JPH05285283A - Sewing machine - Google Patents

Abstract

PURPOSE:To easily and precisely judge whether a selected pattern is adaptable to an embroidery frame or not by driving the embroidery frame for holding a cloth to be worked to a determined position at the time of switching a sewing machine to an embroidery pattern sewing mode, and detecting an identification plate attached to the embroidery frame by a detecting device. CONSTITUTION:At an embroidery pattern sewing, a worker first successively operates a mode changeover switch 50, a pattern selecting switch 39, and a start/stop switch 40. Then, a CPU 42 preliminarily operates an embroidery frame driving part 46 and a detector driving device 47 on the basis of a plurality of patterns stored in 8 ROM 43 and a selected pattern temporarily stored in a RAM 44 to detect an embroidery frame 21 by a detector 48a. Namely, an indentification part 22 consisting of a through hole 23 and a reflecting plate 24 attached to the embroidery frame 21 is detected to judge whether the embroidery frame 21 is adaptable to the selected pattern or not. The judgment result is displayed on an indicator 49. Then, the CPU 42 operates a stitch forming mechanism 45 according to the adaptation result to conduct 8 desired embroidery pattern sewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery frame discrimination device capable of discriminating several kinds of embroidery frames on a sewing machine.

[0002]

2. Description of the Related Art Conventionally, as a device for discriminating an embroidery frame of this type, a detector for detecting an embroidery frame selected and attached from a plurality of embroidery frames is provided to discriminate which embroidery frame is attached. There is. As a detection device having such a structure, a device such as a micro switch has been conventionally attached to an XY head, while a frame discrimination hole is provided in an embroidery frame support. Further, it is described in JP-A-63-252190. As described above, a resistor having a different value for each embroidery frame type is prepared on the side of the embroidery frame, and an electrode contacting the same resistance is provided on the movable frame side. Which frame type is used from the detected resistance value? There is a device for identifying the like.

However, in the above-mentioned conventional structure, in the case of the device for detecting the type of the embroidery frame by the sensor such as the micro switch, the durability becomes a problem. On the other hand, in the case of a device in which resistors having different resistance values are incorporated in the frame support portion of the embroidery frame, there is a drawback that the detection device becomes complicated.

As a device for solving such a problem,
The device described in Japanese Patent Application Laid-Open No. 3-146758 is disclosed. The embroidery frame used in the device is fixed with a medium in which a unique signal is recorded for each frame type, for example, a bar code having a different pattern for each frame type, and the movable frame has a position facing the medium. At, means are provided for reading the signals stored on the medium, eg a bar code reader.

[0005]

However, even in a device for detecting a bar code or the like, a device having a complicated structure is separately required as a device for detecting the type of the embroidery frame, and therefore the structure is also complicated. There was a drawback.

The present invention has been made to solve the above-mentioned problems, and provides a sewing machine which can determine the type of an embroidery frame with a simple structure by using a detection device for detecting the presence or absence of cloth. It is in.

[0007]

In order to achieve this object, a sewing machine according to claim 1 of the present invention comprises a stitch forming means having a vertically moving needle and needle thread catching means cooperating with the needle. In a sewing machine that includes a detection device that detects the presence or absence of a work cloth near the needle drop point, and a sewing machine that normally controls the stitch forming means in accordance with the detection result of the detection device, a plurality of types of holding work cloth are provided. The embroidery frame, driving means for driving the embroidery frame back and forth, left and right, a detection plate provided on the embroidery frame for discriminating each type of a plurality of types of embroidery frames, and the sewing machine for the normal sewing control. When the mode is switched to the embroidery sewing mode for sewing using the embroidery frame, the type of the embroidery frame is determined by driving the detection plate of the embroidery frame to a position corresponding to the detection device. And a determining means.

The sewing machine according to the second aspect of the present invention displays an error on the display device when the selected pattern is not suitable for the result of discrimination of the embroidery frame.

[0009]

According to the sewing machine of the first aspect of the present invention having the above-described structure, one embroidery frame selected from a plurality of types of embroidery frames and attached is driven forward, backward, leftward and rightward. The switching means switches the sewing machine from the normal sewing control mode to the embroidery sewing mode for sewing using the embroidery frame, and the discrimination means corresponds to the detection device for detecting the presence or absence of the work cloth on the detection plate on the embroidery frame. The type of the embroidery frame is determined by driving it to the position.

Further, according to the sewing machine of the second aspect of the present invention, when the selected pattern is not suitable for the discrimination result of the embroidery frame, an error is displayed on the display device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The sewing machine of this embodiment has not only a cloth edge copying sewing function but also an embroidery pattern sewing function.

First, in FIG. 1, the main body of the sewing machine is a sewing machine bed 2 which has a substantially rectangular box shape, and a sewing machine which is erected from the upper right portion of the sewing machine bed 2 and extends to the upper left portion thereof. It is composed of an arm 3.
The sewing machine arm 3 is provided with various operation switches 4 on the front surface on the left side and a liquid crystal display device 5 on the front surface on the upper side.
Is provided.

The embroidery machine body 6 is attached to the sewing machine bed 2 of the sewing machine body 1 by a connector 7. Below, the embroidery machine body 6 is shown in FIG.
Follow the instructions below.

In FIG. 2, the X drive portion is provided with an X pulse motor 8, an X drive shaft set 9, an X guide shaft 10, an X belt 11, and an X tension pulley 12. The Y drive unit is provided with a Y pulse motor 13, a Y guide shaft 14, and a Y belt 15. Further, a frame support portion 16 is provided on the Y guide shaft 14. By driving the X pulse motor 8, the X drive shaft set 9 is rotationally driven via the gear mechanism,
The belt 11 is driven. Accordingly, the frame support portion 16
It is movable in the X-axis direction along the X-guide shaft 10. In addition, the Y pulse motor 13 is driven to drive the Y belt 15 via the gear mechanism. Accordingly, the frame support portion 16 is movable along the Y guide shaft 14 in the Y axis direction. As a result, the frame support portion 16 is movable in both the X axis and the Y axis and is XY controlled based on the embroidery data. A leaf spring 20 is provided on the frame support portion 16 as shown in FIG. 3, and the embroidery frame 21 is detachably attached by the leaf spring 20.

As shown in FIG. 4, the embroidery frame 21 is provided with an identification section 22 for determining the type of the embroidery frame. The identification portion 22 is composed of a through hole 23 formed in the left front portion of the embroidery frame 21, a detection plate attached to the back surface of the left front portion of the embroidery frame 21, and a reflection plate 24 in this embodiment. Here, the combination of the number and position of the through holes 23 differs depending on the type of the embroidery frame 21.

Now, in the lower left part of the sewing machine arm 3,
A detection device for detecting the presence or absence of the work cloth, which is a light detection device 25 in this embodiment, is provided. This photodetector 25
Is configured to detect the cloth edge by scanning the cloth edge with light, and to detect the type of the embroidery frame 21 by scanning the identification section 22 of the embroidery frame 21 with light. There is. The photodetector 25 will be described below with reference to FIG. Incidentally, the configuration and operation of performing cloth edge copying sewing which is normal sewing using the photodetector 25 are the same as the apparatus described in Japanese Patent Laid-Open No. 2-68093, and therefore detailed description thereof is given. Will be omitted.

In FIG. 5, a substantially U-shaped support frame 26 fixed to the sewing machine arm 3 has two guide shafts 27 extending in parallel between the left and right end plates 26a and 26b.
And 28 are provided. The sensor support member 29 includes a support frame portion 30 and a holding portion 31 provided below the support frame portion 30. The holding unit 31 includes a light projecting element 32.
And a light receiving element 33 are provided.

A receiving groove 3 formed in the upper portion of the support frame portion 30.
The guide shaft 17 is inserted through the shaft 0a, and the guide shaft 18 is inserted through through holes 30b formed in the lower portions of the left and right plate portions of the support frame portion 30. Thereby, the support frame portion 30
That is, the sensor support member 29 is movable in the left-right direction.

Further, the support frame 26 is rotatably provided with a drive shaft 34, which is provided between the left and right end plates 26a and 26b, so as to have a threaded groove formed on the outer periphery thereof. A pulse motor 35 is arranged on the right side surface of the right end plate 26a of the support frame 26. With this pulse motor 35,
The drive shaft 34 is rotationally driven via a gear mechanism 36. The drive shaft 34 is inserted into through holes 30C formed in the upper portions of the left and right plate portions of the support frame portion 30. Here, a mounting bracket 38 having a bearing class 37 fixed to the upper end is screwed to the lower half of the support frame portion 30, and the bearing ball 38 is fitted into the threaded groove of the drive shaft 34. There is. When the drive shaft 34 is rotated by this,
The support frame portion 30, that is, the sensor support member 29 is moved and driven in the left-right direction according to the rotation direction. When the sensor support member 29 moves in the left-right direction, the light projected from the light-projecting element 32 scans the identification portion 22 of the embroidery frame 21 in the left-right direction as shown by a chain double-dashed line in FIG. ..

Next, the electrical configuration of this embodiment will be described with reference to the block diagram of FIG. The pattern selection device 39 is configured to select a desired pattern from a plurality of patterns. The start / stop switch 40 is operable to start and stop the operation of the sewing machine. Mode
The mode changeover switch 41 is configured to switch between the normal sewing control mode of the sewing machine and the embroidery sewing mode in which sewing is performed using the embroidery frame.

The CPU 42 is constructed so as to operate according to a flow chart described later. ROM43 is
A plurality of patterns are stored in advance. The RAM 44 is configured to temporarily store the selected pattern. The seam forming mechanism 45 is configured to be able to sew a plurality of patterns. The embroidery frame drive unit 46 is composed of an X pulse motor 8, a Y pulse motor 13, etc., and can move the embroidery frame back and forth and left and right. The detector driving device 47 uses a pulse mode.
It is composed of a camera 35 and the like, and can move in parallel to the left and right. The detector driving device 47 includes a detector 48, and the detector 48 includes a light projecting element 32 and a light receiving element 33. The display 49 is configured to include the liquid crystal display 5,
It is configured to display the determination result of the embroidery frame.

Next, the operation of this embodiment will be described below according to the flow chart shown in FIG.

When sewing the embroidery pattern, the operator operates the mode changeover switch 41 to switch to the embroidery sewing mode.
Then, the CPU 42 determines in S1 that the mode has been switched to the embroidery sewing mode. Next, the operator selects one from the plurality of embroidery frames and attaches it to the support portion. Next, when determining that the pattern is selected in S2, the CPU 42 stores the pattern selected in S3. Then, the operator operates the start switch. Then, the CPU 42 moves the embroidery frame to the detection position in S5 before starting the operation.

Then, the CPU 42 discriminates the embroidery frame in S6 by scanning the identification section 22 of the embroidery frame 21 with light by the light detecting device 25, and in S7, the embroidery frame 21 is suitable for the selected embroidery pattern sewing. Check whether it is a good one.

In this case, the CPU 42 controls the pulse motor 3
5 to drive the drive shaft 34 to rotate the sensor support member 2
9 and the light emitting element 32 and the light receiving element 33 of the holding unit 31.
Is moved from left to right in FIG. 5, for example. As a result, the identification portion 22 of the embroidery frame 21 is scanned by the light emitted from the light emitting element 32. Specifically, the light entering the through hole 23 of the embroidery frame 21 is reflected by the reflecting plate 24 at the bottom of the through hole 23, and the reflected light is received by the light receiving element 33.
The light that hits the portion of the embroidery frame 21 other than the through hole 33 is diffusely reflected, and the reflected light is not received by the light receiving element 33.

Therefore, the light receiving element 33 outputs a detection signal whose output level changes in accordance with the number and position of the through holes 23 of the embroidery frame 21. Based on this detection signal, the type of the embroidery frame 21 currently attached to the embroidery frame support portion 16 is detected. As a result, the CPU 42 causes the embroidery frame 21
If the type is suitable for the selected embroidery pattern, S
Start operation by 8.

On the other hand, if the type of the embroidery frame 21 is not suitable for the selected embroidery pattern sewing, the CPU 42 displays an error message on the liquid crystal display device 5 in S9, and the operator selects the embroidery frame 21 or the embroidery pattern. If you do not change the driving will not start.

When performing the cloth edge copying sewing operation, the operator operates the mode changeover switch 41 to switch to the normal sewing mode. Then, the CPU 42 determines that the mode has been switched to the normal sewing mode. When the operator selects a pattern and operates the start switch, the sewing operation is started. By scanning the cloth edge with light by the light detection device 25 during the sewing operation, the cloth edge is detected and cloth feed control is performed so that the set scanning width is achieved. In this case, the CPU 42 drives the pulse motor 35 to drive the light projecting element 3 of the sensor support member 29.
2 and the light receiving element 33 are moved from left to right in FIG. 5, and the cloth edge is scanned by the light projected from the light projecting element 32. At this time, specifically, the light that does not hit the cloth is reflected by the reflecting plate provided on the needle plate, and the reflected light is received by the light receiving element 33, while the light that hit the cloth is diffusely reflected and reflected. The light is not received by the light receiving element 33.
Therefore, the light receiving element 33 outputs a detection signal whose output level changes according to the position of the cloth edge. The position of the cloth edge is detected based on this detection signal.

[0030]

As is apparent from the above description, according to the present invention, the type of the embroidery frame is detected by scanning with the light by the light detecting device for detecting the cloth edge. There is an excellent effect that the configuration of can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing an external configuration of a sewing machine main body of this embodiment.

FIG. 2 is an explanatory view showing the mechanism of the embroidery machine body of the present embodiment.

FIG. 3 is a perspective view of an embroidery frame support portion of this embodiment.

FIG. 4 is a perspective view of an embroidery frame of this embodiment.

FIG. 5 is a perspective view of the photodetector of this embodiment.

FIG. 6 is a block diagram showing an electrical configuration of this embodiment.

FIG. 7 is a flow chart showing the operation of the CPU of this embodiment.

[Explanation of symbols]

 25 Light Detection Device 21 Embroidery Frame 22 Identification Part 23 Through Hole 24 Reflector 41 Mode Changeover Switch 42 CPU 45 Stitch Forming Mechanism 46 Embroidery Frame Drive Unit 49 Display

Claims (2)

[Claims] 1. A stitch forming means having a vertically moving needle, needle thread catching means cooperating with the needle, and a detection device for detecting the presence or absence of a work cloth near the drop point of the needle, In a sewing machine that normally controls the stitch forming means according to the detection result of the detection device, a plurality of types of embroidery frames for holding the work cloth, a driving means for driving the embroidery frames back and forth, left and right, A detection plate provided on the embroidery frame to discriminate each type of a plurality of types of embroidery frames, and a sewing machine from the normal sewing control mode to the embroidery sewing mode for sewing using the embroidery frame. A sewing machine, comprising: a discriminating means for discriminating the type of the embroidery frame by driving the detection plate of the embroidery frame to a position corresponding to the detection device when switched. 2. The sewing machine according to claim 1, wherein when the selected pattern is not suitable for the result of discrimination of the embroidery frame, an error is displayed on the display device.