A positive feed for a circular weft knitting machine

Abstract

The present application relates to a kind of knitting circular weft machine, provide a kind of knitting circular weft machine active yarn feeder, including controller, yarn feeder body, yarn defect filter, transmission shaft, hall induction device and adjusting seat, the adjusting seat is located in the yarn feeder body below the inlet or the side of the inlet of the yarn storage wheel, the yarn defect filter is located on the adjusting seat and the yarn of inlet mouth is fed to carry out yarn cleaning, the adjusting seat can be eccentric positioning adjustment yarn defect filter on the position of yarn feeder body in turn make the yarn cleaning gap of yarn defect filter according to the quick adjustment of yarn count, the hall induction device includes magnet and hall switch, the magnet is located in the yarn storage wheel, the hall switch is located on the yarn storage wheel, the hall switch detects whether there is yarn winding yarn storage information sent to controller on the yarn storage wheel in real time.This application solves the problem that the yarn defect filter of the existing active yarn feeder is inconvenient to adjust yarn cleaning gap, and the number of yarn storage turns of the yarn storage wheel and whether yarn winding cannot be effectively detected.

Description

Technical Field

[0001] This invention relates to the field of circular knitting machines, and particularly to a positive yarn feeder for circular knitting machines. Background Technology

[0002] The yarn feeder is a crucial component of a circular knitting machine. It mainly consists of a housing, a main shaft mounted on it, and a yarn feed wheel. A pressure ring and a tension disc are fitted onto the yarn feed wheel. The main shaft is located at the center of the yarn feed wheel and drives its rotation to store yarn. Yarn storage involves feeding and storing the yarn on the yarn feed wheel, while yarn feeding involves outputting the yarn from the yarn feed wheel via the tension disc. In the production of high-quality weft-knitted fabrics, a yarn feeder is needed to control the size of the knitting loops and stabilize the yarn tension during knitting. Currently available yarn feeders mainly include: 1. A belt-type fixed-length yarn feeder, mainly used for fixed-length yarn input when knitting jacquard products; 2. A motor-driven fixed-tension yarn feeder, mainly used for fixed-tension yarn input when knitting jacquard products; 3. A belt-type fixed-length and fixed-tension yarn feeder, which mechanically connects the first two types and can be used for yarn input in various products by changing its application method. For example, Chinese Patent No. CN202310853990.2 discloses a tension detection yarn feeder and a tension feedback yarn feeder control system. The tension detection yarn feeder includes a support, a housing located at the bottom right side of the support, a tension sensor inside the housing, a yarn outlet bracket located to the left of the tension sensor, a first yarn outlet eye fixed on the yarn outlet bracket, and a second yarn outlet eye located to the right of the tension sensor. A tension detection circuit board is located inside the housing. The tension sensor is installed at an angle, with its strain gauge located near the first yarn outlet eye, and the free end of the strain gauge located at the bottom. This invention can accurately detect the yarn tension data while feeding yarn and transmit the tension data to the knitting machine in real time. The main controller of the knitting machine controls the electric camshaft component to drive the camshaft to adjust its vertical position, thereby adjusting the yarn feed and tension.

[0003] For example, CN202222604645.9 discloses a yarn feeder for a small circular knitting machine, comprising a yarn feeder body; characterized in that a bracket is installed on the top of one end of the yarn feeder body, and a tension wheel adjustment assembly is installed on the yarn feeder body and the bracket; a yarn feeding wheel is installed at the middle position of the bottom of the yarn feeder body, and a yarn output bracket is installed at the bottom of the yarn feeder body away from the bracket; an adjustable yarn guiding assembly is installed on the yarn feeder body; the adjustable yarn guiding assembly includes a yarn guide frame and a yarn guiding roller movably installed on the yarn guide frame. This utility model, through the setting of the tension wheel adjustment assembly, can adjust the yarn tension, reduce the probability of machine downtime for maintenance during production, improve production efficiency, reduce the labor intensity of workers, and reduce the number of workers and labor costs.

[0004] However, existing yarn feeders have the following shortcomings in use: 1. The yarn defect filter of the yarn feeder is a perforated positioning plate, which changes the size of the yarn clearing groove by rotating the plate. The yarn defect filter plate only has a few fixed positions and is inconvenient to operate. At the same time, it is large in size and its horizontal setting can easily lead to increased friction between the yarn and the clearing plate, resulting in the accumulation of cotton wool and an unnecessary increase in the number of yarn breaks; 2. The yarn storage wheel of the yarn feeder does not have a yarn storage circle count and cannot automatically and effectively detect whether the yarn is wound. Summary of the Invention

[0005] Therefore, in response to the above problems, this invention proposes an active yarn feeder for a circular knitting machine. The active yarn feeder of this invention can quickly and accurately adjust the yarn defect filter's yarn clearing gap. Its vertical setting makes it less prone to accumulating and clogging cotton fibers, reducing yarn breakage caused by the yarn defect filter's own structural problems. At the same time, it can effectively determine the number of yarn storage turns of the yarn feeder's storage wheel to avoid improper operation of yarn storage and to prevent forgetting to wind yarn. The controller alarm restricts machine startup.

[0006] To solve this technical problem, the present invention adopts the following solution: a positive yarn feeder for a circular knitting machine, comprising a controller, a yarn feeder body, a yarn defect filter, and a drive shaft. The drive shaft is mounted on the yarn feeder body and has a synchronous pulley on it. One end of the drive shaft has a yarn storage wheel. A support frame is provided on one side of the yarn feeder body, and a yarn inlet is provided on the support frame. A ceramic eye yarn outlet is provided on the lower part of the side of the yarn feeder body away from the yarn inlet. The invention also includes a Hall effect sensor and an adjustment seat, the adjustment seat being mounted on the yarn feeder body. Located below the yarn inlet or on one side of the yarn inlet of the yarn storage wheel, the yarn defect filter is mounted on an adjusting seat to clean the yarn fed into the yarn inlet. The adjusting seat can be eccentrically positioned to adjust the position of the yarn defect filter on the yarn feeder body, thereby enabling the yarn cleaning blade of the yarn defect filter to quickly adjust the cleaning gap according to the yarn count. The Hall sensor includes a magnet and a Hall switch. The magnet is located inside the yarn storage wheel, and the Hall switch is located on the yarn storage wheel. The Hall switch detects in real time whether there is yarn wrapped around the yarn storage wheel and sends the information to the controller.

[0007] Furthermore, the adjusting seat includes a rotating shaft and a rotating adjusting wheel. One end of the rotating shaft is rotatably mounted on the yarn feeder body on the yarn feeding side of the yarn storage wheel. The rotating adjusting wheel is rotatably and adjustablely sleeved on the rotating shaft. An eccentric fixed shaft is provided on the end face of the rotating adjusting wheel away from the yarn feeder body. The yarn defect filter is fixed on the eccentric fixed shaft. The rotation of the rotating adjusting wheel drives the yarn defect filter to rotate eccentrically on the yarn feeder body, so that the yarn cleaning knife of the yarn defect filter can quickly adjust the yarn cleaning gap according to the yarn count.

[0008] Furthermore, the yarn defect filter is located on the yarn feeder body and is arranged longitudinally parallel to the yarn storage wheel. The yarn cleaning knife of the yarn defect filter is perpendicular to the yarn fed to the yarn storage wheel to clean the yarn.

[0009] Furthermore, the adjusting seat includes a rotating shaft and a rotating adjusting wheel. One end of the rotating shaft is rotatably mounted on the support frame on the side below the yarn inlet or on the side of the yarn inlet of the yarn storage wheel. The rotating adjusting wheel is rotatably and adjustablely sleeved on the rotating shaft. An eccentric fixed shaft is provided on the end face of the rotating adjusting wheel away from the support frame. The yarn defect filter is fixed on the eccentric fixed shaft. The rotation of the rotating adjusting wheel drives the yarn defect filter to rotate eccentrically on the support frame, so that the yarn cleaning knife of the yarn defect filter can quickly adjust the yarn cleaning gap according to the yarn count.

[0010] Furthermore, the rotating adjusting wheel has an outward protrusion on the side facing the support frame, and the support frame has multiple limiting holes at the corresponding position of the protrusion of the rotating adjusting wheel, which are positioned after the protrusion is rotated.

[0011] Furthermore, the protrusion is hemispherical or arc-shaped.

[0012] Furthermore, it also includes an open-type friction sensor, which is mounted on a support frame to detect in real time whether the yarn supply between the yarn inlet and the yarn storage wheel is interrupted and to send the detection information to the controller.

[0013] Furthermore, it also includes a display, which is located on the yarn feeder body on one side of the yarn storage wheel and is used to display the number of yarn storage loops, the number of yarn breaks, the address number of the yarn feeder, and fault alarm information related to yarn feeding.

[0014] Furthermore, the yarn inlet on the support frame extends upward to form a connector that can be directly inserted into the yarn conduit of the bobbin frame.

[0015] Furthermore, the connector on the yarn inlet of the support frame is a ceramic component.

[0016] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: A yarn defect filter for clearing yarn is installed between the yarn inlet and the yarn storage wheel. The position of the yarn defect filter on the support frame is adjusted by an adjusting seat using eccentric positioning, thereby allowing the yarn clearing blade of the yarn defect filter to quickly adjust the clearing gap according to the yarn count. The adjustment is fast and precise, and it is convenient to use. The filter, located on the support frame below the yarn inlet or on the side of the yarn inlet of the yarn storage wheel, has a compact structure that integrates the yarn inlet method and yarn clearing. The yarn defect filter is set perpendicularly to the yarn to clean yarn knots, effectively reducing friction with the yarn and preventing the accumulation of lint. It is less likely to accumulate and clog lint, reducing yarn breakage caused by the structure of the yarn knot filter itself. A magnet is placed inside the yarn storage wheel, and a Hall effect switch is installed on the PCB board above the yarn storage wheel for Hall effect sensing. The system detects whether there is yarn winding on the yarn storage wheel and sends the information to the controller. By presetting the required number of yarn windings on the controller, the system can effectively determine the number of yarn windings on the yarn feeder's yarn storage wheel, avoiding improper operation and preventing the machine from failing to start if the operator forgets to wind the yarn. The Hall effect sensor detects the yarn and can also effectively detect yarn breakage. An open-type friction sensor is installed between the yarn storage wheel and the yarn inlet. It operates on the piezoelectric principle and is used to monitor the movement of the yarn. The open-type friction sensor is suitable for all types of yarn and its sensitivity is not affected by changes in cotton lint, dust, dirt, and humidity. It can effectively detect whether the yarn supply is broken, achieving multiple accurate detections for yarn breakage. It replaces the mechanical contact yarn probe and avoids the problem of inaccurate yarn breakage detection caused by poor contact of the contact yarn probe. The positive yarn feeder for circular knitting machines provided by this invention solves the problems of inconvenient adjustment of the yarn defect filter clearance gap, reduced yarn breakage due to the accumulation of cotton lint from friction between the yarn and the clearing blade, and the inability to effectively detect whether the yarn storage wheel is wrapped with yarn or whether the operator has forgotten to wrap the yarn. At the same time, it improves the efficiency and safety of the yarn feeder and reduces the difficulty of operation and the cost of use. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram from another angle of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a structural schematic diagram from another angle of Embodiment 2 of the present invention; Figure 5 This is a bottom view structural diagram of Embodiment 2 of the present invention. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Example

[0019] refer to Figures 1-2 The preferred positive yarn feeder for a circular knitting machine of the present invention includes a controller, a yarn feeder body 1, a yarn defect filter 2, a drive shaft 3, a Hall effect sensor 4, an adjusting seat, an open-type friction sensor 7, and a display 8. The drive shaft 3 is mounted on the yarn feeder body 1 and has a synchronous pulley 31. One end of the drive shaft 3 has a yarn storage wheel 6. A support frame 11 is provided on one side of the yarn feeder body 1, and a yarn inlet 12 is provided on the support frame 11. The yarn inlet 12 on the support frame 11 extends upward to form a connector that can be directly inserted into the yarn conduit of the bobbin. The connector on the yarn inlet 12 of the support frame 11 is a ceramic component. The yarn feeder body 1 has a ceramic eye yarn outlet 13 on the lower part of the side away from the yarn inlet 12. The adjusting seat includes a rotating shaft and a rotating adjusting wheel 51. One end of the rotating shaft is rotatably mounted on the yarn feeder body 1 on the yarn inlet side of the yarn storage wheel 6. The rotating adjusting wheel 51 is rotatably and adjustablely sleeved on the rotating shaft. An eccentric fixed shaft is provided on the end face of the rotating adjusting wheel 51 away from the yarn feeder body 1. The yarn defect filter 2 is fixed on the eccentric fixed shaft. The rotation of the rotating adjusting wheel 51 drives the yarn defect filter 2 to rotate eccentrically on the yarn feeder body 1, so that the yarn cleaning knife of the yarn defect filter 2 can quickly adjust the yarn cleaning gap according to the yarn count. Located on the yarn feeder body 1, the yarn defect filter 2 is arranged longitudinally parallel to the yarn storage wheel 6. The yarn cleaning knife of the yarn defect filter 2 is perpendicular to the yarn fed to the yarn storage wheel 6 for yarn cleaning. The Hall sensor 4 includes a magnet and a Hall switch. The magnet is located inside the yarn storage wheel 6. Since the rotating shaft of the yarn defect filter 2, which is mounted on the rotating adjusting wheel 51, is circular, it can effectively reduce friction with the yarn, and the vertical installation can avoid the accumulation of cotton fibers. The Hall switch is located on the yarn storage wheel 6. The Hall switch detects in real time whether there is yarn winding on the yarn storage wheel 6 and sends the information to the controller. The controller presets the required number of yarn windings on the yarn storage wheel 6 and combines it with the Hall sensor. The detection information from the switch can effectively determine whether the number of yarn storage loops of the yarn feeder's storage wheel 6 meets the requirements, control the start and stop of the storage wheel, avoid improper operation of yarn storage, and prevent the operator from forgetting to wind the yarn. The controller alarms and restricts the machine's start. The open-type friction sensor 7 is set on the support frame 11 to detect in real time whether the yarn supply between the yarn inlet 12 and the storage wheel 6 is broken and sends the detection information to the controller. The display 8 is connected to the output terminal of the controller. The display 8 is set on the yarn feeder body 1, located on one side of the storage wheel 6, and is used to display the number of yarn storage loops, the number of yarn breaks, the address number and location of the yarn feeder, and fault alarm information related to yarn delivery. Example

[0020] refer to Figures 3-5The preferred positive yarn feeder for a circular knitting machine of the present invention includes a controller, a yarn feeder body 1', a yarn defect filter 2', a drive shaft 3', a Hall effect sensor 4', an adjustment seat, an open-type friction sensor 7', and a display 8'. The drive shaft 3' is mounted on the yarn feeder body 1' and has a synchronous pulley 31'. One end of the drive shaft 3' has a yarn storage wheel 6'. A support frame 11' is provided on one side of the yarn feeder body 1' and has a yarn inlet 12'. The yarn inlet 12' on the support frame 11' extends upward to be compatible with the yarn bobbin. The yarn conduit is directly plugged into a connector. The connector on the yarn inlet 12' of the support frame 11' is a ceramic component. The lower part of the yarn feeder body 1' on the side away from the yarn inlet 12' has a ceramic eye yarn outlet 13'. The adjusting seat includes a rotating shaft 51' and a rotating adjusting wheel 52'. One end of the rotating shaft 51' is rotatably mounted on the support frame 11' on the side below the yarn inlet 12'. The rotating adjusting wheel 52' is rotatably and adjustablely fitted onto the rotating shaft 51'. An eccentric fixing shaft is provided on the end face of the rotating adjusting wheel 52' away from the support frame 11'. The yarn defect filter 2 The rotating adjusting wheel 52', fixed on an eccentric shaft, drives the yarn defect filter 2' to rotate eccentrically on the support frame 11', causing the yarn clearing knife of the yarn defect filter 2' to quickly adjust the clearing gap according to the yarn count. The Hall sensor 4' includes a magnet and a Hall switch. The magnet is located inside the yarn storage wheel 6', and the Hall switch is located on the yarn storage wheel 6'. The Hall switch detects in real time whether there is yarn winding on the yarn storage wheel 6' and sends the information to the controller. The controller presets the required number of yarn windings on the yarn storage wheel 6', and combined with the detection information of the Hall switch, it can effectively determine the yarn storage wheel of the yarn feeder. The controller alarms to restrict machine startup, ensuring that the number of yarn loops stored in the yarn wheel 6' meets the requirements, preventing improper yarn storage operations and operator forgetting to wind the yarn. The open-type friction sensor 7' is mounted on the support frame 11' to detect in real time whether the yarn supply between the yarn inlet 12' and the yarn storage wheel 6' is interrupted and sends the detection information to the controller. The display 8' is connected to the output of the controller and is located on the yarn feeder body 1' on one side of the yarn storage wheel 6' to display the number of yarn loops stored, the number of yarn breaks, the address number of the yarn feeder, and fault alarm information related to yarn delivery.

[0021] In this invention, the adjusting seat can also be located on the side of the yarn path between the yarn inlet and the yarn storage wheel on the support frame to clean yarn knots. The connection structure between the adjusting seat and the support frame can also be equipped with limiting holes and protrusions to enhance the positioning strength and accuracy of the adjusting seat after adjusting the yarn defect filter. Specifically, an outward protrusion is provided on the side of the rotating adjusting wheel facing the support frame, and the support frame has multiple limiting holes corresponding to the protrusion on the rotating adjusting wheel, which engage with the positioning of the protrusion after rotation. The protrusion can be hemispherical or arc-shaped, etc. In the above embodiment, a display screen is optional.

[0022] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A positive yarn feeder for a circular knitting machine, comprising a controller, a yarn feeder body, a yarn defect filter, and a drive shaft, wherein the drive shaft is mounted on the yarn feeder body and a synchronous pulley is mounted on the drive shaft, a yarn storage wheel is mounted at one end of the drive shaft, a support frame is mounted on one side of the yarn feeder body and a yarn inlet is mounted on the support frame, and a ceramic eye yarn outlet is mounted on the lower part of the side of the yarn feeder body away from the yarn inlet, characterized in that: It also includes a Hall sensor and an adjustment seat. The adjustment seat is located on the yarn feeder body on the side of the yarn inlet of the yarn storage wheel. The yarn defect filter is located on the adjustment seat to clean the yarn fed into the yarn inlet. The adjustment seat can be eccentrically positioned to adjust the position of the yarn defect filter on the yarn feeder body, thereby enabling the yarn cleaning knife of the yarn defect filter to quickly adjust the cleaning gap according to the yarn count. The Hall sensor includes a magnet and a Hall switch. The magnet is located inside the yarn storage wheel, and the Hall switch is located on the yarn storage wheel. The Hall switch detects in real time whether there is yarn wrapped around the yarn storage wheel and sends the yarn storage information to the controller. The adjusting seat includes a rotating shaft and a rotating adjusting wheel. One end of the rotating shaft is rotatably mounted on the yarn feeder body on the yarn feeding side of the yarn storage wheel. The rotating adjusting wheel is rotatably and adjustablely sleeved on the rotating shaft. An eccentric fixed shaft is provided on the end face of the rotating adjusting wheel away from the yarn feeder body. The yarn defect filter is fixed on the eccentric fixed shaft. The rotation of the rotating adjusting wheel drives the yarn defect filter to rotate eccentrically on the yarn feeder body, so that the yarn cleaning knife of the yarn defect filter can quickly adjust the yarn cleaning gap according to the yarn count.

2. The positive yarn feeder for a circular knitting machine according to claim 1, characterized in that: The yarn defect filter is located on the yarn feeder body and is arranged longitudinally parallel to the yarn storage wheel. The yarn cleaning knife of the yarn defect filter is perpendicular to the yarn fed to the yarn storage wheel to clean the yarn.

3. The positive yarn feeder for a circular knitting machine according to claim 1, characterized in that: It also includes an open-type friction sensor, which is mounted on a support frame to detect in real time whether the yarn supply between the yarn inlet and the yarn storage wheel is interrupted and to send the detection information to the controller.

4. The positive yarn feeder for a circular knitting machine according to claim 1, characterized in that: It also includes a display, which is located on the yarn feeder body on one side of the yarn storage wheel and is used to display the number of yarn storage loops, the number of yarn breaks, the address number of the yarn feeder, and fault alarm information related to yarn feeding.

5. The positive yarn feeder for a circular knitting machine according to claim 1, characterized in that: The yarn inlet on the support frame extends upward to form a connector that can be directly inserted into the yarn conduit of the bobbin frame.

6. The positive yarn feeder for a circular knitting machine according to claim 5, characterized in that: The connector on the yarn inlet of the support frame is a ceramic component.

7. A positive yarn feeder for a circular knitting machine, comprising a controller, a yarn feeder body, a yarn defect filter, and a drive shaft, wherein the drive shaft is mounted on the yarn feeder body and a synchronous pulley is mounted on the drive shaft, a yarn storage wheel is mounted at one end of the drive shaft, a support frame is mounted on one side of the yarn feeder body and a yarn inlet is mounted on the support frame, and a ceramic eye yarn outlet is mounted on the lower part of the side of the yarn feeder body away from the yarn inlet, characterized in that: It also includes a Hall sensor and an adjustment seat. The adjustment seat is located on the yarn feeder body below the yarn inlet. The yarn defect filter is located on the adjustment seat to clean the yarn fed into the yarn inlet. The adjustment seat can be eccentrically positioned to adjust the position of the yarn defect filter on the yarn feeder body, thereby enabling the yarn defect filter's cleaning blade to quickly adjust the cleaning gap according to the yarn count. The Hall sensor includes a magnet and a Hall switch. The magnet is located inside the yarn storage wheel, and the Hall switch is located on the yarn storage wheel. The Hall switch detects in real time whether there is yarn winding on the yarn storage wheel and sends the yarn storage information to the controller. The adjusting seat includes a rotating shaft and a rotating adjusting wheel. One end of the rotating shaft is rotatably mounted on the support frame, located on the side below the yarn inlet. The rotating adjusting wheel is rotatably and adjustablely fitted onto the rotating shaft. An eccentric fixed shaft is provided on the end face of the rotating adjusting wheel away from the support frame. The yarn defect filter is fixed on the eccentric fixed shaft. The rotation of the rotating adjusting wheel drives the yarn defect filter to rotate eccentrically on the support frame, so that the yarn cleaning knife of the yarn defect filter can quickly adjust the yarn cleaning gap according to the yarn count.

8. The positive yarn feeder for a circular knitting machine according to claim 7, characterized in that: The rotating adjusting wheel has an outward protrusion on the side facing the support frame, and the support frame has multiple limiting holes at the corresponding position of the protrusion of the rotating adjusting wheel, which are positioned after the protrusion is rotated.

9. The positive yarn feeder for a circular knitting machine according to claim 8, characterized in that: The protrusion is a hemispherical or arc-shaped protrusion.

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