1. A tuning peg element for a stringed musical instrument having a wooden peg box, comprising:
a conical fixing part by means of which the tuning peg element is fixable to the peg box in rotatable manner without further auxiliary means and which is of solid construction and is made of a non-fibrous material at least in a region of contact with the peg box.
2. A tuning peg element in accordance with claim 1, wherein the surface pressure on the fixing part is between 3.1 Nmm2 and 4.3 Nmm2 when the tuning peg element is fixed to the peg box.
3. A tuning peg element in accordance with claim 1, wherein the end face of the fixing part is free of recesses.
4. A tuning peg element in accordance with claim 1, wherein a front end face is formed on the fixing part.
5. A tuning peg element in accordance with claim 4, wherein the front end face is closed.
6. A tuning peg element in accordance with claim 4, wherein the front end face is formed by the solid material of the fixing part.
7. A tuning peg element in accordance with claim 1, wherein the fixing part has a region of contact with the peg box which substantially corresponds to that region of the surface which is positioned in a bore in the peg box.
8. A tuning peg element in accordance with claim 1, wherein the fixing part is workable by a tuning peg cutter.
9. A tuning peg element in accordance with claim 8, one or more basic models being provided, from which tuning peg elements of at least one of differing conical slopes and different sizes are producible by means of a tuning peg cutter.
10. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the moment of static friction of the fixing part on the peg box and the moment of sliding friction differ by at most 40%.
11. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the moment of static friction of the fixing part on the peg box and the moment of sliding friction differ by at most 30%.
12. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the moment of static friction of the fixing part on the peg box and the moment of sliding friction differ by at most 20%.
13. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the moment of static friction of the fixing part on the peg box is smaller than 400 Nmm.
14. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the moment of sliding friction of the fixing part on the peg box is greater than 300 Nmm.
15. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of static friction differs by at most 25% from the coefficient of sliding friction.
16. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of static friction with lubrication differs by at most 15% from the coefficient of sliding friction.
17. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of static friction is smaller than 0.22 without lubrication.
18. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of sliding friction is smaller than 0.18 without lubrication.
19. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of static friction with lubrication is smaller than 0.12.
20. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a material which is such that the coefficient of sliding friction with lubrication is smaller than 0.11.
21. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of polyamide.
22. A tuning peg element in accordance with claim 1, wherein the fixing part is formed in one piece.
23. A tuning peg element in accordance with claim 1, said tuning peg element being a one piece construction.
24. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made of a synthetic material.
25. A tuning peg element in accordance with claim 1, wherein at least the region of contact of the fixing part is made by means of an injection moulding process.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A high efficiency piezoelectric single phase uni-polar ultrasonic actuator comprising:
an upper and lower pair of back discs,
a PZT plate interposed between said upper and lower back discs,
an electrode formed on said PZT plate,
a pivotal bolt extending through said upper and lower pair of back discs, and said PZT plate, and
a fixing nut secured to one end of said pivotal bolt, said actuator unit is being supported and fixed with said pivotal bolt and said fixing nut combination by passage of said pivotal bolt coaxially through the center of said actuator unit wherein parametric output variation of said actuator is carried out by asymmetrizing the structure of said actuator by a formation of at least one straight notch having a screw coupled to said upper disc within said notch on an edge of said upper disc such that after said electrode being energized, said actuator produces an unbalanced periodic output force.
2. The actuator as in claim 1, wherein said parametric output variation is carried out by varying number, size (including width and depth), and a location of notch and screw combinations made along the edge of said upper disc.
3. The actuator as in claim 1, wherein the diameter of said PZT plate and said back discs, and the distance from said pivotal bolt to a driving point are variable, said pivotal bolt is formed of friction resistant hardened chromium, and the direction of a driving force is axial, or transverse, or combination of the two.
4. A high efficiency piezoelectric single phase uni-polar ultrasonic actuator comprising:
an upper and lower pair of back discs,
a PZT plate interposed between said upper and lower back discs,
an electrode formed on said PZT plate,
a pivotal bolt extending through said upper and lower pair of back discs, and said PZT plate, and
a fixing nut secured to one end of said pivotal bolt, said actuator unit is being supported and fixed with said pivotal bolt and said fixing nut combination by passage of said pivotal bolt eccentrically through a portion of said actuator unit wherein parametric output variation of said actuator is carried out by asymmetrizing the structure of said actuator by a formation of at least one straight notch having a screw coupled to said upper disc within said notch on an edge of said upper disc such that after said electrode being energized, said actuator produces an unbalanced periodic output force.
5. The actuator as in claim 4, wherein said parametric output variation is carried out by a varying number, size (including width and depth), and a location of said at least one straight notch and screw combination made along the edge of said upper disc.
6. The actuator as in claim 4, wherein said at least one straight notch and screw combination are separated with an equal angular distance.
7. The actuator as in claim 4, wherein the diameter of said PZT plate and said back discs, and the distance from said pivotal bolt to a driving point are variable, said pivotal bolt is formed of friction resistant hardened chromium, and the direction of a driving force is axial, or transverse, or combination of the two.