JPH07289769A - Driving device for a sewing machine - Google Patents

Abstract

PURPOSE:To provide a driving device for a sewing machine preventing to transmit an impulsive force and a play in a rotational direction, and to produce a slip by connecting a rotational force transmission device for an assisting motor to a motor spindle by means of an one-way rotational clutch and by directly controlling to stop a rotational member capable of transmitting the rotation of an assisting motor. CONSTITUTION:In a low-speed rotation, a motor lever 62 is pivoted and a clutch disc 61 is pressured to contact with a break disc 66 of a rotational member 65 by the spring force of a return spring. An assisting break device 81 is released to rotate an assisting motor 78, namely, an actuator 87 is operated to lower a rod 88, and an assisting break pad 82 is spaced from the break disc 66 against the spring force of a break spring 84 through a link 85 to release the rotational member 65. The rotational speed of a motor spindle 58 is lowered by means of a timing belt 74 and an one-way rotational clutch 72 which are mechanically connected to the assisting motor 78. Furthermore, the rotational member 65 integrated with the motor spindle 58 is directly connected to the clutch disc 61. The assisting break device 81 controls the rotation of the rotational member 65.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a sewing machine, and more particularly, to a so-called clutch motor for automatically stopping a needle bar at a predetermined position, an arrangement of an auxiliary brake, and an auxiliary motor and its rotation transmission device. Related to the configuration of.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a so-called clutch motor CM as a drive device for a conventional sewing machine. The structure of a rotor R portion of a main motor MM, a clutch plate CP, a motor shaft S, and a motor pulley P is as follows. It is the same as a general clutch motor.

In this clutch motor CM, a brake plate B is rotatable with respect to a motor shaft S and a motor frame, and a helical gear G is provided on the outer circumference of the brake plate B. Further, the worm W is provided on the auxiliary motor shaft SS having the auxiliary motor SM for low speed rotation provided at one end and the magnet brake MB provided at the other end. The worm W meshes with the helical gear G.

According to this clutch motor CM, when the motor lever L is pushed down, the clutch plate CP is pressed against the flywheel F to rotate the motor shaft S and the motor pulley P at high speed, as in a general clutch motor.

On the contrary, when the motor lever L is pushed up, the clutch plate CP is brought into pressure contact with the brake plate B provided with the helical gear G. At this time, the magnet brake MB is released by a low speed signal or a needle bar fixed position signal from the outside,
Although the auxiliary motor SM rotates, the rotation of the auxiliary motor SM causes the brake plate B to rotate by the meshing of the worm W and the helical gear G. That is, the pressed clutch plate C
P, the motor shaft S, and the motor pulley P are rotated at a low speed.

Next, the signal to the auxiliary motor SM is turned off by the turning off of the low speed signal or the stop signal, and the low speed rotation of the motor pulley P is stopped by operating the magnet brake MB.

Further, a needle bar fixed position stopping device of a sewing machine using a general clutch motor is actually opened.
It is disclosed in Japanese Patent Publication No. 8 and its configuration is shown in FIG.

In FIG. 4, 1 is a sewing machine head, 19 is a general clutch motor, 14 is a low-speed rotation auxiliary motor for stopping at a fixed position, 7 is a coupling unit having a one-way rotation clutch, and 22 is a clutch motor. An actuator for moving the motor lever 20 of 19 to a position where the clutch plate does not come into contact with either the rotor side or the brake side, and 26 is a switch unit for issuing a top dead center stop command and a bottom dead center stop command signal of the needle bar. Is. Further, FIG. 5 shows the details of the actuator 22 part, and FIG. 6 shows the details of the switch unit 26 part.

Here, the auxiliary motor 14 is connected to the upper shaft 2 of the sewing machine head 1 via the coupling unit 7, and the one-way rotation clutch in the coupling unit 7 rotates in the reverse rotation direction of the sewing machine. It is composed freely.
Further, the rotation of the clutch motor 19 is transmitted to the upper shaft 2 via the flywheel 4 and the belt 37, and the pedal 36 and the motor lever 20 relay the switch unit 26 and are connected by the connecting rods 25 and 29. Switch unit 2
6 includes a top dead center stop position switch 27 and a bottom dead center stop position switch 28, and a lever 32 fixed to a connecting rod 29.
By moving up and down, the switches 27 and 28 are operated.

According to the needle bar fixed position stopping device described above, FIG.
The connecting rod 29 is also pulled down by stepping on the pedal 36 of the compression spring 34 of FIG.
Is set to be weaker than the return spring of the motor lever 20, so first, while compressing the compression spring 34, the connecting rod 2
9 and the lever 32 are lowered to turn on the switch 28. Although the connecting rod 29 is further lowered, the thrust collar 30 fixed to the connecting rod 29 hits the bracket of the switch unit 26.

When the pedal 36 is further stepped forward, the connecting rod 29, the switch unit 26, and the connecting rod 25 fixed to the bracket thereof are integrally lowered, and the thrust collar 24 fixed to the connecting rod 25 is moved to the position shown in FIG. At, the motor lever 20 is pushed down against its return spring, and finally the clutch plate in the clutch motor 19 is brought into pressure contact with the rotor to give the sewing machine a high-speed rotation. At this time, the rotation of the clutch motor 19 is transmitted to the upper shaft 2 via the belt 37 and the flywheel 4, but is not transmitted to the auxiliary motor 14 by the one-way rotating clutch in the coupling unit 7.

Next, when the pedal 36 is returned to the initial position, the series of movements described above proceeds in reverse, and finally the lever 32 fixed to the connecting rod 29 is operated by the switch 28 by the returning force of the compression spring 34. Then, the switch 28 is turned off. A command to stop the needle bar bottom dead center position is issued to the control box 35 by the ON → OFF signal of the switch 28.
As a result, first, the actuator 22 of FIG. 5 operates.

Since the actuator 22 main body is fixed to the motor lever 20 and the push-side plunger 38 is in contact with the motor frame, the actuator 22 is actuated to push down the motor lever 20. Since the pressing amount of the motor lever 20 is set to a position where the clutch plate in the clutch motor 19 does not come into contact with either the rotor side or the brake side, that is, the operation of the actuator 22 causes the motor shaft of the clutch motor 19 to move. Free to rotate.

Next, the auxiliary motor 14 is rotated to rotate the upper shaft 2 via the one-way rotating clutch in the coupling unit 7. When the upper shaft 2 continues to rotate and the bottom dead center position signal provided on the flywheel 4 or the coupling unit 7 is received, the rotation of the auxiliary motor 14 is stopped and the actuator 22 is turned off. By returning by the return spring force, the clutch plate in the clutch motor 19 is pressed against the brake plate, and the sewing machine is stopped by the brake force.

When the pedal 36 is further depressed, the connecting rod 25 and the switch unit 2 fixed to the connecting rod 25.
Since the bracket 6 is restricted from moving upward by the connecting rod 25 and the motor frame, the connecting rod 29 and the lever 32 fixed to the connecting rod 29 are compressed by the compression spring 33.
When the switch 27 is turned on, the thrust collar 31 fixed to the connecting rod 29 hits the switch bracket and is pushed up, that is, the rear depression of the pedal 36 is stopped.

When the switch 27 is turned on, a needle bar top dead center position stop command is issued to the control box 35. As a result, similarly to the bottom dead center position stopping operation described above, the actuator 22 and the auxiliary motor 14 are operated, and the top dead center position signal provided in the flywheel 4 or the coupling unit 7 is received, whereby the bottom dead center position is received. It operates in the same way as the stop operation and stops the sewing machine.

[0017]

However, the conventional clutch motor CM shown in FIG. 3 has the following problems.

The torque transmission efficiency of the auxiliary motor SM changes depending on the pressure contact force of the clutch plate CP to the brake plate B by pushing up the motor lever L or the material and surface roughness of the pressure contact surfaces of the clutch plate CP and the brake plate B. Will end up.

When abrupt braking is performed, the inertia force due to the rotation of the clutch plate CP is the helical gear G and the worm W.
It will be applied to the meshing part of and will easily become an impact force.

When shifting from a high speed operation to a low speed operation, the brake plate B rotating at a low speed is brought into contact with the clutch plate CP rotating at a high speed, so that slipping occurs and the brake plate B and the clutch plate CP are separated. Promotes wear.

Since the brake is engaged with the helical gear G and the worm W, at least the helical gear G is used.
The backlash of the worm W has a play in the rotation direction of the motor pulley P.

If the magnet brake MB becomes defective and the brake does not work, the rotation of the motor pulley P cannot be stopped. If the magnet brake MB is removed for replacement or repair, it cannot be used as a normal clutch motor.

When a failure occurs in the auxiliary motor SM or the magnet brake MB, the rotation transmitting portion from the auxiliary motor SM is composed of the helical gear G and the worm W inside the motor frame. Takes time.

Further, the conventional needle bar fixed position stopping device shown in FIGS. 4 to 6 has the following problems.

When stopping the top dead center and the bottom dead center, first, the motor lever 20 must be first pushed down to a position where the clutch plate does not come into contact with either the rotor side or the brake side, and then the auxiliary motor 14 must be operated. However, the operation becomes gradual, a series of fixed-position stop operations require time, and the cycle time is long.

In contrast to the conventional clutch motor, in addition to the two positions on the rotation side and the stop side, a neutral position which does not contact with either of them is used, so that the section must be sufficiently secured, and the pedal 36 It is not possible to extremely reduce the front stroke of the. If the stroke is to be reduced, the motor lever 2 by the actuator 22
The accuracy of the movement amount of 0 must be extremely increased.

Due to wear of the clutch plate and the brake plate,
Alternatively, since the position of the motor lever 20 changes due to replacement of parts due to the abrasion, the position adjustment of the actuator 22 with respect to the motor lever 20 is required.

If the return spring pressure of the motor lever 20 is adjusted to be extremely strong, the operation of the actuator 22 becomes insufficient, so that the clutch plate cannot be completely separated from the brake plate, and the motor shaft 14 is overloaded by the brake. In order to rotate the auxiliary motor 14 under
The one-way rotating clutch in the auxiliary motor 14 or the coupling unit 7 is damaged.

Therefore, an object of the present invention is to prevent the impact force due to the rotational inertial force of the clutch plate in a sudden brake from being transmitted to the rotation transmitting portion from the auxiliary motor, and to prevent the rotation from the auxiliary motor while the rotation is stopped. Prevents rattling of the transmission part from being transmitted as rattling in the direction of rotation of the motor pulley, and also prevents slipping between the brake plate and clutch plate when shifting from high-speed operation to low-speed operation. It is an object of the present invention to provide a drive device of a sewing machine that can obtain torque transmission efficiency and is excellent in maintainability.

[0030]

In order to solve the above problems, the present invention provides a main motor, an auxiliary motor, a motor shaft, a flywheel integrally provided on a rotor of the main motor, and the flywheel. A clutch plate that is integrally provided on the motor shaft so as to face the motor shaft, a rotary member that is rotatable about the motor shaft on the side opposite to the flywheel with the clutch plate sandwiched between the rotary plate, and the auxiliary motor. A rotation transmission device capable of transmitting rotation from the motor shaft, a motor pulley provided at an outer end portion of the motor shaft, and a motor lever capable of moving the motor shaft. The clutch plate is operated by operating the motor lever. To a drive device of a sewing machine in which the rotation of the motor pulley is transmitted to the main shaft of the sewing machine via a belt by press-contacting the flywheel or the rotating member with each other. There are, together with an auxiliary braking device to be stopped by braking the rotary member directly,
The auxiliary motor and the rotation transmission device are arranged outside, the rotation transmission device is connected to the outer end portion of the motor shaft, and further, between the rotation transmission device and the outer end portion of the motor shaft, The present invention is characterized in that a one-way rotation clutch, which is rotatable in the opposite direction to the rotation direction of the rotor, is provided.

The auxiliary brake device is, for example,
It has a spring for holding the rotating member in a braking state.

The rotation transmission device is, for example, a timing belt device provided between the auxiliary motor shaft and the outer end portion of the motor shaft, and the timing pulley of the timing belt device is rotated in the one direction. It is characterized in that it is arranged on the outer end of the motor shaft via a clutch.

[0033]

According to the present invention, the rotation transmission device from the auxiliary motor and the motor shaft are connected via the one-way rotation clutch which is rotatable in the direction opposite to the rotation direction of the rotor, and the rotation is free about the motor shaft and is assisted. Since the rotating member that can transmit the rotation from the motor is directly braked by the auxiliary brake device and stopped, the impact due to the rotational inertia force of the clutch plate is applied to the rotation transmitting part from the auxiliary motor to the motor shaft against sudden braking. No force is applied, and rattling of the rotation transmitting portion from the auxiliary motor to the motor shaft when the rotation is stopped is not transmitted as rattling in the rotation direction of the motor pulley.

Since the motor shaft is not freely rotatable by setting the motor lever to the neutral position,
Regardless of the amount of movement of the motor lever and the return spring force of the motor lever, it is possible to stably and freely rotate a motor shaft provided with a flywheel provided on the rotor of the main motor or a clutch plate that is brought into pressure contact with a rotating member.

Further, an auxiliary motor and a rotation transmission device capable of transmitting the rotation of the auxiliary motor to the rotating member are arranged outside,
Since the rotation transmission device is connected to the outer end of the motor shaft, the rotation transmission device and the auxiliary motor can be easily removed.

Moreover, since the one-way rotating clutch, which is free to rotate in the direction opposite to the rotating direction of the rotor, is interposed between the motor shaft and the rotation transmitting device, for example, when shifting from high speed operation to low speed operation, an auxiliary When the brake is released and the rotating rotating member is brought into contact with the rotating rotating clutch plate, the rotating member (brake plate) follows the rotation of the clutch plate, and the clutch plate, the motor shaft and the motor pulley are
Due to the inertial resistance of the brake plate and the resistance of the one-way rotating clutch portion provided between the brake plate and the rotation transmitting device, the rotation speed shifts to low speed, and slipping does not occur between the clutch plate and the brake plate.

Moreover, since the rotation of the auxiliary motor that rotates at a low speed is directly transmitted to the motor shaft and the motor pulley via the one-way rotation clutch, the clutch plate is rotated to the rotating member (brake plate) by pushing up the motor lever. The torque transmission efficiency of the auxiliary motor is stable regardless of the pressure contact force or the material and surface roughness of the pressure contact surfaces of the clutch plate and the rotating member (brake plate).

If the auxiliary brake device is provided with a spring that holds the rotating member in a braking state, the braking performance can be maintained by the spring force of the auxiliary brake spring, even if the actuator fails.

Further, if the timing belt device connected to the outer end of the motor shaft is used as the rotation transmission device from the auxiliary motor, the rotational inertia of the clutch plate at the meshing portion of the timing pulley and the timing belt against a sudden braking. The impact force is not applied, and the play of the meshing portion between the timing pulley and the timing belt while the rotation is stopped and the deflection of the timing belt are not transmitted as play in the rotation direction of the motor pulley.

Moreover, by disposing the timing pulley on the outer end portion of the motor shaft through the one-way rotating clutch, for example, the auxiliary brake is released and the rotating member is rotated at a high speed. When the existing clutch plate is brought into contact, the rotating member (brake plate) follows the rotation of the clutch plate, and the one-way rotating clutch that is free to rotate in the direction opposite to the rotor rotation direction causes the clutch plate and motor shaft to move against the timing pulley. Since it is freely rotatable in the rotor rotation direction, the auxiliary motor is started regardless of the high speed rotation of the clutch plate, and low speed rotation is given to the timing pulley.The clutch plate, motor shaft and motor pulley are Due to the resistance and the resistance of the one-way rotation clutch unit, the low speed rotation is started.

An auxiliary motor and a timing belt for transmitting the rotation thereof are arranged outside the motor frame,
Since the timing pulley is provided on the outer end of the motor shaft, the timing pulley, the timing belt, and the auxiliary motor can be easily removed.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a driving device for a sewing machine according to the present invention will be described below with reference to FIGS.

First, FIG. 1 shows a clutch motor portion as an example to which a driving device for a sewing machine according to the present invention is applied, showing a first embodiment, in which 50 is a clutch motor, 51 is a motor frame, and 52 is a motor frame. Is the rotor of the main motor,
55 is a flywheel, 56 is a slide sleeve, 58
Is a motor shaft, 59 is a motor pulley, 61 is a clutch plate,
62 is a motor lever, 64 is a motor lever return spring, 6
5 is a rotary member, 66 is a brake plate, 72 is a one-way rotary clutch, 73 is a timing pulley, 74 is a timing belt, 75 is a gear, 76 is an auxiliary motor shaft, 77 is a rotation transmission device, 78 is an auxiliary motor, and 81 is Auxiliary braking device,
82 is an auxiliary brake pad, 84 is an auxiliary brake spring,
87 is an actuator.

As shown in the figure, the clutch motor 50 accommodates a rotor 52 of a main motor in a motor frame 51, and a rotor shaft 53 thereof is rotatably supported by bearings 54, 54. A flywheel 55 is integrally provided at the right end of the rotor shaft 53 in the figure. A slide sleeve 56 is slidably incorporated in the right end portion of the motor frame 51 in the figure, and a motor shaft 58 is rotatably supported in the slide sleeve 56 via bearings 57, 57. The motor shaft 58 and the rotor shaft 53 are arranged on the same axis.

The motor shaft 58 is connected to the motor frame 51.
A motor pulley 59 is integrally provided at an outer end portion projecting from the outside, and a clutch plate 61 is integrally provided at an inner end portion projecting into the motor frame 51. The clutch plate 61 faces a position facing the flywheel 55.
A belt (not shown) is hung on the motor pulley 59, and the belt is also hung on a pulley provided on the upper shaft of the sewing machine head as is well known (not shown).

A motor lever 62 is connected to the slide sleeve 56. This motor lever 6
2 is swingable around a pin 63 that supports a motor lever 62 on a motor frame 51. The connecting portion of the motor lever 62 with the slide sleeve 56 and the pin 6
3, one end of a motor lever return spring 64 by a tension coil spring for biasing the slide sleeve 56 to the right in the figure is locked. The other end of the motor lever return spring 64 is locked to the right side of the motor frame 51 in the figure.

On the shaft of the motor shaft 58 between the slide sleeve 56 and the clutch plate 61,
The rotating member 65 is assembled to be freely rotatable (rotatably). The rotating member 65 has a brake plate 66 on the left side in the drawing.
Are integrally formed. The rotating member 65 is rotatably supported by the motor frame 51 via a bearing 67 on the right side in the drawing.

Further, on the outer end portion of the motor shaft 58, the bush 7 is provided on the right side of the motor pulley 59.
1 is fixed by a fixing nut 69. A timing pulley 73, which is a toothed pulley, is mounted on the bush 71 via a one-way rotating clutch 72 which is rotatable in the opposite direction of the rotor 52.
Therefore, the motor shaft 58 and the clutch plate 61 are freely rotatable in the rotation direction of the rotor 52 with respect to the timing pulley 73.

Further, the timing pulley 73 has
A timing belt 74, which is a toothed belt, is hung on and engaged with each other. The timing belt 74 is also engaged with and meshed with a gear 75. The gear 75 is integrally provided on the auxiliary motor shaft 76. This auxiliary motor shaft 7
Auxiliary motor 78 having 6 is fixed to the outer peripheral surface of motor frame 51 via bracket 79. Thus, in order to transmit the rotation from the auxiliary motor 78 to the motor shaft 58, the rotation transmission device 77 including the gear 75 of the auxiliary motor shaft 76, the timing belt 74, and the timing pulley 73 is provided.

An auxiliary braking device 81 for braking the brake plate 66 is also provided. The auxiliary brake device 81 is provided with an auxiliary brake pad 82, which comes into pressure contact with the outer peripheral surface of the brake plate 66, integrally with a rod 83, and the auxiliary brake pad 82 is wound around the rod 83 so that the auxiliary brake pad 82 is provided on the outer peripheral surface of the brake plate 66. An auxiliary brake spring 84, which is a compression coil spring for urging the surface in a pressure contact direction,
It is interposed between the auxiliary brake pad 82 and the outer peripheral portion of the motor frame 51.

The left end of the link 85 in the figure is connected to the outer end of the rod 83 protruding from the outer periphery of the motor frame 51. The link 85 includes a pin 86 that supports the motor frame 51 at substantially the center of the link 85.
It can freely swing around. An actuation rod 88 of an actuator 87 is connected to the right end of the link 85 in the figure. The actuator 87 is fixedly provided on the outer peripheral surface of the motor frame 51. The actuator 87 is any one of a solenoid, an air cylinder, and a hydraulic cylinder, and may be any other drive source.

The clutch motor 5 having the above structure
The operation of 0 will be described below.

First, the rotor 52 of the main motor is rotating at high speed, and the auxiliary motor 78 is in a stopped state. Further, at this time, the actuator 87 of the auxiliary brake device 81 is in a non-actuated state, and therefore the auxiliary brake pad 82 is
The compression spring force of the auxiliary brake spring 84 maintains the pressure contact with the outer peripheral surface of the brake plate 66. That is, the rotating member 65 is directly braked by the auxiliary brake device 81 and is in a stopped state.

In the above state, the motor lever 62 is moved to the pin 6
The slide sleeve 56 is moved to the left side in the drawing against the tension spring force of the motor lever return spring 64, and the motor shaft 58 is also moved integrally with the motor shaft 58. The integral clutch plate 61 is brought into pressure contact with the flywheel 55 integral with the rotor 52 of the main motor.
Therefore, the rotor 52 of the main motor and the motor shaft 58 are directly connected, that is, the motor pulley 59 integrated with the motor shaft 58 is in a high-speed rotation state.

When a low speed rotation is applied, for example, when the needle bar (not shown) is stopped at the top / bottom dead center position, the motor lever 62 is oscillated in the opposite direction to pull the motor lever return spring 64. With the spring force, the clutch plate 61 is pressed against the side surface of the brake plate 66 of the rotating member 65. At this time, the auxiliary brake device 81 is released by the low speed signal or the needle bar fixed position signal from the outside, and the auxiliary motor 78 rotates.

That is, the actuator 87 is actuated, and the actuating rod 88 is retracted and moved downward to move the pin 8 of the link 85.
After swinging about 6 times and moving the rod 83 upward, the auxiliary brake pad 82 is separated from the outer peripheral surface of the brake plate 66 against the compression spring force of the auxiliary brake spring 84, and the rotating member 65 is freely rotated. To do. Then, the auxiliary motor 78 starts driving, and the gear 75 provided on the auxiliary motor shaft 76 is started.
The motor shaft 58 rotates at low speed via the timing belt 74, the timing pulley 73, the one-way rotation clutch 72, and the bush 71.

Therefore, since the clutch plate 61 is pressed against the side surface of the clutch plate 66 of the rotating member 65 as described above, the clutch plate 61 and the rotating member 6 integral with the motor shaft 58 are formed.
5, the motor pulley 59 integrated with the motor shaft 58 is in a low speed rotation state.

Then, the driving of the auxiliary motor 78 is stopped by the OFF of the low speed signal or the stop signal, and the rotating member 65 is directly braked and stopped again by the operation of the auxiliary brake device 81. Therefore, the low speed rotation of the motor pulley 59 is stopped.

According to the sewing machine drive apparatus described in the first embodiment, the following effects can be obtained.

In order to solve the problem with the conventional clutch motor shown in FIG. 3, the timing pulley 73 and the brake plate 66 are connected via the one-way rotation clutch 72, and moreover, the brake plate 66 is supplemented with an auxiliary brake. Since the braking force is applied by the device 81, the impact force due to the rotational inertial force of the clutch plate 61 due to the sudden braking is not transmitted to the timing pulley 73 and the timing belt 74, and the timing belt 74 is flexed while the rotation is stopped. Is not transmitted as looseness in the rotation direction of the motor pulley 59.

In order to solve the problem with the conventional clutch motor shown in FIG. 3, when shifting from high speed operation to low speed operation, the auxiliary brake device 81 is released and the brake plate 66 that is not rotating rotates at high speed. When the engaged clutch plate 61 is brought into contact with the clutch plate 61, the brake plate 66 is released.
Follow the rotation of. Further, since the one-way rotation clutch 72 is freely rotatable in the direction opposite to the rotation direction of the rotor 52, that is, the clutch plate 61 and the motor shaft 58 are provided so as to be freely rotatable in the rotation direction of the rotor 52 with respect to the timing pulley 73. The auxiliary motor 78 can be started regardless of the high speed rotation of the clutch plate 61, that is, the timing pulley 73 can be rotated at a low speed. Here, the clutch plate 61, the motor shaft 58, and the motor pulley 59 are connected to the brake plate 66.
Due to the inertial resistance and the resistance of the one-way rotation clutch 72, the low speed rotation is started. Therefore, there is no slipping between the clutch plate 61 and the brake plate 66, and accelerated wear of the brake plate 66 and the clutch plate 61 is suppressed.

In contrast to the problem with the conventional clutch motor shown in FIG. 3, the auxiliary motor 7 that rotates at a low speed is used.
Since the rotation of 8 is directly transmitted to the motor shaft 58 and the motor pulley 59 via the one-way rotation clutch 72,
The torque transmission efficiency of the auxiliary motor 78 is stable regardless of the pressure contact force of the clutch plate 61 to the brake plate 66 by pushing up the motor lever 62 or the material and surface roughness of the pressure contact surfaces of the clutch plate 61 and the brake plate 66. ing.

In contrast to the problem with the conventional clutch motor shown in FIG. 3, the auxiliary motor 78 and the timing belt 74 and timing pulley 73 for transmitting the rotation thereof are provided outside the motor frame 51 and the motor shaft 58.
Since it is located at the forefront, it is easy to remove, hassle free repair and replacement, and has good maintainability.

In contrast to the problems associated with the conventional needle bar fixed position stopping device shown in FIGS. 4 to 6, the motor shaft 58 is not freely rotatable by setting the motor lever 62 to the neutral position. Therefore, regardless of the movement amount of the motor lever 62, that is, the movement amount of the clutch plate 61 and the return spring force of the motor lever 62, the motor shaft 58 can be stably rotated freely.

In contrast to the problem with the conventional clutch motor shown in FIG. 3, even if the actuator 87 fails, the braking force is maintained by the spring force of the auxiliary brake spring 84. Therefore, even if the actuator 87 is removed for replacement or repair, the function as the clutch motor 50 remains.

Next, a second embodiment of the present invention shown in FIG. 2 will be described. In the second embodiment, only the structure of the auxiliary brake device 81 is different from that of the first embodiment, and therefore, the same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Then, only the differences from the first embodiment will be described.

In the second embodiment, as shown in the figure, the auxiliary brake device 81 for braking the brake plate 66 has an auxiliary brake pad 8 which is pressed against the outer peripheral surface of the brake plate 66.
The left end portion of the bell crank 185 in the figure is connected to the outer end portion of the rod 83 integrally provided with 2 protruding from the outer peripheral portion of the motor frame 51. An auxiliary brake spring formed of a compression coil spring for urging the auxiliary brake pad 82 in a direction away from the outer peripheral surface of the brake plate 66 by winding around the portion of the rod 83 protruding from the outer peripheral portion of the motor frame 51. 184 is interposed between the outer peripheral portion of the motor frame 51 and the illustrated left end portion of the bell crank 185.

The bell crank 185 is swingable around a pin 186 which supports the substantially central portion of the bell crank 185 on the motor frame 51. An actuating rod 188 of an actuator 187 is connected to the upper end of the bell crank 185 in the figure. The actuator 187 is provided on the left side of the bell crank 185 in the drawing, on the outer peripheral surface of the motor frame 51.
It is fixedly provided through 9. The actuator 187 is also a solenoid, an air cylinder, or a hydraulic cylinder, as in the first embodiment, and may be any other drive source.

In such an auxiliary brake device 81 of the second embodiment, the forward / backward movement of the operating rod 188 of the actuator 187 is opposite to that of the first embodiment. That is, when the actuator 187 of the auxiliary brake device 81 is actuated, the actuating rod 188 is pulled and moves leftward, and the bell crank 185 swings around the pin 186 and the compression spring force of the auxiliary brake spring 184 of the rod 83 is lowered. After the movement, the auxiliary brake pad 82 is brought into pressure contact with the outer peripheral surface of the brake plate 66, and the rotating member 65 is directly braked to be in a stopped state.

When the auxiliary brake device 81 is released, the actuator 187 is deactivated, the operating rod 188 advances and moves right, and the pin 1 of the bell crank 185 is released.
After swinging around 86 and moving the rod 83 upward, the auxiliary brake pad 82 is also assisted by the compression spring force of the auxiliary brake spring 184 and is separated from the outer peripheral surface of the brake plate 66, so that the rotating member 65 is free to rotate. become. The other operations and the like are the same as those described in the first embodiment.

Auxiliary brake device 81 of the above second embodiment
With the clutch motor 50 including the above, among the effects obtained by the driving device for the sewing machine described in the first embodiment, the above effects 1 to 3 can be obtained except the above effects.

In the above embodiments, the driving device for the sewing machine is the clutch motor. However, the present invention is not limited to this, and the driving device for the sewing machine may be another clutch or motor. Good. Further, the model of the sewing machine to which the present invention is applied is also arbitrary, and it is needless to say that the specific detailed structure and the like such as the rotation transmission device from the auxiliary motor to the rotating member can be appropriately changed.

[0073]

As described above, according to the driving device for a sewing machine of the present invention, the rotation transmission device from the auxiliary motor and the one-way rotation clutch that freely rotates the motor shaft in the direction opposite to the rotation direction of the rotor are provided. Is connected to the motor shaft to directly stop and brake the rotating member that can freely rotate around the motor shaft and transmit rotation from the auxiliary motor. Make sure that the impact of the rotational inertia of the clutch plate is not applied to the rotation transmitting part, and that the play of the rotation transmitting part from the auxiliary motor to the motor shaft that is not rotating does not transmit as play in the rotation direction of the motor pulley. You can

Since the motor shaft is not freely rotatable by setting the motor lever to the neutral position,
Regardless of the amount of movement of the motor lever and the return spring force of the motor lever, the flywheel provided on the rotor of the main motor or the motor shaft provided with a clutch plate that is brought into pressure contact with the rotating member can be stably rotated freely.

Further, an auxiliary motor and a rotation transmitting device capable of transmitting the rotation of the auxiliary motor to the rotating member are arranged outside,
Since the rotation transmission device is connected to the outer end of the motor shaft, the rotation transmission device and the auxiliary motor can be easily removed. Therefore, it does not take time and trouble to repair and replace them, and maintainability is excellent.

Moreover, since the one-way rotating clutch, which is free to rotate in the opposite direction to the rotating direction of the rotor, is provided between the motor shaft and the rotation transmitting device, for example, when shifting from high speed operation to low speed operation, the auxiliary brake is used. When the clutch plate that is rotating at high speed is brought into contact with the rotating member that is not rotating, the rotating member (brake plate) follows the rotation of the clutch plate, and the clutch plate, the motor shaft, and the motor pulley are
Due to the inertial resistance of the brake plate and the resistance of the one-way rotating clutch provided between the brake plate and the rotation transmitting device, the low speed rotation is started, so that slipping does not occur between the clutch plate and the brake plate. Therefore, accelerated wear of the brake plate and the clutch plate can be suppressed.

Moreover, since the rotation of the auxiliary motor rotating at a low speed is directly transmitted to the motor shaft and the motor pulley through the one-way rotation clutch, the pressing force of the clutch plate to the rotating member (brake plate) by pushing up the motor lever. Alternatively, the torque transmission efficiency of the auxiliary motor can be stabilized regardless of the material and surface roughness of the pressure contact surfaces of the clutch plate and the rotating member (brake plate).

According to the second aspect of the invention, by providing the auxiliary brake device having the spring for holding the rotating member in the braking state, for example, even when the actuator is defective, the spring force of the auxiliary brake spring is used. Braking performance can be maintained. Therefore, for example, even when the actuator is removed for replacement or repair, the function as the clutch motor can be retained.

When the timing belt device connected to the outer end portion of the motor shaft is used as the rotation transmission device from the auxiliary motor as described in claim 3, the timing pulley and the timing belt are prevented from being abruptly braked. No impact force is applied to the meshing part due to the rotational inertia of the clutch plate, and the play of the meshing part between the timing pulley and the timing belt while the rotation is stopped and the deflection of the timing belt are not transmitted as play in the rotation direction of the motor pulley. .

Further, as described in claim 3, by disposing the timing pulley on the outer end portion of the motor shaft via the one-way rotation clutch, for example, the auxiliary brake is released and the motor is rotated. When a clutch plate that is rotating at high speed is brought into contact with a rotating member that does not rotate, the rotating member (brake plate) follows the rotation of the clutch plate, and the one-way rotating clutch that is free to rotate in the direction opposite to the rotor rotation direction causes the clutch plate and Since the motor shaft is provided so as to freely rotate in the rotor rotation direction with respect to the timing pulley, the auxiliary motor is started regardless of the high speed rotation of the clutch plate, and the low speed rotation is given to the timing pulley. Also, the motor pulley starts shifting to low speed rotation due to the inertial resistance of the brake plate and the resistance of the one-way rotation clutch section. Therefore, it is possible to prevent the slipping from occurring between the clutch plate and the brake plate, and suppress the accelerated wear of the brake plate and the clutch plate.

Further, as described in claim 3, the auxiliary motor and the timing belt for transmitting the rotation thereof are arranged outside the motor frame, and the timing pulley is provided at the outer end portion of the motor shaft. The pulley, the timing belt, and the auxiliary motor can be easily removed. Therefore, it does not take time and effort to repair and replace them, and the maintainability is excellent.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a first embodiment of a clutch motor portion to which a driving device for a sewing machine according to the present invention is applied.

FIG. 2 is a schematic vertical sectional view showing a clutch motor portion of a second embodiment to which the invention is applied.

FIG. 3 is a schematic vertical cross-sectional view showing an example of a so-called clutch motor as a drive device for a conventional sewing machine.

FIG. 4 is a schematic front view showing an example of a needle bar fixed position stopping device of a conventional sewing machine.

5 is an enlarged view showing details of an actuator portion of the stop device shown in FIG.

FIG. 6 is an enlarged view showing details of a switch unit portion of the stop device shown in FIG.

[Explanation of symbols]

 50 clutch motor 51 motor frame 52 main motor rotor 55 flywheel 56 slide sleeve 58 motor shaft 59 motor pulley 61 clutch plate 62 motor lever 64 motor lever return spring 65 rotating member 66 brake plate 72 one-way rotating clutch 73 timing pulley 74 timing belt 75 Gears 76 Auxiliary Motor Shaft 77 Rotation Transmission Device 78 Auxiliary Motor 81 Auxiliary Brake Device 82 Auxiliary Brake Pad 84 Auxiliary Brake Spring 87 Actuator 184 Auxiliary Brake Spring 187 Actuator

Claims (3)

[Claims] 1. A main motor, an auxiliary motor, a motor shaft, a flywheel integrally provided on a rotor of the main motor, and a clutch plate integrally provided on the motor shaft so as to face the flywheel. A rotary member that is free to rotate around the motor shaft on the side opposite to the flywheel with the clutch plate interposed therebetween; a rotation transmission device capable of transmitting rotation from the auxiliary motor to the rotary member; A motor pulley provided on the outer end of the shaft and a motor lever that allows the motor shaft to be moved and operated. By operating the motor lever, the clutch plate is brought into pressure contact with the flywheel or the rotating member, and the motor pulley is moved. In a drive device for a sewing machine, which transmits the rotation of the rotary shaft to a main shaft of the sewing machine via a belt, the rotary member can be directly braked to be stopped. An auxiliary brake device is provided, the auxiliary motor and the rotation transmission device are arranged outside, and the rotation transmission device is connected to an outer end portion of the motor shaft. A driving device for a sewing machine, wherein a one-way rotation clutch that is rotatable in a direction opposite to a rotation direction of the rotor is provided between the end portion and the end portion. 2. The driving device for a sewing machine according to claim 1, wherein the auxiliary braking device has a spring that holds the rotating member in a braking state. 3. The rotation transmission device is a timing belt device provided between the auxiliary motor shaft and an outer end portion of the motor shaft, wherein a timing pulley of the timing belt device is connected to the one-way rotation clutch. The drive device for a sewing machine according to claim 1 or 2, wherein the drive device is arranged on the outer end portion of the motor shaft via the drive shaft.