Sheet stacking equipment

An equipment for stacking sheets comprising a stack support for sheets in vertical stacking, input rollers for introducing and feeding sheets along a given direction, a plurality of elongated transport belts with lower branches arranged above the stack support and a compensation mechanism for modifying a height of the stack support with respect to a reference surface and wherein the transport belts are motorized for shifting entering sheets with the lower branches and depositing the sheets on the stack support or on stacked sheets, wherein said equipment further comprises an arrest member for the entering sheets, a pressing member for a forming stack, a sensor device for a height of a last sheet of the stack and an electronic control unit, wherein the arrest member is designated for arresting and aligning sheets in stacking against a stack alignment surface;

• the pressing member being contiguous to the arrest member and operates on the last sheet of the stack on a pressing area adjacent to a leading edge of the last sheet of the stack with a stabilization function;
• and
• the pressing member comprising a pressing cross member having a lower surface of contrast for the stack, the cross member operates on the pressing area of the last sheet of the stack with its lower surface, and wherein the compensation mechanism is servoized to the sensor device, on control by the electronic control unit, for maintaining constant the height of the last sheet of the stack from the reference surface, wherein the lower surface of the pressing cross member defines longitudinal notches of guide for the transport belts and wherein the lower surface of the cross member further operates on the pressing area of the last sheet of the stack through sections of the belts guided by the longitudinal notches.

An equipment for stacking sheets comprising a stack support for sheets in vertical stacking, input rollers for introducing and feeding sheets along a given direction, a plurality of elongated transport belts with lower branches arranged above the stack support and a compensation mechanism for modifying a height of the stack support with respect to a reference surface and wherein the transport belts are motorized for shifting entering sheets with the lower branches and depositing the sheets on the stack support or on stacked sheets, wherein said equipment further comprises

• an arrest member for the entering sheets, a pressing member for a forming stack, a sensor device for a height of a last sheet of the stack and an electronic control unit, wherein the arrest member is designated for arresting and aligning sheets in stacking against a stack alignment surface;
• the pressing member being contiguous to the arrest member and operates on the last sheet of the stack on a pressing area adjacent to a leading edge of the last sheet of the stack with a stabilization function;
• and
• the pressing member comprising a pressing cross member having a lower surface of contrast for the stack, the cross member operates on the pressing area of the last sheet of the stack with its lower surface, and wherein the compensation mechanism is servoized to the sensor device, on control by the electronic control unit, for maintaining constant the height of the last sheet of the stack from the reference surface, said equipment further comprising an actuator for the operation of the pressing cross member, the cross member is slidably mounted on a support structure and is connected to the support structure by means of springs of compensation for its weight, and wherein the actuator can be adjusted for modifying its action on the pressing cross member.

An equipment for stacking sheets comprising a stack support for sheets in vertical stacking, input rollers for introducing and feeding sheets along a given direction, a plurality of elongated transport belts with lower branches arranged above the stack support and a compensation mechanism for modifying a height of the stack support with respect to a reference surface and wherein the transport belts are motorized for shifting entering sheets with the lower branches and depositing the sheets on the stack support or on stacked sheets, wherein said equipment further comprises

• an arrest member for the entering sheets, a pressing member for a forming stack, a sensor device for a height of a last sheet of the stack and an electronic control unit, wherein the arrest member is designated for arresting and aligning sheets in stacking against a stack alignment surface;
• the pressing member being contiguous to the arrest member and operates on the last sheet of the stack on a pressing area adjacent to a leading edge of the last sheet of the stack with a stabilization function;
• and
• the pressing member comprising a pressing cross member having a lower surface of contrast for the stack, the cross member operates on the pressing area of the last sheet of the stack with its lower surface, and wherein the compensation mechanism is servoized to the sensor device, on control by the electronic control unit, for maintaining constant the height of the last sheet of the stack from the reference surface, said equipment further comprising an offset arrest member as an alternative to the arrest member for arresting the entering sheets against an offset surface of the stack, which is offset with respect to the stack alignment surface, the arrest member and the offset arrest member are formed by a plurality of arrest lugs and by a plurality of transversal offset lugs and wherein the pressing member comprises a pressing crossbar with a lower surface for contrasting the stack and housing windows for the arrest lugs and the offset lugs.

An equipment for stacking sheets comprising a stack support for sheets in vertical stacking, input rollers for introducing and feeding sheets along a given direction, a plurality of elongated transport belts with lower branches arranged above the stack support and a compensation mechanism for modifying a height of the stack support with respect to a reference surface and wherein the transport belts are motorized for shifting entering sheets with the lower branches and depositing the sheets on the stack support or on stacked sheets, wherein said equipment further comprises

• an arrest member for the entering sheets, a pressing member for a forming stack, a sensor device for a height of a last sheet of the stack and an electronic control unit, wherein the arrest member is designated for arresting and aligning sheets in stacking against a stack alignment surface;
• the pressing member being contiguous to the arrest member and operates on the last sheet of the stack on a pressing area adjacent to a leading edge of the last sheet of the stack with a stabilization function;
• and
• the pressing member comprising a pressing cross member having a lower surface of contrast for the stack, the cross member operates on the pressing area of the last sheet of the stack with its lower surface, and wherein the compensation mechanism is servoized to the sensor device, on control by the electronic control unit, for maintaining constant the height of the last sheet of the stack from the reference surface, said equipment further comprising a functional block which includes a mounting support for the arrest member, the pressing member and the sensor device and wherein the mounting support is longitudinally shiftable so as to position the arrest member at a distance from the input rollers depending on the length of the sheets to be stacked, greater than the length.

An equipment for stacking sheets comprising a stack support for sheets in vertical stacking, input rollers for introducing and feeding sheets along a given direction, a plurality of elongated transport belts with lower branches arranged above the stack support and a compensation mechanism for modifying a height of the stack support with respect to a reference surface and wherein the transport belts are motorized for shifting entering sheets with the lower branches and depositing the sheets on the stack support or on stacked sheets, wherein said equipment further comprises

• an arrest member for the entering sheets, a pressing member for a forming stack, a sensor device for a height of a last sheet of the stack and an electronic control unit, wherein the arrest member is designated for arresting and aligning sheets in stacking against a stack alignment surface;
• the pressing member being contiguous to the arrest member and operates on the last sheet of the stack on a pressing area adjacent to a leading edge of the last sheet of the stack with a stabilization function;
• and
• the pressing member comprising a pressing cross member having a lower surface of contrast for the stack, the cross member operates on the pressing area of the last sheet of the stack with its lower surface, and wherein the compensation mechanism is servoized to the sensor device, on control by the electronic control unit, for maintaining constant the height of the last sheet of the stack from the reference surface, wherein the stack support comprises a plurality of elongated delivery belts and support members for the delivery belts, the stack support is operatively connected with the compensation mechanism, while the elongated delivery belts have respective upper branches which are guided by the stack support, wherein the stack support can be vertically moved to a delivery position, the transport belts are longitudinally driven by a delivery motor and wherein the delivery motor is operable for forwarding the stacked sheets to following treatments in the delivery position of the stack support.