CN1187487C - Threading regualtor for sewing machine - Google Patents
Threading regualtor for sewing machine Download PDFInfo
- Publication number
- CN1187487C CN1187487C CNB011435690A CN01143569A CN1187487C CN 1187487 C CN1187487 C CN 1187487C CN B011435690 A CNB011435690 A CN B011435690A CN 01143569 A CN01143569 A CN 01143569A CN 1187487 C CN1187487 C CN 1187487C
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- Prior art keywords
- line
- standard grade
- eedle
- tension lever
- reaching
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
- D05B47/04—Automatically-controlled tensioning devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B53/00—Thread- or cord-laying mechanisms; Thread fingers
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning
- D05B63/02—Loop-taker thread take-up levers
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
- D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/30—Details
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention draws out an end of a needle thread to the underside of a fabric by restricting amount of feeding of the needle thread of the first needle stitch by a simple constitution and to avoid to draw out the needle thread when the fabric is taken out by restricting the amount of feeding of the needle thread when a sewing needle is stopped at the top dead point after the thread is cut. A hook 5 is up and down movably disposed on the front HF of the head part H of a sewing machine and after the thread is cut, before the sewing needle 1 moved to the top dead point, the needle thread T is pinched by the top face 5a and a pinching piece 7 by elevating the hook 5. In addition, when operation of the sewing machine is started and a thread take up lever 4 is lowerd once and then it is elevated to reach the top dead point, the hook 5 is lowered.
Description
Technical field:
The present invention relates to a kind of Sewing machines that limits the amount of feeding of reaching the standard grade.
Background technology:
Be well known in the art, when beginning to sew on line end (end of upperthread) seam advance and can make the seam formula totally beautiful below the cloth.
The spy of authorization does not open clear 62-186892 Japanese patent application and has disclosed a kind of Sewing machines as yet, and wherein the amount of feeding of reaching the standard grade by restriction should be gone up line end and moves to below the cloth at the first stitching place.
This Sewing machines has and is arranged on a thread take-up tension lever (thread take-up) bottom, is used to strain the wire clamp of reaching the standard grade between described thread take-up tension lever and the eedle, so when a knife-blade-end that colludes line spare caught on end formed wire loop by reaching the standard grade of drawing of described eedle at the described first stitching place, described wire clamp was just strained described reaching the standard grade.Then, when need just can further not rotating when pulling out described wire loop in the line sending of described eedle tight side by the described line spare that colludes, described end of reaching the standard grade with regard to tensioning to pull out described line end downwards by the pin hole on cloth and the needle plate (throat plate).
Another kind of Sewing machines is by raising presser feet and promoting the processing that eedle (strengthening its stroke) makes things convenient for cloth.More particularly, Sewing machines stops action when finishing trimming and described thread take-up tension lever and be parked in its top dead-centre usually, but at this moment described eedle position is low than its upper dead center position, so described eedle may be met this cloth when processing cloth under presser feet.Therefore Sewing machines go up the axle counter-rotating so that described eedle is lifted to its top dead center from stop position, thereby guarantee to promote described eedle.
Summary of the invention:
In the Sewing machines of above-mentioned first kind of traditional type, the structure that described tension is reached the standard grade is very complicated and cost is also very high.The size of especially described wire clamp must be very little, and is so that itself and the contact area of reaching the standard grade are reduced to minimum, just less to the influence of the quality of linear slit like this.This needs accurate element, so cause equipment cost very high.
This Sewing machines has wire clamp, and the operator must pass line wherein to strain described reaching the standard grade, and this has just reduced the workability of Sewing machines.
In above-mentioned another kind of Sewing machines, owing to make eedle move to described top dead-centre by described counter-rotating of going up axle, thus just reduced the position of described thread take-up tension lever, thus the last LSOR between thread take-up tension lever and the eedle caused.When taking out cloth in this state, relaxed just reach the standard grade and cloth is drawn out together, so the last line end of pulling out from described eedle is always than needed length.
In first kind tradition Sewing machines, when being pulled out below cloth at the first stitching place, last line end also can produce another problem.Because Sewing machines at the first stitching place still with normal speed work, so can't under cloth, pull out the end of reaching the standard grade sometimes.Be that running up of Sewing machines makes eedle move downward fast, this position that causes reaching the standard grade reduces greatly and forcibly pulls out from wire clamp, and the result just can't pull out the described line end of going up under cloth.
Therefore one object of the present invention is to provide a kind of Sewing machines, wherein utilizes the amount of feeding of a last line end of simple structure restriction so that line end is moved to below the cloth on first stitching place handle.
Another object of the present invention is to provide a kind of Sewing machines, and when wherein eedle stopped at top dead-centre after trimming is finished, the amount of feeding of reaching the standard grade by restriction guaranteed that can not pull out this when moving cloth reaches the standard grade.
A further object of the present invention is to provide a kind of Sewing machines, and wherein Sewing machines is at least at the first stitching place low cruise, so as to guarantee this first stitching place on line end move to below the cloth.
Summary of the invention:
In order to address the above problem, the invention provides a kind of last thread control device that is used for Sewing machines.According to a first aspect of the invention, the last thread control device of described Sewing machines comprises a thread take-up tension lever that moves up and down, and this thread take-up tension lever has a through wires hole, goes up reaching the standard grade of drawing the line source from one and passes this through wires hole; Line and the described thread take-up tension lever interlocking of an eedle that moves up and down by pass this eedle pinprick from described thread take-up tension lever.The last thread control device of described Sewing machines comprises that also one is colluded line parts and a drive unit.The described line parts that collude are arranged near the described thread take-up tension lever and can move up and down so that catch on described reaching the standard grade with its upper surface, and this is reached the standard grade and passes described through wires hole in the raised position of its close described thread take-up tension lever top dead-centre.Described drive unit drives the described line parts that collude and moves up and down.
For example, if describedly catch on described reaching the standard grade before colluding the line parts catch on the first stitching place at a knife-edge point that colludes line spare a wire loop, then when the described wire loop that is caught on during around described periphery rotation of colluding line spare, the described tensioning of reaching the standard grade.At this moment, described thread take-up tension lever side is to making the line of described line end side be drawn out for the line quantitative limitation, thereby described line end is moved to below the described cloth.
This lifting is described collude that the simple structure of line parts can be below the described first stitching place pulls out cloth on line end, thereby reduced equipment cost.In addition, only just can catch on the described line end of going up, need not the operator line is passed described wire clamp, thereby improved the workability of Sewing machines with the described upper surface that colludes the line parts.
In addition, for example, if the described line parts that collude caught on described reaching the standard grade before the cloth of finishing trimming takes out under the eedle, then this is reached the standard grade and is not drawn out together with cloth, thereby keeps described eedle place that suitable line length is arranged.
In this structure, select the described line parts that collude are arranged on reach the standard grade for line side relevant with described thread take-up tension lever, but also can be arranged on described eedle side.
According to second aspect present invention, the last thread control device of described Sewing machines also comprises a control device that is used for accessory drive, so that promote the described line parts that collude, thereby catches on described reaching the standard grade under eedle before the cloth that takes out after finishing trimming.
Utilize this structure, can keep described eedle place that suitable line length is arranged.
According to a third aspect of the present invention, the last thread control device of described Sewing machines comprises that also one is colluded line spare and a control device.The described line spare that colludes has a knife-edge point, is used to catch near the wire loop that forms described eedle pinprick, and this colludes line spare and described eedle and described thread take-up tension lever interlocking.Described control device is applicable to the described drive unit of control promoting the described line parts that collude, thereby catches on described reaching the standard grade catch on the wire loop at the first stitching place at described knife-edge point before.
Utilize this structure, described sewing function is moved line end on described below the described cloth at the described first stitching place.
According to a fourth aspect of the present invention, the position of the described upper surface that colludes the line parts that has promoted is than the line hole site on the thread take-up tension lever that is positioned at top dead center lower slightly.
Utilize this structure arrangement, during finishing first stitching, provide on a small quantity and reach the standard grade, thereby prevent that described reaching the standard grade from skidding off or wire jumper takes place from eedle.
According to a fifth aspect of the invention, the present invention first last thread control device of the described Sewing machines of either side in the fourth aspect comprises that being arranged on described of colluding line parts top seizes sheet on both sides by the arms, and this is seized sheet on both sides by the arms and is used for working together with the described upper surface that colludes the line parts that has risen and clamps and catch on described reaching the standard grade.
Utilize this structure, can guarantee described Sewing machines produce as the present invention first to described in the fourth aspect effect.Especially, even catch on described wire loop and utilize the line end be pressed between described presser feet and the cloth described when going up line end and below cloth, pulling out when described knife-edge point, the clamping force that also can guarantee to overcome between presser feet and the cloth is moved line end on described below the cloth to and can not pulled out from described thread take-up tension lever and reach the standard grade.
In order to obtain the described effect of fourth aspect present invention, fifth aspect present invention can be applied in the fourth aspect, it is necessary to collude the line parts and seize sheet on both sides by the arms and be arranged on relevant with described thread take-up tension lever reaching the standard grade for line source one side with described.
According to sixth aspect present invention, the last thread control device of described Sewing machines comprises thread take-up tension lever, eedle, colludes line spare and is used to limit the limiting part of reaching the standard grade, and utilizes the first stitching place that is limited in to reaching the standard grade that last line end is moved to below the cloth.Described Sewing machines also comprises a motor that is used to drive described thread take-up tension lever, eedle and colludes line spare, and a drive current restraint device that is used to limit motor drive current, so that during finishing described first stitching, little by little improve the speed of described Sewing machines at least.
At least the speed of Sewing machines is subjected to the restriction of described drive current device during finishing described first stitching.
Therefore, the downward impulse force of eedle just can be guaranteed the described line end of going up is moved to below the cloth and can not reached the standard grade this and pull out described wire clamp.
Utilize a line hook as limiting part (hereinafter will make an explanation) to this, also can be with wire clamp described in the prior art or like as limiting part.As long as this limiting part can limit this and reach the standard grade so that line end on described is moved to below the cloth at the first stitching place, just can adopt.
Brief Description Of Drawings:
Fig. 1 partly illustrates the head simplified schematic diagram on every side of using Sewing machines of the present invention;
Fig. 2 is according to the diagrammatic side view around the line hook of first embodiment of the invention;
Fig. 3 is a control flow chart of the present invention;
Fig. 4 is the sequential chart according to needle bar of the present invention and thread take-up tension lever motion;
Fig. 5 illustrates described thread take-up tension lever and is positioned at its top dead-centre, and the state of described line hook when being positioned at it and dipping;
Fig. 6 is one group of schematic diagram, illustrates according to thread take-up tension lever of the present invention, eedle and colludes correlation between the line spare;
The normal startup and the acceleration plots of slow start when Fig. 7 shows Sewing machines and starts;
Fig. 8 is a line hook schematic diagram on every side according to a second embodiment of the present invention.
Embodiment describes in detail:
[first embodiment]
As shown in Figure 1, Sewing machines 100 of the present invention has the lathe B that can put cloth, and over against the head H of lathe B.
A pinprick 1a is arranged near the lower end of eedle 1, and the eedle upper end is fixed on the needle bar that can move up and down 2.Lead 3 is installed on the jaw section H A of described head H, and this lead is used for the T that reaches the standard grade is guided to described eedle 1.
Thread take-up tension lever 4 has one and is used to through wires hole 4a that the described T of reaching the standard grade is passed, and this thread take-up tension lever swings up and down around a slotted hole H1, and described slotted hole vertically is arranged on the anterior HF place of described head H and is positioned at the upper right side of described lead 3.The 4a of through wires hole described in Fig. 1 is provided with according to left and right directions (with described slotted hole H1 quadrature).Fig. 1 shows described thread take-up tension lever 4 state at place, dead point thereon.
Seize the top that sheet 7 is arranged on described line hook 5 on both sides by the arms for one, and be operated in the right side clamping of described thread take-up tension lever 4 and catch on the described T of reaching the standard grade at the upper surface 5a of described lifting position with described line hook 5.The setting of this line hook 5 to make the position of its its upper surface 5a when lifting position (shown in solid line) be lower than slightly as described in the position of thread take-up tension lever 4 through wires hole 4a when being positioned at its top dead-centre, and the position of the upper surface 5a of described line hook through wires hole 4a when down position (shown in dotted line) is located to be lower than described thread take-up tension lever 4 slightly and is positioned at its bottom dead centre, thereby avoided line hook 5 to contact with the described T of reaching the standard grade.
Described line hook 5 is formed a grabbing device, line hook 5 or line hook 5 and seize sheet 7 on both sides by the arms and form a restraint device, and described cylinder 6 is formed a drive unit.
Refer again to Fig. 1, a line tension adjuster 8 is installed in the lower right of slotted hole H1, and doing reaches the standard grade supplies the short-term axle of line source to be directed to described thread take-up tension lever 4 from being used as the described T of reaching the standard grade.Described tension regulator 8 makes line T tensioning, thus the line T between elastic threads tension force face 8a and the 8b.
A needle plate 10 has a pin hole 10a who supplies eedle 1 to pass, this needle plate and described lathe B flush, and the cloth (not shown) can be placed on herein.
Though do not illustrate in the drawings, but described Sewing machines also comprises an axle of going up that is driven rotation by sewing electric motor M (see figure 3), one is used to make the needle bar driving mechanism that moved up and down by shaft-driven needle bar 2 on this and one to be used to make the thread take-up tension lever swing mechanism that is swung up and down by shaft-driven thread take-up tension lever on this.Because needle bar 2 and thread take-up tension lever 4 all are of coupled connections with the described axle of going up, so eedle 1 and thread take-up tension lever 4 are interlocked each other.Accommodate among the described lathe B one be arranged on described needle plate 10 belows collude line spare 11 (see figure 6)s, be used for and described eedle 1 cooperates and forms linear slit.This colludes line spare 11 and also is coupling-connected to and describedly goes up axle and by its driving.Therefore, eedle 1, thread take-up tension lever 4 and collude line spare 11 and interlock each other.
Described lathe B also comprises a cutting facility (not shown) that is driven by trimming drive source 21 (see figure 3)s, is used for cutting off after finishing sewing and reaches the standard grade and roll off the production line.
With reference to Fig. 3 control assembly is described below.
Form control device C by a Sewing machines controller 15 and an electric machine controller 16.Described Sewing machines controller 15 and electric machine controller 16 comprise CPU (center processing unit), ROM (read-only storage), RAM (random access memory) and I/O interface.
Storage is used to operate the control program and the control data of Sewing machines among the ROM of described Sewing machines controller 15, and in RAM, store tradable or temporary transient data, thereby provide command signal to described electric machine controller 16 with the various device that is connected by the I/O interface according to control program.
The importation of described Sewing machines controller 15 connects an eedle position detector and a pedal sensor 18.
Detect the nearly top dead-centre and the nearly bottom dead centre of eedle 1 in the each rotation of described eedle position detector 17 axle on described, so that provide detection signal (going up the pin signal, following pin signal) for described Sewing machines controller 15 and electric machine controller 16.The stitching number is followed successively by 0,0.5 when whenever finishing half stitching, and 1.0... can show the position of described eedle thus.
Described pedal sensor 18 is installed on the pedal (not shown), and described sensor can transmit " an opening " signal to described Sewing machines controller 15 when operating this pedal with convenient user.
The output of Sewing machines controller 15 connects an electromagnetic valve 19 and a driver 20.Electromagnetic valve 19 is connected with described cylinder 6.The signal that Sewing machines controller 15 sends is opened electromagnetic valve 19, then described cylinder tie rod 6a indentation in described cylinder 6 stretch out, thereby make described line hook 5 move up and down.Described driver 20 connects the trimming drive source 21 by its driving.
Described electric machine controller 16 is connected with described controller 15, and stores a plurality of current values of the described sewing electric motor M drive current of representative in its ROM.
The importation of controller 16 also is connected with described eedle position detector 17, motor phase detector 22 and motor speed detector 23.Described detector 17 is passed to described controller 16 with the last pin and the following pin signal that are produced.Described motor phase detector 22 is to described controller 16 output phase signals, and reception is by being installed in the described pulse signal of going up an encoder output on the axle.Described motor speed detector 23 is to described controller 16 transfer rate signals, and reception is by the pulse signal of above-mentioned encoder output.
The output of controller 16 is connected with a motor driver 25 with a D/A converter 24.D/A converter 24 converts the current value signal of controller 16 outputs to analog signal, and this signal is delivered to a comparator 26, and described current value signal produces according to described control program.Described comparator 26 compares by the current value of converter 24 outputs and the current of electric detected value of being exported by motor driver 25, and provides driving current value so that described detected value is no more than given current value to driver 25.
Described motor driver 25 provides drive current according to the direction of rotation signal from the driving current value of comparator 26, pulsewidth modulation (PWM) signal that is used for motor drive current control and controller 16 outputs to described motor M.Pwm signal calculates with the following method, and promptly the measured velocity value exported of the command speed value that multiply by controller 15 output with a given gain and described speed detector 23 is poor.
The course of work of described Sewing machines is described with reference to Fig. 4 to 7 below.
When after described phase detectors 22 are finished trimming, detecting the position of rotation corresponding to the motor M of described thread take-up tension lever 4 upper dead center positions, Sewing machines just shuts down, and be that described motor is removed and encouraged (see figure 5) by controller 16 under the control of described controller 15 simultaneously.
Then, controller 15 drives cylinder 6 by electromagnetic valve 19, makes described connecting rod 6a pull out so that described line hook 5 is lifted to its lifting position, and described thus upper surface 5a utilizes the described sheet 7 of seizing on both sides by the arms to strain and catch on the described T of reaching the standard grade (shown in Fig. 6 (b)).
Then, shown in Fig. 6 (a), motor M during reversing reverse rotation so that described needle bar 2 is moved to described top dead-centre, thereby be convenient to take out cloth, and Sewing machines shuts down between down period up to stepping on pedal.When cloth when eedle shifts out for 1 time seize on both sides by the arms between sheet 7 and the described upper surface 5a and can't move because the T that reaches the standard grade is sandwiched in, so the T that reaches the standard grade can not be drawn out together with described cloth, the result just remains suitable line length at eedle 1 place.
After this, when stepping on pedal, pedal sensor 18 sends " an opening " signal to controller 15, starts Sewing machines by controller 16 drive motors M thus, so Sewing machines is transformed into an action cycle.
More particularly, when the Sewing machines entry into service, eedle 1 descends, and thread take-up tension lever 4 rises to upper dead center position, shown in Fig. 6 (b).Then, shown in Fig. 6 (c), eedle 1 arrives lower dead point position, and thread take-up tension lever 4 moves downward simultaneously.At this moment,, the T that reaches the standard grade seizes on both sides by the arms between sheet 7 and the upper surface 5a, so it keeps tensioning state because still being stuck in.And, because it is lower than the position of top dead center through wires hole 4a at the described upper surface 5a of lifting position, therefore when thread take-up tension lever 4 when upper dead center position moves downward, length is that the T that reaches the standard grade of the difference of above-mentioned both heights just passes eedle 1, thus having prevented to reach the standard grade deviates from from eedle 1 or wire jumper takes place.
Next, shown in Fig. 6 (d), eedle 1 form a wire loop L near the top of eedle 1, and this wire loop is hooked by knife-edge point 11a when bottom dead centre moves upward.When described when colluding line spare 11 and in described wire loop L, rotating again, will widen described wire loop, because line hook 5 and seize between the sheet 7 T that reaches the standard grade of tension constantly on both sides by the arms, can not draw in line so collude line spare 11 in eedle 1 one sides, but draw in described end of reaching the standard grade so that the described line end TE of going up is moved under cloth and the pin hole 10a, shown in Fig. 6 (e).
Then, eedle 1 moves to described upper dead center position again, and shown in Fig. 6 (a), described thread take-up tension lever 4 moves to described upper dead center position simultaneously, shown in Fig. 6 (b).When detecting the top dead-centre of thread take-up tension lever 4, described cylinder tie rod 6a stretches out to reduce described line hook 5, as shown in Figure 5.Because after thread take-up tension lever 4 is in upper dead center position, described line hook 5 just reduces, and the T that reaches the standard grade can not relax, so bump less than the parts around the thread take-up tension lever 4.
According to Sewing machines of the present invention, machine is moved line end on described below the cloth to guaranteeing with microrunning during starting Sewing machines and reducing line hook 5.This slow start-up control will hereinafter be described.
When the user steps on pedal, pedal sensor 18 will " be opened " signal and pass to controller 15 with order motor drive controller 16 output signals.This electric machine controller 16 is selected a restriction current value and is carried out described slow start-up control from previously stored a plurality of current values, and this restriction electric current is delivered to D/A converter 24, and this converter is to the analog signal of comparator 26 outputs after conversion.The comparator 26 relatively current of electric detected value of motor driver 25 outputs transmits the restriction current value of driving current signal with being used for to driver 25, thereby guarantees that described detected value is no more than described restriction current value.
When counting to 1.0 (after the Sewing machines startup by the stitching that detection signal calculated of eedle position detector 17 outputs, when eedle 1 during to lower dead point position stitch be 0.5, when eedle 1 during to upper dead center position stitch be 1.0), and when described phase detectors 22 detect thread take-up tension lever 4 and are positioned at top dead-centre, electric machine controller 16 is selected a normal electrical flow valuve and by D/A converter 24 analog signal of this electric current is imported described comparator 26 from different current values, the described normal electrical flow valuve of normal acceleration that is used for is greater than the restriction current value in order to slow start-up control.
As a result, Sewing machines quickens under normal motor control, and removes the restriction to electric current.
In Fig. 7, ordinate is represented rotating speed of motor, and abscissa is represented the time.Therefore, the slope of curve is represented amount of acceleration.Curve shown in the dotted line is the accelerating curve under the normal motor control, is the accelerating curve under the restriction current status shown in the solid line.
In above-mentioned first embodiment, finish before the time that promotes line hook 5 behind the trimming is set to Sewing machines and stops rear motor M counter-rotating, but be not limited to this situation, just passable before cloth is taken out from eedle 1 bottom as long as this time was set at after the above-mentioned time.Yet,, just can guarantee that tension reaches the standard grade if should as present embodiment, be set in Sewing machines the time when stopping.
In the present embodiment, Sewing machines withholding period top-stitching hook 5 still remains on lifting position and pulls out to prevent that handle is reached the standard grade when taking out cloth, can easily make to reach the standard grade simultaneously to remain on the first stitching place.But, as long as after cloth has taken out, also can reduce line hook 5.Yet, before reaching the standard grade below first stitching is moved cloth to, be necessary to make the T that reaches the standard grade to remain on lifting position.But,, what for be put into the eedle bottom to piece of cloth material instantly, also can prevent because misoperation and the T that will reach the standard grade pulls out if the T that reaches the standard grade as present embodiment is tightened up at the Sewing machines stopping period.
First embodiment adopts and to seize sheet 7 on both sides by the arms with the line hook 5 tension T that reaches the standard grade that works.But, also may only need not seize sheet 7 on both sides by the arms and just the T that reaches the standard grade can be tightened to a certain degree with line hook 5.For example, if cloth is very thin, then only just be enough to strain the T that reaches the standard grade, because line tension is also not really strong when taking out cloth with line hook 5.Also the part that contacts with the T that reaches the standard grade on the online hook 5 of possibility uses the material with great friction coefficient so that increase tightening force when only using line hook 5.
As for the time of reducing line hook 5, first embodiment regulation is when thread take-up tension lever 4 arrives upper dead center positions after eedle 1 is finished the circulation that moves up and down, but, as long as can also be not limited to the above-mentioned time by the first stitching place that is limited in that reaches the standard grade is moved to below the cloth reaching the standard grade.
Among first embodiment, in droop line hook 5, also remove restriction to motor drive current.But, for example also can be online hook 5 descend and remove described restriction again after finishing.
[second embodiment]
Below with reference to Fig. 8 the second embodiment of the present invention is described.
Slightly different in the operation of the online hook of the second enforcement side and the relative configuration with first embodiment.Following explanation only limits to the part different with first embodiment.
The middle part of a roughly L-shaped line hook 50 is supported among the joint H and 51 swings around the shaft.One side of line hook 50 be used to strain reach the standard grade T collude line part 52, this part can be around described rotating shaft 51 swing between lifting position (among the figure shown in the solid line) and down position (among the figure shown in the double dot dash line).Collude line part 52 and stretch out at described lifting position slave head surface HF, and in down position withdrawal head H.At this, head surface HF be provided with one for the used slotted hole H1 of thread take-up tension lever 4 and one on its right side (line tension adjuster 8 sides) and slotted hole H3 in parallel.Colluding line part 52 can be along stretching out among the slotted hole H3 slave head surface HF.
The position of the upper surface 50a of line hook 50 line hole 4a when described raised position is lower than slightly that thread take-up tension lever 4 is at described upper dead center position among first embodiment.
The end of line hook 50 opposite sides and the connecting rod 60a as the cylinder 60 of drive unit rotatably link together.The withdrawal of connecting rod 60a/stretch out motion the described line part 52 of colluding is moved up and down.
Be installed with one on slotted hole H3 top and seize sheet 70 on both sides by the arms, be used for when upper surface 5a is in lifting position, strains and catching on the T that reaches the standard grade.
The mode of operation of second embodiment is described now.During beginning, collude line part 52 and be in and dip, and cylinder tie rod 60a is in the state of stretching out.When bar 60a withdrew, line hook 50 was just around axle 51 swings.This move makes that collude line part 52 moves to lifting position with tension with catch on surperficial 50a and seize the T that reaches the standard grade between the sheet 70 on both sides by the arms.
In the present embodiment promptly or identical among the time that discharges the T that reaches the standard grade and first embodiment, so repeat no more.
In the present embodiment, line hook 50 comprises that one is colluded line parts, colluding line parts 50 or a pair ofly collude line parts 50 and seize sheet 70 on both sides by the arms and as the cylinder 60 of drive unit as limiting part.
Should be appreciated that to the invention is not restricted to the foregoing description, in spirit and scope of the invention, various variations and change can also be arranged.
According to a first aspect of the invention, the simple structure of only utilizing lifting to collude the line parts just can be pulled out below cloth reaching the standard grade at the first stitching place, thereby has reduced equipment cost.In addition, strain to reach the standard grade and make that the operator need not to penetrate in the wire clamp reaching the standard grade with the described line parts upper surface that colludes, thereby improved the workability of Sewing machines.
According to a second aspect of the invention, can remain on the eedle place suitable line length is arranged all the time.
According to a third aspect of the invention we, this kind Sewing machines can be moved to below the cloth by line end on first stitching place handle.
According to a forth aspect of the invention, during first stitching, only supply with and reach the standard grade on a small quantity to prevent reach the standard grade slippage or wire jumper.
According to a fifth aspect of the invention, this kind Sewing machines can guarantee to have the described effect in the present invention first to fourth aspect.Particularly can guarantee to overcome thrust between presser feet and the cloth and will reach the standard grade and move to below the cloth, and can from thread take-up tension lever, not pull out described reaching the standard grade.
According to a sixth aspect of the invention, the downward active force of eedle can be guaranteed to move to below the cloth reaching the standard grade and can not pull out from wire clamp and reach the standard grade.
Claims (6)
1. last thread control device that is used for Sewing machines comprises: a thread take-up tension lever that moves up and down, this thread take-up tension lever have one, and the through wires hole of reaching the standard grade and passing of reaching the standard grade and providing for line source is provided; An eedle that moves up and down, this eedle by from described thread take-up tension lever and reaching the standard grade of passing this eedle pinprick and described thread take-up tension lever interlocking, it is characterized in that described Sewing machines also comprises:
One is colluded the line parts near what described thread take-up tension lever was installed, and these parts move up and down and pass reaching the standard grade of described through wires hole so that catch on its upper surface in its raised position near described thread take-up tension lever top dead-centre; With
One is used to drive the described drive unit that the line parts move up and down that colludes.
2. the thread control device of going up as claimed in claim 1 is characterized in that also comprising: be used to control the control device of a drive unit, so that promote the described line parts that collude, collude tight described reaching the standard grade under described eedle after the cloth of finishing trimming takes out.
3. the thread control device of going up as claimed in claim 1 is characterized in that also comprising:
The line spare that colludes with knife-edge point is used to catch on the wire loop that forms around the eedle pinprick, and interlocks with described eedle and thread take-up tension lever; With
Be applicable to the control device of the described drive unit of control, describedly collude the line parts and o'clock before the first stitching place catches on described wire loop, collude tight described reaching the standard grade in described knife-edge so that promote.
4. the thread control device of going up as claimed in claim 3, the position of the wherein said upper surface that colludes the line parts that has risen is lower than the position of described thread take-up tension lever its through wires hole when top dead-centre slightly.
5. last thread control device according to any one of claims 1 to 4, it is characterized in that described Sewing machines comprises that also is positioned at the described sheet of seizing on both sides by the arms that colludes line parts tops, so that strain and catch on described reaching the standard grade with the described upper surface that colludes the line parts that has risen.
6. a last thread control device that is used for Sewing machines comprises;
Thread take-up tension lever with through wires hole, this line hole are used to make reach the standard grade and pass for reaching the standard grade of providing of line source;
An eedle that moves up and down, this eedle by from described thread take-up tension lever and reaching the standard grade of passing this eedle pinprick and described thread take-up tension lever interlocking;
The line spare that colludes with knife-edge point, be used to catch near the eedle pinprick, form wire loop and with described eedle and thread take-up tension lever interlocking; With
Be used to limit the restraint device of reaching the standard grade, described Sewing machines is by means of to described restriction of reaching the standard grade, and at the first stitching place line end on described moved to below the cloth, and this Sewing machines also comprises:
A motor that is used to drive described thread take-up tension lever, eedle and colludes line spare; With
Be used to limit the drive current restraint device of motor drive current, so that increase the sewing velocity of described Sewing machines gradually, till this acceleration lasts till at least below the first stitching place moves line end on described to cloth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP378523/2000 | 2000-12-13 | ||
| JP2000378523A JP2002177678A (en) | 2000-12-13 | 2000-12-13 | Sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1358895A CN1358895A (en) | 2002-07-17 |
| CN1187487C true CN1187487C (en) | 2005-02-02 |
Family
ID=18847077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011435690A Expired - Fee Related CN1187487C (en) | 2000-12-13 | 2001-12-13 | Threading regualtor for sewing machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2002177678A (en) |
| KR (1) | KR20020048867A (en) |
| CN (1) | CN1187487C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503804B (en) * | 2008-12-15 | 2010-12-08 | 中国石油化工股份有限公司 | Cleaning liquid composition and use thereof |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4094867B2 (en) * | 2002-02-20 | 2008-06-04 | Ｊｕｋｉ株式会社 | sewing machine |
| JP2009050364A (en) * | 2007-08-24 | 2009-03-12 | Juki Corp | Sewing machine control method |
| CN101139786B (en) * | 2007-09-13 | 2013-02-13 | 启翔针车（上海）有限公司 | Thread holding device of sewing machine |
| JP5427438B2 (en) * | 2009-02-27 | 2014-02-26 | Ｊｕｋｉ株式会社 | sewing machine |
| CN104120560B (en) * | 2013-04-23 | 2018-02-13 | Juki株式会社 | The control method of sewing machine |
| CN105780324B (en) * | 2016-05-19 | 2018-06-29 | 拓卡奔马机电科技有限公司 | Use in sewing machine supplies line mechanism and sewing machine |
| CN111379080B (en) * | 2018-12-30 | 2021-10-29 | 浙江中捷缝纫科技有限公司 | Control method and device for thread cutting of sewing machine, storage medium and processor |
| CN109706642B (en) * | 2019-02-27 | 2021-03-12 | 杰克缝纫机股份有限公司 | Control mechanism for eliminating needle thread on fabric and sewing machine |
| CN112195579B (en) * | 2020-09-11 | 2022-05-24 | 浙江镨美科智能刺绣设备有限公司 | Presser foot height self-adaptive adjusting method |
-
2000
- 2000-12-13 JP JP2000378523A patent/JP2002177678A/en active Pending
-
2001
- 2001-12-13 KR KR1020010078875A patent/KR20020048867A/en not_active Application Discontinuation
- 2001-12-13 CN CNB011435690A patent/CN1187487C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503804B (en) * | 2008-12-15 | 2010-12-08 | 中国石油化工股份有限公司 | Cleaning liquid composition and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1358895A (en) | 2002-07-17 |
| JP2002177678A (en) | 2002-06-25 |
| KR20020048867A (en) | 2002-06-24 |
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