JPH0359186B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a seat-shaped piezoelectric element that is incorporated into a circular knitting machine such as an electronic patterned circular knitting machine or a sock knitting machine. This invention relates to an incorporated piezoelectric needle selection device for knitting machines.

(Prior Art) A needle selection device for a knitting machine that has already been proposed and is incorporated into a circular knitting machine such as an electronic patterning circular knitting machine or a sock knitting machine is shown in FIGS. 9 and 10. (Utility Model Application No. 63-167187).

That is, as shown in FIGS. 9 and 10,
The outer periphery of the knitting machine cylinder 1, which is rotatably provided on the base of the circular knitting machine, has many vertical grooves (needle grooves).
2 are formed in the axial direction, and a jack 3 having each butt 3a is slidably fitted into each longitudinal groove 2 so as to move a knitting needle (not shown) up and down. Further, a box-shaped support frame 4 is fixed to the base (machine frame main body) near the knitting machine cylinder 1 with respective mounting bolts 5.
As shown in FIG. 10, on the back plate 6 of the support frame 4, a pair of flat plate-shaped piezoelectric elements 7 and 8 are cantilevered in the axial direction of the knitting machine cylinder 1. They are arranged horizontally. Further, each free end of each of the piezoelectric elements 7, 8 forms a pair of upper and lower gripping portions 7a, 8a having a semicircular arc shape. One end 9a of 9 is held between the top and bottom.

That is, a plurality of needle selection levers 9 are pivotally attached to the support frame 4 in the vicinity of the jack 3 having each of the butts 3a so as to be able to swing vertically around a pin shaft 10. One end 9 of the needle selection lever 9
a is held between the upper and lower sides by the above-mentioned holding parts 7a and 8a, and at the other end of this needle selection lever 9, there is a selection finger 9b made of a hard material such as cemented carbide or fine ceramics. It is attached so as to selectively push each butt 3a of the jack 3. Further, a pair of upper and lower stoppers 11a and 11b are provided on the support frame 4 near each clamping portion of each of the piezoelectric elements 7 and 8 to allow vertical movement of each free end of each of the piezoelectric elements 7 and 8. It is formed to regulate the

Therefore, the needle selection device for a knitting machine using the piezoelectric elements 7 and 8 described above is installed on the outer periphery of the knitting machine cylinder 1 while the knitting machine cylinder 1 rotates at high speed when the circular knitting machine is operated. A number of jacks 3 also rotate.

On the other hand, by applying a pulse signal to each of the piezoelectric elements 7 and 8 based on a patterning signal inputted in advance to a patterning control device (not shown) of the circular knitting machine, one piezoelectric element The piezoelectric element 7 alternately expands and contracts in response to an electric signal at the resonant frequency of the positive electrode (+) to produce flexural vibration in the vertical direction, and the other piezoelectric element 8 alternately expands and contracts in response to an electric signal at the resonant frequency of the cathode (-). Because flexural vibration occurs in the vertical direction,
These clamping parts 7a and 8a swing the needle selection lever 9 upward and downward around the pin shaft 10, so that the selection finger 9b of the needle selection lever 9
By selectively pushing each butt 3a of the jack 3, knitting needles (not shown) are slid in the vertical direction, thereby creating a pattern in stockinette knitting.

(Problem to be Solved by the Invention) However, since the above-mentioned needle selection device for a knitting machine is composed of extremely thin plate-shaped piezoelectric elements 7 and 8, it is susceptible to operating stress over a long period of time. It is difficult to withstand, and there is a risk of breakage or breakage due to long-term use due to vibration.In addition, the amount of displacement to move the butt from the selected position to the non-selected position cannot be obtained, and furthermore, the selected position and the non-selected position cannot be moved. It lacks the holding force with the selected position, making it impossible to obtain an effective and appropriate high speed, resulting in unstable operation (chattering operation), causing "pattern pattern irregularity phenomenon" and making it difficult to improve quality. .

The present invention has been made in view of the above-mentioned circumstances, and at the same time converts the electrical energy of each laminated piezoelectric element into mechanical energy, and at the same time expands and displaces the operation of this mechanical energy. By making the piezoelectric element sufficiently resistant to high-speed operation, and sufficiently expanding the amount of displacement that moves the butt from the selected position to the non-selected position, the expansion operation is made stable and reliable at high speed. Pattern pattern disturbance phenomenon”
It is an object of the present invention to provide a piezoelectric needle selection device for a knitting machine that prevents this and improves quality.

[Structure of the idea]

(Means and Effects for Solving the Problems) The present invention is characterized in that each jack is fitted into a knitting machine cylinder so as to move each knitting needle up and down, and each jack is connected to a needle selection lever provided near the knitting machine cylinder. In a circular knitting machine, a support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders are attached to a part of the support frame. Each hinge portion is formed in a part of the above-mentioned holding bodies that are arranged in parallel in the axial direction of the cylinder and located inside the above-mentioned support frame, and each support is formed on both the above-mentioned holding bodies beside each hinge portion. a laminated piezoelectric element is interposed between each of the supporting parts and each of the distal end jaws of both of the above-mentioned holders, and each actuator and each of the magnet members are disposed at each of the distal ends of both of the above-mentioned holders. By attaching the needle selection lever so as to push it alternately, providing each stopper on the outside of both the holders, and alternately applying a pulse voltage to each of the laminated piezoelectric elements, each of the laminated piezoelectric elements At the same time, the electric energy of the element is converted into mechanical energy, and the operation of this mechanical energy is expanded and displaced to alternately push the needle selection lever, thereby making each of the laminated piezoelectric elements move at high speed. be able to withstand it sufficiently,
The displacement amount for moving the butt from the selected position to the non-selected position is sufficiently expanded, and the expansion operation is performed at high speed and stably and reliably, thereby preventing irregularities in pattern development and improving quality. It is.

(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

Note that the present invention will be described with the same reference numerals assigned to the same constituent members as in the specific example described above.

1 to 7, reference numeral 1 denotes a knitting machine cylinder rotatably provided on the base of a circular knitting machine, and the outer periphery of this knitting machine cylinder 1 has many vertical grooves (needle grooves). 2 are formed in the axial direction, and a jack 3 having each butt 3a is slidably fitted into each longitudinal groove 2 so as to move a knitting needle (not shown) up and down. Further, a box-shaped support frame 4 is fixed to the base (machine frame main body) near the upper and lower knitting machine cylinder 1 with respective mounting bolts 5, and a back plate 6 of this support frame 4
As shown in FIGS. 2 to 7, at least a pair of upper and lower holders 20 and 21 are cantilevered and arranged horizontally in parallel with respect to the axial direction of the knitting machine cylinder 1, Both holders 20 and 21 are provided so that the length of the mounting position can be adjusted with each mounting nut 22 via an adjusting cylinder. moreover,
As shown enlarged in FIGS. 4 and 6, the holder 20 inside the back plate 6 of the support member 4,
In the middle of 21, each hinge part 20a, 21a is formed with each cut groove so as to serve as a fulcrum. , each support portion 20b, 2
1b is formed so as to be the focal point. Furthermore, each of the supporting jaws 20c, 2 is provided on the holder 20, 21 beside each of the supporting parts 20b, 21b.
1c is formed, and both the above-mentioned holding bodies 20, 21
Each tip jaw portion 20 is attached to both tip portions 20d and 21d of the
e, 21e are formed. In addition, these tip jaws 20e, 21e and the supporting jaws 20c, 21
Laminated piezoelectric elements 23 and 24 having respective lead wires 23a and 24a are interposed between the cassette c and the laminate piezoelectric elements 23 and 24 so as to be back to back to each other. By applying a
21 is designed to swing vertically alternately with the support parts 20b, 21b as the point of effort and the hinge parts 20a, 21a as the fulcrum, and the fulcrum of each of the hinge parts 20a, 21a and each of the above When the distance between the support parts 20b and 21b and the force point is "1", the distance from the fulcrum of each hinge part 20a and 21a to each actuator 25 and 26, which will be described later, becomes an enlargement ratio of about 16 times. The operating range of actuators 25 and 26 is widened.

On the other hand, both ends 20 of the above-mentioned both holders 20 and 21
d, 21d are each formed with a notch step,
Each actuator 25, 26 is screwed into each of the cutout steps so as to be substantially orthogonal to the longitudinal direction of the holders 20, 21. Moreover, both the above-mentioned holders 20 and 21 beside the actuators 25 and 26
Each magnet member 27, 28 is buried in the
Each end face of each of the magnet members 27, 28 is recessed slightly inwardly than each end face of each actuator 25, 26, and is buried therein. Furthermore, both the holding bodies 20, 2
Each of the stoppers 29, 3 coated with a vibration-absorbing material is provided on the support frame 4 on the outside of both end portions 20d, 21d of 1.
0 is provided so as to restrict the swing range of both the holding bodies 20, 21, and each of the stoppers 29, 30
is designed to absorb impact noise during operation.

On the other hand, a plurality of needle selection levers 31 are provided on the support frame 4 near the jack 3 having the butt 3a.
is pivotally mounted by a pin shaft 32 so as to be swingable in the vertical direction, and one end 31 of this needle selection lever 31
a extends on the swing path of each of the actuators 27 and 28, and is connected to the other end 31 of the needle selection lever 31.
b is attached to selectively push the butt 3a.

Hereinafter, the effects of the present invention will be explained.

Therefore, when the circular knitting machine is in operation, the knitting machine cylinder 1 rotates at high speed, and the numerous jacks 3 attached to the outer periphery of the knitting machine cylinder 1 also rotate.

On the other hand, a pulse signal is alternately applied to each of the laminated piezoelectric elements 23 and 24 based on a pattern signal inputted in advance to a pattern control device (not shown) of the circular knitting machine. One of the laminated piezoelectric elements 23 is alternately expanded and contracted by an electrical signal of the positive (+) resonance frequency, so the holding bodies 20 and 21 that hold each of the laminated piezoelectric elements 23 and 24
The actuators 25 and 26 swing vertically alternately with the support parts 20b and 21b as the points of effort and the hinge parts 20a and 21a as the fulcrums. It operates greatly within the operating range depending on the magnification ratio.

At this time, the other laminated piezoelectric element 24 is alternately expanded and contracted by the electric signal of the resonance frequency of the cathode (-), and the magnetic members 27 and 28 alternately attract the needle selection levers 31. , each needle selection lever 31 swings upward and downward around a pin shaft 32, and the other end (select finger) 31b of this needle selection lever 31 selectively selects each butt 3a of the jack 3. As it is pushed, knitting needles (not shown) are slid in the vertical direction, thereby creating a pattern in the stockinette knitting.

In this way, the present invention provides each actuator 25, 26
The needle selection lever 3 is configured to operate at a magnification ratio of about 16 times.
1 can be increased. In other words, the expansion and contraction movement (displacement) of each of the laminated piezoelectric elements 23 and 24 itself caused by alternately applying pulse signals to each of the laminated piezoelectric elements 23 and 24 is approximately 15 to 40 microns. However, the present invention utilizes the expansion and contraction motion of each laminated piezoelectric element 23, 24 to move both holders 20, 21 to their respective hinge portions 20a, 2.
Since the actuators 25 and 26 are oscillated at 1a, the operating range of each of the actuators 25 and 26 can be greatly increased by an enlargement ratio of approximately 16 times.

Next, in another embodiment of the present invention shown in FIG.
The positions of 0a and 21b are formed close to the axes of the holding frames 20 and 21, and this also has the same configuration as the specific example described above.

It goes without saying that the mounting positions of each actuator and each magnet member of the present invention may be interchanged with each other.

〔Effect of the invention〕

As described above, according to the present invention, each jack is fitted into the knitting machine cylinder so as to move each knitting needle up and down, and each jack is selectively operated by a needle selection lever provided near the knitting machine cylinder. In a push circular knitting machine, a support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders is attached to a part of the support frame so that the axis of the knitting machine cylinder is centered. Each hinge part is formed in a part of the above-mentioned both holding bodies which are arranged side by side in the direction and located inside the above-mentioned support frame body, and each supporting part is formed in both the above-mentioned holding bodies beside each hinge part. , each laminated piezoelectric element is interposed between each of these supporting parts and each of the tip jaws of both of the above-mentioned holders, and each actuator and each magnet member are attached to each of the tips of both of the above-mentioned holders and connected to the needle selection lever. are attached so as to be pushed alternately, each stopper is provided on the outside of both the above-mentioned holding bodies, and a pulse voltage is alternately applied to each of the above-mentioned laminated piezoelectric elements, thereby reducing the electric energy of each of the above-mentioned laminated piezoelectric elements. is converted into mechanical energy, and at the same time, the movement of this mechanical energy is expanded and displaced to alternately push and move the needle selection lever, so the amount of displacement to move the button from the selected position to the non-selected position is Not only can the image be sufficiently enlarged, but also a stable and reliable enlarging operation can be performed at high speed, which has excellent effects such as preventing irregularities in pattern placement and improving quality.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main parts of the piezoelectric needle selection device for knitting machines of the present invention, FIG. 2 is a longitudinal sectional view of the same, FIG. 3 is a front view of the same, and FIG. Exploded slope views, FIGS. 5 to 7 are diagrams for explaining the operation of the present invention, FIG. 8 is a diagram showing another embodiment of the present invention, and FIG. 9 is a diagram showing an already proposed embodiment. FIG. 10 is a plan view showing the main parts of the piezoelectric needle selection device for a knitting machine, and is a longitudinal cross-sectional view of the same. 1...knitting machine cylinder, 3...jack, 4...
...Support frame body, 20, 21...Holding body, 20a, 2
1a...hinge part, 20b, 21b...support part,
23, 24...Laminated piezoelectric element, 25, 26...
Actuator, 27, 28... Magnet member, 29, 30...
...Stopper, 31...needle selection lever.

Claims (1)

[Claims] 1. In a circular knitting machine in which each jack is fitted into a knitting machine cylinder so as to move each knitting needle up and down, and each jack is selectively pushed by a needle selection lever provided near the knitting machine cylinder. , a support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders are arranged side by side in a part of the support frame in the axial direction of the knitting machine cylinder, and the support Each hinge part is formed in a part of the above-mentioned both holding bodies located inside the frame, each supporting part is formed in both the above-mentioned holding bodies beside each hinge part, and each of these supporting parts and the above-mentioned both holding bodies are formed. A laminated piezoelectric element is interposed between each tip jaw of the holder, and each actuator and each magnet member are attached to each tip of each of the holders so as to alternately push the needle selection lever. , wherein each stopper is provided on the outside of both the holding bodies, and the needle selection lever is alternately pushed by applying a pulse voltage alternately to each of the laminated piezoelectric elements. Machine piezoelectric needle selection device.