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US 7,028,611 B2Granted
Motor driven link press
AssigneeMurata Kikai Kabushiki Kaisha
InventorMasayuki Nagae
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AssigneeMurata Kikai Kabushiki Kaisha
InventorMasayuki Nagae
Estimating the term…
The present invention provides a motor driven link press which enables working with a heavy press load and also enables a working cycle time to be improved even when a motor with a relatively low output power is used and which can be properly controlled easily. A motor driven link press comprises a link mechanism 1 that converts a rotating operation into a linear operation and a ram 6 that elevates and lowers for press working on the basis of this linear operation. The link mechanism 1 comprises a crank member 2 having a crank shaft 3 and an eccentric shaft portion 4, a pivoting link 5, a connecting rod 7, and a restraining link 8. The pivoting link 5 has a first to third connecting portions P1 to P3 and is connected to the eccentric shaft portion 4 of the crank member 2 using the connecting portion P1. The connecting rod 7 is connected to the second connecting portion P2 and the ram 6. The restraining link 8 is rotationally removably supported on a frame 9 and is connected to the connecting portion P3 to restrain pivoting of the pivoting link 5. A drive transmitting system 14 is provided to transmit driving effected by a motor 13 to the crank shaft 3 of the link mechanism 1. The drive transmitting system can control rotation of the motor 13 to transmit driving effected by the motor 13 so that an elevating and lowering operations of the ram 6 can be controlled.
A link type punch press characterized by comprising a motor, a link mechanism that converts rotating operation transmitted by the motor via a drive transmitting system, into a linear operation, and a ram installed below said link mechanism to elevate and lower for press working on the basis of said linear operation, said link mechanism comprising a crank member having a crank shaft and an eccentric shaft portion, a pivoting link having a first to third connecting portions located at vertices of a triangle and which are used for rotatable connections, the first connecting portion being connected to the eccentric shaft portion of said crank member, a connecting rod having opposite ends connected to the second connecting portion and an upper end of said ram, respectively, and a restraining link having a proximal end rotationally movably connected to a frame and a leading end connected to the third connecting portion of said pivoting link, to regulate pivoting of said pivoting link, and
Dependencies are inferred from the claim text.