JP2017029226A - Holing sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable multiple revolutions of a needle bar and a looper base.SOLUTION: A holing sewing machine includes: a needle vertical movement mechanism which swings a needle of a needle bar 12 and vertically moves the needle bar 12; a looper mechanism 60 which includes loopers, spreaders, and a looper base 61; a revolution mechanism 20 which revolves the needle bar and the looper base; and a control device 70 which performs holing sewing control for forming holing stitches. The revolution mechanism includes: a revolution motor 24 which serves as a driving source; and a transmission shaft 25 which performs rotational driving by the revolution motor. An amount A of shaft angle change of an output shaft of the revolution motor and an amount B of shaft angle change which, following this, occurs in the transmission shaft are set at values different from each other. An origin sensor 29 for detecting the origin position of the transmission shaft is provided, and an encoder 241 is provided in the revolution motor. The control device stores table data showing the correspondence relationship of the rotational frequency and the rotational direction of the transmission shaft with a shaft angle detected by the encoder upon the detection of the origin, and determines the rotational frequency and the rotational direction of the transmission shaft.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a hole sewing machine.

  A hole sewing machine forms a hole seam around the hole on the workpiece set on the feed base, and includes a needle bar with a needle and a looper spreader provided below the needle bar. Sewing motor drive mechanism for driving, turning mechanism for turning the needle bar and looper / spreader to form a seam radially, XY drive mechanism for driving the feed table in the front-rear and left-right directions, and feed table The hole sewing is performed by cooperating with a pressing mechanism for pressing the workpiece to be sewn on the left and right (see, for example, Patent Document 1).

JP2013-141482A

Normally, over-the-hole sewing performs over-the-hole sewing around the hole, so the conventional over-hole sewing machine is only supposed to turn for one revolution at most. The detection means for detecting the angle can only detect which shaft angle is within one rotation range.
In order to prevent the core thread from getting entangled with the looper bracket when the core thread is inserted and the hole is sewn, a stopper member is provided to physically limit the turning mechanism so that it does not rotate more than once. Was.
However, in recent years, there has been a demand for double over stitching around the hole for reasons such as increasing the thickness of the seam or improving the strength. On the side, there was a problem that it was not possible to recognize whether it was the first or second rotation.
In addition, after performing over-turn sewing for more than one revolution, if the product does not turn back in the opposite direction and returns to the origin position, it may cause twisting or entanglement of the thread. Since the sewing machine can only detect the shaft angle within one rotation range, there has also been a problem that it cannot be accurately returned to the origin position.

  An object of the present invention is to provide a sewing machine that can perform over-the-hole sewing that exceeds one rotation.

The invention according to claim 1 is a boring machine,
A needle up-and-down movement mechanism that moves the needle bar up and down while performing needle swinging,
A looper mechanism comprising a looper, a spreader, and a looper base that supports them;
A turning mechanism for turning the needle bar for swinging the needle and the looper base;
In a boring sewing machine comprising a control device that performs boring sewing control that forms boring seams,
The swivel mechanism includes a swivel motor that serves as a drive source, and a transmission shaft that is rotated by the swivel motor.
When the amount of change in the shaft angle of the output shaft of the swing motor is A and the amount of change in the angle of the shaft generated along the transmission shaft is B, A / B ≠ 1
The transmission shaft is provided with an origin sensor for detecting a state at the origin position,
An encoder for detecting the shaft angle is provided on the output shaft of the swing motor,
The control device includes:
Stores table data indicating a correspondence relationship between the rotation speed and rotation direction of the transmission shaft and the shaft angle of the output shaft of the swing motor detected by the encoder when an origin sensor signal is detected from the origin sensor;
The rotation speed and the rotation direction of the transmission shaft are specified by the table data and the shaft angle of the output shaft of the swing motor detected by the encoder when an origin sensor signal is detected from the origin sensor. To do.

The invention according to claim 2 is the boring machine according to claim 1,
When the state where the output shaft of the swing motor is at the origin position of the output shaft and the transmission shaft is at the origin position of the transmission shaft is the initial position of the swing mechanism,
Axis angle detection for obtaining an axial angle change amount of the transmission shaft from the initial position from the rotation speed and rotation direction of the transmission shaft that has been identified most recently and the axial angle of the output shaft of the swing motor detected by the encoder A processing unit is provided.

The invention according to claim 3 is a boring machine,
A needle up-and-down movement mechanism that moves the needle bar up and down while performing needle swinging,
A looper mechanism comprising a looper, a spreader, and a looper base that supports them;
A turning mechanism for turning the needle bar for swinging the needle and the looper base;
In a boring sewing machine comprising a control device that performs boring sewing control that forms boring seams,
The swivel mechanism includes a swivel motor that serves as a drive source, and a transmission shaft that is rotated by the swivel motor.
When the amount of change in the shaft angle of the output shaft of the swing motor is A and the amount of change in the angle of the shaft generated along the transmission shaft is B, A / B ≠ 1
An origin sensor for detecting a state at the origin position is provided on the output shaft of the swing motor,
The transmission shaft is provided with an encoder for detecting a shaft angle,
The control device includes:
Stores table data indicating the correspondence between the rotation speed and rotation direction of the output shaft of the swing motor and the shaft angle of the transmission shaft detected by the encoder when an origin sensor signal is detected from the origin sensor;
The rotational speed and direction of the output shaft of the swing motor are specified by the table data and the shaft angle of the transmission shaft detected by the encoder when an origin sensor signal is detected from the origin sensor. To do.

According to a fourth aspect of the present invention, there is provided the boring machine according to the third aspect,
When the state where the output shaft of the swing motor is at the origin position of the output shaft and the transmission shaft is at the origin position of the transmission shaft is the initial position of the swing mechanism,
The shaft angle for obtaining the amount of change in the shaft angle of the transmission shaft from the initial position from the rotation speed and rotation direction of the output shaft of the turning motor most recently identified and the shaft angle of the transmission shaft detected by the encoder A detection processing unit is provided.

According to a fifth aspect of the present invention, in the drilling machine according to any one of the first to fourth aspects,
The encoder is of an absolute type.

According to a sixth aspect of the present invention, there is provided the boring machine according to any one of the first to fifth aspects,
A: B = 1: n or A: B = n: 1
However, n is a natural number.

According to a seventh aspect of the present invention, there is provided the hole sewing machine according to any one of the first to sixth aspects,
A: B = n1: n2
However, n1 and n2 are both natural numbers.

In the present invention, an origin sensor is provided on one of the output shaft and the transmission shaft of the swing motor, and an encoder is provided on the other. The amount of change in the shaft angle of the output shaft of the swing motor is A. When the quantity is B, A / B ≠ 1.
For this reason, when the transmission shaft provided with the origin sensor or the output shaft of the swing motor makes one rotation, the output shaft or transmission shaft of the swing motor provided with the encoder rotates with a certain angle deviation. Since this deviation changes according to the number of rotations, this relationship is stored in the table data and referenced so that the transmission shaft provided with the origin sensor or the output shaft of the swing motor can be determined from the detected angle of the encoder when the origin sensor is detected. Can be obtained.
As a result, the present invention can determine the number of rotations of the shaft even when one of the transmission shaft provided with the origin sensor or the output shaft of the turning motor makes one or more turns, and makes multiple turns. It is possible to return to the initial position later, and it is possible to form a double hole seam.
In addition, it is possible to effectively suppress the occurrence of twisting and tangling of the yarn.

It is a side view of the buttonhole sewing machine concerning this embodiment. It is a front view of the buttonhole sewing machine of FIG. It is a block diagram which shows the control system of the buttonhole sewing machine of FIG. It is a disassembled perspective view of a turning mechanism. It is a diagram showing the relationship between the origin detection signal from the origin sensor and the amount of change in the shaft angle detected by the encoder of the turning motor when the transmission shaft of the turning mechanism is rotated a plurality of times. It is a graph which shows the relationship between the origin detection signal by an origin sensor at the time of rotating the transmission shaft of a turning mechanism in multiple times, and the amount of shaft angle changes detected by the encoder of a turning motor. It is explanatory drawing which shows the sewing pattern of the chrysanthemum hole stitch which is a hole stitch. It is a flowchart which shows the whole process of the sewing control of the chrysanthemum hole sewing by a buttonhole sewing machine. It is a flowchart which shows the detection process of the transmission shaft angle at the time of turning by a turning mechanism. FIG. 10A to FIG. 10D are explanatory diagrams showing the correspondence between the turning motor output shaft angle at the time of detecting the origin of the transmission shaft and the shaft angle change due to the subsequent rotation.

[Overall Configuration of Embodiment]
A buttonhole sewing machine 1 as a hole sewing machine according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of the buttonhole sewing machine 1, FIG. 2 is a front view of the buttonhole sewing machine 1, and FIG. 3 is a block diagram showing a control system of the buttonhole sewing machine 1. The buttonhole sewing machine 1 is not limited to a buttonhole and is a sewing machine that enables various types of holehole sewing.
As shown in FIG. 1, the buttonhole sewing machine 1 includes a box-shaped bed portion 2 a located at the lower part of the entire sewing machine, a standing body portion 2 b provided at one end of the bed portion 2 a, and the standing body portion. The sewing machine frame 2 includes an arm portion 2c provided so as to extend from 2b in the same direction as the bed portion 2a.

In the following description, the vertical vertical direction in which the standing body portion 2b is erected is the Z-axis direction, the longitudinal direction of the bed portion 2a and the arm portion 2c is the Y-axis direction, and the Y-axis direction is perpendicular to the Z-axis direction. The direction orthogonal to both the direction and the Z-axis direction is taken as the X-axis direction.
Further, the direction in which the arm part 2c extends from the standing body part 2b in the Y-axis direction is the front, the opposite side is the rear, and the X-axis direction is viewed from a state facing the front end part of the arm part 2c. Left hand side is left and right hand side is right.

  As shown in FIGS. 1 to 3, the buttonhole sewing machine 1 includes a needle bar 12 that holds a sewing needle 11 through which an upper thread is passed, and a needle bar swivel base 13 that supports the needle bar 12 in a swingable manner. And a needle up / down moving mechanism (not shown) for moving the needle bar 12 up and down, a looper mechanism 60 for forming a hole seam, and a needle bar swivel 13 and a looper base 61 of the looper mechanism 60. Turning mechanism 20, sewing machine motor 17 as a driving source for sewing operation, balance 14 for pulling up the upper thread from the sewing needle side or feeding the upper thread from the thread supply source side, and applying tension to the upper thread A thread tension device (not shown), a cloth feed mechanism 50 as a feed mechanism that moves and positions a cloth as a sewing object along an XY plane by an arbitrary amount of movement, and an upper thread and a lower thread Thread trimming device (not shown) for thread trimming and button hole A knife mechanism 30 for, and a pressing mechanism 40 for pressing the fabric on the upper surface of the feed base 51 of the cloth feed mechanism 50, and a control unit 70 as a control unit for controlling the respective units.

[Needle bar]
As shown in FIGS. 1 and 2, the needle bar 12 is formed in an inner hollow tubular shape, and its upper end protrudes outward from the upper surface of the arm portion 2c of the sewing machine frame 2 and is located above the upper end opening. A thread is inserted, and the upper thread is guided from the feed hole provided in the outer peripheral surface of the lower end portion through the hollow interior to the sewing needle 11.

As shown in FIGS. 1 and 2, the needle up-and-down movement mechanism includes a needle bar 12 that holds the sewing needle 11, an upper shaft to which full-rotation torque is applied by the sewing machine motor 17, and reciprocation in the vertical direction from the upper shaft. A crank mechanism for taking out the driving force, a swinging arm whose front end connected to the needle bar 12 by the crank mechanism swings up and down, a sleeve that supports the needle bar so as to move up and down, and an X− that supports the sleeve And a thin plate-like leaf spring along the Y plane.
Such a needle up-and-down movement mechanism is capable of reciprocating up-and-down movement with a reciprocating number (the number of reciprocations per unit time, hereinafter referred to as “reciprocating number”) that is proportional to the number of revolutions of the sewing machine motor 17 on the needle bar 12 by the crank mechanism. Grant. Further, the sleeve that supports the needle bar 12 is supported by a leaf spring along the XY plane so as to be swingable, so that the sewing needle 11 side of the lower end of the needle bar 12 can be either X or Y. The needle bar 12 is supported so that it can also be swung in the direction.

Further, the needle up-and-down movement mechanism includes a needle bar swinging base that allows the needle bar 12 to move back and forth along the X-axis direction while allowing the needle bar 12 to move up and down, and a sewing machine motor 17 to swing the needle bar. A transmission mechanism is provided for reciprocating up and down movement with respect to the moving table. Such a needle bar swing base is formed with a cam groove that is inclined in the combined direction of the X-axis direction and the Z-axis direction, and the needle bar swivel base 13 can move along the cam groove. I support it.
When the lowering motion is applied to the needle bar swinging table by the transmission mechanism, the needle bar swinging table moves in a diagonally downward left direction along the cam groove, and the needle bar 12 swings to the left. Motion is granted. Further, when the needle mechanism swinging table is lifted by the transmission mechanism, the needle bar swinging table moves to the upper right direction along the cam groove, and the needle bar 12 swings to the right. Motion is granted.
Such a transmission mechanism applies a vertical movement with a reciprocal number that is 1/2 of the reciprocating number of the vertical movement of the needle bar 12, so that each time the needle bar 12 swings left and right. It is possible to move down and swing the needle.

  The needle up-and-down movement mechanism supports the needle bar 12 in the Z-axis direction (vertical direction) in a state where the above-described leaf spring does not bend. Perform needle drop. In addition, when a swing motion is applied from the basic posture, the state is inclined by a predetermined angle in the combined direction of the X axis direction and the Z axis direction, and in this inclined state, the needle drop of the outer needle of the needle swing stitch is performed. Become.

The needle bar swivel 13 is rotatably supported around the Z axis on the lower side near the front end of the arm 2c of the sewing machine frame 2 and is fixedly equipped with a pulley 27 around which the timing belt 21 of the swivel mechanism 20 is stretched. doing. Thereby, when a turning motion is given from the turning mechanism 20, it is possible to give a turning motion around the Z axis to the needle bar 12 via the needle bar swinging base described above.
Further, the needle bar swivel base 13 pivots around the Z axis while supporting the needle bar swing base, so that the needle bar 12 is swung not only in the left-right direction but also in any direction centered on the Z axis. It is possible to move.

[Looper mechanism]
As shown in FIG. 1, the looper mechanism 60 is disposed above the sewing machine bed portion 2 a and below the feed base 51 of the cloth feed mechanism 50 described later. The looper mechanism 60 is mounted on the looper base 61 rotatably supported on the sewing machine bed 2a around the Z axis, and is mounted on the upper part of the looper base 61. A left looper and a left spreader; a right looper and a right spreader that perform single-thread ring stitching with an upper thread; and a drive mechanism that applies a predetermined swinging operation for sewing to each looper and each spreader. .

The looper base 61 is supported concentrically with the pivot axis of the needle bar swivel 13 described above, and is fixedly equipped with a pulley 26 around which the timing belt 23 of the swivel mechanism 20 is stretched.
The left looper and the left spreader and the right looper and the right spreader are arranged at both ends in the radial direction of the circle centering on the pivot axis, in the upper part of the looper base 61. At the time of sewing, the left looper and the left spreader perform double chain stitching on the needle drop of the inner needle of the needle bar 12, and the right looper and right spreader single yarn for the needle drop of the outer needle of the needle bar 12. The basic swivel angle of the looper base 61 is set so that the chain stitching is arranged.

The drive mechanism includes a circular looper drive shaft 62 supported so as to move up and down at the center position of the looper base 61, a spreader drive shaft 63 inserted through the looper drive shaft 62, and the reciprocation of the looper drive shaft 62. A transmission mechanism that swings the left and right loopers by the vertical movement, a transmission mechanism that swings the left and right spreaders by the reciprocating vertical movement of the spreader drive shaft 63, and each drive shaft 62 from the lower shaft that is rotationally driven by the sewing machine motor 17. , 63 to move up and down.
The drive mechanism applies up and down movement to each drive shaft 62 and 63 at half the number of reciprocations of the up and down movement of the needle bar 12 (same as the rotation speed of the sewing machine motor 17). Thus, each time the needle bar 12 is lowered, the left and right loopers and spreaders can alternately capture the upper thread from the sewing needle 11.

[Cloth feed mechanism]
As shown in FIGS. 1 to 3, the cloth feed mechanism 50 includes a feed base 51 having a fabric placement surface parallel to the XY plane, and a cloth movement motor that moves the feed base 51 along the X-axis direction. As an X-axis motor 52, a Y-axis motor 53 as a cloth movement motor for moving the feed base 51 along the Y-axis direction, and rotational driving forces of the motors 52 and 53 along the X-axis direction and the Y-axis direction. It is constituted by a known power transmission mechanism that is converted into a linear motion driving force and applied to the feed base 51.

[Female mechanism]
As shown in FIGS. 1 to 3, the knife mechanism 30 is disposed behind the needle bar 12 in order to form a button hole in the cloth.
That is, the knife mechanism 30 includes a knife receiver 32 supported so as to be movable up and down at the lower part of the arm part 2c, a cloth cutting knife 31 arranged in a fixed state facing the knife receiver 32 at the upper part of the bed part 2a, and a knife A female motor 33 serving as a raising / lowering drive source for the receiver 32 and a pinion-rack mechanism (not shown) that converts the torque of the female motor 33 into a raising / lowering operation and transmits it to the female receiver 32 are provided.

A plurality of types of female receptacles 32 are prepared corresponding to the shape of the button hole to be formed, and can be exchanged.
The cloth cutting knife 31 is arranged below an openable opening 511 formed in the center of the feed base 51 in the X-axis direction, and the knife receiver 32 descends to match the cloth cutting knife 31 and against the cloth. The button hole formation is not hindered.

[Pressing mechanism]
The holding mechanism 40 is a pair of cloth receiving plates 41 supported so as to be movable in the left-right direction around the cutting position S by the knife mechanism 30 located in the center in the X-axis direction with respect to the opening on the upper surface of the feed base 51. 41, a pair of cloth presser lifting / lowering mechanisms 42, 42 provided on the upper surface of the rear end of each cloth receiving plate 41, 41, and a pair of opening / closing airs for imparting a lateral movement to each cloth receiving plate 41, 41 Cylinders 438, 438.
The cloth receiving plates 41, 41 are flat plates arranged above the cloth cutting knife 31, and cloth presser raising / lowering mechanisms 42, 42 are arranged on the upper surfaces thereof.
Each cloth presser elevating mechanism 42 includes a cloth presser 421, a support arm 422 that supports the cloth presser 421 at the front end, and a cloth presser air cylinder 425 that lifts and lowers the cloth presser 421 via the support arm 422.
Then, on the upper surface of each cloth receiving plate 41, 41, each cloth holding air cylinder 425, 425 applies holding pressure by the cloth holding 421, 421, and each opening / closing air cylinder 438, 438 holds each cloth receiving plate 41, 41. By pressurizing in directions away from each other, the fabric can be held while applying tension in a direction away from the cloth cutting knife 31.

[Thread trimming device]
The thread trimming device that cuts the upper thread includes a moving knife provided on the looper base 61 and an upper thread trimming air cylinder 15 that causes the moving knife to perform a cutting operation, thereby cutting the upper thread.
The thread trimming device that cuts the lower thread includes a moving knife and a fixed knife inside the feed base 51, and causes the moving knife to perform a cutting operation using the lower thread trimming air cylinder 16 (see FIG. 3) as a drive source. . As a result, the lower thread is captured by the moving knife and cut by cooperation with the fixed knife.

[Swivel mechanism]
As shown in FIG. 4, the turning mechanism 20 is provided above and below a turning motor 24 disposed in the sewing machine bed 2a and a transmission shaft 25 for transmitting the torque of the turning motor 24 to the needle bar turning base 13 side. The transmission pulleys 22 and 22, the main driving pulley 28 provided on the output shaft of the turning motor 24, the pulley 26 provided on the looper base 61 described above, the lower transmission pulley 22 and the main driving pulley 28 described above, A timing belt 23 spanned between the pulley 26 and a timing belt 21 spanned between the upper transmission pulley 22 and the pulley 27 provided on the needle bar swivel 13 described above are provided. .
Also, reference numeral 251 in FIG. 4 is a bearing that rotatably supports the transmission shaft 25 in a state along the Z-axis direction, reference numeral 211 is a tension pulley that presses from the outside of the timing belt 21 to prevent loosening, and reference numeral 231 is a timing. The tension pulley is pressed from the outside of the belt 23 to prevent looseness.

In the turning mechanism 20, the transmission ratio of each pulley is set so that the looper base 61 and the needle bar turning base 13 rotate at the same phase and constant speed by the rotational drive of the turning motor 24. That is, the turning mechanism 20 imparts a turning action so that the needle swinging direction of the needle bar and the direction in which the left and right loopers and spreaders are aligned always turn.
For this reason, the upper and lower transmission pulleys 22 and 22, the hook-side pulley 26, and the needle bar-side pulley 27 (hereinafter referred to as “pulley 27 and the like”) have the same outer diameter.

The main pulley 28 is larger than the outer diameter of the pulley 27 and the like. As a result, in the turning mechanism 20, the reduction ratio between the output shaft of the turning motor 24 and the transmission shaft 25 is 35:26 (26/35). It has become. That is, the following relationship is established.
[Axis angle change amount of output shaft of swing motor]: [Axis angle change amount generated in transmission shaft by swing motor] = 26: 35

The turning motor 24 is also provided with an encoder 241. The encoder 241 has a resolution capable of obtaining a shaft angle change of the output shaft of the turning motor 24 to a unit sufficiently smaller than 1 °. Furthermore, the encoder 241 is a so-called absolute encoder, and does not require an origin sensor, and can obtain a unique origin position determined for the output shaft of the swing motor 24 without performing origin search.
Since the encoder 241 is an absolute type, it is not necessary to store the current shaft angle in a memory or the like. For example, when the main power is turned off and the main power is turned on again, the output shaft of the turning motor 24 is immediately The current axis angle with respect to the origin position of can be recognized.
However, the absolute encoder 241 can determine the current shaft angle within the range of 0 to 360 °. For example, even if the output shaft of the turning motor 24 performs a plurality of rotations of one rotation or more, no matter what Information about whether the rotation has been performed cannot be detected.

The transmission shaft 25 is also provided with an origin sensor 29 for detecting a unique origin position determined for the transmission shaft 25.
A detection plate 291 that extends outward in the radial direction around the transmission shaft 25 is provided at the lower end of the transmission shaft 25. The origin sensor 29 is an optical sensor that includes a light emitting unit and a light receiving unit that detects reflected light by irradiation of the light emitting unit.
The detected plate 291 is arranged so as to enter the detection range of the origin sensor 29 by the rotation of the transmission shaft 25, and the edge of the detected plate 291 is detected by the change in the amount of light received by the origin sensor 29. The angle is the origin of the transmission shaft 25.

[Sewing machine control system]
A control system of the buttonhole sewing machine 1 will be described with reference to FIG. The control device 70 of the buttonhole sewing machine 1 includes a sewing machine motor drive circuit 17a for driving the sewing machine motor 17, an I / F 17b for connecting the drive circuit 17a to the CPU 71 of the control device 70, and a cloth feed mechanism 50. An X-axis motor drive circuit 52a for driving the X-axis motor 52 provided in the apparatus, an I / F 52b for connecting the drive circuit 52a to the CPU 71, and a Y-axis motor 53 provided in the cloth feed mechanism 50. A Y-axis motor drive circuit 53a for driving, an I / F 53b for connecting the drive circuit 53a to the CPU 71, a swing motor drive circuit 24a for driving the swing motor 24, and the drive circuit 24a to the CPU 71. The I / F 24b for connection and the female motor drive circuit for driving the female motor 33 And 33a, and an I / F33b for connecting the drive circuit 33a to the CPU 71.

  Further, the control device 70 of the buttonhole sewing machine 1 connects an encoder circuit 18 a that counts an output pulse of the encoder 18 that detects the amount of change in the shaft angle of the output shaft of the sewing machine motor 17 and the encoder circuit 18 a to the CPU 71. I / F 18b, an encoder circuit 241a that performs signal processing of an encoder 241 that detects the amount of change in the shaft angle of the output shaft of the turning motor 24, an I / F 241b that connects the encoder circuit 241a to the CPU 71, and a transmission shaft A sensor circuit 29 a that performs signal processing of the 25 origin sensors 29, and an I / F 29 b for connecting the sensor circuit 29 a to the CPU 71.

Further, the control device 70 of the buttonhole sewing machine 1 connects an electromagnetic valve drive circuit 425a for driving an electromagnetic valve 425c for supplying air pressure to the cloth presser air cylinder 425 and the drive circuit 425a to the CPU 71. An I / F 425b for driving, an electromagnetic valve driving circuit 438a for driving an electromagnetic valve 438c for supplying air pressure to the open / close air cylinder 438, and an I / F 438b for connecting the driving circuit 438a to the CPU 71 A solenoid valve drive circuit 15a for driving the solenoid valve 15c for supplying air pressure to the upper thread trimming air cylinder 15, an I / F 15b for connecting the drive circuit 15a to the CPU 71, and a lower thread trimming An electromagnetic valve drive circuit 16a for driving an electromagnetic valve 16c for supplying air pressure to the air cylinder 16, and the drive circuit 16a; And an I / F16b for connecting to PU71.
The buttonhole sewing machine 1 is actually provided with a cloth presser air cylinder 425 and an open / close air cylinder 438 one on each side, but only one is shown in FIG.

Furthermore, the control device 70 of the buttonhole sewing machine 1 lowers the operation panel 75 for inputting various settings, the I / F 75i for connecting the operation panel 75 to the CPU 71, and the cloth presser 54. Press switch 76, I / F 76 b for connecting press switch 76 to CPU 71, start switch 77 for starting sewing, and I / F 77 b for connecting start switch 77 to CPU 71. .
The X-axis motor 52, the Y-axis motor 53, and the turning motor 24 are pulse motors. Further, the X-axis motor 52 and the Y-axis motor 53 are provided with an origin sensor for performing origin search and an I / F for connecting the origin sensor to the CPU 71, but illustration thereof is omitted.

  In addition, the control device 70 includes a ROM 72 storing various control programs, data used in the program, data read from the ROM 72, data input or set from the operation panel 75, sewing stitch data as a result of calculation, program A RAM 73 serving as a work area for the CPU 71 to perform processing based on the above, an EEPROM 74 for storing sewing pattern data and the like, and a CPU 71 for performing various processing based on the program. The EEPROM 74 thereby functions as a data storage unit.

The sewing pattern data is pattern data for forming various hole stitches, and the EEPROM 74 stores a plurality of types of sewing pattern data. Each sewing pattern data has its own unique pattern number so that it can be individually identified.
The control device 70 controls the actuators of the needle up-and-down moving mechanism, the turning mechanism 20, the knife mechanism 30, the pressing mechanism 40, and the cloth feeding mechanism 50 based on the selected sewing pattern data.

[Axis angle detection processing of transmission shaft of swivel mechanism]
The shaft angle detection process of the transmission shaft of the turning mechanism 20 performed by the control device 70 will be described with reference to FIGS. FIG. 5 shows the relationship between the value of the output shaft angle detected by the encoder 241 of the turning motor 24 when the origin detection signal is output by the origin sensor 29, the rotational speed of the transmission shaft 25 of the turning mechanism 20, and the rotation direction of the turning motor 24. FIG. 6 is a chart showing the same relationship.

As described above, in the turning mechanism 20, the ratio of the outer diameter of the main pulley 28 provided on the output shaft of the turning motor 24 and the transmission pulley 22 provided on the transmission shaft 25 is set to 35:26. Therefore, the output shaft of the turning motor 24 rotates about 267.4 ° with respect to one rotation (360 °) of the transmission shaft 25.
Assuming that the origin position of the output shaft of the swing motor 24 and the origin position of the transmission shaft 25 coincide with each other as the initial position C of the swing mechanism 20, the transmission shaft 25 rotates from the initial position C in the forward direction (right side in FIG. 5). When the origin sensor signal is output, the encoder 241 of the swing motor 24 detects a shaft angle change of 267.4 °. Further, every time the transmission shaft 25 rotates in the forward direction, the encoder 241 is 174.8 °, 82.2 °. , 349.7 °,.
Further, every time the transmission shaft 25 makes one rotation in the reverse direction (left side in FIG. 5) from the initial position C, the encoder 241 detects 92.5 °, 185.1 °, 277.7 °,.
Thus, within the range of the predetermined rotational speeds of the transmission shaft 25 in the forward direction and the reverse direction, the output shaft angle detected by the encoder 241 shows different numerical values according to the respective rotational speeds.

Therefore, as shown in the chart of FIG. 6, if the correspondence relationship between the rotational speed of the transmission shaft 25 in the forward direction and the output shaft angle detected by the encoder 241 for each rotational speed in the reverse direction is known, the transmission shaft 25 By acquiring the output shaft angle detected by the encoder 241 when the origin sensor signal is output from the origin sensor 29, the rotational speed of the transmission shaft 25 can be identified.
In the turning mechanism 20, the ratio of the outer diameters of the main pulley 28 and the transmission pulley 22 is 35:26. Therefore, if the rotational speed of the transmission shaft 25 in the forward direction or the reverse direction does not reach 18 rotations, the encoder 241 is the same. The output shaft angle is not detected. That is, when the rotational speed in the forward direction and the reverse direction is within the range of 17 rotations or less, the turning mechanism 20 determines the output shaft of the turning motor 24 from the output shaft angle detected by the encoder 241 when the origin sensor signal is output. The direction of rotation can be identified.

The control device 70 stores in the EEPROM 74 each rotational speed within a range of forward and reverse rotational directions of the transmission shaft 25 and a plurality of rotational speeds in the forward and reverse directions (here, ± 15 rotations are exemplified). Table data indicating a correspondence relationship between output shaft angles detected by the encoder 241 and a shaft angle detection processing program for calculating a shaft angle change amount from the initial position C of the transmission shaft 25 from the correspondence relationship are stored.
Then, the CPU 71 of the control device 70 executes an axis angle detection processing program when controlling the operation of the turning mechanism 20, and the output shaft detected by the encoder 241 when the origin sensor signal is input by the origin sensor 29 of the transmission shaft 25. The angle is read, the rotation direction and the rotation speed of the transmission shaft 25 are specified with reference to the table data, and the amount of change in the shaft angle from the initial position C is calculated.

[Overall operation of buttonhole sewing machine controller]
FIG. 7 is an explanatory view showing a sewing pattern of chrysanthemum hole stitching which is a hole stitching. In this chrysanthemum hole sewing, the circumference of the circular hole formed in the fabric is intermittently turned at a predetermined angular pitch by the turning mechanism 20 while performing needle swinging, and the stitching along the circumference of the circular hole is performed. To form.
Here, a case where the stitches are formed by performing double chrysanthemum stitching, that is, turning for two rotations, is illustrated.

FIG. 8 is a flowchart showing the overall processing of the sewing control for chrysanthemum stitching by the buttonhole sewing machine 1, and FIG. 9 is a flowchart showing the detection processing of the transmission shaft angle during turning by the turning mechanism 20.
Based on these, the overall processing of the buttonhole sewing machine 1 will be described.

First, the CPU 71 starts the sewing operation for the chrysanthemum hole sewing, the feed base 51 (X-axis motor 52 and Y-axis motor 53), needle bar swivel base 13 and looper base 61 (swivel motor 24), female motor 33. The origin search by each origin sensor is executed (step S1).
In addition, about the turning mechanism 20, the output shaft of the motor 24 and the transmission shaft 25 are adjusted to the initial positions that are the respective origin positions. That is, the rotation speed T of the transmission shaft 25 of the turning mechanism 20 counted by the CPU 71 is reset to zero.

Thereafter, when the press switch 76 provided in the buttonhole sewing machine 1 is pressed (step S3), the CPU 71 lowers the cloth pressers 421 and 421 and presses the fabric (step S5).
Next, it waits for the start switch 77 provided in the buttonhole sewing machine 1 to be pressed (step S7), and when the start switch 77 is pressed, the CPU 71 starts operation control of chrysanthemum hole sewing.
First, the CPU 71 moves the knife receiver 32 up and down to form a circular hole in the fabric (step S9).

Further, the CPU 71 controls the X-axis and Y-axis motors 52 and 53 to move the feed base 51 at the origin position to the sewing start position (step S11).
Then, the CPU 71 drives the sewing machine motor 17 to start chrysanthemum hole sewing (step S13). The CPU 71 controls the turning motor 24 so that the change amount of the shaft angle of the transmission shaft 25 becomes a “target shaft angle” set in advance, and forms a necessary number of stitches in order.
That is, as described above, chrysanthemum stitching is performed over the circumference of the circular hole two times.

Here, based on FIG. 9, the detection process of the shaft angle at the time of sewing is demonstrated.
The CPU 71 reads the current rotational speed T of the transmission shaft 25 of the turning mechanism 20 (step S31). At the stage where the turning operation is not started, the rotational speed T of the transmission shaft 25 is zero.
Then, driving of the turning motor 24 is started (step S33).

The CPU 71 reads the signal output of the origin sensor 29 of the transmission shaft 25 and determines whether or not the origin sensor signal has been detected (step S35).
When the origin sensor signal is detected from the origin sensor 29, the detected angle of the encoder 241 of the turning motor 24 is read (step S37), and the rotational speed of the transmission shaft 25 in the EEPROM 74 in the forward direction and in the reverse direction are read. Referring to the table data (FIG. 6) showing the correspondence relationship of the output shaft angle detected by the encoder 241 for each rotation number, the rotation number and the rotation direction from the initial position in the current transmission shaft 25 are specified (step S39). ).
Then, the rotation speed T of the transmission shaft 25 is updated to the specified rotation speed (step S41), the process returns to step S35, and it is determined whether or not the origin sensor signal is detected.

  Chrysanthemum hole stitching is performed by repeatedly swinging around a circular hole at a predetermined angular pitch while performing needle swinging, but when forming double seams, sewing around the circular hole is not possible. Enter the second lap. At this time, when the origin sensor signal is detected from the origin sensor 29, it is determined that the hole stitching has made one round around the circular hole, and the rotation speed = 1 is obtained.

  If the origin sensor signal is not detected in step S35, the CPU 71 determines the axis of the transmission shaft 25 from the initial position based on the detected angle of the encoder 241 of the current turning motor 24 and the rotation speed T of the transmission shaft 25. An angle change amount d is calculated (step S43).

  For example, the rotation direction of the transmission shaft based on the latest origin sensor signal detection is “positive direction”, and the rotation speed T of the transmission shaft 25 at this time is T = a. When the encoder 241 detects the shaft angle b from the origin position of the turning motor 24, the CPU 71 rotates the transmission shaft 25 a in the forward direction. The shaft angle c of the output shaft of the turning motor 24 is obtained from the table of FIG. On the other hand, since the shaft angle of the output shaft of the current turning motor 24 is b, the amount of change in the positive direction from the shaft angle c to the shaft angle b is calculated. At this time, when the output shaft of the turning motor 24 rotates from the shaft angle c to the shaft angle b, when the origin position (0 °) of the output shaft does not pass, as shown in FIG. When it passes, and it passes, as shown in FIG. 10 (B), b <c.

[When the output shaft rotates in the positive direction and b ≧ c]
Accordingly, a comparison is made between the shaft angle b and the shaft angle c. When b ≧ c, the amount of change in the shaft angle of the output shaft of the turning motor 24 from the origin detection by the latest origin sensor 29 is positive. (Bc).
Since the transmission ratio between the output shaft of the turning motor 24 and the transmission shaft 25 is 35:26, the amount of change in the shaft angle from the origin position of the transmission shaft 25 when b ≧ c is multiplied by the transmission ratio to be 35 in the positive direction. / 26 * (bc).
Accordingly, the axial angle change amount d in the positive direction from the initial position of the transmission shaft 25 is d = 360 * a + 35/26 * (bc).

[When the output shaft rotates in the positive direction and b <c]
In the case of b <c, the change amount of the shaft angle of the output shaft of the turning motor 24 from the origin detection by the latest origin sensor 29 is (360 + b−c) in the positive direction.
When b <c, the amount of change in the shaft angle from the origin position of the transmission shaft 25 is 35/26 * (360 + b−c) in the positive direction multiplied by the transmission ratio.
Accordingly, the axial angle change amount d in the positive direction from the initial position of the transmission shaft 25 is d = 360 * a + 35/26 * (360 + bc).

  Further, for example, when the rotation direction based on the latest origin sensor signal detection is “reverse direction” and the rotation speed T of the transmission shaft 25 at this time is T = a, the swing motor 24 further turns the transmission shaft 25 after that. When the rotation to rotate in the reverse direction (reverse rotation of the output shaft) is continued and the encoder 241 detects the shaft angle b from the origin position of the turning motor 24, the CPU 71 detects that the transmission shaft 25 has rotated a in the reverse direction. Is obtained from the table of FIG. 6 described above. On the other hand, since the shaft angle of the current output shaft of the turning motor 24 is b, the angle change amount in the reverse direction from the shaft angle c to the shaft angle b is calculated. At this time, when the output shaft of the turning motor 24 rotates from the shaft angle c to the shaft angle b, if it does not pass the origin position (0 °) of the output shaft, as shown in FIG. If ≧ b, and passes, c <b as shown in FIG.

[When the output shaft rotates in the opposite direction and c ≧ b]
Therefore, the shaft angle b and the shaft angle c are compared in magnitude. When c ≧ b, the change amount of the shaft angle of the output shaft of the turning motor 24 from the origin detection by the latest origin sensor 29 is in the reverse direction. (C-b).
Since the transmission ratio between the output shaft of the swing motor 24 and the transmission shaft 25 is 35:26, the amount of change in the shaft angle from the origin position of the transmission shaft 25 when c ≧ b is multiplied by the transmission ratio to 35 in the reverse direction. / 26 * (c−b).
Accordingly, the axial angle change amount d = 360 * a + 35/26 * (c−b) in the reverse direction from the initial position of the transmission shaft 25 is obtained.

[When the output shaft rotates in the positive direction and c <b]
In the case of c <b, the amount of change in the shaft angle of the output shaft of the turning motor 24 from the origin detection by the latest origin sensor 29 is (360 + c−b) in the reverse direction.
The amount of change in the shaft angle from the origin position of the transmission shaft 25 when c <b is multiplied by the transmission ratio to be 35/26 * (360 + c−b) in the reverse direction.
Accordingly, the axial angle change amount d in the reverse direction from the initial position of the transmission shaft 25 is d = 360 * a + 35/26 * (360 + c−b).

Then, the CPU 71 determines whether or not the amount of change in the shaft angle of the transmission shaft 25 from the calculated initial position has reached the target shaft angle. If the target shaft angle has been reached, the CPU 71 drives the turning motor 24. Stop and end one operation (step S47).
If the target axis angle of the turning motor 24 has not been reached, the process returns to step S35, and the CPU 71 again determines the presence or absence of the origin sensor signal.

Thus, when the shaft angle detection process of FIG. 9 is completed for each of the intermittent turning operations by the turning motor 24 and the formation of the seams of the chrysanthemum stitches for two rounds is completed, the CPU 71 The process proceeds to step S15 in FIG. 8, the feed base 51 (X-axis motor 52 and Y-axis motor 53) is returned to the origin position, and the turning mechanism 20 is also returned to the initial position.
At that time, since the CPU 71 grasps the amount of change in the shaft angle from the initial position of the transmission shaft 25, it is converted from the transmission ratio into the amount of change in the output shaft angle of the turning motor 24, and at the time of sewing. The rotating motor 24 is rotated in the reverse direction, and the turning motor 24 is stopped when the detection angle of the encoder 241 reaches 0 °.

  Further, the CPU 71 operates the upper thread trimming air cylinder 15 and the lower thread trimming air cylinder 16 to cut the upper thread and the lower thread (step S17), and raises the cloth pressers 421 and 421 (step S19). Then, the press on the cloth is released to complete the sewing control of the chrysanthemum hole sewing.

[Technical effects of the embodiment of the invention]
In the buttonhole sewing machine 1, the encoder 241 is provided on the output shaft of the turning motor 24, and the origin sensor 29 is provided on the transmission shaft 25. Further, A / B = 26/35 (≠ 1) where A is the amount of change in the angle of the output shaft of the turning motor 24 and B is the amount of change in the angle of the shaft generated along the transmission shaft 25.
For this reason, when the state where both the output shaft of the turning motor 24 and the transmission shaft 25 are located at the origin is set as the initial position, if the transmission shaft 25 rotates more than one rotation from the initial position, the transmission shaft 25 is Even in the origin position, the output shaft of the turning motor 24 does not become the origin position, and the encoder 241 indicates a predetermined detection angle.
Further, if the total of the range of the rotational speed in the forward direction and the range of the rotational speed in the reverse direction with respect to the initial position is less than 35, the detection angle of the encoder 241 for every origin sensor signal detection shows a different value. .
Therefore, from this characteristic, table data indicating the correspondence between the rotational speed of the transmission shaft 25 and the shaft angle of the output shaft of the swing motor 24 detected by the encoder 241 when the origin sensor signal is detected from the origin sensor 29 and the rotation direction. By referring to the table data, the forward or reverse direction from the initial position of the transmission shaft 25 based on the detection angle of the encoder 241 when the origin sensor 29 of the transmission shaft 25 is detected. Can be obtained.
Further, the change amount of the shaft angle from the initial position of the transmission shaft 25 can also be obtained from the detected angle of the encoder 241.

As a result, the buttonhole sewing machine can turn the needle bar and the looper base a plurality of times, and can form a double hole seam.
Further, since the rotational speed of the transmission shaft 25 in the forward direction and the reverse direction and the amount of change in the shaft angle can be obtained, it is possible to return to the initial position, and to effectively suppress the occurrence of twisting and tangling of the yarn. Become.

  Further, the buttonhole sewing machine 1 determines the amount of change in the shaft angle of the transmission shaft 25 from the initial position from the shaft angle detected by the encoder 241 when the origin sensor 29 detects the origin position. Since the CPU 71 functions as a part (processing in step S43 in FIG. 9), the turning angle of one or more rotations of the needle bar and the looper base can be obtained more accurately from the amount of change in the shaft angle of the transmission shaft 25, and the hole is accurately obtained. Overlock seams can be formed.

  Further, in the buttonhole sewing machine 1, since the origin sensor 29 is provided on the transmission shaft 25 and the encoder 241 is provided on the output shaft of the turning motor 24, the turning of the needle bar 12 and the looper base 61 to be controlled is controlled. Each rotation can be obtained easily and directly from the detection signal of the origin sensor 29, and the processing becomes easy.

Further, since the encoder 241 provided in the turning motor 24 is an absolute type, a pulse counter and an origin sensor are not required, and the origin position of the turning motor 24 can be detected without searching for the origin.
Also, by using an absolute encoder, the shaft angle from the origin of the output shaft of the swing motor 24 can be obtained immediately without storing it in the memory, so the number of revolutions recorded from the initial position can be recorded as a power failure, etc. Even if it is lost due to an unforeseen cause, the rotational speed of the transmission shaft can be determined by referring to the table data only by searching the origin of the transmission shaft 25, and can be returned to the initial position. .

[Others]
In the buttonhole sewing machine 1, the encoder 241 is provided on the output shaft of the turning motor 24 and the origin sensor 29 is provided on the transmission shaft 25. However, the origin sensor is provided on the output shaft of the turning motor 24 and the transmission shaft 25 is provided with the origin sensor. An encoder may be provided. In this case, the rotation speed of the output shaft of the turning motor 24 can be obtained from the detected angle of the encoder when the origin sensor detects the origin, and the amount of change in the shaft angle of the transmission shaft 25 from the initial position can be calculated.
Therefore, also in this configuration, the needle bar and the looper base can be turned a plurality of times, and a plurality of overlaid seams can be formed. Further, the occurrence of twisting and tangling of the yarn can be reduced.

  Further, the encoder 241 provided on the output shaft or the transmission shaft 25 of the turning motor 24 is not limited to the absolute type, and an incremental type can also be used. However, in the case of the incremental type, an origin sensor, a pulse counter, and a memory for storing the detection axis angle are required.

Moreover, in the turning mechanism 20, although the transmission ratio of 35:26 was illustrated, the numerical value of a ratio is not limited.
For example, any of the following [1] to [3] may be used. However, n is a natural number, and n1 and n2 are natural numbers having no common divisor.
[1] [Axis angle change amount of the output shaft of the swing motor]: [Axis angle change amount generated in the transmission shaft by the swing motor] = 1: n
[2] [Axis angle change amount of output shaft of swing motor]: [Axis angle change amount generated on transmission shaft by swing motor] = n: 1
[3] [Axis angle change amount of the output shaft of the swing motor]: [Axis angle change amount generated in the transmission shaft by the swing motor] = n1: n2

  In any case of [1] to [3], it is possible to increase the number of rotations that can be detected by adopting larger numerical values for n, n1, and n2.

  Further, in the example of the buttonhole sewing machine 1 described above, the case of performing chrysanthemum hole sewing has been illustrated. However, any of the stitches that circulate around the hole, such as eyelet hole stitching or sleepy eyehole stitching, is performed. This is also effective when sewing.

1 Button hole sewing machine (Hole sewing machine)
DESCRIPTION OF SYMBOLS 11 Sewing needle 12 Needle bar 13 Needle bar turning base 20 Turning mechanism 24 Turning motor 241 Encoder 25 Transmission shaft 29 Origin sensor 60 Looper mechanism 61 Looper base 70 Controller 71 CPU (shaft angle detection processing unit)
C Initial position

Claims (7)

A needle up-and-down movement mechanism that moves the needle bar up and down while performing needle swinging,
A looper mechanism comprising a looper, a spreader, and a looper base that supports them;
A turning mechanism for turning the needle bar for swinging the needle and the looper base;
In a boring sewing machine comprising a control device that performs boring sewing control that forms boring seams,
The swivel mechanism includes a swivel motor that serves as a drive source, and a transmission shaft that is rotated by the swivel motor.
When the amount of change in the shaft angle of the output shaft of the swing motor is A and the amount of change in the angle of the shaft generated along the transmission shaft is B, A / B ≠ 1
The transmission shaft is provided with an origin sensor for detecting a state at the origin position,
An encoder for detecting the shaft angle is provided on the output shaft of the swing motor,
The control device includes:
Stores table data indicating a correspondence relationship between the rotation speed and rotation direction of the transmission shaft and the shaft angle of the output shaft of the swing motor detected by the encoder when an origin sensor signal is detected from the origin sensor;
The rotation speed and the rotation direction of the transmission shaft are specified by the table data and the shaft angle of the output shaft of the swing motor detected by the encoder when an origin sensor signal is detected from the origin sensor. Hole sewing machine to do. When the state where the output shaft of the swing motor is at the origin position of the output shaft and the transmission shaft is at the origin position of the transmission shaft is the initial position of the swing mechanism,
Axis angle detection for obtaining an axial angle change amount of the transmission shaft from the initial position from the rotation speed and rotation direction of the transmission shaft that has been identified most recently and the axial angle of the output shaft of the swing motor detected by the encoder The boring machine according to claim 1, further comprising a processing unit. A needle up-and-down movement mechanism that moves the needle bar up and down while performing needle swinging,
A looper mechanism comprising a looper, a spreader, and a looper base that supports them;
A turning mechanism for turning the needle bar for swinging the needle and the looper base;
In a boring sewing machine comprising a control device that performs boring sewing control that forms boring seams,
The swivel mechanism includes a swivel motor that serves as a drive source, and a transmission shaft that is rotated by the swivel motor.
When the amount of change in the shaft angle of the output shaft of the swing motor is A and the amount of change in the angle of the shaft generated along the transmission shaft is B, A / B ≠ 1
An origin sensor for detecting a state at the origin position is provided on the output shaft of the swing motor,
The transmission shaft is provided with an encoder for detecting a shaft angle,
The control device includes:
Stores table data indicating the correspondence between the rotation speed and rotation direction of the output shaft of the swing motor and the shaft angle of the transmission shaft detected by the encoder when an origin sensor signal is detected from the origin sensor;
The rotational speed and direction of the output shaft of the swing motor are specified by the table data and the shaft angle of the transmission shaft detected by the encoder when an origin sensor signal is detected from the origin sensor. Hole sewing machine to do. When the state where the output shaft of the swing motor is at the origin position of the output shaft and the transmission shaft is at the origin position of the transmission shaft is the initial position of the swing mechanism,
The shaft angle for obtaining the amount of change in the shaft angle of the transmission shaft from the initial position from the rotation speed and rotation direction of the output shaft of the turning motor most recently identified and the shaft angle of the transmission shaft detected by the encoder The perforated sewing machine according to claim 3, further comprising a detection processing unit.   The boring machine according to any one of claims 1 to 4, wherein the encoder is an absolute type. A: B = 1: n or A: B = n: 1
However, n is a natural number, The boring machine according to any one of claims 1 to 5. A: B = n1: n2
However, the drilling machine according to any one of claims 1 to 6, wherein both n1 and n2 are natural numbers.

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