Belt ring supply device and belt ring sewing device

Abstract

The invention provides a belt ring supply device, which enables the insertion of a belt material into a gap of a fork to be easy, and enables the two end parts of the belt material to be folded back at a proper size. The belt ring supply device comprises a ring bending part and a moving mechanism, and the ring bending part comprises a pair of fork parts which respectively insert two end parts of a thin belt-shaped belt material into a fork gap; and a rotation driving part which rotates the pair of fork parts and bends the two end parts, the ring bending part forms a hem by bending the two end parts of the strip, the moving mechanism enables the ring bending part to move to a bending position and a sewing position, and each of the pair of fork parts comprises a first shaft part and a second shaft part which form a fork gap and an opening and closing mechanism. The opening and closing mechanism relatively moves the first shaft portion and the second shaft portion to an open position where the size of the fork gap is a first interval and a closed position where the size of the fork gap is a second interval smaller than the first interval.

Description

Technical Field

[0001] The present invention relates to a belt loop supplying device and a belt loop sewing device. Background Art

[0002] Patent document 1 discloses a belt loop sewing device, which includes a belt loop supply device and a sewing machine. The belt loop sewing device is a device that sews the two ends of a thin belt-shaped belt material to a sewing object such as clothing to form a belt loop for the belt to pass through. The belt loop supply device bends the two end portions of the belt material to be the belt loop toward the center side and supplies it to the sewing position. The sewing machine sews the bent two end portions to the sewing object respectively.

[0003] The belt loop supply device comprises: a front bending shaft for bending the base end side of the belt loop, and a rear bending shaft for bending the tip end side of the belt loop, and a fork is provided at the tip end of each shaft, and the fork is provided with two pins in a manner of being appropriately spaced and parallel to each other. By inserting the belt material into the gap between each fork and rotating each shaft, the two end portions of the belt material are bent.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-197784 Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] The thickness of the fabric of the tape varies. Therefore, the size of the gap between each fork is adjusted according to the thickness of the tape. If the gap between the forks is large, it is easy to insert the tape into the gap, but the size of the folded-back portion will be unnecessarily long. If the gap between the forks is small, the size of the folded-back portion can be shortened, but when the tape is bent, the insertion into the gap between the forks may fail. It is desired to facilitate the insertion of the tape into the gap between the forks and to fold back the two ends of the tape at an appropriate size.

[0009] The present disclosure has been made in view of the above situation, and an object thereof is to provide a tape loop supplying device and a tape loop sewing device that can facilitate insertion of a tape into a gap between forks and fold back both ends of the tape in appropriate dimensions.

[0010] (II) Technical solution

[0011] According to a first aspect of the present invention, a belt ring supply device is provided, which comprises: a ring bending portion, and a moving mechanism, the ring bending portion includes: a pair of fork portions, which respectively insert the two end portions of a thin belt-shaped belt into a fork gap; and a rotation drive portion, which rotates the pair of fork portions respectively to bend the two end portions, the ring bending portion forms a seam edge by bending the two end portions of the belt, the moving mechanism moves the ring bending portion to a bending position and a sewing position, the pair of fork portions each have: a first shaft portion and a second shaft portion forming the fork gap, and an opening and closing mechanism, the opening and closing mechanism causes the first shaft portion and the second shaft portion to move relative to each other to the following positions, namely: an open position where the size of the fork gap is a first interval, and a closed position where the size of the fork gap is a second interval smaller than the first interval.

[0012] According to a second aspect of the present invention, a belt loop sewing device is provided, which comprises: a belt loop supply device, which bends the two end portions of a thin belt-shaped belt material to form a seam edge and transports it to a sewing position; and a sewing machine, which sews the two end portions of the belt material transported to the sewing position onto a sewing object, the belt loop supply device having: a ring bending portion, and a moving mechanism, the ring bending portion including: a pair of forks, which respectively insert the two end portions of the belt material into a fork gap; and a rotation drive portion, which rotates the pair of forks respectively to bend the two end portions, the moving mechanism moves the ring bending portion to a bending position and a sewing position, the pair of forks each having: a first shaft portion and a second shaft portion forming the fork gap, and an opening and closing mechanism, the opening and closing mechanism causing the first shaft portion and the second shaft portion to move relative to each other to the following positions, namely: an open position in which the size of the fork gap is a first interval, and a closed position in which the size of the fork gap is a second interval smaller than the first interval.

[0013] (III) Beneficial effects

[0014] According to the present disclosure, the strip can be easily inserted into the gap between the forks, and both ends of the strip can be folded back to an appropriate size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view schematically showing the overall structure of the belt loop sewing device according to the embodiment.

[0016] Figure 2 It is a plan view schematically showing the overall structure of the belt loop sewing device according to the embodiment.

[0017] Figure 3 It is a schematic perspective view showing a cutting device, a pulling device, and a supporting device according to the embodiment.

[0018] Figure 4It is a plan view showing each conveyance position of the strip in the embodiment.

[0019] Figure 5 It is a perspective view showing the tape ring supply device according to the embodiment.

[0020] Figure 6 It is an enlarged perspective view showing a fork portion according to the embodiment.

[0021] Figure 7 It is an explanatory diagram showing the structure of the first shaft portion and the second shaft portion according to the embodiment.

[0022] Figure 8 This is a diagram for explaining the opening and closing of the fork portion by the opening and closing mechanism according to the embodiment.

[0023] Fig. 9 It is a perspective view showing an adjustment portion provided on a fork portion according to the embodiment.

[0024] Fig.10 It is an explanatory diagram showing a state in which the fixing screws of the adjustment portion according to the embodiment are removed.

[0025] Fig.11 (A) and (B) are explanatory diagrams for explaining adjustment of the closed position by the stopper according to the embodiment.

[0026] Fig.12 This is an explanatory diagram for explaining the bending of both end portions of a strip material by a pair of forks.

[0027] Fig.13 It is a perspective view of a pair of forks showing a state in which both end portions of a strip are bent.

[0028] Fig.14 This is a perspective view for explaining the shape of a strip material in a state where both end portions are bent.

[0029] Fig.15 It is an enlarged perspective view showing the vicinity of the sewing position of the sewing machine according to the embodiment.

[0030] Fig.16 It is a perspective view of the presser foot according to the embodiment as viewed from below.

[0031] Fig.17 It is an explanatory diagram for explaining the positional relationship between the guide portion of the presser foot and the fork portion according to the embodiment.

[0032] Fig.18 This is an explanatory diagram of the positional relationship during sewing in which the end portion of the +X side of the tape is pressed by the presser foot according to the embodiment, as viewed along the Y-axis direction.

[0033] Fig.19This is an explanatory diagram of the positional relationship during sewing in which the end portion of the +X side of the tape is pressed by the presser foot according to the embodiment, as viewed along the X-axis direction.

[0034] Description of Reference Numerals

[0035] 1-belt loop sewing device; 2-feeding device; 3-cutting device; 4-pulling device; 5-supporting device; 6-belt loop supplying device; 6H-housing; 7-sewing machine; 8-control device; 31-cutting drive unit; 32-movable knife; 33-belt support platform; 34-driving shaft; 41-holding part; 41A-upper handle; 41B-lower handle; 41C-bottom plate; 41D-opening and closing drive unit; 42-holding moving part; 42A-movable shaft; 43-pulling motor; 44-support frame; 51-support plate; 52-support plate drive unit; 53 - movable plate; 54- loose forming plate; 61- ring bending part; 62- a pair of forks; 62A, 62B- forks; 63, 63A, 63B- rotating driving part; 65- moving mechanism; 66- fork holder; 67- guide rod; 68- driving force transmission part; 68A, 68B- pulley; 68C- belt; 68D- intermediate gear; 69- moving motor; 69A- driving gear; 71- sewing machine head; 72- needle holding part; 73- needle plate; 74, 74A, 74B- presser foot; 75- holding part; 76- feeding mechanism; 76A -feeding part; 77-sewing machine needle; 78-pressing driving part; 79-spindle motor; 101-first shaft; 102-second shaft; 103-opening and closing mechanism; 103A-rotating shaft; 103B-driving cylinder; 103C-rod; 103D-cylinder body; 104A, 104B-supporting shaft; 105-holding plate; 111A; 111B-pin part; 112A; 112B-pin holding part; 112K-cut part; 113-protruding piece; 114-connecting part; 120-adjusting part; 121-stopper; 121 A-long hole; 121B-end; 122-guide groove; 123-threaded hole; 150-first leg member; 151-pressing plate; 152-guide portion; 160-second leg member; 161-pressing plate; 162-protruding wall; CL-fork gap; CL1-first interval; CL2, CL2A, CL2B-second interval; FB-folding part; P1-sewing position; P2-bending position; P3-standby position; Q1-cutting position; Q2-grasping position; Q3-loop forming position; SF1, SF2-surface; TP-tape. DETAILED DESCRIPTION

[0036] Hereinafter, the embodiments of the present disclosure will be described based on the drawings. In addition, the present invention is not limited to the embodiments. In addition, the constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

[0037] The belt loop supply device 6 and the belt loop sewing device 1 of the present embodiment are described. In the present embodiment, the positional relationship of each part is described based on the local coordinate system specified in the belt loop sewing device 1. The local coordinate system is specified by the XYZ orthogonal coordinate system. The direction parallel to the X-axis in the specified plane is set as the X-axis direction. The direction parallel to the Y-axis in the specified plane orthogonal to the X-axis is set as the Y-axis direction. The direction parallel to the Z-axis orthogonal to the specified plane is set as the Z-axis direction. The rotation direction centered on the X-axis is set as the θX direction, the rotation direction centered on the Y-axis is set as the θY direction, and the rotation direction centered on the Z-axis is set as the θZ direction.

[0038] (Overall structure of the belt loop sewing device)

[0039] Figure 1 It is a perspective view schematically showing the entire structure of the belt loop sewing device 1 according to the embodiment. Figure 2 1 is a top view schematically showing the overall structure of the belt loop sewing device 1 according to the embodiment. Figure 1 and Figure 2 As shown, the belt loop sewing device 1 includes: a feeding device 2, a cutting device 3, a pulling device 4, a supporting device 5, a belt loop supply device 6, and a sewing machine 7. The belt loop sewing device 1 is equipped with a control device 8, and the control device 8 controls the feeding device 2, the cutting device 3, the pulling device 4, the supporting device 5, the belt loop supply device 6, and the sewing machine 7.

[0040] The sewing machine 7 and the belt loop supply device 6 are opposite to each other in the Y-axis direction. The sewing machine 7 is arranged in the +Y direction, and the belt loop supply device 6 is arranged in the -Y direction. The feeding device 2, the cutting device 3, the pulling device 4, and the supporting device 5 are arranged between the sewing machine 7 and the belt loop supply device 6 in the Y-axis direction. The feeding device 2, the cutting device 3, the pulling device 4, and the supporting device 5 are arranged in the X-axis direction. From the -X direction toward the +X direction, the feeding device 2, the cutting device 3, the supporting device 5, and the pulling device 4 are arranged in sequence. The feeding device 2 and the pulling device 4 are opposite to each other in the X-axis direction. The cutting device 3 and the supporting device 5 are arranged at a position between the feeding device 2 and the pulling device 4 in the X-axis direction.

[0041] Figure 3 It is a schematic perspective view showing the cutting device 3, the pulling device 4, and the supporting device 5 according to the embodiment. Figure 4 It is a plan view showing each conveyance position of the tape material TP in the embodiment.

[0042] like Figure 1 , Figure 2 and Figure 3As shown, the delivery device 2 delivers a thin strip of tape TP as a material of the tape loop. The delivery device 2 includes: a tape delivery platform formed with a tape passage, a pair of delivery rollers clamping the front and back sides of the tape TP, and a motor for rotating the delivery rollers. The delivery device 2 rotates at least one of the delivery rollers by the motor in a state where the tape TP is clamped between the pair of delivery rollers, thereby delivering the tape TP from the tape passage of the tape delivery platform. The delivery device 2 delivers the tape TP toward the pull-out device 4 in the +X direction.

[0043] The cutting device 3 is arranged at a position close to the feeding device 2 in the +X direction. The cutting device 3 cuts the strip TP fed from the feeding device 2. The cutting device 3 is driven by a cutting drive unit 31 (see Figure 1 ), a movable knife 32, a belt support platform 33, etc. Figure 3 As shown, the belt support platform 33 is located in the +X direction from the belt path of the feeding device 2, and supports the belt material TP fed from the belt path from below. A movable knife 32 is arranged at a position directly above the belt support platform 33 in the +Z direction. A fixed knife is provided on the belt support platform 33 to be opposite to the movable knife 32 in the Z-axis direction. The cutting drive unit 31 is arranged in the +Z direction of the belt support platform 33. The cutting drive unit 31 drives the movable knife 32 in the up and down direction via the driving shaft 34. The cutting drive unit 31 drives the movable knife 32 in the -Z direction, thereby cutting the belt material TP between the fixed knife and the movable knife 32. The cutting drive unit 31 drives the movable knife 32 in the +Z direction, thereby causing the movable knife 32 to retreat upward from the belt path on the belt support platform 33 in preparation for the next cutting.

[0044] The pulling device 4 holds and pulls out the end of the strip TP sent out by the sending device 2 in the +X direction. The pulling device 4 includes: a holding portion 41 having a pair of handles, and a holding moving portion 42 that moves the holding portion 41 in the X-axis direction. The pair of handles of the holding portion 41 is composed of an upper handle 41A and a lower handle 41B that can be opened and closed in the Z-axis direction. The lower handle 41B is integrally formed with the bottom plate 41C and fixed to the bottom plate 41C. The upper handle 41A is set to be able to rotate up and down relative to the bottom plate 41C. An opening and closing driving portion 41D that drives the upper handle 41A to rotate is provided on the bottom plate 41C. The opening and closing driving portion 41D is, for example, a cylinder, and the upper handle 41A is swung by advancing and retreating the rod connected to the upper handle 41A. The opening and closing driving portion 41D sandwiches and holds the strip TP between the upper handle 41A and the lower handle 41B by bringing the upper handle 41A close to the lower handle 41B. The opening and closing driving unit 41D releases the grip on the strip TP by separating the upper handle 41A from the lower handle 41B. Figure 2As shown, the gripping moving part 42 uses the pull-out motor 43 to reciprocate the movable shaft 42A connected to the gripping part 41 in the X-axis direction. The movable shaft 42A is a rod-shaped member extending in the X-axis direction, and supports the gripping part 41 at the end in the -X direction. The movable shaft 42A is supported by the support frame 44 so as to be movable only in the X direction. Figure 4 As shown, the pull-out device 4 can drive the gripper 41 in the X-axis direction within a range including a gripping position Q2 close to the cutting device 3 and a belt loop forming position Q3 closer to the gripping position Q2 in the +X direction by moving the movable shaft 42A.

[0045] Under the control of the control device 8, the pulling device 4 holds the end of the strip TP sent to the gripping position Q2 by the holding portion 41, and moves the holding portion 41 in the +X direction to the pulling length position in the holding state. Thus, the pulling device 4 pulls the strip TP out to a pulling length corresponding to the size of the belt loop. When the strip TP is pulled out to the pulling length position, the cutting device 3 drives the movable knife 32 to cut the strip TP. The strip TP is formed into the following length (pulling length), which is equivalent to the distance between the pulling length position and the cutting position Q1. The pulling length position is a position corresponding to the set value in the control device 8, and can be the same position as the belt loop forming position Q3, or a different position.

[0046] The support device 5 supports the strip TP pulled out by the pulling device 4 from below. When the two end portions of the strip TP are bent by the strip ring supply device 6, the support device 5 supports and holds the strip TP. Figure 3 As shown, the support device 5 includes: a pair of support plates 51, and a support plate driving unit 52 (see Figure 1 ). A pair of support plates 51 are arranged at intervals along the X-axis direction between the loop forming position Q3 and the cutting position Q1. Each support plate 51 is formed into an L-shape (when viewed from the +X direction to the -X direction) that extends downward (in the -Z direction) from the top of the position where the strip TP is configured and then bends in the +Y direction. The upper surface of the portion of each support plate 51 that bends in the +Y direction is a support surface for supporting the strip TP. A pair of support plates 51 are mounted on a movable plate 53 that extends up and down. The support plate driving unit 52 is, for example, an air cylinder, which moves the pair of support plates 51 and the movable plate 53 up and down as a whole by advancing and retreating the rod connected to the movable plate 53. When the support device 5 pulls out the strip TP through the pulling device 4, the support device 5 causes the pair of support plates 51 to retreat downward from the gripping portion 41 and the passage path of the strip TP through the support plate driving unit 52. When the strip TP is pulled out to a position beyond the pair of support plates 51 by the pull-out device 4 , the support device 5 moves the pair of support plates 51 upward by the support plate driving unit 52 to support the strip TP.

[0047] The support device 5 is provided with a loose (Japanese: フルネス) forming plate 54. The loose forming plate 54 is arranged between a pair of support plates 51 in the X-axis direction. The loose forming plate 54 is formed in an L-shape (when viewed from the +X direction to the -X direction) that extends downward from the top relative to the position where the strip TP is arranged, similarly to each support plate 51. The upper surface of the portion of the loose forming plate 54 that is bent in the +Y direction is a contact surface that contacts the strip TP. The loose forming plate 54 can be moved up and down by an independent driving unit different from the support plate driving unit 52 of the pair of support plates 51. The loose forming plate 54 is a component for raising the approximately central portion of the strip TP (belt loop) in the longitudinal direction in a mountain shape to form a loose shape (loose) in the central portion in the longitudinal direction. When the loose formation is set, the control device 8 controls the support device 5 to arrange the loose forming plate 54 at a position above the pair of support plates 51. As a result, the central portion of the strip TP is raised in a mountain shape. When the loose formation is not set, the control device 8 controls the support device 5 to arrange the loose formation plate 54 at the same height position as the pair of support plates 51. Thus, the strip TP is supported in a straight line. In addition, the support device 5 presses the strip TP supported by the pair of support plates 51 from above through the abutment plate, and clamps the strip TP through the pair of support plates 51 and the abutment plate, thereby being able to hold the strip TP.

[0048] like Figure 1 , Figure 2 and Figure 4 As shown, the belt loop supply device 6 bends the two end portions of the thin belt-shaped tape TP to form a seam edge and transports it to the sewing position P1. The belt loop supply device 6 bends the two end portions of the tape TP that has been pulled out to the belt loop forming position Q3 and supported by the support device 5. The belt loop supply device 6 bends the two end portions of the tape TP to form a shape when it is sewn to the sewing object as a belt loop. The belt loop supply device 6 keeps the bent tape TP and moves it from the bending position P2 to the sewing position P1 where it is sewn by the sewing machine 7, that is, moves it in the +Y direction.

[0049] The sewing machine 7 sews the two end portions of the tape TP conveyed to the sewing position P1 to the sewing object. The sewing object is, for example, fabric of clothes (pants, etc.). In the embodiment, the sewing machine 7 is a two-needle electronic cycle sewing machine. The sewing machine 7 can sew the two end portions of the tape TP at the same time (seam edge) using two sewing machine needles 77. Figure 1 , Figure 2 and Figure 4 As shown, the sewing machine 7 has a sewing machine head 71, a needle holding portion 72, a needle plate 73, a presser foot 74, a feed mechanism 76 and a spindle motor 79. The sewing machine 7 has a known structure such as a thread take-up lever, a thread regulator, a kettle, and a sewing machine control unit, and a detailed description thereof is omitted.

[0050] The control device 8 includes a computer system. The control device 8 includes a processor such as a CPU (Central Processing Unit), a main memory including a non-volatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM (Random Access Memory), a storage device, and an interface including an input and output circuit. The control device 8 is connected to the feeding device 2, the cutting device 3, the pulling device 4, the supporting device 5, the belt loop supply device 6, and the sewing machine 7 via the interface. The control device 8 monitors the states of the feeding device 2, the cutting device 3, the pulling device 4, the supporting device 5, the belt loop supply device 6, and the sewing machine 7 by sending and receiving signals, and controls the actions of the feeding device 2, the cutting device 3, the pulling device 4, the supporting device 5, the belt loop supply device 6, and the sewing machine 7.

[0051] (Structure of belt loop supply device)

[0052] Figure 5 1 is a perspective view showing a belt loop supply device 6 according to an embodiment. The belt loop supply device 6 includes a ring bending portion 61 and a moving mechanism 65. The ring bending portion 61 is a mechanism for forming a seam edge by bending both end portions of the belt material TP. The moving mechanism 65 moves the ring bending portion 61 to a bending position P2 and a sewing position P1.

[0053] The ring bending portion 61 includes: a pair of fork portions 62, and a rotation drive portion 63. The pair of fork portions 62 are arranged at intervals in the X-axis direction. That is, the pair of fork portions 62 is composed of a fork portion 62A on the +X direction side and a fork portion 62B on the -X direction side. The fork portion 62A and the fork portion 62B have substantially the same structure. The fork portion 62A and the fork portion 62B have a two-pronged fork shape composed of two shaft portions described later, and a fork gap CL is provided between the shaft portions. The pair of fork portions 62 respectively insert the two end portions of the thin strip-shaped strip TP into the fork gap CL. The pair of fork portions 62 respectively hold the two end portions of the strip TP. The fork portion 62A holds the strip TP near the end portion in the +X direction, and the fork portion 62B holds the strip TP near the end portion in the -X direction. The interval in the X-axis direction of the pair of forks 62 corresponds to the folded back portion FB of the strip TP (refer to Fig.14 ) is set according to the size of the belt loop.

[0054] Each of the pair of fork portions 62 includes a first shaft portion 101 and a second shaft portion 102 that form a fork gap CL, and an opening and closing mechanism 103. The first shaft portion 101 and the second shaft portion 102 are adjacent to each other and arranged in a manner generally facing the +Y direction. The first shaft portion 101 and the second shaft portion 102 can move relative to each other in a manner of approaching and separating from each other. The opening and closing mechanism 103 changes the size of the fork gap CL by relatively moving the first shaft portion 101 and the second shaft portion 102.

[0055] The rotation drive unit 63 rotates the pair of forks 62 respectively to bend the two end portions. Specifically, the rotation drive unit 63 includes: a rotation drive unit 63A that rotates the fork 62A, and a rotation drive unit 63B that rotates the fork 62B. The rotation drive unit 63A and the rotation drive unit 63B have substantially the same structure. The rotation drive unit 63A is arranged in the -Y direction relative to the fork 62A, and is connected to the fork 62A via the support shaft 104A. The rotation drive unit 63A rotates the fork 62A fixed at the end of the support shaft 104A by rotating the support shaft 104A around the central axis. The fork 62A is rotated in a torsion manner around the central axis of the support shaft 104A by the rotation drive unit 63A. The rotation drive unit 63B is arranged in the -Y direction relative to the fork 62B, and is connected to the fork 62B via the support shaft 104B. The rotation drive unit 63B rotates the fork 62B fixed to the end of the support shaft 104B by rotating the support shaft 104B around the central axis. The fork 62B is rotated in a twisting manner around the central axis of the support shaft 104B by the rotation drive unit 63B. The rotation drive unit 63A and the rotation drive unit 63B are composed of, for example, a rotary cylinder capable of rotational drive.

[0056] The moving mechanism 65 holds a pair of fork portions 62 (fork portion 62A, fork portion 62B) and a rotation drive portion 63 (rotation drive portion 63A, rotation drive portion 63B) so as to be movable in the Y-axis direction. The moving mechanism 65 includes: a fork holder 66, a guide rod 67, a driving force transmission portion 68, and a moving motor 69. The fork holder 66 is arranged above the pair of fork portions 62 and the rotation drive portion 63, and holds the pair of fork portions 62 and the rotation drive portion 63 in a manner suspended from above. The fork holder 66 is slidably mounted on the guide rod 67. The guide rod 67 extends in the Y-axis direction. Both ends of the guide rod 67 are mounted on the housing 6H of the belt ring supply device 6. The guide rod 67 supports the pair of fork portions 62 and the rotation drive portion 63 via the fork holder 66 so as to be movable in the Y-axis direction. The pair of fork portions 62 can reciprocate in the Y-axis direction within the following prescribed range, and the range includes: as Figure 4 The standby position P3, the bending position P2 and the sewing position P1 are shown. The standby position P3 is a position away from the bending position P2 in the -Y direction and is a position retreated from the working area when the above-mentioned pulling device 4 and supporting device 5 are operated.

[0057] The driving force transmission part 68 connects the moving motor 69 and the fork holder 66 in a manner capable of transmitting power. In the embodiment, the driving force transmission part 68 is a mechanism including a belt and a pulley, and has: a pulley 68A, a pulley 68B, a belt 68C and an intermediate gear 68D. The pulley 68A and the pulley 68B are arranged at intervals along the Y-axis direction, and are respectively arranged near the two ends of the guide rod 67. The belt 68C is an endless belt (annular belt) spanned between the pulley 68A and the pulley 68B, and is connected to the fork holder 66 at a predetermined position of the belt 68C. An intermediate gear 68D is provided on the rotating shaft of the pulley 68A. The intermediate gear 68D meshes with the driving gear 69A installed on the output shaft of the moving motor 69, and rotates integrally with the pulley 68A. The moving motor 69 generates a driving force for reciprocating the pair of forks 62 along the Y-axis direction. The moving motor 69 drives the driving gear 69A to rotate, thereby rotating the pulley 68A via the intermediate gear 68D. As the pulley 68A rotates, the belt 68C circulates between the pulley 68A and the pulley 68B. The circulatory rotation of the belt 68C causes the fork holder 66 holding the pair of fork portions 62 to move integrally with the pair of fork portions 62 in the Y-axis direction. According to the control of the control device 8, the moving motor 69 moves the pair of fork portions 62 to the standby position P3, the bending position P2, and the sewing position P1.

[0058] Figure 6 It is an enlarged perspective view showing a fork portion 62A according to the embodiment. Figure 7 101 and 102 are explanatory diagrams showing the structure of the first shaft portion 101 and the second shaft portion 102 of the embodiment. Figure 6 and Figure 7 The structure of the fork portion 62A will be described. The structure of the fork portion 62B is substantially the same as that of the fork portion 62A, so the description thereof will be omitted. The first shaft portion 101 and the second shaft portion 102 are respectively mounted on a pair of retaining plates 105. The pair of retaining plates 105 are plate members extending in a straight line, retaining the first shaft portion 101 and the second shaft portion 102 at one end, and being fixed to the support shaft 104A at the other end.

[0059] The first shaft portion 101 and the second shaft portion 102 each have a pin member and a pin holding portion. That is, the first shaft portion 101 has a pin member 111A and a pin holding portion 112A that holds the pin member 111A, and the second shaft portion 102 has a pin member 111B and a pin holding portion 112B that holds the pin member 111B. The pin members 111A and 111B are rod-shaped members disposed at the end of the fork portion 62A and are in contact with the strip TP. Between the pin member 111A of the first shaft portion 101 and the pin member 111B of the second shaft portion 102 is a fork gap CL into which the strip TP is inserted. The pin holding portions (112A and 112B) hold the pin members (111A and 111B) in such a manner that the pin members protrude from the end of the pin holding portions.

[0060] like Figure 7 As shown, the pin holding portion 112B of the second shaft portion 102 is fixed to a pair of retaining plates 105. The pin holding portion 112A of the first shaft portion 101 is rotatably mounted on the pin holding portion 112B. The pin holding portion 112A has a protruding piece 113 protruding toward the second shaft portion 102 at the base end portion on the side opposite to the terminal portion on which the pin member 111A is mounted. A portion of the protruding piece 113 is mounted on the pin holding portion 112B via the rotating shaft 103A, and the pin holding portion 112A is rotatable around the rotating shaft 103A. In addition, a connecting portion 114 connected to the opening and closing mechanism 103 is provided at the base end portion of the pin holding portion 112A. The connecting portion 114 is arranged at a position away from the rotating shaft 103A. The connecting portion 114 is connected to the driving cylinder 103B of the opening and closing mechanism 103. The drive cylinder 103B is, for example, a direct-acting air cylinder, and moves the connecting portion 114 by moving the rod portion 103C forward and backward. Figure 6 ) includes: a cylinder body 103D installed between a pair of retaining plates 105, and a rod portion 103C that moves forward and backward relative to the cylinder body 103D.

[0061] Thus, the opening and closing mechanism 103 includes: a rotation shaft 103A that rotatably supports the first shaft portion 101, and a drive cylinder 103B that rotates the first shaft portion 101 around the rotation shaft 103A. Figure 7 In the embodiment, the driving cylinder 103B causes the rod 103C to move forward, thereby causing the first shaft 101 to rotate counterclockwise around the rotation axis 103A. As a result, the first shaft 101 approaches the second shaft 102. The driving cylinder 103B causes the rod 103C to move backward, thereby causing the first shaft 101 to rotate clockwise around the rotation axis 103A. As a result, the first shaft 101 moves away from the second shaft 102.

[0062] Figure 8 1 is a diagram for explaining the opening and closing of the fork portion 62 by the opening and closing mechanism 103 according to the embodiment. Figure 8 As shown, the opening and closing mechanism 103 makes the first shaft portion 101 and the second shaft portion 102 relatively move to the following positions, that is, an open position where the size of the fork gap CL is a first interval CL1, and a closed position where the size of the fork gap CL is a second interval CL2 smaller than the first interval CL1. In addition, although in the embodiment, the first shaft portion 101 is moved (rotated), the second shaft portion 102 may be moved relative to the fixed first shaft portion 101, or both the first shaft portion 101 and the second shaft portion 102 may be moved.

[0063] In addition, the opening and closing mechanism 103 is controlled by the control device 8. When the strip TP is inserted into the fork gap CL, the control device 8 controls the opening and closing mechanism 103 to move the first shaft portion 101 to the open position. As a result, the fork gap CL is expanded to the first interval CL1, thereby increasing the allowable range of positional deviation of the end portion caused by bending of the strip TP, etc., and the strip TP can be more reliably inserted into the fork gap CL. After the strip TP is inserted into the fork gap CL and before the two end portions of the strip TP are bent, the control device 8 controls the opening and closing mechanism 103 to move the first shaft portion 101 to the closed position. As a result, the fork gap CL is reduced to the second interval CL2, thereby reducing the diameter of the rotation trajectory of the pin component 111A and the pin component 111B that hold the strip TP. Since the radius of curvature of the folded portion FB of the strip TP is reduced, the size of the folded portion FB can be reduced (refer to Fig.14 ).

[0064] Fig. 9 It is a perspective view showing the adjustment portion 120 provided in the fork portion 62A according to the embodiment. Fig.10 1 is an explanatory diagram showing a state where the fixing screw 124 of the adjustment part 120 of the embodiment is removed. In the embodiment, each of the pair of fork parts 62 has an adjustment part 120 for adjusting the size of the second interval CL2. The adjustment part 120 performs positioning of the rotation range of the first shaft part 101, and in particular, performs positioning of the position closest to the second shaft part 102, that is, the closed position.

[0065] like Fig. 9 and Fig.10As shown, the adjustment portion 120 has a stopper 121 capable of position adjustment. The stopper 121 determines the size of the second interval CL2 (i.e., the closed position of the first shaft portion 101) by abutting against the first shaft portion 101 or the second shaft portion 102 in the closed position. In the embodiment, the stopper 121 is mounted on the first shaft portion 101 and abuts against the second shaft portion 102. Specifically, a guide groove 122 for guiding the stopper 121 is formed in the pin holding portion 112A of the first shaft portion 101. The stopper 121 is a plate-shaped member slidably fitted into the guide groove 122. The guide groove 122 is formed on the side of the pin holding portion 112A. The guide groove 122 extends in a direction approaching and moving away from the pin holding portion 112B of the second shaft portion 102. The stopper 121 can move along the guide groove 122 in a direction approaching and moving away from the second shaft portion 102. A threaded hole 123 is formed at the bottom of the guide groove 122. The stopper 121 is formed with a long hole 121A along the extending direction of the guide groove 122. The stopper 121 is fastened and fixed to the pin holding portion 112A by a fixing screw 124 that passes through the long hole 121A and is installed in the threaded hole 123. The stopper 121 can be positionally adjusted along the guide groove 122 within the range of the gap between the long hole 121A and the fixing screw 124 by loosening the fixing screw 124. Thus, the stopper 121 can be positionally adjusted between the position where the end 121B on the second shaft portion 102 side protrudes from the pin holding portion 112A and the position where the end 121B is away from the surface SF1 of the pin holding portion 112A.

[0066] Fig.11 This is an explanatory diagram for explaining adjustment of the closed position by the stopper 121 according to the embodiment. Fig.11 (A) shows a state where the end 121B of the stopper 121 is arranged at a position away from the surface SF1 of the pin holding portion 112A. Fig.11 In (A), in the closed position, the surface SF1 of the pin holding portion 112A and the surface SF2 of the pin holding portion 112B are in contact with each other, thereby determining the position of the first shaft portion 101. As a result, the size of the fork gap CL is the second interval CL2A. Fig.11 (B) shows a state where the end 121B of the stopper 121 is made to protrude from the pin holding portion 112A. Fig.11In (B), the end 121B of the stopper 121 is closer to the surface SF2 of the pin holding portion 112B than the surface SF1 of the pin holding portion 112A. Therefore, in the closed position, the end 121B of the stopper 121 abuts against the surface SF2 of the pin holding portion 112B, thereby determining the position of the first shaft portion 101. The surface SF1 of the pin holding portion 112A is away from the surface SF2 of the pin holding portion 112B. As a result, the size of the fork gap CL is the second interval CL2B. The second interval CL2B is larger than the second interval CL2A. In this way, the size of the fork gap CL (second interval CL2) in the closed position can be adjusted by the protrusion amount of the end 121B of the stopper 121 from the pin holding portion 112A. In addition, the stopper 121 may be provided in the pin holding portion 112B and abut against the surface SF1 of the pin holding portion 112A.

[0067] Fig.12 This is an explanatory diagram for explaining the bending of both end portions of the strip material TP by the pair of fork portions 62 . Fig.13 It is a perspective view showing a pair of fork portions 62 in a state where both end portions of the strip material TP are bent. Fig.14 TP is a three-dimensional diagram for explaining the shape of the strip TP in a state where both ends are bent. Fig.12 As shown, the pair of forks 62 are rotated in opposite directions by the rotation drive parts 63A and 63B in a state where the two end portions of the strip TP are inserted into the respective fork gaps CL. The rotation direction of the pair of forks 62 is the direction in which the ends of the held strip TP are wound downward. Fig.13 and Fig.14 As shown, the two end portions of the tape TP inserted into the fork gap CL are folded inwardly and arranged to overlap below the middle portion between the two ends of the tape TP. The length of the folded end portion (the length of the overlapping portion of the tape TP) is referred to as the folded length L of the tape TP. The folded portion FB of the folded length L is a sewing portion (sewing edge) to be sewn by the sewing machine 7.

[0068] The size of the fork gap CL of the pair of forks 62 is adjusted to a suitable size such that: the strip TP is not clamped or pressed, the strip TP and the pin members 111A and 111B can slide, and the strip TP and the pin members 111A and 111B are not separated excessively. If the fork gap CL is too small, the strip TP is clamped in a compressed state, and as it is bent, the two ends of the strip TP are wound by the pair of forks 62, and excessive tension acts between the two ends of the strip TP. In this case, the clearance (dimensional margin) required for the belt loop cannot be formed, and the loose formation is also hindered. In addition, since the friction (sliding resistance) between the strip TP and the pair of forks 62 increases, it also causes the formation of the folding angle described later. If the fork gap CL is too large, the folding length L is excessively increased. The size of the fork gap CL also depends on the thickness of the strip TP (in other words, the type of fabric). Therefore, the size of the fork gap CL during bending (closed position) is adjusted to an appropriate size using the opening and closing mechanism 103 and the adjustment unit 120.

[0069] (Operation of the belt loop supply device)

[0070] The belt loop supply device 6 is controlled by the control device 8 as follows. Figure 4 As shown, the loop supply device 6 waits at the waiting position P3 until the tape TP is arranged at the loop forming position Q3. At the waiting position P3, the ends (+Y direction ends) of the pair of forks 62 are away from the conveying path of the tape TP in the -Y direction.

[0071] The control device 8 controls the feeding device 2 and the pulling device 4, so that the feeding device 2 feeds the strip TP to the gripping position Q2, and the pulling device 4 pulls the strip TP in the +X direction to the pulling length position. At this time, if the pulling device 4 moves in the +X direction beyond the position of the supporting device 5, the control device 8 controls the supporting device 5 to raise the pair of supporting plates 51 that previously retreated to the lower side of the moving path of the gripping portion 41 to the supporting position, and clamps the strip TP from the top and bottom using the pair of supporting plates 51 and the abutting plate. In the case of loose formation, the control device 8 controls the supporting device 5 to further raise the loose forming plate 54. The control device 8 controls the cutting device 3 to cut the strip TP pulled out to the pulling length position using the movable knife 32 (and the fixed knife). In addition, the control device 8 controls the pulling device 4 to pull the strip TP from the pulling length position to the belt loop forming position Q3. In the above manner, the preparation for bending the strip TP by the belt loop supply device 6 is completed. The tape material TP is in a state where the end in the +X direction is arranged at the tape loop forming position Q3 and the middle portion in the longitudinal direction is sandwiched between the pair of support plates 51 (and the loose forming plate 54 ) and the contact plate.

[0072] The belt loop supply device 6 operates the opening and closing mechanism 103 so that the size of the fork gap CL of each pair of forks 62 becomes the first interval CL1 (the first shaft portion 101 is arranged in the open position). The belt loop supply device 6 uses the moving mechanism 65 to move the ring bending portion 61 from the standby position P3 to the bending position P2, that is, to the +Y direction. The ring bending portion 61 reaches the bending position P2, thereby inserting the two end portions of the strip TP into the fork gap CL of the pair of forks 62. As a result, at the bending position P2, the ends (ends in the +Y direction) of the pair of forks 62 are closer to the +Y direction than the strip TP. The belt loop supply device 6 operates the opening and closing mechanism 103 so that the size of the fork gap CL of each pair of forks 62 becomes the second interval CL2 (the first shaft portion 101 and the second shaft portion 102 are arranged in the closed position). The belt loop supply device 6 operates each rotation drive unit 63, and uses the pair of forks 62 to respectively bend the two end portions of the strip TP inserted into the fork gap CL. Through the operation of each rotation driving part 63, the pair of fork parts 62 are respectively rotated. Fig.13 and Fig.14 As shown in FIG. 1 , a folded portion FB is formed in the strip TP. Thus, the strip TP is deformed into a strip loop shape.

[0073] The belt loop supply device 6 holds the belt material TP with both ends bent, and moves the loop bending portion 61 from the bending position P2 to the sewing position P1, i.e., in the +Y direction, by means of the moving mechanism 65. The pair of forks 62 holding the belt material TP are arranged directly below the presser foot 74 of the sewing machine 7.

[0074] The control device 8 controls the sewing machine 7 to lower the presser foot 74 of the sewing machine 7 from the raised position at the sewing position P1. The tape TP is pressed from above toward the needle plate 73 (feed member 76A) by the presser foot 74. Thus, the tape TP with both ends bent is held by the sewing machine 7 at the sewing position P1.

[0075] The belt loop supply device 6 uses the moving mechanism 65 to move the loop bending portion 61 from the sewing position P1 to the standby position P3, that is, to the -Y direction. The pair of forks 62 holding the two end portions of the belt material TP are pulled out from the belt material TP in the -Y direction while the belt material TP is pressed by the presser foot 74. Thus, the supply of the belt loop to the sewing position P1 by the belt loop supply device 6 is completed.

[0076] (Sewing Machine)

[0077] Fig.15 It is an enlarged perspective view showing the vicinity of a sewing position P1 of the sewing machine 7 according to the embodiment. Fig.16 This is a perspective view of the presser foot 74 according to the embodiment as viewed from below.

[0078] like Fig.15As shown, the sewing machine 7 includes, at the sewing position P1 , a pair of needle holding portions 72 that respectively hold sewing machine needles 77 , and a pair of presser feet 74 that are provided corresponding to the pair of needle holding portions 72 .

[0079] A pair of needle holding parts 72 respectively hold the sewing machine needle 77 and reciprocate along the Z-axis direction. The pair of needle holding parts 72 hold the sewing machine needle 77 in a manner that the sewing machine needle 77 is parallel to the Z-axis. The pair of needle holding parts 72 are supported on the sewing machine head 71. The pair of needle holding parts 72 are arranged above the needle plate 73 and can be opposite to the surface of the sewing object. The pair of needle holding parts 72 are installed on a holding component 75 extending along the X-axis direction, and the holding component 75 is connected to a power transmission mechanism that uses the power of the spindle motor 79 to move up and down. A pair of sewing machine needles 77 are respectively held in a pair of needle holding parts 72 arranged at a predetermined interval along the X-axis direction. The interval in the X-axis direction of the pair of sewing machine needles 77 corresponds to the interval in the X-axis direction of the sewing part of the tape TP. The sewing machine needle 77 has a threading hole for the upper thread to pass through. The sewing machine needle 77 holds the upper thread with the inner surface of the threading hole. Since the needle holding portion 72 reciprocates in the Z-axis direction, the sewing machine needle 77 reciprocates in the Z-axis direction while holding the upper thread.

[0080] The sewing machine needle 77 held by the needle holding portion 72 is opposed to the needle plate 73 along the Z-axis direction. The needle plate 73 has a needle hole through which the sewing machine needle 77 can pass. The sewing machine needle 77 that penetrates the sewing object supported by the needle plate 73 passes through the needle hole. In addition, a feed member 76A (see FIG. 1 ) having feed teeth formed thereon is provided on the upper surface of the needle plate 73. Figure 1 ), but in Fig.15 The feeding mechanism 76 has a feeding member 76A for carrying the sewing object and the tape TP, and by moving the feeding member 76A, the sewing position of the sewing object and the tape TP is moved to the needle drop position. The feeding member 76A is formed with an opening for exposing a portion of the needle hole of the needle plate 73.

[0081] A kettle is arranged below the needle plate 73. The kettle holds the bobbin contained in the bobbin box. The kettle rotates in conjunction with the needle holder 72. The kettle supplies the lower thread from the bobbin. The kettle hooks the upper thread from the sewing machine needle 77 that penetrates the tape TP and passes through the needle hole of the needle plate 73. The kettle winds the upper thread and the lower thread. The coordinated action of the kettle and the sewing machine needle 77 forms a stitch.

[0082] The spindle motor 79 generates power. The power generated by the spindle motor 79 is transmitted to the holding member 75, the thread take-up lever and the kettle via a power transmission mechanism (not shown). The holding member 75, the thread take-up lever and the kettle are linked. By transmitting the power generated by the spindle motor 79 to the holding member 75, the pair of needle holding parts 72 and the sewing machine needle 77 reciprocate along the Z-axis direction.

[0083] The presser foot 74 presses the sewing object from above. The presser foot 74 is supported by a feed mechanism 76. The presser foot 74 moves in the feed direction in conjunction with the feed member 76A using the feed mechanism 76. The presser foot 74 is arranged above the needle plate 73, and the sewing object is held between the presser foot 74 and the feed member 76A. The presser foot 74 reciprocates along the Z-axis direction using a pressing drive unit 78. The pressing drive unit 78 is, for example, an air cylinder. A pair of presser feet 74 is provided corresponding to a pair of sewing machine needles 77. Hereinafter, when distinguishing a pair of presser feet 74, the presser foot located in the +X direction is set as presser foot 74A, and the presser foot located in the -X direction is set as presser foot 74B.

[0084] The presser foot 74A and the presser foot 74B are arranged around the corresponding sewing machine needle 77. The presser foot 74A and the presser foot 74B each include: a first foot component 150 and a second foot component 160. The first foot component 150 and the second foot component 160 of the presser foot 74A and the presser foot 74B are arranged symmetrically in the X-axis direction. The presser foot 74A in the +X direction has a first foot component 150 in the -X direction relative to the sewing machine needle 77, and has a second foot component 160 in the +X direction relative to the sewing machine needle 77. The presser foot 74B in the -X direction has a first foot component 150 in the +X direction relative to the sewing machine needle 77, and has a second foot component 160 in the -X direction relative to the sewing machine needle 77. That is, each first foot component 150 is arranged as follows Fig.14 The second leg member 160 is arranged on both sides of the strip TP to press the vicinity of the folded portion FB. The second leg member 160 is arranged on both sides of the strip TP to press the sewing object of the sewing strip TP. The second leg member 160 contacts the outermost end of the strip TP in the bent state in the X-axis direction. The outer second leg member 160 limits the position of the outermost end of the strip TP.

[0085] like Fig.16 As shown, the first leg member 150 has: a pressing plate 151 extending linearly along the Y-axis direction. A plurality of protrusions are formed on the lower surface of the pressing plate 151, and the plurality of protrusions are used to bite into the strip TP to increase the friction resistance. A columnar guide portion 152 protruding downward is provided at both edges of the pressing plate 151 in the X-axis direction. Two guide portions 152 are provided at each of the two edges in the X-axis direction. The two guide portions 152 provided at the same edge are arranged at a predetermined interval DG in the Y-axis direction. The predetermined interval DG of the guide portion 152 corresponds to the width dimension of the strip TP.

[0086] Fig.17This is an explanatory diagram for explaining the positional relationship between the guide portion 152 of the presser foot 74 and the fork portion 62 of the embodiment. In the embodiment, a notch portion 112K is formed at the end portion of the pin holding portion 112 of each of the pair of fork portions 62, into which the presser foot 74 of the sewing machine 7 arranged at the sewing position P1 enters. As described above, each of the pair of fork portions 62 has: a first shaft portion 101 and a second shaft portion 102, and the first shaft portion 101 and the second shaft portion 102 respectively have: a pin member (111A, 111B), and a pin holding portion (112A, 112B). A notch portion 112K is formed at the end portion of the pin holding portion (112A, 112B). And one side of the guide portion 152 of the first leg member 150 enters the portion of the notch portion 112K.

[0087] like Figure 7 As shown, the cutout 112K is provided on the surfaces SF1 and SF2 of the first shaft portion 101 and the second shaft portion 102 facing each other at the end of the pin holding portion 112. Therefore, when the first shaft portion 101 and the second shaft portion 102 are arranged in the closed position, the cutouts 112K of the respective pin holding portions 112 are close to each other to form a space (refer to Figure 8 ). Regarding this space, Fig.17 As shown in FIG. 1 , when the pair of forks 62 bend and hold the two ends of the tape TP, the space is adjacent to the edge of the tape TP in the -Y direction and is a space that penetrates along the Z-axis direction. At the sewing position P1, if the presser foot 74 is lowered from above the tape TP, Fig.16 The guide portion 152 on the -Y direction side shown enters the space of the cutout portion 112K and faces the -Y direction side of the tape TP. In addition, the guide portion 152 on the +Y direction side enters between the two pin components 111A and 111B (i.e., the fork gap CL) and faces the +Y direction side of the tape TP. When the guide portion 152 is arranged on both sides of the tape TP in the Y direction, a pair of forks 62 are pulled out from the sewing position P1 in the -Y direction, leaving the tape TP. At this time, the guide portion 152 becomes a wall that limits the positional deviation of the tape TP in the Y direction. As a result, in the folded-back portion FB of the tape TP, the positional deviation of the so-called fold (Japanese: ドッグイヤー) is suppressed. The fold refers to: in the folded-back portion FB, the portion of the upper tape and the end of the tape TP overlapping the lower side are offset in the Y-axis direction, resulting in a state in which the lower end protrudes from the upper tape TP.

[0088] return Fig.16 The second leg member 160 has a pressing plate 161 extending linearly along the Y-axis direction. A protruding wall 162 extending downward is provided at both edges of the pressing plate 161 in the X-axis direction. A plurality of teeth for biting into the sewing object to increase the friction resistance are formed at the distal end (lower end) of the protruding wall 162.

[0089] Fig.18 This is an explanatory diagram of the positional relationship during sewing in which the end portion of the tape TP on the +X side is pressed by the presser foot 74A according to the embodiment, as viewed in the Y-axis direction. Fig.19 1 is an explanatory diagram of the positional relationship when sewing by pressing the end of the +X side of the tape TP with the presser foot 74A along the X-axis direction according to the embodiment. Fig.18 As shown, the second leg member 160 limits the X-axis direction position of the outermost end of the strip TP by making the side surface of the protruding wall 162 on the inner side in the X-axis direction (the -X direction side in the case of the presser foot 74A, the +X direction side in the case of the presser foot 74B) contact the outermost end of the strip TP in the bent state. Fig.19 As shown, the first leg member 150 limits the positional deviation of the tape TP in the Y-axis direction by arranging the folded portion FB of the tape TP between the guide portions 152 arranged at a predetermined interval DG. In this state, the portion between the first leg member 150 and the second leg member 160 of the tape TP is sewn using a sewing machine needle 77. As a result, the folded portion FB of the tape TP is sewn to the sewing object. Here, the presser foot 74A on the +X direction side is described, but the same is true for the presser foot 74B on the -X direction side, so a detailed description of the presser foot 74B is omitted. The presser foot 74B is symmetrical with the presser foot 74A in order to press the end of the tape TP on the -X direction side, so in the case of the presser foot 74B, it becomes Fig.18 Furthermore, the guide portion 152 of the first leg member 150 of the presser foot 74B also enters the fork gap CL and the cutout portion 112K of the fork portion 62 on the -X direction side, thereby limiting the positional deviation of the strip TP in the Y-axis direction.

[0090] In this way, the sewing machine 7 uses a pair of sewing needles 77 to sew both ends of the tape TP supplied to the sewing position P1 in the X-axis direction. When the sewing is completed, the control device 8 releases the pressing by raising each presser foot 74. Thus, the sewing object with the tape loop (tape TP) sewn thereon is removed from the sewing machine 7.

[0091] (Effect)

[0092] As described above, according to the present embodiment, the belt loop supply device 6 includes: a ring bending portion 61 including a pair of forks 62 for inserting the two end portions of the thin belt-shaped belt material TP into the fork gap CL, and a rotation drive portion 63 for rotating the pair of forks 62 to bend the two end portions, and the ring bending portion 61 forms a seam edge by bending the two end portions of the belt material TP, and a moving mechanism 65 for moving the ring bending portion 61 to the bending position P2 and the sewing position P1. The pair of forks 62 each include a first shaft portion 101 and a second shaft portion 102 for forming the fork gap CL, and an opening and closing mechanism 103 for relatively moving the first shaft portion 101 and the second shaft portion 102 to the following positions: an open position where the size of the fork gap CL is a first gap CL1, and a closed position where the size of the fork gap CL is a second gap CL2 smaller than the first gap CL1.

[0093] Thus, the strip TP can be inserted into the fork gap CL while the fork gap CL is expanded to the first gap CL1. After the strip TP is inserted, the fork gap CL is reduced to the second gap CL2, so that the folded-back length L of the strip TP can be made smaller than that of the first gap CL1. As a result, the strip TP can be easily inserted into the fork gap CL, and the two ends of the strip TP can be folded back with appropriate sizes.

[0094] In addition, in the present embodiment, each of the pair of forks 62 further includes an adjustment portion 120 for adjusting the size of the second interval CL2. Thus, the folding length L of the two ends of the strip TP can be appropriately adjusted according to the design of the belt loop and the thickness of the strip TP. In addition, in the present embodiment, the adjustment portion 120 includes a stopper 121 capable of position adjustment, and the stopper 121 determines the size of the second interval CL2 by abutting against the second shaft portion 102 in the closed position. Thus, the adjustment portion 120 can be provided on the pair of forks 62 with a simple structure. In addition, the adjustment portion 120 can also be provided on the second shaft portion 102 in a manner abutting against the first shaft portion 101 in the closed position, in which case the same effect as in the present embodiment can be obtained.

[0095] In addition, in this embodiment, the opening and closing mechanism 103 includes: a rotating shaft 103A that rotatably supports the first shaft portion 101; and a driving cylinder 103B that rotates the first shaft portion 101 around the rotating shaft 103A. Since the size of the fork gap CL is changed by the rotation of the first shaft portion 101, it is possible to suppress the enlargement of the distal end portion of the pair of forks 62.

[0096] In addition, in the present embodiment, the first shaft portion 101 and the second shaft portion 102 each have a pin member 111 and a pin holding portion 112 that holds the pin member 111 in a manner protruding from the end portion, and a cutout portion 112K is formed at the end portion of the pin holding portion 112, and the cutout portion 112K is provided for the presser foot 74 (specifically, the guide portion 152) of the sewing machine 7 disposed at the sewing position P1 to enter. As a result, when the tape TP is supplied to the sewing position P1, the presser foot 74 can enter between the tape TP and the end portion of the pin holding portion 112. In addition, the positional deviation of the tape TP can be effectively suppressed by utilizing a portion of the entered presser foot 74. In particular, when the pin member 111 is pulled out in a pressed state, the positional deviation of the folded-back portion FB of the tape TP caused by being dragged by the pin member 111 can be effectively suppressed, thereby improving the quality of the finished tape loop.

[0097] (Other Implementations)

[0098] The technical scope of the present disclosure is not limited to the above-described embodiments, and appropriate changes can be made without departing from the gist of the present disclosure.

[0099] For example, in the above-mentioned embodiment, the belt loop supply device 6 inserts the two end portions of the belt TP into the fork gap CL by bringing the pair of forks 62 close to the belt TP after the belt TP is cut by the cutting device 3. Alternatively, the belt loop supply device 6 inserts the two end portions of the belt TP into the fork gap CL by bringing the pair of forks 62 close to the belt TP before the belt TP is cut by the cutting device 3. In this case, the belt TP is cut by the cutting device 3 after the two end portions of the belt TP are inserted into the fork gap CL.

Claims

1. A belt loop supply device, comprising: a loop bending portion, and a moving mechanism, The ring bending portion comprises: a pair of forks, which respectively insert the two end portions of the thin strip-shaped strip into the fork gap; and a rotation driving portion, which rotates the pair of forks respectively to bend the two end portions, and the ring bending portion forms a seam edge by bending the two end portions of the strip. The moving mechanism moves the ring bending portion to a bending position and a sewing position. Each of the pair of forks includes a first shaft portion and a second shaft portion forming the fork gap, and an opening and closing mechanism. The opening and closing mechanism relatively moves the first shaft portion and the second shaft portion to an open position where the fork gap has a first gap and a closed position where the fork gap has a second gap smaller than the first gap.

2. The belt loop supply device according to claim 1, characterized in that: Each of the pair of forks further includes an adjustment portion for adjusting a size of the second interval.

3. The belt loop supply device according to claim 2, characterized in that: The adjustment portion includes a stopper capable of position adjustment, and the stopper determines the size of the second interval by abutting against the first shaft portion or the second shaft portion at the closed position.

4. The belt loop supply device according to any one of claims 1 to 3, characterized in that: The opening and closing mechanism includes: a rotation shaft that rotatably supports the first shaft portion; and a drive cylinder that rotates the first shaft portion around the rotation shaft.

5. The belt loop supply device according to any one of claims 1 to 3, characterized in that: Each of the first shaft portion and the second shaft portion includes a pin member and a pin holding portion that holds the pin member in a manner protruding from a distal end portion. A notch portion is formed at the distal end portion of the pin holding portion, and a presser foot of a sewing machine disposed at the sewing position enters the notch portion.

6. A belt loop sewing device, comprising: A belt loop supply device that bends both end portions of a thin belt-shaped belt material to form a seam edge and transports the belt material to a sewing position; and a sewing machine for sewing the two end portions of the tape conveyed to the sewing position onto an object to be sewn, The belt ring supply device comprises: a ring bending portion and a moving mechanism, The ring bending portion includes: a pair of forks, which respectively insert the two end portions of the strip into fork gaps; and a rotation driving portion, which rotates the pair of forks respectively to bend the two end portions. The moving mechanism moves the ring bending portion to the bending position and the sewing position. Each of the pair of forks includes a first shaft portion and a second shaft portion forming the fork gap, and an opening and closing mechanism. The opening and closing mechanism relatively moves the first shaft portion and the second shaft portion to an open position where the fork gap has a first gap and a closed position where the fork gap has a second gap smaller than the first gap.

Images