Anti-needle-collision structure of multi-needle machine

Abstract

The utility model provides an anti-needle-collision structure of a multi-needle machine, belongs to the technical field of multi-needle machines, and solves the problem that the existing operation error-tolerant rate is lower. The needle collision prevention structure of the multi-needle machine and the multi-needle machine comprise a curved needle seat and are characterized in that the needle collision prevention structure comprises a rack and a protective shell, the protective shell protrudes out of the side face of the curved needle seat, a bottom plate of the rack protrudes upwards to form a limiting boss, the limiting boss is located below the curved needle seat, the curved needle seat can turn over on the rack, and when the curved needle seat turns over downwards, the limiting boss is located below the curved needle seat. The protective shell abuts against the limiting boss for limiting so that the curved needle base can stop turning over. According to the needle collision prevention structure of the multi-needle machine, the operation error-tolerant rate is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-needle machines and relates to an anti-collision needle structure of a multi-needle machine. Background Art

[0002] There are various types of multi-needle machines, which are widely used in decorative sewing. A number of curved needles are installed on the multi-needle machine, and the number of curved needles is the same as that of the machine needles. The existing installation structure of the multi-needle machine includes a curved needle holder. The curved needle base is fixed on the curved needle holder. The machine needle pierces the cloth with the surface thread, and the curved needle brings the bottom thread to form a stitch after threading the surface thread.

[0003] During sewing, thread breakage is inevitable. Since there is a thread dialing mechanism in front of the curved needle to block, it is difficult to smoothly thread the bottom thread into the curved needle hole within the normal movement range of the curved needle. Therefore, the multi-needle machine is provided with a curved needle ejection mechanism. The curved needle ejection mechanism is a mechanism that controls the separation or connection between the curved needle holder and the swing shaft, so that the curved needle holder moves out of the normal movement range under the action of the spring force and tilts forward to an unobstructed space. At this time, the bottom thread can be easily threaded into the curved needle hole. However, when the multi-needle machine is in a normal working state, the machine needle is below the needle plate. At this time, if the curved needle is ejected, it will hit the machine needle and cause the needle to break.

[0004] For this reason, the Chinese patent application (application number: 200620041518.0) discloses an anti-collision needle protection device for a multi-needle machine, which is characterized in that a swing shaft stop rod fixed on the swing shaft and a shift fork shaft stop rod fixed on the shift fork shaft are arranged opposite to each other, and the swing shaft stop rod is located on the left side of the shift fork shaft stop rod. The swing shaft stop rod is composed of a swing shaft retaining ring and a swing shaft long pin. The swing shaft retaining ring is radially provided with a pin hole and a screw hole. The swing shaft long pin is fixedly inserted into the pin hole, and a screw is inserted into the screw hole to abut against the swing shaft to fix the swing shaft retaining ring. The shift fork shaft stop rod is composed of a shift fork shaft retaining ring and a shift fork shaft long pin. The shift fork shaft is radially provided with a pin hole and a screw hole. The shift fork shaft long pin and the swing shaft long pin are fixedly inserted into the pin hole, and a screw is inserted into the screw hole to abut against the shift fork shaft to fix the shift fork shaft retaining ring.

[0005] However, the above method has the following defects: The swing shaft stop rod rotates with the swing of the swing shaft, and the shift fork shaft stop rod rotates with the swing of the shift fork shaft. The radial positions of the swing shaft retaining ring and the shift fork shaft retaining ring are adjusted to control whether the curved needle base can be ejected. When the multi-needle machine is working normally, the machine needle is below the needle plate. If the operator makes a wrong operation and adjusts the radial positions of the swing shaft retaining ring and the shift fork shaft retaining ring so that the swing shaft stop rod and the shift fork shaft stop rod are staggered from each other and do not interfere with each other, pulling the shift fork shaft at this time will cause the curved needle holder to eject and hit the machine needle, resulting in a broken needle, and the operation error tolerance rate is relatively low. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an anti-collision needle structure for a multi-needle machine in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is: how to improve the operation error tolerance rate.

[0007] The object of the present utility model can be achieved by the following technical solutions: An anti-collision needle structure for a multi-needle machine. The multi-needle machine includes a curved needle base. It is characterized in that the anti-collision needle structure includes a machine frame and a protective shell. The protective shell protrudes from the side of the curved needle base. The bottom plate of the machine frame protrudes upward to form a limiting boss. The limiting boss is located below the curved needle base. The curved needle base can be flipped on the machine frame. When the curved needle base is flipped downward, the protective shell abuts against the limiting boss for limiting to stop the flipping of the curved needle base.

[0008] In actual work, the curved needle base is flipped downward until the protective shell abuts against the limiting boss to stop the flipping of the curved needle base. At this time, the curved needle base moves to a space without obstacles, and personnel can easily thread the bobbin thread into the curved needle hole to complete the thread changing operation. Whether the machine needle is above or below the needle plate, when the curved needle base is flipped downward, the abutment of the protective shell and the limiting boss can be used to limit the flipping angle, avoiding hitting the machine needle and causing the needle to break, and improving the fault tolerance rate of the operation. The bottom plate of the machine frame protrudes upward to form a limiting boss, and the limiting boss is integrally formed with the machine frame body, which is convenient for processing. The setting of the protective shell prevents direct collision between the curved needle base and the limiting boss and causes damage. When the protective shell abuts against the limiting boss for limiting, an operating space is left between the curved needle base and the limiting boss, which is beneficial to ensuring the smoothness of the thread changing operation.

[0009] For the above anti-collision needle structure of the multi-needle machine, the limiting boss extends to the edge of the machine frame and the upper surface of the limiting boss is a plane. The limiting boss can be integrally formed with the bottom plate of the machine frame, which is convenient for production. The upper surface of the limiting boss is a plane and extends to the edge of the machine frame, which is beneficial to ensuring stable and reliable abutment and limiting between the protective shell and the limiting boss.

[0010] For the above anti-collision needle structure of the multi-needle machine, the surface of the protective shell is a smooth arc surface. The protective shell abuts against the limiting boss with an arc surface. The arc surface can bear a greater impact force relative to a plane, and the smooth arc surface is beneficial to increasing the contact area, which is beneficial to ensuring stable and reliable abutment and limiting between the protective shell and the limiting boss.

[0011] For the above anti-collision needle structure of the multi-needle machine, several convex blocks protrude from the side of the curved needle base. Through holes are provided on the convex blocks, and a push pin is inserted through the through holes. The push pin can drive the curved needle base to move in the same direction, and the protective shell is wrapped outside the convex blocks. The push pin is inserted through the through holes on the convex blocks to drive the curved needle base to move, and the protective shell is wrapped outside the convex blocks, and the protective shell protects the push pin from being affected by impact.

[0012] The anti-needle-collision structure of the above multi-needle machine. A swing shaft is provided on the frame, and a crank is fastened to the swing shaft. A torsion spring is provided on the swing shaft. The bent-needle seat is in clearance fit with the swing shaft, and the bent-needle seat is turned downward by the acting force of the torsion spring. The elastic energy stored per unit volume of the torsion spring is relatively large, which is beneficial to realizing a compact design of this anti-needle-collision structure. The stability of the torsion spring is relatively high. Even under the conditions of impact and vibration, its characteristics are relatively stable, which is beneficial to ensuring the stable operation of this anti-needle-collision structure.

[0013] The anti-needle-collision structure of the above multi-needle machine. A stepped portion is formed by the downward depression of the upper surface of the crank, and at least one side of the crank is gradually inclined outward from top to bottom to form a relief portion. The stepped portion and the relief portion are smoothly transitioned. When the bent-needle seat is away from the crank, both ends of the torsion spring are respectively abutted against the stepped portion and the bent-needle seat to turn the bent-needle seat downward. When the bent-needle seat is turned upward, one end of the torsion spring is located at the relief portion. When the bent-needle seat is away from the crank, the torsion spring is in an unlocked state. Both ends of the torsion spring are respectively abutted against the stepped portion and the bent-needle seat to turn the bent-needle seat downward. When the bent-needle seat moves to a space without obstacles, the operator can easily thread the bobbin thread into the bent-needle hole to complete the thread-changing operation. After the thread-changing is completed, push the bent-needle seat upward. The bent-needle seat is turned upward, and the torsion spring is in a locked state. One end of the torsion spring is located at the bent-needle seat, and the other end is located at the relief portion, and it is impossible to apply a force to turn the bent-needle seat downward.

[0014] The anti-needle-collision structure of the above multi-needle machine. A fork shaft and a fork are further provided on the frame. Two ends of the fork are respectively connected to the fork shaft and a push rod. The crank is provided with a tapered hole. The fork shaft can drive the fork to make the push rod cooperate with or separate from the tapered hole. When the push rod is separated from the tapered hole, the bent-needle seat is turned downward by the acting force of the torsion spring. When the fork shaft moves away from the crankshaft, the fork drives the push rod to separate from the tapered hole, and the push rod no longer applies pressure to the bent-needle seat. The bent-needle seat does not squeeze the torsion spring, and the torsion spring is in an unlocked state. Both ends of the torsion spring are respectively abutted against the stepped portion and the bent-needle seat to turn the bent-needle seat downward. When the bent-needle seat moves to a space without obstacles, the operator can easily thread the bobbin thread into the bent-needle hole to complete the thread-changing operation. After the thread-changing is completed, push the bent-needle seat upward. The bent-needle seat is turned upward, the push rod moves close to the crank and cooperates with the tapered hole, and the bent-needle seat is reset.

[0015] The anti-needle-collision structure of the above multi-needle machine, the bump includes bump one and bump two, the fork is provided with spring one and spring two, both ends of spring one are respectively in tight contact with the end of the push rod and bump one. When the bent needle seat flips upward, both ends of spring two are respectively in tight contact with the fork and bump two. Under the thrust of the spring, the push rod cooperates with the tapered hole to reset the bent needle seat. The setting of spring one makes the fork always close to the end of the push rod. When the fork shaft moves away from the crankshaft, the fork drives the push rod to separate from the tapered hole, and spring two is in a relaxed state and does not apply pressure to bump two. The bent needle seat does not squeeze the torsion spring, and the torsion spring is in an unlocked state. Both ends of the torsion spring are respectively in tight contact with the stepped portion and the bent needle seat to make the bent needle seat flip downward. The bent needle seat moves to a space without obstacles, and personnel can easily thread the bobbin thread into the bent needle hole to complete the thread-changing operation. After the thread-changing is completed, push the bent needle seat upward. The bent needle seat flips upward. Under the thrust of spring two, the chasing pin cooperates with the tapered hole to reset the bent needle frame.

[0016] Compared with the prior art, the anti-needle-collision structure of this multi-needle machine has the following advantages:

[0017] 1. In the anti-needle-collision structure of this multi-needle machine, whether the sewing needle is above or below the needle plate, when the bent needle seat flips downward, the flipping angle can be limited by the abutment of the protective shell and the limiting boss, avoiding hitting the sewing needle and causing the needle to break, and improving the fault tolerance rate of the operation.

[0018] 2. In the anti-needle-collision structure of this multi-needle machine, the bottom plate of the machine frame protrudes upward to form a limiting boss, and the limiting boss is integrally formed with the machine frame body, which is convenient for processing.

[0019] 3. In the anti-needle-collision structure of this multi-needle machine, the setting of the protective shell prevents direct collision between the bent needle seat and the limiting boss from causing damage. When the protective shell abuts against the limiting boss for limiting, an operating space is left for personnel between the bent needle seat and the limiting boss, which is beneficial to ensuring the smoothness of the thread-changing operation. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the normal working state of this multi-needle machine Figure 1 .

[0021] Figure 2 is a schematic diagram of the normal working state of this multi-needle machine Figure 2 .

[0022] Figure 3 is Figure 2 the cross-sectional view along the A-A direction in

[0023] Figure 4 is a schematic diagram of the state when the bent needle seat flips downward Figure 1 .

[0024] Figure 5 is a schematic diagram of the state when the bent needle seat flips downward Figure 2 .

[0025] Figure 6 is Figure 5 The sectional view along the B - B direction in

[0026] Figure 7 is Figure 5 The sectional view along the C - C direction in

[0027] Figure 8 It is a schematic diagram of the frame of the anti - collision needle structure of this multi - needle machine.

[0028] Figure 9 It is a schematic diagram of the bent needle base of the anti - collision needle structure of this multi - needle machine.

[0029] Figure 10 It is a schematic diagram of the bending handle of the anti - collision needle structure of this multi - needle machine.

[0030] In the figure, 1 is the bent needle base; 1a is the convex block; 1a1 is the first convex block; 1a2 is the second convex block; 1b is the through - hole; 2 is the frame; 2a is the limit convex platform; 3 is the protective shell; 4 is the push rod; 5 is the swing shaft; 6 is the crankshaft; 6a is the stepped part; 6b is the relief part; 6c is the tapered hole; 7 is the torsion spring; 8 is the fork shaft; 9 is the fork; 10 is the first spring; 11 is the second spring. Detailed implementation manners

[0031] The following are specific embodiments of the present utility model in combination with the accompanying drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0033] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the multi - needle machine includes a bent needle base 1. The side of the bent needle base 1 protrudes with a first convex block 1a1 and a second convex block 1a2. The first convex block 1a1 and the second convex block 1a2 are provided with a through - hole 1b. A push rod 4 is inserted into the through - hole 1b, and the push rod 4 can drive the bent needle base 1 to move in the same direction.

[0034] The anti - collision needle structure includes a frame 2 and a protective shell 3. The protective shell 3 wraps outside the first convex block 1a1 and the second convex block 1a2. The push rod 4 is inserted into the through - hole 1b on the first convex block 1a1 and the second convex block 1a2 and drives the bent needle base 1 to move. The protective shell 3 protects the push rod 4 from being impacted.

[0035] The bottom plate of the frame 2 protrudes upward to form a limit boss 2a. The limit boss 2a extends to the edge of the frame 2 and the upper surface of the limit boss 2a is a plane. The surface of the protective shell 3 is a smooth arc surface. The limit boss 2a can be integrally formed with the bottom plate of the frame 2, which is convenient for production. The upper surface of the limit boss 2a is a plane and extends to the edge of the frame 2. When the protective shell 3 contacts and abuts against the limit boss 2a, there is no situation where part of the protective shell 3 is suspended. The protective shell 3 abuts against the limit boss 2a with an arc surface. The arc surface can bear a greater impact force relative to the plane. The smooth arc surface is beneficial to increasing the contact area and ensuring stable and reliable abutting and limiting between the protective shell 3 and the limit boss 2a.

[0036] A swing shaft 5 and a crank fastened to the swing shaft 5 are provided on the frame 2. A torsion spring 7 is provided on the swing shaft 5. The bent needle seat 1 is in clearance fit with the swing shaft 5. The crank is provided with a tapered hole 6c. The upper surface of the crank is recessed downward to form a stepped portion 6a. And one side of the crank away from the bent needle seat 1 gradually inclines outward from top to bottom to form a relief portion 6b. The stepped portion 6a and the relief portion 6b are smoothly transitioned. The elastic energy stored per unit volume of the torsion spring 7 is relatively large, which is beneficial to realizing a compact design of this anti-collision needle structure. The stability of the torsion spring 7 is relatively high. Even under the conditions of impact and vibration, its characteristics are relatively stable, which is beneficial to ensuring the stable operation of this anti-collision needle structure.

[0037] A fork shaft 8 and a fork 9 are also provided on the frame 2. The two ends of the fork 9 are respectively connected to the fork shaft 8 and the push pin 4. The fork shaft 8 can drive the fork 9 to make the push pin 4 cooperate or separate with the tapered hole 6c. A first spring 10 and a second spring 11 are provided on the fork 9. The two ends of the first spring 10 are respectively tightened against the end of the push pin 4 and the first convex block 1a1. When the bent needle seat 1 is turned upward, the two ends of the second spring 11 are respectively tightened against the fork 9 and the second convex block 1a2. The push pin 4 cooperates with the tapered hole 6c under the thrust of the spring to reset the bent needle seat 1.

[0038] The setting of the first spring 10 makes the fork 9 always closely abut against the end of the push pin 4. When the fork shaft 8 moves away from the crankshaft 6, the fork 9 drives the push pin 4 to separate from the tapered hole 6c. The second spring 11 is in a relaxed state and does not exert pressure on the second convex block 1a2. The push pin 4 no longer exerts pressure on the bent needle seat 1. The bent needle seat 1 does not squeeze the torsion spring 7. The torsion spring 7 is in an unlocked state. The two ends of the torsion spring 7 are respectively tightened against the stepped portion 6a and the bent needle seat 1 to make the bent needle seat 1 turn downward. The bent needle seat 1 moves to a space without obstacles, and personnel can easily thread the bottom thread into the bent needle hole to complete the thread-changing operation. After the thread-changing is completed, the bent needle seat 1 is pushed upward. The bent needle seat 1 turns upward. The torsion spring 7 is in a locked state. One end of the torsion spring 7 is located at the bent needle seat 1 and the other end is located at the relief portion 6b. It cannot exert a force on the bent needle seat 1 to make it turn downward. The chasing pin cooperates with the tapered hole 6c under the thrust of the second spring 11, and the bent needle seat 1 is reset.

[0039] In the anti-collision needle structure of this multi-needle machine, when the bent needle base 1 flips downward, it flips until the protective shell 3 abuts against and is limited by the limit boss 2a. The limit boss 2a is used to limit the flipping angle, avoiding the situation of broken needles caused by the flipping of the bent needle base 1 due to misoperation, and improving the fault tolerance rate of the operation. The setting of the protective shell 3 prevents direct collision between the bent needle base 1 and the limit boss 2a from causing damage. When the protective shell 3 abuts against and is limited by the limit boss 2a, an operation space is left for personnel between the bent needle base 1 and the limit boss 2a, which is beneficial to ensuring the ease and smoothness of the thread-changing operation.

[0040] Although terms such as bent needle base 1, bump 1a, first bump 1a1, second bump 1a2, through hole 1b, frame 2, limit boss 2a, protective shell 3, push rod 4, swing shaft 5, crankshaft 6, stepped portion 6a, relief portion 6b, tapered hole 6c, torsion spring 7, fork shaft 8, fork 9, first spring 10, second spring 11, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. An anti-collision needle structure for a multi-needle machine. The multi-needle machine includes a curved needle base (1), characterized in that, The anti-collision needle structure includes a frame (2) and a protective shell (3). The protective shell (3) protrudes from the side of the bent needle seat (1). The bottom plate of the frame (2) protrudes upward to form a limiting boss (2a). The limiting boss (2a) is located below the bent needle seat (1). The bent needle seat (1) can be turned over on the frame (2). When the bent needle seat (1) is turned downward, the protective shell (3) abuts against the limiting boss (2a) for limiting to stop the turning of the bent needle seat (1).

2. The anti-collision needle structure of a multi-needle machine according to claim 1, characterized in that, The limiting boss (2a) extends to the edge of the frame (2) and the upper surface of the limiting boss (2a) is a plane.

3. The anti-collision needle structure of a multi-needle machine according to claim 1 or 2, characterized in that, The surface of the protective shell (3) is a smooth arc surface.

4. The anti-collision needle structure of a multi-needle machine according to claim 3, characterized in that, A number of protrusions (1a) protrude from the side of the bent needle seat (1). Through holes (1b) are provided in the protrusions (1a). A push pin (4) is inserted into the through holes (1b). The push pin (4) can drive the bent needle seat (1) to move in the same direction. The protective shell (3) wraps around the protrusions (1a).

5. The anti-collision needle structure of a multi-needle machine according to claim 4, characterized in that, A swing shaft (5) and a crank (6) fastened to the swing shaft (5) are provided on the frame (2). A torsion spring (7) is provided on the swing shaft (5). The bent needle seat (1) is in clearance fit with the swing shaft (5). The bent needle seat (1) is turned downward by the action of the torsion spring (7).

6. The anti-collision needle structure of a multi-needle machine according to claim 5, characterized in that A stepped portion (6a) is formed by the downward depression of the upper surface of the crank (6). And at least one side of the crank (6) is gradually inclined outward from top to bottom to form a relief portion (6b). The stepped portion (6a) and the relief portion (6b) are smoothly transitioned. When the bent needle seat (1) is away from the crank (6), both ends of the torsion spring (7) abut against the stepped portion (6a) and the bent needle seat (1) respectively to turn the bent needle seat (1) downward. When the bent needle seat (1) is turned upward, one end of the torsion spring (7) is located at the relief portion (6b).

7. The anti-collision needle structure of a multi-needle machine according to claim 6, characterized in that, A fork shaft (8) and a fork (9) are further provided on the frame (2). Both ends of the fork (9) are respectively connected to the fork shaft (8) and the push pin (4). The crank (6) is provided with a tapered hole (6c). The fork shaft (8) can drive the fork (9) to make the push pin (4) cooperate with or separate from the tapered hole (6c). When the push pin (4) is separated from the tapered hole (6c), the bent needle seat (1) is turned downward by the action of the torsion spring (7).

8. The anti-collision needle structure of a multi-needle machine according to claim 7, characterized in that The protrusions (1a) include a first protrusion (1a1) and a second protrusion (1a2). A first spring (10) and a second spring (11) are provided on the fork (9). Both ends of the first spring (10) respectively abut against the end of the push pin (4) and the first protrusion (1a1). When the bent needle seat (1) is turned upward, both ends of the second spring (11) respectively abut against the fork (9) and the second protrusion (1a2). The push pin (4) is pushed by the spring to cooperate with the tapered hole (6c) to reset the bent needle seat (1).

Images