CZ20004676A3 - Buttonhole making sewing machine - Google Patents

Buttonhole making sewing machine Download PDF

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Publication number
CZ20004676A3
CZ20004676A3 CZ20004676A CZ20004676A CZ20004676A3 CZ 20004676 A3 CZ20004676 A3 CZ 20004676A3 CZ 20004676 A CZ20004676 A CZ 20004676A CZ 20004676 A CZ20004676 A CZ 20004676A CZ 20004676 A3 CZ20004676 A3 CZ 20004676A3
Authority
CZ
Czechia
Prior art keywords
knife
buttonhole
receiving
cutting
motor
Prior art date
Application number
CZ20004676A
Other languages
Czech (cs)
Other versions
CZ302275B6 (en
Inventor
Kenji Murai
Original Assignee
Juki Corporatioon
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP35511799 priority Critical
Priority to JP2000379070A priority patent/JP2001232082A/en
Application filed by Juki Corporatioon filed Critical Juki Corporatioon
Publication of CZ20004676A3 publication Critical patent/CZ20004676A3/en
Publication of CZ302275B6 publication Critical patent/CZ302275B6/en

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Classifications

    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B3/00Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/06Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for sewing buttonholes
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B37/00Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04Cutting devices

Abstract

The buttonhole sewing machine has a mechanism to move the fabric workpiece into the position where the buttonhole is to be stitched. A motor (8) moves the cutting blade (9) or the blade holder (11) back and forth between a start and a cutting position. The motor (8) is operated by a control (7) to move the cutter (9) or its holder (11) from the start into the cutting position, and back. The control (7) can direct the motor (8) to move the blade (9) or holder (11) into an intermediate setting between the start and cutting positions. The control (7) gives the motor (8) commands to move the blade (9) or its holder (11), between its three positions, while the fabric is being moved at the sewing machine.; The control (7) gives the motor (8) a blade movement command to shift the blade (9) or its holder (11) into an intermediate position while the fabric workpiece is being moved into place, and then directions to move the blade (9) into the cutting position when the fabric is correctly placed and is static. After cutting the buttonhole, the blade (9) is returned to the start position at a slower speed than its movements into the intermediate and cutting positions. The intermediate blade position is set within a range between the start and cutting settings so that the blade is not in contact with the fabric. Drive sensors (61, 62) register an abnormal cutting blade movement when the blade (9) or holder (11) is shifted into the cutting position, for the control (7) to repeat the blade movements through the intermediate position if there is an abnormality.; The sensors (61, 62) also register the rotary position of the blade drive motor (8) or the position of the blade (9) or its holder (11). A time control establishes if the timing of the blade movements deviate from a standard value, which would show an abnormal blade movement pattern. Speed monitors determine the rotary speed of the blade drive motor (8) and/or the movement speed of the cutting blade (9) or its holder (11), to establish if the blade (9) action is abnormal. The speed monitor (102) measures the current supply to the blade drive motor (8), for comparison with the current used in normal buttonhole cutting operations. The cutting operation gives cuts to the left and right of the buttonhole, with the control (7) giving the operating commands to the blade drive motor (8).

Description

Sewing machine for buttonhole cutting
Technical field
The present invention relates to a buttonhole sewing machine having a buttonhole sewing machine.
BACKGROUND OF THE INVENTION
The button cutting machine of a buttonhole sewing machine comprises a knife and a knife receiving device which are relative to one another. are arranged opposite each other in the vertical direction, with the sewn material interposed therebetween. For example, if the upper knife moves downwardly toward the knife receiving device before or after the buttonhole seam is formed, the suture material is cut to form the buttonhole.
In the fabric cutting device of a conventional sewing machine, an air cylinder or solenoid is used to drive the source to control the knife. This drive source is controlled so that the knife moves in a linear reciprocating motion between the original position (raised position), where the knife remains in the upper part, and the cutting position (lowered position), where the knife cuts through the sewn material.
• ·
If, however, in the known method a defect is found in the cutting of the sewn material, the drive source must usually be driven again in order to perform a new cutting. The blade must return to its original position to re-perform the punching operation. As a result, time is lost. This is particularly pronounced when an air cylinder or solenoid is used as the knife power source.
Specifically, the cloth cutting knife carries out a vertical movement between two points of the original position before cutting and the cutting position during cutting as described above. As a result, the time required for the entire cycle of the cloth cutting operation is prolonged.
Furthermore, in order to properly position the sewn material, it is necessary to increase the stroke size of the sewing presser foot. The original position of the upper blade must be positioned above the presser foot in the raised position so that the upper blade will not interfere with the setting of the sewn material. For this reason, the original blade position is necessarily raised.
Therefore, when operating a knife to perform vertical movement between two points, the original position of the knife is also raised so that the distance between the two points is increased, so that the time for the cutting cycle is prolonged.
In addition, if the blade drive is an air cylinder, a large amount of air is consumed when cutting the fabric, so that another air cylinder or sewing machine using another air cylinder is affected. In addition, if the cutting force of the sewn material is to be increased, the regulator pressure is increased,
• ·· arranged in the sewing machine. As a result, the amount of air consumed is further increased. Therefore, this effect is further emphasized.
The same problems occur in a sewing machine in which the knife is arranged in the lower part, while the knife receiving device is arranged in the upper part, while the vertical movement is performed.
SUMMARY OF THE INVENTION
In view of the above, it is an object of the present invention to provide a buttonhole sewing machine in which the time required to make the buttonhole can be shortened during abnormal operation as well as during normal operation if the buttonhole is to be formed on a buttonhole. sewn material.
Accordingly, in accordance with a first aspect of the present invention, a buttonhole sewing machine has been developed for moving a knife or a knife receiving device toward each other prior to or after the buttonhole seam has been formed, including sewn portions on the right and left sides of the sewn material. forming a buttonhole on the sewn material between the sewn parts on the right and left sides, which includes:
means for moving the sewn material to move a portion of the sewn material to form a buttonhole into a buttonhole position, driving means comprising a motor coupled to the knife or knife receiving means and for reciprocating the knife or knife receiving means between the original position and a punching position, and control means for controlling the motor to form a buttonhole for moving the knife or the device for receiving the knife from the original position to the punching position.
It is preferred that the motor which is the driving means is a motor in which the speed can be precisely controlled, such as a servomotor or a stepper motor. In addition, the movement mechanism (fabric cutter) for arranging the vertical movement of the knife or knife receiving device is arranged between the motor and the knife or knife receiving device.
In a buttonhole sewing machine according to the first aspect of the present invention, a motor for moving the knife or a knife receiving device is used as driving means. As a result, the amount of air consumed can be reduced so that the air cylinder in the sewing machine or other sewing machine using the air cylinder is not affected. In addition, the motor can guarantee that the control device can ensure accurate movement of the knife or the knife receiving device to the original position and the cutting position, and for example stop the movement.
In accordance with a second aspect, the present invention is directed to a buttonhole sewing machine in which the control means can stop the movement of the knife or
1 device for receiving the knife to the original position, to the cutting position and to the intermediate position.
For example, if the knife or knife receiving device has previously been lowered to its lower intermediate position from its original position with the presser foot lowered before cutting the sewn material, and the knife or knife receiving device moves from the intermediate position to the punching position when cutting the sewn material, there is a significant reduction in the time required for cutting, compared to when the knife or knife receiving device is lowered from its original position.
In accordance with a third aspect, the present invention is directed to a buttonhole sewing machine wherein, when the sewn material is moved by means of the sewn material movement means, the control means provides movement of the knife or knife receiving device from the original position to the intermediate position or from the intermediate position to the original position.
The movement of the buttonhole sewing material and the part of the movement of the knife or buttonhole receiving device therefore overlap each other on a time basis. As a result, the time required for substantial movement of the knife or knife receiving device corresponds to the time necessary to move from the intermediate position to the punching position during punching, so that the time required for punching can be shortened.
In accordance with a fourth aspect, the present invention is directed to a buttonhole sewing machine provided with means for moving the sewn material for
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4 4
4 • • 4 4 4
4
4 moving the knife or the knife receiving device relative to each other after forming the buttonhole seam including the right and left hand sewing portions on the sewn material and forming the buttonhole on the sewn material between the right and left hand sewn portions comprising:
drive means comprising a motor coupled to the knife or knife receiving means for moving the knife or knife receiving means to the original position, the punching position and the intermediate position, and control means for moving the knife or knife receiving means from the original position to the intermediate position when the stitched material moving means moves a portion of the stitched material to form the buttonhole into the buttonhole position after the buttonhole stitch is formed, and to move the knife or knife receiving device to the cutting position after stopping the stitched material .
In a sewing machine for sewing a hole in a sewing machine according to the fourth aspect of the present invention, the movement of the knife or the knife receiving device to the intermediate position can be stopped before part of the buttonhole sewing material reaches the buttonhole forming position. Therefore, it is possible to shorten the time required to lower the knife or the device for receiving the knife to the cutting position.
In accordance with a fifth aspect, the present invention is directed to a buttonhole sewing machine wherein the control means moves the knife or knife receiving device at a low speed relative to further movement from the original position to the intermediate position or from the intermediate position to the original position.
In a buttonhole sewing machine according to the fifth aspect of the present invention, it is possible to reduce the power consumption when the knife or knife receiving device is to be moved between the original position and the intermediate position. In addition, even if the speed at which the stitched material moving means moves the stitched material to the buttonhole-forming position is low, the movement of the knife or the knife receiving device may be synchronized with this movement. In addition, the movement from the intermediate position to the punching position is performed at high speed. Therefore, the cloth cutting can be performed very reliably.
In accordance with a sixth aspect, the present invention is directed to a buttonhole sewing machine in which the intermediate position is set immediately prior to the punching position to such an extent that the knife or knife receiving device does not contact the sewn material.
If part of the buttonhole material is to be moved to the buttonhole position, the time required to lower the knife or the knife receiving device after the buttonhole position has been reached can be reduced without damaging the stitched material by the knife.
In accordance with a seventh aspect, the present invention is directed to a buttonhole sewing machine, further comprising means for detecting a drive state.
0 *
0 0 00 00 00 0 0 ♦♦> · J for detecting extraordinary movement of a knife or knife-receiving device when the knife or knife-receiving device is to be moved to the cutting position by means of the engine the knife or the device for receiving the knife to the punching position is performed again when the means for detecting the driving state has detected an emergency.
In the buttonhole sewing machine according to the seventh aspect of the present invention, when the punching failures are detected, the punching is performed again. As a result, the sewn material can be reliably cut. In such a case, if the sewn material cannot be cut through a single repeated cutting operation, the re-cutting operation is repeated. This can minimize work delays.
In accordance with an eighth aspect, the present invention is directed to a buttonhole sewing machine, further comprising means for detecting a drive condition for detecting the extraordinary movement of a knife or knife receiving device when the knife or receiving device is to be moved into the cutting position with by means of a motor, control means for controlling the motor such that the knife or the knife receiving means moves to an intermediate position and then moves again to the punching position if the drive condition detection means has detected an emergency condition.
·· • · ·
In a buttonhole sewing machine according to the eighth aspect of the present invention, if the cutting defects are caused so that extraordinary circumstances are detected when driven by means of the drive condition detection means, then the movement of the knife or knife receiving device is interrupted to a predetermined a period of time without returning the knife or knife-receiving device to the original position when an emergency occurs, wherein the knife or knife-receiving device then moves to the punching position, whereby the punching is again performed.
Thus, the re-punching operation can be performed in a shorter time than when the knife or knife-receiving device returns to its original position, so that also in the case of punching failures the working time can be reduced compared to the known state of the art. If the movement of the knife or the knife-receiving device is interrupted, the knife or the knife-receiving device may be slightly reversed in the opposite direction to the cutting direction so that it does not reach its original position.
In accordance with a ninth aspect, the present invention is directed to a buttonhole sewing machine, wherein the drive condition detection means comprises position detection means for detecting at least one rotational position of the motor and the position of the knife or knife receiving device, and timing means for measuring the elapsed time after commencement of the drive to form a buttonhole on the sewn material based on at least one of the motor and knife operation or the knife receiving device, and, 2 < - > * • · ···· Emergency is detected based on the values detected through the position of the detection means and the timing means.
In a buttonhole sewing machine according to the ninth aspect of the present invention, if the position of the motor or knife or knife receiving device does not reach the punching position after the punching time has elapsed, it can be judged that faults have occurred, i.e. not cut through. In other words, the drive condition detection means can detect punching disturbances.
In accordance with a tenth aspect, the present invention is directed to a buttonhole sewing machine, wherein the drive condition detection means comprises a speed detection means for detecting at least one of a speed such as a motor rotation speed and a knife or gear receiving speed knives, and the emergency condition is determined based on the value detected by the speed detection means before the buttonhole is completely formed after driving the buttonhole motor to form the sewn material.
In a buttonhole sewing machine according to the tenth aspect of the present invention, if any. the speed of the motor or the knife or the knife receiving device extremely reduced before the cutting has been completed, then the speed detection means can detect the cutting faults.
In accordance with an eleventh aspect, the present invention is directed to a buttonhole sewing machine, wherein the drive condition detection means comprises current detection means for detecting the drive excitation current, and serves to detect an emergency based on the current value detected with means for detecting the current before the buttonhole is completely formed after the motor is driven to form the buttonhole on the sewn material.
In the buttonhole sewing machine according to the eleventh aspect of the present invention, punching disturbances can be detected by varying the magnitude of the excitation current, and these buttonhole disturbances can be detected very cheaply with low energy consumption costs.
In accordance with a twelfth aspect, the present invention is directed to a buttonhole sewing machine having means for moving the sewn material for moving the knife and a knife receiving means relative to each other to form a buttonhole on the sewn material between the sewn parts on right and left side and then to create a buttonhole seam, including sewn parts on the right and left side of the sewn material, which includes:
drive means comprising a motor coupled to the knife or knife receiving means and for moving the knife or knife receiving means between the original position, the punching position and the intermediate position, and ί
ί
control means for moving the knife or the device for receiving the knife from the intermediate position to the original position when the means for moving the stitched material moves a portion of the stitched material to form the buttonhole into the buttonhole position to form the buttonhole stitch.
In a buttonhole sewing machine according to the twelfth aspect of the present invention, especially when a buttonhole stitch is to be formed, including the sewing portions on the right and left side of the sewn material after the buttonhole is formed, the knife or receiving device moves the knives from the intermediate position to the original position during movement, a portion of the sewn material to form the buttonhole into the sewing position after the buttonhole is formed. It is thus possible to increase the sewing efficiency by shortening the entire cycle.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be explained in more detail by way of examples of specific embodiments thereof, the description of which will be given with reference to the accompanying drawings, in which:
Fig. 1 is a side elevational view showing the construction of the main components in the sewing machine frame in an exemplary buttonhole sewing machine according to the present invention;
Fig. 2 is a plan view showing the construction of the main components in the sewing machine frame;
99 99 • 9 99
9 ·· 9 9 9 9 9 9 9 9
• 9 9 9 99 9 9 9
• 9 9 9 9 9 9 9 9
• 9 9 9 9 9 999 9
/ Fig. 3 is a front view showing the construction of the main components in the sewing machine frame;
Fig. 4 is a rear view showing the construction of the main components in the frame of the sewing machine;
Fig. 5 is a front elevational view showing the sensing portion of the control unit and showing the main components of a buttonhole sewing machine according to the present invention;
Fig. 6 is a block diagram showing the relationship between the control unit, the motor, and the cloth cutting device of the sewing. buttonhole cutting machines according to the present invention;
FIG. 7 is a flowchart showing a method of controlling and regulating a buttonhole after the buttonhole stitching of the buttonhole sewing machine of the present invention; and FIG. 8 is a flowchart showing a method of controlling and regulating the buttonhole seam after the buttonhole sewing machine of the buttonhole sewing machine of the present invention.
Legend to Fig. 7:
- punching the buttonhole
- initiating movement into the buttonhole position
- motor 8 (low speed drop)
9 ·· 9 9 99. 99 99
9 9 9 9 9 9 9 9 9 9
• 9 9 9 99 9 9
9 · 9 9 9 9 9 9 9
·· ···· 9 9 99 9 9 999
- number of pulses = PO
- engine stop 8
- a buttonhole position
- stopping the movement of sewn material
- motor drive 8. (high speed drop)
- output from sensor 61
511 - motor drive 8. (high speed lifting)
512 - output from sensor 62
513 - Engine stop 8
514 - driving the motor 8 (high speed lifting)
515 - pulse count value = Pl
Legend to Fig. 8
5101 5102 5104 5105 5106 5107 5108 5109 5110 5111 5112 motor drive 8 (high speed drop) sensor output 61 motor drive 8 (high speed lift) pulse count value = Pl start, movement of sewn material instruction to start cutting motor drive 8_ (lift) low speed) output from sensor 62 motor stop 8 motor drive <8 high speed lift pulse value = Pl
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a buttonhole sewing machine according to the present invention will now be described with reference to the figure of Figures 1 to 8.
fafa fafa ·· fafafa fa ······ fafa fa · * * fafafa ·
As shown in Figures 1 to 4, a buttonhole sewing machine 6 according to an exemplary embodiment of the present invention consists of a base portion 2 having a nearly rectangular housing shape, a stand portion 4, erected upwardly from the base plate. 2 and from the arm portion 4 extending against the upper surface of the base portion 6 from the top of the stand portion 6, and including means for moving the sewn material (not shown) to move the sewn material to a position where the buttonhole is to be formed holes, suture means 6 for forming a buttonhole stitch on the sewn material, and a fabric cutting device 10 comprising a knife 9 which is movable vertically with the aid of a motor 6.
The means for moving the sewn material is of generally known construction and comprises a feed bar disposed on the upper surface of the sewn base portion 6 and a pressing device for pressing the sewn material on both sides of the buttonhole portion, not shown in the figures.
The feed bar moves in the transverse and longitudinal directions (in the X and Y directions) by means of a pair of pulse motors. Thus, after or before the buttonhole eyelet is formed on the sewn material, a portion of the buttonhole stitched material is set to move to the sewing start position and then moves along the buttonhole eyelet formed on the stitched material.
9 9 9 999 999 999 99 999 9999 9999 9999 999 9999 999
The sewing means 6, which are constituted by the needle end side of the needle arm portion 4 and the lateral pivoting movement of the needle by stitch after stitch, by a needle 12 attached to the lower end of the needle bar 13 by two hooks 14 arranged in the base part 2. a needle bar 13, and a rotary mechanism R for rotating the hooks 14 about a vertical axis that forms the vertical path of movement of the needle 12 to form part of the buttonhole eyelet.
The hooks 14 are driven synchronously with the vertical movement of the needle 12 and the pivoting movement of the needle 12 on the needle bar 13. As a result, a buttonhole stitch is formed at the periphery of the buttonhole eyelet formed in the stitched material that is deposited on the feed bar in cooperation with the needle 12.
The knife 9, which is part of the fabric cutting device 10, is fixed by means of a knife fastening plate 9 (not shown) to the lower end of the directly acting shaft 41 of the rack mechanism 15 facing downwardly from the arm portion 6 and movable vertically. In addition, the knife receiving device 11 is arranged on the upper surface of the base portion 2 on the side of the arm portion 4. The knife 9 moves downward in a vertical direction to the knife receiving device 11. As a result, the sewn material that is placed on the feed bar is cut to form a buttonhole eyelet.
The fabric cutting device 10 further has the following construction.
have a well-known rod 13 arranged to carry out a vertical movement.
«·· ····
The motor 6 is fixed to the frame by a support plate 20 in the base part 2, its output shaft facing upwards. The spindle 24, arranged vertically in the stand portion 3, has the upper and lower ends housed in bearings 21 and 22 attached to the base portion 6 and in the bearing unit 23 attached to the stand portion 3, the lower end of which extends into the base portion 2.
The drive shaft 26 arranged on the side face in the arm portion 4 is rotatably mounted in the bearings 25. The coupling mechanism 29 for transmitting the rotational movement of the ball screw 24 to the rotary movement of the drive shaft 26 is formed by a coupling 27 connected to the ball screw 24 and a lever. 28, pivotally connected to one of the ends of the drive shaft 26. A lever receiving device 26a mounted to the drive shaft 26 is disposed opposite to engage the lower surface of the lever 28.
The gear 32 attached to the lower end of the ball screw 24 engages the gear 31 attached to the drive shaft of the motor.
The nut 33 is screwed onto the spindle 24 so that it moves vertically when the spindle 24 rotates. The bushing 34 is attached to the nut 33, the guide shaft 37 mounted vertically to the arm portion 4 is movable vertically in a bearing 36 arranged in the bushing 34. As a result, when the ball screw 24 is rotated, the bushing 34 it moves vertically together with the nut 33.
φ »· · · • • φ φ φ φ φ
φ · · · · · φφ φφ
··
The link 27 and the lever 28 are arranged as follows to rotate the drive shaft 26 in the lever sliding device 26a together with the vertical movement of the housing 34.
The link 27 has one end rotatably mounted on a coupling shaft 38 disposed within the housing 34, the other end rotatably mounted on a connecting shaft 39 attached to the lever 28. When the housing 34 moves down with the nut 33 by rotating the ball screw 24 , the end of the lever 28 is pulled down along with the drop of the link 27 so that the lever 28 rotates using the drive shaft 26 as the axis of rotation. As a result, the lever engaging device 26a engaging the lower end face of the lever 28 is pushed downwardly so that the drive shaft 26 rotates integrally with the lever engaging device 28a.
The gear 40 is attached to the other end of the drive shaft 26, the directly acting shaft 41 of the rack mechanism 15 having a rack 42 with which the gear 40 engages. The direct acting shaft 41 moves downwardly via the rack 42 while the gear 40 is rotating.
The drive shaft 26 is provided with a coil return spring 43. This coil return spring 43 twists and deforms as the drive shaft 26 rotates to accumulate a force to press the drive shaft 26 back in the opposite direction to the direction of rotation.
Therefore, if the lever 28 rotates in the opposite direction to the lever insertion device 26a. Thus, the drive shaft 26 &apos;
9 9 · ·> * • · 0 · 99
9 9
9 · 9 9 · ···
99 '
10 · * • * *
9 9
9 9
9. 99 9 9 rotates to drive the knife 9 upward by the driving force of the coil return spring 43.
The rack mechanism 15 is attached to the arm portion 4 of the sewing machine so that its horizontal position can be adjusted while being housed in an almost cylindrical directly acting metal part 44 having a notch formed on the gear side. In addition, the convex portion is arranged at two locations in the circumferential direction on the outer surface of the rack mechanism 15, wherein the inner surface of the directly acting metal part 44 is provided with a groove 45 for receiving the convex portion sliding vertically. that it doesn't rotate.
As shown in FIG. 5, in a buttonhole sewing machine 11, the arm portion 4 thereof includes a slot plate 60 for detecting the condition of the knife 9, and a sensor 61 for sensing the cutting position (lowered position) of the knife 9 by slot detection. and a sensor 62 for sensing the original position (raised position) of the knife 9 by detecting the slot portion of the slot plate 60 so that the position of the knife 9 can be determined based on the angle of rotation of the drive shaft 26.
The slot plate 60 is secured to the drive shaft by means of a ring 63, wherein the sensors 61 and 62 are fixed in a predetermined position on the side surface of the arm portion 6 by the sensor mounting plate 64 and the sensor mounting plate 65.
4.
* * »* *.
'4 4 *
444 ·
4444
4 4 4 4 4
44 4444
The operation and operation of the fabric cutting device 10 of the present invention will now be described.
When the knife 9 is set to the raised position, the ball screw 24 is rotated by forward rotation of the motor 8 so that the nut 33 and the sleeve 34 move down along the ball screw 24. At the same time, the link 27 moves down together with the ball spindle 24 and the sleeve 34 as it rotates using the link shaft 38 as the axis of rotation.
The lever 28 connected to the link 27 via the link shaft 39 rotates in the direction of arrow A in Fig. 4 using the drive shaft 26 as the axis of rotation when the link 27 is lowered so that the drive shaft 26 rotates through the lever insertion device 26a. 28.
If . the drive shaft 26 rotates, so the slot plate 60 attached to the drive shaft 26, the ring 63, and the gear 40 also rotate such that the directly acting shaft 41 engaging the gear 40 moves perpendicularly downward.
When the directly acting shaft 41 is lowered, the knife 9 corresponds to the knife receiving device 11. At this point, the sensor 61 detects the rotation of the slot plate 60, thereby detecting that the knife 9 has reached the cutting position.
When the motor 6 rotates in the opposite direction, the nut 33, the housing 34 and the link 27 move upwards. Then, the lever 27 rotates in the opposite direction of arrow A of FIG. 4,
II · Φ »» φ • • • • • •
φ. φ φ φ φ φ φ • Φ;
Φφ
Φ> ΦΙ
Φ
Φ
ΦΦΦΦ so that the pressure of the lever sliding device 26a on the lever 28 is released.
As a result, the drive shaft 26 rotates in the opposite direction by the action of the coil return spring 43 so that the knife 9 is lifted and thus moves away from the knife receiving device 11. When the drive shaft 26 rotates, the slot plate 60 and ring 63 also rotate, with the sensor 62 sensing the return of the blade 9 to its original position.
As shown in the block diagram of FIG. 6, the motor 8 is a servomotor, the rotation of which is controlled by the control unit 1 via the motor driver 101. In addition, there is a generally known current sensor 102 for measuring the excitation current representing the output. The excitation current value of the motor 2 represents the output from the current sensor 102 to the control unit 7.
In addition, the motor 38 is provided with a generally known coding device 103 for transmitting a predetermined number of pulses for each rotation of the motor 8. The pulse output from the coding device 103 represents an input to the control unit 2 and to the motor driver 101.
Furthermore, by counting the number of pulses of the coding device 103 over a period of time, the engine speed 2 can be calculated in the control unit 2.
Instead of the means for detecting punching disturbances, it is possible to decide that punching disturbances occur when the speed of movement of the knife 9 is significantly reduced (
9 '
9; 9 • 9
9
9 β 9 ·
»» 9)
999 »9 * 9
9 9 9 • 9 '99
9999 the movement speed reaches zero) before the knife 9 reaches the punching position.
Specifically, a decision is made by calculating the speed of the knife 9 or the rotation speed of the motor 13 corresponding to the speed of the knife 9, based on the timing function of the internal computer of the control unit 7 and the input value sent from the sensors 61 and 62. and depending on whether the speed of rotation of the motor 8 or the speed of movement of the knife reaches zero before the knife 9 reaches the cutting position.
In addition, pruning disturbances can be detected depending on whether the output value transmitted from the current sensor 102 to the control unit 11 has not changed before the knife 9 has reached the cutting position. In the case where the pulse that is transmitted from the encoder 103 to the motor driver 101 has not been sent to the motor driver 101 for a constant time, the power supply to the motor 8 is reduced. determining that a punching failure has occurred if the current value in the current sensor 102 has been significantly reduced before the blade 9 has reached the punching position.
The exciter 101 of the motor 8 can limit the maximum value of the excitation current supplied to the motor by control with the control unit 2. Therefore, the exciter 101 of the motor 2 and the control unit 8 can limit the maximum value of the excitation current to be small before the blade 9 reaches a predetermined position, or before the motor rotation position 2 reaches a predetermined position, and may limit the maximum excitation value
4
4.
444 4444
44 •> 4 4 '
4 44
4 4 4 'f 4
4 '4 4 4
4 '4 4.
44 '44'
4/4 4 · * '4 4 4'
4 4
4 4
44 '4444 of the electric current of the motor 8 so that it is greater than the limit after reaching a predetermined position. In other words, the driver 101 of the motor 8 and the control unit 7 act as means for limiting the electric current.
The controller further comprises a microcomputer having a central CPU, a random access memory, and a non-volatile ROM, the input / output interface being connected to the microcomputer via a busbar, not shown in the illustration.
A control program is stored in the ROM, including input processing from the input / output interface and processing for operating the sewing machine based on various input data via the input / output interface. In addition, the permanent ROM stores data on the number of pulses necessary to detect punching faults and the time of blade movement 9.
The method of controlling and regulating the sewing machine to make the buttonhole after the buttonhole cutting is completed will now be described, based on the flow diagram shown in FIG. 7. The designation Sn represents the number of the respective step, where n = 1, 2, 3 etc.
In particular, the buttonhole cutting subroutine (S1) for performing buttonhole cutting is performed before the buttonhole is formed. When the buttonhole punching is completed, the means for moving the sewn material is driven to move the buttonhole portion of the sewn material to the buttonhole position where the knife 9 and the knife receiving device 9 (S2) are arranged.
· ♦ - •• ϊ »♦» »
W · W W W * * * * * * * *
· ♦ · ♦ «,« ···
The maximum excitation current value is limited to rotate the motor 8 in a low current forward direction such that the blade 9 moves downward at a low speed at the start of the buttonhole position (S3).
If the count value of the number of pulses that is transmitted from the coding apparatus 103 reaches a predetermined number of PO pulses (S4), that is, the knife 9 is lowered to an intermediate position just before the lowered position 9 motor 8 stopped (S5).
Further, when a portion of the buttonhole-forming material is moved to the buttonhole-forming position (S6), the means for moving the suture material is stopped (S7).
The motor rotates in the forward direction at high speed (S8) so that the blade -9 moves down from the intermediate position to the punching position (lower position) at high speed so that the sewn material is punched. The excitation current limitation is eliminated for driving the motor Q with the help of a high current. As a result, the blade 8 moves downward from the intermediate position to the cutting position at high speed.
It is then determined whether the output is detected from the sensor 61 at a predetermined time T after the start of the drop from the intermediate position, i.e. whether it has been determined that the blade 9 has reached the cutting position (S9, S10).
If the output is detected at a predetermined time T, the motor & rotates in the opposite direction at high speed (S1).
0 /
0 »00 9»: X 000
00 '
0 0 0 '9 9
0 0 0
0. 0 0
0 '00.
100 '··' * 0 9 9 • 0
0 9 '
9 0 «0 .. 0000
If the output from the sensor 62 has been detected, that is, the blade 9 is raised to its original position (S12), the motor is stopped (S13). The sensing time t for a predetermined time T is sensed using the clock pulse of the CPU and the internal counting or timing device.
If output from sensors 61
set time T, it means that
not run on sewn material (S9
in the opposite direction at high speed, high speed (S14).
not found in advance it is decided that the knife 9
S10), the motor 8 rotates so that the knife 9 is lifted
Then, if the count value of the number of pulses that are sent from the coding apparatus 103 reaches a predetermined number of P1 pulses (S15), the motor 8 rotates again in the forward direction so that the blade 9 moves down at a high speed (S8). That is, unless it is confirmed that the fabric has been cut at a predetermined time T in steps S9 and S10, the motor 8 is repeatedly driven in steps S8 to S10 and in steps S14 and S15. In other words, repeated cutting is performed.
As described above, the knife 9 moves from its original position (lifted position) to an intermediate position located directly in front of the punching position, with a portion of the buttonhole sewing material moving with the sewing position to the buttonhole position by means of the buttonhole. movement of sewn material. Therefore, the knife 9 simply moves from an intermediate position to a cutting position over a very short path during cutting. As a result, the working time required for die cutting can be reduced.
© *
© '. ©99 99 »- · ©» © * »; *> · © © * - ·; and · · © · <© ·! a and © ©: © · © in © · * ·· ·· ’aa» © ·· © ·
Furthermore, if the movement of the sewn material and the movement of the knife 9 from the original position to the intermediate position are performed simultaneously, the power consumption of the driving motor 8 can be reduced by means of a low excitation current at low speed. On the other hand, when the knife 9 is to be moved from the intermediate position to the punching position, the motor 8 is actuated by means of a high excitation current. As a result, the knife 9 can be moved at high speed so that punching can be performed very reliably. In addition, the time required for die cutting may be shortened.
By repeating the punching process in the event of a defective punching process as described above, the buttonhole can be formed very reliably. In addition, if the knife 9 does not return to its original position, but the knife 9 is stopped or the knife 9 is slightly raised during re-cutting, the time required to re-cut may be shortened.
Next, a method of controlling and regulating the sewing machine to make the buttonhole before punching the buttonhole will be described, based on the flow chart of FIG. 8.
In particular, the sewn material is positioned on the feed bar such that a portion of the sewn material for forming the buttonhole is arranged in the position of the feed bar for forming the buttonhole. The relationship between the forward and reverse rotation of the motor and the vertical movement of the blade 9 is the same as described above.
. · »♦ * • 0 0 Ί
4 · · · ·
First, the motor 13 is driven at high speed with the help of a high excitation current so that the blade 9 sinks (S101). If the sensor 61 generates a detection signal at a predetermined time T (S102, S103), that is, it is determined that the knife 9 has reached the punching position (lowered position), the motor Ej is driven at high speed so that the knife 9 rises (S104) .
If, then, the count value that is sent from the encoder 103 reaches a predetermined number of P1 pulses (S105), that is, the knife 9 has reached the intermediate position, the suture material is moved by the suture material movement means (S106). and instructing to initiate buttonhole cutting mode (S107). At the same time, the motor 8 is driven at a low speed so that the knife 9 is further lifted (S108). If the sensor 62 then generates a detection signal (S109), that is, the knife 9 has reached the raised position, the motor 11 is stopped (S110).
Conversely, if the detection signal of the sensor 61 is not generated at a preset time T, that is, the knife 9 has not reached the cutting position (lowered position) in steps S103 and S103, the motor is driven at high speed so that the knife 9 is lifted. If the counted number of pulses that are sent from the encoder 103 reaches a predetermined number of P1 pulses (S112), the motor 8 is driven at a high speed so that the blade 9 drops again (S101).
Description of the punching mode will be omitted.
In accordance with the above-mentioned control and regulation method, if the buttonhole is to be formed prior to cutting, the knife 9 is lifted and a portion of the sewn material to form a cut. ..
• 4 · »· · · * ♦ ·. ·. <
The buttonhole moves from the buttonhole position to the sewing position with the help of (means for moving the sewn material) simultaneously over the overall forming a buttonhole, wherein the knife 9 is then raised to such a position that it does not interfere with the sewn material. Therefore, the first sewing step is initiated before the final cutting step is completed. As a result, it is possible to substantially reduce the working time required for cutting.
If the blade 9 is simply to be moved from the cutting position to a position where the blade 9 does not interfere with the sewn material after cutting, the motor 8 is driven by a high excitation current for moving the blade 9 at high speed, thereby reducing the time required for cutting . Thereafter, the movement of the knife 9 to the original position and the movement of the sewn material are performed simultaneously. Specifically, under conditions where the time required to move the knife 9 does not affect the time required to operate the sewing machine, the power consumption can be reduced by driving the motor 8 with the help of a low excitation current.
By repeating the punching in case of a punching punch as mentioned above, a buttonhole can be reliably formed. In addition, if the knife 9 does not return to its original position but the knife 9 descends or the knife 9 is slightly raised during re-cutting, the re-cutting working time can be further reduced compared to the prior art.
With the buttonhole sewing machine of this exemplary embodiment, the functions and effects described with reference to the flow chart can be achieved.
»**.
· 94 · 94 · 4
4 44
4 4 4
4 4 4
44 • 4 ♦ · ♦ «·
4 '*
4 ·
444 9
By using the engine (3 instead of the air cylinder), the air cylinder of the sewing machine or other air cylinder of the sewing machine can be prevented from being affected by the use of a large amount of air during fabric cutting.
In addition, the stroke of the presser foot is increased so that the sewn material can easily be set on the feed bar. Consequently, even if the raised position (original position) of the knife 9 or the knife receiving device 11 is raised, the knife 9 or the knife receiving device 11 moves from the intermediate position to the punching position during punching. Therefore, the time required for cutting is not prolonged.
The vertical positions of the knife 9 and the knife receiving device 9 can be interchanged so that the knife receiving device 11 can move from the original position to the punching position.
Even if the knives 61 and 62 for detecting the position of the knife 9 based on the rotation angle of the drive shaft 26, as shown in FIG. 5, are not arranged, each knife position 9 can be detected by calculating the output from the coding device 103 in the control Specifically, the number of pulses from the coding device 103 necessary to move the knife 9 from its original position to the intermediate position and to the punching position is measured in advance and stored in memory means such as the memory in the control unit. thus, it can be calculated to determine the position of the knife 9.
449 · ·· * 9 ··.
9 9
4 9 »· 99 9 9 · · ·
9 9 9
9 *
9999
By measuring the time required to pass each position with the aid of sensors 61 and 62, it is also possible to measure the speed of movement of the knife 9.
Industrial applicability
In a buttonhole sewing machine according to the first aspect of the present invention, a motor for moving the knife or a knife receiving device is used as driving means. As a result, the amount of air consumed can be reduced so that the air cylinder in the sewing machine or other sewing machine using the air cylinder is not affected. In addition, the motor can guarantee that the control device can ensure accurate movement of the knife or the device for receiving the knife to the original position and the cutting position, and for example stop the movement.
In a buttonhole sewing machine according to the second aspect of the present invention, if, for example, the knife or knife receiving device has previously been lowered to its lower intermediate position from its original position, the presser foot being lowered before cutting the sewn material, and the knife or receiving device The blade moves from the intermediate position to the punching position when punching the sewn material, significantly reducing the punching time compared to when the knife or the knife receiving device is lowered from its original position.
In accordance with a third aspect, the present invention is directed to a buttonhole sewing machine wherein the movement of the sewn material to form the buttonhole and a portion of the movement of the knife or knife receiving device for
·· ···· buttonhole formation therefore overlap each other on a time basis. As a result, the time required for substantial movement of the knife or knife receiving device corresponds to the time necessary to move from the intermediate position to the punching position during punching, so that the time required for punching can be shortened.
In a buttonhole sewing machine according to the fourth aspect of the present invention, the movement of the knife or knife receiving device to the intermediate position may be stopped before a portion of the buttonhole sewing material reaches the buttonhole positioning position. Therefore, it is possible to shorten the time required to lower the knife or the device for receiving the knife to the cutting position.
In a buttonhole sewing machine according to the fifth aspect of the present invention, it is possible to reduce the power consumption when the knife or knife receiving device is to be moved between the original position and the intermediate position. In addition, even if the speed at which the stitched material moving means moves the stitched material to the buttonhole-forming position is low, the movement of the knife or the knife receiving device may be synchronized with this movement. In addition, the movement from the intermediate position to the punching position is performed at high speed. Therefore, the cloth cutting can be performed very reliably.
In accordance with a sixth aspect, the present invention is directed to a buttonhole sewing machine wherein, when a portion of the buttonhole sewing material is to be moved to the buttonhole positioning position, the fafa. Thus, the time required to lower the knife or the knife receiving device after reaching the buttonhole position can be shortened without damaging the sewn material by the knife.
In the buttonhole sewing machine according to the seventh aspect of the present invention, when the punching failures are detected, the punching is performed again. As a result, the sewn material can be reliably cut. In such a case, if the sewn material cannot be cut through a single repeated cutting operation, the re-cutting operation is repeated. This can minimize work delays.
In a buttonhole sewing machine according to the eighth aspect of the present invention, if the cutting defects are caused so that extraordinary circumstances are detected when driven by means of the drive condition detection means, then the movement of the knife or knife receiving device is interrupted to a predetermined a period of time without returning the knife or knife-receiving device to the original position when an emergency occurs, wherein the knife or knife-receiving device then moves to the punching position, whereby the punching is again performed.
Thus, the re-punching operation can be performed in a shorter time than when the knife or knife-receiving device returns to its original position, so that also in the case of punching failures the working time can be reduced compared to the known state of the art. If the movement of the knife or the knife-receiving device is interrupted, the knife or the knife-receiving device may be slightly
returned in the opposite direction to the cutting direction so that it does not reach its original position.
In a buttonhole sewing machine according to the ninth aspect of the present invention, if the position of the motor or knife or knife receiving device does not reach the punching position after the punching time has elapsed, it can be judged that faults have occurred, i.e. is not cut through. In other words, the drive condition detection means can detect punching disturbances.
In a buttonhole sewing machine according to the tenth aspect of the present invention, if the speed of the motor or knife or knife receiving device is extremely reduced before the cutting is complete, then the speed detection means can detect cutting failures.
In the buttonhole sewing machine according to the eleventh aspect of the present invention, punching disturbances can be detected by varying the magnitude of the excitation current, and these buttonhole disturbances can be detected very cheaply with low energy consumption costs.
In a buttonhole sewing machine according to the twelfth aspect of the present invention, especially when a buttonhole stitch is to be formed, including the sewing portions on the right and left side of the sewn material after the buttonhole is formed, the knife or receiving device moves knives from an intermediate position to the original position during movement, a portion of the sewn material to form a buttonhole
To the sewing position after the buttonhole has been created. It is thus possible to increase the sewing efficiency by shortening the entire cycle.

Claims (12)

  1. A buttonhole sewing machine for moving a knife or a knife receiving device towards each other prior to or after forming a buttonhole seam, including stitched portions on the right and left side of the stitched material, and for forming a buttonhole on the stitched material between the stitched portions on the right and on the left, comprising:
    means for moving the sewn material to move a portion of the sewn material to form a buttonhole into a buttonhole position, driving means comprising a motor coupled to the knife or knife receiving means and for reciprocating the knife or knife receiving means between the original position and a punching position, and control means for controlling the motor to form a buttonhole for moving the knife or the device for receiving the knife from the original position to the punching position.
  2. A buttonhole sewing machine according to claim 1, characterized in that the control means can stop the movement of the knife or of the knife receiving device to the original position, the cutting position and the intermediate position.
  3. A buttonhole sewing machine according to claim 2, characterized in that when the sewn material is moved by means of the sewn material movement, the control means move the knife or the knife receiving device from the original position to the intermediate position or from the intermediate position to the original position. position.
  4. 4. A buttonhole sewing machine, provided with means for moving the sewn material, for moving a knife or a device for receiving a knife relative to each other after forming a buttonhole seam, including sewing portions on the right and left side of the sewn material and forming a buttonhole. on the sewn material between the sewn portions on the right and left sides, characterized in that it comprises:
    drive means comprising a motor coupled to the knife or knife receiving means for moving the knife or knife receiving means to the original position, the punching position and the intermediate position, and control means for moving the knife or knife receiving means from the original position to the intermediate position when the stitched material moving means moves a portion of the stitched material to form the buttonhole into the buttonhole position after the buttonhole stitch is formed, and to move the knife or knife receiving device to the cutting position after stopping the stitched material .
  5. A buttonhole sewing machine according to claim 2 or 4, characterized in that the control means move the knife or the knife receiving device at a low speed with respect to further movement from the original
    9 9999> · 99 99 9 «•» 9 9 9 9 9 9 9 9 9 9 9 9
    9 9 9 9 9 9 9 ·· »· 99 9 · 99 to the intermediate position or from the intermediate position to the original position.
  6. A buttonhole sewing machine according to claim 2 or 4, characterized in that the intermediate position is set immediately before the die-cutting position in such a range that the knife or the knife-receiving device does not touch the sewn material.
  7. The buttonhole sewing machine of claim 1, further comprising means for detecting a drive condition for detecting the extraordinary movement of the knife or the knife receiving device when the knife or the knife receiving device is to be moved into the cutting position by motor control means so that the movement of the knife or the device for receiving the knife to the punching position is performed again when the means for detecting the driving state has detected an emergency condition.
  8. The buttonhole sewing machine according to claim 2 or 4, further comprising means for detecting a driving condition for detecting the extraordinary movement of the knife or knife receiving device when the knife or receiving device is to be moved to the cutting position with by means of a motor, control means for controlling the motor such that the knife or the knife receiving means moves to an intermediate position and then moves again to the punching position if the drive condition detection means has detected an emergency condition.
  9. A buttonhole sewing machine according to claim 7, wherein the means for detecting the driving state comprises means for detecting a position for detecting at least one rotational position of the motor and the position of the knife or knife receiving device, and timing means for measuring elapsed time. upon initiation of the buttonhole-forming drive on the sewn material based on at least one of the operations of the motor and the knife or knife receiving device, and the emergency is detected based on the values detected by the position of the detection means and the timing means.
  10. The buttonhole sewing machine according to claim 7, wherein the means for detecting the driving state comprises means for detecting a speed for detecting at least one of the speeds, such as the speed of rotation of the motor and the speed of movement of the knife or the knife receiving device. the emergency is detected based on the value detected by the speed detection means before the buttonhole is completely formed after driving the buttonhole motor to form the sewn material.
    © «Holes accordingly. that
    9 9 © * '♦ 9
    39 · · · · 9999
  11. The button cutting sewing machine of claim 7, characterized in that the means for detecting the driving state comprises current detection means for detecting the field current of the motor, and serves for detecting an emergency based on the current value detected by the current detection means prior to complete button formation. the buttonhole after the motor is driven to form a buttonhole on the sewn material.
  12. A buttonhole sewing machine, provided with means for moving the sewn material, for moving the knife and a knife receiving device relative to each other to form a buttonhole on the sewn material between the sewn portions on the right and left sides and then to form the buttonhole holes, including sewn parts on the right and left sides of the sewn material, characterized in that it comprises:
    drive means comprising a motor coupled to the knife or knife receiving means for moving the knife or knife receiving means between the original position, the punching position and the intermediate position, and control means for moving the knife or knife receiving means from the intermediate positioning to the original position when the suture material moving means moves a portion of the suture material to form the buttonhole into the suture position for forming the buttonhole prior to forming the buttonhole stitch.
CZ20004676A 1999-12-14 2000-12-14 Buttonhole sewing machine CZ302275B6 (en)

Priority Applications (2)

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JP35511799 1999-12-14
JP2000379070A JP2001232082A (en) 1999-12-14 2000-12-13 Buttonholing sewing machine

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JP4059477B2 (en) * 2001-12-11 2008-03-12 Juki株式会社 Buttonhole sewing machine
JP3779921B2 (en) * 2001-12-13 2006-05-31 Juki株式会社 Buttonhole sewing machine
JP2004173783A (en) * 2002-11-25 2004-06-24 Juki Corp Cloth cutting device for sewing machine
JP2006087808A (en) * 2004-09-27 2006-04-06 Brother Ind Ltd Eyelet holing sewing machine
JP5130091B2 (en) * 2008-03-25 2013-01-30 Juki株式会社 Cloth cutting device
JP2009240379A (en) 2008-03-28 2009-10-22 Juki Corp Button hole sewing machine
JP5318444B2 (en) * 2008-04-07 2013-10-16 Juki株式会社 Buttonhole sewing machine
JP5329340B2 (en) * 2008-08-29 2013-10-30 Juki株式会社 Foreign matter detection device for hole sewing machine
JP2010069205A (en) * 2008-09-22 2010-04-02 Juki Corp Cloth cutting device of hole stitching machine

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JPH04240479A (en) * 1991-01-23 1992-08-27 Mitsubishi Electric Corp Sewing maching controller
US5361713A (en) * 1992-02-05 1994-11-08 Brother Kogyo Kabushiki Kaisha Work sheet cutting blade with continuous blade displacement detection
JP2674479B2 (en) * 1992-10-27 1997-11-12 三菱電機株式会社 Sewing machine control device and sewing machine control method
JP3276891B2 (en) * 1997-06-27 2002-04-22 ジューキ株式会社 Buttonhole sewing machine
DE19807771C1 (en) * 1998-02-24 1999-04-15 Duerkopp Adler Ag Buttonhole sewing machine

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CN1153861C (en) 2004-06-16
DE10062259A1 (en) 2001-07-19
CN1305028A (en) 2001-07-25
DE10062259B4 (en) 2005-11-24
CZ302275B6 (en) 2011-01-26
JP2001232082A (en) 2001-08-28

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Effective date: 20111214