JP4913569B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine that detects the position of a sewing object by detecting reflected light.

A conventional sewing machine, for example, an edge stitch sewing machine, includes 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 cloth sewn to the body cloth together with the ball cloth. Detects the reflected light from the reflective surface formed on the upper surface of the large presser along the cloth feed direction of the fabric. (See, for example, Patent Document 1).
In the above conventional example, when sewing, the body cloth and the ball cloth are held by the large presser of the large presser mechanism, and when the flap cloth is held on the upper surface of the large presser, a part of the reflective surface of the large presser is the flap cloth. It will be in the state covered by. Thereby, the one end part and other end part of a flap cloth can be detected from the change of the light detection amount of the reflected light of the reflective surface by a flap sensor which arises at the time of the conveyance movement of the large presser in sewing.
Since the mutual distance from the flap sensor to the sewing needle is an existing value, the sewing start position and the sewing end position are determined by performing transport for the mutual distance from the cloth edge detection, and sewing is realized. It was.
Japanese Patent No. 2716970

However, in the above conventional example, the reflection surface is shielded by the flap cloth, and the cloth edge is detected from a decrease in the detection intensity of the reflected light to be detected. When a region where the belt is lowered occurs and overlaps with the fabric edge, there is a problem that the sewing start position and the sewing end position with respect to the flap cloth are displaced and the sewing quality is deteriorated.
Therefore, when scratches or dirt occur, the members constituting the reflecting surface must be replaced, but the reflecting surface of the reflecting surface is arranged facing upward and the flap cloth is placed. Minor scratches and dirt are likely to occur, and if each replacement is performed, the replacement cost of the members constituting the reflective surface will be excessive, increasing the sewing cost and reducing the work efficiency due to the interruption of the sewing work by the replacement work There was an inconvenience.

  An object of the present invention is to reduce the occurrence of erroneous sewing or misalignment of sewing without impairing economic efficiency and work efficiency.

According to the first aspect of the present invention, there is provided a sewing needle that is driven by a drive motor and moves up and down, a pair of large pressers that hold the body cloth on the mounting table together with the ball cloth, and the body cloth together with the ball cloth. A flap holding mechanism for holding a flap cloth to be held by a placing portion provided on an upper surface of the large presser, and feeding the ball cloth and the flap cloth to the sewing needle together with the body cloth. A mechanism, a light emitting element that irradiates irradiation light from above toward a reflection surface formed along the cloth feeding direction on the upper surface of the placement unit, and a light receiving element that receives reflection light from the reflection surface, A flap sensor that detects a front end and a rear end of the flap cloth held in the placement portion by an increase / decrease in the amount of reflected light received by the light receiving element upstream of the sewing needle in the cloth feed direction; Based on the positions of the front end and the rear end of the flap cloth detected by the cloth, the seam is formed at predetermined positions of the body cloth, the ball cloth and the flap cloth conveyed by the cloth feed mechanism. In an edge stitch sewing machine that performs sewing by driving a drive motor and the cloth feed mechanism, reflected light is reflected by the flap sensor when the cloth feed mechanism is moved without placing the flap cloth on the placing portion. A deterioration position data acquisition mode for storing deterioration position data in a storage means representing the conveyance position when the start and end of the decrease in the amount of light are detected as the front end portion and the rear end portion of the deterioration area of the reflecting surface; and Control means for executing a sewing mode in which the sewing is performed by detecting the front and rear ends of the flap cloth placed on the placement section with reference to the stored deterioration position data; In the sewing mode, when the flap cloth is transported by the cloth feeding mechanism in a state where it is placed on the placement section, the control means starts to reduce the amount of reflected light by the flap sensor. The sewing is started only when the detected transport position does not coincide with the front end portion of any deterioration area based on the deterioration position data.
Note that “upstream in the direction of cloth feed” indicates upstream in the direction of cloth feed during sewing.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the control unit is configured to perform conveyance in which the start of a decrease in the amount of reflected light by the flap sensor is detected in the sewing mode. Even if the position coincides with the front end of one of the deteriorated areas based on the deteriorated position data and then passes through the transport position corresponding to the rear end of the deteriorated area where the front end coincides, the flap sensor When the end of the decrease in the amount of reflected light is not detected, an error is notified and the sewing is not started.

  The invention according to claim 3 has the same configuration as that of the invention according to claim 1 or 2, and the control means is configured to convey the flap cloth after the start of sewing in the sewing mode during conveyance by the cloth feed mechanism. If the transport position when the end of the decrease in the amount of reflected light by the flap sensor is detected matches the transport position corresponding to the rear end of any of the deteriorated areas based on the deteriorated position data, an error occurs. And the drive motor is stopped to end the sewing.

  The invention according to claim 4 has a configuration similar to that of the invention according to claim 1, 2, or 3, and a conveyance region in which a decrease in the amount of reflected light by the flap sensor in the deterioration position data acquisition mode is detected. Has a deterioration state persistence determining means for determining whether or not the cloth feed mechanism is maintained longer than a predetermined transport distance, and the control means drives the drive when an affirmative determination is made by the deterioration persistence determining means. An error is notified by stopping the motor.

According to the first aspect of the present invention, the flap cloth is placed so as to shield a part of the reflection surface, whereby the light receiving element for detecting the reflected light from the reflection surface of the light emitted from the light emitting element is It is assumed that the front end portion of the flap cloth is detected by decreasing the light amount, and the rear end portion of the flap cloth is detected by increasing the light amount of reflected light.
On the other hand, if there is a deteriorated area such as dirt or peeling on the reflective surface, a decrease in the amount of reflected light is detected at the front end of the deteriorated area, and an increase is detected at the rear end of the deteriorated area, similar to the detection of the flap cloth. Is done. Therefore, in the deterioration position data acquisition mode, the area where the amount of reflected light is reduced is detected by detecting the reflected light over the entire length in the cloth feeding direction of the reflecting surface while transporting the cloth feeding mechanism without placing the flap cloth. The front end portion and the rear end portion can be regarded as the front end portion and the rear end portion of the deteriorated region existing on the reflecting surface, respectively, and can be acquired as deteriorated position data.
“Start of decrease in the amount of reflected light” indicates the start of the decrease in the reflected light detected by the shielding of the flap cloth or the decrease in the reflection surface, and “the end of the decrease in the amount of reflected light”. Is to increase from the state in which the amount of reflected light is reduced, and return to the state of reflected light detected in a state in which the flap cloth is not shielded and the reflecting surface is not deteriorated. .

And in the said structure, if the reduction | decrease and increase of the light quantity of the reflected light detected in sewing mode are collated with deterioration position data, it can be determined whether it is a deterioration area. That is, when the start of the decrease in the amount of reflected light does not coincide with the front end portion of the deterioration position indicated by the deterioration position data, the start position of the decrease in the amount of reflected light is determined as the flap cloth.
As a result, even when the reflecting surface is deteriorated, the front end portion of the deteriorated area of the reflecting surface and the front end portion of the flap cloth can be identified without replacing the reflecting surface. It is possible to improve the sewing quality while reducing the cost and the burden of replacement work.
Further, even if a deteriorated area occurs on the reflecting surface, it becomes possible to detect the end portion of the flap cloth. Therefore, it is possible to reduce the replacement frequency of the members constituting the reflecting surface and improve the economy and work efficiency. .

  According to the second aspect of the present invention, the conveyance position where the start of the decrease in the amount of reflected light by the flap sensor is detected in the sewing mode coincides with the front end of the deteriorated area, and thereafter corresponds to the rear end of the deteriorated area. If the end of the decrease in the amount of reflected light is not detected by the flap sensor even after passing the transport position, an error notification is performed. This state is a state in which the flap cloth is overlapped with the deteriorated area, and the flap cloth is positioned behind the deteriorated area. Thus, the deteriorated area and the flap cloth are shifted and overlapped. Even if this is the case, it is possible to identify this, and to avoid misalignment of sewing due to erroneous detection.

In the invention according to claim 3, error notification is performed even when the flap cloth overlaps the deteriorated area and the flap cloth is positioned forward of the deteriorated area. Thus, it is possible to prevent the sewing end position from being erroneously detected, or to recognize the occurrence of the sewing, and to detect a sewn product having a lowered sewing quality before proceeding to the next process.
If the flap sensor and the sewing needle are sufficiently separated from each other, an error notification is given before the start of sewing, and the sewing end position can be prevented from being erroneously sewn, and when the flap sensor and the sewing needle are close to each other. Can start sewing, but can find a sewing product in which the sewing end position is wrong.

In the invention according to claim 4, if the deteriorated area becomes longer, the possibility that the front end portion or the rear end portion of the flap cloth overlaps with the deteriorated area inevitably increases, and sewing is performed while avoiding the influence of the deteriorated area. However, it becomes difficult to notify the error at the stage of the deteriorated position data acquisition mode, so that the replacement of the members constituting the reflecting surface can be promoted, and a reduction in work efficiency can be avoided.
Furthermore, by limiting the length of the deteriorated area, it is possible to reduce the time required to determine whether or not the area is a deteriorated area during sewing, and to make a smooth determination.

(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. 1 is a perspective view showing an overall schematic configuration of the edge stitch sewing machine 10, and FIG. 2 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 a cloth (body cloth) C and a ball cloth (not shown) and sews them with a two needles 13 and 13 at a predetermined length, and also has two seams. This is a sewing machine that forms a linear cut along the sewing direction and further forms a V-shaped cut at both ends of the cut. Further, when the fabric C and the ball cloth are sewn, the flap fabric F is sewn on the fabric C on one of the two needles 13.
The bead-sewn sewing machine 10 includes a table 11 as a mounting table as a sewing work table and a pair of large pressers 41 extending in the cloth feeding direction of the fabric C. A large press feed mechanism 40 as a fabric feed mechanism that transports the fabric C, the ball cloth and the flap fabric F by moving the large presser 41 in the fabric feed direction and the flap fabric F sewn on the fabric C. A flap holding mechanism 55 for holding the holding portion 41a provided on the upper surface of each large presser 41, a binder mechanism for applying a binder 12 to the cloth sewn on the fabric C and folding back both sides of the cloth. Needle up-and-down moving mechanism as a sewing means for sewing the fabric C and the ball cloth fed along the X-axis direction by the large press feed mechanism 40 with the two sewing needles 13, and the downstream side in the cloth feeding direction from the sewing needle 13 A knife mechanism that raises and lowers the moving knife 14 to form a cut in the fabric C and the ball cloth, a hook mechanism that catches the sewing thread from the sewing needle 13 and entangles the lower thread, and a needle vertical movement mechanism that is installed on the table 11 Sewing machine frame 80 that stores and holds the knife mechanism, a corner knife mechanism 90 that forms a substantially V-shaped cut at positions that are both ends of the straight cut, and a large press 41 along the cloth feed direction of the cloth C A light-emitting unit that emits light toward the reflecting surface 41c formed on the upper surface of the mounting unit 41a and a light-receiving element that receives the reflected light from the reflecting surface 43c, and the reflected light received by the light-receiving unit A flap detecting means 30 as a flap sensor for detecting the front end and the rear end of the flap cloth by increasing / decreasing the amount of light, and an operation control means 60 for controlling the operation of each of the above components are provided.
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 by the sewing needle 13 on the table 11. The needle plate 15 is formed with a needle hole into which the two sewing needles 13 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 along the Y-axis direction, and the upper shaft that transmits the vertical driving force of the needle vertical movement mechanism from the sewing machine motor 16 is supported inside the arm portion 83 along the Y-axis direction. Has been.
Pulleys are fixedly mounted on the upper shaft and the lower shaft, respectively, and are connected by a timing belt passed through the vertical body portion 82 of the sewing machine frame 80.

(Needle vertical movement mechanism)
The needle up-and-down movement mechanism is capable of sliding along the longitudinal direction of two sewing needles 13 constituting two needles, two needle bars each holding the two needles 13 at the lower end, and each needle bar The upper and lower metal bearings that are supported by the needle, the needle bar holder that holds the two needle bars simultaneously, the upper shaft that is rotationally driven by the sewing machine motor 16, and the rotary weight that is fixedly connected to one end of the upper shaft and performs rotational motion And a crank rod having one end connected to a position eccentric from the rotation center of the rotary weight and the other end connected to a needle bar holder.

When the upper shaft is rotated, the rotating weight also rotates together with the upper shaft, and one end portion of the crank rod performs a circular motion around the upper shaft along with the rotating weight. At the other end portion of the crank rod, only the moving component is transmitted to the needle bar holder in the Z-axis direction of the one end portion that performs circular motion, and a reciprocating vertical movement force is applied to each needle bar.
Further, the two sewing needles 13 are arranged side by side along the Y-axis direction. And the binder 12 mentioned later is arrange | positioned at the front-end | tip part between the needle drop positions of two needles at the time of sewing, and the two needles 13 are sewn on both sides with the binder 12 in between.

(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 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 13 and downstream of the two needles 13 in the cloth feeding direction (left side in FIG. 2).
The knife motor 17 is rotationally driven together with the feeding operation of the fabric C, 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 equipped with two horizontal hooks individually corresponding to the two sewing needles 13, a hook gear provided on the rotating shaft of each horizontal hook, and a fixedly mounted on the lower shaft, and each hook gear rotates individually. And a transmission gear for applying a 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 needle when the tip of the sewing needle 13 is lowered to the lower side of the needle plate 15, and rotates in the trapped state so that the sewing thread loops through the horizontal hook. Insert the thread and entangle the sewing thread and lower thread. In this way, sewing is performed by the cooperation of the sewing needle and the horizontal hook. That is, the sewing means is constituted by the needle up-and-down moving mechanism 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) that serves as a drive source for the lifting and lowering operation of the binder 12, an electromagnetic valve 18 that drives the air cylinder (see FIG. 5), 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 located between the needle drop positions of the two needles 13. Then, in cooperation with a pair of large pressing members 41 of the large pressing feed mechanism 40 described later, the yarn is fed 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. Sewing to the fabric C is performed.

(Large press feed mechanism)
FIG. 3 is a perspective view of the large presser feed mechanism 40. As shown in this figure, the large presser feed mechanism 40 is individually disposed on the lower side of each large presser 41 and a pair of large pressers 41 that press the fabric C from above at positions on both sides of the sewing needle 13. Two laying plates 47 on which the fabric C is placed during cloth feeding, a pair of arm members 48 for holding each large presser 41 individually, and the two large pressers 41 are supported via the arm member 48 so as to be movable up and down. The support 42 to be moved, the spacing adjustment mechanism 49 of the large press 41 that enables the position of each arm member 48 held by the support 42 to be adjusted along the Y-axis direction, and the large press 41 to the support 42 in the vertical direction. An air cylinder 43 that is moved to a position, a solenoid valve 44 that controls the driving of the air cylinder 43 (see FIG. 5), and a presser motor 4 as a drive means that moves the fabric C pressed by the large presser 41 in the cloth feed direction E. When, and a ball screw mechanism 46 for transmitting and converting the rotational driving force of the pressing motor 45 to linear motion driving force along the X-axis direction to the support 42.

Each large presser 41 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 41 are arranged side by side in the Y-axis direction with the two needles 13 interposed therebetween, and are supported by the arm member 48 so that the longitudinal direction thereof is along the X-axis direction.
Furthermore, each large presser 41 is composed of a top plate and a bottom plate, and each large presser 41 has a gap that opens toward the other large presser side. A presser plate 50 that can be advanced and retracted is stored in the gap between the large pressers 41. The presser plate 50 of each large presser 41 can be reciprocated along the direction (Y-axis direction) in which the presser plate 50 of each large presser 41 is brought into contact with and separated from each other. The air cylinder 51 is driven by an electromagnetic valve 52 (see FIG. 5) controlled by the operation control means 60, and the pressing plates 50 are moved closer to each other so that both ends of the above-described ball cloth are attached to the binder 12. It is possible to fold so that it is wound and to maintain the state.

  The upper surface of each large presser 41 functions as a placement portion 41a for placing a 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. 4 is a plan view showing a state in which the flap cloth F is set on the placement portion 41 a on the upper surface of the large presser 41. As shown in FIG. 4, when a part of the reflection surface 41 c in the longitudinal direction is shielded by the flap cloth F, the flap detection means 30 detects a decrease in the reflectance of the shield part, thereby The operation control means 60 recognizes the upstream end (rear end) position and the downstream end (front end) position in the cloth feeding direction.

  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 presser 42 is 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 presser 41. ing.

  The interval adjusting mechanism 49 is provided between each arm member 48 and the support shaft 42a. Each interval adjusting 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 41 can be adjusted to an arbitrary position in the Y-axis direction via each arm member 48, and the distance between each large presser 41 can also be adjusted.

Each laying plate 47 is fixedly mounted on the support 42 while being placed on the upper surface of the table 11 below the large presser 41, and moves along the cloth feed direction E together with the large presser 41. Each laying plate 47 extends along the X-axis direction and is set to have approximately the same width as the large presser 41 in the Y-axis direction. Each laying plate 47 is arranged with the two needles 13 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 each large presser 41 descends to hold the fabric C in a sandwiched state. In other words, each laying plate 47 is provided on the lower side of the cloth C, and protects it from sliding directly on the upper surface of the table 11 when the cloth C is conveyed.

The air cylinder 43 can switch each large presser 41 between an upper position and a lower position via an arm member 48 by an electromagnetic valve 44, and each large presser 41 is separated from the upper surface of the laying plate 47 in the upper position. In the lower position, each large presser 41 is lowered to the height of the upper surface of the laying plate 47. 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 in the X-axis direction by driving the presser motor 45. It is possible.

(Flap holding mechanism)
As shown in FIG. 3, the flap holding mechanism 55 is individually provided on the upper surface of each large presser 41. Each flap holding mechanism 55 is flapped by a flap pressing member 56 that is pivotally supported by an arm member 48 so as to be able to contact and separate from the upper surface of the large pressing member 41, and an air cylinder 57 that applies rotational force to the flap pressing member 56. The cloth F is held and released.
The flap holding mechanism 55 is for holding the sewing end of the flap cloth F along the X-axis direction, and the sewing end of the flap cloth F moves the large pressers 41. Occasionally, the flap cloth F is held so as to pass the needle drop position of one sewing needle 13. And the flap cloth F is hold | maintained at the flap holding | maintenance mechanism 55 in the state which covers the reflective surface 41c of the large presser 41 from the top over the longitudinal direction full length of the said flap cloth F concerned.
The flap holding mechanism 55 is provided for each large presser 41, but only one of them is selected and used during the sewing operation of the flap cloth F.

(Flap detection means)
Two flap detection means 30 are provided corresponding to the reflection surfaces 41 c of the large pressers 41, and are provided side by side along the Y-axis direction on the front side of the arm portion of the sewing machine frame 80. Each of these flap detection means 30 is provided above the movement path of each large presser 41 and upstream of the two needles 13 in the cloth feeding direction (right side in FIG. 2).
Each flap detection means 30 detects the reflected light of the light emitting element 33 that irradiates irradiation light from above and the reflection light of the reflection surface 41c toward the reflection surface 41 of the large presser 41, and controls the operation of the detection signal. A light receiving element 31 for inputting to the means 60 and a support bracket 32 for supporting the light receiving element 31 on the outer surface of the sewing machine arm 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 downward and supports the reflective surface 41c of the large presser 41, and the light receiving element 31 emits light downward to reflect light from the reflective surface 41c. Is supposed to be detected.

(Corner knife mechanism)
The corner knife mechanism 90 is disposed below the table 11 and downstream of the moving knife 14 in the passage path of the large presser 41 by the large presser feed mechanism 40 (left side in FIG. 2). A substantially V-shaped cut V is formed at a position that becomes both ends of the straight cut by passing the corner knife 91 from below through the cloth C conveyed to the work position of the corner knife 91 by the press feed mechanism 40.
That is, the corner knife mechanism 90 includes an air cylinder 92 that moves the corner knife 91 up and down, an electromagnetic valve 93 that drives the air cylinder 92, and a drive motor 94 that moves and positions the corner knife 91 along the X-axis direction. I have.

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.
That is, when the fabric C and the ball cloth in which the seam and the linear cut are formed are conveyed to a predetermined position downstream of the moving knife 14 in the cloth feeding direction E by the large press feed mechanism 40, the corner knife 91. Is positioned and raised at a lower position on one end side of the cut, and then the corner knife 91 is positioned and raised at a lower position on the other end side of the cut to form two V-shaped cuts V.

(Control system for hem stitch machine)
FIG. 5 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 a mode selection button (not shown), and deteriorated position data for executing a sewing mode in which sewing can be executed and a deteriorated position data acquiring process executed by a deteriorated position data acquiring program 62a described later. The acquisition mode can be selected.
The start switch 66 is a means for inputting the start of sewing in the sewing mode. When the start switch 66 is input, the input by the operation pedal 68 becomes 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 is connected to a sewing machine motor 16, a presser motor 45, a female motor 17, and a corner knife drive motor 94, which are objects of control, via drivers 16a, 45a, 17a, and 94a, respectively.
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 presser 41, an air cylinder 51 that operates the presser plate 50, an air cylinder 57 that holds the flap cloth F, Solenoid valves 18, 44, 52, 58, 93, 20 for controlling the operation of the air cylinder 92 for moving up and down the corner knife 91 and the air cylinder 92 for switching between the standby state and the usable state of the moving knife 14 are drivers 18 a, 44 a, 52 a. , 93a, 20a.
Further, each light emitting element 33 (only one is shown in FIG. 5) of the flap detecting means 30 is connected to the operation control means 60 via a power supply circuit 33a, and each light receiving element 31 (only one is shown in FIG. 5). Are connected via an interface 31a.
Further, the operation control means 60 includes an origin sensor 19 of a large press 41 for detecting a detected portion (not shown) provided at the downstream end of the support base 42 of the large press feed mechanism 40 in the cloth feed direction. 19a is connected. The origin sensor 19 is arranged so as to detect the detected portion when the large presser 41 is conveyed to the end point near the end of the cloth feeding direction or close to the end point, and the operation control means 60 uses the detected position as the origin. The conveyance movement amount of the large presser 41 is obtained by counting the rotation angle of the presser motor 45 from the above.

  The operation control means 60 includes a CPU 61 that performs various controls, a ROM 62 that stores a later-described deterioration position data acquisition program 62a, an operation control program 62b, various setting data for performing sewing of the flap cloth F, and the like. A RAM 63 for storing various data relating to the processing of the CPU 61 in a work area, and an EEPROM 69 as storage means for storing various data relating to sewing and deterioration position data described later.

  In the EEPROM 69, the relative positional relationship of each light receiving element 31, the sewing needle 13, and the moving knife 14 in the cloth feeding direction is stored as position data. Thereby, when the front end part (downstream end part in the cloth feed direction) and the rear end part (upstream end part in the cloth feed direction) of the flap cloth F are detected by the light receiving element 31, the CPU 61 refers to the position data and ends the end part. It is determined how much distance is conveyed from the detection and then sewing is started or finished, and similarly, how much distance is conveyed from the start of sewing and cloth cutting is started or finished.

(Deterioration position data acquisition process)
FIG. 6 is an explanatory diagram showing an example of deterioration position data acquired when the reflected light is detected by the light receiving element 31 with respect to the reflection surface 41c having three deterioration regions D such as dirt. Based on FIG. 6, the deterioration position data acquisition process executed by the deterioration position data acquisition program 62a will be described in detail. In FIG. 6, the large presser 41 is conveyed toward the right side.
When the above-described deterioration position data acquisition mode is selected, the CPU 61 causes the deterioration position data acquisition program 62a to apply each large presser 41 in the state in which the flap cloth F is not set from the upstream end portion to the downstream end portion in the cloth feeding direction. The drive control of the pressing motor 45 is performed so that the substantially entire length of each reflecting surface 41c passes under the corresponding light receiving element 31. At that time, the output of each light receiving element 31 is stored in association with the position of the large presser 41 in the cloth feeding direction. That is, the movement distance of the large presser 41 from the origin position in the large presser feed mechanism 40 and the detection output at each distance are stored in association with each other.
The degraded position data acquisition program 62a functions as a degraded position data acquisition unit when executed by the CPU 61. It should be noted that the deterioration position data acquisition program 62a may be set so that the deterioration position data acquisition mode is automatically executed when the main power supply of the edge stitch sewing machine 10 is turned on.
The CPU 61 identifies the output of each light receiving element 31 with two gradations of “detected” and “not detected” of reflected light based on a predetermined threshold. The identification in the output of the light receiving element 31 is not limited to when the deterioration position data acquisition mode is executed, but is the same when the sewing mode is executed.

As shown in FIG. 6, in the portion where the reflection surface 41 c is not deteriorated, the irradiation light of the light emitting element 33 is appropriately reflected and a high sensor output indicating detection of the reflection light is shown, but the deterioration region D of the reflection surface 41 c is shown. Shows a low sensor output indicating that the light emitted from the light emitting element 33 is not properly reflected and the reflected light is not detected.
Through the above processing, deterioration position data indicating the presence or absence of deterioration is acquired over the entire length of the reflection surface 41 c of the large presser 41. Further, in the above processing, when the start of the decrease in the amount of reflected light is detected, the transport positions S1, S2, and S3 are set as the front end portions of the respective degradation regions D, and the end of the decrease in the amount of reflected light is detected. The transfer positions E1, E2, E3 are stored in the deterioration position data as the rear end of each deterioration region D. Note that when the start of the decrease in the amount of reflected light is detected, the conveyance position S1 is set so that it can be treated as one deterioration area until the end of the decrease in the amount of reflected light detected first. E1, transport positions S2 and E2, and transport positions S3 and E3 are associated and recorded in the degradation position data.
Further, the deterioration position data is acquired for each reflection surface 41 c of each large presser 41 and stored in the RAM 63.

In the deterioration position data acquisition process, the length of each deterioration area in the cloth feeding direction is obtained, and when this exceeds the allowable range, an error is notified and the process is stopped. That is, in the reflected light detection, when a fall (start of decrease in the amount of reflected light) is detected, the distance in the cloth feed direction until the next rise (end of decrease in the amount of reflected light) is detected. As a result of comparison with a preset allowable value, an error is displayed on the display panel 64 if it is exceeded. Thereby, the operator of the sewing machine can be urged to replace the members constituting the reflecting surface 41c.
In other words, the deterioration position data acquisition program 62a functions as a deterioration state continuation determination unit that determines whether or not the deterioration region lasts longer than a preset conveyance distance by being executed by the CPU 61.

  As described above, the limitation on the length of the deteriorated region is that if there is a long deteriorated region, it is no longer possible to accurately detect the end portion of the flap cloth F. Therefore, the members constituting the reflecting surface 41c must be replaced. When the leading edge and the trailing edge position of the deteriorated area stored in the deterioration position data coincide with each other, the deterioration is not detected when the trailing edge and the rising edge are detected in the processing by the operation control program described later. In order to perform the process of recognizing the area, if the distance from the front end position to the rear end position of the deteriorated area stored in the deteriorated position data is excessively long, the detected rising edge is recognized as being caused by the flap cloth F. This is because the rising position may already pass below the sewing needle 13 at the time, and it is necessary to avoid such a situation.

(Operation control program)
FIG. 7A shows a case where the flap cloth F is properly detected when the flap cloth F is placed on the reflecting surface 41c having the degradation region D shown in FIG. 6, and FIG. 7B and FIG. (C) is an explanatory view showing a case where an error occurs. The operation control process executed by the operation control program 62b will be described in detail based on FIG. In FIG. 7, the large presser 41 is conveyed toward the right side.

  By this operation control program 62b, the CPU 61 monitors the detection output of the reflected light from the reflecting surface 41c by the light receiving element 31 when the large presser 41 on which the flap cloth F is placed is conveyed in the cloth feeding direction, and reflects the reflected light. When a decrease in the amount of reflected light indicating a change from “with detection” to “without detection” (hereinafter referred to as “falling”) of light is detected, this is indicated as the front end portion or the degradation region of the flap cloth F. D is recognized as the front end of D, and when an increase in the amount of reflected light indicating a change from “no detection” to “with detection” (hereinafter referred to as “rising”) of the reflected light is detected, this is flapped. It is recognized as the rear end portion of the fabric F or the rear end portion of the deteriorated region D.

Further, when the CPU 61 detects the fall of the detection output of the light receiving element 31 by the operation control program 62b, the CPU 61 detects the deterioration position data acquired in the deterioration position data acquisition process in the cloth feed direction of the front end portion for each deterioration region D. It is determined whether the positions S1, S2, and S3 coincide with each other, and if they coincide with any of the positions, the rise is detected when the large presser 41 is conveyed to the position E1, E2, or E3 at the rear end of the corresponding degradation region D. It is determined whether or not.
For example, when both the front end portion and the rear end portion are detected for one deteriorated region D as in the case where the rise is detected at the position E1 after the fall is detected at the position S1, from the fall It is determined that the detection output decrease period until the rise is due to the degradation region D. Then, when the CPU 61 determines that the detection of the rise or the fall is due to the deteriorated region D, the CPU 61 ignores the start or end of sewing without triggering it.
In the above determination, whether or not the detected rising edge or falling edge coincides with each of the positions S1, S2, S3, E1, E2, and E3 is determined within a predetermined allowable error range. Is called.

  Furthermore, although the operation control program 62b determines that the falling edge of the detection output of the light receiving element 31 matches the front end position of each deterioration region D, the CPU 61 determines the rear end portion of the corresponding deterioration region D. When the rising edge is not detected at the position E1, E2 or E3, the CPU 61 performs error processing. Error processing in this case is performed by displaying an error display or message on the display panel 64. Moreover, you may carry out by providing an audio | voice output means and generating an error audio | voice.

  Further, according to the operation control program 62b, when the trailing edge of the detection output of the light receiving element 31 does not coincide with the front end position of each deterioration region D, the CPU 61 performs a process of starting the sewing. That is, after the trailing edge is detected, the cloth is fed in accordance with the distance from the light receiving element 31 to the sewing needle 13, and then sewing is started by driving the sewing machine motor 16, and the sewing needle 13 to the moving knife 14 are further started. After the cloth is fed according to the distance, operation control is started to start cutting by driving the knife motor 17 or the electromagnetic valve 20 of the air cylinder for moving knife raising and lowering.

Then, when a rising edge is detected thereafter, the CPU 61 determines whether or not it coincides with the position E1, E2, E3 of the rear end portion of any one of the degradation regions D. If they do not coincide with each other, it is recognized that the rising is caused by the rear end portion of the flap cloth F, and after the rising is detected, the cloth is fed according to the distance from the light receiving element 31 to the sewing needle 13, and then the sewing machine motor 16 Operation control for stopping the driving and stopping cutting by driving the knife motor 17 or the solenoid valve 20 of the air cylinder for moving knife raising / lowering after the cloth is fed according to the distance from the sewing needle 13 to the moving knife 14 is performed. Execute. Further, the cutting is performed by the subsequent corner knife to complete the sewing.
On the other hand, when the rising edge coincides with the position E1, E2, E3 of the rear end portion of one of the deteriorated regions D, the CPU 61 controls the operation of the sewing end, the cutting end, and the corner knife cutting similarly to the case of the mismatch. Is executed and error processing is performed.
In this case, the sewing end position shifts due to the deteriorated region D. However, since the sewing has been completed within the range where the edge sewing should be executed, an error occurs after visually confirming the actual sewing position shift. In order to make it possible to determine whether the allowable range is within the allowable range, the edge stitching is completed.

By the processing based on the operation control program 62b, both the front end portion and the rear end portion of the flap cloth F are placed on the large presser 41 without overlapping any one of the degradation regions D as shown in FIG. In this case, since the successive falling and rising coincide with each of the front end and the rear end of one degradation region D, it is determined as the degradation region, so that the front end and the rear end of each degradation region D The front end portion and the rear end portion of the flap cloth F can be identified without being misidentified.
In addition, when the front end portion of the flap cloth F is placed on the large presser 41 in a state where it overlaps with one of the deteriorated regions D as shown in FIG. 7B, the trailing edge falls on the front end portion of the deteriorated region. Although it coincides but the rising edge at the rear end of the deteriorated area is not detected, it can be determined that the flap cloth F and the deteriorated area D overlap with each other. Can be notified. In this case, treatment such as re-setting the flap cloth F is possible.
Further, when the rear end portion of the flap cloth F is placed on one of the deterioration areas D as shown in FIG. 7C and is placed on the large presser 41, the trailing edge falls in any deterioration area. Will not start overlapping, so sewing will start. However, if the rising edge coincides with the rear end of the deteriorated area, it can be determined that the flap cloth F and the deteriorated area D overlap. The operator can be notified of the execution. In this case, if the occurrence of the sewing failure can be recognized and it is within the allowable range of deviation, the work time consumed for sewing can be saved.

(Sewing operation of the edge stitch sewing machine)
FIG. 8 is a flowchart showing a series of processes from the main power supply of the sewing machine to the completion of sewing executed by the deterioration position data acquisition program 62a and the operation control program 62b.
First, when the deterioration position data acquisition mode is selected, the pressing motor 45 of the large presser feed mechanism 40 starts to be driven by the deterioration position data acquisition program 62a, and the flaps are placed on the flap cloth placement portions 41a of the large pressers 41. In the state where the cloth F is not placed, the conveyance of each large presser 41 and the detection of reflected light by the light receiving element 31 are performed, and the output of each light receiving element 31 is stored in association with the position of the large presser 41 in the cloth feeding direction. (Step S1).

In step S2, it is determined whether or not the trailing edge of the sensor signal of the light receiving element 31 is detected. If not detected, the process proceeds to step S8 (NO in step S2). It is temporarily recorded in the RAM 63 as the front end.
Further, when the front end portion of the deteriorated area is recorded, it is determined whether or not the rising edge of the sensor signal of the light receiving element 31 is detected (step S3). If not detected, the process proceeds to step S4. The transport position is temporarily recorded in the RAM 63 as the rear end of the deteriorated area, and the process proceeds to step S5.

In step S4, it is determined whether or not the large presser 41 has reached the most forward position. If not, the process returns to step S3, and if it has reached, the front end of the deteriorated area is detected. Accordingly, the rear end portion is not detected and the maximum forward position of the large press has been reached, error processing is executed, and the processing is terminated (step S6).
Here, without performing error processing, the most advanced position of the large presser 41 may be temporarily recorded in the RAM 63 as being regarded as the rear end portion of the deterioration region, and the processing may be advanced to step S5.

In step S5, the distance between the transport position recorded in the RAM 63 as the front end of the deteriorated area and the transport position recorded in the RAM 63 as the rear end of the deteriorated area is an allowable value (deterioration state continuation determination means). In step S6, an error notification is made and the process is terminated. If it is within the allowable range, the degradation position data obtained by adding the range from the transport position at the front end portion to the transport position at the rear end portion of the degradation area recorded in the RAM 63 as one degradation area is recorded in the EEPROM 69 (step S7), the process proceeds to step S8.
Then, it is determined whether or not the large presser 41 has reached the most forward position (step S8). If not reached, the process returns to step S2, and if reached, the process proceeds to step S9.
By the processing from the above steps S2 to S8, the processing is performed in parallel for each of the reflection surfaces 41c of each large presser 41, and the degradation position data is individually generated.

Next, the sewing operator selects the sewing mode, inputs from the setting switch 66 whether to place the flap cloth F on the left or right large presser 41, and inputs the start switch 66 and the operation pedal 68. Then, the holding motor 45 is activated, and operation control is performed to move the large presser 41 to the use start position (a predetermined position where the fabric C is set).
Further, when the sewing machine operator sets the fabric C on the lower side of each large presser 41 and the ball cloth is set on the upper side of each large presser 41, the air cylinder is connected via each solenoid valve 44, 52, 18. The air cylinders 43 and 51 and the binder are driven to hold the fabric C and the ball cloth. Further, when the flap cloth F is set on the placement portion 41a on the upper surface of one large presser 41, the air cylinder 57 is driven via the electromagnetic valve 58, and the flap cloth F is held.
Then, the holding motor 45 is driven, and the large presser 41 is controlled to move forward from the use start position in the cloth feeding direction E (step S9).

  When the large presser 41 moves forward, the position of the large presser 41 in the cloth feeding direction is detected, and it is determined whether or not the fall of the output of the light receiving element 31 has been detected (step S10). Then, when the output falling is not detected, the monitoring process is continued, and when the output falling is detected, it is determined whether the position of the large presser 41 in the cloth feeding direction coincides with the front end portion of any deterioration region D. Performed (step S11).

If they coincide with each other (step S11: YES), it is determined whether or not the position of the large presser 41 in the cloth feeding direction has passed the rear end portion of the corresponding degradation region D (step S12).
If it has not yet passed through the rear end of the deteriorated region D, the large pressing movement continues until it passes, and if it passes, the state where the output of the light receiving element 31 falls continues. When it is determined whether or not the falling state continues (step S13: YES), the front end portion of the flap cloth F overlaps the deterioration region D (see FIG. 7B). Is displayed as an error process, and the process is terminated (step S14).
Further, when the rising of the output of the light receiving element 31 is detected in the process of step S13 (step S13: NO), the current position of the large presser 41 coincides with the corresponding rear end position of the degradation region D. Therefore, the degradation region D is identified, and the process returns to step S10 to determine whether or not the fall of the output of the next light receiving element 31 is detected (see FIG. 7C).

Further, in the process of step S10, when the position of the large presser 41 when the falling of the output of the light receiving element 31 is detected does not coincide with the front end of any of the deteriorated regions D (step S11: NO) ), The trailing edge is recognized as being due to the front end of the flap cloth F, and sewing of the edge stitch is started (see step S15, FIG. 7C).
That is, after the cloth feed is performed according to the distance from the light receiving element 31 to the sewing needle 13, sewing is started by driving the sewing machine motor 16, and further, the cloth feed according to the distance from the sewing needle 13 to the moving knife 14. After the operation is performed, operation control for starting cutting is executed by driving the knife motor 17 or the solenoid valve 20 of the air cylinder for moving the moving knife up and down.

Further, after the start of sewing, it is determined whether or not the rising of the output of the light receiving element 31 has been detected (step S16).
The same process is repeated until the rising edge of the output of the light receiving element 31 is detected. When the rising edge of the output of the light receiving element 31 is detected, the current position of the large presser 41 is set to one of the degradation regions D. It is determined whether or not it matches the rear end position (step S17).
As a result, when they coincide with each other (step S17: YES), an error display by error processing is assumed that a state in which the rear end portion of the flap cloth F overlaps the deterioration region D (see FIG. 7C) has occurred. Performed (step S18). Then, as in the normal case, after the sewing and cutting with the moving knife 14 are performed to the end position (step S19), the post-processing is performed until the cutting with the corner knife (step S20), and the processing is completed. Become.

  On the other hand, in the determination of step S16, the position of the large presser 41 when the rising of the output of the light receiving element 31 is detected does not coincide with the rear end position of any of the degradation regions D (step S17: NO). ) Assuming that the rear end portion of the flap cloth F is properly detected (see FIG. 7A), the sewing is finished at the sewing end position based on the rear end portion of the flap cloth F (step S19). After the cutting with the moving knife 14 is ended at the cutting end position, the cutting is performed with the corner knife as post-processing (step S20), and the processing is completed.

(Effect of the embodiment of the invention)
In the edge stitch sewing machine 10, the position where the amount of reflected light detected by the operation control program 62 b decreases and the position where the reflected light increases will be the front end of any one of the deterioration areas D stored in the deterioration position data. Since the deterioration region D or the flap cloth F is identified based on whether or not it coincides with both the rear end portion and the positional deviation of the sewing start position and the sewing end position due to the deterioration region, the flap cloth F can be effectively avoided. Even when any one of the end portions is placed in the degraded region D in an overlapping manner, it is possible to identify this and perform error processing.
Therefore, it is possible to reduce the occurrence of misalignment and to recognize the occurrence of the misalignment by error notification even if the misalignment occurs. Thereby, it is possible to improve the sewing quality.
Further, even if a deteriorated area occurs on the reflection surface 41c, the end of the sewing product can be detected. Therefore, the replacement frequency of the members constituting the reflection surface can be reduced, and the economy and work efficiency can be improved. It becomes.

  Further, as in the processing of step S12 shown in FIG. 8, after the falling edge coincides with the front end portion of the deteriorated area D, it is determined whether or not it coincides with the rear end portion of the deteriorated area after waiting for detection of the rising edge. Rather, after detecting the falling edge, it is determined whether or not the rear end position of the deteriorated region has been passed in a state where no rising edge has been detected. It becomes possible.

In addition, since error processing is performed when a deteriorated area longer than the predetermined length is detected by the process of step S6 of the deteriorated position acquisition program 62a, it is difficult to perform sewing while avoiding the influence of the deteriorated area. By notifying the error at the stage of the position data acquisition process, it is possible to prompt the replacement of the members constituting the reflection surface 41c, and avoid a reduction in work efficiency.
Furthermore, by limiting the length of the deteriorated area D, it is possible to reduce the time required for determining whether or not the area is the deteriorated area D at the time of sewing and to make a smooth determination.

(Other)
The deterioration position acquisition process may be performed immediately after the main power is turned on, or the operation control unit 60 may execute the deterioration position acquisition process when the main power of the sewing machine 10 is turned off and then turn off the power. . Furthermore, the operation control means 60 may perform the degradation position acquisition process periodically.

  The large presser feed mechanism 40 includes a pair of laying plates 47, but the laying plates 47 are not essential. However, in the process of calculating the amount of displacement, since the large presser 41 is moved in a state where the fabric is not set below each large presser 41, the lower surface of each large presser 41 and the table 11 are damaged. In order to prevent the occurrence, it is desirable to apply an unnecessary cloth.

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 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 example of the degradation position data acquired when the detection of the reflected light by a light receiving element is performed with respect to the reflective surface which has a degradation area | region in three places. FIG. 7A shows a case where proper detection of the flap cloth is performed when the flap cloth is placed on the reflecting surface having the deteriorated region shown in FIG. 6, and FIG. 7B and FIG. FIG. 6 is an explanatory diagram showing a case where an error occurs. It is a flowchart which shows a series of processes until the completion of sewing after the main power supply of a sewing machine performed by a deterioration position data acquisition program and an operation control program.

Explanation of symbols

10 Sewing machine 11 Table (work table)
13 Sewing needle 30 Flap detection means (cloth position sensor)
31 Light receiving element 33 Light emitting element 40 Large presser feed mechanism (cloth feed mechanism)
41 Large presser 41c Reflective surface 45 Presser motor (drive means)
60 Operation control means (control means)
61 CPU
62 ROM
62a Position shift amount calculation program 62b Operation control program 63 RAM (storage means)
C Cloth F Flap Cloth

Claims (4)

A sewing needle that is driven by a drive motor and moves up and down;
A pair of large pressers for holding the body cloth on the mounting table together with the ball cloth, and a flap holding for holding a flap cloth sewn to the body cloth together with the ball cloth at the mounting portion provided on the upper surface of the large presser foot A cloth feed mechanism that transports the ball cloth and the flap cloth to the sewing needle together with the body cloth,
The light receiving element that irradiates irradiation light from above toward the reflecting surface formed along the cloth feeding direction on the upper surface of the placement unit and a light receiving element that receives the reflected light from the reflecting surface. A flap sensor that detects a front end and a rear end of the flap cloth held in the placing portion by increasing / decreasing the amount of the received reflected light upstream of the sewing needle in the cloth feeding direction;
Based on the positions of the front and rear ends of the flap cloth detected by the flap sensor, stitches are formed at predetermined positions of the body cloth, the ball cloth and the flap cloth conveyed by the cloth feed mechanism. In the stitch stitch sewing machine which performs sewing by driving the drive motor and the cloth feed mechanism,
When the cloth feed mechanism is moved without placing the flap cloth on the placing section, the conveyance position when the start and end of the decrease in the amount of reflected light is detected by the flap sensor is reflected on the reflection position. The deterioration position data acquisition mode for storing the deterioration position data represented as the front end portion and the rear end portion of the deterioration area of the surface in the storage means and the stored deterioration position data with reference to the stored deterioration position data. Control means for executing a sewing mode for detecting the front and rear ends of the flap cloth and performing the sewing,
In the sewing mode, when the flap cloth is transported by the cloth feed mechanism in a state where it is placed on the placement section, the control means starts to reduce the amount of reflected light by the flap sensor. The edge stitch sewing machine, wherein the sewing is started only when the detected conveyance position does not coincide with the front end portion of any one of the deterioration areas based on the deterioration position data.   The control means, in the sewing mode, the transport position where the start of a decrease in the amount of reflected light by the flap sensor is detected coincides with the front end portion of any deterioration region based on the deterioration position data, and then If the flap sensor does not detect the end of the decrease in the amount of reflected light even after passing through the transport position corresponding to the rear end of the deteriorated region where the front end matches, an error is reported and The sewing machine according to claim 1, wherein the sewing is not started.   The control means is configured such that the conveyance position when the end of the decrease in the amount of reflected light by the flap sensor is detected during conveyance by the cloth feeding mechanism of the flap cloth after the start of sewing in the sewing mode is the deterioration. 2. The sewing machine according to claim 1, wherein when it coincides with a conveyance position corresponding to a rear end portion of any deterioration area based on position data, an error is notified and the drive motor is stopped to end the sewing. 2. The edge stitch sewing machine according to 2. Deterioration state continuation determining means for determining whether or not a conveyance region in which a decrease in the amount of reflected light by the flap sensor is detected in the deterioration position data acquisition mode lasts longer than a predetermined conveyance distance by the cloth feeding mechanism. Have
4. The sewing machine according to claim 1, wherein the control means stops the drive motor and notifies an error when an affirmative determination is made by the deterioration continuation determining means.

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