JP2687460B2 - Sewing machine drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a sewing machine with a cloth presser mechanism.

2. Description of the Related Art In recent years, sewing machine drive devices have been able to operate the presser foot lifting mechanism, automatic thread trimming mechanism, reverse feed stitching mechanism, etc. of sewing machines using pneumatic pressure and electromagnetic force to improve work efficiency and quality by unskilled personnel. In general, it is possible to drive the motor while controlling the speed to stop the motor at a fixed position.

Hereinafter, an example of the above-described conventional sewing machine driving device will be described with reference to the drawings.

FIG. 2 shows a general arrangement of the sewing machine drive unit and the sewing machine, and FIG. 3 shows the main structure of the sewing machine head of FIG. FIG. 4 is a block diagram of a conventional example.

The operation of the sewing machine driving device configured as described above will be described below.

First, in FIG. 2, the sewing machine 1 is connected to the motor 3 via the belt 2.
Driven by The movement of the pedal 4 is detected by the pedal sensor 5 and transmitted to the sewing machine control means 7 provided in the control device 6, and the sewing machine control means 7 controls the drive means 8 to drive the motor 3
(Sewing machine 1) is driven and stopped at a fixed position by a signal from the position detector 9. On the other hand, the cloth presser lifting mechanism 10 (shown in FIG. 3) for lifting the cloth presser foot 10h that holds the cloth against the feed dog (not shown) of the sewing machine during sewing when the cloth is taken in and out or the cloth is turned. The respective mechanisms 10b to 10h shown) are driven by applying an output voltage for driving FL to a cloth presser lifting (hereinafter referred to as FL) solenoid 10a. This operation will be described with reference to FIG. The FL drive means 12 operates the pedal return signal of the pedal sensor 5, the operation of switches such as the knee switch 13 and the step switch (not shown), or the sewing machine control means 7 controls the pattern sewing operation for the regular sewing work. It is commanded by a signal that is automatically issued when the FL mechanism 10 is operated during operation. Generally, the FL mechanism requires a relatively large solenoid as a power source among the various mechanisms of the sewing machine. In addition, they often operate continuously for a relatively long time. Therefore, the FL solenoid 10a
In order to reduce the load on the power supply (not shown) of the FL drive means 12, as shown in the output voltage of the FL drive means 12 in FIG.
The FL drive means 12 often draws the solenoid at a high voltage for a period "T" sufficient to operate the solenoid, and then outputs a voltage as low as necessary to hold the solenoid.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, with the above-described configuration, it has been difficult to realize FL drive means suitable for FL mechanisms and solenoids of various sewing machines.

Means for Solving the Problems In order to solve the above problems, a sewing machine drive device of the present invention is a sewing machine having a cloth presser lifting mechanism, a control means for controlling the sewing machine, and a cloth driving the cloth presser lifting mechanism. A presser foot lifting drive device and an input device operated by an operator,
The cloth presser lifting drive device outputs a relatively high first level voltage in response to a command from the input means, and outputs a first level voltage in a command from the control means for a predetermined time, and then a relatively low second level voltage.
It is designed to output a level voltage.

Action The present invention has the above-described configuration, and when the FL solenoid is driven by the action of the sewing machine controller, the FL solenoid may operate continuously for a long time.Therefore, the solenoid is held at a low voltage to prevent temperature rise and power loss. Therefore, the solenoid can be reliably operated with a high voltage for direct operation by the operator.

Embodiment Hereinafter, a sewing machine driving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of the present embodiment. The difference from the conventional example is that the FL drive means 14 has two input means, input A and input B, and an operator such as a pedal sensor 5 or a switch 13 Is connected to the input A with a signal to be directly operated, and to the input B with a signal that is automatically output like the signal from the sewing machine control means 7.

The FL drive means 14 outputs a high voltage with respect to the signal of the input A, and the FL drive means outputs a high voltage with respect to the signal of the input B for a time "T" and thereafter outputs a low voltage.

As described above, according to the embodiment, since a high voltage is applied to the FL solenoid 10a in the command directly operated by the operator, a wide variety of FL solenoids 10a can be reliably driven, and a command for a long time can be given. For automatic operation with a low voltage, lower the temperature rise of the solenoid
The load on the power source of the driving means 14 is reduced.

As described above, the present invention has an effect that a wide variety of solenoids of a sewing machine can be driven without having to readjust or replace the FL drive means.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a sewing machine driving device in an embodiment of the present invention, FIG. 2 is a layout diagram of a general sewing machine and a sewing machine driving device, FIG. 3 is a detailed view of a general sewing machine head, and FIG.
The figure is a block diagram of a sewing machine drive device in a conventional example.
FIG. 5 is a waveform diagram showing the output voltage of the FL driving means. 1 ... Sewing machine, 3 ... Motor, 6,15 ... Control device, 10a
~ 10h …… Cloth lifting mechanism (FL).

Claims (1)

(57) [Claims] 1. A sewing machine having a cloth presser lifting mechanism, a control means for controlling the sewing machine, a cloth presser lifting drive device for driving the cloth presser lifting mechanism, and an input means operated by an operator. The cloth presser lifting drive device outputs a relatively high first level voltage in response to a command from the input means, and outputs a relatively low second level voltage in response to a command from the control means after the first level voltage is output for a predetermined time. Sewing machine drive device.