Bottom line detection device

Abstract

The utility model provides a bottom thread detection device which comprises a rotating shuttle installed below a needle plate, the rotating shuttle comprises a shuttle core for installing a bottom thread, and a plurality of reflecting surfaces and non-reflecting surfaces which are alternately arranged are evenly distributed on the end face of the shuttle core in the rotating direction of the shuttle core. And the needle plate is provided with a detector which is matched with the reflecting surface and the non-reflecting surface of the end surface of the shuttle peg to provide receiving and transmitting signals so as to detect whether the shuttle peg rotates or not. Whether the shuttle peg rotates or not is judged according to the signals received by the detector, namely whether the bottom thread is broken or exhausted or not, the bottom thread can be supplemented in time, empty seams are reduced, and sewing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of sewing and embroidery technology, and in particular to a bottom line detection device. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, interweaving or sewing together one or more layers of fabric. Currently, sewing machines, embroidery machines, and similar machines mostly use lockstitch, a sewing device where a rotary hook and needle work together to interlock the top and bottom threads within the fabric, achieving a lockstitch. The top thread is threaded through the eye of the needle, which moves up and down; the bobbin of the rotary hook is housed in the bobbin case, and the bottom thread is wound around the bobbin. The top thread is above the fabric and is quite long, generally reaching several kilometers, requiring infrequent replacement; the operator can visually observe whether the top thread needs changing. The bottom thread is located inside the rotary hook below the fabric, not visible to the operator, and the bobbin holding the bottom thread has a small thread capacity, generally only tens of meters, with larger bobbins reaching around 100 meters, requiring frequent replacement.

[0003] Therefore, operators must frequently observe whether the bobbin thread is exhausted or broken. If this is not detected in time, it will result in gaps in the fabric, or even damage the fabric, causing it to be scrapped. Moreover, it will be necessary to reinstall bobbin thread and repair the seam, which will affect the sewing quality and reduce production efficiency. Utility Model Content

[0004] To address the problems of the prior art, this invention provides a bobbin thread detection device that uses a detector to check whether the rotary hook is rotating in order to determine whether the bobbin thread is exhausted or broken. This allows for timely replacement of the bobbin thread, improving efficiency and reducing gaps.

[0005] The technical solution adopted is as follows:

[0006] A bobbin thread detection device includes a rotary hook installed below a needle plate. The rotary hook includes a bobbin for mounting the bobbin thread. One or both ends of the bobbin have a plurality of alternately arranged reflective and non-reflective surfaces evenly distributed along its rotation direction. The needle plate is provided with a detector that cooperates with the reflective and non-reflective surfaces of the bobbin end face to provide signal transmission and reception and detect whether the bobbin is rotating.

[0007] Furthermore, the end face of the bobbin has several spaced circular grooves evenly distributed along its rotation direction, and the circular grooves are located on the end face of the bobbin facing the detector.

[0008] Furthermore, the reflective surface can be located within all the circular grooves, and the non-reflective surface is the spacer surface between adjacent circular grooves.

[0009] Furthermore, the reflective and non-reflective surfaces are alternately arranged within the circular groove.

[0010] Furthermore, the detector includes a transmitter that emits a laser and a receiver that detects whether the laser is reflected.

[0011] Furthermore, a transmission path is provided between the detector and the shuttle core; a reflection path is provided between the shuttle core and the receiver.

[0012] Furthermore, the transmitter and receiver are set at a certain angle, with the apex of the angle located at the path of the reflective or non-reflective surface.

[0013] Furthermore, after being reflected by the reflective surface, the laser emitted by the transmitter returns to the receiver through the reflection path.

[0014] Furthermore, the needle plate is also provided with a drive structure for driving the rotary hook to rotate.

[0015] Furthermore, the rotary shuttle also includes a shuttle case fitted over the shuttle core and a rotary shuttle frame for mounting the shuttle case, with the rotary shuttle frame mounted on the drive structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a bobbin thread detection device, comprising a bobbin with bobbin thread installed and a detector mounted on a needle plate. One end face or one side of both ends of the bobbin has alternating reflective and non-reflective surfaces. When the bobbin rotates, the detector receives alternating reflected and non-reflective signals by transmitting and receiving signals. When the bobbin stops rotating, the detector receives only one type of reflected signal (either reflected or non-reflective), thus determining whether the bobbin has stopped rotating, i.e., whether the bobbin thread has broken or run out. The device can replenish bobbin thread promptly based on the detector's signal, reducing empty seams and improving sewing efficiency. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the present invention from one angle;

[0019] Figure 2 This is a partial structural diagram of the side of this utility model;

[0020] Figure 3 This is a structural schematic diagram of the present invention from another angle;

[0021] Among them, needle plate 1, rotary shuttle 2, shuttle core 201, shuttle shell 202, rotary shuttle frame 203, detector 3, transmitter 301, receiver 302, circular groove 4, drive structure 5, transmission path 6, and reflection path 7. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] refer to Figure 1 , 2 3. A bottom thread detection device, comprising a rotary hook 2 installed below a needle plate 1, wherein the rotary hook 2 comprises a bobbin 201 for mounting the bottom thread, wherein a plurality of alternately arranged reflective and non-reflective surfaces are evenly distributed on one or both ends of the bobbin 201 along its rotation direction, and the needle plate 1 is provided with a detector 3 for detecting whether the bobbin 201 is rotating.

[0024] The end face of the bobbin 201 is evenly distributed with a number of spaced circular grooves 4 along its rotation direction. The circular grooves 4 are located on the edge of the end face of the bobbin facing the detector 3.

[0025] In one embodiment, the reflective surface can be located within all the circular grooves 4, and the non-reflective surface is the spacer surface between adjacent circular grooves.

[0026] In another implementation, the reflective and non-reflective surfaces are alternately arranged within the circular groove. It is necessary to ensure that when the bobbin rotates, the detector 3 can detect alternating signals of transmitted and non-transmitted signals, while when the bobbin is not rotating, the detector 3 detects only one signal. This method is used to determine whether the bobbin is rotating, thereby determining whether the bottom thread is exhausted or broken.

[0027] The detector 3 includes a laser emitter 301 that emits laser light and a receiver 302 that detects whether the laser light is reflected. A transmission path 6 is provided between the detector 3 and the bobbin 201; a reflection path 7 is provided between the bobbin 201 and the receiver 302. The emitter 301 and the receiver 302 can be arranged at a certain angle, with the apex of the angle located at the path between the reflecting and non-reflecting surfaces. The laser light emitted by the emitter 301 can fall precisely onto the reflecting or non-reflecting surface through the transmission path 6. After reflection by the reflecting surface, the laser light emitted by the emitter returns to the receiver 302 through the reflection path 7. If the laser light falls into the reflecting surface, after reflection by the reflecting surface, the laser light returns to the receiver 302 through the reflection path 7.

[0028] The transmitter 301 emits a laser beam to the edge of the bobbin 201 (the edge surface with a emitting surface and a non-reflective surface). The transmitter 301 emits the laser beam through the emission path 6. As the bobbin 201 rotates, the emitting and non-reflective surfaces on the bobbin 201 also rotate. When the laser beam passes through the reflective surface, it returns to the receiver 302 through the reflection path 7 and is detected by the receiver 302. When the laser beam passes through the non-reflective surface or the gap between the reflective and non-reflective surfaces, the laser beam is not reflected, and the receiver 302 does not receive a reflected signal. Because the reflective and non-reflective surfaces are alternately arranged, the receiver 302 will alternately receive reflected and non-reflected signals when the bobbin 201 rotates. If the bobbin 201 stops rotating, the receiver 302 will only receive either a reflected signal or a non-reflected signal. The receiver 302 uses this method to determine whether the bobbin 201 is rotating.

[0029] When the bobbin thread runs out or breaks, the bobbin 201 will stop rotating. At this time, the receiver 302 can determine the status of the bobbin thread based on the changes in the received signal, so as to add or replace the bobbin thread in time, stop sewing in time, reduce the phenomenon of empty sewing, reduce the loss of time and cost, and make sewing efficiency higher.

[0030] The rotary shuttle 2 also includes a shuttle case 202 sleeved outside the shuttle core 201 and a rotary shuttle frame 203 for mounting the shuttle case 202. The rotary shuttle frame 203 is mounted on the drive structure 5.

[0031] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A bobbin thread detection device, comprising a rotary hook (2) mounted below a needle plate (1), said rotary hook (2) comprising a bobbin (201) for mounting the bobbin thread, characterized in that: The bobbin (201) has several alternating reflective and non-reflective surfaces evenly distributed on one or both ends along its rotation direction. The needle plate (1) is equipped with a detector (3) that works in conjunction with the reflective and non-reflective surfaces of the bobbin end face to provide signal transmission and reception and detect whether the bobbin (201) is rotating.

2. The bottom line detection device as described in claim 1, characterized in that: The end face of the bobbin (201) is evenly distributed with several spaced circular grooves (4) along its rotation direction. The circular grooves (4) are located on the end face of the bobbin facing the detector (3).

3. The bottom line detection device as described in claim 2, characterized in that: The reflective surface can be located in all the circular grooves, and the non-reflective surface is the spacer surface between adjacent circular grooves.

4. The bottom line detection device as described in claim 2, characterized in that: The reflective and non-reflective surfaces are alternately arranged in the circular groove (4).

5. The bottom line detection device as described in claim 1, characterized in that: The detector (3) includes a transmitter (301) that emits laser light and a receiver (302) that detects whether the laser light is reflected.

6. The bottom line detection device as described in claim 5, characterized in that: A transmission path (6) is provided between the transmitter (301) and the spindle (201); a reflection path (7) is provided between the spindle (201) and the receiver (302).

7. The bottom line detection device as described in claim 5, characterized in that: The transmitter (301) and receiver (302) are set at a certain angle, with the apex of the angle located at the path of the reflective or non-reflective surface.

8. The bottom line detection device as described in claim 6, characterized in that: After being reflected by the reflective surface, the laser emitted by the transmitter returns to the receiver (302) through the reflection path (7).

9. The bottom line detection device as described in claim 1, characterized in that: The needle plate is also provided with a drive structure (5) for driving the rotary hook (2) to rotate.

10. The bottom line detection device as described in claim 5, characterized in that: The rotary shuttle (2) also includes a shuttle case (202) sleeved outside the shuttle core (201) and a rotary shuttle frame (203) for mounting the shuttle case (202), with the rotary shuttle frame (203) mounted on the drive structure (5).

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