CN101845714B - Keyhole sewing machine - Google Patents

Abstract

The invention provides a keyhole sewing machine, which comprises a cutting knife sensor and a sewing parameter calculating part. The cutting knife sensor detects the position of a cutting knife for forming a buttonhole. One part of a plurality of sewing parameters needed for forming a keyhole stitch seam is calculated by the sewing parameter calculating part. When an operator replaces the cutting knife, the part of the sewing parameters is not deeded to be set. the accurate sewing parameters are calculated according to the detecting result of the cutting knife position by the sewing parameter calculating part. The keyhole sewing machine can accurately form the keyhole stitch seam by using the calculated sewing parameters. The operator is not needed to perform the test running on the keyhole sewing machine and correct the sewing program according to the test running result. The operator can immediately begin to sew with less labour.

Description

Button holing sewing machine

Technical field

The present invention relates to a kind of button holing sewing machine that forms keyhole stitch seam at processing cloth.

Background technology

Button holing sewing machine carries out eyelet around being formed on the buttonhole on the processing cloth.Button holing sewing machine comprises cutting knife and eedle.Cutting knife is by dropping to processing cloth and should processing cloth and cut off to form buttonhole.Eedle rises, descends, so that the form of carrying out deburring around the buttonhole is formed keyhole stitch seam.

The button holing sewing machine of Japanese Laid-Open Patent Publication 2002-102562 number record comprises the control device of carrying out the keyhole seam according to sewing parameter.Sewing parameter is the shape and size of keyhole stitch seam, the cutting knife size of formation buttonhole etc., is set by the operator.Control device generates stitch data with sewing parameter.Control device comes the feeding section of controlled working cloth, drive division and the cutter driving section of eedle according to the stitch data that generates.The cutting knife of button holing sewing machine can be changed.The operator sets sewing parameter when changing cutting knife, and carries out test running before beginning to make.Test running is for confirming the button holing sewing machine regular event, not having the moving part interference of mechanical structure and the running of poor stitching quality.Test running is implemented by driven at low speed Sewing machines in the situation of not laying processing cloth.When changing cutting knife, the operator implements to expend more labour and time in sewing parameter setting and test running.

Summary of the invention

The object of the present invention is to provide a kind of button holing sewing machine that does not need more labour and time when changing cutting knife.

The button holing sewing machine of technical scheme 1 comprises: cut off processing cloth and form the cutting knife of buttonhole and the cutting knife supporting member that this cutting knife is installed in mounting or dismounting freely, by moving according to sewing parameter, form keyhole stitch seam around the buttonhole that above-mentioned cutting knife forms, above-mentioned button holing sewing machine comprises: the cutter sensor that the position of above-mentioned cutting knife is detected and the sewing parameter calculating part that the part of above-mentioned sewing parameter is calculated according to the position of the detected above-mentioned cutting knife of this cutter sensor.

The button holing sewing machine of technical scheme 1 comprises cutter sensor and sewing parameter calculating part.When having changed cutting knife, cutter sensor detects the position of the cutting knife of changing.The sewing parameter calculating part calculates a part that forms the required a plurality of sewing parameters of keyhole stitch seam with the detected cutter location of cutter sensor.The operator needn't set the sewing parameter that is calculated by the sewing parameter calculating part.The operator need to not set at sewing parameter when changing cutting knife and expend more labour and time.The sewing parameter that the sewing parameter calculating part calculates is the exact value that the testing result according to cutter location calculates.Therefore, change the operator of cutting knife after changing cutting knife, can in the situation of not carrying out test running, begin to make.

In the button holing sewing machine of technical scheme 2, above-mentioned sewing parameter calculating part comprises: the correction value calculating part that calculates the correction value that the size calculating part and calculate to be used for of the length dimension of above-mentioned cutting knife revises the error of the length direction installation site of above-mentioned cutting knife.

As sewing parameter, the sewing parameter calculating part calculates the length dimension of cutting knife and the correction value that the error of the length direction installation site of cutting knife is revised.Button holing sewing machine moves according to the sewing parameter that calculates, and can form buttonhole at the assigned position of processing cloth by this, and form exactly keyhole stitch seam around formed buttonhole.

In the button holing sewing machine of technical scheme 3, above-mentioned cutter sensor detects length direction leading section position and the rearward end position of above-mentioned cutting knife.

Cutter sensor detects length direction leading section position and the rearward end position of cutting knife.The length dimension of cutting knife, the sewing parameters such as error in mounting position of cutting knife can calculate easily and exactly according to the testing result of cutter sensor.

In the button holing sewing machine of technical scheme 4, above-mentioned cutter sensor is installed on can be along the installation component of the length direction Relative Displacement of this cutting knife with respect to above-mentioned cutting knife.

Cutter sensor is by making installation component detect front position and the back-end location of cutting knife with respect to the cutting knife Relative Displacement.Cutter sensor for example can be installed on the pay-off of processing cloth.Pay-off for the feeding of processing cloth along the length direction Relative Displacement of cutting knife.

Description of drawings

Fig. 1 is the stereogram of the button holing sewing machine of first embodiment of the invention.

Fig. 2 partly amplifies the side view of expression with eedle and cutting knife.

Fig. 3 is the stereogram of feed mechanism.

Fig. 4 is the stereogram of the driving mechanism of eedle.

The figure of the action of cloth feeding mechanism when Fig. 5 A～Fig. 5 C is the detection of explanation cutter sensor.

The figure of the action of cloth feeding mechanism when Fig. 6 A～Fig. 6 C is the detection of explanation cutter sensor.

Fig. 7 is the block diagram of the button holing sewing machine control system of the first embodiment.

Fig. 8 is the key diagram of sewing parameter.

Fig. 9 is that expression is according to the flow chart of the movement content of the control device of sewing parameter calculation procedure.

Figure 10 is the chart of the concrete example of expression cutting knife length and front and back correction value.

Figure 11 observes the stereogram that the included buttonhole of the button holing sewing machine of the second embodiment forms mechanism from the top.

Figure 12 is the stereogram that forms mechanism from the included buttonhole of the button holing sewing machine of beneath the second embodiment.

Figure 13 A, Figure 13 B are the key diagrams of the above-below direction shift action of the included cutting knife of the button holing sewing machine of the second embodiment.

Figure 14 A, Figure 14 B are the key diagrams of the fore-and-aft direction shift action of the included cutting knife of the button holing sewing machine of the second embodiment.

Figure 15 is the block diagram of the button holing sewing machine control system of the second embodiment.

Figure 16 is the flow chart that the sewing parameter of the control device of expression the second embodiment calculates movement content.

Figure 17 is the flow chart that the sewing parameter of the control device of expression the second embodiment calculates the variation of action.

Figure 18 is the flow chart that the sewing parameter of the control device of expression the second embodiment calculates the variation of action.

The specific embodiment

Accompanying drawing below with reference to the expression preferred forms describes the present invention in detail.

Button holing sewing machine forms keyhole stitch seam 60 (with reference to Fig. 8), and at the keyhole stitch seam 60 inboard buttonholes 65 that form.Below explanation in, the definition of direction use among Fig. 1, Fig. 3 etc. with arrow represent forward and backward and left and right.

As shown in Figure 1, button holing sewing machine M comprises operation platen 1, motor of sewing machine 2, foot pedal 3, guidance panel 4 and control device 5.Motor of sewing machine 2 is fixed in operation platen 1 central lower.Foot pedal 3 is disposed at operation platen 1 below.Control device 5 is arranged in the containing case of operation platen 1 lower right side.It is anterior that guidance panel 4 is arranged at above-mentioned containing case.

Operator's operating operation panel 4 is set sewing parameter.The operator drives, stops motor of sewing machine 2 by operation foot pedal 3.

Button holing sewing machine M comprises base 6, column 7 and horn 8.Base 6 is fixed in operation platen 1 central upper.Column 7 the base rear portion be arranged to towards above erect.Horn 8 extends towards the place ahead from column 7 upper ends with the form relative with base 6.

As shown in Figure 2, button holing sewing machine M shank 31 in the medial support of horn 8 leading sections.Eedle 32 is installed on shank 31 lower ends of extending towards horn 8 belows.Shank 31 and eedle 32 rise, descend by the action that is arranged on the needle bar drive device (not shown) in the horn 8.Shank 31 and eedle 32 move motor 36 (with reference to Fig. 7) by the driving shank and move back and forth along left and right directions.Shank 31 and eedle 32 rise, descend in the mobile terminal of left and right directions.Needle bar drive device is done by the action that drives into of motor of sewing machine 2.

As shown in Figure 4, button holing sewing machine M comprises two line guiding elements 33a, 33b, thread clamping mechanism 34 and thread take-up tension levers 35.Line guiding elements 33a is installed on horn 8 tops.Line guiding elements 33b is installed on horn 8 right sides in line guiding elements 33a the place ahead.

Thread clamping mechanism 34 has the first tension disk 40, the second tension disk 41 and auxiliary tension disk 42.The first tension disk 40, auxiliary tension disk 42 and the second tension disk 41 on above-below direction alignment arrangements in horn 8 right sides in line guiding elements 33b the place ahead.Thread take-up tension lever 35 has the leading section outstanding towards horn 8 right sides.The action of the thread take-up tension lever driving mechanism (not shown) of the leading section of thread take-up tension lever 35 by being arranged on horn 8 inside is risen, is descended.The thread take-up tension lever driving mechanism synchronously moves with needle bar drive device by the driving of motor of sewing machine 2.

As shown in Figure 4, upper thread 33 passes line guiding elements 33a, 33b, and volume is hung on the first tension disk 40, auxiliary tension disk 42 and the second tension disk 41 successively.The upper thread 33 that volume is hung on thread clamping mechanism 34 passes the line hole of thread take-up tension lever 35 front ends after being hooked on the seton device 33c.Pass the upper thread 33 of thread take-up tension lever 35 behind the guiding elements 33d, the 33e that pass below being disposed at, pass the pinprick of eedle 32 front ends.

34 pairs of volumes of thread clamping mechanism are hung on the upper thread 33 of the first tension disk 40, the second tension disk 41 and auxiliary tension disk 42 and give tension force.The 1st tension disk 40 is removed the tension force of giving upper thread 33 by the action of loose ends solenoid 45 (with reference to Fig. 7).The tension force that thread clamping mechanism 34 is given upper thread 33 diminishes during 45 actions of loose ends solenoid.The tension force of upper thread 33 can switch in two stages by the driving of loose ends solenoid 45.

Thread take-up tension lever 35 loosens upper thread 33 when descending.Eedle 32 descends between upper thread 33 relaxation periods and thrusts processing cloth.Upper thread 33 interweaves with bottom line in base 6 inside.Upper thread 33 is tightened by the rising of thread take-up tension lever 35, forms keyhole stitch seam 60 (with reference to Fig. 8) at processing cloth.

As shown in Figure 2, buttonhole forms device 50 and is arranged at eedle 32 rear sides.Buttonhole forms device 50 and comprises cutting knife 51, supporting member 52 and cutter bar 53.Cutter bar 53 is supported in horn 8 leading sections, and is disposed at shank 31 rear sides.Supporting member 52 is fixed in cutter bar 53 lower ends of extending towards horn 8 belows.Cutter bar 53 and cutting knife 51 descend by the action of cutter driving solenoid 81 (with reference to Fig. 7).

As shown in Figure 3, feed mechanism 10 is arranged at base 6 inner and base 6 tops.Feed mechanism 10 comprises delivery sheet 11, presser feet 12 and feeding motor 13.Delivery sheet 11 is rectangular slabs long on fore-and-aft direction.Delivery sheet 11 is entrenched between the guided plate 14,14 that is fixed in base 6 upper surfaces.Delivery sheet 11 back support are in the brace table 15 of base 6 inside.

Brace table 15 left parts are connected with connecting rod 16 leading sections that extend along fore-and-aft direction.Connecting rod 16 rearward end are connected with travelling carriage 17.Connecting rod 16 utilizes the bearing 19,19 that is arranged on brace table 15 the place aheads and travelling carriage 17 rears to support to and can move along fore-and-aft direction.Base 6 comprises the guide rod 20 that extends abreast with this connecting rod 16 on connecting rod 16 right sides.Guide rod 20 passes travelling carriage 17 right parts.Guide rod 20 is along fore-and-aft direction guiding travelling carriage 17.Travelling carriage 17 is by guide rod 20 and bearing 19,19 guiding and move along fore-and-aft direction.By the movement of travelling carriage 17, brace table 15 is keeping the connection interval of connecting rod 16 to move along fore-and-aft direction.

Feeding motor 13 is disposed at brace table 15 and travelling carriage 17 left sides of base 6 inside.Feeding motor 13 drives driving pulley 13a rotation.Feed mechanism 10 comprises that volume hangs over the driving belt 21 between driving pulley 13a and the driven pulley (not shown).Driven pulley leaves configuration at the rear of driving pulley 13a.Travelling carriage 17 is fixed between driving pulley 13a and driven pulley and drives belt 21 tops.Drive the rotation of the driving pulley 13a that belt 21 drives along with feeding motor 13 and rotate.By driving the rotation of belt 21, brace table 15 and travelling carriage 17 move along fore-and-aft direction.

Supporting member 17 comprises the support portion 17a outstanding towards base 6 tops.Support portion 17a supports to pressure handle 18 rearward end can swing centered by the axle of left and right directions.Pressure handle 18 extends towards the place ahead above base 6.Presser feet 12 is installed on pressure handle 18 leading sections.Move towards the below by the effect of spring force (not shown) pressure handle 18 front portions.Such as Fig. 2, shown in Figure 3, presser feet 12 is overlapped in delivery sheet 11 upper surfaces, presses processing cloth (not shown).As shown in Figure 2, presser feet 12 forward lapping in delivery sheet 11 at eedle 32.

By the movement of brace table 15 and travelling carriage 17, delivery sheet 11 and presser feet 12 are synchronously mobile along fore-and-aft direction.By the movement of delivery sheet 11 and presser feet 12, processing cloth carries out feeding at base 6 upper surfaces along fore-and-aft direction and moves.As shown in Figure 3, delivery sheet 11 comprises the pin hole 11a that the eedle 32 of decline passes.Pin hole 11a is slotted hole long on the moving direction of delivery sheet 11 (fore-and-aft direction).

Feeding motor 13 and presser feet motor 22 are stepper motors.The feeding amount of movement of processing cloth can be regulated by the driving of control feeding motor 13.Presser feet 12 ascending amounts can be regulated by the driving of control presser feet motor 22.Feeding motor 13 comprises the feeding position sensor 101 (with reference to Fig. 7) of the position of rotation that detects this feeding motor 13.Presser feet motor 22 comprises the presser feet position sensor 102 (with reference to Fig. 7) of the position of rotation that detects this presser feet motor 22.Feeding position sensor 101 and presser feet position sensor 102 are the known sensors such as rotary encoder, optical pickocff.

Feeding position sensor 101 and presser feet position sensor 102 output to control device 5 (with reference to Fig. 7) with detection signal separately.Control device 5 compares position of rotation and the benchmark position of rotation of feeding position sensor 101 detected feeding motors 13, calculates by this fore-and-aft direction shift position of delivery sheet 11 and presser feet 12.The benchmark position of rotation is the position of rotation of feed mechanism 10 feeding motor 13 when being positioned at origin position.The origin position of feed mechanism 10 is the last location in the fore-and-aft direction moving range of delivery sheet 11 and presser feet 12.

Control device 5 compares position of rotation and the benchmark position of rotation of presser feet position sensor 102 detected presser feet motors 22, calculates by this above-below direction position of presser feet 12.The benchmark position of rotation is the position of rotation of presser feet 12 presser feet motor 22 when being positioned at origin position.The origin position of presser feet 12 is the uppermost positions in the above-below direction moving range of presser feet 12.

Such as Fig. 2, shown in Figure 3, button holing sewing machine M comprises cutter sensor 105.Cutter sensor 105 is installed on pressure handle 18 (being equivalent to installation component).Cutter sensor 105 is the reflection type optical sensors that have in the central the light projection unit, have light receiver at this light projection unit periphery.Cutter sensor 105 synchronously moves along fore-and-aft direction with presser feet 12 and delivery sheet 11.Cutter sensor 105 can be along cutting knife length direction Relative Displacement with respect to cutting knife 51.

When the cutting knife 51 of buttonhole formation device 50 descends the processing cloth on the delivery sheet 11 is cut off, form buttonhole 65 (with reference to Fig. 8).Buttonhole 65 is holes long on fore-and-aft direction.Cutting knife 51 can be installed on supporting member 52 with installing and removing.The length of buttonhole 65 can change by changing cutting knife 51.

Fig. 5 A～Fig. 5 C represents to install the state of chopped cutter 51.Fig. 6 A～Fig. 6 C represents to install the state of long cutting knife 51.Cutter sensor 105 moves towards the place ahead from the position (origin position) shown in Fig. 5 A, Fig. 6 A.Cutter sensor 105 passes through cutting knife 51 left sides during from position movement shown in Fig. 5 B, Fig. 6 B to position shown in Fig. 5 C, Fig. 6 C.The light projection unit of cutter sensor 105 is towards the right-hand flashlights such as luminous ray or infrared ray that send.The light receiver of cutter sensor 105 be received in Fig. 5 B～Fig. 5 C and Fig. 6 B～Fig. 6 C during knock cutting knife 51 and the reflection flashlight, and output light receiving signal.

The output signal of cutter sensor 105 (light receiving signal of light receiver) input control device 5 (with reference to Fig. 7).Cutter sensor 105 positions (shift position of delivery sheet 11 and presser feet 12) was as the back-end location of cutting knife 51 when control device 5 began the light receiving signal input.Control device 5 during with the light receiving signal end of input cutter sensor 105 positions as the front position of cutting knife 51.

Control device 5 calculates the fore-and-aft direction length (cutting knife length S is with reference to Fig. 8) of cutting knife 51 according to the difference of the back-end location of cutting knife 51 and front position.Control device 5 calculates front and back correction value Δ Y according to back-end location and the front position of cutting knife 51.Front and back correction value Δ Y describes in the back.

Cutter sensor 105 is not limited to reflection type optical sensor, also can be the transmission-type optical pickocff.Cutter sensor 105 also can be the sensor beyond the optical pickocffs such as mechanical sensor, ultrasonic sensor.Installation component is not limited to pressure handle 18, for example also can be presser feet 12.

As shown in Figure 7, control device 5 is the computers that CPU5a, ROM5b, RAM5c, nonvolatile memory 5g, input interface 5d and output interface 5e are connected with bus 5f.

Input interface 5d and above-mentioned feeding position sensor 101, presser feet position sensor 102, cutter sensor 105 are connected with guidance panel and are connected.Input interface 5d gives CPU5a with the position of rotation of feeding position sensor 101 detected feeding motors 13 and the position of rotation of presser feet position sensor 102 detected presser feet motors 22.Input interface 5d gives CPU5a with the output signal of cutter sensor 105 with at the sewing parameter that guidance panel 4 sets.

CPU5a calculates the operating position (the fore-and-aft direction shift position of delivery sheet 11 and presser feet 12) of feed mechanism 10 with the position of rotation of feeding motor 13.CPU5a calculates the above-below direction shift position of presser feet 12 with the position of rotation of presser feet motor 22.CPU5a uses the output signal of cutter sensor 105 and the operating position of feed mechanism 10, calculates cutting knife 51 sizes and Y-direction correction value by step described later.

The benchmark position of rotation (origin position of feed mechanism 10) of nonvolatile memory 5g storage feeding motor 13 and the benchmark position of rotation (origin position of presser feet 12) of presser feet motor 22.CPU5a will be stored in the benchmark position of rotation of the feeding motor 13 in the nonvolatile memory 5g for the operating position that calculates feed mechanism 10.CPU5a will be stored in the benchmark position of rotation of the presser feet motor 22 in the nonvolatile memory 5g for the above-below direction shift position of calculating presser feet 12.

Input interface 5d is connected with pedal position sensor 3a and shank position sensor 103.Pedal position sensor 3a detects the operating position of foot pedal 3.Shank position sensor 103 detects the left and right directions shift position of shank 31 and eedle 32.Input interface 5d gives CPU5a with the testing result of pedal position sensor 3a and shank position sensor 103.CPU5a carries out action described later according to the testing result of pedal position sensor 3a.CPU5a moves the testing result of shank position sensor 103 as aftermentioned feedback information uses.

The output interface 5e of control device 5 moves the driving loop 73 of motor 36 with driving loop 71, the driving loop 72 of presser feet motor 22, the shank of the driving loop 70 of motor of sewing machine 2, feeding motor 13, the driving loop 75 of being connected with the cutter driving solenoid in the driving loop 74 of loose ends solenoid 45 is connected.The CPU5a of control device 5 exports control signals by output interface 5e to driving loop 70～75.Feeding motor 13, presser feet motor 22 and shank move motor 36 and are rotated according to the control signal of CPU5a.Feeding motor 13 drives feed mechanism 10.Therefore, processing cloth moves along fore-and-aft direction.Presser feet motor 22 drives presser feet 12 and rises.The presser feet 12 that rises leaves from delivery sheet 11, removes pressing processing cloth.Shank moves motor 36 and back and forth drives shank 31 and eedle 32 along left and right directions.As mentioned above, shank 31 and eedle 32 alternately rise, descend in the mobile terminal of left and right directions, form keyhole stitch seam 60.

Loose ends solenoid 45 and cutter driving solenoid 81 move according to the control signal of CPU5a.As mentioned above, the tension force of upper thread 33 reduces by the action of loose ends solenoid 45.Cutting knife 51 descends by the action of cutter driving solenoid 81, forms buttonhole 65 at processing cloth.

The output interface 5e of control device 5 is connected with guidance panel 4.The CPU5a of control device 5 exports control signal by output interface 5e to the display part that is arranged at guidance panel 4.Display part carries out necessary demonstration according to the control signal of CPU5a.

The ROM5b stored parameter of control device 5 is set auxiliary routine, calculation of parameter program, stitch data generator, is made control program etc.The setting parameter auxiliary routine is the program of the setting of auxiliary sewing parameter.The calculation of parameter program is to calculate the program of the part of sewing parameter.The stitch data generator is the program that generates stitch data according to sewing parameter.Making control program is to carry out the program of making action according to the stitch data that generates.

Fig. 8 is the key diagram that forms the required sewing parameter of keyhole stitch seam 60.Keyhole stitch seam 60 is stitched length A, front noose length D1, rear noose length D2, space (=front space YE+ rear space YS), cutting knife front and back, front and back correction value Δ Y, cutting knife left and right sides space X S and left and right sides correction value Δ X as sewing parameter with cutting knife length S, complications.

Cutting knife length S is cutting knife 51 length of using during buttonhole 65 forms.Shown in figure below of Fig. 8, cutting knife length S and buttonhole 65 equal in length.Front and back correction value Δ Y is the value of revising for to the fore-and-aft direction error of cutting knife 51 installation sites.The CPU5a of control device 5 calculates cutting knife length S and front and back correction value Δ Y with cutter sensor 105 output signals and feeding position sensor 101 output signals and according to sewing parameter calculation procedure described later.The operator also can not set cutting knife length S and front and back correction value Δ Y.

Tortuous seam length A is the length that is formed at left zigzag part 61 and the right zigzag part 62 of buttonhole 65 left and right sides.Front noose length D1 is front casing-joining part 63 length that are formed at buttonhole 65 front portions.Rear noose length D2 is rear casing-joining part 64 length that are formed at buttonhole 65 rear portions.Front space YE is the interval of buttonhole 65 front ends (lower end of Fig. 8) and front casing-joining part 63.Rear space YS is the interval of buttonhole 65 rear ends (upper end of Fig. 8) and rear casing-joining part 64.Cutting knife left and right sides space X S is the left and right directions interval of left zigzag part 61 and right zigzag part 62.Left and right sides correction value Δ X is the value of revising for to the left and right directions error in mounting position of cutting knife 51.

The operator sets left and right sides correction value Δ X, cutting knife left and right sides space X S, space (YE+YS), cutting knife front and back, front noose length D1 and rear noose length D2 by operating operation panel 4.Tortuous seam length A is cutting knife length S (length of buttonhole 65) and space (YE+YS), cutting knife front and back sum.

The CPU5a of control device 5 moves according to the setting parameter auxiliary routine, gives guidance panel 4 with control signal.The display part of guidance panel 4 shows according to control signal, urges the setting of sewing parameter.The operator comes operating operation panel 4 with reference to the demonstration of display part, sets successively by this left and right sides correction value Δ X, cutting knife left and right sides space X S, space (YE+YS), cutting knife front and back, front noose length D1 and rear noose length D2.

With reference to Fig. 9, the calculation procedure of cutting knife length S and front and back correction value Δ Y is described.The CPU5a of control device 5 is to feeding motor 13 output control signals, and feed mechanism 10 as origin position, and is begun action according to calculation of parameter program (with reference to Fig. 9).

" 0 " that the CPU5a of control device 5 is made as the expression origin position with the current location Y of cutter sensor 105 (S5).The CPU5a of control device 5 drives feeding 13 1 pulses of motor (S10) to driving loop 71 output control signals.Pulsed quantity of feed mechanism 10 actions.Feeding table 11, presser feet 12 and cutter sensor 105 move specific length, for example 0.05mm towards the place ahead.The CPU5a of control device 5 is updated to " Y+0.05 " (S15) with the current location Y of cutter sensor 105.

The CPU5a of control device 5 checks (S20) to the output signal that has or not cutter sensor 105.When the output signal of cutter sensor 105 is arranged (S20: be), the CPU5a of control device 5 is made as cutting knife 51 back-end location A (S25) with the current location Y of cutter sensor 105.Back-end location A for example is stored in the RAM5c.Cutter sensor 105 moves towards the place ahead from the unit of origin position with 0.05mm.Back-end location A is the position of cutter sensor 105 when detecting cutting knife 51 at first.Back-end location A can go out with the accuracy detection of 0.05mm.

When not having the output signal of cutter sensor 105 (S20: no), whether limit positions (for example 50mm) checks (S30) to the CPU5a of control device 5 to the current location Y of cutting knife 51.When current location Y is not limit positions (S30: no), the CPU5a of control device 5 makes to process and returns S10, repeatedly carries out the action of S10, S15 and S20.When current location Y is limit positions (S30: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.

Even move to limit positions when also can't detect cutting knife 51 (output signal that does not have cutter sensor 105) at cutter sensor 105, the CPU5a error process of control device 5.During mistake was processed, the CPU5a of control device 5 gave guidance panel 4 with control signal.The display part of guidance panel 4 comes execution error to show according to control signal.

After having determined back-end location A, the CPU5a of control device 5 drives feeding 13 1 pulses of motor (S40) to driving loop 71 output control signals.Pulsed quantity of feed mechanism 10 actions.Feeding table 11, presser feet 12 and cutter sensor 105 move 0.05mm towards the place ahead.The CPU5a of control device 5 is updated to " Y+0.05 " (S45) with the current location Y of cutter sensor 105, and the output signal that has or not cutter sensor 105 is checked (S50).When not having the output signal of cutter sensor 105 (S50: be), the CPU5a of control device 5 is made as front position B (S60) with the current location Y of cutting knife 51.Front position B for example is stored in the RAM5c.

Cutter sensor 105 moves towards the place ahead with the unit of 0.05mm from back-end location A.Front position B is the position of cutter sensor 105 cutter sensor 105 when can't detect at first.Back-end location B can go out with the accuracy detection of 0.05mm.

When the output signal of cutter sensor 105 is arranged (S50: no), whether limit positions (for example 50mm) checks (S55) to the CPU5a of control device 5 to the current location Y of cutter sensor 105.When current location Y is not limit positions (S55: no), the CPU5a of control device 5 makes to process and returns S40, repeatedly carries out the action of S40, S45 and S50.When current location Y is limit positions (S50: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.

Even move to limit positions also can detect cutting knife 51 time at cutter sensor 105, the CPU5a error process of control device 5.As mentioned above, in mistake was processed, the CPU5a of control device 5 gave guidance panel 4 with control signal.The display part of guidance panel 4 comes execution error to show according to control signal.Limit positions is the value of determining according to the specification of button holing sewing machine M, is not limited to above-mentioned 50mm.

Mistake shows it is the demonstration that the abnormalities such as installation cutting knife 51, cutter sensor 105 break down are forgotten in expression.The operator shows by error in observation, can implement suitable counter-measure.The CPU5a of control device 5 also can forbid making action in mistake is processed.Even when not to be noted wrong demonstration of operator, also can't begin to make.

After having determined back-end location A and front position B, the CPU5a of control device 5 calculates cutting knife length S and front and back correction value Δ Y (S65).The CPU5a Continuous Drive feeding motor 13 of control device 5 makes feed mechanism 10 reset into origin position (S70), finishes the calculation of parameter program.

Cutting knife length S is poor (S=B-A) of front position B and back-end location A.Front and back correction value Δ Y is the poor of front position B and initial position (for example 49mm).Initial position is the front position of the cutting knife 51 installed when dispatching from the factory of button holing sewing machine M.Before and after cutting knife 51 installation sites of correction value Δ Y after representing to change on fore-and-aft direction with respect to the positional offset amount of initial position.

Initial position is the value that the kind of the cutting knife 51 installed according to the specification of button holing sewing machine M, when dispatching from the factory etc. is determined, is not limited to above-mentioned 49mm.The CPU5a of the S65 of execution parameter calculation procedure is equivalent to size calculating part and correction value calculating part.

Figure 10 is the chart of the concrete example of expression cutting knife length S and front and back correction value Δ Y.Case 1～3rd, the example the when cutting knife 51 that size is different is correctly installed.Case 4 is examples that the cutting knife 51 position deviation ground identical with case 3 are installed.Front and back correction value Δ Y only produces in case 4.

Button holing sewing machine M of the present invention comprises cutter sensor 105 and control device 5.Cutter sensor 105 detects front position and the back-end location of cutting knife 51.Control device 5 usefulness cutter sensors, 105 detected front positions and back-end location also calculate cutting knife length S and front and back correction value Δ Y according to the sewing parameter calculation procedure.Move motor 36, loose ends solenoid 45 etc. and form making in the control action of keyhole stitch seam at control motor of sewing machine 2, feeding motor 13, presser feet motor 22, shank, control device 5 uses and comprises the cutting knife length S that calculates and the sewing parameter of front and back correction value Δ Y.

Cutting knife length S and front and back correction value Δ Y use the testing result of employed cutting knife 51 and the exact value that calculates.After the operator changes cutting knife 51, needn't set the cutting knife length as sewing parameter.Front and back correction value Δ Y is equivalent to the error of actual installation position with the correct installation site of cutting knife 51.Front and back correction value Δ Y is used for revising alignment error.When changing cutting knife 51, the operator needn't install cutting knife 51 exactly.After changing cutting knife 51, the operator can begin to make in the situation of not carrying out test running.

Cutter sensor 105 detects cutting knife 51 back-end location A and front position B.Cutting knife length S can calculate exactly as the difference of back-end location A and front position B.Front and back correction value Δ Y can calculate with the difference of reference position exactly as front position B (or back-end location A).

Cutter sensor 105 is arranged at the feed mechanism 10 that processing cloth is moved do feeding.Cutter sensor 105 is mobile along fore-and-aft direction (length direction of cutting knife 51) by the action of feed mechanism 10.The back-end location A of cutting knife 51 and front position B detect as cutter sensor 105 that the position of feed mechanism 10 can easily detect during the cutting knife 51.

The below describes the second embodiment of button holing sewing machine M of the present invention.Such as Figure 11, shown in Figure 12, the cutting knife 51 of the second embodiment can carry out above-below direction and move with fore-and-aft direction and move.

Cutting knife 51 rises, descends by the action of driving mechanism 80 up and down, and moves along fore-and-aft direction by the action of front and back driving mechanism 90.Up and down driving mechanism 80 with cutter driving solenoid 81 as drive source.Before and after driving mechanism 90 with cutter drive motor 91 as drive source.Cutter drive motor 91 is stepper motors.

As shown in figure 11, button holing sewing machine M comprises and moves up and down plate 98.Move up and down plate 98 and can be supported in up or down horn 8 (with reference to Fig. 2) front end bottom.Move up and down plate 98 and have the guide rail 98a that extend front and back in its underpart.Guide rail 98a is with to move forward and backward plate 97 chimeric.Moving forward and backward plate 97 can move along fore-and-aft direction by the guiding of guide rail 98a.Cutting knife 51 is installed in and is fixed on the supporting member 52 that moves forward and backward plate 97 bottoms.

Cutter bar 53 embeds a part that moves up and down plate 98 revolvably.As shown in figure 12, the embedded location of cutter bar 53 is positions of leaving from front and back movable plate 97.Cutter bar 53 has the linking arm 96 that is fixed in its bottom.Linking arm 96 is supporting slider 96a at it towards the leading section that front and back movable plate 97 extends.Slider 96a can be rotated centered by the axle of above-below direction.Move forward and backward plate 97 and comprise the groove 97a that can supply slider 96a to embed.As shown in figure 12, cutter bar 53 be connected plate 97 by slider 96a is connected with groove 97a is chimeric.

Cutter bar 53 can be rotated centered by the axle of above-below direction.The front end of linking arm 96 swings by the rotation of cutter bar 53.Move forward and backward plate 97 and cutting knife 51 moves up in front and back along guide rail 98a by the swing of linking arm 96.

Cutter bar 53 tops are projected into and move up and down plate 98 upsides.As shown in figure 11, barrel member 82 is embedded in cutter bar 53 upper outside.Cutter bar 53 is in barrel member 82 interior rotations.Cutter bar 53 and barrel member 82 along the vertical direction one move.Moving up and down plate 98 and cutting knife 51 rises, descends by cutter bar 53 and barrel member 82 are mobile along the vertical direction.

Driving mechanism 80 comprises cutter driving solenoid 81, axle retaining member 83, swing arm 85 and spring 86 up and down.The above-below direction that axle retaining member 83 is fixed in barrel member 82 is pars intermedia roughly.Axle retaining member 83 is connected with swing arm 85.Swing arm 85 is disposed at axle retaining member 83 rears.Swing arm 85 is the L font bars that swing centered by the axle 85a of left and right directions.Axle retaining member 83 is connected with the arm that extends towards the place ahead of swing arm 85.This arm by spring 86 towards the top application of force.Cutter driving solenoid 81 is disposed at swing arm 85 rears.Cutter driving solenoid 81 has the plunger 81a that extends towards the place ahead.

Plunger 81a can give prominence to towards the place ahead.Swing arm 85 swings by the outstanding of plunger 81a.Swing arm 85 leading sections are depressed barrel member 82 by axle retaining member 83.Cutting knife 51 moves towards the below by barrel member 82 and cutter bar 53 and descends.

When cutter driving solenoid 81 was in non-driven state, swing arm 85 swung (the arrow X2 direction of Figure 13 A) by the effect of the power of spring 86.Swing arm 85 leading sections lift barrel member 82 by axle retaining member 83.Cutting knife 51 moves towards the top by barrel member 82 and cutter bar 53 and rises.

Figure 13 A represents the state after cutting knife 51 rises.Figure 13 B represents the state after cutting knife 51 descends.Arrow X1 among Figure 13 A, the arrow X5 among Figure 13 B represent the direction of action of plunger 81a.Arrow X2 among Figure 13 A, the arrow X6 among Figure 13 B represent the swaying direction of swing arm 85.Arrow X3, the arrow X7 among Figure 13 B among Figure 13 A are the moving directions of barrel member 82 and cutter bar 53.Arrow X4 among Figure 13 A, the arrow X8 among Figure 13 B represent the moving direction of cutting knife 51.

Before and after driving mechanism 90 comprise cutter drive motor 91 and two swing arms 93,94.Cutter drive motor 91 is disposed at cutter bar 53 and barrel member 82 lefts.Cutter drive motor 91 has the output shaft 91a that extends towards the top.Swing arm 93 is fixed in output shaft 91a upper end.

Cutter bar 53 upper ends are projected into barrel member 82 outsides.Swing arm 94 is fixed in the ledge of cutter bar 53.Swing arm 94 is supporting slider 94a at it towards the leading section that swing arm 93 extends.Slider 94a can be rotated centered by the axle of above-below direction.Swing arm 93 comprises can be for the groove 93a of slider 94a embedding.Groove 93a extends towards base portion from swing arm 93 leading sections.Swing arm 93,94 is by making slider 94a be connected with groove 93a is chimeric.Slider 94a can move along groove 93a.

Swing arm 93 swings by the driving of cutter drive motor 91.The swing of swing arm 93 is delivered to swing arm 94 by the slider 94a of slippage in groove 93a.Cutter bar 53 is rotated by the swing of swing arm 94.Move forward and backward plate 97 and cutting knife 51 moves along fore-and-aft direction as mentioned above.Cutting knife 51 moves along fore-and-aft direction by the driving of cutter drive motor 91.

Figure 14 A represents the state after cutting knife 51 moves towards the place ahead.Figure 14 B represents the state after cutting knife 51 moves towards the rear.Arrow Y1, Y2 among Figure 14 A, arrow Y5, Y6 among Figure 14 B represent swing arm 93,94 swaying direction.Arrow Y3 among Figure 14 A, the arrow Y7 among Figure 14 B represent the direction of rotation of cutter bar 53.Arrow Y4 among Figure 14 A, the arrow Y9 among Figure 14 B represent the moving direction of cutting knife 51.

Such as Figure 13, shown in Figure 14, the fore-and-aft direction of cutting knife 51 moves under the state after cutting knife 51 risings and produces.The fore-and-aft direction shift position of cutting knife 51 utilizes cutter location sensor 104 (with reference to Figure 15) to detect.As shown in figure 15, cutter location sensor 104 is connected with the input interface 5d of control device 5.Cutter location sensor 104 for example is the rotary encoder that the position of rotation to cutter drive motor 91 detects.The output signal of cutter location sensor 104 outputs to CPU5a by input interface 5d.The shift position that CPU5a calculates cutting knife 51 according to the output that is stored in the interior origin position of ROM5b and cutter location sensor 104.

Cutter sensor 105 detects front position and the back-end location of the cutting knife 51 that moves forward and backward.Cutter sensor 105 is the reflection type optical sensors that have in the central the light projection unit, have light receiver at this light projection unit periphery.Cutter sensor 105 is towards the fore-and-aft direction mobile route fixed configurations of cutting knife 51.For example, cutter sensor 105 is fixed in pressure handle 18 (with reference to Fig. 2).Cutter sensor 105 can be along cutting knife length direction Relative Displacement with respect to cutting knife 51.

The output interface 5e of control device 5 is connected with the driving loop 76 of cutter drive motor 91.The CPU5a of control device 5 exports control signals by output interface 5e towards driving loop 76.Cutter drive motor 91 is rotated according to the control signal of CPU5a.Other structure of control system shown in Figure 15 is identical with control system shown in Figure 7, and the description thereof will be omitted.

The control device 5 of Figure 15 moves according to calculation of parameter program (with reference to Figure 16), calculates by this sewing parameter (cutting knife length S and front and back correction value Δ Y).The calculation of parameter program of Figure 16 comprises the step identical with the calculation of parameter program of Fig. 9 (having marked the number of steps identical with Fig. 9).

Rise and move under the state (with reference to Figure 14 A) of forefront control device 5 beginnings action shown in Figure 16 at cutting knife 51.The CPU5a of control device 5 is made as " 0 " (S5) with the current location Y of cutting knife 51.The CPU5a of control device 5 drives 91 1 pulses of cutter drive motor (S10A) to driving loop 76 output control signals.Cutting knife 51 is a mobile pulsed quantity (for example 0.05mm) towards the rear.The CPU5a of control device 5 is updated to " Y+0.05 " (S15A) with the current location Y of cutting knife 51.

The CPU5a of control device 5 checks (S20A) to the output signal that has or not cutter sensor 105.When output signal is arranged (S20A: be), the CPU5a of control device 5 is made as back-end location A (S25) with the current location Y of cutting knife 51.When not having output signal (S20A: no), whether limit positions (for example 50mm) checks (S30) to the CPU5a of control device 5 to the current location Y of cutting knife 51.When current location Y is not limit positions (S30: no), the CPU5a of control device 5 makes to process and returns S10A, repeatedly carries out the action of S10A～S20A.When current location Y is limit positions (S30: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.Mistake is processed identical with the content that illustrates in the step of Fig. 9.

After having determined back-end location A, the CPU5a of control device 5 drives 91 1 pulses of cutter drive motor (S40A) to driving loop 76 output control signals.Cutting knife 51 is mobile pulsed quantity towards the rear.The CPU5a of control device 5 is updated to " Y+0.05 " (S45A) with the current location Y of cutting knife 51.The CPU5a of control device 5 checks (S50A) to the output signal that has or not cutter sensor 105.When not having the output signal of cutter sensor 105 (S50A: be), the CPU5a of control device 5 is made as front position B (S55) with the current location Y of cutting knife 51.

When the output signal of cutter sensor 105 is arranged (S50A: no), whether limit positions checks (S60) to the CPU5a of control device 5 to the current location Y of cutting knife 51.When current location Y is not limit positions (S60: no), the CPU5a of control device 5 makes to process and returns S40A, repeatedly carries out the action of S40A～S50A.When current location Y is limit positions (S60: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.

After having determined back-end location A and front position B, the CPU5a of control device 5 calculates cutting knife length S and front and back correction value Δ Y (S65).The CPU5a Continuous Drive cutter drive motor 91 of control device 5 makes cutting knife 51 reset into origin position (S70A), finishes the calculation of parameter program.Cutting knife length S and front and back correction value Δ Y calculate by step illustrated in fig. 9.Shown in Figure 14 A, the origin position of cutting knife 51 is that cutting knife 51 rises and moves to the position at rear.

Figure 17 and calculation of parameter program representation shown in Figure 180 calculate the step of sewing parameter (cutting knife length S and front and back correction value Δ Y) by mobile cutting knife 51 and cutter sensor 105 both sides.Cutting knife 51 moves along fore-and-aft direction by the driving of cutter drive motor 91.Cutter sensor 105 is installed on the part of feed mechanism 10.Cutter sensor 105 moves along fore-and-aft direction by the driving of feeding motor 13.

The step of S5～S20 of Figure 17 is identical with the step of S5～S20 of Fig. 9.The CPU5a of control device 5 drives feeding motor 13 with the unit of a pulse, is determined with the output without cutter sensor 105.When the output of cutter sensor 105 is arranged (S20: be), the CPU5a of control device 5 is made as cutting knife 51 back-end location A (S25) with the current location Y of cutter sensor 105.

When not having the output of cutter sensor 105 (S20: no), the CPU5a of control device 5 moves according to S10A～S20A.The step of S10A～S20A is identical with the step of S10A～S20A of Figure 16.The CPU5a of control device 5 drives cutter drive motor 91 with the unit of a pulse, is determined with the output without cutter sensor 105.When the output of cutter sensor 105 is arranged (S20A: be), the CPU5a of control device 5 is made as cutting knife 51 back-end location A (S25) with the current location Y of cutter sensor 105.

When not having the output of cutter sensor 105 (S20A: no), whether limit positions (for example 50mm) checks (S30) to the CPU5a of control device 5 to current location Y.When current location Y is not limit positions (S30: no), the CPU5a of control device 5 makes to process and returns S10, repeatedly carries out the action of S10～S20A.When current location Y is limit positions (S30: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.Mistake is processed identical with the content that illustrates in the step of Fig. 9.

After having determined back-end location A, the CPU5a of control device 5 moves according to S40～S50.The step of S40～S50 is identical with the step of S40～S50 of Fig. 9.The CPU5a of control device 5 drives feeding motor 13 with the unit of a pulse, is determined with the output without cutter sensor 105.When not having the output of cutter sensor 105 (S50: be), the CPU5a of control device 5 is made as the current location Y of cutter sensor 105 the front position B (S55) of cutting knife 51.

When the output of cutter sensor 105 is arranged (S50: no), the CPU5a of control device 5 moves according to S40A～S50A.The step of S40A～S50A is identical with the step of S40A～S50A of Figure 16.The CPU5a of control device 5 drives cutter drive motor 91 with the unit of a pulse, is determined with the output without cutter sensor 105.When not having the output of cutter sensor 105 (S50A: be), the CPU5a of control device 5 is made as the current location Y of cutter sensor 105 the front position B (S55) of cutting knife 51.

When the output of cutter sensor 105 is arranged (S50A: no), whether limit positions (for example 50mm) checks (S60) to the CPU5a of control device 5 to current location Y.When current location Y is not limit positions (S60: no), the CPU5a of control device 5 makes to process and returns S40, repeatedly carries out the action of S40～S50A.When current location Y is limit positions (S60: be), the CPU5a error process (S35) of control device 5 finishes the calculation of parameter program.Mistake is processed identical with the content that illustrates in the step of Fig. 9.

After having determined back-end location A and front position B, the CPU5a of control device 5 calculates cutting knife length S and front and back correction value Δ Y (S65).The CPU5a of control device 5 drives cutter drive motor 91, makes cutting knife 51 reset into origin position (S70A), and drives feeding motor 13, makes feed mechanism 10 reset into origin position (S70), finishes the calculation of parameter program.

Cutting knife length S and front and back correction value Δ Y calculate by step illustrated in fig. 9.The origin position of cutting knife 51 and feed mechanism 10 as mentioned above.

Figure 17, step shown in Figure 180 are that cutter sensor 105 and cutting knife 51 both sides are moved.Therefore, can shorten calculating sewing parameter (cutting knife length S and front and back correction value Δ Y) the required time.Keyhole stitch seam both can form before buttonhole forms, and also can form after buttonhole forms.The formation of buttonhole also can be carried out in the forming process of keyhole stitch seam.

Can be clear and definite according to top detailed description, in the button holing sewing machine of the present invention, the sewing parameter calculating part calculates a part that forms the required sewing parameter of keyhole stitch seam.When changing cutting knife, the operator needn't set the part of sewing parameter, and sewing parameter is set does not need more labour and time.The sewing parameter calculating part calculates sewing parameter accurately with the testing result of the actual cutter location of installing.Button holing sewing machine moves exactly according to the sewing program that uses the sewing parameter that calculates.The operator can begin to make in the situation of not carrying out test running and sewing program correction.Operator's labour bears significantly and alleviates.

Claims (3)

1. button holing sewing machine, comprise: cut off processing cloth and form the cutting knife of buttonhole and the cutting knife supporting member that this cutting knife is installed in mounting or dismounting freely, by moving according to sewing parameter, around the buttonhole that described cutting knife forms, form keyhole stitch seam, it is characterized in that, comprising:

Cutter sensor, this cutter sensor detects the position of described cutting knife; And

The sewing parameter calculating part, this sewing parameter calculating part calculates the part of described sewing parameter according to the position of the detected described cutting knife of described cutter sensor,

Described sewing parameter calculating part comprises: the size calculating part, and this size calculating part calculates the length dimension of described cutting knife; And the correction value calculating part, this correction value calculating part calculates the correction value of revising for to the length direction error in mounting position of described cutting knife.

2. button holing sewing machine as claimed in claim 1 is characterized in that, described cutter sensor detects length direction leading section position and the rearward end position of described cutting knife.

3. button holing sewing machine as claimed in claim 2 is characterized in that, described cutter sensor is installed on installation component, and this installation component can be along the length direction Relative Displacement of this cutting knife with respect to described cutting knife.

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