1. A buffer store for a flat web material, said buffer store comprising
at least two roller registers, said roller registers having a plurality of freely rotatable rollers and being movable relative to one another at least in an axis direction radial to an axis of the rollers thereby forming variable partial lengths or loops of the flat web material between the rollers of the roller registers,
at least one piston-cylinder arrangement having a cylinder chamber for containing a compressible pressure medium, said piston-cylinder arrangement acting as a spring between the at least two roller registers in order to generate a web tension in the flat material guided through the buffer store, and
a control device for applying a constant or substantially constant operating pressure of the pressure medium to the at least one piston-cylinder arrangement, the control device having
a first control valve arrangement that switches between a first condition, for normal operation, and a second condition, for operation during a machine standstill andor a fault, wherein,
in the first condition, the control valve arrangement connects the cylinder chamber of the at least one piston-cylinder arrangement to a device for providing the constant or substantially constant operating pressure, and
in the second condition, the control valve arrangement closes the cylinder chamber of the at least one piston-cylinder arrangement and connects said cylinder chamber to a relief valve that relieves pressure in the cylinder chamber to a residual pressure that is significantly smaller than the operating pressure.
2. The buffer store according to claim 1, wherein the relief valve comprises a valve or safety valve that opens at a pressure above the residual pressure and blocks at a pressure that is equal to or smaller than the residual pressure.
3. The buffer store according to claim 1, wherein the residual pressure is set to approximately 30% to 40% of the operating pressure.
4. The buffer store according to claim 1, wherein the residual pressure is adjusted on the basis of the mass of the pivot frame.
5. The buffer store according to claim 1, wherein the residual pressure is adjusted to approximately 1 bar.
6. The buffer store according to claim 2, wherein the residual pressure is adjusted on the basis of the mass of the pivot frame.
7. The buffer store according to claim 1, further comprising a throttle with a non-return valve arranged parallel to said throttle, said throttle being provided in the connection between the control valve arrangement and the piston-cylinder arrangement, said non-return valve opening for flow out of the cylinder chamber of the at least one piston-cylinder arrangement and blocking flow in the opposing direction.
8. The buffer store according to claim 1, wherein the control valve arrangement is controllable by the pressure of the pressure medium such that, in the absence of pressure from the pressure medium, said control valve arrangement assumes the second condition thereof.
9. The buffer store according to claim 1 wherein the device for providing the operating pressure comprises a pressure controller.
10. The buffer store according to claim 1, further comprising at least one second control valve arrangement that is controllable between at least a first condition and a second condition, wherein
said first condition connects the cylinder chamber of the at least one piston-cylinder arrangement to the device for providing the pressure medium at operating pressure, and
said second condition vents the cylinder chamber into the atmosphere.
11. The buffer store according to claim 10, wherein the first andor second control valve arrangements are formed from at least one control valve.
12. The buffer store according to claim 1, according to one of the preceding claims, wherein one roller register is fixed and one roller register is movable.
13. The buffer store according to claim 1,
wherein at least one roller register is a movable roller register provided on a pivot frame, and
wherein the at least one piston-cylinder arrangement acts between the pivot frame or an arm of the pivot frame and a machine frame element of the buffer store.
14. The buffer store of claim 1, wherein the piston-cylinder arrangement is configured to act as a gas spring.
15. The buffer store of claim 1, wherein the piston-cylinder arrangement is configured to act as a compression spring.
16. The buffer store of claim 7, wherein the throttle comprises an adjustable throttle.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A semiconductor storage device comprising a memory array, said memory array comprising:
a user region where user data is stored; and
a redundancy region where redundancy data is stored,
wherein said user region and said redundancy region are each formed of at least one entire given page unit and each page unit in said memory array can be used either as said user region or as said redundancy region.
2. The semiconductor storage device according to claim 1, further comprising:
an IO portion that receives, from outside, a read command that contains information about a user address indicating an address in said user region where a specified piece of said user data is stored, and information about a redundancy address indicating an address in said redundancy region where a piece of said redundancy data that corresponds to said specified piece of user data is stored; and
a controller that reads said specified piece of user data from said user region on the basis of said information about said user address, and that reads said piece of redundancy data that corresponds to said specified piece of user data from said redundancy region on the basis of said information about said redundancy address.
3. The semiconductor storage device according to claim 2,
wherein said information about said redundancy address is an address value or an index value used in relative addressing, said semiconductor storage device further comprises a redundancy address offset register that is capable of setting an offset value, and
said controller reads said specified piece of redundancy data from said redundancy region on the basis of said address value or said index value and said offset value set in said redundancy address offset register.
4. The semiconductor storage device according to claim 3, wherein said redundancy address offset register is capable of setting said offset value through an operation of external equipment.
5. The semiconductor storage device according to claim 2, wherein
said information about said redundancy address indicates a variation from a previous address, and
said controller specifies a current address on the basis of the variation from said previous address and reads said piece of redundancy data that corresponds to said specified piece of user data from said redundancy region on the basis of the specified current address.
6. The semiconductor storage device according to claim 2, wherein
said information about said redundancy address indicates a given expression for calculation, and
said controller specifies the address on the basis of said given expression for calculation and reads said piece of redundancy data that corresponds to said specified piece of user data from said redundancy region on the basis of the specified address.
7. The semiconductor storage device according to claim 1, further comprising a redundancy data storing register capable of temporarily storing said redundancy data read from said redundancy region.