What is claimed is:
1. In a round brilliant cut design of an ornamental diamond,
a cut design providing plenty of visual-perceptible reflection, comprising:
a substantially round or polygonal girdle having an upper horizontal section and a lower horizontal section parallel to the upper horizontal section;
a crown above the upper horizontal section of the girdle having a table facet and at least one crown main facet; and
a pavilion below the lower horizontal section of the girdle having at least one pavilion main facet,
wherein a girdle height (h) between the upper and the lower horizontal sections of the girdle is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) between the pavilion main facet and the lower horizontal section of the girdle ranges from 37.5 degrees to 41 degrees and a crown angle (c) between the crown main facet and the upper horizontal section of the girdle is within a range of satisfying the following equations:
c>2.8667p134.233 and p<(sin1(1n)sin1(1nsin c))1801802c,
wherein
n: refraction index of a diamond,
: circular constant,
p: pavilion angle in degrees, and
c: crown angle in degrees.
2. A cut design providing plenty of visual-perceptible reflection as set forth in claim 1, wherein the girdle height (h) is 0.030 to 0.15 times the girdle radius.
3. A cut design providing plenty of visual-perceptible reflection as set forth in claim 1, wherein a table diameter is 0.45 to 0.60 times a girdle diameter.
4. A cut design providing plenty of visual-perceptible reflection as set forth in claim 2, wherein a table diameter is 0.45 to 0.60 times a girdle diameter.
5. In a cut design of an ornamental diamond,
a cut design providing plenty of visual-perceptible reflection, comprising:
a substantially round or polygonal girdle having an upper horizontal section surrounded by an upper periphery and a lower horizontal section, parallel to the upper horizontal section, surrounded by a lower periphery;
a crown of a nearly polygonal truncated pyramid formed upward above the upper horizontal section of the girdle having a regular octagonal table facet at the top of the polygonal truncated pyramid, eight crown main facets, eight star facets and sixteen upper girdle facets; and
a pavilion of a nearly polygonal pyramid formed downward below the lower horizontal section of the girdle having eight pavilion main facets and sixteen lower girdle facets,
wherein a center axis stands from a center apex of the pavilion polygonal pyramid through a center of the table facet; first planes each runs from the center axis through each of eight vertexes of the table facet; and second planes each runs from the center axis and divides an angle between the two neighboring first planes into two equal angles,
wherein each of the crown main facets is a rectangular plane surface having two opposite vertexes, one being one of vertexes of the table facet and the other being a cross point of the upper periphery of the girdle with a first plane passing the vertex of the table facet,
the rectangular plane surface having other two opposite vertexes each positioned on a neighboring second plane and coinciding with a vertex of a neighboring crown main facet;
each of the star facets is a triangle having a base coinciding with a side of the table facet and a vertex coinciding with a coinciding vertex of two neighboring crown main facets each having a side passing each of the both ends of the base;
each of the upper girdle facets is a triangle having a side coinciding with one of sides of a crown main facet and crossing the upper periphery of the girdle at an end of the side and a vertex at which a second plane passing the other end of the side crosses the upper periphery of the girdle;
each of the pavilion main facets is a rectangular plane surface having two opposite vertexes, one being a cross point of a second plane with the lower periphery of the girdle and the other being at the center apex of the pavilion polygonal pyramid,
the rectangular plane surface having other two opposite vertexes each positioned on a neighboring first plane, the pavilion main facets each having a side coinciding with a side of a neighboring pavilion main facet and two vertexes coinciding with two vertexes of the neighboring pavilion main facet; and
each of the lower girdle facets is a triangle having a side coinciding with a side of one of the pavilion main facets and crossing the lower periphery of the girdle at an end of the side and a vertex at which the first plane passing the other end of the side crosses the lower periphery of the girdle,
wherein a girdle height (h) between the upper and the lower horizontal sections of the girdle is 0.026 to 0.3 times a girdle radius; a pavilion angle (p) between the pavilion main facet and the lower horizontal section of the girdle ranges from 37.5 degrees to 41 degrees; and a crown angle (c) between the crown main facet and the upper horizontal section of the girdle is within a range of satisfying the following equations:
c>2.8667p134.233 and p<(sin1(1n)sin1(1nsin c))1801802c,
wherein
n: refraction index of a diamond,
: circular constant,
p: pavilion angle in degrees, and
c: crown angle in degrees.
6. A cut design providing plenty of visual-perceptible reflection as set forth in claim 5, wherein the girdle height (h) is 0.030 to 0.15 times the girdle radius.
7. A cut design providing plenty of visual-perceptible reflection as set forth in claim 5, wherein a table diameter is 0.45 to 0.60 times a girdle diameter.
8. A cut design providing plenty of visual-perceptible reflection as set forth in claim 6, wherein a table diameter is 0.45 to 0.60 times a girdle diameter.
9. An observation method of an ornamental diamond, comprising:
providing an ornamental diamond of a round brilliant cut which comprises a substantially round or polygonal girdle having an upper horizontal section and a lower horizontal section parallel to the upper horizontal section, a crown on the upper horizontal section of the girdle having a table facet and at least one crown main facet, and a pavilion below the lower horizontal section of the girdle having at least one pavilion main facet, wherein a girdle height (h) between the upper and the lower horizontal sections of the girdle is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) between the pavilion main facet and the lower horizontal section of the girdle ranges from 37.5 degrees to 41 degrees, and a crown angle (c) between the crown main facet and the upper horizontal section of the girdle is within a range of satisfying the following equations:
c>2.8667p134.233 and p<(sin1(1n)sin1(1nsin c))1801802c,
wherein
n: refraction index of a diamond,
: circular constant,
p: pavilion angle in degrees, and
c: crown angle in degrees and
observing, above the table facet of the diamond, lights coming into the diamond through the table facet and crown facets including the crown main facets, star facets and crown girdle facets and emitted from the table facet and the crown facets with a sight line having an angle less than 20 degrees with a vertical line at the center of the table facet.
10. An observation method as set forth in claim 9, wherein the lights coming into the diamond is at an angle ranging from 10 degrees to 50 degrees with the vertical line at the center of the table facet.
11. An observation method as set forth in claim 10, wherein the lights coming into the diamond is at an angle ranging from 20 degrees to 45 degrees with the vertical line at the center of the table facet.
12. An observation method as set forth in claim 9, wherein the diamond has a girdle height (h) of 0.030 to 0.15 times the girdle radius.
13. An observation method as set forth in claim 9, wherein the diamond has a table diameter of 0.45 to 0.60 times a girdle diameter.
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 stapler apparatus comprising:
a fixed frame;
a movable frame pivotably mounted to the fixed frame;
a staple driving device disposed on one of the fixed frame and the movable frame;
a staple bending device to bend the leading ends of staples, the staple bending device disposed on the other of the fixed frame and the movable frame;
a drive mechanism to reciprocally move the movable frame with respect to the fixed frame to clamp a stack of sheets between the fixed frame and the movable frame;
a transmission member movably supported on the movable frame at a first mounting location, the transmission member being free to move about the first mounting location without restriction by the fixed frame at any point of the transmission member spaced from the first mounting location, and
an urging member disposed to bias the transmission member with respect to the movable frame, the transmission member being coupled to the drive mechanism such that the drive mechanism engages and moves the transmission member with respect to the movable frame, thereby overcoming the bias of the urging member, to compensate for a stack height of the stack of sheets clamped between the fixed frame and the movable frame.
2. The stapler apparatus of claim 1, wherein the transmission member is rotatably supported on the movable frame such that the transmission member can rotate with respect to the movable frame.
3. The stapler apparatus of claim 1, wherein the drive mechanism includes a drive cam.
4. The stapler apparatus of claim 1, wherein the transmission member includes an abutting portion configured to abut a protrusion on the movable frame, and wherein the urging member biases the abutting portion toward engagement with the protrusion on the movable frame.
5. The stapler apparatus of claim 4, wherein when the bias of the urging member is overcome, the abutting portion disengages the protrusion on the movable frame.
6. The stapler apparatus of claim 1, further comprising an activating member reciprocated by the drive mechanism and abutting the transmission member to move the transmission member.
7. The stapler apparatus of claim 1, wherein the urging member includes a spring connected to the transmission member and the movable frame.
8. The stapler apparatus of claim 1, wherein the transmission member includes a pair of transmission members positioned on opposite sides of the fixed frame.
9. The stapler apparatus of claim 1, further comprising a second urging member connected to the movable frame and the fixed frame to bias the movable frame with respect to the fixed frame.
10. The stapler apparatus of claim 1, wherein the transmission member is movably supported on the movable frame without any connection utilizing an elongated slot.
11. A stapler apparatus comprising:
a fixed frame;
a movable frame pivotably mounted to the fixed frame;
a staple driving device disposed on one of the fixed frame and the movable frame;
a staple bending device to bend the leading ends of staples, the staple bending device disposed on the other of the fixed frame and the movable frame;
a drive mechanism to reciprocally move the movable frame with respect to the fixed frame to clamp a stack of sheets between the fixed frame and the movable frame;
a transmission member movably supported on the movable frame without any connection utilizing an elongated slot, and
an urging member disposed to bias the transmission member with respect to the movable frame, the transmission member being coupled to the drive mechanism such that the drive mechanism engages and moves the transmission member with respect to the movable frame, thereby overcoming the bias of the urging member, to compensate for a stack height of the stack of sheets clamped between the fixed frame and the movable frame.
12. The stapler apparatus of claim 11, wherein the transmission member is rotatably supported on the movable frame such that the transmission member can rotate with respect to the movable frame.
13. The stapler apparatus of claim 11, wherein the drive mechanism includes a drive cam.
14. The stapler apparatus of claim 11, wherein the transmission member includes an abutting portion configured to abut a protrusion on the movable frame, and wherein the urging member biases the abutting portion toward engagement with the protrusion on the movable frame.
15. The stapler apparatus of claim 14, wherein when the bias of the urging member is overcome, the abutting portion disengages the protrusion on the movable frame.
16. The stapler apparatus of claim 11, further comprising an activating member reciprocated by the drive mechanism and abutting the transmission member to move the transmission member.
17. The stapler apparatus of claim 1, wherein the urging member includes a spring connected to the transmission member and the movable frame.
18. The stapler apparatus of claim 1, wherein the transmission member includes a pair of transmission members positioned on opposite sides of the fixed frame.
19. The stapler apparatus of claim 1, further comprising a second urging member connected to the movable frame and the fixed frame to bias the movable frame with respect to the fixed frame.
20. The stapler apparatus of claim 1, wherein the transmission member is movably supported on the movable frame at a first mounting location, the transmission member being free to move about the first mounting location without restriction by the fixed frame at any point of the transmission member spaced from the first mounting location.