JPS62233195A - Cloth edge following stitch sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field] The present invention relates to a zigzag sewing machine, and particularly to a zigzag sewing machine that forms a seam line at a predetermined distance from a side edge of a processed cloth (hereinafter referred to as a cloth edge). Regarding copy stitch sewing machines.

[Prior art] This type of cloth edge copy stitch sewing machine is disclosed in Japanese Patent Application Laid-Open No. 56-1301.
A sewing machine described in Publication No. 79 has been proposed. In this sewing machine, when a switch for copying is operated, a gate serving as a switching means sends information signals from BI1 to BI1 to control the swinging position of the needle bar to form a desired stitch. Stops being supplied to the bite actuator device as a swing drive circuit, and acts so that an information signal for forming a seam line at a predetermined distance from the fabric edge is supplied to the bite actuator device. are doing.

[Problems to be Solved by the Invention] However, since the bite actuator device is driven only in accordance with an information signal for forming a seam line at a predetermined distance from the edge of the fabric, and the swinging position of the needle bar is determined. However, there is a problem in that the seam line is a straight seam, and a desired seam pattern such as a zigzag seam cannot be formed at a predetermined distance from the edge of the fabric.

[Object of the Invention] Therefore, the present invention has been made to solve the conventional problems, and its purpose is to form a desired seam pattern such as a zigzag seam at a predetermined distance from the edge of the fabric. An object of the present invention is to provide a cloth edge copying sewing machine that can perform sewing.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a basic configuration shown in FIG. 2, and the configuration will be explained below. The present invention provides a fabric that has a light emitting part and a light receiving part to detect the side edge extending in the feeding direction of a work cloth placed on a sewing machine bed, and generates a detection signal according to the light receiving part of the light receiving part. The swing position of the needle bar is controlled based on the detection signal and the needle swing data in the stitch data of the pattern selected by the detector and the pattern selection means for selecting a desired pattern from a large number of patterns. and a switching means for supplying the swinging copying control data computed by the computing means to the needle swinging drive device when fabric edge copying is selected by the copying switch. It consists of

[Operation] When fabric edge copy stitching is selected by the copy stitch switch and a desired pattern is selected by the pattern selection device, the data generation device generates stitch data corresponding to the selected pattern. The calculation means controls the swing position of the needle bar in order to form a selected pattern along the fabric edge based on the needle swing data in the stitch data and the detection signal generated by the fabric detector. The oscillation tracing control data to be calculated is calculated. Then, since the fabric edge profiling stitch is selected by the copying stitch switch, the switching means stops the needle swing data from being supplied to the needle swing drive device, and also stops the needle swing data from being supplied to the needle swing drive device. Acts as supplied to the device. As a result, a desired stitch pattern is formed along the fabric edge.

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

FIG. 3 shows a state in which the cover of the head 16 of the sewing machine is removed, and a protrusion 34 fixed to the head 16 is pivoted in a vertical plane by a sword stand 36 or a shaft 38 as a swing support frame. It is movably mounted.

A needle bar 40 is attached to the needle bar stand 36 so as to be slidable in the vertical direction, and a sewing needle 42 is fixed to the lower end of the needle bar 40. The first rod 40 is connected to a sewing machine motor (not shown) via a needle bar holder 44, etc., and the needle bar 40 and sewing needle 42 are caused to reciprocate up and down by driving the sewing machine motor.

In addition, a needle swing control motor, which will be described later, is connected to the needle bar stand 36 via a connecting rod 46, etc., and the needle bar stand 36 is swung by the drive of this needle swing control motor.
The lateral position of the sewing needle 42 is changed within a certain range.

A fabric detector 54 is fixed to the needle bar stand 36, and the needle bar stand 36
It is designed to swing integrally with 6.

The cloth detector 54 includes a light emitting section 56 that emits infrared rays, and a light receiving section 58 that receives reflected infrared rays. Further, an optical filter 60 is provided near the light receiving section 58, which allows infrared rays to pass through but blocks light of other wavelengths.
is provided.

An opening is formed in the upper surface of the bed 10, and this opening is closed by a needle plate 66.

A plurality of slots are formed in the throat plate 66, from which the feed @68 can protrude upward. The feed dog 68 is given a feed motion by a feed control motor (not shown), and works in conjunction with a presser foot (not shown) to feed the workpiece cloth 70 in the front-rear direction. A needle hole 72 which is further elongated in the left-right direction is formed in the throat plate 66, and a reflective surface 74 is formed close to and parallel to this needle hole 72. This reflective surface 74 reflects infrared rays emitted from the light emitting section 56 of the cloth detector 54 toward the light receiving section 58 . The fabric detector 54 detects reflections from a detection area centered at a point a certain short distance diagonally forward to the right (on the operator's side) from the intersection of the center line of the sewing needle 42 and the top surface of the throat plate 66 (hereinafter referred to as the needle drop point). It has the ability to detect light. If most of the detection area is covered by the work cloth 70, the light receiving part 5
8 decreases, and the light receiving section 58 outputs a detection signal corresponding to the area of the detection area that is not covered by the work cloth 70.

Next, the electrical configuration of the sewing machine of this embodiment will be described below with reference to FIG.

The pattern selection switch 24 is shown at the left end of FIG.
0 is connected. The pattern selection counter 80 constitutes a pattern selection means together with the pattern selection switch 24, counts the number of times the pattern selection switch 24 is operated, and supplies the counted contents to the stitch data generation device 82.

The stitch data generation device 82 corresponds to data generation means, and stores stitch data corresponding to each of the stitch patterns that can be formed, and selects a pattern selection counter 8 from among the stitch data.
Stitch data corresponding to a count of 0 is selected and supplied to the feed calculation device 84 and the needle swing calculation device 86.

That is, a timing pulse generator 88 that generates one pulse signal every time the needle bar 40 makes one vertical reciprocating motion is connected to the stitch data generator 82, and each time this timing pulse TP is supplied, The stitch data generating device 82 supplies feed data and needle swing data in the stitch data to a feed calculation device 84 and a needle swing calculation device 86, respectively.

A feed amount adjustment device 89 is connected to the feed calculation device 84, and a needle swing adjustment device 90 is connected to the needle swing calculation device 86. The feed amount adjustment device 89 supplies feed adjustment data to the feed calculation unit M84, which changes according to the operation of a feed amount adjustment operation member (not shown) provided on the sewing machine frame. The feed calculation device 84 multiplies this feed adjustment data by the feed data supplied from the stitch data generation device 82, and calculates the feed amount adjustment operation member by the feed data supplied from the stitch data generation device 82. After making changes corresponding to the operating position, it is supplied to the feed drive control circuit 92.

Similarly, the needle swing calculation device 86 adds changes to the needle swing data supplied from the stitch data generator 82 in accordance with the position of a needle swing adjustment operating member (not shown) installed in the sewing machine frame. Top, copy sewing calculation device 104 and multiplex,
It is supplied to a needle swing control circuit 96 via a step 94. As a result, the feed drive control circuit 92 controls the feed control motor 98, and the needle swing control circuit 96 controls the needle swing control motor 100, so that the swing of the sewing needle 42 and the cloth feed movement by the feed dog 68 are controlled appropriately. Under the control, the stitch pattern selected by operating the pattern selection switch 24 is formed.

The copy stitch a device 110 includes the cloth detector 54 and a variable resistor 112 that outputs a reference signal. The slider of this variable resistor 112 is moved by operating a seam allowance setting operating member (not shown) provided on the sewing machine frame. The output signals of the cloth detector 54 and the variable resistor 112 are supplied to the comparator 114, and the comparator 114 sends a signal with a magnitude corresponding to the difference between these two signals to the A/D converter 11.
6 to an adder 118. This adder 118 is configured to add the digital signals from the A/D converter 116 and the latch 120 every time the timing pulse TP from the timing pulse generator 88 is supplied via the OR circuit 122.

Further, the same timing pulse TP is delayed by the mono multivibrator 124 as a delay means, and the latch 1
20, the latch 120 holds the contents of the adder 118 in response to this delayed timing pulse TP;
The needle position control signal [)a is supplied to the copy stitch calculation device 104.

Note that the timing pulse generator 88 generates a timing pulse T.
P is generated only when the sewing machine motor is rotating and the four rods 40 are reciprocating up and down, so even when the sewing machine is stopped, a clock pulse similar to the timing pulse TP is generated by the adder 118 and the timing pulse TP. A clock pulse generator 126 is provided to be supplied to latch 120 .

However, the clock pulses output from the clock pulse generator 126 are supplied to the adder 118 and the latch 120 via the AND circuit 128 and the OR circuit 122 only when the needle up signal and the sewing machine stop signal are input. It has become.

The copy sewing calculation device @104 corresponds to a calculation means, and is based on the needle swing @ calculation data Bn of the swing motion calculation device @86 and the copy line control device 1.
When the needle swing control signal Da of 10 is supplied, calculation is performed according to the following arithmetic expression, and the calculation result is supplied to the multiplexer 94 as swing tracing control data Dh.

Da-(Or-Bn)xC=Dh Note that Dr is the needle position coordinates (0) to (15) shown in FIG.
Data corresponding to the coordinate (15) in , C is a reduction coefficient and is set to 1/3 in this embodiment.

The profile stitching switch 26 is connected to the multiplexer 94 and also to the pattern selection counter 80 via the one-shot multivibrator 102. When this switch 26 is turned on, a pulse signal is output from the mono multivibrator 102. Pattern selection counter 80
supplied to

Then, the pattern selection counter 80 is activated by the pulse signal.
is reset, and the stitch data generator 82 outputs stitch data for straight stitches.

The multiplexer 94 corresponds to a switching means, and when the copying stitching switch 26 is turned on, the swing copying data from the copying stitching computing device 104 is substituted for the needle swinging calculation data Bn from the needle swinging computing device 86. The state is switched to supply the control data Dh to the needle swing control circuit 96.

When performing copy stitching with a zigzag stitch using the sewing machine configured as described above, the operator first places the workpiece cloth 7 so that the desired position of the zigzag stitch is approximately in the center of the needle hole 72.
Set to 0. Then, when the copying stitch switch 26 is operated, a pulse signal is supplied from the mono multi-vibrator 102 to the pattern selection counter 80, so the pattern selection counter 80 is reset, and no matter what stitch pattern has been selected up to that point, the stitch pattern is straight. The selection is changed to the stitch. Thereafter, the pattern selection switch 24 is operated again to select the zigzag stitch. Further, by operating the copying stitch switch 26, the multiplexer 94 is switched to a state where the swing copying control data Dh from the copying stitch calculation device 104 is supplied to the needle swing control circuit 96.

In the state where the work cloth 70 is set as described above,
The cloth detector 54 supplies a detection signal corresponding to the area of the detection region not covered by the work cloth 70 to the comparator 114. The comparator 114 compares this detection signal with the reference signal from the variable resistor 112, and outputs an error signal corresponding to the difference between the two to the A/D converter 116. This is returned to a digital signal and supplied to the adder 118.

In this state, the sewing machine has not yet been started and the sewing needle 42 is in the up-folding position, so the clock pulse generator 1
The clock pulse from 26 is supplied to adder 118 via AND circuit 128 and OR circuit 122. The adder 118 receiving this clock pulse connects the A/D converter 11
6 and the digital signal from latch 120 are added. The result of this addition is held in the latch 120 after a predetermined minute period of time, and is supplied to the copy sewing calculation device 104 as the needle position control signal (a). Furthermore, when the sewing machine is not started, the stitch data generating device 82
Needle swing data corresponding to the needle position coordinate (0) of the needle number @(0) of the zigzag stitch shown in FIG. 4 is output and supplied to the needle swing calculation device 86.

The needle oscillation calculation device 86 changes the needle oscillation data according to the adjustment value of the needle oscillation adjustment bag @90, but to simplify the following explanation, the needle oscillation data is adjusted in the calculation device 86. It is assumed that the needle oscillation calculation data Bn is output without being changed.

When the needle swing calculation device 86 supplies the needle swing data as the needle swing calculation data Bn to the copy stitch calculation device 104, the copy stitch calculation device 104 calculates according to the above-mentioned calculation formula, and uses the calculation result to control the swing copy stitch. The data oh is supplied to the needle swing control circuit 96 via the multiplexer 94, and the needle swing control circuit 96 drives the needle swing control motor 100 in the direction and amount based on the swing tracing control data Dh. the result,
The needle bar stand 36 is swung, and the position of the fabric detector 54 attached thereto is changed so that the detection signal from the fabric detector 54 becomes equal to the reference signal from the variable resistor 112. Between the time one clock pulse is supplied to the adder 118 and the time the next clock pulse is applied to the adder 118, the needle bar base 36 can be oscillated until the detection signal matches the reference signal. Therefore, the period of the clock pulse is determined.

As a result of the detection signal becoming equal to the reference signal as described above, the error signal from the comparator 114 becomes zero, and the A/D converter 11
The digital signal supplied from 6 to adder 118 also becomes zero. Therefore, in response to the next clock pulse, the adder 118
Even if the addition is performed, the result is the same as the digital signal held in the latch 120, and after a certain period of time, the same digital signal as before is held in the latch 120 and is sent to the copy sewing calculation device as the needle position control signal Da. 104. Further, the needle swing calculation device 86 is connected to the copy stitch calculation device 104.
Since the needle swing calculation data Bn supplied to the needle swing control circuit 96 does not change, the copy stitch calculation device 104 eventually supplies the swing copy control data Dh to the needle swing control circuit 96 via the multiplexer 94.
However, the needle swing control motor 100 and the needle bar stand 36 remain stationary.

If the position of the needle bar stand 36 is changed as described above, the lateral position of the sewing needle 42 is also changed, and the position of the dropping point of the sewing needle 42 corresponds to the large serration of the reference signal from the variable resistor 12. position. If this position is not the desired position, the operator operates the seam allowance setting operation member and adjusts the variable resistor 1.
Change the reference signal from 12. Then, the same operation as in the above case is repeated with respect to the changed reference signal, and the position of the needle bar stand 36 is changed, so that the sewing needle 4 is
The position of the falling point in step 2 changes. When this position reaches the desired position, the operator stops operating the seam allowance setting operation member.

After completing this seam allowance adjustment operation, the copying stitch control device 110 sends a needle position neck control signal @D corresponding to the needle position coordinates (10), for example.
If a is to be output, the special number (0) of the sewing needle 42
The falling point is at the needle position coordinate (5) as shown in FIG.

Then, when the main switch (not shown) is operated to start the sewing machine, the stitch with needle number @ (0) is set to the needle position coordinate (5
) is formed at the position.

In the case of zigzag stitches, as shown in FIGS. 4 and 5, needle swing data corresponding to needle position coordinates (0) and (15) are generated by the stitch data generator 82 every time a timing pulse TP occurs.
is output from. Then, the needle swing data is supplied to the copy stitch calculation device 104 as the needle swing calculation data 3n without being changed in the needle swing calculation device 86, while the needle position control signal Da is sent from the copy line control device 110. The copying stitch calculation device 1 is updated every time the timing pulse TP occurs.
04. For example, if the needle position control signal @Da corresponding to the needle position coordinate (10) is output continuously, the copy stitch calculation device 104 calculates according to the above-mentioned calculation formula,
The oscillation copying control data oh corresponding to the needle position coordinates (5) and 10) are alternately supplied to the needle oscillation control circuit 96 via the multiplexer 94, and the needle oscillation control circuit 96 controls the IT oscillation control motor 100. control. As a result, zigzag stitches are formed alternately at needle position coordinates (5) and (10). The amount of feed of the work cloth 70 at this time is determined by the feed data supplied from the stitch data generator 82 and the feed adjustment data supplied from the feed amount adjustment device 89, as in normal sewing work.

The work cloth 70 is fed as the seam line is formed, and during this process the worker keeps the position of the cloth edge approximately constant, but the degree to which this is held is unavoidable. When the cloth edge position changes in this way, the detection signal from the cloth detector 54 no longer matches the reference signal from the variable resistor 112, so the error signal from the comparator 114 is no longer zero, which causes A The signal is returned to a digital signal by the /D converter 116 and supplied to the adder 118. While the sewing machine is in operation, the timing pulse TP from the timing pulse generator 88 is supplied to the adder 118 via the OR circuit 122. and A/
and the digital signal from the D converter 116. The latch 120 holds this added digital signal at a timing slightly delayed by the mono-multivibrator 124, and supplies it to the copy sewing calculation device 104 as a needle position control signal Da.

For example, if this needle position control signal Da changes to a signal corresponding to needle position coordinates (9), the copying sewing machine 10
4 is calculated according to the above-mentioned calculation formula, and the swing tracing control data oh corresponding to the needle position coordinates (4) and (9) obtained as the result of the calculation is alternately supplied to the needle swing control circuit 96 via the multiplexer 94. Accordingly, the needle swing control motor 1
00 is driven and controlled. As a result, the position at which the zigzag stitch is formed alternates between needle position coordinates (4) and (9). By repeating these operations, zigzag stitches are continuously formed along the edge of the fabric as shown in FIG.

[Modifications] The present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit thereof.

For example, in this embodiment, zigzag stitches are formed along the fabric edge, but other stitch patterns other than straight stitches may be formed along the fabric edge.

[Effects of the Invention] As is clear from the detailed description above, the present invention provides needle swing data in stitch data for sewing a large number of patterns, and a cloth detector that detects the side edges of the work cloth. Since the configuration is such that the swinging copying control data is calculated based on the detection signal from the It can be formed at a predetermined distance from the edge, and the uses of fabric edge copy stitching in i-manufacturing work can be dramatically increased.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a block diagram showing the electrical configuration of the fabric edge copy stitch sewing machine of this embodiment, Fig. 2 is a diagram corresponding to the claims of the present invention, and Fig. 3 is a diagram corresponding to the claims of the present invention. A perspective view showing the sewing machine head with the cover removed; FIG. 4 is a diagram showing the correspondence between stitch numbers and needle position coordinates for zigzag stitches; FIG. 5 is a diagram showing how the zigzag stitches are formed. , FIG. 6 is a diagram showing a zigzag stitch formed along the edge of the cloth by the sewing machine. 10: Bed, 24: Pattern selection switch, 26: Copy sewing switch, 40: Needle bar, 42: Sewing needle, 54: Fabric detector,
56: Light emitting section, 58: Light receiving section, 68: Feed dog, 70: Work cloth, 80: Pattern selection counter.

Claims (1)

[Scope of Claims] 1. A sewing needle (42) is attached to the lower end of the needle bar (40), which is capable of reciprocating up and down movement and swinging movement in the horizontal direction; 70) to the needle bar (4).
a feeding device (68) that applies a feeding motion in synchronization with the up and down reciprocating movement of the needle bar (0); a pattern selection means (24, 80) for selecting a desired pattern from a large number of patterns; 4
Needle swing data and feeding device (6) to control the swing position of
Stitch data consisting of feeding data for controlling the feeding movement of step 8) is stored corresponding to each of the plurality of patterns, and the stitch data of the pattern selected by the pattern selection means (24, 80) is stored in the stitch data of the pattern selected by the pattern selection means (24, 80). data generating means (82) that generates data in synchronization with each vertical reciprocating movement of the needle bar (40); and a needle swing drive device (96) that swings the needle bar (40) in the lateral direction according to the needle swing data. , 100) and a feed drive device (92, 98) for driving and controlling the feed device (68) according to the feed data, the zigzag sewing machine comprising: a sewing machine placed on the sewing machine bed (10); Cloth (70
) to detect the side edge extending in the feeding direction of the light emitting part (5).
6) and a cloth detector (54) having a light receiving section (58) and generating a detection signal according to the amount of light received by the light receiving section (58), and forming the selected pattern along the side edge. In order to do this, the needle bar (40
) has a calculation means (104) for calculating the swinging copying control data for controlling the swinging position of the sewing machine (104), and a copying stitching switch (26) for selecting fabric edge copying stitching,
When the fabric edge copy stitching is not selected, the data generation means (82) supplies the generated needle swing data to the needle swing drive device (96, 100), and the fabric edge copy stitch is selected. A switching means (94) is provided which sometimes stops the supply of the needle swing data and also supplies the swing tracing control data calculated by the calculation means (104) to the needle swing drive device (96, 100). A fabric edge copy sewing machine characterized by: 2. The switching means (94) is configured to switch the copying stitch switch (2).
When fabric edge copy stitching is selected by the operation in step 6), a selection command signal is supplied so that the pattern selection means (24, 80) selects a specific pattern, and then the pattern selection means (24, 80) 2. The fabric edge copy stitch sewing machine according to claim 1, wherein the specific pattern can be selected and changed to a desired pattern by operating a selection operation body (24) in ).