JP2022027312A - Sewing device - Google Patents

Abstract

To provide a sewing device which can stably keep the length of a needle thread and a bobbin thread remaining on the rear of an object to be sewn shorter than before, in the sewing device which includes a middle presser, a thread cutting mechanism and a thread wiping mechanism and which performs thread wiping after cutting the needle thread and the bobbin thread.SOLUTION: A sewing device includes a needle bar, a needle bar mechanism, a middle presser bar, a needle plate, a thread cutting mechanism, a thread wiping mechanism, a driving source, and a drive control unit. The middle presser bar has a middle presser at a lower end and extends vertically in parallel with the needle bar. The thread cutting mechanism cuts the needle thread below the needle plate. The thread wiping mechanism performs thread wiping in which an end of the needle thread cut by the needle cutting mechanism is moved above the middle presser. The driving source vertically moves the middle presser bar, and vertically moves between a contact position where the middle presser comes into contact with an object to be sewn and a separation position further upward than the contact position. The drive control unit controls the driving source and brings the middle presser to the contact position, at the needle thread cutting time by the needle cutting mechanism and the thread wiping time by the thread wiping mechanism respectively (S8, S11).SELECTED DRAWING: Figure 6

Description

The present invention relates to a sewing device.

The conventional sewing device is provided with a center presser, a thread trimming mechanism, and a thread feeding mechanism. The middle presser intermittently presses the sewn object placed on the upper surface of the needle plate. At the end of sewing, the thread trimming mechanism cuts the needle thread and the bobbin thread below the needle plate with the needle bar stopped at a position in the middle of descending from the top dead center to the bottom dead center. After cutting the needle thread, the thread sweeping mechanism performs thread sweeping with the center presser located at the bottom dead center and the needle bar located at the top dead center, and moves the cut end edge of the needle plate from the bottom to the top of the needle plate. do.

Japanese Unexamined Patent Publication No. 2009-50364

In the sewing device, when the length between the sewing material and the needle plate becomes long, the length of the thread remaining on the back of the sewing material becomes long, and the quality of the sewing material deteriorates.

The present invention is provided with a center presser, a thread trimming mechanism, and a thread sweeping mechanism, and in a sewing device that performs thread sweeping after cutting the needle thread and the bobbin thread, the lengths of the needle thread and the bobbin thread remaining on the back of the object to be sewn are longer than before. It is an object of the present invention to provide a sewing device capable of being stably kept short.

The sewing device according to claim 1 of the present invention has a needle bar that extends in the vertical direction and can be attached with a sewing needle at the lower end, a needle bar mechanism that moves the needle bar up and down, and a middle presser at the lower end. A middle presser bar extending in the vertical direction in parallel with the needle plate, a needle plate having a needle hole for inserting the sewing needle, and a needle plate on which the sewing material is placed, and a thread trimming mechanism for cutting the needle thread and the bobbin thread below the needle plate. In a sewing device provided with a thread sweeping mechanism that moves the end of the needle thread cut by the thread trimming mechanism above the center presser, the center presser bar is moved up and down to move the center presser. A drive source that moves up and down between a contact position that comes into contact with the sewing object and a separation position above the contact position, when the needle thread and the bobbin thread are cut by the thread trimming mechanism, and the thread sweeping. It is provided with a drive control unit that controls the drive source and positions the middle presser at the contact position, respectively, when the thread is pulled by the mechanism. Since the sewing device cuts the needle thread and bobbin thread below the needle plate with the thread trimming mechanism while the object to be sewn is pressed by the middle presser, the length of the needle thread and bobbin thread remaining on the back of the sewing object is longer than before. It can be kept stable and short.

The drive control unit of the sewing device according to claim 2 of the present invention controls the drive source when the upper thread and the lower thread are cut by the thread trimming mechanism, and then positions the middle presser at the contact position. The vertical position of the middle presser is maintained at the contact position until the thread feeding by the thread feeding mechanism is completed. The sewing device performs the process of moving the middle presser compared to the case where the upper and lower positions of the middle presser are changed between the time when the needle thread and the bobbin thread are cut by the thread trimming mechanism and the time when the thread is threaded by the thread feeding mechanism. It's easy.

The drive control unit of the sewing device according to claim 3 of the present invention synchronizes with the descent of the needle bar by the needle bar mechanism at the time of the final needle immediately before cutting the needle thread and the bobbin thread by the thread trimming mechanism. The middle presser is lowered to the contact position, and the middle presser is maintained at the contact position when the needle bar is raised by the needle bar mechanism. The sewing device can easily move the center presser in synchronization with the movement of the needle bar.

The sewing device according to claim 4 of the present invention further includes a position setting unit for setting the contact position of the middle presser to a position different from the lower end position when the middle presser moves up and down during sewing. The control unit controls the drive source at the time of cutting the needle thread and the bobbin thread by the thread trimming mechanism and at the time of thread feeding by the thread sweeping mechanism, and sets the center presser to the position setting unit. Is located at the contact position set by. By setting the contact position, the sewing device can adjust the lengths of the needle thread and bobbin thread remaining on the back of the object to be sewn.

The sewing device according to claim 5 of the present invention further includes a time setting unit for setting a time for moving the middle presser to the contact position with respect to the descent of the needle bar, and the drive control unit is based on the thread trimming mechanism. When the upper thread and the lower thread are cut, the middle presser is lowered to the contact position at the time set by the time setting unit with respect to the lowering of the needle bar. By setting the timing for moving the middle presser to the contact position, the sewing device can more reliably cut the needle thread and the bobbin thread by the thread trimming mechanism when the middle presser is located at the contact position.

The sewing device according to claim 6 of the present invention further includes an input unit, and the position setting unit sets the input result of the input unit to the contact position. The sewing device can set the contact position according to the input result input by the operator, and can improve the convenience of the operator.

The sewing device according to claim 7 of the present invention further includes an input unit, and the time setting unit sets the input result of the input unit to the time when the middle presser is moved to the contact position. The sewing device can set the time to move the middle presser to the contact position according to the input result input by the operator, and can improve the convenience of the operator.

The perspective view of the sewing apparatus 1. The perspective view of the needle bar mechanism 6 and the hook mechanism 7. The perspective view of the needle bar mechanism 6 and the hook mechanism 7. The perspective view of the needle bar mechanism 6 and the hook mechanism 7. The block diagram which shows the electric structure of a sewing apparatus 1. Flow chart of main processing. The vertical position of the needle bar 63 with respect to the angle of the output shaft of the main motor 32 at the time of final needle sewing, the lowering machine T1 of the middle presser mechanism 120, the ascending machine T4, the thread cutting machine T2 of the thread trimming mechanism 110, and the thread feeding mechanism 130. The graph which shows the time machine T3 and the time machine T5 at the end of sewing. The schematic diagram of the middle presser 64 at the contact position of the specific example 1 at the time of thread trimming, and the sewing needle 65 above the needle plate 74. The schematic diagram of the middle presser 64 at the contact position of the specific example 2 at the time of thread trimming, and the sewing needle 65 above the needle plate 74.

The physical configuration of the sewing apparatus 1 according to the embodiment of the present invention will be described. In the following description, left and right, front and back, and up and down indicated by arrows in the figure are used. As shown in FIGS. 1 to 4, the sewing device 1 is a gate-type sewing device, and is a bed portion 2, a pedestal portion 3, 4, a synchronization mechanism 31 (see FIG. 5), a beam portion 5, a needle bar mechanism 6, and a middle portion. It includes a presser mechanism 120, a thread feeding mechanism 130, a kettle mechanism 7, a thread trimming mechanism 110, a holding mechanism 8, a transport mechanism 9 (see FIG. 5), a feed mechanism 10 (see FIG. 5), and an operation unit 14.

The bed portion 2 includes a base portion 21, a first mounting portion 22, a second mounting portion 76, openings 24 and 25, bellows 26 and 27, a frame body 28, a lower rail 29, and a pair of rails. The base 21 has a substantially rectangular parallelepiped shape. The first mounting portion 22 is a plate that forms the upper surface of the base portion 21 and extends in parallel with the horizontal plane. The first mounting portion 22 includes an opening 23 extending in the left-right direction. The second mounting portion 76 has a rectangular plate shape arranged in front of the first mounting portion 22 so as to be flush with the first mounting portion 22. The opening 24 extends in the front-rear direction near the left end of the first mounting portion 22. The opening 25 extends in the front-rear direction near the right end of the first mounting portion 22. The openings 24 and 25 are portions that extend in a rectangular shape in a plan view between the front end portion and the rear end portion of the first mounting portion 22, respectively, and open upward. The bellows 26, 27 cover the openings 24, 25, respectively. The pair of rails are provided below the bellows 26, 27. The pair of rails support the connecting portions 78 and 79 of the feed mechanism 10 so as to be movable in the front-rear direction. The frame 28 is a grid-like structure and supports the base 21 from below. The lower rail 29 extends in the left-right direction below the first mounting portion 22. The lower rail 29 supports the kettle mechanism 7 so as to be movable left and right. The bed portion 2 has a lower belt 94, a lower spline shaft 34, and a hook mechanism 7, which will be described later, arranged below the first mounting portion 22.

The pedestal portions 3 and 4 are substantially square pillars, respectively. The pedestal portion 3 extends upward at substantially the center of the left end portion of the bed portion 2 in the front-rear direction. The pedestal portion 4 extends upward at substantially the center of the right end portion of the bed portion 2 in the front-rear direction. The pedestal portions 3 and 4 are separated in the left-right direction with the first mounting portion 22 in between. The synchronization mechanism 31 is a mechanism for synchronously driving the needle bar mechanism 6 and the hook mechanism 7, and includes a main motor 32 (see FIG. 5), an upper spline shaft 33, a lower spline shaft 34, and a transmission mechanism. The main motor 32 is supported by the pedestal portion 3. The upper spline shaft 33 and the lower spline shaft 34 extend in the left-right direction between the pedestal portions 3 and 4. The transmission mechanism of the synchronization mechanism 31 is housed in the pedestal portion 3, and the power of the main motor 32 is transmitted to the upper spline shaft 33 and the lower spline shaft 34. The transport mechanism 9 can move the kettle mechanism 7 and the needle bar mechanism 6 in the left-right direction parallel to the horizontal direction with respect to the sewn object W (see FIGS. 8 and 9), and the upper belt 93 and the lower belt 94, which will be described later. It is equipped with an X motor 95 and a transmission mechanism. In the sewing device 1 of this example, the holding mechanism 8 holds the sewn object W. The X motor 95 is a pulse motor and is supported by the pedestal portion 4. The transmission mechanism of the transport mechanism 9 is housed in the pedestal portion 4, and the power of the X motor 95 is transmitted to the upper belt 93 and the lower belt 94. The upper belt 93 is fixed to the back surface of the needle bar mechanism 6. The lower belt 94 is fixed to the back surface of the kettle mechanism 7. The hook mechanism 7 and the needle bar mechanism 6 move left and right according to the rotation of the X motor 95.

The beam portion 5 is erected between the pedestal portions 3 and 4 and extends in the left-right direction. The beam portion 5 supports the needle bar mechanism 6 on the rear side with respect to the needle bar mechanism 6 so as to be movable in the left-right direction parallel to the horizontal direction. The beam portion 5 includes a housing 51, a bellows 52, and an upper rail 53. The housing 51 extends in the left-right direction from the upper end portions and the rear end portions of the pedestal portions 3 and 4, respectively. The bellows 52 is erected at the front ends of the pedestal portions 3, 4 and the housing 51, and at the left and right ends of the needle bar mechanism 6 described later. The upper rail 53 has a rod shape extending in the left-right direction, and is erected between the pedestal portions 3 and 4. The upper rail 53 supports the needle bar mechanism 6 so as to be movable in the left-right direction. The housing 51 covers the upper rail 53 and the upper side and the rear side of the upper spline shaft 33 of the synchronization mechanism 31. The bellows 52 covers the front side of the upper rail 53 and the upper spline shaft 33. The bellows 52 expands and contracts according to the left-right movement of the needle bar mechanism 6.

The needle bar mechanism 6 is provided on the front side with respect to the beam portion 5. The needle bar mechanism 6 includes a housing 60, an upper shaft 61, a transmission mechanism 62, and a needle bar 63, and can move the needle bar 63 up and down. The housing 60 has a box shape and accommodates the upper shaft 61. The back surface of the housing 60 is connected to the upper belt 93, and the housing 60 is supported by the upper rail 53. The needle bar mechanism 6 can be moved left and right along the upper rail 53 in the beam portion 5 by driving the transport mechanism 9. The upper shaft 61 extends in the left-right direction. The transmission mechanism 62 transmits the power of the upper spline shaft 33 to the upper shaft 61. The needle bar 63 extends in the vertical direction, and a sewing needle 65 can be attached to the lower end portion. The needle bar 63 is connected to the upper shaft 61 and moves up and down by the drive of the main motor 32.

The middle presser mechanism 120 includes a middle presser bar 69, a middle presser motor 68, and a transmission mechanism 121. In FIG. 2, the middle presser motor 68 and the transmission mechanism 121 are not shown. The middle presser bar 69 has a middle presser bar 64 at the lower end and extends in the vertical direction in parallel with the needle bar 63. The middle presser 64 has a through hole through which the sewing needle 65 passes according to the vertical movement of the needle bar 63, and intermittently presses the workpiece W from above. The middle presser motor 68 is a pulse motor fixed to the upper surface of the housing 60. The middle presser motor 68 moves the middle presser bar 69 up and down, and moves the middle presser 64 up and down between the contact position where the middle presser 64 comes into contact with the sewing material W and the separation position above the contact position. The transmission mechanism 121 is connected to the output shaft of the middle presser motor 68 and the middle presser bar 69, and transmits the rotation of the output shaft of the middle presser motor 68 to the middle presser bar 69.

The thread sweeping mechanism 130 performs thread sweeping by moving the end of the needle thread M (see FIGS. 8 and 9) cut by the thread trimming mechanism 110 to the upper side of the center presser 64. The threading mechanism 130 includes an air cylinder 131, a link 134, a threading shaft 135, and a threading lever 136. The thread sweeping mechanism 130 is fixed to the back surface of the housing 60 of the sewing device 1. The air cylinder 131 sucks the output shaft. The link 134 is connected to the output shaft of the air cylinder 131 and the threading shaft 135, and the threading shaft 135 rotates via the link 134 due to the movement of the output shaft. The threader lever 136 is fixed to the threader shaft 135 and swings by the rotation of the threader shaft 135. The tip of the threading lever 136 moves from the standby position to the threading position when the air cylinder 131 sucks the output shaft. As shown in FIGS. 2 and 3, in the standby position, the tip of the thread sweep lever 136 is on the right side of the thread sweep shaft 135. In the threading position, the tip of the threading lever 136 is below the threading shaft 135. In the process of moving the tip of the threading lever 136 from the standby position to the threading position, the tip of the threading lever passes between the lower end of the sewing needle 65 and the upper end of the tubular portion of the center presser 64 at the vertical position to capture the needle thread M. When the suction by the air cylinder 131 is stopped, the tip of the thread sweeping lever 136 is moved to the standby position by the urging force of the spring. Therefore, the thread sweeping lever 136 can move the needle thread M above the middle presser 64. The bobbin thread L remains on the back side (the side facing the needle plate 74) of the sewn object W.

The hook mechanism 7 is arranged below the needle bar mechanism 6 and inside the bed portion 2. The hook mechanism 7 includes a housing 70, a lower shaft 71, a transmission mechanism 72, and a hook 73. The housing 70 has a box shape and is provided with a needle plate 74 at the upper left end. The needle plate 74 has a needle hole 75 through which the sewing needle 65 can be inserted. The needle hole 75 is below the needle bar 63. As shown in FIGS. 8 and 9, the needle hole 75 has a counterbore 77 at the upper end portion. The counterbore 77 is a tapered portion having a larger hole diameter on the upper side. The upper end portion of the counterbore 77 is larger than the diameter Q1 of the tubular lower end portion of the center presser 64. As shown in FIG. 2, the back surface of the housing 70 is connected to the lower belt 94. The housing 70 inserts the lower spline shaft 34. The housing 70 is supported by the lower rail 29. The hook mechanism 7 can move left and right along the lower rail 29 in synchronization with the needle bar mechanism 6 by driving the transport mechanism 9. The transmission mechanism 72 transmits the power of the lower spline shaft 34 to the lower shaft 71. The hook 73 is connected to the lower shaft 71, and is driven by the main motor 32 to rotate in synchronization with the vertical movement of the needle bar 63.

The thread trimming mechanism 110 cuts the needle thread M and the bobbin thread L below the needle plate 74. As shown in FIGS. 3 and 4, the thread trimming mechanism 110 includes a fixed blade 111, a movable blade 112, a thread trimming motor 113, and a link mechanism 114. A part of the link mechanism 114 and the thread trimming motor 113 are provided on the outside of the housing 70. The thread trimming mechanism 110 moves the movable blade 112 via the link mechanism 114 to cut the needle thread M and the bobbin thread L. The fixing blade 111 is fixed to the lower side of the needle plate 74. The movable blade 112 is provided so as to be rotatable horizontally with respect to the fixed blade 111. The movable blade 112 has a standby position at a position away from the fixed blade 111, a cutting position that intersects the fixed blade 111 to cut the needle thread M and the bobbin thread L, and a position opposite to the standby position with respect to the cutting position. You can move between the maximum movable position. The thread trimming motor 113 is a pulse motor and drives the movable blade 112. The link mechanism 114 is connected to the output shaft of the thread trimming motor 113 and the movable blade 112, and transmits the rotation of the output shaft to the movable blade 112. When the movable blade 112 moves from the standby position to the maximum movable position, the tip 116 of the movable blade 112 plunges into the loop of the needle thread M and captures the needle thread M. When the movable blade 112 rotates and returns from the maximum movable position to the standby position, the blade portion of the movable blade 112 and the blade portion of the fixed blade 111 are at the cutting position between the maximum movable position and the standby position, and the bobbin thread L and the upper thread. Of the loops of the thread M, the needle thread M on the side to be sewn W is cut at the same time.

The feed mechanism 10 can move the holding mechanism 8 holding the sewn object W back and forth relative to the needle bar mechanism 6 and the hook mechanism 7. The feed mechanism 10 includes connecting portions 78 and 79. The lower left end of the connecting portion 78 is arranged on the rail in the opening 24 of the bed portion 2. The lower right end of the connecting portion 79 is arranged on the rail in the opening 25 of the bed portion 2. The connecting portions 78 and 79 are connected to the holding mechanism 8. The holding mechanism 8 can hold the sewn object W. The holding mechanism 8 has an upper frame 81, a lower frame 82, and air cylinders 83, 84. The upper frame 81 and the lower frame 82 are rectangular frames in a plan view, and the sewn object W is sandwiched between them. The upper frame 81 opens and closes up and down with respect to the lower frame 82 using the air cylinders 83 and 84 as a drive source.

The feed mechanism 10 includes a Y motor 101 (see FIG. 5), a transmission mechanism, and a pair of belts below the first mounting portion 22. The Y motor 101 is a pulse motor. The transmission mechanism of the feed mechanism 10 transmits the Y motor 101 to a pair of belts fixed to the connecting portions 78 and 79. The holding mechanism 8 moves back and forth along a pair of rails of the bed portion 2 according to the rotation of the Y motor 101.

The operation unit 14 is supported by the left end portion of the second mounting unit 76. The operation unit 14 includes a switch group 12 and a display unit 13. The switch group 12 inputs various instructions according to the operation of the operator. The display unit 13 is a liquid crystal display and can display various images.

The electrical configuration of the sewing device 1 will be described with reference to FIG. The control unit 15 of the sewing device 1 includes a CPU 16, a ROM 17, a RAM 18, a storage device 19, an input / output interface (I / O) 20, drive circuits 41 to 48, and the like. The CPU 16 controls the operation of the sewing device 1 in an integrated manner. The ROM 17 stores in advance a program or the like for executing various processes. The RAM 18 temporarily stores various information generated during execution of various processes. The storage device 19 is non-volatile and stores various set values.

The drive circuits 41 to 48, the encoders 55 to 59, and the switch group 12 are connected to the I / O 20. The drive circuit 41 is connected to the main motor 32 of the synchronization mechanism 31 and drives the main motor 32 by a control command of the CPU 16. The drive circuit 42 is connected to the X motor 95 of the transport mechanism 9, and drives the X motor 95 by a control command of the CPU 16. The drive circuit 43 is connected to the Y motor 101 of the feed mechanism 10 and drives the Y motor 101 by a control command of the CPU 16. The drive circuit 43 is connected to the air cylinders 83 and 84 of the holding mechanism 8 and drives the air cylinders 83 and 84 by the control command of the CPU 16. The drive circuit 45 is connected to the air cylinder 131 and drives the air cylinder 131 by a control command of the CPU 16. The drive circuit 46 is connected to the middle presser motor 68, and drives the middle presser motor 68 by a control command of the CPU 16. The drive circuit 47 is connected to the thread trimming motor 113, and drives the thread trimming motor 113 by a control command of the CPU 16. The drive circuit 48 is connected to the display unit 13 and displays various information on the display unit 13 by a control command of the CPU 16.

The encoder 55 detects the rotation position and rotation speed of the output shaft of the main motor 32, and inputs the detection result to the I / O 20. The detection result of the encoder 55 indicates the vertical position of the needle bar 63 and the sewing needle 65. The encoder 56 detects the rotation direction, rotation position, and rotation speed of the output shaft of the X motor 95, and inputs the detection result to the I / O 20. The detection result of the encoder 56 indicates the left-right position of the needle bar mechanism 6 and the hook mechanism 7. The encoder 57 detects the rotation direction, rotation position, and rotation speed of the output shaft of the Y motor 101, and inputs the detection result to the I / O 20. The detection result of the encoder 57 indicates the front-rear position of the holding mechanism 8. The encoder 58 detects the rotation direction, rotation position, and rotation speed of the output shaft of the middle presser motor 68, and inputs the detection result to the I / O 20. The detection result of the encoder 58 indicates the vertical position of the middle presser 64. The encoder 59 detects the rotation direction, rotation position, and rotation speed of the output shaft of the thread trimming motor 113, and inputs the detection result to the I / O 20. The detection result of the encoder 59 indicates the rotation position of the movable blade 112. The switch group 12 detects various instructions and inputs the detection results to the I / O 20.

The main process will be described with reference to FIGS. 6 to 9 with reference to Specific Examples 1 and 2. In the main process, after the sewing device 1 forms a stitch on the object W according to the sewing data, the thread trimming mechanism 110 cuts the needle thread M and the bobbin thread L, and the thread feeding mechanism 130 cuts the cut end edge of the needle thread M. This is a process of moving from the lower side to the upper side of the needle plate 74. The sewing device 1 controls the middle presser motor 68 to bring the middle presser 64 into contact position at the time of cutting the needle thread M and the bobbin thread L by the thread trimming mechanism 110 and at the time of thread feeding by the thread feeding mechanism 130. Located in. The main process is started when the operator operates the switch group 12 from the menu displayed on the display unit 13 to specify the start of the process. The CPU 16 reads a program for main processing from the ROM 17 into the RAM 18 and executes the main processing. The sewing data includes coordinate data that indicates the position of the needle drop point in the sewing area of the holding mechanism 8 for each stitch, and is stored in the storage device 19 in advance. The CPU 16 performs the processes of Specific Examples 1 and 2 at different times, but will be described in parallel below for the sake of simplicity. As shown in FIG. 7, the storage device 19 stores the times T1 to T5. In FIG. 7, the vertical position of the needle bar 63 with respect to the angle of the output shaft of the main motor 32, the rotational position of the movable blade 112, the vertical position of the middle presser 64, and the rotational position of the thread sweeping lever 136 are shown by thick lines. The angle of the output shaft of the main motor 32 is 0 degrees when the vertical position of the needle bar 63 is the top dead center.

The CPU 16 refers to the storage device 19 and acquires sewing data (S1). The CPU 16 sets the contact position (S2). The contact position may be set to a position different from the lower end position when the middle presser 64 moves up and down during sewing, or may be set to the same position as each other. The CPU 16 may set the input result of the switch group 12 to the contact position. The CPU 16 may automatically set the contact position according to the sewing conditions such as the thickness and material of the object to be sewn W or the conditions specified by the sewing data. The CPU 16 sets a position where the lower end of the middle presser 64 is slightly above the upper surface of the sewn object W at the lower end position of the moving range of the middle presser 64 at the time of sewing in Specific Examples 1 and 2. In the first embodiment shown in FIG. 8, the CPU 16 sets the contact position at a position one minute below the thickness D of the first mounting portion 22 from the position where the middle presser 64 comes into contact with the sewn object W. In the specific example 2 shown in FIG. 9, the CPU 16 is only the sum of the thickness D1 of the first mounting portion 22 and the height D2 of the counterbore 77 of the needle hole 75 from the position where the middle presser 64 contacts the sewn object W. Set the lower position to the contact position.

The CPU 16 sets the lowering time T1 for moving the middle presser 64 to the contact position with respect to the lowering of the needle bar 63 (S3). The CPU 16 may set the input result of the switch group 12 to the descending time T1. The CPU 16 may automatically set the descending machine T1 according to the sewing conditions such as the thickness and material of the object to be sewn W or the conditions specified by the sewing data. As shown in FIG. 7, the CPU 16 of the present embodiment sets the descending time T1 within the range R stored in the storage device 19. The CPU 16 represents the descending time T1 by the rotation angle of the main motor 32 and stores it in the storage device 19.

The CPU 16 determines whether or not the sewing start instruction has been detected (S4). The operator operates the switch group 12 to input a sewing start instruction. When the sewing start instruction is not detected (S4: NO), the CPU 16 waits in S4 until the sewing start instruction is detected. When the sewing start instruction is detected (S4: YES), the CPU 16 reads the coordinate data of the sewing data acquired in S2 in the sewing order, drives the transport mechanism 9, the feed mechanism 10, and the synchronization mechanism 31 according to the coordinate data, and holds the holding mechanism 8. The process of sewing in the sewing area of is started (S5).

The CPU 16 determines whether or not the next coordinate data is the coordinate data of the final needle (S6). The final needle is the last needle drop point in the sewing order. When the next coordinate data is not the coordinate data of the final needle (S6: NO), the CPU 16 waits in S6 until the coordinate data of the final needle is read, and continues sewing according to the sewing data acquired in S2. When the next coordinate data is the coordinate data of the final needle (S6: YES), the CPU 16 determines whether or not it is the descending time T1 set in S3 based on the detection result of the encoder 55 (S7). When it is not the descending time machine T1 set in S3 (S7: NO), the CPU 16 waits in S7 until the descending time machine T1 set in S3 is reached. When the descending time machine T1 set in S3 (S7: YES), the CPU 16 drives the middle presser motor 68 to lower the middle presser 64 to the contact position set in S2 (S8). According to S7 and S8, when the upper thread M and the lower thread L are cut by the thread trimming mechanism 110, the CPU 16 lowers the middle presser 64 to the contact position with respect to the lowering machine T1 set in S3 with respect to the lowering of the needle bar 63. As shown in FIG. 8, in the first embodiment, when the middle presser 64 is located at the contact position, the middle presser 64 presses the sewing material W toward the needle plate 74 side. The sewn object W at the portion pressed by the middle presser 64 is deformed, and the lower end of the sewn object W is lower than the upper end of the first mounting portion 22. As shown in FIG. 9, in the second embodiment, when the center presser 64 is located at the contact position, the lower end of the sewn object W is lower than the upper end of the needle plate 74. That is, a part of the lower end of the sewn object W is located in the needle hole 75.

The CPU 16 determines whether or not the thread trimming time is T2 based on the detection result of the encoder 55 (S9). When the thread trimming machine is not T2 (S9: NO), the CPU 16 waits in S9 until the thread trimming machine T2 is reached. When the thread trimming machine T2 (S9: YES), the CPU 16 drives the thread trimming motor 113 to move the movable blade 112 of the thread trimming mechanism 110 to the cutting position, and cuts the needle thread M and the bobbin thread L (S10). ). As shown in FIGS. 8 and 9, the thread trimming mechanism 110 cuts the needle thread M and the bobbin thread L at the position P. The CPU 16 maintains the middle presser 64 at the contact position when the needle bar 63 is raised by the needle bar mechanism 6 (S11). According to S11, the CPU 16 controls the middle presser motor 68 to position the middle presser 64 at the contact position when the upper thread M and the lower thread L are cut by the thread trimming mechanism 110, and then until the thread feeding by the thread feeding mechanism 130 is completed. The vertical position of the center presser 64 is maintained at the contact position.

The CPU 16 determines whether or not it is the thread feeding time T3 based on the detection result of the encoder 55 (S12). When it is not the thread-plucking machine T3 (S12: NO), the CPU 16 waits in S12 until the thread-plucking machine T3 is reached. At the time of threading machine T3 (S12: YES), the CPU 16 drives the air cylinder 131 to move the threading lever 136 of the threading mechanism 130, and presses the end of the needle thread M cut by the thread trimming mechanism 110 in the middle. Threading that moves above the cylinder of 64 is performed (S13). The CPU 16 drives the middle presser motor 68 by the ascending machine T4, and ascends the middle presser 64 up to the ascending position (S14). The CPU 16 stops driving the transport mechanism 9, the feed mechanism 10, and the synchronization mechanism 31 at the sewing end machine T5, and ends sewing (S15). The CPU 16 ends the main process.

In the above embodiment, the sewing device 1, the needle bar mechanism 6, the needle bar 63, the middle presser bar 64, the middle presser bar 69, the needle plate 74, the middle presser motor 68, the thread trimming mechanism 110, and the thread feeding mechanism 130 are of the present invention. It is an example of a sewing device, a needle bar mechanism, a needle bar, a middle presser, a middle presser bar, a needle plate, a drive source, a thread trimming mechanism, and a thread sweeping mechanism. The switch group 12 is an example of the input unit of the present invention. The CPU 16 that executes S2 is an example of the position setting unit of the present invention. The CPU 16 that executes S3 is an example of the time setting unit of the present invention. The CPU 16 that executes S8 and S11 is an example of the drive control unit of the present invention.

The sewing device 1 includes a needle bar 63, a needle bar mechanism 6, a middle presser bar 69, a needle plate 74, a thread trimming mechanism 110, a threading mechanism 130, a middle presser motor 68, and a CPU 16. The needle bar 63 extends in the vertical direction, and a sewing needle 65 can be attached to the lower end. The needle bar mechanism 6 moves the needle bar 63 up and down. The middle presser bar 69 has a middle presser bar 64 at the lower end and extends in the vertical direction in parallel with the needle bar 63. The needle plate 74 has a needle hole 75 through which the sewing needle 65 is inserted, and the sewn object W is placed on the needle plate 74. The thread trimming mechanism 110 cuts the needle thread M and the bobbin thread L below the needle plate 74. The thread feeding mechanism 130 performs thread feeding in which the end of the needle thread M cut by the thread trimming mechanism 110 is moved above the middle presser 64. The middle presser motor 68 moves the middle presser bar 69 up and down, and moves the middle presser 64 up and down between the contact position where the middle presser 64 comes into contact with the sewing material W and the separation position above the contact position. The CPU 16 controls the middle presser motor 68 to position the middle presser 64 at the contact position when the upper thread M and the bobbin thread L are cut by the thread trimming mechanism 110 and when the thread is fed by the thread feeding mechanism 130. (S8, S11). Since the sewing device 1 cuts the needle thread M and the bobbin thread L below the needle plate 74 by the thread trimming mechanism 110 in a state where the sewn object W is pressed by the middle presser 64, the needle thread M remaining on the back of the sewn object W The length of the bobbin thread L can be suppressed to be more stable and shorter than before.

When the upper thread M and the lower thread L are cut by the thread trimming mechanism 110, the CPU 16 of the sewing apparatus 1 controls the middle presser motor 68 to position the middle presser 64 at the contact position, and then until the thread feeding is completed by the thread feeding mechanism 130. , The vertical position of the middle presser 64 is maintained at the contact position (S8, S11). Therefore, the sewing apparatus 1 does not change the vertical position of the middle presser 64 between the time when the needle thread M and the bobbin thread L are cut by the thread trimming mechanism 110 and the time when the middle presser 64 is threaded by the thread feeding mechanism 130. , The process of moving the middle presser 64 can be easily performed.

When the CPU 16 of the sewing apparatus 1 is the final needle immediately before cutting the needle thread M and the bobbin thread L by the thread trimming mechanism 110 (S6: YES), the center presser 64 is pressed in synchronization with the lowering of the needle bar 63 by the needle bar mechanism 6. It descends to the contact position (S7: YES, S8) and maintains the center presser 64 at the contact position when the needle bar 63 is raised by the needle bar mechanism 6 (S11). Therefore, the sewing device 1 can easily move the center presser 64 in synchronization with the movement of the needle bar 63.

The CPU 16 of the sewing apparatus 1 sets the contact position of the middle presser 64 to a position different from the lower end position when the middle presser 64 moves up and down during sewing (S2). The CPU 16 controls the middle presser motor 68 to set the middle presser 64 in S2 when the upper thread M and the bobbin thread L are cut by the thread trimming mechanism 110 and when the thread is unwound by the thread unwinding mechanism 130. It is located at the contact position (S8, S11). Therefore, the sewing device 1 can adjust the lengths of the needle thread M and the bobbin thread L remaining on the back of the sewn object W by setting the contact position.

The CPU 16 of the sewing apparatus 1 sets the lowering time machine T1 for moving the middle presser 64 to the contact position with respect to the lowering of the needle bar 63 (S3). When the upper thread M and the lower thread L are cut by the thread trimming mechanism 110, the CPU 16 lowers the middle presser 64 to the contact position (S7: YES) at the lowering time T1 set by the CPU 16 with respect to the lowering of the needle bar 63 (S8). .. By setting the lowering machine T1 that moves the middle presser 64 to the contact position, the sewing device 1 can more reliably cut the needle thread M and the bobbin thread L by the thread trimming mechanism 110 when the middle presser 64 is located at the contact position. ..

The sewing device 1 includes a switch group 12, and the CPU 16 sets the input result of the switch group 12 to the contact position (S2). The sewing device 1 can set the contact position according to the input result input by the operator, and can improve the convenience of the operator.

The sewing device 1 includes a switch group 12, and the CPU 16 sets the input result of the switch group 12 to the descending time T1 for moving the middle presser 64 to the contact position (S3). The sewing device 1 can set the descending time T1 for moving the middle presser 64 to the contact position according to the input result input by the operator, and can improve the convenience of the operator. The sewing device 1 can set the descending machine T1 within the range R stored in the storage device 19.

The sewing apparatus of the present invention can be variously modified in addition to the above-described embodiment. The type of sewing machine 1 may be appropriately changed such as various industrial sewing machines and household sewing machines. The sewing device 1 may not be provided with the switch group 12, or may be replaced with the switch group 12 and provided with another input unit such as a touch panel.

The program including the command for executing the process of the sewing device 1 may be stored in the storage device of the sewing device 1 by the time the program is executed by the sewing device 1. Therefore, the acquisition method of the program, the acquisition route, and the device for storing the program may be changed as appropriate. For example, the program executed by the CPU 16 of the sewing device 1 may be received from another device via a cable or wireless communication and stored in a storage device such as a flash memory. Other devices include, for example, PCs and servers connected via a network.

A part or all of the processing executed by the sewing apparatus 1 may be executed by an electronic device (for example, ASIC) different from the CPU 16. The processing executed by the sewing device 1 may be distributed processing by a plurality of electronic devices (for example, a plurality of CPUs). Each step of the process executed by the sewing device 1 can be changed in order, omitted, and added as needed. The scope of the present invention also includes a mode in which an operating system (OS) or the like running on the sewing apparatus 1 performs a part or all of each process by a command of the CPU 16. For example, the following changes may be made to the above embodiment as appropriate.

The sewing device 1 may omit or change at least one of S2 and S3. The sewing device 1 moves the middle presser 64 to the contact position, cuts the needle thread M and the bobbin thread L by the thread trimming mechanism 110, moves the middle presser 64 from the contact position, and then moves the middle presser 64 to the contact position again. You may move to and perform thread sweeping by the thread sweeping mechanism 130. The contact position of the middle presser 64 when the needle thread M and the bobbin thread L are cut by the thread trimming mechanism 110 and the contact position of the middle presser 64 when thread feeding by the thread feeding mechanism 130 may be the same as each other. However, they may be different from each other. The sewing device 1 has either a contact position of the middle presser 64 when the needle thread M and the bobbin thread L are cut by the thread trimming mechanism 110 in S2, or a contact position of the middle presser 64 when thread is fed by the thread feeding mechanism 130. It may be set only or individually.

1: Sewing device 6: Needle bar mechanism 12: Switch group 16: CPU
19: Storage device 63: Needle bar 64: Middle presser 65: Sewing needle 68: Middle presser motor 69: Middle presser bar 110: Thread trimming mechanism 130: Thread feeding mechanism

Claims (7)

A needle bar that extends in the vertical direction and can be equipped with a sewing needle at the lower end,
A needle bar mechanism that moves the needle bar up and down,
A middle presser bar that has a middle presser at the lower end and extends in the vertical direction parallel to the needle bar.
A needle plate having a needle hole through which the sewing needle is inserted and on which a sewing object is placed,
A thread trimming mechanism that cuts the needle thread and bobbin thread below the needle plate,
In a sewing device including a thread sweeping mechanism that moves the end of the needle thread cut by the thread trimming mechanism to the upper side of the middle presser.
A drive source that moves the middle presser bar up and down and moves the middle presser up and down between the contact position where the middle presser comes into contact with the sewing material and the separation position above the contact position.
A drive in which the middle presser is positioned at the contact position by controlling the drive source at the time of cutting the upper thread and the lower thread by the thread trimming mechanism and at the time of performing the thread sweeping by the thread removing mechanism. A sewing device characterized by being provided with a control unit. When the upper thread and the lower thread are cut by the thread trimming mechanism, the drive control unit controls the drive source to position the middle presser at the contact position, and then until the thread feeding is completed by the thread feeding mechanism. The sewing device according to claim 1, wherein the vertical position of the middle presser is maintained at the contact position. At the time of the final needle immediately before the upper thread and the lower thread are cut by the thread trimming mechanism, the drive control unit lowers the middle presser to the contact position in synchronization with the lowering of the needle bar by the needle bar mechanism. The sewing device according to claim 2, wherein the middle presser is maintained at the contact position when the needle bar is raised by the needle bar mechanism. Further provided with a position setting unit for setting the contact position of the middle presser to a position different from the lower end position when the middle presser moves up and down during sewing.
The drive control unit controls the drive source to position the middle presser at the time of cutting the upper thread and the lower thread by the thread trimming mechanism and at the time of performing thread unwinding by the thread unwinding mechanism. The sewing device according to any one of claims 1 to 3, wherein the setting unit is located at the contact position set. Further, a timing setting unit for setting a timing for moving the middle presser to the contact position with respect to the descent of the needle bar is provided.
When the upper thread and the lower thread are cut by the thread trimming mechanism, the drive control unit lowers the middle presser to the contact position at the time set by the time setting unit with respect to the lowering of the needle bar. The sewing apparatus according to any one of claims 1 to 4. With more input
The sewing device according to claim 4, wherein the position setting unit sets the input result of the input unit to the contact position. With more input
The sewing device according to claim 5, wherein the time setting unit sets the input result of the input unit to the time when the middle presser is moved to the contact position.

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