CN101270537A - Apparatus for adjusting timing of needle and looptaker of sewing machine - Google Patents
Apparatus for adjusting timing of needle and looptaker of sewing machine Download PDFInfo
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- CN101270537A CN101270537A CNA2008100851821A CN200810085182A CN101270537A CN 101270537 A CN101270537 A CN 101270537A CN A2008100851821 A CNA2008100851821 A CN A2008100851821A CN 200810085182 A CN200810085182 A CN 200810085182A CN 101270537 A CN101270537 A CN 101270537A
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- eedle
- shuttle
- belt pulley
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- 238000009958 sewing Methods 0.000 title claims abstract description 35
- 230000009467 reduction Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 description 17
- 230000001105 regulatory effect Effects 0.000 description 12
- 230000008859 change Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 238000009940 knitting Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
An apparatus for adjusting a timing of a needle and a looptaker of a sewing machine provided at a zigzag sewing machine having an upper shaft for driving a needle bar, a lower shaft for driving a looptaker, a machine frame, and a timing belt for connecting and synchronizing the shafts includes a cam member including a first cam surface and a second cam surface, a first arm member and a second arm member supported by the machine frame and a first pulley and a second pulley mounted to the first arm member and the second arm member respectively and always contacting the timing belt, the first pulley following the first cam surface and the second pulley following the second cam surface.
Description
Technical field
Present invention relates in general to the equipment of the timing of a kind of eedle that is used to regulate Sewing machines and shuttle, it regulates the hook of the shuttle in Sewing machines and the timing that eedle meets.
Background technology
Disclosed traditional Sewing machines comprises the lower shaft of going up axle and driving shuttle that drives shank among the JP49-110450A.Last axle is connected to and is used for horizontal mobile shank arm to control the device of tortuous seam width.The equipment that is used to regulate the timing of eedle and shuttle is arranged between lower shaft and the shuttle (shuttle axle).Lower shaft is connected with belt by belt pulley with the shuttle axle, thereby via belt the rotation of lower shaft is delivered to the shuttle axle.Belt contacts with four regulating wheels, promptly contacts with two regulating wheel unit.Disclosed Sewing machines comprises two regulating wheel unit among the JP49-110450A.The regulating wheel unit is connected to the device that is used to control tortuous seam width via the helical gear simple gears of employing mechanism.Driving force is delivered to the regulating wheel unit via gear mechanism from the device that is used to control tortuous seam width, thereby the collaborative device that is used to control tortuous seam width in two regulating wheel unit is operated together simultaneously.Belt tension changes when the regulating wheel unit operations, therefore uneven rotation is passed to the shuttle axle.
Yet, in above-mentioned Sewing machines,, present non-constant state so connect the tension force of the belt of lower shaft and shuttle axle because two regulating wheel unit are operated simultaneously by the helical gear simple gears of employing mechanism.
Non-constant belt tension--when for example being in high-tension or low-tension--may cause to be gone up the moment of torsion difference between axle and the lower shaft and/or causes noise and vibration.
In addition, unexpected variation can appear in the rotating speed of shuttle.Therefore, the shuttle change in rotational speed can't be followed the laterally mobile of shank arm (that is, shank and eedle), the delay that--is the hook of shuttle and the timing that eedle meets--so cause the timing of eedle and shuttle.The delay of this timing causes bouncing pilotage.
In addition, lax belt causes " jumping tooth ", and " jumping tooth " can cause the delay of presetting the benchmark timing between lower shaft and the shuttle axle.This delay also may cause bouncing pilotage.
As mentioned above, when belt tension is non-constant with respect to the shuttle rotating speed, can't guarantee the steady running of Sewing machines.
Therefore need the equipment of the timing of a kind of eedle that be used to regulate Sewing machines and shuttle, it is not subjected to above-mentioned defect influence.
Summary of the invention
The purpose of this invention is to provide a kind of equipment of timing that is used to regulate the eedle of Sewing machines and shuttle that is not subjected to above-mentioned defective effect.
According to aspects of the present invention, a kind of equipment that is arranged on the timing of the eedle that is used to regulate Sewing machines on the Zigzag sewing machine and shuttle, described Zigzag sewing machine has: go up axle, it is used to drive the shank that keeps eedle; Lower shaft, it is used to drive shuttle; Frame, it is used for supporting axle and lower shaft in the mode that can rotate; And Timing Belt, it is used to connect axle and lower shaft and makes them synchronous.The equipment of the timing of described eedle that is used to regulate Sewing machines and shuttle comprises: cam member, and it comprises first cam surface and second cam surface and is rotated by driving force; The first arm member and second arm member are supported in the mode that can rotate by frame respectively; And first belt pulley and second belt pulley, they are respectively installed to the first arm member with second arm member and contact with Timing Belt all the time, and first belt pulley is driven in first cam surface and second belt pulley is driven in second cam surface.
Utilize said structure, because one in the first arm member and second arm member is driven in first cam surface, and another in the first arm member and second arm member is driven in second cam surface, and therefore each the driven amount of exercise with respect to the cam member corner is subjected to independently controlling.Therefore, by first cam surface and second cam surface are provided with suitable outline (that is, cam contour) respectively, make that the tension force of Timing Belt is constant with respect to the rotating speed maintenance of shuttle.By keeping the constant tension of Timing Belt, prevented that the accident of shuttle rotating speed from changing.In addition, the timing of eedle and shuttle is set for best satisfying the knitting position of eedle all the time, thereby prevents the generation of bouncing pilotage.In addition, the torque that acts on axle and lower shaft keeps constant, therefore guarantees the stable operation of Sewing machines under noiseless or vibration situation.
According to a further aspect in the invention, cam member drives by stepper motor.
Therefore, irrelevant with the rotating speed of last axle or lower shaft, the rotating speed of shuttle can carry out freely controlling.
According to a further aspect in the invention, the first arm member and second arm member are supported by rack-mounted concentric shafts.
Therefore, the quantity of part reduces, and the structure that is used to support the first arm member and second arm member is compared by the situation of independent support with second arm member with the first arm member and simplified.
According to a further aspect in the invention, cam member, the first arm member and second arm member are assembled on the carriage, and carriage relatively rotates with the position of bracket with respect to frame around axle with respect to frame when assembling.
Therefore, when one of the first arm member and second arm member with respect to axle for example regulate in positive direction+during α, by with respect to axle the negative direction rotating bracket for example-α/2, first belt pulley and second belt pulley set are dressed up and are made them take turns (promptly with respect to first Timing Belt of axle on being connected under middle lopping situation, than the Timing Belt of minor diameter wheel) center and the setting that is mutually symmetrical of the virtual line (that is straight line) at center that is installed to second Timing Belt wheel of lower shaft.Therefore, under the situation of left side lopping (promptly, eedle forms under the situation of coil in leftward position) and under the situation of right side lopping (that is, eedle forms under the situation of coil in right positions), the length of Timing Belt is consistent between the left side of its annular and right side.This has solved when first belt pulley and second pulley movements because tensioning repeatedly/caused for example durability of lax Timing Belt descends or the problem of generation noise.
According to the present invention, by being arranged on the arcuate socket on the frame and passing the screw that arcuate socket is threaded onto in the carriage and realize described relatively rotating.
According to a further aspect in the invention, cam member comprises dish, and first cam surface and second cam surface are arranged on the outer surface of dish.
According to a further aspect in the invention, first cam surface and second cam surface are arranged to adjacent one another are.
According to a further aspect in the invention, Timing Belt is arranged between first belt pulley and second belt pulley, and in response to laterally moving of shank, another reduction when an increase in first belt pulley and second belt pulley is applied to the tension force of Timing Belt in first belt pulley and second belt pulley is applied to the tension force of Timing Belt, and another increase in first belt pulley and second belt pulley is applied to the tension force of Timing Belt when a reduction in first belt pulley and second belt pulley is applied to the tension force of Timing Belt.
Description of drawings
By detailed description with reference to the accompanying drawings, aforementioned and extra feature of the present invention and characteristics will become more obvious, wherein:
Fig. 1 is the front view according to the Sewing machines of first embodiment of the invention;
Fig. 2 is the side view according to the Sewing machines of first embodiment of the invention;
Fig. 3 is that it illustrates the major part relevant with straining pulley along the cross-sectional view of the line III-III among Fig. 1;
Fig. 4 is the three-dimensional exploded view of the major part relevant with straining pulley;
Fig. 5 is the enlarged drawing that is oppositely arranged that illustrates about the hook of the eedle of prior art and shuttle;
Fig. 6 is the enlarged drawing that is oppositely arranged that illustrates about the hook of the eedle of prior art and shuttle;
Fig. 7 is the enlarged drawing that is oppositely arranged that illustrates according to the hook of the eedle of embodiment of the present invention and shuttle;
Fig. 8 schematically illustrates the operation of embodiment of the present invention by the motion that Timing Belt and belt pulley are shown;
Fig. 9 is the overlapped view of three kinds of situations shown in Fig. 8;
Figure 10 is the side view according to the Sewing machines of second embodiment of the invention, and wherein carriage is installed in it can be swayed to be used for adjusting part with respect to frame;
Figure 11 is the figure that explains the motion of Timing Belt when coming the position of adjustment cam slave arm and straining pulley carriage by means of screw bolt and belt pulley;
Figure 12 is the right view of closed-loop shaped Timing Belt, illustrates its length variations; And
The figure of the motion of Timing Belt and straining pulley when Figure 13 is the established angle of explaining when bracket.
The specific embodiment
First embodiment of the present invention is described below with reference to the accompanying drawings.As depicted in figs. 1 and 2, the Sewing machines according to present embodiment comprises shell 1 and frame 2.Last axle 3 is supported in the mode that can rotate by the pair of bearings 4,4 that is fixed on frame 2.Handwheel 5 and belt pulley 6 are fixedly mounted in an end of going up axle 3.Belt pulley 6 comprises larger-diameter driven pulley 6a and takes turns 6b (that is first Timing Belt wheel) than the Timing Belt of minor diameter.Drive motors 9 is installed to frame 2, thereby and motor pulley 8 be fixedly secured on the output shaft of drive motors 9 and rotate.Jointless closed-loop shaped driving belt 7 is coupled to motor pulley 8 and driven pulley 6a, thereby the rotation of the axle of drive motors 9 reduced and is delivered to spools 3.According to routine, needle bar crank 10 is fixed to the other end of axle 3, thereby shank 12 carries out vertical reciprocating motion by means of toggle-action lever 11.Eedle 13--promptly is used to form the suture needle of coil--be fixedly mounted in the lower end of shank 12 by eedle folder 14.According to routine, thereby supporting in the vertical direction by shank arm 16, shank 12 slides, laterally mobile thereby shank arm 16 is supported by axle 15.Therefore, shank 12 reciprocating motion vertically simultaneously, is laterally moved with respect to axle 15.Lower shaft 17 supports in the mode that can rotate by the bearing 18 and 19 that is fixed to frame 2 separately.Timing Belt wheel 20 (that is second Timing Belt wheel) is used for rotating by means of the end that hold-down screw 21 is fixedly secured to lower shaft 17.Second Timing Belt wheel, 20 and first Timing Belt wheel 6b is arranged to have the identical number of teeth.Helical gear is fixedly mounted on the other end of lower shaft 17.Therefore, when lower shaft 17 rotations, shuttle 50 (referring to Fig. 5 to Fig. 7) rotates around fixed axis with the rotating speed that doubles lower shaft 17.Jointless closed-loop shaped Timing Belt 22 is coupled to first Timing Belt wheel 6b and second Timing Belt wheel 20, thereby is making axle 3 rotate with identical speed with lower shaft 17 under the situation of normal running.Straining pulley 23 and straining pulley 24 are (promptly, as first belt pulley and second belt pulley) be arranged between first Timing Belt wheel 6b and second Timing Belt wheel 20 and more close second Timing Belt wheel 20, make straining pulley 23 and straining pulley 24 Timing Belt is clipped in the middle from the outside of Timing Belt.
On the close frame 2 of Timing Belt 22, axle 25 is arranged to outstanding between first Timing Belt wheel 6b and second Timing Belt wheel 20 basically.Straining pulley carriage 26 (that is, as the first arm member) has the general triangular shape, and it comprises the lining 27 and spools 28 that is separately positioned on angle and base angle it in outstanding mode.Axle 25 is engaged in the lining 27, and straining pulley 23 cooperates in the mode that can rotate around axle 28.The residual angle of straining pulley carriage 26 bends to the right angle and is provided with internal thread 26a, and screw bolt 29 is screwed among the internal thread 26a and is fastening by nut 30.The upper bend of straining pulley carriage 31 (that is, as second arm member) becomes to have inverted U-shaped vertical cross section, and porose 31a and hole 31a are set, and hole 31a and hole 31a are engaged in the external surface peripheral of lining 27 in the mode that can rotate.Axle 32 is arranged in the bottom of straining pulley carriage 31 and gives prominence to.Straining pulley 24 cooperates in the mode that can rotate around axle 32.In the approximate center of straining pulley carriage 31 pin 33 being set makes it outstanding along the direction opposite with axle 32.Straining pulley carriage 26 and straining pulley carriage 31 are by frame 2 coaxial supports.Similar with straining pulley carriage 31, the upper bend of cam follower arm 34 becomes inverted U-shaped horizontal section, and comprises hole 34b and 34b that the outer surface around lining 27 cooperates in the mode that can rotate.In addition, cam follower arm 34 is arranged such that inverted U-shaped the U-shaped portion with cam follower arm 34 of straining pulley carriage 31 is clipped in the middle.For the smooth operation of cam follower arm 34, be provided with pad 36.Pin 35 and protuberance 34a are arranged on the bottom of cam follower arm 34.Straining pulley carriage 26, straining pulley carriage 31 and cam follower arm 34 rotate around the axle 25 that is arranged on the frame 2 respectively.Straining pulley carriage 26, straining pulley carriage 31 and cam follower arm 34 lock in the axial direction by back-up ring 37.Stepper motor 38 is installed to carriage 39 by means of screw 40 and 40.Then, carriage 39 is installed to frame 2 by means of screw 41 and 41.Cam 42 (promptly, as cam member) be to have two independently cam surface 42a and 42b be (promptly, as first cam surface and second cam surface) disc cam, two cam surfaces basically about vertical axis with respect to stepper motor 38 rotating shaft 38a symmetries, and rotating shaft 38a securely is coupled in the cam 42.The pin 35 of cam surface 42a contact cam follower arm 34.The pin 33 of cam surface 42b contact straining pulley carriage 31.In addition, screw in the protuberance 34a of the end contact cam follower arm 34 of the screw bolt 29 in the straining pulley carriage 26.Therefore, when stepper motor 38 rotation, when from Fig. 2 top view, straining pulley 23 and straining pulley 24 are with respect to axle 25 left or move right.Stepper motor 38 is operated based on various information under computer control, and described information comprises rotation, the horizontal amount of movement of shank arm 16, the type of line and the type of fabric of axle 3.
Among Fig. 1, pinion 44 is installed to the axle of the stepper motor 43 of the horizontal amount of movement that is used to control shank arm 16, and with the sector gear 45a engagement of actuating arm 45.Actuating arm 45 is connected to bar 46, and bar 46 is connected to the bottom of shank arm 16.Therefore, the rotational motion of stepper motor 43 is delivered to shank arm 16, thereby eedle 13 is laterally moved.
In the present embodiment, cam 42 is driven by stepper motor 38, yet cam 42 also can mechanically drive.That is, cam 42 can be activated by the cam that produces zigzag pattern via chain link or gear.When cam 42 was driven by stepper motor 38, the rotating speed of shuttle 50 was freely to control, and is irrelevant with the rotating speed of last axle 2 or lower shaft 17, and this allows the rotating speed of shuttle 50 to carry out appropriate change according to the type of fabric.
Next, the operation of present embodiment is described.
The rotation of the axle of drive motors 9 is reduced to about nine/in the lump and is delivered to axle 3.By being attached to axle 3 needle bar crank 10 regularly rotational motion is transformed into reciprocating motion, thus, shank 12 is via toggle-action lever 11 reciprocating motion vertically.When shank 12 reciprocating motions, be fixedly secured to the also reciprocating motion vertically of eedle 13 of shank 12 lower ends by means of eedle folder 14.On the other hand, first Timing Belt wheel 6b that is fixedly secured to an axle end of 3 rotates second Timing Belt wheel 20 via Timing Belt 22 with 1: 1 speed ratio, so lower shaft 17 also rotates with second Timing Belt wheel 20.The rotation of lower shaft 17 doubles by oblique gear mechanism and shuttle 50 is rotated.Stepper motor 43 under computer control with on axle 3 rotational synchronization ground rotate, so eedle 13 laterally moves via bar 46.
As shown in Figure 5 and Figure 6, under the situation of traditional Sewing machines, the timing of the hook 51 of eedle 13 and shuttle 50 in the situation of left side lopping (promptly, eedle 13 forms the situation of coil in leftward position) and between the situation (that is, eedle forms the situation of coil in right positions) of right side lopping, a great difference is arranged.More specifically, compare with the situation of middle lopping respectively (that is, eedle 13 forms the situation of coil in the centre), the hook 51 of shuttle 50 is delay+θ under left side lopping situation, and shifts to an earlier date under the situation of right side lopping-θ.As shown in Figure 5 and Figure 6, the distance (hL, hM and hR) between the hook 51 of the gap between the hook 51 of eedle 13 and shuttle 50 (δ L, δ M and δ R) and pinprick 13a and shuttle 50 changes according to the knitting position of eedle.The traversing amount of eedle 13 is big more, and these changes are remarkable more.Can cause like this and comprise the defective that produces interference between bouncing pilotage and eedle 13 and the shuttle 50.
Yet, by implementing can to prevent these defectives according to the mechanism of present embodiment.Particularly, when computer was emitted in the order of left side lopping, when from Fig. 3 top view, the rotating shaft 38a up time eedle of stepper motor 38 rotated scheduled volume.The rotation of rotating shaft 38a makes the axle of cam 42 clockwise rotate scheduled volume, and this makes pin 35 follow cam surface 42a upwards.Simultaneously, to follow cam surface 42b downward for pin 33.So cam follower arm 34 is swung clockwise with respect to axle 25.The motion of cam follower arm 34 is delivered to straining pulley carriage 26 via the screw bolt 29 that contacts with protuberance 34a, therefore straining pulley 23 is moved to left.Simultaneously, straining pulley carriage 31 is swung clockwise with respect to lining 27, therefore straining pulley 24 is moved to left.Therefore, as shown in Figure 8, under the situation of left side lopping, compare with the situation of middle lopping, second Timing Belt wheel 20 shifts to an earlier date+θ/2 with respect to first Timing Belt wheel 6b, thereby revised shown in the left side lopping situation of Fig. 6+θ, and therefore allowed eedle 13 and shuttle 50 as under the situation of middle lopping, having identical timing.Herein, correction needn't be accurate to+θ/2, as long as neither bouncing pilotage does not produce interference between eedle 13 and the shuttle 50 yet.
Next, when computer was emitted in the order of right side lopping, when from Fig. 3 top view, the rotating shaft 38a inverse time eedle of stepper motor 38 rotated scheduled volume.Logic with above-mentioned is opposite then, and straining pulley 23 and straining pulley 24 move to the right side with respect to axle 25, thereby makes Timing Belt wheel delay-θ/2.Thus, as shown in Figure 7, the hook 51 of eedle 13 and shuttle 50 meets in the best opportunity all the time, and irrelevant with the knitting position of eedle.
Variation by the tension force of the caused Timing Belt 22 of dimensional tolerance of the whole length of dimensional tolerance between last axle 3 and the lower shaft 17 and/or Timing Belt 22 is regulated by regulating screw bolt 29.
In addition, two of cam 42 cam surface 42a and 42b are arranged to have the tension force that makes Timing Belt 22 and keep constant cam contour.In this situation, as shown in Figure 9, straining pulley carriage 26 is with respect to disproportionate between the oscillating quantity of the corner of cam 42 and the oscillating quantity of straining pulley carriage 31 with respect to the corner of cam 42.
As shown in Figure 9, when the coil of eedle forms point when middle (drawing with solid line) changes to left side (drawing with dotted line), difference occurs between the travel distance L1 of straining pulley 23 and the travel distance L2 of straining pulley 24, more specifically, travel distance L1 is less than travel distance L2.Be equally applicable to form point changes to right side (drawing with double dot dash line) from middle (drawing with solid line) situation when the coil of eedle.
According to the mechanism in this embodiment of the present invention, straining pulley carriage 26 with respect to the corner of cam 42 from momentum (promptly, the travel distance L1 of straining pulley 23) and straining pulley carriage 31 with respect to the corner of cam 42 from momentum (promptly, the travel distance L2 of straining pulley 24), therefore allow the tension force of Timing Belt 22 to keep constant by straining pulley carriage 26 and 31 control independently respectively.By keeping the constant tension of Timing Belt 22, prevented the accidental change of shuttle 50 rotating speeds.In addition, according to the knitting position of eedle eedle 13 and shuttle 50 are met in best timing, thereby prevented the generation of bouncing pilotage.In addition, the torque that acts on respectively on axle 3 and the lower shaft 17 keeps constant, thereby has guaranteed the stable operation of Sewing machines under noiseless or vibration situation.
In a word, first embodiment of the invention described above provides the improvement to Zigzag sewing machine, wherein, last axle 3 is connected by the Timing Belt 22 that is used for synergic rotation with lower shaft 17, shuttle 50 rotates around fixing axis in response to the rotation of lower shaft 17, eedle 13 is motion vertically in response to the rotation of last axle 3, and eedle 13 laterally moves between first suture location and second suture location with respect to shuttle 50.Improvement is the timing relation for same the best of setting up eedle and shuttle 50 at first suture location and the second suture location place respectively, and improves and comprise: cam 42, and it comprises cam surface 42a and cam surface 42b and rotates by stepper motor 38; Straining pulley carriage 26 and straining pulley carriage 31, each free frame 2 supports in the mode that can rotate; And straining pulley 23 and straining pulley 24, it is respectively installed to straining pulley carriage 26 and also contacts with Timing Belt 22 all the time with straining pulley carriage 31, and straining pulley 23 is driven in cam surface 42a and straining pulley 24 is driven in cam surface 42b.
Second embodiment of the present invention is described below with reference to accompanying drawings.Same function is pointed out by the Reference numeral identical with first embodiment with part.Below explain in detail function and the part that is different from first embodiment.
As shown in figure 10, be arranged on the screw hole 2a and the 2b that are used for carriage 39 is installed to frame 2 on the frame 2 and be substantially elliptical separately, and screw hole 2a and 2b to be positioned at axle 25 be on the concentrically ringed circumference at center.Therefore, the established angle of straining pulley carriage 26, straining pulley carriage 31, cam follower arm 34, cam 42 and the stepper motor 38 that combines with carriage 39 is adjustable.Can regulate the relative position of cam follower arm 34 and straining pulley carriage 26 by regulating the screw bolt 29 that screws in the straining pulley carriage 26.So straining pulley 23 moves with respect to straining pulley 24, and therefore regulated the tension force of Timing Belt 22.
Based on the rotation of straining pulley carriage 26 around axle 25, as shown in figure 11, when under the situation with the position adjustments+α of straining pulley 23 under the middle lopping situation, under left side lopping situation and right side lopping situation straining pulley 23 moving+position of α also contacts with Timing Belt 22.In above-mentioned situation, inconsistent between the left side of its closed-loop shaped and right side in the length of Timing Belt 22 under left side lopping situation and the right side lopping situation.This is because cam 42 is designed so that straining pulley 23 and straining pulley 24 are driven and move under middle lopping situation--in other words, thereby regulate under the situation of the length do not change Timing Belt 22 not carrying out timing--the virtual line (that is straight line) of taking turns 20 center with respect to the center of first Timing Belt wheel 6b that is mounted on axle 3 and second Timing Belt that is installed to lower shaft 17 setting that is mutually symmetrical.
In Figure 12, the advance angle tolerance of δ 1 (drawing) expression second Timing Belt wheel 20 when straining pulley 23 move angle S1, the advance angle tolerance of δ 2 expressions second Timing Belt wheel 20 when straining pulley 23 move angle S2 with solid line.
As explaining among Figure 12, S1 and S2 equate, yet δ 1 and δ 2 do not wait.Even this show straining pulley 23 mobile phases with amount, the advance angle tolerance of second Timing Belt wheel 20--in other words, the change amount of the right length of its closed-loop shaped--depend on the position of straining pulley 23 setting in motions and change.So when straining pulley 23 as mentioned above only during adjusting+α, the lax/tensioning that is applied to Timing Belt 22 by straining pulley 23 changes, thus cause lax/tensioning of applying by straining pulley 23 and lax/tensioning of applying by straining pulley 24 between produce difference.Therefore, the tension force of Timing Belt 22 becomes non-constant.
As shown in figure 13, in order to make straining pulley 23 and straining pulley 24 provide identical belt slack/tensioning to Timing Belt 22, they need mobile lesser degree during near described straight line when straining pulley 23 and straining pulley 24, and when they move the bigger number of degrees during away from straight line.Being used for carriage 39 is installed to that screw hole 2a on the frame 2 and 2b be substantially elliptical separately and be positioned at axle 25 is the concentrically ringed circumference at center, therefore straining pulley carriage 39 can rotate with respect to frame 2, and the straining pulley carriage 26, straining pulley carriage 31, cam follower arm 34, cam 42 and the stepper motor 38 that therefore combine with carriage 39 also can rotate with respect to frame 2.
When straining pulley 23 adjusting+α and when carriage 39 during with respect to frame 2 rotation-α/2, under the situation of right side lopping, straining pulley 23 and straining pulley 24 are provided with respect to described straight line with being mutually symmetrical.Therefore, under the left side lopping situation and under right side lopping situation, it is consistent that the length of Timing Belt 22 becomes between the left side of its closed-loop shaped and right side.
Claims (8)
1. equipment that is arranged on the timing of the eedle that is used to regulate Sewing machines on the Zigzag sewing machine and shuttle, it is characterized in that described Zigzag sewing machine has: go up axle (3), it is used for driving the shank (12) that keeps eedle (13); Lower shaft (17), it is used to drive shuttle (50); Frame (2), it is used for supporting described axle (3) and the described lower shaft (17) gone up in the mode that can rotate; And Timing Belt (22), it is used to connect describedly goes up axle (3) and described lower shaft (17) and synchronizes them, and the equipment of the timing of described eedle that is used to regulate Sewing machines and shuttle comprises:
Cam member (42), it comprises first cam surface (42a) and second cam surface (42b) and is rotated by driving force;
The first arm member (26) and second arm member (31), each arm member is supported in the mode that can rotate by described frame (2); And
First belt pulley (23) and second belt pulley (24), described first belt pulley (23) and second belt pulley (24) are respectively installed to described the first arm member (26) with described second arm member (31) and contact with described Timing Belt (22) all the time, and described first belt pulley (23) is driven in described first cam surface (42a) and described second belt pulley (24) is driven in described second cam surface (42b).
2. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 1 and shuttle, wherein said cam member (42) is driven by stepper motor (38).
3. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 1 and shuttle, wherein said the first arm member (26) and described second arm member (31) are supported by the concentric shafts (25) that is arranged on the described frame (2).
4. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 3 and shuttle, wherein said cam member (42), described the first arm member (26) and described second arm member (31) are assembled on the carriage (39), and described carriage (9) relatively rotates to regulate the position of described carriage (39) with respect to described frame (2) around described axle (25) with respect to described frame (2) when assembling.
5. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 4 and shuttle is wherein by being arranged on the arcuate socket (2a and 2b) on the described frame (2) and passing the screw (40 and 40) that described arcuate socket (2a and 2b) is threaded onto in the described carriage (39) and realize described relatively rotating.
6. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 3 and shuttle, wherein said cam member (42) comprises dish, and described first cam surface (42a) and described second cam surface (42b) are arranged on the outer surface of described dish.
7. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 6 and shuttle, wherein said first cam surface (42a) and described second cam surface (42b) are arranged to adjacent one another are.
8. the equipment of the timing of eedle that is used to regulate Sewing machines as claimed in claim 1 and shuttle, wherein said Timing Belt (22) is arranged between described first belt pulley (23) and described second belt pulley (24), and in response to laterally moving of described shank (12), another reduction when an increase in described first belt pulley (23) and described second belt pulley (24) is applied to the tension force of described Timing Belt (22) in described first belt pulley (23) and described second belt pulley (24) is applied to the tension force of described Timing Belt (22), and another increase in described first belt pulley (23) and described second belt pulley (24) is applied to the tension force of described Timing Belt (22) when a reduction in described first belt pulley (23) and described second belt pulley (24) is applied to the tension force of described Timing Belt (22).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007073936 | 2007-03-22 | ||
| JP2007-073936 | 2007-03-22 | ||
| JP2008017686A JP5050880B2 (en) | 2007-03-22 | 2008-01-29 | Sewing hook timing adjustment device |
| JP2008-017686 | 2008-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101270537A true CN101270537A (en) | 2008-09-24 |
| CN101270537B CN101270537B (en) | 2011-11-09 |
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| CN2008100851821A Active CN101270537B (en) | 2007-03-22 | 2008-03-20 | Apparatus for adjusting timing of needle and looptaker of sewing machine |
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| Country | Link |
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| JP (1) | JP5050880B2 (en) |
| CN (1) | CN101270537B (en) |
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| CN113293535A (en) * | 2021-06-24 | 2021-08-24 | 东莞创辉缝纫机有限公司 | Locking-type chain type interchange integrated winch foot machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5050880B2 (en) | 2012-10-17 |
| JP2008264500A (en) | 2008-11-06 |
| DE602008000140D1 (en) | 2009-10-29 |
| CN101270537B (en) | 2011-11-09 |
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