CN222205702U - Transmission mechanism of flat seaming machine - Google Patents

Abstract

The utility model provides a transmission mechanism of a flat-bed sewing machine, belonging to the field of mechanical technology. It solves the problem of the complicated transmission structure of the existing flat-bed sewing machine. The transmission mechanism of the flat-bed sewing machine comprises a frame, a main shaft, an upper feed shaft for connecting a presser foot assembly and a lower feed shaft for connecting a cloth feeding assembly are arranged on the frame, an eccentric wheel is sleeved on the main shaft, and the transmission mechanism comprises a swing arm connecting the upper feed shaft and the lower feed shaft and a connecting rod with one end sleeved outside the eccentric wheel, and a crank group connecting the connecting rod and the swing arm and driving the swing arm to swing when the eccentric wheel rotates is arranged at the other end of the connecting rod, and the swing arm has a reinforcing structure to improve its own strength. The flat-bed sewing machine has the advantages of simplifying the transmission structure while ensuring synchronous feeding of the upper and lower parts of the sewing machine.

Description

Transmission mechanism of flat seaming machine

Technical Field

The utility model belongs to the technical field of sewing machines, and relates to a transmission mechanism of a flat sewing machine.

Background

The flat-seam sewing machine mainly uses a sewing thread to form a stitch on the sewing material, and makes one or more layers of sewing material interweave or sew up, and includes feeding mechanism, presser foot lifting mechanism and needle distance regulating mechanism. The motion of the mechanism is driven by a motor, and one motor can only control one mechanism, such as a presser foot lifting mechanism or a needle distance adjusting mechanism, if two functions are controlled at the same time, two motors are needed to control, so that the cost of the sewing machine is high.

The Chinese patent document data discloses a compound regulating mechanism and a sewing machine CN201920556091.5 using the same, wherein the compound regulating mechanism comprises a power source and a regulating shaft, the power source is connected with the regulating shaft, a needle pitch regulating crank, a driving crank and a presser foot lifting crank are sequentially arranged at the automatic power source end of the regulating shaft along the extending direction of the regulating shaft, the needle pitch regulating crank and the presser foot lifting crank can rotate relative to the regulating shaft, the needle pitch regulating crank is connected with a swinging seat of a feeding mechanism, the presser foot lifting crank is connected with a pressure lifting connecting rod of the presser foot lifting mechanism, and an electric control element is connected with the driving crank.

In the above document, the feeding mechanism and the presser foot lifting mechanism are driven by a driving source, specifically, the driving force output by the driving source transmits the driving force to the stitch length adjusting crank and the presser foot lifting crank through the adjusting shaft, and then the presser foot lifting mechanism and the feeding mechanism are driven to synchronously act, so that the presser foot lifting mechanism and the feeding mechanism are matched, and the up-down synchronous feeding of the sewing machine is realized. The adjusting crank is provided with a transmission mechanism for driving the feeding mechanism to act, the presser foot lifting crank is also provided with the transmission mechanism for driving the presser foot lifting mechanism to act, and the plurality of sets of transmission mechanisms lead to the complex structure of the sewing machine.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides a transmission mechanism of a flat sewing machine, which solves the technical problems of simplifying the transmission structure and simultaneously ensuring the synchronous feeding of the sewing machine up and down.

The aim of the utility model can be achieved by the following technical scheme:

The utility model provides a drive mechanism of flush joint machine, flush joint machine includes the frame, be equipped with the main shaft in the frame, be used for connecting the last pay-off axle of presser foot subassembly and be used for connecting the lower pay-off axle of work feed subassembly, a serial communication port, the cover is equipped with the eccentric wheel on the main shaft, and drive mechanism is including connecting the swing arm and the one end cover of going up pay-off axle and lower pay-off axle locate the connecting rod outside the eccentric wheel, the other end of connecting rod is equipped with connecting rod and swing arm and drives the crank group of swing arm wobbling when the eccentric wheel rotates, the swing arm has the additional strengthening who improves self intensity.

In the prior art, the main shaft is driven by the motor to rotate, the eccentric wheel is sleeved on the main shaft, one end of the connecting rod is sleeved outside the eccentric wheel, the other end of the connecting rod is connected with the crank group, the structure enables the eccentric wheel to convert the rotation motion of the main shaft into the up-and-down reciprocating motion of the connecting rod and transmit the up-and-down reciprocating motion to the crank group, and the crank group drives the swing arm to swing. On the basis of the structure, the swing arm is provided with the reinforcing structure for improving the strength of the swing arm, and when the swing arm drives the upper feeding shaft and the lower feeding shaft to synchronously act, the swing stability of the swing arm is good, so that the power transmission stability of the transmission mechanism is improved.

In the transmission mechanism of the lockstitch sewing machine, the swing arm is long, one end of the swing arm is connected with the upper feeding shaft, the other end of the swing arm is connected with the lower feeding shaft, the reinforcing structure comprises a plurality of reinforcing ribs fixedly connected inside the swing arm, and the reinforcing ribs divide the inside of the swing arm into four reinforcing areas along the length direction of the swing arm. Through the inside rational arrangement strengthening rib at the swing arm makes the swing arm divide into four reinforcement district along self length direction for the swing arm is all improved along self length direction's intensity.

In the transmission mechanism of the flat seaming machine, the swing arm is provided with a first side rod and a second side rod, the end parts of the first side rod and the end parts of the second side rod are connected, a gap is reserved between the first side rod and the second side rod, and the reinforcing rib is connected with the first side rod and the second side rod to divide the gap into the four reinforcing areas. The reinforcing area is equivalent to the hollow area inside the swing arm, the dead weight of the swing arm is reduced to a certain extent by the hollow arrangement, the swing arm is guaranteed to have good rigidity by the reinforcing ribs, namely, the structure is not easy to bend by improving the connection stability of the first side rod and the second side rod, and the condition that the swing arm is inconsistent in up-down swing amplitude due to deformation when the transmission force received by the swing arm is large is avoided, so that the up-down feeding consistency of the flat seaming machine is guaranteed.

In the transmission mechanism of the flat seaming machine, a plurality of reinforcing ribs are arranged along the length direction of the first side rod and are intersected with the second side rod, and the reinforcing areas are triangular. The fretwork area is triangle-shaped for the dead weight is lighter under the prerequisite of swing arm assurance rigidity, and when the swing arm transmitted power, this structure makes the atress of swing arm can be along different strengthening ribs dispersion, local stress concentration when avoiding the swing arm atress, simultaneously, the strengthening rib is the self intensity of further improvement swing arm of triangle-shaped arrangement's structure.

In the transmission mechanism of the lockstitch sewing machine, the number of the reinforcing ribs is three, and the second side rod is provided with the mounting holes for connecting the crank group at the junction of the three reinforcing ribs. The intensity of the junction of three strengthening rib is high, and this department is difficult for the atress to take place to break, and during power transmission, distributes the power of crank group transmission along the length direction of swing arm through all strengthening ribs, avoids the local atress of swing arm, improves the swing stability of swing arm.

In the transmission mechanism of the lockstitch sewing machine, one side of the eccentric wheel is provided with the counterweight part, the counterweight part protrudes towards one side of the base circle along the radial direction of the eccentric wheel, a gap is reserved between the counterweight part and the connecting rod along the axial direction of the main shaft, and a bearing is arranged between the connecting rod and the eccentric wheel. The structure avoids arranging a connecting structure with the main shaft on the eccentric wheel, so that the rotation force of the main shaft is stably transmitted to the eccentric wheel, the gap is arranged, the rotation of the counterweight part is prevented from interfering with the movement of the connecting rod, the eccentric wheel stably transmits power to the connecting rod through the bearing, the structure improves the stability of power transmission, the counterweight part is a part of the eccentric wheel, namely, the counterweight part and the eccentric wheel are of an integrated structure.

In the transmission mechanism of the lockstitch sewing machine, the counterweight part is fan-shaped and is provided with the central hole for the spindle to pass through, the outer cambered surface of the counterweight part is provided with a plurality of connecting holes extending to the central hole along the circumferential direction of the spindle, and the bolts pass through the connecting holes to enable the eccentric wheel to synchronously rotate along with the spindle. The structure improves the connection stability of the counterweight part and the main shaft, the bolt can be a compression bolt, the counterweight part and the main shaft are connected in a mode of abutting along the circumferential direction of the main shaft, the counterweight part is sleeved on the main shaft, the contact area between the eccentric wheel and the supporting plate is increased, the protruding direction of the counterweight part is opposite to the protruding direction of the eccentric wheel, the inertia generated by the rotation of the eccentric wheel along with the main shaft is counteracted through the counterweight part, on the basis, the connecting hole is formed in the outer arc surface of the counterweight part, so that the bolt abuts against the main shaft around the circumferential direction of the main shaft, and the structure further improves the connection stability of the eccentric wheel and the main shaft.

In the transmission mechanism of the lockstitch sewing machine, the transmission mechanism further comprises a swinging frame rotatably connected to the frame, the crank group comprises at least one pair of cranks, one end of each of the two cranks is hinged to the connecting rod, one end of each of the two cranks, which is far away from the connecting rod, is hinged to the swinging arm, and the other end of each of the two cranks, which is far away from the connecting rod, is hinged to the swinging frame. The structure enables the swing arm to swing by taking a hinging point of the crank hinged with the swing frame as a center under the drive of the connecting rod, and enables the swing track of the swing arm to be determined; furthermore, because the moving stroke of the connecting rod is determined, and the swinging frame is rotationally connected with the frame, the position of the hinge point can be changed by adjusting the angle of the swinging frame, so that the swinging amplitude of the swinging arm is adjustable, and the swinging amplitude of the swinging arm is the stitch length of the sewing machine.

In the transmission mechanism of the flat seaming machine, the swing frame is provided with the yielding groove in a U shape, the crank group comprises two pairs of cranks, the two pairs of cranks are all positioned in the yielding groove, the swing arm and the connecting rod are both positioned between the two pairs of cranks, and the joint of the swing arm and the crank is positioned at the notch of the yielding groove. The two pairs of cranks further improve the stability of power transmission, because the swing amplitude of the swing arm is not uniquely determined, the section of the swing amplitude of the swing arm is increased by setting the connection position of the swing arm and the cranks.

Compared with the prior art, the transmission mechanism of the lockstitch sewing machine has the advantages that the eccentric wheel converts the rotary motion of the main shaft into the up-and-down reciprocating motion of the connecting rod, the connecting rod drives the swing arm to swing through the crank set, the upper feeding shaft and the lower feeding shaft synchronously swing along with the swing arm on one hand, and the presser foot assembly and the cloth feeding assembly share one transmission structure on the other hand, so that the transmission structure is simplified, and the up-and-down feeding consistency of the sewing machine is ensured.

Drawings

FIG. 1 is a schematic diagram of the structure of the transmission mechanism of the sewing machine installed in a frame.

Fig. 2 is a schematic structural view of the transmission mechanism of the sewing machine.

Fig. 3 is a front view of fig. 2.

Fig. 4 is an exploded view of fig. 2.

In the figure, 1, a frame, 2, a main shaft, 3, an upper feeding shaft, 4, a lower feeding shaft, 5, an eccentric wheel, 51, a counterweight part, 52, a central hole, 53, a connecting hole, 6, a swing arm, 61, a first side bar, 62, a second side bar, 63, a mounting hole, 7, a connecting rod, 71, a bearing, 8, a crank group, 81, a crank, 9, a reinforcing structure, 91, a reinforcing rib, 92, a reinforcing area, 10, a swing frame, 101, a yielding groove, 11, a connecting rod group, 12, a presser foot assembly, 13 and a cloth feeding assembly.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in figure 1, the transmission mechanism of the lockstitch sewing machine comprises a frame 1, wherein a main shaft 2, an upper feeding shaft 3 for connecting a presser foot assembly and a lower feeding shaft 4 for connecting a cloth feeding assembly are arranged on the frame 1, an eccentric wheel 5 is sleeved on the main shaft 2, the transmission mechanism comprises a swing arm 6 for connecting the upper feeding shaft 3 and the lower feeding shaft 4 and a connecting rod 7 with one end sleeved outside the eccentric wheel 5, a bearing 71 is arranged between the connecting rod 7 and the eccentric wheel 5, the other end of the connecting rod 7 is provided with a crank group 8 for connecting the connecting rod 7 and the swing arm 6 and driving the swing arm 6 to swing when the eccentric wheel 5 rotates, the swing arm 6 is in a strip shape, one end of the swing arm 6 is connected with the upper feeding shaft 3, the other end of the swing arm 6 is connected with the lower feeding shaft 4 through a connecting rod group 11, the connecting rod group 11 comprises a small crank 81 and a connecting rod, and two ends of the connecting rod are hinged with the swing arm 6 and the small crank 81.

As shown in fig. 2-4, the swing arm 6 has a reinforcing structure 9 for improving the strength of the swing arm 6, in the application, the reinforcing structure 9 comprises a plurality of reinforcing ribs 91 which are fixedly connected in the swing arm 6 and divide the swing arm 6 into four reinforcing areas 92, the reinforcing areas 92 are hollowed areas in the swing arm 6, the reinforcing ribs 91 ensure good rigidity of the swing arm 6, so that the swing arm 6 is not easy to deform under the working condition of large transmission force, the stability of power transmission is ensured, the reinforcing areas 92 ensure the light weight arrangement of the swing arm 6, the loss of power transmission is reduced, and the stability of swing of the swing arm 6 is ensured. The swing arm 6 has the first side lever 61 and the second side lever 62 that the tip links to each other, the clearance has between first side lever 61 and the second side lever 62, the reinforcing rib 91 connects first side lever 61 and second side lever 62 and falls into above-mentioned four reinforcing areas 92 with the clearance, reinforcing areas 92 all are triangle-shaped, the quantity of reinforcing rib 91 is three, the length direction setting of first side lever 61 is followed to three reinforcing rib 91 and is met in second side lever 62, the mounting hole 63 that is used for connecting crank group 8 has been seted up at the intersection of three reinforcing rib 91 to the second side lever 62, in this embodiment, reinforcing structure 9 includes the reinforcing plate that the three links firmly outside swing arm 6 and set up along swing arm 6 length direction interval, the reinforcing plate is L shape, and the both ends of reinforcing plate all link firmly with one side of swing arm 6.

One side of the eccentric wheel 5 is provided with a fan-shaped counterweight part 51, the counterweight part 51 protrudes towards one side of the base circle of the eccentric wheel 5 along the radial direction of the eccentric wheel 5, the counterweight part 51 is provided with a central hole 52 for the spindle 2 to penetrate through, the hole wall of the central hole 52 is provided with a connecting hole 53 penetrating through the fan-shaped surface of the counterweight part 51, a fastening bolt penetrates through the connecting hole 53 and abuts against the outer peripheral surface of the spindle 2 to enable the eccentric wheel 5 to be connected with the spindle 2, in the embodiment, the number of the connecting holes 53 is three, and in actual production, the number of the connecting holes 53 can be two or four. The eccentric 5 and the weight portion 51 are integrally formed.

The transmission mechanism further comprises a swing frame 10 which is rotationally connected to the frame 1, the swing frame 10 is provided with a U-shaped yielding groove 101, the crank set 8 comprises two pairs of cranks 81, the two pairs of cranks 81 are all located in the yielding groove 101, the swing arm 6 and the connecting rod 7 are all located between the two pairs of cranks 81, as shown in fig. 3, the upper end of the swing arm 6 and the connecting rod 7 are provided with gaps along the axial direction of the main shaft 2 so as to avoid interference with the swing arm 6 when the connecting rod 7 moves, one ends of the connecting rod 7 and the four cranks 81 are all connected through transmission pins, one end of one crank 81 in each pair of cranks 81, which is far away from the connecting rod 7, is hinged with the swing frame 10, and one end of the other crank 81 in each pair of cranks 81, which is far away from the connecting rod 7, is hinged with the swing frame 10, and the joint of the swing arm 6 and the crank 81 is located at the notch of the yielding groove 101.

The motor power output of the connecting spindle 2 drives the spindle 2 to rotate, the connecting rod 7 drives the crank 81 to rotate around the hinging point of the swinging frame 10 by reciprocating up and down to rotate the eccentric wheel 5, so that the swinging arm 6 swings, the crank 81 drives the upper feeding shaft 3 to swing on one hand, and the crank 81 drives the lower feeding shaft 4 to swing through the connecting rod group 11 on the other hand, so that the upper feeding shaft 3 and the lower feeding shaft 4 swing synchronously, and therefore the upper and lower synchronous feeding of the sewing machine is realized.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Although terms of the frame 1, the main shaft 2, the upper feed shaft 3, the lower feed shaft 4, the eccentric 5, the weight portion 51, the center hole 52, the connection hole 53, the swing arm 6, the first side lever 61, the second side lever 62, the mounting hole 63, the link 7, the bearing 71, the crank set 8, the crank 81, the reinforcing structure 9, the reinforcing rib 91, the reinforcing area 92, the swing frame 10, the relief groove 101, the link set 11, the presser foot assembly 12, the feed assembly 13, etc. are used more herein, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the nature of the utility model and should be construed in a manner consistent with their spirit and scope.

Claims (9)

1. The utility model provides a drive mechanism of flush joint machine, flush joint machine includes frame (1), be equipped with main shaft (2) on frame (1), be used for connecting last pay-off axle (3) of presser foot subassembly (12) and be used for connecting lower pay-off axle (4) of work feed subassembly (13), a serial communication port, cover is equipped with eccentric wheel (5) on main shaft (2), and drive mechanism is including connecting swing arm (6) and the one end cover of going up pay-off axle (3) and lower pay-off axle (4) and locating eccentric wheel (5) outside connecting rod (7), the other end of connecting rod (7) is equipped with connecting rod (7) and swing arm (6) and drives swing arm (6) wobbling crank group (8) when eccentric wheel (5) rotate, swing arm (6) have additional strengthening (9) that improve self intensity.

2. The transmission mechanism of the lockstitch sewing machine according to claim 1, wherein the swing arm (6) is in a strip shape, one end of the swing arm (6) is connected with the upper feeding shaft (3), the other end is connected with the lower feeding shaft (4), the reinforcing structure (9) comprises a plurality of reinforcing ribs (91) fixedly connected inside the swing arm (6), and the reinforcing ribs (91) divide the inside of the swing arm (6) into four reinforcing areas (92) along the length direction of the swing arm (6).

3. The transmission mechanism of the lockstitch sewing machine according to claim 2, wherein the swing arm (6) has a first side bar (61) and a second side bar (62) connected at an end portion, a gap is provided between the first side bar (61) and the second side bar (62), and the reinforcing rib (91) connects the first side bar (61) and the second side bar (62) to divide the gap into the four reinforcing areas (92).

4. A transmission mechanism of a lockstitch sewing machine according to claim 3, wherein a plurality of the reinforcing ribs (91) are arranged along the length direction of the first side bar (61) and meet with the second side bar (62), and the reinforcing areas (92) are all triangular.

5. The transmission mechanism of the lockstitch sewing machine according to claim 4, wherein the number of the reinforcing ribs (91) is three, and the second side bar (62) is provided with a mounting hole (63) for connecting the crank set (8) at the junction of the three reinforcing ribs (91).

6. The transmission mechanism of a lockstitch sewing machine according to any one of claims 1-5, wherein a counterweight (51) is provided on one side of the eccentric wheel (5), the counterweight (51) protrudes toward the side of the eccentric wheel (5) where the base circle is located along the radial direction of the eccentric wheel, a gap is provided between the counterweight (51) and a connecting rod (7) along the axial direction of the main shaft (2), and a bearing (71) is provided between the connecting rod (7) and the eccentric wheel (5).

7. The transmission mechanism of the lockstitch sewing machine according to claim 6, wherein the weight part (51) is fan-shaped and is provided with a central hole (52) for the spindle (2) to pass through, a plurality of connecting holes (53) extending to the central hole (52) are formed in the outer cambered surface of the weight part (51) along the circumferential direction of the spindle (2), and bolts pass through the connecting holes (53) to enable the eccentric wheel (5) to synchronously rotate along with the spindle (2).

8. The transmission mechanism of a sewing machine according to any one of claims 1-5, further comprising a swing frame (10) rotatably connected to the frame (1), the crank set (8) comprising at least one pair of cranks (81), one end of each of the cranks (81) being hinged to the connecting rod (7), and one end of each of the cranks (81) remote from the connecting rod (7) being hinged to the swing arm (6), and one end of the other crank (81) remote from the connecting rod (7) being hinged to the swing frame (10).

9. The transmission mechanism of the lockstitch sewing machine according to claim 8, wherein the swing frame (10) is provided with a U-shaped yielding groove (101), the crank group (8) comprises two pairs of cranks (81), the two pairs of cranks (81) are all positioned in the yielding groove (101), the swing arm (6) and the connecting rod (7) are all positioned between the two pairs of cranks (81), and the joint of the swing arm (6) and the cranks (81) is positioned at the notch of the yielding groove (101).