System for the production of pressed board

Claim 2

In an apparatus for the production of pressed board comprising a press having upper and lower press belts and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and further comprising means for mechanically synchronously coupling said drives for accelerating said belts to a normal operating speed for compression of said layer between said press belts, and for decoupling said drives upon attainment of said speed, said first drive including a motor, a device responsive to the torque at said press-traversing belt for producing a control signal upon decoupling of said drives by the last-mentioned means, and means responsive to said signal for controlling said motor to maintain synchronism of said press-traversing and press belts.

Claim 3

In an apparatus for the production of pressed board comprising a press having upper and lower press belts and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and further comprising means for mechanically synchronously coupling said drives for accelerating said belts to a normal operating speed for compression of said layer between said press belts, and for decoupling said drives upon attainment of said speed, said first drive including a motor, a device responsive to the torque at said press-traversing belt for producing a control signal upon decoupling of said drives by the last-mentioned means, and means responsive to said signal for controlling said motor to maintain synchronism of said presstraversing and press belts.

Claim 4

In an apparatus for the production of pressed board comprising a press having upper and lower press belts and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and further comprising means for mechanically synchronously coupling said drives for accelerating said belts to a normal operating speed for compression of said layer between said press belts, and for decoupling said drives upon attainment of said speed, said first drive including a motor, a device responsive to the torque at said press-traversing belt for producing a control signal upon decoupling of said drives by the last-mentioned means, and means responsive to said signal for controlling said motor to maintain synchronism of said presstraversing and press belts.

Claim 5

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said second drive includes a constant speed-controlled master motor, and said first drive comprises another motor, said improvement further comprising means for controlling said other motor in accordance with the speed of said master motor to maintain synchronism of said press-traversing and press belts.

Claim 6

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said second drive includes a constant speed-controlled master motor, and said first drive comprises another motor, said improvement further comprising means for controlling said other motor in accordance with the speed of said master motor to maintain synchronism of said press-traversing and press belts.

Claim 7

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said second drive includes a master Motor operatively connectable to said press-traversing belt and respective slave motors coupled to said master motor and operatively connected to others of said conveyors.

Claim 8

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said second drive includes a master Motor operatively connectable to said press-traversing belt and respective slave motors coupled to said master motor and operatively connected to others of said conveyors.

Claim 9

The improvement defined in claim 3, further comprising an auxiliary device shiftable along the path of the layer, and a slave motor coupled to said master motor for displacing said auxiliary device.

Claim 10

The improvement defined in claim 3, further comprising a roll engaging said press-traversing belt, a shaft connected to said roll, a transmission connecting said shaft to said master motor, and means responsive to the torque at said shaft for controlling said first drive.

Claim 11

The improvement defined in claim 3 wherein one of said conveyors includes a transfer edge provided with a carriage reciprocable in the direction of advance of the layer for transferring said layer from said one of said conveyors to a successive conveyor, said improvement further comprising a phase-angle responsive slave motor coupled to said master motor and operatively connected to said carriage for displacing same.

Claim 12

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and further comprising a support belt within said press-traversing belt and spanning the length of said press, and means for selectively connecting said support belt to said first drive during acceleration of said belts to advance said layer into said press and for disconnecting said support belt from said first driven upon entry of said layer into said press.

Claim 13

In an apparatus for the production of pressed board comprising a press having upper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and further comprising a support belt within said press-traversing belt and spanning the length of said press, and means for selectively connecting said support belt to said first drive during acceleration of said belts to advance said layer into said press and for disconnecting said support belt from said first driven upon entry of said layer into said press.

Claim 14

In an apparatus for the production of pressed board comprising a press having uper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said first drive includes a motor, a torque-responsive element responsive to the torque at said press belts for generating a controlled torque signal, another element for generating a torque set-point signal, and a comparator connected to said elements for producing a torque error signal for controlling said motor in response to said torque error signal; and said second drive includes another motor, a speed-responsive element responsive to the speed of said press-traversing belt for generating a controlled speed signal, another element for generating a speed set-point signal, and a comparator connected to the latter two elements for producing a speed error signal for controlling said other motor.

Claim 15

In an apparatus for the production of pressed board comprising a press having uper and lower press bolts, and transport conveyors for advancing a layer of compressible material into, through and beyond said press, said conveyors including a press-traversing belt, said press-traversing belt at least intermittently being synchronized with said press belts, the improvement which comprises a first drive operatively connected to said press belts for driving same, a second drive operatively connected to said conveyors and independent of said first drive, and wherein said first drive includes a motor, a torque-responsive element responsive to the torque at said press belts for generating a controlled torque signal, another element for generating a torque set-point signal, and a comparator connected to said elements for producing a torque error signal for controlling said motor in response to said torque error signal; and said second drive includes another motor, a speed-responsive element responsive to the speed of said press-traversing belt for generating a controlled speed signal, another element for generating a speed set-point signal, and a comparator connected to the latter two elements for producing a speed error signal for controlling said other motor.

Claim 16

The improvement defined in claim 8 wherein said elements, comparator and motor of said first drive are connected to maintain a constant torque at said press belts.

Claim 17

The improvement defined in claim 8 wherein said elements, comparator and motor of said second drive are connected to maintain a constant speed of said second drive.

Claim 18

The improvement defined in claim 8 wherein the comparator of said second drive is connected to said other element of said first drive for varying the torque set-point signal.