JPH0426494A - Rotating speed controller of sewing machine - Google Patents

Abstract

PURPOSE:To simply execute the confirmation/adjustment of a rotating speed by displaying a rotating speed or a target speed of a sewing machine shaft controlled by a control means by operating an operating part, and also, changing the target speed by deflecting its display contents. CONSTITUTION:A signal from a stepping-in unit 8 is inputted to a controller 6, and used for executing the rotational control of a motor 10 which becomes a driving source of a sewing machine 2. On a display setting device 20, a change key 28 for changing the display contents by a display part 24 is provided, so that a rotating speed and the number of stitches, etc., can be changed by operating this change key 28. In the course of actuation of the sewing machine 2, a real rotating speed VF of an arm shaft is displayed by the display part 24, and also, when a key input of the change key 28 is executed, a target speed VREF is changed in accordance therewith, therefore, in the course of actuation of the sewing machine, the target speed VREF can be changed, while confirming the real rotating speed VF.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rotational speed control device for controlling the rotational speed of a sewing machine.

[Prior art] In a motor-driven sewing machine, the rotation speed of the sewing machine shaft is set in advance for each sewing operation, and when a sewing operation is specified from the outside, the rotation speed of the sewing machine shaft is adjusted to match that sewing operation. The motor is controlled to drive to the corresponding value. Also, with this type of sewing machine, it is necessary to check and reset the rotation speed set for each sewing job.

[Problems to be Solved by the Invention] However, when confirming or resetting the rotational speed, conventional methods (such as generating rotational speeds corresponding to each sewing operation individually, This was done by detecting using a tachometer (type), which required a lot of time and effort to make adjustments.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sewing machine rotation speed control device that allows the rotation speed to be easily checked and adjusted.

[Means for Solving the Problems] That is, the rotational speed control device of the present invention, which has been made to achieve the above object, has a motor that rotationally drives a sewing machine shaft, and a motor that rotationally drives a sewing machine shaft, and a rotational speed control device that controls the actual rotational speed of the sewing machine shaft. a detection means for detecting a target rotational speed of the sewing machine shaft; a storage means for storing a target rotational speed of the sewing machine shaft; and a storage means for reading the target rotational speed stored in the storage means, so that the actual rotational speed of the sewing machine shaft detected by the detection means is the target rotational speed. a control means for controlling the rotation of the motor to achieve the rotational speed, and a display command for the target rotational speed or the actual rotational speed;
and an operation section for inputting a command to change the target speed, a display means for displaying the target rotation speed or the actual rotation speed when a display command is input from the operation section, and a display means for displaying the target rotation speed or the actual rotation speed. When the actual rotation speed is displayed, if a command to change the target rotation speed is input from the operation section,
Display content changing means for changing the target rotation speed or actual rotation speed displayed by the display means, and when the target rotation speed or the actual rotation speed displayed on the display means is changed by the display content changing means. and target rotation speed changing means for changing the target rotation speed stored in the storage means according to the changed target rotation speed or actual rotation speed.

[Operation] In the rotational speed control device of the present invention configured as described above, the control means controls the rotation of the motor so that the actual rotational speed of the sewing machine shaft becomes the target rotational speed stored in the storage means. Further, when a command to display the target rotational speed or the actual rotational speed is input via the operation section, the display means displays the target rotational speed or the actual rotational speed. Further, when the target rotation speed or the actual rotation speed is displayed on the display means, when a command to change the target rotation speed is input from the operation section, the display content changing means changes the target rotation speed or the actual rotation speed displayed by the display means. While changing the actual rotational speed, the target rotational speed changing means changes the target rotational speed stored in the storage means according to the changed target rotational speed or actual rotational speed.

That is, the rotational speed control device of the present invention displays the rotational speed or target speed of the sewing machine shaft controlled by the control means by operating the operating section, and further displays the target speed by changing the displayed content. Allowed to be changed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 2 is an external view of a sewing machine 2 to which the present invention is applied.

As shown in the figure, a footboard 4 is provided below the sewing machine 2. The treadle 4 is connected to a treadle unit 8 provided inside the control device 6, and when the treadle 4 is stepped forward, the treadle unit 8 generates an activation signal and a depression command. A signal from the treadle unit 8 is input to the control device 6 and is used to control the rotation of the motor O which is the drive source of the sewing machine 2. The motor]O rotates a lower shaft (not shown) provided in the bed 12, and also rotates an upper shaft (not shown) provided in the arm 8 by rotating the sewing machine pulley [6] via the belt 14. drive

A display setting device 20 is provided on the side arm] 8. As shown in FIG. 3, the display setting device 20 includes sewing mode setting keys 22 and 22 for setting sewing operations. A display section 241 that displays the rotational speed and counting during sewing is provided with a speed selection key 26 that displays the rotational speed during each sewing operation.
For example, when the inching speed selection key 26a is operated, the inching speed is displayed on the display section 24. In addition, the display setting device 20 (friend display section 24
A change key 28 is provided for changing the displayed contents.By operating this change key 28, the rotation speed, the number of stitches, etc. can be changed. Furthermore, sewing mode setting key 2
2 and the speed selection key 26 are provided with a display lamp 30. By lighting the display lamp 30, it is possible to notify the key corresponding to the display content on the display section 24.

As shown in FIG. 4, there is also a needle position sensor 32 in the arm 18 that detects the upper end (needle top) and lower end (needle bottom) of the sewing machine needle, and generates a pulse signal every predetermined rotation angle of the upper shaft. A rotation angle sensor 34 is provided, and detection signals from these sensors 32 and 34 are input to the control device 6 together with a command signal from the pedal unit 8 and a signal from the display setting device 20.

On the control device 201 Inputs signals from each of these parts, as well as the display section 24 of the display setting device 20 and the motor] 0
The input/output portro a outputs a control signal to the motor drive circuit 34 that drives the CPU 6b.

It is composed of a well-known microcomputer mainly consisting of ROM 6c and RAM 6d.

Next, the rotational speed control process, which is the main process related to the present invention executed in the control device 6 configured as described above, will be explained along the flowchart of FIG. 5.

This process is a process that is repeatedly executed after the power is turned on to the control device 6. When the process starts, it is first checked in 5100 whether or not a start signal is output from the tread unit 8 by depressing the tread plate 4. That is, it is determined whether the sewing machine 2 is started or stopped. When the sewing machine 2 is started, the process moves to 5ilo, selects the speed type Vk based on the depression command from the treadle 6, and sets the target speed VREF corresponding to the speed type Vk. Next 51
At 20, it is determined whether or not there is a key force from the change key 28, and if there is a key force from the change key 28, the process moves to 5130; the target speed VREF is changed according to the key force. .

Whether the target speed V REF is changed in 5130 or 51
When it is determined in 20 that there is no key input from the change key 28, the process moves to 5140, and the actual rotation speed VF of the upper shaft is calculated based on the detection signal from the rotation angle sensor 34. Continuation (5150) (Top) This calculated actual rotational speed VF is output to the display setting device 20 to be displayed on the display unit 24, and the process moves to 3160, where the actual rotational speed VF is associated with the current speed type Vk. and stored in the storage device (ie, RAM 6d).

Next, in 3170, the control amount of the motor 10 is calculated based on the deviation between the actual rotation speed VF calculated above and the target rotation speed V REF, and in 3180, a control signal corresponding to this calculated control amount is output to the drive circuit 36. After that, switch to 5too again.

On the other hand, if it is determined at 5100 that the sewing machine 2 is stopped, the process moves to 5190 and it is determined whether or not the speed type Vk to be displayed on the display section 24 is selected by operating the selection key 26. . Then, if the speed type Vk is not selected, the process moves to 5too again, and if the speed type Vk is selected, the process moves to 5200, and the speed type Vk stored in the RAM 6d while the sewing machine 2 is started is changed. The corresponding actual rotational speed VF is read out, and in S210, the readout actual rotational speed VF is output to the display setting device 20 and displayed on the display unit 24.

When the actual rotational speed VF is displayed on the display section 24 in this way,
Next, the process moves to 5220, and it is determined whether or not there is a key force from the change key 28. If there is a key force from the change key 28, the process moves to 5230, and the target speed V is changed according to the key force. After changing REF, move to 5100, and if there is no key input from change key 28, continue to 5.
Move to 100.

In this way, in this embodiment, when the actual rotational speed VF of the upper shaft is displayed on the display section 24 while the sewing machine 2 is being started up, and there is human power on the change key 28, the target speed VRE is changed accordingly.
Since I am trying to change F, while the sewing machine is starting up,
The target speed VREF can be changed while checking the actual rotation speed VF. Furthermore, while the sewing machine is stopped, by operating the selection key 26, the actual rotational speed VF of the desired speed type Vk can be displayed on the display section, and by operating the change key 28 while it is displayed (A target speed VREFt can be changed.As a result, the rotational speed of the sewing machine 2 can be adjusted easily and reliably.

[Effects of the Invention] As detailed above, according to the sewing machine rotational speed control device of the present invention, the rotational speed or target speed of the sewing machine shaft is displayed on the display means, and the target rotational speed can be changed. There is. Therefore, anyone can easily and accurately adjust the rotation speed without having to perform the troublesome adjustment work required in the past.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of the present invention, FIG. 2 is a diagram showing a sewing machine according to an embodiment of the present invention, FIG. 3 is an explanatory diagram showing the configuration of a display setting device, and FIG. FIG. 5 is a block diagram showing the configuration, and a flowchart showing speed control processing executed by the control circuit.

Claims (1)

[Scope of Claims] A motor that rotationally drives a sewing machine shaft, a detection means that detects the actual rotational speed of the sewing machine shaft, a storage means that stores a target rotational speed of the sewing machine shaft, and a target rotation stored in the storage means. a control means for reading the speed and controlling the rotation of the motor so that the actual rotation speed of the sewing machine shaft detected by the detection means becomes the target rotation speed; a display command for the target rotation speed or the actual rotation speed; an operation section for inputting a command to change the target speed; a display means for displaying the target rotation speed or the actual rotation speed when a display command is input from the operation section; display content changing means for changing the target rotation speed or actual rotation speed displayed by the display means when a command to change the target rotation speed is input from the operation unit when the rotation speed is displayed; When the display content changing means changes the target rotational speed or actual rotational speed displayed on the display means, the target rotational speed is stored in the storage means according to the changed target rotational speed or actual rotational speed. A rotation speed control device for a sewing machine, comprising: a target rotation speed changing means for changing the rotation speed; and a rotation speed control device for a sewing machine.