JP2009106643A - Binding sewing machine and its sewing reference position specification method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly perform sewing for a flap cloth. <P>SOLUTION: This binding sewing machine includes a pair of needle bars 72 executing vertical movement, a needle vertical movement mechanism 70 for changing over between both-needle driving and one-needle driving, a pair of clamp feet 41, a flap holding mechanism 55 for holding the flap cloth F, a cloth feed mechanism 40 for moving the clamp feet, reflection portions 41c and 41d for detecting the end and formed on the upper faces of the respective clamp feet, flap sensors 30 and 35 receiving reflected lights from the respective reflection parts, a section length computing means finding the cloth-feed-directional length of a state change causing the state change of the reflected light by the flap sensors, by indication members 100 installed on the clamp feet, and a sensor detection position specification means for specifying the detection position of the flap sensors based on the position of the clamp feet when starting or finishing the detection of the state change section and the cloth feed directional length of the state change section, wherein a sewing control means 60 executes sewing while reflecting the detection positions of the flap sensors specified by the sensor detection position specification means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an edge stitch sewing machine that detects a flap cloth end by detecting reflected light.

  The bead stitch is generally a sewing method applied to the opening of a pocket of clothing, and the sewing of the bead is performed like a valve that closes the opening of the square opening. Further, in ball edge stitching, a flap fabric that hangs down from a gap in a ball cloth that closes a pocket opening like a valve is often sewn. Such a flap cloth is generally rectangular in shape with a width substantially equal to the pocket opening, but the pocket opening is formed obliquely, and the flap cloth is also formed in a substantially parallelogram shape accordingly. Is also present.

  A conventional sew-on-sewing machine is conveyed with a large pressing mechanism having a pair of large presses that hold and convey the body cloth on the mounting table together with the ball cloth, and a flap holding mechanism that holds the flap cloth on the large presses. Sewing means for performing sewing on the fabric to be sewn, and a flap sensor for detecting reflected light from the reflecting surface formed on the upper surface of the large presser along the cloth feeding direction of the fabric (for example, Patent Document 1). reference).

On one large presser, two rows of reflecting surfaces are formed along the cloth feeding direction, and two flap sensors are provided side by side along the direction orthogonal to the cloth feeding direction. When sewing a rectangular flap cloth (referred to as “normally flap cloth”), only one flap sensor and the reflector are used, and the large presser is conveyed while the flap cloth is placed. Since the flap cloth shields the reflecting surface, the light intensity change of the reflected light is detected by the flap sensor.
When such a change in light intensity is detected, it means that the flap end is located at the detection position of the flap sensor, so that a specified value (a distance between the flap sensor and the sewing needle) is increased from the detection point of the light intensity change. Control to start sewing from the flap end by moving the presser and starting sewing (strictly, an offset value is input to the distance between the flap sensor and the sewing needle, and slightly before the flap end. Start sewing). The same applies to the end of sewing.

In the case of a parallelogram-shaped flap cloth (referred to as “oblique flap cloth”), two rows of reflective surfaces and two flap sensors are used. In this case, the point that the large presser is moved by the specified value from the time of detection of one flap sensor and sewing is started is the same, but further, the difference in the position of the large presser at the time of detection by the two flap sensors causes the end of the flap. Processing for obtaining a deviation between the sewing start positions (or sewing end positions) of the two seams based on the inclination angle is added.
Japanese Patent No. 2716970

However, in the above-mentioned conventional sewing machine, since the control is performed to start or end the sewing after the feed of the specified value from the detection of the flap end by the flap sensor, the flap sensor is accurately attached in the cloth feed direction. Otherwise, there is a problem in that the sewing start and end positions are deviated and the sewing quality is deteriorated.
Furthermore, in the case of an oblique flap cloth, not only the cloth feed direction but also the direction orthogonal to the cloth feed direction is accurately attached in order to obtain the inclination angle of the flap end from the difference between the detection positions of the two flap sensors. Otherwise, the deviation of the two seams based on the inclination angle of the flap end cannot be accurately obtained, and the start and end positions of the two seams are distorted, resulting in a problem that the sewing quality is deteriorated. there were.
It is also possible to measure the actual attachment position instead of attaching the flap sensor accurately, and input the measured value from the operation panel etc. and change the position data related to the flap sensor stored in the control means. In addition, it is difficult to measure the attachment position of the flap sensor, and even if the attachment position is measured accurately, the light emitted from the sensor is not always emitted directly underneath it. Therefore, it was necessary to adjust the attachment position of the flap sensor repeatedly and patiently, so that the nerve concentration was required for a long time, the workability was poor, and the burden on the operator was great.

  An object of the present invention is to improve the sewing quality.

  According to the first aspect of the present invention, a pair of left and right needle bars that individually hold sewing needles and move up and down by a sewing machine motor, a needle up-and-down movement mechanism that moves the needle bars up and down, and a body cloth on a mounting table A pair of left and right large pressers that hold the ball together with the ball cloth, a flap holding mechanism that is provided on at least one of the large pressers and holds the flap cloth on the upper surface of the large presser, and the pair of large pressers for a predetermined cloth A cloth feed mechanism that moves along the feed direction, a reflector for detecting a flap end formed along the cloth feed direction on an upper surface of at least one large press provided with the flap holding mechanism, and the reflector A flap sensor that receives the reflected light and detects an end portion of the flap cloth by a change in a detection state of the reflected light by the flap cloth, and the flap sensor In an edge stitch sewing machine comprising sewing control means for performing sewing control by determining a sewing start or end position of the large presser based on a position in the cloth feed direction of the large presser when a change in the detection state of the light occurs And a state change section that causes a state change of the reflected light detected by the flap sensor as the large presser moves along the cloth feed direction, and the length of the state change section in the cloth feed direction is When the index member that causes a specific change depending on the position in the direction orthogonal to the cloth feed direction is installed at a specified position on the large presser, the large presser is moved in the direction along the cloth feed direction to thereby flap the flap. Section length calculation means for obtaining the cloth feed direction length of the state change section in which the state change of the reflected light by the sensor has occurred, and detection start of the state change section or Sensor detection position specifying means for specifying the detection position of the flap sensor from the position of the large press at the end and the cloth feed direction length of the state change section, and the sewing control means is for sewing the flap cloth. In this case, the sewing start or end position is determined by reflecting the detection position of the flap sensor specified by the sensor detection position specifying means.

The “inherent change” of the index member means any length in the direction in which the cloth feed direction length of the passage locus when the irradiation light from the sensor passes through the state change section is perpendicular to the cloth feed direction. If the position in the direction orthogonal to the cloth feed direction is different, the length of the cloth trajectory in the passage trajectory will always be different, and the direction orthogonal to the cloth feed direction. This shows a case where the cloth feed direction lengths of the passage trajectories are not equal even though the positions at are different. The same applies to other claims.
Further, the “detection position of the flap sensor” indicates a position (light irradiation position) at which the flap sensor detects the reflection part.

  The invention described in claim 2 has the same configuration as that of the invention described in claim 1, and a plurality of the reflection portions and flap sensors are provided for at least one of the large pressers.

  The invention according to claim 3 is a pair of left and right needle bars that individually hold sewing needles and move up and down by a sewing motor, a needle up-and-down movement mechanism that moves the needle bars up and down, and a body cloth on the mounting table. A pair of left and right large pressers that hold the ball together with the ball cloth, a flap holding mechanism that is provided on at least one of the large pressers and holds the flap cloth on the upper surface of the large presser, and the pair of large pressers for a predetermined cloth A cloth feed mechanism that moves along the feed direction, a reflector for detecting a flap end formed along the cloth feed direction on an upper surface of at least one large press provided with the flap holding mechanism, and the reflector A flap sensor that receives the reflected light and detects an end portion of the flap cloth by a change in a detection state of the reflected light by the flap cloth, and the flap sensor A sewing machine having sewing control means for performing sewing control by determining a sewing start or end position of the large presser based on a position in the cloth feed direction of the large presser when a change in the detection state of the light occurs. The sewing reference position specifying method includes a state change section that causes a state change of reflected light detected by the flap sensor as the large presser moves along the cloth feed direction, and the cloth in the state change section An installation step of installing an index member whose length in the feeding direction is inherently changed depending on a position in a direction orthogonal to the cloth feeding direction at a predetermined position on the large presser, and a direction along the cloth feeding direction of the large presser A state where a large pressing position at the start or end of detection of the state change section and a state change of reflected light by the flap sensor are generated. Detection position of the flap sensor from the section length calculation step for obtaining the cloth feed direction length of the control section, the position of the large press at the start or end of detection of the state change section, and the cloth feed direction length of the state change section A sensor detection position specifying step for specifying the sewing position, and a sewing reference position specifying step for determining a sewing start or end position at the time of sewing reflecting the detection position of the flap sensor specified in the sensor detection position specifying step. Features.

In the invention according to claim 1 or 3, since the indicator member has a state change section, the indicator member is installed at a known position on the large presser and the state change section is detected, so that the flap sensor is detected from the detected position. It is possible to specify the actual detection position in the cloth feed direction.
Furthermore, since the cloth feed direction length of the state change section of the index member shows a specific value depending on the position in the direction orthogonal to the cloth feed direction, it is obtained by installing the index member on a large press and performing detection by the flap sensor. If the cloth feed direction length of the state change section is detected, it is automatically adjusted in the direction perpendicular to the cloth feed direction of the flap sensor without actually adjusting the attachment position of the flap sensor or measuring the attachment position. It becomes possible to specify the actual detection position.

Accordingly, the actual detection position in the cloth feed direction of the flap sensor and the actual detection position in the direction crossing the cloth feed direction are obtained from these, and the sewing control is performed on the assumption that it is in the detection position. It is possible to perform sewing at the sewing start position and the sewing end position, and to improve the sewing quality.
In addition, as described above, the detection position of the flap sensor can be obtained accurately without actually adjusting the attachment position of the flap sensor or measuring the attachment position, and sewing can be performed accordingly. Therefore, it is possible to eliminate the need for highly accurate sensor mounting work and position adjustment work in advance, and to reduce the work load.
Further, in the sewing control after the sensor is attached or the position is adjusted, the operation for correcting various parameters becomes unnecessary, the work load can be reduced, and the maintainability can be improved.

  In the invention of claim 2, since a plurality of flap sensors are provided for at least one large presser, it is possible to sew an oblique flap cloth, and each flap sensor is orthogonal to the detected position in the cloth feed direction and the cloth feed direction. By detecting the detection positions in the direction to be performed and performing the sewing control on the assumption that each detection position is present, it is possible to perform sewing at the accurate sewing start position and sewing end position for both of the two stitches. It is possible to improve the sewing quality.

(Sewing edge)
A bead stitch sewing machine 10 according to the present embodiment described below is a sewing machine for performing bead stitching. First, the edge stitching will be described with reference to FIG. FIG. 1 is a plan view showing a state immediately after sewing of the edge stitch.
The edge stitch is a sewing method for forming the opening of the pocket. The pocket opening has a rectangular shape and a parallelogram shape, but here the parallelogram shape is taken as an example. explain. Note that the bead stitch sewing machine 10 can also sew a pocket having a rectangular opening.

The ball edge stitching is formed by placing the ball cloth T on the surface of the body cloth C, placing the flap cloth F thereon, and stitching it together with the two stitches N and N. Further, a straight cut L is formed between the two stitches N, N in parallel with the stitches N, N, and V-shaped cuts V, V are formed at both ends of the straight cut L. Is formed.
The flap cloth F has one side edge portion sewn to the body cloth C together with the ball cloth T by one seam N.
The V-shaped cuts V and V are formed so as to coincide with a line segment connecting the end of the straight cut L and the ends of the two seams N and N.
Then, as shown in FIG. 1, the seam N and the cuts L and V are formed, and the ball cloth T is folded from the cuts L and V to the back side of the body cloth C, and the flap cloth F is indicated by a two-dot chain line. In the state where the seam N is inverted about the axis, the pocket hangs outward from the opening of the pocket.
At this time, the opening of the pocket has a parallelogram shape with the four points at both ends of the two seams as vertices. And the flap cloth F is set so that it may just cover the parallelogram-shaped opening part in the inverted state. That is, the end of the two seams N, N so that the inclination angle at both ends in the longitudinal direction of the flap cloth F coincides with the inclination angle of the line segment connecting the ends of the two seams N, N. The position is offset in the cloth feed direction. In the following description, the offset amount is referred to as an end position deviation DS of the seam (see FIGS. 10 and 11).

(Overall configuration of the embodiment of the invention)
Hereinafter, a bead stitch sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view showing an overall schematic configuration of the edge stitch sewing machine 10, and FIG. 3 is a front view of the edge stitch sewing machine 10. In the present embodiment, the direction of each part of the sewing machine 10 is determined based on the XYZ axes shown in the drawings. In the state where the sewing machine 10 is installed on the horizontal plane, the Z-axis direction indicates the vertical direction, the X-axis direction indicates the horizontal and the direction corresponding to the cloth feeding direction E, the Y-axis direction is horizontal and orthogonal to the X-axis direction. Indicates the direction to do.

The edge stitch sewing machine 10 according to the present embodiment overlaps the body cloth C and the ball cloth T and sews them with a predetermined length with two sewing needles 13a and 13b, and between the two stitches N and N. Is a sewing machine that forms a linear cut L along the sewing direction, and further forms V-shaped cuts V and V at both ends of the cut L. Further, when the body cloth C and the ball cloth T are sewn, the flap cloth F is sewn to the body cloth C on one of the two needles 13a and 13b.
The edge stitch sewing machine 10 includes a body cloth C on the table 11 by a table 11 as a mounting table as a sewing work table and a pair of left and right large pressers 41A and 41B extending in the cloth feeding direction of the body cloth C. Is held together with the ball cloth T from the upper side and the large pressers 41A and 41B are moved in the cloth feed direction E so as to transport the body cloth C, the ball cloth T and the flap cloth F, and the large press feed mechanism 40 as a cloth feed mechanism. And a pair of left and right flap holding mechanisms 55 and 55 for holding the flap cloth F to be sewn on the body cloth C with the mounting portions 41a and 41a provided on the upper surfaces of the large pressers 41A and 41B, and sewing on the body cloth C. A binder mechanism that applies a binder 12 to the garment T to be worn and folds both side edges of the garment T, and a body cloth C and a garment that are fed along the X-axis direction by the large press feed mechanism 40. The needle up-and-down moving mechanism 70 as a sewing means for performing sewing with the sewing needles 13a and 13b, and the moving knife 14 on the downstream side in the cloth feeding direction with respect to the sewing needles 13a and 13b , A hook mechanism that captures the sewing thread from the sewing needles 13a and 13b and entangles the lower thread, and a sewing machine frame 80 that is installed on the table 11 and stores and holds the needle vertical movement mechanism 70 and the female mechanism. And a corner knife mechanism 90 for forming substantially V-shaped cuts V and V at positions corresponding to both ends of the straight cut, and placement of the large pressers 41A and 41B along the cloth feed direction E of the body cloth C A light-emitting unit that irradiates light toward the reflection surfaces 41c and 41c formed on the top surfaces of the portions 41a and 41a and a light-receiving element that receives the reflected light from the reflection surfaces 41c and 41c, and is received by the light-receiving unit. Anti First flap sensors 30 and 30 that detect the front and rear ends of the flap cloth F by increasing or decreasing the amount of light, and the upper surface of the placement portion 41a of the large press 41A along the cloth feed direction E of the body cloth C The flap cloth F has a light emitting part that irradiates light toward the reflecting surface 41d formed on the light receiving element and a light receiving element that receives the reflected light from the reflecting surface 41d, and increases or decreases the amount of reflected light received by the light receiving part. A second flap sensor 35 for detecting the front end and the rear end, and an operation control means 60 as a sewing control means for controlling the operation of each of the above-described configurations.
Each part is described in detail below.

(Table and sewing frame)
The table 11 has an upper surface parallel to the XY plane and is used in a horizontal state. A needle plate 15 is attached to a needle drop position of the table 11 by the sewing needles 13a and 13b. The needle plate 15 is formed with a needle hole into which the two sewing needles 13a and 13b are individually inserted and a slit into which the moving knife 14 of the knife mechanism is inserted.
Further, a recess for storing the bed portion 81 of the sewing machine frame 80 is formed on the table 11, and the sewing machine frame 80 is installed in the recess. Further, the table 11 is provided with a large press feed mechanism 40 and a corner knife mechanism 90 on the downstream side in the cloth feed direction of the sewing machine frame 80, and a binder mechanism (not shown except for the binder 12) on the upstream side in the cloth feed direction. Has been placed.

The sewing machine frame 80 mainly includes a bed portion 81 installed on the table 11, a vertical trunk portion 82 erected therefrom, and an arm portion 83 extending horizontally from the upper portion thereof.
A sewing machine motor 16 is disposed below the sewing machine frame 80, and a rotating drive force transmitted from the sewing machine motor 16 to the sewing machine frame 80 via a belt (not shown) is transmitted to the hook mechanism inside the bed portion 81. The shaft is supported in a state along the Y-axis direction, and an upper shaft that transmits the vertical movement driving force of the needle vertical movement mechanism 70 from the sewing machine motor 16 is provided in the arm portion 83 along the Y-axis direction. It is supported.
A pulley is fixedly mounted on each of the upper shaft and the lower shaft, and is connected by a timing belt passed through the vertical body portion 82 of the sewing machine frame 80.

(Needle vertical movement mechanism)
FIG. 4 is a perspective view of the needle vertical movement mechanism 70. The needle up-and-down moving mechanism 70 includes two needle bars 72 and 72 that individually hold the sewing needles 13a and 13b at the lower end, a support frame 79 that supports the needle bars 72 and 72 so as to be movable up and down, A needle bar holder 74 that simultaneously holds the needle bars 72, 72, a sewing machine main shaft 76 that is rotationally driven by the sewing machine motor 16, a rotary weight 77 that is fixedly connected to one end portion of the sewing machine main shaft 76, and that rotates. A crank rod 78 having one end connected to a position eccentric from the rotation center of the weight 77 and the other end connected to a needle bar holder 74 is provided.

  The sewing machine main shaft 76 is also supported so as to be rotatable along the Y-axis direction inside the arm portion 83, and a rotational driving force of full rotation is applied by the sewing machine motor 16. When the sewing machine main shaft 76 is rotated, the rotary weight 77 rotates in the same manner, and one end portion of the crank rod 78 performs a circular motion around the sewing machine main shaft 76, and the other end portion has a circular motion Z on one end side. Only the axial movement component is transmitted to the needle bar holder 74 so that the needle bars 72 and 72 reciprocate up and down.

Further, the needle bar holder 74 is provided with a latch mechanism 75 that can switch between holding and releasing the needle bars 72 and 72, and holding and releasing the needle bars 72 and 72 at the upper end portion of the support frame 79. A holding mechanism 71 capable of switching between the two is provided. Further, the latch mechanism 75 and the holding mechanism 71 can switch between holding and releasing the needle bars 72 and 72 by applying a predetermined operation from the outside, and a needle switching solenoid 73 (for switching operation to each mechanism). 7) is attached to the support frame 79.
With the needle switching solenoid 73, both the needle bars 72, 72 are held by the latch mechanism 75, one needle bar 72 is held by the latch mechanism 75, and the other needle bar 72 is held by the holding mechanism 71. The state can be switched between one needle bar 72 held by the holding mechanism 71 and the other needle bar 72 held by the latch mechanism 75.
When performing slant-shaped ball edge stitching, the above three holding states are switched at a predetermined timing to form either one of the left and right straight seams N in advance, and to form either one of the left or right straight stitches N. End first.
That is, the needle bar holder 74, the latch mechanism 75, the holding mechanism 71, and the needle switching solenoid 73 switch between the vertical movement state of the left and right needle bars 72 and 72 and the vertical movement state of both needle bars 72 and 72. A single-needle switching mechanism that can be used is configured.

(Female mechanism)
The knife mechanism includes a moving knife 14 that forms a linear cut, a knife provided with the knife 14 at the lower end and supported so as to move up and down within the arm 83, and a drive source for moving the knife up and down. A knife motor 17, a transmission mechanism that transmits the rotational driving force from the knife motor 17 in place of a reciprocating driving force in the vertical direction, and an air cylinder 14 a that switches the moving knife 14 between a standby position and a cutting position by moving up and down. .
The moving knife 14 is disposed adjacent to the two needles 13a and 13b and downstream of the two needles 13a and 13b in the cloth feeding direction (left side in FIG. 3).
The knife motor 17 is driven to rotate together with the body cloth C feeding operation, and the moving knife 14 is moved up and down by the transmission mechanism to repeatedly form a cut according to the knife width to form a linear cut.

(Hook mechanism)
The shuttle mechanism is provided in the bed portion 81 of the sewing machine frame 80. This hook mechanism is provided with two horizontal hooks individually corresponding to the two sewing needles 13a and 13b, a hook gear provided on the rotating shaft of each horizontal hook, and fixedly mounted on the lower shaft and individually provided for each hook gear. And a transmission gear for applying a rotational driving force.
When the lower shaft is rotationally driven by the sewing machine motor 16, the rotational driving force is transmitted to the hook gear via each transmission gear, and each horizontal hook is rotated via the hook shaft. Each horizontal hook catches the sewing thread from the sewing needles 13a and 13b when the tip ends of the sewing needles 13a and 13b are lowered to the lower side of the needle plate 15, and rotates in the captured state so that the horizontal hook is placed in the loop of the sewing thread. The lower thread is passed through and the sewing thread and lower thread are entangled. In this way, the sewing is performed by the cooperation of the sewing needles 13a and 13b and the horizontal hook. That is, the sewing means is constituted by the needle up-and-down moving mechanism 70 and the shuttle mechanism.

(Binder mechanism)
The binder mechanism has an inverted T-shaped cross section, a binder 12 that is set so as to wind a ball and is sent out along the longitudinal direction, and a support mechanism (not shown) that supports the binder 12 so as to be movable up and down. is doing.
The binder 12 has an inverted T-shape when viewed in cross section from a bottom plate facing the top surface of the table 11 and a standing plate erected perpendicularly to the top surface of the flat plate.
The support mechanism includes an air cylinder (not shown) serving as a drive source for the raising and lowering operation of the binder 12, an electromagnetic valve 18 (see FIG. 7) that drives the air cylinder, 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 so that the tip of the binder 12 is between the needle drop positions of the two needles 13a and 13b. Then, in cooperation with a pair of large pressing members 41A and 41B of the large pressing feed mechanism 40, which will be described later, the ball cloth T is held in the longitudinal direction while being held so as to be wound around the binder 12 so as to have a cross-sectional shape of the binder 12. The cloth T is fed out and sewn onto the body cloth C.

(Large press feed mechanism)
FIG. 5 is a perspective view of the large presser feed mechanism 40. As shown in this figure, the large presser feed mechanism 40 includes a pair of large pressers 41A and 41B for pressing the body cloth C from above at the positions on both sides of the sewing needles 13a and 13b, and under each large presser 41A and 41B. Two laying plates 47 (see FIG. 2) that are individually arranged on the side and on which the body cloth C is placed during cloth feeding, a pair of arm members 48 that individually hold the large pressers 41A and 41B, and two A support body 42 that supports the two large pressers 41A and 41B via the arm member 48 so as to be movable up and down, and a large presser 41A that allows the position of each arm member 48 held by the support body 42 to be adjusted along the Y-axis direction. A distance adjusting mechanism 49 of 41B, an air cylinder 43 for moving the large pressers 41A and 41B up and down with respect to the support 42, and an electromagnetic valve 44 for controlling driving of the air cylinder 43 (see FIG. 7). A pressing motor 45 (see FIG. 3) as a driving means for moving the body cloth C pressed by the large pressers 41A and 41B in the cloth feeding direction E, and the rotational driving force of the pressing motor 45 is linearly driven along the X-axis direction. And a ball screw mechanism 46 that converts the force into a support 42.

Each of the large pressers 41A and 41B is a flat plate having a slightly wedge-shaped cross-section and a rectangular shape in plan view, and is supported by the support 42 in a state where the edges whose thickness is reduced face each other. The two large pressers 41A and 41B are arranged side by side in the Y-axis direction with the two needles 13a and 13b interposed therebetween, and are supported by the arm member 48 so that the longitudinal direction thereof is along the X-axis direction. .
Further, each large presser 41A, 41B is composed of a top plate and a bottom plate, and each large presser 41A, 41B is provided with a gap opened toward the other large presser side. In the gaps between the large pressers 41A and 41B, presser plates 50 and 50 that can be moved back and forth are stored. The holding plates 50, 50 of the large pressers 41 </ b> A, 41 </ b> B can be reciprocated along air contact directions (Y-axis direction) by air cylinders 51, 51 provided on each arm member 48. . The air cylinders 51 and 51 are driven by electromagnetic valves 52 and 52 (see FIG. 7) controlled by the operation control means 60, and the press plates 50 and 50 are moved closer to each other to make the above-described ball cloth. Both ends can be folded so as to be wound around the binder 12, and the state can be maintained.

  The upper surfaces of the large pressers 41A and 41B function as a placement portion 41a for placing the flap cloth, and a long reflecting surface 41c is formed over the entire length in the longitudinal direction. The reflection surface 41c is used for detecting the upstream end position and the downstream end position of the cloth feed direction of the flap cloth F held by the flap holding mechanism 55 described later. FIG. 6 is a plan view showing a state in which the flap cloth F is set on the placement portion 41a on the upper surface of the large presser 41A. As shown in FIG. 6, when a part of the reflection surface 41 c in the longitudinal direction is shielded by the flap cloth F, the first flap sensor 30 detects a decrease in the reflectance of the shield part, thereby the flap cloth F. The upstream end (rear end) position and the downstream end (front end) position of F in the cloth feeding direction are recognized by the operation control means 60.

Further, only one large presser 41A (the left side large presser in FIGS. 2 and 5) is provided with a long reflecting surface 41d on the upper surface thereof over the entire length in the longitudinal direction. The reflecting surface 41d is also used to detect the upstream end position and the downstream end position of the flap cloth F held in the flap holding mechanism 55, which will be described later.
That is, as shown in FIG. 6, the reflection surface 41d is provided at a position that is parallel to the reflection surface 41c described above and slightly shifted in the Y-axis direction (direction orthogonal to the cloth feed direction). When the end of the flap cloth F is detected in such a manner as to be displaced in the Y-axis direction with respect to the reflection surface 41c in this way, if the end of the flap cloth F is inclined, the timing of edge detection by the reflection surface 41c. Since a difference occurs in the (or the transport position of the flap cloth F at the time of detection), the inclined state of the end of the flap cloth F can be obtained based on this difference.

  Each arm member 48 is swingably supported by a support shaft 42a provided along the Y-axis direction on one end side of the support 42. Then, the large pressers 41A and 41B are held on the front end side of each arm member 48, and the rear end side is raised and lowered by the air cylinder 43. As a result, each arm member swings to raise and lower the large pressers 41A and 41B. To do.

  The interval adjusting mechanism 49 is provided between each arm member 48 and the support shaft 42a. Each spacing adjustment mechanism 49 can fasten and fix the arm member 48 that moves along the support shaft 42a at an arbitrary position. Thereby, each large presser 41A, 41B can be adjusted to an arbitrary position in the Y-axis direction via each arm member 48, and the distance between each large presser 41A, 41B can also be adjusted.

Each laying plate 47 is fixedly equipped on the support 42 while being placed on the upper surface of the table 11 below the large pressers 41A and 41B, and moves along the cloth feed direction E together with the large pressers 41A and 41B. I do. Each laying plate 47 extends along the X-axis direction and is set to have approximately the same width as the large pressers 41A and 41B in the Y-axis direction. Each laying plate 47 is arranged with the two needles 13a and 13b sandwiched so as not to cover the needle plate 15 during sewing.
Each laying plate 47 is always positioned at the height of the upper surface of the table 11, and the large pressers 41 </ b> A and 41 </ b> B are lowered to hold the body cloth C in a sandwiched state. In other words, each laying plate 47 is provided on the lower side of the body cloth C and protects it from sliding on the upper surface of the table 11 when the body cloth C is conveyed.

In the air cylinder 43, the large pressers 41A and 41B can be switched between the upper position and the lower position via the arm members 48 by the electromagnetic valve 44. The large pressers 41 </ b> A and 41 </ b> B are lowered to the height of the upper surface of the laying plate 47 at the lower position. The operation of the solenoid valve 44 of the air cylinder 43 is controlled by the operation control means 60.
The ball screw mechanism 46 supports the support 42 so as to be movable along the X-axis direction on the table 11, and arbitrarily positions the two large pressers 41 </ b> A and 41 </ b> B in the X-axis direction by driving the presser motor 45. Making it possible.

(Flap holding mechanism)
As shown in FIG. 5, the flap holding mechanism 55 is individually provided on each upper surface corresponding to each large presser 41A, 41B so that the flap cloth is held on the upper surface of one of the large pressers 41A or 41B. It has been. Each flap holding mechanism 55 includes a flap pressing member 56 that is pivotally supported by the arm member 48 so as to be able to come into contact with and away from the upper surfaces of the large pressing members 41A and 41B, and an air cylinder 57 that applies rotational force to the flap pressing member 56. Thus, the flap cloth F is held and released.
The flap holding mechanism 55 is for holding one of the left and right side edges, which are the sewing end of the flap cloth F, in a state along the X-axis direction. The flap cloth F is held so that the edge portion passes the needle drop position of one sewing needle 13a or 13b when the large pressers 41A and 41B move. Then, the flap cloth F covers the reflective surface 41c of the large pressers 41A and 41B (the reflective surface 41d for the large presser 41A) from the top over the entire length in the longitudinal direction of the flap cloth F. It is supposed to be retained.
The flap holding mechanism 55 is provided individually for each of the large pressers 41A and 41B, but only one of them is selected and used during the sewing operation of the flap cloth F.

(First flap sensor)
The first flap sensor 30 is individually provided corresponding to each of the large pressers 41A and 41B, and is provided side by side along the Y-axis direction on the arm unit front side of the sewing machine frame 80. Each of these first flap sensors 30 is provided above the movement path of each of the large pressers 41A and 41B and upstream of the two 13a and 13b in the cloth feeding direction (the right side in FIG. 2).
Each first flap sensor 30 detects the reflected light of the light emitted from the light emitting element 33 that irradiates irradiation light from vertically above toward the reflection surface 41c of the large pressers 41A and 41B and the reflection light of the reflection surface 41c. A light receiving element 31 for inputting a detection signal to the operation control means 60 and a support bracket 32 for supporting the light receiving element 31 on the outer surface of the sewing machine arm portion 83 are provided. The light emitting element 33 and the light receiving element 31 are integrally stored in the same container.
The support bracket 32 supports the light receiving element 31 and the light emitting element 33 above the reflecting surface 41c of the large pressers 41A and 41B with the light receiving element 31 and the light emitting element 33 facing downward.

(Second flap sensor)
Only one second flap sensor 35 is provided corresponding to only one large presser 41A (the left large presser 41A in FIGS. 2 and 5), and two first flap sensors 35 are provided on the arm unit front side of the sewing machine frame 80. The flap sensor 30 is provided side by side along the Y-axis direction.
The second flap sensor 35 is provided above the movement path of the large presser 41A and upstream of the two needles 13a and 13b in the cloth feeding direction (left side in FIG. 2).
The second flap sensor 35 detects the reflected light of the light emitted from the light emitting element 38 that irradiates light from vertically above the reflective surface 41d of the large presser 41A and the reflected light from the reflective surface 41d, and outputs a detection signal. A light receiving element 36 that inputs to the operation control means 60 and a support bracket 37 that supports the light receiving element 31 on the outer surface of the sewing machine arm portion 83 are provided. The light emitting element 38 and the light receiving element 36 are integrally stored in the same container.
The support bracket 37 supports the light receiving element 36 and the light emitting element 38 above the reflecting surface 41d of the large presser 41A with the light receiving element 36 and the light emitting element 38 facing downward.
The light emitting elements 33 and 38 of the first and second flap sensors 30 and 35 are arranged so as to irradiate irradiation light on both sides of the lowered position of the flap pressing member 56, and the flap pressing member 56 can hold | maintain the flap cloth F, without interfering with the detection of the edge part of the flap cloth F by each flap sensor 30,35.

(Corner knife mechanism)
The corner knife mechanism 90 is disposed below the table 11 and downstream of the moving knife 14 in the passage of the large pressers 41A and 41B by the large press feed mechanism 40 (left side in FIG. 3). The body cloth C conveyed to the work position of the corner knife 91 by the large press feed mechanism 40 is penetrated through the corner knife 91 from below to form substantially V-shaped cuts V at positions that are both ends of the straight cut. .
That is, the corner knife mechanism 90 includes a corner knife unit including a corner knife 91 and an air cylinder 92 that moves the corner knife 91 up and down, one on each of the sewing start end side and the sewing end end side. And a drive motor 94 for moving and positioning the corner knife unit on the sewing start end side along the X-axis direction with respect to the fixed corner knife unit on the sewing end side, and an electromagnetic valve 93 for driving each air cylinder 92. ing.
The corner knife 91 has a V-shaped cross section viewed from above, and forms a V-shaped cut V by penetrating each fabric from below.

  This corner knife mechanism 90 has a left-right asymmetry used when a pocket-shaped opening is formed in a symmetrical shape corresponding to a rectangular opening and when the pocket opening is a parallelogram. The corner knife 91 can be adjusted to a state where a V-shaped cut is formed.

(Control system for hem stitch machine)
FIG. 7 is a block diagram showing a control system of the edge stitch sewing machine 10. As shown in this figure, the operation control means 60 has a display panel 64 for displaying various control status information, a setting switch 65 for inputting various settings relating to sewing, and an activation switch 66 for inputting the start of sewing. And the operation pedal 68 are connected via an input / output circuit (not shown).
The setting switch 65 is provided with an input key (not shown) for setting various parameters.
The start switch 66 is a means for inputting the start of sewing. When the start switch 66 is input, an input by the operation pedal 68 is possible.
The operation pedal 68 is an instruction input unit that shifts to execution of sewing start when the pedal 68 is depressed after the start switch 66 is input. That is, sewing can be executed through the two-step operation of the start switch 66 and the operation pedal 68 described above.

The operation control means 60 includes a sewing machine motor 16, a presser motor 45, a knife motor 17, a corner knife drive motor 94, and a needle switching solenoid 73 to be controlled by drivers 16 a, 45 a, 17 a, 94 a, and 73 a, respectively. Connected through.
The operation control means 60 includes an air cylinder that moves the binder 12 up and down, an air cylinder 43 that raises and lowers the large pressers 41A and 41B, an air cylinder 51 that operates the presser plate 50, and an air cylinder that holds the flap cloth F. 57, solenoid valves 18, 44, 52, 58, 93, and 20 for controlling the operation of the air cylinder 92 for moving the corner knife 91 up and down and the air cylinder 92 for switching between the standby state and the usable state of the moving knife 14 are drivers 18a and 44a. , 52a, 93a, and 20a.
Further, each light emitting element 33 (only one is shown in FIG. 7) of the pair of first flap sensors 30 is connected to the operation control means 60 via a power supply circuit 33a, and each light receiving element 31 (FIG. 7). , Only one is shown) is connected via the interface 31a.
Similarly, the light emitting element 38 of the second flap sensor 35 is connected to the operation control means 60 via a power supply circuit 38a, and the light receiving element 36 is connected via an interface 36a.
Further, the operation control means 60 includes origin sensors of large pressers 41A and 41B that detect a detected portion 42b (see FIG. 8) provided at the downstream end of the support base 42 of the large presser feed mechanism 40 in the cloth feed direction. 19 is connected via an interface 19a. The origin sensor 19 is arranged on the table 11 so as to detect the detected portion 42b provided on the support 42 when the large pressers 41A and 41B are conveyed to the end point near the end of the cloth feeding direction or close to the end point ( The operation control means 60 obtains the current positions of the large pressers 41A and 41B in the cloth feed direction by counting the rotation angle of the presser motor 45 from the detected position as the origin.

  The operation control means 60 includes a CPU 61 that performs various controls, a ROM 62 that stores a sensor detection position specifying control program 62a, a sewing reference position calculation program 62b, and a bead stitch control program 62c, and various data relating to the processing of the CPU 61. A RAM 63 for storing in the work area, and an EEPROM 69 as storage means for storing various setting data for performing sewing of the flap cloth F in a rewritable manner are provided.

(Sensor detection position identification process)
The CPU 61 performs operation control and processing of each unit for obtaining the detection positions of the first and second flap sensors 30 and 35 by the above-described sensor detection position specifying control program 62a.
In the sensor detection position specifying process, when not sewing, the large pressers 41A and 41B are made to stand by at the cloth setting position for setting the sewing product, and the index plate 100 (see FIGS. 8 and 9) is moved to the flap sensors 30 and 35. The large pressers 41A and 41B are installed at the specified positions on the front side and the large pressers 41A and 41B so that the index plates 100 are held by the large pressers 41A and 41B. This is executed while moving toward (arrow E direction).
In the following description, the case of obtaining the detection position of the first flap sensor 30 on the large presser 41A side will be described as an example, and the detection positions of the other flap sensors 30 and 35 are the same as the following description. Since it can be obtained by the above process, it is omitted.

FIG. 8 shows the distance of each part in a state where the detected part 42b of the support body 42 of the large pressers 41A and 41B is at a position detected by the origin sensor 19 (referred to as the origin position O of the large pressers 41A and 41B). FIG. 9 is a detailed explanatory view in which the index plate 100 is further enlarged and its dimensions are shown in detail.
As shown in FIG. 9, the indicator plate 100 is formed in a right triangle shape, and is greatly pressed at a predetermined position that is known with respect to the detected portion 42 b with one base 101 parallel to the Y-axis direction. The inclination angle at the apex 102 between the base 101 and the hypotenuse 103 is set to be a preset θ. The indicator plate 100 is made of a material that does not transmit light and has a low light reflectance, and shields a part of the reflection surface 41c of the large presser 41A while being installed at a specified position. Note that the indicator plate 100 may be formed by cutting out paper, for example, as long as it is not a special material and has a known size.
That is, the indicator plate 100 is made of a surface material that does not transmit light and has a low light reflectance, so that the first and second flap sensors 30 are moved in accordance with the movement of the large pressers 41A and 41B along the X-axis direction. , 35, a state change section that causes a state change of the reflected light (a section in which the passing position of irradiation light from the sensor 30 or 35 passes on the indicator plate 100 due to the movement of the large pressers 41A, 41B) is provided. Yes. Since the indicator plate 100 is arranged with the base 101 along the Y-axis direction and the shape thereof is a right triangle, the length of the state change section in the X-axis direction (cloth feed direction) is in the Y-axis direction. It is formed so as to cause an inherent change depending on the position. Here, the inherent change is the distance from the passing position of the irradiated light on the bottom 101 of the indicator plate 100 to the vertex 102 ("b / tan θ" in FIG. 9) and the length of the passing path of the irradiated light (FIG. 9). "B") indicates a proportional change.
When detecting the position of the first flap sensor 30 on the large presser 41B side, a symmetrical indicator plate is used with respect to the X axis, and is similarly installed at a known specified position on the large presser 41B. The
As shown in FIGS. 8 and 9, the indicator plate 100 is configured such that when the large pressers 41 </ b> A and 41 </ b> B are waiting at the cloth setting position described above, the base 101 has a distance DL in the X-axis direction from the detected portion 42 b. The apex 102 which is not a right angle is disposed on the upper surface of the large presser 41A in a specified position and in a specified direction so that the vertex 102 is located at a distance DW in the Y-axis direction. In addition, the specified position when installing the indicator plate 100 can be marked by marking or the like on the upper surfaces of the large pressers 41A and 41B, for example. Further, the needle drop position of the sewing needle 13a closer to the first flap sensor 30 on the large presser 41A side is the distance DN from the origin position O in the X-axis direction (the needle drop position of the sewing needle 13b is the same), and the Y axis It is at a distance DY with respect to the direction. In the following description, when the needle drop position of the sewing needle 13a or the sewing needle 13b is indicated, it is simply referred to as the sewing needle 13a or the sewing needle 13b for the sake of simplifying the description.
Note that setting the index plate 100 at the specified position as described above does not simply indicate that the index plate is set at the specified position, but each side of the index plate 100 is at a predetermined position. It shows installation with position and angle.
Further, DT and D2 are distances calculated by a sensor detection position specifying control program 62a, which will be described later, in order to specify the detection position of the first flap sensor 30 on the large presser 41A side. A direction distance DT and a Y-axis direction distance D2 with respect to the sewing needle 13a.
Then, the sensor detection position specifying control program 62a executes a calculation for obtaining these distances DT and D2. Further, the values of the inclination angle θ and the distances DL, DW, DN, and DY are all known. The inclination angle θ is the shape data for specifying the shape of the indicator plate 100, and the distances DL and DW are the installation positions of the indicator plate 100. As position data indicating the position, DN and DY are preliminarily set and stored in the EEPROM 69 as needle drop position data indicating the needle drop position of the sewing needle 13a.
The parameters corresponding to the inclination angle θ and the distances DL, DW, DN, and DY for obtaining the detection positions of the other flap sensors 30 and 35 are also stored in the EEPROM 69 in the same manner.

When the index plate 100 is installed at the specified position when the large pressers 41A and 41B are standing by at the cloth setting position (the positions shown in FIGS. 8 and 9), the CPU 61 detects the above-described sensor detection position specifying control program. 62a is used to drive and control the presser motor 45 to move the large pressers 41A and 41B from the cloth setting position in the cloth feeding direction E, and the amount of movement of the large presser 41A at that time is calculated from the operation amount of the presser motor 45. Accumulate. When the hypotenuse 103 of the indicator plate 100 reaches the detection position of the first flap sensor 30 on the large presser 41A side and the light intensity reduction of the reflected light is detected, the CPU 61 sets the cloth set of the large presser 41A at that time. A movement amount a from the position is stored in the RAM 63. Further, when the base 101 of the indicator plate 100 reaches the detection position of the first flap sensor 30 on the large presser 41A side and the increase in the light intensity of the reflected light is detected, the CPU 61 sets the cloth set of the large presser 41A at that time. By subtracting the above-mentioned movement amount a from the movement amount e from the position, the first flap sensor 30 scans the indicator plate 100 along the X-axis direction. ) And is stored in the RAM 63 together with the movement amount e. By executing the processing so far, the CPU 61 functions as a section length calculation means for obtaining the cloth feed direction length b of the state change section in which the state change of the reflected light by the flap sensor 30 occurs.
Furthermore, when the CPU 61 obtains the movement amount e, as shown in FIG. 8, since DL−e = DN + DT is established, DT = DL−DN−e, so that X against the sewing needle 13a of the first flap sensor 30 is obtained. An axial distance DT is calculated.
Further, when the CPU 61 acquires the state change section distance b, as shown in FIG. 9, the distance along the Y-axis direction from the apex 102 of the indicator plate 100 to the first flap sensor 30 is b / tan θ, Since b / tan θ) + DW = D2 + DY is established, the Y-axis direction distance D2 of the first flap sensor 30 with respect to the sewing needle 13a is calculated by D2 = (b / tan θ) + DW−DY.
Thereby, even when the detection position of the first flap sensor 30 of the large presser 41A is unknown immediately after the attachment or just after the position adjustment, the arrangements DT and D2 based on the sewing needle 13a can be calculated. Further, since the position of the sewing needle 13a is known, the detection position of the first flap sensor 30 based on the origin can also be calculated.
By executing such processing, the CPU 61 functions as sensor detection position specifying means.

In addition, when calculating | requiring a detection position about the 2nd flap sensor 35, the distance a until the 2nd flap sensor 35 detects the indicator plate 100, and the distance until the base 101 of the indicator plate 100 is detected. e and the state change section distance b by the second flap sensor 35 are obtained, and the distances DT and D2 from the sewing needle 13a to the second flap sensor 35 are obtained using the parameters DL, DW, DN, and DY described above. The requested process is performed.
Further, when obtaining the detection position for the first flap sensor 30 of the large presser 41B, the X-axis passing through the center of the sewing needles 13a and 13b after each of the large pressers 41A and 41B is positioned at the cloth setting position. The index plate 100 is placed upside down so as to be symmetrical with the case of obtaining the position of the flap sensor 30 on the large presser 41A side across a straight line along the straight line, and the respective distances a, e, b are obtained. To the top of the index plate 100 installed on the large presser 41B and distances DN and DY from the origin O to the right sewing needle 13b, and the first flap sensor 31 from the right sewing needle 13b. To obtain the distance DT (distance in the X-axis direction with respect to the sewing needle 13b) and D2 (distance in the Y-axis direction with respect to the sewing needle 13b).
The parameters DN, DY, DT, and D2 for obtaining the detection positions of the sensors 30, 30, and 35 are all based on the sewing needle 13a that is closer to the sensor. The value may be based on the needle 13b.
Of course, another indicator plate symmetrical to the indicator plate 100 may be prepared without turning the indicator plate 100 upside down.

(Sewing reference position calculation process)
The sewing reference position calculation process is a process for obtaining the sewing start position and the sewing end position when performing the edge stitching with the sewing of the flap cloth. Here, a case where the sewing start position is obtained in the sewing of the oblique flap cloth will be described as an example.
In accordance with the sewing reference position calculation program 62b, the CPU 61 first determines the position of the large presser 41A moving along the cloth feed direction E and the flap in the state where the flap cloth F is held on the large presser 41A by the flap holding mechanism 55. The inclination of the end portion of the flap cloth F held by the flap holding mechanism 55 from the relationship with the change in the detection state of the reflected light of the first and second flap sensors 30 and 35 with respect to the one large presser 41A holding the cloth F. Deviation calculation processing for calculating the end position deviation DS of the stitches N and N formed by the left and right sewing needles 13a and 13b corresponding to the above is executed.

As described with reference to FIG. 1, in the case of the edge stitch for sewing the flap cloth F, the edge which becomes the free end of the flap cloth F after the sewing is the seam N of the end edge on the sewing side. It will be folded back to the axis. Then, the four points located at both ends of the two seams N, N become the four vertices of the parallelogram-shaped pocket opening, and the folded flap cloth F overlaps with the pocket opening. The end position deviation DS of the stitches N, N is set.
FIG. 10 shows a case where the flap cloth F is placed on the large presser 41A provided with the second flap sensor 35 and the rim sewing is performed, and the flap cloth F and each flap at the sewing start end side are shown. It is explanatory drawing which shows the relationship between the parameters which should be calculated by arrangement | positioning of the sensors 30 and 35, the sewing needles 13a and 13b, and the stitches N and N, and this deviation calculation process.
Further, FIG. 11 shows a case where the flap cloth F is placed on the large presser 41A provided with the second flap sensor 35 and the rim stitching is performed, and the flap cloth F on the sewing end end side and It is explanatory drawing which shows the relationship between the parameters which should be calculated by arrangement | positioning of each flap sensor 30, 35, the sewing needles 13a, 13b, and the stitches N and N, and this deviation calculation process.
At the sewing start end and the sewing end end, when the reflected light is reduced due to the start end of the flap cloth, the process starts or when the reflected light increases at the end edge of the flap cloth. Since it is a difference whether it is a process start, since the processing content after starting is the same, these description shall be performed simultaneously.

In FIG. 10 or FIG. 11, the reference signs P <b> 1 and P <b> 2 are the end detection positions of the flap cloth F by the first flap sensor 30 and the second flap sensor 35, respectively.
In the figure, D1 is a distance between the first flap sensor 30 and the second flap sensor 35 in the Y-axis direction, DO is a shift amount between the first flap sensor 30 and the second flap sensor 35 in the X-axis direction, D2 is the distance in the Y-axis direction between the first flap sensor 30 and the left sewing needle 13a obtained in the sensor detection position specifying process, and D3 is after the second flap sensor 35 detects the end of the flap cloth F. The cloth feed amount of the flap cloth F until the first flap sensor 30 detects it, DG is the gauge size that is the distance in the Y-axis direction of the two sewing needles 13a and 13b, and DF is the flap by the first flap sensor 30 The distance in the X-axis direction (cloth feed direction) from the sewing start position of the seam N closer to the cloth edge detection position of the cloth F, DS is the end position deviation of the two seams N and N, D Is the distance in the X-axis direction and the second flap sensor 35 and the left of the needle 13a obtained by the sensor detecting position specifying process. The value of D1 is obtained by the sensor detection position specifying process for the first flap sensor 30 and the value of the Y-axis direction distance D2 with respect to the sewing needle 13a obtained by the sensor detection position specifying process for the second flap sensor 35. The value of DO is calculated from the difference from the value of the Y-axis direction distance D2 with respect to the sewing needle 13a, and the value of DO is the distance DT with respect to the X-axis direction with respect to the sewing needle 13a obtained by the sensor detection position specifying process for the second flap sensor 35. And the difference between the first flap sensor 30 and the value of the distance DT in the X-axis direction with respect to the sewing needle 13a obtained in the sensor detection position specifying process.
Among these, since DG is a known value, it is input from the setting switch 66 and stored in the EEPROM 69 before sewing. Since D1, DO, D2, and DT are values acquired by the sensor detection position specifying process, they are stored in the EEPROM 69 after the process.
D3, DF, and DS are values obtained by detecting the flap end at the time of sewing and calculating from the positions in the X-axis direction of the large pressers 41A and 41B at that time.

The CPU 61 calculates D3, DF, and DS in the deviation calculation process.
First, when the second flap sensor 35 detects the flap end portion on the start end side or the end end portion side, the CPU 61 starts the flap on the start end portion side or the end end portion side from that point. The operation amount of the pressing motor 45 until the end portion is detected is measured, D3 is calculated from the motor operation amount, and stored in the EEPROM 69.
That is, since D1: (D3 + DO) = DG: DS, when D3 is obtained from the operation amount of the pressing motor 45, the CPU 61 calculates DS by DS = (DG × (D3 + DO)) / D1 and stores it in the EEPROM 69.
Similarly, since D1: (D3 + DO) = D2: DF, when D3 is acquired, the CPU 61 calculates DF by DF = ((D3 + DO) × D2) / D1, and stores it in the EEPROM 69.

Further, the CPU 61 determines the sewing reference position calculation program 62b from the change in the detection state of the reflected light by the flap cloth F detected by the first and second flap sensors 30 and 35 with respect to the large presser 14A holding the flap cloth F. Thus, for the one-needle switching mechanism of the needle up-and-down moving mechanism 70, the left and right stitches N are determined based on the calculated end position deviation DS and other parameters D1, D2, DG, DT, D3, DF, DO. , N deviation sewing control for determining the sewing start or sewing end of N is executed.
That is, the CPU 61 is close to the first flap sensor 30 when the first flap sensor 30 detects the start end portion or the end end portion of the flap cloth F during conveyance of each fabric by the large pressers 41A and 41B. For the other sewing needle 13a, the needle switching solenoid 73 is driven and controlled so that the needle drop is started or ended after being conveyed by the distance (DT + DO + DF) from the detection time point, and the other sewing needle 13b is detected. The drive control of the needle switching solenoid 73 is performed so that the needle drop is started or ended after being conveyed by a distance (DT + DO + DF-DS) from the time point.

(Ball edge sewing control)
The CPU 61 executes the operation control of each part from the start of sewing to the completion of the edge sewing by the above-described edge sewing control program 62c.
Specifically, the operation control of the start and end of cutting of the straight cut L and the formation control of the cuts V and V by the corner knife are performed.

  The cut start position and end position of the straight line break L are determined in correspondence with the start position and end position of the straight stitches N, N. That is, the positional relationship between the sewing needles 13a and 13b and the moving knife 14 in the X-axis direction is constant and stored in the EEPROM 69 in advance. The straight line break L is started from the downstream side by the length in the X-axis direction of the cutting length of the corner knife 91 from the sewing start position of the seams N and N. Since the cutting length of the corner knife 91 is also input to the EEPROM 69 in advance, the movement distances of the large pressers 41A and 41B from the start of sewing of the stitches N and N to the start of cutting of the cut L can be obtained from these set values. The drive control of the knife motor 17 and the moving knife raising / lowering air cylinder 20 is performed so that the formation of a straight cut is started after waiting for the movement of the movement distance from the start of sewing. Further, the end position of the straight line break can be obtained in the same manner from the end positions of the stitches N and N, and the same operation control is performed.

In the formation control of the cut lines V and V by the corner knife, the CPU 61 detects the end of the sewing start end side and the end of the sewing end by detecting the end of sewing start and end of the flap cloth F of the flap sensors 30 and 35. A separation distance from the side cut V is obtained, and a moving distance of the corner knife unit on the sewing start end side with respect to the corner knife unit on the sewing end end side is calculated.
The distance from the sewing needles 13a and 13b to the corner knife unit on the fixed side of the corner knife mechanism 90 is set in the EEPROM 69 in advance.
Accordingly, the CPU 61 moves and positions the moving corner knife unit according to the length of the seam N, and conveys the large pressers 41A and 41B by a predetermined distance after the formation of the straight line break L and the seams N and N is completed. Thus, control is performed to position both ends of the seam N to the corner knife 91 of each corner knife unit, and further, the air cylinders are driven to form the cut lines V and V.

(Sensor detection position specifying operation of the edge stitch sewing machine)
FIG. 12 is a flowchart showing details of the sensor detection position specifying process based on the above-described sensor detection position specifying control program 62a. Here, the flow of the sensor detection position specifying process will be specifically described by taking as an example the case where the indicator plate 100 is installed on the large presser 41A.
First, the CPU 61 drives the presser motor 45 to search the origin of each of the large pressers 41A and 41B by the origin sensor 19, moves the large pressers 41A and 41B to the cloth setting position shown in FIG. The large pressers 41A and 41B are lowered by the operation of the arm members 48 by the electromagnetic valve 44 of 43. (Step S1).
Subsequently, the CPU 61 waits for the sensor detection position specifying operation to wait for the indicator plate 100 to be installed at a specified position on the upper surface of the large presser 41A (installation process) and for the start switch 66 to be input (step S2). .

  When the CPU 61 receives an input from the start switch 66, the air cylinder 57 is actuated by driving the solenoid valve 58 to lower the flap pressing member 56 onto the upper surface of the large presser 41A, and between the upper surface of the large presser 41A. 100 is clamped (step S3), and the large presser 41A is moved in the cloth feeding direction E (step S4).

Next, it is determined whether or not the indicator plate 100 is detected by the first flap sensor 30 (step S5). Hereinafter, the detection state is described as “ON”. The same applies to a flap cloth.
When the oblique side 103 of the index plate 100 is detected by the first flap sensor 30, the amount of movement a related to the first flap sensor 30 of the large pressers 41A and 41B from the cloth setting position to the detection position is stored in the RAM 63. (Step S6), and the process proceeds to step S7. When the first flap sensor 30 is OFF, the process proceeds to step S7 as it is.
In step S7, it is determined whether or not the indicator plate 100 is detected by the second flap sensor 35. When the oblique side 103 of the indicator plate 100 is detected by the second flap sensor 35, the amount of movement a related to the second flap sensor 35 of the large pressers 41A and 41B from the cloth setting position to the detection position is stored in the RAM 63. (Step S8), and the process proceeds to step S9. When the second flap sensor 35 is OFF, the process proceeds to step S9 as it is.

In step S9, it is determined whether or not the first flap sensor 30 has been switched from ON to OFF. When the first flap sensor 30 is switched from ON to OFF, the first flap sensor 30 is turned on by subtracting the aforementioned movement amount a from the movement amount e from the cloth setting position of the large presser 41A at that time. The scanning distance b, which is the length in the cloth feed direction of the state change section with respect to the first flap sensor 30, which is the amount of movement of the large pressers 41A, 41B from when the pressure is reached, is calculated and stored in the RAM 63 together with the amount of movement e. (Step S10: section length calculation step), the process proceeds to step S11. If the first flap sensor 30 remains on or remains off from the beginning, the process proceeds directly to step S11.
In step S11, it is determined whether or not the second flap sensor 35 has been switched from ON to OFF. When the second flap sensor 35 is switched from ON to OFF, the above-mentioned movement amount a is subtracted from the movement amount e from the cloth setting position of the large presser 41A at that time, and the second flap sensor 35 is turned ON. The scanning distance b, which is the length in the cloth feed direction of the state change section with respect to the second flap sensor 35, which is the amount of movement of the large pressers 41A, 41B from when the pressure is reached, is calculated and stored together with the amount of movement e in the RAM 63. (Step S12: section length calculation step), the process proceeds to step S13. If the second flap sensor 35 remains on or remains off from the beginning, the process proceeds to step S13.

In step S13, it is determined whether or not the movement to the end of the large pressers 41A and 41B is completed by determining the detection of the detected part 42b by the origin sensor 19, and if the movement is not completed, the process is stepped. Returning to S5, if completed, the process proceeds to step S14. If there is no abnormality by repeating steps S5 to S13, the movement amounts a and e and the scanning distance b are acquired for each of the first and second flap sensors 30 and 35.
In step S14, it is determined whether each of the flap sensors 30 and 35 has detected the indicator plate 100. If both the sensors 30 and 35 have detected the indicator plate 100, the process proceeds to step S17. If any one of them has been detected and has not been detected, an error is displayed on the display panel 64 as an abnormality has occurred (step S15), the operation of the sewing machine 10 is stopped (step S16), and sensor detection is performed. The position specifying process ends.

In step S17, the distance DT is calculated for each sensor from the amount of movement e of each of the first and second flap sensors 30,35.
Next, a distance D2 is calculated for each sensor from the scanning distance b of each of the first and second flap sensors 30, 35 (step S18: sensor detection position specifying step).
Then, each large presser 41A, 41B is lifted, and is in a standby state for rim stitching, and the sensor detection position specifying process ends (step S19).

(Sewing operation of the edge stitch sewing machine)
13 and 14 are flowcharts showing details of the sewing reference position calculation process based on the above-described sewing reference position calculation program 62b and the operation control of each part from the start of sewing to the completion of the edge sewing based on the edge sewing control program 62c. is there. Here, it is assumed that the sewing is already performed after the sensor detection position specifying process has been performed, and the flow of the process is specifically described by taking the case where the flap cloth F is installed on the large presser 41A as an example. explain.
First, the CPU 61 waits for an input to start sewing by the start switch 66 (step S31).
When the input is received, the presser motor 45 is driven by the control of the CPU 61, and the retracted large pressers 41A and 41B move in the direction opposite to the feed direction at the time of sewing, and the body cloth C and the tart T are set. Move to the position (step S32).
Next, the operator sets the body cloth C under the large pressers 41A and 41B, and the large pressers 41A and 41B are lowered, whereby the body cloth C is held by the large pressers 41A and 41B. Furthermore, when the ball cloth T is set between the large pressers 41 </ b> A and 41 </ b> B, the large presser 41 </ b> A and 41 </ b> B is held by the binder 12 and the presser plate 50 so that the ball cloth T wraps around the binder 12. The flap cloth F is placed on the upper surface of the one large presser 41 </ b> A and is held by the flap holding mechanism 55. As a result, the body cloth C, the ball cloth T and the flap cloth F are all held by the large pressers 41A and 41B (step S33).

Next, the CPU 61 receives the input of the operation pedal 68 and drives the presser motor 45 to advance the large pressers 41A and 41B in the feed direction E during sewing (step S34).
Then, it waits for detection of the flap end on the sewing start side by one of the flap sensors 30 or 35 (step S35), and when the flap end is detected, it is determined which flap sensor 30 or 35 it is. The determination result and the positions of the large pressers 41A and 41B at the time of detection are stored in the RAM 63 (step S36).
Next, the next flap sensor 30 or 35 waits for detection of the flap end (step S37). When the flap end is detected, the sewing reference position calculation process determines the position of the large pressers 41A and 41B at the time of detection. The transport distance D3 is calculated from the position at the time of detection (step S38).
Further, the CPU 61 obtains the distance DF and the end position deviation DS from the detection of the flap sensor 30 or 35 detected later to the sewing start position by one sewing needle 13a by acquiring D3, and each sewing needle 13a, The sewing start positions of the stitches N and N by 13b are calculated (step S39: sewing reference position specifying step).

When the sewing start positions by the respective needles 13 and 13 are calculated, the CPU 61 determines whether or not the sewing start positions of the respective sewing needles 13a and 13b coincide with each other to determine whether or not the sewing is performed by both the needles ( Step S40).
As a result, in the case of sewing with both needles, the needle switching solenoid 73 is controlled to move both needles up and down and waits for the sewing start position to be reached (step S41). Operation control for starting sewing is performed (step S42).
If the sewing start positions of the sewing needles 13a and 13b do not coincide with each other, the needle switching solenoid 73 is controlled so that only the preceding sewing needle 13a or 13b is moved up and down and the sewing needle 13a or 13b starts to be sewn. Waiting for the position to reach (step S43), when the position is reached, the sewing machine motor 16 is driven to perform operation control to start sewing (step S44). Further, waiting for the other sewing needle 13b or 13a to reach the sewing start position (step S45), when it reaches, the needle switching solenoid 73 is controlled to switch to the two-needle vertical movement state and the other sewing needle 13b or 13a is switched. Also, the operation control to start sewing is performed (step S46).

  Next, the cutting start position by the center knife 14 is calculated from the sewing start position of the stitches of the sewing needles 13a and 13b by the ball edge sewing control program 62c, and driving of the center knife starts after the cutting start position is reached. The air cylinder for raising and lowering the knife motor 17 and the center knife 14 is controlled (step S47).

Next, the sewing reference value calculation program 62b waits for detection of the flap end on the sewing end side by any of the flap sensors 30 or 35 (step S48), and when the flap end is detected, any of the flap sensors 30 is detected. Or the determination result and the positions of the large pressers 41A and 41B at the time of detection are stored in the RAM 63 (step S49).
Next, the next flap sensor 30 or 35 waits for detection of the flap end (step S50). When the flap end is detected, the sewing reference position calculation process determines the position of the large pressers 41A and 41B at the time of detection. Based on D3, the distance DF from the detection of the flap sensor 30 or 35 detected later to the sewing start position by one of the sewing needles 13a or 13b is calculated from the position at the time of detection described above. The end position deviation DS is obtained, and the sewing end positions of the stitches N and N by the sewing needles 13a and 13b are calculated (step S51: sewing reference position specifying step).

When the sewing end positions by the respective needles 13a and 13b are calculated, the CPU 61 determines whether or not the sewing end positions of the respective sewing needles 13a and 13b coincide with each other to determine whether or not the sewing is performed by both the needles ( Step S52).
As a result, in the case of sewing with both needles, waiting for the sewing end position to be reached (step S53), and when reaching, operation control for stopping the sewing machine motor 16 and ending the sewing is performed (step S).
If the sewing start positions of the sewing needles 13a and 13b do not coincide with each other, the arrival of the sewing end position of the preceding sewing needle 13a or 13b is awaited (step S55). Only the preceding sewing needle 13a or 13b is controlled so as to stop the vertical movement (step S56). Further, after waiting for the sewing end position of the other sewing needle 13b or 13a to reach (step S57), the sewing machine motor is stopped and operation control for ending the sewing is performed (step S58).

  Next, the cutting end position by the center knife 14 is calculated from the stitching end positions of the stitches of the respective sewing needles 13a and 13b by the ball edge sewing control program 62c, and the driving of the center knife is stopped after reaching the cutting end position. The air cylinder for raising and lowering the knife motor 17 and the center knife 14 is controlled (step S59).

Next, it waits to reach the cutting position of the corner knife mechanism 90 of the large pressers 41A and 41B (step S60), and when it reaches, the corner knife process is executed (step S61). That is, the corner knife unit on the moving side of the corner knife mechanism 90 is moved to a position corresponding to the length of the seam. When the corner knife 91 of each corner knife unit is positioned at both ends of the stitches N and N, the air cylinder 92 is driven to form the cut lines V and V.
Then, the large pressers 41A and 41B are transported to the sewing end position, and the operation of the entire stroke is completed (step S62).

(Effect of the embodiment of the invention)
The index member 100 includes a state change section that blocks or reduces the reflected light of the flap sensors 30 and 35, and the state change section is in a state along the X-axis direction according to the position in the Y-axis direction through which the irradiation light passes. The length of the change section is formed to change proportionally.
Therefore, the edge stitch sewing machine 10 obtains the actual detection position in the X-axis direction of each of the flap sensors 30 and 35 from the detection start position of the index member 100 by performing the sensor detection position specifying process, and the length of the state change section. The actual detection position in the Y-axis direction of the sensor can be obtained from the length (length in the X-axis direction of the ON section of the sensor).
Accordingly, the ball stitch sewing machine 10 obtains the detection position in the X-axis direction and the detection position in the Y-axis direction of each of the flap sensors 30 and 35, and performs the sewing reference position calculation process on the assumption that it is at the detection position. Thus, it is possible to perform sewing at an accurate sewing start position and sewing end position, and it is possible to improve the sewing quality.

  Further, since the edge stitch sewing machine 10 can accurately determine the actual detection position of each of the flap sensors 30 and 35 and can perform the sewing corresponding to the actual detection position, the highly accurate mounting operation and position of the sensor in advance. It becomes possible to make adjustment work unnecessary, and it becomes possible to reduce the work load. Further, in the sewing control after the sensor is attached or the position is adjusted, the operation for correcting various parameters becomes unnecessary, the work load can be reduced, and the maintainability can be improved.

  Further, since the first and second flap sensors 30 and 35 are provided for the one large presser 41 </ b> A in the ball stitch sewing machine 10, it is possible to sew the oblique flap cloth F. And since it is possible to obtain | require correctly the detection position in a X-axis direction and a Y-axis direction about each flap sensor 30, 35, by performing sewing control on the assumption that it exists in each said detection position, two It is possible to perform sewing at the accurate sewing start position and sewing end position for both the seams N and N, and to improve the sewing quality.

(Other)
In the edge stitch sewing machine 10, two reflective surfaces 41a and 41c are provided only for one large presser 41A, and the first and second flap sensors 30 and 35 are provided only for one large presser 41A. However, it goes without saying that a similar configuration may be provided for the other large presser 41B.

  The sensor position specifying process described above is executed when the large pressers 41A and 41B are moved in the direction of arrow E, which is a direction from the upstream side to the downstream side in the cloth feed direction, but the large presser 41A in the direction along the cloth feed direction. , 41B may be executed when the large pressers 41A, 41B are moved in the direction from the downstream to the upstream in the cloth feeding direction (the direction opposite to the arrow E). Moreover, although the case where the index plate 100 is made detachable from the large pressers 41A and 41B and is installed only at the time of the sensor detection position specifying process is illustrated, each of the reflection surfaces 41c, 41c and 41d is normally mounted with a flap cloth. It may be extended to a length where it cannot be placed, and the indicator plate may be permanently installed within a range where the flap cloth cannot be placed.

  In addition, the shape of the indicator plate 100 is not limited to a triangle, and as shown in FIGS. 15A to 15F, the shape of the indicator plate 100 is set at the passing position in the Y-axis direction of the irradiation light from each flap sensor. Accordingly, it is sufficient that the length of the state change section is uniquely determined, and it is only necessary that the correspondence between the passing position in the Y-axis direction and the state change section length is known.

  Further, as shown in FIG. 15A, an indicator plate 100A that does not have an edge portion parallel to the Y-axis direction may be used. In such a case, the two hypotenuses 101A and 103A intersect the passing line R of the irradiation light. It is assumed that the angle formed by each of the oblique sides 101A and 103A and the X-axis direction (cloth feed direction E) and the position of the vertex 102A (positions in the X-axis direction and the Y-axis direction with respect to the origin O) are known. Become. Based on these assumptions, when the intersection of the passing line R of the irradiation light and each of the oblique sides 101A, 103A is detected from the change in the state of the reflected light, the distance between the intersections is obtained from the feed amount of the large pressers 41A, 41B between them. From the inclination angles of the oblique sides 101A and 103A and the position of the vertex 102A, the distance from the vertex 102A to the passing line R of the irradiation light can be obtained. Thereby, the position in the Y-axis direction of the flap sensor can be obtained. Furthermore, if the position in the Y-axis direction is obtained, the position of the apex 102 of the indicator plate and the inclination angle of any one of the oblique sides 101A, 102A are known, so that the large pressers 41A, 41B at the time of detection of any intersection are detected. The position of the flap sensor in the X-axis direction can also be calculated from the relationship between the position in the X-axis direction, the position of the vertex 102, and the inclination angle of any one of the oblique sides 101A and 102A.

  An indicator plate 100B shown in FIG. 15B has a base 101B, a hypotenuse 103B, and a vertex 102B corresponding to the base 101, the hypotenuse 103, and the apex 102 of the indicator plate 100, respectively. The same as the case of 100.

An indicator plate 100C shown in FIG. 15C has a base 101C and a vertex 102C corresponding to the base 101 and the vertex 102 of the indicator plate 100, respectively. Accordingly, the position of the flap sensor in the X-axis direction can be obtained in the same manner as the indicator plate 100.
Further, instead of the oblique side 103, a curved outer edge portion 103C is provided. The equation (X = F (Y)) indicating the curve of the outer edge portion 103C is known, and thereby, the distance between the intersections of the passing line R of the irradiation light obtained from the change in the state of the reflected light, the base 101C, and the outer edge portion 103C. Thus, the position of the flap sensor in the Y-axis direction can be obtained.

In FIG. 15D, in addition to the indicator plate 100, a rectangular indicator plate 100D is provided. The rectangular indicator plate 100D is arranged with two sides along the X-axis direction and the remaining two sides along the Y-axis direction. Depending on the sensor characteristics of the flap sensor, hysteresis occurs between when the reflected light is switched from the detection state to the non-detection state and when the reflected light is switched from the non-detection state to the detection state, resulting in a difference in the detection position in the X-axis direction. May occur.
The distance between the two sides 101D and 102D of the index plate 100D is known in the X-axis direction. The detection of the intersection between the side 101D and the passing line R of the irradiation light is switched from the reflected light detection state to the non-detection state, and the detection of the intersection between the side 102D and the irradiation light passage line R is performed by the reflected light. Since the non-detection state is switched to the detection state, the feed amounts of the large pressers 41A and 41B from the detection of one intersection to the detection of the other include the influence of hysteresis. That is, the error can be obtained by hysteresis by obtaining the difference between the feed amount between the intersections and the actual distance between the two sides. Even in the case of a flap sensor that generates hysteresis as described above, the error amount is taken into consideration when calculating the distance between the intersections of the oblique side 103 and the bottom side 101 of the indicator plate 100 and the passing line R of the irradiation light. It becomes possible to obtain the sensor position with higher accuracy.

  A plurality of indicator plates 100 may be provided as shown in FIG. In that case, a plurality of data can be obtained, and the sensor detection position can be obtained more accurately by averaging the data.

  Further, as in the index plate 100F in FIG. 15F, one side 104F of the two sides 104F and 105F facing each other is arranged close to the sewing needle 13a side, and the side 104F is placed from the facing side 105F. Is also formed so as to protrude in the cloth feeding direction, and when it is installed on the upper surface of the large pressers 41A, 41B, the binder 12 is lowered between the large pressers 41A, 41B and the sewing needle 13a is lowered, The indicator plate 100F may be placed so that 104F is along the bottom plate of the binder 12 and the vertex 106F is in contact with the sewing needle 13a. By doing in this way, it is not necessary to display the marking etc. which become a mark at the time of mounting the parameter | index plate 100F on another member. In this case, since the index plate 100F is already in a position detected by the flap sensor at the time of installation, the large pressers 41A and 41B are moved after the index plate 100F is outside the detection of the flap sensor, and the sensor is detected. It is necessary to perform position specifying processing. In this case, the base 101F, the hypotenuse 103F, and the apex 102F of the indicator plate 100F correspond to the base 101, the hypotenuse 103, and the apex 102 of the indicator plate 100, respectively.

It is a top view which shows the state immediately after the sewing of a bead stitch. The perspective view which shows the schematic structure of the whole bead stitch sewing machine concerning embodiment to invention is shown. The front view of a bead stitch sewing machine is shown. It is a perspective view of a needle up-and-down movement mechanism. It is a perspective view of a large press feed mechanism. It is a top view which shows the state by which the flap cloth was set to the upper surface of a large pressing. It is a block diagram which shows the control system of a bead stitch sewing machine. It is explanatory drawing which shows the distance of each site | part in the state in which the indicator plate moved to the cloth feed direction by a large press is detected by the 1st flap sensor. It is the detailed explanatory view which expanded the indicator plate and showed the dimension in detail. Placement of flap cloth, each flap sensor, sewing needle, and seam on the sewing start end side when placing the flap cloth on the large presser provided with the second flap sensor It is explanatory drawing which shows the relationship between this and the parameter which should be calculated by this deviation calculation process. Arrangement of flap cloth, flap sensors, sewing needles, and seams on the sewing end edge side when the flap cloth is placed on the large presser where the second flap sensor is provided and the edge is sewn. It is explanatory drawing which shows the relationship between this and the parameter which should be calculated by this deviation calculation process. It is a flowchart which shows the detail of the sensor detection position specific process based on a sensor detection position specific control program. It is a flowchart which shows the detail of the operation | movement control of each part after the sewing start based on a sewing reference position calculation program based on a sewing reference position calculation program, and the completion of a bead sewing based on a bead sewing control program. It is a flowchart which shows the process of FIG. 15A to 15F are plan views showing other examples of the indicator plate.

Explanation of symbols

10 Sewing machine 11 Table (mounting table)
13a, 13b Sewing needle 16 Sewing machine motor 30 First flap sensor 31 Light receiving element 32 Support bracket 33 Light emitting element 35 Second flap sensor 36 Light receiving element 37 Support bracket 38 Light emitting element 40 Large presser feed mechanism (cloth feed mechanism)
41 Large presser 41a Placement part 41c, 41d Reflective surface (reflective part)
45 holding motor 55 flap holding mechanism 60 operation control means (sewing control means)
61 CPU (deviation calculation unit, sewing control unit)
62 ROM
62a Sensor detection position specifying control program 62b Sewing reference position calculation program 62c Ball edge sewing control program 69 EEPROM
70 Needle up / down movement mechanism 72 Needle bar 73 Needle switching solenoid (one needle switching mechanism)
74 Needle bar holding (single needle switching mechanism)
75 Latch mechanism (one-needle switching mechanism)
79 Holding mechanism (one-needle switching mechanism)
100 Index plate E Cloth feed direction F Flap cloth C Body cloth L Straight cut N Seam T Tab

Claims (3)

A pair of left and right needle bars that hold the sewing needles individually and move up and down by the sewing machine motor;
A needle up-and-down movement mechanism for moving up and down each needle bar;
A pair of left and right large pressers that hold the body fabric on the mounting table together with the ball cloth,
A flap holding mechanism that is provided in at least one of the large pressers and holds a flap cloth on the upper surface of the large presser;
A cloth feed mechanism for moving the pair of large pressers along a predetermined cloth feed direction;
A flap end detection reflector formed on the upper surface of at least one large press provided with the flap holding mechanism along the cloth feed direction;
A flap sensor that irradiates the reflection part with light, receives the reflected light, and detects an end of the flap cloth by a change in a detection state of the reflected light by the flap cloth;
Sewing control means for performing sewing control by determining a sewing start or end position of the large presser based on the position of the large presser in the cloth feeding direction when a change in the detection state of reflected light by the flap sensor occurs. In the edge stitch sewing machine,
A state change section that causes a change in the state of reflected light detected by the flap sensor as the large press moves along the cloth feed direction is provided, and the cloth feed direction length of the state change section is the cloth. The flap sensor is configured to move the large presser in a direction along the cloth feed direction when an index member that changes inherently depending on a position in a direction orthogonal to the feed direction is installed at a predetermined position on the large presser. Section length calculation means for obtaining the cloth feed direction length of the state change section in which the state change of the reflected light caused by
Sensor detection position specifying means for specifying the detection position of the flap sensor from the position of the large press at the start or end of detection of the state change section and the cloth feed direction length of the state change section,
The sewing control means determines a sewing start or end position by reflecting the detection position of the flap sensor specified by the sensor detection position specifying means when sewing a flap cloth. sewing machine.   2. The edge stitch sewing machine according to claim 1, wherein a plurality of the reflection portions and flap sensors are provided for at least the one large presser. A pair of left and right needle bars that hold sewing needles individually and move up and down by a sewing machine motor, a needle up and down mechanism that moves each needle bar up and down, and a pair of left and right that holds the body cloth on the mounting table together with the cloth. A large holding press, a flap holding mechanism that holds a flap cloth on the upper surface of the large press, and a cloth that moves the pair of large presses along a predetermined cloth feeding direction. A feeding mechanism, a flap end detection reflecting portion formed along the cloth feeding direction on the upper surface of at least one large press provided with the flap holding mechanism, and irradiating the reflecting portion with light; A flap sensor that receives reflected light and detects an end of the flap cloth according to a change in the detection state of the reflected light by the flap cloth, and a change in the detection state of the reflected light by the flap sensor In the sewing reference position specifying method welting sewing machine and a sewing control means for the position as a reference in the cloth feeding direction of the large pressing defines a sewing start or end position of the large pressing performing sewing control when produced,
A state change section that causes a change in the state of reflected light detected by the flap sensor as the large press moves along the cloth feed direction is provided, and the cloth feed direction length of the state change section is the cloth. An installation step of installing an indicator member having a specific change depending on a position in a direction orthogonal to the feed direction at a predetermined position on the large press;
By moving the large presser in the direction along the cloth feed, the position of the large presser at the start or end of detection of the state change section and the cloth feed in the state change section where the state change of the reflected light by the flap sensor occurs. A section length calculation step for obtaining a direction length;
A sensor detection position specifying step for specifying the detection position of the flap sensor from the position of the large press at the start or end of detection of the state change section and the cloth feed direction length of the state change section;
A sewing reference position specifying step for determining a sewing start or end position at the time of sewing by reflecting the detection position of the flap sensor specified in the sensor detection position specifying step. Location method.

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