Transfer device comprising a gripper
A gripper ( 42 ) for gripping an object ( 14 ), intended for a transfer device includes two jaws ( 64, 66 ). Each of the jaws includes: a recess ( 92 ), and a first clamping portion ( 94 ) and a second locking portion ( 96 ). The first clamping portion ( 94 ) of each jaw ( 64, 66 ) of the gripper ( 42 ) includes a supporting surface and, when the gripper ( 42 ) is closed around an object ( 14 ) occupying a predetermined reference position, the supporting surface is intended to engage with a portion of a bearing surface of a radial collar of the object.
1. A device ( 10 ) for transferring objects, said transfer device ( 10 ) comprising:
a gripper ( 42 ) that that transfers objects, including preforms ( 14 ) or containers ( 16 ), said objects comprising i) a neck ( 44 ) having a distal first end provided with a rim ( 46 ) delimiting an opening ( 48 ), and a second end provided with a radially projecting annular collar ( 50 ) having a bearing face ( 62 ), ii) a junction section ( 60 ) adjacent the collar ( 50 ), and iii) a hollow body ( 56 ) extending axially away from the opening ( 48 ) of the neck ( 44 ) from the junction section ( 60 ) to a bottom ( 58 ), wherein,
said gripper ( 42 ) includes at least a first jaw ( 64 ), a second jaw ( 66 ), and a housing ( 68 ) delimited between the first and second jaws ( 64 , 66 ), wherein when transferring one said object, said housing ( 68 ) receives a portion of said object ( 14 , 16 ),
the gripper ( 42 ) moves between i) an open position in which said object ( 14 , 16 ) can be extracted from between or inserted between the first and second jaws ( 64 , 66 ) to occupy a particular reference position in the housing ( 68 ) and ii) a closed position in which, when said object ( 14 , 16 ) is present, said jaws ( 64 , 66 ) cooperate with at least a portion of said object ( 14 , 16 ) to retain said object ( 14 , 16 ) in said particular reference position,
the first and second jaws ( 64 , 66 ) each include, respectively:
i) a first, clamping portion ( 94 ) that, in the closed position of the gripper ( 42 ), applies a radial clamping force to the junction section ( 60 ) of said object ( 14 , 16 ), the radial clamping force retaining said object ( 14 , 16 ) in said particular reference position in the housing ( 68 ), and
ii) a second, locking portion ( 96 ) that, in the closed position of the gripper ( 42 ), is in axial abutment with a top surface of the rim ( 46 ) of the neck ( 44 ) of said object thereby axially locking said object in said particular reference position, and
iii) a recess ( 92 ) that axially separates the first and second jaws ( 64 , 66 ), the recess ( 92 ) being open radially, and
the first, clamping portion ( 94 ) of each jaw ( 64 , 66 ) includes a support face ( 98 ) that, in the closed position of the gripper ( 42 ) with said object ( 14 , 16 ) occupying said particular reference position, cooperates with an adjacent portion of the bearing face ( 62 ) of the annular collar ( 50 ).
2. The device as claimed in claim 1 , wherein,
an amorphous area of the junction section ( 60 ) that is directly adjacent the collar ( 50 ) has a first height (E), and
the first, clamping portion ( 94 ) of each jaw ( 64 , 66 ) has an thickness (e),
the first height (E) being greater than or substantially equal to the thickness (e) of the first, clamping portion ( 94 ) of each jaw ( 64 , 66 ) such that, in the closed position of the gripper ( 42 ), the radial clamping force exerted by said first portion ( 94 ) of each jaw ( 64 , 66 ) is applied to only to the amorphous area of the junction section ( 60 ).
3. The device as claimed in claim 1 , wherein the second, locking portion ( 96 ) of each jaw ( 64 , 66 ) includes at least one abutment face ( 102 ) that, in the closed position of the gripper ( 42 ), is in the axial abutment with a part of the top surface of the rim ( 46 ) of the neck ( 44 ) of said object thereby axially locking said object in said particular reference position.
4. The device as claimed in claim 3 , wherein the abutment face ( 102 ) of the second, locking portion ( 96 ) of each jaw ( 64 , 66 ) has an axial clearance “j” relative to the rim ( 46 ) of the neck ( 44 ) of the object ( 14 , 16 ) occupying said particular reference position.
5. The device as claimed in claim 1 , wherein the second, locking portion ( 96 ) is produced in one piece with the first, clamping portion ( 94 ) so that each jaw ( 64 , 66 ) of the gripper ( 42 ) constitutes a one-piece subassembly.
6. The device as claimed in claim 1 , wherein the second, locking portion ( 96 ) of each jaw ( 64 , 66 ) of the gripper ( 42 ) consists of a locking arm ( 100 ).
7. The device as claimed in claim 6 , wherein the second, locking portion ( 96 ) of each jaw ( 64 , 66 ) each includes a frustoconical surface ( 104 ) which, on closing the gripper ( 42 ), cooperates with the neck ( 44 ) of said object to position the object ( 14 , 16 ) in said particular reference position.
8. The device as claimed in claim 1 , characterized in that the jaws of the gripper ( 42 ) are made of polyetheretherketone.
9. The device as claimed in claim 1 , wherein the second, locking portion ( 96 ) of each jaw ( 64 , 66 ) further includes
i) an abutment face ( 102 ) that, in the closed position of the gripper ( 42 ), is in the axial abutment with a corresponding part of the top surface of the rim ( 46 ) of the neck ( 44 ) of said object thereby axially locking said object in said particular reference position, and
ii) adjacent and radially interior to the abutment face ( 102 ), a frustoconical surface ( 104 ) which, on closing the gripper ( 42 ), cooperates with the neck ( 44 ) of said object to position the object ( 14 , 16 ) in said particular reference position.