JP2988009B2 - sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine for driving a needle bar and a shuttle with dedicated driving sources.

[0002]

2. Description of the Related Art Conventionally, a sewing machine that drives a needle bar and a shuttle with respective dedicated motors (hereinafter referred to as a separately driven sewing machine).
However, since this separate drive type sewing machine does not have a means for connecting the needle bar and the shuttle, the shuttle cannot be manually rotated in the case where a thread is entangled.

Therefore, the present applicant has proposed a sewing machine in which a shuttle and a hand pulley are connected to each other in a separately driven sewing machine so that the shuttle can be manually rotated when a thread is entangled.

[0004]

However, when a motor having a static torque at the time of rotation stop such as a stepping motor or a servomotor is used as a motor for driving the shuttle, the shuttle is rotated while the motor is energized. It is difficult and it is necessary to turn off the sewing machine once, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In a separately driven sewing machine, when a thread is stuck, it is possible to manually rotate a shuttle. An object of the present invention is to stop the power supply to the shuttle drive motor without turning off the power of the shuttle to facilitate the manual rotation of the shuttle.

[0006]

In order to achieve this object, another drive type sewing machine according to the present invention comprises a connecting means for connecting a shuttle and a hand pulley, a mode for manually turning the shuttle (hereinafter referred to as a manual mode). Normal sewing mode (hereinafter referred to as
A sewing mode), and a control means for controlling to stop the energization of the shuttle drive motor in the manual rotation mode.

[0007]

The separate drive type sewing machine according to the present invention having the above-described structure enables a manual rotation of the shuttle by connecting a hand pulley to the shuttle, and determines whether the sewing machine is in the manual operation mode or the sewing mode. In the manual rotation mode, the energization of the shuttle drive motor is stopped, so even if a motor that applies a static torque to the shuttle drive motor while the rotation is stopped, the shuttle can be manually rotated easily, It is possible to cope with the occurrence of thread tangling without turning off the sewing machine.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

2 and 3, a bearing 20 is mounted on a frame 8 mounted in the sewing machine bed 4 in FIG.
Is fixed to the hook 14 and is fixed to the hook 14.
9 is rotatably mounted. A pulley gear 13 is fixed to the lower end of the shuttle shaft 19, and a timing belt 18
Via a hook drive motor (not shown). The feed mechanism is omitted. The gear portion of the pulley gear 13 is always engaged with the idle gear 12 rotatably mounted on a shaft 16 fixed to the frame 8. Axis 1
6, a clutch gear 11 receiving the elastic force of a spring 17 in a vertically downward direction is rotatable, and a pin 22 fixed to the tip of a lever 23 is provided with a groove 11A of the clutch gear 11.
And the clutch gear 11 is
Moves up and down on the shaft 16.

The hand pulley 6 rotatably mounted on the shaft 15 has a part thereof exposed to the outside of the arm 4, and its gear 6A always meshes with the gear 11C of the clutch gear 11, and its rotation is controlled by the clutch gear 11 Can be transmitted to Normally, during sewing, the clutch gear 11 and the idle gear 12 do not engage with each other due to the action of the lever 23 via the pin 22 as shown in FIG. However, when the shuttle is manually turned, the operation of the lever 23 is lost as shown in FIG.
The clutch portion 11B of the clutch gear 11 is engaged with the clutch portion 12A of the idle gear 12 by the elastic force of the spring 17. When the hand pulley 6 is rotated in this state, the rotation is transmitted to the clutch gear 11, the idle gear 12, and the pulley gear 13, and the shuttle 14 is rotated. In addition, pot 1
The interlocking mechanism from 4 to the hand pulley 6 constitutes connecting means.

In FIG. 4, a slider 26 is mounted in a slider receiver 25 so as to be vertically movable, and is in a state shown in FIG. 4A during normal sewing (sewing mode). Here, a shaft 27 is fixed to the slider 26, and is engaged with one end of a lever 23 that can rotate around a shaft 24 fixed to a plate (not shown). In the state shown in the figure, the clutch gear 11
Is subjected to a downward force by the spring 17, and the force is
It is transmitted to the slider 26 via the lever 23 and the shaft 27,
The slider 26 maintains this state because the protrusion 26A is moored by the leaf spring 28.

However, when the slider 26 is manually pulled up to release the mooring, the spring 1 is released as shown in FIG.
7, the clutch gear 11 moves downward to engage with the idle gear 12, and the protruding portion 26B of the slider 26 turns the hand-turning mode switch 29 attached to the slider receiver 25 to the ON state, thereby turning the hook into the hand-turning state. (Manual mode). This manual mode switch 29
Constitutes a discriminating means for discriminating between a mode in which the handwheel can be manually turned and a normal sewing mode.

As shown in FIG. 5, a needle bar 33 is supported in the head 1 of the sewing machine shown in FIG.
A sewing needle 34 is attached to a lower end portion of the sewing machine 3. Needle bar 3
Numeral 3 is connected to the upper shaft 30 via a link mechanism 32 and a crank mechanism 31, and the upper shaft 30 is driven to rotate by a needle bar driving motor (not shown). The needle bar 33 is provided on the upper shaft 30.
Through the mechanism described above, and vertically move with respect to the rotation of the shuttle 14. The needle bar 33 and the shuttle 14 have position detecting means (not shown), and always perform timed movements with each other to enable sewing.

FIG. 6 is a block diagram of a drive type sewing machine according to this embodiment. A start / stop key 5 and a hand-operated mode switch 29 are connected to a control device (control means) 40 based on a microprocessor. Also,
A hook drive motor 45, a needle bar swing motor 46, a needle bar drive motor 47, and a feed dog drive motor 48 are connected to the control device 40 via respective drive circuits (41 to 44).

This embodiment is configured as described above. The operation of the present embodiment will be described below with reference to FIG.

The sewing machine of this embodiment is activated by the start / stop key 5 after the sewing preparation is completed (S
02: YES), after resetting each drive motor to the initial setting state (S03), sewing is performed by controlling each drive motor (S04). Then, in a state where the sewing machine has been stopped by operating the start / stop key 5 or locking the sewing machine due to the thread getting stuck (S05: YES), the manual operation mode of the shuttle is selected by the operator, and the manual operation mode switch 29 is turned on. When it comes (S06: YES), energization of the shuttle drive motor 47 of the control device 40 is stopped (S07). And
When the sewing mode is selected again by the operator and the hand-turning mode switch 29 is turned off (S08: YE
S), the control device 40 restarts energization to the shuttle drive motor (S09), and prepares for startup.

As described above, when the hand turning mode switch 29 is turned on in the hand turning state of the sewing machine of this embodiment, the CPU 40 stops the energization of the hook driving motor 41 and removes the static torque of the hook driving motor 41. , Smoothing the rotation of the shuttle 14 manually. In other words, in order to control the shuttle 14, a timely movement with the needle bar 33 is required, and strict control such as starting, stopping, and rotation angle is required. Examples thereof include a stepping motor and a servo motor. However, the stepping motor is excited when the motor is stopped, and the servo motor is subjected to feedback control when the motor is stopped. Therefore, it is difficult to manually rotate the shuttle 14 in such a state. It is necessary to do.

The discriminating means of the present embodiment is the slider 2
6. Turn the handwheel mode switch 29 to O in connection with the
N and OFF to determine whether or not the hand-turning mode is selected. In this determination means, for example, as shown in FIG. 8, the hand pulley 6 connected to the shuttle 14 via connection means (not shown) is used. Is completely stored in the bed 4 of the sewing machine, and a cover 38 is provided on the bed 4. By opening the cover 38, the hand pulley 6 and the shuttle 14 can be manually turned, and in connection with opening and closing of the cover 38. The manual mode switch 29 may be turned on and off, and although not shown, the machine frame of the sewing machine (head 1, bed 4, arm 2, pillar 3
And a switch for manually turning ON and OFF may be provided as a hand-operated mode switch, and these determination means are not specified.

[0019]

As is apparent from the above description, according to the present invention, the shuttle can be manually rotated for a sewing machine in which the needle bar and the shuttle are respectively driven by dedicated driving sources. In addition, even if a motor that applies a static torque is used as the shuttle drive motor, the shuttle can be manually turned without turning off the power of the sewing machine.

[Brief description of the drawings]

FIG. 1 is an external view of a sewing machine.

FIG. 2 is a top view of a hand turning mechanism of the shuttle of the sewing machine.

FIG. 3 is a side view of a hand turning mechanism of the shuttle of the sewing machine.

FIG. 4 is a switching mechanism diagram of a sewing mode and a hand-turning mode of the sewing machine.

FIG. 5 is a diagram of a needle bar driving mechanism of the sewing machine.

FIG. 6 is a block diagram of the sewing machine.

FIG. 7 is a flowchart of the sewing machine.

FIG. 8 is a diagram illustrating another example of the means for determining the hand-turning mode of the sewing machine;

[Explanation of symbols]

 6 Hand pulley 14 Hook 29 Handwheel mode switch 33 Needle bar 34 Sewing needle 40 Controller 45 Hook drive motor 47 Needle bar drive motor

Claims (1)

(57) [Claims] The needle bar has a needle bar which is capable of reciprocating up and down and has a sewing needle attached at a lower end thereof, and a sword tip for supplementing a thread loop formed near an eye hole of the sewing needle. A hook that rotates occasionally, in a sewing machine driven by a separate motor, a connecting means for connecting a manually rotatable hand pulley to the hook, and a mode that enables manual turning of the hook,
A sewing machine comprising: a determination unit configured to determine a mode in which normal sewing is performed; and a control unit configured to control to stop energization of the shuttle drive motor in the manual rotation mode.