CN108611769A - A kind of sewing machine - Google Patents

Abstract

The invention belongs to sewing device technical fields, refer in particular to a kind of sewing machine；Including needle gage regulation stud, regulator shaft and the needle gage adjuster being fixed on regulator shaft, the upper end for the connecting rod of falling feeding is connected on needle gage adjuster, the lower end for the connecting rod of falling feeding is connected in swing seat, swing seat is swung by two positioning pins to be arranged on bottom plate, sliding slot is provided in the middle part of the connecting rod of falling feeding, the one end and sliding slot for backstitching spanner crank are slidably connected, the other end and backstitch spanner axis connection, it backstitches wrench shaft and is connect by backstitching electromagnet crank with electromagnet is backstitched, and backstitch wrench shaft rotation by backstitching solenoid actuated, the middle part of the connecting rod of falling feeding or the middle part for backstitching spanner crank are connect by reset tension spring with bottom plate；This invention simplifies the transmission chains for just backstitching mechanism, simplify complicated Element Design, reduce the processing cost of part.

Description

a sewing machine

Technical field:

The invention belongs to the technical field of sewing equipment, in particular to a sewing machine.

Background technique:

When the lockstitch sewing machine is sewing, at the beginning and end of the seam, reverse stitching is often used to reinforce the sewing material. The structure of the existing sewing machine needle distance forward and reverse sewing switching is as follows (as shown in Figure 1-4): it includes the needle length adjustment stud 1, the adjuster shaft 2 and the stitch length adjuster 3 fixed on the adjuster shaft 2. Described pitch adjuster 3 comprises main body 4, and one end of main body 4 is provided with V-shaped groove 5, and the other end of main body 4 is provided with the crank part 7 that is connected with the upper end of feeding connecting rod 6, and V-shaped groove 5 The lower end of the main body 4 between the crank part 7 is provided with a fork part 8, a chute 9 is provided at the fork part 8, a reverse stitching crank 11 is arranged on the reverse stitching wrench shaft 10, and a reverse stitching crank is arranged on the back stitching crank 11 Pin 12, the backstitch crank pin 12 is arranged in the chute 9 of the stitch length adjuster 3, and the extension spring connecting part 13 for hanging the reset extension spring 14 is also arranged on the back stitch adjuster 11, and one end of the reset extension spring 14 It is hung on the extension spring connection part 13 and the other end is fixed on the bottom plate 15 . The lower end of the reverse feeding connecting rod 6 is connected with the swing seat 16, and the swing seat 16 is connected to the bottom plate 15 by left and right pin rotation, and the swing seat 16, together with the long and short swing plates and the reverse feed connecting rod 17, will connect the upper shaft 18 The driving force is transmitted to the feed shaft 19 . Backtack wrench shaft 10 is connected with backtack electromagnet 20 .

From the above, it can be seen that the stitch length adjuster 3 and the reverse stitching crank 11 in the existing structure are complicated in structure, the processing cost is high, and the transmission chain of the overall structure is redundant and the structure is complicated.

Invention content:

The purpose of the present invention is to provide a sewing machine which simplifies the structure of the parts and simplifies the switching structure of forward and backward stitches.

The present invention is achieved like this:

A sewing machine, comprising a stitch length adjusting stud, an adjuster shaft and a stitch length adjuster fixed on the adjuster shaft, the upper end of the reverse feed link is connected to the stitch length adjuster, and the lower end of the reverse feed link is connected to the swing On the seat, the swing seat is oscillatingly set on the bottom plate through two positioning pins, and a chute is provided in the middle of the reverse feeding connecting rod. The wrench shaft is connected to the back stitching electromagnet through the back stitching electromagnet crank, and the back stitching wrench shaft is driven to rotate by the back stitching electromagnet, and the middle part of the back feeding connecting rod or the middle part of the back stitching wrench crank is connected to the bottom plate through a reset tension spring .

In the above sewing machine, one end of the crank handle of the back stitch wrench is provided with a back stitch crank pin, and the back stitch wrench crank is connected to the chute through the back stitch crank pin, and the back stitch crank pin and the chute can slide mutually.

In the aforesaid sewing machine, one end of the backtack wrench crank is provided with a backtack crank pin hole, one end of the backtack crank pin is connected to the backtack crank pin hole with an interference fit, and the other end is arranged on the backtack wrench slide in the slot.

In the above-mentioned sewing machine, a slider is connected to a side surface adjacent to the reverse feeding connecting rod at one end of the reverse sewing wrench crank through a slider pin, and the slider is arranged in the chute of the reverse feeding connecting rod. The slide block and the chute can slide mutually, and the slide block limits the position of the slide block in the axial direction of the slide block pin through the head of the slide block pin and the reverse feeding connecting rod.

In the above-mentioned sewing machine, one end of the needle distance adjuster is provided with a mounting hole, and the upper end of the reverse feeding connecting rod is provided with a through hole, and the upper end of the reverse feeding connecting rod passes through the mounting hole and the through hole and the needle through the eccentric pin. The needle distance regulator is connected, and the eccentric pin is fixed on the needle distance regulator through the screws arranged radially along the installation hole.

In the above-mentioned sewing machine, an upper extension plate and a lower extension plate extend outward from the middle of the reverse feeding connecting rod toward the left or right, and a chute is formed between the upper extension plate and the lower extension plate.

In the above-mentioned sewing machine, the swing seat is U-shaped, and the inner walls of the outer ends of the two arms of the swing seat are respectively connected with the outer ends of the short swing plates, and the inner ends of the two long swing plates are arranged between the two short swing plates. Between the inner ends, the lower end of the cloth feeding link is set between the inner ends of the two long swing plates, and the lower end of the cloth feeding link, the inner ends of the two short swing plates, and the inner ends of the two long swing plates are fixed on the On the same installation shaft, the upper end of the cloth feeding connecting rod is connected with the upper shaft, and the outer ends of the two long swinging plates are connected with the feeding shaft through the crank of the feeding shaft. The driving force of the shaft is transmitted to the feed shaft.

The outstanding advantages of the present invention compared with prior art are:

The invention simplifies the transmission chain of the forward and backward sewing mechanism, simplifies the design of complicated parts, and reduces the processing cost of the parts.

Description of drawings:

Fig. 1 is the schematic diagram of background technology;

Fig. 2 is the schematic diagram of the backstack wrench crank of background technology;

Fig. 3 is the schematic diagram of the stitch length adjuster of background technology;

Fig. 4 is a schematic diagram of the mechanism of the background technology;

Fig. 5 is a three-dimensional schematic diagram of one of the structures of the present invention;

Figure 6 is a front view of one of the structures of the present invention;

Fig. 7 is the front view of the assembly of some parts of one of the structures of the present invention;

Fig. 8 is a left view of the assembly of some parts of one of the structures of the present invention;

Fig. 9 is a schematic diagram of the stitch length adjuster of the present invention;

Fig. 10 is the schematic diagram of the reverse feeding connecting rod of the present invention;

Fig. 11 is a schematic diagram of the swing seat of the present invention;

Fig. 12 is a mechanism schematic diagram of the present invention;

Fig. 13 is a schematic perspective view of another structure of the present invention;

Fig. 14 is a three-dimensional schematic diagram of the assembly of some parts of another structure of the present invention;

Fig. 15 is a schematic diagram that the slider of the present invention is arranged on the crank of the backstitching wrench through the slider pin;

Fig. 16 is an exploded schematic view showing that the slider of the present invention is arranged on the crank of the backstitching wrench through the slider pin;

Fig. 17 is a schematic diagram of the eccentric pin of the present invention.

In Fig. 1-4: 1. Stitch adjustment stud; 2. Regulator shaft; 3. Stitch adjuster; 4. Main body; 5. V-shaped groove; , fork; 9, chute; 10, back stitch wrench shaft; 11, back stitch wrench crank; 12, back stitch crank pin; 13, extension spring connection; 14, reset extension spring; 15, bottom plate; 16, swing Seat; 17, reverse feeding connecting rod; 18, upper shaft; 19, feeding shaft; 20, backward sewing electromagnet.

Among Fig. 5-15: 21, pitch adjustment stud; 22, adjuster shaft; 23, stitch adjuster; 24, reverse feeding connecting rod; 25, swing seat; 26, positioning pin; 27, chute; 28 , Reversing wrench crank; 29, Reversing wrench shaft; 30, Reversing electromagnet crank; 31, Reversing electromagnet; 32, Reset extension spring; 33, Hanging hole; 34, Reversing crank pin; 35, Slider Pin; 36, slider; 37, head; 38, mounting hole; 39, eccentric pin; 40, head of eccentric pin; 41, first pin shaft; 42, second pin shaft; 43, upper extension plate; 44 , Lower extension plate; 45, Reversed electromagnet connecting rod; 46, Support arm; 47, Short swing plate; 48, Long swing plate; 49, Cloth feeding connecting rod; 50, Upper shaft; 51, Feed shaft crank; 52 , Feeding shaft.

Detailed ways:

The present invention will be further described below with specific examples, see Fig. 5-17:

A sewing machine, comprising a stitch length adjusting stud 21, an adjuster shaft 22 and a stitch length adjuster 23 fixed on the adjuster shaft 22. The adjusting stud 21 is installed in the casing (not shown in the figure) through threaded rotation, and is used for limiting the needle length adjuster 23 . The adjuster shaft 22 is rotatably arranged in the casing, and the stitch length adjuster 23 is fixedly connected with the adjuster shaft 22 and can rotate synchronously with the adjuster shaft 22 . The upper end of the reverse feeding connecting rod 24 is connected on the stitch regulator 23, and the lower end of the reverse feeding connecting rod 24 is connected on the swing seat 25, and the swing seat 25 is swingably arranged on the base plate (not shown in the figure) by two positioning pins 26, A chute 27 is arranged in the middle part of the reverse feed connecting rod 24, and one end of the back stitch wrench crank 28 is movably connected with the chute slide 27, and the other end is connected with the back stitch wrench shaft 29, and the back stitch wrench shaft 29 passes through the back stitch electromagnet crank 30 is connected with back stitching electromagnet 31, and drives back stitching wrench shaft 29 to rotate by back stitching electromagnet 31, and the middle part of described back feeding connecting rod 24 or the middle part of back stitching wrench crank 28 is connected with base plate by reset extension spring 32. In actual use, the specific position where the return tension spring 32 is connected to the bottom plate depends on the space. Back stitch wrench shaft 29 is rotated and arranged in the casing, and back stitch electromagnet 31 is fixedly installed in the casing.

When the reset extension spring 32 was arranged on the middle part of the reverse feeding connecting rod 24, a hanging hole 33 was provided at the middle part of the reverse feeding connecting rod 24, and one end of the reset extension spring 32 was hung in the hanging hole 33; when the reset extension spring 32 was set When in the middle part of back stitching spanner crank 28, spring pin is provided with in the middle part of back stitching spanner crank 28, and one end of reset extension spring 32 is hung on the spring pin.

As shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8, one of the embodiments in which one end of the crank handle 28 of the reverse tacking wrench according to the present invention is slidably connected to the chute 27 is as follows: one end of the crank handle 28 of the back tacking spanner Back stitching crank pin 34 is arranged, and back stitching wrench crank 28 is connected with chute 27 by back stitching crank pin 34, and back stitching crank pin 34 and chute 27 can slide mutually.

Specifically, one end of the backtacking wrench crank 28 is provided with a backtacking crank pin hole, one end of the backtacking crank pin 34 is connected with an interference fit with the backtacking crank pin hole, and the other end is arranged on the chute of the backtacking connecting rod 24 Within 27.

Of course, the crank pin 34 can also be fixed by threaded connection, welding, glue, etc. instead of the interference-fit plug-in connection.

Back stitching wrench crank 28 under the driving of back stitching electromagnet 31, when lifting back feeding connecting rod 24, back stitching crank pin 34 slides in the chute 27 of back feeding connecting rod 24.

As shown in Figures 12-15, another embodiment of the sliding connection between one end of the crank handle 28 of the reverse feed wrench and the chute 27 according to the present invention is as follows: one end of the crank handle 28 of the reverse feed wrench is adjacent to the reverse feeding connecting rod 24 Slider 36 is connected with slider pin 35 on the side, and described slider 36 is arranged in the chute 27 of reverse feeding connecting rod 24, and slider 36 and chute 27 can slide mutually, and slider 36 passes slider pin The head 37 of 35 and the reverse feeding connecting rod 24 limit the slider 36 in the axial direction of the slider pin 35 .

Back stitching wrench crank 28 under the drive of back stitching electromagnet 31, when lifting back feeding connecting rod 24, slide block 36 slides in the chute 27 of back feeding connecting rod 24, can effectively reduce frictional resistance.

Further, as shown in FIG. 9 , one end of the stitch length adjuster 23 is provided with a mounting hole 38 , and the upper end of the reverse feeding connecting rod 24 is provided with a through hole, and the upper end of the reverse feeding connecting rod 24 is installed through an eccentric pin 39 . The hole 38 and the through hole are connected with the stitch length adjuster 23 , and the eccentric pin 39 is fixed on the stitch length adjuster 23 through the screws arranged radially along the installation hole 38 . Compared with the existing stitch length adjuster 23, the structure of the stitch length adjuster 23 of the present invention simplifies the structure, reduces the processing difficulty and reduces the processing cost.

As shown in Figure 17, the eccentric pin 39 of the present invention includes an eccentric pin head 40, a first pin shaft 41 is centrally arranged on one end face of the eccentric pin head 40, and the eccentric pin shaft 41 is eccentrically arranged on the outer end face of the first pin shaft 41. The second pin shaft 42 is provided, the upper end of the reverse feeding connecting rod 24 is arranged on the first pin shaft 41, the second pin shaft 42 is inserted in the mounting hole 38 of the needle distance regulator 23, the second pin shaft 42 It is fixedly connected with the stitch length adjuster 23 by screws. The eccentricity of the axes of the first pin shaft 41 and the second pin shaft 42 is designed according to the actual situation, and the eccentricity of this embodiment is 0.7±0.015mm.

Further, as shown in FIG. 10 , an upper extension plate 43 and a lower extension plate 44 extend outward from the middle of the reverse feeding connecting rod 24 according to the present invention, and an upper extension plate 43 and a lower extension plate 44 are formed between the upper extension plate 43 and the lower extension plate 44. Chute 27.

Compared with the existing design, the present invention also simplifies the structure of the backstitch wrench crank 28, simplifies the structure, reduces the processing difficulty and reduces the processing cost.

Further, the iron core of the back-tack electromagnet 31 according to the present invention is hinged to the back-tack electromagnet crank 30 through the back-tack electromagnet connecting rod 45 . Back stitching electromagnet crank 30 and back stitching wrench crank 28 are fixed on the back stitching wrench shaft 29 at a fixed angle mutually.

Back stitch electromagnet 31 of the present invention also can be replaced with cylinder, electric push rod etc.

In addition, the swing seat 25 of the present invention is U-shaped, and is respectively hinged with the outer ends of the short swing plates 47 on the inner walls of the two arms 46 outer ends of the swing seat 25, and the inner ends of the two long swing plates 48 are arranged on the two short swing plates. Between the inner ends of the plates 47, the lower end of the cloth feeding link 49 is arranged between the inner ends of the two long swing plates 48, and the lower end of the cloth feeding link 49, the inner ends of the two short swing plates 47, the two long swing plates The inner ends of 48 are all fixedly located on the same installation shaft, the upper end of the feeding connecting rod 49 is connected with the upper shaft 50, the outer ends of the two long swing plates 48 are connected with the feeding shaft 52 through the feeding shaft crank 51, and the feeding connecting rod 49 , the swing seat 25 , the long swing plate 48 , and the short swing plate 47 transmit the driving force of the upper shaft 50 to the feeding shaft 52 .

The working principle of the present invention is:

1. When forward sewing, the reverse sewing electromagnet 31 is in the power-off state, and the reset tension spring 32 exerts a downward pulling force on the reverse feeding connecting rod 24, and the reverse feeding connecting rod 24 drives the stitch distance regulator 23 to rotate around the regulator shaft 22 When the lower surface of the V-shaped groove on the stitch length adjuster 23 abuts against the stitch length adjustment stud 21 for a limit, the left and right positions of the stitch length adjustment stud 21 are the current stitch length. The specific principle is the same as that of the stitch length adjusting mechanism of the existing lockstitch sewing machine, and will not be described in detail here.

2. When automatically switching back stitching, the back stitching electromagnet 31 is energized, the iron core of the back stitching electromagnet 31 pushes the back stitching electromagnet connecting rod 45 to the left, and the back stitching electromagnet connecting rod 45 acts on the back stitching electromagnet crank 30 at the same time On, make the back stitching electromagnet crank 30 rotate with the back stitching wrench shaft 28 as the axis, the back stitching electromagnet crank 30 rotates and drives the back stitching wrench crank 28 that is fixed on the back stitching wrench shaft 28 to rotate. At this time, the reverse feed crank pin 34 or slide block 36 that cooperated with the reverse feed connecting rod 24 on the reverse feed seam wrench crank 28 drives the reverse feed rod 24 to move upwards, thereby driving the needle distance regulator 23 to rotate around the regulator shaft 22 until The upper surface of the V-shaped groove on the stitch length adjuster 23 abuts against the stitch length adjusting screw 21 . The above-mentioned complete process realizes the automatic switching from a certain stitch distance of forward sewing to the corresponding stitch distance of reverse sewing.

The above-described embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Therefore: all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the present invention. within the scope of protection.

Claims (7)

1. A sewing machine, comprising a stitch length adjusting stud (21), an adjuster shaft (22) and a stitch length adjuster (23) fixed on the adjuster shaft (22), is characterized in that: the reverse feed connecting rod ( The upper end of 24) is connected to the stitch length adjuster (23), the lower end of the reverse feeding link (24) is connected to the swing seat (25), and the swing seat (25) is swingably arranged on the bottom plate through two positioning pins (26). , a chute (27) is provided in the middle of the reverse feed connecting rod (24), one end of the reverse feed wrench crank (28) is slidingly connected with the chute (27), and the other end is connected with the reverse feed wrench shaft (29). Seam wrench shaft (29) is connected with back stitch electromagnet (31) by back stitch electromagnet crank (30), and is driven back stitch wrench shaft (29) to rotate by back stitch electromagnet (31), and described back feeding connecting rod ( 24) the middle part or the middle part of backstitching wrench crank (28) is connected with base plate by return extension spring (32). 2. A sewing machine according to claim 1, characterized in that: one end of the backtack wrench crank (28) is provided with a backtack crank pin (34), and the backtack wrench crank (28) passes through the backtack crank pin (34) is connected with chute (27), and the reverse sewing crank pin (34) and chute (27) can slide mutually. 3. A kind of sewing machine according to claim 2, characterized in that: one end of the back stitching wrench crank (28) is provided with a back stitching crank pin (34) hole, and one end of the back stitching crank pin (34) is connected with the back stitching crank pin (34) Seam crank pin (34) interference fit connection, the other end is arranged in the chute (27) of reverse sewing wrench. 4. A kind of sewing machine according to claim 1, characterized in that: one end of the reverse sewing wrench crank (28) is connected to a side surface adjacent to the reverse feed connecting rod (24) through a slider pin (35). Slide block (36), described slide block (36) is arranged in the chute (27) of feeding connecting rod (24), slide block (36) and chute (27) can slide mutually, slide block (36) The slider (36) is limited in the axial direction of the slider pin (35) by the head (37) of the slider pin (35) and the reverse feeding connecting rod (24). 5. A kind of sewing machine according to claim 1, characterized in that: one end of the stitch length adjuster (23) is provided with a mounting hole (38), and the upper end of the reverse feeding connecting rod (24) is provided with a through hole, The upper end of the feeding connecting rod (24) passes through the mounting hole (38) through the eccentric pin (39) and is connected with the through hole and the stitch regulator (23), and the eccentric pin (39) passes through the mounting hole (38) The radially arranged screw is fixed on the needle length adjuster (23). 6. A sewing machine according to claim 1, characterized in that: an upper extension plate (43) and a lower extension plate (44) extend outward from the middle of the reverse feeding link (24) toward the left or right ), form a chute (27) between the upper extension plate (43) and the lower extension plate (44). 7. A sewing machine according to claim 1, characterized in that: the swing seat (25) is U-shaped, and the inner walls of the outer ends of the two arms (46) of the swing seat (25) are connected with the short swing plate (47) respectively. ), the inner ends of the two long oscillating plates (48) are arranged between the inner ends of the two short oscillating plates (47), and the lower ends of the feeding link are arranged at the inner ends of the two long oscillating plates (48). between, and the lower end of the cloth feeding link, the inner ends of the two short swing plates (47), and the inner ends of the two long swing plates (48) are all fixed on the same installation shaft, and the upper end of the cloth feeding link and the upper shaft (50) connection, the outer ends of the two long swing plates (48) are connected with the feed shaft (52) by the feed shaft crank (51), through the reverse feed connecting rod (24), swing seat (25), long swing plate (48) ), the short swing plate (47) transmits the driving force of the upper shaft (50) to the feeding shaft (52).