JPH10325066A - Control of needle bar cancel mechanism multi-head sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a needle bar to be held suspended in its vertical motion for an infinite period of time. SOLUTION: In this method of controlling the needle bar cancel mechanism 7 provided with an engagement element 13 which engages with a needle bar to move the same in the vertical direction, a rotary solenoid 16 which moves the engagement element 13 from the engagement position to a retreated position of disengagement by rotating an arm 19, and a keep solenoid 17 which retains the engagement element 13 at the retreated position as a projection 21 projects into the rotational path of the arm 19 to hold the arm 19 motionless, when the vertical motion of the needle bar 4 is to be suspended for less than a predetermined period of time, the solenoid 16 alone is actuated and, after the solenoid 17 is actuated, the solenoid 16 is suspended to retain the engagement element at the retreated position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a needle bar canceling mechanism provided on each sewing head of a multi-head sewing machine and for stopping the vertical movement of the needle bar of each sewing head as required. is there.

[0002]

2. Description of the Related Art In a multi-head embroidery sewing machine, when an embroidery defect occurs in any one of the embroidery heads, the embroidery processing in all the embroidery heads is stopped and the thread trimming is executed in all the embroidery heads. Then, the embroidery frame is returned to the position where the embroidery defect has occurred, and the embroidery frame is returned (stitch back).
Repair stitching is performed for the stitched-back stitches of only the embroidery head in which the embroidery failure has occurred, and thereafter, embroidery processing with all embroidery heads is resumed. Here, during the repair sewing, only the embroidery head having an embroidery failure is embroidered, and the other embroidery heads have a jump mechanism 1 for skipping the eye.
10 is operated to stop the vertical movement of the needle bar.

A conventional jump mechanism 110 is shown in FIG.
As shown in FIG. 2, the needle bar 1
Some have a rotary solenoid 114 for moving, via an arm 113, an engagement element 112 for vertically moving the engagement element 11 between the engagement position and the retreat position where the engagement is released.
FIG. 12 shows a state in which 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]

However, if the excited state of the rotary solenoid 114 is maintained for a long time, the rotary solenoid 114 may be burned.
The conventional jump mechanism cannot keep the needle bar up and down in a resting state for a long time, and the repair sewing has a predetermined number of stitches (for example,
800 stitches). For this reason, embroidery failure occurs in large-size embroidery, and even when it is desired to perform repair sewing over a predetermined number of stitches, it has not been possible to cope with the problem.

Further, when the rotary solenoid 114 is continuously excited, power is consumed. In particular, in the case of a multi-head embroidery sewing machine, there is a problem that the power consumption increases in proportion to the number of embroidery heads.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and to provide a needle bar canceling mechanism in a multi-head sewing machine which can hold a halt state of vertical movement of a needle bar without time limit and consumes a small amount of power for holding the halt state. It is to provide a control method.

[0007]

In order to achieve the above object, a method of controlling 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 the multi-head sewing machine. A rotary solenoid that moves an engaging element that engages with the needle bar to move the needle bar up and down from the engagement position to a retreat position where the engagement is released, by rotating an arm; and rotation of the arm. A method for controlling a needle bar canceling mechanism including a keep solenoid for holding the engaging element at the retracted position by holding the arm in a state where the protrusion protrudes into the path and the rotation of the arm is stopped. To suspend the vertical movement of the needle bar,
By operating only the rotary solenoid, the engaging element is held at the retracted position, and when the vertical movement of the needle bar is suspended for a predetermined time or longer, the rotary solenoid is operated, and the keep solenoid is operated. Therefore, the operation of the rotary solenoid is stopped to hold the engagement element at the retracted position.

A method of controlling a needle bar canceling mechanism in a multi-head sewing machine according to the present invention is a needle bar canceling mechanism provided on each sewing head of the multi-head sewing machine. A rotary solenoid for moving the engaging element to be moved by rotating the arm from the engaged position to the retracted position where the engagement is released, and a protruding portion protruding from a rotating path of the arm to rotate the arm. In a method of controlling a needle bar canceling mechanism having a keep solenoid that holds the engaging element at the retracted position by holding the needle bar in a stopped state, when suspending vertical movement of the needle bar, a predetermined time is required. By operating only the rotary solenoid, the engaging element is held at the retracted position, and when a predetermined time is exceeded, the keep solenoid is operated during the operation of the rotary solenoid. After actuating the id, it characterized by holding the engager to the retracted position by stopping the operation of the rotary solenoid.

Here, the "rotary solenoid" is such that the movable iron core is actuated by the excitation of the built-in coil to rotate the rotating shaft by a fixed angle, and by stopping the excitation, the built-in spring reverses the rotating shaft by the angle. Perform a rotating operation. The “keep solenoid” is a so-called bistable latching solenoid that performs an operation of projecting and stopping a projection when excited once, and retracting and stopping the projection when excited once again.

The "predetermined time" is not particularly limited as long as the rotary solenoid is not seized even if the rotary solenoid is continuously operated. The method of measuring the “predetermined time” is not particularly limited as long as the method can measure the time. In addition to the method of measuring the time itself using a timer or a clock, the method is measured by converting the number of stitches during sewing. May be.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, FIGS.
1 shows a control method of the needle bar cancel mechanism 7 in the multi-head embroidery sewing machine 1 according to the first embodiment. As shown in FIG. 1, the embroidery sewing machine 1 has a large number of The embroidery head 2 and the embroidery frame 3 placed on the sewing machine table 30 below the embroidery head 2
Embroidery sewing machine 1 on the right side of the sewing machine table 30
An operation panel 33 for inputting an operation instruction to the sewing machine 1 and an operation bar switch 35 arranged below the sewing machine table 30 for instructing start or stop of embroidery processing of the embroidery sewing machine 1 are provided.

As shown in FIGS. 1 and 2, each embroidery head 2 has five needles 5 which can be changed in color and five embroidery heads which are supported so as to be movable up and down and are fixed at the lower ends thereof. A needle bar 4, a needle bar driving mechanism 6 for vertically driving one selected needle bar 4 by a rotating force of a main shaft (not shown), and a needle bar canceling mechanism 7 for stopping the vertical movement of the needle bar 4. It has. Above each embroidery head 2, a thread path device 25 for applying tension to the upper thread 27 is provided, and a thread break detector 23 for detecting a thread break of the upper thread 27 is built in the device. A cancel switch 9 for stopping the detection operation of the thread breakage detector 23 and for stopping the vertical movement of the needle bar 4 at the front of the thread path device 25, and a stitch back for returning the embroidery frame 31 backward to the seam. A switch 8 is provided.

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 vertically movable along the guide bar 10, and a main shaft (shown in the figure). (Not shown) and an elevating mechanism (not shown) for vertically moving the elevating body 11. The elevating body 11 includes an engaging element 13 that engages with the engaging portion 12 of the needle bar 4.
Is rotatably supported by a bolt 14 in a horizontal plane between an engagement position engaging with the needle bar 4 and a retreat position disengaged from the engagement, and is urged toward the engagement position by a spring 15. Have been.

As shown in FIG. 4, the needle bar canceling mechanism 7 includes a rotary solenoid 16 and a keep solenoid 17 provided on the head frame 3, respectively. A substantially intermediate position of an arm 19 is fixed to a rotary shaft 18 of the rotary solenoid 16, and the arm 19 is
Can be turned around a horizontal plane in the horizontal plane. At one end of the arm 19, a rod-shaped pressing piece 20 for pressing the engaging element 13 is projected downward, and in the state of FIGS.
Is rotated, the pressing piece 20 causes the engaging element 13 to rotate about the bolt 14 against the spring 15 to move the engaging element 13 to the retracted position as shown in FIGS. 3 and 6. ing.

A keep solenoid 17 is provided on the side of the rotary solenoid 16 downward (or upward), and the protrusion 21 has a state in which the arm 19 moves the engaging element 13 to the retracted position. , The arm 19 can protrude on the movement path on the side opposite to the pressing piece 20. As shown in FIGS. 3 and 6, when the projecting portion 21 projects downward, the arm 19 is held in a state where its rotation has stopped, and the engaging element 13 is thereby held at the retracted position. Hereinafter, a state in which the engagement element 13 is in the retracted position is referred to as a cancel state.

FIG. 7 shows a configuration of a control system of the multi-head embroidery sewing machine 1. The control of the multi-head embroidery sewing machine 1 is performed by a controller 32 stored in an operation panel 33.
The controller 32 includes a CPU 36 (central processing unit). The CPU 36 has, via a bus 49, a ROM 37 (read-only memory) in which a control program of the multi-head embroidery sewing machine 1 is stored. Is connected to a RAM 38 (read / write memory) used for the communication.

The CPU 36 has the above-mentioned operation panel 33, a floppy disk drive 40 for inputting and outputting embroidery data to and from a floppy disk 39,
A driver 42 for controlling a pulse motor 41 for driving an embroidery frame, a driver 44 for controlling a motor 43 for driving a main shaft of a sewing machine, a rotary encoder 45 for detecting a rotation angle of the main shaft, and jump sewing. In such a case, the rotary solenoid 16 for temporarily suspending the vertical movement of the needle bar 4, the keep solenoid 17 for maintaining the rest state of the needle bar 4 by the rotary solenoid 16, and the seam are reversed. A stitch back switch 8 for returning the embroidery frame 31, a thread break detector 23 for detecting a thread break, a driver 47 for controlling a thread cutting device 46 for cutting the upper thread 27 and the lower thread, An operation bar switch 35 for instructing the start of embroidery is connected to each interface 48 via a bus 49.

The rotary solenoid 16 has a jump signal line 50 for embroidering in a normal state and a jump signal line 51 for embroidering a stitch-backed stitch from the interface 48 via the cancel switch 9. It is connected. Cancel switch 9 is O
In the case of FF, 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.

Next, the processing of the embroidery sewing machine 1 while the embroidery processing is stopped will be described with reference to the flowcharts of FIGS. FIG. 8 shows processing during embroidery processing stop (step S6
First, the embroidery sewing machine 1 clears the stitch number counter (variable for which an area is secured in the RAM 38) to 0 (step S61). It becomes a waiting state (steps S62 to S62).
S64 is repeated. ). The operation at this time and the processing for the operation include the following.

(1) When the stitch back switch 8 is turned on (step S62), the multi-head embroidery machine 1 performs a stitch back operation while the switch is on (step S70, described later), and the switch is turned off. Then, the operation returns to the operation waiting state.

(2) When the operation bar switch 35 is turned on (step S63), it is determined whether or not the stitch-back state has been performed in step S70 based on whether or not the content of the stitch number counter is greater than zero. If (stitched back state) (step S65), the repair sewing process is executed (step S80, described later), and the operation returns to the operation waiting state. If the content of the hand counter is 0 (a state in which stitch back is not performed) (step S65),
In all the embroidery heads 2, the normal embroidery processing is started (step S66), the processing while the embroidery processing is stopped is ended (step S67), and the processing is shifted to the processing during the embroidery processing (not shown).

(3) As other processing (step S64), for example, the operation panel 33 is operated and the thread cutting device 4
6, when the cancel switch 9 is turned on, and the like. However, since the operation is not directly related to the present invention, the description is omitted.

Next, a stitch-back process (step S7)
9), as shown in the flowchart of FIG. 9, while the stitch-back switch 8 is kept ON (step S71), the processing described below (steps S72 to S74) is repeatedly executed to execute the stitch-back switch. When 8 is turned off (step S71), the process is terminated and the process returns to the calling source of the process (step S75).

First, after the embroidery data to be read is returned one stitch before,
The embroidery data for one stitch is read (step S72). Then, the embroidery frame 31 is returned based on the data (step S73), and the content of the stitch counter is incremented by 1 (step S74). In this way, while the stitch back switch 8 is being pressed, the embroidery frame 31 is returned in a reverse direction to the stitch, and the returned stitch number is counted by the stitch number counter.

Next, the repair stitching process (step S80) will be described. As shown in the flowchart of FIG. 10, first, the needle is used in the embroidery head 2 having no embroidery defect (hereinafter, referred to as a normal embroidery head 2). In order to suspend the vertical movement of the rod 4, the rotary solenoid 16 is operated, so that the engagement with the engagement portion 12
3 is removed and the state is canceled (step S81).
If the content of the stitch number counter is larger than the predetermined number of stitches of 800 (step S82), the normal embroidery head 2
In step S83, the protruding portion 21 of the keep solenoid 17 is made to protrude into the rotation path of the arm 19 during the operation of the rotary solenoid 16 (step S83), and then the operation of the rotary solenoid 16 is stopped (step S8).
4) Hold the cancel state.

The above-mentioned predetermined number of stitches, 800, is merely an example and is not limited to this. This value of 800 is
Time during which the rotary solenoid 16 is not seized even if the rotary solenoid 16 is continuously operated (predetermined time)
The number of stitches is converted from the number of stitches. When the predetermined number of stitches is embroidered, a time substantially equal to the predetermined time elapses. The predetermined number of stitches is appropriately changed according to a predetermined time.

Until the value of the stitch number counter becomes 0 (step S85), embroidery processing for repair described later is performed (steps S86 to S89 are repeated). Then, when the content of the stitch number counter becomes 0 (step S8).
5) In the normal embroidery head 2, it is checked whether or not the rotary solenoid 16 is operated (step S90). If it is operated, the rotary solenoid 16 is stopped (step S92), and this processing (step S80). Return to the caller of. Rotary solenoid 16
If is not activated (step S90), the keep solenoid 17 is retracted (step S91), and the process returns to the calling source (step S93).

In the embroidery processing for repair (repetition of steps S86 to S89), first, the embroidery data to be read is advanced by one stitch, and then the embroidery data of one stitch is read (step S86). ), The embroidery frame 31 is moved based on the data (step S87). Then, in the embroidery head 2 in which the embroidery defect has occurred, the needle bar 4 is driven up and down by the needle bar drive mechanism 6 to form a stitch (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 cancel mechanism 7 is activated.

The embroidery sewing machine 1 constructed as described above will now be described.
In the following, a series of operations for repairing a thread break will be described. First, when a thread break occurs in any one of the embroidery heads 2 and the embroidery processing in all the embroidery heads 2 is stopped,
The operator performs thread cutting with all the embroidery heads 2 (step S64). Next, the stitch back switch 8 is turned on with the embroidery head 2 having the thread broken (step S6).
2), stitch back processing is started (step S7)
0) While the stitch back switch is ON (step S71), the embroidery frame 31 is returned to the seam in a reverse direction (repetition of steps S72 to S74). Then, after the operator turns off the stitch back switch (step S75) and turns on the driving rod switch 35 (step S63), the repair sewing process is started (step S6).
5, S80).

Here, for example, if the content of the stitch number counter is 500, which is equal to or less than the predetermined number of stitches, in the normal embroidery head 2, only the rotary solenoid 16 is operated and the cancel state is maintained (steps S81 and S8).
2) The repair stitch of 500 stitches is performed by the broken embroidery head 2 (repetition of steps S85 to S89). When the repair sewing is completed (step S85), the rotary solenoid 16 of the normal embroidery head 2 is stopped. The cancel state is released (steps S90, S92, S9
3).

If, for example, the content of the stitch number counter is 1000 stitches exceeding a predetermined stitch number, the rotary solenoid 16 is operated once in the normal embroidery head 2, the keep solenoid 17 is operated, and then the rotary solenoid is operated. The operation of Step 16 is stopped, and the cancel state is maintained (Steps S81 to S84). Then, repair sewing is performed by the embroidery head 2 having the broken thread (step S8).
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).

Then, the operator again sets the driving rod switch to O.
If N, embroidery processing by all embroidery heads 2 is restarted (steps S63, S65, S66, S67).

According to the repair sewing method of the multi-head embroidery sewing machine 1 configured as described above, when the number of needles exceeding the predetermined number converted from the predetermined time and the vertical movement of the needle bar 4 are stopped, the keep solenoid 17 is used. Since the cancel state is maintained (steps S81, S82, S83, S83).
84) Even when the repair sewing is performed over multiple stitches, there is no possibility that the rotary solenoid 16 is seized, and no electric power is required for maintaining the canceled state.

When the number of stitches less than the predetermined number is to be repaired, only the rotary solenoid 16 is operated (steps S81 and S82).

Next, a control method of the needle bar cancel mechanism 7 in the multi-head embroidery sewing machine 1 according to the second embodiment will be described.
(00) is different from the first embodiment.

In the repair sewing process (step S100),
As shown in the flowchart of FIG. 11, first, in the embroidery head 2 in which the embroidery is not defective, the rotary solenoid 16 is operated to release the engagement of the engagement element 13 from the engagement portion 12 and maintain the canceled state ( Step S81). Then, “contents of the stitch count−predetermined number of stitches (800 stitches)” is set as the number of stitches to be kept (a variable for which an area is secured in the RAM 38) (step S10).
1).

Until the value of the stitch 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 stitch number counter becomes 0 (step S85), it is checked whether or not the rotary solenoid 16 is operated in the normal embroidery head 2 (step S90), and if it is operated, the rotary solenoid 16 is stopped. Then, the process returns to the calling source of the process (step S80) (step S92). If the rotary solenoid 16 is not operated (step S90),
The keep solenoid 17 is retracted (step S9).
1) Return to the calling source (step S93).

In the embroidery processing for the repair (steps S102, S86 to S89 are repeated), first, it is determined whether or not the content of the stitch number counter has become equal to the number of keep stitches (whether or not the embroidery processing has been performed with a predetermined number of stitches). ) Is checked (step S102), and if they are equal, the normal embroidery head 2
In step, after the keep solenoid 17 is operated while the rotary solenoid 16 is operating (step S83),
The cancellation state is maintained by stopping the operation of the rotary solenoid 16 (step S84). After the embroidery data to be read is advanced by one stitch, the embroidery data of one stitch is read (step S86).
The embroidery frame 31 is moved based on the data (step S87). In the embroidery head in which the embroidery defect has occurred, the needle bar 4 is driven up and down by the needle bar drive mechanism 6 to form a stitch (step S88), and the content of the needle number counter is decreased by one. (Step S8
9).

As described above, according to the control method of the needle bar cancel mechanism 7 in the multi-head sewing machine of the present embodiment, the needle bar 4
When the up and down movement is stopped, the canceled state is maintained by operating only the rotary solenoid 16 until the number of repair stitches reaches the predetermined number (step S81).
If the number exceeds the predetermined number (step S102), the keep solenoid 17 is operated during the operation of the rotary solenoid 16, and then the operation of the rotary solenoid 16 is stopped to maintain the cancel state (step S102).
83, S84).

According to this embodiment, the same effects as those of the first embodiment can be obtained.

Note that the present invention is not limited to the configuration of the above-described embodiment, and can be embodied by appropriately changing the scope of the invention as follows, for example, as follows. (1) To shorten the predetermined time. That is, the predetermined number of the repair stitches converted from the predetermined time is made smaller.
As a result, power consumption can be further reduced. (2) The predetermined number of the repair stitches converted from the predetermined time can be appropriately changed from the operation panel.

[0042]

As described above in detail, according to the control method of the needle bar canceling mechanism in the multi-head sewing machine according to the present invention, the suspended state of the vertical movement of the needle bar can be maintained without any time limit.
An excellent effect that the power consumption for maintaining the dormant state is small can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a multi-head embroidery sewing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view similar to FIG. 2;

FIG. 4 is an exploded perspective view showing a needle bar cancel mechanism of the embroidery sewing machine.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of 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 a process during embroidery processing of the multi-head embroidery sewing machine is stopped.

FIG. 9 is a flowchart showing a stitch-back 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 the multi-head embroidery sewing machine according to the second embodiment of 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 sewing machine 2 Embroidery head 4 Needle bar 7 Needle bar cancel mechanism 13 Engager 16 Rotary solenoid 17 Keep solenoid 19 Arm 21 Projection part S60 Processing while embroidery processing is stopped S70 Stitch back processing S80 Repair sewing processing S100 Repair sewing processing

Claims (2)

[Claims] 1. A needle bar cancel mechanism provided on each sewing head of a multi-head sewing machine, wherein an engagement element that engages with a needle bar and moves the needle bar up and down is disengaged from the engagement position. The armature is moved by rotating the arm to the retracted position, and the protrusion is projected on the rotation path of the arm, and the arm is retracted by holding the arm in a stopped state. A method for controlling a needle bar canceling mechanism having a keep solenoid for holding the needle in a position, wherein when the vertical movement of the needle bar is suspended for a predetermined time or less, the engagement element is moved to the retracted position by operating only the rotary solenoid. When the vertical movement of the needle bar is suspended for a predetermined time, the rotary solenoid is operated, the keep solenoid is operated, and then the low The method of the needle bar canceling mechanism in multi-head sewing machine, characterized by holding the engager to the retracted position by stopping the operation of Lee solenoid. 2. A needle bar cancel mechanism provided on each sewing head of a multi-head sewing machine, wherein an engaging element that engages with the needle bar and moves the needle bar up and down is disengaged from the engaging position. The armature is moved by rotating the arm to the retracted position, and the protrusion is projected on the rotation path of the arm, and the arm is retracted by holding the arm in a stopped state. A method for controlling a needle bar canceling mechanism having a keep solenoid for holding the needle in a position, wherein when the vertical movement of the needle bar is suspended, the retractor retracts the engagement element by operating only the rotary solenoid until a predetermined time. Position, and when a predetermined time is exceeded, the keep solenoid is operated during the operation of the rotary solenoid, and then the operation of the rotary solenoid is stopped. The method of the needle bar canceling mechanism in multi-head sewing machine, characterized by holding the engager to the retracted position by.