Systems and methods for identifying and transferring sheets
Provided are systems and methods for identifying, isolating, and/or aligning sheets. An identification system can facilitate accurate identification of a sheet by (i) vacating one or more components of the system that are not the sheet from a zone of detection, and/or (ii) determining a reference axis of the sheet. An isolation system can facilitate accurate isolation of a sheet by (i) providing targeted air flow, and/or (ii) introducing a wave into the sheet. Identification systems and/or isolation systems described herein may facilitate isolation of sheets that were previously fastened together by one or more fasteners. An alignment system can facilitate accurate alignment of a first sheet at an upstream location relative to a second sheet at a downstream location via machine learning.
1. A method for isolating sheets, the method comprising:
(a) providing a backstop adjacent to a stack of a first sheet and a second sheet, wherein the second sheet is adjacent to the first sheet in the stack, wherein the second sheet is previously fastened to the first sheet at a previous fastening location;
(b) lifting the first sheet by a device capable of suction, wherein a portion of a surface of the first sheet is coupled to a portion of a surface of the second sheet at the previous fastening location by an adhesive force;
(c) directing the first sheet in a linear motion towards the backstop, wherein the linear motion is interrupted by the backstop; and
(d) isolating the first sheet from the second sheet, wherein the first sheet forms a first wave and the second sheet form a second wave, wherein the first wave and the second wave have different amplitudes.
2. The method of claim 1 , wherein the first wave and the second wave have different frequencies.
3. The method of claim 1 , wherein the linear motion is in a direction opposite a direction of sheet transfer.
4. The method of claim 3 , further comprising, subsequent to isolating, transferring the first sheet, via the device capable of suction, in the direction of sheet transfer.
5. The method of claim 1 , wherein the adhesive force is a static friction force or a lifting force applied by the device capable of suction.
6. The method of claim 1 , further comprising isolating the first sheet from a third sheet previously fastened to the first sheet, wherein the third sheet is adjacent to the second sheet.
7. The method of claim 6 , wherein the third sheet forms a third wave, and wherein the third wave and the first wave have different amplitudes or frequencies.
8. The method of claim 1 , wherein the first sheet and the second sheet are previously fastened at the previous fastening location via a staple.
9. The method of claim 1 , wherein the device capable of suction is a vacuum lifter.
10. The method of claim 1 , further comprising subjecting the stack to vibration or pulsation.
11. A system for isolating sheets, comprising:
a backstop adjacent to a stack of the first sheet and the second sheet, wherein the second sheet is adjacent to the first sheet in the stack, wherein the second sheet is previously fastened to the first sheet at a previous fastening location, wherein a portion of a surface of the first sheet is coupled to a portion of a surface of the second sheet at the previous fastening location by an adhesive force;
a device capable of suction; and
a controller in operative communication with the device capable of suction, configured to:
direct the device capable of suction to lift the first sheet;
direct the first sheet in a linear motion towards the backstop, such that the linear motion is interrupted by the backstop, thereby isolating the first sheet from the second sheet, wherein subsequent to interruption by the backstop, the first sheet forms a first wave and the second sheet form a second wave, wherein the first wave and the second wave have different amplitudes.
12. The system of claim 11 , wherein the first wave and the second wave have different frequencies.
13. The system of claim 11 , wherein the linear motion is in a direction opposite a direction of sheet transfer.
14. The system of claim 13 , wherein the controller is further configured to, subsequent to the isolating, transferring the first sheet, via the device capable of suction, in the direction of sheet transfer.
15. The system of claim 11 , wherein the adhesive force is a static friction force or a lifting force applied by the device capable of suction.
16. The system of claim 11 , wherein the controller is further configured to isolate the first sheet from a third sheet previously fastened to the first sheet, wherein the third sheet is adjacent to the second sheet.
17. The system of claim 16 , wherein subsequent to interruption by the backstop, the third sheet forms a third wave, and wherein the third wave and the first wave have different amplitudes or frequencies.
18. The system of claim 11 , wherein the first sheet and the second sheet are previously fastened at the previous fastening location via a staple.
19. The system of claim 11 , wherein the device capable of suction is a vacuum lifter.
20. The system of claim 11 , wherein the controller is further configured to direct one or more tools to subject the stack to vibration or pulsation.