CN203475105U - Large-needle-pitch feeding mechanism of lockstitch sewing machine - Google Patents

Abstract

The utility model provides a large-needle-pitch feeding mechanism of a lockstitch sewing machine. The large-needle-pitch feeding mechanism comprises a feed lifting shaft, a feeding shaft, a feeding mechanism and a feed lifting mechanism, wherein the feeding mechanism and the feed lifting mechanism are arranged between the feed lifting shaft and the feeding shaft. The feed lifting shaft drives a feeding eccentric wheel of the feeding mechanism to drive a feeding connection rod and then drives a feeding swing plate to drive a feeding crank fixed to the feeding shaft to swing, the feeding shaft drives a swing arm of a feed frame pedestal fixed to the lifting shaft; meanwhile, the feed lifting shaft drives a feed lifting eccentric wheel of the feed lifting mechanism to drive a feed lifting drive seat to move; swinging of the swing arm of the feed frame pedestal and moving of the feed lifting drive seat enable feed frames and feeding teeth on the feed frames to do track movements similar to ovals, wherein the feed frames are used for connecting the swing arm of the feed frame pedestal and the feed lifting drive seat. According to the large-needle-pitch feeding mechanism, the length of the swing arm of the feed frame pedestal is 30.47mm, the swing angle is 12.6 degrees, the needle-pitch range of the lockstitch sewing machine can reach 1mm-8mm, and therefore large-needle-pitch sewing can be achieved; in addition, the lockstitch sewing machine is small in vibration and noise and accords with industrial standards, the phenomenon of shaking does not exist in the process of wrench operation; the matching degree of forward needle pitches and backward needle pitches is good.

Description

A feeding mechanism with a large needle pitch for a lockstitch sewing machine

technical field

The utility model relates to the technical field of industrial sewing machines, in particular to a feeding mechanism with a large stitch distance for a locket sewing machine.

Background technique

Industrial sewing machines refer to sewing machines suitable for sewing workpieces for mass production in sewing factories or other industrial sectors, generally using electric motors as the power source. Industrial sewing machines are often specially designed for a specific workpiece or a specific sewing process, and the special type is very strong; industrial sewing machines can sew 1,000-10,000 stitches per minute according to different uses and sewing materials. The production efficiency is high; in addition, the stitches and seams sewn by the industrial sewing machine are firm, uniform, and the sewing quality is good.

Industrial sewing machines mainly include thread take-up mechanism, feeding mechanism, thread hook mechanism, thread take-up lever mechanism, needle bar mechanism, presser foot mechanism, material cutting device, hole opening device, automatic thread pulling device, automatic thread trimming device, automatic needle stop device , Oil suction device, lubrication device and electrical control system.

Lockstitch sewing machine is the most commonly used type of industrial sewing machine. For sewing materials that do not require high seam quality but have a wide seam distance, such as tents, woven bags, shed cloth, etc., generally use a sewing machine that can set a larger stitch distance. Lockstitch sewing machine is used for sewing to increase sewing speed, increase production efficiency, reduce manpower consumption, and reduce production costs. In the prior art, the maximum needle pitch of a lockstitch sewing machine is generally 4.5 mm. With the advancement and development of science and technology, there are currently some lockstitch sewing machines with an average stitch distance of ≥5mm on the market. The average stitch distance of lockstitch machines on the market is ≥5mm by adopting the following two schemes: Scheme 1 1. Increase the eccentricity of the feeding eccentric wheel of the feeding mechanism, thereby increasing the feeding stroke; Option 2, relatively reduce the length of the feeding crank of the feeding mechanism, or expand the needle pitch to adjust the swing angle of the swing seat, thereby increasing the feeding stroke. The disadvantage of option 1 is that it will increase the pressure angle in the feeding mechanism and the interaction force in the mechanism will become larger. Finally, it will be reflected in the whole lockstitch sewing machine that the machine has large vibration and noise. The wrench of the machine has jumping phenomenon. The disadvantage of plan two is that there are also the problems of large vibration, high noise, wrench shaking or inflexibility caused by the increase of pressure angle in plan one. In addition, because the position of zero position in the original mechanism is actually changed, the machine will appear positive seam The phenomenon that the large back stitch is small or the front stitch is small and the back stitch is large, resulting in the mismatch of the stitch length of the front and back stitches.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a lockstitch sewing machine with a large needle that makes the vibration and noise of the whole machine conform to the industry standard, matches the stitch length of forward and reverse stitches, and has a flexible wrench without jumping. From feeding mechanism, to overcome the above-mentioned defective of prior art.

In order to solve the above-mentioned technical problems, the utility model provides a feed mechanism with a large needle pitch of a lockstitch sewing machine, which includes a tooth lifting shaft, a feeding shaft, and a feeding adjustment shaft parallel to each other; the connection between the tooth lifting shaft and the feeding shaft A tooth lifting mechanism is arranged between; a feeding mechanism is arranged between the tooth lifting shaft, the feeding shaft and the feeding adjustment shaft;

The tooth lifting mechanism includes a tooth lifting eccentric fixed to the tooth lifting shaft, a tooth lifting drive seat arranged on the outer edge of the tooth lifting eccentric, fixed on the feeding shaft and driven with the tooth lifting A tooth frame seat opposite to the tooth frame seat, the tooth frame seat includes a swing arm, a tooth frame is connected between the top of the tooth lifting drive seat and the end of the swing arm of the tooth frame seat, the tooth frame There is a feed tooth on the top;

The feeding mechanism includes a feeding eccentric wheel fixed on the tooth lifting shaft, a stitch adjustment swing seat fixed on the feeding adjustment shaft, a feeding crank fixed on the feeding shaft, and two sets of feeding swings plate, a feeding connecting rod; one end of the feeding connecting rod is provided with an assembly ring, and the fitting ring at one end of the feeding connecting rod is matched with the outer edge of the feeding eccentric wheel, and the other end of the feeding connecting rod is connected with two groups of One end of the feeding oscillating plate is hinged, the other end of one group of the feeding oscillating plate is hinged with the feeding crank, and the other end of the other group of the feeding oscillating plate is hinged with the needle pitch adjusting oscillating seat;

The rotation of the tooth lifting shaft drives the rotation of the tooth lifting eccentric wheel and the feeding eccentric wheel, and the tooth lifting eccentric wheel drives the tooth frame to move through the tooth lifting mechanism; at the same time, the feeding eccentric wheel passes through the The feeding mechanism also drives the tooth frame to move; the combination of the two makes the feeding tooth move in an ellipse-like trajectory.

Preferably, the needle distance provided by the feed dog ranges from 1 mm to 8 mm.

Preferably, the needle pitch provided by the feed dog is 6.2 mm, the swing angle of the feed shaft driven by the feed eccentric wheel is 12.6°, the swing arm length of the bracket seat is 30.47 mm, the The swing arm length of the feed crank is 18mm.

Preferably, there are two feed swing plates in each group, and a set of two feed swing plates hinged to the feed crank clamps the feed crank in the middle; The other set of two hinged feeding swing plates are respectively arranged on the inner sides of the two side walls of the stitch adjustment swing seat.

Preferably, a bearing is provided between the tooth lifting eccentric wheel and the tooth lifting driving seat, and a bearing is provided between the assembly ring of the feeding connecting rod and the feeding eccentric wheel.

Preferably, the tooth lifting eccentric and the feeding eccentric are arranged at 180° on the tooth lifting shaft.

As mentioned above, the large needle pitch feeding mechanism of the lockstitch sewing machine of the utility model has the following beneficial effects:

The swing angle of the feed shaft driven by the feeding eccentric wheel is 12.6°, compared with the feed shaft swing angle of 12.38° in the prior art feeding mechanism, the swing angle is only increased by 0.22°, which can be regarded as the same swing angle , reflected in the feeding mechanism of the utility model, that is, the trajectory of the feeding mechanism is unchanged, so that the pressure angle does not increase, and the interaction force received in the mechanism is avoided from becoming larger, thereby adopting the lockstitch sewing machine of the utility model The machine with large needle pitch feeding mechanism has low vibration and low noise, and meets the industry standard within the specified speed (3000rpm), and the lockstitch sewing machine wrench is flexible to operate without shaking phenomenon; because the swing arm length of the bracket seat is 30.47mm, It is much longer than the swing arm of the prior art, which is 24mm longer. Therefore, the needle distance can reach 1mm to 8mm. For sewing materials that do not require high stitches but have a wider seam distance, the utility model greatly improves the sewing efficiency. Speed and production efficiency reduce manpower consumption and reduce production costs. In addition, because the utility model guarantees the position of the zero position in the mechanism, the utility model can ensure that the needle distances of forward and reverse stitches at each needle position are all matched.

Description of drawings

Fig. 1 shows a schematic structural view of a large stitch feeding mechanism of a lockstitch sewing machine of the present invention.

Fig. 2 is a schematic diagram showing the arrangement of the feeding crank and the bracket seat relative to the feeding shaft of the large needle pitch feeding mechanism of a lockstitch sewing machine of the present invention.

Component designation description

1 Feeding eccentric wheel

2 tooth lifting drive seat

2a bearing

3 Lifting tooth eccentric wheel

4 tooth frame

5 Feeding adjustment shaft

6 Feeding connecting rod

6a bearing

7 Stitch adjustment swing seat

8 Feeding swing plate

9 Feed crank

10 feeding shaft

11 dental bracket

12 feed teeth

13 Lifting shaft

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

Please refer to Figure 1 to Figure 2. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the utility model Therefore, it has no technical substantive meaning. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of The technical content disclosed by the utility model must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

As shown in FIG. 1 , the utility model provides a feed mechanism with a large needle pitch for a lockstitch sewing machine, which includes a tooth lifting shaft 13 , a feeding shaft 10 , and a feeding adjustment shaft 5 parallel to each other. A tooth lifting mechanism is provided between the tooth lifting shaft 13 and the feeding shaft 10 ; a feeding mechanism is provided between the tooth lifting shaft 13 , the feeding shaft 10 and the feeding adjustment shaft 5 .

The tooth-lifting mechanism includes a tooth-lifting eccentric wheel 3 fixed on the tooth-lifting shaft, a tooth-lifting drive seat 2 arranged on the outer edge of the tooth-lifting eccentric wheel 3, fixed on the feeding shaft 10 and connected to the A tooth frame seat 11 opposite to the tooth frame seat 2 is described. The tooth frame seat 11 includes a swing arm, and the top end of the tooth frame drive seat 2 is connected to the end of the swing arm of the tooth frame seat 11. There is a tooth frame 4, and a feed dog 12 is arranged on the top of the tooth frame; wherein, a bearing 2a is provided between the tooth lifting eccentric wheel 3 and the tooth lifting driving seat 2.

The feeding mechanism includes a feeding eccentric wheel 1 fixed on the lifting shaft, a stitch adjustment swing seat 7 fixed on the feeding adjustment shaft 5, a feeding crank 9 fixed on the feeding shaft 10, and It includes two sets of feeding oscillating plates 8 and a feeding connecting rod 6; one end of the feeding connecting rod 6 is provided with an assembly ring, and the assembly ring at one end of the feeding connecting rod 6 is matched with the outer edge of the feeding eccentric wheel 1, so that The other end of the feeding connecting rod 6 is hinged with one end of two groups of the feeding oscillating plates 8 through a pin shaft (not shown in the figure), and the other end of one group of the feeding oscillating plates 8 is through a pin shaft (not shown in the figure). not shown) is hinged with the feed crank 9, and the other end of the other set of feed swing plates 8 is hinged with the stitch adjustment swing seat 7 through a pin shaft (not shown in the figure). Wherein, a bearing 6a is provided between the assembly ring of the feeding connecting rod 6 and the feeding eccentric wheel 1 . Each group of said feeding swing plates 8 is two pieces, and said feed crank 9 is sandwiched between said feed crank 9 by a group of two said feed swing plates 8 hinged with said feed crank 9; The other set of two feeding oscillating plates 8 hinged by the seat 7 are respectively arranged on the inner sides of the two side walls of the stitch adjustment oscillating seat 7 .

The tooth-lifting eccentric wheel 3 and the feeding eccentric wheel 1 of the utility model are arranged at 180° on the tooth-lifting shaft 13 . The needle distance provided by the feed dog 12 ranges from 1 mm to 8 mm.

The needle pitch provided by the feeding tooth 12 of the present utility model is preferably 6.2 mm, and the swing angle of the feeding shaft 10 under the driving of the feeding eccentric wheel 1 is 12.6°, and the swing arm of the bracket seat 11 The length is 30.47mm, and the length of the swing arm of the feeding crank 9 is 18mm.

The working principle of the large pitch feeding mechanism of the lockstitch sewing machine of the present utility model is: the rotation of the tooth-lifting shaft 13 drives the rotation of the tooth-lifting eccentric wheel 3 and the feeding eccentric wheel 1, because the tooth-lifting eccentric wheel 3 and the The center line of the feeding eccentric wheel 1 is not coaxial with the axis line of the tooth lifting shaft 13, and the feeding eccentric wheel 1 drives the tooth frame 4 to move through the feeding mechanism: the feeding eccentric wheel 1 The feeding connecting rod 6 is driven by the bearing 6a to move mainly horizontally, the feeding connecting rod 6 drives the feeding swinging plate 8 hinged thereto, and the feeding swinging plate 8 drives the feeding swinging plate 8 The feed crank 9 swings around the feed shaft 10, because the feed crank 9 is fixed with the feed shaft 10, so the feed crank 9 drives the feed shaft 10 to swing, and the bracket seat 11 fixed on the feed shaft 10 follows the The swing of the feeding shaft 10 causes the swing arm of the tooth frame seat 11 to drive the tooth frame 4 to move mainly horizontally. Simultaneously, the tooth-lifting eccentric wheel 3 drives the tooth frame 4 to move through the tooth-lifting mechanism: the tooth-lifting eccentric wheel 3 drives the tooth-lifting driving seat 2 to move through the bearing 2a, the tooth The frame 4 mainly moves up and down along with the tooth lifting drive base 2 . The combination of the two makes the feed dog 12 move along with the rack 4 in an ellipse-like trajectory.

It can be seen that the swing angle of the swing arm of the tooth frame base 11 (that is, the swing angle of the feeding shaft 10 ) and the length of the swing arm of the tooth frame base 11 determine the stroke of the feed dog.

We define the length of the swing arm of the bracket base 11 as L, the swing angle of the swing arm of the bracket base 11 as θ, and the needle pitch as T, then L×θ=T×K (where K is an empirical coefficient, generally K =1.05～1.2).

In the present utility model, preferably, T=6.2mm, L=30.47mm, another K=1.08,

Then θ=T×K/L=6.2mm×1.08/30.47mm=0.22⌒=12.6°.

The θ angle of the utility model is 12.6 °, compared with the θ angle of 12.38 ° of the feeding mechanism of the prior art, it can be regarded as the same angle, that is, the large needle distance feeding mechanism of the lockstitch sewing machine of the utility model is different from that of the prior art Compared with the feeding mechanism of the present invention, the pressure angle does not increase, so the utility model is the same as the feeding mechanism of the prior art, and the interaction force received does not increase, so that the machine has small vibration and low noise, and meets the requirements within the specified speed (3000rpm). Industry standard, and the lockstitch machine wrench is flexible to operate without shaking. Compared with the maximum needle distance of 4.5mm in the prior art, the needle distance of the utility model can reach 1mm to 8mm. For sewing materials with low requirements for sewing stitches and wide seam distance, the utility model greatly improves the sewing efficiency. Speed and production efficiency reduce manpower consumption and reduce production costs.

It should be noted that the size of L is not randomly selected. As shown in FIG. 1 , the stitch length adjustment swing seat 7 corresponds to a zero position, and the corresponding stitch length is 0 at this zero position. And under other needle positions, the needle pitch adjustment swing seat 7 deviates from the zero position to both sides respectively when forward and backward stitching. Under the same needle position, when forward and backward sewing, the swing angle of the needle pitch adjustment swing seat 7 relative to the zero position should be similar. This can ensure that the pressure angles are approximately equal during forward and backward sewing, otherwise there will be large vibrations during forward or reverse sewing. By rotating the feed adjustment shaft 5 with a wrench, the needle pitch is adjusted to adjust the swing of the swing seat 7 and the feed swing plate 8. The larger the swing, the larger the needle pitch.

As mentioned above, the zero position is a very important position, in order to make the utility model not change the zero position of the prior art, there must be such a constraint condition: the feed shaft 10 must be positioned on the swing track of the feed crank 9 when the zero position. Thereby, as shown in Figure 2, the point A place is the hinge point between the feed crank 9 and the feed swing plate 8 when the feed crank 9 is in the zero position, the point B place is the axis of the feed shaft 10 of the present utility model, and the point C place is the prior art The shaft center of the feeding shaft, the point D place is the connecting point position of tooth frame seat 11 and tooth frame 4 when zero position. As can be seen from Fig. 2, the large needle pitch feeding mechanism of the lockstitch sewing machine of the utility model is the same as the zero position of the feeding mechanism of the prior art, so that the stitch pitches of the utility model are all matched at each needle position.

To sum up, the angle at which the feeding eccentric wheel drives the feeding shaft of the large stitch feed mechanism of the lockstitch sewing machine of the present utility model to swing is 12.6°, compared with the swing angle of 12.38° of the prior art feeding mechanism , the pressure angle does not increase, so the utility model is the same as the feeding mechanism of the prior art, and the interaction force received does not increase, so that the machine has small vibration and low noise, and meets the industry standard within the specified speed (3000rpm), and is flat The sewing machine wrench can be operated flexibly without shaking. Compared with the maximum needle distance of 4.5mm in the prior art, the needle distance of the utility model can reach 1mm to 8mm. For sewing materials with low requirements for sewing stitches and wide seam distance, the utility model greatly improves the sewing efficiency. Speed and production efficiency reduce manpower consumption and reduce production costs. In addition, because the utility model guarantees the position of the zero position in the mechanism, the utility model can ensure that the needle distances of forward and reverse stitches at each needle position are all matched. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (6)

1. A feeding mechanism with a large needle pitch for a lockstitch sewing machine, comprising a tooth-lifting shaft (13), a feeding shaft (10), and a feeding adjustment shaft (5) parallel to each other; it is characterized in that the tooth-lifting shaft ( 13) A tooth lifting mechanism is provided between the feeding shaft (10); a feeding mechanism is provided between the tooth lifting shaft (13), the feeding shaft (10) and the feeding adjustment shaft (5); The tooth-lifting mechanism includes a tooth-lifting eccentric wheel (3) fixed on the tooth-lifting shaft, a tooth-lifting drive seat (2) arranged on the outer edge of the tooth-lifting eccentric wheel (3), fixed on the The feeding shaft (10) and a tooth frame seat (11) opposite to the tooth lifting drive seat (2), the tooth frame seat (11) includes a swing arm, and the top end of the tooth lifting drive seat (2) A tooth frame (4) is connected between the end of the swing arm of the tooth frame seat (11), and a feeding tooth (12) is arranged above the tooth frame; The feeding mechanism includes a feeding eccentric wheel (1) fixed on the tooth lifting shaft, a needle pitch adjustment swing seat (7) fixed on the feeding adjustment shaft (5), a stitch adjustment swing seat (7) fixed on the feeding shaft (10 ) of a feeding crank (9), also includes two sets of feeding swing plates (8), a feeding connecting rod (6); one end of the feeding connecting rod (6) is provided with an assembly ring, and the feeding connecting rod (6 ) The assembly ring at one end is matched with the outer edge of the feeding eccentric wheel (1), and the other end of the feeding connecting rod (6) is hinged with one end of two groups of the feeding swinging plates (8), one of which is The other end of the feeding oscillating plate (8) is hinged to the feeding crank (9), and the other end of the other group of feeding oscillating plates (8) is hinged to the stitch adjustment oscillating seat (7); The rotation of the tooth lifting shaft (13) drives the rotation of the tooth lifting eccentric wheel (3) and the feeding eccentric wheel (1), and the tooth lifting eccentric wheel (3) drives the tooth frame through the tooth lifting mechanism (4) moving; at the same time, the feeding eccentric wheel (1) also drives the tooth frame (4) to move through the feeding mechanism; the combination of the two makes the feeding tooth (12) move in an elliptical trajectory. the 2. The large needle pitch feeding mechanism of a locket sewing machine according to claim 1, characterized in that: the needle pitch provided by the feed dog (12) ranges from 1 mm to 8 mm. the 3. The feeding mechanism with large needle pitch for locket sewing machine according to claim 2, characterized in that: the needle pitch provided by the feed dog (12) is 6.2mm, and the feed shaft (10) is positioned at the center of the feed eccentric The swing angle driven by (1) is 12.6°, the swing arm length of the bracket seat (11) is 30.47mm, and the swing arm length of the feeding crank (9) is 18mm. the 4. The feeding mechanism with large needle pitch of lockstitch sewing machine according to claim 1, characterized in that: each group of said feeding swing plates (8) is two pieces, and a group hinged with said feeding crank (9) The two feeding swinging plates (8) sandwich the feeding crank (9) in the middle; the other set of two feeding swinging plates (8) hinged with the stitch adjustment swinging seat (7) They are respectively arranged on the inner sides of the two side walls of the needle distance adjusting swing seat (7). the 5. The feeding mechanism of lockstitch sewing machine with large needle pitch according to claim 1, characterized in that: a bearing (2a) is provided between the tooth-lifting eccentric wheel (3) and the tooth-lifting driving seat (2), A bearing (6a) is provided between the assembly ring of the feeding connecting rod (6) and the feeding eccentric wheel (1). the 6. The feeding mechanism with large needle pitch of lockstitch sewing machine according to claim 1, characterized in that: the tooth lifting eccentric wheel (3) and the feeding eccentric wheel (1) are on the tooth lifting shaft (13) Arranged at 180°. the

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