JP5197120B2 - Top sewing machine - Google Patents

Description

  The present invention relates to a top stitch sewing machine capable of adjusting the interval between a plurality of sewing needles.

As shown in FIG. 8, the upper stitch sewing machine has a plurality of stitches B formed in parallel by a plurality of sewing needles arranged in a line along a direction orthogonal to the cloth feeding direction (arrow A direction). This is a sewing machine that sews the upper decoration thread K to meander from side to side and sews it into parallel seams.
The conventional upper sewing machine shown below is a delivery arm type sewing machine (a so-called flat seamer type upper sewing machine). As shown in FIG. 9, the sewing machine has a fixed knife provided on the cloth presser 110 and a moving knife on two cloths conveyed with the edge portions pressed against each other and raised upward. By cooperating, the upper end of the end edge portion is cut off to align the end portions, and the aligned end portions are tilted to superimpose one on the other, and the top stitching is performed on the overlapped portion.

  In FIG. 9, the upper sewing machine 100 includes a needle bar 105 including four sewing needles 101 to 104 arranged in a line along a direction orthogonal to the cloth feeding direction (arrow A direction), and a sewing product. A cloth presser 110 for pressing a certain cloth from above, a cloth presser bar 111 for supporting the cloth presser 110 at its lower end, a press spring 112 for applying a cloth pressing pressure by the cloth presser 110 via the cloth presser bar 111, and a needle drop At this time, the carrier 121 and the hook 122 that hold the upper decorative yarn K in a tensioned state in cooperation so that the upper decorative yarn K crosses between the sewing needles 102 and 103 in the feeding direction, and the sewing machine motor makes full rotation. The main shaft 106 to be performed, the power transmission mechanism 130 for converting the total rotational motion of the main shaft 106 into a reciprocating motion and transmitting the reciprocating motion to the reciprocating rotational shaft 107, and the carrier 121 from the reciprocating rotational shaft 107 to the carrier 121. It includes a first transmission mechanism 140 which transmits the reciprocating rotational force, a second transmission mechanism 150 which transmits the reciprocating rotational force from reciprocating rotation axis 107 relative to the hook 122 Te.

The needle bar 105 is supported on a sewing machine frame (not shown) via a metal bearing so as to be movable up and down along the vertical direction. A needle clamp 108 is provided at the lower end of the needle bar 105. As described above, the four sewing needles 101 to 104 are held in a line along the direction orthogonal to the cloth feed direction. Yes.
A cloth presser bar 111 that holds the cloth presser 110 at its lower end is adjacent to the needle bar 105 and supported by a sewing machine frame (not shown) via a metal bearing so as to be movable up and down.
The reciprocating rotation shaft 107 is cylindrical, and a cloth presser bar 111 is inserted into the inner diameter of the cylinder. The reciprocating rotation shaft 107 is rotatably supported by a sewing machine frame (not shown) via a metal bearing 109, and the rotation center of the reciprocating rotation shaft 107 coincides with the axis of the cloth presser bar 111.

The power transmission mechanism 130 that imparts reciprocating rotation to the reciprocating rotation shaft 107 includes an eccentric cam 131 fixed to the main shaft 106, a reciprocating rod 132 that rotatably holds the eccentric cam 131 at one end, and a reciprocating motion. A shaft holding member 133 is connected to the other end portion of the rod 132 and holds the upper end portion of the reciprocating rotation shaft 107.
The reciprocating rod 132 is orthogonal to the main shaft 106 and oriented substantially in the horizontal direction. Since the eccentric cam 131 is eccentric with respect to the main shaft 106, when the main shaft 106 is driven to rotate, one end portion of the reciprocating rod 132 performs a revolving motion around the main shaft. When the reciprocating rod 132 performs a revolving motion at one end, only the horizontal component of the revolving motion is transmitted to the other end, and the other end performs a reciprocating motion substantially along the horizontal direction. The other end of the reciprocating rod 132 is connected to a shaft holding member 133 via a spherical bearing 132a, and a forward and backward movement along the extending direction of the reciprocating rod 132 is transmitted to the shaft holding member 133. As a result, the shaft holding member 133 performs a revolving motion around the presser bar 105 together with the reciprocating rotation shaft 107, and the reciprocating rotation shaft 107 performs reciprocating rotation. The other end of the reciprocating rod 132 moves linearly, but the movement along the circumference of the shaft holding member 133 is allowed by the action of the spherical bearing 132a.

10 is an enlarged perspective view showing the configuration around the cloth presser 110. FIG. 11 shows the cloth presser 110 with the carrier 121, the hook 122 supported by the cloth presser 110, and the transmission mechanisms 140 and 150 for transmitting operation to them. It is the perspective view omitted and shown.
The first transmission mechanism 140 includes a rotation arm 141 coupled to the lower end of the reciprocating rotation shaft 107, a transmission link 142 having one end coupled to the rotation end of the rotation arm 141, and the transmission link 142. And a lever shaft 143 having a lever tip connected to the other end thereof.
The rotation arm 141 has a recess 141 a that engages with a flange-shaped portion 107 a provided at the lower end of the reciprocating rotation shaft 107, and rotates around the presser bar 105 integrally with the reciprocating rotation shaft 107. Move. The rotating arm 141 extends in the radial direction around the presser bar 105 and is connected to one end of the transmission link 142 in the vicinity of one side surface of the extended rotating end. .
The lever shaft 143 extends in a direction orthogonal to the support shaft portion 143a rotatably supported by the cloth presser 110 with the shaft center along the vertical direction at the upper end portion of the support shaft portion 143a. The lever portion 143b is integrally formed. And the front-end | tip part of the lever part 143b is connected with the other end part of the transmission link 142, and the lower end part of the spindle part 143a pivotally supports the carrier 121.
With this configuration, the first transmission mechanism 140 constitutes a four-bar linkage mechanism having one node as the reciprocating rotation shaft 107, and the reciprocating rotation is transmitted to the carrier 121 in synchronization with the reciprocating rotation shaft 107. It has a structure.

The second transmission mechanism 150 is configured to use the rotation arm 141 in common with the first transmission mechanism 140, and one end is connected to the rotation arm 141 and the rotation end of the rotation arm 141. Transmission link 152 and a lever shaft 153 having a lever tip connected to the other end of the transmission link 152.
One end portion of the transmission link 152 is connected to the vicinity of the other side surface of the rotating end portion of the rotating arm 141.
The lever shaft 153 extends in a direction orthogonal to the support shaft portion 153a that is rotatably supported by the cloth presser 110 with the shaft center along the vertical direction, and an upper end portion of the support shaft portion 153a. The lever portion 153b is integrally formed. The distal end portion of the lever portion 153b is connected to the other end portion of the transmission link 152, and the lower end portion of the support shaft portion 153a supports the hook 122.
Similarly to the first transmission mechanism 140, the second transmission mechanism 150 also constitutes a four-bar linkage mechanism in which one node is a reciprocating rotation shaft 107, and the reciprocating rotation is synchronized with the reciprocating rotation shaft 107. Is transmitted to the hook 122.

12 to 14 show a state in which the upper decorative yarn K is held by the carrier 121 and the hook 122. FIG. Arrow A in the figure indicates the cloth feeding direction.
The carrier 121 moves forward and backward (in the direction in which the sewing needles 101 to 104 approach (FIG. 13)) and moves backward (rearward from the sewing needles 101 to 104 toward the front side in the cloth feeding direction (FIG. 14). )), And a cylindrical portion 121a and a claw portion 121b for guiding the upper decorative yarn K are formed at the rotating tip. The tubular portion 121a can hold the upper decorative yarn K even when the carrier 121 moves back and forth by inserting and holding the upper decorative yarn K, and the claw portion 121b holds the upper decorative yarn K only when moving forward and when moving backward. It has a releasable shape (for example, a shape in which the front is opened). The cylindrical portion 121a is located on the outer side (hereinafter referred to as the outer side) than the claw portion 121b, and the upper decorative yarn K fed from the yarn supply source is inserted from the outer side into the cylindrical portion 121a. Is done. When the carrier 121 moves forward, the tubular portion 121a reaches the outside (left side) 101 of the left outer needle (the leftmost sewing needle when the cloth feed direction F is the front), and the claw portion 121b is the left outer needle. 101 and the left middle needle 102 (the second sewing needle from the left when the cloth feed direction F is the front) is reached.

  The hook 122 is moved back and forth by reciprocating rotation (the direction in which the sewing needles 101 to 104 approach the right side of the sewing needles 101 to 104 (FIG. 13)) and retreats (separate from the sewing needles 101 to 104 opposite to the cloth feeding direction and to the left side). (Direction of FIG. 14) is repeated, and the carrier 121 and the forward / backward timing are the same. A hook 122 a that supplements the upper decorative thread K is formed at the rotating tip of the hook 122. The flange portion 122a protrudes downward from the bottom surface of the hook 122, and has a reverse structure in which a sharp tip portion is directed in the backward direction. As a result, when the hook 122 is retracted, it is possible to supplement the upper decorative yarn K from the carrier 121 to the fabric.

In the upper stitch sewing machine 100 having the above-described configuration, the main shaft 105 is driven to rotate by the driving of the sewing machine motor, and the needle bar 105 is moved up and down. Then, the rotational drive of the main shaft 106 is converted into a reciprocating rotation operation via the power transmission mechanism 130 and transmitted to the reciprocating rotation shaft 107, and the first and second transmission mechanisms 140 and 150 are further connected to the sewing needles 101 to 101. The carrier 121 and the hook 122 are reciprocally rotated in synchronization with the vertical movement of 104.
Immediately before the needle drop, as shown in FIG. 13, the carrier 121 and the hook 122 move forward, the annular portion 121a of the carrier 121 is on the left side of the left outer needle 101, and the claw portion 121b is on the left outer needle 101 and the left center. Arriving between the needles 102, the hook 122a of the hook 122 reaches the right rear of the right outer needle 104. As a result, the upper decorative yarn K has its upstream portion (yarn supply source side) K1 held on the far side in the feed direction of the left outer needle 101 and the left middle needle 102, and the loop of the downstream portion (fabric side) K2 is a heel portion. It is captured by 122 a and is held on the rear side in the feed direction of the right middle needle 103 and the right outer needle 104 across the left middle needle 102 and the right middle needle 103. In this state, the needle drop is performed, and the upper decoration thread K is sewn.
Further, when the sewing needles 101 to 104 rise and come out of the fabric, as shown in FIG. 14, the carrier 121 and the hook 122 are retracted, and the hook portion 122a of the hook 122 is the downstream portion of the upper decorative yarn K that has been captured. The hook 122 enters the triangular loop K3 newly formed by the upper decorative yarn K between the yarn supply source and the immediately preceding seam as the carrier 121 moves backward from the loop of K2. In the hook 122, the hook portion 122a captures the upper decoration yarn K during the next advance to form the loop shown in FIG. Then, by repeating this, upper decorative stitching is executed (see Non-Patent Document 1).
Published by JUKI Co., Ltd. “Feeding arm type sewing machine“ Flat Seamer ”36200 Series Service Manual” p.30-37, Date of issue: December 2006

By the way, in the above-described upper stitch sewing machine, according to the change of the stitches, the needle clamp 108 and the needle plate (not shown) are exchanged to change and adjust the needle width (needle interval of each sewing needle). At this time, since the needle drop position of each sewing needle is also changed, the tubular portion 121a and the claw portion 121b of the carrier 121 described above may interfere with the sewing needle. Therefore, it is necessary to change the length of the arm of the carrier 121. However, when such adjustment is performed on the carrier 121, the yarn path from the claw portion 121b to the collar portion 122a changes, and the yarn can be captured by the hook 122. Since there is no case, the hook 122 also needs to change the length of the arm.
As described above, the conventional top stitch sewing machine has a problem that the carrier and the hook need to be changed when the needle width is changed.

  In addition, since the carrier 121, the hook 122, and the transmission mechanisms 140 and 150 to the carrier are all assembled on the cloth presser 110 to form a unit, the entire cloth presser 110 is replaced when the needle width is changed and adjusted. The cloth presser 110 needs to be adjusted so as not to cause left / right position adjustment or vertical movement due to its attachment. In particular, it is difficult to adjust the position of the cloth presser 110 so that it does not move up and down and moves smoothly. If this adjustment is insufficient, the movement of the cloth presser 110 will not follow the step of the cloth. Cause sewing failure. Therefore, when changing the needle width, adjustment of the position of the cloth presser 110, which is complicated and requires precision, is required.

Furthermore, when the needle drop position changes due to the needle width change, the swing angles of the carrier 121 and the hook 122 also need to be changed. To change the swing angle of the hook 122, the shaft holding member 133 is replaced, and the center-to-center distance from the center of rotation of the shaft holding member 133 to the center of the spherical bearing 132a is changed. . When exchanging the shaft holding member 133, the cloth holding rod 110 is removed from the cloth holding rod 111, the pressing spring 112 is also removed, the cloth holding rod 111 is removed from the sewing machine frame, and the shaft holding member 133 is moved back and forth with the reciprocating rod 132 and the reciprocating rod. It is performed by removing from the rotating shaft 107 and exchanging with a shaft holding member 133 corresponding to the needle width. Further, after exchanging the shaft holding member 133, the phase adjustment operation between the shaft holding member 133 and the reciprocating rotation shaft 107 is indispensable in order for the reciprocating rotation shaft 107 to operate the carrier 121 and the hook 122 in the correct phase. There was also a problem.
As described above, when changing the needle width, there is a problem that not only the replacement of the needle clamp and the needle plate but also a troublesome work of exchanging and adjusting many other parts occurs.

  An object of the present invention is to facilitate adjustment of a carrier and a hook when changing a needle width.

  The invention described in claim 1 includes a plurality of sewing needles arranged in a direction intersecting with the feed direction of the workpiece and reciprocating up and down, a needle thread passed through the plurality of sewing needles, and an upper decorative seam. A reciprocating sewing machine that holds a decorative thread to be formed and that reciprocally rotates in conjunction with the reciprocating movement of the sewing needle, and that reciprocates and applies reciprocating power to the hook and carrier. A first transmission mechanism that transmits reciprocating power from the reciprocating shaft to the carrier, and a second transmission that transmits reciprocating power from the reciprocating shaft to the hook. A first adjustment mechanism that adjusts the distance from the rotation tip of the carrier to the rotation center, and a second that adjusts the distance from the rotation tip of the hook to the rotation center. And an adjustment mechanism.

Furthermore, the invention according to claim 1 is characterized in that the first adjusting mechanism is provided eccentrically with respect to a rotation shaft serving as a rotation center of the carrier, and has an eccentric shaft portion capable of separating and connecting the carrier. The second adjustment mechanism is provided eccentrically with respect to a rotation shaft serving as a rotation center of the hook, and has an eccentric shaft portion capable of separating and connecting the hook.

The invention according to claim 2 has the same configuration as that of the invention according to claim 1 , and the reciprocating rotation shaft includes a shaft holding member fixed to the reciprocating rotation shaft, and the shaft holding member. A reciprocating power is applied by an arm member extending in the radial direction around the reciprocating rotation shaft and an advancing / retreating member connected to the arm member and provided with a reciprocating motion from a driving source, and between member and the reciprocating member, characterized in that these coupling position is provided a rotation angle adjustment mechanism for adjustable along the radial direction.

The invention according to claim 1 is a first adjustment mechanism for adjusting the distance from the rotation tip of the carrier to the rotation center, and a second adjustment mechanism for adjusting the distance from the rotation tip of the hook to the rotation center. Since the adjustment mechanism is provided, it is possible to eliminate the need to replace the carrier and the hook when changing and adjusting the needle width. As a result, since it is not necessary to replace the cloth presser accompanying the replacement of the carrier and the hook, a complicated work of adjusting the position of the cloth presser can be eliminated.
Therefore, when changing the needle width of the sewing machine, complicated operations such as parts replacement and position adjustment associated therewith are not required, and the needle width can be easily adjusted.

Furthermore, the invention according to claim 1 is that the rotation shaft that pivotally supports the carrier and the hook is connected to each of the carrier and the hook via the eccentric shaft portion that is eccentric with respect to the rotation center. By rotating the rotation shaft, the distance from the rotation end of the carrier and the hook to the rotation center can be adjusted according to the amount of eccentricity. Therefore, the adjustment work of the turning radius of the carrier and the hook accompanying the needle width adjustment can be performed more easily.

The invention according to claim 2 is provided with a rotation angle adjustment mechanism that enables adjustment of the connecting position along the radial direction between the advance / retreat member to which the advance / retreat operation is given from the drive source and the shaft holding member. Therefore, when there is a need to change the swing angle of the carrier and hook due to the change of the needle width, the swing angle can be changed and adjusted only by adjusting the connecting position, and the reciprocating rotary shaft can be powered. It is unnecessary to replace the member of the power transmission mechanism to be applied, and the workability can be improved.

(Overall configuration of the embodiment of the invention)
A top stitch sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the overall configuration of the top stitch sewing machine 10, and FIG. 2 is a perspective view of the main internal configuration. In addition, the same code | symbol is attached | subjected to the structure same as the conventional upper sewing machine 100 mentioned above, and the overlapping description shall be abbreviate | omitted.
As shown in FIGS. 1 and 2, the upper sewing machine 10 includes a needle bar 105, a cloth presser 110, a cloth presser bar 111, a press spring 112, a carrier 121, a hook 122, a main shaft 106, and a reciprocating rotary shaft 107. And a power transmission mechanism 30 that transmits power from the main shaft 106 to the reciprocating rotation shaft 107 and a first transmission mechanism that transmits reciprocating power to the carrier 121 from the reciprocating rotation shaft 107. 40, a second transmission mechanism 50 that transmits reciprocating power from the reciprocating rotation shaft 107 to the hook 122, and a first adjustment that adjusts the distance from the rotation end of the carrier 121 to the rotation center. A mechanism 70 and a second adjustment mechanism 80 that adjusts the distance from the rotation end of the hook 122 to the rotation center are provided, and all of these configurations are held in the sewing machine frame 20.
The upper decorative sewing machine 10 is also a sending-out arm-type decorative sewing machine (flat seamer type), and the cloth, which is the material to be sewn, is fed along the bed portion 21 of the sewing machine frame 20 during the sewing operation. The sewing machine frame 20 is shaped so that the bed portion 21 and the arm portion 23 do not overlap with each other because the operator performs the sewing work from the vertical trunk portion 22 side so that the hand can be easily seen. That is, the bed portion 21 and the arm portion 23 are extended in different directions around the vertical body portion 22 so that the arm portion 23 bends from the middle and the tip portion thereof is directly above the tip portion of the bed portion 21. Designed to.

(Power transmission mechanism)
FIG. 3 is a perspective view of the power transmission mechanism 30, and FIG. 4 is an enlarged perspective view of a main part thereof. The power transmission mechanism 30 that imparts reciprocating rotation to the reciprocating rotation shaft 107 includes an eccentric cam 31 fixedly mounted on the main shaft 106, a cam follower 34 that rotatably holds the eccentric cam 31, and reciprocating rotation. A shaft holding member 33 fixedly mounted on the upper end of the shaft 107, a rotation angle adjusting mechanism 35 for adjusting the reciprocating rotation angle of the reciprocating rotation shaft 107, and a shaft holding member via the rotation angle adjusting mechanism 35. 33 and a reciprocating rod 32 that connects the cam follower 34.

The cam follower 34 rotatably supports the eccentric cam 31, and performs a circular motion by the eccentric cam 31 when the main shaft 106 rotates.
The shaft holding member 33 is fixed to the upper end portion of the reciprocating rotation shaft 107 by screwing.
The reciprocating rod 32 has spherical bearings 32 a at both ends, and the cam follower 34 and the rotation angle adjustment mechanism 35 held by the shaft holding member 33 are connected via these. Since the reciprocating rod 32 has spherical bearings at both ends thereof, only the reciprocating displacement along the longitudinal direction of the rod is transmitted to the side of the shaft holding member 33 even if the cam follower 34 makes a revolving motion. Each spherical bearing is allowed to move in other directions.

The rotation angle adjusting mechanism 35 is formed integrally with the shaft holding member 33 and extends in a substantially radial direction around the reciprocating rotation shaft 107, and a spherical bearing 32a. A screw shaft 37 that connects the other end of the reciprocating rod 32 is provided.
The rotating arm portion 36 is formed with a long hole 36a along the extending direction, and the screw shaft 37 passes through the spherical bearing 32a at the other end of the reciprocating rod 32 and is further inserted into the long hole 36a. Yes. The screw shaft 37 can be arbitrarily adjusted along the elongated hole 36 a by loosening a nut 38 provided at the lower end thereof, and can be fixed at an arbitrary position by fastening the nut 38.
As a result, when the screw shaft 37 is fixed to the inside of the turning radius of the turning arm portion 36, the center-to-center distance from the center of rotation of the shaft holding member 33 to the center of the spherical bearing 32a is shortened. When the reciprocating rotation angle of the reciprocating rotation shaft 107 due to the reciprocating motion can be increased and the screw shaft 37 is fixed to the outer side of the rotation radius of the rotating arm portion 36, the spherical bearing is formed from the rotation center of the shaft holding member 33. Since the center-to-center distance to the center of 32a becomes long, the reciprocating rotational angle of the reciprocating rotational shaft 107 by the reciprocating motion of the reciprocating rod 32 can be reduced. That is, the rotational angle width of the reciprocating rotational shaft 107 can be arbitrarily adjusted by adjusting the position of the screw shaft 37.

FIG. 5 is a perspective view showing the carrier retainer 110, the carrier 121, the hook 122, and the transmission mechanisms 40 and 50 for transmitting operation to them, with the fabric retainer 110 omitted.
The first transmission mechanism 40 includes a rotation arm 141 coupled to the lower end of the reciprocating rotation shaft 107, a transmission link 142 having one end coupled to the rotation end of the rotation arm 141, and the transmission link 142. And a lever shaft 43 having a lever tip connected to the other end thereof.
The lever shaft 43 has a support shaft portion 43a as a rotation shaft that is rotatably supported by the cloth presser 110 in a state where the shaft center is along the vertical direction, and the support shaft with respect to the upper end portion of the support shaft portion 43a. The lever portion 43b that can be attached so as to extend in a direction orthogonal to the portion 43a is configured as a separate member, and the turning radius of the turning tip portion of the carrier 121 is adjusted at the lower end portion of the support shaft portion 43a. The base end portion of the carrier 121 is connected via the first adjusting mechanism 70 that performs the above operation.
With this configuration, the first transmission mechanism 40 constitutes a four-bar linkage mechanism having one node as the reciprocating rotation shaft 107, and the reciprocating rotation is transmitted to the carrier 121 in synchronization with the reciprocating rotation shaft 107. It has a structure.

The second transmission mechanism 50 is configured to use the rotation arm 141 in common with the first transmission mechanism 40, and one end is connected to the rotation arm 141 and the rotation end of the rotation arm 141. The transmission link 152 and the lever shaft 53 having the lever tip connected to the other end of the transmission link 152 are configured.
The lever shaft 53 is supported with respect to the support shaft portion 53a as a rotation shaft that is rotatably supported by the cloth presser 110 in a state where the shaft center is along the vertical direction, and the like with respect to the upper end portion of the support shaft portion 53a. A lever portion 53b that can be attached so as to extend in a direction orthogonal to the shaft portion 53a is formed as a separate member, and the lower end portion of the support shaft portion 53a has a turning radius of the turning tip portion of the hook 122. The base end portion of the hook 122 is connected via a second adjusting mechanism 80 for adjusting.
Similarly to the first transmission mechanism 40, the second transmission mechanism 50 also constitutes a four-bar linkage mechanism in which one node is a reciprocating rotation shaft 107, and the reciprocating rotation is synchronized with the reciprocating rotation shaft 107. Is transmitted to the hook 122.

(First and second adjustment mechanism)
6 is a perspective view of the support shaft portion 43a (53a) of the lever shaft 43 (53) of the first (or second) transmission mechanism 40 (or 50), and FIG. 7 is a first (second) adjustment mechanism 70. It is adjustment operation explanatory drawing by (80).
The first (second) adjustment mechanism 70 (80) is formed at the outer peripheral upper end of the support shaft 43a (53a) of the lever shaft 43 (53) of the first (second) transmission mechanism 40 (50). The first and second flat surface portions 71, 72 (81, 82) and the fastening screw 73 (83) capable of selecting and fixing the relative angle of the lever portion 43b (53b) with respect to the support shaft portion 43a (53a). ), The eccentric shaft portion 74 (84) integrally formed at the lower end portion of the support shaft portion 43a (53a), and the carrier 121 (hook 122) at an arbitrary angle with respect to the eccentric shaft portion 74 (84). A fastening screw 75 (85) that can be fixed is provided.

As shown in FIG. 7, since the eccentric shaft portion 74 (84) is eccentric with respect to the center line of the support shaft portion 43a (53a), the lever portion 43b (53b) centering on the support shaft portion 43a (53a). When the support shaft 43a (53a) is rotated while maintaining the angle between the carrier 121 (hook 122) and the carrier 121 (hook 122), the rotation tip of the carrier 121 (hook 122) connected to the lower end is the center of rotation (support shaft). 43a (53a)) will change.
In the present embodiment, since it is assumed that the needle width is changed to two types, it is necessary that the rotational radius lengths of the carrier 121 and the hook 122 can be switched between two types. Therefore, two flat surface portions 71 and 72 (81 and 82) are provided at the upper end portion of the support shaft portion 43a (53a), and a support shaft portion for the lever portion 43b (53b) is connected to each by a fastening screw 73 (83). The shaft angle of 43a (53a) can be selectively fixed in two types.
As a result, the fastening screw 73 (83) with respect to the flat surface portion 71 (81) is maintained while maintaining the angle formed by the lever portion 43b (53b) and the carrier 121 (hook 122) around the support shaft portion 43a (53a). When the shaft angle is fixed, the turning radius (the distance from the turning center to the turning tip) of the carrier 121 (hook 122) is set to L1, and the fastening screw 73 (83) is set to the flat portion 72 (82). ), The turning radius of the carrier 121 (hook 122) is set to L2.
Further, the upper end surface of the support shaft portion 43a (53a) is processed so as to be rotatable with a tool such as a slit 76 (86) in order to easily switch the shaft angle.
In addition, the position of each plane part 71 and 72 (81, 82) and the amount of eccentricity of the eccentric shaft part 74 (84) can be appropriately set according to the adjustment amount of the needle width. Further, the number of the plane portions is not limited to two, and more planes may be provided, or an angle may be arbitrarily selected with respect to the peripheral surface without providing a plane.

(Explanation of the operation of the upper sewing machine)
Since the sewing operation itself of the upper sewing machine 10 is the same as that of the conventional upper sewing machine 100 described above, the description thereof is omitted.
Here, the setting switching operation of each part executed in accordance with the switching of the needle width will be described.
When the needle width is switched by exchanging the needle clamp 108, first, a pulley (not shown) fixed to the main shaft 106 is rotated to match the phase at which the carrier 121 is at the most advanced position. Furthermore, the rotation radius of the carrier 121 and the hook 122 is adjusted in order to be able to cope with the change in position of the sewing needles 101 to 104 due to the change in the needle width. That is, the fastening screws 73, 83, 75, 85 are loosened while keeping the angle formed by the lever portion 43b (53b) and the carrier 121 (hook 122) with the support shaft portion 43a (53a) as the center, and the tool is moved. The support shafts 43a and 53a are rotated by 180 ° using them. As a result, the respective turning radii of the carrier 121 and the hook 122 are switched. After the switching, the fastening screws 73, 83, 75, 85 are fastened.
Further, the rotation stroke of the carrier 121 and the hook 122 is adjusted by the rotation angle adjustment mechanism 35. That is, the nut 38 of the rotation angle adjustment mechanism 35 is loosened, and the screw shaft 37 is moved along the elongated hole 36 a of the rotation arm portion 36. As a result, the most advanced position, the last retracted position, and the rotation stroke of the carrier 121 and the hook 122 change, so that the screw shaft 37 is aligned at an appropriate position, and the nut 38 is fastened and fixed.
Thereby, adjustment of each part by needle width change is completed.

(Effect of embodiment)
In the upper stitch sewing machine 10 having the above-described configuration, the first adjustment mechanism 70 that can adjust the distance from the turning tip of the carrier 121 to the turning center and the turning tip of the hook 122 to the turning center. Since the second adjustment mechanism 80 that can adjust the distance is provided, it is possible to eliminate the need to replace the carrier 121 and the hook 122 when changing the needle width. As a result, since it is not necessary to replace the cloth presser accompanying the replacement of the carrier 121 and the hook 122, a complicated work of adjusting the position of the cloth presser can be eliminated.
Further, the support shaft portions 43a and 53a that respectively support the carrier 121 and the hook 122 are connected to the carrier 121 and the hook 122 via eccentric shaft portions 74 and 84 that are eccentric with respect to the rotation center thereof. Thus, the rotational radii of the carrier 121 and the hook 122 can be adjusted according to the amount of eccentricity by rotating the support shafts 43a and 53a. Therefore, the adjustment work of the turning radius of the carrier and the hook accompanying the needle width adjustment can be performed more easily.
Therefore, when changing the needle width of the sewing machine, complicated operations such as parts replacement and position adjustment associated therewith are not required, and the needle width can be easily adjusted.

  Further, the upper stitch sewing machine 10 is provided with a rotation angle adjusting mechanism 35 between the connecting rod 32 and the rotating arm portion 36 of the drive transmission mechanism 30 so that the connecting position can be adjusted along the radial direction. Therefore, when it is necessary to change the rotation stroke of the carrier 121 and the hook 122 in accordance with the change in the needle width, the rotation angle can be changed and adjusted only by the fastening operation of the screw shaft 37 and the nut 38. Member replacement work for applying power to the shaft 107 is not required, and workability can be improved.

(Other)
In the upper stitch sewing machine 10, the needle width is changed by exchanging the needle clasp 108. However, the present invention is not particularly limited to this. For example, the sewing needles 101 to 104 are moved and adjusted with respect to the needle clasp. You may take the structure which makes it possible.
Further, the carrier 121 and the hook 122 obtain the power of the rotating operation from the sewing machine motor via the main shaft 106, but may include independent common or individual driving sources.

The first and second adjusting mechanisms 70 and 80 both allow the turning radius of the carrier 121 and the hook 122 to be adjusted using the eccentric shaft portions 74 and 84, but the length of the turning radius is long. It is not particularly limited as long as the height can be adjusted. For example, the carrier 121 (hook 122) can be slidably moved along the direction in which the rotation radius of the carrier 121 (hook 122) is displaced with respect to the support shaft portion 43a (53a), and includes a fixing means for fixing at an arbitrary position. Good.
The same applies to the rotation angle adjustment mechanism 35 that adjusts the reciprocation rotation angle of the reciprocation rotation shaft 107. For example, in the rotation angle adjustment mechanism 35, the rotation radius of the rotation arm portion 36 is adjusted by a sliding operation of the screw shaft 37. However, the rotation radius is not limited to this, and the rotation radius is changed and adjusted by an eccentric cam structure. Also good.

It is a perspective view which shows the whole structure of the top stitch sewing machine which is embodiment of invention. It is a perspective view of the main structures in a sewing machine frame. It is a perspective view of a power transmission mechanism. It is an expansion perspective view of the principal part of a power transmission mechanism. It is the perspective view which showed the carrier, the hook, and those transmission mechanisms. It is a perspective view of the spindle part of the lever shaft of a 1st (2nd) transmission mechanism. It is adjustment operation explanatory drawing by the 1st (2nd) adjustment mechanism, Comprising: (A) shows the case where a turning radius is short, (B) shows the case where a turning radius is long. It is a top view which shows the seam of a top ornament sewing machine. It is a perspective view of the main structures in the conventional sewing machine frame. It is an expansion perspective view which shows the surrounding structure of the conventional cloth presser. It is the perspective view which showed the carrier, the hook, and those conventional transmission mechanisms. It is operation | movement explanatory drawing which shows the holding | maintenance state of the top decoration thread | yarn by a carrier and a hook. It is operation | movement explanatory drawing which shows the holding | maintenance state of the top decoration thread | yarn by a carrier and a hook, Comprising: It shows the most advanced state of a carrier. It is operation | movement explanatory drawing which shows the holding | maintenance thread | yarn holding | maintenance state by a carrier and a hook, Comprising: The last retracted state of a carrier is shown.

Explanation of symbols

10 Top sewing machine 30 Reciprocating transmission mechanism 32 Connecting rod (advancing / retracting member)
35 rotation angle adjustment mechanism 36 rotation arm (arm member)
40 First transmission mechanism 43 Lever shaft 43a Support shaft (rotating shaft)
50 Second transmission mechanism 53 Lever shaft 53a Support shaft (rotating shaft)
70 First adjusting mechanism 74 Eccentric shaft portion 80 Second adjusting mechanism 84 Eccentric shaft portions 101 to 104 Sewing needle 107 Reciprocating rotation shaft 121 Carrier 122 Hook K Top decoration yarn

Claims (2)

A plurality of sewing needles arranged along the direction intersecting the feed direction of the workpiece and reciprocating up and down;
A carrier and a hook that hold a needle thread passed through the plurality of sewing needles and a decorative thread that forms an upper decorative seam, and reciprocally rotate in conjunction with a reciprocating movement of the sewing needle;
In the upper sewing machine with
A reciprocating rotation shaft for applying reciprocating rotational power to the hook and the carrier;
A first transmission mechanism for transmitting reciprocating power to the carrier from the reciprocating rotation shaft;
A second transmission mechanism for transmitting reciprocating power from the reciprocating rotation shaft to the hook;
With
A first adjustment mechanism that adjusts the distance from the rotation tip of the carrier to the rotation center;
A second adjustment mechanism for adjusting the distance from the rotation tip of the hook to the rotation center ,
The first adjustment mechanism is provided eccentrically with respect to a rotation shaft serving as a rotation center of the carrier, and has an eccentric shaft portion capable of separating and connecting the carrier,
The upper sewing machine characterized in that the second adjusting mechanism is provided eccentrically with respect to a rotation shaft serving as a rotation center of the hook, and has an eccentric shaft portion capable of separating and connecting the hook . The reciprocating rotation shaft includes a shaft holding member fixed to the reciprocating rotation shaft, an arm member extending from the shaft holding member in a radial direction around the reciprocating rotation shaft, and the arm member The reciprocating power is applied by an advancing / retreating member that is connected to and advancing / retreating from a drive source,
The upper stitch sewing machine according to claim 1 , further comprising a rotation angle adjusting mechanism between the shaft holding member and the advancing / retracting member so that a connecting position thereof can be adjusted along the radial direction. .

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