JP3425059B2 - Presser foot device for pattern sewing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot device for a pattern sewing machine, and more particularly, to a presser foot that can be switched by an operating lever and can also be raised by a stepping motor.

[0002]

2. Description of the Related Art A presser foot device for a pattern sewing machine including an embroidery sewing machine usually has a presser foot that is supported by a main body frame so as to be able to move up and down, and the presser foot is placed in an ascending position and a descending position. Operation lever for switching operation with
The presser foot is provided with a spring member for urging the presser foot to the descending side, and during sewing, the presser foot is reciprocally driven up and down by a small stroke in coordination with the cloth feed at the lowered position. When exchanging the cloth holding frame that holds the work cloth, when checking the sewing start position of the work cloth held in the cloth holding frame, or when the thread breaks, operate the operating lever manually to release the work clamp foot. The presser foot is switched to the raised position, and the presser foot is switched to the lowered position by manually operating the operating lever at the start or restart of sewing.

Conventionally, a presser foot device provided with a solenoid actuator capable of raising and lowering the presser foot in addition to the operation lever has been put into practical use so that the position of the presser foot can be switched not only by manual operation but also by automatic operation. Has been done.

[0004]

In a presser foot device provided with a solenoid actuator capable of raising and lowering the presser foot in addition to the operation lever for changing the position of the presser foot, the solenoid actuator is expensive. There is a problem that a collision noise is generated when the solenoid actuator is operated. Therefore, the applicant of the present application is developing a presser foot device of a pattern sewing machine in which a presser foot can be lifted and driven by a stepping motor instead of a solenoid actuator. In the presser foot device, the stepping motor is operated by an operating lever. Are connected to each other through a control lever so that at least the presser foot can be driven upward, and when the presser foot is in the raised position, the stepping motor holds the excited state of the excitation phase for holding the presser foot in that position. To be done.

However, in this presser foot device, since the stepping motor is operatively connected to the operation lever,
There is a problem that when the presser foot is manually moved up and down via the operation lever, mutual interference with the stepping motor occurs. However, it is also possible to provide a mode setting switch for setting the manual mode and allow the manual operation only in the manual mode, but it is preferable because the operation system becomes complicated and the number of times of operating the switch increases. Absent.

Further, even when the stepping motor is controlled so that mutual interference between the operation lever and the stepping motor does not occur, when the presser foot is manually raised to switch to the raised position, the raised position is reached. When the stepping motor is excited at the moment, the stepping motor may rotate forward or backward by about 1/2 step, which causes an uncomfortable feeling in the operator's hand and deteriorates the operation feeling. An object of the present invention is to enable a presser foot to be lifted and driven by a stepping motor in a presser foot device of a pattern sewing machine, to prevent interference between an operation lever and a stepping motor, and to manually operate the operation lever. This is to prevent the operation feeling from deteriorating.

[0007]

A presser foot device for a pattern sewing machine according to a first aspect of the present invention is a presser foot which is supported by a sewing machine body frame so as to be able to move up and down through a presser bar, and the presser foot is raised and lowered. In the presser foot device of the pattern sewing machine, which has an operation lever for switching operation and a spring member for urging the presser foot to the lower side, the presser foot is raised via the presser foot or the operation lever. Position detecting means, a stepping motor operatively connected to the presser foot to drive the presser foot at least upwardly, and a stepping motor which receives a detection signal from the detecting means and which receives an elevating command from the outside. And a control means for controlling the stepping motor so as to allow the lifting and lowering of the presser foot by the manual operation of the operation lever.
When manually lowering the work clamp from its raised position
In addition, the control means releases the excitation of the stepping motor.
And hold the release while the presser foot is in the lowered position
It is characterized by doing .

The pattern sewing machine means an embroidery sewing machine, a sewing machine for sewing various patterns other than the embroidery pattern, and the like. The detection means detects that the presser foot is in the raised position via the presser foot or the operation lever, and the stepping motor is operatively connected to the presser foot so that the presser foot can be driven at least upwardly. The control means receives the detection signal of the detection means, controls the stepping motor in response to an elevation command signal from the outside, and controls the stepping motor to permit the elevation of the presser foot by the manual operation of the operation lever. Therefore, when an ascending command is received from the outside, the control means drives the stepping motor to raise the presser foot, and when a descending command is received from the outside, the control means lowers the presser foot by releasing the excitation of the stepping motor. Even by manual operation, the presser foot can be raised and lowered without interfering with the stepping motor. And
Since the presser foot is biased downward by the spring member,
When the excitation of the topping motor is released, the biasing force of the spring member
Causes the presser foot to descend to the lowered position. When in the lowered position
In order to maintain the de-energization of the stepping motor,
The presser foot is moved up and down by another drive system in synchronization with the sewing machine motor.
Then, sewing can be performed.

A presser foot device for a pattern sewing machine according to a second aspect of the present invention is the presser foot device according to the first aspect of the present invention, wherein the stepping motor is operatively connected to the presser foot via an operating lever. In this case, since the stepping motor is operatively connected to the presser foot through the operation lever, the stepping motor is driven to move the presser foot up and down between the up position and the down position through the operation lever. You can Other than that, the same operation as in claim 1 is achieved.

A presser foot device for a pattern sewing machine according to a third aspect of the present invention is the presser foot device according to the first or second aspect of the present invention, wherein when the control means raises the presser foot from a lowered position by a stepping motor in response to an upward command. The exciting phase of the stepping motor at the time of detecting the rising position of the presser foot by the detecting means is detected, and the exciting phase is stored in the memory as a detected exciting phase.

In this case, when the stepping motor raises the presser foot from the lowered position in response to the rising command, the control means sets the excitation phase of the stepping motor at the time of detecting the raised position of the presser foot by the detecting means. Since the detected excitation phase is stored in the memory as the detected excitation phase, the stored detected excitation phase is used smoothly when the presser foot is raised by manual operation or when it is automatically raised by the raising command. It can be stopped at the same elevated position. Furthermore,
Each time the presser foot is raised by the stepping motor, the detection excitation phase of the stepping motor is updated and stored each time, so even if the detection excitation phase shifts due to mechanical wear of the presser foot device, The optimum detection excitation phase can be stored in the position where the foot is raised. In addition, the same operation as that of claim 1 or 2 is achieved.

According to a fourth aspect of the invention, there is provided a presser foot device for a pattern sewing machine according to the invention of claim 3, wherein the control means advances the stepping motor by a predetermined step from the detection excitation phase when the presser foot is in a raised position. The phase is kept in the excited state. In this case, the control means holds the stepping motor in the excited state of the predetermined excitation phase which is advanced by a predetermined step from the detection excitation phase when the presser foot is in the raised position. The lifted position of the presser foot can be reliably detected, and when the presser foot is in the raised position, the stepping motor is held in the excited state of the predetermined excitation phase, so the presser foot is urged downward by the spring member. Even if the presser foot is held, the presser foot can be held in the raised position. Other than that, the same operation as in claim 3 is achieved.

[0013]

A presser foot device for a pattern sewing machine according to a fifth aspect of the present invention is the presser foot device according to the fourth aspect of the invention, wherein when the operating lever is manually operated to elevate the presser foot from the lowered position, the control means operates by a detection means. The stepping motor is excited and held in the first predetermined excitation phase after the raised position of the presser foot is detected. Therefore, when the presser foot stops at the raised position,
Since the step does not rotate normally or reversely and the operator's hand does not feel uncomfortable, the operation feel is improved. Other than that, the same operation as in claim 3 is achieved.

A presser foot device for a pattern sewing machine according to a sixth aspect of the present invention is the presser foot device according to the first or second aspect of the present invention, wherein when the control means lowers the presser foot in the raised position in response to a lowering command. It is characterized in that the excitation is released and the release is held while the presser foot is in the lowered position. Since the presser foot is biased downward by the spring member, the presser foot is lowered to the lowered position when the excitation of the stepping motor is released. Since the excitation release of the stepping motor is held in the lowered position, the presser foot can be vertically driven by another drive system in synchronization with the sewing machine motor during sewing to perform sewing. In addition, the same operation as that of claim 1 or 2 is achieved.

A presser foot device for a pattern sewing machine according to a seventh aspect of the present invention is the presser foot device according to the fourth or fifth aspect , wherein the control means detects the means when raising the presser foot in the lowered position in response to an ascending command. The stepping motor is excited and held in the first predetermined excitation phase after the raised position of the presser foot is detected by. Therefore, it is possible to stop and hold the presser foot at the same lifted position both when the presser foot is manually raised and when automatically raised by the lift command. In addition, the same operation as in claim 4 or 5 is achieved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-head embroidery sewing machine including three embroidery sewing machines.

The multi-head embroidery sewing machine M will be described. As shown in FIG. 1, a sewing machine having a substantially rectangular shape in plan view having a predetermined length in the left-right direction is provided on the rear side of the upper surface of the base frame 1 extending in the left-right direction. A support plate 2 is provided, and a support frame 3 extending in the left-right direction is provided upright on the rear end portion of the sewing machine support plate 2, and three head portions 4 to 6 are provided on the support frame 3 at predetermined intervals. The base frame 1 which is arranged in parallel in the left-right direction and is located at the front end portion of the sewing machine support plate 2 corresponds to each of the head portions 4 to 6 and the rear end of each of the cylindrical bed portions 7 to 9. Each department is supported,
Three multi-needle type embroidery sewing machines M1 to M3 including the head portions 4 to 6 and the bed portions 7 to 9 are arranged in parallel.

The head portion 4 of these embroidery sewing machines M1 to M3
At the front end of each of ~ 6, twelve needle bars 21 arranged in a row in the left-right direction are supported in a vertically movable manner, and
Needle bar case 20 that swingably supports twelve balances 23
Are movably supported in the left-right direction, and the needle bar cases 20 are simultaneously moved in the left-right direction by a needle bar changing mechanism (not shown) driven by a needle bar changing motor 79 (see FIG. 5). It is possible to change to another needle thread of different thread color at the same time. By the way, in each of the beds 7-9, a full-rotary hook for timing the up-and-down movement of a sewing needle 22, which will be described later, to capture the thread loop of the upper thread, and a thread cutting mechanism for cutting the upper thread and the lower thread (illustrated). Is omitted).

On the other hand, on the front side of the sewing machine support plate 2, a work table 13 is horizontally arranged so as to be flush with the upper surfaces of the beds 7 to 9, and the work table 13 is included. 1 provided on both left and right sides of the work table 13
A movable frame 16 having a rectangular frame shape in plan view extending in the left-right direction is placed over the pair of auxiliary tables 14 and 15. Then, the drive frame portion 16a at the right end of the movable frame 16 is moved and driven in the X axis direction (horizontal direction) by the X axis drive mechanism (not shown), and the drive frame portion 16b and the drive frame portion at the left end thereof are driven. 16a and 16a are moved and driven in the Y-axis direction (front-back direction) by a Y-axis drive mechanism (not shown).

Therefore, the movable frame 16 includes the X-axis drive motor 8
The X-axis drive mechanism driven by 1 (see FIG. 5) and the Y-axis drive mechanism driven by the Y-axis drive motor 83 (see FIG. 5) can move on the XY plane. Further, on the rear side of the auxiliary table 15, there is provided an operation panel 18 including a display for displaying a message regarding embroidery sewing and various function switches. Next, a needle bar drive mechanism 25 that is provided for each of the embroidery sewing machines M1 to M3 and that drives the needle bar 21 up and down will be briefly described with reference to FIG.

A base needle bar 26 extending in the vertical direction is provided at the tip of each of the head sections 4 to 6, and the base needle bar 26 is supported by the body frame at its upper end and lower end. A vertically moving member 27 having an engaging groove 27a that engages with a connecting pin 34, which will be described later, is vertically movably inserted into the base needle bar 26, and the needle bar is provided at the lower end of the vertically moving member 27. The body 28 is vertically movably and non-rotatably fitted into the base needle bar 26, and the vertically movable member 27 is rotatably connected to the lower end of the vertically movable member 27. The needle bar holder 28 is connected to a link 31 that is connected to a swing lever 30 that is swingably supported by a pivot shaft 29.

On the other hand, an eccentric cam 32 is fixedly attached to a main shaft 17 which is inserted in the respective head portions 4 to 6 and arranged in the left-right direction, and an eccentric lever 33 externally fitted to the eccentric cam 32.
The lower end of the is connected to the swing lever 30. By the way, a sewing needle 22 is attached to the lower end of each of the twelve needle bars 21, and a connecting pin 34 is fixed to each of the intermediate pins in the height direction. A compression coil spring 35 is externally fitted between the needle bar case 20 and the frame, and the needle bar 21 is always elastically biased to the upper needle position by the compression coil spring 35. Further, when the needle bar case 20 is moved in the left-right direction, the connecting pin 34 of the needle bar 21 facing the up-and-down moving member 27.
Are selectively engaged with the engaging grooves 27a of the vertically moving member 27.

As a result, the main shaft 17 is rotated by the rotational driving of the sewing machine motor 110 in the predetermined rotation direction, and the eccentric lever 33, the swing lever 30, and the link 31 are used.
As the vertical moving member 27 and the needle bar holder 28 move up and down integrally, only the needle bar 21 connected to the vertical moving member 27 through the connecting pin 34 is adjusted to the main shaft 17 to move up and down. Is driven back and forth. Next, a needle bar jump mechanism 40 that is provided for each of the embroidery sewing machines M1 to M3 and that causes the needle bar 21 to jump to its uppermost position (top dead center position) will be described with reference to FIG. In the needle bar case 20, a horizontally oriented needle bar jump solenoid 41 is provided, and a rotary lever 42 having a substantially L shape in plan view is attached to the needle bar case 20 so as to be rotatable around a vertical axis. There is. The drive portion 42a of the rotating lever 42 abuts on the plunger of the needle bar jump solenoid 41, and the driven portion 4a of the driven portion 4a.
The vertical operation shaft 43 attached to 2b can be engaged with a protruding engagement portion 27b integrally formed with the vertical movement member 27.

Further, the vertically moving member 27 is always elastically attached by the winding spring 44 provided at the upper end thereof so as to rotate from the rotated jump position shown by the two-dot chain line to the normal connecting position shown by the solid line. It is energized. As a result, when the needle bar 21 is connected to the vertical movement member 27 via the connecting pin 34, the needle bar jump solenoid 41 is driven for a predetermined time, and when the plunger advances to the right, The rotation lever 42 rotates clockwise in a plan view, and the vertical movement member 27 rotates to the jump position indicated by the chain double-dashed line via the operation shaft 43 and the engaging portion 27b to be connected. The engagement between the pin 34 and the engagement groove 27a is released, and at the same time, the needle bar 21 is moved (jump operation) to the needle up position at once by the compression coil spring 35.

On the other hand, when the needle bar 21 jumps to the needle up position and the vertical moving member 27 is returned to the connecting position, the vertical moving member 27 rises from below toward the substantially uppermost position. Occasionally, the up-and-down moving member 27 is connected to the connecting pin 3.
4 is contacted from below and is temporarily rotated to the jump position, but is immediately rotated back to the connecting position by the winding spring 44, and the connecting pin 34 is automatically connected to the engaging groove 27a. ing. Next, a presser foot device 50 that switches and drives the presser foot 52 that presses the work cloth near the sewing needle 22 between the raised position and the lowered position will be described with reference to FIG.

On the rear side of the base needle bar 26, a pressing bar 51 is arranged in the vertical direction, and the upper end and the lower end of the pressing bar 51 are supported by the main body frame 7 so as to be vertically movable, respectively.
The rear end of the presser foot 52, which is bent in a crank shape in a side view, is fixed to the lower end of the presser bar 51, and the sewing needle 22 can be inserted into a circular insertion hole 52a formed in the front end of the presser foot 52. It has become. By the way, the main body frame 7
Further, a plate-shaped support plate 53 is fixed so as to project rightward, and a presser foot motor 54 composed of a two-phase stepping motor is attached to the support plate 53.

The presser foot motor 54 is energized by a 1-2 phase excitation system by a control device 70 described later, and is rotated once in about 400 pulses. That is, the excitation sequence is (A), (A, B), (B), (B, A-),
... One-phase excitation and two-phase excitation are alternately repeated and excited as in (B-) and (B-, A). Presser foot motor 5
The base end of the drive arm 55 is fixed to the drive shaft 54a of No. 4 and the small bearing 5 is attached to the end of the drive arm 55.
6 is provided. An operating lever 57 having a substantially inverted L-shape when viewed from the front is disposed between the presser foot motor 54 and the pressing rod 51, and the operating lever 57 is pivotally fixed to the support plate 53 at a substantially central position thereof. It is rotatably supported by a pin 65. That is, the presser foot 52 is the presser foot motor 5
4 is operably connected.

A first arm portion 57a extending below the operation lever 57 is formed with an operation portion 57b bent rearward, and a second arm portion 57 of the operation lever 57 is formed.
c is a locking member 5 that extends to the left and is attached to the presser bar 51.
8 is abutted from below. In addition, a bifurcated first protrusion 57d formed on the operation lever 57 and a second protrusion
Between the protrusion 57e and the bearing 5 of the drive arm 55,
6 is slidably fitted. That is, the drive arm 55
When the presser foot motor 54 is driven to rotate normally to the first rotation position shown by the solid line, the operation lever 57 is moved to the operation position shown by the solid line through the engagement between the bearing 56 and the first protrusion 57d. Since it rotates, the presser bar 51 is raised to the raised position shown by the solid line via the locking member 58.

On the other hand, when the drive arm 55 is rotated to the second rotation position shown by the chain double-dashed line, the operating lever 57 is rotated to the retracted position shown by the chain double-dashed line, so that it is pressed through the locking member 58. The bar 51 descends to the descending position indicated by the chain double-dashed line.
At this time, since the compression coil spring 59 is interposed between the locking member 58 and the main body frame 7, the presser bar 51 is urged downward by the spring force of the compression coil spring 59, so that the presser foot 52 can be securely held. Move down to the lowered position. Furthermore, presser bar 5
An actuating lever 60 having a substantially crank shape in a side view is rotatably supported by a screw 61 on the main body frame 7 on the right side of 1, and a driving portion 60a of the operating lever 60 extends to the left,
The engaging member 62 fixed to the lower end of the presser bar 51 can come into contact with the engaging member 62 from above.

The actuating portion 60b of the actuating lever 60 extends to the right, and the tip of the actuating portion 60b shuts off the presser foot sensor 63 of the optical system, which is attached to the lower end of the support plate 53 and includes a photo interrupter. It is supposed to do. That is, as shown in FIGS. 3 and 4, when the presser foot 52 is in the lowered position, the presser foot sensor 63 outputs the presser foot signal PS (corresponding to a detection signal) at the “L” level. The forward rotation of the motor 54 drives the presser bar 51 to rise through the operating lever 57 and the locking member 58, and when the presser foot 52 rises from the lowered position to the raised position, the operating lever 60 engages the engaging member. Since the light emitted from the light emitting element of the presser foot sensor 63 is turned off by the operating portion 60b by the switch 62, the presser foot sensor 63 outputs the “H” level presser foot signal PS. Become. here,
The actuating lever 60, the presser foot sensor 63, and the like constitute detection means.

By the way, a winding spring 64 is stretched around the tip of the drive arm 55 and the operating lever 57, and the spring force of the winding spring 64 causes the first protruding portion 57d to move when the operating lever 57 is in the operating position. When the operating lever 57 is in the retracted position while being pressed and urged by the bearing 56, the second protrusion 57e is pressed and urged by the bearing 56, and the operating lever is pressed during sewing with each of the embroidery sewing machines M1 to M3. Even when the vibration of 57 occurs, it is possible to suppress the generation of the collision noise that the first and second projecting portions 57d and 57e collide with the bearing 56. Here, the presser foot 52 is vertically driven by a presser foot up-and-down drive mechanism (not shown) at a predetermined timing in synchronization with the rotation of the main shaft 17 during sewing.

Next, the outline of the control system of the multi-head embroidery sewing machine M will be described with reference to the block diagram of FIG. A control device 70 (corresponding to control means) that controls the entire embroidery sewing machine M includes a microcomputer including a CPU 71, a ROM 72, and a RAM 73, and an input interface connected to the microcomputer via a bus such as a data bus ( (Not shown) and an output interface (not shown).

With respect to the embroidery sewing machine M1, a drive circuit 75 for the needle bar jump solenoid 41, a drive circuit 76 for the presser foot motor 54, and a presser foot sensor 63 are connected to the control device 70, respectively. , Other embroidery sewing machines M2
The same is true for M3. Further, the control device 70 includes a drive circuit 78 for driving the sewing machine motor 77.
And a needle bar changing motor 79 for moving and driving the needle bar case 20.
Drive circuit 80, an X-axis drive motor 81, a drive circuit 82, and a Y-axis drive motor 83, a drive circuit 84.
And the operation panel 18 are connected to each other.

Next, the routine of the presser foot lifting control executed by the control device 70 will be described with reference to the flowcharts of FIGS. However, the control program for the presser foot lifting control is stored in advance in the ROM 72. Reference numeral Si (i = 10, 11, 12, ...) In the drawing represents each step. This control is started when the power of the multi-head embroidery sewing machine M is turned on. By the way, when the power is turned on, or when an ascending command for ascending the presser foot 52 is output (S10, S11: Yes),
Presser foot lifting processing control (see FIG. 7) is executed (S1).
2).

When this control is started, first, the count value I of the pulse number counter is cleared (S20), and the excitation of the presser foot motor 54 is started (S21). At this time, the presser foot signal PS from the presser foot sensor 63 is read, the presser foot signal PS is at the “L” level, and when the presser foot 52 is in the lowered position (S22: No), the presser foot motor 54 makes one pulse. When the count value I is smaller than the drive pulse number N corresponding to the rotation limit position of the operating lever 57 (S25: Yes) , S22 to S25 are repeatedly executed, the presser bar 51 is raised via the drive lever 55 and the operation lever 57.

When the presser foot 52 reaches its raised position and the presser foot signal PS switches to the "H" level (S22: Yes), when the presser foot signal PS switches to the "H" level. A current excitation phase of the presser foot motor 54, for example, an (A, B) excitation phase is detected, and the excitation phase is stored in the work memory of the RAM 73 as a detection excitation phase (S
27). That is, each time the presser foot 52 is lifted by the presser foot motor 54 in response to a lift command, the detected excitation phase of the presser foot motor 54 is updated and stored each time, so that the presser foot device 50 is mechanically worn. Even if the detection excitation phase deviates, the optimum detection excitation phase can be stored in the raised position of the presser foot 52.

Next, the presser foot motor 54 is further driven in the normal direction by 2 pulses, and is held in the excited state of the excitation phase driven by 2 additional pulses (S28), and the count value I is incremented by 2 ( In step S29, "1" indicating the raised position is set as the flag data of the presser foot flag PF (S30), the control is terminated, and the process returns to step S10 of the presser foot lifting control. Here, the presser foot motor 54 is set to 2
By additionally driving only the pulse, the presser foot signal PS is prevented from being inadvertently switched to the “L” level due to the vibration of the operating lever 60 during sewing.

By the way, when a lowering command for lowering the presser foot 52 is output at the time of starting sewing (S10: Yes, S11: No), the presser foot lowering process control (FIG. 8) is performed.
(See) is executed (S13). When this control is started, the excitation of the presser foot motor 54 is released (S35), "0" indicating the lowered position is set as the flag data of the presser foot flag PF (S36), and this control is ended. hand,
The process returns to S10.

That is, when the presser foot 52 in the raised position is lowered in response to the lowering command, the excitation of the presser foot motor 54 is released, and the release is held while the presser foot 52 is in the lowered position. , The presser foot motor 54 is de-excited, and the presser foot 52 can be lowered to the lowered position by the urging force of the compression coil spring 59. When the presser foot motor 54 is held in the lowered position, the presser foot motor 54 is kept de-energized. The presser foot up-and-down drive mechanism can drive the presser foot up and down in synchronization with the sewing machine motor 77 to perform sewing.

On the other hand, in the presser foot lifting control, when no lifting command is output (S10: No), the standby processing control (see FIG. 9) is executed (S14). When this control is started, the presser foot flag PF is not set, that is, when the presser foot flag PF is reset and the lowering position of the presser foot 52 is instructed (S40: No), the presser foot signal PS is output.
Is at the "L" level and the presser foot 52 is in the lowered position (S41: No), the control is terminated and the process returns to S10. That is, while the presser foot 52 is in the lowered position, the release is controlled to be maintained.

Further, when the presser foot flag PF is set and the rising position of the presser foot 52 is instructed (S
40: Yes), when the presser foot signal PS is at the “H” level, presser foot 5
When 2 is in the raised position (S45: No), this control is terminated and the process returns to S10. That is, the presser foot 52
When is in the raised position, the current excitation state of the excitation phase is maintained. By the way, when the presser foot flag PF is set and the presser foot 52 is in the raised position (S40: Yes
), At the start of sewing, when the presser foot 52 is lowered to trace the area in which the movable frame 16 is moved along the embroidery area to confirm the sewing area, the operation portion 57b of the operation lever 57 is moved upward. When the pressing operation is performed, the presser foot motor 54 can be rotated to such an extent that it does not step out.

That is, since the holding bar 51 is lowered to some extent by slightly rotating the operating lever 57, the operating lever 60
When the presser foot sensor 63 outputs the presser foot signal PS at the “L” level by the rotation of (S45: Yes), the presser foot lowering processing control shown in FIG. 8 is executed (S46), and this control is ended. Then, the process returns to S10. That is, the operating lever 5
When the foot 7 is manually operated to lower the presser foot 52 from the raised position, the excitation of the presser foot motor 54 is released, and the release is held while the presser foot 52 is in the lowered position. The presser foot 52 can be lowered to the lowered position by the urging force.

On the other hand, when the presser foot flag PF is reset and the presser foot 52 is in the lowered position (S4
0: No), when the operating portion 57b of the operating lever 57 is pressed downward to raise the presser foot 52, the excitation of the presser foot motor 54 is released, so that the operating lever 57 can be easily pressed. At the same time, the presser foot 52 can be raised to its raised position via the presser bar 51. At this time, the presser foot sensor 63 switches to the presser foot signal PS of "H" level and is output (S41: Yes). As a result, the presser foot motor 54 is excited to the detection excitation phase stored in S27 (S42), and the presser foot motor 54 is further driven by two pulses in the forward direction and the excitation phase of the extra drive pulse of two pulses is excited. The state is maintained (S43), the presser foot flag PF is set (S44), the control is terminated, and the process returns to S10.

That is, when the operating lever 57 is manually operated to raise the presser foot 52 from the lowered position, the presser foot motor 5
In addition, 4 is additionally driven by two pulses in addition to the first predetermined excitation phase after detection of the presser foot signal PS switched from the presser foot sensor 63 to the “H” level, and is excited and held in the predetermined excitation phase. Therefore, when the presser foot 52 stops at the ascending position, the excitation phase of the presser foot motor 54 is determined as in the case where the presser foot 52 is automatically raised by the ascending command. The forward rotation and the reverse rotation do not occur as much as 1/2 step, and the operator's hand does not feel uncomfortable, so the operation feel is improved. Here, the final excitation phase obtained by advancing the excitation phase corresponding to two pulses from the stored excitation phase corresponds to the predetermined excitation phase.

Here, as a modification of the above embodiment,
As shown in FIG. 10, the presser foot lowering process control of FIG. 8 is partially changed, and when lowering the presser foot 52, the presser foot motor 54 is reversely rotated by the drive pulse number I when the presser foot 52 is raised. It is driven (S50), and thereafter, similarly to S35 to S36, the excitation of the presser foot motor 54 is released (S51), and the presser foot flag PF is reset (S52). In this case, the presser foot 52 can be smoothly and quietly lowered to the lowered position. Further, it is not always necessary to provide the 2-pulse forward rotation drive in S28 of the presser foot lifting process control of FIG. 7 and S43 of the standby process control of FIG.

Further, the operating lever 60 may not be provided, and the pressing foot sensor 63 may output the pressing foot signal PS of "H" level when the operating lever 57 is rotated to the operating position. . Further, various modifications may be made to the above-described embodiment based on existing technology or technology obvious to those skilled in the art. Further, it is needless to say that the present invention can be applied to various pattern sewing machines that sew various pattern patterns.

[0048]

According to the invention of claim 1, the detecting means for detecting the rising position of the presser foot, the stepping motor capable of driving the presser foot to move up, and the detection signal of the detecting means are used to lift or lower from outside. The stepping motor is controlled according to the command, and the stepping motor is controlled so as to allow the work clamp to move up and down by the manual operation of the operating lever. It is possible to raise and lower the foot, and there is no interference between the operating lever and the stepping motor when the operating lever is manually operated to raise and lower the presser foot. Since it is not necessary to set a mode for manual operation, the operation system does not become complicated and the switch operation does not become complicated. Further, since the presser foot can be driven by the stepping motor instead of the solenoid actuator, the manufacturing cost can be reduced, and no collision noise is generated when the stepping motor is operated. Then, operate the operating lever manually to lift the work clamp.
When lowering from the raised position, the control means step
Release the motor excitation and move the work clamp to the down position.
Since the release is maintained during the operation, the biasing force of the spring member
The lifter foot can be lowered to the lowered position and
Holds the stepping motor de-energized in the down position
Therefore, during sewing, it is pressed by another drive system in synchronization with the sewing machine motor.
Sewing can be performed by vertically moving the foot.

According to the second aspect of the present invention, since the stepping motor is operatively connected to the presser foot via the operation lever, the stepping motor is driven to move the presser foot to the raised position via the operation lever. And can be raised and lowered to the lowered position. In addition, the same effect as that of the first aspect is obtained.

According to the third aspect of the invention, the control means performs stepping when the lifting position of the presser foot is detected by the detecting means when the presser foot is lifted from the lowered position by the stepping motor in response to the lift command. Since the motor excitation phase is detected and the excitation phase is stored in the memory as the detection excitation phase, the stored detection excitation phase is used when the presser foot is raised manually and when it is automatically raised by a rise command. Can be used to smoothly stop at the same elevated position, and each time the presser foot is raised by the stepping motor, the detected excitation phase of the stepping motor is updated and stored each time. Even if the detection excitation phase deviates due to excessive wear, the optimum detection excitation phase can be stored at the elevated position of the presser foot. In addition, the same effect as that of claim 1 or 2 is achieved.

According to the fourth aspect of the present invention, when the presser foot is in the raised position, the control means holds the stepping motor in the excited state of the predetermined excitation phase which is advanced from the detection excitation phase by the predetermined step, so that the vibration due to sewing is prevented. Even if it occurs, the rising position of the presser foot can be reliably detected by the detection means, and the presser foot can be held at the raised position even if the presser foot is urged downward by the spring member. Other,
The same effect as that of claim 3 is achieved.

[0052]

According to the fifth aspect of the invention, when the operating lever is manually operated to raise the presser foot from the lowered position, the control means causes the detection means to detect the raised position of the presser foot first, and then the first predetermined value. Since the stepping motor is excited and held in the excitation phase, when the presser foot stops at the raised position, the stepping motor does not rotate about 1/2 step forward or reverse, and the operator's hand feels uncomfortable. Since it does not occur, the operation feel is improved. Other,
The same effect as in claim 4 is achieved.

According to the sixth aspect of the present invention, the control means releases the excitation of the stepping motor while lowering the presser foot in the ascending position in response to the descending command and while the presser foot is in the descending position. Holds its release, the excitation of the stepping motor can be released, and the presser foot can be lowered to the lowered position by the biasing force of the spring member.
During sewing, the presser foot can be vertically moved by another drive system in synchronization with the sewing machine motor to perform sewing. In addition, the same effect as that of claim 1 or 2 is achieved.

According to the invention of claim 7 , when the control means raises the presser foot in the lowered position in response to the ascending command, the predetermined first time after the detection means detects the raised position of the presser foot. Since the stepping motor is excited and held in the excitation phase, the presser foot is stopped and held at the same lifted position when the presser foot is manually lifted and automatically lifted by a lift command. be able to. Other,
The same effect as in claim 4 or 5 is achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-head embroidery sewing machine.

FIG. 2 is a schematic perspective view of a needle bar jump mechanism and a needle bar drive mechanism.

FIG. 3 is a front view of a presser foot device.

FIG. 4 is a diagram illustrating a presser foot signal with respect to a lifting position of a presser foot.

FIG. 5 is a block diagram of a control system of the multi-head embroidery sewing machine.

FIG. 6 is a schematic flowchart of a presser foot lifting control routine.

FIG. 7 is a schematic flowchart of a routine of presser foot lifting processing control.

FIG. 8 is a schematic flowchart of a routine of presser foot lowering processing control.

FIG. 9 is a schematic flowchart of a standby processing control routine.

FIG. 10 is a schematic flowchart of a presser foot lowering processing control routine according to a modification.

[Explanation of symbols]

M Multi-head embroidery sewing machine 50 Presser foot device 51 Presser bar 52 Presser foot 54 Presser foot motor 57 Operation lever 59 Compression coil spring 60 operating lever 63 Presser foot sensor 70 Control device 71 CPU 72 ROM 73 RAM

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-7-116372 (JP, A) JP-A-6-304362 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (7)

(57) [Claims] 1. A presser foot which is supported by a sewing machine body frame so as to be able to move up and down via a presser bar, and an operating lever for switching the presser foot between an ascending position and a descending position.
In a presser foot device of a pattern sewing machine including a presser foot and a spring member for urging the presser foot to a descending side, a detection unit that detects that the presser foot is in an elevated position via the presser foot or an operation lever, and the presser foot. A stepping motor which is operatively connected to the foot and can drive the presser foot at least upwardly, and a stepping motor which receives a detection signal from the detection means and controls the stepping motor according to a command to move up and down from the outside and a presser foot manually operated A stepping motor is controlled so as to allow the foot to move up and down , and the operating lever is manually operated to move the presser foot downward from the raised position.
When lowering the stepping motor, the control means
While the magnet is released and the presser foot is in the lowered position,
A presser foot device for a pattern sewing machine, which is characterized by holding the release . 2. The presser foot device for a pattern sewing machine according to claim 1, wherein the stepping motor is operatively connected to the presser foot via an operation lever. 3. The control means detects the excitation phase of the stepping motor when the presser foot is raised by the detection means when the presser foot is raised from the lowered position by the stepping motor in response to the raising command. The presser foot device for a pattern sewing machine according to claim 1 or 2, wherein the excitation phase is stored in a memory as a detection excitation phase. 4. The control means holds the stepping motor in an excited state of a predetermined excitation phase obtained by advancing a predetermined step from the detection excitation phase when the presser foot is in a raised position. Presser foot device for pattern sewing machines. 5. When the operating lever is manually operated to elevate the presser foot from the lowered position, the control means applies the stepping motor to the first predetermined excitation phase after the detection position of the presser foot is detected by the detecting means. The presser foot device for a pattern sewing machine according to claim 4, which is excited and held. 6. The control means releases the excitation of the stepping motor when lowering the presser foot in the ascending position in response to the descending command, and holds the release while the presser foot is in the descending position. Claim 1 or 2 characterized by the above-mentioned.
Presser foot device of the pattern sewing machine described in. 7. The control means excites the stepping motor in the first predetermined excitation phase after the detecting means detects the raised position of the presser foot when raising the presser foot in the lowered position in response to the ascending command. The presser foot device for a pattern sewing machine according to claim 4 or 5 , wherein the presser foot device is held.