TW201527617A - Differential feeding device of sewing machine - Google Patents

Abstract

The present invention includes a lower feeding mechanism, a couple mechanism, a differential adjustment mechanism and an upper feeding mechanism. A lower feeding shaft is formed by a first feeding shaft and a second feeding shaft that are on the same axis to the lower feeding mechanism. The first feeding shaft passes through a first clutch assembly. The second feeding shaft passes through a second clutch assembly. In addition, the couple mechanism includes a couple shaft that is parallel to the lower feeding shaft, and the couple shaft is respectively connected to the first clutch assembly and the second clutch assembly. The differential adjustment mechanism is assembled in between the couple shaft and the first clutch assembly. Moreover, the upper feeding mechanism includes an upper feeding shaft. The upper feeding shaft is connected to the first feeding shaft by means of a transmission assembly, to enable the two feeding mechanisms to be operated simultaneously. Further, the differential adjustment mechanism of the present invention is able to selectively increase or decrease the angel of rotation of the feeding path that is operated by the first clutch assembly, thereby producing positive or negative differential feeding correspondingly.

Description

Sewing machine differential feeding device

The 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 object of the present invention is to provide a differential feeding sewing machine. The two sets of two-way clutches are coaxially mounted on the lower feeding shaft and cooperate with the adjusting mechanism to form a differential effect, so that the overall structure of the sewing machine simplifies the number of components, and the sewing machine can be effectively reduced. The center of gravity.

The secondary object of the present invention 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, thereby generating an immediate differential feeding sewing effect.

In order to achieve the above object, 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 differential adjustment mechanism of the present invention can selectively directly increase or decrease the rotational 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 differential adjustment mechanism of the present invention 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, an adjusting handle, a positioning plate and a fixing member, wherein one end of the sliding link is connected to the slider, and the other end is assembled to the output swing arm; the output is The swing arm is pivotally connected to the transmission rod; the transmission rod is pivotally connected to the adjustment handle; the positioning disc is located on one side of the adjustment handle and has at least one slide rail; and the fixing member is located at the same position as the adjustment handle The two sides of the disc are different from each other and are screwed to the adjusting handle through the above sliding rail. Wherein, the adjustment handle, the positioning plate and the fixing member are all exposed outside the sewing machine.

In a preferred embodiment, the exposed position of the adjustment handle of the present invention is located in the strut portion of the sewing machine and adjacent to the adjusted stitch distance 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 invention is characterized in that two bidirectional clutch assemblies are respectively mounted on the coaxial first feeding shaft and the second feeding shaft, and the differential swing arm is driven by the adjusting device to change the first clutch assembly when acting on the needle feeding stroke. The rotation angle allows the sewing person to directly change the rotation speed of the upper feed wheel relative to the lower feed wheel without having to stop the sewing operation, thereby forming 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 can simplify the number of components and lower 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 invention)

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

1 is a schematic view showing the inside of the sewing machine of the present invention; and 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 present invention as a lower feeding mechanism, a linkage mechanism, a differential adjustment mechanism, a transmission assembly, and an 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.

For a more detailed and detailed understanding and understanding of the structure, the use and the features of the present invention, the preferred embodiments are described in detail with reference to the drawings as follows: Referring to Figures 1 and 2 It is to be noted that the sewing machine 10 of the present invention mainly comprises a front portion 11 portion, a base portion 12 and a pillar portion 13.

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 FIG. 2 and FIG. 3 for the feeding mechanism of the present invention. 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-mentioned transmission assembly 50 is constituted by a belt set only for convenience of illustration, and does not limit the structural form of the transmission assembly 50, that is, the transmission assembly 50 can also be set to other gear sets or chain sets to achieve synchronous motion. Effect.

Referring to FIG. 3, the lower feeding mechanism 30 of the present invention mainly comprises a first feeding shaft 32 and a coaxial second feeding shaft 33 to form a lower feeding shaft 34. The first feeding shaft 32 is provided with a first The clutch assembly 35 is assembled with the pulley 55, and a second clutch assembly 36 is disposed on the second feed shaft 33, and the feed roller 31 is controlled by a group of lower transmission members 37.

The present invention mainly consists 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, due to the first clutch The assembly 35 is identical in structure to the second clutch assembly 36 described above, except that only the connection relationship is different between the two, and therefore, the structural design is described only by the second clutch assembly 36 described above.

Referring to FIG. 4, the swinging device 361 of the second clutch assembly 36 of the present invention is provided with a cam 361a, a swing arm 361b, a push ring 361c and a roller 361d for driving the lower shaft 38 of the hook. And the surface of the cam 361a is provided with a curved groove, and the swing arm 361b is coupled to the push ring 361c in the axial direction of the swing, and the push ring 361c is provided for the second feed shaft 33. 361d combination The 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 are respectively movably abutted against the two sides of the pushing ring 361c of the swinging device 361. The clutch group 362 has an outer retaining ring 362a, a rotor 362b, and a plurality of elastic members. (not shown), a plurality of rollers 362c, a plurality of positioning claws 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 at the above Inside the outer ring 362a, a plurality of recesses 362g are formed on the outer circumference of the rotor 362b, and the elastic member and the roller 362c are disposed. Further, a pin (not shown) is disposed inside each of the recesses 362g, and the pin is movably disposed. The positioning claw 362d is pushed by the positioning claw 362d to push the roller 362c pressed by the elastic member between the outer ring 362a and the wall surface of the rotor 362b; the cover plate 362e is coupled to the outer ring 362a. The outer ring 362a has an opening 362h for passing each of the positioning claws 362d and abutting against the push ring 361c.

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

One end of the two connecting rods 363 is coupled to the linking mechanism 40, and the other end is coupled to the connecting rod pins 362f of the two clutch groups 362, respectively, for intermittently rotating the two clutch groups 362, thereby enabling the second The feed shaft 33 performs a co-directional intermittent rotational movement to drive the lower feed wheel 31.

In addition, one end of the two links 353 of the first clutch assembly 35 is respectively coupled to the linkage mechanism 40 and the differential adjustment mechanism 60, and the other end is also a link pin with the two clutch groups 352 respectively. Show) 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.

Referring to FIG. 5, the interlocking mechanism 40 of the present invention has a linkage shaft 41 which is parallel to the lower feed shaft 34 and reciprocally oscillates. The amount of swing is controlled by a stitch adjustment mechanism (not shown), and the above The interlocking shaft 41 has a first swing arm 42 and a second swing arm 43. The first swing arm 42 and the first clutch assembly 35 are coupled to each other, and the second swing arm 43 and the second clutch assembly 36 are mutually coupled. connection. 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.

Referring to FIG. 6 and FIG. 7, the differential adjustment mechanism 60 of the present invention 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 facing the other. One end of the guiding groove 611 has a slider 62 which is relatively slidable, and the slider 62 is respectively connected with 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 disposed sliding link 64. The lower end of the sliding link 64 is partially connected to the slider 62, and the upper end is extended upward to the pillar 13 to assemble an output swing arm 65. The output swing arm 65 is pivotally connected to a transmission rod 66 extending toward the outside of the support post 13. Finally, an adjustment handle 67 is pivotally connected to the transmission rod 66 to expose the adjustment handle 67 to the support 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.

Referring to FIG. 8, when the adjusting handle 67 is swung upward, the transmission lever 66 will pivot at the same time so that the output swing arm 65 swings downward in the opposite direction, and the slider 62 on the sliding link 64 is caused. The guide groove 611 following the differential swing arm 61 is displaced downward in synchronization with the above-described link 353. 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 intended to be illustrative only, and are not intended to limit the scope of the present invention. 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 is assembled, and the other end is assembled to an output swing arm, and the output 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.