TWM455024U - Switching device for forward sewing and backward sewing (reverse stitching) of sewing machine and joint spacing regulation mechanism thereof - Google Patents

Description

Front and back seam switching device for sewing machine and seam adjusting mechanism thereof

The present invention relates to a forward and reverse seam switching device, and more particularly to a forward and backward seam switching device for a sewing machine and a seam adjusting mechanism thereof.

A forward and reverse seam switching device for a conventional sewing machine, as disclosed in Japanese Patent Publication No. 258224, which mainly includes a slit adjusting mechanism, a return needle control shaft table, a crank, a driven member and a turning mechanism. The slit adjusting mechanism has a slit screw, and the driven member has a pair of abutting surfaces arranged in an up-and-down relationship, the pair of abutting surfaces are correspondingly arranged with the end of the slit screw, and protruded below the abutting surface. The utility model has an extending arm, wherein the two ends of the crank are respectively connected to the driven member and the return needle control shaft table, the turning mechanism has a trigger handle, a rotating rod and a linking member, and the trigger and the linking member are connected at the two ends of the rotating rod, and are linked The piece corresponds to the extension arm of the driven member for toggle switching, so that the slit screw and the abutting surface are selectively abutted.

However, the forward and reverse seam switching device for the conventional sewing machine can perform the transformation of the forward and reverse seams, but the abutting faces of the driven members and the direction of the force of the extending arms are all on the same plane, which not only adjusts the slit screw. The feed is cumbersome, and the adjusted seam distance is often caused by the problem of the direction of the force, and the gap is unstable and the turning mechanism is seriously shaken. Each abutting surface of the driven member is limited by the space, and the arc length is relatively short, so the subdivision of the stitch length is restricted and the seam is made The accuracy of the distance is poor, and it is urgent to improve.

An object of the present invention is to provide a forward and backward seam switching device for a sewing machine and a slit adjusting mechanism thereof, which can make the adjustment of the sewing pitch easier and more stable by changing the direction of the force of the slit cam.

In order to achieve the above object, the present invention provides a forward and reverse seam switching device for a sewing machine, the sewing machine having a body, the forward and backward seam switching device including a slit adjusting mechanism, a switching mechanism and a turning mechanism, a slit adjusting mechanism is mounted on the body, and includes a shaft, a slit cam and a knob, the shaft is connected to the body; the slit cam is sleeved on the shaft and follows the rotation, the pitch The cam has a cylindrical body and a guide rail extending outward from a radial periphery of the cylindrical body, the cylindrical body defining an axial line defining a central section, the central section and the axial line being perpendicular to each other Having a pair of abutting faces symmetrical with each other on the two sides of the guide rail, the inner angle of the abutting surface and the central section is an acute angle; the knob is coupled to the shaft and formed on the shaft An external part of the body; the switching mechanism is disposed on the side of the body corresponding to the slit cam, the switching mechanism includes a rod connected to the body and a switch sleeved on the rod, the switching device Corresponding to each of the abutting surfaces, a pair of abutting rods and a push rod disposed opposite to the abutting rods; the pivoting mechanism includes a rotating rod connected to the body, respectively connected to a trigger and a dialing member of the rotating rod, the rotating rod and the rotating member are rotated according to the triggering member, and the rotating member is correspondingly switched by the pushing rod, so that the abutting rod Abut against the abutting surface.

In order to achieve the above object, the present invention provides a slit adjustment mechanism for a forward and backward seam switching device, comprising a fixing base, a shaft rod, a slit cam and a knob, the fixing seat defines a shaft hole; the shaft rod wears Connecting the shaft hole; the slit cam is sleeved on the shaft and follows the rotation, and the slit cam has a cylindrical body and a guide rail extending outward from a radial periphery of the cylindrical body, the cylindrical body defining An axial line defining a central cross section, the central cross section and the axial line being perpendicular to each other, and having a pair of abutting faces symmetrical with each other on the two sides of the guide rail on the both sides of the guide rail, the abutting The inner angle of the face and the central section is an acute angle; the knob is coupled to the shaft and formed outside the mount.

The creation also has the following effects. Since the track has a sufficient arc length to be set as the abutting surface, the slit pitch can be refined to make the seam pitch more precise. In addition, the positioning of the positioning assembly is utilized so that the position of the slit cam can be stably held. Moreover, by the setting of the limit component, the collision problem between the transmission elements caused by the excessive sewing pitch can be avoided.

1‧‧‧Sewing distance adjustment mechanism

10‧‧‧ Fixed seat

11‧‧‧ disc

12‧‧‧ bracket

121‧‧‧ front board

122‧‧‧ Back panel

123‧‧‧Transverse arm

13‧‧‧Axis hole

14‧‧‧Perforation

15‧‧‧Blind hole

20‧‧‧ shaft

30‧‧‧Sewing cam

31‧‧‧Cylinder

311‧‧‧Axis line

32‧‧‧rails

321‧‧‧ center profile

322, 323‧‧‧ abutment

324‧‧‧ inside angle

40‧‧‧ knob

41‧‧‧ hole

50‧‧‧ Positioning components

51‧‧‧Helical spring

52‧‧‧Locating pin

55‧‧‧Limited components

551‧‧‧ collar

552‧‧‧fixed pin

553‧‧‧Block arm

6‧‧‧Switching mechanism

61‧‧‧ rod body

62‧‧‧Switcher

621‧‧‧Base

622, 623‧‧‧ abutment rod

624‧‧‧Putting

625‧‧‧ Short sales

7‧‧‧Turning mechanism

71‧‧‧Rot

72‧‧‧ wrench

73‧‧‧3⁄2

731‧‧‧arm

8‧‧‧Sewing machine

81‧‧‧ body

82‧‧‧First bushing

83‧‧‧Second bushing

85‧‧‧Gear transmission

The first figure is an exploded view of the sewing pitch adjustment mechanism.

The second figure is an exploded perspective view of another perspective of the original stitch adjustment mechanism.

The third picture is a schematic diagram of the development of the guide rail of this creation.

The fourth picture is a schematic diagram of the combination of the original reverse stitching device and the body.

The fifth figure is a combination diagram of the original reverse stitching device of the present invention.

The sixth figure is an exploded perspective view of the original reverse stitching device of the present invention.

The seventh figure is the use state diagram (1) of the original reverse seam switching device combined with the feeder transmission device.

The eighth figure is a top view of the seventh figure.

The ninth figure is the use state diagram (2) of the original reverse seam switching device combined with the feeder transmission device.

The tenth figure is a top view of the ninth figure.

The detailed description and technical content of the present invention are described below with reference to the drawings, but the drawings are only for reference and explanation, and are not intended to limit the creation.

Referring to the first to third figures, the present invention provides a forward and backward seam switching device for a sewing machine and a pitch adjusting mechanism thereof, wherein the slit adjusting mechanism 1 includes a fixing base 10, a shaft 20, and a slit cam. 30 and a knob 40.

The fixing base 10 can be made of cast iron or plastic material, and has a disc 11 and a bracket 12. The bracket 12 has a substantially U-shape, and comprises a front plate 121 connected to the rear end surface of the disc 11 to form A rear plate 122 behind the front plate 121 and a lateral arm 123 connecting the front plate 121 and the rear plate 122 are formed with a shaft hole penetrating the disk 11, the front plate 121 and the rear plate 122 at the center of the disk 11. 13. In addition, a plurality of through holes 14 and a blind hole 15 are provided at the edge of the disk 11, and the through holes 14 are provided for fixing components such as screws to fix and fix the fixing base 10 on the sewing machine body 81 (as shown in the fourth figure). ).

The shaft 20 is a rotating rod made of a metal material and is inserted into the aforementioned shaft hole 13.

The slit cam 30 is sleeved between the shaft 20 and formed between the front plate 121 and the rear plate 122 of the fixed seat 10. The slit cam 30 has a cylindrical body 31 and extends outward from the radial periphery of the cylindrical body 31. A guide rail 32 is formed. The cylindrical body 31 is sleeved on the shaft 20 and is fixed to the shaft 20 by screws so that the slit cam 30 follows the shaft 20. The cylindrical body 31 defines an axial line 311, and the guide rail 32 defines a central section 321 which is perpendicular to the axial line 311 of the cylindrical body 31 (as shown in the third figure) on both sides of the guide rail 32. The pair of abutting surfaces 322 and 323 having the center section 321 as a reference and symmetrical to each other, the abutting surfaces 322 and 323 of the present embodiment are developed as an inclined surface, and the abutting surfaces 322 and 323 and the central section 321 are respectively The clip is provided with an inner angle 324, which is an acute angle.

The knob 40 is connected to the end surface of the shaft 20 and formed outside the fixing base 10. The knob 40 is provided with a plurality of insertion holes 41 corresponding to the end surface of the disk 11, and the holes 41 are ringed at equal radius and at equal intervals. Arranged in a shape.

The slit adjustment mechanism 1 of the present invention further includes a positioning assembly 50 including a coil spring 51 and a positioning pin 52. The coil spring 51 is received in the blind hole 15, and the positioning pin 52 is passed through the blind hole 15 and The coil spring 51 is elastically biased, and the end of the positioning pin 52 away from the coil spring 51 is selectively engageable with the fitting hole 41.

The seam adjusting mechanism 1 of the present invention further includes a limiting component 55, which comprises a ring 551 and a fixing pin 552. The collar 551 extends out of a blocking arm 553, and the fixing pin The rotation area of the corresponding arm 553 is fixed on the outer side of the rear plate 122, and the collar 551 is sleeved at the end of the shaft 20 and fixed by screws, so that the collar 551 follows the shaft 20 for rotation, and the fixing pin 552 is fixed. It is used to limit the rotational orientation of the 553 arm.

Referring to the fourth to sixth figures, the present invention provides a forward and backward seam switching device for a sewing machine, which includes a slit adjusting mechanism 1, a switching mechanism 6 and a turning mechanism 7, the sewing machine 8 having a body 81.

In addition to the above-described embodiment, the slit adjusting mechanism 1 may be omitted from the above-described fixing base 10, and a shaft hole (not shown) through which the shaft 20 is inserted may be directly formed on the body 81. The foregoing embodiment is to place the fixing base 10 on the body 81 by screwing through the through holes 14 of the disk 11.

The switching mechanism 6 is disposed on the body 81 corresponding to the side of the slit cam 30. The switching mechanism 6 includes a rod body 61 and a switch 62. One end of the rod body 61 is fixedly connected to the body 81, and the other end is transmitted through a first A bushing 82 is fastened to the body 81. The switch 62 is pivotally disposed at an intermediate portion of the rod body 61 and formed at a side of the slit cam 30. The switch 62 includes a base 621, a pair of abutting rods 622, 623, a push rod 624 and a Short sales 625. Each of the abutting rods 622 and 623 is inserted into the base 621 and parallel to each other. The abutting rods 622 and 623 are disposed on the guide rail 32 so as to be disposed corresponding to the respective abutting surfaces 322 and 323. The push rod 624 is inserted into the base 621 in parallel with the respective abutting rods 622 and 623, but extends in opposite directions from the respective abutting rods 622 and 623. The short pin 625 is inserted into the base 621 in parallel with the push rod 624 and is disposed in the same direction as the push rod 624.

The turning mechanism 7 is mounted on the body 81 corresponding to one side of the switching mechanism 6. The turning mechanism 7 includes a rotating rod 71, a trigger 72 and a dialing member 73. The rotating rod 71 is disposed through a second sleeve 83. The lever 81 is pivotally connected to the body 81, and the trigger 72 and the dial 73 are respectively fixed to the two ends of the rotating rod 71. The trigger 72 is formed on the outer side of the body 81, and the dial 73 extends corresponding to the push rod 624. An arm portion 731 is disposed, the rotating rod 71 and the dialing member 73 are rotated by following the trigger 72, and the dialing member 73 is toggled by the arm portion 731 to the push rod 624, so that the abutting rods are respectively 622 and 623 are selectively attached to the abutting surfaces 322 and 323.

Referring to Figures 7 and 8, the sewing machine 8 further includes a feeder transmission 85 which is connected to the feeder transmission 85 by the aforementioned short pin 625 when the forward sewing is to be performed (forward car) Slot), the knob 40 is first rotated to the seam pitch of the desired sewing seam, and the positioning pin 52 of the positioning assembly 50 is inserted into the fixing hole corresponding to the insertion hole 41 of the knob 40, so that the shaft 20 and the slit cam 30 are Keeping in the predetermined position, at this time, since the connecting rod (not labeled) of the feeding gear 85 is subjected to the pulling force of the tension spring (not labeled), the connecting rod is driven to be displaced upward, and the short pin 625 is driven by the rod 61. The center of rotation drives the base 621 to rotate clockwise, and the abutting rod 622 on the left side and the abutting surface 322 on the left side abut each other, so that the sewing operation for forward sewing can be performed.

Please refer to the ninth and tenth views. On the contrary, when the reverse sewing is to be performed, the trigger 72 is pressed downward to drive the rotating lever 71 and the dial 73 to rotate together, and the arm portion 731 of the dial 73 is used. Pushing the push rod 624, the push rod 624 will rotate in the counterclockwise direction with the rod body 61 as the center of rotation. At this time, the right abutting rod 623 and the right abutting surface 323 will abut each other, and the feeder will be driven. Connection of device 85 The rod moves downwardly, thereby causing the feed of the feeder drive 85 (not shown) to move in the opposite direction.

In summary, the forward and reverse seam switching device and the seam adjustment mechanism of the sewing machine of the present invention can achieve the intended purpose of use, and solve the lack of conventional knowledge, and completely meet the novelty due to the novelty and the progressiveness. The patent application requirements are filed in accordance with the Patent Law. Please check and grant the patent in this case to protect the rights of the creator.

1‧‧‧Sewing distance adjustment mechanism

10‧‧‧ Fixed seat

11‧‧‧ disc

12‧‧‧ bracket

121‧‧‧ front board

122‧‧‧ Back panel

123‧‧‧Transverse arm

13‧‧‧Axis hole

14‧‧‧Perforation

15‧‧‧Blind hole

20‧‧‧ shaft

30‧‧‧Sewing cam

31‧‧‧Cylinder

32‧‧‧rails

322, 323‧‧‧ abutment

40‧‧‧ knob

50‧‧‧ Positioning components

51‧‧‧Helical spring

52‧‧‧Locating pin

55‧‧‧Limited components

551‧‧‧ collar

553‧‧‧Block arm

Claims (10)

A forward and reverse seam switching device for a sewing machine, the sewing machine having a body, the forward and backward seam switching device comprising: a slit adjusting mechanism mounted on the body, comprising: a shaft rod, which is connected to the body; a cam that is sleeved on the shaft and follows the rotation, the slit cam having a cylindrical body and a guide rail extending outward from a radial periphery of the cylindrical body, the cylindrical body defining an axial line, The guide rail defines a central cross section, and the central cross section and the axial line are perpendicular to each other, and a pair of abutting surfaces symmetrical with each other on the two sides of the guide rail are symmetrical on the two sides of the guide rail, and the abutting surface and the central cross section The inner angle is an acute angle; and a knob is coupled to the shaft and formed outside the body; a switching mechanism is disposed on the side of the body corresponding to the slit cam, and the switching mechanism includes a connection to the body a lever body and a switch that is sleeved on the lever body, the switch has a pair of abutting rods respectively disposed corresponding to the abutting surfaces, and a push rod disposed opposite to each of the abutting rods And a turning mechanism, Included in a rotating rod connected to the body, respectively connected to a trigger of the rotating rod and a dialing member, the rotating rod and the rotating member are rotated according to the trigger, the pair of the rotating member It should be switched by the push rod so that the abutment rod abuts against the abutting surface. The forward and reverse seam switching device for a sewing machine according to claim 1, wherein the slit adjusting mechanism further comprises a fixing base fixed to the body, the shaft The rod is connected to the body through the fixing seat. The forward and reverse seam switching device for a sewing machine according to claim 2, wherein the fixing base has a disc and a bracket, and the bracket includes a front panel attached to a rear side of the disc, and is formed at a rear of the front panel A rear plate and a lateral arm connecting the front plate and the rear plate, the slit cam being formed between the front plate and the rear plate. The forward and reverse seam switching device for a sewing machine according to claim 3, wherein the slit adjusting mechanism further comprises a positioning component, the disc is provided with a blind hole, and the knob is provided with a plurality of perforations arranged in an annular shape, the positioning The assembly includes a coil spring and a positioning pin. The coil spring is received in the blind hole. The positioning pin passes through the blind hole and is elastically resisted by the coil spring. The positioning pin is corresponding to the end of the coil spring. Each of the holes is embedded in a fixed position. The forward and reverse seam switching device for a sewing machine according to claim 3, wherein the slit adjusting mechanism further comprises a limiting component, the limiting component comprises a ring and a fixing pin, and the collar is sleeved and fixed The shaft has a baffle extending at a periphery of the collar, and the fixing pin is fixed to the rear plate corresponding to the swivel area of the baffle to limit the rotational orientation of the baffle. The forward and reverse seam switching device for a sewing machine according to claim 1, wherein the switch further comprises a base, each of the abutting rods being spaced apart from the base and parallel to each other, the push rod being parallel to each The abutting rod is inserted on the base, and the dialing member extends an arm portion corresponding to the push rod, and the dialing member is configured to move the push rod by the arm portion. A slit adjustment mechanism for a forward and backward seam switching device includes: a fixing seat having a shaft hole; and a shaft rod piercing the shaft hole; a slit cam that is sleeved on the shaft and follows the rotation, the slit cam having a cylindrical body and a guide rail extending outward from a radial periphery of the cylindrical body, the cylindrical body defining an axial line The guide rail defines a central cross section, the central cross section and the axial line are perpendicular to each other, and a pair of abutting surfaces on the both sides of the guide rail symmetrical with each other on the basis of the central cross section, the abutting surface and the center The inner angle of the profile is an acute angle; and a knob is coupled to the shaft and formed outside the mount. The slit adjusting mechanism of the forward-backlash switching device according to claim 7, wherein the fixing base has a disc and a bracket, and the bracket includes a front panel connected to the back of the disc, and is formed on the front panel a rear plate and a lateral arm connecting the front plate and the rear plate, the shaft hole penetrating the disc, the front plate and the rear plate, the slit cam being formed between the front plate and the rear plate . The slit adjustment mechanism of the forward and reverse seam switching device of claim 8, further comprising a positioning component, the disc is provided with a blind hole, the knob is provided with a plurality of perforations arranged in an annular shape, and the positioning component comprises a a coil spring and a positioning pin, the coil spring is received in the blind hole, the positioning pin passes through the blind hole and is elastically urged by the coil spring, and the end of the positioning pin away from the coil spring corresponds to each The hole is embedded as a fixed position. The slot adjustment mechanism of the forward-backlash switching device according to claim 8, further comprising a limiting component, the limiting component comprising a set of rings and a fixing pin, the collar being sleeved and fixed on the shaft A baffle is extended around the circumference of the collar, and the fixing pin is fixed to the rear plate corresponding to the swivel area of the baffle to limit the rotational orientation of the baffle.