TWM477469U - Differential feeding device of sewing machine - Google Patents

Description

Sewing machine differential feeding device

The present invention relates to a sewing machine for changing the relative feeding amount between the upper feeding wheel and the lower feeding wheel, in particular to a design in which a coaxial clutch assembly and a differential adjusting mechanism cooperate to make a relative speed change between the two feeding wheels. Differential feeding device.

Generally, the feeding stroke of the sewing machine mainly includes two parts: a needle feeding stroke when the needle passes through the cloth and a needle feeding stroke when the needle is separated from the cloth. Wherein, during the needle feeding stroke, the needle and the cloth advance at the same time, at this time, the upper and lower feeding wheels need to rotate synchronously, so that the upper and lower layers of fabric do not have a pulling hole or the needle is deflected; During the upper feeding stroke, the needle is returned, and the upper and lower feeding wheels can be adjusted to be out of synchronization to control the feeding amount of the upper fabric relative to the lower fabric.

Usually, the sewing machine needs to change the rotation speed of the upper and lower feed rollers to produce a differential effect. Most of the sewing machine adjusts the length of the swing arm on the upper feeding mechanism of the sewing machine, and changes the rotational speed of the lower feed wheel as a reference to change the upper feed wheel. The rotation speed is called the synchronous rotation speed when the rotation speed of the upper feed wheel and the lower feed wheel are the same. When the rotation speed of the upper feed wheel is faster than the synchronous rotation speed, it is called positive differential feed, and when the rotation speed of the upper feed wheel is slower than the synchronous rotation speed. It is called inverse differential feed.

However, the feeding device of the conventional roller feeding sewing machine adopts the principle of a one-way bearing. Although the differential feeding device can perform positive and negative differential feeding, it must be adjusted through the tool, so that the sewing machine cannot change the differential amount during the traveling. And sometimes the adjustment requires multiple tests. In addition, the position of the differential adjustment is usually far from the operating position on the sewing machine to adjust the stitch length. It is not easy and convenient for users to use.

In view of the above-mentioned shortcomings of the conventional sewing machine differential feeding device adjustment, it is necessary to improve the design of a built-in differential feeding adjustment device for the sewing machine to improve the current lack.

The main purpose of the present invention is to provide a differential feeding sewing machine, which has two sets of two-way clutches coaxially mounted on the lower feeding shaft and cooperates with an adjusting mechanism to form a differential effect, so that the overall structure of the sewing machine simplifies the number of components and can effectively reduce the sewing machine. The center of gravity.

The secondary purpose of this creation is that during the sewing operation of the sewing machine, the operator can directly change the differential feeding amount between the upper and lower feeding wheels without interrupting the sewing operation, and the immediate differential feeding sewing effect is generated.

In order to achieve the above purpose, the present invention mainly comprises a feeding mechanism, a linkage mechanism, a differential adjustment mechanism and an upper feeding mechanism to construct a sewing machine differential feeding device.

The lower feeding mechanism is formed by a first feeding shaft and a coaxial second feeding shaft, wherein the first feeding shaft is provided with a first clutch assembly, and the second feeding shaft is provided with a first feeding shaft. a second clutch assembly; the linkage mechanism has a linkage shaft parallel to the lower feed shaft, and the linkage shaft is coupled to the first clutch assembly and the second clutch assembly; the differential adjustment mechanism is assembled to the linkage shaft and the The upper feeding mechanism has an upper feeding shaft, and the upper feeding shaft is connected to the first feeding shaft by a transmission assembly, so that the upper feeding mechanism and the lower feeding mechanism can synchronously move.

The creation differential adjustment mechanism can selectively directly increase or decrease the rotation angle of the first clutch assembly acting on the first feed shaft, thereby generating a positive differential feed or a counter differential feed corresponding to the second feed shaft.

The creation differential adjustment mechanism has a differential swing arm, and the above differential One end of the swing arm is pivotally disposed on the linking shaft, and has a guiding slot extending toward the other end. The guiding slot has a slider inside, and the slider respectively connects the first clutch assembly and an adjusting device with a connecting rod.

The adjusting device comprises a sliding link, an output swing arm, and a An adjustment handle, a positioning plate and a fixing member, one end of the sliding link is connected to the slider, and the other end is assembled to the output swing arm; the output swing arm is pivotally connected to the transmission rod; the transmission rod and the adjustment The handles are pivotally connected to each other; the positioning plate is located on one side of the adjusting handle and has at least one sliding rail; and the fixing member and the adjusting handle are respectively located on opposite sides of the positioning plate, and pass through the sliding rail and adjust The handles are screwed together. Wherein, the adjustment handle, the positioning plate and the fixing member are all exposed outside the sewing machine.

In a preferred embodiment, the creative adjustment handle is exposed. It is located in the pillar portion of the sewing machine and is adjacent to the adjustment stitching operating position of the sewing machine. The above transmission assembly can be set as a belt set, a chain set or a gear set to achieve synchronous movement.

The feature of this creation is that the two two-way clutch assemblies are separately installed. The first feeding shaft and the second feeding shaft are arranged coaxially, and the differential swing arm is driven by the adjusting device to change the rotation angle of the first clutch assembly when the feeding stroke of the needle is applied, so that the sewing person does not need to stop the sewing operation. The speed of the upper feed wheel relative to the lower feed wheel can still be directly changed to form a differential effect.

In addition, since both clutch components are located at the base of the sewing machine The overall structure of the sewing machine simplifies the number of components and reduces the center of gravity of the sewing machine. Furthermore, the adjustment handle, the positioning plate and the fixing member are all exposed outside the sewing machine, and are adjacent to the operating position for adjusting the stitch length, thereby greatly improving the convenience in use.

(this creation)

10‧‧‧Sewing machine

11‧‧‧ head

12‧‧‧Base

13‧‧‧ pillar

20‧‧‧Uploading agency

21‧‧‧Uploading wheel

22‧‧‧Upfeed shaft

23‧‧‧Upper transmission components

30‧‧‧Feed feeding mechanism

31‧‧‧下feeding wheel

32‧‧‧First feed shaft

33‧‧‧Second feed shaft

34‧‧‧Drawing shaft

35‧‧‧First clutch assembly

351‧‧‧Swing device

352‧‧‧Clutch Group

353‧‧‧ Connecting rod

36‧‧‧Second clutch assembly

361‧‧‧Swing device

361a‧‧‧ cam

361b‧‧‧ swing arm

361c‧‧‧ push ring

361d‧‧‧Roller

361e‧‧‧ activity support shaft

362‧‧‧Clutch Group

362a‧‧‧Outer retaining ring

362b‧‧‧Rotor

362c‧‧‧Roller

362d‧‧‧ positioning claw

362e‧‧‧ cover

362f‧‧‧link pin

362g‧‧‧ dent

362h‧‧‧Opening

363‧‧‧ Connecting rod

37‧‧‧Lower transmission components

38‧‧‧lower shaft

40‧‧‧ linkage agency

41‧‧‧ linkage axis

42‧‧‧First swing arm

43‧‧‧Second swing arm

50‧‧‧ Transmission components

51‧‧‧ Pulley

52‧‧‧First belt

53‧‧‧Relay wheel set

54‧‧‧Second belt

55‧‧‧ Pulley

60‧‧‧Differential adjustment mechanism

61‧‧‧Differential swing arm

611‧‧ ‧ guide slot

62‧‧‧ Slider

63‧‧‧ adjustment device

64‧‧‧Sliding link

65‧‧‧ Output swing arm

66‧‧‧Drive rod

67‧‧‧Adjustment handle

68‧‧‧ Positioning plate

681‧‧‧Slide rails

69‧‧‧Fixed parts

Fig. 1 is a schematic view showing the inside of the sewing machine installed in the sewing machine; Fig. 2 is a perspective view showing the differential feeding device of the sewing machine of the present invention; Figure 3 is an exploded view of most of the creations of the lower feeding mechanism, linkage mechanism, differential adjustment mechanism, transmission assembly and upper feeding mechanism; Fig. 4 is an exploded view of the feeding mechanism of Fig. 3; Fig. 3 is an exploded view of the linkage mechanism; Fig. 6 is an exploded view of the differential adjustment mechanism of Fig. 3; Fig. 7 is a side view of the differential adjustment mechanism mounted to the lower feeding mechanism and the linkage mechanism; Fig. 8 is an adjustment The differential handle allows the feeding amount of the upper feeding wheel to be larger than that of the lower feeding wheel; the figure 9 is a schematic diagram of adjusting the differential handle so that the feeding amount of the upper feeding wheel is smaller than that of the lower feeding wheel.

In order to further understand and understand the structure, use and characteristics of this creation, a better and more detailed understanding and understanding are given. The preferred embodiment is described below with reference to the drawings: Please refer to Figure 1 and Figure 2 The sewing machine 10 of the present invention mainly comprises a front portion 11 , a base 12 portion and a pillar 13 portion.

The upper head 11 is internally provided with an upper feeding mechanism 20 for driving an upper feeding wheel 21 for rotation; the base 12 is internally provided with a lower feeding mechanism 30 and a linkage mechanism 40; the lower feeding mechanism 30 drives the feeding wheel 31 for rotation and connection. The linkage mechanism 40 is cooperatively operated; and the support post 13 is partially provided with a transmission assembly 50 and a differential adjustment mechanism 60, wherein the transmission assembly 50 has one end connected to the upper feeding mechanism 20 and the other end connected to the lower feeding mechanism 30. The upper feeding mechanism 20 and the lower feeding mechanism 30 can be operated in synchronization, and the differential adjusting mechanism 60 is installed between the linking mechanism 40 and the lower feeding mechanism 30 to allow the upper feeding wheel 21 and the lower feeding wheel 31 to A relative speed change occurs to form a differential effect.

Please refer to Figure 2 and Figure 3 for the feeding mechanism of this creation. 20 has an upper feed shaft 22, one end of the upper feed shaft 22 is coupled to control an upper feed wheel 21 through a set of upper transmission elements 23, and the other end is assembled with the transmission assembly 50. In the preferred embodiment, the transmission The assembly 50 includes a pulley 51 assembled with the upper feed shaft 22, the pulley 51 is provided with a first belt 52, and a second belt 54 is synchronously driven by a relay wheel set 53 assembled to the first belt 52. Finally, the second belt 54 is coupled to the lower feeding mechanism 30 by a pulley 55.

However, the above-described transmission assembly 50 is composed of a belt set only for the square. For example, the structure of the transmission assembly 50 is not limited, that is, the transmission assembly 50 can also be set to other effects such as a gear set or a chain set to achieve synchronous motion.

Please refer to Figure 3, the main feeding mechanism 30 under this creation A feed shaft 34 is formed by a first feed shaft 32 and a coaxial second feed shaft 33. The first feed shaft 32 is provided with a first clutch assembly 35 and is assembled with the pulley 55. A second clutch assembly 36 is disposed on the two feed shafts 33, and the feed wheel 31 is controlled by a group of lower transmission members 37.

This creation is mainly composed of a swinging device 351, 361, two clutch sets 352, 362 and two links 353, 363 to form a two-way push-like first clutch assembly 35 and a second clutch assembly 36, since the first clutch assembly 35 and the second clutch assembly 36 are identical in structure, There is only a difference in the connection relationship between the two, and therefore, the structural design is described only by the second clutch assembly 36 described above.

Referring to Figure 4, the second clutch assembly 36 is created. The swinging device 361 is provided with a cam 361a, a swing arm 361b, a push ring 361c and a roller 361d. The cam 361a is provided for driving a lower shaft 38 of the hook, and the surface of the cam 361a is provided with a curved change guide. In the guide groove, the swing arm 361b is coupled to the push ring 361c in the axial direction of the swing, and the push ring 361c is inserted through the second feed shaft 33, and the roller 361d is coupled to the upper portion. One end of the swing arm 361b is embedded in the guide groove of the cam 361a, and the other end of the swing arm 361b forms a shaft hole for a movable support shaft 361e to be movably disposed.

The two clutch groups 362 are mounted on the second feeding shaft 33 And the movable clutch ring 361 has two outer ring 362a, a rotor 362b, a plurality of elastic members (not shown), a plurality of rollers 362c, and a plurality of positioning positions. a claw 362d, a cover plate 362e, and a link pin 362f fixed to the outer ring 362a, wherein the rotor 362b is fixed to the second feed shaft 33 and located inside the outer ring 362a, and the outer circumference of the rotor 362b is plural The recess 362g is provided with the elastic member and the roller 362c, and each of the recesses 362g is respectively provided with a pin (not shown), and the pin is movably disposed through the two mutually opposite positioning claws 362d. The positioning claw 362d pushes the roller 362c pressed between the outer ring 362a and the wall surface of the rotor 362b by the elastic member; the cover plate 362e is coupled to the outer ring 362a, and the outer ring 362a has an opening 362h for each A positioning claw 362d passes through and abuts against the above-mentioned push ring 361c.

The cam 361a rotates with the lower shaft 38 to drive the above The swing arm 361b swings to drive the push ring 361c to move axially. When the push ring 361c approaches one of the two clutch sets 362, the outer ring 362a and the rotor 362b are in a released state, and the other clutch group is away from the clutch group 361b. The push ring 361c is in a clamped state.

One end of the two links 363 is commonly coupled to the linkage mechanism 40, and the other end is respectively movably coupled with the connecting rod pins 362f of the two clutch groups 362 to intermittently drive the two clutch groups 362, thereby causing the second feeding shaft 33 to perform the same direction intermittent rotational movement. The lower feed wheel 31 is driven.

In addition, the two links 353 of the first clutch assembly 35 are The end is connected to the linkage mechanism 40 and the differential adjustment mechanism 60, respectively, and the other end is also a link pin (illustration) respectively corresponding to the two clutch groups 352. The mutual activities are combined to intermittently drive the two clutch groups 352, so that the first feeding shaft 32 is rotated in the same direction intermittently to facilitate driving the upper feeding wheel 21.

Please refer to FIG. 5, the creation linkage mechanism 40 has a The linkage shaft 41 parallel to the lower feed shaft 34 and reciprocatingly swings is controlled by a stitch adjustment mechanism (not shown), and the linkage shaft 41 has a first swing arm 42 and a second swing The arm 43, the first swing arm 42 and the first clutch assembly 35 are coupled to each other, and the second swing arm 43 is coupled to the second clutch assembly 36. As shown in FIG. 2, one of the links 353 of the first clutch assembly 35 is connected to the first swing arm 42, and the other link 353 is connected to the differential adjustment mechanism 60, and the second The two links 363 of the clutch assembly 36 are simultaneously connected to both end faces of the second swing arm 43.

Please refer to Figure 6 and Figure 7, this creation of differential adjustment The mechanism 60 has a differential swing arm 61. One end of the differential swing arm 61 is pivotally disposed on the linkage shaft 41, and has a guide slot 611 extending toward the other end. The guide slot 611 has a slider that can slide relative to the inside. 62. The slider 62 is respectively connected to the connecting rod 353 of the first clutch assembly 35 and an adjusting device 63 by a connecting rod.

The adjusting device 63 is provided with a vertically arranged sliding link 64. The lower end of the sliding link 64 is partially connected to the slider 62, and the upper end extends upward to the pillar 13 to assemble an output swing arm 65. The output swing arm 65 is pivotally connected to the above. The transmission rod 66 extending outside the pillar 13 is finally pivotally connected to the adjustment handle 67 by the transmission rod 66, so that the adjustment handle 67 is entirely exposed to the pillar 13 of the sewing machine 10. This makes it easy for the user to adjust the differential amount immediately according to the sewing demand. In the preferred embodiment illustrated, the exposed position of the adjustment handle 67 is adjacent to the operating position at which the stitch length is adjusted.

In addition, the adjusting device 63 further includes a positioning plate 68. And a fixing member 69, wherein the positioning handle 68 is located on the side of the adjusting handle 67, and has at least one sliding rail 681, and the fixing member 69 is located respectively with the adjusting handle 37. The two opposite sides of the positioning plate 68 are screwed to the adjusting handle 67 through the sliding rail 681, so that the adjusting handle 67 can be fixed by the screwing of the fixing member 69, or through the above The screw of the fixing member 69 is loosened, so that the adjustment handle 67 can be swung and displaced relative to the positioning plate 68.

Please refer to Figure 8, when the above adjustment handle 67 is swung up When the moving rod 66 is pivoted at the same time, the output swing arm 65 swings downward in the opposite direction, so that the slider 62 on the sliding link 64 will follow the guide groove 611 of the differential swing arm 61. The link 353 described above is synchronously displaced downward. Since the output stroke of the differential swing arm 61 is increased, the rotation angle of the first clutch assembly 35 acting on the needle feeding stroke is increased. At this time, the feeding amount of the upper feeding wheel 21 is greater than the feeding of the lower feeding wheel 31. The amount thus produces a positive differential feed effect.

Referring to FIG. 9, on the contrary, when the adjusting handle 67 swings downward, the transmission lever 66 will pivot at the same time so that the output swing arm 65 swings upward in the reverse direction, so that the sliding link 64 is The slider 62 displaces the guide groove 611 of the differential swing arm 61 in synchronization with the link 353. Since the output stroke of the differential swing arm 61 is reduced, the rotation angle of the first clutch assembly 35 acting on the needle feed stroke is reduced, and at this time, the feed amount of the upper feed wheel 21 will be smaller than the feed of the lower feed wheel 31. The amount thus produces an inverse differential feed effect.

The above embodiments are used for convenience only to illustrate that the present invention is not limited. In the spirit of the creative spirit, all kinds of simple deformations and modifications made by those skilled in the industry in accordance with the scope of the patent application and the creative description of the creation should still be It is included in the scope of the following patent application.

20‧‧‧Uploading agency

21‧‧‧Uploading wheel

22‧‧‧Upfeed shaft

23‧‧‧Upper transmission components

30‧‧‧Feed feeding mechanism

31‧‧‧下feeding wheel

32‧‧‧First feed shaft

33‧‧‧Second feed shaft

34‧‧‧Drawing shaft

35‧‧‧First clutch assembly

36‧‧‧Second clutch assembly

37‧‧‧Lower transmission components

38‧‧‧lower shaft

40‧‧‧ linkage agency

41‧‧‧ linkage axis

42‧‧‧First swing arm

43‧‧‧Second swing arm

50‧‧‧ Transmission components

51‧‧‧ Pulley

52‧‧‧First belt

53‧‧‧Relay wheel set

54‧‧‧Second belt

55‧‧‧ Pulley

60‧‧‧Differential adjustment mechanism

61‧‧‧Differential swing arm

63‧‧‧ adjustment device

64‧‧‧Sliding link

65‧‧‧ Output swing arm

67‧‧‧Adjustment handle

68‧‧‧ Positioning plate

69‧‧‧Fixed parts

Claims (5)

A sewing machine differential feeding device comprises: a lower feeding mechanism, a first feeding shaft and a coaxial second feeding shaft jointly form a feeding shaft, wherein the first feeding shaft is provided with a first clutch assembly, and the first a second clutch assembly is disposed on the two feed shafts; a linkage mechanism has a linkage shaft parallel to the lower feed shaft, and the linkage shaft is coupled to the first clutch assembly and the second clutch assembly respectively; a differential adjustment a mechanism assembled between the linkage shaft and the first clutch assembly; and an upper feeding mechanism having an upper feed shaft, and the upper feed shaft is coupled to the first feed shaft by a transmission assembly to enable the upper feeding mechanism The lower feeding mechanism is capable of synchronous movement; wherein the differential adjustment mechanism is capable of selectively increasing or decreasing a rotation angle of the first clutch assembly acting on the first feed shaft, thereby generating a positive differential corresponding to the second feed shaft Feeding or counter-differential feeding. According to the sewing machine differential feeding device of claim 1, wherein the differential adjustment mechanism has a differential swing arm, and one end of the differential swing arm is pivotally disposed on the linkage shaft and has a guide groove, and the inside of the guide groove The utility model has a slider, and the sliders respectively connect the first clutch assembly and an adjusting device with a connecting rod. The sewing machine differential feeding device according to claim 2, wherein the adjusting device is provided with a sliding link, one end of the sliding link is connected to the slider, and the other end is assembled to an output swing arm, and the output is The swing arm is pivotally connected to a transmission rod, and the transmission rod and the adjustment handle are pivotally connected to each other, so that the adjustment handles are all exposed outside the sewing machine. The sewing machine differential feeding device according to the third aspect of the invention, wherein the adjusting device further comprises a positioning plate and a fixing member, the positioning plate is located on one side of the adjusting handle, and has at least one sliding rail, and the fixing member is The adjusting handles are respectively located on opposite sides of the positioning plate, and are screwed to the adjusting handle through the sliding rails. The sewing machine differential feeding device according to the first aspect of the invention, wherein the transmission assembly is one of a belt mechanism, a chain group or a gear set.