Screwing apparatus and method of controlling screwing operation
View Patent ↗A screwing apparatus includes a support member having a horizontal support surface. A single urging member has an urging surface opposed to the support surface. The urging surface is set parallel to the support surface. A driving mechanism is configured to drive at least one of the support member and the urging member to move to change the distance between the support member and the urging member. Driver bits have the tip ends opposed to the support surface, respectively. The driver bits are driven to move toward and away from the urging surface.
1. A screwing apparatus comprising:
a support member having a horizontal support surface;
a single urging member having an urging surface opposed to the support surface, the urging surface being parallel to the support surface;
a driving mechanism configured to drive at least one of the support member and the urging member to move to change a distance between the support member and the urging member; and
driver bits having tip ends opposed to the support surface, respectively, the driver bits each driven to move toward and away from the urging surface,
wherein through holes are formed in the urging member to receive the driver bits, respectively, and
inward flanges are formed on an inner surface of each of the through holes, an inner diameter of the inward flanges being set smaller than an outer diameter of a sleeve receiving a respective one of the driver bits therein.
2. The screwing apparatus according to claim 1 , wherein the urging surface is defined in a surface of a plate member fixed to the urging member, the plate member being made of an electrically-conductive resin.
3. A screwing apparatus comprising:
a support member having a horizontal support surface;
driver bits each having a tip end opposed to the support surface, the driver bits each driven to move toward and away from the support surface;
driving sources assigned to the driver bits, respectively, the driving sources each driving corresponding one of the driver bits to rotate around an axis of the corresponding one of the driver bits;
level detector circuits assigned to the driver bits, respectively, the level detector circuits each detecting a movement distance of corresponding one of the driver bits in an axial direction of the corresponding one of the driver bits; and
a controller circuit configured to identify a detection of the movement distance smaller than a specific value, the controller circuit configured to supply a control signal for reverse rotation to any of the driving sources, the any of the driving sources being assigned to any of the driver bits that is related to the movement distance smaller than the specific value.
4. The screwing apparatus according to claim 3 , wherein the controller circuit is configured to supply a control signal for stoppage of rotation to any of the driving sources that is associated with remaining one or ones of the driver bits other than the any of the driver bits that is related to the movement distance smaller than the specific value.
5. The screwing apparatus according to claim 4 , wherein the controller circuit is configured to supply a control signal for canceling the stoppage of the rotation to the any of the driving sources that is associated with the remaining one or ones of the driver bits related to the control signal for the stoppage of the rotation, when the movement distance of the any of the driver bits that is related to the control signal for the reverse rotation reaches the movement distance of the remaining one or ones of the driver bits related to the control signal for the stoppage of the rotation.
6. A screwing apparatus comprising:
a support member having a horizontal support surface;
driver bits each having a tip end opposed to the support surface, the driver bits each driven to move toward and away from the support surface;
driving sources assigned to the drive bits, respectively, the driving sources each driving corresponding one of the driver bits to rotate around an axis of the corresponding one of the driver bits;
torque sensors assigned to the driver bits, respectively, the torque sensors each detecting torque on corresponding one of the driver bits; and
a controller circuit configured to identify a detection of the torque larger than a specific value, the controller circuit configured to supply a control signal for reverse rotation to any of the driving sources, the any of the driving sources being assigned to any of the driver bits that is related to the torque larger than the specific value, wherein the controller circuit is configured to supply a control signal for stoppage of rotation to any of the driving sources that is associated with remaining one or ones of the driver bits other than the any of the driver bits that is related to the toque larger than the specific value.
7. The screwing apparatus according to claim 6 , wherein the controller circuit is configured to supply a control signal for canceling the stoppage of the rotation to the any of the driving sources that is associated with the remaining one or ones of the driver bits related to the control signal for the stoppage of the rotation, when the movement distance of the any of the driver bits that is related to the control signal for the reverse rotation reaches the movement distance of the remaining one or ones of the driver bits related to the control signal for the stoppage of the rotation.