JP2021159109A - Sewing device - Google Patents

Abstract

To provide a sewing device that improves convenience for an operator when sewing depending on a thickness of an object to be sewn.SOLUTION: A sewing device has a needle plate, a needle bar, a needle bar mechanism, a spindle motor, an outer presser bar, and a detector. An object to be sewn is placed on the needle plate. The needle bar vertically extends and a sewing needle can be mounted on a bottom edge of the needle bar. The needle bar mechanism moves up and down the needle bar. The spindle motor drives the needle bar mechanism. A presser foot can be mounted on a bottom edge of the presser bar. The presser bar presses the object to be sewn placed on the needle plate from above by the presser foot. The detector detects a detection thickness that is the thickness of the object to be sewn pressed by the presser foot. The sewing device obtains a reference thickness that is a thickness to be reference of one or more objects to be sewn (S62). The sewing device compares the detection thickness with the reference thickness (S63). The sewing device notifies a user of the comparison result (S77).SELECTED DRAWING: Figure 8

Description

The present invention relates to a sewing device.

The conventional sewing apparatus includes a presser foot that presses the cloth in the vicinity of the stitch forming position. The presser foot is attached to the lower end of the presser bar, and the presser foot can be moved between the ascending position where the presser foot releases the cloth and the presser position where the presser foot holds the cloth. When the presser foot moves, the distance between a part of the presser bar and the reference changes stably. The position sensor detects the position of the presser foot at the presser position. The sewing device sets the sewing conditions of the sewing device according to the cloth thickness, depending on the output value of the position sensor.

Japanese Unexamined Patent Publication No. 2007-007391

The sewing device automatically calculates the sewing conditions of the sewing device according to the cloth thickness and performs sewing. The sewing device automatically sets the sewing conditions according to the cloth thickness even when the worker sews an unintended cloth thickness of the sewn object. Therefore, the worker decides to sew the unintended cloth thickness of the sewn object. did not notice.

An object of the present invention is to provide a sewing apparatus having improved convenience for a worker when performing sewing according to the thickness of an object to be sewn.

The sewing apparatus according to claim 1 of the present invention includes a needle plate on which an object to be sewn is placed, a needle bar extending in the vertical direction and capable of attaching a sewing needle to the lower end, a needle bar mechanism for moving the needle bar up and down, and the above. A spindle motor that drives the needle bar mechanism, a presser foot that can be attached to the lower end and presses the sewn object placed on the needle plate from above with the presser foot, and the sewn object that the presser foot presses. In a sewing apparatus provided with a detection unit that detects a detection thickness that is the thickness of an object, an acquisition unit that acquires a reference thickness that is the thickness of one or a plurality of the sewn objects as a reference, and an acquisition unit that acquires the reference thickness, which is the thickness of the sewn object. A comparison unit that compares the detected thickness with the reference thickness, and a notification control unit that notifies the comparison result of the comparison unit are provided. The sewing device notifies the result of comparison between the detected thickness and the reference thickness. The operator can refer to the comparison result notified by the sewing device, place it on the needle plate according to the comparison result, and confirm whether or not the sewn object pressed by the presser foot is the sewn object intended by the operator. can. Therefore, the sewing device can improve the convenience of the operator when performing sewing according to the thickness of the object to be sewn.

The sewing apparatus according to claim 2 of the present invention further includes a warning threshold value acquisition unit that acquires a warning threshold value used for comparing the difference between the detection thickness and the reference thickness, and the notification control unit further includes the reference thickness and the detection. When the difference in thickness is equal to or greater than the warning threshold value, a warning is notified. By appropriately setting the warning threshold value, the sewing device can notify the operator that the sewn object having a thickness not intended by the operator is placed on the needle plate. By referring to the warning, the operator can avoid sewing on an object to be sewn, for example, which the operator does not intend.

The sewing device according to claim 3 of the present invention has a change threshold value acquisition unit that acquires a change threshold value smaller than the warning threshold value, and the difference between the reference thickness and the detection thickness is smaller than the warning threshold value and the change. When the value is equal to or higher than the threshold value, a condition changing unit for changing the sewing condition according to the detected thickness is further provided. By setting the warning threshold value and the change threshold value appropriately in the sewing device, the difference between the standard thickness and the detected thickness is not large enough to notify the warning, but in order to sew under the sewing conditions set according to the standard thickness. When it is not suitable, the sewing conditions can be changed automatically according to the detected thickness. The sewing device can save the operator the trouble of changing the sewing conditions during sewing.

The sewing device according to claim 4 of the present invention has an effective threshold value acquisition unit that acquires an effective threshold value smaller than the warning threshold value, and the difference between the reference thickness and the detection thickness is smaller than the warning threshold value and the detection is performed. When the value obtained by subtracting the reference thickness from the thickness is equal to or greater than the effective threshold value, the spindle motor is driven by an energization pattern different from that when sewing the sewing object having the reference thickness, so that the sewing needle is used. It is further provided with an effective setting unit for effectively setting a penetration force improving function for improving the penetration force of the object to be sewn. By setting the warning threshold value and the effective threshold value appropriately in the sewing device, the difference between the standard thickness and the detected thickness is not so large as to stop sewing, but when sewing is performed under the sewing conditions set according to the standard thickness. When it is difficult for the sewing needle to penetrate the object to be sewn, the penetration force improving function can be automatically set effectively. The sewing device can save the trouble of the operator effectively setting the penetrating force improving function during sewing.

The sewing device according to claim 5 of the present invention further includes a sewing stop portion for stopping the driving of the spindle motor when the difference between the reference thickness and the detected thickness acquired during driving of the spindle motor is equal to or greater than the warning threshold value. .. By appropriately setting the warning threshold value, the sewing device can prevent the operator from continuing to sew an object having an unintended thickness.

The detection unit of the sewing device according to claim 6 of the present invention detects the detected thickness before the start of driving the spindle motor, and the notification control unit detects the reference thickness and the detection before the start of driving the spindle motor. The result of the comparison of the detected thickness is notified. The operator can refer to the comparison result notified by the sewing device, the sewing device places it on the needle plate according to the comparison result, and sews whether the sewn object pressed by the presser foot is the sewn object intended by the operator. Can be confirmed before. Therefore, the sewing device can further improve the convenience of the operator when performing sewing according to the thickness of the object to be sewn.

The detection unit of the sewing device according to claim 7 of the present invention detects the detected thickness while driving the spindle motor, and the notification control unit changes the detected thickness detected while driving the spindle motor. Notify a warning in case. When the detected thickness changes while the spindle motor is being driven, the sewing device can notify the operator by notification. The operator can refer to the notification by the sewing device and take appropriate measures depending on whether or not the change in the detected thickness is intended by the operator.

The detection unit of the sewing device according to claim 8 of the present invention detects the detected thickness while driving the spindle motor, and when the detected thickness changes while driving the spindle motor, sets sewing conditions. Further, a condition changing unit that changes according to the detected thickness is provided. When the detected thickness changed while the spindle motor is being driven, the sewing device can automatically change the sewing conditions according to the detected thickness. The sewing device can save the operator the trouble of changing the sewing conditions during sewing.

The detection unit of the sewing device according to claim 9 of the present invention detects the detected thickness while driving the spindle motor, and the notification control unit detects the detected thickness while driving the spindle motor to a predetermined value. When it is smaller than, it notifies that the sewing material is not between the needle plate and the holding foot, and when the detected thickness detected while driving the spindle motor is smaller than the predetermined value, the spindle motor A sewing stop portion for stopping the driving of the sewing machine is further provided. The sewing device notifies that the object to be sewn is not between the needle plate and the presser foot, and can stop the drive of the spindle motor. The sewing device can prevent the spindle motor from being continuously driven after sewing to the end of the object to be sewn.

The sewing apparatus according to claim 10 of the present invention further includes a warning threshold value acquisition unit that acquires a warning threshold value used for comparing the difference between the detected thickness and the reference thickness, and the acquisition unit is said to be said during driving of the spindle motor. The reference thickness is acquired in a plurality of setting orders, and when the detection thickness detected during the driving of the spindle motor changes, the comparison unit compares the detection thickness with the reference thickness in which the setting order is next. The notification control unit notifies a warning when the difference between the detection thickness and the reference thickness next to the setting order is equal to or greater than the warning threshold value. When sewing an object to be sewn whose thickness changes during sewing, the sewing device can avoid detecting a portion where the thickness changes as an abnormality. When the sewing device detects a change in the detected thickness, the setting order compares the next reference thickness with the detected thickness, so even when sewing a sewn object whose thickness changes during sewing, the reference thickness and the detected thickness Can be compared properly.

The sewing apparatus according to claim 11 of the present invention further includes a storage unit that stores a plurality of combinations of the reference thickness and the setting order while the spindle motor is being driven, and the acquisition unit is a plurality of the storage units stored by the storage unit. The combinations are acquired in the order of setting. When sewing an object to be sewn whose thickness changes during sewing, the sewing device can avoid detecting a portion where the thickness changes as an abnormality. When the sewing device detects a change in the detected thickness, the setting order compares the next reference thickness with the detected thickness, so even when sewing a sewn object whose thickness changes during sewing, the reference thickness and the detected thickness Can be compared properly.

The sewing apparatus according to claim 12 of the present invention sets the detection thickness detected by the detection unit as the reference thickness, and stores a plurality of combinations of the reference thickness and the setting order in the storage unit. Further equipped with a part. The sewing device can store the combination of the reference thickness and the setting order in a plurality of storage units, using the detection thickness detected by the detection unit as the reference thickness. The sewing device can reduce the influence of the mounting tolerance of the detection unit on the sewing device as compared with the device that acquires the combination of the reference thickness and the setting order from other devices.

The perspective view of the sewing apparatus 1. FIG. 3 is a perspective view of a part of the internal structure of the sewing device 1. The front view of a part of the internal structure of a sewing apparatus 1. (A) is a left side view of a part of the internal structure of the sewing device 1 when the pressing mechanism 44 is in the position below the needle, and (B) is a left side view of a part of the internal structure of the sewing device 1 when the pressing mechanism 44 is in the position above the needle. Left side view of a part of the internal structure. The block diagram of the electrical structure of the sewing apparatus 1. Flow diagram of sewing process. Flow diagram of setting process. Flow chart of pre-sewing detection process. Flow chart of detection process during sewing. (A) is an explanatory view of the thickness of the sewn object W1 of the first specific example, and (B) is an explanatory view of the sewn object W2 of the second specific example.

The physical configuration of the sewing apparatus 1 of the present invention will be described. In the following description, the left and right, front and back, and top and bottom indicated by arrows in the figure are used. As shown in FIGS. 1 and 2, the sewing device 1 is a general feed sewing machine, and includes a bed portion 2, a pedestal portion 3, an arm portion 4, and a head portion 5. The bed portion 2 has a needle plate 14 on its upper surface, and houses a hook mechanism, a feed mechanism 36, and a feed amount adjusting mechanism 37. The hook mechanism is driven by the rotation of the lower shaft 40, and the upper thread and the lower thread are entangled below the needle plate 14. The lower shaft 40 rotates in synchronization with the main shaft 31 depending on the main shaft 31 and the belt 35 hung on the lower shaft 40. The feed mechanism 36 includes a vertical feed shaft 38, an eccentric link 69 (see FIG. 4), an eccentric rod (not shown), a converter 66, a horizontal feed shaft 39, a link mechanism 53, and a feed tooth 17, and the lower shaft 40 rotates. The feed dog 17 is driven in synchronization with the above, and the sewn object is moved in the transport direction by a predetermined feed amount. The transport direction is rearward or forward. The lower shaft 40, the vertical feed shaft 38, and the horizontal feed shaft 39 extend in the left-right direction. The vertical feed shaft 38 is in front of the horizontal feed shaft 39. The vertical feed shaft 38 is connected to the lower shaft 40 via an eccentric link 69 that is eccentric with respect to the axis of the lower shaft 40. The eccentric rod is provided eccentrically on the lower shaft 40 on the right side of the eccentric link 69. The converter 66 is connected to the rear end portion of the eccentric rod provided eccentrically on the lower shaft 40, and transmits the rotation of the lower shaft 40 due to the rotation of the main shaft 31 to the horizontal feed shaft 39. The left end of the vertical feed shaft 38 and the left end of the horizontal feed shaft 39 are connected to the feed dog 17 via the link mechanism 53. The feed amount adjusting mechanism 37 includes a feed amount adjusting motor 24, an intermediate shaft 28, a converter 66, a cam lever 67, a cam disc 65, and a horizontal feed shaft 39. The intermediate shaft 28 extends in the left-right direction and is connected to the horizontal feed shaft 39 via the transformant 66. The right end of the intermediate shaft 28 has a cam lever 67, and the cam lever 67 comes into contact with the cam disc 65 provided on the output shaft of the feed amount adjusting motor 24. The feed amount adjusting motor 24 is a pulse motor. The feed amount adjusting motor 24 changes the rotation amount of the horizontal feed shaft 39 via the cam disc 65, the cam lever 67, the intermediate shaft 28, and the converter 66 by rotating the output shaft, and is sewn by the feed mechanism 36. Adjust the amount of feed in the front-back direction of the object. When the lower shaft 40 rotates in synchronization with the rotation of the main shaft 31, the vertical feed shaft 38 and the horizontal feed shaft 39 swing, and the feed dog 17 draws an elliptical trajectory counterclockwise or clockwise when viewed from the left side. And rotate.

The pedestal portion 3 extends upward from the right end portion of the bed portion 2 and accommodates the spindle motor 21, the presser motor 22, the belt 35, and the drive link 41. The spindle motor 21 rotates the spindle 31. The presser foot motor 22 is a pulse motor provided on the left side and the rear side of the spindle motor 21, and adjusts the downward presser foot pressure applied to the object to be sewn by the outer presser foot 11 attached to the lower end of the outer presser bar 10. The presser foot motor 22 can also move the outer presser foot 11 up and down. The drive link 41 is connected to the horizontal feed shaft 39 and the needle bar swing shaft 42.

The arm portion 4 extends to the left from the upper end portion of the pedestal portion 3. The arm unit 4 is provided with a display unit 15, input units 16 and 19, and a thread tensioner 13 on the front surface thereof. The display unit 15 is a liquid crystal display for displaying an image, and the input unit 16 is a touch panel provided on the front surface of the display unit 15, and various instructions can be input to the control unit 90. The input unit 19 is provided on the right side of the display unit 15 and is a switch for inputting various instructions to the control unit 90. The thread tensioner 13 has a thread tension solenoid 25 (see FIG. 5), and applies a predetermined tension to the needle thread by driving the thread tension solenoid 25. The arm portion 4 accommodates a thread tension solenoid 25, an alternating rise amount adjusting motor 23, a spindle 31, a holding shaft 26, a needle bar swing shaft 42, an intermediate shaft 27, a swing shaft 45, and an alternate rise amount adjusting mechanism 50. The thread tension solenoid 25 is a proportional solenoid, and the sewing device 1 can adjust the tension applied to the needle thread by adjusting the drive voltage supplied to the thread tension solenoid 25. The alternating ascending amount adjusting motor 23 is a pulse motor provided on the left side of the spindle motor 21 and the presser motor 22. The spindle 31, the presser foot 26, the needle bar swing shaft 42, the intermediate shaft 27, and the swing shaft 45 extend in the left-right direction. The right end of the spindle 31 is connected to the spindle motor 21, and the left end is connected to the needle bar mechanism 32. The presser shaft 26 is located behind the main shaft 31 and has a fan-shaped gear 64 at the right end. The fan-shaped gear 64 meshes with a pinion 61 provided on the output shaft of the presser motor 22, and rotates depending on the drive of the presser motor 22. Therefore, the presser foot 26 rotates depending on the drive of the presser motor 22. The left end of the presser shaft 26 is connected to the presser mechanism 44. The right end of the needle bar swing shaft 42 is connected to the drive link 41, and the left end is connected to the swing mechanism 34. The alternating ascending amount adjusting mechanism 50 includes an alternating ascending amount adjusting motor 23, a cam mechanism 62, an intermediate shaft 27, a converter 63, and a swing shaft 45. The output shaft of the alternating ascending amount adjusting motor 23 is connected to the intermediate shaft 27 via the cam mechanism 62. The intermediate shaft 27 is connected to the swing shaft 45 via the converter 63. By rotating the output shaft, the alternating rise amount adjusting motor 23 changes the swing amount of the swing shaft 45 via the cam mechanism 62, the intermediate shaft 27, and the converter 63, and adjusts the alternate rise amount. The amount of alternating ascent is the amount of ascent from the needle plate 14 when the middle presser bar 8 and the outer presser bar 10 alternately move up and down in synchronization with the rotation of the spindle 31.

The head portion 5 is provided at the left end of the arm portion 4, and a balance 12 is provided in front of the head portion 5. The balance 12 pulls up the needle thread and ties a knot with the bobbin thread. The head 5 accommodates the needle bar mechanism 32, the balance mechanism 33, the pressing mechanism 44, the swing mechanism 34, and the detector 49. The needle bar mechanism 32 is connected to the main shaft 31 and moves the needle bar 6 up and down. The balance mechanism 33 moves the balance 12 up and down in synchronization with the rotation of the main shaft 31.

The presser mechanism 44 is connected to the left end of the presser shaft 26, and has an outer presser rod 10, a middle presser rod 8, a swing shaft 45, links 46, 47, 70, a triangular lever 48, an urging member 51, an adjusting member 52, and a conversion. It includes a body 63 and an eccentric rod 68. The outer presser bar 10 extends up and down, and the outer presser foot 11 can be attached to and detached from the lower end thereof. The middle presser bar 8 extends up and down in front of the outer presser bar 10. The middle presser foot 9 can be attached to and detached from the lower end of the middle presser bar 8. The left end of the swing shaft 45 is connected to a link 46 extending in the vertical direction. The lower end of the link 46 is connected to the rear end of the link 47 extending in the front-rear direction. The triangular lever 48 has a left-side view triangular plate shape, and one of the three corners is connected to the front end of the link 47. Of the three corners of the triangular lever 48, the remaining two are connected to the outer holding rod 10 and the link 70. One end of the link 70 is connected to the triangular lever 48, and the other end is connected to the middle holding rod 8. The urging member 51 is a coil-shaped compression spring, which is externally inserted into the outer pressing rod 10 and presses the outer pressing rod 10 downward. The adjusting member 52 has a cylindrical shape, and the urging member 51 is inserted inside the adjusting member 52 so that the adjusting member 52 can move up and down. The adjusting member 52 moves up and down depending on the drive of the pressing motor 22, and adjusts the downward pressing pressure applied by the urging member 51 to the outer pressing rod 10. The converter 63 is connected to the rear end portion of the eccentric rod 68 provided eccentrically to the spindle 31, transmits the rotation of the spindle 31 due to the drive of the spindle motor 21 to the swing shaft 45, and swings the swing shaft 45. do. When the swing shaft 45 swings due to the rotation of the main shaft 31, the link 46 swings around the swing shaft 45. As the link 46 swings, the link 47 operates in the front-rear direction, and the outer pressing rod 10 and the middle pressing rod 8 are operated in the vertical direction via the triangular lever 48. As shown in FIG. 4A, when the link 47 moves forward, the outer presser bar 10 rises and the middle presser bar 8 descends. As shown in FIG. 4B, when the link 47 moves rearward, the outer pressing rod 10 is lowered and the middle pressing rod 8 is raised. The presser mechanism 44 moves the outer presser bar 10 and the middle presser bar 8 up and down in opposite phases, that is, alternately, in synchronization with the rotation of the main shaft 31, and the outer presser foot 11 and the middle presser foot 9 alternately move the sewn object upward. Press toward the needle plate 14.

The swing mechanism 34 is connected to the needle bar swing shaft 42, and in synchronization with the rotation of the spindle 31, the needle bar 6 and the center presser bar 8 are sewn in an amount corresponding to the swing amount of the needle bar swing shaft 42. It swings in the direction of transporting objects. As shown in FIG. 4A, the lower end of the sewing needle 7 is below the needle plate 14, the outer presser foot 11 is located above the needle plate 14, and the middle presser foot 9 is close to the feed dog 17. The state of being in the position is said to be the state in which the pressing mechanism 44 is in the position below the needle. While the presser mechanism 44 is in the position below the needle, the sewing device 1 swings the needle bar 6, the middle presser bar 8, and the feed dog 17 rearward while the sewing needle 7 is stuck in the object to be sewn. As shown in FIG. 4B, the lower end of the sewing needle 7 is above the needle plate 14, the outer presser foot 11 is located close to the needle plate 14, and the middle presser foot 9 is separated above the needle plate 14. The state of being in the position is said to be that the pressing mechanism 44 is in the position on the needle. While the presser mechanism 44 is in the position above the needle, the sewing device 1 swings the needle bar 6, the middle presser bar 8, and the feed dog 17 forward in a state where the sewing needle 7 is not stuck in the object to be sewn.

The detector 49 outputs a detection result according to the thickness of the sewn object to the control unit 90. The detector 49 is, for example, a magnetic sensor provided on the head 5, and detects the vertical position of the magnetic body 71 provided on the presser bar hugging 60 that supports the outer presser bar 10 so as to be movable up and down. The sewing device 1 includes a needle bar 6, an outer presser bar 10, and a middle presser bar 8 that move up and down by driving the spindle motor 21 at the lower part of the head 5. The needle bar 6 extends up and down in front of the center presser bar 8, and the sewing needle 7 can be attached to and detached from the lower end thereof. The thread piece supplies the needle thread to the eye hole of the sewing needle 7.

The electrical configuration of the sewing device 1 will be described with reference to FIG. The control unit 90 of the sewing device 1 includes a CPU 91, a ROM 92, a RAM 93, a storage device 94, an input / output interface (I / O) 95, drive circuits 81 to 86, and the like. The CPU 91 controls the operation of the sewing device 1 in an integrated manner. The ROM 92 stores in advance a program or the like for executing various processes. The RAM 93 temporarily stores various information generated during execution of various processes. The storage device 94 is non-volatile and stores various set values. The storage device 94 stores the number table 96, the setting table 97, and the threshold table 98. The number table 96 stores the correspondence between the reference thickness and the number of sheets and the feed amount, the thread tension, the pressing pressure, the alternating ascending amount, and the rotation speed. The standard thickness is the reference thickness of the sewn product that has been piled up several times, which is indicated by the number of sheets. The feed amount is the amount that the feed mechanism 36 conveys the sewn object during the period in which the spindle 31 makes one rotation, and is adjusted by driving the feed amount adjusting motor 24. The thread tension is an amount indicating the tension applied to the needle thread, and is adjusted by driving the thread tension solenoid 25. The presser foot pressure is an amount corresponding to the downward pressure applied to the object to be sewn by the outer presser foot 11 attached to the lower end of the outer presser bar 10, and is adjusted by driving the presser motor 22. The alternating ascending amount is an amount according to the height from the needle plate 14 when the pressing mechanism 44 alternately moves the outer pressing rod 10 and the middle pressing rod 8 up and down, and is adjusted by driving the alternating ascending amount adjusting motor 23. .. The rotation speed is the rotation speed of the output shaft of the spindle motor 21. The setting table 97 stores the correspondence between the setting order and the reference thickness. The setting order corresponds to the order in which the sewn object of the standard thickness is sewn. The threshold table 98 stores various thresholds. The tables 96 to 98 may be stored in the peripheral device connected to the sewing device 1, another sewing device 1, and the cloud. The tables 96 to 98 may be viewed, changed, and set by using a sewing device 1, a PC connected to the sewing device 1, a smartphone, or the like.

Each drive circuit 81-86 is connected to I / O 95. The drive circuit 81 is connected to the spindle motor 21 and drives the spindle motor 21 by a control command of the CPU 91. The drive circuit 82 is connected to the feed amount adjusting motor 24, and drives the feed amount adjusting motor 24 by a control command of the CPU 91. The drive circuit 83 is connected to the alternating ascending amount adjusting motor 23, and drives the alternating ascending amount adjusting motor 23 by a control command of the CPU 91. The drive circuit 84 is connected to the presser motor 22 and drives the presser motor 22 by a control command of the CPU 91. The drive circuit 85 is connected to the thread tension solenoid 25, and drives the thread tension solenoid 25 by a control command of the CPU 91. The drive circuit 86 is connected to the display unit 15 and drives the display unit 15 by a control command of the CPU 91.

The encoders 56 to 59, the input units 16 and 19, the pedal 18, and the detector 49 are connected to the I / O 95. The encoder 56 detects the rotation position and rotation speed of the spindle 31 connected to the output shaft of the spindle motor 21, and inputs the detection result to the I / O 95. The encoder 57 detects the rotation position and rotation speed of the output shaft of the feed amount adjusting motor 24, and inputs the detection result to the I / O 95. The encoder 58 detects the rotation position and rotation speed of the output shaft of the alternating ascending amount adjusting motor 23, and inputs the detection result to the I / O 95. The encoder 59 detects the rotation position and rotation speed of the output shaft of the presser motor 22, and inputs the detection result to the I / O 95. The input units 16 and 19 detect various instructions and input the detection results to the I / O 95. The pedal 18 detects the operation direction and the operation amount of the pedal 18, and inputs the detection result to the I / O 95. The detector 49 inputs the detection result according to the thickness of the sewn object to the I / O 95.

The sewing process will be described with reference to FIGS. 6 to 10 with reference to two specific examples shown in FIGS. 10 (A) and 10 (B). The CPU 91 compares the detection result of the detector 49 with the reference thickness stored in the storage device 94 in the sewing process, and performs the process according to the comparison result. The first specific example of FIG. 10A is an example in which the number of sewn objects W1 changes in order from two to three or four during sewing. When the CPU 91 detects a change in the detected thickness during sewing in the sewing process of the first specific example, the CPU 91 reads out the next reference thickness in the setting order among the reference thicknesses stored in the setting table 97, and the detection thickness and the reference. Perform a process to compare with the thickness. The detected thickness is the thickness of the sewn object pressed by the outer pressing foot 11 detected by the detector 49. The second specific example of FIG. 10B is an example in which the number of sewn objects W2 does not change during sewing, but the thickness of the sewn objects W2 changes. In the sewing process of the second specific example, the CPU 91 executes a process of comparing the detected thickness with the reference thickness by using the detected thickness or the reference thickness according to the sewing condition being set. The sewing process is started when the power of the sewing device 1 is turned on. The CPU 91 reads the sewing processing program from the ROM 92 into the RAM 93 and executes the sewing processing. The sewing processes of the two specific examples are performed at different times, but for the sake of simplicity, the sewing processes of the two specific examples will be described in parallel.

As shown in FIG. 6, the CPU 91 performs an initialization process (S1). The CPU 91 determines whether or not the sewing instruction has been detected based on the detection result of the input unit 16 (S2). When sewing is performed by the sewing device 1, the operator operates the input unit 16 to input a sewing instruction. When the sewing instruction is not detected (S2: NO), the CPU 91 determines whether or not the setting instruction has been detected based on the detection result of the input unit 16 (S5). When setting at least one of the setting of the number table 96, the setting of the setting table 97, and the setting of the threshold table 98, the operator operates the input unit 16 to input the setting instruction. When the setting instruction is not detected (S5: NO), the CPU 91 performs S14. When the setting instruction is detected (S5: YES), the CPU 91 performs the setting process (S6). The CPU 91 sets the number table 96, the setting table 97, and the threshold table 98 according to the instruction of the operator in the setting process. The operator operates the input unit 16 to input an instruction to set the number table 96, the setting table 97, or the threshold table 98.

As shown in FIG. 7, in the setting process, the CPU 91 determines whether or not the instruction to set the number table 96 is detected based on the detection result of the input unit 16 (S21). The thickness of the sewn object detected by the detector 49 increases as the number of sewn objects to be overlapped increases. For example, when the operator wants to store in the number table 96 the correspondence between the thickness of the sewn object detected by the detector 49 and the number of superposed sheets of the sewn object, he / she inputs an instruction to set the number table 96. When the instruction to set the number table 96 is detected (S21: YES), the CPU 91 determines whether or not the pressing mechanism 44 is in the needle position based on the detection result of the input unit 16 (S22). When the pressing mechanism 44 is in the position above the needle, the outer pressing rod 10 to which the outer pressing foot 11 is attached is in the descending position close to the needle plate 14. The operator places one or a predetermined number of sewn objects to be sewn on the needle plate 14, arranges the presser mechanism 44 at the needle upper position, and operates the input unit 16 to place the presser mechanism 44 at the needle upper position. Input a signal indicating that it is placed in. The CPU 91 continues the determination of S22 until it detects that the pressing mechanism 44 is in the position on the needle (S22: NO). When it is detected that the pressing mechanism 44 is in the position on the needle (S22: YES), the CPU 91 sets the detection thickness, which is the detection result of the detector 49, to the reference thickness (S23). The CPU 91 acquires the number of sewn objects designated by the operator based on the detection result of the input unit 16 (S24). The CPU 91 associates the reference thickness set in S23 with the number of sheets acquired in S24 and stores them in the number table 96 (S25). Since the detected thickness detected in S23 changes depending on the setting of the sewing device 1 at the time of detection, the CPU 91 may store the setting of the sewing device 1 at the time of detection in association with the reference thickness and the number of sheets. The CPU 91 determines whether or not it has detected an instruction to end the setting of the number table 96 based on the detection result of the input unit 16 (S26). When the instruction to end the setting of the number table 96 is not detected (S26: NO), the CPU 91 returns the process to S22. When the instruction to end the setting of the number table 96 is detected (S26: YES), the CPU 91 performs the process of S48.

When the instruction to set the number table 96 is not detected (S21: NO), the CPU 91 determines whether or not the instruction to set the setting table 97 is detected based on the detection result of the input unit 16 (S31). An instruction to set the setting table 97 by operating the input unit 16 when, for example, the operator intends to sew a sewn object in which the number of sewn objects changes or the thickness of the sewn object changes during sewing. Enter. When the instruction to set the setting table 97 is detected (S31: YES), the CPU 91 sets 0 in the variable N indicating the setting order (S32). The CPU 91 updates the variable N by adding one (S33). Similar to S22, the CPU 91 determines whether or not the pressing mechanism 44 is in the needle position (S34), and continues the determination in S34 until it detects that the pressing mechanism 44 is in the needle position (S34:). NO). When it is detected that the pressing mechanism 44 is in the position on the needle (S34: YES), the CPU 91 sets the detection thickness, which is the detection result of the detector 49, to the reference thickness (S35). The CPU 91 sets the variable N in the setting order, and stores the correspondence between the setting order and the reference thickness set in S35 in the setting table 97 (S36). The CPU 91 determines whether or not it has detected an instruction to end the setting of the setting table 97 based on the detection result of the input unit 16 (S37). When the instruction to end the setting of the setting table 97 is not detected (S37: NO), the CPU 91 returns the process to S33. When the instruction to end the setting of the setting table 97 is detected (S37: YES), the CPU 91 performs the process of S48.

When the instruction to set the setting table 97 is not detected (S31: NO), the CPU 91 determines whether or not the instruction to set the threshold table 98 is detected based on the detection result of the input unit 16 (S41). When the instruction to set the threshold table 98 is not detected (S41: NO), the CPU 91 performs S48. When the instruction to set the threshold value table 98 is detected (S41: YES), the CPU 91 determines whether or not the instruction to set the warning threshold value is detected based on the detection result of the input unit 16 (S42). The warning threshold value is used in a process of determining whether or not to notify a warning according to the comparison result between the thickness of the sewn object detected by the detector 49 before the start of sewing or during sewing and the reference thickness. When the instruction to set the warning threshold value is detected (S42: YES), the CPU 91 sets the warning threshold value according to the detection result of the input unit 16 and stores the warning threshold value in the threshold value table 98 (S43). When the instruction to set the warning threshold value is not detected (S42: NO), or next to S43, the CPU 91 determines whether or not the instruction to set the change threshold value is detected based on the detection result of the input unit 16 (S44). ). The change threshold value is used in a process of determining whether or not to change the sewing conditions according to the comparison result between the thickness of the sewn object detected by the detector 49 before the start of sewing or during sewing and the reference thickness. When the instruction to set the change threshold value is detected (S44: YES), the CPU 91 sets the change threshold value according to the detection result of the input unit 16 and stores the change threshold value in the threshold value table 98 (S45).

When the instruction to set the change threshold value is not detected (S44: NO), or next to S45, the CPU 91 determines whether or not the instruction to set the effective threshold value is detected based on the detection result of the input unit 16 (S46). ). The effective threshold value is used in the process of determining whether or not the penetration force improving function is effectively set according to the comparison result between the thickness of the sewn object detected by the detector 49 before the start of sewing or during sewing and the reference thickness. .. The CPU 91 of this example improves the penetrating force of the sewn object by the sewing needle 7 by driving the spindle motor 21 with a specific energization pattern different from that when sewing the sewn object having the reference thickness. A known energization pattern may be appropriately adopted as the specific energization pattern. For example, when the sewing needle 7 stops, a current larger than the current energizing the spindle motor 21 when the rotation speed of the spindle motor 21 is higher than a predetermined rotation speed is applied. It may include energization for a period longer than the period from the start of energization to the spindle motor 21 to the time when the advance starts, and energization cutoff in which the supply of the current for a predetermined time is cut off after the energization. The specific energization pattern may be one in which the rotation direction of the spindle motor 21 is reversed in a predetermined cycle, for example, within a range in which the sewing needle 7 does not reach the top dead center or bottom dead center in which the movement direction is reversed.

When the instruction to set the effective threshold value is detected (S46: YES), the CPU 91 sets the effective threshold value according to the detection result of the input unit 16 and stores it in the threshold value table 98 (S47). When the instruction to set the effective threshold value is not detected (S46: NO), or next to S47, the CPU 91 determines whether or not the instruction to end the setting process is detected based on the detection result of the input unit 16 (S48). When the instruction to end the setting process is not detected (S48: NO), the CPU 91 returns the process to S21. When the instruction to end the setting process is detected (S48: YES), the CPU 91 ends the setting process and returns the process to the sewing process of FIG.

When the setting instruction is not detected (S5: NO), or after S6, the CPU 91 performs the process of S14. When the sewing instruction is detected (S2: YES), the CPU 91 determines whether or not the presser mechanism 44 is in the needle position (S3) as in S22, and detects that the presser mechanism 44 is in the needle position. The judgment of S3 is continued until (S3: NO). When it is detected that the pressing mechanism 44 is in the position on the needle (S3: YES), the CPU 91 performs the pre-sewing detection process (S4). The CPU 91 performs pre-sewing detection processing according to a comparison result between the detection thickness of the sewn object based on the detection result of the detector 49 before the start of sewing and the reference thickness stored in the storage device 94.

As shown in FIG. 8, the CPU 91 detects the detection result of the detector 49 as the detection thickness and stores it in the RAM 93 (S51). The CPU 91 detects the detection thickness T11 for the sewn object W1 of the first specific example and stores it in the RAM 93. The CPU 91 detects the detection thickness T21 for the sewn object W2 of the second specific example and stores it in the RAM 93. The CPU 91 acquires the reference thickness (S62). In the first specific example, the CPU 91 acquires the reference thickness T2 in the setting order of 1. In the second specific example, the CPU 91 acquires the reference thickness T2 when the number of sheets closest to the detection thickness T21 detected in S51 is two among the reference thicknesses stored in the number table 96. The CPU 91 compares the detected thickness acquired in S51 with the reference thickness acquired in S62 (S63). The method of comparing the detected thickness and the reference thickness may be appropriately set. The CPU 91 of this example calculates the difference obtained by subtracting the reference thickness acquired in S62 from the detection thickness acquired in S51. The CPU 91 may, for example, compare the detected thickness with the reference thickness and calculate the number of sewn objects placed on the needle plate 14. For example, the CPU 91 subtracts the detected thickness when the needle plate 14 comes into contact with the outer presser foot 11 from the detected thickness when the sewn object placed on the needle plate 14 is pressed by the outer presser foot 11. It may be calculated as the thickness of. The CPU 91 refers to the threshold table 98 and acquires the warning threshold H1 (S64). The CPU 91 may acquire the warning threshold value H1 stored in the threshold value table 98 of the storage device 94, may acquire the warning threshold value H1 input by the operator depending on the detection result of the input unit 16, or may acquire the warning threshold value H1 input by the operator, or another device. The warning threshold value H1 may be acquired from (for example, another sewing device). The CPU 91 determines whether or not the absolute value of the difference calculated in S63 is equal to or greater than the warning threshold value H1 acquired in S64 (S65). When the absolute value of the difference is equal to or greater than the warning threshold value H1 (S65: YES), the CPU 91 notifies the warning (S66). For example, the CPU 91 displays an error message "cloth thickness abnormality warning" on the display unit 15. The CPU 91 stores in the RAM 93 a sewing non-sewing setting that does not allow the start of sewing (S67).

When the absolute value of the difference is not equal to or higher than the warning threshold value H1 (S65: NO), the CPU 91 refers to the threshold value table 98 and acquires the change threshold value H2 (S71). Similar to S64, the acquisition method of the change threshold value H2 may be appropriately changed. The change threshold value H2 in this example is a value smaller than the warning threshold value H1. The CPU 91 determines whether or not the absolute value of the difference calculated in S63 is equal to or greater than the change threshold value H2 acquired in S71 (S72). When the absolute value of the difference is equal to or greater than the change threshold value H2 (S72: YES), the CPU 91 refers to the number table 96 and sets sewing conditions according to the detection thickness detected in S51 (S73). The CPU 91 of this example sets the feed amount, thread tension, pressing pressure, alternating rise amount, and rotation speed as sewing conditions according to the detection thickness. When the absolute value of the difference is not equal to or greater than the change threshold value (S72: NO), or next to S73, the CPU 91 refers to the threshold value table 98 and acquires the effective threshold value H3 (S74). Similar to S64, the method of acquiring the effective threshold value H3 may be appropriately changed. The effective threshold value H3 of this example is a value smaller than the warning threshold value H1. The effective threshold value H3 may be the same as the change threshold value H2, or may be different from each other.

The CPU 91 determines whether or not the difference calculated in S63 is equal to or greater than the effective threshold value H3 acquired in S71 (S75). When the difference is equal to or greater than the effective threshold value H3 (S75: YES), the CPU 91 effectively sets the penetration force improving function (S76). When the difference is not equal to or higher than the effective threshold value H3 (S75: NO), or next to S76, the CPU 91 notifies the comparison result of the detected thickness and the reference thickness in S63 (S77). For example, the CPU 91 may display the number of sewn objects placed on the needle plate 14 on the display unit 15, the difference calculated in S63 may be displayed on the display unit 15, or the thickness of the sewn object. The result may be displayed on the display unit 15. When the sewing condition is changed in S73, the CPU 91 may notify the changed sewing condition. The CPU 91 may notify the setting status of the penetrating force improving function. Since the detected thickness detected in S51 changes depending on the setting of the sewing device 1 at the time of detection such as the pressing pressure, the feed dog 17, the position of the outer pressing foot 11, etc., the comparison content may be displayed together with the setting at the time of detection. .. The CPU 91 may indicate the difference between the detected thickness and the reference thickness by a numerical value, a ratio, or the like, or may display the detected thickness and the reference thickness together. The CPU 91 may display the comparison result in characters or may be illustrated. The CPU 91 stores in the RAM 93 a sewing permission setting that permits the start of sewing. Next to S67 or S78, the CPU 91 ends the pre-sewing detection process and returns the process to the sewing process of FIG.

Next to S4, the CPU 91 refers to the RAM 93 and determines whether or not the sewing permission setting is stored in the RAM 93 (S7). When the RAM 93 stores the sewing non-sewing setting (S7: NO), the CPU 91 performs the process of S14. When the RAM 93 stores the sewing permission setting (S7: YES), the CPU 91 determines whether or not the sewing start instruction has been detected (S8). At the start of sewing, the operator depresses the pedal 18, and the pedal 18 inputs the sewing start instruction to the control unit 90. When the sewing start instruction is not detected (S8: NO), the CPU 91 determines whether or not the stop instruction for stopping the sewing process is detected based on the detection result of the input unit 16 (S15). In consideration of the notification result in S77, for example, the operator operates the input unit 16 to input a stop instruction when rearranging the sewn object. When the stop instruction is not detected (S15: NO), the CPU 91 returns the process to S8. When the stop instruction is detected (S15: YES), the CPU 91 performs the process of S14.

When the CPU 91 detects the sewing start instruction (S8: YES), the CPU 91 starts sewing under the sewing conditions according to the detected thickness (S9). The CPU 91 refers to the number table 96 in the first and second specific examples, and acquires the sewing conditions corresponding to the reference thickness T2. When the sewing condition is changed in S4, the CPU 91 acquires the changed sewing condition. The CPU 91 drives the thread tension solenoid 25 according to the sewing conditions to adjust the thread tension. The CPU 91 drives the feed amount adjusting motor 24 according to the sewing conditions to adjust the feed amount. The CPU 91 drives the alternating ascending amount adjusting motor 23 according to the sewing conditions to adjust the alternating ascending amount. The CPU 91 drives the presser foot motor 22 according to the sewing conditions to adjust the presser foot pressure. The CPU 91 drives the spindle motor 21 according to the sewing conditions, adjusts the rotation speed, and controls the energization pattern of the spindle motor 21 when the penetration force improving function is effective.

The CPU 91 determines whether or not the sewing stop instruction has been detected (S10). When the sewing is stopped, the operator releases the depression of the pedal 18, and the pedal 18 inputs the sewing stop instruction to the control unit 90. The CPU 91 also detects the sewing stop instruction even when the RAM 93 stores the sewing stop setting. When the CPU 91 detects the sewing stop instruction (S10: YES), the CPU 91 stops driving the thread tension solenoid 25 and the spindle motor 21, and stops sewing under sewing conditions according to the detected thickness (S11). When the sewing stop instruction is not detected (S10: NO), the CPU 91 determines whether or not it is the detection time based on the detection result of the encoder 56 (S12). The CPU 91 of this example executes the sewing detection process with the detection time when the rotation angle of the spindle 31 is a predetermined angle. The predetermined angle is, for example, the angle when the pressing mechanism 44 is in the position on the needle. When it is not the detection time (S12: NO), the CPU 91 returns the process to S10. When it is the detection time (S12: YES), the CPU 91 performs the sewing detection process (S13). In the sewing detection process, the CPU 91 performs processing according to a comparison result between the detection thickness of the sewn object based on the detection result of the detector 49 during sewing and the reference thickness stored in the storage device 94.

In the sewing detection process of FIG. 9, the same step number is assigned to the same process as the pre-sew detection process of FIG. 8, and the description is omitted or simplified. The CPU 91 detects the detection result of the detector 49 as the detection thickness (S51). The CPU 91 refers to the threshold table 98 of the storage device 94 and acquires the thickness threshold (S52). The thickness threshold value is a threshold value for detecting that there is no sewn object between the needle plate 14 and the outer presser foot 11, and is set in consideration of the detection accuracy of the detector 49 and the like. The CPU 91 determines whether or not the detected thickness detected in S51 is equal to or greater than the thickness threshold value (S53). When the detected thickness is not equal to or greater than the thickness threshold value (S53: NO), the CPU 91 notifies that the thickness of the sewn object is 0 (S54). The CPU 91 displays, for example, an error message "There is no sewn object between the needle plate and the outer presser foot" on the display unit 15. The CPU 91 stores the sewing stop setting in the RAM 93 (S55), ends the sewing detection process, and returns the process to the sewing process of FIG.

When the detected thickness is equal to or greater than the thickness threshold value (S53: YES), the CPU 91 determines whether or not the detected thickness has changed (S56). The CPU 91 has, for example, the absolute value of the difference between the detection thickness detected in the previous sewing detection process or the pre-sewing detection process and stored in the RAM 93 and the detection thickness detected in the current sewing detection process and stored in the RAM 93. When the value is equal to or greater than the change threshold value stored in the threshold value table 98, it is determined that the detected thickness has changed. The change threshold value may be appropriately set in consideration of the detection accuracy of the detector 49 and the like, and is a value smaller than, for example, the warning threshold value H1, the change threshold value H2, and the effective threshold value H3.

When the CPU 91 acquires the detection thickness T12 in the first specific example (S51, S53: YES), the CPU 91 determines that the detection thickness has changed (S56: YES), and notifies a warning (S57). The CPU 91 displays, for example, the message "cloth thickness change detection" on the display unit 15. The CPU 91 refers to the setting table 97 and determines whether the next setting order is stored in the setting table 97 (S58). The CPU 91 determines in the first specific example that the following setting order is stored (S58: YES), sets the sewing conditions, sets the sewing conditions corresponding to the following 2 (S59), and sets the sewing conditions in the order of 2. Acquire the corresponding reference thickness T3 (S60). The CPU 91 compares the detected thickness T12 detected in S51 with the reference thickness T3 acquired in S60, and calculates the difference between the detected thickness T12 and the reference thickness T3 (S63). The CPU 91 refers to the threshold table 98, acquires the warning threshold H1 (S64), and determines that the absolute value of the difference calculated in S63 is not equal to or higher than the warning threshold H1 (S65: NO). The CPU 91 refers to the threshold table 98, acquires the change threshold H2 (S71), and determines that the absolute value of the difference calculated in S63 is not equal to or greater than the change threshold H2 (S72: NO). The CPU 91 refers to the threshold table 98, acquires the effective threshold H3 (S74), and determines that the difference calculated in S63 is not equal to or greater than the effective threshold H3 (S75: NO). The CPU 91 notifies the comparison result of S63 (S77), ends the sewing detection process, and returns the process to the sewing process of FIG.

When the CPU 91 acquires the detected thickness T13 in the first specific example (S51, S53: YES), the CPU 91 determines that the detected thickness has changed (S56: YES), and notifies a warning (S57). The CPU 91 refers to the setting table 97, determines that the next setting order is stored in the setting table 97 (S58: YES), sets the sewing conditions, and sets the sewing conditions corresponding to the following 3 (S59). ), The reference thickness T1 corresponding to the setting order of 3 is acquired (S60). The CPU 91 compares the detected thickness T13 detected in S51 with the reference thickness T1 acquired in S60, and calculates the difference between the detected thickness T13 and the reference thickness T1 (S63). The CPU 91 refers to the threshold table 98, acquires the warning threshold H1 (S64), and determines that the absolute value of the difference calculated in S63 is equal to or higher than the warning threshold H1 (S65: YES). The CPU 91 notifies a warning (S66) and stores the sewing stop setting in the RAM 93 (S68). The CPU 91 ends the sewing detection process and returns the process to the sewing process of FIG.

When the CPU 91 acquires the detection thickness T22 in the second specific example (S51, S53: YES), the CPU 91 determines that the detection thickness does not change (S56: NO), terminates the detection process during sewing, and performs the process in FIG. Return to the sewing process. When the CPU 91 acquires the detected thickness T23 in the second specific example (S51, S53: YES), the CPU 91 determines that the detected thickness has changed (S56: YES), and the CPU 91 notifies a warning (S57). The CPU 91 refers to the setting table 97 and determines that the next setting order is not stored in the setting table 97 (S58: NO). The CPU 91 acquires a reference thickness T2 corresponding to the current sewing conditions (S62). The CPU 91 compares the detection thickness T23 detected in S51 with the reference thickness T2, and calculates the difference between the detection thickness T23 and the reference thickness T2 (S63). The CPU 91 refers to the threshold table 98, acquires the warning threshold H1 (S64), and determines that the absolute value of the difference calculated in S63 is not equal to or higher than the warning threshold H1 (S65: NO). The CPU 91 refers to the threshold table 98, acquires the change threshold H2 (S71), and determines that the absolute value of the difference calculated in S63 is the change threshold H2 or more (S72: YES). The CPU 91 changes the sewing conditions according to the detected thickness T23 detected in S51 to the sewing conditions associated with the reference thickness T3 closest to the detected thickness T23 in the number table 96 (S73). The CPU 91 refers to the threshold table 98, acquires the effective threshold H3 (S74), and determines that the difference calculated in S63 is equal to or greater than the effective threshold H3 (S75: YES). The CPU 91 effectively sets the penetration force improving function (S76). When the difference calculated in S63 is not equal to or higher than the effective threshold value H3 (S75: NO), the CPU 91 may disable the penetration force improving function. The CPU 91 notifies the comparison result of S63 (S77), ends the sewing detection process, and returns the process to the sewing process of FIG.

Next to S13, the CPU 91 returns the process to S10. The CPU 91 determines whether or not the operation of turning off the power of the sewing device 1 is detected (S14). When the operation to turn off the power is not detected (S14: NO), the CPU 91 returns the process to S2. When the operation of turning off the power is detected (S14: YES), the CPU 91 ends the sewing process.

In the sewing device 1 of the above embodiment, the sewing device 1, the needle bar 6, the sewing needle 7, the outer presser bar 10, the outer presser foot 11, the needle plate 14, the spindle motor 21, the needle bar mechanism 32, the detector 49, and the storage device 94. Is an example of the sewing device, the needle bar, the sewing needle, the outer presser bar, the outer presser foot, the needle plate, the spindle motor, the needle bar mechanism, the detection unit, and the storage unit of the present invention. The CPU 91 that performs S51 is an example of the acquisition unit of the present invention. The CPU 91 that performs S63 is an example of the comparison unit of the present invention. The CPU 91 that performs S57, S66, and S77 is an example of the notification control unit of the present invention. The CPU 91 that performs S64 is an example of the warning threshold value acquisition unit of the present invention. The CPU 91 that performs S71 is an example of the change threshold acquisition unit of the present invention. The CPU 91 that performs S59 and S73 is an example of the condition changing unit of the present invention. The CPU 91 that performs S74 is an example of an effective threshold value acquisition unit. The CPU 91 that performs S76 is an example of an effective setting unit. The CPU 91 that performs S68, S10, and S11 is an example of the sewing stop portion of the present invention. The CPU 91 that performs S55 is an example of the sewing stop portion of the present invention. The CPU 91 that performs S36 is an example of the storage control unit of the present invention.

The sewing device 1 includes a needle plate 14, a needle bar 6, a needle bar mechanism 32, a spindle motor 21, an outer presser bar 10, a detector 49, and a CPU 91. The needle plate 14 is on which the object to be sewn is placed. The needle bar 6 extends in the vertical direction, and the sewing needle 7 can be attached to the lower end. The needle bar mechanism 32 moves the needle bar 6 up and down. The spindle motor 21 drives the needle bar mechanism 32. The outer presser foot 11 can be attached to the lower end of the outer presser bar 10, and the sewn object placed on the needle plate 14 is pressed by the outer presser foot 11 from above. The detector 49 detects the detected thickness, which is the thickness of the sewn object pressed by the outer presser foot 11 (S51). The CPU 91 acquires a reference thickness which is a reference thickness of one or a plurality of sewn objects (S62, S60). CP91 compares the detected thickness with the reference thickness (S63). The CPU 91 notifies the comparison result (S77). Since the sewing device 1 notifies the comparison result between the detected thickness and the reference thickness, the operator can refer to the comparison result notified by the sewing device 1, and the outer pressing foot 11 is placed on the needle plate 14 according to the comparison result. It is possible to confirm whether or not the pressed sewn object is the sewn object intended by the operator. Therefore, the sewing device 1 can improve the convenience of the operator when performing sewing according to the thickness of the object to be sewn, as compared with the conventional case.

The CPU 91 acquires the warning threshold value H1 used for comparing the difference between the detected thickness and the reference thickness (S52). When the difference between the reference thickness and the detected thickness is equal to or greater than the warning threshold value H1 (S65: YES), the CPU 91 notifies a warning (S66). By appropriately setting the warning threshold value H1, the sewing device 1 can notify the operator that the sewn object having a thickness not intended by the operator is placed on the needle plate 14. By referring to the warning, the operator can avoid sewing on the object to be sewn unintentionally by the operator.

The CPU 91 acquires a change threshold value H2 smaller than the warning threshold value H1 (S71). When the difference between the reference thickness and the detected thickness is smaller than the warning threshold value H1 (S65: NO) and equal to or greater than the change threshold value H2 (S72: YES), the sewing conditions are changed according to the detected thickness (S73). By appropriately setting the warning threshold value H1 and the change threshold value H2 in the sewing device 1, the difference between the reference thickness and the detected thickness is not large enough for the operator to notify the warning, but under the sewing conditions set according to the reference thickness. When it is not suitable for sewing, the sewing conditions can be automatically changed according to the detected thickness. The sewing device 1 can save the trouble of the operator changing the sewing conditions during sewing. Since the sewing device 1 sets the thread tension according to the detected thickness, it is possible to sew in consideration of the friction between the sewn object and the needle thread according to the thickness of the sewn object. Since the sewing device 1 sets the pressing pressure according to the detected thickness, the object to be sewn can be appropriately pressed and sewn. Since the sewing device 1 sets the amount of alternating rise according to the detected thickness, it is possible to reduce the possibility that the step portion cannot be overcome, and to suppress the generation of noise due to the collision between the step portion and the outer holding foot 11. can. Since the sewing device 1 adjusts the rotation speed of the spindle motor 21 according to the detected thickness, it is possible to increase the possibility that sewing will be completed in the assumed working time.

The sewing device 1 acquires an effective threshold value H3 smaller than the warning threshold value H1 (S74). When the difference between the reference thickness and the detection thickness is smaller than the warning threshold value H1 (S65: NO), and the difference, which is the value obtained by subtracting the reference thickness from the detection thickness, is the effective threshold value H3 or more (S75: YES). By driving the spindle motor 21 with an energization pattern different from that when sewing a sewn object having a reference thickness, the penetrating force improving function for improving the penetrating force of the sewn object by the sewing needle 7 is effectively set (S76). .. Generally, when the penetrating force of the needle bar 6 is insufficient with respect to the sewn object, the sewing needle 7 cannot penetrate the sewn object, resulting in sewing failure. When the penetrating force of the needle bar 6 is excessive with respect to the object to be sewn, the noise increases and the operator feels uncomfortable. By appropriately setting the warning threshold value H1 and the effective threshold value H3 in the sewing device 1, the difference between the reference thickness and the detected thickness is not so large as to notify the warning, but under the sewing conditions set according to the reference thickness. When it is difficult for the sewing needle 7 to penetrate the object to be sewn during sewing, the penetration force improving function can be automatically set effectively. The sewing device 1 can save the trouble of the operator effectively setting the penetrating force improving function during sewing. The sewing device 1 can suppress deterioration of the quality of the sewn product due to insufficient penetration force of the needle bar 6.

When the difference between the reference thickness and the detected thickness acquired while driving the spindle motor 21 is equal to or greater than the warning threshold value H1, the sewing device 1 stops driving the spindle motor 21 (S68, S10: YES, S11). By appropriately setting the warning threshold value H1, the sewing device 1 can prevent the operator from continuing to sew an object to be sewn with an unintended thickness.

The CPU 91 of the sewing device 1 detects the detected thickness before the start of driving the spindle motor 21 based on the detection result of the detector 49 (S51 in FIG. 8), and the reference thickness and the detected thickness detected before the start of driving the spindle motor 21. (S77 in FIG. 8). The operator can refer to the comparison result notified by the sewing device 1, and the sewing device 1 is placed on the needle plate 14 according to the comparison result, and the sewn object pressed by the outer presser foot 11 is the sewing intended by the operator. You can check if it is a thing before sewing. Therefore, the sewing device 1 can further improve the convenience of the operator when performing sewing according to the thickness of the object to be sewn.

The CPU 91 of the sewing device 1 detects the detected thickness while driving the spindle motor 21 based on the detection result of the detector 49 (S51 in FIG. 9), and when the detected thickness changes while driving the spindle motor 21. Notify a warning (S56: YES, S57). When the detected thickness changes while the spindle motor 21 is being driven, the sewing device 1 can notify the operator by notification. The operator can refer to the notification by the sewing device 1 and appropriately deal with the change in the detected thickness depending on whether or not the change is intended by the operator. The operator can grasp, for example, that the sewn object has unintentionally come off between the needle plate 14 and the outer presser foot 11 by the warning notified by the sewing device 1. The operator can notice that the object to be sewn is unintentionally folded and sewn, for example, by the warning notified by the sewing device 1.

The CPU 91 of the sewing device 1 detects the detected thickness while driving the spindle motor 21 based on the detection result of the detector 49 (S51 in FIG. 9), and when the detected thickness changes while driving the spindle motor 21. (S56: YES), the sewing conditions are changed according to the detected thickness (S59, S73). When the detected thickness detected while driving the spindle motor 21, the sewing device 1 can automatically change the sewing conditions according to the detected thickness. The sewing device 1 can save the trouble of the operator changing the sewing conditions during sewing.

The CPU 91 of the sewing device 1 detects the detected thickness while driving the spindle motor 21 based on the detection result of the detector 49 (S51 in FIG. 9), and the detected thickness detected while driving the spindle motor 21 is larger than a predetermined value. When it is small (S53: NO), it notifies that there is no sewn object between the needle plate 14 and the outer presser foot 11 (S54), and when the detected thickness detected while driving the spindle motor 21 is smaller than the predetermined value. , The drive of the spindle motor 21 is stopped (S55). The sewing device 1 notifies that the object to be sewn is not between the needle plate 14 and the outer presser foot 11, and can stop the drive of the spindle motor 21. The sewing device 1 can prevent the spindle motor 21 from being continuously driven after sewing to the end of the object to be sewn.

The CPU 91 of the sewing device 1 acquires a plurality of reference thicknesses in the order of setting while driving the spindle motor 21 (S60), and when the detected thickness detected while driving the spindle motor 21 changes, the detected thickness and the setting order are next. (S63). The CPU 91 notifies a warning when the difference between the detected thickness and the next reference thickness in the setting order is the warning threshold value H1 or more (S65: YES) (S66). When sewing an object to be sewn whose thickness changes during sewing, the sewing device 1 can avoid detecting a portion where the thickness changes as an abnormality. When the sewing device 1 detects a change in the detected thickness, the setting order compares the next reference thickness with the detected thickness. The thickness can be compared properly. By referring to the notification result of the sewing device 1, the operator can see the sewn object come off between the needle plate 14 and the outer presser foot 11 or the sewn object, for example, even when the same sewing pattern is sewn repeatedly several times. You can notice that you sew in a folded state unintentionally, sew the wrong number of sewn items, or make a mistake in the type of sewn item.

The sewing device 1 includes a storage device 94 that stores a plurality of combinations of a reference thickness and a set order during driving of the spindle motor 21. The CPU 91 acquires a plurality of combinations stored in the setting table 97 of the storage device 94 in the order of setting (S60). When sewing a sewn object whose thickness changes during sewing as in the first specific example of FIG. 10A, the sewing device 1 can avoid detecting a portion where the thickness changes as an abnormality. When the sewing device 1 detects a change in the detected thickness, the setting order compares the next reference thickness with the detected thickness. The thickness can be compared properly.

The CPU 91 of the sewing device 1 sets the detection thickness detected by the detector 49 as the reference thickness (S23), and stores the combination of the reference thickness and the setting order in the plurality of storage devices 94 (S25). The sewing device 1 can store the combination of the reference thickness and the setting order in the plurality of storage devices 94 with the detection thickness detected by the detector 49 as the reference thickness. The sewing device 1 can reduce the influence of the mounting tolerance of the detector 49 on the sewing device 1 as compared with the device that acquires the combination of the reference thickness and the setting order from other devices.

The present invention is not limited to the above embodiment. The type of the sewing device 1 may be appropriately changed such as a lockstitch sewing machine and a vertical feed sewing machine. The sewing device 1 does not have to include a middle presser bar and a middle presser foot. The method by which the detector 49 detects the thickness of the sewn object may be appropriately changed, and for example, any of an optical type, an eddy current type, an ultrasonic type, and a contact type proximity displacement sensor may be used. The arrangement of the detector 49 and the detection time may be changed as appropriate.

The program including the command for the sewing device 1 to execute the sewing process may be stored in the storage device 94 of the sewing device 1 by the time the CPU 91 executes the program. Therefore, the program acquisition method, acquisition route, and device for storing the program may be changed as appropriate. The program executed by the CPU 91 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, a PC, a server connected to the sewing device 1 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 91. The processing executed by the sewing device 1 may be distributed processing by a plurality of electronic devices (for example, a plurality of CPUs). The order of each step of the process executed by the sewing device 1 can be changed, the step can be omitted, or the step can be added as needed. The scope of the present invention also includes a mode in which an operating system (OS) or the like operating on the sewing apparatus 1 performs a part or all of each process by a command of the CPU 91. The sewing device 1 may appropriately make the following changes to the above embodiment, for example.

The sewing device 1 may or may not change the sewing conditions according to the detected thickness of the object to be sewn. The sewing device 1 may enable or disable the setting of the penetration force improving function according to the detected thickness of the object to be sewn, or may not change the setting. When the sewing device 1 changes the sewing conditions according to the detected thickness of the object to be sewn, the sewing conditions to be changed may be appropriately changed according to the configuration of the sewing device 1. The sewing device 1 may notify the comparison result and the warning by any method such as voice output and warning light lighting. At least one of the number table 96, the setting table 97, and the threshold table 98 may be appropriately changed. The sewing device 1 may change or omit the process using at least one of the warning threshold value H1, the change threshold value H2, the effective threshold value H3, the thickness threshold value, and the change threshold value. For example, the sewing device 1 omits S68 in FIG. 9, and when the absolute value of the difference between the detected thickness and the reference thickness is equal to or higher than the warning threshold value H1 (S65: YES), only notifies a warning (S66) and stops sewing. You don't have to. The setting method of at least one of the warning threshold value H1, the change threshold value H2, the effective threshold value H3, the thickness threshold value, and the change threshold value may be appropriately changed. At least one of the warning threshold value H1, the change threshold value H2, the effective threshold value H3, and the change threshold value may be a value to be changed according to at least one of the detection thickness and the reference thickness, or a value represented by a mathematical formula. It may be a value stored in the table in advance, or it may be a value input by the operator.

For example, the sewing device 1 omits S55 in FIG. 9, and when the detected thickness is not equal to or greater than the thickness threshold value (S53: NO), it only notifies a warning (S54) and does not have to stop sewing. The sewing apparatus 1 may acquire the detected thickness only before the start of sewing or during sewing, and compare the detected thickness with the reference thickness. The sewing device 1 may omit S56 and may not detect whether or not the detected thickness has changed during sewing. The sewing device 1 may omit S53 to S55, and may not detect or notify that there is no object to be sewn between the needle plate 14 and the outer presser foot 11. The sewing device 1 does not have to store the setting table 97, and S58 to S60 may be omitted. The sewing device 1 does not have to perform a part or all of the setting process of FIG. 7, and for example, a reference thickness may be set in the detection result of the input unit 16. The sewing device 1 may detect the detected thickness during sewing of the object to be sewn at a predetermined time in at least one of S23 and S35. At this time, since the detected thickness changes according to the sewing conditions of the sewing device 1, the CPU 91 may store the sewing conditions together with the detected thickness in S25 and S36. Sewing conditions include, for example, the number of stitches, the presence / absence of a pause, the presence / absence of thread trimming, the change in feed amount, the presence / absence of reversal of the rotation direction of the spindle 31, the change in thread tension, the change in pressing pressure, the change in the amount of alternating rise, and the number of rotations. The conditions may be appropriately selected from the changes in.

1: Sewing device 6: Needle bar 7: Sewing needle 10: Outer presser bar 11: Outer presser foot 13: Thread tensioner 14: Needle plate 21: Main shaft motor 22: Presser motor 23: Alternate rise amount adjustment motor 24: Feed amount adjustment Motor 25: Thread tension solenoid 27: Main shaft motor 32: Needle bar mechanism 34: Presser mechanism 36: Feed mechanism 37: Feed amount adjusting mechanism 49: Detectors 56 to 59: Encoder 90: Control unit 91: CPU
94: Storage device 96: Number of sheets table 97: Setting table

Claims (12)

A needle plate on which the sewing material is placed and
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,
The spindle motor that drives the needle bar mechanism and
A presser foot that can be attached to the lower end and presses the sewn object placed on the needle plate from above with the presser foot,
In a sewing apparatus provided with a detection unit for detecting a detection thickness which is the thickness of the sewn object pressed by the presser foot.
An acquisition unit that acquires a reference thickness, which is the thickness of one or a plurality of the sewn objects as a reference.
A comparison unit that compares the detected thickness with the reference thickness,
A sewing device including a notification control unit that notifies the comparison result of the comparison unit. A warning threshold value acquisition unit for acquiring a warning threshold value used for comparing the difference between the detected thickness and the reference thickness is further provided.
The sewing device according to claim 1, wherein the notification control unit notifies a warning when the difference between the reference thickness and the detection thickness is equal to or greater than the warning threshold value. A change threshold acquisition unit that acquires a change threshold smaller than the warning threshold, and a change threshold acquisition unit.
When the difference between the reference thickness and the detected thickness is smaller than the warning threshold value and equal to or greater than the change threshold value, the sewing condition is further provided with a condition changing unit that changes the sewing condition according to the detected thickness. The sewing apparatus according to claim 2. An effective threshold value acquisition unit that acquires an effective threshold value smaller than the warning threshold value,
When the difference between the reference thickness and the detection thickness is smaller than the warning threshold value and the value obtained by subtracting the reference thickness from the detection thickness is equal to or more than the effective threshold value, the sewing of the reference thickness. Further provided with an effective setting unit for effectively setting a penetration force improving function for improving the penetration force of the object to be sewn by the sewing needle by driving the spindle motor with an energization pattern different from that at the time of sewing the object. The sewing apparatus according to claim 2 or 3. Claims 2 to 4 further include a sewing stop portion for stopping the driving of the spindle motor when the difference between the reference thickness and the detected thickness acquired during the driving of the spindle motor is equal to or greater than the warning threshold value. The sewing device according to any one of. The detection unit detects the detection thickness before the start of driving the spindle motor, and the detection unit detects the detection thickness.
The sewing device according to claim 1, wherein the notification control unit notifies the comparison result of the reference thickness and the detected thickness detected before the start of driving the spindle motor. The detection unit detects the detection thickness while driving the spindle motor, and the detection unit detects the detection thickness.
The sewing device according to claim 6, wherein the notification control unit notifies a warning when the detected thickness changes while the spindle motor is being driven. The detection unit detects the detection thickness while driving the spindle motor, and the detection unit detects the detection thickness.
The sewing according to claim 6 or 7, further comprising a condition changing portion that changes the sewing condition according to the detected thickness when the detected thickness detected during the driving of the spindle motor changes. Device. The detection unit detects the detection thickness while driving the spindle motor, and the detection unit detects the detection thickness.
When the detected thickness detected while driving the spindle motor is smaller than a predetermined value, the notification control unit notifies that the sewing material is not between the needle plate and the holding foot.
The invention according to any one of claims 6 to 8, further comprising a sewing stop portion for stopping the driving of the spindle motor when the detected thickness detected during the driving of the spindle motor is smaller than the predetermined value. Sewing equipment. A warning threshold value acquisition unit for acquiring a warning threshold value used for comparing the difference between the detected thickness and the reference thickness is further provided.
The acquisition unit acquires the reference thickness in the order of setting while driving the spindle motor.
When the detected thickness detected while driving the spindle motor changes, the comparison unit compares the detected thickness with the reference thickness whose setting order is next.
The sewing device according to claim 1, wherein the notification control unit notifies a warning when the difference between the detection thickness and the reference thickness next to the setting order is equal to or greater than the warning threshold value. Further, a storage unit for storing a plurality of combinations of the reference thickness during driving of the spindle motor and the setting order is provided.
The sewing device according to claim 10, wherein the acquisition unit acquires a plurality of the combinations stored by the storage unit in the order of setting. A claim characterized in that the detection thickness detected by the detection unit is set as the reference thickness, and a storage control unit for storing a plurality of the combinations of the reference thickness and the setting order in the storage unit is further provided. Item 11. The sewing apparatus according to item 11.

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