Abstract: A punch press includes: a press main body; an upper turret member having a workpiece detecting plate; a lower turret member; a striker; striker ascending/descending means; a carriage with a clamper for holding a workpiece in order to position the workpiece between the upper turret member and the lower turret member; and carriage moving means to move the carriage in the horizontal direction. In the above construction, one end of a first conductive wire is electrically connected to the workpiece detecting plate; and one end of a second conductive wire is electrically connected to the press main body. The other end of the first conductive wire and the other end of the second conductive wire are electrically connected to a touch detecting unit to detect a touch between the workpiece detecting plate of the upper turret member and a workpiece clamped by the clamper.

Abstract: A ball screw spline shaft 41 is driven for rotation by a drive motor 53 provided at least on one end thereof. When a feeder ball nut 61 moves in response to the rotation of the ball screw spline shaft 41 from one end of the ball screw spline shaft 41 toward the other end, intermediate supports 65 on both sides thereof travel in the same direction at a lower speed on a support guide 67 and the ball screw spline shaft 41. As a result, the intermediate supports 65 on both sides are located in positions around the middle of the distances between the feeder ball nut and both of the ends and moves while supporting the ball screw spline shaft 41. This increases the critical speed of the ball screw spline shaft 41 to increase the speed of rotation of the ball screw spline shaft 41.

Abstract: In a turret punch press (1) which rotates and indexes an upper turret (5) and a lower turret (7), positions a desired punch and die from a plurality of punches (P) and a plurality of dies (D) to a processing position (25), and performs a punching process in cooperation with the punch and the die, in the case that a core of the die with respect to the punch is offset at a time of replacing the die or after a long time use, since a hole (133) for a bolt (135) fastening a die holder (129) to the lower turret (7) is great, the bolt (135) is loosened so as to adjust a position of the die holder (129) with respect to the lower turret (7).

Abstract: A ram driving device for a press machine having: a ram; a horizontal drive axle (33) rotatably provided horizontally in a frame (3) of the press machine; a motion converting mechanism (35, 63, 83) associated with the horizontal drive axle, for converting a rotational motion of the horizontal drive axle into up-and-down motion of the ram (29); and a plurality of servomotors (43, 47) linked with the horizontal drive axle, for rotating the horizontal drive axle in synchronism with each other, to drive the ram up and down. The motion converting mechanism is a connecting rod (35); and a link mechanism (63) driven by a ball screw (61) and a nut member (77); and an eccentric ring cam (33) and a cam follower (91). Since the ram can be driven by a plurality of the servomotors synchronously, the device can generate a large press power of various moving stroke and various moving speed freely, without increasing the maintenance cost thereof.

Abstract: A punching tool storing and interchanging system of the present invention comprises a plurality of punching tool storing magazines respectively storing the multiplicity of punching tools; a stock area stocking the plurality of punching tool storing magazines at a position apart from the punching tool holding member; an operating area positioning the punching tool storing magazine used for interchanging operation among the plurality of punching tool storing magazines near the punching tool holding member; a magazine transferring apparatus transferring the punching tool storing magazine between the stock area and the operating area; and a punching tool interchanging apparatus. The system selects the punching tool among the multiplicity of punching tools stored in the plurality of punching tool storing magazines and interchanges with the punching tool held by the punching tool holding member in the punch press.

Abstract: Two drive motors (9L, 9R) are provided on both sides of the ball screw (5), and the ball screw is driven by these two drive motors simultaneously. Therefore, the ball nut (17) attached to the worktable and in mesh with the ball screw (5) can be moved reciprocatingly to move and locate the worktable (15) on which workpiece (W) is clamped. Since the ball screw can be rotated by the two drive motors together, even if a ball screw of large lead is used, the maximum rotational speed and the maximum acceleration can be both increased, so that the workpiece can be located in position in a short time. In addition, since the torsional stress and strain generated in the ball screw can be both reduced, the locating precision can be further improved.

Abstract: A ram driving device for a press machine having: a ram; a horizontal drive axle (33) rotatably provided horizontally in a frame (3) of the press machine; a motion converting mechanism (35, 63, 83) associated with the horizontal drive axle, for converting a rotational motion of the horizontal drive axle into up-and-down motion of the ram (29); and a plurality of servomotors (43, 47) linked with the horizontal drive axle, for rotating the horizontal drive axle in synchronism with each other, to drive the ram up and down. The motion converting mechanism is a connecting rod (35); and a link mechanism (63) driven by a ball screw (61) and a nut member (77); and an eccentric ring cam (33) and a cam follower (91). Since the ram can be driven by a plurality of the servomotors synchronously, the device can generate a large press power of various moving stroke and various moving speed freely, without increasing the maintenance cost thereof.

Abstract: In a work feeding device for a plate work processing machine (e.g., a turret punch press), when a ball screw (1) is rotated by a drive motor, a ball nut (103) in mesh with the ball screw and fixed to a worktable is moved in the work feeding direction. Here, the ball screw is divided into a central portion (3) and an outer portion (5). The outer portion (5) thereof is formed of an ordinary material (e.g., steel), and the central portion (3) thereof is formed of a hard material (e.g., cemented carbide) of high longitudinal elastic coefficient. Since the maximum number of revolutions of the ball screw (i.e., the resonance frequency of the ball screw) can be increased, it is possible to move and locate plate work at a high speed, thus realizing a high speed punching processing to improve the working efficiency.

Abstract: The turret punch press has a body frame (3); a ram (51) for striking a punch (41) to punch out work (W) in cooperation with a die (35); an upper turret (39) rotatably mounted on the body frame and having a plurality of punches (41), any desired punch being selectively located at a punch area (A1); and a lower turret (33) also rotatably mounted on the body frame and having a plurality of dies (35), any desired die mated with the desired punch being selectively located at the same punch area (A1). In particular, the upper turret (39) is formed smaller in diameter than the lower turret (33), and further the upper turret (39) is dislocated eccentrically from the lower turret (33) toward the punch area (A1) to provide an open die exchange area (A2) over a part of the lower turret (33). Or else, the upper turret (39) is formed with a cutout portion (53) to provide an open die exchange area (A2) over a part of the lower turret (33) when the upper turret is disposed concentrically on the upper turret (39).

Abstract: The turret punch press has a body frame (3); a ram (51) for striking a punch (41) to punch out work (W) in cooperation with a die (35); an upper turret (39) rotatably mounted on the body frame and having a plurality of punches (41), any desired punch being selectively located at a punch area (A1); and a lower turret (33) also rotatably mounted on the body frame and having a plurality of dies (35), any desired die mated with the desired punch being selectively located at the same punch area (A1). In particular, the upper turret (39) is formed smaller in diameter than the lower turret (33), and further the upper turret (39) is dislocated eccentrically from the lower turret (33) toward the punch area (A1) to provide an open die exchange area (A2) over a part of the lower turret (33). Or else, the upper turret (39) is formed with a cutout portion (53) to provide an open die exchange area (A2) over a part of the lower turret (33) when the upper turret is disposed concentrically on the upper turret (39).

Abstract: In a method of separating a product G connected to a skeleton portion S of work W via a micro joint M, from the skeleton portion, the product is separated from the skeleton portion by striking the skeleton portion in the vicinity of the micro joint to cut off the micro joint from the skeleton. Further, the die pair used for the above-mentioned method comprises a punch 17A provided with a projecting portion 17T at an end thereof and movable up and down; and a die 19A arranged under the punch and formed of an elastic substance. In this method, it is possible to separate products from the skeleton portion of the work efficiently by breaking the micro joints without scratching the products and without generating noise. Further, the separating work of the products from the skeleton portion can be easily automated.

Abstract: The turret punch press has a body frame (3); a ram (51) for striking a punch (41) to punch out work (W) in cooperation with a die (35); an upper turret (39) rotatably mounted on the body frame and having a plurality of punches (41), any desired punch being selectively located at a punch area (A1); and a lower turret (33) also rotatably mounted on the body frame and having a plurality of dies (35), any desired die mated with the desired punch being selectively located at the same punch area (A1). In particular, the upper turret (39) is formed smaller in diameter than the lower turret (33), and further the upper turret (39) is dislocated eccentrically from the lower turret (33) toward the punch area (A1) to provide an open die exchange area (A2) over a part of the lower turret (33). Or else, the upper turret (39) is formed with a cutout portion (53) to provide an open die exchange area (A2) over a part of the lower turret (33) when the upper turret is disposed concentrically on the upper turret (39).

Abstract: In a method of separating a product G connected to a skeleton portion S of work W via a micro joint M, from the skeleton portion, the product is separated from the skeleton portion by striking the skeleton portion in the vicinity of the micro joint to cut off the micro joint from the skeleton. Further, the die pair used for the above-mentioned method comprises a punch 17A provided with a projecting portion 17T at an end thereof and movable up and down; and a die 19A arranged under the punch and formed of an elastic substance. In this method, it is possible to separate products from the skeleton portion of the work efficiently by breaking the micro joints without scratching the products and without generating noise. Further, the separating work of the products from the skeleton portion can be easily automated.

Abstract: A screw shaft feed mechanism includes a screw shaft (25) rotatably supported by a frame (19) and extending in a shaft feed direction of a work table (shaft fed base) (1); a nut member (39) rotatably supported by the work table (1) and engaged with the screw shaft (25); a screw shaft drive motor (29) for rotating the screw shaft (25); and a nut drive motor (57) for rotating the nut member (39), wherein both screw shaft driving means and nut driving means are provided with a motor having a device detecting a rotational angle of a motor shaft, respectively.

Abstract: In a turret punch press 1 provided with an upper rotatable turret 5 having a plurality of punches P and a lower rotatable turret 7 having a plurality of dies D, a diameter of the lower turret 7 is determined to be larger than that of the upper turret 5; rotational centers of the upper and lower turrets 5 and 7 are determined to be eccentric from each other; and on a line obtained by connecting the two rotational centers of both the upper and lower turrets when seen on a plane, a position at which the upper and lower turrets 5 and 7 are overlapped upon each other is determined to be a punching position 21 and positions remotely opposite to the punching position 21 and at which the upper and lower turrets 5 and 7 are separated from each other are determined to be indexing positions 61 at which the angular positions of the punch P and the die D can be both indexed.