JP3822949B2 - Control method of needle bar cancellation mechanism in multi-head sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control method of a needle bar canceling mechanism which is provided in each sewing head of a multi-head sewing machine and pauses the vertical movement of the needle bar of each sewing head as necessary.
[0002]
[Prior art]
In a multi-head embroidery sewing machine, when an embroidery defect occurs in any embroidery head, embroidery processing in all embroidery heads is stopped and thread trimming is executed in all embroidery heads. Then, the embroidery frame goes back to the point where the embroidery defect occurred and the embroidery frame is returned (stitch back). The embroidery process is resumed. Here, since only the embroidery head that has become defective in embroidery is subjected to embroidery during repair sewing, the jump mechanism 110 for operating the embroidery is operated in other embroidery heads, and the vertical movement of the needle bar is stopped.
[0003]
As shown in FIG. 12, the conventional jump mechanism 110 includes an engaging element 112 that engages with an upper portion of the needle bar 111 and moves the needle bar 111 up and down, and an retracted position in which the engagement is disengaged. In some cases, a rotary solenoid 114 that is moved through an arm 113 is provided. FIG. 12 shows a state where the engaging element 112 is engaged with the upper end of the needle bar 111 by the bias of the spring 116 and the needle bar 111 can be driven up and down. When the rotary solenoid 114 is excited, the engaging element 112 that moves the needle bar 111 up and down is moved to the retracted position via the arm 113 and the pressing piece 115.
[0004]
[Problems to be solved by the invention]
However, if the excitation state of the rotary solenoid 114 is kept for a long time, the rotary solenoid 114 may be burned. Therefore, the conventional jump mechanism cannot keep the needle bar up and down for a long time, and repair sewing is not possible. It was limited to a predetermined number of stitches (for example, 800 stitches). For this reason, embroidery defects occur in large embroidery, and even when it is desired to carry out repair sewing over a predetermined number of stitches, it has not been possible to cope.
[0005]
Further, if the rotary solenoid 114 is continuously excited, power is consumed, and particularly in a multi-head embroidery sewing machine, power consumption increases in proportion to the number of embroidery heads.
[0006]
An object of the present invention is to solve the above-mentioned problems, and to provide a method for controlling a needle bar canceling mechanism in a multi-head sewing machine that can hold the pause state of the vertical movement of the needle bar without time limitation and has low power consumption for holding the pause state. It is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a control method for a needle bar canceling mechanism in a multi-head sewing machine according to the present invention is a needle bar canceling mechanism provided in each sewing head of a multi-head sewing machine, which engages with the needle bar and A rotary solenoid that moves an engaging element that moves the rod up and down by moving the arm from the engaging position to a retracted position that disengages the engagement, and a projecting portion protrudes from the rotating path of the arm. This is a method of controlling a needle bar canceling mechanism having a keep solenoid that holds the engaging element in the retracted position by holding the rotation in a stopped state, and pauses the vertical movement of the needle bar for a predetermined time or less. case, the holding said engager to the retracted position by energizing only rotary solenoid, when halting the vertical movement of the needle bar over a predetermined time, the rotary source After exciting the maytansinoid, a protrusion of the keep solenoid once energized to stop to protrude to the rotation path of the arm, from as the stop continues until energized again, the excitation of the rotary solenoid By holding the engaging element in the retracted position by stopping, it is possible to eliminate the need for electric power for maintaining the cancel state .
[0008]
Further, the control method of the needle bar canceling mechanism in the multi-head sewing machine of the present invention is a needle bar canceling mechanism provided in each sewing head of the multi-head sewing machine, wherein the needle bar canceling mechanism engages with the needle bar and moves the needle bar up and down. A rotary solenoid that moves the lever by moving the arm from the engagement position to the retracted position where the engagement has been disengaged, and a protruding portion projects into the rotation path of the arm, and the arm stops rotating. a method for controlling a needle bar canceling mechanism that includes a keep solenoid for holding the engager to the retracted position by holding the state, when halting the vertical movement of the needle bar, until a predetermined time the rotary holding the engager by energizing only the solenoid to the retracted position, once energized the keep solenoid in excitation of the rotary solenoid exceeds a predetermined time The projecting portion is projected on the rotating path of the arm is stopped Te, held from as the stop continues until energized again, the engager to the retracted position by stopping the excitation of the rotary solenoid This eliminates the need for electric power for maintaining the cancel state .
[0009]
Here, the “rotary solenoid” is an operation in which the movable iron core is actuated by excitation of the built-in coil to rotate the rotating shaft by a certain angle, and when the excitation is stopped, the rotating shaft is reversely rotated by the angle by the built-in spring. To do. The “keep solenoid” is a so-called bistable type latching solenoid that performs an operation in which the protruding portion protrudes and stops when excited once, and the protruding portion moves backward and stops when excited again.
[0010]
The “predetermined time” is not particularly limited as long as the rotary solenoid does not burn even if the rotary solenoid is continuously operated for the predetermined time. The method for measuring the “predetermined time” is not particularly limited as long as the time can be measured. In addition to the method of measuring the time itself with a timer or a clock, the method is measured in terms of the number of stitches when sewing. May be.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
1 to 10 show a control method of the needle bar canceling mechanism 7 in the multi-head embroidery sewing machine 1 according to the first embodiment. The embroidery sewing machine 1 is spaced on the sewing machine table 30 as shown in FIG. A plurality of embroidery heads 2 connected in series, an embroidery frame 31 placed on the sewing machine table 30 below the embroidery head 2, and an operation instruction to the embroidery sewing machine 1 on the right side of the sewing machine table 30. And an operation bar switch 35 disposed below the sewing machine table 30 and instructing to start or stop the embroidery processing of the embroidery sewing machine 1.
[0012]
As shown in FIGS. 1 and 2, each embroidery head 2 includes five needles 5 that can be changed in color, and five needle bars that are supported in a vertically movable manner and each needle 5 is fixed to the lower end. 4, a needle bar drive mechanism 6 that drives the selected one needle bar 4 up and down by the rotational force of the main shaft (not shown), and a needle bar cancellation mechanism 7 that pauses the vertical movement of the needle bar 4. Yes. Further, a thread path device 25 for applying tension to the upper thread 27 is provided above each embroidery head 2, and a thread breakage detector 23 for detecting thread breakage of the upper thread 27 is incorporated in the apparatus. Further, on the front face of the yarn path device 25, a cancel switch 9 for stopping the detection action by the yarn breakage detector 23 and stopping the vertical movement of the needle bar 4 and a stitch back for returning the embroidery frame 31 in reverse to the stitches. A switch 8 is provided.
[0013]
The needle bar drive mechanism 6 includes a guide bar 10 provided on the head frame 3 in parallel with the needle bar 4, an elevating body 11 provided so as to be movable up and down along the guide bar 10, and a main shaft (not shown). It comprises an elevating mechanism (not shown) that moves the elevating body 11 up and down by a rotational force. The elevating body 11 includes an engaging element 13 that engages with the engaging portion 12 of the needle bar 4, and the engaging element 13 has an engagement position that engages with the needle bar 4 and a retracted position that releases the engagement. The space is pivotally supported by a bolt 14 so as to be rotatable in a horizontal plane, and is biased toward the engagement position by a spring 15.
[0014]
As shown in FIG. 4, the needle bar canceling mechanism 7 includes a rotary solenoid 16 and a keep solenoid 17 provided in the head frame 3. A substantially intermediate position of the arm 19 is fixed to the rotary shaft 18 of the rotary solenoid 16, and the arm 19 is rotatable in a horizontal plane around the rotary shaft 18. A rod-shaped pressing piece 20 that presses the engagement element 13 is provided on one end side of the arm 19 so as to protrude downward. In the state shown in FIGS. 2 and 5, when the rotary solenoid 16 is excited to rotate the arm 19. The pressing piece 20 turns the engaging element 13 against the spring 15 and pivots the bolt 14 around the shaft 14 to move the engaging element 13 to the retracted position as shown in FIGS.
[0015]
Further, a keep solenoid 17 is provided on the side of the rotary solenoid 16 so as to face downward (or may face upward), and the protruding portion 21 of the arm 19 moves in a state where the arm 19 moves the engaging element 13 to the retracted position. It can project on the movement path | route of 19 counter-pressing pieces 20 side. As shown in FIGS. 3 and 6, when the protruding portion 21 protrudes downward, the arm 19 is held in a state where the rotation is stopped, and the engaging element 13 is held in the retracted position. Hereinafter, a state in which the engagement element 13 is in the retracted position is referred to as a cancel state.
[0016]
FIG. 7 shows the configuration of the control system of the multi-head embroidery sewing machine 1, and the controller 32 stored in the operation panel 33 controls the multi-head embroidery sewing machine 1. The controller 32 includes a CPU 36 (central processing unit). The CPU 36 is connected to a ROM 37 (read only memory) in which a control program for the multi-head embroidery sewing machine 1 is stored via a bus 49, and is used when the control program is executed. Is connected to a RAM 38 (read / write memory).
[0017]
Further, the CPU 36 includes the above-described operation panel 33, a floppy disk drive 40 for inputting / outputting embroidery data to / from the floppy disk 39, and a driver 42 for controlling a pulse motor 41 for driving the embroidery frame. , A driver 44 for controlling the motor 43 for driving the sewing machine spindle, a rotary encoder 45 for detecting the rotation angle of the spindle, and temporarily stopping the vertical movement of the needle bar 4 at the time of jump sewing, etc. A rotary solenoid 16, a keep solenoid 17 for holding the needle bar 4 in a resting state by the rotary solenoid 16, a stitch back switch 8 for returning the embroidery frame 31 against the stitches, and thread breakage A thread breakage detector 23 for detecting, a thread breaker 46 for controlling the thread trimming device 46 for cutting the upper thread 27 and the lower thread. A bar 47, operating rod switch 35 Doo like for instructing the embroidery start are connected via the respective interface 48 and the bus 49.
[0018]
A jump signal line 50 for embroidery processing in a normal state and a jump signal line 51 for embroidery processing for stitched back stitches are connected to the rotary solenoid 16 via an interface 48 via a cancel switch 9. Yes. When the cancel switch 9 is OFF, the jump signal line 50 is connected to the rotary solenoid 16, and when the cancel switch 9 is ON, the jump signal line 51 is connected.
[0019]
Next, processing of the embroidery sewing machine 1 while embroidery processing is stopped will be described based on the flowcharts of FIGS. FIG. 8 shows the flow of processing (step S60) when embroidery processing is stopped. First, the embroidery sewing machine 1 clears the content of the needle number counter (a variable whose area is secured in the RAM 38) to 0 (step). In step S61, the operation waits until an operation is performed (steps S62 to S64 are repeated). The operations at this time and the processing for the operations include the following.
[0020]
(1) When the stitchback switch 8 is turned on (step S62), the multi-head embroidery sewing machine 1 performs a stitchback operation while the switch is turned on (step S70, described later), and when the switch is turned off. Return to the state of waiting for the operation.
[0021]
(2) When the operation bar switch 35 is turned on (step S63), it is determined whether or not the stitch back is performed in step S70 depending on whether or not the content of the stitch number counter is greater than 0. Backed state) (step S65), a repair sewing process is executed (step S80, described later), and the process returns to the operation waiting state. If the content of the needle counter is 0 (state in which stitch back is not performed) (step S65), normal embroidery processing is started in all embroidery heads 2 (step S66), and the processing during embroidery processing stop is completed. (Step S67), the process proceeds to embroidery processing (not shown).
[0022]
(3) Other processing (step S64) includes, for example, when the operation panel 33 is operated and thread trimming is performed by the thread trimming device 46, or when the cancel switch 9 is turned on. Since the operation is not directly related, the description is omitted.
[0023]
Next, the stitchback process (step S70) will be described. As shown in the flowchart of FIG. 9, while the stitchback switch 8 is kept on (step S71), the process described below (steps S72 to S74). Is repeatedly executed and the stitchback switch 8 is turned off (step S71), the process is terminated and the process returns to the caller of the present process (step S75).
[0024]
As the processing to be repeatedly executed, first, the embroidery data for one stitch is read after the embroidery data to be read is returned by one stitch before (step S72). Based on the data, the embroidery frame 31 is returned (step S73), and the content of the needle number counter is incremented by 1 (step S74). In this way, while the stitch back switch 8 is being pressed, the embroidery frame 31 is moved back against the stitches, and the returned number of stitches is counted by the stitch number counter.
[0025]
Next, the repair sewing process (step S80) will be described. As shown in the flowchart of FIG. 10, first, in the embroidery head 2 in which the embroidery is not defective (hereinafter referred to as a normal embroidery head 2), In order to suspend the vertical movement, the rotary solenoid 16 is actuated to remove the engagement element 13 from the engagement with the engagement portion 12 and to cancel (step S81). If the value of the needle number counter is larger than 800, which is the predetermined number of stitches (step S82), in the normal embroidery head 2, the projecting portion 21 of the keep solenoid 17 is connected to the rotation path of the arm 19 during the operation of the rotary solenoid 16. (Step S83), the operation of the rotary solenoid 16 is stopped (step S84), and the canceled state is maintained.
[0026]
The predetermined number of stitches 800 is an example and is not limited to this. This value of 800 is the number of stitches converted from the time (predetermined time) when the rotary solenoid 16 is not burned even if the rotary solenoid 16 is continuously operated. Approximately equal time has elapsed. This predetermined number of stitches is appropriately changed according to a predetermined time.
[0027]
Then, until the content of the needle number counter becomes 0 (step S85), embroidery processing for repair described later is performed (steps S86 to S89 are repeated). When the content of the needle counter is 0 (step S85), it is checked whether the rotary solenoid 16 is activated in the normal embroidery head 2 (step S90). (Step S92), the process returns to the caller of this process (Step S80). If the rotary solenoid 16 is not operated (step S90), the keep solenoid 17 is retracted (step S91), and the process returns to the calling source (step S93).
[0028]
In the embroidery process for the repair (repeating steps S86 to S89), first, the embroidery data to be read is advanced by one stitch, and then the embroidery data for one stitch is read (step S86). The embroidery frame 31 is moved based on the data (step S87). In the embroidery head 2 in which the embroidery failure has occurred, the needle bar 4 is driven up and down by the needle bar drive mechanism 6 in accordance with this, and a stitch is formed (step S88), and the content of the needle number counter is decreased by one. (Step S89). In the normal embroidery head 2, the needle bar 4 is not driven because the needle bar canceling mechanism 7 is operated.
[0029]
Now, in the embroidery sewing machine 1 configured as described above, a series of operations for repairing thread breakage will be described. First, thread breakage occurs in any one of the embroidery heads 2, and embroidery processing in all embroidery heads 2 is performed. Is stopped, the operator performs thread trimming with all the embroidery heads 2 (step S64). Next, when the stitchback switch 8 is turned on with the thread embroidery head 2 (step S62), stitchback processing is started (step S70), and while the stitchback switch is turned on (step S71), the embroidery frame 31 is turned on. Is reversed and returned to the stitches (repetition of steps S72 to S74). Then, after the operator turns off the stitch back switch (step S75) and turns on the operation rod switch 35 (step S63), the repair sewing process is started (steps S65 and S80).
[0030]
Here, for example, if the content of the needle number counter is 500 which is equal to or less than the predetermined number of stitches, only the rotary solenoid 16 is operated in the normal embroidery head 2 and the cancel state is maintained (steps S81 and S82). When the cut embroidery head 2 is repaired with 500 stitches (repetition of steps S85 to S89) and the repair sewing is completed (step S85), the rotary solenoid 16 of the normal embroidery head 2 is stopped and the cancel state is released. (Steps S90, S92, S93).
[0031]
Further, for example, if the content of the needle number counter is 1000 stitches exceeding the predetermined number of stitches, in the normal embroidery head 2, the rotary solenoid 16 is once activated, the keep solenoid 17 is activated, and then the rotary solenoid 16 is activated. Is stopped and the canceled state is maintained (steps S81 to S84). Then, repair sewing is performed with the thread embroidery head 2 (repeat of steps S85 to S89), and when the repair sewing is completed (step S85), the keep solenoid 17 of the normal embroidery head 2 is retracted to cancel the cancel state. (Steps S91 and S93).
[0032]
When the operator turns on the operating rod switch again, the embroidery processing by all the embroidery heads 2 is resumed (steps S63, S65, S66, S67).
[0033]
According to the repair sewing method of the multi-head embroidery sewing machine 1 configured as described above, when the number of stitches exceeding the predetermined number converted from the predetermined time and the vertical movement of the needle bar 4 are stopped, the cancel state is canceled by the keep solenoid 17. Since it is held (steps S81, S82, S83, S84), there is no fear that the rotary solenoid 16 will be seized even when repair sewing is performed over multiple needles, and electric power is required to hold the canceled state. Absent.
[0034]
Further, when the number of stitches below the predetermined number is repaired, only the rotary solenoid 16 is operated (steps S81 and S82), so that the cancel state can be made faster.
[0035]
Next, the control method of the needle bar cancellation mechanism 7 in the multi-head embroidery sewing machine 1 according to the second embodiment will be described. This embodiment is different from the first embodiment only in that the repair sewing process (step S100) is changed. Yes.
[0036]
In the repair sewing process (step S100), as shown in the flowchart of FIG. 11, first, in the embroidery head 2 that is not defective in embroidery, the rotary solenoid 16 is operated to engage the engaging element 13 from the engaging portion 12. The combination is released and the cancel state is maintained (step S81). Then, “content of needle count−predetermined number of stitches (800 stitches)” is set in the number of keeping stitches (a variable whose area is secured in the RAM 38) (step S101).
[0037]
Then, until the content of the needle number counter becomes 0 (step S85), embroidery processing for repair described later is performed (steps S102 and S86 to S89 are repeated). When the content of the needle counter is 0 (step S85), it is checked whether the rotary solenoid 16 is activated in the normal embroidery head 2 (step S90). (Step S92), the process returns to the caller of this process (Step S80). If the rotary solenoid 16 is not operated (step S90), the keep solenoid 17 is retracted (step S91), and the process returns to the calling source (step S93).
[0038]
In the embroidery processing for the repair (repeating steps S102 and S86 to S89), first, it is checked whether the content of the needle number counter is equal to the number of keep needles (whether the embroidery processing has been performed for a predetermined number of stitches). (Step S102) If the embroidery head 2 is normal, the keep solenoid 17 is activated during the operation of the rotary solenoid 16 (Step S83), and then the operation of the rotary solenoid 16 is stopped (Step S84). Hold canceled state. Then, after the embroidery data to be read is advanced by one stitch, the embroidery data for one stitch is read (step S86), and the embroidery frame 31 is moved based on the data (step S87). In the embroidery head in which the embroidery failure has occurred, the needle bar 4 is driven up and down by the needle bar driving mechanism 6 in accordance with this, and a stitch is formed (step S88), and the content of the needle number counter is reduced by one. (Step S89).
[0039]
As described above, according to the control method of the needle bar canceling mechanism 7 in the multi-head sewing machine of the present embodiment, when the vertical movement of the needle bar 4 is stopped, only the rotary solenoid 16 is used until the number of repair sewing needles reaches the predetermined number. The cancel state is maintained by actuating (step S81), and when the predetermined number is exceeded (step S102), the keep solenoid 17 is actuated while the rotary solenoid 16 is actuated, and then the operation of the rotary solenoid 16 is stopped. Thus, the cancel state is held (steps S83 and S84).
[0040]
According to this embodiment, the same effect as that of the first embodiment can be obtained.
[0041]
In addition, this invention is not limited to the structure of the said embodiment, For example, as follows, it can also be changed and embodied suitably in the range which does not deviate from the meaning of invention.
(1) To shorten the predetermined time. That is, the predetermined number of repair sewing needles converted from the predetermined time is made smaller. Thereby, power consumption can be further reduced.
(2) The predetermined number of repair sewing needles converted from a predetermined time can be appropriately changed from the operation panel.
[0042]
【The invention's effect】
As described in detail above, according to the control method of the needle bar canceling mechanism in the multi-head sewing machine according to the present invention, it is possible to hold the pause state of the vertical movement of the needle bar without time limitation, and the power consumption for holding the pause state It is possible to obtain an excellent effect that is small.
[Brief description of the drawings]
FIG. 1 is a front view showing a multi-head embroidery sewing machine according to a first embodiment embodying the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view similar to FIG.
FIG. 4 is an exploded perspective view showing a needle bar canceling mechanism of the embroidery sewing machine.
5 is a cross-sectional view taken along line VV in FIG.
6 is a cross-sectional view taken along the line VI-VI in FIG. 3;
FIG. 7 is a block diagram showing a configuration of a control system of the multi-head embroidery sewing machine.
FIG. 8 is a flowchart showing processing during embroidery processing stop of the multi-head embroidery sewing machine;
FIG. 9 is a flowchart showing a stitchback process of the multi-head embroidery sewing machine.
FIG. 10 is a flowchart showing a repair sewing process of the multi-head embroidery sewing machine.
FIG. 11 is a flowchart showing a repair sewing process of a multi-head embroidery sewing machine according to a second embodiment embodying the present invention.
FIG. 12 is a partial plan sectional view showing a jump mechanism of a conventional embroidery sewing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-head embroidery machine 2 Embroidery head 4 Needle bar 7 Needle bar cancellation mechanism 13 Engagement element 16 Rotary solenoid 17 Keep solenoid 19 Arm 21 Protruding part S60 Processing during embroidery stop S70 Stitch back process S80 Repair sewing process S100 Repair sewing process

Claims (2)

A needle bar canceling mechanism provided in each sewing head of the multi-head sewing machine, wherein an engagement element (13) engaged with the needle bar (4) to move the needle bar up and down is engaged from the engagement position. The rotary solenoid (16) that moves by rotating the arm (19) to the retracted position, and the protruding portion (21) protrudes on the rotation path of the arm, and the rotation of the arm is stopped. a method for controlling a needle bar canceling mechanism that includes a keep solenoid (17) for holding the engager to the retracted position by holding,
When stopping the vertical movement of the needle bar (4) for a predetermined time or less, the engagement element (13) is held in the retracted position by exciting only the rotary solenoid (16),
When stopping the vertical movement of the needle bar (4) beyond a predetermined time, after exciting the rotary solenoid (16), the keep solenoid (17) is energized once and the protrusion (21) is moved to the arm ( projecting the rotational path 19) is stopped, since as the stop continues until energized again, the retracted position of the engaging elements (13) by stopping the excitation of the rotary solenoid (16) The needle bar canceling mechanism control method in the multi-head sewing machine is characterized in that the need for electric power for maintaining the canceled state is eliminated . A needle bar canceling mechanism provided in each sewing head of the multi-head sewing machine, wherein an engagement element (13) engaged with the needle bar (4) to move the needle bar up and down is engaged from the engagement position. The rotary solenoid (16) that moves by rotating the arm (19) to the retracted position, and the protruding portion (21) protrudes on the rotation path of the arm, and the rotation of the arm is stopped. a method for controlling a needle bar canceling mechanism that includes a keep solenoid (17) for holding the engager to the retracted position by holding,
When suspending the vertical movement of the needle bar (4), the engagement element (13) is held in the retracted position by exciting only the rotary solenoid (16) until a predetermined time,
When a predetermined time is exceeded, during the excitation of the rotary solenoid (16), the keep solenoid (17) is excited once, the protruding portion (21) is protruded into the rotation path of the arm (19) and stopped, and then excited again. Until the operation is continued, and then the excitation of the rotary solenoid (16) is stopped to hold the engagement element (13) in the retracted position, thereby maintaining the canceling state. A method for controlling a needle bar canceling mechanism in a multi-head sewing machine, characterized by eliminating the necessity .

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