CN1131712A - Loop device structure - Google Patents

Abstract

The present invention prevents abrasion and inadvertent disconnection of a device for preventing run-out of a coupling member that transmits rotation of the main shaft of a sewing machine to a driven shaft connected with a looper while converting the rotation into reciprocating rotation of the driven shaft in a looper mechanism. Run-out preventative devices formed of synthetic resin buffer members are disposed between a coupling member 8 and collars for eccentrically supporting a ball joint of a main shaft. The run-out preventative devices are fixed to the collars. Because the run-out preventative devices rotate together with the main shaft without rotating independently of the main shaft, no grinding occurs between the run-out preventative device and the collars. The run-out preventative devices have fitting holes that fit over the outer peripheries of the connecting parts of the ball joint and the collars and engaging parts 18 that engage with outer peripheral portions of the collars. The simple design of the devices prevents independent rotation of the devices.

Description

Loop device structure

The present invention relates to a kind of loop device structure that becomes seam machine etc., especially a kind of loop device structure that on the reciprocating connecting elements that rotatablely moving of machine spindle is converted to the device driven shaft of looping that the device of looping is housed, is provided with antihunting device.

The loop part stereogram of device of overlock machine has been shown among Fig. 8.Loop device structure 1 shown in the figure be by the machine spindle 2 that constitutes by bent axle drive simultaneously loop down device 3 and on the device 4 of looping, the device 5A that loops that conduct the 1st driven shaft of the device 3 of looping is installed down vertically is provided with respect to main shaft 2 with the device 5B that loops as driven shaft that the device 4 of looping is installed, simultaneously, device axle 5A respectively loops, 5B has spherical bearing 6 by two ends, 7 connecting rod 8 as connecting elements, 8 and one end has globe joint 9, and the other end is fixed on the device axle 5A that loops, crank arm 10 on the 5B, 10 are connected to and are located at main shaft 2 eccentric parts 11, crank-pin 12 on 11, on 12.

Crank- pin 12,12 is striden frame between discoideus flange part 13A, the 13B of the formation of the both sides of eccentric part 11,11, is supported on the position with main shaft 2 off-centre.At the pars intermedia of pin, form globe joint 14 as illustrated in fig. 9.The spherical bearing 6 of one end of connecting rod 8 is connected on the globe joint 14 of crank-pin 12, and the spherical bearing 7 of the other end is connected on the globe joint 9 of crank arm 10, thus, rotatablely moving of main shaft 2 is converted to passes to crank arm 10 with moving up and down.Like this, under the situation of Fig. 9, swing up and down by making crank arm 10, the just reciprocating motion in certain slewing area of device axle 5A of looping just makes following device 3 swings of looping that are mounted thereon.

On the loop action of mechanism of device 4 one sides identical with the action of the mechanism of device 3 one sides of looping down, rotatablely moving of main shaft 2 converts the reciprocating motion of the device axle 5B that loops to by connecting rod 8 and crank arm 10, the result makes device 4 swings of looping.

Yet, because being the spherical bearings 6,7 with its two ends, connecting rod 8 is connected on the globe joint 9 of the globe joint 14 of crank-pin 12 and crank arm 10, thereby can carry out stereo-motion all around, on the contrary, also can make connecting rod 8 vibrations as Figure 10, center line Q-Q ' ground shown in Figure 11 with respect to connecting rod 8, be easy to generate unwanted motion, the flange part 13A, the 13B that form on the eccentric part 11 of connecting rod 8 and main shaft 2 are contacted, thereby produce the wearing and tearing and the noise of connecting rod 8.

Be to be installed on the both ends of crank-pin 12 as shown in figure 13 by the ring-type antihunting device 15 that plastics that will be are as shown in figure 12 made in the past, and prevented the flange part 13A of connecting rod 8 and main shaft 2,13B directly contacts.

Yet antihunting device 15 in the past when main shaft 2 rotates as illustrated in fig. 14, because antihunting device 15 is around crank-pin 12 rotations, thereby can rub between flange part 13A, the 13B of antihunting device 15 and main shaft 2, and antihunting device 15 is worn and torn.Because antihunting device 15 in the past contacts with the circumference of flange part 13A, 13B, thereby begins wearing and tearing from its peripheral part 15a as illustrated in fig. 15, along with further wearing and tearing, quicken it and narrow down, come off from crank-pin 12 at last.

The present invention makes for solving above-mentioned the problems of the prior art, and its objective is provides prevent to wear and tear, come off a kind of having; The loop device structure that can keep the high antihunting device of the reliability of vibration-isolating effect for a long time.

The loop device structure of the present invention of making for achieving the above object is that the driven shaft that will the device of looping be housed disposes with respect to main shaft perpendicular quadrature ground, crank arm is vertically fixed on the above-mentioned driven shaft, simultaneously, have by both ends in the middle of the connecting elements of spherical bearing the globe joint and above-mentioned main shaft that above-mentioned crank arm leading section is set, the eccentric globe joint that is provided with couples together, thus rotatablely moving of above-mentioned main shaft is converted to the reciprocating motion of above-mentioned driven shaft, make the above-mentioned device swing of looping, it is characterized in that supporting prejudicially the globe joint of above-mentioned main shaft, between flange part that forms on the above-mentioned main shaft and above-mentioned connecting elements, be provided with antihunting device, and this antihunting device is fixed on the flange portion.

In loop device structure of the present invention, above-mentioned antihunting device be preferably made with above-mentioned flange part on the protuberance of the recess tabling that forms.

In addition, above-mentioned antihunting device is preferably made the ring-type with the joint portion periphery tabling of above-mentioned flange part and globe joint, and makes the joint portion that combines with the peripheral part of above-mentioned flange part.

Loop device structure of the present invention with said structure by antihunting device is fixed on the flange part of main shaft, makes antihunting device not carry out rotation with respect to main shaft.Thus, the flange of antihunting device and main shaft is friction just not, thereby can prevent the wearing and tearing of antihunting device and come off, and can improve reliability.

Owing to stretch into the recesses such as groove of instrument when forming on the flange portion of above-mentioned main shaft as Unit Installation and repairing, thereby can prevent the rotation of antihunting device with simple structure by the protuberance of setting on antihunting device with this recess tabling with respect to main shaft.

In addition, because the globe joint of above-mentioned main shaft is supported on the eccentric position by above-mentioned flange part, thereby can be by above-mentioned antihunting device being made the ring-type with the joint portion tabling of above-mentioned flange part and globe joint, make the joint portion that combines with the peripheral part of above-mentioned flange part simultaneously, prevent the rotation of antihunting device with respect to main shaft with simple structure.

Fig. 1 is the part front view of an embodiment of expression loop device structure of the present invention;

Fig. 2 is the front view of the spindle eccentricity part of loop device structure shown in Figure 1;

Fig. 3 is the cutaway view of obtaining along III-III ' line among Fig. 2;

Fig. 4 (a) is the front elevation of the antihunting device adorned on the flange part of Fig. 2 left side, and Fig. 4 (b) is the front elevation of the antihunting device adorned on the flange part of right side;

Fig. 5 is the stereogram of another embodiment of expression antihunting device;

Fig. 6 is the plane of another embodiment of expression antihunting device;

Fig. 7 is the front elevation of expression antihunting device installment state shown in Figure 6;

Fig. 8 is the part stereogram that becomes to stitch the machine loop device structure;

Fig. 9 is the part front elevation of loop device structure shown in Figure 8;

Figure 10 is the vibrational state schematic diagram of expression around the connecting elements axle;

Figure 11 is the vibrational state schematic diagram of expression around the connecting elements axle;

Figure 12 is a schematic diagram of representing in the past to be installed in the antihunting device on the loop device structure, and wherein (a) is plane, (b) is the cutaway view of obtaining along the B-B line in (a);

Figure 13 represents the front elevation of the antihunting device installment state of loop device structure in the past;

Figure 14 represents the key diagram of the antihunting device of loop device structure in the past with respect to the autorotation of main shaft;

Figure 15 is the plane of the state of wear of expression anti-locking apparatus shown in Figure 12.

With Fig. 1～Fig. 7 the embodiment of loop device structure of the present invention is described below.

Loop device structure 1A shown in Figure 1 with by in the loop device structure shown in Figure 81, promptly with the main shaft 2 that constitutes the bent axle Sewing machines drives simultaneously time loop device 3 and on the loop mechanism of device 3 one sides of looping in the mechanism of device 4 suitable, the device axle 5A that loops as the driven shaft that the device 3 of looping down is installed disposes with respect to main shaft 2 perpendicular quadrature ground, simultaneously, the device axle 5A that loops makes spherical bearing 6 by two ends, 7 a connecting rod 8 and an end as connecting elements have globe joint 9, the other end is fixed on crank arm on the device axle 5A that loops and is connected on the crank-pin 12 on the eccentric part 11 of being located at main shaft 2.

Crank-pin 12 is erected between discoideus flange part 13A, the 13B that eccentric part 11 both sides form, and is supported on the position with main shaft 2 off-centre, and the intermediate portion forms globe joint 14.A spherical bearing 6 of connecting rod 8 links to each other with the globe joint 14 of crank- pin 12, and 7 of another spherical bearings link to each other with the globe joint 9 of crank arm 10, thus rotatablely moving of main shaft 2 is converted to move up and down and pass to crank arm 10.Then,, make the device axle 5A reciprocating motion within the specific limits of looping, the following device 3 of looping that is provided with on it is swung by swinging up and down of crank arm 10.

In the loop device structure 1A of present embodiment, be connected with the globe joint 14 of crank-pin 12 and the globe joint 9 of crank arm 10 respectively because connecting rod 8 is spherical bearings 6,7 with its two ends, thereby can follow generation unwanted motion shown in Figure 11.

Therefore, in the loop device structure 1A of present embodiment, in order to prevent that this connecting rod 8 from contacting with the direct of flange part 13A, 13B of main shaft 2, the discoideus antihunting device 16A, the 16B that constitute with the roughly the same buffer of being made by synthetic resin of the diameter of flange part 13A, 13B are installed between the left and right sides of main shaft 2 flange part 13A, 13B and connecting rod 8.

Antihunting device 16A, 16B are entrenched on the end of crank-pin 12 embedded hole 17 of eccentric formation on anti-shape part, simultaneously, with its circumference, the ring-type joint portion 18 that forms in the fringing mode is contained on the main shaft 2 in combination with the outer peripheral edges portion of flange part 13A, 13B, can not be rotated to rotation with respect to main shaft 2 with being integral.

In addition, form the chimeric protuberance 20 of the formed groove of the outer peripheral edges portion of flange part 13A, 13B of main shaft 2 19 among antihunting device 16A, the 16B, thereby prevent antihunting device 16A, 16B rotation fully with respect to main shaft 2.Like this, antihunting device 16A, 16B just can not rub with flange part 13A, the 13B of main shaft 2, also just prevented antihunting device 16A, 16B wearing and tearing, come off, can improve its reliability.

Fig. 4 (a) and Fig. 4 (b) difference presentation graphs 2 right sides and left side flange part 13A, the antihunting device 16A of the last installation of 13B, the plane of 16B.

Narrow cutting seam 21 from antihunting device 16A, 16B outer peripheral edges form to embedded hole 17 is respectively installed on left and right sides flange part 13A, the 13B by opening this cutting seam.In the present embodiment, on the position that the protuberance 20 that will prevent people's vibrating device 16A, 16B separates, form narrow cutting seam 12, when antihunting device 16A, 16B rotate with main shaft 2, effectively utilized the centrifugal force that acts on protuberance 20, thereby can form the structure that prevents that narrow cutting seam 21 from enlarging.

Yet, because above-mentioned antihunting device 16A, 16B is provided with and the protuberance 20 of the groove of flange part 13A, 13B 19 tablings, thereby on left and right sides flange part 13A, 13B, identical antihunting device can not be installed, install on the left and right sides flange part 13A be installed must prepare respectively on the left and right sides flange part 13B.

To this, Fig. 5 and antihunting device 22,23 shown in Figure 6 be not owing to form protuberance 20, though can not have antihunting device 16A, the 16B of Fig. 4 such prevent the rotation effect, it can be installed in the antihunting device of same structure on left and right sides flange part 13A, the 13B, this is an one advantage.

The antihunting device 22 of Fig. 5 forms joint portion 24 on a part of circumference made from the roughly the same plate portion of flange part 13A, 13B diameter.In addition, on antihunting device 22, narrow cutting seam 26 is set on the shortest part of embedded hole 17 and outer peripheral edges portion, so just on main shaft 2, installs easily.

Antihunting device 23 shown in Figure 6 is to make its miniaturization by the structure on it being formed around the joint portion only be contained in the crank-pin 12 of flange part 13A, 13B.In addition, on position on this antihunting device 23, that the joint portion 25 that combines with the outer peripheral edges portion of flange part 13A, 13B is separated, form narrow cutting seam 27, when antihunting device 23 rotates with main shaft 2, can effectively utilize the centrifugal force that acts on the joint portion 25, thereby form the structure that can prevent that narrow cutting seam 27 from enlarging.Fig. 7 shows an example of these antihunting device 23 installment states.

More than be to the specifying of the embodiment of the invention, but the present invention is not restricted to the described embodiments, in the scope that does not break away from its theme, can does various distortion.

For example, the foregoing description is that the mechanism to device 3 one sides of looping down is illustrated, but on the loop mechanism of device 4 one sides, can obtain identical effect fully by the antihunting device shown in the foregoing description is installed.

In addition, the embedded hole 17 of antihunting device all forms circular in the foregoing description, this is because the junction surface of flange part 13A, 13B and globe joint 14, the peripheral shape that is the both ends of crank-pin 12 in the above-mentioned example is circular, when this part is shaped as ellipse or rectangle, the shape of embedded hole 17 also should be ellipse or the rectangle that matches with it, just can prevent the antihunting device rotation effectively thus.

In addition, as preventing that fully antihunting device rotation and the method that comes off from being that antihunting device is adhesively fixed on flange portion 13A, 13B, this also is effectively.

Because loop device structure of the present invention is by being fixed on antihunting device on the flange portion of main shaft, allow the flange part and the antihunting device of main shaft not rub, thereby can prevent antihunting device wearing and tearing, come off, thereby can keep the vibration-isolating effect of antihunting device for a long time.Can suppress the wearing and tearing of connecting elements and the generation of noise thus.

Claims (1)

1. the loop device structure of a Sewing machines, the driven shaft that it will be equipped with the device of looping disposes with respect to main shaft perpendicular quadrature ground, crank arm is vertically fixed on the above-mentioned driven shaft, simultaneously, have by both ends in the middle of the connecting elements of spherical bearing the globe joint and above-mentioned main shaft that above-mentioned crank arm leading section is set, the eccentric globe joint that is provided with couples together, thus rotatablely moving of above-mentioned main shaft converted to the reciprocating motion of above-mentioned driven shaft, make the above-mentioned device swing of looping, it is characterized in that: the globe joint that supports above-mentioned main shaft prejudicially, between flange part that forms on the above-mentioned main shaft and above-mentioned connecting elements, be provided with antihunting device, and this antihunting device is fixed on the flange portion.

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