A method for a robot to automatically find a bending position, including the following steps: step 1, establishing a gripper tool coordinate system (TX, TY, TZ); step 2, determining a user coordinate system (X.sub.A, Y.sub.A, Z.sub.A; X.sub.B, Y.sub.B, Z.sub.B) of rear blocking fingers (11, 21); step 3, a robot gripper moving horizontally, and detecting the state of sensors (12, 22); step 4, the robot gripper executing a rotational movement, detecting the state of the sensors (12, 22), and thereby obtaining a standard bending position. The robot automatically finds the bending position, the teaching difficulty is reduced, and the bending quality is increased. In the elevator industry, elevator door plate bending sizes are the same, but forming sizes are different. In the present invention, only one product process needs to be taught in order to satisfy elevator door plate processing with different specifications, thereby reducing maintenance costs and increasing production efficiency.

A method for a robot to automatically find a bending position, including the following steps: step 1, establishing a gripper tool coordinate system (TX, TY, TZ); step 2, determining a user coordinate system (X.sub.A, Y.sub.A, Z.sub.A; X.sub.B, Y.sub.B, Z.sub.B) of rear blocking fingers (11, 21); step 3, a robot gripper moving horizontally, and detecting the state of sensors (12, 22); step 4, the robot gripper executing a rotational movement, detecting the state of the sensors (12, 22), and thereby obtaining a standard bending position. The robot automatically finds the bending position, the teaching difficulty is reduced, and the bending quality is increased. In the elevator industry, elevator door plate bending sizes are the same, but forming sizes are different. In the present invention, only one product process needs to be taught in order to satisfy elevator door plate processing with different specifications, thereby reducing maintenance costs and increasing production efficiency.

The end effector 10 includes a joint section 11 connected to a robotic arm 220, a working section 14 for performing work on an object 500, an actuator 40 is located between the joint section 11 and the working section 14 and moves the working section 14 in a first direction in which the joint section 11 and the working section 14 are aligned, a piezoelectric element 45 that drives an actuator 40.

A parallel-type gripper according to an embodiment of the present invention includes: a pair of jaws that are opposite to each other; and a parallel-type driving module in which the pair of jaws are movably connected in a horizontal direction such that they approach or move away from each other, and moving the pair of jaws in the horizontal direction so that the pair of jaws grip an object.

A parallel-type gripper according to an embodiment of the present invention includes: a pair of jaws that are opposite to each other; and a parallel-type driving module in which the pair of jaws are movably connected in a horizontal direction such that they approach or move away from each other, and moving the pair of jaws in the horizontal direction so that the pair of jaws grip an object.

Anthropomorphic hand comprising: a palm; a metacarpus; a thumb; four aligned fingers constrained to said palm, each comprising a proximal phalanx, a middle phalanx and a distal phalanx; a motor; a plurality of differential stages which transmit motion from said motor to said aligned fingers and to said thumb: a first stage whose planet carrier is moved by said motor and whose sun gears move planet carriers of a second and a fifth stage, sun gears of the second and fifth stages being integral to the planet carriers of a third and a fourth stage, whose sun gears move four gears having axes coincident with the axes of rotation between the aligned fingers and the palm; sun gears of the fifth stage being configured to rotate said metacarpus and a gear having axis coincident with the axis of rotation between the proximal phalanx of the thumb and the metacarpus.

Anthropomorphic hand comprising: a palm; a metacarpus; a thumb; four aligned fingers constrained to said palm, each comprising a proximal phalanx, a middle phalanx and a distal phalanx; a motor; a plurality of differential stages which transmit motion from said motor to said aligned fingers and to said thumb: a first stage whose planet carrier is moved by said motor and whose sun gears move planet carriers of a second and a fifth stage, sun gears of the second and fifth stages being integral to the planet carriers of a third and a fourth stage, whose sun gears move four gears having axes coincident with the axes of rotation between the aligned fingers and the palm; sun gears of the fifth stage being configured to rotate said metacarpus and a gear having axis coincident with the axis of rotation between the proximal phalanx of the thumb and the metacarpus.

[Problem] Provided is a link mechanism capable of moving a tip end part substantially straight by using a simpler structure. [Solution] A link mechanism including a first parallel link mechanism having a fixed link and an intermediate link parallel to each other, and a pair of side links parallel to each other, a second parallel link mechanism having a fixed link and an intermediate link parallel to each other, and a pair of side links parallel to each other, in which the fixed link is connected to the intermediate link of the first parallel link mechanism, a fixed structure that is formed including the intermediate link of the first parallel link mechanism and the fixed link of the second parallel link mechanism, and a coupling link that couples one of the side links of the first parallel link mechanism and one of the side links of the second parallel link mechanism.

[Problem] Provided is a link mechanism capable of moving a tip end part substantially straight by using a simpler structure. [Solution] A link mechanism including a first parallel link mechanism having a fixed link and an intermediate link parallel to each other, and a pair of side links parallel to each other, a second parallel link mechanism having a fixed link and an intermediate link parallel to each other, and a pair of side links parallel to each other, in which the fixed link is connected to the intermediate link of the first parallel link mechanism, a fixed structure that is formed including the intermediate link of the first parallel link mechanism and the fixed link of the second parallel link mechanism, and a coupling link that couples one of the side links of the first parallel link mechanism and one of the side links of the second parallel link mechanism.

A mechanical device for grasping an object includes a lower arm defining a proximal end portion, a distal end portion, an inner profile, and at least one track disposed along a portion of the lower arm between the proximal end portion and the distal end portion. An upper arm is pivotally connected to the lower arm, the upper arm defining a proximal end portion, a distal end portion, and an inner profile. An actuator is pivotally connected to the proximal end portion of the upper arm, the actuator including at least one protrusion slidably disposed within the track of the lower arm.