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Publication numberUS3830419 A
Publication typeGrant
Publication dateAug 20, 1974
Filing dateAug 24, 1973
Priority dateAug 24, 1973
Also published asCA996879A1, DE2420984A1
Publication numberUS 3830419 A, US 3830419A, US-A-3830419, US3830419 A, US3830419A
InventorsC Lee
Original AssigneePako Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tapered roller transport mechanism for web of photographic materials and the like
US 3830419 A
Abstract
The tapered rollers of this web transport mechanism are specifically constructed and arranged to apply driving force to only the marginal edge portions of the web being transported to minimize the possibility of scratching and pressure marking of the central image-bearing sensitized surface of the web and also maintain frictional driving contact without close fitting tolerance between each pair of rollers. The mechanism includes a plurality of pairs of oppositely tapered rollers having opposed surfaces spaced apart a distance slightly greater than the thickness of the web to be transported, the rollers of adjacent pairs being oppositely tapered and arranged to alternately offset the marginal edge portions of the web path defined thereby and produce a zigzag, twisting action on the web to cause the frictional driving pressure to be exerted only on the marginal edge portions of said web and also permit a spacing wider than the web thickness be maintained between each pair of rollers.
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Description  (OCR text may contain errors)

United States Patent [191 Lee 9 v [73] Assignee: Pako Corporation, Minneapolis,

Minn.

22 Filed: Aug. 24, 1973 21 Appl. No.: 391,334

[52] U.S. Cl 226/184, 95/89 A, 226/189 [51] Int. Cl. G031! 3/12 [58] Field of Search 226/118, 184, 189, 17,

[56] References Cited UNITED STATES PATENTS 4/1956 Franklin 226/l84 7/1970 Savela 226/189 X Primary Examiner-Richard A. Schacher Attorney, Agent, or Firm-John W. Adams [111 3,830,419 [451 Aug. 20, 1974 57] ABSTRACT The tapered rollers of this web transport mechanism are specifically constructed and arranged to apply driving force to only the marginal edge portions of the web being transported to minimize the possibility of scratching and pressure marking of the central imagebearing sensitized surface of the web and also maintain frictional driving contact without close fitting tolerance between each pair of rollers. The mechanism includes a plurality of pairs of oppositely tapered rollers having opposed surfaces spaced apart a distance slightly greater than the thickness of the web to be transported, the rollers of adjacent pairs being oppositely tapered and arranged to alternately offset the marginal edge portions of the web path defined thereby and produce a zigzag, twisting action on the web to cause the frictional driving pressure to be exerted only on the marginal edge portions of said web and also permit a spacing wider than the web thickness be maintained between each pair of rollers.

6 Claims, 4 Drawing Figures TAPERED ROLLER TRANSPORT MECHANISM FOR WEB OF PHOTOGRAPHIC MATERIALS AND THE LIKE It has constantly been a problem to provide a transport mechanism for photographic web materials such as film and print paper, to prevent surface scratching and pressure marking of the relatively soft photographic surface being processed by the particular processing equipment through which the transport mechanism carries the web.

It is an object of the present invention to provide a transport mechanism for photographic equipment which is particularly designed to produce roller contact pressure along only the marginal edge portions of the web of photographic material being transported.

It is another object of the present invention to provide a web transport mechanism including pairs of'oppositely tapered rollers spaced apart a distance greater than the thickness of the web being transported and mounted on opposed parallel axes which define the center line of the web path therebetween for simplicity of manufacture and application of driving motion to the rollers, the edges of the web path through adjacent pairs of rollers being offset to produce a zigzag, twisting motion of the web about said center line and thus exert driving pressure on only the marginal edge portions of said web and eliminate roller contact with the central principal image-bearing area of the web.

These and other objects and advantages of this invention will more fully appear in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views, and, in which:

FIG. 1 is a side elevational view of the transport mechanism with the oscillating plate removed;

FIG. 2 is an end elevation of the transport mechanism taken substantially along the line 22 of FIG. 1;

FIG. 3 is a fragmentary horizontal sectional view taken substantially along the line 3-3 of FIG. 2; and,

FIG. 4 is a fragmentary vertical sectional view taken substantially along the line 4-4 of FIG. 2.

The photographic processor which embodies this invention is best shown in FIG. 1 and includes an outer housing or casing designated by the letter C. The particular processor illustrated includes four separate processing tanks respectively designated by the numerals 10, 11, 12 and 13. Tanks 10, 11 and 12 each contain a different liquid used in the processing system and tank 13 defines a drying chamber. The transport mechansim includes a pair of side panels or plates respectively designated by the numerals I4 and 15.

The transport mechanism includes a plurality of pairs of tapered rollers 16. Each roller is mounted for rotation between the plates 14 and 15 on suitable supporting shafts 17 respectively rotating on axes 17a.

Any suitable means for imparting rotary driving motion to the rollers 17 may be provided such as the DRIVING MECHANISM FOR A ROLLER TRANS- PORTING DEVICE disclosed in my U.S. Pat. No. 3,608,807. This mechanism includes a single oscillating plate (not shown herein) to which a plurality of driving pins 18b are fixed. One shaft 17 of each pair of rollers has a crank arm 18a fixed in radially outstanding relation thereto and these crank arms 18a are respectively engaged by the crank pins 18b which in turn are driven by said oscillating plate in the manner set forth in said prior patent. Instead of the two oscillating plates 40 and 42 disclosed in said patent, the present mechanism includes only one such plate which is designed to drive only one ofeach pair of rollers. In the mechanism disclosed herein, the other roller in each pair is driven by a pair of meshed gears 19 respectively fixed to the ends of the shafts l7 opposite to the ends to which the crank arms l8a'are fixed. This is best shown in FIGS. 2 and 3.

As best shown in FIG. 1 the axes of adjacent pairs of rollers are oriented in such a manner to define a continuous web path through the processing tanks 10, ll, 12 and 13. A plurality of rollers 16 are provided which are tapered from one end to the other and the opposed surfaces thereof are spaced apart a distance greater than the thickness of a web W of material to be transported. The direction of taper of one roller in each pair is opposite to the direction of taper of the other roller in that pair as best shown in FIG. 3. The direction of taper of each pair of rollers is opposite to the direction of taper of adjacent pairs of rollers. The web of photographic material W is best shown in FIGS. 3 and 4 which illustrate the zigzag path followed by the marginal edge portions of the web W through the roller train and the photographic processing tanks.

The alternating of the direction of taper of adjacent rollers not only produces the zigzag path of the web as described but also maintains the web in transversely centered relationship along the center line of its desired web path. We have found that an even number of pairs of transport rollers at the curved ends of each loop of the web path serves to maintain the web W in this centered relationship as it passes around the curved portion of the path. It seems to be important that an even number of pairs of rollers are provided for carrying the web through each of the various conditions encountered along the web path to avoid any tendency to cause the web to travel off the center line of the path.

Since the spacing between the rollers of each pair is wider than the thickness of the web being transferred it has been found to be desirable to provide a pair of squeegee rollers 20 at the top of the exit portion of the path in each liquid confining tank. These squeegee rollers 20 are in surface contact and are positioned above the liquid level of each of the liquid tanks, 10, 11 and 12. They are of soft yieldable material and are positioned to press against both sides of the web to squeegee off substantially all of the liquid from the surface of the web W as it is transported out of each tank.

It will be seen that the opposite orientation of adjacent rollers produces an offset of both marginal edge portions of the web thus causing a tensioning of edge portions to provide maximum drive pressure therealong and eliminate the driving contact pressure on the central image-bearing areas of the web. The requirement for close tolerances of the spacing between each pair of rollers 17 has also been eliminated.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of this invention as set forth in the appended claims.

What is claimed is:

1. A transport mechanism for elongated webs of sheet material comprising a roller supporting structure,

a plurality of pairs of tapered transport rollers mounted on said structure, the spacing between the rollers of each pair being greater than the thickness of the web being transported,

the taper of each roller being opposite to its adjacent rollers and said rollers being oriented to produce a zigzag path for the marginal edge portions of a web of material being transported through said rollers, and

means for driving said rollers to produce the movement of such web through the spacing between the respective pairs along the desired web path.

2. The structure set forth in claim I wherein the axes of rotation of the rollers are parallel and define the center line of desired web path therebetween.

3. The structure set forth in claim 2 and said web path having a number of U-shaped loops with an even number of pairs of rollers disposed at the closed curved portion of each loop.

4. The structure set forth in claim 2 and the number of pairs of rollers for all of the respective conditions encountered along the web path being an even number to avoid any tendency of the tapered rollers to move the web off the center line of its desired path.

5. The structure set forth in claim 1 and a number of liquid confining tanks through which the web is transported and a pair of soft yieldable squeegee rollers at the exit end of each tank to remove substantially all of the liquid from the web surfaces.

6. The structure set forth in claim 1 and adjacent pairs of rollers being oriented to produce a web path center portion through which a substantial central image-bearing area of the web is free from contact with said rollers, the web diagonally transversing the width of the space between each pair of rollers with the marginal edge portion of one side of the web in frictional driving contact with a larger portion of one of said rollers and the marginal edge portion of the other side of the web in frictional driving contact with a larger portion of the other roller of each pair.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2742143 *Aug 17, 1953Apr 17, 1956Proctor & Schwartz IncApparatus for handling materials in strand or rope form
US3520461 *Feb 7, 1968Jul 14, 1970Pako CorpDriving device for a series of rollers
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3905534 *Aug 1, 1974Sep 16, 1975Pako CorpPhotographic processing machine with oppositely canted transport roller
US4026451 *Oct 30, 1975May 31, 1977Hope Henry FConveyor apparatus for processing photographic materials
US4326791 *Dec 12, 1980Apr 27, 1982Pako CorporationTransport system for processor of photosensitive web material
US4534499 *Jan 24, 1983Aug 13, 1985Ron CoxWire drive mechanism
US6655567 *Sep 28, 2001Dec 2, 2003Jv Medi Co., Ltd.Power exhaust device for packing sheet used in sharing and packing device of medicine
US7113730 *Jul 2, 2003Sep 26, 2006Samsung Electronics Co., Ltd.Apparatus for preventing developer wraparound in wet electrophotographic printer
US7451583May 29, 2007Nov 18, 2008Jvm Co., Ltd.Automatic medicine packaging machine with door lock unit
US7549268Apr 23, 2007Jun 23, 2009Jvm Co., Ltd.Division-packaging method and apparatus for automatic medicine packaging machine
US7641073Jan 17, 2007Jan 5, 2010Jvm Co., Ltd.Apparatus and method for preventing irregular packaging for automatic medicine packing machine
US7669733Nov 8, 2006Mar 2, 2010Jun Ho KimCassette device for automatic medicine packaging apparatus
US7894656May 29, 2007Feb 22, 2011Jvm Co., LtdMethod and apparatus for inspecting manual dispensing tray of automatic medicine packaging machine
US8239214Jan 26, 2007Aug 7, 2012Jvm Co., Ltd.Method and apparatus for backing up power failure for automatic medicine packing machine
Classifications
U.S. Classification226/184, 226/189
International ClassificationG03D3/08, G03D3/13, B65H20/02, B65H23/26
Cooperative ClassificationG03D3/132, B65H23/26, B65H20/02, B65H2404/147
European ClassificationB65H20/02, B65H23/26, G03D3/13F
Legal Events
DateCodeEventDescription
May 11, 1983ASAssignment
Owner name: CONTINENTAL ILLINOIS NATIONAL BANK AND TRUST COMPA
Owner name: FIRST NATIONAL BANK OF MINNEAPOLIS, FIRST BANK PLA
Owner name: NORTHWESTERN NATIONAL BANK OF MINNEAPOLIS, 7TH STR
Owner name: PRUDENTIAL INSURANCE COMPANY OF AMERICA THE, P.O.
Free format text: MORTGAGE;ASSIGNOR:PAKO CORPORATION A DE CORP.;REEL/FRAME:004126/0659
Effective date: 19820618