CN101545180A - Cloth cutting device of button hole catch sewing machine - Google Patents

Abstract

The invention provides a cloth cutting apparatus for a button hole catch sewing machine, which is capable of cycle period reduction while interval between the cutting knife and the cutting knife opposite portion enlarges. The control portion is capable of execution in a detection mode and a cloth cutting mode. In the detection mode, pulse number of the pulse electric motor is counted on one hand and the pulse electric motor rotates at a determined speed on the other hand. The cutting knife approaches to the cutting knife opposite portion. Once the detection result of the rotation amount detection portion deviates from the input pulse of the pulse electric motor, the pulse electric motor stops, and the count value when stopping is stored as overlapping pulse number. In the cloth cutting mode, the pulse number of the pulse electric motor is counted on one hand, the pulse electric motor rotates at a first determined speed until the count value reaches the overlapping pulse number. As the counting value is counted from the overlapping pulse number to a determined pulse number, the pulse electric motor rotates at a second determined speed lower than a first determined speed, the cutting knife and the cutting knife opposite portion approaches to and cuts the cloth.

Description

The cloth cut off device of buttonholing machine

Technical field

The present invention relates to a kind of cloth cut off device that on sewn objects such as cloth, forms the buttonholing machine of hole portions such as button hole.

Background technology

Known a kind of buttonholing machine, it is to form button hole (below be called round-nose button hole) on the cloth at sewn object usually, its hole portion by droplet-like is that the straight hole portion (notch) of round hole part and the linearity that links to each other with this circular hole constitutes, around the round-nose button hole of cloth, automatically perform a series of lock seaming simultaneously and make, form stitching.

This serging machine has cloth cut off device, it is under the state that cloth is configured between the relative portion of cutting knife that has with the cutting knife of the corresponding point of a knife of the shape of round-nose button hole and relative configuration with this cutting knife, by in the relative portion with cutting knife of cutting knife one is moved up and down both are engaged, on cloth, form round-nose button hole.

In having the buttonholing machine of above-mentioned cloth cut off device, for the cloth that is arranged on regularly on the feeding platform, form round-nose button hole by the cloth shut-off mechanism, then, feeding platform (cloth) is moved so that needle bar moves around the round-nose button hole of cloth, drive stitching formation mechanisms such as suture needle simultaneously, carry out lock seaming and makes.Then, drive cloth cut off device and form round-nose button hole.

For example shown in the record of patent documentation 1, known a kind of Sewing machines, it uses pulse motor as cutting knife is moved up and down and the drive source that relative portion with cutting knife engages.Rotatablely moving of pulse motor is passed to cutting knife via linkage etc., and it is fallen towards the relative subordinate of cutting knife, and the point of a knife of cutting knife overlaps with the relative portion with cutting knife of state across cloth, forms round-nose button hole on cloth.

In addition, the paired pulses motor is controlled, so that the origin position that rises from cutting knife, before being about to arrive the position of the coincidence of relative portion with cutting knife cutting knife is descended at a high speed, be decelerated to low speed then and drop to the coincidence position, cut off cloth by being pressed into cutting knife.In addition, after cut-out, cutting knife is risen at a high speed and be reset to origin position.

Specifically describe with reference to Figure 11.If the arrival cloth cuts off regularly T101 of beginning, then make pulse motor accelerate to (for example 4000pps) at a high speed, this speed after the maintenance stipulated time, is decelerated to low speed (for example 1000pps).Deceleration stop timing T102 is set in the place ahead (for example position of 1000 pulses) that overlaps timing T103 here.Then, the driven at low speed pulse motor moves to regularly T103 of coincidence until cutting knife.After cutting knife arrives coincidence timing T103, continue with the driven at low speed pulse motor, drive being produced pressing force by the cloth of the relative portion of cutting knife clamping, the cut-out cloth by this with cutting knife.Temporary transient then stop pulse motor (stopping regularly T104), then, high speed reverse rotation driving pulse motor makes cutting knife be reset to origin position.This reset position is that regularly T105 is finished in the cloth cut-out.

Here, finish regularly T102 to stopping regularly 104 umber of pulse from deceleration, be stored as a plurality of data as different umber of pulses,, can select the data of pairing umber of pulse based on kind, the material of cloth, the thickness of the relative portion of cutting knife when cutting off cloth.

Patent documentation 1: the spy opens communique 2001-No. 334088

Summary of the invention

Owing to cut off repeatedly, the point of a knife of cutting knife always contacts with the same position of the relative portion of cutting knife, forms the cutting knife vestige thereby the contact site of the relative portion of cutting knife can wear and tear, and institute is so that the reduction of cut-out ability.Therefore, carry out the surface of the relative portion of cutting knife is carried out grinding and made it smooth, remove the operation of cutting knife vestige.But, if because the surface of the relative portion of grinding cutting blades, then the surface location of the relative portion of cutting knife changes downwards, thus big with the interval change of cutting knife, with the change in location that overlaps of cutting knife, can't obtain enough cut-out power.

Therefore, as shown in figure 12, even retreat also and can produce enough pressing forces in order make to overlap regularly T103, need reset with increase above-mentioned pulse motor at deceleration stop timing T102 to stopping the regularly umber of pulse of T104.But, cause the running interval under the low speed elongated in the situation that increases umber of pulse between this position, prolonged circulation timei.

Problem of the present invention is, when the interval between the relative portion with cutting knife of cutting knife enlarges, suppresses the running interval under the low speed as far as possible, realizes the shortening of circulation timei.

The cloth cut off device of the buttonholing machine that the invention of technical scheme 1 record is related is characterized in that having: cutting knife, and it has point of a knife; The relative portion of cutting knife, itself and above-mentioned cutting knife relatively dispose, and cut off cloth with the point of a knife co-operating of above-mentioned cutting knife; Travel mechanism, its with above-mentioned cutting knife or the relative portion of above-mentioned cutting knife in a binding, it is moved up and down; Driving shaft, it rotatably is supported on the sewing machine stand, link with above-mentioned travel mechanism, thus by rotation make above-mentioned cutting knife and above-mentioned cutting knife in portion one with respect to another is approaching/move with leaving; Pulse motor, itself and above-mentioned driving shaft link; The rotation amount test section, it detects the rotation amount of above-mentioned pulse motor; And control part, it controls above-mentioned pulse motor based on the testing result of above-mentioned rotation amount test section,

Above-mentioned control part can be carried out detecting pattern and cloth lockout mode, this detecting pattern is, make above-mentioned cutting knife and the relative portion of above-mentioned cutting knife near the time, above-mentioned pulse motor is rotated with fixing speed from origin position, when between from the input pulse of the testing result of above-mentioned rotation amount test section and above-mentioned pulse motor, producing deviation, above-mentioned pulse motor is stopped, the testing result from the rotation amount test section when simultaneously this being stopped is stored as the coincidence impulse number, this cloth lockout mode is, make above-mentioned cutting knife and the relative portion of above-mentioned cutting knife near the time, above-mentioned pulse motor is rotated with the 1st setting speed at a high speed, become above-mentioned coincidence impulse number until testing result from above-mentioned rotation amount test section, make of the 2nd setting speed rotation of above-mentioned pulse motor then, until the testing result from above-mentioned rotation amount test section begins through the predetermined pulse number from above-mentioned coincidence impulse number till with low speed.

The invention of technical scheme 2 record is characterised in that, in the cloth cut off device of the buttonholing machine of technical scheme 1 record,

Above-mentioned control part is when carrying out above-mentioned detecting pattern, on one side the umber of pulse of above-mentioned pulse motor is counted, make above-mentioned pulse motor with the 3rd setting speed rotation higher on one side than the fixing speed of above-mentioned detecting pattern, become the noncontact umber of pulse that the relative portion with above-mentioned cutting knife of above-mentioned cutting knife does not contact until above-mentioned count value, if above-mentioned count value becomes the noncontact umber of pulse, then make of the fixing speed rotation of above-mentioned pulse motor with above-mentioned detecting pattern, thereby, above-mentioned driving shaft and above-mentioned travel mechanism are driven, make the relative portion of above-mentioned cutting knife approaching with above-mentioned cutting knife, if produce deviation in the testing result from above-mentioned rotation amount test section, above-mentioned pulse motor is stopped, and the count value when simultaneously this being stopped to be stored as the coincidence impulse number.

The invention of technical scheme 3 record is characterised in that, in the buttonholing machines of technical scheme 1 or 2 records,

The 2nd setting speed of the fixing speed of above-mentioned detecting pattern and above-mentioned cloth lockout mode is consistent, and above-mentioned the 1st setting speed of above-mentioned cloth lockout mode is consistent with the 3rd setting speed of above-mentioned detecting pattern.

The effect of invention

According to the present invention, owing to when carrying out cloth cutting knife pattern, pulse motor is rotated until arriving by the detected umber of pulse of detecting pattern, so the running interval under can enlarging at a high speed as far as possible at a high speed.If this detecting pattern is carried out after the relative portion of grinding cutting blades,, shortened circulation timei even, also can suppress the running interval under the low speed as far as possible then because of the interval expansion of maintenance cutting knife and the relative portion of cutting knife.

Description of drawings

Fig. 1 is the side view of the schematic configuration of the related Sewing machines of expression present embodiment.

Fig. 2 is the oblique view of the schematic configuration of the related cloth cut off device of expression present embodiment.

Fig. 3 is the key diagram of the shape and the snap-fit relationship of the point of a knife of the cutting knife that cloth cut off device had of presentation graphs 2 and the relative portion of cutting knife, (a) the relative portion of cutting knife of expression S size, (b) the relative portion of cutting knife of expression M size, (c) the relative portion of cutting knife of expression L size.

Fig. 4 is the block diagram of main control structure of the Sewing machines of presentation graphs 1.

Fig. 5 is the output signal of A phase of encoder of presentation graphs 4 and the key diagram of B output signal mutually.

Fig. 6 is when being illustrated in the relative portion with cutting knife of the cutting knife butt of Fig. 3, the figure of the relation during the driving pulse motor between the moment of torsion of the departure of encoder and pulse motor.

Fig. 7 is the flow chart of the flow process of the detecting pattern carried out of the cloth cut off device of presentation graphs 2.

The figure of the departure of revolving rotary speed degree, umber of pulse, encoder of the pulse motor when Fig. 8 is the detecting pattern of expression execution graph 7.

Fig. 9 is the flow chart of the flow process of the cloth lockout mode carried out of the cloth cut off device of presentation graphs 2.

The figure of rotary speed, the umber of pulse of the pulse motor when Figure 10 is the cloth lockout mode of expression execution graph 9, the departure of encoder.

Figure 11 is the rotary speed of pulse motor when cloth cuts off, the figure of umber of pulse that the existing cloth cut off device of expression has.

Figure 12 is the original state of the pulse motor that has of the existing cloth cut off device of expression and carries out the rotary speed of cloth when cutting off, the figure of umber of pulse after maintenance.

The specific embodiment

Below, with reference to the cloth cut off device of an example of description of drawings embodiments of the present invention.

As shown in Figure 1, have the Sewing machines 1 of this routine cloth cut off device 30 (in Fig. 2, illustrating), have as the basic structure of carrying out the Sewing machines that round-nose button hole lock seaming makes.Sewing machines 1 has the sewing machine table of sewing machine stand 5 and mounting sewing machine stand 5, and this sewing machine stand 5 has: pedestal part 2, and it forms essentially rectangular case shape; Vertical body portion 3, it is arranged on the rear portion of pedestal part 2; And arm 4, setting is forwards extended on its top from vertical body portion 3.

In addition, at the leading section of arm 4 needle bar 10 that the bottom has suture needle 6 is set, it extends downwards, can move up and down and swing to the left and right.In addition, looper device pedestal 11 is set on pedestal part 2, its top has the looper device 11a of portion, and this looper device 11a of portion has the wire grip (omit and illustrate) of the looper device relative with this needle bar 10 (omitting diagram) and auxiliary this looper device.In addition, each driving mechanism (omitting diagram) is set in sewing machine stand 5, they are used to make above-mentioned needle bar 10 to move up and down and swing, and synchronously drive looper device and wire grip with this needle bar 10 simultaneously.

In addition, the feeding platform 18 (illustrating with section among Fig. 1) of mounting cloth is set, on the upper surface part of this feeding platform 18, is provided for pushing simultaneously a pair of cloth pressing 19 of cloth in the upper surface part of pedestal part 2.These feeding platform 18 whole rectangular box shapes that form the thin type of open underneath, the surface is provided with the long peristome of fore-and-aft direction between above-mentioned a pair of cloth pressing 19 thereon.In addition, this feeding platform 18 utilizes the feed mechanism (omitting diagram) that is arranged in the pedestal part 2 and moves horizontally.

In addition, in Sewing machines 1, be arranged on the cloth cut off device 30 that forms round-nose button hole on the cloth.At this cloth cut off device 30 as described later.In addition, in Sewing machines 1, when utilizing cloth cut off device 30 on cloth, to form round-nose button hole, with needle bar 10 move up and down and the pin wobbling action cooperates and drives the looper device, by the co-operating of suture needle 6 and looper device, lockstitch a border at the round-nose button hole periphery and to make.

Below, cloth cut off device 30 is described.As shown in Figure 2, cloth cut off device 30 constitutes mainly to have: the relative portion 31 of cutting knife, and its shape with round-nose button hole is corresponding; Cutting knife 32, its relative portion 31 with cutting knife disposes relatively, forms point of a knife simultaneously in the upper end; Driving shaft 33, it rotatably is supported on the sewing machine stand 5; Pulse motor 34, it is used for driving shaft 33 is rotated driving; And reciprocating mechanism 35, it rotatablely moves by driving shaft 33, make cutting knife relative to portion 31 with respect to cutting knife 32 approaching/move with leaving.In addition, in Fig. 2,, omit the diagram of the primary structure portion of Sewing machines 1 in order to simplify accompanying drawing.

The resolution ratio that is fixed on the pulse motor 34 in the pedestal part 2 of vertical body portion 3 sides for example is 400 resolutions.The output shaft of pulse motor 34 disposes along the vertical direction, at front end fixed motor gear 36.In this pulse motor 34, be provided as the encoder 55 (with reference to Fig. 4) of rotation amount test section, for example, it is the encoder 55 of 400 resolutions that resolution ratio is set, and detects the rotation amount of this pulse motor 34.

In addition, in vertical body portion 3, the ball-screw parts 37 of Yan Shening utilize the bearing (omitting diagram) that is fixed on pedestal part 2 or the arm 4 up and down, are that the center can be supported in the vertical body portion 3 with rotating freely with it.

In addition, be fixed with gear 38 on the bottom of ball screw parts 37, itself and motor gear 36 mesh.Thus, the rotation driving by pulse motor 34 makes 37 rotations of ball screw parts.

In addition, vertically disposing housing 39 in the body portion 3, the nut (not shown) that meshes with ball screw parts 37 is set in this housing 39, by the rotation of ball screw parts 37, housing 39 moves up and down.In addition, in order to suppress the rotation of housing 39, the axle of Yan Shening (not shown) can run through housing 39 with being free to slide and be supported on the frame up and down.

In addition, linkage 40 is set on housing 39, it is made of pair of links 41,41 and lever 42.The lower end of pair of links 41,41 rotatably is supported on the both sides of housing 39, and the upper end rotatably is supported on the front end of two forks of the lever 42 of Y font roughly.The above-mentioned rotation of above-mentioned connecting rod 41,41 and lever 42 is to carry out around the rotating shaft along the bearing of trend of arm 4.

In addition, the driving shaft 33 that extends on the bearing of trend of arm 4 is arranged in the arm 4 in the mode that can rotate around the rotating shaft of bearing of trend.On vertical body portion 3 side ends of this driving shaft 33, fix the base end part of above-mentioned lever 42.Thus, if pulse motor 34 rotations, then by the rotation of ball screw parts 37, housing 39 moves up and down, and makes driving shaft 33 rotations via linkage 40.

As the reciprocating mechanism 35 of pinion and rack, have following parts and constitute: straight moving gear 44, it is fixed on the other end of driving shaft 33; And directly moving bar 45, itself and straight moving gear 44 engagements.Straight moving bar 45 extends upward at upper and lower, can be supported up or down with respect to arm 4.In addition, the periphery at straight moving bar 45 forms tooth-strip part 45a, straight moving gear 44 and this tooth-strip part 45a engagement.

That is, with driving shaft 33 rotations, straight moving bar 45 is moved up and down by straight moving gear 44.

In addition, directly protrude to the arm below lower end of moving bar 45, and the relative portion 31 of cutting knife can freely be installed with changing.In addition, can cutting knife 32 be installed freely with dismantling on pedestal part 2, its relative portion 31 with cutting knife relatively disposes.The point of a knife of cutting knife 32 as shown in Figure 3, an end forms ring-type, other end 32b forms linearity simultaneously.

On the other hand, as with the lower surface of the relative portion 31 of cutting knife of the holding section of the point of a knife of cutting knife 32 engaging, form can with the shape of a part of butt of an end 32a of cutting knife 32 and the other end 32b.Here, the relative portion 31 of cutting knife is shown in Fig. 3 (a)～(c), can use different S size, M size, the L sizes of length with the other end 32b of cutting knife 32 contact, will be installed on the pedestal part 2 with the relative portion 31 of cutting knife of the corresponding size of the length that cloth cuts off.

According to said structure, if pulse motor 34 is rotated driving along positive veer, then the relative portion 31 of cutting knife descends, if motor drives along the reverse directions rotation, then the relative portion 31 of cutting knife rises.

If pulse motor 34 is just changeing, then the relative portion 31 of cutting knife overlaps with the point of a knife of cutting knife 32, and then the point of a knife of cutting knife 32 is pushed by the relative portion 31 of cutting knife.Thus, cloth is pushed and is cut off up hill and dale by the relative portion 31 with cutting knife of cutting knife 32.In addition, if formed round-nose button hole on cloth, then pulse motor 4 drives along the reverse directions rotation, and the relative portion 31 of cutting knife rises.If not shown origin position sensor is ON, the relative portion 31 of cutting knife that then continues to rise is that the origin position place stops in the lifting position once more of the relative portion 31 of cutting knife.

As shown in Figure 4, control part 50 is set in Sewing machines 1, it is controlled the action of Sewing machines 1 and the action of cloth cut off device 30.Control part 50 is electrically connected via I/F56 and following part respectively: spindle drive motor drive circuit 51b, and it is used to drive the spindle drive motor 51a of Sewing machines; X-axis motor drive circuit 52b, it is used to drive the X-axis motor 52a that feed mechanism has; Y-axis motor drive circuit 53b, it is used to drive the Y-axis motor 53a that feed mechanism has; Slewing motor drive circuit 54b, it is used for driving makes needle bar 10 and the rotating slewing motor 54a of the looper device 11a of portion; Pulse electric drive circuit 34b, it is used for driving pulse motor 34; Encoder circuit 55b, it is used for the count value of encoder (rotation amount test section) 55 is counted; And guidance panel 57, it imports various operation indications.

In addition, control part 50 has: ROM 50a, and it stores the data of using in various control programs and the program; RAM 50b and EEPROM 50d, the data that its storage is read from ROM 50a, the data that calculate by CPU 50c described later from guidance panel 57 inputs or the data of setting, based on program etc.; And CPU 50c, it carries out the various processing based on program.

Here, control program comprises and is used to carry out the sewing program of making and is used to carry out cloth cut-out program that cloth cuts off etc.

Cloth cut-out program has: detecting pattern, and it is used to detect the position of relative portion 31 of cutting knife and cutting knife 32 coincidences; And the cloth lockout mode, it is used for cutting off based on carrying out cloth by the detected detection position of detecting pattern.

Before detecting pattern is described, at first encoder 55 is described.

For example, drive in pulse motor 34 half step by two-phase, under the situation about driving with the resolution ratio of 400 pulse/commentaries on classics, the encoder 55 that is installed on this pulse motor 34 also uses 400 resolutions.As the A phase output signal of presentation code device 55 and B output signal shown in Figure 5 mutually, in the code device signal suitable with 1 subpulse of pulse motor 34, A phase, B produce rising edge, trailing edge mutually respectively.By this A phase, B phase rising edge, trailing edge are separately counted, thereby the signal value of encoder 55 are counted with 4 multiple.That is, if 1 pulse of pulse motor 34 driven, then encoder 55 counting is 4, under the situation of driven not, produces deviation in the count value of encoder 55.Thus, constitute the rotation amount test section that the rotation amount of paired pulses motor 34 detects.

In Fig. 6, as the characteristic of pulse motor 34, when the difference of input pulse and output pulse is 2 (departure of encoder 55 is 8), reach peak torque, if difference continues to enlarge, then produce imbalance.

In addition,, then can detect in the rotation of this moment pulse motor 55 and produce deviation, promptly detect the coincide point of relative portion 32 of cutting knife and cutting knife 32 if between the testing result of encoder 55 and input pulse, produce deviation.

Utilize above-mentioned principle to realize detecting pattern.In detecting pattern, control part 50 the relative portion 31 of cutting knife from origin position begin with cutting knife 32 near the time, the umber of pulse of paired pulses motor 34 is counted on one side, make pulse motor 34 drive driving shaft 33 and reciprocating mechanism 35 on one side, make the relative portion 32 of cutting knife near cutting knife 31 with the fixing speed rotation.

This near the time, control part 50 makes pulse motor 34 rotate with the speed higher than fixing speed (the 3rd setting speed), till reaching the relative portion 31 of cutting knife and noncontact umber of pulse that cutting knife 32 does not contact, if count value reaches the noncontact umber of pulse, then make pulse motor 34 with fixing speed (than the low speed of the 3rd setting speed) rotation.Here, fixing speed is to make the speed that does not produce deviation between the testing result of the input pulse of pulse motor 34 and encoder 55, is preferably the speed that when contacting with cutting knife 32 in the relative portion 31 of cutting knife both is not damaged.

In addition, if produce deviation between the input pulse from the testing result of encoder 55 and pulse motor 34, then control part 50 stops pulse motor 34, and the count value when simultaneously this being stopped to be stored as the coincidence impulse number.

In the cloth lockout mode, control part 50 the relative portion 31 of cutting knife from origin position to cutting knife 32 near the time, the umber of pulse of paired pulses motor 34 is counted on one side, Yi Bian make pulse motor 34 with (the 1st setting speed) rotation at a high speed, till this count value reaches the coincidence impulse number.Then, make pulse motor 34, reach the predetermined pulse numerical digit until count value from the coincidence impulse number and put with the 2nd setting speed rotation lower than the 1st setting speed.Its result, by driving driving shaft 33 and reciprocating mechanism 35, make the relative portion 32 of cutting knife and cutting knife 31 mutually near and cut off cloth.Here, the predetermined pulse number is meant after the relative portion 31 of cutting knife and cutting knife 32 overlaps, can be to applied the umber of pulse of pressing force till cutting off cloth reliably by the cloth of the two clamping.

Below, the effect of present embodiment is described.

At first, if because of the relative portion 31 of grinding cutting blades, the initial gap between relative portion 31 of cutting knife and the cutting knife 32 is enlarged, then the operator operates guidance panel 57, imports the indication that begins of detecting pattern.

If the input detecting pattern, then as shown in Figure 7, in step S1, control 50 resets to " 0 " with the count value of the umber of pulse of pulse motor 34, begins counting.

In step S2, control part 50 makes pulse motor 34 (the 3rd setting speed: for example 4000pps) rotation at a high speed, reach till the noncontact umber of pulse of importing from guidance panel 57 (for example 1000 pulses) until count value, the relative portion 31 of cutting knife is begun near cutting knife 32 from origin position.Here, count value from 0 till reach the noncontact umber of pulse, there are acceleration region T1, constant speed zone T2 (the 3rd setting speed), the regional T3 that slows down as shown in Figure 8, when becoming the noncontact umber of pulse, are decelerated to low speed (fixing speed: for example 1000pps).In acceleration region T1, with respect to the input pulse number, the testing result of encoder 55 is, departure increases interimly gradually, in the T2 of constant speed zone, this departure is kept the maximum (for example being 8) that does not produce imbalance, and in the regional T3 that slows down, this departure interimly diminishes gradually until being 0.

In step S3, control part 50 is to 1 pulse of pulse motor 34 inputs.

In step S4, control part 50 standbies be equivalent to that the driving of 1 pulse finishes during (1ms), make pulse motor 34 rotations be equivalent to the amount of 1 pulse.

In step S5, control part 50 is based on the testing result of the encoder 55 in the rotation of step S4 drives, and detects the departure between the input pulse of this testing result and pulse motor 34.

In step S6, control part 50 judges whether detected departure is 0 in step S5, is being to jump to step S3 under 0 the situation, and (T4 among Fig. 8) jumps to step S7 under non-0 situation.In addition, under the situation of the operation that repeats this step S3～S6, the rotary speed of pulse motor 34 is maintained low speed.

In step S7, control part 50 stops pulse motor 34, and the count value of this moment is stored as the coincidence impulse number.

In step S8, control part 50 is with high-speed driving pulse motor 34, and relative portion 31 is reset to origin position until cutting knife.Detecting pattern is finished thus.

After detecting pattern was finished, if import the indication that begins that cloth cuts off by the operator on guidance panel 57, then as shown in Figure 9, in step S11, control part 50 reset to 0 with the count value of the umber of pulse of pulse motor 34, begins counting.

In step S12, control part 50 makes pulse motor 34 (the 1st setting speed: for example 4000pps) rotation at a high speed, reaches the coincidence impulse number until count value, thereby makes the relative portion 31 of cutting knife begin with cutting knife 32 approaching from origin position.In the case, count value from 0 till reach the coincidence impulse number, there are acceleration region T5, constant speed zone T6, the regional T7 that slows down as shown in figure 10, when becoming coincidence impulse and count, make pulse motor 34 be decelerated to low speed (the 2nd setting speed: for example 1000pps).

In step S13, control part 50 driving pulse motor 34 become the predetermined pulse number until count value.

In step S14, control part 50 rotation driving pulse motor 34, until the predetermined pulse number, (50ms) standby during before cutting off cloth then.

In step S15, control part 50 makes pulse motor 34 high-speed driving, and relative portion 31 is reset to origin position until cutting knife.The cloth lockout mode finishes thus.

As noted above, according to present embodiment, because when carrying out the cloth lockout mode, pulse motor 34 rotates to by till the detected coincidence impulse number of detecting pattern at a high speed, so the running interval under can increasing at a high speed as far as possible.If this detecting pattern is carried out after the relative portion 31 of grinding cutting blades, even then the interval change because of relative portion 31 of maintenance cutting knife and cutting knife 32 is big, also can suppress the running interval under the low speed as far as possible, shortened circulation timei.

In addition, owing to when carrying out detecting pattern, make pulse motor 34 rotation at a high speed, reach the noncontact umber of pulse, so the time of detecting pattern cost also can shorten until count value.

In addition, the present invention is not limited to above-mentioned embodiment certainly, can suitably change.

For example, in the present embodiment, illustration on straight moving bar 45, the relative portion 31 of cutting knife is set, the situation that cutting knife 32 is set on pedestal part 2 simultaneously describes, but also can on straight moving bar 45 cutting knife be set, and the relative portion of cutting knife is set on pedestal part 2.

In addition, in the above-described embodiment, the operator can be from the 1st setting speed and the 2nd setting speed of the fixing speed of guidance panel 57 input detecting patterns and the 3rd setting speed, cloth lockout mode.

In addition, if constitute that the 2nd setting speed of the fixing speed that makes detecting pattern and cloth lockout mode is consistent, the 3rd setting speed of the 1st setting speed of cloth lockout mode and detecting pattern is consistent, then can simplify from the input operation of guidance panel 57.

In addition, in the above-described embodiment, under the situation of carrying out detecting pattern once more,, carry out detecting pattern, then can realize the shortening of time if utilize the 1st setting speed and the 2nd setting speed of setting before this.

In addition, in the present embodiment, when carrying out detecting pattern, illustration relative portion 31 of cutting knife and cutting knife 32 are directly overlapped situations describe, but also can be inserted with the coincidence position of detecting relative portion 31 of cutting knife and cutting knife 32 under the state of cloth.If overlap the position being inserted with to detect under the state of cloth, then can detect the coincidence position of having considered fabric thickness.Thus, can prevent the imbalance that produces because of the clamping cloth, can cut off reliably.

In addition, in the present embodiment, as rotation amount test section involved in the present invention, illustration encoder 55 describe, but as the rotation amount test section, also can use in addition resolver or tachogenerator etc.

In addition, do not limit the kind of pulse motor, the resolution ratio of its resolution ratio, encoder also all is not limited to 400 resolutions certainly.

In addition, in the present embodiment, when the cloth lockout mode, a reference value that will be used for applying pressing force to cloth limits with umber of pulse (predetermined pulse number), but also can limit with the departure of encoder 55.For example, can be by till arriving the coincidence impulse number from count value and beginning to arrive setting to departure, driving pulse motor 34 applies pressing force to cloth.

In addition, be illustrated carrying out the Sewing machines that round-nose button hole lock seaming makes in the present embodiment, but also can the circular hole lock seaming that does not have straight hole portion make or the Sewing machines that has only the Buttonhole of straight hole portion to make in implement.

Claims (3)

1. the cloth cut off device of a buttonholing machine is characterized in that, has:

Cutting knife (32), it has point of a knife;

The relative portion of cutting knife (31), itself and above-mentioned cutting knife relatively dispose, and cut off cloth with the point of a knife co-operating of above-mentioned cutting knife;

Travel mechanism (35), its with above-mentioned cutting knife or the relative portion of above-mentioned cutting knife in a binding, it is moved up and down;

Driving shaft (33), it rotatably is supported on the sewing machine stand, link with above-mentioned travel mechanism, thus by rotation make above-mentioned cutting knife and above-mentioned cutting knife in portion one with respect to another is approaching/move with leaving;

Pulse motor (34), itself and above-mentioned driving shaft link;

Rotation amount test section (55), it detects the rotation amount of above-mentioned pulse motor; And

Control part (50), it controls above-mentioned pulse motor based on the testing result of above-mentioned rotation amount test section,

Above-mentioned control part can be carried out detecting pattern and cloth lockout mode,

This detecting pattern is, make above-mentioned cutting knife and the relative portion of above-mentioned cutting knife near the time, above-mentioned pulse motor is rotated with fixing speed from origin position, when between from the input pulse of the testing result of above-mentioned rotation amount test section and above-mentioned pulse motor, producing deviation, above-mentioned pulse motor is stopped, the testing result from the rotation amount test section when simultaneously this being stopped is stored as the coincidence impulse number

This cloth lockout mode is, make above-mentioned cutting knife and the relative portion of above-mentioned cutting knife near the time, above-mentioned pulse motor is rotated with the 1st setting speed at a high speed, become above-mentioned coincidence impulse number until testing result from above-mentioned rotation amount test section, make of the 2nd setting speed rotation of above-mentioned pulse motor then, until the testing result from above-mentioned rotation amount test section begins through the predetermined pulse number from above-mentioned coincidence impulse number till with low speed.

2. cloth cut off device according to claim 1 is characterized in that,

Above-mentioned control part is when carrying out above-mentioned detecting pattern, on one side the umber of pulse of above-mentioned pulse motor is counted, make above-mentioned pulse motor with the 3rd setting speed rotation higher on one side than the fixing speed of above-mentioned detecting pattern, become the noncontact umber of pulse that the relative portion with above-mentioned cutting knife of above-mentioned cutting knife does not contact until above-mentioned count value, if above-mentioned count value becomes the noncontact umber of pulse, then make of the fixing speed rotation of above-mentioned pulse motor with above-mentioned detecting pattern, thereby, above-mentioned driving shaft and above-mentioned travel mechanism are driven, make the relative portion of above-mentioned cutting knife approaching with above-mentioned cutting knife, if produce deviation in the testing result from above-mentioned rotation amount test section, above-mentioned pulse motor is stopped, and the count value when simultaneously this being stopped to be stored as the coincidence impulse number.

3. the cloth cut off device of buttonholing machine according to claim 1 and 2 is characterized in that,

The 2nd setting speed of the fixing speed of above-mentioned detecting pattern and above-mentioned cloth lockout mode is consistent, and above-mentioned the 1st setting speed of above-mentioned cloth lockout mode is consistent with the 3rd setting speed of above-mentioned detecting pattern.

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