JPH0733744Y2 - Sewing machine display controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sewing machine which controls the operations of a stitch forming device and a cloth feeding device based on numerical data such as a seam allowance and the number of stitches. The present invention relates to the display control device.

[Conventional technology]

Conventionally, in this type of sewing machine, a plurality of keys for inputting numerical data such as a sewing allowance and the number of stitches required for program sewing, and a display device for displaying the numerical data are arranged on an operation panel. By operating the first addition key and the subtraction key among the plurality of keys, the displayed numerical value is increased / decreased for each first unit amount, and by operating the second addition key, The displayed value increases with each large second unit amount.

[Problems to be solved by the device]

However, in the conventional sewing machine, since the display changing speed of the display device based on the operation of each key is kept constant, when the display numerical value is greatly increased or decreased, each key is pressed and held for a long time. It becomes necessary to select or use the first and second addition keys, and the work becomes complicated.

The present invention has been made to solve the above problems, and its purpose is to increase the display change speed of the display device according to the operation time of the operation means for inputting numerical data. It is an object of the present invention to provide a display control device for a sewing machine that can be operated easily and quickly.

〔Example〕

An embodiment embodying the present invention will be described in detail below with reference to the drawings. As shown in FIG. 2, a needle bar 2 having a needle 2a constituting a stitch forming device is vertically movably attached to an arm portion 1 of the sewing machine, and the needle bar 2 is rotated as the main shaft of the sewing machine rotates.
When 2a is moved up and down and a thread catcher (not shown) in the bed portion 3 is operated, a stitch is formed on the work cloth by the cooperation of both. The bed 3 is provided with feed dogs 4 constituting a cloth feed device, and the feed dogs 4 are actuated in accordance with the rotation of the main shaft of the sewing machine to feed the work cloth.

An operating device 5 is mounted on the upper part of the arm 1, and an increment key 6 and a decrement key 7 as operating means are provided on the front surface of the operating device 5 as shown in FIG. Numerical data such as the seam allowance and the number of stitches are input based on the. A liquid crystal display device 8 for displaying the numerical data is mounted on the front surface of the operation device 5.

A cloth edge detector 9 composed of a light emitting element and a light receiving element is mounted on the front surface of the arm portion 1 so as to be located on the cloth feeding side with respect to the needle drop point. The light is reflected by the work cloth passing over 3 and is input to the light receiving element, and the end of the work cloth is detected based on the amount of light received. A needle is provided in the arm section 1 based on the rotation of the sewing machine main shaft.
A known needle position detector 10 for detecting the position of 2a is provided.

Further, as shown in FIG. 1, the control device in the sewing machine of this embodiment is provided with a CPU 11 as a first and second display control device, and the CPU 11 has a sewing input input by operating the keys 6 and 7. RAM12 that stores numerical data such as allowance and number of stitches,
It is connected to the ROM 13 which stores programs for cloth edge detection sewing based on the set sewing allowance and the set number of stitches and sewing of the set number of stitches. A reference clock generator 14 is connected to the CPU 11, and the CPU 11 counts the pressing operation time of each key 6, 7 based on the clock signal input from the reference clock generator 14.

Further, the ROM 13 stores a display control program corresponding to the pressing operation time of each key 6 and 7, and the CPU 11 displays the initial setting numerical value on the display device 8 via the display drive circuit 8a based on the display control program. When the increment key 6 is operated in that state, the display data is additionally displayed for each change unit amount δ, and when the decrement key 7 is operated,
The display data is subtracted and displayed for each change unit amount δ. Also, CPU1
1 indicates that the numerical value changing speed on the display device 8 is set to "A" when the pressing operation time of each of the keys 6 and 7 is within a predetermined time (switching time) described later, and is set to "B" when the predetermined time is exceeded. Set. Here, B ≧ A. The numerical value changing speeds "A" and "B" represent time intervals at which the CPU 11 updates the numerical value displayed on the display device 8. Furthermore, this time interval is CP
U11 is represented as a count value that counts the clock signals from the reference clock generator 14.

Further, an operation pedal 15 is connected to the CPU 11, and based on the front stepping operation, the CPU 11 controls the drive of the sewing machine motor 16 via a motor drive circuit 16a to rotate the sewing machine main shaft.

Now, in the sewing machine configured as described above, the sewing allowance key (not shown) or the number of stitches key (not shown) on the operating device 5 is used.
When the cloth edge detection sewing mode or the number of stitches sewing mode is set by the operation of, the CPU 11 displays the initial set value on the display device 8 in step S1 in FIG.
The set value change count n is set to "0". Therefore, when each of the keys 6 and 7 is operated, the CPU 11 adds or subtracts the initial set value by the unit amount δ in accordance with the operated key (S
3). When the set value change count n is "4" or less, the determination in S4 is NO, and the program proceeds to S5.

Here, the CPU 11 changes the numerical data N by the change unit amount δ based on the slower display change speed “A”, and displays the numerical value on the display device 8 (S6, S7). That is, the CPU 11
After counting the clock signals by the count value based on the display change speed "A", the display value of the display device 8 is updated. In this embodiment, when the cloth edge detecting sewing mode and the stitch number sewing mode are set, the changing unit amount δ of the numerical data N is set to “0.1 mm” and “1”, respectively. Then, after the displayed numerical value is once changed, in S8, it is determined whether or not the operation of each of the keys 6 and 7 is stopped, and if the result is YES, the input numerical value data is input. N is determined.

On the other hand, when the determination in S8 is NO, that is, when the keys 6 and 7 are continuously pressed even after the numerical value is changed, the program returns to S3 and the set value change number n is incremented. When the number of changes n becomes 4 or more, CP
U11 sets a fast display change speed B, changes the numerical data N for each change unit amount δ according to the speed B, and displays it on the display device 8 (S9, S6, S7).

That is, while the number of changes n is up to 3, that is, during the time (switching time) represented by the change speed (time interval) A × 3, the change speed is changed to “B” by operating the keys 6 and 7. The setting is changed to.

Therefore, in this embodiment, the display change speed of the display device 8 can be increased according to the operation time of each key 6, 7.
Numerical value input operation can be performed easily and quickly.

When the operating pedal 15 is depressed further after setting the seam allowance, the CPU 11 causes the motor 16 to operate via the motor drive circuit 16a.
The sewing machine is operated by driving. Also, CPU11
Calculates the number of stitches to be executed after the cloth edge is detected based on the distance L between the needle drop point and the cloth edge detection position, the sewing margin data and the feed pitch. Then, when the cloth edge detection signal is input from the cloth edge detector 9 in accordance with the operation of the sewing machine, the CPU 11 responds to the cloth edge detection signal, and based on the needle position detection signal from the needle position detector 10, The counting of the number of stitches is started, the sewing machine is sewn for the number of stitches previously calculated, and then the motor 16 is stopped.

On the other hand, after setting the number of stitches by operating each of the keys 6 and 7, when the operation pedal 15 is stepped forward, the CPU 11 drives the motor 16 to operate the sewing machine, and the needle position from the needle position detector 10 is detected. After the number of stitches is counted based on the detection signal and the sewing is performed for the number of stitches set in advance, the motor 16 is stopped and the sewing operation is ended.

[Effect of device]

As described in detail above, the present invention is advantageous in that the display change speed of the display device can be increased according to the operation time of the operation means for inputting numerical data, and the numerical input operation can be performed easily and quickly. Exert the effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a sewing machine controller embodying the present invention, FIG. 2 is a side view of the sewing machine, and FIG. 3 is a flowchart. 2a: a needle that constitutes a stitch forming device, 4 ... a feed dog that constitutes a cloth feeding device, 6 ... an increment key as an operating means, 7 ... a decrement key as an operating means,
8 ... Display device, 11 ... CPU as first and second display control device, N ... Numerical data, A, B ... Display change speed, δ ...
… Change unit amount.

Claims (1)

[Scope of utility model registration request] 1. A sewing machine configured to control the operations of a stitch forming device (2a) and a cloth feeding device (4) based on numerical data (N) such as a seam allowance and the number of stitches. ) Is pressed when inputting), a display device (8) for displaying the numerical data (N), and a plurality of operation units (6, 7) are operated according to the operating time. The first display control device (11) that selectively sets one display change speed (A, B) from the display change speeds (A, B), and the first display control device (11) A display control device for a sewing machine, comprising: a second display control device (11) for updating the numerical data (N) for each predetermined amount (δ) according to the display change speed (A, B).