CN1904181B - Keyhole Sewing Machine - Google Patents

Abstract

The present invention relates to a keyhole sewing machine, a vertical movement mechanism, a needle cycloidal mechanism and a picking thread mechanism are arranged in the casing, characterized in that a rotary spindle driven by the motor, a countershaft crossed with the spindle, a gear mechanism interlocked with the spindle and the countershaft are provided in the casing.

Description

Keyhole Sewing Machine

technical field

The invention relates to a keyhole sewing machine which is equipped with a needle bar up and down movement mechanism, a needle pendulum mechanism and a thread take-up mechanism in a casing.

Background technique

Conventionally, in buttonhole sewing machines for sewing eyelet buttonhole stitches, a needle bar vertical movement mechanism is driven by a spindle driven by a sewing machine motor to move the needle bar up and down. In addition, the needle swing mechanism is driven by the rotation of the main shaft, and the needle swing mechanism swings the needle bar. And, the thread take-up mechanism is driven by the rotation of the main shaft, and the thread take-up mechanism swings the thread take-up lever.

For example, in the eyelet buttonhole sewing machine described in Japanese Patent Laid-Open No. 313772, the main shaft is arranged in a direction perpendicular to the longitudinal direction of the casing, and the needle bar up and down movement mechanism utilizes the rotational force of the main shaft. Make the needle bar swing arm swing, and the needle bar moves up and down. The eccentric cam fixedly connected with the main shaft makes the swing arm swing, and the needle swing mechanism follows this swing to make the needle bar swing. This round head buttonhole sewing machine is also a structure that utilizes the main shaft to make the needle bar up and down movement mechanism and the needle pendulum mechanism act.

In the aforementioned configuration, since both the needle pendulum mechanism and the needle bar vertical movement mechanism are driven by the main shaft, the action inertia force of both the needle pendulum mechanism and the needle bar vertical movement mechanism has a large effect on the rotation of the main shaft, so that it is difficult for the main shaft to rotate at a high speed. , The needle swing mechanism and the needle bar vertical movement mechanism are also difficult to move at high speed, and there is a problem that the high-speed sewing speed cannot be realized.

Contents of the invention

An object of the present invention is to provide a buttonhole sewing machine capable of realizing high-speed operation of a needle swing mechanism and a needle bar vertical movement mechanism, and increasing the sewing speed.

The keyhole sewing machine of the present invention is equipped with a needle bar up and down movement mechanism, a needle pendulum mechanism and a thread take-up mechanism in the casing, and is characterized in that: a main shaft driven by a sewing machine motor to rotate, and the The main shaft is arranged in a three-dimensional intersection shape, and the gear mechanism is linked to connect the main shaft and the auxiliary shaft.

With this configuration, the sewing machine motor drives the main shaft to rotate, and the main shaft drives the sub shaft to rotate through the gear mechanism. The needle bar up and down movement mechanism, needle swing mechanism and thread take-up mechanism can be separately driven by the main shaft and auxiliary shaft, so that the needle swing mechanism and the needle bar up and down movement mechanism can be operated at high speed, and the sewing speed can be increased.

Description of drawings

Fig. 1 is a perspective view of an electronic eyelet buttonhole sewing machine in an embodiment of the present invention.

Fig. 2 is a side view of the electronic eyelet buttonhole sewing machine in the embodiment of the present invention.

Fig. 3 is a perspective view of the rotating mechanism and the looper mechanism.

Fig. 4 is a perspective view of the internal mechanism of the casing.

Fig. 5 is a side view of the internal mechanism of the casing.

Fig. 6 is a plan view of the internal mechanism of the casing.

Fig. 7 is a front view of the internal mechanism of the casing.

Fig. 8 is a longitudinal sectional side view taken along line VIII-VIII of Fig. 6 .

Fig. 9 is a longitudinal sectional rear view taken along line IX-IX of Fig. 5 .

Fig. 10 is a cross-sectional top view along line X-X in Fig. 5 .

Fig. 11 is an exploded perspective view of the needle pendulum body.

Fig. 12 is a schematic diagram illustrating the needle swinging motion of the needle bar.

Detailed ways

The present invention will be described in more detail below with reference to the accompanying drawings.

As shown in Fig. 1 and Fig. 2, an electronic eyelet buttonhole sewing machine (hereinafter referred to as a buttonhole sewing machine) 1 is carried on a sewing machine table 4, and on a substantially rectangular box-shaped bottom plate 2, a The casing part 3 extending continuously forward.

The upper side of this sewing machine table 4 is provided with an operation panel 5, which is used to indicate various operations such as selective selection from a variety of ball buttonhole stitches. A control device 6 composed of a microcomputer for mechanism operation.

A hollow (tubular) needle bar 8 with a sewing needle 7 mounted on the lower end thereof is provided at the front end portion of the housing portion 3, and the needle bar 8 can move up and down by a needle bar vertical movement mechanism 36 described later. The needle bar 8 can swing between a left swing position (inner needle position) and a right swing position (outer needle position) by a needle swing mechanism 60 (shown in FIG. 4 ), which will be described later, by a predetermined width.

As shown in FIG. 3 , a sewing machine motor (not shown) and a looper stand 11 are provided inside the bottom plate portion 2 . The sewing machine motor is a driving source for vertical motion and swing of the needle bar 8 and for synchronously driving the sewing mechanism such as the looper mechanism 10 . A looper mechanism 10 having a pair of left and right loopers (not shown) facing the needle bar 8 is attached to the looper base 11, and the looper base 11 is integrally rotatable around a vertical axis by a rotation mechanism 15 described later. .

The upper thread supplied from the thread supply source passes through the sewing needle 7, the lower thread passes through the front end of the left looper, and the right looper twists with the lower thread while weaving the upper thread loop to form a thread loop. combination.

The rotation mechanism 15 is composed of a θ-direction drive motor 21 and a gear mechanism provided in the bottom plate portion 2, and the needle bar 8 and the looper holder 11 are respectively integrally rotated on a horizontal plane around a vertical axis by the rotation mechanism 15. The rotation mechanism 15 will be briefly described with reference to FIG. 3 .

An upper pulley 17 is fixed to the upper end of the vertical rotating shaft 16 , and a lower pulley 18 is fixed to the lower end of the rotating shaft 16 . The timing belt 20 is stretched on the upper side pulley 17 and the needle bar rotating bracket 80 fitted with the needle bar 8 . A timing belt 24 is stretched on the lower pulley 18 , the drive pulley 22 affixed to the drive shaft of the θ direction drive motor 21 and the driven gear 23 of the looper seat 11 .

Due to the rotation of the driving motor 21 in the θ direction, the needle bar 8 and the looper seat 11 can be synchronously rotated around the vertical axis through the rotating shaft 16 and the timing belts 20 and 24 .

The rotating mechanism 15 includes a needle bar rotating mechanism 15A and a looper base rotating mechanism 15B. The needle bar rotating mechanism 15A is composed of the needle bar rotating bracket 80, the synchronous belt 20, the upper side pulley 17 fixedly connected with the rotating shaft 16, the synchronous belt 24, the θ direction driving motor 21, etc., and the needle bar can be driven by the θ direction driving motor 21. 8 rotate around its axis.

The looper base rotating mechanism 15B is composed of the driven gear 23 of the looper base 11, the timing belt 24, the θ direction driving motor 21, etc., and the rotation of the looper base 11 and the needle bar 8 are synchronized by the θ direction driving motor 21.

As shown in FIG. 2 , in the bottom plate portion 2 , the cutter 25 is detachably mounted on a mount (not shown) on the rear side of the looper holder 11 via a stud. The cutter 25 is a member for forming a round hole. A hammer 26 that can swing up and down is provided inside the casing 3 , and approaches and separates from the cutter 25 from above.

A detachable hammer body 27 is attached to the front end of the hammer 26 . The hammer 26 is driven by a hammer driving mechanism (not shown) formed of an air cylinder or the like provided in the bottom plate portion 2 . Through the interaction between the hammer body 27 and the cutter 25, the processing cloth is perforated to form a round head hole consisting of a substantially circular round head and a continuous linear tail.

As shown in FIGS. 1 and 2 , a feed table 28 is provided on the upper surface of the bottom plate portion 2 . The processing cloth that needs to carry out buttonhole sewing is carried on the feeding table 28 . The feeding platform 28 is in the shape of a thin rectangular box as a whole, and is open toward the position of the looper seat 11 and the cutter 25 . On the upper surface of this feed table 28, although not shown in figure, a pair of left and right cloth clamps made of metal are provided.

In the bottom plate part 2, there is provided with: an X-direction moving mechanism (not shown) that makes the feeding table 28 move along the X direction (left-right direction) by driving an X-direction drive motor (not shown) composed of a stepping motor. , and the Y direction moving mechanism (not shown) that makes this feeding table 28 move along the Y direction (front and back direction) by the drive of the Y direction drive motor (not shown) that is made up of stepping motor.

As shown in FIGS. 4 and 6 , in the casing 3 , the main shaft 30 is arranged in the front-rear direction, and is rotatably supported by the machine frame F at a plurality of locations. A sub-shaft 31 in the left-right direction is arranged on the substantially central portion in the front-back direction of the casing 3 just below the main shaft 30 . The sub-shaft 31 is formed in a shape perpendicular to the main shaft 30 in plan view, that is, in a form intersecting the main shaft 30 three-dimensionally. Both ends of the sub-shaft 31 are rotatably supported by the machine frame F. As shown in FIG.

As shown in FIGS. 1 , 2 , and 6 , a pulley-shaped operating portion 12 is fixed to the right end portion of the counter shaft 31 . The operation unit 12 is located at a position easily accessible by the operator's hand, protrudes outward from the machine frame F on the right side of the casing unit 3, and is fixed so that the operator can manually operate it. A pulley 32 is fixed to the rear end of the main shaft 30 . A timing belt 33 is stretched on the pulley 32 and the drive pulley (not shown) affixed to the motor shaft of the sewing machine motor. The main shaft 30 is driven to rotate by the sewing machine motor through a timing belt 33 .

As shown in FIG. 6 , a hypoid gear 34 is fixed on the main shaft 30 , and a hypoid gear 35 meshing with the hypoid gear 34 is fixed on the secondary shaft 31 . In this case, the number of teeth of the eccentric bevel gear 35 of the counter shaft 31 is twice the number of teeth of the eccentric bevel gear 34 of the main shaft 30 . Therefore, the rotational speed of the secondary shaft 31 is 1/2 of the rotational speed of the main shaft 30 . The two eccentric bevel gears 34 and 35 constitute a gear mechanism 95 as a reduction gear mechanism.

The thread take-up mechanism 90 will be described. As shown in FIGS. 4 to 6 , a circular cam plate 91 is fixed on the inner side of the operation portion 12 at the right end of the secondary shaft 31 . On the left side of the cam plate 91, a grooved cam 91a is formed. A support shaft 92 parallel to the subshaft 31 is arranged on the front side of the subshaft 31 . The lower end of the thread take-up forming member 93 is fixed to the right end of the support shaft 92 .

A roller 94 is rotatably supported at one end of the thread take-up forming member 93 . The roller 94 is fitted in the grooved cam 91a. A thread take-up lever 93 a is formed on an upper end portion of the thread take-up lever forming member 93 . When the sewing machine motor rotates the main shaft 30, the auxiliary shaft 31 rotates at 1/2 the rotation speed of the main shaft 30 through a pair of off-axis bevel gears 34 and 35, and the thread take-up lever 93a swings through the roller 94 under the rotation of the cam plate 91. .

Next, the needle bar vertical movement mechanism 36 for driving the needle bar 8 up and down by the main shaft 30 arranged in the front-rear direction in the housing portion 3 will be described.

As shown in FIGS. 4 to 6 , a spindle crank 37 is fixed to the front end portion of the spindle 30 . The spindle crank 37 is connected to a needle bar vertical movement mechanism 36 that moves the needle bar 8 up and down. The needle bar up and down movement mechanism 36 has a needle bar crank 38 and an up and down movement transmission mechanism 40 . The upper end of the needle bar crank 38 is rotatably supported on the eccentric portion of the main shaft crank 37 , and the vertical movement transmission mechanism 40 is interlockingly connected to the needle bar crank 38 .

As shown in FIGS. 4 to 6, the needle bar crank 38 is composed of a crank body portion 38a and an L-shaped extension crank portion 38b integrally extending forward from the crank body portion 38a. The front end portion of the portion 38b, that is, the extended support portion 38c is formed parallel to the crank body portion 38a at a predetermined distance in the left-right direction.

The up and down movement transmission mechanism 40 will be described. As shown in FIGS. 4 to 10 , the vertical movement transmission mechanism 40 has: a yoke member 41, an annular member 43, guide blocks 45, 46, a guide mechanism 50, an upper pad member 51a and a lower pad member 51b, The upper needle bar holder 52, the lower needle bar holder 53, and the like. The needle bar crank 38 rotatably supports the yoke member 41 via a rear first spindle 42 a and a front first spindle 42 b as first spindles. The yoke member 41 supports the annular member 43 via a left second spindle 44a and a right second spindle 44b as second spindles.

The guide mechanism 50 has a rear block guide plate 47, a front block guide plate 48, and the like.

Between the needle bar crank 38 and the main shaft crank 37, a plate-shaped rear block guide plate 47 in the left and right directions is arranged, and is fixedly connected to the machine frame F. As shown in FIG. A plate-shaped front block guide plate 48 in the left-right direction is arranged on the front side of the extended support portion 38c of the needle bar crank 38, and is fixedly connected to the rear block guide plate 47 by a plurality of connecting shafts 54,55. The rear block guide plate 47 and the front block guide plate 48 face each other in parallel.

A linear guide groove 47a extending longitudinally is formed at the central portion in the lateral width direction on the front side of the rear block guide plate 47, and a linear guide groove 47a extending longitudinally is formed at the central portion in the lateral width direction on the rear surface of the front block guide plate 48. 48a. The guide block 45 is engaged with the guide groove 47a of the rear side block guide plate 47 so that it can move up and down. The guide block 46 is engaged with the guide groove 48a of the front side block guide plate 48 so that it can move up and down. The yoke member 41 is disposed between the rear block guide plate 47 and the front block guide plate 48 .

In the rear side support part 41a of the yoke member 41, the substantially front half part of the rear side 1st spindle 42a which passes through the crank main body part 38a is fitted, and the rear end part of this rear side 1st spindle 42a is rotatably supported. On the guide block 45. The rear first spindle 42a is fixed to the crank main body portion 38a by a fixing pin 56 .

In the front side support part 41b of the yoke member 41, the substantially rear half part of the front side 1st support shaft 42b which penetrates the extension support part 38c is fitted, and the front-end part of this front side 1st support shaft 42b is rotatable. It is supported on the guide block 46 . The front first support shaft 42b is fixed to the extension support portion 38c by a fixing pin 57 .

The rear block guide plate 47 and the front block guide plate 48 support the yoke member 41 freely up and down by the engagement of the front and rear pair of guide blocks 45, 46 with the guide grooves 47a, 48a. The annular member 43 has a substantially annular shape in plan view, and is disposed inside the yoke member 41 .

As shown in FIG. 10 , the annular member 43 has a larger diameter than the needle bar 8 , that is, a clearance S for swinging of the needle bar 8 is provided. A left side support portion 43 a and a right side support portion 43 b protruding in the left and right directions are respectively formed on the annular member 43 . The left side supporting shaft 44a is rotatably supported on the left side support portion 43a of the annular member 43, and the left end portion of the left side second supporting shaft 44a is fitted into the left side support of the yoke member 41. part 41c.

The right side support portion 43b of the annular member 43 is rotatably supported by the substantially left half of the right second support shaft 44b, and the right end portion of the right second support shaft 44b is fitted into the right side support of the yoke member 41. part 41d. The rear first spindle 42a and the front first spindle 42b are perpendicular to the left second spindle 44a and the right second spindle 44b.

The rear first support shaft 42a, front first support shaft 42b, left second support shaft 44a, and right second support shaft 44b support the ring member 43 on the needle bar crank 38 in the form of a universal joint. . The annular member 43 is rotatable about the axes of the first rear shaft 42a and the first front shaft 42b, and is rotatable about the axes of the second left shaft 44a and the second right shaft 44b.

As shown in Figures 4 to 5, Figures 8 to 9, and Figure 12, a thin plate-shaped circular support plate 9 made of elastic material is fixed on the machine frame F, and the support plate 9 supports the vertical movement and can swing. (Swing center P is shown in FIG. 12) near the upper end of the needle bar 8. The needle bar 8 extends downward through the inside of the ring member 43 , and faces the lower side of the housing portion 3 via a needle pendulum mechanism 60 described later.

The upper side packing member 51a is circular, and a hole having the same external dimensions as the needle bar 8 is provided in the central portion. The upper pad member 51 a is slidably arranged on the upper side of the ring member 43 , and the circular lower pad member 51 b is slidably arranged on the lower side of the ring member 43 . The middle part of the needle bar 8 is inserted into these upper side packing member 51a and the lower side packing member 51b.

The upper needle bar holder 52 is fixedly connected to the needle bar 8 in such a manner that it is arranged to be in contact with the upper surface of the upper backing member 51 a. The lower needle bar holder 53 is fixedly connected to the needle bar 8 in such a manner that it is arranged to be in contact with the lower surface of the lower backing member 51b.

When the drive spindle 30 rotates and the crank body portion 38a and the extension support portion 38c of the needle bar crank 38 are moved up and down by the spindle crank 37, the rear first support shaft 42a and the front first support shaft 42b, as well as the front and rear first support shafts, The engagement of the guide blocks 45 and 46 with the guide grooves 47a and 48a moves the yoke member 41 up and down. Thereby, the annular member 43 moves up and down by the second left shaft 44 a and the second right shaft 44 b, and the needle bar 8 moves up and down by the upper needle bar holder 52 and the lower needle bar holder 53 .

At this time, when the needle bar 8 is moved up and down while swinging forward, backward, left, and right by the needle pendulum mechanism 60 described later, since the upper pad member 51a and the lower pad member 51b can slide relative to the ring member 43, the needle bar 8 It can swing back and forth, left and right without any obstacles. When the needle bar 8 swings, even if the upper side needle bar frame 52, the lower side needle bar frame 53, the upper side spacer member 51a, and the lower side spacer member 51b fixed on the needle bar 8 change from a horizontal posture to an inclined posture, Also because the annular member 43 is supported on the needle bar crank 38 in the form of the above-mentioned universal joint, it can reliably absorb the inclination of the upper side pad member 51a and the lower side pad member 51b, and the needle bar 8 can move up and down and swing.

The pendulum mechanism 60 will be described. As shown in FIGS. 4 to 6 , the pendulum mechanism 60 is composed of a pendulum drive unit 61 and a pendulum main body 62 . First, the pendulum driving unit 61 will be described.

A dichotomous portion 68 a of the swing member 68 is engaged with an eccentric cam plate (not shown) fixed to the subshaft 31 . The lower end portion of the swing member 68 is rotatably supported by a support shaft 69 fixed to the machine frame F. As shown in FIG.

One of the bifurcated portions 68 a of the swing member 68 is connected to the rear end portion of the connecting rod 70 . A swing adjusting plate 72 is swingably supported by a support shaft 71 mounted on the machine frame F in the left-right direction. The front end portion of the connecting rod 70 is connected to the curved cutout hole 72b of the first crank portion 72a of the swing adjusting plate 72 via a stud (not shown) and a nut 73 . The second crank portion 72 c of the swing adjusting plate 72 is connected to the base end portion of the needle swing yoke 74 .

Loosen the nut 73, when the installation position of the front end of the connecting rod 70 in the notch hole 72b is close to the support shaft 71 side of the swing adjustment plate 72, the swing amount of the second crank part 72c becomes larger, and the needle swing of the needle bar 8 can be increased. quantity. When the installation position of the front end of the connecting rod 70 in the notch hole 72b is close to the side of the swing adjustment plate 72 opposite to the support shaft 71, the swing amount of the second crank part 72c becomes smaller, and the needle swing of the needle bar 8 can be reduced. quantity.

The pendulum body portion 62 will be described. As shown in FIG. 11 , the circular needle bar rotating bracket 80 is embedded in a large-diameter through hole (not shown) formed on the front bottom of the housing part 3 , and can rotate but will not come out. The needle bar rotating bracket 80 is basically a hollow cylinder, and integrally has: a cylindrical portion 80a inserted into the through hole, a pulley 80b provided at the lower portion of the cylindrical portion 80a, and a pair of facing shafts hanging from the pulley 80b. Foot 80c.

80 d of horizontal accommodation holes are respectively formed in a pair of leg part 80c. A cylindrical needle bar guide member 81 is housed in the cylindrical portion 80 a of the needle bar rotating bracket 80 so as to be movable up and down. The needle bar guide member 81 is composed of a cylindrical member 82 on the longitudinal side and a cuboid block portion 83 fixed to the lower end of the cylindrical member 82 .

In the assembled state of the needle bar rotation bracket 80 and the needle bar guide member 81, the cylindrical member 82 is inserted into the cylindrical portion 80a of the needle bar rotation bracket 80, and the block portion 83 is located between the pair of leg portions 80c.

Two oblique grooves 83a extending in the same direction are respectively formed on the two surfaces of the side surfaces of the block portion 83 connected to the leg portion 80c. A guide pin 84 is slidably accommodated in the accommodation hole 80d of each leg portion 80c. A pendulum protrusion 84 a slidably engaged with the oblique groove 83 a protrudes from the front end portion of the guide pin 84 . Bottomed holes 84 b in the axial direction are respectively formed at the other ends of the guide pins 84 , and elastic compression springs 85 are accommodated in the bottomed holes 84 b.

The pressing plate 86 is substantially U-shaped, and the pressing plate 86 is used to clamp the leg portion 80c. The opposing tongue piece 86a on the pressure plate 86 closes the storage hole 80d. As a result, the compression spring 85 biases the guide pin 84 housed in the housing hole 80 d inwardly so that the pendulum protrusion 84 a faces the oblique groove 83 a of the block portion 83 slidably. The guide pin 84 is fixed to the case part 3 by the pressure plate 86 .

A needle bar guide member 81 is inserted into a connecting ring 87 described later. A rotatable connecting ring 87 is clamped by a flange portion 88 provided in the circumferential direction of the cylindrical member 82 and a fixing ring 89 inserted from above. The connecting ring 87 has connecting pins 87 a extending in the horizontal direction, and these connecting pins 87 a are connected to the bifurcated connecting portion 74 a of the needle swing yoke 74 .

When the needle bar guide member 81 moves up and down through the needle swing yoke 74 and the connecting ring 87 by the above-mentioned needle swing driving part 61, the block part 83 also moves up and down integrally. At this time, the guide pin 84, which is fixed on the housing portion 3 by the pressing plate 86, faces the oblique groove 83a of the block portion 83 with its needle pendulum protrusion 84a, so that the block portion 83 (and the needle bar guide The member 81) swings left and right along its oblique groove 83a.

Between the inner peripheral surface of the connecting ring 87 and the outer peripheral surface of the needle bar guide member 81 , an annular gap that allows the needle bar guide member 81 to move slightly relative to the connecting ring 87 is formed. That is, the needle bar guide member 81 can move slightly in the front, rear, left, and right directions relative to the connecting ring 87 when the needle swings due to the existence of the annular gap.

Next, the operation and effects of the buttonhole sewing machine 1 will be described.

During sewing, the sewing machine motor is driven to rotate, the main shaft 30 is driven by the timing belt 33 and the pulley 32, and the auxiliary shaft 31 is rotated by the eccentric bevel gears 34,35. Through the rotation of the main shaft 30, the needle bar 8 is moved up and down by the needle bar up and down movement mechanism 36 as described above.

When the main shaft 30 rotates, the auxiliary shaft 31 also rotates, and the thread take-up lever 93a of the thread take-up mechanism 90 connected to the right end of the auxiliary shaft 31 swings, and at the same time, the needle swing connected to the left end of the auxiliary shaft 31 is used to swing. The mechanism 60 swings the needle bar 8 . The operator manually operates the operation unit 12 when preparing the processed cloth for sewing or taking out the processed cloth after sewing.

Like this, in the buttonhole sewing machine 1 that needle bar up and down motion mechanism 36, needle pendulum mechanism 60 and thread take-up mechanism 90 are installed in the casing part 3, the main shaft 30 driven to rotate by the sewing machine motor is arranged in the casing part 3, and The sub-shaft 31 arranged in a three-dimensional intersection with the main shaft 30 is interlockingly connected to the main shaft 30 and the sub-shaft 31 by a gear mechanism 95 composed of off-axis bevel gears 34 and 35 . Thus, while the sewing machine motor drives the main shaft 30 to rotate, the main shaft 30 drives the secondary shaft 31 to rotate through the gear mechanism 95 . The simultaneously rotating main shaft 30 and auxiliary shaft 31 can be used to separately drive the needle bar up and down movement mechanism 36, the needle pendulum mechanism 60 and the thread take-up mechanism 90, so that the high-speed action of the needle pendulum mechanism 60 and the needle bar up and down movement mechanism 36 can be realized. The sewing speed is increased.

Moreover, because the main shaft 30 is linked with the needle bar up and down movement mechanism 36, and the auxiliary shaft 31 is linked with the needle pendulum mechanism 60 and the thread take-up mechanism 90, so the needle bar up and down movement mechanism 36 can be driven by the main shaft 30 at a high speed. Higher sewing speed can be realized. The needle pendulum mechanism 60 and the thread take-up mechanism 90 can be respectively driven by the secondary shaft 31 in conjunction with the needle bar up and down movement mechanism 36 .

Because the needle pendulum mechanism 60 and the thread take-up mechanism 90 are separately connected to the two ends of the auxiliary shaft 31 in an interlocking manner, the degree of freedom of arrangement of the needle pendulum mechanism 60 and the thread take-up mechanism 90 can be improved, and the degree of freedom of the auxiliary shaft 31 can be improved. driving force transmission and balance.

Because the end portion of the auxiliary shaft 31 is fixed with an externally manually operable operating unit 12, the installation position of the operating unit 12 is close to the operator, which can improve the operability of the operator on the operating unit 12 and improve work efficiency.

Because the gear mechanism 95 has a group of off-axis bevel gears 34, 35, it is possible to make the main shaft 30 and the auxiliary shaft 31 rotate in the form of three-dimensional intersection in the middle part, respectively, and the respective two ends of the main shaft 30 and the auxiliary shaft 31 can be rotated. Supported on the machine frame F respectively, the stability when the main shaft 30 and the auxiliary shaft 31 rotate at high speed can be improved. That is, when a group of bevel gears with two shafts perpendicular to each other on the horizontal plane are used as a gear mechanism, since one bevel gear is installed on the front end of the main shaft and the other bevel gear is installed on the front end of the auxiliary shaft, although the main shaft and the auxiliary shaft are not connected at both ends. However, in this embodiment, because there is a set of off-axis bevel gears 34, 35, the rotation transmission of the main shaft 30 and the auxiliary shaft 31 can be carried out in the form of three-dimensional intersection in the middle part, and the main shaft 30 and the auxiliary shaft can be connected to each other. 31 are respectively supported on the machine frame F at both ends thereof.

Since the gear mechanism 95 is composed of a reduction gear mechanism that sets the rotational speed of the countershaft 31 to 1/2 of the rotational speed of the main shaft 30, the needle pendulum mechanism 60, the thread take-up mechanism 90, and the needle bar 8 can be moved up and down twice. Movements perform actions synchronously.

Modifications in which partial modifications are made to the foregoing embodiments will be described below.

1) The auxiliary shaft 31 can also form a three-dimensional intersection directly above the main shaft 30 through a pair of off-axis bevel gears 34 and 35 .

2) It is also possible to fix the worm gear on the main shaft 30, and fix the worm gear on the auxiliary shaft 31. The gear mechanism 95 is composed of the worm gear and the worm gear meshed with it.

3) It is also possible to connect the needle pendulum mechanism 60 with the right side of the auxiliary shaft 31 in interlocking manner, and connect the thread take-up mechanism 90 with the left side of the auxiliary shaft 31 in interlocking manner.

4) The situation that the present invention is applied to the electronic round head buttonhole sewing machine 1 has been described above, but the present invention can be applied to the lockstitch sewing machine having the needle bar up and down movement mechanism 36, the needle pendulum mechanism 60 and the thread take-up mechanism 90 And so on various keyhole sewing machines.

Claims (6)

1. A keyhole sewing machine, a needle bar up and down movement mechanism, a needle pendulum mechanism and a thread take-up mechanism are installed in the casing part, it is characterized in that, Inside the casing part are provided: a main shaft driven to rotate by the sewing machine motor, a sub-shaft intersecting with the main shaft, and a gear mechanism connecting the main shaft and the sub-shaft in interlocking manner, The main shaft is connected in linkage with the needle bar up and down movement mechanism, and the auxiliary shaft is connected in linkage with the needle pendulum mechanism and the thread take-up mechanism. 2 . The buttonhole sewing machine according to claim 1 , wherein the sub-shaft is disposed below the main shaft to form the three-dimensional cross shape. 3 . 3 . The buttonhole sewing machine according to claim 2 , wherein the needle swing mechanism and the thread take-up mechanism are separately and interlockingly connected to both ends of the auxiliary shaft. 4 . 4. The buttonhole sewing machine according to any one of claims 1 to 3, wherein an operation portion that can be manually operated from the outside is fixed to an end portion of the auxiliary shaft. 5. The buttonhole sewing machine according to any one of claims 1 to 3, wherein the gear mechanism has a set of off-axis bevel gears. 6. The buttonhole sewing machine according to claim 1, wherein the gear mechanism is a reduction gear mechanism in which the rotation speed of the sub shaft is set to 1/2 of the rotation speed of the main shaft.

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