Speed reduction controlled thread take-up mechanism and sewing machine

Abstract

The invention discloses a speed-reduction-controlled thread take-up mechanism and a sewing machine, and relates to the technical field of sewing machines, the speed-reduction-controlled thread take-up mechanism comprises a base, a main shaft, a thread bonding cam and a speed reduction assembly, the main shaft is rotationally matched on the base, the thread bonding cam is rotationally matched on the base, and a groove is formed in the side wall of the thread bonding cam; the speed reduction assembly is arranged between the spindle and the routing cam, the spindle drives the routing cam to rotate through the speed reduction assembly, and the rotating speed of the routing cam is lower than that of the spindle. According to the take-up mechanism with the speed reduction control function and the sewing machine, the low rotating speed of the thread bonding cam can be kept under the high-speed sewing condition, and then the thread supply stability is kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewing machine technical field, and particularly relates to a speed reduction control thread tension mechanism and a sewing machine. BACKGROUND

[0002] The thread tension mechanism is one of the core mechanisms of the sewing machine, and its working performance directly determines whether the stitches can be formed, whether the stitches are beautiful and firm. The thread tension mechanism is divided into cam type thread tension mechanism, connecting rod type thread tension mechanism, slide rod type thread tension mechanism, rotary type (special-shaped wheel) thread tension mechanism and needle bar thread tension mechanism according to the driving mode. The cam type thread tension mechanism drives the thread tension lever roller in contact with it to make the thread tension lever roll around its axis to make regular swing through the rotation of a specific shape of cylindrical cam. The shape of the cam determines the motion trajectory and timing of the thread tension lever. Since the cam type thread tension mechanism has the advantages of simple structure and low manufacturing cost, it is mostly used in common household sewing machines.

[0003] When the cam speed is increased, the heavy parts of the thread tension lever may not immediately follow the instructions of the cam, resulting in lag, slow and weak thread take-up action when the cam needs to tighten the stitches and make the cam need to accelerate suddenly. When the need for rapid deceleration or stopping, the thread tension lever will continue to move forward due to inertia, resulting in overshoot, causing it to recover more thread than expected, or causing severe shaking. This motion distortion directly destroys the precise timing coordination between the thread supply, thread take-up and needle and shuttle action, resulting in unstable thread supply. SUMMARY

[0004] The purpose of the present application is to provide a speed reduction control thread tension mechanism and a sewing machine, which can realize stable thread supply when the main shaft rotates at high speed.

[0005] To achieve the above purpose, the present application provides a speed reduction control thread tension mechanism, comprising a base, a main shaft, a thread striking cam and a speed reduction assembly.

[0006] The main shaft is rotatably connected to the base.

[0007] The thread striking cam is rotatably connected to the base, and the side wall of the thread striking cam has a groove.

[0008] The speed reduction assembly is arranged between the main shaft and the thread striking cam, and the main shaft drives the thread striking cam to rotate through the speed reduction assembly, so that the rotating speed of the thread striking cam is lower than the rotating speed of the main shaft.

[0009] In some embodiments, the speed reduction assembly comprises a first gear and a second gear, the first gear is arranged on the main shaft, the second gear is rotatably connected to the base, the first gear is smaller than the second gear, the first gear and the second gear are engaged, and the second gear can drive the thread striking cam to rotate.

[0010] In some embodiments, a transmission assembly is also provided, the transmission assembly including a plurality of equal-ratio gears, the plurality of equal-ratio gears having the same structure, one of the equal-ratio gears being disposed on the second gear and rotating synchronously with the second gear, another equal-ratio gear being connected to the wire-laying cam via a drive shaft, and the plurality of equal-ratio gears meshing with each other.

[0011] In some embodiments, a connecting shaft is provided between the proportional gear and the second gear, and the connecting shaft is engaged with the second gear and the proportional gear respectively.

[0012] In some embodiments, the second gear is provided with a plurality of weight-reducing holes.

[0013] In some embodiments, the first gear is sleeved on the main shaft, and the first gear is provided with a retaining ring, which can clamp the main shaft by bolts.

[0014] A sewing machine comprising a thread take-up mechanism with speed reduction control as described above.

[0015] In some embodiments, the base is provided with a first bracket, the first bracket is provided with a wire baffle, the wire baffle can extend into the groove of the wire-tapping cam, and the wire baffle is provided with a wire-picking hole.

[0016] In some embodiments, the first bracket is provided with a second bracket, the second bracket is provided with a clearance groove, the wire-punching cam can pass through the clearance groove, and both sides of the second bracket are provided with wire guide plates, the two wire guide plates are respectively located on both sides of the wire-punching cam, the wire guide plates are provided with round holes, and the two round holes are colinearly distributed with the wire-picking hole.

[0017] In some embodiments, both the first bracket and the second bracket are detachably connected to the sewing machine.

[0018] Compared to the aforementioned background technology, the speed-reducing thread take-up mechanism provided in this application includes a base, a main shaft, a thread-attaching cam, and a speed reduction assembly. The main shaft is rotatably mounted on the base, and the thread-attaching cam is rotatably mounted on the base. The side wall of the thread-attaching cam has a groove. The speed reduction assembly is located between the main shaft and the thread-attaching cam. The main shaft drives the thread-attaching cam to rotate through the speed reduction assembly, and the rotational speed of the thread-attaching cam is lower than that of the main shaft. The main shaft drives the thread-attaching cam to rotate through the speed reduction assembly, and the speed reduction of the cam makes the rotational speed of the cam lower than that of the main shaft, and satisfies the condition that the rotational speed of the main shaft is divisible by the rotational speed of the thread-attaching cam. That is, when the thread-attaching cam rotates one revolution, the main shaft also rotates an integer number of revolutions. Even when the main shaft is at a high speed, the speed of the thread-attaching cam can be reduced by the speed reduction assembly, so that the thread-attaching cam can maintain a low speed, avoiding the influence of inertial forces on the normal operation of the thread-attaching cam, and thus avoiding problems such as thread breakage, skipped stitches, and uneven stitches. The speed-reducing thread take-up mechanism and sewing machine of this application can maintain a low speed of the thread-attaching cam under high-speed sewing conditions, thereby maintaining the stability of thread supply. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the thread-taking mechanism for deceleration control according to an embodiment of this application;

[0021] Figure 2 This is a side view of the deceleration control line-taking mechanism according to an embodiment of this application;

[0022] Figure 3 This is a front view of the deceleration control thread-taking mechanism according to an embodiment of this application;

[0023] Figure 4 This is a top view of the deceleration control line-taking mechanism according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram showing the engagement of the second gear and the first proportional gear in the deceleration control thread-taking mechanism according to an embodiment of this application.

[0025] Figure 6 This is a schematic diagram of the structure of the second gear of the deceleration control line-taking mechanism in an embodiment of this application.

[0026] Figure 7 This is a schematic diagram of the structure of the first gear of the deceleration control thread-taking mechanism according to an embodiment of this application.

[0027] in:

[0028] 1. Base; 2. Main shaft; 3. Wire-applying cam; 4. Reduction assembly; 41. First gear; 411. Retaining ring; 42. Second gear; 421. Weight reduction hole; 5. Transmission assembly; 51. First proportional gear; 52. Second proportional gear; 53. Connecting shaft; 6. First bracket; 7. Wire stop plate; 8. Second bracket; 9. Wire guide plate. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0032] like Figures 1 to 7 As shown, the deceleration control thread-taking mechanism provided in this application embodiment includes a base 1, a main shaft 2, a thread-attaching cam 3, and a deceleration assembly 4. The main shaft 2 is rotatably mounted on the base 1, and the thread-attaching cam 3 is rotatably mounted on the base 1. The side wall of the thread-attaching cam 3 has a groove. The deceleration assembly 4 is disposed between the main shaft 2 and the thread-attaching cam 3. The main shaft 2 drives the thread-attaching cam 3 to rotate through the deceleration assembly 4. The rotational speed of the thread-attaching cam 3 is lower than the rotational speed of the main shaft 2.

[0033] It is understandable that the spindle 2 drives the stitching cam 3 to rotate through the reduction assembly 4. The reduction of the spindle 2 by the reduction assembly 4 makes the rotation speed of the cam lower than that of the spindle 2, and the rotation speed of the spindle 2 is divisible by the rotation speed of the stitching cam 3. That is, when the stitching cam 3 rotates one revolution, the spindle 2 also rotates an integer number of revolutions. Even if the spindle 2 is at a high speed, the reduction assembly 4 can reduce the rotation speed of the stitching cam 3, so that the stitching cam 3 can be kept at a low speed. This avoids the inertial force affecting the normal operation of the stitching cam 3, and thus avoids problems such as broken thread, skipped stitches, and uneven stitches.

[0034] In some embodiments, such as Figures 1 to 7As shown, the reduction assembly 4 includes a first gear 41 and a second gear 42. The first gear 41 is mounted on the main shaft 2, and the second gear 42 is rotatably engaged on the base 1. The first gear 41 is smaller than the second gear 42. The first gear 41 meshes with the second gear 42, and the second gear 42 can drive the wire-tapping cam 3 to rotate.

[0035] Understandably, the first gear 41 is mounted on the main shaft 2 and rotates synchronously with the main shaft 2. The rotational speed of the first gear 41 is the same as that of the main shaft 2. The second gear 42 meshes with the first gear 41. The linear velocity of the second gear 42 is the same as that of the first gear 41. Since the second gear 42 is larger than the first gear 41, the angular velocity of the second gear 42 is smaller than that of the first gear 41. The wire-casting cam 3 rotates synchronously with the second gear 42, and the rotational speed of the wire-casting cam 3 is the same as that of the second gear 42. Thus, the rotational speed of the main shaft 2 is greater than that of the wire-casting cam 3.

[0036] Preferably, the first gear 41 and the second gear 42 have the same number of teeth, and the radius of the second gear 42 is twice the radius of the first gear 41, that is, the rotational speed ratio of the first gear 41 to the second gear 42 is 2:1, so that when the second gear 42 rotates one revolution, the first gear 41 can rotate two revolutions. It is understood that in some other embodiments, the radius of the second gear 42 can be 3 times or 4 times the radius of the first gear 41.

[0037] In some other preferred embodiments, the first gear 41 and the second gear 42 are the same size, and the tooth ratio of the second gear 42 to the first gear 41 can be 2:1. Since the first gear 41 and the second gear 42 have the same radius but different numbers of teeth, the rotational speed ratio of the first gear 41 to the second gear 42 is 2:1, meaning that when the second gear 42 rotates one revolution, the first gear 41 can rotate two revolutions. It is understood that in some other embodiments, the tooth ratio of the second gear 42 to the first gear 41 can be 3:1 or 4:1.

[0038] Based on the above embodiments, such as Figures 1 to 4 As shown, the thread take-up mechanism is also provided with a transmission component 5. The transmission component includes several equal-proportional gears. The several equal-proportional gears have the same structure. One of the equal-proportional gears is located on the second gear 42 and rotates synchronously with the second gear 42. The other equal-proportional gear is connected to the thread-beating cam 3 through a drive shaft.

[0039] Specifically, there are two equal-ratio gears, namely a first equal-ratio gear 51 and a second equal-ratio gear 52. The first equal-ratio gear 51 rotates synchronously with the second gear 42. The second equal-ratio gear 52 is fixed to the wire-casting cam 3 through a drive shaft. The base 1 is provided with a mating hole, and the drive shaft rotates and engages in the mating hole of the base 1. The wire-casting cam 3 and the second equal-ratio gear 52 are located on both sides of the base 1, respectively. The wire-casting cam 3 is located on the side away from the second gear 42. The two equal-ratio gears mesh with each other, and the second gear 42 can drive the wire-casting cam 3 to rotate through the two equal-ratio gears and the drive shaft.

[0040] It is understandable that by setting the transmission component 5, the second gear 42 can be arranged in the empty space of the base 1, thereby effectively utilizing the empty space of the base 1, and making the structure of the thread take-up mechanism compact, so that it can be arranged in a sewing machine with relatively narrow space.

[0041] In some embodiments, such as Figure 5 As shown, a connecting shaft 53 is provided between the first gear 51 and the second gear 42, and the connecting shaft 53 is engaged with the second gear 42 and the first gear 51 respectively.

[0042] Specifically, one end of the connecting shaft 53 is rotatably connected to the base 1, and the other end is provided with two spaced limiting protrusions. The center of the first proportional gear 51 and the second gear 42 are both provided with inner holes, and the inner hole walls of the first proportional gear 51 and the second gear 42 are both provided with limiting grooves. The two ends of the connecting shaft 53 extend into the inner holes of the first proportional gear 51 and the second gear 42, respectively, and the limiting protrusions at both ends of the connecting shaft 53 are respectively transitionally fitted into the limiting grooves of the inner hole walls of the first proportional gear 51 and the second gear 42, so as to realize the snap-fit ​​between the connecting shaft 53 and the first proportional gear 51 and the second gear 42.

[0043] It is understandable that the second gear 42 and the first proportional gear 51 are rotatably connected to the base 1 through the connecting shaft 53. The connecting shaft 53 is engaged with the first proportional gear 51 and the second gear 42 respectively through two limiting protrusions. After the thread take-up mechanism has been used for a long time, the first proportional gear 51 can be quickly removed from the second gear 42, which facilitates maintenance or replacement of parts.

[0044] In some embodiments, such as Figure 6 As shown, the second gear 42 is provided with multiple weight reduction holes 421.

[0045] Specifically, the multiple weight reduction holes 421 have the same shape, and the weight reduction holes 421 are arc-shaped elongated holes. The multiple weight reduction holes 421 are evenly distributed along the circumference of the second gear 42.

[0046] It is understandable that by setting the weight reduction hole 421, the weight of the second gear 42 can be reduced, thereby reducing the overall weight of the thread take-up mechanism and saving manufacturing costs.

[0047] In some embodiments, the first gear 41 is sleeved on the main shaft 2, and the first gear 41 is provided with a retaining ring 411, which can clamp the main shaft 2 by bolts.

[0048] Specifically, such as Figure 1 and Figure 7 As shown, a fixing ring 411 is fixedly installed on the first gear 41. The side wall of the fixing ring 411 is provided with a plurality of fixing holes evenly spaced along the circumference of the fixing ring 411. The fixing holes are threaded holes, and a bolt is threaded into each fixing hole. By tightening the bolt, the end of the bolt can abut against the main shaft 2 and apply pressure to the main shaft 2.

[0049] Understandably, the bolts in each fixing hole apply pressure to the spindle 2, and the friction between the bolts and the spindle 2 can fix the fixing ring 411 to the spindle 2. Since the first gear 41 and the fixing ring 411 are an integral structure, the first gear 41 is fixed to the spindle 2. When the spindle 2 rotates, the first gear 41 can rotate synchronously with the spindle 2. When the first gear 41 needs to be replaced, the bolts only need to be unscrewed to remove the first gear 41 from the spindle 2, which is convenient for maintenance.

[0050] The sewing machine provided according to the embodiments of this application includes the thread take-up mechanism with the speed reduction control described above.

[0051] Specifically, the speed reduction control thread take-up mechanism is installed on the sewing machine. The main shaft 2 is the main shaft 2 of the sewing machine. The rotation of the main shaft 2 controls the up and down movement of the sewing machine needle. The sewing thread is pulled out from the sewing machine spool, passes through the tension plate, thread hook and other thread guide components, and then passes through the round holes of the two thread guide plates 9 and the thread take-up hole, and is finally guided to the needle.

[0052] It is understandable that when the spindle 2 rotates at high speed, the spindle 2 drives the wire-feeding cam 3 to rotate at low speed through the reduction assembly 4, so as to avoid the inertial force interfering with the rotation of the wire-feeding cam 3 due to excessive rotation speed, thereby avoiding unstable wire supply.

[0053] In some embodiments, the sewing machine is provided with a first bracket 6, the first bracket 6 is provided with a thread stop plate 7, the thread stop plate 7 can extend into the groove of the stitching cam 3, and the thread stop plate 7 is provided with a thread take-up hole.

[0054] Specifically, the first bracket 6 is installed on the sewing machine, the thread stop plate 7 is located directly above the thread-catching cam 3 and is vertically distributed, and the thread take-up hole is elongated and extends in the vertical direction.

[0055] Understandably, the sewing thread passes through the take-up hole. When the thread-beating cam 3 rotates, depending on the shape of the thread-beating cam 3, the side wall of the thread-beating cam 3 can push the sewing thread upward at a specific time to complete the take-up action. When the thread-beating cam 3 is not in contact with the sewing thread, the thread-letting action is performed.

[0056] In some embodiments, the sewing machine is provided with a second support 8, the second support 8 is provided with a relief groove, the thread-beating cam 3 can pass through the relief groove, and thread guide plates 9 are provided on both sides of the second support 8. The two thread guide plates 9 are respectively located on both sides of the thread-beating cam 3. The thread guide plates 9 are provided with round holes, and the two round holes are distributed colinearly with the thread take-up hole.

[0057] Specifically, the second bracket 8 is installed on the sewing machine. The second bracket 8 is located between the thread stop plate 7 and the thread take-up cam 3. The second bracket 8 is placed horizontally and has two parallel and spaced clearance grooves. The clearance grooves correspond to the two side walls of the groove of the thread take-up cam 3. When the thread take-up cam 3 rotates, the two side walls of the groove of the thread take-up cam 3 can move upward and pass through the corresponding clearance grooves. Two thread guide plates 9 are located on both sides of the second bracket 8. Each thread guide plate 9 has a round hole. The round holes of the two thread guide plates 9 are collinear with the thread take-up hole. The sewing thread needs to pass through one round hole first before it can pass through the thread take-up hole. Then the sewing thread will pass through the other round hole before it can extend out of the thread take-up mechanism.

[0058] Understandably, by setting the thread guide plate 9, the sewing thread can be limited, thereby determining the path and position of the sewing thread and preventing it from going astray when the thread take-up mechanism is running.

[0059] Based on the above embodiments, the second bracket 8 is detachably connected to the second bracket 8.

[0060] Specifically, both the first bracket 6 and the second bracket 8 are provided with mounting holes. Bolts are inserted into the mounting holes of the first bracket 6 and the second bracket 8 and fixed to the corresponding positions on the sewing machine, thereby enabling a detachable connection between the first bracket 6 and the second bracket 8 and the sewing machine. When it is necessary to remove the first bracket 6 and the second bracket 8, simply unscrew the bolts to quickly remove the first bracket 6 and the second bracket 8 from the sewing machine.

[0061] Understandably, when the wire-punching cam 3 needs to be replaced, the second bracket 8 also needs to be removed. At this time, the second bracket 8 can be removed from the first bracket 6 by unscrewing the bolts, so as to avoid the first bracket 6 and the second bracket 8 affecting the disassembly of the wire-punching cam 3.

[0062] In summary, the speed-reducing thread take-up mechanism and sewing machine provided in this application can maintain a low rotational speed of the thread-feeding cam 3 under high-speed sewing conditions, thereby maintaining thread supply stability. It should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0063] The thread take-up mechanism for speed reduction control and the sewing machine provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A speed-reducing controlled thread-taking mechanism, characterized in that, include: Base (1); Main shaft (2), which is rotatably fitted on the base (1); A wire-punching cam (3) is rotatably fitted on the base (1), and the side wall of the wire-punching cam (3) has a groove; A speed reduction assembly (4) is provided between the main shaft (2) and the wire-laying cam (3). The main shaft (2) drives the wire-laying cam (3) to rotate through the speed reduction assembly (4) so ​​that the speed of the wire-laying cam (3) is lower than the speed of the main shaft (2).

2. The speed-reducing control thread-taking mechanism according to claim 1, characterized in that, The deceleration assembly (4) includes a first gear (41) and a second gear (42). The first gear (41) is located on the main shaft (2), and the second gear (42) is rotatably engaged with the base (1). The first gear (41) is smaller than the second gear (42). The first gear (41) meshes with the second gear (42), and the second gear (42) can drive the wire-laying cam (3) to rotate.

3. The speed-reducing control thread-taking mechanism according to claim 2, characterized in that, The transmission assembly (5) is also provided. The transmission assembly (5) includes several equal-ratio gears. The several equal-ratio gears have the same structure. One of the equal-ratio gears is located on the second gear (42) and rotates synchronously with the second gear (42). The other equal-ratio gear is connected to the wire-laying cam (3) through a drive shaft. The several equal-ratio gears mesh with each other.

4. The speed-reducing control thread-taking mechanism according to claim 2, characterized in that, A connecting shaft (53) is provided between the proportional gear and the second gear (42), and the connecting shaft (53) is engaged with the second gear (42) and the proportional gear respectively.

5. The speed-reducing control thread-taking mechanism according to claim 1, characterized in that, The second gear (42) is provided with multiple weight reduction holes (421).

6. The deceleration control thread-taking mechanism according to claim 5, characterized in that, The first gear (41) is sleeved on the main shaft (2), and the first gear (41) is provided with a retaining ring (411), which can clamp the main shaft (2) by bolts.

7. A sewing machine, characterized in that, The line take-up mechanism includes the deceleration control described in any one of claims 1-6.

8. The speed-reducing control thread-taking mechanism according to claim 7, characterized in that, The base (1) is provided with a first bracket (6), the first bracket (6) is provided with a wire baffle (7), the wire baffle (7) can extend into the groove of the wire-tapping cam (3), and the wire baffle (7) is provided with a wire-picking hole.

9. The speed-reducing control thread-taking mechanism according to claim 8, characterized in that, The base (1) is provided with a second bracket (8), the second bracket (8) is provided with a clearance groove, the wire-punching cam (3) can pass through the clearance groove, and the second bracket (8) is provided with wire guide plates (9) on both sides. The two wire guide plates (9) are respectively located on both sides of the wire-punching cam (3). The wire guide plates (9) are provided with round holes, and the two round holes are distributed colinearly with the wire-picking hole.

10. The speed-reducing control thread-taking mechanism according to claim 9, characterized in that, The first bracket (6) and the second bracket (8) are detachably connected to the base (1).

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