JPH0779884B2 - Sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a zigzag sewing machine, and in particular, a cloth forming a stitch line at a predetermined distance from a side edge (hereinafter, referred to as a cloth edge) of a work cloth. Related to the edge copying sewing machine.

[Prior Art] A sewing machine described in Japanese Patent Application Laid-Open No. 56-130179 has been proposed as a cloth edge copying sewing machine of this type. In this sewing machine, when a switch for performing contour stitching is operated, the gate as switching means receives a needle bar rocking information signal for controlling the rocking position of the needle bar to form a desired stitch. The information signal for stopping the supply to the needle bar rocking actuator device as the needle rocking drive circuit and forming a stitch line at a predetermined distance from the cloth edge is the needle bar rocking actuator device. Is working to be supplied to.

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

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the conventional problems, and an object thereof is to form a desired stitch pattern such as a zigzag stitch at a predetermined distance from the cloth edge. The present invention is to provide a cloth edge copying sewing machine that can be used.

[Means for Solving Problems] In order to solve the above-mentioned object, the present invention has a basic configuration shown in FIG. 10, and the configuration will be described below.

The present invention has a light emitting portion and a light receiving portion for detecting a side edge of a work cloth placed on a sewing machine bed and extending in a feed direction, and at least the light receiving portion is in a lateral swing motion direction. Output corresponding to each of a desired pattern selected from a large number of patterns and a cloth detector movably arranged in the swing direction relative to a swing support frame arranged in the frame. Detector driving means for moving the light receiving portion in accordance with the needle swing signal, a control means for generating a needle swing scanning signal for determining the swing position of the swing support frame based on the amount of light received by the light receiving portion, and the needle. There is provided switching means for switching the operating state between a state in which the needle swing drive means for swinging and driving the rod in the lateral direction operates in accordance with the needle swing signal and a state in which it operates in accordance with the needle swing profile signal.

[Operation] In the sewing machine configured as described above, when the copy stitch is selected and the desired stitch pattern is selected by the pattern selecting means, the switching means causes the needle swing drive means to follow the needle swing scan signal. After switching to the operating state, the stitch signal generating means generates a stitch signal corresponding to the selected stitch pattern. The detector driving means moves the light receiving portion in accordance with the needle swing signal in the stitch signal to change the amount of light received by the light receiving portion. At this time,
If the position of the side edge of the work cloth on the sewing machine bed changes, the light receiving amount of the light receiving unit further changes, and the control means generates a needle swinging scanning signal based on the changed light receiving amount. The needle swing drive means swings and drives the needle bar in accordance with the needle swing profile signal, so that a desired stitch pattern is formed along the fabric edge.

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

First, FIG. 3 shows a state in which the machine frame 18 of the sewing machine of this embodiment is shown by a chain double-dashed line and the head 16 is removed from the cover. The sewing machine frame 18 includes a bed 10 and a fixed support frame 20 fixed to the head 16 by a pillar and an upper arm (not shown). It is swingably attached by a shaft 24. A needle bar 26 is attached to the needle bar base 22 so as to be vertically slidable, and a sewing needle 28 is attached to the lower end of the needle bar 26. The needle bar 26 is connected to a sewing machine motor (not shown), and the needle bar 26 and the sewing needle 28 can be vertically reciprocated by driving the sewing machine motor.

The cloth detector 54 includes a light emitting portion 56 that emits infrared light and a light receiving portion 58 that receives the reflected infrared light. The light emitting portion 56 and the light receiving portion 58 are embedded in the movable body 59. Has been done. Further, below the movable body 59, in the vicinity of the light receiving portion 58, an optical filter 60 is fixedly provided which allows the passage of infrared rays but blocks light of other wavelengths. A support base 40 for supporting the movable body 59 is fixed to a connecting rod 30 orthogonal to the needle bar 26, and, as shown in FIG. 4, the needle bar base 22 is a swing drive member via the connecting rod 30. 32 is connected to one arm. The swing driving body 32 is a second vertical shaft 34 disposed in the sewing machine frame 18.
The fan gear 38 formed on the other arm of the swing drive body 32 is rotatably mounted about the output of the needle swing control motor 100 fixedly installed in the sewing machine frame 18. It is configured to threadably engage a pinion 36 mounted on the shaft.

The needle bar base 22, the connecting rod 30, the swing drive body 32, and the first
And the sewing machine frame 18 between the second vertical shafts 24, 34 and the connecting rod 3
A parallel four-bar linkage mechanism is configured to move 0 in parallel, and the link rod 30 is held so as to move in a direction always orthogonal to a feed movement direction of a feed dog 68 described later. Movable body 59
In order to movably support the movable rod in the moving direction of the connecting rod 30, the guide rod 42 penetrating the movable body 59 and the screw rod 44 screwed with the movable body 59 are as shown in FIGS. 5 and 6. Further, it is installed in parallel between both support pieces 46 and 48 formed on the support base 40.

A detection motor 50, which is a reversible DC motor for rotating the screw rod 44, is fixed to the support piece 48, and its output shaft is connected to the screw rod 44. A position detector 62 is fixed to the support base 40 in order to detect the position of the cloth detector 54 moved by the rotation of the detection motor 50. The position detector 62 is composed of a sliding type variable resistor, and the manual portion 63 is connected to a connecting protrusion 64 protruding above the movable body 59. With this configuration, the position detector 62 is the cloth detector 54.
It is possible to generate a detected position signal KES having a level corresponding to the position of.

An opening is formed on the upper surface of the bed 10, and the opening is closed by the needle plate 66. A plurality of slots are formed in the needle plate 66, and feed dogs 68 can be projected upward from the slots. The feed dog 68 is given a feed motion by a feed control motor, which will be described later, and feeds the work cloth 70 in the front-rear direction in cooperation with a presser foot (not shown). The needle plate 66 is further formed with a needle hole 72 that is long in the left-right direction. The reflecting surface is close to and parallel to the needle hole 72.
74 are formed. The reflecting surface 74 is the cloth detector 54.
The infrared light emitted from the light emitting section 56 is reflected toward the light receiving section 58. The cloth detector 54 is a reflection from a detection area centered on a point which is a small distance to the front right (worker side) from the intersection of the center line of the sewing needle 28 and the upper surface of the needle plate 66 (hereinafter referred to as the needle drop point). It has the ability to detect the amount of light. If much of the detection area is covered with the work cloth 70, the amount of light received by the light receiving unit 58 decreases, and the light receiving unit 58 outputs a detection signal corresponding to the area of the part of the detection area not covered by the work cloth 70. It is supposed to do.

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

The pattern selection switch 74 is shown at the left end of FIG. A pattern selection counter 80 is connected to the pattern selection switch 74. The pattern selection counter 80 has a pattern selection switch 74
Together with this, it constitutes pattern selecting means, counts the number of times the pattern selecting switch 74 is operated, and supplies the count content to the stitch signal generator 82.

As shown in FIG. 7, the timing pulse generator 88 generates a first timing pulse BCP for needle swing control and a second timing pulse FCP for feed control in synchronization with each rotation of a sewing machine spindle (not shown). Is configured to occur.

The stitch signal generation device 82 corresponds to the stitch signal generation means, stores the stitch signals corresponding to each of the stitch patterns that can be formed, and counts the count content of the pattern selection counter 80 from those stitch signals. , A needle swing signal HDS in the stitch signal is generated in response to the first timing pulse BCP supplied via the analog switch 78, and the stitch signal The feed signal NDS is configured to be generated in response to the second timing pulse FCP.

A feed amount adjusting device 89 is connected to the feed calculating device 84, and a needle swing adjusting device 90 is connected to the needle swing calculating device 86. The feed amount adjusting device 89 supplies the feed calculating device 84 with a feed adjusting signal that changes according to an operation of a feed amount adjusting operation member (not shown) provided on the sewing machine frame 18. The feed calculation device 84 multiplies this feed adjustment signal by the feed signal supplied from the stitch signal generator 82, and the feed signal supplied from the stitch signal generator 82 is added to the feed amount adjustment operation member. It is supplied to the feed drive control circuit 92 after being changed according to the operation position. In the same manner, the needle swing calculation device 86 receives the needle swing signal supplied from the stitch signal generator 82 as well as the sewing machine frame 18
A needle swing adjusting operation member (not shown) provided in the above table is changed according to the position, and then supplied to the needle swing control circuit 96 via the multiplexer 94. As a result, the feed drive control circuit 92
For controlling the feed control motor 98, and the needle swing control circuit 96 for controlling the needle swing control motor 100. The swing of the sewing needle 28 and the cloth feed movement by the feed dog 68 are appropriately controlled to control the pattern selection switch 74. The stitch pattern selected by the operation is formed.

The copy stitching switch 76 constitutes a switching unit together with the multiplexer 94, and is connected to the multiplexer 94 and the analog switch 78. When the switch 26 is turned on, the analog switch 78 is switched to the state of supplying the second timing pulse FCP instead of the first timing pulse BCP to the stitch signal generator 82, and the multiplexer 94 is It is possible to switch to a state in which not the output signal of the needle swing calculation device 86 but the output signal of the copy sewing control device 110 (hereinafter referred to as the needle swing copy signal HS) is supplied to the needle swing control circuit 96.

The copy stitching control device 110 corresponds to a control means, and the cloth detector 5
4 and a variable resistor 112 that outputs a reference signal.
The slider of the variable resistor 112 is moved by operating a seam allowance setting operation member (not shown) provided on the sewing machine frame 18. The output signals of the cloth detector 54 and the variable resistor 112 are supplied to the comparator 114, and the comparator 114 outputs a signal having a magnitude corresponding to the difference between these two signals to the adder 118 via the A / D converter 116. Supply. The adder 118 is provided with the A / D converter 116 every time the first timing pulse BCP issued from the timing pulse generator 88 is supplied through the OR circuit 122.
And the digital signals from the latch 120 are added together. Further, the same first timing pulse BCP is delayed by the mono-multivibrator 124 and supplied to the latch 120, and the latch 120 holds the contents of the adder 118 according to the delayed first timing pulse BCP. It has become.

The timing pulse generator 88 is
BCP and FCP are emitted when the sewing machine motor rotates and the needle bar 26
Since only when the sewing machine is vertically reciprocating, the first timing pulse BC is generated even when the sewing machine is stopped.
A clock pulse generator 126 is provided so that a clock pulse similar to P is provided to adder 118 and latch 120. However, the clock pulse output from the clock pulse generator 126 is 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 detector drive device 130 corresponds to the detector drive means and includes the position detector 62 formed of a variable resistor.
Is configured to supply the detected position signal KES to the comparator 136.

In addition, the needle swing signal HD supplied from the stitch signal generator 82
S is converted by the D / A converter 132, divided into 1/3 by the voltage divider 133, converted into the detector movement signal KAS, and then supplied to the comparator 136. Comparator 1
The reference numeral 36 supplies a differential signal MS having a level corresponding to the difference between the supplied signals KES and KAS to the motor control circuit 138, and the motor control circuit 138 controls the detection motor 5 so that the differential signal MS becomes zero.
It controls the drive of 0.

In the sewing machine configured as described above, for example, when performing stitch sewing using zigzag stitches, the operator first sets the work cloth 70 so that the desired formation position of the zigzag stitches is substantially in the center of the needle hole 72. To do. Then, if the copy stitching switch 76 is operated, the analog switch 78 causes the first timing pulse BC
The second timing pulse FCP is switched to the state of supplying the second timing pulse FCP to the stitch signal generation device 82 instead of P, and the multiplexer 94 further causes the needle swinging copy signal HS from the copy stitching control device 110 to receive the needle swinging control circuit. It is switched to the state of supplying to 96.

Next, when the operator selects the zigzag stitch by operating the pattern selection switch 74, the pattern selection counter 80 supplies the count content corresponding to the zigzag stitch to the stitch signal generator 82. In this state, since the sewing machine has not been started yet, both timing pulses BCP and FCP have not been generated from the timing pulse generator 88, and the stitch signal generator 8
2 outputs the needle swing signal HDS corresponding to the needle position coordinate (0) of the stitch number (0) as shown in FIGS. 8 and 9, and outputs D
It is supplied to the comparator 136 as a detector movement signal KAS via the / A converter 132 and the voltage divider 133. The comparator 136 sends this signal KAS
And the detected position signal KES of the position detector 62 corresponding to the actual position of the cloth detector 54 are compared, and a difference signal MS of a level corresponding to the difference between both signals KAS and KES is supplied to the motor control circuit 138. , The motor control circuit 138 controls the drive of the detection motor 50 so that the level of the differential signal MS becomes zero level, and the cloth detector 54 causes the needle movement signal to the needle bar 26 and the needle bar base 22.
It is moved relatively to the position designated by KAS. As a result, the sliding portion 63 of the position detector 62 moves, the detected position signal KES matches the detector movement signal KAS, and the drive of the detection motor 50 is stopped.

In this state, the cloth detector 54 supplies the comparator 114 with the detection signal KS corresponding to the area of the portion of the detection area not covered by the work cloth 70. The comparator 114 compares the detection signal KS with the reference signal from the variable resistor 112, outputs an error signal having a magnitude corresponding to the difference between them to the A / D converter 116, and the A / D converter 116. Converts this into a digital signal and supplies it to the adder 118.

Since the sewing needle 42 is in the raised position when the sewing machine is not activated, the clock pulse from the clock pulse generator 126 is supplied to the adder 118 via the AND circuit 128 and the OR circuit 122. Upon receiving this clock pulse, the adder 118 receives the digital signal from the A / D converter 116 and the latch 1
Add with the digital signal from 20. The result of this addition is held in the latch 120 after a certain minute time.

The digital signal held in the latch 120 is supplied to the needle swing control circuit 96 as a needle swing scan signal HS via the multiplexer 94, and the needle swing control circuit 96 receives the needle swing scan signal HS.
The needle swing control motor 100 is driven by the direction and amount based on the above. As a result, the connecting rod 30 moves via the swing drive body 32,
The needle bar base 22 and the cloth detector 54 are swung together with the connecting rod 30. Then, the position of the cloth detector 54 is changed so that the detection signal from the cloth detector 54 becomes equal to the reference signal from the variable resistor 112.

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 digital signal supplied from the A / D converter 116 to the adder 118 also becomes zero. Therefore, even if the adder 118 performs addition in response to the next clock pulse, the result is the same as the digital signal held in the latch 120, and the same digital signal as before is held in the latch 120 after a certain short time. Will be done. Eventually, the needle swing control signal HS supplied to the needle swing control circuit 96 via the multiplexer 94 does not change, and the needle swing control motor 10
0 and the needle bar base 36 are kept stationary.

If the position of the needle bar base 22 is changed as described above, naturally the lateral position of the sewing needle 28 is also changed, and the position of the dropping point of the sewing needle 28 corresponds to the magnitude of the reference signal from the variable resistor 112. Becomes If this position is not the desired position, the operator operates the above-mentioned seam allowance setting operation member to change the variable resistor 112.
Change the reference signal from. Then, the same operation as that described above is repeated for the changed reference signal, and the position of the needle bar base 22 is changed, so that the position of the drop point of the sewing needle 28 changes accordingly. When this position becomes the desired position, the operator stops the operation of the seam allowance setting operation member. By this operation, for example, the sewing needle 28 is located at the needle position To corresponding to the needle position coordinate (5) shown in FIG.
It shall be located at o. Here, when the operator operates the main switch (not shown) to start the sewing machine,
The sewing needle 28 descends and the first stitch is formed at the needle position To.

A second timing pulse FCP is generated as the sewing needle 28 descends, and the stitch signal generator 82 responds to the pulse FCP.
Generates the stitch signal of the stitch number (1), and the needle swing signal HDS corresponding to the needle position coordinate (15) in the stitch signal is D / A
After passing through the converter 132 and the voltage divider 133, it is converted into a detector movement signal KAS having a level of 1/3 of the value of the needle swing signal HDS and supplied to the comparator 136. At this time, since the level of the detected position signal KES of the position detector 62 is the level corresponding to the needle position coordinate (0), the comparator 136 outputs the two signals KES supplied thereto.
The motor control circuit 138 outputs the difference signal MS corresponding to the difference between ES and KAS.
Then, the motor control circuit 138 controls the detection motor 50 so that the level of the differential signal MS becomes zero level. The screw rod 44 is rotated by the drive of the detection motor 50 and the cloth detector is detected.
54 moves in the swinging direction of the needle bar 26. As a result, the light receiving unit 58
Moves to the position SBo corresponding to the coordinate (5) of 1/3 of the needle position coordinate (15) of the stitch number (1).

Since the amount of light received decreases due to the movement of the light receiver 58, when the first timing signal BCP is generated, the copying sewing controller 110 outputs the needle swinging scan signal HS that increases the amount of light received by the light receiver 58 to the multiplexer 94. To the needle swing control circuit 96, and the needle swing control circuit 96 controls the needle swing control motor 100 in accordance with the needle swing scan signal HS, and the needle swing control motor 1
By driving 00, the connecting rod 30 moves in parallel. Detector 58 with the movement of the connecting rod 30 to the position ST _1, the sewing needle 28 is moved to the position T _1, stitches are formed at the location T _1. At this time, the feed direction and feed amount are determined by the feed signal NDS supplied from the stitch signal generator 82 and the feed adjustment signal supplied from the feed amount adjusting device 89, as in the normal sewing operation.

Then, as described above, when the sewing needle 28 descends and the second timing pulse FCP is generated, the stitch signal generator 82 follows the pulse FCP and the needle position coordinate (0) of the stitch number (2).
To generate needle swing signal HDS corresponding to
Supply to 30. The cloth detector driving device 130 performs the above-mentioned operation, and the light receiving unit 58 moves to the position SB ₁ .

Since the light receiving amount increases due to the movement of the light receiving unit 58, when the first timing signal BCP is generated, the copying sewing control device 110 outputs the needle swinging scanning signal HS that decreases the light receiving amount of the light receiving unit 58 to the multiplexer 94. To the needle swing control circuit 96, and the needle swing control circuit 96 controls the needle swing control motor 100 in accordance with the needle swing scan signal HS, and the needle swing control motor 1
By driving 00, the connecting rod 30 moves in parallel. With the movement of the link rod 30, the light receiving portion 58 and the sewing needle 28 are moved to the positions ST ₂ and T _2.
2 and the seam is formed at the position T ₂ .

The zigzag stitch is formed by repeating such an operation, and the interval between the light receiving portion 58 and the sewing needle 28 when the stitch is formed is as shown in FIG. 2 according to the needle swing signal HDS. Is alternately changed to the interval l ₁ and the interval l _2, and the positions STo, ST ₁ , ...
The zigzag seam is also formed along the cloth edge as it moves along the cloth edge.

In the present embodiment, the cloth detector 54 is mounted on the connecting rod 30 that is translated in the direction orthogonal to the feed direction of the feed dog 68 without mounting the cloth detector on the needle bar base that swings about the vertical axis. It is installed. In the conventional device in which the cloth detector is attached to the needle bar base that swings around the vertical axis, the sewing needle and the cloth detector in the direction orthogonal to the feed direction may differ due to the difference in the distance between the sewing needle and the cloth detector from the vertical axis. Since the position of the cloth detector greatly differs depending on the swing position of the sewing needle, it was not possible to position the sewing needle at a certain distance from the cloth edge. However, in the present embodiment, since the moving direction of the cloth detector 54 is held parallel to the direction orthogonal to the feed direction by the above-described configuration, the sewing needle 28 is held relative to the cloth edge regardless of the swing position of the sewing needle 28. Can be positioned accurately.

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

For example, in this embodiment, zigzag stitches are formed along the cloth edge, but other decorative patterns can be formed along the cloth edge. Further, the position detector 62 operatively connected to the cloth detector 54 is used to detect the position of the cloth detector 54 in the swinging direction of the needle bar 26, but instead of this position detector 62, It is also possible to use a detector connected to the output shaft of the detection motor 50.

[Effects of the Invention] As is clear from the above description, according to the present invention, the light receiving section is moved based on the needle swing signal in the stitch signal for forming a large number of patterns, and Change the amount of light received,
Since the swing position of the needle bar is controlled based on the amount of received light, it is possible to form stitch patterns other than straight stitches at a predetermined distance from the fabric edge, which dramatically improves the use of copy stitching. Can be increased to

[Brief description of drawings]

FIGS. 1 to 9 show a cloth edge copying sewing machine according to an embodiment of the present invention. FIG. 1 is a block diagram showing an electrical configuration of the sewing machine, and FIG. 2 is a sewing needle and sewing machine in this embodiment. FIG. 3 is a perspective view showing the operation of the light receiving portion, FIG. 3 is a perspective view showing the head of the sewing machine with its cover removed, and FIG. Fifth enlarged top view showing
The figure is an enlarged front view showing the structure for movably attaching the cloth detector to the connecting rod, FIG. 6 is a partial sectional view taken along the line 6-6 of FIG. 5, and FIG. 7 is the vertical movement of the sewing needle. 8 is a timing chart showing the timing of generation of a timing pulse, FIG. 8 is a diagram showing the relationship between the stitch number and the needle position coordinate in the zigzag stitch, FIG. 9 is a diagram showing the formation form of the zigzag stitch, and FIG. 10 is It is a claim corresponding figure of this invention. 10: Bed, 18: Sewing machine frame, 22: Needle bar stand, 24: First vertical axis,
26: Needle bar, 28: Sewing needle, 30: Continuous rod, 32: Oscillating drive, 34: Second vertical axis, 54: Cloth detector, 56: Light emitting part, 58: Light receiving part, 70: Work cloth, 74:
Pattern selection switch, 76: Copy sewing switch, 80: Pattern selection counter, 82: Stitch signal generator, 94: Multiplexer, 96: Needle swing control circuit, 100: Needle swing control motor, 110: Copy stitch control device , 130: cloth detector drive device, HDS: needle swing signal, HS: needle swing scanning signal

Claims (2)

[Claims] 1. A needle bar (2) having a sewing needle (28) attached to a lower end thereof.
6) a swing support frame (22) that is supported on the sewing machine frame (18) so as to be capable of swinging in the horizontal direction,
The pattern selecting means (74, 80) for selecting a desired pattern from a large number of patterns and the stitch signal including the needle swing signal (HDS) for controlling the swing position of the needle bar (26) The pattern selecting means (74, 80) is stored corresponding to each of a number of patterns.
Stitch signal generating means (8) for generating a stitch signal of the pattern selected by
2) and the needle bar (26) according to the needle swing signal (HDS).
In a zigzag sewing machine equipped with a needle swing drive means (96, 100) for swinging the workpiece in the horizontal direction, a side edge extending in the feed direction of a work cloth (70) placed on the sewing machine bed (10) is detected. Therefore, it has a light emitting part (56) and a light receiving part (58), and at least the light receiving part (58) is arranged so as to be movable in the rocking direction relative to the rocking support frame (22). A cloth detector (54), a detector driving means (130) for moving the light receiving section (56) according to the needle swing signal (HDS), and the shaking based on the amount of light received by the light receiving section (58). Dynamic support frame (2
2) The control means (110) for generating the needle swinging follow-up signal (HS) that determines the swinging position and the needle swinging driving means (96, 100) are connected to the needle swinging signal (HD).
S) and the needle rocking scanning signal (H
And a switching means (76, 94) for switching the operation state between the operation state according to S) and the operation state according to S). 2. The swing support frame (22) is rotatably supported by a first vertical shaft (24) on the sewing machine frame (18),
The needle bar (26) is supported at its free end so as to be capable of reciprocating vertically, and the needle swing control motor (100) in the needle swing drive means (96, 100) is mounted on the sewing machine frame (18). 2 vertical axis (3
4) is operatively connected to a swing drive body (32) rotatably supported by the swing drive body (32) and both free ends of the swing support frame (22). 30) connected between the swing support frame (22), the swing drive body (32), the connecting rod (30), and the first and second vertical shafts (24, 34). The machine frame (18) of the sewing machine constitutes a four-bar linkage mechanism that enables the parallel movement of the connecting rod (30), and the connecting rod (3)
The cloth edge copying sewing machine according to claim 1, wherein the light receiving portion (58) is mounted on the top of the sewing machine.