US3918706A - Pneumatic sheet transport and alignment mechanism - Google Patents

Pneumatic sheet transport and alignment mechanism Download PDF

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US3918706A
US3918706A US48231074A US3918706A US 3918706 A US3918706 A US 3918706A US 48231074 A US48231074 A US 48231074A US 3918706 A US3918706 A US 3918706A
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sheet
nozzles
transport
edge
vector
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James Alexander Craft
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International Business Machines Corp
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International Business Machines Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
    • B65H5/228Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by air-blast devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00Registering, e.g. orientating, articles; Devices therefor

Abstract

A pneumatic sheet transport and alignment mechanism is disclosed utilizing the orientation of the air jets in the pneumatic transport to cause the sheet being transported to be moved laterally to engage an edge guide such that the sheet is properly aligned for subsequent operations upon exiting from the transport and alignment mechanism. Additionally a technique is disclosed which allows the sheet to be progressively engaged with the edge guide or reference edge such that the trailing corner of the sheet as it progresses through the transport is engaged with the reference edge prior to the leading corner thereby avoiding jams and retarded sheets.

Description

United States Patent [191 Craft [4 1 Nov. 11, 1975 PNEUMATIC SHEET TRANSPORT AND ALIGNMENT MECHANISM [75] Inventor: James Alexander Craft, Lexington,

[52] US. Cl. 271/250; 271/195; 302/31 [51] Int. Cl. B6511 9/04; B6511 5/22 [58] Field of Search 271/248, 250, 251, 195.

[56] References Cited UNlTED STATES PATENTS 2,240.424 4/1941 Spiess 271/251 3.103.850 9/1963 Khorry et a1... 271/195 X 3.588.096 6/1971 Leiter 271/195 X 3.624.807 11/1971 Schwebel 271/195 X 3.747.922 7/1973 Groeber 271/195 Primar E.\'aminerEvon C. Blunk Assistant E.\'aminerBruce H. Stoner. Jr. Attorney, Agent, or FirnzLaurence R. Letson [57 ABSTRACT A pneumatic sheet transport and alignment mechanism is disclosed utilizing the orientation of the air jets in the pneumatic transport to cause the sheet being transported to be moved laterally to engage an edge guide such that the sheet is properly aligned for subsequent operations upon exiting from the transport and alignment mechanism. Additionally a technique is disclosed which allows the sheet to be progressively engaged with the edge guide or reference edge such that the trailing corner of the sheet as it progresses through the transport is engaged with the reference edge prior to the leading corner thereby avoiding jams and retarded sheets.

US. Patent 1 Nov. 11, 1975 IIIIIIIIIIIIII/(I'IIIIIIIII FIG. 1

FIG. 3

l I I I IJ PNEUMATIC SHEET TRANSPORT AND ALIGNMENT MECHANISM BACKGROUND OF THE INVENTION It is desirable in many circumstances to align a sheet such as a sheet of paper after it has departed from one process and before being reprocessed or further handled. An example of this is in the printing and photocopying environments. An example of a need to align a sheet in a different but generally parallel feed path, is where the copy or sheet exiting from a photocopying machine or printing press is exited in a path which is not properly aligned with a sheet receiving and processing mechanism such as a sheet sorter or collator. This situation occurs where it is desired that the sheets be presented to the operator of the device at the front of the sheet collating or sorting machine while at the same time accommodating that requirement with the fact that the sheets may exit from the device which produces the copies at a location closer to the back of the machine.

In such situations, it is necessary to attempt to align the sheet toward the front of the apparatus prior to further processing and thereby cause the sheets to be col- Iated or sorted and deposited in bins for the operator to remove from the front of the machine.

It is further desirable to provide a device which is either continuously on or off as desired by the machine operator which is exceedingly simple in operation both from a maintenance and operational reliability standpoint.

Pressurized pneumatic conveyors have shown a propensity for reliability and simplicity when handling sheets and strips of materials.

Pneumatic guides and transports for strips, have been previously disclosed in U.S. Pat. No. 3,103,850 and U.S. Pat. No. 3,705,413. In both of these prior art applications, air jets having a direction of air flow in a plane parallel to the direction of movement desired of the strip being transported are disclosed, however, there is no alignment function with the exception of a complete restraining movement against lateral movement provided by the rigid mechanical members of the apparatus. The use of angularly oriented jets or nozzles to provide a lubricated air bearing transport and moving force is well illustrated in these devices. In both of these devices, the material being transported is of a strip nature rather than a sheet nature and therefore is sufficiently long that it provides its own guiding forces in cooperation with the rigid side members of the transport mechanism.

Other devices have been disclosed which utilize an air cushion on one side of the card or sheet being transported in cooperation with angularly oriented propulsion jets to provide the forward vector of force, which are oriented generally such that the projection of their axis onto the plane of transport is parallel to the direction desired in transporting the sheet. An example of this device is U.S. Pat. No. 3,405,977. This device also provides a rigid physical retaining member along the sides of the transport path such that the sheet is physically restrained laterally during transport.

An additional device disclosing the use of propulsion jets to move sheets is U.S. Pat. No. 3,198,515 which discloses the use of propulsion jets on one side of a sheet in one direction and the propulsion jets in an opposite direction on the opposite side such as to separate two sheets in the event that two sheets are attempted tobe fed at the same time.

- In this device, the only alignment forces are exerted by the rigid base member disclosed in the drawings together with the action of gravity on the sheet being fed. INVENTION U.S. Pat. No. 3,614,168 discloses a conveyor system using the Bernoulli phenomena together with atmospheric pressure acting on the backside ofthe sheet being transported. Selection of the path may be made from several possible paths by the activation of a control unit which controls the pressurization of one of several plenums thus providing the Bernoulli low pressure attracting region for that path and providing no forces for the other path. The system provides physical side restraints with no alignment function being disclosed.

OBJECTS OF THE INVENTION It is therefore an object of the invention to align a sheet for further operations during the transporting of the sheet, using a pneumatic transporting and alignment techniques.

It is another object of the invention to prevent jamming of the sheet within the transport mechanism during transportation and alignment.

It is still another object of the invention to improve and simplify sheet transportation and alignment apparatuses.

The foregoing objects are accomplished by the formation of a transport path or transport region between two restraining means and the angularly forwardly impinging of air from nozzles or jets onto the sheet being transported to provide the sheet with both a transporting forward force or vector and a lateral force or vector to accomplish alignment and positioning. Additionally the jets are broken into groups to provide a simultaneous twisting or turning moment on the sheet to prevent the leading corner from engaging the edge guide or reference guide early thus preventing the jamming of a sheet into the edge guide which would prevent continued operation of the apparatus.

The foregoing and'other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings.

In the Drawings FIG. 1 is a plan view of the bottom restraining means and air jets oriented to accomplish the objects of the invention.

FIG. 2 is a sectional view of the top and bottom restraining means together with the nozzles and jets.

FIG. 3 illustrates an alternative embodiment of the arrangement in FIG. 2.

DETAILED DESCRIPTION Referring to FIG. '1, a top and bottom restraining means 12, 10 is provided to support the sheet and to guide the sheet with respect to one plane during its transport through the transport and alignment apparatusi These restraining means 10 may be ofmany different.configurations but may most conveniently be formed ofa relatively thin sheet of material such as aluminum or other metal sheeting to provide a generally flat surface. It should be recognized that should there be a need for making the surface other than flat, it may have small surface irregularities such as shallow bend but that the apparatus functions best with a flat surface.

A complimentary top restraining means 12, illustrated in FIGS. 1, 2 and 3, is placed over and maintained spaced apart from the bottom restraining means thereby providing a relatively thin channel or spacing between the two restraining means 10, 12 for the sheet to be restrained within and acted upon by the air flow from the transport and aligning nozzles. For reference purposes and for alignment a reference edge or edge guide 14 is provided along one edge of bottom restraining means 10, and extending across the gap between restraining plates 10, 12.

Where bottom restraining means 10 or bottom plate 10 is in fact a solid metal plate the pneumatic nozzles or air jets 18, 22, 34 used for transporting and aligning may be either formed by drilling through the plate at the desired angle or may be formed by creating an opening 42 in the plate l0, l2 and then projecting a nozzle or tube through that opening at the appropriate desired angle. In either event, the techniques are equivalent and provide substantially identical results.

Depending upon the size of the sheets to be accommodated by the transport mechanism, a plurality ofjets are positioned and aimed through bottom restraining means 10 and top restraining means 12. It is desirable to have a plurality ofjets acting upon a sheet at any one time with the minimum number being two and the maximum number being determined by nozzle size and spacing.

Recognizing that the precise number ofjets acting on a sheet at any one time is not a critical element of this invention, the device is illustrated in FIG. 1 with a total of nine jets in the bottom restraining means 10 and a like number would be found in the top restraining means 12 illustrated in sectional view in FIG. 2. The transport and aligning mechanism is positioned such that a sheet may be received from a device, such as, for example a printer of any of several diverse types, i.e., offset printer, photographic printer or electrophotographic printer or electrostatic copying apparatus, or

other sheet outputting device.

Generally the sheet is outputted from whatever base machine is involved by means of conventional sheet handling techniques such as belts, pinch rolls, or other well known sheet transport mechanisms. With a knowledge of the size sheets that the apparatus outputting the sheet material will accommodate, the transport and aligner may be adapted to accommodate sheets of that size, or may be made to accommodate sheets of a plurality of sizes.

A better understanding of the operation and construction of the invention may be secured from the following of the examples as shown in FIGS. 1 and 2 with the modification in FIG. 3.

Referring to FIG. 1, jets 16, 18, and 22 are all ori ented at an angle sufficient to impart a substantial translating or lateral force vector to the sheet 8. As can be seen, the sheet 8 is still engaged by pinch rolls 40 of the base machine or printer and thus the effect of jets 16 and 18 have not overcome the feed effects of pinch rolls 40. As the sheet progresses or pinch rolls 40 become disengaged the forces exerted by jets 16 and 18 begin to translate sheet 8 in the direction of arrows 24. As sheet 8 progresses in the direction of arrows 24, the sheet is engaged by the air flow from jets 20 and 22 which provide additional force in the direction of arrows 24. At about the same time as the sheet is being engaged by jets 20 and 22, the lower edge in FIG. lIof sheet 8 is being acted upon by the flow from jet 26. As jet 26 acts on the sheet a larger component of force is exerted in the forward or transport direction, i.e., from right to left in FIG. I, and a diminished translating vector, i.e., from top to bottom, is placed on the lower end of sheet 8. In view of the increase forward force of jet 26 there is created a turning moment about an axis which is perpendicular to sheet 8 causing the sheet to have a tendency to turn in a clockwise direction. As the sheet progresses along the general direction of arrows 24, the sheet will engage the air flow from jet 28 which further reinforces the action of jet 26.

While jets 16, 18, 20 and 22 are generally oriented the same providing a large translational vector and a. substantial transporting vector, these jets may be considered as one group providing primarily an aligning. and transporting force. Jets 26 and 28 having a reduced angular orientation with respect to the reference edge 14 provide primarily a turning and transporting force. The turning force tends to engage the trailing corner of sheet 8, designated as 9, with reference edge 14 prior to the leading corner designated 7 thereby preventing corner 7 from abutting into reference edge 14 and crumpling or otherwise causing a jam in the transport 2 14 is sufficient to overcome the translationaleffects of those jets still acting on it, the forward vector will trans late the sheet until jets 30, 32 and 34 engage it.'As can be seen from FIG. 1, the angular orientation 'of jets 30, 32 and 34 is still such that they form a small acute angle with respect to the reference edge but such that the translational force vectors created thereby are small with respect to the forward transporting vector. Thus;

a force is exerted on sheet 8 to keep the edge thereof:

abutted against edge aligner 14 or reference edge 14- i and at the same time provide a substantial forward moving force to transport the paper out of the transporter and aligner apparatus'After the paper 8 leaves the transport mechanism and is aligned against the ref-' erence edge 14, the sheet may be transported to any. other utilizing device as for example a collator or sorter. 7

FIG. 3 more clearly illustrates the use of tube type jets 44 extending through openings 42 in the top and bottom restraining means 10 and 12. The tubes are angled to form converging air flows and provide, in the transport region between restraining means lfl and 12 a low pressure or Bernoulli effect which will have the effect of towing the paper in the air flow and not on the restraining means 10 or 12. The configuration shown in FIG. 3 illustrates the use of jets protruding through openings and these jets are supplied from an accumulator or plenum 50 which is in turn supplied with pressurized air from a pump 52.

FIG. 2 illustrates an alternative embodiment wherein the upper and lower restraining means have been formed as part of a plenum chamber 54 which is pressurized by pump 52. The jets are then formed by holes being drilled at the appropriate angular orientation both with respect to the paper path and also slanted in the direction of travel desired by the paper at any one point to cause converging Bernoulli air flows to urge the paper forward.

Particular advantages of this type of system over me- .chanical systems is that the paper is free to overcome the forces of the jets when it engages a rigid alignment member such as the reference edge and not crumple, tear or otherwise mutilate the paper where a mechanical device is in firm physical contact with the page may create tears, wrinkles, or crumpling of the sheet, and resulting paper jams.

An additional reason for utilizing this mechanism over a mechanical device would be its relatively inexpensive construction inasmuch as there are very few moving mechanical parts, primarily confined to the pressure pump. Additionally the positive air flow through jets does not require an air filtering system such as vacuum transports, the type of mechanism which can become contaminated by the entraining of contaminate particles such as dirt or paper dust in the air flow.

While the invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form and details may be made therein without departing from the spirit and scope of the invention.

I claim:

1. A pneumatic sheet transporting and aligning device comprising a transport plane defined by restraining means positioned on two sides of said plane and an edge guide aligning means;

a plurality of nozzles extending through said restraining means and the extensions thereof forming an acute angle with the transport plane;

said plurality of nozzles divided into two groups, one group extending through each restraining means, and each of said groups further subdivided into subgroups of nozzles each having an angular orientation with the edge guide aligning means such that the first said subgroup has the largest angle therebetween and successive ones of said subgroups has a decreasing angular orientation thereby providing a progressively decreasing translating and aligning vector of force on a sheet and an increasing transporting vector of force on said sheet with the sheets progression through said transport and alignment device; said plurality of nozzles pneumatically connected to a pressurized air source to provide continuous air flow therethrough. 2. A pneumatic transport and aligner for transporting sheet material and aligning said sheet with an edge 5 alignment guide comprising:

pneumatic propulsion means for aligning and transporting comprising a plurality of groups of nozzles;

each of said groups of said nozzles angularly oriented with respect to said edge alignment guide to progressively provide a decreasing translating vector and an increasing transporting vector of force on said sheet, with respect to its direction of transportation;

said plurality of nozzles pneumatically connected to I a pressurized air source to provide continuous air flow therethrough.

3. The transport and alignment device of claim 2 wherein said groups of nozzles are positioned and angularly placed with respect to a sheet of said material that in addition to said translating vector and said transporting vector, at least one of said groups of said nozzles is angularly oriented with respect to others of said nozzles and said edge guide, that the cooperative forces of the air flow from said nozzles creates a turning movement about an axis perpendicular to the plane of said sheet.

4. The transport and alignment device of claim 2 wherein the vectors of forces created by the orientation of said nozzles coact on said sheet to rotate said sheet to cause the trailing corner of the aligner engageable edge of said sheet to engage said edge aligner guide prior to the engagement of said edge of said sheet.

Claims (4)

1. A pneumatic sheet transporting and aligning device comprising a transport plane defined by restraining means positioned on two sides of said plane and an edge guide aligning means; a plurality of nozzles extending through said restraining means and the extensions thereof forming an acute angle with the transport plane; said plurality of nozzles divided into two groups, one group extending through each restraining means, and each of said groups further subdivided into subgroups of nozzles each having an angular orientation with the edge guide aligning means such that the first said subgroup has the largest angle therebetween and successive ones of said subgroups has a decreasing angular orientation thereby providing a progressively decreasing translating and aligning vector of force on a sheet and an increasing transporting vector of force on said sheet with the sheets progression through said transport and alignment device; said plurality of nozzles pneumatically connected to a pressurized air source to provide continuous air flow therethrough.
2. A pneumatic transport and aligner for transporting sheet material and aligning said sheet with an edge alignment guide comprising: pneumatic propulsion means for aligning and transporting comprising a plurality of groups of nozzles; each of said groups of said nozzles angularly oriented with respect to said edge alignment guide to progressively provide a decreasing translating vector and an increasing transporting vector of force on said sheet, with respect to its direction of transportation; said plurality of nozzles pneumatically connected to a pressurized air source to provide continuous air flow therethrough.
3. The transport and alignment device of claim 2 wherein said groups of nozzles are positioned and angularly placed with respect to a sheet of said material that in addition to said translating vector and said transporting vector, at least one of said groups of said nozzles is angularly oriented with respect to others of said nozzles and said edge guide, that the cooperative forces of the air flow from said nozzles creates a turning movement about an axis perpendicular to the plane of said sheet.
4. The transport and alignment device of claim 2 wherein the vectors of forces created by the orientation of said nozzles coact on said sheet to rotate said sheet to cause the trailing corner of the aligner engageable edge of said sheet to engage said edge aligner guide prior to the engagement of said edge of said sheet.
US48231074 1974-06-24 1974-06-24 Pneumatic sheet transport and alignment mechanism Expired - Lifetime US3918706A (en)

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US48231074 US3918706A (en) 1974-06-24 1974-06-24 Pneumatic sheet transport and alignment mechanism
GB1577175A GB1461754A (en) 1974-06-24 1975-04-17 Sheet transport mechanism
FR7515092A FR2276644B1 (en) 1974-06-24 1975-05-06
JP5750775A JPS512163A (en) 1974-06-24 1975-05-16 Shiitoyusokenseigosochi
DE19752523986 DE2523986A1 (en) 1974-06-24 1975-05-30 Pneumatic blattransport- and alignment device

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US3984098A (en) * 1975-11-28 1976-10-05 Xerox Corporation Pneumatic registration and clamping apparatus
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US6805318B2 (en) * 2000-05-05 2004-10-19 Peter Ebner Device for guiding a metal strip on a gas cushion
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US6565691B2 (en) 2000-05-16 2003-05-20 Kimberly-Clark Worldwide, Inc. Method and apparatus for forming a lap seam
US6596113B2 (en) 2000-05-16 2003-07-22 Kimberly-Clark Worldwide, Inc. Presentation and bonding of garment side panels
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US7175584B2 (en) 2000-05-16 2007-02-13 Kimberly-Clark Worldwide, Inc. Refastenable bonding of garment side panels
USRE45256E1 (en) 2000-05-16 2014-11-25 Kimberly-Clark Worldwide, Inc. Garment side panel conveyor system and method
US7069970B2 (en) 2000-05-16 2006-07-04 Kimberly-Clark Worldwide, Inc. Apparatus for forming a lap seam
US6846374B2 (en) 2000-05-16 2005-01-25 Kimberly-Clark Worldwide Method and apparatus for making prefastened and refastenable pant with desired waist and hip fit
US7452320B2 (en) 2000-05-16 2008-11-18 Kimberly-Clark Worldwide, Inc. Presentation and bonding of garment side panels
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EP1475326A1 (en) * 2003-05-08 2004-11-10 MASCHINENBAU OPPENWEILER BINDER GmbH & Co. KG Air blast hold down apparatus and sheet alignment apparatus provided therewith
CN100453433C (en) * 2003-05-08 2009-01-21 奥彭魏勒宾德尔机械制造公司 Air blast hold down apparatus and sheet alignment apparatus provided therewith
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US7726649B2 (en) * 2005-06-07 2010-06-01 Xerox Corporation Air drag cooler for sheet transport apparatus
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US8579284B2 (en) * 2012-03-28 2013-11-12 Xerox Corporation Pneumatic sheet registration and clamping
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CN104044362B (en) * 2013-03-12 2019-02-22 施乐公司 Pneumatic type workbench

Also Published As

Publication number Publication date
DE2523986A1 (en) 1976-01-15
JPS512163A (en) 1976-01-09
FR2276644A1 (en) 1976-01-23
GB1461754A (en) 1977-01-19
FR2276644B1 (en) 1977-07-08

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