1. Sheet feeding apparatus for feeding sheets along a path from the bottom of a stack of sheets comprising in combination, a conveyor means for moving sheets from the bottom of a stack of sheets, a support means under the stack and above said path for engaging the lowermost sheet, said conveyor means being engageable with the lowermost sheet to move it off said support means and along said path, and air flow means for directing a flow of air between the lowermost sheet and the stack to separate the lowermost sheet from the stack, said support means being located to engage a rear end portion of said stack, and said air flow means being located to direct a flow of air at the rear end of the stack of sheets in a space located between the lowermost sheet and its overlying sheet once said conveyor moves the lowermost sheet off said support means.
2. Apparatus defined in claim 1 wherein said sheets are plastic sheets.
3. Apparatus defined in claim 1 further including a box making machine located downstream of the path for receiving the sheets from said conveyor means.
4. Apparatus defined in claim 2 further including a box making machine located downstream of the path for receiving the sheets from said conveyor means.
5. Apparatus defined in claim 2 wherein air flow is under a pressure of 15 to 80 psi.
6. Apparatus defined in claim 1 wherein said support is a cross bar under said rear end portion of the stack and extending transversely of and above said path.
7. Apparatus defined in claim 6 including means mounting said cross bar for movement towards or away from said rear end portion of the stack for adjustment.
8. A method of feeding sheets forwardly along a path from the bottom of a stack of sheets including the steps of placing the stack on a support positioned above said path and engaging the lowermost sheet at a rear portion of the stack, moving the lowermost sheet along the path and off the support so that the rear portion of the lowermost sheet drops to provide a space between the lowermost sheet and the stack, and directing a flow of air into said space at the rear portion of the stack between the lowermost sheet and the stack to separate the lowermost sheet from the stack as the lowermost sheet is moved along said path.
9. The method defined in claim 8 applied to feeding sheets to a box making machine.
10. The method defined in claim 8 wherein the sheets are plastic sheets.
11. The method defined in claim 10 applied to feeding plastic sheets to a box making machine.
12. The method defined in claim 8 wherein said support is an elongated member.
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 system for treating tissue with light, comprising: a laser device with a pulsed light output and a controller for the laser device, wherein the controller implements a user interface which permits a user to specify input parameters for defining microablation treatment parameters and wherein the controller controls the laser light output to achieve the desired microablation treatment parameters specified by the user; the laser device being selectable through the controller to control the laser device output to produce an ablative pulsed laser output and a non-ablative heating output, the non-ablative heating output heating targeted subsurface tissue to create a thermal affected zone and cause non-ablative collagen remodeling;
wherein the controller is further configured to control the laser light output such that the laser light output comprises a plurality of consecutive pulses, at least one of the plurality of consecutive pulses being an ablative pulsed laser output followed by non-ablative heating, the at least one ablative pulsed output and the non-ablative heating output being overlapping in area of effect on the tissue; and, wherein the at least one ablative laser pulse causes at least one microchannel to be formed in the tissue, the at least one microchannel providing a conduit to apply non-ablative heating to the targeted subsurface tissue;
wherein the light with which the tissue is treated has a wavelength of at least about 9 um;
wherein the at least one microchannel has a width from about 50 to less than about 200 um; and
wherein a plurality of microchannels are formed in the tissue based on a density of microchannels determined by one or more of the microablation treatment parameters or an operator of the system.
2. The apparatus of claim 1, wherein the at least one microchannel has a predetermined width and predetermined height, and the thermal affected zone has a predetermined volume and shape proximate said microchannel.
3. The method of claim 2, wherein the thermal affected zone has a cross section in a plane parallel to that surface which increases in diameter with the plane’s distance from that surface, so that the diameter of the cross section increases with distance from that surface for a range of distances to the surface.
4. The apparatus of claim 1, wherein the depth of the at least one microchannel is much greater than its diameter.
5. The apparatus of claim 1 wherein the depth and the width of the at least one microchannel are controlled by one or more of the laser wavelength, pulse duration, pulse width, pulse frequency and power.