Wherefore, we claim:
1. A ball-throwing machine of the type having a power head including three coacting wheels for propelling a ball toward a batter to interchangeably simulate pitches of different types to different locations at different speeds, said machine including means for computing the rotational speed of each of said wheels, the horizontal angular position of said power head, and the vertical angular position of said power head.
2. The ball-throwing machine of claim 1, wherein each of said different pitches may be established by five data points which correspond to the rotational speed of each of said wheels, said horizontal angular position of said power head, and said vertical angular position of said power head are all determined.
3. The ball-throwing machine of claim 1, wherein said means for computing said rotational speed of each of said wheels is determined by a mathematical formula that linearly is relates the speed of said wheels to the speed of said ball.
4. The ball-throwing machine of claim 1, wherein said means for computing said horizontal angular position of said power head is determined using a mathematical formula that linearly relates the horizontal angular position of said power head to the speed of said ball.
5. The ball-throwing machine of claim 1, wherein said means for computing said vertical angular position of said power head is determined using a mathematical formula that linearly relates the vertical angular position of said power head to the speed of said ball.
6. A ball-throwing machine of the type having a power head including three coacting wheels for propelling a ball toward a batter to interchangeably simulate pitches of different types to different locations at different speeds, said machine including:
means for computing the rotational speed of each of said wheels;
means for computing the horizontal angular position of said power head;
means for computing the vertical angular position of said power head;
means for causing said power head to rotate to said vertical angular position;
means for causing said power head to rotate to said horizontal angular position; and
means for causing each of said wheels to rotate at said rotational speed; and
means for controlling the rotational speed of each wheel, the horizontal angular position of the power head and the vertical angular position of the power head.
7. The ball-throwing machine of claim 6, wherein said rotational speed of each of said wheels is computed using a linear relationship with the speed of the ball.
8. The ball-throwing machine of claim 6, wherein said horizontal angular position of said power head is computed using a linear relationship with the speed of the ball.
9. The ball-throwing machine of claim 6, wherein said vertical angular position of said power head is computed using a linear relationship with the speed of the ball.
10. The ball-throwing machine of claim 6, wherein said means for controlling the rotational speed of each wheel includes a motor and a drive control, wherein said drive control includes means for rapidly changing the speed of each wheel.
11. The ball-throwing machine of claim 6, wherein said power head is pivotably mounted on a base at a center pivot about which the power head may be pivoted in both a horizontal and a vertical direction.
12. The ball-throwing machine of claim 11, wherein said means for causing the power head to move to a predetermined horizontal angular position comprises at least one horizontal linear actuator adapted to cause said power head to rotate in a horizontal plane about a center pivot and wherein said means for causing the power head to move to a predetermined vertical angular position comprises at least one vertical linear actuator adapted to cause said power head to rotate in a vertical plane about said center pivot.
13. The ball-throwing machine of claim 6, wherein said means for controlling comprises a programmable controller.
14. The ball-throwing machine of claim 13, wherein said programmable controller includes a programmable microprocessor.
15. The ball-throwing machine of claim 13 wherein said programmable microprocessor may be operated in a manual mode in which an individual can manually select for each pitch its type, speed and location or in an automatic mode in which the microprocessor is pre-programmed to deliver different pitches at different speeds to different locations in a pre-programmed sequence.
16. The ball-throwing machine of claim 13, wherein said programmable microprocessor includes a smart card reader adapted to read a pre-programmed smart card contains a pre-programmed sequence of pitches in order to re-program said microprocessor.
17. Method of establishing pitch parameters in a ball-throwing machine of the type having a power head including three coacting wheels for propelling a ball toward a batter to interchangeably simulate pitches of different types to different locations at different speeds, said method comprising the steps of:
computing the rotational speed of each of said wheels;
computing the horizontal angular position of said power head; and
computing the vertical angular position of said power head.
18. The method of establishing pitch parameters of claim 17, wherein said steps of computing the rotational speed of each of said wheels, computing the horizontal angular position of said power head and computing the vertical angular position of said power head are accomplished by providing a data table containing five data entries for each of said different pitches, three of said data entries being the rotational speeds of said wheels, one of said data entries being the horizontal angular position of said power head and one of said data entries being the vertical angular position of said power head.
19. The method of establishing pitch parameters of claim 18, wherein said data entries for the rotational speeds of said wheels are determined by a mathematical formula that linearly relates the speeds of said wheels to the speed of said ball.
20. The method of establishing pitch parameters of claim 18, wherein said data entries for the horizontal angular position of said power head is determined by a mathematical formula that linearly relates the horizontal angular position of said power head to the speed of said ball.
21. The method of establishing pitch parameters of claim 18, wherein said data entries for the vertical angular position of said power head is determined by a mathematical formula that linearly relates the vertical angular position of said power head to the speed of said ball.
22. A ball-throwing machine of the type having a power head including three coacting wheels for propelling a ball toward a batter to interchangeably simulate pitches of different types to different locations at different speeds, said machine including:
means for delivering said ball to a queued position;
means for computing the rotational speed of each of said wheels;
means for computing the horizontal angular position of said power head;
means for computing the vertical angular position of said power head;
means for causing said power head to rotate to said vertical angular position;
means for causing said power head to rotate to said horizontal angular position;
means for causing each of said wheels to rotate at said rotational speed;
means for controlling the rotational speed of each wheel, the horizontal angular position of the power head and the vertical angular position of the power head; and
means for impelling said ball from said queued position to said power head.
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 manufacturing method of a liquid discharge head having a liquid chamber which communicates with a discharge port for discharging a liquid, the method comprising:
etching a first Si layer of an SOI substrate by use of an insulating layer as an etching stop layer to form the liquid chamber at the first Si layer, the SOI substrate being constituted by the first Si layer, the insulating layer and a second Si layer layered in this order; and
removing a part or all of the second Si layer.
2. The manufacturing method of the liquid discharge head according to claim 1, wherein the SOI substrate in which the first Si layer is thinner than the second Si layer is used.
3. The manufacturing method of the liquid discharge head according to claim 1, further comprising:
joining the first Si layer to an orifice plate provided with the discharge port, after forming the liquid chamber and before removing the second Si layer.
4. The manufacturing method of the liquid discharge head according to claim 3, wherein when joining the first Si layer to the orifice plate, the first Si layer is joined to the orifice plate by one of direct joining and solid-phase joining via a metal film.
5. The manufacturing method of the liquid discharge head according to claim 1, further comprising:
forming, on the insulating layer, a piezoelectric element which generates energy to discharge the liquid from the discharge port, after removing the second Si layer.
6. A manufacturing method of a liquid discharge head having a liquid chamber which communicates with a discharge port for discharging a liquid, the method comprising:
etching a first Si layer of a first SOI substrate by use of a first insulating layer as an etching stop layer to form the discharge port at the first Si layer, the first SOI substrate being constituted by the first Si layer, the first insulating layer and a second Si layer layered in this order;
etching a third Si layer of a second SOI substrate by use of a second insulating layer as an etching stop layer to form the liquid chamber at the third Si layer, the second SOI substrate being constituted by the third Si layer, the second insulating layer and a fourth Si layer layered in this order; and
joining the first Si layer to the third Si layer so that the discharge ports communicate with the liquid chamber.
7. The manufacturing method of the liquid discharge head according to claim 6, further comprising:
after joining the first Si layer to the third Si layer,
removing a part or all of the fourth Si layer; and
forming, on the second insulating layer, a piezoelectric element which generates energy to discharge the liquid from the discharge ports.
8. The manufacturing method of the liquid discharge head according to claim 6, wherein when joining the first Si layer to the third Si layer, the first Si layer is joined to the third Si layer by one of direct joining and solid-phase joining via a metal film.
9. A manufacturing method of an orifice plate having a discharge port for discharging a liquid and a communication portion which communicates with the discharge port, the method comprising:
etching a first Si layer of a first SOI substrate by use of a first insulating layer as an etching stop layer to form the discharge port at the first Si layer, the first SOI substrate being constituted by the first Si layer, the first insulating layer and a second Si layer layered in this order;
etching a third Si layer of a second SOI substrate by use of a second insulating layer as an etching stop layer to form the communication portion at the third Si layer, the second SOI substrate being constituted by the third Si layer, the second insulating layer and a fourth Si layer layered in this order;
joining the first Si layer to the third Si layer; and
removing the second Si layer and the fourth Si layer.
10. The manufacturing method of the orifice plate according to claim 9, further comprising:
removing the first insulating layer and the second insulating layer, after removing the second Si layer and the fourth Si layer.
11. A manufacturing method of a liquid discharge head including an orifice plate having a discharge port for discharging a liquid and a communication portion which communicates with the discharge port, and a channel substrate provided with a liquid chamber which communicate with the communication portion, the method comprising:
etching a first Si layer of a first SOI substrate by use of a first insulating layer as an etching stop layer to form the discharge port at the first Si layer, the first SOI substrate being constituted by the first Si layer, the first insulating layer and a second Si layer layered in this order;
etching a third Si layer of a second SOI substrate by use of a second insulating layer as an etching stop layer to form the communication portion at the third Si layer, the second SOI substrate being constituted by the third Si layer, the second insulating layer and a fourth Si layer layered in this order;
joining the first Si layer to the third Si layer;
removing the fourth Si layer;
joining the third Si layer to the channel substrate so that the communication portion communicates with the liquid chambers; and
removing the second Si layer.