Abstract:
The bending press is of the type comprising a movable blank-holder formed by a series of sections in which two spaced-apart sections are in the form of shoes (34) with projections (36) pointing in opposite directions, so that each can be engaged in a channel-shaped bend which has already been made. Each shoe (34) is supported by a shoe-holder body (38) by means of inclined guides (40) by virtue of which, when the movable blank-holder moves away from the fixed blank-holder, the two shoes (134) move towards one another in order to release their projections (36) from the channel-shaped bends. Each shoe (34) and the respective shoe-holder body (138) are interconnected by positive drive means (50, 54, 56, 58) for moving the shoe (34), the means being coordinated with drive means of the movable blank-holder so that the movements of the movable blank-holder away from and towards a fixed blank-holder associated therewith correspond to movements of the shoes (34) towards and away from each other, respectively, without sliding of the shoes on the sheet metal.
Abstract:
The apparatus comprises two blocks (10, 12) intended to be associated respectively with the fixed part and with the movable part of a press, to be moved close and moved away mutually. Each block (10, 12) is equipped with a respective blank holder (14, 22). The block (12) contains a blade-carrier body (38) which is movable with the block itself and has a lateral bending blade (44). The blank holder (14) of the other block has a channel (16) in which the end part of the body (38) can be inserted and one side wall of which is shaped like a counterblade (18). The blank holder of the block (12) is in the form of a plate (22) which is slidable in relation to its block in the direction of mutual moving close of the two blocks (10, 12) and is pushed back by resilient means (56) towards the other block to exert a resilient pressure for restraining the piece of sheet (P). The relative arrangement is such that the bending blade (44) does not project in relation to the plate (22) when it is situated in the position of maximum removal fromits block (12).
Abstract:
The device comprises a transfer unit with a block (44) containing wells (48) in which suckers (50) are located. The wells (48) comprise a border (72) made of a sealing and friction material. The peripheral wall (60) of the sucker (50) is flexible enough to permit axial movement of the lip (62) between an expanded position in which the lip (62) projects above the border (72) of the well (48) and a contracted position in which the lip (62) is coplanar with this border. The internal space of the sucker (50) and the internal space (70) of the well (48) around the sucker are both connected to a vacuum source by respective narrow channels (64, 68) whose cross sections are approximately the same as each other. The size of the cross sections of the narrow channels (64, 68) is such that there is negligible loss of vacuum inside the sucker (50) when a work piece is placed against the lip (62) but not against the border (72) of the well (48).
Abstract:
The cylinder (10) of the actuator comprises, in its head part (12), a fixed annular dividing wall (28) extending towards the piston (14). This dividing wall (28) defines in its interior a head chamber (20) and, around its exterior, a blind annular chamber forming a power chamber (30). The piston (14) comprises a projection (34) that slides inside the power chamber (30). The dividing wall (28) comprises at least one transverse passage (36) for communication between the head chamber (20) and the power chamber (30). This passage (36) is closed by the annular projection (34) in all positions of the piston (14) between the rest end-of-stroke position and a mid-stroke position in order to prevent the hydraulic pressure from being applied from the head chamber (20) to the power chamber (30). The passage (36) is opened by the annular projection (34) in all positions of the piston (14) between the abovementioned mid-stroke position and the working end-of-stroke position. The abovementioned power chamber (30) is preferably a low-power chamber. Between the annular projection (34) and the rod (16), the piston (14) comprises a cylindrical collar (38) whose diameter is greater than the diameter of the annular projection (34). The cylinder (10) comprises a cylindrical cavity in which the collar slides and this cavity forms a high-power chamber (40) which can selectively receive the pressurized hydraulic fluid on the side of the collar (38) nearest the head part (12) of the cylinder (10).
Abstract:
The apparatus comprises two blocks (40, 42) intended to be associated respectively with the fixed part and with the movable part of a press, such as a punching press, to be moved close and moved away mutually. Each block (40, 42) is equipped with a respective blank holder (58; 108). One of the blocks (40) contains a blade-carrier body (66) which bears a bending blade (68). The other block (42) bears a bending counterblade (108) which is capable of interacting with the blade (68). The blade-carrier body (66) is associated, by means of a return member (64), with a driven member (90) turned towards the block (42). This opposite block (42) is provided with a moving member (112) which can be engaged in a thrusting manner with the driven member (90), in the movement of mutual moving close of the two blocks (40, 42), to produce the displacement of the blade-carrier body (66) from a rest position to a work position in which the blade (68) interacts with the counterblade (108). Interposed between the blade-carrier body (66) and the associated block (40) are resilient means (80)for restoring the blade (68) to the rest position.
Abstract:
The device comprises a pair of motorised slides (24) able to move back and forth along a bladeholder in the press. Each slide (24) comprises its own reference block (30) for engaging with the metal sheet that is to be bent. Each reference block (30) moves back and forth in its respective slide (24) towards and away from the bend line. Each slide (24) incorporates a movable toothed bar (46) and gearing (50) to convert the movements of the toothed bar (46) relative to the slide (24) into corresponding movements of the block (30) towards and away from the bend line. Each slide (24) incorporates selectively controllable means (60) for locking and releasing the toothed bar (46) relative to this slide. The device also comprises retaining means carried by the bladeholder for immobilizing the toothed bar in a predetermined position relative to the bladeholder. The arrangement is such that there is a biunivocal correspondence between, on the one hand, the positions of the slide (24) along its guide means when the toothed bar is immobilized in the above-mentioned predetermined position and, on the other hand, the position of the reference block (30) relative to the bend line.
Abstract:
In order to bend an edge of a panel (P), use is made of a blade (66) and a counterblade (70) whose length (L) is less than the length of the bend to be formed. The bend is formed by causing the blade and counterblade and the panel to execute a relative movement in a series of steps along the bend line (A).
Abstract:
The press comprises two tool holders facing each other (28a, 28b), capable of relative movement one towards the other and back again. Each tool holder carries a bending tool (40a, 40b) and a clamping tool (42a, 42b). The tool holders (28a, 28b) are in addition capable of relative movement between two working positions in one of which the rear edge (46a) of a tool holder (28a) is so positioned as to cooperate, in order to bend the sheet (L) in a first direction, with a front edge (44b) of the bending tool (40b) of the other tool holder (28b), and the clamping tool (42b) of the other tool holder (28b) is immediately opposite the tool of the first tool holder (28a) in order to cooperate with it through the interposed sheet (L). In the other working position, the functions of the edges of the bending tools and the functions of the clamping tools are reversed in order to carry out the bend in the other direction. The clamping tools (42a, 42b) are mounted in their tool holders in such a way that they retreat against the force of means of elastic repulsion (50a, 50b).
Abstract:
The mechanical hand (16) comprises, on one hand, a zone (46) for the support and sliding of a panel or slab (SP) in a horizontal working plane (WP) and, on the other hand, a handling gripper (36) which can move horizontally along and across the whole range of said supporting and sliding zone (46). The gripper (36) has a lower jaw (40) located below the working plane (WP). The support and sliding zone (46) is defined by retractable members consisting of an array of vertically moving pillars (48) with each of which are associated positive control means for causing them to perform selectively a travel independently of that of the other pillars between a raised position in which one of its upper support and sliding surfaces is in the working plane (WP), and a lowered position in which the surface is at a level which is lower than that of the lower jaw (40) of the gripper (36). Control means are provided which interconnect the means (Mx, My, Mz) for controlling the movement of the gripper (36) and the means for controlling the movements of each support (48) such that, when the gripper (36) passes through and stops in the zone (46) of the pillars (48), the pillars (48a) which are in correspondence with or in the vicinity of the gripper (36) are lowered such that they do not interfere with its lower jaw (40) whilst the other pillars (48) are raised in order to hold the panel (SP).