TWM582051U - Thread cutting device of column-tube type sewing machine - Google Patents

Abstract

The present invention discloses a thread cutting device for a column type sewing machine, comprising: a fixed knife, a spring piece, a wire drive mechanism and a movable knife; wherein the fixed knife and the elastic piece are fixedly mounted on a fixed knife seat, and the fixed knife seat is fixedly mounted on a base of the top surface of the rotary cylinder, the front end of the elastic piece extends below the fixed knife and has a gap with the fixed knife; the movable knife comprises a movable knife seat and a movable blade integrally formed, and the movable knife seat is fixed Installed at the end of a movable knife arm, the movable knife arm has a rotating shaft at the head end, and the rotating shaft is provided with a second gear. The movable knife rotating arm drives the movable blade to reciprocate between a preparation position and a line position, in a tangent line. The movable blade of the position is clamped between the fixed knife and the elastic piece. When the movable blade reaches the tangential position, the movable knife can cooperate with the fixed knife to cut the bottom line; the tangential transmission mechanism comprises a shaft tube and a reciprocating drive mechanism, one end of the shaft tube The first gear and the second gear mesh with each other, and the reciprocating drive mechanism can drive the shaft tube to reciprocate to drive the movable knife to perform the tangential action.

Description

Tangential device for column type sewing machine

The invention relates to a thread cutting device for a sewing machine, in particular to a thread cutting device for a column type sewing machine.

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 Taiwanese new patent (certificate number: M531960) that has been authorized to be announced, a "sewing machine automatic thread cutting device" is disclosed, which comprises: all knife mechanisms, having a fixed cutter and a movable cutter, and the above movable cutter is connected to everything a cutter shaft, wherein the cutter shaft is mounted with a gear; a swing mechanism has a rotating shaft forming a swing center, and the rotating shaft is provided with a first swing arm and a second swing arm, and the first swing arm forms a pressure receiving arm and a second arm, the second swing arm is formed with a driving tooth that is engaged with the gear, and can drive the cutter shaft yaw; a cam is assembled on the lower shaft of the sewing machine and rotates synchronously with the lower shaft And the cam is located on the side of the abutting arm and is provided with a deflecting curved surface; a driver has a mandrel that is movable and contracted toward the pressure receiving arm, and the mandrel can push against the pressure receiving arm, thereby driving the swinging mechanism Synchronizing a forward direction yaw so that the abutting arm contacts the cam, and the deflecting curved surface of the cam is pushed against the pushing arm, thereby driving the pendulum Institutions simultaneously swing back a return direction tangent to complete the job.

The tangential mechanism of the cylindrical sewing machine proposed by the Taiwanese new patent (certificate number: M522964), which has been authorized to be announced, includes: a fixed knife and a movable knife, and the difference from the prior art is that the fixed knife of the M522964 patent technology is fixed. Installed on the inside bottom surface of the needle plate.

The technical problem to be solved by the present invention is to provide a tangential device for a column type sewing machine.

Based on solving the above technical problems, the tangential device of the created cylindrical sewing machine is installed in a rotary column cylinder and located below the needle plate, and the rotary hook cylinder is provided with a hook and is used to drive the rotary hook. Rotating a rotary drive shaft; the tangential device of the present invention comprises: a fixed knife, a shrapnel, a wire drive mechanism and a movable knife.

The fixed knife and the elastic piece are fixedly mounted on a fixed knife seat, and the fixed knife seat is fixedly mounted on a base of the top surface of the rotary column cylinder, and the front end of the fixed knife has a fixed blade edge portion.

The front end of the elastic piece extends below the fixed knife and has a gap with the fixed knife, and the side of the elastic piece has a supporting wire piece.

The tangential transmission mechanism comprises: a shaft tube and a reciprocating drive mechanism, the shaft tube is sleeved on the outer side of the rotary drive shaft in a coaxial relationship, the first end of the shaft tube has a first gear, and the reciprocating drive mechanism can drive the shaft tube The reciprocating motion is used to perform a tangential motion.

The movable knife comprises a movable knife seat and a movable blade integrally formed, the movable knife seat is fixedly mounted at an end of a movable knife arm, the head end of the movable knife arm has a rotating shaft, and the rotating shaft is rotatably pivoted on the fixed knife a seat and a base, the rotating shaft is provided with a second gear and the first gear meshes.

The top surface of the movable blade has a wire slot, and the front end of the wire slot has an opening The mouth is used to guide the bottom line to enter the wire slot from the opening, and the joint of the end of the wire groove and the top surface of the movable blade has a movable blade portion, and the movable knife arm drives the movable blade seat and the movable blade on the outer side of the hook a movable blade that is reciprocated between a ready position and a line position around the hook, the movable blade in the tangential position being sandwiched between the fixed blade and the shrapnel, and the movable blade moving from the prepared position toward the tangential position, The opening of the front end of the wire guide can guide the bottom wire to enter the wire groove from the opening, and when the movable blade reaches the tangential position, the movable blade portion can cooperate with the fixed blade portion to cut the bottom line.

A preferred embodiment of the reciprocating drive mechanism includes: a cam fixed to the main shaft of the cylindrical sewing machine, a clutch and a connecting rod, one end of the connecting rod is connected to a rocker arm of the shaft tube, and the other end of the connecting rod is connected to the clutch, The clutch can be selectively moved to an active position and an inactive position. The clutch and the cam in the active position are in contact with each other. The cam can drive the clutch and the connecting rod to reciprocate to drive the rocker arm through the connecting rod, thereby driving the shaft tube to reciprocate.

As a preferred embodiment of the tangential device of the present cylindrical type sewing machine, the actuator may be any one of a push-pull electromagnet and a pneumatic cylinder.

A preferred embodiment of the clutch includes: a driver and a cam rocker arm, the tail end of the cam rocker arm rotatably connecting the body of the cylinder type sewing machine, and the driver connecting the cam rocker arm for selectively connecting one end of the cam rocker arm The end is pushed to the working position and the inactive position, and the head end of the cam rocker arm at the acting position can be in contact with the cam, and the head end of the cam rocker arm in the inactive position does not act with the cam, and the drive is normally driven when the tangential action is not performed. The cam rocker arm stays in the inactive position.

As a preferred embodiment of the tangential device of the created cylindrical sewing machine, the utility model comprises a positioning hook, the positioning hook is fixed on a positioning hook bracket, and the positioning hook bracket is fixed. Mounted in the fixed seat, the positioning hook is located outside the hook.

The utility model has the advantages that the tangential device of the created cylindrical sewing machine has the advantages of easy maintenance and adjustment, on the other hand, the bottom thread can be prevented from sagging and the bottom thread is held and positioned, which is beneficial for the bottom thread to be hooked during the next sewing operation. hook.

The preferred embodiments of the present invention are described below in conjunction with the drawings. The following examples are set forth to illustrate the present invention and are not intended to limit the scope of the present invention. Anyone skilled in the art can make some changes and refinements. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application attached.

10‧‧‧ fixed knife

101‧‧‧Fixed blade

11‧‧‧Fixed holder

20‧‧‧Shrap

21‧‧‧ front end

22‧‧‧托托片

30‧‧‧ activity knife

31‧‧‧ activity knife holder

32‧‧‧Active Blades

321‧‧‧ wire trough

322‧‧‧ openings

33‧‧‧ active knife arm

End of 331‧‧‧

332‧‧‧ shaft

34‧‧‧Active blade

35‧‧‧second gear

40‧‧‧ shaft tube

41‧‧‧First gear

42‧‧‧ rocker arm

51‧‧‧Rotary column

52‧‧ ‧ hook

53‧‧‧Rotary drive shaft

54‧‧‧Base

55‧‧‧ needle board

60‧‧‧ positioning hook

61‧‧‧ positioning hook bracket

70‧‧‧Reciprocating drive mechanism

71‧‧‧ Spindle

72‧‧‧ cam

73‧‧‧ linkage

80‧‧‧Clutch

81‧‧‧ drive

82‧‧‧Cam rocker arm

821‧‧‧End

822‧‧‧ head end

B‧‧‧ body

L‧‧‧ bottom line

Fig. 1 is an exploded perspective view showing an embodiment of a tangential device of the present cylindrical type sewing machine.

Fig. 2 is a partial structural exploded view showing an embodiment of the tangential device of the present cylindrical type sewing machine.

Fig. 3 is a side view showing the structure of Fig. 1.

Fig. 4 is a view showing the operation of the tangential device of the created cylindrical sewing machine.

Fig. 5 is a schematic view showing the operation of the thread cutting device of the created cylindrical sewing machine.

The positional relationship described in the following embodiments includes upper, lower, left and right, and unless otherwise specified, is based on the direction indicated by the components in the drawing.

First, referring to Fig. 1, Fig. 2, and Fig. 3, a structural exploded view, a partial structural exploded view, and a structural side view of an embodiment of the tangential device of the present cylindrical type sewing machine.

The tangential device of the present cylindrical type sewing machine is mounted on a hook column 51 and located below the needle plate 55. The hook column 51 is provided with a hook 52 (shown by a broken line) and is used for driving The hook drive shaft 53 (shown by a broken line) rotated by the hook 52, the hook 52 has a bottom line L for supplying the bottom line L required for the sewing operation (see Figures 4 and 5); the tangent of the creation The device comprises: a fixed knife 10, a spring piece 20, a line drive mechanism and a movable knife 30.

The fixed blade 10 and the elastic piece 20 are fixedly mounted on a fixed blade holder 11. The fixed blade holder 11 is fixedly mounted on a top surface 54 of the top surface of the hook column 51. The front end of the fixed blade 10 has a fixed blade portion 101. The front end 21 of the elastic piece 20 extends below the fixed blade 10 and has a gap with the fixed blade 10.

The tangential transmission mechanism includes: a shaft tube 40 and a reciprocating drive mechanism 70. The shaft tube 40 is sleeved on the outer side of the hook drive shaft 53 in a coaxial relationship. One end of the shaft tube 40 has a first gear 41 and is reciprocally driven. The mechanism 70 can drive the reciprocating motion of the shaft tube 40 for the tangential action.

The movable knife 30 includes a movable knife seat 31 and a movable blade 32 integrally formed. The movable blade holder 31 is fixedly mounted at an end 331 of a movable blade arm 33. The head end of the movable blade arm 33 has a rotating shaft 332 and a rotating shaft. The 332 is rotatably pivoted to the fixed seat 11 and the base 54. The rotating shaft 332 is provided with a second gear 35 and the first gear mesh 41.

The top surface of the movable blade 32 has a wire slot 321 . The front end of the wire slot 321 has an opening 322 for guiding the bottom line L (see FIG. 4 ) to enter the wire slot 321 from the opening 322 . The joint of the top end and the top surface of the movable blade 32 has a movable blade portion 34, and the movable blade arm 33 drives the movable blade holder 31 and the movable blade 32 around the hook 52 on the outer side of the hook 52 in a preparation position (see 4) and the reciprocating motion between all line positions (see Figure 5), live at the tangent position The moving blade 32 is sandwiched between the fixed blade 10 and the elastic piece 20 (see FIG. 5). During the movement of the movable blade 32 from the preparation position toward the tangential position, the opening 322 of the front end of the wire groove 321 can guide the bottom line. L enters the wire groove 321 by the opening 322. When the movable blade 32 reaches the tangential position, the movable blade portion 34 can cooperate with the fixed blade portion 101 to cut the bottom line, wherein the fixed blade portion 101 and the movable blade portion 34 have the cross-sectional shapes. A cutting surface with sharp edges.

The side of the elastic piece 20 has an upwardly extending support piece 22, and when the movable blade 32 of the movable blade 30 is moved to the tangential position, the side of the movable blade 32 passes through the side of the support piece 22 (see Fig. 5). The function of the support piece 22 is to hold the bottom line L together with the elastic piece 20 and the movable blade 32 to prevent the bottom line L from sagging, and is hooked by the hook 52 during the next sewing operation, and has the tension for adjusting the bottom line L. The function.

A preferred embodiment of the reciprocating drive mechanism 70 includes a cam 72 fixed to the main shaft 71 of the cylindrical sewing machine, a clutch 80 and a connecting rod 73. The main shaft 71 is further used to drive the rotary bobbin 53 to rotate. One end of the 73 is connected to a rocker arm 42 of the shaft tube 40 (see Fig. 3), and the other end of the link 73 is connected to the clutch 80. The clutch 80 can be selectively moved to an active position and an inactive position at the active position. The clutch 80 is in contact with the cam 72. The cam 72 can drive the clutch 80 and the link 73 to reciprocate to drive the rocker arm 42 through the connecting rod 73, thereby driving the shaft tube 40 to reciprocate.

The clutch 80 of the reciprocating drive mechanism 70 includes a driver 81 and a cam rocker arm 82. The tail end 821 of the cam rocker arm 82 is rotatably coupled to the body B of the cylindrical sewing machine, and the driver 81 is coupled to the cam rocker arm 82 for selection. The head end 822 of the cam rocker arm 82 is urged to the action position and the inactive position, wherein the driver 81 may be any one of a push-pull electromagnet and a pneumatic cylinder, and the head of the cam rocker arm 82 at the active position End 822 can be in contact with cam 72, in other words The clutch 80 in the active position maintains the head end 822 of the cam rocker arm 82 in contact with the cam 72, and the head end 822 of the cam rocker arm 82 in the inactive position does not act with the cam 72; therefore, during the tangential action The user can control the driver 81 to push the head end 822 of the cam rocker arm 82 to the active position such that the head end 822 and the cam 72 of the cam rocker arm 82 act to drive the cam rocker arm 82 and the link 73 with the cam 72, thereby Driving the shaft tube 40, the movable knife arm 33 and the movable blade 32 to reciprocate between a preparation position (see Fig. 4) and all line positions (see Fig. 5), thereby implementing a tangential action; When in operation, the driver 81 normally drives the cam rocker arm 82 to stay in the inactive position.

As a preferred embodiment of the tangential device of the present cylindrical type sewing machine, a positioning hook 60 is included, and the positioning hook 60 is fixed to a positioning hook bracket 61, and the positioning hook bracket 61 is fixedly mounted on the fixed knife seat 11, positioning The hook 60 is located outside the hook 52, and the positioning hook 60 is used to hold the bobbin case of the hook 52 to fix the exit position of the bottom line L.

Although the present invention has been disclosed above by the above embodiments, it is not intended to limit the present invention, and those skilled in the art 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 definition of the claims of the present application.

Claims (5)

A tangential device for a column type sewing machine, the tangential device is mounted on a hook column and located below the needle plate, the hook column is provided with a hook and a hook drive shaft for driving the hook to rotate The tangential device comprises: a fixed knife, a spring piece, a wire drive mechanism and a movable knife; the fixed knife and the elastic piece are fixedly mounted on a fixed knife seat, and the fixed knife seat is fixedly mounted on the rotation a base of the top surface of the bobbin case, the front end of the fixed blade having a fixed blade portion; a front end of the elastic piece extending below the fixed blade and having a gap with the fixed blade, the side of the elastic piece having a tangential transmission mechanism; the tangential transmission mechanism includes: a shaft tube and a reciprocating driving mechanism, the shaft tube is sleeved on the outer side of the slewing drive shaft in a coaxial relationship, and one end of the shaft tube has a first gear, the reciprocating The driving mechanism can drive the reciprocating rotation movement of the shaft tube for performing a tangential action; the movable knife comprises an integrally formed movable knife seat and a movable blade fixedly mounted on a movable knife arm The end of the movable cutter arm has a rotating shaft, and the rotating shaft is rotatably pivoted on the fixed seat and the base, and the rotating shaft is provided with a second gear and the first gear; the top of the movable blade The front surface of the wire slot has an opening for guiding the bottom wire to enter the wire slot from the opening, and the connecting end of the wire slot and the top surface of the movable blade has a movable blade portion, the movable knife The spiral arm drives the movable knife seat and the movable blade to reciprocate around the hook at a preparation position and a line position on the outer side of the hook, and the movable blade in the tangential position is clamped to the fixed blade And the gap between the elastic piece and the movement of the movable blade from the preparation position toward the tangential position, the opening of the front end of the wire guide may guide the bottom line to enter the wire slot from the opening, where When the movable blade reaches the tangential position, the movable blade portion can cooperate with the fixed blade portion to cut the bottom line. The tangential device of the cylindrical sewing machine according to claim 1, wherein the reciprocating driving mechanism comprises: a cam fixed to a main shaft of the cylindrical sewing machine, a clutch, and a connecting rod, one end of the connecting rod is connected to the shaft tube a rocker arm, the other end of the link is connected to the clutch, the clutch is selectively movable to an active position and an inactive position, the clutch in the active position is in contact with the cam, the cam can drive the clutch And the connecting rod generates a reciprocating motion to drive the rocker arm through the connecting rod, thereby driving the shaft tube to reciprocately rotate. A thread cutting device for a column type sewing machine according to claim 2, wherein the clutch comprises: a driver and a cam rocker arm, the tail end of the cam rocker arm rotatably connecting the body of the column type sewing machine, the driver connecting the a cam rocker arm for selectively pushing a head end of the cam rocker arm to the active position and the inactive position, wherein the head end of the cam rocker arm in the active position is in contact with the cam, and the inactive The head end of the cam rocker arm does not act on the cam. When the tangential action is not performed, the driver normally drives the cam rocker arm to stay in the inactive position. A thread cutting device for a column type sewing machine according to claim 3, wherein the driver is any one of a push-pull electromagnet and a pneumatic cylinder. The tangential device of the column type sewing machine according to claim 1, which comprises a positioning hook fixed to a positioning hook bracket, the positioning hook bracket is fixedly mounted on the fixed knife seat, and the positioning hook is located at the hook The outside.