CZ20031258A3 - Control unit for sewing machine needle thread - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention which remains on the back of the sewn textile and is used to start the sewing operation.

BACKGROUND OF THE INVENTION

In order to perform stitches without damage at the beginning of the sewing operation and to ensure an adequate length of the needle thread remaining at the tip of the needle at the beginning of the sewing operation, a needle sewing device is already known which pulls the end of the needle thread inserted into the needle for the first stitch. a rear side of the needle board by means of a hook at the beginning of the sewing operation, and which grasps the end of the needle thread thus extending at the back of the needle board.

Procedures for gripping the end of the needle thread. are described, for example, in Japanese patent specification JP 2,671,478 and Japanese patent application publication JP-A-2000-325,683.

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These methods are useful in terms of function for catching the end of the needle thread.

SUMMARY OF THE INVENTION

The present invention is intended to solve the following problems.

However, in order to use the needle thread catcher and to provide a reasonable length of needle thread remaining on the back of the fabric at the beginning of the sewing operation, the needle thread must be retained and held stably at the beginning of the sewing operation. The timing at which the needle thread must be held and the needle thread tension must be adjusted in accordance with the respective sewing requirements.

If it is identified and decided whether or not it should be. a needle sewing device is used with respect to the sewing requirements (i.e. with regard to the sewn textile or the type of needle thread), the tension of the used needle thread at the beginning of the sewing operation as well as the speed of the sewing machine must be switched according to the needle thread catcher is in operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improvement in the quality of the sewn product or in the operability and productivity of the sewing machine by providing a reasonable length of needle thread remaining at the beginning of the sewing operation.

It is a further object of the present invention to improve the quality of the sewn product or the operability and productivity of the sewing machine by ensuring an adequate length of start of the sewing operation, without the further object of this needle unit. threads for sewing needle thread, remaining with regard to sewing requirements.

In addition, it is still an object of the present invention to provide a control machine that controls and controls the gripping operation of the sewing thread, the sewing thread tension and the speed of the sewing machine, and which ensures appropriate operations at the beginning of the sewing operation for each sewing request.

The above problems are solved by the following means in accordance with the present invention.

In order to solve the above problems, in accordance with the present invention according to claim 1, a needle thread control unit has been developed in a sewing machine 100 having a needle thread tension applying device (yarn tension adjusting device 45) which applies tension to the needle thread. and may vary this tension, and the needle thread catching device 60 that grasps the end of the needle thread passing through the needle 52 at a position below the needle plate 50 at the beginning of the sewing operation, moves the grasped needle thread to a position distant from the needle vertical travel path; releases the gripped end of the needle thread after performing a predetermined number of stitches, the control unit comprising:

a voltage control means (control unit 38) that predetermines the tension to be achieved at the beginning of the sewing operation before gripping the needle thread by the needle thread catching device such that it is greater than the tension to be achieved during the sewing operation after release the needle thread by the needle thread catching device.

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According to the invention according to claim 1, the device for applying tension to the needle thread is controlled by means of the voltage control means such that the tension reached at the beginning of the sewing operation before the needle thread catching device grasps the needle thread is greater than the tension. achieved during the sewing operation, after the needle thread catcher has released the needle thread.

As a result, excessive supply of the needle thread before the needle thread catching device grasps the needle thread is suppressed, wherein the length of the needle thread remaining on the back of the fabric at the beginning of the sewing operation: can be kept adequate.

As a result, the needle thread on the back of the fabric is prevented from tangling, or the needle thread is tangled. on the needle thread catching device as a result; allowed to perform a stable initial sewing operation.

In accordance with the present invention of claim 2, the sewing machine control unit of the sewing machine of claim 1 further comprises a voltage setting means (control unit 38 and control panel 74a) to be achieved at the beginning of the sewing operation prior to gripping the needle thread by the sewing device. collecting the needle thread, the voltage control means controlling the needle thread tensioning device based on the tension set by the voltage adjusting means.

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It is to be understood that the subject matter of the invention according to claim 2 provides the same advantages as achieved by the subject matter of the invention according to claim 1.

In particular, the tension adjusting means adjusts the tension to be achieved at the beginning of the sewing operation before gripping the needle thread by the needle thread catching device.

As a result, the appropriate tension is adjusted and adjusted depending on the friction that occurs between the fabric and the needle thread, or the extension of the needle thread, which varies depending on the fabric sewn or the type of needle thread, so that the sewing machine can properly work.

In accordance with the present invention according to claim 3, the needle thread control unit of the sewing machine according to claim 1 or 2 further comprises:

means for adjusting the gripping operation (control unit 38 and control panel 74a) for adjusting whether or not to perform the sewing operation of the needle thread resulting from the activation of the needle sewing device, and when the sewing operation of the needle thread is set, adjusting the gripping operation so that the needle thread tension is higher than the tension to be achieved at the time of the sewing operation, and the tension control means controls the needle thread tension device such that the needle thread tension is higher than the tension that the needle thread has be achieved at the time of the sewing operation if the needle sewing operation is adjusted and so that the tension of the needle thread reached at the beginning of the sewing operation is the same as the tension to be achieved at the time of the sewing operation, if performing a sewing thread sewing operation It is not set.

It is to be understood that the subject matter of the invention according to claim 3 provides the same advantages as achieved by the subject matter of the invention according to claim 1 or 2.

The means for adjusting the gripping operation adjusts the operation depending on whether or not the needle-threading device performs the gripping operation of the needle-thread.

Switching may be performed between performing the needle thread gripping operation to be performed by the needle thread gripping device, or by not performing the needle thread gripping operation to be performed by the needle thread gripping device.

The sewing machine may be driven on the basis of the needle thread tension adjusted to match whether or not the needle thread gripping operation should be performed.

Thus, when the sewing machine is commissioned, or when the sewing operation is initiated, the needle thread tension reached at the start of the sewing operation is controlled and controlled so that the sewing thread does not slip out of the needle, thereby increasing operability and productivity. .

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In accordance with the present invention, according to claim 4, a needle thread control unit 60 has been developed in a sewing machine 100 having a needle thread catcher that engages the needle thread end passing through the needle at a position below the needle plate 50 at the start of the sewing operation. the needle yarn to a position spaced from the needle vertical travel path and releases the gripped end of the needle yarn after performing a predetermined number of stitches, the control unit comprising:

means for adjusting the angle of the main spindle (the control unit 38 and a control panel 74a) for adjusting the rotational angle of the main spindle as a device for catching the needle thread has grasped the needle thread, the means for determining the angle of the main spindle (control unit 38) P ^ro detecting the rotational angle of the main spindle, detecting means (control unit 38) for detecting whether the main spindle angle of rotation detected by the main spindle angle detection means is or does not coincide with the main spindle angle of rotation set by the main spindle angle adjusting means, and needle gripping control means the yarn (control unit 38) for performing the needle sewing control operation to be performed by the needle yarn catching device when the detecting means determines that there is agreement between the rotational angles of the main thread chains.

In accordance with the subject matter of the invention according to claim 4, there is a timing in which it has a needle yarn catching device

Grab the needle thread, set and controlled by the angle of the main spindle of the sewing machine.

The adjustment of the length of the needle thread remaining after grasping the needle thread (i.e. the length of the needle thread remaining on the back of the fabric) can be varied. The needle thread can be gripped under optimal conditions depending on the fabric material or the type of needle thread.

The object of the present invention according to claim 5 provides a needle thread control unit of a sewing machine 100 having a needle thread catching device 6Ό that engages the needle thread end passing through the needle at a position below the needle plate 50 at the beginning of the sewing operation. remote from the needle travel, and releases the grasped end of the needle thread after performing a predetermined number of stitches, the control unit comprising:

means for adjusting the gripping operation (control unit 38 and control panel 74a) to provide adjustments depending on whether or not the needle thread gripping operation resulting from the activation of the needle gripping device has been performed, and sewing machine motor control means (control unit 38), which preset the initial speed of the sewing machine motor to be achieved at the beginning of the sewing operation, unless the means for adjusting the gripping operation has set the sewing operation of the needle thread to be lower than the speed to be achieved at the time of the operation grasping the needle thread.

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In accordance with the present invention according to claim 5, if the needle thread catcher does not grasp the needle thread, the sewing machine engine control means controls and controls the initial speed of the sewing machine engine to be reached at the start of the sewing operation so as to be lower than the speed to be achieved when the needle thread gripping operation is adjusted, thereby preventing the needle thread from slipping out of the needle handle.

In the meantime, if the needle thread catcher can grasp the needle thread, thereby preventing the needle thread from slipping out of the needle loop, the initial speed of the sewing machine motor to be reached at the start of the sewing operation is controlled and controlled so that the speed of the sewing machine that is to be achieved at the beginning of the sewing operation is not limited more than is strictly necessary, as a result of which the sewing operation is started. This improves production efficiency.

The initial speed of the sewing machine motor to be achieved at the beginning of the sewing operation, depending on the setting of the means for adjusting the sewing thread sewing operation, is controlled automatically, thereby improving the operability of the sewing machine.

In accordance with the present invention according to claim 6, the needle thread control unit of the sewing machine according to claim 5 further comprises:

means for adjusting the initial speed (controller 38 and control panel 74a) for adjusting the initial speed

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9 9 9 • 9 9999 • 9 · sewing machine motor speed at the start of the sewing operation when performing the needle sewing operation.

It is to be understood that the subject matter of the present invention according to claim 6 provides the same advantages as that achieved by the object of the present invention according to claim 5.

In particular, the means for adjusting the initial speed may provide for adjusting the initial speed of the sewing machine motor to be achieved at the start of the sewing operation if the needle thread catcher does not grasp the needle thread, depending on the fabric sewn or the thickness and type of needle thread.

Thus, if the needle thread catcher does not grasp the needle thread, then the initial speed of the sewing machine need not be reduced to a greater extent than necessary. As a result, the sewing machine motor can be put into operation so that the production efficiency can be increased.

In accordance with the present invention according to claim 7, a needle thread control unit has been developed in a sewing machine 100 having a needle thread catching device 60 that engages the needle thread end passing through the needle at a position below the needle plate 50 at the start of the sewing operation. the needle yarn to a position spaced from the needle vertical travel path and releases the gripped end of the needle yarn after performing a predetermined number of stitches, the control unit comprising:

Memory means (control unit 38 and electrically erasable programmable non-volatile memory 72 EEPROM) for storing a plurality of sewing patterns, means for adjusting the gripping operation (control unit 38 and control panel 74a) for adjusting whether the needle thread gripping operation resulting from operation of the needle thread catching device, whether or not to be performed for each of the plurality of sewing patterns, selection means (control unit 38 and control panel 74a) for selecting the desired sewing pattern from the plurality of sewing patterns stored in the memory means, and a needle thread (control unit 38) for controlling the operation of the needle thread catching device set by adjusting means for adjusting the gripping operation in dependence on the sewing pattern selected.

In accordance with the present invention, according to claim 7, the control means for controlling the operation of the needle thread catching device controls and controls the needle thread catching device adjusted to correspond to the sewing pattern when the sewing operation is performed on the basis of the sewing pattern selected by the selection resources.

As a result, the operation to be performed by the needle thread catching device is switched and the operation to be performed by the needle thread catching device is not switched. It can thus be carried out very much. • • • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ····························································································································

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 partially exposed side view showing a sewing machine provided with a needle thread catcher according to an exemplary embodiment of the present invention;

Fig. 2 is an exploded perspective view showing the needle thread catcher;

Fig. 3 is a perspective view of the needle thread catcher as seen from below;

Fig. 4 is a perspective view of the needle thread catcher as seen from above;

Fig. 5 is a block diagram illustrating a sewing machine control unit;

Fig. 6 is a descriptive view showing an exemplary signal output pattern from the sewing machine main spindle motor;

Fig. 7 is a view for explaining the "initial positions of the members constituting the driving means, the clutch means, the associated operating means, the gripping means and the detecting means according to the exemplary embodiment, Fig. 7A is a plan view, and Fig. 7B is a side elevational view;

Fig. 8 is a plan view for explaining the "gripping positions and" holding positions of the members constituting the drive member, the clutch means, the associated operating means, the gripping means, and the detecting means according to the exemplary embodiment; Fig. 8A is a plan view; elevation view;

Fig. 9 is a view for explaining the "release positions of the members constituting the drive means, the clutch means, the associated operating means, the gripping means, and the detection means according to the exemplary embodiment, Fig. 9A is a plan view;

Fig. 10 is a view for explaining the "standby positions of the members constituting the driving means, the clutch means, the respective operating means, the gripping means, and the detection means according to an exemplary embodiment, wherein:

Fig. 10A shows a plan view, and Fig. 10B shows a side view;

Fig. 11 is a plan view showing a sewing machine control panel;

Fig. 12A shows the pattern data associated with the sewing machine, and Fig. 12B is a descriptive view showing needle manipulation (i.e., stitches) performed on the pattern data;

Fig. 13 is a flow chart illustrating the flow of operations of a sewing machine according to the present invention;

Fig. 14 is a flow chart illustrating the flow of operations of a sewing machine according to the present invention;

Fig. 15 is a flow chart illustrating a memory sensor setting progress that is performed during operation of a sewing machine according to the present invention;

Fig. 16 is a descriptive view showing an exemplary setting pertaining to the memory switch of the sewing machine of the present invention;

FIG. 17 is a flow chart illustrating the flow pattern of the straight pattern to be performed during operation of the sewing machine of the present invention;

Fig. 18 is a flow chart illustrating a sewing operation of a sewing machine according to the present invention;

FIG. 19 is a flow chart illustrating a sewing operation of a sewing machine according to the present invention;

Fig. 20 is a flow chart illustrating a sewing operation of a sewing machine according to the present invention.

Legend to Fig. 5

36 - main spindle motor 36, encoder 38 - control unit 74a - control panel 74b - a foot press switch 74b for pressing the fabric 74c - trigger switch 75b - the driving circuit 75b of the main spindle motor 36 76a - an X-axis feed motor 76a 7 6b the drive circuit 76b of the feed motor 76a in the direction X axis 77a - Y-axis feed motor 77a 77b the drive circuit 77b of the feed motor 77a in the direction Y axis 78a - a needle sewing motor 78a 78b - the drive circuit 78b of the needle catch motor 78a threads 79a - cloth presser foot 79a 7 9b the drive circuit 79b of the presser foot motor 79a fabric 80a - X-axis origin sensor 80a 80b - Y-axis origin encoder 80b

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80c - yarn pickup start sensor 80c

80d - počátku sensor base 80d for pressing the fabric

- digital to analog converter

81a - a needle 81 tensioning magnet 81a

81b - excitation circuit 81b for tensioning the needle thread

Legend to Fig. 6

a) output signal from the main spindle motor (signal that lasts from the start of sewing machine operation when the needle is raised until the next needle is raised)

(b) needle raised position signal

c) the active state once in the raised position of the needle during one revolution of the sewing machine engine

d) angle of rotation signal

e) active state ninety times (every 4 °) during one sewing engine speed f ·) reference signal

(g) active state once at 125 ° per sewing machine engine speed

Legend to Fig. 13

step S100 - is the setting button active? step S101 - memory sensor settings step S102 - are the PI to P4 buttons active?

• · step S103 step S104 step S105 step S106 step S107 step S108 step S109 step S110 step Slil

Key to Step S112 Step S113 Step S114 Step S115 Fig. 14 Setting the Direct Pattern Are the pattern number buttons up to the high voltage buttons active?

displaying data in the display area depending on the buttons, is the LED on for the corresponding buttons illuminated forward (+) or back (-) button active?

Updating the data set on the data display section is the needle sewing button active?

switching off the needle sewing light LED when this light LED is on, or the needle sewing light LED when this light is off, are the P1 to P4 buttons active?

direct pattern selection is setting button active?

search engine start for sewing the needle thread search engine start foot for pressing the fabric press search engine start for feed in X-axis direction and feed start for Y-axis, shift motors to start sewing position • ·

step S116 - lifting the presser foot step S117 is a presser foot switch for pressing the fabric active? step S118 - lowering the presser foot down step S119 - is a presser foot switch for pressing the fabric active? step S120 lifting the presser foot step S121 - Is the trigger switch active? step S122 - sewing operation step S123 displacement of the initial sewing position for the motor X-axis and Y-axis motor, offset the initial position of sewing the needle thread step S124 - lifting the presser foot The legend to FIG. 15 Dec step S300 - memory switch No. 1 step S301 is the forward (+) or reverse (-) button active? step S302 - update the memory switch number step S303 - is the setting button active? step S304 - Display memory switch details corresponding to the memory switch number step S305 - is the forward (+) or reverse (-) button active? step S306 - - update memory details switches step S307 - is the setting button active? step S308 - clogging of the set memory switch

to electrically erasable programmable non-volatile memory 72 EEPROM

Legend to Fig. 16

(a) memory switch details

(b) memory switch number

(c) details

(d) the default value

(e) speed sewing machine e for first stitch achieved on beginning of sewing operation , When has be j ehelní thread caught (f) speed sewing machinery for second stitch achieved on beginning of sewing operation , When has be needle thread caught (g) speed sewing machinery for third stitch achieved on beginning of sewing operation , When has be j ehelní thread caught (h) speed sewing machinery for fourth stitch achieved on beginning of sewing operation , When has be j ehelní thread caught (i) speed sewing machinery for Fifth stitch achieved on beginning of sewing operation , When has be j ehelní thread caught

j) the tension of the needle thread to be achieved at the beginning of the sewing operation when the needle thread is to be caught

(k) the position of the angle of rotation to catch the needle thread

(l) the number of stitches achieved at the time the needle thread is released

m) sewing machine speed for the first stitch reached at the beginning of the sewing operation when the needle thread is not to be caught

n) sewing machine speed for the second stitch reached at the beginning of the sewing operation when the needle thread is not to be caught

o) sewing machine speed for the third stitch reached at the beginning of the sewing operation when the needle thread is not to be caught

p) sewing machine speed for the fourth stitch reached at the beginning of the sewing operation when the needle thread is not to be caught

q) the speed of the sewing machine for the fifth stitch reached at the beginning of the sewing operation when the needle thread is not to be caught.

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r) tension reached at the time of the sewing operation (tension reached at the beginning of the sewing operation when the needle thread is not to be caught)

Legend to Fig. 17

a) direct pattern setting step S400 step S401 step S402 step S403 step S404 step S405 step S406 step S407 step S408

b) return selection of a straight pattern, corresponding to pressing any of buttons P1 to P4, is the pattern number button active for the needle thread tension?

displaying data in the button display area, is the forward (+) or back (-) button active?

Updating the data set on the data display section is the needle sewing button active?

the stitch LED turns off when the stitch LED is on, or the stitch LED lights when the stitch LED is off, is the setting button active?

saving the selected direct pattern in an electrically erasable programmable non-volatile memory 72 EEPROM • 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 · 0 • fc 9 9

Legend to Fig. 18

(a) sewing operations

step S200. the needle-trapping operation should occur threads? step S201 the needle thread output voltage achieved at the beginning of the sewing operation when it should be needle thread caught step S202 output speed of the sewing machine for the first the stitch to be achieved at the beginning the sewing operation if the needle thread is to be captured, transmitted to the excitation circuit spindle motor, output instruction active sewing speed step S203 the needle thread output voltage achieved at the beginning of the sewing operation if it is not to be needle thread caught $ step S204 output speed of the sewing machine for the first the stitch to be achieved at the beginning sewing operation if the needle thread is not to be captured, transmitted to the excitation circuit spindle motor, output instruction active sewing speed * step S205 is the needle lift position signal inactive? step S206 - number of stitches N <- 0 Angle of rotation position <- 75 step S207 - the reference signal is switched from inactive state to active state?

step S208 step S209 step S210 step S211 step S212

Legend to Step S213 Step S214 'Step S215 Step S216 Step S217 Step S218 Step S219 Step S220 Step S221 Number of Stitches N <- Number of Stitches N + l Rotation Angle Position R <- Rotation Angle Position R + l the angle of rotation signal is switched from inactive state to active state? position of rotation angle R <- position of rotation angle R + 1 is the needle thread to be captured?, is the number of stitches N equal to 1?, does the position of rotation angle R correspond to the position of the needle thread?

19, is the number of stitches N corresponding to the number of stitches to release the needle thread?, does the position R of the angle of rotation correspond to the position of the needle thread release? shifting the needle thread engagement to the released position corresponds to the rotational angle position R of the sewing machine speed switch position corresponding to the rotational angle position R of the needle thread switching position? Is the needle sewing operation in progress?

. - is the number of stitches N equal to 1?

output needle thread tension is the number of stitches N equal to 0?

does the position R of the angle of rotation correspond to the start position of the XY feed?

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9999

99, step S222, initiating an XY feed operation for the N th stitch

Legend to Fig. 20 Step S223 Step S224 Step S225 Step S226 Step S227 Step S228 Step S229 Step S230 Are the XY Data End?

output instruction to stop the sewing machine e is the sewing machine at rest?

is the number of N stitches between 1 and 5? Is the needle sewing operation in progress? the sewing output speed achieved for the first to fifth stitches at the start of the sewing operation if the needle thread is to be caught, supplied to the spindle motor driving circuit supplied to the spindle motor driving circuit an output set speed, supplied to the spindle motor driving circuit

DETAILED DESCRIPTION OF THE INVENTION

Exemplary embodiments of the present invention will now be described in more detail below with reference to the accompanying drawings.

When explaining the construction of the respective members of the main body of the sewing machine, including the needle gripping device, The 9 yarns of the present invention are defined such that the X-axis runs in a horizontal direction. in a direction perpendicular to the main spindle (not shown in the illustrations of the sewing machine shown), the Y axis extends along the main spindle of the subject sewing machine, and the Z axis extends in the vertical axis direction.

In particular, it should be emphasized that the left side of the cylindrical bed 31 with respect to the X-axis direction is taken as the positive side, while the right side of the cylindrical bed 31 is taken as the negative side.

The front end side of the cylindrical bed 31 with respect to the Y-axis direction is taken as the positive side, and the rear end side of the cylindrical bed 31 is taken as the negative side.

The upper side of the cylindrical bed 31 with respect to the Z-axis direction is taken as the positive side, the lower side of the cylindrical bed 31 is taken as the negative side.

The sewing machine 100, shown in Figure 1, has a basic sewing machine configuration that creates stitching or chain stitches on the sewn product.

In particular, the sewing machine 100 comprises a cylindrical bed 31 having a substantially planar bed surface 31a, a longitudinal body portion 32 'which is erected upwardly at the rear end of the cylindrical bed 31.

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The arm portion 33 extending forward of the upper portion of the longitudinal body portion 32 substantially parallel to the cylindrical bed 31, a needle bar 35 extending downwardly from the front end portion of the arm portion 33, a needle 52 attached to the lower the end of the needle bar 35;

a rotary hook (not shown in the figures), arranged in the interior of the cylindrical bed 31, the main spindle motor 36 serving as a driving source for the sewing operation, a control panel 74a which is used to enter various data (shown in FIG. 11), and a control unit 38 (shown in FIG. 5) for controlling the entire sewing machine 100.

The fabric feed plate (not shown) is arranged on the bed surface 31a of the cylindrical bed 31. A sewn object (for example, a fabric or fabric) located on the fabric feed plate is supported by the fabric pressing foot (not shown).

The sewn object is fed in a front-to-back or right-to-left direction via the X-axis feed motor 76a and the Y-axis feed motor 77a (see Figure 5), wherein both said motors serve as a feeding mechanism together with the cloth feeding plate. The feed mechanism is controlled and controlled by the control unit 38.

The needle bar 35 is arranged to be movable vertically. By means of the known needle bar movement control mechanism, the needle bar 35 is driven by the main spindle motor 36 via the main spindle, thereby performing a vertical reciprocating movement.

The encoder (shown in FIG. 5) is arranged on the output drive shaft of the main spindle motor 36 or on the main spindle. The encoder is designed to detect the angle of rotation of the main spindle of the main spindle motor 36. For example, each time the main spindle of the main spindle motor 36 rotates 1 degree, a pulse signal is sent to the control unit 38.

Based on one revolution of the main spindle, the needle bar 35 performs one reciprocating movement.

The needle 52 is attached to the needle bar 35. The thread hole (also called the "needle handle") is formed at the lower end of the needle 52. The needle thread supplied from the needle thread supply source passes through the needle thread hole 52.

The rotary hook is positioned immediately below the needle 52. The rotary hook is provided with a blade tip for receiving the needle thread from the lowered needle 52. The rotary hook comprises a spool around which the lower thread is wound. The rotary hook is designed to perform rotary movement and is driven by the main spindle motor 36.

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In particular, the lower shaft (not shown) is connected to the rotary hook, the lower shaft ₍ connected to the gear mechanism. The gear mechanism is connected to the main spindle. Thus, if the main spindle motor 36 is driven, the movement of the main spindle motor 36 is transmitted. the rotary hook through the main spindle, the gear mechanism and the lower shaft, as a result of which the rotary hook performs a rotary movement.

As shown in Figure 1, the needle plate 50 is mounted on the bed surface 31a of the cylindrical bed 31, with needle holes 51 formed in the needle plate 50. The needle 52 is inserted into the cylindrical bed 31 via the needle hole 51.

The rotary hook performs a rotational movement during the period in which the needle 52 performs one vertical reciprocating movement. When the needle 52 has been lowered, the swivel blade tip picks up the needle thread, thereby forming a needle thread loop extending from the stitch to the needle loop 52. As the swivel hook rotates, the needle thread loop is expanded and the needle thread is intertwined with the bottom of threads. By such an interconnected operation between the needle 52 and the twist gripper, the lower thread is intertwined with the needle thread, as a result of which a stitch or chain stitch is formed on the sewn product.

As shown in FIG. 1, the sewing machine 100 is provided with a needle thread guiding mechanism 39 for supplying the needle thread from the needle thread source to the needle 52. The guiding mechanism 39 for guiding the needle thread. The needle thread is provided with thread guiding members 40, 41 and 43, a thread tension spring 42, a thread tension lever 44 and a thread tension adjusting device 45 (a device for applying tension to the needle thread).

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The yarn guide member 40 is attached to the side surface of the arm portion 33 and is located at the rear end of the arm portion 33. A yarn hole 40 is provided in the yarn guide member 40. The needle yarn fed from the needle yarn supply source is bent forward by passing through the yarn hole in the yarn guide member 40.

The yarn guiding member 41 is disposed in front of the yarn guiding member 40 and is secured to the front end portion of the side surface of the arm portion 33. The needle thread supplied from the yarn guiding member 40 passes around the yarn guiding member 41 and is bent inwards.

The yarn tension adjusting device 45 is provided with a needle thread tensioning disc assembly 46 consisting of a stationary needle thread tensioning disc and a movable needle thread tensioning disc, and a solenoid (not shown).

A needle yarn tensioning disk assembly 46 is provided at the apex end of the arm portion 33 at a position below the yarn guide member 41. The needle thread tensioning disc assembly 46 is designed such that the movable needle thread tensioning disc is arranged so as to lie against a stationary needle thread tensioning disc.

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The needle thread fed from the yarn guide member 41 is sandwiched between the movable needle thread tensioning disc and the stationary needle thread tensioning disc of the needle thread tensioning disc assembly 46.

The needle thread tension reel assembly 46 exerts a pressure force on the needle thread by sandwiching the needle thread between the movable needle thread tension disc and the stationary needle thread tension disc. Consequently, tension is applied to the needle thread.

disc for stationary assembly 46

The solenoid, which is disposed on the needle thread tension driver circuit 81b, which will be described in more detail below, applies pressure (i.e., a force that causes the movable needle thread tension to approach the needle thread tension disc) on the tension discs. needle thread.

By means of the solenoid pressure, the thrust force acts on the needle thread from the needle thread tensioning disk assembly 46.

The magnitude of the solenoid pressure, that is the magnitude of the thrust applied to the needle thread from the needle thread tensioning disk assembly 46, is directly proportional to the magnitude of the electrical current flowing into the solenoid. The control unit 38 controls and controls the magnitude of the electrical current passing through the solenoid, thereby controlling and controlling the magnitude of the thrust applied to the needle thread.

For example, a solenoid for the yarn tension adjusting device can be used as a solenoid, the solenoid being a solenoid which is a solenoid. 4 and described in Japanese JP-A-2000-202 183.

published patent application

The solenoid has a specific stroke section, wherein the pressure exerted on the needle thread tensioning disc (i.e., the needle thread tensioning disc assembly) from the needle thread tensioning disc (i.e., the plunger piston) is independent of the stroke of the movable needle tensioning disc. needle thread.

If the electrical current flowing through the solenoid is constant, then the yarn tension (i.e., the resistance or thrust force) acting on the yarn via the yarn tensioning disc remains constant, independently of the yarn thickness. During the stroke section, the yarn tension acting on the yarn by means of the needle thread tensioning disc can then be controlled by controlling the electric current flowing through the solenoid.

The guide member 43 is mounted immediately upstream of the needle thread tensioning disk assembly 46. A thread tension spring 42 is interposed between the thread guide member 43 and the needle thread tension reel assembly 46. The needle thread, extending from the needle thread tensioning disk assembly 46, extends around the thread tensioning spring 42 and extends upwardly, wherein. it is guided by a thread guiding member 43. The needle thread is then bent by means of the thread guide member 43.

If there is no tension or very little tension on the needle thread, the thread tension spring 42 is positioned in the stop position, which is clockwise relative to the needle thread tensioning disk assembly 46 (viewed in the direction of 1). At this point, the connecting line connecting the thread tension spring 42, the thread guide member 43 and the needle thread tension reel assembly 46 is not rectilinear.

The needle thread path leading from the needle thread tensioning disk assembly 46 to the thread guide member 43 is of the greatest length.

As the tension exerted on the needle thread increases, the thread tension spring 42 is positioned counterclockwise relative to the needle thread tension reel assembly 46 (viewed in the direction shown in FIG. 1).

If the tension exerted on the needle thread increases above a predetermined level, then the connecting line connecting the thread tension spring 42, the thread guide member 43 and the needle thread tension reel assembly 46 is straightened. As a result, the needle thread path has the shortest length.

The yarn tensioning lever 44 is located immediately in front of the yarn guide member 43. The thread hole is formed in the thread tension lever 44. The needle thread, guided from the thread guide member 43, passes through the thread hole, is bent downward, and continues to the needle tab 52.

The yarn tensioning lever 44 is arranged to move in a linear vertical reciprocating motion, and is a

Vertically driven by the main spindle motor 36. In particular, a gear mechanism for converting the rotational movement of the main spindle into a vertical reciprocating linear movement of the yarn tensioning lever 44 is interposed between the main spindle and the yarn tensioning lever 44.

Consequently, in operation of the main spindle motor 36, the movement of the main spindle motor 36 is transmitted to the yarn tensioning lever 44 via the main spindle and the transmission mechanism, thereby causing the yarn tensioning lever 44 to move in a linear reciprocating motion in the vertical direction. The cycle during which the yarn tensioning lever 44 moves in a rectilinear reciprocating movement in the vertical direction is identical to the cycle in which the needle bar 35 moves in a linear reciprocating movement in the vertical direction.

However, there is a phase shift between the yarn tensioning lever 44 and the needle bar 35. More specifically, there is a shift between the timing at which the needle bar 35 is located at the top dead center and the timing at which the yarn tensioning lever 44 is located. Also, there is a shift between the timing at which the needle bar 35 is located at the bottom dead center and the timing at which the yarn tensioning lever 44 is located at the bottom dead center.

_t When the lever 4 the thread 4 located at the bottom dead center, as this lever 44 approaches the thread tension, putting the greatest proximity to the guide member 43 for guiding the thread. Consequently, the path of the needle thread running from the thread guide member 43 to the thread tension lever 44 is the shortest.

When the yarn tensioning lever 44 is located at the top dead center, the yarn tensioning lever 44 is separated as far as possible from the yarn guiding member 43. As a result, the path of the needle thread running from the thread guide member 43 to the thread tension lever 44 is the longest.

Through such vertical movement, the yarn tensioning lever 44 then supplies the needle thread from the needle thread supply source to the needle 52, releases the needle thread when the needle thread loop is pulled by the rotary hook, or draws the needle thread expanded after the needle thread is released from the rotary hook. .

As shown in FIG. 1, the needle thread catcher 60 is arranged in the cylindrical bed 31 of the sewing machine 100.

The specific arrangement of the needle thread catching device 60 will now be described.

As shown in Figures 1 to 4, the needle thread catching device 60 comprises a stepper motor A (hereinafter referred to as "the engine"), which serves as a single drive, clutch means B for connecting the stepper motor. And to the respective operating means C, which will be described in more detail later, the respective operating means mechanical operation in synchronization of the means B,

C, which move the gripping means D, which grip the end of the needle thread and release the gripped end of the needle thread, with movement, detecting means E for detecting the needle thread catching device 60 (shown in the figures of FIG. 1; FIG. 7, 8, 9 and 10) for detecting the position of the gripping means D, and a control unit 38 (shown in FIG. 5) for controlling the operation of the needle yarn catching device 60 as a function of the signal emitted by the detection means. means E.

The stepper motor A is the only drive device that serves as a driving source for the needle thread catching device 60. Motor A consists of a known stepper motor, which rotates each time by a predetermined angle in synchronization with the pulse signal output from the control unit 38.

As shown in FIG. 1, the motor A is positioned in the space of the cylindrical bed 31 at a location close to the longitudinal body portion 32 by means of the cylindrical bed 31.

As shown in Figure 2, the clutch means B are provided with a rotatable arm arm. A member 11 (hereinafter referred to as an "arm member") and a connecting member 12. One end of the arm member 11 is secured to the spindle member 10 of the motor A, and a hole 11a is formed in the other end of the arm member 11. If the spindle member 10 of the motor A rotates as a result of driving the motor A, the arm member 11 rotates around the spindle member 10 (see arrow L) shown in the figures of Figures 2 and 4.

As shown in Figures 1 to 4, the connecting member 12 is formed by a long member that extends in the front and rear directions along the substantially longitudinal direction of the cylindrical bed 31.

As shown in the figures of Fig. 2, the opening 12a is formed in the front part of the coupling 12, the opening 12b being formed in the rear part thereof. The aperture 11a in the arm member 11 and the aperture 12b in the coupler 12 are connected to each other in a sliding manner by a stepped bolt 13. Consequently, when the arm member 11 performs a rotary movement (see arrow L shown in Figures 2 and 3). 4), the coupling 12 moves back and forth (see arrow M shown in the figures of FIGS. 2 to 4).

To prevent the coupling 12 from interfering with the not shown feed mechanism provided at the top of the cylindrical bed 31, the coupling 12 is provided with a bent portion 12c for orienting a portion of the coupling 12 that extends from the opening 12a toward the longitudinal body _t portion 32 from the rearward direction to one of the transverse directions of the coupling 12 perpendicular to the direction of vertical movement of the needle 52 (e.g., to the left).

The coupler 12 is also provided with a bent portion 12d to orient the extended portion of the coupler 12 downward from one direction, and another bent portion 12e to re-orient the extended portion from such a lowered position to one of the transverse directions of the coupler 12 (e.g., left) , and yet another bent portion 12f to orient the expanded portion from one direction in the rearward direction.

The link member 12 is further provided with bent portions 12g and 12h to secure the position of the expanded portion of the link member 12 flush with the clutch section disposed between the opening 12b and the arm member 11.

As shown in FIG. 1, the respective operating means C are disposed below the needle plate 50.

As shown in FIG. 2, the respective operating means C comprise as primary members

as plate bed 1 "bed), for capture threads (called in others as bottom plate 2 "Bottom plate) for r capture threads (called in others as top plate 3 "an upper plate), for capture threads (called in others

• • • 4 4

4, the yarn catch plate cover (referred to hereinafter as the &quot; bed cover &quot;), the yarn catch cam link (hereinafter referred to as the &quot; cam plate link &quot;), the coil spring 8, and the roller 9.

A groove 1a having a predetermined width is formed in the center of the plate bed 1 in its longitudinal direction. Further, the opening 1b is formed in the groove 1a so that it extends in the longitudinal direction. The groove 1a has substantially the same width as the bottom plate 2 and the top plate j).

The slot-shaped left opening 1c is formed on the left side of the groove 1a in the plate bed 11 so that it extends in the longitudinal direction, the slot-shaped right opening 1d is formed on the right side of the groove 1a so that it runs in the same direction. The slot-shaped left opening 1c and the slot-shaped right opening 1d are formed substantially parallel to each other.

The left opening 1c and the right opening 1d are arranged relative to each other in such a position that they are slightly offset from each other in the longitudinal direction. The left opening 1c is formed relatively in the forward position, the right opening 1d is formed relatively in the rear position.

The roller 9 is attached to the left edge of the plate bed 11 by a screw 1e.

·· ·· ·· * · ·· 9 se ·

The bottom plate 2 is formed by a long substantially plate-like member. A substantially square hole 2b is formed in the front end section 2a of the bottom plate 2, wherein the slot-shaped opening 2d is formed in the rear end section 2c of the bottom plate 2.

If the opening 2b formed in the front end section 2a. The lower plate 2 is positioned at a position below the needle hole 51 in the needle plate 50 (see FIGS. 1 and 7 to 10), thus opening 2b acts as a through hole through which the needle 52 (see FIG. 7B) passes. Therefore, this opening 2b will hereinafter be referred to as the "through opening 2b."

The lower plate 2 is provided with a left-hand branch member 2f which branches away from the main center portion 2e to a certain extent in the right direction. With respect to the bottom plate 2, the front pin 2g is disposed on the lower surface of the main center portion 2e, the left pin 2h being disposed on the lower surface of the left branch member 2f.

The bottom plate 21 having the above construction is mounted on the bedding so that it fits into the groove 1a in the bedding. In this case, the front pin 2g of the bottom plate 2 is mounted in the front latch section 8a of the coil spring 8 and passes through the opening 1b of the plate bed 1.

The left pin 2h is fastened to the cam plate link 7 in a sliding manner by a stop member 7b, passing through the left hole 1c in the plate bed 1 and the left hole 7a in the cam plate link 7.

·· ··· 9 · · · · · · · · · · · ·

9999 99

9999 98 9

9

9,999 9 9 9 9

9999 9999

9 9 9 9 9 ae 999 99 9

The upper plate 2 3 ^E consists essentially of a plate-shaped member that is somewhat shorter than the lower board 2. The protrusion 3b protruding downward is disposed on the front end portion 3a of the top plate 3 ^. The top plate 3 is provided with a right-hand branch member 3d which turns away from the main center portion 3c to a certain extent to the right.

In relation to the upper plate 2 ^e j back pin 3f is arranged on the lower surface of the rear end portion 3e of the upper plate 3, and the right pivot 3G is disposed on the bottom surface 3d of the right branch member.

The upper plate 3 having the above construction is laid on the lower plate 2 so that it fits into the groove 1a of the plate bed 1. In this case, the rear pin 3f of the upper plate 3 is received in the rear latch section 8b of the coil spring 8, passing through the opening 2d in the bottom plate 2 and the opening 1b in the plate bed 11.

The right pin 3g is attached to the cam plate link 7 in a sliding manner by the stop member 7d while passing through the right opening 1d in the plate bed 11 and the right opening 7c in the link 7.

The lid 4 of the plate bed 1 is formed by a substantially plate-like member. The plate bed cover 4 is secured to the plate bed in two forward positions and two rear positions by means of four screws 4a. As a result, the plate bed cover 4 has a structure such that the bottom plate 2 and the top plate 3 are sandwiched between the plate bed 7 and the plate bed cover 4, thereby preventing the bottom plate 2 and the top plate 3 from wobbling.

The cam plate connecting member 7 is formed by a substantially plate-shaped member which is arranged in a substantially horizontal direction. The left opening 7a is formed in the left end section of the cam plate coupling 7, the right opening 7c is formed in the right end section of the cam plate coupling 7.

As mentioned above, the left pin 2h bottom plate 2 is inserted into the left bore 7a, and the right pivot plate 2 upper 3 g ^te inserted into the right hole 7c.

The cam plate pin 7e is disposed on the bottom surface of the cam plate link member 7. The cam plate pin 7e is mounted in a sliding manner in the annular hole 12a formed in the front end section of the coupling 12. Consequently, when the coupling 12 moves in its longitudinal direction (see arrow M shown in the figures of Figures 2 to 4) by the driving force of the motor A, the longitudinal movement of the coupling 12 can be transmitted to the coupling 14. cam plates.

A detailed description of this function will be given in connection with the explanation of the operation of the needle thread catching device 60, which will be done in the following. In connection with the transmission of the driving force from the motor A to the cam follower 7, the individual members of the respective operating means C perform their functions in synchronization.

The cam section 7f, which is slightly curved to correspond to the outer circumferential surface of the roller 9, is formed on the left edge section of the cam plate link.

• ·

• ·

A detailed description of the cam section 7f will be given in connection with the explanation of the operation of the needle thread catching device 60. The outer peripheral surface of the roller 9 arranged on the left edge of the plate bed 1 comes into contact with the cam section 7f.

The coil spring 8 is formed by a member intended to restrict the longitudinal movement of the lower plate 2 and the upper plate 3.

In particular, as shown in FIG. 3, the front latch section 8a and the rear latch section 8b of the coil spring 8) are respectively attached to the front pin 2g of the lower plate 2 and to the rear pin 3f of the upper plate 2. and the rear pin 3f moves such that they move away from each other in the longitudinal direction, so the coil spring 8 ensures that the front pin 2g and the rear pin 3f approach each other.

The lower plate 2 and the upper plate 2 are forced by the drive force of the coil spring 8 to approach each other in the longitudinal direction. As shown in the drawings, the coil spring 8 is disposed in a position below the cam plate connection member 7 so that it crosses it when viewed in a plane.

As shown in FIG. 2, the gripping means D is formed by a member arranged at the front of the respective operating means C, provided with a guide member 6 for guiding the end of the needle thread inserted into the through hole 2b to a predetermined and further provided with a gripping member 5 for gripping the end of the needle thread inserted into the through hole 2b.

• ·

The guide member 6 is formed by a member having a tapered side wall (i.e., guide wall 6a) whose central portion is recessed inwardly. The guide member is mounted on the front end section 2a of the bottom plate 4, particularly in a position at the front end region relative to the through hole 2b in the bottom plate 2, by means of two screws 6b.

A detailed description of the guide member 6 will be given in connection with the explanation of the operation of the needle thread catching device 60, which will be described later.

When the end of the needle thread passes through the through hole 2b in the lower plate 6, the end of the needle thread is guided towards the guide wall 6a of the guide member 6 in connection with the rearward movement of the lower plate 2. The end of the needle thread is held by being fastened by the front wall 21 of the through hole 2b. In particular, the front wall 21 of the through hole 2b has the function of a holding section for holding the end of the needle thread.

The gripping member 5 is formed by a member that is attached to the front end section 3a of the top plate 2. A circular opening 5b is formed in the rear end section 5a of the gripping member 5. The protrusion 3b of the top plate 2 fits into the circular opening 5b. In this case, the gripping member 5 becomes pivotable, the protrusion 3b forming the center of rotation (see arrow K shown in FIG. 2). In other words, the gripping member ulož is mounted to be pivotable relative to the top plate 3.

A protrusion 5d projecting to a certain extent downwardly is provided on the front end section 5c of the gripping member 5. When the circular opening 5b is attached to the protrusion 3b of the top plate 3, the projection 5d fits into the through hole 2b formed in the front end section 2a of the bottom plate. 2.

The design of the gripping member 5 is such that since the projection 5d is somewhat smaller in width than the through hole 2b in the bottom plate 2, when the gripping member 5 rotates relative to the top plate 3, the right and left ends of the projection 5d collide with the right and left side walls of the through hole 2b in the bottom plate 2, thereby regulating the rotational movement of the gripping member 5. Conversely, the projection 5d of the gripping member 5 is arranged with a slight lateral clearance in the through hole 2b.

When the upper plate 2 has been moved forward relative to the lower plate 2, the gripping member 5 is guided by the guide wall 6a as it rotates around the protrusion 3b of the upper plate 3, thereby moving it forward. Accordingly, the projection 5d of the gripping member 5 comes into contact with the front wall 21 of the through hole 2b. As a result, the end of the needle thread that continues to pass through the through hole 2b can be gripped. In particular, the projection 5d of the gripping member 5 has the function of a gripping section which grips the end of the needle thread.

As mentioned above, the present embodiment has such an arrangement that the guide member 5 is attached to the bottom plate 2 by the use of two screws 6b, whereby the front wall 21 of the through hole 2b and the guide member 6 are integrated so as to form a retaining section. .

• 9 • 9

44 * ··· ·· ·· 99 # Alternatively, it may be also applied such construction when the front part through bore 2b without the use of guide member 6, so that it is guided

wall. In this case, the projection 5d of the gripping member 5 must also be tapered to match the shape of the front of the through hole 2b.

In this embodiment, the through hole 2b into which the end of the needle thread is to be inserted is designed as an opening. However, this part can also be designed as a hook.

As shown in Figures 1 and 7 to 10, the detecting means E of the needle sewing device 60 is provided with a sensor notch plate 20 (hereinafter referred to as "notch plate") by a sensor 21 for sensing. an initial position (hereinafter referred to as an "initial sensor") and a readiness sensor 22 (hereinafter referred to as a "distance sensor").

The sensor score plate 20 is formed by a member that is attached to the coupling 12 and that moves them back and forth together with the coupling 12.

The score plate 20 has a first sensing section 20a, which is used when the initial sensor 21 detects whether or not the gripping means D are located in the initial position (i.e., the position where the gripping means D is positioned most forward, with the following description this applies to any opposing parts), and a second sensing section 20b, which is used when the initial sensor 21 detects whether or not the gripping means D is * *

Placed in the standby position (i.e., in the position where the gripping means D are positioned as far back as possible, and in the following description this also applies to any opposing parts).

The initial sensor 21 comprises a known photo sensor, which is fixed to the sewing machine frame and is provided with a light emitting element and a light receiving element.

(i) If the first sensing section 20a interrupts the light beam 21a of the initial sensor 21 in connection with the movement

notch plates 20 forward or backwards, so initial sensor 21 enters active relationship. (ii) If first scan the section 20a does not interrupt luminous

beam 21a, the initial sensor 21 enters an inactive state.

The initial sensor 21 sends a detection signal to the control unit 38, which indicates whether the initial sensor 21 is active or inactive.

Like the initial sensor 21, the distance sensor 22 is formed by a known photo sensor, which is attached to the sewing machine frame and which has a light emitting element and a light receiving element.

(i) If the second sensing section 20b interrupts the light beam 22a of the distance sensor 22 in connection with the forward or backward movement of the score plate 20, the distance sensor 22 enters an active state.

(ii) If the second sensing section 20b does not interrupt the light beam 22a, the distance sensor 22 enters an inactive state.

The remote sensor 22 sends a detection signal to the control unit 38 to indicate whether the remote sensor 22 is active or inactive.

The detecting means E of the needle thread catching device 60 has the function of the yarn pickup start sensor 80c, which will be described in more detail below.

As shown in FIG. 5, the control unit 38 controls and controls the aforementioned individual members. In performing its role of the voltage-providing control means, the control unit 38 then controls and controls the needle thread tension in the yarn tension adjusting device 45.

In performing its task of detecting means for detecting the angle of the main spindle, the control unit 38 then detects and controls the angle of rotation of the main spindle.

When performing its task of detecting means, the control unit 38 then detects whether or not the set angle of rotation of the main spindle matches or does not correspond to the angle of rotation of the main spindle detected by the detecting means for detecting the angle of rotation of the main spindle.

While performing its role of the needle thread grip control means, the control unit 38 then performs a control operation to ensure that the needle thread gripper grips the needle thread when the detecting means detects that the set angle of rotation of the main spindle matches the detected angle. rotating the main spindle.

₄ In fulfilling its role as the control means of the sewing machine, then the engine control unit 38 controls the driving motor of the sewing machine * depending on the set angle of rotation of the motor of the sewing machine.

When performing its role of the needle-holding control means, the control unit 38 controls the function of the needle-catching device 60.

In particular, as shown in FIG. 5, the control unit 38 comprises as its basic arrangement a non-volatile ROM 70, a direct-access RAM 71, an electrically erasable programmable non-volatile EEPROM 72 and a CPU 73.

In the ROM ROM 70, a sewing program to be used to control and control the sewing machine and data to be used by the sewing program are pre-stored.

»'·

The direct access memory 71 stores data or the like calculated by the CPU 73 based on the data and the sewing program read from the ROM 70.

The electrically erasable programmable non-volatile EEPROM 72 as in the memory means stores data set by the control panel 74a, which will be described in more detail below.

For example, the electronically erasable programmable non-volatile memory 72 of the EEPROM stores pattern data including stitch data, sewing speed data, needle thread tension data, or pattern data directly serving as sewing data, in which the pattern, sewing speed data and needle thread tension data.

The CPU 73 performs various arithmetic processing operations in accordance with the sewing program stored in the ROM 70, using direct access memory 71 as a work area.

The basic processor is connected to the control interface 74 of the unit 73 of the panel 74a Basic

The CPU is mainly through a processing unit

The CPU selects and modifies the sewing data based on the data entered through the control panel 74a.

The CPU processor 73 is connected to the fabric presser foot switch 74b and the trigger switch 74c via the interface 74. ^Upon receiving the instruction signals from the fabric presser foot switch 74b and the trigger switch 74c, the CPU 73 controls and controls mechanisms related to other sewing operations such as the fabric presser foot mechanism, the fabric feed mechanism, the drive mechanism, and the machine. a mechanism for catching the yarn, based on the sewing data, thereby performing the sewing operation.

Via the interface 75, the CPU 73 is connected to the driver circuit 75b

a main spindle motor 36 that drives the main spindle motor 36.

The CPU processing unit 73 controls and controls the operation of the drive mechanism (e.g., the needle bar to which the needle 52 or the main spindle is attached) by controlling and controlling the rotation of the main spindle motor 36. The main spindle motor 36 is provided with an encoder.

In the excitation circuit 75b of the main spindle motor 36, which drives the main spindle motor 36, the signal generated by processing the pulse signal output from the encoder so as to correspond to the main spindle angle of rotation is input to the CPU 73 via the interface 75c. Through this signal, the CPU 73 may monitor the rotation angle of the main spindle.

For example, the signal includes a needle height position signal that becomes active when the needle 52 is positioned in the up position, i.e., in the range of 45 ° to 65 °, provided that the upper dead center of the needle bar 35 is taken as 0 °. an angle of rotation that becomes active ninety times during one revolution of the main spindle, that is, every four degrees, and a reference signal that becomes active when the angle of rotation of the main spindle falls within the range of 125 ° to 140 ° (see Fig. 6).

Signals can also be produced without the use of pulse signal output from the main motor encoder • * · _R · ·· ··.

^k · · · · · · · ¹ ♦ I ·· · »spindle, for example by using an encoder or sensors for detecting the rotational angle of the main spindle.

Through the interface 76, the CPU CPU 73 is coupled to the drive circuit 76b of the X-axis feed motor 76a, which drives the X-axis feed motor 76a arranged in the fabric feed mechanism, thereby controlling and controlling the operation of the fabric feed mechanism in the X-axis direction.

Via the interface 77, the CPU CPU 73 is connected to the drive circuit 77b of the Y-axis feed motor 77a, which drives the Y-axis feed motor 77a arranged in the fabric feed mechanism, thereby being controlled and controlled operation of the yarn feeding mechanism in the Y-axis direction.

Via the interface 78, the CPU CPU 73 is also coupled to the drive circuit 78b of the needle sewing motor 78a, which drives the needle sewing motor 78a (motor A, which is used to move the needle sewing device 60 to the initial position). , to the gripping position, to the holding position, to the release position, and to the standby position via the interface 78, thereby controlling and controlling the

grasping the needle thread.

Through the interface 79, the CPU CPU 73 is also coupled to the drive circuit 79b of the cloth presser motor 79a, which drives the cloth presser motor 79a, which is used to provide movement. feet for pressing the fabric in a vertical direction, whereby the feet for pressing the fabric are controlled and controlled.

Through the interface 80, the CPU CPU 73 is connected to the X-axis origin sensor 80a and the Y-axis origin sensor 80b, which are used to determine the origin (i.e., the initial position of the fabric feed plate) of the fabric feed plate. (not shown in the figures) arranged in the fabric feeding mechanism. Upon receiving a signal indicating whether or not the fabric feed plate is in the initial position, then the CPU 73 executes a control operation based on the signal.

Via the interface 80, the CPU CPU 73 is coupled to the yarn pickup sensor 80c to detect the yarn pickup position 60. Upon receiving a signal indicating whether the gripping means D of the needle thread catching device 60 is or is not in the normal position, then the CPU processing unit 73 performs a control operation based on the signal.

Further, via the interface 80, the CPU CPU 73 is coupled to the fabric presser foot sensor 80d, which is used to detect the position of the fabric presser foot (not shown) arranged in the fabric presser mechanism. Upon receiving a signal indicating that the presser foot has returned to position

Then, the CPU CPU 73 performs a control operation based on this signal.

Via a digital-to-analog converter 81, the CPU CPU 73 is also connected to the needle thread tension driver 81b, which is arranged on the needle thread tension magnet 81a, which is used to control the magnitude of the solenoid current. The CPU base unit 73 is proportional to the amount of current that is set and controlled from 0 to 255 steps, controlling and controlling the voltage of the needle thread tension magnet 81a, thereby controlling and controlling the thread tension adjusting device 45.

Next, the functions of the individual needle thread catching devices 60 that will be performed during sewing of the fabric will now be described.

First of all, the functions of the individual motor forming sections A, the clutch means B, the respective operating means C, the gripping means D and the detecting means E of the needle thread catching device 60, which have performed their functions since the sewing operation only immediately after the start of the sewing operation.

The functions of each member are as follows:

(O1) The arm member 11 performs a rotational movement forward by a predetermined angle by rotating the motor A, the spindle member 10 of the motor A serving as the axis of rotation (see arrow L0, shown in the illustration of FIG. 7A). The connecting member 12, slidably mounted to the arm member 11 by a stepped bolt 13, also moves forward, hereinafter referred to as "forward movement" (see arrow MO shown in Figure 7A).

The entire cam plate link 2, which is connected to the link member 12 by means of a pin, moves forward in relation to the forward movement of the link member 12.

(03) The right pin 3g of the top plate 3, connected to the cam plate link 2 by means of a pin, moves forward along the right opening 1d in the plate bed 2 in accordance with the forward movement of the cam plate link 1, thereby colliding with the front wall of the right opening ld. As a result, the forward movement of the right pin 3g is regulated. In this case, the upper plate 3, integrally formed with the right pin 3g, also moves forward, as a result of which the upper plate 3 is positioned at the front. (04) The left pin 2h of the lower plate 2 connected to the cam plate connector 11 by means of The pivot pin moves forward along the left opening 1c of the plate bed 2 in accordance with the forward movement of the cam plate coupling 2. At this point, the left opening 1c of the plate bed 2 is formed somewhat before the right opening 1d.

As a result, the right pin 3g of the top plate 2 collides with the front wall of the right opening 1d before the left pin 2h of the bottom plate 2 (i.e., in the 03 state). Subsequently, the left pin 2h of the bottom plate 2 moves forward along the left opening 1c of the plate bed 11, using the right pin 3g of the top plate 3 as the axis of rotation.

The forward movement of the left pin 2h, i.e. the forward movement of the lower plate 2, continues until the through hole 2b in the lower plate 2 reaches a predetermined forward position located immediately below the needle hole 51 of the needle plate 50. At this point, the control unit 38 stops the motor A, whereby the lower plate 2 is brought to a standstill.

The left opening 1c of the plate bed 1 is formed so as to have a sufficient forward length with a reasonable edge so that the left pin 2h does not collide with the front wall of the left opening 1c, even if the left pin 2h returns to the forward position. This avoids the loss of synchronization of the motor A, which could otherwise occur if the left pin 2h collides with the front wall of the left opening 1c.

In addition, the undesirable movement of the coupling which could be caused when the motor A is synchronized is regulated, as a result of which the needle thread catching mechanism is protected.

(05) When the bottom plate 2 and the top plate 3 are located in the forward position, the front pin 2g of the bottom plate 2 and the rear pin 3f of the top plate 3 are spaced apart from each other against the driving force of the coil spring EL V in this case, the front pin 2g of the lower plate 2 and the rear pin 3f of the upper plate 3 are driven so that they approach each other in the longitudinal direction by means of the driving force of the coil spring EL

· · · · · · · · · · · · · ««

However, the lower plate 2 can come to a forward position against the driving force of the coil spring 8, since the driving force of the motor A is greater than the driving force of the coil spring 8.

When the bottom plate 2 and the top plate are located in the forward position, the front wall 21 of the through hole 2b in the bottom plate 2 is spaced from the projection 5d of the gripping member 5 attached. to the front end section 3a of the top plate 3 as a result of which the through hole 2 is then opened.

At this point, there is a vertical overlap between the through hole 2b and the needle hole 51 in the needle plate 50 so that the needle 52, which is in the first stitch position after the sewing operation has started, can move vertically, passing through the through hole 2b and the needle hole. 51 in the coal plate 50.

The coupler 12 has moved forward, wherein both the start position sensor 21 and the standby position sensor 22 become inactive.

The positions in which the individual members occupy the conditions described in connection with the designations (01) to (07) are formed by the locations where the gripping means D are located on the path of the vertical movement of the needle 52. In the following description these positions will be referred to for the members concerned.

In connection with the condition (07), then under conditions where at least the initial sensor 21 or the proximity sensor 23 is active, if the respective members are located in the "initial positions", the control unit 38 performs the control

to start or stop driving the sewing machine 100 in connection with the output detection signal from the sensors.

In particular, if the gripping means D are located in a position deviated from the regular "starting position" before the sewing operation commences, or in a similar situation, starting or stopping the drive of the sewing machine may be performed. As a result, the gripping means D can be prevented from interfering with the operation of the needle 52 when performing the first stitch.

When the respective members are positioned in regular "initial positions", the needle 52 for the first stitch, into which needle 52 is inserted the end of the needle thread, moves in the vertical direction through the needle hole 51 and the through hole 12b. Here, the end of the needle thread is retracted downwardly by the hook (not shown) when the needle 52 is lowered. Subsequently, when the needle 52 rises, the end of the needle thread hangs down as it has been inserted into the through hole 2b and the needle hole 51.

Referring now to FIG. 7, the operation of the respective members constituting the motor A, the clutch means B, the corresponding means C, the gripping means D, and the detection means E of the needle thread catching device 60 will now be described. an operation (i.e., after initiating movement of the needle 52 for the first stitch in the vertical direction).

The operation and functions of the respective members will now be described in more detail below.

(Pl) The arm member 11 rotates rearward by a predetermined angle by rotating the motor A, the spindle member 10 of the motor A serving as the axis of rotation (see arrow LI shown in the illustration). 8A). Thereafter, the connecting member 12, attached to the arm member 11 in a sliding manner by the use of a stepped bolt 13, also moves rearwardly, hereinafter referred to as "backward movement" (see arrow M1 shown in Figure 8A).

(P2) The entire cam plate link 2 connected to the link member 12 by means of pins moves backward in relation to the backward movement of the link member 12.

(P3) When the linker T has begun to reverse, the top plate 3 does not initially move rearwardly since the top plate rear pin 3f is pulled forward by the coil spring force so that the right top plate pin 3g collides with the front wall of the right hole 1g. As a result, the upper plate 2 does not move rearwardly at the beginning, with only the lower plate 2 beginning to move rearwardly.

The front pin 2g and the rear pin 3f (see condition 05), which are spaced from one another, are brought closer to each other in connection with the backward movement of the cam plate coupling 7, by the force of the coil spring 2 'attached to the front pin 2g of the bottom plate 2. and the rear pin 3f of the upper plate 3. The lower plate 2 and the upper plate 3, which are integrally formed with the pins 2g and 3f, also move to a certain extent towards the rear.

· • * · * * *

··· * · · · · · · · · ·

As the distance between the top plate 3 and the bottom plate 2 decreases, the top plate 3 and the bottom plate 2 gradually move rearwardly. However, since the amount of back movement of the bottom plate 2 is large, the top plate 3 and the bottom plate 2 converge with each other.

(P4) In connection with the return movement of the upper plate 3, the right pin 3g of the upper plate 2 detaches from the right opening 1g in the plate bed i (see state 03) and moves slightly rearward along the right opening 1d in the plate bed 1. In this in the case of a cam plate coupling to which the right pin 3g of the top plate 2 ^{and the} left pin 2h of the bottom plate 2 are fixed substantially perpendicular to the longitudinal direction. At this point, the upper plate 2 ^{and the} lower plate 2 move substantially the same distance.

(P5) If the bottom plate 2 and the top plate 3 are moved backwards, the amount of movement of the bottom plate 2 is greater than the amount of back movement of the top plate 3 due to the time when the bottom plate 2 and the top plate 2 started to reverse. (see P4). As a result, the guide member attached to the front wall 21 and to the front end section 2a of the through hole 2b of the bottom plate 2 moves backwards so that it approaches the gripping member 5 attached to the front end section 3a of the top plate 3.

In this case, the projection 5d of the gripping member 5 comes into contact with the front wall 21 of the through hole 2b of the bottom plate 2, whereby the through hole 2b is closed. When the through hole 2b is closed, the end of the needle thread inserted into the open through hole 2b is

gripped between the projection 5d and the front wall 21 of the through hole 2b.

When the through hole 2b is closed, the end of the needle thread inserted into the through hole 2b is guided to the center of the front wall 2i while remaining in contact with the guide wall 6a of the guide member 6. Further, the gripping member 5 is mounted on the top plate 3 in a rotatable manner. wherein the gripping member 5d has a slight lateral play in the through holes 2b. The projection 5d comes into contact with the front wall 2i and is slightly deflected relative to the front wall 2i.

The above design eliminates the need to increase the force of the coil spring 8 to force the protrusion 5d into contact with the front wall 21. The end of the needle thread can be gripped very gently and reliably between the projection 5d and the front wall 21i.

In this case, the protrusion 5d of the gripping member 5, which has the function of the gripping section, moves relative to the front wall 2i of the through hole 2b, which has the function of the holding section, thereby gripping the end of the needle thread. Thereby the gripping means D are located in the "gripping position".

(P6) The gripping means D move slightly backwards, the end of the needle thread being gripped between the projection 5d of the gripping member 5 and the front wall 21 of the through hole 2b, while the needle thread gripping device A remains stationary. In this state, a predetermined number of stitches (e.g., several stitches) are made by the needle 52.

(P7) In connection with the return movement of the coupling 12, the first sensing section 20a of the score plate 20 interrupts the light beam 21a of the initial sensor 21, thereby activating the initial sensor 21. In this case, the distance sensor 22 remains inactive.

The position in which the respective members occupy the states described in connection with the states (P1) to (P7) is where the gripping means D are spaced rearwardly from the "initial position" away from the vertical movement path of the needle 52 (see FIG. 7B) toward the longitudinal body portion 32 via a "gripping position" in which the gripping means D grips the end of the needle thread.

Further, the position at which the conditions described in relation to states (P1) to (P7) are reached is where the end of the needle thread gripped by the gripping means D is held on the front wall 2i of the through hole 2b having the function of a holding section. This position will hereinafter be referred to as the &quot; holding position for the respective members.

In connection with states (P6) and (P7), when the respective members are located in the "holding position", the initial sensor 21 is switched from the inactive state to the active state. However, if the gripping means D have been placed in a regular "holding position" and the initial sensor 21 has been activated, the control unit 38 performs the control operation such that the needle 52 carries out a predetermined number of stitches (e.g. several stitches) in relation to the output detection signal. from initial_sensor 21.

As a result, it is possible to prevent the gripping means D from interfering with the needle 52 when performing the second stitch and subsequent stitches.

Referring now to FIG. 9, the functions and operation of the respective members constituting the motor A, the clutch means B, the corresponding means C, the gripping means D, and the detecting means E of the needle thread catching device 60 having the functions be carried out after the end of the needle thread has been gripped.

The operation and functions of each member are as follows:

(Q1) The arm member 11 rotates rearward by a predetermined angle, wherein the spindle member 10 of the motor A serves as the axis of rotation by rotating the motor A (see arrow L2 shown in Figure 9A). Further, the coupling 12 attached to the arm member 11 in a sliding manner by the use of a stepped screw 13 also moves rearwardly (see arrow M2 shown in Figure 9A).

(Q2) The entire cam plate link 14 connected to the pin coupling 12 moves backward in relation to the back movement of the cam member 12. If the cam movement link size 11 exceeds a predetermined amount of back movement, the cam follower 12 is cam-like. the cam plate connecting portion 7f comes into contact with the outer peripheral surface of the roller 9.

·· ····

(Q3) In connection with the return movement of the cam plate link 2, the left pin 2h of the bottom plate 2 ^{and the} right pin 3g of the upper plate 2 also move slightly rearward along the left orifice 1c and the right orifice 1d, both ^of which belong to the plate bed. in this case, both the left pin 2h of the lower plate 2 and the right pin 3g of the upper plate 2 move rearwardly. The lower plate 2 and the upper plate 3, which are integrally formed with the pins 2h and 3g, also move to a certain extent towards the rear.

If the amount of back movement of the cam follower 2 exceeds a predetermined amount of back movement, the cam section 7f of the cam follower T comes into contact with the outer peripheral surface of the roller 9 (see condition Q2). Right pin 3g. upper plate 2 ^is moved rearward, the touch portion serves as a rotation fulcrum. In this case, due to the fact that the cam section 7f comes into contact with the roller 2 ^e 3, the return movement of the left pin 2h of the bottom plate 2 is slightly restricted.

As a result, the retraction amount of the right pin 3g becomes larger than the retraction amount of the left pin 2h. Therefore, in connection with the amount of back movement of the top plate 2 ^{and the} bottom plate 2, which are integrally formed with the right pin 3g and the left pin 2h, the amount of back motion of the top plate 2 becomes larger than the amount of back motion of the bottom plate 2.

(Q4) When the bottom plate 2 and the top plate 3 move rearwardly, the tab 5d of the gripping member 2 'attached to the front end section 3a of the top plate 2 (see condition P5) also moves rearwardly away from the front wall 2i, since the amount of back movement of the top plate 3 is greater than the amount of movement of the bottom plate 2 (see condition Q3). As a result, the through hole 2b opens slightly.

The bottom plate 2 and the upper plate 2 ^is moved rearward, the through hole 2b passes from the closed state into a slightly opened state. In this case, the end of the needle thread held between the projection 5d of the gripping member 5 and the front wall 21 of the through hole 2b (see condition P5 and condition P6) is released.

(Q5) Although the score plate 20 moves backward in connection with the backward movement of the coupling member 12, the score plate 20 does not move rearward to such an extent that the second sensing section 20b interrupts the light beam 22a of the distance sensor 22. Consequently, in this case, the initial sensor 21 remains active, while the distance sensor 22 remains inactive.

The positions in which the respective members assume the states described in relation to the states (Q1) to (Q5) are formed at places where the gripping means D are spaced rearwardly from the "holding position in the direction away from the vertical movement path of the needle 52 (see FIG. 5B) toward the longitudinal body portion 32.

The position in which the conditions described in relation to states (Q1) to (Q5) are reached is where the projection 5d of the gripping member 5 having the gripping function moves relative to the front wall 21 of the through hole 2b having the holding function the end of the needle thread is released. This position will hereinafter be referred to as the &quot; relaxed position for the respective members.

Referring now to FIG. 10, the functions and operation of the respective members comprising motor A, clutch means B, respective operating means C, gripping means D, and detection means E of the needle thread catching device 60 will now be described. and operation will be performed after the needle thread end has been released.

The functions and operation of each member are as follows:

(R1) The arm member 11 rotates rearwardly at a predetermined angle, wherein the spindle member 10 of the motor A serves as the axis of rotation by rotating the motor A (see arrow L3 shown in Figure 10A). Further, the coupling member 12, attached to the arm member 11 in a sliding manner by using a stepped bolt 13, also moves rearward (see arrow M3 shown in Figure 10A).

(R2) The entire cam plate link 7 connected to the pin coupling 12 moves further rearward in connection with the backward movement of the link member 12. In this case, the cam plate link member 7 moves rearwardly while the cam portion 7f of the link The cam plate remains in contact with the outer peripheral surface of the roller.

(R3) In connection with the further return movement of the cam plate link member 7, the left bottom plate pin 2h and the right top plate pin 2g also move rearwardly along the left opening 1c and the right opening 1d, both belonging to the plate bed 11. . In this case, both the left pin 2h of the bottom plate 2) and the right pin 3g of the top plate 2 move rearwardly. The lower plate 2 and the upper plate, which are integrally formed with the pins 2h and 3g, also move further rearwardly.

When the left pin 2h and the right pin 3g are moved rearwardly, the cam section 7f of the cam plate linking member 7 comes into contact with the roller 9. In addition, the right opening 1d in the plate bed 11 is formed to a certain extent rearwardly from the left opening 1c. the plate bed jL. As a result, the right pin 3g of the top plate 2 moves rearwardly so that the contact point between the cam section 11 and the roller 9 serves as the center of rotation.

As a result of the above, the amount of back movement of the right pin 3g becomes larger than the amount of back movement of the left pin 2h. In this case, the cam plate connector 7 connected to both the left pin 2h and the right pin 3g becomes slightly inclined with respect to the lateral direction.

The left pin 2h rests on the rear wall of the left opening 1c in the plate bed 1, whereby the return movement of the left pin 2h is regulated. The return movement of the right pin 3g is stopped due to the control unit 38 (not shown) stopping the motor A in a predetermined return position.

Here, the right opening 1d in the plate bed 1 is designed to take sufficient back length with a reasonable edge so that the right pin 3g does not collide with the rear wall of the right opening 1d even if the right pin 3g reaches the rear position.

As a result, the loss of synchronization of the motor A is prevented, which could otherwise occur if the right pin 3g has collided with the rear wall of the right hole 1d.

In addition, the undesirable movement of the coupling 12, which could occur in the event of loss of synchronization of the motor A, is regulated, as a result of which the mechanism of the needle thread catcher is protected. In this case, the lower plate 2 and the upper plate 3, which are integrally formed with the left pin 2h and the right pin 3g, are located completely in the rear position.

(R4) When the bottom plate 2 and the top plate 2 are located in the fully rearward position, the front pin 2g of the bottom plate 2 and the rear pin 3f of the top plate 3 are spaced apart from each other against the force of the coil spring S1. In this case, the front pin 2g of the bottom plate 2 and the rear pin 3f of the rear plate 3 are influenced so that they approach each other in the longitudinal direction by the force of the coil spring 8.

However, the upper plate 2 may remain fully in the rearward position for applying the force of the coil spring 8, since the driving force of the motor A is greater than the force of the coil spring 8.

(R5) When the bottom plate 2 and the top plate 3 are positioned completely in the rearward position, the front wall 21 of the through hole 2b in the bottom plate 2 is spaced from the projection 5d of the gripping member 5 attached to the front end section 3a of the top plate 3. as a result, the through hole 2b passes from the slightly open state (see state Q4) to the fully open state.

(R6) In connection with the further return movement of the coupling member 12, the second sensing section 20b of the scoreboard 20 interrupts the light beam 22a of the distance sensor 22, thereby rendering the distance sensor 22 active. In this case, both the initial sensor 21 and the proximity sensor 22 are activated.

The positions in which the respective members occupy the states described in connection with the states (R1) to (R6) are where the gripping means D are spaced rearwardly from the &quot; holding position in the direction away from the vertical movement path of the needle 52 &quot; ) toward the longitudinal body portion 32.

Further, the position is where the gripping means D moves away from the vertical movement path of the needle 52 (see FIG. 7B) to the fully rearward position. This position will hereinafter be referred to as the "ready position for the members concerned.

The stand-by position is set at a location that provides sufficient distance to separate the end of the needle thread held by the holding section (front wall 2i) from the hook travel path (more specifically, the hook tip end). Thus, if the gripping means D is moved from the &quot; release position &quot; to the standby position, the end of the needle thread sewn into the fabric with the hook, when the gripping means D is stationary in the &quot; .

When the gripping means D is moved from the "open position" to the "standby" position, the open end of the needle thread is distant from the hook movement path, thereby preventing the needle thread from coming out of the fabric. The fabric has been sewn into the fabric through the through hole 2b again.

If the "standby position" is established at a point farther from the vertical movement path of the needle 52 than the above-described location, and if the end of the needle thread has passed through the through hole 2b, the thread may be sewn into the stitch to be formed as follows.

As mentioned above, when the respective members of the needle-catching device 60 leave the &quot; starting position and reach the &quot; standby position by &quot; gripping position, &quot; holding position and &quot; release position, the desired number of stitches is formed. one cycle of sewing operation.

The set items of the control unit 38 will now be described with reference to the control panel 74a of the sewing machine 100 of the present invention.

Here, together with the control unit 38, the control panel 74a has the function of adjusting means.

For example, if it serves as a voltage setting means, the control panel 74a adjusts the voltage required to commence the sewing operation.

Further, if it serves as a means for adjusting the gripping operation, the control panel 74a sets whether or not the needle thread catching device 60 will perform the operation to grip the needle thread.

· »4 4 4 4 4 4 4 4 4 4 4 4

-. · ··· ______ • 9 9 • · 4 •·· 4 9

9 9

9 9 9

9 ........ 9 9 999

9 9

9

When serving as adjusting means for adjusting the angle of the main spindle, the control panel 74a adjusts the angle of rotation of the main spindle if the needle thread catching device 60 is to hold the needle thread.

When serving as adjusting means for adjusting the start speed, the control panel 74a adjusts the start speed of the sewing motor at the start of the sewing operation, depending on whether the needle thread catching device 60 is in operation.

Further, if it serves as selection means, the control panel 74a selects the desired suture pattern.

The control panel 74a shown in Figure 11 includes:

data display section 74d, set button 74e, reset button 74f, incremental forward button 74g, subtract back button 74h, pattern number button 74i, button 74j to increase or decrease the X ratio, button 74k to increase or decrease the Y ratio, ·

speed button 741, 4m needle thread tension button 7, needle thread grip button 74n,

direct button 74o (Pl, P2, P3 and P4), and and LEDs 90, 91 and 92 (ICE), showing operational button state. A place where it is illuminated diode 91 LED lit, various related figures with buttons, numerical data and likewise, they are shown in section 74d for displaying data.

The incremental forward button 74g and the incremental return button 74h are used to change various numerals and numbers, wherein the incremental forward button 74g is for a progressively increasing sequence, while the incremental return button 74h is for an inverse sequence.

The pattern number button 74i is used to recall the pattern number that selects the sewing pattern when the sewing is performed using, for example, a predetermined and pre-stored sewing pattern.

The sewing pattern will now be described.

The sewing pattern is a needle manipulation pattern used in sewing. In order to execute the manipulation pattern • · · ·····

data are available regarding the magnitude of movement of the web feed mechanism in the X direction as well as data regarding the magnitude of movement of the web feed mechanism in the Y direction (i.e., the position of the needle).

Figure 12 shows the actual pattern data as well as the needle manipulation pattern data, the bracket pattern being used, for example, at the time of stitch reinforcement at the end of the sewing operation. When the needle is actuated in accordance with the pattern data shown in FIG. 12A from the starting point (0.0), the needle is actuated in the manner shown in FIG. 12B, as a result, stitches are formed.

The X ratio increase or decrease button 74 and the Y ratio increase or decrease button 74k are used to display the increase or decrease ratio of the sewing pattern when the pattern is formed.

The speed button 741 is used here to display the speed of the sewing machine during the sewing operation.

The needle thread tension button 74m is used to display the needle thread tension during the sewing operation.

The needle thread grip button 74n is used to determine whether or not the needle thread gripping should be performed.

The direct button 74o (P1, P2, P3 and P4) is used to select the data (direct sample data) to be used in performing a custom sewing operation, consisting of a combination of sewing pattern, zoom ratio, sewing machine speed, the needle thread tension, and determining whether or not the needle thread retention is to be performed.

The operation of the sewing machine 100 of the present invention will now be described in more detail below with reference to the flowcharts shown in Figures 13 and 14.

If the setting button 74e is first activated simultaneously with the sewing machine main power - (not shown), that is, if YES is selected in step S100, the process proceeds to step S101 where a memory button is set, which will be described in more detail below.

Conversely, if NO is selected in step S100 or after data relating to the memory sensor is set to be performed in step S101, the process proceeds to step S102.

If the direct pushbutton 74o (P1, P2, P3 and P4) is activated at the same time as the sewing machine main power (not shown) is activated, i.e. if it is selected (YES) in step S102, then the process proceeds to step S103 where it is set straight pattern, which will be described in more detail below.

Conversely, if NO is selected in step S102 or after the direct pattern data has been set to be performed in step S103, the process proceeds to step S104.

In step S104, the operation of the pattern number button 74, the ratio ratio 74j to increase or decrease, the ratio increase button 74k, the speed button 741, and the needle thread tension button 74m are further monitored.

If any of these buttons have been activated, that is, if YES is selected, then the process proceeds to step S105. The settings are shown in the data display section 74d in accordance with the button activated in step S104, whereby the respective LED illuminates.

If NO is selected in step S104 or after the process belonging to step S105 is performed, the process proceeds to step S106.

In step S106, the activation of the add-on forward button 74g and the read-back button 74h are monitored. If either the add forward button 74g or the add back button 74h has been activated, that is, if YES was selected in step S106, then the process proceeds to step S107 where the settings shown in the data display section 74d are updated.

Ί4

If NO was selected in step S106, or if the settings were updated in step S107, then the process proceeds to step S108.

In step S108, the activation of the needle sewing button 74n is monitored. If this button has been activated, i.e. if YES was selected in step S108, the process proceeds to step S109 where the update is performed so that if the needle thread LED is illuminated, the LED 92 will be off, or when the LED 92 is off, the LED 92 is on. ...... ......

If the LED 92 is on, the needle threading attachment is selected. The adjustments are made so that the needle sewing button 74n alternates between the active and inactive states each time the button is actuated.

If NO is selected in step S108, or if the setting has been updated in step S109, the process proceeds to step S110.

In step S110, control of the direct push button 74o (P1, P2, P3 and P4) is monitored. If the direct button 74o has been activated, i.e. if YES was selected in step S110, then the process proceeds to step S111.

The straight pattern for which the direct button 74o has been activated is selected, and the setting of the straight pattern is utilized, in particular the pattern number, the enlargement / reduction ratio X, the y speed and the yarn tension ratio.

Zoom in or out

If NO was selected at step S110, or after performing a pattern selection operation belonging to step S111, the process continues to step S112.

In step S112, control of the adjusting button 74e is monitored.

If the setting button 74e is not operated, that is, if NO is selected in step S112, the process returns to step S104. .......

When the setting button 74e is operated, that is, if YES is selected at step S112, a return to the origin for driving the needle sewing motor 78a (motor A) is performed at step S113 to move the coupling 12 into the the detection position of the yarn pickup sensor 80c.

Here, it is assumed that the origin position is identical to the standby position of the needle thread.

Next, at step S114, the cloth pressing shoe motor 79a is driven, thereby performing a return operation to the origin to move the cloth pressing shoe motor 79a to the detection position of the cloth pressing shoe sensor 8 from the beginning of the cloth pressing shoe.

Here, it is assumed that the origin position coincides with the lowered position of the presser foot.

• · · ·

Further, at step S115, the X-axis feed motor 76a and the Y-axis feed motor 77a are driven, thereby performing an origin retrieval operation to move the motors 76a and 77a to the detection position of the X-axis origin sensor 80a. The yarn feed plate is then moved to the selected sewing start position according to the pattern data. Thereafter, in step S116, the cloth pressing shoe motor 79a is driven, thereby providing a lift of the cloth pressing shoe.

In step S117, the commissioning of the fabric presser shoe switch 74b is monitored. When the switch is actuated, i.e. YES is selected at step S117, at step S118, the cloth presser motor 79a is driven, thereby lowering the presser foot.

In step S119, the commissioning of the shoe switch 74b is again monitored for pressing the fabric. When the switch is actuated, i.e. YES is selected at step S119, at step S120 the fabric pressing shoe motor 79a is driven, thereby raising the fabric pressing shoe upward. The process then returns to step S117.

At step S119, the commissioning of the fabric presser shoe switch 74b is monitored. If the fabric presser foot switch 74b is not operated, that is, NO is selected at step S119, then the process proceeds to step S121.

·· ··· · • · · ····

In step S121, the commissioning of the trigger switch 74c is monitored. If the trigger switch 74c is operated, that is, YES is selected at step S121, then the process proceeds to step S122 where the sewing operation is performed.

Conversely, in step S121, the commissioning of the trigger switch 74c is monitored. If the trigger switch 74c is not operated, that is, NO is selected in step S121, then the process returns to step S119.

In step. S122 is. a sewing operation is performed, which will be described in more detail below. Upon completion of the process, the process then proceeds to step S123 where the X-axis feed motor 76a and the Y-axis feed motor 77a are driven so that they move from the sewing end position to the sewing start position. Further, the needle sewing motor 78a is moved to the start position (standby position).

Further, in step S124, the cloth pressing shoe motor 79a is driven, thereby ensuring that the cloth pressing shoe is lifted up. The process returns to step S117 where the sewing operation is repeated.

The memory switch settings and operations based on these settings will now be described.

As shown in FIG. 16, the default values are set in the memory switch beforehand. If the setting is not changed, the sewing machine is driven in accordance with the standard setting values.

For example, the voltage applied to the device 45 for setting the yarn tension than the upper device 60 for catching the needle thread catches the needle thread is preset to 200 (memory switch. 6), which is higher than the voltage .10 ₄ (memory switch No. 14) required during the sewing operation, performed after the needle thread catching device 60 releases the needle thread.

The CPU base unit 73 reads the setting at the start of the sewing operation, as a result of which the yarn tension adjusting device 45 is controlled. As a result, a suitable tension may be applied to the needle yarn before and after the needle yarn catching device 60 catches the needle yarn.

Although the yarn tension adjusting device 45 controls and regulates the tension on the needle thread in accordance with the setting, i.e., the execution or non-execution of the needle thread gripping operation, the CPU CPU 73 reads the set value 200 (memory switch # 6). or 10 (memory switch No. 14), corresponding to the tension according to the setting, that is, to perform or not to perform the needle thread gripping operation, whereby the yarn tension adjusting device 45 is controlled.

When the needle thread gripping operation is performed, a tension (200) higher than the tension (10) that is applied if the needle thread gripping operation is not performed can be applied to the needle thread.

Even if the starting speed of the sewing motor (motor A) used at the beginning of the sewing operation is · · · · · · · · · · · ·

9 9 ·· controlled and controlled in accordance with the setting, that is to say, whether or not the needle sewing operation is performed, and so that the needle sewing operation is to be performed, the engine speed for the first stitch is set to 1,500 rpm (memory switch no. 1), wherein the engine speed for the second stitch is set at 2700 rpm (memory switch # 2).

Rotation speeds are set to be higher than 400 rpm (memory switch # 9) for the first stitch, and 900 rpm (memory switch # 10) for the second stitch, both values are used when the needle thread gripping operation is not performed.

Depending on whether or not the needle thread gripping operation is to be performed, then the CPU 73 reads the settings, thereby controlling and controlling the starting speed of the sewing machine engine (motor A).

If the sewing thread sewing operation is to be performed, the sewing machine motor can be started at an initial speed that is higher than the speed applied when the sewing thread sewing operation is not performed. Thus, the sewing machine can be lowered at an opening speed that is adapted to the needle thread gripping operation.

When the needle thread catching device 60 grasps the needle thread, the rotation angle 60 of the sewing machine main spindle (i.e. the rotational angle position R) is set to the memory switch No. 7, the number of stitches to be performed than the device 60 for. the sewing of the needle thread releases the needle c c c c c fi <5 e e

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The thread is set to the memory switch No. 8. The CPU 73 deduces the setting, and thus determines the timing in which the thread-catching device 60 has a threading device. grasp and release needle needle.

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Referring now to the flowchart shown in FIG. 15, the process of setting the memory switches belonging to step S101 will now be described.

In step S300, memory switch # 1 is first selected, memory switch # 1 being displayed on data display section 74d on control panel 74a. ·

Next, in step S301, the triggering of the add forward button 74g and the readback button 74h are monitored. If both buttons are activated, that is, if YES is selected in step S301, then the memory switch number is updated in step S302. The memory switch number thus updated is displayed in the data display section 74d.

After step S302, or if NO is selected in step S301, the process continues to step S303.

In step S303, control of the adjusting button 74e is monitored

If the setting button 74e is not operated, that is, if NO is selected in step S303, then the process returns to 'Step S301'. '

• β ·· ···

The set data of the memory switch is stored in an electrically erasable programmable non-volatile memory 72 of the EEPROM, and the process subsequently returns to step S301.

Details of the memory switch data include, for example, sewing machine speed, needle thread tension, and needle thread grip position. Exemplary memory switch data is shown in FIG. 16.

Next, the flow of the straight pattern setting operation belonging to step S103 will be described with reference to the flowchart shown in FIG. 17.

In step S400, the straight pattern corresponding to the direct button 74o (P1, P2, P3, and P4), pressed when power is started, is taken as the adjustment object.

At step S401, the start-up of the pattern number button 74i, the X ratio increase or decrease button 74j, the Y ratio increase or decrease button 74k, the speed button 741, and the yarn tension button 74m are monitored.

If any of these operation buttons, i.e., YES is selected, proceed to step S402, where the setting of the data display section 74d is in accordance with the step depressed at step S401, resulting in the respective LED.

brought into so the process shown on with the button lights up • · · · · · *. . * „· · · · · · · ·

99 9 9

If the setting button 74e is operated, that is, if YES is selected in step S303, then the process proceeds to step S304 where the memory switch data set on the respective memory switch corresponding to the memory switch number is displayed on the display section 74d data. Subsequently, the process proceeds to step S305.

Next, in step S303, the commissioning of the add-on forward button 74g and the read-back button 74h are monitored.

When both buttons are put into operation, that is, if YES is selected in step S305, the memory switch data displayed on the data display section 74d is updated in step S306, the memory switch data so updated is displayed on the section 74d for displaying data.

After performing step S306, or if NO is selected in step S305, the process proceeds to step S307.

In step S307, the adjustment button 74e is monitored.

commissioning

If the setting button 74d is not operated, that is, if NO is selected in step S307, the process returns to step S305.

If the setting button 74e is operated, that is, if YES is selected in step S307, then the process proceeds to step S308.

If NO is selected in step S401, or after performing a process belonging to step S402, the process proceeds to step S403.

In step S403, the commissioning of the add-on forward button 74g and the read-back button 74h are monitored.

If at least one of these buttons is put into operation, that is, if YES is selected in step S403, then the process proceeds to step S404 where the setting shown in the data display section 74d is updated.

If NO is selected in step S403, or after updating the settings in step S404, then the process proceeds to step S405.

In step S405, the start-up of the needle sewing button 74n is monitored.

If the needle sewing button 74n is operated, that is, if YES is selected, then the process proceeds to step S406, where the update is performed so that when the needle sewing LED 92 is lit, the light is on. 92 LED off, or so that when the LED 92 is off, the LED 92 is on.

When the LED 92 is lit, the needle thread gripping is selected.

If NO is selected in step S405, or after making the settings in step S406, then the process proceeds to step S407.

• · · · · · ·

β ··· ·· · »· · · · ·« «

In step S407, the commissioning of the adjustment button 74e is monitored.

If the set button 74e is not activated, that is, if NO is selected in step S407, then the process returns to step S401.

If the setting button 74e is activated, that is, if YES is selected in step S407, then the process proceeds to step S408.

The direct pattern set data is stored in an electrically erasable programmable non-volatile EEPROM 72, and the process returns to step S104.

The flow of the sewing process in the sewing operation belonging to step S122 will now be described, using the flow diagrams shown in Figures 18, 19 and 20.

Performing or not performing the needle thread grip operation, the set needle thread tension and the set speed shown in the flowcharts correspond to the values entered on the set through the control panel 74a, or the values stored and set as a straight pattern.

The illustration of FIG. 16 shows an exemplary setting of a memory switch.

In step S200, an adjustment is made to perform or not to execute the needle thread gripping operation, which in turn is determined.

··

• ····

9 is set by the needle thread grip button 74n or by the straight button 74o (P1, P2, P3 and P4).

If the needle thread grip operation is to be performed, that is, if YES is selected, then the process proceeds to step S201. The output is the needle thread tension set in the memory switch No. 6, which is used when the needle thread is to be captured.

Further, at step S202, the first stitch sewing speed achieved at the beginning of the sewing operation, if the sewing thread sewing is to be performed in accordance with memory switch No. 1, is output to the sewing machine speed instruction circuit (i.e., the motor driving circuit 75b). 36 of the main spindle), thereby rotating the sewing machine and starting the sewing machine.

If the needle thread is not captured, that is, if NO is selected, the process proceeds to step S203 where the output of the needle thread voltage set at memory switch No. 14 is to be reached at the beginning of the sewing operation where the needle thread should not be caught.

Subsequently, in step S204, the sewing machine speed for the first stitch, which is set at the memory switch No. 9, to be reached at the beginning of the sewing operation when the needle thread is not to be seized is the output for the sewing machine speed instruction circuit circuit 75b of the main spindle motor 36 as a result of which the sewing machine rotation instructions are activated and the sewing machine is put into operation.

··

When the sewing machine is started, in step S205, the sewing machine waits until the needle lift position signal is activated. If the needle lift position signal is not active, that is, if the needle has moved from the lifted position to the lowered position, then in step S206 the number of stitches N is set to 0, with the rotational angle position R set to 75, which is the R position angle of rotation achieved at 65 °.

In step S207, the sewing machine reference signal is monitored. If the signal has been changed from an inactive state to an active state, the process proceeds to step S208.

The number of stitches N is updated by an increment of +1, wherein the rotational angle position R is set to 0. If NO is selected in step S207 or if the setting has been updated in step S208, the process continues to step S209.

In step S209, the sewing machine rotation angle signal is monitored. If the signal has changed from an inactive state to an active state, then the process proceeds to step S210, where the angle of rotation position R is updated by increment +1.

If NO is selected in step S209, or if the setting has been updated in step S210, the process proceeds to step S211. The rotational angle position R is the angle of rotation in which one revolution of the main spindle is divided into uniform intervals ranging from 0 to 90.

In step S211, if the needle thread is to be captured, if the number of stitches is one, and if the rotational angle position R corresponds to the needle thread rotational position belonging to the memory switch 7, the process proceeds to step S212 where the needle thread grip is shifted from the beginning position to the gripping position, whereby the needle thread is gripped.

If the needle thread is to be captured in step S213, the number of stitches corresponds to the number of open stitches N of the needle thread belonging to the memory switch No. 8, wherein the rotational angle position R corresponds to a predetermined sewing machine speed switching position (e.g. R = 77). stored in the ROM 70, the process continues to step S214.

The grip of the needle thread is moved to the released position where the needle thread is released.

In step S215, where the rotational angle position R corresponds to a predetermined sewing machine speed change position (e.g., R = 83) pre-stored in the ROM 70, the process continues to step S223.

In step S223, if the pattern XY data indicates an end, that is, YES is set, then the process proceeds to step S224 where the output is an instruction to stop the rotation of the sewing machine.

In step S225, the needle comes to a rest in the upper position of the needle and the sewing operation is completed.

If at step S223, the pattern data XY does not indicate an end, i.e. if NO is set, then the process proceeds to step S226.

• · · · · · · · · · · · · · · · · · · · · · · 9 · ·

9 9 9 9 9

9999 99 99 999 99

If the number of stitches N performed since the start of the sewing operation is in the range of 1 to 5, i.e. if YES is set, then the process continues to step S227.

In step S227, it is determined whether or not the needle thread is to be caught.

If the needle thread is to be captured, i.e. if YES is set, then the process proceeds to step S228.

The speed of the sewing machine which is reached at the beginning of the sewing operation when the needle thread is to be seized, i.e. from the first to the fifth stitch, belonging to the memory switch No. 1 to No. 5, is the output for the sewing machine speed instruction ( means for the driving circuit 75b of the main spindle motor 36.

If the needle thread is not to be captured, i.e. if NO is set, then the process proceeds to step S229.

The sewing machine speed that is reached at the start of the sewing operation if the needle thread is not to be seized, i.e. from the first to the fifth stitch, belonging to the memory switch No. 9 to No. 13, is the output for the sewing machine speed is the drive circuit 75b of the main spindle motor 36.

In step S226, if the number of stitches N is other than 1 to 5, i.e. if NO is set, i.e. after the sewing operation has started and after the fifth stitch has been performed, then at step 230 the speed set by the speed button 741 or the direct button The 74o (P1, P2, P3, and P4) is the output for the instructional.

the sewing machine speed circuit (which is the drive circuit 75b of the main spindle motor 36).

If the processes belonging to steps S228, S229 and S230 are completed, the process proceeds to step S216.

In step S216, if the rotational angle position R is a predetermined needle thread switching position (e.g., R = 77) pre-stored in ROM 70, i.e. YES is selected, the process proceeds to step S217.

As with the process belonging to step S200, a check is made whether or not the needle thread is to be caught.

If the needle thread is to be captured, that is, if YES is selected, then the process proceeds to step S218. If the number of stitches N is set to one, the set needle stitch voltage is the output in step S219.

If the needle thread is not to be captured, i.e. if NO is selected, the process proceeds to step S220. If the number of stitches N is set to 0, then the process proceeds to step S219.

After completion of the process belonging to step S219, if the rotational angle position R is determined such that it is not to be a predetermined position in step S216, i.e. if NO is selected, or if the predetermined number of stitches N is not reached in step S218 or step S220, so the process proceeds to step S221.

· Z · Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z

In step S221, if the rotational angle position R is a predetermined XY feed start position (e.g., R = 36) pre-stored in ROM 70, the process proceeds to step S222.

The X-axis feed motor 76a and the Y-axis feed motor 77a are driven by values that are set to the X-direction and Y-direction feed rates of the N-stitch pattern data determined by multiplying the set the X enlargement or reduction ratio and the Y enlargement or reduction ratio set. The process returns to step S207.

As mentioned above, in the sewing machine 100 of the present invention, the length of the thread remaining on the back of the fabric at the beginning of the sewing operation can be made stable by controlling the operation to be performed by the needle thread catching device 60 by the adjusting device 45. thread tension and sewing machine speed.

Thus, twisting the yarn on the back of the fabric or twisting the yarn in the needle yarn catching device 60 can be prevented. Thus, a stable sewing machine start operation can be performed.

In the present embodiment, the needle thread catching device 60 is driven by the motor A. However, the present invention is not limited to such an embodiment. For example, the needle sewing device may be configured to utilize an air cylinder or magnet, as described, for example, in Japanese Patent Specification. JP 2 671 478 and JP-A-2000-325 683, the Japanese patent application no.

The needle thread tension control can be provided by a two-stage needle thread switching which is provided with two separate yarn tension adjusting devices, operating only at the time of the needle thread catching operation.

In this case, the conventional sewing operation is performed when the needle thread operation is not performed. When the needle thread catching operation is to be performed, the separate needle thread tension adjusting device is driven, thereby increasing the needle thread tension.

It may also be the case that the selection of the needle sewing operation is not stored directly in the pattern data.

Alternatively, the rotation angle signal having 90 parts need not be used to determine the position of the needle. For example, a sensor may be attached to the sewing machine, which is activated each time at the control timing, and the position of the sensor may be adjusted.

Any drive apparatus may also be used as long as they meet the required conditions. Moreover, of course, the specific detailed design of the drive devices can be modified accordingly if desired.

In an exemplary embodiment of the present invention, the adjustment of the memory sensor is performed in a variable manner. However, it will be understood that all or any of the settings or their settings will be fully understood. The parts can be stationary so that they perform similar control operations.

The present invention has the following advantages.

In accordance with the present invention according to claim 1, the yarn tension generating device is controlled and controlled by the yarn tension controlling means such that the tension reached at the beginning of the sewing operation than the yarn retaining device grips the needle thread is greater than the tension achieved during the sewing operation after the needle thread catcher releases the needle thread.

As a result, excessive feeding of the needle thread before the needle thread catching device grasps the needle thread is suppressed, while the length of the needle thread remaining on the back of the fabric at the beginning of the sewing operation can be kept consistent.

As a result, the needle thread on the back of the fabric is reduced or the needle thread is not entangled on the needle holding device so that a stable operation is possible at the beginning of the sewing operation. This has the advantage of improving the quality of the sewn product.

It is to be understood that the subject matter of the invention according to claim 2 provides the same advantage as that achieved by the subject matter of the invention according to claim 1.

*

In particular, the voltage adjusting means adjusts the voltage to be achieved at the beginning of the sewing operation, in particular at the beginning of the sewing operation. »V a než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než než As a result, a suitable tension is set, which is adjusted in accordance with the friction that occurs between the fabric and the needle thread, or to increase the amount of needle thread that varies depending on the fabric to be sewn or the type of needle thread.

It is to be understood that the subject of the invention according to claim 3 achieves the same advantage as that achieved by the subject of the invention according to claim 1 or 2.

In particular, the means for adjusting the gripping operation performs the adjusting operation depending on whether or not the needle-threading device performs the needle-gripping operation.

It is possible to switch between performing the needle thread gripping operation which is performed by the needle thread gripping device, or by not performing the needle thread gripping operation.

The sewing machine may be operated based on the needle thread tension, which is adjusted to match whether or not the needle thread gripping operation should be performed.

Thus, when the sewing machine is started, or when the sewing operation is initiated, the needle thread tension reached at the beginning of the sewing operation is controlled and controlled so that the needle thread does not slip out of the needle, thereby increasing operability and productivity.

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

3 33 9 3 9 0%

In accordance with the subject matter of the invention according to claim 4, the timing at which the needle thread catching device is to grip the needle thread is set and controlled by the angle of the main spindle of the sewing machine. The adjustment of the length of the thread remaining after grasping the needle thread (i.e. the length of the needle thread remaining on the back of the fabric) can be varied. The needle thread can be gripped under optimal conditions depending on the fabric material or the type of needle thread.

According to the subject matter of the invention according to claim 5, if the needle thread catcher does not grasp the needle thread, the sewing machine engine control means controls and controls the initial speed of the sewing machine engine to be reached at the beginning of the sewing operation, so as to be lower than the speed achieved after adjusting the sewing operation of the needle thread, thereby preventing the needle thread from slipping out of the needle handle.

If the needle sewing device can grasp the needle thread, thereby preventing the needle thread from slipping out of the needle loop, the initial speed of the sewing machine to be reached at the start of the sewing operation is controlled and controlled such that the speed of the sewing machine that is to be achieved at the beginning of the sewing operation is not more limited than necessary, so that the sewing operation is started. As a result, improvements in production efficiency can be achieved.

The initial speed of the sewing machine motor to be reached at the beginning of the sewing operation, depending on the setting of the means for adjusting the needle sewing operation, is * 9 9 9

9 9 9 9 9

9

9 9

9S

controlled and controlled automatically, which improves the operability of the sewing machine.

It is to be understood that the subject matter of the invention according to claim 6 provides the same advantages as those achieved by the subject matter of the invention according to claim 5.

In particular, the initial speed adjusting means may provide for adjusting the initial speed of the sewing machine motor to be achieved at the beginning of the sewing operation if the needle thread gripping device does not grasp the needle thread, depending on the fabric to be sewn or the thickness and type needle thread.

If the needle thread gripping device does not grasp the needle thread, the initial speed of the sewing machine need not be reduced to a greater extent than necessary. As a result, the sewing machine motor can be put into operation so that an increase in production efficiency is achieved.

In accordance with the present invention, according to claim 7, the control means for controlling the needle sewing operation control and control the operation of the needle sewing device, which is adjusted to correspond to the sewing pattern when the sewing operation is performed on the basis of the sewing pattern selected by the selection means.

Thus, the operation to be performed by the needle sewing device, as well as the non-operation of the needle sewing device, can be switched with each other. As a result, it can be very

9 9

9999 98 • 9

9 stable operations at the beginning of the sewing operation, so that operability and productivity are increased.

γϋ tM-4 · '9 9 99' 99 9 9

9 9 9 9 9 9 9/9

99 9 · · ββ 9 9 9 9

9-9 9 9 9 9 9 9 9 99 9 9

Claims (4)

A needle thread control unit in a sewing machine having a needle thread tension applying device that applies tension to the needle thread and can vary the tension, and a needle thread catching device that grasps the end of the needle thread passing through the needle in a position below the needle plate at the beginning of the sewing operation, moves the gripped end of the needle thread to a position remote from the needle travel path and releases the gripped end of the needle thread after performing a predetermined number of stitches, the control unit comprising: tension control means that preset the tension to be achieved at the beginning of the sewing operation before gripping the needle thread by the needle thread catching device such that it is greater than the tension to be achieved during the sewing operation after the needle thread is released by the catching device needle thread. The needle thread control unit of the sewing machine of claim 1, further comprising means for adjusting the tension to be achieved at the start of the sewing operation before gripping the needle thread by the needle thread catching device, wherein the tension control means controls the device. for applying tension to the needle thread based on the tension set by the voltage adjusting means. 9 9 0 9 9 0 9 9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9 9 9 99 99 9 9 99 90 9 99 The needle thread control unit of a sewing machine according to claim 1 or 2, further comprising: means for adjusting the gripping operation to adjust whether or not the sewing operation of the needle thread resulting from the activation of the needle gripping device is to be performed, and when the execution of the needle gripping operation is set, the gripping operation adjusting means is adjusted such that the thread is higher than the tension to be achieved at the time of the sewing operation, and the tension control means controls the needle thread tension device such that the tension of the needle thread is higher than the tension to be achieved at the time of the sewing operation, if performing the sewing thread sewing operation, and so that the needle thread tension reached at the beginning of the sewing operation, Yippee the same as the tension, which to be achieved during sewing operation if the implementation grip operation j ehelní threads not set. 4. Needle control unit threads in the sewing machine, having a needle sewing device that engages the needle thread end passing through the needle at a position below the needle plate at the beginning of the sewing operation, moves the attached needle thread end to a position distant from the needle vertical travel path and releases the gripped needle thread end after predetermined the number of stitches, the control unit comprising: • · · · · · · · · · · · · · · · · · · · · · · · 9 9 · · · 9 9 · 9 ***** ***** * 9 * · 5β-5 9 9 9 9 99 »99 ί» means for adjusting the angle of the main spindle for adjusting the angle of rotation of the main spindle, if the needle thread catcher is to grasp the needle thread, means for detecting the angle of the main spindle means for detecting whether or not the main spindle angle of rotation detected by the main spindle angle detection means is or does not coincide with the main spindle angle of rotation set by the main spindle angle adjustment means; and. ... .......-. ... needle thread gripping control means for performing the needle thread gripping operation to be performed by the needle thread gripping device when the detecting means determines that there is agreement between the pivoting angles of the main spindle. 5. A needle thread control unit in a sewing machine having a needle thread catcher that engages the needle thread end passing through the needle at a position below the needle board at the beginning of the sewing operation, moves the attached needle thread end to a position remote from the needle vertical travel path. and releases the grasped end of the needle thread after performing a predetermined number of stitches, the control unit comprising: means for adjusting the gripping operation to ensure adjustment as a function of whether or not the needle thread gripping operation resulting from the activation of the needle thread catching device has been performed, and 100 ALIGN! 4 4 4 4 • 4 '4' 4 · 4 « 4 4 «.99 9 9 9 9 9 9.- 999 9 »4» 44 4 ► 9 9 · 4 44 444 sewing machine motor control means that preset the initial speed of the sewing machine motor to be reached at the beginning of the sewing operation, unless the means for adjusting the sewing operation have set the needle thread gripping operation to be lower than the speed to be sewn is achieved at the time of the sewing operation of the needle thread. The needle thread control unit of a sewing machine according to claim 5, further comprising:. ......... means for adjusting the initial speed for adjusting the initial speed of the sewing machine motor at the beginning of the sewing operation when performing the sewing operation of the needle thread. A needle thread control unit in a sewing machine having a needle thread catching device that engages the needle thread end passing through the needle at a position below the needle board at the start of the sewing operation, moves the attached needle thread end to a position distant from the needle vertical travel path. and releasing the grasped end of the needle thread after performing a predetermined number of stitches, the control unit comprising: memory means for storing the patterns, in the memory of a plurality of sewing means, for adjusting the gripping operation to adjust whether the gripping operation of the needle thread resulting from 101 • • • 4 • 444 • 4 • 44 • 4 4 • 4 4 • 4 4 4 4 4444 • 44 4 4 ·. from the operation of the needle sewing device, whether or not to be performed for each of the plurality of sewing patterns, the selection means for selecting the desired sewing pattern from the plurality of sewing patterns stored in the memory means, and control means of the needle sewing operation needle threads adjusted by adjusting means for adjusting the gripping operation in dependence on the sewing pattern selected.