JPH0122620Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a sewing machine equipped with a removable memory cassette, and when switched to a state in which a pattern is formed according to stitch information stored in the memory cassette, This invention relates to a technique for optically displaying that the memory cassette is securely installed.

Prior Art A type of sewing machine is equipped with a first pattern memory provided in the sewing machine frame and a second pattern memory storing a pattern different from the pattern stored in the first pattern memory. a memory cassette that is removable from the frame;
Some types of sewing machines are equipped with a changeover switch that can be operated to switch to one of the two pattern memories, and form a pattern according to stitch information stored in one of the two pattern memories. According to this type of sewing machine,
By selecting a memory cassette that stores a desired pattern and attaching it to the sewing machine frame, the selection range of patterns that can be sewn by the sewing machine can be expanded as needed. If the switching operation to the first pattern memory or the loading of the memory cassette itself is incomplete, another pattern in the first pattern memory may be sewn by mistake.

Purpose of the invention The present invention was developed against the background of the above circumstances, and its purpose is to ensure that the switching operation to the pattern memory built into the memory cassette and the installation of the memory cassette itself are carried out appropriately. Our goal is to provide a sewing machine that can display the following information.

Structure of the Invention In order to achieve the above object, the gist of the present invention consists of (1) a detection device that detects attachment of the memory cassette to the sewing machine frame and generates an attachment detection signal; (2) By operating the changeover switch, the second
(3) an optical display element for displaying the selection state of the second pattern memory; (4) the attachment detection signal and the selection signal; supplying a continuous lighting signal to the optical display element when both are occurring;
activating means for providing a blinking signal to the optical display element in response to operation of the selector switch when the mounting signal is not being generated.

Effects of the invention With this arrangement, the generation means detects the operation of the changeover switch to the second pattern memory built in the memory cassette and generates a selection signal, and the detection device detects the operation of the changeover switch to the second pattern memory built in the memory cassette. While mounting on the frame is detected and a mounting detection signal is generated, the optical display element is actuated by the actuating means while the selection signal and the mounting detection signal are both being generated. That is, when the memory cassette is not yet fully installed, the optical display element is in a blinking state, but when the switch is operated to the second pattern memory side and the memory cassette is completely installed in the sewing machine frame. Since the optical display element is in a continuous lighting state, it can be confirmed from the display of the optical display element that the changeover switch has been operated and the memory cassette has been properly inserted. Therefore, the operator can reliably sew the desired pattern by starting the sewing machine after confirming the display on the optical display element.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, the base portion 10 includes a pillar portion 12.
is erected, and an upper arm portion 16 having a head portion 14 at one end is horizontally supported by the pillar portion 12 in a cantilevered manner. At the bottom of the head 14, there is a needle bar 18 that is reciprocated in the vertical direction in synchronization with the rotation of a sewing machine main shaft (not shown), and a presser foot 2 that is operated to a raised position or a lowered position by an operator's operation.
0, and a feed dog 22 is provided near the needle drop point on the bed portion 10. The feed dog 22 and needle bar 18 are configured so that the work cloth feed direction, feed amount, and needle vibration position can be changed by a feed actuator 96 and a needle position actuator 94, which will be described later. A sewing needle fixed to the rod 18 cooperates to form a desired pattern on the work cloth.

On the front surface of the upper arm portion 16, a large number of sets of figures corresponding to patterns that can be sewn are displayed together with pattern numbers. A movable display board and a fixed display board on which the above-mentioned shapes and pattern numbers are posted are arranged in the display section 24, and when the movable display board is moved by a switching lever 26, which will be described later, The rear fixed display board is exposed at the front.

An operating section 28, which is shown in detail in FIG. 2, is provided on the front surface of the pillar section 12. The operating section 28 is provided with a switching lever 26 for switching the display board in the display section 24, and below the switching lever 26 is provided a two-digit numerical display 30 for displaying the pattern number. There is. Twelve pattern selection keys 32 are arranged below the number display 30, each displaying numbers "0" to "9" and "+" and "C". The pattern to be sewn is specified by inputting the pattern number using the . The pattern selection key 32 on which "+" is displayed is for inputting a combination of multiple types of pattern numbers, and the pattern selection key 32 on which "C" is displayed is for canceling a pattern number that has already been input. It is something.

Two switching operation keys 34 and 36 are arranged on the right side of the pattern selection key 32. The switching operation key 34 is used to select whether to sew the pattern selected by the pattern selection key 32 only once or continuously, and each time the switching operation key 34 is pressed, one cycle of sewing is performed. Continuous sewing is selected alternately. In addition, LED38
indicates a state in which the mode has been switched to continuous sewing by the switching operation key 34. Further, the changeover operation key 36 constitutes the changeover switch, and is a first pattern memory 4 built in the sewing machine.
2 (FIG. 4) or a pattern stored in a second pattern memory 46 built into a memory cassette 44, which will be described later. key 36
The first pattern memory 42 and the second pattern memory 46 are alternately selected for each pressing operation. In addition,
The LED 40 constitutes the optical display element, and the second pattern memory 46 is connected to the switching operation key 3.
6 and is lit up when the memory cassette 44 is normally installed.

Below the pattern selection key 32, a needle position adjustment knob 48, a feed adjustment knob 50, and a sewing machine motor speed adjustment knob 52 are provided.
A switching operation key 54 that enables operation of the needle position adjustment knob 48, an LED 56 that indicates that the operation has been switched to manual operation, and a feed adjustment knob 5
A switching operation key 58 that enables the operation of 0 and an LED 6 that indicates that the operation has been switched to manual operation.
0 is provided for each.

A display window 64 for displaying the label 62 of the memory cassette 44 is provided below the sewing machine motor speed adjustment knob 52. That is, a slot 66 is formed in the lower part of the pillar part 12 and opens on the right side surface thereof, and when the memory cassette 44, which has a flat box shape, is installed in the slot 66 to the proper position, the memory cassette is inserted into the slot 66. 44
A label 62 affixed to the side surface is displayed through a display window 64. Therefore, the memory cassette 4 indicated on the label 62
The contents of item 4 can be easily confirmed by the operator. As shown in detail in FIG.
A limit switch 68 as a detection device operated by the memory cassette 44 is fixedly installed inside. The limit switch 68 is secured to be actuated when the memory cassette 44 is inserted into the mounting position shown in phantom in FIG. The mounting position of the memory cassette 44 is when the connector 70 is fully inserted into the memory cassette 44.
This refers to the state in which they are electrically connected reliably.

The sewing machine constructed as described above is equipped with a circuit shown in FIG. That is, the T-type flip-flop circuit 72 serving as the generating means is alternately inverted between the set state and the reset state in response to an input signal supplied each time the switching operation key 36 is operated, and outputs a selection signal SS representing the set state. and gates 74 and 76, respectively.
On the other hand, the limit switch 68 is connected to the memory cassette 4.
4 is inserted into the normal mounting position, and supplies an "H" level mounting detection signal SK to the AND gate 74 and to the AND gate 76 via the inverter 78. A pulse signal SP of about 1 to several Hz is supplied to the AND gate 76 from an oscillator 80, for example.

The AND gate 74 supplies an external memory selection signal SL for instructing the selection of the second pattern memory 46 built in the memory cassette 44 to the control device 84, and also supplies it to the display drive circuit 88 via the OR gate 86. AND gate 76 also LED38
Flashing signal SF for flashing or gate 8
6 to a display drive circuit 88. The blinking signal SF is a signal synchronized with the pulse signal SP.

When the external memory selection signal SL is not supplied, the control device 84 selects the first pattern memory 42 built into the sewing machine, and selects a group of patterns corresponding to the pattern number input by the pattern selection key 32. The stitch data is sequentially extracted from the first pattern memory 42 in synchronization with the rotation of the main shaft of the sewing machine, and is supplied to the actuator drive device 92. The actuator drive device 92 supplies a drive signal to a needle position actuator 94 and a feed actuator 96 based on individual stitch data supplied in synchronization with the sewing machine main shaft, and controls the needle position of the sewing machine needle and the feed direction of the workpiece cloth. and change the feed amount for each stitch. The needle position actuator 94 drives the needle bar 18 laterally, and the feed actuator 96 drives a feed adjuster that adjusts the feed direction and feed amount of the feed dog in accordance with stitch data. . The switching operation key 34 is included in the control device 84 and the needle position adjustment knob 4
8. The feed adjustment knob 50 and the LEDs 56 and 60 are included in the actuator drive device 92.

The effects of the present invention will be explained below.

When sewing a pattern other than the stitch data stored in the first pattern memory 42 built into the sewing machine, the operator must input the stitch data for sewing the desired pattern. A memory cassette 44 containing a stored second pattern memory 46
is inserted into the slot 66, and the switching operation key 36 is pressed. Therefore, T-type flip-flop circuit 72 is brought into a set state, and selection signal SS is supplied to AND gates 74 and 76. At this time, if the memory cassette 44 is properly installed in the slot 66, the limit switch 68 is activated and the insertion detection signal is output.
SK is supplied to the AND gate 74, and the external memory selection signal SL is supplied from the AND gate 74 to the control device 84, and the LED 40, which is supplied to the display drive circuit 88 via the OR gate 86, is lit continuously. . At this time, the attachment detection signal SK is passed through the inverter 78 to the AND gate 7.
6, the AND gate 76 is closed.

If the memory cassette 44 is not fully installed, the limit switch 68 cannot be activated;
Attachment detection signal SK is not generated. Therefore, while AND gate 74 is closed, AND gate 7
6 is opened, a blinking signal SF synchronized with the pulse signal SP supplied from the oscillator 80 is sent from the AND gate 76 to the display drive circuit 88 via the OR gate 86.
is supplied to cause the LED 40 to blink. this
The flashing state of the LED 40 indicates that the memory cassette 44 is not fully installed. Note that when the switching operation key 36 is not operated and the T-type flip-flop circuit 72 is in the reset state, the selection signal SS is not output, so the AND gates 74 and 76 are always closed and the LED 40 is not lit. That is, AND gate 74,7
6, inverter 78, oscillator 80, OR gate 8
6. The display drive circuit 88 constitutes an operating means for operating the LED 40.

In this way, according to this embodiment, it can be confirmed from the lighting display of the LED 40 that the operation of the switching operation key 36 or the installation of the memory cassette 44 is incomplete. This prevents the sewing machine from being operated with 44 incompletely attached.

Although the embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

For example, the oscillator 80, the inverter 78, the AND gate 74, and the OR gate 86 are removed from the operating means of the above embodiment, and the external memory selection signal output from the AND gate 74 is
SL may be directly supplied to the display drive circuit 88. In short, the actuating means may be of any kind as long as it drives the LED 40 to cause it to light up continuously when both the selection signal SS and the attachment detection signal SK are generated.

Further, instead of the limit switch 68, a circuit may be provided in the memory cassette 44 to short-circuit the pair of terminals of the connector 70, thereby generating the attachment detection signal SK. In short, any detection device is sufficient as long as it detects that the memory cassette 44 is properly installed.

In addition, instead of the switching operation key 36 and the T-type flip-flop circuit 72, the ON position and the
A ratchet type switch or a changeover type switch, etc., which can be switched to an OFF position, may be used. In this case, the ratchet type switch or changeover type switch serves both as a changeover switch and as a generating means.

Further, part or all of the circuit surrounded by the two-dot chain line in FIG. 4 can be constructed by a so-called microcomputer.

It should be noted that what has been described above is merely one embodiment of the present invention, and the present invention may be modified in various ways without departing from its spirit.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a sewing machine to which the present invention is applied. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. 3 is a sectional view showing the slot of the sewing machine of FIG. 1. FIG. 4 is a block diagram showing a circuit provided in the sewing machine of FIG. 1. 36: Switching operation key (switching switch), 42:
First pattern memory, 46: Second pattern memory, 6
8: Limit switch (detection device), 72: T-type flip-flop circuit (generation means), {40:
LED (optical display element), 74, 76: AND gate, 78: Inverter, 80: Oscillator, 86: OR gate, 88: Display drive circuit} (operating means).

Claims (1)

[Claims for Utility Model Registration] A sewing machine having a first pattern memory provided within the frame and a second pattern memory storing a pattern different from the pattern stored in the first pattern memory;
It is equipped with a memory cassette that is removable from the sewing machine frame, and a changeover switch that can be operated to switch from the first pattern memory to the second pattern memory. A sewing machine that forms a pattern according to a set stitch pattern, further comprising: a detection device that detects attachment of the memory cassette to a sewing machine frame and generates an attachment detection signal; generating means for generating a selection signal when the selection signal is selected; an optical display element for displaying the selection state of the second pattern memory; a removable actuating means for supplying a continuous lighting signal to the optical display element and supplying a blinking signal to the optical display element in response to operation of the changeover switch when the attachment detection signal is not occurring; A sewing machine equipped with a memory cassette.