TWM522964U - Post cylinder-shaped sewing machine thread cutting mechanism - Google Patents

Description

Tangential mechanism of cylindrical sewing machine

The invention relates to a tangential mechanism of a column type sewing machine, in particular to a tangential mechanism having a short wire end and a fine adjustment after cutting the suture, which has the advantages of simple structure, easy manufacture and long service life.

There are a wide variety of known sewing machines, which can be applied to the sewing work of different sewing materials, and one of them is a special sewing machine suitable for sewing shoes, bags or cylinders, which is a so-called cylindrical sewing machine.

In the Chinese utility model patent (application number: 200420007103.2) which has been authorized to be announced, a lower wire holding device for a cylindrical sewing machine is proposed, which comprises: a movable knife which is fixed on a mounting block mounted on the base by screws and The shaft is free to rotate at the center, and a blade having a curved surface is formed at the end portion thereof; a fixed knife is mounted on the vertical surface of the soil table below the rotary hook, and is fixed by screws to move in the horizontal direction, and the end portion thereof The pressing rod is in contact with the outer peripheral surface of the movable knife; the pressing rod is installed between the fixed knife and the outer peripheral surface of the movable knife, and the front end portion thereof is in contact with the groove on the curved surface of the movable knife, and the shaft is freely rotatable by the shaft Inserted on a socket fixed to the outer periphery of the hook; the stopper is screwed to the lower side of the shaft of the pressing rod, and is in contact with the notch of the socket mounted on the upper and lower moving spaces below the hook, The upper and lower positions of the pressing rod can be set, a spring is sandwiched between the stopper and the soil table; and the pressing rod of the spring is urged to rotate, and the front end portion is pushed into the bottom surface of the groove of the movable knife.

In the Chinese utility model patent (application number: 200920069351.2) which has been authorized to be announced, an automatic thread cutting device for a sewing machine is proposed, which comprises a rotary bobbin, a transmission shaft, a movable knife, a cam set and a driver; and the utility model is characterized in that: Fixing a fixed knife; the drive shaft is mounted in the hook support; a cam assembly is arranged on the drive shaft and rotates synchronously with the drive shaft, the cam set includes an axial cam, a limit cam and a reset a cam, the surface of the axial cam adjacent to the limiting cam respectively forms a deflecting curved surface, and a guiding groove is formed between the two deflecting curved surfaces, and the axial cam has a rotating curved surface adjacent to the deflecting curved surface, the resetting The cam forms a resetting surface in a radial direction; a movable knife is pivotally mounted on the hook base via a pivot shaft, and a pivot arm is disposed below the pivot shaft, and a driver is mounted on the swing arm, the driver has a directional direction a camshaft radially movable telescopic mandrel; when the movable knife is rotated to a hook line position by an initial position in contact with the fixed knife, the driver projects the core axially in the direction of the cam group, the mandrel Entering the guiding groove, the guiding groove pushes the mandrel to move along the axial direction of the transmission shaft, and rotates the swing arm and the pivot shaft, and drives the movable knife to rotate from the initial position to the hook line position; The revolving surface pushes the front end of the mandrel back to the initial position, causing the swing arm and the pivot to rotate in the opposite direction, driving the movable knife to reversely rotate and return to the position, and connecting the fixed knife to complete the tangential action; the mandrel is subjected to the reset cam The reset surface pushes the retraction bit.

The movable knife and the fixed knife of the thread cutting mechanism of the conventional sewing machine are all mounted on the hook base, or the movable knife is fixed on the mounting block mounted on the base, wherein the rotating shaft center of the movable knife is located at the rotation axis of the hook The side makes the size of the cylinder in the radial direction of the hook larger, wherein the structure of the pressing rod for clamping the suture is complicated, and the manufacturing and assembling thereof are relatively difficult; in addition, the relative positions of the movable knife and the hook are fixed, The error caused by the friction of the hook after a period of use, and thus the relative position between the suture and the movable knife, easily causes the movable knife to capture the suture The mistake of time leads to the failure of the tangent, although the replacement of the hook can solve the above problems, but it will affect the service life and increase the cost of maintenance.

One of the objects of the present invention is to solve the above-mentioned problems of the conventional column type sewing machine, and to provide a tangential mechanism which is simple in construction, easy to manufacture and assemble, and which has a short thread end remaining on the surface of the sewn body after the suture is cut, and can be eliminated. Subsequent trimming of the secondary processing of the long thread.

Another object of the present invention is to provide a position that can fine-tune the movable knife to compensate for the error caused by the friction of the hook after being used for a period of time, and to avoid the failure of the movable knife when capturing the stitching, thereby causing the failure of the tangent. The effect of extending the service life.

An embodiment of the tangential mechanism of the novel cylindrical sewing machine comprises: a needle plate, a hook, a fixed knife, a crimping plate and a movable knife; wherein the rotary hook is located at the needle plate Below, the hook is rotatably mounted on the column; the fixed knife is fixedly mounted on the inner bottom surface of the needle plate, and one side edge of the fixed knife has a first blade portion; the crimping plate is fixedly mounted under the fixed knife, and the crimping plate is fixed The utility model has a tongue; the movable knife is located below the pressure plate, the movable knife has a first surface facing the crimping plate, the first surface has a wire groove, and the front end of the wire groove has an opening for guiding the opening of the thread by the opening Entering the wire groove, the end of the wire groove and the first surface of the wire groove have a second blade portion, and the second blade portion rotates around the circumference of the rotary hook with the axis of the rotary spindle as a center of rotation, wherein the pressure is reversed. The tongue of the wire plate can extend into the wire groove and press the seam in the wire groove, and the second blade portion can be moved toward the first blade portion when rotated to cooperatively cut the suture.

In an embodiment of the tangential mechanism of the novel cylindrical sewing machine, wherein the rotary spindle has a rotary drive shaft, the movable cutter is mounted on a movable cutter seat, and the movable cutter seat is mounted on one end of a movable cutter drive shaft. The movable cutter drive shaft is a hollow shaft, and the rotary drive shaft is rotatable The dynamic relationship is coaxially threaded into the axis of the movable cutter drive shaft.

In an embodiment of the tangential mechanism of the novel cylindrical sewing machine, wherein the movable knife is movably mounted to the movable seat by means of a bolt, the second blade of the movable knife and the rotation can be adjusted in the radial direction of the hook. The relative position of the shuttle is used to compensate for the error caused by the wear of the hook after a period of use, and to avoid the failure of the movable knife when capturing the stitch, which leads to the failure of the tangent.

In an embodiment of the tangential mechanism of the novel cylindrical sewing machine, wherein the movable knife seat of the movable knife has a first clamping sleeve which is adjustable in tension, and the movable knife seat is mounted on the movable knife transmission shaft by the first clamping sleeve. At one end, the position of the reciprocating rotational movement of the second blade of the movable knife about the outer circumference of the hook can be adjusted by the first set of clips.

In an embodiment of the tangential mechanism of the novel cylindrical sewing machine, wherein the movable cutter drive shaft is mounted with a second clamping sleeve that is adjustable in tension, and the movable cutter drive shaft is coupled to the movable knife driving mechanism by the second clamping sleeve. The second set of clips can adjust the starting point and the end point of the reciprocating rotation of the movable cutter drive shaft, and then adjust the position of the reciprocating rotational movement of the second blade portion of the movable knife about the outer circumference of the rotary hook.

The specific embodiments and other advantages and effects of the present invention will be described below in conjunction with the drawings.

A1‧‧‧ arrow

A2‧‧‧ arrow

L1‧‧‧ Axis

S‧‧‧ rotating plane

T‧‧‧ stitching

10‧‧‧column

11‧‧‧ Spindle

12‧‧‧First gear

20‧‧‧ needle board

21‧‧‧Perforation

30‧‧ ‧ hook

31‧‧‧Rotary drive shaft

32‧‧‧second gear

40‧‧‧ fixed knife

41‧‧‧ first blade

42‧‧‧First bolt

43‧‧‧ sloping plate

50‧‧‧Crimping board

51‧‧‧ tongue

60‧‧‧ activity knife

61‧‧‧ first surface

62‧‧‧ lead groove

621‧‧‧ openings

63‧‧‧second blade

64‧‧‧ activity knife holder

641‧‧ ‧ chute

65‧‧‧ movable knife drive shaft

66‧‧‧Bolts

67‧‧‧ Slider

671‧‧‧Assembled holes

68‧‧‧First jacket

681‧‧‧First adjustment bolt

69‧‧‧Second jacket

691‧‧‧Second adjustment bolt

70‧‧‧Feeding agency

71‧‧‧feeding wheel

80‧‧‧Active Knife Drive Mechanism

81‧‧‧Axial cam

811‧‧‧ guiding slot

82‧‧‧ drive

83‧‧‧Clutch

831‧‧‧ toggle lever

84‧‧‧ linkage

Fig. 1 is a structural view showing an embodiment of a column type sewing machine of the present invention, showing a structural exploded view of a thread cutting mechanism and other related mechanisms of the novel column type sewing machine.

Fig. 2 is a structural view showing an embodiment of a column type sewing machine of the present invention, showing a structural combination diagram of a thread cutting mechanism and other related mechanisms of the novel column type sewing machine.

Fig. 3 is an enlarged view showing a partial structure of a position A shown in Fig. 2 in the figure.

Fig. 4 is an enlarged view showing a partial structure of a position B shown in Fig. 1 in the figure.

Fig. 5 is a partial structural view showing an embodiment of a thread cutting mechanism of the column type sewing machine of the present invention.

Fig. 6 is a partial structural view showing an embodiment of a tangential mechanism of the column type sewing machine of the present invention, showing the structure of the embodiment of Fig. 5 and the structure after the combination of the needle plates.

Fig. 7A is a schematic view showing the operation of an embodiment of the tangential mechanism of the column type sewing machine of the present invention, showing the normal position of the movable knife.

Fig. 7B is a schematic view showing the operation of an embodiment of the thread cutting mechanism of the column type sewing machine of the present invention, showing the preparation position where the movable knife reaches the catching stitch.

Fig. 8 is an enlarged view showing a partial structure of a position C shown in Fig. 1 in the figure.

First, please refer to FIG. 1 and FIG. 2 , which are structural diagrams of an embodiment of a tangential mechanism of the column-type sewing machine, respectively, and an exploded view and a combination view of the tangential mechanism and other related mechanisms.

An embodiment of the tangential mechanism of the novel cylindrical sewing machine comprises a needle plate 20, a hook 30, a fixed knife 40, a crimping plate 50 and a movable knife 60 mounted to the cylinder 10. The column 10 is mounted on the base of the column type sewing machine. Since the design of the conventional column type sewing machine is the same, the appearance of the complete sewing machine and the base thereof are not shown, and the needle plate 20 is attached to the top end of one side of the column 10, The sewing needle (not shown) installed in the front end of the cylindrical sewing machine is reciprocated by the perforation 21 on the needle plate 20 (see Fig. 6), the upper thread drawn by the sewing needle, and the hook 30 The lower line interacts to realize the sewing operation of the sewn object. In general, the cylinder 10 of the cylindrical sewing machine includes a feeding mechanism 70, and the feeding wheel 71 of the feeding mechanism 70 is mounted on one of the hooks 30. On the side, the top end of the feed wheel 71 is exposed outside the top surface of the cylinder 10 for moving the slats during the sewing operation.

Please refer to FIG. 5 and FIG. 6 , which are partial structural views of an embodiment of a thread cutting mechanism of the column type sewing machine, in order to clearly show the relationship between the fixed knife 40 , the crimping plate 50 and the movable knife 60 and The structure of the hook 30 is omitted. The fixed blade 40 is fixedly mounted on the inner bottom surface of the needle plate 20 by a first bolt 42. One side edge of the fixed blade 40 has a first blade portion 41; The plate 50 is fixedly mounted below the fixed blade 40 by the same first bolt 42, and the crimping plate 50 has a tongue 51. Preferably, the fixed blade 40 and the crimping plate 50 are both fabricated using a metal plate.

The movable blade 60 is located below the crimping plate 50. The movable blade 60 has a first surface 61 facing the crimping plate 50. The first surface 61 has a wire groove 62. The front end of the wire groove 62 has an opening 621 for guiding. The suture T enters the wire groove 62 from the opening 621. The end of the wire groove 62 and the first surface 61 are joined to each other with a second blade portion 63. The second blade portion 63 is at the axis L1 of the hook 30 (see Fig. 2). a reciprocating rotational motion about the outer circumference of the rotary hook 30 for the center of rotation, as shown in Fig. 3, wherein the plane of rotation S of the second blade portion 63 and the first blade portion 41 are closely adjacent; For example, the fixed blade 40 has a swash plate 43 extending obliquely toward the first surface 61 of the movable blade 60. The first blade portion 41 is located at the end of the swash plate 43 in the obliquely extending direction, and the swash plate 43 can be deformed due to the deformation. The elastic force is generated to ensure that the first blade portion 41 of the fixed blade 40 can reliably shear the second blade portion 63 of the movable blade 60 when the thread cutting operation is performed.

The tongue piece 51 of the crimping plate 50 can extend into the wire groove 62 and press the stitching T in the wire groove 62, and the second blade portion 63 can be moved toward the first blade portion 41 during rotation to be cooperatively cut off. Suture T. Preferably, the tongue 51 extends obliquely toward the direction of the wire groove 62 of the movable blade 60, The tongue piece 51 can be pressed against the suture T in the wire groove 62 to clamp the suture T before the suture T is cut.

Referring to FIG. 1 , FIG. 2 and FIG. 4 , an embodiment of the tangential mechanism of the present type of column type sewing machine is constructed in which the axis of the hook 30 has a hook drive shaft 31 and a hook drive shaft 31 . A second gear 32 is mounted on the bottom end, and the second gear 32 is engageable with a first gear mounted on a spindle 11 which is powered by a cylinder type sewing machine (generally an electric motor, not shown) The drive rotates, and the main shaft 11 drives the rotary hook 30 to rotate through the first gear 12 and the second gear 32. The movable knife 60 is mounted on a movable knife seat 64. The movable knife seat 64 is mounted on one end of a movable knife drive shaft 65. The movable knife drive shaft 65 is a hollow shaft, and the rotary shuttle drive shaft 31 is coaxially penetrated in a rotatable relationship. The center of the movable blade drive shaft 65 is so that the second blade portion 63 of the movable blade 60 can reciprocate about the outer circumference of the rotary hook 30 with the axis L of the rotary hook 30 as a center of rotation, wherein the crimping plate 50 The tongue 51 can extend into the wire groove 62 and press against the stitch T in the wire groove 62, and the second blade portion 63 can be moved toward the first blade portion 41 when rotated to cooperatively cut the stitch T. The movable knife 60 of the present invention reciprocates about the outer circumference of the hook 30 with the axis L of the hook 30 as a center of rotation. Therefore, the size of the cylinder 10 in the radial direction of the hook 30 is relatively smaller than that described above. The conventional technique and the structure of the fixed blade 40, the crimping plate 50, and the movable blade 60 of the present tangential mechanism are simplified and easy to manufacture and assemble.

The bottom end of the movable blade drive shaft 65 and the connecting rod 84 of the movable blade drive mechanism 80 are connected to each other, wherein the movable blade drive mechanism 80 is used to drive the movable blade drive shaft 65 to reciprocate, and the movable blade drive mechanism 80 An example configuration includes an axial cam 81, a driver 82, a clutch 83 and a connecting rod 84, wherein the axial cam 81 is fixedly mounted to the main shaft 11, and the axial cam 81 has a guiding slot 811, and the driver 82 is a kind The electromagnet, when the driver 82 acts, can pull a toggle lever 831 of the clutch 83 and the guiding slot 811 (the toggle lever 831 normally does not cooperate with the guiding slot 811). Coupling), one end of the toggle lever 811 is connected to the connecting rod 84, and when the toggle lever 831 is coupled with the guiding slot 811, the toggle lever 831 can drive the connecting rod 84 to reciprocate under the linkage of the guiding slot 811, and then reuse The connecting rod 84 drives the movable cutter drive shaft 65 to perform a reciprocating rotational movement, and the movable cutter drive shaft 65 drives the movable cutter 60 to perform the tangential operation.

Please refer to FIG. 7A and FIG. 7B. When the sewing operation is performed, the movable knife 60 is stopped at a normal position. The movable knife 60 in the normal position as shown in FIG. 7A is located below the crimping plate 50 and avoids. The sewing position of the driving needle. When the sewn end needs to cut the suture T, the movable knife 60 is first moved from the normal position in the direction indicated by the arrow A1 in Fig. 7A to the preparation position capable of capturing the suture T, waiting for the hook 30 to hook the suture T The movable knife 60 moves to a catching position in the direction indicated by the arrow A2 in FIG. 7B toward the fixed blade 40, since the movable blade 60 reciprocates with the axis of the movable blade drive shaft 65 (and the concentricity of the hook 30). The rotational movement, therefore, the moving direction of the movable knife 60 from the normal position to the preparatory position (the direction indicated by the arrow A1) is opposite to the direction in which the movable knife 60 moves toward the fixed blade 40 (the direction indicated by the arrow A2), to the 逹 capturing position The movable knife 60 captures the suture T by the opening 621 of the wire groove 62, and the movable blade 60 continues to move in the direction of the fixed blade 40 and brings the suture T into the wire groove 62, and the seam is made by the tongue 51 of the crimping plate 50. The wire T is pressed into the wire groove 62 for gripping the stitching T (see FIG. 7B), and the second blade portion 63 of the movable blade 60 can cooperate with the stitching when passing through the first blade portion 41 of the fixed blade 40. When T is cut, the movable knife 60 will return to the normal position again after completing the tangential action. Wait for the next tangent job.

Referring to Fig. 4, in an embodiment of the tangential mechanism of the novel cylindrical sewing machine, the movable knife 60 is movably mounted to the movable blade holder 64 by a bolt 66 having a sliding end at the bottom end of the movable blade 60. Block 67, the movable blade holder 64 has a sliding groove 641, the sliding groove 641 extends in the radial direction of the rotary hook 30, and the slider 67 has an elongated assembly hole 671, and the longitudinal direction of the assembly hole 671 Extending in the radial direction of the hook 30, the bolt 66 can pass through the assembly hole 671 and screwed into the screw hole of the bottom surface of the sliding groove 641. Therefore, the movable knife can be adjusted in the radial direction of the hook 30 through the bolt 66. The relative position of the second blade portion 63 of the 60 and the hook 30 is used to compensate for the error caused by the rotation of the hook 30 after the hook 30 is used for a period of time (because the tip of the hook 30 and the bur are often rubbed, Wear is generated) to avoid the failure of the movable knife 60 when capturing the suture T, resulting in failure of the tangent.

Referring to FIG. 4, an embodiment of the tangential mechanism of the present type of column type sewing machine is constructed, wherein the movable blade holder 64 of the movable blade 60 has a first jacket 68 through which one of the first jackets 68 is screwed. The first adjusting bolt 681 can clamp the first clamping sleeve 68 to the movable cutter transmission shaft 65. The movable cutter base 64 is mounted on one end of the movable cutter transmission shaft 65 by the first clamping sleeve 68, and the first clamping sleeve 68 can be The second blade portion 63 of the movable blade 60 is adjusted to a position of a reciprocating rotational motion about the outer circumference of the hook 30.

Referring to FIG. 8, in an embodiment of the tangential mechanism of the novel cylindrical sewing machine, the movable cutter drive shaft 65 is mounted with a second jacket 69 through a second adjustment screwed to the second jacket 69. The bolt 691 can clamp the second jacket 69 to the bottom end of the movable knife drive shaft 65. The movable cutter drive shaft 65 is coupled to the link 84 of the movable blade drive mechanism 80 by the second jacket 69, with the second clamp. 69. The starting point and the end point of the reciprocating rotation of the movable blade drive shaft 65 can be adjusted, and the position of the reciprocating rotational movement of the second blade portion 63 of the movable blade 60 about the outer circumference of the hook 30 can be adjusted.

Although the present invention has been disclosed above in the above embodiments, it is not intended to limit the present invention, and the skilled person can make some modifications and retouchings without departing from the spirit and scope of the present invention. The scope of patent protection is subject to the terms of the claims attached to this specification.

11‧‧‧ Spindle

12‧‧‧First gear

31‧‧‧Rotary drive shaft

32‧‧‧second gear

40‧‧‧ fixed knife

41‧‧‧ first blade

43‧‧‧ sloping plate

50‧‧‧Crimping board

51‧‧‧ tongue

60‧‧‧ activity knife

61‧‧‧ first surface

62‧‧‧ lead groove

621‧‧‧ openings

63‧‧‧second blade

64‧‧‧ activity knife holder

65‧‧‧ movable knife drive shaft

66‧‧‧Bolts

68‧‧‧First jacket

681‧‧‧First adjustment bolt

69‧‧‧Second jacket

691‧‧‧Second adjustment bolt

70‧‧‧Feeding agency

71‧‧‧feeding wheel

80‧‧‧Active Knife Drive Mechanism

81‧‧‧Axial cam

811‧‧‧ guiding slot

82‧‧‧ drive

83‧‧‧Clutch

831‧‧‧ toggle lever

84‧‧‧ linkage

Claims (7)

a tangential mechanism of a cylindrical sewing machine, which is mounted on a cylinder, the cylinder includes a needle plate and a rotary hook, wherein the rotary hook is located below the needle plate, and the rotary hook is rotatably mounted on the cylindrical cylinder; The tangential mechanism includes: a fixed knife, a crimping plate and a movable knife; the fixed knife is fixedly mounted on an inner bottom surface of the needle plate, and a side edge of the fixed knife has a first blade portion; the crimping plate is fixed Mounted under the fixed knife, the crimping plate has a tongue; the movable knife is located below the crimping plate, the movable knife has a first surface facing the crimping plate, the first surface has a wire a groove, the front end of the wire groove has an opening, and the end of the wire groove and the first surface have a second edge portion, and the second blade portion rotates around the axis of the rotary hook a reciprocating rotational movement of the outer circumference of the shuttle, wherein the tongue of the crimping plate can extend into the wire groove and press the stitch in the wire groove, the second blade portion facing the first blade when rotating The direction of movement of the portion is used to cooperatively cut the suture. The tangential mechanism of the cylindrical sewing machine according to claim 1, wherein the fixed cutter has a slanting plate extending obliquely toward the first surface, the first blade being located at an end of the swash plate in an obliquely extending direction. The thread cutting mechanism of the column type sewing machine according to claim 1, wherein the tongue piece extends obliquely toward the direction of the wire groove of the movable blade, and the tongue piece can be pressed into the wire groove before cutting the thread. The stitching. The thread cutting mechanism of the column type sewing machine according to claim 1, wherein the rotary shaft has a rotary shaft, and the movable cutter is mounted on a movable cutter seat, and the movable cutter is mounted on a movable cutter drive shaft. At one end, the movable cutter drive shaft is a hollow shaft, and the rotary drive shaft is rotatable The dynamic relationship is coaxially threaded into the axis of the movable cutter drive shaft. The thread cutting mechanism of the column type sewing machine according to claim 4, wherein the movable knife is movably mounted to the movable knife holder by a bolt, and the movable knife can be moved in a radial direction of the hook to adjust the movable knife The second blade portion and the relative position of the hook. The tangential mechanism of the column type sewing machine according to claim 5, wherein the movable blade has a slider at a bottom end thereof, the movable blade holder having a sliding groove extending in a radial direction of the rotary hook, the sliding The block has an elongated assembly hole, and the long axis direction of the assembly hole extends in a radial direction of the hook, and the bolt can pass through the assembly hole and be screwed to a screw hole of the bottom surface of the sliding slot. The thread cutting mechanism of the column type sewing machine according to claim 4, wherein the movable knife seat of the movable knife has a first jacket, and the first jacket is screwed with a first adjusting bolt for the first jacket Clamped to the movable knife drive shaft.