Needle pitch adjusting device of reel foot machine and reel foot machine

Abstract

The utility model provides a stitch length adjusting device of a reel foot machine and the reel foot machine, and belongs to the technical field of sewing equipment. The reel foot machine comprises a machine frame, a needle plate, an upper cloth dragging wheel assembly and a lower cloth dragging wheel are arranged on the machine frame, the needle pitch adjusting device comprises a controller, an installation frame, a connecting rod and a driving piece, the driving piece is installed on the installation frame, one end of the connecting rod is hinged to the installation frame, a presser foot is installed at the other end of the connecting rod, a connecting block is installed on the driving piece, and the connecting block is connected with the controller. The connecting block is hinged to the middle of the connecting rod, a sensor used for detecting whether the connecting block swings or not is installed on the installation frame, and the sensor is electrically connected with the controller. The stitch length adjusting device not only can adjust the reduced stitch length, but also can adjust the increased stitch length, so that the stitch length is kept uniform, and the sewing quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing equipment and relates to a needle distance adjusting device of a sewing machine and the sewing machine. Background Art

[0002] In the roller-foot process of jeans, there is a sewing process from 3 layers to 12 layers and then to 3 layers. Because of the large drop, the stitch length will become smaller when "climbing" from 3 layers to 12 layers, and will become larger when "going downhill" from 12 layers to 3 layers. The feeding structure of the roller-foot machine is quite special. There is no feed dog, only a drag wheel. The drag wheel is slightly behind the needle drop point, so the stitch length is easy to become smaller and larger. This situation occurs within the range of a few stitches after the bone position.

[0003] In the prior art, the iron teeth feeding scheme is generally used to minimize the situation where the needle distance becomes larger, but the problem of the needle distance becoming smaller still cannot be solved. At the same time, the iron teeth have an impact on the fabric and the stitches, which is generally not accepted by high-end customers.

[0004] Regarding the working principle of the cloth conveying mechanism and needle spacing adjustment of the reeling machine, you can refer to the feeding drive structure of the reeling machine provided by application number 201921021291.7. Summary of the invention

[0005] The utility model aims at the above problems existing in the prior art and provides a needle distance adjusting device for a reeling machine. The technical problem to be solved by the utility model is: how to adjust the needle distance.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A needle distance adjustment device for a presser machine, the presser machine comprising a frame, the frame being provided with a needle plate, an upper cloth dragging wheel assembly and a lower cloth dragging wheel, characterized in that the needle distance adjustment device comprises a controller, a mounting frame, a connecting rod and a driving member, the driving member being mounted on the mounting frame, one end of the connecting rod being hinged on the mounting frame, a presser foot being mounted on the other end of the connecting rod, a connecting block being mounted on the driving member, the connecting block being hinged at the middle part of the connecting rod, a sensor for detecting whether the connecting block swings being mounted on the mounting frame, and the sensor being electrically connected to the controller.

[0008] Its working principle is:

[0009] The stitch length adjustment device is installed on the frame of the sewing machine through a mounting bracket. The upper cloth drag wheel assembly is driven by a cloth drag motor. During sewing, the cloth is pressed against the needle plate by the presser foot. Under the drag of the upper cloth drag wheel assembly and the lower cloth drag wheel, the cloth moves forward and is sewn. The connecting block on the driving part is not lifted, the sensor cannot sense any signal, and the sewing machine is in a normal sewing state.

[0010] When the presser foot is in the over-thick rising stage (during the process of the fabric moving forward, the part where the fabric contacts the presser foot changes from thinner to thicker), the presser foot gradually moves upward, the presser foot drives the connecting rod to swing upward, the connecting rod drives the connecting block to swing, and the sensor senses signal a and sends signal a to the controller, and the controller controls the sewing speed of the machine head to appropriately reduce. When the sewing reaches the over-thick rising stage of the upper mopping wheel assembly, the controller controls the speed of the mopping motor relative to the machine head to increase appropriately based on signal a, and the number of stitches increases by 2 or more, thereby compensating for the phenomenon of smaller stitch length caused by "climbing". The mopping motor increases the speed relatively and sews 2 or more stitches and then immediately returns to normal speed.

[0011] When the presser foot is in the over-thickness descending stage (during the process of the fabric moving forward, the part where the fabric contacts the presser foot changes from thicker to thinner), the presser foot gradually moves downward, the connecting rod swings downward, and the connecting rod drives the connecting block to swing. After the sensor senses signal b, it sends signal b to the controller. When the sewing upper mop wheel assembly begins to descend due to excessive thickness, the controller controls the speed of the mop motor relative to the machine head to appropriately reduce the number of stitches based on signal b, and the number of stitches is reduced by 2 stitches or more, thereby compensating for the phenomenon of increased stitch length caused by "downhill". After the mop motor is relatively reduced by 2 stitches or more, the speed of the mop motor immediately returns to normal value. When the thicker part of the fabric completely passes the mop wheel position N stitches (N≥2), the speed of the machine head returns to normal.

[0012] The needle distance adjustment device can adjust the needle distance to be smaller or larger for fabrics with different thicknesses, so that the needle distance is kept uniform and the sewing quality is improved.

[0013] In the above-mentioned stitch length adjustment device of a rolling machine, the connecting block includes a main body, the main body has an extension rod, the extension rod extends toward the sensor and has a gap between the sensor, and the main body is hinged at the middle of the connecting rod.

[0014] The extension rod is closer to the sensor, and when the main body of the connecting block swings, the sensor can more easily sense the swing of the extension rod, thereby improving the sensitivity of the sensing.

[0015] In the above-mentioned stitch length adjustment device of a reeling machine, the upper mopping wheel assembly includes a bracket, on which a mopping wheel lifting and pressing cylinder, a synchronous wheel one and a synchronous wheel two are installed, a swing arm one is hinged on the piston rod of the mopping wheel lifting and pressing cylinder, the middle part of the swing arm one is hinged on the bracket, a synchronous wheel three is installed on one end of the swing arm one, and a synchronous belt is tensionedly connected to the synchronous wheel one, the synchronous wheel two and the synchronous wheel three.

[0016] The cloth is clamped between the synchronous belt and the lower drag wheel. The synchronous wheel one is driven by the drag motor. The synchronous wheels one, two and three drive the synchronous belt to move. The synchronous belt and the lower drag wheel drive the cloth to move forward, and the reeling machine sews the cloth.

[0017] The cloth-lifting and pressing cylinder of the mop wheel drives the swing rod 1 to swing up and down, and the pressing degree and pressure value of the synchronous belt on the cloth can be adjusted by adjusting the angle of the swing rod 1.

[0018] When the upper mop wheel assembly starts to drop due to excessive thickness, the controller controls the speed of the mop motor relative to the machine head to appropriately reduce the number of stitches based on signal b, and the number of stitches is reduced by 2 or more. At the same time, the pressure value of the mop wheel lifting and pressing cylinder is appropriately reduced, which can better compensate for the phenomenon of increased stitch length caused by "downhill". After the mop motor is relatively reduced by 2 or more stitches, the pressure value of the mop wheel lifting and pressing cylinder and the speed of the mop motor immediately return to normal values.

[0019] In the above-mentioned stitch length adjustment device of a rolling machine, a rocker arm 2 is hinged on the bracket, a pressure wheel is installed on one end of the rocker arm 2, a bolt is threadedly connected to the middle part of the rocker arm 2, and the bolt is threadedly connected to the bracket. A spring is sleeved on the screw rod of the bolt, and the spring is in a compressed state and causes the pressure wheel to be pressed against the synchronous belt.

[0020] The compressed spring generates thrust, causing the clamping wheel on the second swing arm to clamp the synchronous belt, so that the synchronous belt can be in closer contact with the three synchronous wheels, preventing the synchronous belt from slipping and better dragging the cloth to move.

[0021] By rotating the bolt, the degree of compression of the spring can be adjusted, thereby adjusting the pressing force of the clamping wheel on the synchronous belt, and the tension of the synchronous belt can be adjusted as needed, with good adaptability.

[0022] In the above-mentioned needle distance adjustment device of a rolling machine, the sensor is a normally open sensor.

[0023] In the above-mentioned needle distance adjustment device of a presser foot machine, the driving member comprises a presser foot cylinder, and the connecting block is mounted on the piston rod of the presser foot cylinder.

[0024] The utility model also provides a needle-rolling machine, which comprises any one of the needle-length adjusting devices mentioned above.

[0025] Compared with the prior art, the advantages of the utility model are as follows:

[0026] 1. The needle distance adjustment device can adjust the needle distance to a smaller size or a larger size for fabrics of different thicknesses, so that the needle distance remains uniform and the sewing quality is improved.

[0027] 2. The cloth-lifting and pressure cylinder of the mop wheel of the needle-length adjustment device drives the swing rod 1 to swing up and down. By adjusting the angle of the swing rod 1, the degree of compression and pressure value of the synchronous belt on the cloth can be adjusted, which can better compensate for the increase in needle length caused by "downhill". BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the needle distance adjustment device;

[0029] Figure 2 It is a structural schematic diagram of the needle distance adjustment device from another perspective;

[0030] Figure 3 It is a schematic diagram of the needle distance adjustment device installed on the frame.

[0031] In the figure: 1 frame, 2 needle plate, 3 upper mop wheel assembly, 4 lower mop wheel, 5 mounting frame, 6 connecting rod, 7 presser foot cylinder, 8 presser foot, 9 connecting block, 10 sensor, 11 main body, 12 extension rod, 13 bracket, 14 mop wheel lifting and pressing cylinder, 15 synchronous wheel one, 16 synchronous wheel two, 17 swing rod one, 18 synchronous wheel three, 19 synchronous belt, 20 swing rod two, 21 clamping wheel, 22 bolts, 23 springs, 24 cloth. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0033] like Figure 1-3 As shown, the foot-rolling machine includes a frame 1, on which a needle plate 2, an upper mopping wheel assembly 3 and a lower mopping wheel 4 are arranged, and a stitch length adjustment device includes a controller, a mounting frame 5, a connecting rod 6 and a driving member, the driving member is mounted on the mounting frame 5, one end of the connecting rod 6 is hinged on the mounting frame 5, a presser foot 8 is mounted on the other end of the connecting rod 6, a connecting block 9 is mounted on the driving member, the connecting block 9 is hinged at the middle of the connecting rod 6, a sensor 10 for detecting whether the connecting block 9 swings is mounted on the mounting frame 5, and the sensor 10 is electrically connected to the controller. As an embodiment, the sensor 10 is a normally open sensor 10.

[0034] As an embodiment, the driving member comprises a presser foot cylinder 7, and a connecting block 9 is installed on the piston rod of the presser foot cylinder 7. In addition, the presser foot cylinder 7 can also be replaced by an oil cylinder or a linear motor.

[0035] The stitch length adjustment device is installed on the frame 1 of the sewing machine through the mounting frame 5. The upper cloth-dragging wheel assembly 3 is driven by the cloth-dragging motor. During sewing, the cloth 24 is pressed on the needle plate 2 by the presser foot 8. Under the dragging of the upper cloth-dragging wheel assembly 3 and the lower cloth-dragging wheel 4, the cloth 24 moves forward and is sewn. The connecting block 9 on the driving part is not lifted, and the sensor 10 cannot sense any signal, and the sewing machine is in a normal sewing state.

[0036] When the presser foot 8 is in the over-thick rising stage (during the process of the cloth 24 moving forward, the part where the cloth 24 contacts the presser foot 8 changes from thinner to thicker), the presser foot 8 gradually moves upward, and the presser foot 8 drives the connecting rod 6 to swing upward, and the connecting rod 6 drives the connecting block 9 to swing. After the sensor 10 senses the signal a, it sends the signal a to the controller, and the controller controls the sewing speed of the machine head to appropriately reduce. When the sewing reaches the over-thick rising stage of the upper mopping wheel assembly 3, the controller controls the speed of the mopping motor relative to the machine head to increase appropriately based on the signal a, and the number of stitches increases by 2 stitches or more, thereby compensating for the phenomenon of the reduced stitch length caused by "climbing". After the mopping motor relatively increases the speed to sew 2 stitches or more, it immediately returns to normal speed.

[0037] When the presser foot 8 is in the over-thick descending stage (during the process of the cloth 24 moving forward, the part where the cloth 24 contacts the presser foot 8 changes from thicker to thinner), the presser foot 8 gradually moves downward, the connecting rod 6 swings downward, and the connecting rod 6 drives the connecting block 9 to swing. After the sensor 10 senses the signal b, it sends the signal b to the controller. When the sewing to the upper mopping wheel assembly 3 begins to descend due to excessive thickness, the controller controls the speed of the mopping motor relative to the machine head to appropriately reduce the number of stitches based on the signal b, and the number of stitches is reduced by 2 stitches or more. At the same time, the pressure value of the mopping wheel lifting and pressing cylinder 14 is appropriately reduced to compensate for the phenomenon of increased stitch length due to "downhill". After the mopping motor is relatively reduced by 2 stitches or more, the pressure value of the mopping wheel lifting and pressing cylinder 14 and the speed of the mopping motor immediately return to normal values. After the thicker position of the cloth 24 completely passes the mopping wheel position N stitches (N≥2), the speed of the machine head returns to normal.

[0038] like Figure 1 As shown, in this embodiment, the connecting block 9 includes a main body 11, and an extension rod 12 is provided on the main body 11. The extension rod 12 extends toward the sensor 10 and is spaced apart from the sensor 10. The main body 11 is hinged at the middle of the connecting rod 6.

[0039] The extension rod 12 is closer to the sensor 10. When the main body 11 of the connecting block 9 swings, the sensor 10 can more easily sense the swing of the extension rod 12, thereby improving the sensitivity of the sensing.

[0040] like Figure 1 and 2As shown, in this embodiment, the upper mop wheel assembly 3 includes a bracket 13, on which a mop wheel lifting and pressing cylinder 14, a synchronous wheel 15 and a synchronous wheel 2 16 are installed, a swing rod 17 is hinged on the piston rod of the mop wheel lifting and pressing cylinder 14, the middle part of the swing rod 17 is hinged on the bracket 13, a synchronous wheel 3 18 is installed on one end of the swing rod 17, and a synchronous belt 19 is tensionedly connected to the synchronous wheel 15, the synchronous wheel 2 16 and the synchronous wheel 3 18.

[0041] The cloth 24 is clamped between the synchronous belt 19 and the lower mopping wheel 4. The synchronous wheel 15 is driven by the mopping motor. The synchronous wheel 15, the synchronous wheel 2 16 and the synchronous wheel 3 18 drive the synchronous belt 19 to move. The synchronous belt 19 and the lower mopping wheel 4 drive the cloth 24 to move forward, and the reeling machine sews the cloth 24.

[0042] The cloth-mopping wheel lifting and pressing cylinder 14 drives the swing rod 17 to swing up and down, and the pressing degree and pressure value of the synchronous belt 19 on the cloth 24 are adjusted by adjusting the angle of the swing rod 17.

[0043] When the upper mop wheel assembly 3 starts to drop due to excessive thickness during sewing, the controller controls the speed of the mop motor relative to the machine head to appropriately reduce the number of stitches based on signal b, and the number of stitches is reduced by 2. At the same time, the pressure value of the mop wheel lifting cylinder 14 is appropriately reduced, which can better compensate for the increase in stitch length caused by "downhill".

[0044] like Figure 2 As shown, in this embodiment, a rocker arm 20 is hinged on the bracket 13, a clamping wheel 21 is installed on one end of the rocker arm 20, a bolt 22 is threadedly connected to the middle part of the rocker arm 20, the bolt 22 is threadedly connected to the bracket 13, a spring 23 is sleeved on the screw rod of the bolt 22, the spring 23 is in a compressed state and causes the clamping wheel 21 to be pressed against the synchronous belt 19.

[0045] The compressed spring 23 generates thrust, so that the clamping wheel 21 on the swing rod 20 clamps the synchronous belt 19, so that the synchronous belt 19 can be in closer contact with the three synchronous wheels, preventing the synchronous belt 19 from slipping and better dragging the cloth 24 to move.

[0046] By rotating the bolt 22, the degree of compression of the spring 23 can be adjusted, thereby adjusting the pressing force of the clamping wheel 21 on the synchronous belt 19, and adjusting the tension of the synchronous belt 19 as needed, with good adaptability.

[0047] The utility model also provides a needle-rolling machine, which comprises any one of the needle-length adjusting devices mentioned above.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A needle distance adjustment device for a weaving machine, the weaving machine comprising a frame (1), a needle plate (2), an upper cloth-pulling wheel assembly (3) and a lower cloth-pulling wheel (4) being arranged on the frame (1), characterized in that: The stitch length adjustment device comprises a controller, a mounting frame (5), a connecting rod (6) and a driving member, wherein the driving member is mounted on the mounting frame (5), one end of the connecting rod (6) is hinged on the mounting frame (5), a presser foot (8) is mounted on the other end of the connecting rod (6), a connecting block (9) is mounted on the driving member, the connecting block (9) is hinged on the middle part of the connecting rod (6), the mounting frame (5) is mounted with a sensor (10) for detecting whether the connecting block (9) swings, and the sensor (10) is electrically connected to the controller.

2. The needle distance adjustment device of a rolling machine according to claim 1, characterized in that: The connecting block (9) comprises a main body (11), the main body (11) is provided with an extension rod (12), the extension rod (12) extends in the direction of the sensor (10) and is spaced apart from the sensor (10), and the main body (11) is hinged at the middle of the connecting rod (6).

3. The needle distance adjustment device of a rolling machine according to claim 1 or 2, characterized in that: The upper mopping wheel assembly (3) comprises a bracket (13), on which a mopping wheel lifting and pressing cylinder (14), a synchronous wheel one (15) and a synchronous wheel two (16) are mounted, a piston rod of the mopping wheel lifting and pressing cylinder (14) is hingedly connected to a swing rod one (17), the middle part of the swing rod one (17) is hingedly connected to the bracket (13), a synchronous wheel three (18) is mounted on one end of the swing rod one (17), and a synchronous belt (19) is tensionedly connected to the synchronous wheel one (15), the synchronous wheel two (16) and the synchronous wheel three (18).

4. The needle distance adjustment device of a rolling machine according to claim 3, characterized in that: A second swing arm (20) is hinged on the bracket (13), a clamping wheel (21) is installed on one end of the second swing arm (20), a bolt (22) is threadedly connected to the middle part of the second swing arm (20), the bolt (22) is threadedly connected to the bracket (13), a spring (23) is sleeved on the screw rod of the bolt (22), the spring (23) is in a compressed state and causes the clamping wheel (21) to be pressed against the synchronous belt (19).

5. The needle distance adjustment device of a rolling machine according to claim 1 or 2, characterized in that: The sensor (10) is a normally open sensor.

6. The needle distance adjustment device of a rolling machine according to claim 1 or 2, characterized in that: The driving member comprises a presser foot cylinder (7), and the connecting block (9) is mounted on the piston rod of the presser foot cylinder (7).

7. A rolling machine, characterized in that: The needle-rolling machine comprises a needle distance adjustment device as described in any one of claims 1-6.

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