KR20060063954A - Needle selector for knitting machine - Google Patents

Abstract

A needle selector for knitting machines in which a working needle is selected using a piezoelectric having a piezoelectric element. Oscillation of the piezoelectric, supported movably on a housing, is stabilized by rotatably holding an intermediate position between the rear end part and the forward end part of the piezoelectric on the housing using a rotator. Cross-sectional structure of the rotator (3) in a plane perpendicular to the axis of the rotator (3) and to the plane of the piezoelectric is arranged such that the lateral curvature of the piezoelectric (2) becomes smaller than the longitudinal curvature. Consequently, a needle selector in which the oscillation speed and torque of the piezoelectric are enhanced significantly while saving energy can be provided.

Description

Needle selector for knitting machine {Needle selector for knitting machine}

TECHNICAL FIELD This invention relates to the needle tip device used for knitting machines, such as a circular knitting machine or a flat knitting machine. More specifically, the present invention relates to a knitting machine needle needle device which makes it possible to perform the needle needle of the knitting needle more efficiently by operating the piezoelectric driving structure in the knitting machine while suppressing the bending motion of the piezoelectric body in a predetermined direction.

In a knitting machine such as a circular knitting machine or a flat knitting machine, the vertical movement of the knitting needle is selected based on the knitting procedure stored in a storage device such as a floppy disk, and a letter of a desired knitting organization is formed. Various needle tips are used to select the vertical movement of the knitting needle.

Hereinafter, such a needle needle device will be described. First, the outline of the line needle work in the knitting machine will be described based on the circular knitting machine shown in Figs. 14, 15A and 15B.

It is a schematic perspective view explaining the basic knitting mechanism of a circular knitting machine. As shown in Fig. 14, the circular knitting machine is knitted in a plurality of longitudinal grooves (not shown) provided along the longitudinal axis of the knitting cylinder 51 on the edge surface of the knitting cylinder 51 that is rotated as indicated by arrow A. In FIG. The needle 52 is slidably arranged. Below the knitting needle 52, as shown to FIG. 15A and FIG. 15B, the line needle jack 53 is arrange | positioned so that the lower side of the knitting needle 52 can be contacted. On the other hand, below the knitting cylinder 51, the cylindrical cam stand 54a is stopped and arrange | positioned, and the some cam 54 of a predetermined shape is arrange | positioned at the predetermined space above the cam stand. When the needle tip 53 is pushed up by the cam 54, the knitting needle 52 is pushed upward.

The basic principle of organization is as follows. When each knitting needle 52 on the rotating knitting cylinder 51 is pushed upward through the needle needle 53, the knitting needle 52 protrudes from the upper surface of the knitting cylinder 51. The loop of the thread is made by supplying the thread 56 extracted from the failure 55 to the hook of the protruding knitting needle 52, and then the knitting needle 52 is removed by a known mechanism (not shown). One nose (knot) is formed by lowering. Therefore, a desired letter can be formed by forming a nose by selecting whether or not to give the knitting needle 52 up or down movement, or by proceeding to the next knitting step without forming a nose. In order to impart this operation to the knitting needles, in the knitting machine, generally, the needle tip 53 is arranged to be in contact with the lower side of the knitting needle 52, and a controller 58 having a storage device storing the knitting order of the knitting structure is incorporated. Using the needle tip 57 operating on the basis of the information from), the engagement of the needle tip 53 with the knitting needle 52 is selectively performed to control the vertical movement of the knitting needle.

Next, with reference to Figs. 15A and 15B showing the relationship between the knitting needle, the selection jack, and the needle tip, a case where a piezoelectric body is used as the needle tip is described below.

The piezoelectric body 2 can be curved as shown in FIG. 15A or bend as opposed to FIG. 15A as shown in FIG. 15B depending on the method of applying the voltage. Fingers 5 are arranged consecutively at the tip of the piezoelectric body 2. 15A and 15B, the piezoelectric member 2, the finger 5 and the cam 54 are positioned as shown, and the knitting needle 52 and the needle pin 53 are knitted cylinders 51 ( In addition, the circular motion is performed downward from the upper surface of the drawing (or vice versa). The needle tip 53 is swingable around a point 53a, and the needle tip 69 and the cam bat 70 protrude laterally as shown from the needle tip 53. As shown in FIG.

As shown in Fig. 15A, when the piezoelectric member 2 is curved, the needle tip 69 of the needle tip 53 that is circularly moved impinges on the finger 5, and as a result, the cam needle of the needle tip 53 is used for the cam. The batt 70 cannot engage the cam 54. Therefore, the needle tip 53 is not pushed upward by the cam 54, and the knitting needle 52 is not pushed upward.

As shown in FIG. 15B, when the piezoelectric body 2 is bent, the finger 5 at the tip of the piezoelectric body 2 is a needle for selecting a needle of the needle pin 53 that is circularly moved together with the knitting cylinder 51. Without colliding with 69, the needle bar 53 maintains the posture in the vertical direction. As a result, the cam bat 70 at the lower end of the pin needle jack 53 is pushed upward along the inclined surface of the cam 54, whereby the knitting needle 52 is pushed upward.

By selectively engaging the needle tip 69 of the needle tip 53 with the finger 5 at the tip of the piezoelectric element 2, it is possible to freely move the knitting needle 52 as desired. Thus, letters of any knitting organization can be organized.

The most important performance in knitting is that the productivity is high, that is, the number of turns of the knitting cylinder can be increased. In order to increase the rotation speed of the knitting cylinder 51, it is necessary to operate the needle tip device 57 that controls the upward movement of the knitting needle 52 at a high speed. To this end, various knitting needles for high speed operation have been developed and used.

For example, the same applicant as the applicant of the present invention proposes a needle tip device capable of oscillating a plurality of fingers using suction or repulsive force of an electromagnet (see Japanese Laid-Open Patent Publication No. 60-224845), and a conventional needle tip Higher speed and smaller size than the device, the power consumption is reduced. In addition, the same applicant as the applicant of the present invention proposes a piezoelectric needle tip device in which a needle is needled by actuating a finger by bending the piezoelectric material instead of the needle tip device using the electromagnet described above. 62-28451), the needle tip device is further speeded up, downsized and energy-saving.

In addition, the same applicant as the applicant of the present invention invented the improvement device of the piezoelectric needle tip device described above on October 5, 1988, and was entitled to the Japanese Patent Application No. 249967, which is entitled "Knitting needle tip device". It was submitted to the Patent Office. This is registered as Japanese Patent No. 1969970 (see Japanese Patent Publication No. Hei 6-94619), and the corresponding US application is also registered as USP5,027,619.

The piezoelectric needle tip device shown in Japanese Patent No. 1969970 is shown in Fig. 12A. As shown in Fig. 12A, the improved needle tip device arranges the fingers 5 rotatably on the piezoelectric element 2 having the piezoelectric elements, and applies the electric power to the piezoelectric elements to operate the fingers 5, The needle 5 is a needle needle for the knitting machine which enables the knitting of the knitting needle of the knitting machine (more specifically through the jack) by the operation of the finger 5, and enables the knitting of a letter having a predetermined pattern structure. The rear end is rotatably supported by the support body A or the housing via the rotating body 1A, and the front end of the piezoelectric body is rotated in the U-shaped groove of the rear end of the finger 5 via the rotating body 1B. The finger 5 and the piezoelectric member 2 are connected to each other, and the intermediate position between the rear end portion and the front end portion of the piezoelectric member 2 is fitted to the support body 13 or the rotatable body 30 rotatably installed in the housing. ) Is arranged in a straight line.

As shown in FIG. 12A, when the piezoelectric body 2 is supported by the support body 13 by the rotating body 30 and the piezoelectric body 2 is bent, the movement is performed at the rear end 5A of the finger 5. ) Up and down movement. As a result, the tip 5B of the finger 5 which protrudes through the opening 19a of the support 19 is moved up and down, and thus the upward movement of the knitting needle 52 is selected.

In this way, by supporting the predetermined position of the piezoelectric body 2 in a rotatable manner, the piezoelectric body 2 can be freely bent, and as a result, the movement speed of the finger 5 is extremely increased while the movement speed of the tip of the finger 5 is increased. Applicants have found this to be large. In addition, by using the piezoelectric body in such a configuration, it is possible to reduce the damage of the piezoelectric body and to prolong the life of the needle tip device. Therefore, this improved piezoelectric needle tip device has a remarkable improvement in the needle tip capability because the structure of the finger operating device that swings the finger member is innovatively improved.

As can be seen from the fact that the piezoelectric body began to be used as a diaphragm for a speaker, the piezoelectric element basically vibrates over all directions (360 degrees) in a plane when electric power is applied. When the piezoelectric element vibrating in all these directions is formed into a rectangular plate shape and one end of the long side is fixed, the other end swings up and down as a cantilever. However, even in this case, since the vibration of the piezoelectric body is in all directions, the vibration component in the width direction of the rectangular piezoelectric body remains. Conventionally, the vibration component generated in the width direction has been overlooked as inevitable by those skilled in the art.

In the conventional needle tip device shown in Fig. 12A, the rotary body 30 supporting the piezoelectric member 2 in the intermediate position has the piezoelectric member 2 in the longitudinal axis direction from the end face thereof as shown in Fig. 12B. ) Is a cylindrical member having a slit 32 for supporting. The rotating body 30 is rotatably supported by inserting the shaft head 31a of the circular cross section at the end into a circular hole (not shown) provided in the support 13.

In the example shown in FIG. 12A, the piezoelectric bodies 2 are fitted into the slits 32 from the left and right sides of the rotating body 30, respectively. As shown in FIG. 13, the piezoelectric bodies 2 are fitted to the center portion. You may comprise as one cylindrical body 40 provided with a slit (not shown).

Also in this case, the piezoelectric body is rotatably supported by inserting and supporting the shaft heads 40a and 40b having a circular cross section in the circular holes of the support 13.

As described above with reference to FIGS. 12B and 13, in the conventional needle needle apparatus, the cylindrical member supporting the piezoelectric member in the intermediate position to be rotatable was a cylindrical member having a circular cross section.

As described above, the present inventors have made various countermeasures while paying attention to the high speed, miniaturization, and energy saving of the knitting machine for knitting machines. However, more performance is required.

Thus, the present inventors have studied closely to obtain a more efficient oscillation motion of the piezoelectric body. As a result, it has been found that it is difficult to more efficiently concentrate the vibration of the piezoelectric body in the longitudinal direction of the piezoelectric body as long as a cylindrical member having a circular cross section is used. In particular, by reducing the size of the needle tip device, the diameter of the cylindrical body that supports the piezoelectric body in a pivotal position tends to be small. The present inventors have found that the smaller the diameter of the cylindrical body is, the more prominent the tendency of vibration in the width direction is to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a knitting machine needle knitting device having a novel structure which can suppress the occurrence of a loss in the oscillation motion of the piezoelectric body of the conventional knitting machine needle knitting device.

The present invention comprises a plate-shaped piezoelectric body having a piezoelectric element and a finger provided to be movable in the same linear direction as the piezoelectric body, wherein the rear end portion of the piezoelectric body is rotatably supported in the groove of the support or the housing in the groove. And pivotally connect the distal end portion of the piezoelectric member to the rear end portion of the finger, and support the intermediate position of the rear end portion and the distal end portion of the piezoelectric body in a rotating body rotatably installed in a support or a housing. A needle for a knitting machine which operates the finger by applying a voltage, thereby performing knitting of the knitting needle of the knitting machine, and enables knitting of a letter of a predetermined pattern structure, wherein the rotating body is provided on the support or the housing. It consists of a central portion between the shaft head and both shaft heads installed on both ends so as to be supported by the bearing And a slit for fitting the piezoelectric body in at least part of the width direction of the piezoelectric body of the central portion, the axial cross-sectional structure of the central portion in a plane perpendicular to the axis of the rotating body and perpendicular to the plane of the piezoelectric body. A knitting machine needle knitting apparatus, characterized in that the curvature in the width direction of the piezoelectric body is suppressed to be smaller than the curvature in the longitudinal direction of the piezoelectric body.

More specifically, the suppression of the curvature of the width direction by the piezoelectric body of the knitting machine needle according to the present invention, the width direction by the rotating body generated when the axial cross-sectional structure of the central portion is rounded with the same material It is characterized by making it larger than the suppression of curvature.

The present invention is intended to change the cross-sectional structure of the central portion of the rotating body in order to suppress the movements other than the rocking motion along the longitudinal direction of the piezoelectric plate generated by applying a voltage. As described above, the diameter of the rotating body in the pin needle device becomes small as a result of integration of various other technologies, and the piezoelectric body tends to bend in the width direction. Therefore, the necessity of suppressing the curvature in the width direction is considered to be greater than the curvature in the longitudinal direction of the piezoelectric body, but this problem is solved by the present invention.

As the structure of the center part, the simplest structure includes one having an ellipsoid whose cross section perpendicular to the axis of the rotor has a longitudinal direction of the piezoelectric body. However, the shape is not limited to an ellipse, but may be a shape in which the length along the longitudinal direction of the piezoelectric body in the center portion is shorter than the length along the vertical direction (direction perpendicular to the plane of the piezoelectric body) of the piezoelectric body. In particular, when the needle tip device becomes smaller in size in the future and the diameter of the rotating body becomes smaller, the suppression of vibration in the width direction of the piezoelectric body becomes further insufficient. Therefore, in order to provide a stronger suppression force against the vibration of the piezoelectric member in the width direction, the cross section of the rotating body supporting the piezoelectric body at the intermediate position of the needle tip device is, for example, shaped like a railroad rail, i.e., the upper and lower portions of the center of the rotating body. It is also effective to provide a rib-like protrusion at a position away from the slit in any one or both of them.

Further, in the cross-sectional structure of the central part of the rotating body, two or more layers of bending rigidity are formed of different materials, and as a material used for a portion away from the slit, a material having a higher bending rigidity than a material used for a portion near the slit is used. It is also a preferred embodiment to use. In this case, as the material of the two layers, for example, a plastic material having different bending stiffness may be used, or plastic may be used at a portion close to the slit, and a metal material such as steel may be used at a portion far from the slit.

Thus, the structure of the rotating body of the present invention, as described above, the change of the shape in the cross section perpendicular to the axis of the rotating body and the partial change of the material used in the vertical cross section, these two methods and their This can be achieved by a combination of the two methods.

Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same components are assigned the same reference numerals.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and together with the description, are used to explain the principles of the present invention.

1 is a perspective view showing the structure of a knitting machine for knitting machines according to an embodiment of the present invention.

FIG. 2 is a central longitudinal cross-sectional view of the knitting machine for knitting machine shown in FIG. 1. FIG.

3A and 3B show an example of a rotating body supporting the piezoelectric body in the intermediate position in the knitting needle for needle knitting according to the present embodiment. FIG. 3A is a perspective view and FIG. 3B is a view seen from the direction of the rotation axis.

4A and 4B show another example of a rotating body for supporting the piezoelectric body in the intermediate position in the knitting needle for needle knitting according to the present embodiment. FIG. 4A is a perspective view and FIG. 4B is a view seen from the direction of the rotation axis.

5A to 5C are views showing still another example of the rotating body supporting the piezoelectric body at the intermediate position in the knitting needle for needle knitting according to the present embodiment, FIG. 5A is a perspective view, and FIG. 5B is a cross sectional view seen from AA of FIG. 5A. 5C is a cross sectional view of a modification of the embodiment shown in FIG. 5B.

FIG. 6 is a view showing still another example of a rotating body supporting the piezoelectric body in the intermediate position in the knitting needle for needle knitting according to the present embodiment, showing a state seen from the rotation axis direction.

7A and 7B show still another example of a rotating body supporting the piezoelectric body in the intermediate position in the knitting needle for needle knitting according to the present embodiment, in which FIG. 7A is a perspective view and FIG. 7B is a view seen from the direction of the rotation axis.

8A and 8B are views showing an example of a known rotating body that movably supports the rear end portion of the piezoelectric body in the support portion or the groove portion of the housing in the knitting needle according to the present embodiment. 8B is a perspective view of the rotor in relation to the support.

FIG. 9A is a perspective view of a knitting needle for needle knitting according to the present embodiment, which is movably connected to a finger at a tip end portion of a piezoelectric body, which is a known finger.

Fig. 9B is a diagram showing the stroke of the tip of the piezoelectric tip on the finger side which is affected by the positional movement of the rotating body in the intermediate position in the bending motion of the piezoelectric body in the knitting needle of the present embodiment.

9C is a schematic diagram illustrating an example of a housing in which a plurality of piezoelectric elements are arranged and used in a layered manner in the knitting needle for knitting machine of the present embodiment.

10A to 10C are perspective views showing an example of a rotating body supporting the piezoelectric body in the intermediate position in the pin needle apparatus of the present embodiment and the conventional example, and FIGS. 10A and 10B show a conventional example, and FIG. 10C shows one embodiment of the present invention. It is a figure which shows an Example.

Fig. 11 is a graph showing the relationship between the stroke and the torque affected by changing the shape of the rotating body supporting the piezoelectric body in the intermediate position.

12A and 12B show an example of a conventionally known knitting needle needle device, FIG. 12A is a perspective view, and FIG. 12B shows an example of a rotating body supporting the piezoelectric body used in the needle needle device shown in FIG. 12A at an intermediate position. Perspective view.

Fig. 13 is a perspective view showing another known rotating body used in a conventionally known knitting needle needle device in relation to a piezoelectric body.

It is a schematic diagram explaining the vertical motion of the knitting needle given by the pattern knitting mechanism in a circular knitting machine.

15A and 15B are diagrams showing the relationship between the bending of the piezoelectric body and the vertical motion of the knitting needle in the knitting needle needle device. FIG. 15A is a schematic view showing a case where the knitting needle is not operated by a cam, and FIG. 15B is The figure which shows the case where the knitting needle is operated by a cam.

The present invention will be described in detail below with reference to the accompanying drawings showing an embodiment of a needle knitting device for knitting machines of the present invention.

1 is a perspective view of a knitting machine for knitting machines according to an embodiment of the present invention, and FIG. 2 is a central longitudinal cross-sectional view of the knitting machine for knitting machines shown in FIG. 1.

As shown in these figures, the end portion 2A is inserted after the spherical body 1A of the piezoelectric body 2 is mounted in the groove 17 of the support portion 150 supporting the rear end of the piezoelectric body of the support body A. do. 8A shows a perspective view of the spherical body 1A.

A groove is provided in the edge part of spherical body 1A, and the edge part of the piezoelectric body 2 is inserted in this groove, and is fixed. As shown in FIG. 8B, since the spherical portion of the spherical body 1A can rotate within the groove 17 of the support, the rear end portion 2A of the piezoelectric body 2 is upward, as indicated by the arrow in FIG. 8B. Or it can be rotated downward.

The front end portion 2B of the piezoelectric body 2 is mounted with a spherical body 1B similar to the rear end portion, and the spherical body 1B is clamped by the open end of the rear end 5A of the finger 5. It is. This spherical body 1B can also be rotated up or down in the rear end 5A of the finger 5 as indicated by the arrow in FIG.

As shown in FIG. 9A, a hole is provided in the rear end portion 5A of the finger 5 in the width direction of the finger 5, and a hole corresponding to the finger fixing portion 18 of the support A is also provided. By passing the shaft 6 through the two holes, the finger 5 is fixed to the fixing portion 18 in a rotatable manner. The finger 5 is connected to the piezoelectric body 2 so as to be located in a straight line (in the same direction) with the rectangular piezoelectric body 2. The tip 5B of the finger 5 protrudes from the opening 19A of the opening wall 19 of the support A provided at a position away from the finger fixing part 18.

The opening portion 19A is configured to have a width and a height corresponding to the process when the finger 5 moves up and down. The finger 5 engages or releases the knitting needle or the bat of the needle tip jack disposed in contact with the lower end of the knitting needle, following the bending motion of the plate 8 generated by the piezoelectric element 9. .

The rear end portion 2A of the piezoelectric body 2 and the intermediate position Y (see FIG. 9B) of the tip portion 2B are sandwiched by the rotating body 3 provided in the intermediate point portion 13 of the support A. FIG. Support The piezoelectric element 2 is intended to be bent at this intermediate position Y, and as shown in FIG. 9B (A), the closer the finger is, the faster the vibration speed of the finger and the smaller the amplitude X, but the torque is smaller. Increases. On the other hand, as shown in Fig. 9B (B), when away from the finger, the opposite phenomenon occurs, the amplitude X increases, but the torque decreases.

The intermediate position Y at which the piezoelectric body 2 is fitted in the rotating body 3 is a position of 1/3 to 2/3 of the total length of the piezoelectric body 2 from the rear end portion 2A of the piezoelectric body 2. It is preferable.

As described above, as the rotary member 3, a rod-shaped member having a circular cross section is conventionally used (see Figs. 12B and 13). If the rotor is used only to provide a waypoint in the piezoelectric body 2 to facilitate the bending movement, the rod-shaped member may be a rod-shaped member rotatable with respect to the support body A. There is no restriction on anything. Therefore, in the past, it is considered that the rod-shaped material of the circular cross section was used as the rotating body over the total length most readily available at that time.

3A, 3B, 4A, 4B, 5A, 5B, 5C, 6, 7A, and 7B show various embodiments of the structure of the rotating body 3, which is the main part of the present invention. It demonstrates based on.

The 1st Example of the rotating body 3 is shown to FIG. 3A (perspective view), and the figure seen from the axial direction is shown to FIG. 3B. The rotating body 3 of this first embodiment has shaft heads 31a and 31b at both ends, and the center part 33 is formed in an elliptical cross section having a long diameter L1 and a short diameter W1. The through hole 32 in which the piezoelectric body 2 is fitted is provided in the side part of the center part 33. As is apparent from FIG. 3B, the cross section perpendicular to the axial direction of the central portion 33 of the rotating body 3 is an ellipse. Moreover, from the shape of the center part 33 shown in FIG. 3B, and the positional relationship of the through-hole 32, the long diameter of an ellipse is a direction perpendicular | vertical to the plane of the piezoelectric body 2 in the cross section perpendicular | vertical to the axis line of the rotating body 3. As shown in FIG. As a result, it is understood that the curvature in the width direction of the piezoelectric body is suppressed to be smaller than the curvature in the longitudinal direction of the piezoelectric body. In this embodiment, the diameter R1 of the shaft head portion 31a is formed smaller than the short diameter W1 of the center portion 33.

In the rotating body 3a according to the second embodiment showing a perspective view in FIG. 4A and a view in axial direction in FIG. 4B, the diameter R2 of the shaft head portion 31a is defined by an elliptical short diameter ( Same as W2).

In the above-mentioned first and second embodiments, the ratio of the long diameter to the short diameter is selected depending on how much the suppression of the width direction of the vibration of the piezoelectric body 2 as the target is received.

Next, in the rotating body 3b of the third embodiment in which a perspective view is shown in FIG. 5A and a cross-sectional view in FIG. 5B, both ends of the cylindrical member 31 are used as the shaft heads 31a, 31b. In the portion of the member 31 parallel to the plane of the piezoelectric body 2 inserted into the through-hole 32 in the central portion of 31, a rod-shaped metal, such as steel, having a higher rigidity than the material of the member 31. The members 35a and 35b are disposed. In this third embodiment, the rod-shaped members 35a and 35b are arranged in a shape pushed inward from the surface of the member 31, or with the rotor 3c of the fourth embodiment shown in cross section in Fig. 5C. Similarly, the structure which adheres the rod-shaped members 36a and 36b to the outer surface of the member 31 may be sufficient. For example, in the third and fourth embodiments, the rod-shaped member may be provided only on one surface of the surface of the cross section. That is, only one of the upper and lower sides of the rod-shaped members 35a and 35b (or the rod-shaped members 36a and 36b) may be provided. In addition, the material of the rod-shaped members 35a, 35b, 36a, and 36b is not limited to metal, and a material having a higher bending rigidity than the member 31 may be used for the portions of 35a, 35b, 36a, and 36b. However, as the material having a much higher bending rigidity than the member 31 is used for the portions of 35a, 35b, 36a, and 36b, the ratio of the rod-shaped member can be reduced.

The rotating body 3d of the fifth embodiment shown in FIG. 6 is formed by injection molding two materials having different bending stiffnesses using, for example, a two-color molding machine. In this case, polyacetal is used as a part of 31, and a part of 37a and 37b is a resin material having a higher bending rigidity than polyacetal resin, for example, a composite resin material in which glass fiber or the like is reinforced with a resin such as polyacetal resin. It is preferable to use.

In the rotating body 3e according to the sixth embodiment showing a perspective view in FIG. 7A and a view in the direction of the rotation axis in FIG. 7B, the central portion 38 is formed in an I-shaped cross section like a railroad rail as shown in FIG. The shaft head parts 31a and 31b are arrange | positioned at the both ends. In this case, it is preferable to make the center part 38 and the shaft head parts 31a and 31b into injection molding using the same material. As shown in Fig. 7B, in the I-shaped cross section, since there are many parts in view of its shape, the bending stiffness can be drastically changed by varying the dimensions of each part as shown in the calculation example described later.

As described above in each of the above embodiments, the position where the piezoelectric member is fitted by the rotating body 3 in the knitting needle needle device of the present embodiment has only one point at the intermediate position of the rear end and the front end of the piezoelectric body 2. The curvature in the width direction of the piezoelectric body can be suppressed by making the axial cross-sectional structure of the rotating body into a special structure at the same time at only one point.

Next, the results of the test calculation of the change in the bending stiffness when the structure of the rotating body 3 is changed into a conventional circular shape, various ellipses and various I-shaped cross sections of the present invention are shown below.

formula

Circular cross-sectional area πd ^2/4

                          Ellipse π (0.5 x long diameter) (0.5 x short diameter)

                          Form I d · t + 2a (s + n) (see FIG. 7B)

Moment of inertia circular I = πd ^4/64

Ellipse I = π (0.5 x long diameter) ³ (0.5 x short diameter)

                          Type I g = (h-1) ÷ (b-t)

The results obtained by calculation were shown in Table 1, Table 2, and Table 3.

Table 1 shows the values of the cross-sectional area and the cross-sectional secondary moment (I) when the cross-sectional shape of the rotating body is a conventional circle and when various ellipses of the present invention are used. In addition, for convenience of calculation, the diameter in the case of the conventional circular cross section is made into 10 mm, and it calculates after a comparison with the case.

As is apparent from Table 1, in the case of a circle (conventional example), the cross-sectional area is 78.5 mm ² and I is 490. In the case of an ellipse, when the circle and the cross-sectional area are the same, and the short diameter is 8 mm (calculation example 2), it is only 1.17 times the case of a circle. If the short diameter is 6 mm (calculation example 3), I is 2.77 times and the bending rigidity is greatly improved.

Therefore, if the shorter diameter is 10mm, which is the same as the original (conventional example), and the amount of I improves by increasing the long diameter (Calculation Examples 4 and 5), I becomes 1.73 times at 12mm long and 2.74 times at 14mm long. .

Next, the shape dimensions of the calculation examples 6, 7, and 8 of the three examples in the case of I type cross section are shown in Table 2, and each cross-sectional area and I value are shown in Table 3.

The calculation example of the rotating body of I type cross section makes the cross sectional area substantially the same as the calculation example 1 (circular cross section) (calculation example 6), and the value of b, ie, I type cross section in the longitudinal direction of the piezoelectric body 2. The case where the length of the width was equal to the diameter of the calculation example 1 (calculation examples 7, 8) is shown.

From Table 3, it turned out that I value can significantly raise I value compared with using another cross section by using I type cross section in each example.

Next, samples of the rotating body of the prior art example and the present Example were made, the piezoelectric body was combined, respectively, and the vibration test according to the actual needle work was performed. A schematic perspective view of the used rotating body is shown in Figs. 10A, 10B and 10C.

The rotating body of FIG. 10A is a rotating body which has been widely used in the prior art as shown in FIG. 13, and the rotating body of FIG. 10B is a rotating body of the type that supports the piezoelectric body 2 shown in FIGS. 12A and 12B on both sides 5. 10C is an embodiment of the present invention showing a detailed structure in FIG. 5C, wherein the rod-shaped member 36a is disposed on both the upper and lower sides of the central portion 31.

In the experiment, each of the above-described rotating bodies was combined with a piezoelectric body to prepare three samples for Comparative Example 1 and Comparative Example 2 and Example showing the structure in FIG. Was performed. As the piezoelectric body 2, a 10 mm wide and 30 mm long one was used, and the rotating body 30 was molded from polyacetal resin, and the diameter thereof was 2.5 mm. In addition, the rod-shaped member 36a was made of stainless steel of 0.3 mm in diameter.

The test results obtained are shown in Table 4.

A. UP torque: Piezoelectric support torque when pushed down from upper amplitude position to center position

B. DW torque: Piezoelectric support torque when pushed up from the lower amplitude position to the center position

C. Total Stroke: Difference between Upper and Lower Amplitude

D. A × C: Product of UP torque and total stroke

E. B × C: Product of DW torque and total stroke

F. (D + E) / 2: mean of the product of each torque and the total stroke

Average value of F: Average value of F values of three samples

Difference: The difference between the maximum and minimum values of the F values of three samples

In the table, as the upper and lower average values of the product of the total stroke and torque indicated by F are larger, vibration in the width direction of the piezoelectric body is suppressed, and vibration in the longitudinal direction of the piezoelectric body is effectively exhibited.

From Table 4, it can be seen that the average value of F in the example is about 20% higher than the average value of F in Comparative Example 1, and the Example is significantly improved compared to Comparative Example 1 with respect to the deviation between the three samples. have.

When the rotor is interrupted in the width direction of the piezoelectric body as in Comparative Example 2, the suppression of vibration in the width direction when voltage is applied to the piezoelectric body is compared to Comparative Example 1 in which the rotor is continuous in the width direction. A significant drop compared to this was confirmed in this experiment.

When the present experiment was conducted, the relationship between the torque and the stroke was examined for each sample, and the results are shown in FIG. In the relation line between torque and stroke, the dotted line 1 showed the comparative example 1, the dashed-dotted line 2 showed the comparative example 2, and the solid line 3 showed the Example.

In Fig. 11, the larger the area of the lower side of the straight line showing the relationship between the torque and the stroke, the more the vibration in the width direction of the piezoelectric body is suppressed and the more effective the vibration in the longitudinal direction of the piezoelectric body becomes. In Fig. 11, the solid line 3 showing the relationship between the torque and the stroke of the embodiment is at the uppermost point, which proves that the piezoelectric body with the rotating body according to the present invention exhibits excellent results which are not found in the prior art in the vibration of the piezoelectric body. .

The case where the piezoelectric needle for knitting machine of the present invention uses one piezoelectric body has been described above. In practice, as can be easily understood by those skilled in the art, in a mass production knitting machine, one piezoelectric body is not used to be supported by a support, but for example, as illustrated in FIG. 9C, a plurality of piezoelectric elements are arranged in a layer form at intervals. The housing (the piezoelectric body of seven pieces in the case of FIG. 9C) is used. Therefore, the needle needle device for knitting machines in the present invention means a needle needle device in which at least one piezoelectric body is housed in a support or a housing.

Although the case where the knitting needle for needle knitting of the present invention is used as a circular knitting machine has been described as an example, the needle needle of the present invention can also be used for flat knitting machines.

Knitting device for knitting machine according to the present invention is registered as Japanese Patent No. 1969970 by the same applicant as the applicant of the present invention (see Japanese Patent Application Laid-open No. Hei 6-94619), registered as a corresponding US Patent USP 5,027,619 and excellent It is based on the knitting needle device which is widely used as a device. Moreover, since the rotating body which supports a piezoelectric body in the intermediate position is comprised so that the curvature of the piezoelectric body in the width direction may be less than the curvature of the piezoelectric body in the longitudinal direction, the piezoelectric body can be vibrated more efficiently.

As a result, the vibration speed of the piezoelectric body can be raised, and the improvement of productivity of the knitting machine can be achieved.

The present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, to apprise the scope of the present invention, the following claims are attached.

Claims (6)

And a plate-like piezoelectric body having a piezoelectric element and a finger movably installed in the same line as the piezoelectric body, and supporting the rear end portion of the piezoelectric body in a groove of a support or a housing so as to be rotatable in the groove. The front end portion is pivotably connected to the rear end portion of the finger, the intermediate position of the rear end portion of the piezoelectric element and the end portion of the piezoelectric member are fitted to a rotating body rotatably installed on a support or a housing, and the voltage is applied to the piezoelectric element. In the knitting needle tip device for operating a finger, thereby performing the needle needle of the knitting needle of the knitting machine, which enables the knitting of a letter of a predetermined pattern structure, The rotating body is composed of a central portion between the shaft head portion provided at both ends thereof and supported by a bearing provided in the support or the housing, and both shaft head portions, At least part of the width direction of the piezoelectric body of the center portion is provided with a slit for fitting the piezoelectric body, and the axial cross-sectional structure of the central portion in a plane perpendicular to the axis of the rotating body and perpendicular to the plane of the piezoelectric body is the piezoelectric body. The knitting device for knitting machines, characterized in that the curvature in the width direction of the piezoelectric member is suppressed to be smaller than the curvature in the longitudinal direction of the piezoelectric body. The method of claim 1, The cross section of the center portion has a length along the direction connecting the rear end portion and the tip portion of the piezoelectric body is shorter than the length along the thickness direction of the piezoelectric knitting needle needle device. The method of claim 2, The cross-sectional shape of the said central part is elliptical which makes the direction which connects the rear end part and the front end part of the said piezoelectric body into a short side, the knitting machine for knitting machines characterized by the above-mentioned. The method of claim 1, The knitting device for knitting machines, wherein the cross-sectional shape of the center portion is provided at a position apart from the slit in one or both of the top and bottom portions of the center portion. The method of claim 1, The center portion is formed of a material having different bending stiffness of two or more layers in its cross-sectional structure, and adopts a material having a higher bending stiffness than the material used for the portion close to the slit as the material used for the portion away from the slit. Knitting device for knitting machines characterized in that. The method of claim 5, A portion of the knitting machine for forming a knitting machine, wherein a portion away from the slit is formed of a rod-shaped member made of metal, and a portion close to the slit is formed of plastic.

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