JPH0117257Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] A plurality of open/close switches including a switch for selecting a desired pattern from among a variety of patterns, and for at least one of commanding a desired operation and detecting an operating state. and a display device having seven display elements for each digit in order to display the selected pattern using a corresponding number of at least one digit, and a switching means to select either the sewing mode or the test mode. Regarding the electronic sewing machine that I chose.

[Prior Art] Conventionally, in this type of electronic sewing machine, a large number of open/close switches are installed in the sewing machine frame for instructing desired sewing operations and detecting the operation status, and these open/close switches are connected to each other. The central processing circuit detects the state of the open/close switch and automatically controls various sewing machine operations, dramatically improving the ease of use of the sewing machine.

However, in order to check whether the on/off switches are normal or malfunctioning before shipping the sewing machine, the operator removes the sewing machine frame and directly measures the terminal voltage of each of the many on/off switches using a special inspection instrument such as a voltmeter. This required measurement, which was extremely troublesome and time-consuming, and caused problems in terms of sewing machine inspection efficiency.

[Purpose] The purpose of the present invention is to make it possible to inspect whether a large number of open/close switches are normal or malfunctioning simply by operating each of the many open/close switches without having to remove the sewing machine frame; An object of the present invention is to provide an electronic sewing machine that can efficiently display test results of a switch.

[Solution] The present invention provides a plurality of open/close switches for at least one of operation command and operation detection for each of the seven display elements for displaying each digit of the corresponding number of the pattern in the sewing mode. correspond,
an inspection means operating in a test mode to inspect whether each of the open/close switches is normal or malfunctioning; and an inspection means operating in a test mode to display the inspection result on the display element corresponding to the inspected open/close switch. and control means.

[Operation] In the sewing mode, the present invention displays each digit of the corresponding number of the selected pattern on seven display elements, and in the test mode, each open/close switch is inspected, and the display element corresponding to the open/close switch is displayed. and visually display the inspection results.

[Embodiment] The details of an embodiment of the present invention will be described below with reference to the drawings.

In the figure, a display board 11 on which many pattern figures (not shown) are posted is fixed to the front of a frame 10 of the sewing machine, and each figure on this display board 11 has a two-digit pattern number. Each is attached.

Further, on the front surface of the frame 10, there are ten number keys 12 as switches for selecting a desired pattern from among a variety of patterns, and a start/stop switch 1 as an open/close switch for commanding a desired operation.
3. A reverse stitch switch 14, a combination switch 15, a readout switch 16, and a feed dog depression position detection switch (not shown) is installed inside the frame 10 as one of the open/close switches for detecting the operating state. There is. The frame 10 includes a two-digit 7 that visually displays the pattern number of the selected pattern.
A segment LED 17 is installed, a needle bar 18 is placed at the head of the upper arm of this frame 10, and a feed dog 19 is installed in the bed of the needle bar 18.

A changeover switch 20 is provided inside the frame 10.
is installed and can be switched through a small hole 21 bored in the side of the frame 10, and this switch 20 always outputs a low level signal (hereinafter referred to as an "L" signal). , is configured to output a high level signal (hereinafter referred to as an "H" signal) when pressed, and continue to output the "H" signal until it is pressed again.

Next, the electrical configuration will be explained.

The changeover switch 20 outputs "H" as the changeover signal CS.
Either the signal or the "L" signal is output to one input terminal of the AND gate 25 and to a sewing mode controller 40, which will be described later. An end detection signal ES from an end detection circuit 38, which will be described later, is input to the other input terminal of the AND gate 25. This end detection signal ES is always an "H" signal,
The AND gate 25 passes the "H" switching signal CS and inputs the signal CS to the terminal T1 of the test mode controller 26. This test mode controller 26 is enabled when an "H" signal is input to its terminal T1.

The scanning circuit 27 as an inspection means includes a total of eight start/stop switches 13 as on/off switches;
A reverse stitch switch 14, a combination switch 15, a readout switch 16, and a feed dog depression position detection switch are connected to each other. The scanning circuit 27 also receives a scanning signal from the test mode controller 26.
SD is input. The scanning signal SD is composed of an 8-bit signal, and each bit signal corresponds to each of the on/off switches. The scanning circuit 27 selects only one of the opening/closing switches based on the scanning signal SD, and if that switch is in the open state, supplies an "H" signal as the opening signal OP to the terminal T2 of the test mode controller 26,
If it is in the closed state, it is configured to supply an "H" signal to the terminal T3 as the closing signal CL.

When the test mode controller 26 is enabled, only one bit of the scanning signal SD becomes "H".
After converting this scanning signal SD into a signal, the scanning circuit 27
and sequentially select the switches to be scanned. The controller 26 detects the signals OP, CL corresponding to the state of the selected switch, supplies write signals to a memory 28 (described later), and stores these signals OP, CL.
After the detection operation of storing CL and this series of detection operations are completed, the read signal is transferred to the memory 28.
and controlling the memory 28 so that the memory 28 supplies the stored contents of each address to a discriminating circuit 30, which will be described later, according to the order of the detected switches. has been done.

The auto-clear type memory 28 is composed of a known random access memory and has an address corresponding to each of the on/off switches. The two storage units included in this address store an open signal OP and a close signal CL corresponding to each of the switches. In this memory 28, the test mode controller 26
An opening signal OP and a closing signal CL of the selected switch are respectively stored in two storage sections at addresses designated by an address signal outputted from an address memory 29 (described later) in response to a scanning signal SD of the switch. In response to a read signal from the controller 26, the contents of the two storage sections at the designated addresses are supplied to a determination circuit 30, which will be described later.

The address memory 29 stores address signals corresponding to each of the on/off switches,
When the scanning signal SD from the controller 26 is input, an address signal corresponding to the switch selected by the scanning signal SD is supplied to the memory 28.

The discrimination circuit 30 discriminates the contents of the two storage sections supplied from the memory 28, and outputs the open signal OP.
When the closing signal CL and the closing signal CL are both stored, an "H" signal is supplied to one input terminal of the control circuit 31 and the AND gate 37 as the normality determination signal NS. On the other hand, when at least one of the open signal OP and the close signal CL is not stored, an "L" signal is sent to the control circuit 35 as the failure determination signal TS.
and one input terminal of the AND gate 37.

The control circuit 31 receives the normality determination signal NS or failure determination signal TS and the scanning signal SD, and controls the segment a of each of the seven segment LEDs 17.
Multiplexer 3 sends signals that control the flashing of h to h.
2 to the display drive circuit 33, respectively. The signals NS and TS regarding each open/close switch from the discrimination circuit 30 are supplied to one of the segments a to h through one of a number of AND gates (not shown) inside the control circuit 31. The scanning signal SD controls opening and closing of the AND gate. Therefore, only one AND gate is opened, and the normality determination signal NS becomes "H".
An "L" signal as a signal or failure determination signal TS is outputted to one segment via the display drive circuit 33. On the other hand, the display drive circuit 33
All other signals output to are "L" signals.

A signal from the control circuit 31 and a signal from a decoder 44 (described later) are input to the multiplexer 32, and when the switching signal CS is an "H" signal, the signal from the control circuit 31 is selected and displayed. is supplied to the device drive circuit 33. On the other hand, when the signal is "L", the signal from the decoder 44 is selected and supplied to the display drive circuit 33. the controller 26
The control circuit 31 and multiplexer 32 constitute a control means.

The display drive circuit 33 is the 7-segment LED
When the signal corresponding to each segment a to h of 17 is an “H” signal, that segment is lit;
It is configured to turn off the light when the signal is "L".

The 8-bit signals of the scanning signal SD are each supplied to a NAND gate 36, and the output signal from the NAND gate 36 is input to the other input terminal of the AND gate 37. When the output signal of this NAND gate 36 is an "H" signal, the AND gate 37
is opened and the signal NS or TS from the discrimination circuit 30 is supplied to the end detection circuit 38.

The end detection circuit 38 includes an auto-clear type memory section (not shown) for each of the on/off switches.
and is configured to perform the following two functions, the first of which is to designate a storage section using the scanning signal SD and store the normality determination signal NS or failure determination signal TS. . Second
The function is to send the normality determination signal to all of the storage units.
It is determined whether NS is stored or not, and if it is not stored in at least one storage section, the "H" signal is continued to be supplied to the AND gate 25 as it is, the test mode controller 26 is enabled, and all of the NS is stored. When the end detection signal ES is “L”
A signal is provided to the AND gate 25 to disable the test mode controller 26. on the other hand,
This end detection signal ES is supplied to the buzzer 39 to generate an end indicating sound.

Next, a known sewing mode controller 40 will be explained.

The sewing mode controller 40 has its terminal P1
is enabled by inputting the "L" signal to
2, and is also connected as an open/close switch to a start/stop switch 13, a reverse stitch switch 14, a combination switch 15, a readout switch 16, a feed dog depression position detection switch, etc. On the other hand, the output section is connected to the multiplexer 32 via the decoder 44.
It is connected to the stitch data generator 45 as well as to the stitch data generator 45 .

The encoder 41 is configured to convert the pattern number from the numeric key 12 scanned to select a desired pattern into a pattern code signal and supply it to the controller 40, and the decoder 44 converts the pattern number output from the controller 40 into a pattern code signal and supplies the pattern code signal to the controller 40. The pattern code signal is converted back into a pattern number and supplied to the multiplexer 32.

Based on the pattern code signal output from the controller 40, the stitch data generator 45
The pattern data of a desired pattern is selected from the pattern ROM (not shown) and sequentially supplied to the actuator drive circuit 46 as the main shaft rotates.
The needle swing actuator 47 and the feed amount adjustment actuator 48 are operated based on the supplied pattern data.
The structure is such that a desired pattern is formed by controlling the drive of the pattern.

The sewing mode controller 40 stores the pattern code signal inputted from the encoder 41, and when the number key 12 is operated again after the combination switch 15 is closed, another pattern code signal is stored. Further, when the readout switch 16 is closed, the controller 40 sequentially outputs the stored pattern code signals, and the 7-segment LED 1
At 7, the pattern number is visually displayed. When the start/stop switch 13 is closed, the controller 40 alternately outputs a start command signal or a stop command signal for a sewing machine motor (not shown), and also outputs pattern code signals to the stitch data generator 45 in the order in which they are stored. to control the formation of the combination pattern. On the other hand, while the reverse stitch switch 14 is closed, the controller 40
It is also configured to output reverse stitch data to a stitch data generator 45.

Next, its operation will be explained with reference to FIGS. 1 and 3.

First, the user turns on the power and selects switch 2.
When 0 is pressed, an "H" signal is supplied from the changeover switch 20 to the AND gate 25, and this AND gate 25 is opened. The "H" signal from the end detection circuit 38 passes through the AND gate 25 and is supplied to the test mode controller 26, and the controller 26 is enabled. Multiplexer 32 supplies the signal from control circuit 31 to display drive circuit 33 .

When the test mode controller 26 is enabled, it supplies the scanning signal SD with all 8 bits being "H" signals, and stores the open signal OP and the close signal CL, which are "H" signals, in the corresponding address of the memory 28. . At this time, the NAND gate 36 supplies the "L" signal to the AND gate 37, so the AND gate 37 is closed, and the end detection circuit 38 is disabled and continues to supply the "H" signal to the AND gate 25.

Next, the controller 26 supplies the read signal to the memory 28, and the determination circuit 30 supplies the normality determination signal NS to the control circuit 31. The control circuit 31 controls the 7-segment LED based on the scanning signal SD.
A normality determination signal NS is supplied to all 17 segments a to h through the display drive circuit 33, and all segments a to h are turned on.

After a certain period of time has elapsed, the controller 26 supplies the scanning signal SD of all 8 bits as "H" signals, and stores the open signal OP and the close signal CL of "L" signals in the corresponding addresses of the memory 28. Next, the controller 26 supplies a read signal to the memory 28, and the determination circuit 30 supplies a failure determination signal TS to the control circuit 31 based on the signal from the memory 28. Based on the scanning signal SD, the control circuit 31 supplies a failure determination signal TS to all segments a to h of the 7-segment LED 17 via the display drive circuit 33, and all segments are turned off. Through the above operations, the failure of the 7-segment LED 17 is recognized.

Next, the controller 26 first supplies a scanning signal SD with only the bit corresponding to the start/stop switch 13 set to an "H" signal to the scanning circuit 27, the address memory 29, and the NAND gate 36. scanning signal
By SD, the address memory 29 specifies the address corresponding to the start/stop switch 13 in the memory 28, and the NAND gate 36 supplies an "H" signal to the AND gate 37.
to be opened. The scanning circuit 27 detects only the state of the start/stop switch 13 based on the scanning signal SD. At this time, if the user has operated the switch 13 to close it, a close signal CL is generated, and if the user has not operated anything, an open signal OP is generated. The controller 26 detects one of the signals CL and OP and stores it at a designated address in the memory 28.

Thereafter, the controller 26 supplies the scanning signal SD with only the corresponding bit set to the "H" signal to the reverse stitch switch 14, and stores the signal OP or the signal CL in the corresponding address of the memory 28. In this manner, the controller 26 performs the operations described above up to the feed dog depression position detection switch.

Next, the controller 26 again supplies the scanning signal SD with only the bit corresponding to the start/stop switch 13 set to the "H" signal to the address memory 29, specifies the address corresponding to the start/stop switch 13 in the memory 28, and also specifies the address corresponding to the start/stop switch 13 in the memory 28. A read signal is supplied to the memory 28. As a result, the contents of the designated address are supplied to the determination circuit 30. The discrimination circuit 30 supplies a normality discrimination signal NS to the completion detection circuit 38 via the control circuit 31 and the AND gate 37 when the partner of the open signal OP and the close signal CL is stored at that address. On the other hand, when at least one of the open signal OP and the close signal CL is not stored, a failure determination signal TS is supplied to the control circuit 31 and the end detection circuit 38. The control circuit 31 is a scanning signal
Based on SD, the segment a corresponding to the start/stop switch 13 is designated, and if the signal from the discrimination circuit 30 is the normality discrimination signal NS, the segment a is turned on, and if the signal from the discrimination circuit 30 is the failure discrimination signal TS, it is turned off. The end detection circuit 38 stores a normality determination signal NS and a failure determination signal TS in the storage section corresponding to the start/stop switch 13.
Memorize one of the following. Thereafter, the controller 26 supplies the address memory 29, the control circuit 31, and the end detection circuit 38 with a scanning signal SD in which only the bit corresponding to the reverse stitch switch 14 is set to the "H" signal. At this time, the control circuit 31 turns on or off the segment b corresponding to the reverse stitch switch 14 in the same way as in the case described above, and the end detection circuit 38 sends a normality determination signal to the storage section corresponding to the reverse stitch switch.
Either NS or failure determination signal TS is stored. The controller 26 sequentially performs the above operations up to the feed dog sinking position detection switch, and then the completion detection circuit 38 checks whether the normality determination signal NS is stored in all the storage units corresponding to all the open/close switches. is determined, and if the signal NS is not stored in at least one storage section, it is "H".
The signal continues to be supplied to the AND gate 25, and the controller 26 again supplies the scanning signal SD to repeat the detection operation. On the other hand, a normality determination signal is sent to all storage units.
When NS is stored, the end detection circuit 38 supplies an "L" signal as the end detection signal ES to the AND gate 25 to disable the controller 26, and also activates the buzzer 39 to generate the end sound. inform the workers.

Generally, a switch has two states: an open state and a closed state.
A faulty switch has two states:
Regardless of its operation, it can only be in either an open state or a closed state. Therefore, only one of the open signal OP and the close signal CL is stored at the address in the memory 28 that corresponds to the failed switch. Therefore, in conjunction with the read operation of the controller 26, the discrimination circuit 30 outputs only the failure discrimination signal TS for the failed switch, and the corresponding segment is not lit.

Therefore, since the controller 26 quickly repeats the operation of the switch and the blinking control of the corresponding segment, the user perceives that the segment corresponding to the switch determined to be normal is lit continuously, indicating that the switch has failed. The switch can be visually recognized.

Next, when the user presses the changeover switch 20 again, an "L" signal is supplied from the changeover switch 20 to the AND gate 25 and the sewing mode controller 40. As a result, the AND gate 25 is closed, the test mode controller 26 is disabled, and at the same time, the sewing mode controller 40 is enabled, and the multiplexer 32 outputs a signal representing the pattern number from the decoder 44 to the display drive circuit 33. It becomes like this.

In order to form a desired pattern displayed on the display board 11, the user inputs the pattern number assigned to the pattern using the number keys 12. The input pattern number is converted into a pattern code signal by the encoder 41. Sewing mode controller 40 stores this pattern code signal and supplies it to decoder 44 and stitch data generator 45. The decoder 44 converts this pattern code signal into a pattern number and displays it on the 7-segment LED 17. The user is
In order to form a combination of the currently stored pattern and another pattern, the pattern number may be input again after pressing the combination switch 15. Further, the user presses the readout switch 16 in order to confirm the pattern stored in the controller 40. As a result, the pattern numbers of the stored patterns are displayed on the 7-segment LED 17 in accordance with the stored order. When the user presses the start/stop switch 13 after setting the work cloth on the sewing machine, the sewing machine is started and a pattern code signal is first supplied to the stitch data generator 45. Stitch data generator 45
supplies stitch data from the pattern ROM to the actuator drive circuit 46 as the main shaft rotates. The actuator drive circuit 46 controls the swing amount of the needle bar 18 and the feed amount of the feed dog 19 by driving the needle swing actuator 47 and the feed amount adjustment actuator 48 in accordance with the stitch data. This forms the desired pattern.

[Effect] The present invention provides a display device having seven display elements for each digit of a corresponding number of a desired pattern in the sewing mode in a sewing machine that can be selectively switched to either the sewing mode or the test mode. The number is visually displayed, and the open/close state of each of the plurality of open/close switches for at least one of operation command and operation detection is inspected in the test mode, and the result is displayed on the display element corresponding to each of the switches. Since it is configured as
There is no need to newly install a special display device for the test mode in the limited space of the sewing machine. Furthermore, simply by operating each of the plurality of open/close switches, the test results are displayed on each of the display elements,
There is an advantage that the inspection and display of the plurality of on-off switches can be performed efficiently.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment embodying the present invention, Fig. 2 is a flowchart showing the operation of the part surrounded by broken lines in Fig. 1, and Fig. 3 is a front view of the sewing machine of this embodiment. , FIG. 4 is an enlarged view of the display device. In the figure, 12 is a number key, 13 to 16 are open/close switches, 17 is a 7-segment LED, 21 is an off switch, 26 to 30 are inspection means, and 26, 31, and 32 are control means.

Claims (1)

[Claims for Utility Model Registration] A plurality of open/close switches, including a switch for selecting a desired pattern from among a variety of patterns, for at least one of instructing a desired operation and detecting an operating state; In order to display the selected pattern using at least one corresponding number, the display device has seven display elements for each digit, and the switching means selects either the sewing mode or the test mode. In the electronic sewing machine, the display element of the display device is provided corresponding to each of the open/close switches, and is enabled in the test mode to confirm the normality of each of the multiple open/close switches. and inspection means for inspecting a failure; specifying a display element corresponding to a switch enabled in the test mode and inspected by the inspection means; and specifying a display element corresponding to a switch that is enabled in the test mode and inspected by the inspection means, and detecting the specified display element according to the inspection result of the inspection means. and control means for supplying a signal for controlling blinking of the switch to the display device, the electronic sewing machine having a test function for the switch.