JP2007289586A - Piping sawing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability of threading a needle in a piping sawing machine for performing flap detection. <P>SOLUTION: An arm member 22 and a flap sensor 31 are freely disjunction movable in the horizontal direction against an arm part 83 of a sawing machine main body by fixing the flap sensor 31 to the arm member 22. Thus, the arm member 22 and the flap sensor 31 integrally move and are separated from a thread guide 17 by turning a binder 12 in the horizontal direction in threading a needle, so that the workability of threading a needle for threading the thread guide 17 and a needle 13 provided at a tip of the arm part 83 of the sawing machine with thread. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an edge stitch sewing machine that performs flap detection.

A conventional garment sewing machine is sewn to a garment cloth together with a large presser mechanism (cloth movement mechanism) having a pair of large pressers that holds and conveys the garment cloth on the mounting table together with the rim cloth. The rim cloth is arranged on the body cloth by a binder having a flap holding mechanism for holding the flap cloth on the large presser, a sewing means for sewing the cloth to be conveyed, and a bottom plate portion and a standing plate portion. A binder mechanism and a flap sensor that detects reflected light from a reflecting surface provided on the upper surface of the large presser along the cloth conveyance direction (see, for example, Patent Document 1).
In the above-mentioned conventional example, when sewing, the body cloth and the ball cloth are held by the large press of the large press mechanism, and when the flap cloth is held on the upper surface of the large press, a part of the reflection surface of the large press is the flap cloth. It will be in the state covered by. This makes it possible to detect one end portion and the other end portion of the flap cloth from the change in the amount of reflected light from the reflection surface detected by the flap sensor when the large presser is moved during sewing. .
Then, since the mutual distance from the detection position of the flap cloth edge of the flap sensor (the attachment position of the flap sensor) to the sewing needle is an existing value, by carrying the distance between the cloth edge detection and the mutual distance. The sewing start position and sewing end position were determined and sewing was realized.
Japanese Patent No. 2716970

By the way, the upper thread is supplied to the sewing needle of the bead stitch sewing machine through the thread guide of the upper thread path provided outside the sewing machine main body.
However, in the bead stitch sewing machine disclosed in Patent Document 1, a flap sensor for detecting an end portion of the flap cloth is fixedly attached in the vicinity of the sewing needle on the upstream side in the cloth feeding direction of the sewing machine body. Therefore, the flap sensor is obstructed when the upper thread is passed through the sewing needle, and there is a problem that the threading operation is difficult.
In addition, the above-mentioned bead-sewn sewing machine has two sewing machines arranged side by side in the longitudinal direction of the sewing machine arm perpendicular to the sewing direction in order to detect the end of the flap cloth sewn to either the left or right side in the cloth feeding direction. Although two flap sensors are provided, the detection position of the end of the flap cloth, i.e., the end position of the flap cloth in the cloth feeding direction downstream and upstream ends, i.e., the sewing start position and the sewing end position is improved. When the attachment position of the flap sensor is made closer to the sewing line, the gap between the two sensors is reduced, and the threading workability is further deteriorated.

  An object of the present invention is to improve the workability of threading.

  In order to solve the above-mentioned problem, the invention described in claim 1 has two sewing needles that are moved up and down by a spindle motor, and two parallel stitches are formed by moving these two sewing needles up and down. A sewing machine main body to be formed, a thread guide that is disposed at a front end portion of the sewing machine arm portion and upstream of the two sewing needles in the cloth feeding direction, and guides the yarn to the two sewing needles; A long bottom plate portion extending in the direction and a standing plate portion erected from the bottom plate portion, and supported so as to be movable up and down on the upstream side in the cloth feeding direction of the two sewing needles, and in the lowered position A body cloth and balls placed on a sewing machine table by lowering a binder for arranging a ball edge cloth on the top and a pair of large pressers extending in the cloth feeding direction on both sides of the binder at the lowered position Press and hold the edge fabric from above and feed the large presser A cloth movement mechanism that conveys the body cloth and the ball cloth by moving in the direction, a flap holding mechanism that holds the flap cloth sewn on the body cloth and the ball cloth on the upper surface of the large presser, and the two Arranged upstream of the sewing needle in the cloth feed direction, when the large presser is moved in the cloth feed direction by the cloth moving mechanism, from above toward the reflecting surface formed on the upper surface of the large presser A flap sensor for detecting the end position of the flap cloth by irradiating light and detecting the reflected light, and sewing by the sewing machine body based on the end position of the flap cloth detected by the flap sensor In a bead stitch sewing machine that determines a start position or a sewing end position and sews the flap cloth on the body cloth and the bead cloth, the flap sensor is connected to the sewing machine arm portion. Characterized in that it comprises an arm member that disjunction movably held from the mounting position.

  According to a second aspect of the present invention, in the first aspect of the invention, the arm member is supported so that the base end portion of the arm member is rotatable at a position downstream of the two sewing needles in the cloth feeding direction. It extends toward the upstream side in the cloth feeding direction through the vicinity of the two sewing needle side ends of the sewing machine body, and supports the flap sensor together with the binder and is rotated around a support member. Thus, the binder is separated from the upstream position of the two sewing needles in the cloth feeding direction and the operating position where the two sewing needles can move up and down in the cloth feeding direction upstream. It is possible to move to a retreat position.

  The invention according to claim 3 is the invention according to claim 2, wherein the arm member moves the binder from the operating position to the retracted position in a horizontal direction.

  The invention according to claim 4 is the invention according to claim 2, wherein the arm member moves the binder from the operating position to the retracted position in the up-down direction.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the flap sensor is provided side by side corresponding to each of the large pressers, and at least one of them is provided. It is held by the arm member.

  According to the first aspect of the present invention, the flap sensor that detects the end portion of the flap cloth that is held by the flap holding mechanism and is conveyed by the large press of the cloth moving mechanism is used as the cloth feed direction of the two sewing needles in the sewing machine body. It is possible to move freely away from the upstream end. That is, when passing the thread through the sewing needle, the flap sensor can be separated from the thread guide that guides the thread to the sewing needle, so that the flap sensor does not hinder the threading operation. Therefore, for example, the threading workability can be improved as compared with a conventional hem stitch sewing machine in which two flap sensors are attached to the tip position of the sewing machine arm portion close to the thread guide.

  According to the invention described in claim 2, the flap sensor attached to the arm member is rotated around the support member together with the binder supported by the arm member. That is, when the binder is separated from the sewing machine main body, the flap sensor supported by the arm member that supports the binder is separated from the yarn guide disposed at the tip of the sewing machine arm portion. This improves the threading workability. Further, since the flap sensor is attached to the arm member, the binder and the flap sensor can be simultaneously opened and closed, so that both the binder and the flap sensor can be separated from the sewing machine main body by one rotation operation. . That is, when passing the thread through the sewing needle, it is not necessary to separately move the binder and the flap sensor away from the sewing machine main body, and both the binder and the flap sensor can be moved away from the sewing machine main body by one rotation. Therefore, the workability of threading can be further improved.

  According to the invention described in claim 3, in addition to obtaining the same effect as that of the invention described in claim 2, in particular, the arm member is rotated in the horizontal direction to move the binder from the operating position to the retracted position. Move. That is, the flap sensor attached to the arm member is rotated and moved in the horizontal direction with respect to the sewing machine body together with the arm member. That is, by moving the arm member in the horizontal direction, the flap sensor can be moved away from the sewing machine body, and the workability of threading can be improved.

  According to the fourth aspect of the invention, the same effect as that of the second aspect of the invention can be obtained, and in particular, the arm member is rotated in the vertical direction to move the binder from the operating position to the retracted position. Move. That is, the flap sensor attached to the arm member is rotated and moved in the vertical direction with respect to the sewing machine body together with the arm member.

  According to the fifth aspect of the present invention, the same effect as that of any one of the first to fourth aspects of the present invention can be obtained, and in particular, the flap sensor individually corresponds to a pair of large pressers. Therefore, the end position of the flap cloth sewn on the body cloth and the ball cloth can be individually detected by either one of the two sewing needles. Further, since at least one of the flap sensors is held by the arm member, when the binder is moved from the operating position to the retracted position, at least one of the flap sensors is moved from the attachment position of the sewing machine arm portion together with the arm member. It will be separated. Accordingly, the threading workability is improved.

(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 bead stitch sewing machine 10 according to the present embodiment has a fabric (body cloth) C and a bead fabric (not shown) overlapped and sewn to a predetermined length by two needles 13 and 13, and has two stitches. This is a sewing machine in which a straight cut is formed along the sewing direction and V-shaped cuts are formed at both ends of the cut. Further, when the fabric C and the ball edge fabric are sewn, the flap fabric F (see FIG. 5) is also sewn on the fabric C on one of the two needles 13.
As shown in FIGS. 1 and 2, the bead stitch sewing machine 10 includes a table 11 as a mounting table serving as a sewing work table and a pair of large pressers 41 extending in the conveyance direction of the fabric C. While holding the upper fabric C from above and moving the large presser 41 in the transport direction, the large press feed mechanism 40 as a fabric moving mechanism that transports the fabric C, the ball cloth and the flap fabric F, and the fabric C A flap holding mechanism 55 (see FIG. 3) that holds the flap cloth F to be sewn on each large presser 41 and a ball 12 to be sewn on the cloth C, the binder 12 is applied to both sides of the ball cloth. Bending mechanism 20 (see FIG. 6) for folding back, and a needle up-and-down moving mechanism as a sewing means for performing sewing with two sewing needles 13 on the fabric C and the ball cloth fed along the X-axis direction by the large press feed mechanism 40 And sewing needle 13 A knife mechanism that raises and lowers the moving knife 14 on the downstream side in the cloth feeding direction 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 the table 11 A sewing machine frame 80 that is installed above and stores and holds the needle up-and-down moving mechanism and the knife mechanism, and an arm 83 that forms the upper part of the sewing machine frame 80 and upstream of the two sewing needles 13 in the cloth feed direction A thread guide 17 that is arranged on the side surface and guides the upper thread to the two sewing needles 13; a corner knife mechanism 90 that forms a substantially V-shaped cut at positions that are both ends of the straight cut; and a fabric C And a flap detecting means 30 for irradiating the reflective surface 41c formed on the upper surface of the large presser 41 along the conveying direction and detecting the reflected light. The binder mechanism 20 shown in FIG. 1 is shown with a part of the support mechanism 21 omitted for convenience of explanation.
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 through which the moving knife 14 of the knife mechanism is inserted (see FIG. 2).
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, on the table 11, the large press feed mechanism 40 and the corner knife mechanism 90 are arranged on the downstream side of the sewing machine frame 80 in the cloth feeding direction, and the binder mechanism 20 is arranged on the upstream side of the cloth feeding direction.

The sewing machine frame 80 mainly includes a bed portion (sewing bed portion) 81 installed on the table 11, a vertical trunk portion 82 standing from one end side of the bed portion, and an arm portion extending horizontally from the upper portion thereof. (Sewing machine arm portion) 83.
A sewing machine motor 16 is disposed below the sewing machine frame 80, and a lower shaft that transmits rotational driving force from the sewing machine motor 16 to the shuttle mechanism is supported in the bed portion 81 in a state along the Y-axis direction. Yes. An upper shaft that transmits the vertical movement driving force of the needle vertical movement mechanism from the sewing machine motor 16 is supported in the arm portion 83 in a state along the Y-axis direction. Pulleys are fixedly mounted on the upper shaft and the lower shaft, respectively, and are connected to each other by a timing belt passed through the vertical body portion 82 of the sewing machine frame 80.
Further, a thread that guides the upper thread to the two sewing needles 13 at the lower end of the arm portion 83 and on the upstream side (right side in FIG. 2) upstream of the two sewing needles 13 to be described later. A guide 17 is provided (see FIGS. 7 to 9).
The thread guide 17 is provided with two threading holes that penetrate the thread guide 17 in the substantially Z-axis direction and are arranged side by side along the Y-axis direction. An upper thread is passed through each threading hole so as to be freely inserted, and the upper thread is smoothly guided to one of the two sewing needles 13 corresponding to each threading hole.

(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 Fixed to the upper and lower metal bearings, the needle bar holder that holds the two needle bars at the same time, the upper shaft (main shaft) rotated by the sewing machine motor 16 as the main shaft motor, and one end of the upper shaft And a rotating weight that performs a rotational motion, and a crank rod having one end connected to a position eccentric from the rotation center of the rotating weight and the other end connected to a needle bar holder.

When the upper shaft is rotated by the sewing machine motor 16, the rotating weight is rotated together with the upper shaft, and one end portion of the crank rod performs a circular motion around the upper shaft as the rotating weight rotates. As a result, at the other end of the crank rod, only the moving component along the Z-axis direction of the one end that performs circular motion is transmitted to the needle bar holder, and a reciprocating movement force is applied to each needle bar.
The two sewing needles 13 are arranged side by side along the Y-axis direction. And the binder 12 mentioned later is arrange | positioned between the needle drop positions of the two needles at the time of sewing, and the two needles 13 are sewn on both sides with the binder 12 in between, along the cloth feeding direction. Two parallel seams are formed.

(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, a transmission mechanism that transmits a rotational driving force from the knife motor 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 is driven to rotate 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 cuts corresponding to the knife width in the body cloth and the ball edge cloth to form linear cuts. To do.

(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, two seams are formed in parallel by the cooperation of the two sewing needles 13 and the horizontal hook. That is, the sewing means of this embodiment is constituted by the needle up-and-down moving mechanism and the shuttle mechanism. Further, the sewing machine main body in the present embodiment is configured by the above-described sewing machine frame 80 and the needle up-and-down moving mechanism, the knife mechanism, the shuttle mechanism, and the like built in the sewing machine frame 80.

(Binder mechanism)
As shown in FIGS. 6 and 7, the binder mechanism 20 has an inverted T-shaped cross-section and is set so as to wind a ball cloth and is sent out along the longitudinal direction, and the binder 12 can be moved up and down. And a support mechanism 21 for supporting the above.

  The binder 12 has a long bottom plate portion that is disposed opposite to the upper surface of the table 11 and extends along the cloth feeding direction, and a vertical plate portion that extends vertically on the upper surface of the bottom plate portion and extends along the cloth feeding direction. It has an inverted T-shape when viewed in cross section. The binder 12 is supported by the support mechanism 21 so as to move up and down on the upstream side in the cloth feeding direction from the two sewing needles 13. And the binder 12 arrange | positions a bead cloth on the body cloth placed on the table 11 in the downward position of the up-and-down movement, and press-holds from above.

The support mechanism 21 includes an air cylinder 23 serving as a drive source for the raising / lowering operation of the binder 12, an electromagnetic valve (not shown) that drives the air cylinder 23, and the driving force of the air cylinder 23 is changed to a moving force in the vertical direction. Are provided with a plurality of link bodies 25, arm members 22 that support the plurality of link bodies, and support members 24 that rotatably support the arm members 22.
As shown in FIG. 7, the support member 24 is provided at the tip of an extended portion that extends from a bracket of a holding motor 45 that is a drive source of the large holding feed mechanism 40, and is a shaft portion that extends along the Z-axis direction. The end of the arm member 22 on the downstream side in the cloth feeding direction is supported rotatably.
The arm member 22 is rotated around the support member 24 by the support member 24 at the downstream end in the cloth feed direction, which is the base end, at the position downstream of the two sewing needles 13 in the cloth feed direction. It is supported freely. The distal end of the arm member 22 extends toward the upstream side in the cloth feeding direction through the vicinity of the two sewing needle 13 side ends of the sewing machine body, and is rotated about the support member 24. The binder 12 is separated from the upstream position where the two sewing needles 13 can move up and down (see FIG. 6) and the upstream end of the two sewing needles 13 in the sewing machine body. It is possible to move to the retracted position (see FIG. 7).

At the time of sewing, the air cylinder 23 is driven and the binder 12 is lowered so that the tip of the binder 12 is positioned between the needle drop positions of the two needles 13. In addition, the ball cloth is formed on the binder 12 so as to follow the cross-sectional shape of the binder 12 by cooperating with a pair of large pressers 41 of the large press feed mechanism 40 to be described later lowered to both sides of the binder 12 at the lowered position. In a state of being held so as to be wound, the ball cloth is sent out in the longitudinal direction, and sewing to the fabric C is performed.
Furthermore, one flap sensor 31L among the flap sensors 31L and 31R, which will be described later, is attached to the lower portion of the arm member 22 in the present embodiment via an attachment member 26.

(Large press feed mechanism)
FIG. 3 is a perspective view of the large press feed mechanism 40, and FIG. 4 is a plan view schematically showing the large press feed mechanism 40. As shown in FIG. As shown in these drawings, the large presser feed mechanism 40 is individually arranged on the lower side of each large presser 41 and a pair of large pressers 41 that press the fabric C from above at both sides of the sewing needle 13. At the same time, two laying plates 47 for placing the fabric C when the cloth is fed, a pair of arm members 48 for individually holding the large pressers 41, and the two large pressers 41 can be moved up and down via the arm members 48. The support 42 to be supported, the spacing adjustment mechanism 49 of the large press 41 that makes it possible to adjust the position of each arm member 48 held by the support 42 along the Y-axis direction, and the large press 41 to the support 42. An air cylinder 43 that moves up and down, a solenoid valve (not shown) that controls driving of the air cylinder 43, a presser motor 45 that moves the fabric C pressed by the large presser 41 in the fabric feed direction E, and a presser motor The rotational driving force of 5 and a belt 46 for transmitting to the support 42 is converted into linear motion driving force along the X-axis direction.

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 on the side where the thickness is thin face each other. The two large pressers 41 are respectively supported by the arm member 48 and arranged side by side in the Y-axis direction with the two needles 13 interposed therebetween, and the longitudinal direction thereof extends along the X-axis direction, that is, the cloth feeding direction. Has been.
Then, the large presser feed mechanism 40 lowers each large presser 41 to both sides of the binder 12 in the above-described lowered position, and presses and holds the body cloth and the ball cloth placed on the table 11 from above and each large presser mechanism 40. By moving the presser 41 in the cloth feeding direction, the body cloth and the ball cloth are conveyed.
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 being switched ON / OFF by a solenoid valve (not shown) controlled by an operation control means (not shown) and moves the pressing plates 50 toward each other, thereby the above-described ball cloth. It is possible to fold the two ends of the binder around the binder 12 and maintain the state.

  In addition, a long reflecting surface 41c is formed on the upper surface of each large presser 41 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. 5 is a plan view showing a state in which the flap cloth F is set on the upper surface of the large presser 41. As shown in FIG. 5, when a part of the reflective 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 upstream end position and the downstream end position in the cloth feeding direction are recognized by the operation control means.

  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 41 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 48 swings to raise and lower the large presser 41. It has become.

  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 the large pressers 41 are lowered to hold the cloth C. 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 each arm member 48 by an electromagnetic valve (not shown). 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 of the air cylinder 43 is controlled by the operation control means.
The belt 46 is stretched between a pulley 45a of the pressing motor 45 and a support pulley (not shown). The intermediate portion 46a of the belt 46 is connected to the belt fixing portion 42a of the support 42, and the pressing motor 45. Thus, the two large pressers 41 can be arbitrarily positioned in the X-axis direction.

(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. Then, the flap cloth F sewn on the body cloth and the ball edge cloth is held on the upper surface of the large press 41 while covering the reflection surface 41c of the large press 41 from above over the entire length in the longitudinal direction of the flap fabric F. It is held by the mechanism 55.
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 (30 (L) and 30 (R)) are provided corresponding to the reflection surface 41 c formed on the upper surface of each large presser 41. Each flap detecting means 30 is above the tip of the arm 83 of the sewing machine frame 80, that is, above the movement path of each large presser 41 and upstream of the two needles 13 in the cloth feed direction (right side in FIG. 2) in the Y-axis direction. Arranged side by side.
Each of the flap detection means 30 detects a light source (not shown) as a light projecting member that irradiates the reflection surface 41c of the large presser 41 from above and the reflected light from the reflection surface 41c and shows a detection signal. A flap sensor 31 (31L or 31R) having a detection member that inputs to the operation control means that does not perform, and a support bracket 32 (32L or 32R) that supports the light source and the flap sensor 31 are provided.
Each flap sensor 31 is supported by a support bracket 32 above the reflecting surface 41c of each large presser 41 with the flap sensor 31 facing downward. When the large presser 41 is moved in the cloth feed direction by the above-described large presser feed mechanism 40, light is emitted from the light source toward the reflecting surface 41c, and the reflected light is detected to detect the end of the flap cloth F. The part position, that is, the downstream end position that is the sewing start position and the upstream end position that is the sewing end position are detected.

  Here, in the present embodiment, one flap detection means 30 (R) of the flap detection means 30 is detachably attached to the lower portion of the side surface on the upstream side in the cloth feeding direction at the tip of the arm portion 83 of the sewing machine frame 80 with a screw. It is attached (see FIGS. 1, 8 and 9). That is, the light source of the flap detection means 30 (R) and the flap sensor 31R are stored in a casing that is long along the Y-axis direction, and the side surface of the arm portion 83 via the support bracket 32 together with the casing. Attached to the bottom. The flap detection means 30R is arranged such that the above-described yarn guide 17 is sandwiched between the flap detection means 30 (R) and the arm portion 83 of the sewing machine body, and the right half of the yarn guide 17 is covered from the outside. (See FIG. 9).

On the other hand, among the flap detection means 30, the other flap detection means 30 (L) is attached to the lower part of the arm member 22 that supports the binder 12 so as to be movable up and down via an attachment member 26 (FIG. 8). reference).
One end (upper end) of the attachment member 26 is fixed to the lower end of the substantially central portion in the longitudinal direction along the longitudinal direction of the arm member 22. The mounting member 26 is bent in a substantially L shape while maintaining a vertical surface from one end of the mounting member 26, and extends downward from the upper end toward the horizontal direction perpendicular to the arm member 22. A flap sensor 31L is attached to the lower end portion via a support bracket 32.

The flap sensor 30L is disposed at the tip of the arm portion 83 of the sewing machine body when the arm member 22 is rotated around the support member 24 and the binder 12 is disposed at the operating position, and together with one flap sensor 30R. It is arranged along the Y-axis direction.
In other words, in the present embodiment, the flap sensor 30L is fixedly held by the arm member 22 so that the flap sensor 30L is detachably movable from the attachment position of the arm portion 83 of the sewing machine body. Therefore, when the arm member 22 is rotated around the support member 24 and the binder 12 is moved from the operating position to the retracted position, the flap sensor 30L is moved from the lower portion of the side surface of the arm portion 83 on the upstream side in the cloth feeding direction. The left half of the thread guide 17 is exposed so that it can be operated by the operator of the sewing machine 10.

(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 causing the cloth C conveyed to the working position of the corner knife 91 by the press feed mechanism 40 to penetrate the pair of corner knife 91 from below.
That is, the corner knife mechanism 90 includes an air cylinder 92 that moves the corner knife 91 up and down, an electromagnetic valve (not shown) that drives the air cylinder 92, and a drive motor that moves and positions the corner knife 91 along the X-axis direction. 94.

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, the distance between the pair of corner knives 91 is set in advance by the drive motor 94, and the fabric C and the ball cloth having the seam and the linear cut are formed in the cloth feed direction E by the large press feed mechanism 40. When transported to a predetermined position downstream of the moving knife 14, the pair of corner knife 91 is lifted to form two V-shaped cuts V.

(Description of operation of embodiment)
Next, the operation of the edge stitch sewing machine 10 having the above configuration will be described.
At the time of sewing, in order to hold the ball cloth by the binder 12, the arm member 22 that supports the binder 12 is disposed in the operating position (see FIG. 6), and the binder 12 is disposed in the lowered position. At that time, the arm member 22 that holds the binder 12 is held in a state in which the tip thereof is extended toward the upstream side in the cloth feeding direction. One flap sensor 31L held at the lower end of the arm member 22 is disposed opposite to the yarn guide 17 attached to the upstream surface of the arm portion 83 in the cloth feeding direction, and the other flap sensor 31R. Along with the Y-axis direction orthogonal to the cloth feeding direction E (see FIG. 1). In this state, each of the flap sensors 31L and 31R individually corresponds to the reflecting surfaces 41c and 41c provided on the upper surfaces of the large pressers 41 and 41, and the flap sensors 31L and 31R are flaps on any one of the large pressers 41. When the cloth F is placed and transported, the flap edge can be detected by detecting the reflected light from the reflecting surface 41c by any one of the corresponding flap sensors 31.

  Next, when threading the upper thread supplied to the sewing needle 13 through the sewing needle 13, the arm member 22 is rotated in the horizontal direction around the support member 24 while the sewing machine 10 is stopped. (See FIG. 7) Thereby, the binder 12 supported by the arm member 22 and the one flap sensor 31L attached to the arm member 22 in the horizontal direction are simultaneously separated from the arm portion 83 of the sewing machine 10. It is moved (see FIG. 8). Since the flap sensor 31L is fixed to the arm member 22, the flap sensor 31L is moved in the horizontal direction integrally with the arm member 22. Accordingly, when the arm member 22 is rotated around the support member 24 to move the binder 12 from the operating position shown in FIG. 6 to the retracted position shown in FIG. 7, the flap sensor 31L also moves in the horizontal direction together with the arm member 22. To move to the save position. As a result, the yarn guide 17 attached to the upstream surface of the arm portion 83 in the cloth feeding direction is exposed, and the operator can directly contact the yarn guide 17 (see FIG. 9). That is, when the thread is passed through the thread guide 17 that guides the upper thread (thread) to the sewing needle 13, the flap sensor 31L that blocks the threading work by the operator is removed.

  Conversely, when the arm member 22 is rotated around the support member 24 and the binder 12 is disposed from the retracted position to the operating position, one flap sensor 31L is also moved to the operating position and is provided side by side with the other flap sensor 31R. It will be arranged at the mounting position, that is, the detection position. Note that the rotation of the arm member 22 around the support member 24 can be performed manually by the operator.

(Effect of embodiment)
As described above, according to the ball stitch sewing machine 10 according to the present embodiment, the flap sensor 31L that detects the end of the flap cloth F is provided at the upstream end of the sewing machine body in the cloth feed direction of the two sewing needles 13. On the other hand, it can be moved freely. That is, when the thread is passed through the sewing needle 13, one flap sensor 31L can be separated from the thread guide 17 that guides the thread to the sewing needle 13, so that the flap sensor 31 may hinder the threading operation. Absent. Therefore, the threading workability can be improved.
Further, since the flap sensor 31 is attached to the arm member 22, the binder 12 and the flap sensor 31L can be moved at the same time, and both the binder 12 and the flap sensor 31L can be moved by one rotation. Can be separated from That is, when passing the thread through the sewing needle 13, it is not necessary to move the flap sensor 31L separately from the sewing machine main body separately from the binder 12, and the threading workability can be improved.
Further, since the flap sensor 31L attached to the arm member 22 is rotated and moved together with the arm member 22 in the horizontal direction with respect to the sewing machine main body, the flap sensor 31 is moved toward and away from the sewing machine main body. At this time, it is only necessary to move the arm member 22 in the horizontal direction, and the threading workability can be improved.
Further, since two flap sensors 31 are provided side by side corresponding to each of the pair of large pressers 41, the flap sensor 31 is sewn to the body cloth and the ball cloth by either one of the two sewing needles 13. The end position of the flap cloth F can be detected individually.
In addition, since one of the flap sensors 31 is held by the arm member 22, at least one of the flap sensors 31 together with the arm member 22 of the sewing machine arm portion 83 is moved when the binder 12 is moved from the operating position to the retracted position. It will be separated from the mounting position. Therefore, the threading workability can be improved.

(Other)
In the present embodiment, the flap sensor 31 is separated from the tip of the sewing machine arm portion 83 by rotating the arm member 22 in the horizontal direction around the support member 24. The flap sensor 31L may be moved away from the sewing machine arm portion 83 by rotating in the vertical direction.
In the present embodiment, the flap sensor 31 is attached to the lower part of the arm member 22 that supports the binder 12, so that when the arm member 22 is rotated, the binder 12 and the flap sensor 31 are simultaneously machine arm portions. For example, a support member that supports the flap sensor 31 alone is provided, and the flap sensor 31 is a sewing machine separately from the arm member 22 that supports the binder 12. It is good also as a structure which can be moved apart with respect to the thread | yarn guide 17 of the arm part 83 front-end | tip.
Further, in the present embodiment, one flap sensor 30R is fixed to the arm portion 83 of the sewing machine body, and only the other flap sensor 30L is fixed to the arm member 22. However, these two flap sensors 30L and 30R are fixed to each other. Both of them may be attached to the arm member 22 so as to be detachable from the arm portion 83. That is, at least one of the two flap sensors 30 is held by the arm member 22, and the thread guide 17 is exposed when the binder 12 is moved from the operating position to the retracted position. Any structure that improves the workability of threading the upper thread through the hole may be used.

The perspective view which shows the schematic structure of the whole bead stitch sewing machine which is embodiment of 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 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 perspective view which shows the state by which the binder mechanism of the edge stitch sewing machine has been arrange | positioned in the operation position. It is a perspective view which shows the state in which the binder mechanism of the edge stitch sewing machine was arrange | positioned in the retracted position. It is a principal part perspective view which shows the attachment structure of the flap sensor which is the principal part of this embodiment. It is a principal part perspective view which shows the thread | guide guide periphery at the time of one flap sensor being arrange | positioned in a retracted position with a binder mechanism.

Explanation of symbols

10 Sewing machine 11 Table (work table)
DESCRIPTION OF SYMBOLS 12 Binder 13 Sewing needle 14 Moving knife 15 Needle plate 16 Sewing machine motor 17 Thread guide 20 Binder mechanism 21 Support mechanism 22 Arm member 23 Air cylinder 24 Support member 25 Link body 26 Mounting member 30 Flap detection means 31 Flap sensor (detection member)
40 Large presser feed mechanism (cloth movement mechanism)
41 Large presser 41c Reflective surface 45 Presser motor 55 Flap holding mechanism 80 Sewing machine frame 81 Bed (sewing machine bed)
82 Vertical trunk 83 Arm (sewing machine arm)
C Cloth E Cloth feed direction F Flap cloth

Claims (5)

A sewing machine main body having two sewing needles that are moved up and down by a spindle motor, and forming two parallel seams by moving the two sewing needles up and down;
A thread guide that is disposed at the tip of the sewing machine arm portion and on the upstream side of the two sewing needles in the cloth feeding direction, and guides the thread to the two sewing needles;
It has a long bottom plate portion along the cloth feeding direction and a standing plate portion erected from the bottom plate portion, and is supported so as to be movable up and down on the upstream side in the cloth feeding direction of the two sewing needles. A binder that arranges a ball edge cloth on the body fabric,
A pair of large pressers extending in the cloth feeding direction is lowered to both sides of the binder in the lowered position to press and hold the body cloth and the ball cloth placed on the sewing machine table from above and the large presser A cloth moving mechanism for conveying the body cloth and the ball cloth by moving the cloth in the cloth feeding direction;
A flap holding mechanism for holding a flap cloth to be sewn on the body cloth and the ball edge cloth on the upper surface of the large presser;
Arranged upstream of the two sewing needles in the cloth feeding direction, when the large presser is moved in the cloth feeding direction by the cloth moving mechanism, toward the reflection surface formed on the upper surface of the large presser A flap sensor that irradiates light from above and detects the end position of the flap cloth by detecting the reflected light; and
A bead for deciding a sewing start position or a sewing end position by the sewing machine body based on an end position of the flap cloth detected by the flap sensor and sewing the flap cloth on the body cloth and the bead cloth. In the sewing machine
An edge stitch sewing machine, comprising: an arm member that holds the flap sensor so as to be movable away from the attachment position of the sewing machine arm portion.   The arm member is supported so that its base end portion is rotatable at a position downstream of the two sewing needles in the cloth feeding direction, and in the vicinity of the two sewing needle side end portions in the sewing machine body. It extends toward the upstream side in the cloth feeding direction, and supports the flap sensor together with the binder and is rotated around a support member, so that the binder is separated from the cloth of the two sewing needles. 2. An operation position capable of moving up and down on the upstream side in the feed direction and a retracted position separated from an upstream side end portion in the cloth feed direction of the two sewing needles in the sewing machine main body. The rim stitch sewing machine described.   The edge stitch sewing machine according to claim 2, wherein the arm member horizontally moves the binder from the operating position to the retracted position.   The edge stitch sewing machine according to claim 2, wherein the arm member moves the binder from the operating position to the retracted position in a vertical direction.   5. The flap sensor according to claim 1, wherein two flap sensors are provided side by side corresponding to each of the large pressers, and at least one of the flap sensors is held by the arm member. The rim stitch sewing machine described.

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