Patent Application
20200087826
The present application claims the benefit of priority of Vietnamese Patent Application No. 1-2018-04116, filed on Sep. 18, 2018, the content of which is incorporated herein by reference.
The present invention relates to a needle bar mechanism of a sewing machine for selectively using two needle bars to perform sewing.
A needle bar mechanism of a two-needle sewing machine having the one-needle stop function of selecting stopping upper-to-lower movement of a pair of needle bars includes the pair of needle bars having first and second engagement holes, a needle bar support body configured to separately support the pair of needle bars such that the pair of needle bars is movable up and down, a needle bar upper-to-lower movement mechanism configured to move each needle bar up and down by means of a needle bar connecting stud configured to separately hold the pair of needle bars, a clutch mechanism configured to switch between a holding state and a release state by the needle bar connecting stud, and an anti-drop mechanism configured to hold the needle bar in the release state by the needle bar connecting stud at an upper standby position (see, e.g., JP-A-2006-087578).
A typical sewing machine has independent clutch mechanisms each corresponding to the right and left needle bars 101.
This clutch mechanism includes a clutch lever 102, a needle bar clutch 103 and a needle bar clutch stopper 104, a release pin 105, and a slider 106.
A not-shown needle bar connecting stud is moved up and down by a sewing machine motor.
The needle bar clutch 103 is supported to move back and forth. When the needle bar clutch 103 retreats, a back end portion is fitted in a fitting hole 101a formed at the needle bar 101 (see
The clutch lever 102 forms a bell crank, and is supported by the needle bar connecting stud to rotate about an axis along a right-to-left direction. Moreover, a lower end portion of the clutch lever 102 is coupled to a front end portion of the needle bar clutch 103. An upper end portion of the clutch lever 102 is pressed upward by a spring 107 such that the needle bar clutch 103 retreats toward the fitting hole 101a.
The slider 106 is slidable in the right-to-left direction. A protruding portion 106a of the slider 106 can be selectively arranged right above each of the left clutch lever 102, the right clutch lever 102, and the release pin 105.
A front end portion of the needle bar clutch stopper 104 is supported by the needle bar connecting stud to rotate about an axis along the right-to-left direction. Moreover, an upward claw 104a is provided at a back end portion of the needle bar clutch stopper 104. In addition, the back end portion of the needle bar clutch stopper 104 is pressed upward by a spring 108.
The claw 104a of the needle bar clutch stopper 104 can be locked at the back end portion of the needle bar clutch 103. Thus, the locked needle bar clutch 103 is restricted from retreating. Moreover, the needle bar clutch 103 is held in a state in which the needle bar clutch 103 cannot be fitted in the fitting hole 101a of the needle bar 101.
The release pin 105 is supported by the needle bar connecting stud to move up and down. In addition, the release pin 105 is arranged so that a lower end portion thereof can contact a back end upper portion of the needle bar clutch stopper 104. Note that the release pin 105 is arranged so that the release pin 105 can contact any of the right and left needle bar clutch stoppers 104.
For example, in a case where the typical needle bar mechanism switches the right needle bar 101 in the holding state to the release state and switches the left needle bar 101 in the release state to the holding state, the protruding portion 106a of the slider 106 is first arranged right above the release pin 105 as illustrated in
When the needle bar connecting stud is lifted in this state, a state of
By retreating of the needle bar clutch 103, a lower end portion of the lever member in the left needle bar 101 rotates backward. Then, the needle bar 101 in the holding state by the anti-drop mechanism is released. Thus, the left needle bar 101 is movable up and down together with the needle bar connecting stud.
Next, as illustrated in
When the needle bar connecting stud is lifted in this state, a state of
The claw 104a of the needle bar clutch stopper 104 biased upward by the spring 108 is locked at the back end portion of the advanced needle bar clutch 103. In this manner, the needle bar clutch 103 is held not to retreat.
By advancing of the needle bar clutch 103, the lower end portion of the lever member in the right needle bar 101 rotates forward. Then, by the anti-drop mechanism, the needle bar 101 is held at the upper standby position.
As described above, switching of the right and left needle bars is performed.
However, as described above, in the case of switching the right and left needle bars to be moved up and down, the typical needle bar mechanism needs to cause the protruding portion 106a of the slider 106 to collide with the release pin 105, thereby switching the needle bar 101 from the release state to the holding state. Subsequently, the typical needle bar mechanism needs to cause the protruding portion 106a of the slider 106 to collide with the clutch lever 102 in the holding state, thereby switching the needle bar 101 from the holding state to the release state.
Thus, in the case of switching the right and left needle bars to be moved up and down during sewing, the slider 106 needs to be collided twice. Thus, this causes a problem that, between these collisions, simultaneous needle locations of both of the right and left needle bars certainly occurs.
This case cannot respond to a demand for complete needle handling only with one needle.
The present invention is intended to perform switching from one needle bar to the other needle bar without simultaneous needle location of two needle bars.
A needle bar mechanism of a sewing machine according to the present invention, including a needle bar connecting stud 14, two needle bars 11, a slider 26, and an interlocking mechanism 25, wherein the needle bar connecting stud 14 includes, corresponding to the two needle bars 11, two needle bar clutches 22, two clutch levers 21, two needle bar clutch stoppers 23, and two deactivating members 24, the slider 26 is configured to selectively collide, at the time of lifting of the needle bar connecting stud 14, with the clutch lever 21 and the deactivating member 24 corresponding to either one of the two needle bars 11, thereby pushing down the clutch lever 21 and the deactivating member 24, each needle bar clutch 22 is configured such that the needle bar 11 is held by the needle bar connecting stud 14 by fitting of the needle bar clutch 22 into a fitting hole 112 provided at the needle bar 11, each clutch lever 21 is, at a center portion thereof, rotatably supported by the needle bar connecting stud 14, one end of each clutch lever 21 is biased upward by a clutch spring 211, another end of each clutch lever 21 is coupled to the needle bar clutch 22, each clutch lever 21 is configured such that when the clutch lever 21 is selectively pushed down by the slider 26, the needle bar clutch 22 fitted in the fitting hole 112 is separated from the fitting hole 112 by rotation operation of the clutch lever 21, each needle bar clutch stopper 23 is, at a center portion thereof, rotatably supported by the needle bar connecting stud 14, one end of each needle bar clutch stopper 23 is inserted into a frame portion 241 provided at the deactivating member 24, another end of each needle bar clutch stopper 23 has a claw 231, and is biased toward the needle bar clutch 22 by a stopper spring 232, each needle bar clutch stopper 23 is configured such that when the corresponding deactivating member 24 is selectively pushed down by the slider 26, the claw 231 is locked at a groove 222 provided at the needle bar clutch 22 to restrict movement of the needle bar clutch 22 into the fitting hole 112, each deactivating member 24 is configured such that the claw 231 locked at the groove 222 is separated from the groove 222 by the rotating needle bar clutch stopper 23 rotated by contact between one end of the needle bar clutch stopper 23 and an inner side lower portion 241a of the frame portion 241 at the time of lifting of the deactivating member 24, and the interlocking mechanism 25 is configured to interlock the two deactivating members 24 such that one of the deactivating members 24 is lifted when the other deactivating member 24 is selectively pushed down.
With the above-described configuration, the present invention can switch two needle bars held by the needle bar connecting stud by single simultaneous collision between the clutch lever and the deactivating member.
Thus, occurrence of simultaneous needle location of two needle bars can be avoided.
Hereinafter, an embodiment of the present invention will be described in detail with reference to
As illustrated in
In description below, in the figures, “U” indicates an upper side, “D” indicates a lower side, “L” indicates a left side, “R” indicates a right side, “F” indicates a front side, and “B” indicates a back side.
The needle bar mechanism 10 includes a swinging frame 13, the needle bar connecting stud 14, the clutch mechanism 20, a needle bar switching mechanism 40, a needle bar holding mechanism 60, and a swinging mechanism 70.
The swinging frame 13 is configured to support two needle bars 11 such that two needle bars 11 are movable up and down.
The needle bar connecting stud 14 is configured to selectively hold two needle bars 11, thereby providing upper-to-lower reciprocation operation to the held needle bars 11.
The clutch mechanism 20 is configured to hold and release two needle bars 11 by the needle bar connecting stud 14.
The needle bar switching mechanism 40 is configured to input, to the clutch mechanism 20, switching between a holding state and a release state of two needle bars 11 by the needle bar connecting stud 14.
The needle bar holding mechanism 60 is configured to hold, at an upper standby position as a top dead point, the needle bar 11 released from the needle bar connecting stud 14 by the clutch mechanism 20.
The swinging mechanism 70 is configured to swing the swinging frame 13 to determine the positions of the right and left needle bars 11 such that needle location of the sewing needle 12 of one of two needle bars 11 at the pinhole 3 is allowed.
Hereinafter, these configurations will be described in detail.
As illustrated in
The swinging frame 13 extends in an upper-to-lower direction in the sewing machine arm portion 1a. Moreover, the swinging frame 13 supports two needle bars 11 with two needle bars 11 being arranged parallel to each other in a right-to-left direction.
A lower end portion of the swinging frame 13 is swingable in the right-to-left direction by the spindle 131. Thus, the swinging frame 13 swings to the right side such that needle location of the sewing needle 12 of the left needle bar 11 at the pinhole 3 is allowed. Moreover, the swinging frame 13 swings to the left side such that needle location of the sewing needle 12 of the right needle bar 11 at the pinhole 3 is allowed.
Note that in each figure, the swinging frame 13 is not inclined. That is, the swinging frame 13 is at a neutral position. Thus, two needle bars 11 are parallel to each other along the upper-to-lower direction. The configuration of the swinging frame 13 and a peripheral configuration thereof in such a state are illustrated in the figure. Moreover, unless otherwise provided, the swinging frame 13 is assumed to be at the neutral position in description of each configuration below.
As illustrated in
Moreover, as illustrated in
The needle bar connecting stud 14 supports other configurations of the clutch mechanism 20 than a slider 26.
As illustrated in
The transmission mechanism 73 is configured to rotate, according to advancing and retreating movement operation of the piston rod of the air cylinder 72, the swinging shaft 71 clockwise or counterclockwise as viewed from the front within a predetermined angle range.
The swinging arm 74 extends downward from the swinging shaft 71. By rotation operation of the swinging shaft 71, an extending end portion of the swinging arm 74 rotates in the right-to-left direction.
At the rotating end portion of the swinging arm 74, a square piece 75 is equipped to rotate about an axis along the front-to-back direction. The square piece 75 is formed at a back surface of the lower end portion of the swinging frame 13, and is fitted in a square groove extending along the upper-to-lower direction. The square piece 75 is slidable along the square groove.
Clockwise or counterclockwise rotation operation of the swinging arm 74 is performed by the swinging shaft 71 and the air cylinder 72. At this point, the swinging arm 74 provides, via the square piece 75, leftward swing or rightward swing to the swinging frame 13. Accordingly, the position of the swinging frame 13 is determined at such a position that needle location of the sewing needle 12 of the right needle bar 11 at the pinhole 3 is allowed or such a position that needle location of the sewing needle 12 of the left needle bar 11 at the pinhole 3 is allowed.
When the swinging arm 74 rotates clockwise or counterclockwise, the rotating end portion of the swinging arm 74 generates displacement in the upper-to-lower direction. That is, the square piece 75 is slidable along the square groove of the swinging frame 13, and therefore, such displacement in the upper-to-lower direction is allowed.
The needle bar holding mechanism 60 is built in an upper portion of the swinging frame 13. Each needle bar 11 has a holding hole formed at a front surface of the vicinity of an upper end portion of the needle bar 11. The needle bar holding mechanism 60 includes two not-shown fitting pins to be each fitted to the holding holes of the needle bars 11. These fitting pins are pressed backward by springs. Thus, when the needle bar 11 is lifted to the top dead point by the upper shaft 4 and the needle bar crank 5, the fitting pin is pushed into the holding hole. In this manner, the fitting pin can hold the needle bar 11 at the upper standby position.
Note that a lever member 111 is built in the needle bar 11 along a longitudinal direction thereof. The lever member 111 is, at a center portion thereof, rotatably supported by the needle bar 11, and therefore, upper and lower end portions of the lever member 111 are rotatable in the front-to-back direction. When the needle bar 11 is held at the needle bar connecting stud 14 by the clutch mechanism 20, the lower end portion of the lever member 111 is pressed backward by the clutch mechanism 20 (see
The clutch mechanism 20 includes clutch levers 21, needle bar clutches 22, needle bar clutch stoppers 23, deactivating members 24, an interlocking mechanism 25, and the slider 26.
Moreover, the clutch levers 21, the needle bar clutches 22, the needle bar clutch stoppers 23, and the deactivating members 24 are, one by one, separately provided corresponding to the right and left needle bars 11.
The right and left needle bar clutches 22 can separately maintain the right and left needle bars 11 at the holding state by the needle bar connecting stud 14. By rotation operation, the right and left clutch levers 21 can separately switch the right and left needle bar clutches 22 from the holding state to the release state by the needle bar connecting stud 14. The right and left needle bar clutch stoppers 23 can separately restrict switching of the right and left needle bar clutches 22 to the holding state. By lifting of the right and left deactivating members 24, a switching restricted state of the right and left needle bar clutch stoppers 23 can be separately deactivated.
The interlocking mechanism 25 can interlock two deactivating members 24 such that these two deactivating members 24 move opposite to each other in the upper-to-lower direction.
The slider 26 is movable in the right-to-left direction. At the time of lifting of the needle bar connecting stud 14, the slider 26 can selectively come into collision with the left clutch lever 21 and the left deactivating member 24 or the right clutch lever 21 and the right deactivating member 24, thereby pushing these components downward.
Each needle bar clutch 22 is supported by the needle bar connecting stud 14 to move in the front-to-back direction. With this configuration, a back end portion of such a needle bar clutch 22 can move to be engaged with or disengaged from the needle bars 11 penetrating the needle bar connecting stud 14 in the upper-to-lower direction. When the needle bar clutch 22 retreats, a protrusion 221 of the back end portion is fitted in a fitting hole 112 formed at the needle bar 11 (see
Moreover, by fitting of the protrusion 221 of the needle bar clutch 22 into the fitting hole 112, the needle bar connecting stud 14 and the needle bar 11 are coupled together via the needle bar clutch 22. The needle bar 11 moves up and down together with the needle bar connecting stud 14.
Each clutch lever 21 is bent at the center thereof as viewed in the right-to-left direction. Each clutch lever 21 forms a bell crank. A center portion of the clutch lever 21 is supported by the needle bar connecting stud 14 to rotate about an axis along the right-to-left direction. Further, a lower end portion of the clutch lever 21 is coupled to a front end portion of the needle bar clutch 22. Moreover, an upper end portion of the clutch lever 21 is pressed upward by a clutch spring 211. Thus, when the clutch lever 21 rotates, the upper end portion of the clutch lever 21 is biased such that the protrusion 221 of the needle bar clutch 22 retreats toward the fitting hole 112.
As described above, the upper end portion of the clutch lever 21 can collide with the slider 26. As illustrated in
Each needle bar clutch stopper 23 is, at a center portion thereof in the front-to-back direction, supported by the needle bar connecting stud 14. Each needle bar clutch stopper 23 is rotatable about an axis along the right-to-left direction. Moreover, an upward claw 231 is provided at a back end portion of the needle bar clutch stopper 23. In addition, the back end portion of the needle bar clutch stopper 23 is pressed upward by a stopper spring 232.
The claw 231 of the needle bar clutch stopper 23 can be locked at a groove 222 of the back end portion of the needle bar clutch 22. The needle bar clutch 22 locked by the claw 231 is restricted from retreating, and is held at a state in which the needle bar clutch 22 cannot be fitted in the fitting hole 112 of the needle bar 11.
Moreover, a front end portion of the needle bar clutch stopper 23 is coupled to the deactivating member 24.
As illustrated in
As described above, an upper end portion of the deactivating member 24 can collide with the slider 26.
Moreover, a lower portion of the deactivating member 24 includes a rectangular frame portion 241 elongated in the upper-to-lower direction as viewed in the front-to-back direction. The front end portion of the needle bar clutch stopper 23 is inserted into the frame portion 241.
As illustrated in
When an upper end portion of the deactivating member 24 comes into collision with the slider 26, the deactivating member 24 is pushed downward. However, the sufficient clearance 242 is present between the inner side upper portion 241b of the frame portion 241 and the needle bar clutch stopper 23, and therefore, the inner side upper portion 241b of the frame portion 241 and one end of the needle bar clutch stopper 23 do not contact each other. Thus, lowering operation of the deactivating member 24 is not interfered. Moreover, the compression spring 243 is interposed in the clearance 242. Thus, rattling of the front end portion of the needle bar clutch stopper 23 can be reduced.
The right and left deactivating members 24 are coupled to each other by the interlocking mechanism 25. When one deactivating member 24 is lowered, the other deactivating member 24 is lifted. By such lifting, the inner side lower portion 241a of the frame portion 241 and the needle bar clutch stopper 23 come into contact with each other as illustrated in
As illustrated in
Each of the right and left end portions of the link member 251 is coupled to the upper end portion of the deactivating member 24 to rotate about an axis along the front-to-back direction.
The spindle member 252 is a hinge screw along the front-to-back direction. The link member 251 is supported to rotate about the axis along the front-to-back direction relative to the needle bar connecting stud 14.
By the interlocking mechanism 25, the right deactivating member 24 is lifted when the left deactivating member 24 is lowered, and the left deactivating member 24 is lifted when the right deactivating member 24 is lowered.
The slider 26 is arranged at the swinging frame 13. When the needle bar connecting stud 14 is lifted to the top dead point, the slider 26 is arranged at such a height that the upper end portions of the clutch lever 21 and the deactivating member 24 collide with the slider 26.
The slider 26 is supported by the swinging frame 13 to move in the right-to-left direction. Moreover, the position of the slider 26 is, by the needle bar switching mechanism 40, switched to any of three positions including a left position, a right position, and a neutral position therebetween. At the left position, the slider 26 collides with the left clutch lever 21 and the left deactivating member 24. At the right position, the slider 26 collides with the right clutch lever 21 and the right deactivating member 24. At the neutral position, the slider 26 does not collide with any of these components.
As illustrated in
The air cylinder 41 is a three-port two-stroke air cylinder. When the piston rod is retreated to the leftmost side, the position of the slider 26 is determined at the left position. Then, the position of the slider 26 is determined at the neutral position by a first step stroke for advancing rightward. Further, the position of the slider 26 can be determined at the right position by a full stroke for advancing to the rightmost side.
The support shaft 43 is, in a fixed manner, equipped at an upper surface of the sewing machine arm portion 1a with the support shaft 43 being along the right-to-left direction. Moreover, the support shaft 43 penetrates an upper end portion of the coupling plate 42, and supports the coupling plate 42 such that the coupling plate 42 is movable in the right-to-left direction.
The upper end portion of the coupling plate 42 is coupled to the piston rod of the air cylinder 41. Moreover, a lower end portion of the coupling plate 42 suspends from the support shaft 43, and is coupled to the slider 26. Thus, advancing/retreating movement operation of the piston rod of the air cylinder 41 can be transmitted to the slider 26.
Note that as described above, the slider 26 is supported by the swinging frame 13 swingable right to left. Thus, the position of the slider 26 fluctuates right to left. However, the coupling plate 42 is formed from a plate spring bendable right to left. Thus, the coupling plate 42 allows fluctuation in the position of the slider 26 in the right-to-left direction.
Needle bar switching operation by the needle bar mechanism 10 will be described with reference to
Initially, the left needle bar 11 is held by the needle bar connecting stud 14. Moreover, the right needle bar 11 is released by the needle bar connecting stud 14. An example of a case where the left needle bar 11 is, from this state, switched to the release state and the right needle bar 11 is switched to the holding state will be described.
The left needle bar 11 is in a state in which the left needle bar 11 moves up and down together with the needle bar connecting stud 14 to perform sewing. At the timing of lowering the needle bar connecting stud 14 to the vicinity of a bottom dead point, the air cylinder 41 of the needle bar switching mechanism 40 is actuated to switch the position of the slider 26 from the right position to the left position.
In this manner, when the needle bar connecting stud 14 is lifted toward the top dead point, the upper end portion of the left clutch lever 21 comes into collision with the first collision position P1 of the slider 26 (
By collision, the upper end portion of the left clutch lever 21 is pushed down against the clutch spring 211. Then, the left clutch lever 21 rotates. In association with such rotation, the left needle bar clutch 22 advances. Then, the protrusion 221 is pulled out of the fitting hole 112 of the left needle bar 11 (
In this manner, the lower end portion of the lever member 111 in the needle bar 11 rotates forward, and the upper end portion of the lever member 111 rotates backward. Thus, the left needle bar 11 is held at the upper standby position by the needle bar holding mechanism 60.
At the same time as collision of the left clutch lever 21, the upper end portion of the left deactivating member 24 comes into collision with the second collision position P2 of the slider 26, and is pushed down. In this state, the clearance 242 as the allowance is present between the left deactivating member 24 and the left needle bar clutch stopper 23. Thus, lowering operation is not transmitted to the front end portion of the needle bar clutch stopper 23. Moreover, the back end portion of the needle bar clutch stopper 23 is pressed upward by the stopper spring 232. Thus, when the needle bar clutch 22 advances as illustrated in
Further, at the same time as collision between the slider 26 and the left deactivating member 24, the interlocking mechanism 25 rotates about the spindle member 252 as a center. Accordingly, the right deactivating member 24 is lifted (
Thus, the right needle bar 11 is brought into the holding state by the needle bar connecting stud 14. Thus, switching of the needle bar 11 is performed such that needle handling is performed by upper-to-lower movement of the needle bar 11.
The needle bar mechanism 10 is provided with two deactivating members 24 each corresponding to two needle bars 11. The deactivating member 24 is lifted to deactivate the switching restricted state of the needle bar clutch stopper 23. Moreover, the needle bar mechanism 10 includes the interlocking mechanism 25 interlocking two deactivating members 24 such that these deactivating members 24 move opposite to each other in the upper-to-lower direction. Further, the needle bar mechanism 10 has such a structure that the slider 26 of the needle bar mechanism 10 comes, at the time of lifting of the needle bar connecting stud 14, into collision with the deactivating member 24 corresponding to the needle bar 11, the same one as the clutch lever 21 corresponds to, to push the deactivating member 24 downward.
Thus, when the slider 26 collides with and pushes down the clutch lever 21 and the deactivating member 24 corresponding to one needle bar 11, the other deactivating member 24 is lifted by the interlocking mechanism 25. Thus, for one needle bar 11, the needle bar clutch 22 is pulled out of the fitting hole 112 provided at the one needle bar 11 by rotation of the clutch lever 21 by single collision of the clutch lever 21 and the deactivating member 24 with the slider 26. Moreover, for the other needle bar 11, the restricted state of the needle bar clutch 22 by the needle bar clutch stopper 23 is deactivated by rotation of the deactivating member 24. Thus, switching of the needle bar 11 held by the needle bar connecting stud 14 can be performed by collision due to single lifting of the needle bar connecting stud 14.
Moreover, occurrence of simultaneous needle location of two needle bars 11 can be avoided. Thus, the needle bar mechanism 10 is specifically effective for a case where alternative needle location of two sewing needles 12 at the single pinhole 3 is performed as in the sewing machine 1.
The clearance 242 as the allowance for downward movement of the deactivating member 24 relative to the needle bar clutch stopper 23 is provided between the deactivating member 24 and the needle bar clutch stopper 23. Thus, when the deactivating member 24 comes into collision with the slider 26, the deactivating member 24 does not collide with the needle bar clutch stopper 23 because of the clearance 242. This can avoid a great load between the deactivating member 24 and the needle bar clutch stopper 23. Thus, occurrence of damage and deformation of the member can be reduced.
The compression spring 243 as the elastic body is interposed in the clearance 242 as the allowance. Thus, rattling of the needle bar clutch stopper 23 due to the clearance 242 can be reduced.
The interlocking mechanism 25 includes the link member 251 having, at the center portion thereof, the spindle member 252 as the point of support. Moreover, one end portion and the other end portion of the link member are each coupled to the separate deactivating members 24. The interlocking mechanism 25 has such a simple configuration, so that operation stability can be improved.
As long as the interlocking mechanism can move two deactivating members 24 opposite to each other in the upper-to-lower direction, other structures may be employed. For example, a configuration including rack gears 251A and a pinion gear 252A between two deactivating members 24 as in an interlocking mechanism 25A illustrated in
In this case, when the slider 26 comes into collision with and pushes down one deactivating member 24, the pinion gear 252A engaging the rack gear 251A of such a deactivating member 24 rotates. Then, the deactivating member 24 can be pushed up together with the other rack gear 251A.
In the above-described embodiment, the needle bar switching mechanism 40 is configured to move the slider 26 to any of three positions including the left position, the neutral position, and the right position. Note that it may be configured such that the slider 26 is moved to any of only two positions including the left position and the right position.
The needle bar mechanism of the sewing machine of the present disclosure may be the following first to sixth needle bar mechanisms of the sewing machine.
The first needle bar mechanism of the sewing machine includes a needle bar connecting stud; two needle bars; needle bar clutches 22, clutch levers 21, needle bar clutch stoppers 23, and deactivating members 24 provided, two by two, corresponding to two needle bars at the needle bar connecting stud 14; and a slider 26 configured to selectively collide, at the time of lifting of the needle bar connecting stud 14, with the clutch lever 21 and the deactivating member 24 corresponding to either one of the needle bars 11. The needle bar clutch 22 is configured such that the needle bar 11 is brought into a holding state at the needle bar connecting stud 14 by fitting into a fitting hole 112 provided at the needle bar 11. The clutch lever 21 is, at a center portion thereof, rotatably supported by the needle bar connecting stud 14. One end of the clutch lever 21 is biased upward by a clutch spring 211, and another end of the clutch lever 21 is coupled to the needle bar clutch 22. By rotation operation, switching is made to a release state in which the needle bar clutch 22 is separated from the fitting hole 112. The needle bar clutch stopper 23 is, at a center portion thereof, rotatably supported by the needle bar connecting stud 14. One end of the needle bar clutch stopper 23 is inserted into a frame portion 241 provided at the deactivating member 24, and another end of the needle bar clutch stopper 23 has a claw 231 and is biased toward the needle bar clutch by a stopper spring 232. The claw 231 is locked at a groove 222 provided at the needle bar clutch 22 to restrict switching from the release state to the holding state of the needle bar clutch 22. The deactivating member 24 is configured such that the claw 231 is separated from the groove 222 to deactivate a switching restricted state in such a manner that the needle bar clutch stopper 23 is rotated by contact between one end of the needle bar clutch stopper 23 and an inner side lower portion 241a of the frame portion 241 at the time of lifting of the deactivating member 24. An interlocking mechanism 25 is provided to interlock two deactivating members 24 such that two deactivating members 24 move opposite to each other in the upper-to-lower direction. When one end of the clutch lever 21 and the deactivating member 24 corresponding to one needle bar 11 selectively collided with the slider 26 at the time of lifting of the needle bar connecting stud 14 are pushed downward, the clutch lever 21 corresponding to one needle bar 11 rotates the needle bar clutch 22 in the direction of separating the needle bar clutch 22 from the fitting hole 112, thereby bringing the needle bar clutch 22 into the release state. Moreover, the deactivating member 24 corresponding to the other needle bar 11 is lifted by the interlocking mechanism 25, thereby deactivating the switching restricted state by the needle bar clutch stopper 23.
The second needle bar mechanism of the sewing machine is the first needle bar mechanism of the sewing machine, in which the clutch spring 211 biases such that the clutch lever 21 rotates in the direction of bringing the needle bar clutch 22 into the holding state.
The third needle bar mechanism of the sewing machine is the first or second needle bar mechanism of the sewing machine, in which a clearance 242 as an allowance is provided inside the frame portion 241 such that the deactivating member 24 is movable downward without contact between the inner side upper portion 241b of the frame portion 241 and one end of the needle bar clutch stopper 23.
The fourth needle bar mechanism of the sewing machine is any one of the first to third needle bar mechanisms of the sewing machine, in which a compression spring 243 is interposed in the clearance 242 as the allowance.
The fifth needle bar mechanism of the sewing machine is any one of the first to fourth needle bar mechanisms of the sewing machine, in which the interlocking mechanism is configured such that two deactivating members 24 are separately coupled to one end portion and the other end portion of the link member 251 having the point of support at the center thereof.
The sixth needle bar mechanism of the sewing machine is any one of the first to fourth needle bar mechanisms of the sewing machine, in which the interlocking mechanism has rack gears each provided at two deactivating members and a gear configured to engage both of two rack gears arranged facing in parallel to each other.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1-2018-04116 | Sep 2018 | VN | national |
