JP5013780B2 - Sewing sewing machine - Google Patents

Description

  The present invention relates to an edge stitch sewing machine.

A bead stitch sewing machine is known in which a flap cloth is sewn to a body cloth and a bead cloth. In such an edge stitch sewing machine, a flap detection device for detecting an end portion of the flap cloth conveyed to the needle drop position is provided at the head of the sewing machine frame. The flap detection device includes a light emitting unit that emits light from above the work table that conveys the flap cloth, and a light receiving unit that receives light reflected by the large press, and the light receiving unit receives the reflected light. Whether or not the end of the flap cloth can be detected at a preset position is determined. In the flap detection device, for example, the detection optical axis is aligned with the upstream side in the conveyance direction of the flap cloth by a predetermined distance from the needle drop position, and the control unit that controls the sewing of the edge stitch sewing machine performs sewing based on the predetermined distance. Control is performed (for example, refer to Patent Document 1).
Japanese Patent No. 2716970

  However, when attaching the flap detection device to the head of the sewing machine frame, it is necessary to adjust the position with high accuracy so that the light emitting unit irradiates an accurate position. Even if the position of the flap detection device is accurately adjusted, the flap detection device may be displaced in the direction of the force applied to the fastening member when it is fixed to the sewing machine frame by a fastening member such as a screw. Fixing the detection device was also difficult. Due to these factors, when the flap detection device cannot accurately detect the end portion of the flap cloth, there is a problem that the sewing as desired by the user cannot be performed and the quality of the sewing product is deteriorated.

Therefore, the present invention has been made to solve the above-described problems, and even if the position of the flap detection device is not accurately adjusted or fixed to the sewing machine frame, the user desires. An object of the present invention is to provide an edge stitch sewing machine that can be sewn and can prevent deterioration in quality of a sewing product.
Another object of the present invention is to provide an edge stitch sewing machine capable of accurately positioning the flap detection device.

  The invention according to claim 1 has a needle up-and-down moving mechanism that has two sewing needles that are moved up and down by a spindle motor, and that forms two parallel seams by moving up and down the two sewing needles. And a cloth moving mechanism that conveys the fabric by holding the cloth on the work table from above by a pair of large pressers extending in the fabric transport direction and moving the large presser in the transport direction, and A flap holding mechanism for holding a flap cloth to be sewn on the cloth on the upper surface of the large presser, a light emitting unit for irradiating the cloth ground with a point mark serving as a positioning reference when the cloth is arranged on the work table, and A marking irradiation device having marking driving means for moving the irradiation position of the point mark along the cloth feeding direction, and upstream of the workbench from the needle drop position of the two sewing needles upstream of the cloth feeding direction A light projecting member that emits visible light, a detection member that detects reception of reflected light from a reflective surface that reflects the visible light formed on the upper surface of the large presser along the longitudinal direction, and the light projecting A flap detecting means for detecting an end portion of the flap cloth held by the flap holding mechanism, and a flap cloth by the flap detecting means. Feed length storage means for storing the feed length of the flap from when the end of the flap is detected until the end of the flap cloth reaches the needle drop position of the two sewing needles, and the flap detection signal A sewing start timing or a sewing end timing by the needle up-and-down movement mechanism is determined based on the detection signal from and the stored feed length, and the cloth movement mechanism and the needle up-and-down movement mechanism are controlled to And a movement command output means for outputting a command signal for moving the point mark along the feed direction by an operation, and a control means for sewing a flap cloth on the ground, based on the command signal. Command control means for moving the point mark by driving the marking drive means, and the point mark moved based on the command signal coincides with an irradiation point at which visible light of the light projecting member is projected on the work table When the operation is performed, the stored feed length is corrected based on the coincidence signal output means for outputting the coincidence signal when operated and the driving information of the marking drive means when the coincidence signal is outputted. And a correcting means.

According to the first aspect of the present invention, when a command signal for moving the point mark along the feed direction is output by operating the movement command output means, marking driving is performed based on the output command signal. The means is driven and the point mark moves.
Here, when the point mark moved by the operation of the movement command output means coincides with the irradiation point at which the visible light of the light projecting member is projected on the work table, the operator operates the coincidence signal output means. The flap feed length from when the coincidence signal is output and the flap detection means detects the end of the flap cloth based on the driving information of the marking drive means at that time until the end of the flap cloth reaches the needle drop position Is corrected by the correcting means. The control means determines the sewing start timing or the sewing end timing based on the corrected feed length.
As a result, the feed length is corrected from the detection position of the end of the flap cloth of the flap detection means to the sewing needle even if the flap detection means is not accurately adjusted or fixed to the sewing machine frame. As a result, since the sewing start timing or the sewing end timing can be corrected according to the deviation of the position of the flap detection means, the sewing can be performed as desired by the user. Quality degradation can be prevented.

The invention according to claim 2 has a needle up-and-down moving mechanism that has two sewing needles that are moved up and down by a spindle motor, and that forms two parallel seams by moving up and down the two sewing needles. And a cloth moving mechanism that conveys the fabric by holding the cloth on the work table from above by a pair of large pressers extending in the fabric transport direction and moving the large presser in the transport direction, and A flap holding mechanism for holding a flap cloth to be sewn on the cloth on the upper surface of the large presser, a light emitting unit for irradiating the cloth ground with a point mark serving as a positioning reference when the cloth is arranged on the work table, and A marking irradiation device having marking driving means for moving the irradiation position of the point mark along the cloth feeding direction, and upstream of the workbench from the needle drop position of the two sewing needles upstream of the cloth feeding direction A light projecting member for irradiating selfish visible light, provided the light projecting member on the lower surface, the light receiving of the reflected light from the along the longitudinal direction of the large pressing reflecting surface for reflecting the visible light formed on the upper surface A flap detecting means for detecting an end portion of the flap cloth held by the flap holding mechanism, and having a detection member for detection and an adjustment mechanism for holding the detection member so that the position of the detection member can be adjusted along the cloth feed direction; The feed length for storing the feed length of the flap from when the end of the flap cloth is detected by the flap detecting means until the end of the flap cloth reaches the needle drop position of the two sewing needles Based on a storage means, a detection signal from the flap detection signal and the stored feed length, a sewing start timing or a sewing end timing by the needle up / down movement mechanism is determined, and the cloth movement mechanism and the And a control means for sewing a flap cloth on the fabric by controlling a vertical movement mechanism, wherein the point mark of the marking irradiating device is such that the visible light of the light projecting member is placed on the work table. Drive information storage means for storing drive information for driving the marking drive means so as to coincide with the projected irradiation point, and marking for driving the marking drive means based on the drive information stored in the drive information storage means And a light drive control means.

According to the second aspect of the invention, the marking light drive control means drives the marking so that the point mark stored in the storage means coincides with the irradiation point at which the visible light of the light projecting member is projected on the work table. Read drive information to drive the means. Then, the marking light drive control means drives the marking light drive means based on the stored drive information, and automatically irradiates the point mark with the visible light irradiation point of the light projecting member.
As a result, when attaching the flap detection means, the operator can make the visible light emitted from the light projecting member coincide with the position of the point mark emitted from the marking light driven by the control of the marking light drive control means. The flap detection means can be mounted with its position adjusted. Therefore, the flap detection means can be attached so that visible light is always projected at the same position, and the flap can be detected at an accurate position.

  According to the first aspect of the present invention, even if the flap detecting means is not accurately positioned or fixed to the sewing machine frame, the sewing needle is detected from the end detection position of the flap cloth of the flap detecting means. As a result, the sewing start timing or the sewing end timing can be corrected according to the deviation of the position of the flap detection means, so that sewing can be performed as desired by the user. It is possible to prevent deterioration of the quality of the sewing product.

  According to the second aspect of the present invention, when attaching the flap detection means, the operator irradiates the position of the point mark emitted from the marking light driven by the control of the marking light drive control means from the light projecting member. The flap detecting means can be mounted with its position adjusted so that the visible light matches. Therefore, the flap detection means can be attached so that visible light is always projected at the same position, and the flap can be detected at an accurate position.

(Overall configuration of the stitching machine)
Hereinafter, the edge stitch sewing machine of the present invention will be described.
1 and 2 are perspective views showing the overall schematic configuration of the edge stitch sewing machine 1, and FIG. 3 is a front view of the edge stitch sewing machine 1. FIG. In the present embodiment, the direction of each part of the edge stitch sewing machine 1 is determined based on the XYZ axes shown in the drawings. In a state in which the bead stitch sewing machine 1 is installed on the horizontal plane, the Z-axis direction is the vertical direction, the X-axis direction is the horizontal and the cloth feed direction, the Y-axis direction is horizontal and orthogonal to the X-axis direction. Direction.

The bead-sewn sewing machine 1 is a sewing work table, a table 2 as a mounting table on which the body cloth C is placed, a sewing machine frame 3 installed on the table 2, and a sewing machine frame 3. The sewing machine has two sewing needles 11 and 11 which are provided and are moved up and down by a built-in spindle motor 16 (see FIG. 6). By moving the two sewing needles 11 and 11 up and down, the body cloth C is moved. The body cloth C on the table 2 is held from above by the needle up-and-down moving mechanism 10 that forms two parallel seams, and a pair of large pressers 21 and 21 extended in the conveying direction of the cloth C. The cloth movement mechanism 20 that conveys the cloth C by moving the cloth 21 and 21 in the conveyance direction, and the flap holding mechanism 30 that holds the flap cloth sewn on the cloth C on the upper surfaces of the large pressers 21 and 21 (see FIG. 5). ) And dough Is irradiated by the marking lights 41 and 42 as the light emitting unit for irradiating the body cloth C with the point mark P (see FIG. 4) for aligning with the set position on the table 2. A marking irradiation device 40 having an X-axis position adjusting motor 43 as marking driving means for driving the marking lights 41 and 42 to move the irradiation position of the point mark P along the feeding direction of the body cloth C; The moving knife 14 (see FIG. 3) is moved up and down on the downstream side of the sewing needles 11 and 11 in the cloth feed direction, and a knife mechanism (not shown) for forming a cut in the body cloth C, and the sewing thread is captured from the sewing needles 11 and 11. And a hook mechanism (not shown) that entangles the lower thread and a corner knife mechanism 50 (see FIG. 3) that forms a substantially V-shaped cut at positions that are both ends of the straight cut. Flap detection for detecting the end of the flap cloth when the flap cloth held by the flap holding mechanism 30 and placed on the cloth C is conveyed together with the cloth C by the cloth moving mechanism 20 in the cloth feeding direction. Based on a flap detection device 60 as a means and a detection signal from the flap detection device 60, a sewing start timing or a sewing end timing by the needle vertical movement mechanism 10 is determined, and the cloth movement mechanism 20 and the needle vertical movement mechanism 10 are controlled. And a control device 70 as control means for sewing the flap cloth onto the body cloth C.
When the sewing machine 1 starts sewing, the so-called automatic edge sewing in which a series of sewing operations are performed in accordance with various parameters required for the preset ball sewing without requiring any other input operation. Sewing machine.

(Table and sewing frame)
As shown in FIGS. 1 to 3, the table 2 is used in a horizontal state with its upper surface parallel to the XY plane. A needle plate 15 is attached to a needle drop position 15 a by the sewing needles 11, 11 on the table 2. The needle plate 15 is formed with a needle hole into which the two sewing needles 11 and 11 are individually inserted and a slit through which the moving knife 14 of the knife mechanism is inserted.
A recess for storing the bed 31 of the sewing machine frame 3 is formed on the table 2, and the sewing machine frame 3 is installed in the recess. Furthermore, the cloth moving mechanism 20 and the corner knife mechanism 50 are disposed on the downstream side of the sewing machine frame 3 in the cloth feeding direction, and the binder mechanism (not shown except for the binder 12) is disposed on the upstream side of the cloth feeding direction. Has been.

The sewing machine frame 3 mainly includes a bed portion 31 installed on the table 2, a vertical trunk portion 32 erected therefrom, and an arm portion 33 extending horizontally from the upper portion thereof. Yes.
A main shaft motor 16 is disposed below the sewing machine frame 3, and a lower shaft that transmits the rotational driving force of the shuttle mechanism from the main shaft motor 16 is supported in the bed portion 31 along the Y-axis direction. An upper shaft that transmits the vertical driving force output from the spindle motor 16 to the needle vertical movement mechanism 10 is supported in the arm portion 33 in a state along the Y-axis direction.
Pulleys are fixedly mounted on the upper shaft and the lower shaft, respectively, and are connected by a timing belt that passes through the vertical body portion 32 of the sewing machine frame 3.

(Needle vertical movement mechanism)
The needle up-and-down moving mechanism 10 includes two sewing needles 11 and 11, two needle bars each holding the two sewing needles 11 and 11 at the lower end, and each needle bar along its longitudinal direction. The upper and lower metal bearings that are slidably supported, the needle bar holder that simultaneously holds the two needle bars, the upper shaft that is rotationally driven by the spindle motor 16, and one end of the upper shaft are fixedly connected to perform rotational motion. It has a well-known configuration having a rotary weight and a crank rod having one end connected to a position eccentric from the rotation center of the rotary weight and the other end connected to a needle bar holder.

When the upper shaft is rotated, the rotating weight rotates in the same manner, one end of the crank rod performs a circular motion around the upper shaft, and the other end moves in the Z-axis direction of the circular motion of the one end. Only the needle bar is transmitted to each needle bar so that each needle bar moves up and down.
The two sewing needles 11 and 11 are arranged side by side along the Y-axis direction, and form two stitches along the X-axis direction with respect to the body cloth C conveyed along the X-axis direction. .

(Female mechanism)
The knife mechanism includes a moving knife 14 that forms a linear cut, a knife provided with the moving knife 14 at the lower end and supported so as to move up and down within the arm 33, and a drive source for moving the knife up and down. A female motor 17 (see FIG. 6), and a transmission mechanism for transmitting the rotational driving force from the female motor 17 in place of the reciprocating driving force in the vertical direction.
That is, the knife motor 17 rotates along with the feeding operation of the body cloth C, moves the moving knife 14 up and down by the transmission mechanism, and repeatedly forms cuts according to the knife width to form linear cuts.

(Hook mechanism)
The shuttle mechanism is provided in the bed portion 31 of the sewing machine frame 3. This hook mechanism has two horizontal hooks individually corresponding to the two sewing needles 11, 11, a hook gear provided on the rotating shaft of each horizontal hook, and a fixedly mounted on the lower shaft. And a transmission gear for applying a rotational driving force.
As described above, a rotational driving force is applied to the lower shaft from the output shaft of the spindle motor 16 by the timing belt. When the lower shaft is rotationally driven, the rotational driving force is transmitted to the hook gear via each transmission gear, and each horizontal hook rotates via the hook shaft. Each horizontal hook catches the sewing thread from the sewing needles 11 and 11 when the tips of the sewing needles 11 and 11 are lowered to the lower side of the needle plate 15, and rotates them to loop the sewing thread through the horizontal hook. Insert the bobbin thread to entangle the sewing thread and bobbin thread.

(Binder mechanism)
As shown in FIG. 3, the binder mechanism has a reverse T-shaped cross section, a binder 12 that is set so as to wind a ball and then sent along the longitudinal direction, and a support mechanism that supports the binder 12 so as to be movable up and down. (Not shown).
The binder 12 has an inverted T-shape when viewed in cross section from a bottom plate facing the top surface of the table 2 and a standing plate erected perpendicularly to the top surface of the flat plate.
The support mechanism includes an air cylinder (not shown) that serves as a drive source for the lifting and lowering operation of the binder 12, an electromagnetic valve 18 that drives the air cylinder (see FIG. 6), and the driving force of the air cylinder is changed to a vertical moving force. And a plurality of link bodies to be applied to the binder 12.
At the time of sewing, the binder mechanism lowers the binder 12 by the air cylinder, and the ball cloth is attached to the binder 12 so as to have a cross-sectional shape of the binder 12 in cooperation with a pair of large pressers 21 of the cloth moving mechanism 20 described later. In a state of being held so as to be wound, the ball cloth is sent out in the longitudinal direction, and sewing to the body cloth C is performed.

(Cloth movement mechanism)
As shown in FIG. 3, the cloth moving mechanism 20 includes a pair of large pressers 21 and 21 (one is not shown) that presses the body cloth C from above at positions on both sides of the sewing needles 11 and 11, and these large pressers. A support body 22 that supports the pressers 21 and 21 so as to be movable up and down, a presser air cylinder 23 that moves the large presser 21 up and down relative to the support body 22, and an electromagnetic valve 24 that controls the drive of the presser air cylinder 23 ( 6), a pressing motor 25 that moves the cloth C pressed by the large pressers 21 and 21 in the cloth feed direction, and the rotational driving force of the pressing motor 25 is converted into a linear driving force along the X-axis direction. And a ball screw mechanism 26 for transmitting to the support 22.

Each large presser 21 is a flat plate having a wedge shape in a cross-sectional view and a rectangular shape in a plan view, and each large presser 21 is supported by a support body 22 in a state where the longitudinal direction is along the X-axis direction. And it can switch to two upper and lower positions by the drive of the air cylinder 23, and when it is an upper position, it separates from the upper surface of the table 2, and descends to the upper surface height of the table 2 in a lower position.
The ball screw mechanism 26 supports the support 22 so as to be movable along the X-axis direction on the table 2, and the two large pressers 21, 21 supported by the support 22 have two sewing needles 11, 11. It is arranged to pass through both sides of the vertical movement path.

(Flap holding mechanism)
As shown in FIG. 5, the flap holding mechanism 30 holds the flap cloth sewn to the body cloth C on the upper surfaces of the large pressers 21 and 21, and is provided individually on the upper surfaces of the large pressers 21 and 21. . Each flap holding mechanism 30 includes a flap pressing member 37 that is pivotally supported by the arm member 36 so as to be able to come into contact with and away from the upper surfaces of the large pressing members 21 and 21, and an air cylinder 38 that applies rotational force to the flap pressing member 37. To hold and release the flap cloth.
The flap holding mechanism 30 is for holding the sewing cloth end portion of the flap cloth along the X-axis direction, and the sewing cloth edge portion of the flap cloth moves when the large pressers 21 and 21 move. The flap cloth is held so as to pass the needle drop position of one of the sewing needles 11 and 11. The flap cloth is held by the flap holding mechanism 30 so as to cover the reflection surface 21R of the large pressers 21 and 21 from above over the entire length in the longitudinal direction of the flap cloth.
The flap holding mechanism 30 is individually provided for each of the large pressers 21 and 21, but only one of them is selected and used during the sewing operation of the flap cloth.

(Marking irradiation device)
As shown in FIG. 4, the marking irradiation device 40 includes a first marking light 41 as a light emitting unit that irradiates the slit light P <b> 1 along the Y-axis direction downward, and the slit light P <b> 2 along the X-axis direction downward. A second marking light 42 as a light emitting unit that irradiates the X-axis, an X-axis position adjusting motor 43 as a marking light driving means for rotating and adjusting the first marking light 41 about an axis along the Y-axis direction, a sewing machine A first support portion 44 that extends from the front side of the front end of the arm portion 33 of the frame 3 toward the upstream side in the sewing direction and supports the X-axis position adjustment motor 43, and a sewing direction from the front side of the front end of the arm portion 33 And a second support 45 that extends toward the upstream side and rotatably supports the second marking light 42 around an axis along the X-axis direction.

FIG. 4 is an enlarged perspective view showing each configuration of the marking irradiation device 40. The point mark P that the marking irradiation device 40 irradiates on the upper surface of the table 2 is along the X-axis direction that the slit light P <b> 1 along the Y-axis direction that the first marking light 41 irradiates and the second marking light 42 irradiates. It consists of slit light P2. That is, the setting position of the cloth C is indicated by the intersection position of the slit light P1 and the slit light P2.
The slit light P1 along the Y-axis direction irradiated by the first marking light 41 indicates a position component in the X-axis direction at the set position, and the slit along the X-axis direction irradiated by the second marking light 42. The light P2 indicates a position component in the Y-axis direction at the set position.

  The second support portion 45 is provided with a fastening screw (not shown) for fixing and holding the second marking light 42, and the second marking is made around the axis along the X-axis direction with the fastening screw loosened. The irradiation position adjustment of the light 42 is manually performed, and the position adjustment is performed so that the slit light P2 passes through the intermediate position between the two sewing needles 11 and 11.

The first marking light 41 is rotated around the axis along the Y-axis direction by driving the X-axis position adjusting motor 43, whereby the irradiation position of the slit light P1 is moved.
The X-axis position adjusting motor 43 is a stepping motor as a marking driving means whose operation is controlled by the control device 70, and the point mark P1 is moved by moving the irradiation position of the slit light P1 along the X-axis direction by step driving. Can be moved along the cloth movement direction (X-axis direction).

With the above configuration, the marking irradiation device 40 irradiates the point mark P toward the upper surface of the table 2 in order to align the sewing start position or the sewing end position in the body cloth C.
A reference position for aligning the sewing start position (referred to as the front reference position) and a reference position for aligning the sewing end position (referred to as the rear reference position) are selected by input from the display panel 81. When the selection is made, the irradiation position of the first marking light 41 is switched so as to be the respective irradiation position by driving the X-axis position adjusting motor 43. The motor drive amount (the number of steps from the motor origin) for irradiating the slit light P1 to each of the front reference position and the rear reference position is stored in the memory 72, respectively.
Further, as will be described later, the irradiation positions of the front reference position and the rear reference position are adjusted by an input operation from the display panel 81. At this time, the irradiation position is moved by driving the X-axis position adjustment motor 43. Is done.

(Corner knife mechanism)
As shown in FIG. 3, the corner knife mechanism 50 is disposed below the table 2 and in the passage path of the large pressers 21 and 21 by the cloth moving mechanism 20, and includes a corner knife 51 including a pair of knife 51 a and 51 b. The body cloth C conveyed by the cloth moving mechanism 20 is pierced through the corner knife 51 from below to form a substantially V-shaped cut V at positions corresponding to both ends of the straight cut.
That is, the corner knife mechanism 50 includes an air cylinder 52 that moves the corner knife 51 up and down, an electromagnetic valve 53 that drives the air cylinder 52, and a drive motor 54 that moves and positions the knife 51a along the X-axis direction. ing.

The corner knife 51 has a V-shaped cross section viewed from above, and forms a V-shaped cut V by penetrating each body cloth from below.
That is, when the body cloth C and the ball cloth with the seam and the straight cut formed thereon are conveyed by the cloth moving mechanism 20 to a predetermined position downstream of the moving knife 14 in the cloth feeding direction, the corner knife is moved. The lower end of the cut is positioned and raised, and then the corner knife 51 is positioned and raised at the lower position of the other end of the cut to form two V-shaped cuts V.

(Flap detection device)
As shown in FIGS. 1 and 3, two flap detection devices 60 are provided corresponding to the reflecting surfaces 21 </ b> R provided on the large pressers 21 and 21, and in the vicinity of the jaw portion on the front side of the arm portion 33 of the sewing machine frame 3. Are arranged side by side along the Y-axis direction. Each of these flap detection devices 60 is configured so that when the flap cloth held by the flap holding mechanism 30 on the upper surfaces of the large pressers 21 and 21 is conveyed toward the two sewing needles, the end of the flap cloth (front end) And the rear end) are provided above the movement path of the large pressers 21 and 21 and upstream of the two sewing needles 11 and 11 in the cloth feeding direction.

Each flap detection device 60 has a light source 63 (see FIG. 6) as a light projecting member that irradiates visible light from the upper side of the table 2 toward the upstream side of the cloth feed direction from the needle drop position of the two sewing needles 11 and 11. A flap sensor 61 serving as a detection member that detects reflected light from the reflecting surface 21R of the large presser 21 that reflects visible light from the light source 63 and inputs a detection signal to the control device 70; A support bracket 62 that supports the flap sensor 61 on the outer surface of the arm portion 33 of the sewing machine frame 3 is provided.
The support bracket 62 supports the flap sensor 61 above the reflection surface 21R of the large presser 21 with the flap sensor 61 facing downward, and the flap detection device 60 irradiates light downward to detect the reflected light from the reflection surface 21R. It is supposed to be.

  Further, since the distance between the large pressers 21 can be adjusted along the Y-axis direction by the distance adjusting mechanism 80 (see FIG. 5), each flap sensor 61 is located on the reflective surface 21R of each large presser 21. The support bracket 62 supports the flap sensor 61 so that the position of the flap sensor 61 can be adjusted along the Y-axis direction. In other words, the support bracket 62 holds the flap sensor 61 with a long hole-shaped guide hole along the Y-axis direction (not shown) and allows the flap sensor 61 to move along the guide hole. It can be fixed with screws. Thereby, when the position between the large pressers 21 is adjusted, the position of the gap between the flap sensors 61 is also adjusted so as to be vertically above the reflecting surface 21R. Further, the support bracket 62 holds the flap sensor 61 with a long hole-shaped guide hole along the X-axis direction (not shown) and enables the flap sensor 61 to move along the guide hole, and is not fastened at an arbitrary position. It can be fixed with screws. Therefore, the support bracket 62 functions as an adjustment mechanism by a long hole-shaped guide hole formed in itself.

(Control device)
As shown in FIG. 6, the control device 70 displays various settings relating to sewing and the current sewing machine status, and also displays a screen for performing various settings, commands, and a display panel 81 for inputting numerical values. And an operation pedal 82 for inputting the start of sewing are connected via an input / output circuit (not shown).

The display panel 81 includes a display screen and a sheet-like touch sensor attached to the surface of the display screen, and detects a position touched from the outside on the surface of the sheet. The display screen displays a switch screen for performing various inputs together with the display information, and the operator can detect the switch input by touching each switch screen with a fingertip. That is, in cooperation with the display screen and the touch sensor, it functions as a touch panel type display panel 81 for selecting screens for performing various settings, inputting commands, and inputting numerical values.
Specifically, from the display panel 81, various parameters for performing the edge stitch, for example, the sewing pitch, the rotational speed of the spindle motor 16, the stitch length of the bead stitch (the cloth movement when forming the seam) The operator performs setting input such as whether the setting of the body cloth C is performed at the front reference position or the rear reference position, the position setting input of the front reference position or the rear reference position, and the like.

  The operation pedal 82 can be stepped in a multistage manner, and the point mark P is irradiated when the operation pedal 82 is stepped down to the first step. Further, when the second stage is stepped on, the presser air cylinder 23 is activated and the large pressers 21 and 21 at the upper position are lowered to the lower position, and the cloth C and the drape set on the table 2 (these And the fabric held by the large pressers 21 and 21 are transported in the cloth feeding direction by driving of the presser motor 25. Further, when the third stage is stepped on, the presser air cylinder 23 is operated only in the later-described marking light adjustment mode, and the large pressers 21 and 21 at the lower position are raised to the upper position to release the fabric. .

The control device 70 is connected to a spindle motor 16, a presser motor 25, a knife motor 17, a corner knife drive motor 54, and an X-axis position adjustment motor 43 that are to be controlled.
Further, the control device 70 includes an electromagnetic valve 18 of an air cylinder that moves the binder 12 up and down, an electromagnetic valve 24 of an air cylinder 23 for raising and lowering the large pressers 21 and 21, and an air cylinder that raises and lowers the corner knife 51. The solenoid valve 53 of 52 and the solenoid valve 39 of the air cylinder 38 which moves the flap pressing member 37 up and down are connected.
Furthermore, a first marking light 41 and a second marking light 42 of the marking irradiation device 40, a flap sensor 61 of the flap detection device 60, and a light source 63 are connected to the control device 70.

The control device 70 includes a CPU 71 that performs various types of control, and a memory 72 that stores various types of control programs and can rewrite data.
The memory 72 stores various parameters (sewing pitch, rotational speed of the spindle motor 16, sewing length of the edge stitch (cloth moving mechanism for forming the stitches) inputted from the display panel 81 for performing the edge stitching. 20), data indicating whether the point mark P1 is irradiated to the front reference position or the rear reference position, operation position information for irradiating the front reference position, and irradiation of the rear reference position. Operation position information, selection mode data indicating which of two types of sewing modes described later is selected, data indicating the arrangement and operation amount of the sewing needles 11, 11, moving knife 14, corner knife 51, 52 (illustrated) In addition, the end of the flap cloth is detected by the flap detection device 60 after the end of the flap cloth is detected by the flap detecting device 60 in the memory 72. Feed length of the flap to reach (the L0 also R0 · · · detailed later) is stored. That is, the memory 72 functions as a feed length storage means.

  In the memory 72, a unit amount drive for moving the point mark P1 in the cloth feeding direction by driving the X-axis position adjusting motor 43 by a predetermined unit amount in response to a command signal output to an operation input from the display panel 81 by the user. A command control signal output program 72a for outputting a signal is stored. That is, when the CPU 71 executes the command control signal output program 72a, the control device 70 drives the X-axis position adjustment motor 43 based on the command signal output from the operation panel to move the point mark P1. Functions as a means. Here, driving the X-axis position adjusting motor 43 by a predetermined unit amount means a driving amount of the X-axis position adjusting motor 43 required when the first marking light 41 is rotated by a certain unit angle. .

Specifically, as shown in FIG. 7, when an operation input from the display panel 81 by the user, for example, when the flap sensor adjustment mode is entered by pressing the flap sensor adjustment key, the display panel 81 displays a, b, Among the display groups indicated by c, a left selection key 83 that is selected when adjusting the left flap sensor among the two left and right flap sensors, and a right selection key 84 that is selected when adjusting the right flap sensor, Only the display group a showing is displayed. Here, when the user touches either the left selection key 83 or the right selection key 84, one of the display groups (one of the display groups b and c) corresponding to the touched selection key is touched. Is displayed below the selection key. That is, when the user touches the left selection key 83, the display group b is displayed below the left selection key 83, and when the user touches the right selection key 84, the display group c is displayed below the right selection key 84. . In the display groups b and c, position adjustment keys 85 and 86 for performing an input for driving the X-axis position adjustment motor 43 by a predetermined unit amount are displayed in the display groups. Further, on the display panel 81, the position adjustment keys 85 and 86 are operated to drive the X-axis position adjustment motor 43, and the irradiation position of the point mark P1 coincides with the irradiation point at which the visible light of the light source 63 projects the table 2. At this time, a confirmation key 87 for outputting a coincidence signal when operated is displayed. Here, the position adjustment key 85 is used when the point mark by the first marking light 41 is moved downstream in the cloth feeding direction, and the position adjustment key 86 is used by moving the point mark by the first marking light 41 in the cloth feeding direction. Used when moving upstream.
Therefore, the user can select the flap sensor to be adjusted from the left and right flap sensors displayed in FIG.
Accordingly, the position adjustment keys 85 and 86 function as movement command output means for outputting a command signal for moving the point mark P1 along the feed direction by operation, and the confirmation key 87 functions as coincidence signal output means.

The memory 72 also includes a drive amount of the X-axis position adjustment motor 43 for making the irradiation position of the point mark P1 coincide with the irradiation point at which the visible light of the light source 63 projects the table 2 when the enter key 72 is operated. Is stored in a memory 72 as drive information storage means as drive information.
The memory 72 also stores a marking light drive control program for driving the X-axis position adjustment motor 43 based on the stored drive information. Then, when the control device 70 executes the marking light drive control program, the X-axis position adjustment motor 43 is driven so that the point mark P1 coincides with the irradiation point at which the visible light of the light source 63 appears on the table 2. That is, the memory 72 and the control device 70 constitute a marking light drive control unit.
Further, in the memory 72, based on the stored drive information, a feed length (L0) for conveying the flap end to the needle drop position of the sewing needles 11 and 11 after the flap end is detected by the flap detecting device 60. Alternatively, a correction program 72c for correcting R0) is stored. That is, when the CPU 71 executes the correction program 72c, the control device 70 functions as a correction unit.
Further, the memory 72 determines the sewing start position or the sewing end position by the needle vertical movement mechanism 10 based on the detection signal from the flap sensor 61 and the corrected feed length (L0), and the spindle motor 16, cloth A control program 72c for controlling the moving mechanism 20 and the needle up-and-down moving mechanism 10 to sew the flap cloth on the body cloth C and the ball cloth is stored. That is, when the CPU 71 executes the control program 72c, the control device 70 functions as a control unit.

(Flap sensor sewing start (end) timing correction method)
Next, a method of correcting the flap cloth sewing start (end) time by the flap sensor will be specifically described.
As shown in FIG. 8, the control device 70 determines whether or not the adjustment mode of the flap sensor 61 has been switched, that is, whether or not a mode switching switch (not shown) displayed on the operation panel 81 has been pressed (step). S1). Here, when the control device 70 determines that the mode switch is not pressed (step S1: NO), the control device 70 makes this determination again. On the other hand, when the control device 70 determines that the mode change switch has been pressed (step S1: YES), the control device 70 displays the adjustment mode screen of the flap sensor 61 shown in FIG. 7 on the display panel 81 (step S2). ).

Next, the control device 70 determines whether or not any of the left and right selection keys 83 and 84 has been pressed, and if it has been determined that it has been pressed, determines which of the selection keys has been pressed (step S3). .
Here, when the control device 70 determines that the left and right selection keys 83 and 84 are not pressed (step S3: NO), the control device 70 determines whether or not the end key 88 (see FIG. 7) is pressed. Is determined (step S9), and when the control device 70 determines that the end key 88 is pressed (step S9: YES), the control device 70 ends the process.

  On the other hand, if the control device 70 determines that the left selection key 83 has been pressed, that is, determines that the left flap sensor 61 is to be adjusted (step S3: YES (left)), the process proceeds to step S4, and the memory 72, the X-axis position adjusting motor 43 is controlled based on the feed length L0 for conveying the flap end to the needle drop position of the sewing needles 11 and 11 after the flap end with respect to the left flap sensor 61 is detected. The first marking light 41 is driven to rotate and irradiate the point mark P1 to the position before the needle drop position of the sewing needles 11 and 11 in the cloth feeding direction of L0, and the display group b is left selected on the display panel 81. It is displayed below 83.

This X-axis position adjustment motor is driven by feeding the flap until the end of the flap cloth reaches the needle drop position M1 of the sewing needles 11 and 11 after the end of the flap cloth is detected by the flap sensor 61 on the left side. The length L0 and drive information of the X-axis position adjustment motor 43 that irradiates the point mark P1 so as to coincide with the position M2 corresponding to the stored feed length L0 are stored in the memory 72. This is executed by controlling the X-axis position adjusting motor 43 based on the stored drive information.
In FIG. 9, the irradiation angle θ of the marking light 41 is stored as drive information of the X-axis position adjustment motor 43, and the X-axis position adjustment motor 43 is driven based on the irradiation angle θ. The state where the irradiation light shown with the broken line is output toward the irradiation point M2 is shown. Note that the irradiation angle θ of the marking light 41 is a rotation angle from a predetermined origin of the X-axis position adjustment motor 43. In FIG. 9, the irradiation of the point mark P1 to the point M1 directly below the marking light 41 in FIG. The rotation angle is the origin.

  In step S4, if the attachment position of the flap detection device 60 is accurate, the irradiation position of the light source 63 and the irradiation position of the first marking light 41 coincide. However, for example, when the interval of the flap detection device 60 is adjusted with the adjustment of the interval between the large pressers 21 and shifted to the irradiation point M3 in FIG. 9, the irradiation position of the light source 63 and the first marking light 41 There is a deviation from the irradiation position. In this case, it is necessary to correct the sewing start (end) timing of the flap cloth according to the amount of deviation between the two.

  Here, there are two methods for correcting the deviation of the irradiation point of the flap detection device 60. One is a method of mechanically adjusting the attachment position of the flap detection device 60 so that the irradiation position M2 of the first marking light 41 coincides with the irradiation point of the flap detection device 60. That is, since the irradiation position M2 of the first marking light 41 coincides with the irradiation point of the flap detection device before the position adjustment, the operator can set the irradiation point of the light source 63 to the irradiation position of the first marking light 41. By adjusting the position of the flap detection device 60 so as to coincide with the above, it is possible to detect the flap cloth at an accurate position. In this method, when the correction of displacement is completed, the operator presses the confirmation key 87 (step S9: YES), and further presses the end key 88 (step S10: YES), thereby the correction program 72c is ended. .

  As another correction method of the deviation of the flap detection device 60, the mechanical position adjustment of the flap detection device 60 is not performed, and the detection position of the flap end is detected by the flap detection device 60 stored in the memory 72. This is a method of correcting the feed length L0 for conveying the flap end portion to the needle drop position of the sewing needles 11 and 11 based on the detection position of the current flap detection device 60. The feed length L0 is corrected by making the irradiation point P1 of the marking light 41 coincide with the irradiation point M3 of the light source 63 of the flap detection device 60 by the key operation of the operator's operation panel 81. Based on the drive information (drive amount or drive position) of the position adjustment motor 43, the control for correcting the feed length L0 will be described below.

  After step S4, the control device 70 performs key operations performed by the operator to match the irradiation point P1 with the irradiation point M3 among the position adjustment keys 85 and 86 displayed as the display group b, that is, a first operation. It is determined whether or not the position adjustment key 85 for moving the irradiation light of the marking light 41 in the forward direction has been pressed (step S5). Here, the movement in the positive direction means that the irradiation light of the first marking light 41 is moved in a direction approaching the needle drop position M1 (left direction in FIG. 9).

When the control device 70 determines that the position adjustment key 85 has been pressed (step S5: YES), the control device 70 sets the cloth feed length L0 by one operation (Rf) of the position adjustment key 85. Correction is performed (step S6). Here, the correction of L0 is obtained by the following equation (1).
L0 = L0−Rf (1)
Here, as shown in FIG. 7, Rf indicates the distance by which the irradiation light of the first marking light 41 moves along the upper direction of the sewing machine table when the position adjustment key 85 is pressed once, and the position adjustment key When 85 is pressed n times, the amount of movement of the irradiation light of the first marking light 41 is nRf.

After calculating the corrected cloth feed length L0 in step S6 or when the control device 70 determines in step S5 that the position adjustment key 85 has not been pressed (step S5: NO), the control device 70 Of the position adjustment keys 85 and 86 displayed as the display group b, it is determined whether or not the position adjustment key 86 for moving the irradiation light of the first marking light 41 in the negative direction has been pressed (step S7). Here, the movement in the negative direction means that the irradiation light of the first marking light 41 is moved in a direction away from the needle drop position M1 (right direction in FIG. 9).
When the control device 70 determines that the position adjustment key 86 has been pressed (step S7: YES), the control device 70 sets the cloth feed length L0 by one operation (Rf) of the position adjustment key 86. Correction is performed (step S8). Here, Lc is obtained by the following equation (2).
L0 = L0 + Rf (2)

  After the calculation of L0 in step S8 or when the control device 70 determines in step S7 that the position adjustment key 86 has not been pressed (step S7: NO), the control device 70 causes the point mark P1 by the operator. Is determined to coincide with the irradiation point M3 of the flap detection device 60, and it is determined whether or not the confirmation key 87 indicating that the correction of the cloth feed length L0 has been completed has been pressed. If the confirmation key 87 has not been pressed yet, the process returns to step S4, and the point mark P1 is irradiated to the position where the distance from the needle drop position 11, 11 becomes the feed length L0 corrected in steps S5-8. Thus, the X-axis position adjustment motor 43 is driven. Then, the cloth feed length L0 is corrected based on the irradiation angle θ1 of the marking light 41 shown in FIG. 9 as drive information of the X-axis position adjusting motor 43 at this time. In step S4, the display of the display group b is maintained as it is.

  On the other hand, the control device 70 determines that the operator determines that the point mark P1 coincides with the irradiation point M3 of the flap detection device 60 by the control in step S4 based on the operations in steps S5 to S8, and the confirmation key 87 is pressed. If it is determined (step S9: YES), the process proceeds to step S10 to determine whether or not the end key 88 is pressed.

  Next, when the control device 70 determines that the end key 88 has been pressed (step S10: YES), the control device 70 ends this process. On the other hand, if control device 70 determines that end key 88 has not been pressed (step S10: NO), control device 70 returns to the determination in step S3.

In the control of step S4 immediately before the confirmation key 87 is pressed in step S9 described above, the final corrected feed length L0 is determined by the following processing.
That is, as shown in FIG. 9, the distance from M4 directly below the first marking light 41 to M2 directly below the light source 63 is set to L, and the height position of the first marking light 41 is stored in the memory 72 in advance. In this case, the movement distance nRf of the point mark P1 when the point mark P1 coincides with the irradiation point M3 when the position adjustment keys 85 and 86 are finally pressed n times is represented by nRf = L−L1. The rotation angle with respect to the vertical direction of the first marking light 41 when the first marking light 41 is irradiating M2 is θ, and the first angle when the first marking light 41 is irradiating M3. If the rotation angle of the marking light 41 with respect to the vertical direction is θ1, nRf = L−L1 = H (tan θ−tan θ1)
Therefore, the corrected feed length L0 can be obtained from the following equation (3) based on the obtained distance nRf.
L0 = L0 + nRf (3)
Although the above description has been made on the case of obtaining the final feed length L0, in step S4, the same calculation is performed every time the position adjustment keys 85 and 86 are pressed.

In step S3, if the control device 70 determines that the right selection key 84 is pressed, that is, if it determines that the right flap sensor 62 is to be adjusted, the flap for the left flap sensor 61 stored in the memory 72 is determined. The first marking light 41 is rotated by driving the X-axis position adjusting motor 43 based on the feed length R0 that conveys the flap end to the needle drop position of the sewing needles 11, 11 after the end is detected. The point mark P1 is irradiated from the needle drop position of the sewing needles 11 and 11 to a position before the cloth feed direction of R0, and the display group c is displayed below the left selection key 83 on the display panel 81 (step S11).
Since Steps S11 to S16 after Step S11 are the same processing as Steps S4 to S9, description thereof will be omitted.

  In step S4, the distance Rf that the point mark moves when the position adjustment keys 85 and 86 are pressed once is the distance Rf from the first marking light 41 even if the first marking light 41 is rotated by the same angle. It differs depending on the incident angle of the irradiated light to the flap cloth. Therefore, the rotation angle of the first marking light 41 when the position adjustment keys 85 and 86 are pressed once is the same distance Rf that the point mark moves when the position adjustment keys 85 and 86 are pressed once. Therefore, it is set in advance according to the attitude of the first marking light 41. This data is stored in the memory 72 of the control device 70.

(Sewing with a hem-sewing machine)
Next, a sewing procedure using the edge stitch sewing machine 1 will be described.
As shown in FIG. 10, the control device 70 determines whether or not a feed start signal for starting the feeding of the ball and cloth is received from the flap detection device 60 (step S31). Here, when the control device 70 determines that the feed start signal has been received from the flap detection device 60 (step S31: YES), the control device 70 moves the large pressers 21 and 21 (step S32). On the other hand, when the control device 70 determines that the feed start signal has not been received from the flap detection device 60 (step S31: NO), the control device 70 repeats the determination in step S31.

  Next, the control device 70 determines whether or not the flap detection device 60 has detected the front end of the flap cloth (step S33). Here, when the control device 70 determines that the flap detection device 60 has detected the front end of the flap cloth (step S33: YES), the control device 70 determines that the feed length of the flap cloth by the large pressers 21 and 21 is L0. It is determined whether or not (step S34). On the other hand, when the control device 70 determines that the flap detection device 60 has not detected the front end of the flap cloth (step S33: NO), the control device 70 repeats the determination in step S33.

  In step S34, when the control device 70 determines that the flap cloth feed length by the large pressers 21 and 21 is L0 (step S34: YES), the control device 70 transmits a drive signal to the sewing machine motor or the like. Ball edge sewing is started (step S35). Further, the control device 70 rotates the knife motor 17 together with the body cloth feeding operation, moves the moving knife 14 up and down by the transmission mechanism, repeatedly forms a cut according to the knife width, and forms a straight line cut on the cloth. To form.

  After starting the sewing, the control device 70 determines whether or not the flap detection device 60 has detected the trailing edge of the flap cloth (step S36). Here, when the control device 70 determines that the flap detection device 60 has detected the trailing edge of the flap cloth (step S36: YES), the control device 70 determines that the feed length of the flap cloth by the large pressers 21 and 21 is large. It is determined whether or not L0 (step S37). On the other hand, when the control device 70 determines that the flap detection device 60 has not detected the front end of the flap cloth (step S36: NO), the control device 70 repeats the determination in step S36.

  In step S37, when the control device 70 determines that the feed length of the flap cloth by the large pressers 21 and 21 is L0 (step S37: YES), the control device 70 transmits a drive stop signal to the sewing machine motor or the like. Then, the edge stitching is stopped (step S38). Further, the control device 70 drives the corner knife mechanism 50 at the end of the body cloth feeding operation, positions and raises the corner knife 51 at a lower position on one end side of the cut, and then lowers on the other end side of the cut. The corner knife 51 is positioned and raised at the position, and two V-shaped cuts V are formed. With this, the edge stitching is finished.

(Effect of embodiment)
As described above, according to the edge stitch sewing machine 1, when the user operates the display panel 81 to output a command signal for moving the point mark along the feed direction by the control device 70, this is output. Based on the command signal, the X-axis position adjustment motor 43 is driven, and the point mark moves.
Here, the control device 70 moves the point mark so as to coincide with the irradiation position of the visible light of the light source 63 by executing the measurement program 72b. Then, the control device 70 executes the correction program 72c to correct the feed length L0 based on the drive information when the point mark is moved.
As a result, even if the flap detection device 60 is not accurately positioned or fixed to the sewing machine frame 3, the X-axis position adjustment motor 43 is driven to determine the irradiation position of the first marking light 41. Since it can be made to coincide with the actual irradiation point of visible light of the light source 63, the feed length L0 is corrected based on the driving information of the first marking light 41 at that time, and sewing can be performed. Sewing can be performed, and deterioration of the quality of the workpiece can be prevented.

(Other)
The present invention is not limited to the above embodiment.
For example, in the above embodiment, each time the position adjustment keys 85 and 86 are pressed once, the first marking light 41 is configured to rotate by a set angle. You may comprise so that the 1st marking light 41 may rotate continuously by continuing pushing.

The perspective view which shows schematic structure of a ball stitch sewing machine. The perspective view which shows schematic structure of a ball stitch sewing machine. The front view which shows schematic structure of a ball stitch sewing machine. The expansion perspective view of a marking irradiation apparatus. The perspective view of a cloth movement mechanism. The block diagram which shows schematic structure regarding control of a bead stitch sewing machine. The figure which shows the example of a display of a display panel. The flowchart which shows the process of the correction method of the detection timing of the flap cloth by a flap sensor. The schematic diagram explaining correction | amendment of the irradiation position of a point mark. Flowchart of bead stitching.

Explanation of symbols

1 Sewing machine 2 Table (work table)
10 Needle up-and-down movement mechanism 16 Spindle motor 20 Cloth movement mechanism 21 Large presser 30 Flap holding mechanism 40 Marking irradiation device 41 First marking light (light emitting portion)
42 Second marking light (light emitting part)
43 X-axis position adjustment motor (marking drive means)
60 flap detection device (flap detection means)
61 Flap sensor (detection member)
62 Support bracket (adjustment mechanism)
63 Light source (light projecting member)
70 Control device (control means, operation means, measurement means, correction means, marking light control means, coincidence signal output operation means)
72 Memory (memory means)
81 Display panel (operation means)
C Body cloth (cloth)
P point mark

Claims (2)

A needle up-and-down moving mechanism that has two sewing needles that are moved up and down by a spindle motor and forms two parallel stitches by moving up and down the two sewing needles;
A cloth movement mechanism that conveys the fabric by holding the cloth on the work table from above by a pair of large presses extending in the transport direction of the fabric and moving the large press in the transport direction;
A flap holding mechanism for holding a flap cloth to be sewn on the fabric on the upper surface of the large presser;
A light emitting unit that irradiates the cloth with a point mark serving as a positioning reference when the cloth is arranged on the work table, and a marking driving unit that moves the irradiation position of the point mark along the cloth feeding direction. Marking irradiation device;
Formed on the upper surface of the light projecting member that irradiates visible light from above the workbench toward the upstream of the cloth feeding direction from the needle drop position of the two sewing needles, and along the longitudinal direction of the large presser The flap holding mechanism, comprising: a detection member that detects reception of reflected light from a reflecting surface that reflects the visible light; and an adjustment mechanism that holds the light projecting member so that the position of the light projecting member can be adjusted along the cloth feeding direction. Flap detecting means for detecting the front and rear ends of the flap cloth held by
A feed length storage means for storing the feed length of the flap from when the end of the flap cloth is detected by the flap detection means until the flap end reaches the needle drop position of the two sewing needles; ,
Based on a detection signal from the flap detection signal and the stored feed length, a sewing start timing or a sewing end timing by the needle vertical movement mechanism is determined, and the cloth movement mechanism and the needle vertical movement mechanism are controlled. Control means for sewing a flap cloth to the cloth, and a ball stitch sewing machine comprising:
A movement command output means for outputting a command signal for moving the point mark along the feed direction by an operation;
Command control means for moving the point mark by driving the marking drive means based on the command signal;
A coincidence signal output means for outputting a coincidence signal by being operated when a point mark moved based on the command signal coincides with an irradiation point at which visible light of the light projecting member is projected on the worktable;
Correction means for correcting the stored feed length based on driving information of the marking driving means when the coincidence signal is output;
An edge stitch sewing machine characterized by comprising A needle up-and-down moving mechanism that has two sewing needles that are moved up and down by a spindle motor and forms two parallel stitches by moving up and down the two sewing needles;
A cloth movement mechanism that conveys the fabric by holding the cloth on the work table from above by a pair of large presses extending in the transport direction of the fabric and moving the large press in the transport direction;
A flap holding mechanism for holding a flap cloth to be sewn on the fabric on the upper surface of the large presser;
A light emitting unit that irradiates the cloth with a point mark serving as a positioning reference when the cloth is arranged on the work table, and a marking driving unit that moves the irradiation position of the point mark along the cloth feeding direction. Marking irradiation device;
A light projecting member that irradiates visible light from above the work table toward the upstream of the cloth feeding direction from the needle drop position of the two sewing needles, and a longitudinal direction of the large presser provided with the light projecting member on the lower surface A detection member that detects reception of reflected light from a reflection surface that reflects the visible light formed on the upper surface thereof, and an adjustment mechanism that holds the detection member so that the position of the detection member can be adjusted along the cloth feeding direction. Flap detecting means for detecting an end of the flap cloth held by the flap holding mechanism,
Feed length storage for storing the feed length of the flap from when the end of the flap cloth is detected by the flap detection means until the end of the flap cloth reaches the needle drop position of the two sewing needles Means,
Based on a detection signal from the flap detection signal and the stored feed length, a sewing start timing or a sewing end timing by the needle vertical movement mechanism is determined, and the cloth movement mechanism and the needle vertical movement mechanism are controlled. Control means for sewing a flap cloth to the cloth, and a ball stitch sewing machine comprising:
Drive information storage means for storing drive information for driving the marking drive means so that the point mark of the marking irradiation device matches an irradiation point at which visible light of the light projecting member is projected on the worktable;
An edge stitch sewing machine comprising: marking light drive control means for driving the marking drive means based on the drive information stored in the drive information storage means.

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