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1182290A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005056904A1 (en) * | 2003-12-12 | 2005-06-23 | Alessandro Beccati | Fabric weave and warp yarn cutting machine |
WO2017216817A1 (en) * | 2016-06-15 | 2017-12-21 | Visentin, Liliana | Improved shearing machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2444079A (en) * | 1946-03-14 | 1948-06-29 | Sr Theodore Weber | Thread severing apparatus |
CH419036A (en) * | 1963-08-19 | 1966-08-31 | Internationaler Forschungs Tru | Device for cutting threads at tips |
US3390603A (en) * | 1967-02-20 | 1968-07-02 | Graichen Claus | Floater thread clipping apparatus |
-
2000
- 2000-08-10 EP EP00830574A patent/EP1182290A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2444079A (en) * | 1946-03-14 | 1948-06-29 | Sr Theodore Weber | Thread severing apparatus |
CH419036A (en) * | 1963-08-19 | 1966-08-31 | Internationaler Forschungs Tru | Device for cutting threads at tips |
US3390603A (en) * | 1967-02-20 | 1968-07-02 | Graichen Claus | Floater thread clipping apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005056904A1 (en) * | 2003-12-12 | 2005-06-23 | Alessandro Beccati | Fabric weave and warp yarn cutting machine |
WO2017216817A1 (en) * | 2016-06-15 | 2017-12-21 | Visentin, Liliana | Improved shearing machine |
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