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US 12,438,026 B2Granted
Method for operating conveying system
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsYong-Jyu Lin, Fu-Hsien Li, Chen-Wei Lu, Chi-Feng Tung, Hsiang Yin Shen
Life of this patent
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Abstract
A method for operating a conveying system is provided. An overhead hoist transport (OHT) vehicle is provided, wherein the OHT vehicle includes a gripping member configured to grip and hold a carrier, and a receiver configured to receive a signal. The signal is transmitted to the receiver of the OHT vehicle. The OHT vehicle is moved toward the carrier, and the carrier is gripped by the gripping member of the OHT vehicle. A lifting force is determined based on a weight of a carrier, a number of workpieces in the carrier, or a vertical distance between the OHT vehicle and the carrier, and the lifting force is applied to the carrier.
Claims20
A method for operating a conveying system, comprising:
- positioning an overhead hoist transport (OHT) vehicle over a first load port;
- transmitting a first data to the OHT vehicle, wherein the first data includes information of a weight of a first carrier, a number of workpieces in the first carrier, and a first vertical distance between the OHT vehicle and the first carrier;
- applying a first lifting force to the first carrier on the first load port, wherein the first lifting force is determined based on the first data;
- positioning the OHT vehicle over a second load port;
- transmitting a second data to the OHT vehicle, wherein the second data includes information of a weight of a second carrier, a number of workpieces in the second carrier and a second vertical distance between the OHT vehicle and the second carrier;
- and
- applying a second lifting force to the second carrier on the second load port, wherein the second lifting force is determined based on the second data, and the first lifting force is different from the second lifting force,
- wherein the first lifting force is a minimum force required to lift the first carrier calculated by a control unit of the OHT vehicle, and the second lifting force is a minimum force required to lift the second carrier calculated by the control unit.
5 more elements
A method for operating a conveying system, comprising:
- providing an overhead hoist transport (OHT) vehicle including a gripping member, a control unit, and a receiver;
- positioning the OHT vehicle over a first load port;
- transmitting a first data to the receiver of the OHT vehicle, wherein the first data includes
- information of a weight of a first carrier, a number of workpieces in the first carrier, and a first vertical distance between the OHT vehicle and the first carrier;
- applying a first minimum force to the first carrier on the first load port, wherein the first minimum force is determined based on the first data, comprising:
- gripping the first carrier by the gripping member;
- and
- calculating the first minimum force applied to the first carrier by the gripping member based on the information of the first data by the control unit;
- positioning the OHT vehicle over a second load port;
- transmitting a second data to the receiver of the OHT vehicle, wherein the second data includes information of a weight of a second carrier, a number of workpieces in the second carrier, and a second vertical distance between the OHT vehicle and the second carrier;
- and
- applying a second minimum force to the second carrier on the second load port, wherein the second lifting force is determined based on the second data, comprising:
- gripping the second carrier by the gripping member;
- and
- calculating a second minimum force applied on the second carrier by the gripping member based on the information of the second data by the control unit,
- wherein the first minimum force is different from the second minimum force.
13 more elements
A method for operating a conveying system, comprising:
- positioning an overhead hoist transport (OHT) vehicle over a first carrier, wherein the first carrier is on a first load port;
- transmitting a first data to the OHT vehicle, wherein the first data includes information of a weight of the first carrier, a number of workpieces in the first carrier, and a first vertical distance between the OHT vehicle and the first carrier;
- calculating a first minimum force for lifting the first carrier by a control unit of the OHT vehicle based on the first data;
- applying the first minimum force to the first carrier;
- positioning the OHT vehicle over a second carrier, wherein the second carrier is on a second load port;
- and
- transmitting a second data to the OHT vehicle, wherein the second data includes information of a weight of the second carrier, a number of workpieces in the second carrier and a second vertical distance between the OHT vehicle and the second carrier, wherein a total weight of the second carrier and the workpieces in the second carrier is different from a total weight of the first carrier and the workpieces in the first carrier;
- calculating a second minimum force for lifting the second carrier by the control unit of the OHT vehicle based on the second data;
- and
- applying the second minimum force to the second carrier, wherein the first minimum force is different from the second minimum force.
7 more elements
Dependencies are inferred from the claim text.