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The ready-to-mount axial face seal comprises a rotating unit of a shaft protection sleeve pushable over the pump shaft with a longitudinal section projecting out of the housing of the pump and fastenable to this shaft, with a spring-loaded axial face seal ring surrounding the shaft protection housin

The ready-to-mount axial face seal comprises a rotating unit of a shaft protection sleeve pushable over the pump shaft with a longitudinal section projecting out of the housing of the pump and fastenable to this shaft, with a spring-loaded axial face seal ring surrounding the shaft protection housing and with an elastic sealing ring in the shaft protection sleeve as well as a stationary unit, surrounding the shaft protection sleeve, of a counter ring on which the axial face seal ring bears and of an assembly part for fastening the axial face seal on the pump housing. In relation to the diameter of the pump shaft the wall thickness of the shaft protection sleeve is smaller than with the known shaft protection sleeve. Furthermore the outer diameter of the axial face seal ring and of the counter ring in relation to the same diameter of the pump shaft is an associated standard diameter of an axial face seal without shaft protection sleeve. Such an axial face seal may be applied into a standardised mounting space which is envisaged for a standard axial face seal without shaft protection sleeve.

대표청구항 ▼

The ready-to-mount axial face seal comprises a rotating unit of a shaft protection sleeve pushable over the pump shaft with a longitudinal section projecting out of the housing of the pump and fastenable to this shaft, with a spring-loaded axial face seal ring surrounding the shaft protection housin

The ready-to-mount axial face seal comprises a rotating unit of a shaft protection sleeve pushable over the pump shaft with a longitudinal section projecting out of the housing of the pump and fastenable to this shaft, with a spring-loaded axial face seal ring surrounding the shaft protection housing and with an elastic sealing ring in the shaft protection sleeve as well as a stationary unit, surrounding the shaft protection sleeve, of a counter ring on which the axial face seal ring bears and of an assembly part for fastening the axial face seal on the pump housing. In relation to the diameter of the pump shaft the wall thickness of the shaft protection sleeve is smaller than with the known shaft protection sleeve. Furthermore the outer diameter of the axial face seal ring and of the counter ring in relation to the same diameter of the pump shaft is an associated standard diameter of an axial face seal without shaft protection sleeve. Such an axial face seal may be applied into a standardised mounting space which is envisaged for a standard axial face seal without shaft protection sleeve. nt is a sheet position corresponding to the sensed sheet position plus the first distance.8. The method of claim 4, wherein the feed system also includes a nip roller disposed adjacent the feed roller and includes a sheet sensor disposed upstream from the nip roller, wherein the nip roller is disposed a first distance from a sensed sheet position corresponding to when the sheet sensor first senses the presence of the sheet, wherein the second function includes ramping the desired feed motor velocity from zero to a constant negative deskew velocity and then ramping the desired feed motor velocity from the constant negative deskew velocity to a constant positive feed velocity, wherein the change in desired feed motor velocity direction from negative to positive occurs at a sheet position corresponding to the sensed sheet position plus the first distance, and wherein the predetermined event is the change in feed motor velocity direction from negative to positive.9. The method of claim 8, wherein the first function includes ramping the desired pick motor velocity up from zero to a constant positive pick velocity and then ramping the desired pick motor velocity down to zero, and wherein the ramped-down zero pick motor velocity is reached at a preselected sheet position corresponding to when the pick roller stops pushing the sheet forward.10. The method of claim 8, wherein the first function includes ramping the desired pick motor velocity up from zero to a constant positive pick velocity and, after the sheet sensor first senses the presence of the sheet, includes some positive velocity for a predetermined time or until the sheet reaches a preselected sheet position corresponding to when the pick roller stops pushing the sheet forward after which the first function is zero.11. A method for operating a pick motor of a pick system and a separate feed motor of a feed system to pick and feed a sheet of print media for printing, wherein the pick and feed systems each determine sheet position, and wherein the method comprises the steps of: a) obtaining a desired pick motor velocity for the pick motor from a first function of sheet position; b) obtaining a desired feed motor velocity for the feed motor from a second function of sheet position; c) using the sheet position determined by the pick system for both steps a) and b) until the happening of a predetermined event; d) synchronizing the determined sheet position of the feed system to the determined sheet position of the pick system upon the happening of the predetermined event; and e) using the sheet position determined by the feed system for both steps a) and b) after the happening of the predetermined event, wherein the pick system is in contact with the sheet when the sheet position determined by the pick system is used for both steps a) and b), and wherein the feed system is in contact with the sheet when the sheet position determined by the feed system is used for both steps a) and b). 12. The method of claim 11, wherein the predetermined event occurs substantially when the feed system first grabs the sheet.13. The method of claim 12, wherein the sheet is a paper sheet, and wherein the feed motor indexes the paper sheet during printing.14. A method for operating a pick motor of a pick system and a separate feed motor of a feed system to pick and feed a sheet of print media for printing, wherein the pick and feed systems each determine sheet position, and wherein the method comprises the steps of: a) obtaining a desired pick motor velocity for the pick motor from a first function of sheet position; b) obtaining a desired feed motor velocity for the feed motor from a second function of sheet position; c) using the sheet position determined by the pick system for both steps a) and b) until the happening of a predetermined event; d) synchronizing the determined sheet position of the feed system to the determined sheet position of the pick system upon th