KR20100090546A - Apparatus heads up down of sewing machine - Google Patents

Abstract

PURPOSE: An apparatus heads up down of a sewing machine is provided to control the position of the apparatus heads by improving an up/down apparatus. CONSTITUTION: An apparatus heads up down of a sewing machine is comprised of an elevating plate(10), a driving box(20), a position fixing pin(31), a slide(30), cam, and a gear motor. The driving box includes a slide groove(21) and a cam groove(22). The position fixing pin installed in the slide groove is movable and is inserted into a fixing groove.

Description

Head Up Down Device of Sewing Machine {APPARATUS HEADS UP DOWN OF SEWING MACHINE}

The present invention relates to an up-down apparatus installed in a sewing machine such as a quilting machine (quilting machine), a embroidery machine, a sewing machine, and the like to automatically lift and move the head during sewing work or fabric input and withdrawal of the fabric. It is related to the head up-down device of the sewing machine which can raise and lower, the head accurately preserves its position (up-down position), prevent noise and fabric contamination, reduce the cost, and raise and lower the head manually.

In general, sewing machines, such as quilting machine (quilting machine), embroidery machine, sewing machine, and the like to sew a variety of patterns on the fabric, such sewing machine in the base that is installed to move left and right on the feed shaft, and through the bracket on the base The head is provided to be movable up and down, and the head for supporting the needle to sew a pattern is moved up and down, and an up-down device for elevating the head up and down is provided.

In this way, the head up-down device of the sewing machine is to elevate the head, and this up-down device is installed on one side of the head, and during sewing work, the head is lowered to sew a pattern on the fabric while the needle moves up and down, and the sewing work is performed. When finished, remove the fabric or insert a new fabric, the head is raised during the input and withdrawal of the fabric.

However, since the conventional up-down device is configured to raise or lower the head by the air cylinder, the air piping for supplying air to the air cylinder is structurally complicated, and an expensive compressor is required, resulting in a large cost increase. There was a problem, and a separate space is required for installing the compressor, so there was a difficult problem in securing the space.

In addition, in the conventional up-down device, the head falls to its own weight when the air supply is insufficient or not accurate. Therefore, the head cannot be lifted accurately and smoothly structurally, and the magnetic position of the head cannot be precisely preserved. There was a problem.

In addition, since the conventional up-down device uses an air cylinder, there is a problem that a large amount of air draining noise occurs when the air cylinder is operated, and there is a problem of oil leaking from the air cylinder to contaminate the fabric, and in particular, the air cylinder is manually If the air supply is not made due to failure of the compressor or the air pipe due to the failure of the operation, there was a structural problem that the head cannot be up and down.

An object of the present invention is to invent the above-mentioned conventional drawbacks, and to improve the mechanical mechanism up and down to accurately and smoothly lift the head automatically, and also prevent the head from falling It is to provide the head up-down device of the sewing machine to ensure the accurate preservation of the magnetic position at all times, and to prevent the occurrence of noise and fabric contamination in advance and to reduce the cost.

Another object of the present invention is to provide a head up-down apparatus of a sewing machine, which can raise and lower the head manually as needed.

In order to achieve the above object, the present invention is a sewing machine provided with a base that is movable to the left and right on the feed shaft, and the head is installed to the base through a bracket to support the needle to move up and down, A mounting plate having a multi-stage fixing, driving groove and connecting passage is installed on one side of the bracket, and a drive box having a slide groove and a cam groove is installed on one side of the base, and the slide groove is fitted into the fixed groove. Mounting a slide having a fixed pin and a vertical guide hole formed to be movable back and forth, and rotatably mounted a cam with an eccentric drive pin is inserted into the cam groove as a guide hole, a driving groove to operate the slide and the lifting plate. And a geared motor for driving the cam in forward and reverse directions.

According to the up-down device of the present invention, since the head is raised and lowered mechanically without using air pressure, the head can be lifted accurately and smoothly structurally, and the head is always at the magnetic position because the head is prevented from falling. It can keep precisely, and it is mechanically lifted and operated smoothly, so there is no noise, and since oil is not discharged, it is possible to prevent fabric contamination caused by oil in advance. Since it is not used, the cost can be reduced, and the head can be raised and lowered manually if necessary.

Hereinafter, the technical configuration of the present invention according to the accompanying drawings in detail.

The head up-down device of the sewing machine of the present invention is lifted up and down through the bracket 3 to the base 2 and the base 2, which are movably installed from side to side on the feed shaft 1, as shown in FIGS. 1A to 9I. In a sewing machine provided with a head (5) capable of being installed to support the needle (4) to move up and down, it is installed on one side of the bracket (3), multi-stage fixed, drive grooves (11) (12) and connection A lifting plate 10 having a passage 13; A drive box 20 installed at one side of the base 2 and having a slide groove 21 and a cam groove 22; A slide (30) having a position fixing pin (31) fitted to the slide groove (21) and movable in the slide groove (21) and fitted into the fixing groove (11) and a guide hole (32) formed vertically; The cam 40 is rotatably mounted to the cam groove 22 and has an eccentric drive pin 41 inserted into the guide slot 32 and the driving groove 11 to operate the slide 30 and the elevating plate 10. ); A geared motor 50 for driving the cam 40 forward and backward; It comprises a sensor (S1) (S2) (S3) for sensing the operating state of the elevating plate 10, the slide 30 and the geared motor 50 is a basic feature of the technical configuration.

Here, the sewing machine is to sew a variety of patterns on the fabric as is known, such a sewing machine in the base (2) which is installed to move left and right on the feed shaft (1), as shown in Figure 1a, 1b and A head 5 is provided on the base 2 so as to be movable up and down through the bracket 3 to support the needle 4 for sewing the pattern up and down. At this time, the lifting plate 10 according to the present invention is fixed to one side of the bracket (3) through a plurality of bolted fastening, as shown in Figure 4, the drive box 20 according to the present invention on one side of the base (2) ) Is fixed through a number of bolts.

According to the present invention, during sewing operation, the head 5 is automatically lowered (down) as shown in FIG. 1A so that the needle 4 can sew a pattern on the fabric while moving up and down, and the fabric is removed after the sewing operation is completed. In the case of adding or removing the fabric, such as when putting a new fabric or a new fabric, the head 5 is automatically raised (up) as shown in FIG. 1B. At this time, according to the present invention, it is clear that the head 5 can be raised (up and down) manually as well as automatically if necessary.

The lifting plate 10 is fixed to the bracket (3) through a plurality of bolts as shown in Figure 4 to lift the head (5), the front of the lifting plate 10 in multiple stages as shown in FIG. The fixing groove 11 is formed, the driving groove 12 is formed in multiple stages in the rear center portion of the elevating plate 10, and the connecting passage 13 is formed between the fixing groove 11 and the driving groove 12. . At this time, as shown in FIGS. 1A and 1B, when the lifting plate 10 moves up and down, the bracket 3, the needle 4, and the head 5 move up and down simultaneously.

According to the exemplary embodiment of the present invention, as shown in FIG. 7, four fixing grooves 11 of the elevating plate 10 are formed in four stages, and two driving grooves 12 are formed in two stages. Upper and lower portions of the connection passage 13 are formed with stoppers 14 and 15 for intermittently driving the driving pins 41. At this time, the position fixing pin 31 of the slide 30 is inserted into the fixing groove 11 during the lifting operation in sequence, and the driving pin 41 of the cam 40 during the lifting operation is inserted into the driving groove 12. Inserted in sequence, the connecting passage 13 guides the lift to position any one of the position fixing pin 31 or the driving pin 41 during the lifting operation, the stopper 14, 15 during the lifting operation The driving of the driving pin 41 is interrupted at the top dead center and the bottom dead center.

The drive box 20 is fixed to the base 2 as shown in Figure 4 by fastening a plurality of bolts, the upper portion of the drive box 20, as shown in Figure 7 a slide groove 21 is formed, The cam groove 22 is formed in the center of the slide groove 21. In this case, the slide 30 is mounted on the slide groove 21 so as to be movable back and forth, and the cam 40 is mounted on the same axis so as to be rotatable.

According to the exemplary embodiment of the present invention, as shown in FIGS. 7 and 8, the drive gear 60 driving integrally with the cam 40 is mounted on the same axis along the cam groove 22 of the drive box 20. A gear groove 23 is provided below the cam groove 22, and a manual gear 70 meshed with the drive gear 60 is rotatably mounted to the gear groove 23 by a bearing, and the manual gear ( The manual handle 80 is connected to 70. Therefore, according to the present invention, the cam 40 can be driven manually by using the manual handle 80.

According to the exemplary embodiment of the present invention, as shown in FIGS. 7 and 8, female threads 24 communicating with the slide grooves 21 are vertically formed on both upper sides of the driving box 20, respectively, and the female screws 24 are provided. There is a clearance prevention ball plunger bolt 90 to prevent the clearance of the slide 30 is installed by screwing each.

The slide 30 is mounted to the slide groove 21 of the drive box 20 to move back and forth to prevent the falling of the elevating plate 10, the center portion of the slide 30 as shown in FIG. Position fixing pins 31 fitted into the fixing grooves 11 of the steel plate 10 protrude, and the guide hole 32 fitted into the driving pins 41 of the cam 40 is perpendicular to the rear of the slide 30. Is formed. At this time, the slide 30 serves to accurately hold the magnetic position of the lifting plate 10 during the lifting operation.

According to the exemplary embodiment of the present invention, as shown in FIG. 7, the position fixing pins 31 of the slide 30 are provided in a pair of upper and lower parts.

According to the exemplary embodiment of the present invention, as shown in FIGS. 7 and 8, oil-using guide grooves 33 and 34 are formed on the upper and lower surfaces of the slide 30 in the longitudinal direction, respectively, and the guide grooves 33 are driven. Balls provided in the lower portion of the clearance prevention ball plunger bolt 90 installed on both upper sides of the box 20 are fitted. That is, according to the embodiment of the present invention, the upper and lower surfaces of the slide 30 are formed with oil-using guide grooves 33 and 34 in the longitudinal direction, respectively, and are provided at the lower ends of the upper sides of the drive box 20. The play prevention ball plunger bolt 90 is installed so that the ball is fitted into the guide groove 33, respectively.

The cam 40 is rotatably mounted in the cam groove 22 of the drive box 20 to elevate the elevating plate 10 up and down and simultaneously move the slide 30 back and forth. As shown in FIG. 7, the driving pins 41 fitted into the guide slot 32 of the slide 30 and the driving groove 11 of the elevating plate 1 protrude in an eccentric state, and are geared to the center of the cam 40. A shaft hole is formed so that the motor shaft 51 of the motor 50 can be connected to each other. At this time, when the cam 40 is driven, the driving pin 41 rotates in a state of being eccentric about the motor shaft 51 to move the slide 30 back and forth while lifting the lifting plate 10 up and down. That is, the slide 30 is reciprocated back and forth by the forward and backward rotational motion of the drive pin 41, and the lifting plate 10 is moved up and down by the forward and backward rotational motion of the drive pin 41. Done.

The geared motor 50 is to drive the cam 40 in the forward and reverse, such a geared motor 50 is fixed by bolted to the outside of the drive box 20, the motor shaft 51 of the geared motor 50 Is connected in a state fitted to the shaft hole of the cam 50. At this time, when the geared motor 50 is driven two revolutions in the forward or reverse direction, the elevating plate 10 moves up and down to exactly reach the top dead center or the bottom dead center, and the slide 30 performs the reciprocating motion exactly two times back and forth. do.

The sensors S1, S2, and S3 detect the operating states of the elevating plate 10, the slide 30, and the geared motor 50. Such sensors S1, S2, and S3 are illustrated in FIG. And as shown in Figure 7 respectively installed in place of the drive box 20, the sensor (S1) detects the rising (up) state of the lifting plate 10, the sensor (S2) is the front and rear operation of the slide (30) And detects one rotation of the geared motor 50, the sensor (S3) detects the falling (down) state of the elevating plate (10). At this time, when a malfunction is detected by the sensors S1, S2, and S3, the machine is automatically stopped.

The drive gear 60 is mounted coaxially to drive the cam 40 integrally as shown in FIGS. 7 and 8, and the drive gear 60 together with the cam 40 drives the box 20. Is mounted on the cam groove 22 of the shaft, the shaft hole is formed in the center of the drive gear 60 so that the motor shaft 51 of the geared motor 50 can be fitted to connect. At this time, when the cam 40 is driven, the drive gear 60 is driven simultaneously.

The manual gear 70 is rotatably mounted as a bearing in the gear groove 23 of the drive box 20 as shown in FIGS. 7 and 8, and the drive gear 60 is engaged with the manual gear 70. And, in the central portion of the manual gear 70, the shaft hole is formed so that the manual shaft 81 of the manual handle 80 can be fitted to connect. At this time, when the drive gear 60 is driven, the manual gear 70 is driven at the same time.

The manual handle 80 is connected to the manual gear 70 as shown in Figures 7 and 8 to manually lift the lifting plate 10, the manual shaft 81 of the manual handle 80 is a manual gear It is connected in the state of being fitted in the shaft hole of the 70, the manual handle 80 is rotatably supported by the bearing cover (B), the bearing cover (B) is fixed through a plurality of bolted to the drive box (20) . In this case, when the manual handle 80 is manually driven, the manual gear 70 is driven. When the manual gear 70 is driven in this way, the cam 40 is simultaneously driven through the drive gear 60. As necessary, it is possible to manually lift the lifting plate 10 using the manual handle (80).

Referring to the overall operating relationship of the present invention configured as described above in detail.

First, Figures 1a and 9a shows a state in which the lifting plate 10 and the head 5 is accurately lowered (down) to the bottom dead center so that the needle 4 can sew a pattern on the fabric while moving up and down, As such, the slide 30 remains fully moved forward while the lifting plate 10 and the head 5 are lowered, and the two positioning pins 31 provided on the slide 30 are lifting plates. Mainly fitted in the 3 and 4 stage fixing groove 11 of the (10), respectively, the drive pin 41 of the cam 40 maintains the state close to the upper stopper 14 of the connecting passage (13). . Therefore, in this state, the two position fixing pins 31 remain fully fitted into the 3rd and 4th stage fixing grooves 11 of the elevating plate 10, and as a result, the up and down flow of the head 5 and falling This prevents the head 5 from correctly retaining the lowered (down) magnetic position.

For reference, the four fixing grooves 11 formed on the elevating plate 10 will be described by dividing them into one, two, three, and four tiers from the bottom of the convenience of explanation, and the two driving formed on the elevating plate 10. The groove 12 is described by dividing the lower stage into two stages and the upper stage.

As shown in FIGS. 1a and 9a, the lifting plate 10 and the head 5 are geared for the input and the withdrawal of the fabric, such as when the fabric is removed or the new fabric is inserted after the sewing operation is completed in the down (down) state. When the motor 50 is driven in the reverse direction (counterclockwise), as shown in FIG. 9B, the cam 40 simultaneously rotates counterclockwise about the motor shaft 51, and at the same time, the guide hole of the slide 30 is rotated. The drive pin 41 of the cam 40 fitted to the 32 rotates counterclockwise as shown while moving the slide 30 backward, and at the same time the position fixing pin 31 of the slide 30 It moves backward as shown. At this time, when the drive pin 41 rotates, the drive gear 60 rotates at the same time. When the drive gear 60 rotates, the manual gear 70 rotates at the same time, and when the manual gear 70 rotates, the manual handle 80 ) Rotates at the same time.

In the state in which the motor shaft 51 of the geared motor 50 is rotated counterclockwise by approximately 90 ° as shown in FIG. 9B, the driving pin 41 is fitted into the tip of the two-stage driving groove 12. The two positioning pins 31 are moved to the rear as shown in the end of the three- and four-stage fixing groove (11).

The drive pin 41 fitted to the tip of the two-stage drive groove 12 continues to rotate counterclockwise as shown in FIG. 9C, and continues to rotate counterclockwise in the state fitted to the two-stage drive groove 12. The lifting plate 10 is lifted upward by the driving pin 41 as shown in FIG. 9C, and at the same time, the two positioning pins 31 continue to move backwards so that the lifting plate 10 can be raised. As shown in the drawing, it exits from the 3rd and 4th stage fixing grooves 11 of the elevating plate 10 and is located in the connection passage 13. At this time, the two position fixing pins 31 are not able to support the lifting plate 10 by escaping from the 3 and 4 stage fixing grooves 11, but the driving pins 41 of the cam 40 are the two stage driving grooves 12. The elevating plate 10 does not fall because the elevating plate 10 is lifted in the state of being fitted with ().

As shown in FIG. 9C, in the state in which the motor shaft 51 is rotated about 180 ° counterclockwise, the driving pin 41 is fully fitted to the rear of the two-stage driving groove 11 and the lifting plate 10 is elevated. At the same time, the slide 30 moves completely to the rear as shown in the drawing, and in this state, when the driving pin 41 continues to rotate counterclockwise, the lifting plate 10 moves as shown in FIG. 9D. ) Continues to rise until it moves to the front end of the two-stage driving groove 12, and at the same time the two positioning pins 31 move forward to the end of the second and third stage fixing grooves 11 as shown. Is fitted.

As shown in FIGS. 9D and 9E, as soon as the driving pin 41 continuously rotates in the counterclockwise direction from the two-stage driving groove 12, the lifting of the lifting plate 10 is temporarily stopped, and the second and third stages are temporarily stopped. Only the two position fixing pins 31 fitted in the fixing grooves 11 move forward. At this time, the driving pin 41 of the cam 40 does not come out of the two-stage driving groove 12 to support the lifting plate 10, but the two positioning pins 31 are fixed in the second and third stages 11. The lifting plate 10 does not fall because it moves forward in the fitted state.

As shown in FIG. 9E, the driving pin 41 of the cam 40 is connected between the two and three stage fixing grooves 11 in a state in which the motor shaft 51 rotates about one degree in the counterclockwise direction by about 360 °. Located in, the two positioning pins 31 move completely in front of the two and three-stage fixing groove 11 as shown. At this time, as shown in FIG. 9E, when the driving pin 41 rotates once, the lifting plate 10 rises only half.

For reference, according to the present invention, any one of the position fixing pin 31 of the slide 30 or the driving pin 41 of the cam 40 must be used in the elevating plate 10 during the operation as shown in FIGS. 9A to 9I. The lifting plate 10 is securely supported by the fixing groove 11 or the driving groove 12, and the lifting plate 10 is raised while the driving pin 41 is fitted into the driving groove 12, and then the driving pin 12 is raised. When exiting the driving groove 12, the lifting and lowering of the elevating plate 10 is temporarily stopped, the position fixing pin 31 is always out of the fixing groove 12 during the ascending operation of the elevating plate 10, the connecting passage (13) Located in

As described above, when the driving pin 41 continues to rotate 360 ° one counterclockwise in the state in which the driving pin 41 rotates one direction in the 360 ° counterclockwise direction and raises the elevating plate 10 by half, FIGS. 9F to FIG. As in 9i, the driving pin 41 is fitted into the first stage driving groove 12, and ascends (ups) the elevating plate 10 to the top dead center, and then exits from the first stage driving groove 12 to connect the passage 13 At the same time, the two position fixing pins 31 are completely moved to the rear while leaving the 2 and 3 stage fixing grooves 11, and again, the 1st and 2nd stage fixing grooves 11 To be fully moved forward. At this time, the operation of the lifting plate 10, the slide 30, the cam 40 shown in Figs. 9a to 9e and the lifting plate 10, the slide 30, the cam 40 shown in Figs. 9f to 9i. ) Operation is the same, the geared motor 50 is automatically stopped after exactly two revolutions, the machine stops when a malfunction is detected by the sensor (S1) (S2) (S3) during this operation.

Figures 1b and 9i is a state in which the lifting plate 10 and the head 5 are raised (up) to the top dead center for the fabric input and withdrawal of the fabric, such as when removing the fabric or inserting a new fabric after the sewing operation is completed In this way, in the state in which the lifting plate 10 and the head 5 is raised, the slide 30 remains fully moved forward, and the two position fixing pins 31 provided on the slide 30 are shown. ) Are completely fitted into the first and second fixing grooves 11 of the elevating plate 10, and the driving pins 41 of the cam 40 are connected to the lower stopper 15 of the connecting passage 13. Keep close. Therefore, in this state, the two position fixing pins 31 remain fully fitted into the first and second stage fixing grooves 11, so that the up and down flow of the head 5 is prevented and the head 5 is prevented from falling. Accurately preserves the raised (up) magnetic position.

Next, as shown in FIGS. 1B and 9I, the geared motor 50 is rotated in a forward direction (clockwise) in order to sew a pattern on the fabric in a state in which the lifting plate 10 and the head 5 are correctly raised (up) to the top dead center. When driven in two rotations, the driving pin 41 is operated in the opposite direction to the above operation so as to accurately lower (down) the lifting plate 10 and the head 5 again to the bottom dead center as shown in FIGS. 1A and 9A.

Accordingly, according to the head up-down device of the sewing machine of the present invention, the lifting plate 10, the slide 30, the cam 40, and the geared motor 50 are removed without using an air cylinder and a compressor using air pressure as in the prior art. Since the head 5 is raised (up and down) mechanically, there is an advantage in that the head 5 can be lifted accurately and smoothly structurally.

In addition, according to the head up-down device of the sewing machine of the present invention, as described above, any one of the position fixing pin 31 of the slide 30 and the driving pin 41 of the cam 40 must be the fixing groove of the elevating plate 10. (11) or the driving groove 12 is supported to support the elevating plate 10, thereby preventing the fall of the head (5) has the advantage that the head 5 can always accurately preserve the magnetic position.

And according to the head up-down device of the sewing machine of the present invention there is an advantage that the noise is not generated because the lifting operation is made smoothly mechanically, in particular because the oil is not discharged because the air cylinder is not used as in the prior art There is an advantage to prevent the contamination of the fabric in advance, and because the structure is simple mechanically and does not use a compressor, the cost can be reduced and the space utilization is advantageous.

In addition, according to the head up-down device of the sewing machine of the present invention, if the manual handle 80 is rotated by hand without using the geared motor 50, the drive gear 60 and the cam 40 through the manual gear 70 are rotated. Because of this driving, as a result, there is an advantage that the head 5 can be manually lifted and lifted using the manual handle 80 without using electricity as necessary.

1a, 1b are front views showing the up-down state of the head according to the present invention;

2 and 3 are perspective views showing the installation of the present invention.

4 is an exploded perspective view of FIG. 3;

5 and 6 are exploded perspective view showing the main portion of the present invention.

Figure 7 is an exploded perspective view of the main portion of the present invention.

Figure 8 is a cross-sectional view showing a combined state of the present invention.

9A to 9I are exemplary views showing an operating state of the present invention.

<Code Description of Main Parts of Drawing>

1: feed shaft 2: base

3: bracket 4: needle

5: head 10: lifting plate

11: fixing groove 12: driving groove

13: connecting passage 14, 15: stopper

20: drive box 21: slide groove

22: cam groove 23: gear groove

30: slide 31: position fixing pin

32: Guide Officer 33,34: Guide Home

40: cam 41: drive pin

50: geared motor 60: drive gear

70: manual gear 80: manual handle

90: Ball Plunger Bolts S1, S2, S3: Sensor

Claims (6)

The base 2 is provided to be movable to the left and right on the feed shaft 1, and the head 5 is installed to the base 2 via a bracket 3 to support the needle 4 to move up and down. A sewing machine, comprising: a lifting plate (10) installed at one side of the bracket (3) and having a multi-stage fixed, driving groove (11) (12) and a connecting passage (13); A drive box 20 installed at one side of the base 2 and having a slide groove 21 and a cam groove 22; A slide (30) having a position fixing pin (31) fitted to the slide groove (21) and movable in the slide groove (21) and fitted into the fixing groove (11) and a guide hole (32) formed vertically; The cam 40 is rotatably mounted to the cam groove 22 and has an eccentric drive pin 41 inserted into the guide slot 32 and the driving groove 11 to operate the slide 30 and the lifting plate 10. ); Head up down device of a sewing machine including a geared motor (50) for driving the cam 40 in forward and reverse. The sewing machine of claim 1, further comprising sensors (S1) (S2) (S3) for detecting an operating state of the elevating plate (10), the slide (30) and the geared motor (50). Head up-down device. According to claim 1, wherein the fixing groove 11 of the elevating plate 10 is formed in four stages, the driving groove 12 is formed in two stages, the upper and lower portions of the connecting passage 13 drive pins ( 41. A head up-down apparatus for a sewing machine, characterized in that stoppers (14) (15) are formed to interrupt the operation of 41. According to claim 1, wherein the cam groove 22, the drive gear 60 for driving integrally with the cam 40 is mounted on the same axis, the gear groove 23 is provided below the cam groove 22 The head of the sewing machine, characterized in that the gear groove 23 is rotatably mounted to the manual gear 70 meshed with the drive gear 60, the manual gear 70 is connected to the manual handle (80). Up-down device. 2. The head up-down apparatus of a sewing machine according to claim 1, wherein the position fixing pins (31) of the slide (30) are provided in pairs in the upper and lower portions. According to claim 1, wherein the upper and lower surfaces of the slide 30 in the longitudinal direction of the oil combined guide grooves 33, 34, respectively, the upper side of the drive box 20, the ball provided at the lower end of the guide Head up-down device of a sewing machine, characterized in that the clearance prevention ball plunger bolt 90 is installed so as to fit into the groove (33).

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