JP2015131102A - Differential cloth feeding device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a differential cloth feeding device of a sewing machine changing relative velocity between two cloth feed wheels by combining a differential regulation mechanism to a coaxial clutch member.SOLUTION: A differential cloth feeding device of a sewing machine comprises a lower cloth feeding mechanism 30, an inter-dependent mechanism 40, a differential regulation mechanism 60 and an upper cloth feeding mechanism 20. The lower cloth feeding mechanism 30 has a lower cloth feed rod 34 formed by a first cloth feed rod 32 and a second cloth feed rod 33 which is coaxial with the first cloth feed rod 32. A first clutch member 35 is inserted in the first cloth feed rod 32. A second clutch member 36 is inserted in the second cloth feed rod 33. The inter-dependent mechanism 40 has an interlock shaft 41 parallel to the lower cloth feed rod 34. The interlock shaft 41 is connected to the first clutch member 35 and the second clutch member 36 respectively. The differential regulation mechanism 60 is attached between the interlock shaft 41 and the first clutch member 35.

Description

  The present invention relates to a sewing machine that changes a cloth feed amount between an upper cloth feed wheel and a lower cloth feed wheel, and in particular, a coaxial clutch member is combined with a differential adjustment mechanism to change a relative speed between two cloth feed wheels. The present invention relates to a differential cloth feeding device for a sewing machine.

  In general, the cloth feed process of the sewing machine includes a needle lower cloth feed process performed when the needle penetrates the cloth and a needle upper cloth feed process performed when the needle leaves the cloth. When performing the needle lowering cloth feeding process, the needle and the cloth material advance simultaneously, but at this time, the upper and lower cloth feeding wheels are synchronized so that the hole of the upper and lower layer cloth material does not stretch and the needle is not bent. Need to be rotated. When the needle reciprocates up and down during the needle upper cloth feed stroke, the upper and lower cloth feed wheels are adjusted asynchronously to control the feed amount of the upper cloth material relative to the lower cloth material.

  Normally, the sewing machine obtains a differential effect by changing the rotation speed of the upper and lower cloth feed wheels, but in most cases, the upper cloth feed mechanism of the sewing machine changes the length of the swing arm to adjust the needle interval and When the rotation speed of the upper cloth feed wheel is changed based on the rotation speed of the cloth feed wheel, and the rotation speeds of the upper cloth feed wheel and the lower cloth feed wheel are equal, the rotation speed of the upper cloth feed wheel is referred to as the synchronous rotation speed. Is faster than the synchronous rotation speed, it is called positive differential cloth feed, and when the rotation speed of the upper cloth feed wheel is slower than the synchronous rotation speed, it is called reverse differential cloth feed.

  A conventional roller-type cloth feed sewing machine uses a one-way bearing principle, and a differential cloth feed device can perform positive differential cloth feed and reverse differential cloth feed. If the sewing machine is not adjusted, the differential amount cannot be changed while the sewing machine is operating.To adjust, the measurement must be performed many times, and the distance between the needles that are normally adjusted on the sewing machine from the differential adjustment operating position is set. Since the distance to the operation position to be adjusted is long, the user cannot use it quickly and easily.

  Therefore, there has been a demand for a differential cloth feed adjusting device built in the sewing machine, which can improve the above-described disadvantages of the conventional sewing machine differential cloth feed device.

The object of the present invention is that two sets of two-way clutches are coaxially attached to the lower feed shaft, obtain a differential effect by a combination of adjusting mechanisms, the structure of the entire sewing machine is simplified, and the number of parts is reduced. An object of the present invention is to provide a sewing machine differential cloth feed device capable of lowering the center of gravity of the sewing machine.
Another object of the present invention is that when the sewing operation of the sewing machine is performed, the user can change the differential cloth feed amount between the upper and lower cloth feed wheels without stopping the sewing work. Another object of the present invention is to provide a differential cloth feeding device for a sewing machine that can perform sewing quickly and sew.

  In order to solve the above-mentioned problem, according to the first aspect of the present invention, a lower formed by a first cloth feed shaft and a second cloth feed shaft that is coaxial with the first cloth feed shaft. A lower cloth having a cloth feed shaft, a first clutch member inserted in the first cloth feed shaft, and a second clutch member inserted in the second cloth feed shaft A feed mechanism and a linkage shaft parallel to the lower cloth feed shaft, the linkage shaft being connected to the first clutch member and the second clutch member, respectively, and the linkage shaft A differential adjustment mechanism attached between the first clutch member and an upper cloth feed shaft, and the upper cloth feed shaft is connected to the first cloth feed shaft via a transmission member. An upper cloth feed mechanism in which the upper cloth feed mechanism and the lower cloth feed mechanism operate synchronously, and the differential adjuster Is configured to change the rotational speed of the second cloth feed shaft by selectively increasing / decreasing the rotation angle of the first clutch member with respect to the first cloth feed shaft. A differential cloth feed device for a sewing machine is provided that generates reverse differential cloth feed.

  The differential adjustment mechanism has a differential swing arm. The differential swing arm has one end pivotally attached to the interlocking shaft and a guide groove, and a slide block is arranged in the guide groove. It is preferable that the slide block is attached to the first clutch member and the adjusting device via a link.

  The adjusting device is provided with a sliding link, and one end of the sliding link is connected to the slide block, the other end is attached to the output swing arm, and a transmission rod is pivotally attached to the output swing arm. Preferably, the transmission rod is pivotally attached to the adjusting lever, and the entire adjusting lever is exposed from the sewing machine.

  The adjusting device has a positioning board and a fixing member, and the positioning board has at least one slide rail located on one side of the adjusting lever, and the fixing member and the adjusting lever are respectively positioned with the positioning lever. It is preferable that it is located on a different side of the panel, is inserted through the slide rail, and is connected to the adjustment lever.

  The transmission member is preferably a synchronizing means of any one of a belt set, a chain set, and a gear set.

The sewing machine differential cloth feed device of the present invention has the following effects (1) and (2).
(1) Two bidirectional clutch members are attached to a first cloth feed shaft and a second cloth feed shaft, which are coaxial with each other, and a differential swing arm is driven by an adjusting device. Since the rotation angle of the first clutch member can be changed, the user can obtain a differential effect by changing the rotation speed of the upper cloth feed wheel relative to the lower cloth feed wheel without stopping the sewing operation.
(2) Since the two clutch members are located at the base of the sewing machine, the overall structure of the sewing machine is simplified, the number of parts is reduced, and the center of gravity of the sewing machine can be lowered. In addition, since each of the adjustment lever, the positioning board, and the fixing member is exposed to the outside of the sewing machine, the operation can be easily performed at a location close to the needle interval.

FIG. 1 is a perspective view showing a state where a differential cloth feed device for a sewing machine according to an embodiment of the present invention is mounted in the sewing machine. FIG. 2 is a perspective view showing a differential cloth feeding device for a sewing machine according to an embodiment of the present invention. FIG. 3 is an exploded perspective view showing a lower cloth feed mechanism, an interlocking mechanism, a differential adjustment mechanism, a transmission member, and an upper cloth feed mechanism of a differential cloth feed device for a sewing machine according to an embodiment of the present invention. FIG. 4 is an exploded perspective view showing the lower cloth feed mechanism of FIG. FIG. 5 is an exploded perspective view showing the interlocking mechanism of FIG. 6 is an exploded perspective view showing the differential adjustment mechanism of FIG. FIG. 7 is a side view showing a state when the differential adjustment mechanism is attached to the lower cloth feed mechanism and the interlocking mechanism. FIG. 8 is a simplified diagram showing a state when the upper cloth feed transport amount is made larger than that of the lower cloth feed wheel by the adjustment differential lever. FIG. 9 is a simplified diagram showing a state when the upper cloth feed transport amount is made smaller than that of the lower cloth feed wheel by the adjusting differential lever.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited thereby.

  Please refer to FIG. 1 and FIG. As shown in FIGS. 1 and 2, the sewing machine 10 of the sewing machine differential cloth feeding device according to the embodiment of the present invention includes at least a part of the sewing head 11, a part of the base 12, and a column 13. It consists of a part.

  An upper cloth feed mechanism 20 that rotates the upper cloth feed wheel 21 is disposed in the sewing machine head 11 described above. A lower cloth feed mechanism 30 and an interlocking mechanism 40 are disposed in the base 12. The lower cloth feed mechanism 30 described above rotates the lower cloth feed wheel 31 and is connected to the interlock mechanism 40 to operate in cooperation. A transmission member 50 and a differential adjustment mechanism 60 are attached to a part of the above-described support column 13. Since the transmission member 50 has one end connected to the upper cloth feed mechanism 20 and the other end connected to the lower cloth feed mechanism 30, the upper cloth feed mechanism 20 and the lower cloth feed mechanism 30 operate synchronously. The above-described differential adjustment mechanism 60 is attached between the interlocking mechanism 40 and the lower cloth feed mechanism 30, and generates a relative speed change between the upper cloth feed wheel 21 and the lower cloth feed wheel 31 to make a difference. Get a dynamic effect.

  Please refer to FIG. 2 and FIG. As shown in FIGS. 2 and 3, the upper cloth feed mechanism 20 of the differential cloth feed apparatus for a sewing machine according to one embodiment of the present invention has an upper cloth feed shaft 22. One end of the upper cloth feed shaft 22 controls the upper cloth feed wheel 21 via a pair of upper transmission members 23, and the other end is attached to the transmission member 50. In a preferred embodiment, the transmission member 50 described above includes a belt wheel 51 to which the upper cloth feed shaft 22 is attached. A first belt 52 is attached to the belt wheel 51, and the second belt 54 is synchronously interlocked by a relay wheel set 53 around which the first belt 52 is wound. It is wound around the belt wheel 55 and connected to the lower cloth feed mechanism 30.

  The above-described transmission member 50 is configured by a belt set for convenience of explanation. However, the configuration of the transmission member 50 is not limited at all, and the effect of the synchronous motion can be obtained by other gear sets or chain sets. Good.

  Please refer to FIG. As shown in FIG. 3, the lower cloth feed mechanism 30 of the differential cloth feed device of the sewing machine according to the embodiment of the present invention is coaxial with the first cloth feed shaft 32 and the first cloth feed shaft 32. A lower cloth feed shaft 34 constituted by the second cloth feed shaft 33 is included. A first clutch member 35 is inserted through the first cloth feed shaft 32 and a belt wheel 55 is inserted. A second clutch member 36 is inserted into the above-described second cloth feed shaft 33 and controls the lower cloth feed wheel 31 via a set of lower transmission members 37.

  The present invention mainly comprises a first clutch member 35 and a second clutch member 36 that are pushed in both directions by swinging devices 351, 361, two clutch sets 352, 362 and two links 353, 363, The first clutch member 35 and the second clutch member 36 have exactly the same structure, but only the connection relationship is different. Therefore, the structure design will be described below using only the second clutch member 36.

  Please refer to FIG. As shown in FIG. 4, the swinging device 361 of the second clutch member 36 of the differential cloth feeding device for a sewing machine according to an embodiment of the present invention includes a cam 361a, a swinging arm 361b, a pushing ring 361c, and a roller. 361d. The lower shaft 38 of the rotary hook is inserted through the cam 361a, and an arcuate guide groove is formed on the surface of the cam 361a. The aforementioned swing arm 361b is coupled to the push ring 361c in the rotating axial direction. The second cloth feed shaft 33 is inserted into the above-described push ring 361c, the roller 361d is coupled to the end of the swing arm 361b, and is fitted into the guide groove of the cam 361a. A movable support shaft 361e is detachably inserted in a shaft hole formed at the other end of 361b.

  The two clutch sets 362 described above are attached to the second cloth feed shaft 33 and are detachably contacted with both sides of the push ring 361c of the swing device 361. The above-described clutch set 362 includes an outer stopper ring 362a, a rotor 362b, a plurality of elastic members (not shown), a plurality of rolling elements 362c, a plurality of positioning claws 362d, a lid 362e, and an outer stopper ring. Link pin 362f fixed to 362a. The above-described rotor 362b is fixed to the second cloth feed shaft 33 and is positioned in the outer stopper ring 362a. A plurality of recesses 362g in which the elastic member and the rolling element 362c are disposed are formed on the outer periphery of the rotor 362b. A pin (not shown) is installed in each of the recesses 362g. The pin is detachably inserted in the opposite direction to the positioning claw 362d, and is pressed by the positioning claw 362d so that the elastic member is an outer stopper. The rolling element 362c between the ring 362a and the wall surface of the rotor 362b is pressed. The above-described lid 362e is coupled to the outer stopper ring 362a, and the positioning claws 362d are inserted through the openings 362h formed in the outer stopper ring 362a and are brought into contact with the push ring 361c.

  The cam 361a described above causes the swing arm 361b to swing with the rotation of the lower shaft 38, and moves the push ring 361c in the axial direction. When the above-described push ring 361c approaches one of the two clutch sets 362, the outer stopper ring 362a and the rotor 362b are released, and the other clutch group is separated from the push ring 361c. A clamping state is formed.

  One end of the two links 363 described above is connected to the interlock mechanism 40, and the other end is detachably coupled to the link pins 362f of the two clutch groups 362 described above, so that the two clutch sets 362 described above are intermittently changed. And the second cloth feed shaft 33 is intermittently rotated in the same direction to drive the lower cloth feed wheel 31.

  Further, one end of each of the two links 353 of the first clutch member 35 is connected to the interlocking mechanism 40 and the differential adjustment mechanism 60, and the other end is similarly connected to the connection pin (see FIG. (Not shown) is detachably coupled, and the above-described two clutch sets 352 are intermittently driven alternately, and the above-described first cloth feed shaft 32 is intermittently rotated in the same direction, whereby the upper cloth feed wheel 21 is driven. Drive.

  Please refer to FIG. As shown in FIG. 5, the interlocking mechanism 40 of the differential cloth feeding device for a sewing machine according to one embodiment of the present invention has an interlocking shaft 41 that swings in parallel with the lower cloth feeding shaft 34. The swinging amount of the interlocking shaft 41 is controlled by a needle distance adjusting mechanism (not shown). The interlocking shaft 41 has a first swing arm 42 and a second swing arm 43. The first swing arm 42 is connected to the first clutch member 35. The second swing arm 43 described above is connected to the second clutch member 36. As shown in FIG. 2, the first clutch member 35 described above has one link 353 connected to the first swing arm 42 and the other link 353 connected to the differential adjustment mechanism 60. The two links 363 of the second clutch member 36 described above are connected to the two end surfaces of the second swing arm 43.

  Please refer to FIG. 6 and FIG. As shown in FIGS. 6 and 7, the differential adjustment mechanism 60 of the differential cloth feed device for a sewing machine according to an embodiment of the present invention has a differential swing arm 61. The differential swing arm 61 has a guide groove 611 having one end pivotally attached to the interlocking shaft 41 and extending toward the other end. A slide block 62 that slides relatively is disposed in the guide groove 611, and the slide block 62 is connected to the link 353 of the first clutch member 35 and the adjusting device 63 via a connecting rod. .

  A sliding link 64 is vertically arranged in the adjusting device 63 described above. The above-described sliding link 64 has a lower end located at a part of the base 12 connected to the slide block 62 and an upper end extending upward until reaching a part of the column 13 to which the output swing arm 65 is attached. The output swing arm 65 is pivotally attached to a transmission rod 66 extending toward the column 13, and finally the transmission rod 66 is pivotally attached to the adjustment lever 67, and the entire adjustment lever 67 is exposed from the column 13 of the sewing machine 10. Yes. Therefore, the user can adjust the differential amount by simply turning the adjustment lever 67 as required by the sewing machine. In the preferred embodiment shown in the figure, the exposure position of the adjusting lever 67 described above is located at a position where the interval between the needles can be easily adjusted.

  The adjusting device 63 described above further includes a positioning board 68 and a fixing member 69, and forms a positioning means for the adjusting lever 67. The positioning board 68 described above is located on one side of the adjustment lever 67 and has at least one slide rail 681. The fixing member 69 described above is positioned on a different side of the adjustment lever and the positioning board 68, and is inserted into the slide rail 681 and connected to the adjustment lever 67. As described above, the fixing member 69 can be tightened to fix the position of the adjusting lever 67, or the fixing member 69 can be loosened to displace the adjusting lever 67 with respect to the positioning board 68.

  Please refer to FIG. As shown in FIG. 8, when the adjusting lever 67 is swung upward, the transmission rod 66 is rotated around the pivot, and the output swing arm 65 is swung downward in the opposite direction. The slide block 62 on the slide link 64 is displaced downward along the guide groove 611 of the differential swing arm 61 in synchronization with the link 353. When the output stroke of the differential swing arm 61 is increased, the first clutch member 35 acts on the upper cloth feed stroke of the needle to increase the rotation angle. At this time, the cloth feed amount of the upper cloth feed wheel 21 is reduced to the lower cloth feed. It becomes larger than the cloth feed amount of the wheel 31, and the effect of positive / differential cloth feed can be obtained.

  Please refer to FIG. As shown in FIG. 9, on the contrary, when the adjusting lever 67 is swung downward, the transmission rod 66 is rotated around the pivot and the output swing arm 65 is swung upward in the opposite direction. Then, the slide block 62 on the slide link 64 is displaced upward along the guide groove 611 of the differential swing arm 61 in synchronization with the link 353. When the output stroke of the differential swing arm 61 is reduced, the first clutch member 35 acts on the upper cloth feed stroke of the needle and the rotation angle is reduced. At this time, the cloth feed amount of the upper cloth feed wheel 21 is reduced to the lower cloth feed. It becomes smaller than the feed amount of the wheel 31, and the effect of the reverse differential feed amount can be obtained.

  While the preferred embodiments of the present invention have been disclosed above, as may be appreciated by those skilled in the art, they are not intended to limit the invention in any way. Various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the claims of the present invention should be construed broadly including such changes and modifications.

DESCRIPTION OF SYMBOLS 10 Sewing machine 11 Sewing head 12 Base 13 Strut 20 Upper cloth feed mechanism 21 Upper cloth feed wheel 22 Upper cloth feed shaft 23 Upper transmission member 30 Lower cloth feed mechanism 31 Lower cloth feed wheel 32 First cloth feed shaft 33 Second cloth Feed shaft 34 Lower cloth feed shaft 35 First clutch member 36 Second clutch member 37 Lower transmission member 38 Lower shaft 40 Interlocking mechanism 41 Interlocking shaft 42 First swing arm 43 Second swing arm 50 Transmission member 51 Belt wheel 52 First belt 53 Relay wheel set 54 Second belt 55 Belt wheel 60 Differential adjustment mechanism 61 Differential swing arm 62 Slide block 63 Adjustment device 64 Slide link 65 Output swing arm 66 Transmission rod 67 Adjustment lever 68 Positioning board 69 Fixing member 351 Oscillating device 352 Clutch set 353 Link 361 Oscillating device 361a Cam 361b Oscillating arm 361c Pushing ring 361d Roller 361e Movable support shaft 362 Clutch set 362a Outer stopper ring 362b Rotor 362c Rolling body 362d Positioning claw 362e Lid 362f Link pin 362g Recess 362h Opening 363 Link 611 Guide groove 681 Slide rail

Claims (5)

A lower cloth feed shaft formed by a first cloth feed shaft and a second cloth feed shaft that is coaxial with the first cloth feed shaft; A lower cloth feed mechanism in which a second clutch member is inserted in the second cloth feed shaft,
An interlocking shaft parallel to the lower cloth feed shaft, the interlocking shaft being connected to the first clutch member and the second clutch member,
A differential adjustment mechanism attached between the interlocking shaft and the first clutch member;
The upper cloth feed shaft has an upper cloth feed shaft, and the upper cloth feed mechanism and the lower cloth feed mechanism are operated in synchronization by the upper cloth feed shaft being connected to the first cloth feed shaft via a transmission member. A feeding mechanism,
The differential adjustment mechanism selectively increases or decreases the rotation angle of the first clutch member with respect to the first cloth feed shaft, thereby changing the rotation speed of the second cloth feed shaft to correct the rotation speed. A differential cloth feed device for a sewing machine that generates differential cloth feed or reverse differential cloth feed. The differential adjustment mechanism has a differential swing arm,
The differential swing arm has a guide groove with one end pivotally attached to the interlocking shaft,
A slide block is disposed in the guide groove,
The differential cloth feed device for a sewing machine according to claim 1, wherein the slide block is attached to the first clutch member and the adjusting device via a link. The adjusting device is provided with a sliding link,
The sliding link has one end connected to the slide block, the other end attached to an output swing arm, a transmission rod pivotally attached to the output swing arm, the transmission rod pivotally attached to an adjustment lever, and the adjustment The differential cloth feed device for a sewing machine according to claim 2, wherein the entire lever is exposed from the sewing machine. The adjusting device has a positioning board and a fixing member,
The positioning board has at least one slide rail located on one side of the adjustment lever;
4. The sewing machine differential according to claim 3, wherein the fixing member is positioned on a different side of the positioning board and the adjusting lever, and is inserted into the slide rail and connected to the adjusting lever. 5. Cloth feeding device.   2. The differential cloth feeding device for a sewing machine according to claim 1, wherein the transmission member is a synchronizing means of any one of a belt set, a chain set, and a gear set.

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