EP3599305A1 - Improved looping machine and related method - Google Patents
Improved looping machine and related method Download PDFInfo
- Publication number
- EP3599305A1 EP3599305A1 EP19164181.0A EP19164181A EP3599305A1 EP 3599305 A1 EP3599305 A1 EP 3599305A1 EP 19164181 A EP19164181 A EP 19164181A EP 3599305 A1 EP3599305 A1 EP 3599305A1
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- European Patent Office
- Prior art keywords
- fabric
- needle
- looping
- machine
- segments
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- 238000000034 method Methods 0.000 title claims description 14
- 239000004744 fabric Substances 0.000 claims abstract description 71
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 230000007717 exclusion Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims 1
- 238000005304 joining Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000003464 asthenopia Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B7/00—Linking machines, e.g. for joining knitted fabrics
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
- D05B19/04—Sewing machines having electronic memory or microprocessor control unit characterised by memory aspects
- D05B19/08—Arrangements for inputting stitch or pattern data to memory ; Editing stitch or pattern data
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B79/00—Incorporations or adaptations of lighting equipment
Definitions
- the present invention relates to an improved looping machine and a related looping method.
- looping is a processing technique used in the textile field which consists in joining together two pieces of fabric. For example, it is used to join collars, cuffs and sleeves to the rest of the garment, to thus be able to make the finished product.
- the joining of the flaps is performed by picking stitch by stitch both ends of the fabrics.
- the joining thread is "knitted" between the terminal rank of the two flaps, thus obtaining the continuity of the stitch.
- the joining made in this way is very flat and actually imperceptible.
- Figure 1 shows a traditional looping machine. It is a circular machine where the operator must insert the stitches at the ends of the two fabrics into the tips. Thereafter, the machine makes the looping points at the pre-positioned stitches.
- the algorithm of these known looping machines represents a major limitation in that it calculates an average between the distances of the holes where the needle must sew the seam, and then controls the motors/actuators to move the needle with a fixed pitch along the seam line.
- This solution is not very functional as the distance between the stitches is highly variable in a fabric.
- one of the main causes of variation in the distance between the holes is the intensity with which the fabric is held during its progress. With this choice of control, the loss of the correct sewing pitch is obtained at any sewing speed, causing several errors.
- reference numeral 4 globally indicates an overall schematic view of a looping machine according to the present invention.
- the looping machine 4 comprises a fixed unit comprising a support frame 8 and a mobile unit 100, supported by said fixed unit, so as to be able to move and appropriately actuate a needle 10 for the looping operation on fabric 12.
- the mobile unit 100 comprises a feed device 16 of the fabric 12 along a longitudinal direction or axis Y-Y, a positioning device 20 of the needle 10 along a transverse direction or axis X-X, perpendicular to said longitudinal direction or axis Y-Y and coplanar with the fabric 12, and an actuation device 24 of said needle 10 along a vertical direction or axis Z-Z, perpendicular to said longitudinal Y-Y and transverse X-X directions, to perform the looping.
- the feed device 16 of the fabric 12 comprises blocking means 28 of the fabric 12, configured to keep the fabric 12 pressed on the feed device 16 of the fabric 12.
- said blocking means 28 of the fabric 12 comprise an articulated foot 36 with two rotations capable of uniformly pressing the fabric 12, even in the presence of non-uniform thicknesses of the fabric.
- said blocking means 28 are adjustable so as to adjust the foot pressure 36 on said fabric 12.
- the feed device 16 of the fabric or fabric 12 comprises an electric motor 30.
- the positioning device 20 of the needle 10 comprises an electric motor 30 connected to a roller screw or recirculating ball screw 101, in turn connected to a mobile unit 100 which performs the linear translation of the needle along the transverse direction X-X.
- the actuation device 24 of the needle 10 comprises an electric motor 30 connected to the needle 10 with a connecting rod-crank mechanism for performing the alternate stitching movement of the needle 10.
- the needle 10 passes through a particular plate 38 with a hole 39 for the needle 10 which limits its deformation and ensures a better seam.
- the fabric 12 is preventively provided with a guide thread 40 inserted inside the fabric 12 so as to identify a plurality of segments 44 (blob).
- the guide thread 40 is preferably made of a phosphorescent material, so as to be easily identified by a suitable optical system or camera 103.
- the looping machine 4 is provided with an ultraviolet light lighting system with neon 52, to highlight said phosphorescent guide thread 40 48.
- said ultraviolet light, lighting system 52 is fitted at the blocking means 28 of the fabric 12.
- said guide thread 40 is made of a watersoluble material, so that it can be dissolved in the subsequent washing of the fabric, without having to proceed with its manual removal.
- the looping machine 4 comprises a camera 103 suitable for identifying the guide thread 40.
- the looping machine 4 is further provided with a processing and control unit 56, operatively connected to the camera 103 and to actuators/electric motor means of the feed device 16 of the fabric 12, of the positioning device 20 of the needle 10 and of the actuation device 24 of the needle 10.
- the processing and control unit 56 is able to determine in real-time the target position of the needle 10 depending on the guide thread 40 and to control in real-time the feed devices 16 of the fabric 12, positioning devices 20 of the needle 10 and actuation devices 24 of the needle 10 to reach said target stitching position of the needle 10.
- the feed device 16 of the fabric 12 and/or the positioning device 20 of the needle 10 and/or the actuation device 24 of the needle 10 comprise respective electric motors 30 with real-time feedback by means of said processing and control unit 56, depending on the target stitching position of the needle 10.
- At least one of the feed device 16 of the fabric 12, the positioning device 20 of the needle 10 and the actuation device 24 of the needle 10 comprises respective real-time feedback electric motors 30; preferably at least two of said devices 16, 20, 24 comprise respective real-time feedback electric motors 30 and, even more preferably, all the devices 16, 20, 24 comprise respective real-time feedback electric motors 30.
- the processing and control unit 56 is programmed so that said electric motors 30 are controlled at a variable pitch in real-time depending on the target stitching position of the needle 10.
- the looping machine according to the present invention is able to perform the looping operation in a particularly efficient manner.
- the looping method of a fabric 12 comprises the steps of:
- the step of carrying out the stitching provides for the calculation, in real-time, of the target stitching position of the needle 10 depending on the guide thread 40, the real-time actuation of the feed devices 16 of the fabric 12, the positioning devices 20 of the needle 10 and actuation devices 24 of the needle 10 to reach said target stitching position of the needle 10.
- the exclusion step of the secondary centroids 68 comprises the step of eliminating secondary centroids 68 positioned on the left, with respect to the transverse direction X-X, and at a same height, along the vertical direction Z-Z, of the primary centroids 104 of the segments (blob) 44 of the guide thread 40.
- the looping method also provides for the step of eliminating the segments (blob) 44 having a smaller area with respect to a predetermined threshold value.
- the longitudinal coordinate of the stitching point corresponds to the mean of the longitudinal coordinates of the centroids 104 of the guide thread 40 and the transverse coordinate of the stitching point lies along said interpolation line.
- the present invention allows overcoming the drawbacks of the prior art.
- the looping machine of the present invention is an automatic machine completely innovative in the way it operates with respect to a known manual looping machine.
- this machine due to a special vision system, is able to independently identify the stitches, to calculate in real-time the looping step to be made and then to position the needle at these points following the indications of a particular control algorithm.
- the needle can move in all directions on the fabric going to center the stitch that the camera captures in real time.
- the solution of the present invention allows the looping operation to be modernized, solving the limits of the current technology, increasing productivity, improving the quality of the processed fabrics, reducing the costs of processing and improving the working conditions of the workers involved in the looping.
- the looping machine can be used by an untrained operator who simply has to position the fabric at the base of the needle and operate the looping machine with a command.
- the ease of use therefore makes the training time of personnel almost non-existent.
- the looping machine of the present invention is flexible; it does not require any changes to the setup to change the fineness of the fabric as it automatically calculates the pitch, between one stitch and the other, in real-time mode.
- the processing speed is far higher than a manual looping machine; you can easily exceed a speed of 700 points per minute.
- the quality of the work no longer depends on a person, but is guaranteed by the reliability of a computer.
- the looping operation is much less expensive and simpler to execute, at the same time increasing productivity and reducing processing times.
- the motors are no longer controlled with a fixed pitch, as in the known automatic solutions, but receive real-time instructions on which the next movement to be performed by a feedback control must be.
- the mechanics is simplified so as to overcome all the speed limits caused by the technical choices of the known automatic solutions, so as to achieve and exceed even 700 PPM and beyond.
- the needle can move in all directions on the fabric going to center the stitch that the camera captures in real time.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Sewing Machines And Sewing (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
- The present invention relates to an improved looping machine and a related looping method.
- As is known, looping is a processing technique used in the textile field which consists in joining together two pieces of fabric. For example, it is used to join collars, cuffs and sleeves to the rest of the garment, to thus be able to make the finished product. The joining of the flaps is performed by picking stitch by stitch both ends of the fabrics. The joining thread is "knitted" between the terminal rank of the two flaps, thus obtaining the continuity of the stitch. The joining made in this way is very flat and actually imperceptible.
- The looping operation appears to be a process with major limitations:
- it is slow and expensive; in this regard, it is estimated that it takes more than 70% of a garment's production time;
- the current looping machine is not flexible, in fact when the fabric fineness changes it requires a different setup and therefore a setup time that limits its productivity;
- the looping operator needs great experience and skills to be able to reduce errors to a minimum and acquire a certain speed, skills he/she acquires after several months of practice,
- one of the main problems encountered by those working in this sector is excessive eyestrain due to the ways in which the looping is performed; such strain, if prolonged over time, can lead to a progressive reduction in the operator's vision.
- For these reasons, providing a looping machine capable of identifying autonomously where to make the stitches, besides being an advantage in terms of speed, costs and accuracy of execution, improves the working conditions of those who use the machine, making the task less heavy and preventing workplace accidents.
-
Figure 1 shows a traditional looping machine. It is a circular machine where the operator must insert the stitches at the ends of the two fabrics into the tips. Thereafter, the machine makes the looping points at the pre-positioned stitches. - There are also examples in the art of looping machines of the automatic or semi-automatic type which aim to solve at least partially the aforementioned problems of the manual type machine.
- However, these machines are not free from problems that prevent or limit the correct functioning thereof.
- For example, the algorithm of these known looping machines represents a major limitation in that it calculates an average between the distances of the holes where the needle must sew the seam, and then controls the motors/actuators to move the needle with a fixed pitch along the seam line. This solution is not very functional as the distance between the stitches is highly variable in a fabric. For example, one of the main causes of variation in the distance between the holes is the intensity with which the fabric is held during its progress. With this choice of control, the loss of the correct sewing pitch is obtained at any sewing speed, causing several errors.
- Moreover, the mechanics of the known machine has great limitations in the choice of the components which limit its maximum speed up to a maximum of 400 stitches per minute. These limits are due, for example, to the following factors:
- the use of motors that are not very versatile in terms of the number and type of parameters that can be modified to perform the movement. In particular, it is not possible to change the gains of the PID controllers. Furthermore, it is not possible to assign the position, speed and acceleration profiles adopted by the motors as desired. As far as diagnostics is concerned, it is not possible to monitor which the position references are and the actual positions that the motors assume during a movement: this limit is the cause of further inaccuracies in the stitching points;
- the only parameters that can be modified are the maximum acceleration and speed that are used for making the trajectories. The lack of versatility of these motors in trajectory planning is to be considered one of the most critical points for achieving a highly performing automation;
- there is also the problem of an excessive elasticity and backlash of the transmission system connected to the motor responsible for the advancement of the fabric. The movement of the fabric must take place in a very short time (about 20ms), the presence of elasticity (for example due to the belts used) causes a delay in the movement of the fabric with respect to the movement of the motor, avoidable by limiting the acceleration of the motor and therefore the movement time of the fabric. This limits the maximum speed of the entire looping operation;
- the high inertia of the mobile unit, in order to carry out the horizontal movement of the needle in a few milliseconds, forces the motor to work always delivering the maximum available torque limiting the minimum movement time to a minimum value, not reducible, and therefore limiting the full speed of the operation;
- a further critical element identified in the movement of the mobile part is the choice of the roller screw connected to the motor. In fact, it has a rather unfavorable transmission ratio since the entire travel stroke of the mobile unit is performed with less than one complete revolution by the motor. This entails the need to exert a high torque by the motor to carry out the movement quickly.
- The need of solving the drawbacks and limitations mentioned with reference to the prior art is therefore felt.
- The following patent allows overcoming all the technical problems and the mechanical and software limitations, both of the manual and of the automatic looping machine used to date.
- The need to overcome the drawbacks and limitations of the solutions of the prior art is met by a looping machine according to claim 1 and by a looping method according to
claim 10. - Further features and advantages of the present invention will appear more clearly from the following description of preferred non-limiting embodiments thereof, in which:
-
figure 1 shows a view of a manual looping machine, of the traditional type; -
figure 2 shows a perspective view of a looping machine according to the present invention; -
figure 3 shows a perspective view of a detail of a looping machine according to the present invention; -
figures 4-5 are schematic views of the operation of a looping machine according to the present invention; -
figure 6 shows a perspective view of a particular plate of the looping machine; -
figure 7 shows a schematic view of the operation of a looping machine according to the present invention. - Elements or parts of elements in common to the embodiments described below are referred to with the same reference numerals.
- With reference to the above figures,
reference numeral 4 globally indicates an overall schematic view of a looping machine according to the present invention. - The
looping machine 4 comprises a fixed unit comprising a support frame 8 and amobile unit 100, supported by said fixed unit, so as to be able to move and appropriately actuate aneedle 10 for the looping operation onfabric 12. - The
mobile unit 100 comprises afeed device 16 of thefabric 12 along a longitudinal direction or axis Y-Y, a positioning device 20 of theneedle 10 along a transverse direction or axis X-X, perpendicular to said longitudinal direction or axis Y-Y and coplanar with thefabric 12, and anactuation device 24 of saidneedle 10 along a vertical direction or axis Z-Z, perpendicular to said longitudinal Y-Y and transverse X-X directions, to perform the looping. - The
feed device 16 of thefabric 12 comprises blocking means 28 of thefabric 12, configured to keep thefabric 12 pressed on thefeed device 16 of thefabric 12. - According to a possible embodiment, said blocking means 28 of the
fabric 12 comprise an articulatedfoot 36 with two rotations capable of uniformly pressing thefabric 12, even in the presence of non-uniform thicknesses of the fabric. - Preferably, said
blocking means 28 are adjustable so as to adjust thefoot pressure 36 on saidfabric 12. - The
feed device 16 of the fabric orfabric 12 comprises anelectric motor 30. - The positioning device 20 of the
needle 10 comprises anelectric motor 30 connected to a roller screw or recirculatingball screw 101, in turn connected to amobile unit 100 which performs the linear translation of the needle along the transverse direction X-X. - The
actuation device 24 of theneedle 10 comprises anelectric motor 30 connected to theneedle 10 with a connecting rod-crank mechanism for performing the alternate stitching movement of theneedle 10. - Preferably, the
needle 10 passes through aparticular plate 38 with ahole 39 for theneedle 10 which limits its deformation and ensures a better seam. - The
fabric 12 is preventively provided with aguide thread 40 inserted inside thefabric 12 so as to identify a plurality of segments 44 (blob). - The
guide thread 40 is preferably made of a phosphorescent material, so as to be easily identified by a suitable optical system orcamera 103. For this purpose, thelooping machine 4 is provided with an ultraviolet light lighting system withneon 52, to highlight saidphosphorescent guide thread 40 48. - According to an embodiment, said ultraviolet light,
lighting system 52 is fitted at the blocking means 28 of thefabric 12. - Preferably, said
guide thread 40 is made of a watersoluble material, so that it can be dissolved in the subsequent washing of the fabric, without having to proceed with its manual removal. - Advantageously, the looping
machine 4 comprises acamera 103 suitable for identifying theguide thread 40. The loopingmachine 4 is further provided with a processing andcontrol unit 56, operatively connected to thecamera 103 and to actuators/electric motor means of thefeed device 16 of thefabric 12, of the positioning device 20 of theneedle 10 and of theactuation device 24 of theneedle 10. - In this way, the processing and
control unit 56 is able to determine in real-time the target position of theneedle 10 depending on theguide thread 40 and to control in real-time thefeed devices 16 of thefabric 12, positioning devices 20 of theneedle 10 andactuation devices 24 of theneedle 10 to reach said target stitching position of theneedle 10. - In particular, the
feed device 16 of thefabric 12 and/or the positioning device 20 of theneedle 10 and/or theactuation device 24 of theneedle 10 comprise respectiveelectric motors 30 with real-time feedback by means of said processing andcontrol unit 56, depending on the target stitching position of theneedle 10. - The option and/or implies that at least one of the
feed device 16 of thefabric 12, the positioning device 20 of theneedle 10 and theactuation device 24 of theneedle 10 comprises respective real-time feedbackelectric motors 30; preferably at least two of saiddevices electric motors 30 and, even more preferably, all thedevices electric motors 30. - According to a possible embodiment, the processing and
control unit 56 is programmed so that saidelectric motors 30 are controlled at a variable pitch in real-time depending on the target stitching position of theneedle 10. - The operation of the looping machine according to the present invention will now be described.
- As mentioned, the looping machine according to the present invention is able to perform the looping operation in a particularly efficient manner.
- In particular, the looping method of a
fabric 12 comprises the steps of: - providing a
fabric 12 on which to perform the looping, saidfabric 12 being provided with afluorescent guide thread 40 that enters and exits thefabric 12 forming segments (blob) 44, - acquisition of a
fabric frame 12 by means of acamera 103, so as to identify the position of said segments (blob) 44, - calculating
primary centroids 104 representing the midpoint of the areas of the segments (blob) 44 of theguide thread 40; saidprimary centroids 104 allow identifying the target stitching position of the loop orcalculated stitches 60 by searching for the intermediate position between theprimary centroids 104; - elimination of
secondary centroids 68 which cause errors in the identification of the correct sewing point, adjacent to the segments (blob) 44; - performance of the looping stitching at the calculated points of the target stitches 64.
- The step of carrying out the stitching provides for the calculation, in real-time, of the target stitching position of the
needle 10 depending on theguide thread 40, the real-time actuation of thefeed devices 16 of thefabric 12, the positioning devices 20 of theneedle 10 andactuation devices 24 of theneedle 10 to reach said target stitching position of theneedle 10. - The exclusion step of the
secondary centroids 68 comprises the step of eliminatingsecondary centroids 68 positioned on the left, with respect to the transverse direction X-X, and at a same height, along the vertical direction Z-Z, of theprimary centroids 104 of the segments (blob) 44 of theguide thread 40. - Preferably, the looping method also provides for the step of eliminating the segments (blob) 44 having a smaller area with respect to a predetermined threshold value.
- After identifying the
primary centroids 104 of the segments (blob) 44, we proceed to the interpolation thereof by means of an interpolation line. - Moreover, to determine the next stitching or looping point, two consecutive segments (blobs) 44', 44'' are identified by means of the camera 103: the longitudinal coordinate of the stitching point corresponds to the mean of the longitudinal coordinates of the
centroids 104 of theguide thread 40 and the transverse coordinate of the stitching point lies along said interpolation line. - As can be appreciated from the description, the present invention allows overcoming the drawbacks of the prior art.
- In fact, the looping machine of the present invention is an automatic machine completely innovative in the way it operates with respect to a known manual looping machine.
- In particular, as described, this machine, due to a special vision system, is able to independently identify the stitches, to calculate in real-time the looping step to be made and then to position the needle at these points following the indications of a particular control algorithm. In fact, the needle can move in all directions on the fabric going to center the stitch that the camera captures in real time.
- The solution of the present invention allows the looping operation to be modernized, solving the limits of the current technology, increasing productivity, improving the quality of the processed fabrics, reducing the costs of processing and improving the working conditions of the workers involved in the looping.
- In fact, the looping machine can be used by an untrained operator who simply has to position the fabric at the base of the needle and operate the looping machine with a command. The ease of use therefore makes the training time of personnel almost non-existent.
- Moreover, the looping machine of the present invention is flexible; it does not require any changes to the setup to change the fineness of the fabric as it automatically calculates the pitch, between one stitch and the other, in real-time mode.
- The processing speed is far higher than a manual looping machine; you can easily exceed a speed of 700 points per minute.
- The quality of the work no longer depends on a person, but is guaranteed by the reliability of a computer.
- The looping operation is much less expensive and simpler to execute, at the same time increasing productivity and reducing processing times.
- All the problems related to the health of the operator due to the manual looping are solved.
- Summing up, the motors are no longer controlled with a fixed pitch, as in the known automatic solutions, but receive real-time instructions on which the next movement to be performed by a feedback control must be. The mechanics is simplified so as to overcome all the speed limits caused by the technical choices of the known automatic solutions, so as to achieve and exceed even 700 PPM and beyond. The needle can move in all directions on the fabric going to center the stitch that the camera captures in real time.
- A man skilled in the art may make several changes and adjustments to the looping machine and to the looping methods described above in order to meet specific and incidental needs, all falling within the scope of protection defined in the following claims.
Claims (15)
- Looping machine (4), comprising:- a fixed unit comprising a support frame (8),- and a mobile unit (100) comprising:- a feed device (16) of the fabric (12) along a longitudinal direction (Y-Y)- a positioning device (20) of a needle (10) along a transverse direction (X-X), perpendicular to said longitudinal direction (Y-Y) and coplanar with the fabric (12),- an operating device (24) of said needle (10) along a vertical direction (Z-Z), perpendicular to said longitudinal (Y-Y) and transverse (X-X) directions, to perform the looping,characterized in that- the machine (4) comprises a camera (103) suitable for identifying a guide thread (40) arranged on at least one fabric (12) to be stitched, said guide thread (40) being inserted inside the fabric (12) so as to identify a plurality of segments (blob) (44),- the machine (4) comprises a processing and control unit (56), operatively connected to the camera (103) and to actuators of the feed device (16) of the fabric (12), of the positioning device (20) of the needle (10) and of the actuation device (24) of the needle (10),- so as to determine in real-time the target position of the needle (10) depending on the guide thread (40) and to control in real-time the feed devices (16) of the fabric (12), positioning devices (20) of the needle (10) and actuation devices (24) of the needle (10) to reach said target stitching position of the needle (10).
- Looping machine (4) according to claim 1, wherein the feed device (16) of the fabric (12) and/or the positioning device (20) of the needle (10) and/or the actuation device (24) of the needle (10) comprise respective electric motors (30) with real-time feedback by means of said processing and control unit (56), depending on the target stitching position of the needle (10).
- Looping machine (4) according to claim 2, wherein the processing and control unit (56) is programmed so that said electric motors (30) are controlled at a variable pitch in real-time depending on the target stitching position of the needle (10).
- Looping machine (4) according to any one of the preceding claims, wherein the fixed unit supports the devices (16,20,24) of the mobile unit (100).
- Looping machine (4) according to any one of the preceding claims, wherein the feed device (16) of the fabric (12) comprises blocking means (28) of the fabric (12), configured to keep the fabric (12) pressed against a support plate (32), wherein said blocking means (28) of the fabric (12) comprise a foot (36) articulated with two rotations capable of uniformly pressing the fabric (12), even in the presence of non-uniform thicknesses of the fabric (12).
- Looping machine (4) according to any one of the preceding claims, wherein the positioning device (20) of the needle (10) comprises an electric motor (30) connected to a roller screw or recirculating ball screw (101), in turn connected to a mobile unit (100) which performs the linear translation of the needle (10) along the transverse direction (X-X).
- Looping machine (4) according to any one of the preceding claims, wherein the looping machine (4) is equipped with an ultraviolet-light, lighting system (52), to highlight said guide thread (40), said guide thread (40) being phosphorescent.
- Looping machine (4) according to claim 7, wherein said ultraviolet-light, lighting system (52) is fitted at the blocking means (28) of the fabric (12).
- Looping machine (4) according to any one of the preceding claims, wherein the needle (10) passes through a plate (38) provided with a hole (39) that limits its deformation and ensures better stitching.
- Looping method of a fabric (12) comprising the steps of:- providing a fabric (12) on which to perform the looping, said fabric (12) being provided with a fluorescent guide thread (40) that enters and exits the fabric (12) by means of segments (blob) (44),- acquisition of a fabric frame (12) by means of a camera (103), so as to identify the position of said segments (blob) (44),- calculation of primary centroids (104) of segments (blob) (44) of the guide thread (40), and of the areas of said segments (blob) (44),- identification of the target stitching points (60) of the stitches (64) to be looped, as a median point between the primary centroids (104),- elimination of secondary centroids (68) not to be considered, adjacent to the primary centroids (104),- performance of the looping stitching at the target stitching points (60) of the target stitches (64).
- Looping method of a fabric (12) according to claim 10, wherein the step of carrying out the stitching provides for the calculation, in real-time, of the target stitching position of the needle (10) depending on the guide thread (40), the real-time actuation of the feed devices (16) of the fabric (12), the positioning devices (20) of the needle (10) and the actuation devices (24) of the needle (10) to reach said target stitching position of the needle (10).
- Looping method of a fabric (12) according to claim 10 or 11, wherein the exclusion step of the secondary centroids (68) comprises the elimination step of secondary centroids (68) positioned to the left, with respect to the transverse direction (X-X), and at the same height, along the vertical direction (Z-Z), of the centroids (104) of the segments (blob) (44), said step providing for the calculation of an interpolation line of all the primary centroids (104) and the verification of the position of the secondary centroids (68) at said interpolation line.
- Looping method of a fabric (12) according to claim 10, 11 or 12, wherein a step of eliminating segments (blob) (44) having an area smaller than a predetermined threshold value is provided for.
- Looping method of a fabric (12) according to claim 10, 11, 12 or 13, wherein, having identified the primary centroids (104) of the segments (blob) (44), the same are interpolated by means of an interpolation line.
- Looping method of a fabric (12) according to claim 14, wherein, during the looping, to determine the next stitching or looping point, two consecutive segments (blobs) (44', 44") are identified by means of the camera (103), and wherein the longitudinal coordinate of the stitching point corresponds to the mean of the longitudinal coordinates of the primary centroids (104) of the consecutive segments (blobs) (44', 44''), of the guide thread (40), and the transverse coordinate of the stitching point lies along said interpolation line.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT102018000007417A IT201800007417A1 (en) | 2018-07-23 | 2018-07-23 | PERFECTED TRIMMING MACHINE AND RELATED TRIMMING METHOD |
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EP3599305A1 true EP3599305A1 (en) | 2020-01-29 |
EP3599305B1 EP3599305B1 (en) | 2021-06-02 |
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EP19164181.0A Active EP3599305B1 (en) | 2018-07-23 | 2019-03-20 | Improved linking machine and related method |
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EP (1) | EP3599305B1 (en) |
JP (1) | JP2020014831A (en) |
CN (1) | CN110747586B (en) |
ES (1) | ES2886878T3 (en) |
IT (1) | IT201800007417A1 (en) |
MA (1) | MA50419B1 (en) |
MD (1) | MD3599305T2 (en) |
MX (1) | MX2019003629A (en) |
NI (1) | NI201900028A (en) |
PT (1) | PT3599305T (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115305656A (en) * | 2021-05-06 | 2022-11-08 | 桑德森瑞玛集团有限公司 | Linking machine provided with an improved guide for aligning the edges of two fabrics to be joined |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PT3733945T (en) | 2019-04-30 | 2022-01-31 | Santex Rimar Group S R L | Linking machine comprising a guide for correctly positioning a single collar and a piece of knitwear with respect to one another |
Citations (4)
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EP0275505A1 (en) * | 1986-12-19 | 1988-07-27 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for linking knitted fabric pieces and apparatus thereof |
EP0930389A2 (en) * | 1998-01-19 | 1999-07-21 | Dan Co., Ltd. | Process and apparatus for detecting loop stitch of tubular knitted fabric, and apparatus for linking tubular knitted fabric |
EP0971061A1 (en) * | 1997-03-24 | 2000-01-12 | Hashimoto, Yoshiko | Sewing system and sewing method |
US20020129626A1 (en) * | 2001-03-14 | 2002-09-19 | Dan Co., Ltd. | Method and apparatus for linking plain knitted fabrics |
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JPH09103589A (en) * | 1995-10-13 | 1997-04-22 | Tsudakoma Corp | Collar attaching linking device |
JP2001334087A (en) * | 2000-05-29 | 2001-12-04 | Yamato Sewing Mach Co Ltd | Presser foot system for sewing machine |
JP2003320186A (en) * | 2002-05-07 | 2003-11-11 | Dan:Kk | Linking machine |
FR2910497B1 (en) * | 2006-12-21 | 2010-03-26 | Erbe | REMINDER MACHINE ASSEMBLING LACUNE PATCHES USING A THREAD THROUGH SOME GAPS |
CN205242031U (en) * | 2015-12-29 | 2016-05-18 | 重庆市合川区通用汽车配件制造厂 | Process pressing mechanism is sewed up to braided bag |
CN205501596U (en) * | 2016-03-10 | 2016-08-24 | 常州市劲普自动化设备有限公司 | Automatic sewing machine material feeding unit |
-
2018
- 2018-07-23 IT IT102018000007417A patent/IT201800007417A1/en unknown
-
2019
- 2019-03-20 ES ES19164181T patent/ES2886878T3/en active Active
- 2019-03-20 PT PT191641810T patent/PT3599305T/en unknown
- 2019-03-20 MA MA50419A patent/MA50419B1/en unknown
- 2019-03-20 EP EP19164181.0A patent/EP3599305B1/en active Active
- 2019-03-20 MD MDE20200874T patent/MD3599305T2/en unknown
- 2019-03-27 JP JP2019059793A patent/JP2020014831A/en active Pending
- 2019-03-28 NI NI201900028A patent/NI201900028A/en unknown
- 2019-03-28 MX MX2019003629A patent/MX2019003629A/en unknown
- 2019-03-29 CN CN201910251849.9A patent/CN110747586B/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0275505A1 (en) * | 1986-12-19 | 1988-07-27 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for linking knitted fabric pieces and apparatus thereof |
EP0971061A1 (en) * | 1997-03-24 | 2000-01-12 | Hashimoto, Yoshiko | Sewing system and sewing method |
EP0930389A2 (en) * | 1998-01-19 | 1999-07-21 | Dan Co., Ltd. | Process and apparatus for detecting loop stitch of tubular knitted fabric, and apparatus for linking tubular knitted fabric |
US20020129626A1 (en) * | 2001-03-14 | 2002-09-19 | Dan Co., Ltd. | Method and apparatus for linking plain knitted fabrics |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115305656A (en) * | 2021-05-06 | 2022-11-08 | 桑德森瑞玛集团有限公司 | Linking machine provided with an improved guide for aligning the edges of two fabrics to be joined |
US11932978B2 (en) | 2021-05-06 | 2024-03-19 | Santex Rimar Group S.R.L. | Linking machine provided with an improved guide for aligning two fabric edges to be joined |
Also Published As
Publication number | Publication date |
---|---|
ES2886878T3 (en) | 2021-12-21 |
MD3599305T2 (en) | 2021-11-30 |
MX2019003629A (en) | 2020-01-24 |
IT201800007417A1 (en) | 2020-01-23 |
MA50419A (en) | 2021-03-24 |
JP2020014831A (en) | 2020-01-30 |
NI201900028A (en) | 2020-04-02 |
MA50419B1 (en) | 2021-08-31 |
EP3599305B1 (en) | 2021-06-02 |
CN110747586A (en) | 2020-02-04 |
PT3599305T (en) | 2021-08-11 |
CN110747586B (en) | 2023-07-11 |
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