JPS5941754B2 - dendo sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a controller for controlling the operation of an electric sewing machine and its related devices.The purpose of the present invention is to be able to control the rotational speed of the sewing machine, and also to be able to perform forward sewing and backward sewing by operating the pedals. The aim is to make this possible.

To perform backward stitching on a conventional sewing machine, the fabric feed teeth of the sewing machine were reversed by pressing a button for backward stitching using a feed control device built into the sewing machine mechanism, for example, but this control operation was always necessary. Since it has to be done by hand, it is difficult to handle the fabric, especially when frequent forward and backward sewing is performed, and the sewing results are poor.

The present invention has been developed to eliminate the above-mentioned drawbacks of the conventional technology, and in addition to the conventional forward stepping of the controller, the controller also performs a backward pressing operation, and during this operation, backward sewing is performed. It is possible to perform forward and backward sewing by the operation of , and the switching operation or the operation for backward sewing is made simple, so that there is no hindrance to the sewing operation such as movement of the cloth by the operator during these operations.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an operation pedal 5 of a controller as an embodiment of the present invention.
2 is a diagram showing the relationship between the operation of the pedal 5 and the sewing operation, and the position P indicated by a solid line is the released state when the pedal 5 is not operated.
At this time, the sewing machine is stopped.

Next, position P2, indicated by a chain line downward to the left, is the state in which the pedal 5 is pressed forward, and these positions P1 and P2 represent the normal sewing machine speed control range, that is, the range in which the speed is adjusted from low to high during forward sewing. Similarly, position P3, also indicated by a dashed line at the upper left, is a state in which the pedal 5 is depressed backward, and at this time the sewing machine performs backward stitching at a relatively low speed.

2 to 4 show sewing machine control circuits as embodiments of the present invention, in which 1 is the sewing machine body, 2 and 2' are AC power supplies, and 3
is an AC commutator type sewing machine motor, 3' is a permanent magnet type sewing machine motor, 4 is a sewing machine controller, 42 is a switch,
SQL is an electromagnetic solenoid that operates a backward sewing mechanism (not shown) provided in the sewing machine when the switch 42 is on.

44 is a sliding piece that allows the slider 43 to slide and makes electrical contact with it.

Each contact position P1 of the slider 43. P2. P3 is the state P1. of the pedal 5 in FIG. P2. Compatible with P3.

FIG. 2 shows an embodiment in which a variable resistor 41 such as a carbon pile or a resistance wire is used as the main element of the controller 4, and when the slider 43 is at the contact position P1, the motor 3 is Motor 3 when not energized and in P2
is operated with alternating current, and speed control is performed by adjusting the voltage supplied to the motor 3 by sliding it on a variable resistor 41.

The switch 42 is connected to a slider 43.
3 is the contact position P1. It is off when it is within the range of P2.

When the slider 43 is at the contact position P3, the switch 42 is turned on and the electromagnetic solenoid SQL is energized to operate the backward sewing mechanism. The sewing machine is operated at a constant and low speed by a half-wave rectified current through a fixed value), and the sewing machine performs backward stitching.

FIG. 3 shows another embodiment in which a semiconductor element (in this case, a triac element) is used as the main element of the controller 4, and when the slider 43 is at Pl, the motor 3 is not energized. , P2, the triac element 46 of the main semiconductor element is triggered via the trigger element 48, the motor 3 is operated with alternating current, and the triac element 46 is phase-controlled by sliding on the variable resistor 49 to increase the speed. Control takes place.

When the slider 43 is at the contact position P3, the backward sewing mechanism is operated as in FIG. 3 is operated at a constant and low speed, and the sewing machine performs backward stitching.

Note that the capacitor 47 is commonly used whether the slider 43 is at the contact position P1 or P3, and is a normal trigger circuit element.

Fig. 4 is applied to a sewing machine that can perform forward and backward sewing simply by changing the rotational direction of the sewing machine, using a permanent magnet type sewing machine motor 3', and by changing the rotational direction of the motor 3' using a controller to perform backward sewing. This is what we are trying to accomplish.

When the slider 43 is at the contact position P1, the motor 3' is not energized, and when the slider 43 is at the contact position P2, the triac element 46 is connected to the diode 451 and the trigger element 4 when the power supply 2 is at a high potential.
By triggering only one-way current through 8, the motor 3' is supplied with a half-wave rectified current in the direction of the power supply 2, motor 3', triac 46, and power supply 2' to perform forward rotation. Speed control is performed by sliding.

When the slider 43 is at the contact position P3, the triac element 4
6 is a power supply 2'h'' - when the potential is high, only the current in the opposite direction to the forward rotation is triggered via the trigger element 48, diode 45, and fixed resistor 491;
A half-wave rectified current is supplied to the triax 46, the motor 3', and the power source 2, and the sewing machine performs backward sewing by rotating in the reverse direction at a constant and low speed.

According to the present invention as described above, the sewing machine does not need to operate the backward sewing button, etc. (reverse sewing can be performed only by operating the controller, and switching operations between forward sewing and backward sewing can also be performed easily. This improves workability and allows for better sewing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between operation of a sewing machine controller pedal and sewing operation as an embodiment of the present invention, and FIGS. 2 to 4 are sewing machine control circuit diagrams showing embodiments of the present invention. In the figure, 3 is an AC commutator type sewing machine motor, 3' is a permanent magnet type sewing machine motor, 4 is a sewing machine controller, variable resistor 4L49 is each element of the variable speed control section, and diode 45 and resistor 491 are each element of the low speed control section. Element, electromagnetic solenoid SQ
Diodes 45 and 451 in L and FIG. 4 are elements of 1 drive switching means, and 5 is an operating pedal.

Claims (1)

[Claims] 1. Drive switching means for selecting either forward sewing or backward sewing based on an operation designation and enabling selective operation thereof, and for changing the sewing machine motor from low speed to high speed. a variable speed control section that controls the speed of the sewing machine motor to a low speed; a low speed control section that controls the sewing machine motor at a low speed; and a low speed control section that controls the sewing machine motor at a low speed; Alternatively, it is an operating member that disables each of the control sections in the normal return position, and when operated in one direction from the normal return position, enables the switching means to operate forward sewing. an operation pedal that enables control of the variable speed control section according to the amount of operation, and when operated in the other direction, enables the drive control means to perform backward sewing and also operates the low speed control section; Electric sewing machine provided. 2. The drive switching means consists of an electromagnetic solenoid for operating a mechanism for switching between forward stitching and backward stitching of the sewing machine,
2. The electric sewing machine according to claim 1, wherein said electromagnetic solenoid is turned on and off by operating a control pedal in one direction and in the other direction. 3. The drive switching means is provided with a diode that regulates the gate current of a bidirectional control thyristor connected in series with a permanent magnet sewing machine motor driven by an AC power source in one direction with respect to the power supply potential, and a diode that regulates it in the other direction. The variable speed control signal of the variable speed control section is supplied as the gate current via the diode regulating in one direction, and the low speed control signal of the low speed control section is supplied as the gate current via the diode regulating in the other direction. Claim 1 characterized in that the sewing machine is supplied as a sewing machine, and the sewing machine rotates in different directions depending on whether the operation pedal is operated in one direction or the other direction, thereby enabling forward sewing and backward sewing.
Electric sewing machine described in section.