JP2009112501A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine capable of easily setting a sewing speed suited to the sewing. <P>SOLUTION: This sewing machine 1 includes a needle bar 2 vertically moving with a sewing needle 2a attached thereto, a moving mechanism 10 moving a workpiece, a sewing machine motor 5, an X-axis motor 12 and a Y-axis motor 14 for actuating the moving mechanism 10, a sewing machine motor 5 for rotating a main spindle, a control device 20 for controlling the X-axis motor 12 and the Y-axis motor 14, a main spindle encoder 6 for detecting the rotation angle of the main spindle, an X-axis position sensor 13 and a Y-axis position sensor 15 for detecting the position of the moving mechanism 10, an EEPROM 24 for storing sewing data, the main spindle rotating angle and the position of the moving mechanism 10, and a CPU 21 calculating a settling time Ts of the moving mechanism 10, the rotating speed of the sewing machine motor 5 corresponding to the settling time Ts, and an operation start angle θstart of the moving mechanism 10 based on the storage content of the EEPROM 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine that holds a sewing product and sews it on a moving mechanism that can move horizontally with respect to the vertical movement of a needle bar to which a sewing needle is attached.

2. Description of the Related Art Conventionally, there is known a sewing machine that holds a sewing product and sews it on a moving mechanism that is horizontally movable with respect to the vertical movement of a needle bar to which a sewing needle is attached. Moreover, as one form of such a sewing machine, motors (X-axis motor, Y-axis motor) that drive a moving mechanism in each of two directions (X-axis direction and Y-axis direction) perpendicular to the horizontal plane are provided. A sewing machine that sews while moving a sewing product by providing the sewing machine is known.
In general, the sewing machine has a moving mechanism within the time from when the sewing needle is not pierced into the sewing product, that is, from the timing immediately after the previous needle is removed from the sewing product to the timing immediately before the next needle is pierced into the sewing product. Move. Normally, the upper limit value of the maximum sewing speed is determined in accordance with the feed pitch for moving the sewing product at regular intervals. If the sewing needle is within the limit value, the sewing needle moves the sewing product within the limit value. It is controlled to finish moving the moving mechanism within the time when it is not stuck. In order to correct the starting delay of the moving mechanism, the moving command is output earlier by the moving time until starting.

If the timing for controlling the movement mechanism to finish moving within the time when the above-mentioned sewing needle is not pierced by the sewing product is shifted, the sewing product moves while the sewing needle remains pierced. This causes a so-called needle flow in which the sewing needle is pulled in the moving direction of the moving mechanism. The rotation speed of the main shaft of the sewing machine is detected so that the control timing for moving the movement mechanism does not deviate when the rotation speed of the main shaft of the sewing machine is high and low, and the movement start timing of the movement mechanism is determined according to the rotation speed. A sewing machine that prevents needle flow by changing the angle of the main shaft is known (for example, Patent Document 1).
JP 2000-279666 A

However, in the conventional sewing machine according to Patent Document 1, only the movement start timing of the moving mechanism is changed in accordance with the rotational speed of the main shaft of the sewing machine.
Therefore, when the presser foot that holds the sewn product of the moving mechanism is changed, the control device moves to the drive motor of the moving mechanism by changing the weight of the entire moving mechanism or the presser foot with respect to the support mechanism of the moving mechanism. If the movement time from when the command is output until the movement mechanism starts, the movement time until the movement mechanism stops at the command movement amount, or the amount of overshoot with respect to the stop position when the movement mechanism stops change Since there was no sensor for detecting the change, it could not be dealt with. For this reason, when the movement time until stopping becomes longer than before the change of the presser foot, a needle flow in which the movement mechanism moves after the needle is pierced from the sewing product occurs. Also, if the movement time from the movement command to the start is shorter than when the movement mechanism starts the next movement amount compared to the change of the presser foot, the movement mechanism will move before the needle comes out of the sewing product. The needle flow that moves or occurs. That is, the needle flow when the moving mechanism moves after the needle has been pierced from the sewing product has a problem that the sewing needle may break. The needle flow in the case where the moving mechanism moves before the needle is completely removed from the sewing product has a problem that the thread tightening is deteriorated. In both cases, when the sewing product moves while the sewing needle is stuck in the sewing product, the through-hole of the sewing needle with respect to the sewing product becomes larger, and the position of the seam is further shifted, so that the sewing quality is deteriorated. Have.

Further, in the conventional sewing machine, there is no means for giving the operator information on the needle bar operation timing of the sewing machine and the response state of the moving mechanism before actual sewing, so new conditions (sewing patterns and In the case of changing the presser foot), it was impossible to judge whether good sewing quality could be obtained without trial sewing.
In addition, if the sewing needle breaks as a result of the sewing quality obtained from the trial sewing or if the sewing quality cannot be obtained, the information to solve the problem will be the same as the sewing product that has been subjected to the trial sewing. Since it can be obtained only from the needle, there is no effective means for eliminating the sewing quality due to the influence of the needle bar operation timing of the sewing machine and the response state of the moving mechanism other than by reducing the rotational speed of the sewing machine and repeating the trial sewing again. However, this method has a problem that although the cause analysis takes time, the true cause is not always found. Further, there is a problem that a defective product of the sewn product is generated every time trial sewing is performed, and the disposal cost of the sewn product is increased due to the poor sewing. Furthermore, there is a problem that it takes time to repeat trial sewing before finding an appropriate sewing condition.
In addition, since there is no option other than reducing the rotational speed of the sewing machine as a measure for solving the cause, there is a problem that productivity is surely reduced.

  In view of the above-described problems, the present invention prevents the needle flow that degrades the sewing quality by the needle bar operation timing of the sewing machine and the response state of the moving mechanism, and the sewing quality by the needle bar operation timing of the sewing machine and the response state of the moving mechanism. It is an object of the present invention to provide a sewing machine that can provide an operator with effective information for solving a problem affecting the sewing machine and that can minimize a decrease in productivity due to a decrease in sewing speed of the sewing machine.

The invention described in claim 1 includes a needle bar that moves up and down in conjunction with rotation of the main shaft by attaching a sewing needle, a moving mechanism that moves a sewing product on a horizontal plane perpendicular to the vertical movement direction of the needle bar, A sewing motor for rotating the main shaft, a driving motor for driving the moving mechanism, a control means for controlling the driving motor, the stitch pitch and the number of stitches of the seam applied to the sewing product, and the rotational speed of the main shaft. A sewing machine that performs sewing by operating the needle bar and the moving mechanism on the basis of the sewing pitch, the number of stitches, and the rotational speed of the main shaft of the sewing data. The first detection means for detecting the rotation angle of the spindle, the second detection means for detecting the position of the movement mechanism, and the movement mechanism driven by a position command of the movement mechanism based on the sewing data. At a given time The second storage means for storing the rotation angle of the spindle detected by the first detection means and the position of the moving mechanism detected by the second detection means for each time, and the second storage means. An operation time calculating means for calculating a required operation time of the moving mechanism from a position of the moving mechanism; a speed calculating means for calculating a rotational speed of a sewing machine motor based on a calculation result of the required operation time by the operating time calculating means; An operation start angle calculation means for calculating an operation start angle of the moving mechanism based on a calculation result of an operation required time by the operation time calculation means, a sewing pitch and the number of stitches of the sewing data, and a rotation speed of the spindle. When operating the needle bar and the moving mechanism, the sewing machine motor by the speed calculation means obtained when the sewing machine was driven based on the sewing data before. The sewing machine motor is driven based on the calculation result of the rolling speed and the calculation result of the operation start angle of the moving mechanism by the operation start angle calculation means obtained when the sewing machine was previously driven based on the sewing data. Sewing control means to be provided.
The “movement start angle of the moving mechanism” refers to the rotation angle of the main shaft when the moving mechanism starts operating.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect, the vertical movement position of the needle bar every predetermined time based on the rotational speed of the sewing machine motor calculated by the speed calculation means and the operation time calculation means are calculated. And a display unit capable of displaying the position of the moving mechanism for each predetermined time based on the required operation time of the moving mechanism and the operation start angle of the movement mechanism by the operation start angle calculating unit. To do.

  According to a third aspect of the present invention, in the sewing machine according to the first or second aspect, the sewing machine includes an interface connectable to an external computer, and the operation time calculation means calculates the operation time required for the moving mechanism and the speed calculation. The calculation of the rotational speed of the sewing machine motor by the means and the calculation of the operation start angle of the moving mechanism by the operation start angle calculation means are performed by the external computer connected via the interface. To do.

According to the first aspect of the present invention, in accordance with the time required for operation of the moving mechanism for each needle calculated by the operation time calculation means, the speed calculation means is the appropriate rotation speed of the sewing machine motor, that is, the sewing speed for that time. Is calculated. Note that the calculation of the operation time of the moving mechanism by the operation time calculation means and the calculation of the rotational speed of the sewing machine motor by the speed calculation means are performed before the sewing work is performed using the sewing data. The rotation angle of the spindle and the position of the moving mechanism detected by the first detection means and the second detection means at every predetermined time, and the calculation results of the operation time calculation means, the speed calculation means, and the operation start angle calculation means are as follows: And stored in the second storage means. Therefore, after the sewing work is performed once based on the sewing data, the sewing work is performed according to the operation time of the moving mechanism and the rotation speed of the sewing machine motor stored in the second storage means when performing the sewing work based on the sewing data. In this case, the movement mechanism is operated at the timing before the needle is removed from the sewing product, or the movement mechanism is operated at the timing after the needle is pierced into the sewing product, thereby eliminating the needle flow. Is possible. As a result, due to the needle flow in which the moving mechanism operates at the timing before the needle is removed from the sewing product, the sewing quality deteriorates due to deterioration of the sewing tightening, enlargement of the through hole of the sewing needle with respect to the sewing product, misalignment of the seam, etc. The problem can be solved. Therefore, the sewing quality is improved. In addition, it is possible to solve the problem that the sewing needle breaks due to the needle flow in which the moving mechanism operates at the timing after the needle has pierced the sewing product. Therefore, the reliability of the sewing machine is improved.
Further, as described above, the operation start calculating means and the speed calculating means automatically calculate the appropriate rotation speed of the sewing machine motor corresponding to the movement of the sewing product and the operation start angle of the moving mechanism, and the second storage means. To remember. As a result, in the prior art, the sewing speed setting of the sewing machine and the operation start angle of the moving mechanism for eliminating the needle flow of the sewing quality problem caused by the feeding of the moving mechanism, which was handled by the operator manually lowering the sewing speed of the sewing machine. Can be performed automatically. Therefore, it is possible to set the sewing speed for preventing needle flow and the operation start angle of the moving mechanism very easily and reliably as compared with the conventional case. In addition, since the needle flow, which is a sewing quality problem due to the feed of the moving mechanism, is not given to the operator by the needle bar operation timing of the sewing machine and the response state of the moving mechanism, an effective solution can be found. In addition, the handling method can solve the problem that only the rotation speed of the sewing machine is changed, and the reliability of the sewing machine is improved. In addition, since the proper sewing speed is automatically calculated, the sewing machine must be operated several times until the sewing speed suitable for sewing is found in the prior art, which eliminates the time-consuming problem and allows sewing. Work preparation time is shortened and work efficiency is improved. In addition, it is possible to reduce costs associated with needle breakage and disposal of sewing products that may occur in trial sewing of a sewing machine performed until the proper sewing speed is found in the prior art. Further, the second storage means stores the position of the moving mechanism detected by the second detection means every predetermined time. Accordingly, the operation time of the moving mechanism can be calculated by the operation time calculation means after the sewing work based on the sewing data is completed. That is, the operation time calculation unit does not need to perform calculation processing in real time on the position of the moving mechanism detected by the second detection unit. Therefore, even if the operation time calculation means does not have the performance of performing the calculation process in real time on the position of the movement mechanism detected by the second detection means, the operation time of the movement mechanism can be calculated. That is, the performance requirement for the operation time calculation means can be set low, and the cost for configuring the operation time calculation means can be reduced.
Further, the second storage means stores the rotation angle of the spindle detected by the first detection means every predetermined time. Thereby, the rotation speed of the sewing machine motor can be calculated by the speed calculation means after the sewing work using the sewing data is completed. That is, the speed calculation unit does not need to perform calculation processing in real time on the position of the moving mechanism detected by the second detection unit. Therefore, the rotational speed of the sewing machine motor can be calculated even if the speed calculation means does not have the performance of performing the calculation process in real time on the position of the moving mechanism detected by the second detection means. That is, the performance requirement for the speed calculation means can be set low, and the cost for configuring the speed calculation means can be reduced.
The second storage means stores the rotation angle of the main shaft at predetermined time intervals. Thereby, the operation start angle of the moving mechanism can be calculated by the operation start angle calculating means after the sewing work based on the sewing data is completed. That is, the operation start angle calculation unit does not need to perform a calculation process in real time on the rotation angle of the main shaft detected by the first detection unit and the position of the moving mechanism detected by the second detection unit. Therefore, the operation start angle calculation means has a performance of performing calculation processing in real time on the rotation angle of the main shaft detected by the first detection means and the position of the moving mechanism detected by the second detection means. Even if not, the operation start angle of the moving mechanism can be calculated. That is, the performance requirement for the operation start angle calculation unit can be set low, and the cost of configuring the operation start angle calculation unit can be reduced.

  According to a second aspect of the present invention, the display means includes the vertical movement position of the needle bar for each predetermined time based on the rotational speed of the sewing machine motor calculated by the speed calculation means, and the movement calculated by the operation time calculation means. The position of the moving mechanism for every predetermined time based on the time required for the operation of the mechanism and the operation start angle of the moving mechanism by the operation start angle calculating means are displayed in correspondence with each other. That is, the vertical movement position of the needle bar of the sewing machine and the position of the movement mechanism are displayed in association with each other based on the rotational speed of the sewing machine motor calculated appropriately with respect to the operation time of the movement mechanism. Thereby, it is possible to visually grasp the effect of the calculation result of the rotation speed of the sewing machine motor by the speed calculation means before the operation of the sewing machine. Therefore, the operator can grasp the operation of the sewing machine more clearly.

  According to the third aspect of the present invention, the calculation of the time required for the operation of the moving mechanism by the operation time calculating means, the calculation of the rotational speed of the sewing machine motor by the speed calculating means, and the operation of the moving mechanism by the operation start angle calculating means. The calculation of the start angle is performed by an external computer connected via an interface. Therefore, it is not necessary to incorporate the operation time calculation means, speed calculation means, and operation start angle calculation means in the sewing machine control apparatus. Therefore, it is possible to provide a sewing machine including an operation time calculation unit, a speed calculation unit, and an operation start angle calculation unit without significantly changing the design of an existing sewing machine.

(Whole structure of the sewing machine according to the present invention)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A sewing machine 1 according to the present invention is a sewing machine that holds a sewing product and sews it on a moving mechanism 10 that is movable along a horizontal plane perpendicular to the vertical movement direction with respect to the vertical movement of a needle bar 2 to which a sewing needle 2a is attached. .
FIG. 1 is a perspective view showing a configuration of a sewing machine 1 according to the present invention. FIG. 2 is a block diagram illustrating the control device 20 and various configurations connected to the control device 20.
As shown in FIGS. 1 and 2, the sewing machine 1 includes a needle bar 2 provided on the lower surface of the arm part of the sewing machine frame and moving up and down, and a sewing product along a horizontal plane perpendicular to the vertical movement direction of the needle bar. The moving mechanism 10 to be moved, the pedal 3 for selecting various operations of the sewing machine 1 to be switchable, the control device 20 for performing various processes relating to the operation of the sewing machine 1, and various information about the operation of the sewing machine 1 are displayed, and the operator As a result, various inputs related to the operation of the sewing machine 1 are performed, and a transparent touch switch panel is provided on the front surface of the liquid crystal display screen for visually displaying various processing results of the CPU 21 of the control device 20 that has performed various processing related to sewing data, which will be described later. An operation panel display 4 that outputs a selection instruction signal by pressing a switch that is arranged and displayed, and RS-23 provided in the control device 20 Connected via port 25, and a PC40 to perform various types of processing relating to the CPU21 same described later sewing data of the control device 20, a monitor 41 for visually displaying various processes PC40, a.

The needle bar 2 detachably fixes the sewing needle 2a at its lower end. The needle bar 2 is connected to a main shaft 7 (not shown) arranged in the longitudinal direction of the arm portion of the sewing machine frame via a vertical movement mechanism (not shown). The vertical movement mechanism converts the rotation of the main shaft 7 into vertical movement and transmits it to the needle bar. The main shaft 7 is rotated by driving the sewing machine motor 5. That is, the needle bar 2 moves up and down by driving the sewing machine motor 5. At this time, the needle bar 2 is provided so as to perform one reciprocation of the vertical movement when the main shaft 7 rotates once. That is, the rotation angle of the main shaft 7 and the vertical movement position of the needle bar 2 have a certain relationship. The rotation angle of the main shaft 7 is detected by the main shaft encoder 6.
That is, the vertical movement position of the needle bar 2, that is, the vertical movement position of the sewing needle 2 a is detected from the rotation angle of the spindle 7 detected by the spindle encoder 6.
The operation of the sewing machine motor 5 is performed by the operator's operation on the pedal 3,
Drive control of the sewing machine motor 5 based on the operation is performed by the control device 20 described later.

(Movement mechanism)
The moving mechanism 10 moves the holding part 11 in a direction along one direction (hereinafter referred to as the X-axis direction) on the horizontal plane perpendicular to the vertical movement direction of the needle bar 2 and the holding part 11 that holds the sewing product. On the horizontal plane perpendicular to the vertical movement direction of the needle bar 2, the X-axis motor 12, the X-axis position sensor 13 that detects the shaft angle of the X-axis motor 12 to detect the position of the holding unit 11 in the X-axis direction In order to detect the position of the moving mechanism 10 in the Y-axis direction and the Y-axis motor 14 that moves the holding unit 11 in the direction that is perpendicular to the X-axis direction (hereinafter referred to as the Y-axis direction). And a Y-axis position sensor 15 that detects the shaft angle of the Y-axis motor 14. The X-axis position sensor 13 and the Y-axis position sensor 15 are rotary encoders provided on the axes of the X-axis motor 12 and the Y-axis motor 14, and detect the rotation angle of the shaft detected by each.

The holding unit 11 includes a lower plate on which the sewing product is placed and a presser foot that holds the sewing product placed on the lower plate by pressing from above. The presser foot is provided so as to be movable up and down with respect to the lower plate, and is moved up and down by driving a presser air cylinder (not shown) provided in the moving mechanism 10. The up-and-down movement of the presser foot is operated by driving the presser air cylinder through an operation on the pedal 3.
When the operator installs the sewing product on the holding unit 11, since the presser foot is held at the raised position after the sewing is finished, the sewing product is first placed on the upper surface of the lower plate positioned below the presser foot. Thereafter, when the presser foot is lowered by an operation on the pedal 3, the presser foot is lowered with respect to the sewing product, and the sewing product is held between the presser foot and the lower plate. In this way, the sewing product is held by the holding unit 11.

The X-axis motor 12 and the Y-axis motor 14 move the holding unit 11 along the X-axis direction and the Y-axis direction, so that the sewn product held by the holding unit 11 is perpendicular to the vertical movement direction of the needle bar 2. Move along. In other words, the cloth is fed by moving the sewing product to the sewing needle 2a that moves up and down by the vertical movement of the needle bar 2, and a stitch is formed as is well known.
The drive control of the X-axis motor 12 and the Y-axis motor 14 is performed by a control device 20 described later. Further, the position of the holding unit 11 in the X-axis direction is detected by the X-axis position sensor 13. The position of the holding unit 11 in the Y-axis direction is detected by a Y-axis position sensor 15.
From the detection results of the X-axis position sensor 13 and the Y-axis position sensor 15, the control device 20
The position of the moving mechanism 10 is detected. Therefore, the X-axis position sensor 13 and the Y-axis position sensor 15 function as “second detection means”.

(Control device)
As shown in FIG. 2, the control device 20 includes a CPU 21 that performs various processes related to the operation of the sewing machine 1, a RAM 22 that stores data related to various processes performed by the CPU 21, and a ROM 23 that stores various programs and data related to the operation of the sewing machine 1. An EEPROM 24 for storing various programs and data related to the operation of the sewing machine 1, an RS-232 port 25 as an “interface” connected to the PC 40 so that they can communicate with each other, a sewing machine motor 5, an X-axis motor 12, and a Y-axis motor 14. Drivers 29, 30, and 31, input / output ports 26 of the spindle encoder 6 and driver 29, input / output ports 27 of the X-axis position sensor 13 and driver 30, input of the Y-axis position sensor 15 and driver 31, respectively. Output port 28, operation panel display 4 and control It includes input and output ports 33 for connecting the device 20, the. Further, the CPU 21, the RAM 22, the ROM 23, the EEPROM 24, the RS-232 port 25, and the input / output ports 26, 27, 28, and 33 are connected to each other by a bus 32.

The CPU 21 calls various programs and data related to the operation of the sewing machine 1 from the ROM 23 and the EEPROM 24. At this time, the data to be called by the CPU 21 is the sewing data in which the sewing start position, the end position, the feed pitch and feed direction between them according to the sewing pattern in the sewing work, and the sewing speed in the sewing, that is, the rotational speed of the sewing machine motor 5 are stored. It is included. The CPU 21 performs processing for driving the sewing machine motor 5, the X-axis motor 12, and the Y-axis motor 14 based on the sewing data.
Further, based on the processing, the CPU 21 outputs instructions for driving the corresponding motors to the drivers 29, 30, and 31 via the input / output ports 26, 27, and 28, respectively.
In this way, the sewing machine motor 5, the X-axis motor 12, and the Y-axis motor 14 are driven, and the needle bar 2 is moved up and down and the moving mechanism 10 is moved for sewing.

Further, the rotation angle of the main shaft 7 detected by the main shaft encoder 6 at the time of sewing work using the sewing data is input to the CPU 21 via the input / output port 26. The rotation angle of the X-axis motor 12 detected by the X-axis position sensor 13 is input to the CPU 21 via the input / output port 27. Further, the rotation angle of the Y-axis motor 14 detected from the Y-axis position sensor 15 is input to the CPU 21 via the input / output port 28.
Further, when calculating the settling time of the moving mechanism 10 to be described later in the sewing operation based on the sewing data, and calculating the rotation speed of the sewing machine motor 5 and the operation start angle of the moving mechanism 10 corresponding to the settling time, the CPU 21 performs the spindle encoder 6. The timer interrupt for operating the data acquisition program for storing the inputs from the X-axis position sensor 13 and the Y-axis position sensor 15 in the EEPROM 24 every predetermined time is permitted, and the interrupt timer is operated. The inputs from the spindle encoder 6, the X-axis position sensor 13, and the Y-axis position sensor 15 are stored in the EEPROM 24 at predetermined time intervals in accordance with the operation instruction of the data acquisition program at predetermined time intervals by the interrupt timer. The input from the spindle encoder 6 is stored as the spindle rotation angle, and the inputs from the X-axis position sensor 13 and the Y-axis position sensor 15 are stored in the EEPROM 24 as the positions of the moving mechanism 10.
At the end of the sewing work using the sewing data, the timer interrupt of the interrupt timer is prohibited and the interrupt timer operation is also stopped.

  As the sewing data, a plurality of sewing data different for each sewing pattern is prepared and stored in the EEPROM 24. The list of the plurality of sewing data is displayed on the operation panel display 4 before the sewing work by the sewing machine 1 is started. When one of the plurality of sewing data is selected by the operator, the control device 20 drives the sewing machine motor 5, the X-axis motor 12, and the Y-axis motor 14 as described above based on the sewing pattern of the selected sewing data. And sew.

The CPU 21 performs various calculations in the sewing work based on the sewing data in which the main shaft rotation angle and the position of the moving mechanism are detected from the main shaft rotation angle and the position of the moving mechanism stored in the EEPROM 24. That is, based on the calculation for calculating the operation time required for the moving mechanism performed from the timing immediately after the previous needle is removed from the sewing product to the timing immediately before the next needle is stuck in the sewing product, and the operation required time for the moving mechanism. The calculation for calculating the appropriate rotation speed of the sewing machine motor 5 and the calculation for calculating the operation start angle of the movement mechanism based on the required operation time of the movement mechanism and the spindle rotation angle are performed. The calculation result is displayed on the operation panel display 4.
The PC 40 is a personal computer that is connected to the control device 20 via the RS-232 port 25 and can perform various processes related to the sewing data of the sewing machine 1, like the CPU 21 of the control device 20.
That is, the spindle rotation angle and the position of the moving mechanism stored in the EEPROM 24 of the control device 20 are read into the memory of the PC 40 via the RS-232 port 25, and the spindle rotation is determined from the spindle rotation angle and the position of the moving mechanism as in the CPU 21. Various calculations in the sewing work are performed based on the sewing data in which the angle and the position of the moving mechanism are detected. That is, based on the calculation for calculating the operation time required for the moving mechanism performed from the timing immediately after the previous needle is removed from the sewing product to the timing immediately before the next needle is stuck in the sewing product, and the operation required time for the moving mechanism. The calculation for calculating the appropriate rotation speed of the sewing machine motor 5 and the calculation for calculating the operation start angle of the movement mechanism based on the required operation time of the movement mechanism and the spindle rotation angle are performed. The calculation result is displayed on the monitor 41.

(Various functions of the sewing machine)
Next, various functions of the sewing machine 1 will be described in detail. FIG. 3 is a functional block diagram showing various functional configurations of the sewing machine 1.
As shown in FIG. 3, the sewing machine 1 stores a spindle encoder 6 that detects the rotation angle of the spindle 7, an X-axis position sensor 13 and a Y-axis position sensor 15 that detect the position of the moving mechanism, and sewing data. 1 storage means 51 and second storage means for storing the rotation angle of the spindle 7 detected by the spindle encoder 6 and the position of the moving mechanism 10 detected by the X-axis position sensor 13 and the Y-axis position sensor 15 every predetermined time. 52 and an operation for calculating the time required for operating the moving mechanism for each needle based on the position of the moving mechanism detected by the X-axis position sensor 13 and the Y-axis position sensor 15 with respect to the position command of the moving mechanism based on the sewing data. Depending on the time calculation means 56, the required movement time of the moving mechanism calculated by the operation time calculation means 56 and the rotation angle of the spindle 7 detected by the spindle encoder 6 The speed calculation means 57 for calculating the rotational speed of the motor 5 and the position of the moving mechanism detected by the X-axis position sensor 13 and the Y-axis position sensor 15 in response to the position command of the moving mechanism based on the sewing data and the spindle encoder 6 An operation start angle calculation unit 58 that calculates an operation start angle of the moving mechanism in each needle according to the detected rotation angle of the main shaft 7, an operation time calculation unit 56, a speed calculation unit 57, and an operation start angle calculation unit 58. Second storage means 52 for storing the calculation results, sewing control means 55 for performing sewing based on the respective calculation results stored in the second storage means 52 at the time of the sewing work based on the sewing data, and sewing control means 55 By means of the operating time calculation means 56, the vertical movement position of the needle bar every predetermined time based on the sewing speed of the sewing machine after the rotational speed of the sewing machine motor has been increased or decreased by There is provided an operation panel display 4 capable of displaying the position of the moving mechanism for each predetermined time based on the required operation time of the moving mechanism and the operation start angle of the movement mechanism calculated by the operation start angle calculating means 58 in correspondence with each other. ing.

  The first storage means 51 stores sewing data. That is, the above-described EEPROM 24 functions as the first storage unit 51. The second storage means 52 stores the rotation angle of the main shaft 7 detected by the main shaft encoder 6 and the position of the moving mechanism detected by the X-axis position sensor 13 and the Y-axis position sensor 15 every predetermined time. Therefore, the above-described EEPROM 24 functions as the second storage unit 52.

(Operating time calculation means)
The operation time calculation means 56 is a time required for operation of the moving mechanism in each needle based on the position of the moving mechanism detected by the X-axis position sensor 13 and the Y-axis position sensor 15 in response to the position command of the moving mechanism based on the sewing data. Is calculated. FIG. 4 shows an X-axis command position P of the moving mechanism 10 when the moving mechanism 10 moves between the timing immediately after the needle is removed from the sewing product and the timing immediately before the next needle is stuck in the sewing product. It is explanatory drawing which showed the relationship of the X-axis detection position Q of the moving mechanism 10 detected by the X-axis position sensor 13. FIG. POS in FIG. 4 is a curve showing the relationship between the X-axis command position P of the moving mechanism 10 and the X-axis detected position Q of the moving mechanism 10. ERR in FIG. 4 is a curve showing a deviation between the X-axis command position P of the moving mechanism 10 and the X-axis detected position Q of the moving mechanism 10.
Based on the sewing data, the control device 20 is driven until the moving mechanism 10 reaches the X-axis detection position B, and a position command P is output to the X-axis motor 12. The X-axis motor 12 that has received the output drives the moving mechanism 10. The operating position of the moving mechanism 10 in the X-axis direction is detected by the X-axis position sensor 13.

  As shown in FIG. 4, the response of the X-axis detection position Q of the moving mechanism 10 is delayed with respect to the X-axis command position P of the moving mechanism 10. The response of the moving mechanism 10 catches up to the X-axis command position P after the X-axis command position P stops, and converges to the target position B while oscillating after reaching the target position B. When the response of the moving mechanism 10 converges to the target position B while vibrating, a deviation ERR obtained by subtracting the response signal Q of the moving mechanism 10 from the X-axis command position P is calculated, and the deviation ERR is in a range of ± dP. If it is within the range, it is assumed that the error range is such that the sewing needle can pierce the sewing product, and the response signal Q of the moving mechanism 10 converges within the settling range of the X-axis command position P. The movement to the target position B is completed. Here, the above description has been made by taking the X-axis motor 11 and the X-axis position sensor 13 as an example. However, since the same processing is performed for the Y-axis motor 14 and the Y-axis position sensor 15, the description thereof will be omitted.

  At this time, it takes from the output of the command position P for driving the moving mechanism 10 until the vibration operation of the moving mechanism 10 converges to an error that does not interfere with the next sewing needle sticking into the sewing product. The operation required time is set as the settling time Ts, and the operation time calculating means 56 calculates the settling time Ts. The settling time of the moving mechanism 10 is calculated for both the X axis and the Y axis.

(Speed calculation means)
The speed calculation unit 57 calculates an appropriate rotation speed of the sewing machine motor 5 according to the settling time Ts calculated by the operation time calculation unit 56.
FIG. 5 is an explanatory diagram showing the correspondence between the vertical movement timing of the sewing needle 2a and the operation timing of the moving mechanism 10 when the rotational speed of the sewing machine motor 5 is corrected with the same timing at which the sewing needle 2a comes out of the sewing product. . FIG. 5A shows a state before the correction driven by the rotational speed of the sewing machine motor 5 in the sewing data and a state after the correction driven based on the rotational speed of the sewing machine motor 5 calculated by the speed calculating means 57. FIG. 5B is an explanatory view showing the correspondence between the vertical movement timing of the sewing needle 2a and the operation timing of the moving mechanism 10, and FIG. 5B is an enlarged explanatory view of the Z portion in FIG. Curves H and I in FIG. 5 are curves showing the transition of the vertical movement position of the sewing needle 2a with respect to the sewing product. A curve W in FIG. 5 is a curve showing the detection position of the moving mechanism 10 on the same time axis as the curves H and I. The curve H in FIG. 5 is a curve showing the transition of the vertical movement position of the sewing needle 2a before correction, and the curve I is the vertical movement of the sewing needle 2a after correction (driven by the rotational speed of the sewing machine motor 5 by the speed calculation means 57). It is a curve which shows the transition of a position.

The needle bar 2 moves up and down in accordance with the rotational speed of the sewing machine motor 5, and the sewing needle 2a repeats up and down movements for piercing and unplugging the sewing product. In the curve H shown in FIG. 5, while the sewing needle 2a is lowered from the sewing product upper surface position G, it is a section where the sewing needle 2a is stuck in the sewing product. While the sewing needle 2a is raised from the upper surface position G of the sewing product, it is a section in which the sewing needle 2a is removed from the sewing product. At this time, the time required for one rotation of the main shaft 7 is time Ta, and the sewing machine motor 5 is controlled so that the time required for one rotation of the main shaft 7 is time Ta.
In contrast, the moving mechanism 10 operates as indicated by the curve W. At this time, at the timing when the sewing needle 2a is pierced into the sewing product, the moving mechanism 10 generates a needle flow due to the needle penetrating feed position Wa exceeding the settling range of the target position B.

  Therefore, as shown in FIG. 5, the sewing speed at which the needle flow converged in the range of the target position B caused by the vibration at the stop of the moving mechanism 10 does not occur, that is, the main shaft 7 in the section where the sewing needle 2a is removed from the sewing product. The rotational speed of the sewing machine motor 5 is set based on the time Tb of one rotation. As a result, as indicated by the curve I after the timing when the sewing needle 2a pierces the sewing product, the feed position at the time of needle penetration of the moving mechanism 10 is within the set range of the target position B, so that the sewing needle breaks. The cause needle flow does not occur. The speed calculation means 57 calculates the rotational speed of the sewing machine motor 5 for setting the time Ta when the main shaft 7 makes one rotation to the time Tb at which no needle flow occurs.

FIG. 6 is an explanatory view showing the correspondence between the rotation angle of the main shaft 7 and the vertical movement position of the sewing needle 2a.
As described above, when the main shaft 7 makes one rotation, the needle bar 2 moves up and down once. As shown in FIG. 6, the vertical movement position of the sewing needle 2a and the rotation angle of the main shaft 7 have a certain relationship. For example, as shown in FIG. 6, the rotation angle when the needle bar 2 of the main shaft 7 is at the top dead center is 0 degree, and the rotation angle when the needle bar 2 is at the bottom dead center is 180 degrees. The rotation angle of the main shaft 7 at the timing Ha when the sewing needle 2a is removed from the sewing product is an angle θb that takes into account the position on the needle plate where the sewing product is held by the holding portion 11 of the moving mechanism 10 and the thickness of the sewing product. Become. The rotational angle of the main shaft 7 at the timing Hb when the sewing needle 2a is pierced into the sewing product is an angle θa taking into account the position on the needle plate where the sewing product is held by the holding portion 11 of the moving mechanism 10 and the thickness of the sewing product. Become. Usually, the rotation angle θa and the rotation angle θb of the main shaft 7 are set to be the same. For example, the angle θa and the angle θb are obtained as appropriate when the cloth thickness is input in the sewing data or when the operator inputs the cloth thickness separately from the sewing data. The rotation angle θ1 of the main shaft 7 where the needle is not stabbed into the sewing product is calculated by the following equation (1).
θ1 = 180 ° − (θa + θb) (1)
Since the measured settling time Ts is the minimum time required for the main shaft 7 to rotate during θ1, the maximum rotation speed time Tb for the main shaft 7 to make one rotation is calculated by the following equation (2). .
Tb = Ts × θ1 / 360 ° (2)
The rotational speed N [rpm] of the main shaft 7 is calculated by the following equation (3) based on the time Tb of one rotation of the main shaft 7 according to the equation (2).
N = 60 / Tb (3)
The rotation speed of the sewing machine motor 5 is the same as the calculation result of the rotation speed N according to the equation (3). Thus, the rotational speed of the sewing machine motor 5 is calculated. Here, when the maximum rotation speed N [rpm] of the main shaft 7 calculated from the measured settling time Ts is larger than the rotation speed of the sewing machine motor 5 of the sewing data, the lowest sewing machine rotation is performed by the sewing control program of the sewing machine. A speed limit value (maximum rotation speed value limited by each condition) is selected and sewing is performed.
The calculation of the rotational speed of the sewing machine motor 5 by the speed calculation means 57 is performed by the spindle encoder 6, the X-axis position sensor 13 and the Y-axis position sensor 15 stored in the EEPROM 24 every predetermined time after the sewing operation by the sewing data is finished. And the above calculation is performed. If the processing time of the CPU 21 of the control device 20 of the sewing machine has a margin, the calculation may be performed during the sewing operation based on the sewing data.

(Operation start angle calculation means)
The operation start angle calculation means 58 includes the position of the movement mechanism 10 detected by the X-axis position sensor 13 and the Y-axis position sensor 15 of the movement mechanism 10 based on the sewing data, and the rotation angle of the spindle 7 detected by the spindle encoder 6. Based on the above, the operation start angle θstart of the moving mechanism 10 in each needle is calculated.
FIG. 7 shows the state before the correction driven by the operation start angle of the moving mechanism 10 driven by the sewing data, and the case after the correction driven based on the operation start angle of the moving mechanism 10 calculated by the operation start angle calculating means 58. It is explanatory drawing showing the correspondence of the up-and-down movement timing of the sewing needle 2a, and the operation timing of the moving mechanism 10. A curve W in FIG. 7 is a curve showing the transition of the vertical movement position of the sewing needle 2a with respect to the sewing product. A curve W and a curve WA in FIG. 7 are curves indicating detection positions of the moving mechanism 10 on the same time axis as the curve H. A curve W in FIG. 7 is a curve showing the transition of the detection position of the movement mechanism 10 before correction, and the curve WA is the value of the movement mechanism 10 after correction (driven by the operation start angle of the movement mechanism 10 by the operation start angle calculation means 58). It is a curve which shows transition of a detection position.
The operation start angle calculation means 58 sets the operation start angle of the movement mechanism 10 so that the movement mechanism 10 starts the operation from the timing Ha immediately before the needle comes out of the sewing product. That is, when the moving mechanism 10 is driven by the sewing data, the sewing needle 2a is detected from the rotation angle θA of the main shaft 7 detected by the main shaft encoder 6 when the moving mechanism 10 starts to move from the detection position of the moving mechanism 10. An operation start angle θstart is set by adding the angle difference to the rotation angle θB of the main shaft 7 at the timing of withdrawal from the sewing product to the operation start angle when the moving mechanism 10 is driven by the sewing data. When the operation start angle when the moving mechanism 10 is driven by the sewing data is θ0, the operation start angle θstart is calculated by the following equation (4).
θstart = θ0 + (θB−θA) (4)

The operation start angle θstart calculated by the operation start angle calculation means 58 is calculated based on the spindle encoder 6, the X-axis position sensor 13 and the Y-axis position sensor 15 stored in the EEPROM 24 every predetermined time after the sewing operation based on the sewing data is completed. And the above calculation is performed.
If the processing time of the CPU 21 of the control device 20 of the sewing machine has a margin, the calculation may be performed during the sewing operation based on the sewing data.

  The operation time calculation unit 56, the speed calculation unit 57, and the operation start angle calculation unit 58 include the sewing data stored in the EEPROM 24 by the CPU 21 of the control device 20, and the X-axis position sensor 13 and the sewing operation in the sewing operation based on the sewing data. Calculation is based on the position of the moving mechanism 10 detected by the Y-axis position sensor 15 and the rotation angle of the main shaft 7 detected by the main shaft encoder 6. At this time, the position of the moving mechanism 10 detected by the X-axis position sensor and the Y-axis position sensor 15 is stored every predetermined time as the position of the moving mechanism 10 detected by the X-axis position sensor and the Y-axis position sensor 15. The position of the moving mechanism 10 of the EEPROM 24 as the second storage means is read. The rotation angle of the main shaft 7 detected by the main shaft encoder 6 reads the rotation angle of the main shaft 7 of the EEPROM 24 in which the rotation angle of the main shaft 7 detected by the main shaft encoder 6 is stored every predetermined time.

(Second storage means)
The second storage means 52 includes the spindle rotation angle of the spindle encoder, the position of the moving mechanism 10 by the X-axis position sensor 13 and the Y-axis position sensor 15, the operation time calculation means 56, the speed calculation means 57, and the operation start angle calculation means. 58 calculation results are stored. Specifically, the rotation angle of the main shaft 7 detected by the encoder 6 of the sewing machine motor 5 of the control device 20, the position of the moving mechanism 10 in the X-axis direction detected by the X-axis position sensor 13 of the X-axis motor 12, Y The position in the Y-axis direction of the moving mechanism 10 detected by the Y-axis position sensor 15 of the shaft motor 14 is stored in the EEPROM 24. Further, the settling time calculated by the CPU 21 of the control device 20, the rotational speed of the sewing machine motor 5 corresponding to the settling time, and the operation start angle θ are stored in the EEPROM 24. Therefore, the above-described EEPROM 24 functions as the second storage unit 52.
The rotational speed and operation start angle of the sewing machine motor 5 corresponding to the stored settling time are stored so that it can be identified which sewing data corresponds to the sewing data.

(Sewing control means)
The sewing control means 55 performs sewing based on each calculation result stored in the second storage means 52 at the time of sewing work using the sewing data.
That is, the sewing motor 5 is driven at the rotational speed based on the calculation result of the speed calculation means 57 during the sewing work using the sewing data, and the settling time and the operation start are calculated based on the calculation results of the operation time calculation means 56 and the operation start angle calculation means 58. The sewing mechanism is operated by operating the moving mechanism 10 according to the angle. As a result, once the sewing work is performed using the sewing data, the rotational speed of the sewing machine motor 5 calculated by the speed calculation means 57 based on the operation time of the moving mechanism 10 by the operation time calculation means 56 and the operation start angle. The sewing machine 1 can be operated based on the operation start angle of the moving mechanism 10 calculated by the calculating means 58.
The sewing control means 55 functions by reading the sewing data stored in the EEPROM 24 and the calculation results of the operation time calculation means, the speed calculation means, and the operation start angle calculation means into the CPU 21 of the control device 20 and processing them. .

(Display means)
FIG. 8 is an explanatory diagram illustrating an example of a display screen displayed on the operation panel display 4.
The operation panel display 4 has a moving mechanism calculated by the operating time calculating means 56, the vertical movement position of the needle bar at predetermined intervals based on the sewing speed of the sewing machine after the sewing motor rotational speed has been increased or decreased by the sewing control means 55. The movement mechanism position and the movement start time of the movement mechanism calculated by the movement start angle calculation means 58 for each predetermined time based on the time required for the movement are displayed in correspondence with each other. That is, as shown in FIG. 8, it is possible to visually grasp the correspondence between the vertical movement position of the needle bar 2 of the sewing machine 1, that is, the vertical movement position of the sewing needle 2a, and the operation of the moving mechanism 10 on the same time axis. It becomes possible. Accordingly, it is possible to visually grasp the effect of the calculation result of the rotational speed of the sewing machine motor by the speed calculation unit 57 and the operation start angle calculation unit 58 before the operation of the sewing machine. Therefore, the operation panel display 4 functions as a “display unit”.
The operation panel display 4 is in a state in which the operation time of the moving mechanism 10, the vertical movement position of the sewing needle 2 a based on the rotation speed of the sewing machine motor 5, and the operation start time of the moving mechanism 10 are associated on the same time axis. It functions by being displayed on the operation panel display 4 of the control device 20. Also in the PC 40, the needle bar is moved up and down at predetermined intervals based on the sewing speed of the sewing machine after the sewing motor rotational speed has been increased or decreased by the sewing control means 55 of the control device 20, and is calculated by the operating time calculation means 56. Similar to the operation panel display 4, the monitor 41 is read by reading the position of the moving mechanism every predetermined time based on the time required for the operation of the moving mechanism and the operation start time of the moving mechanism calculated by the operation start angle calculating means 58. Can be displayed.

(Machine operation)
Next, the operation of the sewing machine 1 will be described in detail.
The operation of the sewing machine 1 is selected when the main shaft rotation angle detected by the encoder 6 of the sewing machine motor 5 and the position of the moving mechanism 10 detected by the X-axis encoder 13 and the Y-axis encoder 15 are measured. Perform sewing operation. FIG. 9 is a diagram showing a sewing operation and a flow of operation when the measurement mode is selected. FIG. 10 is a diagram showing the processing contents of the measurement timer interrupt processing routine.
First, when the measurement mode is selected by the user (step S1), the sewing machine 1 detects the spindle rotation angle detected by the spindle encoder 6 and the X-axis encoder 13 and the Y-axis encoder 15 in addition to the normal sewing operation. It operates as a measurement mode for measuring the position of the moved moving mechanism 10. If the needle flow occurs when the sewing machine 1 is driven in the measurement mode, there is a possibility that the sewing needle 2a may be broken or a stitch having a deteriorated quality of the sewing product may be formed, resulting in waste of the sewing product. Performs the sewing operation without installing the sewing product.
Next, sewing data is selected by the operator via display and input on the operation panel display 4. After that, when the pedal 3 is operated by the operator (step S2), the control device 20 initializes stored data (step S3), further permits interruption of the measurement timer, and starts the operation of the measurement timer (step S3). Step S4). Thereafter, the sewing machine 1 starts a sewing operation based on the selected sewing data (step S5).

When the sewing operation in the measurement mode is started, an interrupt signal is generated every predetermined count cycle of the measurement timer, and the processing routine of the measurement timer interruption shown in FIG. 10 is executed. The spindle rotation angle detected by the spindle encoder 6 and the position of the moving mechanism 10 detected by the X-axis encoder 13 and the Y-axis encoder 15 are taken in, and the data and the measured count value are stored in the EEPROM 24 (step S6).
When the sewing operation based on the sewing data is finished (step S7), the control device 20 prohibits the interruption of the measurement timer and stops the operation of the measurement timer (step S8).
Thereafter, the CPU 21 of the control device 20 reads the spindle rotation angle and the position of the moving mechanism 10 and the measured count value stored in the EEPROM 24, and sets the moving mechanism 10 from the measured count value, the spindle rotating angle and the position of the moving mechanism 10. The time Ts, the maximum rotation speed N of the sewing machine motor 5 corresponding to the settling time Ts, and the operation start angle θstart of the moving mechanism 10 are calculated, and the rotation of the sewing machine motor 5 corresponding to the settling time Ts and the rotation speed N of the main shaft 7 is calculated. The speed and the operation start angle θstart are stored in the EEPROM 24 (step S9), and the measurement mode operation is terminated.

  After the operation in the measurement mode is completed, when the display of the calculation result is selected by the operation panel display 4 by the user, the CPU 21 of the control device 20 sets the settling time Ts, the rotation speed N of the spindle 7 and the operation start angle θstart. Correspondence between the vertical movement position of the corresponding sewing needle 2 a and the position of the moving mechanism 10 is displayed on the operation panel display 4.

  Thereafter, when a normal sewing mode is selected by the user and a sewing operation is performed based on the sewing data, sewing by the sewing control means 55 is performed. That is, the CPU 21 of the control device 20 performs a sewing operation for operating each part of the sewing machine 1 based on the maximum rotational speed N and the operation start angle θstart of the sewing machine motor 5 corresponding to the settling time Ts stored in the EEPROM 24. As a result, it is possible to perform a sewing operation based on the sewing data without causing problems such as deterioration in sewing quality and needle breakage due to needle flow.

(Effect of sewing machine according to the present invention)
According to the above-described embodiment, during the sewing operation based on the sewing data, the settling time Ts of the moving mechanism 10 calculated by the operation time calculating unit 56 and the rotational speed N of the spindle 7 calculated by the speed calculating unit 57 are supported. The rotation speed of the sewing machine motor 5 and the operation start angle calculated by the operation start angle calculation means 58 are stored in the second storage means 52.
Further, when a sewing operation is performed with the sewing data thereafter, the sewing control means 55 drives the sewing motor 5 at the rotational speed of the sewing machine motor 5 stored in the second storage means 52, and sets the settling time Ts and The moving mechanism 10 is operated according to the operation start angle θstart. Accordingly, the timing immediately after the sewing needle 2a is removed from the sewing product and the timing immediately before the sewing needle 2a is stuck in the sewing product are appropriately controlled in accordance with the settling time Ts of the moving mechanism 10. Accordingly, the movement of the moving mechanism 10 is performed before the timing immediately after the sewing needle 2a is removed from the sewing product, and the movement of the moving mechanism 10 is performed after the timing immediately before the sewing needle 2a is inserted into the sewing product. Nothing will happen. As a result, due to the needle flow in which the moving mechanism operates at the timing before the needle is removed from the sewing product, the sewing quality deteriorates due to deterioration of the sewing tightening, enlargement of the through hole of the sewing needle with respect to the sewing product, misalignment of the seam, etc. The problem can be solved. Therefore, the sewing quality is improved. In addition, it is possible to solve the problem that the sewing needle breaks due to the needle flow in which the moving mechanism operates at the timing after the needle has pierced the sewing product. Therefore, the reliability of the sewing machine is improved.
Further, as described above, the operation time calculation means 56 and the speed calculation means 57 automatically calculate an appropriate rotation speed of the sewing machine motor 5 corresponding to the movement of the sewing product by the operation of the movement mechanism 10, and the second Store in the storage means 52. As a result, in the prior art, the sewing speed setting of the sewing machine and the operation start angle of the moving mechanism for eliminating the needle flow of the sewing quality problem caused by the feeding of the moving mechanism, which was handled by the operator manually lowering the sewing speed of the sewing machine. Can be performed automatically. Therefore, it is possible to set the sewing speed for preventing needle flow and the operation start angle of the moving mechanism very easily and reliably as compared with the conventional case.
In addition, since the needle flow, which is a sewing quality problem due to the feed of the moving mechanism, is not given to the operator by the needle bar operation timing of the sewing machine and the response state of the moving mechanism, an effective solution can be found. In addition, the handling method can solve the problem that only the rotation speed of the sewing machine is changed, and the reliability of the sewing machine is improved. In addition, since the conventional technique relies on the operator's empirical rule for setting the sewing speed, it can solve the problem that has not become a general solution, and the reliability of the sewing machine is further improved. In addition, since the appropriate sewing speed is automatically calculated, the sewing machine must be operated several times until the sewing speed suitable for sewing is found in the conventional technique, which eliminates the time-consuming problem and Work preparation time is shortened and work efficiency is improved. In addition, it is possible to reduce costs associated with needle breakage and disposal of sewing products that may occur in trial sewing of a sewing machine performed until the proper sewing speed is found in the prior art.

  Further, the rotation angle of the main shaft 7 and the position of the moving mechanism 10 at the time of the sewing work based on the sewing data are stored in the EEPROM 24 every predetermined time. Therefore, the settling time Ts is calculated by the operation time calculation unit 56, the rotation speed of the sewing machine motor 5 corresponding to the rotation speed N of the main shaft 7 is calculated by the speed calculation unit 57, and the operation start angle θstart is calculated by the operation start angle calculation unit 58. It is possible to perform various types of calculation such as calculation after the sewing work is completed. That is, it is not necessary to perform calculation processing in real time for the various calculations. Therefore, even if the CPU 21 of the control device 20 does not have the performance of performing the calculation process in real time with respect to the position of the moving mechanism detected by the spindle encoder 6, the various calculations can be performed. That is, the performance requirement for the CPU 21 of the control device 20 can be set low, and the cost can be reduced.

  Further, the operation panel display 4 includes the vertical movement position of the sewing needle 2a based on the rotational speed of the sewing machine motor 5 corresponding to the rotational speed N of the main shaft 7 appropriately calculated with respect to the settling time Ts of the moving mechanism 10, and the operation. The operation is started at the start angle θstart, and the position of the moving mechanism 10 that operates at the settling time Ts is displayed in association with each other. Accordingly, it is possible to visually grasp the effect of preventing needle flow by the sewing control means 57 before sewing the sewing machine 1. Therefore, the operator can grasp the operation of the sewing machine 1 more clearly.

(Other)
In the above-described embodiment, the motion calculation means 56, the speed calculation means 57, and the motion start angle calculation means 58 function by calculation by the CPU 21 of the control device 20 of the sewing machine 1, but are performed by calculation by the external PC 40. Also good.
The monitor 41 in the above-described embodiment is the monitor 41 of the PC 40, but a dedicated display device may be used separately.

  The embodiment of the present invention is not limited to the sewing machine 1 in the above-described embodiment, and is a sewing machine in which a moving mechanism operates along a horizontal plane perpendicular to the vertical movement of the needle bar, and includes sewing data. Any sewing machine can be used as long as the sewing machine performs sewing by operating the moving mechanism.

The perspective view which shows the structure of the sewing machine by this invention. The block diagram which shows a control apparatus and the various structures connected to the control apparatus. The functional block diagram which shows the various function structures of a sewing machine. Explanatory drawing which showed the difference of the command position and detection position of a moving mechanism at the time of driving a sewing product with a moving mechanism. Note that POS is a position curve indicating the command position and detection position of the moving mechanism. ERR is a curve indicating the deviation between the command position of the moving mechanism and the detected position. 4 is an explanatory diagram showing a correspondence relationship between the vertical movement timing of the sewing needle and the operation timing of the moving mechanism when the rotational speed of the sewing machine motor is corrected with the same timing at which the sewing needle comes out of the sewing product. FIG. FIG. 5 (a) shows the sewing needle before the correction driven by the rotational speed of the sewing motor of the sewing data and after the correction driven based on the rotational speed of the sewing motor calculated by the speed calculation means. FIG. 5B is an explanatory diagram showing the correspondence between the vertical movement timing and the operation timing of the moving mechanism, and FIG. 5B is an enlarged explanatory diagram of a Z portion in FIG. It is explanatory drawing which shows a response | compatibility with the rotation angle of a main axis | shaft, and the vertical movement position of a sewing needle. The vertical movement of the sewing needle before the correction driven by the movement start angle of the moving mechanism driven by the sewing data and after the correction driven based on the movement start angle of the movement mechanism calculated by the movement start angle calculating means It is explanatory drawing showing the correspondence of a timing and the operation timing of a moving mechanism. It is explanatory drawing which shows an example of the display screen by an operation panel display. It is a figure which shows the flow of sewing operation and operation | movement when measurement mode is selected. It is a figure which shows the processing content of the process routine of a measurement timer interruption.

Explanation of symbols

5 sewing machine motor 6 spindle encoder 7 spindle 10 moving mechanism 12 X-axis motor 13 X-axis position sensor 14 Y-axis motor 15 Y-axis position sensor 20 controller 21 CPU
24 EEPROM
25 RS-232 port 40 PC
41 monitor 55 sewing control means 56 operation time calculation means 57 speed calculation means 58 operation start angle calculation means

Claims (3)

A needle bar that moves up and down in conjunction with the rotation of the main shaft by attaching a sewing needle,
A moving mechanism for moving the sewing product on a horizontal plane perpendicular to the vertical movement direction of the needle bar;
A sewing machine motor that rotates the spindle;
A driving motor for driving the moving mechanism;
Control means for controlling the drive motor;
First storage means for storing sewing data including a sewing pitch and the number of stitches of the seam to be applied to the sewing product and a rotation speed of the main shaft;
In a sewing machine that performs sewing by operating the needle bar and the moving mechanism based on the sewing pitch and the number of needles of the sewing data and the rotational speed of the main shaft,
First detecting means for detecting a rotation angle of the main shaft;
Second detection means for detecting the position of the moving mechanism;
When the moving mechanism is driven by the position command of the moving mechanism based on the sewing data, the rotation angle of the main shaft detected by the first detecting means and the second detecting means are detected every predetermined time. Second storage means for storing the position of the moving mechanism;
An operation time calculating means for calculating a required operation time of the moving mechanism from the position of the moving mechanism stored in the second storage means;
Speed calculating means for calculating the rotational speed of the sewing machine motor based on the calculation result of the required operation time by the operating time calculating means;
An operation start angle calculating means for calculating an operation start angle of the moving mechanism based on a position of the moving mechanism and a rotation angle of the main shaft;
The speed obtained when the sewing machine is driven based on the sewing data when operating the needle bar and the moving mechanism based on the sewing pitch and the number of needles of the sewing data and the rotation speed of the main shaft. Based on the calculation result of the rotation speed of the sewing machine motor by the calculation means and the calculation result of the operation start angle of the moving mechanism by the operation start angle calculation means obtained when the sewing machine was driven based on the sewing data previously. And a sewing control means for driving the sewing machine motor.   The needle bar vertical movement position for each predetermined time based on the rotational speed of the sewing machine motor calculated by the speed calculation means, and the movement for every predetermined time based on the required operation time of the moving mechanism calculated by the operation time calculation means. 2. The sewing machine according to claim 1, further comprising display means capable of displaying the position of the mechanism in correspondence with the operation angle time of the moving mechanism by the operation start angle calculation means. It has an interface that can be connected to an external computer,
Calculation of the time required for operation of the moving mechanism by the operation time calculating means, calculation of the rotational speed of the sewing machine motor by the speed calculating means, calculation of the operation start angle of the moving mechanism by the operation start angle calculating means, 3. The sewing machine according to claim 1, wherein the sewing machine is performed by the external computer connected via the interface.

Images