Delayed-inlay knitting machine
By employing a knee-bar system in a belt knitting machine to alter the weft needle movement, delay insertion into the shed, and perform a small lifting motion, the shortcomings of existing weft needle drives are overcome. This achieves a larger shed, a smaller weft needle radius, and simplified weft yarn changes, thereby improving the reliability of the knitting process and the quality of the knitted fabric.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JACOB MÜLLER FRICK AG
- Filing Date
- 2023-08-23
- Publication Date
- 2026-06-09
AI Technical Summary
Existing weft needle drives in belt knitting machines have problems such as premature weft needle insertion into the shed, small shed opening, large weft needle radius, complex weft yarn replacement, and unstable knitting process, which can easily lead to knitting defects, especially at high knitting speeds.
A knee lever system is arranged between the crank drive and the weft yarn shaft. The knee lever system changes the movement of the weft needle, causing it to enter the shed at a delayed time and perform a small return lifting motion outside the shed. The weft yarn is changed in conjunction with the normal heddle changing time, and the insertion into the shed is delayed in the braiding yarn coupling device.
It achieves a larger shed opening, reduces weaving defects, allows for a smaller weft needle radius design, simplifies the weft yarn change process, and improves the reliability of the weaving process and the quality of the woven fabric.
Smart Images
Figure CN122180808A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a knitting machine with delayed weft insertion, particularly a belt knitting machine and its applications. Background Technology
[0002] In belt knitting machines, the driving of the weft needle motion has long been a problem discussed in the prior art. For example, in CH 633 331, it is relied upon to connect the weft needle driver to the main drive shaft of the knitting machine via a knee-bar system. This weft needle driver... Figure 2 This is illustrated schematically. Therefore, Figure 4 The geometry of the weft needle movement is schematically illustrated, and Figure 4a The path of the weft needle movement with a thread insertion delay of approximately 85° is shown.
[0003] As proposed in WO 94 / 26964 A1 and WO 2012 / 163571 A2, a belt knitting machine can also have multiple replaceable weft yarns—preferably weft yarns of different colors, but of course also weft yarns of different materials or material thicknesses—which can then be changed by weft yarn changing. In the case of WO 2012 / 163571 A2, weft yarn changing is performed via heald frames. In WO 2017 / 042015 A1, a loom is proposed in which braided yarn or cover yarn is incorporated. In WO 2017 / 216117 A2, the mechanical connection between the spindle of the belt knitting machine and the weft yarn insertion is abandoned, and weft yarn movement is performed by means of linear actuators or rotary actuators. However, all these applications suffer from the problem that the weft yarn insertion needle should not enter the shed prematurely, whether simply because the shed is already more open, or because more time is needed to ensure a safe and trouble-free weft yarn change or the insertion of braided yarn or cover yarn. Therefore, the simplest way to achieve this goal is to simply move the weft needle a certain distance outside the shed. However, this has a significant drawback: it results in a useless long distance and an unfavorable large acceleration, which must be avoided—especially at high knitting speeds. Summary of the Invention
[0004] The object of this invention is to provide a knitting machine, particularly a belt knitting machine, in which the insertion of the weft needle into the shed can be delayed without having to accept the aforementioned disadvantages.
[0005] The object of the present invention is achieved by the loom according to claim 1. Therefore, the measure of the present invention first has the result that, for this type of drive for the weft needles, wherein the knee lever system is arranged between the crank drive and the weft beam lever, the movement of the weft beam is distorted. The movement of the weft needles, driven by the weft beam through the second lever system, is altered by the action of the knee lever, causing the weft needles to enter the shed in a delayed manner or exit the shed in an advanced manner, respectively. Furthermore, when they are outside the shed, they perform a small return lifting motion. This results in the following advantage – according to the aforementioned object – namely…
[0006] Advantage 1: Larger shed opening:
[0007] Using a weft needle drive according to the prior art, the shed opening at the point where the weft needle enters the shed is still very small. In contrast, the shed in the weft needle drive device according to the invention is approximately twice as large. This improves safety in preventing under- or over-stitching of warp yarns, which tend to adhere or stick together due to electrostatic charge. The weaving process becomes more reliable, and the produced fabric has far fewer weaving defects.
[0008] Advantage 2: Smaller weft needle radius:
[0009] With conventional weft needle drives, the reed moves only very slightly away from the reed at the point of insertion into the shed. However, with the measure of this invention, the reed has moved significantly further away from the reed at the point of insertion. This results in another advantage: a smaller weft needle radius can be selected without the weft needle colliding with the reed as it passes through the shed. With a smaller weft needle radius, a more compact design of the knitted section is possible, and the mechanical load on the weft needle drive is reduced (less mass to be accelerated).
[0010] Advantage 3: Simple and reliable weft yarn replacement
[0011] The weft needle actuator according to the invention is also advantageous in looms with weft yarn changing capabilities. As described in WO2012 / 163571, the weft yarn to be read into the forked weft needle is brought to the read-in or read-out position by moving the selected heddle. However, with the weft needle actuator according to the prior art, it is not possible to use the normal heddle changing time for this purpose. Instead, the heddle changing time must be selected earlier for readout and later for readout. This is not a problem with electronically controlled heddles. However, for mechanically operated heddles, special eccentric wheels or warp elements are required, and the loom setup is correspondingly complex. Since more time is available for weft yarn changing in the weft needle actuator according to the invention, and since the weft needle performs the small return lifting motion as described above, the normal heddle changing time can be used for weft yarn changing. This greatly simplifies the loom setup and makes the weft yarn changing process more reliable.
[0012] Advantage 4: More reliable stitching of impregnated guide needles in looms that incorporate braided yarn.
[0013] Delayed weft needle entry into the shed is also highly advantageous in looms equipped with a device for joining knitting yarns. In this device, at least one dipped guide needle is inserted from above into the open shed as needed, bringing at least one knitting or patterned yarn into the lower shed for overstitching by the weft needle, thus joining it to the knitted fabric. The dipped guide needle has very little time available for the stitching motion (typically around 90 degrees on the machine) because it can only begin the stitching motion after the reed beats in and must be sufficiently deep within the lower shed before crossing with the weft needle. Due to the delayed weft needle insertion, the available time is increased by approximately 25%, allowing for deeper stitching by the dipped guide needle and thus allowing for a larger and more reliable knitting yarn shed.
[0014] The elements used in this invention, as well as the elements claimed and described in the following exemplary embodiments, are not limited by any particular conditions in terms of their size, shape, material use, and technical design, and therefore selection criteria known in the respective application fields can be used without restriction. Attached Figure Description
[0015] An example of the loom will now be described in more detail with reference to the accompanying drawings, which show:
[0016] Figure 1 A loom (perspective ground) having a knee bar system according to an exemplary embodiment of the present invention.
[0017] Figure 2 A loom with a weft needle drive based on existing technology (perspective ground).
[0018] Figure 3 according to Figure 1 The geometric relationship of the movement of the weft needle in an exemplary embodiment of the present invention.
[0019] Figure 3a according to Figure 1 and Figure 3 The movement of the weft needle tip at approximately 110° loom angle during thread insertion, as described in an exemplary embodiment of the present invention.
[0020] Figure 4 according to Figure 2 Based on the geometric relationship of the movement of the weft needle in existing technology,
[0021] Figure 4a according to Figure 2 and Figure 4 The existing technology involves the movement of the weft needle tip inserting the thread at approximately 85° loom angle.
[0022] Figure 5 It is based on Figure 1 and Figure 3 A top view of the knitting section at the point in time when the weft needle enters the shed, according to an exemplary embodiment of the present invention.
[0023] Figure 5a The side view of the open shed shown is an exemplary embodiment of the present invention.
[0024] Figure 6 according to Figure 2 and Figure 4 A top view of the knitting section at the point when the weft needle enters the shed, based on existing technology.
[0025] Figure 6a according to Figure 6 Side view of the open shed (existing technology).
[0026] Figure 7 A schematic structure of a heald for weft yarn replacement according to an exemplary embodiment of the present invention.
[0027] Figure 8a according to Figure 1 and Figure 7 The movement of the weft needle according to an exemplary embodiment of the present invention,
[0028] Figure 8b according to Figure 1 and Figure 7 The movement of the weft control heald according to an exemplary embodiment of the present invention,
[0029] Figures 9a to 9i according to Figure 7 The process of weft yarn change in an exemplary embodiment,
[0030] Figure 10a according to Figure 2 and Figure 7 Based on the movement of the weft needle in existing technology,
[0031] Figure 10b according to Figure 2 and Figure 7 Based on existing technology, the movement of the weft yarn control heald is achieved.
[0032] Figures 11a to 11i Based on the process of weft yarn change in existing technology
[0033] Figure 12 The position of the impregnation guide needle at the reed weft insertion point according to another exemplary embodiment of the present invention.
[0034] Figure 13 according to Figure 12An exemplary embodiment of reliable stitching of an impregnated guide needle at the point in time the weft needle is inserted into the shed. Detailed Implementation
[0035] Figure 1 An embodiment of the invention is illustrated, namely a loom, which includes a reed 10, a drive motor 12, a main shaft 45 with a drive crank drive 13, a warp feeder 14, and a shed forming device 16 adapted to form a shed 18. The shed 18 includes a knitting section 15 for producing a woven fabric 20 by inserting a weft yarn 24 by means of a weft insertion device 40 having a weft needle 42. The weft needle 42 is driven by a weft shaft 44, which is connected to the main shaft 45 or the crank drive 13 by means of a knee system 46. Embodiments of the invention according to this exemplary embodiment and according to... Figure 2 The looms referenced herein differ from those of the prior art, particularly in that they are connected to the spindle 45 by means of the weft needle driver via the knee system 46.
[0036] Although in embodiments according to the prior art the movement of the weft needle 42 is approximately sinusoidal—such as Figure 4 and 4a As shown—however, the movement of the weft needle 42, driven by the improved drive system with knee bar 46, is actually altered by the action of knee bar 46, causing it to enter the shed in a delayed manner or leave the shed in an advanced manner—as Figure 3 and 3a As shown. In addition, when they are outside the shed 18, they perform a small return lifting motion.
[0037] Figure 5 or Figure 5a and Figure 6 or Figure 6a Each shows a top view of the knitted section at the point where the weft needle enters the shed and a side view of the open shed. Using a weft needle driver according to the prior art, the shed h at the point where the weft needle enters the shed 18 is still very small, as shown from... Figure 6 and 6a As can be seen from this. In comparison, the shed opening h in the weft needle driver according to an exemplary embodiment of the present invention is approximately twice as large, as in Figure 5 and 5a As can be seen in the image. This improves safety by preventing under- or over-stitching of the warp yarns, which tend to stick together or clump together due to electrostatic charge. The weaving process becomes more reliable, and the resulting fabric has far fewer weaving defects. Figure 6 It can also be seen that in a traditional weft needle drive device, the reed 10 is positioned at the point where the weft needle inserts into the shed ( Figure 6 Measurement A) is only very slightly away from the reed weft. Figure 5As shown, the reed 10 is significantly further away from the beat-up point at the time of weft needle insertion. This leads to another advantage: a smaller weft needle radius R can be selected without causing the weft needle 42 to collide with the reed 10 as it passes through the shed 18. With a smaller weft needle radius R, a more compact design of the knitted section is possible, and the mechanical load on the weft needle drive is reduced due to the smaller mass to be accelerated.
[0038] In another exemplary embodiment of the invention, the application is a simple and reliable weft yarn change without abandoning the aforementioned features and advantages according to the exemplary embodiments described above. The weft needle driver according to this exemplary embodiment is used in a loom with weft yarn change functionality. As described in WO2012 / 163571 A2, the weft yarn to be read into the forked weft needle is brought to the read-in or read-out position by moving selected heddles 32 and 35. However, for such a weft needle driver, it is not possible—as from… Figure 10a , 10b As can be seen from 11a to 11—the normal heddle changeover time is used for this purpose. Instead, the heddle changeover time must be selected earlier for readout and later for readin, as in WO 2012 / 163571 A2. Figure 3 As shown in the diagram. This is not a problem with electronically controlled heddles. However, for mechanically operated heddles 32 and 35, special eccentric wheels or warp elements are required, and the loom setup becomes correspondingly complex.
[0039] Because of the Figure 1 and Figure 7 In the exemplary embodiment of the weft needle drive, more time is available for weft yarn changing, and because the weft needle 42 performs a small return lifting motion in the direction of the knitted fabric as described above, the normal heddle changing time can be used for weft yarn changing. This greatly simplifies the loom setup and makes the weft yarn changing process more reliable. Figure 7 As shown, the weft needles open toward the axis (fork 43). The weft guides 36 and 33, connected to the foremost heddles 32 and 35, move via the heddle movement, causing the desired weft color to be read into or out of the open weft needle at the desired time. See [reference needed]. Figure 8a , 8b 9a to 9i. In Figure 8a The movement of the weft needle was recorded in the middle. Figure 8b The path of the two weft control heddles 32 and 35 or the selection needles 36 and 33 is recorded respectively. Figure 8bThe zero line of the vertical axis corresponds to the height of the movement plane of the weft needle 42. At the point when the weft needle is in its return lifting motion, the first weft yarn is read out at position A at approximately a machine angle of 325 degrees. The corresponding control heald 35, or the selection needle 33 connected to it, is in downward motion at this point and slightly below the weft needle (height - H). A ).from Figure 9d It can be seen that at this point in time, the open fork 43 of the weft needle tip crosses the distance FG, causing the weft yarn 34 to no longer be held by the fork 43 and fall downwards from there. During further movement, the weft needle continues its return lifting motion in the direction of weaving the fabric. The control heald 32 and the selection needle 36 connected to it are already above the weft needle level during the upward movement at this point in time, causing the weft yarn 37 to wrap slightly around the weft needle 42 from below, as... Figure 9e As shown. Figure 9f This illustrates how weft yarn 37 jumps into fork 43 as it crosses distance KL during its movement away from the woven fabric again. See also Figure 8a Position E or Figure 8b The stroke H in E Then, the weft yarn 37 remains in the fork 43 and is inserted into the shed until the control heald 32 or the selection needle 36 connected to it moves downward again.
[0040] exist Figure 10a , Figure 10b and Figures 11a to 1 Figure 1 illustrates a scenario where a weft yarn change is performed using normal heald change time with a known weft needle drive. For example... Figure 11f or Figure 10a As shown in / 10b (position A), the reading of the first weft yarn 34 is performed at a machine angle of approximately 40 degrees. The reading of the second weft yarn 37 is, in principle, based on... Figure 10b A machine angle of approximately 320 degrees would be possible, since from that point onward, the selection needle 36 is positioned above the plane of movement of the weft needle. However, since the fork 43 of the weft needle 42 has already passed through the weft yarn 37 presented for reading at 320 degrees, it is not carried by the fork. When the weft needle moves back along the direction of the knitted fabric after the turning point, the selection needle 36 has moved upward so far that the presented weft yarn 37 is understitched by the weft needle 42 and is not carried by the fork 43 (see [link]). Figure 11g and 11h Therefore, the weft needle moves into the shed without a weft yarn—meaning the weft yarn change process is unsuccessful.
[0041] exist Figure 12Another exemplary embodiment is shown, and the measures of the invention result in a more reliable stitching of the dipped guide needle 52 in a machine equipped with a device for joining the knitting thread 60. The delayed entry of the weft needle 42 into the shed 18 is actually very advantageous in a machine equipped with a device for joining the knitting thread 60. In this device, at least one dipped guide needle 52 is stitched into the open shed 18 from above as needed, bringing the knitting thread or patterned thread 60 into the lower shed so that it can be wrapped by the weft needle 42, thereby joining it to the knitted fabric 20. Thus, the dipped guide needle 52 swings back and forth in the warp direction in sync with the reed 10. Therefore, at the reed beat-up point, it must be pulled up so far that it does not collide with the combing shaft 53, which extends above the knitting section in the weft direction. The dipped guide needle 52 has almost no time available for the stitching motion (typically about 90 degrees of machine angle) because it can only begin the stitching motion after the reed beat-up and must be sufficiently deep in the lower shed before crossing with the weft needle 42. Due to the delayed insertion of the weft needle, the available time is increased by approximately 25%, which allows for deeper stitching of the impregnated guide needle 52 and thus allows for larger and more reliable knitting sheds.
[0042] List of reference numerals
[0043] 10 reeds
[0044] 12 drive motors
[0045] 13 Crank Drive
[0046] 14 Warp Feeder
[0047] 15 Weaving sections
[0048] 16. Roof Forming Device
[0049] 18 sheds
[0050] 20 woven fabrics
[0051] 24 weft yarn
[0052] 26 warp yarns
[0053] 30-weft yarn changing device
[0054] 32 Comprehensive Line 1
[0055] 33 weft yarn selection needle 2
[0056] 34 weft yarn 2
[0057] 35 Comprehensive Line 2
[0058] 36 weft yarn selection needle 1
[0059] 37 weft yarn 1
[0060] 38 Comprehensive Line 3
[0061] 39 Comprehensive Line 4
[0062] 40 weft yarn insertion device
[0063] 42 weft needle
[0064] 43 forks
[0065] 44 weft yarn shaft
[0066] 45 spindle
[0067] 46-knee bar system
[0068] 47 weft yarn beam
[0069] 50 Device for combining braided yarn
[0070] 52 Impregnated Guide Needle
[0071] 53 combing shaft
[0072] 60 braided yarn or patterned yarn
[0073] 61 lower shed
Claims
1. A loom comprising at least one main shaft (45) having a crank drive (13), a warp feeder (14), a knitting section having a shed forming device (16) for forming a shed (18), a reed (10), a weft insertion device (40) having weft needles (42), and a weft shaft (44), wherein, The weft insertion device (40) is cooperatively connected to the main shaft (45) of the loom via a crank drive (13), wherein a knee bar system (46) is arranged between the crank drive (13) and the weft shaft (44), and the weft insertion device (40) further includes a second bar system for driving the weft needle (42), wherein the movement of the weft needle (42) is altered by the action of the knee bar, such that the weft needle enters the shed (18) in a delayed manner and / or exits the shed (18) in an advanced manner.
2. The loom according to claim 1, wherein, The weft insertion device (40) is also formed in such a way that when the weft needle (42) is outside the shed (18), the weft needle (42) performs a return lifting motion in the direction toward the woven fabric.
3. The loom according to claim 1 or 2, wherein, The loom also includes a device for weft yarn changing, which is preferably performed by means of the movement of the selected heald (32, 35) and the selection needles (36, 33) respectively associated with the heald.
4. The loom according to claim 3, wherein, The tip of the weft needle (42) is provided with a fork (43), and the weaving mechanism causes the weft yarn (36, 33) to be read to be brought into the read position or the read position by means of the movement of the selected heddle (32, 35).
5. The loom according to claim 4, wherein, The loom is configured such that at the point in time when the weft yarn (42) is in the return lifting motion, the readout of the weft yarn (34) can occur at a machine angle of 315 to 335°, preferably 320 to 330°.
6. The loom according to claim 5, wherein, The weaving mechanism causes the corresponding control heald (35) and the selection needle (33) connected to the control heald (35) to be in downward motion and slightly below the weft needle (height - HA) at the time of reading.
7. The loom according to claim 6, wherein, The loom is configured such that at the time of reading, the open fork (43) of the weft needle tip is positioned such that the weft yarn (34) is no longer held by the fork (43) and falls downward from the fork (43).
8. The loom according to claim 7, wherein, The loom is constructed such that, during further movement, the weft needle (42) continues its return lifting motion in the direction of the woven fabric, while the control heald (32) and the selection needle (36) connected to the control heald (32) are already above the level of the weft needle during the upward movement, causing the weft yarn (37) to wrap slightly around the weft needle from below.
9. The loom according to claim 8, wherein, The loom is constructed such that, during further movement, the weft needle (42) completes its return lifting motion and moves away from the woven fabric again, thereby causing the weft yarn (37) slightly wrapped around the weft needle (42) from below to slide toward the open fork (43) until it finally jumps into the open fork (43) and is carried by the open fork.
10. The loom according to any one of claims 1 to 9, wherein, The loom also includes a device (50) for combining the braided yarn, through which an impregnated guide needle (52) selectively introduces the braided yarn or patterned yarn (60) from above into the open shed (18), such that the braided yarn or patterned yarn is wrapped by the weft needle (42) and thus combined into the braided fabric.
11. The loom according to claim 10, wherein, The loom is configured such that the insertion of the weft needle (42) into the shed (18) is delayed by means of the knee system (46), and the impregnated guide needle (52) thereby pivots forward and backward in sync with the reed along the warp direction.
12. The loom according to claim 11, wherein, The loom is configured such that, due to the delayed weft needle insertion, the time available for the dipped guide needle (52) to insert the knitting thread (60) into the lower shed (61) is increased by at least 20%, preferably by at least 25%.