TWI382111B - Motor driven sewing machine - Google Patents

Description

Motor driven sewing machine

The present invention relates to a motor-driven sewing machine that drives a spindle of a rotary sewing machine by an electric motor. In detail, the main shaft protruding from the frame to the outside of the side, and the output shaft of the drive motor disposed at the rear of the frame at a position parallel to the main shaft are transmitted through the timing pulley and the timing belt. Motor-driven sewing machine with interlocking connection.

Such a motor-driven sewing machine has been conventionally disclosed as a sewing machine disclosed in the Japanese Patent Publication No. 200105129, which is a driving motor fixedly supported by a motor mounting table (which can be detached from a side portion of a frame through a screw member) The inner surface side, and the output shaft thereof is passed through the hole formed in the motor mounting table so as to protrude from the outer surface of the motor mounting table, and the timing belt pulley of the transmission side is fixed to the protruding output shaft portion through the screw member. On the other hand, the main shaft is protruded to the outer surface side of the motor mounting base through a hole formed in the motor mounting table, and the timing belt pulley of the driven side is fixed to the protruding main shaft portion through the screw member to wind the timing belt. Set up between these two timing belts.

Such a motor-driven sewing machine can be clearly seen from the above-described contents of the publication of the Japanese Patent Publication No. 200405129, which is to arrange the drive motor at a rear portion of the frame so as to be in close proximity to the rear wall portion of the frame. This prevents the drive motor from protruding to the outside of the side of the frame and shortens the length of the sewing machine before and after, thereby simplifying the structure and miniaturization of the entire sewing machine.

However, in the case of the sewing machine, in order to perform regular inspections, adjustments, repairs, etc. on the internal mechanism of the rack, it is common to provide a cover that can be attached or detached or swayable at the wall or side wall of the frame. When the user disassembles or switches the cover for maintenance, it is necessary to ensure a large working space at the rear or side of the rack. Therefore, since the driving motor disposed in the frame is inconvenient to interfere with the operation, it is necessary to adopt a method in which only the driving motor is separately removed from the motor mounting table, or a driving motor, a motor mounting table, and two timing pulleys. A method of disassembling a component of a transmission component such as a timing belt to be removed.

Wherein, if the method of disassembling and removing the constituent elements of the latter transmission component is adopted, each time the maintenance is performed, the components of the transmission component must be sequentially removed (decomposed) one by one, and one after another after the maintenance is completed. Pre-installation (assembly) not only requires very complicated and many operation steps, but also causes the distance between the shaft of the motor output shaft and the spindle after assembly (the sewing machine is factory-prepared to ensure the quality, the manufacturer has been precisely adjusted in advance). As a result, the load tension of the timing belt changes, and the predetermined transmission performance cannot be stably reproduced. In particular, when the load tension of the belt is excessive, the frictional heat acting on the belt is abnormally increased correspondingly, causing a problem that the belt life is also adversely affected. Moreover, when the former method of removing the drive motor alone from the motor mount is used, although the operation procedure is less than that of the latter, it is necessary to loosen or lock the mounting screw while supporting the heavier drive motor. A large amount of work and labor, and even in the case of the former method, the drive motor needs to be removed after the screw member is loosened and the drive side timing pulley fixed to the motor output shaft is released from the output shaft. After the maintenance is completed, the drive motor is mounted on the motor mounting table at a predetermined position, and the screw member is again locked to the output shaft to fix the troublesome operation such as the timing pulley, and the timing pulley with the transmission side cannot be avoided. The subtle change in the distance between the shafts caused by the removal is difficult, so that it is difficult to stably reproduce the predetermined transmission performance and it is difficult to eliminate the adverse effect on the belt life.

The present invention has been made in view of the above circumstances, and an object of the invention is to provide a motor-driven sewing machine in which a drive motor is disposed at a rear portion of a frame and is in close proximity to a rear wall portion of a frame, thereby simplifying and miniaturizing the overall structure. During maintenance, the drive motor can be easily and efficiently retracted with less work effort and operating steps, and the transmission performance can be reproducibly stabilized.

In order to achieve the above object, a motor-driven sewing machine according to the present invention includes: a main shaft protruding outward from a frame; and a drive motor disposed such that the output shaft is located parallel to the main shaft. a rear mounting portion of the frame, the motor mounting table is extended rearward from the side of the frame on the protruding side of the main shaft for fixing and supporting the driving motor; and the timing pulley and the timing belt are configured to output the output shaft of the driving motor The spindle is interlocked and coupled to the outer side of the frame, and is characterized in that the drive motor can be pulled out to the frame by the rotation of the motor mounting table about the upper and lower axes. The first state outside the side portion and the second state in which the arrangement is fixed to the predetermined position at the rear of the rack are switched.

According to the invention having the above-described features, when maintenance is required, only the timing belt is removed, and the motor mounting table is rotated about the upper and lower axes to be converted so that the drive motor is pulled out and displaced to the frame. The first state of the outer side of the side, that is, the drive motor can be retracted from the front and rear of the frame, and the wide working space required for maintenance can be easily and easily performed at the rear of the rack, and when the repair is completed Rotating the motor mounting table around the upper and lower axes to convert to a second state in which the drive motor is fixed to a predetermined position at the rear of the frame, and the normal timing can be restored only by reattaching the removed timing belt. Sewing use status.

Therefore, the drive motor is disposed at the rear rear portion of the frame and is close to the rear wall portion of the frame to simplify and miniaturize the overall structure of the sewing machine. On the other hand, it is not necessary to configure the components of the transmission assembly during maintenance. One by one, many steps are assembled one by one after repair, or the timing pulley is unfastened from the motor output shaft to be removed, and the heavy drive motor is supported from the motor. The mounting table is removed, and the cumbersome and labor-intensive operation of installing the parts in sequence after maintenance can easily and efficiently drive the motor out or recover with less labor and operation steps. In addition, since only the lower shaft center of the motor mounting table is rotated, the above-mentioned exit and recovery need not change the distance between the motor output shaft of the drive motor and the shaft of the spindle, that is, the sewing machine can be surely kept. When the manufacturer has precisely adjusted the distance between the shafts, it can stably reproduce the correct and good transmission performance after maintenance. In particular, it is possible to prevent defects such as deterioration in transmission performance or belt life caused by excessive or insufficient load tension of the timing belt.

According to the motor-driven sewing machine of the present invention, as described in the second aspect of the patent application, the motor mounting base is pivotally coupled to the front fixed motor mounting table so as to be switchable between the first state and the second state. The front fixed motor mounting platform is detachably mounted to the outside of the side of the frame, that is, by extending the motor mounting platform from the outside of the side of the frame to the frame In the latter case, it is not necessary to fix the bracket for connecting the shaft support of the motor mounting base to the frame, and the like, only the drive components such as the existing drive motor, the motor mounting table, the two timing pulleys, and the timing belt are required. When it is attached to a conventional sewing machine, the simplification, miniaturization, and maintenance of the above-described overall structure can be easily achieved.

Here, as described in the third aspect of the patent application, it is preferable that the end portion of the front fixed motor mounting base and the end portion of the motor mounting base are formed with male and female fitting portions that are fitted to each other from the front and the rear. By inserting the male and female fitting portions through the shaft in the vertical direction, the motor mounting base is pivotally coupled to the fixed motor mounting base so as to be rotatable about the vertical axis.

According to the fourth aspect of the invention, the maintenance opening is formed in a rear portion of the frame in which the drive motor is disposed at a predetermined position, and the cover is detachably mounted after the opening is closed. Since the rear portion of the rack can be freely constructed, the inside of the rack can be easily repaired by opening and closing the rear cover to make the opening large.

Further, the motor mounting base is configured such that the shaft support is coupled to the rear end portion of the front fixed motor mounting base, and the front fixed motor mounting base is attached to the outside of the side of the rack so as to be fixedly detachable ( In the case of the second and third aspects of the patent application, as described in claim 5, it is preferable to provide a reinforcing member for fixing the mounting table, which can be mounted on the motor in the second state. The outer surfaces of the table and the front fixed motor mounting table are respectively fixed to the two mounting bases in a state in which the cross frame is in contact with each other to fix and hold the two mounting tables in a straight line shape. In this case, it is possible to sufficiently counteract a large torque around the upper and lower axes (acting on the motor mounting table due to the high tension applied by the timing belt during the operation of the sewing machine), so that the motor mounting table is firmly fixed and held. The established position and the established posture. Therefore, it is possible to surely prevent the output shaft of the drive motor from being displaced obliquely with respect to the main shaft due to the torque, thereby causing a variation in the distance between the shafts, and as a result, it is possible to surely prevent the transmission force of the drive motor from being transmitted to the spindle to be reduced, and even cause a timing belt. Unexpected events such as accidental disengagement.

In particular, the fixing member for fixing the mounting table is preferably formed in a substantially U-shape from the side and formed to be able to cross the frame to the upper and lower sides of the two mounting tables.

Further, in the motor-driven sewing machine of the present invention, as described in the seventh aspect of the patent application, in the front fixed motor mounting base, it is preferable to support the timing pulley of the main shaft side so as to be rotatable. The fixed position fixed to the fixed motor mounting table can be adjusted, and the distance between the shaft and the output shaft of the drive motor can be adjusted by the adjustment. In this case, by adjusting the position of the bearing relative to the motor mounting stage during initial assembly, the distance between the output shaft of the drive motor and the spindle can be easily and precisely adjusted, so that the transmission performance at the time of shipment, and thus the sewing machine The quality is good and can maintain its state for a long time.

Furthermore, the motor-driven sewing machine of the present invention, as described in claim 8 of the patent application, preferably covers the belt cover of the two timing belt pulleys and the timing belt, and is detachably mounted to the motor. Outside the table or outside the motor mounting table and the side of the frame. In this case, although the belt cover needs to be attached and detached during maintenance, it is covered with a transmission unit that is exposed at the side of the frame during normal sewing, thereby ensuring the safety of the operator and the like.

Other effects will be apparent from the description of the following examples.

Fig. 1 is a schematic perspective view of the entire motor-driven sewing machine according to the present invention. In Fig. 1, a frame consisting of a sewing machine unit 1A and a sewing machine arm unit 1B is provided from the front lower portion of the sewing machine unit 1A of the frame 1. The cylindrical head portion 2 is extended in a direction opposite to the sewing direction a (the front side of the sewing machine), and the cover 3 is detachably attached to the rear portion of the sewing machine unit 1A of the frame 1, and the rear cover 3 is assembled. The internal mechanism (not shown) in the rack 1 can open and close the opening when performing various inspections such as inspection, adjustment, and repair. In Fig. 1, the 22-line adjuster and the 23-series handwheel.

As shown in Fig. 2 and Fig. 3, a spindle 4 projects from the sewing machine unit 1A of the frame 1 to the outside of the side of the sewing machine unit 1A. On the other hand, an electric drive motor 5 is disposed at a position immediately behind the sewing machine unit 1A of the frame 1 and in close proximity to the rear cover 3, and an output shaft 5a is located at a position parallel to the main shaft 4.

A plurality of first screw members 12 are provided on the outer surface of the side of the sewing machine unit 1A of the frame 1 (four in the figure, but three or more may be provided), and the front portion is attached to the front portion so as to be detachable. The motor mounting base 11A is fixed, and the rear end portion of the fixed motor mounting base 11A at the front portion passes through the shaft 24 that penetrates the male and female fitting portions 11a and 11b (formed to be fitted from the front and rear) in the vertical direction. A motor mounting table 11B that is rotatable about its upper and lower axes is coupled, and a motorized mounting table 11B at the rear portion and a fixed motor mounting table 11A at the front portion are coupled to form a rectangular long plate-shaped motor mounting table 11 that is continuous in front and rear.

Further, in the motor mounting table 11, the inner side of the movable motor mounting table 11B on the rear side passes through a plurality of small screws 13 (four in the figure, but three or more may be provided) to securely support the drive. Motor 5. With this configuration, the rear movable motor mounting table 11B can be rotated about the axis of the vertical shaft 24 with respect to the front fixed motor mounting table 11A, whereby the drive motor 5 can be switched to the drive motor. (5) The first state shifted to the outside of the side portion of the sewing machine unit 1A and the second state in which the arrangement is fixed to the predetermined position at the rear portion of the sewing machine unit 1A are pulled out.

The output shaft 5a of the drive motor 5 penetrates through the insertion hole 14 formed in the movable motor mounting base 11B of the motor mounting base 11 and protrudes from the outer surface side of the motor mounting base 11 (11B), and the protruding output shaft 5a The timing belt pulley 9 of the transmission side is partially fixed by the small screw 7. On the other hand, a portion of the motor mounting table 11A fixed to the front portion of the motor mounting table 11 is formed with a bearing press-fitting hole 18 for transmitting the bearing 16 . And the bearing pressing member 17 rotatably supports the joint 15 (which can be fitted or detached from the side portion to the main shaft 4), and abuts against the joint 15 (the bearing fixed to the press-in hole 18 through press-fitting) The timing pulley 8 supported on the outer side and fitted to the main shaft 4 on the outer side is fixed to the main shaft 4 via a small screw 19.

A timing belt 10 is wound around the timing belt 9 on the transmission side and the timing pulley 8 on the driven side for interlocking and coupling the spindle 4 and the output shaft 5a of the drive motor 5. The load tension of the timing belt 10 is adjusted by the manufacturer to fix the bearing 16 to a fixed position of the front fixed motor mounting table 11A to precisely adjust the output shaft 5a of the main shaft 4 and the drive motor 5 through the manufacturer. The distance L between the axes (see Fig. 3) is set to the optimum value in advance.

A mounting table fixing reinforcing member 25 is provided outside the side portion of the motor mounting base 11, and the reinforcing member 25 has a motor that can be horizontally mounted when the front and rear motor mounting tables 11A and 11B are in the second state. The length of the contact between the outer surfaces of the mounting bases 11A and 11B is transmitted through the second screw member 26 while the reinforcing member 25 is laterally abutted against the outer surfaces of the front and rear motor mounting bases 11A and 11B (shown in the drawings) Four or more, but two or more motor mounting stages 11A and 11B are fixed to the front and rear, whereby the front and rear motor mounting stages 11A and 11B can be fixedly held in a straight line shape.

Further, on the outer surface side of the motor mounting base 11, the belt cover 21 covering the two timing pulleys 8, 9 and the timing belt 10 is transmitted through the bolt 21 (two in the figure, but three or more are shown). 20 installed to be able to disengage.

When the motor-driven sewing machine having the above-described configuration is used for sewing as usual, as shown in FIG. 3, before and after the motor mounting table 11, the two mounting tables 11A and 11B are placed between the outer frame and the outer frame, and are fixed by the fixing. The member 25 is fixedly held in a second state in which the front and rear are linear, and the output shaft 5a of the drive motor 5 is coupled and coupled to the main shaft 4 through the timing pulleys 8, 9 and the timing belt 10, and is driven by this state. When the motor 5 is operated, the driving torque can be transmitted to the main shaft 4 via the timing pulleys 8 and 9 and the timing belt 10 to perform a predetermined sewing operation.

Further, when the maintenance of the internal mechanism inspection, adjustment, or repair of the rack 1 is required, the bolt 21 is released from the motor mounting table 11 to remove the timing belt 10, and the second screw member is loosened. After the reinforcing member 25 is released from the motor mounting base 11, the rear movable motor mounting table 11B is rotated about the axis of the vertical shaft 24 in the direction of the arrow X with respect to the front fixed motor mounting table 11A to drive the motor 5, The rear movable motor mounting table 11B and the timing belt 9 on the transmission side are switched to be in the first state outside the side of the sewing machine unit 1A as shown in FIG. 4, so that the motor output shaft 5a becomes the main shaft. 4 orthogonal or substantially orthogonal posture, whereby the wide working space of the drive motor 5 can be removed at the rear of the sewing machine unit 1A of the frame 1, and in this state, the rear cover 3 is removed and the opening is opened. , it is easy and easy to carry out the scheduled maintenance.

Further, after the maintenance is completed, the rear cover 3 is fixed to close the opening, and the rear movable motor mounting table 11B is rotated about the axis of the upper and lower shafts 24 in the direction of the arrow Y with respect to the front fixed motor mounting table 11A, that is, the motor is driven. 5. The rear movable motor mounting table 11B and the timing belt 9 on the transmission side are switched to the second state as shown in FIG. 3, that is, the motor output shaft 5a is disposed at a predetermined position in the rear portion of the sewing machine unit 1A so that The reinforcing member 25 is placed in a parallel posture with respect to the main shaft 4, and the reinforcing member 25 is laterally abutted between the front and rear of the motor mounting bases 11A and 11B, and is fixed to the front and rear motor mounting bases 11A and 11B by the second screw member 26. The front and rear motor mounting stages 11A, 11B are fixedly held in a straight line shape, and then the belt cover 20 is fixed to the motor by winding the timing belt 10 around the two timing pulleys 8, 9 and through the bolts 21. The table 11 can be restored to the normal sewing state.

As described above, the drive motor 5 is disposed at the rear portion of the frame 1 and is in close proximity to the sewing machine unit 1A, thereby simplifying and miniaturizing the entire structure of the sewing machine. On the other hand, it is not necessary to fix the transmission unit during maintenance. The constituent elements are decomposed one by one, and many operation steps are assembled one by one after the maintenance, or the timing belt 9 of the transmission side is unfastened from the motor output shaft 5a without being repaired, and the hand is supported by one hand. The drive motor 5 is detached from the motor mount 11, and the weight of the drive motor 5 can be directly held by the rear movable motor mount 11B, and the rear movable motor mount 11B can be rotated about the axis of the upper and lower shafts 24, that is, Therefore, the drive motor 5 can be easily and efficiently withdrawn or restored with less work effort and operating steps.

Further, since the rear movable motor mounting table 11B can be rotated about the axis of the lower shaft 24 above the fixed position, there is no need to change the output shaft 5a of the drive motor 5 and the shaft of the spindle 4 at the time of the above-mentioned withdrawal and recovery. The distance L, that is, the distance between the shafts that can be precisely adjusted by the manufacturer at the time of leaving the sewing machine at the factory can be surely maintained, and the correct and good transmission performance can be stably reproduced after the maintenance. In particular, the load tension of the timing belt 10 is not excessive or insufficient, and the value at the initial adjustment can be maintained, which can prevent the deterioration of the transmission performance or the adverse effect on the belt life.

Further, in the above-described embodiment, the reinforcing members 25 for fixing the front and rear mounting bases 11A and 11B in a straight line shape are used in the front and rear, and the two motor mounting bases are provided so as to be able to cross the frame in a straight line. The length between the outer portions of the lower portions of 11A and 11B, but as shown by the imaginary line of Fig. 2, is preferably a substantially U-shaped shape when viewed from the side and can be laterally abutted against the front and rear of the two motor mounting stages 11A, 11B. Above and below. In this case, it is possible to sufficiently counteract the large torque around the upper and lower axes (the second movable state (the sewing operation state) acts on the rear movable motor mounting table 11B) due to the high tension applied by the timing belt 10 in the second state (sewing operation state). Further, the two motor mounting stages 11A and 11B can be fixed and held in a straight line shape more reliably.

Further, the reinforcing member 25 may be a rod having a square cross section, or may be a curved flat body that is bent into an L shape.

Further, in the above embodiment, the motor mounting table 11 has been described as being divided into two front and rear portions. The rear mounting base 11B is pivotally coupled to the front mounting base 11A so as to be rotatable about the axis of the vertical axis. The front mounting base 11A is configured to axially support the rear mounting base 11B so as to be rotatable around the axis of the vertical axis of the bracket fixed to the sewing machine unit 1A.

1. . . frame

1A. . . Sewing machine department

1B. . . Sewing machine arm

2. . . Cylinder head

3. . . Back cover

4. . . Spindle

5. . . Drive motor

5a. . . Output shaft

7, 13, 19. . . Small screw

8, 9. . . Timing pulley

10. . . Timing belt

11. . . Motor mounting table

11A. . . Front fixed motor mounting table

11B. . . Rear movable motor mounting table

11a, 11b. . . Male and female fittings

12. . . First screw member

14. . . Insert hole

15. . . Connector

16. . . Bearing

17. . . Bearing press

18. . . Pressing hole

20. . . Belt cover

twenty one. . . bolt

twenty two. . . Line adjuster

twenty three. . . Hand wheel

twenty four. . . Upper and lower axis

25. . . Reinforcement member

26. . . Second screw member

Fig. 1 is a schematic perspective view of the entire motor-driven sewing machine of the present invention.

Fig. 2 is an enlarged exploded perspective view of the main part.

Fig. 3 is an enlarged cross-sectional view showing the main part of a normal sewing use state.

Fig. 4 is an enlarged cross-sectional view showing the main part of the state in which the drive motor is retracted during maintenance.

1. . . frame

1A. . . Sewing machine department

4. . . Spindle

5. . . Drive motor

5a. . . Output shaft

7, 19. . . Small screw

8, 9. . . Timing pulley

10. . . Timing belt

11. . . Motor mounting table

11A. . . Front fixed motor mounting table

11B. . . Rear movable motor mounting table

12. . . First screw member

14. . . Insert hole

15. . . Connector

16. . . Bearing

17. . . Bearing press

18. . . Pressing hole

twenty four. . . Upper and lower axis

Claims (8)

A motor-driven sewing machine comprising: a main shaft protruding outward from a frame; and a drive motor disposed at a rear portion of the frame such that an output shaft is located parallel to the main shaft; the motor mounting base is The side of the frame on the protruding side of the main shaft is extended rearward for fixedly supporting the driving motor; and the timing pulley and the timing belt are configured such that the output shaft of the driving motor is coupled with the main shaft and coupled to the frame. a lateral outer position, characterized in that the drive motor can be pulled out and displaced to a state outside the side of the frame by the rotation of the motor mounting table about the upper and lower axes, and The configuration is fixed between the second state at a predetermined position at the rear of the rack. The motor-driven sewing machine according to claim 1, wherein the motor mounting base is pivotally coupled to a rear end portion of the front fixed motor mounting base so as to be switchable between the first state and the second state, The front fixed motor mounting platform is mounted on the outside of the side of the frame in a manner that can be unfastened. The motor-driven sewing machine according to the second aspect of the invention, wherein the front end portion and the front end portion of the motor mounting base are formed with male and female fitting portions that are fitted to each other from the front and the rear, respectively. By inserting the male and female fitting portions through the shaft in the vertical direction, the motor mounting base is pivotally coupled to the fixed motor mounting base so as to be rotatable about the vertical axis. The motor-driven sewing machine according to claim 1 or 2, wherein a maintenance opening is formed in a rear portion of the frame in which the drive motor is disposed at a predetermined position, and the cover is configured to be closed after the opening is closed Disassembly and assembly is free from the rear of the rack. A motor-driven sewing machine according to the second or third aspect of the invention is provided with a fixing member for fixing a mounting table, which is capable of abutting against the motor mounting table and the front fixed motor mounting table in the second state. The outer surfaces are respectively fixed to the two mounting bases in the abutting state of the cross frame to fix and hold the two mounting platforms in a straight line shape. The motor-driven sewing machine according to claim 5, wherein the fixing member for fixing the mounting base is substantially U-shaped when viewed from the side and is formed to be horizontally abutted against the upper and lower sides of the two mounting tables. form. The motor-driven sewing machine of claim 2, wherein the motor mounting table is fixed at the front portion, and the timing belt pulley on the main shaft side is supported as a rotatable bearing, and is maintained to be adjustable to be fixed thereto. The fixed position of the motor mounting table is fixed, and the distance between the shaft of the main shaft and the output shaft of the drive motor can be adjusted by the adjustment. The motor-driven sewing machine of claim 1 or 2, wherein the belt cover covering the two timing belt pulleys and the timing belt is detachably mounted on the motor mounting table or the motor mounting table and Outside the side of the rack.